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  • 2023.03.06

    What are the principles for the selection of stamping die materials

    Stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products) in cold stamping process, which is called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses the mold installed on the press to exert pressure on the material at room temperature to make it separate or plastic deformation, so as to obtain the required parts.1. Production batch. When the production batch of stamping parts is large, the material of the working parts of the mold, the punch and the die, shall be the die steel with high quality and good wear resistance. The material of other process structure parts and auxiliary structure parts of the mold should also be improved. When the batch size is small, the requirements for material properties are required to reduce costs.2. The performance of the material to be punched and the service conditions of the die parts. When the material to be punched is hard or the deformation resistance is large, the male and female dies of the die shall be made of materials with good wear resistance and high strength. When drawing stainless steel, aluminum bronze concave die can be used because it has good adhesion resistance. The guide post and guide sleeve require wear resistance and good toughness, so the surface carburization and quenching of low carbon steel are often used. For another example, the main disadvantage of carbon tool steel is its poor hardenability. When the section size of die parts is large, its central hardness is still low after quenching. However, when working on a press with a large number of strokes, it becomes an advantage because of its good impact resistance. For parts such as fixed plate and discharge plate, not only should they have sufficient strength, but also they should have small deformation in the working process. In addition, cold treatment and cryogenic treatment, vacuum treatment and surface strengthening can also be used to improve the performance of mold parts. For cold extrusion dies with poor working conditions of male and female dies, select die steel with sufficient hardness, strength, toughness, wear resistance and other comprehensive mechanical properties, as well as certain red hardness and thermal fatigue strength.

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  • 2023.03.03

    Six material selection principles for stamping dies

    The stamping die is also known as the cold die. It uses the press pressure to act on the die to change the shape of the metal placed in the die. From the function of the die, there are drawing die, blanking die, bending die, riveting die, etc. The working principle of the drawing die is to use the convex and concave die of the same shape to press the metal material through the press plate to process various geometric three-dimensional products according to the design requirements.1. Production batchWhen the production batch of stamping parts is large, the materials of the working parts of the die, the punch and the die should be made of die steel with high quality and good wear resistance. The parts materials of other process structure parts and auxiliary structure parts of the mold should also be improved accordingly. When the batch size is small, the requirements for material properties should be appropriately relaxed to reduce costs.2. Reduce production costsPay attention to the use of micro-deformation die steel to reduce machining costs.3. Performance of the stamped material and service conditions of die partsWhen the material to be punched is hard or has large deformation resistance, the punch and die should be made of materials with good wear resistance and high strength. When drawing stainless steel, aluminum bronze concave die can be used because it has good adhesion resistance. The guide post and guide sleeve require wear resistance and good toughness, so the surface carburization and quenching of low carbon steel are often used. For another example, the main disadvantage of carbon tool steel is its poor hardenability. When the section size of die parts is large, its central hardness is still low after quenching. However, when working on a press with a large number of strokes, it becomes an advantage because of its good impact resistance. For parts such as fixed plate and discharge plate, not only should they have sufficient strength, but also they should have small deformation in the working process4. Material propertiesThe cold and hot workability of the material and the existing conditions of the plant shall be considered.5. Considering the production and use of moulds in ChinaThe selection of mold materials should be determined according to the use conditions of mold parts, so as to select low-cost materials and reduce costs on the premise of meeting the main conditions.6. Development of special die steelFor molds with special requirements, mold steel with special properties shall be developed and applied.

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  • 2023.02.21

    Several classification explanations of automobile mold plastics

    In a narrow sense, the automobile mold is the general name of the mold for punching all the stamping parts on the automobile body. That is, "automobile body stamping die". For example, the top cover flanging die, the beam reinforcement plate pressing die, etc. The most important component of automobile mold is the panel mold. This type of die is mainly cold stamping die. In a broad sense, "automobile mold" is the general name of the mold for manufacturing all parts of the automobile. For example, stamping mould, injection mould, forging mould, casting wax mould, glass mould, etc.1. Compression moldThe molding process of the compression mold is characterized by adding plastic raw materials directly into the open mold cavity, and then closing the mold. After the plastic is in the melting state under the action of heat and pressure, the cavity is filled with a certain pressure. At this time, the molecular structure of the plastic undergoes a chemical crosslinking reaction and gradually hardens and sets. Compression molds are mostly used for thermosetting plastics, and their molding parts are mostly used for the shell of electrical switches and daily necessities.2. Injection moldThe molding process of the injection mold is characterized by placing the plastic raw materials in the heating barrel of the injection machine. The plastic is heated and melted, and pushed by the screw or plunger of the injection machine, enters the mold cavity through the nozzle and the mold pouring system. The plastic is solidified in the mold cavity through pressure maintaining and cooling.Because the heating and pressure device can play its role in stages, injection molding can not only form plastic parts with complex shapes, but also have high production efficiency and good quality. Therefore, injection molding accounts for a large proportion of plastic parts molding, and injection mold accounts for more than half of plastic molding mold. The injection machine is mainly used for the molding of thermoplastics. In recent years, it is also gradually used for the molding of thermosetting plastics.3. Extrusion dieExtrusion die can continuously produce plastic with the same section shape, such as plastic pipe, bar, sheet, etc. The heating and pressure device of the extruder is the same as that of the injection machine. The molten plastic will form continuous molded plastic parts after passing through the machine head, and the production efficiency is particularly high.In addition to the plastic molds listed above, there are vacuum molding mold, compressed air mold, blow molding mold, low foaming plastic mold, etc.4. Transfer modeTransfer mold, also known as injection mold or extrusion mold, its molding process features that plastic raw materials are added to the preheated charging chamber, and then the pressure is applied to the plastic raw materials in the charging chamber by the pressure column. The plastic is melted under high temperature and pressure, and enters the mold cavity through the pouring system of the mold, and then undergoes chemical cross-linking reaction and gradually solidified. Transfer molding technology is mostly used for thermosetting plastics, which can form plastic parts with complex shapes.

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  • 2023.02.16

    Factors affecting the service life of cold stamping die steel

    Stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products) in cold stamping process, which is called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses the mold installed on the press to exert pressure on the material at room temperature to make it separate or plastic deformation, so as to obtain the required parts.abrasionThe wear caused by frequent friction between the convex and concave dies of cold stamping dies and the processed materials for a long time. Due to the long time friction between the convex and concave dies and the processed materials, the large number of parts processed for a long time, the excessive burr (excessive gap) of the blanking parts, and the small gap between the convex and concave dies are all important reasons for the wear of the convex and concave die blade. For example, the convex and concave die edges become blunt, and the edges and corners become rounded.deformationThe convex and concave dies of the cold stamping die have shape deformation during use, which changes the geometric shape of the processed product parts, thus affecting the dimensional accuracy and shape requirements of the processed parts. This is the opposite of the fracture situation. The main reason is that the quenching hardness of the convex and concave dies is not enough or the quenching hardness layer is too shallow during the heat treatment process, which causes the geometric deformation of the convex and concave dies during the stress process.crackThe sudden damage, fracture and crack of the convex and concave dies of the cold stamping die in the process of use. Because the convex and concave dies of the die are the parts of the die that bear a lot of punching pressure during the stamping process, the convex and concave dies of the die will break during the stamping process. The main reasons are: improper heat treatment processing (too hard quenching or too deep hardness layer), too small design gap, etc. will cause the damage, fracture and fracture of the convex and concave dies of the die. Some of the broken dies and dies are locally damaged, and we can continue to use them after repair. Some of the broken dies and dies are relatively large or completely damaged and cannot be repaired. We have to configure new dies or dies according to the drawing design before use.GnawThe adjustment and assembly of the gap between the male and female dies of the cold stamping die is uneven, and the adjacent edges of the male and female dies bite each other, causing the edge of the male and female dies to bite. For example, in the process of die assembly, the position of the male and female die is offset and the gap is uneven. When installing the die without guide, the gap between the male and female die is not adjusted properly, and the male and female die bite each other.

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  • 2023.02.10

    Brief introduction to the classification of four kinds of automobile moulds

    In a narrow sense, the automobile mold is the general name of the mold for punching all the stamping parts on the automobile body. That is, "automobile body stamping die". For example, the top cover flanging die, the beam reinforcement plate pressing die, etc.1. Extrusion dieExtrusion die head is also called extrusion die head. This mold can continuously produce plastic with the same section shape, such as plastic pipe, bar, sheet, etc. The heating and pressure device of the extruder is the same as that of the injection molding machine. The molten plastic will form continuous plastic parts after passing through the die head, and the production efficiency is particularly high.In addition to the plastic molds listed above, there are vacuum molding molds, compressed air molds, blow molding molds, low foaming plastic molds, and so on.Stamping parts on the body are generally divided into covering parts, beam frame parts and general stamping parts. The stamping parts that can clearly show the image characteristics of the car are the car cover parts. Therefore, a more specific automobile die can be said to be "automobile panel stamping die". Stamping die for automobile panel. For example, the front door outer panel trimming die, the front door inner panel punching die, etc.2. Injection moldInjection mold is also called injection mold. The molding process of the mold is characterized by putting plastic raw materials into the heating cylinder of the injection molding machine. The plastic is heated and melted, pushed by the screw or plunger of the injection molding machine, and enters the mold cavity through the nozzle and pouring system of the mold. After heat preservation, pressure maintaining and cooling, the plastic is solidified in the mold cavity. Because the heating and pressure device can play its role in stages, injection molding can not only form plastic parts with complex shapes, but also have high production efficiency and good quality. Therefore, injection molding accounts for a large proportion in the molding of plastic parts, and injection mold accounts for more than half of the plastic molding mold. The injection molding machine is mainly used for the molding of thermoplastics. In recent years, it is also gradually used for the molding of thermosetting plastics.3. DieThe press mold is also called the press mold or the press rubber mold. The molding process of the mold is characterized by adding plastic raw materials directly into the open mold cavity, and then closing the mold. After the plastic melts under the action of heat and pressure, the mold cavity is filled with certain pressure. At this time, the molecular structure of the plastic undergoes chemical cross-linking reaction and gradually hardens and forms. Compression molds are mostly used for thermosetting plastics, and molded plastic parts are mostly used for the shells of electrical switches and daily necessities.4. Transmission moduleTransfer mold is also called injection mold or extrusion mold. The molding process of the mold is characterized by adding plastic raw materials into the preheated feed chamber, and then applying pressure to the plastic raw materials in the feed chamber through the pressure column. The plastic melts under high temperature and pressure, enters the mold cavity through the pouring system of the mold, and then undergoes chemical cross-linking reaction, and gradually solidified. The transfer process is mainly used for thermosetting plastics and can be used to form plastic parts with complex shapes.

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  • 2023.02.03

    Failure Analysis and Solution of Stamping Die

    Stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products) in cold stamping process, which is called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses the mold installed on the press to exert pressure on the material at room temperature to make it separate or plastic deformation, so as to obtain the required parts.1. Die damage:Mold damage refers to mold cracking, fracture, expansion, etc. In order to deal with mold damage, we must find out the causes from mold design, manufacturing process, mold use and other aspects. First of all, check whether the mold manufacturing materials are suitable and whether the corresponding heat treatment process is reasonable. Generally speaking, the heat treatment process of die material has a great impact on it. If the quenching temperature of the die is too high, the quenching method and time are unreasonable, the tempering times and temperature and the selection between elbows are improper, the die will be damaged after entering the stamping production. Improper design of the size or depth of the blanking hole can easily block the slot hole and damage the blanking plate. If the spring force is too small or the contour sleeve is not equal to the contour, the spring will break and the blanking plate will tilt, resulting in overlapping punching and damage to the parts.Improper fixing of the punch or insufficient screw strength may cause the punch to fall or break.When using the mold, the installation position and direction of the parts are incorrect, or the bolts are not tightened correctly. The working height is adjusted too low, and the guide post is not lubricated enough. Feed equipment failure, abnormal pressure, etc., It will cause damage to the mold. If foreign matters enter the mold, parts overlap, waste blocking and other conditions are not handled in time, and the processing and production continue, it is easy to damage the blanking plate, punch, lower template and guide post of the mold.2. Death:In the stamping process, once the clamping is not flexible or even stuck, the production must be stopped immediately to find out the cause of the stuck die and eliminate the fault. Otherwise, the fault will expand and cause chip damage.The main causes of mold sticking are: poor guide mold and inclination. Or there are foreign matters between the formwork, which makes the formwork unable to be flattened; The design of die strength is insufficient or the stress is uneven. Cause mold deformation, such as the design of hardness and thickness of mold base and template is too small, which is easy to be impacted and deformed by external forces; The mould position is not installed correctly, and the positioning error of the upper and lower moulds is out of tolerance. Or the precision of the press is too poor, resulting in mold interference; The punch strength is not enough, and the position of the big punch and the small punch is too close, which makes the lateral force of the die unbalanced. At this time, the punch strength should be improved and the guide protection of the discharge plate should be strengthened.Mold damage and maintenance:The cost of stamping die is very high. Generally speaking, mold cost accounts for 1/5-1/4 of the total cost of parts. This is because, in addition to the difficulty and high cost of mold manufacturing. After putting into production, the cost of mold repair and grinding maintenance is also very high, and the original cost of mold only accounts for about 40% of the total cost of mold. Therefore, timely maintenance of the die and prevention of die damage can greatly reduce the die cost of stamping production.Generally speaking, there are maintenance and scrapping problems after the mold is damaged. Non-natural wear failure of stamping die, such as damage of non-key parts. However, the small punch fracture, punch upsetting shortening, die cracking, blanking edge cracking and other failures can be completely restored to normal status through maintenance and put into stamping production again. But when the key parts of the die are seriously damaged, sometimes the punch and the die are damaged at the same time. The one-time maintenance cost exceeds 70% of the original cost of the mold, or the service life of the mold is close. Maintenance is of little significance. At this time, it is necessary to consider scrapping molds: except for large molds and continuous molds with complex structures. When the mold maintenance process is too complex, the mold maintenance cost is too high, the difficulty is too high, and the maintenance cycle is too long, which will seriously affect the normal production of stamping parts. We should choose to expire in advance, scrap and remanufacture the mould.

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  • 2023.01.28

    Four Materials in the Selection of Stamping Die

    Stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products) in cold stamping process, which is called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses the mold installed on the press to exert pressure on the material at room temperature to make it separate or plastic deformation, so as to obtain the required parts. How to select materials for stamping dies?1. Low-alloy tool steelLow-alloy tool steel is based on carbon tool steel and added with appropriate alloying elements. Compared with carbon tool steel, it reduces the cracking tendency and quenching deformation, improves the hardenability of steel, and has better wear resistance. Low-alloy steels used for mold manufacturing include CrWMn, 9Mn2V, 7CrSiMnMoV (code CH-1), 6CrNiSiMnMoV (code GD), etc.2. Carbon tool steelT8A, T10A, etc. It is widely used in moulds and has the advantages of good processing performance and low price. However, the hardenability and red hardness are poor, the heat treatment deformation is large, and the bearing capacity is low.3. High speed steelIt has the highest hardness, wear resistance and compressive strength in high-speed steel die steel, and has high bearing capacity. W18Cr4V (code 8-4-1), W6Mo5Cr4V2 (code 6-5-4-2, American brand M2) and high speed steel 6W6Mo5Cr4V (code 6W6 or low carbon M2) with less tungsten content are commonly used in moulds. High speed steel also needs to be forged to improve its carbide distribution.4. High carbon medium chromium tool steelHigh carbon medium chromium tool steel for mould includes Cr4W2MoV, Cr6WV, Cr5MoV, etc. They have low chromium content, few eutectic carbides, uniform distribution of carbides, small heat treatment deformation, and good hardenability and dimensional stability. Compared with high carbon and high chromium steel with relatively serious carbide segregation, its properties are improved.

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  • 2023.01.17

    What are the key points for the maintenance of continuous stamping die

    Continuous die refers to the cold stamping die in which the press uses strip stamping raw materials to complete multiple stamping processes at the same time with several different stations on a pair of die in one stamping stroke. The strip moves at a fixed distance once after each stamping of the die, until the product is completed.1. Maintenance of punch and dieWhen disassembling the punch, pay attention to the original condition of the die so that it can be easily recovered in the subsequent die assembly process. If there is a gasket or displacement, the thickness of the gasket shall be engraved on the part and recorded.When replacing the punch, try to insert the demoulding module to see if the female mold is smooth, and try to evenly insert the gap between the female mold and the female mold; When replacing the female die, test whether the gap between the insert and the punch is even.In view of the shortening of the punch after grinding, it is necessary to add pads to meet the required length, and check whether the effective length of the punch is sufficient. It is necessary to find out the reason for replacing the punch, and check whether the corresponding concave die has broken edges and needs edge grinding.When assembling the punch, check whether there is enough clearance between the punch and the fixed block or plate. If there is a pressing block, check whether there is active margin. When assembling the female mold, first place it horizontally, then place a flat iron block on the surface of the female mold, and knock it in place with a copper bar. Do not tilt and force it, and chamfer the bottom of the female mold. After installation, check whether the mold surface is flush with the mold surface.After the assembly of punch, die and die core, check the protective belt to see whether all parts are installed incorrectly or upside down, check whether the die and die pad are installed upside down, whether the blanking hole is blocked, whether the newly replaced parts need to steal materials, whether the stealing is sufficient, and whether the parts that need to be locked are locked.Pay attention to the locking confirmation of the release screw. When locking, the cross locking shall be applied evenly from the inside to the outside. Do not lock one screw first and then the other screw, so as not to cause the formwork to fall off and tilt, causing the punch to break or the die precision to drop.2. Maintenance of formwork removalTo remove the template, first pry it up with two screwdrivers, and then balance it with both hands. When it is difficult to disassemble, check whether the mold is clean, whether the locking screws are all disassembled, and whether the mold is damaged due to sticking. Find out the cause and deal with it accordingly. Don't deal with it blindly.When assembling the demoulding, first clean the punch and demoulding, add lubricating oil to the guide column and the guide of the punch, and then put them in place smoothly, then press them in place with both hands, and repeat several times. If it is too tight, find out the cause (whether the guide post and guide sleeve are guided normally, whether there is damage to each part, whether the newly replaced punch can pass smoothly, and whether the template removal is correctly positioned), find out the cause, and then carry out corresponding treatment.If there are pressing blocks on the fixed plate, check whether there is enough space for stripping the back plate. The material contact surface between the demoulding and the concave die is pressed for a long time to produce an indentation. When the indentation is serious, it will affect the pressing accuracy of the material, resulting in abnormal instability of the product size, etc. The stripper insert and stripper plate should be repaired or reground.The accuracy of the contour sleeve should be checked. If the contour is not equal, it will cause the formwork to tilt, and damage its precise guidance and stable elastic compression function, which should be maintained.3. Inspection of guide partsCheck the fit clearance between the guide post and the guide sleeve, whether there are burns or wear marks, and whether the oil inlet state of the mold guide rail is normal. The wear of the guide parts and the damage of the precision reduce the precision of the mold. The mold parts will have problems. They must be properly maintained and replaced regularly.Check the accuracy of the material guide. If the guide pin is worn, it will lose the accuracy and function of the belt guide and must be replaced. Check the condition of release spring and ejecting spring to see if they are broken, or if they have been used for a long time but have lost their original strength due to fatigue, they must be regularly maintained and replaced, otherwise the mold will be damaged or the production will not be smooth.4. Adjustment of die clearanceThe die positioning hole is worn due to frequent assembly of die cores, resulting in large gap after assembly (loose after assembly), or uneven gap (positioning deviation), which will lead to poor section shape after punching, easy fracture of punch, burr, etc. Proper clearance adjustment can be made by checking the cross section after stamping.Small, small section, large clearance, large section, large burr, reasonable clearance can be obtained through displacement, and appropriate records shall be made after adjustment, or marks shall be made on the edge of the mold for subsequent maintenance operations.

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  • 2023.01.13

    Introduction of four main maintenance points of continuous stamping die

    Continuous die refers to the cold stamping die in which the press uses strip stamping raw materials to complete multiple stamping processes at the same time with several different stations on a pair of die in one stamping stroke. The strip moves at a fixed distance once after each stamping of the die, until the product is completed.1. Maintenance of punch and dieWhen disassembling the punch, pay attention to the original state of the die, so as to facilitate the recovery during subsequent die installation. If there is a gasket or displacement, the thickness of the gasket shall be engraved on the part and recorded. When replacing the punch, try to insert the demoulding die smoothly, try to find out whether the gap between the insert and the die is even, and try to find out whether the gap between the insert and the punch is even when replacing the die.In view of the fact that the punch becomes shorter after grinding, when the gasket reaches the required length, it is necessary to check whether the effective length of the punch is sufficient. Replace the broken punch, find out the cause, and check whether the corresponding female die has broken edges and needs edge grinding. When assembling the punch, check whether there is enough clearance between the punch and the fixed block or fixed plate. If there is a pressing block, check whether there is movement allowance. The assembly mould shall be placed horizontally, and then placed with a flat iron block. If a copper bar is used to knock the mould surface in place, the bottom of the mould shall be chamfered. After installation, check whether the mold surface is flush with the mold surface. After the assembly of the male mold and the female mold core, it is necessary to check the protective belt, whether all parts are installed incorrectly or reversely, whether the female mold and the female mold pad are installed reversely, whether the blanking hole is blocked, whether the newly replaced parts need to steal materials, whether the stealing materials are sufficient, and whether the parts that need to be locked are locked.Pay attention to the locking confirmation of the release screw. When locking, the cross locking shall be from the inside to the outside with balanced force. Do not lock one screw first and then the other screw, so as not to cause the formwork to fall off and tilt, causing the punch to break or the die precision to drop.2. Maintenance of formwork removalYou can use two screwdrivers to pry up the formwork evenly, and then use both hands to balance it out. When it is difficult to disassemble, check whether the mold is clean, whether the locking screws are all disassembled, and whether the mold damage caused by the material shadow should be blocked. After finding out the cause, carry out the corresponding treatment. Do not handle blindly. When assembling the demoulding, first clean the punch and demoulding, add lubricating oil to the guide column and the guide of the punch, and then put them in place smoothly, then press them in place with both hands, and repeat several times. If it is too tight, find out the cause (whether the guide pillar and guide sleeve guide are normal, whether each part is damaged, whether the newly replaced punch can smoothly pass the template removal, and whether the position is correct), and then make corresponding treatment. If there are pressing blocks on the fixed plate, check whether there is enough space for stripping the back plate. The material contact surface between the demoulding and the concave die is pressed for a long time to produce an indentation. When the indentation is serious, it will affect the pressing accuracy of the material and cause the product size to be abnormally unstable. The stripper insert and stripper plate need to be repaired or reground. The accuracy of the contour sleeve should be checked. If the profile is not equal, the template will tilt, and its precision guidance and stable spring function will be damaged, which should be maintained.3. Inspection of guide partsCheck the fit clearance between the guide post and the guide sleeve, whether there are burns or wear marks, and whether the oil supply status of the mold guide rail is normal. The wear of the guide parts and the damage of the precision reduce the precision of the mold. The mold parts will have problems. They must be properly maintained and replaced regularly. Check the accuracy of the material guide. If the guide pin is worn, it will lose the accuracy and function of the belt guide and must be replaced. Check the condition of release spring and ejector spring to see if they are broken or not broken after long-term use, but they have lost their original strength due to fatigue, so they must be regularly maintained and replaced, otherwise they will cause damage to the mold or make the production not smooth.4. Adjustment of die clearanceThe die positioning hole is worn due to frequent assembly of die cores, resulting in large gap (loose after assembly) or uneven gap (positioning deviation) after assembly, which will lead to poor section shape after punching, and the punch is easy to break, burr, etc. Proper clearance adjustment can be made by checking the cross section after stamping. Small, small section, large clearance, large section, large burr, reasonable clearance can be obtained through displacement, and appropriate records shall be made after adjustment, or marks shall be made on the edge of the mold., It is used for subsequent maintenance operations. In daily production, when the mold is in good condition, attention should be paid to collecting and preserving the original material belt. If the subsequent production is not smooth or the mold is changed, it can be used as a reference for mold maintenance. In addition, check and maintain the wear of the ejector pin and other auxiliary systems, whether the ejector pin can eject materials, and whether the guide pin and bushing are worn.

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  • 2023.01.07

    What are the applications of various continuous mold belt materials

    Continuous molds are various molds and tools used in industrial production for injection molding, blow molding, extrusion, die-casting, forging, smelting, stamping and other methods to obtain products. It mainly realizes the processing of the shape of the article through the change of the physical state of the formed material. Known as the "Mother of Industry". Widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, and compression molding or injection molding of engineering plastics, rubber, ceramics and other products.1. Single-side belt type:Widely used in connector terminals and small stamping parts.2. Double-sided feeding type:It is mainly suitable for relatively complex features, high bending height, wide material width, easy to be deformed in the process of belt conveying, and relatively large stamping parts. For those who cannot be conveyed by one-side belt, double-side belt material can be selected. Mode.3. Double belt type:The double-side belt type is mainly evolved from the double-side material belt type, and the purpose is also to save material. When using double-side material belts, two-side material belts are required. For example, if you add a side-by-side material belt, Then the material of a strip can be saved. This design can also produce different stamping products, but the stamping products must have the same demand quantity at the same time. This is not the case when arranging the same stamped products.4. Double independent belt type:Double independent strips are generally designed for material saving, and the two stamping products are arranged opposite to each other to achieve the purpose of material saving. It is also possible to arrange two different stamping products on each side for stamping at the same time. For example, when stamping different products, the stamped products must have the same required quantity at the same time. This is not the case when arranging the same stamped products.5. Middle belt type:It is mainly suitable for products with lower size requirements and lower stamping precision. Using this design method can generally improve the material utilization rate, but the relative stamping accuracy and stamping speed are relatively poor, so it is generally not recommended to use this mode design.

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  • 2022.12.30

    What are the application forms of various continuous die strip

    Continuous molds are various molds and tools used in industrial production to obtain products by injection molding, blow molding, extrusion, die-casting, forging molding, smelting, stamping and other methods. It mainly realizes the processing of article shape by changing the physical state of the formed materials. It is known as the "Mother of Industry". It is widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, and plastic or injection molding of engineering plastics, rubber, ceramics and other products.1. Single side belt type:Widely used in connector terminals, small stamping parts.2. Double side feeding type:It is mainly applicable to large stamping parts with complex features, high bending height, wide material width, and easy deformation in the process of belt conveying. If it can not be conveyed by single side belt, double side belt can be selected.3. Double belt type:The double belt type is mainly evolved from the double side belt type, which is also designed to save materials. When the double side belt type is used, two side belts are required to carry materials. If a side by side belt is added, the materials of one belt can be saved. This design can also produce different stamping products, but the stamping products need to have the same quantity at the same time. This restriction is not applicable to the arrangement of the same stamping products.4. Double independent belt type:The double independent material belt is generally designed to save materials. Two stamping products are arranged in pairs to save materials. Two different stamping products can also be pressed at the same time on one side of each row. For example, when stamping different products, the stamping products must have the same quantity required at the same time. This restriction is not applicable to the arrangement of the same stamping products.5. Intermediate belt type:It is mainly applicable to products with low size requirements and stamping accuracy. This design method can generally improve the utilization rate of materials, but the stamping accuracy and stamping speed are relatively poor. It is generally not recommended to use this design mode.

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  • 2022.12.22

    What should be paid attention to when designing a continuous mold

    The continuous die refers to the cold stamping die in which the press uses ribbon stamping raw materials in one stamping stroke, and uses several different stations on a pair of dies to complete multiple stamping processes at the same time. Each time the die is punched, the strip moves at a fixed distance until the product is completed.Continuous die1. Reasonably determine the number of working steps: the number of working steps of the continuous die is equal to the sum of the single decomposition process. For example, the number of working steps of the punching descending continuous die is usually equal to the sum of the two single processes of punching and descending. However, in order to improve the strength of the stamping die and facilitate the installation of the punch, sometimes several steps can be completed according to the number of inner holes. The principle for determining the number of working steps is that the less the number of working steps is, the better. The fewer the number of working steps is, the smaller the cumulative error is, and the higher the dimensional accuracy of the punching workpiece is without affecting the strength of the die.2. When arranging the sequence of punching and blanking processes, the punching process should be put in the front, which can not only ensure the direct transportation of materials, but also use the punching as the guide positioning hole to improve the accuracy of the workpiece. However, when it is associated with some bending dimensions or protruding parts, the punching position shall be determined according to the actual situation.3. In the workpiece without round hole, in order to improve the accuracy of feeding step, the process hole can be designed in the first step of the female die, so that the process hole can be used as a guide to improve the accuracy of the stamping part. However, in the current mold design, we have gradually or completely adopted the outer frame guide belt. This is conducive to ensuring the machining accuracy of complex workpieces.4. For different holes with the same size and high accuracy requirements, the same step of forming shall be arranged without affecting the strength of the die.5. Steps with higher dimensional accuracy requirements should be arranged in the last process as far as possible, while steps with lower accuracy requirements should be arranged in the previous process, because the higher the step, the greater the cumulative error.6. In a multi-step continuous mold, the steps of table punching, cutting, grooving, bending, forming, cutting, etc. should generally be arranged in the order of the separation process of punching, cutting, grooving, etc. in the first place, then the bending, drawing and forming process, and finally the cutting and unloading process.7. When flushing porous processes with different shapes and sizes, try not to put large holes and small holes in the same step at the same time to ensure the accuracy of hole spacing during mold repair.8. In the design, if the forming and blanking are completed on the same die, the forming punch and blanking punch shall be fixed separately, and the surface shall not be fixed on the same fixed plate. Try to fix the forming punch on the stripper. The backplane is mounted at the rear.9. In the design, the forming part of each step must be kept on the same feeding line without damage.10. For the die with many process steps and bending steps, the cutting edge of the female die shall be in the block structure as far as possible to achieve rapid replacement and grinding.11. For the fixing method of punch, when realizing continuous punching, the fixing method of hanging platform and counter pressing block shall be adopted to ensure that the punch will not fall off and damage the mold during continuous punching.12. If the die structure strength and position allow. Floating guide pins shall be used for multi-step dies as far as possible.13. Interface form of cutting boundary. In the continuous die, the inexperienced person often cleans the interface. I suggest using a semicircular incision.14. The round hole with the product as the reference hole shall be cut synchronously with the pilot hole. If the edge distance of the round hole is small and the hole size is required, the shape shall be cut before punching.

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