News- Suzhou Wellhong Electric Co., Ltd.

2022.12.16

How to Select Material for Stamping Die Economically and Effectively

Stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products) in cold stamping processing, which is called cold stamping die (commonly known as cold stamping die). Stamping is a kind of pressure processing method to obtain the required parts by applying pressure on the materials with the die installed on the press at room temperature to cause separation or plastic deformation.The modernization of mold design and manufacturing is the basis for the development of mold industry. With the development of science and technology, computer technology, information technology, automation technology and other advanced technologies continue to penetrate, intersect and integrate with traditional manufacturing technologies, and transform into advanced manufacturing technologies.Reasonable selection of die materials and correct heat treatment process are the key to ensure the life of the die. For molds for different purposes, comprehensive consideration shall be given to their working conditions, stress conditions, processing material properties, production batches and productivity., Emphasize the above requirements, and then select the steel type and heat treatment process accordingly.When the production batch of stamping parts is large, the punch and die materials of the working parts of the die should be die steel with high quality and good wear resistance. The materials of other process structural parts and auxiliary structural parts of the die shall also be improved accordingly. When the batch size is small, the requirements for material properties should be appropriately relaxed to reduce costs.Stamping die uses various metal and non-metallic materials, mainly including carbon steel, alloy steel, cast iron, cast steel, hard alloy, low melting point alloy, zinc base alloy, aluminum bronze, synthetic resin, polyurethane rubber, plastic, birch laminate, etc.The materials used for making moulds shall be of high hardness, high strength, high wear resistance, appropriate toughness, high hardenability, no deformation (or small deformation) after heat treatment, no cracking during quenching, etc.When the material to be punched is hard or has large deformation resistance, the punch and die of the die shall be made of materials with good wear resistance and high strength. When drawing stainless steel, aluminum bronze master die can be used because of its good adhesion resistance. However, the guide post and guide sleeve require wear resistance and good toughness, so the surface carburizing and quenching of low carbon steel are often used.Another example is that the main defect of carbon tool steel is poor hardenability. When the cross section size of a die part 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 due to its good impact resistance. For the fixed plate and unloading plate parts, not only should they have sufficient strength, but also the deformation should be small 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 die parts. For cold extrusion dies with poor working conditions of male and female dies, die steel with sufficient hardness, strength, toughness, wear resistance and other comprehensive mechanical properties shall be selected, and at the same time, it shall have certain red hardness and thermal fatigue strength.
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2022.12.09

ow many automobile die characteristics do you know

In recent years, the rapid development of China's automobile industry has greatly driven the development of the automobile die industry. Because the automobile die is a technical product and a typical customized product, especially the technology content of the automobile panel die is very high.How to improve production efficiency, shorten development cycle, improve mold technology, reduce production costs has been a difficult problem for mold enterprises.Some new features in the mold manufacturing process:1. Parallel production organizationAt present, concurrent engineering is widely used in mold production organization. Generally, the process of technical preparation, production preparation, mold processing and debugging in the mold development process should be parallel as much as possible, that is, production preparation, processing technology and NC program design should be parallel.The production plan must first arrange drawing and forming dies, then flanging and molding dies, then trimming and punching dies, and finally blanking and punching dies. Only in this way can we achieve balanced production and provide automobile factories with samples in advance2. NC machining of solid typeAt present, mold manufacturers are basically using the real type manufacturing process. The NC machining production of the solid model is completed through the process editing of the solid model (such as the machining allowance of the machining surface, the layered editing of the model, etc.), followed by NC programming, foam blank blanking, NC processing, manual bonding and trimming.Thus, the production staff of the real mold has changed from manual production to a large number of numerical control programming. The simple manual bonding and finishing work on the site is performed by temporary workers. The numerical control production of the real mold directly improves the precision of the casting, bringing great advantages for the subsequent fine processing.
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2022.12.02

Introduce the manufacturing method of thick continuous stamping die

Stamping forming process is a processing method of forming workpieces with required shape, size and performance by applying external force to plates, pipes, etc. fixed in the mold by the press to make them deform or separate.Stamping process is characterized by fast speed and large batch. Stamping die is used for stamping. In high-speed batch production, the structure and precision of stamping die can directly affect the quality and production efficiency of stamping parts.In the prior art, due to the strong specificity of the stamping die, when the product structure is relatively complex and multiple processes such as blanking, drawing and bending are required, different dies are often used to achieve the corresponding processes; This requires the development of multiple sets of molds, which leads to the lack of close connection between processes and reduces production efficiency.In view of the shortcomings of the prior art, the utility model aims to provide a thick material continuous stamping die, which has high production efficiency of completing multiple processes in a stamping process.To achieve the above purposes, the utility model provides the following technical solutions:A thick continuous stamping die comprises an upper die base and a lower die base; The upper mold base is fixedly connected with an upper base plate, and the upper base plate is fixedly connected with an upper splint; The lower mold base is fixedly connected with a lower base plate; The utility model is characterized in that: the utility model also comprises a middle template;The middle template is connected with the upper splint through a contour sleeve assembly, and an elastic member that abuts the middle template is fixed on the upper template seat; A number of stripper plates are fixedly connected to the middle template, and a number of punch components penetrating the middle template and stripper plates are fixed on the upper clamping plate; The lower base plate is fixedly connected with a lower template equal to the stripper plate; When the mold is closed, the stripper plate and the lower template press the metal strip tightly.In this way, the upper clamping plate is used to fix the punch assembly, and the setting of the upper and lower base plates makes the force of the middle template, stripper plate and lower template more uniform during the stamping process;When the die is closed, the punch components threaded on each stripper plate complete different stamping processes for metal strips at the same time; The elastic part is arranged so that the middle template is separated from the upper clamping plate when opening the mold, so that the stripper plate scrapes the metal strip off the punch assembly; So as to improve the production efficiency.Further setting: the punch component comprises a punching punch and a drawing punch; The lower template is provided with a blanking hole for the punching punch to pass through, the lower template is provided with a female die entry block, and the female die entry block is provided with a forming hole for the drawing punch to extend into.In this way, the punching punch and the drawing punch are set to punch and extrude the metal strip in one stamping process, thus improving the processing efficiency.
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2022.11.25

What are the differences between standard parts and non-standard parts of automobile dies

The standard parts of automobile dies refer to the general name of metal parts used in stamping dies, plastic molds or FA automation equipment exclusively in the die industry.Mold accessories are widely used in various types of plastic molds, stamping molds, automotive, electrical and aviation manufacturing fields.1. Mold non-standard partsNon standard parts of moulds generally refer to the moulds with different specifications and shapes and structures relative to standard moulds. Generally speaking, non-standard mold parts are processed by suppliers according to drawings and requirements provided by customers; The mold accessories stand out in the hardware accessories because of their high precision requirements and high quality requirements. All mold accessories have very high requirements for their industrial and technical equipment, and the non-standard mold degree is up to 0.001 mm tolerance.2. Mold standard partsGenerally speaking, the mold standard parts are standardized, unnecessary and popular. The standard parts can be subdivided into plastic mold accessories, metal punch mold accessories and automatic machinery accessories.Hardware die accessories include: H-type straight body punch, A-type secondary punch, edge forming punch, K-type budding punch, B-type guide punch, A-type punch, punch, die, bushing, high-speed steel round bar, ultra-fine tungsten steel round bar, powder high-speed steel round bar, floating pin, floating material pin, stop screw, locating pin (fixed pin), contour sleeve, guide post, guide sleeve, grade chrome plated guide post, grade copper titanium alloy guide sleeve, self-lubricating guide sleeve Inner guide pillar assembly, sliding guide pillar assembly for mold base, ball guide pillar assembly for mold base, detachable ball guide pillar assembly, outer guide pillar assembly, guide pillar, hexagon screw, contour screw, etc.
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2022.11.18

What are the requirements for processing accuracy of automobile dies

In a narrow sense, the automobile die is the general name of the die for punching all the stamping parts on the automobile body, that is, the "automobile body stamping die", for example, the flanging die for the top cover, the pressing die for the beam reinforcement plate, etc.Now let's listen to the analysis of automobile mold processing factory. What are the requirements for automobile mold processing accuracy?The manufacturing accuracy of die size shall be within 0.005~0.02mm; The perpendicularity shall be within the range of 0.01~0.02mm; Coaxiality shall be within 0.01~0.03mm; The parallelism of the upper and lower planes of the movable and fixed mold parting surfaces shall be within the range of 0.01~0.03mm.After the mold is closed, the gap between parting surfaces shall be less than the overflow value of the formed plastic, and the parallelism of other template mating surfaces shall be within the range of 0.01~0.02mm; The fitting accuracy of the fixed part is generally within the range of 0.01~0.02mm;If the small core has no requirements for insertion or has little impact on the size, a clearance fit of 0.01~0.02mm on both sides can be adopted; The fitting accuracy of sliding part is generally H7/e6, H7/f7 and H7/g6.Note: If there is an insert on the mirror surface that is attached to a step, the fitting should not be too tight, otherwise, when the insert is knocked back from the front, the tool used for knocking is easy to damage the mirror surface. If it does not affect the product size, the bilateral clearance of 0.01~0.02mm can be used for fitting.
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2022.11.11

How to deal with the problem of press injury of die stamping parts

Stamping is one of the forming production processes for large quantities of parts. Mold failure is the most common problem in stamping production, which often causes production stoppage and affects the production cycle of products. Therefore, it is necessary to find the cause of mold failure as soon as possible and maintain it reasonably.What are the reasons for the jumping chips and crushing of the stamping parts in the stamping die factory, and what countermeasures should be taken?The causes of chip jumping and crushing of die stamping parts and the corresponding countermeasures are as follows:1) When the clearance is too large, control the machining accuracy of the punch and die or modify the design clearance;2) In case of improper feeding, trim the tape and clean the mold in time when it needs to be sent to the proper position;3) The stamping oil drops too fast, and the oil is sticky. Control the amount of stamping oil drops or change the oil type to reduce the viscosity;4) The mold is not demagnetized, and it must be demagnetized after study (more attention should be paid to the iron stamping materials);5) The punch is worn and scraps are attached to the punch, so the punch knife edge needs to be studied;6) If the punch is too short and the length of the inserted die is insufficient, the length of the punch blade into the die shall be adjusted;7) The material is hard and the punching shape is simple. Ejectors can be installed on the end face of the punch edge or chamfers or arcs can be trimmed to reduce the fitting area between the end face of the punch edge and the chipsThe emergency measures are:Reduce the sharpness of the die edge, reduce the amount of research and study on the die edge, increase the roughness (coating) of the straight edge surface of the die, use a vacuum cleaner to absorb waste materials, reduce the impact speed, and slow down chip jumping.
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2022.11.04

What are the maintenance points of continuous stamping die

It is very necessary to do a good job in the maintenance of the continuous stamping die in the process of use, and it is more necessary to carry out careful and patient maintenance, so as to ensure the safety and usability of the continuous stamping die.So, do you know what maintenance points are for the continuous stamping die?1. Maintenance of punch and dieWhen disassembling the male and female die, pay attention to the original condition of the die, so that it can be easily restored during subsequent mold installation. If there is padding or displacement, the thickness of the gasket shall be engraved on the parts, and records shall be made.When replacing the punch, try to insert the stripper to see whether the die is smooth and whether the clearance between the plug and the die is even; When replacing the female die, check whether the clearance between the insertion and the punch is even.As the punch becomes shorter after grinding, it is necessary to add gasket to reach the required length. Check whether the effective length of the punch is sufficient. To replace the broken punch, find out the cause, and at the same time, check whether the corresponding die has a broken edge and whether it needs to grind the edge.When assembling the punch, check whether the clearance between the punch and the fixed block or the fixed plate is sufficient, and if there is a pressure block, check whether there is movement allowance; When assembling the female die, it shall be placed horizontally, and then a flat iron block shall be placed on the female die surface. It shall be gently knocked into place with a copper rod. It is not allowed to strike the female die with force at an angle. The bottom of the female die shall be chamfered. After installation, check whether the die surface is flush with the die surface.After the punch, die and mold core are assembled, the care belt shall be checked as necessary to see whether the parts are installed incorrectly or reversely, whether the die and die cushion block are installed reversely, whether the blanking hole is blocked, whether the new parts need to steal materials, whether the materials need to be stolen are enough, and whether the parts that need to be locked are locked.Pay attention to confirm the locking of the stripper plate screws. When locking, use balanced force to cross lock from the inside to the outside. Do not lock one screw first and then another to avoid tilting the stripper plate, leading to punch fracture or lower mold accuracy.2. Maintenance of stripper plateTo remove the stripper, first use two elevators to pry it up, and then use both hands to balance the force to take it out. In case of difficulty in disassembly, check whether the inside of the mold is cleaned, whether all the locking screws are disassembled, and whether the mold is damaged due to material jamming. Find out the cause and then do the corresponding treatment. Do not blindly dispose.When assembling the stripper plate, first clean the punch and stripper plate, add lubricating oil at the guide post and punch guide, put them in steadily, 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 are guided normally, whether each part is damaged, whether the new punch can pass smoothly, and whether the position of the stripper plate is correct), find out the cause, and then handle it accordingly.If there is pressure block on the fixed plate, check whether the space on the stripper back plate is enough. The material contact surface between the stripper plate and the female die is stamped for a long time to produce indentation. When the indentation is serious, it will affect the pressing accuracy of the material, resulting in abnormal product size, instability, etc. The stripper insert and stripper plate need to be repaired or reground.The contour sleeve shall be checked for accuracy. Unequal height will cause the stripper plate to tilt, and its precise guidance and stable spring compression functions will be damaged, so it must be maintained.3. Guide part inspectionCheck the fit clearance of the guide post and guide sleeve, whether there are burns or wear marks, and whether the oil supply of the die guide is normal. The wear of the guide parts and the damage of the precision will reduce the precision of the mold, and problems will occur in various parts of the mold. Proper maintenance and regular replacement must be carried out.Check the accuracy of the guide part. If the guide pin is worn and has lost its proper accuracy and function, it must be replaced. Check the condition of the stripper spring and ejector spring to see if they are broken, or if they have been used for a long time without breaking but have lost their original strength due to fatigue, they must be regularly maintained and replaced, otherwise, they will cause damage to the mold or the production will not be smooth.4. Adjustment of die clearanceThe positioning hole of the die core is worn due to frequent and repeated combination of the die core, resulting in large clearance after assembly (looseness after assembly) or uneven clearance (positioning deviation), which will cause the shape of the section after punching and cutting to become worse, the punch is easy to break, and burrs are generated. The appropriate clearance can be adjusted through the inspection of the section after punching and cutting.When the clearance is small, the section is small, and when the clearance is large, the section is large and the burr is large, so the reasonable clearance can be obtained by shifting. After adjustment, proper records should be made, or marks can be made at the die edge, so as to facilitate subsequent maintenance.
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2022.10.25

What are the classifications of continuous stamping dies

Continuous stamping die is a special process equipment that processes 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).So, do you know the classification of continuous stamping dies?1. Open die: blanking parts with simple structure, small size, light weight, easy manufacturing, low cost, low service life, poor accuracy, low accuracy requirements, simple beginning, small batch or trial production.2. Guide plate type: the precision is higher than that of the open die, and it is suitable for blanking parts with simple start and small workpiece size. The stroke of the press is required not to be greater than the thickness of the guide plate.3. Guide pillar type: guide pillar ensures even blanking clearance, high dimensional accuracy of blanking parts, long service life of die, convenient installation, and suitable for mass production.4. Continuous die: strip material shall be accurately positioned to ensure the mutual position accuracy between inner hole and contour. High productivity, with a certain blanking accuracy, suitable for mass production.5. Compound die: The internal and external shapes of stamping parts have high mutual position accuracy, which is suitable for mass production.
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2022.10.14

What are the skills in the development, design and manufacture of stamping dies

The development, design and manufacture of stamping dies is a complex and cumbersome process. If you want to know what skills are in the development, design and manufacture of stamping dies, the following are some points for your reference.1. Information from the waste situationScrap is essentially the reverse image of the forming hole. When developing, designing and manufacturing stamping dies, we must learn to see problems from the scrap. By checking the scrap, you can tell if the upper and lower die gaps are correct. If the gap is too large, the waste will appear rough and undulating. The larger the gap, the greater the angle the fracture surface makes with the bright band area. If the gap is too small, the scrap will exhibit a small angled fracture surface and a wide bright band area. An ideal scrap should have a reasonable collapse angle and a uniform bright band, which can keep the punching force to a minimum and form a neat round hole with very few burrs. Therefore, in the manufacturing process, learn to see information from the scrap. . Second, the choice of mold clearance1. During the development, design and manufacture of stamping die, the clearance of the die is related to the type and thickness of the material being punched. Unreasonable clearance can cause the following problems:2. If the gap is too large, the burr of the stamped workpiece will be relatively large, and the stamping quality will be poor. If the gap is too small, although the quality of punching is good, the wear of the die is serious, which greatly reduces the service life of the die, and it is easy to cause the breakage of the punch;3. If the gap is too large or too small, the material will be damaged, which will affect the actual use of the material;4. Reasonable clearance can prolong the life of the mold, the unloading effect is good, the burr and flanging are reduced, the plate is kept clean, and the hole diameter is consistent without scratching the plate, reducing the degree of damage of the material, and allowing the material to exert its own value.3. How to improve the service life of the moldFor users, improving the service life of the mold can greatly reduce the stamping cost. The factors that affect the development, design and manufacture of die stamping die are as follows:1. The type and thickness of the material; 2. Whether a reasonable manufacturing gap is selected; 3. The structure of the mold; 4. Whether the material is well lubricated during stamping; Whether the gaskets in the mold are used reasonably; 7. Whether the mold base of the machine tool has been worn, etc. These are the reasons that need to be paid attention to in the manufacturing process.
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2022.10.09

The material of the stamping die is not good, and it is easy to be broken during processing

Due to different stamping processes and different working conditions, there are many reasons for the bursting of stamping dies, and the life of dies of different materials is often different. To this end, the basic requirements for the material of the working parts of the die are put forward:(1) The performance of the material should have high hardness (58-64HRC) and high strength, as well as high wear resistance and sufficient toughness, small heat treatment deformation, and certain hot hardness;(2) The process performance is good. The processing and manufacturing process of the working parts of the die is generally complicated, therefore, it must have adaptability to various processing techniques, such as forgeability, machinability, hardenability, hardenability, quenching crack sensitivity and grinding workability, etc. .Heat treatment: deformation caused by improper quenching and tempering processPractice has proved that the thermal processing quality of the mold has a great influence on the performance and service life of the mold. According to the analysis and statistics of the reasons for the failure of the mold, the "accidents" of mold failure caused by improper heat treatment account for more than 40%.(1) Forging process: This is an important link in the manufacturing process of mold working parts. For molds of high alloy tool steel, technical requirements are usually put forward for metallographic structures such as material carbide distribution.(2) Preliminary heat treatment: Depending on the material and requirements of the working parts of the mold, preliminary heat treatment processes such as annealing, normalizing or quenching and tempering should be used to improve the structure, eliminate the structural defects of the forging blank, and improve the processing technology. After proper preparatory heat treatment, the high carbon alloy die steel can eliminate the reticulated secondary cementite or chain carbide, make the carbide spheroidized and refined, and promote the uniformity of carbide distribution, which is conducive to ensuring quenching and tempering. quality, improve mold life.(3) Quenching and tempering: This is the key link in the heat treatment of the mold. If overheating occurs during quenching and heating, it will not only cause greater brittleness of the workpiece, but also easily cause deformation and cracking during cooling, which will seriously affect the life of the mold. When the die is quenched and heated, special attention should be paid to preventing oxidation and decarburization, and the heat treatment process specification should be strictly controlled. When conditions permit, vacuum heat treatment can be used. After quenching, it should be tempered in time, and different tempering processes should be adopted according to technical requirements.(4) Stress relief annealing: After rough machining, the mold working parts should be subjected to stress relief annealing treatment. The purpose is to eliminate the internal stress caused by rough machining, so as to avoid excessive deformation and cracks during quenching. For molds with high precision requirements, stress relief tempering is required after grinding or electrical machining, which is conducive to stabilizing mold accuracy and improving service life.
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2022.10.05

The solution to demoulding

Why is the problem of demolding difficult? 1) There are grooves in the mold; 2) Insufficient demoulding slope; 3) The mold finish is not high. Failures caused by insufficient drafting slope are very common. When designing products, the drafting slope must be marked on the drawing. The drafting slope is usually in the range of 1 to 2 degrees. It is better to be as large as possible, and it is also allowed to be more than 0.5 degrees in special occasions. If the injection pressure is too high, the product is too close to the mold, and demolding becomes difficult. In order to smoothly release the product from the mold, generalists use a release agent containing silicone oil, but when using the release agent, only a very thin layer can be applied. If the spray is too thick, it is difficult to wipe off. In addition, due to the action of the release agent, the secondary processing such as printing marks on the product becomes very bad. Once the release agent coated on the mold is attached to the product, it is quite difficult to wipe it off. Based on the above root cause, come up with a solution: 1. Immediately: reduce the injection pressure, shorten the pressure holding time, reduce the mold temperature, reduce the demolding speed, spray the mold release agent 2. Short term: Improve the finish of the mold cavity 3. Long-term: increase the demoulding slope and increase the number of demolding pins For heavy and hard materials, such as GPPS, it is common for products to break due to insufficient lift off. For both sticky and soft materials, such as PE, it is possible to cut off the product in several pieces. The PVC drain pipe is mainly used for water supply, and the diameter of the drain pipe is generally 50-75-110-160 and so on. The PVC drainage pipe is made of sanitary polyvinyl chloride (PVC) resin as the main raw material, adding an appropriate amount of stabilizers, lubricants, fillers, color enhancers, etc., through extrusion molding by plastic extruder and injection molding by injection molding machine. Curing, shaping, inspection, packaging and other processes to complete the production of pipes and fittings. PVC drainage pipe is an alternative to traditional drainage pipes and has better physical and chemical properties. It has a smooth inner wall and lower frictional resistance than conventional drainage materials, so the installation slope of the transverse pipe is smaller, which can improve the indoor clear height of the building. At the same time, the PVC drainage pipe is light in weight, one-fifth of the cast iron pipe, easy to transport and operate; it adopts adhesive connection, which is convenient for installation and maintenance; the price is lower than that of conventional drainage pipes, which greatly reduces the project cost; strong corrosion resistance, It is widely used in construction sewage and rainwater pipeline systems. In addition, the widespread use of PVC drainage pipes is conducive to saving steel, which is of great significance for alleviating the shortage of steel in our country.
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2022.09.29

What is the main reason why the punch of the stamping die wears too fast

Stamping die is a special process equipment that processes materials (metal or non-metal) into parts (or semi-finished products) in cold stamping, called cold stamping die (commonly known as cold stamping die).The mold gap is too small. Generally, the total gap of Jianhan molds is 20% and 25% of the material plate thickness.The alignment of the convex and concave molds is not good, including the lack of precision of the mold base, the mold guide components and the turret sleeve, which cause the mold to be bad for the towel parts.The temperature of the punch is too high, mainly due to the overheating of the punch caused by the continuous long-term stamping of the same die.Improper mold sharpening method results in mold annealing and increased wear.Local unilateral punching, such as nibbling, punching or shearing, the lateral force of aluminum alloy door and window fittings will cause the punch to deviate to one side, and the clearance of this side will be reduced, resulting in serious mold wear. If it is too high, it will cause the punch to deflect over the upper die, causing damage to the punch and die.The material of the mold will cause the rebound of the scrap, and its related factors:The sharpness of the die edge, the larger the fillet of the edge, the easier it is to cause the waste to rebound.The input modulus of the mold and the input modulus of each upper position of the machine tool are certain, and the mold modulus is small, which is easy to cause waste to rebound.The gap of the mold is reasonable. If the gap of the mold is not suitable, it is easy to cause the waste to rebound.Whether there is more oil on the surface of the processed sheet.The spring is fatigued and damaged.The method to prevent mold with material:Use a special anti-tape material die. Aluminum alloy door and window accessoriesMolds are often sharpened and demagnetized.Increase the die gap.The oblique edge n die is used instead of the flat edge die.The mold installs the ejector.Reasonably increase the input modulus of the mold.Check the fatigue strength of the die spring or discharge sleeve.Die alignment problemWhen the mold is in use, the wear amount on each side of the punch is different, and some parts have large scratches and wear faster. This situation is especially obvious on narrow rectangular molds. The main reasons for this problem are:The machine tool turret design or machining accuracy is insufficient. The main reason is that the alignment of the upper and lower turntables and the mold mounting seat is not good.The design of the mold or the addition of precision cannot meet the requirements.The precision of the guide sleeve of the die punch is not enough.Improper selection of die gap.Die mounts or die guide bushes are not well aligned due to long-term wear and tear.
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