Techniques

Zhejiang Balford Mechatronics Co., ltd focus on difficult stamping & deep drawing. Main product: motor housing and difficult custom deep drawn stampings.

  • Factors influencing the dimensional accuracy of metal stamping parts

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    Different metal stamping products have different requirements for accuracy. As long as we meet the accuracy requirements of customers and comprehensively consider production costs, we can produce qualified stamping parts. The factors that affect the dimensional accuracy of metal stampings must be known by everyone. Let’s have a look together.The dimensional accuracy of metal stamping parts refers to the difference between the actual size of stamping parts and the basic size. The smaller the difference, the higher the dimensional accuracy of metal stamping parts.

    The influencing factors are as follows:

    1. Manufacturing precision of metal stamping die.

    2. Gap between male and female dies.

    3. Elastic recovery of materials after stamping.

    4. Accidental factors in the production process, such as inaccurate positioning, unstable material performance, etc.

    It can be divided into precision level and ordinary level. The ordinary level is the precision that can be achieved by more economic means, while the precision level is the precision that can be achieved by stamping technology.

    The surface quality of metal stampings shall not be higher than that of raw materials, otherwise, subsequent processing is required to achieve it, increasing production costs.

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  • Factors influencing the dimensional accuracy of metal stamping parts

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    Different metal stamping products have different requirements for accuracy. As long as we meet the accuracy requirements of customers and comprehensively consider production costs, we can produce qualified stamping parts. The factors that affect the dimensional accuracy of metal stampings must be known by everyone. Let’s have a look together.The dimensional accuracy of metal stamping parts refers to the difference between the actual size of stamping parts and the basic size. The smaller the difference, the higher the dimensional accuracy of metal stamping parts.

    The influencing factors are as follows:

    1. Manufacturing precision of metal stamping die.

    2. Gap between male and female dies.

    3. Elastic recovery of materials after stamping.

    4. Accidental factors in the production process, such as inaccurate positioning, unstable material performance, etc.

    It can be divided into precision level and ordinary level. The ordinary level is the precision that can be achieved by more economic means, while the precision level is the precision that can be achieved by stamping technology.

    The surface quality of metal stampings shall not be higher than that of raw materials, otherwise, subsequent processing is required to achieve it, increasing production costs.

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  • Influence of Die Clearance on Stamping Parts

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    As stamping parts manufacturers know, stamping requires reasonable blanking clearance, which can achieve better section quality, higher dimensional accuracy, smaller blanking force and higher die life. Now let’s understand the influence of die clearance.The relationship between the customized die clearance and blanking force of stamping parts. The smaller the clearance, the greater the blanking force. On the contrary, increasing the clearance can reduce the blanking force. When the clearance is reasonable, the upper and lower cracks coincide, and the large z blanking force will be smaller;

    The accuracy of stamping parts refers to the error value between the actual size and the basic size. The smaller the difference, the higher the accuracy. When the gap is large, the material will be larger under the tensile action. After stamping, the material will have elastic recovery, and the size of the blanking part will be smaller than the die size. When the gap is small, the elastic recovery of the material will make the size of the blanking part larger and the hole diameter smaller;

    During the processing and customization of stamping parts, the pressure on the die edge is very large, which causes local adhesion and wear when it contacts with materials. When the gap is small, the contact pressure becomes larger and the distance is longer, leading to accelerated wear of the die. When the gap is large, the material tension increases relatively, and the positive pressure on the end face of the die edge increases, which is easy to cause tool breakage or deformation, leading to die wear.

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  • Pay attention to 9 major issues when designing precision stamping dies

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    As an important tool in the process of stamping production, stamping die has its own characteristics. When designing stamping dies, stamping processing plants need to consider from a scientific and reasonable perspective to improve the service life, durability, production efficiency, reduce production costs and ensure product quality. Baifudu Precision Stamping – With 20 years of experience in customized processing of stamping parts, various complex precision stamping products can be customized according to customer needs. Then, what should we pay attention to when designing the mold? Baifudu Precision Stamping will tell you next.1. In mold design, the selection of mold materials, heat treatment and surface treatment.

    2. Strip design is the analysis of the product forming process, which basically determines the success of the die.

    Before designing the material belt, we need to know the tolerance requirements, material properties, punching tonnage, punching table, SPM (times of punching per minute), feeding direction, feeding height, die thickness requirements, material utilization rate and die service life of the parts. When designing the tape, CAE analysis should be carried out at the same time, mainly considering the material thinning rate, and more communication with customers.

    3. When testing the mold, make sure to slowly close the upper mold. During the stretching process, make sure to use the fuse to test the material layer thickness. When the material level gap reaches the material thickness, try the die again, and the blade must be aligned first. For drawbead, use a movable insert to adjust the height of the drawbead. After the mold is matched, the datum hole and datum plane must be measured on the fixture, or sent to CMM for 3D report.

    4. For parts with more bending, the bending shall be adjusted step by step according to the process during die adjustment.

    5. When adjusting the forming angle, you can reduce the R angle or move the polyline reference during the bending process to reach the forming angle.

    6. During die adjustment, the gasket is mainly used to adjust the height of the forming punch, or move the forming punch from left to left. Washers are usually stainless steel hardware.

    7. For trimming line affected by forming, cutting shall be selected after forming, and special position can be realized by cross cutting.

    8. For multiple datum hole locations, the method of one-time punching forming shall be adopted to avoid affecting the accuracy after step-by-step punching.

    9. For product fracture, a variety of methods can be used, such as adding packaging, extruding, and increasing the forming area of plate bar and opening in the late stretching process. CAE analysis shall be carried out after mold modification.

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  • Causes and Solutions of Stamping Scrap

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    There will be stamping scrap during the stamping process of metal stamping parts, especially in the case of mass production, the production of scrap will increase costs, affect production efficiency and reduce the durability of molds. In this paper, we will introduce the possible causes of stamping scrap and the corresponding solutions.

    1. Reasons

    (1) The quality of the steel purchased does not meet the national standards, such as unstable materials, out of tolerance dimensions, and unqualified surface accuracy.

    (2) The stamping die is not installed and used correctly.

    (3) After the die is used for a long time, the gap becomes larger or the die accessories are worn, leading to waste products.

    (4) During the stamping process, the mold needs to withstand a huge impact force, resulting in the loosening of bolts or other accessories, which affects the normal production of the entire mold.

    (5) In the process of operation, the puncher did not strictly install the positioning device for feeding.

    (6) The stamping worker did not produce according to the operation manual formulated by the company.

    1. Solutions

    (1) When purchasing raw materials, it is necessary to strictly install the standard of Guo. Try to choose regular steel dealers or products from large steel plants; Test the composition, surface roughness and dimensional accuracy of steel or obtain the material report from the supplier.

    (2) The punches and stamping dies used in the factory shall always be in a stable running state, and they shall be regularly maintained and overhauled.

    (3) During stamping, the die shall be kept clean, and the workpieces and raw materials in the workshop shall be placed in order.

    (4) Proper tools must be used for feeding and picking up to avoid scratching the products.

    (5) After the stamping process is designed, the stamping workers shall operate in strict accordance with the process rules. Each stamping product has a different stamping process, and the management shall formulate the corresponding process rules before processing the product.

    (6) Formulate perfect quality inspection regulations. The first batch of products must be completely inspected before formal production, and regular sampling inspection shall be conducted during production.

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  • Differences between forming and finishing of stamping parts

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    In order to improve the precision of metal stampings, some stamping processes, such as refurbishment and refurbishment, are sometimes added during the production process of stamping parts. So, people who have just entered the industry will ask, what is the difference between the two?Shaping is to use the reshaping die to press the inaccurate parts of the bending or stretching parts into an accurate shape; Or for the stamping parts with surface flatness requirements, the flat stamping parts with arch bending and warping shall be flattened with the leveling die. That is to say, depending on the material flow, the shape and size of the process parts are changed a little to ensure the accuracy of the workpiece. It belongs to the forming process of stamping parts.

    Trimming is to remove the allowance of the outer edge or inner hole of the blank with the trimming die to obtain a smooth section and accurate size. It is a blanking process applied to stamping parts and belongs to blanking process.

    That is to say, shaping is used for the forming process of stamping parts to improve the shape quality and dimensional accuracy of finished metal stamping parts; The trimming is often used in the blanking process of stamping parts to obtain high-quality blank or inner hole of stamping parts and improve the dimensional accuracy.

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  • The Method of Punching Small Holes for Stamping Parts

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    In this paper, we will introduce the method and points for attention of punching small holes in the processing of stamping parts. With the development of science and technology and society, the previously commonly used machining method of micro holes has gradually been replaced by the stamping method. By making the punch firm and stable, improving the punch strength, preventing punch fracture and changing the stress state of the blank during punching, etc.The ratio d/t of the punching diameter to the material thickness in stamping can reach the following values: 0.4 for hard steel, 0.35 for mild steel and brass, and 0.3 for aluminum.

    When punching a small hole on a sheet, when the material thickness is greater than the punch diameter, the punching process is not a shearing process, but a process of extruding the material into the die through the punch. At the beginning of extrusion, part of the washed waste is compressed and squeezed into the area around the hole, so the thickness of the washed waste is generally less than the thickness of the raw material.

    When punching small holes in stamping parts, due to the small diameter of punch punch, if common blanking method is used, the small punch is easy to break, so try to improve punch strength to prevent it from breaking and bending. The methods and precautions are as follows:

    1. The stripper serves as a guide plate.

    2. The guide plate and the fixed working plate are connected by a small guide post guide sleeve or directly with a large guide post guide sleeve.

    3. The punch shall be retracted into the guide plate, and the distance between the guide plate and the punch fixing plate shall not be too large.

    4. The bilateral clearance between punch and guide plate is less than the unilateral clearance between punch and die.

    5. The pressing force is 1.5~2 times greater than that of simple stripping.

    6. The guide plate shall be made of or inlaid with high hardness materials, and the thickness shall be 20%~30% compared with the normal situation.

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  • Measures for Uneven Stripes on the Surface of Metal Stamping Parts

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    In the process of stamping, uneven stripes will appear on the surface of metal stamping parts, which will affect the surface quality and overall strength of stamping parts, and even scrap the products in serious cases. That is why this problem occurs, and what measures can be taken to effectively control and avoid it? Let’s get to know.It is mainly to improve the friction characteristics between metal stamping parts and tools, improve the stiffness of the whole system, increase the damping of the system, and reduce the cutting load. Specific measures are as follows for your reference:

    1. Use appropriate tools and stamping raw materials, and select appropriate tools for different metal stamping materials, so that the mutual friction system between tools and workpieces and the difference between dynamic and static friction coefficients of tools and workpieces are as small as possible.

    2. Adding cutting fluid with good performance can better improve the friction characteristics of tools and precision parts.

    3. Improve the stiffness of the system: increase the stiffness of the whole process, which can effectively reduce the occurrence of this phenomenon.

    4. Reduce the length of the tool extending out of the tool rest, thicken the tool handle, and improve the rigidity of the tool rest.

    5. To increase the damping of the system, materials with large internal damping can be selected as the supporting parts, or high damping materials can be added to the components or damping links can be used to reduce the occurrence of vibration.

    6. Reduce the length diameter ratio of stamping parts, and use intermediate supports such as center frame to increase the rigidity of the workpiece.

    7. Properly thicken the diameter of the transmission lead screw in the feed mechanism, shorten the length of the lead screw, etc., improve the transmission stiffness of the feed mechanism, try to eliminate the gap between the transmission components in the feed mechanism, give the transmission of the feed mechanism, and improve the stiffness of the machine tool transmission system.

    8. The ball screw is used to replace the ordinary thread screw, the liquid friction is used to replace the boundary or dry friction, and special lubricating oil is used to improve the sensitivity of the feed system by improving the friction performance of the machine tool transmission system, so as to reduce the occurrence of the vibration of the metal stamping parts.

    9. In the process of metal stamping, when the feed speed is low and there is vibration, it is necessary to stop the machine immediately, analyze the causes of the phenomenon, and take targeted effective measures to eliminate the phenomenon, so as to ensure the normal metal stamping process.

    10. Reduce the load of cutting and improve the vibration of metal precision stamping parts during cutting by reducing the amount of back cutting and reducing the weight of each transmission component.

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  • Five methods to reduce the concavity and convexity of metal stamping parts

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    The cause of concave convex of metal stamping parts is mostly due to dust or iron filings attached to the appearance of raw materials or molds, which makes the appearance and quality of products low, but also makes the productivity drop. So how can we avoid this problem? The following is a summary of the following five methods to reduce the concavity and convexity of metal stamping parts in practice.

    Five methods to reduce the concavity and convexity of stamping parts:

    1. Inspection and correction of drawing die: the drawing die needs regular inspection and maintenance to reduce the generation of convex and concave and maintain a stable state. The general practice is to use samples to check the bonding scratch and machining surface (die fillet, punch fillet) of the blank holder.

    2. Inspection and correction of the shear die: The reason for the convex concave after the shearing process is that the iron powder is produced during the shearing process, so the iron powder must be observed before stamping to avoid the convex concave.

    3. Proper manipulator speed: For semi-automatic drawing die production, when the drawing punch is at the lower die position and the manipulator speed is fast, the burr will fall on the upper part of the punch, causing convex concave. To avoid this problem, we can do the discharging test of the parts before production, and reasonably set the speed and discharging angle of the manipulator so that it will not touch the parts and the lower mold.

    4. Check the section: when cutting off the coil, the wear and damage of the cutting die will produce a lot of tiny iron powder attached to the cutting edge, so the double section must be checked in the material area or the stamping line before stamping production, and the plate must be cleaned and deburred in time.

    5. Inspection of sheet cleaning device: Before stamping production, it is necessary to inspect, trim, clean and settle the sheet at the same time, so that it may clean the sheet more effectively, which is also very necessary, and pay attention to the roller clearance and the quality of cleaning oil. The detailed method is to apply red paint on a steel plate before cleaning and settling it. At present, check the shape of the red paint before it is removed. If the removal rate is not up to standard, check and repair the cleaning and settling. Timely in case of lack of cleaning oil

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  • What affects the stability of stamping processing

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    What affects the stability of stamping? First of all, we need to know that this stability can be divided into process stability and production stability. The former guarantees the quality of stamping products, and the latter guarantees the production capacity of stamping manufacturers. It can be seen that both are very important. The factors affecting stability are summarized as follows.1. The performance of stamping materials, the fluctuation of thickness, the variation range of materials and other factors have a certain impact on the quality of metal stamping parts and the stability of stamping dies;

    2. The selection of stamping die materials and the strength design of die structures are directly related to the stability of metal stamping parts;

    3. The resistance of draw bead and the variation range of blank holder force play an important role in the quality stability of metal stamping parts during drawing.

    4. The reasonable selection of lubricant will directly affect the stability of stamping and the service life of stamping die.

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  • What are the common problems in the processing of metal stamping parts?

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    1. Some common problems and reasons in the processing of stamping parts

    1. Roller printing: It is caused by foreign matter adhering to the cleaning roller or paper feeding roller (occurs at a fixed distance). Under normal circumstances, the foreign matter printed by the roller on the sheet can be removed.

    2. Burrs: In the process of punching or chamfering, there is incomplete residual material, and burrs are generated in the part below the truncated surface of the steel plate. Based on the truncated surface, the iron powder generated here will damage the mold and produce Concave and convex.

    3. The coil may be crushed or the edge is wrinkled: When the gap between the guide rollers on the die is small, the guide rollers of the uncoiler may be wrinkled, which is caused by the unyielding balance of the coil feed.

    4. Concave and convex: The material is abnormally convex or concave due to foreign matter (iron filings, dust) mixed in the uncoiler.

    5. Sliding mark: It is caused by the sliding of the roller, which occurs when it suddenly stops or accelerates.

    When we design the mold, we must have reasonable clearance value, fillet radius and machining accuracy. When designing a bending die, effective measures should be taken to reduce the springback, and the springback should be subtracted from the die; reasonable rounded corners should be designed to prevent bending cracking. When deep drawing, use a blank holder to prevent wrinkling, and the pressure should be moderate; use appropriate lubrication to reduce the drawing resistance to prevent the die from sticking or the workpiece being pulled through.

    There are many defects in metal stamping parts, such as scratches, cracks, raised dents, burrs, oxidation, etc. In the processing of metal stamping parts, we must pay attention to these details, so as to bring greater benefits. Spinning is a metal rotary machining process. During the processing, the blank is actively rotated with the spinning die or the spinning head is actively rotated around the blank and the spinning die. hollow revolving body parts.

    Reshaping is the second reshaping of the product shape using the established tool shape. Mainly reflected in the pressing plane, spring feet, etc. In view of the elasticity of some materials, the quality of one-time forming cannot be guaranteed. Reprocessing is a basic stamping process that uses molds to separate materials. , forming and other stamping processes to prepare the blank, and can also cut and trim the formed stamping parts. Blanking is widely used in automobiles, home appliances, electronics, light industry, instrumentation, machinery, railways, communications, chemicals, textiles, aerospace and other industries. The blanking process accounts for about 50% to 60% of the entire stamping process.

    Forming process:

    (1) Bending: a plastic forming method that bends metal sheets, pipe fittings and profiles into a certain angle, curvature and shape. Bending is one of the main processes widely used in the production of stamping parts. The bending of metal materials is essentially an elastic-plastic deformation process. After unloading, the workpiece will produce elastic recovery deformation in the direction, which is called rebound. Springback affects the accuracy of the workpiece and is a technical key that must be considered in the bending process.

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  • What are the common methods of precision mold processing?

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    No matter what kind of precision mechanical production equipment is manufactured, it is indispensable. The whole process of precision machine manufacturing includes: CNC machining center cutting, slow wire cutting, wire cutting, cutting, milling, precision measurement, automation technology, etc.

    1. CNC cutting production and processing

    The main cavity and surface of the injection mold are cut by CNC machining center. The rapid development of the rubber mold manufacturing industry is mainly due to the independent innovation of CNC machining center cutting technology.

    2. Slow wire cutting production and processing

    Slow wire cutting technology is mainly used to process 2, 3D standard surface parts, such as various mold shells, injection molds and unmetallurgical mold parts. Among them, the production and processing of metal molds accounts for a large percentage. The production and processing of many high-precision holes such as metal mold punching dies, punching fixed plates, cavities and reversing plates is the core technology that cannot be missing from slow wire cutting. In the production of plastic molds, the applications of inserting, top, inclined top holes, clear viewing angles and rollers are commonly used. Generally speaking, the machining accuracy cannot be compared with that of metal molds.Slow-moving wire is a highly sophisticated production method. The machining accuracy of advanced machine tools is less than 3μm, and the surface roughness can reach 0.05μm. At this stage, automatic production line laser cutting of 0.02-0.03_ electrode wire can be done. The drilling efficiency can be up to about 200mm_2/min.

    3. Processing grinder

    CNC grinding machine is a kind of machine tool for deep processing of the surface of parts. Small and medium-sized tool grinders are mainly used for the production and processing of small and medium-sized mold parts, such as high-precision inserts, precision machinery manufacturing, rollers, etc. Large and medium-sized water mills are often used in the production and processing of large and medium-sized molds. At this stage, fast grinding wheels and operating tables have become a common development trend. Due to the use of professional components such as linear slides, servo motors, and hydraulic press screws, the speed ratio of the grinding wheel has been greatly developed, and the refurbishment technology of the grinding wheel has also been greatly developed.

    4. Processing center

    The mold shell production workshop is also a common machining center. Its production category is the whole gyro picture part. Due to the extreme development trend of CNC machining technology, it is easier to complete complicated rotations according to the programming, and CNC lathes can replace special tools by themselves to further improve production efficiency. With the continuous improvement of the machining accuracy and production technology of the machining center, there is even a development trend of out-feed grinding. It is often used to process components such as round inserts, supports, and accurately positioned rings in molds. Can be widely used in signature pen molds, water bottle molds, etc. In fact, the role of a good machining center will no longer be limited to “vehicles”. This is a composite CNC lathe for cutting and turning. A more complex and more complete process can even be solved at one time.

    5. Accurate measurement

    High-precision measurement is very important for the data drawing involved in the original design of the mold shell, the accurate measurement of mold manufacturing, and the accurate measurement of the mold shell repair in the middle and later stages. The role of high-precision measuring equipment is very important.

    Fast clamping of mobile phone positioning systems and automation technology.

    Mold parts often require various processes to manufacture. During this phase, the parts are constantly clamped and adjusted, which takes a lot of time. CNC lathes are still vacant, and the production capacity of expensive machinery is not being used flexibly. With the increasingly fierce market competition in the manufacturing industry. Production cuts are a growing trend. The stability and accuracy standard management system selected by foreign mold and fixture manufacturers has completed the exchange of unified standards for cutting, cold rolling, precision measurement, and wire EDM. CNC lathes for quick electrical installation and calibration in under a minute. The repeated positioning accuracy is within 3 microns, which reduces the setting time and further improves the actual running time of the CNC lathe. These have proven necessary for modern manufacturing.

    The above is about the relevant content of precision mold processing. In fact, the process of mold processing and material selection are very important, and the design methods and processing procedures required by different molds will also be different, but it is worth considering that no matter what kind Mold and processing technology need to be continuously improved. Hope the above content is helpful to readers.

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  • Talking about the stamping and blanking process of sheet metal processing

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    1. Sheet metal processing stamping and blanking method

    1. Punch: After using the punch to unfold the parts on the plate in one or more steps, the plate is cut into various shapes of material parts. Its advantages are short time-consuming, high efficiency, high precision and low cost. Suitable for mass production, but the mold should be designed.

    2. Sawing machine: mainly use aluminum profiles, square tubes, drawing tubes, round bars, etc., with low cost and low precision.

    3. Shearing machine: It uses shearing machine to cut simple pieces of strips. It is mainly prepared for mold blanking and forming. The cost is low and the precision is lower than 0.2, but it can only process strips or blocks without holes and corners. material.
    4. NC CNC blanking, when NC blanking, you must first write a numerical control machining program, use programming software, and write the drawn unfolding diagram into a program that can be recognized by the NC digital drawing machine tool, allowing it to gradually cut various parts on the flat plate according to these programs. It is a flat plate of this shape, but its structure is made of a tool structure, the cost is low, and the accuracy is 0.15.

    5. Laser cutting is to use the laser cutting method to cut the structural shape of the flat plate on the large flat plate. The same NC laser program also needs to be written, and it can cut flat plates of various complex shapes. The cost is high and the precision is 0.1.

    Sheet metal processing is a key technology that sheet metal technicians need to master, and it is also an important process for sheet metal product forming. Precision sheet metal processing includes traditional cutting, blanking, bending and forming methods and process parameters, including various cold stamping die structures and process parameters, various equipment working principles and operation methods, as well as new stamping technologies and new processes . Sheet metal processing of parts is called sheet metal processing.

    Stainless steel SUS304 is one of the most widely used stainless steels. Because it contains Ni (nickel), it is more resistant to corrosion, heat resistance, better mechanical properties, no heat treatment hardening, and no elasticity than steel containing Cr (chromium).

    Stainless steel SUS301Cr (chromium) content is higher, SUS304 is lower, corrosion resistance is poor, but good tension and hardness can be obtained in stamping sheet metal processing, good elasticity, mainly used for springs and anti-corrosion EMI.

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  • How to deal with surface oxidation of sheet metal processing castings?

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    First, the main equipment of sheet metal processing manufacturers

    1. Sports equipment: ordinary drill, cleaning car, conversion bed, numerical control (CNC).

    2. Cutting equipment: ordinary shift, CNC tilt, laser cutting machine, CNC punch.

    3. Surface treatment equipment: The motor consists of electrical, electrolyte shell, oxidation through wire, color.

    4. Adjust the equipment: Customize the equipment.

    5. Welding: argon arc welding machine, carbon dioxide shielded welding device, electric welding machine and automatic welding machine.

    Laser cutting is a metal plate made by laser cutting, and the plate thickness processed cold plate hot rolled plate is less than or equal to. 0 mm, less than 10.0 mm for stainless steel. The advantages are the thickness of the machined plate, the cutting and machining flexibility of the workpiece. The disadvantage is that it cannot be processed, the mesh is not suitable for processing, and the computing power is high.

    From the above characteristics of precision plate processing, it can be seen that compared with positive materials, calendered materials have a greater price advantage. Although there are still gaps between the quality of calendered materials and positive materials, these gaps are gradually narrowing with the improvement of calendering production process and production technology, which are also welcomed by downstream end users.

    Generally speaking, stainless steel cold-rolled materials are mainly used in civil industry. In order to maximize profits, downstream enterprises must control production costs. The price difference between the stainless steel material and the narrow strip just provides a living space for the stainless steel narrow strip industry.

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  • Do you know how to install the punch of the stamping die?

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    First, remove the eroded mud in the hole of the punch fixing plate of the stamping die, fix the punch on the back of the plate, and chamfer (0.5 ~ 1.5) mm × 45 along the periphery of the cavity. The size of the chamfer depends on the stress of the mold. Chamfer the edge of the punch in the die about 0.25mm×45 around the contour.

    The line cutting marks on the edge end of the punch die in the punching die are slightly ground with a fine sand bar or a diamond file to facilitate the punch to enter the fixing plate, the tail should be left at a distance without repairing, and its length should be slightly greater than or equal to the fixing plate thickness of.

    Place a contour block whose height is greater than the length of the punch under the fixing plate and press the punch into the fixing plate; this work should be divided into several steps. When the punch enters the fixing plate and can stand upright, measure the perpendicularity between each other, and then measure when entering 1/3 and 1/2 respectively. If deviation is found, it should be corrected in time, and then continue to be confirmed.If the number of punches is large or the size is small, the stripper should be aligned with the die, and the punch should be aligned with the stripper.

    When the punch enters the fixed plate, the length of the tail end is 3~5mm left, stop pressing, heat the edge line of the tail end of the punch with an oxygen-acetylene flame, and hit it quickly with a small hammer to expand the red hot part; completely cooled After that, the punch is fully pressed into the fixing plate.

    Using contoured tires, grind the upper flat and punch end flat with the lower flat of the retaining plate.

    Based on the plane of the fixed plate, the stripper plate is sleeved on the punch, so that its working surface is slightly lower than the punch, and the chamfer of the working section of the punch is ground to a sharp edge.

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