Zhejiang Balford Mechatronics Co., ltd focus on difficult stamping & deep drawing. Main product: motor housing and difficult custom deep drawn stampings.
Hardware Fair - Metalworking This hardware fair specialized manufacture of metal stamping,SHEET METAL FABRICATION,CNC machining parts,stamping parts,machine parts,deep drawn, stamping die stainless steel stamping [caption id="attachment_6144" align="aligncenter" ...
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Metal stamping molds belong to single product production. The key to die assembly of metal stamping parts is how to ensure that the relative positions of the convex, concave and related parts can work reasonably when the mold is closed, and punch it to meet the product requirements. Below, the editor of Zhejiang Baifudu Electromechanical will share with you the assembly principles and technical requirements of metal stamping dies!
All kinds of parts that are processed and put into assembly of metal stamping parts must meet the requirements of the assembly process specified by various parts; for example, the relative position dimensional accuracy and step distance accuracy of multiple punch fixing plates and various holes must meet the requirements of the concave die. , the requirements of the discharge plate, the bolts and pins on the backing plate pass through the holes, and can be drawn according to the size of the drawing. The quenching, upper and lower surfaces should be strictly ground and smooth, and the overall die installed on the upper and lower die bases should be removed. In addition to the processing of all the holes to meet the requirements of the graphics, it is also necessary to process the bolt holes and pin holes, which can be assembled after heat treatment and finishing. The fixed mold base and guide plate must be connected. When assembling the screw holes and pin holes on the guide plate, the corresponding holes on the die should be used for drilling and reaming; although the type and structural characteristics of the hardware blanking die are not All the same, the assembly method and installation sequence adopted are also different, but the assembly principles should be followed.
Some components that constitute the mold entity are processed into dimensions and tolerances according to the dimensions and tolerances marked on the drawings during the manufacturing process (such as troughs, punching punches, guide posts, guide sleeves, die shanks, etc.). These parts are usually direct mount, some parts are only some sizes in the manufacturing process that can be processed according to the drawings. Need to match the relevant size. Some require mixing or blending prior to assembly, others require mating during assembly. The dimensions marked in the figure are for reference only, such as the die seat guide bushes or guide post fixing holes on the multiple punch fixing plates. Plate bolt holes, pin holes, etc. that need to be connected).
Therefore, the metal stamping die assembly is suitable for centralized assembly, and the repair method and adjustment assembly method are mostly used in the assembly process to ensure the assembly accuracy. In this way, higher assembly accuracy can be achieved, and the standard of parts processing is reduced, thereby achieving the accuracy standard for parts. The technical requirements for metal stamping die assembly are as follows:
1. The precision of the die base should meet the standard requirements (JB/T8050-1999 “Technical Conditions for Die Sets” (JB/T8071-1995) in the relevant die precision testing. The height of the die seal should meet the standards specified in the drawings.
2. For the assembled die, the upper die should slide smoothly and reliably along the guide post and the upper die.
3. The gap between the protruding dies should meet the standard specified in the drawing, and the distribution should be uniform. The working strokes of the convex and concave molds meet the technical requirements.
4. The relative position of positioning and stopper should meet the drawing standard. The distance between the mold guide plates must be consistent with the distance specified in the drawing; the guide surface should be parallel to the center line of the feeding direction of the die; the guide plate is equipped with a side pressure device, and the side pressure plate can slide flexibly and work reliably.
5. The relative positions of the unloading and ejecting equipment should meet the design standards, and there should be no inclination or unilateral deflection in the work to ensure that the parts or wastes are unloaded in time and ejected smoothly.
6. The fastener assembly should be reliable. The length of the bolt thread should not be less than the diameter of the bolt when connecting steel components. When connecting castings, it should not be less than the diameter of the bolt, and the diameter of the bolt should not be less than 1.5 times; The length should be greater than 1.5 times the diameter of the pin; the end face of the pin should not be exposed. The surface of the lower die seat and other parts.
7. The blanking hole or discharge trough should be unobstructed to ensure that parts or waste cannot be discharged at will.
8. Standard components must be interchangeable. The fit of the fixing screws and positioning pins with their holes should be normal.
9. The installation size of the metal stamping die on the press must meet the standard of the selection equipment; the lifting parts must be safe and reliable.
10. The die for metal stamping parts should be tested under manufacturing conditions, and the punched parts should meet the design standards.
The above introduces the relevant assembly and technical requirements of metal stamping dies. Stamping dies are the key equipment for stamping parts processing and have a direct impact on the quality of stamping parts. As the saying goes, if you want to do good work, you must first sharpen your tools before you can produce qualified products. I just hope the above can be of some help to the readers.
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First, the main characteristics of metal stamping parts
1. Metal stamping parts are manufactured under the premise of low material consumption. The parts are light in weight and good in rigidity. After plastic deformation, the internal structure of the metal is improved, and the strength of the stamping parts is improved.
2. The dimensional accuracy of metal stamping parts is high, the size of the same mold is uniform, and the interchangeability is good. Meets general assembly and use requirements without further processing.
3. During the stamping process, since the surface of the material is not damaged, the surface quality is good, and the appearance is smooth and beautiful, which provides convenient conditions for surface coating, electroplating, phosphating and other surface treatments.
1. It is very important to test the first piece of metal stamping parts. In the first process before the mold is ready to be shipped, some stamping parts need to be trial-assembled, so that the relevant accessories can be trial-installed before production.
2. The hardware stamping parts are inspected according to the process time to prevent the variation in the stamping process, such as size problems when the production time is too long, and few holes caused by broken needles of the inserts.
3. Sampling inspection before the metal stamping parts flow into the next process to ensure the qualification of the material again.
The quality of metal stamping parts is very important for the quality of metal stamping parts, which is related to the use effect and longevity of stamping parts. The metal stamping parts mentioned above are the main products of Zhejiang Baifudu Electromechanical Co., Ltd., with many types, good die-casting effect and wide application range.
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1. The influence of mold temperature on injection molding
1. Mold temperature is a variable in injection molding. No matter what kind of plastic is injected, it is necessary to ensure that the surface of the mold is basically wet. The hot mold surface keeps the plastic surface liquid long enough to build pressure within the cavity. Reproduction of the cavity surface is high if the cavity is filled and the cavity pressure can press the soft plastic against the metal before the frozen skin hardens. On the other hand, if the plastic entering the cavity at low pressure is suspended, no matter how short, its slight contact with the metal can cause smearing, sometimes called gate smearing.
2. For each plastic and plastic part, there is a limit on the surface temperature of the mold, beyond which one or more adverse effects may occur (for example: components can overflow burrs). Higher mold temperatures mean less resistance to flow. On many injection molding machines, this naturally means faster flow through gates and cavities, since the injection flow control valve used does not correct for this change, faster filling results in higher efficiency in sprues and cavities pressure.
3. It may cause flash burrs. Since the hotter model does not freeze the plastic that entered the flash edge area prior to high pressure buildup, the melt can flash around the ejector pin and spill into the parting line gap. This shows the need to have good injection rate control, which some modern flow control programmers do.
4. The increase in mold temperature will reduce the condensation layer of plastic in the cavity, making the molten material flow more easily in the cavity, resulting in greater part weight and better surface quality. At the same time, the increase in mold temperature will also increase the tensile strength of the part.
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1. Precautions for precision mold processing
1. The process is concise and detailed, and the processing content is expressed numerically as much as possible.
2. For the key and difficult points of processing, the process should be particularly emphasized.
3. Combination processing is required, and the process is clearly expressed.4. When inserts need to be processed separately, pay attention to the process requirements of processing accuracy.
5. After combined processing, the insert parts that need to be processed separately shall be the benchmark requirements for separate processing of process installation during combined processing.
6. Springs are the most easily damaged in mold processing, so choose mold springs with long fatigue life.
7. High machining accuracy requirements: a pair of molds is generally composed of concave molds, punches and mold bases, and some may also be multi-piece assembled modules. Therefore, the combination of the upper and lower molds, the combination of the insert and the cavity, and the splicing between the modules all require high machining accuracy. The dimensional accuracy of precision molds often reaches μm level.
8. Complex shape and surface: For some products such as car covers, aircraft parts, toys, and household appliances, the shape of the surface is composed of a variety of curved surfaces, so the mold cavity surface is very complex. Some surfaces must be processed mathematically.
9. Small batches: The production of molds is not mass production, and in many cases only one batch is produced.
10. There are many processes: various processes such as milling, boring, drilling, reaming and tapping are always used in mold processing.
11. The use of repeated production molds has a lifespan: when the use of a pair of molds exceeds its lifespan, a new mold must be replaced, so the production of molds is often repetitive.
12. In the production of profiling molds, there are sometimes neither drawings nor data, and profiling should be performed according to the actual objects. This requires high imitation precision and no deformation.
13. Excellent mold material, high hardness The main material of the mold is mostly made of high-quality alloy steel, especially the long-life mold, which is often made of ledeburite steel such as Crl2 and CrWMn.
The above are seven aspects that need to be paid attention to in the process of precision mold processing, so that we can produce high-quality molds, and at the same time, we must meet the processing requirements as much as possible in the selection of machine tools, such as the function of the CNC system should be strong, the machine tool precision should be high, The rigidity is better, the thermal stability is better, and it has the function of profiling.
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Deep drawing is a metal forming process in which parts are produced by stamping sheet metal into molds. It provides high-quality components, is produced quickly, and is often cheaper than other competitive methods. Deep pull parts have numerous applications in many industries such as consumer, medical, military and telecommunications. They can be made from various materials, including brass, stainless steel, alloys, and many others.
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The iron core is an important part of the motor product, generally made of 0.35mm, 0.5mm thick silicon steel sheet. In all aspects of motor production, core punch production is the key. At present, China’s high-speed precision stamping iron chips and iron cores are automatically riveted, Three cores with twisted slot rivets, Iron core with twist groove and rotary rivet, Core double-turn rivets, iron double-row rotary rivets, Large outer rotor core with twisted slot rivets, Stator core semicircle combination riveting, Stator core multi-piece stack riveting, The combination of high-speed precision stamping production technology such as long straight-bar stator core coils and stacking rivets is not inferior to international advanced technology.
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equipped with automatic feeding to improve efficiency. In fact, deep drawing is one of the fastest manufacturing methods in mass production. Deep drawing assemblies can also be created in one piece, reducing the need for additional assembly. This has the added benefit of seamless construction, which is ideal for waterproof or airtight applications.
Deep drawing has high universality, can be used to manufacture complex and fine parts, and has high accuracy and repeatability. More importantly, deep drawing parts have very strong strength because of the great compression applied to the metal during the forming process. The basic structure of the deep drawing metal is usually highly compressed into a very hard crystal structure.
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China Balford's expertise in surface finishing dates back to the company's introduction of electroplating in the 1998's. Since then, the company has leveraged its knowledge in operating these types of unique processes to expand its offering to include decorative and functional coatings. Painting ...
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1. Stamping parts must meet the requirements of product use and technical performance, and be easy to assemble and maintain.
2. Where permitted, stamped parts must help improve material utilization, reduce material types and specifications, and use low-cost materials.
3. In order to simplify the mold structure and optimize the number of processes, the stamping parts must be simple, and there is a simple punching step, that is, to complete the processing of all parts. Try not to use other processing methods that are conducive to stamping operations, easy to organize, and achieve mechanized and automatic production to improve labor productivity.
4. The dimensional accuracy and surface roughness of sleeve pressing parts should be minimized.
5. The design of stamping parts should be processed with existing equipment, process equipment and process flow as much as possible to improve the service life of stamping dies.
Due to the wide application of metal stamping dies, the popularity of stamping parts and changes in processing technology, there are many factors affecting the performance of metal stamping dies. The production process of metal stamping dies mainly includes:
(1), raw materials
(2), mold
(3), punch
There are many kinds of stamping materials, and stainless steel is the most widely used. Most stamped products are made from steel sheet materials through stamping dies. Stamping hardware products can be seen everywhere in our lives.
1. Furniture hardware accessories
2. Home appliance stamping parts
3. Home kitchen supplies
4. Automobile stamping parts
5. Body
6. Chassis
7. Auto booster
8. Car brake pads
9. Radiator
The above molds are all made by stamping. The material requirements for stamping parts are high, such as hardness, strength, tensile, corrosion resistance, surface quality and plasticity, and the accurate thickness is considered.
With the rapid development of the industry, the variety of molds continues to increase, and the mold design is more and more accurate and complex. The qualification rate of stamping parts is closely related to whether the mold design is reasonable. The forming, surface quality, dimensional tolerance and product qualification rate of stamping parts are related to the design of the die process structure. Simply put, the process technology of a product is usually a single process. Multiple process, progressive or compound tooling is available if product processing license is available.
Stamping equipment is the most widely used hydraulic press in the factory. Punch is divided into ordinary punch and high-speed punch. Generally speaking, if most of the processes can solve production problems with high-speed punching or multiple processes, the key factors in making qualified products are advanced stamping equipment and die technology.
The above is the relevant content of the design and processing of metal stamping parts. Under the premise of ensuring factors, the correct use and maintenance of metal stamping dies is also to improve the quality of stamping dies. Because metal stamping dies will shorten the service life of stamping dies if they are used and maintained improperly, regular inspection of abrasive tools can make the processing of stamping parts more accurate. I hope the above will help readers.
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1. Sampling of waste
Refers to other plates other than workpieces during the blanking process of precision stamping parts, including process waste and structural waste. All material contour lines are blanked, and there are process residuals between workpieces and workpieces and between workpieces and strips. Due to the blanking along the closed contour of the blanked part, the quality and die life of the blanked part will be relatively high.
Precision stampings are cut or stamped along the contours of parts of the workpiece and have laps between the workpiece and the workpiece, and between the workpiece and the sides of the strip. The blanking of this method is only a part of the contour of the workpiece, which is affected by the quality of the cut strip, the positioning accuracy and the error. The quality of the blanking parts is slightly poor, but the material utilization rate can reach 70%~90%.
Precision stamping parts have no overlap between the blanking parts and the blanking parts, and between the blanking parts and the sides of the strip. In fact, the blanking parts are obtained by cutting the strip, and the material utilization rate can reach 85%-90%. However, this layout method will make the quality of the blanking parts slightly worse.
Read More →Influence of Necking Process in StampingDuring necking processing, the metal stamping material at the necking end slides into the female die under the pressure of the punch, the diameter decreases, the wall thickness and height increase, and when the wall thickness of the workpiece is not large, it can be approximately considered that the deformation area is in the plane stress state of tangential and radial compression, mainly tangential pressure. The radial compressive strain is the large strain of zui, while the thickness and length directions are elongation, and the deformation in the thickness direction is greater than that in the length direction.
Due to the effect of tangential compressive stress, the billet is prone to instability and wrinkling during necking; At the same time, the cylinder wall in the non deformation area is prone to instability and deformation due to bearing all necking pressure, so preventing instability is the main problem of necking process.
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This industry event in the global attention is prestigious, the annual Sheet Metal,stamping & Metal forming Expo had been successfully completed in 2014 June. The 2015 Organizing Committee will move the event to Shanghai New International Expo Center. This event will ...
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By changing the characteristics of the contacts, the adhesive wear should be reduced to achieve the best results when solving the above problems. Let’s briefly analyze it below.
1. In terms of raw materials for forming workpieces, through surface treatment of the raw materials, such as phosphating, spraying or other surface treatments, a layer of non-metallic molds is formed on the surface of the forming materials, which can greatly reduce or eliminate the strain on the workpiece. This method is costly and requires additional production equipment and increased production processes. Although this method sometimes produces some effects, it is rarely used in actual production.
2. Adding a layer of film such as workpiece and mold PVC between the mold and the molding material can sometimes solve the problem of deep drawing.
For the assembly line passing mechanism, continuous film supply can be achieved. For the periodic production of stamping equipment, each production needs to add a layer of film, which affects the production efficiency. This method is generally more expensive and will generate a large amount of waste. For the production of small batches , Large-sized workpiece, it is best to use this method. For some smaller molding loads, solutions such as adding lubricants or adding EP additive lubricants can be used.
3. The contact characteristics of the stretched materials such as the convex and concave molds are changed by changing the surface treatment of the convex and concave mold materials or the surface treatment of the convex mold and the concave mold, or by selecting the appropriate mold material. Practical applications show that this is a cost-effective way to solve stretching problems.
In short, there are many ways to solve the problem of pulling on the surface of the die and the die. The specific situation should be determined according to the size of the workpiece, the amount of force, the production batch and the type of processing material.
Between the telescopic part and the mold, adding a layer of PVC and other films between the mold and the forming material can sometimes solve the problem of deep drawing.
For the assembly line passing mechanism, continuous film supply can be realized. For stamping equipment with periodic production, a layer of film needs to be added every time a workpiece is produced, which affects the production efficiency. This method is generally more expensive and generates a large amount of waste. For the production of small batches, large size workpieces, this method is best.
In terms of raw materials for forming workpieces, through surface treatment of raw materials such as phosphating, spraying or other surface treatment, a layer of non-metallic molds is formed on the surface of the forming materials, which can greatly reduce or eliminate the strain of the workpiece. This method is expensive, but also It is necessary to add additional production equipment and increase the production process. Although this method sometimes produces some effects, it is rarely used in actual production.
By changing the punch and die material or the surface treatment methods of punch and die, or by selecting appropriate die materials, the contact characteristics of the stretched material such as punch and die can be changed.
Practical applications show that this is a cost-effective solution to stretching problems.
(1), adjust the pressure of the pressing material and reduce the pressure.
(2) Adjust the stretching gap to make the gap larger and make the gap more uniform.
(3), adjust the radius of the die fillet. The corner radius of the die is too small, and the parts are easy to crack. Increasing the corner radius of the die can reduce the degree of cracking.
(4), adjust the punch radius.
(5), adjust the relative position of punch and die.
The above is about the content of the drawing die. The drawing die used is called the drawing die, abbreviated as the die. A drawing die is a special tool required for mass production. The deep drawing die is a very important die, and it is difficult to draw in batches without a qualified die. Advanced drawing processes do not require advanced dies and are therefore not possible. The tension process and the mold, the tension device and the tension material constitute the three elements of the tension process. Only when they are combined with each other can the tension be obtained. I hope the above can be helpful to readers.
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First, the treatment method of mold deformation
1. Reasonable selection of materials. For sophisticated and complex molds, micro-deformation mold steel with good material (such as air-quenched steel) should be selected. For die steel with serious carbide segregation, reasonable forging and quenching and tempering heat treatment should be carried out. For larger and unforgeable die steels, a solution double refinement heat treatment is performed.
2. The mold structure design should be reasonable, the thickness should not be too great, and the shape should be symmetrical. For large deformation molds, the deformation law should be mastered, and machining allowance should be reserved. For large, sophisticated and complex molds, a combined structure can be used.
3. Precise and complex molds should be pre-heated to eliminate residual stress during processing.
4. Reasonable selection of heating temperature and control of heating speed. For sophisticated and complex molds, balanced heating methods such as slow heating and preheating can be used to reduce heat treatment deformation of the mold.
5. On the premise of ensuring the hardness of the mold, try to use pre-cooling, graded cooling quenching or warm quenching process.
6. For sophisticated and complex molds, vacuum heating and quenching and cryogenic treatment after quenching should be used as much as possible.
7. For some sophisticated and complex molds, pre-heat treatment, aging heat treatment, and quenching and tempering nitriding heat treatment can be used to control the accuracy of the mold.
8. When repairing defects such as mold blisters, pores, and wear, use repair equipment with small thermal shocks such as cold welding machines to avoid deformation during the repair process.
In addition, correct heat treatment process operations (such as hole plugging, tying holes, mechanical fixing, appropriate heating methods, correct selection of the cooling direction of the mold and the direction of movement in the cooling medium, etc.) and reasonable tempering heat treatment process also reduce accuracy and Effective measures for complex mold deformation.
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