Zhejiang Balford Mechatronics Co., ltd focus on difficult stamping & deep drawing. Main product: motor housing and difficult custom deep drawn stampings.
By means of the deep drawing processes, carbon steel and stainless steel products are developed by China Balford . Any metal product shape belonging to several sectors can be provided. Thanks to the cold deformation, through the deep drawing process, ...
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1. Analysis of the causes of wrinkling of tensile parts
The way to avoid wrinkling is to ensure that the mold can hold down the material during the stretching process and to ensure a reasonable speed of movement of the sheet. If the sheet moves too fast when the product is stretched, it will cause wrinkling; on the other hand, if the sheet moves too slowly, it will cause the stamping to crack.
1. Select reasonable pressing equipment
When selecting the pressing equipment, the pressing equipment compresses the deformed part of the blank, and has a significant effect on the pressing material to avoid the flange part from arching and wrinkling. Press material should be appropriate. The pressing equipment is divided into two types: elastic pressing and rigid pressing. Elastic equipment is suitable for shallow drawing and rigid equipment is suitable for deep drawing.
2. Reasonable selection of drawbeads
Setting drawbeads on the binder surface is a useful method to control deformation resistance. The drawbead can well adjust the movement of the material, so that the material movement resistance of each part in the drawing process is uniform, so that the amount of material flowing into the cavity meets the needs of the appropriate parts, and avoids wrinkling and cracking. For curved stretched parts with messy shapes, especially those with small flanges, drawbeads should be set to increase the radial tensile stress of stretching and control wrinkling; the setting direction of the drawbeads is in the radial direction. The part with less stress, that is, the part where the sheet is easy to move. For parts with smaller flanges, some materials (process supplementary materials) can be appropriately added in order to set tensile ribs, and this part can be removed when trimming. For drawn parts with large difference in drawing depth, the draw bead should be set in the part with less material feed, so that too much material in this part can be arranged to be pulled into the cavity of the die to avoid wrinkling.
There are many reasons for the wrinkling of the stretched parts during the stretching process, the main reasons are as follows:
1. The drawing depth of the stamping part is too deep, which causes the sheet to move too fast during the feeding process, causing wrinkles.
2. The R angle of the die of the stamping part is too large during the stretching process, which leads to the fact that the punch cannot press the material during the stretching process, resulting in the sheet material moving too fast and causing wrinkles.
3. The pressing ribs of stamping parts are unreasonable, the pressing ribs are too small, and the direction is incorrect, which cannot effectively prevent the sheet material from moving too fast, causing wrinkling.
4. The pressure of the ejector is too small, so that the stamping parts are not formed completely and wrinkle is formed.
The above is the relevant content about the reasons for the wrinkling of stamping products. Of course, the wrinkling of products may also be due to problems with the parameters in the production process, and the parameters need to be redesigned. There are many reasons for product wrinkling. To prevent the cause of wrinkling, we can also check the origin.
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1. What are the main points of hardware accessories processing?
1. The machining accuracy of the parts changes due to internal force. Skilled workers know that during machining, the part is clamped by the three jaws of the lathe to ensure that the forces the part is subjected to during machining are stable over time. It will loosen the lathe chuck, reduce the force on the part and cause deformation.
2. Deformation easily occurs during heat treatment. When machining some thin and small parts, it is usually necessary to heat treat them first. At this time, if the professional knowledge of the technicians is not solid and the structural performance of these parts is not well understood, it is easy to cause the parts to bend.
3. The parts are elastically deformed under the action of external force. When machining parts, lathes and fixtures are often used. When the two are not uniform, the uneven force on the fixed parts will occur, and the deformation will occur when the force is small.
1. After the parts are heat treated and deformed naturally, they are trimmed with professional cutting tools to ensure the perfection of the parts.
2. Carry out technical transformation to improve the rigidity of components.
Technicians need to improve the process, increase innovation, select the appropriate heat treatment method, change the stiffness of the parts, so that the parts are not easily deformed.
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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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1. Deformation characteristics of cylindrical parts.
In the process of sheet stretching, the deformation area is the edge part of the sheet, and the other parts are the transmission area, which does not participate in the main deformation; under the action of tangential pressure and radial tensile stress, the blank produces tangential compression under certain conditions And the radial extension is always under tension and is always limited by compression deformation parameters and ultimate deformation performance.
The deformation characteristics are the same as for the cylindrical simple part. The difference is that the shape is always under tension and always under compression, and the distribution around the blank is uneven, the rounded corners are deformed greatly, and the straight edge is less deformed; around the blank, the parts with a large degree of deformation and a small degree of deformation affect each other.
The outer perimeter of the blank is the deep-drawing deformation zone that is always under tension and always under compression; the middle part of the blank is the bulging zone of bidirectional tensile stress.
The deformation area of the flange blank consists of an epitaxial deep drawing deformation area and an inner bulging deformation area, but these two deformations are unevenly distributed around the blank; when the curved convex edge part is deep drawn, there is still shear deformation.
The above content about the shape of the parts processed by the drawn parts, no matter what kind of parts are processed, the quality of the drawn parts is an important issue that cannot be ignored. High-quality stretched parts should be made of high-quality metal or non-metallic plates; secondly, the surface of the raw materials should not be damaged during stamping; one point is that a high-quality stretched product must have high dimensional accuracy. I hope the above content can be helpful to readers.
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In the process of automobile stamping parts, the pulling of the mold is mainly forming, drawing and other processes. Find the corresponding position according to the pulling position of the part, and use the oil stone to remove the burr, but pay attention to the uniformity of the rounded corners.
Due to the presence of burrs in automotive stampings, it is usually caused by excessive die clearance. It can be adjusted according to different types of molds and gap sizes to ensure that the size of the parts remains unchanged before and after repair, and at the same time, it can solve the burr problem.
The deformation of the blanking die in the production process, especially the deformation of the appearance parts, has a great impact on the quality of the product. Generally, it can be solved by increasing the blank holder, which is the right remedy.
During the punching process, the waste blocks the customized die holes of automobile stamping parts, which may be because the waste channel is not smooth, or the material channel has a taper, and the waste is not cleaned in time. Based on these three points, cleanup and improvements can be made.
When designing automotive stamping products, it should meet the requirements of use and technical performance to facilitate mold assembly.
Automobile stamping parts must adopt a plan to improve material utilization and reduce material loss, so that stamping parts can be as zero or less scrap as possible.
Design a simple form, reasonable structure, simple and easy process, avoid repeated use of other processing methods, which is conducive to stamping; try to use automatic stamping to improve production efficiency.
Automatic stamping parts, try to use the existing equipment and technology for processing, which is conducive to improving the life of the stamping die.
The automotive stamping parts industry adopts a large number of cold stamping processes to meet the requirements of multi-variety and mass production. For medium-sized cars, most of the covering parts, such as body outer panels, and some load-bearing and support parts, such as frame, automotive stampings and other auto parts.
Automobile stamping parts show that the steel used for cold stamping is mainly steel plates and steel strips, accounting for 72.6% of the whole vehicle. Cold stamping materials are closely related to the processing of automobile stamping parts. The quality of the material not only determines the performance of the product, but also directly affects the quality and cost of the product. Therefore, the rational choice of material selection is an important and complicated work.
1. Check the wrinkling state. When the crease is evenly generated around the part, it should be determined that the pressing force is insufficient, which can be eliminated by gradually increasing the pressing force. When drawing conical and hemispherical parts, the drawing bead should be added to increase the tensile stress in the diameter of the plate and eliminate wrinkles. Adopt the principle of external looseness and internal tightness to eliminate the problem of internal looseness and external tightness.
2. For lubricating oil, the oil brushing operation should be carried out in accordance with the requirements of the operating procedures system to ensure that the oil brushing and oil brushing position are correct and avoid wrinkling.
3. Under the premise of not affecting the requirements of the whole vehicle, replace the material of the parts with too soft blanks to ensure the quality of the parts and prevent wrinkling.
4. Improve the positioning and increase the pre-bending process if necessary to ensure that the stamping parts will not deviate. Adjust the shape of the sub-material surface to ensure the molding quality and prevent the shape of the pressing surface from not moving, resulting in uneven feeding.
5. For incorrect punching direction, use simulation software to analyze the punching process in the early stage of design to ensure the punching direction. When there are certain requirements for the quality of the die, it is necessary to improve the die.
The above is the relevant content of automobile stamping parts processing molds. During the processing of automobile stamping parts, the molds should be subjected to loads such as shock, vibration, friction, high pressure, stretching, and bending torque. Even if they work at high temperatures, the working environment is complex and easy to wear. Fatigue, fracture, deformation, etc. Therefore, the material requirements for mold work are higher than ordinary parts. Hope the above content can be helpful to readers.
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The molds used in stamping processing are generally specialized. Sometimes a complex part needs several sets of molds to be processed and formed, and the mold manufacturing has high precision and high technical requirements, which is a technology-intensive product. Therefore, only in the case of large production batches of stamping parts, the advantages of stamping processing can be fully reflected, so as to obtain better economic benefits.
Of course, stamping also has some problems and disadvantages. It is mainly manifested in the noise and vibration generated during the stamping process, and the operator’s safety accident occurs from time to time. However, these problems are not entirely caused by the stamping process and the mold itself, but are mainly caused by traditional stamping equipment and backward manual operations. With the advancement of science and technology, especially the development of computer technology, and the advancement of mechatronics technology, these problems will definitely be solved as soon as possible.
Compared with other methods of machining and plastic working, stamping has many unique advantages, both technically and economically. The main performance is as follows.
(1) The production efficiency of stamping processing is high, and the operation is relatively convenient, and it is easy to realize mechanization and automation. This is because stamping relies on punching dies and stamping equipment to complete the processing. The number of strokes of ordinary presses can reach dozens of times per minute, and the high-speed pressure can reach hundreds or even thousands of times per minute. May get a punch.
(2) During stamping, since the die ensures the size and shape accuracy of the stamping parts, and generally does not damage the surface quality of the stamping parts, and the life of the die is generally long, the quality of the stamping is stable, the interchangeability is good, and it has “exactly the same”. “Characteristics.
(3) Stamping can process parts with a wide range of sizes and complex shapes, such as stopwatches as small as clocks, as large as automobile longitudinal beams, covering parts, etc., plus the cold deformation hardening effect of the material during stamping, the strength of stamping and stiffness are high.
(4) Stamping generally does not generate chips and scraps, consumes less material, and does not require other heating equipment, so it is a material-saving and energy-saving processing method, and the cost of stamping parts is low.
1. Ordinary cold-rolled sheet spcc spcc refers to the continuous rolling of steel ingots into steel coils or sheets of required thickness through a cold rolling mill. There is no protection on the surface of spcc, and it is easily oxidized when exposed to the air, especially in a humid environment, the oxidation speed is accelerated, and dark red rust appears.
⒉. The base material of galvanized steel sheet secc secc is a general cold-rolled steel coil, which becomes an electro-galvanized product after degreasing, pickling, electroplating and various post-treatment processes in a continuous electro-galvanizing production line. secc not only has the mechanical properties and approximate processability of ordinary cold-rolled steel sheets, but also has superior corrosion resistance and decorative appearance. It has great competition and substitution in the market of electronic products, home appliances and furniture. For example, the commonly used computer case is SECC.
3. Hot-dip galvanized steel sheet sgcc Hot-dip galvanized steel coil refers to the semi-finished product after hot-rolling pickling or cold-rolling, after cleaning, annealing, and immersing it in a molten zinc bath with a temperature of about 460 ° C, and making the steel sheet plated. The upper zinc layer is then tempered, leveled and chemically treated. The sgcc material is harder than the scc material, has poor ductility (avoid deep drawing design), thicker zinc layer, and poor weldability.
4. The content of stainless steel sus301 cr (chromium) is lower than that of sus304, and the corrosion resistance is poor, but after cold working, it can obtain good tensile force and hardness, and has good elasticity. It is mostly used for shrapnel springs and anti-EMI.
5. Stainless steel sus304 One of the most widely used stainless steels, because it contains ni (nickel), it is richer in corrosion resistance and heat resistance than steel containing cr (chromium), has very good mechanical properties, and has no heat treatment hardening phenomenon. There is no elasticity.
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After stamping and producing qualified samples, the performance and forming conditions of the mold have mastered the methods and rules of the product parts during the stamping process, which provides a reliable process design basis for the mass production of the mold. In the production of cold stamping dies in metal stamping parts factory, it is difficult to accurately calculate the size and shape of the blank before the blank is deformed, such as deformation, stretching, forming, cold extrusion and other product parts with complex shapes or high precision requirements. In order to obtain more accurate blank shape dimensions and material standards, qualified parts can only be determined by repeatedly debugging the mold.
In die design and process design, it is difficult to determine some process dimensions by calculation methods, such as complex protrusions of deep drawing die, rounded corners of concave die, geometry and size of certain parts. The metal stamping parts factory must carry out test punching and trimming at the same time, and the shape and size of the parts can only be determined after the qualified parts are punched out. After debugging, the problems, debugging and solutions exposed in the process, mold design and manufacturing are fed back to the relevant design and process departments to provide reference for the next design and manufacturing, and improve the level of mold design and processing. The metal stamping parts factory verified the quality and precision of the mold through the mold test, which provided the basis for future production.
The above is why metal stamping dies need to be tested before use. I hope it helps you. If you want to know more about stamping die, you can also pay attention to our website, we will update the information of stamping die from time to time!
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1. In the process of sheet metal processing, sometimes there are too many redundant materials, and redundant materials often appear in the closed position of multiple bending edges. This is usually due to a process error or a drawing error.
2. The bending machines of some sheet metal cabinet processing manufacturers have restrictions on bending, which are mainly reflected in the height of one side and two sides. The height of one side is limited by the size of the bending machine and the height of the upper cutter. The solution is to use a large-angle polygonal bending; but the height of both sides is not greater than the height of one side, and it is also limited by the bottom edge: bending The height should be less than the bottom edge.
3. Pay attention to the edge of the sheet metal after bending. If left untreated, it will affect the strength of the sheet metal. Mainly by welding.
4. Due to the thin plate material of sheet metal parts, it is not suitable for hot-dip galvanizing. Common surface treatment methods include phosphating and electrostatic powder spraying, which are surface treatment procedures for sheet metal parts.
The above four points are the matters that sheet metal cabinet manufacturers need to pay attention to in the processing process. If you want to do a good job of sheet metal processing, you need to pay more attention to each process. Pursue better quality and provide customers with high-quality products.
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Today, deep drawing parts are widely used in all areas of our lives. In order to properly prolong the service life of drawn stampings, careful maintenance is required. So, what should be paid attention to when maintaining it? The following Zhejiang Baifudu Electromechanical editor will take you to understand!
Before installation and use of stretch stamping parts, the stamping parts should be strictly inspected and the dirt should be removed, and the guide bushes and dies of the stamping parts should be carefully checked whether they are well lubricated.
According to the installation steps of the stamping die, install the stamping die and the stamping die on the turntable to ensure that the direction of the stamping die and the stamping die are consistent, especially the stamping parts (non-circular and square) with the required direction are larger. Take care to prevent assembly errors and gaps.
When the edges of the punch and the die of the stamping part are worn, it should be stopped in time for grinding. Otherwise, the degree of die edge wear will rapidly expand, the die wear will be accelerated, and the quality of stamping parts and die life will be reduced.
Regularly check the turntable of the punch and the mounting base of the die to ensure the coaxial accuracy of the upper and lower turntables.
When installing the mold, the press mold should be made of soft metal (such as copper, aluminum, etc.) to make operating tools to avoid damage to the tension part during installation.
To ensure the service life of the stretch stamping parts, the spring of the mold should be replaced regularly to prevent the spring fatigue damage from affecting the use of the stretch stamping parts.
The service life of stretch stamping parts depends not only on reasonable die structure, superb manufacturing accuracy, good heat treatment effect, and the correct selection of punches and the installation accuracy of stretch stamping parts, but also on the correct use, maintenance and maintenance of the die. Therefore, we must eliminate the adverse effects of various factors on the service life of drawing and stamping parts, and take effective measures to improve their service life.
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The blank holder of the metal stamping die is a pressing device mainly used to prevent the wrinkling of the stamping and drawing products in the drawing process. Variable blank holder control through blank holder can greatly reduce the cost and has strong practicability. The following is a brief introduction to the blank holder by the hardware stamping parts manufacturer.1. The blank holder is a kind of pressing part on the die used for metal stamping and drawing, which is used to prevent the wrinkling of the workpiece wall or flange during the drawing.
2. Structure
It mainly includes the upper layer, small top pillar and lower layer. The upper layer is elastic material, the upper layer is in contact with the flange area of the slab blank, and the lower layer is connected with the top bar. A number of small top pillars are embedded between the upper layer and the lower layer through the sink. There is a small length difference between the small top pillars, generally 0.1mm. According to the actual needs, different numbers and lengths of small top pillars are embedded in different areas.
3. Two kinds of common blank holder
(1) Elastic blank holder is divided into spring pad, rubber pad and air cushion blank holder of the press itself, which is used for processing shallow drawing parts;
(2) The rigid blank holder is applicable to the stretching or forming of large pieces with large height.
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Although it can be modified to make specific parts, our deep drawing stamping process typically follows the same five steps:1.Design Review:Our engineers review the part design in detail to ensure it is suitable for deep drawing stamping. This includes in-depth analysis of component dimensions, materials, draw ratio, and required tolerances.
2.Press Selection: Our engineers determine which machine size and caliber will best suit the size and material of the part.
3.Virtual 3D prototyping: A prototype of the part is created using virtual software. The prototype is run through numerous operational simulations to catch any design problems before the production process begins.
4.Equipment setup: Our skilled engineers review component dimensions and requirements and set die and punch.
5.Deep Draw Process: The sheet metal, or metal blank, is placed on the die and secured. The press is then activated to force the punch against the die with up to 400 tons of force. The process is repeated until the component reaches the desired size and shape.
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1. Stainless steel stamping and drawing parts
Stainless steel tensile parts have the characteristics of high strength, light weight, good wear resistance, and high corrosion resistance. The tensile parts of this material do not require electroplating protection. It is suitable for heat treatment and is often used in fuel systems, braking systems, exhaust systems, oxidation sensors and decorative parts in automobile manufacturing.
Low carbon steel has the characteristics of excellent formability, stable forming dimensions, high strength, and light weight (see material grade for details). It is often used in various parts in automobile manufacturing, especially high-strength mechanism parts.
The characteristics of aluminum alloy tensile parts are: light weight (almost 1/3 of low carbon steel), high strength, non-magnetic, stainless rust, anodized anti-corrosion, suitable for heat treatment, etc., and are often used in bulk in automobile manufacturing and other industries. devices, energy storage devices, beverage containers and the pharmaceutical industry.
Copper alloy drawing parts have the characteristics of stable forming dimensions, corrosion resistance, good ductility, and easy welding. The disadvantage is that they are easy to oxidize. Due to the high price of copper alloy materials, waste needs to be reduced and recycled if necessary.
The above is related to the processing materials of stamping and drawing parts. In general, the machining methods for machining parts from different materials will vary. Material properties and processing characteristics should be considered to avoid losses. Hope the above content is helpful to readers.
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1. Design principles of precision die structure
1. According to the production batch of stamping parts, determine whether to use a simple die structure or a complex die structure. Generally speaking, a simple die structure has a short life and low cost, and a complex die structure has a long life and high cost. Therefore, if the number of stamping parts is small, it is more suitable to use a simple die structure. Larger quantities are more suitable for conventional die structures with longer service life.
2. The accuracy level of the stamping die is determined according to the size requirements of the stamping parts. If the dimensional accuracy and section quality of the stamping parts are high, the precision stamping structure should be used, and the stamping parts with general precision requirements can use the ordinary stamping structure.
3. Select the type of stamping die according to the capability of the existing equipment. For example, when drawing workpieces, a double-action die structure is much better than a single-action die structure.
4. The type of unloading device in the die structure is selected according to the thickness of the stamping plate. For example, when blanking thick plate workpieces, if the requirements for surface straightness and sharpness are not high, a fixed unloading device can be selected. Suitable for selection.
5. Select the mold type according to the technical conditions and economy of mold manufacturing. For example, when the technical requirements of die manufacturing are low, a simple die stamping structure should be designed as much as possible. When the variety of mold equipment is complete and the machining accuracy is high, in order to improve the service life of the mold and achieve mass production, a more complex precision mold stamping structure should be selected.
Designers should consider a variety of factors when choosing a die structure. Because simple stamping dies and general traditional stamping dies have their own advantages and limitations. This requires analysis and comparison to make the selected stamping die structure mode as reasonable and reliable as possible.
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All kinds of stamping parts can be seen everywhere in our daily life. Many domestic manufacturers have clearly seen the huge potential of the stamping market, and continue to increase their investment in the stamping market, which has effectively improved the quality of my country’s stamping products, so that they can meet the needs of the market. In the face of products produced by many manufacturers, how to choose is a headache for consumers, and which is better for high-quality stamping parts processing is a topic of concern.
When evaluating which manufacturer of metal stamping parts has better quality, the first thing to look at is the quality of the manufacturer’s products. Whether the manufacturer can produce in accordance with the relevant regulations in the production process, whether the product quality meets the relevant regulations and other related issues are all important evidences for measuring a manufacturer. When selecting, professional manufacturers let us consider the first time.
All kinds of stamping parts can be seen everywhere in our daily life. Many domestic manufacturers have clearly seen the huge potential of the stamping market, and continue to increase their investment in the stamping market, which has effectively improved the quality of my country’s stamping products, so that they can meet the needs of the market. In the face of products produced by many manufacturers, how to choose is a headache for consumers, and which is better for high-quality stamping parts processing is a topic of concern.
When evaluating which manufacturer of metal stamping parts has better quality, the first thing to look at is the quality of the manufacturer’s products. Whether the manufacturer can produce in accordance with the relevant regulations in the production process, whether the product quality meets the relevant regulations and other related issues are all important evidences for measuring a manufacturer. When selecting, professional manufacturers let us consider the first time.
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