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

  • Chip jumping and crushing in progressive die stamping

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    Today, we are going to talk about a very common bad situation in progressive die stamping — chip jumping and crushing. What are the reasons for this, and what effective solutions can be taken to avoid affecting the quality and production efficiency of metal stamping products and causing losses to stamping manufacturers.1. Reasons

    (1) The clearance is too large;

    (2) Improper feeding;

    (3) Punching oil drops too fast, and the oil is sticky;

    (4) The punch is worn and chips are pressed on the punch;

    (5) The punch is too short, and the length of inserted die is insufficient;

    (6) The mold is not demagnetized;

    (7) Hard material, simple punching shape;

    (8) Emergency measures.

    2. Solutions

    (1) Control the machining accuracy of punch and die or modify the design clearance;

    (2) Trim the tape and clean the mold in time when it is sent to the proper position;

    (3) Control the oil drop amount of stamping oil or change the oil type to reduce the viscosity;

    (4) Studied the punch edge;

    (5) Adjust the length of the punch edge into the die;

    (6) Demagnetization is required after mold and research;

    (7) Replace the material, modify the design, install ejecting or trim the inclined plane or arc (pay attention to the direction) on the end face of the punch edge, and reduce the fitting area between the end face of the punch edge and the scrap;

    (8) Reduce the sharpness of the die edge, reduce the amount of research and study on the die edge, increase the roughness of the straight edge surface of the die, use a vacuum cleaner to absorb waste materials, reduce the impact speed, and slow down chip jumping.

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  • 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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  • 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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  • Possible causes of metal stamping die cracking

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    Stamping die is a necessary condition for metal stamping parts processing. A good metal stamping die is beneficial in all aspects, such as service life, product quality, production efficiency, etc. In the process of stamping, the problem of die cracking will occur. Now, Zhejiang Yiwei Precision, a stamping parts manufacturer with 36 years of experience, will introduce the possible causes of metal stamping die cracking.1. Poor mold design scheme and stamping process design

    The compressive strength of the metal stamping die is insufficient, the knife edge spacing is too close, the die design is unreasonable, the number of template blocks is insufficient, and there is no cushion block.

    2. Poor blanking during metal stamping production and processing

    There is no demagnetization solution and no return tip before metal stamping production; There are broken needles, broken springs and other materials stuck in the production process; There is no leakage hole when assembling the mold, which will cause poor blanking.

    3. Poor quenching and tempering of mold materials

    Deformation caused by poor heat treatment and quenching process.

    4. Improper wire cutting

    The metal stamping die tooth surface is mostly processed by wire cutting. Due to its thermoelectric effect and electrolysis effect, the surface layer appears mildewed layer, which leads to the reduction of surface layer strength, cracks, etc., leading to early damage of metal stamping dies processed by wire cutting. Therefore, effective electrical specifications should be selected to avoid the deep layer of mildewed layer as much as possible.

    5. Unreasonable selection of stamping equipment

    Tonnage of high-speed punch, insufficient cold punching pressure, and too deep die setting. The precision and stiffness of stamping machine tools are very important to the service life of stamping dies.

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  • The stamping factory does this to reduce the scratch on the surface of metal stamping parts

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    When there are scratches on the surface of metal stampings, the appearance of the products is poor, which will also affect the quality and service life of the stampings. In serious cases, they need to be scrapped, causing great losses. So how can we effectively avoid this problem? By doing so, the stamping factory can reduce the surface scratches of metal stamping products!

    • Reduce the roughness of blank holder surface or die fillet;
    • Replace the scratched stamping materials; Normalize the excessively soft metal materials;
    • Eliminate the excessive gap on the joint surface of the die insert;
    • If the scratch is caused by improper drawing direction, change the drawing direction,
    • Clean the blank surface of the stamping part on the working surface of the die before stamping;
    • Improve die hardness and replace die materials;
    • Increase or even the die clearance.

    The above contents will be shared here. In a word, specific problems should be analyzed and improved accordingly.

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  • Reasons for smaller or larger inner diameter of drawing parts

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    When the hardware stamping parts manufacturer is carrying out the stamping and stretching process, the inner diameter of the stamping and stretching parts obtained is too small or too large, resulting in unqualified products. What is the reason for this? Learn about it with Xiao Bian.

    1. The inner diameter of the stamping stretching part is too small:

    A. Insufficient output at the top;

    B. The hydraulic oil temperature is too high or the hydraulic machine leaks oil;

    C. The stretching material is too thick.

    2. The inner diameter of the stretching piece is too large:

    A. Excessive jacking force;

    B. Wear of drawing die;

    C. The material thickness of the stretching material is too thin.

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  • Key Points for Use of Continuous Stamping Die

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    The manufacturers of precision stamping parts choose to use the continuous stamping die when stamping, which has the advantages of high mass production efficiency, easy to realize automation, and low cost. At the same time, we should not forget the key points of using the continuous stamping die to avoid affecting the quality of stamping products and the service life of the stamping die.1. The metal stamping parts need to be suitable for continuous die stamping. First, the batch size should be large enough, the feeding accuracy and the cumulative error between each work step should be designed reasonably, and the accuracy of the parts should not be reduced. The parts with complex shape and difficult to locate after punching are usually stamped with continuous die, which is ideal for z;

    2. The press used for the continuous die should have sufficient strength, stiffness, accuracy and other factors, and the stroke should not be too large to ensure that the guidance system does not disengage during operation, generally working at less than 80% of the nominal pressure;

    4. Stamping materials should have good mechanical properties. Each batch of incoming materials should be inspected and tested according to the regulations. Only when the materials are straight can they be put into production. The quality of materials directly affects the production of metal stamping parts;

    3. Key points of design, manufacture and maintenance of continuous die for metal stamping parts. Due to the complex structure of the continuous die, its manufacturing accuracy is higher than that of general dies. After each batch of production, inspection and maintenance are required. Only qualified parts can be put into the die warehouse. Some small accessories and inserts need to be replaced in time after wear; If the mold has been ground, the corresponding other parts should also be ground equally to ensure the same height, which is required to be consistent with the relative difference of the original design. Therefore, the level of the mold workers and special equipment should also be equipped.

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    Hardware stamping parts are metal stamping parts produced and processed by using a punch and a stamping die. Obviously, the stamping die is very important in the stamping process. Today, our stamping parts manufacturer will talk about the knowledge that the stamping die does not peel off. What are the specific reasons? There may be insufficient avoidance at the forming place;

    The forming slider does not fit smoothly;

    Improper positioning or feeding;

    The inner part of the mold is strained, resulting in the unsmooth stamping activity;

    The layout of ejector pin is unreasonable;

    Insufficient ejection or stripping force;

    Punch bar is strained or the surface is not smooth;

    The uneven force on the striking plate causes the tilting of the striking plate;

    The punch does not fit well with the punching part

    The punch is too long or the ejector pin is not long enough;

    The cutting edges of the male die and female die of the die are worn, the rear angle of the female die is too small, and there is too much material in the cavity of the female die;

    The template is not demagnetized, and the workpiece is brought up;

    The late deformation is caused by improper heat treatment.

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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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  • Deep Drawing & Metal Fabrication

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    China Aluminum Company is a leading manufacturer of deep drawn parts, including cylinders, enclosures and irregular shapes. We maintain a vertically-integrated facility with on-site engineering, designing, and prototyping services. Over the last 20 years, we’ve earned a reputation for producing highly complex, yet cost-effective, deep drawn parts.

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  • Production quality control of metal stamping parts

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    The application of metal stamping parts is very extensive. With the development of science and technology, the requirements for metal stamping parts are also increasing. In order to obtain high-quality stamping products and economic benefits, stamping manufacturers should strictly control the production quality of stamping parts. Now let’s look at the quality requirements for bending […]

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  • Problems easily occurred in drawing process of stamping parts

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    Due to the different shapes and sizes of products in the process of stamping, different stamping processes are required, and deep drawing is one of them. In the actual production of deep drawing, some problems are easy to occur, which affect the product quality and processing efficiency. Please refer to the following points for specific problems.1. The wear of the die will cause the inner diameter of the stretching piece to be too large

    2. Excessive jacking force will cause larger inner diameter; Insufficient will cause the inner diameter of the stretching piece to be smaller

    3. The inner diameter of the stretching piece will be larger if the stretching material is too thin; Too thick will lead to smaller inner diameter

    4. Too high temperature or oil leakage of the hydraulic oil used for deep drawing will cause the inner diameter of the stretching piece to be too small

    5. The mouth of the stretch piece is easy to wrinkle

    6. The stretching piece is strained

    7. There are gouges and bruises on the appearance of the stretching piece

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    The application of metal stamping parts is very extensive. With the development of science and technology, the requirements for metal stamping parts are also increasing. In order to obtain high-quality stamping products and economic benefits, stamping manufacturers should strictly control the production quality of stamping parts. Now let’s look at the quality requirements for bending parts and stretching parts.1、 Requirements for bending parts

    1. The shape of bending parts shall be symmetrical as far as possible, and the bending radius shall not be less than the allowable z small bending radius of materials.

    2. Avoid hole deformation when bending punched parts with holes

    3. The curved edge is too short to be formed, so the straight part of the curved edge should be H>2 δ。 If H is required to be very short, an appropriate allowance shall be reserved to increase H, and the added metal shall be cut after bending.

    2、 Requirements for stretch pieces

    1. The shape of the stretching piece shall be simple and symmetrical, and the depth shall not be too large. In order to reduce the number of drawing, easy to shape.

    2. The fillet radius of the extruded part shall not be increased without adding the process procedure. Otherwise, it will increase the times of drawing and shaping, increase the number of molds, and easily produce waste products and increase costs.

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  • Problems easily occurred in drawing process of stamping parts

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    Due to the different shapes and sizes of products in the process of stamping, different stamping processes are required, and deep drawing is one of them. In the actual production of deep drawing, some problems are easy to occur, which affect the product quality and processing efficiency. Please refer to the following points for specific problems.

    1. The wear of the die will cause the inner diameter of the stretching piece to be too large
    2. Excessive jacking force will cause larger inner diameter; Insufficient will cause the inner diameter of the stretching piece to be smaller
    3. The inner diameter of the stretching piece will be larger if the stretching material is too thin; Too thick will lead to smaller inner diameter
    4. Too high temperature or oil leakage of the hydraulic oil used for deep drawing will cause the inner diameter of the stretching piece to be too small
    5. The mouth of the stretch piece is easy to wrinkle
    6. The stretching piece is strained
    7. There are gouges and bruises on the appearance of the stretching piece
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  • Why the surface quality of metal stamping parts is poor

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    Why is the surface quality of metal stampings poor? There are many reasons for the surface quality problems of stamping parts. For example, the surface quality of coils, sheets and molds will affect the quality of the final stamping parts. The operation during the stamping process and the clamping, taking and unloading of station instruments may also damage the surface quality of the parts. Therefore, the details should be fully considered in each link of the entire manufacturing process to avoid quality problems and affect the final product appearance.

    Common undesirable phenomena of coiled materials mainly include the following aspects:

    1. There are foreign matters on the surface or inside of the steel plate;

    2. The foreign body peels off, and the coiled material is in scar like state; Poor coiled material

    3. The edges and corners of the coil are damaged;

    4. The corner (20~30mm) is deformed or wrinkled due to uneven stress;

    5. Scratches (caused by roller surface or foreign substances);

    6. Caused by roller sliding;

    7. Irregular edge damage;

    8. After foreign matters enter, press out the bulge on the back of the coil (foreign matters will disappear if dropped);

    9. Roller trace (caused by foreign matters attached to the roller);

    10. Poor materials beyond the rules;

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