Balford News

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

  • Four common shapes and characteristics of parts in the processing of drawing parts

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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.

    2. The deformation characteristics of the box.

    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.

    3. Deformation characteristics of surface parts.

    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.

    4. Deformation characteristics of non-rotating surface parts.

    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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  • How to solve common problems in drawing parts processing?

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    The drawing process is a commonly used processing method in machining and production. However, in the actual operation of many factories, it is found that the molds for drawing parts are easily pulled. We should change our approach. Below, Zhejiang Baifudu Electromechanical will introduce the relevant knowledge to you. For the above problems, the adhesive wear should be reduced and the characteristics of the contact pair should be changed before the realization. Let us briefly analyze how to solve common problems in the processing of drawing parts?

    1. In terms of original data, after surface treatment of the original data, such as phosphating, spraying or other appearance treatment, a non-metallic mold layer is formed on the appearance of the forming data, which can greatly reduce or eliminate the strain on the workpiece. . This method is usually expensive and requires additional production equipment and production processes. Although this method sometimes has certain effects, it is rarely used in actual production.

    2. Adding a layer of metal workpiece and mold PVC film between the mold and the forming data can sometimes deal with the stretching problem of the workpiece. In terms of production line organization, in terms of continuous supply of film, in terms of cycle production, each workpiece needs to add a layer of film to affect the production speed. This method is generally expensive and generates a large amount of waste. This method is desirable for the production of small batches of large workpieces. When some forming loads are very small, the problem of workpiece strain can be solved by adding lubricating oil or adding lubricating oil EP lubricant.

    3. Modify the die convexity, the concave die data or the surface treatment of the convex and concave die or select the appropriate die data, so that the contact properties of the tensile data like the convex and concave die have changed. From a practical point of view, this is an economical and practical treatment method and has been widely used. In short, there are many ways to deal with the surface strain of deep-drawn parts and punches. The specific method should be determined according to the size of the workpiece and the load to determine the type of processing materials used in the production batch.

    The shape of the drawing workpiece is complex and diverse, and the dimensional accuracy is high. The processed product is equal to the cut product. The machining section is very flat, smooth and bright, which is more difficult than other machining processes. High-precision fine-blanking gears can fine-blank gears, and the drawn parts have clear contours and small depression angles. In the process of processing, the drawing parts mainly rely on the press pressure to stamp metal or non-metal materials. During the processing of drawn parts, the precision of the workpiece is very high, which can reach the micron level. Compared with other processed parts, this product has significant advantages such as lightness, thinness, uniform distribution, and pressure resistance. In the process of processing, it can be mass-produced, shorten the processing time, one-time molding, without other processing. This product is mainly used for automobile handbrakes, cars, motorcycles and other products. It is an economical and efficient electromechanical component.

    Next, we’ll educate you about stretched pieces so you can understand them clearly by learning. In this way, you can add some expertise to the products on this website.

    1. Is blanking-drawing suitable for shallow drawn parts or deep drawn parts?

    Blanking-drawing is suitable for shallow drawing, because the steel plate is pressed when blanking, and the steel plate is also pressed when deep drawing. Therefore, on this basis, there will be the above-mentioned corresponding theories. There is no doubt about that.

    2. How to wire the tie rod?

    In this case, in the eyes of Zhejiang Baifudu Electromechanical Manufacturer, it cannot use the ordinary thread rolling method because it is not applicable, but first thread a mandrel on the tie rod, and then carry out the thread rolling operation to complete the smooth operation. Work.

    3. How to prevent the problem of pulling the rod?

    In order to prevent the problem of drawing hair, the methods we can take may be aspects that we should pay attention to, mainly including the following aspects:

    (1) The appearance of the die used should be smooth, and smooth work should be done during deep drawing;

    (2) The hardness of the mold material is too low.

    (3) Third, do a good job of cleaning the stretched parts, and there should be no dust and dirt on it.

    For stretched parts, it can be said that the above problems are very important and basic, and there is no such thing, so I hope you can study and understand carefully so that you can master it in time, so that you can have new harvests, and the products have some development and development in the process of learning. Breakthroughs can also prevent yourself from not harvesting.

    I hope you can take and solve the above problems seriously, and know how to solve the above problems correctly, so that even if you encounter them in actual work, you can deal with them calmly, solve them in time, and avoid some unnecessary problems or troubles. Hope it will be useful to readers.

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  • How to solve the tensile cracking in the processing of stainless steel stamping parts?

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    When the stamping part of stainless steel plate is cracked, there are four kinds of situations that often occur. There are four kinds of such situations. They occur immediately after the tensile deformation and exit from the stamping part. After the drawing deformation, shock or vibration occurs. Will appear for a while or in use. The cause of lateral cracks or point cracks in the sidewall of stainless steel stamping parts may be caused by material inclusions, ferrite and other intergranular defects, or it may be the deep drawing process and deep drawing cracks that occur during the processing of stainless steel stamping parts and other reasons.

    The transverse cracks or point cracks on the side walls of stainless steel deep-drawing parts are mainly caused by inclusions or ferrite in the matrix. In the production process of stainless steel, the following two points should be paid attention to:

    (1) Improve the purity of the material and reduce the inclusion content in the matrix of the stainless steel material.

    (2) Improve the component design and hot rolling, cold rolling annealing process, and reduce the ferrite content of the stainless steel matrix.

    However, in the production process of stainless steel materials, these two kinds of processing defects will inevitably occur, so in the process of stamping products such as thermos cups, pressure cookers, and inner pots, appropriate technological measures can also be taken to reduce or avoid inclusions or Crack phenomenon caused by ferrite defects.

    (1) Change the forming method from thinning and deep drawing to equal thickness drawing.

    (2) Increase the number of stretching passes, increase the fillet radius of the die, and reduce the difficulty of material deformation.

    (3) Appropriately increase the viscosity of the drawing oil to promote uniform deformation of the material and avoid excessive stress concentration.

    The above is the content about the cracking of stainless steel stamping and drawing parts. It should be noted that in the forming process of stainless steel drawing parts, the die should be used first, and then the cooling of the heat generated during the drawing process should be controlled, and the drawing process should be controlled. The cooling of the heat generated during the stretching process, the upper and lower molds can be cooled if conditions permit. I hope the above can be helpful to readers.

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  • What is the reason for the wrinkling and cracking of automobile covering tensile parts?

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    The direct reason for the cracking of the workpiece is that the tensile deformation resistance is higher than the actual effective tensile strength of the material at the simple wall crack. The appropriate adjustment method to completely eliminate the breakage of the puller is as follows:

    (1) Adjust the pressing material pressure and reduce the pressure.

    (2) Adjust the stretching gap to make the gap larger and more uniform.

    (3) Adjust the radius of the mold fillet. If the radius of the mold fillet is too small, the parts are easy to crack. Increasing the die fillet radius can reduce the degree of pull cracking.

    (4) Adjust the radius of the die fillet.

    (5), adjust the relative position of punch and die.

    (6) The size of the blank is too large or the shape is incorrect, and the quality and lubrication of the plate may also cause the parts to crack. The size or shape of the blank should be changed, and the stamping process should be adjusted.

    There are many reasons why parts can crack. When adjusting, carefully check the state and position of the crack, determine the stroke position of the crack, infer the cause of the crack according to the specific situation, and then work out a specific solution to the crack.

    Some experience in solving trial wrinkling and cracking.

    During the initial deep drawing of the drawing die, the drawn parts are generally wrinkled and cracked. At this time, it is necessary to carefully observe the condition of the pressing surface and analyze the various causes of wrinkles. If there are indentations on the pressing surface and cracks at the radius of the concave die, it means that feeding is difficult; if the pressing surface is corrugated, it is easy to feed. Later, due to the generation of material corrugations, it is difficult to flow, resulting in wrinkling and cracking, that is, the material is difficult to flow during the stretching process, which will cause wrinkling and cracking during the stretching process, so different situations should be solved by different methods.

    Feeding difficulties are usually caused by excessive binder resistance. If the surface roughness of the binder surface and the die fillet is too high, or there is recoil forming and local stretching is too large, it is necessary to adjust the outer slider, reduce the blank holder force, and appropriately increase the die fillet. Reduce the surface convexity and appropriately increase the lacing clearance. If the local tensile deformation is too large and inversion occurs, it should be solved by adding process gaps or process holes.

    The feeding is easy, mainly because the feeding resistance is too small, the contact of the pressing surface is poor, or the design process performance of the drawing part is poor. If it is a binder surface problem, the binder surface needs to be ground to ensure adequate contact. In addition, the outer slider can be adjusted to increase the blank holder force or increase the blank holder area. If the process performance of the stretched part is not good, it is necessary to redesign the stretched part to make it a qualified product.

    The above only discusses how to prevent or solve the wrinkling problem of the cover from the aspects of technology, drawing die design and adjustment. There are many reasons for the wrinkling and cracking of the cover. But as long as the phenomenon is carefully studied and classified, different situations can be solved in different ways, resulting in a coating of good surface quality. Hope the above content can be helpful to readers.

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  • What are the factors that affect the quality of drawing die processing?

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    1. Materials: Good materials are half the battle. Stretching cannot be ignored. Cold rolled steel plate is mainly composed of 08Al.08.08F.10.15.20 steel, of which 08 steel is the most widely used, divided into boiling steel and killed steel. The price of boiling steel is low and the surface quality is good, but the segregation is serious and there is a tendency to adapt to aging. Not suitable for parts with high stamping performance and strict appearance requirements.

    2. Determination of blank size: The blank diameter of a simple rotating body drawing part does not become thinner during the drawing process. Although the thickness of the material has changed, it is basically very close to the original thickness. It can be calculated according to the principle of the area of ​​the blank and the area of ​​the drawn part (if there is trimming, the trimming allowance must be increased. However, the shape and process of the deep-drawn part are often complicated, sometimes thinning and stretching. Although there are many three-dimensional The software can calculate the material, but its accuracy is less than 100%.

    The solution: material testing. A product part should go through multiple processes, the first of which is usually the process of material transportation.

    First perform material calculations to have a rough idea of ​​the shape and size of the blank to determine the overall dimensions of the material delivery die. After the mold design is completed, do not deal with the convex and concave die dimensions of the material conveying die. First use wire cutting and machine the blanks (when the blanks are large, they can be milled with a milling machine and then repaired). After trial and error in the subsequent stretching process, half the size of the feed conveyor die was finally determined.

    3. The drawing coefficient m is one of the main process parameters in the calculation of the drawing process, and is often used to determine the drawing sequence and drawing times. There are many factors that affect the elongation coefficient m, including the properties of the material. The relative thickness of the material. Drawing method (with or without a blank holder). number of stretches. stretching speed. Punch and concave die fillet radius. The calculation and selection principle of the tensile factor m is the focus of introduction in various stamping manuals, including calculation. View the form. calculation and many other methods.

    The relative thickness of the material. Drawing method (with or without a blank holder). In the process of mold repair, the number of stretches is not easy to adjust, so be careful! When you choose the stretch factor m, it is better to find another colleague. Grease the concave die or place a film bag on the sheet.

    4. When stretching and cracking, apply lubricating oil on the die (do not apply it on the punch), and cover the plastic film of 0.013-0.018 mm with the die.

    5. During the stretching process, due to the cold plastic deformation, the parts are cold hardened, the plasticity is reduced, the deformation resistance and hardness are increased, the mold design is unreasonable, and intermediate annealing is required to soften the metal and restore the plasticity. Note: annealing is not necessary in the general process. After all, in order to increase the cost, choose to increase the process and increase the amount of annealing, and use it with caution! Annealing generally adopts low temperature annealing, that is, crystallization annealing.

    Two points should be noted during the annealing process: carbon and oxidation. It’s mostly about oxidation. Oxidized skin has two hazards: thinning the effective thickness of the workpiece and increasing die wear. When the company’s conditions are not met, ordinary annealing is generally used. To reduce the production of oxidized skin, the furnace should be filled as much as possible during the annealing process. I also used the soil method: 1. The workpiece can be mixed with other workpieces (premise: the annealing process parameters should be basically the same) 2. The workpiece is put into the iron box for welding, and then the electric furnace is installed. To eliminate scale, the furnace should be filled as much as possible during the annealing process.

    When the company conditions are met, nitrogen furnace annealing, that is, bright annealing, can be used. Don’t look closely, it’s almost the same color as it was before annealing. Add the intermediate annealing process when there is no other way to deal with cracks in cold-hardened metal or die tests.

    The above is about the mold processing of the drawn parts. When judging the cause of cracks in the processing of tensile parts, it can be referred to: the cracks caused by poor material quality are mostly serrated or irregular in shape, and the cracks generated by the process mold are generally neat. To ensure wear resistance and prevent tensile scratches, punches and dies and blank holders must be hardened and, if necessary, plated with hard chrome. Hope the above content can be helpful to readers.

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  • What are the common quality problems of stamping and drawing parts processed by stamping dies?

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    1. During the stretching process of the wrinkled material, the tangential stress of the surrounding edge part is too large, which causes the instability of the material and causes the product to form uneven wrinkles along the tangential direction of the edge, which is called wrinkling. When the wrinkling is serious, it will also cause the material to be difficult to pass through the gap between the die and the punch during the stretching process, the tensile deformation force will increase, and even lead to cracking. The occurrence of buckling depends not only on the tangential stress at the edge of the material, but also on the thickness of the tensile member. Generally speaking, the stretching die using nitrogen gas spring or excellent release glue has better effect, and it is not easy to appear wrinkling, cracking and other phenomena. Why? Since the force of the nitrogen gas spring or super glue is generally balanced, there is no problem of uneven force. Nitrogen gas springs are better than Uniglue, because the nitrogen springs have strong force and good balance, but the price is several times more expensive than Uniglum, and many factories cannot afford them. Generally, only slightly larger factories can afford to use gas springs. If you use it for a long time, the super glue will shrink and its strength will not be as strong as it used to be. You’ll have to get a new one, but it’s a lot less expensive than a gas spring. The blank holder ring can be used to prevent wrinkling. In some places, it is called a pressing rib, which means that a circle of raised ribs is placed around the material without affecting the post-processing of the product, commonly known as a pressing rib, to press the material. Around. The advantage of this is that the stretched product will be fuller and will also prevent wrinkling.

    The blank holder force needs to be relatively adjusted in the mold test. The general design is not so reasonable, and the height of the blank holder needs to be adjusted appropriately according to the specific conditions of the product. If the blank holder force is too large, the friction between the material and the die and the blank holder ring will increase, which will make the material wall thinner or even cracked; if the blank holder force is too small, it cannot effectively prevent wrinkling. .

    Second, the second problem is pulling crack, which is a problem often encountered in the stretching process. When the tensile stress on the cylinder wall exceeds the strength limit of the material, the product will crack, and the crack generally occurs at the cylinder wall slightly above the punch fillet.

    The factors that affect the deep drawing crack of the product are: the tensile properties of the material, the diameter and thickness of the material, the drawing coefficient, the fillet radius of the concave and convex die, the blank holder force, the friction coefficient, etc. The radius of the rounded corner of the concave and convex die is too small and too sharp, which is easy to cause the product to crack. The general mold repair method is to find a way to increase the rounded corner to make the rounded corner smoother and brighter. Yes, especially stretching oils, are very effective. When designing the stamping die, you can enlarge the fillet as far as the customer’s product allows. Don’t make it too sharp. Some designs are not well understood. The designed drawing die cracked very badly during the die test, and wanted to exhaust the fitter. what! Repairing molds is annoying.

    The use of necessary lubricants during stretching is conducive to the smooth progress of the stamping and stretching process and improves the thinning degree of the cylinder wall. But it must be noted that the lubricant can only be applied to the working surface of the die, and cannot be lubricated on the contact surface of the punch and the material, because the punch and the blank surface are a kind of favorable friction, which can prevent Material slips, cracks and thins.

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  • How to extend the service life of stamping and drawing parts?

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    1. How to prolong the service life of stamping and drawing parts?

    1. After the stamping and drawing parts are installed and used, the stamping parts must be strictly inspected, the dirt must be removed, and the guide sleeves and molds of the stamping parts must be carefully checked whether they are well lubricated.

    2. Install the mold on the turntable according to the installation steps of the mold to ensure that the direction of the mold and the mold is consistent, especially the direction (non-circular and square) required for the stamping part is larger. Take care to prevent assembly errors and backlash.

    3. When the punch of the stamping part and the edge of the die are worn, it should be stopped in time for grinding. Otherwise, the wear degree of the die edge will expand rapidly, the die wear will be accelerated, and the quality of stamping parts and die life will be reduced.

    4. Regularly check the punch turntable and die mounting seat to ensure the coaxial accuracy of both sides of the turntable.

    5. When the mold is installed, softer metals (such as copper, aluminum, etc.) should be used to make operating tools to avoid damage to the drawing parts during the installation process.

    The mold structure is reasonable, the manufacturing precision is high, the heat treatment effect is good, the punch selection of the deep drawing parts is correct, the installation accuracy is high, and the correct use, maintenance and maintenance of the mold are also important factors. Therefore, it is necessary to eliminate the adverse effects of various factors on the service life of tensile stamping parts, and take effective measures to improve its service life.

    In the production process of stretched parts, there will be many bad problems. Next, we analyze these issues.

    Second, the common bad problems in the production process of tensile parts

    1. The effect of stretching depth

    The distribution of the flow resistance of the drawn material along the die is directly related to the drawing depth. Above the position of the inner concave and outer convex curves, the drawing depth of the stretcher is too large, resulting in uneven distribution of deformation resistance and wrinkling, which should be avoided as much as possible.

    2. Adjust the blank holder force

    When the wrinkles around the part appear evenly, it should be judged that the pressing force is insufficient, and the pressing force can be gradually increased to remove it. When the tensile part stretches the conical part and the hemispheric part, most of the data is in the suspended state. The side wall is prone to wrinkling, so in addition to increasing the blank holder force, the precision stamping parts processing plant should also choose to increase the pick-up rib to increase the radial tensile stress in the sheet, thereby eliminating wrinkling.

    3. The influence of the radius of the die fillet

    If the radius of the fillet of the die of the drawing part is too large, the flow of the blank into the die through the fillet of the die is the smaller the tortuous resistance of the tortuous deformation. The smaller the tortuous resistance, the easier it is to cause wrinkling to occur. The smaller the radius of the die, the greater the bending resistance of the bending deformation, and the less likely it is to wrinkle, but it is easy to cause cracking and hair pulling of the stretched parts.

    The main reasons for the wrinkling of the stretched parts obtained through a lot of practical experience in production are the accumulation of materials during the stretching process and the excessive speed of local material movement. When formulating a solution, the precision stamping parts processing plant should consider and adjust the corresponding structure of the mold from the perspective of more than one aspect, which will get a good effect.

    The above is the relevant content about the service life and defects of stamping and drawing parts. Stamping and drawing parts are widely used in daily life. In order to properly prolong the service life of stamping and drawing parts, we also need careful maintenance. Hope the above content is helpful to readers.

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  • What are the advantages of cold stamping?

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    First, the advantages of cold stamping

    The production process of the hardware processing factory for processing metal stamping parts is the cold stamping process. Cold stamping is based on the plastic deformation of metal. Dies on a press are used to apply downward pressure to a metal sheet or strip, separating or plastically deforming the material to achieve the desired shape, size and properties. For advanced stampings, this pressure treatment method is cold stamping.

    Since the cold stamping process is a plastic deformation process, the surface of the material is not damaged, so the surface quality of the stamped parts is good, and the appearance is smooth and beautiful. This is a variety of surfaces, such as painting on the surface of stamping parts or various electroplating phosphating treatments. Provide convenience for processing, which is the main advantage of cold stamping hardware.

    After the plastic sheet is deformed, the internal structure of the metal is improved, increasing the strength of the stamped part. There are two main advantages of stamping.

    The third advantage of hardware cold stamping is that the dimensional accuracy of the stamped parts after processing is higher, which is opposite to the size of the die parts and has good interchangeability. Routine assembly and use requirements are met without further processing.

    Whether the shape structure is a pure part or a complex hardware part, or how many sets of molds are required, it is mass-produced and can replace the high cost of molds.

    Cold stamping is a processing method with high efficiency (ie high productivity) and low consumption (ie high material utilization): the cold stamping process is suitable for the production of large-scale parts, easy to realize mechanization and automation, and has high production efficiency. At the same time, cold stamping can not only achieve low-waste or no-waste production, but also make full use of leftovers without causing waste.

    Under the simple stamping of the press, various parts with complex shapes that are difficult to be processed by other processing techniques can be obtained.

    Since most stamping parts are made of sheet metal, their surface quality is good, which provides convenient conditions for subsequent surface treatment processes (such as electroplating, painting, etc.).

    Stamping can obtain high strength, high rigidity and light weight parts with low consumption.

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  • multiple draws complex shapes

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    multiple draws complex shapes From prototype through full production run, we offer a wide range of deep drawing capabilities to meet the most demanding specs: cylindrical cans up to 200mm in length multiple draws and complex shapes All tooling for single die station, progressive and transfer pressing is designed, built and maintained in-house for faster […]

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  • Metal Stamping Services Supplier

    By : Categories : Balford News,Blog Comment: Comments Off on Metal Stamping Services Supplier

    China Balford as a supplier of precision metal stamping services dates back to the company’s origins in 1998. The company, considered one of the premier precision metal stamping suppliers, specializes in the stamping of tight-tolerance, close-pitch, high-precision and light-gauge metal components. In providing precision metal stampings, we maintain a robust internal tooling capability to assure […]

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  • China Balford

    By : Categories : Balford News,Blog Comment: Comments Off on China Balford

    China Balford, a key supplier to the automotive market, offers its automotive customers the most comprehensive set of solutions for precision parts and assemblies in the industry. With each of its factories supporting the automotive industry certified to TS-16949, China Balford creates solutions for its customers while exceeding the highest quality standards required. metal stamping […]

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  • Specialists in Deep Drawn Enclosures & Shallow Drawn Metal Components

    By : Categories : Balford News,Blog Comment: Comments Off on Specialists in Deep Drawn Enclosures & Shallow Drawn Metal Components

    As specialists in deep draw technologies, China Balford Mechatronics Co.,Ltd. has been producing precision deep drawn enclosures and shallow drawn metal components for over 18 years. The company is known for its tightest tolerance deep draw, and its ability to work with complex shapes, sharp corners, exotic and difficult-to-draw materials. China Balford has broad spectrum […]

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  • Hardware Fair – Metalworking

    By : Categories : Balford News,Blog Comment: Comments Off on Hardware Fair – Metalworking

    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

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  • Start cooperation with Unimotor (Canada)

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    Congratulations! Junhao Stampings Company, one division of Balford Mechatronics Co.,Ltd.  got order for motor housing from Unimotor in 2014, which means starting the long-term cooperation with this world’s first-class automobile motor provider. Unimotor, a Four Seasons company and a division of Standard Motor Products, Inc., is located in St. Thomas, Ontario, Canada specializing in the manufacture […]

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    By : Categories : Balford News,Blog Comment: Comments Off on MESSAGE FROM PRESIDENT

    MESSAGE FROM PRESIDENT: We treasure our technical knowledge and overall capabilities ・As a press and forming machine manufacturer with full-understanding of mass production, ・ As a precision metal component manufacturer well acquainted with optimal production facilities and methods, ・ As an assembly machine & specialized machine manufacturer with wide knowledge in target work property, ・ […]

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