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Stamping Parts Suppression Of Twisting Methods

The stamping part is a forming method for obtaining a workpiece (stamping part) of the desired shape and size by applying an external force to the plate, the strip, the pipe and the profile by the press and the mold to cause plastic deformation or separation. Stamping and forging are the same plastic processing (or pressure processing), collectively forging. Stamping blanks are mainly hot and cold rolled steel and steel.

Stamping parts and castings, forging compared to a thin, uniform, light, strong features. Stamping can be made by other methods difficult to manufacture with stiffeners, ribs, undulating or flanging of the workpiece to improve its rigidity. As a result of precision molds, the workpiece accuracy of up to micron level, and repeat high precision, consistent specifications, you can punch out the hole nest, bumps and so on.

Cold stamping parts are generally no longer machined, or require only a small amount of cutting. Hot stamping parts accuracy and surface state is lower than the cold stamping parts, but still better than castings, forgings, cutting less.

Stamping is an efficient production method, the use of composite mold, especially the multi-station progressive die, can be completed in a press punching process, to achieve by the material open-book, leveling, punching to the forming, finishing the whole Automatic production. High production efficiency, good working conditions, low production costs, the general production of hundreds of pieces per minute.

Stamping is mainly classified according to process, can be divided into two major categories of separation process and forming process. The separation process, also known as punching, is intended to separate the stamping part from the sheet along a certain contour line while ensuring the quality requirements of the separation section. The surface and intrinsic properties of the stamping sheet have great influence on the quality of the finished product. The thickness of the stamping material is accurate and uniform. The surface is smooth, no spots, no scars, no abrasions, no surface cracks, etc .; the yield strength is uniform and no obvious Directional; uniform elongation; yield ratio is low; low work hardening.

Stamping parts are mainly metal or non-metallic sheet, with the pressure of the press, stamping die stamping processing, which mainly has the following characteristics:

(1) stamping parts are in the material consumption is not under the premise of the stamping produced, the parts of light weight, good stiffness, and sheet metal after plastic deformation, the internal structure of the metal is improved, so that the strength of stamping parts increased The

⑵ stamping parts with high dimensional accuracy, uniform size with the same module, a better interchangeability. No further machining is required to meet general assembly and use requirements.

⑶ stamping parts in the stamping process, because the surface of the material is not damaged, it has a good surface quality, the appearance of smooth and beautiful, which for the surface painting, plating, phosphating and other surface treatment provides a convenient condition.

The method of suppressing the punching and twisting of the stamping parts

⑴. Reasonable mold design. In the progressive die, the arrangement of the cutting sequence may affect the accuracy of the forming of the stamping parts. For the small parts of the stamping parts of the cutting, the general arrangement of a larger area of the punching cut, and then arrange a smaller area of the cutting cut to reduce the punching force on the impact of forming stamping parts.

⑵. Press the material. To overcome the traditional mold design structure, in the discharge plate out of the material gap (that is, when the mold is closed, and the material can be compressed. Key forming parts, the discharge plate must be made inlaid structure to facilitate the solution Time stamping caused by the discharge plate pressure parts of the mill (pressure) loss, and can not compress the material.

⑶. Additional pressure function. (Normal discharge inserts thickness H + 0.03mm), to increase the pressure on the die side of the material, thus inhibiting the punching when the stamping parts produce turning, twisting deformation.

⑷. Punched edge of the edge of the mouth to repair the slope or arc. This is an effective way to reduce the punching force. Reducing the blanking force, can reduce the tensile material on the concave side of the material, so as to achieve the suppression of stamping parts to produce material, twist effect.

⑸. Daily mold production, should pay attention to maintain the punching convex, concave edge sharpness. When the punching edge wear, the tensile stress of the material will increase, so that the stamping parts produce turning, twisted tend to increase.

⑹. Blanking gap is irrational or uneven gap is also the production of stamping parts, twisting reasons, to be overcome.