Stamping parts manufacturers, to teach you how to solve the problem of punch when material distortion

Stamping parts manufacturers, to teach you how to solve the problem of punch when material distortion

1. Punch as material, the cause of the distortion

In progressive die, die-cutting stamping surrounding by the method of excess stock, to form the appearance of salt pieces.Salt pieces turn makings, distortions of the main reason for the influence of cutting force.Blanking, as a result of the existence of blanking clearance, material in the side of the die by stretching up warping (material), on the convex side by compression.When using stripper plate, using the stripper plate clamp material, to prevent the side of the die material up warping, at this point, the stress of the material of the corresponding change.With the increase of the unloading slabs the blank material force, rely on the convex side of the material by the tensile, compression force decreases, and die surface material by compression (tensile force decreases).Stamping parts as the flip of material on the surface of the concave die caused by stretching.So when cutting, pressure and pressure material is prevent salt pieces turn makings, the key point of distortion.

2. To suppress stamping materials, twist method

(1). Add crush function.To discharge set piece of material of pressure increasing size (normal unloading with pieces of thick H + 0.03 mm), in order to increase pressure on the concave side material, thus inhibiting the punching stamping double material and torsion deformation.

(2) pressure material.Overcome the traditional mould design structure, open capacity on the stripper plate material clearance (namely die closed, stripper plate and die, and accommodate CaiLiaoChu stripper plate and die clearance for material thickness t - 0.03 ~ 0.05 mm).So, stamping in the stripper plate smooth movement, and material can be pressure.Key forming parts, stripper plate must be making set piece of structure, with convenient solution stripper plate pressure caused long time stamping parts produced by grinding (pressure) loss, not pressure material.

(3). Daily mold production, should pay attention to maintenance of convex and concave die cutting edge sharpness.When cutting blade wear, material by the tensile stress will increase, and stamping parts produced material, distortion tends to increase.

(4). Punch edge end fix the bevel or arc.This is an effective way to slow down the blanking force.Slow down the blanking force, can reduce the tensile force of the concave side material, thus suppressing stamping double material and torsion effect.

(5). The blanking clearance is not reasonable or uneven clearance is also produce stamping parts material, the reason of the distortion, need to be overcome.

(6). Reasonable mould design.In the progressive die, blanking order arrangement is likely to affect the precision of the stamping forming.For stamping fine blanking parts, general arrangement of large-area first cutting blanking, then arrange the punching blanking of smaller area, in order to reduce the cutting force of the influence of the stamping forming.

3. The common concrete problems in the production processing

In daily production, will encounter punching small or large size (likely beyond specification) and the punch size is large, in addition to consider the design of the forming of convex and concave die size, machining accuracy and blanking clearance and other factors, also should consider the following several aspects to solve.

(1). To the crush of material, make the material produces plastic deformation, can lead to punching size is big.And reduce pressure, punching size will be small.

(2). Punch edge end shape.Such as end slope or arc, due to slow down the blanking force, salt pieces not easily get turn, twist, therefore, the punching size is big.And punch end plane (no slope or arc), punching size is relatively small.

(3). Cutting blade wear, material by the tensile stress increases, stamping parts produced material, distortion tends to increase.Produce double way, punching size will be small.

Cold stamping generally no longer by machining, or only need a small amount of machining.Hot stamping precision and surface state is lower than the cold stamping parts, but it's still better than the castings, forgings, cutting processing capacity.

Mainly introduces the blanking, stamping turn makings, twisted causes and countermeasures.In concrete production practice, we should make a concrete analysis for concrete problems, so as to find out the method to solve the problem.