Common problems and solutions in the production of metal stamping and stretching parts

Metal stamping and stretching parts can be seen everywhere in our daily life. Metal stamping and stretching parts will produce various problems for various reasons in mass production. This paper summarizes experience and shares common problems and solutions in the production of metal stamping and stretching parts:

common problems of metal stamping and stretching parts:

1 The main reason for the inconsistency between the shape and size of metal stamping and stretching parts is that they will bounce and inaccurate positioning. In addition to taking measures to reduce springback, we should also improve the accuracy of blank positioning

2. Surface strain of metal stamping and stretching parts

surface strain of metal stamping and stretching parts is caused by improper material selection, low heat treatment hardness, poor finish, concave die fillet wear, poor surface quality of bending blank, out of tolerance of material thickness, unreasonable selection of process scheme, lack of lubrication and other reasons

3. Bending crack of metal stamping tensile parts

(1) when the included angle between the bending curve and the rolling grain direction of the sheet is not in conformity with the regulations, the bending curve shall be perpendicular to the rolling grain direction in case of unidirectional V-shaped bending; When bending in both directions, the bending curve is 45 degrees from the direction of rolling grain

(2) the material plasticity of tensile parts is poor

(3) the bending radius is too small and the pickling quality is poor

(4) insufficient lubrication - high friction

(5) the fillet radius of punch and die is worn or the gap is too small - the feeding resistance increases

(6) poor quality of blank shear and blanking section of tensile parts - burrs and cracks

(7) the material thickness is seriously out of tolerance - it is difficult to feed

solution:

1 The processing shape of metal stamping and stretch forming shall be as simple and symmetrical as possible, and shall be deep formed at one time as far as possible

2. For parts that need to be stretched for many times, on the premise of confirming the required appearance quality, it shall be allowed that there are traces that can occur in the stretching process on the inner and outer surfaces

3. On the premise of confirming the installation requirements, the side wall of the tensile part shall be inclined to abide by the contract

4. The spacing from the hole edge on the bottom or flange of the tensile part to the side wall shall be appropriate

5. The fillet radius of the bottom and wall, flange and wall of the stretched part and the four corners of the rectangular part shall be appropriate

6. The dimensions of metal stamping and stretching parts shall not be marked together with the internal and external dimensions