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What should be paid attention to when using drawing parts for stamping hardware accessories?

2022-07-09

1. The processing of stamping hardware accessories should be as simple and symmetrical as possible, and can be stretched at one time.

2. On the premise of ensuring the assembly requirements, the side wall of the deep drawing should be allowed to have a certain slope.

3. When there is a hole on the bottom or flange of the drawing piece, the distance from the hole edge to the side wall should satisfy a≥R+0.5t (or r+0.5t).

4. The fillet radius of the bottom and the wall, the flange and the wall, and the four corners of the rectangular piece should satisfy: r≥t, R≥2t, rg≥3t, otherwise, the shaping process should be added. If only one shaping is needed, the radius of the fillet can be r≥(0.1~0.3)t, R≥(0.1~0.3)t.

5. When the deformation degree of the part in one drawing is too large, in order to avoid drawing cracks, it is necessary to use multiple deep drawing. At this time, on the premise of ensuring the necessary surface quality, traces that may be generated during the drawing process should be allowed on the inner and outer surfaces.

6. The wall thickness tolerance or thinning requirements of the drawing parts should generally not exceed the wall thickness variation law of the deep drawing process. According to statistics, the maximum thickness of the simple wall in the constant thinning process is (0.2~0.3) t, and the maximum thinning amount is (0.1~0.18) t (t is the thickness of the sheet).

7. The radial dimension of the tensile part should only be marked with the external size or the internal size, and the internal and external dimensions cannot be marked at the same time. For drawn parts with steps, the dimension in the height direction should generally be based on the bottom of the drawn parts.