Problems that often occur in drawing molds

Precision—Focusing on the field of precision metal stamping and drawing for decades, and has accumulated rich experience in processing customization. We can provide one-stop service from mold design, automation development, and surface treatment, saving a lot of trouble in the middle. For drawing molds, stamping parts manufacturers will encounter many problems in the production. Next, let's take a look at them. The shortcomings of the drawing part die: the wall is cracked, the straight edge and the corner of the square tube are deformed unevenly. With the development of the stretching, the thickness only increases at the corner, and then the edging ring is milled. , The hemming strip force is concentrated on the corners, and in addition, cold work hardening is also promoted. Therefore, the force often required in bending and straightening is expanded, and the tensile load is concentrated on the corners. This kind of stretching stroke arrangement The high load value of the load curve graph appears twice. The peak value of No1 corresponds to the relativity of tensile cracking, and the high value of No2 corresponds to the relativity of wall cracking. As far as the average load is concerned, the peak value of No1 is extremely large. As far as the corner is concerned, because the tensile load is obviously concentrated at the corner in the middle and late stages of production and processing, wall cracking usually occurs at the high value of No2. Compared with alloy steel plates (soft and thick steel plates), 18-8 series stainless steel plates are more severely hardened due to cold work and are very prone to wall cracks. Even stretching a well-proportioned product like a drum will cause wall cracks. Standards of stamping die: ① Excessive hemming force; ② Poor lubrication; ③ Bad appearance of the blank; ④ Poor positioning accuracy; ⑤ Poor contact of the buffer pin. Die problems: ① The mold surface is not smooth and poor contact; ② The flatness and flatness deviation of the mold; ③ The position and appearance of the stretch ribs are not very good. Raw materials: ① Insufficient tensile compressive strength; ② If the crystal is too large, it is very easy to cause wall cracks, so the crystal of the raw material should be reduced; ③ The deformation limit is not enough, so it must be replaced with a raw material with a large r value; ④ The lifting plate is only thin and thick. Carry out trial stretches. If the vertical crack on the outer wall suffers shrinkage deformation in the early stage of production and processing, and tensile deformation in the middle and later stages of production and processing, it is likely to cause longitudinal cracks. Product appearance: ① The stretch is too large; ② The mold base semi-warp (rp) is too small; ③ The cavity size (rd) is too small; ④ The corner semi-warp (rc) of the square tube is too small. [Related recommendation] Learn more: 精の corporate culture Learn more: Continuous improvement and innovation are the key factors for the survival of stamping companies Learn more: The development of the metal stamping processing industry