1. Wrinkling and stacking
Wrinkling is one of the most important and difficult problems that troubles stamping production. The wrinkling defect will cause many adverse consequences, and in severe cases, it can also form stacking. Wrinkling can have a serious impact on the appearance and surface of the part, especially after coating. Severe wrinkling can make the part unable to be repaired, leading to its invalidation.
Reason: During the stamping process of sheet metal, the material activity is unbalanced, resulting in compression that cannot be absorbed and eliminated.
Processing idea: Balance the speed of sheet metal movement.
Handling method:
(1) Increase the stretching rib by welding to increase the resistance of the sheet material movement;
(2) Apply strong pressure treatment to the wrinkled part to reduce the gap on the surface;
(3) Change the shape of the stretching reinforcement, such as changing the circular reinforcement to square reinforcement, or changing the size of the stretching reinforcement;
(4) Add the size of the material to increase the effect of the edge pressing ring.
Temporary production measures:
Increase the edge pressing force of the press;
(2) Place adhesive tape at relevant locations;
(3) Adjust the balance block, reduce some of the balance block gaskets, and add some of the sheet material movement resistance.
2. Cracking and damage (necking)
Cracking usually occurs during the debugging of new molds or sheet materials, which directly leads to the invalidation of the parts. Strain is the ultimate manifestation of the parts about to crack. After coating and baking, the material stress is released, which may still cause the parts to crack. Therefore, it is necessary to eliminate the strain of the finished parts during the stamping production process.
Reason: Due to the smooth movement of the sheet metal, the degree of tensile deformation of the sheet metal during the stamping process exceeded the elongation requirement of the material itself, resulting in cracking of the stamped parts.
Processing idea: Improve the speed of sheet metal movement.
Handling method:
(1) Burn and weld down the stretching ribs to reduce the resistance of the sheet material feeding;
(2) Improve the surface smoothness of the mold;
⑶. Add a piercing knife and add a portion of the supply of sheet material activities;
(4) Change the shape of the stretching reinforcement;
(5) Reduce the edge size of the sheet metal.
Temporary measures for production:
(1) Apply lubricating oil to the cracked or damaged area;
(2) Properly reduce the edge holding force;
(3) Adjust the balance block and add some balance block gaskets to reduce the resistance of some sheet material movements.
Wrinkling is one of the most important and difficult problems that troubles stamping production. The wrinkling defect will cause many adverse consequences, and in severe cases, it can also form stacking. Wrinkling can have a serious impact on the appearance and surface of the part, especially after coating. Severe wrinkling can make the part unable to be repaired, leading to its invalidation.
Reason: During the stamping process of sheet metal, the material activity is unbalanced, resulting in compression that cannot be absorbed and eliminated.
Processing idea: Balance the speed of sheet metal movement.
Handling method:
(1) Increase the stretching rib by welding to increase the resistance of the sheet material movement;
(2) Apply strong pressure treatment to the wrinkled part to reduce the gap on the surface;
(3) Change the shape of the stretching reinforcement, such as changing the circular reinforcement to square reinforcement, or changing the size of the stretching reinforcement;
(4) Add the size of the material to increase the effect of the edge pressing ring.
Temporary production measures:
Increase the edge pressing force of the press;
(2) Place adhesive tape at relevant locations;
(3) Adjust the balance block, reduce some of the balance block gaskets, and add some of the sheet material movement resistance.
2. Cracking and damage (necking)
Cracking usually occurs during the debugging of new molds or sheet materials, which directly leads to the invalidation of the parts. Strain is the ultimate manifestation of the parts about to crack. After coating and baking, the material stress is released, which may still cause the parts to crack. Therefore, it is necessary to eliminate the strain of the finished parts during the stamping production process.
Reason: Due to the smooth movement of the sheet metal, the degree of tensile deformation of the sheet metal during the stamping process exceeded the elongation requirement of the material itself, resulting in cracking of the stamped parts.
Processing idea: Improve the speed of sheet metal movement.
Handling method:
(1) Burn and weld down the stretching ribs to reduce the resistance of the sheet material feeding;
(2) Improve the surface smoothness of the mold;
⑶. Add a piercing knife and add a portion of the supply of sheet material activities;
(4) Change the shape of the stretching reinforcement;
(5) Reduce the edge size of the sheet metal.
Temporary measures for production:
(1) Apply lubricating oil to the cracked or damaged area;
(2) Properly reduce the edge holding force;
(3) Adjust the balance block and add some balance block gaskets to reduce the resistance of some sheet material movements.
