As a professional mould person, we need to have a very detailed understanding of the mold. Is the gap between the dies related to the type of material stamped?
Information from the waste situation
The scrap is essentially a reflection of the forming hole. That is, the same place in the opposite position. By checking the scrap, you can determine whether the upper and lower mold gaps are correct. If the gap is too large, the waste will appear rough, undulating fracture surface and a narrow bright zone area. The larger the gap, the greater the angle between the fracture surface and the bright zone. If the gap is too small, the waste will show a small angle fracture surface and a wide bright band area.
The large gap forms a hole with a large rivulet and edge tear, making the profile slightly with a thin edge protruding. The small gap forms a slightly curly edge and a large angle tear, resulting in the section being more or less perpendicular to the surface of the material. Motor core
An ideal scrap should have a reasonable pressure angle and a uniform light band. This keeps the impulse pressure to a minimum and forms a clean round hole with very few burrs. From this point of view, extending the die life by increasing the gap is a composite die at the expense of the quality of the finished hole.
Selection of mold clearance
The clearance of the die is related to the type and thickness of the material to be stamped. Unreasonable gaps can cause the following problems:
(1) If the gap is too large, the burr of the stamped workpiece is relatively large and the stamping quality is poor. If the gap is small, although the quality of the punch hole is good, the mold wear is serious, greatly reducing the die's service life, and it is easy to cause the punch to break.
(2) Too large or too small gaps are likely to cause adhesion on the punch material, resulting in the material being carried when stamping. Too small gaps are likely to form a vacuum between the bottom of the punch and the board and waste rebound.
(3) The reasonable gap can extend the die life, the discharging effect is good, the stamping stage advance die reduces the burrs and flanges, the plate is kept clean, the consistent aperture will not scratch the plate, reduce the number of blade grinds, and keep the plate straight., punch positioning is accurate.
III. How to improve the life of molds
For users, increasing the life of the die can greatly reduce the stamping cost. Factors that affect the life of the die are as follows: Electric stamping die
1, the type and thickness of the material; Nail punch
2, whether to choose a reasonable lower mold gap rotor flush
3, the structure of the mold form;
4, whether the material has good lubrication;
5, whether the mold has undergone special surface treatment;
6, such as titanium plating, carbon titanium nitride;
7, the alignment of the upper and lower turning towers;
8, adjust the rational use of gaskets;
9, whether the appropriate use of sloping edge mold;
10, whether the machine tool mold has been worn;
Problems that should be paid attention to when stamping special size holes
(1) Use a special punch for punching in the minimum pore diameter φ 0.8-φ 1.6 range.
(2) For thick plate perforation, please use a larger mold than the machining aperture. Note: At this point, if you use a normal size mold, it will cause damage to the punch thread.
Stamping die is also a type of mold, for the mold gap between what factors and stamping die should pay attention to the issues, as described above!