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Information Details
Grasp the essence of stamping, to create exquisite products
Release time:
2024-03-19 11:42
Source:
For the processing of five products, stamping is an essential key, and grasping the essence of stamping is the key to creating exquisite products.
1.Information from Scrap
The scrap is essentially the inverse of the formed hole. That is, the same part of the opposite position. By checking the waste, you can judge whether the gap between the upper and lower molds is correct. If the gap is too large, the scrap will have a rough, undulating fracture surface and a narrow bright band area. The greater the gap, the greater the angle between the fracture surface and the bright band area. If the gap is too small, the scrap will show a small angle fracture surface and a wide bright band area.
Excessive gaps form holes with large curls and edge tears, leaving the profile with a slight thin edge protruding. A gap that is too small forms a slight curl and a large angle tear of the tape, resulting in a profile that is more or less perpendicular to the surface of the material.
An ideal scrap should have a reasonable collapse angle and a uniform bright band. This keeps the punch force to a minimum and creates a clean round hole with very few burrs. From this point of view, by increasing the gap to extend the life of the mold is at the expense of the quality of the finished hole.
Selection of 2. Die Clearance
The die gap is related to the type and thickness of the material being stamped. Unreasonable clearance 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 punching is better, the wear of the die is more serious, which greatly reduces the service life of the die, and it is easy to cause the punch to break.
(2) the gap is too large or too small are easy to produce adhesion on the punch material, resulting in stamping with material. Too small gap is easy to form a vacuum between the bottom surface of the punch and the sheet metal and the scrap rebound occurs.
(3) A reasonable gap can extend the life of the mold, the unloading effect is good, the burr and flanging are reduced, the plate is kept clean, the aperture is consistent, the plate will not be scratched, the number of sharpening is reduced, the plate is kept straight, and the punching positioning is accurate.
3.How to improve the service life of the mold
For users, improving the service life of the mold can greatly reduce the cost of stamping. The factors affecting the service life of the mold are as follows:
Type and thickness of material;
2, whether to choose a reasonable lower mold clearance;
3, the structure of the mold;
4. Whether there is good lubrication when the material is stamped;
Whether the mold has undergone special surface treatment;
6, such as titanium plating, carbon nitride titanium;
7, the upper and lower turret of the neutral;
8. Reasonable use of adjusting shims;
9, whether the appropriate use of oblique cutting edge mold;
10. Whether the die base of the machine tool has been worn;
Special size hole stamping 4. should pay attention to the problem
(1) Please use a special punch for punching in the range of φ0.8 -- φ1.6 with the minimum aperture.
(2) When punching thick plates, please use a larger mold relative to the processing aperture. Note: At this time, if the use of the usual size of the mold, will cause the punch thread damage.
Example 1: According to the processing conditions in the following table, although the processing aperture corresponds to the-station mold, please use the B- station mold.
|
Material |
Plate thickness (mm) |
Hole diameter (mm) |
|
mild steel (40Kg/mm2) |
6.0 |
8.2-12.7 |
|
4.5 |
11.0-12.7 |
|
|
Stainless Steel (60Kg/mm2) |
4.0 |
8.2-12.7 |
|
Material |
Plate thickness (mm) |
Hole diameter (mm) |
|
mild steel (40Kg/mm2) |
6.0 |
22.9-31.7 |
|
4.5 |
30.6-31.7 |
|
|
Stainless Steel (60Kg/mm2) |
4.0 |
22.9-31.7 |
(3) The ratio of the minimum width to the length of the punch edge should generally not be less than 1:10.
Example 3, rectangular punch, when the cutting edge length is 80mm, the cutting edge width ≥ 8mm is the most appropriate.
(4) the relationship between the minimum size of the punch edge and the thickness of the plate. It is recommended that the minimum size of the punch edge be 2 times the plate thickness.