What Are The Ways To Improve Mold Life And Mold Grinding?

Apr 19 , 2023 | Blog

How to improve the service life of the mold


For users, improving the service life of the mold can greatly reduce the stamping cost. The factors that affect the service life of the mold are as follows:


1. Material type and thickness;

2. Whether to choose a reasonable mold clearance;

3. The structural form of the mold;

4. Whether the material is well lubricated during stamping;

5. Whether the mold has undergone special surface finish;

6. Such as titanium plating, titanium carbonitride;

7. Align the upper and lower turrets;

8. Reasonable use of adjusting gaskets;

9. Whether the beveled blade mold is used correctly;

10. Whether the mold base of the machine tool is worn;


Die grinding


1. The importance of mold grinding

Regular grinding of dies ensures consistent stamping quality. Regular grinding of the mold can not only improve the service life of the mold, but also improve the service life of the machine tool. It is necessary to grasp the correct timing of sharpening the knife.


2. The specific characteristics of the mold need to be honed


For the sharpening of the mold, there is no strict number of hammering to determine whether sharpening is required. It mostly depends on how sharp the blade is. It is mainly determined by the following three factors:

(1) Check the rounded corners of the cutting edge. If the fillet radius reaches R0.1mm (the maximum R value cannot exceed 0.25mm), sharpening is required.

(2) Check stamping quality. Are there big glitches?

(3) Judging whether sharpening is required based on the noise of machine punching. If the same pair of dies makes abnormal noises when punching holes, it means that the punches are blunt and need to be sharpened.


NOTE: The edge of the blade is rounded or the back of the blade is rough. Sharpening should also be considered.


3. Sharpening method


There are many ways to sharpen the die, this can be done with a special sharpener or on a surface grinder. The sharpening frequency of the punch and the lower die is generally 4:1. Please adjust the mold height after sharpening.

(1) Harm of incorrect sharpening method: Improper sharpening will aggravate the rapid damage of the mold blade, resulting in a greatly reduced number of hammering for each sharpening.

(2) The benefits of the correct sharpening method: Regular sharpening of the mold can keep the punching quality and precision stable. The cutting edge of the mold is damaged slowly and has a long service life.


4. Sharpening rules


The following factors should be considered when grinding molds:

(1) In the case of R0.1-0.25 mm, the sharpness of the cutting edge fillet depends on the sharpness of the cutting edge.

(2) The surface of the grinding wheel should be cleaned.

(3) It is recommended to use a soft coarse-grained grinding wheel. Such as WA46KV

(4) The amount of each grinding (knife) should not exceed 0.013 mm. Excessive grinding will cause the surface of the mold to overheat, which is equivalent to annealing, and the mold will become soft, which will greatly reduce the life of the mold.

(5) Sufficient coolant must be added when grinding.

(6) When grinding, the punch and lower die should be firmly fixed, and special fixtures should be used.

(7) The grinding amount of the mold is constant. If this value is reached, the punch will be scrapped. If you continue to use it, it is easy to damage the mold and machine.

(8) After grinding, the edge should be treated with a whetstone to remove excessively sharp edges.

(9) After sharpening, clean, demagnetize and oil.


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