Sharpening of Turret Punch Press Dies-DARDONTECH

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Sharpening of Turret Punch Press Dies

The specific characteristics indicating that a die requires sharpening are determined by the following three factors:

A. Inspect the fillet of the cutting edge—if the fillet radius reaches 0.25 mm, sharpening is required.

B. Check the punching quality of the workpiece to see if large burrs are generated.

C. Judge by the stamping noise of the machine—abnormal noise during die stamping indicates that the punch has become dull and needs sharpening.
Sharpening Methods and Rules:
1. The grinding allowance (depth of cut) per pass should not exceed 0.25 mm, and sufficient cooling fluid must be applied during sharpening.
2. The total allowable sharpening amount for the die is fixed (see Table 1). If this value is reached, the punch must be scrapped; otherwise, the punch press may be damaged.
3. After sharpening, the edge should be treated with an oil stone to remove excessive sharp edges. The die must then be cleaned thoroughly, demagnetized, and oiled.
Special Reminder: After sharpening, the height of the punch assembly and the lower die must be maintained at the pre-sharpening height. If not, shims should be added.