Timely sharpening of the mold can effectively extend the service life of the mold

If the workpiece has excessive burrs or abnormal noise during punching, the mold may be passivated. Check the punch and the lower die. When the edge wear produces an arc with a radius of about 0.10 mm, it will be sharpened. Practice has shown that frequent small amount of sharpening instead of waiting until it is necessary to sharpen, will not only maintain good workpiece quality, reduce the punching force, but also more than double the life of the mold. In addition to knowing when the mold is sharpened, it is especially important to master the correct sharpening method. The mold sharpening rules are as follows:

1. When sharpening, clamp the punch vertically in the V-shaped groove or clamp of the magnetic chuck of the surface grinder, and the grinding amount is 0.03~0.05mm each time, and the grinding is repeated until the punch Sharp, the maximum grinding amount is generally 0.1~0.3mm. (Guide: Briefly describe the main features of PCD grinding processing)

2. Use sintered alumina grinding wheel with hardness D~J and abrasive grain size 46~60. It is best to choose a grinding wheel suitable for high-speed steel grinding.

3. When the grinding force is large or the mold is close to the grinding wheel, adding coolant can prevent the mold from overheating and cracking or annealing. High-quality multi-purpose coolant should be selected according to the manufacturer's requirements.

4. The downward feed of the grinding wheel is 0.03~0.08mm, the lateral feed is 0.13~0.25mm, and the lateral feed rate is 2.5~3.8m/min.

5. After sharpening, polish the cutting edge with oilstone to remove the burrs, and grind out a rounded corner with a radius of 0.03~0.05mm, which can prevent the cutting edge from chipping.

6. The punch is demagnetized and sprayed with lubricating oil to prevent rust.

More related stamping hardware mold industry news: