The most common repair problem of hardware mold should be burrs, some burrs are better to repair, and the gap can be fixed with a good knife edge, but some burrs are not just a gap problem. The following analysis of the several reasons for the burr, hoping to enlighten the mold colleagues:

1. the edge is blunt: the edge is worn dull or gnawed. Factors that affect the sharpening of the cutting edge are:

1, mold convex, concave die material and surface treatment state is poor, poor wear resistance;

2, the structure of the die is poor, poor rigidity, resulting in gnawing;

3, the operation is not timely lubrication, wear fast;

2. clearance: the blanking clearance is too large, too small or uneven can produce burrs. The following factors affect the gap is too large, too small or uneven:

1, mold manufacturing error, die parts processing does not meet the drawing, the bottom plate parallelism is not good;

2, mold assembly error, large gap in the guide part, mold assembly of different hearts, etc.

3, the accuracy of the punching machine is poor, such as the clearance of the punching machine guide rail is too large, the parallelism between the bottom surface of the slider and the surface of the table is not good, or the vertical degree of the slider stroke and the punching machine table is not good, the rigidity of the table is poor, and the deflection is generated during punching, which can cause the change of the clearance;

3. the blanking state is improper

If the material is not in good contact with the punch or die, when the trimming and punching of the improper positioning relative height, it will also produce burrs because the workpiece height is lower than the positioning relative height, and the shape of the workpiece and the shape of the cutting edge will not fit in the punching process.

The above content is about the causes of metal mold burr, I believe you have some understanding. Metal stamping burrs are usually produced in sheet metal punching, generally speaking, it is difficult to avoid, by improving the process of the parts, improve the stamping conditions, can avoid or reduce burrs.