What are the knowledge and skills of mold maintenance?

Mold maintenance knowledge and skills are as follows:

Mold maintenance refers to the repair work of the mold when the mold fails to meet the predetermined use requirements or the parts fail to meet the quality requirements. The work was done by the mold repairman. The following introduces the maintenance methods and requirements of several common faults of molds.

A, the blade collapse:

The edge collapse caused by various reasons in the use of the mold will have a certain impact on the quality of the parts. It is one of the most common repair contents in mold repair.

First, the repair steps of broken edge of knife edge are as follows:

1. According to the situation of edge collapse, if the edge collapse is very small, it is usually necessary to polish the edge collapse with a grinder to ensure firm welding and avoid edge collapse again;

2. Weld with corresponding covered electrode. At present, we use D332 covered electrode to weld the cutting edge. Before surfacing, the repair datum must be selected, including clearance surface and non-clearance surface;

3. Smooth the gapless surface of the cutting edge (refer to the datum left in advance);

4. Draw a line on the transition piece. If there is no transition piece, the clearance surface can be roughly ground with the reference left in advance;

5. Go to the machine to repair the clearance surface, and use clay and other auxiliary research to match. Be careful in the repair process, start the press as slowly as possible, and adjust the height of the mold to open downward when necessary to avoid the phenomenon of knife edge biting;

6. The blade clearance should be reasonable. For steel plate stamping die, the clearance of single edge knife edge should be 1/20 of the thickness of sheet metal. However, in the actual operation process, as long as the burr of the cut part meets the requirements, the size of the gap can be tested by sheet metal stamping. Generally speaking, the judgment standard of burr size is that the height of burr is not greater than110 of sheet thickness;

7. Check whether the clearance surface of the knife edge is consistent with the shearing direction;

8. After the clearance is matched, smooth the clearance surface of the knife edge with an oilstone to reduce the friction between the plate and the knife edge in production and the resistance of waste falling.

B, burr:

When trimming, punching and blanking parts, it is easy to have too many burrs. The main reasons for burrs are that the gap between the cutting edges of the die is large and the gap between the cutting edges is small:

When the gap is large: the bright band of the section is very small or basically invisible, and the burr is characterized by being thick and large, which is not easy to remove;

Small gap: there are two bright bands on the section. Because of the small gap, the burr is characterized by high and thin.