General solution to problems in precision casting process

Casting die processing process is often a number of more throughout the problem, because each kind of problems are caused by different reasons, so in the practice of processing needs to deal with these problems, according to the practice of the problem to deal with. Mould expert luo baihui followed up the situation of the member enterprises of the association and introduced several general solutions:

1. Clean the parting surface, cavity and top lever; Modify coating materials and improve spraying skills; Strengthen clamping ability, strengthen the pouring metal component. These are the kinds of things that can be done with simple control.

2. Parameters of dispatching processing skills, injection capacity, injection speed, time of filling the mold, time of opening the mold, temperature of pouring, temperature of the mold, etc.

3. Replace principle, select alloy ingots with excellent quality, improve the share of new principle and recycle principle, and improve smelting treatment skills.

4. Repair and change the casting mold, repair and change the casting system, strengthen the internal pouring port, add and set up overflow tank and gas discharge tank, etc

Flow mark defect solution

Cast mark

Other titles: stripes.

Features: the surface of the casting is consistent with the moving direction of the liquid metal, and part of the sunken smooth lines can be felt by hand. This defect has no development direction, which can be achieved by polishing.

Cause of flow mark in casting:

1. The two metal streams are out of sync and covered with marks left by the cavity.

2, mold temperature is low, such as zinc alloy die temperature below 150 ℃, alloy die temperature below 180 ℃, are prone to make this kind of defect.

3. Too high filling speed.

4. Excessive amount of coating.

Method of casting flow trace cleaning:

1. Adjust the cross-sectional area or orientation of the inner gate.

2. Adjust the mold temperature to increase the overflow tank.

3. Properly adjust the filling speed to change the flow state of the liquid metal filling cavity.

4. Apply thin and even coating.