The process of stainless steel casting and precision casting

The process of stainless steel casting and precision casting

During the use of zirconium sand and zirconium powder in precision casting, some problems often arise. Phenomena such as insufficient coating thickness, peeling, cracks, etc.

1、 Coating accumulation [Reason:] Stainless steel precision casting precision casting

1. The flow of paint is slow, as paint is a thixotropic fluid with a network structure and yield value. Yield value and viscosity are the two main factors causing paint accumulation. The yield value of the coating is too high and the viscosity is too high, resulting in a decrease in the fluidity of the coating;

2. The flow marks generated by the coating during the flow process flow along the sand mold, causing accumulation when encountering grooves, resulting in unclear edges of the sand mold;

3. The inclination angle of the sand mold is not appropriate;

4. Low flow rate, paint cannot flow down, causing accumulation;

5. Due to insufficient pressure, the flow rate is slow, resulting in accumulation.

2、 [Measures taken:] Stainless steel casting with silica sol precision casting

From the perspective of on-site operation, it is necessary to reduce the Baume degree of the coating.

1.Practice has shown that the flowability of the coating is best when the Baume degree of the flow coating is between 22-26. Considering the factors of the coating itself, it is necessary to reduce the yield value and viscosity of the coating;

2. Use an air duct or brush dipped in a diluent to remove flow marks;

3. Requirements for the placement angle of sand molds: Use a crane to lift the sand molds above the paint tank at an angle of 75-90 degrees to the horizontal for flow coating;

4. Increase the cross-sectional area of the flow coating rod head and hose to increase the flow rate. Generally, the flow coating rod head and hose used are 4-branch pipes. If the cross-sectional area is increased, both can use 4-branch pipes and 6-branch pipes respectively, or both can use 6-branch pipes at the same time;

Precision machining