The coated sand mixing method through dry mixing method, cold laminating method, coating method, heat temperature coating method in four stages, the production of coated sand is almost covered by thermal method, coated sand process is heated to a certain temperature, then with resin, oulo aqueous solution product removal and calcium stearate mixing, after cooling and crushing and screening, resin sand and metal mould preheated to 150 degrees -350 degrees of contact, thus forming a metal mold and the contour of the cavity has been hard shell thickness, modeling method 6-12.5mm.

 

Advantages: 1) the casting size precision is high, the machining allowance is small;

 

2) the surface of the casting is smooth and the roughness is up to 12.5-6.3um;

 

3) cast thin-walled castings;

 

4) reject rate of casting;

 

5) high production efficiency;

 

Technological process：

 

Cleaning plate (core box) - template (core box) - heating spray - parting agent - shell (including baking) - top shell - type - ready to cast;