The non-machined surface and appearance quality of machine tool castings have a considerable impact on the commercial properties of the castings.

 

⑴ Surface unevenness (box expansion, shrinkage and sand inclusion);

⑵ The cleanliness of the surface or inner cavity (sticky sand, sticky "paint layer");

⑶ Flatness deviation (unprocessed surface undulations);

⑷ Surface roughness;

⑸ Contour definition (contour definition of structural units such as bosses, umbilicals, etc., evaluated by naked eyes).

machine tool castings

 

The requirements of machine tool castings for lost foam:

 

⑴ Paint requirements: use water-based graphite paint with a Baume degree between 60 and 70. When painting, it is in the greenhouse. It is strictly forbidden to move it before drying to prevent deformation.

⑵ Brushing requirements: the paint is stirred evenly, and the white is rigorously exposed when brushing.

(3) Coating drying: After the coating is dried, it should have sufficient strength, and it should be dried at 50-60℃ for 24h.

 

Heat treatment process of machine tool castings:

 

As a large-scale casting, machine tool casting products must undergo heat treatment to improve their performance and improve the inherent quality of cast iron plates. Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing processes, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but by changing the internal microstructure of the workpiece, or changing the chemical composition of the surface of the workpiece , To give or improve the performance of the workpiece. Its characteristic is to improve the internal quality of the workpiece.