What are the cleaning procedures for large steel castings adopted by manufacturers?

The post-cleaning treatment of large steel castings by manufacturers is essential to guarantee their surface quality, dimensional accuracy and subsequent machining processes. Due to their huge volume, heavy weight and complex structure, the cleaning work is relatively complicated. The specific operations are as follows:

Carry out pretreatment and preliminary surface cleaning on large steel castings to remove residual molding sand, core sand, coating layers, surface scale and loose attachments left after casting, laying a solid foundation for subsequent fine processing.

Cut off gates, risers and other process surplus materials such as pads and tie bars used for feeding and venting during casting, to ensure the appearance of large steel castings complies with drawing requirements.

Remove flash on parting lines and core joints as well as burrs generated during casting of large steel castings, so as to prevent personnel injury and tool damage in subsequent machining and assembly.

Clean residual impurities such as sand grains, iron scraps and coating residues inside cavities, deep holes and blind holes of large steel castings, which can avoid equipment failures caused by falling debris during subsequent application.

Improve the surface roughness of large steel castings and repair local casting defects to prepare for subsequent painting, welding and mechanical processing.

Remove oil stains, rust and residual abrasives on the surface of large steel castings to ensure the accuracy of non-destructive testing.

Verify that the cleaning effect of large steel castings meets drawing and process requirements, then arrange delivery or mechanical processing.

Manufacturers shall follow the principles of from rough to fine, from outside to inside, mechanical treatment first then fine finishing in the post-cleaning of large steel castings.