When we start to casting some crusher wear parts(such as jaw plate,blow bar,mantle),we should avoid some casting defects to keep good quality of the products.There are three common casting defects:
Shrinkage of internal defects, generally refers to the wear-resistant castings machining is still not obvious exposed shrinkage, shrinkage and other defects, mainly reticular or dendritic holes. Such defects and parts within the pipe and after processing through the surface, will lead to parts within the non-dense and leakage phenomenon.
Such defects have a slight penetration characteristics, easily lead to parts leakage, there is the possibility of infiltration
Hole type surface defects, generally refers to the wear-resistant castings exposed after processing of the pores, shrinkage, trachoma, slag hole, lack of meat and so on. In addition, wear-resistant castings after machining surface bumps, scratches, etc. also belong to such defects. This kind of defects appear isolated distribution, shape, size, location, have a greater randomness.
In this case,
Such defects generally show opposition distribution, limited depth, visibility, and matrix support, there is the possibility of repair.
There are cracks, cold, etc., the surface was narrow and small split phenomenon, there are continuous, intermittent, straight, wavy, and this kind of defects to divide the continuity of the parts.
In this case,
Such defects are often unpredictable depth, even after welding, in the course of the crack may also lead to early expansion, resulting in parts breakage or leakage, so for the penetration of linear defects are not allowed to repair.