What are the causes of defects in Shandong Aluminum alloy die casting?
1、 Streaks and streaks
Appearance inspection: the surface of the casting has the same stripe with the moving direction of the molten metal, and there are obvious visible non directional lines which are different from the metal matrix color, so there is no development trend.
1. the causes of the flow mark are as follows: (1) the mold temperature is too low; (2) the design of the runner is not good, and the gate location is bad; (3) the material temperature is too low; (4) the filling speed is low, and the filling time is short; (5) the pouring system is unreasonable; (6) the exhaust is bad; (7) the spray is unreasonable.
2. The cause of the pattern is too much coating in the cavity or poor quality of the coating
(1) Adjust the cross-section area or position of the runner; (2) increase the mold temperature; (3) adjust the speed and pressure of the runner; (4) select the appropriate coating and adjust the dosage.
2、 Reticulate hairy wing (turtle crack)
Appearance inspection: the surface of the die casting has the trace of net hair like protrusion or depression, which expands and extends with the increase of die casting times.
The causes are as follows: (1) there are cracks on the surface of die casting die cavity; (2) uneven preheating of die casting die.
2. The methods to solve and prevent the defects of Shandong Aluminum alloy die casting are as follows
(1) The die casting die should be annealed regularly or after a certain number of times to eliminate the stress in the die cavity; (2) if there are turtle cracks on the surface of the die cavity, the forming surface should be polished to remove the crack layer; (3) the preheating of the die should be uniform.
The above is about Shandong Aluminum alloy die casting defect reason content, I believe you have understood, if you want to know more mold processing technology, welcome to click our website to learn more.