What is the root cause of the casting defects in aluminum alloys?
This is a lot of ah, aluminum liquid itself, wood type problems, coating problems, these are possible.
Mold, process, material, operation skills, operating environment will cause casting defects. In general, few people will consider the operating environment. If the climate is humid, it will also increase the intake of aluminum.
The reasons for the formation of defects, defects can be divided into liquid aluminum is mainly caused by liquid aluminum slag and gas removal filter and filling defect; the main misrun and cold lap, and slag, sand core gas; solidification shrinkage is the main defects.In actual production, it is easy to confuse the hole in the product, the slag hole, the blowhole and the shrinkage hole are different, and only the accurate judgment can be reasonably solved.The slag hole shall be solved from the angles of the aluminum liquid, the filter screen, the inner gate, the filling speed and the slagging point of the feeder;The blowhole should be solved from the aluminum liquid, the sand core exhaust, the mold exhaust and the riser exhaust;The shrinkage shall be resolved from the point of view of the solidification sequence.
Alpha aluminum dendrite growth speed, solidification range, easy to form shrinkage defects and chemical properties of Al pine, lively, easy and environmental material response caused by defects. Aluminum alloy casting conditions are relatively simple, easy to start, and if the inspection method is not very strict, it is still a good road to prosperity
