Dongguan Jie Aosi Die Casting Factory found that in the process of processing aluminum alloy castings, due to raw materials or operations, various quality problems will occur in die castings. Aluminum alloy die-casting manufacturers provide you with solutions on the official website. Today, we mainly explain the problem of wrong shape and pockmarked surface.
The misalignment mainly includes four situations: misalignment, misalignment, misalignment and misalignment. Its main manifestation is that the die-casting part is misaligned on the parting surface, and relative displacement occurs, that is, the thread is misaligned. Aluminum alloy die-casting manufacturers have explored the reasons and summarized them into three points: the mold used in processing has displacement of inserts; the guide parts of the mold are worn; the inserts of the two halves have manufacturing errors; in order to avoid wrong types, the manufacturer It is necessary to adjust or trim the inserts in time, tighten and eliminate errors, and replace the guide post and guide sleeve in time.
The peeling of aluminum alloy die castings, also known as peeling, delamination, peeling, etc., is another manifestation of cold insulation. Most of them are obvious multi-layer metal skins on the outer surface or inside of zinc alloy die castings, and the occurrence parts are mostly concentrated in Large flat surfaces, arcuate surfaces, or near sharp corners. Obvious peeling is the metal skin layer that is obviously separated from the matrix in part of the casting, or there is a non-dense pockmarked metal layer on the surface of the casting; the insignificant peeling is formed by the accumulation of multiple thin layers. Careful observation of the casting blank shows 2- 7mm high-bright flaky surface, but no peeling defects can be seen, and obvious peeling defects appear after shot blasting or high temperature
Pockmarking is also a quality problem in the production of aluminum alloy castings. It is also called pitting. During the filling process, because the mold temperature or the temperature of the alloy liquid is too low, the surface of the casting is caused by similar underpressure conditions. The formation of small pockmarked distribution areas. The reason for the pockmarked surface may be that the thickness of the inner gate is too small, or that the metal is dispersed into dense droplets when the aluminum alloy die-casting factory fills, and hits the mold wall at high speed. The corresponding solution is to properly adjust the thickness of the inner gate, or to design the gating system correctly before production, try to avoid molten metal splashing, improve the exhaust conditions, prevent the molten metal from being involved in too much gas, and also reduce the speed of the inner gate. , increase the mold temperature.