Solution of shrinkage cavity and shrinkage porosity of die-casting aluminum alloy

Release time:

2024-02-29

Characteristics and inspection methods:

① Anatomy or flaw detection inspection, the hole shape is irregular, not smooth, the surface is dark; ② large and concentrated for small shrinkage and scattered for shrinkage.

Cause:

① During the solidification process of the casting, holes are caused due to shrinkage and no metal compensation is obtained; ② The pouring temperature is too high, and the mold temperature gradient distribution is unreasonable; ③ The injection ratio is low, and the pressurization pressure is too low; ④ The inner gate is thin, the area is too small, and premature solidification is not conducive to pressure transmission and molten metal replenishment; ⑤ There are hot joints on the casting structure or the section changes violently; ⑥ The pouring amount of molten metal is too small, the remaining material is too thin to feed.

Processing method:

① Reduce the pouring temperature and shrinkage; ② Increase the injection specific pressure and pressurization pressure to improve the compactness; ③ Modify the in-gate to make the pressure transfer better, which is conducive to the liquid metal feeding effect; ④ Change the casting structure to eliminate the metal accumulation part and make the wall thickness as uniform as possible; ⑤ Accelerate the cooling of thick parts; ⑥ Thicken the material handle by 15~30mm to increase the feeding effect.

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"Die Casting Weekly"-On June 2, 2022, Zhejiang Tianya Jiangtao Power Co., Ltd. ("Tianya Jiangtao") and Lijin Group Ningbo Lijin Technology Co., Ltd. ("Ningbo Lijin Technology") jointly held a signing ceremony for batch purchase of large die casting units and strategic cooperation. It is reported that Tianya Jiangtao will introduce 10 sets of 1250-6000T large intelligent die casting units from Ningbo Lijin Technology. Tianya Jiangtao Chairman Hu Ronghui, Vice President Zhao Hongfu, Factory Director Peng Wenjiang, Ningbo Lijin Technology General Manager Zhang Jun, Sales Director Zhou Kang and other leaders attended the signing ceremony.

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