Method for casting hydraulic oil cylinder of die-casting machine

Abstract

The invention relates to a method for casting a hydraulic cylinder of a die-casting machine, which is characterized in that the top of an oil cylinder cast part is subjected to small shrink head necking treatment to neck the thick section around an upper central hole, at least three iron chill encircling layers are arranged from the top down on the inner wall of a lower central hole, the distance from the upper end face of the uppermost iron chill encircling layer to the lower end face of the upper central hole is 5 to 10 mm, the distance between two adjacent iron chill encircling layers is 10 to 20 mm, each iron chill encircling layer comprises three to five iron chills which are uniformly distributed in the circumferential direction, the spacing of two adjacent iron chills in the same iron chill encircling layer is 10 to 20 mm, and the radial thickness of each iron chill is 0.75 to 0.85 times of the thickness of the outer wall of the lower central hole. The method can reduce the defects of loose casting and necking of the inner bore outer wall of the oil cylinder.

Description

technical field [0001] The invention relates to a casting method for a hydraulic oil cylinder of a die-casting machine. Background technique [0002] Due to the complex structure of the hydraulic cylinder of the die-casting machine and the high requirements for the use conditions of the hydraulic cylinder, the quality requirements for the cylinder are high, such as high mechanical properties, and cracks, cold shuts, shrinkage holes, looseness, and clamping are not allowed. Slag defects, so the casting process requirements for the hydraulic cylinder embryo body are relatively high. The outer wall of the inner hole of the oil cylinder is thin, so the hot joints are distributed at the thicker sections outside the outer wall. Usually, cold iron is added to the hot joints. To cool the molten iron in the cavity relatively evenly, and at the same time, it must be combined with the use of large risers to reduce the occurrence of defects such as loose shrinkage cavities at the hot jo...

AI Technical Summary

Problems solved by technology

Although the cooling rod has the effect of accelerating the cooling of molten iron, which is similar to the effect of setting the cold iron at the hot joint and improving the casting quality, the technical problem to be solved is that there is a thick section, and the casting object is thin-walled. It is difficult to implement and the effect is not good when it is at a non-hot spot

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