Method for reducing casting defect of automobile brake caliper body

Abstract

The invention relates to a method for reducing casting defect of an automobile brake caliper body. A cavity of a brake caliper body is positioned in a core box movable mould B (4), and the brake caliper body has a thermal center (8). In order to ensure the thermal center (8) is solidified firstly, the method is characterized in that a cold iron (2) is arranged between a core box movable mould A (1) and a fixed mould (3) before filling iron liquid is cast; the filling iron liquid around a cylinder bore (7) is solidified firstly under the chilling action of the cold iron after the iron liquid enters into the cavity; liquid contraction and solidification contraction appearing in the solidification process obtain sufficient supplement from a riser by a feeding channel, and finally, shrinkage holes are moved in the riser to reduce the casting defect of the brake caliper body of the automobile. The invention not only eliminates the shrinkage porosity and the shrinkage holes defect for casting, but also improves the rate of final products.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method for reducing casting defects of an automobile brake caliper body. Background technique [0002] The brake caliper body is one of the main components of the automobile braking system. It forms a pair of friction pairs with the piston ring, and moves relative to each other under pressure to achieve the purpose of braking. Therefore, the airtightness of the cylinder hole of the brake caliper body very important. The current process plan uses coated sand cores, and the overheated riser is fed; the problems existing in the coated sand core process are: unstable product quality, small process adaptability, slight fluctuations in composition, and a sharp increase in reject rate , wherein shrinkage porosity and shrinkage cavity account for 85% of the total number of waste products; through observation, it is found that the shrinkage porosity parts of the waste produ...

AI Technical Summary

Problems solved by technology

The current process plan uses coated sand cores, and the overheated riser is fed; the problems existing in the coated sand core process are: unstable product quality, small process adaptability, slight fluctuations in composition, and a sharp increase in reject rate , wherein shrinkage porosity and shrinkage cavity account for 85% of the total number of waste products; through observation, it is found that the shrinkage porosity parts of the waste products are all concentrated in the joint part, and the shape of the holes is irregular and the crystal material is coarse

[0004] 2) The riser cannot be directly placed at the hot joint of the casting structure, but can only be placed at the closest position. The feeding channel has solidified before the hot joint is completely solidified, so that the current riser cannot be effectively fed. This leaves a shrinkage cavity at the hot spot

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