Engine cylinder block cavity die machining technology

Abstract

The invention discloses an engine cylinder block cavity die machining technology. The engine cylinder block cavity die machining technology comprises the steps that material laying and rough machiningare carried out, then hardening and tempering and finish machining are carried out, and a fixed die and a movable die are obtained respectively, wherein a forming cavity is formed in the middle of the inner side face of the fixed die; material laying is carried out, a die core blank is obtained through rough machining, and the die core blank is subjected to further heat treatment and finish machining, and a die core is obtained, wherein the heat treatment includes the steps that the die core blank is continuously heated to 980-1030 DEG C, then cooled to 420-450 DEG C through oil cooling or gas cooling and then subjected to air cooling, the die core blank obtained after air cooling is tempered, and the hardness of the die core blank is made to be 45-48 HRC; the die core is assembled and fixed to the forming cavity of the fixed die; and the fixed die and the movable die are combined, and the attaching degree is inspected. According to the engine cylinder block cavity die machining technology, the fine texture of the die core is transformed into martensite, carbide, bainite and residual austenite which are separated out of the crystal boundary are reduced or avoided, the hardness ofthe die core is uniform, and the forming and die removing effects of the die core are improved; and the fixed die and the movable die are combined, and the attaching degree is inspected, so that the die combining effect can be improved, and the casting quality can be improved.

Description

technical field [0001] The invention relates to the technical field of cavity mold production, in particular to an engine cylinder cavity mold processing technology. Background technique [0002] The cylinder block of the automobile engine is the skeleton of the engine, and the main parts are installed in it. Due to the complex structure of the cylinder block of the automobile engine, the molding is difficult, and it cannot be manufactured by the assembly method. Therefore, the cavity mold casting is usually used for casting. [0003] The existing engine block cavity molds have the problems of poor mold clamping accuracy, poor mold core forming and demolding effects, which lead to a high defective rate of the cast engine block and cannot meet the standard requirements. The reason is that the fixed mold And the processing accuracy of the movable mold is poor, and many problems in the processing process make the hardness of each part of the mold core different, which makes th...

AI Technical Summary

Problems solved by technology

[0003] The existing engine block cavity molds have the problems of poor mold clamping accuracy, poor mold core forming and demolding effects, which lead to a high defective rate of the cast engine block and cannot meet the standard requirements. The reason is that the fixed mold The machining accuracy of the moving mold is poor, and many problems in the machining process make the hardness of each part of the mold core different, which makes the overall performance of the mold core poor, directly affecting its molding and demoulding effect