According to the structure of the product, the unique asymmetric tilt mandril of the core side-pulling mechanism and the cool- ing system made up of channel and deep cavity are designed, which increases the ability of cooling and ensures that the product can be successfully taken out from the injection mould.

According to the structure of the product,the unique tilt mandril and side-slug of the core side-pulling mechanism were designed,which ensured that the product could be taken out from the injection mould.

In order to achieve the four-direction pulling core,the special tilt mandril was designed according to the product structure,which simplized the injection mould structure.

Analyzed the processing characteristics of product,determined the gate location by simulating the molding process of clutch through MoldFlow,designed the lifter structure and two-parting plane mold structure,descripted the mold\'s work process.

Introduced a inner ejection pin in angle ejector structure that prevent product pulling pulling injury and displacement.

By process analysis of the complex angle ejector,proposed a way for manufacturec omplex angle ejector via adjusting the machine order for mold parts,put forward a manufacturep rocess for angle ejector,solved the manufacture problem concerning a unsymmetrical anglee jector with different slope in each side,and as a result,realized efficient manufacture of anglee jector.

According to the main characters of overlap underground chambers, the top pillar between two adjacent underground chambers is simplified to the beam fixed at both ends, and dynamic loading is simplified to harmonic wave.

It was concluded that the 9th scheme can make the top pillar stable,and an optional mining program and some measures were.