Compared with mechanics performance and localization used by 65MnV steel and all old quenching ejector pins material of the plastics dies,it is ensured that 65MnV steel makes better general performance than the intrinsic material,and is effective to abstain abate and to advance its life of using.

The dependence of microstructure of newly developed plastic die ejector pins steel 65MnV on quenching temperature and tempering temperature was studiedThe results show that the quenching structure of 65MnV steel is mainly composed of dislocation martensite.

The working conditions and property requirement of steel used for ejector pins of plastic dies were investigated.

The length、diameter and using time of mandril are needed in the process of manufacturing the pipe.

To investigate factors influencing its metering quality and work function a simple working model of the eccentricity mandril metering device was developed,displacement and speed equation of the seed during working were analyzed,and the processing course of its filling and throwing were determined.

When the injection process was completed and the mold was opened,the plastic products could be ejected in two steps by the joint action of the ejector and the ejector sleeve,which could reduce the influence of ejection force to the products,and ensure a good products\' quality.