Design of Injection Mould for Inner Ring Groove Pipe Joint
Intelligent Engineering College, Jiangxi University of Technology, Nanchang 330000, China
Abstract：Aiming at the injection molding of inner ring groove pipe joint plastic part, a kind of two plate cold and hot runner simplified injection mould without ejection mechanism was designed. In order to realize the molding and demoulding of the inner wall of the plastic part, two special demoulding mechanisms were designed, one of which was the two-time and four-directions core pulling mechanism, and the other was the two-time demoulding mechanism of slider floating ejection. The demoulding principle of the two-times and four-directions core pulling mechanism is: first, the hydro-cylinder drives the slider to do the first core pulling action to complete the four-directions core pulling demoulding of the ring groove of the inner wall of the pipe, then, the slider continues to core pulling to achieve the second side core pulling action of the other inner walls. The principle of the two times demoulding mechanism of slider floating ejection is: first, the whole sliding block mechanism is ejected by lifting hydro-cylinder to realize the first demoulding of the outer wall of the plastic part on the core, then, the inner core of the pipe is pulled out from the inner wall of the plastic part by side core pulling hydro-cylinder to realize the second demoulding of the remaining outer walls, so as to achieve the purpose of automatic demoulding of the whole plastic part. The selected parting and layout settings can effectively simplify the structures of mould and demoulding mechanism and reduce the difficulty of mould design.
Keywords：injection mould; mechanism design; ring groove demoulding; secondary core pulling; elbow
Tian Ke. Design of injection mould for inner ring groove pipe joint[J]. Engineering Plastics Application，2020，48(9)：98-102.