Abstract:

The movement characteristic of a mould with complicated core-pulling mechanism was analyzed. The required movement of this mold can not be realized on a regular injection molding machine.The hydraulic and control systems of a regular injection molding machine was modified to meet the re-
quirement. The existing controlling components including core-pulling, core blowing, and cavity blowing, as well as internal and external hydraulic systems were fully employed，the in-core and out-core of core-pulling mechanism could be completed in one process of mould opening or closing.

Key words: injection molding machine, core-pulling, mould trial, hydraulic system, control circuits