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我厂一九六九年接受天津市试制8.75mm电影机部分工装任务中,有两副斜齿轮塑胶模具。为了完成模具型腔的加工,电极必须作螺旋运动,因而一般电火花机床无法解决。模具的特点是品种多而数量少,搞专用设备不现实。如采用电铸法制造齿圈(即模具),则因电铸周期长、质量差(如铜基质软,镍基质脆)使得模具寿命低而成本昂贵;若采用塑料做齿圈,成本虽低,但寿命不高,且使用单位限于技术条件,自行翻制型腔模有一定困难。我厂工人与技
I plant in 1969 to accept trial production in Tianjin 8.75mm film machine part of the task of the installation, there are two helical gear plastic mold. In order to complete the mold cavity processing, the electrode must be a spiral movement, and therefore general EDM machine can not be solved. The characteristics of the mold is more and less variety, engage in special equipment unrealistic. Such as the use of electroforming manufacturing gear ring (ie, mold), the electroforming cycle is long, poor quality (such as copper matrix soft, nickel matrix brittle) makes the mold life is low and expensive; plastic ring gear, the cost is low , But the life is not high, and the use of units limited to technical conditions, self-cavity mold cavity has some difficulties. I plant workers and skills