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在压铸件的生产中,铸件滞留在静模内无法取出是常有的事。其原因是铸件在动模中的留模力小于在静模中的留模力。一般的解决方法是增大静模内的起模斜度,减小动模内的起模斜度。但在实际生产中,受铸件结构和尺寸的限制,这两种方法收效不大。 我厂在生产“感载比例阀”的阀盖时,往往干5～6件就滞留静模一次,严重影响了生产进度。我们采取了改造顶杆形状的方法,把顶杆的前部做上沟槽,让顶杆拉住毛坯,利用顶杆和模具之间的摩擦力作为留模力。如果这个留模力还不够大,还可以在推板的前部加装弹簧,利用其反弹力作留模力,以达到拉住毛坯的目的。
In the production of die-casting parts, castings remain in the static mold can not be removed is common. The reason is that the casting mold retaining force in the movable mold is smaller than the mold retaining force in the static mold. The general solution is to increase the mold within the static mode tilt, reduce the dynamic mode tilt within the mold. However, in actual production, due to the structure and size of the casting, these two methods have little effect. I plant in the production of “proportional valve load” of the valve cover, often dry 5 to 6 dead static mold once, seriously affected the progress of production. We have taken the method of reforming the shape of the mandrel, making the front part of the mandrel into a groove, allowing the mandril to pull the blank and utilizing the friction between the mandrel and the mold as the mold retaining force. If this mold force is not big enough, you can also install a spring in the front of the push plate, using its rebound force as a mold force, in order to achieve the purpose of drawing rough.