电机刷盒的材质是ZL104,它有两个滑块抽芯和两个螺栓嵌件。半圆孔φ20~(+0.13)垂直于分型面,被平分在动、静模上(见图1)。由于铸件的材质为铝合金,必须要有拔模斜度。但此孔系转轴配合孔,不允许有拔模斜度。对该孔要么加工、要么在压铸型上采取特殊结构消除拔模斜度。为使此孔不经加工而由压铸直接获得,我们设计了一种无拔模斜度的压铸型结构。其中半圆孔φ20~(+0.13)由一活动型芯形成。 Motor brush box is made of ZL104, it has two slider core and two bolt inserts. Semi-circular hole φ20 ~ (+0.13) perpendicular to the parting surface, is divided in the dynamic and static mold (see Figure 1). As the casting material is aluminum alloy, you must have draft taper. However, the hole with the shaft hole system, does not allow draft taper. The hole is either machined or a special structure is used on the die-cast to eliminate the draft. For the hole to be obtained directly from die-casting without machining, we designed a die-cast structure without draft. The semi-circular hole φ20 ~ (+0.13) formed by a movable core.