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四、平头凸模的成形高度如上面已指出的,局部成形压窝高度有限,必须考虑模具几何参数。但完全照原有几何参数,又过于复杂,难于求解。下面提供一个方法,既予以必要的简化,又大大避免了由于简化所带来的误差。用平头凸模成形时,在接触角θ未达到90°以前,其情形如图7所示,有ab和cd两个弧段和bc直切线段。设r_o、r_p和r_d都是模具半径已加一半材料厚度的数值,间隙可忽略不计。
Fourth, the forming height of the flat punch As pointed out above, the limited height of the local forming pits, mold geometry parameters must be considered. But completely according to the original geometric parameters, but also too complicated and difficult to solve. The following provides a way to both simplify as necessary, and greatly avoid the error caused by the simplification. With the flat-headed punch molding, the contact angle θ does not reach 90 ° before, the situation shown in Figure 7, ab and cd two arcs and bc straight tangent segment. Let r_o, r_p and r_d be the thickness of the die half the thickness of the material, the gap is negligible.