我厂产品零件矩形喇叭(图1)由H62黄铜板制成。零件的几何形状要求高,大口内边对角线允差0.10毫米。弯角内圓角半径≤0.1毫米,大小口不同心度允差0.1毫米,内表面光洁度为▽7。按老工艺,该零件由两块弯成90°的铜板银焊、抛 Our factory product parts rectangular speaker (Figure 1) made of H62 brass plate. Parts of the geometric shape of the requirements of large mouth inside the diagonal tolerance of 0.10 mm. Angle fillet radius ≤ 0.1 mm, the size of the mouth of different concentricity tolerance 0.1 mm, the inner surface finish ▽ 7. According to the old craft, the part is made of two pieces of silver welded and tossed by 90 ° copper plates