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进风道是三同步节煤炉上的一个零件,见图1,它与一般带凸缘拉深盒形件有所不同,在两边各有一个深8mm的凸耳,凸耳是二次风的进口,截面积虽不大,但要求密封,凸绦平面平整,另外有一端是敞开的。其拉深工艺性很差。对于这种半敞的工件一
Into the air duct is a synchronous furnace section of a coal-saving stove, shown in Figure 1, which is generally different from the flange with a box with a depth of 8mm on each side of the lugs, lugs are secondary air The import, although the cross-sectional area is not large, but requires sealing, flat convex bashing, the other is open at one end. Its deep drawing process is poor. For this semi-open workpiece one