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线材行业、电光源行业广泛使用的一种模具是拉丝模。拉丝模的质量直接影响线材、灯丝的形状、尺寸、表面粗糙度及使用寿命。我国现行采用的拉丝模模孔研磨工艺是五十年代初从苏联引进的针磨工艺,它的工作原理是:模具旋转,针状磨头在模孔内作微小移动或摆动,以达到加工模孔的目的。这种工艺的主要缺点是:加工质量得不到保证且生产效率很低。针状磨头设计成锥状是为了使其在模孔内穿进方便,同时在磨削中产生径向分力以提高磨削效果,但这样一来就带来很多弊端。首先,针状磨头的锥度使加工出来的模孔也具有锥度。使用有锥度的模孔拉丝时,因为仅是锥状模孔的小端与工件丝接触,接触面积小,应力陡增、模孔磨损
Wire industry, widely used in electric light industry is a die drawing die. Drawing die quality directly affects the wire, filament shape, size, surface roughness and service life. China’s current use of wire drawing die hole grinding process is introduced in the early 1950s from the Soviet Union needle grinding process, and its working principle is: rotation of the mold, needle-shaped grinding head in the mold hole for small movements or swinging to achieve processing mold The purpose of the hole. The main disadvantage of this process is that the quality of the processing can not be guaranteed and the production efficiency is low. Needle-shaped grinding head designed to be tapered in order to make it easy to wear in the die hole, while grinding produce radial component to improve the grinding effect, but this has brought a lot of drawbacks. First of all, the taper of the needle-shaped grinding head makes the machined die hole taper too. Use tapered hole when drawing, because only the small hole taper hole and workpiece wire contact, the contact area is small, the stress increased sharply, die hole wear