目前国内生产犁铧的中、小型工厂,加工犁铧铧刃时,大多采用在刨床或专用设备上用仿形方法加工制造刃部的工艺.近几年来,随着热挤压工艺的发展,在犁壁、刮土铲等农机产品中已经广泛地采用了热挤压工艺.犁铧刃部也采用热挤压的方法加工,工艺简单、生产效率高、便于流水作业生产. 犁铧刃部热挤压工艺的实质,是加热的犁铧坯料受到楔形上模的挤压作用,当挤压力超过金属屈服点时,金属就开始滑动,因下模是一块坚硬的平板,这时犁铧就被楔形上模挤出需要的铧刃(图1).采用该工艺,能在一次加热中完成切前刃部和挤刃口工序,此外,利用余热还可以充分进行冲孔和切去刃口余块这两工序.采用这种方法制造犁铧,因为坯料是在高温下挤刃,还具有只需要小吨位机床和模具结构简单 At present, the domestic production of ploughshare in small and medium-sized factories, processing ploughshare Hua edge, most of the use of planing machine or special equipment used to shape processing edge manufacturing process.In recent years, with the development of hot extrusion process, the plow Wall, scraper shovel and other agricultural machinery products have been widely used in the hot extrusion process. Plowshare blade is also the use of hot extrusion process, simple process, high production efficiency, easy flow production. The essence is that the heated plowshare is pressed by the wedge die and when the pressing force exceeds the yield point of the metal, the metal starts to slide, because the die is a hard plate, and the plowshare is squeezed by the wedge die Out of need Hua blade (Figure 1). Using this process can be completed in a heating front cutting edge and squeeze cutting edge process, in addition, the use of residual heat can also be fully punching and cutting edge of the remaining pieces of these two steps Using this method to make ploughshare, because the blank is squeezing edge at high temperature, but also has only a small tonnage machine and mold structure is simple