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直柄麻花钻四辊轧制工艺的应用虽然已相当广泛,但由于工艺及材料热塑性方面的诸多问题,在日益激烈的国际竞争中正在失去优势。关中工具厂为了充分发挥四辊轧工艺的优势,尽量减少因轧裂造成的废品损失和提高钻头的质量,大量采用轧沟磨背工艺,即在热塑变形中,不直接轧出钻头刃背带,而只轧出钻头的沟形,刃带则通过磨背工序获得。与磨制钻头相比,可节约高速钢25～30％,具有生产效率高,钻头外观好,钻头强度高等优点。特别适用于热塑性较差的材料。1985年以来,该厂每年生产轧沟磨背钻头300万件,每年节约人民币110万元。
Although the application of the straight shank twist drill four-roll rolling process has been quite extensive, due to the problems of thermoplasticity of the process and materials, it is losing its advantage in the increasingly fierce international competition. Guanzhong Tool Factory In order to give full play to the advantages of four-roll rolling process to minimize scrap damage caused by the rolling and improve the quality of the drill, a large number of groove ditch back grinding process, that is, in the thermoplastic deformation, not directly out of the drill edge strap , But only out of the drill bit groove, land through the back grinding process. Compared with grinding the bit, the high speed steel can save 25 ~ 30%, with the advantages of high production efficiency, good bit appearance and high bit strength. Particularly suitable for poor thermoplastic materials. Since 1985, the mill annually produces 3 million roller-grooved back bits, saving RMB1.1 million annually.