论文部分内容阅读
钻头热轧工艺,具有生产效率高,能大量地节约原材料等特点,故已广泛地为各厂所采用,但目前,四辊轧机的应用,仍只限于规格较小的钻头。四辊轧机扩大规格范围,用于锥柄钻头生产,是一项比较复杂的课题。关键在于必须提高产品精度,如果不能掌握热轧工艺参数,设计高精度机床,则一切措施,终将失败。因为较大规格的锥柄钻头,精度与沟形要求均较高,难于达到,其二是材料消耗额大,废品率每提高或减少百分之几,均意味着成吨高速钢的浪费或节约。另一个关键的方面,是轧机的刚性问题,
Drill hot-rolling process, with high production efficiency, can save a lot of raw materials and other characteristics, it has been widely used by various plants, but at present, the application of four-roll mill, still limited to the smaller specifications drill. Four-roll mill to expand the scope of specifications for taper shank drill production is a more complex issue. The key is to improve product accuracy, if you can not grasp the hot-rolled process parameters, the design of high-precision machine tools, all measures will eventually fail. Because of the larger specifications taper shank bit, accuracy and ditch requirements are high, difficult to achieve, and the other is the material consumption of large, scrap rate increased or decreased by a few percent each mean tons of high-speed steel waste or saving. Another key aspect is the rigidity of the mill,