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过去我厂生产的金屬用鑲片圓锯(如图1)是以整体高速鋼(P9)制成的。它的硬度要求是:工作部分Rc62～64,非工作部分Rc35～40。由于这类工件既薄且短,在热处理过程中,其非工作部分不能滿足于要求,硬度常常高达Rc50以上,給机械加工带来了很大困难。若将非工作部分的沟槽先行銑出,然后再进行热处理,則变形非常严重,以致不能使用。經苏联专家建議:采用对接焊的办法,把非工作部分改
In the past I produced the metal with an insert circular saw (Figure 1) is based on the overall high-speed steel (P9) made. Its hardness requirements are: working part Rc62 ~ 64, non-working part Rc35 ~ 40. Because these types of workpieces are both thin and short, their non-working parts can not be satisfactorily satisfied during the heat treatment. The hardness is often as high as Rc50, which brings great difficulties to machining. If the non-working part of the groove milling first, and then heat treatment, the deformation is very serious, so can not be used. The Soviet Union experts suggest: the use of butt welding methods, the non-working part of the change