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本文主要讨论在加工耐热合金437时,切削刀具后面摩擦力(F_2)对已加工表面硬化及光度的影响,企图寻找已加工表面硬化的物理本质。 试验是以横向自由切削为例,用分离式刀具测出后面摩擦力。可以观察到已加工表面硬化深度主要决定于塑性变形区的深度;而硬化程度主要决定于后面摩擦力(当刀刃圆角半径ρ一定时)。因此如果从工艺要求,主要是减小硬化深度,则首先应从减小塑性变形区入手,如增大前角(γ);如果主要是减小硬化程度,则首先应从减小后面摩擦力入手,如增大后角(α)。硬化倾向严重的耐热合金437加工时,刀具后面摩擦力(F_2)较大,已加工表面硬化程度较大,当摩擦热过高时,可能导致表面软化,硬化程度减小。 关于刀具后面摩擦力(F_2)对表面光度影响不占重要地位。 由于试验过程断续另碎,作者水平浅薄,因此不免错误较多,尚待作更多的试验,进一步研究,并希批评指正。
This paper mainly discusses the influence of the friction force (F_2) behind the cutting tool on the machined surface hardening and photometry in the processing of heat-resistant alloy 437 in an attempt to find out the physical essence of the machined surface hardening. The test is a horizontal free cutting, for example, with a separate tool to measure the back friction. It can be observed that the depth of the machined surface hardening mainly depends on the depth of the plastic deformation zone; and the degree of hardening depends mainly on the back friction (when the radius of the blade fillet ρ is constant). Therefore, if from the process requirements, mainly to reduce the depth of hardening, the plastic deformation zone should be reduced from the beginning, such as increasing the rake angle (γ); if the main is to reduce the degree of hardening, you should first reduce the friction from the back to start, Such as increasing the angle (α). In the process of hardening the heat-resistant alloy 437 with severe tendency of hardening, the friction force (F_2) at the rear of the tool is larger and the degree of hardening of the surface processed is larger. When the friction heat is too high, the surface may soften and the degree of hardening decreases. The effect of friction on the back of the tool (F_2) on the surface luminosity does not play an important role. As the test process intermittent broken, the author of the shallow, it is inevitable that more mistakes, yet to be more tests, further study, and hope that criticism.