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目前S195柴油机连杆的螺孔,普启遍采用标准切削丝锥(简称丝锥)攻丝,所加工出的螺孔对分开面的垂直度(简称攻丝垂直度)不稳定比较突出,本文对这个问题提几点看法供参考。一、丝锥攻丝时的受力状况丝锥攻丝时,就象螺栓拧进螺母内一样,不同的是,丝锥在外力的驱动下,将工件孔内不需要的金属切削掉,留下螺旋状的空间,这样丝锥必然要承受金属的抗力(切削力)。丝锥切削时所受的力属空间力系,现以四槽丝锥为例分析,为方便起见,标出开始切削时四齿上的力(单齿切削刃切削时承受的径向合力)f_1、f_2、f_3及f_4如图1所示。设丝锥攻丝时从a处开始切削,力f_1推
Currently S195 diesel engine connecting rod screw holes, commonly used throughout the standard tap cutting (referred to as tap) tapping, the processing of the screw hole on the separation of the vertical (referred to as tapping perpendicularity) instability is more prominent, this article on this Some questions raised for reference. First, tapping tapping stress tapping tapping, as the same screw into the nut, the difference is that the tap in the external force driven, the workpiece hole will not need to cut off the metal, leaving the spiral Space, so tap must bear the metal resistance (cutting force). Taps are subject to the force of force space, the four taps are now an example of analysis, for convenience, marked the start of cutting four teeth on the force (single tooth cutting edge to bear the radial force) f_1, f_2, f_3 and f_4 shown in Figure 1. Set tapping tapping start cutting from a, force f_1 push