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工具的振动是在高强度、耐热合金及钛合金上钻孔时强化切削用量的主要障碍,用丝锥在上述材料上攻丝时困难尤为明显。查明工艺系统最薄弱环节即工具自激振动的原因及其降低方法,可以控制自激振动的强度,以便提高工具的寿命、机械加工生产率和制品质量。对攻制螺纹时的动力学分析表明,丝锥自激振动的强度主要取决于两个原因:攻螺纹的力矩相对于速度的下降特性和由于丝锥横断面的翘曲切削力滞后于切面厚度的变化。切削力滞后于切面厚度的变化对自激振动的振幅影响
The vibration of the tool is a major obstacle to strengthening the cutting amount when drilling holes in high strength, heat-resistant alloy and titanium alloy. It is especially difficult to tap the tap on the above materials. Identify the weakest link in the process system, the cause of the self-excited vibration of the tool, and how to reduce it so that the strength of the self-excited vibration can be controlled to improve tool life, machining productivity, and product quality. The dynamic analysis of the tapping thread shows that the strength of the self-excited vibration of the tap mainly depends on two reasons: the tapping torque moment relative to the speed drop characteristic and the change of the warp cutting force due to the cross-section of the tap lag behind the thickness of the section . The influence of cutting force lagging behind the change of section thickness on the amplitude of self-excited vibration