论文部分内容阅读
在切削金属时,震动的产生是破坏机床-工件-刀具系统刚度的原因之一,它使被加工工件表面质量变坏(出现波纹度),从而破坏了工件的加工精度。我们所做的实验指出,震动的参量(振幅与频率)与被加工金属的机械性质间有一定的关系。实验在以下的条件下进行:S=0.30公厘/转,t=1公厘,n=300转/分,γ=10°,φ=45°α=6°,刀具为硬质合金T15K6。应用下列的鋼:40、30、20X、CT.6、CT.3①;二极鑄铁№3②;青鋼p.6-6-3、4～3;及铝作为被加工的金属。各种不同金属的硬度对震动强度的影响如[图一]所示,从图中可以看出,当增加硬件度时,震动的强度(振幅)几乎是直线下降;并且,具有相同硬度的各种金属,震动的振幅是相同的。
When cutting metal, the vibration is one of the reasons that undermine the rigidity of the machine tool - workpiece - tool system, which deteriorates the surface quality of the workpiece (waviness), thus undermining the machining accuracy of the workpiece. Our experiments show that there is a certain relationship between the vibrational parameters (amplitude and frequency) and the mechanical properties of the metal being processed. The experiment was carried out under the following conditions: S = 0.30 mm / rev, t = 1 mm, n = 300 rpm, γ = 10 °, φ = 45 ° α = 6 ° and the tool was cemented carbide T15K6. The following steel is used: 40, 30, 20X, CT.6, CT.3①; Diode cast iron №3 ②; Qinggang p.6-6-3, 4-3; and aluminum as machined metal. The influence of the hardness of various metals on the vibration strength is shown in Fig. 1. It can be seen from the figure that when the degree of hardware is increased, the vibration strength (amplitude) almost linearly decreases; and the hardness The kind of metal, vibration amplitude is the same.