外文翻譯---刀具前角對(duì)切削加工振動(dòng)的影響-其他專業(yè)-wenkub.com
2025-01-15 09:22 本頁(yè)面
【正文】 ），即采用合適的剛度和濕度等。也就是通過(guò)采用設(shè)置助減振系統(tǒng)來(lái)增加系數(shù) C或者暫時(shí)減少數(shù)量，這樣就可以在高速切削情況下得到高的精度和高的質(zhì)量。 ，最大振動(dòng)幅度時(shí)相應(yīng)的切削速度范圍為 V=50— 70m/min； 當(dāng) γ 0≥ 0176。 2）當(dāng) γ 00176。如上所述， Py隨前角的增大而減小，因此 Kγ 0。在切削進(jìn)程中，刀具振動(dòng)在主振動(dòng)方向形成振動(dòng)速度 y.，相對(duì)速度 201v v y?? 不僅數(shù)值變化，方向也變化。這是因?yàn)榈毒咔敖堑脑龃髸?huì)使前表面對(duì)切屑及切屑塑性變形減小從而使刀具表面摩擦系數(shù)降低，因此，它可以減小切削強(qiáng)度，從而使切削加工振動(dòng)降低。 時(shí)，最大振幅發(fā)生在 V=160— 180m/min。實(shí)驗(yàn)裝置示意圖如圖 1 圖 1 實(shí)驗(yàn)裝置示意圖 說(shuō)明：真空傳感器測(cè)試點(diǎn)距離卡盤表面為 200mm（表面粗糙度為 Ra= ），傳感器固定于車床尾部，切削部分與卡盤外部底端的距離為 50— 190mm。 ，刀具圓角半徑為 — ，切削速度 V為 20— 30m/min，進(jìn)給量為 ，嚙合量間隙為 。 ，刀具主偏角 kr為 45176。,0176。在大多數(shù)時(shí)候，精密和半精密機(jī) 器對(duì)配件表面有嚴(yán)格要求。這個(gè)調(diào)查為實(shí)際中采用合理的刀具前角提供了理論依據(jù)。刀具前角是一種最特別的集合參數(shù)，它直接影響切削帶形變，切屑形狀，切屑強(qiáng)度，刀具頭強(qiáng)度和加工表面質(zhì)量，這些情況已經(jīng)經(jīng)過(guò)一些國(guó)外學(xué)者的調(diào)查研究。而當(dāng)γ 0≥ 0176。, it is at V=160~180m/min。 3) At same cutting speed, with rake angle changing, amplitude of machining vibration also changes。, the corresponding cutting speed range of largest vibrating amplitude is V=50~70m/min。, it is at V=160180m/min. To each tool, three repeat experiments are done to verify the reliability of above testing data, its trend of vibration is roughly the same, only the amplitude of vibration changes a little all (relative error less 5%). 3 Analysis of Experiment Result On the base of measured data and experiment curve in , analysis is given as fellows: Relation between Rake Angle and Biggest Amplitude In pliance wity table 1, putting data in order, relation between rake angle and biggest amplitude of vibration see table 2. It indicates: With tool rake angle increasing, the biggest amplitude value progrssively decreases. It is because rake angle increasing lessens press of rake face to chip, plastic defrmation of chip reduced, then coefficient of chip frictiona force on tool rake face decreases, therefore, it lessens cutting force, results in amplitude of viberation in machining operation dropping. Effect of Rake Angle and Clearanec Angle Dynamic Changing on Amplitude of Vibration From machining principle, tool work angle changes with tool movement properties, and it affects cutting force. Variation of work angle is decided by the situation of cutting edge plane in machining operation[2,3].Variation of tool rake angle and clearance angle in machining operation is list in . In cutting process, tool vibrates at the direction of main vibration, formes vibrating y , relative velocity 201v v y?? changes not only at value, but also at direction. Namely, because of y changes with time, it changes the situation of tool cutting edge p
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