滾珠螺帽精密磨削之刀具幾何設計與加工參數最佳化研究

Ball Nuts Cutting Tool Geometry Design of Precision Grinding and Optimization of Machining Parameters

陳任垣(Run-Yuan Chen)

指導教授 ： 黃社振

國立虎尾科技大學/工程學院/機械設計工程研究所/碩士(2013年)

摘要

滾珠螺桿傳動具有低磨擦和高效率的特性，廣泛應用於工具機及工業應用之高速精密進給系統。其加工精密度直接影響傳動時的振動、噪音和定位精度。因此磨削滾珠螺桿與螺帽之砂輪幾何設計、刀把設計及磨削加工參數更是影響其加工精密度之關鍵要素。為順應精密加工需求，本研究利用共軛嚙合理論，建立砂輪幾何參數化數學模型，產生精密砂輪幾何形狀以磨削各種規格之螺桿與螺帽，並為磨削長型大導程內螺旋溝槽時防止干涉而創新斜式刀具之機構設計。接著利用有限元素分析直式及斜式刀把裝置之動態磨削加工應力、應變、接觸壓力、砂輪偏擺量和自然頻率。最後現場實際磨削加工驗證並確認砂輪幾何外形正確性。

關鍵字

滾珠螺帽 ； 大導程 ； 幾何設計 ； 數學模型 ； 干涉

並列摘要

Ball screw drive with low friction and high efficiency characteristics is widely used in machine tools and high-speed precision feeding system of industrial applications. Its machining precision directly affects the vibration, noise and positioning accuracy of transmission. Therefore, key factors for grinding wheel geometry design of ball nuts, tool holder mechanism design and grinding parameters are affecting the machining precision. To meet the demand for precision machining, the geometric parameters mathematical model of grinding wheel profiles is established based on the theory of conjugate meshing surfaces to produce precision grinding wheel geometry to grind a variety of screw and ball-nut. An innovative mechanism design of inclined tool for grinding high-lead of the ball nut to prevent interference in the internal spiral grooves is developed. The finite element analysis of the inclined straight tool grind including dynamic stress, strain, contact pressure, grinding wheel deflection and natural frequency is presented. Finally, the actual grinding machining verification and confirm the grinding wheel geometry correctness is also been investigated.

並列關鍵字

Ball nut ； High- lead ； Geometric design ； Wheel profile ； Interference

參考文獻

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