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研究生(外文):Ko-Yu Lin
論文名稱(外文):Process Automation on Single Machine for Machining Dynamic Lag Screw
外文關鍵詞:metal cuttingpolygon turningSwiss machinedynamic hip screw systemsynchronous machining
  • 被引用被引用:3
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本論文的目的在於開發植入式醫療器材-動態拉力骨釘(Dynamic Lag Screw)的單機自動化生產製程。動態拉力骨釘為動態髖部骨釘系統(Dynamic Hip Screw System)中的重要零件。本研究將簡化及整合深孔、內螺牙、多邊形柄部以及不對稱螺牙等不連續的複雜加工程序,成為一個單機自動化生產製程。此製程可降低加工時間,減少機台與夾治具的購買,並提高工件精密度,以應付產品量少多規格的需求。
The purpose of this research is to develop an automation process on a single machine for machining a medical implant-Dynamic Lag Screw. Dynamic Lag Screw is an important component of Dynamic Hip Screw System.
In this research, the discontinuous complicated procedures, machining operations for deep hole, internal thread, polygon shank, and asymmetric thread…etc., are simplified and integrated as an automatic machining procedure on a single machine. Such process decreases machining time, reduces expenses of machines and fixtures, and improve resulting precision. With such a process, the requirements for production of small orders with a variety of specifications can be met.
In this research, a new machining method for machining the polygonal shank, two-side synchronous turning, is developed. Two power driven tools are installed on two sides of the workpiece. The tool for machining cylindrical faces is on one side and that for machining planar faces is on the opposite side. This procedure can produce the planar faces as well as the cylindrical faces simultaneously, such that the making of the polygonal shank can be completed in a single operation.
In two-side synchronous turning, the tool for machining cylindrical faces, a disk equipped with a number of cutting teeth, rotates with a speed ratio of non-integer number with respect to the workpiece for circular cutting. The cutting can produce a polygon with huge number of edges to form a near circular curve. The result is almost the same as it was machined by turning. The locus of the tool tip for the above method can be simulated and analyzed. The number of edges and the error between the near circle and the required circle can be calculated by setting parameter values for rotation ratio and tool tooth number. With considerations of machine performances and material properties, the optimized parameter settings can be obtained.
In implementation, difficult-to-machine materials for medical implants such as titanium alloys Ti-6Al-4V and stainless steel 316L are used in the experiments. With the machining method developed in this thesis, the experiments have been carried out on the Swiss type automatic machine
摘要 I
目錄 IV
圖目錄 VII
第一章 介紹 1
1.1 研究背景 1
1.2 研究目的 4
1.3 研究方法 4
1.4 內容大綱 6
第二章 特殊加工方法 7
2.1 深孔加工 7
2.2 內螺牙加工 10
2.3 多邊形柄部加工 10
2.3.1 雙邊同步車削製程 13
2.3.2 多邊形柄部平面加工 14
2.3.3 多邊形柄部圓柱加工 19
2.4 不對稱螺牙加工 23
2.5 小結 27
第三章 逼近圓車削之運動學分析 28
3.1 刀尖運動軌跡 29
3.2 非整數轉速比對刀尖軌跡的影響 34
3.2.1 改變非整轉速比中S之整數部份對軌跡的影響 37
3.2.2 改變非整數轉速比中S之小數部份對軌跡的影響 40
3.3 逼近圓之誤差分析 43
3.3.1 單刀尖之徑向誤差 44
3.3.2 多刀尖之徑向誤差 (總徑向誤差) 47
3.3.3 軸向誤差 49
3.4 小結 53
第四章 製程規劃與實作 54
4.1 加工流程規劃 54
4.1.1 內部加工流程規劃 55
4.1.2 外部加工流程規劃 57
4.2 重要加工參數設定 61
4.2.1 多邊形車削之參數設定 61
4.2.2 逼近圓車削之參數設定 61
4.2.3 NC CODE 之撰寫 62
4.3 實作結果與討論 62
第五章 結論與未來展望 64
5.1 結論 64
5.2 未來展望 65
參考文獻 67
附錄A NC CODE 69
附錄B 加工過程照片 87
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