應用加工特徵辨識於車削旋轉件之加工規劃

Implementation of Machining Planning for Turning Rotational Parts Based on Machining Feature Recognition

洪秉暉(Ping-Hui Hung)

指導教授 ： 蔡曜陽

國立臺灣大學/工學院/機械工程學研究所/碩士(2019年)

https://doi.org/10.6342/NTU201902015

摘要

雖然目前市面上已經存在許多運用特徵辨識功能做自動加工規劃的CAE(Computer Aided Engineering)軟體，但是其中對於車削件加工輪廓的規劃並不全然符合實際加工中的切削邏輯，此外許多加工製程的參數還是需要人工輸入，例如換面工序的加工範圍判斷及夾持位置。
本研究提出一基於車削加工特徵辨識，而發展出符合車削件加工邏輯的加工規劃。故本研究中的特徵辨識，並不是單純的將工件輪廓進行幾何關係的運算，而是從加工工法的角度對特徵做分類，且由實際加工中的重要法則及判斷邏輯，作為夾持位置、加工輪廓規劃和工序排序的依據。
經由11個業界工件和2個競賽試題工件的輪廓加工特徵驗證皆能成功辨識，自動選出使用者目前刀塔上較合適的刀具。比較目前商用軟體後，發現本系統能依照現有胚料規格和輪廓特徵，判斷出合理的外輪廓換面工序的夾持位置、內輪廓換面工序的加工範圍，以及符合實際加工邏輯的加工輪廓和工序的規劃，並且成功連結至工研院智慧機械中心所開發之CAM軟體(i-Turn系統)進行模擬及輸出NC碼，主要貢獻為開發車削件加工規劃CAPP系統，包括經由凹槽輪廓、車刀下挖之判斷，能順利地將複雜車削件輪廓作加工規劃，以及將CAM軟體間的加工資訊做自動分析判斷。

關鍵字

加工特徵辨識 ； 加工輪廓規劃 ； 工序規劃 ； 換面工序判斷 ； 夾持位置選擇

並列摘要

Although there are many CAE softwares that use feature recognition to make processing planning, there are still a lot of processing information that need to be input manually, such as processing range judgment and clamping position of the first and second face processes. And the planning of the machining contour does not match the cutting logic of the actual machining.
In this study, based on feature recognition of turning processing, the actual processing logic and rules are added to the algorithm in order to make correct and effective processing planning for turning rotational parts. Therefore, the feature recognition in this study is not only simply a geometrical relationship between the contours of the workpiece, but also classify features from the point of view of processing methods. And the rules and judgment logic in actual processing are also introduced as the basis for clamping position, machining contour planning, and process sequencing.
In the results of this study, the workpiece features that are often found in the industry can be successfully recognized, and the appropriate tool on the current turret is automatically selected by the user. The advantages compared with current commercial software is that can according to the actual processing logic, the existing blank specification and contour feature can be used to determine the reasonable outer contour of the first and second surface clamping surfaces, the inner contour first surface and the second surface processing range. As well as machining contour planning and process generation in line with the actual machining logic, the main contribution is the development of intelligent CAM software.

並列關鍵字

Machining Feature Recognition ； Machining Contour Planning ； Process Planning ； The First and Second Process Determination ； Clamping Position

參考文獻

[1] Ersan Aslan, Ulvi Seker, Nedim Alpdemir, 1999, Data Extraction From CAD Model For Rotational Parts to be Machined at Turning Centres, Engineering and Environmental Science, Vol.23, pp.339-347.

[2] Jinn-Jong Sheu, 1998, A Computer Integrated Manufacturing System for Rotational Parts, INT. J. COMPUTER INTEGRATED MANUFACTURING, Vol. 11, No. 6, 534-547.

[3] Leo Alting, Hong-Chao Zhang, 1989, Computer Aided Process Planning: the state-of-the-art survey, INT. J. PROD. RES., Vol. 27, No.4, pp. 553-585.

[4] A. EI Maraghy, 1993, Evolution and Future Perspectives of CAPP, Annals of the ClRP Vol. 42.

[5] RONG-KWEI LI, 1988, A part-feature recognition system for rotational parts, INT. J. PROD. RES., Vol.26, No.9, pp. 1451-1475.