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Abstract：
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It is very trivial to deploy the reducible elbow pipe approximately to gain the actual length in the drawing geometry & arithmetic way of traditional methods.To build up the mathematics model is difficult.It is easy to make mistakes in the process for sheet metal,leading to the transition part for the deployment of the horizontal drawing and curve drawing and transition lines are not accurate.So the sheet metal will have errors,deformation and inflection glossiness weak in the sheet metal process.According to the Law of the public tangent,the mathematics model of the deploy drawing is put forward by the mathematics induced to develop the twice imbedded in AutoCAD,compile the calculating and drawing program,realize the CAD and processing automation.After being used,the specimen of sheet metal proves that it is truly accurate and reliable.The transition part of specimen is glossy and the changed part size is also accurate.Contrast to hand-drawings,the compiled calculating and drawing program is simple and easy to be applied and can increase the productivity greatly and lower the technician labor tension.
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AuthorIntro：
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Reference：
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[1]孙海林.设计大师AutoCAD2002高级使用篇[M].北京:清华大学出版社,2002.
[2]刘文剑,等.基于事例的工艺设计中形状相似性计算方法[J].计算机集成制造系统,2001,7(9):55 59.
[3]葛友华,等.CAPP系统中的模糊匹配方法[J].东南大学学报(自然科学版),2000,30(2):93 96.
[4]熊火轮,胡世光.板料成形中的计算机辅助技术[M].北京:北京航空航天大学出版社,2004.
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