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攀枝花學院本科畢業(yè)設計（論文） 摘 要
摘 要
本設計是車床撥叉零件的加工工藝及專用夾具設計。從零件的結構外型分析，它的外型復雜，且不易加工，因此該零件選用是鑄造件。它的主要加工面是孔、撥叉叉口兩端面和槽，在加工中由于面的加工精度要比孔的加工精度容易保證。因此，在設計中采用先面后孔的原則，并將孔與平面的加工劃分為粗加工和精加工階段，以保證加工精度。在本設計中，先以一個面加工出一個基準面，然后，再以該基準面加工相應的孔。在后面的工序中，均以該孔為定位基準，加工撥叉叉口兩端面、孔、底平面、槽和斜平面，在整個加工過程中，分別采用了銑床、鉆床和鏜床。并設計了銑側面、鏜孔和銑槽等的專用夾具，并對它們的定位都采用了一面兩銷定位。由于該零件的尺寸不大，所需的夾緊力不大。因此，夾緊方式都采用手動夾緊，它的夾緊簡單，機構的設計更為方便，滿足夾緊要求。
關鍵詞 撥叉零件，加工工藝，專用夾具，定位， 夾緊
II
攀枝花學院本科畢業(yè)設計（論文） ABSTRACT
ABSTRACT
This design is a lather plectrum parts processing and special fixture designs. Parts from the appearance of the structure, its appearance complex and difficult process, so the selection of parts is casting.The parts are cast parts. In the processing, it is easier to ensure the processing accuracy of plane than the hole. So the parts’ main planes are hole, two blades of the Plectrum and groove. Therefore, in the design, it adopts the principle of plane first and hole second and divides the hole and plane’s working into extensive and intensive processing stages so as to ensure the accuracy. In this design, firstly, it uses the plane to work a datum; secondly, it uses the datum to work according hole. And in the latter process of working, it also takes hole as the poisoning base and works the two bales of Plectrum, hole, bottom plane, groove and inclined plane. In the entire machining process, it uses separately the milling machine, driller and boring machine. And the design aspect of milling, boring and milling ducts special fixture. They also have adopted the positioning of a two marketing positioning. According to the requirement, it designs the special fixture. For the size of parts is not very big, it doesn’t require strong clamping force. Therefore, methods of clamping are manual clamping; that is because it is simple and the design is more convenient to meet the requirements of clamping.
Keywords Plectrum Parts, Processing, Special Fixture, Positioning, Clamping