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黑龍江工程學院本科生畢業(yè)設計
摘 要
本次設計是汽車變速箱箱體零件的加工工藝 規(guī)程及一些工序的專用夾具設計。汽車變速箱箱體零件的主要加工表面是平面及孔系。保證平面的加工精度要比保證孔系的加工精度容易。因此，本設計遵循先面后孔的原則。并將孔與平面的加工明確的劃分為粗加工和精加工階段，以保證孔系的加工精度。基準選擇以變速箱箱體的輸入軸與輸出軸的支承孔作為粗基準，以頂面與兩個工藝孔作為精基準。主要加工工序安排先以支承孔系定位加工出上表面。再以頂平面與支承孔系定位加工出孔。整個加工過程均選用組合機床，夾具選用專用夾具夾緊。加緊方式多選用手動夾緊，夾緊可靠。
本設計要求“以質(zhì)量求發(fā)展，以效益求生存”，在保證零件加工質(zhì)量的前提下，提高了生產(chǎn)率，降低了生產(chǎn)成本，是國內(nèi)外現(xiàn)代機械加工工藝的主要發(fā)展方面方向之一。通過對變速箱體零件圖的分析及結(jié)構形式的了解，從而對變速箱體進行工藝分析、工藝說明及加工過程的技術要求和精度分析。然后再對變速箱體的底孔、軸承孔的加工進行夾具設計與精度和誤差分析，該工藝與夾具設計結(jié)果能應用于生產(chǎn)要求。
關鍵詞：變速箱；加工工藝；定位；夾緊；夾具設計
A BSTRACT
This design is car gear-box parts processing procedure and some process of special jig design. Auto gear-box parts of the main processing surface is flat and hole department. Ensure the machining precision of the plane than guarantee hole machining precision of the easy is. Therefore, this design follow the principle of after make face first hole. And the pores and plane into rough machining clear and precise machining stage, to ensure that the hole is processing precision. Benchmark choose to gear-box input shaft and output axis holes as coarse benchmark, supported by end face and two craft hole as fine a benchmark. Main processing procedure in supporting hole is scheduled to produce the surface. Location Then with the plane and supporting hole is positioning processed from holes. The whole process are chosen combination machine tools, clamping fixture choose special jig. Stepping up way many choose manual clamping, clamping reliable.
This design requirements "with quality beg development, with benefits of survival", ensure parts processing quality premise, higher productivity and reduced production cost, is domestic and international modern machining technology is one of the main development direction. Based on the analysis of the body parts drawing variable structure and form of understanding, thus the process of speed changing process explanation and analysis, the processing of technical requirements and precision analysis. Then in the variable speed cabinet of bearing hole and the clamping fixture design and precision machining procedure and the error analysis, this technology and fixture design results can be applied to production requirements.
Key words: gearbox; Processing technology; positioning; Fixture design; Clamping force
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