车辆毕业设计变速箱箱体加工工艺与专用机床夹具设计（全套CAD图纸）.pdf

摘 要 本次设计是汽车变速箱箱体零件的加工工艺 规程及一些工序的专用夹具设计。汽 车变速箱箱体零件的主要加工表面是平面及孔系。保证平面的加工精度要比保证孔系 的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的加工明确的划 分为粗加工和精加工阶段，以保证孔系的加工精度。基准选择以变速箱箱体的输入轴 与输出轴的支承孔作为粗基准，以顶面与两个工艺孔作为精基准。主要加工工序安排 先以支承孔系定位加工出上表面。再以顶平面与支承孔系定位加工出孔。整个加工过 程均选用组合机床，夹具选用专用夹具夹紧。加紧方式多选用手动夹紧，夹紧可靠。 本设计要求 “以质量求发展，以效益求生存”，在保证零件加工质量的前提下，提 高了生产率，降低了生产成本，是国内外现代机械加工工艺的主要发展方面方向之一。 通过对变速箱体零件图的分析及结构形式的了解，从而对变速箱体进行工艺分析、工 艺说明及加工过程的技术要求和精度分析。然后再对变速箱体的底孔、轴承孔的加工 进行夹具设计与精度和误差分析，该工艺与夹具设计结果能应用于生产要求。 关键词：变速箱；加工工艺；定位；夹紧；夹具设计 ABSTRACT Thisdesigniscargear-boxpartsprocessingprocedure andsomeprocess ofspecialjig design. Auto gear-box parts of the main processing surface is flat and hole department. Ensurethemachiningprecisionoftheplanethanguaranteeholemachiningprecisionofthe easy is. Therefore, this design follo the principle of after make face first hole. And the pores andplane intoroughmachining clearandprecise machining stage,to ensurethatthe hole is processing precision. Benchmark choose to gear-box input shaft and output axis holes as coarsebenchmark, supportedby end face andtwo crafthole as fineabenchmark. Mainprocessingprocedureinsupportingholeisscheduledtoproducethe 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. Steppingupwaymanychoosemanualclamping,clampingreliable. This design requirements with quality beg development, with benefits of survival, ensurepartsprocessing qualitypremise,higherproductivity andreducedproduction 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.