機械類外文翻譯--變速箱殼體機械加工工藝設計-其他專業(yè)-文庫吧資料
2025-01-27 06:08本頁面
【正文】 on a small surface finish prior to the mai n surface finishing。 The finishing stage The finishing stage of requiring high accuracy and surface roughness of the surface processing。 As for the processing of the surface of low precision, only need to go through one or two on the list. Thus, when the development process in order to seize the processing high precision surface, this conflict, the reasonable arrangement processes and rational division stage of processing. Arrange the order of the principle of process is: after the first coarse refined, the first surface after the hole, the first benchmark other. In the engine block machining, the same should follow this principle. roughing stage engine block machining process The arrangements for roughing process, to fully carry out rough rough, trim most of the margin in order to ensure production efficiency。 mainly flat and the hole processing, processing of flat generally use planing, milling methods such as processing, processing of hole used mainly boring, processing and multipurpose drilling holes. As the cylinder plex structure. so how to ensure that the mutual position of the surface processing precision is an important issue. The selection of blank Gearbox shell on the materials used are generally gray cast iron HT150,HT200,HT250,there is also cast aluminum or steel plate, this engine block using highstrength alloy cast iron. Cylinder in the processing prior to aging treatment in order to eliminate stress and improve the rough casting mechanical properties. Improve the rough accuracy, reduction of machining allowance, is to improve the automated production line system productivity and processing quality of the important measures. As the foreign boxtype parts of rough quality and high precision, and its productionline system has been implemented directly on the blank line, not only eliminating the need for blank check device also saves the rough quality problems due to waste of machining time, increase overall efficiency. Therefore, the refinement of rough is to improve the productivity of the most promising way out. For the engine block production line, can be rough in parts online premilling six face, removing most of the margin, to facilitate direct online parts. Machining process selection and processing of the benchmark Choose the right processing technology base is directly related to the processing quality can ensure the parts. Generally speaking, process benchmarking can be divided into coarse and fine reference base. Coarse reference base The baseline for the online thick rough ,which is particularly important the choice of benchmark crude, if crude benchmark choice unreasonable, will the uneven distribution of machining allowance, processing and surface offsets, resulting in
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