【正文】 eaning is divided into wet cleaning and dry cylinder automatic production line using a large flow of wet cleaning。對(duì)于發(fā)動(dòng)機(jī)缸體生產(chǎn)線，可在零件上線前粗銑六個(gè)面，去除大部分余量，便于零件直接上線。 箱體 的主要加工表面和輔助工序 平面加工 目前，銑削是發(fā)動(dòng)機(jī)缸體平面加工的主要手段，國(guó)內(nèi)銑削進(jìn)給量一般為300400mm/min，與國(guó)外銑削進(jìn)給量 20214000 mm/min 相比，相差甚遠(yuǎn)，有待于提高，因此，提高銑削進(jìn)給量，縮短輔助時(shí)間，是提高生產(chǎn)效率的主要途徑，發(fā)動(dòng)機(jī)缸體精加工一些平面時(shí)的銑削進(jìn)給量達(dá)到 2399mm/min，大大提高了效率； 頂面的銑削是缸體加工中的一個(gè)關(guān)鍵工序，其平面度要求為 ，表面粗造度為 。 粗加工階段 在發(fā)動(dòng)機(jī)缸體的機(jī)械加工過(guò)程中，安排粗加工工序，對(duì)毛坯全面進(jìn)行粗加工，切去大部分余量，以保證生產(chǎn)效率； 半精加工階段 在發(fā)動(dòng)機(jī)缸體的機(jī)械加工過(guò)程中，為了保證一些重要表面的加工精度，安排一些半精加工工序，將精度和表面粗造度要求中等的一些表面加工完成，而對(duì)要求高的表面進(jìn)行半精加工，為以后的精加工做準(zhǔn)備； 精加工階段 對(duì)精度和表面粗造度要求高的表面進(jìn)行加工； 次要小表面的加工 如螺紋孔，可以在精加工主要表面后進(jìn)行，一方面 加工時(shí)對(duì)工件變形影響不大，同時(shí)廢品率也降低；另外，如果主要表面出廢品后，這些小表面就不必再加 工了，從而避免浪費(fèi)工時(shí)。缸體在加工前進(jìn)行時(shí)效處理，以消除鑄件內(nèi)應(yīng)力和改善毛坯的力學(xué)性能。again,first roughing the surface defects can be detected early and promptly deal with rough,do not waste working most small parts,do not sub very thin. The gearbox shell surface of the main processing and secondary processes Plane processing Plane processing at present, the milling of engine blocks is the primary means of planar processing,domestic milling feed rate is generally 300400mm/min,and foreign 20214000mm/min milling feed rate pared to far cry,to be on increasing,therefore,improve the milling feed rate,reduce overhead time is to improve the productivity of the major means of finishing a number of plane engine block when the milling feed rate to reach 2399mm/min,greatly improved efficiency。s focus parts process planning must guarantee the machining quality of parts, to meet the technical requirements stipulated in drawings, at the same time should also have high productivity and efficiency. Therefore, machining process planning design is an important work, requires designers must have a rich experience in production practice and wide range of mechanical manufacturing technology basic theory knowledge. In the specified procedure, should according to the production of parts and the existing equipment conditions, taking the processing quality into account, productivity and economy requirements, after repeated analysis and parison, to determine the optimal or the best solution. Characteristics of the gearbox shell The gearbox shell process features are: the structure of plex shape。In addition,if the main surface of a waste,these small the surface will not have to be processed,thus avoiding a waste of ,if the processing is very easy for a small surface bumps the main surface,it should be placed on a small surface finish prior to the mai n surface finishing。發(fā)動(dòng)機(jī)缸體機(jī)械加工的工藝特點(diǎn)是：主要是平面和孔的加工，加工平面一般采用刨、銑削等方法加工，加工孔主要采用鏜削，加工小孔多用鉆削。因此，擬定工藝順序時(shí)，要抓住“加工精度高的表面”這個(gè)矛盾，合理安排工序和合理劃分加工階段。在發(fā)動(dòng)機(jī)缸體深油孔的加工中，采用槍 鉆工藝； 清洗 清洗分為濕式清洗和干式清洗。 粗基準(zhǔn) 粗基準(zhǔn)對(duì)于上線的毛坯，其粗基準(zhǔn)的選擇尤為重要，如果粗基準(zhǔn)選擇不合理，會(huì)使加工余量分布不均勻，加工面偏移，造成廢品。因此，機(jī)械加工工藝規(guī)程設(shè)計(jì)是一項(xiàng)重要的工作，要求設(shè)計(jì)者必須