【正文】
缸體機械加工自動生產(chǎn)線采用大流量濕式清洗; 檢測 檢測分為在線檢測和線外檢測兩種。 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)動機缸體平面加工的主要手段,國內(nèi)銑削進給量一般為300400mm/min,與國外銑削進給量 20214000 mm/min 相比,相差甚遠,有待于提高,因此,提高銑削進給量,縮短輔助時間,是提高生產(chǎn)效率的主要途徑,發(fā)動機缸體精加工一些平面時的銑削進給量達到 2399mm/min,大大提高了效率; 頂面的銑削是缸體加工中的一個關(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)動機缸體的機械加工過程中,安排粗加工工序,對毛坯全面進行粗加工,切去大部分余量,以保證生產(chǎn)效率; 半精加工階段 在發(fā)動機缸體的機械加工過程中,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,而對要求高的表面進行半精加工,為以后的精加工做準備; 精加工階段 對精度和表面粗造度要求高的表面進行加工; 次要小表面的加工 如螺紋孔,可以在精加工主要表面后進行,一方面 加工時對工件變形影響不大,同時廢品率也降低;另外,如果主要表面出廢品后,這些小表面就不必再加 工了,從而避免浪費工時。加工精度較高的表面,往往要經(jīng)過多次加工;而對于加工精度低的表面,只要經(jīng)過一兩次就行了。在缸體生產(chǎn)線中,我們采用側(cè)面作為粗基準; 精基準 粗基準對于發(fā)動機缸體這種箱體零件來說,一般采用“一面兩銷”為全線的統(tǒng)一基準。對于發(fā)動機缸體生產(chǎn)線,可在零件上線前粗銑六個面,去除大部分余量,便于零件直接上線。缸體在加工前進行時效處理,以消除鑄件內(nèi)應(yīng)力和改善毛坯的力學性能。 3. 發(fā)動機缸體機械加工工藝設(shè)計的主要內(nèi)容 發(fā)動機缸體結(jié)構(gòu)復雜,精度要求高,尺寸較大,是薄壁零件,有若干精度要求較高的平面和孔。 1. 變速箱殼體 的工藝特點 變速箱殼體 的工藝特點是:結(jié)構(gòu)、形狀復雜;加工的平面和孔比較多;壁厚不均,剛度低;加工精度要求高,屬于典型的箱體類加工零件。 Cleaning Cleaning is divided into wet cleaning and dry cylinder automatic production line using a large flow of wet cleaning。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。 secondary processing Secondary processing such as small surface screw holes, you can finish of the major surface after the one hand, when the workpiece deformation process little impact at the same time also reduced the rejection rate。 Fine reference base Refined the base of this box for the engine block parts, the general use of side two sales for a full range of uniform benchmarks, For the longer automated production positioning. In the gearbox shell of the process, we have adopted to the side, bottom and the spindle hole positioning, in the processing center on the process. Machining Processing Stages and processes of the arrangements Often a part of many apparent need for processing, of course, the surface machining accuracy are different. Processing of high precision surface, often after repeated processing。 based on the enterprises ability to actively adopt advanced process technology and equipment, and constantly enhance their level of technology. Gearbox shell machining