【導(dǎo)讀】發(fā)動機(jī)缸體是發(fā)動機(jī)零件中結(jié)構(gòu)較為復(fù)雜的箱體零件，其精度要求高，加工工藝復(fù)雜，且加工質(zhì)量的好壞直接影響發(fā)動機(jī)整機(jī)性能，因此，它成為各發(fā)動機(jī)生產(chǎn)廠家所關(guān)注的重點(diǎn)零件之一。發(fā)動機(jī)缸體是發(fā)動機(jī)的基礎(chǔ)零件和骨架，同時又是發(fā)動機(jī)總裝配時的基準(zhǔn)零件。缸體的作用是支承和保證活塞、連桿、曲軸等運(yùn)動部件工作時的準(zhǔn)確位置；保證發(fā)動機(jī)的換氣、冷卻和潤滑；提供各種輔助系統(tǒng)、部件及發(fā)動機(jī)的安裝。頂?shù)酌婕巴呱w止口面粗銑組合機(jī)床本機(jī)床為雙面臥式專用銑床，采用移動工作臺帶動工件，機(jī)床采用進(jìn)口西門子S7-200PLC系統(tǒng)控制，機(jī)床設(shè)獨(dú)立電控柜，切削過程自動化完成，有自動和調(diào)整兩種狀態(tài)；高速立式加工中心matec-30L該加工中心主軸最高轉(zhuǎn)速9000r/min。半精加工階段在發(fā)動機(jī)缸體的機(jī)械加工中，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，將精度和表面粗糙度要求中等的一些表面加工完成，而對要求高的表面

　　

【正文】 ing holes for the cylinderaxis machining holes holes of high precision, long working hours of the restrictive process. Thus, work arrangements, processing methods, tools and so on should be special attention. All cover preprocessing, that is, semicircular hole and the cylinder block main bearing cap of the shortage of processing, its main purpose is to remove blank margin, release stress, to prepare for the postorder processing。 in crankshaft machining processing center hole, using doublesided Boring, boring the first holes in the crankshaft hole at one end to 1 / 2 length, and then turn 180 degrees workbench, from the other end and then bore another 1 / 2 length.(5) The cylinder bore machining cylinder hole cylinder machining processing is a key process in the one, under normal circumstances, the machining process as a rough boring, semifine boring, precision boring and honing. Cylinder bore wall for the early detection of casting defects, eliminate stress, should be thick cylinder boring holes in advance。 due to the structural characteristics of the different cylinder bore, must be in honing process to improve the cylinder bore surface quality. In the highvolume production, the cylinder bore honing generally use the multiaxis grinding machine or honing Automatic Line. Here we use honing automatic lines, from the coarseheng. Fineheng and testing equipment, posed of three。(6) Cleaning Cleaning is divided into wet cleaning and dry cleaning. Machining cylinder automatic production line using a large flow of wet cleaning。(7) Detect points outside the line detection and line detection of two kinds. Quality inspection in the engine block, according to the actual situation with lines outside the detection, the main use of coordinate measuring machine integrated measurements of the cylinder, each 200 samples 15 pieces, each class random one.
cylinder processing the choice of cutting parameters
Engine block choice of cutting parameters including cutting speed, feed rate and feed rate option. As the processing equipment is used in high precision and rigidity of machine tools and highspeed machining centers in order to ensure the efficiency of cutting may be the appropriate choice of cutting a larger amount. The main processing engine block surface plane and bearing bore, cylinder bore holes such as the processing, while the plane and bearing bore, cylinder bore of the processing method is mainly milling and boring, so the discussion here, the choice of cutting parameters are mainly milling and Boring choice of cutting parameters.(1) milling the choice of the amount of usage the choice of milling milling effect is directly related to good or bad. Generally speaking, the choice of dosage milling principles: Face milling cutter should be as much as possible when you first take a larger milling depth and width of milling, and then select the larger milling rate of as much as possible. Milling in a specific amount of choice when many factors involved, but in general, rough milling large margin when the workpiece, processing requirements low, the main consideration of the durability of cutter。 Fine Milling margin is small, high precision machining, improvement in the quality processing of primary consideration。In the engine block of the milling process, the use of machine tools as having a high stiffness, highspeed machine tools, big power, rigidity is good, so has chosen the relatively large amount of cutting.(2) boring dosage amount of choice options under the rough finishing process varies. Rough, the selection of a larger depth of cut, finish, the selection of a smaller depth of cut. Depth of cut determined later, as cutting a large amount of use. In the cutting depth and feed rate after the selection can be a reasonable tool to ensure durability under the conditions of use calculations or lookup table method to determine the cutting speed. In general, the rough, choose a lower cutting speed, finishing, the selection of a higher cutting speed.In the engine block boring process, the selection of machine tools as having a high stiffness, highspeed machine tools, big power, good rigidity。 tool for foreign advanced tools, high quality, rigidity is good, so has chosen the relatively large amount of cutting.
4. SummaryThrough the engine block of the structure and process characteristics of the analysis, discusses the engine block machining process design principles and basis of the choice of cutting parameters, and Uturn at high speed milling and boring, for example, design, analysis of the engine cylinder body of highspeed milling and turnover boring process, and in the processing need to pay attention to.