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(1) 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;
(2) semi-finishing phase of the engine block machining, in order to ensure the accuracy of some important surface processing, and arrange some semi-finishing operations, will be required accuracy and surface roughness of the surface of the middle of some processing to complete, while demanding the surface of semi-finished, to prepare for future finishing;
(3) The finishing stage of requiring high accuracy and surface roughness of the surface processing;
(4) 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; In addition, if the main surface of a waste, these small the surface will not have to be processed, thus avoiding a waste of man-hours. However, 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 main surface finishing;
(5) should make proper arrangements for secondary processes such as product inspection process, in part roughing stage, the key process before and after processing, spare parts all the processing has been completed, should be appropriate arrangements. Stage of processing pision, has the following advantages: First, it can take measures to eliminate the rough workpiece after the stress, to ensure accuracy; second, finishing on the back, and will not damage during transport the surface of the workpiece has been processed; again, first roughing the surface defects can be detected early and promptly deal with rough, do not waste working hours. But most small parts, do not sub very thin. 3.4 cylinder surface of the main processing and secondary processes Cylinder surface and support the main processing operations are:
(1) plane processing At present, the milling of engine blocks is the primary means of planar processing, domestic milling feed rate is generally 300-400mm/min, and foreign 2000-4000mm/min milling feed rate compared 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 2399 mm / min, greatly improved efficiency;
Top surface of the cylinder milling is a key process in the process, the flatness requirements for 0.02/145mm, the surface roughness of Ra1.6um. Processing in the cylinder, the use of side and spindle bearing bore positioning, top, bottom and middle vagay only aperture while processing used in the processing line outside of the knife device can better meet the engine block machining accuracy ;
(2) General holes machining holes in general are still using the traditional processing of drilling, expansion, boring, reaming, tapping and other craft approach. Issues in the design process of specific programs, use of coated cutting tools, cutting tools and other advanced tools within the cooling, and using a large flow of cooling systems, greatly improving the cutting speed, improved productivity;
(3) deep hole processing of the traditional processing method is used to grade twist drill feed, low efficiency of their production, processing and quality is poor. The deep hole in the engine block processing, the use of gun drilling process;
(4) The three-axis machining holes for the cylinder-axis 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 pre-processing, that is, semi-circular 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 post-order processing; in crankshaft machining processing center hole, using double-sided 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.