【正文】 it can take measures to eliminate the rough workpiece after the stress, to ensure 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。 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。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。(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。(4) The threeaxis machining 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。 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.
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 300400mm/min, and foreign 20004000mm/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 2399 mm / min, greatly improved efficiency。(4) secondary processing, such as small surface screw holes, you can finish of the major surfa