| 1．IntroductionRecently, the combination of high efficiency and flexibility is developing trend of civil and abroad automobile motors works With assorted advanced technologies are being utilized in the production of motors, the new method of combination of high efficiency and flexibility is found. Presently the advanced production line of cylinder block and cylinder head consists of high speed MC and partial NC special purpose machines which can exert their advantage and avoid their disadvantage. The combination of high efficiency and flexibility is obtained.The main bearing caps of cylinder block is cast which have two styles, one is single , one casting is machined for one product, the other is clusters which is cut to 5 or more parts after machined. Small main bearing caps adopt the former and big ones adopt the latter.The negative advanced production line of main bearing caps consists of external broaching machine and transfer machines for bolt holes, tile location slot and so on. The machining quality is consistent, automation degree is high.2．Planning scheme The production line for bearing caps and injection pump bracket of the 6 cylinders diesel engine 's block in Dalian diesel engine factory is lagging. The machining operations of them is dispersed, the labor strength of workers is big,the machining quality is not consistent .And the knock and hurt of workpieces are constant during loading and unloading. Some type of oil spout pump bracket can not be produced in our factory now. more advanced machining technology and equipment ,craft material are needed to solve these problems. With regard to the production line for main bearing caps, the main problem is operation dispersing which should be solved first. The main bearing caps external broaching machine is adopted to machine all the external surface, so the operation concentration is gotten because former 7 operations can be replaced by it now. The problem of operation dispersing is solved and manpower is saved .The position precision of the workpiece is improved. The machining process is consistent and need not adjust for a long time and auxiliary time is reduced Because of the consistence of broaching and the wear resistance property of the broach. The bearing caps external broaching machine is mature technology and has been applied widespread abroad . But it was applied seldom in china, the cost of manpower might be concerned. The application of the broaching machine can cause rise of cost for sharping tools, we must solve it, or the machining cost may be great. The casting workblank which have high quality is needed. This broaching machine is vertical,double ram, double table external broaching machine. The maximum pulling capacity is 15 tons, the stroke of ram is 2000. The broach and jig are specially designed for main bearing caps, the broach which is equal to two large built-up broach is held on broach seats by subsections total 53 on 2 seats. 2 seats are respectively held on 2 rams, one on left the other on right, 2 jigs are respectively held on 2 tilt swivel tables. Each jig holds 2 workpieces whose machining surfaces are different: thus we have 4 stations with corresponding broachs on seats together. All external surfaces of one workpiece is machined through loading and unloading for 4 times from left to right, and at same time, the rams up and down for 4 times. Of course every cycle only one woekpiece is machined though 4 stations are filled up with 4 workpieces.The drilling machine for bolt holes of main bearing caps is very key equipment, its efficiency affects efficiency of whole production line. The high efficiency means such as inner coolant whole carbide drill,exchangeable table,NC ram etc. is adopted to increase its efficiency and get rid of bottleneck. Otherwise the datum of jig is changed in order to be suited for workpiece machined by broaching machine.With regard to production line for injection pump bracket the main problem is variety singleness which should be solved. The gradual...
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