After entering the 21st century, the engine crankshaft has undergone tremendous changes in the manufacturing process, cutting tools, etc., which are many different from the previous processing technology. The multi-tool turning process and manual grinding process that have led for nearly half a century will gradually withdraw from the historical stage due to low machining accuracy and poor flexibility. High-efficiency composite processing technology and equipment have rapidly entered the automobile and parts manufacturing industry, and the high-efficiency composite processing technology of crankshafts has been applied to a considerable extent in the industry, which will represent the future development trend of this industry

    The old domestic crankshaft production lines are mostly composed of ordinary machine tools and special machine tools, and the production efficiency and automation are relatively low. Rough machining equipment generally uses multi-tool lathes to turn crankshaft main journals and connecting rod journals. The quality stability of the process is poor, and it is easy to generate large machining stress, making it difficult to achieve a reasonable machining allowance. Ordinary crankshaft grinders are mostly used for finishing, rough grinding-semi-finishing-finishing-polishing, usually by manual operation, with unstable processing quality and poor dimensional consistency. One of the main characteristics of the old-fashioned production line is that there are too many ordinary equipment. Calculated by processing the ductile iron crankshaft, a production line has 35 to 40 pieces of equipment. The author once inspected a forged steel crankshaft production line in the south. The main journal and connecting rod journal were processed by ordinary external milling for rough machining, and then the main journal and connecting rod journal were CNC fine-turned, and then transferred to finishing machining through multi-process grinding. process. The production line has more than 60 equipments, the product turnover line is long, and the site occupies a large area. The production efficiency is completely improved by the decomposition process and margin of multiple equipments.

     However, today's engine crankshaft manufacturing industry is facing the following problems:

(1) Multi-variety and small-batch production.

(2) The lead time is greatly shortened.

(3) Reduce production costs.

(4) The emergence of difficult-to-cut materials has significantly increased the difficulty of processing, and many issues that need to be solved have been raised during processing, such as hard cutting.

(5) In order to protect the environment, it is required to use less or no cutting fluid, that is, to achieve dry cutting or quasi-dry cutting.

    It is precisely based on the above-mentioned new situation that since entering the 21st century, the high-efficiency composite processing technology and equipment automobile manufacturing industry have been rapidly applied, the production efficiency has been greatly improved, and the number of production equipment for the engine crankshaft production line has been reduced. The author I once saw in a car engine crankshaft production line that there are only about 13 pieces of equipment in the whole line, the product turnover line is short, the processing efficiency is high, and the quality management is easy.