Automobile various parts processing technology and tools used (2)

Shell parts processing

Most of these parts belong to the flat and porous thin-walled parts structure, which has poor rigidity and high precision for the hole position. Therefore, most of the foreign countries use machining centers for processing.

The boring of the spherical surface in the differential housing adopts the spindle built-in machine tool, and the push-pull rod reciprocates axially, which drives the boring head to move in a semi-circular trajectory in two dimensions, superimposes the rotary motion of the casing, and completes the spherical forming boring process in one pass. According to the multi-variety demand of the product market, China has formed a trend of shifting from the production line of a large number of dedicated combination machine tools to the flexible production line consisting of CNC machine tools and machining centers. The semi-automatic off-line measurement is performed by a coordinate measuring machine, and the detection precision is high, but the efficiency is not high.

Grinding

In the plane grinding, most of the domestic large-scale high-precision grinding machines are used, the grinding roughness is Ra=0.5μm, and the grinding speed is 8.0m/s.

Cylindrical grinding uses high-precision CNC cylindrical grinding machines.

Internal grinding is carried out in China using a high-precision internal grinding machine with a grinding roughness Ra = 0.2 μm.

Stainless steel electrode

The future development trend is: in the aspect of cylindrical gear processing, it will solve the problem of precision and rigidity of domestic machine tools, solve the problem of tool material and its life, develop high-speed hobbing and hard tooth surface processing technology; develop radial shaving and stable tooth decay process Introduce CNC gear processing machines to improve the overall processing level. In the aspect of bevel gear processing, the precision forging process is developed to process straight bevel gears in order to improve efficiency and reduce cost; for spiral bevel gears, a perfect spiral bevel gear trial system will be gradually formed. Design, strength analysis, trial production, testing and production preparation will form a complete software and hardware environment, solve the key technology of pre-production cutting technology; have high-precision, low-noise gear development and development capabilities; effectively undertake new products Trial production and production of small-volume, high-precision special-purpose gears; refine the assembly process, determine reasonable quality inspection links and process tempo, and determine corresponding technical measures for different requirements of different gear products; gear trial production and production workshops should be equipped with Gear detection center for automatic detection and reduction of human error. In the processing of housing parts, the high-speed machining center module system will be used to process the shell parts, and the production line will be matched with the CMM or the automatic measuring instrument to realize automatic or semi-automatic online detection. In the processing of various planes, the development of large-plane high-speed high-precision grinding machine grinding plane with roughness of Ra=0.5μm will be developed; development of powerful grinding machine, high-precision CNC cylindrical grinding machine and point grinding process for grinding outer circle; The high-precision internal grinding machine grinds the inner circular surface with a roughness of Ra=0.2 μm.

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