Plastic gear processing:
 (1) When the processing quality of parts is high during processing, it is generally not possible to satisfy the request with one operation, but gradually reach the requested processing quality with several operations. In order to ensure the quality of processing and fair use of equipment layout, manpower, processing base parts of the processing process generally according to the nature of the process is not the same, can be divided into roughing, semi-finishing, finishing and finishing the four periods.

  1) During roughing. Its mission is to cut off most of the excess metal on the blank, so that the blank is close to the finished part in shape and size, so the primary intention is to go forward with productivity.

  2) semi-finishing period. Its mission is to achieve a certain degree of precision in the main appearance, with a certain finishing allowance, to prepare for the main appearance finishing (such as finishing, finishing) and to finish some of the main elements such as reaming , Tapping, milling keyway and so on.

  3) finishing period. Its mission is to ensure that the major external appearances reach the specified scale accuracy and surface roughness value requests. The main intention is to ensure the processing quality one-sidedly.

  (2) to distinguish the intent during processing
  1) to ensure the quality of processing. Workpiece in the roughing, removal of the thick metal layer, cutting force and clamping force are relatively large, cutting temperature is relatively high, will cause greater deformation. If you do not distinguish between processing, rough, finishing mixed together, we can not stop the cause of the above-mentioned reasons for processing errors. According to processing during processing, roughing processing errors can be formed by semi-finishing and finishing to correct, processing base and then ensure the quality of parts processing.

  2) fair use of equipment layout. Roughing allowance, cutting a large amount of choice of large power, stiffness, Shenyang Machine Tool, high efficiency and low accuracy of the machine. Finishing cutting force is small, small damage to the machine, the choice of high-precision machine tools. Such as the development of equipment to deploy their own characteristics of the row, both to advance the productivity, but also extend the life of the equipment layout of the fine set.

  3) to facilitate the real-time discovery of shortcomings. The various shortcomings of the rough, such as casting porosity, sand and the lack of balance, etc., can be found after roughing, to facilitate real-time repair or resolution of the void, so as to avoid a series of processing, the formation of spoils.

  4) easy to organize the heat treatment process. Such as roughing, the same often to stress heat treatment to eliminate internal stress. Finishing before the final quenching and other heat treatment, the deformation can be refined to be eliminated.