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  • CDX (HK) INTL INDUSTRIAL LIMITED
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  • Machining Knowledge Of Precision Machine Parts
    Dec 06, 2018

    In the common Machining process, there are CNC Machining, CNC turning, Auto lathe turning,CNC Milling, Stamping, Sheet metal fabrication, Casting, Injection molding etc


    The machining of precision mechanical parts is the process of changing the size or performance of workpiece by machine. According to the temperature state of the workpiece, it is divided into cold working and hot working. Usually mechanical processing at room temperature without causing chemical changes in the workpiece is called cold working. Generally speaking, the process above or below normal temperature will cause chemical changes in workpiece machining is called hot processing. Cold working can be divided according to different machining methods. It is used in cutting and pressure machining. Hot working is often used in heat treatment, calcination, casting and welding.


    The machining process of precision mechanical parts refers to the whole process of manufacturing products from raw materials (or semi-finished products). It is used in machining production, including transportation and preservation of raw materials, production preparation, rough processing, parts processing and heat treatment, product assembly and commissioning, painting and packaging. From the point of view of hardware, the machining of mechanical parts is carried out through a variety of mechanical equipment, such as automobile, milling machine, planer, grinder, broaching machine, machining center. Therefore, in order to achieve a certain accuracy, we need to select the appropriate machining process and machining equipment.


    Machining methods of Precision Machine parts:


    1. In order to ensure machining precision, rough machining and finishing machining should be carried out separately. As a result of rough machining, a large number of workpieces are subjected to cutting force, large clamping force, more heat, easy to cause surface hardening, the workpiece has a very large internal stress, if finishing and rough processing is continuous, Precision machine parts machining accuracy will be redistributed with the stress, and will be lost soon. For some parts with high machining accuracy. Low-temperature annealing or aging should be carried out after rough machining and before finishing to eliminate internal stress.


    2. Reasonable selection of machining equipment. The main process of rough machining is to cut off most of the machining allowance without requiring higher machining accuracy. Therefore, roughing machine tools only need high power, low precision machining. Precision machine parts need more precise machine tools. Roughing and finishing on different machine tools can not only give full play to the performance of the equipment, but also prolong the service life of precision machine tools.


    3. Heat treatment is often required during machining. The process of heat treatment is arranged as follows: in order to improve the cutting performance of metals, such as annealing, normalizing, tempering, etc., usually takes place before machining. In order to eliminate internal stress, such as aging treatment and tempering treatment, generally after rough processing, before finishing. In order to improve the mechanical properties of parts, Carburizing, quenching, tempering and so on, generally after mechanical processing. If there is deformation after heat treatment, the processing process must be rearranged.


    CNC Machining