NC Machining Technology is based on three fundamental principles


Date & time Jul 20
cnc parts
Creator Bevis Kitty

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Bevis Kitty


NC Machining Technology is based on three fundamental principles
  1. The principle of maximum concentration of working procedures and one-time positioning of the work environment
    CNC machine tools, particularly machining centers, have the ability to consolidate parts and processes to the greatest extent possible in most cases. That is to say, parts should be capable of completing the majority, if not all, of the processes that can be performed by this CNC machine tool in a single clamping operation. As cnc turn machining becomes more prevalent, it has the potential to consolidate processes, reducing the number of machine tools and clamping times of workpieces while also reducing unnecessary positioning error and increasing productivity. After one installation, it is necessary to complete all of the processing of the coaxial hole system through sequential continuous tool change, and then process the holes at other positions, in order to eliminate the influence of repeated positioning error and to improve the coaxiality of the hole system.

  2. Second, there is the principle of rough before fine
    As a rule, in NC machining the process should be divided into phases according to the machining accuracy, stiffness and deformation of the parts, with rough machining being completed first, followed by semi-finish machining and finish machining after that. For a specific machined surface, it is recommended that it be finished in the following order: rough machining, semi-finishing, finishing, and finishing. Ruggedizing the machine tool and the cutting tool performance should be given equal consideration in rough machining, provided that machining quality, cutting tool durability, and rigidity of the machine tool fixture tool workpiece process system are all maintained. We should make an cnc parts effort to use a greater number of cutting times in order to achieve the machining condition in which the allowance of each part is as uniform as possible before finishing the piece. Precision and surface quality of parts are primarily ensured during the finishing process, so the final contour of parts should be completed by the last tool used in the process. Generally speaking, the finishing allowance should be between 0.2 and 0.6 mm in order to maintain processing quality. The time between rough machining and finishing machining should be extended in order to allow parts to fully recover from deformation caused by rough machining before finishing machining is performed in order to improve the processing accuracy of parts.

    3) The principles of near first, far later, and face first, hole later are all applicable.
    In general, the part that is closest to the tool setting point is processed first, and the part that is farthest away from the tool setting point is processed last, in order to shorten the tool moving distance and reduce the time spent waiting for the tool to be ready. When turning, it is advantageous to maintain the rigidity of the blank or semi-finished product while also improving the cutting conditions for the tool. When milling planes and boring are required on the same part, the order milling plane first and then boring can be followed. Because of the high cutting force used when milling the plane, the cnc machining manufacturerare prone to deformation during the milling process. Milling the surface first, followed by boring, allows the surface to recover for a period of time after being damaged. It is beneficial to bore the hole after recovering the deformation because it helps to ensure that the hole is machined accurately. Second, if you bore the hole first and then mill the plane, the hole will produce burr and flash, which will interfere with the hole's assembly during the milling process.


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