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          CNC machining center work accuracy inspection experience sharing

          source: time:2019-10-23 09:10:01

          In the CNC industry, the accuracy of CNC machining center work will directly affect the quality and output of products, so the accuracy inspection of CNC machining center work is the top priority of the company. Today, the company will share some experience about the accuracy inspection of machining center work.

          (I) positioning of test piece

          The test piece shall be placed in the middle position of the x stroke and along the Y and Z axis at a proper position suitable for the positioning of the test piece and fixture and the length of the tool. NC machining is a process method of machining parts on NC machine tools. The process procedures of NC machine tools and traditional machine tools are generally consistent, but there are also obvious changes. The machining method of controlling the displacement of parts and tools with digital information. It is an effective way to solve the problems of variable parts, small batch, complex shape, high precision and to realize high efficiency and automatic machining. When there are special requirements for the positioning position of the test piece, they shall be specified in the agreement between the manufacturer and the user

          (II) fixation of test piece

          The test piece shall be installed on the special fixture for convenience to achieve the maximum stability of the tool and fixture. CNC machining generally refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring milling machine, etc. The feed path of finish machining is basically carried out along the contour sequence of its parts. Therefore, the key work of determining the feed path is to determine the feed path of rough machining and empty stroke. The mounting surface of clamps and test pieces shall be straight.

          The parallelism between the mounting surface of the test piece and the clamping surface of the fixture shall be inspected. Suitable clamping methods shall be used so that the tool can penetrate and machine the full length of the center hole. It is recommended to use countersunk screws to fix the test piece so as to avoid interference between the cutter and the screw. Other equivalent methods can also be used. The total height of the test piece depends on the fixing method selected.

          (3) material, cutter and cutting parameter of the test piece

          The materials, cutting tools and parameters of the test piece shall be selected according to the agreement between the manufacturer and the user, and shall be recorded. The recommended cutting parameters are as follows:

          1. Cutting speed: cast iron casting is about 50M / min; aluminum casting is about 300m / min.

          2. Feed rate: about (0.05 ~ 0.10) mm / tooth.

          3. Cutting depth: the radial cutting depth of all milling processes shall be 0.2mm.

          (IV) size of test piece

          If the test piece is cut several times, the overall dimension is reduced and the aperture is increased. When it is used for acceptance inspection, it is recommended to select the final profile processing test piece size to be consistent with that specified in this standard, so as to accurately reflect the cutting accuracy (accuracy) of the machine tool. The test piece can be used repeatedly in the cutting test, and its specifications shall be kept within 10% of the characteristic dimensions given in this standard. When the test piece is used again, a thin layer cutting shall be carried out to clean all surfaces before the new finishing test.

          It is hoped that these experiences can play a reference role in the accuracy test of CNC machining center. CNC machining generally refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring milling machine, etc. The feed path of finish machining is basically carried out along the contour sequence of its parts. Therefore, the key work of determining the feed path is to determine the feed path of rough machining and empty stroke.


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