(a) The positioning test piece of the test piece shall be located at the middle position of the X stroke, and be placed along the Y and Z axes at appropriate positions suitable for the positioning of the test piece and the jig and the length of the tool. When there is special requirement on the positioning position of the test piece, it shall be specified in the agreement between the manufacturer and the user (II). The fixed test piece of the test piece should be installed on the special fixture to achieve the maximum stability of the tool and fixture. . The mounting surface of the fixture and specimen should be straight. The parallelism between the mounting surface of the test piece and the holding surface of the fixture should be checked. Suitable gripping methods should be used so that the tool can penetrate and machine the entire length of the center hole. It is recommended to use countersunk screws to secure the test piece to avoid interference between the tool and the screw. Other equivalent methods may also be used. The total height of the test piece depends on the fixed method chosen.
(3) The material of the test piece, the material of the test piece and the material of the cutting parameter test piece, and the cutting tool and cutting parameters are 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 parts about 50m/min; aluminum parts about 300m/min.
2, the amount of feed: about (0.05 ~ 0.10) mm / tooth.
3. Depth of cut: The depth of cut of all the milling operations should be 0.2mm. (IV) The size of the test piece If the test piece is cut several times, the overall dimensions will be reduced and the hole diameter will be increased. When used for acceptance inspection, it is recommended The dimensions of the final contoured test specimen are the same as those specified in this standard in order to accurately reflect the cutting accuracy of the machine tool. The test piece can be used repeatedly in the cutting test, and its specifications should be kept within 10% of the characteristic dimensions given in this standard. When the test piece is used again, a thin layer cut should be performed to clean all surfaces before performing a new intensive cut test.
(3) The material of the test piece, the material of the test piece and the material of the cutting parameter test piece, and the cutting tool and cutting parameters are 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 parts about 50m/min; aluminum parts about 300m/min.
2, the amount of feed: about (0.05 ~ 0.10) mm / tooth.
3. Depth of cut: The depth of cut of all the milling operations should be 0.2mm. (IV) The size of the test piece If the test piece is cut several times, the overall dimensions will be reduced and the hole diameter will be increased. When used for acceptance inspection, it is recommended The dimensions of the final contoured test specimen are the same as those specified in this standard in order to accurately reflect the cutting accuracy of the machine tool. The test piece can be used repeatedly in the cutting test, and its specifications should be kept within 10% of the characteristic dimensions given in this standard. When the test piece is used again, a thin layer cut should be performed to clean all surfaces before performing a new intensive cut test.
Class 900 or 900LBS is a pressure rating of ANSI (ASME) B16.5 or B16.47 flange standard, the full rating class of ANSI (ASME) are class 75, class 150, class 300, class 600, class 900, class 1500 and class 2500, Class 900 or 900LBS is very popular using for ANSI (ASME) B16.5 flanges norms, this pressure flange type have slip on, weld neck, blank, threaded, socket weld and lap joint.
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