The machining accuracy requirements of forged flanges are usually specified according to national standards or relevant industry standards. The following is the common forging flange processing accuracy requirements under normal circumstances: Dimensional accuracy: the outer diameter, inner diameter, hole distance, aperture and other dimensions of the flange should meet the design requirements, and within the tolerance range specified in the national standard. Roundness and straightness: The roundness and straightness of the flange refers to the roundness and flatness of the flange, which requires no obvious bending, distortion and other deformation phenomena on the surface of the flange. Hole position accuracy: the hole position on the flange should be accurate, hole spacing, hole deviation should meet the design requirements. Surface quality: The surface of the flange should be smooth and smooth, and there should be no cracks, slag inclusion, weight marks and other defects to ensure that the flange and the gasket are closely matched. In addition, the specific processing accuracy requirements need to be determined according to the actual use and required working conditions. Therefore, in actual production, the specific processing accuracy evaluation and control should be carried out according to relevant standards and engineering requirements.
