Dimension and shape inspection of universal joint die forgings. Visual inspection of appearance is a widely used method. The forged surface can be observed with naked eyes for wrinkles, cracks, extrusion, scars, surface burning and other defects. However, there are hidden deep defects on the surface of die forgings, which are usually observed after heat treatment and cleaning. However, its dimensions include length, width and height. The parallelism and perpendicularity of the plane; Processing degree of bending pipe of axis; Ovality of inner and outer circles; Fillet radius; Concentricity; Angle and displacement, etc.

When accurate dimensional inspection is required for die forgings, in addition to marking inspection and special template, the inspection instrument controlled and analyzed by computer, or optical comparator and optical projector can also be used for relevant dimensional inspection to ensure the accuracy of inspection results.

At the same time, the mechanical properties of die forgings were also tested. Relevant samples must be cut from forgings taken from the same smelting furnace and the same heat treatment furnace. The cutting of samples, the shape, size and inspection method of samples shall be in accordance with the national standards. The test items include hardness test, extension test, impact test and other tests.