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Do you know the quality inspection items of forgings? Follow the small series of rear axle half shaft sleeve to have a simple understanding and have a look!

1. Geometry and dimensions

The overall dimensions of forgings can be tested by measuring tools (such as steel ruler, caliper and template); Forgings with complex shapes can be detected by marking.

2. Surface quality

If there are cracks, crushing defects or folding defects on the surface of the forging, they can usually be found with the naked eye. Sometimes the cracks are small and the depth of the folds is unknown and can be observed after cleaning the shovel. If necessary, the defect detection method can be used for inspection.

3. Internal organization

Whether there are cracks, inclusions, looseness and other defects in the forging, the macro structure of the forging can be checked with the naked eye or 10-30 times magnifying glass. The commonly used method in production is acid etching inspection, that is, cutting samples at the parts of forgings to be inspected and etching with acid solution can clearly show the defects of macro structure on the section, such as forging streamline distribution, cracks and inclusions.

4. Metallographic examination

The inspection method of observing the fracture structure of forgings with metallographic microscope can check the carbide distribution, grain size and decarburization depth.

5. Mechanical property

The test items of mechanical properties are mainly hardness, tensile strength and impact toughness. Sometimes, cold bending test and fatigue test can also be carried out according to the design requirements of parts.