Quality Inspection of Forged Parts
Forged parts refer to metal parts produced by forgery. It is to put directly writing materials into the press, smash it and wait until it is condensed into the shape of the part required by the drawing. The pressing force of the forging should be sufficient and evenly distributed so that the deformation of the workpiece is uniform and the inner stress is minimized.
Inspection and acceptance of forged parts vary from product to product, but there are some general principles and standards that must be followed. Factors that must be considered include:
• Complementarity: The mutual correspondence between the mating surfaces of parts is evaluated.
• Geometric Dimension: Evaluate the shape, size, pitch and location of parts.
• Surface hardness: Detect the hardness of parts, judge the processing technology and metal material.
• Residual stress: The cause of deformation is eliminated as much as possible by controlling the residual stress of parts.
• Non-destructive testing: Non-destructive testing should be used to detect defects and flaws in the parts, such as surface cracks, inclusions and cavities.
• Resonance Detection: By applying a certain vibration frequency to the product and monitoring its response, it is possible to reveal the internal structure and defects of the product.
• X-ray inspection: X-rays are used to locate internal defects and flaws in a part or assembly.
• Stress: Test of parts for endurance and machinability.
• Corrosion resistance test: Test whether the surface and internal parts of the part can withstand corrosion and oxidation.
• Chemical composition test: The purposes are the detect material.
• Thermal shock test: Evaluate the performance of parts when the temperature changes rapidly.
• Durability test: Test the structural integrity of parts when subjected to high stress or pressure.
• Fatigue test: Test the repeated load bearing capacity of parts.
No matter how stringent the quality inspection of the forged parts is, it is impossible to completely eliminate the potential risk of defects. Therefore, the quality of the forged parts should be put in the right place to ensure that these parts in the later use process can reach customers satisfaction with low failure rate.
