Mechanical property inspection
The mechanical property samples must be cut from forgings taken from the same melting furnace and heat treatment furnace. Sample cutting, sample shape, size, and inspection methods shall be in accordance with national standards.
"Hardness test: This is a commonly used and relatively simple method for judging the mechanical properties of forgings in production. The purpose of hardness test is to ensure that the forgings have normal cutting performance during machining, judge the decarburization condition of the surface of the forgings, and understand the uneven degree of the internal structure of the forgings. Hardness test is generally conducted after heat treatment of the forgings, and Brinell hardness or Rockwell hardness tester can be used.".
Tensile test: measure the yield limit, strength limit, elongation, and cross-sectional shrinkage under uniaxial static tension.
Impact test: used to test the toughness of materials or forgings. Impact tests are generally required for parts that are subjected to impact and vibration loads during operation, or work at high temperatures and speeds, such as turbine discs, turbine blades, etc.
Other tests: For some important or large die forgings, or forgings working under special conditions, tests such as fatigue, bending, torsion, high-temperature creep, and endurance strength should also be conducted as required.
Dimensional and Shape Inspection The dimensional and shape inspection of forgings includes visual inspection of appearance, dimensional measurement inspection, and mold structure inspection.
Visual inspection of appearance
This is a commonly used method for inter process inspection. Visually observe whether there are folds or cracks on the surface of forgings Defects such as pressure marks, scars, surface burns, etc. Deeply concealed defects on the surface of forgings are often observed after heat treatment and cleaning.
Dimensional measurement inspection
Including: length, width, height dimensions, geometric tolerances, misalignment, etc. The inspection of forging dimensions is frequent, and the tools used for measurement are divided into general and special ones. General measuring tools include caliper calipers, vernier calipers, etc. When the production volume is large, special tools such as caliper gauges, plug gauges, templates, special fixtures, etc. should be used. Inspection instruments controlled and analyzed by computers can also be used, or optical comparators and optical projectors can be used for dimensional inspection.
Mold structure
Before putting new (or renovated) final and pre forging molds into production, lead samples or mixed metal salt castings should be poured, and the shape and flash condition of the sample should be checked to determine whether the mold bore design is reasonable. After pickling, the first batch of forgings should be checked for fullness and folding to determine the correctness of the design of the forging die fillets, flange ribs, etc. In addition, the trimming quality of forgings should also be checked to determine problems in the design or installation of the trimming die
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