What is the content of forging qualityinspection?
Theexistence of forging defects may affect the processing quality or processingquality of the subsequent processes, and some seriously affect the performanceand use of the forgings, and even greatly reduce the service life of thefinished parts and endanger safety.
Therefore, in order to ensure or improvethe quality of cold forgings, inaddition to strengthening quality control in the process and takingcorresponding measures to prevent the occurrence of forging defects, necessaryquality inspections should also be carried out to prevent subsequent processes(such as heat treatment, surface treatment, cold processing, etc.). ) Andforgings with defects that have adverse effects on performance will flow intothe subsequent process. After quality inspection, remedial measures can betaken on the forgings made according to the nature of the defect and the degreeof influence to use, so that it meets the technical standards or requirementsfor use. Therefore, in a sense, the quality inspection of forgings, on the onehand, is to check the quality of the forgings that have been made, and on theother hand, to point out the improvement direction for the forging process, so as to ensure thatthe quality of forgings meets the requirements of forging technical standardsand meets the design Requirements on processing and use.
Forging
Thequality inspection of hot forgingsincludes the inspection of appearance quality and internal quality. Appearancequality inspection mainly refers to the inspection of the geometric size,shape, surface condition and other items of the forging; the internal qualityinspection mainly refers to the inspection of various items such as thechemical composition, macrostructure, microstructure and mechanical propertiesof the forging. Specifically, the appearance quality inspection of forgings isto check whether the shape and geometric dimensions of the forgings meet thespecifications of the drawings, whether the forgings have defects on thesurface, what kind of defects are they, and what are their morphologicalcharacteristics. The inspection content of the surface condition is generallyto check whether the forging surface has surface cracks, folds, wrinkles, pits,orange peel, blisters, scars, corrosion pits, bruises, foreign objects,underfill, pits, lack of meat, Defects such as scratches. The internal qualityinspection is to check the internal quality of the forging itself. It is aquality condition that cannot be found by the appearance quality inspection. Itincludes the inspection of the internal defects of the forgings and theinspection of the mechanical properties of the forgings. Parts or large metal forgings should also be subjected tochemical composition analysis.
Forging
Forinternal defects, we will use low-power inspection, fracture inspection, andhigh-power inspection to inspect the forgings for the presence of internalcracks, shrinkage holes, porosity, coarse crystals, white spots, dendrites, andstreamlines that do not conform to the shape, Defects such as streamlineturbulence, penetrating flow, coarse crystal ring, oxide film, delamination,overheating, overburning organization, etc. For the mechanical properties, itis mainly to check the normal temperature tensile strength, plasticity,toughness, hardness, fatigue strength, high temperature instantaneous rupturestrength, high temperature permanent strength, permanent plasticity and hightemperature creep strength.
After the forgings are produced into rigging,their stress conditions, importance, and working conditions are differentduring use, and the materials and metallurgicalforging used are also different. Therefore, different departments willclassify forgings according to the above conditions and the requirements of thedepartment. , Different departments and different standards have differentclassifications of forgings.
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