Forging a metal pressure is applied, by plastic deformation of a desired shape or mold the compression force suitable object. Typical of this power through the use of a hammer or pressure to achieve. Casting process of the construction of fine grain structure and improve the physical properties of the metal. In parts of the real use, a proper design enables particle flow in the direction of the main stress.
Forging the presence of defects, and some will affect the quality of subsequent treatment processes or processing quality, and some seriously affect the performance and the use of forged or even greatly reduce the life of the finished pieces, endangering safety. Therefore, in order to ensure or improve the quality of forgings, except in the process to strengthen quality control, take appropriate measures to put an end to the production of
forging defects, we must also make the necessary quality testing, to prevent the follow-up process with and the use of performance deficiencies bad influence subsequent step forging flow. The quality inspection, but also according to the nature and effect of defects on the extent of use of remedial measures have been produced forgings, to conform to the technical standards or requirements.
Therefore, forging quality inspection in a sense, on the one hand have been made to ensure the quality of forgings, the other is to improve the direction that the forging process to ensure compliance forging quality standards, and to meet the design, processing and use requirements.
Forging quality inspection, including the appearance of quality and internal quality inspection. Appearance quality forgings mainly refers to the geometric size, shape, surface condition and other items of inspection; internal quality inspection is mainly refers to the forging chemical composition, macro-organization, microstructure and mechanical properties of each test.
Specifically, the appearance quality inspection forging is to check the shape of the forging, the geometric dimensions meet the requirements of design, the surface of the forging is defective, what is the nature of the defect, what their morphological characteristics. Surface state inspection is to check the contents of the general forging surfaces for surface cracks, folds, creases, indentations, orange peel, blister, the scars, pits, bumps, foreign matter, not filled, pits, lack of meat, designated marks and other defects. For internal defects we will check through the low times, fracture inspection, high-powered way to check to verify the existence of such internal
crack forgings, shrinkage, loose, coarse-grained, white point, dendrite, flow lines do not meet the shape, flow lines disorder, cross-flow, coarse crystal ring, the oxide film, delamination, overheating, burning tissue defects. As for the mechanical properties mainly to check the temperature tensile strength, ductility, toughness, hardness, fatigue strength, high instantaneous breaking strength, high temperature creep rupture strength, ductility and high temperature creep lasting strength.
