The technical requirements for forgings mainly include the following aspects:
Material and chemical composition: The material of the forging should be consistent with the material of the parts, the chemical composition should comply with national standards, and a material list should be provided. For aluminum alloy forgings, the size and material must comply with international safety standards.
Forging process: Parts of different shapes need to ensure a certain forging ratio, and round steel of similar size must not be used for forging. The temperature, frequency and pressure must be controlled during the forging process to ensure that the shape of the forging is neat and uniform, and to avoid problems such as skin overlap and fracture.
Heating temperature control: The control of heating, initial forging and final forging temperature of forgings is very important. The heating temperature of aluminum alloy forgings must be selected above the phase change temperature to ensure that the internal and external temperatures are consistent and the microstructure is completely transformed.
Deformation and equipment requirements: The deformation of steel should be carried out on equipment with sufficient energy to ensure forging penetration. Surface defects must be removed before forging the ingot or billet, and there must be sufficient removal at both ends of the ingot.
Heat treatment: Forgings should generally be delivered after the first heat treatment, and the heat treatment specifications are formulated by the manufacturer. When the bending and warping deformations produced after heat treatment exceed the tolerance range, they should be corrected by the manufacturer.
Mechanical properties: The mechanical properties of forgings should meet the requirements of relevant standards. The mechanical properties of commonly used steel forgings should meet the requirements of relevant standards. If there are special requirements for mechanical properties, they shall be determined by negotiation between the supply and demand parties.
Appearance quality: The appearance of forgings must be neat and uniform, and no problems such as overlapping and breaking should occur. If there are defects such as cracks, folds, forging scratches, interlayers, scars, slag inclusions, etc. on the surface, they must be handled in accordance with relevant regulations.
Test and inspection: The test classification of forgings is determined according to design requirements, working characteristics and uses. The test level of forgings should be indicated on the drawings and order contracts. If not indicated, they shall be handled as V-grade forgings.
