The recrystallization temperature of steel is about 460 ℃, but 800 ℃ is generally used as the dividing line, and hot forging is higher than 800 ℃; The temperature between 300 ℃ and 800 ℃ is called warm forging or semi hot forging. Forging can be divided into cold forging and hot forging according to the temperature of the blank during processing.
In forging production, in addition to ensuring the required shape and size of forgings, it must also meet the performance requirements of forgings in the process of use, which mainly include: strength index, plasticity index, impact toughness, fatigue strength, initial fracture and stress corrosion resistance. For parts working at high temperature, there are also high-temperature instantaneous tensile properties, durability and thermal fatigue properties.
2. find out the quality problems, mainly to find out the causes, find out the defect parts and macro characteristics of forgings, and preliminarily judge whether the defects are caused by raw materials or forging process.
Piston rod is often used in almost all mechanical equipment, so we must pay attention to its installation. Otherwise, if the installation is incorrect, the equipment may not operate normally. In order to effectively improve the assembly quality of the equipment for better work.
What are the disadvantages of flame surface quenching of Dalian forgings?
The method of spraying the high-temperature flame generated by the mixing of combustible gas and oxygen onto the surface of the forging to quickly heat it to the quenching temperature, and then spraying a certain quenching medium on the heating surface for quenching and cooling is called flame surface quenching method.
The main inspection methods of Dalian forgings include chemical composition analysis, mechanical property test, low magnification inspection, metallographic high magnification inspection and nondestructive testing.
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