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Types and applications of precision forging

Release time：

2022-10-11

　　Forging forming technology, also known as near-shape or near-net forming technology refers to the forming technology that can be used as a mechanical component after the part is formed and requires only a small amount of processing or no more processing. In production practice, people are accustomed to forging forming technology into: cold finishing forging forming, hot finishing forging forming, warm finishing forging forming, composite forming, occlusion forging, isothermal forging, diversion forging, etc.

　　1、Cold forging forming

　　The metal material without heating is forged directly, mainly including cold extrusion and cold upsetting.

　　Cold forging forming technology is more suitable for multi-species small batch production, mainly used to manufacture a variety of automotive, motorcycle parts and some tooth-shaped parts.

　　2, hot forging forming

　　Mainly refers to the forging and forming process above the recrystallization temperature. Most of the hot finishing forging forming process using closed die forging, high requirements for die and equipment precision, forging billet volume strictly controlled, otherwise the die is easy to generate large internal pressure, so in the design of closed die forging die, usually use the principle of pressure reduction to solve this problem.

　　At present, most of the straight bevel gears used in China's heavy vehicles are produced by this method.

　　3、Warm forging forming

　　It is a forging and forming process at a suitable temperature below the recrystallization temperature. However, the forging temperature of warm forging is narrower, and the requirements for die material mechanics and die itself are high, usually need to use special high-precision forging equipment.

　　Warm forging process is generally more suitable for mass production, forging medium yield strength materials.

　　4、Composite forming

　　Mainly cold, warm, hot and other forging processes are combined to complement each other's strengths and achieve the desired results.

　　Composite forming is the standard forging method for various gears, pipe joints and other high-strength parts.

　　5、Closed forging

　　Is in the closed concave die through one or two punch one-way or two-way reactive extrusion of metal once formed, to obtain no flying edge of the fine forgings of the forming process.

　　Mainly used in the production of bevel gears, cars, such as speed universal joint star bushings, pipe joints, cross shafts, bevel gears and other products.

　　6、Isothermal forging

　　Refers to the billet in the tendency to constant temperature die forging.

　　Used for deformation temperature sensitive, difficult to form metal materials and parts, such as titanium alloys, aluminum alloys, thin webs, high tendons.

　　7、Diversion forging

　　It is to establish a material shunt cavity or shunt channel in the forming part of the blank or die to ensure the material filling effect.

　　Shunt forging is mainly applied to the cold forging and forming process of spur gears and helical gears.

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