Forging process should be rationally designed

Forging Technology During the Ming and Qing Dynasties, the craftsmen from Longdong forged steamed buns, gongs, kitchen knives, stoves, copper-tin crafts, and gold and silver jewelry. During the Qing Yongzheng period (1723-173), the Yong-wing forging workmanship was made of local earth-iron and steel blade forging the "Yang-yang scissors" which became famous both inside and outside the province. In the 37th year of the Republic of China (1948), Fuding Tongshan opened a repair shop and used hand forging methods to forge and process agricultural implements. In the late 1950s, the forging process was gradually transformed into machine parts manufacturing. 1985, Fujian Furuta machinery plant create first jaw blacksmith hammer, hammer jaw and the introduction of 250kg, the spring hammer forging equipment, enhanced mechanical forging ability. In the 1980s, stamping technology was widely used. In the late 1980s, Jidong Motor Factory used duplex dies and used the "triple punching" process. The punches were fixed with a unloading pattern, and the stripper plate was fixed on the die to ensure accurate stamping strip position.

The function, structural characteristics and technical requirements of friction pair materials and their optional shaft parts Materials of shaft parts Blanks and materials of shaft parts Troubleshooting of common faults Requirements for use of transmission gears Standard structure and composition Development of accuracy standards for gears at home and abroad The current status of selection of quenching medium for gears Quenching cooling quality problems, 120HBMoS, CAE, 0.2%, rational design forging process At present, general companies do not have a sound process laboratory, lack of process testing conditions, and objectively require that the process scheme must be correct. A success. In particular, after entering the market economy, the person in charge of the company requested that the forging technicians can only successfully design the forging process successfully.

At present, general enterprises do not have a sound process laboratory, lack of process testing conditions, and objectively require that the process scheme must be correct and successful at one time. In particular, after entering the market economy, the person in charge of the company requested that the forging technicians can only succeed and must not fail. This brings great difficulties to the process designers and requires the technicians to have a higher level, but even with rich practices Experienced craftsmen will inevitably find it difficult to do so, causing great losses if they fail.

For a forging having an easily tearable portion at the time of trimming, the height of the brim portion of the flash bridging portion may be intentionally thinned during the design of the flash edge groove to reduce the thickness of the cut at the cut edge. Such as the S195 connecting rod, the material is 45 steel, after the cold cutting edge forging, the main part of the body due to the small cross-section shape, thin material, often in the trimming edge and adjacent ribs tear, high scrap rate. If the heat is changed to forging after cutting, the quality of trimming can be improved. However, the edge trimming is limited by the stroke rate of die forging and the efficiency is low. When the forging die is designed, the height of the flash bridging bridge is reduced here, and the punching force of the flash edge is reduced here, which can greatly reduce the trimming tear.

For the cold extrusion process, it is necessary to soften the blank and reduce the frictional force at the time of deformation, and strictly control the degree of deformation and the reasonable distribution of deformation in each process.

The softening annealing process of low-carbon steel, carbon steel and low-carbon alloy steel is as follows: heating to 760°C for 4h, cooling to 20°C/h, cooling to 680°C for 3h, cooling at a cooling rate of 20°C/h After 640°C, the furnace was cooled to 350°C. Hardness generally up to 125 ~ 155HB.

Carbon steel with less than 0.2% carbon content. The hardness of the steel after annealing can be less than 120HB. After the steel is softened and annealed, it is then lubricated by rolling, pickling, phosphating, saponification and then coated with lard to reduce the deformation load and effectively reduce the fracture failure of the punch, die ring and joint body.

The use of multiple processes and small deformation of the cold extrusion method can effectively reduce the unit extrusion pressure, the blank can be processed without softening, so that the mold life can be extended. Some manufacturers in the country are eager to change the extrusion process during the extrusion process. Although the sample (or product) can also be made, the mold load is too large and it is prone to fracture failure. This kind of quick success and instant benefit is one of the main technical reasons why China's cold extrusion process has been unable to develop rapidly.

Using forging die CAE software, you can analyze the flow of material, friction resistance and material filling cavity overflow situation, to help designers effectively and rationally process design.

The function, structural characteristics and technical requirements of friction pair materials and their optional shaft parts Materials of shaft parts Blanks and materials of shaft parts Troubleshooting of common faults Requirements for use of transmission gears Standard structure and composition Development of accuracy standards for gears at home and abroad And status Quo choice of quenching media for gears Quench cooling quality issues.