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The cooling mode after the machined products is formed

Edit: Jingjiang Jinlun Machine Manufacturing Co.,Ltd    Date: Jul 04, 2017

The cooling mode after the Machined Products is formed

The processing Machined Productss are formed by the external force of the forging equipment of the processing plant, to obtain the machining method with certain shape, size and mechanical properties. Then we need to cool down after processing the Machined Products, so today we will introduce some cooling methods for shanxi yongxin raw processing Machined Productss factory.

High carbon steel and high alloy steel material processing Machined Productss after forging forming, in order to prevent surface cracking, need after forging of cold before furnace, furnace cooling, cold or buried sand baking slow cooling, then heat treatment in a timely manner.

The stainless steel of the processed Machined Productss needs to be forged and immediately entered into the water. The aim is to keep the grain size as soon as possible and not to grow up. At the same time, do not want to have more internal organization or quality point precipitation, then solid solution processing.

All other conventional medium-low carbon steel and medium-low alloy steel processing Machined Productss must be air-cooled after forging. The aim is to make its cooling uniform, uniform and uniform, to prevent grain growth and mixing, easy to write identification. Black metal processed Machined Productss charging before heat treatment the surface temperature of not less than 50 ℃, prevent white spots.

Gear processed Machined Productss has a variety of materials, the gear processed Machined Productss commonly used material for: 40 cr, 42 crmo, 20 crmnmo, 20 crmnti, 42 crmo, 40 cr forging gear in the crane industry in the majority large size gear processing Machined Productss, 20 crmnmo, 20 crmnti forging gear used in mechanical transmission, small unowned (reference). The gears are most in need will improve gear quality, gear heat treatment hardness in 38 to 42 HRC can achieve the best performance, 42 crmo toughness is better than 40 cr, because the former hardenability better heat treatment, the contact and its material is very large. Also, the strength of the same hardness is very close. The tensile strength of the optimal performance of 40Cr is 60 ~ 75 kg/mm squared, and the yield strength is 35 ~ 55 kg/mm squared. The tensile strength of 42CrMo is 110kg/mm squared, and the yield strength is 95kg/mm. The performance of 42CrMo is obviously better than that of 40Cr.

The 40Cr material has good hardenability and can be hardened to 28 ~ 60mm in diameter when water quenching, and the oil can be quenched into the diameter of 15 ~ 40mm. After the adjustment, the material has good comprehensive mechanical properties, and has good low-notch sensitivity and low temperature impact toughness. The 40Cr gear processing Machined Productss are usually treated with high - frequency quenching or nitrification after the processing of the quality. When the hardness is 174 ~ 229HBS, the cutting processing performance is better, the relative cutting processing is 60%, and the carbon content of the processed Machined Products of 40Cr material is kept at about 0.40%, so as to ensure that the steel has good strength and toughness. The addition of Cr element is mainly to improve the hardenability of steel. When the quenching is heated, the Cr element is completely solid in the processed Machined Products body and improves the hardenability of the steel. After quenching, the Cr element solid solution strengthens the matrix and improves the tempering stability of the matrix. During high temperature tempering, some Cr elements are diffused from the matrix tissues to the precipitated carburized carburizing body (Cr, Fe) 3C.

The carbon content in the 42CrMo gear is kept at about 0.42%, which ensures that the steel has good strength and toughness. The addition of Cr and Mo elements is mainly to improve the hardenability of steel. When quenching and heating, the Cr and Mo elements are completely solids in the processing Machined Productss to improve the hardenability of steel. After quenching, Cr, Mo element solid solution strengthening matrix organization, and improve the return stability of the matrix. During high temperature tempering, some Cr and Mo elements are diffused from the matrix tissues to the precipitated carburized carburizing body (Cr, Mo, Fe) 3C. Addition of Mo element can eliminate temper brittleness. Adding a small amount of Ni elements can improve the toughness of the steel.


Jingjiang Jinlun Machine Manufacturing Co.,Ltd