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Bearing heat treatment technology and equip ‘ One)

31st July 2013 Bearing Technology 0 Comments

First, technical development trend of heat treatment of bearing

The heat treatment direct relation subsequent processing quality of the bearing, so that influence usability and life-span of the part finally, the heat treatment of the bearing is energy consumption rich and influential family and heavy polluter in the bearing is made at the same time. The heat treatment equipment direct influence bearing heat treatment quality of the bearing, and energy consumption and polluting. In recent years, with the progress of science and technology, the technical development trend of the heat treatment mainly reflects in several following respects:

1Clean the intersection of heat treatment and heat treatment, produce formative waste water, waste gas, waste salt, waste oil and electromagnetic radiation,etc., can lead to the fact pollution to the environment. Solve the heat treated problem of environmental pollution, implement the clean heat treatment or green environment protective heat treatment It is one of the directions of the technical development of the heat treatment. This has all proposed the high requirement to heat treated atmosphere, quenching oil and washing equipment.

2The accurate heat treatment of the accurate heat treatment fully guarantees to optimize technological stability, it is very small may zero to realize the dispersity of product quality , the heat treatment distorts as zero, reduce the grinding allowance and raise production efficiency, save materials. Realize there must be good furnace temperature homogeneity, reliability of controlling the temperature in the accurate heat treatment, and good cooling effect and stability of quenching agent. Realize that can take two roads of quenching wholly and induction hardening in accurate heat treatment of the bearing.

3The energy-conserving heat treatment chooses the new energy utilization factor equipped in order to improve the heat treatment of heat insulating material; Optimize heat treatment process, raise the craft output, give full play to the ability of the apparatus. The test in doing of every bearing producer of the present stage, for example fully utilize waste heat, residual heat, some producer already use has forged the spheroidizing annealing that the residual heat carried on the part of the bearing; Adopt the low, cycle of consuming energy short craft long in place of cycle, great craft,etc. of consuming energy; Make bainite, quench craft, to a certain extent, in the a certain limit, it quenches crafts to be long with shorter bainite consuming energy loud cementation crafting in place of cycle.

4Oxidizing the heat treatment little adopts the controlled atmosphere to heat the controllable atmosphere heated to carbon tendency, nitrogen tendency of accuracy control in place of the oxidation ambient to heat, heat treatment later characteristic of part is improving,heat treatment defect such as oxidizing, decarbonizating and crackle,etc. reduce greatly, the hot and treated precise finishing allowance is reduced, has raised utilization factor and machine process efficiency of the material. The vacuum heats air quenching, vacuum or undervoltage cementation, nitridating, nitrogen carbon and oozes and oozes boron etc. and can improve the work piece quality obviously together, reduce distortion, raise the life-span.

Second, bearing heat treatment are equipped

1.Ann. apparatus

The ann. apparatus of China is that the oxidation furnace and controlled atmosphere stove coexist at the present stage, the oxidation furnace exceeds the controlled atmosphere stove; The cycle stove is and serial stoves coexist, and the cycle stove exceeds the serial stove. U.S.A., Britain, Japan country popularize as far back as will it be six the seventies the 20th century in an all-round way, push rod type and type,etc. of roller bottom the intersection of Qiu and annealing furnace Wen already, shorten the cycle of annealing, power saving, and improve the quality of annealing. With the development of bearing part process technology, precision forging and accurate to pass through many hands or places, expand cold to pass through many hands or places Technological adoption, the machining accuracy of the part blank is higher and higher, therefore has brought to the annealed demand of controlled atmosphere. The bearing trade should popularize the spheroidizing annealing of the controlled atmosphere rapidly, decarbonizate in order to reduce oxidation after annealing, raise and process efficiency, the energy-conservation of material-saving, lower costs.

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