Technique for processing welded structure cement carbon quenching gear

A technology of carburizing, quenching and welding structures, which is applied in the coating process of metal materials, manufacturing tools, coatings, etc., which can solve problems such as weld cracking and deformation, achieve the elimination of welding stress, reduce energy consumption, and solve the deformation of welding parts Effect

Active Publication Date: 2009-04-15
CHONGQING GEARBOX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a process for carburizing and quenching gears with a welded structure, which can not only maintain the

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  • Technique for processing welded structure cement carbon quenching gear

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Embodiment 1

[0026] A process for carburizing and quenching gears with a welded structure. The modulus of the gears is 8 and the diameter is 1200mm. 20CrMnMo is selected as the ring gear material (the weight of the ring gear is about 1000Kg), 20MnMo is selected as the hub material, and 16Mn is selected as the spoke plate, Rib material, make the forging blanks of ring gear and wheel hub, and Line, blanking web, ribs, and then proceed as follows:

[0027] (1) Process the inner and outer circles and both ends of the ring gear, process the hub, web and ribs, and leave allowances on the inner hole and both ends of the hub;

[0028] (2) Hobbing the ring gear and leaving an appropriate finishing allowance;

[0029] (3) Carburizing and quenching of the ring gear, using the gas carburizing method, using isopropanol as a carburizing agent, the carburizing temperature is 930°C, carburizing for 25 hours, and the depth of the carburizing layer is 0.8-1.2mm. After the ring gear is released from the fu...

Embodiment 2

[0036] A process for carburizing and quenching gears with a welded structure. The modulus of the gears is 20 and the diameter is 2000mm. 17CrNiMo6 is selected as the ring gear material (the weight of the ring gear is about 2500Kg), 20MnMo is selected as the hub material, and Q235 is selected as the spoke plate. Rib material, make the forging blanks of ring gear and wheel hub, and Line, blanking web, ribs, and then proceed as follows:

[0037] (1) Process the inner and outer circles and both ends of the ring gear, process the hub, web and ribs, and leave allowances on the inner hole and both ends of the hub;

[0038] (2) Hobbing the ring gear and leaving an appropriate finishing allowance;

[0039] (3) Carburizing and quenching of the ring gear, using gas carburizing method, isopropanol as carburizing agent, carburizing temperature is 910°C, carburizing 80h, carburizing layer depth is 2.5-2.8mm, after the ring gear is out of the furnace Air cooling to 810°C for quenching, oil ...

Embodiment 3

[0045] The gears to be processed in this embodiment are the same as those in Embodiment 1, the materials and equipment used are the same, and the processing steps are basically the same. The depth of the layer is 0.8-1mm. After the ring gear is out of the furnace, it is air-cooled to 830°C for quenching, oil-cooled, and then tempered at a low temperature. The tempering temperature is 210°C and the holding time is 8h. The tooth surface hardness of the obtained ring gear is HRC62.

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Abstract

The invention discloses a process for processing a carburizing and quenching gear with a welding structure. The process is performed according to the following steps: the inner circle, the outer circle and the two end surfaces of a gear ring are processed, a hub and a radial plate are processed, and the margins are kept on the inner hole and the two end surfaces of the hub; the tooth form of the gear ring is coarsely processed, and the margins are kept; the gear ring is carburized, quenched, oil-cooled and low-temperature tempered; the radial plate and the hub are group-welded, and the gear ring and the radial plate are group-welded on a rotary work table of an automatic welding machine, the gear ring is pre-heated before welding, in the turning process when the gear ring is pre-heated and welded, the tooth part is cooled by cooling fluid through a cooling device, so that the temperature of the tooth part is below 200 DEG C; the ultrasonic crack detection of the welding seam is preformed; the stress is eliminated by the spectral harmonic vibration; and the precision machined step is performed. The process can ensure the hardness and the performance of the tooth surface of the gear as well as the quality of the welding seam after the gear ring is carburized and quenched, thereby solving the problem of the crack of the welding seam; moreover, by adopting the vibration stress eliminating process to eliminate the welding stress, the environment is protected, and the energy consumption is greatly lowered.

Description

technical field [0001] The invention relates to a technological scheme of a gear, in particular to a processing technology of a large-scale welded structure carburized and quenched gear. Background technique [0002] For large-scale gearboxes, while ensuring high-power transmission, in order to adapt to the use of some special occasions, the need for light weight must also be considered. At the same time, the teeth of the gears must be wear-resistant and impact-resistant, and better alloy materials must be used. , In order to save costs, large gears are generally not integral structures, and the ring gear, spokes, and hubs are often processed separately, and then welded, baked or connected into a whole with fasteners. Since the radial thickness dimension of the ring gear of the welded structure carburizing and quenching gear can be reduced accordingly, more expensive alloy materials are saved, and complicated procedures such as drilling and reaming in the combined gear are r...

Claims

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Application Information

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IPC IPC(8): B23P15/14C21D9/32C21D1/18C23C8/22
Inventor 曹殿爱杨有生阳靖陈光清
Owner CHONGQING GEARBOX
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