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Novel bearing forge piece for shield tunneling machine and forging method of novel bearing forge piece

A shield machine and forging technology, applied in the field of bearing forgings for new shield machines and their forging

Active Publication Date: 2020-12-11
JIANGYIN FANGYUAN RINGLIKE FORGING & FLANGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large-sized bearing rings, the overall quenched and tempered hardness of the matrix needs to be 260HB~310HB, the average value of -20°C low-temperature toughness after quenched and tempered is Akv≥42J, the quenched hardness of the contact raceway surface is 59HRC~62HRC, and has a certain degree of quenching and tempering. Hard layer, currently there is no report on the steel used to meet the performance of large-size shield machine bearing rings

Method used

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Embodiment Construction

[0016] The present invention will be further described below in combination with specific embodiments.

[0017] The invention discloses a new type of bearing forging for a shield machine. The elements and contents of the forging are composed by weight percentage: C: 0.52 to 0.60, Si: 0.17 to 0.37, Mn: 0.50 to 0.80, Cr: 0.90 to 1.20, Mo: 0.15 to 0.30, Ni: 0.50 to 0.70, Cu: 0.05 to 0.1, W: 0.1 to 0.2; P: ≤0.015, S: ≤0.003, H: ≤0.00018; the rest are Fe and normal impurities.

[0018] For example, in CN201410802625.X, the steel for large-size shield machine bearing rings and its heat treatment method, wherein the C content is 0.41-0.45, the C content is increased in this application, and strong carbides can be formed, which can be precipitated during tempering MC produces a secondary hardening effect, which in turn improves impact resistance and has sufficient strength.

[0019] The W element is added, which helps the Mo element to exert its high hardenability, and the synergisti...

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Abstract

The invention provides a novel bearing forge piece for a shield tunneling machine and a forging method of the novel bearing forge piece. The forge piece comprises various elements including, by weightpercent, 0.52%-0.60% of C, 0.17%-0.37% of Si, 0.50%-0.80% of Mn, 0.90%-1.20% of Cr, 0.15%-0.30% of Mo, 0.50%-0.70% of Ni, 0.05%-0.1% of Cu, 0.1%-0.2% of W, not larger than 0.015 of P, not larger than0.003 of S, not larger than 0.00018 of H and the balance Fe and normal impurities.

Description

technical field [0001] The invention relates to a novel bearing forging for a shield machine and a forging method thereof. Background technique [0002] With the rapid development of urban construction, a large number of traffic tunnels, urban underground railways, water supply and drainage tunnels and cable tunnels have been built, under repair or are being planned. As the main construction machine for shield construction, the shield machine is currently showing a trend of large-diameter development. The Chongming Tunnel in Shanghai has begun to use a shield machine with a diameter of 15m. As the main component of the shield machine bearing, the bearing ring of the shield machine needs to reach a size of 6m or more. Therefore, on the basis of high fatigue strength, hardness, compressive strength, elastic limit, wear resistance and corrosion resistance, steel for large-size bearing rings also needs to have high hardenability, hardenability and certain impact toughness. Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44B21J5/00C22C33/04C21D9/40
CPCB21J5/002C21D9/40C22C33/04C22C38/02C22C38/04C22C38/42C22C38/44
Inventor 赵清赵元俊赵春良
Owner JIANGYIN FANGYUAN RINGLIKE FORGING & FLANGE
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