New bearing forging for shield machine and its forging method

Abstract

The present invention provides a new type of bearing forging for shield machine and its forging method. 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 is 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...

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