A rolling mill archway with a surface hardened layer

Abstract

The invention discloses a rolling mill housing with surface hardened layers. The rolling mill housing with the surface hardened layers comprises a housing body, wherein a window is formed in the housing body. A first working surface corresponding to a lower yoke contacting position of the housing and a second working surface corresponding to a sliding plate contacting position are arranged on a frame wall of the window, and the first working surface and the second working surface are both provided with surface hardened layers. A third working surface corresponding to a screw-down nut contacting position is further arranged on the frame wall of the window and a fourth working surface corresponding to an upper yoke contacting position of the housing and a fifth working surface corresponding to a working roller bending roller balance device contacting position are further arranged. The third, the fourth and the fifth working surface are provided with surface hardened layers. The rolling mill housing with the surface hardened layers protects the working surfaces of the housing and reduces the increasing of a gap of the rolling mill due to injury of the housing surface, the rolling mill is stable in working, impact is reduced, and probability of torsional vibration of a transmission system is reduced. In addition, the service life is prolonged, cost of online repair when a defect occurs is reduced, servicing time is reduced, servicing cost is reduced, and operation rate and economic benefit are improved.

Description

technical field [0001] The invention relates to metallurgical machinery and a rolling mill archway in the field of large-scale steel rolling equipment, in particular to a rolling mill archway with a surface hardened layer that is resistant to impact, wear and corrosion. Background technique [0002] At present, in large-scale strip rolling mill equipment, the rolling mill archway is generally made of low-carbon cast steel materials. Since the archway is a key part of the rolling mill, its safety factor is generally relatively large. Although the carbon equivalent of this kind of archway is relatively small, its archway The strength and rigidity can meet the needs of production; and the cost of low-carbon cast steel is relatively low, and the production is relatively easy; third, because the archway is a large steel casting, it is relatively easy to have casting defects, so the low-carbon cast steel The material is relatively easy to repair for defects. Therefore, low carbon...

AI Technical Summary

Problems solved by technology

These impact loads have a very adverse effect on the equipment and will cause certain damage to these working surfaces

Especially under hot rolling conditions, with the presence of a large amount of cooling liquid (such as roll cooling water) and high-pressure descaling water, the cooling liquid will be atomized when it comes into contact with the hot rolled piece, and the iron oxide scale or iron powder particles may be released along with the fog. Enter the gap of the archway skateboard 9, or be washed into the gap of the archway skateboard 9 by high-pressure water, and the load of the equipment will act on the archway skateboard 9, especially under the impact load, it will seriously damage the archway skateboard 9 and the work of the archway noodle

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