Large-diameter hollow roller and manufacturing method thereof

Abstract

The invention discloses a large-diameter hollow roller, which comprise a roller body, a left amplitude plate, a right amplitude plate and a shaft, wherein the left amplitude plate and the right amplitude plate are arranged at two ends inside the roller body respectively; the shaft passes through the left amplitude plate and the right amplitude plate; the big end of the shaft is on the right; the small end of the shaft is on the left; a middle amplitude plate is arranged between the left amplitude plate and the right amplitude plate; the middle amplitude plate is fixed on the inner wall of theroller body; the shaft passes through a through hole in the center of the middle amplitude plate; the inner diameter of the through hole of the middle amplitude plate is larger than the outer diameter of the shaft; at least three threaded holes are circumferentially distributed on the left amplitude plate and the right amplitude plate respectively; and fitting surfaces between the left and right amplitude plates and the roller body are provided with step surfaces respectively. The invention also discloses a method for manufacturing the large-diameter hollow roller. The roller has the advantages that the roller is better in air permeability in the welding process, ensures that dust, scrap iron and other sundries are not easy to enter the roller in use, is convenient to lift and good in balance, can guarantee assembly precision, and is not easy to deform in the machining and using processes.

Description

technical field [0001] The invention relates to a component in a machining production line, in particular to a large-diameter hollow roll. The invention also relates to a method for manufacturing the large-diameter hollow roll. Background technique [0002] Rolls are important components in cold rolling production lines. In rolling production, the rolls are in direct contact with the rolled metal, and the working speed is sometimes very high. The quality and life of the rolls are directly related to the productivity of the entire production line, product quality and production costs. The future steel rolling production will develop towards high speed, heavy load, high strength, high rigidity, high precision, continuous and automation, which will put forward higher requirements for the rolls. Therefore, it is extremely important to design high-quality and low-cost rollers. [0003] At present, the large-diameter hollow rolls (outer diameter greater than 800mm) used in cold...

AI Technical Summary

Problems solved by technology

[0005] 1. There is only one light hole on the left and right webs 2 and 4 as a vent hole, not only the air permeability is not good, but also dust, iron filings and other things are easy to enter the roller through this vent hole during the working process;

[0006] 2. There are no hoisting holes on the left and right panels 2 and 4, which is very inconvenient for hoisting;

[0007] 3. When welding the left and right webs 2, 4 and the roller body 3, the distance A between the inner side of the left (right) web and the outer side of the roller body is not easy to achieve, that is, the left and right webs 2, 4 are not easy to be on the roller body during the welding process. 3 up positioning;

[0008] 4. The assembly of shaft 1 is difficult: there is a transition or interference fit between the left panel 2 and shaft 1, and it is necessary to cool the shaft 1 (or heat the left panel 2) during assembly.

For large-diameter hollow rolls with an outer diameter greater than 800mm, the length of shaft 1 is relatively long, and it is time-consuming and laborious to penetrate. gets hot (or left web 2 is already cold), so exact alignment between left web 2 and shaft 1 cannot be guaranteed

[0009] 5. When the dimension L (the distance between the inner surface of the left panel and the inner surface of the right panel) is ≥1200mm, the wall thickness of the roller body 3 is very thin (when the outer diameter is ≥800mm, the thickness of the roller body 3 is 20~ 25mm steel plate bending forming), the overall rigidity and strength are not good, and it is easy to produce irreversible deformation when processing its outer surface

If the deformation is large, it will be scrapped, which will greatly increase the manufacturing cost; if the deformation is small, it is barely usable, but it will seriously affect the quality of the produced strip steel, and will also cause considerable losses

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