Tapered bushing for line and bar rolling mill

Abstract

The invention relates to mounting technology for roll collars of line and bar cantilever type rolling mills, in particular to a tapered bushing for the line and bar rolling mill, which can effectively improve the contact states among a roll shaft, a taper sleeve and the roll collar. The tapered bushing comprises a cylinder body provided with a taper sleeve inner conical surface, the outer surface of one end of the cylinder body is a taper sleeve outer contact face, the other end of the cylinder body is provided with a hanger for relieving pressure, and the cylinder body is provided with an inner toothed plate at the position of an inner hole of the hanger for relieving the pressure; one third part from one end of the cylinder body to the other end of the cylinder body and the taper sleeve outer contact face are provided with annular grooves, the sections of the annular grooves are arc-shaped, the depth of the arc is 0.5 to 0.8 millimeter, and the radius of the arc is 5 to 8 millimeters; and the outer surface of the cylinder body adjacent with the taper sleeve outer contact face is provided with a non-contact face. A heat-resistant martensitic stainless steel oCr17Ni4Cu4Nb is used as a raw material and subjected to special stamp forging and finish machining designs.

Description

Technical field [0001] The invention relates to the technical field of wire and bar steel rolling, in particular to a wire and bar rolling mill that can effectively improve the contact state between the roll shaft, taper sleeve, and roll ring when the roll ring of a cantilever rolling mill is installed and fixed Use tapered bushings. Background technique [0002] At present, the installation and fixation of the roll ring of the high-speed wire rod cantilever rolling mill basically uses the tapered bushing set matching method, which mainly realizes the keyless connection and bears the load through the friction of the joint surface, and the friction and contact properties of the joint surface It is extremely important for roll ring assembly. In the traditional assembly of roller shaft, cone sleeve and roller ring, the process of taper sleeve pressing is: the cone sleeve overcomes the friction force between the cone sleeve and the roller shaft, the friction force between the roller ...

AI Technical Summary

Problems solved by technology

[0008] In actual use, the front end 1 / 4 to 1 / 3 of the inner side of the taper sleeve is not in good contact with the roller shaft due to repeated pressurization and decompression. The roller shaft and the tapered sleeve made of alloy structural steel are corrosive, which accelerates its corrosion. The front end of the tapered sleeve and the corresponding part of the roller shaft will have permanent poor contact, and the effective transmission between the roller shaft, the tapered sleeve and the roller ring cannot be established. The static friction of the large load will cause the pressure drop of the tapered sleeve during rolling, and the relative sliding between the roller shaft, the tapered sleeve and the roller ring will cause serious damage to the roller shaft, and there will be a pile of steel accidents, or due to the small effective contact area, the cone The stress concentration on the inner wall of the sleeve causes the collapse of the roll ring and the cracking of the roll

Images