Hot rolled reinforcing steel bar having ribs and deflecting roller

Abstract

A method for straightening the hot-rolled ribbed reinforcing steel bar by-two guide rollers features that said guide roller has a diameter which is at least 4 times greater than that of the ribbed inforcing bar to be straightened and the shape of its working part, which is similar to that of rib. The guide roller is composed of splitted roller body with an adjustable gap and the roller holder.

Description

technical field [0001] The invention relates to a wire straightening method and device, in particular to a hot-rolled ribbed steel straightening method and a guide roller. Background technique [0002] Since the Ministry of Construction and the Ministry of Metallurgy jointly issued a document in 1995 to promote the application of hot-rolled ribbed steel bars (especially 400Mpa new grade III steel bars), the longitudinal ribs of hot-rolled ribbed steel bars are distorted after uncoiling and straightening, and the longitudinal and transverse ribs The problem of severe damage has become a big problem in the construction industry and metallurgy industry. Although this problem has been worked hard by many manufacturers for several years, it has not been solved. [0003] Hot-rolled ribbed steel bar is a wire rod with both the transverse ribs of ordinary steel bars and two convex symmetrical longitudinal ribs, which are extruded by rolls rotating along the axial direction of the st...

AI Technical Summary

Problems solved by technology

As long as a section of the longitudinal rib is cut off, the steel bar will not be able to use its own longitudinal rib to advance in the guide roller and the rollers in the subsequent working step according to the set straight track, but will be in the direction of the guide roller and the rollers in the subsequent working step. Turning while advancing, the longitudinal rib of the steel bar is twisted, and the longitudinal and transverse ribs are seriously damaged;

[0005] 2. Since the guide roller only exerts a clamping force on the base circle of the longitudinal rib root of the steel bar, the surface of the steel bar is easily damaged when the clamping force is large, and the steel bar cannot be clamped when the clamping force is small, and the steel bar with torsional stress will still be damaged. In the guide roller and the rollers in the subsequent steps, it rotates while advancing, and it is impossible to apply reverse torque to the steel bar through the guide roller to eliminate the torsion;

[0006] 3. Since the guide roller is an integral structure, the shape and size of the working part of one specification of the guide roller is only suitable for one specification of steel bars. When straightening steel bars of various specifications, it is necessary to prepare multiple pairs of guide rollers with different shapes and sizes of the working parts; And after local damage occurs in the working part of the guide roller, the whole guide roller must be replaced, thereby affecting the production quality, reducing the production efficiency and increasing the production cost

Images