Design method of concave roller of two-roller straightening machine of middle-diameter and large-diameter steel bar materials

Abstract

The invention discloses a design method of a concave roller of a two-roller straightening machine of middle-diameter and large-diameter steel bar materials. The design method comprises the following steps: reading values: reading a minimum diameter dmin and a maximum diameter dmax of a bar material to be straightened, the yield limit sigmat of the bar material to be straightened, an inclined angle minimum angle alphamin of the roller, an end part fillet corner R and a roller diameter Dg of the concave roller; designing a roller shape of a reversed three-section type two-roller straightening concave roller, setting a roller waist section curvature radius to be rho1, setting a roller belly section curvature radius to be rho2 and setting a roller chest section curvature radius to be rho3; substituting an elastic extreme curvature radius rhot of the bar material into an equation (2), an equation (3) and an equation (4) to obtain the roller waist section curvature radius rho1, the roller belly section curvature radius rho2 and the roller chest section curvature radius rho3. According to the design method of the concave roller of the two-roller straightening machine of the middle-diameter and large-diameter steel bar materials, the reversed three-section type two-roller straightening concave roller is designed so that a straightened workpiece reaches precision meeting the requirements and a straightening process is stable; machining is also very simple, and the problem that the value of the reverse curvature of the straightened roller is not proper so that the quality of a product is not up to standard is solved.

Description

technical field [0001] The invention relates to the fields of bar rolling and metallurgy, and relates to a method for designing concave rolls of a two-roll leveler for medium and large-diameter steel bars. Background technique [0002] At present, it involves the innovation of the straightening concave roll profile curve, especially the medium and large diameter steel bars based on the diameter of φ50-φ70. With the development and technological progress of the machinery industry and various sectors of the national economy, the requirements for the quality of steel products are getting higher and higher. In order to obtain relatively straight steel bars and eliminate bending, the steel bars need to be straightened on a straightening machine. [0003] Two-roller straightening has the characteristics of high precision and good quality, and realizes whole-process straightening. As a finishing technology, it always occupies an important place in the straightening field. [0004...

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Problems solved by technology

[0007] According to the above-mentioned technical problems, a design method for the concave roll of the two-roll straightening machine for medium and large-diameter steel bars is provided to solve the problem that the anti-bending rate of the existing two-roll straightening roll is based on empirical values , for bars with specific diameters, especially steel bars with medium and large diameters, there is a lack of inversion rate of specific straightening rolls, which makes it difficult to obtain straightness and ellipticity requirements for straightened bars, and the straightened bars The surface quality of the material is not up to standard, leading to the disadvantage of waste products

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