Ultrafine grain rolling method of large-size 45 steel bar

An ultra-fine grain, large-scale technology, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of high HPT forming load, poor mechanical properties, lack of loading capacity, etc., to improve surface quality and Deformation uniformity, reduction of crack occurrence probability, enhanced effect of grain refinement

CN109807176AActive Publication Date: 2019-05-28安徽东耘智能设备制造有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-05-28

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Abstract

The invention discloses an ultrafine grain rolling method of a large-size 45 steel bar, and relates to the field of machining, particularly to the ultrafine grain rolling method of the large-size 45 steel bar. The ultrafine grain rolling method comprises the following steps of design of rolling tools, specifically comprising design of rollers and design of guide plates: setting the rollers as double-curved surface circular table rollers, specifically, forming generatrices of the rollers through connecting two curves, and setting one surfaces of the guide plates as curved surfaces; constructionof a deformation zone: oppositely placing the curved surfaces of the two guide plates, placing the two rollers between the guide plates, and setting a region refined by the two guide plates and the two rollers as the deformation zone; and selection of rolling feeding manner: selecting reverse feeding rolling manner, and constructing an even-ovality deformation zone. According to the ultrafine grain rolling method of the large-size 45 steel bar provided by the invention, the double-curved surface circular table rollers and the curved surface guide plates are designed, the even-ovality deformation zone is constructed, and severe plastic deformation under the precondition of the Mannesmann effect of a central part can be remarkably inhibited.
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Description

technical field

[0001] The invention relates to the field of mechanical processing, in particular to an ultrafine-grain rolling method for large-size 45 steel bars. Background technique

[0002] Ultrafine crystal / nanocrystalline materials and their preparation technology are one of the research hotspots in the field of material science. Research in this direction embodies people's efforts to continuously improve the strength and toughness of polycrystalline materials through continuous refinement of grains. Among them, the research results of severe plastic deformation (Severe Plastic Deformation, referred to as SPD) technology are eye-catching.

[0003] At present, the mainstream SPD process includes five methods: high pressure torsion (HPT), equal channel angular extrusion (ECAP), cumulative stack rolling (ARB), multidirectional forging (MF) and torsional extrusion (TE), among which:

[0004] (1) High-pressure torsional deformation: While loading a pressure of several GP...

Examples

Embodiment 1

[0071] Exemplary embodiments of the present invention will be described in detail below through specific examples. The following example takes the 45 steel bar with the specification of blank 3 as Φ82×400 as an example, however, the present invention is not limited thereto, and 45 steel bar with other specifications can also be produced by the method of the present invention.

[0072] 1) Rolling tool design, specifically including roll 1 design and guide plate 2 design, roll 1 is set as hyperboloid truncated conical roll 1, specifically: the generatrix of roll 1 is formed by connecting two curves, such as figure 1 As shown, one of the curves is any curve between the curve m and the curve p, the connecting line between the two ends of the curve is the first middle line n, and the other curve is any curve between the curve q and the curve t, The connecting line between the two ends of the curve is the second center line s; one side of the guide plate 2 is set as a curved surface...