Reverse cone spiral roller ultra-fine grain rolling method of large-size aluminum alloy bar

An aluminum alloy, large-size technology, applied in the direction of metal rolling, metal rolling, rolls, etc., can solve the problems of large HPT forming load, aggravated deformation unevenness, poor mechanical properties, etc., to improve surface quality and uniform deformation The effect of reducing the degree of radial uneven deformation and reducing the probability of cracks
CN109772891AActive Publication Date: 2019-05-21安徽汉正轴承科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
安徽汉正轴承科技有限公司
Publication Date
2019-05-21

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Abstract

The invention relates to a reverse cone spiral roller ultra-fine grain rolling method of a large-size aluminum alloy bar, and relates to the field of mechanical processing. The method includes the following steps that a rolling tool is designed, wherein roll design and guide plate design are specifically included, and rollers are arranged to be double curved surface type circular-table-shaped spiral rollers; a deformation zone is constructed, wherein the curved surfaces of two guide plates are oppositely arranged, the two rollers are placed between the guide plates, and an area defined by thetwo guide plates and the two rollers is the deformation zone; an equal-ovality deformation zone is constructed, wherein the ovality in the deformation zone remains unchanged; and a rolling feeding mode is selected, wherein a reverse rolling mode is adopted. According to the reverse cone spiral roller ultra-fine grain rolling method of the large-size aluminum alloy bar, the double curved surface type circular-table-shaped spiral rollers and the curved surface guide plates are designed, the equal-ovality deformation zone is constructed, and acute plastic deformation is generated on the premise that the heart Mannesmann effect is significantly suppressed.
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Description

technical field

[0001] The invention relates to the field of mechanical processing, in particular to an ultra-fine-grain rolling method of a large-size aluminum alloy bar with a reverse-cone helical roll. 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...

Claims

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