A rolling device with continuously variable elliptical cross section and billet making method

Abstract

The invention relates to a rolling device adopting roll groups with roll passes having continuous and variable elliptical cross sections and a billet making method utilizing the rolling device. The rolling device comprises a plurality of pairs of roll groups arranged at intervals, wherein each pair of roll group comprises an upper roll and a lower roll; opposite grooves are formed in each of the upper rolls and the corresponding lower roll separately and used for forming a roll pass for billet rolling; the roll groups comprise a guide roll group, a forming roll group, torsion roll groups and shaping roll groups which are coaxially arranged in sequence in the front-back direction; the roll passes of the guide roll group and the shaping roll groups are circular-shaped; the roll pass of the forming roll group is elliptical; the roll passes of the plurality of pairs of torsion roll groups are elliptical; a rotating angle is formed between the elliptical long axes of the roll passes of every two adjacent torsion roll groups from front to back; and the roll pass of the final pair of torsion roll group is parallel to the elliptical long axis of the roll pass of the forming roll group. According to the rolling device adopting the roll groups with the roll passes having continuous and variable elliptical cross sections and the billet making method utilizing the rolling device, the continuous processing of the billet of shaft parts is realized, the plastic deformation of the materials is realized, the equipment loading requirement is reduced, and the whole performance of the billet is improved.

Description

technical field [0001] The invention relates to the field of cold and hot processing of metal materials, in particular to a continuously variable elliptical section rolling device and a billet making method. Background technique [0002] Long-axis parts play a pivotal role in industrial production. For example, in the automotive industry, aerospace, machinery manufacturing and other industries, they undertake important functions in mechanical equipment, mainly used to transmit force and motion in machinery and support other parts. Therefore, its strength requirements are relatively high, but in metallurgy, casting, forging and other processing processes, there are often structural defects such as shrinkage cavities, porosity, inclusions, segregation, and coarse grains inside the material, and fracture cracks first nucleate from these positions and grow. Large, it is easy to cause the failure of shaft parts and affect the use of parts. Therefore, forging technology is used t...

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Problems solved by technology

For example, the patent with publication number CN201371172 proposes a variable-channel extrusion die. However, for the processing of shaft parts, this method has certain shortcomings. On the one hand, due to the large extrusion tonnage, this method is difficult to implement. On the other hand, its processing is continuous. Poor sex

In addition, the patent with the publication number CN201711480U discloses a process for improving the forgeability of shaft forgings by twisting the elliptical cross-section, but its continuous processability needs to be further improved

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