Device and method for preparing super-fine crystal bar combining positive extrusion and rotary side extrusion
An ultra-fine grain and bar technology, applied in the field of metal plastic processing, can solve the problems of reducing shear deformation effect, low center equivalent strain, and high surface equivalent strain, and achieves reduction of microstructure and performance inhomogeneity, deformation mode A variety of effects with a large degree of deformation
Inactive Publication Date: 2019-02-22
JIANGSU UNIV OF SCI & TECH
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However, the disadvantage of this technology is that the torsion of the workpiece mainly depends on the friction between the workpiece and the extrusion cylinder. For the axisymmetric extrusion cylinder, it is easy to cause relative sliding between the workpiece and the extrusion cylinder, thereby reducing the effect of shear deformation. The characteristics of shear deformation, after deformation, the equivalent strain of the surface is high, and the equivalent strain of the center is low, resulting in uneven material properties
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[0025] Example: such as Figure 1 to Figure 3 Shown: a device for producing ultra-fine-grained rods by combining forward extrusion with rotary side extrusion, including extrusion punch (1), upper extrusion barrel (3), bearing (4), lower extrusion barrel (5), The upper extrusion cylinder supports (6), worm (7), bearing (8) and support seat (9). There is a positive extrusion channel in the center of the upper extrusion cylinder (3), and the upper end of the channel (3-1) is a straight wall Cylindrical, (3-2) is the positive extrusion zone, the lower end of the extrusion channel is a circular groove (3-3), and the upper extrusion cylinder (3) is fixed on the support (6) of the upper extrusion cylinder; The bar material (2) is cylindrical and placed in the extrusion channel (3-1) of the upper extrusion barrel (3); the extrusion punch (1) is placed in the extrusion channel (3-1) of the upper extrusion barrel (3). -1), placed on the upper end of the bar (2); the upper end of the lo...
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The invention relates to the technical field of metal plastic machining, in particular to a device and a method for preparing a super-fine crystal bar combining positive extrusion and rotary side extrusion. The device comprises an extrusion protruding die, an upper extrusion container, a bearing, a lower extrusion container, an upper extrusion container support, a worm, a bearing and a supportingbase. The upper extrusion container positive extrusion deformation area is of a non-axisymmetric structure and is transited to a oval from a circle then is transited to the circle; and the lower extrusion container adopts a lateral extrusion channel, the upper end and the lower end of the lower extrusion container are supported by the bearings, and the lower extrusion container is driven to rotatethrough the worm. The method for preparing the super-fine crystal bar by using the device comprises the following steps that extruding is carried out firstly till the front end of the bar enters thelateral extrusion channel, the lower extrusion container is rotated while the axial extrusion is carried out, and thus the bar continuously generates shear deformation. The device drives the bar to rotate through the die structure and the friction jointly, the deformation efficiency is high; and the large-plastic deformation in the material can be obtained through single pass, the material organization is refined, the applicable material range is wide, and the industrial application of the high-pressure twisting process is promoted.
Description
technical field [0001] The invention relates to the technical field of metal plastic processing, in particular to a device and method for preparing ultra-fine-grained rods by combining forward extrusion with rotary side extrusion. Background technique [0002] Severe plastic deformation is the most effective way to prepare bulk ultrafine-grained materials through the top-down method. The severe plastic deformation technologies developed in recent years include high-pressure torsion (HPT), equal-diameter angular extrusion (ECAP), reciprocating extrusion ( CEC), etc. In the conventional high-pressure torsion technology, the sheet-like workpiece is placed in the cavity of the mold, and the indenter applies high pressure to the workpiece while the mold or indenter rotates. The high-pressure torsion technology can refine coarse-grained materials to the nanometer level, but its limitations are It is mainly used for workpieces with small dimensions, and its application is limited....
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Login to View More IPC IPC(8): B21C23/08B21C25/02
Inventor 石凤健张健伟王超王浩张诚叶思珍刘莹雪
Owner JIANGSU UNIV OF SCI & TECH