Unlock instant, AI-driven research and patent intelligence for your innovation.

Equal channels extrusion device

A technology of equal channel extrusion and channel, which is applied in the field of channel extrusion device and extrusion device, can solve the problems affecting the continuity of the test, the shape change of both ends, and the discomfort performance test, etc., to increase the effective use volume and elongation Improvement, the effect of microhardness improvement

Inactive Publication Date: 2009-03-18
SOUTH CHINA UNIV OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, experiments have found that this "L"-shaped channel has structural deficiencies, resulting in a large change in the shape of the two ends of the material after extrusion, most of which are pointed, as T.G.Langdon et al. in "Material Science and Engineering A" (Materials Science and Engineering A) 2006, 430(1-2): 151-156, entitled "The development of superplastic ductilities and uniformity of ZK60 magnesium alloy by equal channel extrusion" (The development of superplastic ductilities and microstructural homogeneity ina magnesium ZK60 alloy processed by ECAP) paper figure 1 displayed
After extrusion, the change of the shape of the end of the material will inevitably bring a series of disadvantages, mainly in: (1) The end of the extruded sample will appear sharp, and the sharp part is not suitable for subsequent performance tests, which is bound to It causes a waste of material; (2) In addition, the change of the shape of the sample is not easy to put the sample back into the channel for the next extrusion, which greatly affects the continuity of the test

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Equal channels extrusion device
  • Equal channels extrusion device
  • Equal channels extrusion device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 , figure 2 As shown, the present channel extrusion device includes: an upper die 1, a lower die 2, a vertical channel 3, a horizontal channel 4, bolts 5, and bolt holes 6. The upper mold 1 is provided with a T-shaped vertical channel 3 and a horizontal channel 4 that communicate with each other. The cross-sectional shape and area of ​​the vertical channel 3 and the horizontal channel 4 are the same; the lower mold 2 is a flat plate that matches the upper mold 1. Bolt holes 6 are provided at the corresponding positions of the mold 1 and the lower mold 2, and are fixedly connected by bolts 5.

[0023] according to figure 1 , figure 2 , image 3 Design and manufacture the extrusion device, select the cross-sectional shape of the vertical channel and the horizontal channel as a square, and the size is 22mm×22mm. The center line of the vertical passage 3 coincides with the vertical bisector of the horizontal passage 4, forming an axisymmetric passage....

Embodiment 2

[0027] The structure, design and manufacture of the extruding device are the same as in the first embodiment, and the cross-sectional shape of the vertical channel and the horizontal channel is selected as a circle with a diameter of 15 mm. The center line of the vertical passage 3 coincides with the vertical bisector of the horizontal passage 4, forming an axisymmetric passage.

[0028] The given metal material is a conventional cast AZ31 magnesium alloy, the average grain size of the microstructure is 32μm, the mechanical properties of the alloy at room temperature are: elongation 18%, tensile strength 207MPa, microhardness 54HV. The sample diameter is 15mm and the length is 50mm.

[0029] The alloy was subjected to equal-channel extrusion deformation at 300° C. for several times, and the specific operations were the same as in Example 1. After 4 passes of deformation, the grain size of the alloy is refined to 2.3 μm, such as Figure 5 As shown, the grain boundary angle in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
tensile strengthaaaaaaaaaa
microhardnessaaaaaaaaaa
Login to View More

Abstract

The invention relates to an equivalent channel extruding device which belongs to the materials processing engineering field. The invention is characterized in that: an upper die (1) is provided with a vertical channel (3) and a horizontal channel (4); both channels the cross sections of which are the same in shape and area take the shape of T and are communicated with each other, a lower die (2) is a flat plate suitable for use with the upper die; the relative positions of the upper die (1) and the lower die (2) are provided with bolt points (6) and fixedly connected with each other through bolts (5); the optimized structure of the channels is an axisymmetric channel with the center line of the vertical channel (3) coincided with the perpendicular bisector of the horizontal channel (4); the optimized shape of the cross sections is round or square. The invention has the advantages of simple structure, convenient operation, regular shape of specimen after processing, increase of effective usable volume of materials and reduction of the production cost. Moreover, the intensity, unit extension and microhardness hardness of the materials are improved significantly. The invention can be widely used in materials processing fields such as pure metal, alloy, composite material and high molecular material.

Description

technical field [0001] The invention belongs to the field of material processing engineering, and relates to an extrusion device, in particular to an equal-channel extrusion device for refining material grains to prepare ultra-fine crystal materials. Background technique [0002] Severe plastic deformation technology (SPD for short) is a new technology with strong grain refinement ability developed in the 1980s. This type of technology can directly refine the internal structure of the material to the submicron or even nanometer level by applying severe plastic deformation to the bulk material. The most promising approach for fine-grained materials. In recent years, large plastic deformation technology has been developed rapidly, mainly including equal channel angular extrusion (ECAP), high pressure torsion (HPT), reciprocating extrusion (CEC), cumulative rolling (ARB) and so on. Russian scientist R.Z.Valiev introduced equal channel angular extrusion in his book "Severe Pla...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02
Inventor 康志新简炜炜叶奇夏伟李元元
Owner SOUTH CHINA UNIV OF TECH