CN108405647A - A kind of circular bar is crowded to turn round shaping dies and its crowded torsion method - Google Patents
A kind of circular bar is crowded to turn round shaping dies and its crowded torsion method Download PDFInfo
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- CN108405647A CN108405647A CN201810210369.3A CN201810210369A CN108405647A CN 108405647 A CN108405647 A CN 108405647A CN 201810210369 A CN201810210369 A CN 201810210369A CN 108405647 A CN108405647 A CN 108405647A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007493 shaping process Methods 0.000 title claims abstract description 24
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 230000008676 import Effects 0.000 claims abstract description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 19
- 230000007704 transition Effects 0.000 claims description 19
- 238000001125 extrusion Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 102000003691 T-Type Calcium Channels Human genes 0.000 claims description 2
- 108090000030 T-Type Calcium Channels Proteins 0.000 claims description 2
- 239000004033 plastic Substances 0.000 abstract description 8
- 229920003023 plastic Polymers 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 7
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 3
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- 239000013078 crystal Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 108091006146 Channels Proteins 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 229910002804 graphite Inorganic materials 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/001—Extruding metal; Impact extrusion to improve the material properties, e.g. lateral extrusion
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Abstract
The present invention relates to the crowded torsion technical field of mold of bar, specially a kind of circular bar squeezes shaping dies and its crowded torsion method turned round, including punch and crowded torsion cavity plate；The punch is arranged above the crowded torsion cavity plate, and the punch is coaxially disposed with the crowded torsion cavity plate；The crowded torsion cavity plate includes pressing plate, die sleeve, positioning sleeve, squeezes twisting die, positioning pin and bottom squeeze mould；It is machined with mold cavity inside the crowded torsion cavity plate, positioning sleeve is set gradually inside the mold cavity from top to bottom, squeezes twisting die and bottom squeeze mould, the die sleeve upper end is fixedly connected by screw group one with the pressing plate, the die sleeve lower end is fixedly connected by screw group two with the pedestal, the die sleeve upper end is machined with bar import, and the die sleeve lower end is machined with two groups of bar outlets；The present invention squeezes the by of being twisted into shape by a time by circular bar and a series of continuous compound plastics occur deforms, and there is good in refining effect, deformation efficiency height, combined type cavity easy processing, mold attaching/detaching to replace and the advantages such as facilitate.
Description
Technical field
Torsion manufacture field is squeezed the present invention relates to bar more particularly to a kind of circular bar squeezes and turns round shaping dies and its crowded torsion side
Method.
Background technology
Super fine crystal material makes its physical property and mechanical property significantly be carried because of its unique microcosmic microscopic structure
Height, therefore the technology of preparing of super fine crystal material becomes one of the hot spot in current investigation of materials field.Become compared to traditional plasticity
The extruding of shape method, rolling etc., severe Plastic Deformation Methods can be under lower deformation temperature, high hydrostatic pressure state, will be thick
Big grain structure is refined to sub-micron even Nano grade, obtains a series of super fine crystal material with excellent properties.Currently,
Severe Plastic Deformation Methods include mainly：Equal channel pressings, accumulation ply rolling, crowded torsion, reciprocating extrusion, multiway forging, high pressure torsion etc..
Twisting strain is squeezed as a kind of novel large plastometric set technique, by Ukraine scientist Yan Beygelzime and its
The crystal grain refinement that team proposed in 1999, and was applied to material for the first time in 2004 at first.Its deformation principle is：Rectangle
The non-circular sample in section is finally squeezed out after one section of mold with rectangular section helical duct.It squeezes during twisting strain,
Mode of texturing includes two kinds of pure shear shear deformation and simple shear deformation；After squeezing twisting strain, the cross-sectional shape and shape ruler of sample
It is very little to remain constant, therefore the reciprocal of multi-pass can be carried out and squeeze twisting strain further to accumulate plastic strain, improve material
Microscopic structure, to improve its mechanical property.
However, after squeezing twisting strain, the cross-section of sample often shows strong anisotropy, and in sample cross
Center portion point and the structural homogenity of marginal portion differ greatly.Generally use multi-pass back and forth squeezes and twists into step refining crystal grain, changes
Kind structural homogenity and mechanical property, but still the problems such as that there are processing efficiencies is low, high processing costs.
In recent years, squeeze twisting strain technique foreign countries carried out more comprehensive system research, and obtained considerable research at
Fruit.However, due to the limitation of many-sided condition, the domestic correlative study about crowded twisting strain technique is also rarely reported, and not yet
Cause enough concerns.For the current present Research of crowded twisting strain technique and existing main problem, the present invention provides one
Kind circular bar, which squeezes, turns round shaping dies and its crowded torsion method, can realize that a time of circular bar is squeezed and be twisted into shape, and then pass through
A series of continuous compound plastic deformations occur, to constantly accumulate larger plastic strain, to reach uniform thinning microstructure simultaneously
Improving improves the purpose of material property, has good in refining effect, deformation efficiency height, combined type cavity easy processing, mold attaching/detaching more
It changes and the advantages such as facilitates.
Invention content
The present invention overcomes above-mentioned the deficiencies in the prior art, provide a kind of crowded torsion shaping dies of circular bar and its crowded torsion
Method.The present invention occurs a series of continuous compound plastics by circular bar is twisted into shape by a time is crowded and deforms, and has thin
Change the advantages such as effect is good, deformation efficiency is high, the replacement of combined type cavity easy processing, mold attaching/detaching facilitates.
Technical scheme of the present invention：
A kind of circular bar is crowded to turn round shaping dies, including punch and crowded torsion cavity plate；The punch setting is recessed in the crowded torsion
Above mould, and the punch is coaxially disposed with the crowded torsion cavity plate；
The crowded torsion cavity plate includes pressing plate, die sleeve, positioning sleeve, squeezes twisting die, positioning pin and bottom squeeze mould；In the die sleeve
Portion's assembling is fixed with mold cavity, sets gradually positioning sleeve inside the mold cavity from top to bottom, squeezes twisting die and bottom squeeze
Mould, the die sleeve upper end are fixedly connected by screw group one with the pressing plate, the die sleeve lower end by screw group two with it is described
Pedestal is fixedly connected, and the die sleeve upper end is machined with bar import, and the die sleeve lower end is machined with two groups of bar outlets；
Positioning mantle cavity is machined with inside the positioning sleeve；It is machined with top successively from top to bottom inside the bottom squeeze mould
Changeover portion and lower part T-type extruded segment, deformed sections are real eventually by the T-type channel of bottom by rectangle gradual transition to circle
The extrusion molding of existing material；It is machined with changeover portion inside the crowded twisting die successively from top to bottom and lower part is squeezed and turns round section, deformation is cut
The crowded torsion of rectangular section is occurred again by round gradual transition to rectangle for face；The changeover portion is connected to the positioning mantle cavity, described
Lower part is squeezed torsion section and is connected to the top changeover portion of the bottom squeeze mould.
Further, the positioning sleeve, crowded twisting die and bottom squeeze mould are two semicolumns compositions.
Further, the lower face of the crowded twisting die is machined with semicircle dowel hole one, bottom squeeze mould upper end
Face is also machined with semicircle dowel hole two corresponding with the semicircle dowel hole one, the semicircle dowel hole one with
It is provided with positioning pin between the semicircle dowel hole two, the positioning pin is by the crowded twisting die and bottom squeeze mould position
Set fixation.
Further, the mold materials are 5CrNiMo steel.
Further, the crowded inner rectangular section for turning round section in the lower part of the crowded twisting die remains unchanged, and squeezes torsion angle γ and is
90 °, it is 40mm to squeeze and turn round passage length.
A kind of circular bar squeezes the working method of torsion shaping dies, and this method comprises the following steps：
Step a：The not closed rectangular resistance furnace in top and bottom is placed on hydraulic press workbench, by crowded torsion shaping dies,
Circular bar is placed in resistance furnace, and heating keeps the temperature 30 minutes after reaching specified for temperature ranges；
Step b：After heat preservation, circular bar is put into mold cavity, positioning sleeve bottom is depressed into punch
End position keeps the temperature 10 minutes；
Step c：Start hydraulic press, push punch, deformation process is specially：Circular bar is gradual in the changeover portion for squeezing twisting die
Extruding transition is rectangular section, then is squeezed in lower part and turn round the crowded twisting strain for completing rectangular section in section；Into the upper of bottom squeeze mould
It is circle that transition is gradually squeezed after portion's changeover portion, finally enters the T-type extruded segment of lower part, and extrusion molding is exported from both ends.
Further, the mould heating-up temperature range in the step a is at 250 DEG C~400 DEG C.
Further, circular bar is squeezed and is twisted into during shape, using water-based graphite as lubricant.
Further, the circular bar is light alloy metal material.
The present invention has the advantages that compared with the existing technology：
One, the present invention can realize that a time of metal material is squeezed and be twisted into shape, compared to traditional crowded torsion technique, not need
The crowded torsion processing of multi-pass repeatedly is carried out, there is refinement high uniformity, deformation efficiency height, deformation process continuous-stable, save material
The advantages that material.
Two, the present invention can realize the crowded twisting strain of circular cross-section material, and overcoming existing crowded torsion technology may only process
The limitation of rectangular section material.
Three, the present invention constitutes circular bar using combined type cavity and squeezes torsion shaping dies, has easy processing, replacement easy to assemble
The advantages that.Mold, circular bar are directly heated using the not closed rectangular resistance furnace in top and bottom, directly squeezed after heat preservation
Compacting is tested, and the movement to mold in experimentation can be reduced, and can reduce the temperature loss in experimentation, is reduced experiment and is missed
Difference.
Description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention.
Fig. 2 is the half section structure diagram of specific embodiment 1,2.
Fig. 3 is the combined type cavity dimensional structure diagram of Fig. 2.
The combined type cavity that Fig. 4 is Fig. 2 divides sectional position figure.
Fig. 5 is the cross sectional shape change schematic diagram of the combined type cavity of Fig. 2.
Fig. 6 is the half section structure diagram of specific embodiment 3.
Fig. 7 is the combined type cavity dimensional structure diagram of Fig. 6.
The combined type cavity that Fig. 8 is Fig. 6 divides sectional position figure.
Fig. 9 is the cross sectional shape change schematic diagram of the combined type cavity of Fig. 6.
Figure 10 is to carry out deformed equivalent strain isogram to aluminium alloy 6061 using the mold of specific embodiment 1.
1- punches in figure；2- pressing plates；3- screws group one；4- die sleeves；5- circular bars；6- positioning sleeves；7- squeezes twisting die；8- is fixed
Position pin；9- bottom squeeze moulds；10- screws group two；11- pedestals.
Specific implementation mode
Below with reference to attached drawing, the present invention is described in detail.
Embodiment one：
Show in conjunction with Fig. 1-Fig. 3, a kind of circular bar disclosed in the present embodiment is crowded to turn round shaping dies, including punch 1 and crowded torsion
Cavity plate；The punch 1 is arranged above the crowded torsion cavity plate, and the punch 1 is coaxially disposed with the crowded torsion cavity plate；
The crowded torsion cavity plate includes pressing plate 2, die sleeve 4, positioning sleeve 6, squeezes twisting die 7, positioning pin 8 and bottom squeeze mould 9；It is described
4 assembled inside of die sleeve is fixed with mold cavity, sets gradually positioning sleeve 6 inside the mold cavity from top to bottom, squeezes 7 and of twisting die
Bottom squeeze mould 9,4 upper end of the die sleeve are fixedly connected by screw group 1 with the pressing plate 2, and 4 lower end of the die sleeve passes through spiral shell
Nail group 2 10 is fixedly connected with the pedestal 11, and 4 upper end of the die sleeve is machined with bar import, and 4 lower end of the die sleeve is machined with
Two groups of bar outlets；
Positioning mantle cavity is machined with inside the positioning sleeve 6；It is machined with successively from top to bottom inside the bottom squeeze mould 9
Portion changeover portion 9-1 and lower part T-type extruded segment 9-2, deformed sections by rectangle gradual transition to circle, eventually by the T of bottom
Realize the extrusion molding of material in type channel；It is machined with changeover portion 7-1 inside the crowded twisting die 7 successively from top to bottom and lower part is squeezed and turned round
Section 7-2；The crowded torsion of rectangular section is occurred again by round gradual transition to rectangle for its deformed sections；The changeover portion 7-1 with it is described
Mantle cavity connection is positioned, the lower part is squeezed torsion section 7-2 and is connected to the top changeover portion 9-1.
Further, the positioning sleeve 6, crowded twisting die 7 and bottom squeeze mould 9 are two semicolumns compositions.
Further, the lower face of the crowded twisting die 7 is machined with semicircle dowel hole one, on the bottom squeeze mould 9
End face is also machined with semicircle dowel hole two corresponding with the semicircle dowel hole one, the semicircle dowel hole one
It is provided with positioning pin 8 between the semicircle dowel hole two, the positioning pin is by the crowded twisting die 7 and the bottom squeeze
9 position of mould is fixed.
Further, the mold materials are 5CrNiMo steel.
Further, the crowded inner rectangular section for turning round section 7-2 in the lower part of the crowded twisting die 7 remains unchanged, and squeezes torsion angle
γ is 90 °, and it is 40mm to squeeze and turn round passage length.
A kind of circular bar squeezes the working method of torsion shaping dies, and this method comprises the following steps：
Step a：The not closed rectangular resistance furnace in top and bottom is placed on hydraulic press workbench, by crowded torsion shaping dies,
Circular bar 5 is placed in resistance furnace, and heating keeps the temperature 30 minutes after reaching specified for temperature ranges；
Step b：After heat preservation, circular bar 5 is put into mold cavity, positioning sleeve 6 is depressed into punch 1
Bottom position keeps the temperature 10 minutes；
Step c：Start hydraulic press, push punch 1, deformation process is specially：Circular bar 5 is in the changeover portion for squeezing twisting die 7
It is rectangular section that 7-1, which gradually squeezes transition, then is squeezed in lower part and turn round the crowded twisting strain for completing rectangular section in section 7-2；Into bottom
It is circle that transition is gradually squeezed after the top changeover portion 9-1 of extrusion die 9, the T-type extruded segment 9-2 of lower part is finally entered, from both ends
Export extrusion molding.
Further, the mould heating-up temperature range in the step a is at 250 DEG C~400 DEG C.
Embodiment two：
The present embodiment is further illustrated in conjunction with Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Figure 10.T-type extruded segment 9-2 is most in the present embodiment
Circular cross-section bar is squeezed out eventually.
The circular bar of 50 × 65mm of dimensions φ is put into the crowded torsion shaping dies of embodiment 1 and is deformed.It should
The stereochemical structure of combined type cavity is as shown in Figure 3；It is split at different locations, specific split position is as shown in figure 4, be convenient for
Observe the changing section of different parts in deformation process.In conjunction with the cross sectional shape change schematic diagram of Fig. 5, it can be seen that：Directly
In the changeover portion 7-1 for squeezing 7 top of twisting die crimp occurs for initial circular section, that is, faces A-A that diameter is φ 50mm, reaches transition
When the section bottom ends 7-1, it is 30 × 30mm rectangles that bar section, which gradually squeezes transition, as shown in the faces D-D；It is squeezed again in lower part and turns round section 7-
The crowded twisting strain of completion, the rectangular sections that difference is squeezed at torsion angles do not change in 2, when reaching the crowded torsion section bottom ends 7-2, complete
The crowded twisting strain of 90 ° of rotations, rectangular section is as shown in the faces G-G；It is sent out after the top changeover portion 9-1 for entering bottom squeeze mould 9
Raw crimp, it is φ 12mm round so that bar section is gradually squeezed transition by 30 × 30mm rectangles, as shown in the faces J-J；Finally
Into the T-type extruded segment 9-2 of lower part, is exported from both ends and squeeze out φ 12mm circular cross-section bars, as shown in the faces L-L
Under 400 DEG C of deformation temperatures, 6061 circular bar of aluminium alloy of 50 × 65mm of dimensions φ is subjected to above-mentioned squeeze
Twisting strain.After deformation, the equivalent strain isogram of 6061 bar of aluminium alloy is as shown in Figure 10.A point P on bar is chosen,
Variation tendency of the equivalent strain of point during whole deformation is as illustrated on the graph
Embodiment three：
The present embodiment is further illustrated in conjunction with Fig. 6, Fig. 7, Fig. 8 and Fig. 9.T-type extruded segment 9-2 is finally squeezed out in the present embodiment
Rectangular section plank.
The circular bar of 50 × 65mm of dimensions φ is put into the crowded torsion shaping dies of embodiment 2 and is deformed.It should
The stereochemical structure of combined type cavity is as shown in Figure 7；It is split at different locations, specific split position is as shown in figure 8, be convenient for
Observe the changing section of different parts in deformation process.In conjunction with the cross sectional shape change schematic diagram of Fig. 9, it can be seen that：Directly
In the changeover portion 7-1 for squeezing 7 top of twisting die crimp occurs for initial circular section, that is, faces A-A that diameter is φ 50mm, reaches transition
When the section bottom ends 7-1, it is 30 × 30mm rectangles that bar section, which gradually squeezes transition, as shown in the faces D-D；It is squeezed again in lower part and turns round section 7-
The crowded twisting strain of completion, the rectangular sections that difference is squeezed at torsion angles do not change in 2, when reaching the crowded torsion section bottom ends 7-2, complete
The crowded twisting strain of 90 ° of rotations, rectangular section is as shown in the faces G-G；It is sent out after the top changeover portion 9-1 for entering bottom squeeze mould 9
Raw crimp, it is φ 12mm round so that bar section is gradually squeezed transition by 30 × 30mm rectangles, as shown in the faces J-J；Finally
Into the T-type extruded segment 9-2 of lower part, is exported from both ends and squeeze out the rectangular sections 20 × 5mm plank, as shown in the faces L-L.
It is an object of the invention to propose a kind of crowded torsion shaping dies of circular bar and its crowded torsion method, to realize circle
A time of bar, which is squeezed, is twisted into shape, and then is deformed by the way that a series of continuous compound plastics occur, to reach uniformly refinement material
The purpose of material.And combined type cavity is used, manufacture easy to process, disassembling, assembling and replacing.
Above example is only to the exemplary description of this patent does not limit its scope of protection, people in the art
Member can also be changed its part, as long as it does not exceed the essence of this patent, within the protection scope of the present patent.
Claims (7)
1. a kind of circular bar, which squeezes, turns round shaping dies, it is characterised in that：Including punch (1) and squeeze torsion cavity plate；The punch (1) sets
It sets above the crowded torsion cavity plate, and the punch (1) is coaxially disposed with the crowded torsion cavity plate；
The crowded torsion cavity plate includes pressing plate (2), die sleeve (4), positioning sleeve (6), squeezes twisting die (7), positioning pin (8) and bottom squeeze mould
(9)；Die sleeve (4) assembled inside is fixed with mold cavity, and positioning sleeve is set gradually from top to bottom inside the mold cavity
(6), twisting die (7) and bottom squeeze mould (9) are squeezed, die sleeve (4) upper end is fixed by screw group one (3) and the pressing plate (2)
Connection, die sleeve (4) lower end are fixedly connected by screw group two (10) with the pedestal (11), and die sleeve (4) upper end adds
Work has bar import, die sleeve (4) lower end to be machined with two groups of bar outlets；
It is machined with positioning mantle cavity inside the positioning sleeve (6)；It is machined with successively from top to bottom inside the bottom squeeze mould (9)
Portion's changeover portion (9-1) and lower part T-type extruded segment (9-2), deformed sections by rectangle gradual transition to circle, eventually by bottom
T-type channel realize material extrusion molding；Be machined with successively from top to bottom inside the crowded twisting die (7) changeover portion (7-1) and
Lower part, which is squeezed, turns round section (7-2), and the crowded torsion of rectangular section is occurred again by round gradual transition to rectangle for deformed sections；The changeover portion
(7-1) is connected to the positioning mantle cavity, and the lower part is squeezed torsion section (7-2) and is connected to the top changeover portion (9-1).
2. a kind of circular bar according to claim 1, which squeezes, turns round shaping dies, which is characterized in that the positioning sleeve (6) is squeezed
Twisting die (7) and bottom squeeze mould (9) are two semicolumn compositions.
3. a kind of circular bar according to claim 1, which squeezes, turns round shaping dies, which is characterized in that the crowded twisting die (7)
Lower face is machined with semicircle dowel hole one, and bottom squeeze mould (9) upper surface is also machined with and the semicircle positioning
The corresponding semicircle dowel hole two of pin hole one, sets between the semicircle dowel hole one and the semicircle dowel hole two
It is equipped with positioning pin (8), the positioning pin (8) fixes the crowded twisting die (7) and the bottom squeeze mould (9) position.
4. a kind of circular bar according to claim 1, which squeezes, turns round shaping dies, which is characterized in that the mold materials are
5CrNiMo steel.
5. a kind of circular bar according to claim 1, which squeezes, turns round shaping dies, which is characterized in that the crowded twisting die (7)
The inner rectangular section that torsion section (7-2) is squeezed in lower part remains unchanged, and it is 90 ° to squeeze torsion angle γ, squeezes and turns round passage length as 40mm.
6. a kind of a kind of circular bar using described in one of claim 1-5 squeezes the crowded torsion method for turning round shaping dies, feature
It is, this method comprises the following steps：
Step a：The not closed rectangular resistance furnace in top and bottom is placed on hydraulic press workbench, by crowded torsion shaping dies, circle
Bar (5) is placed in resistance furnace, and heating keeps the temperature 30 minutes after reaching specified for temperature ranges；
Step b：After heat preservation, circular bar (5) is put into mold cavity, positioning sleeve is depressed into punch (1)
(6) bottom position keeps the temperature 10 minutes；
Step c：Start hydraulic press, push punch (1), deformation process is specially：Circular bar (5) is in the transition for squeezing twisting die (7)
It is rectangular section that section (7-1), which gradually squeezes transition, then is squeezed in lower part and turn round the crowded twisting strain for completing rectangular section in section (7-2)；Into
The top changeover portion (9-1) for entering bottom squeeze mould (9) gradually squeezes transition as circle afterwards, finally enters the T-type extruded segment of lower part
(9-2) exports extrusion molding from both ends.
7. a kind of circular bar according to claim 6, which squeezes, turns round shaping dies, which is characterized in that the mould in the step a
Has heating temperature range at 250 DEG C~400 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810210369.3A CN108405647A (en) | 2018-03-14 | 2018-03-14 | A kind of circular bar is crowded to turn round shaping dies and its crowded torsion method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810210369.3A CN108405647A (en) | 2018-03-14 | 2018-03-14 | A kind of circular bar is crowded to turn round shaping dies and its crowded torsion method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109290383A (en) * | 2018-11-14 | 2019-02-01 | 江苏科技大学 | A kind of crowded gathering apparatus of rotation for preparing Ultra-fine Grained tubing and method |
| CN110665987A (en) * | 2019-10-12 | 2020-01-10 | 中北大学 | Extrusion forming die of magnesium alloy bar without anisotropy |
| CN111922106A (en) * | 2020-05-22 | 2020-11-13 | 湖南乾龙新材料有限公司 | Continuous torsion extrusion large plastic deformation method and application thereof |
| CN112620371A (en) * | 2020-12-23 | 2021-04-09 | 太原理工大学 | Device and method for preparing fine-grain magnesium alloy through reciprocating torsion, extrusion and deformation |
| CN113560362A (en) * | 2021-07-28 | 2021-10-29 | 太原理工大学 | High-performance magnesium-aluminum alloy variable cross-section extrusion-torsion composite processing device and preparation process thereof |
| CN113941613A (en) * | 2021-09-30 | 2022-01-18 | 哈尔滨工业大学（威海） | Spiral extrusion device and extrusion process for magnesium and magnesium alloy seamless pipes |
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