CN202387762U - Equal channel angular pressing and torsion deformation mold for large plastic forming process - Google Patents

Equal channel angular pressing and torsion deformation mold for large plastic forming process Download PDF

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Publication number
CN202387762U
CN202387762U CN2011205243425U CN201120524342U CN202387762U CN 202387762 U CN202387762 U CN 202387762U CN 2011205243425 U CN2011205243425 U CN 2011205243425U CN 201120524342 U CN201120524342 U CN 201120524342U CN 202387762 U CN202387762 U CN 202387762U
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China
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angle
die
channel
section
forming process
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Expired - Fee Related
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CN2011205243425U
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Chinese (zh)
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李萍
薛克敏
吴战立
王晓溪
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Hefei University of Technology
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Hefei University of Technology
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Abstract

The utility model relates to an equal channel angular pressing and torsion deformation mold for a large plastic forming process. The equal channel angular pressing and torsion deformation mold comprises a male mold (7) and a female mold, wherein an inlet channel (8) and an outlet channel (9) which is in corner communication with the inlet channel (8) are arranged in the female mold, and the inlet channel (8) and the outlet channel (9) have the same cross section; and the male mold (7) is in clearance fit with the inlet channel (8). The equal channel angular pressing and torsion deformation mold for the large plastic forming process is characterized in that: a spiral channel (10) which is formed by a section of spiral groove and has the same cross section with the outlet channel (9) is arranged in the outlet channel (9). According to the equal channel angular pressing and torsion deformation mold for the large plastic forming process, in the process, a corner formed by the inlet channel and the outlet channel supplies strong shearing action to the deformation, and the spiral channel also provides larger shearing deformation amount while increasing the internal hydrostatic pressure when a workpiece deforms, the effective strain is accumulated, the deformation uniformity, and the room temperature strength and comprehensive mechanical properties of deformed metallic materials are improved, a high-performance metallic material is obtained, the treatment cost of the metallic material is reduced, and the yield is improved.

Description

The twisting strain mould is squeezed at the isometrical angle of a kind of big plastic forming process
Technical field
The utility model relates to field of material preparation, and twisting strain (Equal Channel Angular Pressing and Torsion is called for short ECAPT) instrument is squeezed at specifically a kind of isometrical angle for preparing high-performance metal materials.
Background technology
Equal channel angular pressing technology (Equal Channel Angular Pressing, be called for short ECAP) is turned round technology (Twist Extrusion, abbreviation TE) and is used for sever Plastic Deformation and prepares high-performance metal materials with squeezing.When equal channel angular pressing technology prepares high-performance metal materials; Because the cross sectional shape of sample does not change basically before and after the extruding, under the condition that the material processability allows, can repeat extruding to it; Make buildup of material obtain very big plastic deformation, thus crystal grain thinning effectively.Squeeze when turning round the prepared high-performance metal materials; Workpiece has the helical duct of square-section (non-circle) through a centre, realizes big plastic deformation, turns round the size and shape that squeezes the back workpiece and does not change; Thereby can repeat multi-pass and squeeze and to turn round; Accumulate big plastic strain,, improve performance with thinning microstructure.But the both exist single pass heavy deformation less, be out of shape uneven problem.
The utility model content
The utility model is for avoiding above-mentioned existing in prior technology weak point, provides that a kind of deflection is big, the distortion uniformity coefficient is high, equipment requirements is low, flow process is short, and the crowded twisting die tool in the isometrical angle of preparation high-performance metal materials that is easy to make.
The utility model technical solution problem adopts following technical scheme:
The twisting strain mould is squeezed at the isometrical angle of a kind of big plastic forming process; Be provided with punch and die; Be provided with an access road and an exit passageway that is communicated with the access road corner in the said die; Said access road has identical cross section with exit passageway, and said punch and access road matched in clearance is characterized in that: the helical duct that has identical cross-section with exit passageway that is provided with in said exit passageway that one section helical form type groove constitutes.
The utility model design feature also is:
Said die is made up of die one and die two; Said die one and die two have two semicolumns of channel groove for cooperatively interacting; Connect into integral body through bolt, said mould is provided with the stationary magazine creel of the die that is used to pack into, and said stationary magazine creel is the annulus barrel structure; Its bottom is fixedly connected on the counterdie panel seat, and said counterdie panel seat is through being fixedly attached on the forcing press lower table; The die pressing plate is set above said stationary magazine creel, and said die pressing plate is the Circular Plate structure, is used for pushing down die cylinder outer ledge structure downwards; Said punch is positioned and hangs on the punch retainer, and said punch retainer is the square plate structure of middle perforate, and punch retainer is fixedly connected on the upper clamping plate bottom, and said upper clamping plate glides with forcing press and is connected soon.
Said helical duct near an end of access road and the horizontal range between the access road less than processing work length.Said helical duct is taked the rectangular cross section α that rotates to an angle, and its spiral angle and pitch have following relation:
tan β = πD P - - - ( 1 )
Wherein, D is the circumscribed circle diameter of square cross section helical duct, and P is a pitch, and β is a spiral angle; Said β span is 50 ° >=β >=10 °;
The relation of said pitch P and helical duct length L is:
P=L×360/α (2),
Wherein, said cross section anglec of rotation α is 90 ° a integral multiple, and said helical duct length L is 10-50mm.
Said access road and exit passageway cross section are rectangle, and said access road is communicated with the place with exit passageway interior angle angle φ span is 60 °≤φ≤90 °, and said exterior angle angle ψ span is 20 °≤ψ≤60 °.
Said interior angle angle φ is 90 °, and exterior angle angle ψ is: 37 °.
Compared with present technology, the utility model beneficial effect is embodied in:
1, the utility model is in technical process, and the corner that access road and exit passageway form provides powerful shear action to distortion, and helical duct is when increasing workpiece deformation in the inner hydrostatic pressure; Bigger detrusion amount also is provided; The accumulation effective strain improves distortion uniformity coefficient, deformable metal material room temperature strength and comprehensive mechanical property thereof, obtains high-performance metal materials; Reduce the metal material processing cost, improve its lumber recovery.
2, the utility model is used for the extrusion modification shaping of metal material, and refinement interior tissue crystal grain improves material property, and for the compaction of powders material, the pressing hole improves density.
3, the utility model adopts different helical duct length L, can realize the strain accumulation of different-effect, satisfies different grain refining effects and material property and improves the degree requirement.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 1 a is the vertical view that the utility model is removed the patrix panel seat.
Fig. 2, Fig. 2 a are the utility model helical channel structure sketch mapes.Among Fig. 2 a, P is a pitch, and β is a spiral angle, and L is a helical duct length, and α is the cross section anglec of rotation, and D is the circumscribed circle diameter of square cross section helical duct.
Fig. 3 be behind sample behind a time the utility model mould (ECAPT) and existing mold (ECAP) deformation effect relatively, wherein Fig. 3 a is that ECAP-X face, Fig. 3 bECAP-Y face, Fig. 3 c are that ECAP-z face, Fig. 3 d are that ECAPT-X face, Fig. 3 e are that ECAPT-Y face, Fig. 3 f are the ECAPT-Z face.
Fig. 4 is the micro-hardness measurements that the sample behind annealed state, 1 passage ECAP and the 1 passage ECAPT is carried out the firmness change of putting on the cross section of center.
Fig. 5 is the load-stroke curve under each helical duct length of the utility model.
Fig. 6 is the load peaks under each helical duct length of the utility model.
Label among the figure: 1 is the counterdie seat board, and 2 is upper clamping plate, and 3 is stationary magazine creel, and 4 is that die one, 5 is a die two; 6 die pressing plates, 7 is punch, and 8 is punch retainer, and 9 is access road, and 10 is exit passageway; 11 is helical duct, and 12 is that workpiece one, 13 is that workpiece two, 14 is a locating piece.
The utility model is further specified through the specific embodiment below in conjunction with accompanying drawing.
The specific embodiment
Referring to Fig. 1, Fig. 2; The twisting strain mould is provided with punch 7 and die, and die is made up of die 1 and die 25; Die 1 and die 25 have two semicolumns of channel groove for cooperatively interacting; Connect into integral body through bolt, in die, be provided with an access road 9 and an exit passageway 10 that is communicated with access road 9 corners, access road 9 has identical cross section with exit passageway 10; Punch 7 and access road 9 matched in clearance, the helical duct 11 that has identical cross-section with exit passageway 10 that is provided with in exit passageway 10 that one section helical form type groove constitutes.This mould also is provided with the stationary magazine creel 3 of the die that is used to pack into, and stationary magazine creel 3 is the annulus barrel structure, and its bottom is fixedly connected on the counterdie panel seat 1, and counterdie panel seat 1 is connected on the forcing press lower table through bolt; Die pressing plate 6 is set above stationary magazine creel, and the die pressing plate is the Circular Plate structure, and the die pressing plate is connected with alignment pin through screw with stationary magazine creel 4 and is positioned at stationary magazine creel 4 tops, is used for pushing down die top outer edge downwards; Punch 7 hangs on the punch retainer 8 through the alignment pin location, and punch retainer 8 is the square plate structure of middle perforate, and punch retainer 8 is fixedly connected on upper clamping plate 2 bottoms, and upper clamping plate 2 is connected with the forcing press sliding block.
In the practical implementation, helical duct 11 near an end of access road 9 and the horizontal range between the access road less than processing work length.Helical duct is taked the rectangular cross section α that rotates to an angle, and its spiral angle and pitch have following relation:
tan β = πD P - - - ( 1 )
Wherein, D is the circumscribed circle diameter of square cross section helical duct, and P is a pitch, and β is a spiral angle; The β span is 50 ° >=β >=10 °;
The relation of pitch P and helical duct length L is:
P=L×360/α (2),
Wherein, cross section anglec of rotation α is 90 ° a integral multiple, and as 90 °, 180 °, 270 °, 360 ° etc., the helical duct length L is 10-50mm.
Access road 9 is a rectangle with exit passageway 10 cross sections, and access road 9 is communicated with the place with exit passageway 10 interior angle angle φ span is 60 °≤φ≤90 °, and exterior angle angle ψ span is 20 °≤ψ≤60 °.As priority scheme, its interior angle angle φ is 90 °, and exterior angle angle ψ is: 37 °.
The method for using of the utility model mould:
First workpiece 1 put into die channel inlet 9, descending punch 7, punch 7 gets into die access road 9 degree of depth and needs greater than Workpiece length; Backhaul punch 7 is put into second workpiece 2 13, descending punch 7; Punch 7 gets into die access road 9 degree of depth and needs greater than Workpiece length, and the backhaul punch 7 once more, put into the 3rd workpiece; Can take out first workpiece 1 from the exit passageway outlet, accomplish the isometrical angle of 1 passage and squeeze twisting strain.Squeeze first workpiece 1 turning round and continue to put into die channel inlet 9 accomplishing the isometrical angle of 1 passage, accomplish isometrical angle once more and squeeze to be twisted into and to obtain accomplishing the isometrical angle of 2 passages after the shape and squeeze and turn round workpiece, by that analogy, can accomplish the isometrical angle of N passage and squeeze and turn round workpiece, N >=1.Locating piece 14 is used to limit punch maximum downstream distance, and in order to prevent punch and die inner outlet passage rigid collision, placement positioning piece 14 is used to limit punch maximum downstream distance on the top of die.
(with interior angle angle φ is 90 ° to adopt identical interior exterior angle below; Exterior angle angle ψ is: 37 ° for example) mould structure and same process parameter existing mold (ECAP) and the utility model mould (ECAPT); Fine aluminium is carried out ECAP and ECAPT experimental study; Draw to draw a conclusion: (the experiment hydraulic press is that 2000KN presses the torsional test machine, and model is the RZU200HF type; Microscope is inverted metallurgic microscope 4XB-TV, amplifies 400 times; The microhardness tester model: MH-3),
As shown in Figure 3, see that from thinning effect it is narrow and grow that tissue becomes after ECAP a time; Therefore thinning effect is not obvious, behind the ECAPT, because ECAP has experienced one 90 ° rotational shear distortion more; Organize longer and narrowlyer, thinning effect is arranged on the width than being organized in behind initial tissue and the ECAP.
As shown in Figure 4, the product behind annealed state, 1 passage ECAP and the 1 passage ECAPT has been carried out micro-hardness measurement, for ECAP and ECAPPT sample; Respectively central point and marginal point on the main deformed area cross section are measured, selected 5 points throughout respectively, adopt the method for removing mean value of repeatedly measuring; Experimental result is as shown in Figure 4, and behind the 1 passage ECAPT, the sample microhardness increases rapidly; The same with ECAP, the hardness of ECAPT back edge point is less than the center; With the central point is example, and the initial annealing hardness of product is 26.04kg/mm2, and the hardness behind ECAP, the ECAPT is 41.37kg/mm2,43.47kg/mm2, has improved 58.87%, 66.94% respectively, and the hardness behind the ECAPT is greater than ECAP.
Below, adopt identical in the mould structure and the same process CALCULATION OF PARAMETERS machine finite element method at exterior angle, fine aluminium is carried out the ECAPT numerical simulation study of different helical duct length L, draw to draw a conclusion:
In this finite element modelling, choosing the helical duct length L respectively is 10mm, 20mm, 30mm, 40mm and 50mm, and corresponding with it spiral angle β is as shown in table 1.
The corresponding relation of table 1 helical duct length and spiral angle
Helical duct length L (mm) 10 20 30 40 50
Spiral angle β (°) 47.98 29.03 20.30 15.5 12.52
Under the different helical duct length, the situation of change of extruding force is as shown in Figure 5 in the sample single pass ECAPT deformation process.Load-stroke curve under the different helical duct length has essentially identical variation tendency.Along with reducing of helical duct length L, spiral angle β constantly increases, and the severe that material bears detrusion increases gradually, the corresponding rising of extrusion load peak value (Fig. 6).When L=10mm, than traditional ECAP distortion, load peaks rises to 23300N by 11424N, has improved about 1 times.This has all proposed requirements at the higher level to extrusion equipment and mould strength, in experimental design, should take into full account.

Claims (6)

1. the twisting strain mould is squeezed at the isometrical angle of big plastic forming process; Be provided with punch (7) and die; Be provided with an access road (9) and an exit passageway (10) that is communicated with access road (9) corner in the die; Access road (9) has identical cross section with exit passageway (10), and punch (7) and access road (9) matched in clearance is characterized in that: the helical duct (11) that has identical cross-section with exit passageway (10) that is provided with in exit passageway (10) that one section helical form type groove constitutes.
2. the twisting strain mould is squeezed at the isometrical angle of a kind of big plastic forming process according to claim 1; It is characterized in that: said die is made up of die one (4) and die two (5); Said die one (4) and die two (5) have two semicolumns of channel groove for cooperatively interacting; Connect into integral body through bolt, said mould is provided with the stationary magazine creel (3) of the die that is used to pack into, and said stationary magazine creel (3) is the annulus barrel structure; Its bottom is fixedly connected on the counterdie panel seat (1), and said counterdie panel seat (1) is fixedly connected on the forcing press lower table; Die pressing plate (6) is set above said stationary magazine creel, and said die pressing plate is the Circular Plate structure, is used for pushing down die top outer edge downwards; Said punch (7) is positioned and hangs over punch retainer (8) below, and said punch retainer (8) is the square plate structure of middle perforate, and punch retainer (8) is fixedly connected on upper clamping plate (2) bottom, and said upper clamping plate (2) is connected with the forcing press sliding block.
3. the twisting strain mould is squeezed at the isometrical angle of a kind of big plastic forming process according to claim 1 and 2, it is characterized in that: said helical duct (11) near an end of access road (9) and the horizontal range between the access road less than processing work length.
4. squeeze the twisting strain mould according to the isometrical angle of the said a kind of big plastic forming process of claim 3, it is characterized in that: said helical duct is taked the rectangular cross section α that rotates to an angle, and its spiral angle and pitch have following relation:
Wherein, D is the circumscribed circle diameter of square cross section helical duct, and P is a pitch, and β is a spiral angle; Said β span is 50 ° >=β >=10 °;
The relation of said pitch P and helical duct length L is:
P=L×360/α (2),
Wherein, said cross section anglec of rotation α is 90 ° a integral multiple, and said helical duct length L is 10-50mm.
5. squeeze the twisting strain mould according to claim 1 or the isometrical angle of 4 described a kind of big plastic forming process; It is characterized in that: said access road (9) and exit passageway (10) cross section are rectangle; Said access road (9) is communicated with the place with exit passageway (10) interior angle angle φ span is 60 °≤φ≤90 °, and said exterior angle angle ψ span is 20 °≤ψ≤60 °.
6. the twisting strain mould is squeezed at the isometrical angle of a kind of big plastic forming process according to claim 5, and it is characterized in that: said interior angle angle φ is 90 °, and exterior angle angle ψ is: 37 °.
CN2011205243425U 2011-12-14 2011-12-14 Equal channel angular pressing and torsion deformation mold for large plastic forming process Expired - Fee Related CN202387762U (en)

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Application Number Priority Date Filing Date Title
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102513395A (en) * 2011-12-14 2012-06-27 合肥工业大学 Equal channel angular extruding, twisting and deforming mold for large plastic forming process
CN104014608A (en) * 2014-06-05 2014-09-03 徐州工程学院 Multi-corner composite equal channel angular twist extrusion die
CN104438410A (en) * 2014-11-19 2015-03-25 浙江海洋学院 Full-automatic equal channel angular extruding equipment mounting method
CN105013847A (en) * 2015-08-03 2015-11-04 常熟市金华机械股份有限公司 Cold extruding device for asymmetric spline shaft
CN106391743A (en) * 2016-11-18 2017-02-15 山东科技大学 Extrusion device and method for connecting magnesium alloy with aluminum alloy
CN106513453A (en) * 2016-11-18 2017-03-22 山东科技大学 Amorphous alloy hot extrusion device and method
CN107952812A (en) * 2017-12-07 2018-04-24 泰州市博世特精密铸造有限公司 A kind of metal material hydraulic pressure rapid molding device
CN109513762A (en) * 2018-11-27 2019-03-26 清华大学 It is a kind of for producing the method and die device of wide cut magnesium plate
CN109675948A (en) * 2019-01-07 2019-04-26 哈尔滨理工大学 A kind of high-strength high-toughness magnesium alloy variable conduit squeezes and Rolling compund molding machine and method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102513395A (en) * 2011-12-14 2012-06-27 合肥工业大学 Equal channel angular extruding, twisting and deforming mold for large plastic forming process
CN104014608A (en) * 2014-06-05 2014-09-03 徐州工程学院 Multi-corner composite equal channel angular twist extrusion die
CN104014608B (en) * 2014-06-05 2016-01-06 徐州工程学院 Twisting die tool is squeezed at many corners composite equal diameter angle
CN104438410A (en) * 2014-11-19 2015-03-25 浙江海洋学院 Full-automatic equal channel angular extruding equipment mounting method
CN105013847A (en) * 2015-08-03 2015-11-04 常熟市金华机械股份有限公司 Cold extruding device for asymmetric spline shaft
CN106391743A (en) * 2016-11-18 2017-02-15 山东科技大学 Extrusion device and method for connecting magnesium alloy with aluminum alloy
CN106513453A (en) * 2016-11-18 2017-03-22 山东科技大学 Amorphous alloy hot extrusion device and method
CN106391743B (en) * 2016-11-18 2018-03-06 山东科技大学 A kind of pressurizing unit and method for connecting magnesium alloy and aluminium alloy
CN106513453B (en) * 2016-11-18 2018-10-16 山东科技大学 A kind of non-crystaline amorphous metal thermal-squeezing device and method
CN107952812A (en) * 2017-12-07 2018-04-24 泰州市博世特精密铸造有限公司 A kind of metal material hydraulic pressure rapid molding device
CN109513762A (en) * 2018-11-27 2019-03-26 清华大学 It is a kind of for producing the method and die device of wide cut magnesium plate
CN109675948A (en) * 2019-01-07 2019-04-26 哈尔滨理工大学 A kind of high-strength high-toughness magnesium alloy variable conduit squeezes and Rolling compund molding machine and method

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