CN101797596B - Convex and concave die cavity mating structure of equal channel angular extrusion device - Google Patents
Convex and concave die cavity mating structure of equal channel angular extrusion device Download PDFInfo
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- CN101797596B CN101797596B CN2010101346189A CN201010134618A CN101797596B CN 101797596 B CN101797596 B CN 101797596B CN 2010101346189 A CN2010101346189 A CN 2010101346189A CN 201010134618 A CN201010134618 A CN 201010134618A CN 101797596 B CN101797596 B CN 101797596B
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Abstract
The invention provides a convex and concave die cavity mating structure of an equal channel angular extrusion device, belonging to the technical field of material extrusion processing and relating to improvement of the equal channel angular extrusion device. The structure comprises a convex die [2] and a concave die and is characterized in that the convex die [2] is provided with a guide bar [6] with rectangular section; the upper end face of an extrusion rod [4] and the lower end face of a pressure board [5] are connected into a whole; the extrusion rod [4] and the guide bar [6] are integrally processed and shaped; the concave die cavity comprises an extrusion channel and a guide channel [9]; the left side of the guide channel [9] is coplanar with the right side of an extrusion entrance channel [7]; and the height of the guide channel [9] is more than that of the guide bar [6]. The structure remarkably strengthens the rigidity of the convex die and reduces the friction between the samples and the die walls, thereby prolonging the service life of the convex die and eliminating the potential safety hazard.
Description
Technical field
The invention belongs to material extrusion process technical field, relate to improvement equal channel angular extrusion device.
Background technology
Super fine crystal material is subjected to extensive concern because of having the good mechanical property and the unique physical property that are different from traditional material.Up to the present, the technology of the ultra-fine crystalline substance of a lot of preparations has been arranged, as high-energy ball milling, the pressurization of inert gases agglomeration original position, high undercooling direct crystallization, amorphous crystallization, large plastometric set etc.The large plastometric set technology is divided into high pressure torsion, equal channel angular extruding (ECAE or ECAP), multiway forging and roll compacting etc. repeatedly again, and wherein ECAE is considered to a kind of ultra-fine brilliant preparation technology that future in engineering applications is arranged very much.Fig. 1 is an ECAE technology basic principle schematic, and the ECAE mould is equated by two cross sections and crossing at a certain angle passage constitutes, and the interior angle of two passages is Φ, and under the effect of punch 2 pressure, sample 1 produces approximate detrusion in the corner of squeezing passage.Because the cross sectional shape after the sample extruding does not change, multi-pass pushes the purpose that reaches continuous crystal grain thinning repeatedly.At present, many different ECAE extrusion dies have been developed both at home and abroad, but there is following major defect in these moulds: the punch of existing mold is designed to simple drift usually, all is like this as patent US7191630, US5850755, CN2584308, CN101259493, CN1792487, CN1712155, CN1704485, CN1357420, CN200988058, CN2455398 etc.Fig. 2 is the structural representation of the existing simple punch type punch of ECAE mould.From mechanics of materials angle analysis, the most outstanding shortcoming of this simple punch type structural design is to lack enough rigidity., sample ratio of height to diameter higher when the intensity that is extruded material is when big (〉=2.5) or mould interior angle Φ less (＜90 °), drift is because of being subjected to very big opposition and bending easily or rupturing unstability in extrusion process, the flexibility of ECAE mould interior angle selection and the scope and the size of machinable material have greatly been limited, the service life of having reduced punch.In addition, the die wall of formation existing mold squeezing passage is normally fixed, and the frictional force during extruding between sample and the die wall is bigger, has not only reduced the surface quality of extruded sample, has also increased the bearing load of punch.In addition, also may collapse near the broken operating personnel that cut injuring of metal when drift ruptures suddenly, exist certain potential safety hazard.
Summary of the invention
The objective of the invention is: propose a kind of rigidity that can improve punch, reduce the punch and the concave die cavity matching structure of the equal channel angular extrusion device of frictional force between sample and the die wall,, eliminate safe hidden trouble to improve the service life of punch.
Technical scheme of the present invention is: a kind of punch of equal channel angular extrusion device and concave die cavity matching structure, comprise punch and die, and punch comprises pressing plate and pressure ram, the upper end of pressure ram and the lower surface of pressing plate are connected to integral body; Concave die cavity is made up of the half module die cavity on the die half module die joint that is positioned at two symmetries, behind two die half module matched moulds, two half module die cavities are combined to form complete concave die cavity, concave die cavity comprises one by vertical extruding access road and the squeezing passage that becomes with the extruding outlet channel group of its connection, the angle of extruding access road and extruding exit passageway is mould interior angle Φ, the rectangle of cross section for equating of extruding access road and extruding exit passageway, the upper port of extruding access road is positioned at the upper surface of die, and the external port of extruding exit passageway is positioned at the side of die; It is characterized in that,
(1) cross section being arranged on the said punch is the guide post of rectangle, the cross-sectional width of guide post is not less than 2 times of pressure ram cross-sectional width, the cross-sectional length of guide post is not less than the cross-sectional length of pressure ram, the height of guide post is at least 3 times of pressure ram height, pressure ram is positioned at the left surface of guide post, the upper surface of guide post and the lower surface of pressing plate are connected to integral body, and guide post and pressure ram one shape;
(2) said concave die cavity is made up of squeezing passage and guide channel, and the cross section of guide channel is a rectangle, with the guide post matched in clearance, and the left surface of guide channel and the right flank coplane that pushes access road, the height of guide channel is greater than the height of guide post.
Advantage of the present invention is: significantly strengthened the rigidity of punch, reduced the frictional force between sample and the die wall, thereby improved the service life of punch, eliminated potential safety hazard.Evidence, punch service life of one embodiment of the present of invention is than having improved more than 5 times the service life of simple punch type punch.ECAE mould with structure of the present invention is not only applicable to the ECAE processing of low-intensity alloys such as aluminium, copper, and is applicable to the ECAE processing of high-strength alloy such as titanium, tungsten and intermetallic compound etc.
Description of drawings
Fig. 1 is an ECAE technology basic principle schematic.
Fig. 2 is the structural representation of the existing simple punch type punch of ECAE mould.
Fig. 3 is a structural representation of the present invention.
The specific embodiment
Below in conjunction with Fig. 3 and embodiment the present invention is described in further details, but protection scope of the present invention is not limited to described embodiment.For convenience of explanation, stipulate that left and right directions is the width in pressure ram 4 cross sections among Fig. 3, inward-outward direction is the length direction in pressure ram 4 cross sections, and above-below direction is the short transverse of pressure ram 4.A kind of punch of equal channel angular extrusion device and concave die cavity matching structure comprise punch 2 and die, and punch 2 comprises pressing plate 5 and pressure ram 4, and the lower surface of the upper end of pressure ram 4 and pressing plate 5 is connected to integral body; Concave die cavity is made up of the half module die cavity on die half module 3 die joints that are positioned at two symmetries, behind two die half module matched moulds, two half module die cavities are combined to form complete concave die cavity, concave die cavity comprises a squeezing passage of being made up of vertical extruding access road 7 and the extruding exit passageway 8 that is communicated with it, the angle of extruding access road 7 and extruding exit passageway 8 is mould interior angle Φ, the rectangle of cross section for equating of extruding access road 7 and extruding exit passageway 8, the upper port of extruding access road 7 is positioned at the upper surface of die, and the external port of extruding exit passageway 8 is positioned at the side of die; It is characterized in that,
(1) guide post 6 that on the said punch 2 cross section to be arranged be rectangle, the cross-sectional width of guide post 6 is not less than 2 times of pressure ram 4 cross-sectional widths, the cross-sectional length of guide post 6 is not less than the cross-sectional length of pressure ram 4, the height of guide post 6 is at least 3 times of pressure ram 4 height, pressure ram 4 is positioned at the left surface of guide post 6, the lower surface of the upper surface of guide post 6 and pressing plate 5 is connected to integral body, and guide post 6 shapes with pressure ram 4 one;
(2) said concave die cavity is made up of squeezing passage and guide channel 9, the cross section of guide channel 9 is a rectangle, with guide post 6 matched in clearance, the left surface of guide channel 9 and the right flank coplane that pushes access road 7, the height of guide channel 9 is greater than the height of guide post 6.
Operation principle of the present invention is: because pressure ram 4 is that one shapes with guide post 6, thereby greatly improved punch rigidity.The left side wall of guide post 6 constitutes the right side wall of extruding access road 7, and it moves downward together with sample 1 in extrusion process, can obviously reduce the surface quality that sample contacts the extrusion friction power of guide post one side and improves extruded sample.
Embodiment one:
Design punch and the concave die cavity matching structure that a cover is used for square-section sample processing according to the principle of the invention, concrete parameter is: mould interior angle Φ=90 °, the sectional dimension of squeezing passage is 22mm * 22mm, the height of extruding access road 7 is 200mm, the height of pressure ram 4 is 200mm, cross-sectional width * the length dimension of guide post 6 is 50mm * 40mm, highly is 620mm, and the height of guide channel is 660mm.The ECAE mould that use has this cover punch and concave die cavity matching structure has carried out the extruding of passages up to a hundred at 500 ℃ to the titanium alloy sample of a collection of 21.9mm of being of a size of * 21.9mm * 160mm, and the punch duty is good.
Embodiment two:
Existing ECAE mould with simple punch type punch design can't carry out the extruding of the tabular sample of high strength owing to lack enough rigidity, even during the plate tensile sample of crushing strength very low (as pure A1) service life of punch also very short, push tens passages usually after punch flexural deformation has just taken place.Design punch and the concave die cavity matching structure that a cover is used for plate tensile sample processing according to the principle of the invention, concrete parameter is: mould interior angle Φ=105 °, cross-sectional width * the length dimension of squeezing passage is 6mm * 50mm, the height of extruding access road 7 is 120mm, the height of pressure ram 4 is 120mm, cross-sectional width * the length dimension of guide post 6 is 40mm * 80mm, highly is 380mm, and the height of guide channel is 420mm.Use has this ECAE mould that overlaps punch and concave die cavity matching structure is of a size of 5.9mm * 49.9mm * 100mm 100 ℃ of extruding 7050 high strength alumin ium alloy plate tensile samples, punch always pushes and still keeps good working order after passage has surpassed 120 times, than having improved more than 5 times the service life of simple punch type punch.
Claims (1)
1. the punch of an equal channel angular extrusion device and concave die cavity matching structure comprise punch [2] and die, and punch [2] comprises pressing plate [5] and pressure ram [4], and the lower surface of the upper end of pressure ram [4] and pressing plate [5] is connected to integral body; Concave die cavity is made up of the half module die cavity on die half module [3] die joint that is positioned at two symmetries, behind two die half module matched moulds, two half module die cavities are combined to form complete concave die cavity, concave die cavity comprises a squeezing passage of being made up of vertical extruding access road [7] and the extruding exit passageway [8] that is communicated with it, the angle of extruding access road [7] and extruding exit passageway [8] is mould interior angle Φ, the rectangle of the cross section of extruding access road [7] and extruding exit passageway [8] for equating, the upper port of extruding access road [7] is positioned at the upper surface of die, and the external port of extruding exit passageway [8] is positioned at the side of die; It is characterized in that,
(1) cross section being arranged on the said punch [2] is the guide post of rectangle [6], the cross-sectional width of guide post [6] is not less than 2 times of pressure ram [4] cross-sectional width, the cross-sectional length of guide post [6] is not less than the cross-sectional length of pressure ram [4], the height of guide post [6] is at least 3 times of pressure ram [4] height, pressure ram [4] is positioned at the left surface of guide post [6], the lower surface of the upper surface of guide post [6] and pressing plate [5] is connected to integral body, and guide post [6] shapes with pressure ram [4] one;
(2) said concave die cavity is made up of squeezing passage and guide channel [9], the cross section of guide channel [9] is a rectangle, with guide post [6] matched in clearance, the left surface of guide channel [9] and the right flank coplane that pushes access road [7], the height of guide channel [9] is greater than the height of guide post [6].
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101346189A CN101797596B (en) | 2010-03-30 | 2010-03-30 | Convex and concave die cavity mating structure of equal channel angular extrusion device |
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| CN2010101346189A CN101797596B (en) | 2010-03-30 | 2010-03-30 | Convex and concave die cavity mating structure of equal channel angular extrusion device |
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| CN101797596B true CN101797596B (en) | 2011-12-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6399215B1 (en) * | 2000-03-28 | 2002-06-04 | The Regents Of The University Of California | Ultrafine-grained titanium for medical implants |
| CN2690068Y (en) * | 2003-06-21 | 2005-04-06 | 大连理工大学 | Device for preparing super fine grain crystal pipe by equal passage corner extrusion |
| CN2850740Y (en) * | 2005-12-14 | 2006-12-27 | 山东大学 | Iso-radius angular pressing mould |
| US7191630B2 (en) * | 2003-07-25 | 2007-03-20 | Engineered Performance Materials Co., Llc | Method and apparatus for equal channel angular extrusion of flat billets |
| CN101570070A (en) * | 2008-04-30 | 2009-11-04 | 西北工业大学 | Self-guided equal channel extruding device and extruding method |
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- 2010-03-30 CN CN2010101346189A patent/CN101797596B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6399215B1 (en) * | 2000-03-28 | 2002-06-04 | The Regents Of The University Of California | Ultrafine-grained titanium for medical implants |
| CN2690068Y (en) * | 2003-06-21 | 2005-04-06 | 大连理工大学 | Device for preparing super fine grain crystal pipe by equal passage corner extrusion |
| US7191630B2 (en) * | 2003-07-25 | 2007-03-20 | Engineered Performance Materials Co., Llc | Method and apparatus for equal channel angular extrusion of flat billets |
| CN2850740Y (en) * | 2005-12-14 | 2006-12-27 | 山东大学 | Iso-radius angular pressing mould |
| CN101570070A (en) * | 2008-04-30 | 2009-11-04 | 西北工业大学 | Self-guided equal channel extruding device and extruding method |
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