CN108526236B - Near-equal channel multi-corner continuous extrusion device - Google Patents

Near-equal channel multi-corner continuous extrusion device Download PDF

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Publication number
CN108526236B
CN108526236B CN201810209115.XA CN201810209115A CN108526236B CN 108526236 B CN108526236 B CN 108526236B CN 201810209115 A CN201810209115 A CN 201810209115A CN 108526236 B CN108526236 B CN 108526236B
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extrusion
die
wheel
arc
plug
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CN108526236A (en
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万鹏
陈应强
李绍平
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Chongqing Shenji New Material Technology Co.,Ltd.
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Sichuan Rand Starr Aluminum Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/005Continuous extrusion starting from solid state material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/21Presses specially adapted for extruding metal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/21Presses specially adapted for extruding metal
    • B21C23/212Details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/21Presses specially adapted for extruding metal
    • B21C23/217Tube extrusion presses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00Profiling tools for metal extruding
    • B21C25/02Dies

Abstract

The invention discloses a near-equal channel multi-corner continuous extrusion device which comprises an extrusion wheel and an extrusion die, wherein the extrusion die is provided with an arc-shaped friction surface with the same radian as the extrusion wheel, the outer edge of the extrusion wheel is provided with a wheel groove matched with a rod blank, and the rod blank is positioned between the wheel groove and the arc-shaped friction surface and is extruded to a feed port of the extrusion die; according to the near-equal channel multi-corner continuous extrusion device, the rod blank is peeled through the matching of the main plug and the auxiliary plug, grains after near-equal channel multi-corner continuous extrusion are refined through the shunt bridge, the refining is completed through four total corners opposite to each other in space, and the extrusion coefficient is increased through the longer near-equal channel and the multiple corners.

Description

Near-equal channel multi-corner continuous extrusion device
Technical Field
The invention relates to the field of aluminum alloy extrusion, in particular to a near-equal-channel multi-corner continuous extrusion device.
Background
The manufacture of aluminum alloy parallel flow tubes for heat exchangers is almost always carried out by the conventional forward extrusion process or continuous extrusion process.
In the conventional isodiametric angular extrusion method which is vigorously researched at home and abroad, the shapes and the areas of the cross sections of an outlet channel and an inlet channel in an extrusion die are the same, the axes of the two channels are intersected at a certain angle, a sample is extruded downwards under the action of the pressure of a punch in the extrusion process, local large shearing deformation is generated at the corner of the channel, a large strain is obtained, dislocation is rearranged at the moment, an original crystal grain is divided by a subgrain, the grain boundary is not broken and has high angle, and thus an ultrafine crystal grain structure is obtained.
From the basic principle of the continuous extrusion method, because of the mode of 90-degree shear deformation, radial continuous extrusion is similar to primary equal-channel deformation, while tangential continuous extrusion is similar to secondary equal-channel deformation, and the grains are broken well, the structure is uniform, and the grains are fine. However, the continuous extrusion methods of the prior art all have the following disadvantages:
1. for the split forward extrusion method
The raw material for extrusion is a cast rod, although the cast rod has good tissue cleanliness, the tissue density is poor; the extrusion ratio is large, and the equipment operation cost is high; the extrusion ratio can be reduced and the productivity can be improved by adopting one die with more extrusion, but the tissue compactness of an extruded product is greatly reduced, so that the product quality is reduced; the extrusion production line has large investment and high equipment depreciation rate; the size and the shape of the mold core are complex, the strength and the wear resistance become important problems influencing the service life of the mold, and the service life of the mold directly influences the production cost; the yield of the extruded material is low (only 65-70%).
2. For single groove radial continuous extrusion process
The extrusion raw material adopts continuous casting and rolling rod material, the internal structure is easy to be mixed and aerated, the surface and subsurface of the rod material are mixed with embedded objects, micro cracks or pits, folds and even cavities generated by continuous rolling, the shape precision of the rod material is poor, and the like; the extrusion ratio is low, particularly the tissue density is poor compared with a one-outlet flow dividing forward extrusion method; cannot meet the quality requirements of the prior microchannel parallel flow pipe product, and gradually or completely quits the market of parallel flow pipe extrusion.
3. For single-wheel double-groove tangential continuous extrusion method
The effect of the adverse tissues of the surface and the subsurface of the rod material, which are brought by double-rod feeding, on the quality of the extruded product is higher than that of a single-groove radial continuous extrusion method; the assembly precision of the die is poor, and the service life is short; the extrusion force is large, and the process cost is high; the material yield is lower than that of the radial single-groove extrusion, and the total operation cost is slightly higher than that of the single-groove radial continuous extrusion method.
The reason for this is:
the forward extrusion method of the split flow combined die corresponds to the diameter of an extrusion cylinder of the split flow combined die, and the cast bar stock is generally over phi 80 mm; the surface, head and none of the billet produced by the casting process must be mechanically removed prior to extrusion to ensure that the undesirable structures do not become incorporated into the extruded product. When the extrusion is carried out in the forward direction, the movement direction of the extrusion rod is consistent with the discharge direction of an extruded product, and the deformed metal and the inner wall of the extrusion container slide relatively to each other, so that great friction resistance is generated. The frictional resistance causes extremely uneven metal flow, causes a series of defects of extrusion compression tail, uneven structure performance and the like (the head and the non-product extruded by each cast rod are discarded) on one hand, and obviously reduces the yield, and increases the extrusion energy consumption (30 to 40 percent of the energy consumption is used for overcoming the harmful friction in the actual production), limits the extrusion speed and accelerates the die abrasion on the other hand, thereby influencing the production efficiency and increasing the production cost. The minimum wall thickness of the extrudable material is less than 0.5mm, the tolerance of the external dimension of the section is less than +/-0.10 mm, and the tolerance of the wall thickness is less than +/-0.05 mm. When a conventional shunting die is used for extruding precision profiles such as a microchannel parallel flow pipe, the service life of the die (particularly the strength and wear resistance of a shunting bridge and a die core) and the material flow during extrusion become main factors influencing the production of the precision profiles.
Due to the defects of the process structure of the production of the continuous casting and rolling aluminum alloy rod material, namely that continuous casting nest air inclusion, a continuous rolling defective structure and various foreign objects are inevitably pressed into the subsurface layer of the aluminum rod, and additionally, the surface of the aluminum rod is micro-cracked or pitted, folded or even hollow, and the like, the rod material has poor shape precision and the like, theoretically, the influence result of the continuously extruded defective structure analyzed in the above way is turned over; certainly, the quality influence of the extrusion product with the poor surface layer and subsurface layer tissues can be greatly improved due to the overflow of the aluminum material in the continuous extrusion process (the poor tissues on the surface of the rod material can be eliminated along with the overflow); even so, it is an objective fact that the purity of the inner and outer tissues of the raw material in the continuous extrusion method is inferior to that in the conventional extrusion.
Disclosure of Invention
The invention aims to solve the problems and provide a near-equal channel multi-corner continuous extrusion device.
The invention realizes the purpose through the following technical scheme:
a near-equal channel multi-corner continuous extrusion device comprises an extrusion wheel and an extrusion die, wherein the extrusion die is provided with an arc-shaped friction surface with the same radian as the extrusion wheel, the outer edge of the extrusion wheel is provided with a wheel groove matched with a rod blank, and the rod blank is positioned between the wheel groove and the arc-shaped friction surface and is extruded to a feed inlet of the extrusion die;
extrusion die includes mould main part, main end cap, vice end cap, reposition of redundant personnel bridge and feed chute, ARC surface sets up in the mould main part, the feed inlet sets up ARC surface's middle part, main end cap sets up the rear side of feed inlet, vice end cap sets up the leading flank of feed inlet, mould main part inside be provided with the chamber is closed in the seam that converges of feed inlet intercommunication, reposition of redundant personnel bridge sets up converge and close the intracavity, and be located the below of feed inlet, converge and close the intracavity and be provided with the discharge gate, the feed chute sets up in the feed inlet.
Specifically, the reposition of redundant personnel bridge is the triangle block structure, the contained angle of the reposition of redundant personnel point of reposition of redundant personnel bridge is 120, the reposition of redundant personnel bridge with the cross-sectional area of reposition of redundant personnel passageway between the medial surface in confluence welding chamber increases from feed inlet to discharge gate in proper order.
Preferably, the main plugs are located in wheel grooves of the extrusion wheel, and a gap is formed between the outer side faces of the main plugs and the inner side faces of the wheel grooves.
Furthermore, a flash groove is arranged on the arc-shaped friction surface, the flash groove is perpendicular to the plane where the extrusion wheel is located, and the inlet end of the flash groove is located on the front side of the auxiliary plug.
Specifically, the main plug, the auxiliary plug, the arc-shaped friction surface and the feed chute are detachably connected with the die body.
Preferably, the main plug, the auxiliary plug, the arc-shaped friction surface and the feed chute are detachably connected with the die body through a hot-embedding method.
Preferably, the discharge port is connected with a parallel flow pipe arranged along the axial direction of the confluence welding cavity.
The invention has the beneficial effects that:
the near-equal channel multi-corner continuous extrusion device peels off a rod blank through the matching of the main plug and the auxiliary plug, and then refines grains after near-equal channel multi-corner continuous extrusion through the shunt bridge, wherein the grain refinement is finished by four total corners opposite to each other in space, and the longer near-equal channel and multi-corner increase the extrusion coefficient.
Drawings
FIG. 1 is a cross-sectional view of a near-equal channel multi-corner continuous extrusion apparatus according to the present invention;
fig. 2 is a partial schematic view of the main plug and the squeeze wheel of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 and 2, the near-equal channel multi-corner continuous extrusion device of the present invention comprises an extrusion wheel 8 and an extrusion die, wherein the extrusion die is provided with an arc-shaped friction surface 2 with the same radian as the extrusion wheel 8, the outer edge of the extrusion wheel 8 is provided with a wheel groove adapted to a rod blank, and the rod blank is positioned between the wheel groove and the arc-shaped friction surface 2 and is extruded to a feed port 4 of the extrusion die;
the extrusion die comprises a die main body 1, a main plug 3, an auxiliary plug, a shunt bridge 6 and a feed chute 5, wherein an arc-shaped friction surface 2 is arranged on the die main body 1, a feed inlet 4 is arranged in the middle of the arc-shaped friction surface 2, the main plug 3 is arranged at the rear side of the feed inlet 4, the auxiliary plug is arranged at the front side of the feed inlet 4, a confluence welding cavity communicated with the feed inlet 4 is arranged inside the die main body 1, the shunt bridge 6 is arranged in the confluence welding cavity and is positioned below the feed inlet 4, a discharge outlet 7 is arranged in the confluence welding cavity, the feed chute 5 is arranged in the feed inlet 4, the main plug 3 is positioned in a wheel groove of an extrusion wheel 8, a gap 9 is arranged between the outer side surface of the main plug 3 and the inner side surface of the wheel groove, a flash groove is arranged on the arc-shaped friction surface 2 and is vertical to the plane where the extrusion wheel 8 is positioned, and, the shunting bridge 6 is a triangular block structure, the included angle of the shunting point of the shunting bridge 6 is 120 degrees, and the cross-sectional area of a shunting channel between the shunting bridge 6 and the inner side surface of the confluence welding cavity is sequentially increased from the feeding hole 4 to the discharging hole 7.
The main plug 3, the auxiliary plugs, the arc-shaped friction surfaces 2 and the feed chute 5 are detachably connected with the die body, and the main plug 3, the auxiliary plugs, the arc-shaped friction surfaces 2 and the feed chute 5 are detachably connected with the die body through a hot-inlaying method.
The working principle of the near-equal channel multi-corner continuous extrusion device is as follows:
firstly, under the condition of the existing mature raw material for continuous extrusion of continuous casting and continuous rolling aluminum alloy rod materials or horizontal continuous casting rod materials; then according to the oil-free production reality of the current continuous casting and rolling aluminum alloy rod and the oil-free continuous casting process of the horizontal continuous casting rod material, a rod material chemical cleaning process method in a continuous extrusion method is abandoned, and the surface of the aluminum alloy rod material is mechanically cleaned by adopting a wet sand blasting method; finally, according to practical experience and theoretical research in the process of producing the parallel flow pipe by long-term tangential continuous extrusion, the method is used for producing the ultrahigh-quality microchannel parallel flow pipe and other high-precision welding extrusion products:
1. an on-line peeling technique in the extrusion process. According to the principle of continuous extrusion, the main plugs 3 are matched with the extrusion wheel 8, a certain three-side peeling function of the aluminum alloy rod material is actually formed, the auxiliary plugs are arranged at appropriate positions in front of the feeding groove 5, the main plugs 3 are matched with the auxiliary plugs to form a four-side peeling function, and therefore the complete online peeling effect of the aluminum alloy rod material is achieved.
2. The main plug 3, the auxiliary plug, the arc-shaped friction surface 2 and the feeding groove 5 of the extrusion die can be replaced, and the abrasion of the arc-shaped friction surface 2, the feeding groove 5, the main plug 3 and the auxiliary plug can cause the flow speed, pressure fluctuation and change in a welding cavity to influence the extrusion quality; the technology of the replaceable assembly ensures the long-term high-quality stable production of the extruded product, and the die cavity body can be used for a longer time and reduces the consumption of an extruding tool and a die.
3. The principle of equal channel and multiple corners is organically combined with the tangential continuous extrusion principle, and the optimal total four corners which are opposite in pairs and are arranged in a die cavity in a single-groove tangential continuous extrusion mode and the approximate equal channel structure design which meets the extrusion requirement are arranged, so that the uniform and fine aluminum alloy grain structure and the second phase which is dispersedly distributed are obtained under the condition of not breaking through the maximum extrusion ratio of the continuous extrusion method.
The method comprises the following steps:
1. on-line peeling
The continuous extrusion process can be understood visually as: the rod blank itself is both the material being extruded and the rod is extruded. The rod blank entering the front section of the groove of the extrusion wheel 8 moves forwards under the action of friction force, and the blank per se has enough strength due to the lower temperature at the moment, so that the rod blank can be considered as an 'extrusion rod'; in the rear section of the groove of the extrusion wheel 8, which has reached its forming temperature due to the increase in temperature caused by the friction effect, it is considered as a "billet", which is continuously extruded from the die orifice under the drive of the "extrusion stem" of the front section. In the stable production process, the front section extrusion rod is continuously converted into a rear section blank, and the connection position of the front section and the rear section is kept unchanged.
Since the billet just fills the deformation space and does not reach the temperature required for plastic flow, the extrusion resistance of the billet from the gap (working gap) between the extrusion wheel 8 and the die cavity is large, which is equivalent to the closing of the deformation space, so that the pressure rises sharply. The friction force is increased while the pressure is increased, thereby further improving the effective extrusion driving force. On the other hand, the temperature also continues to rise, raising the conditions for subsequent deformation.
Because of the relative movement between the extrusion wheel 8 and the extrusion die, a small gap must be left to ensure that the two do not contact and wear. And simultaneously, the device is also a drainage channel of a bad tissue on the surface of the main plug and the auxiliary plug after the main plug and the auxiliary plug act with the rod material, because the surface layer of the rod material is filled in the gap firstly, the complete online peeling of the rod material such as continuous casting and rolling is finished.
2. The replaceable main plug 3, the auxiliary plug, the arc friction surface 2 and the feeding chute 5 of the extrusion die,
in order to solve the problem that the quality fluctuation, continuous reduction and the like of an extrusion product are caused by the change of the speed of an extrusion feeding section due to the abrasion of a main plug 3, an auxiliary plug, a feeding groove 5 and an arc-shaped friction surface 2 in actual production, the increase of overflow is inevitable for the abrasion of key functional structures, the appearance of a combined die cavity with replaceable vulnerable key parts is promoted for ensuring the stability of the extrusion quality without replacing the whole expensive die cavity, and the matching precision can be conveniently ensured by combining a mature hot embedding method with a die cavity body.
3. Near equal channel multi-corner continuous extrusion
Generally, equal-channel multi-corner extrusion is completed as a continuous process, and the process can be called equal-channel multi-corner continuous extrusion. However, the more the corners are, the higher the extrusion force is, the more impossible the possibility of production realization is, so the true equal-channel multi-corner continuous extrusion still stays in theory, and the continuous result research of the discontinuous equal-channel multi-corner extrusion test in the laboratory.
For this reason, we propose the concept of "near equal channel multi-corner continuous extrusion". That is, the concept of near-equal channel multi-corner continuous extrusion is attached to continuous extrusion (the confirm method), and according to the conventional and design concept of reducing the extrusion force to the maximum extent, the metal flow channel of the method is nearly circular and gradually enlarged, so that the channels are converted into 'approximate' -near-equal channels; no matter the continuous extrusion is radial or tangential, the process that the metal flows to the feed inlet 4 of the extrusion die from the action of the main plug 3 is actually performed at a corner of 90 degrees, namely, at a channel corner; different from the direct die orifice of the radial extrusion metal, the direct die orifice of the tangential continuous extrusion (CONKLAD method) process is realized only after the metal flow is subjected to 90-degree rotation angle under a large channel once in the die cavity.
The extruded material in the wheel groove of the extrusion wheel 8 of the equal channel enters a gradually enlarged flow-promoting shunt channel through a feed inlet 4 through a corner close to 90 degrees under the blocking of a main plug 3 by an arc-shaped friction surface 2, the aluminum material divided into two enters a confluence welding cavity of a larger channel, the aluminum flow direction in the confluence welding cavity and the aluminum flow direction of the shunt channel are distributed at any included angle within the range of 360 degrees at the moment, and the aluminum flow direction is spatially vertical to the aluminum flow direction of the extrusion wheel 8 groove in the corner process; after the pressure of the confluence welding cavity is equalized, the aluminum materials distributed at any included angle within 360 degrees are extruded into products through welding dies such as parallel flow tubes through a corner close to 90 degrees.
In fig. 1, under the action of the diversion bridge 6, the aluminum flow entering the main diversion channel through the first 90-degree left and right corners is divided into two symmetrical left and right aluminum flows through the 120-degree left and right corners, i.e. the process of the nearly equal channel corner; then the left and right aluminum flows are extruded at the corners of the almost equal channel which is corresponding to and opposite to the corners, and the aluminum flows enter the confluence welding cavity for pressure equalization after passing through the secondary corners of the almost equal channel.
Therefore, the near-equal channel multi-corner continuous extrusion patented technology arranges the total four corners opposite to each other in space pursued by the traditional equal channel multi-corner extrusion in a die cavity in a single-groove tangential continuous extrusion mode.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims (5)

1. The utility model provides a nearly equal passageway many corners continuous extrusion device which characterized in that: the extrusion die is provided with an arc-shaped friction surface with the same radian as the extrusion wheel, a wheel groove matched with a rod blank is formed in the outer edge of the extrusion wheel, and the rod blank is positioned between the wheel groove and the arc-shaped friction surface and is extruded to a feeding hole of the extrusion die;
the extrusion die comprises a die main body, a main plug, an auxiliary plug, a flow distribution bridge and a feeding groove, wherein the arc-shaped friction surface is arranged on the die main body, the feeding hole is arranged in the middle of the arc-shaped friction surface, the main plug is arranged on the rear side of the feeding hole, the auxiliary plug is arranged on the front side of the feeding hole, a confluence welding cavity communicated with the feeding hole is arranged in the die main body, the flow distribution bridge is arranged in the confluence welding cavity and is positioned below the feeding hole, a discharging hole is arranged in the confluence welding cavity, and the feeding groove is arranged in the feeding hole;
the shunting bridge is of a triangular block structure, the included angle of shunting points of the shunting bridge is 120 degrees, and the cross-sectional area of a shunting channel between the shunting bridge and the inner side surface of the confluence welding cavity is sequentially increased from a feed port to a discharge port;
the main plug is positioned in the wheel groove of the extrusion wheel, and a gap is formed between the outer side surface of the main plug and the inner side surface of the wheel groove.
2. The near-equal channel multi-corner continuous extrusion device of claim 1, wherein: and a flash groove is arranged on the arc-shaped friction surface, the flash groove is vertical to the plane where the extrusion wheel is positioned, and the inlet end of the flash groove is positioned at the front side of the auxiliary plug.
3. The near-equal channel multi-corner continuous extrusion device of claim 1, wherein: the main plug, the auxiliary plug, the arc-shaped friction surface and the feeding chute are detachably connected with the die body.
4. The near-equal channel multi-corner continuous extrusion device of claim 3, wherein: the main plug, the auxiliary plug, the arc-shaped friction surface and the feed chute are detachably connected with the die body through a hot-inlaying method.
5. The near-equal channel multi-corner continuous extrusion device of claim 1, wherein: the discharge port is connected with a parallel flow pipe arranged along the axial direction of the confluence welding cavity.
CN201810209115.XA 2018-03-14 2018-03-14 Near-equal channel multi-corner continuous extrusion device Active CN108526236B (en)

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CN109675947A (en) * 2018-12-26 2019-04-26 湖南大学 A kind of continuous soldering pressing method of the repetition of Refining Mg Alloy crystal grain

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RU2333062C2 (en) * 2006-08-11 2008-09-10 Федеральное Государственное Унитарное Предприятие "Центральный Научно-Исследовательский Институт Конструкционных Материалов "Прометей" (Фгуп "Цнии Км "Прометей") Device for metals plastic working with angular pressing
CN102601148B (en) * 2012-03-21 2013-12-25 西北工业大学 Equal-channel corner split-flow spreading extrusion molding mould of aluminium alloy plate material
CN202701004U (en) * 2012-07-16 2013-01-30 龙泉市双振铝业有限公司 Aluminum pipe continuous extruding machine
CN203316507U (en) * 2013-06-15 2013-12-04 山东亨圆铜业有限公司 Continuous extruder for copper alloy lead
CN104174678B (en) * 2014-09-04 2016-09-07 大连康丰科技有限公司 The continuous extruder that the plane of symmetry of big of die cavity of extension is vertical with extruding wheel axis
CN105478513B (en) * 2016-01-14 2018-03-06 昆明理工大学 A kind of device for simulating Equal-channel Angular Pressing
CN107321807A (en) * 2017-08-17 2017-11-07 芜湖市海源铜业有限责任公司 A kind of efficient copper product extruder appts

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Denomination of invention: Near equal channel multi angle continuous extrusion device

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