CN108526236A - It is close to wait the more corner continuous extrusion devices in channels - Google Patents

It is close to wait the more corner continuous extrusion devices in channels Download PDF

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Publication number
CN108526236A
CN108526236A CN201810209115.XA CN201810209115A CN108526236A CN 108526236 A CN108526236 A CN 108526236A CN 201810209115 A CN201810209115 A CN 201810209115A CN 108526236 A CN108526236 A CN 108526236A
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China
Prior art keywords
plug
channels
die
friction surface
arcuate friction
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Granted
Application number
CN201810209115.XA
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Chinese (zh)
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CN108526236B (en
Inventor
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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Priority to CN201810209115.XA priority Critical patent/CN108526236B/en
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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 kind of nearly equal more corner continuous extrusion devices in channels, including extruding wheel and extrusion die, the extrusion die is provided with arcuate friction surface identical with the extruding camber of wheels, the extruding wheel outer is provided with the race being adapted to bar embryo material, the bar embryo material is extruded into the feed inlet of the extrusion die between the race and the arcuate friction surface;The cooperation that the closely equal more corner continuous extrusion devices in channels of the present invention pass through main plug and secondary plug, by bar embryo material peeling, make the crystal grain refinement after closely waiting the more corners in channels continuously extruded by shunting bridge again, it is completed by space total four corners facing each other, longer nearly equal channels and more corners increase extrusion coefficient.

Description

It is close to wait the more corner continuous extrusion devices in channels
Technical field
The present invention relates to aluminium alloy extruded field more particularly to a kind of nearly equal more corner continuous extrusion devices in channels.
Background technology
Manufacture for the parallel flow tube of heat exchanger aluminium alloy is nearly all to use traditional forward extrusion method or continuous Extrusion carries out.
The equal channel angular pressing platen press studied energetically both at home and abroad at present, the cross section in extrusion die inner outlet channel and intake channel Shape and area are identical, and two passage axis intersect at a certain angle, in extrusion process, under the action of punch pressure sample by Lower extruding, generation part is big shear-deformable at channel corner, obtains prodigious dependent variable, dislocation rearranges at this time, subgrain Divide original grain, the constantly high angling of crystal boundary, to obtain ultra-fine grain structure.
From the basic principle of continuous extrausion process it is found that because of its 90 degree of shear-deformable patterns, the continuously extruded class of radial It is similar to an inferior channel deformation, and tangential is continuously extruded is similar to two inferior channel deformations, and its die break is preferable, tissue Uniformly, crystal grain is tiny.But there are following disadvantages in continuous extrausion process at this stage:
1, for shunting forward extrusion method
Extruding is casting rod with raw material, though there is good tissue cleanliness factor, dense structure's degree is poor;Extrusion ratio is big, equipment operation It is costly;Though extrusion ratio can be reduced by being had more using a mould, productivity is improved, the dense structure of extruded product is also greatly reduced Property, to drag down product quality;Extrusion line investment is big, and equipment depreciation rate is high;The size of mold core, complex-shaped, intensity Becoming with wearability influences the major issue of die life, and die life directly affects production cost;Extrded material recovery rate Low (only 65~70%).
2, for the radially continuous extrusion of single slot
Extruding raw material uses continuous casting and rolling bar material, interior tissue to be easily mingled with, choke with resentment, and bar material surface and secondary surface layer are mingled with tandem rolling Insert, micro-crack or the pockmark of generation, more, the bar material form accuracy difference etc. of folding or even cavity;Extrusion ratio is low, goes out especially with one It is poorer than dense structure degree to shunt forward extrusion method;The quality requirement of current micro-channel parallel flow tubing products is not adapted to, just Gradually or comprehensively exit the market that parallel flow tube squeezes.
3, for the tangential continuous extrausion process of single-wheel double flute
Double rod feeding belt comes bar material surface, secondary surface layer harmful structure influences the effect of extruded product quality higher than single slot radial direction Continuous extrausion process;Mold assembly precision is poor, and the service life is low;Extruding force is big, and process costs are higher;Material recovery rate is squeezed than radial single slot Press relatively low, the radially continuous extrusion of a little higher than single slot of overall operation cost.
It causes the reason to be:
The method of diffluence combination die forward extrusion corresponds to its extrusion cylinder diameter, cast billets used generally all Φ 80mm with On;In bar surface layer, head and the mechanical removal before must all not squeezed produced with casting, to ensure harmful structure not It brings into extruded product.When forward extrusion, the pressure ram direction of motion is consistent with the discharging direction of extruded product, deformable metal with squeeze There is opposite sliding between pressure cylinder inner wall, will produce prodigious frictional resistance.On the one hand the frictional resistance keeps metal flow extremely uneven, Lead to squeeze a series of defects (head, the non-product of each casting rod extrusion will abandon) such as contracting tail, structure property be uneven, and shows Writing reduces yield rate, and on the other hand increasing extruding energy consumption, (energy consumption for having 30%~40% in actual production is this for overcoming Harmful friction), limitation extrusion speed and accelerate die wear, to influence production efficiency, increase production cost.It is general its For extrudable minimum wall thickness (MINI W.) in 0.5mm hereinafter, section appearance and size tolerance is less than ± 0.10mm, wall thickness tolerance is less than ± 0.05mm. When accurate proximate matter this kind of with conventional bridge die extrusion micro-channel parallel flow pipe, service life of mold (especially shunt bridge, mold core it is strong Degree and wearability) it is become with material flowing when squeezing to influence the principal element of its production.
Due to continuous casting and rolling aluminium alloy rod material production process structure defect, i.e., continuous casting choke with resentment be mingled with, tandem rolling harmful structure And various exotics indentation aluminium bar time surface layers are inevitable, its crizzle or pockmark in addition, folding or even cavity etc., bar material Form accuracy difference etc., for theory estimation, the continuously extruded harmful structure of upper analysis, which influences result, to be doubled;Certainly also by Aluminium material has a presence (bar material surface harmful structure can be excluded with flash) of overflow during continuously extruded, bad surface layer, secondary The extruded product quality influence of textura epidermoidea can be greatly improved;Even if in this way, the inside and outside portion of the raw material of continuous extrausion process organize it is pure Net property is not so good as the fact that conventional extrusion is also objective.
Invention content
The purpose of the present invention is that solve the above-mentioned problems and provides a kind of nearly equal more corners in channels continuously extruded dress It sets.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of nearly equal more corner continuous extrusion devices in channels, including extruding wheel and extrusion die, the extrusion die setting There are arcuate friction surface identical with the extruding camber of wheels, the extruding wheel outer to be provided with the race being adapted to bar embryo material, institute Bar embryo material is stated between the race and the arcuate friction surface, and is extruded into the feed inlet of the extrusion die;
The extrusion die includes die main body, main plug, secondary plug, shunting bridge and feed well, the arcuate friction surface It is arranged on the die main body, the feed inlet is arranged at the middle part of the arcuate friction surface, and the main plug is arranged in institute State the rear side side of feed inlet, the pair plug is arranged in the front side of the feed inlet, the die main body be internally provided with The confluence soldering chamber of the feed inlet connection, the shunting bridge is arranged in the confluence soldering intracavitary, and is located at the feed inlet Lower section, the confluence soldering intracavitary is provided with discharge port, and the feed well is arranged in the feed inlet.
Specifically, the shunting bridge is triangle block structure, and the angle of the split point of the shunting bridge is 120 °, the shunting The cross-sectional area of split channel between bridge and the medial surface of the confluence soldering chamber is sequentially increased from feed inlet to discharge port.
Preferably, the main plug is located in the race of the extruding wheel, and the lateral surface of the main plug and the wheel It is provided with gap between the medial surface of slot.
Further, flash groove, the flash groove and the plane where the extruding wheel are provided in the arcuate friction surface Vertically, and the inlet side of the flash groove is located at the front side of the secondary plug.
Specifically, the main plug, the secondary plug, the arcuate friction surface and the feed well with the mold sheet Body is detachably connected.
Preferably, the main plug, the secondary plug, the arcuate friction surface and the feed well by hot inlaying process with The die ontology is detachably connected.
Preferably, the discharge port is connected with the parallel flow tube being axially arranged along the confluence soldering chamber.
The beneficial effects of the present invention are:
The closely equal more corner continuous extrusion devices in channels of the present invention are shelled bar embryo material by the cooperation of main plug and secondary plug Skin, then made using the crystal grain refinement after closely waiting the more corners in channels continuously extruded by shunting bridge --- it is facing each other by space Total four corners are completed, and longer nearly equal channels and more corners increase extrusion coefficient.
Description of the drawings
Fig. 1 is the sectional view of the nearly equal more corner continuous extrusion devices in channels of the present invention;
Fig. 2 is the partial schematic diagram of main plug and extruding wheel of the present invention.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings:
As depicted in figs. 1 and 2, a kind of nearly equal more corner continuous extrusion devices in channels of the invention, including extruding wheel 8 and extruding Mold, extrusion die are provided with arcuate friction surface 2 identical with 8 radian of extruding wheel, and 8 outer of extruding wheel is provided with suitable with bar embryo material The race matched, bar embryo material are extruded into the feed inlet 4 of extrusion die between race and arcuate friction surface 2;
Extrusion die includes that die main body 1, main plug 3, secondary plug, shunting bridge 6 and feed well 5, arcuate friction surface 2 are arranged On die main body 1, feed inlet 4 is arranged at the middle part of arcuate friction surface 2, and main plug 3 is arranged in the rear side side of feed inlet 4, secondary Plug is arranged in the front side of feed inlet 4, and die main body 1 is internally provided with the confluence soldering chamber being connected to feed inlet 4, shunts bridge 6 settings are in confluence soldering intracavitary, and positioned at the lower section of feed inlet 4, and confluence soldering intracavitary is provided with discharge port 7, and feed well 5 is arranged In feed inlet 4, main plug 3 is located in the race of extruding wheel 8, and is set between the lateral surface of main plug 3 and the medial surface of race It is equipped with gap 9, flash groove is provided in arcuate friction surface 2, flash groove is vertical with the plane where extruding wheel 8, and flash groove Inlet side is located at the front side of secondary plug, and shunting bridge 6 is triangle block structure, and the angle for shunting the split point of bridge 6 is 120 °, shunts bridge The cross-sectional area of split channel between 6 and the medial surface for the soldering chamber that converges is sequentially increased from feed inlet 4 to discharge port 7.
Main plug 3, secondary plug, arcuate friction surface 2 and feed well 5 are detachably connected with die ontology, main plug 3, pair Plug, arcuate friction surface 2 and feed well 5 are detachably connected by hot inlaying process and die ontology.
The operation principle of the closely equal more corner continuous extrusion devices in channels of the present invention is as follows:
It is to use raw strip in the continuous casting and rolling aluminium alloy rod material or the continuously extruded of horizontal casting bar material of existing maturation first Under part;Then the originally oil-free that reality and horizontal casting bar material are produced according to the non-oil ultra high vacuum system of current continuous casting and rolling aluminium alloy rod connects Casting process abandons the bar material chemical cleaning technology method in continuous squeezing method, and uses wet blasting process to aluminium alloy rod material table Face carries out mechanical chipping;Final practical experience and theory according to during the long-term parallel flow tube of tangential continuous extrusion production is ground Study carefully, around the production of ultrahigh quality micro-channel parallel flow pipe and other high-accuracy soldering class extruded products:
1, the online peeling technology in extrusion process.By continuously extruded principle, matching between main plug 3 and extruding wheel 8 It closes, has actually constituted certain three faces peeling function of aluminium alloy rod material, the secondary plug of suitable position arrangement before feed well 5 is main stifled First 3 cooperatively form four sides peeling function with secondary plug, to reach the complete online peeling effect of aluminium alloy rod material.
2, the replaceable main plug 3 of extrusion die, secondary plug, arcuate friction surface 2 and feed well 5, arcuate friction surface 2, into The abrasion of hopper 5, main plug 3 and secondary plug can all cause flow velocity, pressure oscillation and the variation of soldering intracavitary and influence to squeeze matter Amount;The technology of replaceable assembly ensure that the production of extruded product high-quality stabilization for a long time, die cavity ontology can longer-term using simultaneously It reduces and squeezes tool and mould consumption.
3, by etc. the principles of the more corners in channels organically combined with the continuously extruded principle of tangential, and it is tangential with single slot Continuously extruded mode arranged in die cavity preferably space total four corners facing each other, adapt to squeeze require it is close etc. logical Road structure design reaches and obtains uniform, tiny aluminium alloy crystal grain group in the case of not breaking through continuous extrausion process maximum extrusion ratio It knits and the second phase of Dispersed precipitate.
It is specially:
1, online peeling
Continuously extruded process can be visually interpreted as:Bar blank itself is both the material and pressure ram being extruded.Into The bar blank for entering 8 slot leading portion of extruding wheel travels forward under the action of frictional force, and since temperature is relatively low at this time, blank itself has Enough intensity, it is believed that be " pressure ram ";In 8 slot back segment of extruding wheel it is had reached since friction effect elevates the temperature Forming temperature, it is believed that be " blank ", it is continuously squeezed out from die orifice under the driving of leading portion " pressure ram ".In stable production Cheng Zhong, leading portion " pressure ram " are constantly converted to " blank " of back segment, and front and back two sections " handing-over " position remains unchanged.
Since blank is just full of deformation space, the required temperature of Plastic Flow is had not yet been reached, blank is from extruding wheel 8 and mould Gap (working clearance) extrusion resistance between chamber is larger, deformation space closing is equivalent to, so pressure drastically increases.Pressure liter While high, frictional force is made to increase, driving force is effectively squeezed to further improve.On the other hand, temperature also continues to increase, Condition is improved for subsequent deformation.
Due to having relative motion between extruding wheel 8 and extrusion die, it is necessary to stay the gap there are one very little, ensure the two Between do not contact generation abrasion.It is also the current by pass of major and minor plug and its surface harmful structure after the effect of bar material simultaneously --- because It to be first filled with the gap for surface layer, this surface layer of bar material, thus also just completes the complete online stripping of the bars material such as continuous casting and rolling Skin.
2, the replaceable main plug 3 of extrusion die, secondary plug, arcuate friction surface 2 and feed well 5,
To be squeezed into caused by main plug 3, secondary plug, feed well 5 and arcuate friction surface 2 are worn in solution actual production Expect the variation of section speed, generates outside extruded product quality fluctuation, continuous decrease etc., the increase of overflow is also these key functions The certainty of structural wear has just expedited the emergence of replaceable easy to ensure that the stabilization of extruding quality is not necessary to replace the die cavity of entire costliness again The appearance for damaging the built up cavity of key component, is combined using ripe hot insert method with die cavity ontology, it is convenient to ensure cooperation essence Degree.
3, the more corners in channels such as close are continuously extruded
Usually, using etc. the more corner extrusions in channels completed as a continuous process, we can be referred to as to wait logical The more corners in road are continuously extruded.But corner is more, and extruding force is bigger, and the possibility for producing realization the impossible, therefore really meaning The equal more corners in channels of justice are continuously extruded existing also to rest on theory and discrete equal more corner extrusions in channels in laboratory are tested The outcome research continuously to get up on.
For this purpose, it is proposed that the concept of " close to wait the more corners in channels continuously extruded ".That is, closely waiting the more corners in channels continuously extruded Concept depend on continuously extruded (CONFORM methods), according to usage and with maximum possible reduce extruding force design concept, the method Metal flow channel is subcircular and becomes larger that thus equal channels are converted into " approximation " --- closely wait channels;It is no matter radial Or tangential continuously extruded, the process for the feed inlet 4 that metal flows to extrusion die by the effect of main plug 3 is really to carry out 90 degree of corner --- equal channel angular;Directly go out tangential continuously extruded (CONKLAD unlike die orifice from radial compression metal Method) 90 degree of corners having been carried out again in die cavity under primary big channel of process metal stream just directly go out die orifice.
Pressing material in the race of the extruding wheel 8 in equal channels is through arcuate friction surface 2, under the blocking of main plug 3, bar embryo material Enter through feed inlet 4 through nearly 90 degree of corner and become larger the split channel for promoting stream, the aluminium material being divided into two enters bigger channel Confluence soldering chamber in, the aluminium flow direction in aluminium stream direction and split channel in the soldering chamber that converges at this time is in times within the scope of 360 degree What angle distribution, and all spatial vertical 8 groove aluminium stream directions of extruding wheel during corner;Through confluence soldering chamber press after its The aluminium material of any angle distribution within the scope of 360 degree is squeezed out again through nearly 90 degree of corner by the soldering class mold such as parallel flow tube Product.
In Fig. 1, enter the aluminium stream for shunting main channel under the action of shunting bridge 6 through 90 degree of left and right rotation angles for the first time, aluminium It flows through 120 degree of left and right rotation angles and is divided into the symmetrically two strands of aluminium streams in left and right, i.e., close equal channel angular process;Then two strands of aluminium streams are controlled again Corresponding with corner and antipodal nearly Equal-channel Angular Pressing is carried out, aluminium stream enters after this closely equal secondary corner in channels Confluence soldering intracavitary is pressed.
In this way, this closely waits the continuously extruded patented technology of the more corners in channels in such a way that single slot is tangentially continuously extruded, in die cavity In arrange space total four corners facing each other that the more corner extrusions in the channels such as tradition are pursued.
Technical scheme of the present invention is not limited to the limitation of above-mentioned specific embodiment, every to do according to the technique and scheme of the present invention The technology deformation gone out, each falls within protection scope of the present invention.

Claims (7)

1. a kind of nearly equal more corner continuous extrusion devices in channels, it is characterised in that:Including extruding wheel and extrusion die, the extruding Mold is provided with arcuate friction surface identical with the extruding camber of wheels, and the extruding wheel outer is provided with to be adapted to bar embryo material Race, the bar embryo material are extruded into the charging of the extrusion die between the race and the arcuate friction surface Mouthful;
The extrusion die includes die main body, main plug, secondary plug, shunting bridge and feed well, the arcuate friction surface setting On the die main body, the feed inlet is arranged at the middle part of the arcuate friction surface, the main plug setting it is described into The rear side side of material mouth, it is described pair plug be arranged in the front side of the feed inlet, the die main body be internally provided with it is described The confluence soldering chamber of feed inlet connection, the shunting bridge are arranged in the confluence soldering intracavitary, and under the feed inlet Side, the confluence soldering intracavitary are provided with discharge port, and the feed well is arranged in the feed inlet.
2. the nearly equal more corner continuous extrusion devices in channels according to claim 1, it is characterised in that:The shunting bridge is three The angle of split point of hornblock structure, the shunting bridge is 120 °, the medial surface of the shunting bridge and the confluence soldering chamber it Between the cross-sectional area of split channel be sequentially increased from feed inlet to discharge port.
3. the nearly equal more corner continuous extrusion devices in channels according to claim 1, it is characterised in that:The main plug is located at In the race of the extruding wheel, and gap is provided between the lateral surface and the medial surface of the race of the main plug.
4. the nearly equal more corner continuous extrusion devices in channels according to claim 3, it is characterised in that:The arcuate friction surface On be provided with flash groove, the flash groove is vertical with the plane where the extruding wheel, and the inlet side of the flash groove is located at institute At the front side for stating secondary plug.
5. the nearly equal more corner continuous extrusion devices in channels according to claim 1, it is characterised in that:The main plug, institute Secondary plug, the arcuate friction surface and the feed well is stated to be detachably connected with the die ontology.
6. the nearly equal more corner continuous extrusion devices in channels according to claim 5, it is characterised in that:The main plug, institute Secondary plug, the arcuate friction surface and the feed well is stated to be detachably connected by hot inlaying process and the die ontology.
7. the nearly equal more corner continuous extrusion devices in channels according to claim 1, it is characterised in that:The discharge port connection There is the parallel flow tube being axially arranged along the confluence soldering chamber.
CN201810209115.XA 2018-03-14 2018-03-14 Near-equal channel multi-corner continuous extrusion device Active CN108526236B (en)

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Publication number Priority date Publication date Assignee Title
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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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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