CN105855312B - A kind of microchannel aluminium flat conduit extrusion die and preparation method thereof - Google Patents

A kind of microchannel aluminium flat conduit extrusion die and preparation method thereof Download PDF

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Publication number
CN105855312B
CN105855312B CN201610331612.8A CN201610331612A CN105855312B CN 105855312 B CN105855312 B CN 105855312B CN 201610331612 A CN201610331612 A CN 201610331612A CN 105855312 B CN105855312 B CN 105855312B
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China
Prior art keywords
rear cavity
work band
cavity
flat conduit
aluminium flat
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CN201610331612.8A
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Chinese (zh)
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CN105855312A (en
Inventor
房荣胜
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Yangzhou Rise-Al Composite Metal Material Co Ltd
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Yangzhou Rise-Al Composite Metal Material 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
    • B21C25/00Profiling tools for metal extruding
    • B21C25/02Dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02Wire-cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/14Making holes

Abstract

The invention discloses a kind of microchannel aluminium flat conduit extrusion die and preparation method thereof, microchannel aluminium flat conduit extrusion die includes work band and rear cavity, and rear cavity is bellmouth, and work band is straight hole, and rear cavity is connected to by the smaller one end in its section with work band.The work band and rear cavity of the microchannel aluminium flat conduit extrusion die are molded using linear cutter.The surface roughness of work band and rear cavity is 0.3-0.5 μm.Opposite work band, the inner wall of cavity is inclined surface afterwards, when aluminium is after extruding is from work band outflow, into in rear cavity, since the inner wall of rear cavity is an inclined surface, then after flowing into cavity the microchannel aluminium flat conduit of pre-profiling under the promotion for being squeezed power, gradually mold is skidded off always along rear cavity wall, form microchannel aluminium flat conduit product, the microchannel aluminium flat conduit for effectively preventing pre-profiling blocks in rear cavity, solve the problems, such as microchannel flat pipe mould lift one's head it is difficult this.

Description

A kind of microchannel aluminium flat conduit extrusion die and preparation method thereof
Technical field
The invention belongs to microchannel aluminium flat conduit extrusion die technical fields, and in particular to a kind of microchannel aluminium flat conduit extrusion die Tool and preparation method thereof.
Background technology
The processing of microchannel aluminium flat conduit is difficulty highest in aluminium extrusion processing, because product basal area is small, generally in 10mm2 Left and right reaches 500 times or so even if can be very high using porous extruding (such as one, which goes out four, one, goes out six) extrusion ratio, squeezes difficulty very It is high.
Existing extrusion die includes work band and rear cavity, and rear cavity is straight hole, as shown in Figure 1, 2, processing method For:Straight type hole is first cut out with wire cutting, then hole is increased with electric pulse straight, cavity after formation, electric pulse are processed again Keep the surface roughness of cavity thereafter high, about 50-100 μm.Because of microchannel aluminium flat conduit extrusion ratio aluminium that is too big, thus using Material is very soft, alloy content is seldom, and the trade mark is generally 1050,1100,3102,1197 these typess, even if using such aluminium material, Temperature when product stream goes out work band when extruding will also reach 600 DEG C or more, and the pressure being subject to due to each position of product It is all different, therefore can be advanced around after product flows out and squeezes sizing (work band) region, since 600 DEG C of temperature have been approached 660 DEG C of fusing point, after product is withstood on rear profile cavity wall, since the high product of the surface roughness of rear cavity will pause, but Subsequent product is also goed ahead, and more and more aluminiums will be caused to flock together, and is finally blocked up full entire rear cavity and is caused to block.
Invention content
The purpose of the present invention is to provide a kind of microchannel aluminium flat conduit extrusion dies and preparation method thereof, solve the prior art Middle channel aluminium flat conduit extrusion die is easy the technical issues of obstruction in extrusion process.
In order to solve the technical problem, the present invention adopts the following technical scheme that:
A kind of microchannel aluminium flat conduit extrusion die, including work band and rear cavity, the rear cavity is bellmouth, and work band For straight hole, rear cavity is connected to by the smaller one end in its section with work band.The cross section of the bellmouth is oval poroid, cone Two the angle between planes of shape hole inner wall are 12 degree.Work the central axis of band and rear cavity, and work band and rear cavity face The place of connecing seamlessly transits.The inner wall of then opposite work band, rear cavity is inclined surface, when aluminium is after extruding is from work band outflow, Into in rear cavity, since the inner wall of rear cavity is an inclined surface, and there is very high finish again, so cavity after flowing into The microchannel aluminium flat conduit of middle pre-profiling forms microchannel aluminium flat conduit by that can skid off mold under gravity always along rear cavity wall Product, the microchannel aluminium flat conduit for effectively preventing pre-profiling block in rear cavity, solve microchannel flat pipe mould and lift one's head This difficult problem.
Be further improved, the surface roughness of the work band and rear cavity is 0.3-0.5 μm, compared with prior art after Any surface finish degree of cavity is very high, and the inner wall of rear cavity is an inclined surface, then is more conducive to microchannel aluminium flat conduit edge It rear cavity wall and skids off mold.
Be further improved, the length of the work band is the 1/3-1/2 of rear profile cavity length, when rear profile cavity length too in short-term, Microchannel aluminium flat conduit insufficient strength when going out mold is yielding;When rear profile cavity length is too long, mold is too thick, is unfavorable for radiating.
A kind of preparation method of microchannel aluminium flat conduit extrusion die, includes the following steps:
Step 1: cutting out conical through-hole, cavity after formation, the cross section of conical through-hole on mold green body using wire cutting To be oval poroid, two the angle between planes of conical through-hole inner wall are 12 degree.The angle of two interplanars of conical through-hole inner wall cannot It is too big, when angle is too big during squeezing microchannel aluminium flat conduit, when microchannel aluminium flat conduit slides to rear cavity from the band that works to Lower bending degree is excessive, easily causes microchannel aluminium flat conduit deformation;But the angle of two interplanars of conical through-hole inner wall can not It is too small, when angle is too small during squeezing microchannel aluminium flat conduit, when microchannel aluminium flat conduit slides to rear cavity from work band by Frictional force to rear profile cavity wall is larger, easily causes blocking.
Step 2: cutting out straight hole using wire cutting one end smaller in rear cavity section, work band, the work band are formed It is seamlessly transitted with the place of being bordered by of the central axis of rear cavity, and work band and rear cavity.
Step 3: continuing to polish to the inner wall of rear cavity, the band that works using wire cutting method, after polishing improves Cavity, work band inner wall smoothness, prevent squeeze microchannel aluminium flat conduit when block.
Wire cutting in above-mentioned steps is slow wire feeding, and wire travelling speed is less than 0.2mm/s, and wire cutting is copper wire with wire electrode, The a diameter of 0.1mm-0.25mm of wire electrode.Because the rear profile cavity wall roughness processed with low-speed WEDM can reach 0.3-0.5 μm, very smooth, the roughness compared to electric pulse processing is more than 150 times bright and clean, when squeezing microchannel aluminium flat conduit, Convenient for microchannel aluminium flat conduit mold is skidded off along rear cavity wall.
It is further improved, the number polished in the step 3 is four times, by increase polishing number, preferably improves work Make the smoothness of band and rear profile cavity wall.
Compared with prior art, the present invention has the advantages that:
1, by being to be processed as bellmouth by rear cavity, the microchannel aluminium flat conduit of pre-profiling is effectively prevented in rear cavity Middle obstruction.
2, easy to operate using linear cutter bellmouth and work band, and the rear cavity wall processed is very smooth, Convenient for microchannel aluminium flat conduit mold is skidded off along rear cavity wall.
3, it is polished the inner wall of rear cavity, the band that works using wire cutting method, cavity, work after polishing improves The smoothness of the inner wall of band prevents from blocking when squeezing microchannel aluminium flat conduit.
Description of the drawings
Fig. 1 is the structural schematic diagram of microchannel aluminium flat conduit extrusion die in the prior art.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is structural schematic diagram when microchannel aluminium flat conduit extrusion die of the present invention squeezes production.
Fig. 4 is the structural schematic diagram for going out rear cavity using linear cutter.
Fig. 5 is the structural schematic diagram for going out rear cavity and the band that works using linear cutter.
Specific embodiment
To keep the purpose of the present invention and technical solution clearer, below in conjunction with the embodiment of the present invention to the skill of the present invention Art scheme is clearly and completely described.
Embodiment one:
As in Figure 3-5, a kind of microchannel aluminium flat conduit extrusion die, including work band 1 and rear cavity 2, the rear cavity 2 For bellmouth, work band 1 is straight hole, and rear cavity 2 is connected to by the smaller one end in its section with work band 1.Opposite work band 1, Afterwards the inner wall of cavity 2 be inclined surface, when aluminium 3 by extruding from work band 1 flow out after, into rear cavity 2, due to rear cavity 2 inner wall is an inclined surface, then after flowing into cavity pre-profiling microchannel aluminium flat conduit 4 by Gravitational sliding component and after Under the thrust of continuous product, mold is skidded off always along 2 wall of rear cavity, microchannel aluminium flat conduit product is formed, effectively prevents The microchannel aluminium flat conduit of pre-profiling is blocked in rear cavity 2, solve the problems, such as microchannel flat pipe mould lift one's head it is difficult this.At this In embodiment, the length of the work band 1 is the 1/2 of 2 length of rear cavity.
In the present embodiment, the surface roughness of the work band 1 and rear cavity 2 is 0.4 μm, compared with prior art rear profile Any surface finish degree of chamber 2 is very high, and the inner wall of rear cavity 2 is an inclined surface, then is more conducive to microchannel aluminium flat conduit edge It rear cavity wall and skids off mold.
Embodiment two:
A kind of preparation method of microchannel aluminium flat conduit extrusion die, includes the following steps:
Step 1: conical through-hole is cut out on mold green body using wire cutting, cavity 2 after formation, as shown in figure 4, taper The cross section of through-hole is oval poroid, and two the angle between planes of conical through-hole inner wall are 12 degree.
Step 2: cutting out straight hole using wire cutting one end smaller in rear cavity section, work band 1 is formed, such as Fig. 5 institutes Show, the central axis of the work band 1 and rear cavity 2, and work band 1 and the place of being bordered by of rear cavity 2 seamlessly transit;
Step 3: continuing to polish to the inner wall of rear cavity 2, the band 1 that works using wire cutting method;It is improved by polishing Afterwards cavity 2, work band 1 inner wall smoothness, prevent from blocking when squeezing microchannel aluminium flat conduit.
In the present embodiment, the wire cutting is slow wire feeding, and wire travelling speed is less than 0.18mm/s, and wire electrode is copper wire, A diameter of 0.15mm.Because the rear profile cavity wall roughness processed with low-speed WEDM only has 0.4 μm, very smooth.And The processing method of microchannel aluminium flat conduit extrusion die is in the prior art:Straight type hole is first cut out with wire cutting, then electricity consumption again Pulse is one section of increasing in straight hole, cavity after formation, keeps the surface roughness of rear cavity high using electric pulse processing, about 50-100 μm, compared with prior art, rear cavity wall roughness is more than 150 times bright and clean in the application, is squeezing microchannel aluminium flat conduit When, convenient for microchannel aluminium flat conduit mold is skidded off along rear cavity wall.
In the present embodiment, the number polished in the step 3 is four times, by increase polishing number, is preferably improved The smoothness of work band and rear profile cavity wall.
Do not done in the present invention illustrate be the prior art or can be realized by the prior art, and the present invention Described in specific implementation case be only the present invention preferable case study on implementation, practical range not for the purpose of limiting the invention. That is equivalent changes and modifications made by all contents according to scope of the present invention patent all should be used as the technology scope of the present invention.

Claims (3)

1. a kind of microchannel aluminium flat conduit extrusion die, which is characterized in that including work band and rear cavity, the rear cavity is taper Hole, work band are straight hole, and rear cavity is connected to by the smaller one end in its section with work band, the central shaft of work band and rear cavity Coaxially, and the place of being bordered by of work band and rear cavity seamlessly transits, and the cross section of the bellmouth is oval poroid, bellmouth inner wall Two the angle between planes be 12 degree;
The length of the work band is the 1/3-1/2 of rear profile cavity length;
The preparation method of above-mentioned microchannel aluminium flat conduit extrusion die, includes the following steps:
Step 1: cutting out conical through-hole on mold green body using wire cutting, the cross section of cavity after formation, conical through-hole is length Two the angle between planes of circular hole, conical through-hole inner wall are 12 degree;
Step 2: cutting out straight hole using wire cutting one end smaller in rear cavity section, work band is formed, the work band is with after The central axis of cavity, and the place of being bordered by of work band and rear cavity seamlessly transits;
Step 3: continuing to polish to the inner wall of rear cavity, the band that works using wire cutting method;
Wire cutting in above-mentioned steps is slow wire feeding, and wire travelling speed is less than 0.2mm/s, and wire cutting is copper wire, electrode with wire electrode The a diameter of 0.1mm-0.25mm of silk.
2. microchannel aluminium flat conduit extrusion die according to claim 1, which is characterized in that the work band and rear cavity Surface roughness be 0.3-0.5 μm.
3. microchannel aluminium flat conduit extrusion die according to claim 1 or 2, which is characterized in that polish in the step 3 Number be four times.
CN201610331612.8A 2016-05-18 2016-05-18 A kind of microchannel aluminium flat conduit extrusion die and preparation method thereof Active CN105855312B (en)

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CN108555053A (en) * 2018-03-30 2018-09-21 扬州瑞斯乐复合金属材料有限公司 Porous extruding microchannel flat pipe mould of one kind and preparation method thereof
CN111644481A (en) * 2020-06-04 2020-09-11 盐城工学院 Wedge-shaped pressurizing structure of inner hole of pressure die and manufacturing method thereof

Citations (3)

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CN202292285U (en) * 2011-09-30 2012-07-04 安徽宜万丰电器有限公司 Bevel protractor for die insert for WEDM-LS lathe processing
CN202479251U (en) * 2012-03-21 2012-10-10 西北工业大学 Extrusion forming die
CN204602855U (en) * 2015-03-31 2015-09-02 广州科技职业技术学院 A kind of pipe mould

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JP3091156B2 (en) * 1997-02-17 2000-09-25 住友軽金属工業株式会社 Dies for flat perforated tube extrusion
JP3763790B2 (en) * 2002-01-25 2006-04-05 有限会社矢野エンジニアリング Dies for extruding perforated tube material
JP5727801B2 (en) * 2011-01-26 2015-06-03 三菱アルミニウム株式会社 Extrusion die apparatus and extrusion processing method

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Publication number Priority date Publication date Assignee Title
CN202292285U (en) * 2011-09-30 2012-07-04 安徽宜万丰电器有限公司 Bevel protractor for die insert for WEDM-LS lathe processing
CN202479251U (en) * 2012-03-21 2012-10-10 西北工业大学 Extrusion forming die
CN204602855U (en) * 2015-03-31 2015-09-02 广州科技职业技术学院 A kind of pipe mould

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