CN100469472C - Semi-solid multi-blank extruding process and apparatus for forming double-layer composite pipe - Google Patents
Semi-solid multi-blank extruding process and apparatus for forming double-layer composite pipe Download PDFInfo
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- CN100469472C CN100469472C CNB2007100644545A CN200710064454A CN100469472C CN 100469472 C CN100469472 C CN 100469472C CN B2007100644545 A CNB2007100644545 A CN B2007100644545A CN 200710064454 A CN200710064454 A CN 200710064454A CN 100469472 C CN100469472 C CN 100469472C
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Abstract
The present invention relates to semi-solid forming technology, and is especially semi-solid multi-blank extruding process and apparatus for forming double-layer composite pipe. The technological process includes the following steps: pre-heating the mold to 200-300 deg.c and establishing temperature control system, setting the induction heated blank into the extruding mold, and extruding at regulated speed and stroke to obtain the required composite pipe. The new extruding process for making composite pipe has short procedure, low power consumption and high product quality.
Description
Technical field
The present invention relates to a kind of double-layer composite pipe semi-solid multi-blank extrusion forming process and device thereof, belong to the semi-solid state forming technique field.
Background technology
The processing and manufacturing of double-layer composite pipe is a kind of advanced forming technique that grew up in recent years, and it is mainly used in fields such as electronic apparatus, automobile, building materials, HVAC and Aero-Space.PAP is to adopt the butt welding explained hereafter to form in the market, and stainless steel composite pipe is that carbon element steel band and stainless steel band adopt the method that coats production to make.In fact, the multiple tube of producing with these two kinds of technology has very obvious defects: be connected with the slit between inner tube and the outer tube.To intensity be connected with the field such as the aerospace field of high requirement, these slits can constitute fatal threat to aircraft security, because the air at high temperature in the slit can expanded by heating made the multiple tube distortion and damage.In addition, produce this multiple tube and need two work steps at least: the first step is to produce the mono-layer tube of homogeneous material respectively; Second step was that the mono-layer tube that the method for employing coating or welding is produced the first step carries out compound connection.Obviously, this explained hereafter cycle is long, energy consumption is high, can not realize once-forming.Therefore how to find a kind of ingenious method that can realize that short flow process, near-net-shape can guarantee that again the multiple tube of producing has a good switching performance to be one and have creative and challenging invention work.
On the other hand, in the medium-term and long-term development plan of national Eleventh Five-Year Plan, clearly propose following processing industry and must walk low energy consumption, oligosaprobic road, and proposed corresponding performance assessment criteria.Be high energy consumption, heavily contaminated and the low cost performance of reversing the materials processing industry of in China's economic construction, occupying critical role as early as possible, improve the quality of products, alleviate environmental pollution, strengthen its international competitiveness, press for from metallurgical material scientific development forward position, break through traditional metallurgy and processing technology theory and notion, utilize new and high technology that new technology exploration is carried out in materials processing and control technology, realize short flow process, low energy consumption and the high-quality of production process.Explore the short flow process of multi-layered composite pipe, nearly end form production method for a long time, and can become a kind of the pressing for of vast modern high technology processing enterprise from experimentally preparing multi-layered composite pipe.The appearance of phase early 1970s semi-solid processing has brought hope for undoubtedly the multiple tube of producing high quality of connection.
So-called semi-solid processing is that the solid-liquid mixed slurry with certain liquid phase component is carried out die casting, extruding or die-forging forming, be a kind of manufacturing process (M.C.Flemings.Behavior of Alloys in Semi-solid State.Metallurgical Transactions between conventional cast (pure liquid state) and forging and pressing (pure solid-state), 1990, Vol.22B:269-293).Compare with common processing method, semi-solid-state metal processing has following advantage: 1. have wide range of applications, all metal and alloys with solid-liquid two-phase region all can be realized semi-solid processing, as die casting, extruding and the excellent suitability for press forming of aluminium alloy, magnesium alloy and steel; 2. semi-solid alloy partly discharges crystallization latent heat, thereby has alleviated the thermal shock to processing mold, and its life-span is increased substantially; 3. semi solid slurry has rheological characteristic and thixotropy, and resistance of deformation is very little, thereby the very complicated parts of section that can be shaped, and realizes near-net-shape, and has shortened the process-cycle, has improved stock utilization, helps energy-saving material-saving; 4. the semi solid slurry filling is steady, no turbulent flow and splash, and processing temperature is relatively low, and solidification shrinkage is little, thereby the drip molding surfacing is smooth, dense internal organization, defectives such as pore, segregation are few, and crystal grain is tiny, and mechanical property is good.As seen semi-solid processing is compared with traditional process technology and is had great advantage (Simon Kleiner, ErhardOgris, Oliver Beffort and Peter J.Uggowitzer.Semi-Solid Metal Processing of AluminumAlloy A356 and Magnesium Alloy AZ91:Comparison Based on Metallurgical Considerations.Advanced Engi.Mater.2003,5 (9): 653-658).
Since the seventies in 20th century, this technology has obtained the U.S., Italy, the scientific workers' of developed country such as Germany and Japan generally attention, and successively to aluminium, magnesium, plumbous, alloys such as copper have been carried out extensive studies at aspects such as semisolid technological experiment and theories, obtained impressive progress, part company has entered large-scale production (M.Fehlbier.Herstellung, Charakterisierung und Verarbeitung Teilfluessiger Metallischer Werkstoffe am BeispielVerschiedener Aluminum-und Magnesiumlegierungen.Aachen, Techn.Hochsch., Diss, 2002.ISBN 3-8322-1064-4).Production capacity as two semi-solid aluminium alloy shaping auto parts production plants in 1997 of Alumax company of the U.S. reaches annual 5000 ten thousand respectively.The semi-solid aluminium alloy auto parts quality that gondola Stampal SPA and Fiat Auto company produce reaches 7kg, and complex-shaped; Gondola MM (MagnetiMarelli) produced the fuel injection rail part that semi-solid aluminium alloy is shaped for motor corporation, reached 7500 of daily outputs in 2000.In Germany, metal forming institute of world-renowned RWTH (IBF der RWTH-Aachen) just carrying out under president Gerhalt professor Hirt leads before Reiner Kopp professor and EFU company one large-scale, the semisolid research project SFB289 (Sonderforschungbereich) that level is very high, this project continuous 12 years from 1996 obtains subsidy from the German scientific research DFG of federation (Deutsche Forschungsgemeinschaft), semisolid has been carried out comprehensively, deeply and the basic research and the commercial development (M.Kiuchi of system, R.Kopp.Mushy/Semi-solid metal forming technology-Present and future.Annals of the CIRP.2002,51 (2): 1-18).The Speed Star Wheel company of Japan produces aluminium alloy wheel hub (heavy 5kg) with semi-solid processing.In addition, produce mobile communication phone shell and notebook computer casing etc. with semi-solid magnesium alloy thixotropic forming technology in some companies of Japan.In worldwide, successively hold 9 international academic conferences (S2P) of semisolid, obtained important academy's successes.
China is since the later stage eighties, in state natural sciences fund, under the support of plans such as 863 and 973, successively there are many colleges and universities and R﹠D institution to carry out the research of this respect, as (the Zhang Jingxin of Beijing Non-Ferrous Metal Research General Academy, Zhang Kui, Xu Jun, Shi Li opens second semisolid nd Annual Meeting collection of .Semi-solid Processing of AZ91D Alloy. China. Beijing, 2002:204-208), (the Zuo Hongzhi of University Of Chongqing, Liu Changming, Zou Maohua, Gu Zhongming, model increases, Li Dequan, Wu Jun, the semisolid casting forming of the auspicious .ZL112Y pack alloy of Qiu's filial piety semisolid remelting technology and motorcycle parts. second semisolid nd Annual Meeting collection of China. Beijing, 2002:102-109) etc.Obtaining encouraging progress aspect the fundamental research of semi-solid processing forming technique, and idiomorphism design and developed dissimilar testing equipments, even test production with business tie-up.JH70 type motor generator magnesium alloy semi solid state support as University Of Chongqing and Chongqing nine sides of China Jialing group casting Co., Ltd cooperation research and development; The Beijing Non-Ferrous Metal Research General Academy cooperates with the Dong Feng Auto Corporation, the aluminium alloy automobile air-conditioner part that adopts semisolid die casting to produce.
By finding to above researching and analysing both at home and abroad, the domestic and international research of doing at present all is to adopt commaterial to carry out semisolid product development research, yet continuous development along with industries such as automobile, electronic apparatus, household electrical appliances, HVACs, demand to multiple tube increasing (as copper aluminum composite pipes), and more and more higher to its quality requirement, quality of connection particularly.PAP and stainless steel composite pipe mainly adopt butt welding technology and coat production method and make in the market, have more serious quality of connection problem.
As the extension and the development of semi-solid state forming technique, double-layer composite pipe semisolid preparation method is a kind of brand-new composite formed processing method fully.Its most important character is that forming process and connection procedure are once finished.The multiple tube that comprises two kinds of forms as copper aluminium double-layer composite pipe: copper cladding aluminium pipe and aluminum-cladding copper pipe.Wherein, the copper cover aluminum bimetallic tube of being produced through forming the double-deck copper cladding aluminium pipe lead of plurality of specifications after multi-pass stretching and the wire drawing, is directly used in the production of cable again, and this has saved the use amount of copper greatly; And the aluminum-cladding copper pipe of being produced can be used for various caliducts.In fact, the research field that double-layer composite pipe semi-solid multi-blank extrusion forming process relates to comprises a plurality of interdisciplinary research, as the thermodynamics in the material forming process, fluid dynamic theory, heat energy control technology, physics, and metallurgical material, functional gradient composite materials, solidification theory, Surface Engineering, friction techniques, pottery, the compound connection new technology of material, mould designing technique, extrusion molding precision Control Technology, analogue technique etc.In the world, the exploratory development to double-layer composite pipe semi-solid multi-blank extrusion molding does not also start to walk; At home, do not find the relevant report of double-layer composite pipe semi-solid multi-blank extrusion molding as yet.
Summary of the invention
The objective of the invention is to propose a kind of brand-new double-layer composite pipe semi-solid multi-blank extrusion forming process and device thereof fully.
The double-layer composite pipe semi-solid multi-blank extrusion forming process that the present invention proposes is characterized in that described processing step is:
(1) preparation of semi-solid blank
(a) for the Semi-Solid Thixoforming extrusion molding, the blank that will have the microstructure of semisolid feature earlier is processed into bar-shaped and ring-type with machining process respectively, use induction heater heating becomes blank to have the bar-shaped and ring-type semi-solid blank of certain fraction solid (70%-90%);
(b) for the semi-solid rheological extrusion molding, the block commercial cast metals (, needing to use argon gas) that adopts the resistance furnace heating to handle earlier as protective gas to magnesium alloy materials through super-dry, after reaching complete fusion temperature, insulation was left standstill 30 minutes.Design and turned blank prepare mould, pouring the semi solid slurry after leaving standstill into different blanks respectively prepares in the mould, apply weak stirring during this time, after being cooled to certain semi-solid temperature, obtain the bar-shaped and ring-type semi-solid blank of corresponding fraction solid (70%-90%) respectively.
(2) double-layer composite pipe semisolid extrusion molding
Design and processing are used for the mould of extrusion molding double-layer composite pipe, comprise the foundation of mould and die preheating and temperature control system.To put into the inside and outside recipient of extrusion die rapidly by the bar-shaped and ring-type semi-solid blank that eddy-current heating or semi solid slurry prepare with certain fraction solid (70%-90%).The speed of adjusting forcing press and stroke etc., extrusion molding obtains the target multiple tube.
In above-mentioned technology, when described step (1) is magnesium alloy materials when the commercial cast metals of bulk, use argon gas as protective gas.
In above-mentioned technology, described step (2) mold preheating temperature is 200 ℃-300 ℃, uses graphite powder or JD-800 type releasing agent.
In above-mentioned technology, described step (2) extrusion speed is controlled at 50-80mm/s.
The double-layer composite pipe semi-solid multi-blank extrusion molding apparatus that the present invention proposes is characterized in that described device contains:
Outer pressure ram (1), interior pressure ram (2), interior recipient (3), outer recipient (4), ring-type semi-solid blank (5), bar-shaped semi-solid blank (6), heating collar (7), shaping guide plate (8), plug (9), double-layer composite pipe (10), mould hold-down screw (11), Extruding die (12), knock-pin (13), workbench (14);
Described outer pressure ram (1) and interior pressure ram (2) are separately fixed on the outside slide block and inner slide block of double action press, and it can be moved up and down with slide block;
Place ring-type semi-solid blank (5) in described between recipient (3) and the outer recipient (4), described at the inner bar-shaped semi-solid blank (6) of placing of interior recipient (3);
The outer setting heating collar (7) of described outer recipient (4) is so that preheated mold makes shaping dies remain on about 280 ℃ in the semi-solid multi-blank extrusion process;
Described inside in shaping guide plate (8), bar-shaped and ring-type semi-solid blank (6) and (5) flow downward continuously under the effect of inside and outside pressure ram (2) and (1) and meet at the following portion of shaping guide plate (8), form interior pipe by plug (9), form the multiple tube outer surface by Extruding die (12);
Described (10) double-layer composite pipe for being shaped by the semi-solid multi-blank pressing method, it is positioned between plug (9) and the Extruding die (12);
Described (11) are the screw of fixed mould, make between inner tube and the outer tube closely to connect;
Described double-layer composite pipe (10) moves upward by knock-pin (13) and is ejected, and the controlled movement of described knock-pin (13) is in the following hydraulic cylinder of double action press.
Process that the present invention proposes and device have been opened up a new way for manufacturing double-layer composite pipe, not only can realize the shaping manufacturing of the short flow process of its production process, nearly end form, and can reduce energy resource consumption, improve the quality of products.Simultaneously, production equipment of the present invention is simple, the cost less investment.In a word, the present invention is advanced on technology, innovates on method.
Description of drawings
Fig. 1 is the mould installation diagram of double-layer composite pipe semi-solid multi-blank extrusion forming process of the present invention.
Fig. 2 is a double-layer composite pipe semi-solid multi-blank extrusion forming process flow chart of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described further:
As shown in Figure 1,1-outer pressure ram; 2-interior pressure ram; 3-interior recipient; 4-outer recipient; 5-ring-type semi-solid blank; 6-bar-shaped semi-solid blank; 7-heating collar; 8-shaping guide plate; 9-plug; 10-double-layer composite pipe; 11-mould hold-down screw; 12-Extruding die; 13-knock-pin; 14-workbench.
The annexation of each part in figure-1 mould installation diagram: outer pressure ram 1 and interior pressure ram 2 are separately fixed on the outside slide block and inner slide block of double action press, and it can be moved up and down with slide block.Place ring-type semi-solid blank 5 between interior recipient 3 and the outer recipient 4, at the interior recipient 3 inner bar-shaped semi-solid blanks 6 of placing with certain fraction solid with certain fraction solid.The external heat circle 7 of outer recipient 4 is for preheated mold, and shaping dies is remained on about 280 ℃ in the semi-solid multi-blank extrusion process.In the inside of shaping guide plate 8, the bar-shaped following portion that flows downward continuously under the effect of inside and outside pressure ram 2 and 1 with ring-type semi-solid blank 6 and 5 and meet at shaping guide plate 8 forms interior pipe by plug 9, forms the multiple tube outer surfaces by Extruding die 12.10 are the double-layer composite pipe by the shaping of semi-solid multi-blank pressing method among the figure.11 is screws of fixed mould among the figure.Because double-layer composite pipe is to embark on journey under semi-solid temperature, so the connection between inner tube and the outer tube is that semisolid connects, and is very tight.After extrusion molding was finished, double-layer composite pipe moved upward by knock-pin 13 and is ejected.The controlled movement of knock-pin 13 is in the following hydraulic cylinder of double action press.
Below technical step of the present invention be:
The preparation of semi-solid blank
(1) preparation composition, tissue and performance evenly and the tiny semi-solid blank of particle rounding be the prerequisite of multi-blank extrusion molding double-layer composite pipe.For the Semi-Solid Thixoforming extrusion molding, the blank that will have the microstructure of semisolid feature earlier is processed into bar-shaped and ring-type with machining process respectively, use induction heater heating becomes blank to have the bar-shaped and ring-type semi-solid blank of certain fraction solid (70%-90%).Because heat energy parameters such as the thermal conductivity of material, thermal capacitance and coefficient of heat transfer have determined it to add thermal effect to a great extent in the eddy-current heating process, and different materials has different heat energy parameters, therefore to guarantee that the multi-blank extrusion molding carries out smoothly, the different semi-solid blanks that are used for the ectonexine pipe will guarantee the semi-solid blank after these two kinds of heating could be put into the extrusion die extrusion molding with anchor clamps respectively simultaneously fast like this through reaching its best semisolid extrusion temperature simultaneously after the heating.
(2) for the semi-solid rheological extrusion molding, the block commercial cast metals (, needing to use argon gas) that adopts the resistance furnace heating to handle earlier as protective gas to magnesium alloy materials through super-dry, after reaching complete fusion temperature, insulation was left standstill 30 minutes.Design and turned blank prepare mould, pouring the semi solid slurry after leaving standstill into different blanks respectively prepares in the mould, apply weak stirring during this time, after being cooled to certain semi-solid temperature, obtain the bar-shaped and ring-type semi-solid blank of corresponding fraction solid (70%-90%) respectively.
Double-layer composite pipe semisolid extrusion molding
Design and processing are used for mould one cover of extrusion molding double-layer composite pipe, comprise the foundation of mould and die preheating and temperature control system.Mold preheating temperature is 200 ℃-300 ℃, uses graphite powder or JD-800 type releasing agent.To put into recipient inside and outside the extrusion die rapidly by have the bar-shaped of certain fraction solid and ring-type extrusion billet that eddy-current heating or semi solid slurry prepare.Regulate speed, the stroke of forcing press, extrusion molding obtains the target multiple tube.Extrusion speed is controlled at 50-80mm/s.The mould installation diagram is seen the figure-1 in the accompanying drawing.
Technical scheme and steps necessary:
Homogeneity or heterogeneous blank with microstructure of semisolid feature; be processed to bar-shaped and annular blank at first respectively; be heated to the semi-solid temperature interval of setting (to magnesium alloy materials with two induction heaters respectively; use argon gas as protective gas); note controlling heat time heating time, make two kinds of blanks reach their optimum semisolid extrusion molding temperature simultaneously.For the rheology extrusion molding, do not need the secondary eddy-current heating.Design also processing is used for mould one cover of double-layer composite pipe extrusion molding, with eddy-current heating or semi solid slurry prepare have the bar-shaped of certain solid rate and the ring-type semi-solid blank is directly put into extrusion die.Regulate speed (50-80mm/s), the mold preheating temperature (250-300 ℃) of forcing press and use releasing agents such as graphite powder or JD-800 type, extrusion molding obtains the target multiple tube.Process chart is seen figure-2 in the description of drawings.
Essential features:
(1) be used for the semi-solid blank preparation of double-layer composite pipe multi-blank extrusion molding, a kind of is bar-shaped blank, and another kind is an annular blank.
(2) because the heat energy parameters such as thermal conductivity, thermal capacitance and coefficient of heat transfer of material have determined it to add thermal effect to a great extent in the eddy-current heating process, and different materials has different heat energy parameters, therefore to guarantee that the multi-blank extrusion molding carries out smoothly, the difformity semi-solid blank that is used for the ectonexine pipe will guarantee the semi-solid blank after these two kinds of heating could be put into the extrusion die extrusion molding with anchor clamps respectively simultaneously fast like this through reaching its best semisolid extrusion temperature simultaneously after the heating.Therefore to will coordinating and optimize heat time heating time and heating power etc.
(3) when the internal diameter of double-layer composite pipe inner tube is reduced into zero, at this moment multiple tube deteriorates to the lead of outer bag internal layer, as in the market copper-clad aluminum conductor and silver-colored alclad line etc.Therefore double-layer composite pipe multi-blank extrusion forming process is equally applicable to the production of copper-clad aluminum conductor and silver-colored alclad line.
(4) double-layer composite pipe multi-blank extrusion forming process comprises thixotroping extrusion forming process and rheology extrusion forming process.The ectonexine tube material can be non-ferrous metal and alloy, ferrous metal and alloy, composite etc.
Non-essential technical characterictic:
In the semi solid slurry preparation process, can use induction heater, also can use resistance-heated furnace.
Same as the prior art/the difference part:
PAP is to adopt the butt welding explained hereafter to form in the market, and stainless steel composite pipe is that carbon element steel band and stainless steel band adopt the method that coats production to make.In fact, the multiple tube of producing with these two kinds of technology has very obvious defects: be connected with the slit between inner tube and the outer tube.In addition, produce this multiple tube and need two work steps at least: the first step is to produce the mono-layer tube of homogeneous material respectively; Second step was that the mono-layer tube that the method for employing coating or welding is produced the first step carries out compound connection.Obviously, this explained hereafter cycle is long, energy consumption is high, can not realize once-forming.And adopt the semi-solid multi-blank extrusion forming process to carry out the production of multiple tube, not only have good switching performance between the ectonexine pipe, technological process simultaneously is short, production efficiency is high, the ectonexine pipe with and compound connection once finish.
The present invention has the multiple tube production of good switching performance with the semi-solid multi-blank extrusion forming process, has enlarged the application of semi-soild-state technology, has expanded the manufacturing approach of multiple tube, is a kind of brand-new extrusion forming process of finishing.Use this technology, not only can realize the short flow process of multiple tube, the shaping manufacturing of nearly end form, and can reduce energy resource consumption, improve the quality of products, and advance the practicalization of semi-solid state forming technique.Simultaneously, patented method advanced person of the present invention, process innovation.
Because ripe to the semi-solid-state shaping research of A356 aluminium alloy and AZ91 magnesium alloy both at home and abroad at present, their semi-solid-state shaping temperature are also definite substantially.Therefore, existing is the production process of example explanation magnalium multiple tube with semisolid extrusion molding A356 aluminium alloy and AZ91 magnesium alloy, adopts Semi-Solid Thixoforming method extrusion molding.Case of internal is the AZ91 magnesium alloy, and the outside is the A356 aluminium alloy, and inner tube and outer tube wall thickness are 3mm, and inner caliber is 4mm.These the two kinds raw material that are used for semi-solid-state shaping can be bought from Duralcan company (Duralcan company), and outer annular A356 aluminum alloy blank can be obtained by machining process.Use two induction heater rapid and uniform heating ring-type A356 aluminum alloy blanks and bar-shaped AZ91 magnesium alloy blank respectively, will use argon gas when wherein heating the AZ91 magnesium alloy as protective gas.Because the AZ91 magnesium alloy has relatively low thermal capacitance, the time ratio A356 aluminium alloy of eddy-current heating will be lacked 20-40 about second, therefore restarting another induction heater after second at A356 aluminium alloy ring-type blank heating 20-40 heats bar-shaped AZ91 magnesium alloy blank, can guarantee that like this two kinds of blanks are heated to its best semisolid extrusion temperature simultaneously.The semi-solid temperature interval of A356 aluminium alloy optimum extrusion molding: 577 ℃-581 ℃, the semi-solid temperature interval of AZ91 magnesium alloy optimum extrusion molding: 579 ℃-584 ℃.Two kinds of difformity semi-solid blanks that have certain solid rate after the heating are put into extrusion molding in the extrusion die with anchor clamps rapidly, notice that bar-shaped AZ91 magnesium alloy is placed on interior recipient 3 inside among Fig. 1.The speed of adjusting forcing press is that 80mm/s, mold preheating temperature are 280 ℃, use the graphite releasing agent, and it is that A356 aluminium alloy, inner tube are the double-layer composite pipe of AZ91 magnesium alloy that extrusion molding obtains outer tube.After extrusion molding was finished, inside and outside pressure ram was upwards return with top shoe, and multiple tube is ejected by knock-pin among Fig. 1 13.
Claims (5)
1, double-layer composite pipe semi-solid multi-blank extrusion forming process is characterized in that, described processing step is:
The preparation of step (1) semi-solid blank
(a) for the Semi-Solid Thixoforming extrusion molding, the blank that will have the microstructure of semisolid feature earlier is processed into bar-shaped and ring-type with machining process respectively, the heating of use induction heater, blank is become having fraction solid is the bar-shaped of 70%-90% and ring-type semi-solid blank;
(b) for the semi-solid rheological extrusion molding, the block commercial cast metals that adopts the resistance furnace heating to handle earlier through super-dry, after reaching complete fusion temperature, insulation was left standstill 30 minutes; Design and turned blank prepare mould, pouring the semi solid slurry after leaving standstill into different blanks respectively prepares in the mould, apply weak stirring during this time, after being cooled to semi-solid temperature, obtaining corresponding fraction solid respectively is the bar-shaped of 70%-90% and ring-type semi-solid blank;
Step (2) double-layer composite pipe semisolid extrusion molding
Design and processing double-layer multiple tube semi-solid multi-blank extrusion molding apparatus, comprise the foundation of extrusion molding apparatus preheating of double-layer composite pipe semi-solid multi-blank and temperature control system, the fraction solid that has that will be prepared by eddy-current heating or semi solid slurry is that the bar-shaped of 70%-90% and ring-type semi-solid blank are put into recipient inside and outside the double-layer composite pipe semi-solid multi-blank extrusion molding apparatus rapidly, regulate the speed and the stroke of forcing press, extrusion molding obtains the target multiple tube.
2, according to the described technology of claim 1, it is characterized in that: (b) step in the described step (1) uses argon gas as protective gas when block commercial cast metals is magnesium alloy materials.
3, according to the described technology of claim 1, it is characterized in that: described step (2) double-layer composite pipe semi-solid multi-blank extrusion molding apparatus preheat temperature is 200 ℃-300 ℃, uses graphite powder or JD-800 type releasing agent.
4, according to the described technology of claim 1, it is characterized in that: described step (2) extrusion speed is controlled at 50-80mm/s.
5, double-layer composite pipe semi-solid multi-blank extrusion molding apparatus is characterized in that, described device contains:
Outer pressure ram (1), interior pressure ram (2), interior recipient (3), outer recipient (4), ring-type semi-solid blank (5), bar-shaped semi-solid blank (6), heating collar (7), shaping guide plate (8), plug (9), double-layer composite pipe (10), mould hold-down screw (11), Extruding die (12), knock-pin (13), workbench (14);
Described outer pressure ram (1) and interior pressure ram (2) are separately fixed on the outside slide block and inner slide block of double action press, and it can be moved up and down with slide block;
Place ring-type semi-solid blank (5) in described between recipient (3) and the outer recipient (4), the inner bar-shaped semi-solid blank (6) of placing of recipient in described (3);
The outer setting heating collar (7) of described outer recipient (4), so that preheating double-layer composite pipe semi-solid multi-blank extrusion molding apparatus makes double-layer composite pipe semi-solid multi-blank extrusion molding apparatus remain on about 280 ℃ in the semi-solid multi-blank extrusion process;
Inside at described shaping guide plate (8), bar-shaped semi-solid blank (6) and ring-type semi-solid blank (5) interior pressure ram (2) and outside flow downward continuously under the effect of pressure ram (1) and meet at the following portion of shaping guide plate (8), form interior pipe by plug (9), form the multiple tube outer surface by Extruding die (12);
The double-layer composite pipe of described double-layer composite pipe (10) for being shaped by the semi-solid multi-blank pressing method, it is positioned between plug (9) and the Extruding die (12);
Described mould hold-down screw (11) is the fixing screw of double-layer composite pipe semi-solid multi-blank extrusion molding apparatus, and double-layer composite pipe is shaped under semi-solid temperature, makes closely connection between inner tube and the outer tube;
Described double-layer composite pipe (10) moves upward by knock-pin (13) and is ejected, and the controlled movement of described knock-pin (13) is in the following hydraulic cylinder of double action press.
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| CN102728649B (en) * | 2012-06-18 | 2015-01-21 | 北京有色金属研究总院 | Preparation method of magnesium-aluminum layered composite material thin-wall pipe |
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| CN101020201A (en) | 2007-08-22 |
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