CN103920734A - Extrusion moulding mold and method in semi-solid state preparation method of aluminium-coating magnesium composite pipe - Google Patents
Extrusion moulding mold and method in semi-solid state preparation method of aluminium-coating magnesium composite pipe Download PDFInfo
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Abstract
The invention relates to an extrusion moulding mold and method in a semi-solid state preparation method of an aluminium-coating magnesium composite pipe. The inner layer of the composite pipe is made from AZ91S magnesium alloy, and the outer layer of the composite pipe is made from 7075 aluminium alloy. The extrusion moulding method comprises preparation of blank, secondary heating and semi-solid state extrusion moulding, and specifically comprises the following steps: placing prepared aluminium alloy semi-solid state blank and magnesium alloy semi-solid state blank with solid fraction being 70%-90% into an extrusion cavity of an extrusion barrel through a hot charging process, and performing extrusion moulding to obtain the aluminium-coating magnesium composite pipe with the wall thickness of 4-8mm and the length of 1,200-3,000mm, wherein the preheating temperature of the mold is 250-300 DEG C, and the extrusion speed is 60-150mm/s. According to the invention, the bonding interface of the aluminium-coating magnesium composite pipe completely reaches the metallurgical bonding, and compared with other moulding methods, the extrusion moulding method has the advantages of high efficiency, short flow, good pipe quality, simple structure, and simplicity in implementation; the prepared aluminium-coating magnesium composite pipe is small in density, and high in specific strength and specific stiffness, the outer layer is corrosion-resistant, the inner layer is good in shock absorption and shock resistance, and the prepared aluminium-coating magnesium composite pipe is particularly suitable for the fields of manufacturing of baggage holders of high speed trains, seats, portable bicycle frames, high-grade lamps and lanterns, and the like, and has very wide application prospect.
Description
Technical field
The present invention relates to a kind of aluminium bag magnesium multiple tube and prepare mould and method, particularly a kind of mold for extruding and forming and the method in aluminium bag magnesium multiple tube semisolid preparation method.
Background technology
Two-layer compound tubing refers to the tubing that inside and outside layer is prepared from by certain processing method by dissimilar metal, and its inside and outside layer metal has respectively different character, to meet the requirement of different operating environment.At present, composite pipe has broad application prospects in a plurality of fields such as vehicles manufacture, conveyance conduit, Aero-Space.Along with the develop rapidly of Chinese national economy new and high technology and defence and military, for the demand of composite pipe, constantly increase, also more and more higher to the requirement of product quality.Particularly in recent years, china natural resources, environmental problem become increasingly conspicuous, and the processing method of composite pipe have been proposed to the requirements such as greenization, short procedure, high efficiency.Aluminium bag magnesium pipe is a kind of excellent performance and the huge composite pipe of application potential, its outer field aluminium alloy has the features such as density is low, corrosion-resistant, attractive in appearance, and the magnesium alloy of its internal layer has that density is low, shock-absorbing performance and the feature such as resistance to shock loads excellent performance, specific strength and specific stiffness be large.Aluminium bag magnesium pipe is particularly suitable for producing railway car luggage carrier, seat and portable bicycle frame capable and high-grade light fixture etc.
Conventional technique of composite tube production at least needs two work steps: the first step is to produce respectively outer aluminium-alloy pipe and internal layer magnesium-alloy tube; Second step is that the mono-layer tube that adopts method coated or welding that the first step is produced carries out composite joint.Obviously, this method at least exists two shortcomings: be first that the explained hereafter cycle is long, can not realize once-forming, energy consumption is higher; Secondly, the multiple tube that the method for employing welding is produced, inner tube is combined not tight with outer tube, and between pipe, gap and stress easily cause product failure.
Liquid metal continuous casting composite algorithm also can (be shown in: Su second place for the preparation of double-layer composite pipe, Liu Xinhua, Wu Yongfu, Deng. the microstructure and property of horizontal casting direct combination forming copper cladding aluminum composite. Special Processes of Metal Castings and non-ferrous alloy, 2011, 31 (9): 785-789), belong to liquid phase-liquid phase composite algorithm, this manufacturing process is conducive to improve the quality of composite pipe, but exist equipment investment cost high (needing specific Casting Equipment), production temperature high (processing temperature all in aluminium alloy phase line more than 100 ℃), production efficiency low (average casting speed only has 60-90mm/min), energy resource consumption is large, production process is difficult to accurate control, and (throwing easily produces drawing crack, the phenomenon such as overlapping) defect such as, limited the prospect of its application.
In addition, traditional rolling crimping method and clad welded method production technology, all belong to solid phase-solid phase complex method, exist that the technological process of production is long, cost is high, environmental pressure is large, be difficult to prepare the composite pipe of abnormity or large-size, ectonexine pipe be difficult to reach the problems such as metallurgical binding effect (see: Luo Ruixue. the extrusion forming process research of composite bimetal pipe. heat processing technique, 2010,39 (13): 87-89).
Therefore the method that shapes and the shaping dies of, developing the composite pipe that a kind of high efficiency, short flow process, greenization and interface reach metallurgical binding have very important practical significance.
Summary of the invention
In order to improve production efficiency and the quality of aluminium bag magnesium pipe, the present invention proposes a kind of semisolid extrusion forming process technology, and design a set of mould for extrusion molding.
Aluminium bag magnesium pipe prepared by this manufacturing process has advantages of that technological process is short, energy consumption is low, ectonexine pipe combination interface reaches metallurgical binding, and its mold for extruding and forming is rational in infrastructure, flexibly, easy to implement.
The first object of the present invention is to provide the mold for extruding and forming in a kind of aluminium bag magnesium multiple tube semisolid preparation method, and described mold for extruding and forming comprises resistive heater (1), recipient (9), inner tube extrusion die (13), outer tube extrusion die (14), plug (5), base (15);
Resistive heater (1) is positioned at recipient (9) outside;
Recipient offers central through hole on (9), and recipient (9) is uniformly distributed four extrusion chambers placing magnesium alloy, aluminium alloy semi-solid state blank, is respectively two inner tube extrusion chambers (4) and two outer tube extrusion chambers (8); Recipient (9) bottom center has groove, places successively described inner tube extrusion die (13) and outer tube extrusion die (14) in groove from top to bottom;
Inner tube extrusion die (13) upper surface is provided with the first seam chamber (11) by the groove type of its central through hole, the first two ends, seam chamber (11) lays respectively at two inner tube extrusion chambers (4) bottom, and the first seam chamber (11) bilateral symmetry offers two through holes (21) simultaneously;
Outer tube extrusion die (14) upper surface is provided with the second seam chamber (12) by the groove type of its central through hole, the second two ends, seam chamber (12) lays respectively at two outer tube extrusion chambers (8) bottom, and is communicated with outer tube extrusion chamber (8) by two through holes (21) on inner tube extrusion die (13);
Base (15) has base extrusion cavities (16), and described base extrusion cavities (16) is the central through hole of base (15);
The central through hole of described recipient (9), inner tube extrusion die (13), outer tube extrusion die (14) and base (15) is from top to bottom communicated with successively, in order to place plug (5); Plug (5) top, bottom are the different cylindrical structural of radius, and middle part is truncated cone-shaped structure.
Preferably, described four extrusion chambers are uniformly distributed centered by recipient (9) central through hole, and two inner tube extrusion chambers (4) and two outer tube extrusion chambers (8) are alternately distributed, for placing respectively magnesium alloy, aluminium alloy semi-solid state blank; Described mold for extruding and forming also comprises inner tube pressure ram (3), the outer tube pressure ram (7) being positioned over respectively in inner tube extrusion chamber (4) and two outer tube extrusion chambers (8).
Preferably, described the first seam chamber (11) and the second seam chamber (12) intersect vertical track type groove for direction, and the through hole (21) on described inner tube extrusion die (13) is manhole.
Preferably, inner tube extrusion die (13) bottom is provided with water conservancy diversion centrum (19), and the cone angle of water conservancy diversion centrum is 10-30 °, is highly 20-25mm.
Preferably, the difference of the radius of outer tube extrusion die (14) central through hole and inner tube extrusion die (13) central through hole is greater than reducing poor of inner tube extrusion die (13) central through hole and plug bottom.
The present invention's the second object is to provide a kind of aluminium bag magnesium pipe semisolid extrusion forming method that utilizes above-mentioned mold for extruding and forming one of arbitrarily, and described extrusion forming method comprises:
First step 1. heats aluminium alloy, magnesium alloy semi-solid state blank respectively, the post bake temperature of aluminium alloy semi-solid state blank is 598-617 ℃, the post bake temperature of magnesium alloy semi-solid state blank is 579-584 ℃, wherein, aluminium alloy and magnesium alloy semi-solid state blank solid rate are 70-90%, and aluminium alloy and magnesium alloy semi-solid state blank are put into respectively to outer tube extrusion chamber 8 and inner tube extrusion chamber 4;
Step 2. utilizes 1 pair of mold for extruding and forming of resistive heater to carry out preheating, and preheat temperature is 250-300 ℃;
Step 3. extruder applies extruding force by the pressure ram in outer tube extrusion chamber 8 and inner tube extrusion chamber 4 to aluminium alloy, magnesium alloy semi-solid state blank, and aluminium bag magnesium pipe is extruded and seam under pressure from base extruded hole 16, is finally shaped.
Preferably, described aluminium alloy, magnesium alloy semi-solid state blank are the bar-shaped blank of aluminium alloy, magnesium alloy with microstructure of semisolid feature, and blank diameter is 60-80mm, is highly less than or equal to 1.5 times of its diameter.
Preferably, in described step 3, the extrusion speed of extruder is 60-150mm/s.
The present invention's the 3rd object is to provide a kind of aluminium bag magnesium multiple tube, and its internal layer tubing is AZ91D magnesium alloy, and outer tubing is 7075 aluminium alloys.
Preferably, the wall thickness of described aluminium bag magnesium multiple tube is 4-8mm, and length is 1200-3000mm.
Advantage of the present invention is, the outer aluminium alloy of aluminium bag magnesium multiple tube has the features such as intensity is high, corrosion-resistant, attractive in appearance, and internal layer magnesium alloy has advantages of that shock-absorbing performance is good, density is little; This mold for extruding and forming has inner tube extrusion die and outer tube extrusion die, and inner layer metal magnesium alloy and outer layer metal aluminium alloy first carry out respectively seam in extrusion die, then are extruded by through hole, and mould structure is simple, is convenient to implement; The semisolid extrusion forming method that the present invention adopts, because extrusion billet is between solid-liquid two-phase region, than solid molding, extruding force is lower, and than liquid forming, can reduce oxidation, and energy consumption is lower.Ectonexine pipe has different semisolid extrusion temperatures, and realizes the metallurgical binding at bimetallic tube interface, has improved intensity and the quality of aluminium bag magnesium pipe.Aluminium bag magnesium pipe has low-down density and high specific strength, high specific stiffness, decay resistance and shock-absorbing performance, therefore have broad application prospects in a plurality of fields such as bullet train luggage carrier, seat, portable bicycle, senior light fixtures.
The present invention adopts semisolid pressing method shaping aluminium bag magnesium pipe, compares with casting, has the advantages that forming temperature is low, reduce burning; Compare with welding, have that technological process is short, once-forming, interface reach the advantages such as metallurgical binding.Aluminium alloy, magnesium alloy that the present invention adopts are bar-shaped blank, compare with existing employing annular blank pressing method, do not need previously prepared annular blank, have saved the process-cycle, have reduced expense.The extrusion die that the present invention adopts has inner tube extrusion die and outer tube extrusion die, internal layer magnesium-alloy tube and outer aluminium-alloy pipe are respectively used to be shaped, every layer of pipe seam in finishing die separately respectively, and then extruded and compound by extrusion cavities, reduced the defects such as uneven thickness that cause due to aluminium, magnesium alloy deformation drag difference.The structure of extrusion that the present invention adopts is simple, and handling ease is convenient to change, can be according to the aluminium bag magnesium tubing of the differing formed different wall of extrusion die extruded hole.
Accompanying drawing explanation
Fig. 1 is that mold for extruding and forming launches generalized section.
In figure: 1. resistive heater; 2. the bar-shaped blank of magnesium alloy; 3. inner tube pressure ram; 4. inner tube extrusion chamber; 5. plug; 6. plug clamp nut; 7. outer tube pressure ram; 8. outer tube extrusion chamber; 9. recipient; 10. the bar-shaped blank of aluminium alloy; 11. first seam chambeies; 12 second seam chambeies; 13. inner tube extrusion dies; 14. outer tube extrusion dies; 15. bases; 16. extrusion cavities; 17. trip bolts; 18. aluminium bag magnesium pipes; 19. water conservancy diversion centrums; 20. dog screw axial location; 21. manholes; 22. dog screw screwed holes.
Fig. 2 is that inner tube extrusion die 1/4 dissects axle and measures intention.
Fig. 3 is outer tube extrusion die structural representation.
The specific embodiment
Fig. 1 is that mold for extruding and forming of the present invention be take the expansion generalized section of two section planes that mutually vertical and intersecting lens is mould vertical center axis after dissecing, as shown in Figure 1, mold for extruding and forming comprises resistive heater 1, recipient 9, inner tube extrusion die 13, outer tube extrusion die 14, plug 5, base 15, inner tube pressure ram 3, outer tube pressure ram 7, trip bolt 17, clamp nut 6 and dog screw.
In mold for extruding and forming, be positioned at the resistive heater 1 of recipient 9 outsides for mold for extruding and forming is carried out to preheating, and guarantee that mold for extruding and forming is temperature-resistant in the process of multiple tube extrusion molding.
Recipient 9 centers are provided with vertical central through hole, recipient 9 be take its central through hole and as axle center, is uniformly distributed four cylindrical extrusion chambers, be respectively two inner tube extrusion chambers 4 and two outer tube extrusion chambers 8, two inner tube extrusion chambers 4 and two outer tube extrusion chambers 8 are alternately distributed, and are used for placing magnesium alloy, aluminium alloy semi-solid state blank.
Recipient 9 bottom center have cylinder shape groove, place successively inner tube extrusion die 13 and the outer tube extrusion die 14 mating with groove in groove from top to bottom.
As shown in Figure 2, inner tube extrusion die 13 is cylindrical structural, offer vertical central through hole, inner tube extrusion die 13 upper surfaces are provided with the first seam chamber 11 by its central through hole, the first seam chamber 11 is a track type (being comprised of a rectangle in the middle of the semi arch of two, both sides) groove, the first 11 two ends, seam chamber lays respectively at two inner tube extrusion chamber 4 bottoms, by inner tube extrusion chamber 4, the bar-shaped blank 2 of magnesium alloy is clamp-oned to the first interior seam in seam chamber 11, the first seam chamber 11 bilateral symmetry offer two manholes 21 simultaneously, described manhole 21 is positioned at two outer tube extrusion chamber 8 bottoms, and be communicated with two outer tube extrusion chamber 8 bottoms respectively, so that the bar-shaped blank 10 of aluminium alloy by and arrive outer tube extrusion die 14, inner tube extrusion die 13 bottoms are provided with water conservancy diversion centrum 19, and for outer tube aluminium alloy is implemented to force in extrusion, wherein, the cone angle of water conservancy diversion centrum is 10-30 °, is highly 20-25mm.Inner tube extrusion die 13 surroundings have dog screw screwed hole 22, for placement positioning screw to position with outer tube extrusion die 14, recipient 9.
As shown in Figure 3, outer tube extrusion die 14 is similarly cylindrical structural, offers vertical central through hole; Outer tube extrusion die 14 upper surfaces are provided with the second seam chamber 12, the second seam chamber 12 is for intersecting vertical track type groove with the first seam cavity direction, the second 12 two ends, seam chamber lays respectively at two outer tube extrusion chamber 8 bottoms, and be communicated with outer tube extrusion chamber 8 bottoms by two manholes 21 on inner tube extrusion die 13, make the bar-shaped blank 10 of aluminium alloy successively by outer tube extrusion chamber 8, manhole 21, clamp-on the second interior seam in seam chamber 12.Outer tube extrusion die 14 surroundings have dog screw screwed hole 22, for placement positioning screw to position with inner tube extrusion die 13, recipient 9.
Base 15 is cylinder, offers vertical central through hole, and base extrusion cavities 16, for extruding of bimetallic tube; Surrounding has screwed hole, to place trip bolt 17, base 15 is connected with recipient 9.
The circular central through hole of above-mentioned recipient 9, inner tube extrusion die 13, outer tube extrusion die 14 and base 15 is from top to bottom communicated with successively, in order to place plug 5, plug 5 tops are cylindrical structural, and top has screw thread, fixing with recipient 9 by plug clamp nut 6; Plug bottom is the cylindrical structural that radius is less than plug top, for formed composite pipe, middle part is positioned at the first seam chamber 11 of inner tube extrusion die 13, is the truncated cone-shaped structure to the transition of plug bottom by plug top, for internal layer magnesium-alloy tube is applied to force in extrusion.
In order to prevent, due to the intensity of magnesium alloy, phenomenon of rupture occurs in extrusion process lower than the intensity of aluminium alloy, also be for ease of realizing the further lightweight of aluminium bag magnesium pipe simultaneously, in the present invention, the thickness of internal layer magnesium-alloy tube is greater than the thickness of outer aluminium-alloy pipe, for this reason, the difference of the radius of outer tube extrusion die 14 central through holes and inner tube extrusion die 13 central through holes is greater than reducing poor of inner tube extrusion die 13 central through holes and plug bottom.
Because mold for extruding and forming comprises inner tube extrusion die 13 and outer tube extrusion die 14, inner tube extrusion die 13 is positioned at outer tube extrusion die top 14, therefore when extrusion molding, the position of inner tube pressure ram 3 will be positioned at the top of outer tube pressure ram 7, guarantee that first extruder touches inner tube pressure ram 3, first internal layer magnesium blank is extruded and is shaped.
In multiple tube extrusion process: internal layer magnesium alloy is subject to the effect flow deformation of inner tube pressure ram 3 in recipient 9, and in the first interior seam in seam chamber 11, by inner tube extrusion die central through hole, extruded downwards subsequently; Outer aluminium alloy is subject to the effect flow deformation of outer tube pressure ram 7 in recipient, and in the second interior seam in seam chamber 12, is extruded downwards subsequently by outer tube extrusion die central through hole; Internal layer magnesium alloy, together with being in contact with one another also seam under the effect of outer aluminium alloy in extruding force, being extruded and is shaped from base extrusion cavities 16 along plug, realizes metallurgical binding simultaneously.
Thus, the extrusion forming method of the aluminium bag magnesium multiple tube that the present invention proposes, is by hot-mounting process, aluminium alloy, the bar-shaped blank of magnesium alloy semi solid state to be carried out to extrusion molding on extruder.Comprise the following steps:
Before step 1. extrusion molding, first aluminium alloy, magnesium alloy semi-solid state blank are carried out once respectively (for semi-solid rheological extrusion forming process, only once heat) or secondary (for Semi-Solid Thixoforming extrusion forming process, need to carry out post bake) heating, heating-up temperature: 7075 aluminium alloys are 598-617 ℃, AZ91D magnesium alloy is 579-584 ℃, solid rate is all 70-90%, the semi-solid temperature that it is reached is separately interval, and puts into corresponding extrusion chamber (outer tube extrusion chamber 8 and inner tube extrusion chamber 4).
Described aluminium alloy, magnesium alloy semi-solid state blank are the bar-shaped blank of aluminium alloy, magnesium alloy with microstructure of semisolid feature, and blank diameter is 60-80mm, are highly less than or equal to 1.5 times of its diameter.Described extrusion molding blank is two blocks of bar-shaped blanks of aluminium alloy, two blocks of bar-shaped blanks of magnesium alloy, and blank of the same race is staggered relatively.
Step 2. utilizes 1 pair of mold for extruding and forming of resistive heater to carry out preheating, and preheat temperature is 250-300 ℃.
Step 3. extruder applies axially downward extruding force by pressure ram to aluminium alloy, magnesium alloy semi-solid state blank, and aluminium bag magnesium pipe is extruded and seam under pressure from base extruded hole 16, is finally shaped.
For guaranteeing that aluminium alloy, magnesium alloy blank temperature keep semi-solid temperature in extrusion process, needing to control extrusion speed is 60-150mm/s.Simultaneously because magnesium alloy has inflammability, therefore need to pass into protective gas argon gas when extrusion molding.
The aluminium bag magnesium composite pipe obtaining according to the present invention, skin is 7075 aluminium alloys, internal layer is AZ91D magnesium alloy.Bimetallic tube ectonexine combination interface reaches metallurgical binding.The wall thickness of aluminium bag magnesium multiple tube is 4-8mm, and multiple tube length is 1200-3000mm.
embodiment 1:
The present embodiment relates to a kind of Semi-Solid Thixoforming extrusion forming process of aluminium bag magnesium pipe.Wherein, thixotropic forming is first magnesium alloy or aluminium alloy cast ingot to be prepared into the blank with non-dendritic structure pattern through heating (once heating) and whipping step, the complete blank that cuts into a certain size after cooling.During shaping, this blank is directly heated to (post bake) and to semi-solid temperature, can carry out extrusion molding.The multiple tube internal diameter of preparation is 20mm, wall thickness 4mm, and wherein internal layer Mg alloy AZ91 D wall thickness is 2.5mm, outer aluminium alloy 7075 wall thickness are 1.5mm.The magnesium alloy using, aluminium alloy semi-solid state blank are the bar of diameter 60mm, and length is 90mm.Resistive heater 1 guarantees that the preheat temperature of mold for extruding and forming is 250 ℃.Magnesium alloy, aluminium alloy semi-solid state blank are heated respectively in induction heater.The semi-solid temperature of outer aluminium alloy 7075 is 598 ℃, and the semi-solid temperature of internal layer Mg alloy AZ91 D is 579 ℃.Subsequently rapidly by the aluminum alloy blank after heating, outer tube extrusion chamber 8 and inner tube extrusion chamber 4 that magnesium alloy blank is respectively put into recipient 9, xenogenesis blank placed adjacent.The extrusion speed of setting extruder is 150mm/s and starts extruding.Under the effect of pressure ram 3,7, in mould seam chamber 11,12, interior weldering merga pass central through hole is shaped respectively for magnesium, aluminum alloy blank, and aluminium bag magnesium pipe is extruded by base extrusion cavities 16 places.
embodiment 2:
The present embodiment relates to a kind of Semi-Solid Thixoforming extrusion forming process of aluminium bag magnesium pipe.The multiple tube internal diameter of preparation is 20mm, heavy wall 5mm, and wherein internal layer Mg alloy AZ91 D wall thickness is 3mm, outer aluminum pipe wall thickness is 2mm.The magnesium alloy using, aluminium alloy semi-solid state blank are the bar of diameter 80mm, and length is 110mm.Resistive heater 1 guarantees that the preheat temperature of mold for extruding and forming is 300 ℃.Magnesium alloy, aluminium alloy semi-solid state blank are heated respectively in induction heater.The semi-solid temperature of outer 7075 aluminium alloys is 617 ℃, and the semi-solid temperature of internal layer AZ91D magnesium alloy is 584 ℃.Subsequently rapidly by the aluminium alloy after heating, outer tube extrusion chamber 8 and inner tube extrusion chamber 4 that magnesium alloy blank is respectively put into mould recipient 9, xenogenesis blank placed adjacent.The extrusion speed of setting extruder is 60mm/s and starts extruding.Under the effect of pressure ram 3,7, in mould seam chamber 11,12, interior weldering merga pass central through hole is shaped respectively for magnesium, aluminum alloy blank, and aluminium bag magnesium pipe is extruded by base extrusion cavities 16 places.
embodiment 3:
The present invention relates to a kind of semi-solid rheological extrusion forming process of aluminium bag magnesium pipe.Wherein, rheological molding is the simplification of thixotropic forming, directly alloy cast ingot is formed after non-dendritic structure through heating and stirring action, is cooled to semi-solid temperature interval (not exclusively cooling), immediately extrusion molding.The multiple tube internal diameter of preparation is 20mm, wall thickness 8mm, and wherein internal layer Mg alloy AZ91 D wall thickness is 5mm, outer aluminium alloy 7075 wall thickness are 3mm.Resistive heater guarantees that the preheat temperature of mold for extruding and forming is 280 ℃.The commercial AZ91 magnesium alloy of the bulk of processing through super-dry, 7075 aluminium alloy cast ingots are heated to, after complete fusion temperature, be incubated standing 20min at resistance-heated furnace respectively.Slurry after standing is poured into diameter in mechanical agitation after a period of time be 70mm, length is in the blanking mold of 100mm, when being cooled to 605 ℃, AZ91 magnesium alloy, 7075 aluminium alloys are cooled to after the semi-solid temperature of 581 ℃, rapidly aluminum alloy blank, magnesium alloy blank are respectively put in the outer tube extrusion chamber 8 and inner tube extrusion chamber 4 of mould recipient 9 to xenogenesis blank placed adjacent.The extrusion speed of setting extruder is 100mm/s and starts extruding.Under the effect of pressure ram 3,7, in mould seam chamber 11,12, interior weldering merga pass central through hole is shaped respectively for magnesium, aluminum alloy blank, and aluminium bag magnesium pipe is extruded by base extrusion cavities 16 places.
In the description of this description, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (10)
1. the mold for extruding and forming in aluminium bag magnesium multiple tube semisolid preparation method, is characterized in that: described mold for extruding and forming comprises resistive heater (1), recipient (9), inner tube extrusion die (13), outer tube extrusion die (14), plug (5), base (15);
Resistive heater (1) is positioned at recipient (9) outside;
Recipient offers central through hole on (9), and recipient (9) is uniformly distributed four extrusion chambers placing magnesium alloy, aluminium alloy semi-solid state blank, is respectively two inner tube extrusion chambers (4) and two outer tube extrusion chambers (8); Recipient (9) bottom center has groove, places successively described inner tube extrusion die (13) and outer tube extrusion die (14) in groove from top to bottom;
Inner tube extrusion die (13) upper surface is provided with the first seam chamber (11) by the groove type of its central through hole, the first two ends, seam chamber (11) lays respectively at two inner tube extrusion chambers (4) bottom, and the first seam chamber (11) bilateral symmetry offers two through holes (21) simultaneously;
Outer tube extrusion die (14) upper surface is provided with the second seam chamber (12) by the groove type of its central through hole, the second two ends, seam chamber (12) lays respectively at two outer tube extrusion chambers (8) bottom, and is communicated with outer tube extrusion chamber (8) by two through holes (21) on inner tube extrusion die (13);
Base (15) has base extrusion cavities (16), and described base extrusion cavities (16) is the central through hole of base (15);
The central through hole of described recipient (9), inner tube extrusion die (13), outer tube extrusion die (14) and base (15) is from top to bottom communicated with successively, in order to place plug (5); Plug (5) top, bottom are the different cylindrical structural of radius, and middle part is truncated cone-shaped structure.
2. the mold for extruding and forming in aluminium bag magnesium multiple tube semisolid preparation method as claimed in claim 1, described four extrusion chambers are uniformly distributed centered by recipient (9) central through hole, two inner tube extrusion chambers (4) and two outer tube extrusion chambers (8) are alternately distributed, for placing respectively magnesium alloy, aluminium alloy semi-solid state blank; Described mold for extruding and forming also comprises inner tube pressure ram (3), the outer tube pressure ram (7) being positioned over respectively in inner tube extrusion chamber (4) and two outer tube extrusion chambers (8).
3. the mold for extruding and forming in aluminium bag magnesium multiple tube semisolid preparation method as claimed in claim 1, it is characterized in that, described the first seam chamber (11) and the second seam chamber (12) intersect vertical track type groove for direction, and the through hole (21) on described inner tube extrusion die (13) is manhole.
4. the mold for extruding and forming in aluminium bag magnesium multiple tube semisolid preparation method as claimed in claim 1, is characterized in that, inner tube extrusion die (13) bottom is provided with water conservancy diversion centrum (19), and the cone angle of water conservancy diversion centrum is 10-30 °, is highly 20-25mm.
5. the mold for extruding and forming in aluminium bag magnesium multiple tube semisolid preparation method as claimed in claim 1, it is characterized in that, the difference of the radius of outer tube extrusion die (14) central through hole and inner tube extrusion die (13) central through hole is greater than reducing poor of inner tube extrusion die (13) central through hole and plug bottom.
6. an aluminium bag magnesium pipe semisolid extrusion forming method that utilizes one of any mold for extruding and forming of the claims, is characterized in that, described extrusion forming method comprises:
First step 1. heats aluminium alloy, magnesium alloy semi-solid state blank respectively, the post bake temperature of aluminium alloy semi-solid state blank is 598-617 ℃, the post bake temperature of magnesium alloy semi-solid state blank is 579-584 ℃, wherein, aluminium alloy and magnesium alloy semi-solid state blank solid rate are 70-90%, and aluminium alloy and magnesium alloy semi-solid state blank are put into respectively to outer tube extrusion chamber 8 and inner tube extrusion chamber 4;
Step 2. utilizes 1 pair of mold for extruding and forming of resistive heater to carry out preheating, and preheat temperature is 250-300 ℃;
Step 3. extruder applies extruding force by the pressure ram in outer tube extrusion chamber 8 and inner tube extrusion chamber 4 to aluminium alloy, magnesium alloy semi-solid state blank, and aluminium bag magnesium pipe is extruded and seam under pressure from base extruded hole 16, is finally shaped.
7. aluminium bag magnesium pipe semisolid extrusion forming method according to claim 6, it is characterized in that, described aluminium alloy, magnesium alloy semi-solid state blank are the bar-shaped blank of aluminium alloy, magnesium alloy with microstructure of semisolid feature, and blank diameter is 60-80mm, are highly less than or equal to 1.5 times of its diameter.
8. aluminium bag magnesium pipe semisolid extrusion forming method according to claim 6, is characterized in that, in described step 3, the extrusion speed of extruder is 60-150mm/s.
9. an aluminium bag magnesium multiple tube, is characterized in that: described aluminium bag magnesium multiple tube internal layer tubing is AZ91D magnesium alloy, and outer tubing is 7075 aluminium alloys.
10. aluminium bag magnesium pipe according to claim 9, is characterized in that: the wall thickness of described aluminium bag magnesium multiple tube is 4-8mm, and length is 1200-3000mm.
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| CN105642693A (en) * | 2014-12-02 | 2016-06-08 | 财团法人金属工业研究发展中心 | Composite pipe and manufacturing method thereof |
| CN106513458A (en) * | 2016-11-10 | 2017-03-22 | 无锡市明盛强力风机有限公司 | Hydrostatic extrusion forming process for magnesium alloy/aluminum alloy pipe |
| CN107042246A (en) * | 2016-04-28 | 2017-08-15 | 西北大学 | A kind of method that utilization drawing method produces composite bimetal pipe |
| CN107486477A (en) * | 2017-09-29 | 2017-12-19 | 山东大学 | A kind of Al/Mg/Al composite boards bridge die extrusion building mortion and method |
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