CN102489958A - Process and equipment for manufacturing wide-width magnesium alloy plate in coils - Google Patents
Process and equipment for manufacturing wide-width magnesium alloy plate in coils Download PDFInfo
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- CN102489958A CN102489958A CN2011104048788A CN201110404878A CN102489958A CN 102489958 A CN102489958 A CN 102489958A CN 2011104048788 A CN2011104048788 A CN 2011104048788A CN 201110404878 A CN201110404878 A CN 201110404878A CN 102489958 A CN102489958 A CN 102489958A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
- B21C35/02—Removing or drawing-off work
- B21C35/023—Work treatment directly following extrusion, e.g. further deformation or surface treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
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- B21C23/04—Making uncoated products by direct extrusion
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Abstract
The invention relates to the technical field of process and equipment for a new non-ferrous metal material and discloses a process and equipment for manufacturing a wide-width magnesium alloy plate. In the process, an as-cast rod material is subjected to milling face scaling, multi-axis forging, machining, high-temperature ageing, heating, extruding, flattening and coiling to finish the coiling production of the wide-width magnesium alloy plate. The equipment comprises a multi-axis forging machine, an extruding machine, a flattening machine and a coiling machine; the extruding machine, the flattening machine and the coiling machine are arrayed along a discharging axis of the magnesium alloy plate and are controlled by a synchronous control system, wherein the extruding machine is internally provided with a semi-circular or wavy arc-shaped extruding and distributing module; and a rod material heater is arranged at the inlet end of the extruding and distributing module. According to the invention, by utilization of the small-tonnage extruding machine and a mould in which an arc line between two points is longer than a straight line between the two points, the wide-width magnesium alloy plate which is larger than the size of the outlet of the extruding machine is produced in coils through an arc surface rolling and flattening machine for flattening an arc surface. The coiling production of the wide-width magnesium alloy plate can be finished with smaller investment.
Description
Technical field
The present invention relates to nonferrous materials processing and equipment technical field, relate in particular to a kind of Processes and apparatus of rolling production wide cut magnesium alloy board.
Background technology
Magnesium is one of element the richest on the earth, in present practical applications, is the metal material that quality (1.74g/cm3) is the lightest, specific strength is the highest, compares with the lightweight engineered plastics, and magnesium alloy has higher elasticity and plastic deformation ability; (2.8g/cm3) compares with aluminium alloy, and magnesium alloy is not only light, and anti-vibration and noise reduction sound ability height, and has very strong decay resistance, capability of electromagnetic shielding, shielding property, recovery utilization rate advantages of higher.Therefore; Be the most desirable, the most practical lightweight structural material in pillar industries such as communications and transportation (automobile), Aero-Space, letterpress, electronics (3C Product) and household electrical appliance, be called as the green engineering material of tool development and application potentiality " 21 century ".
The magnesium alloy application form mainly contains cast magnesium alloy and wrought magnesium alloy.Wrought magnesium alloy is through pressure rolling, extruding; Have advantages such as grain refinement, intensity is high, the extension performance is good; Wherein magnesium alloy sheet is expected extensive use in fields such as machine-building, Aero-Space, automobile, electronics, instrument, chemical industry and digital product; Added value of product and economic benefit are higher, have bright prospects.Carry out research and the application with high-performance magnesium-alloy of automobile, motorcycle the earliest in North America, Europe; The demand of magnesium alloy die casting and deformed magnesium alloy material increases with the amplification of annual 20% fast in recent years, and Japan has thrown huge fund and carried out 3C Product Mg Alloy and application.
With at present ripe magnesium alloy cast compared with techniques, the development of Technology of Plastic Processing such as the forging of magnesium alloy, extruding, rolling, punching press and superplastic forming technology is then relatively slow.
Two kinds of technologies of the general employing of current domestic and international production magnesium alloy sheet:
1, finish rolling again after the casting cogging: casting-milling technology parameter control difficulty, maturity is lower, and technical difficulty is higher.Should not realize that package produces continuously.
2, finish rolling again behind the extrusion blooming, advantage are that good, the easy realization of material structure performance is produced continuously, the rolling supply of material, shortcoming be disposablely have high input, template control difficulty.The restriction of machine outlet size and extruding force owing to be squeezed, the general maximum of 2500t extruder cogging width can only reach about 300, and large-tonnage extruder cost is very expensive.Because magnesium belongs to the close-packed hexagonal crystal structure, at room temperature have only a slide surface, 3 solid matter directions are arranged on the slide surface, so have only 3 slip systems under the room temperature, it is moulding cube all lower with body-centered cubic than the center of area.Under the room temperature, the plasticity of magnesium alloy is relatively poor, deformation and be prone to deformation defect, and this has the decision of magnesium alloy self property, also is the essential reason of restriction magnesium alloy machine-shaping.In extrusion process, material yield intensity is low more, and technology stability is high more; Yield tensile ratio is more little, and extrusion performance is good more.Influence factor has: the crystallite dimension of extruding force, extrusion speed, mold temperature, bar temperature, mould structure, bar aging technique, material etc.The crystallite dimension of material and shape have great influence to the extrusion performance of sheet material.
This shows the high investment of process equipment and inefficient production, the low expensive high volume applications that limits the high-performance magnesium-alloy rolled sheet metal that causes of yield rate.
Summary of the invention
For overcoming the deficiency of prior art; The Processes and apparatus that the purpose of this invention is to provide a kind of rolling production wide cut magnesium alloy board; Can satisfy the needed mechanical property condition of the rolling magnesium alloy plate of little tonnage extruder, control template, the purpose that realizes the cogging of small-sized extruder wide cut degree with the extrusion die and the corollary equipment of brand new ideas.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
A kind of technology of rolling production wide cut magnesium alloy plate, be the as cast condition bar is stripped off the skin through milling face-multiaxis forges-machining-high-temperature aging-bar heats-push-flatten-curl; Concrete steps are following:
A. the magnesium alloy cast bar strips off the skin and removes surface casting cold shut layer through milling face; In 230 ° of C-350 ° C scope, carry out 5 passage multiaxises and forge, process ￠ 600 poles through machining;
B. ￠ 600 poles are carried out the thinning microstructure of 460 ° of C high-temperature agings again, improve the extrusion performance and the rolling performance of material; Make magnesium alloy materials through shrinkage porosite, shrinkage cavity, make the part crackle be eliminated the formation fibr tissue by seam, segregation; Make thick column crystal of part and dendritic crystal be transformed into tiny, uniform equiax crystal; Make and cooperate the cooled crystallization again of high-temperature aging to obtain the subgrain tissue; Under electron microscope, TEM tissue particles average out to d=0.8 μ m; Described ￠ 600 pole performances at room temperature, percentage elongation is 40%, hot strength is 450MPa; At 200 ° of C, percentage elongation is 500%, has the stability of high heat, adds man-hour, is difficult for taking place defective coarse, crackle;
C. the wavy curved working face Extrusion Porthole Die for Aluminium Profiles tool of the wide cut 620mm plate that is processed to be provided with in ￠ 240 and the 2500t extruder through maximum discharging fabric width 330mm of the magnesium alloy pole behind thinning microstructure cooperates to be squeezed into semicircle or undaform arc; Concrete technical conditions are following:
1), the temperature when confirming to have second to separate out mutually in fusion temperature that the heating-up temperature of bar, the heating-up temperature of said ￠ 240 bars get magnesium alloy and the magnesium alloy between the temperature, 380～420 ℃ of temperature ranges;
2), confirm the magnesium alloy extrusion temperature, said magnesium alloy extrusion temperature comprises: temperature is 380～430 ℃ during mold work, recipient when work temperature is 280～320 ℃;
3), the temperature difference when reducing mould and contacting with blank, before the extruding mould is carried out preheating, when making extrusion blank put into mould, blank is lowered the temperature unlikely excessive and plasticity is reduced, the resistance of deformation increase; Can avoid simultaneously blank surface and central core excessive temperature differentials, unhomogeneity of deformation is increased, prevent the damage of extrusion and mould; The mold preheating temperature scope is set to 260～300 ℃, and promptly mould must be heated to the temperature lower slightly than blank;
D. the flattening of cylindrical shape or arc strip: adopt three roads to flatten one by one, first road adopts broadening formula preview flat-bed machine with the preliminary magnesium alloy arc that launches to obtain wide cut of arc strip; Second road adopts wide cut to flatten the magnesium alloy flat board that machine expands into the magnesium alloy arc strip of wide cut wide cut; The 3rd road adopt to flatten the polishing machine with the magnesium alloy flat board of wide cut with the smooth warm-rolling of 5% drafts, eliminate the extruding skid wire, obtain the magnesium alloy plate face of the thick wide cut 620cm of 2mm-4mm; Flatten, the magnesium alloy plate temperature of wide cut is greater than 230 ℃ during polishing, and each roll has the attemperating unit of regulating the heated roll temperature at any time;
E. the rolling of curling of the magnesium alloy plate through the wide cut 620cm of coiling machine after to light positive.
A kind of equipment of rolling production wide cut magnesium alloy plate; Comprise: multiaxis forging machine, extruder, flattening machine and winder; Said extruder, flattening machine and winder rearrange along magnesium alloy plate discharging axis, and extruder, flattening machine and winder are provided with the control system of synchronous working; Wherein be provided with the Extrusion Porthole Die for Aluminium Profiles tool of semicircular arc or undaform arc in the extruder; The arrival end of Extrusion Porthole Die for Aluminium Profiles tool is provided with the bar heater; Wherein the flattening machine is that three roads flatten equipment one by one, flattens polishing mechanism by the first road broadening formula preview flat-bed machine, the second road wide cut machine that flattens with the 3rd road and becomes; Described broadening formula preview flat-bed machine comprises camber roll, support body; The camber roll that is provided with on the said support body is made up of last camber roll and following camber roll; Have in order to regulate the adjusting clearance mechanism of camber roll and following camber roll relative spacing position, described adjusting clearance mechanism is made up of with the hoist cylinder that is fixed on support body is hinged rotating turret; The two ends of described rotating turret are hinged with support body, hoist cylinder respectively; The described camber roll of going up is connected on the described rotating turret; Described camber roll down links to each other with hydraulic motor through transmission mechanism; Said middle part of going up the camber roll is an arc-shaped concave, and the curved surface of described camber roll down and the curved surface kiss of last camber roll are joined, and the said camber roll of going up is an electrical heating camber roll with following camber roll; Said wide cut flattens facility has two to go up nip rolls and three following nip rolls; Described two last nip rolls lay respectively between three adjacent following nip rolls; Have the adjusting clearance mechanisms that are used to adjust two last nip rolls and three following nip rolls relative spacing positions, described adjusting clearance mechanism is made up of rotating turret and the hoist cylinder that is fixed on support body; The two ends of described rotating turret are hinged with support body, hoist cylinder respectively; Described two last nip rolls are connected on the described rotating turret; Described three following nip rolls are connected with power set through transmission mechanism.Two last nip rolls and three following nip rolls are electric heating roller; Two flat-rolls that said the 3rd road polishing flattens machine are electric heating roller.
A kind of equipment of rolling production wide cut magnesium alloy plate, the crimping roller of said winder is set to the electrical heating winding up roller.
A kind of wide cut magnesium alloy plate of production rolling, the magnesium alloy plate with the rectangular configuration that is curl shape, magnesium alloy plate width are 620mm, magnesium alloy plate thickness is 2mm-4mm.
Because adopt aforesaid technical scheme, the present invention has following superiority:
A kind of Processes and apparatus of rolling production wide cut magnesium alloy board; Be a kind of can be with the process units of the extrusion equipment rolling cogging wide cut magnesium alloy plate of little tonnage; It is to be the center with little tonnage extruder; Reach supporting mould, cambered surface roll flattening machine, and the camber line that utilizes point-to-point transmission reaches the purpose that increases fabric width forever than the principle of length through the flattening curved surface; Adopt and optimize reasonable technology: multiaxis forging, high-temperature aging, extruding and flattening temperature, rolling production exceed the wide cut magnesium alloy board of extruder outlet size.With the production of less investment, completion wide cut magnesium alloy board, and can the rolling supply of material.
Description of drawings
Fig. 1 is a mould structure sketch map of the present invention;
Fig. 2 is the sectional structural map of arc roll;
Fig. 3 is flat shape roll sectional structural map;
Fig. 4 is that the first road broadening formula preview flat-bed machine structure master cuts open sketch map;
Fig. 5 is that the side of Fig. 4 is cutd open sketch map;
Fig. 6 is that the second road wide cut flattening machine structure master cuts open sketch map;
Fig. 7 is that the side of Fig. 6 is cutd open sketch map;
Fig. 8 is that the 3rd road polishing flattens the machine structural representation.
Fig. 9 is the structural representation of 2500 tons of extruders;
Figure 10 is a process flow diagram of the present invention;
Figure 11 is the wide cut magnesium alloy plate structural representation that the present invention is curled;
Among the figure: 1. front beam, 2. mould chamber, 3. cutting mechanism, 4. ingot-containing tube, 5. upper rail, 6. the tension force post 7. supplies the ingot device; 8. piston carriage, 9. hydraulic system, 10. cooler, 11. fuel tanks, 12. main electric cabinets, 13. oil pumps; 14. pedestal, 15. prefill valves, 16. auxiliary oil cylinders, 17. master cylinders, 18. main plungers, 19. recipients; 20. guide rail, 21 die change cylinders, 22. moving-mold mechanisms, 23. locking cylinders, 24. bowed rollers, 25. wavy surface arcs; 26. electric heater, 27. flat-rolls, 28. hoist cylinders, 29. hydraulic motors, 30. hoist cylinders, the 31. wide cut magnesium alloy plates that curl.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Like Fig. 1,2,3,4,5,6,7,8,9,10, shown in 11: a kind of technology of rolling production wide cut magnesium alloy plate, be the as cast condition bar is stripped off the skin through milling face-multiaxis forges-machining-high-temperature aging-bar heats-extruding-flattening of little tonnage extruder-curl; Its step is following:
A. the magnesium alloy cast bar strips off the skin and removes surface casting cold shut layer through milling face; In 230 ° of C-350 ° C scope, carry out 5 passage multiaxises and forge, process ￠ 600 poles through machining;
B. ￠ 600 poles are carried out the thinning microstructure of 460 ° of C high-temperature agings again, improve the extrusion performance and the rolling performance of material; Make magnesium alloy materials through shrinkage porosite, shrinkage cavity, make the part crackle be eliminated the formation fibr tissue by seam, segregation; Make thick column crystal of part and dendritic crystal be transformed into tiny, uniform equiax crystal; Make and cooperate the cooled crystallization again of high-temperature aging to obtain the subgrain tissue; Under electron microscope, TEM tissue particles average out to d=0.8 μ m; Described ￠ 600 pole performances at room temperature, percentage elongation is 40%, hot strength is 450MPa; At 200 ° of C, percentage elongation is 500%, has the stability of high heat, adds man-hour, is difficult for taking place defective coarse, crackle;
The W shape arc Extrusion Porthole Die for Aluminium Profiles tool of the wide cut 620mm plate that c. is provided with in the 2500t extruder of the magnesium alloy pole behind thinning microstructure through maximum discharging fabric width 330mm cooperates to be squeezed into cylindrical shape or arc; Concrete technical conditions are following:
1, confirms the heating-up temperature of bar, the temperature when having second to separate out mutually in the fusion temperature that the heating-up temperature of said bar is got magnesium alloy and the magnesium alloy between the temperature, 380～420 ℃ of temperature ranges;
2, confirm the magnesium alloy extrusion temperature; Said magnesium alloy extrusion temperature comprises: the mold heated temperature is 380～430 ℃, and the recipient heating-up temperature is 280～320 ℃;
The temperature difference when 3, reducing mould and contact with blank is carried out preheating to mould before the extruding, and when making extrusion blank put into mould, blank is lowered the temperature unlikely excessive and plasticity is reduced, the resistance of deformation increase; Can avoid simultaneously blank surface and central core excessive temperature differentials, unhomogeneity of deformation is increased, prevent the damage of extrusion and mould; The mold preheating temperature scope is set to 260～300 ℃, and promptly mould must be heated to the temperature lower slightly than blank;
D. the flattening of cylindrical shape or arc strip: adopt three roads to flatten one by one, first road adopts two camber rolls to flatten machine with the preliminary magnesium alloy arc that launches to obtain wide cut of arc strip; Second road adopts five plain-barreled rolls to flatten the magnesium alloy flat board that machine expands into the magnesium alloy arc strip of wide cut wide cut; The 3rd road adopt two plain-barreled rolls flatten the polishing machine with the magnesium alloy flat board of wide cut with the smooth warm-rolling of 5% drafts, eliminate the extruding skid wire, obtain the magnesium alloy plate face of the thick wide cut 620cm of 2mm-4mm; Flatten, the magnesium alloy plate temperature of wide cut is greater than 230 ℃ during polishing, and each roll has the attemperating unit of regulating the heated roll temperature at any time;
E. the rolling of curling of the magnesium alloy plate through the wide cut 620cm of coiling machine after to light positive.
The wide cut magnesium alloy plate of the rolling of producing with little tonnage extruder, the plank frame with rectangle is the magnesium alloy plate of curl shape, and the magnesium alloy plate width is 620mm, and magnesium alloy plate thickness is 2mm-4mm.
A kind of equipment of rolling production wide cut magnesium alloy plate comprises: multiaxis forging machine, little tonnage extruder, flattening machine and winder; Little tonnage extruder by front beam 1, mould chamber 2, cutting mechanism 3, ingot-containing tube 4, upper rail 5, tension force post 6, supply ingot device 7, piston carriage 8, hydraulic system 9, cooler 10, fuel tank 11, main electric cabinet 12, oil pump 13, pedestal 14, prefill valve 15, auxiliary oil cylinder 16, master cylinder 17, main plunger 18, recipient 19, guide rail 20, die change cylinder 21, moving-mold mechanism 22, locking cylinder 23 to form, wherein be provided with W shape arc Extrusion Porthole Die for Aluminium Profiles tool in the extruder; There is the arrival end of W shape arc Extrusion Porthole Die for Aluminium Profiles tool to be provided with the bar heater; Wherein the flattening machine is that the three roads equipment that flattens one by one flattens machine by first road, two camber rolls flattening machine, second road, five plain-barreled rolls and the 3rd road two plain-barreled rolls flattening polishing mechanism becomes; Said extruder, flattening machine and winder rearrange along magnesium alloy plate discharging axis, and extruder, flattening machine and winder are provided with the control system of synchronous working;
Said W shape arc Extrusion Porthole Die for Aluminium Profiles is constituted by at least one group of W shape arc Extrusion Porthole Die for Aluminium Profiles plate; Every group of rondelle template by three band W shape arc-shaped cavity structures formed; Three rondelle templates are shunting seam chamber template, the wavy working face template of W type, strength support die-cushion template; As shown in Figure 1; W shape arc-shaped cavity in the shunting seam chamber template of front is wide than the wave width of the middle wavy working face template of W type cavity; W shape arc-shaped cavity in the strength support die-cushion template of back is the wave narrow width of the middle wavy working face template of W type cavity, and the cylindrical rod base through wide, in, the mould of narrow W shape arc-shaped cavity template composition, be squeezed into like the W shape arc in the cavity body of mould among Fig. 1.
Like Fig. 4, the first road broadening formula preview flat-bed machine shown in Figure 5, described broadening formula preview flat-bed machine comprises camber roll, support body; The camber roll that is provided with on the said support body is made up of last camber roll and following camber roll; Have in order to regulating the adjusting clearance mechanism of camber roll and following camber roll relative spacing position, described adjusting clearance mechanism is by rotating turret and be fixed on that the hoist cylinder 28 of support body is hinged to be constituted; The two ends of described rotating turret are hinged with support body, hoist cylinder 28 respectively; The described camber roll of going up is connected on the described rotating turret; Described camber roll down links to each other with hydraulic motor 29 through transmission mechanism; Said middle part of going up the camber roll is an arc-shaped concave, and the curved surface of described camber roll down and the curved surface kiss of last camber roll are joined, and the said camber roll of going up is an electrical heating camber roll with following camber roll.
Flatten machine like Fig. 6, the second road wide cut shown in Figure 7, said wide cut flattens facility has two to go up nip rolls and three following nip rolls; Described two last nip rolls lay respectively between three adjacent following nip rolls; Have the adjusting clearance mechanisms that are used to adjust two last nip rolls and three following nip rolls relative spacing positions, described adjusting clearance mechanism is made up of rotating turret and the hoist cylinder 30 that is fixed on support body; The two ends of described rotating turret are hinged with support body, hoist cylinder 30 respectively; Described two last nip rolls are connected on the described rotating turret; Described three following nip rolls are connected with power set through transmission mechanism.Two last nip rolls and three following nip rolls are electric heating roller.，
The 3rd road polishing as shown in Figure 8 flattens machine, and two flat-rolls are electric heating roller.
The structural representation of 2500 tons of extruders that Fig. 9 provides, described 2500 tons of extruders adopt the technical pattern of existing 2500 tons of extruders
Through the wide cut magnesium alloy plate that flattens polishing by rolling circumnutate song, rolling, packing, warehouse-in.Describedly curl, rolling technology and related winder adopt existingly curl, rolling technology and winder.Said winder crimping roller is the electrical heating winding up roller.
Said electrical heating camber roll, flat-roll are hollow roll, the interior arrangement electric heater, and attemperating unit is arranged, regulate roller temperature at any time
Be example with the AZ31 magnesium alloy below
At first, the magnesium alloy cast bar is removed surface casting cold shut, is processed into ￠ 600 poles, in 230 ° of C-350 ° C scope, carry out 5 passage multiaxises and forge, be processed to the cylindrical rod base of Ф 240mm.Forge in the process at multiaxis, make as cast metal form fibr tissue, shrinkage porosite, shrinkage cavity, crackle are by seam, and the part segregation is eliminated, and column crystal that part is thick and dendritic crystal are transformed into tiny, uniform equiax crystal.Cooperate the cooled crystallization again of high-temperature aging to obtain the subgrain tissue.
Carry out 460 ° of C high-temperature agings again, the magnesium alloy materials after the processing under electron microscope, the average d=0.8 μ of TEM tissue particles m.Its performance is:
1. under the room temperature, percentage elongation 40% and 450MPa hot strength; 200 ° of C, about 500% percentage elongation.
2. high hot stability.Add man-hour, be difficult for defectives such as generation is coarse, crackle.
The crystallite dimension of magnesium alloy cast bar material and shape have great influence to the extrusion performance and the rolling performance of sheet material.The characteristic of fine grained texture is that objectionable impurities more disperses, the brittle transition temperature of material reduces, the high temperature yield limit reduces.Therefore, thinning microstructure has improved the extrusion performance and the rolling performance of material.
Then, through W shape arc extrusion die, make about the about 400mm of design discharging opening full-size of 2500t extruder, the about 330mm of maximum discharging fabric width can realize obtaining the strip of fabric width 620mm.Earlier the cylindrical rod base is heated to 380 ° of C-420 ° C, delivers to the extruding of 2500t extruder, through the mould shown in Fig. 1, be squeezed into like cylindrical shape in the cavity body of mould among Fig. 1 or arc, i.e. wavy surface arc 25 shown in Fig. 2.Consider intensity and difficulty of processing, the disassembly, cleaning of extrusion die, the factor that repairs a die, therefore, the present invention has adopted W shape arc Extrusion Porthole Die for Aluminium Profiles tool.
Temperature when having second to separate out mutually in the extrusion process condition, the fusion temperature that from the magnesium alloy state diagram, can obtain certain magnesium alloy and alloy.So can obtain the extrusion temperature scope in these two temperature ranges, but this is a rough temperature range.In order to confirm the extrusion temperature scope of this kind magnesium alloy more accurately, need to the diagram of forgeability behaviour of this magnesium alloy and resistance of deformation figure and again crystallization figure analyze and research.It is the highest to obtain in certain temperature range its plasticity from the diagram of forgeability behaviour of magnesium alloy.So the heating-up temperature scope of blank can be chosen within this temperature range.The Mg-Al-Zn structural diagram is a primary foundation of confirming the magnesium alloy extrusion temperature.The fusion temperature of AZ31 is 603 ℃.Since 230 ℃, have second to separate out mutually in the alloy.Therefore, the extrusion temperature scope one of AZ31 fixes in 230～603 ℃ of scopes.Know that from the diagram of forgeability behaviour of AZ31 magnesium alloy plasticity is the highest in 350～400 ℃ temperature range.Blank heating temperature is 400 ℃ during extruding.
The magnesium alloy deformation temperature range is narrow, and thermal conductivity is good, runs into cold mould and can produce chilling and crack.So will carry out preheating to mould before the extruding, its effect is, the temperature difference when reducing mould and contacting with blank, blank is lowered the temperature unlikely excessive and make plasticity reduction, resistance of deformation increase when making extrusion blank put into mould; Can avoid simultaneously blank surface and central core excessive temperature differentials, unhomogeneity of deformation is increased, so that cause the damage of extrusion and mould.Because blank and mould contact surface are long-pending big, time of contact is long, and mould must be heated to the temperature lower slightly than blank, so the mold preheating temperature scope is 260～300 ℃.Temperature leak when considering extruding, the extrusion process that the present invention finally confirms: the bar heating-up temperature is 380～420 ℃, and the mold heated temperature is 380～430 ℃, and the recipient heating-up temperature is 280～320 ℃.
For being the flat board that the wavy surface arc 25 shown in Fig. 2 launches to obtain wide cut with cylindrical shape or arc arc smoothly, obtain magnesium alloy template preferably through curling, the present invention adopts three roads to flatten one by one.
First road adopts two camber rolls machine that flattens that the arc strip is tentatively launched: wavy surface arc 25 is flat by carry out preview like Fig. 4, the first road arc roller flattening machine shown in Figure 5, and it is as shown in Figure 2 that roller is pricked in flattening; Getting into second road subsequently flattens.
Second road adopts five plain-barreled rolls to flatten the machine arc that the preview that gets into is flat and expands into the magnesium alloy flat board; Flat-roll 27 is as shown in Figure 3, and five plain-barreled rolls flatten machine like Fig. 6, shown in 7, is surface quality and the template that guarantees that magnesium alloy is dull and stereotyped, gets into the 3rd road subsequently and flattens.
The 3rd road adopts and flattens the polishing machine is the polishing flat roll mill; As shown in Figure 8; Flat-roll 27 is as shown in Figure 3; The polishing flat roll mill carries out warm-rolling with 5% drafts to the magnesium alloy plate after flattening, band, eliminates the extruding slide mark on magnesium plate surface, finally reaches the qualified magnesium alloy plate of fabric width 620mm, surface quality and template.
After qualified magnesium alloy plate, the band behind the warm-rolling is curled into curling wide cut magnesium alloy plate 31 by crimping machine, have the magnesium alloy plate of the rectangular configuration that is curl shape, the magnesium alloy plate width is 620mm, and magnesium alloy plate thickness is 2mm-4mm.Through rolling, packing, warehouse-in.For guaranteeing the magnesium alloy plate quality, magnesium alloy plate is during flattening and warm-rolling, and magnesium alloy plate, band temperature will remain on 230 ° of C.For guaranteeing that the temperature of magnesium alloy plate in flattening the operation of rolling is not less than 230 ℃, roll is processed hollow roll, the interior arrangement electrical bar, and attemperating unit is arranged, regulate roller temperature at any time, with Mg supplementation plate thermal loss.
Claims (3)
1. the technology of a rolling production wide cut magnesium alloy plate is characterized in that: be the as cast condition bar is stripped off the skin through milling face-multiaxis forges-machining-high-temperature aging-bar heats-push-flatten-curl; Concrete steps are following:
A. the magnesium alloy cast bar strips off the skin and removes surface casting cold shut layer through milling face; In 230 ° of C-350 ° C scope, carry out 5 passage multiaxises and forge, process ￠ 600 poles through machining;
B. ￠ 600 poles are carried out the thinning microstructure of 460 ° of C high-temperature agings again, improve the extrusion performance and the rolling performance of material; Make magnesium alloy materials through shrinkage porosite, shrinkage cavity, make the part crackle be eliminated the formation fibr tissue by seam, segregation; Make thick column crystal of part and dendritic crystal be transformed into tiny, uniform equiax crystal; Make and cooperate the cooled crystallization again of high-temperature aging to obtain the subgrain tissue; Under electron microscope, TEM tissue particles average out to d=0.8 μ m; Described ￠ 600 pole performances at room temperature, percentage elongation is 40%, hot strength is 450MPa; At 200 ° of C, percentage elongation is 500%, has the stability of high heat, adds man-hour, is difficult for taking place defective coarse, crackle;
C. the wavy curved working face Extrusion Porthole Die for Aluminium Profiles tool of the wide cut 620mm plate that is processed to be provided with in ￠ 240 and the 2500t extruder through maximum discharging fabric width 330mm of the magnesium alloy pole behind thinning microstructure cooperates to be squeezed into semicircle or undaform arc; Concrete technical conditions are following:
1), the temperature when confirming to have second to separate out mutually in fusion temperature that the heating-up temperature of bar, the heating-up temperature of said ￠ 240 bars get magnesium alloy and the magnesium alloy between the temperature, 380～420 ℃ of temperature ranges;
2), confirm the magnesium alloy extrusion temperature, said magnesium alloy extrusion temperature comprises: temperature is 380～430 ℃ during mold work, recipient when work temperature is 280～320 ℃;
3), the temperature difference when reducing mould and contacting with blank, before the extruding mould is carried out preheating, when making extrusion blank put into mould, blank is lowered the temperature unlikely excessive and plasticity is reduced, the resistance of deformation increase; Can avoid simultaneously blank surface and central core excessive temperature differentials, unhomogeneity of deformation is increased, prevent the damage of extrusion and mould; The mold preheating temperature scope is set to 260～300 ℃, and promptly mould must be heated to the temperature lower slightly than blank;
D. the flattening of cylindrical shape or arc strip: adopt three roads to flatten one by one, first road adopts broadening formula preview flat-bed machine with the preliminary magnesium alloy arc that launches to obtain wide cut of arc strip; Second road adopts wide cut to flatten the magnesium alloy flat board that machine expands into the magnesium alloy arc strip of wide cut wide cut; The 3rd road adopt to flatten the polishing machine with the magnesium alloy flat board of wide cut with the smooth warm-rolling of 5% drafts, eliminate the extruding skid wire, obtain the magnesium alloy plate face of the thick wide cut 620cm of 2mm-4mm; Flatten, the magnesium alloy plate temperature of wide cut is greater than 230 ℃ during polishing, and each roll has the attemperating unit of regulating the heated roll temperature at any time;
E. the rolling of curling of the magnesium alloy plate through the wide cut 620cm of coiling machine after to light positive.
2. the equipment of a kind of rolling production wide cut magnesium alloy plate of technology according to claim 1; It is characterized in that: comprising: multiaxis forging machine, extruder, flattening machine and winder; Said extruder, flattening machine and winder rearrange along magnesium alloy plate discharging axis, and extruder, flattening machine and winder are provided with the control system of synchronous working; Wherein be provided with the Extrusion Porthole Die for Aluminium Profiles tool of semicircular arc or undaform arc in the extruder; The arrival end of Extrusion Porthole Die for Aluminium Profiles tool is provided with the bar heater; Wherein the flattening machine is that three roads flatten equipment one by one, flattens polishing mechanism by the first road broadening formula preview flat-bed machine, the second road wide cut machine that flattens with the 3rd road and becomes; Described broadening formula preview flat-bed machine comprises camber roll, support body; The camber roll that is provided with on the said support body is made up of last camber roll and following camber roll; Have in order to regulate the adjusting clearance mechanism of camber roll and following camber roll relative spacing position, described adjusting clearance mechanism is by rotating turret and the hinged formation of hoist cylinder (28) that is fixed on support body; The two ends of described rotating turret are hinged with support body, hoist cylinder (28) respectively; The described camber roll of going up is connected on the described rotating turret; Described camber roll down links to each other with hydraulic motor (29) through transmission mechanism; Said middle part of going up the camber roll is an arc-shaped concave, and the curved surface of described camber roll down and the curved surface kiss of last camber roll are joined, and the said camber roll of going up is an electrical heating camber roll with following camber roll; Said wide cut flattens facility has two to go up nip rolls and three following nip rolls; Described two last nip rolls lay respectively between three adjacent following nip rolls; Have the adjusting clearance mechanisms that are used to adjust two last nip rolls and three following nip rolls relative spacing positions, described adjusting clearance mechanism is made up of rotating turret and the hoist cylinder (30) that is fixed on support body; The two ends of described rotating turret are hinged with support body, hoist cylinder (30) respectively; Described two last nip rolls are connected on the described rotating turret; Described three following nip rolls are connected with power set through transmission mechanism, and two last nip rolls and three following nip rolls are electric heating roller; Two flat-rolls that said the 3rd road polishing flattens machine are electric heating roller.
3. the equipment of a kind of rolling production wide cut magnesium alloy plate as claimed in claim 2, it is characterized in that: the crimping roller of said winder is set to the electrical heating winding up roller.
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| CN201110404878.8A CN102489958B (en) | 2011-12-08 | 2011-12-08 | Process and equipment for manufacturing wide-width magnesium alloy plate in coils |
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| CN201110404878.8A CN102489958B (en) | 2011-12-08 | 2011-12-08 | Process and equipment for manufacturing wide-width magnesium alloy plate in coils |
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| CN107020306A (en) * | 2017-05-16 | 2017-08-08 | 大连康丰科技有限公司 | The metal plate and belt production method for being continuously extruded into U-shaped material and flattening online |
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| CN107214206A (en) * | 2017-06-09 | 2017-09-29 | 福建坤孚股份有限公司 | A kind of production method of high flatness wide cut magnesium sheet material |
| CN108787745A (en) * | 2017-04-26 | 2018-11-13 | 中国宝武钢铁集团有限公司 | A kind of production line of temperature control continuous rolling production magnesium-alloy material |
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| CN107214206A (en) * | 2017-06-09 | 2017-09-29 | 福建坤孚股份有限公司 | A kind of production method of high flatness wide cut magnesium sheet material |
| CN108817114A (en) * | 2018-04-17 | 2018-11-16 | 河南明镁镁业科技有限公司 | A kind of low cost improves the preparation method of magnesium alloy wide-width |
| CN111166083A (en) * | 2020-01-03 | 2020-05-19 | 佛山市索奥科技有限公司 | Aluminum profile and production method for producing large-width-section aluminum plate by using same |
| CN111166083B (en) * | 2020-01-03 | 2022-02-01 | 佛山市索奥科技有限公司 | Aluminum profile and production method for producing large-width-section aluminum plate by using same |
| CN112620371A (en) * | 2020-12-23 | 2021-04-09 | 太原理工大学 | Device and method for preparing fine-grain magnesium alloy through reciprocating torsion, extrusion and deformation |
| CN112620371B (en) * | 2020-12-23 | 2022-05-24 | 太原理工大学 | Device and method for preparing fine-grain magnesium alloy through reciprocating torsional extrusion deformation |
| CN114850218A (en) * | 2022-07-05 | 2022-08-05 | 太原理工大学 | Rolling device and method for high-bending-resistance stainless steel/bridge steel composite plate |
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