CN102430575B - Process and device for flattening W-like arc-shaped magnesium alloy blank plate - Google Patents

Process and device for flattening W-like arc-shaped magnesium alloy blank plate Download PDF

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Publication number
CN102430575B
CN102430575B CN201110404877.3A CN201110404877A CN102430575B CN 102430575 B CN102430575 B CN 102430575B CN 201110404877 A CN201110404877 A CN 201110404877A CN 102430575 B CN102430575 B CN 102430575B
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magnesium alloy
nip rolls
arc
flattening
roll
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CN201110404877.3A
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Chinese (zh)
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CN102430575A (en
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李跃华
胡明德
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李跃华
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/04Making uncoated products by direct extrusion
    • B21C23/06Making sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
    • B21C35/02Removing or drawing-off work
    • B21C35/023Work treatment directly following extrusion, e.g. further deformation or surface treatment

Abstract

The invention relates to the technical field of processing of novel nonferrous metal materials and discloses a process and device for flattening a W-like arc-shaped magnesium alloy blank plate. The process comprises the following step of: successively flattening the W-like arc-shaped plate for three times: (1) carrying out broadening by adopting a W-like gap constituted by two corresponding concave and convex arc-shaped rollers of an arc roller flattening machine; (2) obtaining a smooth magnesium alloy plate by adopting a five-roller flattening machine; and (3) carrying out smoothing and warm rolling with 5% of rolling reduction by adopting a finishing flattening machine to eliminate an extrusion slip line and obtaining a magnesium alloy plate surface with the thickness of 2mm-4mm and the broad width of 620mm by flattening. The device comprises a preliminary flattening machine, a flat plate flattening machine, the finishing flattening machine and a synchronous control system which are arranged along a discharge axial line of the magnesium alloy plate at an outlet of an extruding machine. According to the process and the device disclosed by the invention, a semi-finished product, namely the W-like arc-shaped magnesium alloy blank plate which is produced by a small-tonnage extruding machine, can be flattened, the purpose of increasing the breadth can be achieved by flattening the curved surface, and the flattening of the W-like arc-shaped magnesium alloy blank plate is realized. The process and the device disclosed by the invention have the characteristics of optimized process, reasonable equipment and low investment.

Description

A kind of technique of flattening W-like arc-shaped magnesium alloy blank plate and device
Technical field
The present invention relates to nonferrous materials processing technique field, relate in particular to a kind of technique and device of flattening W-like arc-shaped magnesium alloy blank plate.
Background technology
Magnesium is one of element the richest on the earth, in engineering application at present, is the metal material that quality (1.74g/cm3) is the lightest, specific strength is the highest, and compared with lightweight engineered plastics, magnesium alloy has higher elasticity and plastic deformation ability; Compared with aluminium alloy (2.8g/cm3), magnesium alloy is not only light, and anti-vibration and noise-reducing ability high, and there is very strong decay resistance, capability of electromagnetic shielding, shielding property, recovery utilization rate advantages of higher.Therefore, in the pillar industries such as communications and transportation (automobile), Aero-Space, letterpress, electronics (3C Product) and household electrical appliance, be desirable, the most practical lightweight structural material, be called as the green engineering material of tool development and application potentiality " 21 century ".
Magnesium alloy application form mainly contains cast magnesium alloy and wrought magnesium alloy.Wrought magnesium alloy is through pressure rolling, extruding, there is the advantages such as grain refinement, intensity is high, ductility is good, wherein magnesium alloy sheet is expected extensive use in the 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.Research and the application to automobile, motorcycle high-performance magnesium-alloy carried out in North America, Europe the earliest, the demand of magnesium alloy die casting and deformed magnesium alloy material is with the amplification rapid growth of annual 20% in recent years, and Japan has thrown huge fund and carried out research and the application to 3C Product magnesium alloy.
Compare with at present more ripe casting of magnesium alloy technology for making, the development of the Technology of Plastic Processing such as the forging of magnesium alloy, extruding, rolling, punching press and superplastic forming technology is relatively slow.
Present Domestic is produced two kinds of techniques of the general employing of magnesium alloy sheet outward:
1, finish rolling again after casting cogging: casting-milling technology parameter control difficulty, maturity is lower, and technical difficulty is higher.Should not realize package produces continuously.
2, finish rolling again after extrusion blooming, advantage is 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.Due to the restriction of be squeezed machine outlet size and extruding force, the general maximum of 2500t extruder cogging width can only reach 300 left and right, and large-tonnage extruder cost is very expensive.Because magnesium belongs to Patterns for Close-Packed Hexagonal Crystal structure, at room temperature only have a slide surface, on slide surface, there are 3 solid matter directions, so only have 3 slip systems under room temperature, it is moulding all lower than face-centered cubic and body-centered cubic.Under room temperature, the plasticity of magnesium alloy is poor, and distortion is difficult and be prone to deformation defect, and this has magnesium alloy self property to determine, is also the essential reason of restriction magnesium alloy machine-shaping.In extrusion process, material yield intensity is lower, and technology stability is higher; Yield tensile ratio is less, and extrusion performance is better.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 impact to the extrusion performance of sheet material.
As can be seen here, the high investment of process equipment and inefficient production, the low expensive high volume applications that limits high-performance magnesium-alloy rolled sheet metal causing of yield rate.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of this invention is to provide a kind of technique and device of flattening W-like arc-shaped magnesium alloy blank plate, can meet the needed mechanical property condition of rolling magnesium alloy plate, control template, realize the object of small extruding machine wide cut degree cogging with the extrusion die of brand new ideas and corollary equipment.
For achieving the above object, the present invention adopts following technical scheme:
A device for flattening W-like arc-shaped magnesium alloy blank plate, comprising: preliminary flattening machine, dull and stereotyped flattening machine, polishing flattening machine; The import of described preliminary flattening machine is positioned at 2500t extruder outlet place, and the preliminary outlet of flattening machine and the import of dull and stereotyped flattening machine are corresponding, dull and stereotyped flattening machine outlet corresponding with polishing flattening machine; Described preliminary flattening machine, dull and stereotyped flattening machine, polishing flattening machine are arranged in order along magnesium alloy plate discharging axis, and are provided with the control system of synchronous working.
A device for flattening W-like arc-shaped magnesium alloy blank plate, described device includes: preliminary flattening machine, dull and stereotyped flattening machine and polishing flattening machine; Described preliminary flattening machine includes: support body, camber roll; Camber roll comprises camber roll and lower camber roll; On described support body, be provided with the gap adjusting mechanism I for regulating upper camber roll and lower camber roll relative spacing position, described gap adjusting mechanism I is connected and composed by the rotating turret and the hoist cylinder I that are hinged on the upper camber roll on support body, the rotating turret two ends of going up camber roll are respectively with support body with to be fixed on hoist cylinder I on support body hinged, on upper camber roll and support body, between the lower camber roll of static state, be provided with certain interval, for the cambered surface spreading width of rolling magnesium alloy arc, and the thickness of adjustment rolling wavy surface arc; Lower camber roll on described support body is connected with hydraulic motor by transmission mechanism; Described upper camber roll is middle concave, the curve roll shape structure that both sides are protruding, the lower camber roll arranging on support body is for middle protruding, both sides recessed curve roll shape structure, and the curve of lower camber roll is corresponding with the curve of upper camber roll, described upper camber roll and lower camber roll are electrical heating camber roll; Described dull and stereotyped flattening machine has two upper nip rolls and three lower nip rolls; Two described upper nip rolls lay respectively between three adjacent lower nip rolls; Have the gap adjusting mechanism II for adjusting two upper nip rolls and three lower nip rolls relative spacing positions, described gap adjusting mechanism II is made up of rotating turret and the hoist cylinder II being fixed on support body; The two ends of described rotating turret are hinged with support body, hoist cylinder II respectively; Two described upper nip rolls are connected on described rotating turret; Three described lower nip rolls are connected with power set by transmission mechanism, and power set are motor; Five nip rolls are electrical heating nip rolls; Described polishing flattening machine is made up of the upper and lower level correspondence of two nip rolls arranging on support body, and the lower nip rolls of polishing flattening machine is connected with power set by transmission mechanism, and power set are motor; The described upper nip rolls of polishing flattening machine and lower nip rolls are electrical heating nip rolls.
Utilize the technique of the device flattening W-like arc-shaped magnesium alloy blank plate of above-mentioned flattening W-like arc-shaped magnesium alloy blank plate, described W shape arc-shaped magnesium alloy blank plate is that magnesium alloy pole obtains by 2500t extruder and the processing of W shape arc Extrusion Porthole Die for Aluminium Profiles tool, and its step is as follows:
A. first tentatively flattens, and adopts two corresponding concave, convex camber rolls, forms the W shape gap similar to W shape arc blanket, and the W shape arc blanket by gap between concave, convex camber roll is exerted pressure, and broadening obtains the magnesium alloy arc blanket of wide cut; The W shape arc blanket temperature of broadening process is controlled at 230 DEG C-280 DEG C by two corresponding electrical heating concave, convex camber rolls;
B. second is dull and stereotyped flattens, and adopts by two upper nip rolls and three dull and stereotyped flattening machines that lower nip rolls forms, and the wide magnesium alloy arc blanket that step a is obtained is exerted pressure, and flattens the smooth magnesium alloy blank plate that obtains wide cut; The wide magnesium alloy arc blanket temperature of broadening process is controlled at 230 DEG C-280 DEG C by five electrically heated nip rolls;
C. tri-road polishings flatten, adopt the polishing flattening machine being formed by two nip rolls setting up and down, the smooth magnesium alloy blank plate of the wide cut that step b is obtained is with 5% the smooth warm-rolling of drafts, eliminate extruding skid wire, the smooth magnesium alloy blank plate of wide cut is shown laid flat in to the magnesium alloy plate face of the wide cut 620mm that 20mm-40mm is thick; The smooth magnesium alloy blank plate temperature of the wide cut of broadening process is controlled at 230 DEG C-280 DEG C by two upper and lower corresponding electrical heating nip rolls.
Owing to adopting technical scheme as above, the present invention has following superiority:
A kind of technique of flattening W-like arc-shaped magnesium alloy blank plate and device, can flatten the semi-finished product W shape arc-shaped magnesium alloy blank plate that the extrusion equipment of little tonnage is produced, utilize the camber line of point-to-point transmission forever than the principle of length, reach by flattening curved surface the object that increases fabric width, realize the flattening of W shape arc-shaped magnesium alloy blank plate.Have process optimization, equipment is reasonable, invests little feature.
Brief description of the drawings
Fig. 1 is the sectional structural map of arc roll of the present invention;
Fig. 2 is flat shape roll sectional structural map;
Fig. 3 is the preliminary flattening machine front schematic view of first;
Fig. 4 is the preliminary flattening machine side schematic view of first;
Fig. 5 is the dull and stereotyped flattening machine front schematic view of second;
Fig. 6 is the dull and stereotyped flattening machine side schematic view of second;
Fig. 7 Shi tri-road polishing flattening machine schematic diagrames;
In figure: 1. arc roll, 2. wavy surface arc, 3. electrically heated rod, 4. support body, 5. hoist cylinder I, 6. hydraulic motor, 7. hoist cylinder II, 8. nip rolls.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Fig. 1,2,3,4,5,6,7: a kind of technique that flattens arc-shaped magnesium alloy blank plate, its step is as follows:
A. first tentatively flattens, and adopts two corresponding concave, convex camber rolls, forms the W shape gap similar to W shape arc blanket, and the W shape arc blanket by gap between it is exerted pressure, and broadening obtains the magnesium alloy arc blanket of wide cut; The W shape arc blanket temperature of broadening process is controlled at 230 DEG C-280 DEG C by two corresponding electrical heating concave, convex camber rolls;
B. second is dull and stereotyped flattens, adopt by two upper nip rolls and three alternate wide cut tabular gaps that form of lower nip rolls, wide magnesium alloy arc blanket to the broadening by gap between it is exerted pressure, and flattens the smooth magnesium alloy arc blanket that obtains wide cut; The wide magnesium alloy arc blanket temperature of broadening process is controlled at 230 DEG C-280 DEG C by five electrically heated nip rolls;
C. tri-road polishings flatten, adopt the corresponding thin plate gap forming of two levels, to the smooth magnesium alloy arc blanket of the wide cut by gap between it with 5% the smooth warm-rolling of drafts, eliminate extruding skid wire, the magnesium alloy plate of wide cut is shown laid flat in to the magnesium alloy plate face of the wide cut 620mm that 2mm-4mm is thick; The smooth magnesium alloy arc blanket temperature of the wide cut of broadening process is controlled at 230 DEG C-280 DEG C by two upper and lower corresponding electrical heating nip rolls;
As shown in Fig. 1,2,3,4,5,6,7: a kind of device of flattening W-like arc-shaped magnesium alloy blank plate, comprising: preliminary flattening machine, dull and stereotyped flattening machine, polishing flattening machine; The import of described preliminary flattening machine is positioned at 2500t extruder outlet place, and the preliminary outlet of flattening machine and the import of dull and stereotyped flattening machine are corresponding, dull and stereotyped flattening machine outlet corresponding with polishing flattening machine; Described preliminary flattening machine, dull and stereotyped flattening machine, polishing flattening machine are arranged in order along magnesium alloy plate discharging axis, are provided with the control system of synchronous working.
A kind of device of flattening W-like arc-shaped magnesium alloy blank plate, as Fig. 3, shown in Fig. 4, described preliminary flattening machine comprises: support body, camber roll 1, camber roll 1 is made up of upper camber roll and lower camber roll, on described support body 4, be provided with the gap adjusting mechanism I for regulating upper camber roll and lower camber roll relative spacing position, described gap adjusting mechanism I is connected with hoist cylinder I 5 by the rotating turret of the upper camber roll that is hinged on support body, the rotating turret two ends of going up camber roll are respectively with support body 4 with to be fixed on hoist cylinder I 5 on support body hinged, on upper camber roll and support body, between the lower camber roll of static state, be provided with certain interval, for the cambered surface spreading width of rolling magnesium alloy arc 2, and the thickness of adjustment rolling wavy surface arc 2.
Lower camber roll on described support body 4 is connected with hydraulic motor 6 by transmission mechanism.Described upper camber roll is middle concave, the curve roll shape structure that both sides are protruding, the lower camber roll arranging on support body 4 is middle protruding, both sides recessed curve roll shape structure, and the curve of lower camber roll is corresponding with the curve of upper camber roll, described upper camber roll and lower camber roll are electrical heating camber roll.
As shown in Figure 5, Figure 6, described dull and stereotyped flattening machine has two upper nip rolls and three lower nip rolls; Two described upper nip rolls lay respectively between three adjacent lower nip rolls; Have the adjusting gap adjusting mechanism II for adjusting two upper nip rolls and three lower nip rolls relative spacing positions, described gap adjusting mechanism II is made up of rotating turret and the hoist cylinder II 7 that is fixed on support body; The two ends of described rotating turret are hinged with support body, hoist cylinder II 7 respectively; Two described upper nip rolls are connected on described rotating turret; Three described lower nip rolls are connected with power set by transmission mechanism.Five nip rolls are electrical heating nip rolls.
Described polishing flattening machine is made up of the upper and lower level correspondence of two nip rolls arranging on support body, and lower nip rolls is connected with power set by transmission mechanism, and power set are motor; Described upper nip rolls and lower nip rolls are electrical heating nip rolls.
Described camber roll 1, flat-roll 8 are hollow roll, interior arrangement electrically heated rod 3, and have attemperating unit to regulate at any time roller temperature.
Below taking AZ31 magnesium alloy as example
Magnesium alloy cast billet carries out 5 passage multiaxises and forges within the scope of 230 ° of C-350 ° C, and the billet after forging, after 460 ° of C high-temperature agings are processed, is processed to the cylindrical rod base of Ф 240mm.Cylindrical rod base is heated to 380 ° of C-420 ° C, delivers to the extruding of 2500t extruder, is squeezed into magnesium alloy arc 2 by extrusion die.
Before smoothly arc strip being expanded into flat board, obtain good template, the present invention adopts three roads successively to flatten.First arc roller flattening machine flattens in advance, and magnesium alloy arc 2 is flattened in advance by the preliminary flattening machine of first as shown in Figure 3, Figure 4, flattens and pricks roller as shown in Figure 1; Enter subsequently the dull and stereotyped flattening machine of second, as shown in Figure 5, Figure 6, be launched into magnesium alloy plate, band.Flat pattern is pricked roll structure as shown in Figure 2; For ensureing surface quality and the template of flat board or band, San road polishing flattening machine as shown in Figure 5, flat pattern roll structure as shown in Figure 2, polishing flattening machine carries out warm-rolling with 5% drafts to the magnesium alloy plate after flattening, can significantly eliminate the extruding slide mark on magnesium plate surface, finally reach the magnesium alloy plate that fabric width 620mm, surface quality and template are qualified, obtain the plate face that is satisfied with.For ensureing magnesium alloy plate quality, magnesium alloy plate is during flattening and warm-rolling, temperature will remain on 230 ° of C, for ensureing that magnesium alloy plate is at the temperature conditions flattening in the operation of rolling, roll is made hollow roll, interior arrangement electrical bar 3, and have attemperating unit, regulate at any time roller temperature, with Mg supplementation plate thermal loss.

Claims (2)

1. a device for flattening W-like arc-shaped magnesium alloy blank plate, is characterized in that: described device includes: preliminary flattening machine, dull and stereotyped flattening machine and polishing flattening machine, described preliminary flattening machine includes: support body (4), camber roll, camber roll comprises camber roll and lower camber roll, on described support body (4), be provided with the gap adjusting mechanism I for regulating upper camber roll and lower camber roll relative spacing position, described gap adjusting mechanism I is connected and composed by the rotating turret and the hoist cylinder I (5) that are hinged on the upper camber roll on support body, the rotating turret two ends of going up camber roll are respectively with support body (4) with to be fixed on hoist cylinder I (5) on support body hinged, on upper camber roll and support body, between the lower camber roll of static state, be provided with certain interval, for the cambered surface spreading width of rolling magnesium alloy arc (2), and the thickness of adjustment rolling wavy surface arc (2), lower camber roll on described support body (4) is connected with hydraulic motor (6) by transmission mechanism, described upper camber roll is middle concave, the curve roll shape structure that both sides are protruding, the upper lower camber roll arranging of support body (4) is middle protruding, both sides recessed curve roll shape structure, and the curve of lower camber roll is corresponding with the curve of upper camber roll, described upper camber roll and lower camber roll are electrical heating camber roll, described dull and stereotyped flattening machine has two upper nip rolls and three lower nip rolls, two described upper nip rolls lay respectively between three adjacent lower nip rolls, have the gap adjusting mechanism II for adjusting two upper nip rolls and three lower nip rolls relative spacing positions, described gap adjusting mechanism II is by rotating turret and be fixed on hoist cylinder II (7) formation on support body, the two ends of described rotating turret are hinged with support body, hoist cylinder II (7) respectively, two described upper nip rolls are connected on described rotating turret, three described lower nip rolls are connected with power set by transmission mechanism, and power set are motor, five nip rolls are electrical heating nip rolls, described polishing flattening machine is made up of the upper and lower level correspondence of two nip rolls arranging on support body, and the lower nip rolls of polishing flattening machine is connected with power set by transmission mechanism, and power set are motor, the described upper nip rolls of polishing flattening machine and lower nip rolls are electrical heating nip rolls.
2. the technique of utilizing the device flattening W-like arc-shaped magnesium alloy blank plate of a kind of flattening W-like arc-shaped magnesium alloy blank plate described in claim 1, is characterized in that: its step is as follows:
A. first tentatively flattens, and adopts two corresponding concave, convex camber rolls, forms the W shape gap similar to W shape arc blanket, and the W shape arc blanket by gap between concave, convex camber roll is exerted pressure, and broadening obtains the magnesium alloy arc blanket of wide cut; The W shape arc blanket temperature of broadening process is controlled at 230 DEG C-280 DEG C by two corresponding electrical heating concave, convex camber rolls;
B. second is dull and stereotyped flattens, and adopts by two upper nip rolls and three dull and stereotyped flattening machines that lower nip rolls forms, and the wide magnesium alloy arc blanket that step a is obtained is exerted pressure, and flattens the smooth magnesium alloy blank plate that obtains wide cut; The wide magnesium alloy arc blanket temperature of broadening process is controlled at 230 DEG C-280 DEG C by five electrically heated nip rolls;
C. tri-road polishings flatten, adopt the polishing flattening machine being formed by two nip rolls setting up and down, the smooth magnesium alloy blank plate of the wide cut that step b is obtained is with 5% the smooth warm-rolling of drafts, eliminate extruding skid wire, the smooth magnesium alloy blank plate of wide cut is shown laid flat in to the magnesium alloy plate face of the wide cut 620mm that 20mm-40mm is thick; The smooth magnesium alloy blank plate temperature of the wide cut of broadening process is controlled at 230 DEG C-280 DEG C by two upper and lower corresponding electrical heating nip rolls.
CN201110404877.3A 2011-12-08 2011-12-08 Process and device for flattening W-like arc-shaped magnesium alloy blank plate CN102430575B (en)

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CN103008377B (en) * 2012-12-21 2015-10-07 重庆市科学技术研究院 A kind of novel magnesium alloy plate extruding formation process
CN103212572B (en) * 2013-04-17 2015-04-29 燕山大学 Method for rolling magnesium alloy plate
CN105268744B (en) * 2015-11-23 2017-05-31 东北大学 A kind of roller system of rolling mill and flattening milling method for flattening metal shaped piece
CN106426895B (en) * 2016-09-29 2019-06-11 铜陵市超越电子有限公司 A kind of metallized film nip rolls
CN107282685A (en) * 2017-06-09 2017-10-24 福建坤孚股份有限公司 A kind of production method of short route light sheet
CN108067501B (en) * 2017-11-07 2019-04-19 东北大学 Operation roll of mill curve design method suitable for bloom and the big pressure of rectangular bloom high temperature
CN109332387A (en) * 2018-09-30 2019-02-15 日照钢铁控股集团有限公司 It is a kind of to prevent the planisher of shape wave and production system and production method among thin gauge hot rolling acid-cleaning formation plate

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