CN105728462B - A kind of ultrasonic casting-rolling method of magnesium alloy slab - Google Patents

A kind of ultrasonic casting-rolling method of magnesium alloy slab Download PDF

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Publication number
CN105728462B
CN105728462B CN201610202213.1A CN201610202213A CN105728462B CN 105728462 B CN105728462 B CN 105728462B CN 201610202213 A CN201610202213 A CN 201610202213A CN 105728462 B CN105728462 B CN 105728462B
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roll
casting
ultrasonic
rolling
magnesium alloy
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CN105728462A (en
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翁文凭
李�一
周水
周一水
陆炀
周巍
盛敏奇
许继芳
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Suzhou University
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Suzhou University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels

Abstract

A kind of ultrasonic casting-rolling method of magnesium alloy slab, it comprises the following steps:Alloy melting, melt conveying, cast-rolled block, ultrasonic vibration, slab are batched, it is characterised in that:Ultrasonic probe is arranged in roll, and is equipped with ultrasonic probe in melt conveying side, top and bottom rolls positioned at roll casting zone.The present invention applies power ultrasonic probe in ring-type roll inwall, ultrasonic external field is directly acted on into casting and rolling solidified entity advanced position, power ultrasonic can be significantly improved to cast-rolled block structure refinement and the effect of homogenization, improve solute Distribution uniformity, strand metallurgical quality is improved;Original core of cast milling roller part is reduced, roll weight is significantly reduced, casting transmission energy expenditure can be mitigated;Water-cooling pattern is substituted using air cooling way, the risk for thoroughly avoiding roll sleeve rupture from causing magnesium liquid to meet water blast improves industrial production security.

Description

A kind of ultrasonic casting-rolling method of magnesium alloy slab
Technical field
The invention belongs to non-ferrous metals processing field, and in particular to a kind of ultrasonic casting-rolling method of magnesium alloy slab.
Background technology
Magnesium alloy has the advantages that high density light, specific strength and specific stiffness, electromagnetic shielding and damping capacity are good, it is military with Civil area all has a good application prospect, and high performance magnesium alloy board is increasingly subject to the attention in manufacture field.However, magnesium is closed Gold is Patterns for Close-Packed Hexagonal Crystal structure, and its symmetry is low, and bootable slip system is few at room temperature, and deformation processing is difficult, and traditional magnesium is closed Golden plate material preparation technology is more complicated, and processing cost remains high.Double-roller rolling technology has short route, low energy consumption and efficient Advantage, can significantly reduce magnesium alloy plate processing cost, be had a good application prospect in magnesium alloy plate manufacture field.
In recent years, α-Mg dendrite is discharged while growth to neighbouring liquid phase during research staff has found roll-casting of magnesium alloy The solute elements such as Al, Zn, cause solute to be enriched with the not solidified liquid phase in interdendritic, and primary crystal α-Mg are formed in interdendritic and are not advised Block Mg then17(Al, Zn)12The divorsed eutectic of phase composition, continuous casting billet structure forms flourishing cellular crystal along heat transfer direction.In addition, Solute element squeezes to strand centre in melt process of setting, easily forms center-line segregation, is unfavorable for follow-up rolling.Magnesium Alloy cast-rolled block exist tissue is thick and the problems such as component segregation, will necessarily limit roll-casting of magnesium alloy slab following process Energy.
Ultrasonic external field has significant beneficial effect to metal solidification texture, applies ultrasound during roll-casting of magnesium alloy outer , using acoustic cavitation and acoustic streaming benefit, promote forming core crystal grain thinning, and improve solute Distribution uniformity, improve magnesium alloy casting Roll slab tissue and homogeneity of ingredients.In current magnesium alloy ultrasound casting preparation method, ultrasound application is positioned over preceding case more the position Position is flowed through with lip melt, has an also segment distance apart from alloy melting liquid solidification front, when ultrasonic wave reaches solidification front, Significantly decay, it is difficult to give full play to effect that ultrasonic external field improves to roll-casting of magnesium alloy slab solidified structure.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention proposes a kind of ultrasonic casting-rolling method of magnesium alloy slab, changes tradition super Ultrasonic probe applies position in sound casting, is applied directly to roll casting zone solidification front position, effectively utilizes ultrasonic external field sound Cavitation and acoustic streaming benefit, significantly improve roll-casting of magnesium alloy slab institutional framework and component distributing, improve slab metallurgical quality, and carry The mechanical property of high finished product magnesium alloy plate.
The object of the invention is achieved through the following technical solutions:
Magnesium alloy slab ultrasound casting-rolling method, it comprises the following steps:Alloy melting, melt conveying, casting riser, ultrasound Vibration and slab are batched, it is characterised in that:Hollow roll is used in strip casting process, ultrasonic probe is arranged in roll, and Positioned at roll close to melt conveying side, to apply ultrasonic external field in melt solidification front.
Further, ultrasonic probe is applied to roll inwall, and roll is ring-type roll.
Further, ultrasonic generator power bracket is in 2-8kW, 25 ± 0.5kHZ of frequency.
Further, ultrasonic probe quantity carries out matching setting, ultrasonic probe quantity according to roller diameter and roll casting speed Scope is 2-6, and top and bottom rolls are symmetrical arranged.
Further, roller diameter scope 300-800mm, roll casting speed scope 1-3m/min.
Further, roll casting speed should be matched in casting, two turned on at any time in the range of roll casting zone solidification front Individual ultrasonic probe, inputs ultrasonic wave;In ultrasonic probe with roller rotational away from roll casting zone solidification front scope when, in time excision Ultrasonic wave is inputted.
Further, high-pressure gas medium is directly blown in roll by roll using hot-air pre-heating and cold front heavy rain mode Realize roller temperature control in surface.
Further, roller surface preheating temperature is to 150~300 DEG C before cast-rolled block, roller surface in strip casting process Temperature is cooled in the range of 250~350 DEG C.
Further, preheating gas provide thermal source by flame combustion, and cooling gas uses high pressure argon gas, nitrogen or titanium dioxide Carbon is used as the source of the gas for cooling down roll air cooling system.
Further, the casting-rolling method can prepare thickness 3-8mm, width 200-2000mm magnesium alloy strand.
By above-mentioned technological means, the present invention has the positive effect that:
(1) power ultrasonic applies position in roll inwall, and acoustic streaming can be done directly on before casting and rolling solidified entity with sound cavitation effect Edge, the SATT for greatly reducing case or lip position before original ultrasonic casting is acted on and producing;
(2) power ultrasonic applying mode of the present invention, can apply position according to technique adjustment ultrasonic probe and apply quantity, with Match a variety of alloy designations of roll-casting of magnesium alloy and casting blank specification change demand;
(3) ultrasonic probe is applied to casting and rolling solidified entity advanced position, and ultrasonic propagation distance can be greatly decreased, gives full play to Power acoustic cavitation and acoustic streaming benefit, reach crystal grain thinning, the purpose of non-uniform components distribution, improve strand metallurgical quality;
(4) using the preheating of roll gas and cooling system, former roll preheating and cooling device is substituted, strip casting process can be eliminated Central roll covers the hidden danger for rupturing leak and causing magnesium alloy fused mass heavy explosion, improves industrial production security;In addition air cooling equipment Intensity of cooling is lower with respect to water-cooling system, and the density of magnesium alloy is low, specific heat capacity is small and latent heat of solidification is small, and it is cold that casting blank solidification needs But intensity is far below other alloys, and the intensity of cooling of air cooling system can be with magnesium alloy materials thermophysical property matched well;
(5) roll removes roller core apparatus, and invalid heat scatters and disappears when can reduce roll preheating, can improve pre- in preheating The thermal efficiency, high-precision control roll preheating temperature;Casting roll weight is significantly reduced simultaneously, can be reduced in industrial strip casting process Reactance capacity consumption, it is cost-effective.
The magnesium alloy slab high yield rate prepared using the ultrasonic casting-rolling method of the present invention, good mechanical performance, tension is strong Degree is reached below 260~280MPa, 200~220MPa of yield strength, elongation percentage 15~20%, 10 μm of average grain size.
Brief description of the drawings
Fig. 1 is the schematic diagram of ultrasonic strip casting process of the invention.
Fig. 2 is ultrasonic casting and rolling machine ultrasonic probe applying mode schematic diagram.
Fig. 3 is roll preheating and cooling system schematic diagram.
Fig. 4 is ultrasonic generator and the schematic diagram of Probe arrangement mode.
Wherein:1- magnesium alloy liquations;2- rolls;3- ultrasonic probes;4- cast-rolled blocks;5- rolls are preheated and cooling system System;6- roll reinforcements;7- is preheated and cooling gas nozzle;8- preheating channel valves;9- cooling ducts valve;10- air blowers; 11- gas burners;12- Nitrogen Stations;13- power ultrasonic generating means.
Embodiment
The present invention is further elaborated below.
The ultrasonic casting-rolling method of the magnesium alloy slab of the present invention comprises the following steps:Alloy melting → melt conveying → casting is stood Plate → ultrasonic activation → strand is batched, and the requirement of each operation and parameter area are as follows:
(1) 680~700 DEG C of magnesium alloy fused mass pouring temperature;
(2) roll preheating temperature is 150~300 DEG C;
(3) ultrasonic generator power is set according to strand width, corresponding to rolling for 200~2000mm of roll surface width Roller, 2~8kW of ultrasonic power;Power ultrasonic frequency is 25 ± 0.5kHZ;
(4) top and bottom rolls ultrasonic wave applies probe number and set according to roll casting speed, corresponding to 1~3m/min of roll casting speed Scope, ultrasonic activation head is uniformly distributed along roll circumference direction;
(5) ultrasonic activation head in top and bottom rolls, starts vibration when entering roll casting zone solidification front, is leaving roll casting zone Afterwards, vibration is stopped;Diverse location vibration head apply vibration with stop vibration the moment, by roll rotation encoder carry out position with Track, the open and close of the head of control ultrasonic vibration in real time;
(6) 3~8mm of slab thickness, coiling temperature is 200~300 DEG C.
As shown in figure 1, the ultrasonic casting-rolling method of the magnesium alloy slab of the present invention, first with roll preheating and cooling system 5 In roll preheating function, to roller surface be blown high-temperature gas, roller temperature is preheated to zone of reasonableness;Then, magnesium alloy Liquation 1 is transported to the left side of roll 2 by conveying device, and the temperature in the operation of rolling of roll 2 can gradually rise;The roll of high temperature is to life The size of the magnesium alloy slab of production and show that performance is totally unfavorable, therefore roll preheating and cooling system 5 are switched into roll Refrigerating function module, is cooled down to roll 2, is directly blown with gases at high pressure on roll, takes away the surface heat of roll 2.
As shown in Fig. 2 roll thickness 30mm, in the collars inwall left and right sides and center setting structure reinforcement.It is super Sonic probe 3 applies position and is located at top and bottom rolls inwall, is symmetrically distributed in 1/4 and 3/4 position of cast-rolled block width.
Roll 2 is ring-type roll, and ultrasonic probe is applied to roll inwall.Ultrasonic probe quantity can be according to roller diameter size Set with roll casting speed.The roll quality of inner hollow mitigates, and the power consumption in industrial strip casting process can be reduced, while energy Enough improve the pre- thermal efficiency of roll.Roll thickness range 10mm---50mm, width range 200mm----2000mm.
As shown in figure 3, before casting, the preheating of roll 2 produces high-temperature gas using gas-fired, and air blast is blown to roll Surface, 150~300 DEG C of scopes are preheated to by roller temperature;In strip casting process, the cooling of roll 2 is rolled using high pressure nitrogen injection Roller surface is cooled down, and Nitrogen source gases are prepared using live Nitrogen Station, and roller surface temperature is cooled to 250~350 DEG C in strip casting process. Cooling gas can also be high pressure argon gas or high-pressure carbon dioxide gas.
As shown in figure 4, power ultrasonic generating means 13 is arranged on inside roll 2, each ultrasonic probe 3 in roll with Power ultrasonic generating means 13 is electrically connected.Ultrasonic power generating means 13 is by power supply, three portions of power generator and ultrasonic probe It is grouped into, ultrasonic probe applies position in ring-type roll inwall, applies quantity and position, technique can be coordinated to be adjusted.It is super Sonic probe 3 can set multiple according to roller diameter size and roll casting speed, preferably 4 to 6 ultrasonic probes.Match somebody with somebody during casting Roll casting speed is closed, probe input ultrasonic wave is opened in casting blank solidification advanced position, when probe positions are pivoted away from roll casting zone, cuts Disconnected Probe Ultrasonic Searching ripple input, is configured according to the speed of rolls to the open and-shut mode of ultrasonic probe 3, so that it is guaranteed that ultrasound is made For casting blank solidification forward position.
Above-mentioned means are only the preferable embodiments of the present invention, not make any formal limitation to the present invention, any ripe Those skilled in the art is known, without departing from the scope of the present invention, is made using the technology contents of the disclosure above Perhaps the equivalent embodiment of equivalent variations is changed or is modified to, as long as being the content without departing from technical solution of the present invention, according to this hair Any simple modification, equivalent variations and modification that bright technical spirit is made to above example, still fall within the technical program In the range of.

Claims (7)

1. a kind of ultrasonic casting-rolling method of magnesium alloy slab, it comprises the following steps:It is alloy melting, melt conveying, casting riser, super Acoustic vibration and slab are batched, it is characterised in that:Hollow roll is used in strip casting process, ultrasonic probe is arranged in roll, and And positioned at roll close to melt conveying side, to apply ultrasonic external field in melt solidification front;
Ultrasonic probe is applied to roll inwall, and roll is ring-type roll;
Roll casting speed should be matched in casting, the ultrasonic probe turned on at any time in the range of roll casting zone solidification front, input Ultrasonic wave;In ultrasonic probe with roller rotational away from roll casting zone solidification front scope when, in time excision ultrasonic wave input;
High-pressure gas medium is directly blown using hot-air pre-heating and cold front heavy rain mode and is realized roll temperature in roller surface by roll Degree control.
2. the ultrasonic casting-rolling method of magnesium alloy slab according to claim 1, it is characterised in that:Ultrasonic generator power Scope is in 2-8kW, 25 ± 0.5kHZ of frequency.
3. the ultrasonic casting-rolling method of magnesium alloy slab according to claim 1, it is characterised in that:Roll table before cast-rolled block Face preheating temperature is to 150~300 DEG C, and roller surface temperature is cooled in the range of 250~350 DEG C in strip casting process.
4. the ultrasonic casting-rolling method of magnesium alloy slab according to claim 1, it is characterised in that:Ultrasonic probe quantity is according to rolling Roller diameter carries out matching setting with roll casting speed, and ultrasonic probe quantitative range is 2-6, and top and bottom rolls are symmetrical arranged.
5. the ultrasonic casting-rolling method of magnesium alloy slab according to claim 1, it is characterised in that:Roller diameter scope 300- 800mm, roll casting speed scope 1-3m/min.
6. the ultrasonic casting-rolling method of magnesium alloy slab according to claim any one of 1-5, it is characterised in that:Preheating gas by Flame combustion provides thermal source, and cooling gas includes:High pressure argon gas, high pressure nitrogen or high-pressure carbon dioxide are air-cooled as cooling roll The source of the gas of system.
7. the ultrasonic casting-rolling method of magnesium alloy slab according to claim 6, it is characterised in that:Magnesium prepared by the casting-rolling method Aluminium alloy base includes following size range:Thickness 3-8mm, width 200-2000mm.
CN201610202213.1A 2016-04-01 2016-04-01 A kind of ultrasonic casting-rolling method of magnesium alloy slab Active CN105728462B (en)

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MX2016006520A (en) 2013-11-18 2016-09-06 Southwire Co Llc Ultrasonic probes with gas outlets for degassing of molten metals.
US9481031B2 (en) 2015-02-09 2016-11-01 Hans Tech, Llc Ultrasonic grain refining
US10233515B1 (en) 2015-08-14 2019-03-19 Southwire Company, Llc Metal treatment station for use with ultrasonic degassing system
DK3347150T3 (en) 2015-09-10 2020-11-09 Southwire Co Llc Ultrasonic grain processing and degassing device for metal casting
CN110947768B (en) * 2019-12-19 2021-02-19 合肥东方节能科技股份有限公司 Ultrasonic roller structure for rolling deformed steel bar
CN111647763A (en) * 2020-05-26 2020-09-11 东南大学 Continuous casting production method of AA3003 aluminum alloy plate

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