CN101850362A

CN101850362A - Ultrasonic external field continuous casting and rolling machine

Info

Publication number: CN101850362A
Application number: CN 201010202004
Authority: CN
Inventors: 胡仕成; 李晓谦; 毛大恒; 张立华
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2010-06-17
Filing date: 2010-06-17
Publication date: 2010-10-06

Abstract

The invention discloses an ultrasonic external field continuous casting and rolling machine, which comprises a casting mouth (11) and a roller support column (1). The roller support column (1) is provided with a cross beam (3). An ultrasonicator (8) is slantways mounted in front of the casting mouth (11) in the direction vertical to the casting and rolling direction. Guiding bars of the ultrasonicator (8) are inserted into the aluminium alloy fused masses of the casting mouth (11). The invention provides the ultrasonic external field continuous casting and rolling machine which can refine the casting and rolling mechanisms, improve mechanical property and anisotropy, reduce or eliminate segregation, macro-defects and micro-defects in the process of continuous casting and rolling of aluminium alloy plate blank. The machine is convenient for maintenance and can realize standardization and serialization.

Description

Ultrasonic external field continuous casting and rolling machine

Technical field

The present invention relates to a kind of casting and rolling device, particularly relate to the ultrasonic external field continuous casting and rolling machine of a kind of material forming and control.

Background technology

Aluminium and aluminium alloy made-up belt continuous casting and rolling method are subjected to the attention of countries in the world because of having advantages such as flow process weak point, reduced investment, energy-saving and cost-reducing, economic benefit height.The aluminium sheet band of producing with the continuous casting and rolling method has accounted for 70% of production at home at present, accounts for about 40% in the world.A cover surplus domestic continuous casting and rolling equipment has developed into 300.But conventional casting and rolling production process also is confined to 1 at present ^{* *}Series all, 3 ^{* *}Series and 8 ^{* *}The part of series, the deep drawability of continuous casting and rolling strip is starkly lower than the hot rolling cogging strip.Crystal grain is thicker, anisotropy and segregation seriously are the main causes that influences casting strip blank quality and range of application.

Grain size is the key factor of decision aluminum alloy strip performance, and industrial normal employing grain refiner can reach the one-level grain size at present, crystallite dimension is about 450 μ m, but fining agent cost height precipitates in strip casting process easily, makes casting plate quality instability, especially for high-purity aluminum foil, add grain refiner and can produce the alloy pollution, for the PS plate, fining agent brings segregation, surface corrosion is inhomogeneous, influences printing quality.Because the anisotropy of casting plate is more serious, earing rate is big, still can not produce pop can slab and Automobile Plate with conventional casting and roll process at present.Reduce the tensile strength that crystallite dimension helps improving the casting plate, help improving anisotropy simultaneously, reduce or eliminate segregation and grand, microdefect, the intensity of casting plate and plasticity are improved, the range of application of expansion casting plate.

Summary of the invention

Technical problem to be solved by this invention provides a kind of at aluminium alloy cast-rolled block continuous casting and rolling process energy refinement casting tissue, and the raising mechanical property is improved anisotropy, reduces or eliminate segregation and ultrasonic external field continuous casting and rolling machine grand, microdefect.

In order to solve the problems of the technologies described above, ultrasonic external field continuous casting and rolling machine provided by the invention, comprise lip and roll support post, on the roll support post, be provided with crossbeam, tilting in the described lip front end direction vertical with the casting direction is equipped with ultrasonic generator, and the importing bar of described ultrasonic generator inserts in the aluminium alloy melt of described lip.

Fixed cover is fixedly mounted on the described crossbeam, described fixed cover is hinged with connecting rod by screw thread rotation bearing pin and nut, adjusting screw one end is connected on the ring flange, the other end of described adjusting screw is connected on the connecting rod by adjusting screw nut, and described ultrasonic generator is fixedly mounted on the described ring flange.

Adopt the ultrasonic external field continuous casting and rolling machine of technique scheme, ultrasonic field is acted in the continuous casting and rolling process, ultrasonic field changes flow field and temperature field and hyperacoustic degasification to the cavitation of aluminium alloy melt and to the refining effect of crystal grain, when making crystal grain obtain refinement cast-rolled block organize more even, improve anisotropy, reduce or eliminate segregation and grand, microdefect, ultrasonic external field can carry out degassing processing and crystal grain thinning to aluminium alloy melt, significantly improve the tissue and the mechanical property of aluminium alloy casting product, regulate the angle of inclination and the importing degree of depth of the importing bar of ultrasonic generator simultaneously, obtain more casting-milling technology parameter coupling, but the present invention has enlarged the casting-rolling aluminum alloy variety range, has wide popularization and application and is worth.The present invention is easy to maintenance, can realize standardization and seriation.

In sum, the present invention is a kind of at aluminium alloy cast-rolled block continuous casting and rolling process energy refinement casting tissue, improve mechanical property, improve anisotropy, reduce or eliminate segregation and grand, microdefect and easy to maintenance, can realize the ultrasonic external field continuous casting and rolling machine of standardization and seriation.

Description of drawings

Fig. 1 is a ultrasonic external field casting schematic diagram;

Fig. 2 is a ultrasonic generator roll-setting gear schematic diagram;

Fig. 3 is a ultrasonic generator angle regulator schematic diagram.

The specific embodiment

The invention will be further described below in conjunction with the drawings and specific embodiments.

Referring to Fig. 1, Fig. 2 and Fig. 3, lip 11 is installed on the support body 16 by lip support panel 17, the front and back that preceding case 13 is installed on the support body 16 are adjusted on the platform 14, the preceding case push rod 15 of case 13 before acting on is installed on support body 16, be connected with passageway 12 between lip 11 and the preceding case 13, lip 11 exit correspondences are equipped with roll support post 1, roller 2 and crossbeam 3 are installed on roll support post 1, tilt in the lip 11 front ends direction vertical ultrasonic generator 8 is installed with the casting direction, the importing bar of ultrasonic generator 8 inserts in the aluminium alloy melt of lip 11, fixed cover 4 is installed on the crossbeam 3 and with the tight screw 6 of stopping by bolt 5 and fixes, fixed cover 4 is hinged with connecting rod 19 by screw thread rotation bearing pin 3 and nut 18, adjusting screw 9 one ends are welded on the ring flange 20, the other end of adjusting screw 9 is connected on the connecting rod 19 by adjusting screw nut 10, and ultrasonic generator 8 is fixedly mounted on the ring flange 20.

As shown in Figure 2, roll-setting gear of the present invention mainly is made up of connecting rod 19, ultrasonic generator 8, ring flange 20, adjusting screw 9 and adjusting screw nut 10.Adjusting screw 9 is welded on the ring flange 20, and adjusting screw 9 and adjusting screw nut 10 are fixed on ultrasonic generator 8 on the connecting rod 19.By twisting the importing degree of depth that adjusting screw nut 10 can be regulated the importing bar of ultrasonic generator 8.

As shown in Figure 3.Angle regulator of the present invention mainly is made up of fixed cover 4, connecting rod 19, screw thread rotation bearing pin 7 and nut 18, screw thread rotation bearing pin 7 connects together fixed cover 4 with nut 18 with connecting rod 19, fastening nut 18 can make it fix, unscrew nut 18, connecting rod 19 is rotated an angle around screw thread rotation bearing pin 7, at fastening nut 18, then the angle of inclination of the importing bar of ultrasonic generator 8 had just rotated an angle relatively in the past.

Ultrasonic external field continuous casting and rolling machine provided by the invention as shown in Figure 1, this device adds ultrasonic external field when the aluminium alloy continuous casting and rolling, ultrasonic cavitation effect and acoustic streaming effect are stirred aluminium alloy melt, in casting district aluminium alloy melt, produce forced convertion, increase the heat convection of melt, make the temperature field of melt be tending towards evenly reducing liquid point depth, the aluminum alloy solidification tissue is changed, simultaneously the crystal grain thinning tissue to equiax crystal from column crystal; Adopt angle regulator of the present invention and distance adjusting means can regulate ultrasonic generator 8 the importing bar the angle of inclination and import the degree of depth that rod guidance is gone into metal bath, being used in combination of two kinds of adjusting devices, can obtain the combination of the multiple angle of inclination and the degree of depth, but enlarge the purpose of casting alloy variety range.

As shown in Figure 1, the present invention is organically combined by ultrasonic transducer system and casting and rolling machine and forms.During work with ultrasonic generator 8 by being bolted on the ring flange 20, on the lip 11 front ends direction vertical, bore two holes (certain angle of inclination is arranged) with the casting direction, insert the importing bar of ultrasonic generator 8 in the aluminium alloy melt of lip 11 by two holes, the ultrasonic energy of going in the aluminium alloy melt by the importing rod guidance produces series of effects such as cavitation effect, ultrasonic vibration produces periodic tension and compression effect to aluminium alloy melt and makes the bubble formation cavitation of breaking, bubble breaks come-up and reaches degasification, localized hyperthermia's high pressure that cavitation effect produces can influence the forming core and the crystal growth process of aluminium alloy, thereby the process of setting that influences aluminium alloy makes crystal grain obtain refinement.Regulate the insertion depth and the angle of inclination of power and the frequency and the importing bar of ultrasonic generator 8, can realize the coupling of ultrasound parameter and casting-milling technology parameter.

The lip of corresponding device of the present invention and conventional casting and preceding case are connected in one, and be easy to use.The present invention improves on the basis to original electromagnetic casting rolling technology, has increased ultrasonic external field, the importing bar angle of inclination adjusting device of ultrasonic generator 8 and importing depth adjustment.The casting of ultrasonic wave aluminium is in the process of having finished in the extremely short time under the acting in conjunction of multiple factors such as ultrasonic field, temperature field, the field of force, flow field from the aluminum melt solidification and crystallization to aluminium sheet made-up belt roll forming, so the series of physical chemical change has taken place in the ultrasonic wave strip casting process.Wherein mainly contain cavitation effect and acoustic streaming effect, form in the growth process at the acoustic cavitation bubble, the evaporation meeting of the increase of cavitation bubble and internal liquid is from absorbing heat on every side, this will cause the temperature of the molten metal on cavitation bubble surface to reduce, cause local overcooling, therefore near formation nucleus cavitation bubble increases the nucleation rate of nucleus, and tissue obtains refinement; In cavitation bubble collapse process, the crystal that strong shock wave will smash primary crystal and grow up, and broken crystal is distributed in the melt under the stirring action of acoustic streaming once more, has improved living nuclear rate; The formed localized heat pulse of cavitation is the shock coagulation forward position constantly, and makes the local corrode in interface, and the high temperature that cavitation produces and the temperature rise of dendrite make dendrite fusing, have also increased the forming core number, thereby have increased number of dies; When ultrasonic wave when the liquid, can reduce liquid viscosity, make bubble floating and carry out degasification, remove the gaseous impurity that is mingled in the melt as much as possible.Under the acoustic streaming effect, crystal grain is broken, has restrained growing up of crystal grain, makes grain refinement, and crystal obtains even dispersion.Because strong reciprocation will take place for acoustic streaming and thermal convection current, accelerate mixing speed, this solidification kinetics to metal produces active influence.And under the acoustic streaming effect temperature field and the chemical composition homogenising of whole system, to the improvement of solidifying the back tissue certain effect will be arranged.Angle regulator and distance adjusting means can be regulated the angle of inclination and the importing degree of depth of the importing bar of ultrasonic generator 8, power by regulating ultrasonic generator 8 and frequency and the insertion depth and the angle of inclination that import bar can obtain the coupling of more ultrasound parameter and casting-milling technology parameter.

Claims

1. ultrasonic external field continuous casting and rolling machine, comprise lip (11) and roll support post (1), on roll support post (1), be provided with crossbeam (3), it is characterized in that: tilting in described lip (11) the front end direction vertical with the casting direction is equipped with ultrasonic generator (8), and the importing bar of described ultrasonic generator (8) inserts in the aluminium alloy melt of described lip (11).

2. ultrasonic external field continuous casting and rolling machine according to claim 1, it is characterized in that: fixed cover (4) is fixedly mounted on the described crossbeam (3), described fixed cover (4) is hinged with connecting rod (19) by screw thread rotation bearing pin (3) and nut (18), adjusting screw (9) one ends are connected on the ring flange (20), the other end of described adjusting screw (9) is connected on the connecting rod (19) by adjusting screw nut (10), and described ultrasonic generator (8) is fixedly mounted on the described ring flange (20).