CN1013936B - Continuous metal tube casting method, apparatus and product - Google Patents

Abstract

Liquid metal is led into the lower part of an annular crystallizer, and compact and homogeneous long tubular metal products, such as metal tubes, etc. can be continuously cast. The liquid metal is pulled under the conditions of at least one extended upwards travelling alternating electromagnetic levitation field and an auxiliary electromagnetic control force field so that the tubular liquid metal is basically in an agravic and zero-pressure state when the liquid metal is solidified. The solidified tubular metal products are pulled out from the upper part of the magnetic field, cooled and further processed into the desired final products.

Description

Continuous metal tube casting method, apparatus and product

The present invention relates to a kind of new improvement method, equipment and the final products of tubular metal product such as continuous casting of metal pipe.

Or rather, the present invention relates to a kind of method that under the situation that the electromagnetic suspension field of force is arranged, casts long tubular metal product such as metal tube continuously.Under the situation that the electromagnetic suspension field of force is arranged, cast, can make the gravity, frictional force and the adhesion strength that act on the liquid metal cast tube product reduce to minimum, and make the tubulose liquid metal of product in process of setting and the heat exchanger effectiveness between the heat exchanger keep maximum.

In the past, the tubular metal product that occurs with forms such as metal tubes is to produce with the various technology in being cast in that comprise.These technology have been done detailed explanation in the document of the relevant this respect technology of having published.For example, the United States Patent (USP) № 4 of promulgation on June 23rd, 1981,274,470 first hurdle and second hurdle about the description of prior art in just narrated and be applicable to the electromagnetic casting device of producing tubular metal product such as metal tube, and the some patents and the technical literature of prior art, and the shortcoming of these prior arts has been discussed.What be put into these prior arts has a United States Patent (USP) № 3,476,166(inventor Getselev), United States Patent (USP) № 3,605,865(inventor Getselev), United States Patent (USP) № 3,735,799(inventor Karlson), United States Patent (USP) № 4,014,379(inventor Getselev) and United States Patent (USP) № 4,126,175(inventor Getselev).Above-mentioned these patents relate to the use electromagnetic crystallizer, have in it one in given size with interior liquid phase pond, when the liquid phase pond moved down, the part of liquid phase pond lateral magnification was outside solidified gradually.Adopt this method, the growth of cakey metal extends longitudinally, and if relied on gravity flow liquid metal will semi-continuously or continuously be transported to the metal base that the formation that descending solidifies metal liquid phase pond above.One of comparison important disadvantages of this method is the characteristic of the direct casting technology known to not having in the past " fault secure " that had, therefore, just in case the power failure that generation does not reckon with etc., liquid metal may overflow the metal liquid phase pond that is moving down, rather than resembles and only flow back to the direct casting system.In addition, in these following casting technology, excessive and the possibility of overflowing out of liquid metal flow, require carefully to control the speed that liquid metal sends into and the translational speed of cakey strand always, and these two kinds of speed all are subjected to strict restriction because of the heat exchange problem, and this has reduced this continuous casing possibility for commercial applications.

Transfer the United States Patent (USP) № 3,746 of the Outokumpo Oy of Finland, 077(inventor Lohikoski etc.) and United States Patent (USP) № 3,872,913(inventor Lohikoshi) a kind of direct casting technology proposed.The characteristics that adopt this technology are that the new liquid metal that forms upwards is pressed into by hydrostatic pressure or is upwards sucked in an opening, vertically arranged, the mechanical type crystallizer by pull of vacuum.Adopt this method, chilled cast article disengages and shifts out with the upper end of mechanical type crystallizer intermittently, and liquid metal is sent in the mechanical type crystallizer continuously.This system has the characteristic of desirable direct casting technology " fault secure ", but this point is with the heavy wear of the mechanical type crystallizer that contacted and tears to be cost.Therefore, this system is continuously with semicontinuous operation the time, and the mechanical type crystallizer was just ground away in very short time.So need a kind of continuous casting system of improved tubular metal product, to overcome the shortcoming of existing electromagnetic casting system.

The Japan Patent spy opens continuous casing and the equipment thereof that clear 57-127550 has proposed a kind of metal tube.

In this equipment, used the U-shaped tubular container.From an end of U-shaped pipe liquid metal material is introduced container, and upwards shift out from the tubular metal that the other end of pipe will solidify.Wherein, the liquid metal post is subjected to the centrifugal force that applied by the rotating electromagnetic place that induction coil (Fig. 1) produces at the other end of described pipe, thereby forms metal tube.Yet in this method, since be subjected to pressure at the tubulose liquid metal of the other end of described pipe towards the cast tube inner surface, therefore, if on its interface, do not add fluent material, for example be used to the rape seed oil that lubricates, just can not pull out the metal tube that has solidified.

Therefore, main purpose of the present invention provides a kind of new, that improved, that be used to make tubular metal product such as continuous, long metal pipe continuous casing and equipment, and this method and apparatus has overcome above-mentioned known and the existing shortcoming and defect of foundry engieering applied continuous tubular metal product and system.

Characteristics of the present invention provide a kind of improved under the situation that an electromagnetic suspension field of force that moves up is arranged, make the method and apparatus of tubular metal product such as long metal pipe continuously.The electromagnetic suspension field of force that moves up makes to act on gravity, frictional force and adhesion strength casting, on the tubular metal product and reduce to minimum, simultaneously, makes the tubular metal product of solidifying and the efficient of the heat exchange between the heat exchanger keep maximum.

Implement the method and apparatus of producing long tubular metal product provided by the invention, the device that comprises the electromagnetic suspension field of force of, an alternation extension, that move up, and the device that forms its direction Electromagnetic Control power another arena vertical with the field of force that upwards suspends, common extension in order to form in the inside of annular cast container.In addition, the present invention also provides the device that forms second electromagnetic force field, so that form one second Electromagnetic Control power another arena at least, its action direction is opposite with the direction of the aforementioned first Electromagnetic Control power another arena in annular cast container intermediate range.Liquid metal is admitted in the bottom and electromagnetic field of annular cast container, to form tubulose liquid metal post.The size of setting up by suitable method that acts on the electromagnetic suspension field of force on the tubulose liquid metal post makes the metal column hydrostatic pressure difference reduce to minimum, and the predetermined size relationship of maintenance between the relative inner peripheral surface of the surfaces externally and internally that makes tubulose liquid metal post and annular cast container.Act on the electromagnetic field on the tubulose liquid metal post, the cross dimension that should make tubulose liquid metal post is even as big as realizing no pressure contact, but prevent between the relative inner circumferential surface of surfaces externally and internally of tubulose liquid metal post, to form real gap again with the annular cast container, thereby, realize that no pressure contacts and obtain maximum thermal exchange between tubulose liquid metal post and the casting container, simultaneously, gravity, frictional force and adhesion strength are reduced to minimum.Tubulose liquid metal post is subjected to suspending power and solidifies in solidification zone in the solidification zone that heat exchanger surrounded, move up simultaneously, by the casting container after coagulation tubular metal product shift out from the top of casting container.

When continuous casting, liquid metal is sent into the bottom of casting container continuously, and cakey tubular metal goods shift out from the top of casting container continuously with its speed of production.The tubular metal goods are determined by the translational speed of controlling the cakey tubular metal goods that shift out from casting container top and the speed that corresponding liquid metal is sent into casting container from speed of production.

In the embodiment that the present invention recommends, the second Electromagnetic Control branch field of force generation device is to be produced by the second electromagnetic suspension field of force generation device that moves up that is arranged in the annular cast container center hole.

When casting process begins, a starting metal tube links to each other with the tubulose liquid metal post that moves up by the suspension field of force, and they are to cool off and be solidified to the lower end of starting metal tube by the upper end that makes the tubulose liquid metal post in the suspension field of force to connect together.The invention provides and will start the device that riser and the tubular metal product of having solidified attached to it are upwards drawn with a certain speed, this speed has determined the productivity ratio of tubular metal product.Just carry out pre-cooledly after being exposed from casting container top by the tubular metal goods that drawn, subsequently, if necessary, be rolled into desired final finished on the spot, and be cooled to environment temperature.If what casting was come out is exactly desired size, so, after the tubular metal goods expose from casting container top, just carry out pre-cooledly, then, further be cooled to environment temperature and store.

After having read being described in detail of back, connect consideration with accompanying drawing again, the present invention just there has been clearer understanding, just than being easier to estimate purpose of the present invention, feature and many advantages of following.In the accompanying drawings, identical part all uses same label to represent among each figure.

Fig. 1 be according to new improvement of the present invention the partial structurtes sketch of tubular metal product Casting Equipment.Marked the strength member of this equipment on the figure and the correlation between them when making tubular metal product.

Fig. 2 is by method of the present invention and has adopted the block diagram of the whole continuous casting system of equipment shown in Figure 1.

Serve as United States Patent (USP) № 4 that topic deliver with " method of continuous casting of metal, equipment and product " November 8 nineteen eighty-three, 414,285(inventor Hugh R.Lowry and Robert.T.Frogt, transferred General Electric Co. Limited), proposed method, equipment and the product of the long fine and close homogeneous solid metal bar of a kind of new continuous casting, this method is liquid metal to be sent into the bottom of casting container under the situation of the alternate electromagnetic floatage field that moves up that extension is arranged.The present invention is a kind of improvement to patent № 4,414,285, has proposed a kind of principle patent № 4,414,285 and has expanded the method and apparatus of producing tubular metal product such as metal tube to.

Fig. 1 is that being applicable to according to the principle of the present invention and United States Patent (USP) № 4,414,285 of having improved produced the device structure sketch of long tubular metal product continuously.Equipment shown in Figure 1 has the liquid metal storage tank 10 of an annular, and liquid metal is sent to storage tank, comes out from storage tank in tubular metal product such as metal tube processing back.Much less, the liquid metal storage tank has suitable refractory material lining and makes metal keep liquid heating element heater.

Annular cast container/heat exchanger 11 is installed in the upper end of storage tank 10, and the former annular internal channel aligns with the hole of liquid metals storage tank 10 top respective shapes, and communicates.

Annular cast container/heat exchanger 11 has a columniform ceramic coat 12, and overcoat 12 puts in the circular passage on storage tank 10 tops, and supports thereon.Shape is installed on centre bores 14 tops of annular liquid metal storage tank 10 as cover 13 in the pottery of the cup put upside down, the annular cast container that the sidewall of cover 13 and cylinder ceramic coat 12 have constituted an extension jointly in the cup-shaped pottery, the liquid metal in the storage tank 10 promptly is frozen into tubular metal product such as desirable metal tube in this casting container.

Circular heat exchanger 15 is installed in around the ceramic coat 12, be located immediately at liquid metal storage tank 10 above, the shown in Figure 3 with illustrated heat converter structure of it and United States Patent (USP) № 4,414,285 is identical, working method is also identical, comes from this patent transplanting.Cooling water is by the inlet inflow heat exchanger 15 shown in the arrow 16, and hot water is from the outlet outflow heat exchanger shown in the arrow 17.An auxiliary interior heat exchanger 18 nestles up the inner surface of cover 13 in the ring-shaped pottery, the heat of cover 13 in being used to take away.Interior heat exchanger 18 has a top header 18A, and it nestles up the bottom surface of the cup-shaped pottery of putting upside down, and supplies with cooling water, and cooling water is downward through upright sidepiece 18B downwards.18B contacts with the column part of the interior cover 13 of the cup-shaped pottery of putting upside down, takes away its heat.The periphery and the cylindrical ceramic overcoat 12 of interior cover 13 have constituted the annular cast container jointly, and tubular metal product is shaped in the annular cast container.The top header 18A of heat exchanger 18 in cooling water flows into by center water inlet pipe 18C, then with the shunting of the direction shown in arrow 19 and 21, upright the sidepiece 18B of heat exchanger 18 in flowing into downwards.Heat exchanger 18 in whole is installed in centre bore 14 the insides of annular liquid metal storage tank 10 with suitable support (not shown), therefore, proper should be that cooling water is as shown in arrow 19 flows to interior heat exchanger by center water inlet pipe 18C, through top header 18A, flow out through upright downwards cup-shaped sidepiece 18B and outlet pipe 18D then, drainpipe 18D discharges the water among the sidepiece 18B by shown in the draining arrow 21.

A multicircuit winding 22 is pressed mode shown in Figure 1 on the outer wall of outer heat-exchanger 15.Multicircuit winding 22 for example can be made up of 12 circle coils in the space that is installed in around the ceramic coat 12, and make the axis approximate vertical of the mounting plane and the ceramic jacket 12 of each winding.Coil in the multicircuit winding 22 can be divided into three groups, receives different the going up mutually of polyphase source shown in Figure 2, produces an electromagnetic suspension field of force that moves up, this United States Patent (USP) of quoting in front 4, in 414,285, particularly done explanation more fully in its part relevant with Fig. 3.

Multicircuit winding 23 and multicircuit winding 22 are somewhat similar, and it is made up of each coil that is installed in the multicircuit winding on the plane vertical with the central shaft of cover 13 in the cup-shaped pottery of putting upside down.The coil of winding 23 is in the inner surface of the 18B of the cup-shaped interior heat exchanger of putting upside down 18.Electric current flows into multicircuit winding 23 through supply lines 24.Inner multicircuit winding 23 preferably by the multiphase current excitation, moves built-in field to produce on one second, and these Inside coils are linked to be a single-phase winding and also are fine, and this point will be explained below in more detail.But, in the embodiment that the present invention recommends, the inner winding 23 of multiturn is linked to be a polyphase windings, feeds multiphase current through supply lines 24, produce an electromagnetic suspension field of force that moves up, the electromagnetic suspension field of force homophase that moves up that it produces with the outside winding 22 of multiturn basically.But inner winding 23 also produces a control another arena vertical with the electromagnetic suspension field of force that moves up, and the action direction of the control another arena that its action direction and outside winding 22 produce is opposite.

Fig. 2 illustrates the outside winding 22 of multiturn and is connected on polyphase source and the controller 25, can control power output, these two kinds of controllers that controller all is existing ordinary construction separately by frequency controller 26 independent controlled frequencies with by power controller respectively.Equally, the inner winding 23 of multiturn shown in Figure 1 is connected on inner winding power supply and the controller 28 by supply lines 24, independently power controller 31 of an independent frequency controller 29 and one is arranged, be used to control frequency and the size (power) that via controller 28 is supplied with the electric current of the inner windings 23 of multiturns.As mentioned above, the inner winding 23 of multiturn can be connected into and be similar to the such polyphase windings of the outside winding of multiturn 22, and in this case, the electric current of supplying with through supply lines 24 by controller 28 is the multiphase current that can produce the electromagnetic suspension field of force that moves up.The electromagnetic suspension field of force homophase that moves up that this field of force is preferably produced with the outside winding 22 of multiturn basically, but the opposite control another arena, control another arena of a, action direction vertical with the suspension field of force that moves up and winding 22 generations of multiturn outside is arranged.

During operation, the metal melted by the stove (not shown) flows into storage tank 10 through inlet 10A, be shifted out from storage tank 10 then, upwards enter the bottom of the annular cast container that upright the outer surface by cover 13 in the inner surface of ceramic coat 12 and the relative pottery constitutes.Equipment should be arranged like this: under the effect of gravity or topped inert gas, rising enters liquid level in the annular cast container between the ceramic wall of cover 12 and 13 just above the lower end of outside winding 22 of multiturn and the inner winding 23 of multiturn at the liquid metal shown in 32.In the continued operation process, in order to keep the initial liquid level by liquid metal in the 12 and 13 annular cast containers that constitute, the liquid metal in the holding furnace should be interrupted or add continuously in the storage tank 10 as required.Liquid metal move on can being subjected on this height that outside winding 22 produces that the electromagnetic suspension field of force and inner winding 23 produce on move electromagnetic force field effect.No matter what the inner winding 23 of multiturn was produced only is a horizontal control force another arena, still one comprises on its action direction control branch field of force opposite with the suspension electromagnetic force field of multistage outside winding 22 generations compound and moves the electromagnetic suspension field of force, and liquid metal all will be subjected to above-mentioned effect.

When starting beginning, from inserting, the lower end of starting pipe and the upper end of the tubulose liquid metal post that the liquid metal by rising in the annular cast container forms are contacted by the upper end of the 12 and 13 annular cast containers that constitute.When cooling water passed through separate heat exchanger 15 and 18 fast, the tubulose liquid metal post 32 that contacts with the starting pipe can be solidified.Starting pipe and be attached at the tubular metal post 33 that has solidified on the starting pipe then will be by means of withdrawing roll shown in Figure 2, from by upwards pulling out the 12 and 13 annular cast containers that constitute.Starting pipe and the tubular metal post 33 that is attached on the starting pipe are pulled out with the speed that metal column forms, and this speed has determined the productivity ratio of this continuous casting system.Tubulose liquid metal post by multicircuit winding 22 and 23 length limited solidifies when solidifying in the zone, owing to the effect in the electromagnetic suspension field of force that is subjected to moving is in essentially no gravity and stress-free state, the detailed explanation of relevant this respect can be seen the United States Patent (USP) № 4 that quoted the front, 414,285.

In operating process, solidify tubulose liquid metal post in the zone during suspending according to the mode of narrating above, have a kind of beyond thought self regulating charactoristic of uniqueness.Because this self regulating charactoristic is arranged, if make the rate of climb quickening of tubulose liquid metal post greater than the gravity of liquid metal post owing to suspending power, then the area of section of metal column will reduce, and reduce to cause climbing power to reduce automatically by the area of section that bigger suspending power causes, then tubulose liquid metal post on the speed of moving will slow down automatically, so this is a self-stabilization and self-adjusting system.Conversely too, if slow down owing to suspending power reduces to make the tubulose liquid metal post rate of climb, then the cross-sectional area of tubulose liquid metal post will increase, and the increase of cross-sectional area increases the suspending power that acts on the metal column, thereby the rate of climb of tubulose liquid metal post is accelerated.Therefore as can be seen, in the suspension zone (just liquid or solid-state tubular metal post is subjected to moving the zone of electromagnetic suspension force field), this system was exactly a self-adjusting system originally.As mentioned above, when this system moves, the tubulose liquid metal post that is solidifying is played the suspension supporting role, make it be in essentially no gravity and stress-free state.

Though work on most of length of whole effects in the electromagnetic suspension field of force liquid and solid-state tubular metal post in solidifying the zone, be in lower end and upper end (the suspension field of force at this two place on average has only about half of solidification zone mid portion) of solidifying the metal tube in the zone and supported by the pressure differential and the foregoing climbing power of transmitting by the starting pipe that make liquid metal rise to elemental height respectively.So, when tubulose liquid metal post is forming, the suspension field of force of lower end provides a little acceleration that makes progress, and when tubulose liquid metal post is moved upwards up to the mid portion in the zone that suspends, it promptly enters one by force to being enough to that metal column is in the suspension field of force of basic null-gravity state, is in essentially no pressure contact condition between the sidewall 12 and 13 of it and annular cast container.Owing to there is not pressure, the surfaces externally and internally of liquid metal post and looping casting container 12 and 13 against just there not being continuous pressure to contact between the surface of metal column basically, tubulose liquid metal post in critical solidification zone does not have hydrostatic pressure difference basically yet, in this critical zone, the gravity, frictional force and the adhesion strength that act on the metal column in solidifying are reduced to minimum.

The interior diameter of design cylindrical ceramic overcoat 12 and cup-shaped in during the overall diameter of cylindrical dip portion of ceramic jacket 13, should make the surface of tubulose liquid metal post 32 and the gap minimum between ceramic jacket 12,13 apparent surfaces.In fact this annular gap is not a gap, but between the sidewall of the surface of tubular metal post and casting container brokenly or the gap that occurs at random.Gap size is remained a very little value, is crucial for good heat exchange.Because this gap is too little, so on figure, be difficult to show.Yet, among Fig. 2 and Fig. 3 of the United States Patent (USP) № 4,414,285 that quoted as proof in front, attempted on figure, expressing the position in gap.But should remember that this surface is a kind of graphic expression of illustrating, rather than to the position in gap and the actual expression of size.This gap is at random and irregularly to occur, the existence in gap can be from final set the glossiness ripple outward appearance of tubular metal product obtain proof.If since on move the electromagnetic suspension field of force the control branch field of force make the gap become too big, then may significantly reduce the effective heat exchange between tubulose liquid metal post and ceramic jacket 12 and 13 opposite flanks, because the inverse relation of Cheng Qiang between the known field intensity and the coefficient of overall heat transmission.Therefore, the intensity in the suspension field of force should be adjusted at the very start casting process, keeps the gap of minimum to realize good heat exchange guaranteeing desirable no pressure contact, to resemble to stipulate above.Then field intensity is fixed as this setting, even and in casting process tubulose casting container post may change by the translational speed (linear velocity) of solidifying the zone, should not allow field intensity change yet.

Referring to Fig. 2, can see that the tubular metal product of having solidified is pulled out from the pipe assembly upper end that suspends and after sending fore-cooling room 34 to, delivered to the hot-rolling mill 37 and 38 of two tandem configuration by withdrawing roll 35 and 36, cool off at last then, be sent to again and batch platform 39 and batch.Another kind of situation is, if the surface smoothness that the tubular metal product of having solidified 33 has suitable diameter and uses under as cast condition, then metal tube 34 is pulled out by withdrawing roll 35 and 36 from the fore-cooling room, then sends to cooling and no longer further processing.

In operating process, casting speed (just tubulose liquid metal post is by the linear velocity of heat exchanger/levitation device 11) should be adjusted by control withdrawing roll 35 and 36 CD-ROM drive motor, withdrawing roll 35 and 36 and milling train 37 and 38 and coiling machine 39 synchronous.The intensity and the magnet excitation frequency of suspension field should determine that the magnitude range of suspension ratio is between 75% to 200% by the size and the resistance that calculate various casted tubular section metal products.In using practical methods of the present invention and system,, should start under the speed that be lower than normal line speed with under the suspending power that is higher than normal suspending power in order to guarantee reliable starting.After reaching stable mode of operation (in 2 to 3 minutes), linear velocity should progressively be increased by artificial adjustment, and the suspension field intensity should progressively reduce, up near maximum Foundry Production rate.The Foundry Production rate is represented with the tonnage of the solid tubular metal product of per hour being cast by liquid metal.Afterwards, this system just keeps this state in operating process.Under normal circumstances, in order to guarantee to produce smoothly, should monitor the temperature of the tubular metal product of having solidified that floats out, its method is with the naked eye or measures the temperature of the foundry goods when coming out with pyrometer from the annular cast container.

The new method and the equipment of the tubular metal product such as continuous casting of metal pipe in the electromagnetic suspension field of force that the present invention proposes are with practical value.The electromagnetic suspension field of force has reduced the needed power of this series products of casting greatly, thereby has reduced greatly to be generally used for casting the mechanical wear of this series products and tearing.

After the tubular metal product of having narrated method of the present invention, equipment and having produced, can believe that obviously according to top said content, the scheme that also has other improvement of the present invention and conversion offers the professional and technical personnel according to the present invention.In additional claim, comprise the present invention's reform to each concrete scheme in whole specified scopes.

Claims (13)

1, a kind of method of producing long tubular, hollow metal product comprises the following steps:

(a) in annular cast container, form with inside and outside axle surface an extension on move alternate electromagnetic floatage field, form simultaneously one and on move electromagnetic suspension field of force approximate vertical, that direction is inside, the common first Electromagnetic Control field of force of extending;

(b) in the annular cast container, be formed centrally one and on move electromagnetic suspension field of force approximate vertical, direction is outwards and facing to the second Electromagnetic Control field of force of the extending first Electromagnetic Control field of force, common;

(c) liquid metal is introduced the bottom of annular cast container and with it combination on move in the electromagnetic suspension field of force and the control field of force, to form tubular, hollow liquid metal post;

(d) keep the intensity in the electromagnetic suspension field of force and the control field of force to keep the cross dimension of tubular, hollow liquid metal post, make it because of existing slightly the gap to realize not having the pressure contact, can prevent simultaneously the internal real gap of formation between the perimeter surface mutually again at the surfaces externally and internally of tubular, hollow liquid metal post and annular cast container, thereby between tubular, hollow liquid metal post and casting container, realize no pressure contact and form the available heat exchange that is enough to make metal freezing, make gravity, frictional force and adhesion strength reduce to minimum simultaneously;

(e) the tubular, hollow metal column is moved up by casting container and the electromagnetic suspension field of force and the control field of force; And

(f) top of cakey tubular, hollow metal product from casting container is shifted out.

2, method according to claim 1 is characterized in that, move on described the electromagnetic suspension field of force comprise one outside extend on move the electromagnetic suspension field of force and one inner extend on move the electromagnetic suspension field of force.

3, method according to claim 1, it is characterized in that, moving the inside Electromagnetic Control field of force of the electromagnetic suspension field of force and direction on described is to be produced by the outside polyphase winding winding around annular cast container outside, these coil windings are powered by separately controllable polyphase source, and the size of its output current and the variation of frequency are controllable.

4, method according to claim 2, it is characterized in that, moving the electromagnetic suspension field of force and the inside Electromagnetic Control field of force of direction in the described outside extension is to be produced by the outside polyphase winding winding around annular cast container outside, these coil windings are powered by separately controllable polyphase source, and the size of its output current and the variation of frequency are controllable; And described inner extend on move the electromagnetic suspension field of force and the outside Electromagnetic Control field of force of direction is to be produced by the inside polyphase winding winding that is placed in the axle, these coil windings are powered by separately controllable polyphase source, and the size of its output current and the variation of frequency are controllable.

5, method according to claim 1, it is characterized in that, move the intensity in the electromagnetic suspension field of force on described and set up, the tubular, hollow liquid metal post of per unit length is provided suspend than the suspending power that is 75% to 200% by the type and the size of institute's casted tubular section hollow metal product.

6, the product of making according to the described method of claim 1 is characterized in that this product is that a chemical analysis and diameter are even basically, has the fine and close even metal pipe of flash of light corrugated surface.

7, a kind ofly make liquid metal solidification and produce the continuous casting equipment of tubular, hollow metal product, comprising:

(a) the annular tube shaped casting container of a vertically installed length (11,12,13) is used to hold the liquid metal of putting within it to be solidified;

(b) liquid metal is delivered to the bottom of annular cast container (11) to form the device of tubular, hollow liquid metal post (32);

(c) heat-exchange device (15,18) that is used to cool off and solidify tubular, hollow liquid metal post (32) wherein that matches with casting container (11);

(d) device that cakey tubular, hollow metal product (33) is shifted out from the top of casting container (11);

(e) on the outside segment length of annular cast container (11) in order to produce the device (22) in the inside control field of force of the external electromagnetic suspension field of force and direction;

(f) be arranged in the center of annular cast container (11) to produce the device (23) in the outside control field of force of the internal electromagnetic suspension field of force and direction, be used for produce again outside the inside control field of force of the first electromagnetic suspension field of force of the outside that produces by the external electromagnetic suspension field of force and control field of force generation device (22) and direction an inside second on move the electromagnetic suspension field of force and the outside control field of force of direction, the described outside and the internal electromagnetic suspension field of force and first and second control field of force generation device (22,23) reduced the hydrostatic pressure difference of tubular, hollow liquid metal post, and keep not having the pressure contact condition by between the perimeter surface (12,13) of the surfaces externally and internally of tubular, hollow liquid metal post (32) and annular cast container, forming slightly the gap;

(g) power supply and control device (22,25,26,27,23,28,29,31) be a certain numerical value with the size of controlling the field of force, in order to keep the outside and inner electromagnetic suspension field of force, the cross dimension that makes tubular, hollow liquid metal post (32) is even as big as preventing at the surfaces externally and internally of tubular, hollow liquid metal post (32) and the interior lateral wall (13 of annular cast container, 12) form real gap between the interior perimeter surface, thereby make tubular, hollow liquid metal post (32) and annular cast container (11,12,13) there are enough assurances to reach the heat exchange of solidifying between, can make gravity simultaneously, it is minimum that frictional force and adhesion strength reduce to;

(h) device that tubular, hollow liquid metal post is moved on by casting container with described outside and the internal electromagnetic suspension field of force and irrelevant being used to of control field of force generation device; And

(i) device (35,36) that cakey tubular, hollow metal product is shifted out from casting container (11) top.

8, equipment according to claim 7, it is characterized in that, described outside all comprises each a plurality of solenoid gone up mutually that is connected to a polyphase source in succession separately with the internal electromagnetic suspension field of force and control field of force generation device, transfers the power transformation field of magnetic forece on first and second to produce.

9, equipment according to claim 8, it is characterized in that, this equipment also comprises a storage tank (10) in order to deposit liquid metal that links to each other with annular cast container (11) lower end, and comprises that also one is matched with this storage tank (10) to form tubular, hollow liquid metal post and it is moved on to the device of the horizontal position more than the lower end of outside in the annular cast container and the internal electromagnetic suspension field of force and control field of force generation device.

10, according to Claim 8 or 9 described equipment, it is characterized in that, the power output of described polyphase source (25,28) and frequency can be according to the type of need casted tubular section hollow metal product and sizes and are adjusted, with produce one symmetrically on move electromagnetic suspension force.

11, equipment according to claim 10, it is characterized in that, this equipment comprises that also the tubular, hollow metal product that solidifies to coming out from casting container top carries out pre-cooled device (34), product is rolled down to the device of desired size and rolling intact product is cooled to the device (37,38) of environment temperature.

12, equipment according to claim 10, it is characterized in that this equipment also comprises the tubular, hollow metal product that solidifies that comes out from casting container top is carried out pre-cooled device (34) and the tubular metal product after pre-cooled further is cooled to the device of environment temperature.

13, equipment according to claim 7, it is characterized in that, the described second Electromagnetic Control field of force generation device comprises single-phase electromagnetic control field of force generation device, in order to produce direction outside act on the Electromagnetic Control field of force on the tubular, hollow liquid metal post.