CN101128277A - Method of and molten metal feeder for continuous casting - Google Patents
Method of and molten metal feeder for continuous casting Download PDFInfo
- Publication number
- CN101128277A CN101128277A CNA200680006003XA CN200680006003A CN101128277A CN 101128277 A CN101128277 A CN 101128277A CN A200680006003X A CNA200680006003X A CN A200680006003XA CN 200680006003 A CN200680006003 A CN 200680006003A CN 101128277 A CN101128277 A CN 101128277A
- Authority
- CN
- China
- Prior art keywords
- casting
- tip
- metal
- feeder
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0605—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two belts, e.g. Hazelett-process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
- B22D11/0642—Nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a feeder for delivery of molten metal into a mold formed between confronting casting surfaces of a continuous casting machine. The feeder comprises a projecting nozzle tip having at least a lower wall provided with a molten metal-contacting inner surface, a generally flat outer surface and an end surface at an outer extremity of the tip extending between the inner and outer surface. The inner surface is generally flat and preferably slopes towards the outer surface considered in a direction moving towards the extremity of the tip at an angle of slope of no more than 8 degrees. The end surface is generally flat and extends from the inner surface to the outer surface at an acute angle of less than 88 DEG , e.g. in the range of 15 to 80 degrees, relative to the inner surface in a direction away from the extremity of the tip. The feeder casts a metal sheet article having reduced surface defects caused by rupture of the metal oxide during casting.
Description
Technical field
The present invention relates to the continuous casting of motlten metal, preferred aluminium and aluminium alloy.More particularly, the present invention relates to motlten metal is introduced method in the casting cavity of conticaster and the metal feeder that is used for this purpose.
Background technology
The continuous casting of metal has been implemented for many years, for example by using twin belt caster, twin-roll casting machine or spill spin block casting machine.The conticaster of this type have usually be formed on two in the face of and continuously between the rotational casting surface, level or downward-sloping slightly casting cavity.Motlten metal is introduced into an end of cavity, and when the casting surface by rotation drew it by the casting cavity, it cooled off and solidifies.Ingot casting, slab or coagulation band reveal from the casting cavity in end opposite.
By the molten metal feeder of some forms, motlten metal is introduced in the casting cavity, and wherein this feeder is introduced motlten metal stream between casting surface.This feeder can be with open-top flute profile formula, wherein motlten metal utilizes the open slot guiding or imports in the casting cavity (being called " pond charging "), perhaps more preferably utilize the outlet of surrounding and limiting motlten metal, from the tip of the least significant end of outlet, reveal up to it.
The ingot of the as cast condition of being made by DC (direct chill casting) and continuous strip caster can produce metal slabs or band, and these metal slabs or band have polytype blemish.In DC-casting, such blemish often utilizes " peeling " (promptly removing thin top layer from cast article) to remove.Yet in continuous band casting, peeling is not reality or economical, and it need provide the product with minimum blemish at first.
Blemish can be produced by multiple mechanism, comprises reaction and local cooling heterogeneity with the refractory material of metal feed system, and has carried out size and the number that many improvement reduce such defective.
Another common mechanism comprises being mingled with of oxide on surface of formation " cold shut ".This defective results from the lip-deep inevitable oxide on surface of meniscus that is formed on motlten metal, and wherein motlten metal flows out the metal feeder to contact mobile die cast surface.When the meniscus surface when dragging by the moving casting surface, become tension and breaking of oxide-film causes the big relatively of atypical characteristic and tangible blemish.This not only influences the outward appearance of cast article, and can cause the weak link of the structure that causes integrity problem.In the special applications on surface, this defective is critical especially, the paillon foil raw material that for example can store, and Automobile Plate, and can limit the speed of casting.
The disclosed feeder design of the multiple reference of preexist and introduce the method for metal in the continuous casting cavity, for example on June 10th, 1997 laid-open U.S. Patents laid-open U.S. Patents on April 27th, 5,636,681 and 2,004 6,725,904.The feeder design intention of these patent disclosures produces the non-turbulent metal flow that enters in the casting cavity.
The European patent No.EP0962271B1 (inventor Valerie G Kagan) that licensed to Hazelett Strip-Casting company on December 17th, 2003 discloses a kind of belt casting device with metal conveying device, and this metal conveying device " is poured into " metal to being with.The tip of conveying device separates a distance at a distance of the surface of band, and it terminates in an end, and the Metal Contact inner surface of this end face setting and conveying device meets at right angles.
Apply for by Hazelett Strip Casting company (inventor is Robert W.Hazelett etc.), the United States Patent (USP) 4 that on March 10th, 1987 authorized, 648,438 disclose a kind of tape casting machine and metal conveying device, and wherein Jian Duan end is " square " and setting and casting surface meet at right angles.
Below be the example with most advanced and sophisticated strip caster, inside that wherein should the tip is the taper towards the tip:
By Prolizenz AG application (inventor Ivan Gy ngy s), the United States Patent (USP) 3,774,670 that on November 27th, 1973 authorized; By Hunter Engineering company (inventor Denis M.Smith) application, the United States Patent (USP) 5,660,757 that on August 26th, 1997 authorized; With by Aluminum Company of America (inventor Nai-Yi Li etc.) application, the United States Patent (USP) 6,173,755 that calendar year 2001 authorizes.
Summary of the invention
The objective of the invention is to improve the continuous casting of motlten metal, particularly molten aluminum and its alloy, special in order that reduce the blemish of cast article and the incidence that more special minimizing is incorporated into the oxidation in the cast(ing) surface.
According to an aspect of the present invention, provide a kind of being used for that delivery of molten metal is gone into the interior feeder of casting mold (mold is called crystallizer again), wherein this casting mold is formed between the continuous casting machine casting surface of facing mutually of (claiming conticaster again).This feeder comprises and protrudes most advanced and sophisticated outlet (nozzle), and this tip comprises at least one wall, and these walls are furnished with motlten metal contact inner surface, the end face at the external end place at the outer surface and the tip of extending between inner surface and outer surface.Inner surface and end face interconnect and form the angle less than 88 ° at the straight line place, and the wall of outlet has 0.5 to 3 millimeter thickness being adjacent to this straight line place.
According to another embodiment, a kind of continuous casting machine is provided, it comprises a pair of casting surface that passes the annular that faces with each other of casting cavity, with identical speed, at the device of mobile casting surface on the identical direction be used for motlten metal being introduced feeder in the casting cavity at an end place of cavity.This feeder comprises and protrudes most advanced and sophisticated outlet, and this tip comprises at least one wall, and these walls are furnished with motlten metal contact inner surface, the end face at the external end place at the outer surface and the tip of extending between inner surface and outer surface.Inner surface and end face interconnect and form the angle less than 88 degree at the straight line place.This wall has 0.5 to 3 millimeter thickness in the scope being adjacent to this straight line place, and this straight line is positioned at adjacent casting surface and is spaced apart in 0.5 to 3 millimeter the scope during casting.
According to still another embodiment of the invention, provide a kind of motlten metal is carried out continuous band casting to form the processing method of cast metal carries product.This method comprises that the feeding molten metal that will come out from the outlet with protrusion outlet tip moves on the casting surface at least one, can produce oxide layer when wherein this motlten metal contacts with air, thereby make metal form meniscus, this meniscus has at the end at tip and the face coat of the metal oxide between the casting surface.This metal is supplied with from the tip, and this tip has the wall that is equipped with inner surface and end face, and this inner surface and end face interconnect and form the angle less than 88 degree at the straight line place.This wall has 0.5 to 3 millimeter thickness being adjacent to this straight line place, and this straight line is positioned at and being spaced apart in 0.5 to 3 millimeter the scope of adjacent casting surface during casting.
The present invention relates to obtain the carries product of the continuous casting of excellent surface quality.When the inventor obtained improving of surface quality aspect by foundry engieering and device are carried out common improvement, they noticed that existence extends through the periodic surface striped of cast article and the direction of casting meets at right angles.The inventor finds these stripeds, at least in part because, be formed on that the vibration of the meniscus between casting tip and the casting surface causes.When the casting active metal, for example during aluminium, the meniscus surface is coated with metal oxide layer, and the vibration of meniscus can cause this layer to break.Therefore, the underlying metal of exposure with air reaction after promptly generate new oxide layer, but when this oxide layer is formed on casting surface, this breaks can be in surface of casting mold product formation obvious defects.The vibration of meniscus is that conticaster is intrinsic in theory, is being used to cast aluminium and its alloy at least, and in the tape casting machine of other active metal, and they can not fully be eliminated.Therefore the inventor has taked another kind of approach, just increase vibration uniformity have with generation little, the cast article of regular interval striped because the rule of these products and meticulous outward appearance, these products can itself not demonstrate blemish at them.Especially, it is found that the vibration of the meniscus of at least 50 hertz of requirements, for example in 50 to 200 hertz of scopes, produce acceptable outward appearance to give the casting mold product.
Meniscus tends to meet at right angles with its surface and vibrates, and it tends to become round, still less the circle of becoming the zone that extends to casting surface from outlet then, wherein vibration of each such cyclic representation.
The inventor finds the influence of the hard to bear a plurality of parameters of frequency energy of meniscus oscillations, for example application of external force, for example application in the magnetic field of compressed air pressure in the little gap between outlet and casting band and the variation in the zone at meniscus.Yet the inventor finds that the mode of the most effective increase vibration frequency is structure and the layout that is used to spray the outlet of motlten metal to the casting surface by improvement.
About the structure of casting outlet, a pair of protrusion wall is used in traditional outlet, and these walls define the molten metal passage between the interior metal contact surface of facing mutually.This passage has outlet at the tip of outlet, wherein protrudes wall and terminates in the flush end surface, and extend with the interior metal contact surface with meeting at right angles on this flush end surface.This wall also has outer surface, and it extends along having closely spaced casting surface in use.When using the outlet of this type, it should be noted that not only the vibration frequency of meniscus is slowly with unsettled, and should vibration can cause that metal contacted with the end face of exit wall, cause the formation and the increase of oxide whiskers, thereby further cause adhesion and interference with this vibration.The inventor finds can reduce or eliminate these effects by " pruning " this end face more than to a certain degree.This means cause end face from the enterprising line tilt of backward directions of the contacted straight line of interior metal contact-making surface, to form angle (angle in the material of exit wall) less than 88 degree, more preferably 85 the degree or still less, preferred especially 80 the degree or still less, and most preferably 75 the degree or still less.Minimum angles is 15 degree preferably, are unpractical (although can overcome as the fruit structure limitation, it is tangible that required effect remains) because be used to construct the littler angle of outlet current.The more desirable lower limit that is used to prune is 30 degree.More preferably lower limit is 45 degree.Most preferably, the end face of exit wall is smooth along its total length, that is to say from passing outlet with the crosspoint of inner and outer wall with from a side to opposite side.This has the advantage of constructing striped more regularly, particularly passes the width of casting cavity.
Above-mentioned contact wire (top of angle) is formed for so-called " tapping point " of meniscus, and just at this some place, motlten metal breaks away from and contacting of exporting, and with temporarily support by surface tension before casting surface contacts.Be necessary to provide a kind of like this straight line (be the unexpected variation of direction, wherein smooth surface contacts with acute angle usually).Under situation about operation principle of the present invention not being limited, find that this straight line and the acute angle in this position can depart from most advanced and sophisticated point by fixing metal, thereby make it can on the section of exit wall, not move.The vibration of metal presents on the contrary in the localization of removing the line place, and wherein when metal leaves this tip, they are with rule and frequent standard this oxide layer of breaking, thereby cause occurring on final products rule and meticulous striped.
Once more, under the situation to one theory not, the amplitude that seems meniscus oscillations is along with casting speed (i.e. the speed of casting band) increases together.The more large amplitude of vibration has increased " pace up and down " risk on the end face of outlet of meniscus, increase along with casting speed like this, " pruning " angle can reduce (be the angle of end face and inner surface should wish to make littler, for example in 15 to 80 degree scopes) as required.For casting fast, angle should preferable configuration for being not more than 75 degree and 70 degree, perhaps even 65 to spend be preferred higher limit.
Ideally, should make that at least for aluminium or aluminium alloy, meniscus vibrates to about 200 hertz frequency with 50 hertz.Frequency range depends on the physical property of metal, density for example, and viscosity and surface tension, but only for the great change on these performances.Variation among aluminium alloy is quite small, but the change of base metal (for example aluminium is to copper) may produce the great change of influence vibration more significantly.
In the present invention, it is found that the interval between " tapping point " and casting surface should be quite specific.If it becomes excessive, it is to be difficult to or can not to keep stable meniscus, because its meeting " is paced up and down " on the end wall at tip and metal can move rearwards to below the tip of outlet.The change of this flow behavior become similar pour into fluid rather than rapidly casting.Yet, at interval should be enough greatly to allow meniscus to be formed between tapping point and the casting surface.Separate the needs of casting surface a little by building method with to the tip, beeline is controlled by the restriction that is arranged on the tip.Preferred interval (to the branch wiring of casting surface) is greatly about 1 millimeter ± 0.5 millimeter.Yet, have normal exit wall thickness (about 1 millimeter or 1/32 inch usually) and reach about 3 millimeters interval.
This metal can inject enclosed outlet or open-top outlet from normal flow hopper or tundish.The present invention can use the outlet of both types, but preferred enclosed outlet.
When outlet is enclosed, two walls that form outlet can be smooth and be parallel in their length, perhaps in the end they can be " enlargings " or " bifurcated ", and the wall that just is adjacent to the metal output outwards carries out bending with the angle that is not more than about 8 degree usually.This allows wall to restrain towards casting surface by the low-angle at the least significant end place at tip.
But the present invention's usage level with vertical casting machine, paired tape casting machine for example, spill spin block conticaster, even twin-roll casters (when the present invention used, twin-roll casters preferably operated at a high speed down).
The accompanying drawing summary
Fig. 1 is the part cross-sectional side view of twin belt caster (the no metal feed arrangement) type used of the present invention;
Fig. 2 is the metal feeder of the twin belt caster type used of the present invention and the cross sectional view of adjacent part;
Fig. 3 shows the generation of metal meniscus, the viewgraph of cross-section of the part that prior art outlet and adjacent casting band and motlten metal flow;
Fig. 4 is the view that is similar to Fig. 3, but shows the part according to outlet of the present invention.
Fig. 5 is the top plan view that is used at the testing equipment of following example;
Fig. 6 is the cutaway view of the testing equipment of Fig. 5;
Fig. 7 A, 7B, 7C and 7D illustrate the viewgraph of cross-section that is used in the tip in the following example 1;
Fig. 8 shows employing has the angle of 93 degree between inner surface and end face prior art outlet, the enlarged photograph on the surface of aluminum alloy strip foundry goods;
Fig. 9 show employing between inner surface and end face, have 88 the degree angles according to outlet of the present invention, the enlarged photograph on the surface of aluminum alloy strip foundry goods;
Figure 10 show employing between inner surface and end face, have 78 the degree angles according to outlet of the present invention, the enlarged photograph on the surface of aluminum alloy strip foundry goods;
Figure 11 show employing between inner surface and end face, have 48 the degree angles according to outlet of the present invention, the enlarged photograph on the surface of aluminum alloy strip foundry goods; With
Figure 12 show employing between inner surface and end face, have 33 the degree angles according to outlet of the present invention, the enlarged photograph on the surface of aluminum alloy strip foundry goods.
Implement best mode of the present invention
As mentioned above, metal is cast continuously to form carries product (often being called thin plate, plate, slab, ingot, steel billet, layer etc.) implemented many years and may be implemented in the dissimilar continuous casting machines.For example, Alcan research and development Co., Ltd (inventor Olivo GiuseppeSivilotti) application, the twin belt caster that on December 6th, 1977 authorized is at United States Patent (USP) 4,061, in 177 open in detail, and the casting machine of this type (and other) is suitable for implementing the present invention.The disclosure of this patent is carried out combination as a reference at this, and below briefly will being provided at the description of simplifying.
The twin belt caster 10 that illustrates has the rotating metallic band 12 and 14 of annular up and down, they are arranged so that the all-moving surface of tight spacing of band is to casting surface 16,18 are set parallel to each other basically, by a zone, wherein they limit the casting cavity (casting mold) 20 from cavity inlet 21 to cavity outlet 22.When band rotation during, these bands are led by the suitable oval or other loop return path between the entrance and exit of casting cavity.Top band 12 transmits around cylindrical live-roller 24, advances along upper passage then, and wherein it is further, if necessary, is supported by (not shown) such as idler roller rows, then around half roller bearing 25.The bottom band is followed the substantially the same still path of mirror image imaging, comprises drive roll 26 and is similar to and then half roller bearing 27 of top setting.Motlten metal (does not illustrate at Fig. 1 by feeder 30, but shown in Figure 2) introduce in the casting cavity, this feeder 30 protrudes most advanced and sophisticated 34 nozzle (nozzle) 32 in conjunction with having, and this protrusion most advanced and sophisticated 34 is equipped with motlten metal at these most advanced and sophisticated external end (least significant end) 36 places and exports 35.Therefore, with the direction access to plant shown in the arrow A (Fig. 1), this metal freezing is within casting cavity 20, and the foundry goods carries product is in the exit of casting cavity, to reveal from this device on the direction shown in the arrow B from feeder 30 for motlten metal.Reverse (inside) surface 17,19 of foundry goods band utilizes the jet of cooling water to cool off usually, for example shown in 23.
Fig. 2 illustrates the zoomed-in view of the end of the casting machine that is adjacent to the inlet 21 of casting cavity 20.Be with 12 and 14 to illustrate with chain-dotted line.As mentioned above, this device is equipped with molten metal feeder 30, and it can be disclosed type, and for example Alcan international corporation applies for, the United States Patent (USP) 5,636,68 of authorizing on June 10th, 1997 (the disclosure is carried out combination as a reference at this).Feeder 30 comprises top and bottom fixture 38, and it keeps metal to carry outlet 32 in position, thereby makes its tip 34 stretch out between two moving belts 12 and 14 of tape casting machine.Fixture 38 is that bolt is connected on the structure (not shown) of casting machine and supports outlet 32, thus make upstream open 40 can be used for feeding molten metal is matched to the tundish of casting machine or the similar opening of charging box (not shown).The sealing of resilient refractory (not shown equally) is used between the upstream face 41 and tundish or charging box of outlet.Outlet 32 is made by the material of refractory, and for example in U.S. Patent No. 5,636, described in 681, and most advanced and sophisticated 34 have the shape of as directed bifurcated slightly.Pad 46 with woven wire or metal tape form, is provided between the outer surface and adjacent foundry goods band of outlet, to be maintained fixed and controlled interval between outlet and band.Outlet comprises the wall 53 of refractory, and it has the inner molten-metal contact-making surface 55 that faces with each other, and they pass motlten metal and transmit passage 50, outlet 35 from the upstream open to the metal.This wall has at straight line 65 places and inner surface 55 interconnective end faces 56.This wall also has outer surface 54, and it is in the face of foundry goods band 12 and 14.
The present invention is chiefly directed in the zone of outlet most advanced and sophisticated 34 delivery of molten metal and goes into to cast in the cavity.These will be referring to Fig. 3 and 4 more detailed descriptions.
Fig. 3 illustrates traditional outlet tip 34, wherein only shows the diapire 53 adjacent to the tip of bottom foundry goods band 14.Roof that this is most advanced and sophisticated and top foundry goods band can be envisioned as the mirror image imaging of bottom.The tip that illustrates has outer surface 54, and it is parallel to the surface of adjacent foundry goods band 14 usually, and motlten metal contact inner surface 55 extends, and narrow end face 56 is provided with and the inner surface 55 (as illustrating by little rectangle) at tip meets at right angles.In the conveying and casting process of motlten metal, meniscus 58 (being unsupported metal surface) bridge joint outlet most advanced and sophisticated 34 and adjacent casting are with the gap between 14.For active metal (promptly when contacting, being formed naturally the metal of oxide layer) with air, the alloy of aluminium and it for example, this meniscus is covered by oxide layer 60.When being with 14 to move through casting during cavity, oxide layer 60 is along drawing by this band and by friction, and is subjected near the stress meniscus surface area.It is found that the metal that the oxide layer on meniscus will periodically break and expose will form new oxide layer immediately.Generation oxide breakage and regrowth cause the blemish in cast article.Inventor of the present invention has been found that inevitably the oxide breaks effect can access minimizing or minimize on surface quality by guaranteeing that in mode controlled rather than at random oxide film frequently breaks.
Especially, the inventor has been found that by making meniscus controllable frequency place's free vibration of at least 50 hertz, and the influence that oxide layer is broken is controlled and reduce.Have been found that the outlet cutting-edge structure of the design and use according to the present invention, for example as shown in Figure 4, the vibration and the oxide breaks of rule take place with allowing like this.In this tip, angle [alpha] between inner surface 55 and end face 56 (be called " cut-back angles " and be called " angle " in addition) is the acute angle less than 88 °, preferably between 15 and 85 degree, more preferably between 15 and 80 degree, more preferably between 30 and 80 degree, even more preferably between 30 to 75 degree.When using so a kind of angle, meniscus 58 freely vibrates, and there is not any external action, has physical property, the contact friction between motlten metal and the mobile basic unit (casting band) and most advanced and sophisticated " intrinsic " frequency that can determine to the interval (interval shown in Figure 4 " S ") of band distance by motlten metal.The use of the sharp angle of pruning, in conjunction with most advanced and sophisticated accurate qualification interval S to band, the geometry that means meniscus is controlled at casting reliably with between 12 the casting surface 61 and intersection line 65 (being called " tapping point " or " dividing wiring "), this intersection line 65 between the most advanced and sophisticated end face 56 of inner surface 55 and outlet, thereby make that vibration frequency is stable.The use of the sharp angle of pruning has guaranteed that the contact terminal point between motlten metal and outlet is limited in the place, fixed position on the tip, and just the intersection line 65.In this, molten metal surface is transformed into unsupported state (with the form of meniscus) from holding state (being supported by outlet), and when vibration took place meniscus, the oxide-film on the metal surface broke repeatedly along this straight line.Oxide breaks has the regular frequency identical with vibration frequency, and takes place on a small quantity and regular breaks, thereby creates rule and defective minimum on the metal surface.
If the angle [alpha] of pruning is not acute angle (for example, as 90 degree in traditional outlet tip), the end face 56 that this meniscus 58 can contact tip during vibrating.Promptly form oxide whiskers like this on the end face at tip, then make be lower than intersection line 65 places, meniscus adheres on the end face 56.This adhesive force is variable and prevents the rule of meniscus and the generation of free vibration.Therefore, breaking in oxide layer is irregular and delay, and the blemish that produces is bigger.
It is relevant with casting speed to a certain extent that the amplitude of meniscus oscillations seems, just bigger amplitude takes place casting speed faster.Because bigger amplitude can cause meniscus more to be difficult to be fixed in the outlet, need reduce angle [alpha] under the casting speed situation faster, and for fast casting speed, the angle that is not more than 75 degree is normally desirable.On the other hand, if cut-back angles is spent less than 15, it becomes and is difficult to construct the outlet tip with necessary rigidity and strength character.S (it is the some place that contacts this surface at meniscus, the distance between the casting surface 61 of " tapping point " 65 and casting band) influences the performance of casting cycle at interval.For most alloy and casting operation, S should be in 0.5 to 3.0 millimeter scope at interval.S is included in the thickness of the diapire 53 at most advanced and sophisticated place at interval, so this thickness also must be in 0.5 to 3.0 millimeter scope.For interval S, most preferred distance is 1 ± 0.5 millimeter.This is by with alumina-silicate fiber plate (for example fiberfrax R)) structure sidewall 53 realizes that it has 1 millimeter thickness, the place is compressed with curing agent a little at the tip.When material compresses and a little during use because thermal expansion when changing a little on thickness, S can keep and form about 1 millimeter of slight clearance between sidewall 53 and the casting surface at interval.To the greatest extent let it be narrow thickness, this illustrates material and has enough intensity and hardness, and it also has low relatively thermal conductivity as required.
With reference to following Example further the present invention to be shown particularly but not the intention limit the scope of the invention.
Example 1
The effect that has the different feeds device tip angle on the single casting mold plane (water-cooled) of open top box of sliding bottom in utilization is studied, with the metal flow state of simulation on from fixing feeder tip to the current salband.This installs at Fig. 5 (plane) with shown in Fig. 6 (vertical longitudinal cross-section).
Metal is poured in the case 70, and base plate 71 flatly draws with predetermined speed and molten metal temperature, flow on the sheet metal casting mold 73 from the end 72 of movable base plate to allow metal 75, and herein, it solidifies gradually towards movable base plate.Movable base plate (forming thin slide plate) is made with the most advanced and sophisticated identical materials of the feeder that is used to cast continuously, and right hand end changes to the geometry shown in the 7D as Fig. 7 A, with the effect of research this change on the frozen metal, the ingot surface defective of meniscus dotted line and other for example.The speed of extracting base plate out changes, to simulate most advanced and sophisticated different metal flow speed and state on profile.The geometry of Fig. 7 A has the cut-back angles of 75 degree corresponding to the present invention.Fig. 7 B has the cut-back angles of 120 degree, just outside scope of the present invention.Fig. 7 C has composite surface, and still the angle of locating in inner corner (" tapping point ") is 120 degree.Second angle does not influence meniscus, because it does not form tapping point.Fig. 7 D has curved exterior surface, and therefore has unclear inner corner or " tapping point ".Fig. 7 B, all states cause solidifying the undesirable oxide breaks of joint among 7C and the 7D, except at the state shown in Fig. 7 A, the undercutting tip angle of 75 degree, it brings forth good fruit.For the same structure at Fig. 7 A, the undercutting angle is converted to 60 and 30 degree, and all good results can obtain by the sharp keen upper limb at Fig. 7 A.
Example 2
Use has the metal of a plurality of cut-back angles and carries outlet, can implement a series of casting in the experimental scale tape casting machine.On copper strips,, use 10 millimeters thickness foundry goods of aluminium alloy AA5754 casting to cast with 8 to 10 meters/minute speed.The surface of casting band is observed and takes a picture.Its result is shown in Fig. 8 to 12 and in the table 1 below being summarised in.
| Table 1 | ||
| Cut-back angles | Figure number | Observed result |
| 93 degree | 8 | About 30 millimeters at interval brokenly serious oxidized zone or folding line |
| 88 degree | 9 | About 30 millimeters at interval brokenly oxidized zone or folding line |
| 78 |
10 | The regular meticulous band at about 1 millimeter interval |
| 48 degree | 11 | The regular meticulous band at about 1 millimeter interval |
| 33 |
12 | The regular meticulous band at about 1 millimeter interval |
The cut-back angles of 93 and 88 degree and use the thin plate foundry goods with the tip of such angle to demonstrate unacceptable oxidation folding line or band outside angular range of the present invention.Such band is common, and 30 millimeters interval is corresponding to about 4 to 6 hertz frequency.Cut-back angles less than 88 degree show the situation that does not have heavy like this band, but have showed meticulouslyr, and more regular surfaces indicates about 1 millimeter interval, are equivalent to surpass 100 hertz frequency.
Claims (20)
1. feeder that is used for delivery of molten metal is gone into casting mold, this casting mold is formed between the casting surface of facing mutually of continuous casting machine, and this feeder comprises:
Have and protrude most advanced and sophisticated outlet, this tip comprises at least one wall, these walls are furnished with motlten metal contact inner surface, the end face at the external end place at the outer surface and the tip of between inner surface and outer surface, extending, it is characterized in that inner surface and end face interconnect and form the angle less than 88 ° at the straight line place, and described at least one wall has 0.5 to 3 millimeter thickness being adjacent to described straight line place.
2. feeder as claimed in claim 1 is characterized in that described angle is in 15 to 85 degree scopes.
3. feeder as claimed in claim 1 is characterized in that described angle is in 15 to 80 degree scopes.
4. feeder as claimed in claim 3 is characterized in that described angle is in 15 to 75 degree scopes.
5. feeder as claimed in claim 3 is characterized in that described angle is to be selected from the scope of 30 to 70 degree.
6. feeder as claimed in claim 1 is characterized in that described thickness is 1 ± 0.5 millimeter.
7. feeder as claimed in claim 3 is characterized in that this tip has two described walls that are in alignment with each other, and wherein said Metal Contact inner surface strides across the metal transfer passage and faces mutually each other.
8. feeder as claimed in claim 7 is characterized in that the described wall at described tip departs from each other on the direction of extending towards described external end.
9. feeder as claimed in claim 8 is characterized in that described wall departs from the angle of about 8 degree of the most advanced and sophisticated longitudinal axis.
10. continuous casting machine, it comprises:
The casting surface of a pair of annular, this strides across the casting cavity to casting surface and faces with each other;
Be used at identical direction and the device that moves casting surface with identical speed; With
Be used for introducing the feeder of motlten metal in the described casting cavity at an end of described cavity;
Wherein said feeder comprises having and protrudes most advanced and sophisticated outlet, and this tip comprises at least one wall, and these walls are furnished with the contact inner surface of motlten metal, the end face at the external end place at the outer surface and the tip of between inner surface and outer surface, extending,
It is characterized in that described inner surface and described end face interconnect and form the angle less than 88 degree at the straight line place, described at least one wall has 0.5 to 3 millimeter thickness at contiguous described straight line place, and described straight line remains on adjacent casting surface and is spaced apart in the scope of 0.5 to 3 millimeter of end face during casting.
11. casting machine as claimed in claim 10 is characterized in that described angle is in 15 to 85 degree scopes.
12. casting machine as claimed in claim 10 is characterized in that described angle is in 15 to 80 degree scopes.
13. casting machine as claimed in claim 12 is characterized in that described angle is in 15 to 75 degree scopes.
14. casting machine as claimed in claim 12 is characterized in that described angle is in the scope of 30 to 70 degree.
15. casting machine as claimed in claim 10 is characterized in that described interval is 1 ± 0.5 millimeter.
16. casting machine as claimed in claim 12 is characterized in that this tip has two described walls that are in alignment with each other, wherein said Metal Contact inner surface is faced each other mutually passes through the metal transfer passage.
17. casting machine as claimed in claim 16 is characterized in that the described wall at described tip departs from each other on the direction of extending towards described external end.
18. casting machine as claimed in claim 17 is characterized in that described wall departs from the angle of about 8 degree of the most advanced and sophisticated longitudinal axis.
19. one kind is carried out continuous band to motlten metal and casts to form the processing method of cast metal carries product, this method comprises that the feeding molten metal that will come out from the outlet with protrusion outlet tip moves on the casting surface at least one, wherein this motlten metal can produce oxide layer when contacting with air, thereby make metal form meniscus, this meniscus has at the end at tip and the face coat of the metal oxide between the casting surface, it is characterized in that described metal supplies with from the tip, this tip has inner surface and end face, this inner surface and end face interconnect point-blank and form the angle less than 88 degree, described at least one wall has 0.5 to 3 millimeter thickness at contiguous described straight line place, and during casting described straight line is positioned at and being spaced apart in 0.5 to 3 millimeter the scope of a described casting surface of adjacency.
20. method as claimed in claim 19, it is characterized in that by providing most advanced and sophisticated with interior metal contact-making surface and end face, final contact between motlten metal and tip is limited in the fixed position on the tip, wherein interior metal contact-making surface and end face interconnect point-blank and have the angle of electing in from 15 to the 80 degree scopes, and cause motlten metal to flow through described interconnective straight line to described casting surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/066,625 | 2005-02-25 | ||
| US11/066,625 US20060191664A1 (en) | 2005-02-25 | 2005-02-25 | Method of and molten metal feeder for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101128277A true CN101128277A (en) | 2008-02-20 |
| CN100528405C CN100528405C (en) | 2009-08-19 |
Family
ID=36927002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200680006003XA Expired - Fee Related CN100528405C (en) | 2005-02-25 | 2006-02-24 | Method of and molten metal feeder for continuous casting |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US20060191664A1 (en) |
| EP (1) | EP1858661A4 (en) |
| JP (1) | JP2008531285A (en) |
| KR (1) | KR20070114296A (en) |
| CN (1) | CN100528405C (en) |
| AU (1) | AU2006217571A1 (en) |
| BR (1) | BRPI0609048A2 (en) |
| CA (1) | CA2596473A1 (en) |
| NO (1) | NO20074877L (en) |
| WO (1) | WO2006089419A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348520A (en) * | 2009-03-12 | 2012-02-08 | 萨尔茨吉特法特尔有限公司 | Casting nozzle for a horizontal continuous casting system |
| CN102596449A (en) * | 2009-10-21 | 2012-07-18 | Sms西马格股份公司 | Method and device for laterally guiding the flow of a metal melt during strip casting |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PT1932605E (en) * | 2006-12-14 | 2010-07-06 | Mkm Mansfelder Kupfer Und Mess | Method and device for manufacturing wide strips made of copper or copper alloys |
| DE102009012984B4 (en) * | 2009-03-12 | 2013-05-02 | Salzgitter Flachstahl Gmbh | Casting nozzle for a horizontal strip casting plant |
| US8579012B2 (en) * | 2009-03-27 | 2013-11-12 | Novelis Inc. | Continuous casting apparatus for casting strip of variable width |
| US20170355014A1 (en) * | 2016-06-13 | 2017-12-14 | Golden Aluminum, Inc. | System and method for replacing and adjusting continuous casting components |
| DE102017221109A1 (en) * | 2016-11-29 | 2018-05-30 | Sms Group Gmbh | casting nozzle |
| ES2933602T3 (en) * | 2018-03-14 | 2023-02-10 | Novelis Inc | Method for manufacturing metal product with improved surface properties |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH508433A (en) * | 1970-06-24 | 1971-06-15 | Prolizenz Ag C O Schweiz Kredi | Nozzle for feeding the molten metal into the caterpillar mold during strip casting |
| US4061177A (en) * | 1975-04-15 | 1977-12-06 | Alcan Research And Development Limited | Apparatus and procedure for the belt casting of metal |
| CH633205A5 (en) * | 1978-01-30 | 1982-11-30 | Alusuisse | DEVICE FOR FEEDING A METAL MELT IN BAND CASTING. |
| US4648438A (en) * | 1982-04-28 | 1987-03-10 | Hazelett Strip-Casting Corporation | Method and apparatus for feeding and continuously casting molten metal with inert gas applied to the moving mold surfaces and to the entering metal |
| JPH01309761A (en) * | 1988-06-08 | 1989-12-14 | Ishikawajima Harima Heavy Ind Co Ltd | Apparatus for pouring molten metal in shifting mold type continuous casting machine |
| CA2517447C (en) * | 1994-07-19 | 2007-05-29 | Alcan International Limited | Process and apparatus for casting metal strip and injector used therefor |
| US5660757A (en) * | 1995-09-01 | 1997-08-26 | Hunter Engineering Co., Inc. | Advanced feed tip nozzle for twin roll caster |
| US6173755B1 (en) * | 1996-05-23 | 2001-01-16 | Aluminum Company Of America | Nozzle for continuous slab casting |
| JPH1058094A (en) * | 1996-08-13 | 1998-03-03 | Fuji Photo Film Co Ltd | Method for continuously casting plate material and apparatus therefor |
| US5804136A (en) * | 1996-11-27 | 1998-09-08 | Hazelett Strip-Casting Corporation | Radial-flow distributor for wide uniform nonturbulent non-dribbling pouring of molten metal into a continuous metal-casting machine-methods and apparatus |
| DE19711116C2 (en) * | 1997-03-05 | 1999-05-12 | Mannesmann Ag | Method and device for casting thin strands |
| US6470959B1 (en) * | 2000-09-18 | 2002-10-29 | Alcan International Limited | Control of heat flux in continuous metal casters |
-
2005
- 2005-02-25 US US11/066,625 patent/US20060191664A1/en not_active Abandoned
-
2006
- 2006-02-24 US US11/884,572 patent/US20080083524A1/en not_active Abandoned
- 2006-02-24 EP EP06705222A patent/EP1858661A4/en not_active Withdrawn
- 2006-02-24 BR BRPI0609048A patent/BRPI0609048A2/en not_active IP Right Cessation
- 2006-02-24 KR KR1020077021831A patent/KR20070114296A/en not_active Application Discontinuation
- 2006-02-24 CA CA002596473A patent/CA2596473A1/en not_active Abandoned
- 2006-02-24 JP JP2007556471A patent/JP2008531285A/en not_active Withdrawn
- 2006-02-24 AU AU2006217571A patent/AU2006217571A1/en not_active Abandoned
- 2006-02-24 CN CNB200680006003XA patent/CN100528405C/en not_active Expired - Fee Related
- 2006-02-24 WO PCT/CA2006/000267 patent/WO2006089419A1/en active Application Filing
-
2007
- 2007-09-25 NO NO20074877A patent/NO20074877L/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348520A (en) * | 2009-03-12 | 2012-02-08 | 萨尔茨吉特法特尔有限公司 | Casting nozzle for a horizontal continuous casting system |
| CN102348520B (en) * | 2009-03-12 | 2014-04-16 | 萨尔茨吉特法特尔有限公司 | Casting nozzle for a horizontal continuous casting system |
| CN102596449A (en) * | 2009-10-21 | 2012-07-18 | Sms西马格股份公司 | Method and device for laterally guiding the flow of a metal melt during strip casting |
| CN102596449B (en) * | 2009-10-21 | 2014-11-26 | Sms西马格股份公司 | Method and device for laterally guiding the flow of a metal melt during strip casting |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080083524A1 (en) | 2008-04-10 |
| CN100528405C (en) | 2009-08-19 |
| AU2006217571A1 (en) | 2006-08-31 |
| CA2596473A1 (en) | 2006-08-31 |
| EP1858661A1 (en) | 2007-11-28 |
| NO20074877L (en) | 2007-11-23 |
| KR20070114296A (en) | 2007-11-30 |
| US20060191664A1 (en) | 2006-08-31 |
| WO2006089419A1 (en) | 2006-08-31 |
| BRPI0609048A2 (en) | 2016-11-29 |
| EP1858661A4 (en) | 2009-07-01 |
| JP2008531285A (en) | 2008-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100528405C (en) | Method of and molten metal feeder for continuous casting | |
| US5515908A (en) | Method and apparatus for twin belt casting of strip | |
| US20080032150A1 (en) | Casting steel strip with low surface roughness and low porosity | |
| EP2411171B1 (en) | Adjustable side dam for continuous casting apparatus | |
| US5363902A (en) | Contained quench system for controlled cooling of continuous web | |
| CA1296505C (en) | Continuous casting of thin metal strip | |
| EP1677927B1 (en) | Surface texturing of casting belts of continuous casting machines | |
| US6581675B1 (en) | Method and apparatus for continuous casting of metals | |
| CN1064870C (en) | Method and apparatus for direct casting of continous metal strip | |
| CN104511579A (en) | Roller belt type continuous casting machine and strip cast rolling device with same | |
| CN1069681A (en) | Thin strip continuous casting device | |
| AU692236B2 (en) | Method and apparatus for twin belt casting | |
| JPH01170553A (en) | Device for manufacturing rapid cooling metal thin strip | |
| US5143146A (en) | Casting of metal strip | |
| JPH02104448A (en) | Mold for continuous casting machine for thin cast billet | |
| JPS63154245A (en) | Continuous casting method for cast strip | |
| JPH09192790A (en) | Belt type continuous casting method | |
| JPH07276006A (en) | Twin belt type continuous casting method | |
| JPS6027448A (en) | Continuous casting method of steel plate | |
| JPH04238655A (en) | Belt type continuous casting method | |
| JPH03142050A (en) | Twin roll type continuous casting machine | |
| JPH0698465B2 (en) | Twin belt type continuous casting machine | |
| JPH05293602A (en) | Device and method for continuously casting thin metallic sheet | |
| JPS6127148A (en) | Method and device for horizontal and continuous casting | |
| JPH02133151A (en) | Apparatus for pouring molten metal in strip continuous casting machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20100224 |