US3862839A - Process for continuous production of a large sized zinc-base alloy ingot - Google Patents

Process for continuous production of a large sized zinc-base alloy ingot Download PDF

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US3862839A
US3862839A US344911A US34491173A US3862839A US 3862839 A US3862839 A US 3862839A US 344911 A US344911 A US 344911A US 34491173 A US34491173 A US 34491173A US 3862839 A US3862839 A US 3862839A
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furnace
molten
molten zinc
ingot
mold
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Katsumi Shimizu
Tokiziro Kuroda
Kenzi Komiya
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Mitsui Mining and Smelting Co Ltd
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Mitsui Mining and Smelting Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D5/00—Machines or plants for pig or like casting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces

Definitions

  • the present invention relates to a process for continuously producing a large-sized zinc-base alloy ingot (normally ⁇ called tailored zinc ingot) which is charged and melted into a plating bath when a galvanized sheet is produced.
  • the ingot in the production ofthe ingot, a large number of workers are required in each step, and at the tailored zinc melting furnace, zinc and desired alloying metal as the raw mateials are charged and melted to prepare a molten zinc base alloy having a predetermined composition, and the resulting molten alloy of a fixed amount is cast into a mold of a fixed size whose cross section is of almost concave rectangular parallelepiped type, and thereafter the ingot is pulled out from the mold, whereby the ingot is produced.
  • FIG. l is a flow sheet showing one embodiment of the process according to the present invention.
  • FIG. 2 is a top view of one embodiment of the apparatus for use in the second step of the present invention.
  • FIG. 3 and FIG. 4 are, respectively, a side view and a front view of the apparatus shown in FIG. 2.
  • FIG. 5 is a horizontal cross-sectional view of one ernbodiment of the alloying furnace for use in the third step of the present invention.
  • FIG. 6 is a vertical sectional view of the alloying furnace in FIG. 5.
  • FIG. 7 is a vertical sectional view of the alloying furnace in FIG. 5.
  • FIG. 8 is cross section along the line B B in FIG. 5.
  • FIG. 9 is a vertical cross section of the agitating means suitable for use in the alloying furnace in FIG. 5.
  • FIG. l0 is a chart graph showing the relation of amount of mixing raw materials in case the zinc base alloy of one example to be melted by the present invention in various mixing amounts, and showing the relation between the amount of the charged molten zinc and required time for melting the aluminum ingot.
  • FIG. 1l is a side view showing one embodiment of the apparatus in the fourth step of the present invention.
  • FIG. 12 is a plan view of the apparatus in FIG. 1l.
  • FIG. 13 is a flow sheet showing one example of the operating mechanism system of the fourth step of the present invention.
  • FIG. 14 is a plan view showing one embodiment of the fifth step of the present invention.
  • FIG. l5 is a longitudinal cross section showing the cross section of the mold portion in FIG. I4.
  • FIG. 16 is a transverse cross section showing the cross section of the mold portion in FIG. 14.
  • FIGS. 17, 18, 19 and 20 are cross sections of the coupling for rolling over the mold.
  • the purpose of the present invention isto provide a process for production of a large-sized tailored zinc ingot which is particularly suitable for the mass production system for satisfying the above-mentioned demands and also continuously and mechanically practicing the entire steps ranging from the preparation of the molten zinc base alloy after the melting treatment of the raw material to casting and withdrawing or pulling out of the ingot from the mold.
  • the zinc base alloy ingot for use in the production of galvanized iron sheet is allowed to have a certain variation as to its composition in accordance with the demand of users, but considerably strict or severe composition specifications have been applied.
  • a batch system capable of making adjustment of the alloy composition has been employed for the production of the molten zinc base alloy in the conventional production of the zinc base alloy ingot. Namely, the whole part or almost the whole part of the molten metal in the alloying furnace which has been produced by the first charging of the raw materials to be mixed is used for making the ingot, and then the next raw materials are charged and mixed, and thereafter the materials are melted and such operation has been repeated.
  • the melting method of the one batch system has been employed, and therefore an alloying furnace of relatively large capacity is required and, moreover during the melting period of the zinc base alloy by the charging of raw materials, the casting operation of the ingot .has to be suspended, and also durin g ⁇ the casting operation, the melting operation of the zinc base alloy has to be suspended.
  • the present inventors have developed in the first place an alloying furnace for melting the zinc base alloy which is capable of continuously operating the alloying furnace without interruption of the ingot casting operation.
  • the present invention consists of employment of the abovementioned improved alloying furnace and also of adding one or more improved features to this alloying furnace.
  • the purpose of the present invention is to provide a process for continuous production of a largesized zinc-base alloy ingot which comprises employing an alloying furnace comprising (i) a mixing furnace having at least one charging well provided with a side said both furnaces; introducing a certain amount of a molten zinc and at least one alloying metal ingot into said charging well while agitating said molten zinc introduced; repeating the introduction of said molten zinc and said alloying metal ingot at intervals of a fixed time, thereby a molten zinc-base alloy being continuously formed and intermittently overflowed beyond said partition wall from said mixing furnace into said muffle furnace; successively casting a certain amount of the resulting molten alloy into a large ingot by dipping up said molten alloy into a mold; and regulating an amount of introduction of molten zinc and alloying metal ingot per unit time so that the introducing amount of the raw material into said mixing furnace and the discharging amount of the molten alloy from said muffle furnace may be maintained in a state of approximately equilibrium
  • molten zinc molten zinc
  • it is designed so that even if a relatively small capacity molten zinc producing furnace (alloying furnace of FIG. l) is employed, the rate of operation of the furnace is raised, and also the molten zinc base alloy whose amount sufficiently meets the discharging amount of the melt comparable to that of a conventional furnace of large capacity is continuously produced. Therefore, the starting zinc metal which i's the basic main component of the zinc base alloy is used in the molten state. For this reason, the raw zinc material obtained ata zinc-refinery, for example, distillation zinc, electrolytic zinc, refluxed zinc, etc.
  • the electrolytic zincmelting furnace or distllation zinc-melting furnace as shown in FlG. l in the first place, and it is maintained in the molten state at an appropriate temperature range.
  • the molten metal holding furnace is used instead of using the melting furnace mentioned above, and the raw zinc material may be temporarily charged and retained in such holding furnace.
  • the starting zinc materials have variable impurity components vdepending on the refining method, and therefore in the allowable component range, one or more kinds of such raw zinc materials may be preferably used after mixing thereof.
  • FIG. I illustrates the case where two kinds of raw zinc materials are employed.
  • any melting furnaces having the conventional structure can be used, but it is necessary for such furnaces to be provided with the well for dipping up the molten metal at the suitable side wall of the furnace.
  • Step of continuous dipping up and charging of fixed amount of molten zinc This second step is a step for dipping up the molten zinc of the raw material which is produced in the above-mentioned first step in a fixed amount and then it is charged into the third step of zinc base alloy producing furnace (alloying furnace). ln this step any apparatus capable of charging a fixed amount of molten zinc to the alloying furnace sequentially can be employed, but it is preferable to use the apparatus to be described in the following.
  • the well is provided for at least one raw zinc material melting furnace or the holding furnace as mentioned above, and a pump for maintaining the level of the surface of the molten zinc in the well constant is installed in the vicinity of the well in order to cause overflow of the molten zinc by pouring the molten zinc constantly into the well from the furnace, and it is preferable to employ an apparatus for dipping up in a fixed amount the molten zinc charged into the well from the raw zinc material melting furnace or the holding furnace and charging it from the well into the alloying furnace.
  • a machine frame 3 is assembled above the upper part ofa well 2 provided on the side wall of the raw zinc material melting furnace l, and a motor 4 and a reduction gear 5 are installed in said machine frame.
  • This motor 4 (Bayer cyclo variable speed motor) is capable of changing speed in the range of from 6.1 to 24.4 r.p.m. and the speed of rotation of cam shaft 8 can be Vregulatedtothe range of from 2.2 to 8.8 r.p.m. by the combination of the gears 6 and 7.
  • a cam 9 is fitted and fixed to the cam shaft, and a suspending angle 11 is provided on a-suspending fixture l0 which is rotatable and being fitted into a channel of said cam 9.
  • a rod l5 for effecting vertical movement of a dipper 12 is pivotally connected to this angle 11.
  • a molten metal dipper l2 is connected to rod 1S.
  • the dipper l2 is supported by a supporting fixture 13 at its one end, and a trough 14 for transfer of the molten metal is provided adjacent the wall of the well 2.
  • the suspending angle ll is made to move vertically by the rotation of the cam 9, and the dipper l2 is made to move in a seesaw stroke by this motion with the supporting fixture 13 serving as the fulcrum.
  • the molten zinc in the well 2 is always maintained constant, the molten zinc is dipped up by a fixed amount at a time, and as shown in FIG. 3 by the arrow, it is discharged to the trough 14.
  • the seesaw stroke of the dipper will become more preferable when the dipper is made to move vertically by the suspending angle l1 and when the rod l5 is pivotally supported by means of a supporting fixture 16 which is used as the fulcrum. It desirable to place a balance weight 17 on one end of the rod 15 connected to the dipper so as to make the movement easy, as shown in FIG. 3.
  • the amount of the molten metal dipped up per l hour can be regulated to be in the range of from 9,200 kg to 37,000 kg.
  • the molten metal continuously overflows the well 2 from the raw zinc material melting furnace 1 and returns to the melting furnace and the amount of molten metal dipped up by the dipper 12 for one operation can be regulated by making the level of the surface of the molten zinc 18 constant, and the rotational frequency of the cam shaft 8 is set to a predetermined value, whereby the amount of molten metal dipped up per unit time can be regulated.
  • the molten metal feeding apparatus for feeding molten zinc from the raw material zinc melting furnace 1 to the well 2
  • an apparatus having a considerably a large molten metal feeding capacity as compared with the dipping up amount per unit time becomes necessary, and with the employment of this apparatus, the molten zinc is fed to the well 2 and the molten zinc is made to overflow and return from the well to the furnace and thus the level of the molten zinc in the well 2 can be maintained constant.
  • the trough 14 for transferring the molten zinc is capable of continuously charging the dipped up molten zinc into the mixing furnace of the alloying furnace as shown in FIG. l. Also, there is an advantage that particularly, if variable speed motor is used as the motor 4, the dipping up amount of the molten zinc of the dipper 12 in a fixed time can be regulated by merely setting the speed to a fixed value.
  • an apparatus for feed a fixed amount of molten zinc to the third step which apparatus comprises (I) a molten metal feeding apparatus provided in conjunction a zinc melting furnace having at least one well, said feeding apparatus having a capacity sufficient to hold the level of the surface of moltenv zinc constant and capable of constantly feeding the molten zinc to the well from the melting furnace, (II) a machine frame assembled on the well, (III) a variable speed motor installed on the machine frame, (lV) a suspending angle that moves vertically by the rotation of the cam, said angle being fitted to the cam coupled to the shaft of the motor, (V) a trough for feeding the molten zinc provided in the vicinity of the well, and (VI) a dipper connected to the suspending angle, said dipper being supported in such a way that its one end is dipped in the well at the
  • Step of continuous production of zinc base alloy This third step is a step in which a fixed amount of at least one alloying metal for alloying with a fixed amount of molten zinc which has been charged from the well 2 is charged and melted to produce zinc base alloy having a desired composition, and the resulting molten alloy is supplied to the fourth step of casting a fixed amount of the molten alloy continuously.
  • an alloying furnace in which a mixing furnace having at least one opening for introduction of the raw material or a recess for introduction of the raw material which is generally called the well, is connected to a muffle furnace which is heated by the combustion of air-gas (or liquid) fuel, and a partition wall is provided at said connecting portion.
  • an overflowing channel for example, a gap is formed in the space formed by the furnace cover wall or a communicating hole capable of flowing the molten metal at a suitable height of the partition is formed, or a recess is formed on the upper end portion of the partition, and when the molten zinc base alloy in the mixing furnace reaches the fixed level, the molten zinc base alloy overflows the partition and flows into the muffle furnace.
  • the alloying furnace to be employed in the third step of the present invention has the foregoing structure, and it can be easily constructed by connecting the mixing furnace of the foregoing structure to the conventional alloying furnace or building a chamber corresponding to a mixing furnace mentioned in the present invention as part of a conventional alloying furnace.
  • the third step of the present invention has a feature in which the molten zinc base alloy having a desired composition is produced in the mixing furnace by means of the partition in the alloying furnace, and this resulting molten zinc base alloy is transferred and flowed into the muffle furnace sequentially, and thus the ingot casting operation is not required to be interrupted orsuspendedat all.
  • the raw material charging and mixing and melting are repeated intermittently in the mixing furnace, whereby the increased volume of the molten zinc base alloy in the mixing furnace occurs, andan operation is carried out so that the molten zinc base alloy having a desired composition only is fed sequentially to the muffle furnace.
  • numeral 3l is a mixing furnace-and 32 is a muffle furnace.
  • the molten zinc is charged into a well 33 by trough 14 at a selected rate, and a fixed amount of the alloying metal ingot, for example, aluminum ingot is charged into the well.
  • the bottom of well 33 communicates with mixing furnace 3l.
  • the charging of the aluminum ingot can be carried out, as shown in FIG. 1, by using a suitable charger capable of charging the aluminum ingotat a desired time.
  • Numeral 35 is an opening for insertion of an agitating rod or an agitation means, and the agitating rod or agitation means is inserted through the opening to agitate the molten zinc to accelerate the speedy melting of the alloying metal.
  • the well 33 is provided with a mounting position 34 of the agitating means, and at this position, the melting and alloying can be accelerated.
  • Numeral 37 is a partition arid as shown ⁇ in FIG.
  • an overflowing channel 38 is formed on the center of the upper end of the partition 37 to accelerate the overflow of the molten zinc, and the portion of the molten zinc base alloy whose amount has been increased by the newly charged raw material only passes the overflowing channel 38 and flows into the muffle furnace 32.
  • Numerals 39, 40, 41 are openings for heating burners, and thus the solidification of the molten zinc base alloy at the mixing of the molten zinc and the alloying metal by the direct heating of the combustion gas of the burners can be prevented, and also fluidity is improved.
  • the molten metal which has been alloyed with a desired composition and sequentially overflowed is introduced from the molten metal inlet 48 to the muffle furnace 32, and its temperature is retained at a temperature suitable for casting the zinc base alloy ingot by blowing the combustion gas from the openings 39, 40 and 41 along the muffle wall 49 in FIG. 6 and FIG. 7. And then the combustion gas is led to a discharge opening 36 through the mixing furnace 31 and is discharged in the upper direction.
  • the molten zinc base alloy in the muffle furnace 32 enters from the molten metal discharge port 47 provided at the bottom of the furnace to a well 50 and a suitable amount of the molten zinc base alloy from the well 50 is cast into the molds for casting the ingot.
  • numerals 42, 43, 44, 45 and 46 are ports for removing slag in the furnace, and in the present invention, it is preferable to provide at least one port for removing the slag as mentioned above.
  • the furnace wall, partition wall and well in the alloying furnace mentioned above are constructed with refractory bricks capable of withstanding the molten metal, and a part of the entirety of the surface of the furnace wall portion may be reinforced preferably by a iron or steel shell. Also, in order to maintain a proper temperature range of the molten metal in the alloying furnace, it is desirable to regulate the temperature by adjusting the amount of combustion gas by providing measuring holes 51 and 52 for measuring the combustion exhaust gas tempeature and measuring holes 54 and 55 for measuring molten bath temperature.
  • a smoke stack for combustion exhaust gas is installed on the upper part of the exhaust gas opening 36 of the mixing furnace 31.
  • the agitation in the mixing furnace 31 and well 33 may be accomplished by using an iron or steel rod, but in order to avoid as much as possible the contamination of the molten zinc base alloy, it is preferable to use, for example, the agitation means as shown in the appended FIG. 9 which rotates and agitates the molten metal by the motor drive by inserting an agitating rod made of refractory substance, for example, silicon carbide rod attached with agitating vanes at its tip.
  • an agitating rod made of refractory substance for example, silicon carbide rod attached with agitating vanes at its tip.
  • FIG. 9 is a vertical cross section of the agitation means, and it includes a coupling 64 is fitted to an end portion 63 of a supporting shaft of an impeller 6l having an agitating vane 62 at its lower end portion, and they are arranged to be rotated as a unit.
  • the impleller 6l can be prepared by mixing a suitable binder into silicon carbide and sintering it at high temperature after forming it to a desired shape.
  • the impeller 6l can be prepared by sintering or melting and casting one or more kinds of substances such as other refractory substances, for example, zirconia, alumina, silica, and magnesia, and or it may be formed by a thermal resistance steel material.
  • a coupling 64 for use in connecting the impeller 6l and the rotating shaft 65 a flange coupling as shown in FIG. 9 is preferable.
  • a roller bearing 67 and a radial bearing 68 are fitted into both end portions of the shaft.
  • the roller bearing is retained at a fixed position by means of a washer 69 for a bearing and a nut 70 for the bearing, and both its end portions are sealed by oil seals 71 and 72.
  • the radial bearing 68 similar to the roller bearing 67, is retained at a fixed position by means of a washer 73 for the bearing and a nut 74 for bearing, and both its end portions are sealed by means of oil seals 75 and 76.
  • the water jacket 66 is employed for preventing the shaft 65 and these bearing mechanisms from being overheated by heat conduction and radiant heat from the molten metal, and also for effecting smooth rotational operation.
  • This waterjacket 66 consists of cylindrical double side walls and having a space 77 through which water flows, and cooling water is introduced from a plug 78 of the outside wall, and it is discharged from a plug 79.
  • V-belt pulley 82 for effecting rotation of the shaft.
  • a metal fixture 84 for fixing the water jacket 66 to a suitable machine frame is provided on the jacket to prevent vibration of the shaft 65 and also to prevent the weight of the agitation means from being applied on the furnace cover fire resistance bricks 83.
  • a socket tube-like sealing vane 85 is fixed and the vane is fitted into a channel 87 of the sealing ring 86 fixed to the furnace cover fire resistance brick, and a low melting point metal, for example, lead, is filled in the channel.
  • a low melting point metal for example, lead
  • the purpose of feeding zinc in the molten state into the well 33 is to effect complete mixing of the molten zinc base alloy
  • the molten zinc base alloy in order to supply into the alloying furnace the molten zinc base alloy in an amount nearly equivalent to an amount of the molten zinc base alloy to be discharged or dipped up .for ingot casting from the alloying furnace, it is effective to supply the zinc which is the principal component of the casting ingot composition in the molten state.
  • the agitation for accelerating the alloying process is carried out in the mixing furnace by means of the agitation means mentioned in the foregoing.
  • FIG. 10 is a diagram showing with curve l the relation between the charging amount of raw material zinc and the charging amount of aluminun ingot in the case of producing a molten zinc base alloy having about 0.23 wt% of aluminum content in the mixing furnace, and also showing with curve 2 the relation between the required time for ideal melting (minutes) of the aluminum ingot in the charged zinc raw material as shown in the curve l and the charging amount of the zinc.
  • the molten zinc base alloy is discharged from the alloying furnace at a rate of about 6 tons per l hour, the aluminum ingot that is melted is 13.8 kg per one hour according to the curve 1, and the molten zinc base alloy thus formed has to be supplied to the alloying furnace.
  • the required time for ideal melting mentioned above means a value which is obtained for determining the time (minutes) required for melting the 5 kg aluminum ingot in relation to the supply rate of the molten zinc mentioned above. Accordingly, when the molten zinc base alloy is required to be produced at a rate of about 12 tons per l hou-r, it is necessary to charge one 5 kg aluminum ingot, about each l 1 minutes. In this case, about 2.2 tons of the molten zinc base alloy is produced about each ll minutes.
  • Table l are values obtained when three aluminum ingots weighing 5 kg per ingot were added to about 6.5 tons of moltenzinc, and the molten zinc was agitated by steel rod with hand working, and a molten zinc base alloy having about 0.23% of aluminum content was produced. It has been confirmed that results similar to the Table l were obtained for the melting condition of the aluminum ingot the weight of one ingot being about 2 kg, about 3 kg and about 4 kg, respectively.
  • the temperature of the molten zinc varies according to the discharging amount of the molten zinc base alloy discharged from the alloying furnace per unit time in the fourth step to be mentioned hereinafter, it is preferable to hold the molten zinc charged from the second step into the well 33 of the mixing furnace 3l to at least about 500C, and with such temperature control, molten zinc base alloy can be produced at u rate of 30 to 50 tons per hour.
  • the molten zinc base alloy which has been produced in the mixing furnace 3l by the first charging of the raw materials can have a desired range of composition withfrespect to the zinc base alloy ingot, namely the specified component content range of said composition can be properly maintained because as only the molten zinc base alloy corresponding to the quantitatively increased amount caused by the second charging of the raw materials is introduced into'the muffle furnace 32 by means of passage 38.
  • an operation of feeding molten zinc base alloy whose composition has been controlled is repeated intermittently. Therefore, it is possible to supply the molten alloy from the mixing furnace 3l into the muffle furnace 32 in amounts of the molten alloy per unit time corresponding to the amounts intermittently removed from the mufe furnace and by properly regulating the cycle time of such intermittent feeding operation.
  • the molten zinc base alloy corresponding to the amount of molten zinc base alloy to be fed for normal casting in the fourthvstep of the process or more than such amount can be retained in the muffle furnace of the alloying furnace.
  • the casting operation of the molten alloy and the melting operation of the raw materials can be almost continuously carried out without any interruption of the operation.
  • the third step of the present invention is explained using the aluminum ingot as the alloying metal in the foregoing, but it goes without saying that besides the aluminum ingot, any type of materials such as zinc base alloy containing aluminum, magnesium, copper, etc., or various kinds of alloying components which are demanded by users can be alloyed in molten zinc by treating them similar to theecase of the aluminum ingot.
  • such alloying metal can be charged in fixedl amount into the mixing furnace by a mechanical means, and when the fixed amount of charging of the alloying metal is synchronized with the fixed amount of charging of the molten zinc whichk corresponds nearly to the amount of the molten zinc base alloy to be discharged from the alloying furnace, the third step can be carried out easily by a small number of workers. Furthermore, in the third step, the molten zinc base alloy can be produced nearly continuously, even if the amount of molten zinc base alloy to be consumed per unit time becomes considerably large, the alloying furnace itself can be made of relatively small capacity.
  • the use of the raw material ,zinc in the molten state is a necessary condition, and for this reason, it is necessary to employ the melting furnace for the zinc raw material or the molten metal holding furnace as described in the first step, but even when using the various kinds of raw zinc materials whose contents of lead, iron and/or cadmium, etc., are different, there is an advantage that the contents of the components contained in the molten zinc can be easily regulated by changing the mixing amounts of the raw zinc materials in the mixing furnace.
  • the raw zinc material can be obtained in the molten state, and in such a case, these raw zinc materials can be utilized in the present invention as is, and thus the heating expense for melting can be saved.
  • Step of automatic casting of fixed amount of molten zinc base alloy This fourth step is a step for sequentially casting a fixed amount of the molten zinc base alloy into a mold automatically which alloy having the desired composition has been produced and having a desired in the third step. And in this fourth step there is employed an apparatus for casting a fixed amount of the molten alloy, said casting apparatus being installed in conjunction with the well 50 of the alloying furnace of the third step.
  • the casting apparatus comprises a level detecting apparatus for detecting the level of the surface of the molten alloy at a fixed position when the molten alloy is cast into the mold and a dipping up apparatus for dipping up and casting a fixed amount ofthe molten alloy into the mold from the alloying furnace, and they are installed at the positions shown in FIG. l.
  • this casting apparatus starts to operate when the mold is stopped at the immediately preceding position of the casting apparatus, while the operation is arranged to take place on the basis of a command from the surface level detecting apparatus and that electromagnetic switches and limit switches are provided at each operating portion in the respective apparatuses, and each said operating portion is arranged to make a fixed time operation by the operating commands.
  • FIG. 1l is a side view of the casting apparatus installed in association with the well 50 of the alloying furnace
  • FIG. l2 is a plan view of the apparatus of FIG. 1l.
  • the surface level detecting appara tus 91 and the dipping up apparatus 92 are installed nearly in series.
  • the mold 93 is set on the mold supporting fixture 96 movably supported by wheels 94 and 95.
  • the mold is directly below the detecting apparatus 91 by means of angles 97 connected to the mold driving apparatus which is not shown in the drawing. At this time the mold is in nearly parallel with the well 50.
  • the supporting shaft of this mold 93 is made eccentric and permits inversion of the mold, and it has been devised so that the ingot after the completion of the casting is easily removed by inverting the mold when it reaches a location spaced from the casting apparatus. As to this type of ingot inversion and removal, they will be described in the fifth step to be provided hereinafter.
  • the supporting fixture 96 ofthe mold is a circular turn table, and a drive apparatus is installed in its center or its outer periphery.
  • a drive apparatus is installed in its center or its outer periphery.
  • Several pieces of angles 97 are provided for carrying the molds, and the mold can be sequentially transported through an arc of 360 rotation.
  • the stopping of the mold 93 at a fixed position can be made by transmitting the operating command of the limit switch to the mold driving apparatus.
  • the limit switch is installed at a position for contacting the mold 93 and at a position close to the said fixed position. Simultaneous with the stopping of the mold driving apparatus, the casting apparatus starts its operation.
  • a carbon electrode 98 of the detecting apparatus 91 is made to decend to a fixed position by means of a cylinder 99 (compressed air cylinder) for lifting or lowering the carbon electrode.
  • a pouring port 101 of a trough of dipping up apparatus 92 for dipping up the molten alloy from the well 50 is made to decend to a fixed position by means of acylinder 102 (oil pressure cylinder).
  • a dipping up pump 103 for dipping up the molten alloy starts to operate.
  • This dipping up pump 103 consists of an air motor 104, a compressed air feeding pipe 105 and a molten metal pumping pipe 106.
  • the lower end portions of the compressed air feeding pipe 105 and the pumping pipe 106 are arranged to force the molten alloy at the end portion of the pumping pipe to the molten alloy discharge port 109 by the compressed air from the end portion of the feeding pipe 105 at the bottom portion of the well 50 of the alloying furnace.
  • the molten alloy from the discharge port 109 is charged into the mold 93 by lowering the trough 100, and the surface of the charged molten alloy rises in the mold.
  • both terminals of an electromagnet 110 disposed on the upper part of the electrode are shortcircuited and thus the electromagnet starts to operate.
  • a switch mechanism is constructed in such a way that the operation of the electromagnet 110 of the level detecting apparatus 92 is effected by connecting one terminal of the electromagnet with the electrode 98 and the other terminal to a suitable portion of the mold whereby the pow'er source is switched on by the contact of the surface of the molten alloy and the electrode. when this switch is turned on, the carbon electrode is attracted by means of the electromagnet and is separated from the surface of the molten metal.
  • the electromagnet 110 and the carbon electrode 98 are iointly lifted above the mold 93 by the lifting of the arm of the cylinder 99 for lifting the electrode, Simultaneous with the operation of the electromagnet 110 mentioned above, the operation of the dipping up pump 103 stops and the arm of the cylinder 102 for lifting the pouring port 101 is lifted, and the molten alloy remaining in the trough 100 and the molten alloy fed to the said trough by the rotation of the air motor 104 for driving the pump 103 are respectively returned to the well 50. It is possible, however, to charge all of the remaining molten alloy in the trough into the mold by delaying the operation of the cylinder for lifting the trough 100 by means of a timer. Namely, the trough 100 is caused to make as oscillating or seesaw movement by the operation of the cylinder for lifting or lowering the pouring port by making the

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  • Metallurgy (AREA)
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  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Forging (AREA)
US344911A 1972-04-01 1973-03-26 Process for continuous production of a large sized zinc-base alloy ingot Expired - Lifetime US3862839A (en)

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JP47032860A JPS5120293B2 (no) 1972-04-01 1972-04-01

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US (1) US3862839A (no)
JP (1) JPS5120293B2 (no)
BE (1) BE797635A (no)
CA (1) CA997154A (no)
DE (1) DE2316045C3 (no)
ES (1) ES413243A1 (no)
FI (1) FI56778C (no)
IT (1) IT980731B (no)
NL (1) NL7304406A (no)
NO (1) NO142563C (no)
ZM (1) ZM5673A1 (no)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999982A (en) * 1974-10-31 1976-12-28 Societe Miniere Et Metallurgique De Penarroya Process for preventing the oxidation of liquid zinc
US5597289A (en) * 1995-03-07 1997-01-28 Thut; Bruno H. Dynamically balanced pump impeller
AU676486B2 (en) * 1992-09-14 1997-03-13 Wenmec Systems Oy Method and apparatus for producing metal objects
US6019576A (en) * 1997-09-22 2000-02-01 Thut; Bruno H. Pumps for pumping molten metal with a stirring action
US20040026061A1 (en) * 2000-09-29 2004-02-12 Ernest Hamilton Method and apparatus for casting metal
US20040221981A1 (en) * 2003-05-05 2004-11-11 Outokumpu Oyj Aluminum ingot casting machine
CN102836969A (zh) * 2012-09-26 2012-12-26 江苏正达炉料有限公司 一种合金成形生产设备
CN109676094A (zh) * 2019-02-28 2019-04-26 长沙有色冶金设计研究院有限公司 一种浇铸装置、铸锭***及铸锭方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2806934C3 (de) * 1978-02-17 1982-01-07 Naučno-issledovatel'skij institut special'nych sposobov lit'ja, Odessa Automatische Anlage zum Gießen in ausgekleidete Kokillen
JP4934879B2 (ja) * 2006-08-30 2012-05-23 Ｄｏｗａメタルマイン株式会社 添加物の溶融方法及び亜鉛系成形体の製造方法
DE102014104509A1 (de) * 2014-03-31 2015-10-01 Thyssenkrupp Ag Vorrichtung und Verfahren zur Reinigung einer Schmelze und Schmelztauchbeschichtungsanlage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509079A (en) * 1946-06-25 1950-05-23 New Jersey Zinc Co Casting metal
US3247555A (en) * 1964-11-23 1966-04-26 Monarch Aluminum Mfg Company Aluminum melting furnace
US3467167A (en) * 1966-09-19 1969-09-16 Kaiser Ind Corp Process for continuously casting oxidizable metals
US3556354A (en) * 1968-04-30 1971-01-19 Respond Inc Ladle trap chamber and tilting dispenser
US3659644A (en) * 1968-05-15 1972-05-02 Metallurgie Hoboken Apparatus for the casting of metal anodes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509079A (en) * 1946-06-25 1950-05-23 New Jersey Zinc Co Casting metal
US3247555A (en) * 1964-11-23 1966-04-26 Monarch Aluminum Mfg Company Aluminum melting furnace
US3467167A (en) * 1966-09-19 1969-09-16 Kaiser Ind Corp Process for continuously casting oxidizable metals
US3556354A (en) * 1968-04-30 1971-01-19 Respond Inc Ladle trap chamber and tilting dispenser
US3659644A (en) * 1968-05-15 1972-05-02 Metallurgie Hoboken Apparatus for the casting of metal anodes

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999982A (en) * 1974-10-31 1976-12-28 Societe Miniere Et Metallurgique De Penarroya Process for preventing the oxidation of liquid zinc
AU676486B2 (en) * 1992-09-14 1997-03-13 Wenmec Systems Oy Method and apparatus for producing metal objects
US5597289A (en) * 1995-03-07 1997-01-28 Thut; Bruno H. Dynamically balanced pump impeller
US6019576A (en) * 1997-09-22 2000-02-01 Thut; Bruno H. Pumps for pumping molten metal with a stirring action
US20040026061A1 (en) * 2000-09-29 2004-02-12 Ernest Hamilton Method and apparatus for casting metal
US6805190B2 (en) * 2000-09-29 2004-10-19 Outokumpu Oyj Method and apparatus for casting metal
WO2004098813A3 (en) * 2003-05-05 2005-06-09 Outokumpu Oy Aluminum ingot casting machine
WO2004098813A2 (en) * 2003-05-05 2004-11-18 Outokumpu Oyj Aluminum ingot casting machine
US20040221981A1 (en) * 2003-05-05 2004-11-11 Outokumpu Oyj Aluminum ingot casting machine
US20060016576A1 (en) * 2003-05-05 2006-01-26 Outokumpu Oyj Aluminum ingot casting machine
US7308929B2 (en) 2003-05-05 2007-12-18 Outotec Oyj Aluminum ingot casting machine
US7406997B2 (en) 2003-05-05 2008-08-05 Outotec Oyj Aluminum ingot casting machine
US20080277091A1 (en) * 2003-05-05 2008-11-13 Outotec Oyj Aluminum ingot casting machine
US7637304B2 (en) 2003-05-05 2009-12-29 Outotec Oyj Aluminum ingot casting machine
CN102836969A (zh) * 2012-09-26 2012-12-26 江苏正达炉料有限公司 一种合金成形生产设备
CN109676094A (zh) * 2019-02-28 2019-04-26 长沙有色冶金设计研究院有限公司 一种浇铸装置、铸锭***及铸锭方法

Also Published As

Publication number Publication date
JPS5120293B2 (no) 1976-06-24
ES413243A1 (es) 1976-01-01
DE2316045A1 (de) 1973-10-04
JPS48100316A (no) 1973-12-18
NO142563C (no) 1980-09-10
DE2316045B2 (de) 1978-06-29
DE2316045C3 (de) 1979-03-29
BE797635A (fr) 1973-07-16
NO142563B (no) 1980-06-02
NL7304406A (no) 1973-10-03
IT980731B (it) 1974-10-10
FI56778B (fi) 1979-12-31
FI56778C (fi) 1980-04-10
CA997154A (en) 1976-09-21
ZM5673A1 (en) 1973-12-21

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