JP2008056981A - Method for melting additive, melting apparatus therefor, method for manufacturing zinc-based molded body and manufacturing apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an efficiency of melting an added additive in molten zinc and the quality of the molten zinc in which the additive has been added, by more surely melting the additive added into the molten zinc in a shorter time than that in a conventional method and uniformizing it in the molten zinc. <P>SOLUTION: An apparatus 2 for melting the additive is structured so as to have a channel 8 for passing the molten zinc (L) therein, and an adding section 25 for adding the additive (A) into the molten zinc (L) which passes through the channel 8. In addition, a gate 26 (27) provided with an aperture is installed in the channel 8 and the dimension of the aperture is set on the basis of the length of the channel 8 which is arranged in a downstream of the gate 26 (27). Furthermore, the aperture is formed so as to have a slit shape along the vertical direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a melting method and a melting apparatus for melting an additive in molten zinc, and a manufacturing method and a manufacturing apparatus for manufacturing a zinc-based molded body from molten zinc containing the additive.

  Since zinc reacts with oxygen in the air to produce an oxide film, it is preferred as a material for plating film as an anticorrosive and anticorrosive material for steel. In general, when a material to be plated such as steel is hot dip galvanized, the material to be plated is immersed in a hot dip galvanizing bath in which zinc is melted. Zinc used as a plating material is a zinc-based molded body such as an ingot, etc. in which elements are added and mixed in advance with zinc. These added elements are very important because they affect the finish and procedure of hot dip galvanizing. It is.

  For example, the amount of Al (aluminum) contained in the molten zinc in the plating bath affects the alloying reaction of Fe (iron) and Zn (zinc), and affects the corrosion resistance of the galvanized material to be plated. Is known to give. Further, it is known that the amount of Sb (antimony) contained in the molten zinc in the plating bath improves the aging plating releasability.

In the hot dip galvanizing technique described in Patent Document 1, Al is contained as an additive element in addition to zinc (Zn) in an amount of 0.1 to less than 0.2 wt%, Sb is contained in an amount of 0.1 to 0.5 wt%, and Fe (iron Pb (lead), Cd (cadmium), or Sn (tin) other than We manufacture excellent galvanized materials.
Japanese Patent Publication No.57-26155

  However, conventionally, when manufacturing a zinc-based molded body in which an element is added to zinc, which is a raw material of a hot dipping bath, zinc is melted in a crucible, and an ingot additive metal (added element) is added to the molten zinc in the crucible. ) Was added after pulverized and stirred to melt the added metal, and then the molten zinc in which the added metal was melted was cooled to produce a zinc-based molded body. In this conventional method, it takes a very long time to melt the additive metal. For example, when a conventionally known melting technique for an additive metal is used, the molten zinc to which the metal is added may have to be stirred for 2 hours or more, and the production efficiency is very poor.

  In addition, when an element having a specific gravity close to that of Zn (zinc), such as Sb (antimony), is added as an additive, the melting state of the additive cannot be grasped, and the additive is not completely melted. There was a risk of remaining. Thus, the zinc-based molded body produced from the additive-containing molten zinc in which the additive is not completely melted is segregated in the inside of the zinc-based molded body, resulting in variation in composition. However, it has been difficult to produce a zinc-based molded product with a desired composition by the manufacturing technology for zinc-based molded products. If there is a lump of Sb or the like in the zinc-based molded body, there is a problem that Sb adheres to the steel plate to be plated and causes poor plating.

  The present invention has been made in view of the above problems, and is an efficiency in which an additive added to molten zinc is uniformly melted and homogenized in molten zinc in a shorter time than before, and the additive added to molten zinc is melted. And the quality of the additive-containing molten zinc in which the additive is melted. Furthermore, when manufacturing a zinc-based molded object from an additive containing molten zinc, it aims at enabling manufacture of the zinc-based molded object of a composition nearer to a desired composition.

  In order to solve the above-mentioned problem, according to the present invention, melting of an additive is characterized by causing molten zinc to travel along a predetermined flow path and melting the additive in the flow path of the molten zinc. A method is provided.

  In the melting method of the additive, the step of melting the additive in the molten zinc flow path includes the first step of retaining the additive and melting the additive to a predetermined size or less, and the predetermined step And a second step of melting the additive melted to a size less than or equal to the predetermined flow path while proceeding along the predetermined flow path.

  In the additive melting method, the additive may contain an element having a specific gravity close to that of zinc.

  Further, according to the present invention, there is provided a method for producing a zinc-based molded article, wherein the additive-containing molten zinc obtained by melting the additive by the above-described melting method is cooled to produce a zinc-based molded article. Is done.

  In addition, according to the present invention, there is provided an additive melting apparatus, comprising: a flow path for propelling molten zinc; and an addition section for adding an additive to the molten zinc traveling in the flow path. Is done.

  In the additive melting apparatus, the flow path is provided with a gate having an opening, and the size of the opening is set based on the length of the flow path disposed downstream of the gate. It may be.

  In the additive melting apparatus, the opening may be formed in a slit shape along the vertical direction.

  In the additive melting apparatus, a plurality of the gates may be provided in the flow path.

  In addition, according to the present invention, there is provided a manufacturing apparatus for manufacturing a zinc-based molded body, characterized by having a mold for cooling the additive-containing molten zinc by the above-described melting apparatus and molding it into a zinc-based molded body. The

  According to the present invention, while the molten zinc is advanced along the predetermined flow path, the additive is melted in the molten zinc flow path, thereby ensuring that the additive is added to the molten zinc in a shorter time than before. Since it can melt | dissolve and it can make it uniform in molten zinc, it becomes possible to improve the productivity and quality of the additive containing molten zinc to which the additive was added. In particular, when the additive is melted in a retained state until it becomes a predetermined size or less, and is melted while advancing along the flow path after becoming a predetermined size or less, The melting is made more uniform in the molten zinc. Moreover, a zinc molded body free from segregation of additives can be manufactured by manufacturing a zinc-based molded body from the additive-containing molten zinc in which such additives are uniformly dissolved. Moreover, it is possible to make the zinc molded body a composition closer to the desired composition, thereby producing a high-quality zinc-based molded body having a desired composition according to a wide variety of uses and purposes. It becomes possible.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a configuration diagram of a zinc-based molded body manufacturing apparatus 1 according to an embodiment of the present invention. As shown in FIG. 1, the manufacturing apparatus 1 is a blending furnace 15 that keeps the molten zinc L to which the additive A has been added to the melting apparatus 2 for the additive that melts by adding the additive A to the molten zinc L. Are connected. As will be described later, a mold 20 is disposed below the blending furnace 15 so as to form a zinc-based molded body F.

  For example, the melting apparatus 2 discharges the molten zinc L from the molten metal container 5 filled with molten zinc L heated to 520 to 540 ° C. to the channel 8 below using a metal pump 6 as a discharging means. It is configured. The flow path 8 is connected to a blending furnace 15 disposed below the relay chamber 10 via a relay chamber 10 that relays the molten zinc L.

  The flow path 8 is arrange | positioned so that the mixing furnace 15 side may become low from the molten metal container 5. FIG. As a result, the molten zinc L discharged to the flow path 8 advances in the direction of the arrow shown in FIG. 1 by the pressure and gravity of the metal pump 6, relays in the relay chamber 10, and is supplied to the blending furnace 15. ing.

  The molten zinc L supplied to the blending furnace 15 is poured into the mold 20 below the blending furnace 15 and then cooled for a predetermined time to form a zinc-based molded body F. In the present embodiment, the turntable 21 provided with a plurality of molds 20 rotates at a constant speed in a horizontal plane, and the respective molds 20 are circulated sequentially directly below the tubular injection part 22 provided in the lower part of the blending furnace 15. It is configured to place. The injection part 22 is provided with an opening / closing valve (not shown), and the opening / closing valve (not shown) is opened at the timing when the mold 20 is arranged immediately below the injection part 22 by the rotation of the turntable 20. Is set. In the above description, the case of injecting molten zinc L into each mold 20 by opening / closing an on-off valve (not shown) provided in the injection unit 22 has been described. However, a necessary amount of molten zinc L is inclined by inclining the blending furnace 15. May be injected into each mold 20.

  In FIG. 1, among the molds 20 arranged on the turntable 21, the mold 20 into which the molten zinc L is injected is shown in black, and the mold 20 in an empty state is shown in white. The molten zinc L injected into the mold 20 is cooled while the turntable 21 is rotated to become, for example, a zinc-based molded body F such as an ingot, and is taken out before the mold 20 is again disposed immediately below the injection portion 22. Being transported.

  Below, the flow path 8 which advances the molten zinc L is demonstrated in detail. First, the part from the molten metal container 5 of the flow path 8 to the relay chamber 10 is demonstrated. A portion of the flow path 8 from the molten metal container 5 to the relay chamber 10 is arranged in a straight line when viewed from above, and an upper surface thereof is opened to form a U-shaped groove in cross section. As shown in FIG. 1, the flow path 8 includes an addition unit 25 for adding the additive A to the molten zinc L, a first gate 26, and a second gate 27 between the hot water container 5 and the relay chamber 10. These are provided in order along the traveling direction of the molten zinc L (the arrow direction in FIG. 1).

  FIG. 2 is a partial plan view of the flow path 8 provided with the addition portion 25, the first gate 26, and the second gate 27 as viewed from above. As shown in FIG. 2, in the addition part 25, the width | variety of the flow path 8 is widely set to ten parts so that the additive A added to the molten zinc L can be stored. Thereby, in the addition part 25, the additive A is appropriately supplied from above, and the molten zinc L flowing in the flow path 8 in the direction of the arrow shown in FIG. It is to be added. In the present embodiment, as additive A, for example, solid metal such as antimony (Sb) and aluminum (Al), or a lump of a master alloy composed of two or more metals is used, and proceeds to addition portion 25. The amount of additive A required to have a predetermined composition with respect to the amount of molten zinc L to be made is set.

  As shown in FIG. 2, the first gate 26 is provided on the addition portion 25 on the traveling direction side of the molten zinc L. FIG. 3 is a perspective view showing the configuration of the first gate 26. As shown in FIG. 3, the first gate 26 includes a rectangular parallelepiped support 35 that is constructed on both side walls 30 constituting the flow path 8 in the width direction of the flow path 8. Both ends of the support 35 are fixed to both side walls 30, for example, by welding. Five rod-shaped members 40 extend vertically downward on the support 35, and the lower ends of the five rod-shaped members 40 reach the bottom wall 36 constituting the flow path 8. These five rod-shaped members 40 are fixed to the support 35 by being fitted into holes provided in the support 35, for example. In the present embodiment, each of the rod-shaped members 40 has a substantially circular cross section.

  The five rod-shaped members 40 included in the first gate 26 are arranged at equal intervals along the width direction between the side walls 30 of the flow path 8. Between the rod-shaped members 40 and between the both side walls 35 and the rod-shaped members 40 of the flow path 8, slit-shaped openings 41 are formed along the vertical direction. In the present embodiment, a total of six openings 41 are formed in the first gate 26 with substantially the same size. As a result, when the molten zinc L flowing through the flow path 8 passes through the first gate 26, it passes through these six openings 41 and flows downstream.

  As shown in FIG. 2, a second gate 27 is provided downstream of the first gate 26. In the present embodiment, the width of the flow path 8 gradually decreases as it proceeds downstream from the first gate 26 and finally becomes a constant size. The second gate 27 is provided at a portion where the width of the flow path 8 is constant downstream of the first gate 26. FIG. 4 is a perspective view showing the configuration of the second gate 27. Note that the width of the flow path 8 from the first gate 26 to the second gate 27 may be constant.

  As shown in FIG. 4, the second gate 27 is configured in the same manner as the first gate 26 shown in FIG. 3, and is a rectangular parallelepiped constructed along the width direction on both side walls 30 of the flow path 8. The shaped support body 45 includes a plurality of rod-like members 50 that extend downward in the linear direction and reach the bottom wall of the flow path 8. The number of rod-like members 50 provided in the support 45 of the second gate 27 is set to two, and slit-like openings formed by the rod-like members 50, both side walls 30 of the flow path 8 and the bottom wall 36. The number of 51 is three. The slit width of the opening 51 formed in the second gate 27 is smaller than the slit width of the opening 41 of the first gate 26.

  Next, the part from the relay chamber 10 of the flow path 8 to the blending furnace 15 is demonstrated. The part of the flow path 8 from the relay chamber 10 to the blending furnace 15 is formed in a tubular shape. When the molten zinc L from the molten metal container 5 reaches the relay chamber 10, the flow direction from the relay chamber 10 to the blending furnace 15 is changed so that the molten zinc L collides with the wall of the relay chamber 10 and flows. The portion is disposed at a position that is off the extension line of the portion from the molten metal container 5 to the relay chamber 10. Thereby, when the molten zinc L passes through the relay chamber 10, a stirring flow is generated. In addition, although the part from the relay chamber 10 to the compounding furnace 15 may be arrange | positioned along the perpendicular direction, it arrange | positions so that the molten zinc L may stay longer in the relay chamber 10, and it inclines so that it may become longer It is preferable to do this. Further, a small chamber 60 in which the inner diameter of the flow path 8 is increased is provided between the relay chamber 10 and the blending furnace 15 for the purpose of stirring the molten zinc L. As a result, the molten zinc L flowing through the flow path 8 is agitated when passing through the small chamber 60, and the unevenness of the composition is reduced.

  The manufacturing method which manufactures the zinc-type molded object F using the manufacturing apparatus 1 which concerns on embodiment of this invention comprised as mentioned above is demonstrated.

  First, a method of melting the additive A added to the molten zinc L using the additive melting apparatus 2 according to the present embodiment included in the manufacturing apparatus 1 when the zinc-based molded body F is manufactured will be described. .

  The molten zinc L is filled in the molten metal container 5 and kept at a constant temperature of 520 to 540 ° C. or higher while stirring using a stirring device (not shown). In the present embodiment, an electric furnace such as a low frequency induction furnace is used as the molten metal container 5.

  As shown in FIG. 1, the molten zinc L that is uniformly maintained at a temperature of 530 ° C. or higher in the molten metal container 5 by stirring is discharged from the molten metal container 5 by the metal pump 6 and supplied to the flow path 8. In the present embodiment, a certain amount of molten zinc L required for one production is caused to flow through the flow path 8 from the inside of the molten metal container 5 by a load cell (not shown).

  The molten zinc L supplied to the flow path 8 travels in the arrow direction shown in FIG. 1 toward the relay chamber 10 along the flow path 8 by gravity, and reaches the addition section 25. In the additive portion 25, an amount of the additive A required to have a predetermined composition with respect to the amount of molten zinc L that proceeds from above the flow path 8 is added to the dimension of the opening 41 of the first gate 26. It is supplied in a larger solid form in advance. In addition, when the undissolved residue of this additive A exists, it can be determined that the composition of the manufactured zinc-based molded body F has deviated from the desired composition. In the present embodiment, the size of the opening 41 of the first gate 26 is set based on the length of the flow path 8 disposed downstream of the first gate 26. More specifically, the size of the opening of the first gate 26 is such that the solid-state additive A that has passed through the opening 41 and has progressed downstream of the first gate 26 includes the flow path 8 included in the melting device 2. The size is set such that it can be completely melted during the process.

  The molten zinc L that has reached the addition portion 25 melts the additive A in the addition portion 25, and the additive A is added to the molten zinc L. FIG. 5 is a side view of the additive portion 25 showing a state in which the additive A is melted in the molten zinc L. FIG. As shown in FIG. 5, the molten zinc L that has reached the upstream side of the first gate 26 has a higher liquid level indicated by the alternate long and short dash line due to the additive A disposed in the addition portion 25 (that is, the molten zinc L Deepens). Further, since the slit-shaped opening 41 of the first gate 26 is partially blocked by the additive A, a part of the molten zinc L flows backward as shown by the dotted arrow in FIG. Additive A is rotated. By this rotation, melting of the additive A by the molten zinc L is promoted.

  The additive A melted in the additive portion 25 and having a diameter smaller than the slit width of the slit-like opening 41 of the first gate 26 passes through the opening 41 of the first gate 26 and passes through the second gate. 27 is reached. However, since the slit width of the slit-shaped opening 51 of the second gate 27 is smaller than the slit width of the opening 41 of the first gate 26, the additive A is added to the opening 51 of the second gate 27. Can't pass through and is dammed up. The size of the opening 51 of the second gate 27 is the same as the size of the opening 41 of the first gate 26 described above, and is the length of the flow path 8 arranged downstream of the second gate 26. It is set based on.

  The additive-containing molten zinc L to which the additive A has been added in the addition unit 25 proceeds downstream of the addition unit 25 by gravity or the like, and passes through the first gate 26. The additive-containing molten zinc L is divided into six by the six openings 41 of the first gate 26 when passing through the first gate 26. The branched additive-containing molten zinc L passes through the six openings 41 of the first gate 26 and merges into one. In this way, when the additive-containing molten zinc L passes through the first gate 26, the diversion and merging are sequentially performed and effectively stirred.

  The additive-containing molten zinc L that has passed through the first gate 26 travels downstream along the flow path 8 due to gravity or the like, and passes through the second gate 27. Similarly to the case of passing through the first gate 26 when passing through the second gate 27, the additive-containing molten zinc L is divided and joined in order. Thus, the additive metal-containing molten zinc L is effectively stirred again by passing through the second gate 27.

  The additive-containing molten zinc L that has passed through the second gate 27 travels further downstream along the flow path 8 due to gravity or the like, and reaches the relay chamber 10. The flowing direction of the additive-containing molten zinc L that has reached the relay chamber 10 is changed and travels vertically downward in the flow path 8, and the additive-containing molten zinc L passes through the small chamber 60. Since the small chamber 60 has an inner diameter larger than that of the tubular flow path 8, when the additive-containing molten zinc L flows through the small chamber 60, the flow changes and the additive-containing molten zinc L is agitated. Is done.

  In addition, as already described in the second gate 27, the additive A that has passed through the opening 41 of the first gate 26 and is blocked is described in the case where the first gate 27 is described with reference to FIG. In the same manner as described above, the second zinc gas is rotated in the vicinity of the second gate 27 by the flow of molten zinc L. By this rotation, melting of the additive A by the molten zinc L is promoted also in the second gate 27, and the diameter of the additive A is further reduced. Eventually, the additive A has a diameter smaller than the slit width of the opening 51 of the second gate 27 and flows further downstream through the opening 51 of the second gate 27. Thus, when flowing downstream, the specific surface area of the additive A is very large, and since it flows while rotating, melting into the molten zinc L is promoted.

  The additive-containing molten zinc L that has passed through the small chamber 60 travels further downstream along the flow path 8 due to gravity or the like, and reaches the blending furnace 15. Thus, the procedure for melting the additive A added to the molten zinc L using the melting apparatus 2 is completed.

  Hereinafter, the procedure until the manufacture of the zinc-based molded body F is completed from the additive-containing molten zinc L added and melted by the melting apparatus 2 will be described.

  The additive-containing molten zinc L reaching the blending furnace 15 from the melting apparatus 2 is stored. Below the blending furnace 15, the turntable 20 rotates at a constant speed, and at the timing when the mold 20 is arranged immediately below the pouring part 22 due to this rotation, an on-off valve (see FIG. Not shown) is opened. Thereby, the additive-containing molten zinc L stored in the blending furnace 15 is injected into each mold 20 of the turntable 20. When the injection into the mold 20 is completed, the on-off valve (not shown) of the injection part 22 is closed. In the same manner, one by one is sequentially injected from the blending furnace 15 into each mold 20 of the turntable 20.

  The additive-containing molten zinc L injected into the mold 20 is cooled by a rotating turntable 21 and molded into a zinc-based molded body F such as an ingot, for example. In the present embodiment, the rotation period of the turntable 21 is set to be longer than a predetermined time required for cooling the additive-containing molten zinc L to form the zinc-based molded body F, and the turntable 21 rotates. As a result, the mold 20 containing the zinc-based molded body F is taken out again before reaching the position immediately below the injection port 22 and conveyed as a product.

  According to the above embodiment, the heated molten zinc L is advanced along the flow path 8, and the additive A is added and melted in the adding section 25, so that the molten zinc L is added in the proceeding molten zinc L. The product A can be reliably melted in a shorter time than before and can be made uniform in the molten zinc L. In particular, the additive-containing molten zinc L to which the additive A is added passes through the first gate 26 having the opening 41 and melts while being retained until the additive A becomes a predetermined size or less. In the case of melting while proceeding along the flow path 8 after being reduced to a predetermined size or less, the added additive A is dammed at the opening 41 of the first gate 26 and molten zinc L The additive A can be melted while being rotated by convection or the like, and the added additive A can be reliably melted in a short time by the molten zinc L and the composition thereof can be made uniform. For example, the melting time that takes 2 hours or more when the heater is melted in a conventionally known crucible can be melted in about 1 minute by using the melting apparatus 2 shown in FIG. Thereby, the working efficiency at the time of melting the additive A is greatly improved. Further, the additive A is prevented from remaining undissolved, and even if the additive A remains undissolved, it can be easily discriminated visually.

  Furthermore, in the case of the additive-containing molten zinc L melted with the additive A added as described above, the additive A is homogenized in the molten zinc L, so that it is cooled and zinc-based molded. When the body F is molded, the adjustment of the composition of the zinc-based molded body F to be manufactured is facilitated, and the zinc-based molded body F having a composition closer to the desired composition can be manufactured. Moreover, since the melting time of the additive A added to the molten zinc L is shortened, the production efficiency of the zinc-based molded body F is also improved.

  Further, the heated molten zinc L is advanced along the flow path 8, and after adding the additive A in the adding section 25, the shunting and merging are performed by passing through the first gate 26 having six openings 41. Can be performed in order, and the added additive A can be reliably mixed with the molten zinc L to make the composition uniform. Thereby, when the additive-containing molten zinc L to which the additive A is added is cooled to mold the zinc-based molded body F, the adjustment of the composition of the zinc-based molded body F to be manufactured is facilitated, and the desired composition It becomes possible to produce a zinc-based molded body F having a composition closer to the above.

  Further, after passing the first gate 26 through the additive-containing molten zinc L to which the additive A has been added, a second opening 51 having a slit width smaller than the opening 41 of the first gate 26 is provided. By passing through the gate 27, the additive A having a diameter smaller than the slit width of the opening 41 of the first gate 26 due to melting and passing through the opening 41 is the same as in the case of the first gate 26. Then, it can be melted while being rotated by the flow of the molten zinc L while being blocked by the opening 51 of the second gate 27. Further, similarly to the first gate 26, the diversion and merging can be performed in order, and the agitation can be performed again. From these points, the additive A having passed through the first gate 26 and having a smaller diameter can be reliably mixed with the molten zinc L to prevent undissolved residue and to make the composition more uniform. In addition, the melting time can be further shortened.

  Furthermore, by providing the relay chamber 10 that changes the flow of the molten zinc L in the flow path 8 and the small chamber 60 that is larger than the diameter of the flow path 8, the additive-containing molten zinc L is stirred, and the molten zinc L In the case where the additive A exists in a solid state, the additive A mixed in the molten zinc L is solidified by further melting before forming as the zinc-based molded body F. It is possible not to melt away. Further, the additive A mixed with the molten zinc L can be stirred to obtain a more uniform composition.

  In particular, an additive to which an additive A such as antimony (Sb) is added has a small specific gravity difference with respect to zinc (Zn), as in the case of producing a zinc-based molded body F used for a hot dip galvanizing bath. When the zinc-based molded body F is produced using the contained hot-dip zinc, the additive A and the hot-dip zinc L can be reliably mixed and homogenized, and the zinc-based molded body F optimum for the hot dip galvanizing process can be obtained. It becomes possible to manufacture. Thus, it becomes possible to manufacture a high-quality zinc-based molded body having a desired composition according to a wide variety of uses and purposes.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to the example which concerns. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention is also possible. It is understood that it belongs to.

  In the embodiment described above, the case where the additive A added to the molten zinc L is antimony (Sb) has been described. However, the additive A added to the molten zinc L may be antimony (Sb) such as aluminum (Al). Additives A other than) may be used.

  In the above-described embodiment, the case where the mold 20 for injecting and cooling the molten zinc L is provided on the rotary turntable 21 has been described. However, the mold 20 may be a turntable such as a slide support. It may be provided in addition to 21.

  In the embodiment described above, the case where the metal pump 6 is used as the discharging means for discharging the molten zinc L from the molten metal container 5 has been described. However, discharging means other than the metal pump 6 may be used, for example, The molten zinc container 5 may be inclined and the molten zinc L may be discharged by gravity.

  In the embodiment described above, the flow path 8 from the molten metal container 5 to the relay chamber 10 is disposed so as to be inclined so that the relay chamber 10 side is lower than the molten metal container 5 side, and from the relay chamber 10 to the blending furnace 15. The flow channel 8 is arranged along the vertical direction, and the case where the molten zinc L travels along the flow channel 8 mainly by gravity has been described. May be advanced along the flow path 8. Further, the flow path 8 may have a configuration other than the above.

  In the above-described embodiment, the case where the width of the flow path 8 is set to be 10 parts wide so that the additive A can be stored in the additive part 25 has been described, but instead of or in addition to this, the additive part 25, for example, a step is provided on the bottom wall 36 such that the bottom wall 36 on the upstream side of the first gate 26 is lower than the bottom wall 36 on the downstream side. You may comprise the inclination of the path 8 so that the molten metal container 5 side may become lower than the relay chamber 10 side.

  Although embodiment mentioned above demonstrated the case where the molten metal container 5 was electric furnaces, such as a low frequency induction furnace, the molten metal container 5 may be other than an electric furnace.

  In the above-described embodiment, the case where the number of the slit-like openings 41 included in the first gate 26 is six has been described, but the first gate 26 may include any number of openings 41. Good.

  In the above-described embodiment, the case where the number of the slit-like openings 51 provided in the second gate 27 is three has been described. However, the second gate 27 may include any number of openings 51. Good.

  In the above-described embodiment, the shape of the opening 41 provided in the first gate 26 and the shape of the opening 51 provided in the second gate 27 has been described as being a slit formed along the vertical direction. The shape with which the gate is provided may be any shape.

  In the embodiment described above, the case where the two gates 26 and 27 are provided in the flow path 8 has been described, but any number of gates may be provided in the flow path 8.

  A zinc-based molded body F is manufactured using the zinc-based molded body manufacturing apparatus 1 according to the embodiment of the present invention shown in FIG. 1, and the present invention is verified.

  FIG. 6 shows the deviation (weight percentage) of each component from the target value for the composition (weight percentage) of the zinc-based molded body produced using the production apparatus 1 according to the embodiment of the present invention shown in FIG. It is a table. In addition, when manufacturing a zinc-type molded object, predetermined amount Al and Sb were added as the additive A with respect to the molten zinc L of 1 ton, and it was made to melt. The melting time (flowing time of molten zinc L) is set to 1 minute, and Al and Sb remaining unmelted before the opening 41 of the first gate 26 and the opening 51 of the second gate 27 after melting are It did not exist.

  As shown in FIG. 6, the weight percentages of Al and Sb contained in 18 zinc-based molded bodies (samples Nos. 1 to 18) produced using the production apparatus of the present invention are almost unchanged, and both The values are very close to the target values (the target value of Al is 0.5 wt% and the target value of Sb is 0.3 wt%). Thus, according to the present invention, the melting time of the additive, which takes about 2 hours in the case of the conventionally known technique, can be shortened to 1 minute. In addition, there is no risk that Sb added to the molten zinc will remain, and in the unlikely event that Sb remains, the composition of the molten zinc to which the additive is added is confirmed by visual inspection (the above target). It is possible to determine that it is not (value). In addition, a uniform zinc-based molded body in which molten zinc is uniformly dispersed and the segregation of the additive in each mold and the dispersion of the additive between the molds is eliminated is manufactured. Furthermore, it becomes possible to obtain a zinc-based molded product having a composition closer to the desired composition.

  The present invention is particularly useful when applied to a production apparatus for producing a zinc-based molded body from, for example, molten zinc.

It is a block diagram of the manufacturing apparatus 1 of the zinc-type molded object which concerns on embodiment of this invention. It is the partial top view which looked at the flow path 8 in which the addition part 25, the 1st gate 26, and the 2nd gate 27 are provided from the top. 2 is a perspective view showing a configuration of a first gate 26. FIG. 3 is a perspective view showing a configuration of a second gate 27. FIG. FIG. 4 is a side view of the addition part 25 showing a state in which the additive A is melted into the molten zinc L in the addition part 25. It is the table | surface which showed the composition of the zinc-type molded object manufactured using the manufacturing apparatus 1 which concerns on embodiment of this invention shown in FIG. 1 with the gravity percentage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Zinc-type molded object manufacturing apparatus 2 Additive melting apparatus 5 Molten metal container 6 Metal pump 8 Flow path 10 Relay chamber 15 Mixing furnace 20 Mold 21 Turntable 22 Injection section 25 Addition section 26 First gate 27 Second gate 30 Side wall of flow path 35, 45 Support body 36 Bottom wall of flow path 40, 50 Rod-shaped member 41 Opening 60 Small room Additive A
Zinc-based compact F
Molten zinc L

Claims (9)

A method for melting an additive, characterized by causing molten zinc to travel along a predetermined flow path and melting the additive in the molten zinc flow path. The step of melting the additive in the flow path of the molten zinc includes the first step of retaining the additive and melting the additive to a predetermined size or less, and melting the additive to the predetermined size or less. The method for melting an additive according to claim 1, further comprising a second step of melting the additive while proceeding along the predetermined flow path. The method for melting an additive according to claim 1 or 2, wherein the additive contains an element having a specific gravity close to that of zinc. A zinc-based molded body characterized by cooling the additive-containing molten zinc obtained by melting the additive by the additive melting method according to claim 1 to produce a zinc-based molded body. Manufacturing method. A flow path for advancing molten zinc;
And an additive melting unit for adding an additive to molten zinc traveling in the flow path. A gate with an opening is provided in the flow path;
6. The additive melting apparatus according to claim 5, wherein the size of the opening is set based on the length of the flow path disposed downstream of the gate. The said opening part is formed in the slit shape along the perpendicular direction, The melting apparatus of the additive of Claim 5 or 6 characterized by the above-mentioned. The additive melting apparatus according to claim 5, wherein a plurality of the gates are provided in the flow path. A zinc having a mold for cooling the additive-containing molten zinc obtained by melting the additive by the additive melting apparatus according to any one of claims 5 to 8, and forming the zinc-based molded body. A manufacturing device for manufacturing a molded body.

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