JP2008093695A - Apparatus for producing magnesium alloy ingot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing a magnesium alloy ingot excellent in the quality containing the surface which can be obtained without developing the difficulty on the mechanism. <P>SOLUTION: The apparatus produces the magnesium alloy ingot, so that the ingot can be obtained by pouring molten magnesium alloy into a mold from a molten metal pouring hole in a molten metal pouring nozzle and solidifying. This apparatus is provided with; a double structural cover case, in which a space exits between both of an outer cylinder and an inner cylinder, and both cylinders are connected through a ring piece at the upper part; a heat-insulating cylinder arranged in the inner peripheral part of the inner cylinder; the molten metal pouring nozzle penetratingly inserted in the axial direction of the inner cylinder at the inside of the heat-insulating cylinder; a heater wound on the outer peripheral part of the molten metal pouring nozzle; the mold arranged at the lower part of this cover case and this molten metal pouring nozzle; a sealing material arranged on the ring-shaped cover body of the mold faced to the outer cylinder of the cover case; and an ascending/descending device for cover case. The outer cylinder of the cover case is integrally ascended/descended with the molten metal pouring nozzle under state of slidingly moving to the seal material arranged on the cover body of the mold by operating the ascending/descending device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a manufacturing apparatus for a magnesium alloy ingot, and more particularly to a manufacturing apparatus capable of obtaining a magnesium alloy ingot having excellent quality including surface quality without any mechanical problems.

  Conventionally, as a production apparatus for obtaining an ingot of a magnesium alloy having a relatively low melting point, such as Mg-Al, Mg-Zn, Mg-rare earth element, generally, a melting furnace, a pump, a hot water supply pipe, It is equipped with a pouring nozzle and a mold, and the molten magnesium alloy pumped from the melting furnace is sent to the pouring nozzle through the hot water supply pipe and injected from the pouring port of the pouring nozzle into the mold to be solidified. What is made into an ingot by this is known. However, in such a conventional general manufacturing apparatus, since the molten metal is dropped into the mold from the pouring port of the pouring nozzle arranged facing upward in the mold, the molten metal collides with the molten metal surface in the mold at the time of dropping. Splashes are generated, which adhere unevenly to the inner peripheral surface of the mold and solidify, resulting in problems that the surface of the resulting ingot becomes uneven and double solidified skin occurs on the surface. The surface of the molten metal in the mold is irregularly disordered when falling, and solidification occurs unevenly, or it is solidified by entraining atmospheric gas. There's a problem. In the conventional general manufacturing apparatus described above, the surface quality of the obtained magnesium alloy ingot is poor.

In order to improve such a problem, the mold is supported so that it can be raised and lowered, and the mold is lowered in accordance with the injection of the molten magnesium alloy, thereby pouring the pouring nozzle of the pouring nozzle for pouring the molten metal into the mold and the molten metal surface in the mold. A manufacturing apparatus has been proposed that keeps the distance from the surface constant, and thus prevents splashing from occurring when the molten metal is dropped due to pouring or irregularly disturbing the molten metal surface (see, for example, Patent Document 1). A similar manufacturing apparatus is also proposed as an apparatus for manufacturing an aluminum alloy ingot or a zinc alloy ingot, although the difference is that a ladle is arranged in the middle without using a pump (for example, Patent Document 2). reference). However, in such a conventional manufacturing apparatus, since the mold is moved up and down with respect to the fixed pouring nozzle, it is difficult to ensure a sealing property between both of them that is in a considerably high temperature state. Since it is difficult to make a substantially oxygen-free atmosphere, there is a problem that the magnesium alloy melt and its ingot are easily oxidized and the quality is easily deteriorated. In addition, when manufacturing a large ingot or an ingot having a long dimension in the vertical direction, the conventional manufacturing apparatus needs to support a mold corresponding to these in a vertically movable manner. There is a problem that there is a remarkable overdoing.
JP 2004-66302 A JP-A-8-294767

  The problem to be solved by the present invention is to provide a manufacturing apparatus capable of obtaining a magnesium alloy ingot having excellent quality including surface quality without any mechanical problems.

  The present invention for solving the above-described problems is directed to a magnesium alloy ingot manufacturing apparatus in which a molten magnesium alloy is poured into a mold from a pouring port of a pouring nozzle and solidified to form an ingot. A cover case having a double structure connected to each other through a ring piece at an upper portion thereof, a heat insulating cylinder provided on an inner peripheral portion of the inner cylinder, and the heat insulating cylinder A pouring nozzle inserted through the inner cylinder in the axial direction, a heater wound around the outer periphery of the pouring nozzle, a cover case and a mold disposed below the pouring nozzle, A sealing material provided on the ring-shaped lid of the mold so as to face the outer cylinder of the cover case, and an elevating device for the cover case. The operation of the elevating device causes the outer cylinder of the cover case to Pouring hot water while sliding against the sealing material provided on the lid According to the manufacturing apparatus of the magnesium alloy ingot, characterized by comprising as to nozzle integrally with the lift.

  The magnesium alloy ingot manufacturing apparatus (hereinafter simply referred to as the manufacturing apparatus of the present invention) according to the present invention is also solidified by injecting molten magnesium alloy into the mold from the pouring nozzle of the pouring nozzle, as in the conventional manufacturing apparatus. As a result, an ingot is formed. Usually, it is equipped with a melting furnace, a pump, a hot water supply pipe, a pouring nozzle, and a mold, and the molten magnesium alloy pumped from the melting furnace is sent to the pouring nozzle through the hot water pipe. It is made into an ingot by pouring into a mold from a pouring port of a nozzle and solidifying it.

  The manufacturing apparatus of the present invention includes a double-structure cover case between the pouring nozzle and the mold. The cover case has an outer cylinder and an inner cylinder arranged in parallel with a space between the outer cylinder, and both are connected via an upper ring piece. A heat insulating cylinder is provided on the inner peripheral portion of the inner cylinder, and a pouring nozzle is inserted inside the heat insulating cylinder in the axial direction of the inner cylinder. The pouring nozzle is surrounded by the inner cylinder as a whole, and is therefore also surrounded by the heat insulating cylinder on the inner periphery thereof, but the pouring port is taken out from the tip of the inner cylinder through the heat insulating cylinder, A heater such as a sheath heater is wound around the outer periphery of the pouring nozzle surrounded by the inner cylinder.

  The mold is disposed below the cover case and the pouring nozzle, and the mold has a main body and a ring-shaped lid attached to the main body. A seal member is provided on the inner periphery of the ring-shaped lid so as to face the outer cylinder of the cover case, and usually a bearing is also provided, and the cover case is attached to the lifting device. By the operation of the lifting device, the outer cylinder of the cover case moves up and down integrally with the pouring nozzle while sliding with respect to the sealing material provided on the inner peripheral portion of the lid of the mold.

  In the manufacturing apparatus of the present invention, a considerably high temperature state is obtained by the heat insulating cylinder provided in the inner peripheral portion of the inner cylinder of the cover case and by the space formed between the inner cylinder and the outer cylinder of the cover case. In order to prevent the heat from the pouring nozzle to be transmitted to the sliding seal material of the outer cylinder, the material of the seal material can be expanded to a correspondingly low temperature, thereby the outer cylinder As a result, it becomes easy to ensure a substantially oxygen-free atmosphere in the mold, and as a result, the magnesium alloy melt and its ingot are prevented from being oxidized. To prevent quality degradation. Further, in the manufacturing apparatus of the present invention, in accordance with the rise of the hot water level in the mold, the pouring nozzle is raised integrally with the cover case by the operation of the lifting device, thereby bringing the pouring port close to the hot water surface. Preferably, the pouring spout can be slightly immersed in the molten metal below the surface of the molten metal, so that splashing occurs when the molten metal is dropped or the molten metal surface is irregularly disturbed. This can be prevented without difficulty, and as a result, a magnesium alloy ingot having excellent surface quality can be obtained without difficulty on the mechanism. According to the manufacturing apparatus of the present invention, an excellent quality magnesium alloy ingot including the surface quality can be obtained without any mechanical problems.

  In the production apparatus of the present invention, a heat insulating material such as alumina powder, magnesia powder, glass wool or the like is wrapped between the heat insulating cylinder and the pouring nozzle in a state of wrapping a heater wound around the outer peripheral portion of the pouring nozzle. Is preferably filled. This is because these heat insulating materials can assist the heat insulating cylinder to further enhance the heat insulating effect. Further, it is preferable to provide a water cooling jacket on the outer peripheral portion of the ring-shaped lid at a position facing the sealing material. This is because the sealing material can be cooled by such a water-cooling jacket, the usable sealing material can be expanded to a lower temperature range, and the sealing performance can be improved. Furthermore, it is preferable to provide an intake port on the ring-shaped lid. By connecting the intake port to a vacuum pump, for example, and operating the vacuum pump, the inside of the mold can be made substantially oxygen-free, and in some cases, the molten magnesium alloy can be sucked into the mold. Because. In the production apparatus of the present invention, the cover case is preferably made of iron, and the sealing material is made of resin or rubber, especially synthetic resin or synthetic rubber, particularly silicon rubber. It is preferable to do this. In any case, the desired effects required for it can be fully expressed in consideration of economic efficiency.

  According to the manufacturing apparatus of the present invention, an excellent quality magnesium alloy ingot including the surface quality can be obtained without difficulty in terms of mechanism.

  1 is a front view partially illustrating the manufacturing apparatus of the present invention in a longitudinal section, FIG. 2 is a partially enlarged longitudinal sectional view showing the same manufacturing apparatus of the present invention as FIG. 1, and FIG. 3 is the same manufacturing of the present invention as FIG. It is a partial expanded longitudinal cross-sectional view which shows an apparatus including the operation state. The illustrated manufacturing apparatus of the present invention includes a melting furnace 11, a pump 12, a hot water supply pipe 13 connected via a joint, a pouring nozzle 21, a cover case 31, a lifting device 41, and a mold 51. The molten magnesium A drawn from the melting furnace 11 by the pump 12 is sent to the pouring nozzle 21 through the hot water supply pipe 13 and injected into the mold 51 from the pouring port of the pouring nozzle 21 to be solidified. When the ingot is manufactured, the pouring nozzle 21 is moved up and down integrally with the cover case 31 by an elevating device 41 as will be described in detail later. Although the melting furnace 11 and the pump 12 are shown in FIG. 1, a ladle, a turn dish, or the like can be used instead of the melting furnace 11, and when these are arranged above the pouring nozzle 21, the pump is used. It can be omitted.

  The cover case 31 is provided between the pouring nozzle 21 and the mold 51, and the cover case 31 is arranged in parallel with an outer cylinder 32 and a space 33 between the outer cylinder 32. The outer cylinder 32 and the inner cylinder 34 are connected to each other via an upper ring piece 35. A heat insulating cylinder 36 is provided on the inner peripheral portion of the inner cylinder 34, and the hot water pouring nozzle 21 is inserted inside the heat insulating cylinder 36 in the axial direction of the heat insulating cylinder 36 and the inner cylinder 34. Accordingly, the pouring nozzle 21 is surrounded by the inner cylinder 34 and the heat insulating cylinder 36 as a whole, but the pouring port 22 at the front end passes through the heat insulating cylinder 36 and is taken out from the tip of the inner cylinder 34 to the outside. The heater 23 is wound around the outer periphery of the pouring nozzle 21 surrounded by the heat insulating cylinder 36.

  The mold 51 is arranged below the cover case 31 and the pouring nozzle 21, and the mold 51 has a main body 52 and a ring-shaped lid 53 attached to the main body 52. A cylindrical inner wall is raised on the inner peripheral portion of the ring-shaped lid 53, and the seal member 61 faces the outer cylinder 32 of the cover case 31 on the inner peripheral portion of the inner wall, and the bearing 62 sandwiches the seal material 61. The ring piece 35 of the cover case 31 is attached to the lifting device 41. By the operation of the elevating device 41, the outer cylinder 32 of the cover case 31 moves up and down integrally with the pouring nozzle 21 in a state of sliding with respect to the sealing material 61 provided on the inner peripheral portion of the inner wall of the lid 53 of the mold 51. It is the composition to do.

  In the illustrated manufacturing apparatus of the present invention, the alumina powder 24 is filled between the heat insulating cylinder 36 and the pouring nozzle 21 so as to wrap the heater 23 wound around the outer periphery of the pouring nozzle 21. A water cooling jacket 63 is provided on the outer peripheral portion of the inner wall of the ring-shaped lid 53 at a position facing the sealing material 61. Further, the ring-shaped lid 53 is provided with an intake port 64 connected to a vacuum pump (not shown). The cover case 31 is made of iron, the heat insulating cylinder 36 is made of alumina, and the sealing material 61 is an O-ring made of silicon rubber.

  In the illustrated manufacturing apparatus of the present invention, the heat insulating cylinder 36 provided on the inner peripheral portion of the inner cylinder 34 of the cover case 31 is formed between the inner cylinder 34 and the outer cylinder 32 of the cover case 31 in conjunction therewith. The space 33 and the water-cooling jacket 63 prevent the heat of the pouring nozzle 21 heated to the considerably high temperature by the heater 23 from being transmitted to the sealing material 61 on which the outer cylinder 32 slides, and the sealing material 61 In order to cool, the material of the sealing material 61 can be expanded to a material whose application temperature is correspondingly low, and this makes it easy to ensure the sealing performance between the outer cylinder 32 and the lid 53 of the mold 51. As a result, the inside of the mold 51 is easily made into an oxygen-free atmosphere, and as a result, the magnesium alloy melt and its ingot are prevented from being oxidized to prevent quality deterioration. Further, in the illustrated manufacturing apparatus of the present invention, the pouring nozzle 21 is raised integrally with the cover case 31 by operating the elevating device 41 in accordance with the rise of the molten metal surface in the mold 51, thereby the pouring port 22. Can be in a state of being slightly immersed in the molten metal under the surface of the molten metal (the state shown in FIGS. 2 to 3), splashing may occur when the molten metal is dropped, or the molten metal surface may be irregularly disturbed. As a result, an excellent surface quality magnesium alloy ingot can be obtained without any mechanical effort. According to the manufacturing apparatus of the present invention shown in the figure, a magnesium alloy ingot having excellent quality including surface quality can be obtained without difficulty on the mechanism.

The front view which illustrates the manufacturing apparatus of this invention partially in a longitudinal cross section. The partial expanded longitudinal cross-sectional view which shows the manufacturing apparatus of this invention same as FIG. FIG. 2 is a partially enlarged longitudinal sectional view showing the same manufacturing apparatus of the present invention as FIG. 1 including its operating state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Melting furnace 12 Pump 13 Hot water supply pipe 21 Pouring nozzle 22 Pouring port 23 Heater 31 Cover case 32 Outer cylinder 33 Space 34 Inner cylinder 35 Ring piece 41 Lifting device 51 Mold 52 Main body 53 Lid body 61 Sealing material 62 Bearing 63 Water cooling jacket 64 Air inlet A Molten metal

Claims (7)

  In a magnesium alloy ingot manufacturing apparatus in which a molten magnesium alloy is poured into a mold from a pouring port of a pouring nozzle and solidified to form an ingot, a space is formed between the outer cylinder and the inner cylinder. A cover case having a double structure connected through a ring piece at an upper portion thereof, a heat insulating cylinder provided on an inner peripheral portion of the inner cylinder, and an axial direction of the inner cylinder inside the heat insulating cylinder A pouring nozzle inserted into the pouring nozzle, a heater wound around the outer periphery of the pouring nozzle, a mold disposed under the cover case and the pouring nozzle, and a ring-shaped lid of the mold A sealing material provided facing the outer cylinder of the cover case, and an elevating device for the cover case. By the operation of the elevating device, the outer cylinder of the cover case is against the sealing material provided on the lid of the mold So as to move up and down integrally with the pouring nozzle while sliding It is comprised Te manufacturing apparatus of the magnesium alloy ingot, wherein.   The method for manufacturing a magnesium alloy ingot according to claim 1, wherein the heat insulating material is filled in a state where the heater is wrapped between the heat insulating cylinder and the pouring nozzle.   The manufacturing apparatus of the magnesium alloy ingot of Claim 1 or 2 with which the water cooling jacket was provided in the outer peripheral part of a ring-shaped cover body in the position facing a sealing material.   The apparatus for producing a magnesium alloy ingot according to any one of claims 1 to 3, wherein an air inlet is provided in the ring-shaped lid.   The apparatus for producing a magnesium alloy ingot according to any one of claims 1 to 4, wherein the cover case is made of iron.   The apparatus for producing a magnesium alloy ingot according to any one of claims 1 to 5, wherein the heat insulating cylinder is made of alumina. The apparatus for producing a magnesium alloy ingot according to any one of claims 1 to 6, wherein the sealing material is made of resin or rubber.

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