Metal-casting ladle-type metal-pouring device

Abstract

To appropriately control the amount of molten metal poured by the ladle without any problems through simple improvements.SOLUTION: A metal-casting ladle-type metal-pouring device 10 for pouring molten metal held in a state of being melted in a holding furnace 5 into an injection sleeve 6 where die casting is performed includes: a ladle 12; molten metal surface-detecting means 13; and a drive arm 11. In the metal-casting ladle-type metal-pouring device 10, a portion of the ground rod 15 that constitutes the molten metal surface-detecting means 13, the portion coming into contact with a surface of the molten metal, is a flat plate-shaped plate member 17; and the plate member 17 has a sloping plane part 17a that is inclined in a direction that is immersed in the surface of the molten metal.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a metal casting molten metal supply device. [Background technology]

[0002] Conventionally, there has been known a metal casting water supply system for pouring a molten metal held in a molten state in a holding furnace into an injection sleeve where die casting is performed. In this type of metal casting water supply system, it is necessary to control the amount of molten metal poured into the injection sleeve to an appropriate amount. Therefore, in the conventional technology, various methods have been used to control the amount of molten metal poured.

[0003] For example, Patent Document 1 listed below discloses a metal casting water supply system comprising: a ladle that scoops up molten metal held in a holding furnace and pours it into an injection sleeve; an earth rod that is immersed first in the molten metal in the holding furnace when the ladle scoops up the molten metal held in the holding furnace; and a molten metal level detection rod that is immersed in the molten metal in the holding furnace after the earth rod, thereby controlling the immersion amount of the ladle relative to the molten metal level in the holding furnace by having both the earth rod and the molten metal level detection rod immersed in the molten metal and electrically short-circuiting them; and a drive arm that moves the ladle between the holding furnace and the injection sleeve and on which the earth rod and molten metal level detection rod that constitute the molten metal level detection means are mounted.

[0004] In the metal casting molten metal supply device disclosed in Patent Document 1, the amount of molten metal poured by the ladle is controlled by using two molten metal level detection means, an earth rod and a molten metal level detection rod. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6435313 [Patent Document 2] Japanese Utility Model Application Publication No. 6-77963 [Patent Document 3] JP 2015-186821 A Summary of the Invention [Problem to be solved by the invention]

[0006] In a metal casting melt supply device that uses a ladle to scoop up molten metal, small burrs and other floating objects may be present on the surface of the molten metal held in a holding furnace. In such a case, if the ladle comes into contact with the floating object before the level detection rod comes into contact with the molten metal surface, the ladle may stop at a position higher than the appropriate position, which may result in the ladle being unable to scoop up the appropriate amount of molten metal or the ladle being unable to scoop up any molten metal at all, resulting in empty casting.

[0007] Conventional techniques for solving this type of problem include, for example, those disclosed in the above-mentioned Patent Documents 2 and 3. That is, in the device disclosed in Patent Document 2, a wiper is provided to prevent floating matter such as an oxide film floating on the surface of the molten metal from entering the ladle, and in the device disclosed in Patent Document 3, a control is performed to add a scraping action when the ladle scoops up the molten metal.

[0008] However, the conventional techniques disclosed in the above-mentioned Patent Documents 2, 3, etc. all have complex configurations and controls, and there is still room for improvement.

[0009] The present invention has been made in consideration of the problems existing in the conventional technology described above, and its purpose is to provide a water supply device for metal casting that, by simply making simple improvements to an existing water supply device for metal casting, can appropriately control the amount of molten metal poured by a ladle, and can appropriately prevent the occurrence of problems such as the ladle not being able to scoop up any molten metal, resulting in empty casting. [Means for solving the problem]

[0010] The present invention will be described below. In order to facilitate understanding of the present invention, reference numbers in the accompanying drawings are given in parentheses, but the present invention is not limited to the illustrated forms.

[0011] The metal casting molten metal supply device (10) according to the present invention is a metal casting molten metal supply device (10) for pouring molten metal held in a molten state in a holding furnace (5) into an injection sleeve (6) in which die casting is performed, and includes a ladle (12) for scooping up the molten metal held in the holding furnace (5) and pouring it into the injection sleeve (6), an earth rod (15) that is immersed first in the molten metal in the holding furnace (5) when the ladle (12) scoops up the molten metal held in the holding furnace (5), and a molten metal level detection rod (16) that is immersed in the molten metal in the holding furnace (5) after the earth rod (15), so that both the earth rod (15) and the molten metal level detection rod (16) are immersed in the molten metal in the holding furnace (5). and electrically short-circuiting the ladle (12) to control the immersion amount of the ladle (12) relative to the surface of the molten metal in the holding furnace (5); and a drive arm (11) for moving the ladle (12) between the holding furnace (5) and the injection sleeve (6) and on which the earth rod (15) and the molten metal level detection rod (16) constituting the molten metal level detection means (13) are mounted, the portion of the earth rod (15) that comes into contact with the surface of the molten metal being a flat plate member (17), and the plate member (17) has an inclined flat surface portion (17a) that is inclined with respect to the direction of immersion in the surface of the molten metal.

[0012] In the metal casting water supply device (10) of the present invention, the inclined flat surface portion (17a) is positioned directly below the molten metal level detection rod (16), so that the inclined flat surface portion (17a) can level the molten metal surface to make it smooth before the molten metal level detection rod (16) comes into contact with the molten metal surface.

[0013] In the metal casting molten metal supply device (10) according to the present invention, the center position of the inclined flat portion (17a) in a plan view can be disposed directly below the molten metal level detection rod (16).

[0014] Furthermore, in the metal casting water supply device (10) of the present invention, it is preferable that the inclined plane portion (17a) is inclined at an angle of 45 degrees to 60 degrees with respect to the direction in which the plate member (17) constituting the earth rod (15) is immersed in the surface of the molten metal. Effect of the Invention

[0015] According to the present invention, by simply making simple improvements to an existing metal casting water supply device, it is possible to provide a metal casting water supply device that can appropriately control the amount of molten metal poured by the ladle and can appropriately prevent the occurrence of problems such as the ladle not being able to scoop up any molten metal, resulting in empty casting. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic diagram for explaining the overall configuration of a metal casting hot water supply device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an enlarged view of an earth rod and a molten metal level detection rod, which are essential parts of the metal casting molten metal supply device according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and all of the combinations of features described in the embodiments are not necessarily essential to the solution of the invention.

[0018] Fig. 1 is a schematic diagram for explaining the overall configuration of the metal casting water heater according to this embodiment. In Fig. 1, the right side of the paper is the rear side (i.e., the side where a holding furnace 5 is installed) and the left side of the paper is the front side (i.e., the side where an injection sleeve 6 is installed). In Fig. 1, the state shown by the solid line shows the initial state of the metal casting water heater, and further, it is shown that the metal casting water heater according to this embodiment can be moved to the state shown by the dashed line.

[0019] As shown in Fig. 1, the metal casting water supply device 10 according to this embodiment is provided with a holding furnace 5 at the rear side and an injection sleeve 6 in which die casting is performed at the front side, and is disposed at a position between the holding furnace 5 and the injection sleeve 6. The holding furnace 5 holds a molten metal, and in this embodiment, the following description will be given on the assumption that the molten metal is an aluminum alloy. The injection sleeve 6 is a member that is connected to a die casting machine (not shown), and the molten metal is poured into the injection sleeve 6 and then cast into a cavity of the die casting machine (not shown), thereby producing a desired metal casting product.

[0020] As described above, the metal casting molten metal supply device 10 of this embodiment is an apparatus for pouring molten metal held in a molten state in the holding furnace 5 into the injection sleeve 6 where die casting takes place, and has a drive arm 11, a ladle 12, and a molten metal level detection means 13.

[0021] The drive arm 11 is a robot arm mounted on the base member 14 of the metal casting water supply device 10, and is configured to move the ladle 12 (described later) from the holding furnace 5 to the injection sleeve 6 via a link mechanism, and further move it from the injection sleeve 6 to the holding furnace 5.

[0022] A ladle 12 is provided at the arm tip of the drive arm 11. The ladle 12 according to this embodiment is a member that scoops up the molten metal held in the holding furnace 5 and pours it into the injection sleeve 6, and in order to perform this function, it is made of a refractory material that can withstand repeated immersion in high-temperature molten metal. The ladle 12 may be made of a refractory material or a cast iron coated with a refractory material. The ladle 12 is provided at the arm tip of the drive arm 11 so as to be tiltable, and can suitably perform the operation of scooping up the molten metal held in the holding furnace 5 and pouring it into the injection sleeve 6.

[0023] The molten metal level detection means 13 according to this embodiment is composed of an earth rod 15 and a molten metal level detection rod 16, and the molten metal level detection means 13 consisting of the earth rod 15 and the molten metal level detection rod 16 is installed relative to the drive arm 11. The earth rod 15 and the molten metal level detection rod 16 are positioned such that the tip of the earth rod 15 is slightly higher than the tip of the earth rod 15. Therefore, when the ladle 12 scoops up the molten metal held in the holding furnace 5, the earth rod 15 is immersed in the molten metal in the holding furnace 5 first, and then the molten metal level detection rod 16 is immersed in the molten metal in the holding furnace 5 following the earth rod 15. When both the earth rod 15 and the molten metal level detection rod 16 are immersed in the molten metal, the molten metal level detection means 13 is electrically short-circuited, and this short-circuit makes it possible to control the amount of immersion of the ladle 12 relative to the surface of the molten metal in the holding furnace 5. Furthermore, the ladle 12, which is installed so as to be able to tilt freely relative to the drive arm 11, can control the tilt angle of the ladle 12 relative to the drive arm 11, and by controlling this tilt angle and by controlling the amount of immersion of the ladle 12 in the molten metal surface by the molten metal level detection means 13, the ladle 12 and the molten metal level detection means 13 work together to adjust the amount of molten metal scooped up by the ladle 12. In other words, the molten metal level detection means 13 according to this embodiment controls the amount of molten metal scooped up by the ladle 12 according to the tip position of the molten metal level detection rod 16 and the tilt angle of the ladle 12.

[0024] The main components of the metal casting molten metal supply apparatus 10 according to this embodiment have been described above. Next, the characteristic configuration of the metal casting molten metal supply apparatus 10 according to this embodiment will be described with reference to Fig. 2. Fig. 2 is an enlarged view of the earth rod and molten metal level detection rod, which are essential parts of the metal casting molten metal supply apparatus according to this embodiment.

[0025] As shown in Figure 2, the earth rod 15 provided in the metal casting water heater 10 of this embodiment has a portion that comes into contact with the surface of the molten metal configured as a flat plate member 17, and further, the plate member 17 is configured to have an inclined flat portion 17a that is inclined with respect to the direction of immersion in the surface of the molten metal.

[0026] In this embodiment, the plate member 17 including the inclined flat surface portion 17a is formed by bending a flat stainless steel plate. The positional relationship between the earth rod 15 and the molten metal level detection rod 16 is configured such that the inclined flat surface portion 17a is located directly below the molten metal level detection rod 16 and the center position of the inclined flat surface portion 17a is located directly below the molten metal level detection rod 16 as shown in Fig. 2. With this configuration, in this embodiment, the inclined flat surface portion 17a of the plate member 17 constituting the earth rod 15 can level the molten metal level to make it a smooth molten metal surface before the molten metal level detection rod 16 comes into contact with the molten metal level. Therefore, even if floating objects such as small burrs or oxide films are floating on the molten metal level, the inclined flat surface portion 17a can remove the floating objects and the molten metal level detection rod 16 can detect the correct position of the molten metal level.

[0027] Furthermore, through the research efforts of the inventors, it has become clear that for the inclined flat surface 17a of this embodiment, it is preferable to incline the plate member 17 constituting the earth rod 15 at an angle of 45 degrees to 60 degrees with respect to the direction in which it is immersed in the surface of the molten metal in order to remove floating objects.

[0028] In this embodiment, the bending direction of the inclined flat portion 17a formed by bending the plate member 17 is, as shown in Fig. 2, bent so that a crease is formed obliquely with respect to the longitudinal direction of the plate member 17. In this way, the inclined flat portion 17a located directly below the molten metal level detection rod 16 is disposed at an oblique angle, so that floating objects on the surface of the molten metal can be suitably removed.

[0029] According to the metal casting water supply system 10 of this embodiment described above, by simply making simple improvements to an existing metal casting water supply system, the amount of molten metal poured by the ladle 12 can be appropriately controlled, and problems such as the ladle 12 being unable to scoop up any molten metal and resulting in empty casting can be appropriately prevented.

[0030] Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various modifications and improvements can be made to the above embodiments.

[0031] For example, the bending direction of the inclined plane portion 17a formed by bending the plate member 17 is not limited to the example shown in FIG. 2, and the plate member 17 can be bent in any direction and at any angle within a range in which the same effect as that of the above-described embodiment can be achieved.

[0032] Furthermore, in order to protect the earth rod 15 and the molten metal level detection rod 16 that constitute the molten metal level detection means 13, it is also within the scope of the present invention to add additional members to the above-described embodiment, such as providing a protective wall plate around the molten metal level detection means 13.

[0033] It will be apparent from the description of the claims that such modified or improved forms may also be included within the technical scope of the present invention. [Explanation of symbols]

[0034] 5 holding furnace, 6 injection sleeve, 10 metal casting molten metal supply device, 11 drive arm, 12 ladle, 13 molten metal level detection means, 15 earth rod, 16 molten metal level detection rod, 17 plate member, 17a inclined flat portion.

Claims

1. A metal casting water supply device for pouring molten metal held in a molten state in a holding furnace into an injection sleeve in which die casting is performed, comprising: A ladle for scooping the molten metal held in the holding furnace and pouring it into the injection sleeve; a molten metal level detection means for controlling the immersion amount of the ladle relative to the surface of the molten metal in the holding furnace by having an earth rod which is first immersed in the molten metal in the holding furnace when the ladle scoops up the molten metal held in the holding furnace and a molten metal level detection rod which is immersed in the molten metal in the holding furnace after the earth rod, so that both the earth rod and the molten metal level detection rod are immersed in the molten metal and electrically short-circuited; a drive arm for moving the ladle between the holding furnace and the injection sleeve, and on which the earth rod and the molten metal level detection rod constituting the molten metal level detection means are mounted; and A metal casting hot water supply device characterized in that the portion of the earth rod that comes into contact with the surface of the molten metal is a flat plate member, and the plate member has an inclined flat surface portion that is inclined with respect to the direction in which it is immersed in the surface of the molten metal.

2. The metal casting molten metal supply device according to claim 1, This metal casting water supply device is characterized in that the inclined plane portion is positioned directly below the molten metal level detection rod, and the inclined plane portion levels the surface of the molten metal to make it smooth before the molten metal level detection rod comes into contact with the surface of the molten metal.

3. The metal casting molten metal supply device according to claim 2, A molten metal casting molten metal supply device, characterized in that the central position of the inclined flat portion when viewed from above is located directly below the molten metal level detection rod.

4. The metal casting hot water supply device according to any one of claims 1 to 3, A metal casting hot water supply device, characterized in that the inclined plane portion is inclined at an angle of 45 degrees to 60 degrees with respect to the direction in which the plate member constituting the earth rod is immersed in the surface of the molten metal.

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