Hot water supply device for metal casting

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 hot water supply device for metal casting.

Background Art

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

[0003] For example, in Patent Document 1 below, a ladle for scooping molten metal held in a holding furnace and pouring it into an injection sleeve, and when the ladle scoops the molten metal held in the holding furnace, an earth rod that is first immersed in the molten metal in the holding furnace, and a molten metal level detection rod that is subsequently immersed in the molten metal in the holding furnace. By having these, when both the earth rod and the molten metal level detection rod are immersed in the molten metal and electrically short-circuited, a molten metal level detection means for controlling the immersion amount of the ladle with respect to the molten metal level in the holding furnace, and a drive arm that moves 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 installed, a hot water supply device for metal casting is disclosed.

[0004] In the hot water supply device for metal casting disclosed in Patent Document 1, by using two molten metal level detection means, namely an earth rod and a molten metal level detection rod, the pouring amount of the molten metal scooped by the ladle is controlled.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in a hot water supply device for metal casting that scoops molten metal with a ladle, there may be floating substances such as small burrs floating on the surface of the molten metal held in a holding furnace in a molten state. In such a case, for example, if the hot water surface detection rod contacts the floating substance before contacting the hot water surface, the ladle will stop at a position higher than the appropriate position, so that the ladle may not be able to scoop an appropriate amount of molten metal, or there is a risk that the ladle cannot scoop any molten metal and a hollow casting may occur.

[0007] Conventional technologies for solving this type of problem include, for example, the above Patent Documents 2, 3, etc. That is, in the device disclosed in Patent Document 2, a wiper is installed to prevent floating substances such as oxide films floating on the surface of the molten metal from entering the ladle, and in the device disclosed in Patent Document 3, control is performed to add the operation of scraping the ladle when the ladle scoops the molten metal.

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

[0009] The present invention has been made in view of the problems existing in the above-described conventional technologies, and its purpose is to appropriately control the pouring amount of the molten metal scooped by the ladle by simply improving the existing hot water supply device for metal casting, and at the same time, appropriately prevent problems such as the occurrence of hollow casting due to the ladle being unable to scoop any molten metal. It is to provide a hot water supply device for metal casting.

Means for Solving the Problems

[0010] The present invention will be described below. For ease of understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated forms thereby.

[0011] The hot water supply device (10) for metal casting according to the present invention is a hot water supply device (10) for pouring molten metal held in a holding furnace (5) in a molten state into an injection sleeve (6) where die casting is performed. It 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 first immersed 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 liquid level detection rod (16) that is subsequently immersed in the molten metal in the holding furnace (5) following the earth rod (15). By having these, a liquid level detection means (13) for controlling the immersion amount of the ladle (12) with respect to the liquid level of the molten metal in the holding furnace (5) by causing both the earth rod (15) and the liquid level detection rod (16) to be immersed in the molten metal and electrically short-circuited, a drive arm (11) that moves the ladle (12) between the holding furnace (5) and the injection sleeve (6) and in which the earth rod (15) and the liquid level detection rod (16) constituting the liquid level detection means (13) are installed. Further, a portion of the earth rod (15) that contacts the liquid level of the molten metal is a flat plate member (17), and the plate member (17) has an inclined plane portion (17a) inclined with respect to the direction in which it is immersed in the liquid level of the molten metal.

[0012] In the hot water supply device (10) for metal casting according to the present invention, by arranging the inclined plane portion (17a) directly below the liquid level detection rod (16), the inclined plane portion (17a) can level the liquid level of the molten metal to a smooth liquid level before the liquid level detection rod (16) contacts the liquid level of the molten metal.

[0013] Also, in the hot water supply device (10) for metal casting according to the present invention, the central position of the inclined plane portion (17a) in plan view can be arranged directly below the liquid level detection rod (16).

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

Effect of the Invention

[0015] According to the present invention, by simply improving an existing hot water supply device for metal casting, it is possible to appropriately control the pouring amount of the molten metal scooped by the ladle, and to appropriately prevent problems such as the occurrence of a splash casting where the ladle cannot scoop any molten metal at all. It is possible to provide a hot water supply device for metal casting.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0017] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention.

[0018] FIG. 1 is a schematic diagram for explaining the overall configuration of the hot water supply device for metal casting according to the present embodiment. In FIG. 1, the right side of the paper is described as the rear side (that is, the side where the holding furnace 5 is installed), and the left side of the paper is described as the front side (that is, the side where the injection sleeve 6 is installed). Further, in FIG. 1, the state shown by the solid line indicates the initial state of the hot water supply device for metal casting, and it is shown that the hot water supply device for metal casting according to the present embodiment can move to the state shown by the broken line.

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

[0020] Now, as described above, the hot water supply device 10 for metal casting according to this embodiment is a device for pouring molten metal held in a molten state in the holding furnace 5 into the injection sleeve 6 where die casting is performed, and has a drive arm 11, a ladle 12, and a molten metal surface detection means 13.

[0021] The drive arm 11 is a robot arm installed on the base member 14 of the hot water supply device 10 for metal casting. It is configured to move the ladle 12, which will be described later, from the holding furnace 5 to the injection sleeve 6 by a link mechanism, and further to move from the injection sleeve 6 to the holding furnace 5.

[0022] The ladle 12 is installed at the tip of the arm of the drive arm 11. The ladle 12 according to this embodiment is a member for scooping up molten metal held in the holding furnace 5 and pouring it into the injection sleeve 6. In order to exhibit such a function, it is formed of a refractory material that can withstand repeated immersion in high-temperature molten metal. Regarding the constituent material of the ladle 12, in addition to the refractory material, a casting coated with a refractory material may also be used. The ladle 12 is provided at the tip of the arm of the drive arm 11 so as to be tiltable, and can preferably perform the operation of scooping up molten metal held in the holding furnace 5 and pouring it into the injection sleeve 6.

[0023] The molten metal surface detection means 13 according to this embodiment is composed of an earth rod 15 and a molten metal surface detection rod 16, and the molten metal surface detection means 13 composed of these earth rod 15 and molten metal surface detection rod 16 is installed with respect to the drive arm 11. Further, regarding the positional relationship between the earth rod 15 and the molten metal surface detection rod 16, the tip position of the molten metal surface detection rod 16 is arranged slightly above the tip position 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 first immersed in the molten metal in the holding furnace 5, and then the molten metal surface 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 surface detection rod 16 are immersed in the molten metal, the molten metal surface detection means 13 will be electrically short-circuited, so it becomes possible to control the immersion amount of the ladle 12 with respect to the molten metal surface in the holding furnace 5 by this short circuit. Furthermore, regarding the ladle 12 installed so as to be tiltable with respect to the drive arm 11, it is possible to control the tilt angle of the ladle 12 with respect to the drive arm 11. By controlling such a tilt angle and the immersion amount of the ladle 12 with respect to the molten metal surface by the above-described molten metal surface detection means 13, the ladle 12 and the molten metal surface detection means 13 cooperate to adjust the scooping amount of the molten metal by the ladle 12. That is, in the molten metal surface detection means 13 according to this embodiment, the amount of molten metal scooped by the ladle 12 is controlled by the tip position of the molten metal surface detection rod 16 and the tilt angle of the ladle 12.

[0024] As described above, the main constituent members of the hot water supply device 10 for metal casting according to this embodiment have been described. Next, with reference to FIG. 2 added as a reference drawing, the characteristic configuration of the hot water supply device 10 for metal casting according to this embodiment will be described. Here, FIG. 2 is an enlarged view showing an earth rod and a molten metal surface detection rod which are main parts of the hot water supply device for metal casting according to this embodiment.

[0025] As shown in FIG. 2, the earth rod 15 provided in the hot water supply device 10 for metal casting according to this embodiment is configured such that the part in contact with the molten metal surface is a flat plate member 17. Further, regarding the plate member 17, it is configured to have an inclined plane portion 17a inclined with respect to the direction of immersion in the molten metal surface.

[0026] In this embodiment, the plate member 17 including the inclined plane portion 17a is formed by bending a stainless steel plate material having a flat plate shape. Further, as shown in FIG. 2, the positional relationship between the ground rod 15 and the molten metal surface detection rod 16 is such that the inclined plane portion 17a is disposed directly below the molten metal surface detection rod 16, and the central position of the inclined plane portion 17a in plan view is disposed directly below the molten metal surface detection rod 16. With such a configuration, in this embodiment, before the molten metal surface detection rod 16 contacts the molten metal surface, the inclined plane portion 17a of the plate member 17 constituting the ground rod 15 can level the molten metal surface to make it a smooth molten metal surface. Therefore, even when floating substances such as small burrs and oxide films are floating on the molten metal surface, the inclined plane portion 17a can remove the floating substances and the molten metal surface detection rod 16 can detect the correct position of the molten metal surface.

[0027] In addition, as a result of the research efforts by the inventor, it has been clarified that for the inclined plane portion 17a of this embodiment, it is preferable to incline the plate member 17 constituting the ground rod 15 at an angle of 45 degrees to 60 degrees with respect to the direction in which the plate member 17 is immersed in the molten metal surface in order to remove floating substances.

[0028] Further, in this embodiment, with respect to the bending direction of the inclined plane portion 17a formed by bending the plate member 17, as shown in FIG. 2, the plate member 17 is bent so that a fold is formed obliquely with respect to the longitudinal direction of the plate member 17. In this way, since the inclined plane portion 17a located directly below the molten metal surface detection rod 16 is arranged at an angle in the oblique direction, it is possible to suitably remove floating substances floating on the molten metal surface.

[0029] According to the hot water supply device 10 for metal casting according to the present embodiment described above, by simply making a simple improvement to an existing hot water supply device for metal casting, it is possible to appropriately control the amount of hot water poured by the ladle 12, and it is possible to appropriately prevent problems such as the occurrence of a dry casting where the ladle 12 cannot scoop up any molten metal.

[0030] As described above, the preferred embodiments of the present invention have been explained. However, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or 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 form shown in FIG. 2, and can be bent in any direction and at any angle within the range where the same operational effects as those of the above-described embodiments can be exhibited.

[0032] Also, in order to protect the ground rod 15 and the liquid surface detection rod 16 that constitute the liquid surface detection means 13, adding a protective wall plate around the liquid surface detection means 13 or the like, that is, adding an additional member to the above-described embodiment of the present invention, is also included in the scope of the present invention.

[0033] It is clear from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Explanation of Reference Numerals

[0034] 5 Holding furnace, 6 Injection sleeve, 10 Hot water supply device for metal casting, 11 Driving arm, 12 Ladle, 13 Liquid surface detection means, 15 Ground rod, 16 Liquid surface detection rod, 17 Plate member, 17a Inclined plane portion.

Claims

1. A molten metal supply device for metal casting for pouring a molten metal held in a holding furnace in a molten state into an injection sleeve in which die casting is performed, a ladle for scooping up the molten metal held in the holding furnace and pouring it into the injection sleeve, when the ladle scoops up the molten metal held in the holding furnace, an earth rod that is first immersed in the molten metal in the holding furnace and a molten metal level detection rod that is subsequently immersed in the molten metal in the holding furnace following the earth rod. By having both the earth rod and the molten metal level detection rod immersed in the molten metal and electrically short-circuited, a molten metal level detection means for controlling the immersion amount of the ladle with respect to the molten metal level in the holding furnace, a drive arm that moves the ladle between the holding furnace and the injection sleeve and in which the earth rod and the molten metal level detection rod constituting the molten metal level detection means are installed, and further comprising, A molten metal supply device for metal casting, characterized in that a portion of the earth rod that contacts the molten metal level is a flat plate member and the plate member has an inclined plane portion inclined with respect to the direction in which the plate member is immersed in the molten metal level.

2. The molten metal supply device for metal casting according to Claim 1, wherein the inclined plane portion is disposed directly below the molten metal level detection rod, so that the inclined plane portion levels the molten metal level to a smooth molten metal level before the molten metal level detection rod contacts the molten metal level. A molten metal supply device for metal casting, characterized in that.

3. The molten metal supply device for metal casting according to Claim 2, A molten metal supply device for metal casting, characterized in that the central position of the inclined plane portion in plan view is disposed directly below the molten metal level detection rod.

4. The molten metal supply device for metal casting according to any one of Claims 1 to 3, wherein 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 molten metal level. A molten metal supply device for metal casting, characterized in that.

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