CN-121988723-A - Casting method and casting device

Abstract

The invention provides a casting method and a casting device capable of preventing an oxide film from flowing into a product cavity of a casting mold and manufacturing castings with good quality. A casting method in which molten metal is filled into a product cavity from a molten metal holding furnace through a liquid collecting tank and a weir in this order, wherein a vortex and a wave generated in the liquid collecting tank by the molten metal are controlled by a control means, thereby preventing an oxide film generated by contact of the molten metal with air from flowing into the weir. As the control means, a rectifying plate, a baffle plate, or a casting mold having a pool shape that disperses the reflection direction of the molten metal generated at the pool end surface to eliminate the eddy current or the wave of the molten metal can be used.

Inventors

• YAMAZAKI TETSUYA

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251030

Priority Date

20241101

Claims (4)

1. 1. A casting method for filling a molten metal from a molten metal holding furnace into a product cavity through a liquid collecting tank and a weir in this order, characterized in that, The vortex and wave generated by the molten metal in the liquid collecting tank are controlled by a control means, thereby preventing the oxide film generated by the contact of the molten metal with air from flowing into the weir.
2. 2. The casting method according to claim 1, wherein, The control means is a rectifying plate or a baffle plate arranged in the liquid collecting tank.
3. 3. The casting method according to claim 1, wherein, The control means is a pool-shaped mold having a function of dispersing the reflection direction of the molten metal generated at the pool end surface to eliminate the eddy current or the wave of the molten metal.
4. 4. A casting device comprising a molten metal holding furnace, a liquid collecting tank, a weir, and a product cavity, characterized by comprising a control means, The control means controls the turbulence and waves generated by the molten metal in the liquid collecting tank, By the control means, the oxide film generated by the contact of the molten metal with air can be prevented from flowing into the weir.

Description

Casting method and casting device Technical Field The present invention relates to a casting method and a casting apparatus. Background As a method of casting a product, a low pressure casting method in which a molten metal holding furnace is pressurized or a reduced pressure casting method in which a mold is depressurized is known. Patent document 1 discloses a technique for preventing a molten metal from being filled poorly due to air remaining in a product cavity in a low pressure casting method. Patent document 1 Japanese patent laid-open publication No. 2020-6375 Disclosure of Invention In the technique described in patent document 1, a ventilation path is provided at a portion of the mold where air (gas) remains, and the air is sucked from the outside to be discharged, so that molten metal is introduced into the end of the product cavity. In general, in the casting method, molten metal is filled into a mold from a molten metal holding furnace through a liquid collecting tank, a weir, and a path of a product cavity (mold product portion). Here, in the molten metal path, particularly, the opening of the liquid collecting tank is large, and the contact area between the molten metal and the air is wide, so that a large amount of inclusions such as oxide films are easily generated. Therefore, the produced inclusions such as oxide film may flow from the weirs into the product cavity, and quality defects may occur. The present invention has been made in view of the above problems, and an object of the present invention is to provide a casting method and a casting apparatus capable of producing a casting of good quality by preventing an oxide film from flowing into a product cavity of a mold. In order to achieve the above object, one aspect is a casting method in which molten metal is filled from a molten metal holding furnace into a product cavity through a liquid collecting tank and a weir in this order, wherein a vortex and a wave generated in the liquid collecting tank by molten metal are controlled by a control means, and thereby an oxide film generated by contact of the molten metal with air is prevented from flowing into the weir. In order to achieve the above object, a casting apparatus includes a molten metal holding furnace, a liquid collecting tank, a weir, and a product cavity, wherein the casting apparatus includes a control means for controlling a vortex and a wave generated in the liquid collecting tank by the molten metal, and the control means can prevent an oxide film generated by contact between the molten metal and air from flowing into the weir. In the casting method and the casting apparatus according to the present invention, the control means for controlling the turbulence and the wave generated by the molten metal in the liquid collecting tank can prevent the oxide film generated by the contact between the molten metal and the air from flowing into the weir. Therefore, the casting method and the casting apparatus according to the present invention can be applied to a low-pressure or reduced-pressure casting method and a casting apparatus that suppress the mixing of oxide films. Effects of the invention According to the present invention, it is possible to provide a casting method and a casting apparatus capable of preventing an oxide film from flowing into a product cavity of a mold and producing a casting of good quality. Drawings Fig. 1 is a view showing an example of a casting apparatus according to the present embodiment. Fig. 2 is a view for explaining a vortex and a wave generated by the molten metal generated in the liquid collecting tank and an oxide film inflow weir generated by contact of the molten metal with air. Fig. 3 is a diagram for explaining an example of the casting method according to the present embodiment. Fig. 4 is a view showing another example of the casting apparatus according to the present embodiment. Fig. 5 is a view showing still another example of the casting apparatus according to the present embodiment. Detailed Description Hereinafter, a specific embodiment to which the present invention is applied will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments. The following description and drawings are appropriately simplified for clarity of description. Fig. 1,4 and 5 are diagrams each showing various examples of the casting apparatus 100 according to the present embodiment. Fig. 2 is a diagram for explaining a vortex and a wave generated by the molten metal generated in the liquid collecting tank, and an oxide film inflow weir generated by the contact of the molten metal with air. Fig. 3 is a diagram for explaining an example of the casting method according to the present embodiment. As described above, in the casting methods such as the low pressure casting method in which the molten metal holding furnace 1 is pressurized and the reduced pressure casting method in which the inside of t