JPH084203Y2 - Lower mold for molten metal forging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lower die used for producing an annular product by a molten metal forging method.

(Prior art) Conventionally, in the manufacture of annular products by the molten metal forging method, the molten metal is injected into the product cavity by the ladle from the injection port provided on the die mating surface of the horizontal split die, and then the plunger is inserted from the die side. Then, the molten metal is generally pressurized.

(Problems to be solved by the invention) However, such a conventional method has a problem that it is difficult to inject a required amount of molten metal into the product cavity with high accuracy.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lower mold capable of accurately pouring a predetermined amount of molten metal into a product cavity.

(Means for Solving the Problems) In order to achieve the above object, the lower mold of the present invention is a lower mold of a molten metal forging device used for manufacturing an annular product by a molten metal forging method. The surface is provided with an indentation for manufacturing an annular product, and the height of the inner wall of the indentation is lower than the height of the die-matching surface. Further, at a substantially central position of the space surrounded by the annular recess. Forming a funnel-shaped injection hole having an upper end that communicates with the upper end of the inner wall of the recess and a lower end that communicates with the holding furnace through a stalk,
It is characterized in that the product cavity into which the molten metal is to be injected is defined only by the upper mold and the recess.

(Operation) In the lower mold thus constructed, the injection hole is communicated with the molten metal of the holding furnace through the stalk, and the upper mold is combined to define an annular product cavity. When the upper surface of the molten metal inside is pressurized and the molten metal is supplied from the injection hole through the stoke, the supplied molten metal is filled in the product cavity. Next, when the pressurization of the molten metal in the holding furnace is stopped, the molten metal in the injection hole and the stalk returns to the holding furnace, and as a result, the molten metal is supplied to the product cavity up to the height of the inner wall of the depression, Will be filled into the product cavity with high precision.

(Example) An example will be described with reference to the drawings. As shown in FIG. 1, a lower die (3) is attached to the upper surface of a lower die plate (2) having an opening (1). As shown in FIG. 2, the lower mold (3) has an annular recess (4) for manufacturing products, and the inner wall of the recess (4) has a height corresponding to that of the mold matching surface. A funnel-shaped injection hole that is constructed lower (see FIG. 1) and penetrates vertically to approximately the center of the space surrounded by the annular recess (4) and communicates with the upper end of the inner wall of the recess (4). (5) is formed. Further, as shown in FIG. 1, a molten metal holding furnace (6) is arranged immediately below the opening (1) of the lower die plate (2), and the injection hole (5) has an intermediate stalk (7). And through the stalk (8) into the holding furnace (6). Further, an upper die (9) is disposed above and below the lower die (3) so as to be able to move up and down through an upper die plate (10). A protrusion (9a) capable of defining an annular product cavity with the recess (4) of the mold (3) and a through hole (15) into which a plunger (12) described later can be inserted (is formed). (See FIG. 2). Further, a cylinder (1) facing downward is provided at a position directly above the upper die (9) in the upper die plate (10).
1) is installed, and the plunger (12) is fixed to the lower end of the piston rod of the cylinder (11). The plunger (12) defines the upper and lower molds (9) (3). Has a protrusion (12a) that can be inserted into the product cavity (see FIG. 2). Further, on the lower surface of the upper die plate (10), two downward facing cylinders (14) having push-out rods (13) that slidably penetrate the plunger (12) are mounted.

Next, the procedure for forging the molten metal using the apparatus configured as described above will be explained. After the molten metal is charged into the holding furnace (6), the upper die plate (10) is used to insert the upper die (9). Down to define an annular product cavity inward of the recess (4) with the lower mold (3), and then supply compressed air into the holding furnace (6) to raise the upper surface of the molten metal. Pressurized, which causes the molten metal in the holding furnace (6) to be injected through the stalk (8) and the intermediate stalk (7).
From inside to fill the product cavity. When the compressed air is discharged from the holding furnace (6) after the molten metal has been filled in the product cavity, the molten metal in the intermediate stalks (7) and stalks (8) returns to the holding furnace (6) and the second
As shown in the figure, the molten metal is depressed in the product cavity (4).
It is accumulated up to the height of the inner wall of the, and as a result, the molten metal is injected into the product cavity with high accuracy. Then
The cylinder (11) is extended to press the molten metal by the protrusion (12a) of the plunger (12) for pressure forging. After solidification of the forged molten metal, the upper die (9) for the product, the plunger (12), etc. are raised through the upper die plate (10),
Then, the cylinders (14) (14) are extended to push out the product from the upper mold (9) and the plunger (12) via the pushing rods (13) (13). Then the cylinder (11),
(14) is contracted to raise the plunger (12) and the push-out rod (13) to complete one cycle.

In the above embodiment, the protrusion (9) of the upper die (9) is used.
a) is configured to be inserted into the recess (4) of the lower mold (3) to define the product cavity, but the protrusion (9a)
Even when the product cavity is defined by the upper mold (9) and the lower mold (3) which do not have the same function and effect.

(Effect of the Invention) As is clear from the above description, if the lower mold of the present invention is used to define the product cavity, the product cavity can be formed by simply pressurizing the molten metal through the injection hole through the stalk. It has excellent practical effects such as the ability to inject molten metal with high precision.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional front view of a molten metal forging device using a lower mold of the present invention, and FIG. 2 is an enlarged vertical sectional view of a main part. (3): Lower mold, (4): Product manufacturing recess (5): Injection hole

Claims (1)

[Scope of utility model registration request] 1. A lower die for a molten metal forging device used for producing an annular product by a molten metal forging method, wherein a die (4) for producing an annular product is engraved on a die mating surface and the indentation is formed. The height of the inner wall of (4) is lower than the height of the mold-matching surface, and the upper end is vertically penetrated at the substantially central position of the space surrounded by the annular recess (4). A funnel-shaped injection hole (5) communicating with the upper end of the inner wall of (4) and with the lower end communicating with the holding furnace (6) through the stalks (7, 8) is formed, so that the molten metal should be injected. A lower mold for a molten metal forging device, characterized in that a product cavity is defined only by an upper mold (9) and the recess (4).