JPH0442029Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a punching pin device for forming holes in a product part during mold casting.

(Prior art) During mold casting, a punching pin is used to form a hole or hole in a cast product, and the punching pin is, for example, provided to hang down and protrude from the mold matching surface of the upper mold in the direction of the product cavity. The pin sometimes functions as a core in the product part, and when the mold is opened, the pin is removed from the product part, and after being removed, a casting hole or a casting hole is formed.

As shown in FIG. 4, the conventional casting pin device has a lower die 51, side dies 52 and 53, an upper die 54, and a molding block 55 provided under the upper die, which forms a product cavity 5.
6 is formed, and a die pin 57 is vertically hung down through the upper die 54 and the molding block 55.
The lower part 57a is suspended facing the cavity 56, the cavity 56 is filled with molten metal, and a casting hole (hole) is formed with a casting pin 57. The pin 57 is hollow and has a cooling water supply pipe 58 inside for circulating cooling water.

(Problem that the invention aims to solve) By the way, the above-mentioned casting pin becomes deformed and worn out due to repeated extreme temperature changes, repeated removal from the product part during mold release, etc., and needs to be replaced. , conventionally, the casting pin 57 is attached to the upper die 54 and the forming block 55.
Since the upper mold is formed in one piece with the upper mold passed through vertically, in order to attach or remove the upper mold, it is necessary to remove the upper mold from the molding block and pull it out toward the back of the upper mold, or to install it from the back of the upper mold. Such attachment/detachment work is troublesome because it involves disassembling the mold, which has a large external shape and is heavy.
This method is disadvantageous in that it is complicated and takes a long time.

This idea was created in view of the above problems.
The purpose of this is to make it simple and easy to attach and detach the casting pin when replacing it, and in a short period of time.

(Means for solving the problem) A means for solving the above problem is to use a casting mold in which a casting pin can be freely attached to a cooling holder equipped with a cooling water passage communicating with the cooling water inlet and outlet. In the casting pin device, one end side of the cooling holder faces the mold matching surface, and the cooling holder is provided with a large diameter hole that opens to the mold matching surface, and a female thread having a smaller diameter than the large diameter hole is provided in the cooling holder. A part is provided inside the mold and communicates with the large diameter hole, while a male threaded part is screwed into the female threaded part of the cast pin, and a large diameter part is fitted into the large diameter hole. is provided so that it can be mounted from the mold matching surface side of the mold, and a hexagonal part is provided in the exposed part to the mold matching surface side adjacent to this large diameter part.

(Operation by the above means) According to the above means, by opening the mold, holding the hexagonal part with a tool, and threading the casting pin, the pin can be removed from the mold matching surface side.

(Embodiment) Next, a preferred embodiment of the present invention will be described based on the accompanying drawings.

Figure 1 is a longitudinal sectional view of the casting pin in the mold closed state, Figure 2
The figure is a sectional view taken along the line 2-2 in FIG. 1, and FIG. 3 is an exploded view showing the state in which the casting pin is removed and removed or installed.

In the embodiment, the mold 1 consists of an upper mold 3 attached and held on the lower surface of the die base 2, and a lower mold 4 facing the upper mold 3. A product cavity 5 is provided below the mold mating surface 4a of the lower mold 4. Reference numeral 5 shows only the casting pin part, and a vertical space 5a that is open to the mold matching surface 3a of the upper die 3 and closed by the mold matching surface 3a, and a lateral communication space 5b are illustrated. There is. Upper mold 3
A hole 6 having a larger diameter than the space is provided vertically in a portion facing the space 5a, and the hole 6 has a large diameter in the upper half 6a and a small diameter in the lower half 6b. A stepped portion 6c is formed. The cooling holder 7 is fitted into the hole 6.

The cooling holder 7 has an upper half 7a that has a large diameter and fits into the upper half 6a of the hole 6, and a lower half 7b that has a small diameter and fits into the lower half 6b of the hole 6. The holder 7 is positioned in the axial direction by abutting the flange portion 7c against the stepped portion 6c of the hole 6, and a plurality of sealing materials 8 are provided around the upper half portion 7a at intervals in the axial direction.
...is interposed. The upper half of the cooling holder 7 is vertically provided with a cooling water passage 9 that closes at the top, and the cooling water passage 9 is formed from the upper part of the holder 7 in the axial direction of the middle part, and the upper part 9a of the passage 9 has a small diameter. The middle part or lower part 9b has a large diameter, and the upper part 9a is connected to a cooling water inlet 10 provided in a direction perpendicular to the upper part 9a.
It is connected to a cooling water outlet 11 provided in the same manner as in b, and the inlet 10 and outlet 11 are connected to a cooling water introduction passage 12 and a cooling water discharge passage 13 provided in the upper mold 3.

A mounting hole 14 is vertically provided in the lower half of the holder 7 below the cooling water passage 9 in the axial direction. The mounting hole 14 has an upper half 14a with a small diameter and a lower half 14b with a large diameter, a female threaded part 15 formed in the middle or lower part of the upper half 14a, and a large diameter lower half at the lower end of the female threaded part 15. Part 14b
A stepped shoulder portion 14c is formed between the mounting hole 14 and the cooling water passage 9. A cooling water distribution pipe 16 is installed vertically in the cooling water passage 9, and the upper end 16a of the pipe 16 is tightly fitted into the upper part 9a to communicate the inside of the pipe with the cooling water inlet 10. The pipe 16 is loosely connected at the middle or lower part 9b and extends below the mold matching surface 3 of the upper mold 3 through the center of the mounting hole 14. and pipe 1
The lower end 16b of 6 is cut diagonally and opened.

Numeral 17 denotes a casting pin, and the casting pin 17 has a mold mating surface 3
The base portion 19 is made up of a lower half portion 19b which fits into the large diameter lower half portion 14b of the mounting hole 14 and an upper half small diameter portion 19b which fits into the large diameter lower half portion 14b of the mounting hole 14.
The pin 17 is made up of an upper half 19a which fits into the base 19a and a lower half of the upper half 19a which is formed with a male screw portion 20 which screws into the female screw portion 15 of the mounting hole 14. A hexagonal portion 21 for gripping a tool is formed on the upper portion of the pin portion 18 of the pin 17 and is inserted into the base 19 from below the mounting hole 14.
The threaded portions 15 and 20 are screwed together to form the holder 7
The pin 18 is screwed to the underside of the mounting hole 14 so as to protrude downward. In this case, the shoulder 19c of the base 19 of the pin 17 abuts against the shoulder 14c of the mounting hole 14 to be positioned.
A sealant 22 is attached to the upper periphery of the base 19 .

A cooling water passage 23 in the form of a blind hole with a closed bottom is formed in the above-mentioned cast pin 17, and the pipe 16 described above is inserted through the passage 23.
6, and a gap is provided between the outer circumference of the pipe and the inner circumference of the passage.

FIG. 1 shows a state in which the mold can be closed and cast, with the cavity 5 filled with molten metal and the pin part 1 of the casting pin 17
A casting hole is formed by 8, while the cooling water passes through the introduction passage 12 and the inlet 10 to the upper part 9 of the cooling water passage 9.
a, passes through the inside of the pipe 16, reaches the bottom 18a of the pin portion 18 of the cast pin 17, and reaches the bottom 23a of the passage 23.
The cooling water is ejected upward and rises through the gap between the passage 23 in the pin 17 and the outer periphery of the pipe 16, cooling the pin 17 in this process, and further cooling the lower to middle part of the passage 9 in the holder 7. It is discharged from the outlet 11 into the discharge passage 13 through the outlet 9b.

In the above, when replacing the casting pin 17, the upper mold 3 and the lower mold 4 are opened and closed.
The pin part 18 will be exposed on the lower surface, and the cast pin 17 can be removed from the holder 7 by grasping the hexagonal part 21 formed on the upper part of the pin part 18 with a tool and rotating it in the direction of loosening the screw. The holder 7 and the cooling water pipe 16 remain on the upper mold 3 side. This is shown in Figure 3. Subsequently, a new cast pipe is inserted into the mounting hole 14 and screwed together.

(Effect of the invention) As is clear from the above, according to the invention, the casting pin is removably fitted and screwed into the holder on the mold side from the mold matching surface side, and the tool is attached to the exposed part on the mold matching surface side. Since a hexagonal part is provided for gripping, the casting pin can be attached and removed by screwing it while the mold is open, making replacement of the casting pin simple and easy, and the work time is extremely short. In addition to being replaceable, the casting pin is connected to the holder by pilot fitting and threaded connection, which provides sufficient mounting strength and is advantageous in terms of resistance to mold release.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a longitudinal sectional view of the cast pin part, and Fig. 2 is a longitudinal sectional view of the cast pin part.
A line sectional view, FIG. 3 is a diagram with the cast pin removed, and FIG. 4 is a diagram of a conventional example. In the drawing, 3 is a mold, 7 is a holder, 9 is a cooling water passage, 10 and 11 are inlets and outlets, 14 is a hole, and 17
1 is a cast pin, and 15 and 20 are threaded parts.

Claims (1)

[Scope of utility model registration request] In a casting pin device for a casting mold in which a casting pin can be freely attached to a cooling holder equipped with a cooling water passage communicating with a cooling water inlet and an inlet, one end of the cooling holder faces a mold matching surface, and In addition to providing the cooling holder with a large diameter hole that opens to the mold matching surface,
A female threaded portion having a smaller diameter than the large diameter hole is provided inside the mold and communicates with the large diameter hole, while a male threaded portion is screwed into the female threaded portion of the cast pin;
A large diameter part that fits into the large diameter hole is provided so that it can be mounted from the mold matching surface side of the mold, and a hexagonal part is provided in the exposed part to the mold matching surface side adjacent to this large diameter part. Features: Casting mold pin device.