JP2001150448A - Cooling pipe device of core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform maintenance without separating a cooling pipe and a core pin. SOLUTION: In a mold apparatus wherein a cooling pipe is arranged inside a core and a cooling plate having the hole, which communicates with the cooling pipe, formed thereon is provided, the cooling pipe device of the core is constituted so that the cooling pipe is fixed to the core and the lower part of the coiling pipe is loosely fitted to the cooling plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus provided with a cooling plate in which a cooling pipe is disposed inside a core and a hole communicating with the cooling pipe is formed.

[0002]

2. Description of the Related Art An example will be described with reference to FIG. Inside the cavity 101, a core pin 102 for forming a hollow portion in a molded product is arranged. The core pin 10
2, a hollow portion 103 is formed, and the hollow portion 103 is formed.
3 is a cooling pipe 10 for cooling the core pin 102.
4 are arranged. A cooling plate 105 is disposed below the cavity 101, and the cooling plate 105 has two holes. One is a supply hole 107 communicating with the inner hole 106 of the cooling pipe 104, and the supply hole 107 is provided in the cooling pipe 1.
04 is fixed by screwing. The other is a discharge hole 110 communicating with a gap 109 formed between the hollow portion 103 of the core pin 102 and the outer wall of the cooling pipe 104.

Next, the operation will be described. Supply hole 107
From the cooling pipe 104 passes through the inner hole 106 of the cooling pipe 104 and protrudes from the tip of the cooling pipe 104. Then, the protruding cooling water is guided to the discharge hole 110 through the gap 109. Thus, fresh cooling water is constantly circulating in the inner hole 106 of the core pin 102.

[0004]

As the cooling water,
It is common to use water. Therefore, the gap 109, the cooling pipe 104 and the cooling plate 10
As a result, rust was generated at the screwed portion with No. 5, and as a result, the cooling pipe 104 was firmly fixed to the inner surface of the core pin 102 and the screwed portion. Here, when the maintenance of the core pin and the cooling pipe is performed, the core pin, the cooling pin, the cavity, the cooling plate, and the like must be separated. However, the cavity could be separated, but it could not be easily disassembled because the cooling pin was firmly fixed to the core pin and the cooling plate. Needless to say, the fixation is caused by the generation of the rust. If the cooling pin is forcibly separated from the core pin, the cooling pin may break from a threaded portion which is a joint between the cooling pin and the cooling plate before the cooling pin comes out of the core pin. As a result, the screw portion of the cooling pin remains in the cooling plate, and a new screw must be formed. In some cases, the cooling plate becomes useless.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a cooling plate in which a cooling pipe is arranged inside a core and a hole communicating with the cooling pipe is formed. In the mold apparatus, the cooling pipe is fixed to a core, and a lower portion of the cooling pipe is loosely fitted to the cooling plate.

[0006]

A gap is formed between the inner wall surface of the hole of the cooling plate into which the cooling pipe enters, and the lower outer peripheral surface of the cooling pipe. Therefore, even if rust occurs, the cooling pipe and the cooling plate are not fixed by the rust.

[0007]

1 to 3 show a first embodiment of the present invention. Inside the cavity 1, a core pin 2 for forming a hollow portion in a molded product is arranged. A hollow portion 3 is formed in the core pin 2, and a cooling pipe 4 for cooling the core pin 2 is disposed in the hollow portion 3. The outlet 4a of the cooling pipe 4 is cut obliquely. This prevents the discharge of the cooling water when the tip of the cooling pipe 4 is inserted until it contacts the top of the hollow portion 3 of the core pin 2. That is, even if the discharge port is brought into contact with the top of the hollow part, the water is cut diagonally, so that the cooling water can be discharged from the diagonal part. In addition, the cavity 1
A cooling plate 7 is arranged below the cooling plate 7 via an ejector plate 5 and a core plate 6, and the cooling plate 7 is formed with two holes. One is a supply hole 9 communicating with the inner hole 8 of the cooling pipe 4, and the other is a discharge hole 11 communicating with a gap 10 formed between the hollow portion 3 of the core pin 2 and the outer wall of the cooling pipe 4.

The cooling pipe 4 is press-fitted and fixed to the core pin 2 via a bush 12. The bush 12
A slit 13 communicating with the discharge hole 11 is formed at an upper position. The bush 12
The lower end portion passes through the discharge hole 11 and is loosely fitted into a positioning hole 14 formed in the discharge hole 11. Reference numeral 15 denotes a rubber-shaped O-ring for preventing leakage of cooling water from the discharge hole 11 into the mold. Reference numeral 16 denotes an O-ring for preventing leakage of cooling water from the supply hole 9 to the discharge hole 11. However, if the O-ring 16 has high dimensional accuracy and the lower end of the bush is in close contact with the lower end of the discharge hole (see FIG. 3), it is not always necessary, and the dimensional accuracy is such that it leaks somewhat. May be.

A concave portion 17 is formed on the outer peripheral surface of the intermediate portion of the bush 12 to improve the communication between the slit 13 and the discharge hole 11. That is, the cooling water is discharged from the recess 17 to the discharge hole 11 regardless of the direction in which the slit 13 is positioned with respect to the discharge hole 11. In this embodiment, a cut bush is inserted into a commercially available pipe in order to reduce the processing cost. However, the pipe and the bush may be integrally formed by cutting. Separation of the cooling pipe and the bush can be prevented, and the cooling pipe can be pulled out without staying in the core pin even during maintenance. FIG. 4 shows an example of a structure for preventing the cooling pipe and the bush from separating from each other. More specifically, a bulging portion 18 is formed at the lower end of the cooling pipe 4 by pressing or the like. This bulge 18
Abuts against the lower end of the bush 12 to prevent the bush 12 from being detached when being pulled out. Next, the operation will be described. The cooling water passes from the supply hole 9 through the inner hole 8 of the cooling pipe 4 and is discharged from the tip. Then, the discharged cooling water passes through the gap 10, passes through the slit 13 of the bush 12, and is discharged from the discharge hole 11.

FIG. 5 shows a second embodiment of the present invention. The O-ring 16 of the first embodiment is pressed into the positioning hole 14.
This is a fixed example. More specifically, the positioning hole 1
A step 19 is formed at a position where the bottom of the bush 12 contacts the O-ring 16. By fixing the O-ring 16 to the step portion 19 in advance, the O-ring 16 may be inclined when assembling the bush or the like, or the O-ring may fall down when the mold is set horizontally. There is no such thing as.

FIG. 6 shows a third embodiment of the present invention.
Instead of 9, a recess 20 may be formed on the inner surface of the lower end of the bush 12, and the O-ring 16 may be pressed into and fixed to the recess 20. As compared with the second embodiment, the O-ring 16 can be fixed in a shallow concave portion, and the fixing work is easy.

FIG. 7 shows a fourth embodiment of the present invention, which is a modification of the bush. In this embodiment, the outer diameter of the bush 21 is made smaller than that of the bush 12 of the previous example, and one side of the slit 22 is formed almost to the lower end. As a result of reducing the outer diameter of the bush 21, the cooling pipe (bush) and the cooling plate can be easily separated from each other even if more rust occurs than in the previous example.

FIG. 8 shows a fifth embodiment of the present invention, which may be formed as a discharge hole. More specifically, a hole 24 having a diameter larger than the outer diameter of the cooling pipe 4 is formed in the upper part of the bush 23.
Is formed. A lateral hole 25 is formed at a position facing the intermediate portion. Moreover, this horizontal hole 25
Is formed at a position coaxial with the discharge hole 11. That is, the cooling water is supplied to the cooling pipe 4 and the hole 24 of the bush 23.
And then passes through the horizontal hole 25 and is guided to the discharge hole 11.

FIG. 9 shows a sixth embodiment of the present invention. It is a modification of the fixing structure of the bush to the core pin. A female screw 26 is formed on the core pin 2 in the present embodiment, and a male screw 27 of the bush 12 is screwed to the female screw (in the examples shown in FIGS. 9 and 10, a taper pipe thread having a large fixing force). However, the present invention is not limited to this, and a parallel screw may be used.) By relatively rotating the core pin and the bush, attachment and detachment can be easily performed.

FIG. 10 shows a seventh embodiment of the present invention. If a hexagonal portion 28 or a plus groove (or minus groove) is formed on the inner or outer surface of the bush 12, various general tools can be used. And the above operation becomes easier.
In the above example, for example, a cooling pipe device of a core pin for forming a long-axis object such as a writing instrument has been described. It may be a cooling pipe device for the core, or a cooling pipe device for the core used when forming a boss having an inner hole.

[0016]

According to the present invention, there is provided a mold apparatus provided with a cooling plate in which a cooling pipe is disposed inside a core and a hole communicating with the cooling pipe is formed. Since the cooling pipe is fixed and the lower part of the cooling pipe is loosely fitted to the cooling plate, the cooling pipe and the cooling plate can be easily separated from each other, so that maintenance is also easy.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a first embodiment of the present invention.

FIG. 2 is an external perspective view of the bush of FIG.

FIG. 3 is a front sectional view of a lower part of a cooling pipe and a bush of FIG. 1;

FIG. 4 is an enlarged front sectional view of a state in which a bush is fitted to the cooling pipe of FIG. 3;

FIG. 5 is a front sectional view of a lower part of a cooling pipe and a bush according to a second embodiment of the present invention.

FIG. 6 is a front sectional view showing a third embodiment of the present invention, in which a recess is formed on the inner surface of the lower end of the bush of FIG. 5;

FIG. 7 is a front sectional view of a lower part of a cooling pipe and a bush according to a fourth embodiment of the present invention.

FIG. 8 is a front sectional view of a lower part of a cooling pipe and a bush according to a fifth embodiment of the present invention.

FIG. 9 is a front sectional view of a lower part of a cooling pipe and a bush according to a sixth embodiment of the present invention.

FIG. 10 is a front sectional view of a lower part of a cooling pipe and a bush according to a seventh embodiment of the present invention.

FIG. 11 is a front sectional view of a conventional device.

[Explanation of symbols]

 Reference Signs List 1 cavity 2 core pin 3 hollow portion 4 cooling pipe 5 ejector plate 6 core plate 7 cooling plate 8 inner hole of cooling pipe 9 supply hole 10 gap 11 discharge hole 12 bush 13 slit 14 positioning hole 15, 16 o-ring 17 recess 18 expansion Protrusion 19 Step 20 Recess

Claims (2)

[Claims] 1. A mold apparatus having a cooling plate in which a cooling pipe is disposed inside a core and having a hole communicating with the cooling pipe, wherein the cooling pipe is fixed to the core. A cooling pipe device for a core, wherein a lower portion of the cooling pipe is loosely fitted to the cooling plate. 2. The core cooling pipe device according to claim 1, wherein a loose fitting distance of the cooling pipe to the cooling plate is shorter than a projecting distance from the cooling plate. Cooling pipe equipment.