JP2004351861A - Cooling device for dies - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve simplification, miniaturization and weight saving of a structure of a cooling device for a die, to achieve narrowness of its arrangement space and to make the cooling device applicable to a cooling hole having a smaller diameter. <P>SOLUTION: One end portion of an outer pipe 1 is screwed to a screwing portion 3c1 of a connecting hole 3c, and a flange portion 2b of an inner pipe 2 is clamped from both sides in the axial direction by a side wall of a mating portion 3c3 and one end of the outer pipe 1. Cooling water supplied to a water supply opening 3a is supplied to an inner space of a core pin through a passage of the water supply opening 3a→a connecting passage 3d → one end opening of the inner pipe 2 → the inner passage 2a of the inner pipe 2 → another end opening of the inner pipe 2. The cooling water is drained through a passage of the inner space of the core pin → a clearance passage 5 between the outer circumference of the inner pipe 2 and the inner circumference of the outer pipe 1 → a through-hole 1c of the outer pipe 1 → a liquid chamber portion 3c2 → a drain hole 3b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mold cooling device used for die casting, injection molding, and the like, and in particular, is configured so that an inner pipe is concentrically arranged on an inner circumference of an outer pipe to form a forward path and a return path of cooling water. The present invention relates to a cooling device for a mold.
[0002]
[Prior art]
2. Description of the Related Art A mold cooling device is used to cool a mold by mounting it in a cooling hole of a mold used for die casting or injection molding. As this cooling device, the inner pipe is arranged concentrically on the inner circumference of the outer pipe, and the inner passage of the inner pipe is formed at the distal end side into the gap passage between the outer circumference of the inner pipe and the inner circumference of the outer pipe. A configuration is known in which the communication path forms a forward path and a return path of the cooling water, and a connection head for connecting a hose connected to the forward path and the return path is mounted on the base end side of the inner pipe and the outer pipe.
[0003]
Conventionally, in this type of mold cooling device, scales and the like adhere to the outward path and the return path due to the fact that the outer pipe and the inner pipe are fixedly and integrally fixed to the connection head for connecting the hose. Therefore, even if the flow of cooling water is hindered or one of the pipes is broken, the entire pipe must be replaced, causing a problem such as economic disadvantage.
[0004]
In order to cope with such a problem, for example, Japanese Patent Application Laid-Open No. H11-163,086 discloses a hose connection base (connection head) having a water inlet communicating with an outward path and a water outlet communicating with a return path. The chamber and the water outlet communicating with the water outlet are formed in parallel on the axis of the outer pipe, and the holding pipe is inserted and removed in the water inlet, and one end of the outer pipe is screwed and connected to the water outlet. A configuration is disclosed in which one end of an inner pipe penetrates a water discharge chamber and is connected to a holding pipe.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 6-14926
Further, according to Patent Document 1, a locking flange is integrally attached to one end of the inner pipe, and the locking flange is sandwiched between a packing installed on a partition wall between the water inlet chamber and the water discharge chamber and an end face of the holding pipe. By doing so, there is also disclosed a configuration in which the inner pipe is connected to the holding pipe.
[0007]
According to such a configuration, the outer pipe, the inner pipe, and the holding pipe can be individually disassembled from the hose connection mouthpiece, and it can be expected that the above-described problem will be solved.
[0008]
[Problems to be solved by the invention]
However, the cooling device described in Patent Literature 1 has a hose connection base in which a total of two volume chambers, a water inlet chamber and a water outlet chamber, are formed in parallel along the axial direction of the outer pipe. The connection base becomes long in the axial direction, which causes a problem that the size and weight of the cooling device are increased and the space for disposing the hose connection base is enlarged.
[0009]
Specifically, in this cooling device, since the holding pipe is housed in the water inlet chamber, in order to improve the flow of the cooling water, the flow passage area of the internal passage of the holding pipe is made larger than the internal passage of the inner pipe. After that, it is necessary to secure a flow path length corresponding to the axial length of the holding pipe, and as a result, it is necessary to make the volume of the water inlet chamber a predetermined size. In addition, since it is necessary to cut off the flow of the cooling water between the water inlet chamber and the water outlet chamber, it is necessary to form a partition wall having a predetermined thickness between the two chambers. Due to these factors, the axial length of the hose connection base is inevitably increased.
[0010]
Also, as a means for making the inner pipe detachable as described above, the holding pipe is housed in the water inlet chamber, so that the passage configuration from the water inlet to the inner passage of the inner pipe becomes complicated, and There is a possibility that the flow of cooling water may be impaired at the inlet side of the cooling water.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to provide a mold cooling device that can be applied to a cooling hole having a smaller diameter while simplifying the structure, reducing the size and weight of the cooling device for a mold, and reducing the installation space. To provide.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an inner pipe which is arranged concentrically on an inner circumference of an outer pipe, an inner passage of the inner pipe is used as a forward path of cooling water, and a gap passage between the two pipes is provided. A cooling water return path, and a connection head to which one end of each of the pipes is attached, a water supply port communicating with the outward path, and a drain port communicating with the return path, a mold cooling device comprising: The head has a connection hole to which one end of each of the two pipes is connected, and a communication path for communicating the connection hole with a water supply port, and the connection hole is screwed to one end of the outer pipe. A threaded portion, a liquid chamber portion communicating with the discharge port, and a fitting portion into which a flange portion provided on the outer periphery of one end of the inner pipe is removably fitted. The part has a through-hole in a part arranged in the liquid chamber part, and An end is inserted into the connection hole, the flange is fitted into the fitting portion, and one end of the outer pipe is screwed into the screwing portion, and the flange is fitted into the fitting portion. Between the side wall of the outer pipe and one end of the outer pipe, the cooling water supplied from the water supply port flows into the outward path from the one end opening of the inner pipe through the communication path, and the cooling water from the return path is A cooling device for a mold, wherein the cooling device is caused to flow out to the drain port through a through hole of an outer pipe and the liquid chamber.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0014]
FIG. 1 shows a mold cooling device according to an embodiment of the present invention. The inner pipe 2 is arranged concentrically on the inner circumference of the outer pipe 1, and one ends of the outer pipe 1 and the inner pipe 2 are connected to the connection head 3. The other ends of the outer pipe 1 and the inner pipe 2 are inserted into core pins (not shown) of the mold, and are sealed by an O-ring 4 mounted on the outer periphery of the other end of the outer pipe 1. The other end openings of the outer pipe 1 and the inner pipe 2 are located in the inner space of the core pin, and the inner passage 2 a of the inner pipe 2 is used for the outward passage of the cooling water, the outer circumference of the inner pipe 2 and the inner circumference of the outer pipe 1. The gap passage 5 between them becomes the return path of the cooling water. The outer pipe 1 and the inner pipe 2 are smaller in diameter than conventional ones. For example, the outer pipe 1 has an outer diameter of 4 mm and an inner diameter of 2 mm, and the inner pipe 2 has an outer diameter of 1 mm and an inner diameter of 0.7 mm.
[0015]
The connection head 3 includes a water supply port 3a, a drain port 3b, a connection hole 3c to which one end of the outer pipe 1 and the inner pipe 2 are connected, and a communication path 3d for communicating the connection hole 3c with the water supply port 3a. Have. The diameter of the communication passage 3 d is substantially equal to the inner diameter of the inner pipe 2.
[0016]
The water supply port 3a has a threaded portion 3a1 for connecting a water supply pipe, and communicates with the center of the connection hole 3c in the axial direction via a communication passage 3d. The drain port 3b has a threaded portion 3b1 for connecting a drain pipe, and communicates radially with the liquid chamber 3c2 of the connection hole 3c.
[0017]
The connection hole 3c is formed by inserting and removing a screw portion 3c1 to which one end of the outer pipe 1 is screw-connected, a liquid chamber portion 3c2 communicating with the discharge port 3b, and a flange portion 2b provided on the outer periphery of one end of the inner pipe 2. And a fitting portion 3c3 to be fitted.
The screw portion 3c1 is located at the other end of the connection hole 3c, the fitting portion 3c3 is located at one end of the connection hole 3c, and the liquid chamber portion 3c2 is located between the screw portion 3c1 and the fitting portion 3c3. I do.
[0018]
One end of the outer pipe 1 has a threaded portion 1a connected to the threaded portion 3c1 of the connection hole 3c, and at one end side of the threaded portion 1a, a small diameter portion 1b slightly smaller in diameter than other portions. have. The small diameter portion 1b is disposed in the liquid chamber 3c2 of the connection hole 3c, and the outer peripheral side of the small diameter portion 1b is an annular space. Further, one or a plurality of through holes (radial holes) 1c are formed in the small diameter portion 1b. In this embodiment, four through holes 1c are formed at 90 degree intervals.
[0019]
In assembling, one end of the inner pipe 2 is inserted into the connection hole 3c, and the flange 2b on the outer periphery of one end is fitted into the fitting portion 3c3 of the connection hole 3c. Then, one end of the outer pipe 1 is inserted into the connection hole 3c, the screwed portion 1a is screwed into the screwed portion 3c1 of the connection hole 3c, and the flange 2b of the inner pipe 2 is connected to the side wall of the fitting portion 3c3. One end of the outer pipe 1 is sandwiched from both sides in the axial direction. Thereby, the outer pipe 1 and the inner pipe 2 are detachably mounted on the connection head 3.
[0020]
In the above configuration, the cooling water supplied to the water supply port 3a is supplied to the core through a path of the water supply port 3a → the communication passage 3d → the one end opening of the inner pipe 2 → the inner passage 2a of the inner pipe 2 → the other end opening of the inner pipe 2. Water is supplied to the internal space of the pin, and the internal space of the core pin → the gap passage 5 between the outer circumference of the inner pipe 2 and the inner circumference of the outer pipe 1 → the through hole 1c of the outer pipe 1 → the liquid chamber 3c2 → The water is drained through the drain outlet 3b.
[0021]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the simplification of a structure in this kind of mold | die cooling apparatus, reduction in size and weight, and narrowing of the installation space can be achieved, and the mold | die which can be applied also to a cooling hole of a smaller diameter. Cooling device can be provided.
[Brief description of the drawings]
FIG. 1 is a sectional view of a mold cooling device according to an embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 1 outer pipe 1c through hole 2 inner pipe 2a inner passage 2b flange 3 connection head 3a water supply port 3b drain port 3c connection hole 3c1 screwing section 3c2 liquid chamber 3c3 fitting section 3d communication path

Claims (1)

An inner pipe is arranged concentrically on the inner circumference of the outer pipe, an internal passage of the inner pipe is used as a forward path of the cooling water, and a gap path between the two pipes is used as a return path of the cooling water. In a cooling device for a mold, a connection head to which one end of a pipe is attached is provided with a water supply port communicating with the outward path and a drain port communicating with the return path.
The connection head has a connection hole to which one end of each of the two pipes is connected, and a communication path for communicating the connection hole with a water supply port,
The connection hole has a threaded portion to which one end of the outer pipe is threadedly connected, a liquid chamber communicating with the discharge port, and a flange provided on the outer periphery of one end of the inner pipe so as to be removably fitted. And a fitting portion to be combined,
One end of the outer pipe has a through hole in a portion arranged in the liquid chamber,
Inserting one end of the inner pipe into the connection hole, fitting the flange to the fitting part, and screwing one end of the outer pipe to the screwing part, Sandwiched between the side wall of the fitting portion and one end of the outer pipe,
The cooling water supplied from the water supply port is caused to flow into the outward path from one end opening of the inner pipe through the communication path, and the cooling water from the return path is passed through the through hole of the outer pipe and the liquid chamber portion. A cooling device for a mold, wherein the cooling device flows out to the drain port.

Images