JP2000141010A - Cooling tube for die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce clogging of one side opening of an inner tube by coaxially arranging an inner tube inside an outer tube, forming outward and inward passages of cooling water and mounting, to one end side of the outer tube, an outgoing water connection port communicating to the inside of the outward passage and an incoming water connection port communicating to the inside of the inward passage so as to reduce the number of parts and working man- hours. SOLUTION: A cooling water outward passage 3 and a cooling water inward passage 5 are formed by coaxially inserting an inner tube 2 inside an outer tube 1, an outgoing water connection port 6 communicating to the inside of the outer tube 1 for the cooling inward passage 5 and an incoming water connection port 4 communicating to the inside of the cooling water inward passage 3 for the cooling water outward passage 3 are directly mounted to one end side of the outer tube, one end side opening 1a of the outer tube is plugged by a water stop plug 9. By this method, a hose connection fitting is not required, a foreign matter entered a water stop cap 10 is not accumlated therein. Further, the outer tube 1 is formed by an extruding material or drawing material, a production cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling pipe for a die for cooling a die by mounting it in a cooling hole of a die used for die casting or injection molding, and more particularly to a cooling pipe for an outer pipe. The present invention relates to a mold cooling pipe in which an inner pipe is disposed concentrically to form a forward path and a return path of cooling water.

[0002]

2. Description of the Related Art In a conventional cooling pipe for a mold, as shown in FIG. 3, a hose connection base c is attached to one end of an outer pipe a and an inner pipe b.
A water inlet port e leading to the cooling water outward path d and a water outlet port g leading to the cooling water return path f. When attaching the hose connection base c to one end side of the outer pipe a and the inner pipe b, there are a method by screwing and a method by welding as shown in FIG. 3, but both methods require processing and man-hours for connection. As a result, the manufacturing cost is increased accordingly, and water leakage may occur or break from the connection portion. In addition, the latter method using welding has a problem that the appearance of the welded portion is poor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to reduce the number of parts and the number of processing steps, to reduce the manufacturing cost, and to reduce the cost of one end of the inner pipe. An object of the present invention is to provide a cooling pipe for a mold in which clogging of a side opening (water inlet) hardly occurs.

[0004]

According to the present invention, there is provided a mold cooling pipe in which an inner pipe is concentrically arranged in an outer pipe to form a forward path and a return path of cooling water. A water outlet connecting to the inside of the outer pipe, which serves as a return path for cooling water, and an inlet connecting port, which connects to the inside of the inner pipe, serving as a forward path for cooling water, at one end of the outer pipe. Things. At this time, it is preferable that the outer pipe is formed of an extruded material or a drawn material. Further, an opening on one end side of the inner pipe is sealed with a water stop cap having an inflow opening, and an engagement step formed by forming the water stop cap on the inner circumference of the outer pipe and an opening on one end side of the outer pipe are formed. It is preferable to arrange the inner pipe concentrically in the outer pipe by sandwiching the inner pipe with a water stopcock to be sealed.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. However, the present invention is not limited to the illustrated embodiments.

[0006] The mold cooling pipe A according to the present invention basically comprises an outer pipe 1 and an inner pipe 2 which are disposed concentrically.
Directly attached to one end of the outer pipe 1 for the outward path 3 of cooling water
And a water discharge connection port 6 communicating with the return path 5 of the cooling water, and are removably inserted and mounted in a cooling hole 7 drilled from the back side of the mold B toward the cavity, It is fixed by a pressing plate 8 provided on the back side of the mold B as necessary so that it does not come out of the cooling hole 7 carelessly.

Usually, in this type of mold cooling pipe A, the inner pipe 2 is formed as shown in the illustrated embodiment in consideration of the efficient flow (behavior) of cooling water in the cooling hole 7 of the mold B. The inner pipe 2 is formed to be slightly longer than the outer pipe 1 so that the inside of the inner pipe 2 serves as a forward path 3 of the cooling water, and the space between the outer pipe 1 and the inner pipe 2 serves as a returning path 5 of the cooling water.

The outer pipe 1 is made of a hollow metal material having a required length and has a cross-sectional outer shape formed in a substantially circular shape or a polygonal shape such as a hexagon. At this time, the desired outer shape may be formed by cutting or the like using a hollow pipe material. However, the outer shape is previously formed into the required outer shape and the inside thereof is formed in a hollow shape along the longitudinal direction. It is preferable to use an extruded or drawn material.

Then, the inner pipe 2 is inserted and disposed concentrically inside the outer pipe 1 to form the outward path 3 and the return path 5 of the cooling water.
The water connection port 6 communicating with the inside of the outer pipe 1 and the water connection port 4 communicating with the inside of the inner pipe 2 forming the outgoing path 3 of the cooling water are directly attached, and one end side opening 1 a is sealed with a water stopcock 9. . That is, two screw holes 1b and 1c are formed at one end of the outer pipe 1 in a direction perpendicular to the axial direction so as to penetrate therein, and the water inlet port 4 is inserted into one screw hole 1b and the other screw hole. The water outlet connection port 6 is screw-fitted to 1c, and one end side opening 1a is sealed in a watertight manner with a water stopcock 9.

The inner pipe 2 is formed to be slightly longer than the outer pipe 1 by using, for example, a copper pipe material having a smaller diameter than the inner diameter of the outer pipe 1, and one or more openings 2a on one end thereof are formed on the outer circumference. The water inlet 10a is sealed with a water blocking cap 10 having an opening, and is inserted and disposed concentrically inside the outer pipe 1. At this time, the outer diameter of the water stop cap 10 is made slightly larger than the outer diameter of the inner pipe 2, and the screw hole 1 b for mounting the water inlet connection port 4 and the screw hole 1 for mounting the water outlet connection port 6 are formed.
c, an engaging step 11 is formed, and the front and rear of the water stop cap 10 is sandwiched between the engaging step 11 and the water stopcock 9 for sealing the one end side opening 1a of the outer pipe 1.

In order to assemble the mold cooling pipe A, the one end opening 2a of the inner pipe 2 must be
a is sealed with a water stop cap 10 having an opening formed therein,
The inner pipe 2 is inserted through an opening on one end side of the outer pipe 1 so that the distal end 10b of the water stop cap 10 abuts on an engaging step 11 formed on the inner periphery of the outer pipe 1.
The water inlet port 4 and the water outlet port 6 are screwed to one end of the outer pipe 1 respectively, and then a water stopcock 9 is screwed into one end of the outer pipe 1 and tightened. And seal it.

Then, the water stop cap 10 of the inner pipe 2 is connected to the water stop plug 9 and the engagement step 11 formed on the inner circumference of the outer pipe 1.
And the inner pipe 2 is fixed in the outer pipe 1 and concentric with the outer pipe 1, and the water inlet connection port 4 is connected to the inner pipe through the inlet 10 a of the water stop cap 10. 2 communicates with the cooling water outward path 3 inside the
Communicates with the cooling water return path 5 between the outer pipe 1 and the inner pipe 2.

Then, the mold cooling pipe A is replaced with the mold B
When the cooling pipe 7 is installed in the cooling hole 7, the other end 1 of the outer pipe 1
(d) A ring-shaped packing is mounted on the outer periphery and pushed into the cooling hole 7 of the mold B and mounted, or a male screw 1e is engraved on the outer periphery 1d on the other end side of the outer pipe 1 as shown in the illustrated embodiment. , And finally, hoses are respectively connected to the inlet connection port 4 and the outlet connection port 6. still,
When the outer pipe 1 is screwed into the cooling hole 7 of the mold B, the outer pipe 1 is formed in a hexagonal shape so that the outer pipe 1 can be easily screwed in with a tool such as a wrench. Is preferably formed in a polygonal shape.

Thus, the cooling water supplied from the water inlet 4 through the hose (not shown) is
The heat is exchanged in the cooling hole 7 of the mold B by passing through the inside of the inner pipe 2, that is, the cooling water outward path 3 through the inflow port 10 a of the mold B, and removes the heat of the mold. Then, the cooling water that has undergone heat exchange in the cooling hole 7 of the mold B passes through the cooling water return path 5 formed between the outer pipe 1 and the inner pipe 2 and is discharged to the outside through the water outlet connection port 6.

[0015]

According to the cooling pipe for a mold according to the present invention, the inner pipe is disposed concentrically in the outer pipe to form the outward path and the return path of the cooling water. In addition, a water outlet connecting to the inside of the outer pipe, which is the return path for cooling water, and a water inlet connecting to the inside of the inner pipe, which is the outward path of cooling water, are attached, so that the number of parts and the number of processing steps are reduced. It is possible to reduce the manufacturing cost and to easily replace a damaged part.

Further, according to the cooling pipe for a mold according to the second aspect of the present invention, since the outer pipe is formed of an extruded material or a drawn material, the outer shape of the outer pipe is formed in a polygonal shape such as a hexagon. Even in this case, it is possible to further reduce the manufacturing cost.

Further, according to the cooling pipe for a mold according to the third aspect of the present invention, one end opening of the inner pipe is sealed with a water stop cap having an inflow opening, and the water stop cap is connected to the outer pipe. Because it was configured to be sandwiched between the engaging step formed on the inner periphery of the outer pipe and the water stopcock that seals the opening at one end of the outer pipe,
It is easy to assemble and manufacture, and there is no possibility that dust entering the water stop cap accumulates in the water stop cap, so that clogging of one end side opening (water inlet) of the inner pipe is less likely to occur.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state in which a mold is mounted on a cooling hole according to an embodiment of the present invention.

FIG. 2 is an exploded sectional view showing one embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

A: Cooling pipe for mold B: Mold 1: Outer pipe 2: Inner pipe 1a: Opening on one end side of outer pipe 2a: Opening on one end side of inner pipe 3: Cooling water outward path 4: Water inlet connection port 5: Cooling water return path 6: Outlet connection port 7: Cooling hole 8: Holding plate 9: Water stopcock 10: Water stop cap 11: Engagement step 10a: Inlet

Claims (3)

[Claims] An inner pipe is concentrically arranged in an outer pipe to form a forward path and a return path of cooling water. One end of the outer pipe is provided inside the outer pipe serving as a return path of cooling water. A cooling pipe for a mold, comprising: a water outlet connecting therethrough, and a water inlet connecting to the inside of the inner pipe serving as a forward path of cooling water. 2. The cooling pipe for a mold according to claim 1, wherein the outer pipe is formed of an extruded material or a drawn material. 3. An engagement step formed by sealing an opening on one end side of the inner pipe with a water stop cap having an inflow opening, and forming the water stop cap on an inner periphery of the outer pipe, and the outer pipe. 2. The mold cooling pipe according to claim 1, wherein said cooling pipe is sandwiched by a water stopcock for sealing one end side opening of said mold.