JP2002096331A - Cooling device for mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a connecting head small-sized and lightweight by reducing the number of volume chambers formed in the connecting head and at the same time, eliminate economic disadvantages such as the obstruction of circulation of a cooling liquid by the deposition of an incrustation and the like and the replacement of parts due to their partial damage. SOLUTION: In the connecting head 9, a liquid chamber 13 which is connected to a gap passage 7 at the base end side of an outer pipe 2 and has an inner pipe 3 passing through internally, a first piping threaded hole 16 into which one of piping members 14 communicating with the liquid chamber 13, is screwed, an engaging recessed part 19 with which a collar part 18 fixed to the outer periphery of the base end part of the inner pipe 3 is engaged from the base end side in such a manner that the collar part 18 is freely attachable/detachable, a fitting hole 20 into which the inner pipe 3 is fitted in a freely drawable/ insertable manner and a second piping threaded hole 23 into which the other piping member 21 communicating with the inner passage 6 of the inner pipe 3 is screwed and which is connected to the base end side of the engaging recessed part 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold cooling device used for die casting, injection molding, and the like. And a mold cooling device configured to form the above.

[0002]

2. Description of the Related Art Generally, a mold used for die casting or injection molding is provided with a cooling device for cooling the periphery of a cavity. 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 tip 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] This type of mold cooling device has conventionally been constructed in such a manner that an outer pipe and an inner pipe are inseparably fixedly integrated with a connection head for connecting a hose.
Even if scale is attached to the outbound or return path and the flow of cooling water is hindered, or if one of the pipes is damaged, the entire pipe must be replaced, causing problems such as economic disadvantage. Had.

In order to deal with such a problem, for example, according to Japanese Utility Model Publication No. Hei 6-14926, a hose connection base (connection head) having an inlet port communicating with the outward path and an outlet port communicating with the return path, A water inlet chamber communicating with the water inlet and a water outlet chamber communicating with the water outlet are formed in parallel on the axis of the outer pipe, and a holding pipe is inserted into and removed from the water inlet chamber, and one end of the outer pipe is drained. There is disclosed a configuration in which the inner pipe is threadedly connected to the chamber, and one end of the inner pipe penetrates the water discharge chamber and is connected to the holding pipe.

According to the publication, a locking flange is integrally attached to one end of an inner pipe, and a locking flange installed on a partition wall between a water inlet chamber and a water discharge chamber and an end face of a holding pipe are used. A configuration is also disclosed in which the inner pipe is connected to the holding pipe by sandwiching the inner pipe.

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-mentioned problem will be solved.

[0007]

However, in the cooling device disclosed in the above publication, a total of two volume chambers, i.e., a water inlet chamber and a water outlet chamber, are arranged in parallel in the axial direction of the outer pipe. Because it is formed, the hose connection base becomes longer in the axial direction, which leads to an increase in size and weight of the cooling device,
There is a problem that the space for disposing the hose connection base is enlarged.

More specifically, this cooling device requires a water inlet chamber as an essential component. Since the water inlet chamber contains a holding pipe, it is necessary to improve the flow of cooling water. On the other hand, after making the flow passage area of the internal passage of the holding pipe larger than the internal passage of the inner pipe, it is necessary to secure a flow passage length corresponding to the length of the holding tube in the axial direction. In addition, it is necessary to make the volume of the water inlet chamber a predetermined size. Moreover, since it is necessary to block 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 length of the hose connection base in the axial direction is inevitably increased.

Further, since the holding pipe is housed in the water inlet chamber as a means for making the inner pipe detachable, the passage structure from the water inlet to the inner passage of the inner pipe becomes complicated. Therefore, there is a possibility that the flow of the cooling water may be impaired at the entrance side of the outward path.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and reduces the number of volume chambers formed in a connection head for pipe connection, thereby reducing the size and weight of the connection head and the space for disposing the connection head. It is another technical object of the present invention to provide a mold cooling device capable of simplifying a passage configuration from a water supply port (water inlet) to an internal passage of an inner pipe.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above technical object, the present invention provides an inner pipe which is concentrically arranged on the inner periphery of an outer pipe, and uses an inner passage of the inner pipe as an outward passage of a coolant. ,
For a mold having a gap passage between the two pipes as a return path for the coolant, and a connection head to which the base ends of both pipes are attached, provided with a water supply port leading to the outward path and a drain port leading to the return path. In the cooling device, the connection head is fitted with a pipe screw hole into which the base end of the outer pipe is screwed, a liquid chamber communicating with the gap passage and the drain port, and a fitting into which the inner pipe is removably fitted. The hole, the engagement concave portion with which the flange provided on the outer periphery of the base end of the inner pipe engages, and the water supply port are sequentially connected on the axis of the outer pipe, and the inner pipe is fitted from the water supply port. Aperture, liquid chamber,
And while penetrating and inserting the inner circumference of the outer pipe screwed into the pipe screw hole, screwing the pipe member communicating with the outward path to the water supply port, the tip of the pipe member and the end wall surface of the engagement recess Thus, the flange of the inner pipe is sandwiched from both sides.

According to such a configuration, the cooling liquid flowing into the internal passage of the inner pipe from the pipe member screwed into the water supply port of the connection head reaches the predetermined cooling space on the distal end side of the inner pipe. Passes through the gap passage between the two pipes, reaches the liquid chamber, and flows out through the drain port. As described above, since only a single liquid chamber is provided as a volume chamber in the flow path of the coolant, particularly in the flow path in the connection head, the connection head is reduced in size and weight and the arrangement space is reduced. And so on.

Further, since there is no need to provide a volume chamber accommodating the holding pipe in the middle of the flow passage from the water supply port to the internal passage of the inner pipe, the passage configuration at the entrance side of the outward path is simplified. And there are no factors that hinder distribution.

Further, the engagement recess and the water supply port of the connection head are provided so as to be connected to each other, and a pipe member communicating with the outward path is screwed into the water supply port so that the tip of the pipe member and the end of the engagement recess are connected. The flange of the inner pipe is sandwiched between the wall surface and the inner pipe, whereby the inner pipe is fixed to the connection head.
Therefore, it is not necessary to separately provide a member for fixing the inner pipe, and the number of parts can be reduced.

Further, according to the present invention, the inner pipe is arranged concentrically around the inner circumference of the outer pipe, the inner passage of the inner pipe is used as the outward passage of the coolant, and the gap passage between the two pipes is used as the coolant passage. With the return path, the connection head to which the base ends of both pipes are attached, a water supply port leading to the outward path, and a mold cooling device provided with a drain port leading to the return path, in the connection head,
A pipe screw hole into which the base end of the outer pipe is screwed, a liquid chamber communicating with the gap passage and the drain port, and a communication passage communicating the liquid chamber with the water supply port are formed on the axis of the outer pipe. And the base end of the inner pipe and the coil spring are inserted into the liquid chamber from the pipe screw hole, the outer pipe is inserted into the inner pipe, and the base end is screwed into the pipe screw hole. The method is characterized in that the coil spring is pressed at the base end of the outer pipe, and the flange of the inner pipe is pressed against the end wall of the liquid chamber and held by the elastic force of the coil spring.

According to such a configuration, only a single liquid chamber is provided as a volume chamber in the flow path of the coolant in the connection head, so that the connection head is reduced in size and weight and the installation space is reduced. Is achieved. In addition, since the volume chamber accommodating the holding pipe is not formed in the middle of the flow passage from the water supply port to the internal passage of the inner pipe, the passage configuration on the entrance side of the outward path is simplified.

In this case, the liquid chamber not only accommodates a coil spring for pressing the flange portion to fix the inner pipe, but also plays a role of connecting the gap passage to the drain port. Can be effectively unified. And
The coil spring is a member that does not hinder the flowability of the cooling liquid as compared with a tubular body such as a holding pipe, so that even if the coil spring is interposed in the liquid chamber, the smooth flow of the cooling liquid is not hindered. Absent.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a main part of a mold cooling device according to a first embodiment of the present invention. In addition, in the same figure, the front side refers to the right side in the drawing, and the base side refers to the left side in the drawing. Mold cooling device 1
A configuration in which the inner pipe 3 is arranged concentrically on the inner circumference of the outer pipe 2, and the respective distal end openings of the outer pipe 2 and the inner pipe 3 are located in the cooling space 5 of the core pin 4 a of the mold 4. It is said. Therefore, the internal passage 6 of the inner pipe 3 is formed as a gap passage 7 between the outer periphery of the inner pipe 3 and the inner periphery of the outer pipe 2.
To the front end. Then, the internal passage 6 of the inner pipe 3 is configured to be a forward path, and the gap path 7 is configured to be a return path.

In this case, the inner pipe 3 protrudes distally and proximally with respect to the distal end face and the proximal end face of the outer pipe 2 respectively. A seal member made up of one or a plurality of (two in the illustrated example) O-rings 8 is attached to the outer periphery of the distal end portion of the outer pipe 2. Is sealed with the cooling space 5.

As shown in FIG. 2, the base ends of the outer pipe 2 and the inner pipe 3 are mounted on a connection head 9 for connecting a hose, and the connection head 9 is provided on the base end side of the mold 4. The cooling space 5 of the two pipes 2 and 3 comes into contact with the holding plate 10.
Is prevented from coming off. A male screw portion 11 is formed on the outer periphery of the base end portion of the outer pipe 2, and the male screw portion 11 of the outer pipe 2 is screwed into a female screw portion 12 for a pipe formed as a pipe screw hole in the connection head. I have. At the base end side of the outer pipe 2 in the connection head 9, a liquid chamber 13 connected to the female pipe thread 12 is formed, and the inner pipe 3 passes through the liquid chamber 13.

A straight joint 14 as a pipe member communicating with the liquid chamber 13 is attached to the connection head 9, and a male screw portion 15 formed on the straight joint 14 is provided.
Is screwed into a female thread portion 16 for a first pipe as a drain port formed in the connection head 9. In this case, the first pipe female screw portion 16 is formed along a direction orthogonal to the axial direction of the inner pipe 3. A hose 17 is detachably attached to one end of the straight joint 14.

A flange 18 is fixedly integrated with the outer periphery of the base end of the inner pipe 3 so that the internal passage 6 is opened in the base end surface.
A flange portion 18 is engaged with an engagement concave portion 19 formed in the connection head 9 so as to be disengageable from the base end side. A partition wall between the liquid chamber 13 of the connection head 9 and the engagement recess 19 is provided with an inner pipe 3.
A fitting hole 20 is formed in which is fitted so that it can be pulled out and inserted while being sealed by a seal member or the like. Connection head 9
L is a pipe member communicating with the base end of the internal passage 6.
A letter-shaped elbow joint 21 is mounted, and a male screw part 22 formed in the elbow joint 21 is screwed to a female screw part 23 for a second pipe as a water supply port formed in the connection head 9.

In this case, the female pipe thread 12, the liquid chamber 13, the fitting hole 20, the engaging recess 19, and the second female pipe thread 23 are positioned on the axis of the outer pipe 2. While being connected sequentially, the inner pipe 3 is
It is inserted through the fitting hole 20, the liquid chamber 13, and the inner circumference of the outer pipe 2. Then, in a state where the flange portion 18 of the inner pipe 3 is engaged with the engagement concave portion 19, the male screw portion 22 of the elbow joint 21 is screwed with the second female screw portion 23 for piping, so that the male screw portion is formed. 22 tip and engagement recess 19
The flange portion 18 is sandwiched between the end wall surfaces and the flange portion 18 and the inner pipe 3 are fixed to the connection head 9.

The second pipe female screw portion 23 is formed along the axial direction of the inner pipe 3. A hose 24 is detachably attached to one end of the elbow joint 21, and a connecting direction of the hose 24 to the elbow joint 21 is parallel to a connecting direction of the hose 17 to the straight joint 14. It is set as follows.

According to the mold cooling apparatus having the above-described structure, the cooling liquid flowing from the elbow joint 21 into the internal passage (outward path) 6 of the inner pipe 3 reaches the cooling space 5 on the front end side, The liquid passes through the gap passage (return path) 7 between the two pipes 2 and 3 to reach the liquid chamber 13, and flows out through the straight joint 14 screwed into the first pipe female screw portion 16.
As described above, while the cooling liquid passes through the inside of the connection head 9, it only passes through the single liquid chamber 13 as a volume chamber, and the liquid chamber 13 corresponds to the through arrangement of the inner pipe 3. Since it has a sufficient flow path area and flow path length, the flow of the cooling liquid is not hindered. Therefore, it is possible to secure the smooth circulation of the coolant while reducing the size and weight of the connection head 9 and the space for disposing the connection head 9. Further, since there is no volume chamber accommodating the holding pipe in the middle of the flow path from the female screw portion 23 for the second pipe to the internal passage 6 of the inner pipe 3, the passage configuration of this portion is not provided. Is simplified.

The female thread portion 1 for a pipe of the connection head 9
If the outer pipe 2 screwed into the inner pipe 2 and the inner pipe 3 in which the flange portion 18 engaged with the engaging concave portion 19 is fixedly integrated can only be removed from the connection head 9 by unscrewing or disengaging. The straight joint 14 screwed to the first female thread portion 16 for the pipe and the elbow joint 21 screwed to the female screw portion 23 for the second pipe can also be removed from the connection head 9 by unscrewing. it can. The inner pipe 3 is detached by detaching the elbow joint 21 and then pulling out the flange 18 and the inner pipe 3 through the second female thread 23 for piping toward the base end. Therefore, it is possible to perform the work of removing scale, etc. for each of the subdivided components, and the work is facilitated and assured. Also, if one of the components is damaged, only the component needs to be replaced, and the other components can be used continuously without replacement, which is economically advantageous. Become.

Further, an L-shaped elbow joint 21 is used as a pipe member to be screwed into the second female thread portion 23 for pipe.
Is used, it is possible to change the connection direction of the hose 24 as necessary, and accordingly, it is difficult to restrict the piping space and the layout, and it is possible to easily connect the external piping. .

FIG. 3 is a sectional view showing a main part of a mold cooling device according to a second embodiment of the present invention. In FIG. 3, the same components as those in the first embodiment shown in FIG. 2 described above are denoted by the same reference numerals, and description thereof will be omitted. The second embodiment is different from the first embodiment in that the connection head 9 includes a female pipe thread 12,
The liquid chamber 31 and the communication passage 32 communicating from the second pipe female screw part 35 to the liquid chamber 31 are sequentially connected to each other, and the pipe female screw part 12 is connected to the flange 18 of the inner pipe 3. The point where the compression coil spring 30 is inserted into the liquid chamber 31 and the outer pipe 2 is inserted into the inner pipe 3 after the
And a compression coil spring 3 at the base end of the outer pipe 2.
0 is pressed. Note that the base end portion of the liquid chamber 31 is an engagement recess 19 with which the flange 18 is engaged.

The flange 18 of the inner pipe 3 is pressed against the end wall of the liquid chamber 31 by the elastic force of the compression coil spring 30,
As a result, the inner pipe 3 is supported by the connection head 9 with a required holding force. In this case, the outer diameter of the flange 18 is
The diameter is smaller than the inner diameter of the spring chamber 31 and the inner diameter of the female pipe thread 12. In addition, the second pipe female screw portion 35
Since the communication passage 32 leading to the liquid chamber 31 is bent at a right angle on the way, the second pipe female screw portion 35 to which the second straight joint 34 is screwed is aligned with the axial center direction of the inner pipe 3. It is formed in a direction orthogonal to the direction.

Therefore, also in the second embodiment, while the cooling liquid passes through the inside of the connection head 9, only the single liquid chamber 31 is passed as a volume chamber. The stored compression coil spring 3
Since 0 is not a factor that hinders the flowability of the coolant as compared with a tubular body or the like, a smooth flow of the coolant can be ensured. Further, in addition to the outer pipe 2, the inner pipe 3 in which the flange portion 18 is integrated, and the compression coil spring 30, the first straight joint 14 and the second straight joint 34 can also be removed from the connection head 9. The inner pipe 3 and the compression coil spring 30 are removed by removing the outer pipe 2 and then removing the female thread 12 for the pipe.
This is performed by pulling out the compression coil spring 30 to the distal end side, and pulling out the flange portion 18 and the inner pipe 3 to the distal end side through the liquid chamber 31 and the pipe internal thread 12.

FIG. 4 is a sectional view showing a main part of a mold cooling device according to a third embodiment of the present invention. In FIG. 4, the same components as those in the first embodiment shown in FIG. 2 described above are denoted by the same reference numerals, and description thereof will be omitted. This third embodiment is different from the above-described second embodiment in that an auxiliary passage 40 whose base end is opened is formed concentrically at the base end of the internal passage 6 of the inner pipe 3. This is a point that the auxiliary passage 40 is passed through the second straight joint 34, and the base opening of the auxiliary passage 40 is sealed with a blind plug (stop plug) 41. Therefore, according to the third embodiment, substantially the same operation and effect as those of the second embodiment can be obtained.

[0033]

As described above, according to the present invention, only a single liquid chamber is provided as a volume chamber in the flow path of the cooling liquid inside the connection head. Since the cooling liquid passage having an area can be formed, it is possible to secure a smooth flow of the cooling liquid while reducing the size and weight of the connection head and the space for disposing the connection head.

Further, since a volume chamber accommodating the holding pipe is not provided in the middle of the flow passage from the water supply port to the internal passage of the inner pipe, the passage configuration at the inlet side portion of the outward passage is simplified. It is possible to improve the flowability of the coolant in the inlet side portion.

Further, the outer pipe, the inner pipe, and the pipe member can be detached from the connection head by disengagement or disengagement, respectively, and disassembled. Work is facilitated and assured, and if one of the components is damaged, only that part needs to be replaced.
There is no need to replace other parts, and economical advantages are achieved.

In particular, according to the first aspect of the present invention, the pipe member is screwed into the water supply port with the flange fixed to the outer periphery of the base end of the inner pipe engaged with the engagement recess. Thus, the inner pipe is fixed by sandwiching the flange between the end of the pipe member and the end wall surface of the engagement recess, so that it is not necessary to separately provide a member for fixing the inner pipe, and the number of parts is reduced. Reduction is achieved.

According to the second aspect of the present invention, the liquid chamber is used not only as a space for accommodating a coil spring for fixing the inner pipe to the connection head, but also through the gap passage to the drain port. It also serves as a communication space for the connection head, and the liquid chamber provided solely in the connection head is effectively used. In addition, since the coil spring is a member that does not hinder the flow of the cooling liquid as compared with the tubular body or the like, the liquid chamber can appropriately function as a flow space of the cooling liquid, and a smooth flow of the cooling liquid is secured. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a mold cooling device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the mold cooling device according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view showing a main part of a mold cooling device according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view showing a main part of a mold cooling device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold cooling device 2 Outer pipe 3 Inner pipe 6 Internal passage (outgoing path) 7 Gap path (return path) 9 Connection head 12 Female screw part for pipe (pipe screwing hole) 13 Liquid chamber 14 Piping member (straight joint) 16 Female thread part for first piping (drain port) 18 Flange part 19 Engagement concave part 20 Fitting hole 21 Piping member (elbow joint) 23 Female thread part for second piping (water supply port) 30 Compression coil spring (coil spring) 31 Liquid Room

Claims (2)

[Claims] 1. An inner pipe is arranged concentrically on an inner circumference of an outer pipe, and an internal passage of the inner pipe is used as a forward path of a coolant.
A gap passage between the two pipes is used as a return path for the coolant, and a connection head to which the base ends of the two pipes are attached is provided with a water supply port communicating with the outward path and a drain port communicating with the return path. In the cooling device for a mold, a pipe screw hole into which a base end of the outer pipe is screwed, a liquid chamber communicating with the gap passage and a drain port, and the inner pipe are removed from the connection head. The fitting hole which is fitted so as to be able to be inserted, the engaging concave portion which is engaged with a flange provided on the outer periphery of the base end of the inner pipe, and the water supply port are sequentially connected on the axis of the outer pipe. The inner pipe is inserted from the water supply port through the inner periphery of the fitting hole, the liquid chamber, and the outer pipe screwed into the pipe screw hole, and the water pipe is inserted into the water supply port. A pipe member communicating with an outward path is screwed into the pipe member, and the tip of the pipe member is engaged with the engagement. Depending on the end wall of the recess,
A cooling device for a mold, wherein a flange portion of the inner pipe is sandwiched from both sides. 2. An inner pipe is arranged concentrically on an inner circumference of an outer pipe, and an internal passage of the inner pipe is used as a forward path of a coolant,
A gap passage between the two pipes is used as a return path for the coolant, and a connection head to which the base ends of the two pipes are attached is provided with a water supply port communicating with the outward path and a drain port communicating with the return path. In the mold cooling device, the connection head, a pipe screw hole into which a base end of the outer pipe is screwed, a liquid chamber communicating with the gap passage and the drain port, and the liquid chamber. A communication path for communicating with the water supply port is sequentially connected on the axis of the outer pipe, and the base end of the inner pipe and the coil spring are inserted into the liquid chamber from the pipe screw hole, The outer pipe is externally inserted into the inner pipe, the base end of the outer pipe is screwed into the pipe screw hole, the coil spring is pressed at the base end of the outer pipe, and the inner force is applied by the elastic force of the coil spring. Connect the flange of the pipe to the end wall of the liquid chamber. A cooling device for a mold, wherein the cooling device is pressed and held.