JP2007144457A - Cooling pipe for die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling pipe for a die where the residence time of cooling water discharged from the water discharge port at the tip of an inner pipe in a die cooling hole is prolonged with a simple structure, thus, the cooling effect for the die can be relatively increased, and further, maintenance such as the removal of scale is facilitated. <P>SOLUTION: An inner pipe 2 is arranged in an outer pipe 1; further, the inner pipe 2 is formed so as to be made longer than the outer pipe 1 so that the inner pipe 2 is projected to the inside of a die cooling hole 5, and a going way 7 and a returning way 8 of cooling water are formed. The outer circumference of the inner pipe 2 projected into the die cooling hole 5 is provided with a flow guiding member 4 formed so as to be a coiled shape, and the cooling water heat-exchanged in the die cooling hole 5 is guided to the returning way 8 of the cooling water at the inside of the die cooling hole 5 along the flow guiding member 4. Further, the flow guiding member is provided freely movably to the axial direction of the inner pipe so as to be brought into slidable contact with the outer circumferential face of the inner pipe and/or the inner circumferential face of the die cooling hole. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mold cooling pipe for cooling a mold by mounting it in a mold cooling hole of a mold used for die casting, injection molding or the like, and in particular, an inner pipe is arranged in an outer pipe. In addition, the inner pipe is formed to be longer than the outer pipe so as to protrude into the mold cooling hole to form a cooling water forward path and a return path, and water is introduced to one end side of the outer pipe and the inner pipe to the cooling water forward path. The present invention relates to a mold cooling pipe configured by attaching a hose connection base provided with a connection port and a water discharge connection port leading to a cooling water return path.

Many types of improvement proposals have been made for this type of cooling pipe for molds, and it has been put into practical use (see, for example, Patent Documents 1 and 2). When this type of mold cooling pipe is used to cool the mold, it is obvious that the cooling effect can be enhanced according to the amount of cooling water supplied into the mold cooling hole.
However, in the conventional one, since the residence time of the cooling water in the mold cooling hole is short, it is discharged from the cooling water return path without sufficient heat exchange in the mold cooling hole. The cooling effect of the mold was low with respect to the amount of cooling water to be produced. For this reason, the mold may be insufficiently cooled, particularly in a region where the product thickness is thick.

Japanese Patent Laid-Open No. 2004-154796 JP 2004-298922 A

  The present invention has been made in view of the above situation, and makes it possible to prolong the residence time of the cooling water inside the mold cooling hole with a simple structure, and relatively cool the mold. It is an object of the present invention to provide a mold cooling pipe that can enhance the effect and can facilitate maintenance such as removal of water scale inside the mold cooling hole at low cost.

The mold cooling pipe according to the present invention, which achieves the above object, includes an inner pipe disposed in the outer pipe and the outer pipe formed longer than the outer pipe so as to protrude into the mold cooling hole. The pipe and the inner pipe form a cooling water forward path and a return path, and a hose connection base having an inlet connection port leading to the cooling water outbound path and an outlet connection port leading to the cooling water return path on one end side of the outer pipe and the inner pipe. A cooling pipe for a mold constituted by mounting a flow guide member formed in a coil shape on the outer periphery of the inner pipe protruding into the mold cooling hole, and heat in the mold cooling hole The cooling water to be replaced is configured to be guided along the flow guide member to the return path of the cooling water (claim 1).
At this time, the flow guide member may be formed not only in the outer peripheral portion of the inner pipe but also in a length extending from the outer periphery of the inner pipe to the innermost part of the mold cooling hole (claim 2).
The flow guide member is preferably provided so as to be movable in the axial direction of the inner pipe so as to be in sliding contact with the outer peripheral surface of the inner pipe and / or the inner peripheral surface of the mold cooling hole.

  According to the mold cooling pipe of the present invention, the flow guide member formed in a coil shape is provided on the outer periphery of the inner pipe protruding into the mold cooling hole, and heat exchange is performed in the mold cooling hole. Since the cooling water is configured to be guided along the flow guide member to the return path of the cooling water, the cooling water in the mold cooling hole flows spirally along the flow guide member, and the gold is correspondingly increased. The residence time inside the mold cooling hole can be prolonged. Accordingly, heat exchange inside the mold cooling hole can be sufficiently performed without waste. As a result, the amount of cooling water supplied can cool at least the mold, and the mold cooling effect can be relatively improved. Can be increased.

  Moreover, the flow guiding member can be constructed simply because it does not require the outer pipe or the inner pipe to be specially processed and molded, for example, by simply diverting the existing coil spring and inserting it into the outer periphery of the inner pipe. It is easy to manufacture and can be provided at low cost.

  In particular, according to the cooling pipe for a mold according to claim 2, the flow guiding member is formed to have a length extending from the outer periphery of the inner pipe to the innermost part of the mold cooling hole. It is possible to omit the trouble of fixing to the outer pipe or the inner pipe so as not to drop off from the outer periphery of the inner pipe and the means configuration for fixing.

  Furthermore, in particular, according to the cooling pipe for molds according to claim 3, the flow guiding member is movable in the axial direction of the inner pipe so as to be in sliding contact with the outer peripheral surface of the inner pipe and / or the inner peripheral surface of the mold cooling hole. Therefore, the flow guide member moves in the axial direction of the inner pipe with the flow of cooling water, and the outer peripheral surface of the inner pipe and the inner peripheral surface of the mold cooling hole are rubbed against the flow guide member. As a result, the flow guide member itself, the outer peripheral surface of the inner pipe, and the inner peripheral surface of the mold cooling hole are automatically cleaned (removal of scale etc.), so that the maintenance inside the mold cooling hole can be facilitated. I can do it.

  Hereinafter, specific preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and various variations are conceivable.

  The mold cooling pipe A according to the present invention includes an outer pipe 1 and an inner pipe 2 that are arranged concentrically with each other, a hose connection base 3 that is integrally attached to one end side of the outer pipe 1 and the inner pipe 2, and the like. The cooling water flow guide member 4 is provided on the outer peripheral portion of the inner pipe 2 protruding into the mold cooling hole 5 in a state where it can be removed or cannot be removed.

The mold cooling pipe A is removable from the mold cooling hole 5 drilled from the back side of the mold B toward the cavity, and cooling water leaks from the mold cooling hole 5. In addition, it is fixed in a stationary state with a pressing plate 6 provided on the back side of the mold B as necessary so as not to be inadvertently dropped from the mold cooling hole 5.
Incidentally, the embodiment shown in FIGS. 1 and 2 can be removed from the mold cooling hole 5 by forming a screw 11 on the outer periphery of the outer end of the outer pipe 1 and screwing it onto the mold B. In addition, the cooling water is inserted and mounted so as not to leak out of the mold cooling hole 5. In addition to the embodiment shown in FIGS. 1 and 2, an O-ring may be attached in place of the screw 11.

The outer pipe 1 and the inner pipe 2 are formed using a hollow pipe material having a required inner diameter and length made of stainless steel or copper, as in the conventional case.
At this time, the inner pipe 2 is concentrically arranged in the outer pipe 1 and is formed longer than the outer pipe 1 so as to protrude into the inner part of the mold cooling hole 5. The embodiment shown in FIG. In this case, the inside of the inner pipe 2 is the cooling water forward path 7, and the cooling water return path 8 is formed between the inner peripheral surface of the outer pipe 1 and the outer peripheral surface of the inner pipe 2.
Contrary to the embodiment shown in FIGS. 1 and 2, a cooling water forward path 7 is provided between the inner peripheral surface of the outer pipe 1 and the outer peripheral surface of the inner pipe 2, and the cooling water is provided in the inner pipe 2. It may be a return trip.

  On the other hand, the hose connection base 3 that is integrally attached to one end of the outer pipe 1 and the inner pipe 2 is provided with a water inlet connection 3 a that leads to the cooling water forward path 7 and a water outlet connection 3 b that leads to the cooling water return path 8. The water supply connection port 3a and the water supply connection port 3b are connected to a water supply hose and a drainage hose respectively communicating with the outside.

  Accordingly, in the case of the embodiment shown in FIGS. 1 and 2, the water is discharged from the water inlet connection port 3a of the hose connection base 3 through the inner pipe 2 (outward passage 7 of the cooling water) from the tip water outlet 2a of the inner pipe 2. The cooled cooling water is heat-exchanged inside the mold cooling hole 5, that is, in a space formed by the inner peripheral surface 5 a of the mold cooling hole 5 and the outer peripheral surface of the inner pipe 2. It passes through the cooling water return path 8 formed between the pipes 2 and is discharged from the water outlet connection port 3 b of the hose connection base 3.

In addition, a flow guide member 4 formed in a coil shape is provided on the outer periphery of the inner pipe 2 protruding and inserted into the mold cooling hole 5.
The flow guide member 4 is cooled while rotating the outer periphery of the inner pipe 2 spirally along the flow guide member 4 along the flow guide member 4 in the mold cooling hole 5 with cooling water exchanged in the mold cooling hole 5. It is formed in a coil shape so that it can be guided to the water return path 8 and can be attached to or detached from the outer periphery of the inner pipe 2.

  That is, the flow guide member 4 can be diverted from, for example, a commercially available coil spring material that has been cut to a required length, and the inner diameter, the wire diameter, the length, and the coil of the coil spring material to be used. The optimal pitch of the (spiral) is appropriately selected depending on the cooling conditions of the mold cooling hole 5 in which the mold cooling pipe is mounted.

  At this time, the inner peripheral surface of the flow guiding member 4 is made as close as possible to the outer peripheral surface of the inner pipe 2 so that the cooling water flows while rotating spirally along the flow guiding member 4 inside the mold cooling hole 5. Further, it is preferable that the outer peripheral surface of the flow guide member 4 is set as close as possible to the inner peripheral surface 5a of the mold cooling hole 5. Then, it becomes easy to control the flow of the cooling water, and at the same time, the inner peripheral surface 5a side of the mold cooling hole 5 can be further cooled.

  Further, the flow guide member 4 may be formed short so as to exist only in the outer peripheral portion of the inner pipe 2 as in the embodiment shown in FIG. 1, or the inner pipe as in the embodiment shown in FIG. 2 may be formed and arranged in a length that extends to the innermost part of the mold cooling hole 5 without stopping at only the outer peripheral portion. In the latter case, the flow guide member 4 may be formed to be the same as or slightly shorter than the distance (L) from the tip of the outer pipe 1 to the innermost part of the mold cooling hole 5 or slightly less than the distance (L). The flow guide member 4 may be compressed when formed long and mounted in the mold cooling hole 5.

  At this time, particularly when the flow guide member 4 is formed to be slightly longer than the distance (L), the flow guide member 4 can move in the axial direction of the inner pipe with the momentum of the cooling water. It is preferable to select a coil spring having a small rigidity (spring force).

  Further, the flow guide member 4 may be fixed to the inner pipe 2 or the outer pipe 1 so as not to fall off from the outer peripheral portion of the inner pipe 2, or can be freely moved along the axial direction of the inner pipe 2 without being particularly fixed. It may be provided in a free state so that it can be moved to. In particular, if the flow guide member 4 is formed slightly shorter than the distance (L) and is provided in a free state so as to be freely movable along the axial direction of the inner pipe 2, the flow guide member 4 itself and the inner pipe are provided. 2. Cleaning of the outer periphery (removal of scale etc.) is automatically performed.

  In this case, it is preferable to provide the flow guide member 4 so as to be movable in the axial direction of the inner pipe 2 so as to be in sliding contact with the outer peripheral surface of the inner pipe 2 and / or the inner peripheral surface of the mold cooling hole 5. That is, by forming the inner diameter of the flow guide member 4 slightly larger than the outer diameter of the inner pipe 2 and fitting it into the outer periphery of the inner pipe 2 in a free state, the flow guide member 4 can be The pipe 2 moves in the axial direction, and the flow guide member 4 comes into sliding contact with the outer peripheral surface of the inner pipe 2 and the inner peripheral surface of the mold cooling hole 5 at that time.

  Further, when the flow guide member 4 is attached so as not to drop off from the outer peripheral portion of the inner pipe 2, it may be attached to the inner pipe 2 or the outer pipe 1 in a detachable state, or may be attached in a non-detachable state. Specifically, for example, as shown in the embodiment shown in FIG. 1, a retaining protrusion or protrusion 10 is formed on the outer periphery of the tip of the inner pipe 2, and the flow guide member 4 is dropped on the retaining protrusion or protrusion 10. A method of attaching by suspending so that the inner diameter of the flow guiding member 4 is slightly smaller than the outer diameter of the inner pipe 2, and a method of fixing the crimping so as to be caulked, or a part of the flow guiding member 4 A method of attaching the inner pipe 2 or the outer pipe 1 by welding is conceivable.

Sectional drawing of the state with which the cooling hole of the metal mold | die which shows an example of this invention implementation was mounted | worn. Sectional drawing of the state mounted | worn in the cooling hole of the metal mold | die which shows the other Example of this invention.

Explanation of symbols

A: Mold cooling pipe B: Mold 1: Outer pipe 2: Inner pipe 3: Hose connection base 3a: Inlet connection port 4: Flow guide member 3b: Outlet connection port 5: Mold cooling hole 6: Presser plate 7 : Cooling water outward path 8: Cooling water return path 10: Retaining protrusion or protrusion

Claims (3)

The inner pipe is arranged in the outer pipe, and the inner pipe is formed longer than the outer pipe so as to protrude into the mold cooling hole, and the outer pipe and the inner pipe form a forward path and a return path of the cooling water. A cooling pipe for a mold configured by attaching a hose connection base having a water inlet connection port leading to the cooling water forward path and a water outlet connection port leading to the cooling water return path to one end side of the outer pipe and the inner pipe,
A flow guide member formed in a coil shape is provided on the outer periphery of the inner pipe protruding into the mold cooling hole, and the cooling water heat-exchanged in the mold cooling hole is placed along the flow guide member to A mold cooling pipe characterized by being configured to be guided to a return path of cooling water.   2. The mold cooling pipe according to claim 1, wherein the flow guide member is formed to have a length extending from an outer periphery of the inner pipe to an innermost part of the mold cooling hole.   3. The flow guide member is provided to be movable in the axial direction of the inner pipe so as to be in sliding contact with the outer peripheral surface of the inner pipe and / or the inner peripheral surface of the mold cooling hole. Cooling pipe for mold as described in 2.

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