JP2006175759A - Mold cooling pipe and mold cooling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold cooling pipe which prevents an increase in the amount of cooling water flowing into an inside passage of the pipe and the direct discharge of the cooling water without flowing into the inside passage and a mold cooling method. <P>SOLUTION: The mold cooling pipe 1 is arranged in the cooling hole 2A of the mold 2. The space between the outer pipe 3 and inner pipe 4 of the mold cooling pipe 1 is made an outside passage 1A, and a space in the inner pipe 4 is made the inside passage 1B. The inner pipe 4 fixed to a cap 5 is formed approximately in an L-shape, and the rear end 4B of the inner pipe 4 is extended outside the cap 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mold cooling pipe that is mounted in a cooling hole of a mold used for die casting, injection molding, or the like and cools the mold, and a mold cooling method using the mold cooling pipe.

  Conventionally, a cooling hole is formed in the mold in order to cool the molten metal filled in the cavity of the mold. The cooling hole is formed at a position in the vicinity of the cavity of the mold from the outer surface of the mold toward the inside, and has a substantially cylindrical shape. A mold cooling pipe is disposed in the cooling hole. As a result, a cooling structure is constructed in which cooling water is supplied into the cooling hole via the mold cooling pipe to cool the mold.

  As shown in FIG. 4, the conventional mold cooling pipe 101 disposed in the cooling hole 102 </ b> A formed in the mold 102 has an inner pipe 104 disposed concentrically in an outer pipe 103. The space between the outer pipe 103 and the inner pipe 104 is the outer flow path 101A, and the space inside the inner pipe 104 is the inner flow path 101B.

  The mold cooling pipe 101 is arranged so that the front end 104A of the inner pipe 104 is positioned at the inner end 102a of the cooling hole 102A formed in the mold 102, and the inner flow path 101B from the rear end 104B of the inner pipe 104. Cooling water is supplied inside. The cooling water reaches the tip 104A of the inner pipe 104, flows into the cooling hole 102A, passes through the outer flow path 101A, and is discharged from the rear end 103B of the outer pipe 103. Therefore, the inner flow path 101B and the outer flow path 101A form a forward path and a return path of the cooling water, respectively. As a prior art document showing a general technical level regarding such a cooling pipe, for example, Japanese Patent Application Laid-Open No. 2004-243369 can be cited.

JP 2004-243369 A

  The rear end 104B of the inner pipe 104 is fixed to the insertion hole 105A of the cap 105 by brazing or screwing or the like, but the rear end 104B of the inner pipe 104 comes out of the insertion hole 105A of the cap 105, or the inner pipe 104 The rear end 104B may corrode. In such a case, the amount of cooling water flowing into the inner flow path 101B from the rear end 104B of the inner pipe 104 is reduced, or the discharge flow path inside the discharge pipe 106 is kept without flowing into the inner flow path 101B. 106A is discharged, the water in the cooling hole 102A stagnates, and the heat of the mold cannot be taken away.

  Accordingly, the present invention provides a mold cooling pipe and a mold for preventing the amount of cooling water flowing into the inner flow path of the cooling pipe from being reduced or preventing the cooling water from being discharged without flowing into the inner flow path. An object is to provide a mold cooling method.

  In order to achieve the above object, the present invention provides an inner pipe 4 concentrically arranged in the outer pipe 3 so that the space between the outer pipe 3 and the inner pipe 4 is the outer channel 1A. In the mold cooling pipe 1 in which the space inside the inner pipe 4 serves as the inner flow path 1B, and the outer pipe 3 and the inner pipe 4 are fixed to the cap 5, the inner pipe 4 is substantially L-shaped. The rear end 4B of the inner pipe 4 extends to the outside of the cap 5 to provide the mold cooling pipe 1.

  The present invention also provides a mold cooling method for cooling a mold using the mold cooling pipe 1 according to claim 1.

  According to the mold cooling pipe of the first aspect of the present invention, the inner pipe is substantially L-shaped, and the rear end of the inner pipe extends outside the cap, so that it flows into the inner flow path of the cooling pipe. It is possible to prevent the amount of cooling water to be reduced or to be discharged as it is without flowing into the inner flow path.

  According to the mold cooling method of claim 2 of the present invention, the amount of cooling water flowing into the inner flow path of the cooling pipe can be reduced, or the cooling water can be discharged without flowing into the inner flow path. Therefore, stable mold cooling can be performed.

  A mold cooling pipe and a mold cooling method according to an embodiment of the present invention will be described with reference to FIGS. A mold cooling pipe 1 is disposed in the cooling hole 2 </ b> A formed in the mold 2. The mold cooling pipe 1 has an outer pipe 3, an inner pipe 4 disposed concentrically with the outer pipe 3, and a cap 5 to which the outer pipe 3 and the inner pipe 4 are fixed. A space between the outer pipe 3 and the inner pipe 4 is an outer flow path 1A, and a space inside the inner pipe 4 is an inner flow path 1B. The mold cooling pipe 1 is disposed so that the tip 4A of the inner pipe 4 is positioned at the inner end 2a of the cooling hole 2A, and cooling water is supplied into the inner flow path 1B inside the inner pipe 4. The cooling water reaches the front end 4A of the inner pipe 4 and flows into the cooling hole 2A, and then flows from the front end 3A of the outer pipe 3 into the outer flow path 1A. Led in. An O-ring 7 is disposed in the plurality of grooves 3 a formed on the outer periphery of the outer pipe 3 to prevent the cooling water from leaking from the cooling hole 2 </ b> A to the outside of the mold 2. The inner flow path 1B and the outer flow path 1A form a forward path and a return path of the cooling water, respectively.

  The inner pipe 4 is formed in a substantially L shape by bending a straight copper pipe to approximately 90 degrees with a jig, and is inserted from the through hole 5A of the cap 5 as shown in FIG. As shown in FIGS. 1 and 3, the inner pipe 4 inserted into the through hole 5A has a rear end 4B extending outside the cap 5, and a gap between the bent portion 4C of the inner pipe 4 and the through hole 5A. Is fixed by brazing. As described above, since the rear end 4B of the substantially L-shaped inner pipe 4 extends outside the cap 5, the inner flow path 1B is caused by a defect in the state in which the rear end 4B of the inner pipe 4 is fixed to the cap 5. There is no reduction in the amount of cooling water flowing into the channel, and no cooling water flowing into the inner flow path 1B.

  As shown in FIG. 1, the rear end 3 </ b> B of the outer pipe 3 is fixed to the cap 5 by brazing, and the outer flow path 1 </ b> A formed in the space between the outer pipe 3 and the inner pipe 4 is a through hole of the cap 5. It communicates with 5A.

  The cap 5 is formed with a discharge hole 5B orthogonal to the through hole 5A, and the tip 6A of the discharge pipe 6 is inserted and fixed by brazing. The discharge flow path 6C, which is the space inside the discharge pipe 6, communicates with the through hole 5A and constitutes the return path of the cooling water together with the outer flow path 1A and the through hole 5A.

 A hose (not shown) is connected to the rear end 4B of the inner pipe 4 and the rear end 6B of the discharge pipe 6.

  In the mold cooling method, cooling water is sent from a cooling water supply device (not shown) via a hose (not shown), and the cooling water is supplied from the rear end 4B of the inner pipe 4 to the inner flow path 1B. The cooling water flows from the tip 4A of the inner pipe 4 into the cooling hole 2A, flows from the cooling hole 2A to the outer flow path 1A, and is guided to a hose (not shown) through the through hole 5B and the discharge flow path 6C in the cap 5. It is discharged. Thus, a mold cooling method is performed by flowing cooling water.

  The mold cooling pipe and the mold cooling method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims.

  The mold cooling pipe and the mold cooling method of the present invention are extremely useful in the fields of casting such as die casting and injection molding.

Sectional drawing which shows the cooling pipe for metal mold | die by this Embodiment. The perspective view which shows the assembly stage of the cooling pipe for metal mold | dies by this Embodiment. The perspective view which shows the cooling pipe for metal mold | die by this Embodiment. Sectional drawing which shows the conventional cooling pipe for metal mold | dies.

Explanation of symbols

1 Cooling pipe for mold 1A Outer channel 1B Inner channel 2 Mold 2A Cooling hole 3 Outer pipe 4 Inner pipe 5 Cap 5A Through hole

Claims (2)

An inner pipe is disposed concentrically in the outer pipe, a space between the outer pipe and the inner pipe is an outer flow path, and a space inside the inner pipe is an inner flow path, In the mold cooling pipe, the pipe and the inner pipe are fixed to a cap, wherein the inner pipe is substantially L-shaped, and a rear end of the inner pipe extends to the outside of the cap. Mold cooling pipe. A mold cooling method comprising cooling a mold using the mold cooling pipe according to claim 1.

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