JP2006056042A - Mold cooling device and mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold cooling device capable of efficiently and certainly cooling a place to be cooled without complicating the structure of a mold and capable of reducing the load of a pump or the like, and a mold. <P>SOLUTION: The mold cooling device is equipped with a plurality of flexible second supply tubes 28, which supply a cooling liquid to the mold 1 having a plurality of bottomed cooling holes 13 bored therein and are arranged so that the leading end parts 29 thereof are inserted in the mold so as to reach the vicinity of the deep surfaces 30 of the cooling holes 13, and a pump 22 for discharging the cooling liquid to the deep surfaces 30 of the cooling holes 13 from the leading ends 29 of the second supply tubes 28. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mold cooling apparatus and a mold, and in particular, in a molding machine such as injection molding, a mold cooling apparatus for quickly solidifying a resin injected into the mold, and the mold The present invention relates to a mold in which a cooling device is used.

  Conventionally, as this type of mold cooling device, a coolant such as water or oil is sent to the mold via a coolant supply pipe to cool the mold, and the coolant is heated by cooling the mold. Is circulated to the cooler, cooled to a predetermined temperature, and then supplied to the mold again.

  As shown in FIG. 4, a plurality of cooling holes 41 are formed in the mold 40 in the vicinity of the cavity, for example, and a small-diameter cooling pipe 42 (jet tube) is provided in each cooling hole 41. Further, a supply passage 44 inserted between the supply ports 43 of the plurality of cooling pipes 42 and a coolant supply pipe (not shown), and a coolant jetted from the plurality of cooling pipes 42 are supplied to a reflux pipe (not shown). A guiding discharge passage 45 is formed in the mold 40. According to this, the coolant supplied via the coolant supply pipe flows through the supply passage 44 formed in the mold 40 into the cooling pipe 42 and is ejected from the outlet at the tip of the cooling pipe 42. The inner surface of the cooling hole 41 is cooled. The jetted coolant flows out of the cooling hole 41 through the outside of the cooling pipe 42, and is sent to the reflux pipe through the discharge passage 45 formed in the mold 40.

  The injection mold is generally composed of a fixed mold and a movable mold. However, in order to move the movable mold, a resin hose or the like can be used for the cooling liquid supply pipe and the reflux pipe. Flexible piping is used.

  Further, as shown in FIG. 5, the cooling pipe 46 is composed of an outer pipe 47 and an inner pipe 48, and each cooling pipe 46 inserted into the plurality of cooling holes 41 is extended to the outside of the mold 40. There is also known a mold cooling apparatus that includes a connection unit 49 that extends and further connects the coolant supply pipe 50 and the reflux pipe 51 directly to the extension.

  The above prior art is naturally performed by those skilled in the art, and the applicant is not aware of a document describing the prior art.

  However, in the mold cooling apparatus shown in FIG. 4, the supply passage 44 that communicates with the plurality of cooling pipes 42 and the discharge passage 45 that communicates with the plurality of cooling holes 41 must be formed in the mold 40. The structure of the mold 40 is extremely complicated. In other words, the location where the cooling hole 41 is drilled is restricted, and even if there is a portion that is to be locally cooled, it may be difficult to supply the coolant to that portion.

  Further, since the cooling liquid is supplied to the plurality of cooling pipes 42 via the supply passage 44, for example, the cooling liquid boils in the vicinity of the outlets of some of the cooling pipes 42, that is, in the back surface portion of the cooling hole 41. When the internal pressure of the cooling hole 41 becomes excessively high, it is difficult to supply the cooling liquid to the cooling pipe 42, and the cooling liquid may flow only through the other cooling pipes 42 having a relatively low internal pressure. .

  Further, since the conventional cooling pipe 42 is formed of a metal having a relatively high thermal conductivity such as stainless steel or brass, the cooling liquid flowing inside the cooling pipe 42 and the cooling liquid flowing outside the cooling pipe 42 are used. That is, heat exchange with the coolant that has become high temperature due to cooling of the mold is promoted, leading to a decrease in cooling efficiency. Furthermore, in the circulation type mold cooling apparatus, since the coolant is circulated, there is a concern that the metal cooling pipe 42 is corroded due to a decrease in the liquid quality, which may cause clogging.

  Furthermore, in the above mold cooling apparatus, since the cooling liquid is supplied from the cooler to the cooling pipe 42 via the cooling liquid supply pipe and the supply passage 44, the pressure loss is caused by the plurality of pipes and the joints connecting them. The load of a pump or the like provided for pumping the coolant increased.

  On the other hand, the mold cooling device shown in FIG. 5 does not require a supply passage or a discharge passage, so that the structure of the mold 40 is simplified and the coolant can be supplied to a necessary portion. On the other hand, the connection unit 49 must be disposed outside the mold 40, and it has been difficult to bring adjacent cooling pipes 46 closer to each other. That is, the interval between the cooling holes 41 is limited, and it is difficult to increase the cooling capacity.

  Therefore, in view of the above situation, the present invention can efficiently and surely cool a portion that needs to be cooled without complicating the structure of the mold, and can reduce the burden on the pump and the like. An object is to provide a mold cooling device and a mold.

  The mold cooling apparatus according to the present invention is “a flexible supply tube for supplying a coolant to a mold having a plurality of bottomed cooling holes, the tip portion of which is the mold. A plurality of supply tubes that are inserted into the mold and are arranged so as to reach the inner surface of each of the cooling holes, and the cooling liquid is pumped through the supply tubes, and the supply tubes And a pumping means for discharging the coolant from the tip of the nozzle toward the inner surface of the cooling hole.

  Here, the “metal mold” is a metal mold in a molding machine such as injection molding, and examples thereof include a fixed mold and a movable mold. The direction in which the “cooling hole” is formed is not particularly limited, and may be downward, upward, or lateral. The inner diameter of the “supply tube” is not particularly limited, but a small diameter of about 1 to 2 mm is preferable. Further, the cooling liquid whose temperature has been raised by cooling the mold may be disposed of as waste liquid, or may be refluxed and cooled by the cooling means and then supplied to the mold again.

  According to the present invention, the cooled coolant is supplied to the mold through a plurality of supply tubes. In particular, each of the supply tubes is inserted into the mold and its tip extends to the vicinity of the inner surface of each cooling hole, so that the cooling liquid pumped through the supply tubes is The liquid is discharged from the tip of the supply tube toward the inner surface of each cooling hole. In other words, it is possible to cool the back side portion of the cooling hole without using a metal cooling pipe that has been conventionally required and without forming a supply passage in the mold.

  In the mold cooling apparatus according to the present invention, it is preferable to adopt a configuration in which “the supply tube is formed of a resin”.

  According to this, even if it is a case where it applies to a custom circulation type mold cooling device, a supply tube does not corrode and by extension, obstruction of the supply tube due to corrosion is suppressed. That is, even when a small-diameter supply tube is used, it is possible to reliably pump the coolant to the inner surface of the cooling hole. In addition, since the resin has a lower thermal conductivity than the metal, the coolant passing through the supply tube can be prevented from being heated by the coolant flowing outside, that is, the coolant that has been heated. That is, the cooling efficiency can be increased.

  On the other hand, the mold according to the present invention is “a mold in which the mold cooling device of the present invention is used, and communicates with all the cooling holes to form a space in which the supply tube is disposed. And a discharge passage for collecting the coolant discharged from each of the supply tubes and discharging it to the outside ”.

  According to this, the coolant discharged from the tip of the supply tube flows through the outside of the supply tube, and is discharged from the cooling hole toward the discharge passage formed in the mold. That is, the coolant discharged from all the cooling holes is collected in the discharge passage and sent to the outside of the mold. In addition, since any supply tube is disposed through the discharge passage, it is possible to guide the supply tube to the cooling hole without providing a dedicated space for piping in the mold. Become.

  When the supply tube is disposed through the discharge passage as described above, the tip of the supply tube must be inserted one by one from the discharge passage into each cooling hole. However, it is extremely difficult to insert the supply tube into the hole that cannot be visually recognized from the outside, which is a serious problem in manufacturing.

  Therefore, in the mold cooling apparatus according to the present invention, “a viewing window of a size provided on the wall surface of the discharge passage located on the extension of the cooling hole, the size of the cooling hole being visible from the outside; It is preferable to employ a configuration that further includes a removable lid that closes the viewing window.

  According to this, the inspection window is opened by removing the lid, and it becomes possible to make all the cooling holes visible from the outside. For this reason, the operator can insert the plurality of supply tubes inserted into the discharge passage one by one into each cooling hole while visually confirming. Therefore, workability in manufacturing can be greatly improved and productivity can be increased.

  As described above, in the mold cooling apparatus of the present invention, the cooling liquid is supplied to the cooling hole using the flexible supply tube, so that the position where the cooling liquid can be supplied, that is, the cooling hole is formed. A position is not restrict | limited and a desired site | part can be cooled reliably. In addition, since no joints or other pipes are connected to at least the downstream side of the supply tube, pressure loss at the tip can be suppressed, and the load on the pumping means can be reduced. Furthermore, since a connection unit or the like is not required, the interval between the cooling holes can be made as close as possible, and as a result, the cooling capacity can be increased.

  Hereinafter, a mold 1 according to an embodiment of the present invention and a mold cooling device 2 for cooling the mold 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a system configuration diagram schematically showing the configuration of the mold 1 and the mold cooling device 2, FIG. 2 is a perspective view showing the configuration of the mold 1, and FIG. 3 is a view window of the mold 1. It is a perspective view which shows a structure.

  As shown in FIG. 2, the mold 1 of this example is an injection mold, and includes a fixed mold 3 and a movable mold 4 that can be clamped and opened with respect to the fixed mold 3. It is configured. A cavity (not shown) corresponding to the shape of the molded product is formed on the mold combining surface (so-called split surface) of the fixed mold 3 and the movable mold 4, and the melt injected from the injection nozzle (not shown). The resin is filled in the cavity through a sprue, a liner, a gate (not shown) and the like formed in the fixed mold 3. In the mold 1 of the present example, the fixed mold 3 includes a fixed mold plate 5 and a fixed side mounting plate 6, and the movable mold 4 includes a movable mold plate 9, a movable side mounting plate 10, and a nest 11 (FIG. 1). See). That is, the fixed mold 3 is directly carved and the movable mold 4 employs a nested structure with a bottomed frame structure.

  By the way, the mold 1 has a characteristic configuration so that the temperature in the vicinity of the cavity can be cooled using the mold cooling device 2 (see FIG. 1). In this example, both the fixed mold 3 and the movable mold 4 can be cooled, but since they adopt the same configuration, only the movable mold 4 will be specifically described here.

  As shown in FIG. 1, the movable mold 4 including the movable side mounting plate 10, the movable mold plate 9, and the nest 11 has a bottomed cooling that communicates from the movable side mounting plate 10 to the dividing surface of the nest 11, that is, near the cavity. A plurality of service holes 13 are formed. In each cooling hole 13, the portion formed in the movable mold 9 and the portions on both sides thereof have a larger diameter than other portions (that is, the end portion side of the cooling hole 13). An outer pipe 16 having an O-ring 15 mounted on the outer peripheral surface is inserted. The outer pipe 16 and the O-ring 15 ensure water tightness between the movable mold plate 9, the movable side mounting plate 10, and the insert 11, and the inner diameter of the outer pipe 16 is on the end side of the cooling hole 13. It almost coincides with the diameter.

  The movable mounting plate 10 is formed with a discharge passage 14 that communicates with all the cooling holes 13 and collects the coolant discharged from the cooling holes 13. The discharge passage 14 is open to the outside of the mold 1, and is configured to collect the coolant heated by cooling the mold 1 and discharge it to the outside of the mold 1.

  On the other hand, the mold cooling device 2 supplies a cooling device 21 such as a cooling heat exchanger that cools the cooling liquid, a pump 22 that pumps the cooling liquid, and the cooled cooling liquid to the mold 1. And a circulation circuit 23 for circulating the coolant discharged from the mold 1. The circulation circuit 23 is provided with a manifold 24, and the manifold 24 and the inlet of the cooling device 21, the outlet of the cooling device 21 and the inlet of the pump 22, and the outlet of the pump 22 and the manifold 24 are connected to the circulation pipe 23, respectively. 26 is connected. Here, the pump 22 corresponds to the pressure feeding means of the present invention.

  Further, a distributor 25 is interposed in the circulation circuit 23, and the manifold 24 and the distributor 25 are connected by a first supply tube 27. As shown in FIG. 2, the distributor 25 is provided to distribute the coolant supplied by the first supply tube 27 to the plurality of second supply tubes 28. The diameter is extremely small compared to the first supply tube 27 (for example, the inner diameter is about 1 to 2 mm). Here, the second supply tube 28 corresponds to the supply tube of the present invention.

  That is, each of the second supply tubes 28 is inserted into the mold 1 through the discharge passage 14, and its tip 29 is extended to the vicinity of the back surface 30 of each cooling hole 13. That is, the number of the second supply tubes 28 is equal to the number of the cooling holes 13, and the tip end portions of the second supply tubes 28 are inserted into the respective cooling holes 13 one by one. The tip 29 is opposed to the back surface 30 of the cooling hole 13. The second supply tube 28 is formed of a heat-resistant resin having flexibility.

  Further, the discharge passage 14 and the manifold 24 in the mold 1 are connected via a reflux pipe 33, and the coolant discharged from the discharge passage 14 to the outside of the mold 1 is refluxed via the reflux pipe 33. Is configured to do. A drainage joint / sealing metal fitting 32 for closing the opening of the discharge passage 14 is provided at the outlet of the discharge passage 14, and one end of the reflux pipe 33 is connected and the second supply tube 28 is watertight. It is possible to pass in the state.

  By the way, as shown in FIG. 3, on the wall surface 34 of the discharge passage 14 positioned on the extension of the cooling hole 13, a viewing window 35 sized to make all the cooling holes 13 visible from the outside, and a seal A detachable lid body 36 that closes the viewing window 35 via a member (not shown) is provided, and the position of the cooling hole 13 can be visually confirmed by removing the lid body 36. It has become.

  Then, the cooling method of the metal mold | die 1 is demonstrated. When the pump 22 is operated, the cooling liquid cooled by the cooling device 21 is sent to the first supply tube 27 via the manifold 24. Since the plurality of second supply tubes 28 are connected to the first supply tube 27 via the distributor 25, the cooling liquid is evenly distributed by the plurality of second supply tubes 28, and the mold 1 is supplied. At this time, each of the second supply tubes 28 is inserted into the individual cooling holes 13 through the discharge passages 14, and the tips thereof are arranged so as to reach the vicinity of the inner surface 30 of the cooling holes 13. Therefore, the cooling liquid fed through the second supply tube 28 is discharged from the tip 29 of the second supply tube 28 toward the back surface 30 of each cooling hole 13. Accordingly, the back surface 30 portion of the cooling hole 13 is cooled by being deprived of heat by the coolant discharged from the second supply tube 28. Thus, in the cooling process after the injection filling process, the time until the material is cooled and solidified is shortened and the productivity is increased by cooling the mold 1.

  The coolant discharged from the tip 29 of the second supply tube 28, specifically the coolant that has not been vaporized, flows through the outside of the second supply tube 28 and is discharged from the cooling hole 13 to the discharge passage 14. Thereafter, the refrigerant is refluxed to the cooling device 21 through the reflux pipe 33 and the connection pipe 26 connected to the discharge passage 14.

  As described above, according to the mold cooling apparatus 1 described above, the cooling liquid is supplied to the respective cooling holes 13 using the flexible second supply tube 28, and therefore the position where the cooling liquid can be supplied. That is, the drilling position of the cooling hole 13 is not limited. Therefore, the site | part which needs cooling can be cooled reliably. Further, since no joints or other pipes are connected to the downstream side of the second supply tube 28, pressure loss at the tip is suppressed, and the load on the pump 22 can be reduced. Furthermore, since the space | interval of the cooling holes 13 can be brought close to the limit, cooling capacity can be improved significantly.

  In addition, according to the mold cooling apparatus 1 described above, the resin-made second supply tube 28 is used, so that even if the liquid quality of the cooling liquid deteriorates, it does not corrode and suppresses blockage due to corrosion. can do. That is, even when the thin second supply tube 28 is used, the coolant can be reliably pumped to the back surface 30 portion of the cooling hole 13. In addition, since the resin has a lower thermal conductivity than the metal, heat exchange inside and outside the second supply tube 28 can be suppressed, and heating of the coolant flowing inside the second supply tube 28 can be suppressed. . That is, the mold 1 can be efficiently cooled.

  Further, according to the mold cooling apparatus 1 described above, since the plurality of second supply tubes 28 are disposed using the discharge passage 14, a dedicated space for piping is separately provided in the mold 1. Without this, the second supply tube 28 can be guided to the cooling hole 13. That is, cooling can be performed without complicating the structure of the mold 1. Further, since a viewing window 35 is formed on the wall surface 34 of the discharge passage 14, it is possible to visually recognize all the cooling holes 13 from the outside by removing the lid body 36. The operation of inserting the supply tube 28 into the cooling hole 13 can be made extremely easy.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  That is, in the mold cooling apparatus 1 of the present embodiment, the distributor 25 is provided separately from the manifold 24 in order to distribute the coolant to the plurality of second supply tubes 28. The supply tube 28 may be connected directly to the manifold 24 and distributed by the manifold 24.

  Further, in the present embodiment, the case where the mold cooling device 2 is applied to the movable mold 4 including the movable mold plate 9, the movable attachment plate 10, and the insert 11 is shown, but the configuration of the mold is particularly limited. For example, the present invention may be applied to a mold composed of a template and a mounting plate.

  Furthermore, in this embodiment, the thing of the structure which ensures watertightness by providing the O-ring 15 and the outer pipe 16 in the inside of the cooling hole 13 was shown, However, For example, without using the outer pipe 16, it is movable type | mold. Seal members may be interposed between the plate 9 and the movable attachment plate 10 and between the movable mold plate 9 and the insert 11.

It is a system configuration figure showing typically the composition of the metallic mold cooling device which is one embodiment of the present invention, and a metallic mold. It is a perspective view which shows the structure of a metal mold | die. It is a perspective view which shows the structure of the observation window in a metal mold | die. It is sectional drawing which shows the structure of the conventional metal mold cooling apparatus. It is sectional drawing which shows the structure of the other conventional metal mold cooling apparatus.

Explanation of symbols

1 Mold 2 Mold cooling device 13 Cooling hole 14 Discharge passage 22 Pump (pressure feeding means)
28 Second supply tube (supply tube)
30 Back 34 Wall 35 Viewing Window 36 Lid

Claims (4)

A flexible supply tube for supplying a cooling liquid to a mold having a plurality of bottomed cooling holes drilled, the tip portion of which is inserted into the mold and each of the cooling holes A plurality of supply tubes arranged to reach the vicinity of the back surface of
A pressure feeding means for pumping the cooling liquid through the supply tube, and for discharging the cooling liquid from the tip of the supply tube toward the inner surface of the cooling hole. Mold cooling device. The mold cooling apparatus according to claim 1, wherein the supply tube is made of resin. A mold in which the mold cooling apparatus according to claim 1 or 2 is used,
It has a discharge passage that communicates with all the cooling holes, forms a space in which the supply tubes are disposed, and collects and discharges the coolant discharged from each of the supply tubes. Characteristic mold. A viewing window of a size provided on the wall surface of the discharge passage located on the extension of the cooling hole, the size of the cooling hole being visible from the outside;
4. The mold according to claim 3, further comprising a detachable lid that closes the viewing window.

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