JP6664789B2 - Mold cooling structure - Google Patents

Description

  The present invention relates to a cooling structure in various molding dies such as a vacuum molding die provided in a molding die and having a flow path for a coolant.

There are various molding methods using a mold to mold a molded article such as a synthetic resin.
For example, a molding die used in an injection molding machine is provided with a fixed side and a movable side, and an uneven shape is formed at a central portion of abutting surfaces of the fixed side and the movable side molds facing each other. The space formed by the abutment is filled with a molten resin to obtain a molded product.
After molding, the mold is forcibly heated and cooled in order to lower the temperature quickly and to improve the efficiency of the operation cycle of injection molding.

Other methods include vacuum forming and pressure forming.
This is a molding method in which a heated and softened plastic sheet is stretched and brought into close contact with a molding die. Before the heat-softened thermoplastic resin sheet is cooled and solidified, the gap between the molding die and the sheet is evacuated (depressurized), The sheet is brought into close contact with a molding die to obtain a predetermined shape. After cooling, the mold is released and a molded product is taken out.

Unlike the injection molding and the like, the vacuum molding and the pressure molding have an advantage that it is sufficient to use only one of the convex mold and the concave mold.
However, in any of the molding methods, after the formed concavo-convex molded product is solidified, the molding die is forcibly cooled, and the concavo-convex molded product and the molding die are separated and taken out.

  Therefore, when providing a cooling flow path for cooling in the above molding die, the cooling flow path is formed along the uneven surface of the molded product to be cooled, thereby improving the cooling efficiency and as uniform as possible over the entire molded product. It is preferable to realize a proper cooling.

  However, even if the cooling flow path is simply formed in the mold along the upwardly protruding part of the uneven surface of the molded product, the upper part of the protruding flow path part may be formed in the mold. Because the surface is closed, the refrigerant supplied to the cooling flow path does not pass through the lower part of the protruding flow path part or circulates even if a part of the refrigerant enters the protruding flow path part It becomes a state where it has accumulated and accumulated, and in such a state, it is impossible to sufficiently cool the molded article.

Therefore, a flow path control structure for flowing the refrigerant from the cooling flow path to the protruding (branching) flow path section and from the protruding (branching) flow path section to the cooling flow path is required.
Japanese Patent Application Laid-Open No. 2002-210798 discloses a flow path control structure in which a cooling pipe is disposed in a projecting (branching) flow path. Japanese Patent Application Laid-Open No. 2003-305725 discloses a partition plate in a projecting (branching) branch flow path. Is disclosed.

JP 2002-210798 A JP 2003-305725 A

  The present invention has been made in view of the above problems, and in a flow path portion formed by being raised upward along a molded product and having an upper top surface closed, a refrigerant supplied to a cooling flow path is provided in the flow path portion. A cooling structure for a molding die, which prevents the refrigerant from passing through the lower portion and avoids a state in which the entered refrigerant stagnates and accumulates.

  The invention according to claim 1 of the cooling structure of a molding die according to the present invention is directed to a flat flow path through which a coolant provided in the molding die flows, and from the flat flow path along a surface to be cooled in the molding die. An upwardly protruding flow path for guiding the refrigerant is provided, a refrigerant supply port is provided on the upstream side of the flat flow path, a downstream side is closed, and one near the top surface of the protruding flow path on the most downstream side. An end opening is provided, and the other end is provided with a discharge pipe opened as a refrigerant discharge opening outside the mold.

  The invention of a cooling structure for a molding die according to a second aspect is the invention according to the first aspect, wherein the other end of the discharge pipe opened near the top surface of the protruding flow path on the most downstream side than the other end. The upper and lower positions of the top surface of the protruding flow path are formed to be lower.

  According to a third aspect of the present invention, there is provided a cooling structure for a molding die according to the first or second aspect of the invention, wherein the other protruding channel portion is provided with a baffle plate standing upright from the bottom surface of the flat channel to the vicinity of the top surface. Are provided over a range of

  According to a fourth aspect of the present invention, there is provided a cooling structure for a molding die according to the first or second aspect, wherein the flat flow path between the protruding flow paths is provided with a partition plate for blocking a flow of a refrigerant. A suction pipe having an opening at one end near the top surface of the other protruding flow path, and an opening at the other end of the partition plate serving as a refrigerant supply port. It is.

  According to a fifth aspect of the present invention, there is provided a cooling structure for a molding die according to any one of the first to fourth aspects, in the vicinity of the top surface of each of the protruding flow paths at the distal end of the discharge pipe, the baffle plate, and the suction pipe. Is characterized in that the wall surface is formed thick in the protruding flow channel in a state where the flow channel is narrowed.

  According to a sixth aspect of the present invention, there is provided a cooling structure for a molding die according to any one of the first to fifth aspects, wherein a fin is vertically provided on a top surface of the projecting flow path portion.

The invention according to claim 1 of the cooling structure for a molding die according to the present invention is provided with a refrigerant supply port on the upstream side of a flat flow path provided with the refrigerant in the molding die, and the downstream side is closed. The refrigerant supplied from the refrigerant supply port has no outlet in the flat channel, and fills the flat channel from the flat channel to the upwardly protruding channel that guides the refrigerant along the cooling target.
Then, the refrigerant flows out of the mold from the refrigerant discharge port at the other end of the discharge pipe opened to the outside of the mold from one end of the discharge pipe opened near the top surface of the protruding flow path on the most downstream side.
Therefore, not only the flat water channel but also the protruding flow path formed along the molded product to be cooled can be reliably filled with the refrigerant, and the effect of increasing the cooling action of the molded product is exhibited.

  The invention according to claim 2 has the effect of claim 1, and further includes the other protruding flow path portion located closer to the top surface of the protruding flow path portion on the most downstream side than the one end of the discharge pipe that is open. Since the upper and lower positions of the top surface are formed low, the other protruding flow path portions are reliably filled with the refrigerant up to the top surface, and have the effect of obtaining the expected cooling action.

According to a third aspect of the present invention, in addition to the effects of the first or second aspect, the baffle plate standing upright from the bottom surface of the flat flow passage to the vicinity of the top surface in the other protruding flow passage portion. Is provided across the width, so that the refrigerant is guided from the flat channel to the baffle plate and rises up the protruding flow channel portion to fill the upstream protruding flow channel portion, and climbs over the baffle plate to the downstream protruding flow channel. Down the section and return to a flat channel.
Further, since the same flow is repeated in the further protruding flow channel portion on the downstream side, the refrigerant supplied to the cooling flow channel is prevented from passing through the flat flow channel below the other protruding flow channel portion, and enters the cooling flow channel. This has the effect of avoiding the state in which the accumulated refrigerant stagnates and accumulates.

  According to a fourth aspect of the present invention, in addition to the effects described in the first or second aspect, the flat flow path between the protruding flow path portions is provided with a partition plate for blocking the flow of the refrigerant. One end is opened near the top surface of the other protruding flow path portion, and the suction port is provided at the other end as a refrigerant supply port and opened to the partition plate on the downstream side. The flow path portion and the flat flow path below the flow path portion are spaces separated by a partition plate, and the supply and discharge of the refrigerant are performed by the suction pipe, and the discharge is performed by one of the suction pipes opened near the top surface of the projecting flow path portion. Since it is made from the end opening, each protruding flow path portion is reliably filled with the refrigerant up to the top surface, and has the effect of obtaining the expected cooling action without stagnant accumulation.

  According to a fifth aspect of the present invention, in addition to the effects described in the first to fourth aspects, in addition to the effects described in the first to fourth aspects, the top of each of the protruding flow paths at the distal end of the discharge pipe, the baffle plate, and the suction pipe is provided. Since the wall surface near the surface is formed thick in the protruding flow channel in a state where the flow channel is narrowed, it is possible to prevent the possibility that the refrigerant stagnates and accumulates due to the narrow flow channel near the top surface, and furthermore, the The wall portions that may not come into contact with each other are narrowed, so that the effect of expecting smooth refrigerant flow and cooling can be obtained.

  The invention of the cooling structure for a molding die according to claim 6 has the effects described in claims 1 to 5, and furthermore, the fins are vertically provided on the top surface of the protruding flow path portion, so that the fins contact the refrigerant. The cooling from the top is conducted to the top surface to enhance the cooling effect, and has the effect of supplementing the cooling efficiency even if the top surface interferes with the refrigerant.

1 is a longitudinal sectional view of a molding die showing one embodiment of the present invention. It is a longitudinal cross-sectional view of a molding die showing another embodiment of the present invention. It is a longitudinal cross-sectional view of a molding die showing another embodiment of the present invention. It is a longitudinal cross-sectional view of a molding die showing another embodiment of the present invention. FIG. 9 is a partial longitudinal sectional view of a molding die showing another embodiment of the present invention. FIG. 9 is a partial longitudinal sectional view of a molding die showing another embodiment of the present invention.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a molding die 1 according to an embodiment of the present invention, in which an uneven portion is formed on an upper surface.

The molding die 1 is installed in a horizontal state as a molding die in a vacuum molding machine, and is used to obtain a molded product by molding and solidifying a molding material by using an uneven portion on an upper surface.
A space is formed inside the molding die 1, and the space is formed along the outer surface contour of the molding die 1 so as to leave a meat portion, and the refrigerant actively circulates in the space. Then, the molding die is cooled to cool the molded product.

In the space through which the refrigerant flows, a flat flow path 3 is formed in the substrate portion 2, and the protrusion 4 guides the refrigerant upward from the flat flow path 3 along the surface to be cooled in the molding die 1. 5A, and a coolant supply port 31 is provided on the upstream side of the flat channel 3.
A space on the downstream side of the flat flow path 3 is closed, and a discharge pipe 6 is provided in the protruding flow path portion 5B on the most downstream side, and one of the standing front end ports 61 is opened near the top surface, The other end 62 that is bent and extends in the horizontal direction of the flat flow path 3 serves as a refrigerant discharge opening and opens outside the template 1.

Therefore, the refrigerant supplied from the refrigerant supply port 31 has no outlet in the flat water channel 3 and fills up to the upwardly protruding flow channel portions 5A and 5B for guiding the refrigerant from the flat flow channel 3 along the cooling object. From the one end 61 of the discharge pipe 6 opened near the top surface of the protruding flow path portion 5B on the side, it flows out of the template 1 through the refrigerant discharge port of the other end 62 opened outside the template 1.
Therefore, not only the flat water channel 3 but also the protruding flow path portions 5A and 5B formed along the molded product to be cooled can be reliably filled with the refrigerant, and the molded product is cooled.

FIG. 2 is a longitudinal sectional view of the molding die 1 on the fixed side showing another embodiment.
The vertical position of the top surface of the other protruding flow path portion 5A is formed lower than the one end 61 of the discharge pipe 6 opened near the top surface of the protruding flow path portion 5B on the most downstream side.
Therefore, the other protruding flow path 5A is reliably filled with the refrigerant up to the top surface, and the expected cooling action can be obtained.

FIG. 3 is a longitudinal sectional view of the molding die 1 on the fixed side showing another embodiment, and a baffle plate 7 rising from the bottom surface of the flat flow passage 3 to the vicinity of the top surface in the other protruding flow passage portion 5A. Is formed over the lateral width.
Therefore, the refrigerant hits the baffle plate 7 from the flat water channel 3 and is guided to rise up the protruding flow path portion 5A to fill the protruding flow path portion 5A on the upstream side. The flow returns to the flat water channel 3 by flowing down the path portion 5A, and the same flow is repeated in the projecting flow path portion 5A further downstream.

  In this manner, the function of preventing the refrigerant supplied to the cooling flow path from passing through the flat flow path below the other protruding flow path portion 5A and avoiding the state in which the refrigerant that has entered stagnates and accumulates. To play.

FIG. 4 is a longitudinal sectional view of the molding die 1 on the fixed side showing another embodiment, and shows a flat channel 3 between the protruding channels 5A and between the protruding channels 5A and 5B. Is provided with a partition plate 8 for blocking the flow of the refrigerant.
A suction pipe 9 is provided in each of the other protruding flow paths 5A, and one of the upright end openings 91 is opened near the top surface, bent and extends in the lateral direction of the flat flow path 3. The other end port 92 serves as a refrigerant discharge port and opens to the partition plate 8 on the downstream side.

  Therefore, each of the protruding flow paths 5A and 5B and the flat flow path 3 therebelow become a space partitioned by the partition plate 8, and the supply and discharge of the refrigerant are performed by the suction pipe 9, and the discharge is performed by the protruding flow path 5A. Since the suction pipe 9 and the discharge pipe 6 have one ends 91 and 61 opened near the top surface of 5B, the protruding flow paths 5A and 5B are reliably filled with the refrigerant up to the top surface, and stagnate and accumulate. The expected cooling action can be obtained without the need.

FIG. 5 is a partial vertical cross-sectional view of the fixed-side molding die 1 showing another embodiment, and shows the protruding flow path portion at the distal end of the discharge pipe 6, the suction pipe 9, and the baffle plate 7. The wall surfaces near the top surfaces of 5A and 5B are formed in the protruding flow path portions 5A and 5B with a thickness 51 so that the flow paths are narrowed.
Therefore, the flow path near the top surface where the possibility that the refrigerant may accumulate and accumulate or a region where the refrigerant does not contact the wall surface may occur is narrowed, and a smoother refrigerant flow / cooling action can be expected.

FIG. 6 is a partial vertical cross-sectional view of the fixed-side molding die 1 showing another embodiment, in which fins 10 are suspended from the top surfaces of the protruding flow paths 5A and 5B, and contact with the refrigerant. The cooling from the fins 10 is conducted to the top surface.
The cooling from the fins 10 enhances the cooling of the top surface, and can supplement the cooling effect even if the top surface interferes with the coolant.

By the way, the more the distal ends of the discharge pipe 6, the suction pipe 9 and the baffle plate 7 are set closer to the top surfaces of the protruding flow passages 5A and 5B, the more the possibility that the refrigerant will stagnate or accumulate. Can be reduced.
However, in order to ensure the progress of the refrigerant, the one end 91 of the rising pipe 9 and the tip of the baffle plate 7 are set at the same position as the one of the rising tip 61 of the discharge pipe 6 or lower. Is preferred.

Further, since the space on the downstream side of the flat flow path 3 is closed, a small hole 11 for draining water is provided on the downstream side wall surface of the molding die 1 and a plug 12 is detachably attached. In the cleaning up when not in use, the refrigerant remaining in the space can be discharged, and similarly, the drain holes 13 which do not affect the filling of the refrigerant are provided also in the bases of the partition plate 8 and the baffle plate 7. Is preferred.
Further, in the production of the molding die of the present invention, although the configuration is complicated and finer than in the past, it can be formed by using, for example, a 3D printer.

  As mentioned above, although the mold used for the vacuum molding machine has been described as an example of the embodiment of the present invention, it is needless to say that the present invention is not limited to the above-described embodiment, and the mold of the molding machine of another method may be used. The present invention, which can be used and becomes apparent from the description in the specification and the drawings, widely covers the whole range of technical ideas that are truly intended.

DESCRIPTION OF SYMBOLS 1 Molding die 2 Substrate part 3 Flat flow path 4 Convex part 5A, 5B Projection flow path part 6 Discharge pipe 7 Baffle plate 8 Partition plate 9 Suction pipe 10 Fin 11 Drainage small hole 12 Plug 13 Drainage pore 31 Refrigerant Supply port 51 Thickness 61, 91 One end port 62, 92 Other end port

Claims (6)

  A flat flow path through which a coolant provided in the molding die flows, and an upwardly projecting flow path portion for guiding the refrigerant along the surface to be cooled in the molding die from the flat flow path, A refrigerant supply port is provided on the upstream side, the downstream side is closed, one end is opened near the top surface of the protruding flow path portion on the most downstream side, and the other end is a refrigerant discharge port and is outside the mold. A cooling structure for a molding die, comprising an open discharge pipe.   The vertical position of the top surface of the other protruding flow path portion is formed lower than one end of the discharge pipe opened near the top surface of the protruding flow path portion on the most downstream side. Item 2. A cooling structure for a molding die according to Item 1.   The cooling structure for a molding die according to claim 1, wherein a baffle plate rising from a bottom surface of the flat flow passage to a vicinity of a top surface is provided in the other protruding flow passage portion over a lateral width. .   A partition plate for blocking the flow of the refrigerant is provided in the flat flow path between the protruding flow path sections, one end is opened near the top surface of the other protruding flow path section, and the other end is a refrigerant supply port. The cooling structure for a molding die according to claim 1, further comprising a suction pipe opened to the partition plate on the downstream side.   The discharge pipe, the baffle plate, and the wall surface near the top surface of each protruding flow path at the end of the suction pipe are formed thick in the protruding flow path in a state where the flow path is narrowed. The cooling structure for a molding die according to claim 1.   The cooling structure for a molding die according to claim 1, wherein a fin is vertically provided on a top surface of the protruding flow path portion.

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