JP2018001662A - Cooling structure of molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a molding die, in a flow passage part formed so as to be risen to the upper part along a molded part, and in which the upper top face is closed, preventing the phenomenon that a coolant fed to a cooling flow passage passes through the lower part of the flow passage part, and also, evading the state that the progressed coolant stagnates to retain.SOLUTION: A flat flow passage 3 through which a coolant provided in a molding die flows and projection flow passage parts 5A, 5B to the upper part guiding the coolant along a cooling objective face in a molding die 1 from the lat flow passage 3 are formed. The upstream side of the flat flow passage 3 is provided with a coolant feed port 31, and the downstream side is clogged. One edge port is opened 61 in the vicinity of the top face of the projection flow passage part 5B on the lowermost stream side, and the other edge port 62 is made into a coolant exhaust port and is provided with an exhaust pipe 6 opened to the outside of the die. Further, the other projection flow passage part 5A is disposed with a baffle 7 stood from the bottom face of the flat flow passage 3 to the vicinity of the top face over the horizontal width.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cooling structure in various molding dies such as a vacuum molding die provided with a flow path provided in a molding die and through which a refrigerant flows.

In order to mold a molded product such as a synthetic resin, there are various molding methods using a mold.
For example, a molding die used in an injection molding machine has a fixed side and a movable side, and an uneven shape is formed at the center of the abutting surface of the fixed side and movable side molds facing each other. Then, the molded product is obtained by filling the space formed by the abutment with a molten resin.
Then, in order to lower the temperature quickly after molding and increase the efficiency of the operation cycle of injection molding, the mold is forcibly heated and cooled.

Other methods include vacuum forming and pressure forming.
This is a molding method in which a plastic sheet heated and softened is stretched and adhered to 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 (reduced pressure), The sheet is brought into close contact with a molding die to obtain a predetermined shape, and after cooling, it is released from the mold and taken out.

Unlike injection molding or the like, vacuum forming or pressure forming has an advantage that it is sufficient to use only a convex mold or a concave mold.
However, in any molding method, 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 a cooling flow path for cooling is provided in the molding die, the cooling flow path is formed along the uneven surface of the molded product to be cooled to improve cooling efficiency and be as uniform as possible throughout the molded product. It is preferable to achieve proper cooling.

  However, even if the cooling flow path is formed in the mold by simply projecting the cooling flow path upward along the protruding part of the uneven surface of the molded product, the upper ceiling of the protruding flow path part is formed. Since the surface is closed, the refrigerant supplied to the cooling channel does not circulate even if it passes through the lower part of the protruding channel part or even if a part of the refrigerant enters the protruding channel part. In this state, the molded product cannot be sufficiently cooled.

Therefore, a flow path control structure is required 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 again.
Japanese Patent Laid-Open No. 2002-210798 discloses a flow path control structure in which a cooling pipe is disposed in a protruding (branch) flow path, and Japanese Patent Laid-Open No. 2003-305725 discloses a partition plate in a protruding (branch) branch flow path. A flow path control structure for disposing the above is disclosed.

Japanese Patent Laid-Open No. 2002-210798 JP 2003-305725 A

  In view of the above problems, the present invention is formed by raising upward along a molded product, and in the flow path portion where the upper top surface is closed, the refrigerant supplied to the cooling flow path is the flow path portion. It is intended to provide a cooling structure for the molding die that prevents the passage of the lower part of the mold and prevents the refrigerant that has entered from stagnating and accumulating.

  According to the first aspect of the cooling structure of the molding die according to the present invention, there is provided a flat flow path through which a refrigerant provided in the molding mold flows, and a surface to be cooled in the molding mold from the flat flow path. An upward projecting flow channel portion for guiding the refrigerant is provided, a refrigerant supply port is provided on the upstream side of the flat flow channel, the downstream side is closed, and is located near the top surface of the projecting flow channel portion on the most downstream side. An end port is opened, and the other end port serves as a coolant discharge port, and includes a discharge pipe that is opened outside the mold.

  According to a second aspect of the present invention, there is provided a cooling structure for the molding die according to the first aspect, wherein the other of the cooling pipes is more than the other end of the discharge pipe opened near the top surface of the projecting flow path portion on the most downstream side. The top and bottom positions of the top surface of the protruding flow path portion are formed low.

  According to a third aspect of the invention of the cooling structure of the molding die, in the invention according to the first or second aspect, the baffle plate that stands up from the bottom surface of the flat flow channel to the vicinity of the top surface is provided on the other projecting flow channel portion. It is characterized by being provided over.

  According to a fourth aspect of the invention of the cooling structure of the molding die, in the invention according to the first or second aspect, a partition plate for blocking the flow of the refrigerant is provided in the flat flow path between the protruding flow path portions. The other projecting flow path portion is provided with a suction pipe having one end opening in the vicinity of the top surface and the other end opening serving as a refrigerant supply port and opened to the partition plate on the downstream side. It is.

  According to a fifth aspect of the invention of the cooling structure of the molding die, in the first to fourth aspects of the invention, the vicinity of the top surface of each protruding flow path portion at the tip of the discharge pipe, the baffle plate, and the suction pipe The wall surface is formed thick in the protruding flow path so that the flow path is narrowed.

  A sixth aspect of the invention of the cooling structure of the molding die according to the first to fifth aspects of the present invention is characterized in that fins are suspended from the top surface of the protruding flow path portion.

The invention according to claim 1 of the cooling structure of the molding die according to the present invention is provided with a refrigerant supply port on the upstream side of the flat flow path through which the refrigerant provided in the molding die flows, and the downstream side is closed. The refrigerant supplied from the refrigerant supply port does not have an outlet in the flat water channel, and fills up to the upward projecting flow channel portion that guides the refrigerant along the cooling target from the flat flow channel.
Then, it flows out of the mold from the refrigerant discharge port at the other end opened from the one end of the discharge pipe opened near the top surface of the projecting flow path portion on the most downstream side.
Therefore, not only the flat water channel but also the protruding flow path portion formed along the molded product to be cooled can be reliably filled with the refrigerant, and the effect of enhancing the cooling action of the molded product is exhibited.

  In addition to the effect described in claim 1, the invention of claim 2 is characterized in that the other projecting flow channel portion is more than the one end port of the discharge pipe opened near the top surface of the projecting flow channel portion on the most downstream side. Since the top and bottom positions of the top surface are formed low, the other projecting flow path portions are reliably filled with the refrigerant up to the top surface and have the effect of obtaining the expected cooling action.

In addition to the effect of claim 1 or 2, the invention of the cooling structure of the molding die according to claim 3 is a baffle plate that stands up from the bottom surface of the flat channel to the vicinity of the top surface in the other projecting channel part. Therefore, the refrigerant is guided from the flat water channel to the baffle plate, rises up the protruding flow channel portion, fills the upstream protruding flow channel portion, passes over the baffle plate, and flows downstream. Down the section and return to the flat waterway.
Further, since the same flow is repeated also in the downstream projecting flow channel portion, the refrigerant supplied to the cooling flow channel is prevented from passing through the flat flow channel below the other projecting flow channel portion and entered. The effect which avoids the state which the collected refrigerant stagnates and accumulates is exhibited.

  In addition to the effect of claim 1 or 2, the invention for the cooling structure of the molding die according to claim 4 is provided with a partition plate for blocking the flow of the refrigerant in the flat flow path between the protruding flow path portions. Each of the projecting flow passage portions is provided with a suction pipe having one end opening in the vicinity of the top surface of the other projecting flow passage portion and the other end opening serving as a refrigerant supply port and opened to the partition plate on the downstream side. The flow path part and the flat flow path below it are spaces partitioned by a partition plate, and supply and discharge of the refrigerant is performed by the suction pipe, and the discharge is a part of the suction pipe opened near the top surface of the protruding flow path part. Since it is made from the end port, each projecting flow channel portion is filled with the refrigerant up to the top surface and has the effect of obtaining the expected cooling action without stagnating.

  In addition to the effects of claims 1 to 4, the invention of the cooling structure for the molding die according to claim 5 is characterized in that the top of each protruding flow path portion at the tip of the discharge pipe, the baffle plate, and the suction pipe. Since the wall surface near the surface is formed thick into the protruding flow channel so that the flow channel is narrowed, the flow channel near the top surface is narrowed to prevent the refrigerant from stagnation and collecting. The wall surface portion that may not come into contact is further narrowed, and the effect of expecting smooth circulation and cooling of the refrigerant is exhibited.

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

It is a longitudinal cross-sectional view of the molding die which shows one embodiment of this invention. It is a longitudinal cross-sectional view of the molding die which shows other embodiment of this invention. It is a longitudinal cross-sectional view of the molding die which shows other embodiment of this invention. It is a longitudinal cross-sectional view of the molding die which shows other embodiment of this invention. It is a partial longitudinal cross-sectional view of the shaping die which shows other embodiment of this invention. It is a partial longitudinal cross-sectional view of the shaping die which shows other embodiment of this invention.

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

The molding die 1 is installed in a horizontal state as a molding die in a vacuum molding machine, and obtains a molded product by molding and solidifying a molding material using an uneven portion on an upper surface.
A space is formed inside the molding die 1, the space is formed along the outer surface contour of the molding die 1, leaving 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 where the refrigerant circulates, a flat flow path 3 is formed in the substrate part 2, and the convex part 4 is guided upward from the flat flow path 3 along the surface to be cooled in the molding die 1. 5A is formed, and a refrigerant supply port 31 is provided on the upstream side of the flat flow path 3.
The space on the downstream side of the flat flow path 3 is closed, and the discharge pipe 6 is installed in the projecting flow path portion 5B on the most downstream side, and the upstanding one end 61 opens near the top surface, The other end port 62 that is bent and extends in the lateral direction of the flat flow path 3 serves as a refrigerant discharge port and opens outside the template 1.

Therefore, the refrigerant supplied from the refrigerant supply port 31 does not have an outlet in the flat water channel 3 and fills up to the upward projecting flow channel portions 5A and 5B that guide the refrigerant from the flat flow channel 3 along the cooling target. From the one end 61 of the discharge pipe 6 opened near the top surface of the protruding flow channel part 5B on the side, the refrigerant flows out of the template 1 through the refrigerant outlet of the other end 62 opened outside the mold 1.
Therefore, not only the flat water channel 3 but also the projecting flow channel 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 fixed-side molding die 1 showing another embodiment.
The top and bottom positions of the top surfaces of the other projecting flow channel portions 5A are formed lower than the one end 61 of the discharge pipe 6 opened near the top surface of the projecting flow channel portion 5B on the most downstream side.
Therefore, the other protruding flow path portion 5A can be reliably filled with the refrigerant up to the top surface and obtain the expected cooling action.

FIG. 3 is a longitudinal sectional view of the fixed-side molding die 1 showing another embodiment. The baffle plate 7 stands up from the bottom surface of the flat flow channel 3 to the vicinity of the top surface in the other protruding flow channel portion 5A. Is formed across the width.
Accordingly, the refrigerant is guided from the flat water channel 3 to the baffle plate 7 and rises up the protruding flow path portion 5A to fill the upstream-side protruding flow path portion 5A, and the refrigerant that has overflowed over the baffle plate 7 flows downstream. The flow 5A flows down and returns to the flat water channel 3, and the same flow is repeated in the protruding flow channel 5A on the downstream side.

  In this way, the refrigerant supplied to the cooling flow path is prevented from passing through the flat flow path below the other protruding flow path portion 5A, and the action of avoiding the state where the entered refrigerant stagnates and accumulates is prevented. Play.

FIG. 4 is a longitudinal sectional view of the fixed-side molding die 1 showing another embodiment, and a flat flow path 3 between the protruding flow path portions 5A and between the protruding flow path portions 5A and the protruding flow path portions 5B. In addition, a partition plate 8 for blocking the flow of the refrigerant is provided.
Each of the other projecting flow channel portions 5A is provided with a suction pipe 9, and one of the upstanding end ports 91 opens near the top surface, bends and extends in the lateral direction of the flat flow channel 3. The other end 92 is a refrigerant outlet and opens to the partition plate 8 on the downstream side.

  Therefore, each of the protruding flow path portions 5A and 5B and the flat flow path 3 therebelow is a space partitioned by the partition plate 8, and supply and discharge of the refrigerant is performed by the suction pipe 9, and discharge is performed in the protruding flow path portions 5A and 5A. Since the suction pipe 9 opened in the vicinity of the top surface of 5B and the one end ports 91 and 61 of the discharge pipe 6 are made, each of the projecting flow channel portions 5A and 5B is filled with the refrigerant up to the top surface and accumulates. The expected cooling action can be obtained without any problems.

FIG. 5 is a partial vertical cross-sectional view of the fixed-side molding die 1 showing another embodiment, and the protruding flow path portion at the tip of the discharge pipe 6, the suction pipe 9 and the baffle plate 7. The wall surfaces in the vicinity of the top surfaces of 5A and 5B are formed into the protruding flow channel portions 5A and 5B with a thickness 51, and the flow channels are narrowed.
Therefore, the flow path in the vicinity of the top surface where the refrigerant may stagnate and accumulate or the portion where the refrigerant does not come into contact with the wall surface is narrowed, and a smoother circulation and cooling action of the refrigerant 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 projecting flow channel portions 5A and 5B, and contact the refrigerant. The cooling from the fin 10 is conducted to the top surface.
Cooling from the fins 10 enhances the cooling of the top surface, and can supplement the cooling action even if the top surface interferes with the refrigerant.

By the way, as the discharge pipe 6, the suction pipe 9, and the baffle plate 7 are arranged so that the tips of the discharge pipe 6, the suction pipe 9 and the top surface of the projecting flow path portions 5A and 5B are located closer to each other, the possibility that the refrigerant stagnates or accumulates. The part which does not contact can be reduced.
However, in order to guarantee the progress of the refrigerant, the one end opening 91 of the suction pipe 9 and the front end of the baffle plate 7 are placed at the same position as the one end opening 61 of the discharge pipe 6 and set below that. It is preferable to do this.

In addition, since the space on the downstream side of the flat flow path 3 is blocked, a small hole 11 for drainage is provided on the downstream side wall surface of the molding die 1 and a stopper 12 is detachably attached. When cleaning up when not in use, the refrigerant remaining in the space can be discharged, and similarly, the drain plate pores 13 that do not affect the filling of the refrigerant are provided at the bases of the partition plate 8 and the baffle plate 7 as well. It is preferable.
Furthermore, in the production of the molding die of the present invention, the configuration is more complicated and finer than in the past, but it can be formed by using, for example, a 3D printer.

  As mentioned above, the mold used in the vacuum molding machine has been described as an example of the embodiment of the present invention. However, the present invention is not limited to the above-described embodiment, and of course, the mold of the molding machine of another method is also used. The present invention extends widely to the entire scope of the technical idea that the present invention is truly intended to be apparent from the matters described in the present specification and drawings.

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

Claims (6)

  A flat flow path through which the refrigerant provided in the molding die flows, and an upward 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 port is opened near the top surface of the projecting flow channel portion on the most downstream side, and the other end port serves as a refrigerant discharge port outside the mold. A cooling structure for a molding die, characterized by comprising an open discharge pipe.   The top and bottom positions of the top surfaces of the other projecting flow channel portions are formed lower than one end of the discharge pipe opened near the top surface of the projecting flow channel 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 or 2, wherein a baffle plate standing from the bottom surface of the flat flow channel to the vicinity of the top surface is provided across the lateral width in the other protruding flow channel part. .   A partition plate for blocking the flow of the refrigerant is provided in the flat flow path between the protruding flow path portions, one end opening is opened near the top surface of the other protruding flow path portion, and the other end port is a refrigerant supply port. The cooling structure for a molding die according to claim 1 or 2, further comprising a suction pipe opened in the partition plate on the downstream side.   The wall surface near the top surface of each protruding flow path portion at the tip of the discharge pipe, the baffle plate, and the suction pipe is formed thick in the protruding flow path so that 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 fins are suspended from the top surface of the protruding flow path portion.

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