JP6707950B2 - Resin mold - Google Patents

Description

The present invention relates to a resin molding die capable of molding a resin molded product while controlling a temperature by flowing a fluid through a channel formed inside.

2. Description of the Related Art Conventionally, in resin molding such as injection molding, a flow channel is formed inside a mold, and a fluid such as water or oil is caused to flow through the flow channel to cool the mold including a cavity space forming surface. When the cavity space is formed by the cavity portion and the core portion that is received by the cavity portion, the core portion that receives heat input from multiple directions and in which it is difficult to form the cooling flow passage has a higher temperature, and the cavity portion and the core portion are There is a problem that stress is generated due to the temperature difference and the quality of the molded product is adversely affected. As a countermeasure against this, as shown in FIG. 1 of Patent Document 1, there has been proposed one in which a cooling pipe is arranged inside the core portion to allow cooling water to pass therethrough so that the core portion can be cooled. In this document, the inlet and outlet of the flow path are formed on the bottom surface of the mold in which the core is formed.

JP, 2002-210798, A

In Patent Document 1, the length and surface area are substantially the same in the region from the inlet of the flow passage to the core portion and the region from the passage of the core portion to the outlet of the flow passage. There is. For this reason, when a cooling fluid is flown through the flow path, there is a problem in that the fluid receives a large amount of energy from the mold before reaching the core portion, and a sufficient cooling effect cannot be obtained for the core portion.

The present invention has been made in view of the above points, and an object of the present invention is to provide a resin molding die that can efficiently cool a core portion that forms a cavity space.

The resin molding die of the present invention is a resin molding die including a first mold and a second mold that form a cavity space for molding a resin molded product, wherein the first mold has the cavity space. The cavity plate includes a cavity portion having a depressed shape to be formed, and a cavity base portion holding the cavity portion, and the second mold has a protrusion shape to form the cavity space, and the cavity is formed. A core plate that includes a core part that is received by the core part and a core base part that holds the core part, and a flow path through which a temperature adjusting fluid flows is formed in the core plate. An inlet and an outlet are formed in the core base portion, the flow path extends from the inlet to the core portion through the inside of the core base portion, and again extends through the core base portion to the outlet, It is characterized in that the length from the inlet to the core portion is shorter than the length from the core portion to the outlet.

The resin molding die of the present invention is a resin molding die including a first mold and a second mold that form a cavity space for molding a resin molded product, wherein the first mold is the cavity. A cavity plate including a depressed cavity forming a space and a cavity base holding the cavity is provided, and the second mold has a protruding shape forming the cavity. A core plate that includes a core portion that is received in the cavity portion and a core base portion that holds the core portion is provided, and a flow path through which a fluid for temperature adjustment flows is formed in the core plate. An inlet and an outlet of the flow passage are formed in the core base portion, the flow passage extends from the inlet to the core portion through the inside of the core base portion, and again extends through the core base portion to the outlet. The surface area of the flow passage from the inlet to the core portion is smaller than the surface area of the flow passage from the core portion to the outlet.

With this configuration, it is possible to shorten the length from the inlet of the flow path to the core portion or reduce the surface area, and to reduce the amount of energy that the fluid in the flow passage receives from the core base plate before reaching the core portion. By making it small, it is possible to suppress the temperature rise of the fluid. As a result, the temperature of the fluid flowing into the core portion can be kept low, and the core portion can be cooled efficiently.

ADVANTAGE OF THE INVENTION According to this invention, the temperature rise of the fluid before reaching a core part can be suppressed and a core part can be cooled efficiently.

It is a schematic block diagram of the resin molding die which concerns on 1st Embodiment. It is a schematic perspective view of the 2nd type which concerns on 1st Embodiment. It is a front view of the 2nd type which concerns on 1st Embodiment. It is the sectional view on the AA line of FIG. It is a schematic block diagram of the resin molding die which concerns on 2nd Embodiment. It is a front sectional view of a second mold according to the second embodiment. It is explanatory drawing which represented typically the core flow path which concerns on 2nd Embodiment. It is the BB sectional view taken on the line of FIG. It is a schematic block diagram of the resin molding die which concerns on 3rd Embodiment. It is a front cross-sectional view of a second mold according to the third embodiment.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited to the following embodiments, but can be implemented by being modified appropriately within the scope of the invention. In the following figures, a part of the configuration may be omitted for convenience of description. Further, in the following description, unless otherwise specified, “upper”, “lower”, “left”, “right”, “front”, and “rear” are based on the directions indicated by the arrows in each figure. However, the orientation of each configuration in each of the following embodiments is merely an example, and can be changed to any orientation.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of a resin molding die according to the first embodiment. As shown in FIG. 1, a resin molding die (hereinafter, simply referred to as “die”) 10 includes a first die 11 and a second die 12, and a cavity space 13 is formed between them. . One of the first mold 11 and the second mold 12 is a fixed mold and the other is a movable mold and is mounted on an injection molding machine (not shown), and the thermoplastic resin melted from the injection molding machine is placed in the cavity space 13. Injected.

The first mold 11 and the second mold 12 each have a nested structure. The first mold 11 has a cavity plate 17 including a cavity portion 15 having a depressed portion 15a that forms a cavity space 13, and a cavity base portion 16 that receives and holds the cavity portion 15. I have it. The second die 12 includes a core plate 25 including a core portion 21 having a convex portion 20 having a rectangular parallelepiped shape and a core base portion 22 holding the core portion 21. In the state where the first die 11 and the second die 12 are clamped, the convex portion 20 is received by the concave portion 15a, and the cavity space 13 is formed between these relative surfaces.

The shape of the resin molded product molded in the cavity space 13 is a three-dimensional shape such as a box shape or a container shape, and various irregularities are formed as necessary. In the present embodiment, the case where a box-shaped resin molded product having one open surface is molded will be described as an example. In the following description, the flow path 30 (see FIG. 4) formed in the second mold 12, which is a characteristic part of the present invention, and the peripheral structure thereof will be briefly illustrated and described, and other parts will be described. Illustration and description of the structure of the gate, spool, etc. are omitted.

The first mold 11 and the second mold 12 are formed with a flow path through which a fluid (medium) such as hot water for temperature adjustment, steam, oil, or a combination thereof flows. The flow path of the first mold 11 is formed in the cavity base portion 16 so as to pass in the vicinity of the cavity portion 15. However, illustration and description thereof are omitted here, and in the following, it will be a characteristic part of the present invention. The flow path of the second mold 12 formed in the core portion 21 and the core base portion 22 will be described with reference to FIGS. 2 to 4. FIG. 2 is a schematic perspective view of the second mold according to the first embodiment. FIG. 3 is a front view of the second mold according to the first embodiment. FIG. 4 is a cross-sectional view taken along the line AA of FIG.

First, the second mold 12 will be described. As shown in FIGS. 2 and 3, in the second mold 12, a receiving portion 23 having a rectangular shape in a top view is formed so as to recess the upper surface of the core base portion 22. The core portion 21 is provided with a rectangular parallelepiped receiving portion 24 that is continuous with the lower portion of the convex portion 20 and is accommodated in the receiving portion 23. In the state where the received portion 24 is arranged in the receiving portion 23, only the convex portion 20 of the core portion 21 projects from the upper surface of the core base portion 22.

In the present embodiment, the flow passages 30 formed in the core portion 21 and the core base portion 22 of the second mold 12 have a series of inlets 30a and outlets 30b formed on the left side surface of the core base portion 22, respectively. It becomes one continuous flow path. A circulation path (not shown) is connected to the inlet 30a and the outlet 30b, and the fluid pumped to the inlet 30a passes through the flow path 30 and is then collected through the outlet 30b and circulated so as to be pumped to the inlet 30a again. The flow path 30 passes through the inlet 30 a and the core base portion 22 to reach the core portion 21, the upstream side base flow path 31, the core flow passage 32 formed in the core portion 21, and the core base portion 22 again to pass through the outlet. The fluid is flowed in the order of the downstream side base channel 33 extending to 30b. By flowing the fluid through the flow path 30, heat exchange is performed in which the core portion 21 and the core base portion 22 that are in contact with the fluid are cooled. Therefore, the temperature of the core portion 21 and the core base portion 22 can be adjusted during molding before and after filling the cavity space 13 with the molten resin.

As shown in FIGS. 3 and 4, the upstream side base channel 31 has the above-described inlet 30a as the upstream end 31a. The upstream-side base flow path 31 extends straight from the upstream end 31 a to the lower side of the receiving portion 23 in the right direction, and extends straight from the right end side of the linear portion 31 A to the bottom side of the receiving portion 23. The communication portion 31B having an opening is provided, and the fluid flows in the direction indicated by the dotted arrow in FIG. The portion opened to the receiving portion 23 becomes the downstream end 31b of the upstream side base channel 31 and is connected to the core channel 32 formed inside the core portion 21.

The upstream end 32 a of the core channel 32 is formed on the lower surface of the receiving portion 24 so as to communicate with the downstream end 31 b of the upstream base channel 31. A downstream end 32b of the core channel 32 is also formed on the lower surface of the received portion 24, and the downstream end 32b and the upstream end 32a are arranged on the same diagonal line of the received portion 24. As shown in FIG. 2 and FIG. 3, the core flow passage 32 allows the fluid to flow in the order of the upstream core flow passage 32A, the intermediate core flow passage 32B, and the downstream core flow passage 32C. 32 A of upstream core flow paths are extended in the up-down direction linearly from the upstream end 32a to the upper surface vicinity of the core part 21. The intermediate core flow path 32B meanders along the upper surface of the core portion 21 in the vicinity of the upper surface thereof, and in the present embodiment, is formed in a substantially S shape in a top view. The downstream core flow passage 32C extends vertically in a straight line from the vicinity of the upper surface of the core portion 21 to the downstream end 32b formed on the lower surface of the receiving portion 24.

An upstream end 33a of the downstream side base channel 33 (not shown in FIG. 2) opens to the bottom side of the receiving portion 23 and communicates with the downstream end 32b of the core channel 32. As shown in FIGS. 3 and 4, the downstream side base flow path 33 is connected to the communication portion 33A (not shown in FIG. 4) extending downward from the upstream end 33a and the lower end of the communication portion 33A, and is connected in a spiral shape in a top view. And a spiral portion 33B extending to the. The spiral portion 33B is formed at a vertical position different from that of the upstream base flow passage 31, and is formed at a vertical intermediate position of the core base portion 22 below the upstream base flow passage 31. The spiral portion 33B extends in a spiral shape that gradually advances toward the outer peripheral side while surrounding the core portion 21 in a top view, thereby forming a fluid to flow from the upstream end 33a in the order of arrows S01 to S14 in FIG. . Then, the fluid is discharged to the outside of the mold 10 by using the downstream end 33a of the downstream side base channel 33 as the outlet 30b of the channel 30.

Here, in the core portion 21, powder-sintered metal is used as a material, and the powder-sintered layered modeling is repeated by developing the powder-sintered metal on a thin film and then laser-sintering into a cross-sectional shape of the component. The flow path 32 is formed. Examples of the powder sintered metal include iron-based materials, maraging steel, SUS316L and SUS630.

Further, the base flow paths 31 and 33 are formed in the core base portion 22 by forming a plurality of through holes or non-through holes that linearly extend in a front-rear direction, a left-right direction, and a vertical direction by a drill or the like. Specifically, as shown in FIG. 3, the non-through hole 41 extending in the vertical direction is formed from the bottom side of the receiving portion 23 downward to a vertical depth corresponding to each of the communication portions 31B and 33A. Further, as shown in FIG. 4, three non-through holes 42 extending in the front-rear direction are formed from the front surface of the core base portion 22 on both the left and right sides of the receiving portion 23. Further, three through holes 43 extending in the left-right direction are formed on both front and rear sides of the receiving portion 23 so as to penetrate both left and right sides of the core base portion 22. Further, two non-through holes 44 extending in the left-right direction are formed at different heights from the left surface of the core base portion 22 to a position reaching below the receiving portion 23.

Then, in the through-hole 43 and the non-through-holes 41, 42, 44, a closing member 46 indicated by reference numeral 46 in the drawing is provided at an end portion or an intermediate portion thereof. At the installation position of the closing member 46, the flow of the fluid flowing through the flow path 30 is restricted. Therefore, by providing the closing member 46 at each position shown in FIG. 4, it is possible to form the spiral portion 33B in the core base portion 22 in which the fluid flows spirally.

In the flow passage 30, the length of the upstream base flow passage 31 is the length from the inlet 30a (upstream end 31a) to the downstream end 31b that passes through the core base portion 22 and reaches the core portion 21. In addition, the length of the downstream side base flow path 33 is the length until it reaches the outlet 30b (downstream end 32b) through the core base portion 22 on the downstream side from the upstream end 32a. The length of the upstream side base flow path 31 is formed shorter than the length of the downstream side base flow path 33, and in the present embodiment, the ratio is 6% in percentage. This percentage is less than 50% even if the shape or size of the resin molded product to be molded changes, but is preferably set to 40% or less, more preferably 20% or less.

According to the first embodiment as described above, since the upstream side base flow path 31 is formed shorter than the downstream side base flow path 33, the heat absorption amount of the core base portion 22 due to the fluid flowing through the upstream side base flow path 31. Can be made smaller. Therefore, the temperature rise of the fluid before reaching the core portion 21 can be suppressed, and the temperature of the fluid flowing in the core passage 32 can be lowered to efficiently cool the core portion 21. In addition, since the length of the downstream side base flow path 33 can be increased, the cooling effect of the core base portion 22 can be favorably maintained.

Furthermore, since the meandering intermediate core flow path 32B is formed at a position along the upper surface of the core portion 21 (projection portion 20) which is the formation surface of the cavity space 13 (see FIG. 1), the upper surface is efficiently cooled over a wide range. can do. As a result, in the resin molded product that has been solidified by cooling, it is possible to improve the dimensional accuracy at the position corresponding to the upper surface of the core portion 21 and improve the appearance quality. The meandering shape of the intermediate core flow path 32B is not limited to the illustrated configuration example, and may be any flow path shape that makes at least one reciprocation, such as increasing or decreasing the number of meandering times. Further, the formation position of the intermediate core flow path 32B is not limited to the upper surface of the convex portion 20, and may be changed or added to another forming surface of the convex portion 20 according to the exposed surface of the resin molded product or the like. ..

Next, another embodiment of the present invention will be described. In the following description, the same reference numerals may be used for the same or equivalent components as those in the embodiments described before, and the description may be omitted or simplified.

[Second Embodiment]
FIG. 5 is a schematic perspective view of a second mold according to the second embodiment, and FIG. 6 is a front cross-sectional view of the second mold according to the second embodiment. FIG. 7: is explanatory drawing which represented the core flow path which concerns on 2nd Embodiment typically. FIG. 8 is a sectional view taken along line BB of FIG. As shown in FIG. 5, the core flow path 52 in the core portion 21 of the second embodiment is formed so that the fluid flows along the upper surface, the left and right surfaces, and the front and rear surfaces of the convex portion 20. As shown in FIG. 6, in the core flow channel 52, the upstream end 52a is formed in the central portion of the lower surface of the received portion 24, and the upstream base flow channel 31 and its downstream end 31b are also in a position communicating with the upstream end 52a. It is formed. The core flow path 52 allows the fluid to flow in the order of the upstream core flow path 52A, the intermediate core flow path 52B, and the downstream core flow path 52C.

The upstream core flow path 52A extends from the upstream end 52a to the vertical middle portion of the convex portion 20, and then extends upward while branching in the left-right direction and the front-back direction that is the direction orthogonal to the paper surface of FIG. As shown in FIGS. 7 and 8, the intermediate core flow path 52B is further branched along the upper surface of the convex portion 20 and extends in the radial direction in a top view. Bends along and extends downward. Therefore, at the positions along the front and rear surfaces and the left and right surfaces of the convex portion 20, the flow paths are arranged at predetermined intervals. The downstream core flow passage 35C includes a flow passage 35Ca that is continuous with the lower ends of the plurality of branched intermediate core flow passages 52B and forms a loop, and the flow passage 35Ca and the downstream end 52b formed on the lower surface of the receiving portion 24. And a flow path 35Cb (not shown in FIG. 7) extending between the two. In the downstream core flow passage 35C, the fluid flows from the loop-shaped flow passage 35Ca to the flow passage 35Cb, and then flows into the downstream base flow passage 33.

Also in the second embodiment, the downstream side base channel 33 is formed similarly to the first embodiment, and the length of the upstream side base channel 31 is shorter than the length of the downstream side base channel 33. To be done.

According to the second embodiment as described above, since the core flow path 52 is formed along the upper surface, the front-rear surface, and the left-right surface of the convex portion 20 serving as the formation surface of the cavity space 13 (see FIG. 1), These surfaces can be cooled efficiently. Further, since the upstream core flow channel 52A is located at or near the center of the convex portion 20 in a top view and the intermediate core flow channel 52B branches outward from that position, the intermediate core flow channel 52B is convex. It is possible to make the cooling effect uniform by the fluid flowing to the front and rear sides and the left and right sides of the portion 20.

In the upstream core flow channel 52A, the intermediate core flow channel 52B, and the downstream core flow channel 52C, the cross-sectional area orthogonal to the fluid flow direction is made uniform at any position in the flow direction, so that the core flow The pressure loss of the fluid flowing through the passage 52 can be suppressed.

[Third Embodiment]
FIG. 9 is a schematic perspective view of the second mold according to the third embodiment, and FIG. 10 is a front cross-sectional view of the second mold according to the third embodiment. As shown in FIGS. 9 and 10, the core flow path 62 in the core portion 21 of the third embodiment has non-through holes 62A formed at two positions on the left and right of the core portion 21, and the respective non-through holes. It is formed by a baffle plate 62B inserted in 62A. The baffle plate 62B partitions the inside of the non-through hole 62A into right and left parts, and the front and rear end surfaces thereof are provided so as to contact the inner surface of the non-through hole 62A. The tip (upper end) of the baffle 62B is provided in a shape cut out in a semicircular arc shape, and a space through which the fluid flows is provided between the baffle 62B and the bottom (upper end) of the non-through hole 62A. Therefore, in the core flow path 62, the fluid flowing from the lower right side of the lower end of the non-through hole 62A rises inside the non-through hole 62A and then rises above the non-through hole 62A as indicated by the dotted arrow in FIG. It will turn back and flow downward. Therefore, in the core flow path 62, the opening at the lower part of the non-through hole 62A serves as the upstream end and the downstream end, and in the present embodiment, the non-through hole 62A and the baffle plate 62B are provided at two locations, so that the above-described fluid flow is achieved. Are formed at two locations.

In the third embodiment, the upstream end 61 a of the upstream base flow path 61, which is the inlet 30 a of the flow path 30, is formed on the right side surface of the core base portion 22. The upstream side base flow path 61 communicates with a straight line portion 61A that linearly extends in the left direction so as to pass below the receiving portion 23 from the upstream end 61a, and extends upward from the straight line portion 31A to the non-through hole 62A. It is provided with two first communication portions 61B and a second communication portion 61C that extends downward from the left end side of the linear portion 31A and that communicates with the downstream side base flow path 33. Even in the first communication portion 61B, the inside is partitioned left and right by the baffle plate 62B in the same manner as the non-through hole 62A. Therefore, in the upstream side base channel 61, the fluid that has reached the baffle plate 62B can be caused to flow into the core channel 62.

Here, a holder 70 that holds the baffle plate 62B is provided at the base of the baffle plate 62B. The holding body 70 fits into the upper part of the non-through hole 72 formed from the lower surface side of the core base portion 22 to position the holding body 70, while preventing the fluid in the upstream side base channel 61 from leaking to the outside. Regulated. The second communicating portion 61C is formed by a non-through hole 73 formed so as to reach the straight portion 61A from the lower surface side of the core base portion 22, and is closed by the closing member 46 at a position below the downstream side base flow passage 33. To be done.

Also in the third embodiment, the downstream side base flow path 33 is formed similarly to the first embodiment. Therefore, the upstream base flow path 61, which is the upstream side of the core flow path 62, can be formed shorter than the downstream base flow path 33, and the fluid flowing in the core flow path 62 can be formed in the same manner as in the first embodiment. It is possible to cool the core portion 21 efficiently by lowering the temperature.

The present invention is not limited to the above embodiment and can be implemented with various modifications. The numerical values, dimensions, materials, and directions described in the above embodiment are not particularly limited. Other changes can be made without departing from the scope of the object of the present invention.

For example, in each of the above embodiments, the case where the lengths of the upstream side base flow paths 31 and 61 are formed to be shorter than the length of the downstream side base flow path 33 has been described. The surface areas of the side base channels 31 and 61 may be smaller than the surface area of the downstream side base channel 33. For example, in the first embodiment, the ratio is 6% in percentage. This percentage is less than 50% even if the shape or size of the resin molded product to be molded changes, but is preferably set to 40% or less, more preferably 20% or less. Also by this, the temperature rise of the fluid before reaching the core portion 21 can be suppressed, the temperature of the fluid flowing through the core flow paths 32, 52, 62 can be lowered, and the core portion 21 can be efficiently cooled. As a specific example, the upstream side base channels 31, 61 have a circular cross section, and the downstream side base channel 33 has an elliptical or rectangular cross section. It is possible to improve the cooling efficiency by changing the, regardless of the length of the flow path and minimizing the influence on the flow rate and the flow velocity. The average surface area per unit length is set so as to fall within the range described above as the ratio of the total surface area of the upstream base flow paths 31 and 61 to the total surface area of the downstream base flow path 33. Here, the “average surface area per unit length” is S/L, where L is the total length of the target channel and S is the area (surface area) of the inner peripheral surface of the entire target channel. Become.

Further, the flow path length of the upstream side base flow paths 31, 61 is set shorter than the flow path length of the downstream side base flow path 33, and the average surface area per unit length of the upstream side base flow paths 31, 61 is set to the downstream side. It may be smaller than the average surface area per unit length of the side base channel 33. Thereby, the temperature of the fluid flowing in the core portion 21 can be lowered more efficiently.

In addition, the meandering flow path shape of the intermediate core flow path 32B may be changed as long as it has a shape that increases the flow path length along the formation surface of the cavity space 13 in the core portion 21, such as a spiral shape. In addition, one core portion 21 may be a core flow path that includes both a flow path that meanders as described above and a flow path that branches into a plurality of paths.

Further, the formation positions of the inlet 30a and the outlet 30b of the flow path 30 are not limited to the above-mentioned positions, and may be changed to other positions of the core base portion 22.

Further, in each of the above embodiments, the thermoplastic resin is used as the filling resin, but a thermosetting resin may be used. In this case, the molten resin filled in the cavity space 13 is solidified by being heated by the fluid flowing in the flow path 30.

Although injection molding is used in the above-mentioned embodiment, molding may be performed by transfer molding, compression molding, or cast molding.

Further, the tip of the baffle plate 62B is not limited to the concave shape as described above, and various modifications such as a flat surface can be made.

The layout of the downstream side base channel 33 is not limited to the illustrated example including the spiral portion 33B, and various modifications can be made according to the shape of the core base portion 22, the arrangement of the core portion 21, the cooling effect, and the like. is there. Further, although illustration and description are omitted, a flow path having a shape similar to the downstream side base flow path 33 may be formed around the cavity portion 15 of the first mold 11.

Further, the cavity portion 15 and the cavity base portion 16, the core portion 21 and the core base portion 22 may have a structure in which they are connected in series and integrated without forming a nested structure. In this case, the portion protruding from the upper end surface of the core base portion 22 becomes the core portion 21.

10 mold (resin molding mold)
11 1st type|mold 12 2nd type|mold 13 Cavity space 15 Cavity part 16 Cavity base part 17 Cavity plate 21 Core part 22 Core base part 25 Core plate 30 Flow path 30a Inlet 30b Outlet

Claims (6)

A resin molding die including a first mold and a second mold for forming a cavity space for molding a resin molded product,
The first mold includes a cavity plate including a depressed cavity portion that forms the cavity space, and a cavity base portion that holds the cavity portion.
The second mold includes a core plate including a core portion having a protruding shape that forms the cavity space and received by the cavity portion, and a core base portion that holds the core portion.
The core plate is formed with a flow path through which a fluid for temperature adjustment flows, and an inlet and an outlet of the flow path are formed in the core base portion,
The flow passage extends from the inlet through the core base portion to the core portion, again extends through the core base portion to the outlet, and has a length from the inlet to the core portion. A resin molding die, which is formed to be shorter than the length from the core portion to the outlet. A resin molding die including a first mold and a second mold for forming a cavity space for molding a resin molded product,
The first mold includes a cavity plate including a depressed cavity portion that forms the cavity space, and a cavity base portion that holds the cavity portion.
The second mold includes a core plate including a core portion having a protruding shape that forms the cavity space and received by the cavity portion, and a core base portion that holds the core portion.
The core plate is formed with a flow path through which a fluid for temperature adjustment flows, and an inlet and an outlet of the flow path are formed in the core base portion,
The flow passage reaches the core portion through the inside of the core base portion from the inlet, extends again to the outlet through the inside of the core base portion, and reaches the core portion of the flow passage. A resin molding die, wherein the surface area is formed smaller than the surface area of the flow path from the core portion to the outlet. The flow path has an average surface area per unit length from the inlet to the core portion smaller than an average surface area per unit length in the core portion. The resin molding die described. The said flow path is provided with the part meandering along the formation surface of the said cavity space in the said core part, The resin molding die of any one of the Claims 1-3 characterized by the above-mentioned. .. The resin molding die according to any one of claims 1 to 4, wherein the flow passage includes a portion that is branched into a plurality of portions in the core portion. The flow path includes a part that branches into a plurality of parts in the core part,
The resin molding die according to claim 4 , wherein the branched portion of the flow path is formed near the center of the forming surface.

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