JP2018192508A - Mold - Google Patents

Abstract

To provide a mold having cooling passages where the capacity of cooling a molten substance in a cavity is improved, and cooling time is reduced, compared with the conventional cooling passages.SOLUTION: There is provided a mold 1 formed with cooling passages 5A to 5F through which a cooling medium is circulated in the vicinity of a cavity 4, in which the cooling passages 5A to 5F include: a main passage 6 extended in a first direction along the cavity 4 in a state where spacing is held with the cavity 4; a first flat passage 7 extended along the cavity 4 in a second direction crossed with the first direction jutted from the main passage 6; and a second flat passage 8 shorter than the first flat passage 7 extended in the second direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mold in which a cooling passage is formed.

  A molded article formed by a mold is manufactured by introducing a molten substance (for example, molten metal) into a mold cavity and solidifying the molten substance by cooling in the cavity. Therefore, conventionally, a cooling passage is formed around the cavity of the mold in order to promote cooling. Patent Document 1 is given as an example of a mold in which such a cooling passage is formed. In Patent Document 1, a substantially cylindrical cooling hole 20 is formed in the mold 2, and cooling water is introduced from the water flow device 10 through a water flow pipe 12 inserted into the cooling hole 20.

JP2015-39702A

  The shorter the cooling time, the shorter the time until the molded product is removed from the mold, which is advantageous. However, conventionally, the cooling passage has a substantially cylindrical shape like the cooling hole 20 of Patent Document 1. For this reason, in order to rapidly cool, a plurality of cooling passages have to be formed at narrow intervals. In order to introduce cooling water into each cooling passage, it is usually necessary to provide a valve device, which increases the installation cost. In addition, as the number of valve devices increases, a system for supplying and draining water to the valve devices, setting of the control thereof, and labor for maintenance increase, and this also increases costs.

In order to achieve the above object, as means 1, in a mold having a cavity in the shape of a molded product and having a cooling passage through which a cooling medium flows in the vicinity of the cavity, the cooling passage maintains a distance from the cavity. In this state, the first flat portion extends in the first direction along the cavity, and has a first flat portion along the cavity in the second direction intersecting the first direction.
As a result, the cooling area for cooling a cavity by one cooling passage is increased. Therefore, compared with the conventional cooling passage, the ability to cool the molten material in the cavity is improved, and the cooling time is shortened. In addition, since the cooling capacity is improved without increasing the number of systems for introducing or deriving the cooling medium into the mold, the cost of the system for introducing or deriving the cooling medium into the mold is increased or the control mechanism is complicated. There is nothing to do.
The “first flat portion” extends in a protruding manner along the cavity.
“Mold” includes both closed and open molds. In particular, the present invention is preferably applied to a sealed type. Further, the molten substance for producing the molded product may be a molten metal (molten metal, yoyo) or a molten plastic. Examples of the molten metal include an aluminum alloy, a zinc alloy, and a die cast alloy. When the mold is a die-cast mold, for example, it is generally composed of a fixed mold and a movable mold, and a cavity is formed inside by combining both molds. Die-casting dies often adopt a nested structure in which the cavity is not carved directly into the die, but is engraved into a small special steel material and fitted into the mother die (mainly). You may make it arrange | position a cooling channel | path around the cavity of such a nested structure.
Examples of the “cooling medium” include water and flame-retardant oil if it is liquid. These definitions also apply to the following means.
The cooling passage is preferably formed in the steel material by, for example, cutting or electric discharge machining. In particular, in electric discharge machining, wire cutting is possible when the cooling passage is linearly removed before and after the mold. If the cross-sectional shape is not linear but refracts in the middle, half of the cooling passages are recessed in the two metal block surfaces, respectively, and heat resistant adhesive (for example, water glass) on the two metal block surfaces is used. A die having a cooling passage may be formed with the concave portions facing each other by bonding.
“Along the cavity” does not mean that the distance between the cooling passage and the entire length of the cooling passage must be strictly constant. The distance from the cavity does not always have to be constant along the longitudinal direction as long as it is necessary to cool the inside of the cavity and maintain the strength of the mold. It is only necessary that the cooling passage extends in the vicinity of the cavity while maintaining a distance from the surface constituting the cavity. However, in order to cool the inside of the cavity evenly, it is preferable that the entire length in the longitudinal direction is constant, and it is preferable that there are more portions that are not constant than the portions that are not constant.

Further, as means 2, the cooling passage has a main passage and the first flat portion having a narrower width than the main passage.
As a result, the cooling medium introduced at the same pressure in the first flat portion has a cross-sectional area relatively smaller than that of the main passage in the first flat portion narrower than the main passage, so that the flow velocity in this portion increases. Thus, since the cooling medium is quickly replaced, the cooling effect in such a portion is increased.
Further, as the means 3, the first flat portion is arranged so as to project at an equal distance on both sides of the main passage.
Thereby, the cavity can be cooled with a good balance around the main passage.

Further, as the means 4, in a mold having a cavity in the shape of a molded product and having a cooling passage through which a cooling medium flows in the vicinity of the cavity, the cooling passage is placed in the cavity while maintaining a space from the cavity. And a first flat portion extending along the cavity in a second direction intersecting the first direction and separated from the main passage by a partition wall. The main passage and the first flat portion communicate with each other through a through hole formed in a part of the partition wall.
As a result, the cooling area for cooling a cavity by one cooling passage is increased. Therefore, compared with the conventional cooling passage, the ability to cool the molten material in the cavity is improved, and the cooling time is shortened. In addition, since the cooling capacity is improved without increasing the number of systems for introducing or deriving the cooling medium into the mold, the cost of the system for introducing or deriving the cooling medium into the mold is increased or the control mechanism is complicated. There is nothing to do.
Further, as the means 5, the first flat portion is narrower than the main passage.
As a result, the cooling medium introduced at the same pressure in the first flat portion has a cross-sectional area relatively smaller than that of the main passage in the first flat portion narrower than the main passage, so that the flow velocity in this portion increases. Thus, since the cooling medium is quickly replaced, the cooling effect in such a portion is increased.

Further, as the means 6, the cooling passage has one or a plurality of second flat portions extending in the second direction around the main passage and not along the cavity. did.
As a result, the area where the cooling medium comes into contact with the mold increases, and the cooling ability is further improved. The second flat portion is extended in a direction protruding not along the cavity. The plurality of second flat portions may be formed at equal angles around the axis in the first direction, and non-uniform angles may be used to improve cooling efficiency depending on the thickness of the mold and the shape of the cavity. May be formed. In that case, the length of each second flat portion may not be uniform.
Further, as the means 7, the amount of the second flat portion is smaller than that of the first flat portion. This is because if the amount of overhang of the second flat portion is too large, the strength of the mold is affected.
Further, as the means 8, a plurality of the cooling passages are arranged along the cavity. By providing a plurality of cooling passages along the cavity, the periphery of the cavity can be uniformly cooled.

  As a result, the ability to cool the molten material in the cavity is improved as compared with the conventional cooling passage, and the cooling time is shortened.

It is a metal mold | die of Embodiment 1 of this invention, Comprising: The end elevation in the AA line of FIG. It is the metal mold | die of the same Embodiment 1, Comprising: The end elevation in the BB line of FIG. The top view of the metal mold | die of Embodiment 1. FIG. (A) is the side view which showed the O-ring position with the virtual line before attaching the cooling water supply apparatus or cooling water discharge apparatus of the metal mold | die of 1 of Embodiment, (b) is a cooling water supply apparatus similarly Or the side view of the state which attached the cooling water discharge device. The perspective view of the molded article manufactured with the metal mold | die of Embodiment 1 and 2. FIG. FIG. 6 is an end view for explaining a cooling passage of a mold according to a second embodiment. Sectional drawing for demonstrating the cooling water supply / discharge device of the metal mold | die of Embodiment 2. FIG.

Hereinafter, a mold according to an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 to 3 show an example of a die casting mold 1. The die casting mold 1 includes a movable die 2 and a fixed die 3, and a cavity 4 is formed in a state where opposed surfaces of the movable die 2 and the fixed die 3 are combined. In the first embodiment, the shape of the cavity 4 is a plate-like space that is curved so that the center of the fixed die 3 is recessed on the line AA in FIG. It is said that. With this die-casting die 1, a plate-shaped die-cast alloy product S having a flat center portion as shown in FIG. The product S has a linear shape in the X direction, and a three-dimensional shape in which a curved portion is formed by a quadratic curve in the Y direction orthogonal to the X direction.
Actually, the movable die 2 and the fixed die 3 are respectively held by the holders, but are not shown in the present embodiment. Further, a press pin for taking out a molded product that has been molded is provided in the cavity 4, but this is also not shown.
In the movable die 2 and the fixed die 3, a plurality of cooling passages 5 through which cooling water passes are formed inside the movable die 2 and the fixed die 3. In the first embodiment, as an example, three cooling passages 5 are provided in each of the dies 2 and 3. In this Embodiment 1, in order to distinguish the six cooling passages 5 shown in figure, it is set as the cooling passages 5A-5F. In the first embodiment, the cooling passages 5A to 5F are formed by wire cutting.
The cooling passages 5A to 5F are arranged linearly between the left and right end surfaces 2a and 2b of the movable die 2 and between the left and right end surfaces 3a and 3b of the fixed die 3 so that the adjacent cooling passages 5A to 5F are parallel to each other. ing. The cooling passages 5A to 5F are through-holes communicating between the left and right end faces 2a, 2b, 3a, 3b, and water is supplied from one end face 2a, 3a and drained from the other end face 2b, 3b. The cooling passages 5A to 5F are disposed at positions (distances) that are substantially constant from the cavity 4 over the entire length. The longitudinal direction of the cooling passages 5A to 5F corresponds to the X direction of the product S in FIG.

As shown in FIGS. 1 and 4A, the cooling passages 5 </ b> A to 5 </ b> F are a main passage 6 defined by a circular outline as a cross-sectional shape, and a pair of flat portions projecting in a substantially opposite direction around the main passage 6. The first flat passage 7 and five flat or six flat second passages 8 having a length shorter than that of the first flat passage 7.
The diameter of the main passage 6 is the same for each of the cooling passages 5A to 5F, and the main passage 6 of each of the cooling passages 5A to 5F is the inner peripheral surface of the cavity 4 (opposite of the movable die 2 and the fixed die 3 constituting the cavity 4). Is disposed at an equal distance from the surface.
The first flat passage 7 is formed along the longitudinal direction of the main passage 6 (corresponding to the first direction). The extending direction of the first flat passage 7 is different in the direction orthogonal to the longitudinal direction (corresponding to the second direction) according to the arrangement positions of the cooling passages 5A to 5F. In other words, the phase in the extending direction of the first flat passage 7 with respect to the center of the main passage 6 is designed to be different in relation to the shape of the cavity 4. The first flat passage 7 has a direction in which the distance between the cavity 4 (the opposed surface of the movable die 2 and the fixed die 3 constituting the cavity 4) is kept constant according to the shape of the cavity 4, that is, in the present embodiment of FIG. The main passage 6 is formed in a protruding shape along the direction of the cavity 4 corresponding to the Y direction of the product S of the first embodiment. The pair of left and right first flat passages 7 have substantially the same length, but have different phases in the extending direction. Further, as in the cooling passages 5B and 5E, the cavity 4 may be curved according to the shape of the cavity 4 (the shape of the facing surface of the movable die 2 and the fixed die 3 constituting the cavity 4).
A line segment connecting the first flat passages 7 of the three cooling passages 5A to 5F of the movable die 2 and the fixed die 3 is a cavity 4 (opposite surfaces of the movable die 2 and the fixed die 3 constituting the cavity 4). It will be arrange | positioned substantially parallel.

The second flat passage 8 is also formed along the longitudinal direction of the main passage 6. The second flat passage 8 of each of the cooling passages 5A to 5F is formed in a protruding shape with the main passage 6 as a base. The direction and shape of the second flat passage 8 are designed in accordance with the direction (phase direction) of the first flat passage 7 having a protruding direction different depending on the positions of the cooling passages 5A to 5F. It is designed to be slightly different depending on the shape.
The height (vertical width) of the first flat passage 7 of each of the cooling passages 5 </ b> A to 5 </ b> F is about 1/5 of the diameter of the main passage 6. The length of the first flat passage 7 is about 1.8 times the diameter of the main passage 6. In other words, the first flat passage 7 has a relatively narrow passage area as a passage through which the cooling water passes as compared with the main passage 6. The length of the second flat passage 8 is about １ ／ of the diameter of the passage 6. The height (vertical width) of the second flat passage 8 is configured to be slightly narrower than the height (vertical width) of the first flat passage 7. Both the first flat passage 7 and the second flat passage 8 are formed so that the distal end side has a smooth circular arc shape.

A cooling water supply device 10A serving as an inlet for cooling water is fixed to the left end surface 2a of the movable die 2, and a cooling water supply device 10B is also fixed to the left end surface 3a of the fixed die 3. Further, a cooling water discharge device 11A serving as a cooling water outlet is fixed to the right end surface 2b of the movable die 2, and a cooling water discharge device 11B is also fixed to the right end surface 3b of the fixed die 3.
As shown in FIGS. 3 and 4A and 4B, the end faces 2a and 2b of the movable die 2 and the end faces 3a and 3b of the fixed die 3 have three cooling passages 5A to 5A arranged along the cavity 4, respectively. 5C and 5D to 5F are opened, and three cooling passages 5A to 5C and 5D to 5F that open to the respective end faces 2a, 2b, 3a, and 3b are provided with one cooling water supply device 10A and 10B and one cooling. Cooling is performed by the water discharge device 11.
The cooling water supply devices 10A and 10B and the cooling water discharge devices 11A and 11B are fixed to the end faces 2a, 2b, 3a, and 3b by male screws 13. The male screw 13 is fastened to the female screw 14 formed on each end face 2a, 2b, 3a, 3b via the cooling water supply devices 10A, 10B and the cooling water discharge devices 11A, 11B.
As shown in FIGS. 2 and 4A, cooling passages 5A to 5F are provided at positions facing the end faces 2a, 2b, 3a, and 3b of the cooling water supply devices 10A and 10B and the cooling water discharge devices 11A and 11B. An O-ring 17 for preventing surrounding water leakage is provided. Each of the cooling water supply devices 10A and 10B is provided with three supply connectors 15 at positions corresponding to the cooling passages 5A to 5F. Each of the cooling water discharge devices 11A and 11B is provided with three discharge connectors 16 at positions corresponding to the cooling passages 5A to 5F.
Such a die casting mold 1 is cooled in the cooling passages 5A to 5F under the control of a temperature control device, a cooling water supply control device, etc. (not shown) when a molten die casting alloy is poured into the cavity 4. Water is supplied to cool the die casting mold 1. The cooling water is introduced from the supply connector 15, passes through the movable die 2 and the fixed die 3, and is discharged from the discharge connector 16 on the opposite side.

The following effects are achieved by the first embodiment as described above.
(1) Since the cooling passages 5A to 5F have not only the main passage 6 but also the first flat passage 7, the cooling area is increased as compared with the case of the main passage 6 alone, and the die-cast alloy in the cavity 4 is cooled. As a result, the cooling capacity is improved and the cooling time is shortened. Moreover, since the 1st flat channel | path 7 is extended in the direction (Y direction of the product S of FIG. 5) along the nonlinear shape of the cavity 4, the cavity 4 is easy to be cooled and the cooling time also shortens in this respect Will be. Moreover, since the 1st flat channel | path 7 is extended in the direction along the nonlinear shape of the cavity 4, since the area | region which one cooling channel cools becomes large, the number of cooling channel | paths 5A-5F is small. I'm sorry.
(2) Since the first flat passage 7 is configured to be narrower than the main passage 6 in the cooling passages 5A to 5F, the passage speed of the cooling water in the first flat passage 7 is increased, and the cooling water is quickly replaced. As a result, the cooling effect is increased.
(3) Since the second flat passage 8 is formed in addition to the first flat passage 7 around the main passage 6, the cross-sectional areas of the cooling passages 5A to 5F are increased and the cooling effect is increased. Become.
(4) A plurality of cooling passages 5A to 5F formed in the end faces 2a, 2b, 3a, and 3b are secured by the cooling water supply devices 10A and 10B or the cooling water discharge devices 11A and 11B. Therefore, it is not necessary to provide many cooling water supply devices and cooling water discharge devices.

(Embodiment 2)
The second embodiment is a variation of the first embodiment. As shown in FIG. 6, the die casting mold 21 according to the second embodiment includes a movable die 22 and a fixed die 23 having the same functions as the movable die 2 and the fixed die 3 according to the first embodiment. The cavity 24 is formed by combining opposing surfaces of the movable die 22 and the fixed die 23. The cavity 24 can form the product S of FIG. 5 in the same manner as the cavity 4 of the first embodiment.
Second Embodiment The die casting mold 21 is different from the die casting mold 1 of the first embodiment in the mechanism of water supply / drainage to the cooling passages 25A to 25F. As shown in FIGS. 6 and 7, the cooling passages 25 </ b> A to 25 </ b> F are configured in exactly the same cross-sectional shape as the cooling passages 5 </ b> A to 5 </ b> F of the first embodiment, but the cooling water supply / drainage structure is different. The cooling passages 25 </ b> A to 25 </ b> F include a main passage 26, a first flat passage 27, and a second flat passage 28. Cooling passages 5A to 5F are formed by electric discharge machining in the second embodiment. The main passage 26, the first flat passage 27, and the second flat passage 28 have the same shapes as the main passage 6, the first flat passage 7, and the second flat passage 8 of the cooling passages 5A to 5F of the first embodiment. It is. Therefore, in the following, detailed description of the main passage 26, the first flat passage 27, and the second flat passage 28 is omitted.

A configuration around the cooling water supply / discharge device 30 will be described with reference to FIG. Since FIG. 7 is a view of the movable die 22 side, the movable die 22 side will be described first. 7 shows the cross-sectional structure of the cooling water supply / discharge device 30 at the position of the cooling passage 25B, the cooling passages 25A and 25C have the same structure.
The inside of the cooling passages 25A to 25F of the die casting mold 21 according to the second embodiment has a double structure. As shown in FIG. 7, each of the cooling passages 25 </ b> A to 25 </ b> C is a passage opened only on one end face 22 a. A pipe 29 that exactly matches the outer diameter of the main passage 26 is disposed in each of the cooling passages 25A to 25C. The pipe 29 extends from the deepest part of the cooling passages 25 </ b> A to 25 </ b> C slightly to the front. The base portion of the pipe 29 protrudes outward from the end face 22 a of the movable die 22. One cooling water supply / discharge device 30 is fixed to a position of the movable die 22 end face 22a facing the cooling passages 25A to 25C. An O-ring 31 for preventing water leakage is disposed between the cooling water supply / discharge device 30 and the end face 22a of the movable die 22 and around the cooling passages 25A to 25C. The cooling water supply / discharge device 30 is provided with both a supply connector 32 for supplying cooling water and a discharge connector 33 for discharging cooling water. The pipe 29 protruding from the end face 22 a of the movable die 22 is disposed in the cooling water supply / discharge device 30 and is held in a state where water tightness is maintained by the O-ring 34. The supply connector 32 is connected to the base end position of the pipe 29 so as to be coaxial with the pipe 29.
The discharge connector 33 is arranged so that the tip is upward so that the cooling water is led out in a direction (upward in FIG. 7) 90 degrees different from the direction in which the cooling water is introduced from the supply connector 32. The discharge connector 33 communicates with a space 35 formed in the cooling water supply / discharge device 30. The space 35 faces the opening of each cooling passage 25A-25C.
FIG. 7 is a view of the movable die 22 side, but the configuration around the cooling water supply / discharge device 30 on the fixed die 23 side is such that the direction of the discharge connector 33 is directed downward so that the cooling water is led downward. The difference is that it is arranged in
Such a die-casting die 21 is cooled in the cooling passages 5A to 5F under the control of a temperature control device, a cooling water supply control device, etc. (not shown) when molten metal of the die-cast alloy is poured into the cavity 24. Water is supplied to cool the die casting mold 1. Unlike the first embodiment, when the cooling water is introduced from the supply connector 32, it passes through the pipe 29 integrated with the main passage 26, reaches the deepest part of each cooling passage 25 </ b> A to 25 </ b> C from the tip of the pipe 29, and around the pipe 29. It flows through the first flat passage 27 and the second flat passage 28 and is discharged from the discharge connector 33 through the space 35.
Also in the second embodiment, the same effect as in the first embodiment is exhibited.

The above embodiments are merely described as specific embodiments for illustrating the principle of the present invention and the concept thereof. That is, the present invention is not limited to the above embodiment. The present invention can also be embodied in the following modified form, for example.
In the above description, the cooling passages 5A to 5C and 5D to 5F arranged along the cavity 4 are three each of the movable die 2 and the fixed die 3, but may be two or less or four or more, respectively.
-The cooling passage may be formed by means other than electric discharge machining.
The above is an example of the shape and configuration of the die casting mold 1 (21), and other shapes and configurations may be implemented. For example, in the above description, the cavity 4 (cavity 24) is formed by combining only two movable dies 2 and fixed dies 3 (movable dies 22 and fixed dies 23). A cavity may be formed in combination.
In the first and second embodiments, the cooling water supply devices 10A and 10B and the cooling water discharge devices 11A and 11B or the single cooling water supply / discharge device 30 allow the cooling passages 5A to 5F and 25A to 25F to be simultaneously provided. Although the cooling water supply / discharge structure is covered, for example, a cooling water supply device and a cooling water discharge device are provided in each of the cooling passages 5A to 5F, or cooling is performed in each of the cooling passages 25A to 25F. A water supply / discharge device may be provided. That is, the number of the cooling water supply devices 10A and 10B and the cooling water discharge devices 11A and 11B or one cooling water supply / discharge device 30 is not limited to the above.
In the above embodiment, the first flat passage 7 (27) extends in the orthogonal direction with respect to the longitudinal direction of the cooling passages 5A to 5F and 25A to 25F (main passage 6 (26)). That is, when reflected in the product S of FIG. 5, it is arranged with respect to the cavity 4 (cavity 24) so as to extend in the X direction and the Y direction perpendicular thereto. However, the extending direction can be appropriately changed according to the shape and arrangement of the movable die 2 and the fixed die 3 (movable die 22 and fixed die 23). For example, the cooling passages 5A to 5F and 25A to 25F arranged in parallel. It is also possible to arrange them so that they are not parallel.
For example, the second flat passage 8 (28) may not be formed around the main passage 6 (26), but only the first flat passage 7 (27) may be formed.
In the first and second embodiments, the first flat passage 7 (27) is formed on both sides of the main passage 6 (26).
The above-described extending direction of the first flat passage 7 (27) formed around the main passage 6 (26) is an example, and the extending directions may vary depending on the cavity shape. Moreover, the shape is also an example.
In the above description, the vertical width of the first flat passage 7 (27) is uniformly formed along the longitudinal direction with respect to the main passage 6 (26). May be changed.
The cooling passages 5A to 5F and 25A to 25F have been linearly extended along the direction of the product S in FIG. 5 in the above, but depending on the shape of the cavity 4 (cavity 24), for example, in the middle You may comprise so that it may be bent or curved.
The extending direction of the second flat passage 8 (28) is an example, and it is conceivable that the extending direction varies depending on the cavity shape. Moreover, the shape is also an example.
-In the first and second embodiments, the first flat passage 7 (27) extends in the second direction without being bent or curved in the middle. It is good also as a shape bent or curved in the middle.
In the above description, the die-casting die 1 (21) is embodied. However, the die-casting die 1 (21) can be freely applied to other die that fills the cavity with the heated molten material and cools it.
-Although a cooling water is generally used as a cooling medium, you may make it cool with media other than a cooling water. For example, oil cooled by radiating heat with a radiator may be circulated.
The present invention is not limited to the configuration described in the above embodiment. The components of the above-described embodiments and modifications may be arbitrarily selected and combined. In addition, any component of each embodiment or modification, and any component described in the means for solving the invention or any component described in the means for solving the invention And may be combined arbitrarily. We also intend to acquire rights in these amendments or divisional applications.

  DESCRIPTION OF SYMBOLS 1,21 ... Die-cast metal mold | die, 4, 24 ... Cavity, 5A-5F, 25A-25F ... Cooling channel | path, 6, 26 ... Main channel | path, 7, 27 ... The 1st flat channel | path as a 1st flat part.

Claims (8)

In a mold having a molded product-shaped cavity and a cooling passage in which a cooling medium flows in the vicinity of the cavity,
The cooling passage extends in a first direction along the cavity while maintaining a distance from the cavity, and a first flatness along the cavity in a second direction intersecting the first direction. A mold characterized by having a flexible part.   The mold according to claim 1, wherein the cooling passage includes a main passage and the first flat portion having a narrower width than the main passage.   The mold according to claim 2, wherein the first flat portion is disposed so as to project at an equal distance on both sides of the main passage. In a mold having a molded product-shaped cavity and a cooling passage in which a cooling medium flows in the vicinity of the cavity,
The cooling passage has a main passage extending in a first direction along the cavity while maintaining a distance from the cavity, and a second passage intersecting the first direction separated by the main passage and the partition wall. A first flat portion extending in the direction along the cavity, and the main passage and the first flat portion communicate with each other through a through hole formed in a part of the partition wall. A mold characterized by   The mold according to claim 4, wherein the first flat portion is narrower than the main passage.   3. The cooling passage has one or a plurality of second flat portions extending in the second direction around the main passage and not along the cavity. The metal mold | die in any one of -5.   The mold according to claim 6, wherein the second flat portion has a protruding amount smaller than that of the first flat portion.   The mold according to any one of claims 1 to 7, wherein a plurality of the cooling passages are arranged along the cavity.

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