JPH09155529A - Die cooling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To individually adjust a flow rate and flow speed of cooling fluid flowing to a passage of cooling fluid in a die cooling structure. SOLUTION: A flexible member 20 (reciprocating member) is fixed from the back side of a die 10 by a backing plate 28. The flexible member 20 is expanded by feeding an expansion medium 24 from a feed/drain mouth 26 in an arrow direction D4 and contacted by draining. Thus, when the flexible member 20 is expanded/contracted (that is, reciprocating), a crossing area of a cooling part 32 (part to execute cooling) of a fluid passage 16 (passage for cooling fluid) is changed. Accordingly, in addition to switching of a cooling capacity in conventional modes, it can be switched to a mode, in which a flow of cooling fluid is speed up while decreasing a flow rate and a flow of cooling fluid is slowed while increasing a flow rate. Thus, a diversified cooling mode can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold cooling structure, and more particularly to a technique for cooling a mold while adjusting a flow rate and a flow velocity of a cooling fluid flowing through a cooling fluid passage.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 5-24146 discloses an example of a technique for cooling a mold.
In this technique, a valve is provided in the cooling water passage, and the cooling capacity is adjusted by opening and closing the valve. That is, if the valve is opened wide, the flow rate increases, the flow (flow velocity) also increases, and the cooling capacity increases. On the contrary, if the valve is narrowed down, the flow rate is reduced, the flow is slowed down, and the cooling capacity is lowered.

[0003]

However, in the prior art, since the flow rate and the flow velocity are interlocked with each other, the flow rate is decreased to increase the flow rate, or the flow rate is increased to change the flow rate to a slower mode. I couldn't. For example, when it is necessary to reduce the flow rate in order to reduce the cooling capacity of the mold as a whole, if the flow rate is actually decreased, the flow will slow down and the cooling capacity will change too much between the inlet side and the outlet side of the cooling water. I will end up. Therefore, in order to prevent the cooling capacity from changing between the inlet side and the outlet side, it is necessary to speed up the flow. However, the conventional technique cannot switch to a mode in which the flow rate is reduced and the flow rate is increased. The present invention has been made in view of such a point, and an object thereof is to make it possible to individually adjust the flow rate and the flow (flow velocity) of the cooling fluid flowing in the passage of the cooling fluid.

[0004]

A first aspect of the present invention is a mold cooling structure for cooling a mold, comprising:
It has means for varying the cross-sectional area of the cooling fluid passage in the cooling fluid passage. Here, "cooling fluid" includes cooling fluid such as cooling oil and air in addition to cooling water. According to the first aspect of the present invention, since the cross-sectional area of the portion of the cooling fluid passage where cooling is performed changes, in addition to the switching of the cooling capacity according to the conventional mode,
A mode that reduces the flow rate of the cooling fluid to speed up the flow,
It is also possible to switch to a mode in which the flow rate of the cooling fluid is increased to slow the flow. Therefore, since various cooling modes are realized, the cooling capacity can be kept the same on the inlet side and the outlet side.

[0005]

A second aspect of the present invention is a mold cooling structure for cooling a mold, comprising:
A passage for the cooling fluid is provided in a portion facing the cavity across a wall, and an advancing / retreating member for advancing / retreating from the side opposite to the cavity toward the cavity is provided in the passage. According to the second aspect of the invention, since the advancing / retreating member is moved forward / backward in the passage for the cooling fluid to make the cross-sectional area of the passage variable, it is not necessary to add another device or member to the mold. Therefore, the size of the mold can be suppressed.

[0006]

A third aspect of the present invention is the mold cooling structure according to the second aspect, wherein a fluid reservoir is provided in a part of the passage for the cooling fluid. According to the third aspect of the present invention, by providing the fluid reservoir in a part of the passage for the cooling fluid, it is possible to perform local cooling in a portion for cooling other than the portion where the fluid reservoir is provided. Therefore, it becomes possible to perform the average cooling as a whole by locally cooling the portion having a high temperature distribution in the mold.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment for carrying out the present invention will be described below with reference to the drawings. First Embodiment First, the first embodiment is an application of the present invention to a mold used in a die casting method, which will be described with reference to FIGS. 1 and 2.
Here, FIG. 1 and FIG. 2 are cross-sectional views showing a mold cooling structure. FIG. 1 shows a state in which a cross-sectional area of a portion of a cooling fluid passage for cooling is small, and FIG. Indicates a large value. Here, cooling water or air is selectively used as the cooling fluid and the expansion medium. Note that elements common to FIGS. 1 and 2 are given the same reference numerals. Hereinafter, in order to simplify the description in the present specification, the passage for the cooling fluid is referred to as a “fluid passage”, and a portion of the fluid passage for cooling is referred to as a “cooling portion”.
And the cross-sectional area of the fluid passage is called the "passage cross-sectional area". Further, the "flow" of the cooling fluid means a flow velocity.

In FIG. 1, a mold 10 is a stationary mold and has a convex surface 12 for forming a cavity for molding a mold product. That is, when the movable die having a concave surface (not shown) is moved from above the drawing and fixed at a predetermined position, a cavity is formed between the convex surface 12 and the concave surface. The flexible member 20 is fixed to the back surface side (that is, the lower side of the drawing) of the mold 10 by a back stop plate 28. The flexible member 20 is formed of a material such as airtight cloth or rubber. Further, the flexible member 20 swells when the expansion medium 24 is fed in the direction of the arrow D4 from the feed / discharge port 26 provided at the substantially central portion of the back plate 28, and conversely, as shown in FIG. When the elastic medium 24 is discharged in the direction of arrow D10, the elastic medium 24 contracts.

Returning to FIG. 1, the wall 14 facing the cavity
A fluid passage 16 is formed in a gap between the inner wall surface 14 a, which is the wall surface of the flexible member 20, and the flexible member 20. This fluid passage 16
Is a passage for a cooling fluid for cooling the mold 10, and communicates with a supply port 22 and a discharge port 30 provided on the back side of the mold 10. Therefore, when the flexible member 20 is inflated, the passage cross-sectional area is A2. At this time, the cooling fluid enters the inlet 22 in the direction of arrow D6, passes through the fluid passage 16, and is discharged from the outlet 30 in the direction of arrow D2. On the other hand, the passage cross-sectional area when the flexible member 20 is contracted as shown in FIG. 2 is larger than the passage cross-sectional area A2. At this time, the cooling fluid enters from the inlet 22 in the direction of arrow D12, spreads in the fluid passage 16, is collected in the direction of arrow D8, and is discharged from the outlet 30. In addition, the fluid passages 16 at the portions facing each other across the wall 14 are cooling portions 32 for cooling the die product through the die 10. In addition, the temperature of the mold 10 is 1
8 determines the flow rate and flow rate of the cooling fluid for achieving the appropriate temperature.

The following four modes of Table 1 are realized as an example of a mode in which the mold 10 having the above-described structure is cooled. Table 1 shows the relationship between the passage cross-sectional area and the pressure of the cooling fluid required to achieve the desired flow rate and flow velocity. Hereinafter, the pressure of the cooling fluid will be simply referred to as “pressure”. Here, the size of the passage cross-sectional area changes depending on the capacity of the expansion medium 24 supplied to the flexible member 20, and the level of the pressure changes depending on the operating force of a pump or the like for sending the cooling fluid to the mold 10.

[0011]

[Table 1]

In Table 1 above, in order to realize the mode (a) in which the flow rate of the cooling fluid is increased and the flow speed is increased, the cross-sectional area of the passage may be reduced and the pressure may be increased. Similarly,
Mode (d) in which the flow rate of the cooling fluid is reduced to slow the flow
To achieve the above, the passage cross-sectional area is increased and the pressure is decreased. These aspects (a) and (d) are aspects that can also be realized by conventional techniques. On the other hand, in order to realize the mode (b) in which the flow rate of the cooling fluid is reduced and the flow speed is increased, the cross-sectional area of the passage may be reduced and the pressure may be reduced. Similarly, in order to realize the mode (c) in which the flow rate of the cooling fluid is increased to slow the flow, the passage cross-sectional area is increased and
And the pressure should be increased. These aspects (b) and aspects
(c) is an aspect realized for the first time by the present invention.

Here, since the passage cross-sectional area changes depending on the capacity of the expansion medium 24 fed into the flexible member 20, the passage cross-sectional area set in a plurality of stages and not simply the size of the passage cross-sectional area. It is also possible to realize different flow rate and flow velocity aspects depending on the continuously controlled passage cross-sectional area.
That is, under a constant flow rate (constant pressure), as the volume of the expansion medium 24 supplied to the flexible member 20 increases, the passage cross-sectional area decreases and the flow speed increases. On the contrary, as the volume of the expansion medium 24 supplied to the flexible member 20 decreases, the passage cross-sectional area increases and the flow becomes slow. Therefore, an appropriate flow rate can be obtained by appropriately controlling the volume of the expansion medium 24 supplied to the flexible member 20, and the mold 10 can be cooled in a desired manner.

Therefore, the flexible member 20 (advancing / retreating member)
When the fluid expands or contracts (retracts), the fluid passage 16
The passage cross-sectional area of the cooling portion 32 (the portion for cooling) of the (cooling fluid passage) changes. Therefore, in addition to the switching of the cooling capacity according to the conventional mode, it is possible to switch to a mode in which the flow rate of the cooling fluid is reduced to speed up the flow, or to increase the flow rate to slow down the flow. In this way, since various cooling modes are realized, the cooling capacity can be kept the same on the inlet side and the outlet side, and in turn, the quality of the die product can be maintained uniform and the yield can be improved. Become. Further, even in the case of continuous casting, it becomes possible to reliably cool the mold 10 in the above-mentioned mode.
Further, in order to realize the present embodiment, it is only necessary to scrape off the back surface side of the mold 10 so as to have a capacity necessary for including the flexible member 20 in the fluid passage 16. Therefore, the size of the mold 10 can be suppressed.

Here, the degree of cooling (strength) of the cooling portion 32 is whether air or cooling water is used as the cooling fluid, or reduced pressure air, air or cooling water is used as the expansion medium 24. Depends on This is shown in Table 2.

[0016]

[Table 2]

In Table 2 above, when decompressing air is used as the expansion medium 24, as shown in FIG.
Means that the passage is contracted and the passage cross-sectional area is increased. Further, when air is used as the expansion medium 24, it means that the flexible member 20 is inflated as shown in FIG. 1 and the passage cross-sectional area is reduced. here,
In the case of the mild cooling mode (g), air may be used as the cooling fluid, and reduced pressure air may be used as the expansion medium 24. In addition, a mode in which cooling is performed more strongly than mode (g)
In the case of (h), cooling water may be used as the cooling fluid, and air may be used as the expansion medium 24. In the case of the mode (i) in which the cooling is further strengthened, the cooling fluid and the expansion medium 2
Cooling water may be used for 4 and 5. In the case of the strongest cooling mode (j), the passage cross-sectional area may be increased by using cooling water as the cooling fluid and depressurized air as the expansion medium 24. In this way, the cooling capacity can be changed depending on what is used for the cooling fluid and the expansion medium 24. On the other hand, in the case of the mode (f) in which the cooling is performed weaker than the mode (g), air may be used as the cooling fluid and cooling water may be used as the expansion medium 24. In the case of the mode (e) for further weakly cooling, air may be used for the cooling fluid and the expansion medium 24.

In this way, the cooling capacity increases from the above mode (e) to mode (j) in this order. Therefore, appropriate cooling can be performed by selecting one of the modes depending on the type of the die product to be cooled, the temperature at the time of cooling, and the like. The effect can be further enhanced by making the flexible member 20 a material having high thermal conductivity. Further, if a cooling oil having a cooling capacity different from that in Table 2 above is selectively used as the cooling fluid,
It is possible to further diversify the cooling mode. The cooling capacity can be further diversified by appropriately combining the above-mentioned aspects (a) to (d) and the aspects (e) to (j).

Second Embodiment Next, in the second embodiment, like the first embodiment, the present invention is applied to a mold used in a die casting method. The description will be made with reference to FIGS. 3 and 4. Here, FIG.
4 and FIG. 4 are sectional views showing the mold cooling structure. FIG. 3 shows a state in which the passage cross-sectional area of the cooling portion of the fluid passage is small, and FIG. 4 shows a state in which the passage cross-sectional area is large. Note that elements common to FIGS. 3 and 4 are given the same reference numerals.

In FIG. 3, the die 50 is a fixed-side die and has a convex surface 52 like the die 10 shown in FIG. On the back side of the mold 50 (that is, the lower side in the drawing), a movable member 60 is provided through a spring 72 to a back stop plate 70 formed in a substantially concave shape. The movable member 60
Moves from the side opposite to the cavity toward the side of the cavity, that is, in the direction of arrow D16. The movable member 60 is preferably made of a material having high thermal conductivity such as metal. On the other hand, a fluid passage 56 is formed in the gap between the inner wall surface 54 a, which is the wall surface of the wall 54 facing the cavity, and the movable member 60. The fluid passage 56 is a passage for a cooling fluid for cooling the mold 50, and communicates with a supply port 68 and a discharge port 78 provided on the back side of the mold 50. Here, the pressurizer 64 is provided at the inlet 68, and the cooling fluid flowing from the inlet pipe 66 is pressurized to be supplied to the inlet 68 in the direction of arrow D22. A pressure valve 76 is provided at the discharge port 78, and the amount of the cooling fluid discharged from the fluid passage 56 in the direction of the arrow D20 is reduced to flow out to the discharge pipe 74.

In the die 50 having the above structure, when the spring 60 is extended, the passage sectional area is A4.
become. On the other hand, when the spring 60 is contracted as shown in FIG. 4, the passage sectional area A6 is larger than the passage sectional area A4. It should be noted that the fluid passage 5 at the portion facing the wall 54
6 is a cooling part 80 for cooling the mold product through the mold 50.
It is. Further, the temperature T of the mold 50 is measured by the thermometer 58, and the pressurizer 64 and the pressure valve 76 are adjusted by the flow rate control device 62 which receives the temperature T. Thus, by performing the feedback control, the flow rate and the flow velocity of the cooling fluid are controlled, and it becomes possible to perform appropriate cooling.

Here, in order to change the passage cross-sectional area, specifically, the following may be performed. That is, the pressure valve 76
When the pressure of the cooling fluid is increased by the pressurizer 64 when the pressure is fixed to a predetermined opening, the spring 72 contracts and the passage cross-sectional area increases. Conversely, if the pressure of the cooling fluid is lowered by the pressurizer 64, the spring 72 extends and the passage cross-sectional area decreases. On the other hand, when the pressurizer 64 is kept at a predetermined pressure, if the pressure valve 76 is narrowed down, the pressure of the cooling fluid increases, and the spring 72 contracts to increase the passage cross-sectional area. On the contrary, if the pressure valve 76 is opened wide, the pressure of the cooling fluid becomes low, the spring 72 extends, and the passage cross-sectional area becomes small. This can be summarized as shown in Table 3 below, and the same four aspects as in Table 1 described above are realized. In this way, by appropriately controlling the pressurizer 64 and the pressure valve 76,
Various cooling modes can be realized.

[0023]

[Table 3]

Therefore, if the movable member 60 (advancing / retracting member) is moved back and forth within the fluid passage 56 (cooling fluid passage),
The passage cross-sectional area of the cooling portion 80 (the portion for cooling) changes. Therefore, the same effect as that of the above-described first embodiment can be obtained. Further, when the present embodiment is realized, the aspect in which the back side of the mold 50 is scraped off and the movable member 60 is included is also the same as in the first embodiment, and therefore the size of the mold 50 can be suppressed.

[Third Embodiment] Next, the third embodiment is a form to which the above two embodiments are applied, and will be described with reference to FIGS. 5 and 6. Here, FIG.
6 and 6 are sectional views showing the mold cooling structure, FIG. 5 shows an application example of the first embodiment, and FIG. 6 shows an application example of the second embodiment. The same elements as those in FIGS. 1 and 3 are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 5, when the recess 20 a is provided in the flexible member 20, the fluid reservoir 16 is formed in the fluid passage 16 of the mold 10. Specifically, the recess 20a may be formed by thinning a part of the airtight cloth or softening a part of the rubber. Similarly, as shown in FIG. 6, when the recess 60 a is provided in the movable member 60, a fluid reservoir 82 is formed in the fluid passage 56 of the mold 50.

Since the flow of the cooling fluid is slow in the fluid pools 34, 82, the cooling parts 32, 80 corresponding to the fluid pools 34, 82 have a lower cooling capacity than the other cooling parts. Therefore, the fluid reservoirs 34, 82
The cooling parts 32 and 80 of the parts provided with can perform mild cooling. In addition, the cooling parts 32 other than this part,
80 can be locally cooled. In particular, it is effective in the case of locally cooling a portion having a high temperature distribution in the molds 10 and 50 and performing averaged cooling as a whole.

The flexible member 20 shown in FIG. 5 is not limited to the mode in which the concave portion 20a is provided at one place, but the concave portion 20a is not limited thereto.
May be increased or decreased in size, or may be provided in two or more locations (and thus in a wavy shape). This also applies to the movable member 60 shown in FIG.
In this way, since cooling can be performed separately for the part that is mildly cooled and the part that is strongly cooled according to the surface temperature of the convex surfaces 12, 52, it is possible to perform appropriate cooling according to each part (region). .

[Other Embodiments] The structure, shape, size, material, number, arrangement, operating conditions, etc. of the other parts in the mold cooling structure described above are not limited to the one embodiment described above. . For example, the following embodiments that apply the above-described embodiment can be implemented. (1) As shown in FIG. 7, in a partial section of the fluid passage 16, the slope portion 20b is flexible so that the passage cross-sectional area gradually decreases from the inlet 22 side to the outlet 30 side of the section. It may be provided on the elastic member 20. In this case, in the cooling portion 32 corresponding to a part of the fluid passage 16, the portion having a large passage sectional area is mildly cooled, the degree of cooling is gradually increased, and the portion having a small passage sectional area is strongly cooled. It will be. Therefore, according to this aspect, when the surface temperature of the convex surface 12 is substantially uniform, the die product can be cooled substantially uniformly. In a part of the fluid passage 16, the slope portion is provided with the flexible member 20 so that the passage cross-sectional area gradually increases from the inlet 22 side to the outlet 30 side of the section.
May be provided. Further, in these configurations, the slope portion is provided in the movable member 6 in a partial section of the fluid passage 56 shown in FIG.
By setting it to 0, it can be similarly implemented.

(2) As shown in FIG. 8, a means for moving the movable member 60 back and forth from the side opposite the cavity to the side of the cavity may be provided by using the pulse motor 92 capable of rotating in the forward and reverse directions. Specifically, a screw hole is provided in the movable member 60,
A screw screw 90 screwed into the screw hole is connected to the rotary shaft of the pulse motor 92. In this structure, when the screw screw 90 rotates forward and backward, the movable member 6 is passed through the screw hole.
0 moves back and forth in the direction of arrow D16. Therefore, according to this aspect, the size of the passage cross-sectional area can be accurately changed by controlling the rotation of the pulse motor 92. Further, there may be provided means for performing feedback control for controlling rotation of the pulse motor 92 based on the temperature measured by the thermometer 58 according to the difference from the target temperature.
According to this means, the die product can be cooled more reliably at the target temperature.

In addition, the rod member may be fixed to the movable member 60 and the rod member may be moved in the direction of arrow D16. Specifically, a mechanism (for example, a rack and pinion mechanism) that converts the forward / reverse rotational movement of the pulse motor 92 into the reciprocating movement of the rod may be provided. If the pulse motor 92 is of a type that rotates in one direction, a mechanism that converts the rotational movement of the pulse motor 92 into reciprocating movement of the rod (for example, a piston connected to a crankshaft or a rotary shaft is provided). For example, a bar member that reciprocates by an arm that contacts the surface of the cam may be provided.

(3) The present invention is applied to the fixed-side mold like the mold 10 shown in FIG. 1 and the mold 50 shown in FIG. 3, but can be similarly applied to the movable-side mold. Is. Even in this case, obviously, the same effect as that of the above-described one embodiment is obtained. (4) The present invention is not limited to a mold used in the die casting method (that is, a method of casting while applying pressure) shown in the above-described one embodiment, and a gravity metal for casting by dropping a molten metal into the mold according to gravity. It is also applied when cooling the mold of the mold casting method, the mold of the molten metal forging method in which casting is performed by applying high pressure in the mold or during solidification, or the mold for injection molding for molding powder, plastic material, etc. It is possible to Further, the present invention can be applied to the case of cooling an object formed of a metal in a predetermined shape, such as an air conditioner or an automobile engine. Even in the case of these metal bodies, it is clear that the same effect as that of the above-mentioned one embodiment can be obtained.

[0032]

Other embodiments of the present invention have been described above. This embodiment has the following aspects of the invention in addition to the aspects of the invention described in the claims. It is. While listing the aspects of the present invention,
Provide related explanations as necessary.

[Aspect 1] In the mold cooling structure according to claim 2, the advancing / retreating member has a flexible member that expands and contracts in a passage of the cooling fluid, or has a predetermined shape, and inside the passage of the cooling fluid. A mold cooling structure, characterized in that it is a member that can be moved by. According to the first aspect, since the flexible member or the movable member is advanced and retracted in the cooling fluid passage, the cross-sectional area of the passage can be easily changed.

[Aspect 2] A cooling structure for cooling a metal body, characterized in that a cross-sectional area of a passage for a cooling fluid in a cooling portion provided corresponding to a heat source is variable. Cooling structure. According to the second aspect, the cross-sectional area of the passage of the cooling fluid changes in the portion for cooling. Therefore, in addition to the switching of the cooling capacity according to the conventional mode, it is possible to switch to a mode in which the flow rate of the cooling fluid is reduced to speed up the flow, or to increase the flow rate of the cooling fluid to slow down the flow. Become. In this way, since various cooling modes are realized, it becomes possible to effectively cool the metal body. Therefore, it is possible to appropriately cool the metal body which is formed of a metal and has a predetermined shape.

[Aspect 3] A cooling structure for cooling a metal body, which is provided in a portion of a cooling fluid passage where cooling is performed, and has a cross-sectional area larger than a cross-sectional area of the cooling fluid passage. A cooling structure, comprising: a space having the space; and an advancing / retreating member that operates in the space and changes a cross-sectional area of the space. According to the third aspect, the cross-sectional area of the space changes depending on the advancing / retreating member that operates in the space provided in the cooling area. Therefore, in addition to the switching of the cooling capacity according to the conventional mode, it is possible to switch to a mode in which the flow rate of the cooling fluid is reduced to speed up the flow, or to increase the flow rate of the cooling fluid to slow down the flow. Become.

[0036]

According to the first aspect of the present invention, the cross-sectional area of the cooling fluid passage in the cooling fluid passage can be varied, so that the cooling capacity can be switched in addition to the conventional mode. It is also possible to switch to a mode in which the flow rate of the fluid is reduced to speed up the flow, and a mode in which the flow rate of the cooling fluid is increased to slow down the flow. Therefore, since various cooling modes are realized, it is possible to cool at a substantially uniform temperature. Therefore, it becomes possible to maintain the quality of the die product uniformly and improve the yield.

According to the second aspect of the invention, since the advancing / retreating member is moved forward / backward in the passage for the cooling fluid to change the cross-sectional area of the passage, it is necessary to add another device or member to the mold. Absent. Therefore, the size of the mold can be suppressed.

According to the third aspect of the invention, since the cooling fluid reservoir is provided in a part of the passage for the cooling fluid, local cooling can be performed. Therefore, by locally cooling the part having a high temperature distribution in the mold, the average cooling can be performed as a whole.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first mold cooling structure.

FIG. 2 is a cross-sectional view showing a first mold cooling structure.

FIG. 3 is a cross-sectional view showing a second mold cooling structure.

FIG. 4 is a cross-sectional view showing a second mold cooling structure.

FIG. 5 is a cross-sectional view showing a third mold cooling structure.

FIG. 6 is a cross-sectional view showing a fourth mold cooling structure.

FIG. 7 is a cross-sectional view showing a fifth mold cooling structure.

FIG. 8 is a cross-sectional view showing a sixth mold cooling structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mold 12 Cavity 14 Wall 14a Inner wall surface 16 Fluid passage 18 Thermometer 20 Flexible member 22 Feed port 24 Expansion / contraction medium 26 Feed / discharge port 28 Back plate 30 Discharge port 32 Cooling part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mitsuru Inui 1-9-6 Rokujo Minami, Gifu City, Gifu Prefecture Gifu Seiki Kogyo Co., Ltd. 1st Division (72) Kento Nimura Kenichi Nimura, Gifu City, Gifu Prefecture 1st Division, Gifu Seiki Kogyo Co., Ltd. (72) Inventor Akira Saito 1-9-6, Rokujo Minami, Gifu City, Gifu Prefecture Gifu Seiki Industry Co., Ltd. 1st Division

Claims (3)

[Claims] 1. A mold cooling structure for cooling a mold, wherein a cross-sectional area of a cooling fluid passage in a cooling fluid passage is variable. 2. A mold cooling structure for cooling a mold, wherein a passage for a cooling fluid is provided in a portion facing the cavity with a wall therebetween, and a passage for cooling fluid is provided in the passage from a side opposite to the cavity side to the cavity side. A mold cooling structure comprising an advancing / retreating member for advancing / retreating. 3. The mold cooling structure according to claim 2, wherein a fluid reservoir is provided in a part of the passage for the cooling fluid.