JP2021146346A - Method for manufacturing plate material and plate material - Google Patents

Abstract

To provide a method for manufacturing a plate material and a plate material capable of shortening the time for manufacturing a plate material having a cooling hole.SOLUTION: A method for manufacturing a plate material 30 having a cooling hole 40 includes a through hole formation step of forming a through hole on a member to be processed, and a rolling step of performing cold rolling on the member to be processed formed with the through hole so as to deform the through hole. The through hole has a circular first opening formed on the surface of the member to be processed. In the rolling step, rolling is performed so as to increase the ratio of the length of the first opening in a first radial direction and the length in a second radial direction orthogonal to the first radial direction.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a plate material manufacturing method and a plate material.

For example, there is known a technique for forming a cooling hole for flowing cooling air in a member having a high temperature such as a blade of a gas turbine (for example, Patent Document 1).
Patent Document 1 describes a gas turbine blade in which a flow path for guiding cold air is formed on the outer surface of the blade. The flow path has a hole that is inclined at an angle G with respect to the outer surface. The angle G is less than 90 °, preferably in the range of 15 ° to 80 °. Further, the holes are formed by making holes using a laser.

JP-A-2007-32567

The cooling hole formed in a member that becomes hot (hereinafter referred to as "high temperature member") such as a blade of a gas turbine is preferably a high temperature member depending on the shape and size of the opening formed on the surface of the high temperature member. There was a possibility that it could not be cooled.

Further, in Patent Document 1, an inclined hole is formed by making a hole in the turbine by using a laser. In this case, the amount of removing the object is increased as compared with the case of forming a hole that is not inclined (that is, a hole that makes an angle of 90 degrees with respect to the outer surface). This could increase the time it takes to form the holes. In particular, when a plurality of cooling holes are formed, the time for forming all the holes may increase.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a plate material manufacturing method and a plate material capable of improving cooling efficiency.
Another object of the present invention is to provide a plate material manufacturing method and a plate material capable of shortening the time for manufacturing a plate material having cooling holes.

In order to solve the above problems, the following means are adopted for the plate material manufacturing method and the plate material of the present disclosure.
The method for producing a plate material according to one aspect of the present disclosure is a method for producing a plate material having a cooling hole, which includes a through hole forming step of forming a through hole in a member to be processed and the above-mentioned method of forming the through hole. The member to be machined is provided with a rolling step of performing cold rolling so as to deform the through hole.

The plate material according to one aspect of the present disclosure is a plate material having a cooling hole, the cooling hole is a through hole, and has an elliptical opening formed on the surface, and the opening is a minor axis. The length of the major axis is 1.5 times or more and 5 times or less with respect to the length, and the length of the major axis is 0.01 mm or more and 0.5 mm or less. Is.

According to the present disclosure, the cooling efficiency of the manufactured plate material can be improved. In addition, the time for manufacturing a plate material having cooling holes can be shortened.

It is a schematic perspective view which shows the rolling process of the manufacturing method of the plate material which concerns on 1st Embodiment of this disclosure. It is a top view which shows the member to be processed before performing the rolling process which concerns on the manufacturing method of the plate material which concerns on 1st Embodiment of this disclosure. FIG. 2 is a cross-sectional view taken along the line III-III in FIG. It is a top view which shows the member to be processed after the rolling process which concerns on the manufacturing method of the plate material which concerns on 1st Embodiment of this disclosure. It is a cross-sectional view taken along the line VV of FIG. It is a schematic side view which shows the rolling process of the manufacturing method of the plate material which concerns on 1st Embodiment of this disclosure. It is a top view which shows the member to be processed before performing the rolling process which concerns on the manufacturing method of the plate material which concerns on 2nd Embodiment of this disclosure. It is a top view which shows the member to be processed after the rolling process which concerns on the manufacturing method of the plate material which concerns on 2nd Embodiment of this disclosure. FIG. 8 is a cross-sectional view taken along the line IX-IX of FIG. It is sectional drawing which shows the modification of FIG. It is a schematic perspective view which shows the modification of the rolling process of the plate material manufacturing method which concerns on 2nd Embodiment of this disclosure. It is a schematic perspective view which shows the modification of the rolling process of the plate material manufacturing method which concerns on 1st Embodiment and 2nd Embodiment of this disclosure.

Hereinafter, a method for manufacturing a plate material and an embodiment of the plate material according to the present disclosure will be described with reference to the drawings. In the following description, the plate thickness direction of the member to be machined is the Z-axis direction, the direction in which the member to be machined moves in the rolling process is the X-axis direction, and the Z-axis direction and the direction orthogonal to the X-axis direction are the Y-axis. Explained as a direction. In the figure, the vertical direction of the paper surface is the Z-axis direction, the left-right direction of the paper surface is the X-axis direction, and the depth direction of the paper surface is the Y-axis direction.

[First Embodiment]
Hereinafter, the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 6.
The plate material 30 manufactured by the manufacturing method according to the present embodiment becomes hot with the use of the applied product, for example, the surface layer of a flying object such as a rocket flying at high speed, a gas turbine device, or a blade of an aircraft engine. Applies to. Therefore, the plate material 30 is formed with a plurality of cooling holes 40 (see FIG. 4) for cooling the plate material 30 itself.

The plate material 30 forms a through hole 20 in the plate-shaped member 10 to be machined (through hole forming step), and cold-rolls the member 10 in which the through hole 20 is formed (rolling step). Manufactured by (see FIG. 1). The manufactured plate material 30 is subsequently deformed and formed into a surface layer of a flying object, a blade of a gas turbine device, and the like. In FIG. 1, for the sake of illustration, the through hole 20 is omitted.
Hereinafter, each step will be described in detail.

[Through hole forming process]
In the through hole forming step, as shown in FIG. 2, a plurality of through holes 20 are formed in the flat plate-shaped workpiece 10. The member 10 to be processed is made of, for example, a heat-resistant alloy such as a titanium alloy or a nickel alloy. Further, since the shapes of the through holes 20 are substantially the same, the shape of one through hole 20 will be described below as a representative, and the description of the other through holes 20 will be omitted. The plurality of through holes 20 are arranged side by side at predetermined intervals along the X-axis direction and the Y-axis direction. The plurality of through holes 20 are formed over substantially the entire area of the member 10 to be processed.

As shown in FIG. 3, the through hole 20 penetrates the member 10 to be machined in the Z-axis direction. Further, the through hole 20 is formed so that the central axis C1 is along the Z-axis direction. That is, the angle θ1 formed by the central axis C1 and the plate surface (the surface formed by the X-axis direction and the Y-axis direction) of the member 10 to be processed is 90 degrees.

The through hole 20 has a first opening (opening) 21 formed on one side surface (hereinafter, referred to as “one surface 11”) of the plate surface of the member 10 to be processed, and the other side surface (hereinafter, referred to as “one surface 11”). It has a second opening 22 formed in (referred to as "other surface 12"). The through hole 20 has substantially the same shape as the first opening 21 and the second opening 22. As shown in FIG. 2, the first opening 21 has a perfect circular shape. That is, the first opening 21 has a length L1 in the first radial direction (X-axis direction in the present embodiment) and a second radial direction (Y-axis direction in the present embodiment) which is orthogonal to the first radial direction. ) Is substantially the same as the length L2. The size of the through hole 20 is determined by the required cooling performance and the like, and for example, the diameter (lengths L1 and L2) of the first opening 21 is 10 mm or less.

The method for forming the through hole 20 is not particularly limited. The through hole 20 may be formed by laser machining, or the through hole 20 may be formed by drilling. Further, the through hole 20 may be formed by electric discharge machining. The method of forming the through hole 20 may be determined by the size of the through hole 20 to be formed. For example, when the diameter of the first opening 21 is 0.2 mm or less, it is difficult to form the through hole 20 by drilling or electric discharge machining, so it is preferable to form the through hole 20 by laser machining. Is. Further, when the diameter of the first opening 21 is larger than 0.2 mm, the through hole 20 may be formed by drilling or electric discharge machining. When the diameter of the first opening 21 is larger than 0.2 mm, the through hole 20 may be formed by laser processing.

[Rolling process]
In the rolling step, as shown in FIG. 1, cold rolling is performed on the member 10 to be processed. Specifically, the first roller 50 that comes into contact with one surface 11 of the member 10 to be processed and the second roller 51 that comes into contact with the other surface 12 of the member 10 to be processed sandwich the member 10 to be processed, and the first roller 50 and the first roller 50 and the first roller 51 come into contact with each other. 2 The member 10 to be processed is rolled by the pressing force of the roller 51. The first roller 50 and the second roller 51 rotate about a central axis extending along the Y-axis direction. Further, the rotation speed of the first roller 50 and the rotation speed of the second roller 51 are the same. Further, the rotation direction of the first roller 50 (see arrow A1) and the rotation direction of the second roller 51 (see arrow A2) are opposite directions. That is, the rotation direction of the first roller 50 and the rotation direction of the second roller 51 are the rotation directions for moving the member 10 to be processed in the same direction (the direction indicated by the arrow A3 in FIG. 1). Therefore, the member 10 to be rolled moves along the X-axis direction.

Further, in the rolling step, the member 10 to be processed is rolled so that the rolling reduction ratio is 5% or more and 10% or less. As shown in FIG. 6, when the thickness of the work member 10 before rolling is h1 and the thickness of the work member 10 (in other words, the plate material 30) after rolling is h2, the rolling reduction ratio is as follows. It is represented by the equation (1) of.

(H1-h2) / h1 ... (1)
However, h1: the thickness of the work member 10 before rolling h2: the thickness of the work member 10 after rolling

As shown in FIG. 4, the member 10 to be processed is deformed by rolling to become a plate member 30. A plurality of cooling holes 40 are formed in the plate material 30. Each cooling hole 40 is a modification of each through hole 20 formed in the member 10 to be processed. The plate material 30 of the present embodiment is a plate-shaped member having a thickness thinner than that of the member 10 to be processed.

As shown in FIG. 5, the cooling hole 40 extends in the Z-axis direction. Further, the cooling hole 40 is formed so that the central axis C2 is along the Z-axis direction. That is, the angle θ1 formed by the central axis C2 and the plate surface of the plate material 30 (the surface formed by the X-axis direction and the Y-axis direction) is 90 degrees.

Further, the cooling hole 40 has a third opening 41 formed on one side surface (hereinafter, referred to as “one surface 31”) of the plate surface of the plate material 30 and the other side surface (hereinafter, “other surface”). It has a fourth opening 42 formed in (referred to as 32). The shape of the cooling hole 40 is substantially the same as that of the third opening 41 and the fourth opening 42. As shown in FIG. 4, the first opening 21 has a length L3 in the first radial direction (X-axis direction in the present embodiment) in the second radial direction (the present embodiment) in which the length L3 is orthogonal to the first radial direction. The elliptical shape is longer than the length L4 in the Y-axis direction. The length L3 of the cooling hole 40 in the second radial direction (hereinafter, also referred to as “length of the major axis”) is longer than the length L1 of the through hole 20 in the second radial direction.

The length (hereinafter, also referred to as “length of the major axis”) L3 of the cooling hole 40 in the second radial direction may be, for example, 10 mm or less. Further, the length L3 of the major axis may be 0.01 mm or more and 0.5 mm or less.
Further, the length L3 of the major axis of the first opening 21 is 1.5 times or more the length L4 in the first radial direction (hereinafter, also referred to as “the length of the minor axis”). And it is said to be 5 times or less. It is more preferable that the length L3 of the major axis of the first opening 21 is twice as long as the length L4 of the minor axis.

[Annealing process]
If the member 10 to be processed cannot be deformed into a desired shape (that is, the shape of the plate member 30) in one rolling step, the rolling step may be repeated a plurality of times. However, in cold rolling, residual stress is accumulated in the object to be processed (member to be processed 10). Therefore, the stress may be removed by annealing the member 10 to be machined during the rolling process. The annealing step may be performed every time the rolling process is performed, or may be performed every time the rolling process is performed a plurality of times.
By doing so, the member 10 to be processed can be gradually rolled and the through hole 20 can be gradually deformed. Therefore, the processing accuracy can be improved. In addition, the stress remaining on the member 10 to be processed can be removed by the rolling process. Therefore, it is possible to suppress a decrease in the strength of the member 10 to be processed.

In this embodiment, the following effects are exhibited.
In the present embodiment, after the through hole 20 is formed, the member 10 to be processed in which the through hole 20 is formed is rolled. When the member 10 to be processed is rolled, the member 10 to be processed is stretched. As a result, the through hole 20 formed in the member 10 to be processed is deformed so as to be large. That is, the cooling hole 40 of the plate material 30 can be enlarged. Therefore, the cooling efficiency of the manufactured plate material 30 can be improved as compared with the case where rolling is not performed.

Further, the cooling hole 40 is formed by enlarging the through hole 20 in the rolling process. That is, the through hole 20 formed in the through hole forming step is smaller than the cooling hole 40. As a result, the size of the through hole 20 formed with respect to the plate-shaped member to be processed 10 can be reduced as compared with the case where the through hole 20 having the same size as the cooling hole 40 is formed. Therefore, since the amount of the member 10 to be processed when forming the through hole 20 is reduced, the processing time for forming the through hole 20 can be shortened. Therefore, the time for manufacturing the plate material 30 having the cooling holes 40 can be shortened.

Specifically, in the present embodiment, the first opening 21 having a perfect circular shape is rolled so as to become the third opening 41 having an elliptical shape. That is, rolling is performed so that the ratio of the length of the opening in the first radial direction and the length in the second radial direction becomes large. As a result, a member (plate material) for forming a hole (cooling hole 40) is formed in the plate material 30 as compared with a case where a cooling hole 40 having an elliptical opening shape is formed by laser processing, drilling, or the like. Since the amount of removal of 30) is reduced, the processing time for forming the holes (cooling holes 40) can be shortened. Therefore, the time for manufacturing the plate material 30 having the cooling holes 40 can be shortened.

Further, in the present embodiment, a plurality of through holes 20 can be deformed at the same time. Therefore, when a large number of cooling holes 40 are formed in the plate material 30 as in the present embodiment, the processing time can be shortened by the number of the cooling holes 40, so that the time for manufacturing the plate material 30 can be significantly shortened. can do.

Further, in the present embodiment, the third opening 41 and the fourth opening 42 of the cooling hole 40 have an elliptical shape. As a result, the fluid that has passed through the cooling hole 40 and is discharged from the first opening 21 and / or the second opening 22 can easily flow along the surface (one surface 31 and / or the other surface 32) of the plate material 30. Therefore, since a fluid film can be easily formed on the surface of the plate material 30, the plate material 30 can be suitably cooled. Therefore, the cooling efficiency of the plate material 30 can be improved.

Further, the first opening 21 and the second opening 22 have an elliptical shape in which the length of the major axis is 1.5 times or more and 5 times or less the length of the minor axis. Thereby, a fluid film can be more preferably formed on the surface of the plate material 30. Therefore, the cooling efficiency can be further improved. Further, when the shapes of the first opening 21 and the second opening 22 are elliptical shapes in which the length of the long axis is twice the length of the short axis, the fluid is more preferably applied to the surface of the plate material 30. Film can be formed. Therefore, the cooling efficiency can be further improved.

[Second Embodiment]
Hereinafter, the second embodiment of the present disclosure will be described with reference to FIGS. 7 to 9. In this embodiment, the shape of the through hole formed in the member to be machined is different from that in the first embodiment. Further, it is different from the first embodiment in that the rotation speed of the first roller and the rotation speed of the second roller in the rolling process are different. Along with this, the shape of the cooling holes formed in the plate material is different from that of the first embodiment. Since other points are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and detailed description thereof will be omitted.

In the through hole forming step according to the present embodiment, as shown in FIG. 7, a through hole 60 having an elliptical shape of the first opening 61 and the second opening 62 is formed in the member 10 to be processed. Similar to the first embodiment, the through hole 60 has an angle formed by the central axis and the plate surface of the member 10 to be processed at 90 degrees.

Further, in the rolling process according to the present embodiment, cold rolling is performed by the first roller 50 and the second roller 51 having different rotation speeds. Specifically, the ratio of the rotation speed of the first roller 50 to the rotation speed of the second roller 51 is 2: 1.

By rolling in this way, as shown in FIGS. 8 and 9, the cooling holes 80 of the plate material 30 have an inclined shape. Specifically, the angle formed by the central axis C3 of the cooling hole 80 and the plate surface (one surface 31 and the other surface 32) of the plate material 30 to be an acute angle (hereinafter referred to as “inclination angle θ2”) is abbreviated. The cooling hole 80 is inclined so as to be 60 degrees. The value of the tilt angle θ2 is not limited to this. The inclination angle θ2 may be 10 degrees or more and smaller than 90 degrees.
As described above, in the present embodiment, rolling is performed so that the angle formed by the plate surface of the member 10 to be machined and the central axis of the through hole 60 becomes small.
The lengths of the third opening 81 and the fourth opening 82 of the cooling hole 80 in the major axis direction are substantially the same.

According to this embodiment, the following effects are exhibited.
In this embodiment, the cooling hole 80 is inclined with respect to the plate surface. As a result, the length of the cooling hole 80 becomes long. Therefore, the cooling efficiency of the manufactured plate material 30 can be improved. Further, since it is inclined with respect to the plate surface, the fluid that passes through the cooling hole 80 and is discharged from the first opening 61 and / or the second opening 62 is the surface (one surface 31 and / or the other surface) of the plate material 30. It becomes easy to distribute along 32). Therefore, since a fluid film can be easily formed on the surface of the plate material 30, the plate material 30 can be suitably cooled. Therefore, the cooling efficiency of the plate material 30 can be improved.

Further, in the present embodiment, a through hole 60 that is not inclined with respect to the member 10 to be processed is formed, and the member 10 to be processed is rolled to form an inclined cooling hole 80. As a result, the amount of the member (plate material 30) removed when forming the holes (cooling holes 80) is compared with the case where the plate material 30 is formed with the inclined cooling holes 80 by laser processing, drilling, or the like. Is reduced, so that the processing time for forming the hole (cooling hole 80) can be shortened.

Further, in the present embodiment, the rotation speeds of the first roller 50 and the second roller 51 for rolling are different. As a result, in the rolling process, the degree of stretching differs between the one surface 11 side of the workpiece 10 in contact with the first roller 50 and the other surface 12 side of the workpiece 10 in contact with the second roller 51. Therefore, since the relative positions of the first opening 61 formed on one surface 11 of the member 10 to be processed and the second opening 62 formed on the other surface 12 of the member 10 to be processed change, the inclination angle of the through hole 60 is changed. Also changes. Therefore, the inclination angle of the through hole 60 can be easily changed. In the present embodiment, since the inclination angle is made small, the cooling efficiency of the plate material 30 can be easily improved.

As shown in FIG. 10, the length L5 of the long axis of the third opening 81A and the length L6 of the long axis of the fourth opening 82A may be different lengths. Specifically, the length L5 of the major axis of the third opening 81A may be longer than the length L6 of the major axis of the fourth opening 82. By forming the cooling holes 80A in this way, cooling air can easily flow into the cooling holes 80A, so that the cooling efficiency of the plate material 30 can be improved.

Further, as shown in FIG. 11, the rotation direction of the first roller 50 (see arrow A1) and the rotation direction of the second roller 51 (see arrow A4) may be the same direction. That is, the first roller 50 rotates so as to move the member 10 to be machined in one side in the X-axis direction (the direction indicated by the arrow A5 in FIG. 11), and the second roller 51 moves the member 10 to be machined 10 on the X-axis. It is rotated so as to move to the other side of the direction (the direction indicated by the arrow A6 in FIG. 11). At this time, in the present embodiment, the rotation speed of the first roller 50 is faster than the rotation speed of the second roller 51, so that the member 10 to be rolled is on one side in the X-axis direction (arrow in FIG. 11). Move in the direction indicated by A5).
With this configuration, in the rolling process, one surface 11 side of the workpiece 10 in contact with the first roller 50 and the other surface 12 side of the workpiece 10 in contact with the second roller 51 are extended. The directions are opposite. Therefore, since the relative position between the first opening formed on one surface 11 of the member 10 to be processed and the second opening formed on the other surface 12 of the member 10 to be processed changes more greatly, the inclination angle of the through hole also changes. It changes more. Therefore, the inclination angle of the through hole can be easily changed more greatly.

It should be noted that the present disclosure is not limited to the configuration of each of the above embodiments, and changes and improvements can be appropriately made without departing from the gist of the present disclosure. The form is also included in the scope of rights of this disclosure.

For example, in each of the above embodiments, an example in which the first roller 50 and the second roller 51 for rolling are each one has been described, but the present disclosure is not limited to this. For example, as shown in FIG. 12, rolling may be performed by a plurality of first rollers 50 and a plurality of second rollers 51.

Further, in the second embodiment, an example in which the first opening 61 and the second opening 62 of the through hole 60 have an elliptical shape has been described, but the present disclosure is not limited to this. For example, as in the first embodiment, the first opening and the second opening of the through hole formed in the through hole forming step may have a perfect circular shape. In this case, rolling is performed to deform the first opening and the second opening into an elliptical shape, and to incline the central axis of the through hole. By doing so, the time for forming the through hole can be shortened as compared with the case where the first opening and the second opening formed in the through hole forming step have an elliptical shape. When the first opening 61 and the second opening 62 of the through hole 60 have an elliptical shape as in the second embodiment, it is only necessary to incline the through hole 60, so that the through hole 60 can be processed relatively easily. Can be done. Therefore, the processing accuracy can be improved.

Further, a high friction material having a friction coefficient higher than that of each roller may be provided on substantially the entire surface of the first roller 50 and the second roller 51 (the surface in contact with the member 10 to be processed). The high friction material is, for example, rubber. With this configuration, even when the reduction rate of the member to be processed 10 is low (that is, even when the force for sandwiching the member 10 to be processed by the first roller 50 and the second roller 51 is weak). , The idling of the first roller 50 and the second roller 51 can be suppressed. Therefore, the processing accuracy can be improved.

The method of manufacturing the plate material and the plate material described in each of the above-described embodiments are grasped as follows, for example.
The method for manufacturing a plate material according to one aspect of the present disclosure is a method for producing a plate material (30) having a cooling hole (40), and is a penetration that forms a through hole (20) with respect to a member to be processed (10). It includes a hole forming step and a rolling step of cold rolling the member to be machined on which the through hole is formed so as to deform the through hole.

In the above configuration, after the through hole is formed, the member to be processed in which the through hole is formed is rolled. When the member to be machined is rolled, the member to be machined is stretched. As a result, the through hole formed in the member to be processed is deformed so as to be large. That is, the cooling holes of the manufactured plate material can be enlarged. Therefore, the cooling efficiency of the manufactured plate material can be improved as compared with the case where rolling is not performed.
Further, a cooling hole is formed by enlarging the through hole in the rolling process. That is, the through hole formed in the through hole forming step is smaller than the cooling hole. As a result, the size of the through hole formed in the plate-shaped member to be processed can be reduced as compared with the case where the through hole having the same size as the cooling hole is formed. Therefore, since the amount of the member to be processed when forming the through hole is reduced, the processing time for forming the through hole can be shortened. Therefore, it is possible to shorten the time for manufacturing a plate material having cooling holes. In particular, for example, when a plurality of cooling holes are formed in the plate material, the processing time can be shortened by the number of the cooling holes, so that the time for producing the plate material having the cooling holes can be significantly shortened.
The plate material includes not only a flat plate member but also a curved member.

Further, in the method for manufacturing a plate material according to one aspect of the present disclosure, the through hole has a circular opening (21, 22) formed on the plate surface (11, 12) of the member to be processed. In the rolling step, rolling is performed so as to increase the ratio between the length of the opening in the first radial direction (X-axis direction) and the length in the second radial direction (Y-axis direction) orthogonal to the first radial direction. ..

In the above configuration, the shape of the cooling hole of the manufactured plate material has a large ratio of the length in the first radial direction and the length in the second radial direction. Thereby, the cooling efficiency of the manufactured plate material can be improved.
Further, since the size of the through hole to be formed can be reduced as compared with the case where the through hole having the same size as the cooling hole is formed, the processing time for forming the through hole can be shortened.

Further, in the method for manufacturing a plate material according to one aspect of the present disclosure, the through hole extends along the central axis (C3), and in the rolling step, the plate surface of the member to be processed and the through hole. Rolling is performed so that the angle formed by the central axis of the above is small.

In the above configuration, the shape of the cooling hole of the manufactured plate material is such that the angle formed by the plate surface of the member to be processed and the central axis of the through hole (hereinafter, referred to as “inclination angle”) is small. This increases the length of the cooling holes. Therefore, the cooling efficiency of the manufactured plate material can be improved.
Further, since the length of the through hole to be formed can be shortened as compared with the case of forming the through hole having the same length as the cooling hole, the processing time for forming the through hole can be shortened.
The angle formed by the plate surface and the central axis is an acute angle among the angles formed by the plate surface and the central axis.

Further, in the method for manufacturing a plate material according to one aspect of the present disclosure, in the rolling step, the first roller (50) that comes into contact with one surface (11) of the member to be processed and the other surface (12) of the member to be processed are used. Rolling is performed by a plurality of rollers including a second roller (51) that comes into contact with the first roller, and the rotation speeds of the first roller and the second roller are different.

In the above configuration, the rotation speeds of the first roller and the second roller for rolling are different. As a result, in the rolling process, the degree of extension differs between the one surface side of the work piece that comes into contact with the first roller and the other side of the work piece that comes into contact with the second roller. Therefore, since the relative position between the opening formed on one surface of the member to be processed and the opening formed on the other surface of the member to be processed changes, the inclination angle of the through hole also changes. Therefore, the inclination angle of the through hole can be easily changed. From the above, for example, when the inclination angle is changed so as to reduce the inclination angle of the through hole, the cooling efficiency of the plate material can be easily improved.

Further, in the method for manufacturing a plate material according to one aspect of the present disclosure, the rolling step includes a first roller in contact with one surface of the member to be processed and a second roller in contact with the other surface of the member to be processed. Rolling is performed by a plurality of rollers, and the first roller and the second roller have the same rotation direction.

In the above configuration, the rotation directions of the first roller and the second roller for rolling are the same. That is, the direction in which the member to be processed is moved differs between the first roller and the second roller. As a result, the extending direction is opposite between the one surface side of the work piece that comes into contact with the first roller and the other side of the work piece that comes into contact with the second roller. Therefore, since the relative position between the opening formed on one surface of the member to be processed and the opening formed on the other surface of the member to be processed changes significantly, the inclination angle of the through hole also changes significantly. Therefore, the inclination angle of the through hole can be easily changed. From the above, for example, when the inclination angle is changed so as to reduce the inclination angle of the through hole, the cooling efficiency of the plate material can be easily improved.

Further, the method for manufacturing a plate material according to one aspect of the present disclosure includes a annealing step in which the rolling step is performed a plurality of times and the member to be machined is annealed between the plurality of rolling steps.

In the above configuration, the rolling process is performed a plurality of times. As a result, the member to be processed can be gradually rolled and the through hole can be gradually deformed. Therefore, the processing accuracy can be improved.
In addition, the member to be machined is annealed during the rolling process. As a result, the stress remaining on the member to be processed by the rolling process can be removed. Therefore, it is possible to suppress a decrease in the strength of the member to be processed.

Further, in the method for manufacturing a plate material according to one aspect of the present disclosure, the rolling step includes a first roller in contact with one surface of the member to be processed and a second roller in contact with the other surface of the member to be processed. Rolling is performed by a plurality of rollers, and a high friction material having a friction coefficient higher than that of each roller is provided on the surfaces of the first roller and the second roller.

In the above configuration, a high friction material is provided on the surfaces of the first roller and the second roller. As a result, even when the reduction rate of the member to be processed is low (that is, even when the force for sandwiching the member to be processed by the first roller and the second roller is weak), the first roller and the second roller Idling can be suppressed.

The plate material according to one aspect of the present disclosure is a plate material having a cooling hole, the cooling hole is a through hole, and has an elliptical opening formed on the plate surface, and the opening is a minor axis. The length of the major axis is 1.5 times or more and 5 times or less with respect to the length of the above, and the length of the major axis is 0.01 mm or more and 0.5 mm. It is as follows.

In the above configuration, the cooling hole has an elliptical opening formed on the surface of the plate material. This facilitates the flow of fluid that has passed through the cooling holes and discharged from the openings along the surface. Therefore, since a fluid film can be easily formed on the surface of the plate material, the plate material can be suitably cooled. Therefore, the cooling efficiency can be improved.
Further, the opening has an elliptical shape in which the length of the major axis is 1.5 times or more and 5 times or less the length of the minor axis. Thereby, a fluid film can be suitably formed on the surface of the plate material. Therefore, the cooling efficiency can be further improved.

Further, in the plate material according to one aspect of the present disclosure, the length of the major axis is twice as long as the length of the minor axis in the opening.

In the above configuration, the opening has an elliptical shape in which the length of the major axis is twice the length of the minor axis. Thereby, a fluid film can be suitably formed on the surface of the plate material. Therefore, the cooling efficiency can be further improved.

10: Member to be processed 11: One side 12: Other side 20: Through hole 21: First opening (opening)
22: Second opening (opening)
30: Plate material 31: One side 32: Other side 40: Cooling hole 41: Third opening 42: Fourth opening 50: First roller 51: Second roller 60: Through hole 61: First opening 62: Second opening 80: Cooling hole 81: 3rd opening 82: 4th opening

Claims (9)

It is a method of manufacturing a plate material having cooling holes.
A through-hole forming process for forming a through-hole with respect to a member to be processed,
A method for producing a plate material, comprising: a rolling step of cold rolling the member to be processed in which the through hole is formed so as to deform the through hole. The through hole has a circular opening formed on the plate surface of the member to be processed.
The production of the plate material according to claim 1, wherein in the rolling step, rolling is performed so as to increase the ratio between the length of the opening in the first radial direction and the length in the second radial direction orthogonal to the first radial direction. Method. The through hole extends along the central axis and extends.
The method for manufacturing a plate material according to claim 1 or 2, wherein in the rolling step, rolling is performed so that the angle formed by the plate surface of the member to be processed and the central axis of the through hole is small. In the rolling step, rolling is performed by a plurality of rollers including a first roller that comes into contact with one surface of the member to be machined and a second roller that comes into contact with the other surface of the member to be machined.
The method for producing a plate material according to any one of claims 1 to 3, wherein the first roller and the second roller have different rotation speeds. In the rolling step, rolling is performed by a plurality of rollers including a first roller that comes into contact with one surface of the member to be machined and a second roller that comes into contact with the other surface of the member to be machined.
The method for manufacturing a plate material according to any one of claims 1 to 3, wherein the first roller and the second roller have the same rotation direction. The rolling process is performed a plurality of times.
The method for producing a plate material according to any one of claims 1 to 5, further comprising an annealing step of annealing the member to be processed between the plurality of rolling steps. In the rolling step, rolling is performed by a plurality of rollers including a first roller that comes into contact with one surface of the member to be machined and a second roller that comes into contact with the other surface of the member to be machined.
The method for producing a plate material according to any one of claims 1 to 6, wherein a high friction material having a friction coefficient higher than that of each roller is provided on the surfaces of the first roller and the second roller. A plate material with cooling holes
The cooling hole is a through hole and has an elliptical opening formed on the plate surface.
The opening has a major axis length of 1.5 times or more and 5 times or less with respect to a minor axis length, and a major axis length of 0.01 mm or more. And a plate material of 0.5 mm or less. The plate material according to claim 8, wherein the opening is twice the length of the major axis with respect to the length of the minor axis.

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