Method for forming refrigerant flow path, method for manufacturing structure having refrigerant flow path, and machine tool

Abstract

Provided are a method for forming a refrigerant flow path in which distortion of a case due to heat generated by friction stirring is suppressed, a method for manufacturing a structure having the refrigerant flow path, and a machine tool. 【Solution means】The method for forming a refrigerant flow path includes the steps of preparing a case having a recess defined by side walls and an end wall, and a groove formed on the outer surface of the end wall, and a cover covering the groove; joining the case and the cover by friction stirring so that a refrigerant flow path is formed by the groove and the cover; and discharging a coolant from an applicator to the case during execution of the friction stirring.

Description

Technical Field

[0001] The present invention relates to a method for forming a refrigerant flow path, a method for manufacturing a structure having the refrigerant flow path, and a machine tool.

Background Art

[0002] A friction stir welding apparatus provided with a cooling means is known.

[0003] As a related technique, Patent Document 1 discloses a friction stir welding apparatus. The friction stir welding apparatus described in Patent Document 1 includes a cooling means disposed above the base material. The cooling means includes a first cooling means for injecting a refrigerant at a front position on the welding line and a second cooling means for cooling the weld bead.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a method for forming a refrigerant flow path, a method for manufacturing a structure having the refrigerant flow path, and a machine tool in which distortion of a case due to heat generated by friction stir is suppressed.

Means for Solving the Problems

[0006] Embodiments of the present invention relate to the following method for forming a refrigerant flow path, a method for manufacturing a structure having the refrigerant flow path, and a machine tool.

[0007] (1) A step of preparing a case having a recess defined by a side wall and an end wall, and a groove formed on an outer surface of the end wall, and a cover covering the groove; A step of joining the case and the cover by friction stir welding such that a refrigerant flow path is formed by the groove portion and the cover; A step of discharging a coolant from an applicator to the case during execution of the friction stir welding; Comprising A method for forming a refrigerant flow path. (2) During execution of the friction stir welding, the applicator discharges the coolant only to the case among the case and the cover. The method for forming a refrigerant flow path according to (1) above. (3) The case prevents the coolant from reaching the cover. The method for forming a refrigerant flow path according to (2) above. (4) During execution of the friction stir welding, the coolant is applied to the inner surface of the case. The method for forming a refrigerant flow path according to any one of (1) to (3) above. (5) During execution of the friction stir welding, the coolant is applied to the outer surface of the side wall. The method for forming a refrigerant flow path according to any one of (1) to (4) above. (6) The joining step includes Butting and joining the case and the cover by the friction stir welding; Overlapping and joining the central portions of the case and the cover by the friction stir welding. Including The method for forming a refrigerant flow path according to any one of (1) to (5) above. (7) During execution of the friction stir welding, the end wall is supported by a backing member, During execution of the friction stir welding, at least one nozzle included in the applicator discharges the coolant to substantially the entire inner surface of the end wall excluding a portion of the inner surface of the end wall that contacts the backing member. The method for forming a refrigerant flow path according to any one of (1) to (6) above. (8) Further comprising a step of cutting a part of the joining region between the end wall and the cover. The method for forming a refrigerant flow path according to any one of (1) to (7) above. A step of preparing a case having a recess defined by side walls and end walls, and a groove formed on the outer surface of the end wall, and a cover covering the groove; A step of joining the case and the cover by friction stir welding such that a refrigerant flow path is formed by the groove and the cover; A step of discharging a coolant from an applicator to the case during execution of the friction stir welding; A step of disposing an object to be cooled in the recess; A step of fixing the lid to the case so that the recess is closed by the lid Comprising A method for manufacturing a structure having a refrigerant flow path. (10) A work support device that supports a case having a recess defined by side walls and end walls, and a groove formed on the outer surface of the end wall, and a cover covering the groove; A spindle capable of holding a friction stir welding tool for joining the case and the cover by friction stir welding such that a refrigerant flow path is formed by the groove and the cover; A support body that rotatably supports the spindle about a first axis; A rotation drive device that rotates the spindle about the first axis; A moving device that relatively moves the spindle and the support body with respect to the work support device; A supply device that supplies a coolant to the applicator; The applicator that discharges the coolant to the case during execution of the friction stir welding Comprising A machine tool. (11) When the case and the cover are supported by the work support device, the applicator is disposed to face the case without facing the cover The machine tool according to (10) above. (12) The applicator includes at least one nozzle that discharges the coolant to the inner surface of the case The machine tool according to (10) or (11) above. (13) The workpiece support device is a backrest member that supports the end wall of the case, and a holding member that holds the side wall of the case and includes the machine tool according to any one of (10) to (12) above. (14) Further includes a wall surrounding the processing area where the friction stirring is performed the machine tool according to any one of (10) to (13) above. (15) Includes a control device that controls the rotation drive device and the movement device, the spindle can hold a cutting tool that cuts at least one of the case and the cover, the control device is a joining mode in which the case and the cover are friction stir welded so that the refrigerant flow path is formed by the groove portion and the cover, and a cutting mode in which at least one of the case and the cover is cut using the cutting tool and can be selectively executed the machine tool according to any one of (10) to (14) above.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide a method for forming a refrigerant flow path in which distortion of the case due to heat generated by friction stirring is suppressed, a method for manufacturing a structure having the refrigerant flow path, and a machine tool.

Brief Description of the Drawings

[0009]

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Mode for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, a method for forming a refrigerant flow path, a method for manufacturing a structure having the refrigerant flow path, and a machine tool in the embodiment will be described. In the following description of the embodiment, parts and members having the same function are denoted by the same reference numerals, and repeated descriptions of the parts and members denoted by the same reference numerals are omitted.

[0011] (Definition of Terms) In this specification, the direction in which the case 7 and the cover 8 are pressed by the friction stir welding tool T1 is defined as the first direction DR1. Also, the direction opposite to the first direction DR1 is defined as the second direction DR2.

[0012] The first direction DR1 may be a downward direction (more specifically, a vertically downward direction) or a lateral direction (more specifically, a horizontal direction). For example, when the machine tool 1 is a vertical machining center, the first direction DR1 is a downward direction (more specifically, a vertically downward direction). For example, when the machine tool 1 is a horizontal machining center, the first direction DR1 is a lateral direction (more specifically, a horizontal direction).

[0013] (First Embodiment) Referring to FIGS. 1 to 29, a method for forming a refrigerant flow path and a method for manufacturing a structure having the refrigerant flow path in the first embodiment will be described. FIG. 1 is a schematic perspective view schematically showing an example of a case 7 and a cover 8 prepared in a preparation step. FIG. 2 is a schematic perspective view schematically showing an example of the case 7 prepared in the preparation step. FIG. 3 is a schematic perspective view schematically showing an example of the case 7 and the cover 8 prepared in the preparation step. FIG. 4 is a schematic cross-sectional view schematically showing a state where the cover 8 is disposed on the case 7. FIG. 5 is an enlarged view of a region surrounded by a dashed-dotted circle B in FIG. 4. FIG. 6 is a schematic cross-sectional view schematically showing a state where a joining step is being executed. FIG. 7 is a schematic perspective view schematically showing another example of the case 7 and the cover 8 prepared in the preparation step. FIG. 8 is a schematic perspective view schematically showing still another example of the case 7 and the cover 8 prepared in the preparation step. FIGS. 9 and 10 are schematic perspective views schematically showing a state where the case 7 and the cover 8 are supported by a work support device 3. FIG. 11 is a schematic cross-sectional view schematically showing a state where the case 7 and the cover 8 are supported by the work support device 3. FIG. 12 is a schematic cross-sectional view schematically showing a state where a joining step is being executed. FIG. 13 is a schematic cross-sectional view schematically showing a state where a joining step is being executed. FIG. 14 is a schematic cross-sectional view schematically showing a state where the height of a first end 42a-1 of a first support column 42-1 can be adjusted. FIG. 15 is a schematic cross-sectional view schematically showing a state where the height of a second end 42a-2 of a second support column 42-2 can be adjusted. FIG. 16 is a schematic front view schematically showing a state where the case 7 and the cover 8 are supported by the work support device 3. FIGS. 17 to 20 are schematic perspective views schematically showing a state where a joining step is being executed. FIG. 21 is a view for explaining a first path PA. FIG. 22 is a schematic cross-sectional view schematically showing a state where a joining step is being executed. FIG. 23 is a schematic perspective view schematically showing an example of a jig 4 for supporting the case 7 and the cover 8. FIG. 24 is a schematic cross-sectional view schematically showing a state where a joining step is being executed. FIG. 25 is a schematic front view schematically showing a state where a cutting step is being executed. FIG. 26 is a schematic perspective view schematically showing a state where a cutting step is being executed.FIG. 27 is a schematic perspective view schematically showing a state in which an object OB to be cooled is disposed in the recess 74 of the case 7. FIG. 28 is a schematic perspective view schematically showing a state in which the lid CB is attached to the case 7. FIG. 29 is a flowchart showing an example of a method for forming a refrigerant flow path in the first embodiment.

[0014] As illustrated in FIG. 1, the method for forming a refrigerant flow path in the first embodiment includes a step of preparing the case 7 and the cover 8 (hereinafter referred to as the "preparation step").

[0015] As illustrated in FIG. 2, the case 7 prepared in the preparation step has a recess 74 defined by the side wall 71 and the end wall 73.

[0016] As illustrated in FIG. 1, the case 7 prepared in the preparation step has a groove portion 73v formed on the outer surface 73t of the end wall 73. In the example described in FIGS. 1 and 2, the groove portion 73v is disposed on the opposite side of the recess 74 with respect to the end wall 73. More specifically, the groove portion 73v is formed on the outer surface 73t of the end wall 73, and the inner surface 73n of the end wall 73 defines the bottom surface of the recess 74.

[0017] As illustrated in FIGS. 1 and 3, the cover 8 prepared in the preparation step can cover the groove portion 73v described above.

[0018] As illustrated in FIG. 6, the method for forming a refrigerant flow path in the first embodiment includes a step of joining the case 7 and the cover 8 by friction stir welding (hereinafter referred to as the "joining step") so that the refrigerant flow path 91 is formed by the groove portion 73v and the cover 8.

[0019] As illustrated in FIG. 6, the method for forming a refrigerant flow path in the first embodiment includes a step of discharging the coolant L1 from the applicator 60 to the case 7 during the execution of the friction stir welding (hereinafter referred to as the "coolant discharge step").

[0020] In the coolant discharge step, during the execution of friction stir welding, coolant L1 is discharged onto at least one of the inner surface 71n of the side wall 71, the inner surface 73n of the end wall 73, and the outer surface 71t of the side wall 71.

[0021] In the first embodiment, since coolant L1 is discharged onto the case 7 during the execution of friction stir welding, distortion of the case 7 due to the heat generated by friction stir welding is suppressed.

[0022] In the example shown in FIG. 6, during the execution of friction stir welding, the applicator 60 (more specifically, at least one nozzle 61) discharges coolant L1 only onto the case 7 out of the case 7 and the cover 8. More specifically, during the execution of friction stir welding, the applicator 60 (more specifically, at least one nozzle 61) discharges coolant L1 onto the case 7 so that the coolant L1 does not reach the cover 8.

[0023] If coolant L1 remains in the refrigerant flow path 91, the product or part manufactured by friction stir welding may be judged as non - compliant during inspection. Therefore, it is necessary to execute a step of cleaning the refrigerant flow path 91 (hereinafter referred to as the "cleaning step") and a step of drying the refrigerant flow path 91.

[0024] On the other hand, when coolant L1 does not reach the cover 8 during the execution of friction stir welding, the coolant L1 does not enter the groove portion 73v (or the refrigerant flow path 91) through the gap between the case 7 and the cover 8. Therefore, the cleaning step of the refrigerant flow path 91 becomes unnecessary or the cleaning step is simplified.

[0025] As illustrated in FIG. 6, the case 7 may prevent the coolant L1 from reaching the cover 8.

[0026] (Optional additional configuration) Subsequently, with reference to FIGS. 1 to 29, an optional additional configuration that can be adopted in the method for forming a refrigerant flow path in the first embodiment will be described.

[0027] (Preparation step) In the first step ST1, the case 7 and the cover 8 covering the groove portion 73v of the case 7 are prepared. The first step ST1 is a preparation process.

[0028] As illustrated in FIG. 2, the case 7 prepared in the preparation process (the first step ST1) has a side wall 71, an end wall 73, and a recess 74 defined by the side wall 71 and the end wall 73. As illustrated in FIG. 1, the case 7 prepared in the preparation process (the first step ST1) has a groove portion 73v formed on the outer surface 73t of the end wall 73. The groove portion 73v may be subdivided by at least one protrusion 73p.

[0029] In the example shown in FIG. 2, the side wall 71 and the end wall 73 are formed by integral molding. In the example shown in FIG. 2, the case 7 has a box shape. In the example shown in FIG. 2, the end wall 73 is a bottom wall 730 that defines the bottom of the recess 74.

[0030] In the example shown in FIG. 2, the side wall 71 includes a first side wall 71-1 and a second side wall 71-2. The second side wall 71-2 is disposed opposite to the first side wall 71-1.

[0031] The side wall 71 may include a first side wall 71-1, a second side wall 71-2, a third side wall 71-3, and a fourth side wall 71-4. In the example shown in FIG. 2, the third side wall 71-3 connects the first side wall 71-1 and the second side wall 71-2. In the example shown in FIG. 2, the fourth side wall 71-4 connects the first side wall 71-1 and the second side wall 71-2. Also, the fourth side wall 71-4 is disposed opposite to the third side wall 71-3.

[0032] As illustrated in FIG. 4, the end wall 73 of the case 7 may have a step portion 731 disposed opposite to the outer edge portion 81 of the cover 8.

[0033] The side wall 71 may have a protruding portion (for example, a flange portion 72) held by a holding member 50 (see FIG. 6). The first side wall 71-1 may have a first flange portion 72-1 held by a first holding member 51a (see FIG. 6). The second side wall 71-2 may have a second flange portion 72-2 held by a second holding member 51b (see FIG. 6). In the example shown in FIG. 2, each of the first flange portion 72-1 and the second flange portion 72-2 constitutes a part of the flange portion 72.

[0034] In the example shown in FIG. 2, the case 7 has a recess 74 capable of receiving an object to be cooled. The object to be cooled received in the recess 74 is, for example, an electrical device that generates heat when an electric current flows through it. The case 7 may be an automotive part (for example, a part of an electric vehicle) mounted on an automobile with the electrical device housed therein. The electrical device that generates heat when an electric current flows through it is, for example, housed in the recess 74 while being in contact with the end wall 73.

[0035] The object to be cooled (more specifically, the electrical device) received in the recess 74 is, for example, an inverter (more specifically, a device having a circuit for converting a direct current into an alternating current), a converter (more specifically, an AC-DC converter for converting an alternating current into a direct current, or a DC-DC converter for converting a direct voltage into another direct voltage), a battery, a charger for charging the battery, a control unit such as an engine control unit, or a substrate on which a plurality of electronic components are arranged.

[0036] The case 7 may be provided with a mounting portion 75 to which a lid CB (see FIG. 28) covering the recess 74 can be attached. In the example shown in FIG. 2, the mounting portion 75 has a hole portion 75h into which a bolt is inserted. The mounting portion 75 may be formed by casting. The outer shape of the mounting portion 75 may be formed by casting, and the hole portion 75h of the mounting portion 75 may be formed by machining (more specifically, drilling).

[0037] The case 7 prepared in the preparation process (first step ST1) is, for example, a cast part. The side wall 71 of the case 7, the end wall 73 of the case 7, and the recess 74 of the case 7 may be formed by casting. Alternatively, the side wall 71, the end wall 73, and the recess 74 may be formed by cutting a block with a cutting tool.

[0038] The groove 73v (see FIG. 1) of the end wall 73 may be formed by casting. Alternatively, the groove 73v may be formed by cutting the end wall 73 with a cutting tool.

[0039] The case 7 prepared in the preparation process (first step ST1) may include a first port 79a connected to the groove 73v. Additionally, the case 7 prepared in the preparation process (first step ST1) may include a second port 79b connected to the groove 73v. One of the first port 79a and the second port 79b functions as an inlet port for supplying refrigerant to the refrigerant flow path 91, and the other of the first port 79a and the second port 79b functions as an outlet port for discharging refrigerant from the refrigerant flow path 91. Alternatively, as illustrated in FIG. 7, the cover 8 may include a second port 89b connected to the groove 73v. Further alternatively, as illustrated in FIG. 8, the cover 8 may include a first port 89a connected to the groove 73v and a second port 89b connected to the groove 73v.

[0040] Alternatively, the first port may be formed by friction stir welding the case 7 and the cover 8. In this case, the first port is formed by a part of the case 7 and a part of the cover 8. The second port 79b may be formed by friction stir welding the case 7 and the cover 8. In this case, the second port is formed by a part of the case 7 and a part of the cover 8.

[0041] When there is a possibility that the cooling liquid L1 enters from the first port 79a into the groove portion 73v, the first port 79a may be covered with a lid during friction stir welding. When there is a possibility that the cooling liquid L1 enters from the second port 79b into the groove portion 73v, the second port 79b may be covered with a lid during friction stir welding.

[0042] The case 7 is, for example, made of metal. The main component of the material of the case 7 is, for example, aluminum. In other words, the case 7 is made of aluminum or an aluminum alloy.

[0043] As illustrated in FIG. 1, the cover 8 prepared in the preparation step (first step ST1) may have a flat plate shape. Alternatively, the cover 8 may have a concave portion or a convex portion. As illustrated in FIG. 7, the cover 8 may have a second port 89b. As illustrated in FIG. 8, the cover 8 may have a first port 89a and a second port 89b.

[0044] As illustrated in FIGS. 1 and 3, the method for forming the refrigerant flow path in the first embodiment includes a step of disposing the cover 8 on the case 7 so that the above-described groove portion 73v is covered with the cover 8. More specifically, the preparation step (first step ST1) includes disposing the cover 8 on the case 7 so that the above-described groove portion 73v is covered with the cover 8.

[0045] The preparation step (first step ST1) may include disposing the cover 8 on the case 7 attached to the work support device 3 (see FIG. 6). Alternatively, the preparation step (first step ST1) may include attaching the case 7 to the work support device 3 after the cover 8 is disposed on the case 7.

[0046] Attaching the case 7 to the work support device 3 may be performed manually or using a robot. Disposing the cover 8 on the case 7 may be performed manually or using a robot.

[0047] As illustrated in FIG. 5, arranging the cover 8 on the case 7 may include arranging the outer edge portion 81 of the cover 8 to face the stepped portion 731 of the end wall 73. More specifically, the outer edge portion 81 of the cover 8 may be arranged to face the stepped portion 731 of the end wall 73 by inserting the cover 8 into the recess 738 formed in the end wall 73 of the case 7.

[0048] As illustrated in FIGS. 9 to 11, the preparation step (first step ST1) may include moving the detachment prevention member 67 from the retracted position P2 (see FIG. 9) away from the cover 8 to the advanced position P1 (see FIGS. 10 and 11) in contact with the cover 8 after the cover 8 is arranged on the case 7. When the detachment prevention member 67 comes into contact with the cover 8, the cover 8 is prevented from coming off the case 7.

[0049] In the example shown in FIG. 11, the work support device 3 includes a jig 4 to which the case 7 is attached. In the example shown in FIG. 11, the work support device 3 (more specifically, the jig 4) includes a backrest member 40 that supports the case 7.

[0050] As illustrated in FIG. 13, the backrest member 40 receives the pressing force from the friction stir welding tool T1 through the case 7. In other words, when the case 7 is friction stir welded by the friction stir welding tool T1, the backrest member 40 supports the case 7 against the pressing force received by the case 7 from the friction stir welding tool T1.

[0051] In the example shown in FIG. 13, the backrest member 40 supports the end wall 73 of the case 7 (more specifically, the inner surface 73n of the end wall 73 of the case 7).

[0052] As illustrated in FIG. 11, the backrest member 40 may have a first support column 42-1 that supports the case 7 (more specifically, the end wall 73 of the case 7). As illustrated in FIG. 14, the first support column 42-1 may be telescopic so that the position of the tip of the first support column 42-1 can be adjusted. By adjusting the position of the tip of the first support column 42-1, the case 7 is preferably supported by the tip of the first support column 42-1.

[0053] As illustrated in FIG. 11, the lining member 40 may have a second support column 42-2 that supports the case 7 (more specifically, the end wall 73 of the case 7). As illustrated in FIG. 15, the second support column 42-2 may be telescopic so that the position of the tip of the second support column 42-2 can be adjusted. By adjusting the position of the tip of the second support column 42-2, the case 7 is preferably supported by the tip of the second support column 42-2.

[0054]

[0053] As illustrated in FIG. 11, the length of the second support column 42-2 may be different from the length of the first support column 42-1. In this case, the plurality of support columns 42 including the first support column 42-1 and the second support column 42-2 can preferably support the case 7 having a relatively complex shape.

[0055] The jig 4 may include a base 64 that supports the lining member 40 (for example, the plurality of support columns 42 including the first support column 42-1 and the second support column 42-2). In the example shown in FIG. 16, the base 64 is fixed to the table 31 of the work support device 3.

[0056] As illustrated in FIG. 16, the method for forming the refrigerant flow path in the first embodiment includes a step of attaching the case 7 to the work support device 3 (more specifically, the jig 4). More specifically, the preparation step (first step ST1) includes attaching the case 7 to the work support device 3 (more specifically, the jig 4).

[0057]

[0054] In the example shown in FIG. 11, the work support device 3 (more specifically, the jig 4) includes a holding member 50 that holds the case 7. In this case, the attachment of the case 7 to the work support device 3 (more specifically, the jig 4) is performed by attaching the case 7 to the holding member 50.

[0058] In the example described in FIG. 11, the holding member 50 holds the side wall 71 of the case 7. The holding member 50 may include a first holding member 51a that holds the first side wall 71-1 of the case 7 and a second holding member 51b that holds the second side wall 71-2 of the case 7.

[0059] The holding member 50 may hold the flange portion 72 of the side wall 71 of the case 7. As illustrated in FIG. 11, the first holding member 51a may hold the first flange portion 72-1 of the first side wall 71-1. Also, the second holding member 51b may hold the second flange portion 72-2 of the second side wall 71-2.

[0060] As illustrated in FIGS. 9 and 10, the work support device 3 (more specifically, the jig 4) may include the above-described detachment prevention member 67. Also, the work support device 3 (more specifically, the jig 4) may include an actuator 68 that moves the above-described detachment prevention member 67 from the above-described retracted position P2 to the above-described advanced position P1.

[0061] In the example described in FIGS. 9 and 10, the detachment prevention member 67 includes a first detachment prevention member 67-1 and a second detachment prevention member 67-2. The work support device 3 (more specifically, the jig 4) may include a first actuator 68-1 that moves the first detachment prevention member 67-1 between a first advanced position P1-1 that contacts the cover 8 and a first retracted position P2-1 that is separated from the cover 8. Also, the work support device 3 (more specifically, the jig 4) may include a second actuator 68-2 that moves the second detachment prevention member 67-2 between a second advanced position P1-2 that contacts the cover 8 and a second retracted position P2-2 that is separated from the cover 8.

[0062] (Bonding process) In the second step ST2, the case 7 and the cover 8 are joined by friction stir so that the refrigerant flow path 91 is formed by the groove portion 73v and the cover 8. The second step ST2 is a bonding process.

[0063] In the examples described in FIGS. 12 and 13, the joining step (second step ST2) is performed with the case 7 supported by the work support device 3 (more specifically, the backing member 40). More specifically, during the execution of friction stir welding, the end wall 73 of the case 7 (more specifically, the inner surface 73n of the end wall 73) is supported by the backing member 40. By supporting the end wall 73 of the case 7 by the backing member 40, distortion of the end wall 73 caused by pressing of the end wall 73 by the friction stir welding tool T1 is suppressed.

[0064] In the example described in FIG. 13, the joining step (second step ST2) is performed with the case 7 held by the work support device 3 (more specifically, the holding member 50). More specifically, during the execution of friction stir welding, the side wall 71 of the case 7 is held by the holding member 50. By holding the case 7 by the holding member 50 during the execution of friction stir welding, displacement of the case 7 is prevented. Further, when the side wall 71 of the case 7 is held by the holding member 50, the friction stir welding tool T1 that relatively moves with respect to the holding member 50 during friction stir welding does not interfere with the holding member 50.

[0065] The joining step (second step ST2) includes relatively moving the rotating friction stir welding tool T1 with respect to the case 7 and the cover 8 so that the case 7 and the cover 8 are joined by friction stir welding.

[0066] In the example described in FIG. 13, the joining step (second step ST2) includes relatively moving the rotating friction stir welding tool T1 with respect to the case 7 and the cover 8 while the friction stir welding tool T1 is pressing the cover 8 and the end wall 73 of the case 7.

[0067] In the examples described in FIGS. 17 to 20, the joining step (second step ST2) includes relatively moving the rotating friction stir welding tool T1 along the first path PA (see FIG. 21) with respect to the case 7 and the cover 8 so that the case 7 and the cover 8 are joined by friction stir welding.

[0068] In the example shown in FIG. 19, the joining step (second step ST2) includes relatively moving the rotating friction stir joining tool T1 along the boundary PA1 between the case 7 and the cover 8 with respect to the case 7 and the cover 8. In other words, the above-described first path PA includes the boundary PA1 between the case 7 and the cover 8. In this case, the case 7 and the cover 8 are butt-joined by friction stir. Also, the boundary PA1 between the case 7 and the cover 8 is flattened.

[0069] In the example shown in FIG. 13, the joining step (second step ST2) includes butt-joining the stepped portion 731 of the end wall 73 (see FIG. 5) and the outer edge portion 81 of the cover 8 (see FIG. 5) by friction stir. In other words, the above-described first path PA includes the boundary between the stepped portion 731 of the case 7 and the outer edge portion 81 of the cover 8.

[0070] In the example shown in FIG. 13, in a state where the case 7 is inverted, the case 7 is supported by the work support device 3 (more specifically, the backing member 40). Some of the plurality of support columns 42 may support the end wall 73 of the case 7 in the vicinity of the side wall 71.

[0071] As can be understood from FIGS. 1 and 21, the first path PA may include a path PA2 along the region where the case 7 and the cover 8 overlap. In the example shown in FIG. 21, the first path PA includes a path PA2-1 passing through the central portion 83 of the cover 8. In this case, as illustrated in FIG. 22, the joining step (second step ST2) includes relatively moving the rotating friction stir joining tool T1 along the surface of the cover 8 with respect to the cover 8 in a state where the friction stir joining tool T1 presses the central portion 83 of the cover 8 toward the end wall 73 of the case 7. Thus, the case 7 and the central portion 83 of the cover 8 are overlapped and joined by friction stir.

[0072] When the case 7 and the central portion 83 of the cover 8 are overlapped and joined, it is possible to suppress the central portion 83 of the cover 8 from being distorted outward due to the pressure of the refrigerant flowing through the refrigerant flow path 91 when the refrigerant flow path 91 is used.

[0073] In the example described in FIG. 22, at least one of the plurality of support columns 42 is located vertically below the central portion 83 of the cover 8. More specifically, when the case 7 and the central portion 83 of the cover 8 are overlapped and joined, at least one of the plurality of support columns 42 supports the end wall 73 of the case 7 vertically below the friction stir welding tool T1.

[0074] In the example described in FIG. 21, the first path PA includes both the boundary PA1 between the case 7 and the cover 8 and the path PA2-1 passing through the central portion 83 of the cover 8. In this case, the case 7 and the cover 8 are abutted and joined by friction stir, and the central portion 83 of the case 7 and the cover 8 are overlapped and joined by friction stir.

[0075] As illustrated in FIG. 13, the friction stir is performed while the case 7 and the cover 8 are pressed in the first direction DR1 by the friction stir welding tool T1. The work support device 3 (more specifically, the backing member 40) supports the case 7 against the pressing force received by the case 7 and the cover 8 from the friction stir welding tool T1.

[0076] In the example described in FIG. 11, the first direction DR1 coincides with the direction from the end wall 73 of the case 7 toward the internal space SP of the recess 74 of the case 7. In the example described in FIG. 11, the end wall 73 is a wall disposed at the end of the side wall 71 on the second direction DR2 side. In the example described in FIG. 11, the end wall 73 is connected to the end of the first side wall 71-1 on the second direction DR2 side and is connected to the end of the second side wall 71-2 on the second direction DR2 side.

[0077] As illustrated in FIG. 17, the above-described friction stir may be started in a state where the above-described detachment prevention member 67 is in contact with the cover 8 at the advancement position P1. In this case, when the friction stir is started, the cover 8 is prevented from detaching from the case 7.

[0078] The joining step (second step ST2) may include moving the detachment prevention member 67 (for example, the first detachment prevention member 67-1) from the above-described advanced position P1 to the above-described retracted position P2 in response to the friction stir welding tool T1 approaching the detachment prevention member 67 (for example, the first detachment prevention member 67-1). Further, the joining step (second step ST2) may include moving the detachment prevention member 67 (for example, the first detachment prevention member 67-1) from the above-described retracted position P2 to the above-described advanced position P1 in response to the friction stir welding tool T1 moving away from the above-described advanced position P1.

[0079] More specifically, as illustrated in FIGS. 17 and 18, the joining step (second step ST2) may include retracting the first detachment prevention member 67-1 from the first advanced position P1-1 to the first retracted position P2-1 so that the first detachment prevention member 67-1 moves away from the cover 8 in response to the friction stir welding tool T1 approaching the first detachment prevention member 67-1. As illustrated in FIGS. 18 and 19, the joining step (second step ST2) may include returning the first detachment prevention member 67-1 from the first retracted position P2-1 to the first advanced position P1-1 in response to the friction stir welding tool T1 moving away from the above-described first advanced position P1-1.

[0080] As illustrated in FIGS. 17 and 18, the joining step (second step ST2) may include retracting the first detachment prevention member 67-1 so that the first detachment prevention member 67-1 moves away from the cover 8 while the second detachment prevention member 67-2 is maintained at the above-described second advanced position P1-2 in response to the friction stir welding tool T1 approaching the first detachment prevention member 67-1. Further, as illustrated in FIGS. 19 and 20, the joining step (second step ST2) may include retracting the second detachment prevention member 67-2 so that the second detachment prevention member 67-2 moves away from the cover 8 while the first detachment prevention member 67-1 is maintained at the above-described first advanced position P1-1 in response to the friction stir welding tool T1 approaching the second detachment prevention member 67-2.

[0081] (Coolant discharge step) In the third step ST3, the coolant L1 is discharged into the case 7. The third step ST3 is a coolant discharge process. The coolant discharge process (the third step ST3) is executed during the execution of friction stir welding. In other words, the coolant discharge process (the third step ST3) is executed during the execution of the joining process (the second step ST2).

[0082] The coolant discharge process (the third step ST3) may be started before the start of the joining process (the second step ST2). Alternatively, the coolant discharge process (the third step ST3) may be started simultaneously with the joining process (the second step ST2). The coolant discharge process (the third step ST3) may be started manually or based on a command from the control device.

[0083] The execution of the coolant discharge process (the third step ST3) may be stopped after the completion of the joining process (the second step ST2). Alternatively, the execution of the coolant discharge process (the third step ST3) may be stopped simultaneously with the completion of the joining process (the second step ST2). The execution of the coolant discharge process (the third step ST3) may be stopped by manual operation or based on a command from the control device.

[0084] During the execution of friction stir welding, by discharging the coolant L1 into the case 7, distortion of the case 7 due to the heat generated by friction stir welding is suppressed.

[0085] In the example shown in FIG. 13, during the execution of friction stir welding, the coolant L1 is applied to the inner surface 7n of the case 7 (more specifically, the inner surface 7n of the case 7 that defines the recess 74). More specifically, during the execution of friction stir welding, the applicator 60 (more specifically, at least one nozzle 61) discharges the coolant L1 onto the inner surface 7n of the case 7.

[0086] The inner surface 7n of the case 7 and the cover 8 covering the groove portion 73v are separated by the side wall 71 of the case 7 and the end wall 73 of the case 7. Therefore, the coolant L1 discharged toward the inner surface 7n of the case 7 does not reach the cover 8. For this reason, the coolant L1 discharged toward the inner surface 7n of the case 7 does not enter the groove portion 73v (or the refrigerant flow path 91) through the gap between the case 7 and the cover 8.

[0087] In the example described in FIG. 13, during the execution of friction stir welding, the coolant L1 is applied to the inner surface 73n of the end wall 73. By applying the coolant L1 to the inner surface 73n of the end wall 73, distortion of the end wall 73 due to the heat generated by friction stir welding is suppressed.

[0088] When the coolant L1 is applied to the inner surface 73n of the end wall 73 (more specifically, when the coolant L1 is sprayed onto the inner surface 73n of the end wall 73), the side wall 71 prevents the coolant L1 from reaching the cover 8. More specifically, the side wall 71 prevents the coolant L1 from swirling toward the cover 8. For this reason, the coolant L1 applied to the inner surface 73n of the end wall 73 does not enter the groove portion 73v (or the refrigerant flow path 91) through the gap between the case 7 and the cover 8.

[0089] In the example described in FIG. 13, during the execution of friction stir welding, the end wall 73 is supported by the backing member 40, and the coolant L1 is applied to the inner surface 73n of the end wall 73. In this case, distortion of the end wall 73 due to friction stir welding is suppressed by both the backing member 40 and the coolant L1.

[0090] In the example described in FIG. 13, during the execution of friction stir welding, coolant L1 is discharged from at least one nozzle 61 toward the inner surface 7n of the case 7 (more specifically, the inner surface 73n of the end wall 73). During the execution of friction stir welding, at least one nozzle 61 may spray the coolant L1 toward the inner surface 7n of the case 7 (more specifically, the inner surface 73n of the end wall 73). At least one nozzle 61 may be attached to a backing member 40 (for example, the first support column 42-1) that supports the end wall 73. As illustrated in FIG. 23, a plurality of nozzles 61 that discharge coolant onto the inner surface 7n of the case 7 may be attached to a backing member 40 (for example, the first support column 42-1) that supports the end wall 73.

[0091] As illustrated in FIG. 24, at least one nozzle 61 (more specifically, a plurality of nozzles 61) included in the applicator 60 may discharge the coolant L1 onto substantially the entire inner surface 73n of the end wall 73 excluding the portion that contacts the backing member 40.

[0092] When the coolant L1 reaches substantially the entire inner surface 73n of the end wall 73 excluding the portion that contacts the backing member 40, regardless of the position where the friction stir welding tool T1 performs friction stir welding, distortion of the end wall 73 due to heat generated by friction stir welding is suppressed. Therefore, it is not necessary to move at least one nozzle 61 in accordance with a change in the position where the friction stir welding tool T1 performs friction stir welding.

[0093] Alternatively, or additionally, as illustrated in FIG. 24, during the execution of friction stir welding, coolant L1 may be discharged from at least one nozzle 61 toward the inner surface 71n of the side wall 71.

[0094] In the example described in FIG. 13, during the execution of friction stir welding, coolant L1 is applied to the outer surface 71t of the side wall 71. More specifically, during the execution of friction stir welding, the applicator 60 discharges the coolant L1 onto the outer surface 71t of the side wall 71.

[0095] The coolant L1 applied to the outer surface 71t of the side wall 71 cools the side wall 71. Further, when the side wall 71 is cooled, the end wall 73 is also indirectly cooled. Thus, distortion of the end wall 73 (particularly, the outer edge portion of the end wall 73) due to the heat generated by friction stirring is suppressed.

[0096] The outer surface 71t of the side wall 71 of the case 7 is separated from the cover 8 covering the groove portion 73v. Thus, the coolant L1 applied to the outer surface 71t of the side wall 71 of the case 7 does not reach the cover 8. In the example shown in FIG. 13, the coolant L1 discharged toward the outer surface 71t of the side wall 71 of the case 7 does not enter the groove portion 73v (or the refrigerant flow path 91) through the gap between the case 7 and the cover 8.

[0097] In the example shown in FIG. 13, during the execution of friction stirring, the coolant L1 is discharged from at least one nozzle 62 onto the outer surface 71t of the side wall 71. In this specification, in order to distinguish between the nozzle 61 that discharges the coolant L1 onto the inner surface 7n of the case 7 and the nozzle 62 that discharges the coolant L1 onto the outer surface 71t of the side wall 71 of the case 7, the latter is referred to as the "outer nozzle 62".

[0098] In the example shown in FIG. 13, at least one outer nozzle 62 is supported by the work support device 3 (more specifically, the jig 4).

[0099] As illustrated in FIG. 13, during the execution of friction stirring, the coolant L1 may be applied to both the inner surface 7n of the case 7 (more specifically, the inner surface 73n of the end wall 73) and the outer surface 71t of the side wall 71 of the case 7. Alternatively, as illustrated in FIG. 24, during the execution of friction stirring, the coolant L1 may be applied only to the inner surface 7n of the case 7. Further alternatively, during the execution of friction stirring, the coolant L1 may be applied only to the outer surface 71t of the side wall 71 of the case 7.

[0100] The coolant L1 is, for example, a water-soluble coolant liquid. The main component of the water-soluble coolant liquid is, for example, water. The water-soluble coolant liquid may contain a water-soluble oil agent (for example, a water-soluble cutting oil agent or a water-soluble grinding oil agent) and / or a surfactant.

[0101] The coolant L1 may be a liquid having the same components as the cutting fluid applied to the workpiece (for example, the case 7 or other workpieces) when the workpiece (for example, the case 7 or other workpieces) is being machined.

[0102] (Cutting process) The method for forming the refrigerant flow path in the first embodiment may include a step of cutting at least one of the case 7 and the cover 8 with a cutting tool T2 (hereinafter referred to as the "cutting step"). In other words, in the fourth step ST4, at least one of the case 7 and the cover 8 may be cut with the cutting tool T2.

[0103] In the examples shown in FIGS. 25 and 26, the cutting step (the fourth step ST4) is performed after the execution of the joining step (in other words, after the friction stir joining of the case 7 and the cover 8 is completed). In this case, after the execution of the joining step (the second step ST2) and before the execution of the cutting step (the fourth step ST4), the friction stir joining tool T1 held by the spindle 151 described later may be replaced with the cutting tool T2. The replacement of the friction stir joining tool T1 held by the spindle 151 with the cutting tool T2 may be performed by the tool changer 19 or manually.

[0104] In the example shown in FIG. 26, the cutting step (the fourth step ST4) includes cutting a part of the joining region JR between the end wall 73 of the case 7 and the cover 8.

[0105] The cutting step (the fourth step ST4) may include removing the burrs generated during friction stir with the cutting tool T2 (for example, the milling tool T2-1).

[0106] Alternatively, or additionally, the cutting process (fourth step ST4) may include forming a hole (e.g., hole 75h of the mounting portion 75 shown in FIG. 2) in the case 7 and / or the cover 8 by a cutting tool T2 (e.g., a hole drilling tool T2-2). Alternatively, or additionally, the cutting process (fourth step ST4) may include forming a thread in the above-described hole (e.g., the hole formed in the case 7) by a cutting tool T2 (e.g., a tap tool).

[0107] In the example described in FIG. 25, the cutting process (fourth step ST4) includes relatively moving the rotating cutting tool T2 along the second path PB with respect to the case 7 and the cover 8 such that at least one of the case 7 and the cover 8 is cut by the cutting tool T2.

[0108] The second path PB may overlap with the above-described first path PA. For example, the rotating cutting tool T2 (e.g., a milling tool T2-1) may relatively move with respect to the case 7 and the cover 8 along the second path PB that overlaps with the above-described first path PA. In this case, the burrs generated during friction stir welding are removed by the cutting tool T2 (e.g., a milling tool T2-1).

[0109] The second path PB may include a path parallel to the first direction DR1. For example, by moving the rotating cutting tool T2 (e.g., a hole drilling tool T2-2) along the second path PB, a hole may be formed in the case 7 and / or the cover 8 by the cutting tool T2 (e.g., a hole drilling tool T2-2). Alternatively, or additionally, by moving the rotating cutting tool T2 (e.g., a tap tool) along the second path PB, a thread may be formed in the above-described hole (e.g., the hole formed in the case 7) by the cutting tool T2 (e.g., a tap tool).

[0110] In the example described in FIG. 26, the cutting process (fourth step ST4) is executed after the joining process (second step ST2). Alternatively, or additionally, the cutting process (fourth step ST4) may be executed before the joining process (second step ST2). Further alternatively, the cutting process (fourth step ST4) may be omitted.

[0111] (Method for manufacturing the structure EB having a refrigerant flow path) The method for manufacturing the structure EB having a refrigerant flow path in the first embodiment includes, in addition to the above-described first step ST1 to third step ST3 (or in addition to the above-described first step ST1 to fourth step ST4), (1) a step of disposing the object OB to be cooled in the recess 74 of the case 7 (see FIG. 27); and (2) a step of fixing the lid CB to the case 7 so that the recess 74 of the case 7 is closed by the lid CB (see FIG. 28).

[0112] Disposing the object OB to be cooled in the recess 74 of the case 7 is executed after the friction stir joining of the case 7 and the cover 8 is completed. Disposing the object OB to be cooled in the recess 74 of the case 7 may be executed after the cutting process (fourth step ST4). Since the object to be cooled has been described, repeated description thereof will be omitted.

[0113] The step of fixing the lid CB to the case 7 is executed after the step of disposing the object OB to be cooled in the recess 74 of the case 7. Fixing the lid CB to the case 7 may be performed by inserting a bolt into the hole 75h (see FIG. 27). Alternatively, fixing the lid CB to the case 7 may be performed by friction stir joining.

[0114] (Machine tool 1) Referring to FIGS. 1 to 36, the machine tool 1 in the first embodiment will be described. FIG. 30 is a schematic front view schematically showing a part of the machine tool 1 in the first embodiment. FIG. 31 is a schematic perspective view schematically showing an example of the jig 4 that supports the case 7 and the cover 8. FIG. 32 is a view for explaining an example of the spray nozzle SN. FIGS. 33 and 34 are schematic perspective views schematically showing the machine tool 1 in the first embodiment. FIG. 35 is a schematic front view schematically showing a part of the machine tool 1 in the first embodiment. FIG. 36 is a view schematically showing a state in which the control device 2 can control a plurality of controlled devices.

[0115] As illustrated in FIG. 30, the machine tool 1 includes a work support device 3, a spindle 151, a support 153, a rotation drive device 16, a moving device 17, a supply device 12, and an applicator 60.

[0116] As illustrated in FIG. 30, the work support device 3 supports the case 7 and the cover 8. As illustrated in FIG. 11, the case 7 has a recess 74 defined by a side wall 71 and an end wall 73, and a groove 73v formed on an outer surface 73t of the end wall 73. The cover 8 covers the groove 73v of the case 7. Since the case 7 and the cover 8 have been described, repetitive descriptions thereof will be omitted.

[0117] As illustrated in FIG. 30, the spindle 151 can hold the friction stir welding tool T1. The friction stir welding tool T1 joins the case 7 and the cover 8 by friction stir so that a refrigerant flow path 91 is formed by the groove 73v and the cover 8.

[0118] The support 153 rotatably supports the spindle 151 about the first axis AX1. The rotation drive device 16 rotates the spindle 151 about the first axis AX1. The rotation drive device 16 may include a motor 16m that rotates the spindle 151 about the first axis AX1.

[0119] In the example shown in FIG. 30, the machine tool 1 includes a machining head 15, and the machining head 15 includes the spindle 151 and the support 153 described above. The machining head 15 may include the motor 16m described above.

[0120] The moving device 17 relatively moves the machining head 15 (more specifically, the spindle 151 and the support 153) with respect to the workpiece support device 3. The moving device 17 may include a machining head moving device 171 that moves the machining head 15. Alternatively, or additionally, the moving device 17 may include a table moving device 178 that moves the table 31 of the workpiece support device 3.

[0121] The supply device 12 supplies the coolant L1 to the applicator 60. The applicator 60 discharges the coolant L1 into the case 7 during the execution of friction stir welding. As illustrated in FIG. 12, the applicator 60 may include at least one nozzle 61 that discharges the coolant L1 onto the inner surface 7n of the case 7. The coolant L1 discharged onto the inner surface 7n of the case 7 does not reach the cover 8. Therefore, the coolant L1 discharged onto the inner surface 7n of the case 7 does not enter the groove portion 73v (or the refrigerant flow path 91) through the gap between the case 7 and the cover 8.

[0122] As illustrated in FIG. 12, the applicator 60 may include a first nozzle 61a that discharges the coolant L1 onto the inner surface 73n of the end wall 73 of the case 7. Alternatively, or additionally, as illustrated in FIG. 24, the applicator 60 may include a second nozzle 61b that discharges the coolant L1 onto the inner surface 73n of the end wall 73 of the case 7 and / or the inner surface 71n of the side wall 71 of the case 7.

[0123] Alternatively, or additionally, the applicator 60 may include at least one outer nozzle 62 that discharges the coolant L1 onto the outer surface 71t of the side wall 71 of the case 7.

[0124] In the first embodiment, the machine tool 1 includes an applicator 60 that discharges the coolant L1 into the case 7. The applicator 60 discharges the coolant L1 into the case 7 when the case 7 and the cover 8 are friction stir welded. In this way, distortion of the case 7 due to the heat generated by friction stir welding is suppressed.

[0125] In the example shown in FIGS. 12 and 24, the applicator 60 discharges the coolant L1 only into the case 7 out of the case 7 and the cover 8. More specifically, during the execution of friction stir welding, the applicator 60 discharges the coolant L1 into the case 7 so that the coolant L1 does not reach the cover 8.

[0126] During the execution of friction stir welding, if the coolant L1 does not reach the cover 8, the coolant L1 does not enter the groove portion 73v (or the refrigerant flow path 91) through the gap between the case 7 and the cover 8. Therefore, the cleaning process of the refrigerant flow path 91 becomes unnecessary or the cleaning process is simplified.

[0127] In the example shown in FIGS. 12 and 24, when the case 7 and the cover 8 are supported by the work support device 3 (more specifically, the jig 4), the applicator 60 is disposed to face the case 7 without facing the cover 8. In this case, the coolant L1 discharged from the applicator 60 is less likely to further enter the groove portion 73v (or the refrigerant flow path 91) through the gap between the case 7 and the cover 8.

[0128] (Optional additional configuration) Subsequently, with reference to FIGS. 1 to 36, an optional additional configuration that can be adopted in the machine tool 1 in the first embodiment will be described.

[0129] (Work support device 3) In the example shown in FIG. 16, the machine tool 1 includes a work support device 3. The work support device 3 includes a jig 4 to which the case 7 is attached. The work support device 3 may include a table 31 to which the jig 4 is attached.

[0130] In the example described in FIG. 16, the machine tool 1 (more specifically, the moving device 17) includes a machining head moving device 171 that moves the machining head 15. In the example described in FIG. 16, the machining head moving device 171 can move the machining head 15 in a direction (Z direction) substantially parallel to the vertical direction. The machining head moving device 171 may move the machining head 15 in a direction substantially parallel to the horizontal plane.

[0131] In the example described in FIG. 16, the machine tool 1 (more specifically, the moving device 17) includes a table moving device 178 that moves the table 31. The table moving device 178 can move the table 31 in a direction substantially parallel to the horizontal plane. In the example described in FIG. 16, the table moving device 178 includes an X-axis moving device 178a that moves the table 31 in a direction along the X-axis substantially parallel to the horizontal plane. The table moving device 178 may include a Y-axis moving device 178b that moves the table 31 in a direction along the Y-axis perpendicular to both the vertical direction and the X-axis.

[0132] In the example described in FIG. 11, the work support device 3 (more specifically, the jig 4) includes a backing member 40 that supports the end wall 73 of the case 7. The backing member 40 receives the pressing force from the friction stir welding tool T1 via the case 7 and the cover 8, and supports the end wall 73 of the case 7.

[0133] The backing member 40 suppresses the distortion of the end wall 73 caused by the pressing of the end wall 73 by the friction stir welding tool T1.

[0134] In the example described in FIG. 11, the backing member 40 has a first support column 42-1 that supports the case 7. The backing member 40 may have a plurality of support columns 42 including the first support column 42-1 and the second support column 42-2. Each of the plurality of support columns 42 receives the pressing force from the friction stir welding tool T1 via the case 7 and the cover 8. In other words, when the case 7 and the cover 8 are friction stir welded by the friction stir welding tool T1, each of the plurality of support columns 42 supports the case 7 against the pressing force received by the case 7 and the cover 8 from the friction stir welding tool T1.

[0135] In the example described in FIG. 11, the first support column 42-1 has a first end 42a-1 that contacts the inner surface 73n of the end wall 73 of the case 7. In the example described in FIG. 11, the second support column 42-2 has a second end 42a-2 that contacts the inner surface 73n of the end wall 73 of the case 7.

[0136] In the example described in FIG. 11, the position of the first end 42a-1 is different from the position of the second end 42a-2 in the direction along the first direction DR1. More specifically, the second end 42a-2 is located on the first direction DR1 side (more specifically, the lower side) of the first end 42a-1.

[0137] In the example described in FIG. 13, a first supply channel 44 for supplying the coolant L1 to the first nozzle 61a is formed inside the backing member 40 (more specifically, inside the first support column 42-1).

[0138] In the example described in FIG. 11, the jig 4 includes a base 64 that supports the backing member 40. In the example described in FIG. 11, the base 64 supports a plurality of support columns 42 including the first support column 42-1 and the second support column 42-2. The base 64 can be attached to the table 31 of the workpiece support device 3. Also, the base 64 can be removed from the table 31.

[0139] In the example described in FIG. 14, the relative position of the first end 42a-1 of the first support column 42-1 with respect to the base 64 can be adjusted in the first direction DR1 (and the second direction DR2). In the example described in FIG. 15, the relative position of the second end 42a-2 of the second support column 42-2 with respect to the base 64 can be adjusted in the first direction DR1 (and the second direction DR2).

[0140] As illustrated in FIG. 14, the first support column 42-1 may be telescopic. More specifically, the first support column 42-1 may include a first portion 421-1 fixed to the base 64 and a second portion 421-2 that is relatively movable in a second direction DR2 (e.g., upward) with respect to the first portion 421-1. In the example described in FIG. 14, the above-described first end 42a-1 is disposed on the second portion 421-2. Further, the above-described first nozzle 61a is disposed on the second portion 421-2.

[0141] When the first support column 42-1 extends, the position of the first end 42a-1 of the first support column 42-1 is adjusted in a direction away from the base 64 (in other words, in the second direction DR2). When the first support column 42-1 contracts, the position of the first end 42a-1 of the first support column 42-1 is adjusted in a direction approaching the base 64 (in other words, in the first direction DR1).

[0142] The first support column 42-1 may include a first spring 64-1 that biases the second portion 421-2 in the second direction DR2 (e.g., upward). Alternatively, or additionally, the first support column 42-1 may include a fluid pressure cylinder (e.g., an air cylinder or a hydraulic cylinder) that moves the second portion 421-2 in the second direction DR2 (e.g., upward).

[0143] In the example described in FIG. 14, when the second portion 421-2 is pressed by the case 7, the first spring 64-1 contracts. Thus, the height of the second portion 421-2 is automatically adjusted in response to the shape of the case 7 or the manufacturing error of the case 7.

[0144] As illustrated in FIG. 11, the first support column 42-1 may include a first fixing member 65-1 that fixes the relative position of the second portion 421-2 with respect to the first portion 421-1. In this case, after the height of the second portion 421-2 is adjusted, the height of the second portion 421-2 can be fixed using the first fixing member 65-1.

[0145] As illustrated in FIG. 15, the second support column 42-2 may be telescopic. More specifically, the second support column 42-2 may include a third portion 421-3 fixed to the base 64 and a fourth portion 421-4 that is relatively movable in a second direction DR2 (e.g., upward) with respect to the third portion 421-3. In the example described in FIG. 15, the above-described second end 42a-2 is disposed on the fourth portion 421-4.

[0146] When the second support column 42-2 extends, the position of the second end 42a-2 of the second support column 42-2 is adjusted in a direction away from the base 64 (in other words, in the second direction DR2). When the second support column 42-2 contracts, the position of the second end 42a-2 of the second support column 42-2 is adjusted in a direction approaching the base 64 (in other words, in the first direction DR1).

[0147] The second support column 42-2 may include a second spring 64-2 that biases the fourth portion 421-4 in the second direction DR2 (e.g., upward). Alternatively, or additionally, the second support column 42-2 may include a fluid pressure cylinder (e.g., an air cylinder or a hydraulic cylinder) that moves the fourth portion 421-4 in the second direction DR2 (e.g., upward).

[0148] As illustrated in FIG. 11, the second support column 42-2 may include a second fixing member 65-2 that fixes the relative position of the fourth portion 421-4 with respect to the third portion 421-3. In this case, after the height of the fourth portion 421-4 is adjusted, the height of the fourth portion 421-4 can be fixed using the second fixing member 65-2.

[0149] In the example described in FIG. 31, the base 64 includes a lower base 641 and an upper base 646. The base 64 also includes a plurality of connecting columns 647 that connect the lower base 641 and the upper base 646. In the example described in FIG. 31, the lower base 641 is disposed on the first direction DR1 side of the upper base 646.

[0150] In the example shown in FIG. 31, the lower base 641 supports the lining member 40. In the example shown in FIG. 31, the holding member 50 is arranged on the upper base 646. As illustrated in FIG. 31, the outer nozzle 62 may be supported on the base 64 (more specifically, the upper base 646).

[0151] In the example shown in FIG. 16, the base 64 (more specifically, the lower base 641) is attached to the table 31. In the example shown in FIG. 16, the machine tool 1 includes a fixing member F that fixes the base 64 (more specifically, the lower base 641) to the table 31. The fixing member F is, for example, a bolt F1.

[0152] In the example shown in FIG. 11, the workpiece support device 3 (more specifically, the jig 4) includes a holding member 50 that holds the side wall 71 of the case 7. In the example shown in FIG. 11, with the side wall 71 of the case 7 held by the holding member 50, the friction stir welding tool T1 that relatively moves with respect to the holding member 50 during friction stir welding does not interfere with the holding member 50.

[0153] The holding member 50 prevents the case 7 from shifting during the execution of friction stir welding. Also, when the side wall 71 of the case 7 is held by the holding member 50, the friction stir welding tool T1 that relatively moves with respect to the holding member 50 during friction stir welding does not interfere with the holding member 50.

[0154] In the example shown in FIG. 11, the holding member 50 includes a first holding member 51a that holds the first side wall 71-1 of the case 7 and a second holding member 51b that holds the second side wall 71-2 of the case 7.

[0155] In the example shown in FIG. 11, the lining member 40 is arranged so as to cross the space SP1 between the first holding member 51a and the second holding member 51b.

[0156] In the example described in FIG. 11, the first holding member 51a has a first movable portion 513a that can be repositioned with respect to a first fixed portion 511a (e.g., a part of the upper base 646). As the first movable portion 513a moves toward the first fixed portion 511a, the first side wall 71-1 of the case 7 is clamped between the first fixed portion 511a and the first movable portion 513a. The first movable portion 513a may be screwed onto a first screw member SB1. In this case, as the first screw member SB1 is rotated relative to the first movable portion 513a, the first movable portion 513a moves toward the first fixed portion 511a. Alternatively, the first holding member 51a may include a fluid pressure cylinder (e.g., an air cylinder or a hydraulic cylinder) that moves the first movable portion 513a toward the first fixed portion 511a.

[0157] In the example described in FIG. 11, the second holding member 51b has a second movable portion 513b that can be repositioned with respect to a second fixed portion 511b (e.g., another part of the upper base 646). As the second movable portion 513b moves toward the second fixed portion 511b, the second side wall 71-2 of the case 7 is clamped between the second fixed portion 511b and the second movable portion 513b. The second movable portion 513b may be screwed onto a second screw member SB2. In this case, as the second screw member SB2 is rotated relative to the second movable portion 513b, the second movable portion 513b moves toward the second fixed portion 511b. Alternatively, the second holding member 51b may include a fluid pressure cylinder (e.g., an air cylinder or a hydraulic cylinder) that moves the second movable portion 513b toward the second fixed portion 511b.

[0158] In the example described in FIG. 23, the holding member 50 (e.g., the first holding member 51a and the second holding member 51b) is supported by a base 64 (more specifically, the upper base 646).

[0159] In the examples described in FIGS. 9 and 10, the work support device 3 (more specifically, the jig 4) includes a detachment prevention member 67 that prevents the cover 8 from detaching from the case 7. In the examples described in FIGS. 9 and 10, the detachment prevention member 67 includes a first detachment prevention member 67-1 and a second detachment prevention member 67-2. The work support device 3 (more specifically, the jig 4) may include a first actuator 68-1 that moves the first detachment prevention member 67-1 between a first extended position P1-1 in contact with the cover 8 and a first retracted position P2-1 away from the cover 8. Further, the work support device 3 (more specifically, the jig 4) may include a second actuator 68-2 that moves the second detachment prevention member 67-2 between a second extended position P1-2 in contact with the cover 8 and a second retracted position P2-2 away from the cover 8.

[0160] In the examples described in FIGS. 9 and 10, the detachment prevention member 67 (for example, the first detachment prevention member 67-1 and the second detachment prevention member 67-2) is supported by the base 64 (more specifically, the upper base 646).

[0161] In the example described in FIG. 12, at least one nozzle 61 is attached to the jig 4 (more specifically, the backing member 40 of the jig 4). In the example described in FIG. 12, the first nozzle 61a is attached to the side surface 43 of the backing member 40 (more specifically, the side surface 43 of the first support column 42-1).

[0162] In the example described in FIG. 12, at least one nozzle 61 (for example, the first nozzle 61a) is a spray nozzle SN that diffuses the coolant L1 toward the inner surface 7n of the case 7. As illustrated in FIG. 32, the spray nozzle SN (for example, the first nozzle 61a) may be configured to diffuse the coolant L1 in a fan shape. Alternatively, the spray nozzle SN (for example, the first nozzle 61a) may be configured to diffuse the coolant L1 in a conical shape.

[0163] In the example described in FIG. 12, at least one outer nozzle 62 is attached to the jig 4 (more specifically, the base 64 of the jig 4).

[0164] Each of the plurality of outer nozzles 62 may discharge the coolant L1 in a fan shape toward the outer surface 71t of the side wall 71 so that the side wall 71 is cooled over a wide range.

[0165] From the viewpoint of preventing the coolant L1 from reaching the cover 8, each of the plurality of outer nozzles 62 may discharge the coolant L1 obliquely downward. From the viewpoint of preventing the coolant L1 from reaching the cover 8, the discharge rate of the coolant L1 from each of the plurality of outer nozzles 62 may be slower than the discharge rate of the coolant L1 from the first nozzle 61a. When the discharge rate of the coolant L1 from the outer nozzle 62 is slow, the coolant L1 discharged from the outer nozzle 62 is less likely to diffuse upward.

[0166] The machine tool 1 may be selectively executable in a first discharge mode (see FIG. 24) in which the coolant L1 is discharged from the first nozzle 61a with the discharge of the coolant L1 from the outer nozzle 62 stopped, and a second discharge mode (see FIG. 12) in which the coolant L1 is discharged from both the first nozzle 61a and the outer nozzle 62.

[0167] (Wall 11a and door 11b) As illustrated in FIGS. 33 and 34, the machine tool 1 may include a wall 11a surrounding a processing region RG1 where friction stir welding is performed. The wall 11a prevents the coolant L1 from scattering outside the processing region RG1 where friction stir welding is performed.

[0168] The wall 11a surrounds the case 7 and the cover 8 supported by the work support device 3. In the example shown in FIGS. 33 and 34, the wall 11a surrounds the jig 4 that supports the case 7 and the cover 8. Further, the wall 11a surrounds the lower end portion 15g of the processing head 15. In the example shown in FIGS. 33 and 34, the wall 11a surrounds the table 31.

[0169] As illustrated in FIGS. 33 and 34, the wall 11a may be formed with an opening OP through which the case 7 and the cover 8 can pass. In the example described in FIGS. 33 and 34, the machine tool 1 includes a door 11b that opens and closes the opening OP formed in the wall 11a. The wall 11a and the door 11b surround the processing area RG1 where friction stir welding is performed, and prevent the coolant L1 from scattering outside the processing area RG1.

[0170] (Feeding device 12) In the example described in FIG. 30, the feeding device 12 includes a pump 121 that supplies the coolant L1 to the applicator 60 (for example, at least one nozzle 61). The feeding device 12 may include a valve 123 disposed between the applicator 60 (for example, at least one nozzle 61) and the pump 121.

[0171] (Circulation of coolant L1) As illustrated in FIG. 30, the machine tool 1 may include a circulation channel 13 for circulating the coolant L1 and a tank 141 for storing the coolant L1.

[0172] The circulation channel 13 includes a supply channel 131 that supplies the coolant L1 from the tank 141 to the applicator 60 (for example, at least one nozzle 61).

[0173] The circulation channel 13 includes a return channel 138 that returns the coolant L1 in the processing area RG1 where the above-described friction stir welding is performed to the tank 141. When the processing area RG1 is surrounded by the wall 11a, the recovery of the coolant L1 can be performed smoothly.

[0174] (Chiller 143) The machine tool 1 may include a chiller 143 that lowers the temperature of the coolant L1. In the example described in FIG. 30, the chiller 143 receives the coolant L1 from the tank 141 and lowers the temperature of the received coolant L1. The coolant L1 whose temperature has been lowered is returned to the tank 141.

[0175] (Cutting tool T2) As illustrated in FIG. 25, the machine tool 1 may be capable of cutting at least one of the case 7 and the cover 8 using the cutting tool T2. More specifically, the spindle 151 may be capable of holding the cutting tool T2.

[0176] For example, when burrs are generated from at least one of the case 7 and the cover 8 by the friction stir welding tool T1, the burrs may be removed using the cutting tool T2 (e.g., the milling tool T2-1).

[0177] The cutting tool T2 attached to the spindle 151 may be a drilling tool T2-2. After the case 7 and the cover 8 are friction stir welded, holes may be formed in the case 7 and / or the cover 8 using the cutting tool T2 (e.g., the drilling tool T2-2). For example, the hole 75h (see FIG. 2) of the attachment portion 75 may be formed using the drilling tool T2-2.

[0178] The cutting tool T2 attached to the spindle 151 may be a tap tool. After the case 7 and the cover 8 are friction stir welded, threads may be formed in a hole (e.g., a hole formed in the case 7) using the cutting tool T2 (e.g., the tap tool).

[0179] After the case 7 and the cover 8 are friction stir welded, the side wall 71 of the case 7 or the inner surface of the case 7 may be cut using the cutting tool T2.

[0180] In the machine tool 1 according to the first embodiment, friction stirring can be performed while the coolant L1 is applied to the case 7. Therefore, distortion of the case 7 due to the heat generated by friction stirring is suppressed. For this reason, the machine tool 1 can cut at least one of the case 7 and the cover 8 with high precision following the friction stir welding of the case 7 and the cover 8.

[0181] (Tool changer 19) As illustrated in FIG. 35, the machine tool 1 may be provided with a tool changer 19. The tool changer 19 can replace the friction stir welding tool T1 held by the spindle 151 with a cutting tool T2 (for example, a milling tool T2-1, a drilling tool T2-2, a tapping tool, etc.).

[0182] In the example shown in FIG. 35, the tool changer 19 includes a tool changing arm 191, an arm rotating device 194 that rotates the tool changing arm 191, and an arm moving device 196 that linearly moves the tool changing arm 191. The arm rotating device 194 rotates the tool changing arm 191 around the second axis AX2. Also, the arm moving device 196 moves the tool changing arm 191 in a direction parallel to the second axis AX2.

[0183] In the example shown in FIG. 35, the tool changing arm 191 can hold the friction stir welding tool T1 and the cutting tool T2 simultaneously. In the example shown in FIG. 35, the tool changing arm 191 has a first gripping portion 191a that grips the friction stir welding tool T1 and a second gripping portion 191b that grips the cutting tool T2.

[0184] Alternatively, the tool change may be performed manually. Also, when the machine tool 1 is a machine that can only perform friction stirring, the tool change is omitted.

[0185] (Control device 2) As illustrated in FIG. 30, the machine tool 1 may be provided with a control device 2 that controls the rotational drive device 16 and the moving device 17. Additionally, the control device 2 may control the supply device 12. Alternatively, or additionally, the control device 2 may control the tool changer 19. Alternatively, or additionally, the control device 2 may control the actuator 68 (more specifically, the first actuator 68-1 and the second actuator 68-2) that moves the anti-disengagement member 67.

[0186] In the example described in FIG. 36, the control device 2 includes a hardware processor 20 (hereinafter simply referred to as "processor 20"), a memory 22, a communication circuit 24, an input device 26, and a display 27. The processor 20, the memory 22, the communication circuit 24, the input device 26, and the display 27 are connected to each other via a bus 28. In the example described in FIG. 36, the input device 26 includes a touch panel 26t on the display 27. In other words, the display 27 is a display with a touch panel 26t. The input device 26 may include buttons, switches, levers, pointing devices, and / or a keyboard.

[0187] The memory 22 is a storage medium readable by the processor 20 of the control device 2. The memory 22 may be, for example, a non-volatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, etc., a magnetic disk, or other forms of memory.

[0188] The memory 22 stores data DA and a processing program PM. By executing the processing program PM stored in the memory 22 by the processor 20 of the control device 2, the control device 2 generates a control command. Further, the communication circuit 24 transmits the control command to the controlled device (more specifically, the rotation drive device 16, the moving device 17, the supply device 12, the tool changer 19, the actuator 68, etc.). Thus, by the processor 20 executing the processing program PM, the control device 2 can control the controlled device (more specifically, the rotation drive device 16, the moving device 17, the supply device 12, the tool changer 19, the actuator 68, etc.).

[0189] (Bonding mode M1) As illustrated in FIG. 22, the control device 2 is capable of executing the bonding mode M1. The bonding mode M1 is a mode in which the case 7 and the cover 8 are friction stir welded so that the refrigerant flow path 91 is formed by the groove portion 73v of the case 7 and the cover 8.

[0190] Also, the joining mode M1 is a mode in which the case 7 and the cover 8 are friction stir joined using the friction stir joining tool T1. More specifically, the joining mode M1 is a mode in which the rotating friction stir joining tool T1 is relatively moved with respect to the case 7 and the cover 8 so that the case 7 and the cover 8 are friction stir joined.

[0191] As illustrated in FIG. 30, when the joining mode M1 is executed, the control device 2 transmits a first rotation command R1 to the rotation drive device 16. The rotation drive device 16 that receives the first rotation command R1 rotates the spindle 151 that holds the friction stir joining tool T1 around the first axis AX1.

[0192] When the joining mode M1 is executed, the control device 2 transmits a first movement command S1 to the movement device 17. The movement device 17 that receives the first movement command S1 relatively moves the rotating friction stir joining tool T1 along a first path PA (see FIG. 21) specified by the machining program PM with respect to the case 7 and the cover 8.

[0193] The first path PA may include a boundary PA1 between the case 7 and the cover 8. In this case, the case 7 and the cover 8 are butted and joined by friction stir. More specifically, the first path PA may include a boundary PA1-1 between the stepped portion 731 (see FIG. 5) of the case 7 and the outer edge portion 81 (see FIG. 5) of the cover 8. In this case, the stepped portion 731 of the case 7 and the outer edge portion 81 of the cover 8 are butted and joined by friction stir.

[0194] As can be understood from FIGS. 1 and 21, the first path PA may include a path PA2 along the region where the case 7 and the cover 8 are overlapped. In this case, the case 7 and the cover 8 are overlapped and joined by friction stir. In the example shown in FIG. 21, the first path PA includes a path PA2-1 passing through the central portion 83 of the cover 8. In this case, the case 7 and the central portion 83 of the cover 8 are overlapped and joined by friction stir.

[0195] In the example described in FIG. 22, at least one of the plurality of support columns 42 is located vertically below the central portion 83 of the cover 8. More specifically, when the case 7 and the central portion 83 of the cover 8 are superposed and joined, at least one of the plurality of support columns 42 supports the end wall 73 of the case 7 vertically below the friction stir welding tool T1.

[0196] In the example described in FIG. 21, the first path PA includes both the boundary PA1 between the case 7 and the cover 8 and the path PA2-1 passing through the central portion 83 of the cover 8. In this case, the case 7 and the cover 8 are butted and joined by friction stir, and the central portion 83 of the case 7 and the cover 8 are superposed and joined by friction stir.

[0197] When the joining mode M1 is executed, the applicator 60 (for example, the first nozzle 61a and / or the second nozzle 61b) discharges the coolant L1 onto the case 7 (for example, the inner surface 7n of the case 7). More specifically, at least one nozzle 61 (for example, the first nozzle 61a and / or the second nozzle 61b) injects the coolant L1 onto the inner surface 73n of the end wall 73 of the case 7.

[0198] As illustrated in FIG. 24, when the joining mode M1 is executed, at least one nozzle 61 may discharge the coolant L1 onto substantially the entire inner surface 73n of the end wall 73 excluding the portion of the inner surface 73n of the end wall 73 that contacts the backing member 40. As illustrated in FIG. 12, when the joining mode M1 is executed, at least one outer nozzle 62 may discharge the coolant L1 onto the outer surface 71t of the side wall 71 of the case 7.

[0199] As illustrated in FIG. 30, when the joining mode M1 is executed, the control device 2 may transmit a supply command U1 to the supply device 12. The supply device 12 (for example, the pump 121 and / or the valve 123) that receives the supply command U1 supplies the coolant L1 to the applicator 60 (for example, the first nozzle 61a and / or the second nozzle 61b). The applicator 60 (for example, the first nozzle 61a and / or the second nozzle 61b) discharges the coolant L1 supplied from the supply device 12 to the case 7.

[0200] Alternatively, the supply device 12 (for example, the pump 121 and / or the valve 123) may be manually operated by the operator. More specifically, the machine tool 1 may be provided with a manual switch for operating the supply device 12.

[0201] In the example described in FIG. 30, when the joining mode M1 is executed, the applicator 60 (for example, the first nozzle 61a and / or the second nozzle 61b) discharges the coolant L1 only to the case 7 among the case 7 and the cover 8. When the coolant L1 does not reach the cover 8, the coolant L1 does not enter the gap between the case 7 and the cover 8.

[0202] As illustrated in FIG. 17, the execution of the joining mode M1 may be started in a state where the detachment prevention member 67 is located at the advanced position P1 in contact with the cover 8. More specifically, in a state where the detachment prevention member 67 is located at the advanced position P1 in contact with the cover 8, the friction stir welding of the case 7 and the cover 8 by the friction stir welding tool T1 may be started. In this case, when the friction stir welding is started, the cover 8 is prevented from detaching from the case 7.

[0203] As illustrated in FIGS. 17 and 18, the control device 2 may transmit a first operation command to the actuator 68 so that the anti-disengagement member 67 moves from the above-described advanced position P1 to the above-described retracted position P2 in response to the friction stir welding tool T1 approaching the anti-disengagement member 67. The control device 2 may determine whether or not the friction stir welding tool T1 is approaching the anti-disengagement member 67 based on the machining program PM. Alternatively, the control device 2 may determine whether or not the friction stir welding tool T1 is approaching the anti-disengagement member 67 based on a signal from a proximity sensor.

[0204] As illustrated in FIGS. 17 and 18, the control device 2 may control the first actuator 68-1 and the second actuator 68-2 so that, in response to the friction stir welding tool T1 approaching the first anti-disengagement member 67-1, the first anti-disengagement member 67-1 is located at the first retracted position P2-1 and the second anti-disengagement member 67-2 is located at the second advanced position P1-2.

[0205] As illustrated in FIGS. 19 and 20, the control device 2 may control the first actuator 68-1 and the second actuator 68-2 so that, in response to the friction stir welding tool T1 approaching the second anti-disengagement member 67-2, the first anti-disengagement member 67-1 is located at the first advanced position P1-1 and the second anti-disengagement member 67-2 is located at the second retracted position P2-2.

[0206] In the example described in FIG. 13, the joining mode M1 is executed in a state where the friction stir welding tool T1 is located above the backing member 40. When the machine tool 1 is a horizontal machining center, the joining mode M1 may be executed in a state where the height of the friction stir welding tool T1 is substantially the same as the height of the backing member 40.

[0207] (Cutting mode M2) As illustrated in FIGS. 25 and 30, the control device 2 may be capable of selectively executing a joining mode M1 and a cutting mode M2. The cutting mode M2 is a mode in which at least one of the case 7 and the cover 8 is cut using the cutting tool T2. More specifically, the cutting mode M2 is a mode in which the rotating cutting tool T2 is relatively moved with respect to the case 7 and the cover 8 so that at least one of the case 7 and the cover 8 is cut.

[0208] In the example described in FIGS. 25 and 30, the spindle 151 can selectively hold the friction stir joining tool T1 and the cutting tool T2. When the joining mode M1 is executed, the spindle 151 holds the friction stir joining tool T1, and when the cutting mode M2 is executed, the spindle 151 holds the cutting tool T2.

[0209] As illustrated in FIG. 25, when the cutting mode M2 is executed, the control device 2 transmits a second rotation command R2 to the rotation drive device 16. The rotation drive device 16 that receives the second rotation command R2 rotates the spindle 151 that holds the cutting tool T2 about the first axis AX1.

[0210] When the cutting mode M2 is executed, the control device 2 transmits a second movement command S2 to the movement device 17. The movement device 17 that receives the second movement command S2 relatively moves the rotating cutting tool T2 along a second path PB specified by the machining program PM with respect to the case 7 and the cover 8.

[0211] The second path PB may overlap with the first path PA described above. For example, the control device 2 may control the movement device 17 so that the rotating cutting tool T2 (for example, the milling tool T2-1) relatively moves with respect to the case 7 and the cover 8 along a second path PB that overlaps with the first path PA described above. In this case, the burr generated during friction stirring is removed by the cutting tool T2 (for example, the milling tool T2-1).

[0212] The second path PB may include a path parallel to the first direction DR1. For example, by moving the rotating cutting tool T2 (e.g., the drilling tool T2-2) along the second path PB, a hole may be formed in the case 7 and / or the cover 8 by the cutting tool T2 (e.g., the drilling tool T2-2). Alternatively, or additionally, by moving the rotating cutting tool T2 (e.g., the tapping tool) along the second path PB, a thread may be formed in the above-mentioned hole (e.g., the hole formed in the case 7) by the cutting tool T2 (e.g., the tapping tool).

[0213] During the execution of the cutting mode M2, cutting fluid may be applied to the cutting tool T2. Alternatively, the cutting mode M2 may be executed without applying cutting fluid to the cutting tool T2 (dry cutting).

[0214] As illustrated in FIG. 26, the cutting mode M2 may be executed in a state where the above-mentioned detachment prevention member 67 is located at the retracted position P2 away from the cover 8. More specifically, at least one of the case 7 and the cover 8 may be cut by the cutting tool T2 in a state where the above-mentioned detachment prevention member 67 is located at the retracted position P2 away from the cover 8.

[0215] When the machine tool 1 does not have the function of cutting a workpiece using a cutting tool, or when it is not necessary to cut the case 7 and the cover 8, etc., the above-mentioned cutting mode M2 is omitted.

[0216] (Tool change mode M3) In the example described in FIG. 35, the control device 2 is capable of executing the tool change mode M3. The tool change mode M3 is a mode in which the friction stir welding tool T1 held by the spindle 151 is exchanged for the cutting tool T2.

[0217] More specifically, after the execution of the above-described joining mode M1, the control device 2 transmits a tool change command C1 to the tool changer 19 so that the friction stir welding tool T1 held by the spindle 151 is replaced with the cutting tool T2. The tool changer 19 that receives the tool change command C1 replaces the friction stir welding tool T1 held by the spindle 151 with the cutting tool T2. After the execution of the tool change mode M3, the above-described cutting mode M2 is executed.

[0218] Alternatively, the tool change may be performed manually. More specifically, the operator may manually perform the operation of removing the friction stir welding tool T1 from the spindle 151 and the operation of attaching the cutting tool T2 to the spindle 151. In this case, the above-described tool change mode M3 is omitted.

[0219] The present invention is not limited to the above-described embodiments or each modification, and it is obvious that each embodiment or each modification can be appropriately deformed or changed within the scope of the technical idea of the present invention. Also, various techniques used in each embodiment or each modification are applicable to other embodiments or other modifications as long as no technical contradiction occurs. Furthermore, any additional configuration in each embodiment or each modification can be appropriately omitted.

Explanation of Reference Numerals

[0220] 1... Machine tool, 2... Control device, 3... Work support device, 4... Fixture, 7... Case, 7n... Inner surface of the case, 8... Cover, 11a... Wall, 11b... Door, 12... Feeding device, 13... Circulation flow path, 15... Machining head, 15g... Lower end of the machining head, 16... Rotary drive device, 16m... Motor, 17... Moving device, 19... Tool changer, 20... Processor, 22... Memory, 24... Communication circuit, 26... Input device, 26t... Touch panel, 27... Display, 28... Bus, 31... Table, 40... Lining member, 42... Support column, 42-1... First support column, 42-2... Second support column, 42a-1... First end, 42a-2... Second end, 43... Side surface, 44... First supply flow path, 50... Holding member, 51a... First holding member, 51b... Second holding member, 60... Applicator, 61... Nozzle, 61a... First nozzle, 61b... Second nozzle, 62... Outer nozzle, 64... Base, 64-1... First spring, 64-2... Second spring, 65-1... First fixing member, 65-2... Second fixing member, 67... Disengagement prevention member, 67-1... First disengagement prevention member, 67-2... Second disengagement prevention member, 68... Actuator, 68-1... First actuator, 68-2... Second actuator, 71... Side wall, 71-1... First side wall, 71-2... Second side wall, 71-3... Third side wall, 71-4... Fourth side wall, 71n... Inner surface of the side wall, 71t... Outer surface of the side wall, 72... Flange portion, 72-1... First flange portion, 72-2... Second flange portion, 73... End wall, 73n... Inner surface of the end wall, 73p... Ridge, 73t... Outer surface of the end wall, 73v... Groove portion, 74... Recess, 75... Mounting portion, 75h... Hole portion, 79a... First port, 79b... Second port, 81... Outer edge portion of the cover, 83... Central portion of the cover, 89a... First port, 89b... Second port, 91... Refrigerant flow path, 121... Pump, 123... Valve, 131... Supply flow path, 138... Return flow path, 141... Tank, 143... Chiller, 151... Spindle, 153... Support, 171... Machining head moving device, 178... Table moving device, 178a... X-axis moving device, 178b... Y-axis moving device, 191... Tool change arm, 191a... First gripping portion, 191b... Second gripping portion, 194... Arm rotating device, 196... Arm moving device, 421-1... First part, 421-2... Second part, 421-3... Third part, 421-4... Fourth part, 511a... First fixing portion, 511b... Second fixing portion, 513a... First movable portion, 513b... Second movable portion, 641... Lower base, 646... Upper base,647... Connecting pillar, 730... Bottom wall, 731... Step portion, 738... Depression, AX1... First axis, AX2... Second axis, C1... Tool change command, CB... Cover, DA... Data, DR1... First direction, DR2... Second direction, EB... Structure, F... Fixed member, F1... Bolt, JR... Joint region, L1... Cooling liquid, M1... Joining mode, M2... Cutting mode, M3... Tool change mode, OB... Object to be cooled, OP... Opening, P1... Forward / backward position, P1-1... First forward / backward position, P1-2... Second forward / backward position, P2... Retracted position, P2-1... First retracted position, P2-2... Second retracted position, PA... First path, PA1... Boundary between the case and the cover, PA1-1... Boundary between the step portion of the case and the outer edge portion of the cover, PA2... Path along the region where the case and the cover are overlapped, PA2-1... Path passing through the central portion of the cover, PB... Second path, PM... Machining program, R1... First rotation command, R2... Second rotation command, RG1... Machining region, S1... First movement command, S2... Second movement command, SB1... First screw member, SB2... Second screw member, SN... Spray nozzle, SP... Internal space, SP1... Space between the first holding member and the second holding member, T1... Friction stir welding tool, T2... Cutting tool, T2-1... Milling tool, T2-2... Drilling tool, U1... Supply command,

Claims

1. A step of preparing a case having a recess defined by side walls and end walls, and a groove formed on an outer surface of the end wall, and a cover covering the groove; A step of joining the case and the cover by friction stir welding such that a refrigerant flow path is formed by the groove and the cover; A step of discharging a coolant from an applicator to only the case among the case and the cover during execution of the friction stir welding; Comprising A method for forming a refrigerant flow path.

2. The coolant is prevented from reaching the cover by the case. The method for forming a refrigerant flow path according to Claim 1.

3. The coolant is applied to an inner surface of the case during execution of the friction stir welding. The method for forming a refrigerant flow path according to Claim 1 or 2.

4. The coolant is applied to an outer surface of the side wall during execution of the friction stir welding. The method for forming a refrigerant flow path according to Claim 1 or 2.

5. The joining step includes: Butting and joining the case and the cover by the friction stir welding; Overlapping and joining a central portion of the case and the cover by the friction stir welding Including The method for forming a refrigerant flow path according to Claim 1 or 2.

6. The end wall is supported by a backing member during execution of the friction stir welding, During execution of the friction stir welding, at least one nozzle included in the applicator discharges the coolant to substantially the entire inner surface of the end wall excluding a portion of the inner surface of the end wall that contacts the backing member. The method for forming a refrigerant flow path according to Claim 1 or 2.

7. Further comprising a step of cutting a part of a joining region between the end wall and the cover. The method for forming a refrigerant flow path according to Claim 1 or 2.

8. A step of preparing a case having a recess defined by side walls and end walls, and a groove formed on an outer surface of the end wall, and a cover covering the groove; A step of joining the case and the cover by friction stir welding such that a refrigerant flow path is formed by the groove and the cover; A step of discharging a coolant from an applicator to only the case among the case and the cover during execution of the friction stir welding; A step of disposing a cooling object in the recess; A step of fixing the cover to the case such that the recess is closed by the cover Comprising A method for manufacturing a structure having a refrigerant flow path.

9. A work support device that supports a case having a recess defined by side walls and end walls, and a groove formed on the outer surface of the end wall, and a cover that covers the groove, A spindle capable of holding a friction stir welding tool for joining the case and the cover by friction stir so that a refrigerant flow path is formed by the groove and the cover, A support that rotatably supports the spindle about a first axis, A rotation drive device that rotates the spindle about the first axis, A moving device that relatively moves the spindle and the support with respect to the work support device, A supply device that supplies coolant to an applicator, The applicator that is disposed to face the case without facing the cover when the case and the cover are supported by the work support device, and discharges the coolant to the case during the execution of the friction stir, Comprising Machine tool.

10. The applicator includes at least one nozzle that discharges the coolant to the inner surface of the case The machine tool according to claim 9.

11. The work support device, A backing member that supports the end wall of the case, A holding member that holds the side wall of the case Comprising The machine tool according to claim 9 or 10.

12. Further comprising a wall surrounding a processing area where the friction stir is performed The machine tool according to claim 9 or 10.

13. Comprising a control device that controls the rotation drive device and the moving device, The spindle is capable of holding a cutting tool that cuts at least one of the case and the cover, The control device, A joining mode in which the case and the cover are joined by friction stir so that the refrigerant flow path is formed by the groove and the cover, A cutting mode in which at least one of the case and the cover is cut using the cutting tool Can be selectively executed The machine tool according to claim 9 or 10.

Images