1 FORM 2 THE PATENTS ACT, 1970 (39 of 1970) & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See section 10, Rule 13] SCROLL MACHINING DEVICE AND MACHINING METHOD; MITSUBISHI ELECTRIC CORPORATION, A CORPORATION ORGANISED AND EXISTING UNDER THE LAWS OF JAPAN, WHOSE ADDRESS IS 7-3, MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 1008310, JAPAN THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED 2 DESCRIPTION Technical Field [0001] The present disclosure relates to a scroll machining device machining scrolls 5 of a scroll compressor used for refrigeration, air conditioning, and other purpose, and to a machining method. Background Art [0002] In a scroll compressor, a fixed scroll and an orbiting scroll are combined to 10 define a compression chamber in which fluid is compressed. In the scroll compressor, to prevent the fluid from leaking from the compression chamber, it is necessary to machine the fixed scroll and the orbiting scroll with high accuracy. [0003] As a device machining scroll parts, a machining device including a table to 15 which a workpiece is fixed, and tool stands arranged around the table at intervals in a circumferential direction has been used (for example, see Patent Literature 1). In Patent Literature 1, the table is rotated to sequentially move a surface to be machined of the workpiece fixed onto the table to a position facing each of the tool stands, and the workpiece is machined by a machining tool held by each of the tool stands. The 20 workpiece is a scroll base material in which a scroll lap is erected on a base plate, and rough machining and finish machining are performed on the scroll base material on each of the tool stands. Citation List Patent Literature 25 [0004] Patent Literature 1: Japanese Unexamined Patent Application Publication No. H10-328957 Summary of Invention Technical Problem 30 [0005] 3 The fixed scroll and the orbiting scroll used for the scroll compressor are different in outer shape from each other, and scroll base materials used for production of the fixed scroll and the orbiting scroll are thus different in outer shape from each other. For the machining device described in Patent Literature 1, however, scroll 5 base materials different in outer shape from each other are not discussed as materials to be machined. Therefore, when, as operation of fixing a scroll material onto a table, the orbiting scroll base material is to be fixed onto the table in a case where the fixing portion is formed along the outer shape of the fixed scroll base material, it is necessary to attach to the orbiting scroll base material a jig for adjusting 10 a difference in outer shape from the fixed scroll base material so that the orbiting scroll base material, to which the jig is attached, is fixed onto the table. In the case where the jig is additionally necessary as described above, attaching error of the jig or other errors easily occurs, which may deteriorate machining accuracy. [0006] 15 The present disclosure is made to solve the above-described problems, and an object of the present disclosure is to provide a scroll machining device and a machining method that each machine scroll base materials different in outer shape from each other, with high accuracy. Solution to Problem 20 [0007] A scroll machining device according to an embodiment of the present disclosure is a scroll machining device configured to machine a scroll base material by a machining tool by relatively moving the machining tool and the scroll base material fixed onto a table. The scroll machining device includes a composite clamp 25 chuck including a fixing portion provided corresponding to a first scroll base material and a fixing portion provided corresponding to a second scroll base material, and configured to selectively fix the first scroll base material and the second scroll base material onto the table by using the fixing portions. The first scroll base material and the second scroll base material are each used as the scroll base material and are 30 different in outer shape from each other. 4 Advantageous Effects of Invention [0008] According to an embodiment of the present disclosure, the composite clamp chuck that selectively fixes the first scroll base material and the second scroll base 5 material different in outer shape from each other, onto the table by the respective corresponding fixing portions is provided. Even when the first scroll base material and the second scroll base material are different in outer shape from each other, it is thus possible to selectively fix the scroll base materials onto the table without additionally using a jig, and to improve machining accuracy. 10 Brief Description of Drawings [0009] [Fig. 1] Fig. 1 is a schematic front view of a machining device according to Embodiment 1 of the present disclosure. [Fig. 2] Fig. 2 is a schematic side view of the machining device according to 15 Embodiment 1 of the present disclosure. [Fig. 3] Fig. 3 is a cross-sectional view of a fixed scroll base material to be machined by the machining device according to Embodiment 1 of the present disclosure. [Fig. 4] Fig. 4 is a cross-sectional view of an orbiting scroll base material to be 20 machined by the machining device according to Embodiment 1 of the present disclosure. [Fig. 5] Fig. 5 is a diagram illustrating a state where a fixed scroll produced from the fixed scroll base material illustrated in Fig. 1 and an orbiting scroll produced from the orbiting scroll base material illustrated in Fig. 2 are combined. 25 [Fig. 6] Fig. 6 is a schematic cross-sectional view of a composite clamp chuck according to Embodiment 1 of the present disclosure. [Fig. 7] Fig. 7 is a schematic top view of the composite clamp chuck according to Embodiment 1 of the present disclosure. [Fig. 8] Fig. 8 is a schematic cross-sectional view illustrating a state where the 30 fixed scroll base material is fixed to the composite clamp chuck according to 5 Embodiment 1 of the present disclosure. [Fig. 9] Fig. 9 is a schematic plan view illustrating the state where the fixed scroll base material is fixed to the composite clamp chuck according to Embodiment 1 of the present disclosure. 5 [Fig. 10] Fig. 10 is a schematic cross-sectional view illustrating a state where the orbiting scroll base material is fixed to the composite clamp chuck according to Embodiment 1 of the present disclosure. [Fig. 11] Fig. 11 is a schematic plan view illustrating the state where the orbiting scroll base material is fixed to the composite clamp chuck according to Embodiment 1 10 of the present disclosure. [Fig. 12] Fig. 12 is an explanatory diagram of a state where the orbiting scroll base material is deformed. [Fig. 13] Fig. 13 is a flowchart of a machining method by the machining device according to Embodiment 1 of the present disclosure. 15 Description of Embodiments [0010] A scroll machining device (hereinafter, abbreviated as machining device) according to an embodiment of the present disclosure is described below with reference to drawings. In the following drawings, the same or equivalent 20 components are denoted by the same reference signs, which are common through the entire description of the embodiment described below. Forms of the components described in the entire description of the specification are merely illustrative, and the forms of the components are not limited to the forms described in the specification. [0011] 25 (Embodiment 1) Fig. 1 is a schematic front view of a machining device according to Embodiment 1 of the present disclosure. Fig. 2 is a schematic side view of the machining device according to Embodiment 1 of the present disclosure. A machining device 10 according to Embodiment 1 machines a first scroll base 30 material and a second scroll base material that are workpieces different in outer 6 shape from each other as machining targets. In Embodiment 1, the first scroll base material is a fixed scroll base material that is a raw material for producing a fixed scroll of a scroll compressor, as a first scroll. The second scroll base material is an orbiting scroll base material that is a raw material for producing an orbiting scroll of 5 the scroll compressor, as a second scroll. A configuration of the machining device 10 is described below. [0012] Fig. 3 is a cross-sectional view of the fixed scroll base material to be machined by the machining device according to Embodiment 1 of the present disclosure. Fig. 10 4 is a cross-sectional view of the orbiting scroll base material to be machined by the machining device according to Embodiment 1 of the present disclosure. [0013] As illustrated in Fig. 3, a fixed scroll base material 1 includes a base plate 1a and a scroll lap 1b erected from one of surfaces of the base plate 1a. The base 15 plate 1a includes a circular disc portion 1aa, and a wall portion 1ab erected from an outer periphery of the disc portion 1aa. The fixed scroll base material 1 illustrated in Fig. 1 has a configuration in which the base plate 1a includes the disc portion 1aa and the wall portion 1ab; however, the fixed scroll base material 1 may include no wall portion 1ab. In any case, the base plate 1a has an outer shape including a circular 20 outer periphery. Important portions to be machined in machining of the fixed scroll base material 1 include a bottom land portion 50 that is one of the surfaces of the base plate 1a, a tooth side surface portion 51 that is a side surface of the scroll lap 1b, and a tooth crest portion 52 that is a distal end surface of the scroll lap 1b and is parallel to the bottom land portion 50. 25 [0014] As illustrated in Fig. 4, an orbiting scroll base material 2 includes a base plate 2a, a scroll lap 2b erected from one of surfaces of the base plate 2a, and a cylindrical boss portion 2c provided on the other surface of the base plate 2a. Important portions to be machined in machining of the orbiting scroll base material 2 include a 30 bottom land portion 60 that is one of surfaces of the base plate 2a, a tooth side 7 surface portion 61 that is a side surface of the scroll lap 2b, and a tooth crest portion 62 that is a distal end surface of the scroll lap 2b and is parallel to the bottom land portion 60. [0015] 5 The machining device 10 of Embodiment 1 performs cutting for a machining allowance and cutting (or grinding) as finishing, on the fixed scroll base material 1 and the orbiting scroll base material 2. Subsequently, the fixed scroll and the orbiting scroll produced through the machining are combined in a step of manufacturing a scroll compressor as illustrated in Fig. 5. 10 [0016] Fig. 5 is a diagram illustrating a state where the fixed scroll produced from the fixed scroll base material illustrated in Fig. 1 and the orbiting scroll produced from the orbiting scroll base material illustrated in Fig. 2 are combined. A fixed scroll 100 and an orbiting scroll 200 are combined to cause the scroll 15 lap 1b and the scroll lap 2b to engage with each other. When the fixed scroll 100 and the orbiting scroll 200 are combined, a compression chamber 3 is defined. [0017] In Fig. 5, an axial gap 4 that is a gap between the scroll lap of one of the fixed scroll 100 and the orbiting scroll 200 and the base plate of the other scroll is 20 minimized possible by adjusting a lap height L1 of the fixed scroll 100 and a lap height L2 of the orbiting scroll 200 with high accuracy. The axial gap 4 is a possible leakage flow path through which compressed fluid leaks from an inside to an outside of the compression chamber 3. Therefore, it is desirable to reduce the axial gap 4 as much as possible. 25 [0018] The fixed scroll base material 1 and the orbiting scroll base material 2 carried in the machining device 10 of Embodiment 1 are different in outer shape from each other as illustrated in Fig. 3 and Fig. 4. More specifically, the outer shapes are different in that, for example, an outer diameter of the base plate 1a of the fixed scroll 30 base material 1 is greater than an outer diameter of the base plate 2a of the orbiting 8 scroll base material 2, and a thickness of the base plate 1a of the fixed scroll base material 1 is greater than a thickness of the base plate 2a of the orbiting scroll base material 2. The machining device 10 of Embodiment 1 is characterized by including a composite clamp chuck that is configured to selectively fix the fixed scroll base 5 material 1 and the orbiting scroll base material 2 different in outer shape from each other as described above, onto a table without using a jig adjusting a difference between the outer shapes. [0019] The machining device 10 is described below with reference to Fig. 1 and Fig. 2. 10 The machining device 10 is a numerically control (NC) machine configured to automatically change tools, and specific examples of the machining device 10 include a machining center and a composite lathe. [0020] As illustrated in Fig. 1, the machining device 10 includes, as a configuration of 15 a machining device main body, a bed 11, a moving stand 12 disposed in front of the bed 11, a table 13 that is fixed onto the moving stand 12 and to which a workpiece is to be fixed, and a composite clamp chuck 14 fixed onto the table 13. The machining device 10 further includes a ram 15 disposed on an upper surface of the bed 11, a main shaft portion 16 disposed on a front surface of the ram 15, and a tool holding 20 portion 17 that is provided at a lower end part of the main shaft portion 16 and holds a machining tool 17a. In the present specification, the machining tool 17a is a tool removing a part of a material, and a cutting tool and a grinding tool are specifically used. The tool holding portion 17 selectively holds the cutting tool and the grinding tool. The machining tool 17a is automatically changeable in a tool housing box 19 25 adjacent to the ram 15. [0021] The bed 11 includes X-axis direction guide rails 11a extending in an X-axis direction on a front surface of its housing, and the moving stand 12 is allowed to reciprocate in the X-axis direction by the X-axis direction guide rails 11a. Along the 30 X-axis direction guide rails 11a, the moving stand 12 is movable in the X-axis 9 direction by motor driving. Further, through the X-axis direction guide rails 11a, a position of the table 13 fixed to the moving stand 12 in the X-axis direction is determined by NC control of an NC unit 18a described below. [0022] 5 The bed 11 further includes Y-axis direction guide rails 11b extending in a Yaxis direction on a top surface of its housing, and the ram 15 is allowed to reciprocate in the Y-axis direction by the Y-axis direction guide rails 11b. Along the Y-axis direction guide rails 11b, the ram 15 is movable in the Y-axis direction by motor driving. Further, through the Y-axis direction guide rails 11b, a position of the 10 machining tool 17a coupled with the ram 15 in the Y-axis direction is determined by NC control of the NC unit 18a described below. [0023] The table 13 fixed to the moving stand 12 is a rotation table rotating around a C axis parallel to a Z axis extending in a vertical direction, and a rotation angle around 15 the C axis is determined by NC control of the NC unit 18a described below. [0024] The ram 15 includes Z-axis direction guide rails 15a extending in the Z-axis direction on a front surface of its housing, and the main shaft portion 16 is allowed to reciprocate in the Z-axis direction by the Z-axis direction guide rails 15a. Along the 20 Z-axis direction guide rails 15a, the main shaft portion 16 is movable in the Z-axis direction by motor driving. Further, through the Z-axis direction guide rails 15a, a position of the machining tool 17a coupled with the main shaft portion 16 in the Z-axis direction is determined by NC control of the NC unit 18a described below. [0025] 25 As described above, in the machining device 10, the table 13 is moved along the X axis and the C axis used as moving axes, and the machining tool 17a is moved along the Y axis and the Z axis used as moving axes. As a result, the workpiece is machined while the workpiece and the machining tool 17a are relatively moved. The combination of the moving axes of each of the table 13 and the machining tool 17a is 30 illustrative, and the table 13 may be moved along the X axis, the Y axis, and the C 10 axis used as moving axes, and the machining tool 17a may be moved along the C axis used as the moving axis. [0026] The machining device 10 further includes a controller 18 controlling the whole 5 of the machining device 10. The controller 18 includes the NC unit 18a exercising NC control. The NC unit 18a is in practice when a central processing unit (CPU) executes a machining program stored in a memory (not illustrated). The memory stores XYZC coordinate data representing positions to be machined of the fixed scroll base material and the orbiting scroll base material. The NC unit 18a exercise 10 positional control of the table 13 and the machining tool 17a and operation control described below of the composite clamp chuck 14 with reference to the XYZC coordinates, and thus machine the fixed scroll base material 1 and the orbiting scroll base material 2. [0027] 15 Next, the composite clamp chuck 14 is described. [0028] Fig. 6 is a schematic cross-sectional view of the composite clamp chuck according to Embodiment 1 of the present disclosure. Fig. 7 is a schematic top view of the composite clamp chuck according to Embodiment 1 of the present disclosure. 20 [0029] The composite clamp chuck 14 is used to selectively fix the fixed scroll base material 1 and the orbiting scroll base material 2 as the workpieces, onto the table 13. The composite clamp chuck 14 includes a pedestal 20, a placement stand 21 on which the workpiece is placed, a fixing portion 22 to fix the fixed scroll base material 25 1, and a fixing portion 23 to fix the orbiting scroll base material 2. The placement stand 21 is fixed onto the pedestal 20 and has an annular shape in a planar view. [0030] The fixing portion 22 includes outer peripheral chucks 22a fixing an outer periphery 1ac (see Fig. 8 and Fig. 9 described below) of the fixed scroll base material 30 1. The outer peripheral chucks 22a are concentrically arranged around a center axis 11 O of the composite clamp chuck 14 at three positions at intervals on an outer periphery of the placement stand 21. The outer peripheral chucks 22a are each movable on the pedestal 20 in a radial direction, and move from an outside to an inside in the radial direction to fix the outer periphery 1ac of the base plate 1a of the 5 fixed scroll base material 1 from three outer directions as illustrated in Fig. 8 and Fig. 9 described below. Inner peripheries 22b of the respective outer peripheral chucks 22a are used as positioning surfaces along the outer periphery 1ac of the base plate 1a of the fixed scroll base material 1, and positioning of the fixed scroll base material 1 to the composite clamp chuck 14 is performed by the positioning surfaces with high 10 accuracy. [0031] The fixing portion 23 is disposed at a center of the placement stand 21, and includes an inner peripheral chuck 24 and clampers 25. The inner peripheral chuck 24 holds the boss portion 2c of the orbiting scroll base material 2 from an inner 15 periphery 2ca of the boss portion 2c. The clampers 25 hold an outer peripheral end surface portion 2d (see Fig. 10 and Fig. 11 described below) of the base plate 2a of the orbiting scroll base material 2. The inner peripheral chuck 24 includes three divided portions 24a that are obtained by radially dividing a columnar part around the center axis O. The divided portions 24a are movable on the pedestal 20 in the radial 20 direction. Around the divided portions 24a, an annular gap 26 into which the boss portion 2c of the orbiting scroll base material 2 is to be inserted is defined between outer peripheral surfaces of the divided portions 24a and an inner peripheral surface of the placement stand 21 in a state where the divided portions 24a are positioned on the inside in the radial direction. The divided portions 24a move from the inside to 25 the outside in the radial direction to fixedly hold the boss portion 2c inserted into the gap 26, from three inner directions. [0032] The clampers 25 are concentrically arranged around the center axis O and in three gaps among the outer peripheral chucks 22a on the outer periphery of the 30 placement stand 21. Each of the clampers 25 includes a post 25a erected on the 12 pedestal 20, and a movable claw 25b that is provided to be movable around an axis of the post 25a, on a top surface of the post 25a. The movable claws 25b are movable to holding positions illustrated by solid lines illustrated in Fig. 7 and retracted positions illustrated by dashed lines illustrated in Fig. 7. 5 [0033] Fixing of the fixed scroll base material 1 and the orbiting scroll base material 2 by the composite clamp chuck 14 configured as described above is described. The number of outer peripheral chucks 22a, the number of inner peripheral chuck 24 and divided portions 24a, and the number of clampers 25 in the above description are 10 illustrative and are not limited to the numbers in the above description. [0034] (Fixing of Fixed Scroll Base Material) Fig. 8 is a schematic cross-sectional view illustrating a state where the fixed scroll base material is fixed to the composite clamp chuck according to Embodiment 1 15 of the present disclosure. Fig. 9 is a schematic plan view illustrating the state where the fixed scroll base material is fixed to the composite clamp chuck according to Embodiment 1 of the present disclosure. To fix the fixed scroll base material 1 to the composite clamp chuck 14, the fixed scroll base material 1 is first placed on the placement stand 21 such that the 20 base plate 1a is in contact with the placement stand 21. At this time, the movable claws 25b of the respective clampers 25 are positioned at the retracted positions. [0035] Next, the outer peripheral chucks 22a of the composite clamp chuck 14 are moved from the outside to the inside in the radial direction, to fix the outer periphery 25 1ac of the fixed scroll base material 1. As illustrated in Fig. 9, the fixed scroll base material 1 is positioned and fixed from three directions by the inner peripheries 22b of the outer peripheral chucks 22a. As a result, a center position of the fixed scroll base material 1 about the center axis O of the composite clamp chuck 14 is determined with high accuracy. Accordingly, a fixed position of each of the fixed 30 scroll base materials 1 sequentially put in the machining device 10 is reproduced with 13 high accuracy. [0036] (Fixing of Orbiting Scroll Base Material) Fig. 10 is a schematic cross-sectional view illustrating a state where the 5 orbiting scroll base material is fixed to the composite clamp chuck according to Embodiment 1 of the present disclosure. Fig. 11 is a schematic plan view illustrating the state where the orbiting scroll base material is fixed to the composite clamp chuck according to Embodiment 1 of the present disclosure. To fix the orbiting scroll base material 2 to the composite clamp chuck 14, the 10 orbiting scroll base material 2 is first disposed such that the base plate 2a is in contact with the placement stand 21 and the boss portion 2c is inserted into the gap 26. At this time, the movable claws 25b of the respective clampers 25 are positioned at the retracted positions. Next, the divided portions 24a of the inner peripheral chuck 24 are moved from the inside to the outside in the radial direction, to fix the 15 boss portion 2c from the three directions. Finally, the movable claws 25b of the respective clampers 25 are moved to the holding positions to hold the outer peripheral end surface portion 2d of the base plate 2a. [0037] The above-described operation of the outer peripheral chucks 22a, the inner 20 peripheral chuck 24, and the clampers 25 is controlled by the NC unit 18a. [0038] As described above, the composite clamp chuck 14 includes the fixing portion 22 and the fixing portion 23 respectively corresponding to the fixed scroll base material 1 and the orbiting scroll base material 2. Further, the composite clamp 25 chuck 14 selectively fixes the fixed scroll base material 1 and the orbiting scroll base material 2 to the table 13 by using the fixing portion 22 and the fixing portion 23. This makes it possible to fix the fixed scroll base material 1 and the orbiting scroll base material 2 different in outer shape from each other, onto the table 13 without additionally using a jig as in the related art. Accordingly, it is possible to avoid 30 occurrence of attachment error of the jig, and to improve machining accuracy. 14 [0039] The composite clamp chuck 14 fixes the orbiting scroll base material 2 by using two types of fixing mechanisms, the inner peripheral chuck 24 and the clampers 25. The reason is as follows. The boss portion 2c is used as a center reference in 5 machining of the orbiting scroll base material 2. To prevent the position of the orbiting scroll base material 2 from being changed by vibration applied in the machining, it is necessary to fix the boss portion 2c of the orbiting scroll base material 2 by fixing force stronger than a machining load applied in the machining. When the fixing is performed only by the inner peripheral chuck 24, the orbiting scroll base 10 material 2 is deformed because the fixing force acting on the boss portion 2c is excessively strong. Fig. 12 illustrates the state of the deformation. [0040] Fig. 12 is an explanatory diagram of a state where the orbiting scroll base material is deformed. 15 When the fixing force acting on the boss portion 2c by the inner peripheral chuck 24 is excessively strong, the orbiting scroll base material 2 is deformed in a convex shape toward the scroll lap 2b as illustrated in Fig. 12. To avoid such deformation of the orbiting scroll base material 2, the composite clamp chuck 14 fixes the outer peripheral end surface portion 2d of the base plate 2a at positions other 20 than the boss portion 2c, and secures fixing force stronger than the machining load by total fixing force at the two positions. At this time, the fixing force by the inner peripheral chuck 24 is set such that fixing force at which a deformation amount of the orbiting scroll base material 2 caused by the fixing force acting on the boss portion 2c is less than an allowable value. The deformation amount of the orbiting scroll base 25 material 2 is, for example, a rising amount L3 of the base plate 2a in the center axis O after the deformation. A measurement position of the deformation amount is not limited to the above-described position, and the deformation amount may be a change amount of a distal end position of the scroll lap. [0041] 30 Fig. 13 is a flowchart of a machining method by the machining device 15 according to Embodiment 1 of the present disclosure. In the machining method of Embodiment 1, a step of producing the fixed scroll 100 from the fixed scroll base material 1 and a step of producing the orbiting scroll 200 from the orbiting scroll base material 2 are alternately performed. The fixed 5 scroll 100 and the orbiting scroll 200 alternately produced by the machining device 10 are delivered to an outside of the machining device 10, are combined as illustrated in Fig. 5 at a delivery destination, and are stored as a pair. As described above, the fixed scroll 100 and the orbiting scroll 200 are alternately produced, which makes it possible to reduce difference in machining accuracy caused by difference in abrasion 10 degree of the machining tool 17a. When the fixed scrolls 100 are successively produced and the orbiting scrolls 200 are then successively produced, the abrasion degree of the machining tool 17a is different between a time when production of the fixed scrolls 100 is started and a time when production of the orbiting scrolls is started, which causes difference in machining accuracy between the fixed scroll 100 15 and the orbiting scroll 200 combined as a pair. The machining method of Embodiment 1 makes it possible to avoid such inconvenience. [0042] The machining method is described in more detail below. First, the fixed scroll base material 1 is carried in the machining device 10 from 20 outside by a carry-in and carry-out device (not illustrated) (step S1). Next, the machining device 10 fixes the fixed scroll base material 1 onto the table 13 by the composite clamp chuck 14 (step S2). To fix the fixed scroll base material 1, the outer peripheral chucks 22a are used as described above. Subsequently, the machining device 10 machines portions including the above-described important 25 portions to be machined of the fixed scroll base material 1 by using the machining tool 17a (step S3), to produce the fixed scroll 100. [0043] When machining the tooth crest portion 52 and the bottom land portion 50, the machining device 10 performs machining by continuously moving the machining tool 30 17a from +Z direction toward −Z direction. This makes it possible to adjust the lap 16 height L1 of the fixed scroll 100 with high accuracy. After the above-described machining is completed, the fixed scroll 100 is detached from the composite clamp chuck 14, and is carried out to the outside by the carry-in and carry-out device (step S4). These are the steps of producing the fixed scroll 100 from the fixed scroll base 5 material 1. [0044] Subsequently, the orbiting scroll base material 2 is carried in the machining device 10 from the outside by the carry-in and carry-out device (step S5). Next, the machining device 10 fixes the orbiting scroll base material 2 onto the table 13 by the 10 composite clamp chuck 14 (step S6). To fix the orbiting scroll base material 2, the inner peripheral chuck 24 and the clampers 25 are used as described above. Subsequently, the machining device 10 machines portions including the abovedescribed important portions to be machined of the orbiting scroll base material 2 by using the machining tool 17a (step S7), to produce the orbiting scroll 200. When 15 machining the tooth crest portion 62 and the bottom land portion 60 in production of the orbiting scroll 200, the machining device 10 also performs machining by continuously moving the machining tool 17a from +Z direction toward −Z direction. This makes it possible to adjust the lap height L2 of the orbiting scroll 200 with high accuracy. These are the steps of producing the orbiting scroll 200 from the orbiting 20 scroll base material 2. [0045] The machining device 10 machines the fixed scroll base material 1 and the orbiting scroll base material 2 by using the same machining tool 17a. In other words, in the machining in each of step S3 and step S7, cutting and grinding are performed 25 as described above, and the same machining tool 17a is used in both of the cutting in step S3 and the cutting in step S7. Likewise, the same machining tool 17a is used in both of the grinding in step S3 and the grinding in step S7. As described above, the fixed scroll base material 1 and the orbiting scroll base material 2 are machined by the same machining tool 17a, which makes it possible to reduce difference in 30 machining accuracy caused by difference in abrasion degree of the machining tool 17 17a when different machining tools are used. [0046] As described above, in Embodiment 1, the composite clamp chuck 14 that selectively fixes the fixed scroll base material 1 and the orbiting scroll base material 2 5 different in outer shape from each other, onto the table 13 is provided. The composite clamp chuck 14 includes the fixing portion 22 and the fixing portion 23 respectively corresponding to the fixed scroll base material 1 and the orbiting scroll base material 2. Further, the composite clamp chuck 14 selectively fixes the fixed scroll base material 1 and the orbiting scroll base material 2 onto the table 13 by 10 using the fixing portion 22 and the fixing portion 23. [0047] Therefore, a jig adjusting the difference between the outer shapes of the fixed scroll base material 1 and the orbiting scroll base material 2 is unnecessary when the fixed scroll base material 1 and the orbiting scroll base material 2 are fixed onto the 15 table 13. This makes it possible to avoid deterioration in machining accuracy caused by an error occurred in attachment of the jig, and to reduce the machining error of each of the fixed scroll base material 1 and the orbiting scroll base material 2. As a result, it is possible to adjust the lap height of the scroll lap of each of the fixed scroll base material 1 and the orbiting scroll base material 2 with high accuracy. When the 20 lap heights of the scroll laps are adjusted with high accuracy, the axial gap 4 when the fixed scroll base material 1 and the orbiting scroll base material 2 are combined is minimized possible, which contributes to manufacture of a high-performance compressor. [0048] 25 In Embodiment 1, the fixed scroll base material 1 includes the base plate 1a having the circular outer periphery 1ac, and the scroll lap 1b erected from the base plate 1a. The fixing portion 22 corresponding to the fixed scroll base material 1 includes the outer peripheral chucks 22a holding the outer periphery 1ac of the fixed scroll base material 1. As described above, holding the outer periphery 1ac of the 30 fixed scroll base material 1 by the outer peripheral chucks 22a makes it possible to fix 18 the fixed scroll base material 1 onto the table 13. [0049] In Embodiment 1, the orbiting scroll base material 2 includes the circular base plate 2a having the outer diameter different from the outer diameter of the fixed scroll 5 base material 1, the scroll lap 2b erected from one of the surfaces of the base plate 2a, and the cylindrical boss portion 2c provided on the other surface. The fixing portion 23 corresponding to the orbiting scroll base material 2 includes the inner peripheral chuck 24 holding the boss portion 2c of the orbiting scroll base material 2 from the inner periphery 2ca of the boss portion 2c, and the clampers 25 holding the 10 outer peripheral end surface portion 2d of the base plate 2a of the orbiting scroll base material 2. As described above, the orbiting scroll base material 2 is allowed to be fixed at the two positions of the inner periphery 2ca of the boss portion 2c of the orbiting scroll base material 2 and the outer peripheral end surface portion 2d of the base plate 2a of the orbiting scroll base material 2. Further, fixing the orbiting scroll 15 base material 2 at the two positions makes it possible to prevent deformation of the orbiting scroll base material 2 in fixing. [0050] In Embodiment 1, the holding force of the inner peripheral chuck 24 is set such that the deformation amount of the orbiting scroll base material 2 caused by the 20 holding force acting on the boss portion 2c is less than the allowable value. The allowable value is 1 μm. This makes it possible to prevent deformation of the orbiting scroll base material 2. [0051] In Embodiment 1, the machining device 10 includes the main shaft portion 16 25 holding the machining tool 17a, and the NC unit 18a. The NC controller 18 exercises numerical control with the X axis, the Y axis, and the Z axis orthogonal to one another, and the C axis that is a rotational axis parallel to the Z axis extending in the vertical direction, as the moving axes. The NC unit 18a specifies the positions to be machined of the fixed scroll base material 1 and the orbiting scroll base material 2 30 with reference to the coordinate data of each of the moving axes, and controls the 19 positions of the main shaft portion 16 and the table 13. This makes it possible to relatively move the scroll base materials and the machining tool 17a and to machine the scroll base materials. [0052] 5 In Embodiment 1, the main shaft portion 16 includes the tool holding portion 17 that selectively holds the cutting tool and the grinding tool as the machining tool 17a. Therefore, it is possible to perform the cutting and the grinding by using the cutting tool and the grinding tool. [0053] 10 The machining method of Embodiment 1 includes the step of producing the first scroll from the first scroll base material and the step of producing the second scroll from the second scroll base material. The steps of producing the first scroll include the step of fixing the first scroll base material onto the table by using the fixing portion of the composite clamp chuck provided corresponding to the first scroll base material, 15 and the step of machining the first scroll base material fixed onto the table. The steps of producing the second scroll include the step of fixing the second scroll base material onto the table by using the fixing portion of the composite clamp chuck provided corresponding to the second scroll base material, and the step of machining the second scroll base material fixed onto the table. 20 [0054] As described above, each of the steps of producing the respective scroll base materials includes the step of fixing the corresponding scroll parts. To fix the scroll parts, the fixing portion provided corresponding to each of the scroll base materials in the composite clamp chuck is used. Therefore, a jig adjusting the difference 25 between the outer shapes of the scroll base materials is unnecessary to fix each of the scroll base materials onto the table. This makes it possible to avoid deterioration in machining accuracy caused by an error occurred in attachment of the jig, and to reduce the machining error of each of the scroll base materials. As a result, it is possible to adjust the lap height of the scroll lap of each of the scroll base materials 30 with high accuracy. When the lap heights of the scroll laps are adjusted with high 20 accuracy, the axial gap when the scroll base materials are combined is minimized possible, which contributes to manufacture of a high-performance compressor. [0055] In the machining method of Embodiment 1, the step of producing the first scroll 5 and the step of producing the second scroll are alternately performed. This makes it possible to reduce machining error caused by abrasion of the tool. [0056] The machining method of Embodiment 1 uses the same machining tool in the step of machining the first scroll base material and the step of machining the second 10 scroll base material. This makes it possible to reduce difference in machining accuracy caused by difference in abrasion degree of the machining tool when different machining tools are used. [0057] Although the embodiment of the present disclosure has been described above, 15 the present disclosure is not limited to the above-described embodiment. For example, in the embodiment, the machining of the fixed scroll base material is performed before the machining of the orbiting scroll base material; however, the machining of the orbiting scroll base material may be performed before the machining of the fixed scroll base material. 20 Reference Signs List [0058] 1: fixed scroll base material, 1a: base plate, 1aa: disc portion, 1ab: wall portion, 1ac: outer periphery, 1b: scroll lap, 2: orbiting scroll base material, 2a: base plate, 2b: scroll lap, 2c: boss portion, 2ca: inner periphery, 2d: outer peripheral end surface 25 portion, 3: compression chamber, 4: axial gap, 10: machining device, 11: bed, 11a: Xaxis direction guide rail, 11b: Y-axis direction guide rail, 12: moving stand, 13: table, 14: composite clamp chuck, 15: ram, 15a: Z-axis direction guide rail, 16: main shaft portion, 17: tool holding portion, 17a: machining tool, 18: controller, 18a: NC unit, 19: tool housing box, 20: pedestal, 21: placement stand, 22: fixing portion, 22a: outer 30 peripheral chuck, 22b: inner periphery, 23: fixing portion, 24: inner peripheral chuck, 21 24a: divided portion, 25: clamper, 25a: post, 25b: movable claw, 26: gap, 50: bottom land portion, 51: tooth side surface portion, 52: tooth crest portion, 60: bottom land portion, 61: tooth side surface portion, 62: tooth crest portion, 100: fixed scroll, 200: orbiting scroll 5 22 We Claim: [Claim 1] A scroll machining device configured to machine a scroll base material by a machining tool by relatively moving the machining tool and the scroll base material 5 fixed onto a table, the scroll machining device comprising a composite clamp chuck including a fixing portion provided corresponding to a first scroll base material and a fixing portion provided corresponding to a second scroll base material, and configured to selectively fix the first scroll base material and the second scroll base material onto the table by using the fixing portions, the first scroll base material and the second 10 scroll base material being each used as the scroll base material and being different in outer shape from each other. [Claim 2] The scroll machining device of claim 1, wherein the first scroll base material includes a base plate having a circular outer 15 periphery, and a scroll lap erected from the base plate, and the fixing portion corresponding to the first scroll base material is an outer peripheral chuck configured to hold the circular outer periphery of the first scroll base material. [Claim 3] 20 The scroll machining device of claim 1 or 2, wherein the second scroll base material includes a base plate that has a circular shape and an outer diameter different from an outer diameter of a base plate of the first scroll base material, a scroll lap erected on one of surfaces of the base plate, and a boss portion that has a cylindrical shape and is provided on an other surface of the 25 base plate, and the fixing portion corresponding to the second scroll base material includes an inner peripheral chuck configured to hold the boss portion of the second scroll base material from an inner periphery of the boss portion, and a clamper configured to hold an outer peripheral end surface portion of the base plate of the second scroll base 30 material. 23 [Claim 4] The scroll machining device of claim 3, wherein holding force by the inner peripheral chuck is set such that a deformation amount of the second scroll base material caused by the holding force acting on the boss portion is less than an 5 allowable value. [Claim 5] The scroll machining device of claim 4, wherein the allowable value is 1 μm. [Claim 6] The scroll machining device of any one of claims 1 to 5, further comprising: 10 a main shaft portion configured to hold the machining tool; and an NC unit configured to exercise numerical control with an X axis, a Y axis, and a Z axis orthogonal to one another, and a C axis that is a rotational axis parallel to the Z axis extending in a vertical direction, as moving axes, wherein the NC unit is configured to specify positions to be machined of the first scroll 15 base material and the second scroll base material with reference to coordinate data of each of the moving axes, and control positions of the main shaft portion and the table. [Claim 7] The scroll machining device of claim 6, wherein the main shaft portion includes a tool holding portion configured to selectively hold a cutting tool and a grinding tool 20 as the machining tool. [Claim 8] A machining method using the scroll machining device of any one of claims 1 to 7, the machining method comprising: producing a first scroll from the first scroll base material; and 25 producing a second scroll from the second scroll base material, wherein the producing the first scroll includes fixing the first scroll base material onto the table by using the fixing portion of the composite clamp chuck provided corresponding to the first scroll base material, and machining the first scroll base material fixed onto the table, and 30 the producing the second scroll includes fixing the second scroll base material 24 onto the table by using the fixing portion of the composite clamp chuck provided corresponding to the second scroll base material, and machining the second scroll base material fixed onto the table. [Claim 9] 5 The machining method of claim 8, wherein the producing the first scroll and the producing the second scroll are alternately performed. [Claim 10] The machining method of claim 8 or 9, wherein the machining tool is unchanged and used both in the machining the first scroll base material and in the 10 machining the second scroll base material