阅读说明：本技术 涡旋件加工装置和加工方法 (Scroll machining device and machining method ) 是由 须藤有亮 朴木继雄 于 2019-03-13 设计创作，主要内容包括：本发明的涡旋件加工装置是使加工工具和固定于工作台上的涡旋件基材相对移动来通过加工工具加工涡旋件基材的装置。涡旋件加工装置具备复合夹紧卡盘。复合夹紧卡盘具有与被用作涡旋件基材的外型不同的第1涡旋件基材和第2涡旋件基材分别对应设置的固定部,并使用各固定部来将第1涡旋件基材和第2涡旋件基材选择性地固定于工作台上。(The scroll machining device of the present invention is a device for machining a scroll base material by a machining tool by relatively moving the machining tool and the scroll base material fixed to a table. The scroll machining device is provided with a composite clamping chuck. The composite clamp chuck has fixing parts respectively corresponding to a 1 st scroll base material and a 2 nd scroll base material which are used as scroll base materials and have different shapes, and the 1 st scroll base material and the 2 nd scroll base material are selectively fixed on a workbench by using the fixing parts.)

1. A scroll machining device for machining a scroll base material by a machining tool by moving the machining tool relative to the scroll base material fixed to a table,

the scroll machining apparatus is characterized in that,

the scroll compressor is provided with a composite clamping chuck which is provided with fixing parts corresponding to a 1 st scroll base material and a 2 nd scroll base material which are used as the scroll base materials and have different shapes, and the 1 st scroll base material and the 2 nd scroll base material are selectively fixed on the workbench by using the fixing parts.

2. A scroll machining apparatus as claimed in claim 1,

the 1 st scroll base material includes: a platen having a circular outer periphery; and swirl teeth provided upright from the platen,

the fixing portion corresponding to the 1 st scroll base is an outer peripheral chuck for chucking the outer periphery of the 1 st scroll base.

3. A scroll machining apparatus as claimed in claim 1 or claim 2,

the 2 nd scroll base material has: a circular platen having an outer diameter different from that of the 1 st scroll base material; vortex teeth vertically arranged on one surface of the bedplate; and a cylindrical protrusion formed on the other surface,

the fixing portion corresponding to the 2 nd scroll base material includes an inner peripheral chuck for holding the projection of the 2 nd scroll base material from the inner peripheral side, and a clamper for holding the outer peripheral side end surface portion of the platen of the 2 nd scroll base material.

4. A scroll machining apparatus as claimed in claim 3,

the holding force provided by the inner peripheral chuck is set such that the amount of deformation of the 2 nd scroll base material caused by the holding force acting on the projection is not equal to or greater than an allowable value.

5. A scroll machining apparatus as claimed in claim 4,

the allowable value is 1 μm.

6. A scroll machining device as claimed in any one of claims 1 to 5, comprising:

a main shaft portion that holds the machining tool; and

an NC unit for performing numerical control using X, Y, and Z axes orthogonal to each other and a C axis, which is a rotation axis parallel to the Z axis in the vertical direction, as a movement axis,

the NC unit controls the positions of the main shaft portion and the table by determining the machining positions of the 1 st scroll base material and the 2 nd scroll base material based on the coordinate data of the respective moving axes.

7. A scroll machining apparatus as claimed in claim 6,

the main shaft portion has a tool holding portion that selectively holds a cutting tool and a grinding tool as the machining tool.

8. A machining method using the scroll machining device according to any one of claims 1 to 7, comprising:

a step of forming a 1 st scroll from the 1 st scroll base material; and

a step of forming a 2 nd scroll from the 2 nd scroll base material,

the step of forming the 1 st scroll includes:

fixing the 1 st scroll base material to the table using the fixing portion of the composite clamp chuck provided corresponding to the 1 st scroll base material; and

a step of processing the 1 st scroll base material fixed to the table,

the step of forming the 2 nd scroll includes:

fixing the 2 nd scroll base material to the table using the fixing portion of the composite clamp chuck provided corresponding to the 2 nd scroll base material; and

and a step of machining the 2 nd scroll base material fixed to the table.

9. The process according to claim 8,

the step of forming the 1 st scroll and the step of forming the 2 nd scroll are alternately performed.

10. The processing method according to claim 8 or 9,

in the step of machining the 1 st scroll material and the step of machining the 2 nd scroll material, the same machining tool is used.

Technical Field

The present invention relates to a scroll machining apparatus and a machining method for machining a scroll in a scroll compressor used for refrigeration, air conditioning, and the like.

Background

A scroll compressor combines a fixed scroll with an oscillating scroll to form a compression chamber that compresses fluid. In a scroll compressor, in order to prevent fluid leakage from a compression chamber, it is necessary to machine a fixed scroll and an oscillating scroll with high accuracy.

Conventionally, as a device for machining a scroll member, there is a machining device including a table on which a workpiece is fixed and a tool table disposed around the table at intervals in a circumferential direction (see, for example, patent document 1). In patent document 1, a table is rotated, a machining surface of a workpiece fixed to the table is sequentially moved to positions facing respective tool tables, and the workpiece is machined by a machining tool held by the tool tables. The workpiece is a scroll base material having a structure in which a spiral wrap is provided upright on a platen, and the scroll base material is roughly and finely machined on each tool table.

Patent document 1: japanese laid-open patent publication No. 10-328957

The fixed scroll and the oscillating scroll used in the scroll compressor have different shapes, and correspondingly, the scroll base materials used to manufacture them have different shapes. However, in the machining device described in patent document 1, no study has been made on the case where scroll base materials having different shapes are to be machined. Therefore, when the fixing portion is configured according to the outer shape of the fixed scroll base material when the scroll base material is fixed to the table, it is necessary to fix the fixed scroll base material to the table after attaching a jig for aligning with the outer shape of the fixed scroll base material to the orbiting scroll base material. If a jig is separately required, an error in attachment of the jig or the like is likely to occur, and the machining accuracy may be deteriorated.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object thereof is to provide a scroll machining device and a scroll machining method capable of machining scroll base materials having different shapes with high accuracy.

The scroll machining device according to the present invention is a scroll machining device for machining a scroll base material by a machining tool by relatively moving the machining tool and the scroll base material fixed to a table, and includes a composite clamp chuck having fixing portions provided corresponding to a 1 st scroll base material and a 2 nd scroll base material having different shapes to be used as the scroll base material, respectively, and selectively fixing the 1 st scroll base material and the 2 nd scroll base material to the table using the fixing portions.

According to the present invention, the composite clamp chuck is provided in which the 1 st scroll base material and the 2 nd scroll base material having different shapes are selectively fixed to the table by the corresponding fixing portions. Thus, even if the shape of the 1 st scroll base material differs from that of the 2 nd scroll base material, the respective scroll base materials can be selectively fixed to the table without using a separate jig, and the machining accuracy can be improved.

Drawings

Fig. 1 is a schematic front view of a processing apparatus according to embodiment 1 of the present invention.

Fig. 2 is a schematic side view of a processing apparatus according to embodiment 1 of the present invention.

Fig. 3 is a cross-sectional view of a fixed scroll base material machined by the machining apparatus according to embodiment 1 of the present invention.

Fig. 4 is a cross-sectional view of an orbiting scroll base material machined by the machining apparatus according to embodiment 1 of the present invention.

Fig. 5 is a view showing a state in which a fixed scroll made of the fixed scroll base material of fig. 1 and an oscillating scroll made of the oscillating scroll base material of fig. 2 are combined.

Fig. 6 is a schematic cross-sectional view of a composite clamp chuck according to embodiment 1 of the present invention.

Fig. 7 is a schematic plan view of the composite clamp chuck according to embodiment 1 of the present invention.

Fig. 8 is a schematic cross-sectional view showing a state in which a fixed scroll base is fixed to a composite clamp chuck according to embodiment 1 of the present invention.

Fig. 9 is a schematic plan view showing a state in which a fixed scroll base is fixed to the composite clamp chuck according to embodiment 1 of the present invention.

Fig. 10 is a schematic cross-sectional view showing a state in which an oscillating scroll base material is fixed to a composite clamp chuck according to embodiment 1 of the present invention.

Fig. 11 is a schematic plan view showing a state in which an oscillating scroll base material is fixed to a composite clamp chuck according to embodiment 1 of the present invention.

Fig. 12 is an explanatory view of a deformed state of the orbiting scroll base.

Fig. 13 is a flowchart of a machining method by the machining apparatus according to embodiment 1 of the present invention.

Detailed Description

Hereinafter, a scroll machining device (hereinafter, simply referred to as a machining device) according to an embodiment of the present invention will be described with reference to the drawings. Here, in the following drawings, the same or corresponding components denoted by the same reference numerals are common throughout the embodiments described below. The form of the constituent elements shown throughout the specification is merely an example, and is not limited to the form described in the specification.

(embodiment mode 1)

Fig. 1 is a schematic front view of a processing apparatus according to embodiment 1 of the present invention. Fig. 2 is a schematic side view of a processing apparatus according to embodiment 1 of the present invention.

The machining device 10 according to embodiment 1 machines workpieces having different shapes, that is, the 1 st scroll base material and the 2 nd scroll base material, as machining targets. In embodiment 1, the 1 st scroll base is a fixed scroll base which is a material for forming the 1 st scroll, that is, a fixed scroll of a scroll compressor. The 2 nd scroll base material is an oscillating scroll base material used as a material for forming an oscillating scroll of the scroll compressor, which is the 2 nd scroll. The configuration of the processing apparatus 10 will be described later.

Fig. 3 is a cross-sectional view of a fixed scroll base material machined by the machining apparatus according to embodiment 1 of the present invention. Fig. 4 is a cross-sectional view of an orbiting scroll base material machined by the machining apparatus according to embodiment 1 of the present invention.

As shown in fig. 3, the fixed scroll base 1 includes a platen 1a and a spiral wrap 1b provided upright from one surface of the platen 1 a. The platen 1a has a circular disk portion 1aa and a wall portion 1ab standing from the outer peripheral portion of the disk portion 1 aa. The platen 1a of the fixed scroll base 1 shown in fig. 1 has a structure having a disc portion 1aa and a wall portion 1ab, but may be a type of fixed scroll base 1 without the wall portion 1 ab. In summary, the platen 1a has an outer shape having a circular outer periphery. Important machining sites for machining the fixed scroll base 1 include a land portion 50 which is one surface of the platen 1a, a land portion 51 which is a side surface of the spiral wrap 1b, and a crest portion 52 which is a tip surface of the spiral wrap 1b and is parallel to the land portion 50.

As shown in fig. 4, the orbiting scroll base 2 includes a platen 2a, spiral teeth 2b provided upright from one surface of the platen 2a, and a cylindrical projection 2c formed on the other surface of the platen 2 a. Important machining sites for machining the orbiting scroll base 2 include a land portion 60 which is one surface of the platen 2a, a land portion 61 which is a side surface of the spiral wrap 2b, and a crest portion 62 which is a tip surface of the spiral wrap 2b and is parallel to the land portion 60.

The machining device 10 according to embodiment 1 performs cutting corresponding to a machining allowance and cutting (or grinding) as final finishing on the fixed scroll base 1 and the orbiting scroll base 2. The fixed scroll and the orbiting scroll which are manufactured by performing these processes are combined as shown in fig. 5 below in the manufacturing process of the scroll compressor.

Fig. 5 is a view showing a state in which a fixed scroll made of the fixed scroll base material of fig. 1 and an oscillating scroll made of the oscillating scroll base material of fig. 2 are combined.

The fixed scroll 100 and the oscillating scroll 200 are combined in such a manner that the spiral wraps 1b and 2b are engaged. The compression chamber 3 is formed by combining the fixed scroll 100 and the oscillating scroll 200.

In fig. 5, by forming the land height L1 of the fixed scroll 100 and the land height L2 of the orbiting scroll 200 with high accuracy, the axial gap 4, which is the gap between the wrap of one of the fixed scroll 100 and the orbiting scroll 200 and the platen of the other scroll, can be minimized. The axial slits 4 are required to be as small as possible because they serve as leakage flow paths for the compressed fluid from the inside to the outside of the compression chamber 3.

As shown in fig. 3 and 4, the fixed scroll base 1 and the orbiting scroll base 2 to be carried into the machining device 10 of embodiment 1 have different shapes. Specifically, the outer shape differs in that the outer diameter of the platen 1a of the fixed scroll base 1 is larger than the outer diameter of the platen 2a of the orbiting scroll base 2, and the thickness of the platen 1a of the fixed scroll base 1 is thicker than the thickness of the platen 2a of the orbiting scroll base 2. The processing apparatus 10 according to embodiment 1 is characterized by including a composite clamp chuck that can selectively fix the fixed scroll base 1 and the orbiting scroll base 2 having different shapes to the table without using a jig for aligning the shapes.

The machining device 10 will be described below with reference to fig. 1 and 2.

The machining device 10 is a Numerical Control (NC) machine tool having an automatic tool replacement function, and specifically, is a machining center, a compound lathe, or the like, for example.

As shown in fig. 1, the processing apparatus 10 includes: a machine base 11 constituting a machining apparatus main body; a mobile station 12 disposed on the front side of the machine base 11; a table 13 fixed to the movable table 12 and holding a workpiece; and a composite clamping chuck 14 fixed to the table 13. The machining device 10 further includes: a ram 15 disposed on the upper surface side of the machine base 11; a main shaft portion 16 disposed on the front surface side of the ram 15; and a tool holding portion 17 provided at a lower end portion of the main shaft portion 16 and holding a machining tool 17 a. The machining tool 17a is a tool for removing a part of a material in the present specification, and specifically, a cutting tool and a grinding tool are used. The tool holding portion 17 selectively holds a cutting tool and a grinding tool. The machining tool 17a can be automatically replaced in the tool storage box 19 adjacent to the ram 15.

The machine base 11 has an X-axis direction guide rail 11a extending in the X-axis direction on the front surface of the housing, and the movable table 12 can reciprocate in the X-axis direction by the X-axis direction guide rail 11 a. The X-axis guide 11a can move the moving stage 12 in the X-axis direction by driving a motor. The X-axis guide 11a can estimate the position of the table 13 fixed to the moving stage 12 in the X-axis direction by NC control of an NC unit 18a, which will be described later.

The table 11 has a Y-axis guide 11b extending in the Y-axis direction on the upper surface of the housing, and the ram 15 can reciprocate in the Y-axis direction by the Y-axis guide 11 b. The Y-axis direction guide 11b can move the ram 15 in the Y-axis direction by driving a motor. The Y-axis direction guide 11b can estimate the Y-axis direction position of the machining tool 17a coupled to the indenter 15 by NC control of the NC unit 18a, which will be described later.

The table 13 fixed to the moving table 12 is a rotating table that rotates about a C axis parallel to a Z axis in the vertical direction, and can estimate a rotation angle about the C axis by NC control of an NC unit 18a described later.

The ram 15 has a Z-axis guide 15a extending in the Z-axis direction on the front surface of the housing, and the spindle unit 16 can reciprocate in the Z-axis direction by the Z-axis guide 15 a. The Z-axis guide 15a can move the main shaft 16 in the Z-axis direction by driving a motor. The Z-axis guide 15a can estimate the Z-axis position of the machining tool 17a coupled to the spindle unit 16 by NC control of an NC unit 18a, which will be described later.

As described above, in the machining device 10, the table 13 is moved with the X axis and the C axis as the movement axes, and the machining tool 17a is moved with the Y axis and the Z axis as the movement axes. Thereby, the workpiece and the machining tool 17a are moved relatively to each other to machine the workpiece. Further, a combination of the respective moving axes of the table 13 and the machining tool 17a is an example, and may be configured such that: the table 13 has the X, Y, and C axes as the movement axes, and the machining tool 17a has the C axis as the movement axis.

The machining device 10 further includes a controller 18 that controls the entire machining device 10. The control unit 18 includes an NC unit 18a that performs NC control. The NC section 18a is realized by a CPU (Central Processing Unit) executing a machining program stored in a storage section (not shown). The storage unit stores XYZC coordinate data indicating machining positions of the fixed scroll base and the orbiting scroll base. The NC unit 18a performs position control of the table 13 and the machining tool 17a based on the xyz coordinates, and performs operation control of the composite clamp chuck 14, which will be described later, thereby machining the fixed scroll base 1 and the orbiting scroll base 2.

Next, the composite clamping chuck 14 will be explained.

Fig. 6 is a schematic cross-sectional view of a composite clamp chuck according to embodiment 1 of the present invention. Fig. 7 is a schematic plan view of the composite clamp chuck according to embodiment 1 of the present invention.

The composite clamp chuck 14 is used to selectively fix the fixed scroll base 1 and the orbiting scroll base 2 as workpieces to the table 13. The composite clamp chuck 14 includes a base 20, a mounting base 21 which is fixed to the base 20 and has a ring shape in a plan view on which a workpiece is mounted, a fixing portion 22 for fixing the fixed scroll base 1, and a fixing portion 23 for fixing the orbiting scroll base 2.

The fixed portion 22 includes an outer peripheral chuck 22a for fixing an outer periphery 1ac (see fig. 8 and 9 described later) of the fixed scroll base 1. The outer circumference chucks 22a are arranged at 3 locations at intervals concentrically around the central axis O of the composite chuck 14 on the outer circumference of the mounting table 21. Each outer peripheral chuck 22a is movable on the base 20 in the radial direction, and moves from the radially outer side to the radially inner side, thereby fixing the outer periphery 1ac of the platen 1a of the fixed scroll base 1 from 3 outer directions as shown in fig. 8 and 9 described later. The inner periphery 22b of the outer peripheral chuck 22a is a positioning surface along the outer periphery 1ac of the platen 1a of the fixed scroll base 1, and the fixed scroll base 1 is positioned with respect to the composite clamp chuck 14 with high accuracy by the positioning surface.

The fixing portion 23 has: an inner circumference chuck 24 which is disposed at the center of the mounting table 21 and holds the projection 2c of the orbiting scroll base material 2 from the inner circumference 2ca side; and a retainer 25 that holds an outer peripheral side end surface portion 2d of the platen 2a of the orbiting scroll base 2 (see fig. 10 and 11 described later). The inner peripheral chuck 24 has 3 dividing portions 24a configured to radially divide a columnar member about the central axis O. The split portion 24a is movable in the radial direction on the base 20. In the divided portion 24a, an annular gap 26 into which the projection 2c of the orbiting scroll base material 2 is inserted is formed between the outer peripheral surface of the divided portion 24a and the inner peripheral surface of the mounting table 21 in a state in which the divided portion 24a is positioned radially inward. The divided portion 24a moves from the radially inner side to the radially outer side, thereby fixedly holding the protruding portion 2c inserted into the slit 26 from 3 directions of the inner side.

In the outer peripheral portion of the mounting table 21, the grippers 25 are arranged concentrically around the center axis O in 3-position gaps between the outer peripheral chucks 22 a. The clamper 25 includes a support column 25a provided upright on the base 20, and a movable claw 25b provided on the upper surface of the support column 25a to be movable about the axis of the support column 25 a. The movable claw 25b is movable to a holding position shown by a solid line and an escape position shown by a broken line in fig. 7.

The fixation of the fixed scroll base 1 and the orbiting scroll base 2 by the composite clamp chuck 14 configured as described above will be described. The number of the outer circumference chucks 22a, the inner circumference chucks 24, the dividing portions 24a, and the grippers 25 in the above description is an example, and the present invention is not limited to this.

(fixation of fixed scroll base)

Fig. 8 is a schematic cross-sectional view showing a state in which a fixed scroll base is fixed to a composite clamp chuck according to embodiment 1 of the present invention. Fig. 9 is a schematic plan view showing a state in which a fixed scroll base is fixed to the composite clamp chuck according to embodiment 1 of the present invention.

In the method of fixing the fixed scroll base material 1 in the composite clamp chuck 14, first, the fixed scroll base material 1 is placed on the mounting table 21 so that the platen 1a is in contact with the mounting table 21. At this time, the movable claw 25b of the gripper 25 is located at the retreat position.

Next, the outer periphery chuck 22a of the composite clamp chuck 14 is moved from the radially outer side to the radially inner side to fix the outer periphery 1ac of the fixed scroll base material 1. As shown in fig. 9, the fixed scroll base 1 is positioned and fixed from 3 directions on the inner circumference 22b of the outer circumference chuck 22 a. This allows the center position of the fixed scroll base 1 to be estimated with high accuracy with respect to the center axis O of the composite clamp chuck 14. Therefore, the reproducibility of the fixing positions of the fixed scroll base materials 1 sequentially loaded into the machining device 10 can be performed with high accuracy.

(fixation of base material of orbiting scroll)

Fig. 10 is a schematic cross-sectional view showing a state in which an oscillating scroll base material is fixed to a composite clamp chuck according to embodiment 1 of the present invention. Fig. 11 is a schematic plan view showing a state in which an oscillating scroll base material is fixed to a composite clamp chuck according to embodiment 1 of the present invention.

In the method of fixing the orbiting scroll base material 2 in the composite clamp chuck 14, first, the orbiting scroll base material 2 is disposed such that the platen 2a abuts against the mounting table 21 and the projection 2c is inserted into the gap 26. At this time, the movable claw 25b of the gripper 25 is located at the retreat position. Next, the divided portions 24a of the inner peripheral chuck 24 are moved from the radially inner side to the radially outer side, and the protrusions 2c are fixed from 3 directions by the inner peripheral chuck 24. Finally, the movable claws 25b of the clamper 25 are moved to the holding position, and the outer peripheral side end surface portion 2d of the platen 2a is held by the movable claws 25b of the clamper 25.

The operation control of the outer peripheral chuck 22a, the inner peripheral chuck 24, and the clamper 25 is performed by the NC section 18 a.

As described above, the composite clamp chuck 14 includes the fixing portion 22 and the fixing portion 23 corresponding to the fixed scroll base 1 and the orbiting scroll base 2, respectively. The composite clamp chuck 14 selectively fixes the fixed scroll base 1 and the orbiting scroll base 2 to the table 13 using the fixing portion 22 and the fixing portion 23. Thus, the fixed scroll base 1 and the orbiting scroll base 2 having different shapes can be fixed to the table 13 without using a separate jig as in the conventional case. Therefore, the occurrence of a mounting error of the jig can be avoided, and the machining accuracy can be improved.

Here, the composite clamp chuck 14 fixes the orbiting scroll base material 2 by using two fixing mechanisms, i.e., an inner peripheral chuck 24 and a clamper 25, for the following reasons. The center reference when the orbiting scroll base material 2 is machined is the projection 2 c. In order to prevent the position of the orbiting scroll base 2 from being changed by vibration applied during machining, it is necessary to fix the projection 2c of the orbiting scroll base 2 with a fixing force stronger than a machining load applied during machining. If the fixing is performed only by the inner peripheral chuck 24, the fixing force acting on the projection 2c becomes too strong, and the orbiting scroll base 2 deforms. The drawing showing a modified case thereof is the following fig. 12.

Fig. 12 is an explanatory view of a deformed state of the orbiting scroll base.

If the fixing force applied to the projection 2c by the inner peripheral chuck 24 is too strong, the orbiting scroll base 2 deforms so as to be convex toward the spiral wrap 2b as shown in fig. 12. In order to avoid such deformation of the orbiting scroll base 2, the composite clamp chuck 14 fixes the outer peripheral side end surface portion 2d of the platen 2a also at a portion other than the projection portion 2c, and secures a fixing force stronger than a machining load by a total fixing force formed by fixing the two portions. Here, the fixing force provided by the inner peripheral chuck 24 is set to a fixing force at which the amount of deformation of the orbiting scroll base 2 due to the fixing force acting on the projection 2c does not become equal to or greater than an allowable value. The deformation amount of the orbiting scroll base 2 is, for example, a floating amount L3 of the platen 2a after deformation on the center axis O. The position of measuring the amount of deformation is not limited to the above position, and may be the amount of change in the tip position of the spiral tooth or the like.

Fig. 13 is a flowchart of a machining method by the machining apparatus according to embodiment 1 of the present invention.

In the processing method of embodiment 1, the step of forming the fixed scroll 100 from the fixed scroll base 1 and the step of forming the oscillating scroll 200 from the oscillating scroll base 2 are alternately performed. The fixed scroll 100 and the orbiting scroll 200 alternately produced by the machining apparatus 10 are transported to the outside of the machining apparatus 10, combined at the transport destination as shown in fig. 5, and stored in pairs. By forming the fixed scroll 100 and the orbiting scroll 200 alternately in this way, variations in machining accuracy due to differences in wear of the machining tool 17a can be suppressed. If the machining method is such that the fixed scroll 100 is continuously manufactured and then the oscillating scroll 200 is continuously manufactured, the machining tool 17a is worn differently between the time of starting the manufacture of the fixed scroll 100 and the time of starting the manufacture of the oscillating scroll, and a deviation occurs in machining accuracy between the fixed scroll 100 and the oscillating scroll 200 combined as a pair. Such a problem can be avoided by the processing method of embodiment 1.

The processing method will be described in more detail below.

First, the fixed scroll base 1 is carried into the machining apparatus 10 from the outside by a carrying-in and carrying-out device (not shown) (step S1). Next, the machining device 10 fixes the fixed scroll base 1 to the table 13 by the composite clamp chuck 14 (step S2). When fixing the fixed scroll base 1, the outer peripheral chuck 22a is used as described above. The machining device 10 uses the machining tool 17a to machine a portion of the fixed scroll base 1 including the important machined portion (step S3), thereby forming the fixed scroll 100.

Here, when machining the tooth top surface portion 52 and the tooth bottom surface portion 50, the machining device 10 performs machining by continuously moving the machining tool 17a from the + Z direction to the-Z direction. This enables the tooth height L1 of the fixed scroll 100 to be machined with high accuracy. After the completion of the above processing, the fixed scroll 100 is removed from the composite clamp chuck 14 and is carried out to the outside by the carrying-in and carrying-out device (step S4). The above is a process of producing the fixed scroll 100 from the fixed scroll base 1.

Next, the orbiting scroll base 2 is carried into the machining device 10 from the outside by the carrying in and out device (step S5). Next, the machining device 10 fixes the orbiting scroll base 2 to the table 13 by the composite clamp chuck 14 (step S6). For fixing the orbiting scroll base 2, the inner circumference chuck 24 and the clamper 25 are used as described above. Then, the machining device 10 uses the machining tool 17a to machine a portion of the orbiting scroll base 2 including the important machined portion described above (step S7), thereby forming the orbiting scroll 200. In the machining device 10, even when the machining tool 17a is moved from the + Z direction to the-Z direction to continuously perform machining when the lap top surface portion 62 and the lap bottom surface portion 60 are machined when the orbiting scroll 200 is manufactured. This enables the tooth height L2 of the orbiting scroll 200 to be machined with high accuracy. The above is a process of forming the orbiting scroll 200 from the orbiting scroll base material 2.

In the machining device 10, the fixed scroll base 1 and the orbiting scroll base 2 are machined by the same machining tool 17 a. That is, in the machining in each of step S3 and step S7, the cutting and the grinding are performed as described above, but the same tool is used for the machining tool 17a used in the cutting in step S3 and the machining tool 17a used in the cutting in step S7. Similarly, the same tool is used for the machining tool 17a used for the grinding in step S3 and the machining tool 17a used for the grinding in step S7. By thus machining the fixed scroll base 1 and the orbiting scroll base 2 with the same machining tool 17a, it is possible to suppress variations in machining accuracy due to differences in wear of the machining tool 17a when different machining tools are used.

As described above, in embodiment 1, the composite clamp chuck 14 is provided in which the fixed scroll base 1 and the orbiting scroll base 2 having different shapes are selectively fixed to the table 13. The composite clamp chuck 14 has a fixing portion 22 and a fixing portion 23 corresponding to the fixed scroll base 1 and the orbiting scroll base 2, respectively. The composite clamp chuck 14 selectively fixes the fixed scroll base 1 and the orbiting scroll base 2 to the table 13 using the fixing portion 22 and the fixing portion 23.

Thus, when the fixed scroll base 1 and the orbiting scroll base 2 are fixed to the table 13, a jig for aligning the outer shapes of the fixed scroll base 1 and the orbiting scroll base 2 is not required. Therefore, it is possible to avoid deterioration of the machining accuracy due to an error generated at the time of mounting the jig, and it is possible to reduce the machining errors of the fixed scroll base 1 and the orbiting scroll base 2. As a result, the tooth heights of the spiral teeth of the fixed scroll base 1 and the orbiting scroll base 2 can be accurately processed. By machining the tooth height of the spiral wrap with high accuracy, the axial gap 4 after combining the fixed scroll base 1 and the orbiting scroll base 2 can be minimized, and this can contribute to the production of a high-performance compressor.

In embodiment 1, the fixed scroll base 1 includes: a platen 1a having a circular outer periphery 1 ac; and swirl teeth 1b provided upright from the platen 1 a. The fixing portion 22 corresponding to the fixed scroll base 1 is an outer periphery chuck 22a which grips the outer periphery 1ac of the fixed scroll base 1. In this way, the outer circumference 1ac of the fixed scroll base 1 is clamped by the outer circumference chuck 22a, whereby the fixed scroll base 1 can be fixed to the table 13.

In embodiment 1, the orbiting scroll base 2 includes a circular base plate 2a having an outer diameter different from that of the fixed scroll base 1, a spiral wrap 2b provided upright from one surface of the base plate 2a, and a cylindrical projection 2c formed on the other surface. The fixed portion 23 corresponding to the orbiting scroll base 2 includes an inner peripheral chuck 24 for holding the projection 2c of the orbiting scroll base 2 from the inner periphery 2ca side, and a clamper 25 for holding the outer peripheral side end surface 2d of the platen 2a of the orbiting scroll base 2. In this way, the orbiting scroll base 2 can be fixed to two locations, i.e., the inner periphery 2ca of the projection 2c of the orbiting scroll base 2 and the outer peripheral end surface 2d of the platen 2 a. Further, by fixing the orbiting scroll base 2 at two locations, deformation of the orbiting scroll base 2 at the time of fixing can be suppressed.

In embodiment 1, the holding force provided by the inner peripheral chuck 24 is set such that the amount of deformation of the orbiting scroll base 2 caused by the holding force acting on the projection 2c does not become equal to or greater than an allowable value. The allowable value is 1 μm. This can suppress deformation of the orbiting scroll base 2.

In embodiment 1, the machining device 10 includes a spindle unit 16 that holds a machining tool 17a, and an NC unit 18 a. The NC control unit 18 performs numerical control with the X, Y, and Z axes orthogonal to each other and the C axis, which is a rotation axis parallel to the Z axis in the vertical direction, as a movement axis. The NC unit 18a determines machining positions of the fixed scroll base 1 and the orbiting scroll base 2 based on coordinate data of the respective moving axes, and controls positions of the main shaft portion 16 and the table 13. This allows the scroll base material to be machined by relatively moving the scroll base material and the machining tool 17 a.

In embodiment 1, the spindle portion 16 includes a tool holding portion 17 that selectively holds a cutting tool and a grinding tool as a machining tool 17 a. Thus, cutting and grinding can be performed using the cutting tool and the grinding tool.

The processing method of embodiment 1 includes a step of forming the 1 st scroll from the 1 st scroll base material and a step of forming the 2 nd scroll from the 2 nd scroll base material. The step of forming the 1 st scroll includes a step of fixing the 1 st scroll base material to the table using a fixing portion of a composite clamp chuck provided corresponding to the 1 st scroll base material, and a step of machining the 1 st scroll base material fixed to the table. The step of forming the 2 nd scroll includes a step of fixing the 2 nd scroll base material to the table using a fixing portion of a composite clamp chuck provided corresponding to the 2 nd scroll base material, and a step of machining the 2 nd scroll base material fixed to the table.

In this way, the step of forming each scroll base includes a step of fixing each scroll member to the table. For this fixing, fixing portions provided corresponding to the composite chuck are used. Therefore, when the scroll base materials are fixed to the table, a jig for aligning the outer shapes of the scroll base materials with each other is not required. Therefore, it is possible to avoid deterioration of the machining accuracy due to an error generated at the time of mounting the jig, and it is possible to reduce the machining error of each scroll base material. As a result, the tooth heights of the spiral teeth of the scroll base materials can be accurately machined. By machining the tooth heights of the spiral teeth with high accuracy, the axial gaps after combining the scroll base materials can be minimized, which contributes to the production of a high-performance compressor.

In the machining method of embodiment 1, the step of forming the 1 st scroll and the step of forming the 2 nd scroll are alternately performed. This can reduce machining errors caused by wear of the tool.

The machining method of embodiment 1 uses the same machining tool in the step of machining the 1 st scroll material and the step of machining the 2 nd scroll material. This makes it possible to suppress variations in machining accuracy due to differences in wear of the machining tools when different machining tools are used.

The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, in the embodiment, the fixed scroll base material is machined before the machining of the orbiting scroll base material, but the fixed scroll base material may be machined before the machining of the orbiting scroll base material.

Description of the reference numerals

1 … fixed scroll base material; 1a … platen; 1aa … disc portion; 1ab … wall portion; 1ac … periphery; 1b … swirl vanes; 2 … base material of the oscillating scroll; 2a … platen; 2b … swirl vanes; 2c … protrusions; 2ca … inner circumference; 2d … outer peripheral end surface portion; 3 … compression chamber; 4 … axial slits; 10 … processing device; 11 … machine; 11a … X-axis direction guide rails; 11b … Y-axis direction guide rails; 12 … mobile station; 13 … a workbench; 14 … composite clamping chuck; 15 … indenter; 15a … Z-axis direction guide rails; 16 … a main shaft portion; 17 … tool holding part; 17a … machining tool; 18 … control section; 18a … NC section; 19 … tool storage case; 20 … stand-off; 21 … a loading table; 22 … a fixed part; 22a … peripheral chuck; 22b … inner circumference; 23 … a fixed part; 24 … inner circumference chuck; a 24a … division; 25 … clamp holder; 25a … strut; 25b … movable jaw; 26 … slits; 50 … bottom surface portion of tooth; 51 … tooth side parts; 52 … a top flank portion; 60 … bottom surface of tooth; 61 … tooth flank; 62 … crown portion; 100 … fixed scroll; 200 … swing scroll members.