JPWO2020070893A1 - Machining tools and burnishing equipment - Google Patents

Abstract

The present invention relates to a machining tool for holding a burnishing shaft used in a burnishing apparatus for burnishing the inner surface of a groove formed from the inner peripheral surface to the outer side of a tubular work. The processing tool includes a support portion that supports both ends of the burnishing shaft without fixing them.

Description

The present invention relates to a processing tool and a burnishing processing apparatus used in a burnishing processing apparatus that performs burnishing on the inner surface of a groove formed from the inner peripheral surface of the tubular body toward the outside.

Generally, the cylinder of a rotary compressor has a tubular shape having a through hole in the central portion, and the cylinder is formed with a vane mounting groove extending in the radial direction from the inner peripheral surface. A vane is slidably arranged in the vane mounting groove, and the vane reciprocates in the vane mounting groove while contacting the outer surface of the eccentric ring arranged in the through hole of the cylinder. In a rotary compressor equipped with such a cylinder and a vane, in order to improve the slidability of the vane and obtain a highly efficient compressor, the inner surface of the vane mounting groove is machined with surface roughness, flatness, etc. Extremely high processing accuracy such as parallelism and groove width is required.

As a finishing device for the inner surface of such a vane mounting groove, for example, there is a device of Patent Document 1. Patent Document 1 discloses a burnishing apparatus including a burnishing shaft having a diameter larger than the width of the vane mounting groove. Patent Document 1 has a processing tool that holds a burnishing shaft in a cantilevered manner. Then, by moving the machining tool and reciprocating while pressing the burnishing shaft against the inner surface of the vane mounting groove, the inner surface of the vane mounting groove is slightly plastically deformed, and the inner surface of the vane mounting groove is convex. Burnishing is performed to improve the part.

Japanese Unexamined Patent Publication No. 2015-226971

In the burnishing apparatus of Patent Document 1, as described above, the burnishing shaft is cantilevered and held by the machining tool. Therefore, the burnishing shaft may bend during machining, and the center line of the vane mounting groove may deviate from the center axis of the burnishing shaft. If the vanishing shaft enters the vane mounting groove in such a state, the vanishing shaft does not have a function of following the center line of the vanishing groove, so that the vanishing shaft has a vanishing groove. It is strongly pressed against one of the inner surfaces. For this reason, there is a problem that uneven wear occurs on the surface of the burnishing shaft, which shortens the tool life.

The present invention has been made to solve the above-mentioned problems, and is used to burnish the inner surface of a groove formed from the inner peripheral surface to the outer side of a tubular work. It is an object of the present invention to obtain a machining tool and a burnishing machine capable of suppressing uneven wear and improving the tool life.

The machining tool according to the present invention is a machining tool for holding a burnishing shaft used in a burnishing apparatus for burnishing the inner surface of a groove formed from the inner peripheral surface of a tubular work to the outside. , It is equipped with a support portion that supports both ends of the burnishing shaft without fixing it.

According to the machining tool of the present invention, since the burnishing shaft is supported by both sides, it is possible to prevent the burnishing shaft from bending significantly during machining. Therefore, local uneven wear on the surface of the burnishing shaft can be prevented, and the tool life can be improved.

It is a schematic block diagram of the burnishing processing apparatus which concerns on Embodiment 1 of this invention. It is a schematic perspective view which shows the state which the tubular worm is mounted on the work holding apparatus of the burnishing processing apparatus which concerns on Embodiment 1 of this invention. It is a perspective view of the tubular work processed by the burnishing processing apparatus which concerns on Embodiment 1 of this invention. It is schematic sectional drawing of the processing tool of the burnishing processing apparatus which concerns on Embodiment 1 of this invention. It is a schematic perspective view of the processing tool of the burnishing processing apparatus which concerns on Embodiment 1 of this invention. It is schematic cross-sectional view which shows the dimensional relationship of the processing tool of the burnishing processing apparatus which concerns on Embodiment 1 of this invention. It is a top view which shows the dimensional relationship of the tubular work processed by the burnishing processing apparatus which concerns on Embodiment 1 of this invention. FIG. 5 is a schematic perspective view showing a main part of a burnishing machine before burnishing of a tubular work machined by the burnishing device according to the first embodiment of the present invention. It is a schematic plan view which shows the relationship between the vanishing shaft and the vane mounting groove which is processing the tubular work which is processed by the vanishing processing apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between the radial position of the vane mounting groove and the surface flatness before and after processing using the burnishing processing apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the shape of the shaft surface after processing 153.6 m / piece using the conventional cantilever fixing type processing tool. It is a figure which shows the shape of the shaft surface after processing 2304 m / piece by using the processing tool of the both ends support system which concerns on Embodiment 1 of this invention. It is a figure which shows the difference of the surface pressure depending on the presence or absence of uneven wear of the surface of the shaft for burnishing processing. It is schematic cross-sectional view of the processing tool of the burnishing processing apparatus which concerns on Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same parts are designated by the same reference numerals.

Embodiment 1.
FIG. 1 is a schematic configuration diagram of a burnishing apparatus according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view showing a state in which a tubular worm is mounted on a work holding device of the burnishing device according to the first embodiment of the present invention. FIG. 3 is a schematic perspective view of a tubular work machined by the burnishing machine according to the first embodiment of the present invention.
First, the configuration of the burnishing apparatus 100 according to the first embodiment will be described with reference to FIG. The burnishing processing device 100 includes a tool moving device 10 that performs burnishing while moving the processing tool 30 relative to the tubular work to be machined, and a work holding device 40 that holds the tubular work. .. Here, the burnishing process is a process of slightly plastically deforming the surface to be processed to improve the convex portion of the surface to be processed. In this specification, a case where the tubular work to be machined is the cylinder 1 of the rotary compressor as shown in FIG. 2 and the surface to be machined is the vane mounting groove 5 will be described as an example.

The tool moving device 10 includes a machining tool 30, an elevating portion 11 to which the machining tool 30 is fixed and elevates up and down, and a slide table 12 that moves the elevating portion 11 in the vertical direction. Further, the tool moving device 10 includes a ball screw 13 for moving the slide table 12, a driving device 14 for driving the ball screw 13, a guide 15 for holding the slide table 12, and a main body guide 16 for supporting the guide 15. And have. The tool moving device 10 further drives a slide table 17 for moving the main body guide 16 in the horizontal direction, a ball screw 18 for moving the slide table 17, a guide 19 for holding the slide table 17, and a ball screw 18. It includes a drive device 20. In the tool moving device 10 configured in this way, as shown by an arrow in FIG. 1, the machining tool 30 moves in the vertical direction due to the rotation of the ball screw 13, and the machining tool 30 moves in the vertical direction due to the rotation of the ball screw 18. It is configured to move in the left-right direction of.

Next, the work holding device 40 will be described with reference to FIGS. 1 and 2.
Three work holding devices 40 are arranged here on the stage 41 and the stage 41, and the same number as the work receiving stage 42 on which the cylinder 1 is placed and the work receiving stage 42 are provided, and the cylinder 1 is placed on the work receiving stage 42. It is provided with a work holding portion 43 for holding down the cylinder.

A first positioning pin 44 is attached to one of the two work receiving stages 42a on the right back side (right side in FIG. 1) of the three work receiving stages 42. A second positioning pin 45 is attached to the remaining work receiving stage 42b. By inserting the first reference hole 3 and the second reference hole 4 formed in the cylinder 1 into the first positioning pin 44 and the second positioning pin 45, the cylinder 1 is positioned horizontally on the work receiving stage 42. Will be installed. Further, the upper surface of the cylinder 1 is pressed by the work holding portion 43 to prevent the cylinder 1 from floating during the burnishing process.

By installing the cylinder 1 on the stage 41 with the phase fixed by the first positioning pin 44 and the second positioning pin 45 in this way, the transfer operation to the subsequent process such as the deburring process of the vane mounting groove 5 can be performed. Easy to do. That is, it is not necessary to re-phase the cylinder 1 when the cylinder 1 is put into the stage in the subsequent process, and the through hole 2 of the cylinder 1 is grasped by the transport chuck (not shown) on the current stage 41. The phase of the cylinder 1 can be easily transferred to the stage in the subsequent process.

As shown in FIGS. 2 and 3, the cylinder 1 has a cylindrical shape having a through hole 2 in the center, and a vane mounting groove 5 is formed in the radial direction from the inner peripheral surface to the outside. The vane mounting groove 5 is a space for the vane to slide during operation of the rotary compressor. If the surface texture of the inner surface of the vane mounting groove 5 is rough, when the vane reciprocates in the vane mounting groove 5, the sliding resistance increases due to the catching of the convex portions on the surface texture, and the cylinder 1 is used. It is not preferable to do so. Therefore, the inner surface of the vane mounting groove 5 needs to be burnished with high precision.

Next, the machining tool 30 will be described.
FIG. 4 is a schematic cross-sectional view of a processing tool of the burnishing processing apparatus according to the first embodiment of the present invention. FIG. 5 is a schematic perspective view of a processing tool of the burnishing processing apparatus according to the first embodiment of the present invention.

The machining tool 30 includes a mounting shaft 32 attached to the elevating portion 11 of the tool moving device 10, and a supporting portion 33 fixed to the lower end portion of the mounting shaft 32 and supporting the burnishing shaft 31. The burnishing shaft 31 has a diameter R (R [μm] ≤ A [μm] + ΔA [μm]) larger than the groove width A (see FIG. 7 described later) of the vane mounting groove 5 of the cylinder 1 to be machined. It is configured. Further, the burnishing shaft 31 is made of a material harder than the cylinder 1.

The support portion 33 is fastened by the fastening member 36 in a state where the first support member 34 that supports one end of the burnishing shaft 31 and the second support member 35 that supports the other end are separated from each other in the axial direction of the mounting shaft 32. Has a structure. The fastening member 36 only needs to be able to fasten the first support member 34 and the second support member 35, and is composed of a bolt 36a and a nut 36b, but the configuration is arbitrary.

The first support member 34 is formed with a first insertion hole 37a into which one end of the burnishing shaft 31 is inserted. Further, the second support member 35 is formed with a second insertion hole 37b into which the other end of the burnishing shaft 31 is inserted. The diameters D of the first insertion hole 37a and the second insertion hole 37b are the same, and have a diameter larger than the diameter R of the burnishing shaft 31 (D [mm] ≤ R [mm] + ΔR [mm]). As described above, by having the relationship of D [mm] ≤ R [mm] + ΔR [mm], the burnishing shaft 31 is not fixed to the support portion 33, and both ends are simply the first insertion holes 37a and It is supported by the support portion 33 in a state of being inserted into the second insertion hole 37b. Since there is a clearance of ΔR between the burnishing shaft 31 and each of the first insertion hole 37a and the second insertion hole 37b, the burnishing shaft 31 moves horizontally within this clearance. Is possible.

Next, the dimensional relationship between the machining tool 30 and the cylinder 1 will be described.
FIG. 6 is a schematic cross-sectional view showing the dimensional relationship of the processing tool of the burnishing processing apparatus according to the first embodiment of the present invention. FIG. 7 is a plan view showing the dimensional relationship of the tubular work machined by the burnishing machine according to the first embodiment of the present invention.
The width W of the machining tool 30 has a diameter (W [mm] ≦ B [mm] −ΔB [mm]) smaller than the diameter B of the through hole 2 of the cylinder 1. The width L between the first support member 34 and the second support member 35 of the machining tool 30 is larger than the thickness E of the cylinder 1 (see FIG. 3) (L [mm] ≤ E [mm] + ΔE [mm]. ])have.

Next, a burnishing method for the inner surface of the vane mounting groove 5 of the cylinder 1 using the machining tool 30 will be described.

FIG. 8 is a schematic perspective view showing a main part of the burnishing apparatus before the burnishing of the tubular workpiece processed by the burnishing apparatus according to the first embodiment of the present invention. FIG. 9 is a schematic plan view showing the relationship between the burnishing shaft and the vane mounting groove during machining of the tubular work machined by the burnishing apparatus according to the first embodiment of the present invention. In FIG. 9, the white arrow indicates the moving direction of the burnishing shaft 31.

First, the drive device 20 is driven to move the slide table 17, and as shown in FIG. 8, the central shaft 30c of the machining tool 30 (see FIG. 6) and the center 2c of the through hole 2 of the cylinder 1 (see FIG. 7). The machining tool 30 is moved to the point where is matched with. After that, the drive device 14 is driven to move the slide table 12, and the elevating portion 11 to which the machining tool 30 is attached is lowered. Specifically, the elevating portion 11 is lowered to a position where the burnishing shaft 31 held by the machining tool 30 faces the inner peripheral surface of the cylinder 1. After that, the drive device 20 is driven to move the main body guide 16, the guide 15, the elevating part 11, and the machining tool 30, and the burnishing shaft 31 is made to enter the vane mounting groove 5.

Here, when the vanishing shaft 31 is brought into the vanishing groove 5, as shown in FIG. 9, the center line 5c of the vanishing groove 5 and the center axis 31c of the vanishing shaft 31 are misaligned. Think. In this case, the burnishing shaft 31 is strongly pressed against one side of the inner surface of the vane mounting groove 5. However, the burnishing shaft 31 has a clearance of ΔR with respect to the first insertion hole 37a and the second insertion hole 37b of the support portion 33 as described above. Therefore, when the vanishing shaft 31 enters the vane mounting groove 5, the central shaft 31c moves in the horizontal direction following the vane mounting groove 5 so that the central shaft 31c coincides with the center line 5c of the vane mounting groove 5.

Then, the burnishing shaft 31 enters the vane mounting groove 5 in a state where the central shaft 31c of the burnishing shaft 31 coincides with the center line 5c of the vane mounting groove 5, and the machining proceeds. As a result, the surface of the inner surface of the vane mounting groove 5 is smoothed and finished into a smooth surface, and the surface of the inner surface of the vane mounting groove 5 can be burnished uniformly and with high accuracy.

FIG. 10 is a diagram showing the relationship between the radial position of the vane mounting groove and the surface flatness before and after processing using the burnishing processing apparatus according to the first embodiment of the present invention. FIG. 10A shows the surface flatness [μm] according to the radial position [mm] of the vane mounting groove 5 before the burnishing process. FIG. 10B shows the surface flatness [μm] according to the radial position [mm] of the vane mounting groove 5 after the burnishing process.
It can be seen that the surface flatness of the inner surface of the vane mounting groove 5 after the burnishing process is such that the convex portions on the surface are equalized as compared with those before the processing, and the surface shape is smooth with few convex portions.

By the way, the diameters D of the first insertion hole 37a and the second insertion hole 37b into which the burnishing shaft 31 is inserted are larger by ΔR than the diameter R of the burnishing shaft 31 as described above. , ΔR has an appropriate range. In FIG. 9, consider a case where the value of the dimension F is 0.4 mm and the central axis 31c of the burnishing shaft 31 and the center line 5c of the vane mounting groove 5 are displaced by about 0.1 mm in the radial direction. Here, the dimension F is the length of the edge portion formed by the through hole 2 and the vane mounting groove 5 in the circumferential direction.

In this case, when the value of ΔR is 0.5 mm or more, the burnishing shaft 31 interferes with the inner peripheral surface of the through hole 2 excluding the edge portion formed by the through hole 2 and the vane mounting groove 5, and has a tubular shape. There is a high possibility that the work will be scratched. Therefore, the optimum value of ΔR in this case is set to 0.4 mm ± 0.1. The optimum value of ΔR described here is a value with respect to the cylinder 1 of the rotary compressor. Therefore, when machining a groove formed from the inner peripheral surface of another tubular work toward the outside, there is no problem even if ΔR is appropriately selected according to the dimensions of the tubular work.

Further, both ends of the burnishing shaft 31 have a clearance between the first insertion hole 37a and the second insertion hole 37b to support both sides, as in the conventional cantilever fixing method. In addition, it is possible to prevent the burnishing shaft 31 from bending significantly during processing. Therefore, it is possible to prevent local uneven wear of the surface of the burnishing shaft 31.

Further, since both ends of the burnishing shaft 31 are not fixed, the burnishing shaft 31 is rotatable in the circumferential direction during machining. Therefore, it is possible to uniformly press the entire circumference of the burnishing shaft 31 against the vane mounting groove 5. Therefore, it is possible to prevent local uneven wear of the surface of the burnishing shaft 31 as compared with the conventional cantilever fixing method, greatly improve the tool life, and perform burnishing with high accuracy.

FIG. 11 is a diagram showing the shape of the shaft surface after machining at 153.6 m / piece using a conventional cantilever fixing type machining tool. FIG. 12 is a diagram showing the shape of the shaft surface after machining at 2304 m / piece by using the machining tool of the double-ended support type according to the first embodiment of the present invention. Note that 153.6 m / piece indicates that the cumulative machining length per burnishing shaft is 153.6 m. 2304m / book has the same meaning. The processing length per work is 0.0768 m.

As shown in FIG. 11, when a conventional machining tool is used, uneven wear occurs on the surface of the burnishing shaft 31 after machining 153.6 m / piece. However, as shown in FIG. 12, when the machining tool 30 according to the first embodiment is used, uneven wear does not occur on the surface of the burnishing shaft 31 even after machining of 2304 m / piece, and the tool life You can see the improvement of.

FIG. 13 is a diagram showing a difference in surface pressure depending on the presence or absence of uneven wear on the surface of the burnishing shaft. FIG. 13A shows a case where there is no uneven wear on the surface of the burnishing shaft 31. FIG. 13B shows a case where the surface of the burnishing shaft 31 has uneven wear. Further, in FIG. 13, the arrows indicate the surface pressure distribution.
As shown in FIG. 13A, when there is no uneven wear on the surface of the burnishing shaft 31, the contact between the burnishing shaft 31 and the inner surface 5a of the vane mounting groove 5 is the contact between the cylinder and the flat surface. Become. Therefore, the surface pressure at the central portion of the cylinder becomes high, and the amount of improvement of the convex portion, which is the amount of plastic deformation during the burnishing process, becomes large.

On the other hand, as shown in FIG. 13B, when the surface of the burnishing shaft 31 is unevenly worn and a flat surface is formed on the surface of the burnishing shaft 31, the burnishing shaft 31 and the vane are formed. The contact with the inner side surface 5a of the mounting groove 5 is the contact between the flat surfaces. Therefore, the surface pressure becomes low, and the amount of improvement of the convex portion, which is the amount of plastic deformation during the burnishing process, also becomes small. If uneven wear occurs on the surface of the burnishing shaft 31 in this way, the machining capacity deteriorates, which leads to a decrease in tool life. Therefore, the machining tool 30 of the first embodiment, which can prevent uneven wear, is effective in improving the tool life.

As described above, in the machining tool 30 of the first embodiment, both ends of the burnishing shaft 31 have a clearance between each of the first insertion hole 37a and the second insertion hole 37b of the support portion 33. It has a structure that supports both sides. Therefore, it is possible to prevent the burnishing shaft 31 from bending significantly during processing, and it is possible to prevent local uneven wear on the surface of the burnishing shaft 31. Therefore, the tool life can be greatly improved. Further, since it is possible to prevent a large deflection of the burnishing shaft 31 during machining, the entire surface of the inner side surface of the vane mounting groove 5 can be uniformly burnished with high accuracy. Therefore, the surface texture of the inner surface of the vane mounting groove 5 can be finished as a smooth surface with few protrusions as shown in FIG.

Further, since the burnishing shaft 31 is rotatable in the circumferential direction, the entire circumference of the burnishing shaft 31 can be uniformly pressed against the vane mounting groove 5 during machining. Therefore, from this point as well, local uneven wear of the surface of the burnishing shaft 31 can be prevented, the tool life can be greatly improved, and burnishing can be performed with high accuracy. Moreover, since the tool life can be improved, mass production can be performed at low cost as a result.

The friction coefficient of the inner surface of the vane mounting groove 5 is reduced in the cylinder 1 in which the inner surface of the vane mounting groove 5 is finished by using the burnishing device 100 of the first embodiment. In the rotary compressor using the cylinder 1 in which the friction coefficient of the inner surface of the vane mounting groove 5 is reduced in this way, the vane does not get caught in the convex portion of the inner surface of the vane mounting groove 5 during operation, and the vane mounting groove 5 It can be slid inside. Therefore, it is possible to obtain a rotary compressor having high vane slidability, high efficiency and high performance.

In the first embodiment, a case has been described in which the machining tool 30 can be raised and lowered in the thickness direction of the cylinder 1 and can be moved in the horizontal direction. However, the present invention is not limited to the above configuration, and if relatively similar movement is possible, such as fixing the machining tool 30 side and making the cylinder 1 side movable in the thickness direction and the horizontal direction. The composition does not matter.

Embodiment 2.
The second embodiment has a structure in which a part of the component parts of the machining tool according to the first embodiment is integrated. Hereinafter, the points where the second embodiment is different from the first embodiment will be mainly described, and the configurations not described in the second embodiment are the same as those in the first embodiment.

FIG. 14 is a schematic cross-sectional view of a processing tool of the burnishing processing apparatus according to the second embodiment of the present invention.
The machining tool 50 of the second embodiment has a structure in which a mounting shaft 51 attached to the elevating portion 11 of the tool moving device 10 and a support portion 52 that supports both ends of the burnishing shaft 31 are integrated. In the support portion 52, a first insertion hole 52a and a second insertion hole 52b extending in the axial direction of the mounting shaft 51 are formed coaxially with each other. The second insertion hole 52b is opened in the lower end surface 52c of the support portion 52, and the burnishing shaft 31 is inserted through this opening. Then, the pressing plate 53 is fixed to the lower end surface 52c of the support portion 52 by the fastening bolt 54 so that the burnishing shaft 31 does not fall out from this opening.

The first insertion hole 52a and the second insertion hole 52b are separated from each other in the axial direction of the mounting shaft 51, and both ends of the burnishing shaft 31 are inserted into the first insertion hole 52a and the second insertion hole 52b to support the first insertion hole 52a and the second insertion hole 52b. Has been done. The first insertion hole 52a and the second insertion hole 52b have a clearance of ΔR between the first insertion hole 37a and the second insertion hole 37b of the first embodiment and the burnishing shaft 31. ..

According to the machining tool 50 according to the second embodiment configured as described above, the same effect as that of the first embodiment can be obtained, and the support portion 52 is, so to speak, the first support member 34 and the first support member 34 of the first embodiment. Since the structure is integrated with the two support members 35, the following effects can be obtained. That is, if the first support member 34 and the second support member 35 are separate bodies, it is necessary to adjust so that the first insertion hole 37a and the second insertion hole 37b are coaxial when assembling the machining tool 30. .. This is because the burnishing shaft 31 is tilted if it is not coaxial, so that the burnishing shaft 31 enters the vane mounting groove 5 with the burnishing shaft 31 tilted during machining, so that the burnishing can be performed with high accuracy. Cannot be implemented.

On the other hand, the machining tool 50 of the second embodiment has a structure in which a first insertion hole 52a for supporting one end of the burnishing shaft 31 and a second insertion hole 52b for supporting the other end are formed in one member. Yes, coaxial is secured. Therefore, coaxial adjustment is not required at the time of tool change, and the tool can be easily changed in a short time. Further, in the second embodiment, since the coaxiality between the first insertion hole 52a and the second insertion hole 52b is secured, the inconvenience of tilting the burnishing shaft 31 can be avoided, and high-precision burnishing can be easily performed. be able to.

Further, the machining tool 50 of the second embodiment has a structure in which the mounting shaft 51 and the support portion 52 are integrated. In other words, the structure is such that the mounting shaft 32, the first support member 34, the second support member 35, and the fastening member 36 of the first embodiment are integrated. By forming the integrated structure in this way, the rigidity of the machining tool 50 can be increased as compared with the structure in which these are separated. Since the rigidity of the machining tool 50 can be increased, the tool can be easily replaced.

Although the burnishing shaft 31 is inserted from the lower part of the machining tool 50 in FIG. 14, it may be inserted from the upper part of the machining tool 50. The configuration is not limited as long as the burnishing shaft 31 can be easily inserted into the first insertion hole 52a and the second insertion hole 52b.

1 Cylinder, 2 Through hole, 2c Center of through hole, 3 1st reference hole, 4 2nd reference hole, 5 vane mounting groove, 5a inner surface, 5c center line, 10 tool moving device, 11 lifting part, 12 slide table , 13 ball screw, 14 drive unit, 15 guide, 16 main body guide, 17 slide table, 18 ball screw, 19 guide, 20 drive unit, 30 machining tool, 30c central shaft, 31 burnishing shaft, 31c central shaft, 32 Mounting shaft, 33 support part, 34 1st support member, 35 2nd support member, 36 fastening member, 36a bolt, 36b nut, 37a 1st insertion hole, 37b 2nd insertion hole, 40 work holding device, 41 stage, 42 Work receiving stage, 42a Work receiving stage, 42b Work receiving stage, 43 Work holding part, 44 1st positioning pin, 45 2nd positioning pin, 50 Machining tool, 51 Mounting shaft, 52 Support part, 52a 1st insertion hole, 52b Second insertion hole, 52c lower end surface, 53 holding plate, 54 fastening bolt.

The machining tool 30 includes a mounting shaft 32 attached to the elevating portion 11 of the tool moving device 10, and a supporting portion 33 fixed to the lower end portion of the mounting shaft 32 and supporting the burnishing shaft 31. Burnishing shaft 31, the processing target (see FIG. 7 described later) width A of the groove of the vane attachment groove 5 of the cylinder 1 diameter larger than R (R [m m] ≦ A [m m] + ΔA [m m ]). Further, the burnishing shaft 31 is made of a material harder than the cylinder 1.

Claims (6)

A machining tool that holds a burnishing shaft used in a burnishing machine that burnishes the inner surface of a groove formed from the inner peripheral surface of a tubular work to the outside.
A machining tool provided with a support portion that supports both ends of the burnishing shaft without fixing it. The support portion includes a first support member that supports one end of the burnishing shaft, a second support member that supports the other end of the burnishing shaft, and the first support member and the second support member. The processing tool according to claim 1, further comprising a fastening member to be fastened. The first support member is formed with a first insertion hole into which one end of the burnishing shaft is inserted, and the second support member is provided with a second insertion hole into which the other end of the burnishing shaft is inserted. The machining tool according to claim 2, which is formed. The diameter of each of the first insertion hole and the second insertion hole is larger than the diameter of the burnishing shaft, and between each of the first insertion hole and the second insertion hole and the burnishing shaft. The processing tool according to claim 3, wherein the vanishing shaft is supported with a clearance. Claims 2 to 2 include a mounting shaft to be attached to the tool moving device of the burnishing apparatus, and the mounting shaft, the first support member, the second support member, and the fastening member are integrally formed. The machining tool according to any one of claims 4. A burnishing apparatus provided with the machining tool according to any one of claims 1 to 5.

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