JP6613958B2 - Processing tool and processing device - Google Patents

Description

  The present invention relates to a machining tool and a machining apparatus for machining an inner peripheral surface of a hole of a workpiece, such as a honing tool and a honing machine.

  Conventionally, for example, when a recess is formed on the inner peripheral surface of a hole provided in a workpiece such as a bore of a cylinder block, the workpiece is rotated by turning using a dedicated cutting tool. In machining with such a cutting tool, one point or a line of the cutting tool comes into contact with the surface to be processed, so that escape due to rebounding is likely to occur. In addition, as the cutting tool wears, the clearance gradually increases and the accuracy of the recess processing decreases, so it is necessary to replace the cutting tool periodically.

  However, since the cutting tool is worn quickly in the above-mentioned turning process, the replacement frequency of the cutting tool is high, and the processing cost is high. In addition, it takes time to replace the workpiece, resulting in a problem that the work processing efficiency of the workpiece is lowered.

  Therefore, as described in Patent Document 1, for example, there is known a processing apparatus that performs honing using a grindstone instead of turning. In this processing apparatus, by rotating and reciprocating the honing tool, the inner peripheral surface of the work is processed while expanding the grindstone of the honing tool with the tapered cone portion. As the taper cone portion descends, the grindstone base metal expands and the grindstone surface is pressed against the inner peripheral surface. Further, as the taper cone portion rises, the grindstone base metal returns to the center direction by the biasing action toward the inside of the ring spring.

JP 2008-114346 A

  However, in the processing apparatus described in Patent Document 1, a ring spring is required to return the grindstone and the grindstone base metal to their original positions, and there is a problem that the apparatus configuration becomes complicated due to an increase in the number of parts. It was.

  The present invention has been created in view of the above points, and an object of the present invention is to be able to efficiently process, for example, a depression or the like on the inner peripheral surface of the hole of the workpiece by a simple configuration. To provide a processing tool and a processing apparatus.

The processing tool of the present invention is a processing tool that is mounted on a honing processing device (101, 103) and performs honing processing on the inner peripheral surface (W11, W31) of the hole of the workpiece (W1, W3). A cylindrical portion (21, 22, 23), an inner shaft (31, 33), a processed portion (41, 51), a tapered cone portion (312, 332, 334), and a contact portion (313) are provided. .

The outer cylinder portion has a hollow cylindrical shape and includes communication portions (211, 221, 231) that allow the internal space and the external space to communicate in the radial direction. The inner shaft is inserted inside the outer cylinder portion so as to be relatively movable in the axis (C) direction of the outer cylinder portion and rotatable integrally with the outer cylinder portion. The processing portion is disposed on the outer periphery of the inner shaft so as to face the inner peripheral surface, has a grindstone surface (421), and discharge grooves (61, 62, 63, 64) formed on the grindstone surface, and has an inner peripheral surface. Process.

  The tapered cone portion is provided on the inner shaft and has a tapered shape in the insertion direction (A) of the inner shaft. When the inner shaft slides in the insertion direction with respect to the outer cylinder portion, the processed portion is inserted into the communication portion. The processed portion and the tapered surface (314) are brought into contact with each other so as to be pushed outward in the radial direction of the outer cylinder portion. The abutment part is provided integrally with the inner shaft on the insertion direction side of the taper cone part. When the inner shaft slides in the withdrawal direction (B) opposite to the insertion direction, the processed part can be biased in the withdrawal direction. Next, it abuts on the end surface (433, 512) on the insertion direction side of the processed portion.

  In the outer tube portion, the end surface on the withdrawal direction side of the communication portion is formed as a first inclined surface (212, 222) that is inclined with respect to a virtual plane (V) orthogonal to the axis so as to approach the axis as it goes in the withdrawal direction. Has been.

When the inner shaft slides in the retracted direction, the end surface facing the first inclined surface in the processed portion is slidable in contact with the first inclined surface and can move in the radially inward direction of the outer tube portion, and the end surface becomes an axial line toward the retracted direction. It forms as a 2nd inclined surface (432,511) inclined with respect to the virtual plane so that it may approach. A plurality of processing parts are arranged radially on the outer periphery of the inner shaft, and the contact part has a blade-like part that contacts one processing part as many as the number of processing parts.

  According to the configuration of the present invention, when the inner shaft slides in the withdrawal direction, the contact portion contacts the end surface of the processing portion. The processed portion is urged in the retracting direction by the contact portion, and the second inclined surface of the processed portion is slidably contacted along the first inclined surface, and the processed portion is drawn in the radially inward direction of the outer cylinder portion. That is, as the inner shaft moves in the retracting direction, the processed portion can be automatically returned to the original position in the outer cylinder portion. In this way, processing can be performed with a simple structure without using a member such as a spring.

  Also, in the dimple processing that forms a dimple on the inner peripheral surface of the hole, if the machined part is a honing grindstone with a grindstone surface, the replacement frequency due to wear of the cutting tool is reduced compared to turning using a cutting tool. And processing efficiency can be improved.

The whole schematic diagram which shows the honing processing apparatus by 1st Embodiment of this invention. It is the II section enlarged view of FIG. 1, Comprising: The axial direction sectional drawing which shows a part of honing tool. The top view which shows the honing tool in process. IV-IV sectional view taken on the line of FIG. The figure which shows the one aspect in the hollow process by the honing processing apparatus by 1st Embodiment. The figure which shows the one aspect in the hollow process by the honing processing apparatus by 1st Embodiment. The figure which shows the one aspect in the hollow process by the honing processing apparatus by 1st Embodiment. The figure which shows the one aspect in the hollow process by the honing processing apparatus by 1st Embodiment. An axial direction sectional view showing a part of electrolytic processing device by a 2nd embodiment of the present invention, and showing typically a tip of an electrolytic processing tool typically. The top view which shows an electrolytic processing tool. The schematic diagram which shows the front-end | tip of the honing processing apparatus by other embodiment, especially a honing tool. In other embodiment, it is a schematic diagram which shows the aspect during the hollow process by a honing processing apparatus, (a) shows before a hollow is formed, (b) shows after a hollow is formed. The cross-sectional schematic diagram which shows the front-end | tip of the honing processing apparatus by other embodiment, especially a honing tool. The schematic diagram which shows the groove | channel formed in the grindstone surface by other embodiment.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
[Constitution]
A honing apparatus 101 as a processing apparatus according to the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the honing apparatus 101 of the present embodiment includes a rotation main shaft 1, a main shaft rotation drive unit 2, a main shaft reciprocation drive unit 3, an inner shaft reciprocation drive unit 4, a tool attachment unit 5, a control unit 6, and A honing tool 11 is mainly provided. The honing apparatus 101 rotates and reciprocates the honing tool 11 in the axial direction, and moves the grindstone 42 (see FIG. 2) provided on the outer periphery thereof in the radial direction, thereby forming a hole in the workpiece W1 as a workpiece. Indentation is performed by pressing the inner peripheral surface W11 with a predetermined pressure.

  In the following description, the honing tool 11 is the side attached to the rotary main shaft 1, and the upper side shown in FIGS. 1 to 4 will be described as the base end side in the axial direction and the lower side will be described as the front end side in the axial direction. In FIG. 3, the workpiece W1 is omitted, and only the honing tool 11 is shown.

  First, the configuration of the honing tool 11 will be described. As shown in FIG. 2, the honing tool 11 mainly includes an outer cylinder portion 21, an inner shaft 31, and a honing grindstone 41. The outer cylinder portion 21 has a hollow cylindrical shape, and three slits 211 having a rectangular shape in a side view are radially formed near the tip in the axial direction at equal intervals in the circumferential direction. The slit 211 as the communication portion communicates the internal space and the external space of the outer cylinder portion 21 in the radial direction.

  The slit 211 holds a honing grindstone 41, which will be described later, so as to protrude and retract in the radial direction. In the outer cylinder part 21, the end surface on the proximal end side of the slit 211 is formed as a first inclined surface 212 inclined with respect to a virtual plane V extending in the radial direction so as to approach the axis C toward the proximal end side. . In addition, the axis C of the outer cylinder part 21 and the axis of the inner peripheral surface W11 of the workpiece W coincide with each other.

  The inner shaft 31 is accommodated in the inner space of the outer cylinder portion 21. The inner shaft 31 has a main body portion 311 having a cylindrical bar shape, a tapered cone portion 312 and a contact plate 313 continuously from the proximal end in the axial direction to the distal end side. The diameter of the main body portion 311 is slightly smaller than the diameter of the inner space of the outer cylinder portion 21, and is configured to be slidably guided in the inner space.

  The tapered cone portion 312 has a tapered shape in which the diameter gradually decreases from the proximal end side toward the distal end side, and the outer surface is formed as a tapered surface 314. The contact plate 313 as a contact portion is a circular plate-like member, and is provided integrally with the tapered cone portion 312 with a screw (not shown) with a circular plane 315 aligned with a direction orthogonal to the axis. ing. The tapered cone portion 312 and the contact plate 313 may be formed by integral molding without using a screw. The diameter of the contact plate 313 is formed to be substantially the same as the diameter of the main body portion 311.

  Three honing grindstones 41 as processing portions are provided on the outer periphery of the tapered cone portion 312 at equal intervals in the circumferential direction. The honing grindstone 41 has a grindstone 42 and a grindstone base 43, which are joined together. The outer shape of the honing grindstone 41 is substantially the same as the opening shape of the slit 211.

  The grindstone platform 43 is a columnar member whose axial cross section has a quadrangular shape, and is made of, for example, a metal material such as aluminum. The side surface on the outer side in the radial direction of the grindstone base 43 extends substantially parallel to the axis C, and the grindstone 42 is integrally joined. The side surface on the axis C side of the grinding wheel head 43 is a pressure receiving surface 431 that is parallel to the tapered surface 314 of the tapered cone portion 312.

  The surface on the base end side in the axial direction of the grindstone platform 43 is a second inclined surface 432 that forms an inclination substantially parallel to the first inclined surface 212 of the slit 211. That is, the second inclined surface 432 is inclined with respect to the imaginary plane V extending in the radial direction so as to approach the axis C as it goes toward the base end side, like the first inclined surface 212. A surface 433 on the front end side in the axial direction of the grindstone platform 43 is orthogonal to the axis C.

  The grindstone 42 is, for example, a superabrasive grinding grindstone using minute diamond grits, and is a so-called electrodeposition grindstone. The outer peripheral surface of the grindstone 42 forms a grindstone surface 421 corresponding to the shape of the recess 14 (see FIG. 7) applied to the inner peripheral surface W11 of the workpiece W1.

  2, the taper surface 314 is slidably engaged with the pressure receiving surface 431 of the honing grindstone 41 by the insertion operation of the inner shaft 31 in the insertion direction A indicated by the arrow, so that the honing grindstone 41 is pushed outward in the radial direction. It protrudes from the slit 211 of the cylinder part 21, and the grindstone surface 421 presses the inner peripheral surface W11 of the workpiece W1.

  Further, the retreating operation of the inner shaft 31 in the retreat direction B indicated by the arrow urges the abutment plate 313 to abut on the distal end surface 433 of the grindstone base 43 and lift the grindstone base 43 to the base end side. Along with this, the second inclined surface 432 of the grindstone base 43 is brought into sliding contact with the first inclined surface 212 of the outer cylinder portion 21, so that the honing grindstone 41 is pulled back in the radial direction so as to be accommodated in the outer cylinder portion 21. It has become.

  Reference is again made to FIG. The honing tool 11 is detachably attached to the attachment portion 5 at the tip of the rotary spindle 1 included in the honing apparatus 101. The main shaft rotation drive unit 2 is constituted by, for example, a motor, and the honing tool 11 including both the outer cylinder portion 21 and the inner shaft 31 connected to the rotation main shaft 1 rotates around the axis C as the motor is driven. It has become. The main shaft reciprocating drive unit 3 is composed of, for example, a hydraulic cylinder, and the honing tool 11 moves along the axis C as the hydraulic cylinder is driven.

  The inner shaft reciprocating drive unit 4 is composed of, for example, a hydraulic cylinder and is connected to the inner shaft 31 of the honing tool 11. As the hydraulic cylinder is driven, the inner shaft 31 is movable in the direction of the axis C relative to the outer cylinder portion 21.

  The main shaft rotation drive unit 2, the main shaft reciprocation drive unit 3, and the inner shaft reciprocation drive unit 4 are connected to the control unit 6. The control unit 6 can simultaneously control the rotational driving and linear movement of the honing tool 11 by the main shaft rotation driving unit 2 and the main shaft reciprocating driving unit 3 and the increase / decrease timing of the pressing pressure of the grindstone 42 by the inner shaft reciprocating driving unit 4. It has become.

[Action]
Next, the dent processing by the honing apparatus 101 according to the present embodiment will be described with reference to FIG. 2 and FIGS. First, as shown in FIG. 2, the honing tool 11 of the honing apparatus 101 is inserted into the hole of the workpiece W1 to be processed. That is, the honing tool 11 is moved to the machining position in the hole by driving the spindle reciprocating drive unit 3.

  Next, as shown in FIG. 5, the inner shaft 31 is moved relative to the outer cylinder portion 21 in the direction of the arrow E <b> 1 by driving the inner shaft reciprocating drive portion 4. At this time, as described above, the pressing force of the inner shaft 31 through the sliding contact between the tapered surface 314 of the tapered cone portion 312 and the pressure receiving surface 431 indicates the pressing force in the radially outward direction as indicated by an arrow E2, and the grindstone base 43 Is transmitted to.

  Then, as shown in FIG. 6, with the grindstone surface 421 in contact with the inner peripheral surface W11 while maintaining a predetermined pressing force, the outer cylinder portion 21 is rotated and moved as indicated by the arrow E3, and the arrow E4. As shown in FIG. By repeating this rotational movement and reciprocating movement continuously, the inner peripheral surface W11 is ground over the entire circumference, and as shown in FIG. 7, the recess 14 corresponding to the shape of the grindstone surface 421 is formed on the inner peripheral surface W11. Formed.

  When the grinding is thus completed, the inner shaft 31 is moved in the withdrawal direction B indicated by the arrow E5. At the start of movement of the inner shaft 31 in the withdrawal direction B, a gap Δ is formed between the tapered surface 314 of the tapered cone portion 312 and the pressure receiving surface 431 of the grindstone platform 43. When the inner shaft 31 moves in the retreat direction B and the contact plate 313 contacts the tip surface 433 of the grindstone table 43, the second inclined surface 432 of the grindstone table 43 becomes the first inclined surface 212 of the outer cylinder portion 21. Abut. Furthermore, when the inner shaft 31 is moved in the retreat direction B, the second inclined surface 432 of the grindstone base 43 is brought into sliding contact with the first inclined surface 212 of the outer cylinder portion 21, and the honing grindstone 41 is changed to an arrow E6 in FIG. As shown, it is drawn in the radial direction.

  After being pulled in, the gap Δ between the tapered surface 314 of the tapered cone portion 312 and the pressure receiving surface 431 of the grinding wheel base 43 disappears, and the honing grindstone 41 is accommodated within the outer diameter of the outer cylinder portion 21. In a state where the honing grindstone 41 is accommodated in the outer cylinder portion 21, the honing tool 11 is moved in the withdrawal direction B and is moved out of the hole of the workpiece W1.

[effect]
The effect of the honing apparatus 101 according to the first embodiment will be described. In the first embodiment, the abutting plate 313 is provided integrally with the inner shaft 31, and the first inclined surface 212 of the outer cylinder portion 21 and the second inclined surface 432 of the grindstone platform 43 are radially orthogonal to the axis C. It is made to incline with respect to the virtual plane V extended in the direction. Thereby, the honing grindstone 41 is automatically accommodated in the slit 211 of the outer cylinder part 21 as the inner shaft 31 is moved in the withdrawal direction B. The honing tool 11 can be smoothly pulled out from the hole of the workpiece W1 without the grindstone 42 protruding outward in the radial direction during processing being caught by the axial end portion of the recess 14.

  Furthermore, there is no need to use a biasing member such as a spring for returning the honing grindstone 41 in the radial direction, and the configuration of the honing tool 11 can be simplified. In addition, compared with turning with a cutting tool, the cost can be reduced by reducing the cost of the cutting tool, and the recessing can be efficiently performed by shortening the cycle time.

  In the above description, the dent processing is described as an example. However, for example, in the case of hole finishing processing, the honing tool 11 is used by adjusting the protrusion amount of the grindstone 42 and the pressing pressure against the inner peripheral surface W11. It can be processed into any hole diameter.

Second Embodiment
Next, an electrolytic processing apparatus 102 as a processing apparatus according to the second embodiment of the present invention will be described with reference to FIGS. 9 and 10. In addition, the same code | symbol is attached | subjected about the structure substantially the same as 1st Embodiment, and description is abbreviate | omitted. The electrolytic processing apparatus 102 according to the second embodiment performs dent processing on the inner peripheral surface W11 of the hole of the workpiece W1 by electrolytic processing.

  The configuration of the inner shaft 31 of the electrolytic processing apparatus 102 is the same as that of the first embodiment. The electrolytic processing apparatus 102 includes an electrolytic processing tool 12 as a processing tool, and includes an electrode 51 instead of the honing grindstone 41. As shown in FIG. 10, eight electrodes 51 are provided at equal intervals on the outer periphery of the inner shaft 31.

  When the inner shaft 31 moves relative to the outer cylinder portion 22 in the insertion direction A, the pressure receiving surface 513 of the electrode 51 and the tapered surface 314 of the tapered cone portion 312 are in sliding contact. The outer cylindrical portion 22 is formed with eight slits 221 having a rectangular shape in a side view so as to hold the electrode 51 so as to protrude and retract in the radial direction at equal intervals in the circumferential direction. The configurations and operations of the first inclined surface 222 and the second inclined surface 511 are the same as those in the first embodiment.

  Also in the second embodiment, when the inner shaft 31 is moved in the insertion direction A, the electrode 51 expands in the radially outward direction, and when the inner shaft 31 is moved in the withdrawal direction B, the electrode 51 is automatically adjusted in diameter. It is pulled back inward.

  The hole of the workpiece W1 is filled with the electrolytic solution S, and at the time of processing, the electrode 51 is connected to a cathode (not shown), and the workpiece W1 is connected to an anode (not shown). At the time of electrolytic processing, with the processing tool rotated as indicated by arrow E7, the electrode 51 is charged to the cathode, the workpiece W1 is charged to the anode, and between the electrode 51 and the inner peripheral surface W11 via the electrolytic solution. The inner circumferential surface W11 of the workpiece W1 is recessed by the current generated in

  According to the present embodiment, the amount of insertion of the inner shaft 31 is adjusted, and the distance between the electrode 51 and the workpiece W1 is kept constant, so that the electrolytic machining accuracy can be improved.

<Third Embodiment>
Next, a honing apparatus 103 according to a third embodiment of the present invention will be described with reference to FIG. In the honing apparatus 103 according to the third embodiment, a plurality of (two in this embodiment) annular recesses 14 are machined on the inner circumferential surface W31 of the workpiece W3. In addition, the same code | symbol is attached | subjected about the structure substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  The inner shaft 33 of the honing tool 13 includes a first main body portion 331, a first tapered cone portion 332, a second main body portion 333, a second tapered cone portion 334, and an abutting plate 313, and a proximal end in the axial direction. To the tip side. That is, in this embodiment, two tapered cone portions 332 and 334 are provided apart from each other in the axial direction.

  Three honing grindstones 41 are provided on the outer circumferences of the tapered cone portions 332 and 334 at equal intervals in the circumferential direction. A slit 231 is formed in the outer cylinder portion 23 at a position corresponding to each honing grindstone 41. That is, a total of six slits 231 are formed, three in a radial manner at the same position in the axial direction, and three in a radial manner at positions spaced apart from the three slits 231 in the axial direction.

According to this embodiment, the end surface 335 of the second main body portion 333 on the side of the withdrawal direction B comes into contact with the tip surface 433 of the grindstone platform 43 by the withdrawal operation of the inner shaft 33 in the withdrawal direction B. That is, the end of the second body portion 333 on the withdrawal direction B side has the same function as the contact plate 313.
In the present embodiment, the same effects as those of the first embodiment can be obtained in the multi-step dent processing.

<Other embodiments>
For example, as shown in FIG. 12, the processing apparatuses 101, 102, and 103 in each of the above embodiments can also be applied to the case where a recess is formed on a work W4 having a tapered inner peripheral surface W41. . In FIG. 12, the process using the honing apparatus 101 of 1st Embodiment is shown. The diameter D1 at the entrance of the hole is smaller than the diameter D2 at the bottom of the hole and is narrower. If the diameter D1 of the entrance is larger than the outer diameter of the outer cylinder portion 21 and the grindstone 42 can be pressed against the inner peripheral surface W41, the recess 16 can be processed by the same operation as in the above embodiment. In the case of machining using the electrolytic machining apparatus 102 of the second embodiment, machining is performed with the electrode 51 and the inner peripheral surface W11 being separated from each other.

  In the first embodiment, as shown in FIG. 13, the tip surface of the grindstone base 53 may be formed on the inclined surface 531 and the base end surface of the contact plate 316 may be formed on the inclined surface 317. The inclined surfaces 531 and 317 are inclined so as to approach the axis C toward the tip side. In this case, the front end surface 242 of the slit 241 of the outer cylinder part 24 is also formed as a corresponding inclined surface. According to this configuration, it is possible to easily move the grindstone platform 53 more reliably in the withdrawal direction.

  In addition, the contact plate 313 is only required to be in contact with the grindstone base 43 or the electrode 51 and urge the grindstone base 43 or the electrode 51 in a direction oblique to the axis C side from the withdrawal direction or the withdrawal direction. Not only the circular cross section but also various changes can be made. For example, a blade shape having the number of blades contacting the one grindstone table 43 as many as the number of the grindstone tables 43 may be used. Moreover, the flat surface 315 may not be provided, and the wheel head 43 and the electrode 51 may be contacted by point contact or line contact.

  You may form the discharge groove | channel for discharging | emitting grinding waste in the grindstone surface 421 of the said 1st Embodiment and 3rd Embodiment. For example, as shown in FIGS. 14 (a) and 14 (b), grooves 61 and 62 that are inclined with respect to the axial direction, as shown in FIG. 14 (c), a cross-shaped groove 63, and FIG. 14 (d). ), The grooves 64 and the like parallel to the axial direction can be formed. Note that the vertical direction in FIG. 14 coincides with the axial direction.

  In the said embodiment, although the processing apparatus of this invention was applied to the honing processing apparatuses 101 and 103 and the electrolytic processing apparatus 102, it can be applied to other processing apparatuses. For example, a brush is provided in place of the grindstone 42, a deburring device or a polishing device for the recess, a drill shape is provided in the contact plate 313, a device for performing drilling simultaneously, and a cutting tool such as a chip is provided in place of the grindstone 42 It can be applied to an apparatus for processing.

  In each of the above embodiments, the process of forming the annular recess 14 is performed. However, the shape of the recess 14 is not limited thereto, and various shapes can be obtained by changing the shape of the grindstone surface 421 or the electrode 51. It is. Further, the shapes of the slits 211, 221, and 231 can be changed in accordance with the shapes of the grindstone 41 and the electrode 51. For example, the shape of the side view may be an elongated elliptical shape. Further, the number of the grindstones 42 and the electrodes 51 is not limited to three or eight, and one or other plural number may be provided.

  The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

11 ... Honing tool (machining tool)
21 ... outer cylinder part 211 ... slit (communication part)
212 ... 1st inclined surface 31 ... Inner shaft 312 ... Tapered cone part 313 ... Contact plate (contact part)
41 ・ ・ ・ Honing wheel (working part)
432 ... 2nd inclined surface 101 ... Honing processing device C ... Central axis (axis)
W1 ... Workpiece (workpiece)
W11 ... inner peripheral surface

Claims (4)

A processing tool mounted on the honing apparatus (101, 103) and performing honing on the inner peripheral surface (W11, W31) of the hole of the workpiece (W1, W3),
An outer cylindrical portion (21, 22, 23) having a hollow cylindrical shape and having communication portions (211, 221, 231) for communicating the inner space and the outer space in the radial direction;
Inner shafts (31, 33) inserted inside the outer cylinder portion so as to be movable relative to the outer cylinder portion in the direction of the axis (C) of the outer cylinder portion and integrally rotatable;
An outer periphery of the inner shaft is disposed to face the inner peripheral surface, has a grindstone surface (421), and discharge grooves (61, 62, 63, 64) formed on the grindstone surface, and the inner peripheral surface is Processing parts (41, 51) to be processed;
Provided on the inner shaft and tapered in the insertion direction (A) of the inner shaft, and when the inner shaft slides in the insertion direction with respect to the outer tube portion, the processed portion becomes the communication portion. A tapered cone portion (312, 332, 334) that is inserted and pushed out in a radially outward direction of the outer cylinder portion and that contacts the processed portion at a tapered surface (314);
Provided integrally with the inner shaft on the insertion direction side of the taper cone portion, and when the inner shaft slides in the withdrawal direction (B) opposite to the insertion direction, the processed portion is attached in the withdrawal direction. An abutting portion (313) that abuts on an end surface (433, 512) on the insertion direction side of the processing portion;
A first inclined surface that is inclined with respect to a virtual plane (V) perpendicular to the axis so that the end surface of the communicating portion on the withdrawal direction side of the outer cylinder portion approaches the axis as it goes toward the withdrawal direction. Formed as inclined surfaces (212, 222),
The end surface facing the first inclined surface in the processed portion is slidably contacted with the first inclined surface when the inner shaft is slid in the retracted direction, and is movable in the radially inward direction of the outer cylindrical portion, It is formed as a second inclined surface (432, 511) that is inclined with respect to the virtual plane so as to approach the axis line toward the exit direction ,
A plurality of the processing parts are arranged radially on the outer periphery of the inner shaft,
The abutment, processing tool in one of the working portion that a contact with wing-like site have Bun'yu number of the processing unit.   The processing tool according to claim 1, wherein the contact portion is a plate-like member having a plane (315) orthogonal to the axis. The processing tool according to claim 1 or 2 , wherein the discharge groove (61, 62) is inclined with respect to the axial direction. The processing tool according to any one of claims 1 to 3 ,
A rotating spindle (1) provided at the tip with the processing tool;
A main shaft rotation drive unit (2) for driving the rotation main shaft to rotate about the axis of the inner peripheral surface;
A main shaft reciprocating drive unit (3) for reciprocating the rotating main shaft in the axial direction of the inner peripheral surface;
An inner shaft reciprocating drive section (4) for reciprocating the inner shaft relative to the outer cylinder section in the axial direction of the outer cylinder section;
A control unit (5) for controlling the spindle rotation driving unit, the spindle reciprocating driving unit, and the inner shaft reciprocating driving unit;
A processing apparatus comprising:

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