Cutting Machine

Abstract

A cutting machine (10) is provided with, at a distal end of a tool (24), a key protrusion (82) that has a tapered section (86). The distal end of the tool (24) can be inserted into an insertion hole (136) of a bushing (114). The insertion hole (136) is provided with a key groove (138) into which the key protrusion (82) is inserted. The tapered section (86) of the key protrusion (82) has first and second inclined surfaces (90, 92). The first inclined surface (90) is a surface twisted clockwise with respect to the axial center of the tool (24). The second inclined surface (92) is a surface twisted counterclockwise with respect to the axial center of the tool (24). A tapered groove section (140) of the key groove (138) has first and second guide surfaces (144, 146).

Description

[Technical field]

[0001] The present invention relates to a cutting machine that uses cutting tools to machine a workpiece. [Background technology]

[0002] The present applicant has proposed a cutting machine used for boring or honing (see Japanese Patent Publication No. 5-2442). This cutting machine processes bearing holes in a cylinder block, which is a workpiece.

[0003] The cutting machine includes a support, a drive mechanism, a feed mechanism, four tool heads, a tool (boring bar), four support jigs, a workpiece support mechanism, and a transport mechanism.

[0004] The support pillar is erected on a base. A processing station is installed on the base. A drive mechanism is arranged so as to be able to rise and fall at a position corresponding to the processing station. The drive mechanism and the tool head are raised and lowered along the support pillar by a feed mechanism. Tools are detachably connected to each tool head. The tools extend downward from the tool head. A support jig is arranged at a position corresponding to the processing station. The support jig is fixed to the lower part of the support pillar.

[0005] In this cutting machine, the workpiece is transported by the transport mechanism to a position corresponding to the machining station and held by a support jig. The motor of the feed mechanism is driven to lower the drive mechanism, tool head, and tool along the support. As the tool descends, the lower end of the tool is inserted into an insertion hole provided in a bush (bearing) of the rotation support unit. The tool is inserted into the bearing hole of the workpiece while rotating as the drive mechanism is driven. The bearing hole of the workpiece is machined by the cutting edge of the tool. After machining of the bearing hole of the workpiece is completed, the feed mechanism is driven to raise the tool. After the support jig releases the workpiece from its hold on the workpiece, the transport mechanism transports the workpiece out of the machining station.

[0006] In the above-mentioned cutting machine, if the phase of the rotation direction when the outer periphery of the lower end of the tool and the inner periphery of the bush engage varies, or if slippage occurs between the engaged gaps and relative rotation occurs, the rotation accuracy of the tool deteriorates within the tolerance range of each cylindricity. As a means for matching the phase of the rotation direction when the outer periphery of the lower end of the tool and the inner periphery of the bush engage, it is considered to provide a key groove on the bush and a movable key on the lower end of the tool. A commonly used method is that the movable key retreats when the tool descends and engages with the bush, and then when the tool is rotated and the phase of the movable key of the tool and the key groove of the bush match, the movable key protrudes to engage the movable key with the key groove. This makes it possible to match the phase of the rotation direction between the lower end of the tool and the bush.

[0007] However, when a movable key is provided at the bottom end of a tool, there is a concern that chips generated by the cutting machine may get into the moving part of the movable key, causing the movable key to not function properly.When the tip of a tool equipped with a non-movable movable key is inserted into the inside of a bush with a key groove that is out of phase with the key groove, a problem occurs in that the movable key and the bush interfere with each other.

[0008] The present invention aims to solve the above-mentioned problems.

[0009] An aspect of the present invention is a device comprising: a main body frame; a shaft-shaped tool that is linearly movable along the main body frame and is rotationally driven; a rotary support unit having a rotary body with an insertion hole into which a tip portion of the tool along a moving direction of the tool is inserted, the rotary body being rotatable together with the tool inserted into the insertion hole, the tool is inserted into the insertion hole by moving in a first direction along an axial direction of the tool; A tip end of the tool is provided with an engagement protrusion protruding radially outwardly of the tool and extending along the axial direction of the tool, the insertion hole includes an engagement groove extending along an axial direction of the rotor and recessed from an inner circumferential surface of the insertion hole radially outwardly of the insertion hole into which the engagement protrusion is inserted; The engaging protrusion is a protrusion main body formed with a substantially constant width along the axial direction of the tool; a tapered portion having first and second inclined surfaces disposed adjacent to each other in the first direction of the protrusion main body, the first and second inclined surfaces being spaced apart from each other by a distance that decreases toward the first direction; Equipped with When the tool is viewed in the first direction, the first inclined surface is disposed in a counterclockwise direction with respect to a center of the width direction of the tapered portion, and the second inclined surface is disposed in a clockwise direction with respect to the center of the width direction of the tapered portion, the first inclined surface is a surface twisted clockwise with respect to an axial center of the tool toward the first direction, and the second inclined surface is a surface twisted counterclockwise with respect to an axial center of the tool toward the first direction, the rotor has an end surface facing a second direction that is opposite to the first direction, The engagement groove is a tapered groove portion having first and second guide surfaces extending in the first direction from the end surface of the rotor and having a width greater than that of the tapered portion, the first and second guide surfaces being spaced apart from each other by a distance that decreases in the first direction; a groove body that is disposed adjacent to the tapered groove portion in the first direction and is formed with a substantially constant width along the axial direction of the rotor; Equipped with When the insertion hole is viewed in the first direction, the first guide surface is disposed in a counterclockwise direction with respect to a center of the width direction of the engagement groove, and the second guide surface is disposed in a clockwise direction with respect to the center of the width direction of the engagement groove, The first guide surface is a surface twisted clockwise around the axial center of the insertion hole toward the first direction, and the second guide surface is a surface twisted counterclockwise around the axial center of the insertion hole toward the first direction.

[0010] According to the present invention, the following effects can be obtained.

[0011] That is, the tool is moved in a first direction along the main body frame, and the engagement protrusion provided at the tip of the tool is inserted into the engagement groove of the insertion hole in the rotor. At this time, the first inclined surface is a surface twisted clockwise about the axial center of the tool toward the first direction, and the second inclined surface is a surface twisted counterclockwise about the axial center of the tool toward the first direction. The first guide surface is a surface twisted clockwise about the axial center of the insertion hole toward the first direction, and the second guide surface is a surface twisted counterclockwise about the axial center of the insertion hole toward the first direction.

[0012] Therefore, when the engagement protrusion is inserted into the engagement groove with the engagement protrusion and the engagement groove shifted clockwise or counterclockwise, either the first inclined surface and the first guide surface, or the second inclined surface and the second guide surface can come into surface contact with each other with their twisted curved surfaces to the degree of phase shift in the rotational direction.

[0013] Therefore, when the tool moves in the first direction with the first inclined surface and the first guide surface in surface contact, or with the second inclined surface and the second guide surface in surface contact, the rotating body rotates following the tool so that the widthwise center of the engagement groove faces the widthwise center of the engagement protrusion. The widthwise center of the engagement groove and the widthwise center of the engagement protrusion coincide with each other, and the protrusion main body of the engagement protrusion is inserted into the groove main body of the engagement groove.

[0014] As a result, by lowering the tool and inserting the engagement protrusion into the engagement groove of the rotating body, either the first inclined surface and the first guide surface or the second inclined surface and the second guide surface come into surface contact, and it is easy to quickly and smoothly align the phase of the rotation direction between the tool and the rotating body. This allows the phase of the tool and the bush to be aligned simultaneously with the insertion of the tool, thereby shortening the work time when the tool is rotated to process the workpiece. Since the engagement protrusion is fixed to the tip of the tool, there is no malfunction caused by chips generated by the cutting machine, and the tool can always be stably inserted into the engagement groove to align the phase of the rotation direction between the tool and the rotating body. Furthermore, regardless of the amount of phase shift of the bush, either the first inclined surface and the first guide surface or the second inclined surface and the second guide surface always come into surface contact, allowing stable use without abnormal wear. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an external perspective view of a cutting machine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged perspective view of a main portion of the cutting machine of FIG. [Diagram 3] 3 is an enlarged perspective view showing the vicinity of the tip of the tool and the first rotation support unit in the cutting machine of FIG. 1. FIG. [Figure 4] FIG. 4 is an enlarged front view showing the tip of the tool and the adapter. [Diagram 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] 6A is a cross-sectional view taken along line VIA-VIA in FIG. 4, FIG. 6B is a cross-sectional view taken along line VIB-VIB in FIG. 4, and FIG. 6C is a cross-sectional view taken along line VIC-VIC in FIG. [Figure 7] 7 is a top view of the first rotation support unit shown in FIG. 2. FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9]9A is a cross-sectional view taken along line IXA-IXA in FIG. 8, FIG. 9B is a cross-sectional view taken along line IXB-IXB in FIG. 8, and FIG. 9C is a cross-sectional view taken along line IXC-IXC in FIG. [Figure 10] FIG. 10 is a conceptual diagram showing a state in which the tip of the tool is inserted into the key groove of the first rotation support unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The cutting machine 10 is used to perform hole drilling on a workpiece W. The workpiece W is a cylinder block and a cylinder head of an internal combustion engine mounted on a vehicle. As shown in Figs. 1 and 2, the cutting machine 10 includes a base 12, a main body frame 14, a processing station 16, a drive mechanism 18, a feed mechanism 20, four tool heads 22, a tool 24, a jig 26, a support block 28, and a transport mechanism 30.

[0017] The base 12 is disposed at the bottom of the cutting machine 10. The base 12 extends horizontally. The base 12 is placed on a floor surface or the like. The base 12 includes a first base 32 and a second base 34. The main body frame 14 is connected to an upper portion of the first base 32. The second base 34 is adjacent to the first base 32. A transport mechanism 30, which will be described later, is disposed at an upper portion of the second base 34.

[0018] The main body frame 14 stands upward from an upper portion of the first base 32 of the base 12. The main body frame 14 includes an accommodation space 36 and a guide rail 38.

[0019] The accommodation space 36 opens to the outer peripheral surface of the main body frame 14. The accommodation space 36 faces the processing station 16 and the transport mechanism 30, which will be described later. A support block 28, which will be described later, is accommodated inside the accommodation space 36.

[0020] The guide rails 38 are disposed on the outer circumferential surface of the main body frame 14. The guide rails 38 are disposed in the upper portion of the accommodation space 36. The guide rails 38 extend along the axial direction of the main body frame 14.

[0021] The processing station 16 is a location where the workpiece W is processed. The processing station 16 is disposed on the side of the main body frame 14. The processing station 16 faces the lower part of the main body frame 14. The workpiece W is carried in and out of the processing station 16 by a transport mechanism 30.

[0022] The drive mechanism 18 is disposed on the upper part of the main body frame 14. A part of the drive mechanism 18 protrudes radially outward from the main body frame 14. The drive mechanism 18 is disposed above the processing station 16. The drive mechanism 18 and the processing station 16 face each other in the vertical direction. The drive mechanism 18 includes a lift table 40 and a drive motor 42.

[0023] The lifting platform 40 is disposed horizontally and perpendicular to the axis of the main body frame 14. The lifting platform 40 is movable along the guide rails 38 of the main body frame 14. The drive motor 42 is fixed to the upper part of the lifting platform 40. The drive motor 42 has a drive shaft (not shown). A rotating shaft 48 of the tool head 22 is connected to the lower end of the drive shaft. When electricity is applied to the drive motor 42 from a power source (not shown), the rotating shaft 48 rotates together with the drive shaft.

[0024] The feed mechanism 20 is capable of moving the drive mechanism 18, which includes the lift platform 40, in the vertical direction. The feed mechanism 20 is disposed on the upper part of the main body frame 14. The feed mechanism 20 includes a lift motor 44. By driving the lift motor 44, the lift platform 40 moves in the vertical direction along the guide rail 38.

[0025] The four tool heads 22 are arranged on the outer periphery of the main body frame 14. The four tool heads 22 are held by a head carrier 46. The head carrier 46 is annular. The head carrier 46 is arranged radially outward from the outer periphery of the main body frame 14. The head carrier 46 is rotatably arranged on the main body frame 14. The four tool heads 22 are arranged at equal intervals in the circumferential direction of the head carrier 46. When viewed in the axial direction of the head carrier 46, the four tool heads 22 are spaced apart from one another by 90°.

[0026] When the head carrier 46 rotates due to the driving force of a driving source (not shown), the four tool heads 22 rotate around the main body frame 14. The four tool heads 22 rotate along the outer circumferential surface of the main body frame 14, and one of the four tool heads 22 is disposed at a position facing the processing station 16.

[0027] Each tool head 22 includes a rotating shaft 48. The rotating shaft 48 is rotatably supported by the tool head 22. The rotating shaft 48 extends downward (in a first direction) from the tool head 22. An upper end of the rotating shaft 48 is connected to a lower end of a drive shaft of the drive motor 42 in the drive mechanism 18. A lower end of the rotating shaft 48 is coupled to an upper end of the tool 24 via a joint (not shown).

[0028] The tool 24 is detachably disposed on the tool head 22. The tool 24 has a long shaft shape along the axial direction. The tool 24 extends downward (in the second direction) from the tool head 22. The tool 24 includes a tool shaft 25, a plurality of cutting tools 50, and an adapter 52.

[0029] The cutting tool 50 is a cutting tool having a cutting portion at its tip. The cutting tool 50 is arranged in a direction perpendicular to the axis of the tool shaft 25. The cutting tool 50 is inserted into a retaining hole (not shown) provided in the tool shaft 25. The tip of the cutting tool 50 protrudes radially outward from the outer circumferential surface of the tool 24 (tool shaft 25). The multiple cutting tools 50 are arranged at equal intervals along the axial direction of the tool 24. The inner circumferential surface of a pilot hole H (see FIG. 2) in the workpiece W is cut by the tip of the cutting tool 50.

[0030] An upper end of the tool 24 (tool shaft 25) can be connected to a lower end of the rotating shaft 48. When the drive motor 42 rotates, the tool 24 rotates together with the rotating shaft 48. The lower end of the tool 24 can be inserted into a first rotation support unit 106 of the jig 26, which will be described later.

[0031] As shown in FIGS. 3 to 5, the lower end (tip) of the tool shaft 25 has a mounting hole 54. The mounting hole 54 opens downward. The insertion portion 74 of the adapter 52 is inserted into the mounting hole 54. The tool shaft 25 has a screw hole 56 at the upper end of the mounting hole 54. The screw hole 56 is disposed at the center of the mounting hole 54. The screw hole 56 extends upward (in the second direction) beyond the upper end of the mounting hole 54. When viewed from the axial direction of the tool 24, the inner peripheral surface of the mounting hole 54 is circular. The inner peripheral surface of the mounting hole 54 has a pair of slit grooves 58. The slit grooves 58 are recessed radially outward from the inner peripheral surface of the mounting hole 54. The slit grooves 58 extend along the axial direction of the mounting hole 54.

[0032] The adapter 52 is connected to the lower end of the tool shaft 25. The adapter 52 is detachably disposed on the tool shaft 25. The adapter 52 includes a body 60, a key member 62, a plug member 64, a nut member 66, a pair of anti-rotation members 68, and a connecting bolt 70. When the tool 24 is lowered, the adapter 52 can be inserted into the first rotation support unit 106 together with the tool 24.

[0033] The body 60 is cylindrical. The outer diameter of the body 60 is approximately the same as the outer diameter of the tool 24. The body 60 includes an accommodating hole 72 and an insertion portion 74. The accommodating hole 72 is disposed approximately in the center of the body 60 along the axial direction.

[0034] The accommodating hole 72 penetrates the body 60 in a direction perpendicular to the axial direction. The accommodating hole 72 is capable of accommodating the key member 62. When viewed from a direction perpendicular to the axial direction of the body 60, the cross-sectional shape of the accommodating hole 72 is a rectangle that is elongated in the axial direction. The accommodating hole 72 opens to the outer circumferential surface of the body 60.

[0035] The insertion portion 74 is disposed at the upper end of the body 60. The insertion portion 74 has a smaller diameter than the body 60. The insertion portion 74 can be inserted into the mounting hole 54 of the tool 24. A pair of anti-rotation members 68 are attached to the insertion portion 74. The anti-rotation members 68 are attached to the insertion portion 74 so that they protrude radially outward from the outer circumferential surface of the insertion portion 74.

[0036] The anti-rotation members 68 extend along the axial direction of the insertion portion 74. When the insertion portion 74 is inserted into the mounting hole 54, the pair of anti-rotation members 68 are inserted into the slit grooves 58, respectively. This prevents the tool 24 and the adapter 52 from rotating relative to the tool 24.

[0037] The body 60 has a bolt hole 76 and a set screw hole 78 inside. The bolt hole 76 and the set screw hole 78 are each disposed on the axis of the body 60.

[0038] The connecting bolt 70 can be inserted into the bolt hole 76. The bolt hole 76 is disposed at a position closer to the insertion portion 74 than the accommodating hole 72. The bolt hole 76 opens into and communicates with the accommodating hole 72. The bolt hole 76 extends from the body 60 to the insertion portion 74. The bolt hole 76 opens at the upper end of the insertion portion 74. When the insertion portion 74 is inserted into the mounting hole 54 of the tool 24, the connecting bolt 70 inserted into the bolt hole 76 is screwed into the screw hole 56. As a result, the adapter 52 is fixed to the lower end of the tool 24 by the connecting bolt 70.

[0039] The set screw hole 78 penetrates from the lower end of the body 60 to the accommodating hole 72. A plug member 64 and a nut member 66 are accommodated in the set screw hole 78. The plug member 64 is disposed in the set screw hole 78 at a position adjacent to the accommodating hole 72. The nut member 66 is disposed in the set screw hole 78 at a position adjacent to the lower end of the body 60, spaced from the accommodating hole 72.

[0040] With the plug member 64 inserted into the set screw hole 78, the nut member 66 is screwed into the set screw hole 78 from the lower end of the body 60. This causes the set screw hole 78 to be blocked by the nut member 66. In the set screw hole 78, an upper portion of the plug member 64 protrudes into the receiving hole 72. The upper portion of the plug member 64 engages with a recess 84 of the key member 62, which will be described later, thereby enabling the radial position of the key member 62 to be determined.

[0041] The key member 62 is a block body. The key member 62 includes a key body 80 and a key protrusion (engagement protrusion) 82. The cross-sectional shape of the key body 80 is substantially rectangular. The key body 80 has a shape corresponding to the receiving hole 72 of the body 60. The lower end of the key body 80 includes a recess 84. When the key member 62 is viewed from below, the cross-sectional shape of the recess 84 is a shape in which a part of a circle is cut out (see Figs. 6A to 6C). The cross-sectional shape of the recess 84 corresponds to the plug member 64. When the key member 62 is inserted into the receiving hole 72, the recess 84 faces the set screw hole 78. An upper part of the plug member 64 is inserted into the recess 84. The plug member 64 is inserted into the recess 84 to restrict the movement of the key member 62 along the receiving hole 72. The key member 62 is fixed to the receiving hole 72 by the plug member 64.

[0042] With this configuration, when the key protrusion 82 is inserted into the key groove 138 as described below, the load applied to the key protrusion 82 is applied to the body 60 and not to the connecting bolt 70.

[0043] The key body 80 has a side portion perpendicular to the lower end of the key body 80. A key protrusion 82 is disposed on the side portion of the key body 80. When the key member 62 is inserted into the receiving hole 72, the key protrusion 82 protrudes radially outward from the outer circumferential surface of the body 60. The key protrusion 82 is exposed to the outside of the body 60.

[0044] The key protrusion 82 extends along the axial direction of the key member 62. The key protrusion 82 is elongated along the axial direction of the key member 62. The extending direction of the key protrusion 82 is the same as the axial direction of the body 60. The key protrusion 82 includes a tapered portion 86 and a protrusion main body 88.

[0045] The tapered portion 86 extends from approximately the center to the lower end of the key convex portion 82 along the extension direction of the key convex portion 82. The width dimension of the tapered portion 86 gradually decreases toward the lower end of the key convex portion 82. The width dimension is the dimension in the width direction perpendicular to the axial direction of the key convex portion 82.

[0046] The tapered portion 86 has a pair of first and second inclined surfaces 90, 92. The first and second inclined surfaces 90, 92 are arranged on both sides of the width direction of the key protrusion 82 perpendicular to the extension direction of the key protrusion 82.

[0047] The first inclined surface 90 is disposed on one side in the width direction of the key protrusion 82. The second inclined surface 92 is disposed on the other side in the width direction of the key protrusion 82. The first inclined surface 90 and the second inclined surface 92 are symmetrical with respect to a straight line AA passing through the width direction center of the key protrusion 82 and the axial center P of the tool 24 (the rotation center of the tool 24). In the width direction of the key protrusion 82, the distance between the first inclined surface 90 and the second inclined surface 92 gradually decreases in the direction away from the protrusion main body 88 (downward, first direction).

[0048] The first and second inclined surfaces 90, 92 are spirally twisted along the circumferential direction of the body 60. When the tool 24 (adapter 52) is viewed downward from the upper end of the tapered portion 86 shown in Figures 6A to 6C, the first inclined surface 90 is disposed in a counterclockwise direction (arrow B direction) with respect to the straight line AA. The first inclined surface 90 is a curved surface twisted clockwise with respect to the axial center of the tool 24 downward from the upper end of the tapered portion 86.

[0049] 6A to 6C, when the tool 24 (adapter 52) is viewed downward from the upper end of the tapered portion 86, the second inclined surface 92 is disposed in a clockwise direction (direction of arrow C) with respect to the straight line AA. The second inclined surface 92 is a curved surface twisted counterclockwise about the axial center of the tool 24 (adapter 52) from the upper end of the tapered portion 86 downward.

[0050] 6A to 6C, when viewed from above, the angle between the straight line AA and the first inclined surface 90 is defined as an inclination angle θ1, and the inclination angle θ1 of the first inclined surface 90 gradually increases from the upper end to the lower end of the key protrusion 82. As shown in Fig. 6A, at the upper end of the key protrusion 82, the first inclined surface 90 is parallel to the straight line AA.

[0051] When the tool 24 (adapter 52) is viewed downward from the upper end of the tapered portion 86 shown in Figures 6A to 6C, the second inclined surface 92 is a curved surface twisted counterclockwise about the axial center of the tool 24. When the key member 62 is viewed from above, the angle between the line AA and the second inclined surface 92 is taken as an inclination angle θ2, and the inclination angle θ2 of the second inclined surface 92 gradually increases from the upper end to the lower end of the key protrusion 82. As shown in Figure 6A, at the upper end of the key protrusion 82, the second inclined surface 92 is parallel to the line AA.

[0052] In the tapered portion 86, the twisting direction of the first inclined surface 90 is opposite to the twisting direction of the second inclined surface 92. The inclination angle θ1 and the inclination angle θ2 are the same in the extending direction of the key convex portion 82.

[0053] When viewed from above in the axial direction of the tool 24, the cross-sectional shape of the upper end of the key protrusion 82 is rectangular. The cross-sectional shape of the lower end of the key protrusion 82 is trapezoidal with a narrower width on the radially outward side. From the upper end to the lower end of the key protrusion 82, the cross-sectional shape of the key protrusion 82 gradually changes from rectangular to trapezoidal.

[0054] As shown in Figs. 3 to 5, the convex portion main body 88 is disposed on the upper part of the tapered portion 86. The convex portion main body 88 extends from approximately the center of the key convex portion 82 along the extension direction of the key convex portion 82 to the upper end. The width dimension of the convex portion main body 88 is approximately constant along the extension direction of the key convex portion 82. The convex portion main body 88 is symmetrical in the width direction of the convex portion main body 88. When viewed from above in the axial direction of the tool 24, the cross-sectional shape of the convex portion main body 88 is rectangular.

[0055] As shown in Figs. 1 and 2, the four jigs 26 are capable of holding a workpiece W. The jigs 26 are held by support carriers 94. The jigs 26 are disposed at the same height as the support blocks 28 in the axial direction of the main body frame 14 by a pair of support carriers 94. The support carriers 94 are annular. The support carriers 94 are rotatably disposed on the outer periphery of the main body frame 14. The four jigs 26 are held by the support carriers 94 at equal intervals in the circumferential direction of the support carrier 94. When viewed in the axial direction of the support carrier 94, the four jigs 26 are spaced apart from one another by 90°.

[0056] The four jigs 26 are capable of rotating around the outer periphery of the main body frame 14 by the support carrier 94. When one of the four jigs 26 faces the processing station 16, the one jig 26 faces the support block 28.

[0057] 1 to 3, the jig 26 includes a jig body 96 and first and second support parts 98, 100. The cross-sectional shape of the jig 26 is a U-shape in which the first and second support parts 98, 100 and the jig body 96 are substantially perpendicular to each other. The workpiece W is held so as to be surrounded by the jig body 96 and the first and second support parts 98, 100 (see FIGS. 1 and 2).

[0058] The jig body 96 is in the form of a flat plate. The jig body 96 faces the main body frame 14 or the support block 28. The jig body 96 is in the form of a substantially rectangular shape that is straight in the vertical direction.

[0059] The back surface of the jig body 96 faces the main body frame 14. A reference base 102 is attached to the back surface of the jig body 96. A connection portion 150 of a support block 28, which will be described later, abuts against the reference base 102.

[0060] The first support portion 98 is disposed at the lower end of the jig body 96. The second support portion 100 is disposed at the upper end of the jig body 96. The first and second support portions 98, 100 each protrude in a direction perpendicular to the extension direction of the jig body 96. The first and second support portions 98, 100 each extend in the opposite direction to the main body frame 14. The first support portion 98 and the second support portion 100 face each other in the vertical direction.

[0061] The first support part 98 has a first support hole 104. The first support hole 104 penetrates in the up-down direction. A first rotation support unit 106 is housed in the first support hole 104. When the tool 24 is lowered together with the tool head 22, a second rotation support unit 110 that supports the tool 24 is inserted into the second support hole 108. The second rotation support unit 110 is held by the second support hole 108 of the second support part 100.

[0062] 7 and 8, the first rotation support unit 106 includes a housing 112, a bush (rotating body) 114, a pair of bearings 1161, 1162, a holder 118, first and second caps 120, 122, and a detection mechanism 124. The housing 112 is cylindrical. The housing 112 is inserted into and held in the first support hole 104 of the first support portion 98. The axis of the housing 112 extends in the vertical direction. The holder 118 is connected to the lower end of the housing 112.

[0063] The bush 114 is a cylindrical body. The bush 114 is accommodated inside the housing 112 and the holder 118. The bush 114 is arranged coaxially with the housing 112. A pair of bearings 1161, 1162 is arranged between the bush 114 and the housing 112. The pair of bearings 1161, 1162 are spaced apart in the axial direction of the bush 114 and the housing 112. The pair of bearings 1161, 1162 support the bush 114 rotatably in the housing 112.

[0064] A first cap 120 is attached to the upper ends of the housing 112 and the bush 114. The upper end of the bush 114 passes through the first cap 120. The upper end of the bush 114 is exposed to the outside. A second cap 122 is attached to the lower end of the housing 112 via a holder 118. The second cap 122 covers the lower end of the bush 114. The first and second caps 120, 122 are rotatable together with the bush 114.

[0065] The detection mechanism 124 includes a detected part 126, an air supply member 128, and a detection sensor 130 (see FIG. 2). The detected part 126 is disposed on the outer circumferential surface of the bush 114. The detected part 126 is disposed near the lower end of the bush 114. The detected part 126 protrudes radially outward from the outer circumferential surface of the bush 114. The detected part 126 has a predetermined width in the rotational direction of the bush 114.

[0066] The air supply member 128 is attached to the holder 118. The air supply member 128 is attached so as to face radially inward from the outer circumferential surface of the holder 118. Compressed air is supplied to the air supply member 128 from an air supply source (not shown). The tip of the air supply member 128 has a nozzle portion 132 capable of spraying air. The nozzle portion 132 is attached within a space 134 of the holder 118. The nozzle portion 132 and the lower end of the bush 114 face each other via the space 134. Compressed air is sprayed from the nozzle portion 132 of the air supply member 128 toward the outer circumferential surface of the bush 114.

[0067] The detection sensor 130 is disposed on the support block 28, which will be described later. The detection sensor 130 is an air gap sensor. The detection sensor 130 detects the pressure difference of the compressed air injected from the air supply member 128 toward the outer circumferential surface of the bush 114. The pressure difference detected by the detection sensor 130 makes it possible to detect a change in the separation distance between the outer circumferential surface of the bush 114 and a nozzle portion 132 of the air supply member 128.

[0068] When the bushing 114 rotates and the detected portion 126 faces the air supply member 128, the distance between the detected portion 126 and the air supply member 128 becomes smaller, causing a pressure change. Based on this pressure change, the position of the detected portion 126 facing the air supply member 128 along the rotational direction of the bushing 114 is detected. By detecting the rotational position of the bushing 114, the position of the key groove 138 of the bushing 114 can be confirmed. When the detected portion 126 and the air supply member 128 face each other, the positions of the key protrusion 82 of the tool 24 and the key groove 138 of the bushing 114 in the rotational direction match.

[0069] The bush 114 has an insertion hole 136 inside. The insertion hole 136 extends along the axial direction of the bush 114. The insertion hole 136 penetrates the bush 114 in the axial direction. The tool 24 (adapter 52) is inserted into the insertion hole 136 from the upper end of the insertion hole 136. The insertion hole 136 has a constant diameter along the axial direction. When viewed from the axial direction of the bush 114, the inner circumferential surface of the insertion hole 136 is circular. The inner circumferential diameter of the insertion hole 136 is large enough that the tool 24 can be inserted into the insertion hole 136.

[0070] The insertion hole 136 has a key groove (engagement groove) 138. The key groove 138 is recessed radially outward from the inner circumferential surface of the insertion hole 136. The key groove 138 extends along the axial direction of the insertion hole 136. When the tip of the tool 24 is inserted into the insertion hole 136, the key protrusion 82 of the key member 62 is inserted into the key groove 138.

[0071] As shown in FIGS. 8 to 10, the key groove 138 has a tapered groove portion 140 and a groove body 142.

[0072] The tapered groove portion 140 is disposed at the upper portion of the key groove 138. The tapered groove portion 140 has a pair of first and second guide surfaces 144, 146. The first and second guide surfaces 144, 146 are disposed in the width direction of the key groove 138, which is perpendicular to the extension direction of the key groove 138. The first guide surface 144 and the second guide surface 146 are separated by a predetermined distance in the width direction of the key groove 138. The width dimension of the tapered groove portion 140 is larger than the width dimension of the tapered portion 86 of the key member 62.

[0073] 9A to 9C, a straight line AB passes through the central axis S of bushing 114 (the rotation center of bushing 114) and the widthwise center of key groove 138. When the insertion hole 136 is viewed downward, the first guide surface 144 is disposed in a counterclockwise direction with respect to the straight line AB (the direction of arrow B, one side in the widthwise direction of key groove 138). When the insertion hole 136 is viewed downward, the second guide surface 146 is disposed in a clockwise direction with respect to the straight line AB (the direction of arrow C, the other side in the widthwise direction of key groove 138).

[0074] The first guide surface 144 and the second guide surface 146 face each other. The first guide surface 144 and the second guide surface 146 are symmetrical with respect to the line AB. The width dimension of the tapered groove portion 140 gradually decreases toward the lower end of the key protrusion 82. That is, in the width direction of the key groove 138, the distance between the first guide surface 144 and the second guide surface 146 gradually decreases from the upper end of the tapered groove portion 140 toward the groove body 142.

[0075] 9A to 9C, when viewed from above in the axial direction of bushing 114, first guide surface 144 is a curved surface twisted so as to rotate clockwise (in the direction of arrow C) about the axial center of insertion hole 136. When bushing 114 is viewed from above, if the angle formed by line AB and first guide surface 144 is taken as inclination angle θ3, then inclination angle θ3 of first guide surface 144 gradually decreases from the upper end of tapered groove portion 140 toward groove body 142. That is, inclination angle θ3 is largest at the upper end of first guide surface 144. At the lower end of first guide surface 144, first guide surface 144 is parallel to line AB.

[0076] 9A to 9C, when viewed from above in the axial direction of bushing 114, second guide surface 146 is a curved surface twisted so as to rotate counterclockwise about the axial center of insertion hole 136. When bushing 114 is viewed from above, if the angle between line AB and second guide surface 146 is taken as inclination angle θ4, then inclination angle θ4 of second guide surface 146 gradually decreases from the upper end of tapered groove portion 140 toward groove body 142. That is, inclination angle θ4 is largest at the upper end of second guide surface 146. At the lower end of second guide surface 146, second guide surface 146 is parallel to line AB.

[0077] The twisting direction (inclination direction) of the first guide surface 144 and the twisting direction (inclination direction) of the second guide surface 146 are opposite directions. The inclination angles θ3 and θ4 are the same in the extending direction of the bush 114. When viewed from above in the axial direction of the bush 114, the cross-sectional shape of the upper end of the tapered groove portion 140 is a trapezoidal shape that is wider on the radially outward side. That is, at the upper end of the tapered groove portion 140, the interval between the first guide surface 144 and the second guide surface 146 narrows toward the radially inward side of the bush 114. The cross-sectional shape of the lower end of the tapered groove portion 140 is approximately rectangular. That is, at the lower end of the tapered groove portion 140, the first guide surface 144 and the second guide surface 146 are parallel to each other. From the upper end to the lower end of the tapered groove portion 140, the cross-sectional shape of the tapered groove portion 140 gradually changes from a trapezoidal shape to an approximately rectangular shape.

[0078] The groove body 142 is disposed at the lower part of the tapered groove portion 140. The groove body 142 extends from the lower end of the tapered groove portion 140 to the lower end of the key groove 138 in the extension direction of the key groove 138. The width dimension of the groove body 142 is constant along the extension direction of the key protrusion 82. The groove body 142 has a pair of third guide surfaces 148. The width dimension of the groove body 142 is large enough to allow the tapered portion 86 of the key member 62 to be inserted therein. The width dimension of the groove body 142 is slightly larger than the width dimension of the key body 80. The cross-sectional shape of the groove body 142 is rectangular.

[0079] When the tool 24 is lowered together with the tool head 22, the lower end of the tool 24 and the adapter 52 are inserted into the insertion hole 136 of the first rotation support unit 106. At this time, the key protrusion 82 of the key member 62 is inserted into the key groove 138.

[0080] When the key body 80 of the key protrusion 82 is inserted into the tapered groove portion 140 of the key groove 138, the first inclined surface 90 and the first guide surface 144 face each other. When the protrusion body 88 of the key protrusion 82 is inserted into the tapered groove portion 140 of the key groove 138, the second inclined surface 92 and the second guide surface 146 face each other. Either the first inclined surface 90 and the first guide surface 144, or the second inclined surface 92 and the second guide surface 146 are in surface contact with each other.

[0081] The convex portion main body 88 of the key member 62 is guided downward along the tapered groove portion 140 of the key groove 138. The key convex portion 82 of the key member 62 is guided into the groove main body 142 of the key groove 138. At this time, the tapered portion 86 is guided along the groove main body 142, so that the key member 62 and the key groove 138 are positioned relative to each other in the rotation direction of the first rotating support unit 106. As a result, the bush 114 of the first rotating support unit 106 and the tool 24 are positioned relative to each other in the rotation direction of the tool 24. The lower end of the tool 24 is rotatably supported by the bush 114 of the first rotating support unit 106.

[0082] 1 and 2, the support block 28 is accommodated in the accommodation space 36 of the main body frame 14 (see FIG. 1). The support block 28 is exposed to the outside of the main body frame 14 through an opening of the accommodation space 36. When the four jigs 26 rotate together with the support carrier 94, one of the four jigs 26 faces the support block 28. The one jig 26 facing the support block 28 can be held by the support block 28.

[0083] The support block 28 has a plurality of connection portions 150. When the support block 28 and the jig 26 face each other, the connection portions 150 can be connected to the reference seats 102 of the jig 26. In this way, the support block 28 and the jig 26 are positioned at predetermined positions and connected to each other.

[0084] 1, the transfer mechanism 30 is disposed on the second base 34 of the base 12. The transfer mechanism 30 faces the processing station 16. The transfer mechanism 30 includes a moving table 152, a cylinder 154, a workpiece holder 156, a pallet 158, and a pallet holder 160.

[0085] The movable table 152 is disposed horizontally on top of the second base 34. The movable table 152 is movable along the second base 34 in a direction approaching or moving away from the main body frame 14. The cylinder 154 biases the movable table 152 in a direction approaching or moving away from the main body frame 14. The workpiece holder 156 is held by the movable table 152. The workpiece holder 156 extends along the movement direction of the movable table 152. A pallet holder 160 is attached to one end of the workpiece holder 156.

[0086] The pallet holding part 160 faces the processing station 16 and the main body frame 14. The pallet holding part 160 is a plate body that is perpendicular to the axial direction of the workpiece holder 156. The pallet holding part 160 is perpendicular to the moving direction of the movable table 152. The pallet holding part 160 is capable of holding the workpiece W via the pallet 158.

[0087] By moving the movable stage 152 using the cylinder 154, the workpiece W held on the pallet 158 ​​can be moved closer to or away from the processing station 16.

[0088] Next, the operation of the cutting machine 10 will be described.

[0089] First, the movable table 152 of the transport mechanism 30 holds the workpiece W on the pallet 158 ​​at a position separated from the main body frame 14. The cylinder 154 is driven to move the movable table 152 together with the workpiece holder 156 toward the main body frame 14. As a result, the workpiece W reaches the processing station 16, and the workpiece W is held by the jig 26. The support carrier 94 is rotated so that the workpiece W is held by each of the four jigs 26.

[0090] Next, the jig 26 is placed in a position facing the support block 28, and the support block 28 is sent toward the jig 26. The connection portion 150 of the support block 28 comes into contact with the reference seat 102 of the jig 26. The jig 26 and the support block 28 are positioned relative to each other. As a result, the jig 26 is held by the support block 28.

[0091] Next, the lifting motor 44 of the feed mechanism 20 is driven to lower the drive mechanism 18 and the tool head 22 toward the workpiece W. This causes the tool 24 to lower together with the tool head 22. As the tool 24 lowers, the second rotating support unit 110 is inserted into the second support hole 108 of the second support portion 100, and then the tool 24 is inserted into the machining pilot hole H (see FIG. 2 ) of the workpiece W. As the tool 24 further lowers, the adapter 52 is inserted into the insertion hole 136 of the bush 114 in the first rotating support unit 106.

[0092] At this time, in the rotation direction of the tool 24, the positions of the key convex portion 82 of the key member 62 and the key groove 138 of the insertion hole 136 basically coincide with each other. That is, the positions of the key convex portion 82 and the key groove 138 in the rotation direction of the tool 24 are in a positional relationship in which the key convex portion 82 can be inserted into the key groove 138. After the workpiece W is machined by the tool 24, when the tool 24 is raised and removed upward from the insertion hole 136 of the bush 114, the positional relationship between the key convex portion 82 of the key member 62 and the key groove 138 of the insertion hole 136 basically does not change. The positional relationship between the key convex portion 82 of the key member 62 and the key groove 138 of the insertion hole 136 is maintained, and when the next workpiece W is machined, the key convex portion 82 of the key member 62 is inserted into the key groove 138 of the insertion hole 136 as the tool 24 descends.

[0093] 10, if the axial length along the axial direction of the tapered groove portion 140 of the insertion hole 136 formed in the bush 114 is L1 and the axial length along the axial direction from the lower end of the key protrusion 82 of the key member 62 in the tool 24 to the lower end of the tool 24 is L2, the axial length L2 is longer than the axial length L1 of the tapered groove portion 140 (L2>L1). Therefore, when the tool 24 is inserted into the insertion hole 136, the axis of the insertion hole 136 and the axis of the tool 24 coincide with each other.

[0094] As the adapter 52 is inserted into the insertion hole 136, the tapered portion 86 of the key protrusion 82 of the key member 62 is inserted into the tapered groove portion 140 of the key groove 138. At this time, if the key protrusion 82 and the key groove 138 are slightly misaligned in the rotational direction of the tool 24 as shown in Fig. 10, when the tip of the tapered portion 86 is inserted into the upper end of the tapered groove portion 140, the first inclined surface 90 of the tapered portion 86 comes into contact with the first guide surface 144 of the tapered groove portion 140, or the second inclined surface 92 of the tapered portion 86 comes into contact with the second guide surface 146 of the tapered groove portion 140.

[0095] That is, when viewed from above in the axial direction of the tool 24, if the bush 114 is misaligned in the clockwise direction (the direction of the arrow C in Figs. 6A to 6C and 9A to 9C) with respect to the tool 24, the first inclined surface 90 of the key protrusion 82 and the first guide surface 144 of the key groove 138 come into surface contact. When viewed from above in the axial direction of the tool 24, if the bush 114 is misaligned in the counterclockwise direction (the direction of the arrow B in Figs. 6A to 6C and 9A to 9C) with respect to the tool 24, the second inclined surface 92 of the key protrusion 82 and the second guide surface 146 of the key groove 138 come into surface contact. Hereinafter, a case where the first inclined surface 90 and the first guide surface 144 come into contact with each other as shown by the two-dot chain line in Fig. 10 will be described.

[0096] When the tool 24 is further lowered, the first guide surface 144 of the bush 114 moves along the first inclined surface 90 as the first inclined surface 90 comes into contact with the first guide surface 144. At this time, since the first guide surface 144 and the first inclined surface 90 are in surface contact with each other, the first guide surface 144 is stably guided along the first inclined surface 90. As a result, when viewed from above in the axial direction of the tool 24, the bush 114 rotates counterclockwise (in the direction of arrow B) following the movement of the tool 24. As the bush 114 rotates inside the housing 112, the center of the key groove 138 in the width direction approaches the center of the key protrusion 82 in the width direction.

[0097] Then, the bushing 114 further rotates as the tapered portion 86 of the tool 24 descends along the tapered groove portion 140 of the key groove 138. When the upper end of the tapered portion 86 of the key protrusion 82 reaches the lower end of the tapered groove portion 140 of the key groove 138, the center of the width of the key protrusion 82 and the center of the width of the key groove 138 approximately coincide with each other. As a result, the position along the rotational direction of the tool 24 having the key protrusion 82 approximately coincides with the position along the rotational direction of the bushing 114 (first rotation support unit 106) having the key groove 138. In other words, the phases of the tool 24 and the bushing 114 in the rotational direction approximately coincide with each other.

[0098] When the tool 24 is further lowered, the tapered portion 86 of the key protrusion 82 moves into the groove body 142 of the key groove 138. The protrusion body 88 is guided downward along the groove body 142. As a result, the protrusion body 88 and the groove body 142 engage with each other, and the phases of the rotational directions of the tool 24 and the bush 114 become approximately the same. Relative rotation between the tool 24 and the bush 114 is restricted.

[0099] As a result, the key protrusion 82 is engaged with the key groove 138, so that the tool 24 and the bush 114 can rotate together. Thus, the lower end of the tool 24 is rotatably supported by the bush 114 of the first rotation support unit 106, and the vicinity of the upper end of the tool 24 is rotatably supported by the second rotation support unit 110.

[0100] When the key protrusion 82 is inserted into the key groove 138 and the second inclined surface 92 and the second guide surface 146 come into contact with each other, the bush 114 rotates clockwise (in the direction of arrow C) to follow the tool 24 in association with the contact between the second inclined surface 92 and the second guide surface 146. At this time, since the second guide surface 146 and the second inclined surface 92 are in surface contact with each other, the second guide surface 146 is stably guided along the second inclined surface 92. As the bush 114 rotates, the center of the width of the key groove 138 coincides with the center of the width of the key protrusion 82, and the phases of the rotational directions of the tool 24 and the bush 114 approximately coincide with each other.

[0101] Next, the workpiece W is moved slightly in the horizontal direction by the transport mechanism 30, so that the axis of the pilot hole H in the workpiece W is aligned with the axis of the tool 24. The drive motor 42 is driven to rotate and further lower the tool 24. As a result, the inner surface of the pilot hole H is machined by the cutting tool 50, which rotates together with the tool 24. The inner surface of the pilot hole H in the workpiece W is machined to the desired inner diameter.

[0102] At this time, the lower end and the upper end of the tool 24 along the extension direction of the tool 24 are rotatably supported by the jig 26 via the first and second rotation support units 106, 110. Therefore, when the workpiece W is machined by the tool 24, the tool 24 is prevented from being pressed and deformed by the reaction force applied from the workpiece W to the tool 24.

[0103] When machining the pilot hole H of another workpiece W held by the support carrier 94, first, the drive mechanism 18 raises the tool 24 away from the workpiece W, and then the jig 26 holding the workpiece W that has been machined is disconnected from the support block 28. Next, the support carrier 94 is rotated to bring the jig 26 holding the next workpiece W into opposition to the support block 28. Then, the support block 28 is sent out toward the jig 26, and the jig 26 and the support block 28 are positioned in predetermined positions, after which the tool head 22 is lowered and the tool 24 machines the pilot hole H of the workpiece W.

[0104] As described above, the embodiment of the present invention includes the tool 24 capable of being rotated to machine the workpiece W, and the first rotation support unit 106 including the bush 114 having the insertion hole 136 into which the tip of the tool 24 is inserted. The tip of the tool 24 is provided with the key member 62 having the key protrusion 82. The insertion hole 136 of the bush 114 is provided with the key groove 138 recessed radially outward from the inner circumferential surface of the insertion hole 136. The key protrusion 82 of the key member 62 can be inserted into the key groove 138. The key protrusion 82 includes a tapered portion 86. The tapered portion 86 has first and second inclined surfaces 90, 92 whose separation distance decreases downward.

[0105] When the tool 24 is viewed downward, the first inclined surface 90 is disposed in a counterclockwise direction with respect to the center of the width direction of the tapered portion 86. The first inclined surface 90 is a curved surface that is twisted clockwise with respect to the axial center of the tool 24 as it faces downward. When the tool 24 is viewed downward, the second inclined surface 92 is disposed in a clockwise direction with respect to the center of the width direction of the tapered portion 86. The second inclined surface 92 is a curved surface that is twisted counterclockwise with respect to the axial center of the tool 24 as it faces downward.

[0106] The keyway 138 includes a tapered groove portion 140 having first and second guide surfaces 144, 146 whose separation distance decreases toward the bottom. When the insertion hole 136 is viewed downward, the first guide surface 144 is disposed in a counterclockwise direction with respect to the center of the width of the keyway 138, and the second guide surface 146 is disposed in a clockwise direction with respect to the center of the width of the keyway 138. The first guide surface 144 is a curved surface that is twisted clockwise with respect to the axial center of the insertion hole 136 toward the bottom. The second guide surface 146 is a curved surface that is twisted counterclockwise with respect to the axial center of the insertion hole 136 toward the bottom.

[0107] When machining the workpiece W with the tool 24 in the cutting machine 10, the tool 24 is lowered along the main body frame 14, and the tip of the tool 24 is inserted into the insertion hole 136 of the bush 114 in the first rotation support unit 106. When the key protrusion 82 of the key member 62 is inserted into the key groove 138 of the insertion hole 136, either the first inclined surface 90 and the first guide surface 144, or the second inclined surface 92 and the second guide surface 146 come into surface contact with each other. As a result, the tool 24 is further lowered while either the first inclined surface 90 and the first guide surface 144, or the second inclined surface 92 and the second guide surface 146 come into surface contact with each other.

[0108] As a result, the bushing 114 rotates following the tool 24 so that the widthwise center of the key groove 138 faces the widthwise center of the key protrusion 82. Since the widthwise center of the key groove 138 and the widthwise center of the key member 62 approximately coincide with each other, the key body 80 of the key member 62 is inserted into the groove body 142 of the key groove 138, and the rotational phases of the tool 24 and the bushing 114 can be approximately matched.

[0109] Therefore, by machining the tip of the tool 24 and inserting it into the insertion hole 136 of the bush 114 in the first rotation support unit 106 and engaging the key protrusion 82 of the key member 62 with the key groove 138, it is possible to easily and reliably match the phase of the rotational direction between the tool 24 and the bush 114. As a result, when the tool 24 is rotated to machine the workpiece W, the tool 24 can be rotatably supported by the bush 114.

[0110] Compared to a case where the tool 24 is lowered to insert the tip of the tool 24 into the insertion hole 136 of the first rotary support unit 106, and then the tool 24 is rotated to match the phase with the bush 114, the phase can be matched simply by inserting the tool 24 into the insertion hole 136. Therefore, the operation time when machining the workpiece W with the cutting machine 10 can be shortened. Since the key member 62 is fixed to the tip of the tool shaft 25, no malfunction due to cutting chips generated by the cutting machine 10 occurs, and the key member 62 can always be stably inserted into the key groove 138. This allows the rotational phases of the tool 24 and the bush 114 to be matched.

[0111] The first rotation support unit 106 is provided with a detection mechanism 124 that detects the rotational position of the bush 114. The detection mechanism 124 detects the rotational position of the bush 114, thereby making it possible to detect the rotational position of the key groove 138. This makes it possible to check whether or not the position of the key protrusion 82 and the position of the key groove 138 match to an extent that the key protrusion 82 can be inserted into the key groove 138 in the rotational direction of the tool 24 and the bush 114. If the position of the key groove 138 is not appropriate in the rotational direction of the bush 114 for some reason (if the position of the bush 114 in the rotational direction is such that the key protrusion 82 cannot be inserted into the key groove 138), an alert to that effect is issued to the user.

[0112] The detection mechanism 124 includes a detection target portion 126 that is disposed on the outer periphery of the bush 114 and protrudes radially outward, and a detection sensor 130 capable of detecting the detection target portion 126. The detection sensor 130 detects the pressure difference of compressed air injected from the air supply member 128 toward the detection target portion 126. Based on the pressure difference, the position of the detection target portion 126 facing the air supply member 128 along the rotational direction of the bush 114 is detected. By detecting the position of the bush 114 in the rotational direction, the position of the key groove 138 of the bush 114 can be confirmed.

[0113] The adapter 52 including the key member 62 is detachably disposed at the tip of the tool 24. Therefore, the key member 62 can be easily replaced with a new one for the tool 24 depending on the type or application of the tool 24.

[0114] An upper end of the tool 24 is connected to a drive mechanism 18 that rotates the tool 24, and the upper end is rotatably supported via a second rotation support unit 110 disposed on the main body frame 14. As a result, both ends of the tool 24 are rotatably supported by the first and second rotation support units 106, 110. Therefore, when machining a workpiece W with the tool 24, even if a reaction force from the workpiece W is applied to the tool 24, warping (deformation) of the tool 24 is suppressed.

[0115] The above embodiment can be summarized as follows.

[0116] The above embodiment includes a main body frame (14), a shaft-shaped tool (24) that is linearly movably disposed along the main body frame and is rotationally driven; a rotary support unit (106) having a rotary body (114) provided with an insertion hole (136) into which a tip portion of the tool along the moving direction is inserted, the rotary body being rotatable together with the tool inserted into the insertion hole, the tool is inserted into the insertion hole by moving in a first direction along an axial direction of the tool; The tip end of the tool is provided with an engagement protrusion (82) that protrudes radially outward of the tool and extends along the axial direction of the tool, the insertion hole includes an engagement groove (138) extending along the axial direction of the rotor and recessed from an inner peripheral surface of the insertion hole radially outwardly of the insertion hole into which the engagement protrusion is inserted; The engaging protrusion is A protrusion body (88) formed with a substantially constant width along the axial direction of the tool; a tapered portion (86) having first and second inclined surfaces (90, 92) disposed adjacent to each other in the first direction of the protrusion main body, the distance between which decreases toward the first direction; Equipped with When the tool is viewed in the first direction, the first inclined surface (90) is disposed in a counterclockwise direction with respect to a center of the width direction of the tapered portion, and the second inclined surface (92) is disposed in a clockwise direction with respect to the center of the width direction of the tapered portion, the first inclined surface is a surface twisted clockwise with respect to an axial center of the tool toward the first direction, and the second inclined surface is a surface twisted counterclockwise with respect to an axial center of the tool toward the first direction, the rotor has an end surface facing a second direction that is opposite to the first direction, The engagement groove is a tapered groove portion (140) having first and second guide surfaces (144, 146) extending in the first direction from the end surface of the rotor and having a distance therebetween that decreases in the first direction, the tapered groove portion (140) being wider than the tapered portion; a groove body (142) disposed adjacent to the tapered groove portion in the first direction and formed with a substantially constant width along the axial direction of the rotor; Equipped with When the insertion hole is viewed in the first direction, the first guide surface (144) is disposed in a counterclockwise direction with respect to a center of the width direction of the engagement groove, and the second guide surface (146) is disposed in a clockwise direction with respect to the center of the width direction of the engagement groove, The first guide surface is a surface twisted clockwise around the axial center of the insertion hole toward the first direction, and the second guide surface is a surface twisted counterclockwise around the axial center of the insertion hole toward the first direction.

[0117] A detection mechanism (124) is provided for detecting the position of the rotating body in the rotational direction.

[0118] The detection mechanism includes a detection target portion (126) that is disposed on the outer periphery of the rotor and protrudes radially outward; a detection sensor (130) for detecting the detection target portion; Equipped with.

[0119] The engaging protrusion is detachably disposed on the tip portion of the tool.

[0120] The tool has a base end that is arranged in the opposite direction to the tip end of the tool and is connected to a drive mechanism (18) that rotates the tool, and the base end is rotatably supported by a second rotation support unit (110) that is arranged on the main body frame.

[0121] The present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0122] 10... Cutting machine 14... Main body frame 18...Drive mechanism 24...Tools 52 ... adapter 62 ... key member 82...Key protrusion 86...Tapered portion 90...First inclined surface 92...Second inclined surface 106: First rotating support unit 110: Second rotating support unit 124...detection mechanism 138...key groove 140... Tapered groove portion 144... First guide surface 146…Second guide surface W…Work

Claims

1. A main body frame (14); a shaft-shaped tool (24) that is arranged so as to be linearly movable along the main body frame and is driven to rotate; A cutting machine (10) including a rotating body (114) having an insertion hole (136) into which a tip portion of the tool along the moving direction is inserted, and a rotation support unit (106) in which the rotating body can rotate together with the tool inserted into the insertion hole, The tool is inserted into the insertion hole by moving in a first direction along an axial direction of the tool, The tip of the tool is provided with an engagement protrusion (82) that protrudes radially outward of the tool and extends along the axial direction of the tool, the insertion hole includes an engagement groove (138) extending along the axial direction of the rotor and recessed radially outward from an inner circumferential surface of the insertion hole into which the engagement protrusion is inserted; The engaging protrusion is A protrusion body (88) formed with a substantially constant width along the axial direction of the tool; a tapered portion (86) having first and second inclined surfaces (90, 92) arranged adjacent to each other in the first direction of the protrusion main body, the distance between which decreases toward the first direction; Equipped with When the tool is viewed in the first direction, the first inclined surface (90) is disposed in a counterclockwise direction with respect to a width center of the tapered portion, and the second inclined surface (92) is disposed in a clockwise direction with respect to the width center of the tapered portion, the first inclined surface is a surface twisted clockwise with respect to an axial center of the tool toward the first direction, and the second inclined surface is a surface twisted counterclockwise with respect to an axial center of the tool toward the first direction, the rotor has an end surface facing a second direction that is opposite to the first direction, The engagement groove is a tapered groove portion (140) having first and second guide surfaces (144, 146) extending in the first direction from the end surface of the rotor and having a distance therebetween that decreases in the first direction, the tapered groove portion (140) being wider than the tapered portion; a groove body (142) disposed adjacent to the tapered groove portion in the first direction and formed with a substantially constant width along the axial direction of the rotor; Equipped with When the insertion hole is viewed in the first direction, the first guide surface (144) is disposed in a counterclockwise direction with respect to a center of the width direction of the engagement groove, and the second guide surface (146) is disposed in a clockwise direction with respect to the center of the width direction of the engagement groove, the first guide surface is a surface twisted clockwise about an axial center of the insertion hole toward the first direction, and the second guide surface is a surface twisted counterclockwise about an axial center of the insertion hole toward the first direction, A detection mechanism (124) for detecting the position of the rotating body in the rotational direction, the detection mechanism including a detection target portion (126) disposed on the outer periphery of the rotating body and protruding radially outward, and a detection sensor (130) for detecting the detection target portion; A cutting machine equipped with the above-mentioned.

2. (delete)

3. (delete)

4. 2. The cutting machine according to claim 1, The engaging protrusion is detachably arranged on the tip portion of the tool.

5. The cutting machine according to claim 1 or 4, The tool is arranged in the opposite direction to the tip end of the tool and has a base end to which a drive mechanism (18) that rotates the tool is connected, and the base end is rotatably supported by a second rotation support unit (110) arranged on the main body frame.

Images