JP6902691B2 - Work machine with position correction function. - Google Patents

Description

The present invention relates to a work machine with a position correction function in which a tool attachment portion is attached to a tool holder that can rotate integrally with a spindle so that the tool attachment portion can be corrected in the radial direction.

Generally, a tool attached to a tool holder, for example, various machine tools for processing a work through a processing tool are used. The machine tool is usually incorporated in a work machine having a function and a mechanism for working in conjunction with the operation of the machine tool.

For example, in the boring process of the cylinders constituting the engine block, it is necessary to process the inner cylinder diameter dimension with high accuracy on the order of microns. However, in an automobile engine, if the same cutting edge is used in the mass production process, the cutting edge is worn even with a hard tool such as a CBN tool. Therefore, since the machining diameter of the cutting edge of the tool becomes smaller due to wear, a correction tool holder having a correction function is adopted so as to maintain a constant hole diameter.

Therefore, the fine boring device disclosed in Patent Document 1 is known. This fine boring device has a holder that is non-rotatably attached to the spindle of the machine tool, and an eccentric fitting portion that is rotatably arranged on the center line of the holder and is eccentric to the center line. The eccentric member and the base end portion are fitted to the eccentric fitting portion so as to be relatively rotatable, and the boring cutting tool is attached to the tip portion so that the cutting tool holder is arranged so as not to rotate relative to the holder. It is equipped with a member. Then, the eccentric member is rotated relative to the holder, so that the position of the cutting edge of the cutting tool with respect to the center line of the holder is corrected.

Further, the fine boring device is provided with a pair of moving members arranged so as to be reciprocally movable in the holder, and a non-rotating member located in the vicinity of the main shaft. The pair of moving members can fix the holder to the spindle that always stops in a constant rotational phase in a predetermined relative phase, and provide a ratchet wheel to the eccentric member while engaging with each ratchet wheel in one direction. As a result, the ratchet wheel is rotated in both forward and reverse directions and is always urged in the other direction by the urging means. The non-rotating member is provided with a contact member that is brought into contact with each moving member by relative movement with respect to the holder and moves the moving member in one direction.

Japanese Unexamined Patent Publication No. 61-241007

In the above-mentioned Patent Document 1, an eccentric ring structure (eccentric member) is used in order to correct the position of the cutting edge of the cutting tool. Therefore, when the slider (moving member) is driven (pushed) by the drive rod (contact member), the correction operation amount of the cutting edge position of the cutting tool becomes a sine curve. As a result, the correction instruction and the correction operation do not have a direct proportional relationship, and there is a problem that the control becomes considerably complicated.

For example, when the amount of eccentricity is 0.1 mm, an operating amount of 0.1 mm × (sin1 ° −sin0 °) = 1.7 μm can be obtained when 1 ° is controlled near the center of the operating range. On the other hand, at the phase position of 60 ° of the sine curve, the operating amount is 0.1 mm × (sin61 ° −sin60 °) = 0.9 μm, which is about half the operating amount near the center. Therefore, the relationship between the amount controlled by the push operation and the correction amount is complicated.

Further, in Patent Document 1 described above, the ratchet claw rotates the ratchet wheel by pressing the slider with NC, and the eccentric ring integrated with the ratchet wheel rotates. However, the environment in which the fine boring device is used is often in a poor condition where chips and coolant are scattered. Therefore, the ratchet claw that converts the push operation into rotation causes a poor engagement between the ratchet claw and the ratchet wheel teeth even if there is slight wear, dust, or scratches on the engaging portion, and the desired operation occurs. Function may be lost.

The present invention solves this kind of problem, and provides a work machine with a position correction function capable of correcting the position of a tool attached to a tool holder with high accuracy and easily in a simple and compact configuration. The purpose is to do.

The work machine with a position correction function according to the present invention has a tool holder that can rotate integrally with a spindle, and a tip portion of the tool holder opposite to the spindle in a radial direction that intersects the rotation axis direction of the tool holder. It is provided with a tool mounting portion to which the tool is mounted so as to be movable, and an adjusting device built in the tool holder to correct the position of the tool mounting portion in the radial direction. The adjusting device includes an operating member, a rotating shaft member, a first pinion member, a second pinion member, a first rack member, and a second rack member.

The operating member has an inclined surface that is inclined in the radial direction toward the rotation axis direction and abuts on the engaging portion of the tool mounting portion. The rotating shaft member extends in the direction of the rotating shaft, and one end of the rotating shaft member is screwed into the operating member to rotate, so that the operating member is moved forward and backward in the direction of the rotating shaft. The first pinion member is provided on the outer periphery of the other end of the rotary shaft member, and rotates integrally with the rotary shaft member only in the first rotation direction via the first one-way clutch. The second pinion member is provided on the outer periphery of the other end of the rotary shaft member, and rotates integrally with the rotary shaft member only in the second rotation direction opposite to the first rotation direction via the second one-way clutch. There is. The first rack member is arranged so as to be able to advance and retreat so as to intersect in the direction of the rotation axis, and when an external load is applied , the first rack member meshes with the first pinion member to integrally form the first pinion member with the rotation shaft member. while being rotated in one rotational direction, meshing with the first pinion member when said external load is not applied it is released. The second rack member is arranged so as to be able to advance and retreat so as to intersect in the direction of the rotation axis, and when an external load is applied , the second rack member meshes with the second pinion member to integrally form the second pinion member with the rotation shaft member. While rotating in two rotation directions, the engagement with the second pinion member is released when the external load is not applied .

Further, in the tool holder, a first opening in which the first rack member is slidably arranged and a second opening in which the second rack member is slidably arranged sandwich the rotary shaft member. It is preferable that one end of the first opening and one end of the second opening are open to the outside while being formed parallel to each other.

Further, a first elastic member that presses the first rack member toward one end side of the first opening is arranged at the other end of the first opening, while a first elastic member is arranged at the other end of the second opening. It is preferable that a second elastic member that presses the two rack members on one end side of the second opening is arranged.

Furthermore, the work machine with a position correction function includes an operation mechanism for operating the first rack member and the second rack member from the outside, and the operation mechanism is on one end side of the first opening and one end side of the second opening. It is preferable that the first rack member and the pressing member for pressing the second rack member are provided.

Further, a first key groove extending in the advancing / retreating direction of the first rack member is formed on the outer peripheral portion of the first rack member, while the outer peripheral portion of the second rack member is formed by the second rack member. It is preferable that a second key groove extending in the advancing / retreating direction is formed. At that time, the tool holder is inserted into the first key groove to regulate the rotation and pop-out of the first rack member, and the tool holder is inserted into the second key groove to rotate and pop out the second rack member. It is preferable that a second key member for regulation is provided.

Further, the tool holder includes a first rotation stopper member that regulates the rotation of the first pinion member at a position where the first rack member and the first pinion member are disengaged, a second rack member, and a second pinion member. It is preferable that a second rotation stop member that regulates the rotation of the second pinion member is provided at a position where the meshing with the pinion member is released.

Furthermore, it is preferable that the tool holder is provided with an elastic member that presses the engaging portion of the tool mounting portion against the inclined surface of the operating member.

Further, at the tip of the tool holder and the end of the tool mounting portion on the tool holder side, a pair of dovetail grooves and a pair of protrusions fitted to the dovetail grooves extend in the moving direction of the tool mounting portion. It is preferable that it is formed.

Further, it is preferable that the sliding portion provided with one dovetail groove constitutes an elastically deformed portion by forming a slit extending along the one dovetail groove.

Furthermore, it is preferable that the tool holder is provided with a screw member that presses the elastically deformed portion against one of the protrusions.

In the work machine with a position correction function according to the present invention, when the first rack member is pressed, the first pinion member that meshes with the first rack member has a rotation shaft in the first rotation direction via the first one-way clutch. It rotates integrally with the member. When the rotating shaft member rotates in the first rotation direction, the operating member to which one end of the rotating shaft member is screwed moves in one direction. At that time, the tool mounting portion that comes into contact with the inclined surface of the operating member moves in one of the radial directions of the tool holder along the inclination of the inclined surface.

Further, when the second rack member is pressed, the second pinion member that meshes with the second rack member rotates integrally with the rotation shaft member in the second rotation direction via the second one-way clutch. When the rotating shaft member rotates in the second rotation direction, the operating member to which one end of the rotating shaft member is screwed moves in the other direction. At that time, the tool mounting portion that comes into contact with the inclined surface of the operating member moves to the other side in the radial direction of the tool holder along the inclination of the inclined surface.

In this way, the number of times the first rack member or the second rack member is pressed, the amount of pushing the first rack member or the second rack member, and the amount of movement of the tool attached to the tool mounting portion in the radial direction. There is a proportional relationship with (correction amount). Therefore, in particular, the effect of simplifying the control by the NC program at once can be obtained. Moreover, the first rack member and the second rack member are not affected by each other's movements, and the rotation shaft member can be rotated independently in the first rotation direction and the second rotation direction. Therefore, the radial adjustment work of the tool mounting portion can be easily and surely performed.

Further, the adjusting device for correcting the radial position of the tool mounting portion adopts a rack and pinion structure. As a result, as compared with the case where, for example, a ratchet claw structure is used as the adjusting device, the desired operating function can be maintained reliably and stably, and the position correction process can be efficiently performed. Therefore, the tool attached to the tool holder can be easily and accurately corrected in the radial direction of the tool holder on the order of microns.

It is a perspective explanatory view of the machine tool which comprises the work machine with the position correction function which concerns on 1st Embodiment of this invention. It is sectional drawing of the main part of the machine | machine. It is sectional drawing of the tip side of the tool holder which constitutes the machine tool, and the tool attachment part. It is a front view of the tip side of the tool holder. FIG. 2 is a sectional view taken along line VV of FIG. 2 of the tool holder. FIG. 5 is a sectional view taken along line VI-VI of the tool holder in FIG. It is operation explanatory drawing at the time of engaging the outer peripheral part of the tool holder with an operation mechanism. It is an operation explanatory drawing of the adjustment device provided in the tool holder. FIG. 5 is an explanatory cross-sectional view of a main part of a tool holder provided in a machine tool constituting a work machine with a position correction function according to a second embodiment of the present invention.

As shown in FIG. 1, the machine tool 10 constituting the work machine with a position correction function according to the first embodiment of the present invention includes a main body portion 12, and a spindle housing 14 is an X-axis in the main body portion 12. It is mounted so as to be slidable in the direction, the Y-axis direction, and the Z-axis direction. As shown in FIG. 2, a spindle (spindle) 16 is rotatably provided in the spindle housing 14 via a bearing 18, and a tool holder 20 is detachably attached to the spindle 16. The work machine of the present application has a function and a mechanism in which a tool holder 20 mounted on the spindle 16 of the machine tool 10 works in conjunction with the operation of the machine tool 10.

The tool holder 20 has a shank portion 22 connected to the spindle 16, and the main body housing 24 is integrally provided with the shank portion 22. A tool is attached to the tip of the main body housing 24 opposite to the shank portion 22 side (spindle 16 side) so that the tool holder 20 can be moved in the radial direction (arrow R direction) intersecting the rotation axis direction (arrow L direction). The part 26 is attached. A tool, for example, a boring bar 28, is attached to the tip of the tool attachment portion 26.

As shown in FIG. 3, a pair of dovetail grooves 30a and 30b are formed on the tip surface 24e (tip portion of the tool holder 20) of the main body housing 24. A pair of protrusions 32a, 32b that fit into the dovetail grooves 30a, 30b are formed at the end portion 26a of the tool mounting portion 26 on the main body housing 24 side. The dovetail grooves 30a and 30b and the protrusions 32a and 32b are formed so as to extend in the moving direction of the tool mounting portion 26 (in the direction of arrow R in FIG. 4). As shown in FIGS. 3 and 4, the sliding portion provided with the one dovetail groove 30a forms the elastically deformed portion 36 by forming the slit 34 extending along the one dovetail groove 30a. Configure.

As shown in FIG. 2, the engaging portion 38 is formed so as to protrude inward from the tip surface 24e of the main body housing 24 at the end portion 26a of the tool mounting portion 26. The engaging portion 38 has a contact portion 38a that is parallel to the rotation axis of the main body housing 24 and projects hemispherically toward the rotation axis. A pressurizing spring (elastic member) 40 that presses the engaging portion 38 of the tool mounting portion 26 against the inclined surface 44a of the operating member 44, which will be described later, is arranged in the main body housing 24.

The tool holder 20 has a built-in adjustment device 42 that corrects the position of the tool attachment portion 26 in the radial direction (arrow R direction). As shown in FIGS. 2 and 5, the adjusting device 42 includes an operating member 44, a rotating shaft member 46, a first pinion member 48A, a second pinion member 48B, a first rack member 50A, and a second rack member 50B. As shown in FIGS. 2 and 4, the actuating member 44 has a substantially block shape and is slidably arranged in the arrow L direction along the inner wall surface 52 of the main body housing 24. The operating member 44 has an inclined surface 44a that is inclined inward in the radial direction toward the front in the rotation axis direction (arrow Lf direction) and abuts on the contact portion 38a of the tool mounting portion 26. A screw hole 54 is formed through the operating member 44.

The rotating shaft member 46 extends along the rotating axis, and at one end, a screw portion 56 screwed into the screw hole 54 of the operating member 44 is provided. As shown in FIGS. 2 and 5, the first pinion member 48A is provided on the outer periphery of the other end of the rotating shaft member 46, and is provided in the first rotation direction (arrow A in FIG. 5) via the first one-way clutch 58A. It rotates integrally with the rotary shaft member 46 only in the direction). The first rotation direction is a rotation direction in which the operating member 44 screwed into the rotation shaft member 46 is moved in the arrow Lb direction (spindle 16 side) in FIG. 2, for example.

The second pinion member 48B is provided on the outer periphery of the other end of the rotary shaft member 46 in parallel with the first pinion member 48A, and is subjected to a second rotation opposite to the first rotation direction via the second one-way clutch 58B. It rotates integrally with the rotary shaft member 46 only in the direction (in the direction of arrow B in FIG. 5). The second rotation direction is a rotation direction in which the operating member 44 screwed into the rotation shaft member 46 is moved in the arrow Lf direction (boring bar 28 side) in FIG. 2, for example.

As shown in FIG. 5, in the main body housing 24, a first sliding hole portion (first opening) 60a in which the first rack member 50A is slidably arranged and a second rack member 50B are slidable. The second sliding hole portion (second opening portion) 60b arranged in the above is formed parallel to each other with the rotary shaft member 46 interposed therebetween. The first rack member 50A is slidably arranged in the first sliding hole portion 60a in the direction intersecting the rotation axis direction (arrow R direction), while the second sliding hole portion 60b has a second sliding hole portion 60b. The rack member 50B is slidably arranged in the direction of arrow R. One end of the first sliding hole portion 60a and one end of the second sliding hole portion 60b are opened to the outside.

The first rack member 50A is provided with a sliding portion 64a that is in sliding contact with the inner peripheral surface of the first sliding hole portion 60a via a gasket 62a at one end, and is provided with a first rack gear 66a that meshes with the first pinion member 48A. (See FIGS. 5 and 6). The first rack member 50A is formed with a first key groove 68a extending in the advancing / retreating direction of the first rack member 50A on a side portion opposite to the first rack gear 66a. The main body housing 24 is provided with a first key member 70a that is inserted into the first key groove 68a to regulate the rotation and popping out of the first rack member 50A.

At the other end (bottom portion) of the first sliding hole portion 60a, a first spring (first elastic member) 72a that presses the first rack member 50A toward one end side (open side) of the first sliding hole portion 60a. Is placed. When no external load is applied to the first rack member 50A, the first key member 70a engages with the end of the first key groove 68a under the pressing action of the first spring 72a, and the first rack member 50A and the first rack gear 66a. The meshing relationship with the first pinion member 48A is released (see FIG. 5).

The second rack member 50B is provided with a sliding portion 64b that is in sliding contact with the inner peripheral surface of the second sliding hole portion 60b via a gasket 62b at one end, and is provided with a second rack gear 66b that meshes with the second pinion member 48B ( (See FIGS. 5 and 6). The second rack member 50B is formed with a second key groove 68b extending in the advancing / retreating direction of the second rack member 50B on a side portion opposite to the second rack gear 66b. The main body housing 24 is provided with a second key member 70b that is inserted into the second key groove 68b to regulate the rotation and pop-out of the second rack member 50B.

A second spring (second elastic member) 72b that presses the second rack member 50B toward one end side (open side) of the second sliding hole portion 60b at the other end (bottom portion) of the second sliding hole portion 60b. Is placed. When no external load is applied to the second rack member 50B, the second key member 70b engages with the end of the second key groove 68b under the pressing action of the second spring 72b, and the second rack member 50B and the second rack gear 66b. The meshing relationship with the second pinion member 48B is released (see FIG. 5).

As shown in FIG. 2, the main body housing 24 has a first rotation stop member that regulates the rotation of the first pinion member 48A at a position where the first rack gear 66a and the first pinion member 48A are disengaged. For example, a first ball plunger 74a is provided. The main body housing 24 has a second rotation stopper member that regulates the rotation of the second pinion member 48B at a position where the second rack gear 66b and the second pinion member 48B are disengaged, for example, a second ball plunger 74b. Is provided.

As shown in FIG. 1, the machine tool 10 includes an operation mechanism 76 for operating the first rack member 50A and the second rack member 50B from the outside. The operating mechanism 76 is selectively inserted into one end side of the first sliding hole portion 60a and one end side of the second sliding hole portion 60b, and selectively presses the first rack member 50A and the second rack member 50B. A pressing member 78 is provided.

The operation of the machine tool 10 according to the first embodiment configured in this way will be described below.

When the cutting edge of the boring bar 28 is worn, the position of the boring bar 28 is adjusted (corrected) in the radial direction via the adjusting device 42. For example, the machine tool 10 is automatically operated according to program control (NC control). Then, the main body housing 24 of the machine machine 10 is connected to the operation mechanism 76 at a specific phase by the orientation function. Specifically, as shown in FIG. 7, the second sliding hole portion 60b of the main body housing 24 is arranged coaxially (in the same phase) with the pressing member 78. Next, the tool holder 20 is transferred in the radial direction by NC control, and the pressing member 78 is inserted into the second sliding hole portion 60b. The above operation can also be performed manually instead of NC control.

As shown in FIG. 8, the pressing member 78 presses the second rack member 50B in the direction of arrow C while relatively entering the inside of the second sliding hole portion 60b (direction of arrow C). The second rack member 50B moves to the bottom side of the second sliding hole portion 60b against the elastic force of the second spring 72b. Therefore, the second rack gear 66b of the second rack member 50B meshes with the second pinion member 48B to rotate the second pinion member 48B to a predetermined angle position in the arrow B direction.

The second pinion member 48B is provided with a second one-way clutch 58B, and the second one-way clutch 58B rotates integrally with the rotation shaft member 46 in the direction of arrow B, which is the second rotation direction, to a predetermined angle position. To do. As shown in FIG. 2, the screw portion 56 provided at the tip of the rotating shaft member 46 is screwed into the screw hole 54 of the operating member 44, and the screw portion 56 rotates in the arrow B direction by a predetermined angle. Then, the operating member 44 moves in the direction of the arrow Lf by a predetermined distance. Therefore, the tool mounting portion 26 provided with the contact portion 38a that abuts on the inclined surface 44a of the operating member 44 moves outward in the radial direction of the tool holder 20 by a predetermined distance (plus correction). As a result, the boring bar 28 provided in the tool mounting portion 26 moves outward in the radial direction to increase the machining diameter.

Then, when the pressing member 78 is relatively separated from the second sliding hole portion 60b by NC control (or manual operation) (in the direction of arrow D in FIG. 8), the second rack member 50B is subjected to the second spring. It moves to the open end side of the second sliding hole portion 60b via the elastic force of 72b. Therefore, the second pinion member 48B that meshes with the second rack member 50B rotates in the direction of arrow A, while the rotation shaft member 46 does not rotate via the second one-way clutch 58B. Therefore, the operating member 44 does not move, and the position of the boring bar 28 does not change. Then, similarly to the above, by repeating the pressing operation of the second rack member 50B a predetermined number of times, the boring bar 28 moves outward in the radial direction by a predetermined amount and is adjusted to a desired processing diameter.

On the other hand, the pressing member 78 presses the first rack member 50A in the direction of arrow C in FIG. 8 while relatively entering the inside of the first sliding hole portion 60a by NC control (or manual operation). To do. The first rack member 50A moves to the bottom side of the first sliding hole portion 60a against the elastic force of the first spring 72a. Therefore, the first rack gear 66a of the first rack member 50A meshes with the first pinion member 48A to rotate the first pinion member 48A to a predetermined angle position in the arrow A direction.

The first pinion member 48A is provided with a first one-way clutch 58A, and the first one-way clutch 58A rotates integrally with the rotation shaft member 46 in the direction of arrow A, which is the first rotation direction, to a predetermined angle position. To do. As shown in FIG. 2, when the screw portion 56 of the rotating shaft member 46 rotates in the arrow A direction by a predetermined angle, the operating member 44 moves in the arrow Lb direction by a predetermined distance. Therefore, the tool mounting portion 26 provided with the contact portion 38a that abuts on the inclined surface 44a of the operating member 44 moves inward in the radial direction of the tool holder 20 by a predetermined distance (minus correction). As a result, the boring bar 28 provided in the tool mounting portion 26 moves inward in the radial direction to reduce the machining diameter.

In the boring process, so-called positive correction control is performed in which the position of the cutting edge is adjusted in the diameter expansion direction in response to the reduction in diameter due to wear. Then, after the positive correction is repeatedly performed every several μm, when the wear limit of the cutting edge is reached, the correction state is returned to 0, that is, the negative correction (diameter reduction direction) is controlled. A new cutting edge is installed.

In this case, in the first embodiment, when the second rack member 50B is pressed, the second pinion member 48B that meshes with the second rack member 50B is directed in the arrow B direction (the first) via the second one-way clutch 58B. It rotates integrally with the rotation shaft member 46 in two rotation directions). When the rotating shaft member 46 rotates in the direction of arrow B, the operating member 44 into which one end (screwed portion 56) of the rotating shaft member 46 is screwed moves in the direction of arrow Lf. At that time, the tool mounting portion 26 that abuts on the inclined surface 44a of the operating member 44 moves outward in the radial direction of the tool holder 20 along the inclination of the inclined surface 44a.

On the other hand, when the first rack member 50A is pressed, the first pinion member 48A that meshes with the first rack member 50A is a rotary shaft member in the arrow A direction (first rotation direction) via the first one-way clutch 58A. It rotates integrally with 46. When the rotating shaft member 46 rotates in the direction of arrow A, the operating member 44 into which one end of the rotating shaft member 46 is screwed moves in the direction of arrow Lb. At that time, the tool mounting portion 26 that abuts on the inclined surface 44a of the operating member 44 moves inward in the radial direction of the tool holder 20 along the inclination of the inclined surface 44a.

In this way, the number of times the first rack member 50A or the second rack member 50B is pressed, the amount of pushing the first rack member 50A or the second rack member 50B, and the bowling bar 28 attached to the tool mounting portion 26 There is a proportional relationship with the amount of movement (correction amount) in the radial direction. Therefore, in particular, the effect of simplifying the control by the NC program at once can be obtained. Moreover, the first rack member 50A and the second rack member 50B are not affected by the mutual operation of the first one-way clutch 58A and the second one-way clutch 58B, and the rotary shaft member 46 is moved in the first rotation direction and in the first rotation direction. It can be rotated independently in the second rotation direction. Therefore, the effect that the radial adjustment work of the tool mounting portion 26 can be easily and surely performed can be obtained.

Further, the adjusting device 42 for correcting the position of the tool mounting portion 26 in the radial direction employs a rack and pinion structure (first rack member 50A and first pinion member 48A, second rack member 50B and second pinion member 48B). ing. As a result, as compared with the case of using, for example, a ratchet claw structure as the adjusting device 42, it is possible to maintain a desired operation function reliably and stably, and the position correction process can be efficiently performed. Therefore, a tool attached to the tool holder 20, for example, a boring bar 28, can be easily and accurately corrected in the radial direction of the tool holder 20 on a micron order.

Further, as shown in FIG. 5, in the tool holder 20, the first sliding hole portion 60a and the second sliding hole portion 60b are formed in parallel with each other with the rotary shaft member 46 interposed therebetween, and the first sliding hole portion 60b is formed. A first spring 72a and a second spring 72b are arranged at the bottom of the sliding hole portion 60a and the bottom of the second sliding hole portion 60b. Therefore, when the pressure on the first rack member 50A or the pressure on the second rack member 50B is released, the first rack member 50A and the second rack member 50B are subjected to the first spring 72a and the second spring 72b. It is surely returned to the original position through the elastic force of.

At that time, the first key groove 68a extending in the advancing / retreating direction of the first rack member 50A is formed on the outer peripheral portion of the first rack member 50A, while the outer peripheral portion of the second rack member 50B is formed with the first key groove 68a. A second key groove 68b extending in the advancing / retreating direction of the second rack member 50B is formed. On the other hand, the main body housing 24 has a first key member 70a inserted into the first key groove 68a to regulate the rotation and popping out of the first rack member 50A, and a second rack member 50B inserted into the second key groove 68b. A second key member 70b, which regulates the rotation and popping out of the key member 70b, is provided. Therefore, the first rack member 50A and the second rack member 50B are surely returned to the specified original positions while being held in the desired postures.

Further, the main body housing 24 has a first rotation stop member that regulates the rotation of the first pinion member 48A at a position where the first rack gear 66a and the first pinion member 48A are disengaged, for example, a first ball. A plunger 74a is provided. The main body housing 24 has a second rotation stopper member that regulates the rotation of the second pinion member 48B at a position where the second rack gear 66b and the second pinion member 48B are disengaged, for example, a second ball plunger 74b. Is provided. As a result, the first pinion member 48A and the second pinion member 48B do not rotate unnecessarily during processing and use, and the relative positional relationship with the first rack member 50A and the second rack member 50B is reliably maintained. Becomes possible.

Furthermore, as shown in FIG. 2, a pressurization spring 40 that presses the engaging portion 38 of the tool mounting portion 26 against the inclined surface 44a of the operating member 44 is arranged in the main body housing 24. Therefore, the contact portion 38a provided on the engaging portion 38 can always maintain a stable contact state with respect to the inclined surface 44a, and the axial movement of the operating member 44 can be controlled by the inclination angle of the inclined surface 44a. The correction operation of the bowling bar 28 is performed with high accuracy by accurately converting to the operation of.

Further, as shown in FIG. 3, a pair of dovetail grooves 30a and 30b are formed on the tip surface 24e of the main body housing 24, while the dovetail grooves 30a and 30b are formed on the end portion 26a of the tool mounting portion 26. A pair of protrusions 32a and 32b to be fitted are formed. The dovetail grooves 30a and 30b and the protrusions 32a and 32b are formed so as to extend in the moving direction of the tool mounting portion 26 (in the direction of arrow R in FIG. 4). Therefore, the tool mounting portion 26 can move smoothly along the radial direction.

Moreover, as shown in FIGS. 3 and 4, the sliding portion provided with the one dovetail groove 30a is an elastically deformed portion due to the formation of the slit 34 extending along the one dovetail groove 30a. It constitutes 36. As a result, even if the joint surface is worn due to sliding, the generation of gaps due to wear can be reliably prevented within a predetermined range under the pressing action of the elastically deformed portion 36, and durability can be easily improved. It is planned. Although not shown, the elastic deformation portion 36 is deformed to the expansion side in advance by using a tool or the like, and after inserting the tool attachment portion 26, the expansion force is removed to bring the elastic deformation portion 36 to the tool attachment portion 26 side. Pressurization by elastic reaction force can be applied.

FIG. 9 is an explanatory cross-sectional view of a main part of a tool holder 92 provided in a machine tool 90 constituting a work machine with a position correction function according to a second embodiment of the present invention. The same components as the tool holder 20 of the machine tool 10 according to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The main body housing 94 constituting the tool holder 92 is provided with a plurality of screw members 96 for pressing the elastically deformed portion 36 against one of the protruding portions 32a. The tip of the threaded portion 96 projects into the slit 34 and is arranged in contact with the protruding portion 32a.

In the second embodiment configured in this way, the elastically deformed portion 36 is pressed and held by the plurality of screw members 96, so that a give structure can be formed. Therefore, it is possible to effectively suppress the occurrence of backlash in the tool attachment portion 26.

10, 90 ... Machine tool 14 ... Spindle housing 16 ... Spindle 20, 92 ... Tool holder 24 ... Main body housing 26 ... Tool mounting part 28 ... Boring bar 30a, 30b ... Dovetail groove 32a, 32b ... Protrusion part 36 ... Elastic deformation part 38 ... Engaging portion 38a ... Contact portion 40 ... Pressurizing spring 42 ... Adjusting device 44 ... Acting member 46 ... Rotating shaft member 48A, 48B ... Pinion member 50A, 50B ... Rack member 58A, 58B ... One-way clutch 60a, 60b ... Sliding Holes 72a, 72b ... Spring 74a, 74b ... Ball plunger 76 ... Operation mechanism

Claims (10)

A tool holder that can rotate integrally with the spindle,
At the tip of the tool holder opposite to the spindle, a tool mounting portion that is movably mounted in the radial direction intersecting the rotation axis direction of the tool holder and to which the tool is mounted,
An adjustment device built into the tool holder that corrects the position of the tool attachment portion in the radial direction.
With
The adjusting device includes an operating member that is inclined in the radial direction toward the rotation axis direction and has an inclined surface that abuts on the engaging portion of the tool mounting portion.
A rotating shaft member that extends in the direction of the rotating shaft and one end of which is screwed into the operating member to rotate so that the operating member moves back and forth in the direction of the rotating shaft.
A first pinion member provided on the outer periphery of the other end of the rotating shaft member and rotating integrally with the rotating shaft member only in the first rotation direction via the first one-way clutch.
A second pinion member provided on the outer periphery of the other end of the rotating shaft member and rotating integrally with the rotating shaft member only in the second rotating direction opposite to the first rotating direction via the second one-way clutch. ,
The first pinion member is integrally arranged with the rotation shaft member by engaging with the first pinion member when an external load is applied to the first pinion member. A first rack member that is rotated in a direction while being disengaged from the first pinion member when no external load is applied.
The second pinion member is integrally arranged with the rotating shaft member so as to intersect with the second pinion member and engage with the second pinion member when the external load is applied. A second rack member that is rotated in the rotational direction while being disengaged from the second pinion member when no external load is applied.
A work machine with a position correction function, which is characterized by being equipped with. In the work machine according to claim 1, the tool holder has a first opening in which the first rack member is slidably arranged, and a first opening.
A second opening in which the second rack member is slidably arranged, and
Are formed parallel to each other with the rotating shaft member in between, and
A work machine with a position correction function, wherein one end of the first opening and one end of the second opening are open to the outside. In the work machine according to claim 2, a first elastic member that presses the first rack member toward one end side of the first opening is arranged at the other end of the first opening.
A work machine with a position correction function, characterized in that a second elastic member that presses the second rack member toward one end side of the second opening is arranged at the other end of the second opening. The work machine according to claim 3 includes an operation mechanism for operating the first rack member and the second rack member from the outside.
The operating mechanism includes a pressing member that is inserted into the one end side of the first opening and the one end side of the second opening to press the first rack member and the second first rack member. A work machine with a position correction function that is characterized by this. In the work machine according to claim 2 or 3, a first key groove extending in the advancing / retreating direction of the first rack member is formed on the outer peripheral portion of the first rack member.
A second key groove extending in the advancing / retreating direction of the second rack member is formed on the outer peripheral portion of the second rack member.
The tool holder includes a first key member that is inserted into the first key groove to regulate rotation and popping out of the first rack member.
A second key member that is inserted into the second key groove to regulate the rotation and popping out of the second rack member,
A work machine with a position correction function, which is characterized by being provided with. In the work machine according to any one of claims 1 to 5, the tool holder is provided with the first pinion member at a position where the first rack member and the first pinion member are disengaged from each other. The first detent member that regulates rotation,
At the position where the engagement between the second rack member and the second pinion member is released, the second rotation stopper member that regulates the rotation of the second pinion member and the second pinion member.
A work machine with a position correction function, which is characterized by being provided with. In the work mechanism according to any one of claims 1 to 6, an elastic member that presses the engaging portion of the tool mounting portion against the inclined surface of the operating member is arranged in the tool holder. A work machine with a position correction function, which is characterized by being present. In the work mechanism according to claim 1, a pair of dovetail grooves and a pair of protrusions that fit into the dovetail grooves are formed at the tip end portion of the tool holder and the end portion of the tool attachment portion on the tool holder side. A work machine with a position correction function, which is formed so as to extend in the moving direction of the tool mounting portion. In the work mechanism according to claim 8, the sliding portion provided with one dovetail groove constitutes an elastically deformed portion by forming a slit extending along the one dovetail groove. A work machine with a position correction function that features. The work machine according to claim 9, wherein the tool holder is provided with a screw member that presses the elastically deformed portion against one of the protrusions.

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