JPH0839313A - Boring tool holding device with guide bush - Google Patents

Abstract

PURPOSE:To provide a boring tool holding device with guide bush in which a boring tool and a guide bush for guiding it can be attached to and detached from a holding device. CONSTITUTION:In a bush holding device, the engaging pin of a lever energized by a spring is fitted into the engaging hole of a guide bush 54 to hold the guide bush 54, and in a reamer holding device, a collet chuck 110 holds a reamer 52 by the energization of a disc spring 166. When the reamer 52 and the guide bush 54 are released, a cutting tool moving shaft 36 is retreated, a reamer moving shaft 100 is then moved forward from the position where a drive block 150 makes contact with a stopper block 182, the energizing force of the disc spring 166 is released to release the reamer 52, and the lever is rotated to release the guide bush 54. When the reamer 52 and the guide bush 54 are held, the cutting tool moving shaft 35 is advanced to hold the reamer 52, and the reamer moving shaft 100 is then retreated to hold the guide bush 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding a hole drilling tool with a guide bush, and more particularly to replacement of a guide bush and a hole drilling tool.

[0002]

2. Description of the Related Art For drilling performed by rotating a drilling tool, for example, drilling, finishing the inner peripheral surface of a hole with a reamer, chamfering with a bite, counter boring, etc. There is additional processing to do. When performing such drilling, a guide bush may be fitted to the outside of the drilling tool to guide the drilling tool.

For example, as in the case where the valve stem hole of the valve seat of the cylinder head, which is a component of the engine, is finished by a reamer, the hole has a large diameter portion and a small diameter portion deep inside the large diameter portion. When the part to be finished by the reamer is a small diameter part at the back, insert the guide bush fixed to the holding device body of the hole drilling tool holding device into the large diameter part of the hole and guide the reamer to the vicinity of the work position. Then, the bending of the reamer can be suppressed and the processing accuracy can be improved.

Conventionally, the guide bush is detachably fixed to the holding device main body by a screw member such as a bolt, and is attached and detached by the operation of the screw member by an operator. Also,
The reamer is releasably held by a reamer holding device that is axially movable relative to the holding device body, and is switched between a holding state and a releasing state by a switching device having a power source such as a hydraulic cylinder. It was like this.

When the reamer is attached to or removed from the holding device main body, after the reamer holding device holds the reamer released by the switching device, the operator pulls out the reamer from the holding device main body, and when the reamer is attached, the reamer is mounted by the operator. The reamer holding device is held in the holding device body by switching the reamer holding device to the holding state by the switching device. Also, the guide bush is not attached and removed as often as the reamer, but when it is necessary to attach and detach, the worker loosens the screw member and pulls out the guide bush from the holding device body, and when installing it, the guide bush is held. After fitting in, fix the screw member by tightening it.

[0006]

However, when fixing and releasing the guide bush to the main body of the holding device as described above is performed by the operation of the screw member by the operator, the work takes time, and the reamer and the guide are used. There is a problem that it is difficult to automate the work of attaching and detaching the bush together. For example, when the work changes and the diameter of the valve stem hole to be finished by the reamer changes, it is necessary to replace the reamer with a diameter corresponding to the diameter of the valve stem hole. In this case, if a common drilling tool holding device is to hold a plurality of types of reamers having different diameters, it is necessary to replace the guide bush with one having an inner diameter corresponding to the outer diameter of the reamer. However, since it takes time for the worker to fix and release the guide bush with respect to the holding device main body, it takes time to replace it, especially when the diameter of the reamer needs to be changed frequently, the operating rate of the hole drilling device decreases. In addition, it hinders automation of exchange. It is an object of the inventions of claims 1 to 4 to provide a hole machining tool holding device with a guide bush capable of rapidly holding and releasing both the guide bush and the hole machining tool by power. .

[0007]

In order to solve the above-mentioned problems, a guide bushing hole drilling tool holding device according to a first aspect of the present invention is fixed to (a) a main shaft rotatable about one axis. A holding device main body; (b) a bush holding device which is provided so as to be axially immovable relative to the holding device main body and holds the guide bush releasably; and (c) an axial direction with respect to the holding device main body. It is provided so that it can move relative to
It includes a hole drilling tool holding device that holds the hole drilling tool in a releasable manner, and (d) a switching device that is driven by a power drive device and that switches the bush holding device and the hole drilling tool holding device between a released state and a held state. Is configured as follows.

The bush holding device may be provided so as to be immovable in the axial direction relative to the holding device main body, and may be provided in the holding device main body or in the main shaft housing that rotatably supports the main shaft. In the former case, the guide bush will rotate along with the reamer to guide the reamer, and in the latter case, the guide bush will not rotate and will guide while allowing the reamer to rotate.

In the hole drilling tool holding device according to the second aspect of the present invention, the switching device holds the hole drilling tool holding device and moves in the axial direction to move the hole drilling tool in the axial direction. Relative to a bush releasing movement shaft that switches the bush holding device between a holding state and a releasing state in one end region of the axial movement range, and the bush releasing movement shaft that is provided so as to be movable in the axial direction. The hole drilling tool holding device is configured to include a hole drilling tool release moving shaft that switches the hole drilling tool holding device between a holding state and a released state by movement, and the hole drilling tool holding devices for both the moving shafts are held and released. The relative movement amount for switching to and is made larger than the movement amount of the bush releasing movement shaft for switching the bush holding device between the holding state and the released state.

A hole drilling tool holding device according to a third aspect of the present invention is provided in each of the guide bush and the hole drilling tool, and defines a relative movement limit of the guide bush and the hole drilling tool in at least one direction. Relative to having the engaging portion and the second engaging portion, the first engaging portion and the second engaging portion are provided at positions that allow a change in the amount of protrusion from the guide bush of the tip end portion of the hole drilling tool. It is configured to include a movement limit defining device.

In the hole drilling tool holding device according to the invention of claim 4, the first engaging portion is formed radially inward on the inner peripheral surface of the guide bush, while the second engaging portion is holed. The outer peripheral surface of the tool is formed so as to be engageable with the first engaging portion in a radially outward direction and in a direction from the tip end side to the base end side of the hole drilling tool.

[0012]

In the hole holding tool holding device with a guide bush according to the first aspect of the present invention, the hole forming tool held by the hole forming tool holding device is rotated by the main shaft while being axially opposed to the holding device main body. Moved and processed. At this time, since the hole drilling tool is guided by the guide bush, the bending is suppressed. The bush holding device and the hole drilling tool holding device, which respectively hold the guide bush and the hole drilling tool, are switched between the holding state and the released state by the switching device driven by the power drive device. Both are held and released quickly.

In the hole forming tool holding device with a guide bush according to the second aspect of the present invention, the hole forming tool holding device is held, and the hole forming tool is moved in the axial direction through the hole forming tool holding device. The tool moving axis also serves as the bush releasing moving axis. Then, the holding of the hole drilling tool by the hole drilling tool holding device is released by the relative movement of the hole drilling tool releasing moving shaft and the bush releasing moving shaft. Moreover, since the relative movement amount of the two shafts is larger than the movement amount of the bush releasing movement shaft for switching the bush holding device between the holding state and the released state, the guide bush and the hole drilling tool cannot be released. The holes can be held simultaneously and held in the order of the drilling tool and the guide bush. From the position (referred to as a holding position) in which the hole drilling tool release moving shaft holds the hole drilling tool holding device to the release position (referred to as a releasing position), the state of the hole drilling tool holding device is switched. Hole moving tool for moving the bushing-releasing shaft relative to the bushing-releasing moving shaft and the bushing-releasing device for switching the state of the bushing holding device. If the bush holding device is released by moving the moving shaft to the release position, the hole drilling tool holding device is released at the same time, and after moving the drilling tool release moving shaft to the holding position, the bushing is released. When the movable shaft is moved to the holding position, the hole drilling tool holding device is first put into the holding state, and then the bush holding device is put into the holding state.

The moving shaft for releasing the drilling tool is made immovable relative to the main body of the holding device (in other words, the moving shaft for releasing the drilling tool is omitted), and the bush holding device is operated by moving only the moving shaft for releasing the bush. It is also possible to switch both the hole drilling tool holding device between the holding state and the released state. In this case, whether the guide bush and the hole drilling tool are both held and released at the same time, Both will be at different times. If the movement amount of the bush releasing movement shaft for switching the state of the hole drilling tool holding device and the movement amount of the bush holding device for changing the state of the bushing holding device are made equal, the guide bush and the hole drilling tool are held and released. At the same time, if the movement amount for changing the state of the hole drilling tool holding device is made larger than the movement amount for changing the state of the bush holding device, the guide bush and the hole drilling tool are released in this order, and the hole drilling tool and the guide Since the bushes are held in this order, if the magnitudes of the movement amount for switching the state of the hole drilling tool holding device and the movement amount for changing the state of the bush holding device are reversed, the order of release and holding will be The opposite is true.

Further, by providing both the moving shaft for releasing the drilling tool and the moving shaft for releasing the bush, only the drilling tool holding device is switched between the holding state and the released state, and the bush holding device and the drilling work are performed. Both the tool holding device and the tool holding device can be switched between a holding state and a releasing state. However, even in this case, the relative amount of movement of both moving shafts for switching the hole drilling tool holding device between the holding state and the released state is changed to the bush releasing movement for switching the bush holding device between the held state and the released state. If not larger than the movement amount of the shaft, like the hole holding tool holding device with a guide bush according to claim 2, release is performed at the same time as the hole forming tool and the guide bush, and holding is performed so that the hole forming tool comes first. It is not possible.

In the hole drilling tool holding apparatus according to the third aspect of the present invention, the limit of relative movement of the hole drilling tool with respect to the guide bush in at least one direction is determined by the engagement between the first engaging portion and the second engaging portion. Stipulated.

When the relative movement of which the limit is defined is relative movement in the direction in which the hole drilling tool is inserted into the guide bush from the base end side, the first engaging portion of the guide bush has the first engaging portion of the guide bush. Located in the upstream side of the second engaging portion of the hole drilling tool in the direction of removal from the bush holding device, the first engaging portion engages with the second engaging portion when the guide bush is removed, and the hole is drilled. The tool is pulled out of the drilling tool holding device integrally with the guide bush. In this aspect, both the guide bush and the drilling tool can be removed, or only the drilling tool can be removed while leaving the guide bush. This aspect is the invention of claim 4.

Further, when the relative movement direction in which the above limit is defined is the direction in which the hole drilling tool is pulled out from the guide bush toward the tip side, the second engaging portion of the hole drilling tool is guided in the pulling direction. Located on the upstream side of the first engaging portion of the bush, the second engaging portion engages with the first engaging portion when the hole drilling tool is pulled out from the hole drilling tool holding device, and the guide bush has the hole drilling tool. It is removed with.

Further, in the case where both limits of relative movement of the hole drilling tool from the base end side into the guide bushing and from the direction toward which it is pulled out to the tip end side are both specified,
One of the first engaging part and the second engaging part is on the other side of the other in the axial direction, the hole drilling tool cannot be pulled out from the guide bush, and either the hole drilling tool or the guide bush can be pulled out. However, the hole drilling tool and the guide bush can be integrally removed from the holding device.

[0020]

According to the present invention, the guide bush and the hole drilling tool can be held and released by the power drive device, and the guide bush and the hole drilling tool can be easily and quickly attached and detached. . In addition, the effect of facilitating automation such as replacement of the guide bush and the drilling tool can be obtained.

If the bush holding device and the hole drilling tool holding device are switched in state by the movement of the bush releasing moving shaft and the hole drilling tool releasing moving shaft, the switching device can be used. The effect that it is easy to arrange on the main shaft is obtained. Further, by holding the hole drilling tool holding device on the bush releasing moving shaft, the bush releasing moving shaft and the hole drilling tool moving shaft for moving the hole drilling tool for hole drilling can be combined, The effect that the structure of the hole drilling tool holding device with a guide bush can be simplified is obtained. Further, if the state change of the hole drilling tool holding device is performed by the relative movement of the hole drilling tool releasing moving shaft and the bush releasing moving shaft, the bush releasing moving shaft for changing the state of the bush holding device is The movement can be used as a movement for changing the state of the hole drilling tool holding device, and the amount of movement of the hole drilling tool release moving shaft can be reduced. Further, the relative movement between the hole-machining tool releasing moving shaft and the bush-releasing moving shaft for switching the state of the hole-machining tool holding device is made larger than the moving amount of the bush-releasing moving shaft for changing the state of the bush holding device. if,
The guide bush and the drilling tool can be released at the same time, and the holding can be carried out in the order of the drilling tool and the guide bush. If they are released at the same time, the guide bush and the hole drilling tool can be quickly removed, and if the hole drilling tool and the guide bush are held in this order, the hole drilling tool holding device holds the hole drilling tool. After that, the bush release moving shaft moves, and the hole drilling tool also moves in the axial direction with the movement, so the guide bush fitted on the outside also moves due to frictional force, and surely reaches the specified depth. It is drawn in and held by the bush holding device.

According to the third aspect of the present invention, at least one of attachment and detachment of the guide bush and the hole drilling tool can be performed only by gripping one of the guide bush and the hole drilling tool. The attachment / detachment work is simpler than the case of attaching and detaching by gripping and.
Further, when automatically attaching and detaching the hole drilling tool and the guide bush for automatic replacement, etc., the attaching / detaching tool can be engaged with only one of the guide bush and the hole drilling tool. The configuration can be simplified.

According to the invention of claim 4, by pulling out the guide bush, the hole drilling tool can also be pulled out, and the pulling out becomes easy. Further, when the attachment / detachment of the guide bush and the hole drilling tool is automated, the attachment / detachment tool can be engaged with the guide bush. Engagement with the guide bush (for example, gripping the guide bush) is easier than engagement with the hole drilling tool having a cutting edge, and the structure of the attachment / detachment tool can be simplified.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be listed below, and related explanations will be given if necessary. (1) The hole drilling tool has a large-diameter blade portion that fits into the bush without a gap, and a shank that has a smaller diameter than the blade portion and that fits with a gap between the guide bush and the blade. The stepped surface between the shank and the shank constitutes a second engaging portion that projects radially outward from the outer peripheral surface of the hole drilling tool, and is formed between the large diameter hole and the small diameter hole of the guide bush. The hole forming device with a guide bush according to claim 4, wherein the stepped surface that constitutes the first engaging portion projects inward in the radial direction from the inner peripheral surface of the guide bush.

In the apparatus of this aspect, when the guide bush is pulled out from the holding device main body, the stepped surface of the guide bush as the first engaging portion becomes the stepped surface of the hole drilling tool as the second engaging portion. Once engaged, the drilling tool is pulled out of the holding device together with the guide bush. The drilling tool is often provided with a blade portion and a shank having a diameter smaller than that of the blade portion, so that the second engaging portion can be easily obtained. Further, when the guide bush is pulled out, the guide bush and the hole drilling tool come into contact with each other on the stepped surface, and the force is uniformly applied to the entire circumference of the hole drilling tool, so that the hole drilling tool is likely to be twisted. Therefore, the blade can be easily pulled out together with the guide bush, and there is no possibility that a large load is applied to a part of the blade and the blade is damaged.

(2) Each of the inventions and modes (1) according to claims 1 to 4, wherein the hole drilling tool holding device is provided with a movable engaging portion for engaging and disengaging the hole drilling tool by movement in the radial direction. The hole-machining tool holding device with an id bush according to any one of 1.

(3) Any one of the inventions, modes (1) and (2) of claims 1 to 4, wherein the bush holding device is provided with a movable engaging portion that engages with and disengages from the bush by movement in the radial direction. The hole drilling tool holding device with a guide bush according to any one of the above.

In the apparatus of these aspects, the hole drilling tool or the guide bush is held and released by the movement of the movable engaging portion in the radial direction. A mode in which the hole drilling tool or the guide bush can be reliably held, and a plurality of movable engaging portions are provided in axial symmetry with respect to the center line of the hole drilling tool (3 is particularly desirable) is particularly reliable.

(4) Each of the inventions and modes (claims 1 to 3), wherein the hole drilling tool holding device includes a collet chuck for holding and releasing the hole drilling tool by reducing or expanding the diameter of the hole drilling tool in the radial direction. 1) A hole drilling tool holding device with a guide bush according to any one of 1) to (3).

(5) The invention according to any one of claims 1 to 4, wherein the bush holding device includes a collet chuck for holding and releasing the bush by reducing and expanding the diameter in the radial direction of the bush.
A hole-machining tool holding device with a guide bush according to any one of to (4).

In the apparatus of these aspects, the hole drilling tool or the guide bush is held and released by reducing and expanding the diameter of the collet chuck. According to the collet chuck, the hole drilling tool and the guide bush can be held over the entire circumference and can be widely held in the axial direction, so that the hole drilling tool and the guide bush can be firmly held, and the holding device is also provided. Can be made compact.

(6) The collet chuck is provided with tapered outer peripheral surfaces at both ends in the axial direction and has collet grooves each extending alternately from both end surfaces in the axial direction to the vicinity of the other end surface, and the collet. 5. A hole machining tool holding device with a guide bush according to aspect (4) or (5), including a pair of collet receivers each having a tapered inner peripheral surface corresponding to each tapered outer peripheral surface.

In the apparatus of this aspect, since both ends of the collet in the axial direction are reduced and expanded in diameter to hold and release the hole drilling tool or the guide bush, the hole drilling tool or the guide bush is held more firmly. In addition, the occurrence of the tilt is favorably prevented.

(7) The bush holding device has a fitting portion fitted into the guide bush of the holding device main body, an engagement hole provided in the guide bush, and a direction in which the holding device main body intersects the axis of the guide bush. And a disengagement device for disengaging the engaging projection into and out of the engaging hole by the movement of the bush releasing movement shaft. The hole-machining tool holding device with a guide bush according to the aspect (3), including:

In the apparatus of this aspect, when the bush is released, the bush releasing movement shaft is moved so that the fitting / removing device disengages the engaging projection from the engaging hole. When the bush is held, the bush releasing movement shaft is moved in the direction opposite to that when the bush is released, the fitting / removing device fits the engaging projections into the engaging holes, and the engaging projections engage with the engaging holes to guide the engagement. The bush is prevented from coming off from the fitting portion, and the bush is held.

(8) The engaging hole of the bush holding device is an engaging hole formed at least in the outer peripheral surface of the bush and formed in the radial direction, and the engaging projection is provided on the holding device main body at a right angle to the axis of the bush. The lever is mounted on a lever rotatably mounted around the axis, and the engaging / disengaging device urges the lever in the direction in which the engaging projection fits into the engaging hole and the bush releasing movement. The guide bushing hole drilling tool holding according to the aspect (7), having a cam surface provided on the shaft for rotating the lever in the direction in which the engaging projection is disengaged from the engaging hole against the urging force of the urging means. apparatus.

In the apparatus of this aspect, when the guide bush is held, the cam surface of the bush releasing movement shaft is separated from the lever, and the lever is urged by the urging means so that the engaging projection fits into the engaging hole. The guide bush is prevented from coming off the holding device body.
When the guide bush is released, the cam surface engages with the lever due to the movement of the bush releasing movement shaft, and the engaging projection is rotated in the direction to separate from the engaging hole against the urging force of the urging means and held. To release. In addition, at the time of holding, the bush release moving shaft is moved in the direction opposite to that at the time of release, so that the cam surface is disengaged from the lever, the lever is urged by the urging means, and the engaging projection is fitted in the engaging hole. Hold the bush.

The bush holding device of this aspect does not require a member for covering the entire circumference of the guide bush unlike the collet chuck, so that, for example, as in the embodiments described later,
A portion of the holding device body where the bush holding device is not provided can be used as an installation space for another processing tool.

(9) The engaging hole of the bush holding device is an engaging recess opening on the outer peripheral surface of the guide bush, and the movable engaging portion is fitted to the guide bush so as to be relatively movable in the axial direction. A spherical member that is fitted into a through hole formed in the peripheral wall of the sleeve, is longer than the thickness of the peripheral wall, and has partial spherical surfaces at both ends in the direction of the center line of the through hole. And a first slanted surface formed on at least one end surface of the fitting recess, the fitting recess being formed on the inner peripheral surface thereof so that the spherical member can be fitted therein. A second inclined surface formed on an upstream end surface of the engaging recess portion of the guide bush in the direction in which the guide bush is pulled out from the main shaft, and the drive sleeve includes the second inclined surface formed by the bush releasing movement shaft. Manner to be moved from a state that is located on one side of the member to a state located on the other side of (7)
Hole drilling tool holding device with guide bush described in.

In the apparatus of this aspect, when the guide bush is held, the drive sleeve is in a state where the first inclined surface of the fitting recess is located on one side of the spherical member, and the spherical member continues to the first inclined surface of the drive sleeve. The guide bush is held by being pushed by the cylindrical surface and fitted into the engaging recess of the guide bush. At the time of holding and releasing, the drive sleeve is moved, and the guide bush is pulled out with the fitting recess corresponding to the spherical member. At this time, the second inclined surface formed in the engaging concave portion of the guide bush comes into contact with the partial spherical surface of the spherical member and pushes the spherical member toward the fitting concave portion of the drive sleeve, whereby the holding of the guide bush is released, and the guide bush is released. Can be pulled out. Further, when the guide bush is held, the guide bush is fitted to the holding sleeve in the released state so that the engagement recess corresponds to the spherical member. In this state, the drive sleeve is moved so that the first inclined surface is located on the other side of the spherical member. As a result, the first inclined surface of the fitting recess engages with the partial spherical surface of the spherical member and moves to the engagement recess side of the guide bush, and the cylindrical surface following the first inclined surface engages with the spherical member. Keeps fitted in the engaging recess. The spherical member may be one in which both ends of the member having a circular cross section form a partial spherical surface, or may be a sphere. Also, the moving direction of the drive sleeve is
The moving direction when releasing the guide bush may be the same as the pulling direction of the guide bush from the holding sleeve, and the moving direction when holding may be the same as the inserting direction of the guide bush into the holding device body, or vice versa. Good.

(10) A hole drilling tool for carrying out hole drilling on a workpiece is provided, in which a moving shaft for releasing a hole drilling tool is provided separately from the hole drilling tool in the holding device main body so as to be movable relative to the holding device main body. The hole bushing tool holding device with a guide bush according to any one of aspects (1) to (9) of the invention of claim 2, which is a moving shaft to be moved.

In the apparatus of this aspect, the moving member for moving the hole drilling tool different from the hole drilling tool guided by the guide bush is moved to hold and release the hole drilling tool guided by the guide bush. Is done,
The moving device can be shared, and the hole drilling tool holding device can be configured easily and inexpensively.

(11) An engaging projection provided on one of the guide bush and the hole drilling tool so as to extend in the radial direction,
A hole drilling tool phase which is provided on the other side and has an engagement groove with which the engagement projection is engaged, and which determines a relative phase of the hole drilling tool with respect to the guide bush by engagement of the engagement projection and the engagement groove. A rotation transmitting device having a determining device, a rotation transmitting part provided in the hole drilling tool holding device, and a rotation transmitted part provided in the hole drilling tool and having a non-circular cross section to which rotation is transmitted from the rotation transmitting part. A hole holding tool holding device with a guide bush according to any one of claims 1 to 4 and each of aspects (1) to (10).

In the apparatus of this aspect, the relative phase of the hole drilling tool with respect to the guide bush is determined by the hole drilling tool phasing device. Therefore, if the phase of the guide bush with respect to the holding device body is determined, the hole drilling tool The phase with respect to the main axis is determined. Further, since the relative phase of the rotation transmitting part of the hole drilling tool holding device with respect to the main axis is also fixed, if the relative phase of the guide bush with respect to the holding device body is properly determined, the rotation transmission of the hole drilling tool is inevitably transmitted. The relative phase between the portion and the rotation transmitting portion of the hole drilling tool holding device is matched, and the two are engaged with each other as the hole drilling tool is inserted into the hole drilling tool holding device, and become in the rotation transmitting state. It is not necessary to independently determine the phase of the drilling tool with respect to the drilling tool holding device, and the drilling tool can be easily attached.

(12) A bush holding tool is included when the hole drilling tool phasing device of the aspects (11) and the rotation transmission device are included and the relative phases of the rotation transmission portion and the rotation transmitted portion of the rotation transmission device match. The hole holding tool holding device with a guide bush according to any one of aspects (7) to (9), in which the relative phases of the engagement protrusions of the device and the engagement holes of the guide bush match.

In the hole drilling tool holding device of this aspect, when the rotation transmitting device is set to the rotation transmitting state, it is ensured that the engaging hole and the engaging projection are in the relative phase in which they can engage with each other, and the guide bush and the hole. The machining tool can be easily held by the hole machining tool holder with the guide bush.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in which the inventions of claims 1 to 4 are applied to a reamer holding device with a guide bush will be described below in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes a hollow main shaft, which is supported by a housing 12 so as to be rotatable around its axis. The housing 12 is provided on a base (not shown) so as to be movable in a direction parallel to the main shaft rotation axis. The main shaft 10 is moved by the main shaft moving device 13 (see FIG. 15) so that the main shaft rotation axis And is rotated by the main shaft rotation drive device 14 (see FIG. 15).

A tool head 16 is attached to the tip of the spindle 10. The head body 18 of the tool head 16 has a substantially conical shape, and is fitted to the main shaft 12 at a fitting protrusion 20 having a circular cross section that is provided on the end face on the large diameter side, and the phase is determined by a pin (not shown). It is fixed by multiple bolts.

The head main body 18 is formed with two guide grooves 22 and 24, which are open to the outer peripheral surface and extend parallel to the generatrix of the cone, symmetrically with respect to the axis of the head main body 18. Each of the guide grooves 22 and 24 has a T-shaped cross section, and moving members 26 and 28 having T-shaped cross sections are slidably fitted therein. The bite 30 is fixed to the tip of the moving member 26, and functions as a tool holder. The other moving member 28 functions as a balance piece that maintains a dynamic balance during processing. These moving members 26, 2
Through holes 32, 34 are formed in each of the holes 8 so as to penetrate in a direction orthogonal to the moving direction and are inclined with respect to the main axis of rotation.

A tool moving shaft 36 is fitted in the main shaft 10 so as to be movable in a direction parallel to the main shaft rotation axis.
At the tip of the bite moving shaft 36, two driving members 38,
40 is fixed symmetrically with respect to the axis of the bite moving shaft 36. The free ends of the drive members 38 are projected from the bite moving shaft 36, and the tip ends thereof are inclined in a direction away from the axis of the bite moving shaft 36 to form through holes 32, 34 formed in the moving members 26, 28. Are fitted so that they can move relative to each other.

The bite moving shaft 36 has a cylindrical shape, and the bite moving device 44 is inserted into the female screw hole 42 formed at the rear end thereof.
The joint member (see FIG. 15) is screwed. When the cutting tool moving shaft 36 is moved by the cutting tool moving device 44, the moving members 26 and 28 are guided to the guide grooves 22 and 24 by the effect of the slope formed between the driving members 38 and 40 and the through holes 32 and 34. Are moved symmetrically with respect to each other in the directions inclined with respect to the axis of rotation of the main shaft. Drive members 38, 4
0 indicates the movement of the bite moving shaft 36 in the axial direction by the moving member 26,
The movement converting mechanism for converting the movement of the moving member 26, 28 into a movement converting mechanism is formed, and the combination of the movement of the moving members 26, 28 and the movement of the main shaft 10 causes the cutting tool 30 to move.
It can be moved in any direction within a plane including 8.

The bite 30 is for machining a tapered surface as a valve seat of an engine cylinder head,
Tapered surfaces having different angles are formed at three different positions of the valve seat in the axial direction. When the angle of the taper surface to be machined at this time is the same as the inclination angle of the moving members 24 and 26 with respect to the main shaft rotation axis, the main shaft 12 is not moved, and the machining is performed only by the movement of the moving members 26 and 28. The angle of the tapered surface that moves is the moving member 2
When the inclination angle is larger than 6, 28, the moving member 26,
The main shaft 12 is moved backward while 28 is moved, and when the main shaft 12 is small, the main shaft 12 is moved forward. In either case, the moving members 26 and 28 are moved symmetrically with respect to the axis of rotation of the main shaft so that dynamic balance is achieved.

A through hole 50 extending on the axis is formed in the head body 18, and a bush 54 into which a reamer 52 is fitted is fitted therein. As shown in FIG. 2, the reamer 52 has a blade portion 56 having a cutting blade, and a shank 58 having a circular cross section with a diameter smaller than that of the blade portion 56. Finish the stem hole. The cutting blade is not shown in the blade portion 56.

A notch 60 extending in the axial direction and reaching the end surface of the shank 58 is formed on the outer peripheral surface of the end portion of the shank 58 opposite to the blade portion 56, and an adjuster 62 is provided on the end surface of the shank 58. Are screwed together to adjust the length of the reamer 52. Also, the blade portion 5 of the shank 58
An engaging groove 64 having a V-shaped cross section extending in the axial direction and reaching the notch 60 is formed on the outer peripheral surface of the portion between the notch 6 and the notch 60.

On the outer peripheral surface of the guide bush 54, as shown in FIGS. 3 and 5, a radially outward flange portion 66 is formed near the tip. Guide bush 54
The inner diameter of the reamer 52 is slightly larger than the diameter of the blade portion 56 of the reamer 52, and has a length sufficient for the entire blade portion 56 of the reamer 52 to be accommodated in the guide bush 54.

Reamer 52 on the inner peripheral surface of the guide bush 54
An annular protrusion 74 having a diameter slightly larger than the diameter of the shank 58 is formed at a position where it does not interfere with the blade portion 56 when the entire blade portion 56 of the guide bush 54 is accommodated. It is a stepped hole with a large diameter hole and a small diameter hole. Further, as shown in FIGS. 3 and 4, an engaging protrusion 78 having a V-shaped cross section is formed on a portion of the annular protrusion 74 on the bush rear side. Further, an engagement hole 80 penetrating in the radial direction is formed at a position having a 90 degree phase difference with the engagement projection 78 on the peripheral wall of the rear end portion of the guide bush 54. The reamer 52 is fitted into the guide bush 54 from the shank 58 side, the engaging projection 78 is fitted in the engaging groove 64, and the phase with respect to the bush 58 is determined.
The notch 60 and the engagement protrusion 78 are in phase with each other.

The guide bush 54 is, as shown in FIG. 6, a bush holding device 8 provided in the head main body 18.
Held by two. In the head main body 18, a recess 84 that opens to the rear end surface of the head main body 18 is formed, and a lever 86 is provided by a shaft 88 so as to be rotatable around an axis line orthogonal to the main shaft rotation axis line. Lever 8
6 has a plate shape, and an engaging pin 9 is provided on the side surface on the spindle rotation axis side.
0 is projected. Further, the lever 86 has two springs 92, 94 as elastic members, which are a kind of biasing means, at two positions separated in a direction parallel to the rotation axis of the main shaft.
Thus, the engagement pin 90 is biased in a direction projecting into the through hole 50, and the engagement pin 90 is fitted into the engagement hole 80 of the guide bush 54 to be inserted into the through hole 50 of the guide bush 54.
To prevent you from leaving. Through hole 5 of head body 18
0, the engaging hole 80, the lever 86, the shaft 8
The guide bush holding device 82 is composed of a detachment prevention device including 8, the engaging pin 90, the springs 92 and 94, and the like.

Notches 96 for avoiding interference with the lever 86 are respectively formed at two positions diametrically separated from each other at the tip end portion of the cutting tool moving shaft 36. Cutout 9
Since 6 is formed in two places, when the head main body 18 is attached to the cutting tool moving shaft 36, the driving member 38,
When 40 is fitted into the through holes 32 and 34 of the moving members 26 and 28, the lever 86 of the bush holding device 82 is in phase with either one of the two notches 96.

A cylindrical reamer moving shaft 100 is fitted in the bite moving shaft 36 so as to be relatively movable in the axial direction. A joint member 102 is screwed onto the rear end of the reamer moving shaft 100 as shown in FIG. The reamer moving device 104 (see FIG. 15) is attached to the joint member 102.
The joint member is screwed to move the reamer moving shaft 100. As shown in FIG. 7, a bush releasing member 106 is screwed onto the tip of the reamer moving shaft 100. The bush release member 106 will be described later.

As shown in FIG. 7, the reamer 52 is held by a collet chuck 110 as a reamer holding device provided inside the reamer moving shaft 100. The collet chuck 110 includes a collet 112 and first and second collet receivers 114 and 116. Collet 1
As shown in FIG. 9, 12 is a large diameter portion 120 and a small diameter portion 12
10, 11 and 12, four slits 124 extending axially from the end surface on the large diameter portion 120 side to the vicinity of the end surface on the small diameter portion 122 side are formed at equal angular intervals. The four slits 1 extending from the end surface on the small diameter portion 122 side to the vicinity of the end surface on the large diameter portion side in the axial direction.
25 is formed at a position which is 45 degrees out of phase with the slit 124. Also, the large diameter portion 120 and the small diameter portion 1
The outer peripheral surfaces of the respective end portions of 22 are tapered outer peripheral surfaces 126 and 128 whose diameter gradually decreases toward the end surface side.

The first collet receiver 114 has a cylindrical shape,
As shown in FIG. 7, it has a straight hole 130 into which the small diameter portion 122 of the collet 112 is fitted and a tapered hole 132 having a tapered inner peripheral surface corresponding to the tapered outer peripheral surface 128. In addition, the second collet receiver 116 has a circular cross-sectional shape, and the shank 5 of the reamer 52 is provided at the center in the axial direction.
8 is formed, and a tapered hole 138 having a tapered inner peripheral surface corresponding to the tapered outer peripheral surface 126 is formed on one side of the fitting hole 136. A stepped hole 140 having a diameter larger than that of the fitting hole 136 is formed on the other side. An engaging projection 142 is provided on the inner peripheral surface of the fitting hole 136 on the stepped hole 140 side so as to engage with the notch 60 of the reamer 52.

First and second collet receivers 114 and 116
Is fitted in the reamer moving shaft 100 so as to be relatively movable in the axial direction, and the collet 112 has a small diameter portion 122 as shown in FIG.
At the straight hole 130 of the first collet receiver 114
The large diameter portion 120 is fitted into the tapered hole 138 of the second collet receiver 116. Also, collet 11
2 is biased toward the second collet receiver 116 side by a spring 146 arranged between the large diameter portion 1120 and the first collet receiver 114.

The end of the second collet receiver 116 on the side where the stepped hole 140 is formed is fitted to a drive block 150 fitted to the reamer moving shaft 100 so as to be relatively movable in the axial direction, as shown in FIG. Set screw 1
It is fixed by 48.

As shown in FIG. 13, the drive block 150 is separated in the diametrical direction of the reamer moving shaft 110 at the key portion 151 extending radially from both sides to the center portion fitted with the second collet receiver 116. The holes 152 and 154 formed at the respective positions are relatively movably fitted, and the pair of key grooves 156 and 158 formed on the bite moving shaft 36 are movably fitted to each other. Thereby, the rotation of the main shaft 10 is transmitted to the reamer moving shaft 100 via the head main body 18, the driving members 38 and 40, the bite moving shaft 36, and the drive block 150, and further, from the second collet receiver 116 to the engaging projection 142 and the notch. 60
It is transmitted to the reamer 52 by fitting with.

Further, the phase of the reamer moving shaft 100 with respect to the bite moving shaft 36 is determined. Second collet receiver 11
6 is engaged with the reamer moving shaft 100, the lever 86 and the engaging pin 90 held by the head main body 18 phased with respect to the bite moving shaft 36 are engaged with the engaging protrusions 14.
2 is 90 degrees out of phase, that is, the notch 60 of the reamer 52 whose phase is determined with respect to the guide bush 54.
And the guide bush 54 are engaged with each other so as to have the same relative phase as that of the engaging hole 80 of the guide bush 54. Therefore, the engagement pin 90 fits into the engagement hole 80 in a state in which the rotation is transmitted to the reamer 52 by the engagement between the engagement protrusion 142 and the notch 60,
The bush holding device 82 can be in a holding state.

Drive block 1 of reamer moving shaft 100
A disc spring 166 as an urging means supported by a spring retainer 164 is disposed between the portion where the 50 is fitted and the joint member 102.

The spring retainer 164 has a fitting portion 168 fitted to the reamer moving shaft 100 and a small-diameter guide portion 17 extending from both ends of the fitting portion 168.
0 and a stopper portion 172. The protruding end of the guide portion 170 is fitted to the joint member 102, and the fitting portion 1
The disc spring 16 is provided in a portion between the joint member 102 and the joint member 102.
6 is fitted. Further, the stopper portion 172 is fitted into the drive block 150 and is made to project into the stepped hole 140 of the second collet receiver 116.

Therefore, the urging force of the disc spring 166 is transmitted from the fitting portion 168 of the spring retainer 164 to the second collet receiver 116 via the drive block 150, so that both ends of the collet 112 are respectively the first and second collets. It is sandwiched by the receivers 114 and 116 to be reduced in diameter,
The reamer 52 is held by gripping. The collet 112, the first collet receiver 114, the second collet receiver 116, the disc spring 166 and the like constitute the collet chuck 110 as a reamer holding device.

The reamer 52 includes a through hole 170 (see FIG. 7) formed in the bush release member 106 and the collet 1.
It is held by the collet chuck 110 in a state of being fitted into the fitting hole 136 of the second collet receiver 116 through 12 and fitted into the stepped hole 140 and abutted against the stopper portion 172 of the spring retainer 164. .

The reamer 52 thus held by the collet chuck 110 is moved by the movement of the reamer moving shaft 100, and at the time of processing, it is shown at the forward end position shown by the solid line in FIG. 1 and by the chain double-dashed line. It is moved to and from the retracted end position. This movement is allowed by the drive block 150 moving in the keyways 156 and 158. The bush release member 10 screwed to the reamer moving shaft 100 with the reamer 52 positioned at the forward end position.
There is a gap between 6 and the head body 108, and it is possible to further advance the reamer moving shaft 100. The position when the reamer 52 of the reamer moving shaft 100 is moved to the advance end position during machining is referred to as the advance end position during machining.

As shown in FIG. 8, the bite moving shaft 36
Of the keyways 156, 1 at a position diametrically separated from the end where the drive block 150 of FIG.
Fitting holes 1 each having a bottom in a state of intersecting the tip of 58.
80 is formed, and the stopper block 182 is fitted and fixed. Part of the stopper block 182 is the keyway 1
The drive block 1 of the reamer moving shaft 100 that is projected into the inside of the reamer moving shaft 100 and is located in the machining forward end position when the cutting tool moving shaft 36 is in the forward end position shown in FIG.
It is located at a predetermined distance (9 mm in this embodiment) from 50.

The bush release member 106 will be described. As shown in FIG. 6, a cam surface 190, which is a tapered outer peripheral surface whose diameter gradually decreases toward the tip, is formed on the outer peripheral surface of the tip of the bush release member 106. This cam surface 190
When the reamer moving shaft 100 is located at the forward end position during machining, the reamer moving shaft 100 is located away from the lever 86 as shown in FIG. 6, and the lever 86 is engaged by the urging force of the springs 92, 92. It is allowed to fit 90 into the engaging hole 80 of the guide bush 54.

When the reamer moving shaft 100 is further advanced from the forward end position during machining, the cam surface 190 engages with the lever 86 and rotates against the biasing force of the springs 92 and 94, and the engaging pin 90. Is released from the engagement hole 80, and the holding of the guide bush 54 is released. Thus, the cam surface 190
The position of the reamer moving shaft 100 when the holding of the guide bush 54 is released by engaging the lever 86 with the lever 86 is referred to as a bush release position. In the present embodiment, the distance between the machining forward end position and the bush releasing position is 7 mm.

The reamer 52 and the guide bush 54 are
It is exchanged by the exchange device 200. Switching device 200
As shown in FIG. 1, has a reamer pushing device 202 and a bush pushing / pulling device 204. The reamer pushing device 202 has a reamer pushing member 208 provided so as to be movable in the axial direction. The reamer pushing member 208 has a cylindrical pushing portion 210, and the tip of the pushing portion 210 is chamfered to prevent the reamer 52 from being displaced when pushed. The reamer pushing member 208 is moved by the reamer pushing member moving device 212 (see FIG. 15).

The bush pushing / pulling-out device 204 has a bush gripping tool 214 as a detachable tool. As shown in FIG. 14, the bush gripping tool 214 includes a pair of gripping claws 216.
Have. These gripping claws 216 are openably and closably supported by a gripping tool body as a detachable tool body (not shown), and are opened and closed by a claw opening / closing device. Recesses 217 having a V-shaped cross section are formed on the surfaces of the lower ends of the grip claws 216 that face each other, and the two sloping surfaces of the recess 217 are formed on the grip linings made of rubber as elastic members. 218 is attached.

The bush gripper 214 is mounted on the guide bush 5 by the bush gripper lifting device 220 (see FIG. 15).
4 is approached and separated in the radial direction,
It is moved in a direction parallel to the axis of rotation of the main shaft by the bush gripper moving device 222 (see FIG. 15).

The reamer pushing device 202 and the bush pushing / pulling device 204 are moved by the exchanging device moving device 224 (see FIG. 15) and retracted to a position where they do not interfere with the machining during the machining, and the reamer 52 and the guide bush 54 are moved. Reamer 52 and guide bush 5 during replacement
4, the reamer pushing member 208 is moved to the exchange position where it is concentric with the main shaft 10.

This hole drilling apparatus is a control apparatus 2 shown in FIG.
Controlled by 30. The control device 230 has a CPU 23.
2, a computer 240 having a ROM 234, a RAM 236, and a bus 238 for connecting them. An input port 242 and an output port 244 are connected to the bus 238. The drive circuits 246, 248, 250, 252, 25 are connected to the output port 244.
Spindle moving device 1 via 4, 256, 258, 260
3, the main spindle rotation driving device 14, the bite moving device 44, the reamer moving device 104, the reamer pushing member moving device 212, the bush gripper lifting device 220, the bush gripper moving device 222, and the exchanging device moving device 224 are connected.

Next, the operation will be described. When processing, first
The cutting tool 30 processes a taper surface as a valve seat on the cylinder head. At this time, the reamer 52 is drawn into the guide bush 54 as shown in FIG. 1, and is advanced after the processing by the cutting tool 30 is completed, and the valve stem hole formed at the back of the valve seat is finished. . The reamer 52 is rotated by the rotation of the main shaft 10 and is moved forward by the movement of the reamer moving shaft 100 to perform processing.

When the size of the cylinder head changes and the diameter of the valve stem hole changes, the reamer 52 is replaced with one having a diameter corresponding to the diameter of the valve stem hole. At this time, the guide bush 54 has an outer diameter equal to the outer diameter of the guide bush 54 actually held by the head main body 18, and the inner diameter is replaced with a new one according to the diameter of the new reamer 52. A guide bush having a different wall thickness is used according to the diameter of the reamer 52, and a plurality of types of reamers 52 having different diameters are held by the reamer holding device with a guide bush.

At the time of replacement, the replacement device 200 is moved to the replacement position. Then, the bush gripping tool 214 is lowered to grip the portion of the guide bush 54 on the tip side of the flange portion 66. The grip lining 218 of the grip claw 216 of the bush grip 214 has a high friction coefficient, and the guide bush 54 is gripped by the bush grip 214 while reliably maintaining the phase determined with respect to the main shaft.

In this state, the bite moving shaft 36 and the reamer moving shaft 100 are moved to release the holding of the reamer 52 and the guide bush 54, respectively. At the time of replacement, the bite moving shaft 36 is at the forward end position and the reamer moving shaft 100 is at the forward end position during processing. First, the bite moving shaft 36 is retracted by 3.4 mm as shown in FIG.
The distance between the stopper block 182 and the drive block 150 is set to 5.6 mm.

In this state, the reamer moving shaft 100 is moved forward by 7 mm. As a result, the drive block 150 abuts on the stopper block 182. However, since the distance between the drive block 150 and the stopper block 182 becomes 5.6 mm due to the backward movement of the bite moving shaft 36, the drive block 150 is stopped by the stopper block 182. After contacting 182, the reamer moving shaft 100 advances 1.4 mm with respect to the drive block 150 while compressing the disc spring 166.
Therefore, the biasing force of the disc spring 166 is equal to that of the stopper block 1.
It is received by 82 and is not transmitted to the second collet receiver 116, the collet 112 can be expanded in diameter, and the holding of the reamer 52 by the collet chuck 110 is released.

When the reamer moving shaft 100 moves forward by 7 mm, the cam surface 190 of the bush releasing member 106 engages with the end portion of the lever 86 and rotates against the biasing force of the springs 92 and 94. As a result, the engagement pin 90 is pulled out from the engagement hole 80 of the guide bush 54, and the holding of the guide bush 54 and the holding of the reamer 52 are released almost at the same time.

Since the cutting tool 30 is machined, the cutting tool moving shaft 36 is moved backward to move the cutting tool 30 backward. At this time, the reamer moving shaft 100 is at the retracted end position and the stopper block 182 is driven by the drive lock 150.
The reamer 52 is not released from holding the reamer 52.

When the holding of the reamer 52 and the guide bush 54 by the collet chuck 110 and the bush holding device 82 is released in this way, the bush holding tool 214 is moved in the axial direction of the main shaft 10 and the guide bush 54 is moved to the head. It is pulled out from the main body 18. At this time, the annular protrusion 74 of the guide bush 54 is moved to the reamer 52.
Of the reamer 52 and the radially inwardly stepped surface of the guide bush 54 are engaged with each other so that the reamer 52 is engaged with the guide bush 54.
At the same time, the head body 18 is pulled out. The bush gripper 214 is moved in the axial direction until the entire reamer 52 is pulled out from the head main body 18, and is moved to a receiving device (not shown). After passing the guide bush 54 and the reamer 52 to the receiving device, a new machining is performed. To receive the guide bush 54 used for. The newly used guide bush 54 is fitted with the newly used reamer 52, and the relative phase with respect to the main shaft 10 is determined to be the same as that of the guide bush 54 separated from the main shaft 10.

The bush holding tool 214 is the guide bush 5.
4, the pair of gripping claws 216 grip the guide bush 54 while keeping the guide bush 54 in the above-described phase. Therefore, the guide bush 54 is inserted into the head main body 18 by the movement of the bush gripping tool 214 toward the main shaft 10, and in parallel with the insertion of the guide bush 54, the reamer 52 is passed through the head main body 18 by the reamer pushing member 208 to pass the collet chuck. It is inserted into 110, but at this time,
The notch 60 of the reamer 52 and the engagement protrusion 142 of the collet chuck 110 are in phase with each other, and the notch 60 and the engagement protrusion 14 are in phase.
2 and the engaging hole 80 formed in the peripheral wall of the guide bush 54 and the engaging pin 90 of the bush holding device are in phase with each other.

As shown in FIG. 17, the reamer 52 is pushed in until it comes into contact with the stopper portion 172 of the spring retainer 164, and the guide bush 54 is pushed in until the flange portion 66 comes into contact with the tip surface of the head body 18.

After being pushed in, the bite moving shaft 36 moves the reamer 52.
The same distance (3.4mm) that was retracted when holding and releasing the
) Can be advanced. As a result, as shown in FIG. 18, the stopper block 182 separates from the drive block 150, the biasing force of the disc spring 166 is transmitted to the second collet receiver 116, and the collet chuck 110 holds the reamer 52.

Subsequently, the reamer moving shaft 100 is retracted by the distance (7 mm) advanced when the guide bush 54 is released. As a result, as shown in FIG. 1, the cam surface 190 of the bush releasing member 106 is disengaged from the lever 86, the lever 86 is rotated by the urging force of the springs 92 and 94, and the engagement pin 90 engages with the guide bush 54. The bush holding device 82 is inserted into the hole 80, and the bush holding device 82 is held.

At the time of holding the reamer 52 and the guide bush 54, first, the reamer 52 is held and then the guide bush 54 is held. Therefore, the distance between the drive block 150 and the stopper block 182 is 9 mm.
Is provided. If the distance between the drive block 150 and the stopper block 182 is less than 7 mm, the reamer 52 and the guide bush 54 can be held and released only by moving the reamer moving shaft 100 by 7 mm. The reamer 52 and the guide bush 54 are both held and released at the same time. Therefore, a distance larger than 7 mm is provided between the drive block 150 and the stopper block 182 so that the reamer 52 and the guide bush 54 are held separately.

When both the reamer 52 and the guide bush 54 are held in this way, the reamer pushing member 2
08 is retracted, and the bush gripper 214 is opened and raised, and further, the exchange device 200
After being moved to the retracted position, processing is started.

The case where the reamer 52 and the guide bush 54 are both replaced has been described above.
It is also possible to exchange only. In this case, the bite moving shaft 36 is retracted 10.4 mm from the state shown in FIG. 1, the stopper block 182 is brought into contact with the drive block 150, receives the biasing force of the disc spring 166, and holds the reamer 52. It will be canceled. After that, the reamer 52 is grasped and pulled out by the bush grasping tool 214. An annular shape for engaging the blade portion 56 of the reamer 52 of the guide bush 54 so that the reamer 52 is pulled out together with the guide bush 54. The protrusion 74 is provided on the upstream side of the blade portion 56 in the reamer drawing direction.
Allow 2 drawers.

Further, the gripping claws 21 of the bush gripping tool 214
Since the rubber-made gripping lining 218 is attached to 6, the phase does not change even if the blade portion 56 of the reamer 52 is gripped by the bush gripping tool 214 in any phase. The blade portion 56 can be regarded as a polygonal prism, and depending on the relative phase with respect to the grip claw 216, the grip claw 216 is in a state in which a rotational moment is applied during gripping.
Therefore, if the friction coefficient between the grip claw 216 and the blade portion 56 is small, the reamer 52 may actually rotate and the phase may change, but if the grip lining 218 is provided, the blade portion 56 of the blade portion 56 may be changed. Cutting blade grip lining 21
The rotation of the reamer 52 is prevented by biting into the reamer 8. The same effect can be obtained by forming a large number of grooves parallel to the axial direction of the reamer 52 on the V groove surface forming the grip surface of the grip claw 216 instead of providing the grip lining 218. When the grip claw 216 grips the blade portion 56, it is desirable that the grip surface be provided with a rotation preventing means.

As is clear from the above description, in this embodiment, the reamer 52 is a hole drilling tool, the head main body 18 is a holding device main body, and the bite moving device 44 and the reamer moving device 104 are power driving devices. The bush releasing member 106 is attached to the reamer moving shaft 100 that constitutes the bush releasing moving shaft, and the bite moving shaft 36 that constitutes the hole machining tool releasing moving shaft constitutes the switching device. Further, the stopper block 182 and the drive block 150 prevent the relative movement between the reamer moving shaft 100 forming the bush releasing moving shaft and the bite moving shaft 36 forming the hole forming tool releasing shaft by a hole forming tool holding device. The transmission device is configured to transmit to the constituent collet chuck and switch it between the holding state and the releasing state.

In the above embodiment, the guide bush 54
The engaging pin 90 provided on the lever 86 is fitted into the engaging hole 80 to be held by the head main body 18, but in the embodiment shown in FIG. 19, a collet chuck is used as a bush holding device. 270 has been adopted.

A large-diameter fitting hole 276 is formed at the end of the through hole 50 into which the guide bush 54 of the head main body 18 is fitted and which faces the reamer moving shaft 100.
78 is fitted and is fixed to the head main body 18 by a screw 280. Fitting hole 27 of collet 278
A tapered outer peripheral surface 282 having a diameter gradually increasing toward the tip is formed at the end of the opening 6 on the opening side.

A collet receiver 284 is fitted between the collet 278 and the fitting hole 276. Collet receiver 2
The inner peripheral surface of the end portion of the fitting hole 276 on the opening side of the 84 is a tapered inner peripheral surface 286 corresponding to the tapered outer peripheral surface 282. The collet receiver 284 is biased by a disc spring 288 as an elastic member, and the tapered inner peripheral surface 282 is engaged with the tapered outer peripheral surface 282 of the collet 278.
The movement limit of the collet receiver 284 due to the bias of the disc spring 288 is the washer 289 and the C-shaped retaining ring 2 as the movement limit defining member attached near the opening of the fitting hole 276.
90. When the guide bush 54 is held, the collet receiver 284 is located away from the washer 289, and the collet 278 is contracted to hold the guide bush 54. The tip end surface of the bush release member 294 screwed into the tip end of the reamer moving shaft 292 is a flat surface perpendicular to the axis.

When the reamer moving shaft 292 is at the forward end position during processing, the bush releasing member 294 is separated from the collet receiver 282 as shown in FIG. At the time of releasing the holding of the reamer 52 and the guide bush 54, the bite moving shaft 296 is retracted, and then the reamer moving shaft 292 is advanced to move the collet receiver 284 against the biasing force of the disc spring 286, as in the above embodiment. And retreat. Thereby, the reamer 5 by the collet chuck 110
2 is released, and the collet chuck 27 is released.
The holding of the guide bush 54 by 0 is released.

In this embodiment, when the bush is released, the reamer moving shaft 292 needs only to be slightly retracted against the biasing force of the disc spring 284 by the bush releasing member 294 contacting the collet receiver 282. The distance between the forward end position and the holding release position of 292 during processing may be short.

When the reamer 52 and the guide bush 54 are held, the cutting tool moving shaft 296 is moved forward and then the reamer moving shaft 292 is moved backward. As a result, the bush release member 294 separates from the collet receiver 282, the tapered inner peripheral surface 284 is pressed against the tapered outer peripheral surface 282,
The collet 278 is reduced in diameter to hold the guide bush 54.

Further, in the embodiment shown in FIG. 20, the bush holding device 300 includes the ball 302 as a spherical member.
The guide bush 304 is held by being engaged with the guide bush 304. A large-diameter fitting hole 308 is formed in a portion of the through hole 50 formed in the head body 18 facing the reamer moving shaft 292, and a holding sleeve 310 is fitted therein and is fixed to the head body 18 by a screw 312. ing. Ball holding holes 312 penetrating in the radial direction are formed at a plurality of locations (preferably three locations) spaced apart in the diametrical direction of the holding sleeve 310, and the balls 302 are movable in the radial direction from the inner peripheral surface side. It is fitted so that it cannot come out. Further, an annular engagement recess 316 into which a part of the ball 302 can be fitted is formed on the outer peripheral surface of the guide bush 304. This engaging recess 316 has a triangular cross section, and the inclined surface on the upstream side in the guide bush withdrawing direction is the second inclined surface 3.
18 is composed.

A drive sleeve 320 is fitted between the holding sleeve 310 and the fitting hole 308 so as to be movable in the axial direction, and serves as an elastic member disposed between the holding sleeve 310 and the bottom surface of the fitting hole 308. Fitting hole 308 by spring 322
It is urged to get out of. The movement limit of the drive sleeve due to this biasing force is a washer 323 as a movement limit defining member attached near the opening of the fitting hole 308.
And a C-shaped retaining ring 324.

The ball 3 is provided on the inner peripheral surface of the drive sleeve 320.
Annular groove 326 as a receiving recess capable of receiving a part of 02.
Are formed. Both side surfaces of the annular groove 326 are respectively
The opening of the annular groove 326 is inclined with respect to the axis of the drive sleeve 320 so as to be larger than the bottom surface, and the inclined surface on the upstream side in the guide bush insertion direction constitutes the first inclined surface 328. .

When the reamer moving shaft 292 is at the forward end position during processing and the bush release member 294 is separated from the drive sleeve 320, the drive sleeve 320 is moved to the spring 3 position.
The first inclined surface 32 of the fitting recess 326 is biased by
8 is on the downstream side of the center of the ball 302 in the guide bush insertion direction, and the cylindrical surface of the inner peripheral surface of the drive sleeve 320 following the first inclined surface 328 engages with the ball 302 to engage the engaging recess 316 of the guide bush 304. Push it in,
The guide bush 54 is held.

When the holding of the reamer 52 and the guide bush 304 is released, the bite moving shaft 296 is moved backward and then the reamer moving shaft 292 is moved forward. As a result, the bush release member 294 resists the drive sleeve 320 against the biasing force of the spring 322 and the annular groove 326 causes the ball 3 to move.
Move to the position corresponding to 02. When the guide bush 54 is pulled out from the head main body 18 in this state, the second inclined surface 318 of the engaging recess 316 moves the ball 302 outward in the radial direction by the action of the inclined surface and pushes the ball 302 into the annular groove 326. The holding of 54 is released.

In addition, the reamer 52 and the guide bush 5
When holding 4, the bite moving shaft 296 is moved forward and then the reamer moving shaft 292 is moved backward. As a result, the drive sleeve 320 is urged by the spring 322 to move forward, and at this time, the first inclined surface 328 pushes the ball 302 out of the annular groove 326 by the action of the inclined surface and moves it into the engaging recess 316 of the guide bush 54. The guide bush 54 is held.

In each of the above embodiments, the annular protrusion 78 provided on the guide bush 54 is the blade portion 5 of the reamer 52.
6, the reamer 52 was pulled out from the head main body 18 together with the guide bush 54, but in the embodiment shown in FIG. 21, the shank 342 of the reamer 340 exceeds the outer peripheral surface of the blade portion 344. An engaging projection 346 protruding outward is provided to form a second engaging portion, and engages with an engaging groove 350 as a first engaging portion formed on the inner peripheral surface of the guide bush 348, The reamer 340 is drawn out together with the guide bush 348.

The engagement protrusion 346 is formed on the blade portion 3 of the shank 342.
The engaging groove 350 is provided in the vicinity of 44, and the engaging groove 350 is formed in a length from the tip end surface of the guide bush 348 in the axial direction so as to allow the entire blade portion 344 to be housed in the guide bush 348. .

In this embodiment, the guide bush 34 is used.
8 is pulled out, the inner end of the engagement groove 350 engages with the engagement protrusion 346, and the reamer 340 is pulled out together with the guide bush 348. In this case, the engagement protrusion 346 is not engaged with the engagement groove 3.
The relative phase of the reamer 340 with respect to the guide bush 348 is determined by fitting the reamer 340 into the engaging projection 34.
6 and the engaging groove 350 also serve as a reamer phase determining device and a fitting limit defining device.

Further, in the embodiment shown in FIG. 22, when the reamer 360 is pulled out, the guide bush 362 is also pulled out. At the end of the reamer 360 opposite to the side where the blade 364 is formed, the blade 3
An engaging portion 366 having a diameter larger than 64 is provided to form a second engaging portion, and a portion between the blade portion 364 and the engaging portion 366 has a
Engagement protrusion 368 protruding outward from the outer peripheral surface of the blade portion 364.
Is protruding.

Further, the guide bush 362 has a blade portion 3
The blade fitting hole 369 into which 64 is fitted is formed,
A fitting hole 370 into which the engaging portion 366 is fitted is formed at one end of the blade fitting hole 369 to form a first engaging portion, and the fitting hole 370 and the blade fitting hole 369 are formed. Engaging groove 372 extending axially from the stepped surface between the two toward the blade fitting hole 369 side
Are formed. In the reamer 360, the blade portion 364 is fitted into the guide bush 362 from the fitting hole 370 side, and the engagement protrusion 368 is engaged with the engagement groove 372, so that the reamer 360 is relieved.
And the relative phase of the guide bush 362 is determined.

In this embodiment, the reamer 360 is grasped by the grasping tool and pulled out. At this time, the engaging portion 3
66 engages with the stepped surface between the fitting hole 370 and the blade fitting hole 369, and the guide bush 362 is pulled out together.

Further, as shown in FIG. 23, the reamer 38
0 may be fitted into the guide bush 382 so as not to slip out. The shank 384 of the reamer 380 is formed with an engagement groove 386 that opens in the outer peripheral surface and extends in the axial direction, and forms a second engagement portion. Further, the inner diameter of the guide bush 382 is made equal to the diameter of the blade portion 388 of the reamer 380. It is screwed, and its tip is engaged groove 386.
It is fitted inside. The tip end portion of the screw member 390 is the first engagement portion.

Thereby, the relative phase of the guide bush 382 of the reamer 380 is determined and the reamer 380
Of the reamer 380 and the guide bush 382 is prevented from being pulled out from the guide bush 382, and one of the two end surfaces of the engagement groove 386 is engaged with the screw member 390, and the other is also removed. Withdrawn together.

Further, in each of the above-mentioned embodiments, the reamers 52, 340, 360,
380 and guide bushes 54, 304, 348, 3
The holding of 62,382 was supposed to be released,
The advancement of only the reamer moving shaft may release the holding of the reamer and the bush. For example, in the embodiment shown in FIGS. 1 to 18, the distance between the drive block 150 and the stopper block 182 is 5.6 mm,
The reamer moving shaft is moved forward by 7 mm. With this configuration, the stopper block 150 is not included in the drive block 18.
2 After contact, the reamer moving shaft 100 is relatively 1.4mm
The reamer's holding is released by moving forward. However,
In this case, the reamer 52 and the bush 54 are simultaneously held by the retreat of the reamer moving shaft 100. In the present embodiment, if it is not necessary to move the cutting tool 30, the cutting tool moving shaft 296 can be a shaft portion fixed to the head main body 18.

Further, in each of the above-described embodiments, the reamer holding device and the bush holding device are maintained in the held state by the elastic members, and the switching device releases each holding device against the biasing force of the elastic members. Although it is supposed to be in the state, the switching device may positively keep the reamer holding device and the bush holding device in the holding state.

In each of the above-described embodiments, the bite moving shafts 36 and 296 constitute the reamer releasing movement shaft, and the reamer moving shafts 100 and 292 constitute the bush releasing movement shaft. The moving shaft and the bush releasing moving shaft may be provided separately from the bite moving shaft and the reamer moving shaft.

Furthermore, it is possible to implement by changing the combination of the constituent elements of each of the above embodiments. Besides, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art without departing from the scope of the claims.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing a hole drilling device equipped with a reamer holding device with a guide bush, which is an embodiment common to the inventions of claims 1 to 4.

FIG. 2 is a front view showing the reamer.

FIG. 3 is a front sectional view showing the guide bush.

FIG. 4 is a side view showing the reamer and a guide bush fitted in the reamer.

FIG. 5 is a front view (partial cross section) showing a state in which the reamer is fitted to the guide bush.

FIG. 6 is a front view (partially sectional view) showing a bush holding device of the reamer holding device with a guide bush.

FIG. 7 is a front sectional view showing a tip portion of the reamer holding device with a guide bush.

FIG. 8 is a front sectional view showing a rear end portion of the reamer holding device with a guide bush.

FIG. 9 is a front view showing a collet of the reamer holding device with a guide bush.

FIG. 10 is a front sectional view showing the collet.

FIG. 11 is a side view showing the large diameter portion side of the collet.

FIG. 12 is a side view showing the small diameter portion side of the collet.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a front view showing a bush gripping tool that grips the guide bush when the reamer and the guide bush are replaced.

FIG. 15 is a block diagram showing a control device for controlling the hole drilling device.

FIG. 16 is a diagram illustrating replacement of a reamer and a guide bush in the hole drilling device.

FIG. 17 is a diagram illustrating replacement of a reamer and a guide bush in the hole drilling device.

FIG. 18 is a diagram illustrating replacement of a reamer and a guide bush in the hole drilling device.

FIG. 19 is a front sectional view showing a guide bush holding device of a reamer holding device with a guide bush which is another embodiment common to the inventions of claims 1 to 4.

FIG. 20 is a front sectional view showing a guide bush holding device of a reamer holding device with a guide bush which is another embodiment common to the inventions of claims 1 to 4.

FIG. 21 is a front sectional view showing a reamer and a guide bush of a reamer holding device with a guide bush which is another embodiment common to the inventions of claims 3 and 4.

FIG. 22 is a front sectional view showing a reamer and a guide bush of a reamer holding device with a guide bush which is another embodiment common to the inventions of claims 3 and 4.

FIG. 23 is a front sectional view showing a reamer and a guide bush of a reamer holding device with a guide bush according to still another embodiment of the invention of claim 3;

[Explanation of symbols]

 10 spindle 30 bytes 36 bytes moving shaft 52 reamer 54 guide bush 56 blade portion 58 shank 60 notch 64 engaging groove 78 engaging protrusion 80 engaging hole 82 bush holding device 86 lever 90 engaging pin 100 reamer moving shaft 104 reamer moving device 106 Bush release member 110 Collet chuck 142 Engagement protrusion 166 Disc spring 190 Cam surface 230 Control device 272 Collet chuck 292 Reamer moving shaft 294 Bush releasing member 296 Bite moving shaft 300 Bush holding device 304 Guide bush 340 Reamer 348 Guide bush 360, 380 Reamer 382 Guide bush

Claims (4)

[Claims] 1. A device for holding a hole drilling tool with a guide bush, which includes a hole drilling tool for performing hole drilling by rotation and a guide bush fitted to the outside of the hole drilling tool to guide the hole drilling tool. A holding device main body that is fixed to a main shaft that is rotatable about one axis, a bush holding device that is provided immovably in the axial direction relative to the holding device body, and that holds the guide bush releasably, A hole drilling tool holding device that is provided so as to be movable in the axial direction relative to the device body and holds the hole drilling tool releasably; and a bush holding device and a hole drilling tool holding device that are driven by a power drive device. A hole holding tool holding device with a guide bush, comprising: a switching device for switching between a release state and a holding state. 2. The switching device holds the hole drilling tool holding device and moves in the axial direction to move the hole drilling tool in the axial direction, and at the one end region of the axial movement range. The bush release moving shaft that switches the bush holding device between the holding state and the released state is provided so as to be movable in the axial direction, and the hole drilling tool holding device is held and released by relative movement with the bush releasing movement shaft. And a relative movement amount for switching the hole drilling tool holding device of both the moving shafts between the holding state and the released state, the bush holding device holding state. 2. The hole machining tool holding device with a guide bush according to claim 1, which is larger than a moving amount of a bush releasing movement shaft for switching to a released state. 3. A first engagement portion which is provided on each of the guide bush and the hole drilling tool which are fitted to each other and which defines a relative movement limit of the guide bush and the hole drilling tool in at least one direction. A relative movement limit defining device that has a second engaging portion, and the first engaging portion and the second engaging portion are provided at positions that allow a change in the amount of protrusion from the guide bush of the tip end portion of the hole drilling tool. The hole-machining tool holding device with a guide bush according to claim 1 or 2, including. 4. The first engaging portion is formed radially inward on the inner peripheral surface of the guide bush, while the second engaging portion is radially outward on the outer peripheral surface of the hole drilling tool. The hole-drilling tool holding device with a guide bush according to claim 3, which is formed so as to be engageable with the first engaging portion in a direction from the tip end side to the base end side of the hole-drilling tool.