JP5873670B2 - Angle head type tool holder - Google Patents

Description

  The present invention relates to a tool holder that is attached to a main spindle of a machine tool, and relates to an angle head type tool holder in which a cutting tool is inclined and cut with respect to the main spindle.

  An angle head type tool holder (usually simply referred to as an “angle head”) will be described with reference to FIGS. 1A and 2 showing an embodiment of the present invention. For example, a spindle of a machine tool such as a machining center A shank portion 10 that is detachably fitted to M, a holder main body 20 that rotatably supports the shank portion 10 and is fixed to a fixing member D of a machine tool, and a chuck portion provided in the holder main body 20 30. The casings 27 and 31 of the chuck portion 30 are integrated with the holder main body 20, and the driven shaft 40 in the casing is connected to the drive shaft 13 of the shank portion 10 passing through the holder main body 20, the rotational force transmitting means (bevel gear 26, 34, a flat gear 35a, etc.), and the rotational axis thereof is converted into an inclined direction (for example, a perpendicular direction) with respect to the rotational axis of the drive shaft 13 so that the rotational force can be transmitted (Patent Document). 1 see FIG.

  Further, in this type of tool holder, there is one in which the direction of the cutting tool A can be adjusted to an arbitrary angle around an axis having an angle with respect to the axis of the main shaft M (Patent Document 2, FIG. 1). 2, FIG. 8, etc. Patent Document 3 Claim 1 See FIGS. 1, 3, 10, etc.).

By the way, there are a wide variety of workpieces (workpieces) in machining, and as an example, in the machining of aircraft parts such as wing ribs, a 5-axis control machining center is used to complete the final shape in one set-up. Can be processed. In addition, efforts are being made to integrate processes, increase processing efficiency, and reduce costs. At this time, since the angle head type tool holder can be cut while being tilted with respect to the axis of the main shaft, it can further contribute to process integration and increase the processing efficiency.
In addition, a tool holder having a compact head connected with a small spur gear has been proposed as a small inner diameter machining, and the structure is such that spur gears are arranged in parallel on the same axis of the spindle axis (patent) Reference 4 FIG. 1).

JP 2004-130423 A Japanese Utility Model Publication No. 63-147241 JP 2006-123047 A JP 2010-137351 A

As can be understood from FIG. 1 of the document 1, the angle head type tool holder described in Patent Document 1 or the like is located on one side in a direction perpendicular to the axial direction c of the chuck portion 30 (see FIG. 1A). A cutting tool A is attached. For this reason, for example, in the case of a tool holder in which the cutting tool A is attached to the common rotation prevention pin P side of the holder body 20 fixed to the fixing member D (see FIG. 1 of the present application), as shown in FIG. On the other hand, when the shank portion 10 (main shaft M) moves relative to the axial direction c by a length L, the cutting length of the workpiece W in the axial direction of the main shaft M by the cutting tool A is such that the workpiece W is the holder body 20. Since the length L ₂ is a length L ₂ until it hits the recess wall surface (the wall surface of the mounting portion of the co-rotation prevention pin P in FIG. 1), and usually L> L ₂ , the shank portion 10 is relative to the workpiece W. Therefore, the performance of the machine tool cannot be fully utilized.
For this reason, conventionally, when trying to obtain the cutting action of the relative movement length L (= L ₁ ), the tool holder with the cutting tool A attached in the direction opposite to the direction in which the cutting tool A is attached is replaced. It is done. This operation is complicated and wasteful because it has two tool holders.

In addition, the angle head type tool holder described in Patent Document 1 provides various means for solving the demand for improvement to make the outer shape slim and easy to handle in a machine tool. However, even in such an angle head, there are many demands for interference avoidance and further compactness.
For example, there is a case in which a groove is formed inside a cylindrical shape (see the workpiece W in FIG. 6A) in a hydraulic cylinder part, but the inner diameter of the workpiece W is small, and the conventional angle described in Patent Document 1 is used. In a head-type tool holder, the head is large and often does not enter the hole. Further, in the case of a wing rib for an aircraft part, a hole is drilled in the base portion of the wall surface (see the workpiece W in FIG. 6B). It is often impossible to machine with the angle head type tool holder.

The tool holder that can adjust the direction of the cutting tool A described in Patent Documents 2 and 3 to an arbitrary angle around an axis with respect to the axis of the main shaft M is the axial direction of the cutting tool A. Therefore, it is easy to make the cutting length of the cutting tool A correspond to the axial relative movement length L of the shank 10 with respect to the workpiece W, but the angle adjustment mechanism is complicated.
In addition, the tool holder described in Patent Document 4 is suitable for machining the inner surface of a hole because a compact head is realized by arranging spur gears in parallel (gear train) on the spindle axis. However, in the wall machining of aircraft parts, the body interferes and machining at deep positions is difficult. Even if the angle head is extended for a long time, the gear train portion is thin and not rigid, so that smooth and high-precision machining cannot be performed due to bending due to the reaction force from the workpiece during cutting.

  In the angle head type tool holder described in Patent Document 1 or the like, the present invention has a first problem that the cutting tool can be attached in both the left and right directions (reversible) in the axial direction. A second problem is to make the chuck portion compact.

In order to achieve the first object, the present invention allows the mounting holes of the cutting tool A of the chuck portion 30 to penetrate both side surfaces of the chuck portion 30, and allows the cutting tool to be mounted from both openings of the through holes. It was decided.
That is, conventionally, for example, the driven shaft described in Patent Literature 1 (reference numeral 5 in FIG. 5) can be inserted into and removed from the through-hole through the casing and the bevel gear (G2). In the tool holder, the cutting tool A is attached to the chuck part in one mode (the cutting operator does not replace the cutting tool A in one tool holder). The driven shaft is also not adapted to mount and fix the cutting tool in the through hole from the opening opposite to the mounting position of the cutting tool.

The present invention breaks the fixing concept of attaching one cutting tool to the one tool holder, enables the cutting tool to be mounted from both openings of the through hole, and the cutting tool is attached to one tool holder. By enabling the mounting in the axial direction opposite to the left and right, a cutting mode that has not existed conventionally, for example, as shown below, in FIG. A mode in which the cutting length L ₁ of the workpiece W in the axial direction of the main spindle M can be the same (L = L ₁ ) can be obtained by A.
There is also a tool holder (double-edged tool holder) that attaches a cutting tool to both sides of the chuck, but this tool holder is premised on using two cutting tools. When cutting, the other cutting tool may get in the way.

As a configuration of the present invention, the casing of the chuck part is integrated with the holder main body, and the rotational force is transmitted to the driven shaft in the casing from the drive shaft of the shank part passing through the holder main body via the rotational force transmitting means. in angle head type tool holder that is can be transmitted, the driven shaft, the casing and through the rotational force transmission means removable from the both openings of the through-hole and securable in its insertion state and rotational force transmitting means On the other hand, it is possible to employ a configuration in which the cutting tool can be mounted on the driven shaft, which can be fixed in the rotational direction.
By reversible by inserting / removing the driven shaft into / from both through-hole openings, the tool holder can be made more compact and versatile.
As the structure of the through hole, for example, the rotational force transmitting means can be used as a gear mechanism, and the shaft hole of the final gear and the hole of the casing can be used.
At this time, the hole of the casing can be an inner hole of a bearing provided in the casing on both sides of the shaft center hole of the gear of the final stage, and the through hole has both ends of the same diameter over the entire length in the axial direction. opened but have driven shaft with openings and can be inserted and removed from the both openings, Rutotomoni have a key that projects its axis hole provided in the final gear, the shaft end on the outer peripheral surface of the driven shaft and axial grooves are formed, is key to the grooves I fitted from the shaft end opening, together with the driven shaft has become removable from the through hole, and the final stage gear can rotationally fixed it can be assumed that.

In order to achieve the second object, in the present invention, in the angle head type tool holder, the rotational force transmission from the drive shaft to the cutting tool via the driven shaft is made the flat gear train structure of Patent Document 4, The casing axis of the gear train structure is displaced with respect to the axis of the holder body (see FIG. 1A).
Thus, by deviating both axial centers a and c, the chuck portion (angle head portion) of the flat gear train structure can be made thin and compact with respect to the holder body. Moreover, since the cutting tool A can be positioned on the axis of the holder main body due to the deviation of both axial centers (see FIGS. 1A and 5), the cutting tool A overhangs from the axial center. The amount is reduced, and the fall in the transverse feed cutting such as end milling can be suppressed.

As a configuration of the present invention, in the angle head type tool holder, the rotational force transmission means from the drive shaft of the shank portion to the chuck portion driven shaft is engaged with the drive side bevel gear attached to the drive shaft and the drive side bevel gear. The gear mechanism is composed of a driven bevel gear and a group of a plurality of flat gears arranged in parallel to the driven bevel gear. The flat gear group has a parallel flat gear at one end and the same axis as the driven bevel gear. the attached together so as to rotate integrally, spur gear axis hole and the hole of the chuck casing of the spur gear is the final stage of the other end meshing with each other in each stage other than the spur gear of one end Is the through hole of the same shaft, the shaft center of the chuck part is offset laterally with respect to the axis of the holder body, the casing of the chuck part is the holder Is formed on the deaths portion set back with respect to, the direction from the death portion spur gear of the final stage with and extends over the entire length of the straight spur gear group, also said died portion opposite to the casing of the chuck section It can be set as the structure extended over the full length of the flat gear group toward the flat gear of the last stage.

In both the above-described inventions, when the through hole is composed of a shaft center hole of the last gear of the gear mechanism and a hole of the chuck portion casing, the driven shaft includes a cylindrical portion that fits into the shaft hole of the last gear. , a flange portion of the cylindrical portion at one end consists of a cover that fits on the cylindrical portion and the other end, in a state where the driven shaft is Tsu fitted in the axial hole of the spur gear of the final stage, the casing by the flange portion and the cover There clamping rare, with at snap ring to be fitted to the rear end of the cover of the cylindrical portion, it is possible to mount rotatably and retaining to the driven shaft to the casing. At this time, if the collar portion and the cover are in pressure contact with the casing, a sealing function that prevents the coolant and the like from entering the casing is exhibited. This sealing function is ensured regardless of which opening of the through hole the driven shaft is attached to.

The cutting tool can be mounted on the driven shaft directly on the driven shaft mounting hole (cutting tool mounting hole) by shrink fitting, side lock type, collet chuck type, etc. A chuck can be attached to the core hole, and a cutting tool can be attached by the chuck. As the chuck, a conventionally known collet type, shrink fit type, side lock type, or the like can be considered. At this time, if the mounting hole has a function capable of mounting a chuck in which the cutting tool is shrink-fitted and fixed, such as by screwing in a pulling bolt 48 described below , the chuck structure is compact if the shrink-fitting type is used. In addition, when the chuck is fitted to the driven shaft on which the cutting tool is mounted, the rigidity of the chuck is secured by the thickness of both, so the thickness of the cylindrical portion for inserting the chuck of the driven shaft can also be reduced. .

  Since the present invention is configured as described above and the mounting position of the cutting tool is made reversible, a wide range of machining can be performed with one angle head type tool holder. It can also be made compact.

1 shows an embodiment of the present invention, (a) is a front view, (b) is a partial right side view. Main part cutting front view of the same embodiment The exploded perspective view from the left side of the principal part of the embodiment Exploded perspective view from the right side (A), (b) is sectional drawing for each effect | action description of the same embodiment Action explanatory diagram of the same embodiment (A), (b) is each operation explanatory drawing of the same embodiment (A)-(c) is each attachment mode figure of a cutting tool (A)-(c) is each other attachment mode figure of a cutting tool (A)-(c) is each other attachment mode figure of a cutting tool. Still another installation view of the cutting tool

  1 to 4 show an embodiment of the present invention, and an angle head type tool holder of this embodiment also has a shank portion 10 detachably fitted to a spindle M of a machine tool, as in the prior art, and its The holder main body 20 that rotatably supports the shank part 10 and a chuck part 30 provided on the holder main body 20, and their axial directions (the shank part 10, the axis a of the holder main body 20, the chuck part 30 The axis c) is in the same direction, and the axis c of the chuck portion 30 is the radial direction (side) of the shank portion 10 (holder body 20) with respect to the axis a of the shank portion 10 (holder body 20). It is biased to.

  The shank portion 10 includes a tapered cone portion 11 that fits into a tapered hole of the main shaft M, a flange portion 12 that has an annular groove that fits into a bracket of a cutting tool magazine, and a shaft portion 13 (hereinafter referred to as a drive shaft) that follows the tapered cone portion 11. , Referred to as “drive shaft 13”).

The holder body 20 includes a bearing case (casing) 21 through which the drive shaft 13 passes, and a block 22 of a co-rotation prevention pin P bolted to a side surface of the bearing case 21. When the tool holder is set (attached) to the spindle M, the co-rotation prevention pin P fits into the hole of the fixing member D of the machine tool and fixes the bearing case 21 (holder body 20) to the machine tool.
In addition, an orientation ring 14 is provided between the bearing case 21 and the flange portion 12 of the shank portion 10, and the orientation ring 14 is inserted into the flange portion 12 (shank portion 12) by screwing a bolt 15 at an arbitrary position around the flange portion 12. This is fixed to the part 10), and by fixing this arbitrary position, the spindle M drive key (not shown) and the co-rotation prevention pin when the tool holder is set in the automatic tool changer (ATC) and when the tool magazine is stored. The phase relationship of P is adjusted in the range of 0 to 360 degrees.

  The drive shaft 13 is rotatably supported by the bearing case 21 through the bearing 23 and the collar 24 with the same axis, and the shank portion 10 is rotatably supported by the holder body 20. Further, a nut 25 is screwed into the male screw portion 13 a at the tip of the drive shaft 13 via a collar 25 a and a washer 25 b so that the inner ring of the bearing 23 and the collar 24 are integrated with the drive shaft 13. Further, a drive-side bevel gear (bevel gear) 26 is fitted to the tip of the drive shaft 13 via a collar 26a, and this bevel gear 26 is driven by a set screw (not shown) through a key (not shown). 13 is fixed.

  The base portion of the casing 27 is fitted on the outer periphery of the bearing case 21 with the same axis, and the bearing case 21 is covered by the casing 27 and a part of the casing of the chuck portion 30 is formed. A hexagonal bolt 28 is inserted into the casing 27 around the taper cone portion 11 side around the fourth equivalent position. The hexagon bolt 28 is screwed into a half nut 28b fitted in a dovetail groove 28a on the outer periphery of the bearing case 21, and the casing 27 is rotated relative to the bearing case 21 to an arbitrary position around the axis to halve the hexagon bolt 28. By screwing into the nut 28b, the half nut 28b is pressed against the inner surface of the dovetail groove 28a, and the casing 27 is fixed to the bearing case 21 at an arbitrary position (see Patent Literature 3, paragraphs 0020 and 0023). For this reason, by setting the fixed position arbitrarily, the mounting direction of the cutting tool A around the axis a of the shank portion 10 with respect to the common rotation prevention pin P can be set to an arbitrary position.

Portions extending to the chuck portion 30 of the casing 27, with respect to the axis a of the holder main body 20 is formed in the deaths portion 27a and displaced laterally, the entire length of the following spur gear group (gear train) from the sinking section It extends straight across. A casing (cover) 31 of the chuck portion 30 is screwed to the straightly extending casing 27 (see FIG. 1B). This casing 31 also extends straight over the entire length of the flat gear train.

In the casings 27 and 31, a first driven shaft (middle shaft) 32a, a second driven shaft (middle shaft) 32b, and a third driven shaft (lead shaft) 40 orthogonal to the drive shaft 13 are rotatable in parallel via a bearing 33a. Is provided. The number of driven shafts (a gear train such as the following flat gear 35a) is appropriately determined according to the length of the chuck portion 30 (in the direction of the axis c), and the tip of the driven shaft is a head on which the cutting tool A is mounted.
A driven bevel gear 34 meshing with the drive side bevel gear 26 is attached to the first driven shaft 32a via a key (not shown), and the first driven shaft 32a and the second and third driven shafts 32b, 40 are attached to the first driven shaft 32a. Spur gears (spur gears) 35a, 35b, and 35 meshing with each other are similarly attached via keys (not shown). Therefore, the rotational force of the drive shaft 13 is applied to the third driven shaft 40 constituting the head via the respective flat gears 35a, 35b, 35 after the transmission direction is changed to the right angle direction by the two bevel gears 26, 34. Communicated. The third spur gear 35 is rotatably supported by a bearing 33a provided on the casing 31 on both sides of the axial center hole of the gear 35 that rotatably supports the third driven shaft 40 via a collar 33b.

A hole 40a formed on the inner peripheral surface of the bearing 33a and the collar 33b has the same diameter over the entire length in the axial direction , and both ends open, and the third driven shaft 40 can be inserted and removed from both openings of the through hole 40a. .
As shown in FIGS. 3a and 3b, the third driven shaft 40 includes a cylindrical portion 41a and a flange portion 41b at one end thereof, and an axial groove 42 that opens to the axial end is formed in the cylindrical portion 41a. Has been. For this reason, when the third driven shaft 40 is mounted (inserted) into the through hole 40a, the key 42a provided on the inner surface of the third spur gear 35 is fitted into the groove 42 from the shaft end opening . The three driven shafts 40 can be inserted into and removed from the through holes 40 a and are integrated with the third spur gear 35. That is, the third driven shaft 40 is fixed to the third spur gear 35 in the rotation direction and rotates integrally.

  As shown in FIGS. 4 (a) and 4 (b), the third driven shaft 40 fitted (attached) in the third spur gear 35 has a cylindrical portion tip from either one of the openings of the through hole 40a. And the cover 43 is fitted to the tip of the cylindrical portion, and then the stopper 44 is fitted into the groove 44a at the tip of the cylindrical portion 41a to prevent the chuck portion 30 from coming off. . At this time, the flange portion 41b and the cover 43 are brought into pressure contact with the casings 27 and 31 (bearings 33a), thereby exhibiting a sealing function for preventing the coolant and the like from entering the bearings 33a (casings 27 and 31). For this reason, even if it inserts the 3rd driven shaft 40 from which opening of the through-hole 40a, the sealing function is ensured.

  A shrink-fit chuck 47 is fitted into the third driven shaft 40, and a pulling bolt 48 of the third driven shaft 40 is screwed into a rear portion of the chuck 47, so that the chuck 47 has a tapered tool mounting hole of the third driven shaft 40. It is pulled into 40c and fixed. For this reason, the required cutting tool A is attached to the chuck 47 by shrink fitting, and the chuck 47 with the cutting tool A is fitted and fixed to the third driven shaft 40, whereby the cutting tool A is attached to the tool holder. At this time, the mounting direction of the cutting tool A with respect to the tool holder is set by reversing the mounting direction of the chuck 47 to the third driven shaft 40 with respect to the axial direction shown in FIGS. 4 (a) and 4 (b). There are two ways. In the figure, reference numeral 49 denotes a bearing steel ball of a pulling bolt 48 provided at a circumference of about 14 equidistant.

  As described above, the shrink-fit chuck 47 can be small in size and compact, and when the chuck 47 is fitted to the third driven shaft 40, the rigidity is secured by the thickness of the both. Therefore, the thickness of the cylindrical portion 41a of the driven shaft 40 can be reduced. Incidentally, since the rigidity of the chuck 47 is low in the collet chuck (see FIG. 7A) with slits in the axial direction, the rigidity of the third driven shaft 40 and the chuck 47 is the same as that of the third driven shaft 40. Mainly, it must be secured, and the thickness of the tubular portion 41a must be increased.

  Further, as shown in FIGS. 1A and 2, the gear trains of the flat gears 35 a, 35 b, and 35 are located on the axis c of the chuck portion 30, and the third driven shaft 40, the cover 43, and the bearing Since the configuration of 33a and the like is substantially symmetric with respect to the axis c, the chuck portion 30 is prevented from causing weight deviation around the axis c as much as possible. For this reason, even if the attachment of the third driven shaft 40 is reversed left and right (FIG. 4 (a) or (b)), the rigidity does not change and the weight deviation does not change greatly.

Further, normally, in a machining center, a maximum tool diameter is set in the ATC and the tool magazine in order to safely change tools according to the size. Particularly in the case of a small machining center, the maximum tool diameter is small, for example, there are many restrictions within a diameter of 80 mm. The use of small machining centers is increasing year by year.
In the tool holder of this embodiment, the casing 27 on one side of the chuck portion 30 is displaced laterally with respect to the axis a of the holder body 20 to form a recessed portion 27a, and the head (the last stage) is formed from the recessed portion 27a . Since the other casing 31 also extends straight toward the head, the chuck portion 30 has a highly rigid and compact configuration, for example, the width of the head. (Length between the protruding side surface of the chuck 47 and the head side surface of the pulling bolt 48) is 31.5 mm, and the circle (circumscribed circle) when the tool holder rotates around the axis c of the holder body 20 is 36 mm in diameter. Thus, it is well within the ATC replacement limit range. That is, the tool holder of this embodiment can be replaced with an ATC while ensuring sufficient protrusion of the cutting tool A.
Incidentally, the maximum tool diameter includes a tool holder and a tool. In the case of an angle head, the maximum tool diameter includes a head portion and a tool. At this time, if the tool mounting position is at a position overhanging from the spindle axis a, the limit is easily exceeded and automatic replacement cannot be performed.

  The tool holder of this embodiment has the above-described configuration. When the tool holder is attached to the spindle M and the cutting tool A is attached to the tool holder and the shank portion 10 is rotated as in the conventional case, the drive shaft 13, The third driven shaft (front shaft) 40 rotates through the bevel gears 26 and 34, the flat gear 35a (driven shaft 32a), the flat gear 35b (driven shaft 32b), and the flat gear 35, and the cutting tool A through the chuck 47. Rotates. By applying the rotating cutting tool A to the workpiece W, the workpiece W is cut.

At this time, as shown in FIG. 5, if the shank portion 10 (main shaft M) is movable relative to the workpiece W by a length L, the workpiece W in the axial direction of the main shaft M is cut by the cutting tool A. 3a and 4 (a), the cutting length is the length until the workpiece W hits the wall surface of the concave portion (recessed portion 27a) of the casing 27 of the holder body 20. it is L _2. On the other hand, FIG. 3b, When it is mounted embodiment of the cutting tool A shown in FIG. 4 (b), the same L ₁ and its relative movement length L. That is, the interference area is relaxed, the machining range of the workpiece wall surface is expanded, and the range in which the cutting tool A is positioned to an arbitrary position of the workpiece W is expanded.

  In the case of FIG. 4 (a), since the cutting tool A is on the axis a of the spindle M, the amount of overhang from the axis a of the cutting tool A is reduced, and it falls down in transverse feed cutting such as end milling. Can be reduced. Further, as shown in FIGS. 1A and 2, since the cutting tool A is located in the cross section of the holder main body 20 and the chuck portion 30, it is effective when machining in a narrow hole.

  Furthermore, since the tool holder of this embodiment has a high torque, a high rigidity, and a compact size, the inner surface machining of the small holes shown in FIG. The inner surface processing of the narrow groove shown in (b) and the deep wall surface processing can be smoothly performed. In addition, because it is reversible so that the mounting position of the cutting tool A can be exchanged, it can flexibly cope with various types of processing that are currently in trouble, and for users who need multiple special angle heads. A single unit can handle a wide range. In general, since the angle head is an expensive tool, the cost is greatly reduced and it is economical.

  This change in the mounting mode of the cutting tool A is achieved by removing the tool holder from the main shaft M, the chuck 47 with the cutting tool A together with the front shaft (third driven shaft) 40 and the third bearing 33a (third flat gear 35). The mounting direction of the cutting tool A is changed by removing it from the hole 40a, that is, by changing the mounting mode from FIG. 4 (a) to (b) or (b) to (a). . However, since the tool holder is normally removed from the spindle M and the mounting direction of the cutting tool A is changed, it is needless to say that the tool holder may be removed from the spindle M and changed.

  By the way, this tool holder has an unprecedented external form (Fig. 1 (a) XX and later) consisting of casings 27, 31 and the like extending from the drive-side bevel gear 26 to the driven shaft 40. The shape (design) is novel in this type of angle head type tool holder.

The chuck 47 is not limited to the shrink-fit type, and a known type such as a collet type shown in FIG. 7A and a side lock type shown in FIG. In the case of the side lock type, a plurality of side lock screws 50 can be provided at equal positions around the periphery, or the both side lock type shown in FIG.
Further, when the chuck 47 is not provided and the third driven shaft (front shaft) 40 is a chuck, for example, the shrink-fit type shown in FIG. 8A, the side lock type shown in FIG. The collet nut 51 can be screwed into the third driven shaft 40 shown in (c), and the collet chuck 52 to which the cutting tool A is attached can be tightened and fixed by the collet nut 51. If the third driven shaft 40 is a chuck and the cutting tool A is a shrink-fitting type or a side lock type, it is more compact in combination with reversible by inserting / removing the through hole 40a of the third driven shaft 40 into / from both openings. It becomes a tool holder that combines generalization and versatility.

  The cutting tool A can be not only the above-described drill but also a screw tap shown in FIGS. 7C and 9C or a side cutter A shown in FIG. . In the case of the side cutter A, a known one such as a method of attaching the attachment bolt 53 via a spacer 54 so as to be screwed can be appropriately employed. Also in this case, the side cutter A can be attached to both ends in the axial direction of the third driven shaft 40 with the mounting bolts 53 or the like.

When the third driven shaft 40 is a chuck, as shown in FIG. 9, the cutting tool A can be attached from both ends, and the cutting tool A is a double side lock type in which each side screw 50 is fixed. ((A), (c) in the figure), or a collet type ((b) in the figure).
At this time, the cutting tools A mounted on both sides of the driven shaft 40 can be different. For example, by forming one hole as a drill and the other as a screw tap, a screw thread can be formed on the inner surface of the hole after the hole is formed with the drill.
Also, the mounting means of the cutting tool A may not be the same at both ends of the third driven shaft 40, one may be shrink-fitted, and the other may be different from the collet type.

In the above embodiment, the rotational force transmitting means is constituted by the gear mechanism (gear mechanism) of the bevel gears 26 and 34 and the flat gears 35a, 35b and 35. However, instead of the gear mechanism, a universal joint (see FIG. 4 of Patent Document 3). Other means such as can be used.
Further, the inclination angle of the axis of the drive shaft 13 and the axis of the driven shaft 40 is not limited to a right angle (90 degrees), but is arbitrary such as 45 degrees and 60 degrees. Depending on the inclination angle, the configuration of the rotation transmitting means is also changed. For example, in the gear mechanism, the inclination of the teeth of the bevel gears 26 and 34 is made to correspond to the angle.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10 Shank part 11 Tapered cone part 12 ridge part 13 shaft part (drive shaft)
20 Holder body 21 Bearing case 22 of holder body Block 23 of co-rotation prevention pin P Bearing 26 Drive-side bevel gear 27 Bearing case casing 30 Chuck part 31 Chuck part casing (cover)
32a, 32b First and second driven shaft (middle shaft)
33a Bearing 34 Driven bevel gear 35 Final gear (flat gear)
35a, 35b Spur gear 40 Third driven shaft (front shaft)
40a Through hole 40c Cutting tool mounting hole 42 of driven shaft Key groove 42a of third driven shaft Key 44 Retaining ring 47 of third driven shaft Chuck A Cutting tool

Claims (4)

A shank portion (10) that is detachably fitted to the main spindle (M) of the machine tool, and a holder body that is rotatably supported by the shank portion (10) and fixed to the fixing member (D) of the machine tool ( 20) and a chuck portion (30) provided in the holder body (20), and the casings (27, 31) of the chuck portion (30) are integrated with the holder body (20), and the casing Rotational force of the driven shaft (40) of the shank from the drive shaft (13) of the shank portion (10) passing through the holder body (20) through the rotational force transmitting means (26, 34, 35a, 35b, 35). In the angle head type tool holder that can transmit
The driven shaft (40) is fixable in the rotational direction with respect to insertion and removal possible and fixable and rotational force transmission means on the insertion state from the both openings of the through hole through the casing and the rotational force transmitting means (40a) The cutting tool (A) is attached to the driven shaft (40),
The rotational force transmitting means comprises a gear mechanism, and the through hole (40a) is a bearing provided in the axial center hole of the gear (35) at the final stage of the rotational force transmitting means and the casing on both sides of the axial center hole. (33a) consisting of an inner hole, the through hole (40a) has the same diameter over the entire length in the axial direction, both ends open, and the driven shaft (40) can be inserted and removed from both openings,
The final stage gear (35) that has a key projecting in the axial bore (42a) is provided in Rutotomoni, axial groove which is open at the shaft end on the outer peripheral surface of the driven shaft (40) (42) There is formed, the key (42a) is I fitted from the shaft end opening into the groove (42), together with the driven shaft (40) has become removable from the through-hole (40a), the last stage An angle head type tool holder which can be fixed to the gear (35) in the rotation direction. The rotational force transmitting means includes a driving side bevel gear (26) attached to the driving shaft (13), a driven side bevel gear (34) meshed with the driving side bevel gear (26), and a driven side bevel gear (34). The spur gear group is composed of a group of a plurality of spur gears (35a, 35b, 35) arranged in parallel. The spur gear group has a spur gear (35a) at one end in parallel with the driven bevel gear (34). together so as to rotate integrally mounted on the same shaft (32a), the other end of the spur gear spur gear of each stage other than the one end of the spur gear (35a) (35b, 35) are meshed with each other (35) is the final gear (35),
The axis (c) of the chuck part (30) is laterally displaced with respect to the axis (a) of the holder body (20), and the casing (27) of the chuck part (30) is offset. deaths portion retracted with respect to position the opposite holder body (20) is formed in (27a), the length of the straight spur gear group towards the final stage of the spur gear (35) from the deaths portion (27a) And the casing (31) on the opposite side of the recessed portion (27a) of the chuck portion 30 also extends over the entire length of the flat gear group toward the final stage spur gear (35). The angle head type tool holder according to claim 1. The driven shaft (40) includes a cylindrical portion (41a) that fits into the axial hole of the final stage spur gear (35), a flange portion (41b) at one end of the cylindrical portion (41a), and a cylindrical shape thereof. becomes because the parts (41a) cover to fit the other end (43), the cover while the driven shaft (40) which Tsu fitted to the flat axial bore of the gear (35) of the final stage, the collar portion and (41b) (43) a rare the casing is sandwiched, rear end is fitted and stopper ring (44) of the cover (43) of the tubular portion (41a), said driven shaft (40) is rotatable in said casing and stopper to angle head type tool holder according to claim 1 or 2, characterized in that it is kicked attached.   The driven shaft (40) has a tool mounting hole (40c), and the tool mounting hole (40c) is provided with a function capable of mounting a chuck (47) on which the cutting tool (A) is shrink-fitted and fixed. The angle head type tool holder according to any one of claims 1 to 3, wherein the angle head type tool holder is provided.

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