JP2017109260A - Combination structure of shrink fit type tool holder and circumferential position indicator, and circumferential position indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shrink fit type tool holder allowing completion of shrink fitting work in a short time.SOLUTION: A shrink fit type tool holder (10) comprises: a holder body (11) having a tool holding hole (122) extending from the tip in the axis (O) direction toward a rear end side, and a shrink fit mounting/dismounting part (12) which is a cylindrical portion defining the tool holding hole and to which the shank part of a cutter inserted into the tool holding hole is shrink-fitted; a retaining/revolution-stopping mechanism (21) which is provided at a predetermined circumferential position of the holder body and engages with the shank part (61) of the cutter (60) inserted toin the tool holding hole to regulate axial movement and/or revolution of the shank part; and a marking (24) provided at a circumferential position in an axial end surface of the holder body, which corresponds to the retaining/revolution-stopping mechanism.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shrink-fit tool holder including a side lock bolt.

  2. Description of the Related Art Conventionally, many shrink-fit tool holders that chuck a blade using the thermal contraction and thermal expansion of a tool holder main body are known.

  In recent years, in the aircraft field and the like, it has been required to cut difficult-to-cut materials such as titanium alloys and Inconel (registered trademark) for a long time. When cutting difficult-to-cut materials for a long time, even if the tool is securely chucked with the tool holder, the tool will come out of the shrink-fit tool holder compared to cutting with a soft aluminum material. There was a problem to come.

  As a conventional technique for solving such a problem, for example, a shrink-fit tool holder described in a republished patent WO2013 / 027558 (Patent Document 1) is known. The shrink-fit tool holder of Patent Document 1 includes a cylindrical holding hole formed in the shrink-fit chuck portion, and two retaining protrusions formed on the inner peripheral surface of the cylindrical holding hole and facing each other. And a rotation stopper protrusion formed on the inner peripheral surface of the cylindrical holding hole on the rear end side in the axial direction with respect to each protrusion stopper. A circumferential groove and a pair of flat surfaces are formed on the outer periphery of the rear end of the shank of the cutting tool.

  When inserting the shank part of the cutting tool into the cylindrical holding hole of the shrink-fit chuck part, the circumferential position of the pair of flat surfaces at the rear end of the shank part is set to the two retaining positions behind the cylindrical holding hole. The shank part is inserted deeply into the cylindrical holding hole and is slightly rotated in the circumferential direction. Contact the flat surface of the tool.

Republished patent WO2013 / 027558

  The chucking of the cutting tool to the shrink-fit tool holder is not limited to Patent Document 1, and the shrink-fit chuck portion of the shrink-fit tool holder is heated by a shrink-fit heating device (also referred to as a shrink-fit head) to form a cylinder. This is done by shrink-fitting work to expand the shape holding hole. If the heating time is prolonged, problems such as discoloration of the shrink-fit chuck portion as if burnt in black occur, and therefore the shrink-fit operation must be completed in a short time.

  However, the pair of flat surfaces at the rear end of the shank portion described in the cited document 1 is hidden in the cylindrical holding hole at the same time as being inserted, and the circumferential position of the flat surface cannot be determined. Further, since the pair of retaining projections provided in the shrink-fit chuck portion described in the cited document 1 is hidden in the shrink-fit heating device, the circumferential position of the retaining projection cannot be determined. Then, it takes a considerable amount of time to insert the shank part deeply into the cylindrical holding hole by precisely matching the circumferential position of the flat surface and the circumferential position of the retaining protrusion.

  Further, the shank portion has a cylindrical shape, and the shrink-fit chuck portion has a cylindrical shape, and there is no target for distinguishing the circumferential position in both cases. Furthermore, the shrink-fitting type heating device has a size much larger than that of the shrink-fitting type chuck part and completely covers the tip of the shrink-fitting type chuck part. It is difficult to insert to pass through the stop projection.

  If it does so, it will take time for shrink fitting work, and the problem that the shrink fitting type chuck | zipper part will discolor like a black burn will arise.

  In view of the above circumstances, an object of the present invention is to provide a shrink-fit tool holder that can finish shrink-fit work in a short time.

  For this purpose, the shrink-fit tool holder according to the present invention includes a tool holding hole extending in the axial direction from the front end in the axial direction toward the rear end side, and a cylindrical portion that defines the tool holding hole. A holder main body having a shrink-fit detachable portion for shrink-fitting the shank portion of the cutter to be inserted, and the shank portion provided at a predetermined circumferential position of the holder main body and engaged with the shank portion of the cutter inserted into the tool holding hole. And an anti-rotation mechanism for restricting movement and / or rotation of the holder body, and a marking indicating a circumferential position corresponding to the anti-retention / rotation mechanism on the axial front end surface of the holder body.

  According to the shrink-fit type tool holder of the present invention, the marking is provided on the tip end surface in the axial direction of the holder body, and the marking is disposed at a circumferential position corresponding to the retaining / rotating prevention mechanism. The circumferential position of the retaining / rotating mechanism can be determined from the tip side of the holder. Since the marking indicates the circumferential position of the retainer / rotation prevention mechanism, when inserting the shank part of the blade into the tool holding hole of the shrink-fit tool holder, the operator must place the circumferential position of the engaged part on the outer periphery of the shank part. Can be inserted in accordance with the marking on the tip of the shrink-fit tool holder, and the working time of the shrink-fit work can be shortened. The marking is not particularly limited, such as printing, protrusions, or recesses. The retaining / rotating prevention mechanism is provided at a position in the axial direction different from that of the shrink-fitting attachment / detachment portion. The shrink-fit detachable part may occupy the tip end region in the axial direction of the holder body. The retaining / rotating preventing mechanism may be provided at one place or a plurality of places on the holder body.

  The structure of the retainer / anti-rotation mechanism is not particularly limited. For example, a protrusion formed at a predetermined circumferential position on the inner peripheral surface of the tool holding hole or a predetermined circumferential position on the inner peripheral surface of the tool holding hole. It is a movable member attached to. The retainer / anti-rotation mechanism has a function of engaging with the shank part to prevent the cutter from coming out of the tool holding hole, or preventing the cutter from rotating in the tool holding hole. It has a function to perform, or has both functions.

  The engaged portion that is formed in the shank portion and engages with the retaining / rotating preventing mechanism is not particularly limited, and may be, for example, a concave portion or a flat surface. According to a preferred embodiment of the present invention, the retaining / rotating mechanism includes a through hole extending from the outer peripheral surface of the holder body to the tool holding hole, a female screw formed on the inner peripheral surface of the through hole, and screwing into the screw. And a side lock bolt whose tip abuts against the shank portion of the blade. According to this embodiment, when the side lock bolt is tightened and rotated so as to be screwed in, the tip of the side lock bolt comes into contact with the shank portion of the cutter, and the axial movement and / or rotation of the shank portion can be restricted. it can. The number of side lock bolts may be one or more. The plurality of side lock bolts may be arranged away from each other in the axial direction or may be arranged away from each other in the circumferential direction. Of the shank portion of the blade, the shape of the contacted portion that contacts the side lock bolt is not particularly limited, but is preferably a recess or a flat surface formed on the outer peripheral surface of the shank portion.

  The tip of the shrink-fit tool holder is heated by being covered with a shrink-fit heating device, and the shank portion of the tool passes through a through-hole provided in the shrink-fit heating device and becomes a tool holding hole of the shrink-fit tool holder. Plugged in. The through hole is slightly larger in diameter than the shank portion of the tool, and the tip surface of the shrink-fit tool holder can be seen from the tip end side in the axial direction through the through hole. Therefore, as a preferred embodiment of the present invention, the marking is provided adjacent to the tool holding hole. According to this embodiment, even if the through hole of the shrink-fitting heating device is relatively small, the marking can be easily visually recognized through the through hole from the front end side in the axial direction.

  The marking is not limited to the front end surface in the axial direction of the holder body. As a preferred embodiment of the present invention, a marking is further provided at a circumferential position corresponding to the retaining / rotating preventing mechanism on the outer peripheral surface of the holder body. According to this embodiment, the operator can visually recognize the marking from the outside of the shrink-fit tool holder.

  While the shrink-fit tool holder of the present invention is heated by the shrink-fit heating device, the tool holding hole of the shrink-fit tool holder is expanded, and the shank portion of the blade can be inserted into and removed from the tool holding hole. When inserting the shank part into the tool holding hole, the shank part is rotated and moved so that the engaged part provided on the outer periphery of the shank part is at the same circumferential position as the retainer / anti-rotation mechanism of the shrink-fit tool holder. It must be inserted with attention to the circumferential position of the engaged part.

  For reference, the shrink fitting operation of the shrink fitting tool holder is schematically shown in FIG. The shrink-fit tool holder 20 of the present invention includes a shrink-fit tool attaching / detaching portion 12 including a tool holding hole 122, side lock bolts 23 and 23b, and markings 24 and 24b. A recess 84 is provided on one side of the shrink-fit heating device 80, and a through hole 85 is provided on the other side. In the shrink fitting operation, the tool attaching / detaching portion 12 is inserted into the recess 84 from one side of the shrink fitting heating device 80, and the tool attaching / detaching portion 12 is thermally expanded by energizing the shrink fitting heating device 80 to expand the tool holding hole 122. The shank portion 61 of the blade 60 is inserted into the tool holding hole 122 via the through hole 85 from the other side of the shrink-fitting heating device 80. At the time of such insertion, the circumferential positions of the flat surfaces 62 and 63 are aligned with the markings 24 and 24b, and the shank portion 61 is inserted so as not to rotate.

  Thereafter, when the shrink-fit tool holder 20 is pulled out of the shrink-fit heater 80 and the shrink-fit tool holder 20 is cooled, the shank portion 61 of the blade 60 is chucked to the shrink-fit chuck portion by shrink fit. Further, the side lock bolts 23, 23 b are brought into contact with flat surfaces 62, 63 formed on the outer periphery of the rear end of the screwed shank portion 61, thereby preventing the cutter 60 from coming off and rotating.

  By the way, since the axial direction front-end | tip part of the shrink-fit type tool holder 20 will be covered with the shrink-fit type heating apparatus 80, it is difficult to visually recognize the side lock bolts 23 and 23b from the side which inserts the blade 60. FIG. The markings 24 and 24b can be visually recognized through the through-hole 85, but may be difficult to visually recognize depending on the tip shape of the blade. Then, it is difficult to insert the cylindrical shank portion 61 into the tool holding hole 122 so that the circumferential positions of the flat surfaces 62 and 63 and the circumferential positions of the side lock bolts 23 and 23b coincide with each other. There is room for improvement in efficiency.

  It is also conceivable that markings representing the circumferential positions of the side lock bolts 23 and 23b are conspicuously provided on the outer peripheral surface of the shrink-fit tool holder 20, but the shrink-fit heater 80 is a shrink-fit type. Since the entire circumference of the tip region of the tool holder 20 is covered, it is difficult to visually recognize the outer peripheral surface and the marking of the shrink-fit tool holder 20 from the side into which the shank portion 61 of the blade 60 is inserted.

  Therefore, in order to overcome such difficulty, the present inventor has a fixing portion that is detachably fixed to the outer periphery of the shrink-fit tool holder, and extends in the radial direction of the shrink-fit tool holder that is provided on the fixing portion. It came to invent the circumferential position indicator provided with the display part which displays the predetermined circumferential direction position of a fitting tool holder.

  According to the circumferential position indicator of the present invention, the axial tip of the shrink-fit tool holder is covered by the shrink-fit heating device, and the marking attached to the shrink-fit tool holder cannot be visually recognized. Alternatively, even if the retainer / rotation prevention mechanism of the shrink-fit type tool holder cannot be visually confirmed, if the display portion of the circumferential position indicator is aligned with the retainer / rotation prevention mechanism, this display portion prevents the retainer. / The position in the circumferential direction of the detent mechanism can be known. Therefore, when inserting the shank portion of the cutter into the shrink-fit tool holder in the shrink fitting operation of the cutter, the circumferential position of the engaged portion is adjusted by aligning the engaged portion of the shank portion with the display portion of the circumferential position device. Consistent with the locking / rotating mechanism. Therefore, the work efficiency of chucking is improved. The circumferential position indicator may be ring-shaped, U-shaped, C-shaped, or the like.

  It is preferable that the display unit is closer to the retaining / rotating mechanism, and it is most preferable that the display unit is adjacent. However, as another embodiment, the display unit may be provided slightly away from the outer diameter side of the shrink-fit tool holder. As a preferred embodiment, it may be provided on one side and the other side of the fixed portion with respect to the axial direction of the shrink-fit tool holder. As one embodiment, the fixed portion is a ring having a center hole that receives the shrink-fit tool holder, a through hole that penetrates the ring in a radial direction, a female screw formed on an inner peripheral surface of the through hole, A set screw that is screwed into the female screw is further provided. According to this embodiment, by tightening the set screw, it can be fixed to the outer periphery of the shrink-fit tool holder so that the ring is not displaced.

  The form of the display unit is not particularly limited. The display part is, for example, a marking or a protrusion printed or engraved on one end face and the other end face of the fixed part in the axial direction of the shrink-fit tool holder. As another embodiment, the display unit protrudes from the fixed unit and extends in the axial direction of the shrink-fit tool holder. According to this embodiment, a display part can be closely approached to the shank part of a blade. Therefore, it becomes easy to match the flat surface of the shank portion to the display portion when inserting the shank portion of the blade into the shrink-fit tool holder in the shrink fitting operation of the blade.

  As described above, according to the present invention, the working time of the shrink fitting work is shortened as compared with the conventional shrink fitting tool holder.

1 is an overall view showing a shrink-fit tool holder according to a first embodiment of the present invention. It is a longitudinal cross-sectional view which expands and shows the front-end | tip area | region of 1st Embodiment. It is a front view which shows the axial direction front-end | tip part of 1st Embodiment. It is a longitudinal cross-sectional view which expands and shows the front-end | tip area | region of 1st Embodiment. It is a general view which shows the cutter cut by 1st Embodiment. It is a general view which shows the cutter of a modification. It is a cross-sectional view which shows 1st Embodiment with the rear-end part of a blade shank part. It is a longitudinal cross-sectional view which expands and shows the front-end | tip area | region of the shrink fitting tool holder which becomes 2nd Embodiment of this invention. It is a front view which shows the axial direction front-end | tip part of 2nd Embodiment. It is a longitudinal cross-sectional view which expands and shows the front-end | tip area | region of 2nd Embodiment. It is a whole view which shows the cutter cut by 2nd Embodiment. It is a cross-sectional view which shows 2nd Embodiment with the rear-end part of a blade shank part. It is a perspective view which shows the circumferential direction position indicator which becomes one Embodiment of this invention. This is shown schematically. It is a figure which shows typically the shrink-fitting operation | work by the circumferential direction position indicator of the embodiment. It is a figure which shows typically the shrink-fitting operation | work by the circumferential direction position indicator of the embodiment. It is a top view which shows typically the circumferential direction position indicator which becomes the other modification of this invention. It is a figure which shows typically the shrink-fitting work of a reference example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall view showing a shrink-fit tool holder according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the tip region of the first embodiment, and shows a state taken along the line II-II in FIG. FIG. 3 is a front view showing the tip portion in the axial direction of the first embodiment. For reference, in FIG. 2, the cutting tool inserted into the tool holding hole of the shrink-fit tool holder is indicated by a virtual line. The shrink-fit tool holder 10 includes a holder body 11 and side lock bolts 23 as main components. As shown in FIG. 3, a marking 24 that indicates the circumferential position of the retaining mechanism and / or the rotation preventing mechanism of the holder body 11 is provided on the front end surface of the holder body 11. The operator can determine the circumferential position of the retaining mechanism and the rotation preventing mechanism from the front end side of the shrink-fit tool holder 10 during the shrink-fitting operation. The marking 24 will be described in detail later.

  The metal holder main body 11 extends along an axis O indicated by a one-dot chain line, and a shrink-fit tool attaching / detaching portion 12 for chucking a cutter in the tip end region of the holder main body 11 in the axis O direction, and an axis O of the holder main body 11. And a mounting portion 13 mounted on the spindle of the machine tool in the rear end region. A large-diameter flange portion 14 is formed in the center portion of the holder main body 11 in the direction of the axis O so as to protrude from the tool attaching / detaching portion 12 and the mounting portion 13 in the outer diameter direction. A V-shaped groove 142 extending in the circumferential direction is formed on the outer peripheral edge of the flange portion 14.

  The mounting portion 13 has a shape that fits into a main shaft of a machine tool (not shown), and the outer peripheral surface of the mounting portion 13 of this embodiment is formed in a taper that decreases in radius toward the rear end in the axial direction. The mounting portion 13 is formed with a pull stud attachment hole 132 extending along the axis O that becomes the center of the holder body 11. A female thread 132t is formed on the inner periphery of the rear end of the pull stud mounting hole 132, and the female thread 132t extends from the rear end of the holder body 11 in the axis O direction toward the front end side in the axis O direction. The bottom of the pull stud mounting hole 132 is connected to the communication hole 133. The communication hole 133 extends along the axis O, and is connected to an intermediate hole 123 described later on the tip side in the axis O direction.

  A pull stud with a hole (not shown) is screwed into the female screw 132t, and the pull stud with the hole is pulled backward, so that the mounting portion 13 is securely mounted on the center through coolant main shaft of the machine tool. Then, cutting fluid or cleaning fluid flows from the center through coolant main shaft into the holed pull stud. Accordingly, the cutting fluid hole of the holed stud stud, the pull stud mounting hole 132, the communication hole 133, and the intermediate hole 123 serve as a liquid passage.

  The tool attaching / detaching portion 12 has a thick cylindrical shape made of metal with an opening in the axial direction, and has an outer peripheral surface 12g and an inner peripheral surface 12h. The inner peripheral surface 12h defines a tool holding hole 122 that extends along the axis O from the axial front end toward the axial rear end. As indicated by a two-dot chain line in FIG. 2, the shank portion 61 of the blade 60 is inserted into the tool holding hole 122 as indicated by a two-dot chain line in FIG. 2. The inner peripheral surface 12h of the tool holding hole 122 has an effective grasping length L of a predetermined dimension, and its inner diameter is slightly smaller than the outer diameter of the shank portion of the cutter inserted into the tool holding hole 122 (shank portion outer dimension− 0.03 mm or more and -0.025 mm or less). For example, when the outer diameter of the shank portion 61 is 20.00 mm, the inner diameter of the inner peripheral surface 12 h is 20.00−0.03 mm or more and 20.00−0.025 mm or less in a cooled state where the shank portion 61 is not inserted. It is. However, when the tool attaching / detaching portion 12 is sufficiently heated, the inner diameter of the inner peripheral surface 12h becomes slightly larger than the outer diameter of the shank portion of the cutter.

  The tool holding hole 122 is connected to the large diameter portion 122b of the tool holding hole on the bottom side. 2, the rear end portion of the shank portion 61 is inserted into the large diameter portion 122b. Even in the state where the tool attaching / detaching portion 12 is cooled, the inner diameter of the large diameter portion 122b is larger than the outer diameter of the shank portion of the cutter inserted into the tool holding hole 122. The large diameter portion 122b extends along the axis O, and is connected to the small diameter portion 122s of the tool holding hole on the rear end side in the axis O direction.

  As shown by a two-dot chain line in FIG. 2, the rear end portion of the shank portion 61 is inserted into the small diameter portion 122s. Even in the state where the tool attaching / detaching portion 12 is cooled, the inner diameter of the small diameter portion 122s is slightly larger than the outer diameter of the shank portion of the cutter (range of the shank portion outer dimension + 0.01 mm or more + 0.02 mm or less). For example, when the outer diameter of the shank portion 61 is 20.00 mm, the inner diameter of the small diameter portion 122s is 20.00 + 0.01 mm or more and 20.00 + 0.02 mm or less. The small diameter portion 122s extends along the axis O, and is connected to the intermediate hole 123 on the rear end side in the axis O direction. The inner peripheral surface of the small diameter portion 122s is polished. When the rear end portion of the shank portion 61 is pressed in the inner diameter direction by a side lock bolt 23 described later, the outer peripheral surface of the rear end portion of the shank portion 61 is received at a position 180 degrees away from the side lock bolt 23 in the circumferential direction.

  The inner diameter of the intermediate hole 123 is slightly larger than the inner diameter of the small diameter portion 122s. The intermediate hole 123 extends along the axis O and is connected to the tip of the communication hole 133 on the rear end side in the axis O direction. Since the intermediate hole 123 has an inner diameter larger than that of the communication hole 133, an annular step 124 is formed at the connection point between the intermediate hole 123 and the communication hole 133 so as to be directed to the tip side in the axis O direction. A female screw 133 t is formed on the inner periphery of the communication hole 133. The female screw 133t is disposed on the front end side in the axis O direction and is adjacent to the annular step 124. The intermediate hole 123 accommodates a stopper 25 described later. The stopper 25 has a flat front end surface 251 and a flat rear end surface 252. The annular step 124 abuts against the rear end surface 252 of the stopper 25 to restrict the backward movement of the stopper 25.

  The outer peripheral surface 12g of the tool attaching / detaching portion 12 is slightly tapered so as to become thinner toward the front end side in the axis O direction. The tool attaching / detaching portion 12 has an effective grasping length L of at least a predetermined dimension, and when heated, the inner diameter of the tool holding hole 122 is expanded by thermal expansion and becomes slightly larger than the outer diameter of the shank portion of the blade.

  A through hole 22 extending through the holder body 11 in the radial direction is formed on the rear end side of the tool attaching / detaching portion 12. The outer peripheral surface of the holder main body 11 has a taper shape with a gentler gradient than the outer peripheral surface 12 g on the rear end side in the axis O direction with respect to the through hole 22. The inner diameter end of the through hole 22 is connected to the small diameter portion 122s. Or it connects with small diameter part 122s and large diameter part 122b. The inner diameter end of the through hole 22 is located closer to the rear end side in the axis O direction than the outer diameter end of the through hole 22. For this reason, the through hole 22 extends with an inclination of 5 degrees with respect to a straight line orthogonal to the axis O. Or the through-hole 22 inclines and extends by the predetermined angle included in the range of 1 degree or more and 10 degrees or less. A marking 24 is provided at the tip of the outer peripheral surface 12 g at the same circumferential position as the through hole 22. The marking 24 may be engraved such as a concave portion, a convex portion, or printed. The marking 24 is further provided on the front end surface of the holder main body 11, that is, the front end surface of the tool attaching / detaching portion 12. Thereby, the circumferential position of the through hole 22 is easily visually recognized from the tip side of the tool holder 10. The marking 24 may also be formed on the outer peripheral surface of the holder main body 11, for example, the outer peripheral surface of the tip end region of the holder main body 11 as shown in the figure.

  A female screw 221 is formed on the inner peripheral surface of the through hole 22, and the side lock bolt 23 is screwed together. The side lock bolt 23 has a flat holding surface 231 orthogonal to the axis of the side lock bolt 23 at the front end and a polygonal hole 232 for engaging with a wrench at the rear end. When a wrench (not shown) is engaged with the polygonal hole 232 and tightened and rotated so as to screw the side lock bolt 23, the side lock bolt 23 advances toward the small diameter portion 122s. Conversely, when the side lock bolt 23 is loosened and rotated, the side lock bolt 23 moves backward from the small diameter portion 122s. The holding surface 231 is directed toward the inner diameter side of the holder body 11, and the polygonal hole 232 is directed toward the outer diameter side of the holder body 11. The through hole 22 and the side lock bolt 23 constitute a side lock type attaching / detaching portion 21 for chucking the blade.

  The pressing surface 231 may be formed on the main body of the side lock bolt 23, but in the first embodiment, the side lock bolt 23 includes a bolt main body 233 and a pressing member 234. The bolt body 233 has a polygonal hole 232 at the rear end and a male screw 235 on the outer peripheral surface. A spherical recess is formed at the tip of the bolt body 233, and a ball-shaped pressing member 234 is fitted into the recess. The pressing member 234 has a flat pressing surface 231 formed at the tip thereof. Thus, since the pressing member 234 is supported by the bolt body 233 on the spherical surface, the pressing surface 231 can rotate around the central axis of the bolt main body 233 and be inclined with respect to the central axis of the bolt main body 233. Can do. Therefore, the direction of the pressing member 234 can be freely changed with respect to the bolt body 233. Further, the pressing member 234 may be attached to the bolt main body 233 as long as the direction can be freely changed as shown in FIG.

  The shrink-fit tool holder 10 according to the first embodiment further includes a preload bolt 27 that applies preload to a shank portion of a cutter inserted into the tool holding hole 122. The preload bolt 27 is screwed with the female screw 133t of the communication hole 133, and can advance and retreat in the direction of the axis O. A flat pressing surface 271 orthogonal to the axis O is formed at the tip of the preload bolt 27, and the pressing surface 271 contacts the stopper 25. A polygonal hole 272 for engaging with the wrench is formed at the rear end of the preload bolt 27. When a wrench (not shown) is inserted into the pull stud mounting hole 132 and engaged with the polygonal hole 272 and tightened and rotated so that the preload bolt 27 is screwed, the preload bolt 27 advances toward the intermediate hole 123. Conversely, when the preload bolt 27 is loosened and rotated, the preload bolt 27 moves backward from the intermediate hole 123. The preload bolt 27 is screwed in the distal direction, thereby pressing the stopper 25 in the distal direction.

  Next, the cutter that is chucked on the shrink-fit tool holder 10 will be described.

  FIG. 5 is a side view showing a cutter according to an embodiment of the present invention. The steel blade 60 has a super steel alloy blade 60b in the axial front end region, a shank portion 61 in the axial rear end region, and extends along the axis indicated by the alternate long and short dash line. The shank portion 61 is basically a cylindrical shape having a circular cross section with a constant radius. However, a flat surface 62 is formed at one place in the circumferential direction on the outer periphery of the rear end portion of the shank portion 61 by cutting. Of the shank portion 61, the length dimension of the cylindrical region 61c on the tip side of the flat surface 62 has at least an effective grasping length L and an outer peripheral surface having a constant radius. The blade 60 is an end mill, but may be a drill or a reamer.

  The flat surface 62 is disposed at the rear end portion in the axial direction of the shank portion 61, and is adjacent to the rear end surface 64 that is a flat surface orthogonal to the axial line of the shank portion 61. The flat surface 62 is not parallel to the axis O of the shank portion 61 but is slightly inclined at a predetermined angle so as to be directed toward the distal end side of the blade 60. The predetermined angle is 5 degrees with respect to the axis of the shank portion 61. Alternatively, the flat surface 62 is a surface inclined within a range of 1 degree to 10 degrees. The predetermined angle of the flat surface 62 may correspond to the inclination angle of the through hole 22 described above.

  Next, the chucking of the blade 60 will be described.

  At the time of chucking, the tool attaching / detaching portion 12 is heated to a predetermined temperature, the diameter of the tool holding hole 122 is expanded by thermal expansion, and the shank portion 61 of the cutter 60 is moved from the tip side of the shrink-fit tool holder 10 to the tool holding hole 122. By plugging in. When inserting, the flat surface 62 of the shank part 61 is matched with the marking 24 of the tool attaching / detaching part 12. By firmly inserting the shank portion 61, the rear end face 64 of the shank portion 61 comes into contact with the stopper 25. The stopper 25 defines the position in the axis O direction of the shank portion 61 of the cutter 60 inserted into the tool holding hole 122. The stopper 25 is a member different from the holder main body 11. However, as a modification (not shown), the stopper 25 may be integrally formed with the holder main body 11. Alternatively, as a modification (not shown), the stopper 25 may not be installed, and the pressing surface 271 of the preload bolt 27 may be brought into contact with the rear end surface 64 of the shank portion 61 described later. In such a modification, the preload bolt 27 serves as a stopper.

  After that, when the tool attaching / detaching portion 12 is cooled and thermally contracted, the tool holding hole 122 is reduced in diameter, and the inner peripheral surface 12h uniformly tightens the outer peripheral surface of the shank portion 61 over the entire periphery, thereby effectively grasping the shank portion 61. Grasp closely and firmly over the length L. Further, the shank part 61 is centered so that the axis of the shank part 61 coincides with the axis O of the shrink-fit tool holder 10.

  Next, the side lock bolt 23 of the side lock type attaching / detaching portion 21 is screwed toward the small diameter portion 122 s, and the pressing surface 231 of the side lock bolt 23 comes into surface contact with the flat surface 62 of the shank portion 61. As a result, the shank portion 61 is prevented from coming off and prevented from rotating. At this time, as indicated by an arrow in FIG. 7, the pressing surface 231 at the tip of the side lock bolt 23 presses the flat surface 62, and the rear end portion of the shank portion 61 receives a pressing force in the inner diameter direction. At the same time, the inner peripheral surface of the small diameter portion 122 s comes into surface contact with the outer peripheral surface of the rear end portion of the shank portion 61 to receive the pressing force from the side lock bolt 23. Specifically, as indicated by arrows in FIG. 7, the inner peripheral surface of the small diameter portion 122 s is counteracted in the inner diameter direction at the rear end portion outer peripheral surface of the shank portion 61 at a position 180 degrees away from the through hole 22 in the circumferential direction. Is granted. Thus, the axis of the shank portion 61 is held so as not to deviate from the axis O of the tool holder body.

  Next, the bolt 27 is screwed in, a preload in the front end direction is loaded on the stopper 25, and the rear end face 64 of the shank portion 61 is pressed through the stopper 25. This not only increases the surface pressure between the front end surface 251 of the stopper 25 and the rear end surface 64 of the shank portion 61, but also increases the surface pressure between the pressing surface 231 of the side lock bolt 23 and the flat surface 62 of the shank portion 61. As a result, the retaining effect and the detent effect of the side lock type attaching / detaching portion 21 are improved.

  When releasing the chucking of the blade 60, a procedure reverse to the procedure described above may be performed. When the bolt 27 is loosened and rotated, the side lock bolt 23 is loosened and rotated, the tool attaching / detaching portion 12 is heated to a predetermined temperature, the tool holding hole 122 is expanded, and the shank portion 61 is pulled out from the tool holding hole 122 in the distal direction. Good.

  The blade portion 60b of the blade 60 is regenerated by re-polishing when worn by use. If it does so, the blade length of the blade part 60b will become shorter than before grinding | polishing. Therefore, as shown in FIG. 4, the stopper 25 that is short in the direction of the axis O may be replaced with a long stopper 26. As a result, the re-polished blade portion 60b can be pulled out to the tip side and protrude from the tip of the shrink-fit tool holder by the same length as the new blade 60. In consideration of the fact that the flat surface 62 advances toward the tip of the axis O after re-polishing, the flat surface 62 is larger than the pressing surface 231 and may be formed so as to expand toward the rear end of the axis O when new. desirable.

  As a modification of the cutter 60 shown in FIG. 5, as shown in FIG. 6, a cutter 65 further provided with a liquid passage 66 may be chucked on the shrink-fit tool holder 10. The liquid passage 66 extends in the axial direction from the front end of the blade 65 to the rear end face 64. Since the other configuration of the blade 65 is the same as that of the blade 60 described above, a common reference numeral is assigned and description thereof is omitted. A communication passage 253 that penetrates in the direction of the axis O is formed in the stopper 25. The bolt 27 is also formed with a communication passage 273 that penetrates in the direction of the axis O. The communication passages 253 and 273 extend along the axis O. When the front end surface 251 of the stopper 25 is in surface contact with the rear end surface 64 of the shank portion 61, the communication passages 253 and 273 and the rear end opening of the liquid passage 66 are connected to each other.

  While the shrink-fit tool holder 10 rotates at high speed about the axis O and cuts a workpiece (not shown) with the blade 65, the rear of the liquid passage 66 passes through the communication passages 273 and 253 from the connection hole 133 of the holder body 11. Cutting fluid is supplied to the end. The cutting fluid flows through the liquid passage 66 and is ejected from the tip (not shown) of the blade 65 to reach the workpiece.

  By the way, the shrink-fit tool holder 10 of the first embodiment is provided in the holder main body 11 having a tool holding hole 122 extending from the front end in the axis O direction toward the rear end side in the axis O direction, and in the front end region of the holder main body 11. The cylindrical area 61c of the shank 61 of the cutter 60 inserted into the tool holding hole 122 is grasped and centered by shrink fitting over a predetermined effective grasping length L so that the axis of the cutter 60 coincides with the axis O of the holder body. A cylindrical tool attaching / detaching portion 12, a through hole 22 provided on the rear end side in the axis O direction from the tool attaching / detaching portion 12, and extending from the outer peripheral surface of the holder body 11 to the large diameter portion 122b of the tool holding hole, and the through hole The side lock bolt 23 is screwed to the side lock bolt 23, and a flat pressing surface 231 provided at the tip of the side lock bolt 23 is provided on the outer periphery of the rear end portion of the shank portion 61. It provided with a side locking detachable portion 21 to abut against the flat surface 62 which is inclined that. The through hole 22 is inclined and extended at a predetermined angle of 1 degree or more and 10 degrees or less with respect to a direction perpendicular to the axis O so that the outer diameter side is closer to the distal end side in the axis O direction than the inner diameter side. When the cylindrical region 61c of the shank portion 61 of the blade 60 is grasped and centered by the tool attaching / detaching portion 12, it is screwed toward the small diameter portion 122s so that the holding surface 231 at the tip of the side lock bolt is inclined at the rear end of the shank portion. The flat surface 62 is brought into contact. The shrink-fit tool holder 10 chucks the shank portion 61 of the blade 60 by using the tool attaching / detaching portion 12 and the side lock attaching / detaching portion 21.

  According to the first embodiment, since the tool attaching / detaching portion 12 centers the shank portion 61 of the cutter 60, the axis O of the holder main body 11 and the axis of the cutter 60 coincide with each other, and the cutter 60 can be grasped with high accuracy. Can do. Further, a strong frictional force is exerted over the effective grasp length L between the inner peripheral surface 12h of the tool attaching / detaching portion 12 and the outer peripheral surface of the cylindrical region 61c of the shank portion 61, and the cutter 60 is easily pulled out during the cutting process. Absent. Thereafter, the side lock bolt 23 prevents the shank portion 61 of the blade 60 from coming off and preventing it from rotating as a final tightening function. The shrink-fitting tool attaching / detaching part 12 and the side lock attaching / detaching part 21 prevent the chucking from loosening even if the difficult-to-cut material is cut for a long time.

  Further, the side lock bolt 23 of the first embodiment is formed with a bolt main body 233 that is screwed into the through hole 22 and a pressing surface 231 that comes into contact with the flat surface 62 of the blade 60, and a pressing surface 231 at the tip of the bolt main body 233. The pressing member 234 is attached so that the orientation of the can be changed freely. According to such an embodiment, even if the advancing direction of the side lock bolt 23 is not perpendicular to the flat surface 62 of the shank portion 61, if the side lock bolt 23 is screwed and rotated in the tightening direction, the pressing surface of the end of the side lock bolt 231 changes its direction following the flat surface 62 of the shank portion 61 and comes into surface contact with the flat surface 62. Therefore, the side lock bolt 23 firmly presses the flat surface 62 of the shank portion 61, and the shank portion 61 can be chucked more reliably.

  The shrink-fit tool holder 10 of the first embodiment further includes a stopper 25 that is provided on the bottom side of the tool holding hole 122 and that defines the axial position of the shank portion 61 inserted into the tool holding hole 122. Thus, the flat surface of the shank portion 61 can be reliably pressed by the pressing surface 231 without the cutter 60 retreating carelessly along the tool holding hole 122.

  Further, the shrink-fit tool holder 10 of the first embodiment is screwed into a connecting hole 133 extending from the bottom of the tool holding hole 122 to the rear end side in the axial direction of the holder body 11 and a female screw 133t of the connecting hole 133. Since the preload bolt 27 for applying a pressing force in the distal direction to the 60 shank portions is further provided, the surface pressure increases between the pressing surface 231 of the side lock bolt 23 and the inclined flat surface 62 of the shank portion 61. . Therefore, the retaining effect and the detent effect by the side lock type attaching / detaching portion 21 are strong.

  Further, the stopper 25 and the preload bolt 27 of the first embodiment have connecting passages 253 and 273 penetrating in the direction of the axis O, and the connecting passage 253 is a liquid passage 66 provided in the shank portion of the blade 65 (FIG. 6). Since it is configured to be connected to the rear end opening, the cutting fluid flows through the shrink-fit tool holder 10 and the blade 65 and is supplied to the workpiece, thereby improving the cutting performance.

  Further, the blade 60 of the first embodiment includes a shank portion 61 that is inserted into the tool holding hole 122 of the shrink-fit tool holder 10, and a blade portion 60 b that extends from the shank portion 61 toward the distal end side in the axial direction. The shank portion 61 is formed on the outer periphery of the rear end portion of the shank portion 61 and is in contact with the pressing surface 231 of the side lock bolt 23. The shank portion 61 is formed on the front end side of the flat surface 62 and is a shrink-fit type tool attachment / detachment. And a cylindrical region 61c having a length equal to or longer than a predetermined effective grasping length L to be fastened to the portion 12. The flat surface 62 is inclined so as to be directed toward the distal end side in the axial direction at a predetermined angle of 1 to 10 degrees with respect to the axis of the shank portion 61. As a result, the shank portion 61 is grasped and centered with a sufficient effective grasping length L by the tool attaching / detaching portion 12 of the shrink-fit tool holder 10. Then, the side lock type attaching / detaching portion 21 of the shrink-fit tool holder 10 is securely prevented from coming off and rotating.

  In addition, since the cutting tool 65 of the modified example further includes a liquid passage 66 extending from the shank part 61 to the cutting part 60b, the cutting fluid flows through the cutting tool 65 and is supplied to the cutting portion of the workpiece, thereby improving the cutting performance.

  Further, according to the shrink-fit tool holder 10 of the first embodiment, the tool holding hole 122 extending in the axis O direction from the front end to the rear end side in the axis O direction, and the cylindrical portion that defines the tool holding hole 122. The holder main body 11 having the tool attaching / detaching portion 12 for shrink fitting the shank portion 61 of the cutter 60 inserted into the tool holding hole 122, and the cutter provided at a predetermined circumferential position of the holder main body 11 and inserted into the tool holding hole 122. Of the side lock type attaching / detaching portion 21 as a retaining / rotating prevention mechanism that engages with the shank portion 61 of the 60 and restricts the axial movement and rotation of the shank portion 61, and the axial end surface of the holder body 11 A side lock type attaching / detaching portion 21 and a marking 24 provided at a corresponding circumferential position. Thereby, the position of the circumferential direction of the side lock type attaching / detaching portion 21 can be determined from the front end side of the shrink fitting tool holder in the shrink fitting work. Since the marking 24 indicates the circumferential position of the side lock type attaching / detaching portion 21, when inserting the shank portion 61 of the blade 60 into the tool holding hole 122 of the shrink-fit tool holder 10, the operator can set a flat surface on the outer periphery of the shank portion 61. The circumferential position of 62 (the engaged portion) may be inserted in accordance with the marking 24 at the tip of the shrink-fit tool holder 10, and the working time of the shrink-fit operation is shortened.

  Further, according to the shrink-fit tool holder 10 of the first embodiment, as a retaining / rotating prevention mechanism, a female screw 221 extending from the outer peripheral surface of the holder main body 11 to the small diameter portion 122 s of the tool holding hole, and a screw threaded engagement with the female screw 221 Includes a side lock type attaching / detaching portion 21 including a side lock bolt 23 that contacts the shank portion 61 of the blade 60. Thus, when the side lock bolt 23 is tightened and rotated so as to be screwed in, the tip of the side lock bolt 23 comes into contact with the shank portion 61 of the blade 60, and the movement and rotation of the shank portion 61 in the axis O direction can be restricted. it can.

  Although the details will be described later with reference to FIG. 15, the tip of the shrink-fit tool holder 10 is covered and heated by the shrink-fit heating device 80, and the shank portion 61 of the tool 60 is provided in the shrink-fit heating device 80. Is inserted into the tool holding hole 122 of the shrink-fit tool holder 10. The through hole 85 has a slightly larger diameter than the shank portion 61 of the tool 60, and the tip surface of the shrink-fit tool holder 10 can be seen through the through hole 85 from the tip side in the axis O direction. According to the first embodiment, since the marking 24 is provided adjacent to the tool holding hole 122, even if the through hole 85 of the shrink-fitting heating device 80 is relatively small, from the front end side in the axis O direction. The marking 24 can be visually recognized through the through hole 85.

  Moreover, according to 1st Embodiment, since the marking 24 is provided also in the circumferential direction position corresponding to the side lock type attachment / detachment part 21 among the outer peripheral surfaces of the holder main body 11, marking 24 is provided from the outer side of the shrink-fit tool holder 10. Can be visually recognized.

  Next, a second embodiment of the present invention will be described. FIG. 8 is an enlarged longitudinal sectional view showing the tip region of the shrink-fit tool holder 20 according to the second embodiment of the present invention, and shows a state in which a short stopper is used. FIG. 9 is a front view showing the tip portion in the axial direction of the second embodiment. FIG. 10 is an enlarged longitudinal sectional view showing the tip region of the second embodiment, and shows a state in which a long stopper is used. For reference, FIGS. 8 and 10 show a blade inserted into the tool holding hole of the shrink-fit tool holder. About 2nd Embodiment, about the structure which is common in 1st Embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted, and a different structure is demonstrated below. The shrink-fit tool holder 20 of the second embodiment has two through holes 22 and 22b and two side lock bolts 23 and 23b. As shown in FIG. 9, a marking 24 is disposed at the distal end portion of the tool attaching / detaching portion 12 at a circumferential position corresponding to the through hole 22 as in the first embodiment described above. The marking 24 is provided on both the outer peripheral surface 12g and the front end surface of the tool attaching / detaching portion 12. Further, a marking 24b is provided at a circumferential position corresponding to the through hole 22b. Especially in 2nd Embodiment, as shown in FIG. 9, the markings 24 and 24b are provided in the front end surface of the tool attachment / detachment part 12. As shown in FIG.

  The 1st through-hole 22 and the 2nd through-hole 22b are arrange | positioned at two places away by the predetermined angle of 60 to 120 degree | times in the circumferential direction of a holder main body. The first through hole 22 and the second through hole 22b of the second embodiment are separated by 90 degrees in the circumferential direction. Moreover, the 1st through-hole 22 and the 2nd through-hole 22b are the same shape, the same dimension, and the same inclination angle. The second side lock bolt 23b is screwed into the second through hole 22b so that the first side lock bolt 23 is screwed into the first through hole 22.

  FIG. 11 is an overall view showing the cutter 70 chucked in the second embodiment. The blade 70 also has a first flat surface 62 and a second flat surface 63 that are formed at two locations separated by a predetermined angle of 60 degrees or more and 120 degrees or less in the circumferential direction of the shank portion 61. Specifically, the first flat surface 62 and the second flat surface 63 are separated by 90 degrees in the circumferential direction. 90 degrees here is an angle from the circumferential center of the first flat surface 62 to the circumferential center of the second flat surface 63.

  The inclination angle of the second flat surface 63 with respect to the axis of the shank portion 61 is the same as that of the first flat surface 62. The shape and dimensions of the second flat surface 63 are also the same as those of the first flat surface 62. The first flat surface 62 is in contact with the pressing surface 231 of the first side lock bolt 23, and the second flat surface 63 is in contact with the pressing surface 231 of the second side lock bolt 23b. At this time, as indicated by an arrow in FIG. 12, the pressing surface 231 at the tip of the first side lock bolt 23 presses the flat surface 62, and the rear end of the shank portion 61 is pressed from the first side lock bolt 23 in the inner diameter direction. Receive. At the same time, the inner peripheral surface of the small-diameter portion 122 s comes into surface contact with the outer peripheral surface of the rear end portion of the shank portion 61 to receive the pressing force from the first side lock bolt 23. Specifically, as indicated by arrows in FIG. 12, the inner peripheral surface of the small diameter portion 122 s is the reaction force in the inner diameter direction on the outer peripheral surface of the rear end portion of the shank portion 61 at a position 180 degrees away from the through hole 22 in the circumferential direction. Is granted. Further, the pressing surface 231 at the tip of the second side lock bolt 23b presses the flat surface 63 in the inner diameter direction, and the inner peripheral surface of the small diameter portion 122s is behind the shank portion 61 at a position 180 degrees away from the through hole 22b in the circumferential direction. A reaction force in the inner diameter direction is applied to the outer peripheral surface of the end. Thus, the axis of the shank portion 61 is held so as not to deviate from the axis O of the tool holder body.

  By the way, the shrink-fit type tool holder 20 of 2nd Embodiment is the side lock type attaching / detaching part 21, and the side lock type attaching / detaching part 21 is separated in the circumferential direction of the holder main body 11 at a predetermined angle of 60 degrees or more and 120 degrees or less. The first and second through holes 22 and 22b are formed, the first side lock bolt 23 is screwed into the first through hole 22, and the second side lock bolt 23b is screwed into the second through hole 22b. As a result, the pressing force applied to the shank portion 61 by the first side lock bolt 23 and the pressing force applied to the shank portion 61 by the second side lock bolt 23b intersect each other, and the shank portion 61 is connected to the inner peripheral surface of the tool attaching / detaching portion 12. The centering accuracy of the blade 70 is maintained by suitably pressing to 12h. Further, since the two side lock bolts 23 and 23b are used, the pull-out function and the anti-rotation function are improved as compared with the case of one.

  Further, the blade 70 of the second embodiment has first and second flat surfaces 62 and 63 formed at two positions separated by a predetermined angle of 60 degrees or more and 120 degrees or less in the circumferential direction of the shank portion 61, and The first flat surface 62 contacts the pressing surface 231 of the first side lock bolt 23 of the second embodiment, and the second flat surface 63 contacts the pressing surface 231 of the second side lock bolt 23b of the second embodiment. . As a result, the pressing force applied to the first flat surface 62 and the pressing force applied to the second flat surface 63 intersect each other, and the shank portion 61 is suitably pressed against the inner peripheral surface 12h of the tool attaching / detaching portion 12, thereby cutting the tool. A centering accuracy of 70 is maintained. Further, since the two inclined flat surfaces are provided, the function of pulling out and preventing the shank 61 is improved.

  Next, the shrink fitting operation for shrink fitting the knife to the shrink fitting tool holder will be described.

  FIG. 13 is a perspective view showing a circumferential position indicator according to an embodiment of the present invention. FIG. 14 and FIG. 15 are diagrams schematically showing how the blade is shrink-fitted into the shrink-fit tool holder of the first embodiment described above using the circumferential position indicator of the same embodiment. It shows a state seen from the side of the tool holder. As shown in FIG. 14, the shrink-fit heating device 80 includes a main body 81. A first recess 84 is formed on one end surface 82 of the main body 81. The first recess 84 is a round hole with a bottom, and receives the tool attaching / detaching portion 12 that becomes the tip portion in the axial direction of the shrink fitting tool holder 10 from one side of the shrink fitting heating device 80. A heating part 81 t is disposed inside the main body 81 so as to surround the first recess 84, and the main body 81 heats the tool attaching / detaching part 12 in the first recess 84.

  A through hole 85 is formed in the other end surface 83 of the main body 81 so as to be coaxial with the first recess 84. The through hole 85 is a round hole having a smaller diameter than the first recess 84 and is connected to the bottom of the first recess 84. The through hole 85 receives the shank portion 61 of the blade 60 from the other side. Thus, the first recess 84 and the through hole 85 extend continuously and penetrate the main body 81. With respect to the penetration direction, the shrink-fit tool holder 10 is inserted and removed from one side, and the blade 60 is inserted and removed from the other side. In the following description, one side refers to the first recess 84 side as viewed from the through hole 85, and the other side refers to the through hole 85 side as viewed from the first recess 84, and is rearward with respect to the axial direction of the shrink-fit tool holder 10. It corresponds to the end side and the tip side, respectively.

  Next, a circumferential position indicator (hereinafter simply referred to as a ring) that displays the circumferential position of the side lock bolt of the shrink-fit tool holder will be described with reference to FIGS.

  The center hole 93 c of the ring 93 has an inner diameter corresponding to the outer diameter of the shrink-fit tool holder 10. The holder main body 11 is passed through the center hole 93c, the rear end region of the holder main body 11 protrudes from the ring 93 to one side, and the tip end region of the holder main body 11, that is, the tool attaching / detaching portion 12, extends from the ring 93 to the other side. Project to

  The ring 93 is formed with a female screw 94 extending through in the radial direction, and a set screw 95 is screwed into the female screw 94. The outer diameter of the ring 93 is larger than the width dimension of the shrink-fit heating device 80. For this reason, the outer peripheral part of the ring 93 protrudes from the side surface 81 s of the main body 81 of the shrink-fit heating device 80. A first display portion 86 and a second display portion 87 are provided on the outer peripheral portions of both end faces of the ring 93.

  The first display portion 86 is formed on one end surface 93 s of the ring 93 and is visible from one side of the main body 81 together with the first recess 84. The first display portion 86 indicates a predetermined circumferential position with respect to the center hole 93 c of the ring 93. The second display portion 87 is formed on the other end surface 93 t of the ring 93 and is visible from the other side of the main body 81 together with the through hole 85. The second display unit 87 is provided at the same circumferential position as the first display unit 86. The first display portion 86 is a groove grooved on the one end face 82, but it may be a marking or protrusion provided by another method such as printing. The same applies to the second display unit 87. The first display portion 86 and the second display portion 87 are provided at least on the outer diameter side of the ring 93, but may be provided on the inner diameter side.

  The operation of shrink-fitting the blade 60 to the shrink-fit tool holder 10 is performed according to the following procedure. First, the side lock bolt 23 of the shrink-fit tool holder 10 is loosened, and the shrink-fit tool holder 10 is passed through the center hole 93 c of the ring 93. At this time, the first display portion 86 is aligned with the side lock bolt 23. Then, the set screw 95 is tightened to fix the ring 93 to the outer periphery of the shrink-fit tool holder 10. For this reason, the ring 93 is also referred to as a fixed portion.

  The circumferential position of the side lock bolt 23 in the shrink-fit tool holder 10 is visible by the first display part 86 and the second display part 87. Moreover, it is visible from both sides of the shrink-fit tool holder 10 in the axial direction.

  Next, as shown in FIG. 15, the shrink-fit tool holder 10 is inserted into the first recess 84 from one side of the shrink-fit heater 80. Next, when the shrink-fit heating device 80 is energized to heat the shrink-fit tool holder 10 to a predetermined temperature, the tool holding hole 122 expands due to thermal expansion of the tool attaching / detaching portion 12. Next, the shank portion 61 of the blade 60 is inserted into the through hole 85 from the other side of the shrink-fit heating device 80. At this time, the flat surface 62 at the rear end of the shank part 61 is aligned with the second display part 87. The second display part 87 is visible from the other side of the shrink-fit heating device 80.

  Since the first display portion 86 and the second display portion 87 are provided at the same circumferential position, the flat surface 62 can face the tip of the side lock bolt 23, and the shank portion 61 is in the tool holding hole 122. Inserted properly. Next, when the energization of the shrink fitting heating device 80 is stopped and the tool attaching / detaching portion 12 is cooled, the tool holding hole 122 is reduced in diameter, and the shank portion 61 is chucked on the tool attaching / detaching portion 12, and the shrink fitting operation is performed. Complete.

  In addition, the operation | work which isolate | separates the tool attachment / detachment part 12 from the shank part 61 inserts the shrink-fit type tool holder 10 in the 1st recessed part 84 with the blade 60 mounted from one side of the shrink-fit type heating device 80, and shrink-fit type heating. The device 80 may be energized to heat the shrink-fit tool holder 10 to a predetermined temperature.

  According to the present embodiment, even when the tool attaching / detaching portion 12 is covered with the shrink-fit heating device 80 and the marking 24 cannot be visually recognized, the first display portion 86 and the second display portion 87 are targeted, and the side The circumferential positions of the lock bolt 23 and the flat surface 62 can be matched. Therefore, the shrink fitting operation can be completed in a short time.

  As a modification example instead of the second display portion 87, a third support portion 90 extending in the axial direction of the shrink-fit tool holder 10 may be provided on the ring 93 as indicated by a virtual line in FIG. 15. The base portion 90 m of the third support portion 90 is coupled to the outer peripheral portion of the ring 93. The third support portion 90 protrudes from the other end surface 93t and extends beyond the one end surface 82 and the other end surface 83 of the shrink-fit heating device 80, and the tip end portion 90n of the third support portion 90 is bent and extends in the inner diameter direction. . The distal end portion 90n is disposed at the same circumferential position as the first display portion 86.

  Next, another modification of the present invention will be described. FIG. 16 is a plan view schematically showing a circumferential position indicator according to another modification of the present invention. With respect to other modified examples, components that are the same as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and different components are described below. In another modification, it is used for a shrink-fit tool holder 10 having two side lock bolts 23, 23 b, and has first display portions 86, 88 at two locations on one end face of the ring 93. The first display portions 86 and 88 are arranged so as to correspond to the circumferential positions of the side lock bolts 23 and 23b, respectively. As shown in FIGS. 8, 10, and 12, when the side lock bolts 23 and 23b are arranged at a predetermined angle, the first display portions 86 and 88 are also separated at the same angle. Has been placed. In FIG. 16, the first display portions 86 and 88 are arranged 90 degrees apart in the circumferential direction.

  A second display portion (same as 87 in FIG. 13) is provided at the same circumferential position as the first display portion 86 on the other end surface of the ring 93 on the back side of the paper surface of FIG. A second display portion is provided at the same circumferential position as 88.

  According to such another modification, even when the tool attaching / detaching portion 12 is covered with the shrink-fit heating device 80 and the markings 24, 24b (FIGS. 8 to 10) cannot be visually recognized, the first display portion 86 and With the second display portion 87 corresponding thereto as a target, the side lock bolts 23 and the flat surface 62 are aligned with each other in the circumferential direction, and the first display portion 88 and the second display portion corresponding thereto are targeted as side locks. The circumferential direction positions of the bolt 23b and the flat surface 63 can be matched.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range as the present invention or within an equivalent range.

  The shrink-fit tool holder and circumferential position indicator according to the invention are advantageously used in machine tools.

10 shrink-fit tool holder, 11 holder body, 12 tool attaching / detaching part,
12g outer peripheral surface, 12h inner peripheral surface, 122 tool holding hole,
122b Large diameter part of the tool holding hole, 122s Small diameter part of the tool holding hole,
123 intermediate hole, 124 annular step, 13 mounting part,
132 Pull stud mounting hole, 133 connecting hole, 133t female thread
14 flange, 142 V-groove,
21 side lock type attaching / detaching part, 22 (first) through hole,
22b 2nd through hole, 23 1st side lock bolt,
23b Second side lock bolt, 231 holding surface,
233 bolt body, 234 holding member, 24, 24b marking,
25, 26 stopper, 251 tip surface, 253 communication passage,
27 Preloading bolts, 271 holding surface,
273 communication passage, 60 blade, 60b blade
61 Shank part, 61c Cylindrical area, 62 (1st) flat surface
63 second flat surface, 64 rear end surface, 65 blade,
66 liquid passage, 70 blade, 80 shrink-fit heating device,
81 body, 82 one end face, 83 other end face,
84 1st recessed part, 85 Through-hole, 86,88 1st display part,
87 second display unit, 90 third display unit,
93 ring (circumferential position indicator), 93c center hole,
93s One end face, 93t The other end face, L Effective grasp length, O-axis line.

For this purpose, the shrink-fit tool holder according to the present invention includes a tool holding hole extending in the axial direction from the front end in the axial direction toward the rear end side, and a cylindrical portion that defines the tool holding hole. A holder main body having a shrink-fit detachable portion for shrink-fitting the shank portion of the cutter to be inserted, and the shank portion provided at a predetermined circumferential position of the holder main body and engaged with the shank portion of the cutter inserted into the tool holding hole. A retaining / rotating preventing mechanism that restricts movement and / or rotation of the tool in the axial direction of the tool holder, and a fixed circumferential position of the tool holder body that is detachably fixed to the outer periphery of a portion of the holder body that is different from the shrink fitting / removal part A circumferential position indicator .

According to the shrink-fit type tool holder of the present invention , since the circumferential position indicator is detachably fixed to the outer periphery of a portion of the holder main body different from the shrink-fit detachable portion, the circumferential position indicator is used. The circumferential position of the retaining / rotating mechanism can be determined from the tip side of the shrink-fit tool holder. Since the circumferential position indicator displays the circumferential position of the retainer / anti-rotation mechanism, when inserting the shank part of the blade into the tool holding hole of the shrink-fit tool holder, the operator must engage the engaged part on the outer periphery of the shank part. It is only necessary to insert the circumferential position in accordance with the marking on the circumferential position indicator, thereby shortening the working time for shrink fitting. The marking on the circumferential position indicator is not particularly limited, such as printing, protrusions, or recesses. The retaining / rotating prevention mechanism is provided at a position in the axial direction different from that of the shrink-fitting attachment / detachment portion. The shrink-fit detachable part may occupy the tip end region in the axial direction of the holder body. The retaining / rotating preventing mechanism may be provided at one place or a plurality of places on the holder body.

The engaged portion that is formed in the shank portion and engages with the retaining / rotating preventing mechanism is not particularly limited, and may be, for example, a concave portion or a flat surface. Side preferred omission as an embodiment stop / detent mechanism of the present invention, the internal thread extending from the outer peripheral surface of the holder body to the inner peripheral surface of the tool holding hole, screwed tip to the female screw abuts against the shank portion of the tool Including rock bolts. According to this embodiment, when the side lock bolt is tightened and rotated so as to be screwed in, the tip of the side lock bolt comes into contact with the shank portion of the cutter, and the axial movement and / or rotation of the shank portion can be restricted. it can. The number of side lock bolts may be one or more. The plurality of side lock bolts may be arranged away from each other in the axial direction or may be arranged away from each other in the circumferential direction. Of the shank portion of the blade, the shape of the contacted portion that contacts the side lock bolt is not particularly limited, but is preferably a recess or a flat surface formed on the outer peripheral surface of the shank portion.

The tip of the shrink-fit tool holder is heated by being covered with a shrink-fit heating device, and the shank portion of the tool passes through a through-hole provided in the shrink-fit heating device and becomes a tool holding hole of the shrink-fit tool holder. Plugged in. As a reference example, the holder body is provided with a marking adjacent to the tool holding hole .

The marking is not limited to the front end surface in the axial direction of the holder body. As a reference example , the marking is provided on the outer peripheral surface of the holder body at a circumferential position corresponding to the retaining / rotating preventing mechanism .

Therefore, in order to overcome such difficulty, the present inventor has a fixing portion that is detachably fixed to a portion of the outer periphery of the shrink fitting tool holder that is different from the shrink fitting fitting portion, and a shrink fitting that is provided on the fixing portion. The present invention has invented a circumferential position indicator that includes a display section that extends in the radial direction of the tool holder and displays a predetermined circumferential position of the shrink-fit tool holder.

For this purpose, the combined structure of the shrink-fit tool holder and circumferential position indicator according to the present invention comprises a tool holding hole extending in the axial direction from the front end in the axial direction toward the rear end, and a cylinder defining the tool holding hole. Jo moiety is a to the holder body has a shrink-fit detachable unit for shrink-fitting the shank portion of the tool to be inserted into the tool holding hole, and provided at a predetermined circumferential position of the holder main body, tool shank to be inserted into the tool holding hole A shrink-fitting tool holder having a retaining / rotating prevention mechanism that engages with the part and restricts axial movement and / or rotation of the shank part, and a part of the holder body that is different from the shrink-fitting attachment / detachment part. is detachably fixed to the outer periphery, it comprises a circumferential position indicator for indicating a predetermined circumferential position of the tool holder body.

According to the combined structure of the shrink-fit tool holder and the circumferential position indicator of the present invention, the circumferential position indicator is detachably fixed to the outer periphery of a portion of the holder body that is different from the shrink-fit attaching / detaching portion. The circumferential position indicator can be used to determine the circumferential position of the retainer / anti-rotation mechanism from the tip side of the shrink-fit tool holder. Since the circumferential position indicator displays the circumferential position of the retainer / anti-rotation mechanism, when inserting the shank part of the blade into the tool holding hole of the shrink-fit tool holder, the operator must engage the engaged part on the outer periphery of the shank part. It is only necessary to insert the circumferential position in accordance with the marking on the circumferential position indicator, thereby shortening the working time for shrink fitting. The marking on the circumferential position indicator is not particularly limited, such as printing, protrusions, or recesses. The retaining / rotating prevention mechanism is provided at a position in the axial direction different from that of the shrink-fitting attachment / detachment portion. The shrink-fit detachable part may occupy the tip end region in the axial direction of the holder body. The retaining / rotating preventing mechanism may be provided at one place or a plurality of places on the holder body.

Claims (6)

A tool holding hole extending in the axial direction from the front end to the rear end side in the axial direction, and a cylindrical part that defines the tool holding hole, and a shrink fit that shrinks a shank portion of a cutter inserted into the tool holding hole. A holder body having a detachable portion;
A retainer / anti-rotation mechanism that is provided at a predetermined circumferential position of the holder body and engages with a shank portion of a cutter inserted into the tool holding hole to restrict axial movement and / or rotation of the shank portion. When,
A shrink-fit tool holder, comprising a marking indicating a circumferential position corresponding to the retaining / rotating preventing mechanism on the axial front end surface of the holder body.   The retainer / anti-rotation mechanism includes a through-hole extending from an outer peripheral surface of the holder body to the tool holding hole, a female screw formed on an inner peripheral surface of the through-hole, and a screw threadedly engaged with the female screw, and a tip of the cutter The shrink-fit tool holder according to claim 1, further comprising a side lock bolt that abuts the shank portion.   The shrink-fit tool holder according to claim 1, wherein the marking is provided adjacent to the tool holding hole. A fixing portion that is detachably fixed to the outer periphery of the shrink-fit tool holder;
A circumferential position indicator, comprising: a display section provided on the fixed portion and extending in a radial direction of the shrink-fit tool holder, and displaying a predetermined circumferential position of the shrink-fit tool holder.   The said fixing | fixed part is a ring which has a center hole which receives the said shrink-fit type tool holder, and is further equipped with the internal thread extended through the said ring to radial direction, and the set screw screwed together in the said internal thread. The indicated circumferential position indicator.   6. The circumferential position indicator according to claim 4, wherein the display unit protrudes from the fixed unit and extends in an axial direction of the shrink-fit tool holder.

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