JP2017087384A - Tool holder, processing tool, and machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holder which can easily attach a processing tool to the tool holder, and can suppress the detachment of the processing tool from the tool holder at a stop of the rotation of a spindle, the processing holder and a machine tool.SOLUTION: A tool holder 50 of a machine tool 10 comprises: a tip face 64 for regulating the movement of a processing tool 16 to a tip side with respect to a holder main body 48 by contacting with the processing tool 16 by the action of an energization force of an energizing member 24 in a state that the processing tool 16 is inserted into an insertion hole 46, and rotated to a second rotation direction; and a first side face 66 for regulating the rotation of the processing tool 16 to a first rotation direction with respect to the holder main body 48 in a locked state that the movement of the processing tool 16 at the tip side is regulated by the tip face 64.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a processing tool having a blade portion on the tip side that rotates in a first rotation direction in accordance with rotation of a spindle to process a workpiece, a tool holder to which a shank portion of the processing tool can be attached and detached, and a machine tool.

  For example, Patent Document 1 discloses a configuration in which a retaining protrusion and a rotation-preventing protrusion are provided on the inner surface of a holding hole of a chuck portion in a tool holder that includes a chuck portion that holds a cutting tool by a shrink-fit method. ing. The retaining protrusion is positioned on the tip side (opening side into which the cutting tool is inserted) than the rotation preventing protrusion and is out of phase with the rotation preventing protrusion. On the outer peripheral surface of the cutting tool, a flat surface extending to the rear end along the axial direction and an annular groove continuous to the front end side with respect to the flat surface are formed.

  When the cutting tool having such a configuration is mounted on the chuck portion, the cutting tool is inserted into the holding hole so that the retaining protrusion passes through the space between the inner surface and the flat surface of the holding hole. Then, the cutting tool is rotated in a direction opposite to the cutting rotation direction in a state where the rotation prevention protrusion is inserted into the space and the retaining protrusion is inserted into the annular groove. As a result, the function of preventing the cutting tool from coming off and the function of preventing rotation are exhibited.

  For example, Patent Document 2 discloses a configuration in which a tool shaft is inserted into a receiving hole of a tool receiving pin, and the head of the tool receiving pin and the tool shaft are non-rotatably coupled using the pin.

Japanese Patent No. 5571253 Japanese Patent Publication No. 63-41692

  However, in the conventional techniques such as Patent Documents 1 and 2 described above, since the processing tool is mounted on the tool holder by shrink fitting or pins, the mounting work of the processing tool on the tool holder is complicated.

  Further, in Patent Document 1, when the cutting tool is not sufficiently fixed to the chuck portion by shrink fitting, the machining tool rotates in the cutting rotation direction with respect to the chuck portion by the inertia force when the spindle stops rotating. There is. Such rotation of the cutting tool can also occur when the cutting tool comes into contact with a workpiece or the like when the spindle stops rotating. Then, since the flat surface and the retaining projection are positioned in the same phase, the cutting tool may be detached from the chuck portion.

  The present invention has been made in consideration of such problems, and it is possible to easily perform the work of mounting the processing tool on the tool holder, and that the processing tool is detached from the tool holder when the spindle stops rotating. It is an object to provide a tool holder, a processing tool, and a machine tool that can be suppressed.

  In order to achieve the above object, a tool holder according to the present invention includes a shank portion of a machining tool having a blade portion that rotates in a first rotation direction in accordance with rotation of a spindle of a machine tool to machine a workpiece at a tip portion. A detachable tool holder, wherein the shank portion is formed with a notch-shaped portion formed by notching an outer peripheral surface of the shank portion, and the notch-shaped portion includes a first locking surface and a first locking surface. The tool holder is provided on a holder main body in which an insertion hole into which the notch-shaped portion can be inserted is formed and an inner surface of the insertion hole, and the working tool is advanced by an urging member. A tool holding portion that holds the notch-shaped portion in a state of being biased to the side, and the tool holding portion pushes the notch-shaped portion into the insertion hole against a biasing force of the biasing member. The first body is inserted into the holder body. By contacting the first locking surface under the action of the urging force of the urging member while being rotated in the second rotation direction opposite to the rolling direction, the tip end side of the processing tool with respect to the holder body By contacting the second locking surface at a lock position where movement of the processing tool to the tip side of the holder body is restricted by the first restriction portion, and the first restriction portion restricting the movement of the holder body, And a second restricting portion for restricting rotation of the processing tool relative to the holder main body in the first rotation direction.

  According to such a configuration, the notch-shaped portion of the processing tool is inserted into the insertion hole of the holder body against the biasing force of the biasing member and rotated in the second rotation direction. By bringing the first locking surface into contact with the first restricting portion under the action of the force, it is possible to easily perform the work of attaching the processing tool to the tool holder. Further, when the rotation of the spindle is stopped, the rotation of the machining tool with respect to the tool holder in the first rotation direction due to an inertia force or the like is regulated by the second regulating unit at the lock position, so that the machining tool is detached from the tool holder. Can be suppressed.

  In the tool holder, the second restricting unit moves the processing tool in the locked position in a direction opposite to a biasing direction of the biasing member with respect to the holder body, thereby The first restricting portion may be provided so as to be rotatable in the first rotation direction up to an unlock position where the movement to the tip side of the processing tool is not restricted without contacting the stop surface.

  According to such a configuration, the machining tool is removed from the tool holder by rotating the machining tool in the locked position in the first rotation direction while moving the machining tool in the direction opposite to the biasing direction of the biasing member. Can be easily performed.

  In the above tool holder, each of the second locking surface and the second restricting portion may be a flat surface.

  According to such a configuration, the second locking surface and the second restricting portion can be easily brought into surface contact with each other, so that it is ensured that the processing tool at the locked position moves to the unlocked position by inertial force or the like. Can be suppressed.

  In the above tool holder, the notch-shaped portion has a third locking surface, and the tool holding portion comes into contact with the third locking surface at the lock position, whereby the holder main body of the processing tool. There may be provided a third restricting portion for restricting the rotation in the second rotating direction.

  According to such a configuration, the machining tool can be reliably rotated in the first rotation direction in a state where the third locking surface of the machining tool is in contact with the third restricting portion of the tool holding unit.

  In the above tool holder, each of the third locking surface and the third restricting portion may be a flat surface.

  According to such a configuration, the third locking surface and the third restricting portion can be easily brought into surface contact with each other, so that the processing tool can be prevented from rattling against the tool holder during the processing of the workpiece.

  In the above tool holder, the notch-shaped portion has a fourth locking surface, and the tool holding portion comes into contact with the fourth locking surface, whereby the biasing of the processing tool with respect to the holder body is performed. You may have the 4th control part which controls the movement to the direction opposite to the urging | biasing direction of a member.

  According to such a structure, it can suppress that an excessive load acts on a biasing member during the process of a workpiece | work.

  Said tool holder WHEREIN: The said tool holding | maintenance part has a holding | maintenance part main body, and the protrusion part which protruded from the end surface which faces the axial direction of the said holder main body among the said holding | maintenance part main bodies, The said 1st control part is The projecting portion is a front end surface, and the second restricting portion is a side surface of the projecting portion that is continuous with the end surface of the holding unit main body, and the projecting length of the projecting portion is in the axial direction of the processing tool. It may be longer than the length of the second locking surface along.

  According to such a configuration, the second locking surface can be reliably brought into contact with the second restricting portion when the spindle stops rotating with a simple configuration.

  A machining tool according to the present invention is provided on a rear end side of a blade portion that rotates in a first rotation direction in accordance with rotation of a spindle of a machine tool to process a workpiece, and is attachable to and detachable from a tool holder. A shank part, wherein the shank part is formed with a notch-shaped part formed by notching an outer peripheral surface of the shank part, and the tool holder has the notch-shaped part. A holder main body formed with an insertion hole that can be inserted; and a tool holding portion that is provided on an inner surface of the insertion hole and holds the notch-shaped portion in a state in which the working tool is biased toward the distal end side by a biasing member. The tool holding part has a first restricting part and a second restricting part, and the notch-shaped part is configured to resist the urging force of the urging member. The first time with respect to the holder body The tool is moved toward the front end side of the processing tool relative to the holder body by contacting the first restricting portion under the action of the urging force of the urging member in a state of being rotated in the second rotation direction opposite to the direction. By contacting the second restricting portion at a lock position in which movement of the processing tool to the tip side of the holder body is restricted by the first engaging surface, And a second locking surface for restricting rotation of the processing tool relative to the holder body in the first rotation direction.

  According to such a configuration, it is possible to obtain a processing tool having the same effects as the above-described tool holder. The same applies to a machining tool having a configuration described below.

  In the above processing tool, the second locking surface contacts the second restricting portion by moving the processing tool in a direction opposite to the biasing direction of the biasing member with respect to the holder body. Instead, the first restricting portion may be provided so as to be rotatable in the first rotation direction to an unlock position where the movement of the processing tool toward the tip side is not restricted.

  In the above processing tool, each of the second locking surface and the second restricting portion may be a flat surface.

  In the above processing tool, the tool holding portion includes a third restricting portion, and the notch-shaped portion contacts the third restricting portion at the lock position, whereby the processing tool with respect to the holder main body. You may have the 3rd locking surface which controls the rotation of a 2nd rotation direction.

  In the above processing tool, each of the third locking surface and the third restricting portion may be a flat surface.

  In the above processing tool, the tool holding portion has a fourth restricting portion, and the notch-shaped portion comes into contact with the fourth restricting portion, whereby the biasing member of the working tool with respect to the holder main body is You may have the 4th latching surface which controls the movement to the opposite direction to an urging | biasing direction.

  In the above processing tool, the tool holding portion includes a holding portion main body, and a protruding portion protruding from an end surface of the holding portion main body that is oriented in the axial direction of the holder main body, and the first restricting portion is The second restricting portion is a side surface of the protruding portion that is continuous with the end surface of the holding portion main body, and the second locking surface along the axial direction of the processing tool. The length of the protrusion may be shorter than the protrusion length of the protrusion.

  A machine tool according to the present invention is provided on a tool holder, a spindle that rotates the tool holder in a first rotation direction, a blade portion that processes a workpiece, and a rear end side of the blade portion, and is attachable to and detachable from the tool holder. A machine tool including a processing tool including a shank portion and an urging member for urging the processing tool toward the tip end, wherein the tool holder is the tool holder described above.

  According to such a configuration, it is possible to obtain a machine tool having the same effects as the above-described tool holder.

  According to the present invention, the first notch portion of the working tool is inserted into the insertion hole of the holder body and rotated against the urging force of the urging member, and is rotated under the action of the urging force of the urging member. By bringing the locking surface into contact with the first restricting portion, the work tool can be easily attached to the tool holder, and the work tool can be prevented from being detached from the tool holder when the spindle stops rotating. it can.

FIG. 2 is a partially omitted vertical cross-sectional view of a machining part of a machine tool according to an embodiment of the present invention. 2A is an enlarged perspective view of a shank portion of the processing tool of FIG. 1, and FIG. 2B is an enlarged perspective view of a part of the tool holder of FIG. FIG. 3A is an explanatory view showing a state in which the notch-shaped portion of the shank portion is inserted into the insertion hole of the tool holder, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 3A. 4A is an explanatory view showing a state in which the processing tool of FIG. 3A is rotated approximately 90 degrees in the second rotation direction, and FIG. 4B is a cross-sectional view taken along the line IVB-IVB of FIG. 4A. 5A is an explanatory view showing a state in which the processing tool of FIG. 4A has moved to the tip side, and FIG. 5B is a cross-sectional view taken along the line VB-VB of FIG. 5A. FIG. 6A is an explanatory view showing a state in which the processing tool of FIG. 5A is rotated in the first rotation direction by an inertial force or the like, and FIG. 6B is a cross-sectional view taken along the line VIB-VIB of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a tool holder and a processing tool according to the present invention will be described with reference to the accompanying drawings by giving preferred embodiments in relation to a machine tool including these members.

  As shown in FIG. 1, the machine tool 10 includes a multi-axis machining head 12 that can perform machining on a plurality of locations of a workpiece W simultaneously. The multi-axis machining head 12 is also called a gang head and has a plurality of machining portions 14. Since the plurality of processed parts 14 have the same configuration, only one processed part 14 will be described below.

  The processing unit 14 includes a processing tool 16 for processing the workpiece W, a tool holder 18 to which a shank portion 28 of the processing tool 16 can be attached and detached, a spindle 20 to which the tool holder 18 is attached, and a contact member 22 provided on the spindle 20. And an urging member 24. In the following description, the left side of FIG. 1 is referred to as the “front end” side (X1 direction), and the right side of FIG. 1 is referred to as the “rear end” side (X2 direction). Further, the rotation direction of the processing tool 16 capable of machining the workpiece W is referred to as a first rotation direction (R1 direction), and the opposite direction to the first rotation direction is referred to as a second rotation direction (R2 direction).

  The processing tool 16 is configured as a cutting tool for performing a reaming process on the inner surface of the hole 100 formed in the workpiece W, for example. However, it goes without saying that the processing tool 16 may be a tool for performing processing other than the reamer processing on the workpiece W. In addition, each of the plurality of processing units 14 may include different types of processing tools 16.

  The processing tool 16 extends in one direction, and has a blade portion 26 provided on the front end side (one end side) and a columnar shape provided on the rear end side (the other end side) with respect to the blade portion 26. And a shank portion 28. The blade portion 26 extends from the front end to the rear end side of the processing tool 16 by a predetermined length, and cuts the work W by rotating in the first rotation direction in contact with the work W.

  As shown in FIG. 2A, the rear end portion of the shank portion 28 is tapered in a taper shape toward the rear (X2 direction). The shank portion 28 is formed with a notch-shaped portion 30 formed by notching the outer peripheral surface thereof.

  The notch-shaped portion 30 includes a first surface (fourth locking surface) 32 that faces the rear end side of the processing tool 16, and a taper at the rear end portion of the shank portion 28 along the axial direction from the first surface 32. A second surface 34 extending to a portion, a third surface 36 and a fourth surface (second locking surface) 38 adjacent to the second surface 34 in the first rotational direction (R1 direction), and a third surface A sixth surface (first locking surface) that faces the tip surface (X1 direction) of the machining tool 16 and a fifth surface (third locking surface) 40 adjacent to the 36 and the fourth surface 38 in the first rotation direction. Surface) 42 is formed.

  Each of the first surface 32, the second surface 34, the fourth surface 38, the fifth surface 40, and the sixth surface 42 is a flat surface, and the third surface 36 is a curved surface. The first surface 32 is continuous with the second surface 34, the third surface 36, and the fifth surface 40. The second surface 34 is formed such that the front end side continuous with the third surface 36 is narrower than the rear end side continuous with the fourth surface 38. The third surface 36 is located on the tip side (X1 direction) of the processing tool 16 with respect to the fourth surface 38.

  The angle formed by the second surface 34 and the fourth surface 38 is set to approximately 90 degrees. That is, a step is formed between the fourth surface 38 and the third surface 36. In other words, the fourth surface 38 constitutes one surface of the convex portion 44 that protrudes outward in the radial direction of the processing tool 16 from the third surface 36. That is, the fourth surface 38 is located radially outward of the processing tool 16 relative to the third surface 36. The angle formed by the second surface 34 and the fourth surface 38 can be arbitrarily set.

  The length L1 along the axial direction of the fourth surface 38 is shorter than the length L2 along the axial direction of the third surface 36. Each of the fourth surface 38 and the fifth surface 40 is directed outward in the radial direction of the processing tool 16 and is continuous with the sixth surface 42. That is, the fourth surface 38 and the fifth surface 40 are located on the same plane.

  As shown in FIG. 2B, the tool holder 18 includes a cylindrical holder main body 48 in which an insertion hole 46 into which the shank part 28 can be inserted is formed, and a tool holding part 50 provided integrally on the inner surface of the insertion hole 46. And have. A flange portion 52 is provided on one end side (X1 direction) of the holder main body 48. The flange portion 52 is formed with an insertion hole 53 through which a bolt 51 for fixing the holder body 48 to the spindle 20 is inserted.

  The tool holding portion 50 includes a holding portion main body 54 having a cross section of a shape (substantially D-shaped) obtained by cutting a perfect circle along a string shorter than a diameter, and the other end of the holder main body 48 from the holding portion main body 54. And a projecting portion 56 projecting to the side (X2 direction). The holder main body 54 extends from one end of the holder main body 48 to the other end side slightly from the center.

  The first end surface (fourth restricting portion) 58 in the X1 direction of the holding portion main body 54 can contact the first surface 32 of the notch shape portion 30 in a state where the notch shape portion 30 is inserted into the insertion hole 46. The first end surface 58 of the holding portion main body 54 is a plane that restricts the movement of the processing tool 16 in the X2 direction with respect to the holder main body 48 by contacting the first surface 32. The inner surface (third restricting portion) 60 facing the inner peripheral surface of the insertion hole 46 in the holding portion main body 54 is a state in which the notch-shaped portion 30 is inserted into the insertion hole 46 and rotated approximately 90 degrees in the R2 direction. It is possible to contact the fifth surface 40 of the notch-shaped part 30. The inner side surface 60 of the holding portion main body 54 is a plane that regulates the rotation of the processing tool 16 relative to the holder main body 48 in the second rotation direction (R2 direction) by contacting the fifth surface 40. The second end surface 62 in the X2 direction of the holding member main body is formed flat.

  The protruding portion 56 protrudes in the X2 direction from the second end surface 62 of the holding portion main body 54. The protrusion 56 is formed in a sector shape having a central angle of 90 degrees or more and less than 180 degrees in plan view. The protruding length L3 of the protruding portion 56 is formed to be longer than the length L1 along the axial direction of the fourth surface 38 of the notch-shaped portion 30. The front end surface (first restricting portion) 64 of the protruding portion 56 is oriented in the X2 direction, can contact the sixth surface 42 of the notch-shaped portion 30, and restricts the movement of the processing tool 16 in the X1 direction. It is a plane to do. The tip end face 64 of the protrusion 56 is located in the first rotation direction (R1 direction) of the second end face 62 in plan view from the X2 direction.

  A first side surface (second restricting portion) 66 that is continuous with the second end surface 62 of the holding portion main body 54 in the protruding portion 56 can contact the fourth surface 38 of the notch-shaped portion 30, and It is a plane which regulates rotation in one rotation direction (R1 direction). The second side surface 68 of the protruding portion 56 is connected to the inner side surface 60 of the holding portion main body 54 to form one plane.

  As shown in FIG. 1, the spindle 20 is a rotating shaft that rotates in the first rotation direction under the action of a drive source (not shown). The surface of the spindle 20 oriented in the X1 direction is formed with a recess 70 into which the tool holder 18 is inserted, and a shaft hole 72 formed on the bottom surface of the recess 70 in which the contact member 22 and the biasing member 24 are disposed. Has been. The shaft hole 72 is located on the rotation axis of the spindle 20.

  The contact member 22 contacts the rear end portion of the shank portion 28 in a state where the shank portion 28 of the processing tool 16 is mounted on the tool holder 18. A portion of the contact member 22 that contacts the shank portion 28 is a tapered concave surface corresponding to the outer surface shape of the rear end portion of the shank portion 28.

  The biasing member 24 biases the processing tool 16 in the X1 direction via the contact member 22, and is interposed between the contact member 22 and the bottom surface of the shaft hole 72. In the present embodiment, the urging member 24 is configured as a compression coil spring. However, the urging member 24 may be a spring member other than the compression coil spring, a rubber member (elastic member), or the like.

  The machine tool 10 according to the present embodiment is basically configured as described above. Next, operations of the processing tool 16 and the tool holder 18 will be described. In FIG. 3A to FIG. 6B, the holder main body 48 is displayed with a virtual line and the tool holding unit 50 is displayed with a solid line thicker than the machining tool 16 for easy understanding. In the initial state, it is assumed that the tool holder 18 is attached to the spindle 20 as shown in FIG.

  First, when the shank portion 28 of the machining tool 16 is mounted on the tool holder 18, the axis of the machining tool 16 is rotated so that the second surface 34 of the notch-shaped portion 30 and the inner surface 60 of the tool holding portion 50 face each other. Then, the shank portion 28 is inserted into the insertion hole 46 of the tool holder 18 from the X1 direction. Then, the rear end portion of the shank portion 28 that has passed through the insertion hole 46 comes into contact with the contact member 22.

  Then, the pressing force P1 (see FIG. 3A) in the X2 direction against the urging force P2 in the X1 direction of the urging member 24 (see FIG. 5A) is applied to the machining tool 16 (the urging force P2 of the urging member 24 is resisted). Then, the processing tool 16 is further pushed in the X2 direction). Then, the movement of the machining tool 16 in the X2 direction is stopped by the first surface 32 of the notch-shaped portion 30 coming into contact with the first end surface 58 of the tool holding portion 50 (see FIGS. 3A and 3B). At this time, the convex portion 44 of the notch-shaped portion 30 is located in the X2 direction with respect to the protruding portion 56 of the tool holding portion 50.

  Subsequently, the processing tool 16 in a state where the notch-shaped portion 30 is inserted into the insertion hole 46 (a state where the pressing force P1 is applied) is rotated in the second rotation direction (R2 direction). Then, when the fifth surface 40 of the notch-shaped portion 30 contacts the inner surface 60 of the tool holding portion 50, the rotation of the machining tool 16 with respect to the tool holder 18 in the second rotation direction is stopped (FIGS. 4A and 4B). reference). That is, the processing tool 16 shown in FIG. 3A rotates approximately 90 degrees in the second rotation direction.

  As a result, the sixth surface 42 of the notch-shaped portion 30 faces the tip surface 64 of the protruding portion 56 of the tool holding portion 50. In other words, the machining tool 16 is locked at a position (FIG. 4A and FIG. 4A) where the movement in the X1 direction is regulated by the tip surface 64 from the unlock position (the position in FIGS. 3A and 3B) where the movement in the X1 direction is not regulated by the tip surface 64. 4B).

  Next, when the pressing force P1 acting on the machining tool 16 is released (the hand is released from the machining tool 16), the machining tool 16 is moved in the X1 direction under the action of the biasing force P2 (see FIG. 5A) of the biasing member 24. Move to. Then, the sixth surface 42 of the notch-shaped portion 30 comes into contact with the tip surface 64 of the protruding portion 56 of the tool holding portion 50, so that the movement of the machining tool 16 in the X1 direction is stopped (see FIGS. 5A and 5B). . Thereby, the mounting work of the processing tool 16 to the tool holder 18 is completed.

  When processing the workpiece W (reamer processing) with the processing tool 16, the spindle 20 is rotated in the first rotation direction (R1 direction) under the action of a drive source (not shown). Then, since the tool holder 18 fixed to the spindle 20 rotates in the first rotation direction, the machining tool 16 is in a state where the inner surface 60 of the tool holding portion 50 and the fifth surface 40 of the notch-shaped portion 30 are in contact with each other. It rotates in the first rotation direction.

  Subsequently, the processing unit 14 is brought close to the workpiece W and the blade portion 26 is brought into contact with the workpiece W. Then, the machining tool 16 receives a reaction force in the X2 direction from the workpiece W and moves in the X2 direction with respect to the tool holder 18 while resisting the biasing force P2 of the biasing member 24. Then, when the first surface 32 of the notch-shaped portion 30 contacts the first end surface 58 of the tool holding portion 50, the movement of the machining tool 16 in the X2 direction is stopped (see FIGS. 4A and 4B). Thereby, it can suppress that an excessive load acts on the urging | biasing member 24 during the process of the workpiece | work W. FIG.

  When the machining of the workpiece W is completed and the blade portion 26 is separated from the workpiece W, the machining tool 16 moves in the X1 direction by the urging force P2 of the urging member 24. Then, the sixth surface 42 of the notch-shaped portion 30 comes into contact with the tip surface 64 of the protruding portion 56 of the tool holding portion 50, so that the movement of the machining tool 16 in the X1 direction is stopped (see FIGS. 5A and 5B). . At this time, the convex portion 44 (the fourth surface 38) is located in the X2 direction with respect to the second end surface 62.

  Thereafter, when the rotation of the spindle 20 is stopped, the rotation of the tool holder 18 is also stopped, and the machining tool 16 rotates in the first rotation direction (R1 direction) with respect to the tool holder 18 by inertial force. Then, when the fourth surface 38 of the notch-shaped portion 30 contacts the first side surface 66 of the protruding portion 56 of the tool holding portion 50, the rotation of the machining tool 16 in the first rotation direction is stopped (FIG. 6A and FIG. 6). 6B). That is, the processing tool 16 is maintained at the locked position and does not rotate to the unlocked position. Thereby, it is suppressed that the processing tool 16 is detached (dropped off) from the tool holder 18.

  When removing the processing tool 16 from the tool holder 18, the first surface 32 of the notch-shaped portion 30 is caused to act on the first end surface 58 of the tool holding portion 50 by applying a pressing force P <b> 1 to the processing tool 16 in the locked position. The processing tool 16 is moved in the X2 direction to a position in contact with (see FIGS. 4A and 4B). At this time, the convex portion 44 of the notch-shaped portion 30 is located in the X2 direction with respect to the protruding portion 56 of the tool holder 18.

  In this state, the processing tool 16 is rotated with respect to the tool holder 18 in the first rotation direction. Then, the second surface 34 of the notch-shaped portion 30 comes into contact with the inner surface 60 of the tool holding portion 50, so that the rotation of the machining tool 16 in the first rotation direction is stopped. Thereby, the processing tool 16 which was in the lock position moves to the unlock position. Thereafter, the work tool 16 is removed from the tool holder 18 in the X1 direction, whereby the work for removing the work tool 16 from the tool holder 18 is completed.

  According to this embodiment, the notch-shaped portion 30 of the processing tool 16 is inserted in the insertion hole 46 of the holder body 48 against the biasing force of the biasing member 24 and rotated in the second rotation direction. By bringing the sixth surface 42 of the processing tool 16 into contact with the tip surface 64 of the tool holding portion 50 under the action of the urging force of the urging member 24, the mounting operation of the processing tool 16 on the tool holder 18 can be easily performed. .

  Further, when the rotation of the spindle 20 is stopped, the rotation of the machining tool 16 with respect to the tool holder 18 by the inertia force in the first rotation direction is restricted by the first side surface 66 of the tool holding unit 50 at the lock position. Can be prevented from being detached from the tool holder 18. Note that the machining tool 16 may also rotate in the first rotation direction relative to the tool holder 18 when the machining tool 16 hits the workpiece W or the like when the spindle 20 stops rotating. Can be prevented from being detached from the tool holder 18.

  Further, the work tool 16 can be easily detached from the tool holder 18 by rotating the work tool 16 in the locked position in the first rotation direction while being moved in the X2 direction.

  Furthermore, since each of the fourth surface 38 of the notch-shaped portion 30 and the first side surface 66 of the tool holding unit 50 is a flat surface, the fourth surface 38 and the first side surface 66 can be easily brought into surface contact. Can do. Therefore, it can suppress reliably that the processing tool 16 in a locked position moves to an unlocked position by inertia force etc. FIG.

  In the present embodiment, each of the fifth surface 40 of the notch-shaped portion 30 and the inner side surface 60 of the tool holding unit 50 is a flat surface, so that the fifth surface 40 and the inner side surface 60 are easily brought into surface contact. Can do. Thereby, it is possible to prevent the machining tool 16 from rattling against the tool holder 18 during machining of the workpiece W.

  According to the present embodiment, the protrusion length L3 of the protrusion 56 of the tool holder 50 is longer than the length L1 of the fourth surface 38 along the axial direction of the machining tool 16, and therefore the spindle 20 can be rotated with a simple configuration. The fourth surface 38 can be reliably brought into contact with the first side surface 66 of the protruding portion 56 at the time of stopping.

  The present embodiment is not limited to the configuration described above. The third surface 36 of the notch-shaped portion 30 may be a flat surface instead of a curved surface. Moreover, each of the 4th surface 38 and the 5th surface 40 of the notch shape part 30 may be a curved surface instead of a plane. Further, each of the first end surface 58, the second end surface 62, and the first side surface 66 of the tool holding unit 50 may be a curved surface instead of a flat surface.

  Of course, the tool holder, the processing tool, and the machine tool according to the present invention are not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Machine tool 16 ... Processing tool 18 ... Tool holder 20 ... Spindle 24 ... Energizing member 26 ... Blade part 28 ... Shank part 30 ... Notch shape part 32 ... 1st surface (4th latching surface) 34 ... 2nd Surface 36 ... Third surface 38 ... Fourth surface (second locking surface)
40: Fifth surface (third locking surface) 42 ... Sixth surface (first locking surface)
46 ... Insertion hole 48 ... Holder main body 50 ... Tool holding part 54 ... Holding part main body 56 ... Protruding part 58 ... First end face (fourth regulating part)
60 ... Inner side surface (third regulating portion) 62 ... Second end surface 64 ... Front end surface (first regulating portion) 66 ... First side surface (second regulating portion)
68 ... Second side W ... Workpiece

Claims (15)

A tool holder capable of detaching a shank portion of a processing tool having a blade portion at a tip portion that rotates in a first rotation direction in accordance with rotation of a spindle of a machine tool and processes a workpiece,
The shank part is formed with a notch-shaped part formed by cutting out the outer peripheral surface of the shank part,
The notch-shaped portion has a first locking surface and a second locking surface,
The tool holder is
A holder body in which an insertion hole into which the cutout shape part can be inserted is formed;
A tool holding portion that is provided on the inner surface of the insertion hole and holds the notch-shaped portion in a state in which the working tool is biased toward the distal end side by a biasing member;
The tool holder is
The notch-shaped portion is inserted into the insertion hole against the urging force of the urging member and rotated in a second rotation direction opposite to the first rotation direction with respect to the holder body. A first restricting portion for restricting movement of the processing tool toward the distal end side with respect to the holder body by contacting the first locking surface under the action of a biasing force of a biasing member;
The first tool with respect to the holder main body of the processing tool is brought into contact with the second locking surface at a lock position where movement of the processing tool toward the tip side of the holder main body is restricted by the first restricting portion. A tool holder comprising: a second restricting portion that restricts rotation in the rotation direction. The tool holder according to claim 1, wherein
The second restricting portion contacts the second locking surface by moving the processing tool at the lock position in a direction opposite to a biasing direction of the biasing member with respect to the holder body. The tool holder is provided so as to be rotatable in the first rotation direction to an unlock position where movement of the machining tool toward the tip side by the first restricting portion is not restricted. The tool holder according to claim 1 or 2,
Each of the said 2nd latching surface and the said 2nd control part is a flat surface, The tool holder characterized by the above-mentioned. In the tool holder according to any one of claims 1 to 3,
The notch-shaped portion has a third locking surface;
The tool holding part has a third restricting part that restricts the rotation of the processing tool relative to the holder body in the second rotation direction by contacting the third locking surface at the lock position. Tool holder characterized by The tool holder according to claim 4,
Each of the said 3rd latching surface and the said 3rd control part is a flat surface, The tool holder characterized by the above-mentioned. In the tool holder according to claim 4 or 5,
The notch-shaped portion has a fourth locking surface;
The tool holding portion has a fourth restricting portion that restricts movement of the working tool with respect to the holder body in a direction opposite to the urging direction of the working tool by contacting the fourth locking surface. A tool holder characterized by that. In the tool holder according to any one of claims 1 to 6,
The tool holder is
A holding body,
A projecting portion projecting from an end face oriented in the axial direction of the holder body of the holding body,
The first restricting portion is a front end surface of the protruding portion;
The second restricting portion is a side surface that is continuous with the end surface of the holding portion main body among the protruding portions,
The protrusion length of the protrusion is longer than the length of the second locking surface along the axial direction of the processing tool. A processing tool comprising: a blade portion that rotates in a first rotation direction with a rotation of a spindle of a machine tool to process a workpiece; and a shank portion that is provided on the rear end side of the blade portion and is attachable to and detachable from a tool holder. Because
The shank part is formed with a notch-shaped part formed by cutting out the outer peripheral surface of the shank part,
The tool holder is
A holder body in which an insertion hole into which the cutout shape part can be inserted is formed;
A tool holding portion that is provided on the inner surface of the insertion hole and holds the notch-shaped portion in a state in which the working tool is biased toward the distal end side by a biasing member;
The tool holding part has a first restriction part and a second restriction part,
The notch-shaped part is
The notch-shaped portion is inserted into the insertion hole against the urging force of the urging member and rotated in a second rotation direction opposite to the first rotation direction with respect to the holder body. A first locking surface for restricting movement of the processing tool to the tip side with respect to the holder body by contacting the first restricting portion under the action of a biasing force of a biasing member;
The first engagement surface of the processing tool with respect to the holder body is brought into contact with the second restricting portion at a lock position where movement of the processing tool toward the distal end side of the holder body is restricted by the first locking surface. And a second locking surface for restricting rotation in the rotation direction. The processing tool according to claim 8, wherein
The second locking surface moves the processing tool in a direction opposite to the biasing direction of the biasing member with respect to the holder body, thereby preventing the first restriction without contacting the second restriction part. A machining tool, wherein the machining tool is provided so as to be rotatable in the first rotation direction to an unlock position where movement of the machining tool toward the tip side by the portion is not restricted. In the processing tool according to claim 8 or 9,
Each of the said 2nd latching surface and the said 2nd control part is a flat surface, The processing tool characterized by the above-mentioned. In the processing tool according to any one of claims 8 to 10,
The tool holding part has a third restricting part,
The notch-shaped portion has a third locking surface that restricts the rotation of the processing tool relative to the holder body in the second rotation direction by contacting the third restriction portion at the lock position. A processing tool characterized by that. The processing tool according to claim 11, wherein
Each of the said 3rd latching surface and the said 3rd control part is a flat surface, The processing tool characterized by the above-mentioned. In the processing tool according to claim 11 or 12,
The tool holding part has a fourth restriction part,
The notch-shaped part has a fourth locking surface that regulates movement of the working tool in the direction opposite to the urging direction of the urging member with respect to the holder body by contacting the fourth restricting part. A processing tool characterized by having. In the processing tool according to any one of claims 8 to 13,
The tool holder is
A holding body,
A projecting portion projecting from an end face oriented in the axial direction of the holder body of the holding body,
The first restricting portion is a front end surface of the protruding portion;
The second restricting portion is a side surface that is continuous with the end surface of the holding portion main body among the protruding portions,
The length of the said 2nd locking surface along the axial direction of the said processing tool is a processing tool characterized by the protrusion length of the said protrusion part being shorter. A tool holder;
A spindle for rotating the tool holder in a first rotation direction;
A machining tool comprising a blade portion for machining a workpiece and a shank portion provided on the rear end side of the blade portion and attachable to and detachable from the tool holder;
A biasing member that biases the processing tool toward the tip side, and a machine tool comprising:
The machine tool according to any one of claims 1 to 7, wherein the tool holder is the tool holder according to any one of claims 1 to 7.

Images