JP2009154220A - Cutware - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutware capable of largely reducing time and labor in replacement, in which a tool body can be rigidly attached to a machine tool and easily and quickly replaced. <P>SOLUTION: A circumferential groove 23 and a notched groove 28 extending in the direction orthogonal to an axis line O are provided on a protrusion 22 of the tool body 12. An attachment hole 45 is formed on an adapter 13 fixed to a main shaft 100 of the machine tool. A pair of wedge insertion holes 47 passing through an inner peripheral wall surface of the hole 45 outward in the radial direction of the tool are provided to be opposited in the circumference direction. Wedge members 51 and 52 are inserted into the respective wedge insertion holes 47, and a pin 53 is provided to straddle them. One of the wedge members 51 is fixed to the pin 53, and in addition the other wedge member 52 is bolted with the pin 53 so that it can be fastened/loosened in the radial direction of the tool. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention cuts an inner wall surface of a prepared hole provided in advance in a workpiece to form a processed hole, and performs cutting for cutting the periphery of the opening of the processed hole coaxially with the processed hole. It relates to tools.

  Conventionally, as a cutting tool for finishing a valve hole in a cylinder head of an engine and processing an opening of the valve hole into a predetermined shape, a hole drilling tool inserted into a prepared hole provided in advance in a workpiece And the thing provided with the cutting blade which cuts the opening part of this pilot hole coaxially is proposed (for example, refer patent document 1 or patent document 2).

  This type of cutting tool has a tool body that rotates about an axis, and a rear end side portion of the tool body is formed with a mounting portion that is attached to a tool holding portion of a machine tool. A mounting hole extending along the axis is formed in the surface. A reamer having a cutting edge at the tip is inserted into the mounting hole as a long and substantially cylindrical hole processing tool. The mounting hole communicates with a clamp screw hole drilled from the outer peripheral surface of the tool body, and the reamer inserted into the mounting hole is pressed by a clamp screw screwed into the clamp screw hole. It is firmly fixed. Further, a cutting insert is attached to the outer periphery of the tip of the tool body.

This cutting tool has a mounting portion formed on the rear end side of the tool body attached to the tool holding portion of the machine tool, and the tool body is sent toward the front end side in the axial direction while rotating around the axis. The reamer mounted in the mounting hole of the engine, for example, processes a pilot hole made of a valve hole in a cylinder head of an engine into a predetermined inner diameter, and the cutting hole of the cutting insert mounted on the outer peripheral portion of the tool body causes the valve hole. The valve seat surface with which the valve head comes into contact with the opening is machined. By processing in this way, the valve hole and the valve seat surface are formed coaxially.
Japanese Patent No. 2748846 JP-A-6-304804

  By the way, in the above-mentioned conventional cutting tool, when performing processing on valve holes of different specifications and their openings, it is necessary to perform replacement work to a hole processing tool having a corresponding cutting blade and a tool body, In addition, it is necessary to replace the drilling tool and the tool body with new ones depending on the life or chipping of the cutting blade. At this time, although the hole drilling tool can be attached and detached relatively easily, the tool main body having a cutting edge on the outer periphery of the tip is attached to the tool holding portion in order to secure the mounting rigidity to the tool holding portion of the machine tool. Since it is firmly fixed, there has been a problem that it takes a lot of time and labor to attach and detach the tool body.

  The present invention has been made in view of such a problem, and allows the tool body to be firmly attached to the machine tool, and can be easily and quickly replaced, thereby greatly reducing time and labor in the replacement work. It aims at providing the cutting tool which can do.

In order to solve the above problems, the present invention proposes the following means.
That is, the cutting tool according to the present invention has a tool body that rotates about an axis, and is equipped with a drilling tool that extends to the tip side of the tool body along the axis, and an outer periphery of the tip of the tool body. A cutting edge is arranged in the part, and an inner wall surface of a prepared hole previously formed in the work material is cut by the hole machining tool to form a machining hole, and the opening of the machining hole is cut by the cutting edge. A cutting tool to be processed, wherein the tool body is attached to a machine tool via an adapter, and a protrusion centered on the axis line at one of a rear end portion of the tool body and a tip end portion of the adapter And the other is provided with a mounting hole for fitting with the protrusion, and the protrusion has a circumferential groove on the outer periphery thereof, and the direction along the direction perpendicular to the axis is From the front end of the protrusion A notch groove portion formed by being cut out toward the side is provided, and a wedge insertion hole formed so as to penetrate the inner peripheral wall surface outward in the tool radial direction is provided in the mounting hole. A pair of wedge members are formed so as to face each other, and a wedge member that engages with the circumferential groove and fixes the tool body and the adapter in the axial direction is inserted into each of the wedge insertion holes. A pin that can be fitted into the notch groove is provided so as to span the two wedge members, and one of the wedge members is fixedly integrated with the pin, and the other of the wedge members is connected to the pin. The wedge member is bolted so as to be separable in the tool radial direction, and the wedge member is provided with a pressing surface that gradually approaches the bottom of the mounting hole toward the outer side in the tool radial direction, and the circumferential groove has the pressing surface. It is characterized in that the pressing surface is provided which is pressed vertically by the pressing surface inclined in terms equal angles.

The cutting tool having such a feature is configured such that the tool body is attached to the machine tool via an adapter. When the tool body is mounted on the adapter, first, either the tool body or the tool adapter is firstly attached. The mounting hole and the projection are fitted to each other so that the pin located in the mounting hole is fitted into the notch groove formed in the other projection, that is, the pin is sandwiched by the notch groove. Next, by tightening the bolt of the other wedge member among the wedge members located at both ends of the pin, the other wedge member moves inward in the tool radial direction, and is connected to the pin via the pin. One of the fixed wedge members also moves inward in the tool radial direction.
Thereby, each of the two wedge members engages with the circumferential groove of the protrusion, and the tool body and the adapter are fixed and integrated in the axial direction.
At this time, the pressing surface of the wedge member presses the pressed surface of the circumferential groove and the protrusion is pushed into the mounting hole, so that the tool body and the adapter can be firmly fixed and integrated in the axial direction. It becomes.

  When removing the tool body from the adapter in such a state, by loosening the bolt of the other wedge member, each of the two wedge members can be moved outward in the tool radial direction. The engagement with the circumferential groove is released, and the axial fixation between the tool body and the adapter is released. From the above, the tool main body can be firmly attached to the adapter only by the operation of tightening and loosening the bolt of one wedge member, and can be easily and quickly replaced.

  Moreover, the cutting tool according to the present invention is provided in the tool body and the adapter so that a mounting hole for inserting the drilling tool passes through the axis, and the pin is connected to the axis. A long hole is provided which extends along the longitudinal direction of the pin.

  For example, when a collet chuck or the like for holding a drilling tool is on the machine tool side, the drilling tool needs to reach the machine tool and be held by the collet chuck in a state of passing through the tool body and the adapter. However, in the cutting tool of the present invention, since the tool body and the adapter are provided with through holes and the pins are provided with long holes, the hole drilling tool is mounted so as to pass through these holes. The rear end side of the tool is held by the machine tool. Further, when removing the tool body from the adapter with the hole drilling tool mounted in this manner, the other wedge member is moved outward in the tool radial direction by loosening the bolt of the other wedge member. . At this time, the pin can move within the length of the longitudinal direction of the opening of the long hole with the hole machining tool inserted through the long hole. The wedge member can also move outward in the tool radial direction. Therefore, even when the drilling tool is mounted through the tool body and the adapter, the wedge member can move in the tool radial direction without being obstructed by this, so that the tool body can be easily and quickly moved. The tool body can be removed by releasing the axial fixation with the adapter.

  Furthermore, the cutting tool according to the present invention has a tapered side surface in which the protruding portion is reduced in diameter toward the distal end side of the protruding portion with the axis as the center, and the mounting hole is fitted to the tapered side surface. It has a taper inner peripheral wall surface.

  By fitting the tapered side surface of the protrusion and the tapered inner wall surface of the attachment hole when the protrusion is inserted into the attachment hole, the central axes of the protrusion and the attachment hole are made to coincide. Accordingly, since the tool body can be centered with high accuracy with respect to the adapter, it is possible to maintain high processing accuracy.

  Further, the cutting tool according to the present invention is characterized in that a stopper is provided to limit the movement of the wedge member to the outside in the tool radial direction within a certain range. As a result, it is possible to prevent inadvertent wedge members and pins from inadvertently falling out of the cutting tool, and to ensure safety.

  According to the cutting tool of the present invention, the tool body having a cutting edge on the outer periphery of the tip can be firmly attached to the machine tool and can be easily and quickly replaced. And labor can be greatly reduced.

  Hereinafter, embodiments of a cutting tool of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of a cutting tool according to the present invention.

  The cutting tool 11 is positioned on the tool rear end side (right side in FIG. 1) of the multi-stage columnar tool body 12 rotated in the tool rotation direction T around the axis O at the time of processing, and the rear end portion , An adapter 13 connected to the main spindle of the machine tool, a long reamer 14 as a drilling tool extending along the axis O toward the tool tip side (left side in FIG. 1) of the tool body 12, and a tool And a cutting insert 36 disposed with the cutting edge 37 facing the outer periphery of the tool tip side of the main body 12. The reamer 14 has a substantially columnar shape, and a cutting edge portion 14a is formed at a tip side portion thereof, and a rear end side portion thereof is a shank portion 14b.

  The tool main body 12 has a multi-stage columnar shape that extends along the axis O and has an outer diameter that increases from the tool front end side toward the rear end side. On the tool rear end side of the portion 21, a protrusion 22 having a diameter smaller than that of the body portion 21 is formed so as to extend along the axis O toward the tool rear end side and about the axis O. Yes.

  As shown in FIG. 2 which is a side view of the tool rear end side portion of the tool body 12 in detail, the outer peripheral side surface is recessed toward the inner side in the one-step tool radial direction at the center portion of the projection portion 22 in the axis O direction. A circumferential groove 23 is formed, the outer peripheral side surface of the projection 22 is divided into two in the direction of the axis O by the circumferential groove 23, and the outer peripheral side surface on the tool rear end side is a flat side surface 24 parallel to the axis O. The outer peripheral side surface on the front end side is a tapered side surface 25 that gradually decreases in diameter about the axis O toward the tool rear end side. Further, the boundary between the circumferential groove 23 and the flat side surface 24 and the tapered side surface 25 is formed so as to be inclined, and in particular, the boundary portion between the circumferential groove 23 and the flat side surface 24 is on the outer side in the tool radial direction. The pressed surface 26 is a convex conical surface formed so as to gradually approach the rear end side of the tool as it goes.

  Further, the protrusion end face 27 that is the end face facing the tool rear end side of the protrusion 22 and the surface facing the rear end side of the tool body around the protrusion 22 are flat surfaces perpendicular to the axis O. As shown in FIG. 3 which is a plan view of the tool rear end side portion of the tool body 12, the protrusion end face 27 is cut out toward the tool front end side along the direction orthogonal to the axis O. A notch groove 28 is formed. The groove width of the notch groove portion 28 is formed to be substantially the same as the diameter of the pin 53 described later, and the groove bottom 28a has an arc shape so that the pin 53 described later can be fitted into the notch groove portion 28. It is said that.

  As shown in FIG. 1, the tool body 12 is provided with a mounting hole 29 through which the reamer 14 is inserted so as to penetrate along the axis O from the tool front end side to the rear end side. The tool tip side portion of the mounting hole 29 is a small-diameter hole 29a whose one-stage diameter is reduced. The small diameter hole 29a has a cylindrical shape, and a bush 31 into which the shank portion 14b of the reamer 14 is inserted is fitted into the small diameter hole 29a.

  An adjustment screw hole 32 that is orthogonal to the axis O and extends along the radial direction and communicates from the outer peripheral surface of the tool main body 12 to the small-diameter portion 29a of the mounting hole 29 at the substantially central portion of the tool main body 12 in the axis O direction. Is formed. The adjusting screw hole 32 is screwed with an adjusting screw 33 having a substantially cylindrical shape whose tip end surface is a pressing end surface 33a that presses the shank portion 14b of the reamer 14 as an adjusting means for adjusting the swing of the reamer 14. ing.

  Further, a notch 35 is formed in the outer peripheral portion on the tip end side of the tool body 12 so as to open toward the outer side in the tool radial direction and toward the tool tip side. A cutting insert 36 having a cutting edge 37 is detachably mounted by a mounting screw 38. In the present embodiment, three cutting inserts 36 are arranged at intervals of 120 ° in the circumferential direction, and the angles formed by the cutting edges 37 and the axis O of the three cutting inserts 36 are different from each other. Yes. Further, a pressing screw 39 for adjusting the position of the cutting insert 36 in the axis O direction is provided on the tool rear end side of the cutting insert 36.

  As shown in FIG. 1, the adapter 13 is inserted into the front end portion of the substantially cylindrical outer peripheral sleeve 101 of the main spindle 100 of the machine tool that is coaxially arranged on the rear end side, and the engagement hole 20 shown in FIG. These are connected by being fastened by bolts (not shown) so that the rotation of the outer peripheral sleeve 101 is transmitted to the adapter 13.

  As shown in detail in FIGS. 4 and 5, the adapter 13 has an approximately two-stage cylindrical shape extending along the axis O and having a tool tip side reduced in diameter by one step compared to the rear end side. The front end side is a mounting portion 41, and the tool rear end side is a large diameter portion 42. Further, on the tool rear end side of the large-diameter portion 42, a fitting portion 42a that is a protrusion centering on the axis O having a smaller diameter than the large-diameter portion 42 is formed. It is set as the structure fitted in the fitting hole 101a formed in the front-end | tip part.

  The end surface of the mounting portion 41 of the adapter 13 facing the tool front end is an adapter front end surface 44, which is a flat surface perpendicular to the axis O. The center of the adapter front end surface 44 has a cross section with the axis O as the center. A mounting hole 45, which is a bottomed hole recessed in a circular shape, is opened, and further passes through the bottom 45a of the mounting hole 45 so as to extend from the bottom 45a along the axis O to the tool rear end side. A mounting hole 46 through which the reamer 14 is inserted is provided.

  Further, as shown in FIGS. 4 to 6, the inner peripheral wall surface and the outer peripheral side surface of the mounting hole 45 are communicated in the tool radial direction at the central portion of the inner peripheral wall surface of the mounting hole 45 in the axis O direction. A pair of wedge insertion holes 47 having a quadrangular shape are formed so as to face each other in the tool radial direction with the axis O of the attachment hole 45 interposed therebetween. Further, the inner peripheral wall surface of the mounting hole 45 is divided into two in the direction of the axis O by the wedge insertion hole 47, and the inner peripheral wall surface on the tool tip side gradually increases in diameter around the axis O toward the tool tip side. A tapered inner peripheral wall surface 48 having the same taper angle as the tapered side surface 25 is formed, and an inner peripheral wall surface on the tool rear end side is a flat inner wall surface 49 parallel to the axis O.

  Then, as described above, the wedge members 51 and 52 are respectively inserted into the wedge insert holes 47 formed so as to be opposed to each other in the tool radial direction of the mounting portion 41, and these two wedge members 51 are also inserted. , 52 spans the diameter direction of the mounting hole 45, and the pin 53 is disposed.

  Of the two wedge members 51 and 52, one wedge member 51 located on the upper side in FIGS. 4 to 6 is a plate having a certain thickness in the direction of the axis O, as shown in detail in FIGS. The surface 55 facing inward in the radial direction has a shape formed in an arc shape along a circle centering on the axis O. The wedge member 51 is formed with a bolt insertion hole 57 extending so as to communicate the surface 55 facing the radially inner side and the surface 56 facing the radially outer side in the tool radial direction. A counterbore hole 58 that is one step larger in diameter than the bolt insertion hole 57 is provided in the outer portion in the tool radial direction.

  Further, the surface 59 facing the tool front end of the wedge member 51 is a storage recess 60 in which a portion located on the outer side in the tool radial direction is recessed one step on the tool rear end side, and the surface 59 facing the tool front end and the storage recess A step portion between the portion 60 and the portion 60 is a contact step portion 61. Further, at the boundary portion between the surface 62 facing the tool rear end side of the wedge member 51 and the surface 55 facing the radial inner side, the wedge member 51 is formed so as to gradually approach the tool rear end side toward the outer side in the tool radial direction, A pressing surface 63 having an inclination angle similar to that of the pressed surface 26 is formed.

  The wedge member 51 having such a configuration is fixed and integrated so that the surface 55 facing the inner side in the radial direction is in contact with one end portion 65 of the pin 53. As shown in detail in FIGS. 7 and 8, the pin 53 has a cylindrical shape extending in the tool diameter direction. A bolt fixing hole 66 is opened at one end 65 of the pin 53, and a pin 67 is formed at the other end 67. A bolt insertion hole 68 is opened. The pin 53 is provided with a long hole 69 that penetrates along the axis O and whose opening extends from the axis O toward the other end 67 of the pin 53 with a substantially elliptical diameter. The fixing bolt 70 is screwed into the bolt insertion hole 57 of the wedge member 51 and the bolt fixing hole 66 of the pin 53 so that the one end portion 65 of the pin 53 comes into contact with a desired surface on the radially inner side of the wedge member 51. In rare cases, the wedge member 51 and the pin 53 are fixedly integrated.

  Further, of the two wedge members 51 and 52, the other wedge member 52 located on the lower side in FIGS. 4 to 6 has an axis similar to the wedge member 51, as shown in detail in FIGS. The plate 72 has a certain thickness in the O direction, and the surface 72 facing the inside in the radial direction has a shape formed in an arc shape along a circle centering on the axis O. Further, the wedge member 52 is formed with a bolt insertion hole 74 extending so as to communicate the surface 72 facing the radially inner side and the surface 73 facing the radially outer side in the tool radial direction.

  Further, the surface 75 of the wedge member 52 facing the tool front end side is formed as a storage groove 76 with a portion closer to the outer side in the tool radial direction recessed toward the rear end side of the tool, and a surface 75 facing the storage groove 76 and the tool front end side. The two step portions between them are the contact step portions 77. Further, the boundary portion between the surface 78 facing the tool rear end side of the wedge member 52 and the surface 72 facing the inner side in the tool radial direction is formed so as to gradually approach the tool rear end side toward the outer side in the tool radial direction. A concave conical pressing surface 79 having an inclination angle similar to that of the pressed surface 26 is formed.

  As shown in FIGS. 1 and 4 to 6, such a wedge member 52 is formed so that the surface 72 facing the inner side in the tool radial direction of the wedge member 52 and the other end 67 of the pin 53 face each other. The bolts 80 are screwed into the bolt insertion holes 74 and the bolt insertion holes 68 of the pins 53. The wedge member 52 can be separated from the pin 53 by tightening or loosening the tightening bolt 80.

  As shown in detail in FIG. 4 or FIG. 5, the adapter tip surface 44 of the adapter 13 and the inner wall surface 47a on the tool tip side of each wedge insertion hole 47 are communicated in the direction of the axis O. Two communication holes 81 are formed, and pin-like stoppers 82 are inserted into the communication holes 81. These stoppers 82 project from the inner wall surface 47 a on the tool front end side of each wedge insertion hole 47 toward the tool rear end side, and are stored in the storage recess 60 of the wedge member 51 and the storage groove of the wedge member 52. .

  In the main shaft 100 of the machine tool positioned on the rear end side of the adapter 13 having the above-described configuration, as shown in FIG. 1, a substantially cylindrical inner peripheral sleeve 102 is provided on the inner peripheral side of the substantially cylindrical outer peripheral sleeve 101. Are arranged coaxially. The inner peripheral hole formed in the inner peripheral sleeve 102 includes a first hole 105 that opens toward the distal end surface, a second hole 106 that has a smaller diameter than the first hole 105, and the second hole 106. Further, the third hole 107 having a one-step smaller diameter is continuously provided. In the first hole 105, a tool rear end side portion of the nut member 103 having gear teeth 103a formed on the outer peripheral surface thereof is fitted.

    A collet chuck 108 for supporting the reamer 14 is inserted into the second hole 106. The collet chuck 108 includes a pair of chuck members 109 and 110 that are arranged in a line in the direction of the axis O, and a collet 111 that is arranged on the radially inner side of the chuck members 109 and 110.

      The chuck members 109 and 110 are formed in a substantially cylindrical shape having an outer diameter that can be inserted into the second hole 106, and the chuck member 109 arranged on the tool front end side faces the tool rear end side of the nut member 103. The chuck member 110 that is brought into contact with the surface and disposed on the rear end side of the tool is brought into contact with the bottom surface of the second hole 106 facing the front end side of the tool, and the axis line is between the pair of chuck members 109 and 110. They are arranged at intervals in the O direction. Further, taper portions 109a and 110a that gradually increase in diameter toward the other chuck member 109 and 110 are formed on the inner peripheral sides of these chuck members 109 and 110, respectively.

  The collet 111 has a substantially cylindrical shape whose outer peripheral side is in close contact with the tapered portions 109a and 110a, and a plurality of slits along a plane including the central axis of the collet 111 are formed in the cylindrical wall portion. (Not shown) is formed, and the inner diameter of the collet 111 is reduced by bending the portion sandwiched between the slits radially inward with respect to the central axis. The shank portion 14 b of the reamer 14 is inserted on the inner peripheral side of the collet 111.

  Further, the adapter 13 is provided with a moving member (not shown) that moves the nut member 103 arranged on the tool front end side of the chuck 108 so as to be movable back and forth in the direction of the axis O. The moving member has a disc shape and worm teeth formed on the outer periphery thereof. The worm teeth are engaged with the gear teeth 103a of the nut member 103, and the nut member 103 is rotated by rotating the moving member. It is configured to be movable in the direction of the axis O. This moving member is configured to be rotated by a work tool such as a hexagon stick wrench.

  Next, a procedure for attaching the tool main body 12 to the adapter 13 coaxially fixed to the spindle 100 of the machine tool in the cutting tool 11 having the above-described configuration will be described. First, in the state in which the tightening bolt 80 of the wedge member 52 is loosened and the distance between the pair of wedge members 51 and 52 is larger than the outer diameter of the projection 22, the projection 22 of the tool body 12 is attached to the mounting hole 45 of the adapter 13. Insert into. At this time, the pin 53 arranged so as to span the mounting hole 45 of the adapter 13 in the tool diameter direction is fitted into the notch groove portion 28 of the protrusion 22 of the tool body 12, that is, the notch groove portion. The projections 22 of the tool main body 12 are pushed into the mounting holes 45 of the adapter 13 so that the pin 53 is sandwiched by 28.

  At this time, the taper side surface 25 of the projection 22 of the tool body 12 and the taper inner peripheral wall surface 48 of the mounting hole 45 of the adapter 13 are tapered with the same taper angle. Since it has a circular shape at the center, in the state where the protrusion 22 is attached to the attachment hole 45, the taper side surface 25 and the outer peripheral taper portion 34 are fitted to each other, so that the center axis of the tool body 12 is the adapter. 13 center axes.

  In this way, when the tightening bolt 80 of the wedge member 52 is tightened in a state where the projection 22 of the tool body 12 is fitted in the mounting hole 45 of the adapter 13, the wedge members 51 and 52 come close to each other. Then, it moves toward the inside in the tool radial direction.

  When the two wedge members 51 and 52 are moved inward in the tool radial direction by tightening the loosening bolt 80 in this manner, the wedge members 51 and 52 are flat inner wall surfaces of the mounting holes 45 as shown in FIG. 49 so that the wedge members 51 and 52 come into contact with the circumferential groove 23 formed in the protrusion 22 of the tool body 12 as shown in FIGS. 1 and 6. By engaging, the movement of the tool body 12 in the direction of the axis O relative to the adapter 13 is prevented. Thereby, the tool body 12 and the adapter 13 are fixedly integrated.

  When the two wedge members 51 and 52 move inward in the tool radial direction as described above, the pressing surfaces 63 and 79 of the respective wedge members 51 and 52 press the pressed surface 26 of the projection 22, so that the tool The main body 12 is pressed toward the adapter 13, and the tool main body 12 and the adapter 13 are firmly attached in the direction of the axis O.

  Next, a procedure for mounting the reamer 14 in a state where the tool body 12 is attached to the adapter 13 will be described. First, the shank portion 14b side of the reamer 14 is inserted into the bush 31 from the tip side of the tool body 12, and the mounting hole 29 of the tool body 12, the long hole 69 of the pin 53, and the mounting hole 46 of the adapter 13 are inserted, The main axis 100 of the machine tool located on the rear end side of the adapter 13 is reached. At this time, with the inner diameter of the collet 111 enlarged, the shank portion 14b of the reamer 14 is inserted into the nut member 103 and the collet 111, and a moving member (not shown) is used using a work tool such as a hexagon wrench. And the nut member 103 is moved to the tool rear end side. Then, the surface of the nut member 103 facing the rear end side of the tool presses the chuck members 109 and 110, and the collet 111 is deformed so that the inner diameter thereof is reduced, thereby supporting the shank portion 14b of the reamer 14. Become. The adjustment screw 33 adjusts the swing of the reamer 14 to complete the mounting operation of the reamer 14.

  The mounting operation of the tool body 12 and the reamer 14 is completed as described above, the tool body 12 is rotated in the tool rotation direction T around the axis O, and the feed toward the front end side in the axis O direction is given, whereby the cutting edge of the reamer 14 is obtained. The portion 14a, for example, processes a pilot hole made of a valve hole in a cylinder head of an engine to a predetermined inner diameter, and a cutting blade 37 of a cutting insert 36 processes a valve seat surface in which the valve head abuts the opening of the valve hole. To do.

  And when removing these in order to replace | exchange reamer 14 and the tool main body 12, removal work is performed in the reverse procedure to the time of attachment. That is, a moving member (not shown) is rotated with a work tool such as a hexagonal bar wrench to release the support of the shank portion 14b of the reamer 14 by the collet chuck 108, and the reamer 14 is extracted from the front end side of the tool body. As the tightening bolt 80 of the 52 is loosened, the wedge members 51, 52 move outward in the tool radial direction, and the wedge members 51, 52 engage with the circumferential groove 23 of the projection 22 of the tool body 12. As shown in FIG. 5, the wedge members 51 and 52 are flush with the flat inner wall surface 49 of the mounting hole 45, and the tool body 12 can be removed from the adapter 13. When the wedge members 51 and 52 are moved to the outside in the tool radial direction to some extent in this way, the stopper 82 comes into contact with each of the contact step portions 61 and 77 of the wedge members 51 and 52, and the wedge members 51 and 52 Since movement to the outer side in the radial direction is prevented, the wedge members 51 and 52 and the pin 53 do not accidentally fall out of the adapter 13.

  In addition to the procedure for removing the tool body 12 after removing the reamer 14 as described above, in the cutting tool 11 of this embodiment, it is also possible to perform the replacement work only for the tool body 12 with the reamer 14 attached. It is. That is, when the shank portion 14b of the reamer 14 is supported by the collet chuck 108 of the spindle 100 of the machine tool, if the loosening bolt 80 of the wedge member 52 is loosened, the wedge member 52 moves outward in the tool radial direction. At the same time, the pin 53 moves outside in the tool radial direction within the range of the length of the opening of the long hole 69 without being obstructed by the presence of the reamer 14 with the reamer 14 inserted through the long hole 69. Therefore, the wedge member 51 fixed to the pin 53 can also easily move outward in the tool radial direction as the pin 53 moves. Thereby, the engagement between the wedge members 51 and 52 and the circumferential groove 23 of the projection 22 of the tool body 12 is released, and the wedge members 51 and 52 are flat inner wall surfaces of the mounting holes 45 as shown in FIG. Thus, the tool body 12 can be separated from the adapter 13 and moved in the direction of the axis O. Therefore, in this state, by removing the tool body 12 by shifting it toward the tool tip side of the reamer 14, it is possible to perform the replacement work of only the tool body 12 while the reamer 14 is mounted.

  From the above, in the cutting tool 11 according to the present embodiment, the two wedge members 51, 52 can be moved inward or outward in the tool radial direction by the operation of tightening the tightening bolt 80, and the wedge members 51, 52 and the circumferential groove 23 of the projection 22 of the tool body 12 can be engaged and disengaged, so that the tool body 12 can be firmly fixed to the adapter 13 and the tool body 12 can be easily and quickly fixed. Exchange work can be performed.

  Moreover, even when the reamer 14 penetrates the tool body 12 and the adapter 13 and is supported by the spindle 100 of the machine tool by forming the long hole 69 in the pin 53 as described above, Without being hindered by the presence of the reamer 14, the tool body 12 and the adapter 13 can be easily and quickly released from fixing in the direction of the axis O, and only the tool body 12 can be removed.

  Further, when the protrusion 22 of the tool body 12 is fitted into the mounting hole 45 of the adapter 13, the center axis of the tool body 12 and the adapter 13 coincide with each other by fitting the tapered side surface 25 and the outer peripheral tapered portion 34 to each other. Therefore, centering can be performed with high accuracy, and processing accuracy can be kept high. Furthermore, by providing the stopper 82 that prevents the wedge members 51 and 52 from moving outward in the tool radial direction, the wedge members 51 and 52 and the pin 53 are not accidentally dropped from the adapter 13. Safety can be ensured.

  Note that the shapes, combinations, operation procedures, and the like of the constituent members shown in the above-described embodiments are merely examples, and various changes can be made based on design requirements and the like without departing from the spirit of the present invention.

It is a sectional side view showing one embodiment of a cutting tool concerning the present invention. It is a side view of the tool rear end side part of a tool main body. It is a top view of the tool rear end side part of a tool main body. It is a sectional side view of an adapter, a wedge member, and a pin when a wedge member moves to radial inside. It is side sectional drawing of an adapter, a wedge member, and a pin when a wedge member moves to radial direction outer side. It is AA sectional drawing in FIG. It is a sectional side view of one wedge member and a pin. It is a front view of one wedge member and a pin. It is a sectional side view of the other wedge member. It is a front view of the other wedge member.

Explanation of symbols

11 Cutting Tool 12 Tool Body 13 Adapter 14 Reamer (Drilling Tool)
22 Protruding portion 23 Circumferential groove 25 Tapered side surface 26 Pressed surface 28 Notch groove portion 29 Mounting hole 37 Cutting blade 45 Mounting hole 46 Mounting hole 47 Wedge insertion hole 48 Tapered inner peripheral wall surface 51 Wedge member 52 Wedge member 53 Pin 63 Pressing surface 69 Long hole 79 Press surface 80 Loosening bolt 82 Stopper 100 Main spindle of machine tool

Claims (4)

A tool body that rotates about an axis, a hole machining tool that extends toward the tip of the tool body along the axis is mounted, and a cutting blade is disposed on the outer periphery of the tip of the tool body; A cutting tool for cutting an inner wall surface of a prepared hole provided in advance in a work material by a machining tool to form a machining hole, and for cutting an opening of the machining hole by the cutting blade,
The tool body is attached to a machine tool via an adapter,
A projection centered on the axis is provided on either the rear end of the tool body or the tip of the adapter, and the other is provided with a mounting hole for fitting with the projection.
The protrusion has a circumferential groove on its outer periphery, and is formed by cutting out the protrusion from the front end side to the rear end side in a direction perpendicular to the axis. Is provided,
A pair of wedge insertion holes formed so as to penetrate the inner peripheral wall surface toward the outside in the tool radial direction are formed in the mounting holes so as to face each other with the axis line in between.
A wedge member that engages with the circumferential groove and fixes the tool body and the adapter in the axial direction is inserted into each of the wedge insertion holes,
A pin that can be fitted into the notch groove is provided so as to span the two wedge members,
One of the wedge members is fixedly integrated with the pin, and the other of the wedge members is bolted so as to be separable from the pin in the tool radial direction,
The wedge member is provided with a pressing surface that gradually approaches the bottom of the mounting hole as it goes outward in the tool radial direction,
A cutting tool, wherein the circumferential groove is provided with a pressed surface that is inclined at an angle equal to the pressing surface and pressed perpendicularly by the pressing surface. The tool body and the adapter are provided so that a mounting hole for inserting the drilling tool passes through the axis,
2. The cutting tool according to claim 1, wherein the pin is provided with a long hole penetrating along the axis and having an opening extending in a longitudinal direction of the pin. The protrusion has a tapered side surface that decreases in diameter toward the tip side of the protrusion around the axis.
The cutting tool according to claim 1, wherein the attachment hole has a tapered inner peripheral wall surface that fits with the tapered side surface.   The cutting tool according to any one of claims 1 to 3, further comprising a stopper that restricts movement of the wedge member to the outside in a tool radial direction within a certain range.

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