JP2008006568A - Insert attaching/detaching type spherical surface cutter and insert for spherical surface cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert attaching/detaching type spherical surface cutter capable of accurately and easily adjusting the positions of circular-arc shaped cutting blades by surely pressing inserts by pressing members in adjusting directions. <P>SOLUTION: This insert attaching/detaching type spherical surface cutter 10 is provided with the pressing members 26 for adjusting the positions of the circular-arc shaped cutting blades 33 in mounting seats 22. Each of the inserts is formed into a polygonal flat plate shape in its external shape, and has two polygonal faces and side faces intersecting the polygonal faces. The one polygonal face is made a rake face. In the one polygonal face, circular-arc ridge line parts projected and curved toward an outer peripheral side of the polygonal face are formed. In the circular-arc ridge line parts, the circular-arc shape cutting blades 33 are provided. A side face 32a connected to the circular-arc ridge line parts is made a flank. In a side face 32b arranged on a side opposed to the flank, cut-out parts 34 into which distal ends of the pressing members 26 can be inserted are formed. Bottom face parts 34a of the cut-out parts 34 are made faces to be pressed by the pressing members 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an insert detachable spherical cutter and an insert for a spherical cutter used when a spherical counterbore portion is formed on a workpiece.

  Conventionally, as a spherical cutter that forms a spherical counterbore on the inner surface of a cavity formed in a workpiece, both end surfaces in the axial direction of a substantially cylindrical tool body extending along the axis are formed into convex curved surfaces. A plurality of recesses are arranged on both end surfaces at intervals in the circumferential direction, and a cutting edge tip having an arcuate cutting edge is provided on the wall surface facing the front side in the tool rotation direction of these recesses. What is brazed in the state which protruded from the end surface is widely provided.

Here, these cutting blades are polished for each end face in a state where the cutting edge chips are brazed, so that each end face has a center on the axis of the tool body and is slightly radiused than the end face. It is formed so as to be located on a large spherical surface.
Further, the tool body is formed with mounting holes extending along the axis so as to open on both end faces, and the axially inner portion of the mounting hole has a square cross section centered on the axis. Is formed.

  Such a spherical cutter is accommodated in a cavity formed in the workpiece, and a pair of machine tools from the outside through a pair of insertion holes formed coaxially in the workpiece so as to communicate with the cavity. Each arbor is inserted, and the tips of these arbors are rotated around the axis through the arbor by attaching them to the mounting holes from both sides in the axial direction. Then, by rotating the tool main body and feeding the arbor so as to reciprocate integrally with the tool main body on both sides in the axial direction, the insertion holes are formed around the insertion holes on the inner surface of the cavity portion. A concave spherical counterbore centered on the axis is formed by the cutting edge of the cutting edge tip brazed to the end face of the tool body facing sideways. Here, by adjusting the feed amount by the arbor, by matching the center of the concave spherical surface formed by the counterbore portion formed on the inner surface of the hollow portion, the counterbore portion that is concavely curved along one spherical surface is formed. It is formed at both ends of the inner surface.

  However, in the spherical cutter of this configuration, the cutting edge tip is brazed to the tool body, so that when the cutting edge is worn, the cutting edge is re-polished like a normal brazing tool. . If the cutting edge is repolished while keeping the diameter of the arc formed by the cutting edge constant, the center of the arc will be displaced in the axial direction. The feed amount needs to be changed. Therefore, there is a possibility that the spherical counterbore cannot be formed with high accuracy due to a feed amount setting error, a measurement error of the cutting edge position, or the like. In addition, since the tool body and the cutting blade are integrally formed by brazing, when the material of the cutting blade is to be changed depending on the material to be cut, the spherical cutter itself must be replaced. Therefore, it is necessary to prepare many spherical cutters according to the above, and there is a problem that the use cost of the spherical cutter increases.

Therefore, as shown in Patent Document 1, for example, there is provided an insert detachable spherical cutter in which a mounting seat is formed on an end surface of a tool body, and an insert having a cutting blade is detachably mounted on the mounting seat.
This insert detachable spherical cutter has a tool body that rotates about its axis, and a plurality of recesses are formed on both end surfaces in the axial direction of the tool body, and a mounting seat is provided on the rear side of these recesses in the tool rotation direction. It has been.

An accommodation hole extending in a direction perpendicular to the wall surface is formed in the axially inner portion of the wall surface facing the front side in the tool rotation direction of the mounting seat, and the position of the insert cutting blade is adjusted in this accommodation hole. As the position adjusting mechanism, a pressing pin having a pressing surface at the tip and an adjusting screw for pressing the pressing pin are accommodated.
In addition, a clamp screw hole into which a clamp screw for fixing the insert is screwed is formed on the wall surface facing the front side in the tool rotation direction of the mounting seat so as to extend in parallel with the accommodation hole.

  The conventional insert mounted on the mounting seat is made of a hard material such as cemented carbide, has a substantially rectangular flat plate shape, and has two rectangular surfaces and four side surfaces intersecting the rectangular surfaces. . One rectangular surface is a rake face that faces the front side in the tool rotation direction, and one side of the rectangular surface that is the rake face protrudes outward in an arc shape, and an arc-shaped cutting edge is provided. . Further, a side surface connected to the cutting edge is a flank, and a pressed surface is formed on a side surface opposite to the flank. In addition, an insertion hole through which the clamp screw is inserted is formed in the square surface.

The insert is placed on the mounting seat such that one rectangular surface that is a rake face faces the front side in the tool rotation direction, and the pressed surface faces the inner side in the axial direction. It arrange | positions so that it may face an axial direction outer side from the end surface of a tool main body. In this state, the clamp screw inserted into the insertion hole is screwed into the clamp screw hole, and the insert is attached to the mounting seat.
Here, the pressing surface of the pressing pin accommodated in the accommodation hole is in contact with the pressed surface, and the pressing surface presses the pressed surface by screwing the adjusting screw, so that the insert is axially outside. The position of the arcuate cutting blade can be adjusted by moving to.

With this spherical cutter, even if the cutting blade is worn, the insert can be replaced and used, so that the center of the arc formed by the cutting blade can be made constant, and there is no need to adjust the feed amount for each spherical cutter. Furthermore, when it is desired to change the material of the cutting blade depending on the material to be cut, it can be dealt with by simply replacing the insert, and it is not necessary to prepare many tool bodies, and the cost of using the spherical cutter can be greatly reduced. Moreover, since the position of the cutting blade can be adjusted by pressing the insert, the cutting blade is positioned on a spherical surface having a center on the axis of the tool body even when the cutting blade is worn and the insert is replaced. Can be arranged as follows.
JP 2000-343316 A

By the way, in the above-mentioned spherical cutter insert, since the pressed surface is formed in a uniform flat shape, when the insert is pressed, the tip portion of the pressing pin moves along the pressed surface, and the insert May be pressed in a direction other than the adjustment direction, and the position of the arcuate cutting blade may not be accurately adjusted.
In addition, when the insert is pressed toward the outside in the radial direction, the insert is separated from the wall surface of the mounting seat facing the outside of the tool body in the radial direction, and the insert may be displaced due to cutting resistance during cutting. there were.

  The present invention has been made in view of the above-described circumstances, and it is possible to accurately and easily adjust the position of the arcuate cutting blade by reliably pressing the insert in the adjustment direction by the pressing member. It is an object to provide a detachable spherical cutter and an insert for a spherical cutter.

  In order to solve this problem, an insert detachable spherical cutter according to the present invention is provided with a spherical cutter insert having an arcuate cutting edge, and a spherical portion provided in a work piece by the arcuate cutting edge. An insert detachable spherical cutter that forms a counterbore part, and has a tool body that rotates about an axis, and the tool body has a mounting seat on an end surface facing the axial direction, A pressing member that adjusts the position of the arcuate cutting blade by pressing the spherical cutter insert mounted on the mounting seat in the adjusting direction is provided, and the spherical cutter insert has a polygonal flat plate shape. And having two polygonal surfaces and side surfaces intersecting these polygonal surfaces, one polygonal surface being a scooping surface, the one polygonal surface being an outer peripheral side of the polygonal surface Convex toward An arcuate ridge part is formed, and an arcuate cutting edge is provided on the arcuate ridgeline part, and a side surface connected to the arcuate ridgeline part is a flank face, and a side face disposed on the side facing the flank face Is characterized in that a notch portion into which the tip of the pressing member can be inserted is formed, and a bottom surface portion of the notch portion is a pressed surface pressed against the pressing member.

  An insert for a spherical cutter according to the present invention is an insert for a spherical cutter to be mounted on the above-described insert detachable spherical cutter, the outer shape of the insert is a polygonal flat plate, two polygonal surfaces and these polygons A polygonal surface is formed as a rake face, and the one polygonal surface is formed with an arcuate ridge line portion convex toward the outer peripheral side of the polygonal surface, An arcuate cutting edge is provided at the arc ridge line portion, and a side surface connected to the arc ridge line portion is a flank face, and a side surface disposed on the side facing the flank face is a tip of the pressing member. Is formed, and a bottom surface of the notch is a pressed surface that is pressed by the pressing member.

  According to the insert detachable spherical cutter and the insert for the spherical cutter having this configuration, the notch portion into which the tip of the pressing member can be inserted is formed on the side surface of the spherical cutter insert. The spherical cutter insert can be surely pressed toward the adjustment direction without moving in the direction, and the position of the arcuate cutting blade can be adjusted accurately and easily.

  Here, a wall surface is formed on the mounting seat so that the other side surface that faces the radially outer side of the tool body and intersects with the side surface that is the flank surface of the insert for spherical cutter contacts the insert for the spherical cutter. The spherical cutter insert is attached to the tool of the mounting seat by the pressing member so as to be pressed toward the wall surface parallel to the wall surface or toward the outer side in the axial direction through the pressed surface. It can move along the wall surface facing the outside in the main body radial direction.

  In addition, when the angle α formed by the straight line orthogonal to the pressed surface and the axis is set in a range of 0 ° ≦ α ≦ 5 ° in the state of being mounted on the mounting seat, a spherical surface is formed by the pressing member. When pressing the cutter insert and adjusting the position in the axial direction, it is possible to reliably prevent the spherical cutter insert from being separated from the wall surface of the mounting seat facing the outside in the tool body radial direction.

  Furthermore, the polygonal surface is formed with an insertion hole through which a clamp screw having a shaft portion and a contact surface orthogonal to the shaft portion is inserted, and a clamp surface with which the contact surface is contacted is formed. , By inclining the clamp surface so as to gradually retreat as approaching the cutting edge with respect to a plane orthogonal to the axis of the insertion hole, the contact surface of the clamp screw and the clamp surface do not adhere closely, A slight gap is formed on the cutting edge side, and when the spherical cutter insert is pressed, the clamp screw is easily deformed so that only the gap is bent. The position of the cutting blade can be adjusted smoothly.

  According to the present invention, an insert detachable spherical cutter and an insert for a spherical cutter capable of accurately and easily adjusting the position of the arcuate cutting blade by reliably pressing the insert in the adjustment direction by the pressing member. Can be provided.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 5 show an insert detachable spherical cutter, and FIGS. 6 and 7 show a spherical cutter insert according to an embodiment of the present invention.
As shown in FIGS. 2 and 3, the insert detachable spherical cutter 10 includes a tool body 11 having a substantially cylindrical shape extending along the axis O, and the tool body 11 is located at the center of the axis O direction. Thus, it is formed so as to be symmetrical with respect to a virtual plane Q extending in a direction orthogonal to the axis O.

At the center of the tool body 11 in the direction of the axis O, a groove 12 that is recessed one step radially inward is formed over the entire circumference of the tool body 11, and a pair of grooves extending in parallel with the axis O is formed in the groove 12. The flat surfaces 13, 13 are arranged in parallel to each other.
Both end portions 14 and 14 of the tool body 11 sandwiching the recessed groove 12 are formed in a convex curved surface having end surfaces 15 having centers P (P ′) on the axis O, respectively. A pair of flat portions 16, 16 parallel to the flat surfaces 13, 13 are also formed on the outer peripheral surface 14.
The center P of the spherical surface formed by the end surface 15 facing one side (right side in FIG. 2) is located on the other side of the virtual plane Q, and the spherical surface formed by the end surface 15 facing the other side (left side in FIG. 2). The center P ′ is located on one side of the virtual plane Q, and the length of the tool body 11 in the axis O direction is set smaller than the diameter of the spherical surface formed by the end face 15.

  The both end portions 14 and 14 are formed with attachment holes 17 extending along the axis O so as to open toward the respective end surfaces 15. The mounting hole 17 is formed with a tapered hole portion 18 that gradually decreases in diameter about the axis O as it goes inward in the direction of the axis O in the opening portion on the end face 15 side, and has a square cross section inside the direction of the axis O. A rectangular hole portion 19 is formed. Further, the opening edge of the mounting hole 17 in the end surface 15, that is, the intersection ridge line portion between the end surface 15 having a spherical shape and the tapered hole portion 18 of the mounting hole 17 is annularly formed by chamfering perpendicularly to the axis O. A flat portion 20 is formed.

In addition, a pair of recesses 21 and 21 that open toward the end surface 15 are formed at both ends 14 and 14 so as to be 180 ° rotationally symmetric about the axis O.
A mounting seat 22 for mounting a later-described spherical cutter insert 30 is formed on the wall surface of the recess 21 facing the front side in the tool rotation direction T. The mounting seat 22 is recessed by one step from the wall surface facing the front side in the tool rotation direction T of the recess 21 toward the rear side in the tool rotation direction T, and is opened toward the outer side in the radial direction of the tool body 11 and the outer side in the axis O direction. .

As shown in FIG. 2, the wall surface 22 a facing the outer side of the mounting seat 22 in the direction of the axis O is inclined so as to gradually recede toward the inner side of the tool body 11 in the radial direction. The wall surface 22b of the mounting seat 22 facing the tool body 11 in the radial direction outside is disposed so as to extend in parallel with the axis O.
Furthermore, a clamp screw hole 27 extending in a direction orthogonal to the wall surface 22c is formed in the wall surface 22c facing the tool rotation direction T front side of the mounting seat 22.

  Then, on the inner side in the axis O direction of the mounting seat 22, as shown in FIGS. 2 and 3, two accommodation holes 23 extending in a direction intersecting the wall surface 22 c facing the tool rotation direction T front side of the mounting seat 22. , 23 are formed in parallel. One of these two receiving holes 23, 23 is disposed in the vicinity of the wall surface 22 b facing the tool body 11 radially outward of the mounting seat 22, and the other is disposed in the tool body 11 radially outer portion of the mounting seat 22, The clamp screw hole 27 is configured to be positioned between the two receiving holes 23 in the radial direction of the tool body 11.

Here, in this embodiment, as shown in FIG. 3, the receiving holes 23, 23 are gradually moved forward in the tool rotation direction T in the direction toward the inner side of the axis O as seen from the side facing the axis O. It extends so as to face and is formed so as to open at a portion facing the front side in the tool rotation direction T of the end portion 14 located on the inner side in the axis O direction of the mounting seat 22.
Furthermore, these accommodation holes 23, 23 are directed outward in the direction of the axis O as shown in FIGS. 1 and 2 when viewed from the side facing the wall surface 22c facing the front side in the tool rotation direction T of the mounting seat 22. Accordingly, it is formed to gradually approach the axis O.

  As shown in FIG. 4, a pressing pin 24 is disposed in the accommodation hole 23 on the mounting seat 22 side, and an adjustment screw 25 is screwed on the rear end side of the pressing pin 24. An inclined plane that is inclined with respect to the axis of the pressing pin 24 is formed at the tip of the pressing pin 24, and this inclined plane is a pressing surface 24 a that comes into contact with a spherical cutter insert 30 described later. In other words, the pressing pin 24 can be moved in a direction gradually approaching the axis O as it goes outward in the axis O direction. In the present embodiment, the pressing pin 24 and the adjusting screw 25 serve as a pressing member 26 that adjusts the position of the arcuate cutting blade 33 provided in the insert detachable spherical cutter 10.

  Next, the spherical cutter insert 30 that is detachably mounted on the mounting seat 22 will be described. The spherical cutter insert 30 is made of a hard material such as cemented carbide and has an outer shape of a substantially rectangular flat plate. In this embodiment, as shown in FIG. And has two parallelogram surfaces 31 and four side surfaces 32. One parallelogram surface 31 is directed to the front side in the tool rotation direction T as a rake surface 31a, and the other parallelogram surfaces 31 are provided. Is a mounting surface 31b disposed to face the wall surface 22c facing the front side of the mounting seat 22 in the tool rotation direction T.

  One parallelogram surface 31 which is a rake face 31a has two short sides and two long sides, and one long side is a convex arc shape convex toward the outer peripheral side of the parallelogram. The arcuate cutting edge 33 is provided on this one long side portion. The side surface 32 connected to the arcuate cutting edge 33 is a flank 32a. The side surface 32 forms a convex curved surface that is convex toward the outer peripheral side, and on the inner peripheral side of the parallelogram surface 31 as it approaches the mounting surface 31b. It is inclined to move backward.

  The front end portions of the two pressing pins 24 provided on the mounting seat 22 can be inserted into the side surface 32b connected to the other long side, that is, the side surface 32b facing the side opposite to the side surface defined as the relief surface 32a. A pair of notches 34, 34 are formed. As shown in FIGS. 1 and 6, these notches 34, 34 have a bottom surface portion 34 a and a side wall portion 34 b that are orthogonal to each other when viewed from the side facing one parallelogram surface 31, which is a rake surface 31 a. The side wall part 34b is arranged so as to extend in parallel to a straight line orthogonal to the bottom surface part 34a.

  The bottom surface portion 34a of the cutout portion 34 is a pressed surface that comes into contact with the pressing surface 24a of the pressing pin 24. In this embodiment, the spherical cutter insert 30 is mounted on the mounting seat 22. 1, the crossing angle α at which the straight line perpendicular to the bottom surface 34a (the pressed surface) of the notch 34 intersects the axis O is set within the range of 0 ° ≦ α ≦ 5 °. More specifically, α = 3 °. That is, the straight line orthogonal to the bottom surface portion 34a (the pressed surface) of the notch 34 is obliquely intersected with the axis O so as to gradually approach the axis O as it goes outward in the axis O direction.

  In addition, an insertion hole 35 extending in the thickness direction of the spherical cutter insert 30 and extending along the central axis L is formed in the central portion of the parallelogram surface 31. In the vicinity of one parallelogram surface 31 (rake face 31a) side opening portion of the insertion hole 35, as shown in FIG. 6, a clamp surface 36 having a substantially square shape is formed. The surface 36 is inclined so as to gradually recede from the rake surface 31a as it approaches the arcuate cutting edge 33. In the present embodiment, the clamp surface 36 is formed to intersect with a plane orthogonal to the central axis L of the insertion hole 35 at an intersection angle θ, and the intersection angle θ is 0 ° 10 ′ ≦ θ. ≦ 15 ° is set, and more specifically, θ = 3 ° is set.

  As shown in FIG. 5, a clamp screw 40 for mounting the spherical cutter insert 30 to the mounting seat 22 has a substantially cylindrical shaft portion 41 extending along the central axis M, and is coaxial with the shaft portion 41. The head portion 42 is provided, and a male screw is formed on the outer peripheral surface of the shaft portion 41. The surface of the head portion 42 on the side of the shaft portion 41 is formed in a planar shape extending in a direction orthogonal to the central axis M of the shaft portion 41, and a contact surface 42 a that contacts the spherical cutter insert 30. It is said that.

The spherical cutter insert 30 is mounted on the mounting seat 22 of the tool body 11 as follows to constitute the insert detachable spherical cutter 10.
The spherical cutter insert 30 is mounted such that the mounting surface 31b contacts the wall surface 22c of the mounting seat 22 facing the front side in the tool rotation direction T. Here, the side surface 32b facing away from the flank 32a is disposed opposite to the wall surface 22b facing the outer side in the axis O direction of the mounting seat 22, and the arcuate cutting edge 33 is disposed to face the outer side in the axis O direction. The

The tip of the pressing pin 24 accommodated in the accommodation hole 23 is inserted into the notch 34 formed in the side surface 32 b facing the flank 32 a of the spherical cutter insert 30. The surface 24a is in contact with the bottom surface portion 34a (the pressed surface) of the notch 34.
With the spherical cutter insert 30 placed on the mounting seat 22 in this way, the clamp screw 40 is inserted into the insertion hole 35 and is drilled in the wall surface 22c facing the tool rotation direction T front side of the mounting seat 22. Screw into the clamp screw hole 27. Then, the contact surface 42 a of the clamp screw 40 presses the clamp surface 36 of the spherical cutter insert 30 toward the mounting seat 22, and the spherical cutter insert 30 is fixed to the mounting seat 22.

  Here, the spherical cutter insert 30 mounted on the two mounting seats 22, 22 formed on the end surface 15 facing the same side is a virtual plane S in which the rake face 31 a of the mutual spherical cutter insert 30 passes through the axis O. The end face 15 has a rotation locus centered on the axis O of the arcuate cutting edge 33 formed on the spherical cutter insert 30 and centered on the center P (P ′). It is arranged so as to form one spherical surface R (R ′) having a larger step radius.

  In the insert detachable spherical cutter 10 having such a configuration, when the adjusting screw 25 is screwed, the pressing pin 24 moves toward the mounting seat 22, and the pressing surface 24 a is the pressed surface of the spherical cutter insert 30. The spherical cutter insert 30 is moved outward in the direction of the axis O by pressing the (bottom surface portion 34 a of the notch 34), and the position of the arcuate cutting edge 33 is adjusted.

  In this insert detachable spherical cutter 10, the positions of the arcuate cutting blades 33 are adjusted as described above, and the arcuate shapes of the two spherical cutter inserts 30, 30 mounted on the mounting seat 22 on the same end face 15 side. The positions of the cutting blades 33 and 33 are adjusted so as to coincide with each other in the rotation trajectory centered on the axis O, that is, on the spherical surface R (R ′) centered on the center P (P ′). In this state, it is subjected to the cutting process shown in FIG.

  The insert detachable spherical cutter 10 is accommodated in a cavity C formed in the workpiece W, and a machine tool is inserted into a pair of insertion holes H, H formed coaxially in the workpiece W so as to be inserted into the cavity C. A pair of arbors A and A (not shown) are respectively inserted, and the tips of these arbors A and A are supported by attaching them to the mounting holes 17 from the outside in the axis O direction. Here, the front end of the arbor A is formed with a drive section D having a square cross section that fits into the square hole 19 of the mounting hole 17, and is equal to the tapered hole 18 on the rear end side. A taper portion E that is reduced in diameter toward the tip side at a taper angle is formed, and the axis O of the tool body 11 is changed to a rotation axis by the arbors A and A by closely contacting the taper portion E and the taper hole portion 18. At the same time, the tool body 11 is rotated together with the arbors A and A in the tool rotation direction T by fitting the square hole portion 19 and the drive portion D together.

  Inserting the inner periphery of the cavity C of the workpiece W by rotating the tool body 11 around the axis O and feeding it so as to reciprocate in both directions in the direction of the axis O by the arbors A and A. Centers P (P ′) on the axis O are respectively provided by the arc-shaped cutting blades 33 of the spherical cutter insert 30 mounted on the mounting seat 22 of the end face 15 facing each insertion hole H around the holes H. Concave spherical F portions F, F having the same diameter as the spherical surface R (R ′) are formed.

  Furthermore, the feed amount of the reciprocating motion of the tool body 11 by the arbor A, A is determined by the arcuate cutting edge 33 of the insert 30 for the spherical cutter mounted on the mounting seat 22 of each end face 15 that forms each counterbore F. By setting the positions of the centers P (P ′) of the spherical surface R (R ′) formed by the rotation trajectory to coincide with each other, the recesses formed by these counterbore portions F and F formed at both ends of the cavity C The spherical surface can be a concave spherical surface along one spherical surface R.

  According to the spherical cutter insert 30 and the insert detachable spherical cutter 10 according to the present embodiment, the distal end portion of the pressing pin 24 can be inserted into the side surface 32b facing the flank 32a of the spherical cutter insert 30. Since the notch 34 is formed, the tip of the pressing pin 24 is not guided by the notch 34 and moved in a direction other than the adjustment direction, and the spherical cutter insert 30 is reliably pressed toward the adjustment direction. The position of the arcuate cutting edge 33 can be adjusted with high accuracy.

  Further, the angle α formed by the straight line perpendicular to the bottom surface portion 34a (pressed surface) of the notch 34 and the axis O in the state of being mounted on the mounting seat 22 is set within a range of 0 ° ≦ α ≦ 5 °. Therefore, the spherical cutter insert 30 is not pressed in a direction away from the wall surface 22b facing the tool body 11 in the radial direction of the mounting seat 22, and the arcuate cutting edge 33 is adjusted in the direction of the axis O. be able to. Accordingly, the spherical cutter insert 30 can be moved in the direction of the axis O along the wall surface 22b of the mounting seat 22 facing the tool body 11 in the radial direction.

  In the present embodiment, the angle is set to α = 3 °, and the straight line orthogonal to the bottom surface portion 34a (pressed surface) of the notch 34 gradually increases along the axis O as it goes outward in the axis O direction. Since the spherical cutter insert 30 is always pressed toward the wall surface of the mounting seat 22 facing the outer side in the radial direction of the tool body 11, the arcuate cutting blade 33 is inclined. Adjustment in the direction of the axis O can be performed.

  Further, an insertion hole 35 through which a clamp screw 40 having a shaft portion 41 and a contact surface 42a orthogonal to the shaft portion 41 is inserted is opened in one parallelogram surface 31a. A clamp surface 36 that is inclined so as to gradually recede toward the arcuate cutting edge 33 with respect to a plane orthogonal to the axis of the insertion hole 35 is formed around the opening of the insertion hole 35. The surface 42a and the clamp surface 36 are not in close contact with each other, and a slight gap is formed at the arcuate cutting edge 33 side portion. Therefore, when the spherical cutter insert 30 is pressed, the clamp screw 40 is easily deformed so as to bend only the gap portion, and the insert moves reliably even with a small pressing force, so that the position of the arcuate cutting blade 33 can be adjusted smoothly. It can be carried out.

  Furthermore, in the present embodiment, the intersection angle θ between the plane orthogonal to the central axis of the insertion hole 35 and the clamp surface 36 is within the range of 0 ° 10 ′ ≦ θ ≦ 15 °, more specifically, θ = 3 ° is set, the gap between the abutting surface 42a of the clamp screw 40 and the clamp surface 36 is surely formed, the deformation amount of the clamp screw 40 is secured, and the position of the arcuate cutting blade 33 is set. Adjustment can be performed smoothly, and the gap between the contact surface 42a and the clamp surface 36 can be prevented from becoming too large, and the spherical cutter insert 30 can be prevented from being insufficiently fixed.

The spherical cutter insert and the insert detachable spherical cutter according to the embodiment of the present invention have been described above. However, the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention. It is.
For example, the insert has been described as a spherical cutter insert whose outer shape is a substantially parallelogram flat plate shape, but is not limited thereto, and any shape may be used as long as it has a polygonal flat plate shape and an arcuate cutting edge.

Although the description has been made with the configuration in which the notch is configured to have an approximately L-shape when viewed from the side facing the rake face, the present invention is not limited to this, and it is only necessary that the tip of the pressing member can be inserted.
In addition, the angle α formed by the straight line orthogonal to the bottom surface and the axis is described as being set within the range of 0 ° ≦ α ≦ 5 °, but is not limited thereto. However, setting within the range of the present embodiment is preferable because the above-described effects can be obtained.

Further, although the description has been given assuming that the clamp surface is inclined with respect to the central axis of the insertion hole, the clamp surface may be configured to be orthogonal to the axis of the insertion hole.
Further, the spherical cutter insert is described as being configured to be fixed by a clamp screw, but may be fixed using a wedge member.

Further, the mounting seat has been described as having a pressing member that presses the spherical cutter insert in one direction, but a plurality of pressing members are arranged so that the spherical cutter insert can be pressed in two directions. May be.
Further, the housing hole gradually extends toward the front side in the tool rotation direction as it goes inward in the axial direction, and opens to a portion facing the front side in the tool rotation direction of the end located on the inner side in the axial direction of the mounting seat. However, the present invention is not limited to this, and as it extends toward the inner side in the axial direction, it gradually extends toward the rear side in the tool rotation direction and is directed to the portion facing the rear side in the tool rotation direction. You may perforate so that it may open.

It is the figure which looked at the mounting seat of the insert detachable spherical cutter which is the embodiment of the present invention from the front side in the tool rotation direction. It is a side view of an insert detachable spherical cutter which is an embodiment of the present invention. It is the figure which looked at the insert detachable spherical cutter shown in FIG. 2 from the axial direction. It is explanatory drawing which shows the press member provided in the attachment seat. It is explanatory drawing which shows the state with which the insert was mounted | worn with the mounting seat. It is a top view of the insert for spherical cutters which is an embodiment of the present invention. It is WW sectional drawing in FIG. It is explanatory drawing which shows a mode that a spherical counterbore process is performed with the insert detachable spherical cutter shown in FIG.

Explanation of symbols

10 Insert Removable Spherical Cutter 11 Tool Body 22 Mounting Seat 26 Press Member 30 Spherical Cutter Insert 31 Parallelogram Surface (Polygonal Surface)
32 Side 32a Flank 32b Side 33 opposite to the flank 33 Arc-shaped cutting edge 34 Notch 34a Bottom (pressed surface)
40 Clamp screw 41 Shaft part 42a Contact surface

Claims (5)

An insert detachable spherical cutter which is mounted with a spherical cutter insert having an arcuate cutting edge and forms a spherical counterbore in a cavity provided in the workpiece by the arcuate cutting blade,
A tool body that rotates about an axis, and a mounting seat is formed on an end surface facing the axial direction, and the insert for the spherical cutter mounted on the mounting seat is arranged in an adjustment direction. A pressing member that adjusts the position of the arcuate cutting blade by pressing is provided,
The spherical cutter insert has a polygonal flat plate shape, has two polygonal surfaces and side surfaces intersecting the polygonal surfaces, and one polygonal surface is a rake surface,
The one polygonal surface is formed with an arc ridge line portion that is curved toward the outer peripheral side of the polygon surface, and an arcuate cutting edge is provided on the arc ridge line portion,
A side surface connected to the arc ridge line portion is a flank surface, and a side surface disposed on the side facing the flank surface is formed with a notch portion into which the tip of the pressing member can be inserted, and the bottom surface of the notch portion An insert detachable spherical cutter characterized in that the portion is a pressed surface pressed by the pressing member.   The mounting seat is formed with a wall surface that faces the outer side in the radial direction of the tool body and contacts another side surface that intersects with the side surface of the insert for the spherical cutter, and the insert for the spherical cutter is: 2. The insert detachable spherical cutter according to claim 1, wherein the insert detachable spherical cutter is pressed by the pressing member through the pressed surface so as to be parallel to the wall surface or toward the wall surface side toward the outer side in the axial direction. .   The angle α formed by a straight line orthogonal to the pressed surface and the axis in a state of being mounted on the mounting seat is set within a range of 0 ° ≦ α ≦ 5 °. The insert detachable spherical cutter according to claim 1. An insert for a spherical cutter attached to the insert detachable spherical cutter according to any one of claims 1 to 3,
The outer shape is a polygonal flat plate, has two polygonal surfaces and side surfaces intersecting these polygonal surfaces, and one polygonal surface is a rake surface,
The one polygonal surface is formed with an arc ridge line portion curved toward the outer peripheral side of the polygon surface, and an arcuate cutting edge is provided on the arc ridge line portion,
A side surface connected to the arc ridge line portion is a flank surface, and a side surface disposed on the side facing the flank surface is formed with a notch portion into which the tip of the pressing member can be inserted, and the bottom surface of the notch portion An insert for a spherical cutter, wherein the portion is a pressed surface pressed by the pressing member. An insertion hole through which a clamp screw having a shaft portion and a contact surface orthogonal to the shaft portion is inserted is formed in the polygonal surface, and a clamp surface with which the contact surface is contacted is formed. And
5. The spherical cutter insert according to claim 4, wherein the clamp surface is inclined so as to gradually retreat as approaching the cutting edge with respect to a plane orthogonal to the axis of the insertion hole. .

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