JP2008254139A - Fine adjustment mechanism and throwaway type cutting tool equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fine adjustment mechanism having an improved work efficiency for fine adjustment and a throwaway type cutting tool equipped therewith. <P>SOLUTION: The fine adjustment mechanism finely adjusts the position of a cutting edge 13 of a cutting edge tip 10 by extruding the cutting edge tip 10 mounted to the predetermined position of a tool body 1 in the predetermined direction, and the throwaway type cutting tool is equipped with the fine adjustment mechanism. The fine adjustment mechanism is equipped with an approximately spherical pressed member 41 which is inserted in the tool body 1 and contacted to the surface of the cutting edge tip 10, a press member 31 for pressing the cutting edge tip 10 in the predetermined direction through the pressed member 41, and a locking member 51 which is engaged with the pressed member 41 and limits the movement in the predetermined direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fine adjustment mechanism for finely adjusting a cutting edge tip in a cutting tool and a throw-away type cutting tool including the same.

Conventionally, in a fine adjustment means in a throw-away reamer provided with an adjustment means for finely adjusting the position of the cutting edge of the cutting blade, a steel ball is inserted into an adjustment hole provided in the tool body, and this steel ball is used. Some of them are brought into contact with the side surface of the cutting blade and pushed out by an adjusting screw (for example, see Patent Document 1).
JP 2000-354912 A (refer to FIG. 1 and FIG. 2 (B))

  However, in the adjusting means in the throw-away type reamer described in Patent Document 1, when the cutting blade is removed, the steel ball falls off from the opening of the adjusting hole and is lost or adversely affects the workability of fine adjustment. There was a risk.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a fine adjustment mechanism that improves the workability of fine adjustment and a throw-away cutting tool including the fine adjustment mechanism.

  In order to solve the above-mentioned problem, the invention according to claim 1 finely adjusts the position of the cutting edge of the cutting edge tip by extruding the cutting edge tip mounted at a predetermined position of the tool body in a predetermined direction. A finely-adjusting mechanism for inserting a substantially spherical pressed member that is inserted into a recess provided in the tool body and is in contact with the surface of the cutting edge tip, and the cutting member in the predetermined direction via the pressed member. A fine adjustment mechanism comprising: a pressing member that pushes out a blade tip; and a locking member that engages with the pressed member together with the recess and restricts movement in the predetermined direction.

  According to the first aspect of the present invention, the cutting edge tip is pushed in the predetermined direction by the pressing member via the substantially spherical pressed member that is inserted into the recess of the tool body and contacts the surface of the cutting edge tip. Therefore, the position of the cutting edge of the cutting edge tip can be finely adjusted. Further, the engaging member is engaged so as to limit the movement of the pressed member in the predetermined direction, and the pressed member is dropped from the recess when the cutting edge tip is removed from the tool body. Therefore, it is possible to prevent adverse effects on the workability of fine adjustment.

According to a second aspect of the present invention, the portion of the locking member that engages with the pressed member has a concave conical shape, a concave spherical shape, or a concave curved surface shape. This is a fine adjustment mechanism.
A concave conical, concave spherical surface, or concave curved surface-shaped concave portion is provided in a portion of the locking member that engages the pressed member, so that the locking member securely locks the pressed member. Then, when the cutting edge tip is removed from the tool body, the pressed member is prevented from dropping from the recess.

According to a third aspect of the present invention, the portion of the recess that engages with the pressed member is a concave conical shape, a concave spherical shape, or a concave curved surface shape. This is a fine adjustment mechanism.
The concave conical, concave spherical, or concave curved concave portion provided in the inner wall surface of the recess that engages the pressed member securely locks the pressed member, and the cutting edge tip is a tool. When being removed from the main body, the pressed member is prevented from dropping from the recess.

According to a fourth aspect of the present invention, the locking member is a screw member that is screwed into a female screw hole provided in the tool body, or an elastic member that is inserted into a recess of the tool body, and the pressed member is a predetermined member. The fine adjustment mechanism according to any one of claims 1 to 3, wherein the fine adjustment mechanism is pressed in the direction.
Since the locking member positively locks the pressed member by urging the pressed member in a predetermined direction, the pressed member falls out of the recess when the cutting edge tip is removed from the tool body. To prevent this. Here, the direction in which the locking member urges the pressed member is preferably a direction that intersects the direction in which the pressing member extrudes.

According to a fifth aspect of the present invention, the pressing member is at least one screw member that is screwed into a female screw hole provided in the tool body, according to any one of the first to fourth aspects. This is a fine adjustment mechanism.
The screw member that moves forward along the axial direction of the female screw hole provided in the tool body presses the pressed member in contact with the surface of the cutting edge tip and pushes it in a predetermined direction, so that the position of the cutting edge of the cutting edge tip is easily fine. Can be adjusted.

A sixth aspect of the present invention is a throw-away cutting tool including the fine adjustment mechanism according to any one of the first to fifth aspects, wherein a cutting edge tip is provided at a predetermined position of the tool body. Is a throw-away type cutting tool, which is mounted so as to be movable in the pushing direction of the pressing member.
According to the invention described in claim 6, since the pressing member of the fine adjustment mechanism can finely adjust the edge position by pushing the cutting edge tip mounted on the throw-away cutting tool in a predetermined direction, The accuracy can be improved.

The invention according to claim 7 is characterized in that the pushing direction of the pressing member is at least one of the axial direction of the throw-away cutting tool and the direction orthogonal thereto. This is a throw-away cutting tool.
According to the seventh aspect of the present invention, the pressing member of the fine adjustment mechanism pushes the cutting edge tip attached to the throw-away type cutting tool in at least one of the axial direction of the cutting tool or the direction orthogonal thereto. As a result, the position of the cutting edge can be finely adjusted, so that the processing accuracy can be further improved.

  According to the invention described in claim 1 of the present application, the cutting edge tip is pushed out in a predetermined direction by the pressing member via the substantially spherical pressed member inserted into the recess of the tool body. The position of the cutting edge of the tip can be finely adjusted. Further, the locking member restricts the movement of the pressed member in the predetermined direction, and prevents the pressed member from dropping from the recess when the cutting edge tip is removed from the tool body. It is possible to prevent the adjustment workability from being adversely affected. Moreover, according to the throw-away cutting tool provided with this fine adjustment mechanism, the processing accuracy can be improved.

  Hereinafter, a fine adjustment mechanism to which the present invention is applied and a throw-away reamer according to a throw-away cutting tool including the same will be described with reference to the drawings. 1 to 3 are views for explaining the present throw-away reamer, FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

  The throw-away reamer according to the present embodiment includes a tool body 1 provided with a fine adjustment mechanism, and a cutting edge tip 10 mounted at a predetermined position of the tool body 1. As shown in FIGS. 1 to 3, a pair of chip pockets 2 that cut out the outer peripheral surface of the tool body 1 having a substantially cylindrical shape is formed from the tip surface of the tool body 1 toward the rear end side. It is extended. Tip seats 3 each having a notch step portion are formed at the tip portions of the wall surfaces of the chip pockets 2 facing the tool rotation direction K. These chip seats 3 have a bottom surface 3a facing the tool rotation direction K and two wall surfaces standing from the bottom surface 3a. The two wall surfaces include a radial constraint surface 3b extending in the direction of the axis CL of the tool body and an axial constraint surface 3c extending in the radial direction. Although not shown in FIG. 1 and FIG. 2, a substantially cylindrical shank portion is provided on the rear end side of the tool body 1 to be gripped by a holder such as a spindle of a machine tool or a milling chuck.

  The cutting edge tip 10 has a parallelogram plate shape, the parallelogram surface as an upper surface is a rake face 11, the parallelogram surface as a lower face is a seating surface, and the parallelogram surface is a rake face 11. A cutting edge is formed on at least one of the acute corner portions and a long side and a short side respectively extending from the corner portion, and a flank is formed on a side surface extending from the cutting edge. And the attachment hole penetrated in the thickness direction of this cutting-blade chip | tip 10 is formed in the center part of a parallelogram surface.

  The cutting edge tip 10 has a parallelogram surface to be a rake face 11 directed in the tool rotation direction K, and an acute corner portion of the parallelogram surface is a corner blade 12 protruding from the outer periphery of the tip of the tool body 1. The tip seat is such that the long side protruding from the outer peripheral surface of the tool body 1 and extending in a direction substantially parallel to the tool axis CL is the outer peripheral blade 13, and the short side protruding from the tip surface of the tool main body 1 is the front blade 14. 3 is placed. The cutting edge tip 10 is pressed and attached to the bottom surface 3a of the chip seat by screwing the tightening screw 20 inserted through the mounting hole into a female screw hole provided in the bottom surface of the chip seat 3. Here, since the female screw hole is provided closer to the radial restraint surface 3b and the axial restraint surface 3c of the chip seat than the position facing the mounting hole of the cutting blade chip 10, the cutting blade chip 10 is formed of the tool body. The radially restrained surface 15b and the axially restrained surface 15c facing the 10 side are biased so as to abut against the restraining surfaces 3b and 3c of the chip seat, respectively.

  Inside the tool body 1, a fine adjustment mechanism for finely adjusting the diameter of the outer peripheral blade 13 of the cutting edge tip is provided. The fine adjustment mechanism includes a substantially spherical pressed member 41 inserted into a recess 40 provided in the tool body 1, and the cutting edge tip 10 is moved radially outward of the tool body 1 via the pressed member 41. A pressing member 31 to be pushed out and a locking member 51 for restricting movement of the pushed member 41 in the pushing direction are provided.

  A detailed configuration of the fine adjustment mechanism in the present embodiment will be described below. In the cross section perpendicular to the axis of the tool body 1 shown in FIG. 3, a first female screw hole 30 extending in a direction substantially orthogonal to the radially constrained surface 15 b of the cutting edge tip is provided. At one end portion of the first female screw hole 30, a prepared hole drilled before processing the female screw is formed so as to open to the radial restraint surface of the chip seat, and this is the pressed member 41. It is made into the recess 40 which inserts. On the other hand, the other end of the first female screw hole 30 is open to the wall surface on the heel side of the chip pocket 2 located on the opposite side of the tool body 1 in the circumferential direction.

  Further, in FIG. 3, a second female screw hole 50 extending in a direction substantially orthogonal to the first female screw hole 30 is provided. One end of the second female screw hole 50 opens in the inner wall surface of the recess 40, and the other end opens in the outer peripheral surface of the tool body 1 located on the rear side in the tool rotation direction K of the tip seat 3. ing.

  The pressing member 31 formed of a screw member such as a hexagon socket head bolt screwed into the first female screw hole is in contact with the surface of the pressed member 41 inserted into the recess 40 at the tip portion of the pressing member 31. It is pushed out in the propulsion direction. The pressed member 41 thus pushed out contacts the radial direction restraint surface 15 b of the cutting edge tip 10 and pushes it toward the outside in the radial direction of the tool body 1.

  The locking member 51 made of a screw member such as a hexagon socket head bolt screwed into the second female screw hole comes into contact with and engages with the surface of the pressed member 41 pushed out by the pressing member 31. Thus, the pressed member 41 is prevented from falling out of the recess 40 due to the limited movement in the pushing direction. As shown in FIG. 3, a conical recess 52 is formed on the distal end surface of the locking member 51. When the center of the pressed member 41 is on the extension line of the axis of the locking member 51, the pressed member 41 is installed so as to have a slight gap between the surface of the concave portion 52 and the surface of the pressed member 41; When the pressed member 41 is pushed out by a predetermined amount by the pressing member 31 (pressed by a distance C with respect to the axis of the locking member 51 as shown in FIG. 3), the pressed member 41 becomes the surface of the recess 52. And the inner wall surface of the recess 40 so as to be sandwiched and engaged so that it is not pushed out any further.

  As shown in FIG. 2, the fine adjustment mechanism having the above-described configuration is equally provided at two positions on the front end side and the rear end side with the intermediate point (mounting hole) of the cutting edge tip 10 in the direction of the tool axis CL. ing.

  A method for finely adjusting the position of the cutting edge of the cutting edge tip 10 by the fine adjustment mechanism described above will be described below. The cutting edge tip 10 is mounted on the tool body 1 while sitting on the bottom surface 3a of the tip seat and in contact with the radial direction restraining surface 3b and the axial direction restraining surface 3c. Thereafter, the pressing member 31 is screwed to be pressed in the propelling direction of the pressing member 31 via the pressed member 41. Here, the cutting edge tip 10 is movable in the radial direction of the present throwaway reamer and can be rotated around the fastening screw by elastic deformation of the fastening screw. Therefore, when the pressing force of the pressing members 41 positioned on the front end side and the rear end side of the cutting blade tip 10 is equalized, the cutting edge tip 10 remains in contact with the bottom surface of the tip seat 3 in the present throwaway. When the outer peripheral blade 13 is pushed out to the outside in the radial direction of the type reamer and is pushed out so as to increase its diameter, and the pressing force of each pressing member 41 is uneven, it is in a state of being in contact with the bottom surface 3a of the chip seat. It is rotated by the larger pressing force around the fastening screw 20 as it is, and the diameter of the outer peripheral blade 13 is enlarged and the back taper is finely adjusted. If the screwing of the pressing member 41 is stopped when the outer peripheral blade 12 of the cutting edge tip reaches a desired position, the cutting force of the cutting edge tip 10 is balanced with the pressing force of the fastening screw 20 and the pressing force of the pressing member 41. Can remain immobile. The amount of enlargement of the diameter of the outer peripheral blade 13 described above is limited by the amount of elastic deformation of the tightening screw and the amount of movement of the pressed member 41 in the fine adjustment mechanism, but is set to a maximum of about 0.2 mm in consideration of practical aspects. It is desirable to be done.

  According to this fine adjustment mechanism and the throw-away reamer, the diameter and back taper of the outer peripheral blade 13 of the cutting edge tip 10 can be finely adjusted, so that the accuracy of the machining hole can be improved. Further, when the cutting edge tip 10 is extracted from the tip seat 3, the pressed member 41 does not engage with the locking member 51 and fall off from the recess 40. In this case, the pressed member 41 is not lost, and the workability of fine adjustment can be prevented from being deteriorated.

  As shown in FIG. 3, it is desirable that a concave conical recess 42 be provided on the inner wall surface of the recess 40 facing the distal end surface of the locking member 51. In this case, the pressed member 41 is sandwiched between a conical recess 52 provided in the locking member 51 and a conical recess 42 provided on the inner wall surface of the recess 40. When a predetermined amount is pushed out by the contact, it is not pushed out any more by contacting and engaging the surfaces of the concave portions 52 and 42. The concave portion 42 of the inner wall surface of the concave portion 40 is formed by a conical tip cutting edge of a drill for machining the pilot hole of the second female screw hole, and the center thereof is located on the extension line of the axis of the locking member 51. It is formed to do. As described above, the pressed member 41 is sandwiched between the two recesses 52 and 42, so that the pressed member 41 can be reliably prevented from falling out of the recess 40 and can easily move in the recess 40. Therefore, fine adjustment becomes easy. Thus, when the recessed part 42 is provided in the inner wall face of the recess 40, the front-end | tip part of the locking member 51 does not require the recessed part 52, and forms the flat surface orthogonal to the axis line of this locking member 51. Also good.

  The shape of the recess 52 provided on the distal end surface of the locking member 51 and the shape of the recess 42 provided on the inner wall surface of the recess 40 are not limited to a concave cone shape, and are, for example, a concave spherical shape or a concave curved shape. Also good.

  The pressed member 41 is preferably substantially spherical in consideration of the point contact with the surface of the pressing member 31 and the cutting edge tip 10 at a substantially fixed position, and the fine workability of repeated fine adjustment is improved. .

  In the embodiment described above, as a means for clamping the cutting edge tip 10, in addition to the tightening screw, a presser plate or a wedge member that presses and clamps the upper surface of the cutting edge tip 10 downward may be used. It doesn't matter.

Also, the type of cutting tool is not limited to the throw-away type reamer, but if it is equipped with a cutting edge tip, the throw-away type bite, the throw-away type face mill, the throw-away type end mill, the throw-away type You may apply to cutting tools, such as a drill.
Needless to say, the fine adjustment mechanism is not limited to pushing the cutting edge tip 10 in the direction perpendicular to the axis CL of the tool body, and can be applied to pushing the chip 10 in the direction of the axis CL.

  For the locking member 51, an elastic member such as a coil spring or a ball plunger may be used instead of the screw member such as the hexagon socket head bolt described above. When these elastic members are used, the pressing force acting on the contact portion with the pressed member is set to a pressing force that does not hinder the movement of the pressed member 41 pushed by the pressing member 31 in the pushing direction. Has been.

It is a front view of the throw away type reamer to which the present invention is applied. It is a top view of the throw away type reamer to which the present invention is applied. It is the sectional view on the AA line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tool main body 2 Chip pocket 3 Chip seat 10 Cutting blade tip 13 Outer peripheral blade 14 Front blade 20 Clamping screw 30 First female screw hole 31 Pressing member 40 Recess 41 Pressed member 42 Recess 50 on the inner wall surface of the recess Female screw hole 51 Locking member 52 Recessed portion of locking member

Claims (7)

A fine adjustment mechanism for finely adjusting the position of the cutting edge of the cutting edge tip by extruding the cutting edge tip mounted at a predetermined position of the tool body in a predetermined direction,
A substantially spherical pressed member that is inserted into a recess provided in the tool body and contacts the surface of the cutting edge tip;
A pressing member that pushes the cutting edge tip in the predetermined direction through the pressed member;
A fine adjustment mechanism comprising: a locking member that engages with the pressed member together with the recess to restrict movement in the predetermined direction. 2. The fine adjustment mechanism according to claim 1, wherein a portion of the locking member that engages with the pressed member has a concave conical shape, a flat surface, a concave spherical shape, or a concave curved shape. 3. The fine adjustment mechanism according to claim 1, wherein a portion of the recess that engages with the pressed member has a concave conical shape, a concave spherical shape, or a concave curved shape. The locking member is a screw member screwed into a female screw hole provided in the tool body, or an elastic member inserted into a recess of the tool body, and presses the pressed member in a predetermined direction. The fine adjustment mechanism according to any one of claims 1 to 3. The fine adjustment mechanism according to claim 1, wherein the pressing member is at least one screw member that is screwed into a female screw hole provided in the tool body. A throw-away cutting tool including the fine adjustment mechanism according to any one of claims 1 to 5,
A throw-away cutting tool, wherein a cutting edge tip is mounted at a predetermined position of the tool body so as to be movable in a direction in which the pressing member is pushed out. The throw-away cutting tool according to claim 6, wherein a direction in which the pressing member is pushed out is at least one of an axial direction of the throw-away cutting tool and a direction orthogonal thereto.

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