JP2516135Y2 - Indexable cutter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention provides a finishing throw away type cutter having a front cutting edge, which can easily and accurately adjust the position of the front cutting edge and which has high rigidity. To do.

[0002]

2. Description of the Related Art Generally, a finishing cutter has a front cutting edge with a wide cutting width on an outer peripheral end surface of a tool body, and the finishing cutting is performed by the cutting edge. In particular, a throw-away type cutter (hereinafter, abbreviated as a cutter) that uses a throw-away tip (hereinafter, abbreviated as a tip) for a cutting edge does not require re-grinding and the tool body is semi-permanently. It is widely used because it can be used and the tool cost can be reduced.

Among conventional cutters of this type, a cartridge whose position can be adjusted in the axial direction is provided with a cutting blade to facilitate the position adjustment of the cutting blade.
What is found in 0-186311 is disclosed.
Examples of these conventional cutters are shown in FIGS. In this cutter, a tip pocket 2 formed by removing a part of the tool pocket 1 toward the outer periphery is formed on the outer periphery of an annular tool body 1 rotated about an axis.
A concave portion 3 is formed at the rear of the cutting rotation direction. A cartridge 4 is mounted in the recess 3 with a fixing screw 5 with its side surface abutting the bottom surface of the recess 3, and the front end of the cartridge 4 is substantially parallel to the surface of the work material. A chip 7 having a blade 6 is detachably attached by a screw 8 or the like. On the other hand, a wedge 9 is attached to the axially proximal end portion of the cartridge 4 by a clamp screw 10, and the tool body 1 is rotated by rotating the clamp screw 10.
It is possible to adjust the position of the cartridge 4 along the axial direction.

[0004]

Generally, in the cutter, it is necessary to adjust the position of the cutting edge, that is, the so-called runout adjustment, in order to improve the finished surface roughness of the work material after exchanging the tip. In such a case, in the above-mentioned conventional cutter, the clamp screw 10 is rotated to move the wedge 9 into the recess 3.
The shake is adjusted by pushing it in and pushing the cartridge 4 in the axial direction of the tool body 1. However, the amount of change in the axial width of the wedge 9 pushed into the recess 3 by the rotation of the clamp screw 10 and the amount of movement of the axial width of the cartridge 10 pushed out in the same direction as a result are Therefore, there is a problem that a slight difference in rotation of the clamp screw 10 causes a large change in the pushing width of the cartridge 4 and it is difficult to adjust the shake.

[0005]

According to the present invention, there is provided a bottom surface of a concave portion opened in a tip surface of a tool body, the bottom surface facing the tip side of the tool body.
To gradually said destination toward the other end from one end of said recess
An inclined surface projecting to the end side is formed, and a chip is mounted in the recess so that the front cutting edge projects to the tip side.
Along with the inclined surface and the tool book on the inner surface
Fixed with taper that gradually expands toward the tip side of the body
If a cartridge with holes is inserted in this fixing hole,
With a connecting member in which the contact portion with the taper is spherical.
Detachable in the recess and move along the inclined surface
A wedge member is inserted in a gap between one end of the cartridge in the direction along the inclination of the inclined surface and the side wall of the recess, and the other end of the cartridge is inserted between the recess and the recess. It is a throw-away type cutter for finishing with an adjustment gap provided in.

[0006]

In the present invention, when the wedge member is pushed in, the side wall of the cartridge contacting the wedge member is pressed along the inclined surface, and as a result, the connecting member bends in the pressing direction,
The cartridge moves in the direction of narrowing the adjustment gap on the inclined surface while being fixed in the recess.

Here, the tip moves in the axial direction of the tool main body in accordance with the amount of change in the width of the wedge member that has been pushed in. If the inclination of the inclined surface is made sufficiently small, the distance traveled along the inclined surface of the cartridge will be described. The movement distance of the cartridge in the axial direction with respect to is reduced. Therefore, the movement distance of the tip in the axial direction due to the change in the pushing amount of the wedge member is reduced, and the change in the shake amount of the tip is reduced. Therefore, it is possible to easily and accurately adjust the deflection of the chip.

[0008]

Embodiments of the present invention will now be described in more detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. The tool body 1 has an annular shape as shown in FIG. 1, and on the arc centered on the axis of the tool body tip surface 1A, the tool body tip surface 1A is cut in the proximal direction along the tangential direction to the arc. A recessed portion 3 which is lacking is provided. And
The bottom surface of the recessed portion 3 has an inclined surface 11 whose longitudinal direction gradually projects toward the tip end side in the axial direction of the tool body as it goes from the rear end of the recessed portion 3 along the rotational direction of the tool body 1 (arrow X in FIG. 1) toward the tip.
And are formed to have the same height in the direction orthogonal to the longitudinal direction.

A substantially trapezoidal cartridge 4 is provided in the recess 3.
The fixing hole 12 is provided in the cartridge 4 in a direction perpendicular to the inclined surface 11, and the inner circumference of the fixing hole 12 is tapered toward the tool body front end surface 1A. On the other hand, the fixing screw 5 made of an elastic material is inserted into the fixing hole 12, and its head has a spherical surface along the axis of the screw, and the maximum diameter of the head is the inner diameter of the fixing hole 12. It is set to be the minimum diameter or more and less than the maximum diameter. As a result, the cartridge 4 has the fixing holes 12 as shown in FIG.
The taper portion and the spherical surface portion of the head portion are brought into surface contact with each other to be pressed and fixed in the concave portion 3.

For the purpose of assisting the bending of the fixing screw 5, a diameter-reduced portion 5 is formed between the head of the fixing screw 5 and a portion screwed into the tool main body 1, the diameter of which is reduced.
In addition to the formation of A, a counterbore portion 15A is formed in the upper part of the screw hole 15 for the fixing screw 5 provided on the inclined surface 11 and whose diameter is enlarged by the counterbore.

Further, the front end surface 1 of the tool body of the cartridge 4
A mounting recess 13 is formed at the tip on the A side, and a substantially square plate-shaped chip 7 is detachably mounted in the mounting recess 13 with a screw 8 with its ridge protruding from the tool body front end surface 1A. The front cutting edge 6 is formed on the ridge. The front cutting edge 6 is parallel or convex to the tool body boss surface 1B as shown in FIG.

Further, a wedge 9 is inserted between the side wall of the recess 3 on the rear end side in the rotational direction and the cartridge 4 such that the end face on the narrow width side faces the bottom side of the recess 3. Here, the wedge 9 is attached by a clamp screw 10 so as to be movable along a substantially axial direction of the tool body 1. on the other hand,
An adjustment gap 14 is provided between the cartridge 4 and the tip end side of the recess 3 in the rotation direction.

The deflection adjustment in the cutter of the present invention is performed by changing the pushing amount of the wedge 9 into the concave portion 3. That is, when the clamp screw 10 is rotated and the wedge 9 is pushed into the recessed portion 3, the side wall of the cartridge 4 in contact with the wedge 9 is pressed along the inclined surface 11, and the fixing screw 5 bends in the pressing direction. The cartridge 4 moves on the inclined surface 11 in a direction of narrowing the adjustment gap 14, and projects in the axial direction of the tool body 1 according to the inclination of the inclined surface 11. In this embodiment, when the clamp screw 10 is rotated in the direction in which the wedge 9 is pushed, the cartridge 4 moves to the right in FIG.
The height of the cutter increases.

In this case, with respect to the amount of change in the width in the axial direction of the wedge 9 pushed into the recess 3 by the rotation of the clamp screw 10, as a result, the width in the same direction of the cartridge 4 pushed out in the same direction. Because the movement amount is small, clamp screw 1
It is possible to finely adjust the pushing amount of the cartridge 4 by rotating 0.

On the other hand, as described above, the inner periphery of the fixing hole 12 is tapered, and the fixing screw 5 is made of an elastic material, and the head of the fixing screw 5 is spherical, so that the cartridge is formed. When the position of the axis line of the fixing hole 12 and the axis line of the fixing screw 5 deviates due to the movement of 4, the fixing screw 5 bends in the deviating direction, and as a result, the head portion of the fixing screw 5 and the fixing hole 5 Since the taper portion 12 and the taper portion 12 continuously come into surface contact with each other at the tapered portion, the cartridge 4 is always reliably fixed to the tool body 1.

Here, the tip surface 1A of the tool body of the inclined surface 11
The inclination angle θ with respect to may be appropriately determined according to the tool diameter and the like, but is preferably 5 ° to 30 °. If the angle is less than 5 °, the amount of movement of the width of the cartridge 10 in the axial direction with respect to the amount of change of the width of the wedge 9 pushed into the recess 3 in the axial direction becomes extremely small during the shake adjustment, and the shake adjustment can be performed. On the other hand, if it exceeds 30 °, the amount of movement of the width of the cartridge 10 in the axial direction relative to the amount of change of the width of the wedge 9 pushed into the recess 3 in the axial direction at the time of adjusting the shake. This is because there is a risk that it becomes large and it becomes difficult to finely adjust the shake. On the other hand, in this embodiment, the clearance angle α of the front flank that is continuous with the front cutting edge 6 is the same as the inclination angle θ.

In the cutter of the present invention, since the recess 3 is opened only on the front end surface 1A side of the tool body, the rigidity of the tool body 1 due to the opening of the recess 3 is less than that of the conventional cutter. Further, since the cutting load is received by the entire inclined surface 11 having a relatively large area, the mounting rigidity is higher than that of the conventional cutter, and thus the stability during cutting is also high.

[0019]

As described above, in the present invention, when the wedge member is pushed in, the side wall of the cartridge which is in contact with the wedge member is pressed along the inclined surface, and accordingly the connecting member is bent in the pressing direction. As a result, the cartridge could always be reliably fixed in the recess regardless of the movement of the position on the inclined surface of the cartridge. On the other hand, the tip moves in the axial direction of the tool main body in accordance with the amount of change in the width of the wedge member that has been pushed in. Here, since the slope of the inclined surface is made sufficiently small, the tip moves in the longitudinal direction. Both the movement distance of the cartridge in the axial direction and the movement distance of the chip in the axial direction due to the change in the pushing amount of the wedge member were reduced, and the change in the shake amount of the chip could be reduced. Therefore, it has become possible to easily and accurately adjust the deflection of the chip.

[Brief description of drawings]

FIG. 1 is a plan view of a cutter showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of the cutter showing the orientation of the front cutting edge with respect to the tool body boss surface in the first embodiment of the present invention.

FIG. 3 is a cutter I showing the structure of the first embodiment of the present invention.
It is sectional drawing which followed the II-III line.

FIG. 4 is a partial side view of a cutter showing a structure of a conventional cutter.

FIG. 5 is a partial cross-sectional view of a cutter showing the structure of a conventional cutter.

[Explanation of symbols]

 1 Tool Main Body 1A Tool Main Body Tip Surface 1B Tool Main Body Boss Surface 2 Chip Pocket 3 Recess 4 Cartridge 5 Fixing Screw 5A Reduced Diameter Part 6 Front Cutting Edge 7 Throw-away Tip (Chip) 8 Screw 9 Wedge 10 Clamp Screw 11 Inclined Surface 12 Fixed Hole 13 Mounting recess 14 Adjustment gap 15 Screw hole 15A Counterbore part α Clearance angle of the front flank that is continuous with the front cutting edge θ Angle of inclination of the inclined surface with respect to the tip of the tool body

Claims (1)

(57) [Scope of utility model registration request] 1. A concave portion that opens to the tip surface of the tool body is formed at the tip end portion in the axial direction of the tool body having an annular shape,
A cartridge holding a flat throw-away tip is attached to this recess with its side surface in contact with the bottom surface of the recess, and a wedge member is inserted between the cartridge and the side wall of the recess, In the cartridge,
The throw-away tip is mounted in a state in which a front cutting edge formed on the ridge side thereof is projected to the tip side of the tool body, and the cutting edge is changed by changing the pushing amount of the wedge member into the concave portion. In the finishing throw-away cutter for adjusting the amount of runout, the bottom surface of the recess is a surface facing the tip side of the tool body, and the bottom surface extends from one end of the recess to the other end. Accordingly, an inclined surface that gradually protrudes toward the tip side of the tool body is formed, and is inserted into the recess so as to be movable along the inclined surface.
And the work on the inner surface is perpendicular to the inclined surface.
A solid taper with a taper that gradually expands in diameter toward the tip of the tool body.
The cartridge with a fixed hole is inserted into this fixing hole.
And a connecting portion whose contact portion with the taper is spherical
Member is removably mounted in the recess, and the wedge member is inserted into a gap between one end of the cartridge in the direction along the inclined surface and the side wall of the recess while the other end of the cartridge is inserted. A finishing throw-away cutter for finishing, characterized in that an adjusting gap is provided between the portion and the side wall of the recess.