JPH05138423A - Tip clamping mechanism of face milling cutter - Google Patents

Abstract

PURPOSE:To provide a tip clamping mechanism which is excellent in the steadiness of clamping action and can surely prevent a problem that a face milling cutter rotated at high speed has possibility of an edge tip being shifted or flown out from an edge groove under centrifugal force. CONSTITUTION:An edge groove 10 provided at a fixed position on the outer periphery of a cutter body 9 is formed into a groove which is opened toward the front of the body 9 and cylindrical (square cylinder-shaped in a drawing) in the direction of a cutter axial center. An edge tip 1 whose inserting part to the edge groove is formed into a shape corresponding to the edge groove is fitted in the edge groove 10, and pressurizedly fixed with a pressing metal member 2 to move a wedge face 1a provided on the outer periphery of the inserting part in a direction rectangular to the edge groove 10. The edge tip 1 and the edge groove 10 are thus precisely machined and mutually fitted to improve the stability of the edge tip 1. In addition, since the movement caused by centrifugal force of the edge tip in the radial direction of the cutter is checked by the cutter body 9, the steadiness of clamping action is kept even in the case of the high speed rotation of the cutter, and the shifting and flying out of the edge tip can therefore be surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping mechanism for a cutting edge tip used in a face milling cutter. For more information,
The present invention relates to a clamp mechanism having a function of preventing chips from popping out by centrifugal force.

[0002]

2. Description of the Related Art A method using a wedge piece is often used for clamping a cutting edge tip in a front milling cutter. In this method, the tip has a blade groove opened on both the front surface and the outer peripheral surface of the cutter body. Since it is inserted and held only by the frictional force, if a strong centrifugal force acts due to the high-speed rotation of the cutter, there is a concern that the chip may shift during use or may pop out from the blade groove.

Therefore, as shown in FIG.
It is considered that the width of the outlet of the blade groove 10 provided in the cutter body 9 is narrowed by increasing the thickness of the blade on the center side of the cutter.

[0004]

In the clamp mechanism shown in FIG. 8, it is difficult to machine the acute-angled corner portion a of the blade groove 10 and the acute-angled corner portion b of the groove 11 into which the presser foot 2 is press-fitted.
The shape accuracy of the tip 1 and the blade groove 10, the presser foot and the wedge groove 11 may be deviated to deteriorate the blade runout accuracy, or the clamp may become unstable and the tip may slightly shift due to centrifugal force. Further, the presser foot is loosened due to the cutting vibration, which also causes the chip to shift, which is unreliable.

The present invention eliminates such drawbacks and facilitates presetting of cutting edge tips and securing of blade runout accuracy, and
The challenge is to improve the stability of the clamp at high speeds.

[0006]

In order to solve the above problems, the present invention is a presser foot for inserting a cutting blade tip into a blade groove provided at a predetermined position on the outer periphery of a cutter body and press-fitting it between the cutter body and the cutter body. In the tip clamp mechanism of the front milling cutter that is detachably clamped with, the blade groove is a tubular groove in the axial direction of the cutter that opens to the front of the cutter body, and the presser foot faces the middle of the blade groove in the longitudinal direction. The cutting blade tip is arranged so as to advance and retreat in a direction perpendicular to the groove, and the cutting tip has a wedge and a presser foot that presses the outer periphery of this insertion portion with a size and cross-sectional shape that correspond to the blade groove. The surface is provided.

Incidentally, the blade groove may be formed in a cylindrical shape when the workability is important, and may be formed in a square tube shape when the turning stop of the cutting blade tip is important.

[0008]

[Function] The cylindrical blade groove and the cutting blade tip to be inserted into this groove are
Since it is a simple mating fitting, it can be processed with high accuracy, and it is possible to eliminate the deviation of the shape accuracy and stabilize the sitting of the chip. Also, with the fitting structure, even if the presser foot slightly shifts due to centrifugal force during high-speed rotation, the cutter body receives the cutting edge tip, so the tip position does not change, and for that reason, the presser foot Loosening is less likely to occur.

Further, since the presser foot can be advanced and retracted in a direction perpendicular to the direction of inserting the tip into the blade groove, the amount of insert of the tip into the blade groove can be adjusted. Therefore, the accuracy of blade runout can be improved by adjusting the amount of insertion. Will also be possible.

If the blade shake adjusting mechanism as described in the embodiment is used in combination, it is possible to adjust the blade shake in a wide range quickly, reliably and accurately.

[0011]

1 to 4 show a first embodiment of the present invention.
In the figure, 1 is a cutting edge tip, 2 is a presser foot, 3 is a W screw for a clamp for propelling the presser foot, 4 is a blade runout adjusting mechanism, 9 is a cutter body, 10 is a blade groove, 11 is a presser foot press-fitting groove. Is.

The cutting edge tip 1 is formed into a prismatic shape and the blade groove 1 is formed.
A wedge surface 1a is provided on the front surface of the insertion portion into the 0. Further, the presser foot 2 is arranged so as to face the blade groove 10 in the middle of its longitudinal direction and to move back and forth in a direction perpendicular to the blade groove. This presser foot 2
Has a clamp surface 2a at the front portion which is pressed against the wedge surface 1a, and a wedge angle for press fitting is attached to the clamp surface 2a, and the back surface is parallel to the axis of the W screw 3.

One end of the W screw 3 is screwed into the presser foot 2, and the other end of the screw opposite to the one end is screwed into a screw hole provided in the cutter body.

The blade groove 10 is formed in a rectangular tube shape so that the cutting blade tip 1 having a corresponding shape is fitted and fitted. By doing so, the cutter body can prevent the cutting blade tip from moving outward in the radial direction of the cutter due to the centrifugal force, and the cutter body can prevent the tip from being displaced even if the presser foot 2 is slightly shifted by the centrifugal force. The displacement of 1 does not occur. Further, since the friction with the tip is maintained, the presser foot 2 is unlikely to loosen. Further, the blade groove 10 is made into a square groove, and the cutting blade tip 1
The non-circular fit of the also ensures a stable detent of the cutting edge tip.

As shown in the drawing, a slit 12 is provided on the outer circumference of the cutter body 9 so that the thin portion 13 outside the blade groove 10 can be elastically deformed, and the thin blade portion 13 elastically moves the cutting blade tip 1. It is convenient for the cutting blade tip 1 to be held so that the cutting blade tip 1 does not naturally drop even when the presser foot 2 is loosened and the presser foot 2 is loosened.

Next, as shown in FIG. 3, the illustrated blade runout adjusting mechanism 4 includes an adjusting piece 5 and a W screw 6 for propelling this piece.
And an adjusting piece 7 interposed between the adjusting piece 5 and the cutting blade tip 1, and a bar magnet 8 embedded in the cutting blade tip 1.

The adjusting piece 5 is for adjusting the amount of insertion of the cutting blade tip into the blade groove to adjust the blade runout in the axial direction of the cutter, and one surface parallel to the propulsion direction is the cutter body 1.
Touches. Also, the other side is 5-10 ° to the propulsion direction.
The adjusting piece 7 is brought into contact with the wedge surface 5a having a certain angle. One end of the W screw 6 is the adjustment piece 5
In addition, the other end of the screw opposite to the one end is screwed into a screw hole provided in the cutter body.

The adjusting piece 7 is detachably attached to the cutting blade tip 1 by the magnetic force of the bar magnet 8. This adjustment piece is provided to widen the adjustment range of the blade runout. That is, among known adjustment mechanisms of this type, there is one that adjusts the position of the cutting edge by directly abutting the cutting edge tip on the wedge surface of a piece similar to the illustrated adjustment piece and moving the piece to change the position of the wedge surface. However, since the adjustment accuracy of this mechanism is affected by the wedge angle of the wedge surface of the bridge, the wedge angle of the wedge surface must be loosened when high precision adjustment is required. However, if the wedge angle is loosened, the adjustment range is narrowed and the adjustment cannot be performed sufficiently.

On the other hand, the adjusting piece 7 can be replaced with one having a different length. By this replacement, the lengths of the plurality of cutting blade tips 1 provided on the same cutter can be adjusted by the adjusting piece 5. Even if there are variations, the tip position of each tip can be accurately aligned by performing macro adjustment with the adjustment piece 7 and micro adjustment with the adjustment piece 5.

An external preset is possible for macro adjustment. Also, if this macro adjustment is performed, the adjustment piece 5
Since the adjustment amount due to is small, the adjustment time can be shorter than before even if the adjustment range is widened.

Although the bar magnet 8 is preferable, the adjusting function is maintained even if the bar magnet 8 is omitted.

If it is not necessary to widen the adjustment range, the cutting piece 7 can be omitted and the cutting blade tip can be directly applied to the adjustment piece 5.

Further, since the illustrated clamp mechanism can absorb the deviation of the length of the tip by the difference in the amount of the tip inserted into the blade groove, the blade runout can be adjusted with reference to the cutting edge without the adjusting mechanism 4 itself. ..

5 to 7 show a second embodiment of the present invention. This clamp mechanism is different from the first embodiment in that the blade groove 10 is a cylindrical groove and the cylindrical cutting blade tip 1 is fitted and fitted, and the slit 12 in FIG. 4 is omitted.

As described above, the effects obtained by circularly fitting the blade groove 10 and the cutting blade tip 1 are not so different. In this structure, since the rotation of the cutting blade tip 1 is stopped by the presser foot 2, the load of the presser foot is slightly increased, but the processing of the blade groove is easier than that of the square blade groove.

Further, since the blade groove 10 is not opened to the outer periphery of the cutter body, the blade groove is not pushed open by press-fitting the presser foot, and distortion and deformation of the body are reduced. Regarding this point, the same effect can be obtained also in the first embodiment by omitting the slit 12.

[0027]

As described above, according to the present invention, the cutting groove is formed into a square groove or a round groove and is opened in the front surface of the cutter body, and the cutting blade tip having a corresponding shape and size is fitted and fitted. Since the clamp body is clamped with a presser foot that moves forward and backward in a direction perpendicular to the blade groove, the movement of the cutting blade tip in the cutter radial direction is restrained by the cutter body, and the stability of the clamp does not deteriorate even at high speed rotation. The shifting and popping out due to the centrifugal force can be reliably prevented, and the processing stability and processing accuracy are improved.

Further, in the case where the blade shake adjusting mechanism having the adjusting piece is additionally provided, the blade shake adjusting becomes easier than ever, and the adjusting range is widened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a presser foot portion according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same clamping mechanism as above.

FIG. 3 is a sectional view showing details of a blade shake adjusting mechanism.

FIG. 4 is an external perspective view of the above clamp mechanism.

FIG. 5 is a cross-sectional view of a presser foot portion of another embodiment.

FIG. 6 is a vertical sectional view of the same.

FIG. 7 is an external perspective view of the clamp mechanism shown in FIGS.

FIG. 8 is a front view showing an example of a conventional clamp mechanism provided with measures against centrifugal force.

[Explanation of symbols]

 1 Cutting edge tip 1a Wedge surface 2 Presser foot 2a Clamping surface 3 W screw 4 Blade runout adjusting mechanism 5 Adjustment piece 5a Wedge surface 6 W screw 7 Adjustment piece 8 Bar magnet 9 Cutter body 10 Blade groove 11 Presser foot press-fitting groove 12 Slit 13 Thin part

Claims (5)

[Claims] 1. A tip clamping mechanism for a front milling cutter, wherein a cutting blade tip is inserted into a blade groove provided at a predetermined position on the outer circumference of a cutter body, and is removably clamped by a presser foot that is press-fitted between the cutter body and the cutter body. The blade groove is a cylindrical groove in the cutter axial direction that opens to the front of the cutter body, and the presser foot is arranged so as to face the middle of the blade groove in the longitudinal direction and advance and retreat in a direction perpendicular to the blade groove. A chip clamping mechanism for a front milling cutter, characterized in that the insertion portion into the blade groove has a size and a cross-sectional shape corresponding to the blade groove, and a wedge surface for pressing with a presser foot is provided on the outer periphery of the insertion portion. .. 2. A blade runout adjusting mechanism for changing the blade tip position of the cutting blade tip by advancing and retracting an adjusting piece having a wedge surface in a direction perpendicular to the blade groove to displace the wedge surface, which is the position reference of the blade edge, in the cutter axial direction. The tip clamp mechanism for a front milling cutter according to claim 1, wherein the tip clamping mechanism is provided at a rear end portion of the blade groove. 3. A chip clamping mechanism for a front milling cutter according to claim 2, wherein a detachable adjusting piece is provided between the piece and the cutting blade tip and held by the cutting blade tip. 4. The blade groove is formed in a cylindrical shape,
The tip clamp mechanism of the front milling cutter according to 2 or 3. 5. The blade groove is formed in a rectangular tube shape,
The tip clamp mechanism of the front milling cutter according to 2 or 3.