JP2592189B2 - Tip clamp mechanism for face milling cutter - Google Patents

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 a tip from popping out due to centrifugal force.

[0002]

2. Description of the Related Art A method using a wedge piece is often used for clamping a cutting edge chip in a front milling cutter. In this method, a chip is formed in a blade groove opened on both a front surface and an outer peripheral surface of a cutter body. Since the insert 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 tip may shift during use and jump out of the blade groove.

[0003] Therefore, as shown in FIG.
A method has been considered in which the width of the outlet of the blade groove 10 provided in the cutter body 9 is reduced by increasing the thickness of the blade at the center side of the cutter.

[0004]

In the clamping mechanism shown in FIG. 8, it is difficult to machine the sharp corners a of the blade grooves 10 and the sharp corners b of the grooves 11 into which the presser foot 2 is press-fitted.
In some cases, the shape accuracy of the tip 1 and the blade groove 10 and the shape accuracy of the presser foot and the wedge groove 11 are shifted to deteriorate the blade runout accuracy, and the clamp becomes unstable, causing a minute shift of the chip due to centrifugal force. Further, the presser foot becomes loose due to the cutting vibration, which also causes a chip shift. Here, Japanese Patent No. 105713 specification
The book (1980 announcement No. 78) has a spiral shape on the side
Insert the sharpened blade (rod-shaped tip) into the holding hole provided in the main body.
Insert the side of this cutting edge into the spiral on that side.
The cutter is shown tightened with a wedge
You. This cutter tries to rotate the cutting blade with the cutting force
And wedge tightening by the action of the spiral and reed on the side
Although the attachment is said to be strong, spy on the side of the cutting blade
It is currently not possible to provide equal leads on the wedge surface
Even with existing technology, it is almost impossible and practical
No. In addition, a reference surface for blade position adjustment and a blade runout adjustment mechanism are provided.
Not provided, and the amount of insertion of the
In other words, the cutting edge rotates due to the engagement between the spiral side and the wedge
Therefore, it is also difficult to determine the direction and position of the cutting edge with high accuracy.

The present invention eliminates such drawbacks and facilitates presetting of a cutting edge tip and securing of blade runout accuracy, and
The object is to increase the stability of the clamp at high speed rotation.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a presser foot which inserts a cutting blade tip into a blade groove provided at a predetermined position on the outer periphery of a cutter body and press-fits the same with the cutter body. In the tip clamping mechanism of a front milling cutter, which is detachably clamped with a cutter, the blade groove is a cylindrical groove in the cutter axial direction which is opened to the front surface of the cutter body, and the presser foot is positioned halfway in the longitudinal direction of the blade groove. The cutting edge tip is arranged so as to advance and retreat at right angles to the groove, and the cutting edge tip is formed into a size and a cross-sectional shape corresponding to the blade groove, and a wedge is pressed against the outer periphery of the insertion portion with a presser foot. The shape has a surface. Then, adjust the adjustment piece at right angles to the blade groove with a screw.
The wedge surface provided on the adjustment piece to the cutter axis
Direction, and use this wedge surface as the
The blade runout adjustment mechanism that changes the position of the blade tip is
Provided at the back end of the groove. In addition, this blade tip adjustment mechanism
The above adjustment piece and cutting edge tip
With an adjustment piece interposed between them.

[0007] The blade groove is preferably formed in a cylindrical shape when emphasis is placed on workability, and is formed in a rectangular cylindrical shape when emphasis is placed on preventing rotation of the cutting blade tip.

[0008]

[Function] A cylindrical blade groove and a cutting blade tip inserted into this groove are:
Since it is a simple fitting fit, it can be machined with high accuracy, and the deviation of the shape accuracy can be eliminated and the seating of the chip can be stabilized. In addition, if the fitting structure is used, even if the presser foot is slightly shifted by centrifugal force at the time of high-speed rotation, the cutter body receives the cutting edge chip, so that the tip position does not fluctuate. Looseness itself is less likely to occur.

Further, the amount of insert into the blade groove can be adjusted by moving the presser foot in a direction perpendicular to the direction of insertion of the insert into the blade groove, so that the run-out accuracy can be improved by adjusting the insertion amount. Also becomes possible.

In addition, since a blade runout adjusting mechanism is provided,
A wide range of blade runout adjustment can be performed quickly, reliably, and accurately. In addition, the adjustable blade tip adjustment mechanism
Includes trimming pieces, resulting in uneven cutting tip length
Even if exceeds the adjustable range of the adjustment piece,
To adjust blade run with high precision by absorbing
Can be.

[0011]

1 to 4 show a first embodiment of the present invention.
In the drawing, 1 is a cutting edge tip, 2 is a presser foot, 3 is a W screw for clamping for pushing the presser foot 2, 4 is a blade runout adjusting mechanism, 9 is a cutter body, 10 is a blade groove, and 11 is a presser foot press-in groove. It is.

The cutting blade tip 1 is formed in a prismatic shape and has a blade groove 1.
A wedge surface 1a is provided on the front surface of the insertion portion into the zero. In addition, the presser foot 2 is made to approach the blade groove 10 in the longitudinal direction and move forward and backward at right angles to the blade groove. This foot 2
Has a clamp surface 2a at its front against the wedge surface 1a, a wedge angle for press-fitting is provided on the clamp surface 2a, and the back surface is parallel to the axis of the W screw 3.

The W screw 3 has one end screwed into the presser foot 2 and the other end opposite to the one end screwed into a screw hole provided in the cutter body.

The blade groove 10 is formed in a rectangular cylindrical shape so that the cutting blade chip 1 having a corresponding shape is fitted and fitted. By doing so, the cutting blade tip can be prevented from moving outward and protruding by the cutter body due to centrifugal force due to centrifugal force. Therefore, even if the presser foot 2 is slightly shifted by centrifugal force, No displacement of 1 occurs. Further, since the friction with the chip is maintained, the presser foot 2 is not easily loosened. Further, the cutting edge 1
The non-circular fit ensures a stable rotation of the cutting edge tip.

As shown in the figure, a slit 12 is provided on the outer periphery of the cutter body 9 so that the thin portion 13 outside the blade groove 10 can be elastically deformed. When the clamp is held, even if the cutter 2 is turned downward and the presser foot 2 is loosened, spontaneous dropping of the cutting blade tip 1 does not occur, which is convenient.

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

The adjustment piece 5 is for regulating 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.
Is in contact with The other side is 5-10 ° to the propulsion direction
The adjustment piece 7 is brought into contact as a wedge surface 5a having a slight angle. One end of the W screw 6 is an adjustment piece 5
The other end of the reverse screw is screwed into a screw hole provided in the cutter body.

The adjustment piece 7 is detachably attached to the cutting edge chip 1 by the magnetic force of the bar magnet 8. The adjustment piece is provided to widen the adjustment range of the blade runout. That is, among known adjusting mechanisms of this kind, there is a mechanism in which a cutting blade tip is directly brought into contact with a wedge surface of a piece similar to the adjusting piece shown in the figure, and the position of the wedge surface is changed by moving the piece to adjust the position of the cutting edge. However, in this mechanism, since the adjustment accuracy is affected by the wedge angle of the wedge surface of the piece, when high-precision adjustment is required, the wedge angle of the wedge surface must be loosened. However, if the wedge angle is loosened, the adjustment range becomes narrow, and sufficient adjustment cannot be performed.

On the other hand, the adjusting piece 7 can be replaced with one having a different length, and by this replacement, the length of the plurality of cutting blade tips 1 provided on the same cutter can be adjusted by the adjusting piece 5. Even if it exceeds, it is possible to perform the macro adjustment by the adjustment piece 7 and the micro adjustment by the adjustment piece 5 to accurately align the cutting edge positions of the respective chips.

The macro adjustment can be externally preset. If this macro adjustment is performed, the adjustment piece 5
, The amount of adjustment is insignificant, so that even if the adjustment range is widened, the adjustment time can be shorter than before.

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

[0022]

[0023]

FIGS. 5 to 7 show a second embodiment of the present invention. This clamping mechanism differs from the first embodiment in that the cutting 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, even if the blade groove 10 and the cutting edge chip 1 are circularly fitted, the effect obtained is not significantly changed. In this structure, since the rotation of the cutting edge tip 1 is performed by the presser foot 2, the load of the presser foot is increased a little, but the processing of the blade groove is easier than that of the square blade groove.

Further, since the blade groove 10 is not open to the outer periphery of the cutter body, the blade groove is not pushed open by the press-fitting of the presser foot, and the distortion and deformation of the main body are reduced. In this regard, the same effect can be obtained in the first embodiment except that the slit 12 is omitted.

[0027]

As described above, according to the present invention, the blade groove is formed into a square groove or a round groove, and a cutting blade chip having a shape and a size corresponding to the groove is formed on the front surface of the cutter body. And clamps with a presser foot that moves back and forth at right angles to the blade groove.
And a highly practical clamping mechanism can be realized. Also on
With the clamp structure described above, the movement of the cutting edge tip in the radial direction of the cutter is constrained by the cutter body, the stability of the clamp does not decrease even at high speed rotation, and shifting and popping out due to centrifugal force of the tip are reliably prevented. Processing stability and processing accuracy are improved.

Further, since the blade runout adjusting mechanism having a replaceable adjustment piece is provided , the blade runout adjustment becomes easier than before and the adjustment range is widened.

[Brief description of the 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 longitudinal sectional view of the same clamping mechanism.

FIG. 3 is a cross-sectional view showing details of a blade runout adjusting mechanism.

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

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

FIG. 6 is a longitudinal sectional view of the above.

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 that takes measures against centrifugal force.

[Explanation of symbols]

 Reference Signs List 1 cutting edge tip 1a wedge surface 2 presser foot 2a clamping surface 3 W screw 4 blade runout adjustment 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-in groove 12 slit 13 Thin part

Claims (3)

(57) [Claims] 1. A tip clamping mechanism for a front milling cutter, wherein a cutting edge tip is inserted into a blade groove provided at a predetermined position on an outer periphery of a cutter body and is removably clamped with a presser pressed into the cutter body. The blade groove is a cylindrical groove in the cutter axial direction that opens to the front surface 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. the wedge surface which is pressurized with the presser foot to the outer periphery of the insertion portion with the insertion portion of the blade groove to the size and cross-sectional shape to correspond to the blade groove is provided, and further conditions
Move the piece back and forth at right angles to the blade groove with a screw and set it on the adjustment piece.
Displace the wedge surface in the cutter axis direction, and
The cutting edge position of the cutting edge tip with reference to the position of the cutting edge
A blade runout adjusting mechanism is provided at the inner end of the blade groove.
The adjustment mechanism is detachably held by the
With an adjustment piece interposed between the alignment piece and the cutting tip
A tip clamping mechanism for a front milling cutter. 2. A tip clamping mechanism for a front milling cutter according to claim 1, wherein said blade groove is formed in a cylindrical shape. 3. A tip clamping mechanism for a front milling cutter according to claim 1, wherein said blade groove is formed in a rectangular cylindrical shape.