JPH09155622A - Milling cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate regulation of the height of a milling cutter and to increase the holding force of a tip, in a milling cutter using a button type throw- away tip. SOLUTION: A square fit-in recessed part 8 is formed in a cutter body 1 and a containing hole 9 is formed in the bottom of the fit-in recessed part 8, and a rest button 10 is formed therein. The boss part in the shape of a square is fitted in the fit-in recessed part 8. A clamp screw 13 is inserted in a mounting hole 7 formed in the central part of the tip 2 and the mounting hole 12 of the rest button 10 and a tip is thread-mounted on the cutter body 1 to simultaneously combine together the two members 2 and 10. Further, the rest button 10 is fixed by a screw member 15 screwed in from the side of the cutter body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling cutter for plane cutting, etc., to which a circular piece type throw-away tip is attached.

[0002]

2. Description of the Related Art Conventionally, the insert of a throw-away type cutting tool is made into a circular shape, and when the insert is worn or chipping occurs, the corner is changed and the direction is changed to a round piece type which effectively uses the entire circumference blade. A throw-away tip is known. At this time, a technique such as, for example, Japanese Utility Model Laid-Open No. 5-93702 is known in order to appropriately and promptly change the corner of the round piece type throw-away tip.
In this technology, the shape of the mounting hole of the tip to the cutter body is made polygonal, the corners are changed while aligning each side of the polygon with the fixing surface of the cutter body, and it is fixed with the lever lock provided on the cutter body. ing.

[0003]

However, in the above-mentioned technique, since the tip is fixed to lock the tip, there is a problem in the tip holding force, and it is necessary to operate the lever lock screw to perform the tightening by the lever lock. Therefore, for example, when adjusting the milling height,
Both the tightening screw for fixing the height adjusting member and the lever lock screw for fixing the tip have to be operated, which causes a problem of poor work efficiency. Therefore, there has been a demand for a milling tool that can fix the tip with a strong holding force, and can easily adjust the milling height, change the corner of the tip, and replace the tip.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a milling cutter in which a boss portion of a circular piece type throw-away tip is fitted and fixed in a fitting recess of a cutter body. The fitting recess of the main body and the boss of the circular piece type throw-away tip are each made into a polygonal shape, and a housing hole for housing a height adjusting rest member is provided in the bottom of the fitting recess of the cutter body. When the rest member was housed in the hole, the front surface of the rest member was made to be the seating surface of the round piece type throw-away tip, and mounting holes were provided in the center portions of the rest member and the round piece type throw-away tip, respectively. Then, a single fastening member is inserted into these mounting holes so that they can be simultaneously coupled to the cutter body.

As described above, by fitting and fixing the fitting recess of the cutter body and the boss of the circular piece type throw-away tip in a polygonal shape, the corner change is appropriate and easy, and the milling height is improved. When adjusting
It is only necessary to operate a single fastening member.

According to the second aspect of the present invention, the rest member is fixed in the accommodation hole by a screw member screwed from the side surface of the cutter body. Although this rest member is coupled to the cutter body by the fastening member, it can be more firmly fixed with this screw member, which contributes to the stability of the posture of the chip and is also effective in preventing loosening of the fastening member. There is.

[0007]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a front view of the milling cutter of the present invention viewed from the front direction, and FIG. 2 is A of FIG.
2 is a cross-sectional view taken along the line A, FIG. 3 is a view taken in the direction of arrow B in FIG. 2, FIG. 4 is a front view of the circular piece throwaway tip seen from the front side, and FIG. 5 is a perspective view thereof. The milling cutter of the present invention is configured as, for example, a front milling cutter used for cutting a plane perpendicular to the milling axis, and as shown in FIGS. 1 and 2, a cutter body 1 that rotates around a central axis O, and this cutter. A plurality (in the embodiment, 1 is attached to the front peripheral portion of the main body 1)
(2 pieces) round piece type throw-away tip 2, ...

As shown in FIGS. 4 and 5, the circular piece type throw-away tip 2 has a cutting edge 3 on the front circumferential portion, and a side surface continuous with the cutting edge 3 serves as a rake face 4.
In addition, inner portions connected to the cutting edge 3 are respectively configured as flanks 5, and a rectangular boss portion 6 having chamfered corners is provided on the rear surface side of the tip 2 so as to project. A mounting hole 7 is provided at the center of the chip 2 so as to penetrate from the front surface side to the rear surface side, and the front surface side of the mounting hole 7 is configured as a tapered hole 7a whose diameter gradually increases toward the outside. ing.

On the other hand, in the vicinity of the peripheral edge of the cutter body 1, there are formed rectangular fitting recesses 8, ... For mounting the above-mentioned chips 2 ,. The sizes of the boss portions 6 are substantially the same so that they can be fitted freely. The shapes of the boss 6 and the fitting recess 8 may be a triangle other than a quadrangle, or a polygon such as a hexagon.

Further, in the bottom of each of the fitting recesses 8 ...
The rest button 10 as a rest member for adjusting the height of the milling cutter can be accommodated therein. As shown in FIG. 3, the bottom surface 9a of the accommodation hole 9 is provided with an inclination θ that decreases from the downstream side toward the upstream side of the cutting rotation in the circumferential direction. When the rear surface side of the rest button 10 is housed in close contact, and then the end surface of the boss portion 6 of the chip 2 is mounted in close contact with the front surface of the rest button 10, the cutting edge 3 on the front surface of the chip 2 is inclined by an angle θ. ing. By the way, this θ is about 5 degrees.

Further, on the front surface of the cutter body 1, the chip discharge concave portion 1 is provided downstream of the fitting concave portion 8 in the cutting rotation direction.
.. are formed, and the chip discharge concave portion 11 communicates with the fitting concave portion 8 and is a deep hole concave portion 11a in which the inner side in the radial direction is deeply carved, and the outer side in the radial direction reaching the peripheral end surface. Is a shallow hole recess 11b that is shallowly carved.

The rest button 10 is for adjusting the height of the milling cutter, and has a mounting hole 12 at the center thereof. Then, when the chip 2 is accommodated in the accommodating hole 9, the front surface is made to be the seating surface of the chip 2, and the mounting hole 12 of the rest button 10 and the chip 2 are mounted with the chip 2 placed and positioned on the seating surface. The holes 7 are arranged in a straight line.

The rest button 10 and the tip 2 as described above
Is connected to the cutter body 1 with a single clamp screw 13. That is, this clamp screw 13
Are mounting holes 7, 1 for the tip 2 and the rest button 10, respectively.
2 includes a shaft portion that can be inserted into the shaft 2, and a screw portion formed at the tip of the shaft portion. The screw portion can be screwed into a screw hole formed from the bottom surface of the accommodation hole 9 of the cutter body 1 toward the rear side. And the tapered portion 13a of the head is attached to the mounting hole 7 of the chip 2.
The taper hole 7a is engaged.

In order to securely fix the rest button 10 housed in the housing hole 9, a screw hole 14 is formed from the side surface of the cutter body 1 toward the housing hole 9. Then, the screw member 15 is screwed into the screw hole 14, and the peripheral side portion of the rest button 10 is pressed and fixed at the tip of the screw member 15.

The operation of the milling cutter as described above will be described. The rest button 10 of a predetermined standard is accommodated in the accommodation hole 9 of the cutter body 1, and the boss portion 6 of the chip 2 is inserted from above.
After fitting into the fitting recess 8, the clamp screw 13 is screwed into the cutter body 1 through the mounting holes 7 and 12.
At this time, a hexagonal recess c (FIG. 2) is formed at the head of the clamp screw 13, and a hexagonal bar wrench is inserted and screwed into the hexagonal recess c. In addition, the clamp screw 13 in the coupled state
The end surface of the head does not protrude from the front surface of the chip 2.

When the tip 2 and the rest button 10 are coupled in this way, the side screw member 15 is tightened to firmly fix the rest button 10. Then, when the front surface of the tip 2 of the cutter body 1 is brought into contact with the workpiece and the workpiece is machine-fed while the cutter body 1 is rotated around the central axis O to perform surface grinding, the position of the rest button 10 is changed. Since it is firmly fixed, the attitude of the tip is more stable and machining accuracy is improved. Then, the cutting chips are discharged through the chip discharge recess 11.

In the milling process as described above, when adjusting the milling height, after loosening the screw member 15, the clamp screw 13 is removed and the rest button 10 is replaced.
Further, when the chip 2 is worn or chipped to change the corner of the chip 2, the clamp screw 13 is loosened to change the direction of the chip 2, and the boss portion 6 is fitted into the fitting recess 8 in a new direction. Then, the clamp screw 13 is tightened again. All of these operations are simpler than conventional ones, and work efficiency is good.

[0018]

As described above, according to the milling cutter of the present invention, the rest member and the circular piece type throw-away tip can be joined to the cutter body by a single fastening member. When adjusting the height, very simple operation is required, and the corner change of the round piece type throw-away tip can be easily performed. Further, since the rest member is fixed by the screw member, there is an effect that the posture of the tip is stable and the fastening member is hard to loosen.

[Brief description of the drawings]

FIG. 1 is a front view of a milling cutter of the present invention viewed from the front.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a view taken in the direction of arrow B in FIG. 2;

FIG. 4 is a front view of a circular piece type throw-away tip as seen from the front side.

FIG. 5 is a perspective view of a circular piece type throw-away tip.

[Explanation of symbols]

1 ... Cutter body, 2 ... Round piece type throw-away tip, 6
... Boss part, 7 ... fitting concave part, 9 ... accommodating hole, 10 ... rest button, 12 ... mounting hole, 13 ... clamp screw, 15 ... screw member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisato Tokunaga 1500 Hirakawa, Otsu-cho, Kikuchi-gun, Kumamoto Prefecture Kumamoto Manufacturing Co., Ltd. (72) Fumio Utsumi 2-1-1 Kamihigashi, Hirano-ku, Osaka No. 18 Daiji Industrial Co., Ltd.

Claims (2)

[Claims] 1. A milling cutter in which a boss portion of a round piece type throw-away tip is fitted and fixed to a fitting concave portion of a cutter body, wherein the fitting concave portion of the cutter body and the round piece type throw-away tip. Each of the bosses has a polygonal shape, and an accommodation hole for accommodating a height-adjusting rest member is provided in the bottom of the fitting recess of the cutter body, and when the accommodation member is accommodated in the accommodation hole, the front surface thereof is Each mounting so that it becomes the seating surface of the round piece type throw-away tip, and a single fastening member is inserted through the rest member and the central portion of the round piece type throw-away tip so that they can be simultaneously coupled to the cutter body. Milling cutter with holes formed. 2. The milling cutter according to claim 1, wherein the rest member is fixed in the accommodation hole by a screw member screwed from a side surface of the cutter body.