JPH0630331Y2 - Ball end mill blade edge fastening mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a blade end fastening mechanism of a ball end mill that mounts a tip (throwaway tip) on a tip portion of a tool body so as to be movable and adjustable.

[Conventional technology]

Conventionally, as a ball end mill, for example, as shown in FIG. 8, a pair of blades (throw-away tip) with an ultra-high pressure sintered body 2 and 3 are attached to the tip of the tool body 1 by a clamp screw 4 with the tool body 1. It is known that it is attached by a clamp piece 5 that is fixed to the clamp body 5 and a clamp screw 6 that is screwed into the tool body 1.

[Problems to be solved by the device]

However, in the above-mentioned conventional ball end mill, the blades 2 and 3 are fixed to the tool body 1 by the clamp screws 4 and 6 and the clamp piece 5, so that the cutting edge runout is prevented. Difficult to do,
There is a problem that fine adjustment cannot be performed by moving the cutting edge. This has caused a problem that the blade tips of the blades 2 and 3 must be ground after the tip spherical surface of the tool body 1 is cut, especially when the re-polishing of an ultra-high pressure tool is dealt with.

The present invention has been made in view of the above circumstances, and an object thereof is a ball capable of smoothly moving and adjusting the blade edge with respect to the tool body and easily responding to re-polishing of the blade edge. It is to provide a cutting edge fastening mechanism of an end mill.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention attaches a clamp piece to the tip of the tool body so as to be movable along the reference surface of the tool body, and fixes the clamp piece to the tool body with a clamp screw. A chip is sandwiched between the clamp piece and the tool body along the reference plane of the tool body.

[Action]

In the blade end fastening mechanism of the ball end mill of the present invention,
After moving and adjusting the clamp piece along the reference plane of the tool body, by fixing this clamp piece to the tool body with the clamp screw, the tip is held between the clamp piece and the tool body, and the tip of the tip Complete the adjustment of the position with respect to the tool body.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

1 to 5, reference numeral 10 in the drawings denotes an end mill main body. This end mill body 10
Is a generally cylindrical shape with a reduced diameter on the tip side, and its tip is formed in a substantially hemispherical shape. Chip pockets 11 and 11 each having a roughly 1/4 circumference cut away are formed at positions symmetrical to the axis of the tip portion, and the wall faces facing the rotational direction of these chip pockets 11 and 11. Has chip mounting surfaces 12 and 12, respectively. Then, the first chip 20 and the second chip 30 are mounted on these chip mounting surfaces 12, 12.

The first chip 20 is a plate-shaped one having a quadrangular upper surface 21 as a rake surface and a flat lower surface 22 as a seating surface. Between these upper and lower surfaces 21, 22, there is an arc-shaped side surface 23 that intersects the upper surface 21 at an acute angle and forms a quarter circle, and a flat surface that is continuous with this side surface 23 and extends in a tangential direction for a predetermined length. A side surface 24 and a planar side surface 25 continuous with the side surface 24 and intersecting the upper surface 21 at a right angle;
The flat side surface 26 connected to the side surface 25 and the side surface 2
6 and a flat side surface 27 that is continuous with the upper surface 21 and intersects the upper surface 21 at a right angle.

In addition, the second chip 30 is the first chip 20.
And a substantially circular arc-shaped side surface 33 that intersects the upper surface 31 at an acute angle between the upper and lower surfaces 31 and 32 that are respectively a rake surface and a seating surface, and is connected to the side surface 33 and has a predetermined length. A flat side surface 34 extending in the tangential direction and an upper surface 3
1 is formed with a pair of flat side surfaces 35 and 36 that intersect with 1 at right angles and are substantially orthogonal to each other.

The first tip 20 has its lower surface 22 abutting on the tip mounting surface 12 of the end mill body 10, and
Chip mounting groove 1 whose side surface 27 is continuous with the chip mounting surface 12
3 is attached to the end mill main body 10 in a state of being in contact with the tip reference surface 14 of No. 3. Further, the notch recess 41 at the tip of the clamp piece 40 is brought into contact with the upper surface 21 and the side surface 25 of the first tip 20, and the side surface 42 of the clamp piece 40 has the tip mounting groove 13 of the end mill body 10. It is configured to come into contact with the piece reference surface 15 which is continuous with.
The tip reference surface 14 and the piece reference surface 15 of the end mill body 10 are formed parallel to each other and along the axis of the end mill body 10. further,
A long hole 43 is formed in the clamp piece 40 in the longitudinal direction (along the axis of the end mill main body 10), and a clamp screw 50 penetrating the long hole 43 is screwed into the end mill main body 10 to form a clamp. The piece 40 and the first chip 20 are fixed.
An adjusting screw 51 is attached to the base end surface of the clamp piece 40.
Is screwed in, the head of the adjusting screw 51 is in contact with the base end side wall surface of the tip pocket 11 of the end mill body 10, and by rotating the head of the adjusting screw 51, the adjusting screw 51 is rotated. The protrusion amount from the clamp piece 40 is adjusted to adjust the positions of the clamp piece 40 and the first chip 20.

In addition, the second chip 30 is the first chip 20.
In the same manner as described above, the lower surface 32 is attached to the end mill body 10 in a state of abutting the tip mounting surface 12 of the end mill body 10 and the side surface 36 abutting the reference surface 16 connected to the tip mounting surface 12. Further, the notch recess 41 at the tip of the clamp piece 40 is brought into contact with the upper surface 31 and the side surface 35 of the second chip 30, and the clamp piece 4
The 0 side surface 42 is configured to abut the reference surface 16. Then, by the clamp screw 50 penetrating the elongated hole 43 of the clamp piece 40, the end mill body 1
The clamp piece 40 and the second tip 30 are fixed to 0, and the positions of the clamp piece 40 and the second tip 30 are adjusted by the protrusion amount of the adjusting screw 51 screwed into the base end surface of the clamp piece 40. It has become.

As a result, each of the first and second chips 20 and 30 has an upper surface 2
1, 31 are mounted on the end mill body 10 so as to form the same plane.

In the ball end mill having the cutting edge fastening mechanism configured as described above, when mounting the first tip 20 of the end mill body 10, the lower surface 22 of the first tip 20 is attached to the tip mounting surface 12 of the end mill body 10. Place and mount the first chip 20 in the chip mounting groove 13,
A clamp piece in which the side surface 27 of the first chip 20 is in contact with the chip reference surface 14 of the chip mounting groove 13 and the head of the adjusting screw 51 is in contact with the base wall surface of the chip pocket 11 of the end mill body 10. The upper surface 21 and the side surface 25 of the first chip 20 are brought into contact with the cutout recess 41 of 40,
Further, the side surface 42 of the clamp piece 40 is attached to the end mill body 1
When the clamp screw 50 is screwed into the end mill body 10 while being pressed against the piece reference surface 15 of 0,
The first tip 20 and the clamp piece 40 are firmly attached to the end mill body 10.

When the second tip 30 is attached to the end mill body 10, the second tip 3 is attached to the tip attachment surface 12 of the end mill body 10 in substantially the same manner as the case of the first tip 20.
0, the lower surface 32 is placed, the side surface 36 of the second tip 30 and the side surface 42 of the clamp piece 40 are brought into contact with the reference surface 16, and the head of the adjusting screw 51 is attached to the base of the tip pocket 11 of the end mill body 10. By screwing the clamp screw 50 into the end mill body 10 in a state where the upper surface 31 and the side surface 35 of the second tip 30 are in contact with the notch recess 41 of the clamp piece 40 that is in contact with the end wall surface,
The second tip 30 and the clamp piece 40 are firmly attached to the end mill body 10.

In this way, when the chips 20, 30 are attached to the end mill body 10, the mounting position of the clamp piece 40 in the end mill body 10 is changed by changing the protrusion amount of the adjusting screw 51 screwed into each clamp piece 40. The movement can be adjusted along the axis of 10, so that the positions of the chips 20, 30 engaged with the clamp pieces 40 can be easily and smoothly adjusted. Therefore, when re-polishing the chips 20 and 30, each chip 2
By protruding 0 and 30 to the tip side of the end mill body 10, it is possible to easily grind the blade portions of the tips 20 and 30 without cutting the tip portion of the end mill body 10. Even if such re-polishing is performed, the chips 20 and 30 can be attached to the end mill main body 10 at fixed positions, the attachment reproducibility is good, and the entire length of the ball end mill can be kept constant. Further, it can be easily replaced with a conventional ball end mill, and is extremely versatile.

6 and 7 show another embodiment of the present invention. In this embodiment, each of the first and second chips 6 is shown.
The lower surfaces 62 and 72 are respectively inclined with respect to the upper surfaces 61 and 71 of 0 and 70 by a predetermined angle (acute angle), and the side surfaces 63 and 73 serving as positioning surfaces are the lower surfaces 62 and 72.
Is formed so as to intersect with the upper surfaces 61, 71 at an acute angle. Also in this embodiment, the protrusion amount of the adjusting screw 51 screwed into the clamp piece 40 is adjusted,
The clamp piece 40 is attached to each piece reference surface 1 of the end mill body 10.
By adjusting the movement along 7, 17, the position of each chip 60, 70 can be easily adjusted.

[Effect of device]

As described above, according to the present invention, the clamp piece is attached to the tip of the tool body so as to be movable along the reference surface of the tool body, and the clamp piece is fixed to the tool body by the clamp screw. Since the insert is sandwiched between the piece and the tool body along the reference surface of the tool body, after adjusting the clamp piece by moving it along the reference surface of the tool body, this clamp piece is By fixing the tip to the tool body with the clamp screw and holding the tip between the clamp piece and the tool body, the position of the tip of the tip with respect to the tool body can be adjusted smoothly, making it easy to re-grind the tip. It has an excellent effect of being able to deal with.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention.
1 is a front view seen from the side of the first chip, FIG. 2 is a bottom view of the same, FIG. 3 is a front view seen from the side of the second chip, FIG. 4 is a bottom view of FIG. 5, and FIG. FIGS. 6, 6 and 7 show another embodiment of the present invention. FIG. 6 is a front view, FIG. 7 is a bottom view and FIG. 8 is a front view of a conventional ball end mill. 10 ... End mill body (tool body), 14 ... Tip reference surface, 15 ... Piece reference surface, 16 ... Reference surface, 17 ... Piece reference surface, 20 ... First tip, 30 ... Second Chip, 40 ... Clamp piece, 50 ... Clamp screw, 60 ... First chip, 70 ... Second chip.

Claims (1)

[Scope of utility model registration request] 1. A clamp piece is attached to a tip of a tool body so as to be movable along a reference surface of the tool body, and the clamp piece is fixed to the tool body by a clamp screw. A cutting edge fastening mechanism for a ball end mill, wherein a tip is held between the tool body and the tool body along a reference surface of the tool body.