JP3260234B2 - Indexable inserts and rotary tools for rotary tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutting insert for a rotary tool, which cuts a cutting body while rotating following a workpiece, and a rotary cutting tool having the rotary cutting tip for the rotary cutting tool.

[0002]

2. Description of the Related Art Conventionally, in a turning and boring system, there is a cutting tool used for inner and outer diameter machining of a workpiece. FIGS. 6 and 7 show examples of this type of tool.
There is a cutting tool to which a disc-shaped indexable insert is attached as shown in FIG. In this cutting tool, for example, a chip seat 2 having a concave portion having a substantially rectangular shape in a plan view is formed at a tip end of a tool body 1, and a disc-shaped throw-away tip 4 is seated on a tip seat bottom surface 3. Reference numeral 4 is fixed by a lever 5 formed in an L-shape. The lever 5 has one end 6 inserted into a through hole 7 provided in the center of the throw-away tip 4 and the other end 8.
Is projected into a screw hole 9 drilled at the tip of the tool body 1, and the screw 10 is screwed toward the back of the screw hole 9, whereby the entire body rotates around the corner 11 as a fulcrum. The one end 6 strongly presses and holds the throw-away tip 4 against the tip seat side wall surface 12.
A locking claw 13 is provided at one end 6 of the lever 5, and the locking claw 13 is locked to a locking flange 14 provided in the through hole 7 of the throw-away tip 4, and The away tip 4 is strongly pulled in the direction of the tip seat bottom surface 3 of the tool body 1 and is restrained. When the workpiece is cut, the cutting is performed by the cutting edge of the disc-shaped throw-away tip 4 fixed and held as described above. If the cutting edge is worn or the cutting edge is broken, the lever is cut. 5, the cutting force is reduced by loosening the binding force of the indexable insert 4 by changing the mounting angle position of the indexable insert 4.

[0003]

When the cutting portion of the indexable insert 4 is worn, the cutting operation is stopped and the indexable insert 4 is removed.
It is necessary to release the clamp and to re-clamp after rotating the throw-away tip 4 by hand, and there is a problem that continuous cutting cannot be performed. Further, since the indexable insert 4 is partially worn, there is a problem that the wear speed is high and the continuous cutting time is short.

The present invention has been made in view of the above problems, and provides a throw-away tip for a rotary bite which is easy to manufacture, has low cost, and can easily obtain coaxiality of the chip, and a rotary bite using the same. With the goal.

[0005]

According to a first aspect of the present invention, there is provided a throw-away insert for a rotary tool, wherein the insert is formed in a disk shape and a ridge line of at least one of a peripheral surface and upper and lower surfaces is a cutting edge. In a throw-away tip for a rotary bite, which makes the cutting edge abut on a rotating object to be cut and cuts the object while rotating following the object to be cut, the contour in plan view is circular. The two surfaces facing each other are parallel to each other, and a disk-shaped chip main body having a through hole formed so as to pass on the center axis thereof, and an end portion of the chip main body is formed in the through hole of the chip main body. A shaft body press-fitted and fixed so as to protrude from the upper and lower surfaces, respectively, and the shaft body has an outer diameter corresponding to the through hole.
The cylindrical large-diameter part formed in external view and the axial direction of this large-diameter part
Projected from both ends, its own axis is the same as the axis of the large diameter part
It consists of a cylindrical small-diameter part located on the axis
So that only this small diameter portion protrudes from the upper and lower surfaces.
The tool formed at the tip of the tool body of the rotary tool.
And placed on the bottom of this chip seat.
Having a flange portion that fits into a recess formed on the bottom surface of the chip seat.
Lower shaft hole formed in the center of the flange surface of the seat
And the indexable launcher placed on the tip seat
On the underside of the clamp breaker that extends into the area of the top of the
In a shaft hole after having been made, the small diameter portion of the shaft body by Rukoto is fitted rotatably, around the shaft body, characterized in that mounted rotatably on the tool body.

[0006]

[0007] Rotary-byte second aspect, the throw-away tip for rotary byte of claim 1 wherein, Ri Na and a said machining <br/> tool body the indexable insert is mounted, the slow Away tip ahead
Attached to the tool body so that it can rotate around the shaft
It has been kicked and said Rukoto.

[0008]

[0009]

In the indexable insert for a rotary tool according to the first aspect of the present invention, the indexable insert for a rotary tool is used while its shaft is rotatably held.

Further, in this claim 1, wherein the throwaway insert for a rotary bytes, the shaft portion of the indexable insert for a rotary bytes protrudes on the upper and lower surfaces, the protruding portion of the shaft portion is rotated retained.

In the rotary tool according to the second aspect of the present invention, the shaft portion of the indexable insert for a rotary tool is rotatably supported by the tool body.

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. First, a throw-away tip for a rotary tool (hereinafter, simply referred to as a "throw-away tip") of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 20 denotes a throw-away chip of the present invention. This throw away tip 20
Two surfaces 20a and 20 whose circular outlines in plan view face each other
b are parallel to each other, and a disk-shaped chip body 22 having a through hole 21 formed so as to pass on the center axis thereof, and an end of the chip body 22 in the through hole 21 of the chip body 22 And a shaft 23 which is press-fitted and fixed so as to protrude from at least one of the upper and lower surfaces 20a and 20b.

The shaft body 23 has a cylindrical large-diameter portion 24 having an outer diameter coinciding with the through-hole 21 and protrudes from both ends in the axial direction of the large-diameter portion 24 and has its own axis. Is constituted by a cylindrical small-diameter portion 25 which is located on the same axis as the large-diameter portion 24 and which is in a columnar view when viewed from the outside. The axial body 23 has a dimension in the axial direction of the large-diameter portion 24,
0, so that when pressed into the through-hole 21, the axial both end surfaces 26, 26 of the large diameter portion 24 are respectively upper and lower surfaces 20 a,
20b, and only the small diameter portions 25, 25
a, 20b. The upper and lower surfaces 20a and 20b of the chip body 22 and the chip body 2
Each ridge line with the outer peripheral surface 20c of the second forms a cutting edge 27.

Hereinafter, the rotary cutting tool 30 which holds the throw-away tip 20 will be described. FIG.
As shown in FIG. 2, the rotary cutting tool 30 includes the throw-away tip 20 and a tool body 31 to which the throw-away tip 20 is attached, and the throw-away tip 20 is centered on a center axis of the tip body 22. It is rotatably attached to the tool body 31. The tool body 31 has a notch 34 formed by notching a tip surface 33 of a projection 32 formed at a tip, and a corner of the notch 34 is further cut into a substantially fan shape in a plan view. A tip seat 35 on which the throw-away tip 20 is placed is formed.

As shown in FIG. 3, a concave portion 36 having a circular cross section is formed in the bottom surface of the tip seat 35. The concave portion 36 has a substantially cylindrical shape having a flange portion 37 having substantially the same diameter as the throw-away tip 20. The seat portion 38 is fitted and the flange portion 37 is seated on the bottom surface of the chip seat 35. The seat part 3
8, a lower shaft hole 39 is formed in the center of the surface of the flange portion 37. The shaft 2 of the throw-away tip 20 is formed in the lower shaft hole 39.
3 is rotatably fitted, whereby the throw-away tip 20 is seated on the flange 37.

A clamp breaker 40 is fitted into the notch 34 on the tip surface 33 and is fixed by a clamp screw 41. A part of the clamp breaker 40 extends to a region of the upper surface 20a of the throw-away tip 20 placed on the tip seat 35, and an upper shaft on which the shaft 23 of the throw-away tip 20 is rotatably fitted. A pressing portion 43 having a hole 42 is formed, and the throw away tip 20 is pressed by the pressing portion 43.

A cylindrical brake collar 45 having a U-shaped cross section is provided between the clamp breaker 40 and the head 44 of the clamp screw 41. Clamp breaker 4
A hole 46 is formed in the area around the zero clamp screw 41, and the clamp screw 4 is formed in the hole 46.
An annular collar 47 having a T-shaped cross section through which 1 penetrates is provided,
Its upper end is in contact with the lower surface of the brake collar 45. A brake washer 48 is fitted on the upper surface of the clamp breaker 40 on the outer periphery of the annular collar 47, and a wave washer 49 is interposed between the brake washer 48 and the brake collar 45 in a compressed state. I have.

A cylindrical stepped concave portion 50 is formed around the clamp screw 41 in the cutout portion 34 of the projection portion 32, and a flange portion of the annular collar 47 is located in the wide portion, and a narrow portion. A coil spring 51 for pressing the flange portion of the annular collar 47 is disposed on the outer periphery of the clamp screw 41, and urges the clamp breaker 40 through the annular collar 47 in a direction away from the throw-away tip 20. . Therefore, the pressing portion 43 of the clamp breaker 40 is set based on the difference between the urging forces of the wave washer 49 and the coil spring 51. To adjust this pressure,
What is necessary is just to replace the brake washer 48 with a different thickness.

The indexable insert 20 attached to the tool body 31 is rotated by the rotation of the workpiece W at a position where the workpiece W is to be cut, and a desired cutting resistance is obtained. It is inclined at an appropriate angle.
(See FIG. 4). When the side rake angle α is less than −6 degrees, the rotational force for following rotation with respect to the rotation of the workpiece W is insufficient, and the side rake angle α is −40 degrees. Exceeding the degree increases the cutting resistance of the workpiece W, which hinders the cutting. Therefore, it is necessary to set the angle within this range.

Since the present embodiment is configured as described above, a steel workpiece W as shown in FIG. 5 is turned at a high speed using the rotary tool according to the present embodiment. Then
Since the lateral rake angle is set to be negative, the throw-away tip 20 is driven to rotate by the cutting resistance of the workpiece W, and the entire circumference of the throw-away tip 20 is substantially reduced during the cutting of the workpiece W. Workpiece material W evenly
, And the abrasion progresses evenly over the entire circumference. As a result, the continuous processing time is extended.

Here, when the rotation axis of the throw-away tip 20 is set to the center axis of the tip body 22, it is necessary to manufacture the tip body 22 so that the coaxiality between the center axis of the tip body 22 and the outer peripheral surface becomes high precision. Is extremely difficult, and the finished surface roughness is reduced during cutting. In this regard, according to the present embodiment, in the throw-away tip 20, the through hole 2
A high degree of coaxiality can be obtained relatively easily if high precision is obtained from the position of the hole 1 and the roundness of the outer peripheral surface of the shaft body 23. Easy).

As shown in FIG.
In the above, the upper and lower shaft holes 39 and 42 are drilled and the shaft 2
If high accuracy is obtained with the small-diameter portions 25 and the roundness of the small-diameter portion 3, high coaxiality can be obtained relatively easily. Therefore, the finished surface roughness becomes highly accurate.

Further, since the throw-away tip 20 is elastically pressed by the pressing portion 43 of the brake collar 45, the throw-away tip 20 due to cutting resistance is used.
Is suppressed so as not to become faster than necessary. The driven rotation speed of the throw-away tip 20 can be appropriately adjusted by the wave washer 49. In this case, the adjustment of the pressing force of the throw-away tip 20 by the pressing portion 43 may be performed by adjusting the tightening force of the clamp screw 41 to increase or decrease the elastic force of the wave washer 49.

The seat portion 38 is provided with the concave portion 36.
When a part of the wall surface of the lower shaft hole 39 of the seat 38 in contact with the shaft 23 is worn out due to the cutting resistance acting on the throw-away tip 20, the seat 38 in the recess 36 is formed. Is rotated to change the bearing position of the cutting resistance, whereby the accuracy of the rotation and cutting of the indexable tip 20 can be maintained.

As described above, according to the indexable insert 20 of the present embodiment, the coaxiality of the center axis of rotation with respect to the insert body 22 can be easily improved, so that turning of steel or the like is performed at a high speed. In this case as well, the indexable insert 20 is driven to rotate by the cutting resistance, thereby reducing local wear, greatly extending the continuous machining time of the insert 20, and obtaining high machining accuracy. In particular, in the case of the present embodiment, the rotation of the tip 20 is guided by being sandwiched between the sheet portion 38 and the clamp breaker 40, but the coaxiality of the small diameter portion 25 of the shaft body 23 and the large diameter portion 24 are guided.
High concentricity, the run-out of the outer peripheral surface during rotation of the outer peripheral chip 20 is reduced, and as a result, the finished surface roughness of the workpiece is reduced with the same chip fixed. Is obtained.

Further, although the diameter of the through hole 21 of the throw-away tip 20 is standardized, the diameter of the shaft 23 can be freely set to the diameter of the small diameter portion 25 with respect to the large diameter portion 24. Regardless of the diameter of the through-hole 21, the throw-away tip 20 can be pivotally supported by a pivot shaft having an ideal diameter, so that the ideal throw-away tip 20 can be easily rotated.

[0029]

[0030]

[0031]

The throw-away tip 20 does not necessarily need to be formed in a cylindrical shape as in this embodiment. For example, the peripheral side surface may be formed in a tapered shape.

[0033]

According to the indexable insert for a rotary bite according to the first aspect, a shaft having a high roundness is inserted into a high coaxial through-hole formed in the chip body. As a result, the overall roundness is improved.

Further, in the first aspect rotary byte for throw-away tip according, since the shaft portion of the indexable insert for a rotary bytes protrudes on the upper and lower surfaces of both, it is possible to reliably ensure high high concentricity .

[0035]

In the rotary tool according to the second aspect , a throwaway chip for a rotary tool having high coaxiality is provided.
The use of a loop improves the machining accuracy of cutting.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a throw-away tip for a rotary cutting tool according to the present invention.

FIG. 2 is a perspective view of a main part showing an embodiment of the rotary cutting tool according to the present invention.

FIG. 3 is a longitudinal sectional view showing the rotary tool shown in FIG. 2 and a throw-away tip mounted on the rotary tool.

FIG. 4 is a perspective view of a main part of the rotary tool according to the embodiment of the present invention and a throwaway tip mounted on the rotary tool viewed from a direction different from FIG. 2;

FIG. 5 is a perspective view showing a relationship between a rotary tool according to an embodiment, a throw-away tip mounted on the rotary tool, and a workpiece.

FIG. 6 is a plan view showing a conventional throw-away tip.

FIG. 7 is a longitudinal sectional view showing the indexable insert of FIG. 6 ;

[Explanation of symbols]

 Reference Signs List 20 throw-away tip 20a upper surface 20b lower surface 20c outer peripheral surface 21 through hole 22 tip body 23 shaft body 30 rotary tool 31 tool body W body to be cut

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Nagano 1511 Komagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works (72) Inventor Hiroyuki Takahashi 1511 Furimagi, Ishishita-cho, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works (56) References JP-A-54-291 (JP, A) JP-A-57-201104 (JP, A) JP-A 4-122406 (JP, U) (58) Investigated Field (Int.Cl. ⁷ , DB name) B23B 27/00 B23B 27/08 B23B 27/12 B23B 27/14 B23B 27/16

Claims (2)

(57) [Claims] A cutting edge formed on at least one of a peripheral surface and upper and lower surfaces of the disk, the cutting edge being brought into contact with a rotating object to be cut; In the indexable insert for a rotary bite, which cuts the object to be cut while rotating following the cutting object, two opposing surfaces having a circular contour in plan view are parallel to each other and pass on the center axis thereof. And a disc-shaped chip body having a through hole formed therein, and
Its ends and a shaft body that is press-fitted and fixed so as to protrude respectively from the upper and lower surfaces of the chip body, the shaft has an outer formed on an outer diameter that matches the through hole
From the cylindrical large-diameter part and the axial ends of this large-diameter part
Protruding so that its own axis is on the same axis as that of the large diameter part.
It is composed of a cylindrical small diameter part to be placed
Only a small diameter portion is projected from the upper and lower surfaces, and a tip seat formed at a tip of a tool body of a rotary tool.
Which is placed on the bottom of the chip seat
Which is inserted into a concave portion formed on the bottom surface of the chip seat.
A lower shaft hole formed at the center of the flange portion surface of the seat portion;
Of the indexable tip placed on the tip seat
Formed on the lower surface of the clamp breaker extending to the area of the upper surface
The small diameter portion of the shaft is rotatably fitted to the upper shaft hole.
Thus, the indexable insert for a rotary bite is rotatably attached to the tool main body around the shaft body. Wherein a throw-away tip for rotary byte of claim 1 wherein, Ri Na and a said tool body the indexable insert is mounted, the Suroau
A tip is rotated around the shaft body to the tool body.
Rotary bytes characterized that you have mounted for movement.