JP3264019B2 - Indexable turning tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the structure of a throw-away type turning tool capable of improving the life of a cutting edge.

[0002]

2. Description of the Related Art FIGS. 7 to 9 show an example of a conventional throw-away type turning tool of this type. In the throw-away type turning tool shown in these figures, a throw-away tip 8 is mounted and fixed via a sheet member 6 to a tip seat 4 formed at the tip of the tool body 2.
An L-shaped lever member 12 is provided inside the tool body 2.
Is disposed with one end thereof being inserted into the mounting hole 9 of the throw-away tip 8 and the other end thereof being positioned below the clamp screw 10.
Is tightened to fix the throw-away tip 8 to the tip seat 4 via the lever member 12.

[0003] When cutting a work material using the conventional throw-away type turning tool as described above, there is a problem that the temperature near the tip 8a of the throw-away tip 8 becomes extremely high and the life of the tip is shortened. there were. In such a case, it is difficult to sufficiently supply the coolant with the method of supplying the coolant from the cooling nozzle provided separately from the tool to the throw-away tip 8 and to effectively cool the throw-away tip 8. It was difficult to do.

The present invention has been made in view of the above circumstances, and provides a throw-away type turning tool capable of effectively cooling a throw-away insert and improving the life of the cutting edge and the machining accuracy. It is an object.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a throw-away type turning tool in which a throw-away tip is detachably attached to a tip end of a tool body, wherein a seat member is provided on a tip seat on which the throw-away tip is seated. Through
Then, the throw-away tip is attached, and the seat portion is
A coolant supply channel capable of cooling a lower surface of the throw-away tip in a mounted state is formed on an upper surface of the material .

[0006]

According to the throw-away type turning tool according to the above configuration, at the time of cutting, the throw-away chip is cooled from the lower surface by the cooling liquid passing through the cooling liquid supply flow path, and the temperature rise is suppressed, The service life of the cutting edge is extended, and the processing accuracy of the work material is improved. The coolant supply flow path is not a throw-away tip, but a sheet member interposed in a tip seat to which the throw-away tip is attached.
Since it is formed on the upper surface of the chip, it is possible to cope with different chip shapes.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The indexable insert of the indexable turning tool according to the present embodiment (hereinafter referred to as “insert”).
Is basically the same as the above-mentioned conventional throw-away type turning tool.
A lever member 16 having a character shape is provided, and the tip 24 mounted on the tip seat 20 via the sheet member 22 is fixed by tightening the clamp screw 18.

However, in the throw-away type turning tool according to the present embodiment, the structure of the sheet member 22 is different from the above-described sheet member 6 in the conventional throw-away type turning tool as follows. The conventional sheet member 6 is a mere flat plate. On the other hand, as shown in FIGS. 4 to 6, the sheet member 22 according to the present embodiment has a groove 26 formed on the upper surface thereof. The groove 26 is formed in a rhombic shape along the contour of the sheet member 22, and has a substantially U-shaped cross section as shown in FIG. Further, a supply-side cutout portion 28 and a discharge-side cutout portion 30 are formed at two opposing locations of the groove portion 26, respectively. These notches 28, 3
Reference numeral 0 denotes an outer wall portion 26a of the groove portion 26 which is cut out in an arc shape. A through hole 32 for inserting the lever member 16 is formed in the center of the sheet member 22.
Further, the chip 24 according to the present embodiment has a shape in which the peripheral portion 24a is depressed as shown in FIG. 6, but may be a flat chip.

On the other hand, a coolant supply port 34 connected to a coolant supply unit (not shown) is formed in the tool body 14, and a flow path 36 extending upward from the coolant supply port 34; Tip seat 2 from the upper end of
0 and a flow channel 38 extending in parallel. Channel 3
8 is formed so as to communicate with the notch 28 of the sheet member 22 placed on the chip seat 20. The channels 36 and 38 form a coolant supply channel.

In the throw-away type turning tool according to the above configuration, a work material (not shown) is rotated around an axis while a coolant such as water is supplied from a coolant supply unit (not shown) to rotate the tool body 14. The tip 2 provided at the tip of the tool body 14 while feeding in the feed direction (the direction of arrow A in FIG. 1).
The cutting of the work material is performed at the tip portion 24a of No. 4. At this time, the coolant supplied from the coolant supply port 34 is
Through the flow paths 36 and 38, the air is guided from the notch 28 into a space defined by the groove 26 of the sheet member 22 and the lower surface of the chip 24. Then, the fluid passes through the groove 26 while being diverted to the left and right routes (the routes B and C in FIG. 1), and is received from the coolant discharge port 30a (FIG. It is discharged toward the cutting material side.

When the coolant passes over the groove 26, the lower surface of the chip 24 is sufficiently in contact with the coolant and is cooled well from the outer periphery. For this reason, the chip 24 is always cooled from the lower surface during cutting, and the temperature rise is suppressed.
As compared with the case where the lower surface is not cooled, the life of the cutting edge is extended and the machining accuracy is improved.

The position and shape of the coolant discharge port 30a can be variously set, for example, by forming the cutout portion 30 at an angle to the normal direction of the outer wall portion 26a.
A cooling liquid may be sprayed from the lower surface of the chip to the work material side to cool the work material. Also, by preparing a plurality of types of sheet members corresponding to different chip shapes, it is possible to cope with a change in the chip shape without changing the tool body 14.

In the above embodiment, two notches are formed in the groove 26. However, three or more notches may be formed, such as two or more notches on the discharge side. Good.

[0014]

As described above, in the throw-away type turning tool according to the present invention, the throw-away insert is seated on the insert seat through the seat member.
The away chip is attached, and the upper surface of this sheet member
Since the coolant supply flow path that can cool the lower surface of the insertable insert in the mounted state is formed, the insertable insert is cooled from the lower surface side, the temperature rise of the insert during cutting is suppressed, and the life of the cutting edge is reduced. And at the same time, the processing accuracy of the work material can be improved. Also, by setting the position and shape of the opening on the discharge side of the coolant supply flow path in various states, the coolant is sprayed from the lower surface of the chip to the work material side to be used for cooling the work material. Can also. In addition, since the coolant supply channel is formed not on the throw-away tip but on the upper surface of the sheet member ,
It is also possible to cope with a change in the tip shape.

[Brief description of the drawings]

FIG. 1 is a plan view of a throw-away type turning tool according to an embodiment of the present invention.

FIG. 2 is a view seen from an arrow II in FIG. 1;

FIG. 3 is a view as seen from the direction of arrow III in FIG. 1;

FIG. 4 is a partially enlarged perspective view of the indexable turning tool of FIG.

FIG. 5 is a plan view of a sheet member.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a plan view showing an example of a conventional indexable turning tool.

FIG. 8 is a side view of the turning tool of FIG. 7;

FIG. 9 is a front view of the turning tool of FIG. 7;

[Explanation of symbols]

 14 Tool body 20 Tip seat 22 Seat member 24 Tip 26 Groove part 28, 30 Notch part 36, 38 Channel

Claims (1)

(57) [Claims] 1. A throw-away type turning tool having a throw-away insert detachably attached to a tip end portion of a tool body, wherein the insert seat on which the throw-away insert is seated is provided with a throw-away chip via a sheet member.
A throw-away type turning tool, wherein a cooling liquid supply flow path capable of cooling a lower surface of the throw-away tip in a mounted state is formed on an upper surface of the sheet member .