JP2004230473A - Cutting tool for grooving and cutting off - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool for grooving and cutting off, having excellent operability and stability of a wrench in slit widening and restrained from damage and wear caused by clamping operation. <P>SOLUTION: This cutting tool for grooving and cutting off is constituted to clamp-fix a tip into a tip mounting part 6 provided at one end of a tool body 5 and having an upper face and a lower face, by forming the lower face of the tip mounting part 6 as a tip placing face 8, and forming the upper face as a pressing face 9 which is a part of an elastically deformable clamping arm 7. The rear end part of the tip mounting part 6 is provided with a slit 11 cut out further onto the inner side of the tool body 5, and a space region 12 of truncated cone shape is arranged in a lying direction at a part of the slit 11. Further, a taper screw 13 is formed on the internal wall of the truncated cone shape. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grooving and parting-off tool having a square or plate-like tool body, and more particularly to a clamp structure of a throw-away insert.
[0002]
[Prior art]
FIG. 5 shows an example of the prior art disclosed in Patent Document 1 described below. In this drawing, one end of a plate-shaped tool body 21 is provided with a slit 23 having a tip mounting portion 22 at a tip end thereof. The slit 23 has a mechanism in which the clamp arm 24 is pushed up by a wrench 26, and a wrench tip 27 having a substantially elliptical cross section is inserted into the space region 25 of the tool body 21 and rotated by about 1/4, thereby obtaining the cross section. An approximately oval wrench tip 27 widens the slit 23, and in this state, the chip can be detached.
[0003]
[Patent Document 1]
Japanese Patent Publication No. 138106 [0004]
[Problems to be solved by the invention]
However, in such a configuration, since the tool body and the tip of the wrench are locally in contact with each other, only the contact portion is easily worn out, and once worn out, the clamp arm cannot be sufficiently widened and the insert of the tip cannot be performed. In addition to the above, it is difficult to perform the tool life, and the strength of the clamp arm itself is reduced due to wear of a part of the clamp arm.
[0005]
The present invention has been made in order to solve the above-mentioned problems, and has excellent operability and stability of a wrench at the time of widening a slit, in a grooving having a square or plate-shaped tool body, and in a cutting-off tool, An object of the present invention is to provide a grooving and parting-off tool which is hardly damaged or worn by a clamping operation.
[0006]
[Means for Solving the Problems]
In order to solve the problem, the grooving and parting tool according to claim 1, wherein a lower surface of a chip mounting portion having an upper surface and a lower surface provided at one end of a tool body is a chip mounting surface, and the upper surface is By forming as a pressing surface that is a part of an elastically deformable clamp arm, in a throw-away type cutting tool in which a chip is pinched and fixed in the chip mounting portion, a rear end portion of the chip mounting portion is provided. A slit which is cut out further to the back side of the tool body is provided, a truncated cone-shaped space region is arranged in a part of the slit so as to lie down, and a tapered screw is formed on the inner wall of the truncated cone. It is characterized by having.
[0007]
According to such a configuration, a wrench tip portion having a truncated cone shape and having a tapered screw is inserted into the truncated cone-shaped space region where the tapered screw is formed to fit into the truncated cone-shaped space region. By rotating the wrench in the direction of tightening the screw, the tip of the wrench advances in the frusto-conical space region with the tapered screw of the tool body, whereby the clamp arm is gradually pushed up and slitted. Is widened, so that the elastic deformation of the clamp arm is continuously and gently performed, so that the stress concentration on the fulcrum of the clamp arm is reduced and the taper screw on the wrench side and the taper screw on the tool body side contact each other. Since the area is large, the force applied when the slit is widened is easily dispersed, and as a result, damage such as abrasion due to the clamping operation can be suppressed.
[0008]
The grooving and parting-off tool according to claim 2 is characterized in that the truncated cone-shaped space region is formed on a deep end face of the slit.
[0009]
According to such a configuration, it is possible to minimize the decrease in the clamping force due to the formation of the slit, to maintain the strength of the clamp arm, and to stably and securely restrain the chip.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0011]
1 to 3 show an embodiment of the present invention. FIG. 1 shows a wrench 1 used for a grooving and parting-off tool according to the embodiment, and FIG. 1 (a) is a side view. 1 (b) shows a front view. FIG. 2 is a side view of a main part of a grooving and parting tool according to the present invention, FIG. 3 is a top view of FIG. 2, and FIG. 4 is a schematic side view of another embodiment of the present invention in which a chip is mounted. FIG.
[0012]
In FIG. 1, a wrench 1 is composed of a round bar in which a short length 2 is bent at a right angle to a long length 3 and has an L-shaped appearance. The long length 3 is a portion serving as a handle of the wrench 1. The tip is formed in a truncated conical shape 4 with a tapered screw.
[0013]
In FIG. 2, a tip mounting portion 6 having an upper surface and a lower surface is provided at the tip of the tool body 5, and the upper surface side is formed as an elastically deformable clamp arm 7. A tip mounting surface 8 is formed on the lower surface and a pressing surface 9 is formed on the upper surface, and a wall surface serving as a stopper 10 is formed in the axial direction of the tool main body 5 in the tip opening of the tip mounting portion 6. Further, a slit 11 is formed at a far end of the tip mounting portion 6 at a further depth side of the tool body, and a truncated cone-shaped space region 12 is provided in a part of the slit 11 in a direction in which it lies. A tapered screw 13 is formed on the inner wall of the truncated cone.
[0014]
Here, in the frusto-conical space region 12 where the tapered screw 13 is formed, a wrench tip 4 having a frusto-conical shape and formed with a tapered screw is fitted to fit into the frusto-conical space region 12. By inserting and turning the wrench 1 in the screw rotation tightening direction, the wrench tip 4 advances in the frusto-conical space region 12 with the tapered screw 13 of the tool body 5 attached, thereby gradually clamping. Since the arm 7 is pushed up and the slit 11 is widened, the elastic deformation of the clamp arm 7 is continuously and gently performed, so that the stress concentration on the fulcrum of the clamp arm 7 is reduced, and the wrench side taper screw is used. Since the area in which the taper screw 13 on the tool body side is in contact with each other is large, the force applied at the time of widening the slit 11 is likely to be dispersed. It is possible to suppress the damage.
[0015]
Further, as shown in FIG. 4, since the truncated cone-shaped space region 12 is formed on the inner end surface of the slit 11, a decrease in clamping force due to the formation of the slit 11 can be minimized. Also, the strength of the clamp arm 7 can be maintained, and the chip can be stably and reliably restrained.
[0016]
As described above, a wrench having a truncated cone shape and formed with a tapered screw is fitted in the truncated cone-shaped space region 12 where the tapered screw 13 is formed to fit into the truncated cone-shaped space region 12. By inserting the tip 4 and turning the wrench 1 in the screw rotation tightening direction, the wrench tip 4 advances in the frustoconical space region 12 with the tapered screw 13 of the tool body 5 attached. Since the clamp arm 7 is gradually pushed up and the slit 11 is widened, the chip 14 is inserted until the rear end face of the chip 14 contacts the stopper 10 in this state. Then, if the wrench 1 is turned in a direction opposite to the above-described screw rotation tightening direction, the elastically deformed clamp arm 7 returns to its original position, and the tip 14 can be clamped and fixed. Here, the size of the truncated cone with the taper screw of the tool body is set so that the amount of pushing up of the clamp arm is within the elastic deformation range.
[0017]
As described above, the embodiments of the present invention have been exemplified. However, it is needless to say that the present invention is not limited to the above-described embodiments, and may be arbitrary without departing from the object of the invention.
[0018]
【The invention's effect】
As described above, the grooving and parting-off cutting tool of the present invention has a lower surface of a chip mounting portion having an upper surface and a lower surface provided at one end of a tool body as a chip mounting surface, and the upper surface is elastically deformable. The tip is formed as a pressing surface that is a part of a clamp arm, so that the tip is clamped and fixed in the tip mounting portion. A notched slit is provided, and a truncated cone-shaped space region is arranged in a part of the slit so as to lie down, and a tapered screw is formed on the inner wall of the truncated cone, so that a tapered screw is formed. Is inserted into the truncated cone-shaped space region in which the wrench is formed, and a wrench tip portion having a truncated cone shape and formed with a tapered screw is fitted to fit into the truncated cone-shaped space region. By rotating the wrench in the direction, the tip of the wrench advances in a frusto-conical space region accompanied by the tapered screw of the tool body, so that the clamp arm is gradually pushed up and the slit is widened. Since the elastic deformation of the clamp arm is performed continuously and gently, stress concentration on the fulcrum of the clamp arm is reduced, and the area where the wrench side taper screw and the tool body side taper screw contact each other is large. Since the force applied at the time of widening the slit is easily dispersed, damage such as abrasion due to the clamping operation can be suppressed as a result.
[0019]
Further, since the truncated cone-shaped space region is formed on the inner end face of the slit, a decrease in the clamping force due to the formation of the slit can be minimized, and the strength of the clamp arm is maintained, and stable and stable. Reliable chip binding can be achieved.
[Brief description of the drawings]
FIG. 1 is an example of a wrench used for a grooving and parting-off tool according to the present invention, wherein (a) is a side view and (b) is a front view.
FIG. 2 is a side view of the leading end of the grooving / parting-off cutting tool of the present invention.
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic side view showing a state where a chip is mounted in another embodiment of the present invention.
FIG. 5 is a side view of a main part of a conventional grooving and parting-off cutting tool.
[Explanation of symbols]
1: Wrench 2: Short 3: Long 4: Truncated conical wrench tip 5 with taper screw 5: Tool body 6: Tip mounting part 7: Clamp arm 8: Tip mounting surface (lower surface)
9: Pressing surface (upper surface)
10: Stopper 11: Slit 12: Truncated conical space area 13: Taper screw 14: Tip 21: Tool body 22: Tip mounting part 23: Slit 24: Clamp arm 25: Space area 26: Wrench 27: Wrench tip

Claims (2)

By forming the lower surface of a chip mounting portion having an upper surface and a lower surface provided at one end of a tool main body as a chip mounting surface, and forming the upper surface as a pressing surface which is a part of an elastically deformable clamp arm, the chip mounting is performed. In a grooving and parting-off cutting tool in which a chip is pinched and fixed in a part, a slit cut out further to the back side of the tool body is provided at a rear end of the chip mounting part, A grooving and parting-off tool, characterized in that a truncated cone-shaped space region is arranged in a part in a lying direction, and a tapered screw is formed on an inner wall of the truncated cone. The grooving and parting-off cutting tool according to claim 1, wherein the truncated cone-shaped space region is formed in a rear end surface of the slit.

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