JPH0248164Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a cutting tool, and particularly to a cutting tool that is precisely positioned and fixed to a cutting tool holder that holds the tool.

Prior Art A cutting tool with a cutting edge at the tip is often used as a cutting tool.
Generally, it is used by being removably held in a tool holder provided on a machine tool. That is, the two mutually adjacent first side surfaces, second side surfaces, and rear end of the shank, which has a substantially rectangular cross section, contact the first reference surface, the second reference surface, and the third reference surface of the tool holder, respectively. In this state, the tightening bolt screwed into the tool holder is tightened and brought into contact with the third side surface of the shank opposite to the first side surface, so that the first side surface is It is pressed and fixed to the first reference surface.

Problems to be Solved by the Invention However, in such a conventional cutting tool, since the third side surface and the first side surface, which the tightening bolt is brought into contact with, are formed approximately parallel to each other, the tightening bolt is As the shank is brought into contact with the third side surface, the shank moves on the first reference surface of the tool holder, and between the second side surface and the second reference surface and between the rear end and the third reference surface. A gap was created and the positioning accuracy of the cutting tool was sometimes impaired.

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and its gist is to solve the problems described above. With the side surface, second side surface, and rear end in contact with the first reference surface, second reference surface, and third reference surface of the tool holder, respectively, the tightening bolt screwed into the tool holder is By being tightened and brought into contact with a third side surface of the shank opposite to the first side surface, the first side surface is brought into contact with the first side surface of the shank.
In a cutting tool that is pressed and fixed against a reference surface,
an inclination where the tightening force of the tightening bolt is applied to a portion of the third side surface that is brought into contact with the tightening bolt so as to press the shank toward the second reference surface and the third reference surface; The reason lies in the fact that it has a surface.

Function and Effect of the Invention By doing this, when the tightening bolt is brought into contact with the inclined surface when attaching the tool to the tool holder, the shank of the tool will have the first side facing the first reference point of the tool holder. In addition to being pressed against the surface, the second side surface and the rear end are pressed against the second reference surface and the third reference surface, respectively, due to the action of the inclined surface. That is, the cutting tool of the present invention has its first side surface, second side surface and rear end pressed against the first reference surface, second reference surface and third reference surface of the cutting tool holder, respectively, and by these reference surfaces. It is fixed in a precisely positioned state. Therefore, the tool can be accurately positioned and fixed to the tool holder without requiring special skill and in a short time.

Incidentally, if the inclined surfaces are provided at a plurality of places spaced apart in the longitudinal direction of the shank, and the tightening bolts are fixed by coming into contact with each of the plurality of inclined surfaces, the positioning accuracy of the cutting tool can be further improved. At the same time, the tightening strength of the cutting tool against the cutting tool holder increases.

Further, a pressing member having an operating surface that is inclined corresponding to the inclination of the inclined surface and that is brought into sliding contact with the inclined surface is arranged between the pressing member and the tip of the tightening bolt around the axis of the tightening bolt. If the clamping force is applied to the inclined surface through the pressing member, the shank will be reduced compared to the case where the tip of the tightening bolt is brought into direct contact with the inclined surface. A pressing force in the direction toward the second reference surface and the third reference surface is effectively applied to the shank, and damage to the inclined surface is avoided.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIGS. 1 to 3, reference numeral 10 denotes a cutting tool holder provided on a machine tool (not shown), and is composed of a main body block 12 and a rear end plate 14 that are integrally fixed to each other. Main block 1
A rectangular groove 16 is formed substantially horizontally on the front surface of 2, and the lower inner wall surface and back surface of the groove 16 constitute a first reference surface 18 and a second reference surface 20. Further, a third reference surface 22 is formed by the inner surface of the rear end plate 14, which is disposed so as to close the opening at one end of the groove 16, that is, the right end in FIGS. 1 and 2. has been done.

On the other hand, inside the groove 16, there is a chip 24 at the tip.
A cutting tool 26 to which a tool is attached is disposed, and is held removably by tightening two tightening bolts 28 screwed into the upper part of the main body block 12. The cutting tool 26 has a concave groove 16 at its tip.
A shank 30 protrudes from the other end of the first
It is disposed within the groove 16 while being placed on the reference surface 18 . The shank 30 has a substantially square cross section, the rear side surface 32 is on the second reference plane 20, and the positioning bolt 34 protruding from the rear of the shank 30 is on the third reference plane 22. being brought into contact.

The tightening bolts 28 are provided approximately perpendicularly to the first reference plane 18 at two locations spaced apart in the longitudinal direction of the groove 16, that is, in the longitudinal direction of the cutting tool 26, and the tip portions 36 of each are provided in two locations spaced apart in the longitudinal direction of the cutting tool 26. It protrudes into the groove 16. In addition, the upper surface 3 of the shank 30
8 is provided with an inclined surface 40 with notches formed at two positions corresponding to the tightening bolts 28.
This inclined surface 40 is inclined downward from the rear end surface 32 of the shank 30 toward the front side surface 42 side, and from the rear end where the positioning bolt 34 is protruded toward the front end side where the tip 24 is attached. The tip end 36 of the tightening bolt 28 is brought into contact with this inclined surface 40 via a presser piece 44. FIG. 4 is a perspective view showing a portion of the shank 30 where the inclined surface 40 is formed.

Further, the presser piece 44 has a substantially cubic shape as shown in FIG.
The upper surface 4 is inclined corresponding to the upper surface 4.
8 is provided with an insertion hole 50 into which the tip 36 of the tightening bolt 28 is inserted. The tip portion 36 has a hemispherical shape, and the presser piece 44 can rotate relative to the axis of the tightening bolt 28. The presser piece 44 constitutes a pressing member, and its lower surface 46 constitutes an operating surface.

Here, when the tightening force of the tightening bolt 28, that is, the force in the direction toward the first reference surface 18 is applied to the inclined surface 40 formed on the upper surface 38 of the shank 30 via the presser piece 44, The slope 4
0 is from the rear side 32 of the shank 30 to the front side 42
Since the shank 30 is inclined downward toward the side and from the rear toward the front end, not only is a force applied to the shank 30 toward the first reference surface 18, but also a force is applied to the shank 30 as shown in FIG. A force F is applied toward the second reference plane 20 and the third reference plane 22 as shown in FIG. Therefore, the lower surface 52 of the shank 30 is aligned with the first reference surface 18 and the rear surface 3
2 is applied to the second reference surface 20 by component force f ₁ of the above force F,
Further, the rear end, that is, the head of the positioning bolt 34 is pressed against the third reference surface 22 by a component force f ₂ of the force F, and the cutting tool 26 is pressed against the third reference surface 22 , respectively.
It is fixed to the cutting tool holder 10 in a precisely positioned state by 20 and 22. Slope 4
The inclination angle of 0 is set so that the force F that presses the shank 30 toward the reference surfaces 20 and 22 is applied to the shank 30 in this way.

That is, in the cutting tool 26 of this embodiment, when the tightening bolt 28 is tightened, the lower surface 52, the rear surface 32, and the positioning bolt 34 are moved to the first reference surface 1 by the action of the inclined surface 40.
8. Since it is pressed by the second reference surface 20 and the third reference surface 22, it is possible to fix the tool 26 to the tool holder 10 in a precisely positioned state without requiring special skill and in a short time. It is.

Further, in this embodiment, the inclined surfaces 40 are provided at two locations spaced apart in the longitudinal direction of the shank 30,
Since the tightening bolts 28 are brought into contact with each of the two inclined surfaces 40,
This has the advantage that the positioning accuracy of the cutting tool 26 is further improved, and sufficient tightening strength of the cutting tool 26 to the cutting tool holder 10 can be obtained.

Furthermore, the tightening force of the tightening bolt 28 is applied to the inclined surface 40 via the presser piece 44, which has a lower surface 46 inclined in accordance with the inclination of the inclined surface 40. , tightening bolt 28
The shank 30 is brought into contact with the reference surfaces 20 and 2, compared to the case where the tip 36 of the shank is brought into direct contact with the inclined surface 40.
2 is effectively applied to the shank 30, and damage to the inclined surface 40 is avoided.

Note that in this embodiment, the lower surface 52 of the shank 30
The rear side surface 32 is a first side surface and a second side surface that are adjacent to each other, and the upper surface 38 is a third side surface opposite to the lower surface 52.

Hereinafter, one embodiment of the present invention has been described in detail based on the drawings, but the present invention can also be implemented in other embodiments.

For example, in the embodiment described above, the tightening force of the tightening bolt 28 is applied to the inclined surface 40 via the presser piece 44, but the tip 36 of the tightening bolt 28 has a hemispherical shape. Therefore, there is no problem even if the tip portion 36 is brought into direct contact with the inclined surface 40.

Further, in the embodiment described above, the inclined surface 40 is formed at two places on the shank 30 and is fixed with two tightening bolts 28, but the shank 30 is formed at one place or at three places.
It is also possible to provide the inclined surface 40 at more than one location and fix it with one or three or more tightening bolts 28.

Further, in the embodiment described above, the positioning bolt 34 is provided protruding from the rear of the shank 30, and the head of the positioning bolt 34 is brought into contact with the third reference surface 22, but the positioning bolt 34 may not be provided. Of course, the rear part of the shank 30 may be brought into direct contact with the third reference surface 22 instead.

Further, in the embodiment, the upper surface 38 of the shank 30
Although the sloped surface 40 is provided by forming a notch in the groove, a protrusion having the sloped surface 40 may be provided.

Although no other examples are given, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a state in which a cutting tool according to an embodiment of the present invention is fixed to a cutting tool holder.
2 is a partially cutaway front view of the cutting tool holder shown in FIG. 1. FIG. Figure 3 shows − in Figure 2.
FIG. 4 is a perspective view showing the shank portion of the tool shown in FIG. 1. FIG. FIG. 5 is a perspective view of the presser foot shown in FIG. 2. 10: Bit holder, 18: First reference surface, 2
0: Second reference plane, 22: Third reference plane, 26: Bit, 28: Tightening bolt, 30: Shank, 32:
Rear side surface (second side surface), 34: Positioning bolt (rear end), 38: Top surface (third side surface), 40: Inclined surface, 4
4: Presser piece (pressing member), 46: Lower surface (action surface),
52: Bottom surface (first side surface).

Claims (1)

[Claims for Utility Model Registration] (1) Two mutually adjacent first and second side surfaces and rear end of the shank, which has a substantially rectangular cross section, are the first reference plane and second reference plane of the tool holder. and a third reference surface, the tightening bolt threaded onto the tool holder is tightened and brought into contact with a third side face opposite to the first side face of the shank. In a cutting tool in which the first side surface is pressed and fixed to the first reference surface, the tightening force of the tightening bolt is applied to a portion of the third side surface that is brought into contact with the tightening bolt. A cutting tool characterized in that an inclined surface is provided that acts to press the shank toward the second reference surface and the third reference surface. (2) The sloping surface is provided at a plurality of locations spaced apart in the longitudinal direction of the shank, and the tightening bolt is brought into contact with each of the slanted surfaces at the plurality of locations, Claim 1 of the Utility Model Registration Claim. Bytes listed in. (3) The inclined surface has an operating surface that is inclined corresponding to the inclination of the inclined surface and is brought into sliding contact with the inclined surface, and the tightening bolt is connected between the inclined surface and the tip of the tightening bolt. The cutting tool according to claim 1 or 2, wherein the tightening force is applied via a pressing member that is relatively rotatable about the axis of the tool.