JP2001096406A - Throwaway cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount throwaway tips on tip mounting seats with ease and precision. SOLUTION: The tip mounting seat 4 is delimited at the point of a tool body 2 by a bottom 4a for receiving an underside 11 of a throwaway tip 6, and a side wall 4b for receiving two of a plurality of mounting planes 15 formed on a side 13 of the throwaway tip 6. The bottom 4a is defined to meet a first and a second reference mounting plane 31a and 31b, which are each one face on the periphery of a projecting part 21 at the point of the tool body 2, while forming practically straight edge lines e with them. The first and second reference mounting planes 31a and 31b are oriented in the same directions as receiving faces 22b and 22a of the tip mounting seat 4 so as to position two of the mounting planes 15 of the throwaway tip 6 mounted on the tip mounting seat 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type cutting tool having a round or regular polygonal plate-shaped throw-away tip, among the indexable cutting tools used for cutting a workpiece.

[0002]

2. Description of the Related Art A throw-away type cutting tool is one in which a throw-away tip (hereinafter, simply referred to as a tip) is attached to a tip mounting seat provided on a tool body.
The chip mounting seat includes, for example, a bottom surface that receives the lower surface (seating surface) of the chip, and a side wall portion that receives a mounting plane provided on the side surface of the chip.
The mounting plane is mounted on the tool body by fixing means such as a clamp screw in a state where the mounting plane is in surface contact with the side wall. Some chips have a rotationally symmetric shape, such as a round or regular polygonal plate. Such a chip is provided with a plurality of flat surfaces for mounting on the chip mounting seat, and by changing the mounting direction on the chip mounting seat, the portion protruding from the tool body is changed, and the work (the workpiece It is possible to change the part used for the cutting of the object. When the sharpness of the cutting edge is reduced, the unused portion of the cutting edge can be projected from the tool body by changing the direction of attachment to the tip mounting seat, and the workpiece can be cut with this portion. It is.

[0003]

In such a throw-away type cutting tool, it is possible to mount the chip even if the chip mounting flat surface is slightly displaced from the side wall of the chip mounting seat without making surface contact. However, in that case, there is a problem that accurate mounting cannot be performed, and mounting accuracy of the cutting blade cannot be obtained. If the mounting accuracy of the chip is low, the processing accuracy of the work is reduced, and the fixing of the chip becomes uncertain, so that chipping or the like is likely to occur during the processing of the work.

The present invention has been made in view of such circumstances, and has as its object to provide a throw-away type cutting tool that can easily and accurately mount a throw-away tip on a tip mounting seat. .

[0005]

In order to solve the above-mentioned problems, in the indexable cutting tool according to the first aspect of the present invention, a ridge line on an upper surface facing a lower surface forming a seating surface is a cutting edge, A throw-away type cutting tool in which a throw-away insert having a plurality of mounting planes provided on a side surface is mounted on a tip mounting seat of a tool body, wherein the tip mounting seat receives a lower surface of the throw-away insert. And a side wall portion which is raised from the bottom surface and receives the mounting plane of the throw-away tip, wherein at least one of the outer surfaces of the tool main body intersecting the bottom surface of the tip mounting seat has the tip. A positioning portion corresponding to a mounting plane of the throw-away tip mounted on a mounting seat is provided.

In the throw-away type cutting tool thus configured, when the throw-away insert is mounted on the tool body, any one of the mounting planes (different from the one in contact with the side wall) is used. By aligning the mounting plane with the positioning portion of the tool body, the indexable insert can be mounted with the mounting plane easily and accurately in surface contact with the side wall of the chip mounting seat.
Also, since the positioning part is located on the outer surface of the tool body,
It can be visually confirmed whether or not the throw-away tip is correctly attached to the tip mounting seat.

According to a second aspect of the present invention, in the indexable cutting tool, the positioning portion is a mounting reference plane. In the throw-away type cutting tool configured as described above, the positioning portion to be matched with the mounting plane of the throw-away tip is formed by a plane, and the positioning of the throw-away tip is performed by matching these planes. Therefore, the mounting accuracy of the cutting edge of the indexable insert can be improved.

According to a third aspect of the present invention, there is provided a throw-away type cutting tool, wherein the tool main body is provided with a display portion for indicating a mounting position of the throw-away tip with respect to the tip mounting seat. In the throw-away type cutting tool configured as described above, the display position such as a figure or a description indicates the mounting position of the throw-away tip with respect to the tip mounting seat. Therefore, it is easy to confirm the mounting position of the throw-away tip. Can be.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the indexable cutting tool of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of a tip of a throw-away type cutting tool (hereinafter, simply referred to as a tool), FIG. 2 is a view showing a tip mounting seat (to be described later) of the tool, FIG.
FIG. 4 is a side view showing a side surface on the outer peripheral side of the tool.

As shown in FIGS. 1 and 4, the tool 1 has, for example, a pair of tip pockets 3 opposed to a tip end of a substantially cylindrical tool body 2 having a tapered shape with a rotation axis O interposed therebetween. Are formed, of these chip pockets 3,
A chip mounting seat 4 is provided on the wall surface facing the tool rotation direction on the tip side of the tool. Each of the insert mounting seats 4 is provided with a throw-away insert 6 (hereinafter, simply referred to as an insert) having the same shape and the same rotational symmetry, with a part thereof protruding from the tool main body 2 by a clamp screw 7. It is attached detachably.

Here, the chip 6 will be described first.
The tip 6 is made of, for example, a cemented carbide,
In this embodiment, as shown in FIGS. 2 and 3, a round disc-shaped insert having a substantially disk shape is used. The chip 6 has a lower surface 1 opposed to a lower surface 11 forming a seating surface thereof.
1, a substantially circular upper surface 12 is provided.
Reference numeral 3 denotes, for example, a truncated cone peripheral surface shape, and the lower surface 11 to the upper surface 1
The positive tip is inclined outwardly toward 2. The circular crossing ridge line between the upper surface 12 and the side surface 13 is the cutting edge 1.
It is set to 4. On the side surface 13, a mounting plane 15 for positioning has a chip 6 penetrating the center of the upper and lower surfaces 12 and 11.
Are provided at predetermined intervals, for example, at intervals of about 90 degrees, so as to be rotationally symmetric with respect to the central axis of the four surfaces. Here, in the present embodiment, the mounting flat surface 15 is formed to extend, for example, from the lower surface 11 to an intermediate position in the upper surface 12 direction. The chip 6 has upper and lower surfaces 12, 11 as shown in FIG.
, A through hole 16 through which the clamp screw 7 is inserted is formed. The insertion hole 16 has a straight hole 16a having the same inner diameter and an upper surface 1 from the upper end of the straight hole 16a.
The enlarged diameter portion 16b which is gradually enlarged in a tapered shape toward 2
And formed.

Next, details of the tool 1 will be described. As shown in FIG. 3, the tip mounting seats 4 are formed so as to be symmetrical with respect to the rotation axis O. Each of the tip mounting seats 4 is formed in a concave shape on the rear side in the tool rotation direction from the tip pocket 3 to rotate the tool. It has a bottom surface 4a facing the direction T side. Further, as shown in FIG. 2, there is also provided a side wall portion 4 b rising from the bottom surface 4 a and facing the tool tip side and the tool outer peripheral side. As shown in FIG. 2, the bottom surface 4a is provided so as to intersect with a part of the outer peripheral surface 2a and a part of the distal end surface 2b which form the outer surface of the tool body 2. In the present embodiment, the tool body 2
Are provided so as to intersect with the outer surfaces of the ridges 21 provided at the tips of the ridges, respectively. In addition, the intersection ridge line e between these surfaces and the bottom surface 4a has, for example, a plurality of substantially linear shapes forming a part of a regular octagon.

As shown in FIG. 2, the ridge 21 provided at the tip corner of the tool body 2 extends from the outer peripheral surface 2a to the tip surface 2b of the tool body 2 toward the outer peripheral side of the tool and the distal end side of the tool. The cross-section has a polygonal shape. The projecting ridge 21 will be described in more detail. The projecting ridge 21 is, in order from the outer peripheral surface 2a of the tool main body 2, a base outer peripheral surface 21a facing the proximal end outer peripheral side of the tool main body 2, and a tool outer peripheral side. A first attachment reference plane 31a substantially parallel to the rotation axis O, a tip outer peripheral surface 21b facing the tool tip outer periphery, a second attachment reference plane 31b facing the tool tip side, and a tool tip rotation axis side. And a surface 21c on the tip rotation axis side that intersects the tip surface 2b of the tool body 2. The surfaces 21a, 21b and 21c also have a chip shape. For example, in the case of a regular octagonal plate-like chip, the surfaces 21a, 21b, and 21c become mounting reference planes.

As shown in FIG. 2, the side surface 4b of the tip mounting seat 4 has a receiving surface for receiving a mounting flat surface 15 formed on the side surface 13 of the chip 6, facing the tool tip side and facing the rotation axis O. A receiving surface 22a that is substantially orthogonal and a receiving surface 22b that faces the outer peripheral side of the tool and that is substantially parallel to the rotation axis O are provided. Further, between the receiving surface 22a and the receiving surface 22b, there is formed a recessed portion 23 which is formed one step deeper than the receiving surfaces 22a and 22b and is in a non-contact state with the chip 6. The chip mounting seat 4 is provided with these receiving surfaces 22.
The chip 6 is fixed in a state in which any two of the mounting flat surfaces 15 are brought into surface contact with the a and 22b. By changing the mounting plane 15 received by the receiving surfaces 22a and 22b, it is possible to select a portion of the cutting blade 14 of the tip 6 that protrudes from the tool body 2 to the distal end side and the outer peripheral side. In this case, the receiving surfaces 22a, 22b
The other mounting planes 15 that do not abut against the mounting reference planes 31a and 31b can be used.

Here, the first mounting reference plane 31a formed on the ridge 21 of the tool body 2 described above is
In the vicinity, it is provided facing the outer peripheral side of the tool similarly to the receiving surface 22b. Further, the second mounting plane 31b is
Like the receiving surface 22a, it is provided facing the tool tip side. That is, the first and second attachment reference planes 31a, 31
b, when the receiving surfaces 22b and 22a respectively make contact with the respective mounting flat surfaces 15 of the chip 6, the mounting surfaces 15 of the chip 6 face the surfaces that are in surface contact with the receiving surfaces 22b and 22a. The other mounting planes 15 and 15 are continuous in the same direction. Thus, the first and second attachment reference planes 31a and 31b constitute a positioning portion serving as a reference for the attachment position of the chip 6.

As shown in FIG. 2, the tool body 2 is formed with a screw hole 33 into which the clamp screw 7 is screwed, substantially at the center of the bottom surface of the tip mounting seat 4. The screw hole 33 is
When the chip 6 is pressed and fixed to the chip mounting seat 4, the chip 6 attached to the chip mounting seat 4 is pressed so that the enlarged diameter portion 16 b of the insertion hole 16 provided in the chip 6 is pressed by the lower surface of the head. The center position of the insertion hole 16 (center axis of the chip 6) is slightly shifted toward the intermediate direction between the receiving surface 22a and the receiving surface 22b. Thereby, when the chip 6 is fixed to the chip mounting seat 4 by the clamp screw 7, the enlarged diameter portion 1 of the chip 6
6b is pressed by the lower surface of the head of the clamp screw 7 in the intermediate direction between the receiving surface 22a and the receiving surface 22b, and the chip 6 is pressed against the bottom surface 4a of the chip mounting seat 4 and the receiving surfaces 22a, 22b of the side wall 4b. It is designed to be pressed and fixed.

As shown in FIG. 4, on the outer peripheral surface 2a of the tool body 2, on the base end side of the chip mounting seat 4, a display portion 34 for explaining the mounting position of the chip 6 with respect to the chip mounting seat 4. Is engraved. The display unit 34 includes, for example, the mounting plane 15 of the chip 6, the first and second mounting reference planes 31 a of the tool body 2 to be matched with the mounting plane 15,
31b and a diagram showing a state in which these surfaces are matched with each other in the chip mounting seat 4;
And an explanatory note indicating that the second attachment reference planes 31a and 31b are attached so as to coincide with each other. Here, the display unit 34 shown in FIG.
The first and second attachment reference planes 31a and 31b, the attachment plane 15 of the chip 6, and any pattern and description as long as they indicate that the orientations of these faces are matched. Good.

Hereinafter, a method of attaching the tip 6 to the tip attachment seat 4 in the tool 1 having the above-described configuration will be described. First, referring to the display unit 34 engraved on the base end side of the outer peripheral surface 2a of the tool main body 2, the first
It is checked which of the second attachment reference planes 31a and 31b is. Then, as shown on the display unit 34, the orientation of any two of the mounting planes 15 of the chip 6 is made to match the orientation of the first and second mounting reference planes 31a and 31b, respectively (or mounting). Any one of the reference planes 15 may simply be aligned with one of the first and second attachment reference planes 31a and 31b). In this state, the chip 6 is fixed to the chip mounting seat 4 by the clamp screw 7 so that the chip 6
5 is a receiving surface 2 provided on the side wall 4b of the chip mounting seat 4.
2b and 22a are attached in surface contact.

According to the indexable cutting tool 1 configured as described above, the reference of the mounting position of the chip 6 is indicated by the first and second mounting reference planes 31a and 31b forming the positioning portion. Thus, even in the case of a round chip 6 having a number of mounting directions to the chip mounting seat, any two surfaces of the mounting planes 15 can be attached to the tool body 2 respectively.
By aligning the orientation with the first attachment reference planes 31a, 31b, or by setting any one of the attachment planes 15 to any one of the first attachment reference planes 31a, 31b of the tool body 2. By matching, chip 6
The mounting flat surface 15 can be easily and accurately brought into surface contact with the receiving surfaces 22b, 22a provided on the side wall 4b of the chip mounting seat 4 and mounted. Further, the positioning portion to be aligned with the mounting plane 15 of the chip 6 is formed by a plane, and the positioning of the chip 6 is performed by matching these planes, so that the mounting accuracy of the chip 6 can be improved. . In addition, since the first and second attachment reference planes 31a and 31b are located on the outer surface of the tool body 2, the reference for the attachment position of the chip 6 can be easily confirmed. Further, since the correct mounting position of the chip 6 with respect to the chip mounting seat 4 is indicated by the display unit 34, the mounting position of the chip 6 can be easily confirmed. In addition, whether or not the chip 6 is correctly mounted on the chip mounting seat 4 can be visually confirmed.

In the above-described embodiment, the first and second mounting reference planes 31a and 31b are respectively constituted by the outer surface of the ridge 21 facing the tool outer peripheral side and the surface facing the tool tip side. Although an example has been shown, the present invention is not limited to this, and other surfaces 21a, 21b, 2
1c may be formed so as to face the reference position of the mounting position of the chip 6 and serve as a mounting reference plane. In addition, ridge 2
1, the outer peripheral surface 2a or the tip surface 2 of the tool body 2
b may be formed so as to face the reference position of the mounting position of the chip 6 and serve as a mounting reference plane. Here, the mounting reference plane may be provided on only one surface, or may be provided on three or more surfaces. Further, a mark may be provided on the mounting reference plane to indicate which surface is the mounting reference plane. As the mark, for example, a dent or a projection, a mark of a character or a figure, or the like can be used.

In the above-described embodiment, an example is shown in which a round indexable insert having four mounting flat surfaces 15 is used as the insert 6, and two receiving surfaces are provided on the insert mounting seat 4 of the tool body 2. However, the present invention is not limited to this, and the number of the mounting plane 15 and the number of receiving surfaces may be arbitrary as long as the mounting plane 15 is provided so as to be rotationally symmetric with respect to the center axis of the throw-away tip. Further, in the above-described embodiment, the example in which the tool 1 has the two tip mounting seats 4 is shown, but the present invention is not limited to this, and the number and shape of the tip mounting seats may be arbitrary. Then, one of the plurality of chip mounting seats may be provided with a receiving surface shifted from the other chip mounting seat. Further, the tool 1 is not limited to a turning tool, but may be a turning tool.

[0022]

According to the indexable cutting tool of the present invention, the positioning of the indexable insert is indicated by the positioning portion provided on the tool main body. The seat can be easily and accurately brought into surface contact with the side wall of the seat. Further, since the positioning portion is located on the outer surface of the tool body, it can be visually confirmed whether or not the throw-away tip is correctly attached to the tip attachment seat. In addition, by configuring the positioning portion with the mounting reference plane, the positioning of the throw-away tip is performed by matching the mounting reference plane and the mounting plane of the throw-away tip, that is, by matching these planes, thereby improving the mounting accuracy. Can be done.

By providing a display portion for indicating the mounting position of the throw-away tip with respect to the tip mounting seat, the mounting position of the throw-away tip can be easily confirmed, and the throw-away tip can be moved with respect to the tip mounting seat. Easy and accurate installation.

[Brief description of the drawings]

FIG. 1 is a side view of a tip portion of a throw-away type cutting tool according to an embodiment of the present invention.

FIG. 2 is a view showing a tip mounting seat of the indexable cutting tool according to the embodiment of the present invention.

FIG. 3 is a front view showing the indexable cutting tool according to the embodiment of the present invention.

FIG. 4 is a side view showing an outer peripheral surface of the indexable cutting tool according to the embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1 throw-away type cutting tool 2 tool body 2a outer peripheral surface (outer surface of tool body) 2b tip surface (outer surface of tool body) 4 chip mounting seat 4a bottom surface 4b side wall portion 6 throw-away tip 11 lower surface 12 upper surface 13 side surface 14 cutting edge 15 Mounting plane 21a
Base outer peripheral surface (outer surface of tool main body) 21b Distal outer peripheral surface (outer surface of tool main body) 21c
Surface on the tip rotation axis side (outer surface of tool body) 31a First mounting reference plane (positioning portion) 31b
Second mounting reference plane (positioning section) 34 Display section

Claims (3)

[Claims] 1. A throwaway insert having a cutting edge formed on an upper surface opposed to a lower surface forming a seating surface, and a throwaway insert having a plurality of mounting planes provided on a side surface thereof, mounted on a chip mounting seat of a tool body. A cutting tool, wherein the tip mounting seat has a bottom surface that receives a lower surface of the throw-away tip, and a side wall portion that rises from the bottom surface and receives the mounting plane of the throw-away tip, At least one of the outer surfaces of the tool body that intersects the bottom surface of the tip mounting seat is provided with a positioning portion corresponding to a mounting plane of the throw-away tip mounted on the tip mounting seat. Indexable cutting tool. 2. The indexable cutting tool according to claim 1, wherein the positioning portion is a mounting reference plane. 3. The indexable cutting tool according to claim 1, wherein the tool main body is provided with a display unit that indicates a mounting position of the indexable insert with respect to the insert mounting seat.