JP2551644Y2 - Indexable cutting tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a throw-away tip (hereinafter, referred to as a "tip") through a seat member on a tip mounting seat of a tool body.
Abbreviated as chip. ) Is mounted on a throw-away type cutting tool (hereinafter, abbreviated as a cutting tool) such as an end mill or a face mill.

[0002]

2. Description of the Related Art FIGS. 9 and 10 or FIGS. 11 and 12 show examples of a tip clamping mechanism in such a cutting tool. In these figures, reference numeral 1 denotes a tool main body made of a steel material or the like, reference numeral 2 denotes a chip pocket formed in the tool main body 1, and reference numeral 3 denotes a tool rotation direction of the chip pocket 2 (from right to left in each figure). A chip mounting seat 4 formed on the rear side is a flat chip made of a hard material such as a cemented carbide which is mounted on the chip mounting seat 3. 9 and 11 show examples in which a chip 4 having a flat rake face 4A is mounted, and FIGS. 10 and 12 show the top face 4A of the upper face 4A. This is an example in which a chip 4 with a breaker with a concave inside is mounted.

Here, in the examples shown in FIGS. 9 and 10,
The chip 4 is mounted on the chip mounting seat 3 via a flat sheet member 5. A recess 6 is formed on the bottom surface of the tip pocket 2 in front of the tip mounting seat 3 in the tool rotation direction, and a wedge member 7 is inserted into the recess 6. Then, by inserting the wedge member 7 into the concave portion 6 with a clamp screw (not shown) or the like, the upper surface 4A of the chip 4 is pressed toward the bottom surface 3A of the chip mounting seat 3 in the tool rotation direction, and the tool body 1 Fixed to In this example, the position of the cutting edge 4B of the chip 4 is determined by the side surface 4C of the chip 4 abutting against the wall surface 3B of the chip mounting seat 3.

On the other hand, in the examples shown in FIGS. 11 and 12,
A through hole 4D is formed in the chip 4 in the thickness direction, and a chip clamp screw hole 3C is formed in the bottom surface 3A of the chip mounting seat 3.
Is fixed to the tool body 1 by screwing the tip clamp screw 8 inserted into the tool clamp screw hole 3C into the tip clamp screw hole 3C.

[0005]

However, first, in the example shown in FIGS. 9 and 10, the chip 4 is pressed and fixed by the wedge member 7 from the upper surface 4A which is the rake face, and the upper surface 4A is fixed. Is inevitably covered by the wedge member 7, which may be an obstacle, which may hinder the discharge of chips generated by the cutting blade 4 </ b> B. Further, since the volume of the tip pocket 2 is reduced by the wedge member 7, there is a possibility that chip clogging may occur.

On the other hand, in the examples shown in FIGS. 11 and 12, the tip 4 is directly attached to the tip mounting seat 3 by the tip clamp screw 8 without using a wedge member or the like. There is nothing like that. However, the upper surface 4A to be the rake face of the chip 4
In order for the tip clamp screw 8 to be perpendicular to the tool rotation direction, the tip clamp screw hole 3 </ b> C screwed to the tip clamp screw 8 must be formed along the tangential direction of the tool body 1. In order to form such a screw hole on the bottom surface 3A of the chip mounting seat 3 facing the tool rotation direction, FIG.
As shown in FIGS. 1 and 12, the tip pocket 2 must also be formed along the tangential direction of the tool body 1, so that the width W of the individual tip pockets 2 in the circumferential direction of the tool body 1 is as shown in FIGS. It must be larger than the example shown in FIG. As a result, in the cutting tool shown in FIGS. 11 and 12, the number of chip pockets 2 that can be formed in the tool body 1 having a fixed size, that is, the number of chips 4 that can be mounted in the tool body 1 is naturally limited. As a result, there is a problem that the cutting load acting on the individual chips 4 is increased and the life of the chips is shortened.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve such a problem. In a cutting tool having a chip detachably mounted on a chip mounting seat formed in a tool body, A sheet member having a chip clamp screw hole is interposed between the chip and the chip mounting seat, and the sheet member is pressed and fixed to the bottom surface side of the chip mounting seat by the clamp member, while the chip is mounted on the chip member. At least one side surface is brought into contact with the wall surface of the chip mounting seat, and a chip clamp screw inserted into the chip is screwed into the chip clamp screw hole and fixed to the sheet member.

[0008]

In the cutting tool having such a configuration, the chip is attached to the sheet member by a tip clamp screw, and the sheet member is attached to the tool body by a clamp member such as a wedge member. Therefore, the insert can be fixed to the tool body without directly pressing the upper surface of the insert with a wedge member as in a conventional cutting tool, and the chip upper surface can be prevented from being covered with the wedge member, thereby enabling smooth chip discharge. At the same time, the volume of the tip pocket can be secured. In addition, since the tip clamp screw hole into which the tip clamp screw is screwed is formed in the sheet member, it is necessary to form the tip pocket along the tangential direction of the tool body in order to form such a screw hole. It is possible to prevent the circumferential width of the chip pocket from becoming unnecessarily long.

[0009]

1 to 5 show an embodiment in which the present invention is applied to a face mill. In these figures, the tool main body 11 is formed of a steel material or the like, has a multi-stage cylindrical shape whose diameter increases toward the tip end side, and has an inner peripheral portion having a mounting hole 11A for mounting on a spindle end or the like of a machine tool. Have been. A plurality of tip pockets 12 are formed at regular intervals along the circumferential direction on the outer periphery of the tip end of the tool body 11.
A chip mounting seat 13 is formed at the rear of the tool rotation direction (counterclockwise direction in FIG. 2).

The tip mounting seat 13 has a substantially rectangular bottom surface 13A extending in the direction of the tool axis O as viewed from the front side in the tool rotation direction, and two wall surfaces rising from the bottom surface 13A and directed forward in the tool rotation direction. 13B and 13C are provided. Of these wall surfaces 13B and 13C, the wall surface 13B intersecting in the tool radial direction is formed with a convex portion 13D bulging outward in the tool radial direction at a front portion in the tool rotation direction. Among the wall surfaces 13B and 13C, a wall surface 13C extending along a direction perpendicular to the tool axis O direction has a bottom surface 13C.
An escape 13E is formed at the intersection with A. Furthermore, on the base end side of the tip mounting seat 13 in the tool axis O direction and on the front side of the tip mounting seat 13 in the tool rotation direction,
A recess 14 is formed to be recessed radially inward of the tool body 11 from the tip pocket 12, and a bottom surface 14 of the recess 14 is formed.
A has a not-shown clamp screw hole.

On the other hand, in this embodiment, the chip 15 mounted on the chip mounting seat 13 has a substantially square plate shape formed of a hard material such as a cemented carbide as shown in FIGS. It is a positive type chip, and is a chip with a breaker whose upper face 15A serving as a rake face is depressed inward in the chip thickness direction. The upper surface 1 of the chip 15
A cutting edge 15C is formed at the intersection ridge line between 5A and each side surface 15B. Further, the chip 15 has the upper surface 15A and the lower surface 1 penetrating the chip 15 in the thickness direction.
An insertion hole 15E that opens at the center with the 5D is formed.

In this embodiment, the chip 1 having such a configuration is used.
5 is mounted on the chip mounting seat 13 via the sheet member 16. In the present embodiment, the sheet member 16 is a substantially rectangular plate-shaped member made of a hard material such as a cemented carbide like the chip 15, and its upper and lower surfaces 16A, 16A
The shape and size of B are the bottom surface 13A of the chip mounting seat 13.
Is set substantially equal to The thickness of the sheet member 16 is set so as to be smaller than the heights of the wall surfaces 13B and 13C of the chip mounting seat 13. In particular, as shown in FIG.
Is set smaller than the height up to the projection 13D. Further, the sheet member 16 has a tip clamp screw hole 16C penetrating the sheet member 16 in the thickness direction.
The sheet member 16 is formed so as to open to one end face 16D side from the center in the longitudinal direction of the upper surface 16A.

The sheet member 16 has a lower surface 16B.
Is brought into close contact with the bottom surface 13A of the chip mounting seat 13, the one end surface 16D is directed toward the front end side in the tool axis O direction, the other end surface 16E is brought into contact with the wall surface 13C of the chip mounting seat 13, and the one side surface 16F is The tip clamp screw hole 16C is mounted on the tip mounting seat 13 in contact with the wall surface 13B so that the tip clamp screw hole 16C is opened toward the tip end of the tip mounting seat 13 in the tool axis O direction in the tool rotation direction. Be placed. On the other hand, a wedge member 17 as a clamp member in the present embodiment is inserted into the concave portion 14 formed forward of the tip mounting seat 13 in the tool rotation direction. The wedge member 1 is used for the sheet member 16.
7 is screwed into the above-mentioned clamp screw hole and tightened, whereby the pressing surface 17A of the wedge member 17 is pressed toward the bottom surface 13A of the chip mounting seat 13 and fixed to the tool body 11. You.

In this embodiment, a flat supporter 19 is interposed between the pressing surface 17A of the wedge member 17 and the upper surface 16A of the sheet member 16. In the present embodiment, the supporter 19 is a rectangular flat plate-like member formed of a hard material such as a cemented carbide like the chip 15 and the sheet member 16, and its upper and lower surfaces 19A and 19B are respectively formed by the pressing surface 17A and the pressing surface 17A. The upper surface 16A of the sheet member 16 is brought into close contact with one side surface 19C of the sheet member 16 in the direction of the tool axis O, and the other side surface 19D opposite to the side surface 19C is connected to the wall surface 1 of the chip mounting seat 13.
It is narrowly mounted between the wedge member 17 and the sheet member 16 in contact with the 3C. Thus, the sheet member 16
Is fixed to the chip mounting seat 13, the upper surface 16 </ b> A of the sheet member 16, the projection 13 </ b> D of the wall surface 13 </ b> B of the chip mounting seat 13, and the supporter 19 are provided on the chip mounting seat 13.
Is defined by the one side surface 19C, and a recess is formed in the tip pocket 12 and the distal end surface and the outer peripheral surface of the tool body 11. The tip clamp screw hole 16C is set to open substantially at the center of the upper surface 16A of the sheet member 16 in this recess.

In the chip 15, the lower surface 15D is brought into close contact with the upper surface 16A of the sheet member 16 in this recess, and one of the two side surfaces 15B, 15B intersecting with each other is brought into contact with the convex portion 13D and the other side. Is brought into contact with the one side surface 19C of the supporter 19, and is mounted in a recess formed in the chip mounting seat 13. Further, in this state, the two side surfaces 15B,
Cutting blade 1 connected to two side surfaces 15B, 15B other than 15B
5C and 15C are set so as to slightly protrude from the distal end surface and the outer peripheral surface of the tool body 11, respectively, and the insertion hole 15E of the tip 15 and the tip clamp screw hole 16 are provided.
C is disposed substantially coaxially with C. The tip 15 is inserted through the sheet member 16 by inserting the tip clamp screw 20 into the insertion hole 15E, screwing it into the tip clamp screw hole 16C, and fastening. To be fixed to the tool body 11. In addition, an inclination angle is given to the surface of the protrusion 13D facing the tool outer peripheral side and one side surface 19C of the supporter 19 in accordance with the clearance of the side surface 15B of the tip 15.

In the cutting tool having such a configuration, the tip 1
As shown in FIG. 4, the wedge member 5 and the wedge member 17 are arranged so as to be aligned in the direction of the tool axis O when viewed from the outer peripheral side of the tool. The wedge member 17 does not cover. For this reason, the cutting edges 15C, 15C
The chips generated by the cutting tool flow smoothly into the chip pocket 12 and are discharged. As compared with the conventional cutting tools as shown in FIGS. Generation can be prevented.

Further, in the cutting tool having the above structure, the tip 15
Is screwed into a chip clamp screw hole 16 </ b> C formed in the sheet member 16. Therefore, unlike the conventional cutting tool shown in FIGS. 11 and 12, it is not necessary to form a screw hole in the tool body 11 along the tangential direction, and therefore, the chip pocket is formed along the tangential direction. No need. Thereby, the width W of the tip pocket 12 in the circumferential direction of the tool main body 11 can be suppressed from becoming unnecessarily large. Therefore, the number of the tip pockets 12 that can be formed in the tool main body 11, that is, the tip pocket 12 can be mounted on the tool main body 11. The number of the chips 15 can be increased, the cutting load acting on each of the chips 15 can be reduced, and the cutting efficiency can be improved.

Further, in the present embodiment, the tip 15 has one side surface 15B abutting on the convex portion 13D of the wall surface 13B of the chip mounting seat 13 formed on the tool body 11, and intersects with the one side surface 15B. The other side 15B of the supporter 19 positioned between the sheet member 16 and the wedge member 17 is positioned in contact with one side 19C of the supporter 19. Here, the other side surface 19D opposite to the one side surface 19C of the supporter 19 is brought into contact with the wall surface 13C of the tip mounting seat 13 formed on the tool main body 11, and as a result, The tip 15 has one side surface 15B directly in contact with the tool body 11 and the other side surface 1B.
5B also comes into contact with the tool body 11 via the supporter 19 and is positioned. For this reason, according to the present embodiment, the tip 15 is connected to the tool body 1 via the sheet member 16.
Despite being fixed at 1, the position accuracy can be ensured at a high level, and the position accuracy of the cutting blades 15C, 15C formed on the tip 15, that is, the so-called run-out accuracy of the cutting edge, can be improved. It becomes possible to plan.

Further, in this embodiment, the sheet member 16
The supporter 19 is formed of a hard material such as a cemented carbide like the chip 15. Therefore, the service life of these members can be extended, and the rigidity around the chip mounting seat 13 can be ensured despite the increase in the number of components as compared with the related art.

In this embodiment, the supporter 19 is interposed between the sheet member 16 and the wedge member 17, but the supporter may not be provided. In this case, for example, the supporter 19 is provided on the upper surface 16A of the sheet member 16.
It is possible to secure the positional accuracy of the chip 15 by providing a step or the like according to the above, and bringing the other side surface 15B of the chip 15 into contact with the step surface between the step and the upper surface 16A. is there. In this embodiment, a positive chip with a breaker as shown in FIGS. 6 and 7 is used as the chip 15, but for example, a chip 15 without a breaker as shown in FIG. A tip may be used. Further, in this embodiment, the case where the present invention is used for a face mill is described. However, the present invention can be used for other milling tools such as a throw-away type end mill, or a throw-away type boring bar, a cutting tool, and the like. .

[0021]

As described above, according to the present invention, the clamp member such as the wedge member does not cover the rake face of the chip, and therefore, the chip discharge performance is improved and the chip clogging is prevented. Can be prevented. On the other hand, since the tip clamp screw for fixing the tip is screwed to the sheet member, it is not necessary to form a screw hole along the tangential direction of the tool main body. There is no restriction due to such screw holes. For this reason, the width of the chip pocket in the circumferential direction of the tool can be prevented from becoming unnecessarily large. The acting cutting load can be reduced, and the cutting efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a face mill showing one embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment shown in FIG.

FIG. 3 is a side view of the vicinity of the tip mounting seat 13 of the embodiment shown in FIG.

FIG. 4 is an enlarged side view around the tip mounting seat 13 of the embodiment shown in FIG.

FIG. 5 is an enlarged front view of the tip mounting seat 13 of the embodiment shown in FIG.

FIG. 6 is a plan view of a chip 15 used in the embodiment shown in FIG.

FIG. 7 is a sectional view taken along the line AA of the chip 15 shown in FIG. 6;

8 is a sectional view showing another example of the chip 15 shown in FIG.

FIG. 9 is a partially broken enlarged front view of the vicinity of a tip mounting seat 3 showing a conventional cutting tool.

FIG. 10 is a partially broken enlarged front view of the vicinity of a tip mounting seat 3 showing a conventional cutting tool.

FIG. 11 is a partially broken enlarged front view of the vicinity of a tip mounting seat 3 showing a conventional cutting tool.

FIG. 12 is a partially cutaway enlarged front view of the vicinity of a tip mounting seat 3 showing a conventional cutting tool.

[Explanation of symbols]

 1,11 Tool body 2,12 Tip pocket 3,13 Tip mounting seat 3A, 13A Bottom surface of tip mounting seat 3B, 13B, 13C Wall surface of tip mounting seat 3C, 16C Tip clamp screw hole 4,15 Tip 5,16 Sheet member 6,14 recess 7,17 wedge member (clamp member) 8,20 chip clamp screw 13D protrusion 19 supporter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Saito 1511 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Pref. Mitsubishi Materials Corporation Tsukuba Works (56)

Claims (2)

(57) [Scope of request for utility model registration] 1. A throw-away type cutting tool in which a throw-away tip is detachably mounted on a tip mounting seat formed on a tool main body, wherein a gap is provided between the throw-away tip and the tip mounting seat.
A sheet member having a chip clamp screw hole is interposed, and the sheet member is pressed and fixed to the bottom side of the chip mounting seat by the clamp member, while the throw away tip is at least one of the throw away tips. One side is brought into contact with the wall surface of the chip mounting seat,
A tip-away type cutting tool, wherein a tip clamp screw inserted into the throw-away tip is screwed into the tip clamp screw hole and fixed to the sheet member. 2. A supporter is interposed between the sheet member and the clamp member, and the throw-away tip has at least one other side of the throw-away tip in contact with the supporter. The indexable cutting tool according to claim 1, wherein: