JPH0623376Y2 - T slot cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a clamp type T-slot cutter, and in particular, it has a small blade width of, for example, 10 to 15 mm.

(Prior Art) Conventionally, as a T-slot cutter of this type, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 57-170914, a clamp type cutter in which a cemented carbide tip is screwed is disclosed.

In other milling tools, the throw-away tip is fixed by a front wedge, No. 61-89419 gazette, and an engaging projection is formed on the bottom surface of the tip. Japanese Patent No. 55807 is disclosed.

(Problems to be Solved by the Invention) However, the screwed T slot cutter described above may loosen the screw due to cutting heat, and is not suitable for the T slot cutter which is a cantilever cutting mode. There was a point.

Also, depending on the work piece, a narrow blade width is required. In this case, it is necessary to have high chip attachment strength and low cutting resistance.
There is a problem that cannot be dealt with by simply adopting the structure shown in Japanese Patent No. 9419 and Japanese Utility Model Laid-Open No. 58-55807.

In view of the above, the present invention intends to improve the T slot cutter, which is a cantilever cutting method, including the clamp mechanism and the tip shape so that the blade width can be made as narrow as possible.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned points, and a handle portion extends axially in a central portion of a disk-shaped tool body, and an outer peripheral portion of the tool body is provided. In the mounting groove provided in
This is an improvement on the premise of a T-slot cutter in which a cutting edge tip is attached by a wedge piece and a set screw.

That is, the attachment groove provided in the tool body is formed by connecting two groove portions in series, and one groove portion that receives the cutting edge tip has a recessed surface that presents a V-shape in the axial cross section on its standing side wall. The other groove portion that is provided and receives the wedge piece is deeper than the groove portion, and has a screw hole on the bottom surface.

Further, the cutting blade tip has a substantially rectangular plate shape, and a convex surface that fits the concave surface of the groove portion is formed on the bottom surface side, and the cutting edge portion has a blade tip portion at both ends in the longitudinal direction on the upper surface side. It is formed to have a rotationally symmetrical inclined surface in the width direction,
A press receiving surface for the wedge piece is formed at the intermediate portion. The reason why such a cutting edge tip using two corners is applied is not only for the economical efficiency of the tool but also for increasing the attachment strength by increasing the length of the cutting edge tip in the longitudinal direction. When it is incorporated into, the rake angle α in the axial direction is made to be a regular angle by the inclined surface of the cutting edge portion.

Further, the wedge piece is provided in the other groove portion of the mounting groove, the upper surface of the cutting edge tip side is provided with a pressing surface for press-contacting the pressing receiving surface, and the outer peripheral surface presenting a concave surface, A mounting hole is formed and is continuous with a chip pocket provided in the tool body. This is to ensure the attachment of the cutting edge tip and to improve the chip discharge property.

In addition, the set screw is inserted from the mounting hole of the wedge piece,
It is adapted to be screwed into the screw hole on the bottom surface of the groove for receiving the wedge piece.

(Operation) The T-slot cutter of the present invention is of a two-corner type in which the cutting edge tip has a substantially rectangular plate shape, and the pressing receiving surface at the intermediate portion in the longitudinal direction is pressed and fixed by the wedge piece. In addition, since a convex surface is formed to prevent lateral displacement of the cutting edge tip, an effective clamping action can be obtained.

Furthermore, since the cutting edge tip is configured so that the axial rake angle α in the blade width direction has an inclined surface forming a regular angle,
The reduction of cutting resistance is also taken into consideration.

Therefore, the T-slot cutter of the present invention can be applied to blades having a blade width of about 10 to 15 mm because of improved mounting strength and reduced cutting resistance.

(Embodiment) An embodiment of the T-slot cutter of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, (1) is a disk-shaped tool main body, and a shaft portion extending in the axial direction is provided in the central portion thereof.
(2) is integrally provided.

Then, in the outer peripheral portion of the tool body (1), the mounting groove (3)
Is provided, and inside the mounting groove (3), the cutting edge tip (4),
The wedge piece (5) and the set screw (6) are respectively incorporated.

That is, the mounting groove (3), the groove portion (3a) (3b) for receiving the cutting blade tip (4) and the wedge piece (5), respectively, is continuously provided, and one groove portion (3a for receiving the cutting blade tip (4) is provided. In the standing side wall of), a concave surface (7) having a V-shape in an axial cross section is formed. In this way, the recessed surface (7) is directly dug in the tool body (1) in consideration of minimizing the strength reduction of the tool body (1).

The other groove (3b) for receiving the wedge piece (5) is
It is deeper than (3a) and has a screw hole (8) on its bottom surface. The reason why the groove portion (3b) is deeply formed is that the wedge piece (5) is stably received.

Further, the cutting edge tip (4) has a two-corner type and a substantially rectangular plate shape, as clearly shown in FIGS. 5 (a) to (c). Then, on the bottom surface side of the cutting blade tip (4), a convex surface is formed so as to fit the concave surface (7) of the groove portion (3b).
(9) is formed. Further, on the upper surface side of the cutting blade tip (4), a rotationally symmetrical blade edge portion (10) is formed at both ends in the longitudinal direction, and an intermediate portion thereof is a pressure receiving surface (1) for the wedge piece (5).
1). In addition, the cutting edge of the cutting tip (4)
(10) is a rotationally symmetric inclined surface (1) so that a positive rake angle α in the axial direction is formed when it is incorporated into the tool body (1).
It is 0a). And this cutting edge tip (4) is α =
10 ° is shown, and when incorporated into the tool body (1), a radial rake angle β is also given.

In addition, the wedge piece (5) has a pressing surface (12) formed on the upper side surface facing the cutting edge tip (4) side, and the outer peripheral surface of the recessed surface is mounted to receive the set screw (6). A hole (13) is drilled.
Then, the set screw (6) is fitted and inserted through the mounting hole (13), and the set screw (6) is screwed into the screw hole (8) as clearly shown in FIG. Has become. The outer peripheral surface of the wedge piece (5) is continuous with the chip pocket (14) provided in the tool body (1).

6 to 8 show a modified example of the T-slot cutter, in which the cutting blade tip (4) is incorporated in a so-called staggered blade form. In this case, the tool specifications of the T-slot cutter are as follows: the tip diameter D is D = φ50 mm, the blade width W is W = 12 mm,
The number of blades is set to 4. Regarding the aforementioned rake angle α in the axial direction, as shown in FIG. 8, if it is close to the handle portion (2) side, it forms an angle α toward the tip side, and in short, it is not a parallel relationship. It is in the opposite direction.

(Effects of the Invention) As described above, the present invention provides the tool body (1) with 2
A mounting groove (3) consisting of two groove parts (3a) and (3b) is formed, and a two-corner type cutting blade tip (4) made of a substantially rectangular plate is installed in this mounting groove (3) so as not to laterally shift. , Wedge pieces
It is designed to be attached by (5) and set screw (6). Therefore, the mounting strength is increased. In addition, in the cutting edge part (10) of the cutting blade tip (4),
Since a rotationally symmetrical inclined surface (10a) is formed and a positive axial rake angle α is formed at the time of assembling, cutting resistance can be reduced. With these configurations, there is an advantage that it can be applied to a clamp type T-slot cutter having a narrow blade width.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the T-slot cutter of the present invention, and FIG. 2 is II in FIG.
-II A side view in the direction of the arrow, FIG. 3 is a top view of FIG. 2, FIG. 4 is a partial side view in which the mounting state of the cutting blade tip is enlarged, and FIGS. 5 (a)-(c). Is a diagram showing the cutting edge tip, (a)
Is a front view, (b) is a side view, (c) is a bottom view, FIG. 6 is a partially cutaway front view showing a modified example of the T slot cutter of the present invention, and FIG. 7 is a side view. FIG. 8 and FIG. 8 are top views of FIG. (1) …… Tool body, (2) …… Handle part (3) …… Mounting groove, (3a) (3b) …… Groove part (4) …… Cutting blade tip, (5) …… Wedge piece (6 ) …… Set screw, (7) …… Recessed surface (8) …… Screw hole, (9) …… Convex surface (10) …… Blade edge part, (10a) …… Inclined surface (11) …… Pressing receiving surface , (12) …… Pressing surface (13) …… Mounting hole, (14) …… Chip pocket

Claims (1)

[Scope of utility model registration request] 1. A handle portion (2) extends axially in a central portion of a disk-shaped tool body (1), and a mounting groove (3) provided in an outer peripheral portion of the tool body (1). Inside is a cutting tip (4)
In the T-slot cutter, which is attached by a wedge piece (5) and a setscrew (6), the attachment groove (3) is formed by connecting two groove portions (3a) and (3b), respectively, One groove portion (3a) for receiving the blade tip (4) is provided with a concave surface (7) having a V-shape in an axial cross section on its standing side wall, and the other groove portion (5) for receiving the wedge piece (5). 3b) is deeper than the groove portion (3a), the bottom surface is provided with a screw hole (8), the cutting edge tip (4) has a substantially rectangular plate shape, the On the bottom surface side, a convex surface (9) that fits the concave surface (7) of the groove portion (3) is formed, and on the upper surface side, the blade tip portions (10) in the blade width direction at both ends in the longitudinal direction. Rotationally symmetrical inclined surface (10a)
And the pressing receiving surface (11) against the wedge piece (5) is formed in the middle part of the tool body, and the cutting edge tip (4) has a rake angle β in the radial direction.
When incorporated into (1), the inclined surface of the cutting edge portion (10) constitutes a positive rake angle α in the axial direction, and the wedge piece (5) has a mounting groove (3). In the groove portion (3b), the upper surface of the cutting edge tip (4) side is provided with a pressing surface (12) for press-contacting the pressing receiving surface (11), and the outer peripheral surface presenting a concave surface. , The mounting hole (13) is drilled and the tool body (1)
The set screw (6) is inserted from the mounting hole (13) of the wedge piece (5) to receive the wedge piece (5). A T-slot cutter characterized by being screwed into the screw hole (8) of 3b).