JPH09123009A - Throw-away type t slot cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cutting efficient by a throw-away chip becoming the real number of edges at the time of cutting. SOLUTION: Regarding a throw-away type T slot cutter provided with an even number of chip fitting parts 5a on a cutting head 3 provided on the tip of a tool body 1 in the circumferential direction at equal intervals and having a throw-away chip fitted to the chip fitting parts 5a, the throw-away chips are composed of a large size chips 6 and a small size chips 7 and one each of the large size chip 6 and the small size chip 7 are arranged on the chip fitting parts 5a in the axial direction of the cutting head 3, while the large size chip 6 and the small size chip 7 are alternately arranged in the circumferential direction of the cutting head 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away T-slot cutter used for T-groove machining.

[0002]

2. Description of the Related Art A throw-away type T-slot cutter, which is mounted on a main shaft of a machine tool and is rotated, is relatively traversed along a groove provided in a workpiece in advance to perform T-groove machining. It is known from Japanese Utility Model Publication No. 60-183111 and Japanese Utility Model Publication No. 63-21512.

In this T-slot cutter, a cutting head is integrally provided at the tip of a shank, and a chip discharge pocket and a chip mounting portion are alternately arranged in the circumferential direction of the cutting head. A throw-away tip is removably attached to the tip attaching portion with a bolt.

The throw-away tips are composed of right-handed and left-handed tools, and are offset in the axial direction and arranged in a zigzag pattern in the circumferential direction. The cutting marks of both throw-away tips overlap each other and are right-handed and left-handed. It is designed to be cut by the width between the outer end faces of the chips.

[0005]

However, as described above, when the right-handed and left-handed throw-away tips are axially offset and arranged in a zigzag pattern in the circumferential direction, they correspond to the chip discharge pockets. The number of blades is 1/2 that of the chip mounting part provided, and in the case of two blades, the number of blades is one, and in the case of four blades, the number of blades is two. There is a problem that cutting efficiency is poor.

Further, two kinds of throw-away chips, right-handed and left-handed, are required, and the number of stocks is large, and it is troublesome in terms of parts management. Further, in the throw-away tip, the rotation direction receiving surface on the side opposite to the rake surface is formed at a right angle to the tip seating surface. The chip mounting portion is formed with a chip mounting seat surface facing the chip seating surface and a chip mounting receiving surface facing the rotational direction receiving surface at a right angle, and the throw-away chip is bolted to the chip mounting seating surface. Fixed. Therefore, there is a problem that the insert mounting seat surface of the throw-away tip may float due to cutting resistance during cutting.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the cutting efficiency because the throw-away tip mounted on the tip mounting portion becomes the actual number of blades at the time of cutting. (EN) Provided is a throw away type T slot cutter capable of

Another object is to use a throw-away tip of right-handed and a left-handed one in common, which can reduce the number of stocks and can prevent the throw-away tip from rising due to cutting resistance during cutting. The purpose is to provide a formula T slot cutter.

[0009]

In order to achieve the above-mentioned object, the present invention provides a cutting head provided at the tip of a tool body, wherein an even number of chips are mounted at equal intervals in the circumferential direction. In the throw away type T-slot cutter in which parts are provided and the throw away tips are attached to these tip attaching portions, the throw away tips include a large tip and a small tip, and each of the tip attaching portions has the large tip. One small tip is arranged in the axial direction of the cutting head, and the large tip and the small tip are alternately arranged in the circumferential direction.

According to a second aspect of the present invention, there is provided a cutting away type T-slot cutter in which tip mounting portions are provided at equal intervals in a circumferential direction on a cutting head provided at a tip portion of a tool body, and throw-away tips are mounted on these tip mounting portions. The throw-away tip is a rhombus when viewed from the mounting direction, has a rake face on the surfaces adjacent to each other with one obtuse angle portion, and has a rotation direction receiving surface on the surfaces adjacent to each other with the other obtuse angle portion interposed. It is characterized by doing.

According to a third aspect of the present invention, the throw-away tip of the second aspect has a rotation direction receiving surface at an acute angle with respect to the tip seat surface, and the tip mounting portion has a tip mounting seat surface facing the tip seat surface. And a chip mounting receiving surface facing the rotation direction receiving surface.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a throw-away T-slot cutter, 1 is a tool body, and a cutting head 3 is integrally provided at the tip of a shank 2 of the tool body 1. The cutting head 3 is shown in FIG.
As also shown, the chip discharge pockets 4a to 4d are provided at four locations, for example, at equal intervals in the circumferential direction.

The chip discharge pockets 4a to 4d are formed by cutting in a substantially V shape, and chip mounting portions 5a to 5d are provided on the side surfaces of the chip discharge pockets 4a to 4d facing the rotation direction of the tool body 1. Has been.

These tip mounting portions 5a to 5d are provided with a large tip 6 and a small tip 7 as throw-away tips.
It has a recess 8 for fixing and, and the bottom of this recess 8 is provided with a screw hole 9 that opens in the radial direction of the tool body 1 (see FIG. 5).

Then, one large chip 6 and one small chip 7 are arranged in the recesses 8 of the chip mounting portions 5a to 5d in the axial direction of the cutting head 3, and the large chip 6 and the small chip are arranged in the circumferential direction. 7 and 7 are arranged alternately. That is, the tip mounting portions 5a and 5c are provided with the large tip 6 on the upper side of the cutting head 3 and the small tip 7 on the lower side thereof, and the tip mounting portions 5b and 5d are provided with the small tip 7 above the cutting head 3. , A large chip 6 is provided on the lower side. Therefore, the large chips 6 and the small chips 7 are arranged in a zigzag pattern in the circumferential direction of the cutting head 3, and the large chips 6 and the small chips 7 are fixed to the screw holes 9 by tightening screws 10 from the outer peripheral side.

The large chip 6 and the small chip 7 have basically the same shape and are constructed as shown in FIGS. That is, the chip body 11 is a plan view, that is, a rhombus when viewed from the mounting direction, and has the rake faces 12a and 12b on the surfaces adjacent to each other with one obtuse angle portion 11a sandwiched therebetween, and with the other obtuse angle portion 11b sandwiched therebetween. Rotation direction receiving surface 1
3a and 13b are provided.

Further, the rotation direction receiving surfaces 13a and 13b of the chip body 11 are formed at an acute angle (for example, 85 °) with respect to the chip seating surface 15 except for the distal end portions 14 with respect to the chip seating surface 15. For example, a step portion 16 is formed between the distal end portion 14 of 90 °.

Further, the concave portions 8 of the chip mounting portions 5a to 5d
The chip mounting receiving surface 17 facing the rotational direction receiving surfaces 13a and 13b in FIG. 2 is at an acute angle (for example, 85 to the chip mounting seating surface 18 facing the chip seating surface 15).
)) And the rotation direction receiving surface 13 of the chip body 11
The a and 13b are in close contact with the chip mounting receiving surface 18.

Further, an insertion hole 19 through which the tightening screw 10 is inserted is formed in the center of the chip body 11.
Tighten with the rotation direction receiving surfaces 13a and 13b of the chip body 11 closely attached to the chip attachment receiving surface 17 of the recesses 8 of the chip attachment portions 5a to 5d and the chip seat surface 15 closely attached to the chip mount seat surface 18. By tightening the screw 10 in the screw hole 9, even if a force is applied to the rake surfaces 12a and 12b of the chip body 11 in the upward direction during processing, the rotational direction receiving surfaces 13a and 13b and the chip mounting receiving surface 18 are wedge-coupled. Therefore, the chip body 11 can be prevented from rising.

Further, the chip mounting portions 5a to 5d allow the chip mounting direction to be right-handed or left-handed. However, since the chip bodies 11 of the large chip 6 and the small chip 7 are rhombic, the large chip 6 is In this case, it is possible to attach the rake face 12b in the rotation direction when the hand is right-handed and the rake face 12a in the rotation direction when the hand is left-handed.

Next, the operation of the throw-away type T-slot cutter constructed as described above will be described. Tool body 1
Attach the shank part 2 of the to the spindle of the machine tool and rotate it.
Position the cutting head 3 on the end surface of the workpiece,
When the tool body 1 is relatively fed laterally along the groove previously machined in the work piece, the cutting edges of the large tip 6 and the small tip 7 alternately hit the work piece to cut the work piece. A T groove is formed.

In this case, the large-sized tip 6 and the small-sized tip 7 are arranged side by side, but the cutting marks of the large-sized tip 6 and the small-sized tip 7 overlap each other.
The large chip 6 and the small chip 7 are cut to have a width between the distal ends thereof.

Further, during processing, a force (arrow F) is applied to the rake face 12a or 12b of the chip body 11 in a floating direction.
Even if is added, since the rotation direction receiving surfaces 13a and 13b and the chip mounting receiving surface 18 are wedge-coupled, the chip body 11 can be prevented from rising.

According to the above embodiment, four chip mounting portions are provided at equal intervals in the circumferential direction of the cutting head, and a large chip and a small chip are axially adjacent to each other at each chip mounting portion. Thus, a total of eight chips are provided, but the number of chip mounting portions is not limited to any number, as long as large chips and small chips are alternately provided in the circumferential direction.

[0025]

As described above, according to the first aspect of the present invention, the throw-away tip is made into a large tip and a small tip, and the large tip and the small tip are attached to each tip mounting portion. By arranging one by one in the direction and alternately arranging the large tip and the small tip in the circumferential direction, the throw-away tip attached to the tip attachment part becomes the actual number of blades during cutting, improving the cutting efficiency Can be achieved.

According to the second aspect, the throw-away tip is a rhombus when viewed from the mounting direction, and has a rake face on a surface adjacent to one obtuse angle portion and an adjacent surface on the other obtuse angle portion. By providing the direction-of-rotation receiving surface on the right-hand side, right-handed and left-handed throw-away chips can be shared, and the stock quantity can be reduced.

According to the present invention, the throw-away tip has a rotation-direction receiving surface which forms an acute angle with respect to the tip seat surface.
Since the chip mounting portion has a chip mounting seat surface facing the chip seating surface and a chip mounting receiving surface facing the rotational direction receiving surface, the throw-away chip is lifted by cutting resistance during cutting. There is an effect that can prevent.

[Brief description of the drawings]

FIG. 1 is an overall side view of a throw-away T-slot cutter according to an embodiment of the present invention.

FIG. 2 is an end view of the cutting head of the T-slot cutter of the same embodiment.

FIG. 3 is a perspective view of the throw-away tip of the same embodiment.

FIG. 4 shows a throw-away tip of the same embodiment,
(A) is a plan view, (b) is a side view seen from the direction of arrow A,
(C) is a side view seen from the arrow B direction.

FIG. 5 is a vertical cross-sectional side view showing a state in which the throw-away tip of the same embodiment is attached to a tip attaching portion.

[Explanation of symbols]

 1 ... Tool body 2 ... Shank 3 ... Cutting head 5a-5d ... Tip mounting part 6 ... Large tip 7 ... Small tip 12a, 12b ... Rake surface 13a, 13b ... Rotation direction receiving surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Shimada 580 Horikawa-cho, Kawasaki-shi, Kanagawa Prefecture Solid Square Toshiba Tungaloy Co., Ltd. Company Numazu Office

Claims (3)

[Claims] 1. A throwaway type T-slot cutter in which a cutting head provided at the tip of a tool body is provided with an even number of tip mounting portions at equal intervals in the circumferential direction, and a throw-away tip is mounted on these tip mounting portions. The throw-away tip is composed of a large tip and a small tip, and one large tip and one small tip are arranged in each of the tip mounting portions in the axial direction of the cutting head, and the tip is arranged in the circumferential direction. Throw-away type T-slot cutter characterized by alternately arranging large chips and small chips. 2. The cutting head provided at the tip of the tool body is provided with tip mounting portions at equal intervals in the circumferential direction,
In a throw away type T slot cutter in which a throw away tip is attached to these tip attaching parts, the throw away tip is a rhombus when viewed from the attaching direction, and has a rake face on an adjacent surface across one obtuse angle portion. A throw-away T-slot cutter having rotation direction receiving surfaces on surfaces adjacent to each other across the other obtuse angle portion. 3. The throw-away tip has a rotation direction receiving surface at an acute angle with respect to the tip seat surface, and the tip mounting portion has a tip mounting seat surface facing the tip seat surface and the rotation direction receiving surface. The throw-away type T-slot cutter according to claim 2, further comprising a chip mounting receiving surface facing the chip mounting receiving surface.