JP3201943B2 - Indexable T-slot cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a throw-away type T-slot cutter used for processing a T-slot.

[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, rotated, and relatively traversed along a groove provided in a workpiece in advance to perform T-slot machining, is, for example, This is known from Japanese Utility Model Application Laid-Open Nos. 60-183111 and 63-21512.

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

[0004] The throw-away inserts are composed of right-hand and left-hand, and are displaced in the axial direction and are arranged in a staggered manner in the circumferential direction. The cutting traces of the two throw-away tips overlap each other to form right-hand and left-hand. The chip is cut by the width between the outer end faces of the chip.

[0005]

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

Also, two types of right-handed and left-handed throw-away chips are required, so that the number of stocks is large and the parts management is troublesome. In the throw-away tip, the rotational direction receiving surface opposite to the rake face is formed at right angles to the tip seating surface. In the chip mounting portion, a chip mounting seat surface facing the chip seat surface and a chip mounting receiving surface facing the rotation direction receiving surface are formed at right angles, and the throwaway tip is bolted to the chip mounting seat surface. Fixed. Therefore, there is a problem that the insert mounting seat surface of the throw-away tip floats due to the cutting resistance at the time of cutting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to improve the cutting efficiency by making the indexable insert attached to the insert attachment portion substantially the number of teeth during cutting. It is an object of the present invention to provide a throw-away type T-slot cutter capable of performing the above-mentioned steps.

Further, a throw-away type T-slot cutter capable of sharing a right-handed and left-handed throw-away insert, reducing the number of stocks, and preventing floating of the throw-away insert by cutting resistance during cutting. Is to provide.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a cutting head provided at a tip end portion of a tool body, wherein an even number of chips are mounted at equal intervals in a circumferential direction. In the throw-away type T-slot cutter in which a throw-away tip is attached to the tip attaching portion, the throw-away tip comprises a large tip and a small tip, and the large tip and the large tip are attached to each of the tip attaching portions. Small chips are arranged one by one in the axial direction of the cutting head, and the large chips and small chips are alternately arranged in the circumferential direction.

According to a second aspect of the present invention, the indexable insert according to the first aspect has a rhombic shape as viewed from the mounting direction, has a rake face adjacent to one of the obtuse portions, and has a rake face on the other side thereof. It is characterized in that it has a rotation direction receiving surface on an adjacent surface.

According to a third aspect of the present invention, the rotating direction receiving surface of the throw-away tip according to the first or second aspect is at an acute angle with respect to the chip seating surface, and the chip mounting portion has a chip mounting surface facing the chip seating surface. It has a chip mounting receiving surface facing the seat surface and 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 type T-slot cutter, in which 1 is a tool body, and a cutting head 3 is integrally provided at a tip of a shank 2 of the tool body 1. The cutting head 3 is shown in FIG.
As shown in FIG. 4, for example, four chip discharge pockets 4a to 4d are provided at equal intervals in the circumferential direction.

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

The chip mounting portions 5a to 5d are composed of a large chip 6 and a small chip 7 as throw-away chips.
And a screw hole 9 that opens in the radial direction of the tool body 1 is provided at the bottom of the recess 8 (see FIG. 5).

A large chip 6 and a small chip 7 are arranged one by one in the axial direction of the cutting head 3 in the recesses 8 of the chip mounting portions 5a to 5d, and the large chip 6 and the small chip are arranged in the circumferential direction. 7 are alternately arranged. That is, a large chip 6 is provided on the upper side of the cutting head 3 in the chip mounting portions 5a and 5c, and a small chip 7 is provided on the lower side of the cutting head 3, and the small chip 7 is provided on the upper side of the cutting head 3 in the chip mounting portions 5b and 5d. , A large chip 6 is provided on the lower side. Therefore, the large chips 6 and the small chips 7 are arranged in a staggered manner 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 the tightening screws 10 from the outer peripheral side.

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

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

Further, the concave portions 8 of the chip mounting portions 5a to 5d
The chip mounting receiving surface 17 facing the rotation direction receiving surfaces 13a and 13b at the acute angle (e.g., 85)
゜), the bearing surface 13 in the rotation direction of the chip body 11.
a and 13b are brought into 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,
Tightening is performed in a state where the rotation direction receiving surfaces 13a and 13b of the chip main body 11 are in close contact with the chip mounting receiving surface 17 in the concave portions 8 of the chip mounting portions 5a to 5d, and the chip seating surface 15 is in close contact with the chip mounting seating surface 18. By tightening the screw 10 into the screw hole 9, even if a force is applied to the rake faces 12a, 12b of the chip body 11 in the floating direction during machining, the rotational direction receiving faces 13a, 13b and the chip mounting receiving face 18 are wedge-bonded. Therefore, the lifting of the chip body 11 can be prevented.

The chip mounting directions are right-handed and left-handed due to the chip mounting portions 5a to 5d. However, since the chip body 11 of the large chip 6 and the small chip 7 has a rhombus shape, the large chip 6 In this case, the rake face 12b can be mounted with the rake face 12b oriented in the rotation direction when the right hand is used, and the rake face 12a can be mounted with the rake face 12a oriented in the rotation direction when the left hand is used.

Next, the operation of the throw-away T-slot cutter configured as described above will be described. Tool body 1
Is mounted on the main shaft of the machine tool and rotated,
Position the cutting head 3 on the end face of the workpiece,
When the tool main body 1 is relatively traversed along a groove previously machined in the workpiece, the cutting edges of the large-sized insert 6 and the small-sized insert 7 alternately hit the workpiece and cut the workpiece. A T-groove is formed.

In this case, the large chip 6 and the small chip 7 are arranged side by side apart from each other, but since the cutting traces of the large chip 6 and the small chip 7 overlap each other,
The large chip 6 and the small chip 7 are cut to the width between the far ends.

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

According to the above-described 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 provided adjacent to each other in the axial direction at each chip mounting portion. Thus, a total of eight chips are provided, but the large number of chips and the small chips are alternately provided in the circumferential direction, so that the number of chip mounting portions may be an even number, and the number is not limited.

[0025]

As described above, according to the first aspect of the present invention, the throw-away tip is a large tip and a small tip, and the large tip and the small tip are attached to each tip mounting portion by the axis of the cutting head. The large inserts and the small inserts are alternately arranged in the circumferential direction, one at a time in the direction, so that the indexable insert attached to the insert attachment section has the actual number of blades at the time of cutting, improving the cutting efficiency Can be achieved.

According to the second aspect of the present invention, the throw-away tip is diamond-shaped when viewed from the mounting direction, and has a rake face on a face adjacent to one of the obtuse angles and a face adjacent to the other on the obtuse angle. By providing the rotation direction receiving surface on the right side, the right-hand and left-hand throw-away chips can be shared, and the number of stocks can be reduced.

According to the third aspect, the rotational direction receiving surface of the throw-away tip is at an acute angle to the tip seating surface,
Since the chip mounting portion has a chip mounting seat surface facing the chip seat surface and a chip mounting receiving surface facing the rotational direction receiving surface, the cutting away of the throw-away chip is caused by cutting resistance during cutting. There is an effect that can be prevented.

[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 embodiment.

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

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

FIG. 5 is a vertical sectional side view showing a state where the throw away tip of the embodiment is attached to a tip attaching portion.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Shimada Inside 580 Square, Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Solid Square Toshiba Tungaloy Co., Ltd. (72) Michio Mori 2068 Ooka, Numazu-shi, Shizuoka 3-3 Numazu Office (56) References Reference: Sho-62-32718 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23C 5/12

Claims (3)

(57) [Claims] 1. A throw-away T-slot cutter in which an even number of chip 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 a throw-away chip is mounted on these chip mounting portions. The throw-away tip is composed of a large tip and a small tip, and the large tip and the small tip are arranged one by one in the axial direction of the cutting head in each of the tip mounting portions, and the A throw-away T-slot cutter characterized by alternately arranging large chips and small chips. 2. A pre-Symbol throw-away tip is a diamond-shaped when viewed from the mounting direction, has a surface rake on a surface adjacent to each other with one of the obtuse portion, rotates in a plane adjacent to each other with the other obtuse portion A claim having a direction receiving surface.
2. The throw-away T-slot cutter according to 1. 3. A tip mounting seat surface facing the tip seat surface and the rotation direction receiving surface of the indexable tip are formed at an acute angle with respect to the tip seat surface. 3. The indexable T-slot cutter according to claim 1 or 2, further comprising a chip mounting receiving surface facing the T-slot.