JP2000107923A - Throw away type side cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the rigidity of the whole tool body and prevent the deflection or chatter vibration by radially burying, on the circular side surface of one side or both sides of the tool body, a reinforcing member consisting of a bar-like cemented carbide at circumferentially equal intervals over the radial direction. SOLUTION: A bar-like carbide reinforcing material 6 having a rectangular section is buried over the direction of from the center part of the tool body 1 to the circumference of the tool body 1, or the radial direction, and fixed by brazing. The outside surface of the carbide reinforcing material 6 is slightly recessed from the circular side surface of the tool body 1, so that it never interferes with a groove inner wall during machining. The reason of setting the material of the reinforcing material 6 to cemented carbide is that the equivalent sectional area obtained by substituting the cemented carbide by the sectional area of steel is large since the elasticity coefficient ratio of cemented carbide to steel is about 3 times, and the effect of improving the bending rigidity is thus large.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to various steel materials, cast iron,
The present invention relates to a throw-away type side cutter applied to grooving or cutting of an aluminum alloy or the like.

[0002]

2. Description of the Related Art Rotary tools for performing grooving and cutting, such as a throw-away type side cutter in which a tool body and a cutting edge are detachably exchangeable, and an integrated body of a tool body and a cutting edge. Many metal saws have a large diameter and a thin shape, which may cause a problem in terms of rigidity. Various improvements have hitherto been made to compensate for the lack of rigidity. For example, a tool body made entirely of a hard material such as a cemented carbide, a throw-away tip (hereinafter, "tip")
That. ) Is known in which the clamping method is a tightening screw method.

[0003] Here, as an example of improved rotary tools, an actual open flat 5-12027 is shown in Figs. 5 and 6.

A tip 23 is mounted on a tip mounting seat 22 formed on an outer peripheral surface of a tool body 21 made of a disk-shaped steel material or the like. The tip 23 is a square flat plate made of a cemented carbide or the like, and has a cutting edge formed at the intersection ridge line between the upper and lower surfaces and the outer peripheral side surface. At the center of the upper and lower surfaces of the chip 23, a mounting hole 24 for fixing the chip 23 to the chip mounting seat 22 is formed.

[0005] The chip mounting seat 2 on which the chip 23 is seated.
2 is formed in a concave groove shape so that the upper and lower surfaces of the chip 23 can be mounted in the radial direction of the tool main body 21. A screw hole is screwed to match the hole 24.
Such tip mounting seats 22 are arranged in a staggered manner at equal intervals in the circumferential direction of the outer peripheral surface of the tool body 21.

The chip 23 is placed on the chip mounting seat 22, a tightening screw is inserted into the mounting hole, and the tightening screw is screwed into the screw hole of the chip mounting seat 22, so that the chip 23 is mounted. It is directly fixed in a state where the thickness direction faces the radial direction of the tool body 21.

[0007]

Here, the problems of the prior art will be described below.

In the prior art, the rigidity of the tool body 21 is increased by devising and improving the arrangement of the tips 23 and the clamping method.

In other words, conventionally, since the tip 23 is mounted so that the thickness direction of the tip 23 coincides with the circumferential direction of the tool body 21, the radially inward recess of the tool body 21 becomes deep, and the rigidity of the tool body 21 is increased. Has been reduced. Further, in the method of fixing the tip 23 by the wedge method, it is necessary to form a groove for inserting the wedge member inside the tool body 21 in the radial direction, which also causes a reduction in rigidity.
Further, the wedge method has a problem that the tool body 21 is deformed by a wedge effect for fixing the tip 23. In order to improve the rigidity, the prior art employs a method in which the thickness direction of the tip 23 is arranged so as to coincide with the radial direction of the tool body 21, and a fixing method using a tightening screw is employed.

However, the above-mentioned prior art is effective in suppressing deformation of the outer peripheral portion of the tool main body 21, but is difficult when machining difficult-to-machine materials such as stainless steel, or when the cutting depth is large and the feed rate is small. When processing is performed under a high amount of conditions, the cutting resistance increases, and bending and chatter vibration may occur. This is due to the deformation of the tool body 21 as a whole.

In view of the above, the present invention improves the rigidity of the tool body 21 as a whole, so that it can be used for stainless steel and other difficult-to-machine materials and heavy cutting without any problem.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a flat throw-away tip is provided on a tip mounting seat recessed on an outer peripheral surface of a disk-shaped tool body. In the detachable side cutter which is detachably mounted, a reinforcing member made of a cemented carbide rod-shaped body is provided on one or both circular side surfaces of the tool body at equal intervals in the circumferential direction and radially. It is characterized by being buried radially.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The throw-away type side cutter (hereinafter referred to as "side cutter") of the present invention is clearly shown in FIGS. A parallelogram-shaped flat chip 2 is mounted on the outer peripheral surface 4 of the disk-shaped tool body 1 in a staggered manner, and a reinforcing member made of cemented carbide (hereinafter referred to as “ultra Hard reinforcement material.) 6 is radially embedded in the radial direction.

FIG. 1 is a view of a main part of a side cutter viewed from one side surface. The tool body 1 rotates in the direction of the arrow C, and machining is performed. On the outer periphery of the tool body 1, a plurality of chip mounting seats 3 are provided at regular intervals in the circumferential direction. A chip discharge groove 7 is provided at the front of the chip mounting seat 3 in the rotation direction, and a floor plate 8 is provided at the rear of the chip mounting seat 3 in the rotation direction. The chip discharge groove 7 is for smoothly discharging the chips generated during the processing and the chips accumulated in the processing groove due to the loss of the escape space. This is because, if machining is continued in a state where chips are accumulated in the groove, the chip 2 may be broken or the tool body 1 may be deformed due to a sharp increase in cutting resistance.

The floor plate 8 is fixed with a tightening screw with its thickness direction directed in the radial direction of the tool body 1. This floor plate 8 prevents deformation and damage of the tool body 1,
It has a role of preventing chip 2 from being lost.

On the circular side surface 5 of the tool body 1, the tool body 1
A rod-shaped carbide reinforcing material 6 having a rectangular cross section is buried in a direction from the center to the outer periphery of the tool body 1, that is, in the radial direction, and is fixed by brazing. At this time, the outer surface of the cemented carbide reinforcing material 6 is slightly recessed from the circular side surface of the tool body 1 so that care is taken not to interfere with the inner wall of the groove during machining. The reason why the material of the reinforcing member is a cemented carbide is that the equivalent sectional area obtained by replacing the cemented carbide with the sectional area of steel is large because the elastic modulus ratio between the cemented carbide and steel is about three times. This is because the effect of improving the bending rigidity is great. This cemented carbide reinforcement 6 has a cutting component force (hereinafter, referred to as a cutting force) generated in the tool rotation direction.
It is called "cutting main component force". ), Which is effective against bending due to a cutting component force (hereinafter, referred to as “cut feed component force”) generated in the axial direction of the tool body 1.

The flexural rigidity is improved in proportion to the volume of the cemented carbide reinforcing material 6, but when the cemented carbide reinforcing material 6 is increased, the tool cost becomes expensive and the weight of the tool body 1 becomes heavy. This causes adverse effects such as imposing a burden on the machine tool.

Therefore, the present invention specifies the arrangement, cross-sectional shape and length of the cemented carbide reinforcing material 6 in consideration of the bending and chattering properties of the tool body 1, and determines the cost of the cemented carbide. The use amount is reduced and the effect of improving the bending rigidity is achieved.

Here, the arrangement of the cemented carbide reinforcing material 6 is as follows.
Due to the balance of the rotating body and the nature of the bending of the beam, the cemented carbide reinforcements 6 are arranged at equal intervals in the circumferential direction, and at the same time, radially extend from the inner peripheral side to the outer peripheral side of the circular side surface. Have been placed.

The cross-sectional shape of the cemented carbide reinforcing material 6 is a shallow and wide rectangular shape in consideration of the property of the second moment of area.

The longer the length of the cemented carbide reinforcing material, the higher the bending rigidity. However, the length is set to a predetermined length in consideration of cost and performance. In the bending test of the cantilever, it has been found that the effect is effective at about 50 to 60% of the protruding length.

FIGS. 2 and 3 are cross-sectional views showing a state in which the cemented carbide reinforcing material 6 is embedded. The cemented carbide reinforcing material 6 is embedded in the circular side surfaces 5 on both sides at a predetermined depth and length. The cemented carbide reinforcement 6 embedded in the circular side surface 5 on the spindle end side of the machine tool,
The length is shortened because it is inconvenient to embed the cemented carbide reinforcing material 6 at the root. However, this does not degrade tool performance.

As described above, those having the cemented carbide reinforcing members 6 on both sides of the circular side surface 5 are excellent in rotational balance at the time of high-speed rotation, and are particularly suitable for high-speed machining.

It should be noted that the effect of improving the bending stiffness has been recognized even with a material having a cemented carbide reinforcing material only on one of the circular side surfaces 5.

FIG. 4 is a view of the side cutter as viewed from above the outer peripheral surface 4. The chip 2 whose upper and lower surfaces are parallelogram-shaped
A predetermined axial rake is mounted such that its sharp corners alternately protrude outward from the circular side surfaces 5 on both sides.
It has a so-called staggered cutting edge configuration.

The reason why the parallelogram-shaped chip 2 is used is to reduce cutting resistance and improve biting. Since difficult-to-machine materials such as stainless steel easily increase the cutting resistance, the tip 2 of the present invention is particularly suitable for such a machined material.

The staggered cutting edge configuration is adopted because the cutting action of the cutting edge of the insert 2 is alternately involved in the inner wall of the processing groove, so that a well-balanced and smooth processing is performed. In addition, this is also preferable in avoiding deformation of the tool main body 1.

The tip 2 has its upper and lower surfaces directed in the radial direction of the tool body 1, that is, the thickness direction directed in the radial direction. And is directly attached to the tool body 1. The reason why the thickness direction of the tip 2 is oriented in the radial direction is that, as described in the section of the prior art, when the thickness direction of the tip 2 is mounted in the outer peripheral direction, the recessed portion of the tool body 1 inward in the radial direction is provided. This is because the groove becomes deep and the rigidity of the outer peripheral portion of the tool body 1 is reduced.

This arrangement is preferable in preventing chip breakage, since the main component force of the cutting acts in the longitudinal direction of the chip.

[0031]

According to the present invention, the rigidity of the entire tool body is increased, and the occurrence of bending and chatter vibration can be prevented, so that cutting can be performed smoothly and efficiently. Also, conventionally,
The thickness of the tool body can be reduced, and machining with high machining accuracy can be performed.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of an embodiment of a side cutter according to the present invention.

FIG. 2 is a sectional view taken along line AA shown in FIG.

FIG. 3 is a sectional view taken along the line BB shown in FIG. 1;

FIG. 4 is a side view in the X direction of FIG. 1;

FIG. 5 is a front view showing an example of the related art.

FIG. 6 is a side view as viewed in the Y direction of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool main body 2 Tip 3 Tip mounting seat 4 Outer peripheral surface 5 Circular side surface 6 Reinforcement member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuyuki Uno 580 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Solid Square Toshiba Tungaloy Co., Ltd. F-term (reference) 3C022 JJ01

Claims (1)

[Claims] 1. A throw-away type side cutter in which a plate-like throw-away tip is removably mounted on a tip mounting seat 3 which is recessed on an outer peripheral surface of a tool body 1 having a disc shape. A reinforcing member 6 made of a cemented carbide rod is embedded radially in the radial direction at equal intervals in the circumferential direction on one or both sides of the circular side surface 5. Side cutter.