JP2001157908A - Cutting machine, and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting apparatus to prevent chips, etc., from entering between a tool holder and a tool shank. SOLUTION: This cutting tool in which a tightening portion 200a by a screw or the like of a cutting tool body 12 is disposed in a first recessed portion 200 which is recessed below the contour of the cutting tool body 12, and the tool holder 14 having a second recessed portion 14' to be fitted to the cutting tool with a small clearance between the contour of the cutting tool and itself, are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device and a cutting tool for cutting a general material such as metal or resin using a cutting tool made of a cemented carbide, diamond or the like.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a lathe system and FIG. 4 shows an example of a fly-cut system with respect to the configuration and mounting method of a conventional mounting portion for a cutting tool and a tool holder.

In FIG. 3, reference numeral 1 denotes a workpiece, which is held by a holding / rotating mechanism (not shown) so as to be rotatable around the X axis in the direction of an arrow. A cutting tool shank 2 has a tip 3 on the cutting side to which a chip 3 made of cemented carbide or diamond is fixed by a method such as brazing or screwing.

[0004] Reference numeral 4 denotes a tool holder, which has a recess 4 'in which the tool shank 2 is accommodated. A tool shank 2 is set in the recess 4 ′.
A spacer 5 is set on the upper side. Reference numeral 6 denotes a tightening screw, which is screwed to a female screw formed on the tool holder 4 and presses the tool shank 2 through the spacer 5 to the tool holder 4 in the Z direction in the figure to clamp it. Tool holder 2 also has moving table 7
, And can be moved in the X and Y directions in the figure. The rotating workpiece 1 is cut by using this mechanism.

In FIG. 4, reference numeral 1 denotes a workpiece, and a YZ plane in the figure is a workpiece surface. 2 and 2 'are bite shanks, and tips 3, 3' made of cemented carbide or diamond are attached to the respective cutting-side tips.
These tool shanks 2 and 2 ′ are accommodated in recesses 4 ′ that rotate coaxially with the center axis of the tool holder 4. Spacers 5, 5 'and screws 6, 6' for fixing the tool shanks 2, 2 'in the Z direction and the Y direction in the recess 4' are attached to the recess 4 'of the tool holder 4.

The positions of the bite chips 3 and 3 'in the XY directions are slightly shifted from each other, so that roughing is performed with a bite protruding outward in the Y direction or in the direction of the workpiece, and finishing is performed with the other bite in the Y direction. do.

In FIG. 4, the bite holder 4 has only a rotation mechanism around the X axis, but has a moving mechanism (not shown) in the XY direction on the workpiece 1 side. The workpiece 1 is cut while applying the feed.

[0008]

However, when the workpiece is machined using the above-mentioned conventional apparatus, chips of the workpiece enter the gap between the tool holder and the tool shank, and the chips are formed on the workpiece. May cause damage. In the case of the fly cut method shown in FIG. 4, when chips enter the gap between the tool holder and the tool shank,
As a result, the rotation balance of the tool holder is lost,
In particular, there has been a problem in that rotational vibration occurs during high-speed rotation, and processing accuracy deteriorates.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cutting apparatus and a cutting tool for preventing chips and the like from entering between a tool holder and a tool shank. It is to be.

[0010]

Means for Solving the Problems To solve the above-mentioned problems,
In order to achieve the object, the cutting apparatus according to the present invention includes a cutting portion for tightening a cutting tool body with a screw or the like,
A cutting tool disposed in a first recess recessed from the outer shape of the cutting tool body, and a second holder fitted with a second recess fitted with a slight gap with the outer shape of the cutting tool. Are provided.

Further, in the cutting apparatus according to the present invention, the depth of the first concave portion is set to be larger than the amount of deformation of the cutting tool body by tightening with a screw or the like.

Further, in the cutting apparatus according to the present invention, the cutting tool main body is characterized in that a groove deeper than the first concave portion is formed outside the first concave portion.

Further, the cutting bit according to the present invention is characterized in that a portion of the cutting bit body tightened by a screw or the like is arranged in a concave portion which is depressed from the outer shape of the cutting bit body.

Further, in the cutting tool according to the present invention, the depth of the concave portion is set to be larger than the deformation amount of the cutting tool body by tightening with a screw or the like.

Further, in the cutting tool according to the present invention, the cutting tool body is characterized in that a groove deeper than the recess is formed outside the recess.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to a lathe system, and FIG. 2 is a diagram showing an embodiment in which the present invention is applied to a fly-cut system. In this embodiment, since there are many portions common to the conventional example shown in FIGS. 3 and 4, the same portions are denoted by the same reference numerals and description thereof is omitted.

FIGS. 1 and 2 differ from the prior art shown in FIGS. 3 and 4 in that the spacer 5 is not provided, the shape of the bite shank is different, and there is almost no gap between the bite holder 14 and the bite shank 12. There is no configuration.

In the conventional example, the reason why the tool shank 2 is screwed via the spacer 5 is that if the tool shank 2 is screwed directly, the tool shank is deformed and an error occurs in the mounting posture of the tool shank 2. This is to try to prevent. In the present embodiment, by making the shape of the bite shank 12 different from the conventional example, even if the bite shank 12 is directly screwed, the external dimensions of the bite shank 12 are not deformed. This eliminates the need for a gap for disposing a spacer between the tool holder and the tool shank, and can prevent chips and the like from entering the gap.
Further, since the outer diameter of the bite shank 12 does not change, no error occurs in the mounting posture of the bite shank.

Specifically, as shown in FIGS. 1 and 2, the tool shank 12 is
A groove 200 having a depth equal to or greater than the amount of deformation due to the tightening of the screw is formed in a portion in contact with 6 ′. Therefore, when the screw is tightened, the contact surface 20 of the bite shank 12 with the screw is removed.
Even if deformation such as swelling due to screw tightening occurs at 0 a (the bottom surface of the groove 200), the deformed portion does not protrude from the external shape of the bite shank 12. As a result, the deformed portion becomes the concave portion 14 ′ of the bite holder 14.
Prevents the tool shank 12 from being inserted into the recess 14 ′.
The gap between 4 'and the tool shank 12 can be made very small. (Other Embodiment) The example shown in FIG.
A groove 202 is further provided outside the contact groove 200 for the screw 6. The deformation of the external shape of the bite shank 22 is further suppressed as compared with the case of the single-step groove having only the groove 200, and the gap between the bite holder and the bite shank can be further reduced. Is effective.

As described above, since the deformation of the external shape of the bite shank is suppressed by providing the groove in the tightening screw portion of the bite shank, the bite shank and the bite holder should be in a fitted state with almost no gap. It is possible to perform processing without the attachment of cutting waste to the tool holder. As a result, there is no damage from chips,
Also, high-precision cutting without rotational imbalance can be performed.

[0022]

As described above, according to the present invention,
Chips and the like can be prevented from entering between the tool holder and the tool shank.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to a lathe system.

FIG. 2 is a diagram showing an embodiment in which the present invention is applied to a fly-cut method.

FIG. 3 is a schematic view of a conventional cutting tool and a tool holder.

FIG. 4 is a schematic view of a conventional cutting tool and a tool holder.

FIG. 5 is a view showing another embodiment of a cutting tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Workpiece 2 Byte shank 3 Byte tip 4 Byte holder 200, 202 Groove 12 Byte shank 14 Byte holder

Claims (6)

[Claims] 1. A cutting tool in which a tightening portion of a cutting tool body by a screw or the like is disposed in a first recess recessed from an outer shape of the cutting tool body. A cutting tool having a second concave portion fitted with a large gap. 2. The cutting apparatus according to claim 1, wherein a depth of the first concave portion is set to be larger than a deformation amount of the cutting tool main body by tightening with a screw or the like. 3. The cutting apparatus according to claim 1, wherein a groove deeper than the first recess is formed in the cutting tool body outside the first recess. 4. A cutting tool according to claim 1, wherein a portion of the cutting tool body tightened by a screw or the like is arranged in a concave portion recessed from the outer shape of the cutting tool body. 5. The cutting bit according to claim 4, wherein the depth of the concave portion is set to be larger than the deformation amount of the cutting bit body by tightening with a screw or the like. 6. The cutting tool according to claim 4, wherein a groove deeper than the recess is formed in the cutting tool body outside the recess.