JPH09192917A - Chamfering rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reuse a tip of a face milling cutter with a throw-away tip, a bite with a throw-away tip or the like without subjecting to the tip to machining. SOLUTION: A tip attaching part 2 provided to the front end of a shank part 1, is secured thereto with a throw-away tip for a face milling cutter so that cutting edges are located symmetrically about a center C1 which is offset from the center C of the shank part. Since the intermediate parts of the cutting edges are not used, and accordingly, these intermediate parts of the cutting edges are not used, and accordingly, these intermediate parts are used for chamfering, V-grooving or the like. Due to recycling, no machining is made, and accordingly, it is extremely economical.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rotary tool mainly used as a chamfering tool.

[0002]

DISCLOSURE OF THE INVENTION The present invention is a development of the conventional technology described below, and provides a rotating tool for chamfering which is excellent in economic efficiency and which can use a used tip without any modification. The purpose is to do.

[0003]

A first aspect of the present invention is a cylindrical or tapered shank portion having a center coinciding with the center of a rotary spindle of a metal machine tool, and a tip attached to and detached from the tip of the shank portion. And a tip mounting portion of a quadrangle or a triangle, which can be provided, wherein the tip mounting portion has a cutting edge obliquely arranged such that the tip side of the cutting edge of the tip approaches the center line of the shank portion, and the tip is Side is located closer to the shank center line and the axis of symmetry of the cutting edge is offset from the center line of the shank part, and the means for fixing the chip to the chip mounting part is provided to further use the used throwaway tip without recycling. It is a chamfering rotary tool characterized in that it is possible.

A second aspect of the present invention is the chamfering rotary tool according to the first aspect, wherein the square tip is a throwaway tip having a positive reiki for face milling.

A third aspect of the present invention is the chamfering rotary tool according to the second aspect, wherein the square tip is a used tip as a face milling cutter.

A fourth aspect of the present invention is a cylindrical or tapered shank portion 1 and a tip mounting portion 2 at the tip of the shank portion 1.
And a tip retainer 3 and a tip retainer fastening means 8, and the tip attachment portion 2 has a shank tip side portion passing through a shank center line C and having a tapered conical surface. 4a and a conical body 4 having a receding conical surface 4b on the taper side of the original conical surface 4a, which is slightly retracted from the conical surface 4a of the original side. A symmetry center line C having a seat surface 5 and having a symmetry center line C1 which is substantially parallel to the tip pressing seat surface 5 as viewed from above and which is substantially parallel to the shank portion center line C.
Right-angled paragraph 6 having apex of corner on 1 and opening toward the tip
Therefore, the rotary tool for chamfering is characterized in that the chip seat 7 is provided and the chip T placed on the chip seat 7 can be fixed by the chip presser 3 and the chip presser fastening means 8.

In a fifth aspect of the present invention, the tip pressing fastening means 8 is formed by engraving the tip pressing surface 5 with a screw 9, a bolt hole 11 provided in the tip pressing 3, and a bolt hole 11 inserted therein. It is a chamfering rotary tool having a clamp bolt 18 screwed into a screw 9.

[0008]

2. Description of the Related Art Conventionally, as a chamfering cutter, a milling cutter made of high speed steel or a cemented carbide tool brazed to a shank has been used.

On the other hand, it is mainly one corner part of a square insert that is used for cutting a face mill equipped with a throwaway insert, and the remaining degree of use is extremely low, and even when all four sides are used. Most of them are not reused as scrap, although some parts are recycled as downsize with the middle part of the four sides excluding the edge of the cutting edge being as new. Even in the case of this down size, the new yen can be purchased cheaper than the recycled product due to the recent strong yen and the price collapse. The same applies to the triangular chip used for the cutting tool. The materials for these chips are ceramics, sarttes and cemented carbides.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the tip holder body A. The tip holder body A has a shank portion 1 and a tip mounting portion 2. In the figure, the shank portion 1 has a cylindrical shape or a taper, and its center line C is attached to the machine tool so as to coincide with the center of a rotary spindle of the machine tool (not shown). Machine tools include milling machines, drilling machines, lathes and the like.

The tip mounting portion 2 is provided on the tip side of the shank portion 1 as shown in FIGS. 1 and 2 of the side view of FIG.
The tip mounting portion 2 has a base conical surface 4a having a shank tip portion side that passes through the shank center line C, and a base conical surface 4a.
It has a tip pressing surface 5 which is slightly retracted from a and has a conical surface body 4 having a receding conical surface 4b on the taper side of the original conical surface 4a, which is machined substantially along the shank center line C. The original conical surface 4a and the retracted conical surface 4b both have a conical angle of 90 degrees. When viewed in a plane, the tip pressing surface 5 has an apex 13 of a corner angle on the symmetry center line C1 with a symmetry center line C1 which is close to and parallel to the shank portion center line C as a symmetry axis, and faces the tip. The tip seat 7 is abraded by the right-angled paragraph 6 that opens. When the chip seat 7 is cut, a drill hole 14 slightly deeper than the right-angled paragraph 6 is provided around the apex 13.

On the tip mounting portion 2 of the tip holder main body A, a female screw 9 is provided so as to penetrate the tip pressing surface 5 as a part of a fastening means 8 for a tip pressing 3 which will be described later.

The positions of the female threads 9 are provided symmetrically close to the center line C of the shank portion, and the number of the female threads 9 is two.

The tip holder 3 has a flat pressing surface 15 for the portion for pressing and abutting the tip T (see FIG. 6) to be seated on the tip seat 7 and the portion for pressing and abutting on the tip pressing surface 5. It has a substantially semi-cylindrical shape and a peripheral surface 16 having the same diameter as the shank portion 1 in the assembled state. This peripheral surface 16
On the tip side of the shank portion 1 is the conical surface 4 on the original side of the tip portion.
The original conical surface 4a1 is provided so as to have the same conical surface in the assembled state as a, and the front end portion is an end surface 17 perpendicular to the center line C. The end surface 17 does not reach the receding conical surface 4b in the axial direction.

The tip retainer 3 is provided with a hexagon socket head bolt hole 11 corresponding to the screw 9 to be provided on the tip seat 7 as a part of the tip retainer fastening means 8.

In the above description, the right-angled paragraph 6 has a height smaller than the thickness of the chip T by the tolerance.

A chamfer 1a is provided at the rear end of the shank portion 1.
In addition to chamfering, each part is chamfered if necessary.

Next, the relationship between the tip T and the tip seat 7 will be described in an assembled state.

The tip T is seated on the tip seat 7, and the tip retainer 3 is brought into contact with the tip retainer surface 5 against the pressing surface 15 thereof, and the tip T is also brought into contact with the retainer surface 15 so that the tip retainer 3 has a hexagonal hole. The hexagon socket head cap screw 18 is fastened to the female screw 9 of the tip seat 7 by inserting it through the bolt hole 11. Then, as shown in FIGS. 6, 7, and 8, the tip T is fixed to the tip holder body A using the tip holder 3.

Here, the tip T is a throwaway tip that can be attached to and detached from the face mill and has a position brake angle. As shown in FIG. 6, this chip has a quadrangular shape, and four corners on the rake face TO side of the upper surface are cutting edges T1 and each corner T2 is deleted. The vicinity of the corner T2 is a portion that performs a cutting action as a face mill, but the middle portion of each cutting edge T1 is not used. Therefore, the chip used in the face milling cutter is used as an example. However, using a new chip can be adopted without any problem.

As shown in FIG. 9, which is an exaggerated section taken along the line AA of FIG. 6 so that the rake face T0 has the position brake angle α in the assembled state, the center of symmetry C1 and the cutting edge T are shown.
In order to obtain the angle between the line connecting 1 and the rake face T0, the rake face T0 is made slightly higher than the tip pressing face 5 by Δt, and the rake face T0 passes through the center line C1 of the symmetric portion parallel to the paper surface of FIG. The position is parallel to the plane.

Further, as for the mounting posture of the tip T, the tip side of the tip T (corner T2 protruding from the tip mounting portion 2)
7) may be considered as the first downlink.

When the above-described tip T is attached, the front flank T3 against the rear two side cutting edges T1 comes into contact with the paragraph 6 of the tip mounting portion 2 so that the front flanks of the front two side cutting edges T1. The lower edge portion T5 of T3 coincides with the extension conical surface from the receding conical surface 4b or is located outside the extension conical surface,
It is also inside the original conical surface 4a. Here, the effective cutting edge T1e shown in FIG. 6 has a length L from the corner T2 to the start of the original conical surface 4a. In this example, this length L is made equal to the length of the cutting edge T1 of the tip T.

Although the above embodiments have been described with respect to the rectangular chip, the triangular chip is similarly realized by replacing the bisector position of the triangle with the diagonal position of the square chip, and By disposing the triangular tip apex side on the shank portion side on the tip side, the same chip mounting state is obtained. Such triangular inserts are turned,
It is used as a tool for planing, etc., but since the middle part of the cutting blade is usually used without being used, such a triangular tip can be effectively used without recycling.

[0026]

[Effects of the Invention] The throwaway tip of the used face mill can be used without any processing on the tip. Since no processing is applied to the used chips, it is also possible to use a new throwaway insert for face milling, so not only can the used chips be used effectively without the recycling process, but new chips can also be used. Flexible. Since the material of the chip is ceramic, cermet, or cemented carbide, sharpness and surface roughness can be improved for a long time compared to the conventional ones. Since the chip mounting part of the holder is misaligned, one square chip can be used on four sides. The tip can be used not only for 45 degree C (square) chamfering but also for guide processing such as V groove fitting. At the NC milling machining center (MC), tool management is easy and cutting speed can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a chamfering rotary tool of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a side view of the tip retainer.

FIG. 5 is a front view of a tip holder.

FIG. 6 is a plan view of an embodiment of the chamfering rotary tool of the present invention in an assembled state.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a front view of FIG. 7;

9 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shank part 1a ... Chamfering 2 ... Tip mounting part 3 ... Tip pressing part 4 ... Conical surface body 4a ... Original conical surface 4a1 ... Original conical surface 4b ... Receding conical surface 5 ... Tip pressing surface 6 ... Right angled paragraph part 7 ... Tip seat 8 ... Fastening means 9 ... Female screw 11 ... Hexagon socket head bolt hole 13 ... Corner apex 14 ... Drill hole 15 ... Pressing surface 16 ... Peripheral surface 17 ... End surface 18 ... Hexagon socket head bolt A ... Tip holder body C … Center line C1… Symmetric center line L… Length T… Chip T0… Scooping surface T1… Cutting edge T1e… Effective cutting edge T2… Corner T3… Flanking surface T5… Edge part α… Position brake angle

Claims (5)

[Claims] 1. A cylindrical or tapered shank portion having a center coinciding with a center of a main spindle of a metal machine tool, and a rectangular or triangular tip mounting portion having a tip removably attached to the tip of the shank portion. And the tip mounting portion has a cutting edge obliquely arranged so that the tip side of the tip of the tip approaches the center line of the shank portion, and the tip side is symmetrical with respect to the center line of the shank at the tip side. A rotary tool for chamfering, characterized in that the shaft is provided at a position offset from the center line of the shank portion, and means for fixing the tip to the tip mounting portion is provided, so that the used throwaway tip can be further used without recycling. . 2. The square chip is a throwaway chip with positive reiki for face milling.
Rotary tool for chamfering described in. 3. The chamfering rotary tool according to claim 2, wherein the square tip is a used tip as a face milling cutter. 4. A shank body A having a cylindrical or tapered shank portion 1, a tip mounting portion 2 at the tip of the shank portion 1, a tip retainer 3, and a tip retainer fastening means 8, the tip comprising: The mounting portion 2 is located in the original conical surface 4a having the shank tip portion side passing through the center line C of the shank portion and slightly retracted from the original conical surface 4a, and the retracted cone on the tapered side of the original conical surface 4a. A conical body 4 having a surface 4b is machined along the center line C of the shank portion, and has a tip pressing seat surface 5. When viewed from a plane, the tip pressing seat surface 5 approaches the shank portion center line C. Then, the chip seat 7 is provided with the right angled paragraph 6 having the apex of the corner on the symmetry center line C1 and having the apex of the corner on the symmetry center line C1 and opening toward the tip, and the chip seat 7 is mounted on the chip seat 7. Insert the tip T into the tip retainer 3 and the tip retainer fastening means. A chamfering rotary tool characterized in that it can be fixed by 8. 5. The tip retainer fastening means 8 is a screw 9 for engraving the tip retainer surface 5, a bolt hole 11 provided in the tip retainer 3, and a clamp bolt which is inserted into the bolt hole 11 and screwed into the female screw 9. A rotary tool for chamfering having 18.