JP2597600Y2 - Rotary tool with shank - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tool with a shank for machining a router.

[0002]

2. Description of the Related Art Conventionally, in a rotary tool with a shank for router processing of woodwork and similar workpieces, there has been developed Japanese Patent Application Laid-Open No. Sho 54-54 for the purpose of finely clearing both intersection lines with the upper and lower surfaces of a cutting surface. No. 119198 and JP-B-59-2
No. 7,287 or Japanese Patent Publication No. 59-27288. 4 is a router tool disclosed in Japanese Patent Application Laid-Open No. 54-119198, and FIG. 5 is a Japanese Patent Publication No. 59-27287 or Japanese Patent Publication No.
No. 27288 router bit, both with a regular cutting edge 101
A, 101B and a reverse cutting edge 102 having a twist angle opposite thereto.
A, 102B, so that a cutting force acts to press inward both intersection lines with the upper and lower surfaces of the cutting surface.

[0003]

The prior art does not sufficiently control the grindstone stroke, the grindstone diameter, and the like during re-polishing as the number of blades, the blade length, and the case where a large twist angle is required in both cases. In addition, there is a problem that re-grinding is difficult because there is a possibility that the cutting blade on the unpolished side may be damaged by a grindstone. Therefore, there is a problem that the discharge is liable to be caused by the pressurization. SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has a main / sub cutting edge and a main / sub flute having a configuration different from the conventional normal / reverse cutting edge and the normal / reverse flute. The object of the present invention is to provide a rotary tool with a shank that combines a main cutting edge and a sub-cutting edge, which has a good chip discharge ability even at the time of drilling, and is easy to regrind. .

[0004]

In order to achieve the above object, a rotary tool with a shank according to the present invention forms at least one set of a main flute and a blade body from a tip side of a cutting area toward a shank side. So that the blade body is split
A sub flute is provided in a direction different from the main flute ,
Main cutting edge along the main flute, along the sub flute
Divides the main cutting edge and does not exist on the extension of the main flute
As described above, the sub-cutting blades are formed at necessary places.

[0005]

[Function] Since the main cutting edge and the sub cutting edge do not cut the upper and lower surfaces of the workpiece during the router processing, a good finished surface without burrs or the like is obtained at the intersection. And because the sub cutting edge is not on the extension of the main flute, there is no other cutting edge on the grinding wheel stroke extension when re-polishing,
There is no danger of damaging the opponent. Further, since the main flute communicates with the entire length of the cutting edge area, chip discharge during drilling is excellent.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment will be described below with reference to the drawings. Embodiment 1 In the router bit of the rotary tool with a shank of FIG.
Is a shank, and a set of the main flute 2 and the blade body is equally divided into three parts and is screwed over the entire cutting blade area, and along a line of intersection with the rake face side outer peripheral surface of the blade body. Thus, a main cutting edge 3 having a predetermined length is formed. Sub flutes 4 are cut in the shank roots of the blade bodies 3a, 3b, 3c with straight grooves inclined in the direction opposite to the main flute with respect to the tool axis, and the side to be the rake face of the sub flute 4 and the blade A sub-cutting edge 5 of a predetermined length is formed, which can cut over a part of the cutting surface of the main cutting edge 3 along a line of intersection with the body outer peripheral surface.

When router machining is performed with the rotary tool with a shank configured as described above, cutting is performed by the main cutting edge 3 and the sub cutting edge 5 so as to press the upper and lower surfaces of the workpiece. Also, at the time of re-grinding, since there is no sub-cutting edge on the main flute extension and the sub-flute is a straight groove, there is no mutual cutting edge on the grinding wheel stroke extension, so re-polishing is easy, and Since the main flute 2 communicates over the entire cutting edge region, the chip discharging ability at the time of drilling is also good. Note that the sub-flute 4 may not be a straight groove if the main cutting edge 3 is not on the extension of the stroke during re-polishing.

Second Embodiment As shown in FIG. 2, a rotary bit of a rotary tool with a shank according to a second embodiment of the present invention has three blades 3a, 3b, 3c in order to reduce cutting resistance in the rotary tool with a shank of the first embodiment. The main and sub cutting edges 3 and 5 are divided into small cutting edges so that a single spiral groove 6 can be cut and the target cutting surface can be divided and cut with one rotation of the three blades (Fig. 2c). It is. Further, in order to increase the blade length of the sub cutting edge 5, a plurality of sub flutes 4 are cut in one blade body, and the same portions as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. . Sub flute 4 as in this embodiment
In the specification having a plurality of grooves, not only the auxiliary cutting edge can be effectively applied to groove processing of various depths, but if the spiral groove 6 is set to a predetermined depth, chips can be stored also in this spiral groove. The thickness of the core can be made thicker than that of the conventional one having the same diameter, the breaking resistance against shank increases, and it can be used for heavy cutting. The spiral groove 6 does not need to be limited to one.

FIG. 3 shows various patterns of sub-flutes formed on various blades. The main flute adjacent to the blades is formed from the tip of the cutting area to the root of the shank. One or more sub-flutes are formed so as to divide the blade body, and sub-cutting blades are provided at necessary places. FIG.
In (c), the blade body is parallel to the tool axis, and the main cutting edge 11 does not exert a cutting force in the direction of pressing or pushing up the cut portion of the workpiece in the router processing, so that a moderate sharpness can be obtained. Can be The cutting force acts on the sub cutting edge 12 in (a) in the direction of pressing the upper surface of the workpiece, and (b)
The cutting force acts on the sub-cutting edge 13 in the direction of pushing up the lower surface of the work, and the cutting force acts on the sub-cutting edges 14 and 15 in the direction of pressing the upper and lower surfaces of the work.

FIGS. 3 (d) to 3 (f) are blades that are inclined upward to the right with respect to the tool axis, and the main cutting blade 16 applies a cutting force so as to push up the lower surface of the workpiece. A cutting force acts on the sub-cutting edge 17 of (d) so as to press the upper surface of the workpiece, and the sub-cutting blade 18 of (e) has no cutting force in the direction of pressing or pushing up the upper surface of the workpiece, and is moderate. The sharpness of is obtained. In (f), a cutting force acts on one of the sub-cutting edges 19 in a direction of pressing the upper surface of the workpiece, and the other sub-cutting edge 20 does not exert a cutting force on any of the upper and lower directions of the workpiece. , A cutting blade for cutting a central portion of a workpiece.

FIGS. 3 (g) to 3 (i) show blades which are inclined downward to the right with respect to the axis of the tool. The main cutting blade 22 exerts a cutting force in a direction to press the upper surface of the workpiece. . (G)
The cutting force acts on the sub-cutting edges 23 and 24 of (h) in the direction of pushing up the lower surface of the workpiece, and the cutting force acts on the one of the sub-cutting edges 26 of (i) in the direction of pushing up the lower surface of the workpiece. However, the other sub-cutting edge 25 is a cutting edge for cutting a central portion of the workpiece without a cutting force acting in any of the upper and lower directions of the workpiece.
In addition, the cutting blade region is not limited to one composed of one type of blade, but may be composed of two or more types of blades.

[0012]

The present invention is configured as described above and has the following effects. Since the main flute is formed over the entire cutting area, the chip discharging ability at the time of drilling is greatly improved. Further, since the cutting is performed so as to be held down by the main and sub cutting blades, the processing quality of the intersection line between the upper and lower surfaces of the workpiece and the cut surface is not impaired. In addition, since the sub cutting edge is provided in the blade body of the main cutting edge, there is no other cutting edge on the grinding wheel stroke extension at the time of re-polishing, and re-polishing becomes easy.

[Brief description of the drawings]

FIG. 1 (a) is a front view of a first embodiment of a rotary tool with a shank, and FIG. 1 (b) is a side view thereof.

2A is a front view of a rotary tool with a shank according to a second embodiment of the present invention, FIG. 2B is a side view thereof, and FIG. 2C is a developed view of a cutting blade.

FIGS. 3A to 3C are diagrams showing various patterns formed by sub-flutes dividing a blade body according to another embodiment; FIGS.
FIGS. 4A to 4F are diagrams of each pattern formed by a sub-flute provided on a blade body parallel to the tool axis, and FIGS. 4D to 4F are formed by a sub-flute provided on a blade body inclined upward to the right with respect to the tool axis. (G) to (f) are diagrams of each pattern formed by the sub-flute provided on the blade body inclined downward to the right with respect to the tool axis.

FIG. 4A is a front view of a conventional router tool.
(B) is a side view thereof.

FIG. 5 is a front view of a prior art router bit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shank 2 Main flute 3, 11, 16, 22 Main cutting edge 4 Secondary flute 5, 12-15, 17-20, 23-26 Secondary cutting edge 6 Spiral groove

Claims (1)

(57) [Scope of request for utility model registration] At least one set of a main flute and a blade body is formed from a tip side of a cutting area toward a shank side, and a different one from the main flute is formed in the blade body so as to divide the blade body.
That direction providing the sub-flute, the main cutting edge along said main flutes, and divide the main cutting edge to the along the sub-flute the main off
A rotary tool with a shank, characterized in that sub-cutting edges are formed at necessary places so as not to be present on the extension of the route .