JPH0664805U - Rotary tool with shank - Google Patents

Abstract

(57) [Abstract] [Purpose] A rotary tool with a shank for woodworking and similar workpieces that combines a main cutting edge and a sub-cutting edge with good chip discharge ability even during drilling and easy re-grinding. I will provide a. A main cutting edge 3 is formed by a main flute 2 over the entire cutting edge area, and a sub cutting edge 5 is formed by a sub flute 4 of a linear groove cut to divide the blade body of the main cutting edge. Has been done. Then, the main cutting edge and the sub cutting edge perform router processing so as to press both upper and lower surface portions of the workpiece. Since there is no sub cutting edge on the extension of the main flute at the time of re-polishing and the sub flute is a straight groove, there is no mutual cutting edge on the extension of the grindstone stroke, so polishing is easy and the main flute at the time of cutting Since it runs all over the cutting area, it has a good chip discharge capability even during drilling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary tool with a shank for processing a router.

[0002]

[Prior art]

 Conventionally, in a rotary tool with a shank for router processing of woodworking and similar workpieces, it was developed for the purpose of neatly finishing both intersecting lines with the upper and lower surfaces of the cutting surface. There is a known technique in Japanese Patent Publication No. 59-27287 or Japanese Patent Publication No. 59-27288. FIG. 4 is a router tool disclosed in JP-A-54-119198, and FIG. 5 is a router bit disclosed in JP-B-59-27287 or JP-B-59-27288, both of which have normal cutting edges 101A and 101B and a twist angle. Has opposite cutting edges 102A and 102B, and the cutting force acts so as to press inward both intersecting lines with the upper and lower surfaces of the cutting surface.

[0003]

[Problems to be solved by the device]

 Both of the conventional techniques have a large number of blades, a long blade length, and a large twist angle, and unless the grindstone stroke, grindstone diameter, etc. are properly controlled during re-polishing, the cutting on the unpolished side is performed. There is a problem that it is difficult to re-polish the blade because it may be damaged by the grindstone.In addition, chips that are to be rolled up and discharged by the normal flute in the punching process are pressed by the reverse flute, resulting in defective discharge. There are problems such as easy to get. The present invention has been made in view of such problems of the conventional technology, and has a main / sub cutting edge and a main / sub cutting edge having a configuration different from that of the conventional forward / reverse cutting edge and the forward / reverse flute. The purpose is to provide a rotary tool with a shank that combines a main cutting edge and a sub cutting edge, which has flutes and has a good chip discharge capacity even during drilling and is easy to re-grind. is there.

[0004]

Means for Solving the Problems To achieve the above object, a shank-equipped rotary tool according to the present invention comprises at least one set of a main flute and a blade formed from a tip side of a cutting region toward a shank side, A sub-flute is provided so as to divide the blade body, and a main cutting edge is formed along the main flute and a sub-cutting edge is formed along the sub-flute at required positions.

[0005]

[Action]

 The main cutting edge and the sub cutting edge do not cut the upper and lower surfaces of the workpiece during router processing, so a good finished surface with no burrs at the intersection is obtained. Since the secondary cutting edge is not on the extension of the main flute, there is no mutual cutting edge on the extension of the grindstone stroke during re-polishing, and there is no risk of damaging the other edge. Also, since the main flute runs over the entire length of the cutting edge area, chips are discharged well during drilling.

[0006]

【Example】

 The present embodiment will be described below with reference to the drawings. Example 1 In the router bit of the rotary tool with shank of FIG. 1, 1 is a shank, and the set of the main flute 2 and the blade body equally divides the circumference over the entire cutting edge region, and three sets are screwed. The main cutting edge 3 having a predetermined blade length is formed along the line of intersection with the rake face side outer peripheral surface of the blade body. The auxiliary flute 4 is cut in the shank root of the blades 3a, 3b, 3c by a straight groove inclined in the direction opposite to the main flute with respect to the tool axis. A sub-cutting blade 5 of a predetermined length is formed that can be cut across a part of the cutting surface of the main cutting blade 3 along a line of intersection with the outer peripheral surface of the blade body.

When router processing is performed using the shank-equipped rotary tool configured as described above, cutting is performed by the main cutting edge 3 and the sub cutting edge 5 so as to press both upper and lower surfaces of the workpiece. In addition, during re-polishing, there is no sub-cutting edge on the main flute extension and the sub-flute is a straight groove, so there is no mutual cutting edge on the grindstone stroke extension, so re-polishing is easy, Further, since the main flute 2 communicates with the entire cutting edge region, the chip discharging capability at the time of drilling is also good. Incidentally, the sub-flute 4 does not have to be a straight groove unless the main cutting edge 3 is provided on the stroke extension during re-polishing.

Embodiment 2 As shown in FIG. 2, the router bit of the shank-equipped rotary tool of the present embodiment has three blades 3 a, 3 b, 3 c for reducing the cutting resistance in the shank-equipped rotary tool of Embodiment 1. A spiral groove 6 consisting of a single line is cut, and the main and sub cutting edges 3 and 5 are divided into small cutting edges so that the target cutting surface can be divided and cut with one rotation of the three blades (Fig. 2c). It was done. Further, in order to increase the blade length of the auxiliary cutting blade 5, a plurality of auxiliary flutes 4 are cut in one blade body, and the same portions as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. To do. In the specification in which a plurality of sub-flutes 4 are provided as in the present embodiment, the sub-cutting edge can easily work effectively even for groove machining of various depths, and if the spiral groove 6 is set to a predetermined depth, Chips can also be stored in the spiral groove, the core thickness can be made thicker than that of the conventional one with the same diameter, and the shank resistance against breakage can be increased for heavy cutting. The spiral groove 6 need not be limited to one line.

Other Embodiments FIG. 3 shows various patterns of auxiliary flutes formed on various blades. In each case, the main flute adjacent to the blade is formed from the tip of the cutting region to the shank base, One or more auxiliary flutes are formed so as to divide the blade body, and auxiliary cutting edges are provided at necessary locations. In all of FIGS. 3 (a) to 3 (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 cutting portion of the workpiece during router processing. , You can get a reasonable sharpness. The cutting force acts on the sub cutting edge 12 of (a) in a direction to press the upper surface of the workpiece, and the cutting force acts on the sub cutting edge 13 of (b) to push the lower surface of the workpiece, The sub-cutting edges 14 and 15 in (c) exert a cutting force in a direction in which the upper and lower surfaces of the workpiece are pressed down.

3 (d) to 3 (f) each show a blade body that inclines to the right with respect to the tool axis, and the main cutting edge 16 exerts a cutting force so as to push up the lower surface of the workpiece. The 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 edge 18 of (e) has no cutting force in the direction of pressing or pushing up the upper surface of the workpiece. A moderate sharpness can be obtained. (F) One of the sub cutting edges 19 exerts a cutting force in a direction to press the upper surface of the work piece, and the other sub cutting edge 20 does not exert a cutting force in any of the upper and lower directions of the work piece. , A cutting edge for cutting the central part of the work piece.

3 (g) to 3 (i) each show a blade body that is inclined downward to the right with respect to the tool axis, and the main cutting edge 22 exerts a cutting force in a direction of pressing the upper surface of the workpiece. . A cutting force acts on the sub cutting edges 23 and 24 of (g) and (h) in a direction to push up the lower surface of the work piece, and one sub cutting edge 26 of (i) cuts in a direction to push up the bottom surface of the work piece. A force acts, and the other sub-cutting edge 25 is a cutting edge that cuts the center part of the work piece without a cutting force acting in either the upper or lower direction of the work piece. It should be noted that the cutting edge region is not limited to being configured by one type of blade body, and may be configured by two or more types of blade bodies.

[0012]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. Since the main flute is formed over the entire cutting area, the ability to eject chips during drilling is greatly improved. In addition, since the cutting is performed while being held down by the main and sub cutting edges, there is no loss of processing quality at the intersection of the upper and lower surfaces of the work piece and the cutting surface. Further, since the auxiliary cutting blade is provided in the blade body of the main cutting blade, the other cutting edges do not exist on the grindstone stroke extension during re-polishing, which facilitates re-polishing.

[Brief description of drawings]

FIG. 1A is a front view of a rotary tool with a shank according to a first embodiment, and FIG. 1B is a side view thereof.

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

FIGS. 3A to 3C are diagrams showing various patterns formed by a sub-flute that divides a blade according to another embodiment, and FIGS.
Is a diagram of each pattern formed by the sub-flute provided on the blade parallel to the tool axis, and (d) to (f) are formed by the sub-flute provided on the blade inclined upward to the tool axis. FIGS. 9 (g) to 9 (f) are diagrams of each pattern formed by the sub-flute provided on the blade body that is inclined downward to the right with respect to the tool axis.

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

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

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A main flute and at least one set of blades are formed from the tip end side of the cutting region toward the shank side, and a sub-flute is provided so as to divide the blade body, and a main cutting edge is provided along the main flute. A rotary tool with a shank, characterized in that sub cutting edges are formed at required positions along the sub flute.