JP2005349585A

JP2005349585A - Rotary saw

Info

Publication number: JP2005349585A
Application number: JP2004169623A
Authority: JP
Inventors: Hisao Sakai; 久夫坂井; Yusuke Miyaji; 祐介宮地
Original assignee: Tenryu Saw Manufacturing Co Ltd
Current assignee: Tenryu Saw Manufacturing Co Ltd
Priority date: 2004-06-08
Filing date: 2004-06-08
Publication date: 2005-12-22
Anticipated expiration: 2024-06-08
Also published as: JP4762507B2

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotary saw having durability by making the pitch of a part of blades smaller than that of other blades and forming slits extending inwardly in a radial direction from the tooth bottoms on the right forward rotary side of the blades of the small pitch. <P>SOLUTION: A large number of blades (4) protruding outwardly in the radial direction of a disc-shaped base metal (2) are provided to the outer periphery of the disc-shaped base metal (2) through blade stands (3) so that the pitch (P2) of a part of blades (4b) is made smaller than the pitch (P1) of other blades (4) and slits (5) extending inwardly in the radial direction from the tooth bottoms on the right forward rotary side of the blades (4b) of the small pitch are formed. Further, the pitch (P2) of a part of the blades (4b) is set to about 3/10-9/10 the pitch (P1) of the other blades (4). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、円板状の台金の外周部に半径方向に突出する多数の刃を有する回転鋸に関するものである。 The present invention relates to a rotary saw having a large number of blades protruding radially in the outer peripheral portion of a disk-shaped base metal.

従来の技術として図３に示すものがあった。図３において、１０は木工用の回転鋸であり、外径が約１２５ｍｍとなっている。１１は台金であり、外周に２４個の鋸歯形の刃台１２が形成され、各刃台１２の正転面（図３において左面）側に超硬合金製のチップからなる刃１３がろう付け固着される。上記各刃台１２及び該刃台１２に固着された刃１３のピッチＰは円周方向に等ピッチで形成される。また、例えば６個置きの刃台１２ｂの直正転側の歯底部にその歯底から回転軸心方向に延びるスリット１４が形成されている。 A conventional technique is shown in FIG. In FIG. 3, 10 is a rotary saw for woodworking, and the outer diameter is about 125 mm. Reference numeral 11 denotes a base metal, 24 sawtooth-shaped blade bases 12 are formed on the outer periphery, and a blade 13 made of a cemented carbide chip is placed on the forward rotation surface (left surface in FIG. 3) of each blade base 12. It is fixed. The pitches P of the blades 12 fixed to the blade bases 12 and the blade bases 12 are formed at equal pitches in the circumferential direction. Further, for example, a slit 14 extending in the direction of the rotation axis from the tooth bottom is formed in the tooth bottom portion on the direct rotation side of every six blade bases 12b.

上記スリット１４は、台金１１の熱変形を吸収したり、切断時の衝撃による台金１１の共振を防止したりするために形成されるものであるが、該スリット１４は台金１１の外周部を分断することになるので該スリット１４が存在する刃台１２ａ、１２ｂの剛性を低下させることになる。また、切断時に圧縮方向の負荷を受けるスリット１４の直反正回転側の刃台１２ｂが横方向に振動し易くなる。 The slit 14 is formed to absorb thermal deformation of the base metal 11 or prevent resonance of the base metal 11 due to an impact at the time of cutting. The slit 14 is an outer periphery of the base metal 11. Since the portion is divided, the rigidity of the blade bases 12a and 12b where the slits 14 are present is lowered. Further, the blade base 12b on the direct / reverse rotation side of the slit 14 that receives a load in the compression direction at the time of cutting is likely to vibrate laterally.

ところで、上記従来のものは、各刃１３が円周方向に等ピッチで形成され、切断時における各刃台１２に加わる負荷が均等となっていたため、上記スリット１４の直反正回転側の刃台１２ｂ、従ってスリット１４の直反正回転側の刃１３ｂの振動が大きくなり、該刃１３ｂが他の刃１３よりも早く磨耗、損傷するものであった。 By the way, in the above conventional one, each blade 13 is formed at an equal pitch in the circumferential direction, and the load applied to each blade base 12 at the time of cutting is uniform. Accordingly, the vibration of the blade 13b on the direct and counterclockwise rotation side of the slit 14 is increased, and the blade 13b is worn and damaged earlier than the other blades 13.

特開２００４−９２１８号公報。JP 2004-9218 A.

本発明は、一部の刃のピッチを他の刃のピッチよりも小ピッチとし、該小ピッチとした刃の直正転側の歯底から半径方向内方に延びるスリットを形成することにより、上記不具合を解消した新規な回転鋸を得ることを目的とする。 In the present invention, the pitch of some of the blades is smaller than the pitch of the other blades, and the slits extending radially inward from the tooth bottom on the straight rotation side of the blade having the small pitch are formed as described above. The purpose is to obtain a new rotary saw that solves the problem.

本発明は、上記目的を達成するために以下の如く構成したものである。即ち、請求項１に係る発明は、円板状の台金の外周に刃台を介して半径方向外方に突出する多数の刃を設けるとともに、一部の刃のピッチを他の刃のピッチよりも小ピッチとし、該小ピッチとした刃の直正転側の歯底から半径方向内方に延びるスリットを形成する構成にしたものである。
請求項２に係る発明は、前記一部の刃のピッチを他の刃のピッチに対して約３／１０〜９／１０としたものである。 The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is provided with a large number of blades projecting radially outward through the blade base on the outer periphery of the disk-shaped base metal, and the pitch of some blades is set to the pitch of other blades. And a slit extending radially inward from the tooth bottom on the straight rotation side of the blade having the smaller pitch.
The invention according to claim 2 is such that the pitch of the part of the blades is about 3/10 to 9/10 with respect to the pitch of the other blades.

請求項１に係る発明は、スリットの直反正回転側の刃が他の刃よりも小ピッチとなっているので、この刃の切削量が他の刃の切削量よりも少なくなる。このため、上記スリットの直反正回転側の刃台の振動が抑制され、該刃台に保持される刃、つまり小ピッチの刃の磨耗、損傷が低減することになる。
請求項２に係る発明は、前記一部の刃のピッチを他の刃のピッチに対して約３／１０〜９／１０としたので、スリットの直正転側の刃台の肉量、従って該刃台の剛性がさほど低下しなくなり、これの耐久性を保持しながら、前記スリットの直反正回転側の刃の磨耗、損傷を低減させることができる。 In the invention according to claim 1, since the blade on the direct and counterclockwise rotation side of the slit has a smaller pitch than the other blade, the cutting amount of this blade is smaller than the cutting amount of the other blade. For this reason, the vibration of the blade base on the direct / reverse rotation side of the slit is suppressed, and the wear and damage of the blade held by the blade blade, that is, the small pitch blade is reduced.
In the invention according to claim 2, since the pitch of the part of the blades is about 3/10 to 9/10 with respect to the pitch of the other blades, the thickness of the blade base on the straight rotation side of the slit, and accordingly The rigidity of the blade base does not decrease so much, and wear and damage of the blade on the direct / reverse rotation side of the slit can be reduced while maintaining the durability thereof.

以下本発明の実施例を図面に基いて説明する。図面において、図１は本発明による回転鋸の側面図、図２は本発明による刃の切削量の比較図、図３は従来による回転鋸の側面図である。 Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a side view of a rotary saw according to the present invention, FIG. 2 is a comparative view of the cutting amount of a blade according to the present invention, and FIG. 3 is a side view of a conventional rotary saw.

図１において、１は本発明による木工用の回転鋸であり、本例では外径Ｄ１が約１２５ｍｍとなっている。２は回転鋸１の台金であり、ＳＫＳ−５、ＳＫ−５等の鋼板材により形成され、外周に２４個の鋸歯形の刃台３を有する。上記各刃台３の正転面（図１において左面）側に超硬合金製のチップからなる刃（平刃）４をろう付け固着する。 In FIG. 1, 1 is a rotary saw for woodworking according to the present invention, and in this example, the outer diameter D1 is about 125 mm. Reference numeral 2 denotes a base of the rotary saw 1, which is formed of a steel plate material such as SKS-5, SK-5, and has 24 sawtooth-shaped blade bases 3 on the outer periphery. A blade (flat blade) 4 made of a cemented carbide chip is brazed and fixed to the normal rotation surface (left surface in FIG. 1) of each of the blade bases 3.

上記刃台３は、６個置きに小ピッチの刃台３ｂを形成し、該小ピッチにした刃台３ｂの直正転側（図１において左部）の歯底から半径方向内方に延びるスリット５を形成する。上記スリット５の直正回転側の刃台３ａに保持された刃４ａと、スリット５の直反正回転側の刃台３ｂに保持された刃４ｂとのピッチＰ２は、他の刃台３，３に保持された刃４，４のピッチＰ１に対して約３／１０〜９／１０、好ましくは６／１０とする。また、上記スリット５の幅Ｗ１は約１．２ｍｍ、その長Ｌ１は約１０ｍｍにするとともに、半径方向内端に約５ｍｍの円形孔５ａを形成する。また、上記スリット５は半径線に対して前傾させるとともに、この前傾の角度Ｋ１は約８度とする。６は台金２の中心部に形成した取付孔である。 The blade base 3 is formed with a small pitch blade base 3b every six pieces, and a slit extending inward in the radial direction from the root of the direct rotation side (left part in FIG. 1) of the blade base 3b having the small pitch. 5 is formed. The pitch P2 between the blade 4a held on the blade base 3a on the straight rotation side of the slit 5 and the blade 4b held on the blade base 3b on the straight rotation side of the slit 5 is different from that of the other blade tables 3 and 3. About 3/10 to 9/10, preferably 6/10 with respect to the pitch P1 of the held blades 4 and 4. The slit 5 has a width W1 of about 1.2 mm, a length L1 of about 10 mm, and a circular hole 5a of about 5 mm at the radially inner end. The slit 5 is tilted forward with respect to the radial line, and the forward tilt angle K1 is about 8 degrees. Reference numeral 6 denotes an attachment hole formed in the central portion of the base metal 2.

なお、上記各部の寸法、刃台３の数、スリット５の数等は、被削材の種類、回転鋸の外径等によって適宜設定する。また、上記角スリット５内に軟質性の樹脂を充填するようにしもよい。 In addition, the dimension of each said part, the number of the blade bases 3, the number of the slits 5 etc. are suitably set with the kind of workpiece, the outer diameter of a rotary saw, etc. Alternatively, the square slit 5 may be filled with a soft resin.

上記実施例によれば、回転鋸１により合板等の被削材７を切削すると、図２に示すように、小ピッチにした刃４ｂの切削量Ｆ２が他の刃４の切削量Ｆ１よりも少なくなる。このため、上記スリット５の直反正回転側の刃台３ｂの振動が抑制され、該刃台３ｂに保持される刃４ｂの磨耗、損傷が低減し、これの寿命が延引することになる。 According to the above embodiment, when the work material 7 such as plywood is cut by the rotary saw 1, the cutting amount F2 of the blade 4b having a small pitch is larger than the cutting amount F1 of the other blades 4 as shown in FIG. Less. For this reason, the vibration of the blade base 3b on the direct / reverse rotation side of the slit 5 is suppressed, the wear and damage of the blade 4b held by the blade base 3b is reduced, and the life thereof is extended.

また、スリット５の直反正回転側刃４ｂのピッチＰ２を他の刃４のピッチＰ１に対して約３／１０〜９／１０としたので、上記スリット５の直反正回転側の刃４ｂの寿命が延引するとともに、該スリット５の直正転側の刃台３ａの肉量がさほど低下しなくなり、従って該刃台３ａの剛性がさほど低下しなくなる。このため、上記刃台３ａの耐久性が保持されることになる。 Moreover, since the pitch P2 of the direct / reverse rotation side blade 4b of the slit 5 is set to about 3/10 to 9/10 with respect to the pitch P1 of the other blades 4, the life of the blade 4b on the direct / reverse rotation side of the slit 5 is increased. And the thickness of the blade base 3a on the straight rotation side of the slit 5 does not decrease so much, and therefore the rigidity of the blade base 3a does not decrease so much. For this reason, the durability of the blade base 3a is maintained.

なお、前述した刃４，４ａ，４ｂの形状は平歯以外の他の形状にしてもよい。例えば、先端傾き角が交互に逆向きに傾斜する交互傾斜刃、先端切刃が山形となる山形刃、あるいは先端切刃が谷形となる谷形刃等にしてもよい。 The shape of the blades 4, 4 a, 4 b described above may be other shapes than spur teeth. For example, an alternate inclined blade whose tip inclination angles are alternately inclined in opposite directions, a chevron blade whose tip cutting edge is a chevron, or a valley blade whose tip cutting blade is a valley shape, or the like may be used.

本発明による回転鋸の側面図である。1 is a side view of a rotary saw according to the present invention. 本発明による刃の切削量の比較図である。It is a comparison figure of the cutting amount of the blade by this invention. 従来による回転鋸の側面図である。It is a side view of the conventional rotary saw.

Explanation of symbols

１回転鋸
２台金
３刃台
３ａスリットの直正転側の刃台
３ｂスリットの直反正転側の刃台
４刃
４ａスリットの直正転側の刃
４ｂスリットの直反正転側の刃
５スリット
６取り付け孔
７被削材 DESCRIPTION OF SYMBOLS 1 Rotating saw 2 Base 3 Blade base 3a Direct-forward rotation side blade base 3b Slit direct / reverse rotation side blade base 4 Blade 4a Slit direct rotation side blade 4b Slit direct / forward rotation side blade 5 Slit 6 Mounting hole 7 Work material

Claims

A number of blades (4) projecting radially outward through the blade base (3) are provided on the outer periphery of the disk-shaped base metal (2), and the pitch (P2) of some blades (4b) is set. The pitch is smaller than the pitch (P1) of the other blade (4), and a slit (5) extending inward in the radial direction from the root of the straight rotation side of the blade (4b) having the smaller pitch is formed. Rotating saw.

The rotary saw according to claim 1, wherein the pitch (P2) of some of the blades (4b) is about 3/10 to 9/10 with respect to the pitch (P1) of other blades (4).