JP2009125891A - Rotary cutting blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a pedestal is expanded from inside due to a friction heat that is generated by the contact with chips during cutting work and can not be neglected, to thereby generate distortion, then a blade body at the tip end of the pedestal is also affected thereby, resulting in heavy cutting. <P>SOLUTION: A rotary cutting blade 1 includes: a disc-shaped pedestal 3 having a connection hole 5 at the center; and a rotary cutting blade 1 having a blade body 7 on an outer periphery of the pedestal, wherein an annularly recessed annular recess portion 17 is formed between an inside connecting holes side and an outside blade body side on both surfaces of the pedestal 3. Preferably, plate thickness dimensions of the connection hole side, being the inside of the annular recess portion, and the blade body side, being the outside of the annular recess portion, are approximately set to be same, so that the frictional heat is hardly generated, and the generated frictional heat is smoothly released. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary cutting blade used for cutting metal materials, wood, and the like.

The rotary cutting blade has a base plate formed in a disk shape, a plurality of saw blades (including a tip saw) and blade blades are formed on the outer peripheral portion thereof, and a connection hole is formed at the center.
The rotary cutting blade has a rotating shaft of a motor as a driving means inserted and fixed in a connecting hole during cutting work, and is rotated integrally with the rotating shaft by driving the motor so that the workpiece is cut. It is designed to cut.
As shown in Patent Document 1, the conventional base metal is configured such that the plate thickness dimension is substantially constant over the entire surface, and the plate thickness dimension is such that the base metal can withstand a cutting shock during the cutting operation. It is set to a certain size so as to give a sufficient rigidity.

JP-A-7-285023

During the cutting operation, cutting heat is generated when cutting the workpiece on the blade body, and frictional heat is generated by contact of chips with the base metal.
Thus, when the cutting heat is increased, the entire outer peripheral portion around the chip is heated and expanded to cause distortion. If the cutting operation is continued in this state, not only the chip may be damaged, but also the chip is greatly shaken in the cutting width direction, and the cutting becomes heavy or the cutting surface becomes rough. . Therefore, conventionally, in order to release the heat of cutting well, a plurality of slits or the like extending through the blade chamber at a predetermined length from the bottom to the center have been formed.
On the other hand, the frictional heat was lower than the cutting heat, and thus was not so much considered.

However, recently, high-speed rotation is required at the time of cutting work in consideration of cutting efficiency, and accordingly, frictional heat cannot be ignored. However, even if the frictional heat is high, if the cutting heat is still relatively high, it is difficult for the heat to escape outward. For this reason, the base metal expands from the inside due to frictional heat that cannot escape, causing distortion, and the blade at the tip is also affected, resulting in heavy cutting.
Therefore, in order to solve the above-mentioned problems, the present invention is less likely to generate frictional heat than the conventional metal, even if the cutting work is performed while rotating at a high speed as in the conventional case. An object of the present invention is to provide a rotary cutting blade having a structure that is difficult to accumulate.

  In order to solve the above-mentioned problems, the invention of claim 1 is a rotary base blade having a disk-shaped base metal having a connecting hole in the center and a blade body on the outer periphery of the base metal, wherein the base metal The rotary cutting blades are characterized in that annular recesses are formed on both sides of the ring between the inner connecting hole side and the outer blade body side.

  The invention of claim 2 is characterized in that, in the rotary cutting blade according to claim 1, the plate thickness dimension of the base metal on the side of the connecting hole inside the annular recess and the side of the blade body from the outside is substantially the same. It is a rotary cutting blade.

  A third aspect of the present invention is the rotary cutting blade according to the second aspect, wherein the total step size of the annular recesses formed on both surfaces is 0.1 to 0.4 mm. .

  A fourth aspect of the present invention is the rotary cutting blade according to any one of the first to third aspects, characterized in that a separate tip is attached to the blade body to form a tip saw.

  When the rotary cutting blade of the present invention is used, the base metal hardly generates frictional heat even if the cutting operation is performed while rotating the rotary cutting blade at a high speed as in the conventional case, and even if it is generated, the heat is smoothly radiated. Therefore, the object to be cut can be cut lightly over a long period of time. Moreover, the generation of noise can be suppressed.

A rotary cutting blade 1 according to an embodiment of the present invention will be described with reference to FIGS.
The rotary cutting blade 1 is a tip saw as shown in the perspective view of FIG.
Reference numeral 3 denotes a base (= main body). The base 3 has a disc shape, and a rotation shaft (not shown) for transmitting engine power is fitted into and connected to the center of the base 3. A connecting hole 5 is formed. A plurality of blades 7 having the same shape protruding radially outward are integrally formed on the outer periphery of the base metal 3 with the same pitch. A tip seat 9 for tip attachment is formed on the front side in the rotational direction of each blade body 7.
Further, since the rotary cutting blade 1 is for cutting a metal material, a bump 11 is formed on the rear side in the rotational direction.

Between adjacent blade bodies 7, a blade chamber 13 (= chip pocket) having the same shape is formed.
Reference numeral 15 denotes a chip, and the chip 15 is made of a hard material such as a cemented carbide. The tip 15 is a grindstone-like cutting blade. The chip 15 is joined to the above-described chip seat 9 by an ordinary method such as brazing.

The base metal 3 will be described in detail.
The base metal 3 is formed by cutting a flat steel plate having a uniform thickness dimension by punching or laser cutting, and as described above, a connecting hole 5 is formed at the center thereof, The blade body 7 is formed.
Reference numeral 17 denotes a shallow annular recess, and the annular recess 17 is similarly formed on both surfaces of the base metal 3. The annular recess 17 is formed by being cut coaxially with the connecting hole 5, and has an outer peripheral step portion 19 on the outer side and an inner peripheral step portion 21 on the inner side.
The connection hole 5 side inside the annular recess 17 and the outer blade body 7 side of the base metal 3 are left as non-cutting regions, and the plate thickness dimensions of those cut regions are flat as a whole. It is the same as the plate thickness dimension (a) (usually about 1 to 3 mm).

  The annular recess 17 is formed with the same depth dimension, that is, a step dimension (1 / 2b) throughout. Twice (b) of this step size is the total size of the cutting depth from both sides of the base metal 3, but this (b) is preferably set to about 0.1 to 0.4 mm. This is because if it is deeper than 0.4 mm, it is difficult to maintain the minimum rigidity of the base metal 3 as a whole, while if it is shallower than 0.1 mm, the effectiveness due to the formation of the annular recess 17 is reduced.

The distance (c) from the outer diameter x of the rotary cutting blade 1 to the outer peripheral step portion 19 is 1 of the depth dimension (d) from the outer diameter x of the rotary cutting blade 1 to the bottom of the blade chamber 13 of the blade body 7. It is preferably 5 times or more. This is because, if the outer peripheral step 19 of the annular recess 17 is retracted inward with such a size, the outer periphery of the rotary cutting blade 1 has sufficient rigidity to withstand a cutting shock against the workpiece.
The distance (e) from the center y of the rotary cutting blade 1 to the inner circumferential step portion 21 is preferably at least twice the dimension (f) from the center y of the rotary cutting blade 1 to the hole diameter of the connecting hole 5. If the inner circumferential step portion 21 of the annular recess 17 expands outward with such a size, the inner periphery of the rotary cutting blade 1 has sufficient rigidity to support the rotating shaft inserted and fixed in the connecting hole 5. It is because it has.

Reference numeral 23 denotes a window, and four windows 23 having the same shape are formed through the annular recess 17 of the base metal 3. The windows 23 are formed so as to maintain a weight balance with each other. By forming the window 23, heat dissipation of the base metal 3 is promoted and the weight is reduced.
Reference numeral 25 denotes a slit, and four slits 25 having the same shape are formed by penetrating from the bottom of the blade chamber 13 toward the center y with a predetermined length. The slits 25 are formed so as to maintain a weight balance with each other. By forming the slit 25, the cutting heat generated in the blade body 7 at the time of cutting the workpiece can easily escape. Moreover, the thermal influence at the time of chip joining can be suppressed.

  The rotary cutting blade 1 has the same structure as the conventional rotary cutting blade except that the annular recess 17 is formed by cutting, and can be manufactured in the same manner.

In this rotary cutting blade 1, annular recesses 17 that are recessed from the periphery are formed on both surfaces of the base metal 3, and the object to be cut or cutting scraps on the base metal 3 during the cutting operation by the amount recessed from the periphery. Even if it hits, the impact shock is relatively small. Therefore, the amount of frictional heat generated can be kept lower than that of a conventional rotary cutting blade made of a base metal having the same thickness. Generation of noise due to contact is also suppressed.
In addition, the annular recess 17 of the base metal 3 is less likely to hit an object to be cut or cutting waste as much as it is recessed from the periphery, and a large air passage is formed between them. Therefore, the generated frictional heat is radiated smoothly.
Furthermore, since the annular recess 17 is formed in a coaxial annular shape, unpleasant wind noise due to the formation of the annular recess 17 hardly occurs.

  The plate thickness dimensions near the connection hole 5 and the blade body 7 are the same as those of the conventional rotary cutting blade, so that the rigidity necessary for supporting the rotary shaft as a bearing and the cutting of the workpiece Rigidity necessary to withstand shocks is secured.

  Even when the rotary cutting blade 1 is driven at the same number of rotations as a conventional rotary cutting blade, it is difficult for an object to be cut or cutting waste to hit the base metal 3 during the cutting operation. Since the load on the motor, which is the driving means, should be relatively small, the supply voltage to the motor seems to be lower than before.

Although the embodiments of the present invention have been described in detail above, the specific configuration is not limited to the above-described embodiments, and there are design changes, material changes, and the like without departing from the scope of the present invention. It is included in the invention.
For example, in the above-described embodiment, the tip is attached to any rotary cutting blade, but even a simple circular saw without a separate cutting blade such as a tip or abrasive grains such as diamond on the cutting edge surface An applied cutter or the like may be used.
In any case, the scope of the present invention is not limited except for the claimed shape and the like, and any conventional or future shape or material can be arbitrarily combined.

  Although the rotary cutting according to the present invention is relatively simple and easy to process, the cutting is lighter than the conventional one. As a result, not only the cutting operation is facilitated, but also the tool life is long, and economical. It is.

It is a perspective view of the rotary cutting blade which concerns on embodiment of this invention. It is a top view of the rotary cutting blade of FIG. It is a side view of the rotary cutting blade of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotary cutting blade 3 ... Base metal 5 ... Connection hole 7 ... Blade body 9 ... Tip seat 11 ... Cove 13 ... Blade chamber 15 ... Tip 17 ... Annular recess 19 ... Outer peripheral step 21 ... Inner peripheral step 23 ... Window 25 ... Slit

Claims (4)

  A disk-shaped base metal having a connection hole in the center, and a rotary cutting blade provided with a blade body on the outer periphery of the base metal, the inner connection hole side and the outer blade body side on both sides of the base metal, respectively. A rotary cutting blade characterized in that an annular recess recessed in an annular shape is formed therebetween.   2. The rotary cutting blade according to claim 1, wherein the thickness of the base metal on the side of the connecting hole on the inner side of the annular recess is substantially the same as that on the blade body side of the outer side of the base metal.   The rotary cutting blade according to claim 2, wherein the sum of the step sizes of the annular recesses formed on both surfaces is 0.1 to 0.4 mm.   The rotary cutting blade according to any one of claims 1 to 3, wherein a separate tip is attached to the blade body to form a tip saw.

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