JP2015036175A - Circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular saw in which breakage or abrasion and so on of a blade base due to looseness of a cutting blade can be prevented.SOLUTION: Provided is a circular saw 10 in which plural blade bases 13 are provided on an outer periphery of a disk-shaped body 11 at predetermined intervals, and a cutting blade 20 is fixed to the blade base 13. The circular saw 10 is so configured that the cutting blade 20 is fixed to the blade base 13 by a fastening member 30 in a circumferential direction of the disk-shaped body 11 in the state that a contact area, in which the cutting blade contacts the blade base 13 on a face so formed as to have a predetermined angle with respect to a cut width S direction thereof, is wider than a contact area in which the cutting blade contacts the blade base 13 on a face formed in the cut width S direction.

Description

  The present invention relates to a circular saw used for cutting and removing an end deformed portion of various steel pipes (for example, a round steel pipe or a square steel pipe), and in particular, to each of a plurality of blade bases provided on the outer periphery of a disk-shaped main body. The present invention relates to a cutting circular saw in which a cutting blade is fixed by a fastening member.

  Conventionally, as this type of circular saw, a large number of cutting blades made of a carbide material are provided on the outer periphery of a narrow disk-shaped body, and the bottom surface of these cutting blades is fixed to the outer periphery of the disk-shaped body, There is provided one whose rear surface is fixed to a holder portion from the disk-shaped main body side (see, for example, Patent Document 1). In the circular saw of Patent Document 1, the cutting blade is directly fixed to the holder portion (blade base) by brazing in the radial direction of the disk-shaped main body.

Japanese Patent Laid-Open No. 10-6133

  However, in the circular saw of Patent Document 1, when a force is applied to the cutting blade by cutting and removing the steel pipe, the disc-shaped main body between the holder portion (the blade base) and the cutting blade gradually. The brazing may be loose and the cutting blade may rattle with respect to the holder (blade). Further, the rattling of the cutting blade causes a local force to be applied to the end portion of the holder portion (cutting blade), and there is a problem that the end portion of the holder portion (cutting plate) is damaged or worn. In particular, in a circular saw in which a cutting blade and a holder part (cutting base) are fixed by brazing, if the end of the holder part (cutting base) is damaged or worn, the broken or worn holder part There is a problem that it is not possible to replace only the (blade), and the disk-shaped body itself must be replaced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a circular saw that prevents damage or wear of the blade base due to rattling of the cutting blade.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, the circular saw according to claim 1 of the present invention is a circular saw in which a plurality of blade bases are provided at a predetermined interval on the outer periphery of the disc-shaped main body, and a cutting blade is fixed to the blade base, The contact area where the cutting blade comes into contact with the blade base at a surface formed at a predetermined angle with respect to the cutting width direction is in contact with the blade base at the surface formed in the cutting width direction. In a state where it is wider than the area, it is fixed to the blade base by a fastening member in the circumferential direction of the disk-shaped main body.

In the said structure, positioning of the cutting blade at the time of fixing to a blade stand can be reliably performed with the contact surface of the cutting blade formed with a predetermined angle with respect to the cutting width direction of a cutting blade.
In the present invention, the surface formed at a predetermined angle with respect to the cutting width direction is of course the surface formed at a predetermined angle with respect to the cutting width direction of the cutting blade. The surface includes a surface formed in a direction horizontal to the cutting width direction of the cutting blade.

  Further, in the invention according to claim 2, in the circular saw according to claim 1, the shape of the concavo-convex portion of the cutting blade that comes into contact with the blade base when fixed to the blade base by the fastening member, It is formed in a triangular shape.

  In the above configuration, when the cutting blade is fixed to the blade base, the contact area of the contact surface of the cutting blade that comes into contact with the blade base at a predetermined angle with respect to the cutting width direction of the cutting blade. However, it becomes wider than the contact area of the contact surface of the cutting blade which contacts a blade base in the surface formed in the cutting width direction of a cutting blade.

  Furthermore, the invention according to claim 3 is the circular saw according to claim 1, wherein the shape of the concavo-convex portion of the cutting blade that comes into contact with the blade base when fixed to the blade base by the fastening member, It is formed in a semicircular shape.

  In the above configuration, when the cutting blade is fixed to the blade base, the contact area of the contact surface of the cutting blade that comes into contact with the blade base at a predetermined angle with respect to the cutting width direction of the cutting blade. However, it becomes wider than the contact area of the contact surface of the cutting blade which contacts a blade base in the surface formed in the cutting width direction of a cutting blade.

  According to the circular saw of the present invention, it is possible to suppress the play of the cutting blade in the cutting width direction, and it is possible to prevent the blade base from being damaged or worn due to the play.

It is the front view of the circular saw which concerns on this invention, and the partially expanded front view of the same circular saw. (A) is a top view of a blade base, (b) is a front view of a blade base, (c) is a side view of a blade base. (A) is a top view of a cutting blade, (b) is a front view of a cutting blade, (c) is a side view of a cutting blade. It is a partially expanded side view of the circular saw when the cutting blade is fixed to the blade base. (A) is a partially enlarged side view of a circular saw according to the first other embodiment of the present invention, (b) is a partially enlarged side view of the circular saw according to the second other embodiment of the present invention. FIG. 4C is a partially enlarged side view of a circular saw according to a third other embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
First, a circular saw 10 according to the present invention will be described with reference to FIG.

  As shown in FIG. 1, the circular saw 10 is rotated by driving and rotating a rotary drive shaft such as a cutting device (not shown) in a central through hole 12 that is penetrated through the central portion of the disk-shaped main body 11. It rotates in the direction A and cuts various steel pipes such as round steel pipes and square steel pipes. In the circular saw 10, a plurality of blade bases 13 are formed at predetermined intervals on the outer periphery of the disk-shaped main body 11, and a cutting blade 20 is formed at the upper end of the blade base 13 in the circumferential direction of the disk-shaped main body 11 (of the disk-shaped main body 11. It is attached in the direction of rotation A). The cutting blade 20 is fixed to the blade base 13 by a fastening member 30 inserted in the radial direction of the disk-shaped main body 11.

Here, the main part of the circular saw 10 will be described.
First, the blade base 13 will be described.
As shown in FIGS. 1 and 2, the blade base 13 is formed so as to protrude in the radial direction of the disk-shaped main body 11. Further, the blade base 13 is formed with a cutting blade mounting portion 14 for mounting the cutting blade 20 at the upper end on the front side with respect to the rotation direction A of the disc-shaped main body 11.

  As shown in FIGS. 2 (b) and 2 (c), the cutting blade mounting portion 14 is formed in a portion where a part of the upper end portion of the blade base 13 is cut off, and viewed from the rotation direction A of the disk-shaped main body 11. It is the convex part which protruded in the substantially triangular shape. A mounting surface 15 protruding in a substantially triangular shape for mounting the cutting blade 20 is formed on the upper portion of the cutting blade mounting portion 14. The mounting surface 15 is formed along the rotation direction A of the disk-shaped main body 11 (longitudinal direction of the cutting blade mounting portion 14), and is inclined at a predetermined angle with respect to the radial direction of the disk-shaped main body 11. doing. The inclination angle of the mounting surface 15 is an acute angle with respect to the radial direction of the disc-shaped main body 11 in accordance with the shape of the cutting blade 20 (the angle formed by the contact between both inclined surfaces of the mounting surface 15 is an acute angle). Is desirable). Furthermore, a cutting blade support portion 17 for supporting the side surface of the cutting blade 20 when the steel pipe is cut by the circular saw 10 is formed at one end of the cutting blade mounting portion 14. The cutting edge support portion 17 is formed along the radial direction of the disk-shaped main body 11.

Further, as shown in FIGS. 2A and 2B, a screw hole 16 for screwing the fastening member 30 is formed in the cutting blade mounting portion 14. The screw hole 16 is formed in the central portion of the cutting blade mounting portion 14 toward the radial direction of the disk-shaped main body 11.

Next, the cutting blade 20 will be described.
As shown in FIGS. 1 and 3, the cutting blade 20 is a member formed in a substantially block shape, and is formed on the blade base 13 along the rotation direction A of the disk-shaped main body 11 (the circumferential direction of the disk-shaped main body 11). Fixed. The cutting blade 20 is formed with a blade portion 21 for cutting the steel pipe, an insertion hole 22 for inserting the fastening member 30, and a fitting portion 23 for fitting with the blade base 13. Yes.

  As shown in FIG. 3 (a), the blade portion 21 is a blade portion formed with a cutting width S at one end portion of the cutting blade 20, and when fixed to the blade base 13, the disk-shaped main body 11. It is arrange | positioned with respect to the blade base 13 so that it may become a front side with respect to the rotation direction A. Further, as shown in FIGS. 3A and 3B, the insertion hole 22 is a hole that penetrates through the central portion of the cutting blade 20.

  As shown in FIG.3 (c), the fitting part 23 is a recessed part which is formed in the bottom part of the cutting blade 20, and was dented in the inside in the substantially triangular shape by the side view. When the fitting portion 23 of the cutting blade 20 is fitted to the cutting blade mounting portion 14 of the blade base 13 on the inclined surface inclined to the inside of the fitting portion 23, the mounting surface of the cutting blade mounting portion 14 is placed. The contact surface 24 which contacts 15 is formed.

  The contact surface 24 is formed along the longitudinal direction of the cutting blade 20 and is inclined at a predetermined angle with respect to the cutting width S direction of the cutting blade 20 (the left-right direction in FIG. 3C). Yes. The inclination angle of the contact surface 24 is an acute angle with respect to a surface horizontal to the surface in the cutting width S direction of the cutting blade 20 according to the shape of the cutting blade mounting portion 14 of the blade base 13 (contact surface 24). It is desirable that the angle formed by the contact between the two inclined surfaces is an acute angle. That is, the inclination angle of the contact surface 24 is an acute angle with respect to the radial direction of the disk-shaped main body 11 (fastening direction B of the fastening member 30) when the cutting blade 20 is fixed to the blade base 13 by the fastening member 30. It is desirable to set to.

  Thus, when the cutting blade 20 is fixed to the blade base 13 by the fastening member 30 by making the inclination angle of the contact surface 24 acute, the contact surface 24 is in the cutting width S direction of the cutting blade 20. The surface formed with a predetermined angle can contact the mounting surface 15 of the cutting blade mounting portion 14 in a wide range. That is, the positioning of the cutting blade 20 with respect to the blade base 13 can be performed over a wide range on a surface formed at a predetermined angle with respect to the cutting width S direction of the cutting blade 20 on the contact surface 24.

Next, attachment of the cutting blade 20 to the blade base 13 will be described.
As shown in FIG. 4, when the cutting blade 20 is attached to the blade base 13, the fitting portion 23 of the cutting blade 20 is fitted into the cutting blade attachment portion 14 formed on the upper portion of the blade base 13. At this time, positioning of the cutting blade 20 with respect to the blade base 13 is performed on a surface formed with a predetermined angle with respect to the cutting width S direction of the cutting blade 20 on the contact surface 24 of the cutting blade 20. That is, in the cutting blade 20, positioning with respect to the blade base 13 is performed on substantially the entire contact surface 24 of the cutting blade 20. Then, the cutting blade 20 is fixed to the blade base 13 by inserting the fastening member 30 in the radial direction of the disk-shaped main body 11.

  Here, as described above, in the circular saw 10, the fastening member 30 may be gradually loosened by rotating the disk-shaped main body 11 in the rotation direction A (FIG. 1). In such a case, the cutting blade 20 is often rattled with respect to the blade base 13, and in particular, is rattled in the cutting width S direction of the cutting blade 20 (left and right direction in FIG. 4). Therefore, in the circular saw 10, by providing a large number of surfaces formed at a predetermined angle with respect to the cutting width S direction of the cutting blade 20 in the fitting portion 23 of the cutting blade 20, The rattling of the blade 20 is prevented. That is, by forming the fitting portion 23 of the cutting blade 20 in a substantially triangular shape, it is formed with a predetermined angle with respect to the cutting width S direction of the cutting blade 20 when being fixed to the blade base 13. The contact area that comes into contact with the blade base 13 at the surface to be cut is wider than the contact area that comes into contact with the blade base 13 at the surface formed in the cutting width S direction of the cutting blade 20, which Can be prevented.

  Thus, the contact area of the contact surface 24 of the cutting blade 20 that is in contact with the blade base 13 on the surface formed at a predetermined angle with respect to the cutting width S direction of the cutting blade 20 is As another embodiment in which the cutting blade 20 is fixed to the blade base 13 so as to be larger than the contact area of the contact surface 24 formed in the direction of the cutting width S of the cutting blade 20 and in contact with the blade base 13. There are three examples shown in FIG.

  As a first other embodiment, as shown in FIG. 5A, the shape of the cutting blade mounting portion 14A of the blade base 13 is a concave portion recessed in a substantially triangular shape, and the cutting blade 20 is fitted. The circular saw 10A which makes the part 23A the convex-shaped part which protruded in the substantially triangular shape is mentioned. In this case, the cutting blade 20 does not come into contact with the blade base 13 at the surface formed in the cutting width S direction, and all of the contact surfaces 24A of the cutting blade 20 are predetermined with respect to the cutting width S direction. The blade 13 is brought into contact with a surface formed with an angle.

  As another example of the second embodiment, as shown in FIG. 5 (b), the shape of the cutting blade mounting portion 14B of the blade base 13 is a convex portion protruding in a substantially semicircular shape, and the cutting blade 20 The circular saw 10B which makes the fitting part 23B into the recessed part dented in the substantially semicircle shape is mentioned. In this case, both end portions and the central portion of the contact surface 24B of the cutting blade 20 are in contact with the blade base 13 by surfaces formed in the cutting width S direction of the cutting blade 20, but other portions (both end portions) of the contact surface 24B. And a portion other than the central portion) is in contact with the blade base 13 at a surface formed with a predetermined angle with respect to the cutting width S direction of the cutting blade 20. And the contact area of the other part (parts other than both end parts and the center part) of the contact surface 24B is wider than the contact area of the both end parts and the center part of the contact surface 24B.

  Furthermore, as a third other embodiment, as shown in FIG. 5 (c), the shape of the cutting blade mounting portion 14C of the blade base 13 is a concave portion recessed in a substantially semicircular shape, and the cutting blade 20 is fitted. The circular saw 10C which makes the joint part 23C into the convex-shaped part which protruded in the substantially semicircle shape is mentioned. Also in this case, as in the second other embodiment, the contact area of the other part of the contact surface 24C (the part other than the both end parts and the central part) is wider than the contact area of the both end parts and the central part of the contact surface 24C. .

  As described above, according to the circular saw 10 according to the above embodiment, the play of the cutting blade 20 in the cutting width S direction of the cutting blade 20 can be suppressed, and the blade base 13 is damaged or worn due to the play. Can be prevented.

10 circular saw 11 disc-shaped body 13 blade base 20 cutting blade 23 fitting part (uneven portion)
30 Fastening member S Cutting width

That is, circular saw according to claim 1 of the present invention, a plurality of blade base to the outer periphery of the disk-shaped body is provided at a predetermined interval, a circular saw cutting edge is fixed to the blade base, the A mounting surface for mounting the cutting blade is formed on the blade base along the circumferential direction of the disk-shaped main body, and a fastening member for fixing the cutting blade to the blade base is screwed in the screw holes of forming in the radial direction of the disk-shaped body, said cutting edge contacts the blade base of the mounting surface be a surface which is formed to have a predetermined angle with respect to the cutting width direction the contact area of the contact surface, along with formed at widens state than the contact area of the contact surface that contacts the blade base of the mounting surface be a surface which is formed in the cutting width direction, inserting the fastening member Through which the fastening member is inserted into the disc-shaped book through the insertion hole and the screw hole. By screwing in the radial direction, the cutting edge along the circumferential direction of the disk-shaped body is intended to fix the blade base.

In the said structure, positioning of the cutting blade at the time of fixing to a blade stand can be reliably performed with the contact surface of the cutting blade formed with a predetermined angle with respect to the cutting width direction of a cutting blade.
In the present invention, the surface formed at a predetermined angle with respect to the cutting width direction is of course the surface formed at a predetermined angle with respect to the cutting width direction of the cutting blade. The surface includes a surface formed perpendicular to the cutting width direction of the cutting blade.

Claims (3)

A circular saw in which a plurality of blades are provided at predetermined intervals on the outer periphery of the disk-shaped body, and a cutting blade is fixed to the blades,
The cutting blade is
The contact area in contact with the blade rest on a surface formed at a predetermined angle with respect to the cutting width direction is larger than the contact area in contact with the blade rest on the surface formed in the cutting width direction. In this state, the circular saw is fixed to the blade base by a fastening member in the circumferential direction of the disk-shaped main body.   2. The circular saw according to claim 1, wherein the concave and convex portions of the cutting blade that come into contact with the blade base when being fixed to the blade base by the fastening member are formed in a triangular shape.   2. The circular saw according to claim 1, wherein the concave and convex portions of the cutting blade that come into contact with the blade base when being fixed to the blade base by the fastening member are formed in a semicircular shape.

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