JP2012086361A - Circular saw blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide inexpensive circular saw blades from which a blade of specifications responding to a shape of a cutting object can be chosen.SOLUTION: The circular saw blade includes: a base section 2 which rotates; and a plurality of blade edge formed chips 6 which cover the whole periphery of the base section 2. The base section 2 has same-size recessed steps 21a alternately on both sides of its outer peripheral edge, and the respective blade edge formed chips 6 each have a fitting part 6b which fits the recessed step on its inner part side. The fitting parts of the blade edge formed chips, the recessed steps of the base section and end faces of adjacent blade edge formed chips are integrated by brazing or welding.

Description

  The present invention relates to a circular saw blade.

  Conventionally, a circular saw blade is known. The circular saw blade of high speed metal saw is soft and unsuitable for cutting high-tensile steel products. Carbide circular saw blades are suitable for cutting high-hardness steel products. For example, a carbide tip saw (see, for example, Patent Document 1) and a carbide solid saw are suitable.

  Japanese Patent Laid-Open No. 05-228727 is an example in which special steel such as high speed steel is used for the bladed portion (segment) and ordinary carbon steel is used for the base portion (body portion).

JP 2009-297852 A JP 05-228727 A

However, carbide tip saws are limited in the attachment of blades with specifications that match the shape of the object to be cut. The solid carbide saw is very expensive, although it can be freely provided with a blade having a specification adapted to the shape of the object to be cut.
Therefore, an object of the present invention is to provide an inexpensive circular saw blade while making it possible to provide a blade having a specification adapted to the shape to be cut.

  The circular saw blade according to the present invention achieves the above-mentioned object, and the means of claim 1 includes a base portion that rotates around a shaft hole, and a blade portion on the outer periphery. A circular saw blade comprising a plurality of bladed parts covering the outer periphery of the base part, wherein the base part is alternately provided with concave step parts having the same size on the front and back surfaces of the outer peripheral edge, The bladed portion is provided with a fitting portion that matches the concave stepped portion on the inner periphery, and the fitting portion of the bladed portion and the concave stepped portion of the base portion, and the end surface of the adjacent bladed portion are provided. In the state integrated by brazing and welding, the sum of the thicknesses of the recessed step portion and the fitting portion is equal to the thickness of the step portion.

  According to a second aspect of the present invention, in the first aspect, thin portions are formed on the left and right end surfaces of each of the blade-attached portions, and the thin portions of the end surfaces of adjacent blade-attached portions are overlapped and integrated. The thickness in the state which was carried out is equal to the thickness of the said base part.

  According to a third aspect of the present invention, in the first or second aspect described above, a recess is formed in the concave step portion of the base portion that contacts the fitting portion of the bladed portion.

  In the circular saw blade of the present invention, the concave step portion is formed on the outer peripheral edge of the front and back surfaces of the base portion, and the fitting portion to be fitted into the concave base portion is formed on the blade-attached portion. The fitting part is inserted into the part and brazed and welded, and the end parts of the bladed parts are integrated by brazing or welding, so that the brazing area between the base part and the bladed part is increased. And the bladed portion are strengthened, and the bladed portion can be prevented from being detached from the base portion.

  In addition, the thin part is formed on the left and right end faces of the bladed part, and the thin part of the end face of the adjacent bladed part is formed and integrated, so that the joining state between the base part and the bladed part becomes stronger. It is.

  In addition, since a recess was formed in the stepped part of the base part in contact with the fitting part of the bladed part, the expansion or contraction of the base part that occurs during brazing or welding is released, and the shape of the circumferential surface changes It has the effect which can prevent.

It is an assembly front view of the circular saw blade concerning a first embodiment of the present invention. It is a front view of the base part 2 of FIG. It is a front view of the part 4 with a blade of FIG. It is an assembly front view of a circular saw blade concerning a second embodiment of the present invention. FIG. 4 shows the bladed portion of FIG. 4, (a) is a side view of the bladed portion, and (b) is a front view. The other bladed part of FIG. 4 is shown, (a) is a side view, (b) is a front view. It is a front view of the base part of FIG. It is a front view of the base part 2 which concerns on the modification of 2nd embodiment of this invention. The bladed part which concerns on the modification of 2nd embodiment of this invention is shown, (a) is a side view, (b) is a front view. The vicinity of the outer peripheral surface of the base part and the bladed part in the first embodiment is shown, (a) is a cross-sectional view of FIG. 3, and (b) is a cross-sectional view in another modification. The case where a bladed part has a knife-like blade is shown, (a) is a front view, and (b) is a side view. It is a front view of the base which concerns on the modification of 1st embodiment of this invention. It is an assembly front view of the circular saw blade which concerns on the modification of 1st embodiment of this invention. It is an assembly front view of the circular saw blade which concerns on the further another modification of 1st embodiment of this invention. It is a front view of the part with a blade of FIG. It is an assembly front view of the circular saw blade which concerns on the other modification of FIG. It is the assembly front which concerns on the circular saw blade of 3rd embodiment of this invention. It is a front view of the base part in FIG. It is a front view of the part with a blade in FIG. It is an assembly front view concerning the circular saw blade of a 4th embodiment of the present invention. It is a front view of the base part in FIG. The bladed part in FIG. 2 is shown, (a) is a front view, (b) is an end view of the AA line of the front view. It is the front view which formed the hollow in the base part of 4th embodiment of this invention. It is an assembly front view of the circular saw blade which concerns on the other modification of 4th embodiment of this invention. It is a front view of the base part in FIG. 24 shows a bladed portion in FIG. 24, (a) is a front view of the bladed portion, (b) is an end view taken along line AA of the front view, and (c) is an end view taken along line BB of the front view. .

Embodiments of the present invention will be described below with reference to the drawings.
First Embodiment FIG. 1 is an assembled front view of a circular saw blade 1 according to a first embodiment of the present invention.
FIG. 2 is a front view of the platform 2 according to the first embodiment of the present invention.
FIG. 3 is a front view of the bladed portion 4 according to the first embodiment of the present invention.

With reference to FIG. 1, the circular saw blade 1 includes a base portion 2 and a bladed portion 4.
With reference to FIG. 1 and FIG. 2, the base part 2 is a rotary body (for example, disk), and rotates. Near the center of the pedestal 2, a shaft hole 2 a through which the rotation shaft passes is formed. The center of rotation of the base 2 is at the center of the shaft hole 2a. The outer peripheral surface 2b of the base part 2 is illustrated in a circular shape in FIGS. Since the base part 2 has thickness, the outer peripheral surface cuspita unit 2b illustrated in a circle is a curved surface. It can be said that the rotation center of the base part 2 is the center of the outer peripheral surface 2b illustrated in a circle.

  Referring to FIG. 1, there are a plurality of bladed portions 4 (20 in the example shown in FIG. 1), which cover all of the outer peripheral surface 2 b of the base 2. In the example of FIG. 1, the bladed portion 4 covers the outer peripheral surface 2 b by 360/20 = 18 °.

  With reference to FIG. 1 and FIG. 3, the bladed portion 4 has a joint portion 4a and a blade portion 4b. The joint portion 4 a is in contact with the outer peripheral surface 2 b of the base portion 2. The blade part 4b is arranged farther from the center of rotation of the base part 2 than the joint part 4a.

  The center of curvature of the joint 4 a coincides with the center of rotation of the base 2. Therefore, the joining portion 4a is in close contact with the outer peripheral surface 2b of the pedestal portion 2. The joint 4a and the outer peripheral surface 2b are brazed.

  In addition, the modification which the outer peripheral surface 2b protrudes in the direction away from the rotation center of the base part 2 is also considered. FIG. 10 is a cross-sectional view (FIG. 10A) near the outer peripheral surface 2b of the pedestal 2 and the bladed portion 4 in the first embodiment, and the pedestal 2 and the bladed in the modification of the first embodiment. It is sectional drawing (FIG.10 (b)) of the outer peripheral surface 2b vicinity with the part 4. FIG.

  With reference to FIG. 10A, the outer peripheral surface 2 b of the pedestal 2 in the first embodiment does not protrude in a direction away from the center of rotation of the pedestal 2. With reference to FIG. 10B, the outer peripheral surface 2 b of the base part 2 in the base part 2 in the modification of the first embodiment protrudes in a direction away from the center of rotation of the base part 2. The protrusion of the outer peripheral surface 2b as shown in FIG. 10B increases the brazing area between the joint portion 4a and the outer peripheral surface 2b, thereby further strengthening the brazing. In addition, although the form shown in FIG.10 (b) was demonstrated as a modification of 1st embodiment, it is realizable also as a modification of embodiment after this.

The blade part 4b has a blade. The blade included in the blade portion 4b is, for example, a saw blade, but may be any blade as long as it is a blade.
For example, the blade included in the blade portion 4b may have a shape similar to a knife. That is, the blade may have a shape that becomes thinner as the distance from the center of curvature of the joint 4a increases. FIG. 11 is a front view (FIG. 11A) and a bb cross-sectional view (FIG. 11B) when the bladed portion 4 has a knife-like blade. It can be seen that the bladed portion 4 has a shape in which the blade portion 4b becomes thinner as it moves away from the center of curvature of the joint portion 4a (from the joint portion 4a toward the blade portion 4b). This means that the blade portion 4b has a knife-like blade. The form shown in FIG. 11 has been described as a modification of the first embodiment, but can also be realized as a modification of the subsequent embodiments.

  In addition to the shaft hole 2a, the base part 2 has holes. When the base part 2 expands or contracts due to a temperature change during brazing, the base part 2 is expanded or contracted in these holes so that the shape of the outer peripheral surface 2b does not change. A hole has been drilled. Or these holes are also for preventing the resonance at the time of cutting the cutting object by rotating the circular saw blade 1.

  Moreover, the material of the base part 2 is tool steel, such as SKS, SKD, and SKH, for example. The material of the bladed portion 4 is, for example, cemented carbide or cermet material. The material of the base part 2 and the material of the bladed part 4 are different.

  The circular saw blade 1 is used through a shaft in the shaft hole 2a. As the shaft rotates, the circular saw blade 1 rotates to cut the object to be cut.

  According to the first embodiment of the present invention, the thickness of the bladed portion 4 (interval between the joint portion 4a and the blade portion 4b) is arbitrary, and the outer diameter of the circular saw blade can be arbitrarily set. it can. Moreover, the shape and pitch of the blade of the blade portion 4b can be arbitrarily set. Thereby, it becomes possible to provide the circular saw 1 provided with the blade of the specification match | combined with the shape of cutting object. And since the base part 2 is cheap tool steel, it is cheap compared with a solid carbide saw.

  Furthermore, according to the first embodiment of the present invention, the entire bladed portion 4 is a member suitable for cutting, such as cemented carbide or a cermet material, so that only a small part of the blade tip is made of cemented carbide or a cermet material. Compared to a certain carbide tip saw, the polishing allowance is large, and polishing can be performed many times.

Moreover, since there are a plurality of bladed portions 4, even if a portion of the bladed portion 4 becomes unusable due to damage or the like, if only the bladed portion 4 that has become unusable is replaced, the circular saw blade 1 Can be repaired.
In addition, the circular saw blade 1 which provided the hollow 2b-2 in the base part 2 as a modification of 1st embodiment is demonstrated.

  FIG. 12 is a front view of the platform 2 according to a modification of the first embodiment of the present invention. FIG. 13 is an assembly front view of the circular saw blade 1 according to a modification of the first embodiment of the present invention.

  The outer peripheral surface 2b of the base part 2 concerning the modification of 1st embodiment has the circumferential surface 2b-1 and the hollow 2b-2. The circumferential surface 2b-1 is similar to the outer circumferential surface 2b according to the first embodiment, but is illustrated as a discontinuous circle by the depression 2b-2 (see FIG. 12). The recess 2 b-2 is recessed toward the center of rotation of the base part 2. Referring to FIG. 13, the recess 2b-2 is separated from the joint 4a.

  According to the circular saw blade 1 according to the modification of the first embodiment, the recess 2b-2 is separated from the joint 4a. For this reason, when the base part 2 expands or contracts due to a temperature change during brazing, the base part 2 is expanded or contracted in the recess 2b-2 so that the shape of the circumferential surface 2b-1 does not change. Can be.

Still another modification of the first embodiment will be described with reference to FIGS.
As shown in FIGS. 12 and 13, the base portion 2 is the same in that the circumferential surface 2 b-1 is formed with a recess 2 b-2. On the other hand, the joint 4a of the bladed portion 4 has a projecting portion 4c composed of an arc portion 4c-1 having the same arc shape as the recess 2b-2 and a horizontal portion 4c-2 at the tip of the arc portion 4c-1. Are integrally formed.

  The projecting portion 4c formed in this manner is fitted into the recess 2b of the base portion 2 and is fixed by brazing, welding, adhesion, or the like, so that a load in the circumferential direction due to cutting work or the like of the workpiece is applied. However, since the force is dispersed, the bladed portion 4 is prevented from being peeled off, and therefore, the bladed portion 4 can be prevented from being detached from the base portion 2. In addition, it is natural that the side surfaces of the bladed portions 4 are also integrated by means such as brazing.

  Further, since a gap is formed between the horizontal portion 4c-2 of the protruding portion 4c and the arc bottom of the recess 2b-2, the recess 2b is expanded when the base portion 2 expands or contracts due to a temperature change during brazing. -2, it is possible to prevent the expansion or contraction of the pedestal 2 from escaping and causing the shape of the circumferential surface 2b-1 to change.

  FIG. 16 shows a state in which the second recess 2b-2 ′ located at the side surface joint portion between the bladed portions 4 is formed in a state where the bladed portion 4 is fixed to the base portion 2. FIG. And by this hollow 2b-2 ', the expansion | swelling part or shrinkage | contraction part of the base part 2 is escaped more with the said hollow 2b-2, and the change of the shape of the circumferential surface 2b-1 is prevented. .

Second Embodiment A circular saw blade 1 according to a second embodiment of the present invention includes a protruding portion 42c, 42d, 44c, and 44d in the bladed portion 4 according to the first embodiment, and further includes a protruding portion 42c. 42d, 44c, 44d and the base 2 are fixed to each other with a penetrating member (such as a bolt or a pin).

  FIG. 4 is an assembly front view of the circular saw blade 1 according to the second embodiment of the present invention. FIG. 5 is a side view (FIG. 5A) and a front view (FIG. 5B) of the bladed portion 42 according to the second embodiment of the present invention. FIG. 6 is a side view (FIG. 6A) and a front view (FIG. 6B) of the bladed portion 44 according to the second embodiment of the present invention. FIG. 7 is a front view of the platform 2 according to the second embodiment of the present invention. Hereinafter, the same parts as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  Referring to FIG. 4, the circular saw blade 1 includes a base portion 2 and bladed portions 42 and 44. The bladed portion 42 and the bladed portion 44 are disposed adjacent to each other. Therefore, the bladed portion 42 and the bladed portion 44 are arranged in units of 20/2 = 10.

  Referring to FIG. 5, the bladed portion 42 includes a joint portion 42a, a blade portion 42b, and projecting portions 42c and 42d. Since the joining part 42a and the blade part 42b are the same as the joining part 4a and the blade part 4b in the first embodiment, description thereof is omitted. The protruding portions 42c and 42d are portions protruding from the joint portion 42a. In the example shown in FIG. 5, the protruding portions 42 c and 42 d protrude toward the center of curvature of the joint portion 42 a. The protrusions 42c and 42d are arranged on the front side of the bladed portion 42, and are provided with holes for inserting penetrating members (bolts, pins, etc.). One of the projecting portions 42 c and 42 d may be disposed on the front side of the bladed portion 42, and the other may be disposed on the back side of the bladed portion 42. Moreover, although two protrusions (protrusions 42c and 42d) are provided, the number of protrusions may be one or more. For example, the number of the protruding portions may be one, and the width thereof may be wider than the protruding portions 42c and 42d. In this case, two or more holes may be formed.

  Referring to FIG. 6, the bladed portion 44 includes a joint portion 44a, a blade portion 44b, and projecting portions 44c and 44d. Since the joining part 44a and the blade part 44b are the same as the joining part 4a and the blade part 4b in 1st embodiment, description is abbreviate | omitted. The protruding portions 44c and 44d are portions protruding from the joint portion 44a. In the example shown in FIG. 6, the protrusions 44 c and 44 d protrude toward the center of curvature of the joint 44 a. The projecting portions 44c and 44d are disposed on the back side of the bladed portion 44, and are provided with holes for inserting penetrating members (bolts, pins, etc.). One of the projecting portions 44 c and 44 d may be disposed on the front side of the bladed portion 44, and the other may be disposed on the back side of the bladed portion 44. Further, although two protrusions (protrusions 44c and 44d) are provided, the number of protrusions may be one or more. For example, the number of the protruding portions may be one, and the width thereof may be wider than the protruding portions 44c and 44d. In this case, two or more holes may be formed.

  Referring to FIG. 7, the base 2 has a shaft hole 2a, an outer peripheral surface 2b, and recesses 2c and 2d. Since the shaft hole 2a and the outer peripheral surface 2b are the same as those in the first embodiment, description thereof is omitted. The recess 2c is disposed on the surface of the base 2 and accommodates the protruding portions 42c and 42d. The recessed portion 2d is disposed on the back surface of the base portion 2 and accommodates the protruding portions 44c and 44d. The recesses 2c and 2d have holes for inserting penetrating members (bolts, pins, etc.). The recess 2c and the recess 2d are disposed so as to be adjacent to each other, and are disposed at positions corresponding to the bladed portion 42 and the bladed portion 44, respectively.

  The penetrating member (such as a bolt or a pin) passes through the recess 2c and the protrusions 42c and 42d, or passes through the recess 2d and the protrusions 44c and 44d. The projecting portions 42c, 42d, 44c, and 44d are fixed to the base portion 2 with the penetrating member. In addition, you may make it braze the protrusion parts 42c, 42d, 44c, 44d, and the base part 2. FIG.

According to the second embodiment of the present invention, the same effects as in the first embodiment can be obtained.
Furthermore, the protrusions 42c, 42d, 44c, and 44d are fitted into the recesses 2c and 2d, whereby the bladed portions 42 and 44 can be easily positioned.

  In addition, when the circular saw blade 1 is rotated to cut the object to be cut, a force that separates the bladed portions 42 and 44 from the base portion 2 acts. Here, since the protrusions 42c, 42d, 44c, and 44d are subjected to the reaction of the force for detachment from the recesses 2c and 2d, the bladed portions 42 and 44 are less likely to be detached from the base 2.

Moreover, since the projecting portions 42c, 42d, 44c, and 44d are fixed to the base portion 2 by the penetrating member, the bladed portions 42 and 44 are more firmly attached to the base portion 2 than in the case of the first embodiment. Fixed.
In addition, the circular saw blade 1 which abbreviate | omitted the penetration member is demonstrated as a modification of 2nd embodiment.

  FIG. 8 is a front view of the platform 2 according to a modification of the second embodiment of the present invention. FIG. 9 is a side view (FIG. 9 (a)) and a front view (FIG. 9 (b)) of a bladed portion 44 according to a modification of the second embodiment of the present invention.

  Since the penetrating member in the second embodiment is omitted, a hole for inserting the penetrating member is not opened in the base 2 or the bladed portion 44. The same applies to the bladed portion 42. Even in such a modification, for example, if the projecting portions 42c, 42d, 44c, 44d and the base portion 2 are brazed, the bladed portion 42 is more than the case of the first embodiment. 44 are more firmly fixed to the pedestal 2.

  In the above embodiment, the case of “brazing” has been described. However, instead of “brazing”, welding or bonding can also be performed.

Third Embodiment FIG. 17 is an assembled front view of a circular saw blade 1 according to a third embodiment of the present invention. 18 is a front view of the pedestal of FIG. FIG. 19 is a front view of the bladed portion. Note that the same reference numerals as those in the first embodiment denote the same parts, and a description thereof will be omitted.

As shown in FIG. 18, the shape of the pedestal 2 in the third embodiment is formed with a corrugated uneven portion 2 e along the circumferential direction at the outer peripheral end.
In addition, the uneven | corrugated | grooved part 2e is not limited to a sine wave shape, What kind of shape may be sufficient if it is a shape which enlarges the area of the outer peripheral end of the base part 2, such as a triangular wave.

  In addition, slits 2f are formed in the valley portions of the two uneven portions 2e following the predetermined interval (three wave intervals in the embodiment) of the uneven portion 2e. A small hole 2g is connected to the base end side of the slit 2f (on the shaft hole 2a side of the base 2). In the embodiment, two slits 2f are continuously formed. However, the number of slits 2f is not limited to two, and may be one or three or more. Further, the position where the slit 2f is connected to the concave and convex portion 2e may be a slope or a mountain portion of the concave and convex portion.

  The slit 2f is formed to prevent the base 2 from being deformed due to expansion and contraction due to a high temperature change that occurs when the bladed portion 5 described later is brazed or welded to the base 2. . Further, the small hole 2g is for preventing the cracks from being generated toward the shaft hole 2a of the base portion 2 due to the interval between the slits 2f being widened, so that the small hole 2g is necessarily required depending on the processing method. Not what you want.

  In the joint portion of the bladed portion 5 to be joined to the outer peripheral surface (uneven portion 2a) of the base portion 2 in the third embodiment, an uneven portion 5a that matches the uneven portion 2e is formed. The bladed portion 5 is formed with a blade portion 5b. The blade portion 5b is preferably formed after being integrated with the base portion 2 by brazing or the like.

  After the base part 2 and the bladed part 5 configured as described above are arranged on the outer peripheral surface of the base part 2 on the entire outer peripheral surface of the base part 2, the uneven part 5a of the bladed part 5 with respect to the concave and convex part 2e of the base part 2, They are integrated by means such as brazing. At the time of this integration, it is desirable to prevent the portion where the bladed portions 5 are in contact with each other from being positioned at the slit 2f.

  That is, when the contact portion of the bladed portion 5 is located at the same position as the slit 2f, the interval between the contact portions changes according to the change in the interval due to expansion and contraction of the slit 2f, and a gap may be generated in the blade portion 5b. Because.

  In addition, when integrating the said base part 2 and the bladed part 5, it is natural that the end surface of each bladed part 5 is also integrated by means, such as brazing. In addition, in this embodiment, the slit 2f has been described as releasing heat when the base portion 2 and the bladed portion 5 are integrated, but the slit 2f may be released by the recess 2b-2 shown in FIG. Further, it is not always necessary to release heat by the slit 2f or the depression 2b-2.

Fourth Embodiment FIG. 20 is an assembly front view of a circular saw blade 1 according to a fourth embodiment of the present invention. FIG. 21 is a front view of the pedestal of FIG. (A) in FIG. 22 is a front view of a part with a blade, (b) is a center longitudinal cross-sectional view. Note that the same reference numerals as those in the first embodiment denote the same parts, and a description thereof will be omitted.

  As shown in FIG. 21, the shape of the base part 2 in the fourth embodiment is formed on the outer peripheral edges of the front and back surfaces 21 and 22 of the base part 2 with the concave steps 21a and 22a having the same size along the outer peripheral edge. Are formed alternately. The end sides 21a-1 and 22a-1 of the recessed step portions 21a and 22a are directed toward the center of the shaft hole 2a of the base portion 2, respectively.

  The bladed portion 6 in the fourth embodiment is as shown in FIG. 22, and is formed integrally with a blade forming portion 6a having a thickness substantially the same as that of the base portion 2 and below the blade forming portion 6a. And a fitting portion 6b having a thickness substantially the same as the depth of the concave step portion 21a or 22a of the base portion 2 and a size that can be fitted into the concave step portions 21a and 22a.

  When the fitting portions 6b of the bladed portion 6 are alternately fitted into the concave steps 21a and 22a formed on the front and back of the base portion 2 thus configured, the blades of the adjacent bladed portions 6 are fitted. Since the side surface of the forming portion 6a is in contact, the contact surface between the recessed step portions 21a and 22a of the base portion 2 and the fitting portion 6b of the bladed portion 2 and the blade forming portion 6a of the adjacent bladed portion 6 The end surface is brazed and integrated by means such as welding or adhesion (see FIG. 20).

  By joining in this way, the joining area of the bladed portion 6 with respect to the pedestal 2 is increased, and the bladed portions 6 are also joined together, so that the bladed portion 6 is separated from the pedestal 2. It becomes possible to prevent more firmly. In this state, since the outer peripheral surfaces of the blade forming portions 6a of all the blade-attached portions 6 are concentric circles, the circular saw blade is completed by forming the blade portions in the blade forming portion 6a in this state.

  In addition, the base part 2 expands or contracts by heat when the bladed part 6 is integrated with the recessed step parts 21a and 22a formed on the base part 2 shown in FIGS. 21 and 22 by brazing or welding. In some cases, the joining with the bladed portion 6 cannot be performed firmly.

  Therefore, a recess 23 is provided between the recessed step portions 21a and 22a as shown in FIG. 23, and the bladed portion 6 is brazed to the recessed step portions 21a and 22a across the recess 23. It is desirable that the expansion or contraction of the pedestal 2 is released by welding so as to prevent a change in the shape of the circumferential surface.

  Next, a modification of the fourth embodiment will be described with reference to FIGS. FIG. 24 is an assembly front view. FIG. 25 is a front view of the pedestal of FIG. 26A is a front view of the bladed portion, FIG. 26B is a central transverse end view, and FIG. 26C is a central longitudinal end view. Note that the same reference numerals as those in the fourth embodiment denote the same parts, and a description thereof will be omitted.

  The only difference between this modification and the fourth embodiment is the difference in the shape of the bladed portion 6, and the recessed step portions 21 a and 22 a formed on the base portion 2 have the same shape.

  In the fourth embodiment, the engagement portion 6b is formed only below the blade forming portion 6a of the blade-attached portion 6 and the blade-attached portions 6 are attached to each other in the state where the blade-attached portion 6 is attached to the base portion 2. At the time of joining, only the left and right end faces of the bladed portion 6 are joined, but in this modification, the left and right fitting portions 6c are also formed on the left and right sides of the blade forming portion 6a of the bladed portion 6.

  The left and right fitting portions 6c formed on the left and right sides of the blade forming portion 6a are formed so that the thickness when the left and right fitting portions 6c are joined is substantially the same as the thickness of the blade forming portion 6a. ing.

  The fitting portion 6b of the bladed portion 6 thus configured is fitted into the recessed step portions 21a and 22a formed on the front and back of the base portion 2, and the left and right fitting portions 6c of the bladed portion 6 are made to face each other. In this state, the recessed step portions 21a, 22a, the fitting portion 6b, and the left and right fitting portions 6c are brazed and integrated by means such as welding and adhesion.

  In contrast to the integration of this modification and the integration of the fourth embodiment, in the modification, the bladed portions 6 are joined to each other by the left and right fitting portions 6c, whereas the fourth embodiment is used. Then, since it is performed between the side surfaces of the blade forming portion 6a in the bladed portion 6, the embodiment of the modified example has a larger bonding area and a larger bonding force between the bladed portions 6, and accordingly, the bladed portion with respect to the base portion 2 is attached. The fixed state of the part 6 is stronger than in the fourth embodiment.

  And after joining the bladed part 6 to the base part 2 as mentioned above, a circular saw blade is completed by forming a blade part in the outer periphery of the blade formation part 6a of the bladed part 6. FIG. In the fourth embodiment and the modification, the base 2 expands or contracts due to a temperature change during brazing or welding. Therefore, by providing the recess 23 like the base 2 in FIG. 23 described above, The expansion or contraction of the pedestal 2 can be released and the change in the shape of the circumferential surface can be prevented.

  In all the embodiments described above, if the thicknesses of the bladed portions 4, 5, 6 are the same as the thickness of the base portion 2, the cutting surface of the workpiece and the base portion 2 are rubbed and difficult to cut. Therefore, by making the thickness of the base portion 2 about 0.1 mm thinner than the bladed portions 4, 5, 6, a gap is generated between the workpiece and the base portion 2, and thermal expansion due to contact or Frictional heat and the like can be prevented, so that cutting can be performed smoothly and the cut surface can be formed beautifully.

DESCRIPTION OF SYMBOLS 1 Circular saw blade 2 Base part 2a Shaft hole 2c, 2d Concave part 21a, 22a Concave step part 23 Indentation 6 Bladed part 6a Blade formation part 6b Fitting part 6c Left-right fitting part

Claims (3)

A circular saw blade comprising a base portion that rotates around a shaft hole and a blade portion on the outer periphery, and a plurality of bladed portions that cover the outer periphery of the base portion,
The said base part is provided with the recessed step part which has the same magnitude | size on the front and back of the outer periphery alternately, and each said bladed part equips an inner periphery with the fitting part which corresponds to the said recessed step part. Yes, in the state where the fitting portion of the bladed portion and the concave stepped portion of the base portion, and the end surface of the adjacent bladed portion are brazed and integrated by welding, the concave stepped portion and the fitting portion A circular saw blade characterized in that the sum of the thicknesses is equal to the thickness of the stepped portion.   A thin portion is formed on the left and right end surfaces of each of the bladed portions, and the thickness in a state where the thin portions of the end surfaces of adjacent bladed portions are overlapped and integrated is equal to the thickness of the base portion. The circular saw blade according to claim 1, wherein   The circular saw blade according to claim 1 or 2, wherein a recess is formed in the concave step portion of the base portion that contacts the fitting portion of the bladed portion.

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