WO2017188480A1

WO2017188480A1 - Metal-cutting circular saw blade

Info

Publication number: WO2017188480A1
Application number: PCT/KR2016/004502
Authority: WO
Inventors: 김종국
Original assignee: (주)파워쏘
Priority date: 2016-04-29
Filing date: 2016-04-29
Publication date: 2017-11-02
Also published as: DE112016004555T5

Abstract

The present invention relates to a metal-cutting circular saw blade and, more specifically, to a circular saw blade mounted on a cutting device so as to cut a metal object to be cut, the metal-cutting circular saw blade comprising a cutting tip, for cutting, to which a lower front surface machined to be roundly recessed toward the rear thereof and a dented part formed by denting the rear end portions of both side surfaces thereof toward the inside of a cutting tip are introduced, thereby facilitating the discharge of cut chips during a cutting operation, reducing interference, which is received by the cutting tip through contact with the object to be cut, so as to improve the cutting performance and wear resistance of the circular saw blade and, simultaneously, being capable of preventing the cutting tip from breaking during the cutting operation.

Description

Circular saw blades for metal cutting

The present invention relates to a circular saw blade for cutting metal, and more particularly, in a circular saw blade mounted on a cutter to cut a to-be-cut material, which is cut round to be concave backward to a cutting tip for cutting. The lower front surface and the recessed portions in which the rear ends of both sides are recessed inside the cutting tip facilitate the discharge of the cutting chip during cutting operation, and reduce the interference of the cutting tip due to contact with the cutting object, The present invention relates to a circular saw blade for cutting metal, which can improve cutting and wear resistance and at the same time prevent breakage of the cutting tip during cutting operations.

In general, a circular saw blade has a cutting edge is formed along the circumferential edge is used for cutting or slotting various industrial materials such as metal pipes, iron plates, round bars, non-ferrous metals (Cu, Al, etc.).

Since the cutting blade of the circular saw blade cuts metal materials having a very high strength and hardness, a cutting tip for cutting metal is attached to the saw blade portion of the circular saw blade through high frequency welding, and the cutting tip is in direct contact with the metal material during the cutting operation. The surface is cut little by little, and the cutting object is cut.

Accordingly, the cutting tip is required to have a very high strength and hardness, so that the cutting tip is made of an alloy such as tungsten carbide to secure cutting and wear resistance.

However, as described above, since the cutting tip of the circular saw blade for metal cutting is mainly used to cut metal having very high strength and hardness, wear or breakage may occur due to repeated use even if the cutting tip is made of durable material. easy to do.

In particular, if the cutting chip generated during cutting operation does not discharge smoothly to the outside of the saw blade portion of the circular saw blade and the interference caused by the contact between the cutting tip and the cutting object occurs, the cutting tip is heavily loaded and the cutting tip strength is increased. Deterioration or abrasion or breakage of the cutting tip is likely to occur, and thus, the cutting surface of the cutting object is not beautiful, and thus, precision machining is difficult.

In order to solve the above problems, there is a Republic of Korea Patent No. 10-0923567 (2009.10.19.) Shown in Figure 1 "cutting saw blade of a circular saw blade for metal cutting", the registered patent body 110 The outer peripheral surface of the blade is formed with a curved curvature groove 122 is formed in a spherical shape in a spherical shape and connected to the tip seat portion 127 rounded in one direction to form a concave cutting edge 124, the tip of the blade The abdominal surface is provided with a tip 130 having a hemispherical concave cutting edge.

The patent has a resistance to the cutting edge by easily discharging the chip through the curvature groove, the abdominal surface is a hemispherical tip when the chips generated during the cutting operation is formed long rather than short cut. To reduce cutting efficiency and to prevent wear or break of the cutting edge.

However, in the circular saw blade for cutting metal, the cutting tip is made of cemented carbide or cermet, which is excellent in strength and hardness, and since the cutting tip is thicker than the thickness of the body, both sides of the cutting tip and the cutting object during the cutting operation Even if the contact and interference occurs a lot, even if it is easy to discharge the chip, as described in the patent, there is a problem that the wear or breakage of the cutting chip is easily generated as the effect of the load reduction is halved.

The present invention has been made to solve the above problems,

The cutting chips generated by cutting the cutting object during the cutting operation are easily discharged to the outside of the saw blade, and the interference of contact with the cutting object is minimized, so that the strength of the cutting tip is reduced or the cutting tip is worn or broken. It is an object of the present invention to provide a circular saw blade for cutting metal, wherein the lower front surface of the cutting tip is rounded to concave toward the rear so as to prevent it from being formed, and the recesses having recesses in which both rear end portions of the cutting tip are recessed inwardly. .

In addition, the present invention is to properly remove the pressure applied to the cutting tip during the cutting operation, at the same time, the attachment surface of the saw blade is attached to the rear surface of the cutting tip to prevent the cutting tip from being separated from the body of the circular saw blade An object of the present invention is to provide a circular saw blade for cutting metal which is formed to be inclined at -20 ° to -30 ° in a direction opposite to the rotation of the body with respect to the center line.

In addition, the present invention optimizes the angle at which the cutting edge of the cutting tip contacts the cutting object during the cutting operation, thereby improving the cutting rate and preventing the cutting edge from being worn or broken. It is an object of the present invention to provide a circular saw blade for cutting metal, the upper front surface of which is inclined toward the rear upper side from the cutting blade portion to be inclined in the rotational direction of the body by -20 ° to -30 °.

Furthermore, the present invention is formed such that the front sidewalls of the recesses are inclined toward the rear lower side at the front upper ends of both sides so as to improve the durability of the circular saw blade by minimizing the interference between the cutting tip and the cutting object while ensuring the strength of the cutting tip. It is an object of the present invention to provide a circular saw blade for cutting metal.

In addition, the present invention is the side surface of the front side wall and the body made of the inclined side inclined surface so that the recessed thickness of the front side wall in the center line, the cutting force is maintained and the circular saw blade to optimize the durability of the circular saw blade by minimizing the friction between the cutting object It is intended to provide.

In order to achieve the above object, the circular saw blade according to the present invention is provided with a saw blade portion along the circumferential side; And

Is attached to the saw blade portion, the cutting tip is formed with a cutting edge portion in the front upper end in the rotational direction of the body;

The cutting tip is

The lower front surface is connected to the cutting edge portion is formed rounded to concave toward the rear,

The rear ends of both sides may include a depression formed by being recessed into the cutting tip.

And in the circular saw blade according to the present invention, the attachment surface of the saw blade is attached to the back of the cutting tip is characterized in that it is formed to be inclined -20˚ ~ -30˚ in the opposite direction of rotation of the body with respect to the centerline of the body do.

In addition, in the circular saw blade according to the present invention, the cutting tip includes an upper front surface connected to the cutting edge portion and formed to be inclined toward the rear upper side, wherein the upper front surface is centerline of the body when the cutting tip is attached to the saw blade portion. It is characterized in that it is formed to be inclined -20˚ to -30˚ in the rotation direction of the body on a horizontal line perpendicular to the horizontal.

Further, in the circular saw blade according to the present invention, the cutting tip is characterized in that the front side wall of the depression is formed to be inclined toward the rear lower side at the front upper end of both sides.

In addition, the present invention is characterized in that the front side wall and the side of the body formed a side slope inclined so that the recessed thickness of the front side wall in the center line becomes thin.

The circular saw blade according to the present invention has a lower front surface rounded to concave toward the rear, and the cutting chip generated during the cutting operation by introducing a cutting tip including a recess formed by recessing the rear end portions of both sides to the inside of the circular saw blade It can be easily discharged to the outside of the cutting tip to reduce the load on the cutting tip, and to minimize the contact between the cutting tip and the cutting object to reduce the interference to prevent wear and break of the cutting tip, thereby improving the durability of the circular saw blade. Can be.

In particular, the circular saw blade according to the present invention is reduced in reworking or replacement of the cutting tip as the durability is improved, thereby reducing the cost burden, while reducing the strength and hardness of the cutting edge portion, improving the cutting property and wear resistance of the circular saw blade It is a very useful invention with very effective.

In addition, the circular saw blade according to the present invention is formed so that the attachment surface of the saw blade is attached to the back of the cutting tip is inclined -20˚ ~ -30˚ in the opposite direction of rotation of the body with respect to the center line of the body so that the pressure applied to the cutting tip It is possible to reduce and prevent the cutting edge portion of the cutting tip from breaking, and at the same time, the cutting tip can be prevented from being separated from the saw blade portion of the body.

Furthermore, the circular saw blade according to the present invention is formed so that the upper front surface connected to the cutting edge is inclined at -20˚ to -30˚ in the rotational direction of the body at a horizontal line perpendicular to the centerline of the body, so that the cutting edge is in contact with the cutting object. Since cutting is performed while entering the optimum angle, the cutting efficiency is excellent and the cutting surface is beautiful, which is a very advantageous invention for precision machining.

In addition, the circular saw blade according to the present invention is formed so that the front side wall is inclined toward the rear upper side at the front upper end of both sides so that when the cutting tip is attached to the saw blade, the front side wall of the depression is made at an angle corresponding to the center line of the body Therefore, the durability of the entire circular saw blade is improved by ensuring the strength of the cutting tip and minimizing the interference between the cutting tip and the cutting object.

In addition, the present invention is the side surface of the front side wall and the body made of the inclined side inclined surface so that the recessed thickness of the front side wall in the center line, the cutting force is maintained and the circular saw blade to optimize the durability of the circular saw blade by minimizing the friction between the cutting object to provide.

1 is a view for explaining a conventional circular saw blade.

2 is a partially perspective and enlarged perspective view of the circular saw blade according to the present invention.

Figure 3 is a side view and main portion enlarged side view of a circular saw blade according to the present invention.

4 is a perspective view, a plan view, a side view of a cutting tip in a circular saw blade according to the present invention.

5 and 6 are enlarged side views of main parts in a circular saw blade according to the present invention.

* S: circular saw blade, 10: body, 11: saw blade, 12: tooth, 13: mounting surface, 20: cutting tip, 21: body, 22: cutting edge, 23: lower front, 24: upper front, 25: Side, 25A: depression, 25a: front side wall, 25b: side slope, 26: rear, 27: bottom

Circular saw blade according to the present invention, the body is provided with a saw blade along the circumferential side; And a cutting tip attached to the saw blade portion and having a cutting blade portion formed on an upper end portion thereof in a rotational direction of the body. The cutting tip includes a recess formed by recessing the rear ends of both sides into the cutting tip, and the lower front surface connected to the cutting edge is rounded to concave toward the rear, and the cutting edge is flat toward the rear lower side. The inclined surface is inclined and connected to the round portion to have a surface, wherein the forming angle of the inclined surface is formed to be inclined 7˚ ~ 11˚ in the direction of rotation of the body with respect to the centerline of the body when the cutting tip is attached to the saw blade portion The first attaching surface of the saw blade portion to which the rear surface of the cutting tip is attached is formed to be inclined at -20 ° to -30 ° in a direction opposite to the rotation of the body with respect to the center line of the body. The front side wall of the depression is formed to be inclined toward the rear lower side at the front upper ends of both sides, and the inclination of the front side wall Forms an angle with the center line formed to be parallel to the front side wall and the body side, so that the depression of the front side wall thickness thinner from the center line of the oblique side inclined surface of the body when the cutting tip is attached to the saw blade section.

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In each of the drawings, the same reference numerals, in particular, the tens and ones digits, or the same digits, tens, ones, and alphabets refer to members having the same or similar functions, and unless otherwise specified, each member in the figures The member referred to by the reference numeral may be regarded as a member conforming to these criteria.

In addition, in the drawings, the components are exaggerated in size (or thick) in size (or thick) in size (or thin) or simplified in consideration of the convenience of understanding and the like, thereby limiting the scope of protection of the present invention. It should not be.

The terminology used herein is for the purpose of describing particular embodiments (suns, aspects, and embodiments) (or embodiments) only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms “comprises” or “consists” are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In the present specification, the first to second and the second to refer to different components are not limited to the order of manufacture, and their names are used in the detailed description and claims of the present invention. May not match.

In describing the circular saw blade for cutting metal according to the present invention, for the sake of convenience, a non-strict approximate direction reference is specified with reference to FIGS. 2 and 3, and the direction in which gravity acts downward is as shown in the up, down, left, and right directions. In accordance with the description, the front and the left, the rear and the right side are mixed and described according to the description, and the front and rear sides of the body 10 in which the cutting edge portion 22 is positioned at the cutting tip are set forward and backward. In the description and in the claims, unless otherwise indicated, directions are specified in accordance with this standard.

Hereinafter, a circular saw blade for cutting metal according to the present invention will be described with reference to the accompanying drawings.

First, as shown in Figures 2 and 3, the circular saw blade (S) according to the present invention is largely mounted on a cutter or the like attached to the circumferential side of the rotating body 10 and the body 10 is fixed substantially to cut It consists of a cutting tip 20 to perform.

The body 10 is a circular member having a predetermined thickness, the saw blade portion 11 is formed along the outer circumferential side, the cutting tip 20 is attached to the saw blade portion 11 through high frequency welding or the like in one direction As the cutting blade 22 of the cutting tip 20 comes into contact with the cutting object (not shown) as it rotates in a counterclockwise direction on the drawing, cutting is performed by cutting the surface of the cutting object little by little.

To this end, a mounting hole 15 is provided at the center of the body 10 to be mounted on a cutter, and a saw blade fixing pinhole 16 for preventing the flow of the circular saw blade during the cutting operation is provided around the mounting hole 15. A plurality is provided.

In addition, although not shown in the drawings, the side of the body 10 may be further provided with an incision line (not shown) that can prevent deformation of the circular saw blade (S) due to heat generation, in addition to the saw blade portion ( 11 is a cutting groove for providing a predetermined elasticity to the body 10 to minimize the damage to the teeth 12 by absorbing some of the stress applied to the teeth 12 of each of the saw blade portion 11 during the cutting operation ( A plurality of not shown) may be formed at regular intervals.

The incision line or the incision groove or both may be made in a variety of shapes, typically by a predetermined length in the inward direction toward the mounting hole 15 in the center of the body 10 from the tooth 12 and the tooth 12 It is preferably formed in an extended form, the end of which is made of a round groove.

2 and 3, the saw blade portion 11 is formed with a plurality of teeth 12 spaced apart at predetermined intervals along the circumferential side of the body 10, the saw tooth 12 and The end portion 12A of the saw blade portion 11 connecting the teeth 12 has a similar hemispherical shape that is 1/2 to 1/4 of 360 ° so as to be continuous with the round portion 23A of the cutting tip 20 which will be described later. Is produced.

That is, the tooth 12 is formed to be inclined toward the outside (upper) based on the rotation direction of the body 10, the mounting surface portion 13 bent at an angle of 90 ° to the front end of the tooth 12 is Formed,

The end portion 12A leading from the second attachment surface 13B constituting the mounting surface portion 13 to the other teeth 12 in front is machined into a similar hemispherical shape so as to concave toward the center of the body 10 so that a plurality of teeth ( 12 is formed to be continuously rounded toward the rotational direction of the body 10 along the circumferential side of the body 10 to form a saw blade portion (11).

Subsequently, as shown in FIGS. 2 and 3, the cutting tip 20 is a member made of a body having a similar rectangular shape 21 having a thickness thicker than that of the body 10, and in the direction of rotation of the body 10. Cutting edge portion 22 is formed on the front upper end of the body (21).

The cutting tip 20 is made of any one of the cemented carbide or cermet cemented carbide or cermet cemented carbide combined with the whole body 21, or a part including the cutting blade 22 is described above Both forms can be made of any one material, and in some cases, it is possible to secure durability, that is, cutting property and wear resistance, of the cutting edge part 22 by a special coating method using the above-described material.

Cemented carbide is a mixture of carbides and tough metals with high hardness and is located in the intermediate properties of high-speed steel materials with high toughness and ceramics with high temperature. Therefore, it has both hardness and some toughness, which are important properties for tool materials. Therefore, it is widely used as a tool for metal cutting, wear-resistant parts and mold materials.

Cermet uses TiC-Ni-Mo cemented carbide that does not contain WC in the cutting edge material. The cermet tool combines the toughness and plasticity of the metal with the hardness, wear resistance, acid resistance and chemical resistance of the ceramic.

In addition, the cermet cemented carbide, which combines cemented carbide and cermet with 50:50 intermediate material, constitutes only the advantages of cemented carbide and cermet, and maximizes the characteristics of metal, which has high temperature strength, excellent oxidation resistance, and low coefficient of friction. It is a material with more than twice the speed and excellent surface roughness.

The material of the cutting tip 20 is preferably selected in consideration of advantages and disadvantages according to the type or cutting shape of the cutting object or the requirements of the user.

Referring to FIGS. 2 to 4, the cutting tip 20 will be described in more detail. The cutting edge portion 22 is formed at the upper end of the front surface 23 of the body 21 (the surface facing the rotation direction of the body 10). It is provided in a pointed shape toward the front, and the rear surface 26 and the lower surface 27 are fixed to the first and second attachment surfaces 13A, 13B of the saw blade portion 11 by high frequency welding or the like. do.

The cutting tip 20 is rounded so that the lower front surface 23 connected to the cutting blade 22 is concave toward the rear, thereby connecting the teeth 12 and the teeth 12 of the saw blade portion 11. The end portion 12A is formed to be continuous with the round portion 23A of the lower front surface 23.

Therefore, the cutting chip generated by cutting the surface of the cutting object by the cutting blade 22 is guided to the lower front surface 23 which is rounded, so that the cutting chip (not shown) is easily discharged, and the cutting chip is pressed. Since no sticking occurs, wear or breakage of the cutting tip 20, in particular, the cutting edge part 22, may be reduced, thereby maintaining a consistently high cutting efficiency.

In addition, both side surfaces 25 of the body 21 constituting the cutting tip 20 includes a recessed portion 25A formed by recessing the rear end toward the inside of the cutting tip 20.

The recessed portion 25A reduces the area where both side surfaces 25 of the body 21 come into contact with the processing portion of the cutting object during the cutting operation, thereby minimizing interference during the cutting operation, thereby minimizing wear or breakage of the cutting tip 20. In this case, the polishing amount of the cutting tip 20 can be reduced during the operation of improving and maintaining the hardness of the cutting edge part 22 by regrinding only the cutting tip 20.

4, the upper portion of the lower front surface 23, that is, the upper portion of the lower front surface 23 connected to the cutting edge part 22 is not rounded to be curved backwards, but toward the rear lower side. It is possible to reinforce the strength of the cutting edge portion 22 by forming the inclined surface 23B inclined to have a flat surface.

That is, since the cutting edge portion 22 of the cutting tip 20 has a sharp tip as the tip thereof goes up, the upper and lower thicknesses of the body 21 become narrower as the cutting edge portions 22 become curved, so that the entire lower front surface 23 is curved. When the round portion is formed of a round portion 23A '(first embodiment), since the upper and lower thicknesses at the tip are formed particularly thinly by the shape of the round portion, the strength is lowered and the body including the cutting edge portion 22 during the cutting operation ( 21) There is a possibility of damage such as breaking of the front part of the

According to the present invention, the upper portion of the lower front surface 23 is formed as an uncurved flat inclined surface 23B (second form), so that the overall shape of the lower front surface 23 is rounded to concave toward the rear to form a cutting chip. Discharge is easy, but a portion of the body 21 connected to the cutting edge 22, in particular the end portion is thinner toward the cutting edge 22 is formed to have a predetermined thickness or more, thereby preventing the strength degradation as described above.

FIG. 6 is a partially enlarged view of the first and second shapes by cross-sectional view, and the difference in thickness of the portion connected to the cutting edge part 22 may be confirmed due to the difference in shape.

At this time, as shown in Figure 5, the angle of formation of the inclined surface (23B) in consideration of the shape of the rounded front so that the lower front surface 23 is concave toward the rear and the tip thickness of the cutting edge portion 22, the cutting tip 20 ) Is attached to the saw blade portion 11 is preferably formed to be inclined 7 ° to 11 ° in the rotational direction (front) of the body 10 with respect to the center line (L1) of the body (10).

The formation angle A2 of the said inclined surface 23B is determined in consideration of the formation angle of the 1st attachment surface of the saw blade part 11 mentioned later.

2 to 4, the front side wall 25a forming the depression 25A is formed to be inclined toward the rear lower side at the front upper ends of both side surfaces 25 of the body, thereby cutting the tip 20. It is manufactured in an optimized form to disperse and offset the load generated during cutting operation while maintaining the strength of).

That is, in the present invention, the thickness of the rear end portion of the body 21 is thinner than the front portion due to the depression 25A, and the rear lower edge portion having the thick front portion facing the upper front edge portion of the cutting tip 20 is formed. That is, formed to be inclined toward the corner portion that the rear surface 26 and the lower surface 27 of the cutting tip is connected,

In the region of the body 21 having the same height as the cutting edge portion 22, which is substantially cut, the cutting portion 25A causes only minimal contact (interference) with the cutting object and the cutting is substantially performed. By thickening the region of the body 21 leading to the lower portion of the uncut cutting edge portion, it is possible to ensure the overall strength of the cutting tip 20.

The front side wall 25a may be formed so that the front end portion of the body 21 connected to the cutting edge portion 22 is thicker than the rear end portion. Therefore, the inclination angle of the front side wall 25a is a cutting tip (to be described later). 20) is determined in consideration of the attachment angle.

The front side wall 25a and the side surface 25 of the body 10 may form a sloping side surface 25b so that the recessed thickness of the front side wall 25a becomes thinner at the center line L1.

In addition, as shown in Figure 5, the cutting tip 20 is formed so that the upper front surface 24 connected to the cutting edge portion 22 is inclined toward the rear upper side from the cutting edge portion 22,

The inclination angle A1 of the upper front surface 24 is relative to the horizontal line L2 perpendicular to the centerline L1 of the body 10 when the cutting tip 20 is attached to the saw blade portion 11. It is characterized in that it is formed to be inclined -20˚ ~ -30˚ in the rotation direction of the body (10).

The side surface 25 between the inclined surface 23B, which is the lower portion of the upper front surface 24, and the center line L1 may have a plane perpendicular to the cutting edge portion 22.

That is, the upper front surface 24 (edge portion) connected to the cutting edge portion 22 is inclined toward the front lower side at the rear end, thereby forming the tip portion of the cutting edge portion 22 together with the inclined surface 23B. Since the cutting tip 20 is attached to the saw blade portion 11 while being inclined toward the rear side (to be described later), the cutting edge portion 22 is formed to be inclined to face the front lower side so that the cutting blade portion 22 is formed in the body ( 10) to improve the cutting efficiency by matching with the rotational direction, and the space formed by the upper front surface 24 serves to reduce the contact load with the cutting object.

And the corner portion connecting the rear surface 26 and the lower surface 27 of the cutting tip body 21 is formed by the inclined incision surface 27a cut at an inclined angle of a predetermined angle of the cutting tip body 21 when viewed from the side direction The overall shape is made of a polygonal shape, when the cutting tip 20 is welded and attached to the mounting surface portion 13 to be described later to increase the welding area to strengthen the adhesive force, in particular the body by contact with the cut object during the cutting operation The pressure applied in the opposite direction of rotation of the 10 is dispersed and offset by the lower surface 27, the inclined cutting surface 27a, and the rear surface 26 of the cutting tip 20, respectively, so that the cutting tip 20 is the body 10. To prevent separation and separation from the saw blade portion 11 of the.

Meanwhile, as shown in FIGS. 2 and 3, the body 10 of the present invention includes a mounting surface 13 to which the cutting tip 20 is welded and attached to each tooth 12 of the saw blade portion 11. The mounting surface portion 13 includes a first attachment surface 13A in contact with the rear surface 26 of the cutting tip 20, and a second attachment surface 13B in contact with the lower surface 27 of the cutting tip 20. And a third attachment surface 13C in contact with the inclined incision surface 27a.

In addition, the first attachment surface 13A of the saw blade portion 11 to which the rear surface 26 of the cutting tip 20 is attached is opposite to the rotation of the body 10 with respect to the center line L1 of the body 10. It is formed so as to incline -20˚ ~ -30˚ in the direction.

Therefore, when the cutting tip 20 of the present invention is attached to the saw blade portion 11 by welding, the cutting tip 20 itself is attached while being inclined to the rear (the opposite direction of rotation of the body 10), and thus the cutting tip 20, the cutting edge 22 protrudes toward the rotational direction of the body 10 while the inclination angle of the body 20 and the inclination (tilt) angle of the upper and lower front surfaces 23 of the body 21 are combined. The optimal angle is derived.

This is because when the inclination angle A3 of the first attachment surface 13A is smaller than 20 ° (that is, the cutting edge portion 22 of the cutting tip 20 is attached and fixed to be more inclined toward the front lower side unlike the drawing) When the contact load is concentrated on the part of the body 21 where the cutting blade part 22 is formed during the cutting operation, breakage of the head part (commonly referred to as neck break) is likely to occur.

When the inclination angle A3 of the first attachment surface 13A is greater than 30 ° (that is, when the cutting edge portion 22 of the cutting tip 20 is attached and fixed to be inclined further toward the rear upper side unlike the drawing) The contact load is not transmitted to the body 10 during the cutting operation and is not solved. The contact load acts in the direction corresponding to the mounting angle of the cutting tip 20 (that is, the cutting edge 22 is generated when the cutting object 22 is in contact with the surface of the cutting object). Due to the pressure acting in the direction coinciding with the inclination angle of the first attaching surface 13A), the welded part is broken and the cutting tip 20 itself is easily separated and detached from the saw blade portion 11. to be.

In addition, the inclination angle of the front sidewall 25a, that is, the inclination angle of the front sidewall formed to be inclined from the upper left to the lower right in the drawing is the body 10 when the cutting tip 20 is attached to the saw blade portion 11. It is more preferable in view of the strength reinforcement of the body to be formed parallel to the center line (L1).

That is, the thickness of the front and rear of the body 21 is changed by the front sidewall 25a of the cutting tip 20,

When the cutting tip 20 is attached to the saw blade portion 11, when the upper end portion of the front side wall 25a is formed to be inclined downward leftward in the drawing, the thickness of the portion where the cutting blade portion 22 is formed becomes thin, which may cause damage. Can grow,

On the contrary, when the cutting tip 20 is attached to the saw blade portion 11, if the upper end portion of the front side wall 25a is formed to be inclined downward rightward in the drawing, the area of the portion that does not interfere through the depression 25A. Since this can be narrowed (i.e., the area of the thick portion where the depression is not formed becomes wider),

The front side wall 25a is formed to be inclined toward the front upper part at the rear end of the inclined incision surface 27a, and when the cutting tip 20 is attached, the front side wall 25a is formed with the center line L1 of the body 10. If formed to be parallel, a suitable strength guarantee and interference reduction function can be implemented.

In addition, the front side wall (25a) and the side surface 25 of the body 10 forms a side inclined surface (25b) inclined so that the recessed thickness of the front side wall (25a) in the center line (L1), the upper front surface (24) The side surface 25 between the inclined surface 23B and the center line L1, which is a lower portion of the surface, forms a plane orthogonal to the cutting edge portion 22. The side surface 25 is parallel to the cutting edge portion 22 to the centerline L1. To maintain cutting strength, and the side sloped surface 25b from the center line L1 to the front side wall 25a has the width of the front side wall 25a such that the width of the front side wall 25 is close to the depression 25A. In order to reduce the inclination, the width between both side slopes 25b forms an inclined surface that decreases toward the front side wall 25a, so that the contact load with the cutting object is reduced and the strength of the cutting edge 22 is maintained. It also enables stable saw blade work.

The inclination angle of the first attachment surface 13A is a factor for determining the final inclination angle of the cutting tip 20, and the first inclination angle of the first attachment surface 13A should be preceded by the highest priority in determining the machining angle for each part of the cutting tip 20. It is an important factor.

In the present specification, for the convenience of description, the forming angles of the respective parts of the cutting tip 20 have been individually described. However, when the circular saw blade S is manufactured, the angle processing of each of the cutting tips 20 is performed by the cutting tip 20. Obviously, the final angle to be attached is determined in consideration of the overall angle. Therefore, the form of the mounting surface portion 13 (that is, the angle at which the first and second attachment surfaces 13A and 13B are formed at right angles of 90 degrees) is obvious. Is the angle of formation of the first and second attachment surfaces 13A and 13B less than 90 °, or is the angle of formation of the first and second attachment surfaces 13A and 13B greater than 90 °? After the angle determination of the first attachment surface 13A is preceded by the obtuse shape, the angles of the respective portions of the cutting tip 20 are comprehensively considered based on when the cutting tip 20 is finally attached. To be made within the above-described angle range.

That is, in order to secure the adhesion strength of the cutting tip 20 and the convenience of welding, the first and second attachment surfaces 13A and 13B and the rear surface 26 and the lower surface 27 of the cutting tip 20 are formed. It is more preferable that the forming angle (that is, the rear lower end shape of the cutting tip body 21) is manufactured at right angles of 90 °, but if the overall shape of the cutting tip body 21 is polygonal in the lateral view, Therefore, when the body 21 is introduced in the shape of the rear lower end portion is not a right angle, it is to be processed within the above-described angle range in consideration of the forming angle for each part that is different at the time of final attachment depending on the shape of the body 21.

In the above description of the present invention, a circular saw blade for cutting metal having a specific shape and structure has been described with reference to the accompanying drawings, but the present invention can be variously modified, changed and replaced by those skilled in the art. Substitutions should be construed as falling within the protection scope of the present invention.

The circular saw blade for cutting metal according to the embodiment of the present invention is easy to discharge the cutting chip during the cutting operation, and to reduce the interference received by the cutting tip when contacting the cutting object to improve the machinability and wear resistance of the circular saw blade and At the same time, the cutting tip can be prevented from being broken during the cutting operation, and thus can be usefully used in the cutting processing field.

Claims

Body 10 is provided with a saw blade portion 11 along the circumferential side; And

A cutting tip (20) attached to the saw blade portion (11) and having a cutting blade portion (22) formed at an upper end of the front surface in a rotational direction of the body (10);

The cutting tip 20,

The rear ends of both side surfaces 25 include depressions 25A formed by being recessed into the cutting tip 20.

The lower front surface 23 connected to the cutting edge portion 22 is

Rounded round portions 23A to concave toward the rear,

It is composed of the inclined surface (23B) connected to be inclined with the round portion (23A) to have a flat surface from the cutting edge portion 22 toward the rear lower side,

The angle of formation of the inclined surface 23B is 7 ° to 11 ° in the rotational direction of the body 10 with respect to the center line L1 of the body 10 when the cutting tip 20 is attached to the saw blade portion 11. It is formed to be inclined,

The first attachment surface 13A of the saw blade portion 11 to which the rear surface 26 of the cutting tip 20 is attached is opposite to the rotational direction of the body 10 with respect to the center line L1 of the body 10. Are inclined to -20˚ ~ -30˚,

The cutting tip 20 is formed so that the front side wall 25a of the depression 25A is inclined toward the rear lower side at the front upper ends of both side surfaces 25,

The inclination angle of the front side wall 25a is formed to be parallel to the center line L1 of the body 10 when the cutting tip 20 is attached to the saw blade portion 11,

The front side wall 25a and the side surface 25 of the body 10 are circular for metal cutting, characterized in that they form an inclined side surface 25b so that the recessed thickness of the front side wall 25a becomes thinner at the center line L1. saw blade.
The method of claim 1,

The cutting tip 20 includes an upper front surface 24 connected to the cutting edge portion 22 and inclined toward the rear upper side,

The inclination angle of the upper front surface 24 is the body 10 at a horizontal line L2 orthogonal to the center line L1 of the body 10 when the cutting tip 20 is attached to the saw blade portion 11. Circular saw blade for cutting metal, characterized in that formed to be inclined -20˚ ~ -30˚ in the direction of rotation.
3. The circular saw blade for cutting metal according to claim 2, wherein the side surface 25 between the inclined surface 23B, which is the lower part of the upper front surface 24, and the center line L1 has a plane perpendicular to the cutting edge portion 22. .