Assembly-type double saw blade

Abstract

The present invention relates to an assembly-type double saw blade and a double saw blade assembly which are tools capable of performing cutting and chamfering simultaneously and, in particular, are configured as assembly-type tools and thus able to form various chamfer angles according to properties of a base material, and can be selectively replaced. More specifically, the assembly-type double saw blade includes: a cutting part that has a disc shape with a through-hole at the center and includes cutting edges on the outer circumferential surface; and a pair of chamfering parts that have a disc shape with a through-hole corresponding to the center of the cutting part and are coupled so as to be in facing contact with both sides of the cutting part, wherein chamfering edges formed on the outer circumferential surfaces of the chamfering parts form inclined surfaces toward the cutting edges. The cutting part includes a stepped region that is recessed to a certain thickness from the inner surface of the cutting edges, and the chamfering parts are coupled such that the chamfering edges are located inward of the stepped region.

Description

Assembled double blade

[0001] The present invention relates to an assembled double saw blade, and more particularly, to an assembled double saw blade that is capable of performing cutting and chamfering simultaneously, and is formed so as to be assembled and separated from each other.

[0002]

[0003] A circular saw is a tool that cuts metal and non-metal materials by having multiple blades arranged on the edge of a disk-shaped body, and the central axis receives power from a power source such as a motor to rotate the circular saw rapidly.

[0004] At this time, the cut workpiece may require improvement work to process the cut edge into a specific shape depending on the purpose or type of work, and the improvement work can be performed by chamfering the cut surface to make it inclined.

[0005] Typically, after cutting the workpiece using a cutting tool, a separate chamfering tool is used to chamfer all cut edges. This method has limitations, as it requires at least a cutting tool and a chamfering tool. Furthermore, chamfering is a separate process performed on each cut edge, which is time-consuming and requires skilled operators to achieve specific angles.

[0006] To improve this, there is a method to shorten the process by manufacturing a tool in which the cutting tool and the beveling tool are formed as one piece, thereby performing beveling on the cut portion at the same time.

[0007] However, in the case of the integral type, there are restrictions on the angle at which the saw blade can be made. Therefore, if the chamfering needs to be formed at various angles depending on the characteristics of the base material, there is a limitation that multiple integral tools must be manufactured and used according to each characteristic. Furthermore, depending on the type of work, the amount of wear on the cutting and chamfering parts may differ. Therefore, if a problem occurs with either the cutting or chamfering blade, the entire blade must be replaced, resulting in unnecessary costs.

[0008]

[0009] The present invention has been made to solve the above problems, and the purpose of the present invention is to provide an assembled double saw blade capable of performing cutting and chamfering simultaneously by configuring teeth as an integrated unit in which a cutting saw blade for performing cutting and a chamfering saw blade for performing chamfering are combined, and each cutting saw blade and chamfering saw blade is configured as an assembled type, so that the cutting saw blade or the chamfering saw blade can be selectively partially replaced depending on the amount of wear, the type of work, and the need, thereby providing an assembled double saw blade that can provide convenience of use, efficiency of work, and cost reduction.

[0010]

[0011] In order to solve the above-described problem, an assembled double saw blade according to an embodiment of the present invention comprises a cutting part having a circular shape including a hole in the center and a cutting blade on the outer circumference thereof, and a pair of chamfering parts formed on the outer circumference of a circular shape including a hole corresponding to the center of the cutting part, the chamfering blade forming an inclined surface toward the cutting blade and being joined to opposite sides of the cutting part, wherein the cutting part includes a step recessed by a predetermined thickness on the inner circumference of the cutting blade, and the chamfering part is characterized in that the chamfering blade is positioned inside the step and joined.

[0012] At this time, the cutting edge is characterized by a tapered shape in which the thickness gradually becomes thinner along the radial direction from the outer surface to the step.

[0013] In addition, the chamfering blade is characterized by forming a sloped surface in such a way that the outer diameter of one side in contact with the cutting portion is larger than the outer diameter of the other side not in contact with the cutting portion.

[0014] Additionally, the outer diameter of the chamfering edge is characterized by being smaller than the inner diameter of the cutting edge.

[0015] And, the cutting part is characterized in that the inner side in the radial direction from the step forms a settling part with the same thickness, and a chamfer is joined to the settling part.

[0016] At this time, the assembled double saw blade is characterized in that the mounting portion and the chamfering blade are tightly coupled by a predetermined gap formed between the center of the cutting portion and the center of the chamfering portion facing each other.

[0017]

[0018] At this time, the cutting portion includes a first protruding portion having a certain diameter and protruding outward from the settling portion to a certain height, the chamfering portion includes a second protruding portion protruding toward one surface of the cutting portion to a certain height at a position corresponding to the first protruding portion, and the gap is characterized in that it is formed between the first protruding portion and the second protruding portion facing each other.

[0019] In addition, the chamfering portion includes a recessed portion that is recessed to a certain height between the second protruding portion and the chamfering blade, and the height of the recessed portion is characterized by being greater than the sum of the heights of the first protruding portion and the second protruding portion.

[0020] In addition, the assembled double saw blade is assembled by a joining means that is inserted into the through hole of the cutting part and the through hole of the chamfering part together and joins the cutting part and the chamfering part, and the joining means is characterized in that it assembles by pressing a pair of chamfering parts in the direction of the cutting part so as to eliminate a gap.

[0021]

[0022] The assembled double saw blade of the present invention having the above configuration can simplify the process of processing a workpiece by configuring the double saw blade so that cutting and chamfering can be performed simultaneously, and the cutting blade and the chamfering blade can be partially replaced depending on the amount of wear, so that maintenance of the device can be easy and the cost can be reduced, and since a part of the chamfering blade is configured to be covered by a step, the problem of foreign substances being caught during cutting can be prevented, so that the problem of the double saw blade working due to foreign substances can be solved, and when the saw blade is configured in an assembled form, it includes a structure that can be assembled while reinforcing the bonding force, so that it has the effect of providing ease of assembly and stability of the device.

[0023]

[0024] Figure 1 is a perspective view of an assembled double saw blade according to one embodiment.

[0025] Figure 2 is an exploded perspective view of an assembled double saw blade according to one embodiment.

[0026] Figure 3 is a partially enlarged view of an assembled double saw blade according to one embodiment.

[0027] Figure 4 is a cross-sectional view of an assembled double saw blade according to one embodiment.

[0028] Figure 5 is an enlarged cross-sectional view of an assembled double saw blade according to one embodiment.

[0029] Figure 6 is a configuration diagram of an assembled double saw blade according to an embodiment.

[0030]

[0031] The above-described objects, features, and advantages of the present invention will become more apparent through the following examples taken in conjunction with the accompanying drawings. The specific structural and functional descriptions below are merely illustrative for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and should not be construed as limited to the embodiments described in this specification or application. Since embodiments according to the concept of the present invention may have various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit embodiments according to the concept of the present invention to specific disclosed forms, but should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention. Terms such as first and / or second may be used to describe various components, but the components are not limited to the terms. Terms are used solely for the purpose of distinguishing one component from another; for example, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component, without departing from the scope of the rights according to the concept of the present invention. When a component is referred to as being connected or connected to another component, it should be understood that it may be directly connected or connected to that other component, but there may also be other components in between. Conversely, when a component is referred to as being directly connected or directly connected to another component, it should be understood that there are no other components in between. Other expressions used to describe the relationship between components, such as "between," "directly between," "adjacent to," and "directly adjacent to," should also be interpreted similarly.The terminology used herein is used solely to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. It should be understood that the terms "comprise" and "have" used herein indicate the presence of a described feature, number, step, operation, component, part, or combination thereof, and do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein. Hereinafter, the present invention will be described in detail by describing a preferred embodiment of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing represent the same parts.

[0032]

[0033] The assembled double saw blade (1000) of the present invention relates to a saw blade capable of cutting a workpiece such as a pipe or a specimen and chamfering the cut surface at the same time. Due to this configuration, it is formed as an assembled integral body capable of performing cutting and chamfering simultaneously, thereby providing an effect of shortening the process process and time. At this time, the saw blade of the present invention is characterized in that the cutting part (100) that performs cutting and the chamfering part (200) that performs chamfering are configured in a structure that can be assembled with each other, and thus the cutting part (100) and the chamfering part (200) are characterized in that they are selectively replaceable. That is, the assembled double saw blade (1000) of the present invention is characterized in that the cutting parts (100) and the chamfering parts (200) of saw blades of different shapes are formed in a form that can be assembled.

[0034] Accordingly, referring to FIGS. 1 and 2, the present invention relates to an assembled double saw blade (1000) including a cutting part (100) having a circular shape including a hole (150) in the center and a cutting blade (110) on the outer circumference thereof, and a chamfering blade (210) formed on the outer circumference of a circular shape including a hole (240) corresponding to the center of the cutting part (100) to form an inclined surface (211) toward the cutting blade (110), and a pair of chamfering parts (200) that are joined while facing each other on both sides of the cutting part (100), wherein the cutting part (100) includes a step (120) that is recessed by a predetermined thickness on the inner circumference of the cutting blade (110), and it is preferable that the chamfering blade (210) is positioned inside the step (120) and joined to the chamfering part (200).

[0035]

[0036] Referring to FIGS. 1 and 2, the cutting portion (100) of the present invention is characterized by being a saw blade that is formed in a disk shape including a cutting edge (110) on the outer surface, and can cut a workpiece by the cutting edge (110) as the disk rotates around the center. The cutting portion (100) is positioned at in the assembled double saw blade (1000), and can be formed with a diameter (D1) larger than the chamfered portion (200) so as to be positioned at the frontmost position with respect to the moving direction, and thus can be a structure that first comes into contact with the workpiece. The cutting portion (100) can be formed without limitation on a material that can cut a workpiece including a metal material at a high speed. In one embodiment of the present invention, the cutting portion (100) and the cutting edge (110) can be formed of an alloy steel, particularly high-speed steel (HSS).

[0037] In addition, the cutting blade (110) is a plurality of blades formed on the edge along the outer circumferential surface of the cutting part (100), and may be formed integrally with the cutting part (100). The cutting blade (110) cuts the material to be cut by the rotation of the cutting part (100), and can be configured by selecting the size, shape, angle, etc. of the blade according to the material or size of the material to be cut, etc. Referring to FIG. 3, the plurality of blades may have a form that is inclined with a predetermined inclination toward both directions of one side and the other side with respect to the surface of the cutting part (100), and the cutting blade (110) may be configured such that blades having inclinations in different directions are alternately arranged. In addition, the plurality of blades may have different lengths, and in this case, the length is the length of the blades in the radial direction of the cutting part (100). When the blades have different lengths, it is preferable that the cutting blade (110) be formed such that blades having different lengths are alternately arranged. The cutting section (100) can be formed so as to be distinguishable from the portion where the cutting edge (110) begins, and at this time, the beginning portion of the cutting edge (110) can be distinguished within the cutting section (100) by a step (120).

[0038] In addition, the cutting blade (110) is characterized by having a tapered shape (111) in which the thickness gradually becomes thinner in the radial direction from the outer circumference to the step (120). Referring to FIG. 4, the cutting blade (110) may have a shape in which the outermost thickness is thicker than the inner thickness. This means that, with respect to the direction in which the assembled double saw blade (1000) of the present invention performs cutting and chamfering work, the thickness of the front side in the direction of travel may be formed to be thicker than the thickness of the cutting blade (110) further rearward. In other words, the cutting blade (110) is characterized by having a thickness of the edge that is a predetermined size thicker than the inner side. This is to eliminate interference of the base material or cutting chips by a portion of another cutting blade (110) after the cutting blade (110) cuts the workpiece at a specific location by the thickness of the edge of the cutting blade (110), and can provide an effect of preventing interference of other base materials after the cutting blade (110) cuts or cutting chips generated after cutting from interfering with the saw blade. At this time, the tapered angle of the cutting blade (110) can be determined according to the thickness of the outermost edge of the cutting blade (110) and the thickness of the seating portion (130), and this can be freely set as needed. In one embodiment of the present invention, the tapered angle of the cutting blade (110) can be 3 to 5 degrees.

[0039]

[0040] Referring to FIGS. 1 and 2, the chamfering portion (200) of the present invention is characterized by being a saw blade that is formed in a circular shape including a chamfering blade (210) on the outer circumferential surface, and can chamfer a base material cut by the chamfering blade (210) by rotating the circular plate based on the center (240). The chamfering portion (200) is configured as a pair assembled on each side based on the surface of the cutting portion (100), and the pair of chamfering portions (200) are formed in the same shape that is symmetrical to each other, and can be assembled to face each other based on the cutting portion (100). That is, the pair of chamfering portions (200) of the same symmetrical shape can be combined with the cutting portion (100) in a form that faces each other based on the cutting portion (100). The chamfering portion (200) may be formed with a diameter (d1) at least smaller than that of the cutting portion (100), and may be arranged rearward with respect to the direction of travel, such that the chamfering portion (200) contacts the base material after the cutting portion (100) has cut. The chamfering portion (200) may be formed without limitation on a material that can cut a workpiece including a metal material at a high speed. In one embodiment of the present invention, the chamfering portion (200) and the chamfering blade (210) may be formed of an alloy steel, particularly a high-speed steel (HSS) material.

[0041] In addition, referring to FIG. 3, the chamfering blade (210) is configured to include a plurality of blades formed at the edge along the outer circumferential surface of the chamfering portion (200), and can be formed integrally with the chamfering portion (200) while forming a predetermined inclined surface (211). The chamfering blade (210) cuts and processes the edge of the base material cut by the cutting blade (110), and since the chamfering blade (210) forms a predetermined inclined surface (211), the assembled dual saw blade (1000) moves along the moving direction, and after the cutting portion (100) performs cutting, the inclined surface (211) of the chamfering blade (210) contacts the edge of the cut base material, thereby performing chamfering simultaneously. Accordingly, the chamfering blade (210) includes a sloped surface (211) that is inclined toward the cutting portion (100), and the chamfering blades (210) configured as a pair are characterized in that the sloped surfaces (211) are arranged to face each other and face each other based on the cutting portion (100). The slope of the sloped surface (211) can be configured by selecting the slope angle, size, etc. of the blade according to the material of the workpiece, the conditions of the work, etc.

[0042] In addition, referring to FIG. 4, the chamfering blade (210) is a toothed portion that chamfers the base material cut by the cutting blade (110), and is characterized by being arranged on the outer circumferential surface of the chamfering portion (200) and positioned further back than the cutting blade (110) with respect to the direction in which the assembled double saw blade (1000) of the present invention progresses. The chamfering portion (200) is configured to be coupled to correspond to both sides of each cutting portion (100), and the chamfering blade (210) is characterized by including an inclined surface (211) that faces each other with respect to the cutting portion (100). The chamfering blade (210) is characterized by forming an inclined surface (211) in such a way that the outer diameter (d1) of one surface in contact with the cutting portion (100) is larger than the outer diameter (d1') of the other surface that is not in contact with the cutting portion (100). The inclined surface (211) may have a shape in which the outer side is inclined downward based on the cutting portion (100). That is, the chamfering portion (200) may form the inclined surface (211) so that the chamfering blade (210) has a peak shape with respect to the moving direction. At this time, the inclined surface (211) can freely form the angle of the inclined surface (211) by determining the chamfering angle to be performed as needed. Due to this configuration, since the chamfering portion (200) includes the inclined surface (211), the assembled dual saw blade (1000) can move forward in the moving direction to perform cutting, and at the same time, the chamfering operation can be performed simultaneously by the chamfering portions (200) formed on both sides of the cutting portion (100). In one embodiment of the present invention, the angle of the inclined surface (211) of the chamfering portion (200) may be 30 to 45 degrees.

[0043]

[0044] The present invention is characterized in that the chamfering portion (200) is configured such that a portion of the end is hidden by the cutting portion (100). Accordingly, referring to FIGS. 3 and 4, the cutting portion (100) of the present invention includes a step (120) that is sunken to a predetermined thickness on the inner surface of the cutting blade (110), and is characterized in that the chamfering portion (200) is coupled so as to be positioned inward from the step (120), so that the chamfering blade (210) is formed with a portion hidden by the step (120). That is, with respect to the direction of travel of the assembled double saw blade (1000), the chamfering blade (210) can be operated with a portion of the edge being hidden by the step (120).

[0045] Referring to FIG. 5 for more detailed explanation, the step (120) is formed on the inner side of the cutting edge (110) formed on the edge of the cutting portion (100), and may be formed at the part where the cutting edge (110) and the seating portion (130) come into contact. The step (120) may be formed by being recessed to a predetermined thickness at the edge of the inner peripheral surface of the cutting edge (110), and at this time, the thickness may be the difference between the thickness of the inner peripheral surface of the cutting edge (110) and the thickness of the seating portion (130). It is preferable that the step (120) have a very predetermined thickness so that it can have an extremely small area of ​​the edge of the chamfering blade (210), and this may be a size that can be distinguished with the naked eye. Due to this configuration, a part of the chamfering blade (210) is covered by the step (120), thereby preventing foreign substances from getting caught during cutting, thereby solving the problem of double saw blade operation caused by foreign substances.

[0046] And referring to FIG. 4, the cutting part (100) of the present invention preferably forms a seating part (130) with the same thickness on the inner side in the radial direction from the step (120), and a chamfered part (200) is coupled to the seating part (130). Here, the seating part (130) is a part between the cutting edge (110) and the central hole (150), and the chamfered part (200) can be coupled to the seating part (130) by making contact with it. Unlike the cutting edge (110) which has a tapered shape (111) in cross section, the seating part (130) may have a straight shape without an incline. In other words, the seating part (130) may have a flat shape with the same thickness. The cutting portion (100) may be a mounting portion (130) in all parts except for the cutting edge (110) formed on the outer surface, and may be a portion formed flat after being sunken from the inner end of the cutting edge (110) by a step (120).

[0047] Referring to FIG. 6, in an embodiment of the present invention, the outer diameter (d1) of the chamfering blade (210) is preferably smaller than the inner diameter (D2) of the cutting blade (110). More specifically, the outer diameter (d1) of the chamfering blade (210) forming the outermost corner of the chamfering portion (200) is formed smaller than the inner diameter (D2) of the inner end of the cutting blade (110), so that the chamfering blade (210) does not touch the step (120). That is, a predetermined gap may be formed between the step (120) and the chamfering blade (210). At this time, the gap is preferably a very predetermined size about the thickness of the step (120), or the gap may be equal to or slightly larger than the thickness of the step (120). This means that when the cutting part (100) and the chamfering blade (210) are assembled thereafter, the edge of the chamfering blade (210) can be increased by a predetermined size by the pressure of the cutting part (100) and the chamfering blade (210), and at this time, by providing a predetermined gap between the chamfering blade (210) and the cutting blade (110), it is possible to provide an effect of assembling an assembled double tooth while accommodating an error range according to a change in the outer diameter of the chamfering blade (210). In addition, expansion may occur in the cutting portion (100) and the chamfering portion (200) due to heat generated from friction between the cutting material and the saw blade during the cutting and chamfering operation of the assembled double saw blade (1000). At this time, by providing a predetermined gap between the chamfering blade (210) and the cutting blade (110), it is possible to provide an effect of preventing the chamfering blade (210) and the step (120) from being excessively close to each other even when the chamfering portion (200) expands due to the gap.

[0048] The assembled double saw blade (1000) of the present invention is characterized in that, when the chamfered portions (200) are brought into contact with both sides of the cutting portion (100) and are assembled and fixed, a predetermined gap (α) is included in the portion where the cutting portion (100) and the chamfered portion (200) are brought into contact and assembled, and when the cutting portion (100) and the chamfered portion (200) are assembled while being further pressed by the gap (α), the portion where the gap is not formed is more elastically pressed and assembled. Accordingly, referring to FIG. 5, the assembled double saw blade (1000) of the present invention is characterized in that it is formed by including a predetermined gap (α) formed between the center portion (150) of the cutting portion (100) and the center portion (240) of the chamfered portion (200) that face each other. The gap (α) may be formed by the distance between the surfaces where each cutting portion (100) and the chamfered portion (200) meet each other. In more detail, a gap (α) may be formed between the peripheral portion of the hole (150) formed in the center of the cutting portion (100) and the peripheral portion of the hole (240) formed in the center of the chamfered portion (200) facing each other. Due to this configuration, when the double saw blades are assembled together, the cutting portion (100) and the chamfered portion (200) have a structure that allows them to be more closely and strongly coupled, thereby providing ease and stability of assembly.

[0049] Referring to FIG. 5, the cutting portion (100) includes a first protruding portion (140) (T) having a predetermined diameter (D3) and protruding outward from the seating portion (130) to a predetermined height, and the chamfered portion (200) includes a second protruding portion (230) (t) having a corresponding diameter (d3) at a position corresponding to the first protruding portion (140) and protruding to a predetermined height toward one surface of the cutting portion (100), and a gap (α) may be formed between the first protruding portion (140) and the second protruding portion (230) facing each other. The first protruding portion (140) may be formed to protrude outward in a direction toward each chamfered portion (200) from both sides of the cutting portion (100), and may be formed to protrude to a height t higher than the seating portion (130). And the second protruding portion (230) is formed to protrude in the direction toward the cutting portion (100) on one surface of the chamfering portion (200) that comes into contact with the cutting portion (100). At this time, the chamfering portion (200) may further include a recessed portion (A) that is recessed to a certain height between the second protruding portion (230) (t) and the chamfering blade (210), and the second protruding portion (230) may be formed radially inward of the recessed portion (220) and may be formed to protrude to a height of T from the recessed portion. That is, the cutting portion (100) formed in a disk shape may have a cutting blade (110), a step (120), a seating portion (130), a first protruding portion (140), and a hole (150) sequentially formed in the radial direction from the edge. In addition, the chamfered portion (200) formed in a circular shape with a diameter smaller than that of the cutting portion (100) may have a chamfered edge (210), a recessed portion (220), a second protruding portion (230), and a hole (240) sequentially formed in the radial direction from the edge.And, between the first protruding portion (140) and the second protruding portion (230), a gap (α) is formed due to the height difference of each protruding portion, and then the cutting portion (100) and the chamfering portion (200) are pressed against each other, and the gap (α) is removed, so that the mounting portion and the chamfering blade (210) can be assembled by being more closely coupled by elasticity.

[0050] In addition, referring to FIG. 5, it is preferable that the height (A) of the recessed portion is greater than the sum of the height (T) of the first protruding portion (140) and the height (t) of the second protruding portion (230). That is, a space can be formed between the cutting portion (100) and the chamfering portion (200) by the recessed portion (220) formed on the inside of the chamfering blade (210), and since the height (A) of the recessed portion (220) forming the space is formed to be greater than the sum of the height (T) of the first protruding portion (140) of each cutting portion (100) and the height (t) of the second protruding portion (230) of the chamfering blade (210), a gap exists between the first protruding portion (140) and the second protruding portion (230) in the space of the recessed portion (220), which can be a gap (α). At this time, when the distance of the gap (α) is a, the height (A) of the sunken portion may correspond to the sum of the height (T) of the first protruding portion (140), the height (t) of the second protruding portion, and the height (a) of the gap (α). In addition, the height (T) of the first protruding portion (140) may be smaller than the height (t) of the second protruding portion (230). That is, the height (T) of the first protruding portion (140) protruding outward from the seating portion (130) of the cutting portion (100) is formed to be smaller than the height (t) of the second protruding portion (230) protruding to one side from the sunken portion (220) of the chamfering portion (200), so that the second protruding portion (230) may be formed higher in the space of the sunken portion (220). And, the outer diameter (D1) of the cutting portion (100) is preferably larger than the outer diameter (d1) of the chamfering portion (200), and the diameter (D3) of the first protruding portion (140) and the diameter (d3) of the second protruding portion (230) may be the same. At this time, the diameter (d2) including the sunken portion (220) of the chamfering portion (200) is larger than the diameter (d3) of the second protruding portion (230), and the cutting portion (100) is characterized in that it is smaller than the diameter (D2) of the seating portion (130), which is the inner diameter of the cutting blade (110) and the inner diameter up to the step (120) of the cutting portion (100).

[0051]

[0052] In the assembled double saw blade (1000) including the above-described features, a double saw blade assembly can be formed by assembling them by a joining means. The assembled double saw blade (1000) of the present invention is assembled by a joining means that is inserted into the through-hole (150) of the cutting part (100) and the through-hole (240) of the chamfering part (200) together to join the cutting part (100) and the chamfering part (200), and it is preferable that the joining means assembles the pair of chamfering parts (200) by pressing them toward the cutting part (100) so as to eliminate the gap (α). At this time, the joining means is inserted into the through-hole (150) of the cutting part (100) and the through-hole (240) of the chamfering part (200), and the joining means presses the pair of chamfering parts (200) toward the cutting part (100) and then joins them, thereby forming a double saw blade assembly. Alternatively, the above-mentioned opening (150, 240) may form a predetermined keyway.

[0053] In addition, it is preferable that the assembled double saw blade (1000) in which the cutting part (100) and a pair of chamfering parts (200) are joined and contact each other rotate by receiving power while their positions are fixed to each other in order to cut the workpiece. That is, it is preferable that the cutting part (100) and the chamfering part (200) constituting the assembled double saw blade (1000) are joined and then rotated while their positions are fixed to each other. Accordingly, as illustrated in FIGS. 1 and 2, the cutting part (100) and the chamfering part (200) may include anti-slip holes (141, 231) of the same size at the same position so as to be in communication with each other. At this time, the anti-slip holes (141, 231) may be formed without limitation as long as they are in positions that can connect the cutting part (100) and the chamfering part (200). In one embodiment of the present invention, the anti-slip holes (141, 231) may be formed in the first protruding portion (140) of the cutting portion (100) and the second protruding portion (230) of the chamfered portion (200) that face each other. In addition, by combining a fixing pin into the through hole of the anti-slip hole (141, 231), the cutting portion (100) and the chamfered portion (200) may be formed to be fixed while preventing each other from slipping.

[0054] Due to this configuration, the assembled double saw blade (1000) of the present invention has a saw blade structure that rotates and operates quickly, and includes a structure that allows each blade part to be assembled more firmly and closely so that it can be more stably combined during operation.

[0055] The technical concept of the present invention should not be construed solely based on the above-described embodiments. The scope of application is diverse, and various modifications and variations are possible within the scope of those skilled in the art without departing from the spirit of the invention as claimed in the claims. Therefore, such improvements and modifications, as long as they are obvious to those skilled in the art, fall within the scope of protection of the present invention.

[0056]

[0057] [Explanation of symbols]

[0058] 1000: Assembled double blade

[0059] 100: Cutting part 110: Cutting edge

[0060] 120: Step 130: Settling part

[0061] 140: First protrusion 150: Through hole

[0062] 200: Chamfering part 210: Chamfering blade

[0063] 220: sunken part 230: second protruding part

[0064] 240: Public

[0065] α: gap

Claims

1. A cutting part having a circular shape including a hole in the center and a cutting edge on the outer surface; and In an assembled double saw blade, a chamfering blade formed on an outer surface in a circular shape including a hole corresponding to the center of the cutting portion and forming an inclined surface toward the cutting blade, and a pair of chamfering portions that are overlapped and face each other on both sides of the cutting portion, The above cutting part includes a step recessed to a predetermined thickness on the inner surface of the cutting blade, The above chamfering part is an assembled double saw blade characterized in that the chamfering blade is positioned inside the step and is joined.

2. In paragraph 1, The above cutting edge is, An assembled double saw blade characterized by a tapered shape in which the thickness gradually decreases in the radial direction from the outer surface to the step.

3. In paragraph 1, The above-mentioned chamfering blade is, An assembled double saw blade characterized in that the outer diameter of one side in contact with the cutting portion is larger than the outer diameter of the other side not in contact with the cutting portion, thereby forming the inclined surface.

4. In paragraph 1, An assembled double saw blade, characterized in that the outer diameter of the chamfering blade is smaller than the inner diameter of the cutting blade.

5. In paragraph 1, The above cutting part, The inner side in the radial direction of the above step forms a settling portion formed with the same thickness, An assembled double saw blade characterized in that the chamfered portion is joined to the above-mentioned mounting portion.

6. In paragraph 5, The above assembled double blade, An assembled double saw blade characterized in that the mounting portion and the chamfering blade are tightly coupled by a predetermined gap formed between the center of the cutting portion and the center of the chamfering portion facing each other.

7. In paragraph 6, The above cutting portion includes a first protruding portion having a certain diameter and protruding outward from the mounting portion by a certain height, The above chamfered portion includes a second protruding portion that protrudes a certain height toward one surface of the cutting portion at a position corresponding to the first protruding portion, An assembled double saw blade characterized in that the gap is formed between the first protruding portion and the second protruding portion facing each other.

8. In paragraph 7, The above chamfered portion includes a recessed portion that is recessed to a certain height between the second protruding portion and the chamfered edge, An assembled double saw blade characterized in that the height of the above-mentioned sunken portion is greater than the sum of the heights of the first protruding portion and the second protruding portion.

9. In paragraph 6, The above assembled double blade, It is assembled by a joining means that is inserted into the through hole of the above-mentioned cutting part and the through hole of the above-mentioned chamfering part together and joins the above-mentioned cutting part and the chamfering part. A double saw blade assembly characterized in that the above-mentioned joining means assembles a pair of the chamfered portions by pressing them in the direction of the cutting portion to remove the gap.

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