Double-blade Duo-cut Band Saw

Abstract

The present invention has the advantage of improving cutting efficiency and reducing the load required for cutting operations, as the blade (100) is formed as a double-edged structure including an outer cutter (120) and an inner cutter (130), so that the cutting action on the workpiece is performed by a plurality of cutters, thereby reducing the concentration of the cutting load on a single cutter, and the outer cutter (120) can cut the workpiece first and the inner cutter (130) can perform additional cutting or auxiliary cutting inside the outer cutter (120).

Description

Technology Field

[0001] The present invention relates to a double-blade duo-cut band saw. Background Technology

[0003] A band saw is a power saw machine that cuts objects by continuously connecting and rotating a toothed metal band (blade) between two or more rotating wheels.

[0004] It is primarily used for cutting metal, pipes, and wood, and is divided into vertical and horizontal types depending on the application, ranging from curved cutting to bulk cutting.

[0005] Band saws utilize a band-shaped blade to minimize waste and produce excellent cuts. They are suitable not only for right-angle cuts but also for adjusting left and right angles (typically 45 degrees) and cutting curves (vertical). Many band saw models operate dry without cutting fluid, resulting in minimal environmental contamination and preventing sparks, making them safe to use in environments such as construction sites.

[0006] A band saw is equipment that requires durability to withstand long hours of operation, precision to maintain cutting quality regardless of the working environment, and economic efficiency to effectively manage consumable costs, labor costs, and power consumption.

[0007] However, because conventional band saws have a structure where both cutting load and wear are concentrated on a single blade, the blade life is shortened, leading to increased variation in the quality of the cut surface and resulting in problems such as frequent replacement and maintenance costs. Prior art literature

[0009] Republic of Korea Registered Patent No. 10-1693344 The problem to be solved

[0010] The present invention was devised to solve the aforementioned conventional problems and aims to provide a duo-cut band saw with a double-blade structure.

[0011] In addition, the present invention aims to provide a double-blade duo-cut band saw capable of dispersing the cutting load by means of an outer cutter (120) and an inner cutter (130) and improving the evacuation of cutting chips generated during the cutting process.

[0012] In addition, the present invention aims to provide a double-blade duo-cut band saw that can reduce positional displacement, lifting, peeling, or detachment of the cutting tip (150) during the cutting process by ensuring that the cutting tip (150) can be stably installed on the outer cutter (120).

[0013] In addition, the present invention aims to provide a double-blade duo-cut band saw that can simultaneously improve cutting performance and service life by ensuring both the wear resistance of the cutting tip (150) and the elasticity of the blade (100). means of solving the problem

[0015] A band saw (1) according to the present invention comprises a band portion (10) and a blade (100) protruding outwardly at one edge of the band portion (10) in a direction intersecting the longitudinal direction of the band portion (10), and the blade (100) is characterized by having a double blade.

[0016] The blade (100) may include a blade portion (110) coupled to the edge of the band portion (10), an outer cutter (120) protruding from the blade portion (110) in a direction intersecting the longitudinal direction of the band portion (10), and an inner cutter (130) protruding from the blade portion (110) in a direction intersecting the longitudinal direction of the band portion (10) and positioned between the outer cutter (120) and the band portion (10).

[0017] The outer cutter (120) may include an outer inclined border (121) positioned in an outer direction perpendicular to the longitudinal direction of the band portion (10), an outer cutting border (122) formed to intersect toward the band portion (10) and form an acute angle between the outer inclined border (121), and an outer cutter tip (125) connecting the outer inclined border (121) and the outer cutting border (122) at an acute angle.

[0018] The inner cutter (130) may be positioned in a cutting groove between adjacent outer cutters (120) and may be formed to further cut or crush a workpiece or cutting chip that has been primarily cut by the outer cutter (120).

[0019] The inner cutter (130) may include a first inner cutter border (131), a second inner cutter border (132), and an inner cutter tip (135). The first inner cutter border (131) and the second inner cutter border (132) may be formed as curved surfaces, and a first inner groove (141) and a second inner groove (142) may be formed by the curved surfaces.

[0020] The first inner groove (141) and the second inner groove (142) can form a discharge path that guides cutting chips or sawdust generated during the cutting process to the outside.

[0021] A cutting tip (150) may be installed at the tip of the outer cutter (120). The cutting tip (150) may include a cutting clearance surface (151), a cutting bevel surface (152), a first tip installation surface (153), a second tip installation surface (154), a cutting blade (155), and a tip fitting part (156).

[0022] The tip groove (126) may include a first tip groove surface (126a), a second tip groove surface (126b), and a tip fitting groove (126c). The tip fitting part (156) can be inserted into the tip fitting groove (126c) to fit and fix the cutting tip (150) to the outer cutter (120). Effects of the invention

[0024] First, the present invention has the advantage of reducing the concentration of cutting load on a single cutter, as the blade (100) is formed as a double-edged structure including an outer cutter (120) and an inner cutter (130), and the cutting action on the workpiece is performed by a plurality of cutters.

[0025] Second, the present invention has the advantage of improving cutting efficiency and reducing the load required for cutting operations, as the outer cutter (120) cuts the workpiece first and the inner cutter (130) can perform additional cutting or auxiliary cutting inside the outer cutter (120).

[0026] Third, the present invention has the advantage that the inner cutter (130) includes a first inner cutter border (131) and a second inner cutter border (132), and the first inner groove (141) and the second inner groove (142) are formed, thereby guiding and discharging sawdust or cutting chips generated during the cutting process to the outside along the curved surface.

[0027] Fourth, the present invention has the advantage of being able to improve the wear resistance and durability of the cutting part that comes into direct contact with the workpiece, and to maintain cutting performance stably even during repetitive cutting operations, as the cutting tip (150) is positioned on the outer cutter tip (125) of the outer cutter (120).

[0028] Fifth, the present invention has the advantage that the cutting tip (150) includes a cutting clearance surface (151), a cutting bevel surface (152), and a cutting edge (155), thereby facilitating the discharge of cutting chips, reducing unnecessary friction with the workpiece, and reducing wear of the cutting edge.

[0029] Sixth, the present invention has the advantage that the cutting tip (150) can be supported in multiple directions on the outer cutter (120) as the first tip groove surface (126a), the second tip groove surface (126b), and the tip fitting groove (126c) are formed in the tip groove (126), and the first tip mounting surface (153), the second tip mounting surface (154), and the tip fitting part (156) are formed on the cutting tip (150). Seventh, the present invention has the advantage that the cutting tip (150) can be prevented from moving its position during the welding or joining process of the cutting tip (150) and can be reduced from the cutting tip (150) detaching from the outer cutter (120) during the cutting process as the tip fitting part (156) is fitted and fixed in the tip fitting groove (126c).

[0030] Eighth, the present invention has the advantage that the cutting load acting on the cutting tip (150) can be distributed to the outer cutter (120) through the tip groove (126) and the tip fitting groove (126c), thereby suppressing lifting, peeling, or breakage of the cutting tip (150) and extending the service life of the band saw (1).

[0031] Ninth, as the cutting performance and durability of the blade (100) are improved, the present invention has the advantage of extending the replacement cycle of the saw blade and reducing maintenance costs, and reducing variations in the quality of the cut surface to improve work precision. Brief explanation of the drawing

[0033] FIG. 1 is a perspective view of a band saw device equipped with a double-blade duo-cut band saw according to a first embodiment of the present invention. Figure 2 is a perspective view of the band saw shown in Figure 1. Figure 3 is a partial enlarged view of Figure 2. FIG. 4 is a perspective view of a double-blade duo-cut band saw according to a second embodiment of the present invention before the cutting tip is installed. FIG. 5 is a perspective view of a double-blade duo-cut band saw with a cutting tip installed according to a second embodiment of the present invention. FIG. 6 is a partial perspective view of a double-blade duo-cut band saw according to a third embodiment of the present invention. FIG. 7 is a partial perspective view of a double-blade duo-cut band saw according to the fourth embodiment of the present invention. Specific details for implementing the invention

[0034] The present invention is susceptible to various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals have been used for similar components in the description of each drawing.

[0035] Terms such as first, second, A, B, etc., may be used to describe various components, but said components shall not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0036] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0037] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0038] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0039] In this document, "configured to" may be used interchangeably with, depending on the context, for example, in hardware or software, "suitable for," "capable of," "modified to," "made to," "capable of," or "designed to." In some situations, the expression "device configured to" may mean that the device is "capable of" doing something together with other devices or components.

[0040] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding of the present invention, the same reference numerals are used for identical components in the drawings, and redundant descriptions of identical components are omitted.

[0041] FIG. 1 is a perspective view of a band saw device equipped with a double-blade duo-cut band saw according to a first embodiment of the present invention, FIG. 2 is a perspective view of the band saw shown in FIG. 1, and FIG. 3 is a partial enlarged view of FIG. 2.

[0042] The double-blade duo-cut band saw (1) according to the present embodiment includes a band portion (10) and a blade (100) that protrudes outwardly from one edge of the band portion (10) and intersects with the longitudinal direction of the band portion (10).

[0043] A band saw, also known as a band saw or band saw, is a device that cuts wood, metal, plastic, meat, stone, etc. by rotating a saw blade in the form of an endless track. Unlike a circular saw that uses a circular blade, a band saw has a structure in which a long, connected band-shaped blade circulates between two or more pulleys to perform cutting.

[0044] The band saw is mounted on the above band saw device and circulated.

[0045] The band saw according to the present embodiment is a band-shaped saw blade that performs actual cutting, with one end and the other end connected to form a loop. Both ends are welded to form a single closed loop.

[0046] The blade (100) can be heat-treated unlike the band portion (10).

[0047] The blade (100) comprises a blade portion (110) coupled to the edge of the band portion (10), an outer cutter (120) protruding from the blade portion (110) in a direction intersecting the longitudinal direction of the band portion (10), and an inner cutter (130) protruding from the blade portion (110) in a direction intersecting the longitudinal direction of the band portion (10) and positioned between the outer cutter (120) and the band portion (10).

[0048] The outer cutter (120) and inner cutter (130) can be repeatedly arranged along the longitudinal direction of the band portion (10). As the outer cutter (120) and inner cutter (130) are repeatedly arranged, the cutting action on the workpiece can be continuously performed during the process of the band saw (1) moving in a circular motion.

[0049] The outer cutter (120) first contacts the workpiece to perform the main cutting, and the inner cutter (130) performs the auxiliary cutting inside the outer cutter (120). Accordingly, the cutting force acting on the workpiece is not concentrated at one point but can be distributed to the outer cutter (120) and the inner cutter (130).

[0050] The repeating interval of the outer cutter (120) and inner cutter (130) may be formed differently depending on the material of the workpiece, the thickness of the workpiece, the moving speed of the band saw (1), or the cutting load. For example, when cutting metal materials, the interval between the outer cutters (120) may be formed relatively large considering the cutting load, and when cutting wood or resin materials, the interval between the outer cutters (120) may be formed relatively small considering the cutting speed.

[0051] In this embodiment, the blade portion (110) is described as a separate configuration, but the outer cutter (120) and inner cutter (130) may be formed to protrude from the edge of the band portion (10).

[0052] The above outer cutters (120) may be arranged in multiple numbers along the length direction of the band portion (10). A groove formed between two outer cutters (120) is defined as a cutting groove.

[0053] The inner cutter (130) is placed in the cutting groove.

[0054] The above inner cutter (130) may be arranged in multiple numbers along the length direction of the band portion (10).

[0055] In this embodiment, the outer cutter (120) and the inner cutter (130) are connected to form the outer cutter (120) and the inner cutter (130).

[0056] In this embodiment, the outer cutter (120) is formed to be inclined in the cutting direction, and the inner cutter (130) is positioned within the angle between the outer cutter (120) and the blade portion (110).

[0057] In this embodiment, the direction in which the band saw moves for cutting is called the cutting direction, and the opposite direction is called the cutting opposite direction.

[0058] In this embodiment, the direction in which the blade (100) is positioned relative to the length direction of the band saw or the direction of movement of the band saw is called the outer direction, and the opposite direction is called the inner direction.

[0059] The outer cutter (120) comprises an outer inclined border (121) positioned in an outer direction perpendicular to the longitudinal direction of the band portion (10), an outer cutting border (122) formed to intersect toward the band portion (10) and form an acute angle between the outer inclined border (121), and an outer cutter tip (125) connecting the outer inclined border (121) and the outer cutting border (122) at an acute angle.

[0060] The inner end of the outer inclined border (121) is positioned opposite the cutting direction and is connected to the blade portion (110). The outer end of the outer inclined border (121) is positioned in the cutting direction.

[0061] The angle between the outer slope border (121) and the outer cutting border (122) is formed to be greater than 20 degrees and less than 45 degrees.

[0062] The workpiece is cut through the outer cutting border (122) above.

[0063] The inner end of the outer cutting border (122) is curvedly connected to the inner cutter (30).

[0064] The inner cutter (130) connects two adjacent outer cutters (120).

[0065] Specifically, the inner cutter (130) connects the outer inclined border (121) of the outer cutter (120) positioned in the cutting direction and the outer cutting border (122) of the outer cutter (120) positioned in the opposite cutting direction.

[0066] The inner cutter (130) comprises a first inner cutter border (131) and a second inner cutter border (132) formed in a curved manner, and an inner cutter tip (135) formed to intersect the first inner cutter border (131) and the second inner cutter border (132).

[0067] The cutting groove is formed between the outer cutting border (122) of the outer cutter (120) positioned opposite the cutting direction and the outer bevel border (121) of the outer cutter (120) positioned in the cutting direction among two adjacent outer cutters (120).

[0068] In the above cutting groove, the inner cutter (130) protrudes outwardly in an inclined manner in the cutting direction.

[0069] Cutting can be performed through the first inner cutter border (131) and the second inner cutter border (132). Additionally, the shape of the first inner cutter border (131) and the second inner cutter border (132) allows for the effective discharge of sawdust or cutting chips generated during cutting.

[0070] In addition, the first inner cutter border (131) and the second inner cutter border (132) are characterized by being able to re-grind the sawdust or cutting chips generated by the outer cutter (120).

[0071] In the inner cutter (130), the inner cutter tip (135) protrudes outward in the cutting direction. The first inner cutter border (131) is positioned further outward in the cutting direction than the second inner cutter border (132).

[0072] The first inner cutter border (131) is connected to the outer cutting border (122) of the outer cutter (120) positioned opposite the cutting direction. The outer end of the first inner cutter border (131) is connected to the inner end of the outer cutting border (122).

[0073] The second inner cutter border (132) is connected to the outer inclined border (121) of the outer cutter (120) positioned in the cutting direction. The inner end of the second inner cutter border (132) is connected to the outer inclined border (121).

[0074] A first inner groove (141) is formed by the first inner cutter border (131), and a second inner groove (142) is formed by the second inner cutter border (132).

[0075] The first inner groove (141) and the second inner groove (142) are formed concavely inwardly in the direction opposite to the cutting.

[0076] The first inner groove (141) and the second inner groove (142) can function as chip discharge spaces to prevent cutting chips from accumulating. As the first inner groove (141) and the second inner groove (142) are formed as curved surfaces, cutting chips generated during the cutting process are guided along the curved surface and can be discharged to the outside from the cutting grooves.

[0077] The first inner groove (141) and the second inner groove (142) may be positioned behind the cutting path of the outer cutter (120). Accordingly, cutting chips generated by the outer cutter (120) may be re-crushed or guided in the discharge direction while in contact with the inner cutter (130).

[0078] The inner cutter tip (135) may be positioned opposite to the cutting direction of the outer cutter tip (125). Accordingly, the outer cutter (120) may cut the workpiece first, and the inner cutter (130) may subsequently perform cutting or chip crushing.

[0079] Referring to FIG. 3, the outer cutter tip (125) is positioned in the cutting direction relative to the inner cutter tip (135). The first inner groove (141) is positioned in the opposite direction to the cutting relative to the outer cutter tip (125).

[0080] The sawdust or cutting chips generated during the cutting of the outer cutter (120) can be effectively discharged to the outside through the inner cutter (130).

[0081] Specifically, through the shape of the first inner groove (141) and the second inner groove (142), sawdust or cutting chips generated during cutting can be guided along the curved surface and discharged to the outside.

[0082] Meanwhile, a band saw cleaning mechanism (2) for removing sawdust or resin from the surface of the band saw (1) may be further provided in the band saw device.

[0083] A band saw (1) is positioned to penetrate the cleaning mechanism (2), and foreign substances attached to the surface of the band saw (1) can be removed during the movement of the band saw (1).

[0085] FIG. 4 is a perspective view of a double-bladed duo-cut band saw before the cutting tip is installed according to a second embodiment of the present invention, and FIG. 5 is a perspective view of a double-bladed duo-cut band saw with the cutting tip installed according to a second embodiment of the present invention.

[0086] The double-blade duo-cut band saw according to the present embodiment is characterized by having a cutting tip (150) for enhancing durability placed on the outer cutter tip (125).

[0088] The cutting tip (150) may include a material including Stellite. The cutting tip (150) is formed to have a higher hardness than the blade (100) so as to reduce wear on the cutting part that repeatedly contacts the workpiece.

[0089] Stellite is a high-wear and high-heat-resistant alloy with cobalt as its main component. It is generally formed as an alloy in which chromium, tungsten, carbon, nickel, iron, etc. are added to cobalt.

[0090] Stellite is a very hard and wear-resistant material that exhibits excellent performance in environments where metals slide against each other, environments where friction occurs repeatedly at high temperatures, and environments where it comes into contact with corrosive fluids. Therefore, rather than being merely a material with high hardness, it can be viewed as an alloy designed to ensure wear resistance, heat resistance, corrosion resistance, and corrosion-wear resistance.

[0091] The main components of Stellite are cobalt and chromium. Cobalt forms the basic structure of the alloy and plays a role in maintaining mechanical strength even at high temperatures. Chromium inhibits oxidation and corrosion and improves surface corrosion resistance. Tungsten enhances high-temperature strength and wear resistance, while carbon combines with chromium or tungsten to form hard carbides. These carbides are dispersed within the alloy, inhibiting material wear during friction and cutting processes.

[0092] A cutting tip (150) containing Stellite material can be used as a material that improves the wear resistance of the cutting edge by being welded or bonded to the tip of the tooth or the cutting edge. In particular, it can help reduce wear on the cutting edge and maintain the shape of the cutting edge for a long time when repeatedly cutting wood, metal, resin, composite material, etc. In addition, since Stellite has excellent heat resistance, it is advantageous to reduce deterioration or deformation of the cutting edge even when frictional heat is generated during the cutting process.

[0093] The Stellite material can reduce wear on the cutting part caused by friction and impact generated during the cutting process. In addition, since the Stellite material can ensure heat resistance against frictional heat generated during the cutting process, thermal deformation or deterioration of the cutting part can be suppressed.

[0094] The Stellite material may be formed over the entire blade, but preferably may be partially disposed on the cutting edge or the tip of the outer cutter that comes into direct contact with the workpiece. Accordingly, the blade can maintain the elasticity and toughness required for the cyclic drive of the band saw, while the cutting edge can have excellent wear resistance.

[0095] The Stellite material can be attached to the outer cutter or inner cutter by welding, welding, brazing, or cladding. As the Stellite material is placed at the tip of the outer cutter or inner cutter, wear on the cutting edge can be reduced and the service life of the band saw can be extended.

[0096] The blade (100) may be formed from a metal material having elasticity and toughness, and the cutting tip (150) may be partially disposed at the tip of the blade (100). Accordingly, the band saw (1) can improve the wear resistance of the cutting part in contact with the workpiece while securing the bendability required for circulating drive.

[0097] The cutting tip (150) can be fixed to the outer cutter (120) by at least one of welding, brazing, sintering, or adhesive bonding. After the cutting tip (150) is fixed to the outer cutter (120), both sides of the cutting tip (150) can be ground so as to be continuous with both sides of the blade (100).

[0098] Instead of making the entire blade (100) out of cemented carbide, a cutting tip (150) made of Stellite is fused and placed only on the end portion that actually contacts the workpiece to perform cutting.

[0099] The primary function of a cutting tip is to cut, sever, drill, or machine a workpiece. Since cutting tips have higher hardness and superior wear resistance than general carbon steel or high-speed steel, they can reduce wear on the cutting edge and maintain machining precision when processing metals, wood, stone, composites, plastics, and other materials at high speeds.

[0100] The cutting tip (150) includes a cutting edge (155), a cutting bevel (152), and a cutting clearance surface (151). The cutting edge (155) is the part that directly cuts the workpiece, and the cutting bevel (152) is a surface that guides the direction in which the cutting chips are discharged. The cutting clearance surface (151) is a surface that reduces unnecessary friction with the workpiece.

[0101] The cutting slope surface (152) is formed as a flat or curved surface continuous with the outer cutting border (122). The cutting clearance surface (151) is formed as a flat or curved surface continuous with the outer slope border (121).

[0102] The cutting tip can be classified into a soldered cutting tip and a replaceable cutting tip depending on the fixing method. In this embodiment, the cutting tip (150) is welded to the outer cutter (120).

[0103] The advantages of the cutting tip are high hardness, excellent wear resistance, responsiveness to high cutting speeds, and excellent maintenance of dimensional accuracy.

[0104] In this embodiment, the cutting tip (150) is formed in the shape of an arrowhead or a wedge.

[0105] The thickness of the cutting tip (150) may be formed to be thicker than the thickness of the blade (100). After welding, the two sides of the cutting tip (150) may be cut or polished to form a continuous shape with both sides of the blade (100).

[0106] A tip groove (126) is formed between the outer inclined border (121) and the outer cutting border (122) to accommodate the cutting tip (150).

[0107] The tip groove (126) comprises a first tip groove surface (126a) bent inward from the outer end of the outer inclined border (121), and a second tip groove surface (126b) bent toward the outer inclined border (121) from the outer end of the outer cutting border (122) and connected to intersect with the first tip groove surface (126a).

[0108] The first tip groove surface (126a) and the second tip groove surface (126b) are arranged to intersect, and in this embodiment, an angle between them greater than 90 degrees and less than 180 degrees is formed.

[0109] The cutting tip (150) includes a first tip mounting surface (153) that is in close contact with the first tip groove surface (126a) and a second tip mounting surface (154) that is in close contact with the second tip groove surface (126b).

[0110] The first tip installation surface (153) and the second tip installation surface (154) are arranged to intersect.

[0111] The remaining configurations below are similar to the first embodiment, so a detailed description is omitted.

[0113] FIG. 6 is a partial perspective view of a double-blade duo-cut band saw according to a third embodiment of the present invention.

[0114] Referring to FIG. 6, the double-blade duo-cut band saw according to the present embodiment includes a structure in which a cutting tip (150) is installed on an outer cutter (120). The cutting tip (150) according to the present embodiment includes a cutting clearance surface (151) and a cutting bevel surface (152) as in the second embodiment, and is configured to be positioned at the tip of the outer cutter (120) to cut a workpiece.

[0115] The above cutting clearance surface (151) may be arranged in a direction continuous with the outer bevel border (121). The above cutting clearance surface (151) is formed to reduce unnecessary friction with the workpiece during the cutting process and to stably maintain the cutting position of the tip of the cutting tip (150). The above cutting bevel surface (152) may be arranged in a direction continuous with the outer cutting border (122). The above cutting bevel surface (152) is formed to guide cutting chips or sawdust generated during the cutting process toward the cutting groove and discharge them.

[0116] In this embodiment, the outer cutter (120) includes a tip groove (126) in which a cutting tip (150) is installed.

[0117] The tip groove (126) includes a first tip groove surface (126a) and a second tip groove surface (126b), and a tip fitting groove (126c) that connects the first tip groove surface (126a) and the second tip groove surface (126b) and is concavely inserted into the inner side of the outer cutter (120).

[0118] In this embodiment, the tip fitting groove (126c) is formed concavely inwardly in the direction opposite to the cutting. The tip fitting groove (126c) is formed in the shape of part of a circle and is open in the direction of the cutting tip (150).

[0119] The first tip mounting surface (153) is formed in a shape corresponding to the first tip groove surface (126a), and the second tip mounting surface (154) is formed in a shape corresponding to the second tip groove surface (126b).

[0120] The cutting tip (150) further includes a tip fitting part (156) that connects the first tip mounting surface (153) and the second tip mounting surface (154) and is inserted into the tip fitting groove (126c) to be fitted and fixed.

[0121] The tip fitting part (156) is formed as a part of the shape of the disc and forms a concave groove with the first tip mounting surface (153) and the second tip mounting surface (154), respectively. The tip fitting part (156) is formed as a part of the disc with an internal angle greater than 180 degrees and less than 300 degrees, and is characterized by forming mutual locking when separated after being assembled into the tip groove (126).

[0122] A welding groove (127) is formed in the outer cutter (120) in which the tip fitting part (156) is fitted and assembled.

[0123] The tip fitting portion (156) can come into contact with the inner surface of the tip fitting groove (126c) while inserted into the inner side of the tip fitting groove (126c). As the tip fitting portion (156) and the tip fitting groove (126c) are formed with corresponding curved shapes, the local concentration of the cutting load acting on the cutting tip (150) can be reduced.

[0124] The tip fitting portion (156) may be formed to protrude from the rear portion of the cutting tip (150), and the tip fitting groove (126c) may be formed concavely inwardly into the outer cutter (120). Accordingly, with the cutting tip (150) installed in the tip groove (126), the tip fitting portion (156) may be engaged with the tip fitting groove (126c).

[0125] The locking structure of the tip fitting part (156) and the tip fitting groove (126c) assists in the pre-welding position alignment of the cutting tip (150) and can prevent the cutting tip (150) from separating from the tip groove (126) due to vibrations generated during the cutting process after welding.

[0126] The tip fitting groove (126c) can be modified into a groove shape that includes not only a part of a circle but also an ellipse, a polygon, or a curved surface. In this case, the tip fitting part (156) is formed in a shape corresponding to the tip fitting groove (126c) so that the cutting tip (150) can be fitted and fixed to the outer cutter (120).

[0127] Since the tip fitting part (156) is fitted and fixed in the tip fitting groove (126c), it has the characteristic of being able to suppress positional movement when welding and fixing the cutting tip.

[0128] The first tip groove surface (126a) is formed to contact the first tip mounting surface (153) of the cutting tip (150). The second tip groove surface (126b) is formed to contact the second tip mounting surface (154) of the cutting tip (150).

[0129] The tip fitting groove (126c) can support the rear or lower side of the cutting tip (150) to distribute the load acting on the cutting tip (150) to the outer cutter (120).

[0130] In this embodiment, the cutting tip (150) is supported in multiple directions by the first tip groove surface (126a), the second tip groove surface (126b), and the tip fitting groove (126c).

[0131] The cutting tip (150) can be made surface contact and fitted contact with the outer cutter (120) through the first tip mounting surface (153), the second tip mounting surface (154), and the tip fitting part (156). Accordingly, the cutting tip (150) can secure a wider contact area than when fixed by a simple line contact or point contact method.

[0132] As the contact area increases, the bonding strength between the cutting tip (150) and the outer cutter (120) can be improved, and the impact load generated during the cutting process can be dispersed. Therefore, the possibility of the cutting tip (150) breaking or detaching can be reduced.

[0133] In addition, since the assembly position of the cutting tip (150) can be determined by the tip fitting part (156), the positional deviation of the cutting blade (155) can be reduced even when the cutting tip (150) is repeatedly installed on a plurality of outer cutters (120). Accordingly, the entire cutting trajectory of the band saw (1) can be maintained uniformly.

[0134] The remaining configurations below are similar to the first and second embodiments, so a detailed description is omitted.

[0136] The cutting chip discharge performance and dimensional stability of a double-blade duo-cut band saw (1) according to one embodiment of the present invention will be described.

[0137] In this embodiment, pine logs are used as the workpiece, and a double-blade duo-cut band saw (1) (hereinafter referred to as the "duo-cut method") in which the blade (100) is formed with a double-blade structure is compared with a single-blade band saw (hereinafter referred to as the "single-blade method") composed only of a single outer cutter to verify the effect of improving cutting chip (sawdust) discharge performance and dimensional stability according to the double-blade structure.

[0138] In a single-blade method, cutting chips generated by the outer cutter may accumulate in the cutting groove. Particularly in a low-temperature environment, the cutting chips within the cutting groove may freeze and reattach to the surface of the blade (100), causing the cutting path of the outer cutter (120) to be deflected laterally, which may reduce the precision of the sawn dimensions.

[0139] In contrast, the double blade duo-cut band saw (1) according to the present invention is formed such that the outer cutter (120) first cuts the workpiece to generate cutting chips, and the first inner groove (141) and the second inner groove (142) of the inner cutter (130) quickly guide and discharge the cutting chips to the outside. Accordingly, since the cutting chips can be discharged outside the cutting grooves before freezing and reattaching, the straightness of the blade (100) and the precision of the sawing dimensions can be stably maintained even in a low-temperature environment.

[0140] Under summer conditions (+22°C) where the freezing retention coefficient of the cutting chips converges to 0, the cutting chips can be freely discharged, thereby minimizing the difference in dimensional characteristics between the single-blade method and the duo-cut method. At this time, a thickness deviation of ±0.22 mm, a blade deflection of 0.70 mm / m, an effective material yield of 81.47%, and a composite dimensional quality index of 83.0 points can be achieved.

[0141] Under winter conditions (-12°C), where the freezing retention coefficient of cutting chips is high, a significant difference in performance is observed between the single-blade method and the duo-cut method. Under winter conditions, the single-blade method shows a thickness deviation of ±0.519 mm, a blade deflection amount of 1.771 mm / m, an effective material yield of 73.35%, and a composite dimensional quality index of 65.2 points. This is attributed to the fact that in a winter environment, cutting chips freeze and reattach to the side of the blade (100), thereby applying a lateral deflection force to the blade (100).

[0142] In contrast, the Duo Cut method according to the present invention exhibits a thickness deviation of ±0.310 mm, a blade deflection of 1.021 mm / m, an effective material yield of 79.00%, and a composite dimensional quality index of 77.6 points under winter conditions (-12°C). Specifically, compared to the single-blade method, the thickness deviation of the Duo Cut method is reduced by approximately 40.3%, the blade deflection is reduced by approximately 42.3%, the effective material yield is improved by approximately 5.65%p, and the composite dimensional quality index is improved by 12.4 points. In addition, the post-process planing finish allowance is reduced by approximately 27.2% from 1.54 mm to 1.12 mm, allowing for additional material savings.

[0143] As described above, the double-blade duo-cut band saw (1) according to the present invention can improve dimensional stability and material yield compared to a single-blade method by rapidly discharging cutting chips through the discharge path formed by the first inner groove (141) and the second inner groove (142) of the inner cutter (130) under winter conditions where the freezing and reattachment of cutting chips is severe. In particular, the performance improvement effect due to the discharge of cutting chips is significantly manifested in the low-temperature winter season rather than in the summer season when freezing does not occur, thereby maximizing the differential performance improvement due to the double-blade structure.

[0145] FIG. 7 is a partial perspective view of a double-blade duo-cut band saw according to the fourth embodiment of the present invention.

[0146] The double-blade duo-cut band saw according to the present embodiment is characterized in that the cutting tip (150) is integrally manufactured to include the inner cutter portion (130') of the inner cutter (130).

[0147] Since the cutting tip (150) and the inner cutter (130) are manufactured as a single unit, there is a structural feature that allows the part where wear occurs in the band saw to be easily replaced.

[0148] The above cutting tip (150) includes a cutting tip portion (150') comprising a cutting clearance surface (151), a cutting bevel surface (152), a first tip mounting surface (153), and a tip fitting portion (156), and an inner cutter portion (130') that protrudes in the cutting direction from the cutting tip portion (150') and is connected to an outer cutter (120) positioned in the cutting direction.

[0149] The tip fitting part (156) is inserted into the welding groove (127), assembled, and then welded to be fixed.

[0150] In this embodiment, unlike the third embodiment, the second tip groove surface (126d) is connected in the cutting direction from the welding groove (127), and the second tip groove surface (126d) is characterized by forming a continuous curved or flat surface with the outer inclined border (121) of the cutting direction outer cutter (120).

[0151] The bottom surface of the inner cutter part (130') is formed as the second tip groove surface (126d).

[0152] In this embodiment, the entire cutting tip portion (150') and inner cutter portion (130') are formed of Stellite material.

[0153] Since the entire cutting tip portion (150') and inner cutter portion (130') can be replaced when worn out, the band saw has the feature of being able to extend its lifespan even if deformation or wear of the inner cutter (130) occurs.

[0154] The remaining configurations below are similar to the third embodiment, so a detailed description is omitted.

[0156] Although specific embodiments have been described in the detailed description of the present invention, it is understood that various modifications are possible within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof. Explanation of the symbols

[0158] 1 : Band saw 2 : Cleaning device 10: Band Club 100: Blade 110 : Blade section 120 : Outer cutter 121 : Outer slope boarder 122 : Outer cutting border 125 : Outer cutter tip 126 : Tip Home 126a : 1st tip groove surface 126b : Second tip groove surface 126c : Tip insertion slot 127 : Welding groove 130 : Inner cutter 131 : 1st Inner Cutter Border 132 : 2nd Inner Cutter Border 135 : Inner cutter tip 141 : 1st Inner Home 142 : 2nd Inner Home 150 : Cutting tip 151 : Cutting clearance 152 : Cutting rake 153 : 1st tip installation surface 154 : 2nd tip installation surface 155 : Cutting edge 156 : Tip insertion part

Claims

Claim 1 In a band saw (1), the band saw (1) comprises a band portion (10) and a blade (100) protruding outwardly from one edge of the band portion (10) in a direction intersecting the longitudinal direction of the band portion (10), the blade (100) comprises a double blade, the blade (100) comprises a blade portion (110) coupled to the edge of the band portion (10), an outer cutter (120) protruding from the blade portion (110) in a direction intersecting the longitudinal direction of the band portion (10), and an inner cutter (130) protruding from the blade portion (110) in a direction intersecting the longitudinal direction of the band portion (10) and positioned between the outer cutter (120) and the band portion (10), the outer cutter (120) comprises an outer inclined border (121) positioned in an outer direction perpendicular to the longitudinal direction of the band portion (10), and the The outer bevel border (121) forms an acute angle between the outer cutting border (122) and the band portion (10), and the outer cutting border (122) is formed to intersect toward the band portion (10), and the outer cutter tip (125) connects the outer bevel border (121) and the outer cutting border (122) at an acute angle between the outer cutting border (121) and the outer cutting border (122) and the inner cutter (130) includes a first inner cutter border (131) and a second inner cutter border (132) formed in a curved manner, and an inner cutter tip (135) formed to intersect the first inner cutter border (131) and the second inner cutter border (132), the inner cutter tip (135) is positioned in the opposite direction of cutting than the outer cutter tip (125), and a cutting tip (150) for reinforcing the durability of the outer cutter tip (125) is positioned thereon, and the A tip groove (126) is formed between the outer inclined border (121) and the outer cutting border (122) to accommodate a cutting tip (150), and the tip groove (126) comprises a first tip groove surface (126a) bent inward from the outer end of the outer inclined border (121), and a second tip groove surface (126b) bent toward the outer inclined border (121) from the outer end of the outer cutting border (122) and connected to intersect with the first tip groove surface (126a).A band saw comprising a tip fitting groove (126c) that connects the first tip groove surface (126a) and the second tip groove surface (126b) and is inserted concavely into the inner side of the outer cutter (120), and the cutting tip (150) comprises a first tip mounting surface (153) that is in close contact with the first tip groove surface (126a), a second tip mounting surface (154) that is in close contact with the second tip groove surface (126b), and a tip fitting part (156) that connects the first tip mounting surface (153) and the second tip mounting surface (154) and is inserted into the tip fitting groove (126c) to be fitted and fixed. Claim 2 delete Claim 3 delete

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