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WO2023234389A1 - Wood-cutting cutter and method for regrinding same - Google Patents

Wood-cutting cutter and method for regrinding same Download PDF

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Publication number
WO2023234389A1
WO2023234389A1 PCT/JP2023/020465 JP2023020465W WO2023234389A1 WO 2023234389 A1 WO2023234389 A1 WO 2023234389A1 JP 2023020465 W JP2023020465 W JP 2023020465W WO 2023234389 A1 WO2023234389 A1 WO 2023234389A1
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Prior art keywords
wood
cutting
hardened layer
blade
cutting edge
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PCT/JP2023/020465
Other languages
French (fr)
Japanese (ja)
Inventor
延和 二穴
誠 小笠原
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兼房株式会社
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Publication of WO2023234389A1 publication Critical patent/WO2023234389A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/46—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of disc blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/02—Structural design of saw blades or saw teeth
    • B27B33/08—Circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G13/00—Cutter blocks; Other rotary cutting tools
    • B27G13/08—Cutter blocks; Other rotary cutting tools in the shape of disc-like members; Wood-milling cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G13/00—Cutter blocks; Other rotary cutting tools
    • B27G13/12—Cutter blocks; Other rotary cutting tools for profile cutting
    • B27G13/14—Cutter blocks; Other rotary cutting tools for profile cutting for cutting grooves or tenons

Definitions

  • the present invention relates to a cutter used for cutting wood and wood-based materials.
  • a finger joint cutter which is a cutting tool used for comb-like processing before joining and combining, used in the finger joint method for wood, has a coating layer on the cutting edge of the cutting tool body made of high-speed tool steel to extend its life. may be formed.
  • the coating layer formed on the surface is susceptible to peeling and other damage due to re-polishing, so in order to obtain a good cutting edge during re-polishing, it is necessary to adjust the type of whetstone and grinding conditions to an appropriate range.
  • the bending strength of the cutting edge is weak due to its shape, which is unique to the blades used in the finger joint construction method. For this reason, blades made of high-speed tool steel may break or break due to cutting resistance during wood processing, regardless of whether or not they are regrinded.
  • the present invention was completed in view of the above-mentioned circumstances, and provides a wood-cutting knife for use in cutting wood-based materials that has a longer lifespan than high-speed tool steel and can be easily re-sharpened, and that can be easily carried out.
  • the problem to be solved is to provide a possible repolishing method.
  • the wood cutting knife of the present invention that solves the above problems has a hardened layer on the surface of the cutting edge in which the base material is modified by nitriding or carburizing, the surface hardness of the blade part is harder than 40HRC, and it is made of tool steel. be done.
  • the hardened layer formed on the surface by nitriding or carburizing is formed integrally with the base material, so unlike the coating layer, there is little risk of independently occurring damage such as peeling due to re-polishing.
  • nitriding is a process that is sometimes used for metal processing knives used for processing metals such as iron, steel, and non-ferrous metals, but it can increase the hardness of knives for processing wood-based materials.
  • a process to form a coating layer is generally performed.
  • the present invention intentionally uses a hardened layer formed by nitriding or carburizing without forming a coating layer. We are hiring.
  • FIG. 2 is a perspective view showing a finger joint cutter as a wood cutting blade used in an example.
  • a A partially enlarged perspective view of the blade portion of the finger joint cutter of the example after re-sharpening, and (b) a view seen from the rake face side.
  • They are (a) a partially enlarged perspective view of the blade portion of a finger joint cutter of a comparative example after being reground, and (b) a view seen from the rake face side.
  • the wood cutting knife of this embodiment is a knife for cutting wood-based materials. Examples include common cutters, tipped saws, router bits, square chisels, drill bits, dowel drill bits, flat blades, etc. Especially cutters with complex blade shapes, and among them, fingers used in the finger joint method. It is preferable to use it as a joint cutter.
  • the wood cutting blade of this embodiment is made of tool steel, and has a hardened layer on its surface in which the base material has been modified by nitriding or carburizing.
  • the tool steel is not particularly limited, but may include alloy tool steel, carbon tool steel, high-speed tool steel, etc. It is particularly preferable to use alloy tool steel such as die steel, which has an excellent balance between hardness and toughness.
  • the hardened layer is formed by nitriding or carburizing.
  • the hardness of the hardened layer is harder than 40 HRC.
  • the hardened layer is for improving the hardness of the cutting edge, so it is formed on at least a part of the cutting edge of the cutter (for example, 50% or more of the entire cutting edge based on the length of the cutting edge), and especially on the entire cutting edge. is preferably formed. Further, the hardened layer is preferably formed on at least one of the rake face and the flank face. By forming any one of these, a hardened layer can be formed on the cutting edge.
  • the depth of the hardened layer is not particularly limited, but examples include 10 ⁇ m, 15 ⁇ m, 20 ⁇ m, 25 ⁇ m, 30 ⁇ m, 35 ⁇ m, 40 ⁇ m, 45 ⁇ m, 50 ⁇ m, 55 ⁇ m, 60 ⁇ m, and 65 ⁇ m.
  • the method of nitriding or carburizing to form the hardened layer is not particularly limited, except that it is carried out until the surface hardness of the hardened layer becomes greater than the hardness of the base material and becomes harder than 40 HRC.
  • the lower limit of hardness includes 50HRC, 55HRC, 60HRC, 65HRC, and 69HRC.
  • the surface hardness of the hardened layer is a value measured particularly at the surface near the cutting edge.
  • one of the rake face or flank face is polished.
  • a surface different from the surface on which the hardened layer is formed is polished.
  • hardened layers are formed on both the rake face and the flank face, one may be polished.
  • the wood cutting knife of this embodiment has excellent resharpening properties, it is possible to maintain the life of the knife during wood processing and maintain a good cutting condition even after resharpening, resulting in a knife life equivalent to a new one. It will be done.
  • the regrinding method of this embodiment is a method applied to the wood cutting blade of this embodiment described above.
  • the state of the cutting edge changes. In such a case, the sharpness can be restored by re-sharpening.
  • one of the rake face and flank face is polished.
  • either surface may be polished in the first polishing. If the hardened layer is formed on only one of the rake face and flank face, polishing is performed on the surface on which the hardened layer is not formed. If re-polishing is performed more than once, the hardened layer is removed from the polished surface, so polishing is performed on the same surface that was polished (the opposite side to the side with the hardened layer).
  • polishing conditions one re-polishing is performed with a removal allowance of 2/100 mm, and the polishing is performed 10 times for a total of 2/10 mm. Further, the number of times of repolishing is approximately 30 to 40 times.
  • the wood cutting blade and regrinding method of the present invention will be explained in detail below based on Examples.
  • the wood cutting blade of this embodiment is the finger joint cutter 1 shown in FIG. 1.
  • the finger joint cutter 1 of this embodiment has a blade diameter of 170 mm.
  • the finger joint cutter 1 has a blade portion 10 and a main body 20.
  • the blade part 10 has four sets of comb shapes, 4, 3, 4, and 3, and has a total of 14 comb shapes, all of which have the same comb shape. Further, the blade portions 10 may have a comb shape of four sets of four, four, four, and four.
  • the main body 20 has a first base part 21 to which four blade parts 10 are fixed, and a second base part 22 to which three blade parts 10 are fixed, alternately arranged at 90° intervals. It is fixed to a power source (not shown) through the fixing hole 25.
  • the finger joint cutter 1 of this embodiment can also be used by stacking a plurality of them in the direction of the rotation axis.
  • the blade portion 10 of the finger joint cutter 1 was made of die steel whose surface was nitrided.
  • the die steel constituting the blade portion 10 had a hardness of 53 HRC, and the hardness of the hardened layer formed on the surface of the blade portion 10 was 69 HRC.
  • the thickness of the cured layer was 20 to 30 ⁇ m. After forming the hardened layer, the rake face was polished to create a sharp cutting edge.
  • the length of the cutting edge retreated was measured. It was defined as the amount of retreat. The amount of retraction of the cutting edge was 23.4 ⁇ m.
  • the blade portion 10 of the finger joint cutter 1 was made of high speed tool steel.
  • the hardness of the high speed tool steel constituting the blade portion 10 was 65 HRC.
  • the rake face is polished to create a sharp cutting edge.
  • the amount of retraction of the cutting edge was measured in the same manner as in the example, and the result was 38.0 ⁇ m.
  • the surface hardness of the cutting edge portion of the blade portion of the example was 69 HRC, which was higher than the hardness of the blade portion of the comparative example, which was 65 HRC.
  • the Charpy impact value of the die steel of the example and the high speed tool steel is generally 10 times or more greater for the die steel.
  • the cutting edge retraction amount of the blade portion of the example was reduced by about 40% compared to the blade portion of the high-speed tool steel of the comparative example.
  • the blade portion of the example could be regenerated by re-polishing without any burrs or chips.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dovetailed Work, And Nailing Machines And Stapling Machines For Wood (AREA)

Abstract

The present invention addresses the problem of providing a wood-cutting cutter which is used for the cutting processing of a woody material and that can be easily reground.　The wood-cutting cutter has a hardened layer provided on a surface of a cutting blade thereof, the hardened layer comprising a base material that has been modified by nitriding or carburizing. The surface hardness of a blade portion is more than 40 HRC. The wood-cutting cutter is formed of tool steel. The hardened layer formed on the surface by nitriding or carburizing is integrally formed with the base material, and is therefore less likely to experience damages that occur independently due to regrinding, such as delamination, unlike in the case of a coating layer.

Description

木材切削用刃物及びその再研磨方法Wood cutting knife and its regrinding method
　本発明は、木材および木質系材料の切削加工で用いられる刃物に関するものである。 The present invention relates to a cutter used for cutting wood and wood-based materials.
　木材および木質系材料の切削加工では、丸鋸、ルーター、カッター、錐、平刃など、用途に合わせ様々な刃物が使用されている。
　例えば、木材のフィンガージョイント工法で用いられる、接合組み合わせ前の櫛状加工に使用する刃物であるフィンガージョイントカッターでは、長寿命化のため、高速度工具鋼により構成される刃物本体の刃先にコーティング層が形成されることがある。 In cutting wood and wood-based materials, various blades are used depending on the purpose, such as circular saws, routers, cutters, drills, and flat blades.
For example, a finger joint cutter, which is a cutting tool used for comb-like processing before joining and combining, used in the finger joint method for wood, has a coating layer on the cutting edge of the cutting tool body made of high-speed tool steel to extend its life. may be formed.
　使用された後の刃物は、刃付状態を復活させるために再研磨を行うことが一般的である。表面に形成されたコーティング層は再研磨により剥離などの損傷を受けやすいため、再研磨時に良好な刃付状態を得るには、砥石の種類や研削条件を適正な範囲に調整する必要がある。 After a knife has been used, it is common to resharpen it to restore its sharpness. The coating layer formed on the surface is susceptible to peeling and other damage due to re-polishing, so in order to obtain a good cutting edge during re-polishing, it is necessary to adjust the type of whetstone and grinding conditions to an appropriate range.
　適正な再研磨条件で刃付作業を行う場合、コーティング層を形成していない刃物の再研磨よりも研磨に時間を要する他、適正な研磨条件で刃付作業を行わないと研磨品質が安定せず、刃物の寿命も安定しないため、コーティング品の再研磨は広く普及していない。 When sharpening the blade under proper re-sharpening conditions, it takes longer to sharpen than re-sharpening a blade without a coating layer, and the quality of the polishing cannot be stabilized if the sharpening work is not performed under proper re-sharpening conditions. In addition, the life of the cutter is unstable, so regrinding of coated products is not widely used.
　また、フィンガージョイント工法に用いられる刃物などに特有の事項ではあるが形状的な特徴から刃先の曲げ強度が弱い。そのため高速度工具鋼により構成される刃物では、木材加工時の切削抵抗により再研磨の有無に関わらず折損や破損が生じることがある。 Additionally, the bending strength of the cutting edge is weak due to its shape, which is unique to the blades used in the finger joint construction method. For this reason, blades made of high-speed tool steel may break or break due to cutting resistance during wood processing, regardless of whether or not they are regrinded.
特開2003-048203号公報Japanese Patent Application Publication No. 2003-048203 特開平9-99404号公報Japanese Patent Application Publication No. 9-99404 特許第3191238号公報Patent No. 3191238 特許第3200665号公報Patent No. 3200665
　本発明は上記実情に鑑み完成したものであり、高速度工具鋼製より長寿命でありながら、再研磨を容易に行うことができる木質系材料の切削加工に用いる木材切削用刃物及び容易に実施可能な再研磨方法を提供することを解決すべき課題とする。 The present invention was completed in view of the above-mentioned circumstances, and provides a wood-cutting knife for use in cutting wood-based materials that has a longer lifespan than high-speed tool steel and can be easily re-sharpened, and that can be easily carried out. The problem to be solved is to provide a possible repolishing method.
　上記課題を解決する本発明の木材切削用刃物は、窒化又は浸炭により基材が改質された硬化層を切れ刃の表面にもち、刃部の表面硬さが４０ＨＲＣより硬く、工具鋼から形成される。 The wood cutting knife of the present invention that solves the above problems has a hardened layer on the surface of the cutting edge in which the base material is modified by nitriding or carburizing, the surface hardness of the blade part is harder than 40HRC, and it is made of tool steel. be done.
　窒化又は浸炭により表面に形成される硬化層は、基材と一体的に形成されているため、コーティング層とは異なり剥離するなどの独立して生起する損傷が再研磨により生じるおそれが少ない。 The hardened layer formed on the surface by nitriding or carburizing is formed integrally with the base material, so unlike the coating layer, there is little risk of independently occurring damage such as peeling due to re-polishing.
　なお、窒化処理は、鉄、鋼、非鉄金属などの金属加工に用いる金属加工用の刃物においては採用されることがある処理であるが、木質系材料の加工用刃物では、硬度をより高くできるコーティング層を形成する処理が一般的には行われている。 Note that nitriding is a process that is sometimes used for metal processing knives used for processing metals such as iron, steel, and non-ferrous metals, but it can increase the hardness of knives for processing wood-based materials. A process to form a coating layer is generally performed.
　本発明は、木質系材料の切削用刃物において、コーティング層が存在することで再研磨の問題が生じた場合の解決方法として、敢えてコーティング層を形成せずに窒化や浸炭により形成した硬化層を採用している。 As a solution to the problem of re-grinding caused by the presence of a coating layer in cutting tools made of wood-based materials, the present invention intentionally uses a hardened layer formed by nitriding or carburizing without forming a coating layer. We are hiring.
実施例で用いた木材切削用刃物としてのフィンガージョイントカッターを示す斜視図である。FIG. 2 is a perspective view showing a finger joint cutter as a wood cutting blade used in an example. 実施例のフィンガージョイントカッターを再研磨した後の（ａ）刃部の部分拡大斜視図、（ｂ）すくい面側から見た図である。(a) A partially enlarged perspective view of the blade portion of the finger joint cutter of the example after re-sharpening, and (b) a view seen from the rake face side. 比較例のフィンガージョイントカッターを再研磨した後の（ａ）刃部の部分拡大斜視図、（ｂ）すくい面側から見た図である。They are (a) a partially enlarged perspective view of the blade portion of a finger joint cutter of a comparative example after being reground, and (b) a view seen from the rake face side.
（木材切削用刃物）
　本実施形態の木材切削用刃物は、木質系材料を切削加工するための刃物である。例えば、カッター、チップソー、ルータービット、角のみ、錐、ダボ錐、平刃などの一般的なものが例示でき、特に刃体の形状が複雑なものであるカッター、その中でもフィンガージョイント工法に用いるフィンガージョイントカッターに採用することが好ましい。 (Knives for wood cutting)
The wood cutting knife of this embodiment is a knife for cutting wood-based materials. Examples include common cutters, tipped saws, router bits, square chisels, drill bits, dowel drill bits, flat blades, etc. Especially cutters with complex blade shapes, and among them, fingers used in the finger joint method. It is preferable to use it as a joint cutter.
　本実施形態の木材切削用刃物は、工具鋼から形成されており、窒化又は浸炭により基材が改質された硬化層を表面にもつ。工具鋼としては特に限定しないが、合金工具鋼、炭素工具鋼、高速度工具鋼などであり、特にダイス鋼などの硬度と靭性のバランスに優れた合金工具鋼を採用することが好ましい。 The wood cutting blade of this embodiment is made of tool steel, and has a hardened layer on its surface in which the base material has been modified by nitriding or carburizing. The tool steel is not particularly limited, but may include alloy tool steel, carbon tool steel, high-speed tool steel, etc. It is particularly preferable to use alloy tool steel such as die steel, which has an excellent balance between hardness and toughness.
　硬化層は、窒化又は浸炭により形成される。硬化層は、硬さが４０ＨＲＣより硬い。硬化層は、切れ刃の硬度を向上させるためのものであるため、少なくとも刃物の切れ刃の一部（例えば切れ刃の長さを基準として全体の５０％以上）に形成され、特に切れ刃全体に形成されることが好ましい。また硬化層はすくい面及び逃げ面のうちの少なくとも一方に形成されていることが好ましい。これらの何れかに形成することで切れ刃に硬化層が形成できる。硬化層の深さは特に限定しないが、１０μｍ、１５μｍ、２０μｍ、２５μｍ、３０μｍ、３５μｍ、４０μｍ、４５μｍ、５０μｍ、５５μｍ、６０μｍ、６５μｍなどが例示できる。 The hardened layer is formed by nitriding or carburizing. The hardness of the hardened layer is harder than 40 HRC. The hardened layer is for improving the hardness of the cutting edge, so it is formed on at least a part of the cutting edge of the cutter (for example, 50% or more of the entire cutting edge based on the length of the cutting edge), and especially on the entire cutting edge. is preferably formed. Further, the hardened layer is preferably formed on at least one of the rake face and the flank face. By forming any one of these, a hardened layer can be formed on the cutting edge. The depth of the hardened layer is not particularly limited, but examples include 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, and 65 μm.
　硬化層を形成する窒化処理や浸炭処理の方法は、硬化層の表面硬さが基材の硬さよりも硬度が大きくなり、４０ＨＲＣより硬くなるまで行うこと以外は特に限定しない。更に硬度の下限値としては、５０ＨＲＣ、５５ＨＲＣ、６０ＨＲＣ、６５ＨＲＣ、６９ＨＲＣが挙げられる。硬化層の表面硬さは、特に切れ刃近傍の表面で測定する値である。 The method of nitriding or carburizing to form the hardened layer is not particularly limited, except that it is carried out until the surface hardness of the hardened layer becomes greater than the hardness of the base material and becomes harder than 40 HRC. Furthermore, the lower limit of hardness includes 50HRC, 55HRC, 60HRC, 65HRC, and 69HRC. The surface hardness of the hardened layer is a value measured particularly at the surface near the cutting edge.
　すくい面又は逃げ面のうちの一面が研磨されていることが好ましい。すくい面及び逃げ面のうち硬化層が形成された面とは異なる面が研磨されていることが好ましい。又は、すくい面及び逃げ面の双方に硬化層が形成されているときに一方を研磨したものであっても良い。 It is preferable that one of the rake face or flank face is polished. Of the rake face and flank face, it is preferable that a surface different from the surface on which the hardened layer is formed is polished. Alternatively, when hardened layers are formed on both the rake face and the flank face, one may be polished.
　本実施形態の木材切削用刃物は再研磨性に優れているため、木材加工時の刃物寿命を維持しつつ、再研磨後にも良好な刃付状態を維持出来ることで新品同等の刃物寿命が得られる。 Since the wood cutting knife of this embodiment has excellent resharpening properties, it is possible to maintain the life of the knife during wood processing and maintain a good cutting condition even after resharpening, resulting in a knife life equivalent to a new one. It will be done.
（再研磨方法）
　本実施形態の再研磨方法は、上述した本実施形態の木材切削用刃物について適用する方法である。本実施形態の木材切削用刃物を使用して木質系材料を切削加工すると、刃付状態が変化してくる。そうしたときに再研磨することにより刃付状態を回復することができる。 (Re-polishing method)
The regrinding method of this embodiment is a method applied to the wood cutting blade of this embodiment described above. When a wood-based material is cut using the wood-cutting knife of this embodiment, the state of the cutting edge changes. In such a case, the sharpness can be restored by re-sharpening.
　本実施形態の再研磨方法は、すくい面及び逃げ面のうちの一面に対して研磨を行う。すくい面及び逃げ面の双方に硬化層が形成されている場合には、最初の研磨ではどちらの面に研磨を行っても良い。すくい面及び逃げ面の一方にしか硬化層が形成されていない場合には、硬化層が形成されていない面に対して研磨を行う。再研磨を一度以上行った場合には、研磨を行った面は硬化層が除去されるため、研磨を行った同じ面（硬化層が有る方とは反対の面）について研磨を行う。研磨条件の一例としては、1回の再研磨で２／１００ｍｍの取り代を１０回で合計２／１０ｍｍの研磨を行う。また、再研磨の回数は３０～４０回程実施する。 In the repolishing method of this embodiment, one of the rake face and flank face is polished. When the hardened layer is formed on both the rake face and the flank face, either surface may be polished in the first polishing. If the hardened layer is formed on only one of the rake face and flank face, polishing is performed on the surface on which the hardened layer is not formed. If re-polishing is performed more than once, the hardened layer is removed from the polished surface, so polishing is performed on the same surface that was polished (the opposite side to the side with the hardened layer). As an example of polishing conditions, one re-polishing is performed with a removal allowance of 2/100 mm, and the polishing is performed 10 times for a total of 2/10 mm. Further, the number of times of repolishing is approximately 30 to 40 times.
　以下に本発明の木材切削用刃物及び再研磨方法について実施例に基づき詳細に説明を行う。本実施例の木材切削用刃物は、図１に示すフィンガージョイントカッター１である本実施例のフィンガージョイントカッター１は、刃径が１７０ｍｍである。フィンガージョイントカッター１は、刃部１０と本体２０とをもつ。刃部１０は４つ、３つ、４つ、３つの４組の櫛形状で、計１４個の山形状からなり、すべて同じ山形状をもつ。また、刃部１０が４つ、４つ、４つ、４つの４組の櫛形状となる場合もある。本体２０は、刃部１０が４つ固定される第１基部２１、刃部１０が３つ固定される第２基部２２を９０°置きに交互にもつ。固定孔２５により動力源（図略）に固定される。本実施例のフィンガージョイントカッター１は複数を回転軸方向に積層して使用することもできる。 The wood cutting blade and regrinding method of the present invention will be explained in detail below based on Examples. The wood cutting blade of this embodiment is the finger joint cutter 1 shown in FIG. 1. The finger joint cutter 1 of this embodiment has a blade diameter of 170 mm. The finger joint cutter 1 has a blade portion 10 and a main body 20. The blade part 10 has four sets of comb shapes, 4, 3, 4, and 3, and has a total of 14 comb shapes, all of which have the same comb shape. Further, the blade portions 10 may have a comb shape of four sets of four, four, four, and four. The main body 20 has a first base part 21 to which four blade parts 10 are fixed, and a second base part 22 to which three blade parts 10 are fixed, alternately arranged at 90° intervals. It is fixed to a power source (not shown) through the fixing hole 25. The finger joint cutter 1 of this embodiment can also be used by stacking a plurality of them in the direction of the rotation axis.
（実施例）
　フィンガージョイントカッター１の刃部１０について表面を窒化処理したダイス鋼により形成した。刃部１０を構成するダイス鋼は硬度が５３ＨＲＣ、刃部１０の表面に形成された硬化層の硬度は６９ＨＲＣであった。硬化層の厚みは２０～３０μｍであった。硬化層を形成後、すくい面を研磨することで刃付を行って鋭利な刃先とした。 (Example)
The blade portion 10 of the finger joint cutter 1 was made of die steel whose surface was nitrided. The die steel constituting the blade portion 10 had a hardness of 53 HRC, and the hardness of the hardened layer formed on the surface of the blade portion 10 was 69 HRC. The thickness of the cured layer was 20 to 30 μm. After forming the hardened layer, the rake face was polished to create a sharp cutting edge.
　このフィンガージョイントカッター１を用いてＭＤＦ（木質材）を切込深さ５ｍｍ、刃物回転数５０００ｒｐｍ、送り速度５ｍ／分、切削材長１２ｍで加工した後に刃先が後退した長さを測定して刃先後退量とした。刃先後退量は２３．４μｍであった。 After processing MDF (wood material) using this finger joint cutter 1 at a cutting depth of 5 mm, a blade rotation speed of 5000 rpm, a feed rate of 5 m/min, and a cutting material length of 12 m, the length of the cutting edge retreated was measured. It was defined as the amount of retreat. The amount of retraction of the cutting edge was 23.4 μm.
　次にＣＢＮの回転砥石を用いて３，０００ｒｐｍで５５秒間再研磨を行った。その結果、刃先にバリや欠けの発生は認められなかった（図２参照）。 Next, re-polishing was performed using a CBN rotating grindstone at 3,000 rpm for 55 seconds. As a result, no burrs or chips were observed on the cutting edge (see Figure 2).
（比較例）
　フィンガージョイントカッター１の刃部１０について高速度工具鋼により形成した。刃部１０を構成する高速度工具鋼は硬度が６５ＨＲＣであった。すくい面を研磨することで刃付を行って鋭利な刃先とした。 (Comparative example)
The blade portion 10 of the finger joint cutter 1 was made of high speed tool steel. The hardness of the high speed tool steel constituting the blade portion 10 was 65 HRC. The rake face is polished to create a sharp cutting edge.
　本比較例のフィンガージョイントカッター１を用いて実施例と同様に刃先後退量を測定した結果、３８．０μｍであった。 Using the finger joint cutter 1 of this comparative example, the amount of retraction of the cutting edge was measured in the same manner as in the example, and the result was 38.0 μm.
　フィンガージョイントカッター１の刃部１０について高速度工具鋼とコーティングにより形成したすくい面を再研磨したところ、基材のバリやコーティングの欠けの発生が認められた（図３）。 When the rake face of the blade part 10 of the finger joint cutter 1, which was formed by high-speed tool steel and coating, was re-polished, burrs on the base material and chips in the coating were observed (Figure 3).
（考察）
　実施例の刃部は刃先部分の表面の硬度が６９ＨＲＣであり、比較例の刃部の硬度６５ＨＲＣよりも高い硬度となっていることが分かった。また、靭性は実施例のダイス鋼と高速度工具鋼のシャルピー衝撃値は一般的にダイス鋼の方が１０倍以上大きい。そして実施例の刃部は、比較例の高速度工具鋼の刃部と比べて刃先後退量が四割程度減少した。実施例の刃部は、再研磨によりバリや欠けの発生もなく再生することが可能であった。 (Consideration)
It was found that the surface hardness of the cutting edge portion of the blade portion of the example was 69 HRC, which was higher than the hardness of the blade portion of the comparative example, which was 65 HRC. Further, regarding the toughness, the Charpy impact value of the die steel of the example and the high speed tool steel is generally 10 times or more greater for the die steel. The cutting edge retraction amount of the blade portion of the example was reduced by about 40% compared to the blade portion of the high-speed tool steel of the comparative example. The blade portion of the example could be regenerated by re-polishing without any burrs or chips.
　このように表面に窒化により硬化層を形成することで優れた刃部を提供することが分かった。 It has been found that forming a hardened layer on the surface by nitriding provides an excellent blade.
　１…フィンガージョイントカッター
　１０…刃部　　２０…本体　　２１…第１基部　　２２…第２基部
　２５…固定孔
  1... Finger joint cutter 10... Blade portion 20... Main body 21... First base 22... Second base 25... Fixing hole

Claims (4)

  1. 　窒化又は浸炭により基材が改質された硬化層を切れ刃の表面にもち、
    　刃部の表面硬さが４０ＨＲＣより硬く、
    　工具鋼から形成される木材切削用刃物。     The cutting edge has a hardened layer whose base material has been modified by nitriding or carburizing,
    The surface hardness of the blade is harder than 40HRC,
    A wood cutting knife made from tool steel.
  2. 　前記刃部の表面硬さが、６５ＨＲＣ以上である請求項１に記載の木材切削用刃物。 The wood cutting knife according to claim 1, wherein the surface hardness of the blade portion is 65HRC or more.
  3. 　前記硬化層が形成された後、刃部のすくい面及び逃げ面のうちの１面が研磨されている請求項１又は２に記載の木材切削用刃物。 The wood cutting blade according to claim 1 or 2, wherein one of the rake face and flank face of the blade portion is polished after the hardened layer is formed.
  4. 　請求項１又は２に記載の木材切削用刃物において、
    　前記木材切削用刃物のすくい面又は逃げ面を研磨する再研磨方法。
          The wood cutting knife according to claim 1 or 2,
    A regrinding method for polishing the rake face or flank face of the wood cutting blade.
PCT/JP2023/020465 2022-06-02 2023-06-01 Wood-cutting cutter and method for regrinding same WO2023234389A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980711A (en) * 1982-09-23 1984-05-10 ナシヨナル・リサ−チ・デイベロツプメント・コ−ポレイシヨン Removal phosphorus from iron
JPS60141213A (en) * 1983-12-27 1985-07-26 山田機械工業株式会社 Rotary blade for pruning machine
JPH049449A (en) * 1990-04-27 1992-01-14 Nippon Seiko Kk Rolling bearing
JP2002275581A (en) * 2001-03-21 2002-09-25 Honda Motor Co Ltd Steel material
WO2015064010A1 (en) * 2013-11-01 2015-05-07 兼房株式会社 Blade for cutting wood and cutting tool using same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980711A (en) * 1982-09-23 1984-05-10 ナシヨナル・リサ−チ・デイベロツプメント・コ−ポレイシヨン Removal phosphorus from iron
JPS60141213A (en) * 1983-12-27 1985-07-26 山田機械工業株式会社 Rotary blade for pruning machine
JPH049449A (en) * 1990-04-27 1992-01-14 Nippon Seiko Kk Rolling bearing
JP2002275581A (en) * 2001-03-21 2002-09-25 Honda Motor Co Ltd Steel material
WO2015064010A1 (en) * 2013-11-01 2015-05-07 兼房株式会社 Blade for cutting wood and cutting tool using same

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