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WO2022064595A1 - Fraise cylindrique deux tailles - Google Patents

Fraise cylindrique deux tailles Download PDF

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Publication number
WO2022064595A1
WO2022064595A1 PCT/JP2020/036022 JP2020036022W WO2022064595A1 WO 2022064595 A1 WO2022064595 A1 WO 2022064595A1 JP 2020036022 W JP2020036022 W JP 2020036022W WO 2022064595 A1 WO2022064595 A1 WO 2022064595A1
Authority
WO
WIPO (PCT)
Prior art keywords
outer peripheral
blade
end mill
conical surface
central axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/036022
Other languages
English (en)
Japanese (ja)
Inventor
誠 馬場
隆浩 北川
恭行 奥村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Moldino Tool Engineering Ltd
Original Assignee
Moldino Tool Engineering Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Moldino Tool Engineering Ltd filed Critical Moldino Tool Engineering Ltd
Priority to JP2021509940A priority Critical patent/JP6892037B1/ja
Priority to PCT/JP2020/036022 priority patent/WO2022064595A1/fr
Publication of WO2022064595A1 publication Critical patent/WO2022064595A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft

Definitions

  • the present invention relates to an end mill used for deep digging of metal.
  • a neck part with a diameter smaller than the blade diameter may be provided between the cutting edge part and the shank part, or the shank part diameter may be changed.
  • step machining is performed using a tool having a diameter smaller than that of the blade. In such a tool, the edge (rear end portion) of the outer peripheral blade becomes sharp, and when it bites into the material to be cut, a step is formed on the machined surface, which may deteriorate the quality of the machined surface.
  • an arcuate outer peripheral blade that smoothly connects to the outer peripheral blade on the tip side is formed at the rear end of the outer peripheral blade as in Patent Document 1, or the rotation locus of the entire outer peripheral blade is bell-shaped as in Patent Document 2.
  • Disclosed is a technique for suppressing the formation of a step on the surface to be machined by forming the outer peripheral blade.
  • the present invention has been made under such a background, and provides an end mill capable of easily manufacturing a tool itself, reducing biting into a material to be cut, and improving the quality of a machined surface.
  • the purpose is to do.
  • the end mill of the present embodiment has a shank portion extending along the central axis and a blade portion located on the tip end side of the shank portion and having a plurality of outer peripheral blades extending spirally around the central axis along the circumferential direction.
  • the shank portion has an outer diameter smaller than the outer diameter of the rear end of the outer peripheral blade on the shank portion side at least at the connection portion with the blade portion, and the blade portion and the shank portion.
  • a conical surface is provided at the boundary of the blade, which is continuous with the rear end of the outer peripheral blade and whose rotation locus around the central axis forms a conical trapezoidal shape.
  • a part of the side surface of a cone which is continuous with the rear end of the outer peripheral blade on the shank portion side at the boundary between the blade portion and the shank portion and whose rotation locus around the central axis is a truncated cone.
  • the flank of the outer peripheral blade may extend to the rear side in the rotation direction of the conical surface.
  • the blade portion is provided with a plurality of chip discharge grooves spirally extending in the circumferential direction between the outer peripheral blades arranged in the circumferential direction, and the rear end of the chip discharge groove.
  • the side end may be configured to be adjacent to the conical surface in the circumferential direction.
  • the area of the conical surface does not become too large, it becomes easy to realize a conical surface that rubs appropriately against the surface to be machined, and the quality of the machined surface can be further improved.
  • the angle formed by the rotation locus of the outer peripheral blade and the rotation locus of the conical surface may be in the range of 155 ° to 175 °.
  • the corner of the boundary portion between the outer peripheral blade and the conical surface is less likely to bite into the work surface, and it is possible to prevent the work surface from becoming rough.
  • the area of the conical surface does not become too large, it becomes easy to realize a conical surface that appropriately rubs against the surface to be machined, and the quality of the machined surface can be further improved.
  • the blade portion has a shape reduced in a back taper shape so that the outer diameter of the outer peripheral blade gradually decreases from the tip end toward the shank portion.
  • the back taper amount of the portion may be 0.020 mm or less.
  • FIG. 1 is a side view of a tip end portion of an end mill body showing an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of an end mill main body showing an embodiment of the present invention in a plane including a central axis O of a rotation locus.
  • FIG. 3 is an enlarged view showing a region surrounded by a two-dot chain line of the end mill main body of the embodiment shown in FIG. 1.
  • FIG. 4 is an enlarged side view showing a region surrounded by the alternate long and short dash line of the end mill main body of the embodiment shown in FIG.
  • FIG. 5 is a cross-sectional view taken along the line AA in the direction intersecting the axial direction at the tip end portion of the end mill body shown in FIG.
  • FIG. 6 is a cross-sectional view taken along the line BB in the direction intersecting the axial direction at the tip end portion of the end mill body shown in FIG.
  • FIG. 1 is a side view showing a tip end portion of an end mill main body showing an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of an end mill main body showing an embodiment of the present invention in a plane including a central axis O of a rotation locus.
  • FIG. 3 is an enlarged view showing a region surrounded by a two-dot chain line of the end mill main body of the embodiment shown in FIG. 1.
  • FIG. 4 is an enlarged side view showing a region surrounded by the alternate long and short dash line of the end mill main body of the embodiment shown in FIG.
  • FIG. 5 is a cross-sectional view taken along the line AA in the direction intersecting the axial direction at the tip end portion of the end mill body shown in FIG.
  • FIG. 6 is a cross-sectional view taken along the line BB in the direction intersecting the axial direction at the tip end portion of the end mill body shown in FIG.
  • the end mill 10 of the present embodiment has an axial shape of a substantially cylindrical shape extending along the axial direction with the central axis O as the center.
  • the end mill 10 is made of a hard material such as cemented carbide.
  • axis direction the direction parallel to the central axis O of the end mill 10
  • diameter direction the direction orthogonal to the central axis O
  • circumferential direction the direction of orbiting around the central axis O.
  • the direction in which the end mill 10 rotates during cutting is called the tool rotation direction T.
  • the end mill 10 is used for cutting (rolling) a material to be cut such as a metal material.
  • the end mill 10 of the present embodiment is a radius end mill, and the standing wall is processed by contour line processing.
  • the radius end mill is exemplified, but any other shape may be used as long as it is an end mill for processing a standing wall by contour line processing, and for example, a square end mill may be used.
  • the material to be cut processed by the end mill 10 is, for example, a nest of a mold for resin molding.
  • the end mill 10 has a shank portion 11 and a blade portion 13 located on the tip end side of the shank portion 11.
  • the shank portion 11 has a columnar shank portion main body 11a and a small-diameter neck portion 12 connecting the shank portion main body 11a and the blade portion 13.
  • the neck portion 12 is provided, but in the present invention, at least the connection portion (tip of the shank portion 11) with the blade portion 13 of the shank portion 11 has an outer diameter smaller than the outer diameter of the rear end of the blade portion 13.
  • the entire shank portion 11 may have an outer diameter smaller than the outer diameter of the rear end of the blade portion 13.
  • the blade portion 13, the neck portion 12, and the shank portion main body 11a are arranged in this order along the central axis O from the front end side (+ X direction side) to the rear end side ( ⁇ X direction side).
  • the shank portion main body 11a is a columnar shape centered on the central axis O.
  • the shank portion main body 11a is located on the rear end side of the end mill 10.
  • the end mill 10 is gripped by the machine tool in the shank portion main body 11a and rotated in the tool rotation direction T around the axis of the central axis O. Further, the end mill 10 is given a feed in a direction intersecting the central axis O together with rotation around the central axis O by a machine tool to process the material to be cut.
  • the shape of the shank portion main body 11a may be changed according to the shape of the machine tool side.
  • the neck portion 12 is a columnar shape centered on the central axis O.
  • the neck portion 12 is located on the tip end side (+ X direction side) of the shank portion main body 11a.
  • the outer diameter of the neck portion 12 is smaller than the outer diameter of the shank portion main body 11a.
  • a tapered surface 11b whose outer diameter decreases toward the neck portion 12 is formed.
  • the blade portion 13 is located on the tip end side (+ X direction side) of the neck portion 12.
  • the blade portion 13 has four outer peripheral blades 14, four corner blades 15 continuous with the outer peripheral blade 14 on the tip end side of the outer peripheral blade 14, and four corner blades 15 continuous with the corner blade 15 on the tip end side of the corner blade 15, respectively.
  • a bottom blade 16 is provided.
  • the blade portion 13 in the present embodiment has a shape reduced in a back taper shape so that the outer diameter of the outer peripheral blade 14 gradually decreases from the tip end to the rear end side (neck portion 12 side).
  • the back taper amount of the outer peripheral blade 14 is preferably in the range of 0.020 mm or less, more preferably in the range of 0.005 to 0.015 mm.
  • the stronger the back taper the less the verticality of the outer peripheral blade 14, so the amount of uncut portion of the standing wall when processing the standing wall increases. Therefore, in order to improve the dimensional accuracy of the surface to be machined, it is preferable that the back taper is as small as possible. On the other hand, if there is no back taper or the back taper is weak, the contact between the outer peripheral blade 14 and the material to be cut increases and chatter vibration occurs, or the work surface becomes rough and cloudy, and the work surface becomes cloudy. The dignity will deteriorate.
  • the back taper of the blade portion 13 by setting the back taper of the blade portion 13 within the above range, the amount of uncut portion of the standing wall can be reduced and the deterioration of the quality of the work surface can be suppressed.
  • the four outer peripheral blades 14 are arranged at equal intervals along the circumferential direction on the outer periphery of the blade portion 13.
  • the four corner blades 15 are arranged at equal intervals along the circumferential direction between the outer peripheral blade 14 and the bottom blade 16.
  • the four bottom blades 16 are arranged at equal intervals along the circumferential direction at the tip of the blade portion 13.
  • the outer peripheral blade 14 is a twisted blade that extends spirally around the central axis O.
  • the outer peripheral blade 14 is spirally twisted at a constant helix angle ⁇ in the tool rotation direction T from the rear end side to the tip side of the end mill 10.
  • the helix angles of the four outer peripheral blades 14 are the same as each other.
  • the end mill 10 of the present embodiment can also be an end mill with unequal division and unequal leads.
  • the outer diameter dimension D of the rear end of the outer peripheral blade 14 is larger than the connection portion of the shank portion 11 with the blade portion 13. In the present embodiment, the outer diameter dimension D of the rear end of the outer peripheral blade 14 is larger than the outer diameter dimension d of the neck portion 12.
  • a chip discharge groove 24 is formed between the outer peripheral blades 14 in the circumferential direction.
  • the plurality of chip discharge grooves 24 are formed at equal intervals in the circumferential direction.
  • the chip discharge groove 24 is spirally twisted at a constant helix angle along the axial direction.
  • the helix angle of the chip discharge groove 24 coincides with the helix angle ⁇ of the outer peripheral blade 14.
  • the rear end side of the chip discharge groove 24 is cut up to the outer periphery of the end mill 10 and extends toward the conical surface 17.
  • An outer peripheral blade 14 is formed on the edge of the chip discharge groove 24 on the rear side in the tool rotation direction. That is, the chip discharge groove 24 is located on the front side of the outer peripheral blade 14 in the tool rotation direction.
  • the wall surface of the chip discharge groove 24 includes a bottom surface and a rake face 24b.
  • the bottom surface 24a is a surface of the chip discharge groove 24 facing outward in the radial direction with respect to the central axis O.
  • the rake face 24b is a wall surface facing the tool rotation direction T in the chip discharge groove 24.
  • the outer peripheral blade 14 is formed on the outer peripheral surface of the blade portion 13 at the intersecting ridge line between the rake surface 24b and the flank surface 25.
  • the flank 25 is a surface adjacent to the chip discharge groove 24 on the rear side in the rotation direction.
  • the flank 25 extends in a series in the circumferential direction from the outer peripheral blade 14 toward the chip discharge groove 24 on the rear side in the rotation direction of the outer peripheral blade 14.
  • the outer peripheral blade 14 of the present embodiment has a two-step flank. That is, the flank 25 of the outer peripheral blade 14 has a first flank 25a and a second flank 25b arranged along the circumferential direction.
  • the first flank 25a is located on the outer peripheral blade 14 side (front side in the tool rotation direction T).
  • the second flank 25b is located on the chip discharge groove 24 side (rear side in the tool rotation direction T).
  • the first flank surface 25a and the second flank surface 25b are formed in an arc shape centered on different positions in a cross section orthogonal to the central axis O.
  • the clearance angle of the second flank surface 25b is larger than the clearance angle of the first flank surface 25a.
  • the end mill 10 of the present embodiment has the rear end side (end portion on the neck portion 12 side) of each outer peripheral blade 14 at the boundary between each outer peripheral blade 14 of the blade portion 13 and the neck portion 12. ) Has a continuous conical surface 17. In other words, it separates the rear end of the outer peripheral blade 14 (the end on the shank portion 11 side) and the tip of the shank portion 11 (the end on the blade portion 13 side) having a diameter smaller than the rear end of the outer peripheral blade 14.
  • the conical surface 17 is provided.
  • the conical surface 17 is an outer peripheral surface of the end mill 10 in which the rotation locus around the central axis O has a truncated cone shape. That is, the end mill 10 has a conical surface 17 continuous with the rear end of the outer peripheral blade 14 on the shank portion 11 side at the boundary between the blade portion 13 and the shank portion 11.
  • the rotation locus around the central axis becomes conical.
  • the conical surface 17 is formed.
  • the blade length of the outer peripheral blade 14 is formed in advance to be longer than the blade length of the product, and is determined to be the blade length of the product by tapering grinding to form the conical surface 17. As a result, a smoothly continuous conical surface 17 can be easily formed at the rear end of the outer peripheral blade 14.
  • the rotation locus of the conical surface 17 draws a cone whose diameter is reduced from the outer peripheral blade 14 side toward the shank portion 11 portion side. Further, as shown in FIG. 6, when the conical surface 17 is viewed from the axial direction, it forms an arc shape along the circle of the rotation locus around the axis. As shown in FIGS. 5 and 6, the rotation locus RT2 of the conical surface 17 is formed radially inside the rotation locus RT1 of the outer peripheral blade 14 around the axis.
  • the tip end side in the axial direction is continuous with the rear end side of the outer peripheral blade 14, and the rear end side is continuous with the cylindrical surface 12a which is the outer peripheral surface of the neck portion 12.
  • the conical surface 17 has no clearance angle or has a very small clearance angle. That is, the ridgeline between the conical surface 17 and the rake surface 24b on the front side of the conical surface 17 in the tool rotation direction T is not a cutting edge.
  • the conical surface 17 of the present embodiment is not a flank surface, but a surface that hardly contacts the surface to be machined or that contacts the surface to be machined so as to be appropriately rubbed.
  • the conical surface 17 of the present embodiment is a surface that recedes toward the radial center axis side with respect to the rear end of the outer peripheral blade 14 but does not recede with respect to the rotation locus.
  • the conical surface 17 it is difficult for the end portion of the outer peripheral blade 14 to bite into the surface to be machined, and it is possible to prevent the surface to be machined from becoming rough, and the conical surface 17 is the surface to be cut. Can be appropriately rubbed and polished to improve the quality of the surface to be machined.
  • chip discharge grooves 24 exist between the outer peripheral blades 14 adjacent to each other in the circumferential direction.
  • the chip discharge groove 24 extends in the axial direction in a spiral in the circumferential direction, and extends to a position where the rear end side is adjacent to the conical surface 17 in the circumferential direction. That is, in the circumferential direction, the rear end side portion of the chip discharge groove 24 and the conical surface 17 are alternately present. With this configuration, chips are efficiently discharged from the chip discharge groove 24 during step processing.
  • the entire conical surface 17 is adjacent to the chip discharge groove 24 in the circumferential direction, but if at least a part of the conical surface 17 and the chip discharge groove 24 are adjacent to each other in the circumferential direction. good.
  • the angle formed by the outer peripheral blade 14 and the conical surface 17 that is, in the cross section in the plane including the central axis O, the angle formed by the rotation locus of the outer peripheral blade 14 and the rotation locus of the conical surface 17 is an blunt angle.
  • the angle ⁇ is preferably in the range of 155 ° to 175 °. Further, it is more preferably in the range of 160 ° to 175 °, and particularly preferably in the range of 165 ° to 170 °.
  • the angle ⁇ formed by the outer peripheral blade 14 and the conical surface 17 is smaller than the above angle range, the angle of the end blade (the boundary portion between the outer peripheral blade 14 and the conical surface 17) of the outer peripheral blade 14 tends to bite into the surface to be machined. , The surface to be machined tends to be rough. Further, even when the angle is larger than the above angle range, the area of the conical surface 17 that rubs against the surface to be machined becomes too large, and the surface to be machined tends to be roughened.
  • the end mill 10 in the present embodiment can collectively form continuous conical surfaces 17 on each rear end side of a plurality of outer peripheral blades 14 by simply adding taper cutting to the manufacturing process of the conventional end mill.
  • the tool itself can be easily manufactured and the manufacturing cost can be suppressed.
  • the end mill 10 of the present embodiment by providing the conical surface 17 on the rear end side of each outer peripheral blade 14, it becomes difficult for the end blade of the outer peripheral blade 14 to bite into the surface to be machined. It is possible to prevent the surface to be machined from becoming rough, and the conical surface can appropriately rub and polish the surface to be machined to improve the quality of the surface to be machined.
  • the conical surface 17 is not a flank surface, and the conical surface 17 appropriately rubs the surface to be machined to give a glossy feeling to the surface to be machined, so that the quality of the surface to be machined can be improved. Is. Further, since the area where the conical surface 17 and the surface to be processed rub against each other does not become too large, it is possible to prevent the surface to be processed from becoming cloudy.
  • the angle between the rotation locus of the outer peripheral blade 14 and the rotation locus of the conical surface 17 is before and after regrinding. Since it does not change, a stable and high-quality machined surface can be obtained regardless of the number of regrindings.
  • the flank 25 of the outer peripheral blade 14 extends to the rear side in the rotation direction of the conical surface 17, and the plurality of conical surfaces 17 and the plurality of chip discharge grooves 24 are alternately arranged in the circumferential direction. Will be done. As a result, the area of the conical surface 17 does not become too large, and it becomes easy to realize the conical surface 17 that appropriately rubs the surface to be machined.
  • the configuration having the neck portion 12 has been described, but the configuration without the neck portion 12 may be used.
  • the boundary portion between the outer peripheral blade 14 and the shank portion 11 of the blade portion 13 is conical.
  • the surface 17 may be formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

L'invention a pour objet de fournir une fraise cylindrique deux tailles qui est mise en œuvre dans un usinage de creusage profond, qui est telle que l'outil lui-même est facile à fabriquer, et qui attaque moins l'objet à couper et permet ainsi d'améliorer la qualité d'une face à usiner. La fraise cylindrique deux tailles de l'invention est équipée : d'une partie queue se prolongeant suivant un axe central ; et d'une partie lame qui est positionnée côté extrémité avant de ladite partie queue, et dans laquelle une pluralité de lames périphériques externes se prolongeant de manière hélicoïdale autour dudit axe central, est agencée suivant la direction périphérique. Ladite partie queue possède un diamètre externe plus petit que celui du diamètre externe d'une extrémité arrière desdites lames périphériques externes côté partie queue, au moins dans une région de connexion vis-à-vis de ladite partie lame. Une face conique qui se trouve dans la continuité de ladite extrémité arrière desdites lames périphériques externes, et dont la trajectoire de rotation autour dudit axe central prend la forme d'un cône tronqué, est agencée à l'interface entre ladite partie lame et ladite partie queue.
PCT/JP2020/036022 2020-09-24 2020-09-24 Fraise cylindrique deux tailles Ceased WO2022064595A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021509940A JP6892037B1 (ja) 2020-09-24 2020-09-24 エンドミル
PCT/JP2020/036022 WO2022064595A1 (fr) 2020-09-24 2020-09-24 Fraise cylindrique deux tailles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/036022 WO2022064595A1 (fr) 2020-09-24 2020-09-24 Fraise cylindrique deux tailles

Publications (1)

Publication Number Publication Date
WO2022064595A1 true WO2022064595A1 (fr) 2022-03-31

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ID=76429657

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/036022 Ceased WO2022064595A1 (fr) 2020-09-24 2020-09-24 Fraise cylindrique deux tailles

Country Status (2)

Country Link
JP (1) JP6892037B1 (fr)
WO (1) WO2022064595A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002321115A (ja) * 2001-04-24 2002-11-05 Mmc Kobelco Tool Kk エンドミルおよびその製造方法
JP2005319538A (ja) * 2004-05-10 2005-11-17 Nachi Fujikoshi Corp ボールエンドミル
JP2007015025A (ja) * 2005-07-05 2007-01-25 Mitsubishi Materials Kobe Tools Corp テーパネックエンドミル
JP2007030074A (ja) * 2005-07-25 2007-02-08 Mitsubishi Materials Kobe Tools Corp ラジアスエンドミル及び切削加工方法
WO2009107595A1 (fr) * 2008-02-29 2009-09-03 マニー株式会社 Outil de coupe dentaire
JP2013519416A (ja) * 2010-02-11 2013-05-30 サイブロン・カナダ・エルピー バーおよびバーを製作する方法
JP2016112634A (ja) * 2014-12-12 2016-06-23 株式会社 東陽 切削工具及びこの切削工具を備えた切削装置
WO2016199935A1 (fr) * 2015-06-12 2016-12-15 三菱マテリアル株式会社 Mèche d'extrémité effilée et tête de coupe
US9604291B2 (en) * 2013-09-24 2017-03-28 United Technologies Corporation Ball-end milling cutter tool
WO2017131173A1 (fr) * 2016-01-27 2017-08-03 京セラ株式会社 Fraise en bout et procédé de production d'article coupé

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002321115A (ja) * 2001-04-24 2002-11-05 Mmc Kobelco Tool Kk エンドミルおよびその製造方法
JP2005319538A (ja) * 2004-05-10 2005-11-17 Nachi Fujikoshi Corp ボールエンドミル
JP2007015025A (ja) * 2005-07-05 2007-01-25 Mitsubishi Materials Kobe Tools Corp テーパネックエンドミル
JP2007030074A (ja) * 2005-07-25 2007-02-08 Mitsubishi Materials Kobe Tools Corp ラジアスエンドミル及び切削加工方法
WO2009107595A1 (fr) * 2008-02-29 2009-09-03 マニー株式会社 Outil de coupe dentaire
JP2013519416A (ja) * 2010-02-11 2013-05-30 サイブロン・カナダ・エルピー バーおよびバーを製作する方法
US9604291B2 (en) * 2013-09-24 2017-03-28 United Technologies Corporation Ball-end milling cutter tool
JP2016112634A (ja) * 2014-12-12 2016-06-23 株式会社 東陽 切削工具及びこの切削工具を備えた切削装置
WO2016199935A1 (fr) * 2015-06-12 2016-12-15 三菱マテリアル株式会社 Mèche d'extrémité effilée et tête de coupe
WO2017131173A1 (fr) * 2016-01-27 2017-08-03 京セラ株式会社 Fraise en bout et procédé de production d'article coupé

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JPWO2022064595A1 (fr) 2022-03-31
JP6892037B1 (ja) 2021-06-18

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