WO2020230538A1 - Outil de pliage à angle aigu pour ourlage - Google Patents

Outil de pliage à angle aigu pour ourlage Download PDF

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Publication number
WO2020230538A1
WO2020230538A1 PCT/JP2020/017070 JP2020017070W WO2020230538A1 WO 2020230538 A1 WO2020230538 A1 WO 2020230538A1 JP 2020017070 W JP2020017070 W JP 2020017070W WO 2020230538 A1 WO2020230538 A1 WO 2020230538A1
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WO
WIPO (PCT)
Prior art keywords
mold
mold portion
panel
shaped
bending
Prior art date
Application number
PCT/JP2020/017070
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English (en)
Japanese (ja)
Inventor
宏嘉 泉澤
Original Assignee
株式会社信濃製作所
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 株式会社信濃製作所 filed Critical 株式会社信濃製作所
Publication of WO2020230538A1 publication Critical patent/WO2020230538A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures

Definitions

  • the present invention relates to an acute-angle bending tool for hemming for performing an acute-angled bending on a flange-shaped edge portion provided on the panel in a flange shape when the panel is hemmed.
  • a sharp-angle bending is performed by further bending a flange-shaped edge portion formed by bending the edge of the panel into a flange shape in advance so as to form an acute angle with the back surface of the panel. Is given. After that, a part of the brim-shaped edge portion of the panel subjected to the acute angle bending is pressed by the above-mentioned pressing device and folded back to about 180 °. By performing this pressing process while changing the processing position along the length direction of the brim-shaped edge portion, hemming processing is performed over the entire brim-shaped edge portion.
  • the accuracy and quality of acute angle bending may become non-uniform, and it may be difficult to maintain the finish of hemming processing at a certain level.
  • An object of the present invention is to provide an acute-angle bending tool for hemming that can appropriately perform acute-angle bending regardless of the skill level of the installer in view of the problems of the prior art.
  • the acute-angle bending tool for hemming of the present invention Type 1 part and The second type part that cooperates with the first type part
  • the second mold portion is provided with a driving means for driving the second mold portion in the forward direction toward the first mold portion and the backward direction toward the first mold portion.
  • the first mold portion includes a plate-shaped portion having a predetermined width and extending in the retracting direction.
  • the plate-shaped part The first surface along the forward and backward directions and The second surface opposite to the first surface and A third surface that connects the first surface and the second surface and faces the backward direction is provided.
  • the second mold portion includes a protruding portion that protrudes onto the second surface when the second mold portion is driven in the forward direction.
  • the protrusion is A fourth surface having a corresponding width in the predetermined width direction and facing the forward direction, It is characterized by including a fifth surface adjacent to the fourth surface and facing the second surface at a predetermined distance when the second mold portion is driven in the forward direction.
  • the flange-shaped edge of the panel is bent at an acute angle to form the flange-shaped edge through the bent portion by bending the edge of the panel into a flange shape on the back surface side of the panel.
  • the protruding portion of the second mold portion protrudes on the second surface of the first mold portion, so that the portion in contact with the third surface of the brim-shaped edge portion is further on the fourth surface of the second mold portion. Is partially bent by being pushed and bent by the fifth surface. At this time, the bent portion forms an acute angle with the back surface of the panel according to the protruding amount of the protruding portion (driving amount of the second mold portion).
  • the brim-shaped edge By performing such partial bending over the entire brim-shaped edge while changing the position along the brim-shaped edge, the brim-shaped edge can be bent at an acute angle. At that time, since the bending amount due to each partial bending is determined by the driving amount of the second mold portion by the driving means, acute angle bending with a uniform bending amount is performed regardless of the skill level of the builder.
  • the acute angle bending tool for hemming By bending the edge of the panel toward the back surface of the panel in a flange shape, a part of the flange-shaped edge formed on the panel via the bent portion is formed at an acute angle with the back surface of the panel. Further, it is an acute-angle bending tool for hemming processing for performing acute-angle bending on the flange-shaped edge portion by performing partial bending along the flange-shaped edge portion while changing the processing position in the processing direction.
  • a first mold portion having a support portion that abuts and supports the portion of the panel to be partially bent from the back surface of the panel to the bent portion.
  • a second mold part for performing the partial bending in cooperation with the first mold part is provided with a driving means for driving the second mold portion in the forward direction toward the first mold portion and the backward direction toward the first mold portion.
  • the second mold portion presses the outside of the brim-shaped edge portion of the panel supported by the first mold portion so that the partial bending is performed. It is characterized by having a pressing surface.
  • the portion of the panel to be partially bent is supported by the first mold portion. Then, by driving the second mold portion in the forward direction by the driving means, the pressing surface of the second mold portion presses the portion of the collar-shaped edge portion to perform the above-mentioned partial bending. By performing this partial bending while changing the processing position in the processing direction along the brim-shaped edge portion, the brim-shaped edge portion is bent at an acute angle.
  • the bending amount of the brim-shaped edge portion (acute angle formed with the back surface of the panel) in each partial bending is determined according to the driving amount in the forward direction of the second mold portion. It can be done properly regardless of the degree.
  • the first mold portion includes a U-shaped portion having a U-shaped cross section perpendicular to the machining direction that extends in the retracting direction.
  • the U-shaped portion includes a first portion which is one portion extending in the retracting direction and a second portion which is the other portion extending in the retracting direction.
  • the first portion constitutes the support portion and constitutes the support portion.
  • the surface of the second portion facing the first portion constitutes a guide surface on the side of the first mold portion that guides the first mold portion and the second mold portion to each other in the forward direction and the backward direction.
  • the cross section perpendicular to the processing direction has a shape that allows the second mold portion to penetrate inside the U-shaped portion when driven in the forward direction. When the second mold portion invades the inside of the U-shaped portion, the surface facing the guide surface on the first mold portion side slides with the guide surface at the time of the invasion to provide mutual guidance. It constitutes a guide surface on the side of the second mold.
  • the guide surface on the side of the first mold portion and the guide surface on the side of the second mold portion guide the first mold portion and the second mold portion to each other in the guide direction without shifting.
  • the bending amount of the brim-shaped edge in each partial bending can be more reliably made constant.
  • the driving means A fixed portion in which the first mold portion is fixed and the second mold portion is movably supported in the forward direction and the backward direction.
  • a first link member whose one end is rotatably connected to the fixed portion around the first rotation shaft. It includes a second link member having one end rotatably connected to the first link member and the other end rotatably connected to the fixing portion.
  • the fixing portion, the first link member, the second link member, and the second mold portion form a link mechanism similar to the crank slider mechanism having four links and one degree of freedom. , Can be easily designed for proper partial bending.
  • the driving means A lever portion that can rotate around the first rotation shaft together with the first link member and rotates the first link member. It is preferable to provide an adjusting means for adjusting the positional relationship between the first link member and the lever portion in the rotational direction.
  • the drive amount of the second mold portion according to the rotation amount of the lever portion can be appropriately set. Can be done.
  • first link member and the lever portion are connected to each other with a play in the rotation direction about the first rotation shaft at a place other than the first rotation shaft. Is preferable.
  • FIG. 1 When the 2nd mold part is driven in the forward direction. It is a bottom view corresponding to FIG. 2 when the second mold part is driven in the forward direction. It is a perspective view which shows the panel which was made acute angle bending by the acute angle bending tool for hemming processing of FIG. It is a perspective view which shows the state that the panel of FIG.
  • the acute-angle bending tool 1 for hemming has a partial bending that bends a part of a flange-shaped flange-shaped edge portion 3 provided on the panel 2. This is for sharply bending the flange-shaped edge portion 3 by changing the machining position in the machining direction M along the flange-shaped edge portion 3. The partial bending is performed by further bending a part of the flange-shaped edge portion 3 at the bent portion 4 so as to form an acute angle with the back surface of the panel 2.
  • the flange-shaped edge portion 3 is a portion previously formed on the panel 2 via the bent portion 4 by bending the edge portion of the panel 2 toward the back surface side of the panel 2 in a flange shape.
  • the bent portion 4 is a portion actually bent at that time.
  • the acute-angled bending tool 1 for hemming processing includes a first mold portion 5 and a second mold portion 6 for performing the partial bending in cooperation with the first mold portion 5.
  • the second mold portion 6 is provided with a driving means 7 for driving the second mold portion 6 in the forward direction F approaching the first mold portion 5 and the backward direction B moving away from the first mold portion 5.
  • the first mold portion 5 has a support portion 8 that abuts and supports the portion of the panel 2 to be partially bent from the back surface of the panel 2 to the bent portion 4.
  • the second mold portion 6 presses the outside of the flange-shaped edge portion 3 of the panel 2 supported by the first mold portion 5 so that the partial bending is performed.
  • a pressing surface 9 is provided.
  • the portion of the brim-shaped edge portion 3 to which partial bending is performed is smoothly formed on the portion. It is chamfered so that it is partially bent.
  • the first mold portion 5 includes a U-shaped portion 10 having a U-shaped cross section perpendicular to the machining direction M that opens and extends in the receding direction B.
  • the U-shaped portion 10 includes a first portion 11 which is one portion extending in the receding direction B and a second portion 12 which is the other portion extending in the receding direction B.
  • the first portion 11 constitutes the above-mentioned support portion 8.
  • the surface of the second portion 12 facing the first portion 11 is a guide surface 13 on the side of the first mold portion 5 that mutually guides the first mold portion 5 and the second mold portion 6 in the forward direction F and the backward direction B.
  • the second mold portion 6 has a shape in which the cross section perpendicular to the machining direction M can penetrate inside the U-shaped portion 10 when the second mold portion 6 is driven in the forward direction F.
  • the second mold portion 6 invades the inside of the U-shaped portion 10, the surface facing the guide surface 13 on the first mold portion 5 side slides with the guide surface 13 at the time of the invasion to guide each other.
  • the guide surface 14 on the side of the second mold portion 6 to be provided is formed.
  • the drive means 7 includes a fixing portion 15 to which the first mold portion 5 is fixed, and a first link member 17 having one end rotatably connected to the fixing portion 15 around the first rotation shaft 16.
  • a second link member 18 having one end rotatably connected to the first link member 17 and the other end rotatably connected to the fixing portion 15 is provided.
  • the fixing portion 15 freely supports the second mold portion 6 in the forward direction F and the backward direction B.
  • the fixing portion 15 includes a handle portion 19, a cylinder portion 20 fixed to the tip of the handle portion 19, and a piston portion 21 supported by the cylinder portion 20 so as to be able to advance and retreat in the forward direction F and the backward direction B.
  • a compression coil spring 22 that urges the piston portion 21 toward the handle portion 19 with respect to the cylinder portion 20 is interposed between the cylinder portion 20 and the piston portion 21.
  • the piston portion 21 has a cylindrical internal space.
  • the mounting portion 23 of the second mold portion 6 is inserted into the internal space with a certain amount of play with the inner wall of the internal space, and the play is allowed by the bolts 24 constituting the first rotation shaft 16. It is attached so that it can make a slight rotation within the range.
  • the first link member 17 has a shape symmetrical with respect to a symmetrical surface 25 perpendicular to the machining direction M and parallel to the forward direction F and the backward direction B.
  • One side and the other side of the first link member 17 with the symmetrical surface 25 interposed therebetween are connected via a connecting portion 26 provided at an end portion of the first link member 17 opposite to the first rotating shaft 16. Will be done.
  • the one side and the other side are rotatably connected to the piston portion 21 and the second mold portion 6 by bolts 24 so as to sandwich the piston portion 21 from both sides.
  • the fixing portion 15, the first link member 17, the second link member 18, and the second mold portion 6 form a link mechanism similar to the crank slider mechanism having 4 links and 1 degree of freedom.
  • the drive means 7 can rotate around the first rotation shaft 16 together with the first link member 17, and has a lever portion 27 for rotating the first link member 17, a first link member 17, and a lever.
  • An adjusting means 28 for adjusting the positional relationship with the portion 27 in the rotation direction is provided.
  • the lever portion 27 has a shape symmetrical with respect to the plane of symmetry 25.
  • first link member 17 and the lever portion 27 are rotated with each other having a play in the rotation direction about the first rotation shaft 16 at a position other than the first rotation shaft 16. It is done by restraining in the direction of movement.
  • This play-related restraint is one of the pin-shaped member 29 passed between one side and the other side of the first link member 17 sandwiching the symmetrical surface 25 and the lever portion 27 sandwiching the symmetrical surface 25. It is secured by an elongated hole 30 provided on one side and the other side and through which the pin-shaped member 29 penetrates. That is, the elongated hole 30 has a length corresponding to the play in the rotation direction about the first rotation shaft 16.
  • the fixing portion 15 includes an arch-shaped member 31 for fixing the first mold portion 5 to the fixing portion 15.
  • the arch-shaped member 31 has a symmetrical shape with the symmetrical surface 25 in between, and extends from the base end side to the tip end side along the symmetrical surface 25.
  • the base end portion of the arch-shaped member 31 is fixed to the outer surface of the cylinder portion 20.
  • the first mold portion 5 is fixed to the tip portion of the arch-shaped member 31.
  • the second link member 18 is composed of two plate-shaped members.
  • the connection of the second link member 18 to the first link member 17 and the fixing portion 15 is carried out by means of bolts 32a and 32b penetrating the intermediate portion of the first link member 17 and the base end portion of the arched member 31, respectively. This is done by connecting two plate-shaped members to the intermediate portion and the base end portion. At the time of this connection, the two plate-shaped members are provided on both sides of the intermediate portion and the proximal end portion so as to sandwich the intermediate portion and the proximal end portion.
  • the adjusting means 28 includes a screw hole 33 provided in the connecting portion 26 of the first link member 17, and an adjusting screw 35 screwed into the screw hole 33 through the through hole 34 provided in the lever connecting portion 27a. ..
  • An adjustment knob 36 is provided at the end of the adjustment screw 35 on the side opposite to the screw hole 33.
  • a compression coil spring 37 is provided between the knob 36 of the adjusting screw 35 and the connecting portion 26.
  • a compression coil spring 38 is provided between the lever connecting portion 27a and the connecting portion 26 of the first link member 17.
  • the adjusting screw 35 is attached to the base end portion of the arch-shaped member 31 in the second mold portion 6. It is driven in the forward direction F until it abuts.
  • the adjusting means 28 by turning the knob 36 to reduce the amount of protrusion of the adjusting screw 35 from the screw hole 33, the rotation direction of the first link member 17 and the lever portion 27 The positional relationship can be adjusted so that the second mold portion 6 can be driven to the position closest to the first mold portion 5. Further, by increasing the amount of protrusion of the adjusting screw 35 from the screw hole 33, it is possible to adjust so that the second mold portion 6 can be driven to the position farthest from the first mold portion 5.
  • the first mold portion 5 includes a plate-shaped portion 41 having a predetermined width W and extending in the receding direction B. ..
  • the plate-shaped portion 41 retreats by connecting the first surface 42 along the forward direction F and the retreat direction B, the second surface 43 opposite to the first surface 42, and the first surface 42 and the second surface 43. It is provided with a third surface 44 facing the direction B.
  • the plate-shaped portion 41 corresponds to the above-mentioned first portion 11.
  • the second mold portion 6 includes a protruding portion 45 that protrudes on the second surface 43 of the plate-shaped portion 41 when the second mold portion 6 is driven in the forward direction F.
  • the protruding portion 45 has a width corresponding to the predetermined width W described above and is adjacent to the fourth surface 46 facing the forward direction F and the fourth surface 46, and the second mold portion 6 is in the forward direction F. It includes a second surface 43 and a fifth surface 47 facing each other with a predetermined distance when driven.
  • the fourth surface 46 and the fifth surface 47 form the above-mentioned pressing surface 9.
  • the first mold portion 5 when performing an acute angle bending on the brim-shaped edge portion 3 of the panel 2, the first mold portion 5 first supports the portion of the panel 2 to be partially bent. Then, by grasping and tightening the lever portion 27 and the handle portion 19 with one hand, the second mold portion 6 is driven in the forward direction F via the driving means 7. As a result, the pressing surface 9 of the second mold portion 6 presses the portion of the flange-shaped edge portion 3, and the portion is further bent at the bent portion 4 so that the portion forms an acute angle with the back surface of the panel 2. Perform partial bending. The situation at this time is shown in FIGS. 4 and 5. The bending amount in this partial bending can be adjusted by operating the knob 36 of the adjusting screw 35.
  • the brim-shaped edge portion 3 can be bent at an acute angle. At this time, it is preferable to repeat the acute-angled bending while increasing the bending amount of the partial bending in several steps by the knob 36.
  • acute angle bending is performed by partial bending in which the acute angle formed by the brim-shaped edge portion 3 and the back surface of the panel 2 is a large angle.
  • the acute-angled bending at the desired angle can be achieved with high quality. This facilitates the subsequent pressing process for joining the collar-shaped edge portion 3 to the back surface of the panel 2.
  • the acute angle bending is performed by sandwiching another panel 40 to be joined to the panel 2 between the panel 2 and the first portion 11 of the first mold portion 5, so that the curvature at the bent portion 4 is joined.
  • the pressing device 39 as shown in FIG. 7 is used for the panel 2 in which the acute angle formed by the back surface of the panel 2 and the brim-shaped edge portion 3 is set to ⁇ by the acute angle bending described above.
  • the hemming process can be completed (see JP-A-2018-061981).
  • an adhesive is arranged on the back surface of the panel 2 and between the brim-shaped edge 3 and the other panel 40.
  • the tip of the third surface 44 (see FIG. 9) of the first mold portion 5 has an R shape, and is shown in FIG. 8 by performing pressing processing using the pressing device 39 after pre-folding (sharp bending). As shown, it is possible to finish the tip shape of the panel 2 after the hemming process into a spherical shape (R shape).
  • the bending amount of the flange-shaped edge portion 3 in each partial bending is determined according to the driving amount of the second mold portion 6 in the forward direction F set by the adjusting means 28. Therefore, sharp bending can be appropriately performed regardless of the skill level of the builder.
  • the guide surface 13 on the side of the first mold portion 5 and the guide surface 14 on the side of the second mold portion 6 guide the first mold portion 5 and the second mold portion 6 without shifting in the guide direction.
  • the bending amount of the brim-shaped edge portion 3 in each partial bending can be more reliably made constant.
  • the fixing portion 15, the first link member 17, the second link member 18, and the second mold portion 6 form a link mechanism similar to the crank slider mechanism having 4 links and 1 degree of freedom, the driving means 7 Can be easily designed for proper partial bending.
  • the drive amount of the second mold portion 6 according to the rotation amount of the lever portion 27 is appropriately set. can do.
  • first link member 17 and the lever portion 27 are connected with a play in the rotation direction, the manufacturing error of each portion is absorbed and the second mold portion 6 is connected to the first mold portion 5. On the other hand, it can be driven in the forward direction F and the backward direction B without any trouble. Further, even in this case, since the guide surfaces 13 and 14 described above are provided, the accuracy of partial bending and acute angle bending can be maintained high.
  • the present invention is not limited to this, and can be appropriately modified and implemented.
  • the lever portion 27 and the handle portion 19 may be oriented in a direction perpendicular to the plane of symmetry 25 so that these gripping operations can be performed in a posture more suitable for the work.
  • a driving means suitable for the orientation of the lever portion 27 and the handle portion 19 may be further adopted.
  • Symmetrical plane, 26 ... Connecting part, 27 ... Lever part, 27a ... Lever connecting part, 28 ... Adjusting means, 29 ... Pin-shaped member, 30 ... Long hole, 31 ... Arch-shaped member, 32a, 32b ... Bolt, 33 ... Screw hole, 34 ... Through hole, 35 ... Adjusting screw, 36 ... Knob, 37, 38 ... Compression coil spring, 39 ... Pressing device, 40 ... Other panel, 41 ... Plate-shaped part, 42 ... 1st surface, 43 ... 2nd surface, 44 ... 3rd surface , 45 ... Projection, 46 ... 4th surface, 47 ... 5th surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

La présente invention concerne un outil de pliage à angle aigu 1 pour ourlage qui effectue un pliage section par section. Une partie d'un bord relevé 3 formé dans une tôle 2 par une pliure 4 est pliée de façon à former un angle aigu avec le côté envers de la tôle 2, tout en décalant la position de traitement le long du bord relevé 3, ce qui permet d'effectuer un pliage à angle aigu sur le bord relevé 3. L'outil est pourvu d'une première matrice 5 ayant une section de support 8 qui supporte la tôle 2 sur le côté envers vers le haut le long de la pliure 4, et un moyen d'entraînement pour entraîner une seconde matrice 6 suivant un sens avant F et un sens arrière B par rapport à la première matrice 5. La seconde matrice est pourvue d'une face de pression qui presse, lorsque la matrice est entraînée dans le sens avant F, le côté externe de la partie du bord relevé 3 de la tôle 2 supportée sur la première matrice 5, ce par quoi un pliage section par section est réalisé.
PCT/JP2020/017070 2019-05-14 2020-04-20 Outil de pliage à angle aigu pour ourlage WO2020230538A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-091112 2019-05-14
JP2019091112A JP2020185587A (ja) 2019-05-14 2019-05-14 ヘミング加工用鋭角曲げ具

Publications (1)

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WO2020230538A1 true WO2020230538A1 (fr) 2020-11-19

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Application Number Title Priority Date Filing Date
PCT/JP2020/017070 WO2020230538A1 (fr) 2019-05-14 2020-04-20 Outil de pliage à angle aigu pour ourlage

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JP (1) JP2020185587A (fr)
TW (1) TW202045274A (fr)
WO (1) WO2020230538A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55177938U (fr) * 1979-05-31 1980-12-20
JPS574323A (en) * 1980-06-06 1982-01-09 Kaneyoshi Kotani Method and apparatus for bending metallic plate
JPH03230821A (ja) * 1990-02-02 1991-10-14 Toyota Motor Corp ヘミング用プレス型
JPH11309527A (ja) * 1998-04-23 1999-11-09 Daihatsu Motor Co Ltd ヘミング装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55177938U (fr) * 1979-05-31 1980-12-20
JPS574323A (en) * 1980-06-06 1982-01-09 Kaneyoshi Kotani Method and apparatus for bending metallic plate
JPH03230821A (ja) * 1990-02-02 1991-10-14 Toyota Motor Corp ヘミング用プレス型
JPH11309527A (ja) * 1998-04-23 1999-11-09 Daihatsu Motor Co Ltd ヘミング装置

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Publication number Publication date
JP2020185587A (ja) 2020-11-19
TW202045274A (zh) 2020-12-16

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