WO2022054360A1 - 金属板の打ち抜き装置 - Google Patents
金属板の打ち抜き装置 Download PDFInfo
- Publication number
- WO2022054360A1 WO2022054360A1 PCT/JP2021/022870 JP2021022870W WO2022054360A1 WO 2022054360 A1 WO2022054360 A1 WO 2022054360A1 JP 2021022870 W JP2021022870 W JP 2021022870W WO 2022054360 A1 WO2022054360 A1 WO 2022054360A1
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- WIPO (PCT)
- Prior art keywords
- punching
- metal plate
- punched
- gear
- punch
- Prior art date
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- 238000004080 punching Methods 0.000 title claims abstract description 123
- 239000002184 metal Substances 0.000 title claims abstract description 77
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000004744 fabric Substances 0.000 claims description 21
- 230000002093 peripheral effect Effects 0.000 claims description 21
- 238000005498 polishing Methods 0.000 description 25
- 238000009661 fatigue test Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 230000002265 prevention Effects 0.000 description 7
- 238000005452 bending Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
- B21D28/346—Perforating tools; Die holders length adjustable perforating tools
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
-
- 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
- B21D19/005—Edge deburring or smoothing
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/14—Particular arrangements for handling and holding in place complete dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
-
- 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
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/0641—Grinders for cutting-off for grinding holes
-
- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/06—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally
- B24B5/08—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally involving a vertical tool spindle
-
- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
-
- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/363—Single-purpose machines or devices for grinding surfaces of revolution in situ
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/24—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by rack-and-pinion means
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
Definitions
- the present invention relates to a punching device for a metal sheet, and in particular, punches a metal plate that forms a punched hole with improved fatigue strength of the sheared edge. Regarding the device (punching machine).
- the sheared end face of the punched hole of the punched metal plate is machined with a drill or the like because tensile residual stress in the circumferential direction of the punched hole is generated by the punching process and the end face is rough. It is known that the fatigue strength is lower than that of the end face of the (machining) hole (see Non-Patent Document 1), which causes fatigue fracture in automobile parts and the like. Therefore, it is desired to improve the properties of the sheared end face of the punched hole of the punched metal plate to improve the fatigue strength.
- Patent Document 1 and Patent Document 2 propose a method in which a metal plate is plastically deformed to form an indentation and then punched out. Further, in Patent Document 3, a large-size part having a larger diameter than the shearing portion is provided on the base-end side of the shearing part on the tip end side of the punch. A method has been proposed in which the sheared end face of the punched hole is rubbed by moving the sheared portion from the state where the sheared portion penetrates the punched hole of the metal plate in the punching direction and passing the majority of the mold. Further, in Patent Document 4, a metal plate with a wrinkle presser die is linked to the movement of the punch die by combining a punch die (die) and a wrinkle presser die (blank holder). A method of punching while pressurizing is proposed.
- Patent Document 1 and Patent Document 2 since another die is required in addition to the die (tool) for forming a punched hole in the metal plate, the number of steps is increased and the productivity is increased. There was the problem of being low. Further, the method disclosed in Patent Document 3 has a problem that the metal plate around the punched hole is deformed when most of the mold passes through the punched hole.
- the present invention has been made in view of the above problems, and an object thereof is to improve the properties of the sheared end face in one step without requiring another die other than the die for forming the punched hole. It is an object of the present invention to provide a punching device for a metal plate capable of forming a punched hole, suppressing the generation of cracks from a sheared end face, and improving fatigue strength.
- the metal plate punching device has a die that has a circular opening and supports the metal plate, and a punch that forms a circular punching hole in the metal plate supported by the die. ), And the punch is a punching portion between the main body portion, a columnar punching portion provided at the tip, and the punching portion between the main body portion and the punching portion.
- a rotating portion rotatably arranged with the central axis as a rotating axis, an abrasive cloth and paper provided on the outer peripheral surface of the rotating portion to polish the sheared end face of the punched hole, and the main body portion.
- a spring that accumulates as elastic energy and expands after the elastic energy is released after punching the metal plate, and the rotation of the punched portion due to the expansion of the spring. It is equipped with a rotary motion conversion mechanism (rotational motion conversion device) that converts the rotary motion of the part.
- the rotational motion conversion mechanism includes a plate-shaped rack (rack) provided so as to extend from the tip of the main body in the punching direction, a first spur gear portion that meshes with the plate-shaped rack, and the first spur gear.
- a first gear having a first bevel gear portion coaxially provided with one spur gear portion and rotatably arranged around an axis orthogonal to the punching direction, and the first umbrella. It has a second bevel gear that meshes with the gear and a second spur gear that is provided coaxially with the second bevel gear, and is rotatably arranged around an axis parallel to the punching direction.
- a second gear a gear support portion provided in the punched portion to rotatably support the first gear and the second gear, and a second flat portion provided on the inner peripheral surface side of the rotating portion. It may be provided with a cylindrical rack that meshes with the gear portion.
- the unevenness of the sheared end face is reduced by forming the punched hole and polishing the sheared end face of the punched hole, and the direction of the polishing mark on the sheared end face and the punched hole are formed. It is possible to prevent the direction of cracks generated on the sheared end face from matching when a load is repeatedly applied to the metal plate, and it does not require a power source other than punching the metal plate, and it can be done in one step. It is possible to form a punched hole in the sheared end face having excellent fatigue strength. Further, according to the present invention, the formability is improved by preventing ductile fracture of the sheared end face when press forming is performed after punching, and the metal plate having punched holes is formed.
- the delayed fracture characteristics in which fracture occurs in a brittleness manner when a predetermined time elapses under a static load, can be expected to be improved. Furthermore, by reducing the unevenness of the sheared end face to reduce the surface area, it is expected that the coating properties and corrosion resistance of the paint will be improved.
- FIG. 1 is a cross-sectional view illustrating a metal plate punching device according to an embodiment of the present invention and its operation ((a) before punching, (b) spring contraction, (c) immediately after punching and polishing).
- FIG. 2 is a perspective view showing an example of a specific configuration of a rotational motion conversion mechanism of a metal plate punching device according to an embodiment of the present invention.
- FIG. 3 is a cross-sectional view illustrating a punch of a metal plate punching device according to an embodiment of the present invention and its operation (No. 1) ((a) before punching, (b) contraction of a spring).
- FIG. 4 is a cross-sectional view illustrating a punch of a metal plate punching device according to an embodiment of the present invention and its operation (No.
- FIG. 5 is a diagram showing a fatigue test piece (fatigue specimen) used in the fatigue test in the examples.
- FIG. 6 is a cross-sectional view illustrating a sheared end face of a punched hole formed in a metal plate by punching.
- the inventor of the present invention first diligently examined the properties and fatigue strength of the sheared end face of the punched hole.
- FIG. 6A shows a cross-sectional view (side surface) of the punched hole 3 formed by punching the metal plate 1.
- the sheared end surface 5 of the punched hole 3 is divided into a sheared surface 5a and a fracture surface 5b.
- cracks 7 are likely to occur in the fracture surface 5b of the sheared end face 5, as shown in the top view of FIG. 6B. Starting from 7, fatigue fracture is reached.
- the starting point is the portion where the recesses are connected in the punching direction by the punch, and the tensile stress in the circumferential direction of the punched hole (tensile stress) added by the punching process and the stress such as bending of the metal plate are applied.
- the crack 7 grows as a result. Further, it has been clarified that even if the direction of the polishing marks remaining on the sheared end surface 5 is the punching direction, the generation of cracks 7 is promoted.
- the inventor uses a punch having a columnar punched portion, a rotating portion that can rotate around the central axis of the punched portion as a rotation axis, and a polishing cloth paper provided on the outer peripheral surface of the rotating portion.
- a punch having a columnar punched portion, a rotating portion that can rotate around the central axis of the punched portion as a rotation axis, and a polishing cloth paper provided on the outer peripheral surface of the rotating portion.
- a spring is provided between the main body of the punch and the punched portion at the tip, a part of the punching load is stored as the elastic energy of the spring, and after punching, the elastic energy stored in the spring is released.
- the metal plate punching device 11 (hereinafter referred to as “punching device 11”) according to the embodiment of the present invention uses a die 13 and a punch 15 as an example in FIG. It forms a punched hole 3.
- the die 13 has a circular opening 13a and supports the metal plate 1.
- the punch 15 has a main body portion 17, a columnar punching portion 19 provided at the tip in the punching direction, a rotating portion 21, a polishing pad paper 23, a spring 25, and a rotational motion conversion mechanism 27.
- the rotating portion 21 is rotatably arranged between the main body portion 17 and the punching portion 19 with the central axis of the punching portion 19 as a rotation axis.
- the polishing pad paper 23 is provided on the outer peripheral surface of the rotating portion 21 and polishes the sheared end surface 5 of the punched hole 3 by the rotation of the rotating portion 21.
- the spring 25 is arranged between the main body portion 17 and the punching portion 19 so as to be contractible and expandable in the punching direction. Then, in the process of punching the metal plate 1 by moving the punch 15 in the punching direction, the spring 25 contracts until the punching portion 19 comes into contact with the metal plate 1 and punches out, and a part of the punching load is elastic energy. After punching out the metal plate 1, the elastic energy stored in the spring 25 is released and the spring 25 expands.
- the punching direction is a direction in which the punch 15 is relatively moved toward the die 13 in order to form the punching hole 3 in the metal plate 1.
- the rotary motion conversion mechanism 27 converts the linear motion of the punching section 19 in the punching direction due to the extension of the spring 25 into the rotary motion of the rotary section 21.
- FIGS. 2 to 4 show an example of a specific configuration of the rotational motion conversion mechanism 27.
- the rotational motion conversion mechanism 27 includes a plate-shaped rack 29, a first gear 31, a second gear 33, and a gear support portion 35.
- the plate-shaped rack 29 is provided so as to extend from the tip of the main body 17 in the punching direction, and moves together with the main body 17 when the punch 15 is moved in the punching direction.
- the first gear 31 has a first spur gear portion 31a that meshes with the plate-shaped rack 29 and a first captive gear portion 31b provided coaxially with the rotation shaft of the first spur gear portion 31a. And, and are rotatably arranged around an axis orthogonal to the punching direction (around axis C in FIG. 2).
- the first spur gear portion 31a and the first bevel gear portion 31b are connected by a first gear shaft portion 31c so that they can rotate coaxially.
- the second gear 33 is a second spur gear provided coaxially with a second bevel gear portion 33a that meshes with the first bevel gear portion 31b and a rotation shaft of the second bevel gear portion 33a. It has a portion 33b and is rotatably arranged around an axis parallel to the punching direction (around axis C 2 in FIG. 2).
- the second bevel gear portion 33a and the second spur gear portion 33b are connected by a second gear shaft portion 33c so that they can rotate coaxially.
- the gear support portion 35 is provided in the punched portion 19 to rotatably support the first gear 31 and the second gear 33, respectively.
- the cylindrical rack 37 is provided on the inner peripheral surface side of the rotating portion 21 and meshes with the second spur gear portion 33b. As shown in FIG. 2, the cylindrical rack 37 is the same as the rotating portion 21, and the abrasive cloth 23 is directly attached to the outer peripheral surface of the cylindrical rack 37. However, the cylindrical rack 37 is not limited to the same as the rotating portion 21, and may be, for example, separately provided on the inner peripheral surface side of the rotating portion 21.
- the metal plate 1 is placed so as to straddle the opening 13a of the die 13, both ends of the metal plate 1 are supported, and the punch 15 is installed above the metal plate 1 (FIGS. 1A and 3). (A)).
- the plate-shaped rack 29 moves relatively in the direction opposite to the punching direction with the linear motion of the punched portion 19, and the first spur gear portion 31a meshing with the plate-shaped rack 29.
- the first gear 31 rotates via the above. Then, the rotation of the first gear 31 is transmitted to the second bevel gear portion 33a that meshes with the first bevel gear portion 31b, and the second gear 33 rotates.
- the metal plate punching device 11 As described above, according to the metal plate punching device 11 according to the embodiment of the present invention, a part of the punching load of the metal plate 1 by the punch 15 is stored in the spring 25 as elastic energy, and the metal plate 1 is punched out into a punched hole. After forming 3, the rotating portion 21 rotates by releasing the elastic energy stored in the spring 25. Then, the abrasive cloth 23 provided on the outer peripheral surface of the rotating portion 21 polishes the sheared end surface 5 of the punched hole 3, so that the rotating portion 21 can be formed without requiring a power source other than the power source for punching the metal plate 1. It can be rotated and the sheared end face 5 is polished in one step to form a punched hole 3 with reduced unevenness.
- the direction of the polishing mark on the sheared end surface 5 polished by the polishing pad paper 23 and the direction of the crack generated on the sheared end surface 5 when the metal plate 1 having the punched hole 3 is repeatedly loaded with a load coincide with each other. You can avoid it. As a result, it is possible to suppress the occurrence of cracks in the shear end face 5 when a repeated load is applied, and to form a punched hole 3 with improved fatigue strength.
- the formability is improved by preventing ductile fracture of the sheared end surface 5 when press molding is performed after punching, and the delayed fracture characteristics of the punched hole 3. It can be expected that the coatability and corrosion resistance of the paint can be improved by improving the above, reducing the unevenness of the sheared end face 5 and reducing the surface area.
- the metal plate 1 can be punched out in a state where the punched portion 19 is in contact with the metal plate 1 and contracted.
- the polishing pad paper 23 is not limited to the one provided so as to cover the entire outer peripheral surface of the rotating portion 21, but may be provided on a part of the outer peripheral surface of the rotating portion 21.
- the polishing paddy paper 23 provided on the outer peripheral surface of the rotating portion 21 is the outer peripheral surface of the punched portion 19. It is preferable that the outer diameter of the abrasive cloth 23 provided on the outer peripheral surface of the rotating portion 21 is set to be equal to or larger than the outer diameter of the punched portion 19 so as to spread outward.
- the rotating portion 21 provided with the abrasive cloth 23 on the outer peripheral surface is used in the punching hole 3. After the insertion, the abrasive cloth 23 spreads outward from the sheared end face 5 of the punched hole 3. As a result, even if the rotating portion 21 can be inserted into the punched hole 3, when the rotating portion 21 is rotated, the abrasive cloth 23 polishes not only the sheared end surface 5 but also the opening portion 13a of the die 13. Therefore, the life of the abrasive cloth 23 may be shortened. Therefore, it is desirable that the outer diameter of the abrasive cloth 23 provided on the outer peripheral surface of the rotating portion 21 is about the same as the inner diameter of the opening 13a of the die 13.
- the surface of the polishing pad paper 23 is parallel to the punching direction, that is, the angle ⁇ between the surface of the polishing pad paper 23 and the cross section 19a orthogonal to the central axis of the punched portion 19 (see FIG. 3A).
- the punch 15 having a value of 90 ° was used.
- the angle ⁇ between the surface of the abrasive cloth 23 and the cross section 19a orthogonal to the central axis of the punched portion 19 is not limited to 90 °.
- a punched hole 3 is formed in the metal plate 1 without providing the abrasive cloth 23 in the punch 15, and the angle ⁇ 'between the fracture surface 5b on the sheared end surface 5 and the surface 1a of the metal plate 1 (FIG. 6) is measured, and the angle ⁇ may be within a predetermined error range from the angle ⁇ 'measured by the preliminary test.
- An example is ⁇ 3 ° or less as the predetermined error range.
- the polishing padding paper 23 is installed so that the angle ⁇ formed by the surface of the polishing paddy paper 23 and the cross section 19a orthogonal to the central axis of the punched portion 19 is a predetermined angle, for example, the outer peripheral surface of the rotating portion 21 is installed. It is advisable to set the shape of.
- polishing pad paper 23 it is preferable to use a general buff for the polishing pad paper 23, but if the polishing pad paper 23 is not elastic in the thickness direction, it may not come out from the punched hole 3, so that the polishing pad paper 23 may not come out. It is desirable to appropriately select the types and materials of 23.
- the count (yearn count) (grain size) of the abrasive cloth 23 is not particularly limited, but it is desirable to determine it according to the hardness of the metal plate 1 and the like, and the metal plate 1 For general steel sheets, # 80 to # 240 is desirable.
- the first spur gear portion 31a meshing with the plate-shaped rack 29 rotates even when the spring 25 until the metal plate 1 is punched contracts.
- the rotating portion 21 rotates.
- the rotation of the rotating portion 21 at this time is in the opposite direction to the rotation of the rotating portion 21 after punching out the metal plate 1.
- the rotation of the rotating portion 21 until the metal plate 1 is punched does not contribute to the polishing of the sheared end surface 5 of the punched hole 3, and conversely, the life of the gear or the like of the punching device 11 may be shortened.
- the first spur gear portion 31a of the first gear 31 in the rotational motion conversion mechanism 27 is provided with a ratchet mechanism (not shown) for preventing the reverse rotation of the rotating portion 21, and the metal plate 1 is punched out. It is preferable to suppress the reverse rotation of the rotating portion 21 up to.
- the punching device 11 has, for example, a drop preventing mechanism 39 as shown in FIGS. 3 and 4.
- the fall prevention mechanism 39 is provided with a hole 41 formed in the direction opposite to the punching direction from the tip of the main body 17 and extending from the rear end of the punch 19 toward the main body 17 and inserted into the hole 41. It has a fall prevention rod 43.
- a stopper 43a is provided at the rear end of the fall prevention rod 43 to prevent the fall prevention rod 43 from coming off from the hole 41.
- the stopper 43a is at the entrance of the hole 41. It is possible to prevent the punching portion 19 from falling from the punch 15 due to being caught.
- the outer diameter of the punched portion 19 of the punching device 11 was 10 mm, and the clearance between the outer diameter of the punched portion 19 and the inner diameter of the opening 13a of the die 13 was 10%.
- a radial sander (abrasive cloth and paper) having a count of # 120 is used, and the outer diameter of the abrasive cloth 23 provided on the rotating portion 21 is 10 mm, and polishing is performed.
- the angle ⁇ between the cloth paper 23 and the cross section 19a orthogonal to the central axis of the punched portion 19 was set to 90 °.
- a fatigue test piece 51 having the punched hole 3 was produced from the metal plate 1 in which the punched hole 3 was formed by using the punching device 11. Then, a fatigue test was conducted in which a fatigue test piece 51 was repeatedly loaded with both swings using a Shenck-type plane bending tester (Shenck plane bending fatigue-testing device).
- an example of the invention was a fatigue test piece 51 having a punching hole 3 formed by using the punching device 11. Further, as a comparison target, a fatigue test piece 51 having a punched hole 3 formed by using an integrated punch having the same diameter as the punched portion 19 of the punching device 11 is produced, and the same fatigue test as described above is performed.
- Table 1 shows the results of the fatigue test.
- the fatigue test piece 51 broke after 480,000 repetitions.
- the fatigue life fatigue life was improved by 4 times or more as compared with the conventional example without being destroyed even if the number of repetitions was 2 million.
- a punched hole having improved properties of the sheared end face is formed in one step without the need for another die other than the die for forming the punched hole, and cracks from the sheared end face are formed. It is possible to provide a punching device for a metal plate capable of suppressing the occurrence and improving the fatigue strength.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Punching Or Piercing (AREA)
Abstract
Description
1a 表面
3 打ち抜き穴
5 せん断端面
5a せん断面
5b 破断面
7 き裂
11 打ち抜き装置
13 ダイ
13a 開口部
15 パンチ
17 本体部
19 打ち抜き部
19a 中心軸直交断面
21 回転部
23 研磨布紙
25 ばね
27 回転運動変換機構
29 板状ラック
31 第1歯車
31a 第1平歯車部
31b 第1傘歯車部
31c 第1歯車軸部
33 第2歯車
33a 第2傘歯車部
33b 第2平歯車部
33c 第2歯車軸部
35 歯車支持部
37 円筒状ラック
39 落下防止機構
41 孔部
43 落下防止棒
43a ストッパー
51 疲労試験片
Claims (2)
- 円形の開口部を有して金属板を支持するダイと、該ダイに支持された前記金属板に円形の打ち抜き穴を形成するパンチと、を備えた金属板の打ち抜き装置であって、
前記パンチは、
本体部と、
先端に設けられた円柱状の打ち抜き部と、
前記本体部と前記打ち抜き部との間に前記打ち抜き部の中心軸を回転軸として回転可能に配設された回転部と、
該回転部の外周面に設けられて前記打ち抜き穴のせん断端面を研磨する研磨布紙と、
前記本体部と前記打ち抜き部との間に打ち抜き方向に収縮及び伸長可能に配設され、前記打ち抜き部が前記金属板に接触して打ち抜くまでの間は収縮して打ち抜き荷重の一部を弾性エネルギーとして蓄積し、前記金属板を打ち抜いた後は前記弾性エネルギーが解放されて伸長するばねと、
該ばねの伸長による前記打ち抜き部の打ち抜き方向の直線運動を前記回転部の回転運動に変換する回転運動変換機構と、
を備える、金属板の打ち抜き装置。 - 前記回転運動変換機構は、
前記本体部の先端から打ち抜き方向に延出して設けられた板状ラックと、
前記板状ラックと噛合する第1平歯車部と、該第1平歯車部と同軸上に設けられた第1傘歯車部と、を有し、打ち抜き方向に直交する軸回りに回転可能に配設された第1歯車と、
前記第1傘歯車部と噛合する第2傘歯車部と、該第2傘歯車部と同軸上に設けられた第2平歯車部と、を有し、打ち抜き方向に平行な軸回りに回転可能に配設された第2歯車と、
前記打ち抜き部に設けられて前記第1歯車及び前記第2歯車をそれぞれ回転可能に支持する歯車支持部と、
前記回転部の内周面側に設けられ、前記第2平歯車部と噛合する円筒状ラックと、
を備える、請求項1に記載の金属板の打ち抜き装置。
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US18/022,414 US20230339008A1 (en) | 2020-09-14 | 2021-06-16 | Metal sheet punching device |
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CN114799884A (zh) * | 2022-06-24 | 2022-07-29 | 依贝伽射线防护设备科技(江苏)有限公司 | 一种冷挤压铅砖的生产设备 |
NL2034469A (en) * | 2023-03-30 | 2023-04-26 | Zhejiang Tongji Vocational College Science & Tech | Single-cylinder diesel engine body machining device |
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KR102600157B1 (ko) * | 2023-04-28 | 2023-11-07 | 이제풍 | 컷팅판 합지장치 |
CN116237761B (zh) * | 2023-05-09 | 2023-07-14 | 广州诺贝尼家居有限公司 | 一种板材加工机床 |
CN116600241B (zh) * | 2023-05-19 | 2023-12-08 | 江门市金丰贝卡音视频科技有限公司 | 一种咪芯用驻极体薄膜表金属层制备装置及工艺 |
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US20230339008A1 (en) | 2023-10-26 |
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CN116075375A (zh) | 2023-05-05 |
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