WO2017126696A1 - バーリング加工方法及びバーリング加工装置 - Google Patents
バーリング加工方法及びバーリング加工装置 Download PDFInfo
- Publication number
- WO2017126696A1 WO2017126696A1 PCT/JP2017/002027 JP2017002027W WO2017126696A1 WO 2017126696 A1 WO2017126696 A1 WO 2017126696A1 JP 2017002027 W JP2017002027 W JP 2017002027W WO 2017126696 A1 WO2017126696 A1 WO 2017126696A1
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- Prior art keywords
- punch
- pad
- burring
- workpiece
- hole
- Prior art date
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- 238000003672 processing method Methods 0.000 title abstract 2
- 230000002093 peripheral effect Effects 0.000 claims abstract description 136
- 238000003825 pressing Methods 0.000 claims abstract description 17
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- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 238000004080 punching Methods 0.000 description 7
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- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
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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
- B21D28/26—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
- 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
- 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
- B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
Definitions
- the present disclosure relates to a burring method and a burring apparatus.
- a burring method for forming a cylindrical flange on a workpiece such as a material metal plate in which a pilot hole (through hole) is formed
- a workpiece such as a material metal plate in which a pilot hole (through hole) is formed
- a flange is formed.
- the tip of the flange by forming the shape of the tip of the punch into a substantially conical shape, the tip of the flange (the peripheral portion of the pilot hole) can be applied to a high-strength steel sheet having low ductility. ) Is suppressed.
- Another burring method is described in Japanese Patent Application Laid-Open No. 6-087039.
- the present disclosure is intended to provide a burring method and a burring device that can suppress the occurrence of cracks at the tip of the flange with a simple configuration in consideration of the above facts.
- the punch is positioned on one side in the plate thickness direction of the plate-like workpiece having a through-hole, and the one side in the plate thickness direction of the workpiece is In a state in which the peripheral portion of the through hole is pressed in the plate thickness direction of the workpiece by the arrangement step of arranging the workpiece and the punch and the pad so that the pad is positioned on the opposite side, And an extruding step of forming a flange by moving the punch relatively to the opposite side with respect to the workpiece and extruding a peripheral edge portion of the through hole with the punch.
- a burring apparatus is disposed on one side in the plate thickness direction of a plate-like workpiece having a through hole and is opposite to the one side in the plate thickness direction of the workpiece.
- a punch that extrudes a peripheral edge portion of the through hole in the workpiece to form a flange by being moved relative to the workpiece to the side, and the opposite side in the plate thickness direction of the workpiece
- a pad that is arranged to face the punch and presses a peripheral edge portion of the through hole in the processed member together with the punch in the process of extruding the punch with respect to the processed member.
- the burring apparatus includes a punch having a top surface that is flat at least in a peripheral portion, a holder disposed around the punch, disposed opposite to the holder, and disposed on the punch side.
- a die having an opening accommodating portion; and a pad disposed in the accommodating portion and movable in the pressing direction and having a facing surface facing the top surface of the punch.
- FIG. 1 is a cross-sectional view showing a main part of a burring apparatus used in the burring method according to the first embodiment.
- FIG. 2A is a cross-sectional view showing a first step of the burring method according to the first embodiment.
- FIG. 2B is a cross-sectional view showing the middle of the second step of the burring method.
- FIG. 2C is a cross-sectional view showing the final stage of the second step of the burring method.
- FIG. 3 is a perspective view showing a burring component subjected to burring by the burring apparatus shown in FIG.
- FIG. 4A is a cross-sectional view showing a state before burring in the burring method of the comparative example.
- FIG. 4B is a cross-sectional view showing a state after burring in the burring method of the comparative example.
- FIG. 5 is a perspective view showing a state in which a crack has occurred at the tip of the flange that has been burred by the burring method of the comparative example.
- FIG. 6 is a cross-sectional view showing the main part of the burring apparatus used in the burring method according to the second embodiment.
- FIG. 7 is a partially enlarged cross-sectional view illustrating the middle of the second step of the burring method according to the second embodiment.
- FIG. 8 is a cross-sectional view for explaining shearing of the material metal plate by the pad in the second step of the burring method according to the first embodiment.
- FIG. 9 is a cross-sectional view showing an example of a modification of the pad shown in FIG.
- FIG. 10A is a cross-sectional view for explaining an example in which an inclined portion is formed on the entire outer peripheral surface of the pad.
- FIG. 10B is a cross-sectional view for explaining an example in which an inclined portion is formed on a part of the outer peripheral surface of the pad.
- FIG. 10C is a cross-sectional view for explaining an example in which a curved inclined portion is formed on a part of the outer peripheral surface of the pad.
- FIG. 11 is a cross-sectional view showing a main part of a modification of the burring apparatus used in the burring method according to the first embodiment.
- a burring method according to the first embodiment will be described with reference to FIGS.
- a burring component 12 having a substantially cylindrical flange 14 is manufactured by burring the material metal plate 10 as the “worked member” in which the pilot hole is formed.
- the “prepared hole” refers to a through-hole penetrating the material metal plate 10 in the plate thickness direction.
- the structure of the raw metal plate 10 and the burring component 12 will be described first.
- the burring apparatus 20 used for burring will be described. After that, the burring method will be described.
- symbol is attached
- the burring component 12 will be described with reference to FIG. 3 indicates one side of the burring component 12 in the plate thickness direction, and arrow B indicates the opposite side of the burring component 12 in the plate thickness direction, that is, the burring component 12. The other side of the plate thickness direction is shown.
- the burring component 12 is made of, for example, a high strength steel plate having a tensile strength of 440 MPa or more.
- the high-strength steel plate constituting the burring component 12 has a tensile strength of 590 MPa and a plate thickness of 2.9 mm as an example.
- the burring component 12 is formed with a flange 14 protruding to the other side in the plate thickness direction by burring.
- An inner diameter D1 of the flange 14 is 60 mm as an example.
- a circular prepared hole 10 ⁇ / b> A is formed in the material metal plate 10 before burring to form a flange 14.
- the inner diameter d of the pilot hole 10A is 36 mm as an example.
- the flange 14 having a hole expansion rate ((D1-d) / d) of 0.67 is formed.
- the shape of the pilot hole 10A is not limited to a circular shape, and may be an elliptical shape, for example.
- the burring apparatus 20 will be described with reference to FIG. 1 indicates the lower side of the burring apparatus 20, and the arrow B indicates the upper side of the burring apparatus 20. And the apparatus up-down direction and the plate
- the upper side and the lower side in the figure are defined for explanation, and the vertical direction in the figure may not coincide with the vertical direction.
- the burring apparatus 20 includes a punch 22 and a holder 24 that constitute the lower part of the burring apparatus 20, and a pad 26 and a die 28 that constitute the upper part of the burring apparatus 20. .
- the material metal plate 10 is disposed between the punch 22 and the holder 24, the pad 26 and the die 28, and the material metal plate 10 is subjected to burring.
- the upper surface of the holder 24 is an installation surface on which the material metal plate 10 is installed. And when the raw material metal plate 10 is installed in the upper surface of the holder 24, the position with respect to the holder 24 of the raw material metal plate 10 is determined. As this structure, the structure which provides the pin for positioning (illustration omitted) on the upper surface of the holder 24, and forms the hole for positioning (illustration omitted) in which the said pin is inserted in the raw metal plate 10, for example is mentioned. Further, on the upper surface of the holder 24, a punch accommodating portion 24A for accommodating the punch 22 is formed at a position corresponding to the pilot hole 10A of the material metal plate 10. The punch accommodating portion 24A is formed in a concave shape opened to the upper side of the apparatus.
- the holder 24 has a punch accommodating portion 24A that is open on the upper side of the apparatus.
- the punch accommodating portion 24A is formed in a circular shape when viewed from the upper side of the apparatus.
- the holder pressurization apparatus 60 may be connected with the lower end part of the holder 24 like the modification of the burring processing apparatus 20 shown by FIG.
- the holder pressurizing device 60 is constituted by, for example, a gas cushion, a hydraulic device, a spring, an electric drive device, and the like.
- the punch 22 is formed in a substantially cylindrical shape having the vertical direction of the apparatus as an axial direction (a direction along an axis 22AL described later).
- the axis 22AL of the punch 22 is indicated by a one-dot chain line.
- the pressing direction of the burring apparatus 20 is a direction along the punch axis 22AL.
- the punch 22 is accommodated in the punch accommodating portion 24A.
- the outer diameter D3 of the punch 22 is the same as the inner diameter D1 of the flange 14 of the burring component 12. That is, in the present embodiment, the outer diameter D3 of the punch 22 is 60 mm.
- a moving device 30 as an example of a punch moving device is connected to the lower end of the punch 22.
- the moving device 30 is configured so that the punch 22 can move relative to the holder 24 in the vertical direction of the device. Specifically, the punch 22 can be moved in the axial direction by the moving device 30.
- the moving device 30 is composed of, for example, a hydraulic cylinder.
- the pilot hole 10 ⁇ / b> A of the material metal plate 10 is arranged coaxially with the punch 22.
- the said embodiment is an example and the pilot hole 10A and the punch 22 do not need to be arrange
- the top surface of the punch 22 (the surface facing the pad 26 excluding a shoulder portion 22A described later) is a punch surface 22B.
- the punch surface 22B is formed along a surface orthogonal to the vertical direction of the apparatus. During the burring process, the punch surface 22B is parallel to the lower surface (one surface in the plate thickness direction) of the material metal plate 10 installed in the holder 24.
- the punch surface 22B of the punch 22 is arranged flush with the lower surface of the material metal plate 10 by the moving device 30, the punch surface 22B comes into contact with the lower surface of the material metal plate 10 on the surface.
- a shoulder 22A having an arcuate cross section is formed at the boundary between the outer peripheral surface of the punch 22 (the outer peripheral surface of the body portion) and the top surface (punch surface 22B).
- the die 28 is disposed on the upper side of the apparatus with respect to the holder 24, and faces the holder 24 in the vertical direction of the apparatus.
- the die 28 is connected to a moving device 34 as an example of a die moving device.
- the moving device 34 is configured to be able to move the die 28 in the vertical direction of the device.
- the burring apparatus 20 is configured to hold the material metal plate 10 in the vertical direction of the apparatus by the die 28 and the holder 24 when the die 28 is moved to the lower side of the apparatus.
- a pad accommodating portion 28 ⁇ / b> A is formed as an “accommodating portion” that accommodates the pad 26 at a position corresponding to the pilot hole 10 ⁇ / b> A of the material metal plate 10.
- the pad accommodating portion 28A is formed in a concave shape opened to the lower side of the apparatus.
- the die 28 has a pad accommodating portion 28A that is open to the lower side of the apparatus.
- the pad accommodating portion 28A is formed in a circular shape when viewed from the lower side of the apparatus, and is disposed coaxially with the punch accommodating portion 24A described above.
- the inner diameter of the pad housing portion 28A is substantially the same as the outer diameter D2 (see FIG. 3) of the flange 14 of the burring component 12 after processing.
- the pad 26 is formed in a columnar shape with the vertical direction of the device as the axial direction.
- the pad 26 is accommodated in the pad accommodating portion 28A.
- the pad 26 is disposed to face the punch 22 in the thickness direction of the material metal plate 10.
- the pad 26 is disposed coaxially with the pilot hole 10 ⁇ / b> A and the punch 22 of the material metal plate 10.
- a pad pressurizing device 32 is connected to the upper end of the pad 26.
- the pad pressurizing device 32 is constituted by, for example, a gas cushion, a hydraulic device, a spring, an electric drive device, or the like. Accordingly, the pad 26 is connected to the die 28 by the pad pressurizing device 32 so as to be relatively movable in the vertical direction of the device.
- the lower surface of the pad 26 (that is, the opposing surface facing the punch surface 22B of the punch 22 in the vertical direction of the apparatus) is a pad surface 26A.
- the pad surface 26A is formed along a surface perpendicular to the vertical direction of the apparatus.
- the pad surface 26 ⁇ / b> A is parallel to the upper surface (surface on one side in the plate thickness direction) of the material metal plate 10 installed in the holder 24 and the punch surface 22 ⁇ / b> B of the punch 22.
- the pad 26 is connected (integrated) to the die 28 by the pad pressing device 32, but the pad 26, the pad pressing device 32, and the die 28 are configured separately. Also good.
- the pad accommodating portion 28A may be configured as a hole penetrating in the vertical direction of the apparatus, and the pad 26, the pad pressurizing device 32, and the die 28 may be configured separately.
- the pad 26 is movable from the back side (upper side of the device) of the pad housing portion 28A to a position at least matching the opening surface 28B of the pad housing portion 28A.
- the pad 26 is for pressing the peripheral edge portion 10B of the prepared hole 10A of the material metal plate 10.
- the inner diameter d of the pilot hole 10A is determined according to the flange height of the burring component. It is desirable that the outer diameter D5 of the pad 26 is large so that it can correspond to the inner diameter d of any pilot hole 10A. However, since the pad 26 moves in the pad accommodating portion 28A, the outer diameter D5 of the pad 26 is smaller than the inner diameter D7 of the pad accommodating portion 28A.
- the outer diameter D5 of the pad 26 is the same dimension as the outer diameter D4 of the punch surface 22B of the punch 22 (in the present embodiment, the outer diameter D5 is 50 mm as an example).
- a surface hardened layer is formed on the pad surface 26A of the pad 26 by performing a surface treatment such as quenching, nitriding treatment, surface reinforcing coating or the like. This is because the pad surface 26A is rubbed against the edge of the pilot hole 10A of the material metal plate 10 to be damaged.
- the burring apparatus 20 further includes a control device 36 that controls the moving device 30 and the moving device 34.
- the control device 36 uses at least one of the moving device 30 and the moving device 34 to press the peripheral edge portion 10B of the pilot hole 10A in the raw metal plate 10 in the thickness direction of the raw metal plate 10 by the punch 22 and the pad 26.
- the pad 26 is moved by the pad pressurizing device 32 to a position coinciding with the opening surface 28B of the pad housing portion 28A.
- the control device 36 moves the punch 22 relative to the other side in the plate thickness direction with respect to the material metal plate 10 in the pressurized state as shown in FIG.
- At least one of the moving device 30 and the moving device 34 is controlled such that the peripheral edge portion 10B is extruded to form the flange 14 (see FIG. 2C).
- the burring apparatus 20 may include all of the moving device 30, the moving device 34, and the holder pressurizing device 60 so that all the processes (A) to (C) can be performed.
- the holder 24 is fixed, and the die 28 is lowered by the moving device 34 to restrain the material metal plate 10.
- the punch 22 is raised by the moving device 30 and burring is performed.
- the die 28 is fixed, and a holder pressing device 60 (see FIG. 11) is connected to the holder 24.
- the holder pressing device 60 raises the holder 24 and restrains the material metal plate 10.
- the punch 22 is raised by the moving device 30 and burring is performed.
- a holder pressing device 60 (see FIG. 11) is connected below the holder 24, the die 28 is lowered by the moving device 34, and the holder 24 is pressed upward by the holder pressing device 60.
- the material metal plate 10 is restrained by the die 28.
- the punch 22 is fixed, the die 28 is lowered by the moving device 34, the holder 24 is pushed by the die 28, and the raw metal plate 10 restrained by the die 28 and the holder 24 is lowered and burring is performed.
- the pad 26 is moved to the lower side of the apparatus by the pad pressurizing apparatus 32, so that the peripheral edge 10 ⁇ / b> B of the prepared hole 10 ⁇ / b> A in the material metal plate 10 is moved to the pad 26 (pad surface 26 ⁇ / b> A) and punch 22 ( The surface 22B) is configured to apply pressure in the vertical direction of the apparatus (in the thickness direction of the material metal plate 10).
- the pad surface 26A of the pad 26 is in close contact with the upper surface of the peripheral edge portion 10B of the pilot hole 10A in the raw metal plate 10
- the punch surface 22B of the punch 22 is the peripheral portion of the pilot hole 10A in the raw metal plate 10
- substantially the entire peripheral edge 10 ⁇ / b> B of the pilot hole 10 ⁇ / b> A in the material metal plate 10 is pressed by the pad 26 and the punch 22.
- At least the end portion 10 ⁇ / b> C on the side of the pilot hole 10 ⁇ / b> A in the peripheral edge portion 10 ⁇ / b> B of the pilot hole 10 ⁇ / b> A in the material metal plate 10 is configured to be pressed by the pad 26 and the punch 22.
- the pressure applied to the material metal plate 10 by the pad 26 and the punch 22 is appropriately set according to the thickness, material, etc. of the material metal plate 10. That is, in the second step of the burring method described later, the end portion 10C of the peripheral edge portion 10B of the pilot hole 10A of the raw metal plate 10 moves relative to the pad 26 and the punch 22 while sliding, and finally the burring processing.
- the pressure is appropriately set so that the flange 14 is formed on the component 12.
- the burring method has a first step as an example of an “arrangement step” and a second step as an example of an “extrusion step” shown below.
- the punch 22 is positioned on one side of the material metal plate 10 in the plate thickness direction, and is opposite to the one side of the material metal plate 10 in the plate thickness direction ( The material metal plate 10 is arranged so that the pad 26 is located on the other side.
- the punch surface 22B of the punch 22 is flush with the upper surface of the holder 24, or the punch surface 22B of the punch 22 is lower than the upper surface of the holder 24.
- the material metal plate 10 in which the pilot hole 10 ⁇ / b> A is formed is installed (set) on the holder 24.
- the material metal plate 10 is installed (set) on the holder 24 in a state where the center of the pilot hole 10 ⁇ / b> A of the material metal plate 10 is arranged coaxially with the punch 22.
- the die 28 is moved to the lower side of the apparatus, or the holder 24 is raised, and the material metal plate 10 is held between the die 28 and the holder 24. That is, a portion of the raw metal plate 10 other than the peripheral edge portion 10B of the pilot hole 10A is held between the die 28 and the holder 24.
- the pad 26 is moved to the lower side by the pad pressurizing device 32, and the peripheral edge portion 10B of the prepared hole 10A in the material metal plate 10 is replaced with the pad 26 (pad surface 26A) and the punch 22 (punch surface). 22B), pressure is applied in the vertical direction of the apparatus (in the thickness direction of the material metal plate 10). That is, in the present embodiment, in the first step, the peripheral edge portion 10 ⁇ / b> B of the prepared hole 10 ⁇ / b> A in the material metal plate 10 is pressed by the pad 26 and the punch 22. In other words, the peripheral edge portion 10B of the prepared hole 10A in the material metal plate 10 is nipped and pressed by the pad 26 and the punch 22 from the initial stage of the second step described later.
- the punch surface 22B of the punch 22 When the punch surface 22B of the punch 22 is below the upper surface of the holder 24, the punch surface 22B of the punch 22 and the upper surface of the holder 24 are flush with each other, and then the pilot hole 10A in the material metal plate 10 is formed.
- the peripheral edge portion 10B is pressurized in the vertical direction of the apparatus by the pad 26 and the punch 22.
- the punch 22 is moved upward relative to the die 28 and the holder 24 by the moving device 30 against the pressure applied by the pad pressurizing device 32 from the state shown in FIG. 2A.
- the punch 22 and the pad 26 are moved to the upper side of the apparatus with respect to the die 28 and the holder 24 while maintaining the pressurization state of the peripheral hole 10B of the pilot hole 10A of the material metal plate 10 by the punch 22 and the pad 26.
- the peripheral edge portion 10B of the pilot hole 10A of the material metal plate 10 pressed by the punch 22 and the pad 26 is formed in a cylindrical shape while being pushed upward by the punch 22 (see FIG. 2B). ).
- the peripheral edge portion 10B of the pilot hole 10A of the material metal plate 10 is bent into a substantially S shape by the shoulder portion 22A of the punch 22 and the shoulder portion of the die 28 in a longitudinal sectional view. Further, as the punch 22 and the pad 26 move upward in the apparatus, the inner peripheral surface of the pilot hole 10 ⁇ / b> A moves between the punch 22 and the pad 26 to the outside in the radial direction of the punch 22. That is, the peripheral portion 10B of the pilot hole 10A is formed in a cylindrical shape while the pilot hole 10A gradually expands (while the diameter is increased).
- the end 10C of the peripheral edge 10B of the pilot hole 10A passes through between the punch 22 and the pad 26, and the punch 22 and the pad 26 with respect to the peripheral edge 10B of the pilot hole 10A of the raw metal plate 10 are obtained.
- the pressure state due to is released. If the punch 22 and the die 28 move relatively in the same manner, burring can be performed in the same manner. In the second step, the same burring process can be performed even if the punch 22 is fixed and the die 28 is lowered.
- the punch 22 is inserted into the flange 14 after the end 10C of the peripheral edge 10B of the pilot hole 10A has come out between the punch 22 and the pad 26. Is done. Further, when the end portion 10C of the peripheral edge portion 10B of the pilot hole 10A has come out between the punch 22 and the pad 26, the flange 14 is disposed on the radially outer side of the pad 26. For this reason, the pad 26 is moved to the lower side of the apparatus relative to the punch 22 by the pressure applied by the pad pressurizing apparatus 32. Thus, the flange 14 is formed on the burring component 12.
- the operation and effect of the present embodiment will be described in comparison with the burring method of the comparative example.
- the raw metal plate 10 is subjected to burring using the burring device that does not include the pad 26 and the pad pressurizing device 32 in the present embodiment.
- symbol is attached
- the punch surface 22B of the punch 22 and the upper surface of the holder 24 are flush with each other or lower than the upper surface, as in the present embodiment.
- the material metal plate 10 in which the pilot hole 10 ⁇ / b> A is formed is installed (set) on the holder 24. Further, the die 28 is moved to the lower side of the apparatus, or the holder 24 is raised, and the material metal plate 10 is held between the die 28 and the holder 24.
- the punch 22 is moved relative to the die 28 and the holder 24 by the moving device 30 to the upper side of the device.
- the moving device 34 moves the die 28 and the holder 24 to the lower side of the device.
- the peripheral edge portion 10 ⁇ / b> B of the pilot hole 10 ⁇ / b> A of the material metal plate 10 is pushed upward by the punch 22, and the flange 14 is formed on the material metal plate 10.
- the peripheral edge portion 10B of the pilot hole 10A formed in the raw metal plate 10 is extruded by the punch 22 to form the cylindrical flange 14, so that the tip end portion of the flange 14 after forming (hereinafter referred to as appropriate) (Referred to as “tip portion 14 ⁇ / b> A”) is extended in the circumferential direction of the flange 14. That is, the molding of the flange 14 by the punch 22 is a so-called stretch flange molding (forming the flange in a stretched state).
- the material metal plate 10 is a high-strength steel plate having a tensile strength of 440 MPa or more (590 MPa in the present embodiment), and the ductility of the material metal plate 10 is relatively low. For this reason, as shown in FIG. 5, when a burring process of a comparative example with a hole expansion ratio of 0.67 is performed on a high-strength steel sheet having a tensile strength of 590 MPa and a plate thickness of 2.9 mm. A crack (see a part in FIG. 5) occurs at the tip 14A of the flange 14 after molding.
- the peripheral portion 10B of the pilot hole 10A in the material metal plate 10 is formed in the thickness direction of the material metal plate 10 by the punch 22 and the pad 26.
- the flange 14 is formed while being pressed. It is known that the ductility of a material becomes high under hydrostatic pressure that applies a compressive force from around the material. For this reason, by compressing the peripheral portion 10B of the pilot hole 10A in the material metal plate 10, the ductility in the peripheral portion 10B of the pilot hole 10A when the flange 14 is formed can be increased.
- the peripheral edge portion 10B of the pilot hole 10A in the material metal plate 10 is pressed in the thickness direction of the material metal plate 10 by the punch 22 and the pad 26.
- the peripheral part 10B of 10 A of pilot holes can be made into pseudo hydrostatic pressure.
- the flange 14 can be formed in the state which made ductility of the peripheral part 10B of the pilot hole 10A in the raw material metal plate 10 high.
- under hydrostatic pressure means a state in which a uniform pressure is applied to the material from the periphery of the material by the water pressure when the material is submerged. If the compression force is applied to the material from the surroundings under atmospheric pressure, it is referred to as “under hydrostatic pressure”.
- the flange 14 is formed. For this reason, the flange 14 can be formed in a state where the ductility of the end portion 10C of the peripheral edge portion 10B of the prepared hole 10A in the raw metal plate 10 is increased, and the tip portion 14A of the formed flange 14 is cracked. Further suppression can be achieved.
- burring with a hole expansion ratio of 0.67 is performed on a high strength steel plate having a tensile strength of 590 MPa and a plate thickness of 2.9 mm.
- a high strength steel plate having a tensile strength of 590 MPa and a plate thickness of 2.9 mm it was confirmed that no crack occurred in the tip portion 14A of the flange 14 after molding.
- the peripheral edge portion 10B of the pilot hole 10A in the material metal plate 10 is pressed in the thickness direction of the material metal plate 10 by the punch 22 and the pad 26 from the initial stage of the second step. .
- the flange 14 can be molded in a state where the ductility of the peripheral edge portion 10 ⁇ / b> B of the prepared hole 10 ⁇ / b> A in the raw metal plate 10 is increased from the initial stage of forming the flange 14 with the punch 22. Thereby, the crack in 14 A of front-end
- the peripheral edge portion 10B of the prepared hole 10A in the material metal plate 10 with the punch 22 and the pad 26, it is possible to suppress cracking at the tip portion 14A of the flange 14.
- the crack in the front end portion 14A of the flange 14 can be suppressed without making the shape of the punch 22 corresponding to the pilot hole 10A in the material metal plate 10 as in the burring method described in the background art. Therefore, the suppression of cracks at the tip portion 14A of the flange 14 can be realized with a highly versatile device configuration.
- the burring method according to the second embodiment will be described with reference to FIGS.
- the raw metal plate 10 is subjected to burring using an apparatus different from the burring apparatus 20 of the first embodiment.
- the burring apparatus 50 according to the second embodiment will be described, and then the burring method according to the second embodiment will be described.
- the burring apparatus 50 is configured in the same manner as the burring apparatus 20 of the first embodiment except for the following points.
- portions of the burring apparatus 50 that are configured similarly to the burring apparatus 20 are denoted by the same reference numerals.
- a substantially disc-shaped spacer 52 (also referred to as a shim) is provided on the punch surface 22B of the punch 22, and the spacer 52 is fixed to the punch 22.
- the spacer 52 is arranged coaxially with the punch 22, and the outer diameter D 6 of the spacer 52 is smaller than the inner diameter d of the pilot hole 10 A of the material metal plate 10.
- the plate thickness t of the spacer 52 is a predetermined plate thickness that is smaller than the plate thickness of the material metal plate 10 (in the present embodiment, the plate thickness t of the spacer 52 is the plate thickness (2. About 66% (1.9 mm) of 9 mm). That is, in a state where the raw metal plate 10 is installed in the burring apparatus 50, the spacer 52 does not protrude upward from the upper surface of the raw metal plate 10. Further, the thickness t of the spacer 52 is smaller than the radial clearance C between the punch 22 and the die 28.
- the predetermined plate thickness of the spacer 52 is determined based on the plate thickness of the flange 14 after the plate thickness is reduced by calculating the plate thickness reduction of the flange 14 from the hole expansion rate of the flange 14 in burring by simulation or the like.
- the Specifically, the thickness t of the spacer 52 is set to be slightly thinner than the thickness of the flange 14 after the thickness reduction. That is, although details will be described later, when the plate thickness t of the spacer 52 is larger than the plate thickness of the flange 14 after the plate thickness is reduced, the pad 26 is formed later in the second step of the burring method described later. And the pressurization force with respect to the raw material metal plate 10 by the punch 22 falls.
- the thickness t of the spacer 52 is set to be slightly thinner than the thickness of the flange 14 after the thickness reduction.
- the burring method according to the second embodiment includes a first step as an example of an “arrangement step” and a second step as an example of an “extrusion step”. is doing.
- the punch 22 is positioned on one side of the raw metal plate 10 in the plate thickness direction, and is opposite to the one side of the raw metal plate 10 in the plate thickness direction (the other side).
- the material metal plate 10 is disposed so that the pad 26 is positioned on the surface. Further, the punch surface 22 B of the punch 22 and the upper surface of the holder 24 are flush with each other, or the punch surface 22 B is lower than the upper surface of the holder 24. In this state, the material metal plate 10 in which the pilot hole 10 ⁇ / b> A is formed is installed (set) on the holder 24.
- the material metal plate 10 is installed (set) on the holder 24 in a state where the pilot hole 10 ⁇ / b> A of the material metal plate 10 is disposed coaxially with the punch 22.
- the spacer 52 is disposed inside the pilot hole 10 ⁇ / b> A of the material metal plate 10, and the spacer 52 does not protrude above the apparatus from the upper surface of the material metal plate 10.
- the die 28 is moved to the lower side of the apparatus, or the holder 24 is raised, and the material metal plate 10 is held between the die 28 and the holder 24.
- a portion other than the peripheral edge portion 10 ⁇ / b> B of the prepared hole 10 ⁇ / b> A in the material metal plate 10 is held between the die 28 and the holder 24.
- the holder 24 may be raised and the material metal plate 10 may be sandwiched between the die 28 and the holder 24.
- the pad pressing device 32 moves the pad 26 to the lower side of the device, and presses the peripheral portion 10B of the lower hole 10A in the material metal plate 10 downward. If the punch 22 does not contact the lower side of the material metal plate 10, the punch 22 is raised until it contacts the material metal plate 10. At this time, since the spacer 52 does not protrude upward from the upper surface of the material metal plate 10, a gap is formed between the upper surface of the spacer 52 and the pad surface 26 ⁇ / b> A of the pad 26. For this reason, the peripheral edge portion 10B of the pilot hole 10A in the raw metal plate 10 is pressed in the vertical direction of the apparatus (in the thickness direction of the raw metal plate 10) by the pad 26 and the punch 22.
- the peripheral edge portion 10B of the prepared hole 10A in the material metal plate 10 is pressed by the pad 26 and the punch 22.
- the peripheral edge portion 10B of the pilot hole 10A in the material metal plate 10 is pressed by the pad 26 and the punch 22 from the initial stage of the second step described later.
- the punch 22 is moved to the upper side of the die 28 and the holder 24 by the moving device 30 against the pressure applied by the pad pressurizing device 32 from the state shown in FIG.
- the die 28 is lowered by the moving device 34 in a state where the raw metal plate 10 is held between the die 28 and the holder 24.
- the punch 22 and the pad 26 are moved to the upper side of the apparatus with respect to the die 28 and the holder 24 while maintaining the pressurization state of the peripheral hole 10B of the pilot hole 10A of the material metal plate 10 by the punch 22 and the pad 26.
- the peripheral edge portion 10B of the pilot hole 10A of the material metal plate 10 pressed by the punch 22 and the pad 26 is formed in a cylindrical shape while being pushed upward by the punch 22 (see FIG. 7).
- the edge part 10C of the peripheral part 10B of 10 A of pilot holes slips out between the punch 22 and the pad 26, and the peripheral edge of 10 A of pilot holes of the raw metal plate 10 is carried out.
- the pressure state by the punch 22 and the pad 26 on the portion 10B is released.
- the punch 22 is inserted into the flange 14 after the peripheral edge portion 10B of the pilot hole 10A has come out between the punch 22 and the pad 26.
- the flange 14 is disposed on the outer side in the radial direction of the pad 26.
- the pad 26 is moved downward relative to the punch 22 by the pressure.
- the flange 14 is formed on the material metal plate 10 while pressing the peripheral edge portion 10B of the pilot hole 10A in the material metal plate 10 with the punch 22 and the pad 26.
- tip parts of the flange 14 can be suppressed similarly to 1st Embodiment.
- the spacer 52 is fixed to the punch surface 22 B of the punch 22, and the spacer 52 is interposed between the punch 22 and the pad 26. Thereby, it is possible to suppress the occurrence of punching residue at the tip portion 14A of the flange 14 after molding.
- this point will be described in comparison with the first embodiment.
- the spacer 52 is not provided on the punch surface 22B of the punch 22. Therefore, as shown in FIG. 8, when the end portion 10C of the peripheral edge portion 10B of the pilot hole 10A comes out between the punch 22 and the pad 26 at the end of the second step, the pad 26 is a pad pressurizing device. 32 moves to the lower side of the apparatus relative to the punch 22. When the pad 26 moves to the lower side of the apparatus, the outer peripheral edge of the pad surface 26A of the pad 26 acts so as to shear substantially the entire inner peripheral surface of the prepared hole 10A of the material metal plate 10 (FIG. 8). See part b).
- the inner peripheral surface of the pilot hole 10 ⁇ / b> A of the material metal plate 10 is sheared, so that a thread-like punched residue (shear residue) is generated at the distal end portion 14 ⁇ / b> A of the formed flange 14 or the distal end surface of the flange 14. Shear marks may remain.
- the punch 22 or the pad 26 may be caught by the punched residue.
- a spacer 52 is provided on the punch surface 22B of the punch 22. Then, at the end of the second step, when the end portion 10C of the peripheral edge portion 10B of the pilot hole 10A comes out between the punch 22 and the pad 26, the pad 26 is punched by the pad pressurizing device 32 by the pad pressure device 32 as described above. Relative to the lower side of the device. However, since the spacer 52 is provided between the punch 22 and the pad 26 in the second embodiment, the relative movement amount of the pad 26 with respect to the punch 22 is smaller than that in the first embodiment. .
- the outer peripheral edge of the pad surface 26 ⁇ / b> A of the pad 26 can be prevented from shearing the entire inner peripheral surface of the prepared hole 10 ⁇ / b> A of the material metal plate 10.
- punching residue shear residue
- the flange 14 is stretched and flange-formed, so that the plate thickness of the flange 14 is smaller than the plate thickness of the raw metal plate 10 before forming.
- the thickness t of the spacer 52 is larger than the thickness of the flange 14 after the thickness reduction, the end portion 10C of the peripheral edge portion 10B of the pilot hole 10A has a gap between the punch 22 and the pad 26.
- the pad surface 26A of the pad 26 comes into contact with the upper surface of the spacer 52, and the pressure applied to the material metal plate 10 by the pad 26 and the punch 22 decreases.
- the plate thickness of the spacer 52 is set to 2.5 mm and 2.0 mm, which are larger than the predetermined plate thickness, a crack occurs in the distal end portion 14A of the flange 14. Accordingly, considering the plate thickness of the flange 14 after the plate thickness is reduced, the plate thickness of the spacer 52 is appropriately set to a predetermined plate thickness, thereby suppressing cracking at the tip portion 14A of the flange 14 and removing the scrap. Can be suppressed.
- the outer diameter D5 of the pad 26 is the same as the outer diameter D3 of the punch 22. Therefore, as shown in FIG. 7, in the second step, the timing at which the end portion 10C of the peripheral edge portion 10B of the pilot hole 10A exits between the punch 22 and the pad 26 can be delayed. For this reason, the material metal plate 10 can be pressurized by the pad 26 and the punch 22 until the formation of the flange 14 by the punch 22 is completed. Thereby, the crack in 14 A of front-end
- the outer diameter D5 of the pad 26 is set to be equal to or larger than the outer diameter D3 of the punch 22, it is possible to suppress the occurrence of the above-described punching residue. That is, by setting the outer diameter D5 of the pad 26 to be equal to or larger than the outer diameter D3 of the punch 22, the end portion 10C of the peripheral portion 10B of the pilot hole 10A is formed at the end of the flange 14 by the punch 22 and the pad 22 The time of exiting the space between the two is almost the same. For this reason, when the pad 26 moves to the lower side of the apparatus, the peripheral edge portion 10B of the prepared hole 10A of the material metal plate 10 has already been moved radially outward of the punch 22 and formed as the flange 14.
- the outer peripheral edge of the pad surface 26 ⁇ / b> A of the pad 26 is suppressed from shearing the inner peripheral surface of the prepared hole 10 ⁇ / b> A of the material metal plate 10. Therefore, it is possible to further suppress the generation of punching residue.
- the thickness t of the spacer 52 is smaller than the radial clearance C between the punch 22 and the die 28, but the thickness t may be equal to or greater than the clearance C.
- the flange can be squeezed simultaneously with the burring process.
- FIG. 9 shows an example in which the present modification is applied to the burring apparatus 20 of the first embodiment. Moreover, in FIG. 9, the same code
- an inclined surface 26A1 is formed on the radially outer portion (outer peripheral portion) of the pad surface 26A of the pad 26. The inclined surface 26A1 is inclined to the upper side of the apparatus (in the direction away from the punch 22) as it goes outward in the radial direction of the pad surface 26A.
- the plate thickness reduction rate of the end portion 10 ⁇ / b> C of the pilot hole 10 ⁇ / b> A in the material metal plate 10 is considered to be the largest.
- the plate thickness reduction rate of the end portion 10 ⁇ / b> C of the pilot hole 10 ⁇ / b> A in the material metal plate 10 is considered to be the largest.
- the inclined surface 26A1 is formed on the pad surface 26A, and the end portion 10C of the pilot hole 10A in the material metal plate 10 is held between the inclined surface 26A1 and the punch surface 22B.
- the sandwiched state of the punch 22 and the pad 26 with respect to the end 10C of the pilot hole 10A in the raw metal plate 10 can be maintained. Thereby, generation
- the spacer 52 is fixed to the punch surface 22B of the punch 22.
- the peripheral edge portion 10B of the pilot hole 10A in the material metal plate 10 is pressurized by the punch 22 and the pad 26 from the initial stage of the second step. That is, from the viewpoint of increasing the ductility of the material metal plate 10 when forming the flange 14, it is desirable to apply pressure to the material metal plate 10 from the beginning of the second step, but the material metal plate 10 by the punch 22 and the pad 26 is used.
- the start timing of pressurization may be delayed. That is, in the middle of the second step, the peripheral edge portion 10B of the prepared hole 10A in the material metal plate 10 may be pressurized by the punch 22 and the pad 26.
- a gap may be provided between the pad surface 26A of the pad 26 and the material metal plate 10.
- the punch 22 moves to the upper side of the apparatus, so that the peripheral edge portion 10B of the pilot hole 10A is pushed out together with the punch 22 to the upper side of the apparatus. Abutted. Thereby, the peripheral part 10B of the pilot hole 10A in the raw metal plate 10 is pressurized by the punch 22 and the pad 26 from the middle of the second step.
- the punch 22 and the pad 26 prepare the pilot hole. You may comprise so that the peripheral part 10B of 10A may be pressurized.
- the outer diameter D5 of the pad 26 is the same as the outer diameter D4 of the punch surface 22B. Instead, the outer diameter D5 of the pad 26 may be not less than the outer diameter D4 of the punch surface 22B and not more than the outer diameter D3 of the punch 22. Furthermore, in the second embodiment, the outer diameter D5 of the pad 26 is the same as the outer diameter D3 of the punch 22. Instead, also in the second embodiment, the outer diameter D5 of the pad 26 may be not less than the outer diameter D4 of the punch surface 22B and not more than the outer diameter D3 of the punch 22. In other words, the outer diameter D5 of the pad 26 may be changed as appropriate to the extent that no scrap is generated at the tip 14A of the flange 14.
- the outer diameter D5 of the pad 26 is preferably not less than the outer diameter D4 of the punch surface 22B and not more than the outer diameter D3 of the punch 22.
- the outer diameter D5 of the pad 26 needs to be equal to or larger than the outer diameter D4 of the punch surface 22B.
- the time during which the material metal plate 10 is pressed does not change between the case where the outer diameter D5 is larger than the outer diameter D4 and the case where the outer diameter D5 and the outer diameter D4 are equal.
- the burring component 12 is taken out from the burring apparatus 20 or the burring apparatus 50, it is desirable that the outer diameter D5 be equal to or smaller than the outer diameter D3 in order to avoid interference between the flange tip 14A and the pad 26.
- the outer peripheral edge of the pad surface 26A of the pad 26 is formed at a substantially right angle.
- the “reduced diameter portion that reduces the outer diameter of the pad surface 26A” May be formed on the outer peripheral edge.
- an inclined portion 26 ⁇ / b> B that is inclined linearly inward in the radial direction of the pad 26 as it goes toward the punch 22 side in the longitudinal cross-sectional view as viewed in the longitudinal sectional view. Good.
- the inclined portion 26B overlaps the shoulder portion 22A of the punch 22 in the vertical direction of the apparatus. Further, as shown in FIG.
- an inclined portion 26B that is linearly inclined inward in the radial direction of the pad 26 is formed on a part of the outer peripheral surface of the pad 26 toward the punch 22 side in a longitudinal sectional view. May be.
- an inclined portion 26B that is inclined in a curved shape inward in the radial direction of the pad 26 is formed on a part of the outer peripheral surface of the pad 26 toward the punch 22 side in a longitudinal sectional view. May be.
- the punch 22 has a flat top surface (upper surface). However, the punch 22 has at least a peripheral top surface that is flat. That's fine.
- the spacer 52 is provided on the punch surface 22B of the punch 22.
- the spacer 52 may be provided on the pad surface 26A of the pad 26.
- the spacer 52 has a substantially disc shape and is arranged on the same axis as the punch 22.
- the spacer 52 has a substantially annular plate shape and is arranged on the same axis as the punch 22. Also good.
- the entire punch 22 is formed in a cylindrical shape, but the present disclosure is not limited to this configuration.
- only the portion on the punch surface 22B side of the punch 22 may be formed in a cylindrical shape.
- the pad 26 whole is formed in the column shape, this indication is not limited to this structure.
- only the pad surface 26A side portion of the pad 26 may be formed in a cylindrical shape.
- the flange 14 is formed in a cylindrical shape on the burring component 12, but the shape of the flange 14 is not limited to this.
- the flange 14 may be formed in a rectangular cylindrical shape.
- the punch 22 is formed in a rectangular column shape.
- the flange 14 may be formed in a bottomed cylindrical shape. Specifically, a flange portion that extends from the distal end portion 14 ⁇ / b> A of the flange 14 to the radially inner side of the flange 14 may be formed. In this case, the state shown in FIG. 2B is the final stage of the second step of the burring method.
- the processing member to which the burring process is performed is not limited thereto.
- the burring method of the first embodiment and the second embodiment may be applied when burring is performed on a press-molded product after press molding.
- the press-molded product corresponds to the “member to be processed” in the present embodiment.
- the punch is located on one side in the plate thickness direction of the plate-like workpiece in which the through hole is formed, and the pad is located on the opposite side to the one side in the plate thickness direction of the workpiece.
- An arrangement step of arranging a workpiece In a state where the peripheral edge portion of the through hole in the workpiece is pressed in the plate thickness direction of the workpiece by the punch and the pad, the punch is relative to the opposite side with respect to the workpiece.
- An extruding step in which a flange is formed by extruding a peripheral edge of the through hole with the punch,
- a burring method comprising:
- the pad is formed in a cylindrical shape, 6.
- the burring method according to any one of appendices 1 to 5, wherein a reduced diameter portion is formed on the outer peripheral surface of the pad to reduce the outer diameter of the surface of the pad facing the punch.
- a plate-like workpiece having a through hole is disposed on one side in the thickness direction of the plate-like workpiece, and is relatively opposite to the workpiece to the opposite side to the one side in the thickness direction of the workpiece.
- a spacer is provided on the top surface of the punch or the surface facing the top surface of the pad, The burring apparatus according to appendix 8 or appendix 9, wherein a thickness of the spacer is thinner than a plate thickness of the workpiece.
- the top surface side portion of the punch is cylindrical, The portion of the pad facing the top surface is cylindrical.
- a punch shoulder is connected to the outer peripheral portion of the top surface of the punch, 11.
- the burring apparatus according to any one of appendices 8 to 10, wherein an outer diameter of the pad is not less than an outer diameter of the top surface and not more than an outer diameter of the punch.
- the pad is formed in a cylindrical shape, 12.
- the burring apparatus according to any one of appendices 8 to 11, wherein a reduced diameter portion for reducing an outer diameter of a surface of the pad facing the punch is formed on an outer peripheral surface of the pad.
- Appendix 14 A holder disposed around the punch; A die that is disposed to face the holder, opens on the punch side, and has a housing portion that houses the pad; At least one of a punch moving device for moving the punch and a die moving device for moving the die; A control device for controlling the at least one of the punch moving device and the die moving device; Further comprising The control device is disposed on a side opposite to the one side in the plate thickness direction of the workpiece and the punch arranged on one side in the plate thickness direction of the workpiece on which the through hole is formed. The punch is moved relatively to the opposite side with respect to the workpiece while the peripheral edge of the through hole is pressed in the plate thickness direction of the workpiece by the pad. 14.
- the burring apparatus according to any one of appendix 8 to appendix 13, wherein the at least one of the punch moving device and the die moving device is controlled so as to form a flange by extruding a peripheral edge portion of the through hole. .
- a punch having at least a flat top surface at the periphery, and a portion on the top surface side having a cylindrical shape; A holder disposed around the punch; A die disposed opposite to the holder and having a receiving portion opened on the punch side; A pad that is disposed within the housing portion and is movable in the pressing direction and has a facing surface facing the top surface of the punch;
- a burring apparatus comprising:
- the punch is movable in the axial direction
- the burring apparatus according to appendix 15, wherein the pad has a cylindrical shape, is disposed coaxially with the punch, and is movable in the axial direction that is the pressing direction.
- Appendix 20 The burring apparatus according to appendix 18 or appendix 19, wherein the spacer is disposed on an axis of the punch.
- a burring method for forming a cylindrical flange on a plate-like workpiece having a prepared hole The punch disposed on one side in the plate thickness direction of the workpiece is moved relative to the workpiece on the other side in the plate thickness direction of the workpiece to extrude the peripheral portion of the pilot hole and Having an extrusion process to form a flange; In the extruding step, the peripheral portion of the prepared hole is formed in the plate thickness direction of the workpiece by the pad disposed on the other side in the plate thickness direction of the workpiece and facing the punch, and the punch. Burring method to pressurize.
- a burring apparatus for forming a cylindrical flange on a plate-like workpiece having a prepared hole, The peripheral edge of the pilot hole in the processed member is disposed on one side in the plate thickness direction of the processed member and moved relative to the processed member toward the other side in the plate thickness direction of the processed member.
- the punch is disposed on one side in the plate thickness direction of the workpiece, and the pad is disposed on the other side in the plate thickness direction of the workpiece.
- the punch and the pad are arranged facing the plate thickness direction of the workpiece.
- the peripheral edge of the pilot hole in the workpiece is extruded by moving the punch relative to the workpiece to the other side of the workpiece thickness in the plate thickness direction.
- a flange is formed.
- the peripheral edge portion of the prepared hole in the workpiece is pressed in the plate thickness direction of the workpiece by the punch and the pad.
- the flange is formed while the peripheral edge portion of the pilot hole in the workpiece is compressed in the plate thickness direction of the workpiece. For this reason, generation
- the ductility in the said peripheral part becomes high.
- the material is referred to as “under hydrostatic pressure” if a compressive force is applied to the material from the surroundings under atmospheric pressure without immersing the material.
- a columnar punch comprising a flat top surface and a punch shoulder connected to the outer periphery of the top surface; A holder disposed on the outer peripheral side of the punch; A die disposed opposite to the punch and the holder and having a receiving portion opened to the punch side; A pad provided in the accommodating portion so as to be movable in a direction facing the punch, and having a facing surface disposed to face the top surface of the punch; A burring machine equipped with
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Punching Or Piercing (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
Description
以下、図1~図5を用いて、第1の実施の形態に係るバーリング加工方法について説明する。バーリング加工方法では、下穴が形成された「被加工部材」としての素材金属板10にバーリング加工を施すことで、略円筒状のフランジ14を有するバーリング加工部品12を製造する。なお、ここでいう「下穴」とは、素材金属板10を板厚方向に貫通する貫通孔を指す。以下、始めに、素材金属板10及びバーリング加工部品12の構成について説明する。次いでバーリング加工に用いられるバーリング加工装置20について説明する。そして、その後に、バーリング加工方法について説明する。なお、図面において同一の部材などには同一の符号を付しており、以下の説明において同一部材について先に説明したものは、適宜説明を省略している。
図3を用いてバーリング加工部品12について説明する。なお、図3に示される矢印Aは、バーリング加工部品12の板厚方向の一方側を示し、矢印Bはバーリング加工部品12の板厚方向の一方側とは反対側、すなわち、バーリング加工部品12の板厚方向の他方側を示している。
図1を用いて、バーリング加工装置20について説明する。なお、図1に示される矢印Aは、バーリング加工装置20の装置下側を示しており、矢印Bは、バーリング加工装置20の装置上側を示している。そして、装置上下方向と素材金属板10の板厚方向とが一致している。なお、図中の上側、下側は説明のため定義したものであり、図中の上下方向は鉛直方向と一致しなくても構わない。
また、パンチ22は、パンチ収容部24A内に収容されている。パンチ22の外径D3は、バーリング加工部品12のフランジ14の内径D1と同じ寸法である。すなわち、本実施の形態では、パンチ22の外径D3が60mmである。また、パンチ22の下端部には、パンチ移動装置の一例としての移動装置30が連結されている。この移動装置30によってパンチ22がホルダ24に対して装置上下方向に相対移動可能に構成されている。具体的には、移動装置30によってパンチ22が軸方向に移動可能とされている。この移動装置30は、例えば、油圧式のシリンダなどで構成されている。
ここで、素材金属板10をホルダ24に設置した状態では、素材金属板10の下穴10Aがパンチ22と同軸上に配置される。
なお、上記実施の形態は一例であり、下穴10Aとパンチ22とが同軸上に配置されなくてもよい。但し、下穴10Aの周縁部10Bを均一にバーリング加工するためには、下穴10Aの重心とパンチ22の軸とを重ねることが望ましい。
また、パッド26は、パッド面26Aがパッド収容部28Aの奥側(装置上側)から少なくともパッド収容部28Aの開口面28Bに一致する位置まで移動可能とされている。
(A)ホルダ24が固定され、ダイ28が移動装置34により下降して、素材金属板10を拘束する。パンチ22が移動装置30により上昇してバーリング加工する。
(B)ダイ28は固定され、ホルダ24の下にホルダ加圧装置60(図11参照)が連結され、ホルダ加圧装置60によってホルダ24が上昇して素材金属板10を拘束する。パンチ22が移動装置30により上昇してバーリング加工する。
(C)ホルダ24の下にホルダ加圧装置60(図11参照)が連結され、ダイ28が移動装置34により下降して、ホルダ加圧装置60によって上方に向けて加圧されたホルダ24とダイ28とで素材金属板10を拘束する。パンチ22は固定され、ダイ28が移動装置34により下降し、ホルダ24はダイ28に押されて、ダイ28とホルダ24により拘束された素材金属板10が下降してバーリング加工する。
次に、第1の実施の形態におけるバーリング加工方法について説明する。バーリング加工方法は、以下に示す「配置工程」の一例としての第1工程と、「押出工程」の一例としての第2工程と、を有している。
このとき、パンチ22のパンチ面22Bとホルダ24の上面とが面一、あるいはパンチ22のパンチ面22Bがホルダ24の上面より下になる。この状態において、下穴10Aの形成された素材金属板10をホルダ24上に設置(セット)する。具体的には、素材金属板10の下穴10Aの中心がパンチ22と同軸上に配置された状態に、素材金属板10をホルダ24上に設置(セット)する。
パンチ22とダイ28とが相対的に同じように移動すれば、同じようにバーリング加工できる。第2工程では、パンチ22を固定し、ダイ28を下降させても同様のバーリング加工ができる。
以下、図6~図8を用いて第2の実施の形態のバーリング加工方法について説明する。なお、第2の実施の形態では、第1の実施の形態のバーリング加工装置20とは異なる装置を用いて素材金属板10にバーリング加工を施している。以下、第2の実施の形態のバーリング加工装置50について説明し、次いで、第2の実施の形態のバーリング加工方法について説明する。
図6に示されるように、バーリング加工装置50は、以下に示す点を除いて第1の実施の形態のバーリング加工装置20と同様に構成されている。なお、以下の説明では、バーリング加工装置50において、バーリング加工装置20と同様に構成されている部分については、同一の符号を付している。
また、パンチ22のパンチ面22Bとホルダ24の上面とが面一、あるいはパンチ面22Bがホルダ24の上面より下になる。この状態において、下穴10Aの形成された素材金属板10をホルダ24上に設置(セット)する。具体的には、素材金属板10の下穴10Aがパンチ22と同軸上に配置された状態に、素材金属板10をホルダ24上に設置(セット)する。また、このときには、素材金属板10の下穴10Aの内側にスペーサ52が配置されると共に、スペーサ52が素材金属板10の上面よりも装置上側に突出されない。
次に、図9を用いて、パッド26の変形例について説明する。図9では、第1の実施の形態のバーリング加工装置20に本変形例を適用した例として図示している。また、図9では、第1の実施の形態と同様に構成されている部分については、同一の符号を付している。本変形例では、パッド26のパッド面26Aにおける径方向外側部分(外周側の部分)に傾斜面26A1が形成されている。この傾斜面26A1は、パッド面26Aの径方向外側へ向かうに従い装置上側(パンチ22から離間する方向)へ傾斜している。そして、パンチ22とパッド26とで素材金属板10を狭持した状態では、素材金属板10の下穴10Aの周縁部10Bの端部10Cが傾斜面26A1に当接する。これにより、第1工程から第2工程の終期まで、素材金属板10における下穴10Aの端部10Cに対するパンチ22とパッド26との狭持状態を維持することができる。
本明細書に記載された全ての文献、特許出願、および技術規格は、個々の文献、特許出願、および技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。
貫通孔が形成された板状の被加工部材の板厚方向の一方側にパンチが位置し、前記被加工部材の板厚方向の前記一方側とは反対側にパッドが位置するように、前記被加工部材を配置する配置工程と、
前記パンチと前記パッドとによって前記被加工部材における前記貫通孔の周縁部を前記被加工部材の板厚方向に加圧した状態で、前記パンチを前記被加工部材に対して前記反対側へ相対的に移動させて前記パンチにより前記貫通孔の周縁部を押出してフランジを形成する押出工程と、
を備えるバーリング加工方法。
前記押出工程の初期から前記パンチ及び前記パッドによって前記貫通孔の周縁部を前記被加工部材の板厚方向に加圧する付記1に記載のバーリング加工方法。
前記押出工程では、前記貫通孔の周縁部の少なくとも端部を前記被加工部材の板厚方向に加圧した状態で、前記パンチを前記被加工部材に対して前記反対側へ相対的に移動させる、付記1又は付記2に記載のバーリング加工方法。
前記パンチの頂面又はパッドにおける前記パンチとの対向面には、前記押出工程において前記貫通孔の内側に位置するスペーサが設けられており、前記スペーサの厚みが前記被加工部材の板厚より薄い、付記1~付記3の何れか1項に記載のバーリング加工方法。
前記パンチ及び前記パッドは円柱状に形成され、
前記パンチの頂面の外周部には、パンチ肩部が接続されており、
前記パッドの外径が、前記頂面の外径以上で且つ前記パンチの外径以下である、付記1~付記4の何れか1項に記載のバーリング加工方法。
前記パッドは円柱状に形成されており、
前記パッドの外周面には、前記パッドにおける前記パンチとの対向面の外径を縮径させる縮径部が形成されている付記1~付記5の何れか1項に記載のバーリング加工方法。
前記縮径部が、前記パンチ側へ向かうにしたがい前記パッドの径方向内側へ傾斜された傾斜部とされている付記6に記載のバーリング加工方法。
貫通孔が形成された板状の被加工部材の板厚方向の一方側に配置され、前記被加工部材の板厚方向の前記一方側とは反対側へ前記被加工部材に対して相対的に移動されることで前記被加工部材における前記貫通孔の周縁部を押出してフランジを形成するパンチと、
前記被加工部材の板厚方向の前記反対側で且つ前記パンチと対向して配置され、前記被加工部材に対する前記パンチの押出過程において前記パンチと共に前記被加工部材における前記貫通孔の周縁部を加圧するパッドと、
を備えたバーリング加工装置。
前記貫通孔の周縁部の少なくとも端部を前記パンチと前記パッドとによって加圧する、付記8に記載のバーリング加工装置。
前記パンチの頂面又は前記パッドにおける前記頂面との対向面には、スペーサが設けられており、
前記スペーサの厚みが前記被加工部材の板厚より薄い、付記8又は付記9に記載のバーリング加工装置。
前記パンチの頂面側の部分が円柱状であり、
前記パッドの前記頂面との対向面側の部分が円柱状であり、
前記パンチの頂面の外周部には、パンチ肩部が接続されており、
前記パッドの外径が、前記頂面の外径以上で且つ前記パンチの外径以下である付記8~付記10の何れか1項に記載のバーリング加工装置。
前記パッドは円柱状に形成されており、
前記パッドの外周面には、前記パッドにおける前記パンチとの対向面の外径を縮径させる縮径部が形成されている付記8~付記11の何れか1項に記載のバーリング加工装置。
前記縮径部は、前記パンチ側へ向かうにしたがい前記パッドの径方向内側へ傾斜された傾斜部とされている付記12に記載のバーリング加工装置。
前記パンチの周囲に配置されたホルダと、
前記ホルダに対向して配置され、前記パンチ側に開口し、前記パッドを収容する収容部を有するダイと、
前記パンチを移動するパンチ移動装置及び前記ダイを移動するダイ移動装置の少なくとも一方と、
前記パンチ移動装置及び前記ダイ移動装置の前記少なくとも一方を制御する制御装置と、
をさらに備え、
前記制御装置は、前記貫通孔が形成された前記被加工部材の板厚方向の一方側に配置された前記パンチと、前記被加工部材の板厚方向の前記一方側とは反対側に配置された前記パッドとにより、前記貫通孔の周縁部を前記被加工部材の板厚方向に加圧した状態で、前記パンチを前記被加工部材に対して前記反対側に相対的に移動させて前記パンチにより前記貫通孔の周縁部を押出してフランジを形成するように、前記パンチ移動装置及び前記ダイ移動装置の前記少なくとも一方を制御する、付記8~付記13の何れか1項に記載のバーリング加工装置。
少なくとも周辺部が平坦な頂面を有し、前記頂面側の部分が円柱状であるパンチと、
前記パンチの周囲に配置されたホルダと、
前記ホルダに対向して配置され、前記パンチ側に開口した収容部を有するダイと、
前記収容部内に配置され、プレス方向に移動可能であり、前記パンチの頂面に対向する対向面を有するパッドと、
を備えるバーリング加工装置。
前記パンチは、軸方向に移動可能とされ、
前記パッドは、円柱状であり、前記パンチと同軸に配置され、前記プレス方向である前記軸方向に移動可能である、付記15に記載のバーリング加工装置。
前記パッドは、少なくとも前記対向面が前記ダイの前記収容部の開口面に一致する位置まで移動可能である、付記15又は付記16に記載のバーリング加工装置。
前記頂面又は前記対向面には、スペーサが設けられている、付記15~付記17の何れか1項に記載のバーリング加工装置。
前記スペーサの厚みは、前記パンチと前記ダイの径方向のクリアランスより小さい、付記18に記載のバーリング加工装置。
前記スペーサは、前記パンチの軸上に配置される、付記18又は付記19に記載のバーリング加工装置。
前記パッドにおける前記対向面には、表面硬化層が形成されている付記15~付記20の何れか1項に記載のバーリング加工装置。
前記パンチの頂面と胴部との間の角部に面取りされたパンチ肩部を備え、前記パッドの外径は、前記頂面の外径以上かつ前記胴部の外径以下である、付記15~付記21の何れか1項に記載のバーリング加工装置。
前記パッドの前記パンチ側の胴部には、前記パンチ側に向かうにしたがい外径が小さくなる傾斜部が設けられている、付記15~付記22の何れか1項に記載のバーリング加工装置。
前記パンチ肩部と前記傾斜部とが前記プレス方向でオーバーラップしている、付記22を引用する付記23に記載のバーリング加工装置。
前記パッドの対向面の外周側には、前記対向面の外周側に向かうにしたがい前記パンチから離間する方向へ傾斜する傾斜面が形成されている、付記15~付記22の何れか1項に記載のバーリング加工装置。
下穴が形成された板状の被加工部材に筒状のフランジを形成するバーリング加工方法であって、
前記被加工部材の板厚方向一方側に配置されたパンチを前記被加工部材の板厚方向他方側へ前記被加工部材に対して相対的に移動させて前記下穴の周縁部を押出して前記フランジを形成する押出工程を有し、
前記押出工程において、前記被加工部材の板厚方向他方側で且つ前記パンチと対向して配置されたパッドと、前記パンチと、によって、前記下穴の周縁部を前記被加工部材の板厚方向に加圧するバーリング加工方法。
下穴が形成された板状の被加工部材に筒状のフランジを形成するバーリング加工装置であって、
前記被加工部材の板厚方向一方側に配置され、前記被加工部材の板厚方向他方側へ前記被加工部材に対して相対的に移動されることで前記被加工部材における前記下穴の周縁部を押出して前記フランジを形成するパンチと、
前記被加工部材の板厚方向他方側で且つ前記パンチと対向して配置され、前記被加工部材に対する前記パンチの押出過程において前記パンチと共に前記被加工部材における下穴の周縁部を加圧するパッドと、
を備えたバーリング加工装置。
ここで、押出工程において、被加工部材における下穴の周縁部が、パンチ及びパッドによって被加工部材の板厚方向に加圧される。換言すると、押出工程では、被加工部材における下穴の周縁部が、被加工部材の板厚方向に圧縮されながら、フランジが形成される。このため、フランジの先端部における割れの発生を抑制できる。すなわち、材料の周囲から圧縮力を付与する静水圧下では、材料の延性が高くなることが知られている。そして、上述のように、被加工部材における下穴の周縁部が板厚方向に圧縮されるため、パンチによるフランジの成形時において、下穴の周縁部を擬似的な静水圧下にすることができる。このため、当該周縁部を加圧しない場合と比べて、当該周縁部における延性が高くなる。これにより、フランジの成形時において、下穴の周縁部の延性を高くした状態でフランジが形成されるため、フランジの先端部に割れが発生することを抑制できる。このように、付記26に記載のバーリング加工方法又は付記27に記載のバーリング加工装置によれば、パンチの形状を被加工部材の下穴に応じた形状にすることなく、フランジの先端部における割れの発生を抑制することができる。なお、本開示のバーリング加工方法及びバーリング加工装置では、材料を浸水させずに、大気圧下で周囲から材料に圧縮力を付与する状態であれば「静水圧下」と称している。
平坦状の頂面と、前記頂面の外周部に接続されたパンチ肩部と、を含んで構成された柱状のパンチと、
前記パンチの外周側に配置されたホルダと、
前記パンチ及び前記ホルダに対向して配置され、前記パンチ側へ開放された収容部を有するダイと、
前記収容部内において前記パンチとの対向方向に移動可能に設けられ、前記パンチの前記頂面に対向して配置された対向面を有するパッドと、
を備えたバーリング加工装置。
Claims (25)
- 貫通孔が形成された板状の被加工部材の板厚方向の一方側にパンチが位置し、前記被加工部材の板厚方向の前記一方側とは反対側にパッドが位置するように、前記被加工部材を配置する配置工程と、
前記パンチと前記パッドとによって前記被加工部材における前記貫通孔の周縁部を前記被加工部材の板厚方向に加圧した状態で、前記パンチを前記被加工部材に対して前記反対側へ相対的に移動させて前記パンチにより前記貫通孔の周縁部を押出してフランジを形成する押出工程と、
を備えるバーリング加工方法。 - 前記押出工程の初期から前記パンチ及び前記パッドによって前記貫通孔の周縁部を前記被加工部材の板厚方向に加圧する請求項1に記載のバーリング加工方法。
- 前記押出工程では、前記貫通孔の周縁部の少なくとも端部を前記被加工部材の板厚方向に加圧した状態で、前記パンチを前記被加工部材に対して前記反対側へ相対的に移動させる、請求項1又は請求項2に記載のバーリング加工方法。
- 前記パンチの頂面又はパッドにおける前記パンチとの対向面には、前記押出工程において前記貫通孔の内側に位置するスペーサが設けられており、
前記スペーサの厚みが前記被加工部材の板厚より薄い、請求項1~請求項3の何れか1項に記載のバーリング加工方法。 - 前記パンチ及び前記パッドは円柱状に形成され、
前記パンチの頂面の外周部には、パンチ肩部が接続されており、
前記パッドの外径が、前記頂面の外径以上で且つ前記パンチの外径以下である、請求項1~請求項4の何れか1項に記載のバーリング加工方法。 - 前記パッドは円柱状に形成されており、
前記パッドの外周面には、前記パッドにおける前記パンチとの対向面の外径を縮径させる縮径部が形成されている請求項1~請求項5の何れか1項に記載のバーリング加工方法。 - 前記縮径部が、前記パンチ側へ向かうにしたがい前記パッドの径方向内側へ傾斜された傾斜部とされている請求項6に記載のバーリング加工方法。
- 貫通孔が形成された板状の被加工部材の板厚方向の一方側に配置され、前記被加工部材の板厚方向の前記一方側とは反対側へ前記被加工部材に対して相対的に移動されることで前記被加工部材における前記貫通孔の周縁部を押出してフランジを形成するパンチと、
前記被加工部材の板厚方向の前記反対側で且つ前記パンチと対向して配置され、前記被加工部材に対する前記パンチの押出過程において前記パンチと共に前記被加工部材における前記貫通孔の周縁部を加圧するパッドと、
を備えたバーリング加工装置。 - 前記貫通孔の周縁部の少なくとも端部を前記パンチと前記パッドとによって加圧する、請求項8に記載のバーリング加工装置。
- 前記パンチの頂面又は前記パッドにおける前記頂面との対向面には、スペーサが設けられており、
前記スペーサの厚みが前記被加工部材の板厚より薄い、請求項8又は請求項9に記載のバーリング加工装置。 - 前記パンチの頂面側の部分が円柱状であり、
前記パッドの前記頂面との対向面側の部分が円柱状であり、
前記パンチの頂面の外周部には、パンチ肩部が接続されており、
前記パッドの外径が、前記頂面の外径以上で且つ前記パンチの外径以下である請求項8~請求項10の何れか1項に記載のバーリング加工装置。 - 前記パッドは円柱状に形成されており、
前記パッドの外周面には、前記パッドにおける前記パンチとの対向面の外径を縮径させる縮径部が形成されている請求項8~請求項11の何れか1項に記載のバーリング加工装置。 - 前記縮径部は、前記パンチ側へ向かうにしたがい前記パッドの径方向内側へ傾斜された傾斜部とされている請求項12に記載のバーリング加工装置。
- 前記パンチの周囲に配置されたホルダと、
前記ホルダに対向して配置され、前記パンチ側に開口し、前記パッドを収容する収容部を有するダイと、
前記パンチを移動するパンチ移動装置及び前記ダイを移動するダイ移動装置の少なくとも一方と、
前記パンチ移動装置及び前記ダイ移動装置の前記少なくとも一方を制御する制御装置と、
をさらに備え、
前記制御装置は、前記貫通孔が形成された前記被加工部材の板厚方向の一方側に配置された前記パンチと、前記被加工部材の板厚方向の前記一方側とは反対側に配置された前記パッドとにより、前記貫通孔の周縁部を前記被加工部材の板厚方向に加圧した状態で、前記パンチを前記被加工部材に対して前記反対側に相対的に移動させて前記パンチにより前記貫通孔の周縁部を押出してフランジを形成するように、前記パンチ移動装置及び前記ダイ移動装置の前記少なくとも一方を制御する、請求項8~請求項13の何れか1項に記載のバーリング加工装置。 - 少なくとも周辺部が平坦な頂面を有し、前記頂面側の部分が円柱状であるパンチと、
前記パンチの周囲に配置されたホルダと、
前記ホルダに対向して配置され、前記パンチ側に開口した収容部を有するダイと、
前記収容部内に配置され、プレス方向に移動可能であり、前記パンチの頂面に対向する対向面を有するパッドと、
を備えるバーリング加工装置。 - 前記パンチは、軸方向に移動可能とされ、
前記パッドは、円柱状であり、前記パンチと同軸に配置され、前記プレス方向である前記軸方向に移動可能である、請求項15に記載のバーリング加工装置。 - 前記パッドは、少なくとも前記対向面が前記ダイの前記収容部の開口面に一致する位置まで移動可能である、請求項15又は請求項16に記載のバーリング加工装置。
- 前記頂面又は前記対向面には、スペーサが設けられている、請求項15~請求項17の何れか1項に記載のバーリング加工装置。
- 前記スペーサの厚みは、前記パンチと前記ダイの径方向のクリアランスより小さい、請求項18に記載のバーリング加工装置。
- 前記スペーサは、前記パンチの軸上に配置される、請求項18又は請求項19に記載のバーリング加工装置。
- 前記パッドにおける前記対向面には、表面硬化層が形成されている請求項15~請求項20の何れか1項に記載のバーリング加工装置。
- 前記パンチの頂面と胴部との間の角部に面取りされたパンチ肩部を備え、前記パッドの外径は、前記頂面の外径以上かつ前記胴部の外径以下である、請求項15~請求項21の何れか1項に記載のバーリング加工装置。
- 前記パッドの前記パンチ側の胴部には、前記パンチ側に向かうにしたがい外径が小さくなる傾斜部が設けられている、請求項15~請求項22の何れか1項に記載のバーリング加工装置。
- 前記パンチ肩部と前記傾斜部とが前記プレス方向でオーバーラップしている、請求項22を引用する請求項23に記載のバーリング加工装置。
- 前記パッドの対向面の外周側には、前記対向面の外周側に向かうにしたがい前記パンチから離間する方向へ傾斜する傾斜面が形成されている、請求項15~請求項22の何れか1項に記載のバーリング加工装置。
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