WO2015012236A1 - Metal plate with tapped hole, frame, and method for manufacturing metal plate with tapped hole - Google Patents

Metal plate with tapped hole, frame, and method for manufacturing metal plate with tapped hole Download PDF

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Publication number
WO2015012236A1
WO2015012236A1 PCT/JP2014/069244 JP2014069244W WO2015012236A1 WO 2015012236 A1 WO2015012236 A1 WO 2015012236A1 JP 2014069244 W JP2014069244 W JP 2014069244W WO 2015012236 A1 WO2015012236 A1 WO 2015012236A1
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WO
WIPO (PCT)
Prior art keywords
metal plate
wall portion
screw hole
screw
hole
Prior art date
Application number
PCT/JP2014/069244
Other languages
French (fr)
Japanese (ja)
Inventor
瀬戸 厚司
豊 三日月
幸一 ▲浜▼田
栄作 桜田
Original Assignee
新日鐵住金株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 新日鐵住金株式会社 filed Critical 新日鐵住金株式会社
Priority to MYPI2015703641A priority Critical patent/MY182951A/en
Priority to CN201480019744.6A priority patent/CN105408641B/en
Priority to KR1020157027280A priority patent/KR101811931B1/en
Priority to JP2015528277A priority patent/JP6137319B2/en
Priority to MX2015016278A priority patent/MX2015016278A/en
Publication of WO2015012236A1 publication Critical patent/WO2015012236A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/24Making other particular articles nuts or like thread-engaging members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00Flanging or other edge treatment, e.g. of tubes
    • B21D19/08Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B21D19/10Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws working inwardly
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/02Nuts or like thread-engaging members made of thin sheet material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/12Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122Threaded inserts, e.g. "rampa bolts"

Definitions

  • the present invention relates to a metal plate with a screw hole, a housing, and a manufacturing method of the metal plate with a screw hole. More specifically, a metal plate with a screw hole that has a screw hole excellent in fastening force with a male screw and can prevent the screw hole from being damaged, and a housing having the metal plate with the screw hole even when the thickness is reduced And a method of manufacturing the metal plate with screw holes.
  • the metal plates processed into various shapes by cutting and bending are often used for the outdoor units of air conditioners and the housing of substation equipment. Since a screw structure is widely used for the attachment part of this type of metal plate and other metal plates and accessory parts constituting the housing, a screw hole may be formed in the metal plate.
  • FIG. 11 is a diagram schematically showing a screw hole included in a conventional metal plate, and is a vertical cross-sectional view when seen in a cross section including the central axis of the screw hole.
  • a metal plate 510 having a screw hole is shown.
  • a male screw 550 and another metal plate 551 having a through hole 551a are further illustrated with imaginary lines. Show.
  • the metal plate 510 shown in the figure has a cylindrical vertical wall portion 511 that functions as a screw hole (hereinafter, this vertical wall portion 511 may be referred to as a screw hole 511).
  • One end of the vertical wall portion 511 is continuous with the main body 513 of the metal plate, and an internal thread 511b is formed on the inner peripheral surface.
  • FIG. 12A and FIG. 12B are longitudinal sectional views schematically showing an example of a process for forming a screw hole in a conventional metal plate, FIG. 12A shows a drilling step, and FIG. 12B shows a burring step.
  • a pilot hole is made in the metal plate 520 to be processed. Drilling of the pilot hole can be performed by shearing or cutting.
  • a punch 531 and a die 532 for drilling as shown in FIG. 12A are used.
  • a part of the metal plate 520 is pushed into the through hole of the die 532 together with the punch 531.
  • a part of the metal plate 520 is cut out and separated by blades provided on the punch 531 and the die 532, respectively, thereby making a pilot hole.
  • An elongated flange, which becomes a vertical wall portion, is formed on the metal plate 520 with a prepared hole by burring.
  • a burring punch 533, a burring die 534, and a blank holder 539 are used for burring.
  • the punch 533, the die 534 and the blank holder 539 are moved so as to be relatively close to each other, and the punch 533 and the bottom of the metal plate 520 are moved.
  • the peripheral part of the hole is pushed into the recess of the die 534.
  • the peripheral portion of the prepared hole of the metal plate 520 is expanded in the radial direction while being extended in the pushing direction of the punch 533, and as a result, a cylindrical extending flange, that is, the vertical wall portion 511 is formed.
  • the screw hole 511 can be formed in the metal plate 520 by processing the internal thread 511b using, for example, a tap (not shown) on the inner peripheral surface of the cylindrical vertical wall portion 511 formed in this way.
  • the housing proposed in Patent Document 1 has a screw hole formed in the second sheet metal member among the constituent members.
  • the screw hole of the second sheet metal member has a first flat plate portion and a second flat plate portion that are formed so that the end edges of the sheet metal member are folded and arranged opposite to each other.
  • the screw hole of the second sheet metal member further protrudes in a cylindrical shape from the first flat plate portion and has a threaded portion on the inner peripheral surface, and protrudes in a cylindrical shape from the second flat plate portion and has an inner periphery.
  • the surface has a threaded portion, and has a second cylindrical portion arranged substantially in series with the first cylindrical portion.
  • the female screw is formed as a threaded portion on the inner peripheral surface of the first cylindrical portion and the second cylindrical portion, the axial dimension in contact with the male screw is lengthened to increase the tightening torque. It is explained that it can be secured.
  • Patent Document 2 discloses a first thin plate in which a first cylindrical portion is formed and a second thin plate in which a second cylindrical portion is formed, and the first cylindrical portion is provided in the second cylindrical portion.
  • a structure in which the second thin plate is fastened to the first thin plate by screwing a tapping screw into the inner peripheral surface of the first cylindrical portion from the second thin plate side after being overlapped so as to be fitted coaxially is disclosed. Has been.
  • a female screw 511b is formed on the inner peripheral surface of the vertical wall portion (extension flange) 511 formed by burring.
  • the fastening force with the male screw is reduced as the metal plate used for home appliances, automobile parts, and the like is required to be lighter.
  • deformation of the screw hole 511 may cause the screw hole 511 and the male screw 550 not to mesh with each other, that is, the screw hole 511 may be damaged.
  • the paragraph number [0014] states that “the first cylindrical portion is inflated radially outward and pressed against the second cylindrical portion, so that the thin plates are firmly connected with the screw member without loosening. As described in ‘Fixed’, the play between the first tubular portion and the second tubular portion is eliminated, thereby aiming to prevent relative displacement between the first thin plate and the second thin plate. .
  • the second cylindrical shape can be sufficiently obtained even if the first cylindrical portion is expanded radially outward. As a result, the above-described effects may not be obtained.
  • Patent Document 2 is not always sufficient from the viewpoint of reliably obtaining a sufficient fastening force.
  • the present invention has been made in view of the above circumstances, and is capable of reducing an increase in processing cost, and having a screw hole with excellent fastening force with a male screw even when the thickness is reduced, and capable of preventing the screw hole from being damaged. It aims at providing the metal plate with a hole, the housing
  • the present inventors analyzed a decrease in screw fastening force and a phenomenon of breakage caused by thinning of the conventional metal plate described in FIG. 11, and the following (a) to (d): Got the factor.
  • A In the burring process, the base portion of the vertical wall portion 511 is thinned with the formation of the cylindrical vertical wall portion 511.
  • the “root portion” means a portion 511a of the vertical wall portion 511 that is continuous with the metal plate main body 513 as shown by being surrounded by a two-dot chain line in FIG.
  • B Since the thread groove is processed up to the root portion where the thickness is reduced by the thinning of (a), a portion having a very thin thickness is generated.
  • the present inventors have found that the screw hole is divided into a cylindrical outer wall portion rising from a metal plate and a cylindrical inner wall portion folded inward from the outer wall portion. It was conceived that a heavy wall was formed and a female screw was formed on the inner peripheral surface of the inner wall. Thereby, even when the thickness of the metal plate is reduced, the screw hole is excellent in fastening force with the male screw, and damage to the screw hole can be prevented.
  • the present inventors configure a double wall of a cylindrical inner wall portion that rises from a metal plate and a cylindrical outer wall portion that is folded outward from the inner wall portion. Further, it has been conceived that substantially the same effect can be obtained even in a configuration in which a female screw is formed on the inner peripheral surface of the inner wall portion.
  • One aspect of the present invention is a metal plate having a screw hole, wherein the screw hole rises from one surface of the metal plate, and the outer wall extends from an edge of the outer wall portion.
  • a metal plate with a screw hole including a cylindrical inner wall portion folded inside the portion, and an internal thread formed on the inner peripheral surface of the inner wall portion.
  • the tip of the inner wall portion and the other surface of the metal plate may be flush with each other.
  • the outer peripheral surface of the inner wall portion is separated from the inner peripheral surface of the outer wall portion in a state where a male screw is not screwed into the female screw of the screw hole.
  • the tip of the inner wall portion and the other surface of the metal plate may be flush with each other.
  • Another aspect of the present invention is a metal plate having a screw hole, wherein the screw hole rises from one surface of the metal plate, and the edge of the inner wall portion
  • a metal plate with a screw hole according to any one of (1) to (5) above.
  • Still another embodiment of the present invention is a method for producing a metal plate with a threaded hole according to any one of (1) to (4) above, wherein the outer wall portion and an inner side of the outer wall portion are provided. Forming a disk part continuous with the metal plate, forming a pilot hole in the center of the disk part, and bending the disk part with the pilot hole inside the outer wall part. Forming the inner wall portion, and processing the female thread on the inner peripheral surface of the molded inner wall portion.
  • the following formula (a) A punch having a shoulder size with a radius R (mm) satisfying the above may be used. 0.5 ⁇ R / t ⁇ 1.0 (a) Formula (9)
  • the pilot hole is formed on the metal plate having a thickness dimension t (mm).
  • the pilot hole may be formed so that a radius r (mm) of the pilot hole satisfies the following formula (b).
  • Still another embodiment of the present invention is a method for manufacturing a metal plate with a threaded hole according to any one of the above (1) to (4), wherein a pilot hole is formed in the metal plate. Forming the outer wall part and a disk part continuous to the inside of the outer wall part concentrically with the pilot hole, and forming the inner wall part by bending the disk part to the inside of the outer wall part. And a step of processing the female screw on the inner peripheral surface of the inner wall portion.
  • the metal plate with a threaded hole according to one aspect of the present invention described in the above (1) to (4) has a double wall structure having an outer wall portion and an inner wall portion folded inward from the outer wall portion. ing. According to this configuration, when the male screw is screwed into the female screw of the inner wall portion, the inner wall portion is subjected to the pressing force of the male screw and tends to be spread outward in the radial direction, but is supported by the outer wall portion around it. Therefore, excessive deformation of the inner wall portion is restricted. As a result, it is possible to prevent a screw hole from being damaged and a decrease in fastening force due to excessive expansion of the inner wall.
  • the inner wall portion is always in a state of being given elastic force in the direction of diameter reduction due to the springback effect that occurs when the inner wall portion is folded back inside the outer wall portion.
  • the male screw is screwed into the female screw of the inner wall portion
  • the female screw is always pressed against the male screw and comes into close contact with each other, so that a high fastening force without loosening can be secured.
  • the conventional female screw is not formed on the outer wall portion, it is possible to prevent the root portion of the outer wall portion from being further thinned and easily damaged by the female screw formation.
  • the internal thread is formed in the base part of an inner wall part, since the circumference
  • the screw hole is excellent in fastening force with the male screw and can be prevented from being damaged even if the plate thickness is reduced.
  • the metal plate with a screw hole has a double wall structure having an inner wall portion and an outer wall portion that is folded outward from the inner wall portion.
  • the inner wall portion is subjected to the pressing force of the male screw and tends to be spread outward in the radial direction, but is supported by the outer wall portion around it. Therefore, excessive deformation of the inner wall portion is restricted. As a result, it is possible to prevent a screw hole from being damaged and a decrease in fastening force due to excessive expansion of the inner wall.
  • the housing according to the aspect described in (6) includes the above-described metal plate with a screw hole, the screw hole has excellent fastening force with a male screw and can prevent the screw hole from being damaged. Therefore, it is possible to prevent the screwed male screw from loosening.
  • the method for manufacturing a metal plate with a screw hole according to the embodiments described in the above (7) to (14) can process a screw hole that has excellent fastening force and can prevent breakage as described above. In addition, increases in the number of processes and processing costs can be reduced.
  • FIG. 2 is an enlarged view of a portion A in FIG. 1, after a tapping screw is screwed in. It is a disassembled perspective view which shows the housing
  • a metal plate with a screw hole of the present invention a housing including the metal plate with a screw hole, and a manufacturing method of the metal plate with a screw hole will be described with reference to the drawings.
  • the metal plate with a screw hole of this invention is applicable to both a steel plate without plating and a plated steel plate.
  • FIG. 1 is a diagram schematically showing a screw hole of a metal plate 10 with a screw hole according to the present embodiment, and is a longitudinal sectional view when seen in a cross section including a central axis CL of the screw hole.
  • the metal plate 51 which has the external thread 50 and the through-hole 51a is also shown with the imaginary line.
  • the screw hole 12 included in the metal plate 10 with a screw hole of the present embodiment (hereinafter also simply referred to as the metal plate 10) includes an outer wall portion 12a and an inner wall portion 12b.
  • the outer wall portion 12 a has a cylindrical shape that rises substantially vertically from the main body 10 a of the metal plate 10.
  • the base portion 12a1 that is one end in the axial direction is continuous with the main body 10a, and the central axis CL thereof is perpendicular to the surface 10x of the main body 10a.
  • the other end 12a2 of the outer wall portion 12a in the direction along the central axis CL is continuous with the root portion 12c of the inner wall portion 12b.
  • the inner wall portion 12b has a cylindrical shape arranged coaxially with the outer wall portion 12a, and is formed by being folded inward from the upper end (the other end 12a2) of the outer wall portion 12a.
  • the internal thread 12b1 is formed in the internal peripheral surface of the inner wall part 12b.
  • the screw hole 12 of the metal plate 10 with the screw hole of the present embodiment can reduce the thinning at the root portion 12c of the inner wall portion 12b and improve the fastening force of the screw hole 12 even when the plate thickness t is reduced. At the same time, breakage of the screw hole 12 can be prevented.
  • the metal plate 10 with the screw hole of the present embodiment can suppress the thinning of the root portion 12c of the inner wall portion 12b will be described later.
  • “the root portion 12c of the inner wall portion 12b” means a portion that is continuous with the other end 12a2 of the outer wall portion 12a as shown by being surrounded by a one-dot chain line in FIG.
  • the screw hole 12 included in the metal plate 10 with the screw hole of the present embodiment has a double wall structure including an outer wall portion 12a and an inner wall portion 12b formed by folding back the outer wall portion 12a.
  • the inner wall portion 12b receives a force in the diameter increasing direction by pressing from the male screw 50 during the screwing operation or loosening operation of the male screw 50, the inner wall portion 12b is supported from the periphery by the outer wall portion 12a. It is possible to prevent excessive deformation in the diameter expansion direction, and it is possible to prevent the fastening force from being lowered and the screw hole 12 from being damaged.
  • the screw hole 12 included in the metal plate 10 with the screw hole according to the present embodiment is formed so that the outer peripheral surface of the inner wall portion 12b is in contact with the inner peripheral surface of the outer wall portion 12a at the time of bending as described in the manufacturing method described later.
  • the molded inner wall 12b is slightly deformed in the direction of diameter reduction by the spring back. Therefore, in a state where the male screw 50 is not screwed into the female screw 12b1 of the screw hole 12, the outer peripheral surface of the inner wall portion 12b is separated from the inner peripheral surface of the outer wall portion 12a, and the male screw 50 is screwed into the female screw 12b1 of the screw hole 12. In this state, at least a part of the outer peripheral surface of the inner wall portion 12b is in contact with the inner peripheral surface of the outer wall portion 12a. This configuration will be described in more detail with reference to FIGS.
  • the tip 12b3 of the inner wall portion 12b is caused to be the root portion of the outer wall portion 12a by the spring back generated after the screw hole 12 is formed by bending. It is slightly separated from 12a1. Therefore, a slight gap is formed between the outer peripheral surface of the inner wall portion 12b and the inner peripheral surface of the outer wall portion 12a. Subsequently, as shown in FIG.
  • the inner wall portion 12 b that has received the pressing force by the male screw 50 is elastically deformed in the diameter increasing direction according to the amount of spring back, As a result, the outer peripheral surface of the inner wall portion 12b abuts on the inner peripheral surface of the outer wall portion 12a, and the gap is eliminated. Therefore, as described above, the deformation of the inner wall portion 12b is received and regulated by the outer wall portion 12a.
  • the inner wall portion 12b exhibits a restoring force to return to the state of FIG. Due to this restoring force, the inner wall portion 12b is urged toward the male screw 50 as shown by an arrow X in FIG. 3, so that the female screw 12b1 and the male screw 50 are kept in close contact with each other. Therefore, the fastening force between the screw hole 12 and the male screw 50 can be further increased to prevent the male screw 50 from loosening.
  • the screw holed metal plate 10 of the present embodiment includes the cylindrical outer wall portion 12a in which the screw hole 12 rises perpendicularly from one surface 10x of the metal plate 10 and the upper end edge of the outer wall portion 12a.
  • a cylindrical inner wall portion 12b folded inside the outer wall portion 12a, and an internal thread 12b1 is formed on the inner peripheral surface of the inner wall portion 12b.
  • tip 12b3 of the inner wall part 12b and the other surface 10y of a metal plate are flush
  • the degree of unevenness due to the formation of the screw holes 12 is minimized. It is possible to limit the length of the female screw 12b1 to the maximum. Therefore, the metal plate 10 with a screw hole which has both aesthetics and fastening force can be obtained.
  • the housing 70 according to the present embodiment includes the above-described metal plate 10 with screw holes, a member (metal plate) 51 having a through hole 51a, and a screw hole inserted in the through hole 51a. 12 and a male screw 50 that joins between the screw-holed metal plate 10 and the member 51.
  • 4 is an exploded perspective view, but a cross-sectional view of the main part of the screw hole 12 in a state where the metal plate 10 with the screw hole and the member 51 are joined by screwing the male screw 50 into the screw hole 12 is shown in FIG. It is as shown in.
  • the housing 70 of this embodiment since the metal plate 10 with a screw hole has the above-described structure, the fastening force between the screw hole 12 and the male screw 50 is excellent, and the screw hole 12 can be prevented from being damaged. It has become. Moreover, it is the housing
  • the member 51 which is a metal plate having a through-hole 51a, is attached to the tip 12b3 side of the inner wall portion 12b.
  • the present invention is not limited to this configuration.
  • a mounting configuration can also be adopted. That is, in FIG. 1, the vertical arrangement relationship between the metal plate 10 with the screw holes and the member 51 may be reversed.
  • the “tip 12b3 of the inner wall portion 12b” means an end located opposite to the root portion 12c in the direction along the central axis CL.
  • the member 51 is not limited to a metal plate, and includes an accessory having a through hole.
  • the manufacturing method of the metal plate 10 with a screw hole of this embodiment is demonstrated.
  • the hole making step is performed after the outer wall portion forming step, but a modified example (described later) in which the outer wall portion forming step is performed after the hole making step can also be employed.
  • FIG. 5A to 5D are schematic diagrams showing a processing flow of the metal plate manufacturing method of the present embodiment, in which FIG. 5A is an outer wall forming step, FIG. 5B is a drilling step, FIG. 5C is an inner wall forming step, and FIG. Indicates the female thread forming step.
  • the outer wall portion forming step the outer wall portion 20a and the disc portion 20b connected to the outer wall portion 20a are formed on the metal plate 20 (material) to be processed.
  • the cylindrical outer wall portion 20 a rises from the metal plate 20 such that one end in the direction of the central axis CL is continuous with the main body of the metal plate 20 and the central axis CL is perpendicular to the surface of the metal plate 20.
  • the inner side of the other end in the direction of the central axis CL of the outer wall portion 20a is continuous with the disc portion 20b.
  • the outer wall portion 20a and the disc portion 20b having such a shape can be formed by overhanging or drawing using a punch and a die.
  • a blank holder 36a is further used in addition to the overhanging punch 35 and the overhanging die 36.
  • the punch 35, the die 36 and the blank holder 36 a are moved relative to each other, and a part of the metal plate 20 is moved together with the punch 35. Push into the die 36. Thereby, the cylindrical outer wall portion 20a and the disc portion 20b are formed on the metal plate 20.
  • a pilot hole is drilled in the center of the disc portion 20b. That is, as shown in FIG. 5B, the pilot hole 20b1 is formed in the disc portion 20b by performing drilling by shearing using the punch 31 for punching and the die 32 for drilling. Drilling can also be performed by cutting using a drill or drilling with a laser cutting machine.
  • the inner wall portion 12b is formed by folding the disk portion 20b having the prepared hole 20b1 and folding it inside the outer wall portion 20a (12a).
  • the disk portion 20b can be bent by a so-called hole expanding process.
  • the hole expanding process can be performed using a hole expanding punch 37, a hole expanding die 38 and a blank holder 39 as shown in FIG. 5C. That is, with the die 38 and the blank holder 39 sandwiching the metal plate 20 from the front and back surfaces, the punch 37 and the die 38 and the blank holder 39 are relatively moved. At that time, the punch 37 is pressed into the pilot hole 20b1.
  • the disc portion 20b of the metal plate 20 is pushed into the outer wall portion 20a together with the punch 37, the disc portion 20b is expanded in the radial direction while being stretched in the pushing direction of the punch 37.
  • An inner wall portion 12b (20b) that is cylindrical and is folded inward from the outer wall portion 12a (20a) is formed.
  • the outer peripheral surface of the inner wall portion 12b is formed so as to be in contact with the inner peripheral surface of the outer wall portion 12a.
  • the inner wall portion 12b is slightly deformed in the diameter reducing direction by the spring back, as shown in FIG. A gap occurs.
  • the internal thread 12b1 is processed on the inner peripheral surface of the formed inner wall 12b.
  • the internal thread 12b1 can be processed with the tap 40.
  • FIG. 5D the metal plate 10 with a screw hole, that is, the screw hole 12 including the outer wall portion 12a and the inner wall portion 12b obtained by folding back a part of the outer wall portion 12a, The plate 20 can be processed.
  • the manufacturing method of the present embodiment it is possible to reduce the thinning at the root portion of the screw hole as compared with the conventional method of forming the screw hole using burring as described with reference to FIG. That is, in the conventional manufacturing method, as shown in FIG. 12B, in the state of holding the metal plate 520 between the die 534 and the blank holder 539 during the burring process, together with the punch 533, the peripheral portion of the metal plate 520 Is pushed into the recess of the die 534 and deformed to form the vertical wall portion 511.
  • the base portion 511 a around the deformed pilot hole and the portion sandwiched between the die 534 and the blank holder 539 are close to each other, so that the base portion of the vertical wall portion 511 is very large. Tensile stress is generated and, as a result, thinning is promoted.
  • the circular plate portion 20b and the outer wall portion 20a (12a) together with the punch 37 are sandwiched between the die 38 and the blank holder 39 in the inner wall portion forming step.
  • the inner wall portion 12b is formed by being pushed and deformed inside.
  • the outer wall portion 12 a is interposed between the deformed disc portion 20 b and the portion sandwiched between the die 38 and the blank holder 39 in the metal plate 20.
  • the fastening force between the formed screw hole 12 and the male screw 50 can be improved, and damage to the screw hole 12 can be prevented.
  • the screw hole 12 has a double wall structure of the outer wall portion 12a and the inner wall portion 12b, the inner wall portion 12b can be prevented from being deformed in the diameter increasing direction, and the fastening force is reduced by deformation and the screw hole 12 Damage can be prevented.
  • the disk portion 20 b is bent to form the inner wall portion 12 b, when the male screw 50 is screwed into the screw hole 12, a restoring force is generated by the spring back of the inner wall portion 12 b, and the inner wall portion 12 b comes into close contact with the male screw 50. As a result, the fastening force of the screw hole 12 is further improved, and the screwed male screw 50 can be more reliably prevented from loosening.
  • the screw hole 12 can be formed by four steps of outer wall forming, drilling, inner wall forming, and female screw forming. Therefore, compared with the conventional screw hole proposed in Patent Document 1 described above, Increase in processing man-hours can be reduced. In the above four steps, high machining accuracy is not required. Therefore, according to the manufacturing method of the present embodiment, an increase in processing cost can be reduced as compared with the screw hole proposed in Patent Document 1 described above.
  • FIGS. 6A to 6D show a drilling step
  • FIG. 6B shows an outer wall forming step
  • FIG. 6C shows an inner wall forming step
  • FIG. 6D shows an internal thread forming step.
  • a pilot hole is first drilled in the drilling step. That is, as shown in FIG. 6A, drilling is performed by shearing using a punch 31 for punching and a die 32 for drilling, and a pilot hole 20b1 is made in the metal plate 20 to be processed. Drilling can also be performed by cutting using a drill or drilling with a laser cutting machine.
  • a cylindrical outer wall portion 20a and a disc portion 20b continuous with the outer wall portion 20a are formed on the metal plate 20.
  • the cylindrical outer wall portion 20 a rises from the metal plate 20 so that the base portion, which is one end in the axial direction, is continuous with the metal plate 20 and the center axis CL is perpendicular to the surface of the metal plate 20.
  • the inner side of the other end of the outer wall part 20a in the direction along the center axis line CL is continuous with the disk part 20b.
  • the outer wall portion 20a and the disc portion 20b are formed such that the pilot hole 20b1 and the cylindrical outer wall portion 20a are concentric.
  • the outer wall portion 20a and the disk portion 20b can be formed by overhanging or drawing using a punch and a die.
  • a blank holder 36a is used in addition to the overhanging punch 35 and the overhanging die 36 shown in FIG. 6B.
  • the metal plate 20 is disposed so that the center of the pilot hole 20b1 coincides with the center of the recess of the die 36, and the metal plate 20 is sandwiched between the die 36 and the blank holder 36a.
  • the punch 35, the die 36, and the blank holder 36a are relatively moved, and a part of the metal plate 20 is pushed into the die 36 together with the punch 35.
  • the cylindrical outer wall portion 20a and the disc portion 20b are formed on the metal plate 20.
  • the pilot hole 20b1 is deformed and expanded in diameter.
  • the inner disk portion 12b is formed by folding the formed disc portion 20b inward from the outer wall portion 12a.
  • the female screw 12b1 is processed on the inner peripheral surface of the inner wall portion 12b.
  • the bending of the disc portion 20b can be performed by hole expansion processing as in the above-described embodiment.
  • the processing of the female screw 12b1 is not particularly limited as in the above-described embodiment, and can be processed by the tap 40, for example.
  • the screw hole 12 provided with the outer wall portion 12a and the inner wall portion 12b can be formed in the metal plate 20 also by the manufacturing method of the above modification. Also in this modified example, when the disk part 20b is bent in the inner wall part forming step, between the disk part 20b to be deformed and the part sandwiched between the die 38 and the blank holder 39 in the metal plate 20. The outer wall 12a is interposed. For this reason, the thickness reduction of the root portion 12c of the inner wall portion 12b can be reduced. As a result, the fastening force of the screw hole 12 can be improved and the screw hole 12 can be prevented from being damaged.
  • the obtained screw hole 12 has a double wall structure having the outer wall portion 12a and the inner wall portion 12b. Therefore, the inner wall portion 12b is excessively increased in the diameter increasing direction. It is possible to prevent the deformation, thereby preventing the fastening force from being lowered and the screw hole 12 from being damaged. Further, when the male screw 50 is screwed into the screw hole 12, the inner wall portion 12b is brought into close contact with the male screw 50 by the spring back. Thereby, the fastening force of the screw hole 12 can be further improved, and the screwed male screw 50 can be prevented from loosening.
  • the screw hole 12 can be formed by four steps of drilling, outer wall forming, inner wall forming, and female screw forming, the number of processing is increased compared to the conventional screw hole proposed in Patent Document 1 described above. Can be suppressed. In addition, high processing accuracy is not required for the above four steps. Therefore, this modification can reduce an increase in processing cost as compared with the screw hole proposed in Patent Document 1 described above.
  • the steps of forming the outer wall portion and the inner wall portion can be performed with the same apparatus, and in this case, the increase in the number of processing can be further suppressed.
  • the hole expanding punch 37 (not shown) shown in FIG. 6C is arranged so as to face the overhanging punch 35.
  • the inner wall portion 12b can be immediately formed with the hole expanding punch 37.
  • the “shoulder radius” of the punch 35 refers to the outer peripheral surface of the punch 35 that contacts the outer wall portion 20a (12a) formed on the metal plate 20 and the punch 35 that contacts the formed disk portion 20b. This means the radius of the R portion connecting the tip surface (see FIGS. 5A and 6B).
  • the “radius of the pilot hole before the inner wall part molding in the inner wall part molding step” specifically corresponds to the radius of the pilot hole 20b1 drilled in the drilling step shown in FIG. 5B in the above embodiment, In the modified example, the radius of the prepared hole 20b1 in the state of being deformed in the diameter increasing direction in the outer wall portion forming step shown in FIG. 6B after the drilling step is applicable.
  • the punch 35 connects the outer wall portion 20a (12a) and the disc portion 20b to the R portion (curved portion). ), And this part may be thinned and lead to breakage, resulting in a product failure, and the production yield is reduced.
  • the radius R (mm) of the shoulder of the punch 35 is larger than 1.0 ⁇ t (mm)
  • an R portion (curved portion) connecting the outer wall portion 20a (12a) and the disc portion 20b in the inner wall portion forming step As a result, the outer wall portion 20a (12a) falls to the inner wall portion 12b side, and as a result, the product may be defective.
  • the radius r (mm) of the pilot hole 20b1 is smaller than 0.5 ⁇ t (mm)
  • Power is excessive.
  • the R portion (curved portion) connecting the outer wall portion 20a (12a) and the main body of the metal plate 20 is deformed, and as a result, the inner wall portion 12b and the outer wall portion 20a (12a) cannot be formed, resulting in a product defect. There is a decrease in manufacturing yield.
  • the inner wall portion 12b formed by the inner wall portion forming step has a small height and a small number of threads. For this reason, there exists a possibility that sufficient fastening force with the external thread 50 cannot be obtained.
  • the punch 37 having a tapered portion at the tip as shown in FIGS. 5C and 6C in the inner wall forming step.
  • the reason for this is that if a punch 37 provided with a tapered portion whose outer diameter decreases as it approaches the tip as compared with the straight-shaped burring punch 533 shown in FIG. This is because it is easy to promote bending deformation at the R portion (bending portion) connecting the outer wall portion 20a (12a) and the disc portion 20b, and the falling of the outer wall portion 20a (12a) can be suppressed.
  • FIG. 7 is a diagram schematically illustrating the screw hole 12 of the metal plate 100 with the screw hole according to the present embodiment, and corresponds to FIG. 3 when viewed in a cross section including the central axis CL of the screw hole 12. It is a longitudinal cross-sectional view.
  • the length dimension L1 of the inner wall part 12b is longer than the thing of the said 1st Embodiment.
  • the front end 12b3 of the inner wall portion 12b protrudes from the other surface 10y of the metal plate.
  • the protruding portion of the inner wall portion 12 b is replaced with the other metal plate 51.
  • the alignment can be easily performed.
  • the length dimension of the female screw 12b1 can be made longer than that of the first embodiment, the length of the portion screwed with the male screw 50 can be made longer and fastening can be performed more reliably.
  • FIG. 8 is a diagram schematically showing the screw hole 12 of the metal plate 110 with the screw hole according to the present embodiment, and corresponds to FIG. 3 when viewed in a cross section including the central axis CL of the screw hole 12. It is a longitudinal cross-sectional view.
  • the length dimension L2 of the inner wall part 12b is shorter than the thing of the said 1st Embodiment.
  • the front end 12b3 of the inner wall portion 12b is at a position deeper than the other surface 10y of the metal plate. Therefore, when screwing, a slight gap is generated between the surfaces of the other metal plates 51.
  • the inner wall portion 12b is shorter than in the case of the first embodiment. The length of the portion screwed with the male screw 50 is shortened.
  • the inner wall portion 12b is allowed to have its tip 12b3 approaching the screw head of the male screw 50. Then, when the male screw 50 is tightened, the male screw 50 tries to draw the inner wall portion 12b toward itself, and as a result, the cylindrical inner wall portion 12b attempts to reduce the diameter. As a result, the inner wall portion 12b is more closely attached to the male screw 50, and a high fastening force can be ensured.
  • FIG. 9 is a diagram schematically showing the screw hole 212 of the metal plate 200 with a screw hole according to the present embodiment, and corresponds to FIG. 3 when viewed in a cross section including the central axis CL of the screw hole 212. It is a longitudinal cross-sectional view.
  • the metal plate 200 with a screw hole of the present embodiment is a metal plate having a screw hole 212, and the screw hole 212 rises from one surface of the metal plate 220, and an end of the inner wall portion 212b.
  • a cylindrical outer wall portion 212a folded from the edge to the outside of the inner wall portion 212b is provided, and a female screw 212b1 is formed on the inner peripheral surface of the inner wall portion 212b.
  • the effect of the spring back by the inner wall portion 212b is not obtained, but the deformation of the inner wall portion 212b in the diameter increasing direction when the male screw (not shown) is tightened is prevented. It can be received by the part 212a.
  • the metal plate 200 with a screw hole of this embodiment can also be used as a component of a housing
  • a screw hole was formed in the metal plate by the method for manufacturing a metal plate with a screw hole of the present invention, and a test for evaluating the fastening force of the screw hole was performed.
  • a steel plate having a thickness of 0.4 to 0.6 mm and a tensile strength of 270 MPa was used as a test material.
  • screw holes with a nominal diameter of M3 in JIS B0205 (2001) were machined by the method for manufacturing a metal plate with screw holes according to the first embodiment described with reference to FIGS. 5A to 5D.
  • the outer wall portion forming step is performed by an overhanging process, and uses an overhanging punch 35 having an outer diameter of 3.2 mm, a die 36 having a concave portion having an inner diameter of 4.6 mm, and a blank holder 36a. Part 20a was molded. At that time, the shoulder radius R of the overhanging punch 35 was changed. Further, the drilling step was performed by a shearing process using the drilling punch 31 and the drilling die 32, and the radius r of the pilot hole 20b1 was changed at that time. The inner wall portion forming step was performed using a hole expanding punch 37 having a tapered tip, a hole expanding die 38 and a blank holder 39.
  • the hole expanding punch 37 has a straight portion with a radius of 1.2 mm, a corner portion of the tapered portion having a chamfer of 60 ° with respect to the central axis CL, and a radius of the distal end of the tapered portion of 1.4 mm. I used something.
  • a metal plate 10 with a screw hole in which a screw hole by a conventional burring process is formed on a metal plate was also manufactured by the processing flow described with reference to FIGS. 12A and 12B (Test Nos. 1-1A, 2- 1A, 3-1A).
  • a metal plate with a screw hole (not shown) having the structure shown in FIG. 1 of Patent Document 2 cited in the background art was also manufactured (Test Nos. 1-1B, 2-1B, 3). -1B). If this comparative example is described with reference to FIG. 1 shown in the first embodiment, even when the male screw 50 is screwed in, the inner peripheral surface of the outer wall portion 12a and the outer peripheral surface of the inner wall portion 12b are separated and have a large gap. This is a structure in which the periphery of the inner wall portion 12b is not supported by the outer wall portion 12a.
  • a test for evaluating the fastening force was performed on the screw holes of each metal plate with screw holes.
  • the male screw was screwed into the screw hole of the metal plate using a screw fastening device capable of measuring the tightening torque.
  • the relationship between the rotation angle of the male screw and the tightening torque was measured. Differentiating the relationship between the rotation angle (°) of the obtained male screw and the tightening torque (N ⁇ m) with respect to the rotation angle, the rate of change of the rotation angle (°) of the male screw and the tightening torque (N ⁇ m / °) Sought a relationship with.
  • FIG. 10 is a schematic diagram showing the relationship between the rotation angle of the male screw and the tightening torque and the relationship between the rotation angle of the male screw and the change rate of the tightening torque in the test for evaluating the fastening force of the screw hole.
  • the rotation angle increases as the male screw is screwed in
  • the tightening torque starts to increase from a constant state at approximately 0 (zero) in the initial stage, then becomes substantially constant again, and then decreases.
  • a point O at which the tightening torque is 0 and the state is increased from a constant state was obtained.
  • the straight line L connecting the points O and A thus obtained was drawn. Also, a straight line L ′ obtained by translating the straight line L by 10 ° in the direction in which the rotation angle increases is drawn. An intersection point of the straight line L ′ and a curve indicating the relationship between the rotation angle and the tightening torque was defined as a point B.
  • the ratio (TB / TA, dimensionless) of the tightening torque (N ⁇ m) at point B to the tightening torque TA (N ⁇ m) at point A was calculated.
  • Such TB / TA indicates a rate at which the fastening torque is maintained after the female screw starts plastic deformation, in other words, a rate at which the fastening force with the male screw in the screw hole is maintained after the female screw starts plastic deformation. .
  • Tables 1 to 3 show the test numbers in each test. , Thickness t of metal plate, processing method of screw hole, shoulder radius R of overhanging punch, R / t value, conformity with the above formula (1), radius of pilot hole before inner wall forming
  • the values of r and r / t, whether or not the equation (2) is satisfied, the production yield, the value of the fastening force index TB / TA and its evaluation, and the test category are shown.
  • the conformity to the equation (1) indicates that the value of R / t satisfies the equation (1) in the case of “Y”, and the value of R / t is in the case of “N”.
  • (1) Indicates that the expression is not satisfied.
  • the conformity to the equation (2) indicates that the value of r / t satisfies the equation (2) when “Y”, and the value of r / t when the value is “N”. 2) Indicates that the expression is not satisfied.
  • the fastening force was evaluated as BD in the comparative example, but as VG, GD, or FA in the example of the present invention. Therefore, the metal plate with a screw hole of this invention, the housing
  • the base of the vertical wall portion is broken by thinning due to burring, or the thread of the screw hole cannot be sufficiently formed by threading.
  • the number of occurrences increased as the thickness of the specimen became thinner.
  • the production yield was 70% or less.
  • the internal thread portion corresponding to the inner wall portion is not supported by the peripheral portion corresponding to the outer wall portion, so the rigidity is low.
  • the screw hole has excellent fastening force with a male screw even when it is thinned. Damage to screw holes can be prevented. Therefore, if the metal plate with a threaded hole of the present invention, the housing provided with the metal plate with a threaded hole, and the method for producing the metal plate with a threaded hole are applied to an outdoor unit of an air conditioner or a housing of a substation facility, This can greatly contribute to thinning.
  • Metal plate with screw hole 10x One surface of metal plate 10y: Other surface of metal plate 12: Screw hole 12a, 212a: Outer wall portion 12b, 212b: Inner wall portion 12b1, 212b1: Female screw 12b3: tip of inner wall portion 20b: disc portion 37: punch 50: male screw 51: member 51a: through hole 70: housing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Plates (AREA)
  • Punching Or Piercing (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Finishing Walls (AREA)
  • Domestic Plumbing Installations (AREA)
  • Door And Window Frames Mounted To Openings (AREA)
  • Forging (AREA)

Abstract

In the metal plate with a tapped hole, the tapped hole is provided with a cylindrical outer wall section that rises from one surface of the metal plate and a cylindrical inner wall section, which is folded back from the edge of the outer wall section on the inside of the outer wall section. A female screw is formed on the inner circumferential surface of the inner wall section.

Description

ねじ穴付き金属板、筐体、及び、ねじ穴付き金属板の製造方法Metal plate with screw hole, housing, and method for manufacturing metal plate with screw hole
 本発明は、ねじ穴付き金属板と、筐体と、ねじ穴付き金属板の製造方法とに関する。さらに詳しくは、薄肉化した場合でも、雄ねじとの締結力に優れたねじ穴を有するとともに同ねじ穴の破損をも防止できるねじ穴付き金属板と、同ねじ穴付き金属板を具備する筐体と、前記ねじ穴付き金属板の製造方法とに関する。
 本願は、2013年07月25日に、日本国に出願された特願2013-154105号に基づき優先権を主張し、その内容をここに援用する。
The present invention relates to a metal plate with a screw hole, a housing, and a manufacturing method of the metal plate with a screw hole. More specifically, a metal plate with a screw hole that has a screw hole excellent in fastening force with a male screw and can prevent the screw hole from being damaged, and a housing having the metal plate with the screw hole even when the thickness is reduced And a method of manufacturing the metal plate with screw holes.
This application claims priority based on Japanese Patent Application No. 2013-154105 for which it applied to Japan on July 25, 2013, and uses the content here.
 エアコンの室外機や変電設備の筐体には、切断加工や曲げ加工により様々な形状に加工された金属板が多用されている。この種の金属板と、筐体を構成する他の金属板や付属部品との取り付け部分には、ねじ構造が広く用いられているため、金属板にねじ穴を造形する場合がある。 The metal plates processed into various shapes by cutting and bending are often used for the outdoor units of air conditioners and the housing of substation equipment. Since a screw structure is widely used for the attachment part of this type of metal plate and other metal plates and accessory parts constituting the housing, a screw hole may be formed in the metal plate.
 図11は、従来の金属板が有するねじ穴を模式的に示す図であって、ねじ穴の中心軸線を含む断面で見た場合の縦断面図である。同図には、ねじ穴を有する金属板510を示しているが、その構成の理解を容易にするために、さらに、雄ねじ550と、貫通孔551aを有する他の金属板551とを想像線で示している。同図に示す金属板510は、ねじ穴の役割を果たす円筒状の縦壁部511を有する(以下、この縦壁部511をねじ穴511と呼ぶ場合が有る)。縦壁部511は、一端が金属板の本体513と連続し、内周面に雌ねじ511bが形成されている。この金属板510に対し、貫通孔551aを有する金属板551を重ね合わせて取り付ける際には、貫通孔551aに雄ねじ550を挿入してねじ穴511内にねじ込むことにより結合する。このねじ穴511は、バーリング加工を用いて金属板に形成でき、加工が最も簡便であることから多用されている。 FIG. 11 is a diagram schematically showing a screw hole included in a conventional metal plate, and is a vertical cross-sectional view when seen in a cross section including the central axis of the screw hole. In the drawing, a metal plate 510 having a screw hole is shown. However, in order to facilitate understanding of the configuration, a male screw 550 and another metal plate 551 having a through hole 551a are further illustrated with imaginary lines. Show. The metal plate 510 shown in the figure has a cylindrical vertical wall portion 511 that functions as a screw hole (hereinafter, this vertical wall portion 511 may be referred to as a screw hole 511). One end of the vertical wall portion 511 is continuous with the main body 513 of the metal plate, and an internal thread 511b is formed on the inner peripheral surface. When the metal plate 551 having the through hole 551a is attached to the metal plate 510 in an overlapping manner, the male plate 550 is inserted into the through hole 551a and screwed into the screw hole 511 to be coupled. The screw hole 511 is frequently used because it can be formed in a metal plate using burring and is the easiest to process.
 図12A及び図12Bは、従来の金属板におけるねじ穴の加工工程の一例を模式的に示す縦断面図であり、図12Aは穴あけステップを示し、また図12Bはバーリングステップを示す。ねじ穴511の加工にあたり、最初に、加工対象の金属板520に下穴をあける。下穴の穴あけは、せん断加工や切削加工によって行うことができる。せん断加工により下穴をあける場合は、例えば、図12Aに示すような穴あけ用のパンチ531および穴あけ用のダイ532を用いる。パンチ531とダイ532とを相対的に近づけることにより、パンチ531とともに金属板520の一部をダイ532の貫通孔内に押し込む。その結果、パンチ531およびダイ532のそれぞれに設けられた刃により金属板520の一部を切り取って分離させることで、下穴をあける。 FIG. 12A and FIG. 12B are longitudinal sectional views schematically showing an example of a process for forming a screw hole in a conventional metal plate, FIG. 12A shows a drilling step, and FIG. 12B shows a burring step. In processing the screw hole 511, first, a pilot hole is made in the metal plate 520 to be processed. Drilling of the pilot hole can be performed by shearing or cutting. When making a pilot hole by shearing, for example, a punch 531 and a die 532 for drilling as shown in FIG. 12A are used. By bringing the punch 531 and the die 532 relatively close to each other, a part of the metal plate 520 is pushed into the through hole of the die 532 together with the punch 531. As a result, a part of the metal plate 520 is cut out and separated by blades provided on the punch 531 and the die 532, respectively, thereby making a pilot hole.
 下穴があけられた金属板520に、バーリング加工によって縦壁部となる伸びフランジを成形する。バーリング加工には、図12Bに示すように、バーリング用のパンチ533、バーリング用のダイ534およびブランクホルダ539を用いる。バーリング加工では、ダイ534およびブランクホルダ539により金属板520を挟持した状態で、パンチ533と、ダイ534及びブランクホルダ539とを相対的に近づけるように移動させて、パンチ533とともに金属板520の下穴の周辺部分をダイ534の凹部内に押し込む。その結果、金属板520の下穴の周辺部分がパンチ533の押し込み方向に伸ばされながら同時に径方向にも拡大し、その結果、円筒状の伸びフランジ、すなわち、縦壁部511が成形される。 An elongated flange, which becomes a vertical wall portion, is formed on the metal plate 520 with a prepared hole by burring. For burring, as shown in FIG. 12B, a burring punch 533, a burring die 534, and a blank holder 539 are used. In the burring process, with the metal plate 520 sandwiched between the die 534 and the blank holder 539, the punch 533, the die 534 and the blank holder 539 are moved so as to be relatively close to each other, and the punch 533 and the bottom of the metal plate 520 are moved. The peripheral part of the hole is pushed into the recess of the die 534. As a result, the peripheral portion of the prepared hole of the metal plate 520 is expanded in the radial direction while being extended in the pushing direction of the punch 533, and as a result, a cylindrical extending flange, that is, the vertical wall portion 511 is formed.
 このように成形された円筒状の縦壁部511の内周面に例えばタップ(不図視)を用いて雌ねじ511bを加工することにより、ねじ穴511を金属板520に造形できる。 The screw hole 511 can be formed in the metal plate 520 by processing the internal thread 511b using, for example, a tap (not shown) on the inner peripheral surface of the cylindrical vertical wall portion 511 formed in this way.
 金属板のねじ穴について、例えば特許文献1に示すように、従来から種々の提案がなされている。特許文献1に提案される筐体は、その構成部材のうちの第2板金部材にねじ穴が形成されている。第2板金部材のねじ穴は、板金部材の端縁が折り返されて互いに対向配置されるように形成された第1平板部および第2平板部を有している。第2板金部材のねじ穴は、さらに、第1平板部から円筒状に突出するとともに内周面に螺合部を有する第1円筒部と、第2平板部から円筒状に突出するとともに内周面に螺合部を有し、第1円筒部と略直列に並ぶ第2円筒部とを有している。この第2板金部材によれば、雌ねじが第1円筒部および第2円筒部の内周面に螺合部として形成されているので、雄ねじと接触する軸方向の寸法を長くして締め付けトルクを確保できると説明されている。 For example, as disclosed in Patent Document 1, various proposals have been made for screw holes in metal plates. The housing proposed in Patent Document 1 has a screw hole formed in the second sheet metal member among the constituent members. The screw hole of the second sheet metal member has a first flat plate portion and a second flat plate portion that are formed so that the end edges of the sheet metal member are folded and arranged opposite to each other. The screw hole of the second sheet metal member further protrudes in a cylindrical shape from the first flat plate portion and has a threaded portion on the inner peripheral surface, and protrudes in a cylindrical shape from the second flat plate portion and has an inner periphery. The surface has a threaded portion, and has a second cylindrical portion arranged substantially in series with the first cylindrical portion. According to the second sheet metal member, since the female screw is formed as a threaded portion on the inner peripheral surface of the first cylindrical portion and the second cylindrical portion, the axial dimension in contact with the male screw is lengthened to increase the tightening torque. It is explained that it can be secured.
 また、特許文献2には、第1筒状部が形成された第1薄板と、第2筒状部が形成された第2薄板とを、前記第2筒状部内に第1筒状部を同軸に嵌め込むように重ね合わせた後、第2薄板側からタッピングねじを第1筒状部の内周面に螺合させることで、第2薄板を第1薄板に対して締結する構造が開示されている。 Patent Document 2 discloses a first thin plate in which a first cylindrical portion is formed and a second thin plate in which a second cylindrical portion is formed, and the first cylindrical portion is provided in the second cylindrical portion. A structure in which the second thin plate is fastened to the first thin plate by screwing a tapping screw into the inner peripheral surface of the first cylindrical portion from the second thin plate side after being overlapped so as to be fitted coaxially is disclosed. Has been.
日本国特開2011-214802号公報Japanese Unexamined Patent Publication No. 2011-214802 日本国特開2012-241839号公報Japanese Unexamined Patent Publication No. 2012-241839
 図11に示したような従来の金属板510のねじ穴では、バーリング加工により成形された縦壁部(伸びフランジ)511の内周面に雌ねじ511bが形成されている。このようにバーリング加工により造形されたねじ穴511では、家電製品や自動車部品等に用いられる、軽量化が求められる金属板の薄肉化に伴い、雄ねじとの締結力が低下する。また、ねじ穴511の変形によってねじ穴511のねじ山と雄ねじ550のねじ山とが噛み合わない状態、すなわち、ねじ穴511が破損する場合もある。 In the screw hole of the conventional metal plate 510 as shown in FIG. 11, a female screw 511b is formed on the inner peripheral surface of the vertical wall portion (extension flange) 511 formed by burring. Thus, in the screw hole 511 formed by burring, the fastening force with the male screw is reduced as the metal plate used for home appliances, automobile parts, and the like is required to be lighter. In addition, deformation of the screw hole 511 may cause the screw hole 511 and the male screw 550 not to mesh with each other, that is, the screw hole 511 may be damaged.
 また、前述の特許文献1では、ねじ穴として、互いに対向配置された第1平板部および第2平板部を有し、これら第1平板部および第2平板部に、螺合部を有する円筒部をそれぞれ設ける構成が提案されている。この構成によれば、雄ねじと接触する雌ねじの軸方向の寸法を長くして締め付けトルクを確保できると説明されている。このねじ穴を形成する場合、第1平板部に下穴をあけた後でバーリング加工をすることで円筒部を設けるとともに、第2平板部に下穴をあけた後でバーリング加工をすることで円筒部を設け、その後、第2平板部に第1平板部が重なるように折り返し、さらに雌ねじを加工する必要がある。このように、加工に6つのステップを要し、加工数が大幅に増加する。また、第2平板部に第1平板部が重なるように折り返す際、2つの円筒部の中心を互いに一致させる必要があり、高い折り曲げ精度が要求される。これらから、特許文献1に記載のねじ穴を金属板に加工すると、加工コストが大幅に上昇するという問題が有った。 Moreover, in the above-mentioned patent document 1, it has a 1st flat plate part and a 2nd flat plate part which are mutually opposingly arranged as a screw hole, and the cylindrical part which has a screwing part in these 1st flat plate part and 2nd flat plate part. The structure which each provides is proposed. According to this configuration, it is described that a tightening torque can be secured by increasing the axial dimension of the female screw that contacts the male screw. When this screw hole is formed, a burring process is performed after making a pilot hole in the first flat plate part, and a burring process is performed after making a pilot hole in the second flat plate part. It is necessary to provide the cylindrical portion, then turn back so that the first flat plate portion overlaps the second flat plate portion, and further process the female screw. Thus, six steps are required for processing, and the number of processing is greatly increased. Further, when folding back so that the first flat plate portion overlaps the second flat plate portion, the centers of the two cylindrical portions need to coincide with each other, and high bending accuracy is required. From these, when the screw hole described in Patent Document 1 is processed into a metal plate, there is a problem that the processing cost is significantly increased.
 さらに、前述の特許文献2では、その段落番号[0014]に「第1筒状部を半径方向外方に膨らませて第2筒状部に圧接させるので、薄板同士が緩みなくしっかりとネジ部材で固定される」と記載されているように、第1筒状部及び第2筒状部間の遊びを無くし、これにより第1薄板及び第2薄板間の相対的な位置ずれ防止を狙っている。
 この構造では、第2筒状部の内径と第1筒状部の外径との寸法差が大きいと、例え第1筒状部を半径方向外方に膨らませても、十分に第2筒状部に圧接させることができず、その結果として上記の効果が得られない虞がある。よって、十分な締結力を得るためには、上記の寸法差(遊び寸法)をある程度小さくしておくことが望ましいが、今度は、第2筒状部内への第1筒状部の嵌め込み作業が難しくなり、場合によっては、正しく嵌っていないにもかかわらずタッピングネジを誤ってねじ込んでしまう虞もある。そのような場合、当然ながら第1薄板及び第2薄板間を確実に固定することはできない。しかも、この種のねじ穴は、一カ所だけではなく多数設けられるのが一般的であることから、このような作業ミスが起こる確率が低くないことは否めない。したがって、特許文献2の構造でも、十分な締結力を確実に得るという観点からは必ずしも十分ではない。
Further, in the above-mentioned Patent Document 2, the paragraph number [0014] states that “the first cylindrical portion is inflated radially outward and pressed against the second cylindrical portion, so that the thin plates are firmly connected with the screw member without loosening. As described in ‘Fixed’, the play between the first tubular portion and the second tubular portion is eliminated, thereby aiming to prevent relative displacement between the first thin plate and the second thin plate. .
In this structure, if the dimensional difference between the inner diameter of the second cylindrical portion and the outer diameter of the first cylindrical portion is large, the second cylindrical shape can be sufficiently obtained even if the first cylindrical portion is expanded radially outward. As a result, the above-described effects may not be obtained. Therefore, in order to obtain a sufficient fastening force, it is desirable to reduce the above dimensional difference (play dimension) to some extent, but this time, the work of fitting the first cylindrical portion into the second cylindrical portion is performed. In some cases, the tapping screw may be accidentally screwed in even though it is not properly fitted. In such a case, of course, the first thin plate and the second thin plate cannot be reliably fixed. In addition, since it is common to provide a large number of screw holes of this kind, not only one, it is undeniable that the probability of such work mistakes is not low. Therefore, the structure of Patent Document 2 is not always sufficient from the viewpoint of reliably obtaining a sufficient fastening force.
 本発明は、上記事情に鑑みてなされたものであり、加工コストの上昇を低減できるとともに、薄肉化した場合でもねじ穴が雄ねじとの締結力に優れてかつ、ねじ穴の破損を防止できるねじ穴付き金属板と、このねじ穴付き金属板を具備する筐体と、さらにはねじ穴付き金属板の製造方法との提供を目的とする。 The present invention has been made in view of the above circumstances, and is capable of reducing an increase in processing cost, and having a screw hole with excellent fastening force with a male screw even when the thickness is reduced, and capable of preventing the screw hole from being damaged. It aims at providing the metal plate with a hole, the housing | casing which comprises this metal plate with a screw hole, and also the manufacturing method of a metal plate with a screw hole.
 本発明者らは、上記問題を解決するために、図11で説明した従来の金属板が薄肉化することによるねじの締結力低下や破損現象を分析し、下記(a)~(d)の要因を得た。
(a)バーリング加工では、円筒状の縦壁部511の成形に伴って縦壁部511の根元部分が減肉する。なお、「根元部分」とは、図11において二点鎖線で囲んで示すように、縦壁部511の、金属板の本体513と連続する部分511aを意味する。
(b)上記(a)の減肉によって肉厚が薄くなった根元部分までねじ溝を加工することから、肉厚が非常に薄い箇所が発生する。
(c)その肉厚が非常に薄い箇所が弾性変形して締結力が低下する。また、雄ねじ550のねじ込み(締め込み)作業の際に肉厚が非常に薄い箇所に塑性変形が生じ、ねじ穴511が破損する場合や破断に至る場合がある。
(d)雄ねじ550のねじ込み作業や緩め作業等の際に円筒状の縦壁部511が拡径方向に塑性変形し、ねじ穴511のねじ山が雄ねじ550のねじ山と当接する面積が減少する場合がある。この場合、締結力の低下が発生し、ねじ穴511の破損に至る場合もある。
In order to solve the above problem, the present inventors analyzed a decrease in screw fastening force and a phenomenon of breakage caused by thinning of the conventional metal plate described in FIG. 11, and the following (a) to (d): Got the factor.
(A) In the burring process, the base portion of the vertical wall portion 511 is thinned with the formation of the cylindrical vertical wall portion 511. The “root portion” means a portion 511a of the vertical wall portion 511 that is continuous with the metal plate main body 513 as shown by being surrounded by a two-dot chain line in FIG.
(B) Since the thread groove is processed up to the root portion where the thickness is reduced by the thinning of (a), a portion having a very thin thickness is generated.
(C) The part where the wall thickness is very thin is elastically deformed and the fastening force is reduced. Further, when the male screw 550 is screwed (tightened), plastic deformation may occur in a portion where the wall thickness is very thin, and the screw hole 511 may be damaged or may be broken.
(D) When the male screw 550 is screwed or loosened, the cylindrical vertical wall portion 511 is plastically deformed in the diameter increasing direction, and the area where the screw thread of the screw hole 511 contacts the screw thread of the male screw 550 is reduced. There is a case. In this case, the fastening force is reduced, and the screw hole 511 may be damaged.
 これらの現象を踏まえて鋭意検討した結果、本発明者らは、ねじ穴を、金属板から立ち上がる円筒状の外壁部と、その外壁部から内側に折り返されてなる円筒状の内壁部との二重壁として構成し、さらに内壁部の内周面に雌ねじを形成することを想到した。これにより、金属板の板厚を薄くした場合でも、ねじ穴が雄ねじとの締結力に優れるとともに、ねじ穴の破損を防止できる。
 また、本発明者らは、ねじ穴の他の態様として、金属板から立ち上がる円筒状の内壁部と、その内壁部から外側に折り返されてなる円筒状の外壁部との二重壁として構成し、さらに内壁部の内周面に雌ねじを形成する構成でも、ほぼ同様の効果が得られることに想到した。
As a result of diligent examination based on these phenomena, the present inventors have found that the screw hole is divided into a cylindrical outer wall portion rising from a metal plate and a cylindrical inner wall portion folded inward from the outer wall portion. It was conceived that a heavy wall was formed and a female screw was formed on the inner peripheral surface of the inner wall. Thereby, even when the thickness of the metal plate is reduced, the screw hole is excellent in fastening force with the male screw, and damage to the screw hole can be prevented.
In addition, as another aspect of the screw hole, the present inventors configure a double wall of a cylindrical inner wall portion that rises from a metal plate and a cylindrical outer wall portion that is folded outward from the inner wall portion. Further, it has been conceived that substantially the same effect can be obtained even in a configuration in which a female screw is formed on the inner peripheral surface of the inner wall portion.
 本発明は、上記の知見に基づいて完成したものであり、その骨子を以下に示す。 The present invention has been completed based on the above findings, and the outline of the present invention is shown below.
(1)本発明の一態様は、ねじ穴を有する金属板であって、前記ねじ穴が、前記金属板の一方の面から立ち上がる円筒状の外壁部と、前記外壁部の端縁から前記外壁部の内側に折り返された円筒状の内壁部とを備え、前記内壁部の内周面に雌ねじが形成されている、ねじ穴付き金属板である。
(2)上記(1)に記載のねじ穴付き金属板では、前記内壁部の先端と、前記金属板の他方の面とが面一であってもよい。
(3)上記(1)に記載のねじ穴付き金属板において、前記ねじ穴の前記雌ねじに雄ねじが螺合されていない状態では、前記外壁部の内周面より前記内壁部の外周面が離間し、前記ねじ穴の前記雌ねじに前記雄ねじが螺合されている状態では、前記外壁部の前記内周面に前記内壁部の前記外周面の少なくとも一部が当接する、構成を採用してもよい。
(4)上記(3)に記載のねじ穴付き金属板の場合、前記内壁部の先端と、前記金属板の他方の面とが面一であってもよい。
(1) One aspect of the present invention is a metal plate having a screw hole, wherein the screw hole rises from one surface of the metal plate, and the outer wall extends from an edge of the outer wall portion. A metal plate with a screw hole, including a cylindrical inner wall portion folded inside the portion, and an internal thread formed on the inner peripheral surface of the inner wall portion.
(2) In the metal plate with a screw hole described in (1) above, the tip of the inner wall portion and the other surface of the metal plate may be flush with each other.
(3) In the metal plate with a screw hole according to (1), the outer peripheral surface of the inner wall portion is separated from the inner peripheral surface of the outer wall portion in a state where a male screw is not screwed into the female screw of the screw hole. In the state where the male screw is screwed to the female screw of the screw hole, at least a part of the outer peripheral surface of the inner wall portion abuts on the inner peripheral surface of the outer wall portion. Good.
(4) In the case of the metal plate with screw holes according to (3) above, the tip of the inner wall portion and the other surface of the metal plate may be flush with each other.
(5)本発明の他の態様は、ねじ穴を有する金属板であって、前記ねじ穴が、前記金属板の一方の面から立ち上がる円筒状の内壁部と、前記内壁部の端縁から前記内壁部の外側に折り返された円筒状の外壁部とを備え、前記内壁部の内周面に雌ねじが形成されている、ねじ穴付き金属板である。 (5) Another aspect of the present invention is a metal plate having a screw hole, wherein the screw hole rises from one surface of the metal plate, and the edge of the inner wall portion A metal plate with a screw hole, including a cylindrical outer wall portion folded back to the outside of the inner wall portion, and having an internal thread formed on the inner peripheral surface of the inner wall portion.
(6)本発明のさらに他の態様は、ねじ穴を有する金属板と、貫通孔を有する部材と、前記貫通孔に挿入された状態で前記ねじ穴にねじ込まれて前記金属板と前記貫通孔を有する部材とを結合する雄ねじと、を具備する筐体であって、前記金属板が、上記(1)~(5)の何れか一項に記載のねじ穴付き金属板である。 (6) According to still another aspect of the present invention, a metal plate having a screw hole, a member having a through hole, and the metal plate and the through hole screwed into the screw hole in a state of being inserted into the through hole. And a metal plate with a screw hole according to any one of (1) to (5) above.
(7)本発明のさらに他の態様は、上記(1)~(4)の何れか一項に記載のねじ穴付き金属板を製造する方法であって、前記外壁部及び前記外壁部の内側に連続する円板部を前記金属板に成形するステップと、前記円板部の中心に下穴をあけるステップと、前記下穴があけられた前記円板部を、前記外壁部の内側に折り曲げて前記内壁部を成形するステップと、成形された前記内壁部の前記内周面に前記雌ねじを加工するステップとを有する。
(8)上記(7)に記載のねじ穴付き金属板の製造方法では、厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(a)式を満たす半径R(mm)の肩寸法を有するパンチを用いてもよい。
  0.5≦R/t≦1.0   (a)式
(9)上記(7)に記載のねじ穴付き金属板の製造方法では、厚み寸法t(mm)の前記金属板に前記下穴をあけるステップで、前記下穴の半径r(mm)が下式(b)を満たすように前記下穴をあけてもよい。
  0.5≦r/t≦1.2   (b)式
(10)上記(7)に記載のねじ穴付き金属板の製造方法では、厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(a)式を満たす半径R(mm)の肩寸法を有するパンチを用い、前記金属板に前記下穴をあけるステップで、前記下穴の半径r(mm)が下式(b)を満たすように前記下穴をあけてもよい。
  0.5≦R/t≦1.0   (a)式
  0.5≦r/t≦1.2   (b)式
(7) Still another embodiment of the present invention is a method for producing a metal plate with a threaded hole according to any one of (1) to (4) above, wherein the outer wall portion and an inner side of the outer wall portion are provided. Forming a disk part continuous with the metal plate, forming a pilot hole in the center of the disk part, and bending the disk part with the pilot hole inside the outer wall part. Forming the inner wall portion, and processing the female thread on the inner peripheral surface of the molded inner wall portion.
(8) In the manufacturing method of the metal plate with a screw hole according to (7) above, in the step of forming the outer wall portion and the disc portion on the metal plate having a thickness dimension t (mm), the following formula (a) A punch having a shoulder size with a radius R (mm) satisfying the above may be used.
0.5 ≦ R / t ≦ 1.0 (a) Formula (9) In the method of manufacturing a metal plate with screw holes according to (7), the pilot hole is formed on the metal plate having a thickness dimension t (mm). In the drilling step, the pilot hole may be formed so that a radius r (mm) of the pilot hole satisfies the following formula (b).
0.5 ≦ r / t ≦ 1.2 (b) Formula (10) In the method for manufacturing a metal plate with screw holes according to (7), the outer wall portion and the metal plate having a thickness dimension t (mm) are provided. In the step of forming the disc portion, using a punch having a shoulder size of radius R (mm) satisfying the following formula (a), the step of drilling the pilot hole in the metal plate, the radius r ( mm) may be formed so that the following formula (b) is satisfied.
0.5 ≦ R / t ≦ 1.0 (a) Formula 0.5 ≦ r / t ≦ 1.2 (b) Formula
(11)本発明のさらに他の態様は、上記(1)~(4)の何れか一項に記載のねじ穴付き金属板を製造する方法であって、下穴を前記金属板にあける穴あけステップと、前記下穴と同心に、前記外壁部、及び前記外壁部の内側に連続する円板部を成形するステップと、前記円板部を前記外壁部の内側に折り曲げて前記内壁部を成形するステップと、前記内壁部の前記内周面に前記雌ねじを加工するステップと、を有する。
(12)上記(11)に記載のねじ穴付き金属板の製造方法では、厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(a)式を満たす半径R(mm)の肩寸法を有するパンチを用いてもよい。
  0.5≦R/t≦1.0   (a)式
(13)上記(11)に記載のねじ穴付き金属板の製造方法では、厚み寸法t(mm)の前記金属板に前記下穴をあけるステップで、前記円板部を形成するステップ後の前記下穴の半径r(mm)が下式(b)を満たすように、前記下穴をあけてもよい。
  0.5≦r/t≦1.2   (b)式
(14)上記(11)に記載のねじ穴付き金属板の製造方法では、厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(a)式を満たす半径R(mm)の肩寸法を有するパンチを用い、前記金属板に前記下穴をあけるステップで、前記円板部を形成するステップ後の前記下穴の半径r(mm)が下式(b)を満たすように、前記下穴をあける、ようにしてもよい。
  0.5≦R/t≦1.0   (a)式
  0.5≦r/t≦1.2   (b)式
(11) Still another embodiment of the present invention is a method for manufacturing a metal plate with a threaded hole according to any one of the above (1) to (4), wherein a pilot hole is formed in the metal plate. Forming the outer wall part and a disk part continuous to the inside of the outer wall part concentrically with the pilot hole, and forming the inner wall part by bending the disk part to the inside of the outer wall part. And a step of processing the female screw on the inner peripheral surface of the inner wall portion.
(12) In the method of manufacturing a metal plate with a screw hole according to (11) above, in the step of forming the outer wall portion and the disc portion on the metal plate having a thickness dimension t (mm), the following equation (a) A punch having a shoulder size with a radius R (mm) satisfying the above may be used.
0.5 ≦ R / t ≦ 1.0 (a) Formula (13) In the method of manufacturing a metal plate with screw holes according to (11), the pilot hole is formed on the metal plate having a thickness dimension t (mm). In the drilling step, the pilot hole may be formed so that a radius r (mm) of the pilot hole after the step of forming the disc portion satisfies the following formula (b).
0.5 ≦ r / t ≦ 1.2 (b) Formula (14) In the method for manufacturing a metal plate with screw holes according to (11), the outer wall portion and the metal plate having a thickness dimension t (mm) are provided. In the step of forming the disc portion, the disc portion is formed in the step of drilling the pilot hole in the metal plate using a punch having a shoulder size with a radius R (mm) satisfying the following expression (a). You may make it open the said pilot hole so that the radius r (mm) of the said pilot hole after a step may satisfy the following Formula (b).
0.5 ≦ R / t ≦ 1.0 (a) Formula 0.5 ≦ r / t ≦ 1.2 (b) Formula
 上記(1)~(4)に記載の、本発明の一態様に係るねじ穴付き金属板は、外壁部とその外壁部から内側に折り返されてなる内壁部とを有する二重壁構造を備えている。この構成によれば、内壁部の雌ねじに雄ねじを螺合させた際、内壁部が雄ねじによる押圧力を受けて径方向外側に押し広げられようとするが、その周囲にある外壁部により支えられるため、内壁部の過度の変形が規制される。その結果、ねじ穴の破損や、内壁部が過度に拡径することによる締結力の低下を防止できる。
 締結力の観点でさらに言うと、内壁部を外壁部の内側に折り返して成形加工した際に生じるスプリングバック効果により、内壁部には常に縮径方向の弾性力が付与された状態にある。その結果、内壁部の雌ねじに雄ねじをねじ込んだ際に、雄ねじに対して雌ねじが常に押し付けられて密着した状態となるので、緩みの生じない高い締結力を確保できる。
 破損防止の観点でさらに言うと、外壁部には従来有った雌ねじが形成されていないので、この外壁部の根元部分が雌ねじ形成によってさらに薄くなって破損しやすくなるのを防ぐことができる。また、内壁部の根元部分においては、雌ねじが形成されているものの、その周囲が外壁部により覆われた二重壁構造をなしているため、破損しにくい。このように、ねじ穴の2箇所の折り曲げ部分のそれぞれにおいて高い強度を確保出来ているので、破損を防止することが出来る。
 以上説明のように、本態様のねじ穴付き金属板によれば、その板厚を薄くしても、ねじ穴が雄ねじとの締結力に優れるとともにねじ穴の破損を防止できる。
The metal plate with a threaded hole according to one aspect of the present invention described in the above (1) to (4) has a double wall structure having an outer wall portion and an inner wall portion folded inward from the outer wall portion. ing. According to this configuration, when the male screw is screwed into the female screw of the inner wall portion, the inner wall portion is subjected to the pressing force of the male screw and tends to be spread outward in the radial direction, but is supported by the outer wall portion around it. Therefore, excessive deformation of the inner wall portion is restricted. As a result, it is possible to prevent a screw hole from being damaged and a decrease in fastening force due to excessive expansion of the inner wall.
Further in terms of fastening force, the inner wall portion is always in a state of being given elastic force in the direction of diameter reduction due to the springback effect that occurs when the inner wall portion is folded back inside the outer wall portion. As a result, when the male screw is screwed into the female screw of the inner wall portion, the female screw is always pressed against the male screw and comes into close contact with each other, so that a high fastening force without loosening can be secured.
From the viewpoint of preventing breakage, since the conventional female screw is not formed on the outer wall portion, it is possible to prevent the root portion of the outer wall portion from being further thinned and easily damaged by the female screw formation. Moreover, although the internal thread is formed in the base part of an inner wall part, since the circumference | surroundings are comprised with the outer wall part, it has comprised the double wall structure, and is hard to be damaged. Thus, since high intensity | strength is ensured in each of the two bending parts of a screw hole, damage can be prevented.
As described above, according to the metal plate with a screw hole of this aspect, the screw hole is excellent in fastening force with the male screw and can be prevented from being damaged even if the plate thickness is reduced.
 上記(5)に記載の態様に係るねじ穴付き金属板によれば、内壁部とその内壁部から外側に折り返されてなる外壁部とを有する二重壁構造を備えている。この構成によれば、内壁部の雌ねじに雄ねじを螺合させた際、内壁部が雄ねじによる押圧力を受けて径方向外側に押し広げられようとするが、その周囲にある外壁部により支えられるため、内壁部の過度の変形が規制される。その結果、ねじ穴の破損や、内壁部が過度に拡径することによる締結力の低下を防止できる。 According to the metal plate with a screw hole according to the aspect described in (5) above, it has a double wall structure having an inner wall portion and an outer wall portion that is folded outward from the inner wall portion. According to this configuration, when the male screw is screwed into the female screw of the inner wall portion, the inner wall portion is subjected to the pressing force of the male screw and tends to be spread outward in the radial direction, but is supported by the outer wall portion around it. Therefore, excessive deformation of the inner wall portion is restricted. As a result, it is possible to prevent a screw hole from being damaged and a decrease in fastening force due to excessive expansion of the inner wall.
 上記(6)に記載の態様に係る筐体は、上述のねじ穴付き金属板を具備することから、ねじ穴が雄ねじとの締結力に優れるとともにねじ穴の破損を防止できる。よって、ねじ込まれた雄ねじが緩むのを防止できる。 Since the housing according to the aspect described in (6) includes the above-described metal plate with a screw hole, the screw hole has excellent fastening force with a male screw and can prevent the screw hole from being damaged. Therefore, it is possible to prevent the screwed male screw from loosening.
 上記(7)~(14)に記載の態様に係る、ねじ穴付き金属板の製造方法は、上述の通り締結力に優れるとともに破損を防止できるねじ穴を金属板に加工することができる。しかも、加工数及び加工コストの増加を低減できる。 The method for manufacturing a metal plate with a screw hole according to the embodiments described in the above (7) to (14) can process a screw hole that has excellent fastening force and can prevent breakage as described above. In addition, increases in the number of processes and processing costs can be reduced.
本発明の第1実施形態に係るねじ穴付き金属板のねじ穴を模式的に示す図であって、ねじ穴の中心軸を含む断面で見た場合の縦断面図である。It is a figure which shows typically the screw hole of the metal plate with a screw hole which concerns on 1st Embodiment of this invention, Comprising: It is a longitudinal cross-sectional view at the time of seeing in the cross section containing the central axis of a screw hole. 図1のA部の拡大図であって、タッピングねじをねじ込む前の図である。It is an enlarged view of the A section of FIG. 1, and is a figure before screwing in the tapping screw. 図1のA部の拡大図であって、タッピングねじをねじ込んだ後の図である。FIG. 2 is an enlarged view of a portion A in FIG. 1, after a tapping screw is screwed in. 同実施形態に係る筐体を示す分解斜視図である。It is a disassembled perspective view which shows the housing | casing which concerns on the same embodiment. 同実施形態に係るねじ穴付き金属板の製造方法を説明する図であって、加工フロー中の外壁部成形ステップを示す断面図である。It is a figure explaining the manufacturing method of the metal plate with a screw hole concerning the embodiment, Comprising: It is sectional drawing which shows the outer wall part shaping | molding step in a processing flow. 同加工フローの、外壁部成形ステップに続く穴あけステップを示す断面図である。It is sectional drawing which shows the drilling step following the outer wall part shaping | molding step of the same processing flow. 同加工フローの、穴あけステップに続く内壁部成形ステップを示す断面図である。It is sectional drawing which shows the inner wall part formation step following the drilling step of the same processing flow. 同加工フローの、内壁部成形ステップに続く雌ねじ形成ステップを示す断面図である。It is sectional drawing which shows the internal thread formation step following the inner wall part formation step of the same processing flow. 同実施形態に係るねじ穴付き金属板の製造方法の変形例を説明する図であって、加工フロー中の穴あけステップを示す断面図である。It is a figure explaining the modification of the manufacturing method of the metal plate with a screw hole concerning the embodiment, Comprising: It is sectional drawing which shows the drilling step in a processing flow. 同変形例における加工フローの、穴あけステップに続く外壁部成形ステップを示す断面図である。It is sectional drawing which shows the outer wall part shaping | molding step following the drilling step of the processing flow in the modification. 同変形例における加工フローの、外壁部成形ステップに続く内壁部成形ステップを示す断面図である。It is sectional drawing which shows the inner wall part shaping | molding step following the outer wall part shaping | molding step of the processing flow in the modification. 同変形例における加工フローの、内壁部成形ステップに続く雌ねじ形成ステップを示す断面図である。It is sectional drawing which shows the internal thread formation step following the inner wall part shaping | molding step of the processing flow in the modification. 本発明の第2実施形態に係るねじ穴付き金属板のねじ穴を模式的に示す図であって、ねじ穴の中心軸線を含む断面で見た場合の縦断面図である。It is a figure which shows typically the screw hole of the metal plate with a screw hole which concerns on 2nd Embodiment of this invention, Comprising: It is a longitudinal cross-sectional view at the time of seeing in the cross section containing the center axis line of a screw hole. 本発明の第3実施形態に係るねじ穴付き金属板のねじ穴を模式的に示す図であって、ねじ穴の中心軸線を含む断面で見た場合の縦断面図である。It is a figure which shows typically the screw hole of the metal plate with a screw hole which concerns on 3rd Embodiment of this invention, Comprising: It is a longitudinal cross-sectional view at the time of seeing in the cross section containing the center axis line of a screw hole. 本発明の第4実施形態に係るねじ穴付き金属板のねじ穴を模式的に示す図であって、ねじ穴の中心軸線を含む断面で見た場合の縦断面図である。It is a figure which shows typically the screw hole of the metal plate with a screw hole which concerns on 4th Embodiment of this invention, Comprising: It is a longitudinal cross-sectional view at the time of seeing in the cross section containing the center axis line of a screw hole. ねじ穴の締結力を評価する試験における、雄ねじの回転角と締め付けトルクとの関係、および、雄ねじの回転角と締め付けトルクの変化割合との関係を示すグラフである。It is a graph which shows the relationship between the rotation angle of a male screw, and the tightening torque in the test which evaluates the fastening force of a screw hole, and the relationship between the rotation angle of a male screw, and the change rate of a tightening torque. 従来のねじ穴付き金属板のねじ穴を模式的に示す断面図である。It is sectional drawing which shows typically the screw hole of the conventional metal plate with a screw hole. 従来のねじ穴付き金属板の、ねじ穴の加工フローの一例を説明する図であって、同加工フロー中の穴あけステップを示す断面図である。It is a figure explaining an example of the processing flow of the screw hole of the conventional metal plate with a screw hole, Comprising: It is sectional drawing which shows the drilling step in the same processing flow. 同加工フローの、穴あけステップに続くバーリングステップを示す断面図である。It is sectional drawing which shows the burring step following the drilling step of the same processing flow.
 以下に、本発明のねじ穴付き金属板、このねじ穴付き金属板を具備する筐体、および、ねじ穴付き金属板の製造方法、の各実施形態について、図面を参照しながら説明する。なお、本発明のねじ穴付き金属板は、メッキ無しの鋼板とメッキ鋼板のどちらにも適用可能である。 Hereinafter, embodiments of a metal plate with a screw hole of the present invention, a housing including the metal plate with a screw hole, and a manufacturing method of the metal plate with a screw hole will be described with reference to the drawings. In addition, the metal plate with a screw hole of this invention is applicable to both a steel plate without plating and a plated steel plate.
[第1実施形態]
 図1は、本実施形態に係るねじ穴付き金属板10のねじ穴を模式的に示す図であって、ねじ穴の中心軸線CLを含む断面で見た場合の縦断面図である。なお、図1では、構成の理解を容易にするために、ねじ穴付き金属板10に加えて、雄ねじ50と、貫通孔51aを有する金属板51も想像線で示している。
 本実施形態のねじ穴付き金属板10(以下、単に金属板10と呼ぶ場合もある)が有するねじ穴12は、図1に示すように、外壁部12aおよび内壁部12bを備える。外壁部12aは、金属板10の本体10aから略垂直に立ち上がる円筒状をなしている。換言すると、円筒状の外壁部12aは、軸方向の一端である根元部分12a1が本体10aと連続し、その中心軸線CLが本体10aの表面10xに対して垂直である。外壁部12aの、中心軸線CLに沿った方向の他端12a2は、内壁部12bの根元部分12cと連続している。内壁部12bは、外壁部12aと同軸に配置された円筒状をなしており、外壁部12aの上端(前記他端12a2)から内側に折り返されて形成されている。そして、内壁部12bの内周面に、雌ねじ12b1が形成されている。
[First Embodiment]
FIG. 1 is a diagram schematically showing a screw hole of a metal plate 10 with a screw hole according to the present embodiment, and is a longitudinal sectional view when seen in a cross section including a central axis CL of the screw hole. In addition, in order to make an understanding of a structure easy in FIG. 1, in addition to the metal plate 10 with a screw hole, the metal plate 51 which has the external thread 50 and the through-hole 51a is also shown with the imaginary line.
As shown in FIG. 1, the screw hole 12 included in the metal plate 10 with a screw hole of the present embodiment (hereinafter also simply referred to as the metal plate 10) includes an outer wall portion 12a and an inner wall portion 12b. The outer wall portion 12 a has a cylindrical shape that rises substantially vertically from the main body 10 a of the metal plate 10. In other words, in the cylindrical outer wall portion 12a, the base portion 12a1 that is one end in the axial direction is continuous with the main body 10a, and the central axis CL thereof is perpendicular to the surface 10x of the main body 10a. The other end 12a2 of the outer wall portion 12a in the direction along the central axis CL is continuous with the root portion 12c of the inner wall portion 12b. The inner wall portion 12b has a cylindrical shape arranged coaxially with the outer wall portion 12a, and is formed by being folded inward from the upper end (the other end 12a2) of the outer wall portion 12a. And the internal thread 12b1 is formed in the internal peripheral surface of the inner wall part 12b.
 本実施形態のねじ穴付き金属板10のねじ穴12は、その板厚tを薄くした場合でも、内壁部12bの根元部分12cでの減肉を低減でき、ねじ穴12の締結力を向上できるとともにねじ穴12の破損を防止できる。本実施形態のねじ穴付き金属板10で内壁部12bの根元部分12cの減肉を抑えられる理由については、後述する。ここで、「内壁部12bの根元部分12c」とは、図1において一点鎖線で囲んで示すように、外壁部12aの前記他端12a2と連続する部分を意味する。 The screw hole 12 of the metal plate 10 with the screw hole of the present embodiment can reduce the thinning at the root portion 12c of the inner wall portion 12b and improve the fastening force of the screw hole 12 even when the plate thickness t is reduced. At the same time, breakage of the screw hole 12 can be prevented. The reason why the metal plate 10 with the screw hole of the present embodiment can suppress the thinning of the root portion 12c of the inner wall portion 12b will be described later. Here, “the root portion 12c of the inner wall portion 12b” means a portion that is continuous with the other end 12a2 of the outer wall portion 12a as shown by being surrounded by a one-dot chain line in FIG.
 本実施形態のねじ穴付き金属板10が有するねじ穴12は、外壁部12aとその外壁部12aを折り返してなる内壁部12bとを備えた二重壁構造をなしている。これにより、雄ねじ50のねじ込み作業や緩め作業の際に、雄ねじ50からの押圧によって内壁部12bが拡径方向の力を受けても、外壁部12aにより周囲から支持されるので、内壁部12bが過度に拡径方向に変形するのを阻止でき、締結力の低下およびねじ穴12の破損を防止できる。 The screw hole 12 included in the metal plate 10 with the screw hole of the present embodiment has a double wall structure including an outer wall portion 12a and an inner wall portion 12b formed by folding back the outer wall portion 12a. Thus, even when the inner wall portion 12b receives a force in the diameter increasing direction by pressing from the male screw 50 during the screwing operation or loosening operation of the male screw 50, the inner wall portion 12b is supported from the periphery by the outer wall portion 12a. It is possible to prevent excessive deformation in the diameter expansion direction, and it is possible to prevent the fastening force from being lowered and the screw hole 12 from being damaged.
 本実施形態のねじ穴付き金属板10が有するねじ穴12は、後述の製造方法において説明するように、折り曲げ加工時に内壁部12bの外周面が外壁部12aの内周面と接するように成形するが、スプリングバックにより、成形された内壁部12bが縮径方向にわずかに変形している。よって、ねじ穴12の雌ねじ12b1に雄ねじ50が螺合されていない状態では、外壁部12aの内周面より内壁部12bの外周面が離間し、ねじ穴12の雌ねじ12b1に雄ねじ50が螺合されている状態では、外壁部12aの内周面に内壁部12bの外周面の少なくとも一部が当接する構成となっている。この構成について、図2及び図3を用いてさらに詳細に説明する。 The screw hole 12 included in the metal plate 10 with the screw hole according to the present embodiment is formed so that the outer peripheral surface of the inner wall portion 12b is in contact with the inner peripheral surface of the outer wall portion 12a at the time of bending as described in the manufacturing method described later. However, the molded inner wall 12b is slightly deformed in the direction of diameter reduction by the spring back. Therefore, in a state where the male screw 50 is not screwed into the female screw 12b1 of the screw hole 12, the outer peripheral surface of the inner wall portion 12b is separated from the inner peripheral surface of the outer wall portion 12a, and the male screw 50 is screwed into the female screw 12b1 of the screw hole 12. In this state, at least a part of the outer peripheral surface of the inner wall portion 12b is in contact with the inner peripheral surface of the outer wall portion 12a. This configuration will be described in more detail with reference to FIGS.
 まず、図2に示すように、ねじ穴12に雄ねじ50をねじ込む前の状態では、ねじ穴12を折り曲げ加工により形成した後に生じるスプリングバックにより、内壁部12bの先端12b3が外壁部12aの根元部分12a1よりわずかに離間する。よって、内壁部12bの外周面と外壁部12aの内周面との間にわずかな隙間が形成されている。
 続いて、図3に示すように、ねじ穴12に雄ねじ50をねじ込んだ状態では、雄ねじ50による押圧力を受けた内壁部12bが、スプリングバック量に応じて拡径方向に弾性変形し、その結果、内壁部12bの外周面が外壁部12aの内周面に当接して前記隙間が無くなる。そのため、前述の通り、内壁部12bの変形を外壁部12aにより受け止めて規制するが、これに加えて、スプリングバックによって内壁部12bが図2の状態に戻ろうとする復元力を発揮する。この復元力によって、図3の矢印Xに示すように内壁部12bが雄ねじ50に向けて付勢されるため、雌ねじ12b1と雄ねじ50との間が密着し続ける。よって、ねじ穴12及び雄ねじ50間の締結力をより高めて雄ねじ50の緩みを防止することが可能となる。
First, as shown in FIG. 2, in a state before the male screw 50 is screwed into the screw hole 12, the tip 12b3 of the inner wall portion 12b is caused to be the root portion of the outer wall portion 12a by the spring back generated after the screw hole 12 is formed by bending. It is slightly separated from 12a1. Therefore, a slight gap is formed between the outer peripheral surface of the inner wall portion 12b and the inner peripheral surface of the outer wall portion 12a.
Subsequently, as shown in FIG. 3, in the state where the male screw 50 is screwed into the screw hole 12, the inner wall portion 12 b that has received the pressing force by the male screw 50 is elastically deformed in the diameter increasing direction according to the amount of spring back, As a result, the outer peripheral surface of the inner wall portion 12b abuts on the inner peripheral surface of the outer wall portion 12a, and the gap is eliminated. Therefore, as described above, the deformation of the inner wall portion 12b is received and regulated by the outer wall portion 12a. In addition, the inner wall portion 12b exhibits a restoring force to return to the state of FIG. Due to this restoring force, the inner wall portion 12b is urged toward the male screw 50 as shown by an arrow X in FIG. 3, so that the female screw 12b1 and the male screw 50 are kept in close contact with each other. Therefore, the fastening force between the screw hole 12 and the male screw 50 can be further increased to prevent the male screw 50 from loosening.
 以上説明のように、本実施形態のねじ穴付き金属板10は、ねじ穴12が、金属板10の一方の面10xから垂直に立ち上がる円筒状の外壁部12aと、外壁部12aの上端縁から外壁部12aの内側に折り返された円筒状の内壁部12bとを備え、内壁部12bの内周面に雌ねじ12b1が形成されている。
 この構成によれば、ねじ穴付き金属板10の板厚tを薄くしても、ねじ穴12が雄ねじ50との締結力に優れるとともにねじ穴12の破損を防止できる。しかも、ねじ穴12は成形加工で形成された一体物であるので、溶接加工等の手間を必要とせず、加工コストが大幅に増すこともない。
As described above, the screw holed metal plate 10 of the present embodiment includes the cylindrical outer wall portion 12a in which the screw hole 12 rises perpendicularly from one surface 10x of the metal plate 10 and the upper end edge of the outer wall portion 12a. A cylindrical inner wall portion 12b folded inside the outer wall portion 12a, and an internal thread 12b1 is formed on the inner peripheral surface of the inner wall portion 12b.
According to this configuration, even if the thickness t of the metal plate 10 with a screw hole is reduced, the screw hole 12 is excellent in fastening force with the male screw 50 and can be prevented from being damaged. In addition, since the screw hole 12 is a single piece formed by molding, it does not require labor such as welding, and the processing cost does not increase significantly.
また、本実施形態のねじ穴付き金属板10では、内壁部12bの先端12b3と、金属板の他方の面10yとが面一となっている。
 この構成によれば、例えば、このねじ穴付き金属板10の取り付け面となる前記他方の面10yの全面において凹凸の無い平面性が求められる場合に、ねじ穴12の形成による凹凸の度合いを最小限に止めることができるとともに、雌ねじ12b1の長さ寸法を最大に確保出来る。よって、美観と締結力とを兼ね備えたねじ穴付き金属板10を得ることが出来る。
Moreover, in the metal plate 10 with a screw hole of this embodiment, the front-end | tip 12b3 of the inner wall part 12b and the other surface 10y of a metal plate are flush | level.
According to this configuration, for example, when flatness without unevenness is required on the entire surface of the other surface 10y that is the mounting surface of the metal plate 10 with screw holes, the degree of unevenness due to the formation of the screw holes 12 is minimized. It is possible to limit the length of the female screw 12b1 to the maximum. Therefore, the metal plate 10 with a screw hole which has both aesthetics and fastening force can be obtained.
 続いて、本実施形態に係る筐体について、図1及び図4を用いて以下に説明する。
 図4に示すように、本実施形態の筐体70は、前述のねじ穴付き金属板10と、貫通孔51aを有する部材(金属板)51と、貫通孔51aに挿入された状態でねじ穴12にねじ込まれてねじ穴付き金属板10及び部材51間を結合する雄ねじ50とを具備する。なお、図4は分解斜視図であるが、ねじ穴12に雄ねじ50をねじ込むことでねじ穴付き金属板10と部材51とを接合した状態における、ねじ穴12における要部断面図は、図1に示した通りである。
 本実施形態の筐体70によれば、ねじ穴付き金属板10が、上述の構造を備えているため、ねじ穴12と雄ねじ50との締結力に優れるとともに、ねじ穴12の破損防止も可能となっている。また、ねじ込まれた雄ねじ50が緩むことも防止可能な筐体70となっている。なお、筐体70としては、エアコンの室内機や室外機、さらには変電設備の筐体などを例示することができる。
Subsequently, the housing according to the present embodiment will be described below with reference to FIGS. 1 and 4.
As shown in FIG. 4, the housing 70 according to the present embodiment includes the above-described metal plate 10 with screw holes, a member (metal plate) 51 having a through hole 51a, and a screw hole inserted in the through hole 51a. 12 and a male screw 50 that joins between the screw-holed metal plate 10 and the member 51. 4 is an exploded perspective view, but a cross-sectional view of the main part of the screw hole 12 in a state where the metal plate 10 with the screw hole and the member 51 are joined by screwing the male screw 50 into the screw hole 12 is shown in FIG. It is as shown in.
According to the housing 70 of this embodiment, since the metal plate 10 with a screw hole has the above-described structure, the fastening force between the screw hole 12 and the male screw 50 is excellent, and the screw hole 12 can be prevented from being damaged. It has become. Moreover, it is the housing | casing 70 which can also prevent that the screwed male screw 50 loosens. Examples of the casing 70 include an indoor unit and an outdoor unit of an air conditioner, and a casing of a substation facility.
 なお、図1では、貫通孔51aを有する金属板である部材51を内壁部12bの先端12b3側に取り付けているが、この構成のみに限らず、部材51を内壁部12bの根元部分12c側に取り付ける構成も採用できる。すなわち、図1において、ねじ穴付き金属板10と部材51との上下配置関係を逆にしても良い。なお、「内壁部12bの先端12b3」とは、中心軸線CLに沿った方向において、前記根元部分12cと反対に位置する端部を意味する。また、部材51は、金属板のみに限定されず、貫通孔を有する付属部品なども含む。 In FIG. 1, the member 51, which is a metal plate having a through-hole 51a, is attached to the tip 12b3 side of the inner wall portion 12b. However, the present invention is not limited to this configuration. A mounting configuration can also be adopted. That is, in FIG. 1, the vertical arrangement relationship between the metal plate 10 with the screw holes and the member 51 may be reversed. The “tip 12b3 of the inner wall portion 12b” means an end located opposite to the root portion 12c in the direction along the central axis CL. In addition, the member 51 is not limited to a metal plate, and includes an accessory having a through hole.
 続いて、本実施形態のねじ穴付き金属板10の製造方法について説明する。本実施形態では、外壁部成形ステップの後に穴あけステップを行うが、穴あけステップの後に外壁部成形ステップを行う変形例(後述)も採用することができる。 Then, the manufacturing method of the metal plate 10 with a screw hole of this embodiment is demonstrated. In the present embodiment, the hole making step is performed after the outer wall portion forming step, but a modified example (described later) in which the outer wall portion forming step is performed after the hole making step can also be employed.
 図5A~5Dは、本実施形態の金属板の製造方法の加工フローを示す模式図であり、図5Aは外壁部成形ステップ、図5Bは穴あけステップ、図5Cは内壁部成形ステップ、そして図5Dは雌ねじ形成ステップをそれぞれ示す。
 まず、外壁部成形ステップにおいては、加工対象である金属板20(素材)に、外壁部20aと、この外壁部20aに連なる円板部20bとを成形する。円筒状の外壁部20aは、その中心軸線CL方向の一端が金属板20の本体と連続し、その中心軸線CLが金属板20の表面と垂直となるように金属板20から立ち上がる。外壁部20aはその中心軸線CL方向の他端の内側が、円板部20bと連続する。
5A to 5D are schematic diagrams showing a processing flow of the metal plate manufacturing method of the present embodiment, in which FIG. 5A is an outer wall forming step, FIG. 5B is a drilling step, FIG. 5C is an inner wall forming step, and FIG. Indicates the female thread forming step.
First, in the outer wall portion forming step, the outer wall portion 20a and the disc portion 20b connected to the outer wall portion 20a are formed on the metal plate 20 (material) to be processed. The cylindrical outer wall portion 20 a rises from the metal plate 20 such that one end in the direction of the central axis CL is continuous with the main body of the metal plate 20 and the central axis CL is perpendicular to the surface of the metal plate 20. The inner side of the other end in the direction of the central axis CL of the outer wall portion 20a is continuous with the disc portion 20b.
 このような形状の外壁部20aおよび円板部20bは、パンチおよびダイを用いる張り出し加工または絞り加工により、成形できる。張り出し加工の場合は、図5Aに示すように、張り出し用パンチ35および張り出し用ダイ36に加え、さらにブランクホルダ36aを用いる。ブランクホルダ36aとダイ36とで金属板20をその表裏面より挟持した状態で、パンチ35と、ダイ36及びブランクホルダ36aとを相対的に移動させて、パンチ35とともに金属板20の一部をダイ36内に押し込む。これにより、円筒状の外壁部20aと円板部20bとが金属板20に成形される。 The outer wall portion 20a and the disc portion 20b having such a shape can be formed by overhanging or drawing using a punch and a die. In the case of overhanging, as shown in FIG. 5A, in addition to the overhanging punch 35 and the overhanging die 36, a blank holder 36a is further used. With the metal plate 20 held between the front and back surfaces of the blank holder 36 a and the die 36, the punch 35, the die 36 and the blank holder 36 a are moved relative to each other, and a part of the metal plate 20 is moved together with the punch 35. Push into the die 36. Thereby, the cylindrical outer wall portion 20a and the disc portion 20b are formed on the metal plate 20.
 続く穴あけステップにおいては、円板部20bの中心に下穴をあける。すなわち、図5Bに示すように、せん断加工による穴あけを穴あけ用パンチ31および穴あけ用ダイ32を用いて行うことにより、円板部20bに下穴20b1をあける。穴あけは、ドリルを用いる切削加工やレーザー切断機による穴あけ加工により行うこともできる。 In the subsequent drilling step, a pilot hole is drilled in the center of the disc portion 20b. That is, as shown in FIG. 5B, the pilot hole 20b1 is formed in the disc portion 20b by performing drilling by shearing using the punch 31 for punching and the die 32 for drilling. Drilling can also be performed by cutting using a drill or drilling with a laser cutting machine.
 続く内壁部成形ステップにおいては、下穴20b1があけられた円板部20bを折り曲げることにより、外壁部20a(12a)の内側に折り返してなる内壁部12bを成形する。この円板部20bの折り曲げは、いわゆる穴広げ加工により行うことができる。 In the subsequent inner wall portion forming step, the inner wall portion 12b is formed by folding the disk portion 20b having the prepared hole 20b1 and folding it inside the outer wall portion 20a (12a). The disk portion 20b can be bent by a so-called hole expanding process.
 すなわち、穴広げ加工においては、図5Cに示すような穴広げ用パンチ37、穴広げ用ダイ38およびブランクホルダ39を用いて行うことができる。すなわち、ダイ38およびブランクホルダ39で金属板20をその表裏面より挟持した状態で、パンチ37と、ダイ38及びブランクホルダ39とを相対的に移動させる。その際、パンチ37を下穴20b1内に押し当てるようにする。このようにして、パンチ37とともに金属板20の円板部20bを外壁部20aの内側に押し込むと、円板部20bがパンチ37の押し込み方向に伸ばされながら径方向にも拡大し、その結果、円筒状であって、外壁部12a(20a)から内側に折り返してなる内壁部12b(20b)が形成される。この際、内壁部12bの外周面が外壁部12aの内周面に接するように形成されるが、スプリングバックにより内壁部12bが縮径方向にわずかに変形するため、図2に示したような隙間が発生する。 That is, the hole expanding process can be performed using a hole expanding punch 37, a hole expanding die 38 and a blank holder 39 as shown in FIG. 5C. That is, with the die 38 and the blank holder 39 sandwiching the metal plate 20 from the front and back surfaces, the punch 37 and the die 38 and the blank holder 39 are relatively moved. At that time, the punch 37 is pressed into the pilot hole 20b1. Thus, when the disc portion 20b of the metal plate 20 is pushed into the outer wall portion 20a together with the punch 37, the disc portion 20b is expanded in the radial direction while being stretched in the pushing direction of the punch 37. An inner wall portion 12b (20b) that is cylindrical and is folded inward from the outer wall portion 12a (20a) is formed. At this time, the outer peripheral surface of the inner wall portion 12b is formed so as to be in contact with the inner peripheral surface of the outer wall portion 12a. However, since the inner wall portion 12b is slightly deformed in the diameter reducing direction by the spring back, as shown in FIG. A gap occurs.
 続くねじ切りステップにおいては、形成された内壁部12bの内周面に雌ねじ12b1を加工する。雌ねじ12b1の加工方法に特に制限はなく、例えば図5Dに示すように、タップ40により雌ねじ12b1を加工することができる。以上説明のように、本実施形態の製造方法によれば、ねじ穴付き金属板10、すなわち、外壁部12aおよびその外壁部12aの一部を折り返した内壁部12bを備えるねじ穴12を、金属板20に加工することができる。 In the subsequent thread cutting step, the internal thread 12b1 is processed on the inner peripheral surface of the formed inner wall 12b. There is no restriction | limiting in particular in the processing method of the internal thread 12b1, For example, as shown to FIG. 5D, the internal thread 12b1 can be processed with the tap 40. FIG. As described above, according to the manufacturing method of the present embodiment, the metal plate 10 with a screw hole, that is, the screw hole 12 including the outer wall portion 12a and the inner wall portion 12b obtained by folding back a part of the outer wall portion 12a, The plate 20 can be processed.
 本実施形態の製造方法によれば、図11を用いて説明したような、バーリング加工を用いてねじ穴を形成する従来の方法と比べて、ねじ穴の根元部分における減肉を低減できる。すなわち、従来の製造方法では、図12Bに示したように、バーリング加工の際、ダイ534とブランクホルダ539とで金属板520を挟持した状態で、パンチ533とともに、金属板520の下穴周辺部分をダイ534の凹部内に押し込んで変形させることにより、縦壁部511を成形する。その際、金属板520のうち、変形する下穴周辺の根元部分511aと、ダイ534及びブランクホルダ539で挟持される部分とが近接していることから、縦壁部511の根元に非常に大きな引張応力が生じ、その結果、減肉が促進される。 According to the manufacturing method of the present embodiment, it is possible to reduce the thinning at the root portion of the screw hole as compared with the conventional method of forming the screw hole using burring as described with reference to FIG. That is, in the conventional manufacturing method, as shown in FIG. 12B, in the state of holding the metal plate 520 between the die 534 and the blank holder 539 during the burring process, together with the punch 533, the peripheral portion of the metal plate 520 Is pushed into the recess of the die 534 and deformed to form the vertical wall portion 511. At that time, in the metal plate 520, the base portion 511 a around the deformed pilot hole and the portion sandwiched between the die 534 and the blank holder 539 are close to each other, so that the base portion of the vertical wall portion 511 is very large. Tensile stress is generated and, as a result, thinning is promoted.
 一方、本実施形態は、図5Cに示したように内壁部成形ステップでダイ38とブランクホルダ39とにより金属板20を挟持した状態で、パンチ37とともに円板部20bを外壁部20a(12a)の内側に押し込んで変形させることにより内壁部12bを成形する。その際、金属板20のうち、変形する円板部20bと、ダイ38及びブランクホルダ39間に挟持される部分との間に、外壁部12aが介在する。これにより、内壁部12bの根元部分12cに生じる引張応力が緩和され、その結果、根元部分12cにおける減肉量を、従来の前記根元部分511a(図11参照)よりも低減できる。 On the other hand, in the present embodiment, as shown in FIG. 5C, the circular plate portion 20b and the outer wall portion 20a (12a) together with the punch 37 are sandwiched between the die 38 and the blank holder 39 in the inner wall portion forming step. The inner wall portion 12b is formed by being pushed and deformed inside. At that time, the outer wall portion 12 a is interposed between the deformed disc portion 20 b and the portion sandwiched between the die 38 and the blank holder 39 in the metal plate 20. Thereby, the tensile stress which arises in the root part 12c of the inner wall part 12b is relieve | moderated, As a result, the thinning amount in the root part 12c can be reduced rather than the said conventional root part 511a (refer FIG. 11).
 したがって、本実施形態の製造方法によれば、形成されたねじ穴12と雄ねじ50との締結力を向上できるとともに、ねじ穴12の破損をも防止できる。また、ねじ穴12が、外壁部12aと内壁部12bとの二重壁構造であるので、内壁部12bが拡径方向に変形するのを阻止でき、変形による締結力の低下およびねじ穴12の破損を防止できる。さらに、円板部20bを折り曲げて内壁部12bを形成するので、ねじ穴12に雄ねじ50をねじ込むと、内壁部12bのスプリングバックによる復元力が発生し、内壁部12bが雄ねじ50に密着する。これにより、ねじ穴12の締結力がさらに向上するとともに、ねじ込まれた雄ねじ50が緩むのをより確実に防止できる。 Therefore, according to the manufacturing method of the present embodiment, the fastening force between the formed screw hole 12 and the male screw 50 can be improved, and damage to the screw hole 12 can be prevented. Further, since the screw hole 12 has a double wall structure of the outer wall portion 12a and the inner wall portion 12b, the inner wall portion 12b can be prevented from being deformed in the diameter increasing direction, and the fastening force is reduced by deformation and the screw hole 12 Damage can be prevented. Further, since the disk portion 20 b is bent to form the inner wall portion 12 b, when the male screw 50 is screwed into the screw hole 12, a restoring force is generated by the spring back of the inner wall portion 12 b, and the inner wall portion 12 b comes into close contact with the male screw 50. As a result, the fastening force of the screw hole 12 is further improved, and the screwed male screw 50 can be more reliably prevented from loosening.
 本実施形態は、外壁部成形、穴あけ、内壁部成形および雌ねじ形成の4つのステップでねじ穴12を形成することができるので、前述の特許文献1に提案される従来のねじ穴と比べて、加工工数の増加を低減できる。また、上述の4つのステップでは、高い加工精度が要求されない。したがって、本実施形態の製造方法によれば、前述の特許文献1に提案されるねじ穴と比べ、加工コストの上昇を低減できる。 In the present embodiment, the screw hole 12 can be formed by four steps of outer wall forming, drilling, inner wall forming, and female screw forming. Therefore, compared with the conventional screw hole proposed in Patent Document 1 described above, Increase in processing man-hours can be reduced. In the above four steps, high machining accuracy is not required. Therefore, according to the manufacturing method of the present embodiment, an increase in processing cost can be reduced as compared with the screw hole proposed in Patent Document 1 described above.
 本発明のねじ穴付き金属板の製造方法としては、上記説明以外の形態として、例えば図6A~6Dに示す変形例も採用することができる。
 図6Aは穴あけステップ、図6Bは外壁部成形ステップ、図6Cは内壁部成形ステップ、図6Dは雌ねじ形成ステップをそれぞれ示す。本変形例では、ねじ穴12の形成にあたり、最初に穴あけステップにおいて下穴をあける。すなわち、図6Aに示すように、穴あけ用パンチ31および穴あけ用ダイ32を用いてせん断加工による穴あけを行い、加工対象の金属板20に下穴20b1をあける。穴あけは、ドリルを用いる切削加工やレーザー切断機による穴あけ加工により行うこともできる。
As a method of manufacturing the metal plate with screw holes of the present invention, for example, the modifications shown in FIGS. 6A to 6D can be adopted as forms other than the above description.
6A shows a drilling step, FIG. 6B shows an outer wall forming step, FIG. 6C shows an inner wall forming step, and FIG. 6D shows an internal thread forming step. In this modification, when the screw hole 12 is formed, a pilot hole is first drilled in the drilling step. That is, as shown in FIG. 6A, drilling is performed by shearing using a punch 31 for punching and a die 32 for drilling, and a pilot hole 20b1 is made in the metal plate 20 to be processed. Drilling can also be performed by cutting using a drill or drilling with a laser cutting machine.
 続く外壁部成形ステップでは、図6Bに示すように、円筒状の外壁部20aと、この外壁部20aに連続する円板部20bとを金属板20に成形する。円筒状の外壁部20aは、その軸方向の一端である根元部分が金属板20と連続し、その中心軸線CLが金属板20の表面と垂直となるように金属板20から立ち上がる。また、外壁部20aは、その中心軸線CLに沿った方向の他端の内側が円板部20bと連続する。このような外壁部20aと円板部20bとを、本変形例では、下穴20b1と円筒状の外壁部20aとが同心となるように成形する。 In the subsequent outer wall portion forming step, as shown in FIG. 6B, a cylindrical outer wall portion 20a and a disc portion 20b continuous with the outer wall portion 20a are formed on the metal plate 20. The cylindrical outer wall portion 20 a rises from the metal plate 20 so that the base portion, which is one end in the axial direction, is continuous with the metal plate 20 and the center axis CL is perpendicular to the surface of the metal plate 20. Moreover, the inner side of the other end of the outer wall part 20a in the direction along the center axis line CL is continuous with the disk part 20b. In this modification, the outer wall portion 20a and the disc portion 20b are formed such that the pilot hole 20b1 and the cylindrical outer wall portion 20a are concentric.
 外壁部20aおよび円板部20bの成形は、パンチおよびダイを用いた張り出し加工または絞り加工により成形できる。張り出し加工の場合は、図6Bに示す張り出し用パンチ35および張り出し用ダイ36に加え、さらにブランクホルダ36aを用いる。金属板20をその下穴20b1の中心とダイ36の凹部の中心とが一致するように配置し、金属板20をダイ36とブランクホルダ36aとで挟持する。その状態で、パンチ35と、ダイ36及びブランクホルダ36aとを相対的に移動させて、パンチ35とともに金属板20の一部をダイ36内に押し込む。これにより、円筒状の外壁部20aと円板部20bとが金属板20に成形される。その際、下穴20b1が変形して拡径する。 The outer wall portion 20a and the disk portion 20b can be formed by overhanging or drawing using a punch and a die. In the case of the overhanging process, a blank holder 36a is used in addition to the overhanging punch 35 and the overhanging die 36 shown in FIG. 6B. The metal plate 20 is disposed so that the center of the pilot hole 20b1 coincides with the center of the recess of the die 36, and the metal plate 20 is sandwiched between the die 36 and the blank holder 36a. In this state, the punch 35, the die 36, and the blank holder 36a are relatively moved, and a part of the metal plate 20 is pushed into the die 36 together with the punch 35. Thereby, the cylindrical outer wall portion 20a and the disc portion 20b are formed on the metal plate 20. At that time, the pilot hole 20b1 is deformed and expanded in diameter.
 続く内壁部成形ステップでは、図6Cに示すように、成形された円板部20bを折り曲げることにより、外壁部12aから内側に折り返してなる内壁部12bを成形する。
 続く雌ねじ形成ステップでは、図6Dに示すように、内壁部12bの内周面に雌ねじ12b1を加工する。円板部20bの折り曲げは、前述の実施形態と同様に穴広げ加工により行うことができる。また、雌ねじ12b1の加工も、前述の実施形態と同様に特に制限はなく、例えば、タップ40により加工することができる。
In the subsequent inner wall portion forming step, as shown in FIG. 6C, the inner disk portion 12b is formed by folding the formed disc portion 20b inward from the outer wall portion 12a.
In the subsequent female screw forming step, as shown in FIG. 6D, the female screw 12b1 is processed on the inner peripheral surface of the inner wall portion 12b. The bending of the disc portion 20b can be performed by hole expansion processing as in the above-described embodiment. Further, the processing of the female screw 12b1 is not particularly limited as in the above-described embodiment, and can be processed by the tap 40, for example.
 上記変形例の製造方法によっても、外壁部12a及び内壁部12bを備えたねじ穴12を金属板20に形成できる。また、本変形例においても、内壁部成形ステップで円板部20bを折り曲げる際、金属板20のうち、変形する円板部20bと、ダイ38及びブランクホルダ39で挟持される部分との間に、外壁部12aが介在する。このため、内壁部12bの根元部分12cの減肉を低減でき、その結果、ねじ穴12の締結力を向上できるとともにねじ穴12の破損を防止できる。 The screw hole 12 provided with the outer wall portion 12a and the inner wall portion 12b can be formed in the metal plate 20 also by the manufacturing method of the above modification. Also in this modified example, when the disk part 20b is bent in the inner wall part forming step, between the disk part 20b to be deformed and the part sandwiched between the die 38 and the blank holder 39 in the metal plate 20. The outer wall 12a is interposed. For this reason, the thickness reduction of the root portion 12c of the inner wall portion 12b can be reduced. As a result, the fastening force of the screw hole 12 can be improved and the screw hole 12 can be prevented from being damaged.
 また、本変形例においても、上記実施形態と同様に、得られるねじ穴12は、外壁部12aと内壁部12bとを有する二重壁構造であるので、内壁部12bが拡径方向に過度に変形するのを阻止でき、それによる締結力の低下およびねじ穴12の破損を防止できる。さらに、ねじ穴12に雄ねじ50をねじ込むと、スプリングバックにより内壁部12bが雄ねじ50に密着する。これにより、ねじ穴12の締結力がさらに向上するとともに、ねじ込まれた雄ねじ50が緩むのを防止できる。 Also in the present modification, as in the above-described embodiment, the obtained screw hole 12 has a double wall structure having the outer wall portion 12a and the inner wall portion 12b. Therefore, the inner wall portion 12b is excessively increased in the diameter increasing direction. It is possible to prevent the deformation, thereby preventing the fastening force from being lowered and the screw hole 12 from being damaged. Further, when the male screw 50 is screwed into the screw hole 12, the inner wall portion 12b is brought into close contact with the male screw 50 by the spring back. Thereby, the fastening force of the screw hole 12 can be further improved, and the screwed male screw 50 can be prevented from loosening.
 本変形例は、穴あけ、外壁部成形、内壁部成形および雌ねじ形成の4つのステップでねじ穴12を造形できるので、前述の特許文献1に提案される従来のねじ穴と比べ、加工数の増加を抑えることができる。また、上述の4つのステップに高い加工精度が要求されない。したがって、本変形例は、前述の特許文献1に提案されるねじ穴と比べて、加工コストの上昇を低減できる。 In this modification, since the screw hole 12 can be formed by four steps of drilling, outer wall forming, inner wall forming, and female screw forming, the number of processing is increased compared to the conventional screw hole proposed in Patent Document 1 described above. Can be suppressed. In addition, high processing accuracy is not required for the above four steps. Therefore, this modification can reduce an increase in processing cost as compared with the screw hole proposed in Patent Document 1 described above.
 本変形例は、外壁部成形および内壁部成形のステップを同じ装置で行うこともでき、この場合は加工数の増加をより抑えることができる。具体的には、図6Bにおいて、張り出し用パンチ35と対向するように、図6Cで示した穴広げ用パンチ37(図示略)を配置する。これにより、張り出し用パンチ35および張り出し用ダイ36で外壁部20a(12a)と円板部20bとを成形した後、即座に穴広げ用パンチ37で内壁部12bを成形することができる。 In this modification, the steps of forming the outer wall portion and the inner wall portion can be performed with the same apparatus, and in this case, the increase in the number of processing can be further suppressed. Specifically, in FIG. 6B, the hole expanding punch 37 (not shown) shown in FIG. 6C is arranged so as to face the overhanging punch 35. Thus, after forming the outer wall portion 20a (12a) and the disc portion 20b with the overhanging punch 35 and the overhanging die 36, the inner wall portion 12b can be immediately formed with the hole expanding punch 37.
 以上説明の第1実施形態およびその変形例ともに、外壁部成形ステップ(図5A,図6B参照)において外壁部20a(12a)および円板部20bを成形する際に、ダイ36、および、肩の半径R(mm)が下記(1)式を満足するパンチ35を用いることが好ましい。また、穴あけステップ(図5B,図6A参照)においては、その後の内壁部成形ステップにおける内壁部成形前の下穴の半径r(mm)が下記(2)式を満足するように下穴をあけるのが好ましい。なお、tは金属板20の板厚(mm)を示す。
  0.5≦R/t≦1.0   (1)式
  0.5≦r/t≦1.2   (2)式
In both the first embodiment described above and the modifications thereof, when forming the outer wall portion 20a (12a) and the disc portion 20b in the outer wall portion forming step (see FIGS. 5A and 6B), the die 36 and the shoulder It is preferable to use a punch 35 whose radius R (mm) satisfies the following expression (1). Also, in the drilling step (see FIGS. 5B and 6A), the pilot hole is drilled so that the radius r (mm) of the pilot hole before the inner wall portion molding in the subsequent inner wall portion molding step satisfies the following expression (2). Is preferred. Here, t represents the thickness (mm) of the metal plate 20.
0.5 ≦ R / t ≦ 1.0 (1) Formula 0.5 ≦ r / t ≦ 1.2 (2) Formula
 ここで、パンチ35の「肩の半径」とは、金属板20に成形される外壁部20a(12a)と当接するパンチ35の外周面と、成形される円板部20bと当接するパンチ35の先端面とを繋ぐR部の半径を意味する(図5Aおよび図6B参照)。また、「内壁部成形ステップにおける内壁部成形前の下穴の半径」とは、具体的には、上記実施形態では図5Bで示した穴あけステップであけられた下穴20b1の半径が該当し、上記変形例では穴あけステップ後の図6Bに示した外壁部成形ステップで拡径方向に変形した状態の下穴20b1の半径が該当する。 Here, the “shoulder radius” of the punch 35 refers to the outer peripheral surface of the punch 35 that contacts the outer wall portion 20a (12a) formed on the metal plate 20 and the punch 35 that contacts the formed disk portion 20b. This means the radius of the R portion connecting the tip surface (see FIGS. 5A and 6B). In addition, the “radius of the pilot hole before the inner wall part molding in the inner wall part molding step” specifically corresponds to the radius of the pilot hole 20b1 drilled in the drilling step shown in FIG. 5B in the above embodiment, In the modified example, the radius of the prepared hole 20b1 in the state of being deformed in the diameter increasing direction in the outer wall portion forming step shown in FIG. 6B after the drilling step is applicable.
 外壁部成形ステップでパンチ35の肩の半径R(mm)が0.5×t(mm)より小さいと、パンチ35が外壁部20a(12a)と円板部20bとを繋ぐR部(曲がり部分)に食い込み、この部分が減肉して破断に至る現象により製品不良となる場合があり、製造歩留りが低下する。一方、パンチ35の肩の半径R(mm)が1.0×t(mm)より大きいと、内壁部成形ステップで外壁部20a(12a)と円板部20bとを繋ぐR部(曲がり部分)で十分に折れ曲がらず、外壁部20a(12a)が内壁部12b側に倒れ込む結果、やはり製品不良となるおそれがある。 If the shoulder radius R (mm) of the punch 35 is smaller than 0.5 × t (mm) in the outer wall forming step, the punch 35 connects the outer wall portion 20a (12a) and the disc portion 20b to the R portion (curved portion). ), And this part may be thinned and lead to breakage, resulting in a product failure, and the production yield is reduced. On the other hand, when the radius R (mm) of the shoulder of the punch 35 is larger than 1.0 × t (mm), an R portion (curved portion) connecting the outer wall portion 20a (12a) and the disc portion 20b in the inner wall portion forming step. As a result, the outer wall portion 20a (12a) falls to the inner wall portion 12b side, and as a result, the product may be defective.
 また、下穴20b1の半径r(mm)が0.5×t(mm)より小さいと、内壁部成形ステップで円板部20bを折り曲げる際に、下穴20b1の周辺部分を変形させるのに要する力が過大となる。これにより、外壁部20a(12a)と金属板20の本体を繋ぐR部(曲がり部分)が変形し、その結果、内壁部12bおよび外壁部20a(12a)を成形できずに製品不良となる場合があり、製造歩留りが低下する。一方、下穴の半径r(mm)が1.2×t(mm)より大きいと、内壁部成形ステップによって成形された内壁部12bは、その高さが小さく、ねじ山の数が少なくなる。このため、雄ねじ50との十分な締結力が得られないおそれがある。 If the radius r (mm) of the pilot hole 20b1 is smaller than 0.5 × t (mm), it is necessary to deform the peripheral part of the pilot hole 20b1 when the disk part 20b is bent in the inner wall part forming step. Power is excessive. Thereby, the R portion (curved portion) connecting the outer wall portion 20a (12a) and the main body of the metal plate 20 is deformed, and as a result, the inner wall portion 12b and the outer wall portion 20a (12a) cannot be formed, resulting in a product defect. There is a decrease in manufacturing yield. On the other hand, when the radius r (mm) of the pilot hole is larger than 1.2 × t (mm), the inner wall portion 12b formed by the inner wall portion forming step has a small height and a small number of threads. For this reason, there exists a possibility that sufficient fastening force with the external thread 50 cannot be obtained.
 本発明のねじ穴付き金属板、それを具備する筐体、および、ねじ穴付き金属板の製造方法において、金属板自体の材質について特に制限はない。 There is no particular limitation on the material of the metal plate itself in the manufacturing method of the metal plate with a screw hole, the housing having the same, and the metal plate with a screw hole of the present invention.
 本発明のねじ穴付き金属板の製造方法は、内壁部成形ステップで、図5Cおよび図6Cに示したような先端にテーパー部が設けられたパンチ37を用いるのが好ましい。その理由は、従来技術の説明において図12Bに示したようなストレート形状のバーリング用パンチ533と比べ、先端に近づくに伴って外径が小さくなるようなテーパー部が設けられたパンチ37を用いれば、外壁部20a(12a)と円板部20bとを繋ぐR部(曲げ部)での曲げ変形を促進しやすく、外壁部20a(12a)の倒れ込みを抑制できるからである。 In the manufacturing method of the metal plate with screw holes of the present invention, it is preferable to use the punch 37 having a tapered portion at the tip as shown in FIGS. 5C and 6C in the inner wall forming step. The reason for this is that if a punch 37 provided with a tapered portion whose outer diameter decreases as it approaches the tip as compared with the straight-shaped burring punch 533 shown in FIG. This is because it is easy to promote bending deformation at the R portion (bending portion) connecting the outer wall portion 20a (12a) and the disc portion 20b, and the falling of the outer wall portion 20a (12a) can be suppressed.
[第2実施形態]
 以下、本発明の第2実施形態について図7を用いて説明する。説明に際しては、上記第1実施形態との相違点を中心に説明し、その他については上記第1実施形態と同じであるとして説明を省略する。
 図7は、本実施形態に係るねじ穴付き金属板100のねじ穴12を模式的に示す図であって、ねじ穴12の中心軸線CLを含む断面で見た場合の、図3に相当する縦断面図である。
[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In the description, the difference from the first embodiment will be mainly described, and the rest will be omitted because it is the same as the first embodiment.
FIG. 7 is a diagram schematically illustrating the screw hole 12 of the metal plate 100 with the screw hole according to the present embodiment, and corresponds to FIG. 3 when viewed in a cross section including the central axis CL of the screw hole 12. It is a longitudinal cross-sectional view.
 本実施形態のねじ穴付き金属板100は、その内壁部12bの長さ寸法L1が上記第1実施形態のものより長くなっている。その結果、内壁部12bの先端12b3が、金属板の前記他方の面10yよりも突出している。
 この構成によれば、例えば、ねじ穴付き金属板100と他の金属板51とを重ねて位置合わせを行う際に、図7に示すように、内壁部12bの突出部分を他の金属板51の貫通孔51a内に嵌め込むことで、容易に位置合わせを行うことができる。
 また、雌ねじ12b1の長さ寸法も上記第1実施形態のものより長くできるので、雄ねじ50と螺合する部分の長さを長くして締結をより確実に行うこともできる。
As for the metal plate 100 with a screw hole of this embodiment, the length dimension L1 of the inner wall part 12b is longer than the thing of the said 1st Embodiment. As a result, the front end 12b3 of the inner wall portion 12b protrudes from the other surface 10y of the metal plate.
According to this configuration, for example, when the metal plate 100 with a screw hole and another metal plate 51 are overlapped and aligned, as shown in FIG. 7, the protruding portion of the inner wall portion 12 b is replaced with the other metal plate 51. By being fitted into the through hole 51a, the alignment can be easily performed.
Further, since the length dimension of the female screw 12b1 can be made longer than that of the first embodiment, the length of the portion screwed with the male screw 50 can be made longer and fastening can be performed more reliably.
[第3実施形態]
 以下、本発明の第3実施形態について図8を用いて説明する。説明に際しては、上記第1実施形態との相違点を中心に説明し、その他については上記第1実施形態と同じであるとして説明を省略する。
 図8は、本実施形態に係るねじ穴付き金属板110のねじ穴12を模式的に示す図であって、ねじ穴12の中心軸線CLを含む断面で見た場合の、図3に相当する縦断面図である。
[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. In the description, the difference from the first embodiment will be mainly described, and the rest will be omitted because it is the same as the first embodiment.
FIG. 8 is a diagram schematically showing the screw hole 12 of the metal plate 110 with the screw hole according to the present embodiment, and corresponds to FIG. 3 when viewed in a cross section including the central axis CL of the screw hole 12. It is a longitudinal cross-sectional view.
 本実施形態のねじ穴付き金属板10は、その内壁部12bの長さ寸法L2が上記第1実施形態のものよりも短くなっている。その結果、内壁部12bの先端12b3が、金属板の前記他方の面10yよりも奥の位置にある。そのため、ねじ止めの際には、他の金属板51の表面との間にわずかな隙間が生じることとなる。
 この構成によれば、例えば、ねじ穴付き金属板10と他の金属板51とを重ね合わせてから雄ねじ50でねじ止めした場合、内壁部12bが上記第1実施形態の場合よりも短いため、雄ねじ50と螺合する部分の長さは短くなる。しかしながら、前記隙間が有るため、雄ねじ50を締め込んだ際に、内壁部12bをその先端12b3が雄ねじ50のねじ頭により近づこうとするのが許容される。そして、雄ねじ50の締め込みと共に雄ねじ50が内壁部12bを自らに向かって引き込もうとし、その結果、円筒状の内壁部12bが縮径しようとする。これにより、内壁部12bがより密に雄ねじ50に対して密着することになり、高い締結力を確保することが可能となる。
As for the metal plate 10 with a screw hole of this embodiment, the length dimension L2 of the inner wall part 12b is shorter than the thing of the said 1st Embodiment. As a result, the front end 12b3 of the inner wall portion 12b is at a position deeper than the other surface 10y of the metal plate. Therefore, when screwing, a slight gap is generated between the surfaces of the other metal plates 51.
According to this configuration, for example, when the metal plate 10 with screw holes and the other metal plate 51 are overlapped and then screwed with the male screw 50, the inner wall portion 12b is shorter than in the case of the first embodiment. The length of the portion screwed with the male screw 50 is shortened. However, since there is the gap, when the male screw 50 is tightened, the inner wall portion 12b is allowed to have its tip 12b3 approaching the screw head of the male screw 50. Then, when the male screw 50 is tightened, the male screw 50 tries to draw the inner wall portion 12b toward itself, and as a result, the cylindrical inner wall portion 12b attempts to reduce the diameter. As a result, the inner wall portion 12b is more closely attached to the male screw 50, and a high fastening force can be ensured.
[第4実施形態]
 以下、本発明の第4実施形態について図9を用いて説明する。説明に際しては、上記第1実施形態との相違点を中心に説明し、その他については上記第1実施形態と同じであるとして説明を省略する。
 図9は、本実施形態に係るねじ穴付き金属板200のねじ穴212を模式的に示す図であって、ねじ穴212の中心軸線CLを含む断面で見た場合の、図3に相当する縦断面図である。
[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. In the description, the difference from the first embodiment will be mainly described, and the rest will be omitted because it is the same as the first embodiment.
FIG. 9 is a diagram schematically showing the screw hole 212 of the metal plate 200 with a screw hole according to the present embodiment, and corresponds to FIG. 3 when viewed in a cross section including the central axis CL of the screw hole 212. It is a longitudinal cross-sectional view.
 本実施形態のねじ穴付き金属板200は、ねじ穴212を有する金属板であって、ねじ穴212が、金属板220の一方の面から立ち上がる円筒状の内壁部212bと、内壁部212bの端縁から内壁部212bの外側に折り返された円筒状の外壁部212aとを備え、内壁部212bの内周面に雌ねじ212b1が形成されている。
 この構成では、上記第1実施形態と異なり、内壁部212bによるスプリングバックの効果は得られないものの、雄ねじ(不図視)を締め込んだ際の内壁部212bの拡径方向の変形を、外壁部212aにより受け止めることができる。よって、内壁部212bの過度の変形を規制することができるので、金属板220の板厚を薄くしても、ねじ穴212の破損や締結力の低下を防ぐことができる。
 なお、本実施形態のねじ穴付き金属板200も、筐体の構成要素として用いることができる。すなわち、ねじ穴を有する金属板と、貫通孔を有する部材と、前記貫通孔に挿入された状態で前記ねじ穴にねじ込まれて前記金属板と前記貫通孔を有する部材とを結合する雄ねじと、を具備する筐体において、前記金属板として、上記のねじ穴付き金属板200を用いることができる。
The metal plate 200 with a screw hole of the present embodiment is a metal plate having a screw hole 212, and the screw hole 212 rises from one surface of the metal plate 220, and an end of the inner wall portion 212b. A cylindrical outer wall portion 212a folded from the edge to the outside of the inner wall portion 212b is provided, and a female screw 212b1 is formed on the inner peripheral surface of the inner wall portion 212b.
In this configuration, unlike the first embodiment, the effect of the spring back by the inner wall portion 212b is not obtained, but the deformation of the inner wall portion 212b in the diameter increasing direction when the male screw (not shown) is tightened is prevented. It can be received by the part 212a. Therefore, excessive deformation of the inner wall portion 212b can be restricted, so that the screw hole 212 can be prevented from being damaged or the fastening force can be reduced even if the thickness of the metal plate 220 is reduced.
In addition, the metal plate 200 with a screw hole of this embodiment can also be used as a component of a housing | casing. That is, a metal plate having a screw hole, a member having a through hole, a male screw that is screwed into the screw hole in a state of being inserted into the through hole, and couples the metal plate and the member having the through hole, The metal plate 200 with a screw hole can be used as the metal plate.
 本発明の効果を検証するために、本発明のねじ穴付き金属板の製造方法によって金属板にねじ穴を形成し、そのねじ穴の締結力を評価する試験を行った。 In order to verify the effect of the present invention, a screw hole was formed in the metal plate by the method for manufacturing a metal plate with a screw hole of the present invention, and a test for evaluating the fastening force of the screw hole was performed.
 供試材として、板厚0.4~0.6mmで引張強さが270MPa級の鋼板を用いた。これらの鋼板に、図5A~5Dを用いて説明した第1実施形態に係る、ねじ穴付き金属板の製造方法により、JIS B0205(2001)での呼び径がM3のねじ穴を加工した。 As a test material, a steel plate having a thickness of 0.4 to 0.6 mm and a tensile strength of 270 MPa was used. In these steel plates, screw holes with a nominal diameter of M3 in JIS B0205 (2001) were machined by the method for manufacturing a metal plate with screw holes according to the first embodiment described with reference to FIGS. 5A to 5D.
 外壁部成形ステップは、張り出し加工により行い、外径3.2mmの張り出し用パンチ35と、内径4.6mmの凹部を有するダイ36と、ブランクホルダ36aとを用い、高さが1.4mmの外壁部20aを成形した。その際、張り出し用パンチ35の肩半径Rを変化させた。また、穴あけステップは、穴あけ用パンチ31および穴あけ用ダイ32を用いてせん断加工により行い、その際に下穴20b1の半径rを変化させた。内壁部成形ステップは、先端がテーパー状の穴広げ用パンチ37と、穴広げ用ダイ38と、ブランクホルダ39とを用いて行った。穴広げ用パンチ37は、ストレート部の半径が1.2mmで、テーパー部の先端角部が中心軸線CLに対して60°の面取りを有し、テーパー部の先端の半径が1.4mmであるものを使用した。 The outer wall portion forming step is performed by an overhanging process, and uses an overhanging punch 35 having an outer diameter of 3.2 mm, a die 36 having a concave portion having an inner diameter of 4.6 mm, and a blank holder 36a. Part 20a was molded. At that time, the shoulder radius R of the overhanging punch 35 was changed. Further, the drilling step was performed by a shearing process using the drilling punch 31 and the drilling die 32, and the radius r of the pilot hole 20b1 was changed at that time. The inner wall portion forming step was performed using a hole expanding punch 37 having a tapered tip, a hole expanding die 38 and a blank holder 39. The hole expanding punch 37 has a straight portion with a radius of 1.2 mm, a corner portion of the tapered portion having a chamfer of 60 ° with respect to the central axis CL, and a radius of the distal end of the tapered portion of 1.4 mm. I used something.
 比較のため、図12A及び図12Bを用いて説明した加工フローにより、金属板に従来のバーリング加工によるねじ穴を形成したねじ穴付き金属板10も製作した(試験No.1-1A,2-1A,3-1A)。
 さらに、比較のために、背景技術において引用した特許文献2の図1に記載の構造を具備するねじ穴付き金属板(不図示)も製作した(試験No.1-1B,2-1B,3-1B)。この比較例は、上記実施形態1で示した図1を用いて説明するならば、雄ねじ50をねじ込んだ状態でも、外壁部12aの内周面と内壁部12bの外周面とが離れて大きな隙間が生じており、内壁部12bの周囲が外壁部12aによって支持されていない構造である。
For comparison, a metal plate 10 with a screw hole in which a screw hole by a conventional burring process is formed on a metal plate was also manufactured by the processing flow described with reference to FIGS. 12A and 12B (Test Nos. 1-1A, 2- 1A, 3-1A).
For comparison, a metal plate with a screw hole (not shown) having the structure shown in FIG. 1 of Patent Document 2 cited in the background art was also manufactured (Test Nos. 1-1B, 2-1B, 3). -1B). If this comparative example is described with reference to FIG. 1 shown in the first embodiment, even when the male screw 50 is screwed in, the inner peripheral surface of the outer wall portion 12a and the outer peripheral surface of the inner wall portion 12b are separated and have a large gap. This is a structure in which the periphery of the inner wall portion 12b is not supported by the outer wall portion 12a.
 各試験では、20枚の金属板をそれぞれ準備してねじ穴を加工した。その際、加工不良の発生件数を調査し、製造歩留りを算出した。 In each test, 20 metal plates were prepared and screw holes were machined. At that time, the number of processing defects was investigated and the production yield was calculated.
 また、各ねじ穴付き金属板のねじ穴について、締結力を評価するための試験を行った。ねじ穴の締結力を評価する試験では、締め付けトルクを測定可能なねじ締結装置を用いて雄ねじを金属板のねじ穴にねじ込んだ。その際、雄ねじの回転角と締め付けトルクとの関係を測定した。得られた雄ねじの回転角(°)と締め付けトルク(N・m)との関係を回転角について微分することにより、雄ねじの回転角(°)と締め付けトルクの変化割合(N・m/°)との関係を求めた。 Also, a test for evaluating the fastening force was performed on the screw holes of each metal plate with screw holes. In the test for evaluating the fastening force of the screw hole, the male screw was screwed into the screw hole of the metal plate using a screw fastening device capable of measuring the tightening torque. At that time, the relationship between the rotation angle of the male screw and the tightening torque was measured. Differentiating the relationship between the rotation angle (°) of the obtained male screw and the tightening torque (N · m) with respect to the rotation angle, the rate of change of the rotation angle (°) of the male screw and the tightening torque (N · m / °) Sought a relationship with.
 図10は、ねじ穴の締結力を評価する試験における、雄ねじの回転角と締め付けトルクとの関係、および、雄ねじの回転角と締め付けトルクの変化割合との関係を示す模式図である。同図に示すように、締め付けトルクは、雄ねじのねじ込みに伴って回転角が増加すると、初期段階のほぼ0(ゼロ)で一定な状態から増加に転じた後、再びほぼ一定となり、その後、減少する。このような回転角と締め付けトルクとの関係から、締め付けトルクが0で一定の状態から増加に転じる点Oを求めた。 FIG. 10 is a schematic diagram showing the relationship between the rotation angle of the male screw and the tightening torque and the relationship between the rotation angle of the male screw and the change rate of the tightening torque in the test for evaluating the fastening force of the screw hole. As shown in the figure, when the rotation angle increases as the male screw is screwed in, the tightening torque starts to increase from a constant state at approximately 0 (zero) in the initial stage, then becomes substantially constant again, and then decreases. To do. From such a relationship between the rotation angle and the tightening torque, a point O at which the tightening torque is 0 and the state is increased from a constant state was obtained.
 一方、締め付けトルクの変化割合は、雄ねじのねじ込みに伴って回転角が増加すると、上述の点Oで増加を開始した後、ほぼ一定となり、その後、減少する。このような雄ねじの回転角と締め付けトルクの変化割合との関係から、締め付けトルクの変化割合が一定の状態から減少に転じる回転角を求めた。この回転角における回転角と締め付けトルクとの関係を示す曲線上の点を、点Aとした。この点Aは、雌ねじ(ねじ穴)が塑性変形を開始した点を表す。 On the other hand, when the rotation angle increases as the male screw is screwed in, the change rate of the tightening torque becomes substantially constant after starting to increase at the above point O, and then decreases. From the relationship between the rotation angle of the male screw and the change rate of the tightening torque, the rotation angle at which the change rate of the tightening torque turns from a constant state to a decrease was obtained. A point on the curve indicating the relationship between the rotation angle and the tightening torque at this rotation angle was defined as a point A. This point A represents the point at which the internal thread (screw hole) has started plastic deformation.
 このように求めた点Oおよび点Aを結ぶ直線Lを引いた。また、直線Lを回転角が増加する方向に10°平行移動させた直線L’を引いた。この直線L’と回転角と締め付けトルクとの関係を示す曲線との交点を点Bとした。ねじ穴の締結力を評価する指標として、点Aの締め付けトルクTA(N・m)に対する点Bの締め付けトルク(N・m)の比(TB/TA、無次元)を算出した。このようなTB/TAは、雌ねじが塑性変形を開始した後に締結トルクが維持される割合、換言すると、雌ねじが塑性変形を開始した後にねじ穴の雄ねじとの締結力が維持される割合を示す。このため、TB/TAが大きくなる程にねじ穴が雄ねじとの締結力に優れる。 The straight line L connecting the points O and A thus obtained was drawn. Also, a straight line L ′ obtained by translating the straight line L by 10 ° in the direction in which the rotation angle increases is drawn. An intersection point of the straight line L ′ and a curve indicating the relationship between the rotation angle and the tightening torque was defined as a point B. As an index for evaluating the fastening force of the screw hole, the ratio (TB / TA, dimensionless) of the tightening torque (N · m) at point B to the tightening torque TA (N · m) at point A was calculated. Such TB / TA indicates a rate at which the fastening torque is maintained after the female screw starts plastic deformation, in other words, a rate at which the fastening force with the male screw in the screw hole is maintained after the female screw starts plastic deformation. . For this reason, the larger the TB / TA is, the more excellent the fastening force of the screw hole with the male screw.
 表1~3における「締結力の評価」欄の記号の意味は以下の通りである。
VG(Very Good):TB/TA≧1.2を満足することを示す。
GD(Good):1.2>TB/TA≧1.0を満足することを示す。
FA(Fair):1.0>TB/TA≧0.8を満足することを示す。
BD(Bad):TB/TA<0.8を満足することを示す。
The meanings of the symbols in the “Evaluation of fastening force” column in Tables 1 to 3 are as follows.
VG (Very Good): indicates that TB / TA ≧ 1.2 is satisfied.
GD (Good): Indicates that 1.2> TB / TA ≧ 1.0 is satisfied.
FA (Fair): Indicates that 1.0> TB / TA ≧ 0.8 is satisfied.
BD (Bad): Indicates that TB / TA <0.8 is satisfied.
 表1~3に、各試験における試験No.、金属板の板厚t、ねじ穴の加工法、張り出し用パンチの肩半径R、R/tの値、前記(1)式に適合しているか否か、内壁部成形前の下穴の半径r、r/tの値、前記(2)式に適合しているか否か、製造歩留り、締結力の指標TB/TAの値およびその評価、並びに、試験区分をそれぞれ示す。ここで、前記(1)式への適合は、「Y」の場合にR/tの値が前記(1)式を満足することを示し、「N」の場合にR/tの値が前記(1)式を満足しないことを示す。また、前記(2)式への適合は、「Y」の場合にr/tの値が前記(2)式を満足することを示し、「N」の場合にr/tの値が前記(2)式を満足しないことを示す。 Tables 1 to 3 show the test numbers in each test. , Thickness t of metal plate, processing method of screw hole, shoulder radius R of overhanging punch, R / t value, conformity with the above formula (1), radius of pilot hole before inner wall forming The values of r and r / t, whether or not the equation (2) is satisfied, the production yield, the value of the fastening force index TB / TA and its evaluation, and the test category are shown. Here, the conformity to the equation (1) indicates that the value of R / t satisfies the equation (1) in the case of “Y”, and the value of R / t is in the case of “N”. (1) Indicates that the expression is not satisfied. The conformity to the equation (2) indicates that the value of r / t satisfies the equation (2) when “Y”, and the value of r / t when the value is “N”. 2) Indicates that the expression is not satisfied.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
 表1~3より、締結力の評価が、比較例ではBDになったのに対し、本発明例ではVG,GD,又はFAとなった。したがって、本発明のねじ穴付き金属板、それを具備する筐体および金属板の製造方法は、ねじ穴が雄ねじとの締結力に優れることが確認できた。 From Tables 1 to 3, the fastening force was evaluated as BD in the comparative example, but as VG, GD, or FA in the example of the present invention. Therefore, the metal plate with a screw hole of this invention, the housing | casing which comprises it, and the manufacturing method of a metal plate have confirmed that the screw hole was excellent in the fastening force with a male screw.
 また、比較例(試験No.1-1A,2-1A,3-1A)では、バーリング加工で縦壁部の根元が減肉によって破けたり、ねじ切りでねじ穴のねじ山を十分に形成できなかったりすることよる製品不良が発生し、その発生数は供試材の板厚が薄くなるに伴って増加した。その結果、比較例では、製造歩留りがいずれも70%以下となった。これに対し、本発明例では、いずれも90%以上となり、製造歩留りを向上できた。
 また、比較例(試験No.1-1B,2-1B,3-1B)では、内壁部に相当する雌ねじ加工部分が、外壁部に相当する周囲部分により支持されていないために剛性が低く、そのために、正確なタッピングがしづらく加工精度が保てない、雌ねじの加工精度が周方向で不均一である、といった問題点が見られた。このように、内壁部に相当する雌ねじ加工部分の剛性が弱く、しかも雌ねじの加工精度が低いと、雌ねじ及び雄ねじ間の係り具合が、雌ねじの周方向で不均一になりやすい。
Further, in the comparative examples (Test Nos. 1-1A, 2-1A, 3-1A), the base of the vertical wall portion is broken by thinning due to burring, or the thread of the screw hole cannot be sufficiently formed by threading. The number of occurrences increased as the thickness of the specimen became thinner. As a result, in the comparative example, the production yield was 70% or less. On the other hand, in the example of this invention, all became 90% or more, and the manufacturing yield could be improved.
Further, in the comparative examples (Test Nos. 1-1B, 2-1B, 3-1B), the internal thread portion corresponding to the inner wall portion is not supported by the peripheral portion corresponding to the outer wall portion, so the rigidity is low. For this reason, there are problems such that it is difficult to perform accurate tapping and the processing accuracy cannot be maintained, and the processing accuracy of the female screw is not uniform in the circumferential direction. Thus, if the rigidity of the internal thread processing portion corresponding to the inner wall is weak and the processing accuracy of the internal thread is low, the engagement between the internal thread and the external thread tends to be uneven in the circumferential direction of the internal thread.
 また、本発明例のうちでR/tの値が0.5未満の試験、および、R/tの値が1.0を超えた試験では、いずれも製造歩留りに若干の低下が確認された。一方、r/tの値が0.5未満の試験では、製造歩留りに若干の低下が確認された。また、r/tの値が1.2以下の試験では締結力の評価がVGまたはGDとなったのに対し、r/tの値が1.2を超えた試験では、締結力の評価がFAとなった。これらから、外壁部成形ステップにおいて前記(1)式を満足するパンチを用いるとともに、内壁部成形前の下穴の半径rが前記(2)式を満足するように下穴をあけることにより、製造歩留りおよびねじ穴の締結力をさらに向上できることが明らかになった。 Further, in the examples of the present invention, in the test where the R / t value was less than 0.5 and the test where the R / t value exceeded 1.0, both of the production yields were confirmed to be slightly decreased. . On the other hand, in the test where the value of r / t was less than 0.5, a slight decrease in production yield was confirmed. In addition, in the test where the r / t value is 1.2 or less, the fastening force is evaluated as VG or GD, whereas in the test where the r / t value exceeds 1.2, the fastening force is evaluated. It became FA. From these, it is possible to manufacture by using a punch that satisfies the expression (1) in the outer wall forming step and making a prepared hole so that the radius r of the prepared hole before forming the inner wall satisfies the expression (2). It was revealed that the yield and the fastening force of the screw holes can be further improved.
 本発明のねじ穴付き金属板、ねじ穴付き金属板を具備する筐体、およびねじ穴付き金属板の製造方法によれば、薄肉化した場合でも、ねじ穴が雄ねじとの締結力に優れるとともにねじ穴の破損を防止できる。したがって、本発明のねじ穴付き金属板、ねじ穴付き金属板を具備する筐体、およびねじ穴付き金属板の製造方法をエアコンの室外機や変電設備の筐体に適用すれば、金属板の薄肉化に大きく寄与することができる。 According to the metal plate with a screw hole, the housing provided with the metal plate with a screw hole, and the manufacturing method of the metal plate with a screw hole according to the present invention, the screw hole has excellent fastening force with a male screw even when it is thinned. Damage to screw holes can be prevented. Therefore, if the metal plate with a threaded hole of the present invention, the housing provided with the metal plate with a threaded hole, and the method for producing the metal plate with a threaded hole are applied to an outdoor unit of an air conditioner or a housing of a substation facility, This can greatly contribute to thinning.
 10,100,110,200:ねじ穴付き金属板
 10x:金属板の一方の面
 10y:金属板の他方の面
12:ねじ穴
 12a,212a:外壁部
 12b,212b:内壁部
 12b1,212b1:雌ねじ
 12b3:内壁部の先端
 20b:円板部
 37:パンチ
 50:雄ねじ
 51:部材
 51a:貫通孔
 70:筐体
10, 100, 110, 200: Metal plate with screw hole 10x: One surface of metal plate 10y: Other surface of metal plate 12: Screw hole 12a, 212a: Outer wall portion 12b, 212b: Inner wall portion 12b1, 212b1: Female screw 12b3: tip of inner wall portion 20b: disc portion 37: punch 50: male screw 51: member 51a: through hole 70: housing

Claims (14)

  1.  ねじ穴を有する金属板であって、
     前記ねじ穴が、前記金属板の一方の面から立ち上がる円筒状の外壁部と、前記外壁部の端縁から前記外壁部の内側に折り返された円筒状の内壁部とを備え、
     前記内壁部の内周面に雌ねじが形成されている
    ことを特徴とする、ねじ穴付き金属板。
    A metal plate having a screw hole,
    The screw hole includes a cylindrical outer wall portion that rises from one surface of the metal plate, and a cylindrical inner wall portion that is folded back from the edge of the outer wall portion to the inside of the outer wall portion,
    A metal plate with a screw hole, wherein an internal thread is formed on an inner peripheral surface of the inner wall portion.
  2.  前記内壁部の先端と、前記金属板の他方の面とが面一であることを特徴とする、請求項1に記載のねじ穴付き金属板。 The metal plate with a screw hole according to claim 1, wherein the tip of the inner wall portion and the other surface of the metal plate are flush with each other.
  3.  前記ねじ穴の前記雌ねじに雄ねじが螺合されていない状態では、前記外壁部の内周面より前記内壁部の外周面が離間し、
     前記ねじ穴の前記雌ねじに前記雄ねじが螺合されている状態では、前記外壁部の前記内周面に前記内壁部の前記外周面の少なくとも一部が当接する
    ことを特徴とする、請求項1に記載のねじ穴付き金属板。
    In a state where a male screw is not screwed into the female screw of the screw hole, the outer peripheral surface of the inner wall portion is separated from the inner peripheral surface of the outer wall portion,
    The at least one part of the said outer peripheral surface of the said inner wall part contact | abuts to the said inner peripheral surface of the said outer wall part in the state in which the said male screw is screwed together by the said female screw of the said screw hole, A metal plate with a screw hole according to 1.
  4.  前記内壁部の先端と、前記金属板の他方の面とが面一であることを特徴とする、請求項3に記載のねじ穴付き金属板。 The metal plate with a screw hole according to claim 3, wherein the tip of the inner wall portion and the other surface of the metal plate are flush with each other.
  5.  ねじ穴を有する金属板であって、
     前記ねじ穴が、前記金属板の一方の面から立ち上がる円筒状の内壁部と、前記内壁部の端縁から前記内壁部の外側に折り返された円筒状の外壁部とを備え、
     前記内壁部の内周面に雌ねじが形成されている
    ことを特徴とする、ねじ穴付き金属板。
    A metal plate having a screw hole,
    The screw hole includes a cylindrical inner wall portion that rises from one surface of the metal plate, and a cylindrical outer wall portion that is folded back from the edge of the inner wall portion to the outside of the inner wall portion,
    A metal plate with a screw hole, wherein an internal thread is formed on an inner peripheral surface of the inner wall portion.
  6.  ねじ穴を有する金属板と、貫通孔を有する部材と、前記貫通孔に挿入された状態で前記ねじ穴にねじ込まれて前記金属板と前記貫通孔を有する部材とを結合する雄ねじと、を具備する筐体であって、
     前記金属板が、請求項1~5の何れか一項に記載のねじ穴付き金属板であることを特徴とする筐体。
    A metal plate having a screw hole; a member having a through hole; and a male screw that is screwed into the screw hole while being inserted into the through hole to couple the metal plate and the member having the through hole. A housing that
    A casing, wherein the metal plate is a metal plate with a screw hole according to any one of claims 1 to 5.
  7.  請求項1~4の何れか一項に記載のねじ穴付き金属板を製造する方法であって、
     前記外壁部及び前記外壁部の内側に連続する円板部を前記金属板に成形するステップと、
     前記円板部の中心に下穴をあけるステップと、
     前記下穴があけられた前記円板部を、前記外壁部の内側に折り曲げて前記内壁部を成形するステップと、
     成形された前記内壁部の前記内周面に前記雌ねじを加工するステップと
    を有することを特徴とする、ねじ穴付き金属板の製造方法。
    A method for producing a metal plate with a screw hole according to any one of claims 1 to 4,
    Forming the outer wall portion and a disk portion continuous inside the outer wall portion into the metal plate;
    Drilling a pilot hole in the center of the disc part;
    Bending the disk portion with the prepared hole formed inside the outer wall portion to form the inner wall portion; and
    And a step of processing the female screw on the inner peripheral surface of the molded inner wall portion.
  8.  厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(1)式を満たす半径R(mm)の肩寸法を有するパンチを用いることを特徴とする、請求項7に記載のねじ穴付き金属板の製造方法。
      0.5≦R/t≦1.0   (1)式
    In the step of forming the outer wall portion and the disc portion on the metal plate having a thickness dimension t (mm), a punch having a shoulder dimension with a radius R (mm) satisfying the following expression (1) is used. The manufacturing method of the metal plate with a screw hole of Claim 7.
    0.5 ≦ R / t ≦ 1.0 (1) Formula
  9.  厚み寸法t(mm)の前記金属板に前記下穴をあけるステップで、前記下穴の半径r(mm)が下式(2)を満たすように前記下穴をあけることを特徴とする、請求項7に記載のねじ穴付き金属板の製造方法。
      0.5≦r/t≦1.2   (2)式
    In the step of opening the pilot hole in the metal plate having a thickness dimension t (mm), the pilot hole is formed so that a radius r (mm) of the pilot hole satisfies the following formula (2). Item 8. A method for producing a metal plate with screw holes according to Item 7.
    0.5 ≦ r / t ≦ 1.2 Formula (2)
  10.  厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(1)式を満たす半径R(mm)の肩寸法を有するパンチを用い、
     前記金属板に前記下穴をあけるステップで、前記下穴の半径r(mm)が下式(2)を満たすように前記下穴をあける
    ことを特徴とする、請求項7に記載のねじ穴付き金属板の製造方法。
      0.5≦R/t≦1.0   (1)式
      0.5≦r/t≦1.2   (2)式
    In the step of forming the outer wall portion and the disc portion on the metal plate having a thickness dimension t (mm), a punch having a shoulder dimension with a radius R (mm) satisfying the following expression (1) is used:
    The screw hole according to claim 7, wherein the pilot hole is formed so that a radius r (mm) of the pilot hole satisfies the following formula (2) in the step of drilling the pilot hole in the metal plate. A manufacturing method of a metal plate with a ring.
    0.5 ≦ R / t ≦ 1.0 (1) Formula 0.5 ≦ r / t ≦ 1.2 (2) Formula
  11.  請求項1~4の何れか一項に記載のねじ穴付き金属板を製造する方法であって、
     下穴を前記金属板にあける穴あけステップと、
     前記下穴と同心に、前記外壁部、及び前記外壁部の内側に連続する円板部を成形するステップと、
     前記円板部を前記外壁部の内側に折り曲げて前記内壁部を成形するステップと、
     前記内壁部の前記内周面に前記雌ねじを加工するステップと、
    を有することを特徴とする、ねじ穴付き金属板の製造方法。
    A method for producing a metal plate with a screw hole according to any one of claims 1 to 4,
    A step of drilling a pilot hole in the metal plate;
    Concentrically with the pilot hole, forming the outer wall portion and a disk portion continuous inside the outer wall portion;
    Bending the disc part inside the outer wall part to form the inner wall part;
    Processing the female thread on the inner peripheral surface of the inner wall portion;
    The manufacturing method of the metal plate with a screw hole characterized by having.
  12.  厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(1)式を満たす半径R(mm)の肩寸法を有するパンチを用いることを特徴とする、請求項11に記載のねじ穴付き金属板の製造方法。
      0.5≦R/t≦1.0   (1)式
    In the step of forming the outer wall portion and the disc portion on the metal plate having a thickness dimension t (mm), a punch having a shoulder dimension with a radius R (mm) satisfying the following expression (1) is used. The manufacturing method of the metal plate with a screw hole of Claim 11.
    0.5 ≦ R / t ≦ 1.0 (1) Formula
  13.  厚み寸法t(mm)の前記金属板に前記下穴をあけるステップで、前記円板部を形成するステップ後の前記下穴の半径r(mm)が下式(2)を満たすように、前記下穴をあけることを特徴とする、請求項11に記載のねじ穴付き金属板の製造方法。
      0.5≦r/t≦1.2   (2)式
    In the step of drilling the pilot hole in the metal plate having a thickness dimension t (mm), the radius r (mm) of the pilot hole after the step of forming the disk portion satisfies the following formula (2): The method for producing a metal plate with screw holes according to claim 11, wherein a pilot hole is formed.
    0.5 ≦ r / t ≦ 1.2 Formula (2)
  14.  厚み寸法t(mm)の前記金属板に前記外壁部および前記円板部を成形するステップで、下記(1)式を満たす半径R(mm)の肩寸法を有するパンチを用い、
     前記金属板に前記下穴をあけるステップで、前記円板部を形成するステップ後の前記下穴の半径r(mm)が下式(2)を満たすように、前記下穴をあける
    ことを特徴とする、請求項11に記載のねじ穴付き金属板の製造方法。
      0.5≦R/t≦1.0   (1)式
      0.5≦r/t≦1.2   (2)式
    In the step of forming the outer wall portion and the disc portion on the metal plate having a thickness dimension t (mm), a punch having a shoulder dimension with a radius R (mm) satisfying the following expression (1) is used:
    In the step of drilling the pilot hole in the metal plate, the pilot hole is drilled so that a radius r (mm) of the pilot hole after the step of forming the disc portion satisfies the following formula (2). The manufacturing method of the metal plate with a screw hole of Claim 11.
    0.5 ≦ R / t ≦ 1.0 (1) Formula 0.5 ≦ r / t ≦ 1.2 (2) Formula
PCT/JP2014/069244 2013-07-25 2014-07-18 Metal plate with tapped hole, frame, and method for manufacturing metal plate with tapped hole WO2015012236A1 (en)

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MYPI2015703641A MY182951A (en) 2013-07-25 2014-07-18 Metal plate with screw hole, housing, and method of manufacturing metal plate with screw hole
CN201480019744.6A CN105408641B (en) 2013-07-25 2014-07-18 The manufacture method of metallic plate with threaded hole, housing and metallic plate with threaded hole
KR1020157027280A KR101811931B1 (en) 2013-07-25 2014-07-18 Metal plate with tapped hole, frame, and method for manufacturing metal plate with tapped hole
JP2015528277A JP6137319B2 (en) 2013-07-25 2014-07-18 Metal plate with screw hole, housing, and method for manufacturing metal plate with screw hole
MX2015016278A MX2015016278A (en) 2013-07-25 2014-07-18 Metal plate with tapped hole, frame, and method for manufacturing metal plate with tapped hole.

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CN109175902A (en) * 2018-09-21 2019-01-11 北京长城华冠汽车科技股份有限公司 The manufacturing process of beam upper installing hole
KR20240082008A (en) * 2022-12-01 2024-06-10 삼성전자주식회사 Refrigerator

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