WO2015141857A1 - 締結部材および締結部材用棒状部材 - Google Patents
締結部材および締結部材用棒状部材 Download PDFInfo
- Publication number
- WO2015141857A1 WO2015141857A1 PCT/JP2015/058620 JP2015058620W WO2015141857A1 WO 2015141857 A1 WO2015141857 A1 WO 2015141857A1 JP 2015058620 W JP2015058620 W JP 2015058620W WO 2015141857 A1 WO2015141857 A1 WO 2015141857A1
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- WIPO (PCT)
- Prior art keywords
- alloy
- fastening member
- less
- aluminum alloy
- rod
- Prior art date
Links
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 99
- 239000000956 alloy Substances 0.000 claims abstract description 99
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 71
- 239000011777 magnesium Substances 0.000 claims abstract description 18
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 16
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011701 zinc Substances 0.000 claims abstract description 14
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims description 33
- 239000002344 surface layer Substances 0.000 claims description 20
- 238000005260 corrosion Methods 0.000 description 32
- 230000007797 corrosion Effects 0.000 description 32
- 238000005336 cracking Methods 0.000 description 30
- 239000000463 material Substances 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000010949 copper Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005491 wire drawing Methods 0.000 description 6
- 229910000861 Mg alloy Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052706 scandium Inorganic materials 0.000 description 2
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
Definitions
- the present invention relates to a fastening member that fastens a plurality of members, and a fastening member rod-like member used for manufacturing the fastening member.
- an aluminum alloy is used as an engine block material instead of cast iron
- a magnesium alloy is used as an engine cover or oil pan material instead of steel.
- Patent Document 1 discloses a 6000 series aluminum alloy as a material for bolts that is excellent in workability during bolt manufacturing and has sufficient strength.
- Aluminum alloy bolts have a small difference in coefficient of linear expansion from aluminum alloys and magnesium alloys that make up various parts and low contact corrosion of different metals, so the screw holes in parts can be made shallower and the bolt diameter can be made thinner. Even so, the fastening reliability can be ensured, which is suitable for reducing the weight.
- 7000 series aluminum alloy is known as an aluminum alloy having higher strength than the above-described 6000 series aluminum alloy (see, for example, Patent Document 2). If a 7000 series aluminum alloy is used, a bolt with higher strength than a bolt made of a 6000 series aluminum alloy can be produced.
- the present invention has been made in view of the above, and an object thereof is to provide a fastening member excellent in strength and stress corrosion cracking resistance, and a fastening member rod-like member used for manufacturing the fastening member.
- a fastening member according to the present invention is a fastening member that fastens a plurality of members, and contains 0.005 wt% or more and 5.0 wt% or less of zinc, and magnesium.
- a second alloy part formed of an aluminum alloy containing zinc in an amount greater than 5.0% by weight and less than 10% by weight and bonded to the first alloy part.
- the fastening member according to the present invention is characterized in that, in the above invention, the second alloy part has a Vickers hardness of 170 or more.
- the fastening member according to the present invention is characterized in that, in the above invention, a thread is formed on a part of the surface of the first alloy part.
- the fastening member according to the present invention is the above-described invention, wherein in the above invention, a cylindrical shaft portion in which the screw thread is formed on at least a part of an outer periphery, a head portion provided at one end in the axial direction of the shaft portion, and the shaft portion
- the male screw having a neck portion that forms a boundary with the head portion, and the first alloy portion comprises at least a surface layer portion of the screw thread, a surface of the neck portion, and a surface layer portion of the seating surface of the head,
- a thickness of a surface layer portion of the screw thread in the first alloy portion is 1/2000 or more and 1/10 or less of a maximum outer diameter of the shaft portion.
- the fastening member according to the present invention is the female screw in which the thread is formed on the inner surface of the hole formed in the central portion in the above invention, and the second alloy portion is positioned on the outer peripheral side of the first alloy portion.
- the radial thickness of the first alloy part is 1/2000 or more and 1/10 or less of the maximum outer diameter of the female screw.
- the fastening member according to the present invention is the rivet having a columnar shaft portion, a head portion provided at one end portion in the axial direction of the shaft portion, and a neck portion that forms a boundary between the shaft portion and the head portion.
- the first alloy part comprises at least a surface layer part of the shaft part, a surface of the neck part, and a surface layer part of a seating surface of the head part, and the radial direction of the first alloy part in the shaft part
- the thickness is from 1/2000 to 1/10 of the outer diameter of the shaft portion.
- the rod member for a fastening member according to the present invention has a columnar shape, and includes a core portion made of an aluminum alloy containing magnesium in an amount greater than 2.0 wt% and less than or equal to 5.0 wt% and zinc in an amount greater than 5.0 wt% and less than or equal to 10 wt%. And a hollow cylindrical shape that covers the side surface of the core portion without any gap, and is made of an aluminum alloy containing 0.005 wt% to 5.0 wt% of zinc and 0.6 wt% to 2.0 wt% of magnesium. And an outer peripheral portion.
- the rod-shaped member for a fastening member according to the present invention is characterized in that, in the above invention, the radial thickness of the outer peripheral portion is not less than 1/2000 and not more than 1/10 of the maximum outer diameter of the outer peripheral portion.
- the rod member for a fastening member according to the present invention has a hollow cylindrical shape, and includes a core made of an aluminum alloy containing 0.005 wt% to 5.0 wt% of zinc and 0.6 wt% to 2.0 wt% of magnesium. And an aluminum alloy containing magnesium more than 2.0 wt% and less than 5.0 wt% and zinc more than 5.0 wt% and less than 10 wt% And an outer peripheral portion.
- the rod-shaped member for a fastening member according to the present invention is characterized in that, in the above invention, the thickness of the core portion in the radial direction is not less than 1/2000 and not more than 1/10 of the maximum outer diameter of the outer peripheral portion.
- a clad material comprising a high-strength aluminum alloy and an aluminum alloy excellent in stress corrosion cracking resistance, it is possible to provide a fastening member excellent in strength and stress corrosion cracking resistance. it can.
- FIG. 1 is a side view showing a configuration of a fastening member according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view passing through the central axis of the fastening member shown in FIG.
- FIG. 3 is an enlarged view of a region D in FIG.
- FIG. 4 is a cross-sectional view showing the configuration of the fastening member bar-shaped member according to Embodiment 1 of the present invention.
- FIG. 5 is a plan view showing a configuration of a fastening member according to Embodiment 2 of the present invention.
- 6 is a cross-sectional view taken along line AA in FIG. FIG.
- FIG. 7 is a cross-sectional view showing a configuration of a fastening member bar-shaped member according to Embodiment 2 of the present invention.
- FIG. 8 is a cross-sectional view illustrating a configuration after the punching process is performed on the fastening member bar-shaped member according to the second embodiment of the present invention.
- FIG. 9 is a side view showing the configuration of the fastening member according to Embodiment 3 of the present invention.
- FIG. 10 is a cross-sectional view passing through the central axis of the fastening member shown in FIG.
- FIG. 1 is a side view showing a configuration of a fastening member according to Embodiment 1 of the present invention.
- 2 is a cross-sectional view that passes through the central axis in the longitudinal direction (left-right direction in FIG. 1) of the fastening member shown in FIG.
- the fastening member 1 shown in these drawings is a bolt (a kind of male screw) made of a clad material formed by joining two different types of aluminum (Al) alloys.
- the fastening member 1 includes a shaft portion 2 having a columnar shape, a head 3 provided at one end of the shaft portion 2 in the axial direction (left and right direction in FIG. 1), and a neck portion that forms a boundary between the shaft portion 2 and the head 3. 4.
- the shaft portion 2 has a screw portion 22 having a screw thread 21 formed on the surface thereof.
- the shape of the head 3 shown in FIG. 1 (hexagon trim type) is merely an example, and may have other shapes (hexagon flange type, pan type, pan type, truss type, flat type, etc.). I do not care.
- the fastening member 1 has the 1st alloy part 1a and the 2nd alloy part 1b which are each formed using two mutually different types of aluminum alloys.
- the 1st alloy part 1a is provided in the part which contacts the member of fastening object. That is, the first alloy portion 1 a constitutes a surface layer portion of the shaft portion 2, a surface of the neck portion 4, a seating surface 31 of the head portion 3, and a surface layer portion of the side surface 32.
- the second alloy part 1 b constitutes the radially inner peripheral side of the shaft part 2 and the head part 3.
- the first alloy part 1a is made of an aluminum alloy containing 0.005 wt% or more and 5.0 wt% or less of zinc (Zn) and 0.6 wt% or more and 2.0 wt% or less of magnesium (Mg).
- This aluminum alloy is preferably copper (Cu), chromium (Cr), zirconium (Zr), iron (Fe), silicon (Si), manganese (Mn), titanium (Ti), vanadium (V), scandium (Sc).
- An example of the aluminum alloy having such a composition is A6056.
- A6056 is an alloy containing Al—Mg—Si as a main element, and is known as an aluminum alloy having relatively high strength and excellent resistance to stress corrosion cracking.
- the thickness of the 1st alloy part 1a is 10 micrometers or more and 1.5 mm or less.
- the radial thickness of the first alloy portion 1a in the shaft portion 2 is not less than 1/2000 and not more than 1/10 of the maximum outer diameter r 1 of the shaft portion 2 (see FIG. 2).
- the second alloy part 1b is made of an aluminum alloy containing magnesium (Mg) greater than 2.0 wt% and less than 5.0 wt% and zinc (Zn) greater than 5.0 wt% and less than 10 wt%.
- This aluminum alloy is preferably copper (Cu), chromium (Cr), zirconium (Zr), iron (Fe), silicon (Si), manganese (Mn), titanium (Ti), vanadium (V), scandium (Sc). At least one selected from the group consisting of copper (Cu) and zirconium (Zr).
- An example of an aluminum alloy having such a composition is A7050.
- A7050 is known as a high strength aluminum alloy.
- As a specific strength of the second alloy part 1b it is desirable that the Vickers hardness is 170 or more.
- FIG. 3 is an enlarged view of a region D in FIG.
- the radial thickness of the surface layer portion of the thread 21 of the screw portion 22 in the first alloy portion 1a is not necessarily uniform, and the thickness t 1 of the top 21a is the thickness t of the valley bottom 21b. Greater than 2 (t 1 > t 2 ).
- the radial thickness of the surface layer portion of the screw thread 21 is included in the range of 1/2000 to 1/10 of the maximum outer diameter r 1 of the shaft portion 2.
- at least a portion of the screw portion 22 that contacts the member to be fastened is an aluminum alloy having excellent stress corrosion cracking resistance.
- FIG. 4 is a cross-sectional view illustrating a configuration of a fastening member rod-like member that is a raw material of the fastening member 1.
- a fastening member rod-like member 100 (hereinafter simply referred to as “rod-like member 100”) shown in the figure covers a cylindrical core portion 101 made of the same aluminum alloy as the second alloy portion 1b and the outer periphery of the core portion 101.
- the first alloy part 1a and the outer peripheral part 102 made of the same aluminum alloy form a two-layered columnar shape.
- the thickness t 100 of the outer peripheral portion 102 is 1/2000 or 1/10 of the diameter r 100 of the rod 100 (r 100/2000 ⁇ t 100 ⁇ r 100/10).
- the fastening member 1 is formed by subjecting the rod-shaped member 100 to wire drawing or header processing. In order to enable such forming, it is desirable that the elongation at break at room temperature (about 1 to 35 ° C.) of the aluminum alloy constituting the core portion 101 which becomes the second alloy portion 1b after forming is 8% or more. .
- the fastening member 1 When the fastening member 1 is formed by subjecting the rod-shaped member 100 to wire drawing and header processing, a fiber flow in which the metal crystal is stretched into a fiber shape along the screw surface shape is observed. When a crack occurs in the threaded portion 22, the crack advances so as to cross the fiber flow. Therefore, stress corrosion cracking can be suppressed due to the fiber flow.
- Embodiment 1 of this invention while providing the 1st alloy part which consists of an aluminum alloy excellent in stress corrosion cracking resistance in the part which contacts the member of fastening object, it is high strength in parts other than the above, a fastening member excellent in strength and stress corrosion cracking resistance can be provided.
- the outer peripheral side including the screw thread constitutes the male screw which is the first alloy part, and the thickness in the radial direction of the surface layer portion of the screw thread of the male screw is 1 / of the outer diameter of the screw part. Since it is 2000 or more and 1/10 or less, intensity
- the hollow cylindrical shape is provided, and the portion that comes into contact with the member to be fastened is provided with the outer peripheral portion made of an aluminum alloy having excellent resistance to stress corrosion cracking, and the outer peripheral portion is covered with no gap.
- a rod-shaped member for a fastening member which is a clad material having a cylindrical shape and a core made of a high-strength aluminum alloy, the strength and stress corrosion cracking resistance can be achieved by the same manufacturing method as before. It is possible to mold a fastening member (male screw) excellent in the above.
- the radial thickness of the outer peripheral portion of the fastening member rod-shaped member is 1/2000 or more and 1/10 or less of the diameter of the fastening member rod-shaped member, In the fastening member (male thread), the strength and the stress corrosion cracking resistance can both be achieved in an appropriate balance.
- FIG. 5 is a plan view showing a configuration of a fastening member according to Embodiment 2 of the present invention.
- 6 is a cross-sectional view taken along line AA in FIG.
- the fastening member 5 shown in these drawings is a nut (a kind of female screw) made of a clad material formed by joining two different types of aluminum alloys.
- the fastening member 5 has a hollow cylindrical shape, and a thread 52 is formed on the inner surface of a hole 51 formed at the center.
- the shape (hexagonal nut) of the fastening member 5 shown in FIG. 5 is only an example, and can be realized as a nut having another shape (a nut with a flange, a cap nut, a high nut, or the like).
- the fastening member 5 includes a first alloy part 5a and a second alloy part 5b that are formed using two different types of aluminum alloys.
- the 1st alloy part 5a makes the ring shape which comprises the surface layer part of the screw thread 52 which is a part which contacts the member of fastening object.
- the 2nd alloy part 5b makes the ring shape which coat
- the first alloy part 5a is made of the same aluminum alloy as the first alloy part 1a of the first embodiment
- the second alloy part 5b is made of the same aluminum alloy as the second alloy part 1b of the first embodiment.
- the point that the thickness of the 1st alloy part 5a is 10 micrometers or more and 1.5 mm or less is the same as that of the 1st alloy part 1a.
- the radial thickness of the first alloy part 5a is not less than 1/2000 and not more than 1/10 of the maximum outer diameter (equivalent outer diameter of the circle) r 2 of the fastening member 5 (see FIG. 6).
- the second alloy part 5b is similar to the second alloy part 1b in that the Vickers hardness is 170 or more and that the elongation at break of the second alloy part 5b at room temperature is 8% or more.
- the thickness in the radial direction of the surface layer portion of the thread 52 in the first alloy portion 5a is not necessarily uniform, and is 1/2000 or more and 1/10 or less of the maximum outer diameter (equivalent circular outer diameter) r 2 of the fastening member 5. Included in the range.
- at least the thread 52 that is in contact with the member to be fastened is an aluminum alloy having excellent stress corrosion cracking resistance.
- FIG. 7 is a cross-sectional view showing a configuration of a fastening member rod-shaped member that is a raw material of the fastening member 5.
- a fastening member rod-shaped member 200 (hereinafter, simply referred to as a “rod-shaped member 200”) shown in the figure covers a cylindrical core portion 201 made of the same aluminum alloy as the first alloy portion 5a and an outer periphery of the core portion 201.
- the fastening member 5 is formed by subjecting the rod-shaped member 200 to wire drawing, core core 201 cutting, header processing, and the like. In order to enable such forming, it is desirable that the elongation at break of the aluminum alloy constituting the outer peripheral portion 202 to be the second alloy portion 5b after forming is 8% or more at room temperature.
- FIG. 8 is a cross-sectional view illustrating a configuration after the core portion 201 is cut in the rod-shaped member 200.
- a rod-shaped member 200 ′ shown in FIG. 8 includes a core portion 201 ′ and an outer peripheral portion 202 ′.
- the core portion 201 'radial thickness t 200 of the rod-like member 200' is 1/2000 or 1/10 of the diameter r 200 of (r 200/2000 ⁇ t 200 ⁇ r 200/10) .
- a bar-shaped member 200 ′ having a core portion 201 ′ having a hole 211 ′ is obtained by performing a hollowing process.
- the fastening member 5 is formed by performing header processing etc.
- the wire drawing process may be performed after the bar-shaped member 200 is cut.
- a cutting process may be performed after cutting to a length necessary to form the fastening member 5 (nut).
- the first alloy portion made of an aluminum alloy having excellent stress corrosion cracking resistance is provided in the portion in contact with the member to be fastened, and the outer peripheral side of the first alloy portion.
- a fastening member having excellent strength and stress corrosion cracking resistance can be provided as in the first embodiment.
- the thread is formed on a part of the surface of the first alloy portion, the stress corrosion cracking resistance of the contact portion with the member to be fastened can be improved. .
- the inner peripheral side constitutes a female screw that is the first alloy part
- the radial thickness of the first alloy part is 1/2000 or more and 1/10 or less of the maximum outer diameter of the female screw. Therefore, it is possible to achieve both strength and stress corrosion cracking resistance in an appropriate balance.
- a hollow cylindrical shape is formed, and a core portion made of an aluminum alloy having excellent stress corrosion cracking resistance is provided in a portion that comes into contact with a member to be fastened.
- a fastening member rod-shaped member having a peripheral portion made of a high-strength aluminum alloy and having a core portion whose radial thickness is 1/2000 to 1/10 of the maximum outer diameter of the outer peripheral portion.
- FIG. 9 is a side view showing the configuration of the fastening member according to Embodiment 3 of the present invention.
- FIG. 10 is a cross-sectional view that passes through the central axis in the longitudinal direction (left-right direction in FIG. 9) of the fastening member shown in FIG.
- the fastening member 6 shown in these drawings is a rivet made of a clad material formed by joining two different types of aluminum alloys.
- the fastening member 6 includes a columnar shaft portion 7, a head 8 provided at one end in the height direction (left and right direction in FIG. 9) of the column forming the shaft portion 7, and a boundary between the shaft portion 7 and the head 8. And a neck portion 9.
- the shape (round shape) of the head 8 shown in FIG. 9 is merely an example, and may have other shapes (dish shape or the like).
- the fastening member 6 includes a first alloy part 6a and a second alloy part 6b that are formed using two different types of aluminum alloys.
- the 1st alloy part 6a is provided in the part which contacts the member of fastening object. That is, the first alloy part 6a is at least one of the surface layer portion of the shaft portion 7, the surface of the neck portion 9, the surface layer portion of the seating surface 81 of the head portion 8, and the region connected to the seating surface 81 of the surface 82 of the head portion 8.
- the surface layer part of the part is configured.
- the second alloy portion 6 b constitutes a portion other than the inner peripheral side of the shaft portion 7 and the first alloy portion 6 a of the head portion 8.
- the first alloy part 6a is made of the same aluminum alloy as the first alloy part 1a of the first embodiment
- the second alloy part 6b is made of the same aluminum alloy as the second alloy part 1b of the first embodiment.
- the point that the thickness of the 1st alloy part 6a is 10 micrometers or more and 1.5 mm or less is the same as that of the 1st alloy part 1a.
- the radial thickness of the first alloy portion 6a in the shaft portion 7 is not less than 1/2000 and not more than 1/10 of the outer diameter r 3 of the shaft portion 7 (see FIG. 10).
- the point that the Vickers hardness of the second alloy part 6b is 170 or more and that the elongation at break of the second alloy part 6b at room temperature is 8% or more are the same as the second alloy part 1b.
- the thickness t 3 of the first alloy portion 6a of the shaft portion 7 is 1/2000 or less than 1/10 of the outer diameter r 3 of the shaft portion 7 (r 3/2000 ⁇ t 3 ⁇ r 3/10).
- Such a fastening member 6 can be formed by subjecting the rod-shaped member 100 shown in FIG. 4 to wire drawing or header processing.
- the first alloy part made of an aluminum alloy having excellent stress corrosion cracking resistance is provided in the part in contact with the member to be fastened, and the parts other than the above are strengthened.
- a fastening member having excellent strength and stress corrosion cracking resistance can be provided, as in the first embodiment.
- the outer peripheral side constitutes the rivet that is the first alloy part
- the radial thickness of the first alloy part in the shaft part of the rivet is 1/2000 or more of the outer diameter of the shaft part. Since it is 1/10 or less, it is possible to achieve both strength and stress corrosion cracking resistance in an appropriate balance.
- the hollow cylindrical shape is provided, and the portion that comes into contact with the member to be fastened is provided with the outer peripheral portion made of an aluminum alloy having excellent stress corrosion cracking resistance, and is covered with the outer peripheral portion without a gap.
- a rod-shaped member for a fastening member which is a clad material having a cylindrical shape and a core made of a high-strength aluminum alloy, the strength and stress corrosion cracking resistance can be achieved by the same manufacturing method as before. It is possible to form a fastening member (rivet) excellent in the above.
- the radial thickness of the outer peripheral portion of the fastening member rod-shaped member is 1/2000 or more and 1/10 or less of the diameter of the fastening member rod-shaped member.
- the strength and the stress corrosion cracking resistance can be balanced at an appropriate balance.
- the fastening member according to the present invention can be realized as a small screw or a tapping screw that is a male screw other than a bolt.
- a layer made of an aluminum alloy having further excellent stress corrosion cracking resistance can be provided on the surface of the first alloy part.
- Examples of such an aluminum alloy include 2000 series, 3000 series, 4000 series, and 5000 series aluminum alloys.
- the present invention can include various embodiments not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. Is possible.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Connection Of Plates (AREA)
- Insertion Pins And Rivets (AREA)
- Vehicle Body Suspensions (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
図1は、本発明の実施の形態1に係る締結部材の構成を示す側面図である。図2は、図1に示す締結部材の長手方向(図1の左右方向)の中心軸を通過する断面図である。これらの図に示す締結部材1は、互いに異なる2種類のアルミニウム(Al)合金を接合することによって形成されたクラッド材からなるボルト(雄ねじの一種)である。締結部材1は、円柱状をなす軸部2と、軸部2の軸線方向(図1の左右方向)の一端に設けられる頭部3と、軸部2と頭部3との境界をなす首部4とを備える。軸部2は、表面にねじ山21が形成されたねじ部22を有する。なお、図1に示す頭部3の形状(六角トリム型)はあくまでも一例に過ぎず、その他の形状(六角フランジ型、なべ型、皿型、トラス型、平型等)を有していても構わない。
図5は、本発明の実施の形態2に係る締結部材の構成を示す平面図である。図6は、図5のA-A線断面図である。これらの図に示す締結部材5は、互いに異なる2種類のアルミニウム合金を接合することによって形成されたクラッド材からなるナット(雌ねじの一種)である。締結部材5は、中空円柱状をなしており、中心部に形成される穴51の内面にねじ山52が形成されている。なお、図5に示す締結部材5の形状(六角ナット)はあくまでも一例に過ぎず、他の形状を有するナット(フランジ付ナット、袋ナット、高ナット等)として実現することも可能である。
図9は、本発明の実施の形態3に係る締結部材の構成を示す側面図である。図10は、図9に示す締結部材の長手方向(図9の左右方向)の中心軸を通過する断面図である。これらの図に示す締結部材6は、互いに異なる2種類のアルミニウム合金を接合することによって形成されたクラッド材からなるリベットである。締結部材6は、円柱状の軸部7と、軸部7をなす円柱の高さ方向(図9の左右方向)の一端に設けられる頭部8と、軸部7と頭部8との境界をなす首部9とを備える。なお、図9に示す頭部8の形状(丸型)はあくまでも一例に過ぎず、その他の形状(皿型等)を有していても構わない。
1a、5a、6a 第1合金部
1b、5b、6b 第2合金部
2、7 軸部
3、8 頭部
4、9 首部
21、52 ねじ山
21a 頂
21b 谷底
22 ねじ部
31、81 座面
32 側面
51、211’ 穴
82 表面
100、200、200’ 締結部材用棒状部材
101、201、201’ 芯部
102、202、202’ 外周部
Claims (10)
- 複数の部材を締結する締結部材であって、
亜鉛を0.005wt%以上5.0wt%以下含むとともに、マグネシウムを0.6wt%以上2.0wt%以下含むアルミニウム合金からなり、前記複数の部材の少なくともいずれか一つと接触する部分に設けられる第1合金部と、
マグネシウムを2.0wt%より大きく5.0wt%以下含むとともに、亜鉛を5.0wt%より大きく10wt%以下含むアルミニウム合金からなり、前記第1合金部に接合されてなる第2合金部と、
を備えたことを特徴とする締結部材。 - 前記第2合金部のビッカース硬さが170以上であることを特徴とする請求項1に記載の締結部材。
- 前記第1合金部の表面の一部にねじ山が形成されたことを特徴とする請求項1または2に記載の締結部材。
- 前記ねじ山が外周の少なくとも一部に形成された円柱状の軸部、該軸部の軸線方向の一端に設けられる頭部、および前記軸部と前記頭部との境界をなす首部を有する雄ねじであり、
前記第1合金部は、前記ねじ山の表層部分、前記首部の表面、および前記頭部の座面の表層部分を少なくとも構成し、
前記第1合金部のうち前記ねじ山の表層部分の径方向の厚さが前記軸部の最大外径の1/2000以上1/10以下であることを特徴とする請求項3に記載の締結部材。 - 中心部に形成される穴の内面に前記ねじ山が形成された雌ねじであり、
前記第2合金部は、前記第1合金部の外周側に位置し、
前記第1合金部の径方向の厚さが前記雌ねじの最大外径の1/2000以上1/10以下であることを特徴とする請求項3に記載の締結部材。 - 円柱状の軸部、該軸部の軸線方向の一端部に設けられる頭部、および前記軸部と前記頭部との境界をなす首部を有するリベットであり、
前記第1合金部は、前記軸部の表層部分、前記首部の表面、および前記頭部の座面の表層部分を少なくとも構成し、
前記軸部における前記第1合金部の径方向の厚さが前記軸部の外径の1/2000以上1/10以下であることを特徴とする請求項1または2に記載の締結部材。 - 円柱状をなし、マグネシウムを2.0wt%より大きく5.0wt%以下含むとともに、亜鉛を5.0wt%より大きく10wt%以下含むアルミニウム合金からなる芯部と、
前記芯部の側面を隙間なく被覆する中空円柱状をなし、亜鉛を0.005wt%以上5.0wt%以下含むとともに、マグネシウムを0.6wt%以上2.0wt%以下含むアルミニウム合金からなる外周部と、
を備えたことを特徴とする締結部材用棒状部材。 - 前記外周部の径方向の厚さは、前記外周部の最大外径の1/2000以上1/10以下であることを特徴とする請求項7に記載の締結部材用棒状部材。
- 中空円柱状をなし、亜鉛を0.005wt%以上5.0wt%以下含むとともに、マグネシウムを0.6wt%以上2.0wt%以下含むアルミニウム合金からなる芯部と、
前記芯部の側面を隙間なく被覆する中空円柱状をなし、マグネシウムを2.0wt%より大きく5.0wt%以下含むとともに、亜鉛を5.0wt%より大きく10wt%以下含むアルミニウム合金からなる外周部と、
を備えたことを特徴とする締結部材用棒状部材。 - 前記芯部の径方向の厚さは、前記外周部の最大外径の1/2000以上1/10以下であることを特徴とする請求項9に記載の締結部材用棒状部材。
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EP15764209.1A EP3121464B1 (en) | 2014-03-20 | 2015-03-20 | Fastening member, and rod-shaped member for a fastening member |
CN201580014107.4A CN106164504B (zh) | 2014-03-20 | 2015-03-20 | 紧固部件以及紧固部件用棒状部件 |
US15/126,698 US10294977B2 (en) | 2014-03-20 | 2015-03-20 | Fastening member and rod-like member for fastening member |
JP2016508845A JP6378317B2 (ja) | 2014-03-20 | 2015-03-20 | 締結部材および締結部材用棒状部材 |
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US10591011B2 (en) | 2015-06-29 | 2020-03-17 | Nhk Spring Co., Ltd. | Elastic member and wire for elastic member |
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CN107923429B (zh) * | 2015-08-28 | 2020-07-28 | 日本发条株式会社 | 紧固部件以及紧固部件用棒状部件 |
CN109306989A (zh) * | 2017-07-28 | 2019-02-05 | 宜兴市韦德同机械科技有限公司 | 一种电力杆用连接螺栓材料 |
EP3556875B1 (en) | 2018-04-18 | 2020-12-16 | Newfrey LLC | Fastener made of aluminium alloy comprising scandium |
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