WO2003055643A1 - Ressort a lames pour vehicule et son procede de fabrication - Google Patents
Ressort a lames pour vehicule et son procede de fabrication Download PDFInfo
- Publication number
- WO2003055643A1 WO2003055643A1 PCT/JP2002/012552 JP0212552W WO03055643A1 WO 2003055643 A1 WO2003055643 A1 WO 2003055643A1 JP 0212552 W JP0212552 W JP 0212552W WO 03055643 A1 WO03055643 A1 WO 03055643A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stress
- spring
- leaf spring
- peening
- shot
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S148/00—Metal treatment
- Y10S148/902—Metal treatment having portions of differing metallurgical properties or characteristics
- Y10S148/908—Spring
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/47—Burnishing
- Y10T29/479—Burnishing by shot peening or blasting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49863—Assembling or joining with prestressing of part
Definitions
- the present invention relates to a leaf spring for suspension of vehicles such as passenger cars, trucks, buses, and railways, and a method for manufacturing the same, and more particularly to a technique for improving durability as much as possible.
- leaf springs for vehicles are manufactured by forming spring steel, quenching and tempering, and then performing shot peening at room temperature.
- Shot pinning in this case is a process in which a steel shot is impacted at high speed on a surface on which tensile stress acts while the leaf spring is mounted on the vehicle. It can be generated to increase durability.
- spring steels used for leaf springs are generally SUP 6 (silicon manganese steel), SUP 9 or SUP 9 A (manganese chrome steel), and SUP 11 A (manganese chrome boron steel).
- the Brinell hardness after heat treatment of quenching and tempering is 388 to 461 HBW (2.85 to 3.10 mm in diameter of Brinell ball mark).
- SUP10 chromium vanadium steel
- HBW HBW
- FIG. 8 shows a leaf spring (1) with SUP 9 or SUP 9A, SUP11A steel grade heat treated and then subjected to shot peening at room temperature, and a stress spring peened with the same steel grade at room temperature after heat treatment.
- FIG. 11 is an SN diagram showing the results of endurance tests performed on a leaf spring (2) subjected to stress pinning after heat treatment with a SUP 10 steel grade. In this durability test, a stress (average stress) of 686 MPa was set on the leaf spring, and a stress amplitude was applied to the stress. As can be seen from Fig. 8, the number of endurance cycles is (1) ⁇ (2) and (3). The residual compressive stresses of leaf springs (2) and (3) were both 80 kgf Zmm 2 .
- SUP 10 when stress peening is performed using SUP 10, the durability is significantly improved.
- SUP 10 is expensive compared to SUP 6, SUP 9, etc., and thus has the disadvantage of increasing material costs. Disclosure of the invention
- the present invention provides a leaf spring and a method for manufacturing the same, which can obtain the same durability as that obtained by stress peening with SUP 9 using inexpensive materials such as SUP 9 and SUP 11. The purpose is.
- the method for manufacturing a leaf spring of the present invention has a Brinell hardness of 388 HBW or more and less than 555 HBW (Brinell ball scar diameter and a diameter of 3.1 Omm or more and less than 2.70 mm). While maintaining the spring body made of spring steel at 150 to 400 ° C, applying the first shot peening to the surface on which tensile stress acts while applying a load in the same direction as the usage state to the spring body. It is a feature.
- shot peening in the present invention may be referred to as warm stress peening.
- Fig. 1 is an SN diagram showing the number of endurance times of leaf springs made of spring steel with various hardness settings after quenching and tempering, which were subjected to warm stress peening. This warm stress peening is affected by the tensile stress of the leaf spring. C The was kept for a 2 50 to 300 ° C while applying a stress of 140 OMP a on a surface thereof, the durability test, the average stress 686 MP a, was performed by the stress amplitude to 720 MP a.
- HBD Brinell ball mark diameter
- the diameter is 3.10 mm or more and less than 2.7 Omm
- 100,000 times of durability is secured.
- HBD is represented by the diameter of the depression formed when a cemented carbide ball having a diameter of 1 Omm is pressed against the sample surface with a load of 3000 kgf. This is because when the hardness of the spring steel is HBD 2.7 Omm or more, the notch sensitivity increases and the durability variation increases, resulting in a decrease in the average durability.
- the material is hard, there is a problem that the shot of stress peening loses the hardness of the material. This means that processing by shot becomes difficult, and the compressive residual stress layer that is most effective in improving fatigue strength is not sufficiently formed, which also leads to an essential problem that fatigue strength is not improved.
- FIG. 4 is a diagram showing the results of measuring strain. As can be seen from Fig. 2, when the hardness of the spring steel is less than HBD 3.1 Omm, the residual shear strain increases sharply and the sag resistance decreases.
- Figure 3 shows the relationship between the depth from the surface of the material and the magnitude of the residual compressive stress when stress peening was performed using various steel grades and various holding temperatures after quenching and tempering.
- FIG. 3 the one subjected to warm stress peening at 150 ° C is a normal spring steel such as SUP9, but more stress-peened at SUP10 at room temperature. High compressive residual stress and deep depth. Furthermore, in the case of performing warm stress peening at 400 ° C, the residual compressive stress has increased dramatically, and the depth has been greatly increased. In contrast, stress peening was performed on ordinary materials at room temperature.
- the residual compressive stress was lower than that obtained by stress peening at room temperature with SUP10, and the residual compressive stress of ordinary material subjected to shot peening at room temperature was further reduced. Therefore, it can be seen that by performing the stress spinning while maintaining the material at 150 to 400 ° C., the number of times of durability can be increased even if the material is inexpensive.
- the holding temperature at the time of shot pinning is preferably 150 to 350 ° C, and more preferably 250 to 32 ° C.
- FIG. 1 is a graph showing the relationship between hardness and the number of breaks for explaining the operation of the present invention.
- FIG. 2 is a graph showing the relationship between hardness and residual shear strain for explaining the operation of the present invention.
- FIG. 3 is a graph showing the relationship between the distance from the surface and the residual compressive stress for explaining the operation of the present invention.
- FIG. 4 (A) is a side view showing a leaf spring according to the embodiment of the present invention
- FIG. 4 (B) is a rear view thereof.
- FIG. 5 is a diagram showing a manufacturing process of the leaf spring according to the embodiment of the present invention.
- FIG. 6 is an SN diagram in the embodiment of the present invention.
- FIG. 7 is another SN diagram in the embodiment of the present invention.
- FIG. 8 is an SN diagram of a conventional leaf spring.
- the first shot pinning After the first shot pinning, use a shot having an average particle diameter smaller than the average particle diameter of the shot used in the first shot pinning, and keep the spring body at 150 to 400 ° C.
- plastic deformation can be applied to the outermost surface of the spring body with a small-diameter shot, and the compressive residual stress at that portion can be increased to further improve the durability.
- the average particle size of the shot used in the first shot peening is 0.8 to 1.2 mm
- the average particle size of the shot used in the second shot peening is 0.2 to 0 It should be 6 mm.
- the present invention provides a leaf spring manufactured by the above manufacturing method, wherein residual compressive stress is distributed in a range of 0.4 to 0.6 mm from the surface on which tensile stress acts. , in which the maximum value of the residual compressive stress is equal to or is 800 ⁇ 1800 NZmm 2.
- Spring steels suitable for use in the present invention are SUP9, SUP11, and the like, and preferably have the composition shown in Table 1 below. Table 1
- FIG. 4 is a diagram showing a leaf spring of the embodiment.
- This leaf spring forms a mounting portion 2 by winding both ends of a spring body 1 that gradually becomes thinner from the center toward both sides, and a part such as a bracket is mounted on the center of the spring body 1. Holes 3 are formed.
- This leaf spring is formed into a curved shape shown by a dashed line in the figure, and in use, a load shown by W in the figure is applied in the direction of the arrow.
- FIG. 5 is a diagram showing a process for manufacturing the leaf spring as described above.
- the incoming material is inspected, cut into a plate of predetermined dimensions, and a hole 3 is machined in the center.
- the sheet material is heated and rolled so that both ends become gradually thinner.
- the end of the plate is mechanically worked so that the portion to be wound is gradually narrowed, and after heating, the end is wound to form the mounting portion 2.
- the semi-finished product of the leaf spring thus formed is curved after heating, and is put into a quenching tank and quenched. Thereafter, the semi-finished product is tempered, and then subjected to stress peening in a warm stress peening apparatus held in a warm region of 150 to 400 ° C. At this time, a load is applied to the semi-finished product by an appropriate jig in the direction indicated by the arrow in FIG. 4, and the semi-finished product is shot from the direction opposite to the arrow.
- the semi-finished product after natural cooling is painted, brackets and the like are assembled, and a plurality of semi-finished products are combined according to the specifications.
- the leaf spring assembly is set in such a way that a load exceeding the limit of its properties is applied in the direction of load during use. After painting and inspection, the leaf spring is completed.
- a warm stress peening device held in a warm region is used.
- a room temperature stress peening apparatus can also be used. That is, as shown by the two-dot chain line in Fig. 5, a special tempering device is installed immediately upstream of the normal temperature stress peening device, and the semi-finished product that has exited the tempering device is transported to the normal temperature stress pinning device before it cools down. You can also do stress peening. Alternatively, the semi-finished product that has exited the warm or room temperature stress peening device can be cooled by a cooling device in order to shorten the manufacturing time.
- a plate made of SUP 9 was formed into the shape shown in Fig. 4, quenched and tempered, and then subjected to warm stress peening. Warm stress peening was performed at 250-300 ° C while applying a stress of 1400 MPa to the surface of the leaf spring on which the tensile stress acts: Then, the leaf spring was subjected to an average stress of 686 MPa. The durability test was performed by setting various stress amplitudes. For comparison, a sheet material made of SUP10 was formed into the shape shown in FIG. 4, quenched and tempered, and then subjected to stress peening while applying a stress of 140 OMPa.
- FIG. 6 shows the results. As shown in FIG. 6, the leaf spring of the present invention subjected to the warm stress peening exhibited the same durability or more than that of the leaf spring subjected to the stress peening with SUP10.
- the leaf spring shown in FIG. 4 was manufactured using various spring steels. At that time, the leaf spring was subjected to one of shot peening at room temperature (SP), stress peening at room temperature (SSP), and warm stress peening (WSSP). In this case, shot peening at room temperature and stress peening at room temperature are performed while applying a stress of 900 MPa, warm stress pinning is performed while applying a stress of 1400 MPa, and warm stress peening is performed at 250 to 300 °. C.
- SP room temperature
- SSP stress peening at room temperature
- WSSP warm stress peening
- Fig. 7 shows the results.
- the dashed line in Fig. 6 shows the minimum value of the plot, although stress peening was performed at room temperature of SUP 10. Things. For those subjected to warm stress peening with S UP 9 and S UP 11, their plots are almost above or to the right of the dashed line, so they are equivalent to or better than those subjected to room temperature stress peening with SUP 10 It can be seen that the number of endurances is shown.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Springs (AREA)
- Heat Treatment Of Articles (AREA)
- Vehicle Body Suspensions (AREA)
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002349645A AU2002349645A1 (en) | 2001-12-26 | 2002-11-29 | Leaf spring for vehicle and method of manufacturing the leaf spring |
MXPA04006253A MXPA04006253A (es) | 2001-12-26 | 2002-11-29 | Resorte de hoja para vehiculo y metodo para fabricar el resorte de hoja. |
KR1020047009663A KR100772771B1 (ko) | 2001-12-26 | 2002-11-29 | 차량용 판 스프링 및 그 제조방법 |
ES02783707T ES2399388T3 (es) | 2001-12-26 | 2002-11-29 | Muelle de lámina para vehículo y método para producir el muelle de lámina |
EP02783707A EP1459846B1 (en) | 2001-12-26 | 2002-11-29 | Leaf spring for vehicle and method of manufacturing the leaf spring |
JP2003556208A JP4183129B2 (ja) | 2001-12-26 | 2002-11-29 | 車両用リーフスプリングおよびその製造方法 |
BRPI0215351-3A BR0215351B1 (pt) | 2001-12-26 | 2002-11-29 | feixe de molas para veìculo e método de fabricar o feixe de molas. |
US10/499,015 US7284308B2 (en) | 2001-12-26 | 2002-11-29 | Method for manufacturing a leaf spring |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001395058 | 2001-12-26 | ||
JP2001-395058 | 2001-12-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003055643A1 true WO2003055643A1 (fr) | 2003-07-10 |
Family
ID=19188933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/012552 WO2003055643A1 (fr) | 2001-12-26 | 2002-11-29 | Ressort a lames pour vehicule et son procede de fabrication |
Country Status (10)
Country | Link |
---|---|
US (1) | US7284308B2 (ja) |
EP (1) | EP1459846B1 (ja) |
JP (1) | JP4183129B2 (ja) |
KR (1) | KR100772771B1 (ja) |
CN (1) | CN100430249C (ja) |
AU (1) | AU2002349645A1 (ja) |
BR (1) | BR0215351B1 (ja) |
ES (1) | ES2399388T3 (ja) |
MX (1) | MXPA04006253A (ja) |
WO (1) | WO2003055643A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006071082A (ja) * | 2004-09-06 | 2006-03-16 | Horikiri:Kk | 板ばね及びその製造方法 |
JP2010185478A (ja) * | 2009-02-10 | 2010-08-26 | Nhk Spring Co Ltd | トーションバーおよびその製造方法 |
US8308150B2 (en) | 2009-06-17 | 2012-11-13 | Nhk Spring Co., Ltd. | Coil spring for vehicle suspension and method for manufacturing the same |
US8607605B2 (en) | 2009-06-17 | 2013-12-17 | Nhk Spring Co., Ltd. | Manufacturing method for coil spring |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1870612B2 (de) * | 2006-06-23 | 2012-08-08 | Muhr und Bender KG | Randschichtverbessern von Tellerfedern oder Wellfedern |
JP2009127123A (ja) * | 2007-11-28 | 2009-06-11 | Nhk Spring Co Ltd | 板ばね材及びその製造方法 |
JP5393280B2 (ja) * | 2009-06-17 | 2014-01-22 | 日本発條株式会社 | 車両懸架用コイルばねと、その製造方法 |
CN101829882B (zh) * | 2010-01-11 | 2012-01-25 | 安徽安簧机械股份有限公司 | 一种1800Mpa级以上高强度变截面簧片制造方法 |
JP5487012B2 (ja) * | 2010-06-07 | 2014-05-07 | 日本発條株式会社 | 板ばねの製造方法 |
CN101947558A (zh) * | 2010-08-30 | 2011-01-19 | 南京钢铁股份有限公司 | 一种高强度弹簧钢钢带的控温轧制方法 |
CN102896585A (zh) * | 2012-10-18 | 2013-01-30 | 山东雷帕得弹簧有限公司 | 生产高强度和高应力钢板弹簧的喷丸工艺 |
CN102922431B (zh) * | 2012-11-16 | 2015-03-04 | 上海交通大学 | 提高两相材料中低硬度高弹性物相表面强化的喷丸方法 |
CN103358234B (zh) * | 2013-07-19 | 2015-09-30 | 山东海华汽车部件有限公司 | 一种簧片余热应力喷丸工艺 |
CA2865630C (en) | 2013-10-01 | 2023-01-10 | Hendrickson Usa, L.L.C. | Leaf spring and method of manufacture thereof having sections with different levels of through hardness |
AT520621B1 (de) * | 2017-10-16 | 2023-04-15 | Hendrickson Comm Vehicle Sys Europe Gmbh | Federblatt und Verfahren zur Herstellung eines Federblattes |
CN111936762B (zh) * | 2018-03-28 | 2022-02-22 | 日本发条株式会社 | 板状弹簧部件 |
CN111349852A (zh) * | 2018-12-24 | 2020-06-30 | 新疆八一钢铁股份有限公司 | 用于生产55CrMnBA大截面弹扁连铸坯的方法 |
CN110079655A (zh) * | 2019-05-06 | 2019-08-02 | 苏州德格斯精密制造有限公司 | 一种高屈服弹簧的制造方法 |
JP7351720B2 (ja) * | 2019-11-12 | 2023-09-27 | 株式会社ミツトヨ | 反発係数測定機、及び硬さ測定機 |
CN111893285A (zh) * | 2020-07-15 | 2020-11-06 | 中国第一汽车股份有限公司 | 一种提高单片簧疲劳寿命和抗永久变形的复合强化方法 |
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US4909866A (en) * | 1987-09-25 | 1990-03-20 | Nissan Motor Co., Ltd. | High strength spring and its process of manufacturing |
US5225008A (en) * | 1991-11-18 | 1993-07-06 | Nhk Spring Co., Ltd. | Method for manufacturing a high-strength spring |
JP2000345238A (ja) * | 1999-03-31 | 2000-12-12 | Showa Corp | 自動車用懸架ばねの製造方法 |
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US959801A (en) | 1909-04-12 | 1910-05-31 | William A Pendry | Triple valve. |
US2249678A (en) * | 1940-08-28 | 1941-07-15 | Eaton Mfg Co | Apparatus for shot-blasting leaf springs |
US2252823A (en) * | 1940-09-28 | 1941-08-19 | Eaton Mfg Co | Apparatus for shot blasting leaf springs |
US3073022A (en) * | 1959-04-03 | 1963-01-15 | Gen Motors Corp | Shot-peening treatments |
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US3094768A (en) | 1961-03-29 | 1963-06-25 | Pangborn Corp | Spring peening |
US3238072A (en) * | 1963-06-12 | 1966-03-01 | Rockwell Standard Co | Method of making taper leaf springs |
JPH05148537A (ja) | 1991-07-11 | 1993-06-15 | Tougou Seisakusho:Kk | コイルばねの製造方法 |
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2002
- 2002-11-29 WO PCT/JP2002/012552 patent/WO2003055643A1/ja active Application Filing
- 2002-11-29 CN CNB028261801A patent/CN100430249C/zh not_active Expired - Lifetime
- 2002-11-29 US US10/499,015 patent/US7284308B2/en not_active Expired - Lifetime
- 2002-11-29 JP JP2003556208A patent/JP4183129B2/ja not_active Expired - Lifetime
- 2002-11-29 ES ES02783707T patent/ES2399388T3/es not_active Expired - Lifetime
- 2002-11-29 KR KR1020047009663A patent/KR100772771B1/ko active IP Right Grant
- 2002-11-29 MX MXPA04006253A patent/MXPA04006253A/es active IP Right Grant
- 2002-11-29 EP EP02783707A patent/EP1459846B1/en not_active Expired - Lifetime
- 2002-11-29 AU AU2002349645A patent/AU2002349645A1/en not_active Abandoned
- 2002-11-29 BR BRPI0215351-3A patent/BR0215351B1/pt active IP Right Grant
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US4909866A (en) * | 1987-09-25 | 1990-03-20 | Nissan Motor Co., Ltd. | High strength spring and its process of manufacturing |
US5225008A (en) * | 1991-11-18 | 1993-07-06 | Nhk Spring Co., Ltd. | Method for manufacturing a high-strength spring |
JP2000345238A (ja) * | 1999-03-31 | 2000-12-12 | Showa Corp | 自動車用懸架ばねの製造方法 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006071082A (ja) * | 2004-09-06 | 2006-03-16 | Horikiri:Kk | 板ばね及びその製造方法 |
JP4488347B2 (ja) * | 2004-09-06 | 2010-06-23 | 日本発條株式会社 | 板ばね及びその製造方法 |
JP2010185478A (ja) * | 2009-02-10 | 2010-08-26 | Nhk Spring Co Ltd | トーションバーおよびその製造方法 |
US8308150B2 (en) | 2009-06-17 | 2012-11-13 | Nhk Spring Co., Ltd. | Coil spring for vehicle suspension and method for manufacturing the same |
US8533954B2 (en) | 2009-06-17 | 2013-09-17 | Nhk Spring Co., Ltd. | Method for manufacturing a coil spring for vehicle suspension |
US8607605B2 (en) | 2009-06-17 | 2013-12-17 | Nhk Spring Co., Ltd. | Manufacturing method for coil spring |
Also Published As
Publication number | Publication date |
---|---|
US7284308B2 (en) | 2007-10-23 |
CN1607995A (zh) | 2005-04-20 |
EP1459846A4 (en) | 2010-10-20 |
AU2002349645A1 (en) | 2003-07-15 |
US20050028902A1 (en) | 2005-02-10 |
BR0215351A (pt) | 2004-12-14 |
EP1459846B1 (en) | 2012-11-14 |
JP4183129B2 (ja) | 2008-11-19 |
KR100772771B1 (ko) | 2007-11-01 |
CN100430249C (zh) | 2008-11-05 |
ES2399388T3 (es) | 2013-04-01 |
BR0215351B1 (pt) | 2011-02-08 |
MXPA04006253A (es) | 2004-09-27 |
EP1459846A1 (en) | 2004-09-22 |
KR20040068303A (ko) | 2004-07-30 |
JPWO2003055643A1 (ja) | 2005-04-28 |
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