WO2004085685A1 - 高強度ばねの製造方法 - Google Patents
高強度ばねの製造方法 Download PDFInfo
- Publication number
- WO2004085685A1 WO2004085685A1 PCT/JP2004/004106 JP2004004106W WO2004085685A1 WO 2004085685 A1 WO2004085685 A1 WO 2004085685A1 JP 2004004106 W JP2004004106 W JP 2004004106W WO 2004085685 A1 WO2004085685 A1 WO 2004085685A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spring
- strength
- shot
- strength spring
- heating step
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
-
- 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
- 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
-
- 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
Definitions
- the present invention relates to a shot peening method for manufacturing a spring (particularly a suspension spring) having excellent durability (fatigue resistance) and sag resistance.
- shot beaning has become an indispensable treatment especially for high-strength springs such as suspension springs for automobiles and valve springs for engines.
- Shotby Jung is a process in which small particles are projected onto the surface of an object to be processed. It differs greatly from the shot plasts, which are used for cleaning the surface by removing the scale (hard oxide film) formed on the surface, in terms of strength and other conditions. That is, the shot peening treatment is performed under the condition that only the surface of the spring is plastically deformed for the purpose of generating compressive residual stress on the surface of the spring.
- the main purpose of applying shot peening to a spring is to apply a compressive residual stress to the surface of the spring in advance, as described above, to reduce the applied stress during use of the spring by the residual stress. It is something to try. For this reason, various shot-by-Jung methods have been developed to increase the residual stress as much as possible.
- Japanese Patent Publication No. 48-20969 discloses that shot peening is applied to spring steel having a sorbite structure after quenching and tempering at a temperature of 200 to 400 ° C. The technology is disclosed.
- Japanese Patent Laid-Open No. 58-21838 / 25 discloses that during cooling after tempering heating, shot peening is performed while the temperature of the spring is 150 to 350 ° C. Is disclosed. Further, Japanese Patent Application Laid-Open No. 05-140643 discloses that after a temper treatment (quenching and tempering) is performed on steel having a predetermined composition, warm shot peening is performed while keeping the temperature at 150 to 300 ° C. A technique has been disclosed for generating a large compressive residual stress. The techniques described in JP-B-48-20969, JP-A-58-213825, and JP-A-05-140643 have been developed in a period when the operating stress of the spring is still low. At the moment when the operating stress is higher than at that time, it is difficult to say that the technology can sufficiently meet the required performance.
- the present invention has been made to solve such a problem, and an object of the present invention is to provide a method for manufacturing a high-strength spring capable of imparting a compressive residual stress that is even larger than before. Is to provide. Disclosure of the invention
- a method for manufacturing a high-strength spring according to the present invention which has been made to solve the above-described problem, includes subjecting the spring to shot behing while the spring has a surface temperature of 265 to 340 ° C. It is characterized by rapidly cooling the spring.
- the surface temperature of the spring during the shot peening is preferably 300 to 340 ° C., which is slightly higher than the above range.
- either water cooling or oil cooling may be used.
- forced air cooling may be used.
- the term “heating step” refers to the final caloric heat (tempering) step in a spring that is subjected to heat treatment (quenching / tempering), and refers to a cold calorie (coiling) in a spring that is not subjected to such heat treatment. Etc.) It refers to some kind of heating process, such as the subsequent strain relief annealing.
- the tempering heating is usually performed at a temperature of about 400 to 450 ° C.
- strain relief annealing is performed at a temperature of about 350 to 450 ° C.
- the above-described steps such as shot peening and setting within the above temperature range are sufficiently possible.
- heating may be performed separately from these heating steps, or the above-described shot beaning or the like may be performed while heating is maintained, not during cooling after heating.
- the hardness of the spring (work) with respect to the shot ball becomes relatively lower than when performing shot peung in the cold. For this reason, shot peening causes greater plastic deformation on the surface, increasing the value of the surface compressive residual stress, and generating the compressive residual stress from the surface to a deeper position.
- the spring was allowed to cool naturally after performing shot peening in a warm state. In the case of a wire rod having a diameter of 10 to 15 such as a suspension spring, the time required to decrease the temperature from 300 ° C. to 200 ° C., for example, exceeds 5 minutes. During such a long period of time at such a high temperature, the large compressive residual stress imparted is relaxed.
- the spring manufactured according to the present invention has higher durability.
- one of the purposes of performing warm setting is to generate plastic deformation (set) that may occur in future use at the time of manufacture and to generate dislocations that can cause plastic deformation. It is to fix in advance. When settling is performed in a warm state and then gradually cooled, such dislocations are likely to migrate again in a high temperature range. And cause future setbacks. However, by performing quenching immediately after warm setting as in the method according to the present invention, the dislocations are fixed stably, and the settling during subsequent use is minimized. To keep.
- the amount of compression of the spring for giving the same permanent deformation can be reduced in warm setting. This is effective in suppressing variations in the spring shape (free length and body bending) after setting.
- Fig. 4 is a graph showing the relationship between the set temperature at the outlet of the tempering furnace and the temperature of the workpiece (a), and the relationship between the free length after warm setting and (b).
- a coil spring was manufactured through the steps shown in Fig. 2.
- Fig. 3 shows the specifications of the manufactured coil spring.
- the experimental material was divided into two groups, and the spring (A) in one group was heat-treated (tempered) and the temperature of the spring was still in the range of 265-340 ° C.
- Setting warm setting
- shot peening warm shot pitching
- the other spring (B) of the group was allowed to cool naturally (air cooling) after setting and shot beaning.
- the shot pewing conditions were an arc height of 0.37 mm and a force rage of 100%.
- Tempering of a spring is performed by holding the quenched spring at a predetermined tempering temperature for a predetermined time, but in the spring manufacturing process for mass production, the tempering furnace is generally of a movable type.
- the temperature of the spring (work) during the above-mentioned warm shot peening and warm setting is set by appropriately setting the temperature near the outlet of the tempering furnace. It can be set arbitrarily. Therefore, the relationship between the set temperature at the outlet of the tempering furnace and the actual temperature of the spring (work) immediately after leaving the furnace was investigated. The results are shown in FIG. 4 (a). As can be seen from this figure, the higher the set temperature of the furnace outlet, the smaller the variation in workpiece temperature.
- Fig. 4 (b) also shows the relationship between the set temperature of the furnace outlet and the free length of the spring after warm setting. Similarly, the higher the set temperature at the outlet of the furnace, the smaller the variation in free length. This is due to the fact that in the case of warm setting, the amount of compression is small, so that the stress applied to the spring is reduced.
- the temperature at the outlet of the tempering furnace is set high, and the temperature of the spring during warm setting and warm shot peening is increased (265 ° C to 340 ° C, preferably 3 ° C). It can be seen that by performing the above process, the spring with less variation in shape can be manufactured.
- Fig. 5 shows the results of measuring the residual stress distribution of these three springs from the surface to the depth of 0.5 thigh.
- the maximum compressive residual stress exceeds 100 OMPa, and it has a stress value of 80 OMPa or more up to a depth of about 0.3 mm.
- the springs (cooling materials) of Group B were manufactured by changing the temperature at the start of shot peening to three types: 26.5 ° C, 30.5 ° C, and 3400 ° C.
- Figure 6 shows the results of measuring the residual stress distribution from the surface of these three types of springs in the same manner.
- the maximum compressive residual stress of all springs exceeds 100 OMPa, but the stress of 80 OMPa or more is 0.15 OMPa except for the spring treated at 265 ° C. It is about 0.20 mm.
- the shot peung may be performed a plurality of times. In addition, stress peening may be used if necessary.
- Fig. 7 shows the results of a corrosion durability test performed on the springs of both groups A and B. The test conditions are as described in the figure. It is clear from Fig. 7 that the springs that have been quenched after warm shot pinning and warm setting have improved durability compared to springs that have been cooled down.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Springs (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/546,833 US7699943B2 (en) | 2003-03-26 | 2004-03-24 | Method for manufacturing high-strength spring |
JP2005504086A JPWO2004085685A1 (ja) | 2003-03-26 | 2004-03-24 | 高強度ばねの製造方法 |
DE112004000474T DE112004000474B4 (de) | 2003-03-26 | 2004-03-24 | Verfahren zur Herstellung einer hochfesten Feder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-085194 | 2003-03-26 | ||
JP2003085194 | 2003-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004085685A1 true WO2004085685A1 (ja) | 2004-10-07 |
Family
ID=33095021
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/004106 WO2004085685A1 (ja) | 2003-03-26 | 2004-03-24 | 高強度ばねの製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7699943B2 (ja) |
JP (1) | JPWO2004085685A1 (ja) |
CN (1) | CN100582254C (ja) |
DE (1) | DE112004000474B4 (ja) |
WO (1) | WO2004085685A1 (ja) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006281343A (ja) * | 2005-03-31 | 2006-10-19 | Jfe Steel Kk | 厚鋼板の温間ショットピーニング方法 |
WO2011058706A1 (ja) * | 2009-11-11 | 2011-05-19 | 日本発條株式会社 | 減圧弁装置 |
CN102134633A (zh) * | 2011-01-20 | 2011-07-27 | 北京卫星制造厂 | 一种高精度弹性元件的精密化热处理方法 |
JP2011149036A (ja) * | 2010-01-19 | 2011-08-04 | Chuo Spring Co Ltd | 自動車懸架用コイルばねの製造方法及び自動車懸架用コイルばね |
JP2011247276A (ja) * | 2010-05-21 | 2011-12-08 | Nhk Spring Co Ltd | コイルばねの製造方法 |
WO2012063620A1 (ja) * | 2010-11-11 | 2012-05-18 | 日本発條株式会社 | 高強度ばね用鋼、高強度ばねの製造方法及び高強度ばね |
US8533954B2 (en) | 2009-06-17 | 2013-09-17 | Nhk Spring Co., Ltd. | Method for manufacturing a coil spring for vehicle suspension |
US8789817B2 (en) | 2009-09-29 | 2014-07-29 | Chuo Hatsujo Kabushiki Kaisha | Spring steel and spring having superior corrosion fatigue strength |
US9068615B2 (en) | 2011-01-06 | 2015-06-30 | Chuo Hatsujo Kabushiki Kaisha | Spring having excellent corrosion fatigue strength |
WO2015098182A1 (ja) * | 2013-12-24 | 2015-07-02 | 中央発條株式会社 | 懸架ばね及び懸架ばねの製造方法 |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101435476B (zh) * | 2007-11-15 | 2010-09-08 | 上海中国弹簧制造有限公司 | 增加负荷检测次数的弹簧生产工艺流程 |
JP5322744B2 (ja) * | 2009-04-03 | 2013-10-23 | 日本発條株式会社 | 圧縮コイルばねと、コイルばねの製造方法 |
JP5393281B2 (ja) * | 2009-06-17 | 2014-01-22 | 日本発條株式会社 | コイルばねの製造方法 |
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 |
JP5456396B2 (ja) * | 2009-07-13 | 2014-03-26 | 中央発條株式会社 | 皿ばね及びその製造方法 |
JP5550405B2 (ja) * | 2010-03-23 | 2014-07-16 | 中央発條株式会社 | ばねの製造方法 |
CN102338182A (zh) * | 2010-07-27 | 2012-02-01 | 上海中国弹簧制造有限公司 | 汽车悬架弹簧生产工艺 |
KR101219837B1 (ko) | 2010-10-19 | 2013-01-08 | 기아자동차주식회사 | 차량 엔진용 고강도 밸브 스프링의 제조 방법 및 이에 의해 제조된 차량 엔진용 고강도 밸브 스프링 |
CN102312180A (zh) * | 2011-08-31 | 2012-01-11 | 苏州热工研究院有限公司 | 一种提高镍基合金产品抗应力腐蚀性能的表面处理方法 |
CN102443686A (zh) * | 2012-01-09 | 2012-05-09 | 东风汽车悬架弹簧有限公司 | 钢板弹簧的表面喷丸强化方法 |
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 |
EP2840159B8 (de) * | 2013-08-22 | 2017-07-19 | ThyssenKrupp Steel Europe AG | Verfahren zum Herstellen eines Stahlbauteils |
US9778325B2 (en) * | 2014-07-29 | 2017-10-03 | Infineon Technologies Ag | Sensor with micro break compensation |
CN106498142A (zh) * | 2015-09-07 | 2017-03-15 | 南京工程学院 | 一种高强度变截面簧片制造中的应力喷丸方法 |
CN106011629A (zh) * | 2016-07-06 | 2016-10-12 | 安徽红桥金属制造有限公司 | 一种高强度韧性的汽车悬架弹簧钢及其制备方法 |
CN107746944A (zh) * | 2017-09-08 | 2018-03-02 | 常熟市瑞思知识产权服务有限公司 | 一种弹簧材料的复合优化处理工艺 |
US20210114116A1 (en) * | 2018-06-29 | 2021-04-22 | Ab Sandvik Coromant | Method of treating a cutting tool, and a cutting tool |
CN109722519A (zh) * | 2018-11-30 | 2019-05-07 | 天津市大港汽车配件弹簧厂 | 硬度在hrc45.3~49.1范围的汽车稳定杆热处理工艺 |
CN109664075A (zh) * | 2018-12-29 | 2019-04-23 | 无锡市锡达电子科技有限公司 | 一种斯特林发动机用同心蜗旋臂板弹簧的加工工艺 |
CN111168577A (zh) * | 2020-01-14 | 2020-05-19 | 诸暨市领诚信息技术有限公司 | 一种铜加工产品材料表面处理方法 |
CN112080623A (zh) * | 2020-08-12 | 2020-12-15 | 山东联美弹簧科技股份有限公司 | 轻量化高应力悬架弹簧强化生产工艺 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63267164A (ja) * | 1987-04-21 | 1988-11-04 | Tokyo Netsushiyori Kogyo Kk | シヨツトピ−ニングによる金属の表面処理方法及びその装置 |
JPH11241143A (ja) * | 1997-11-17 | 1999-09-07 | Chuo Spring Co Ltd | 耐腐食疲労強度を向上させたばね |
WO2000075381A1 (fr) * | 1999-06-08 | 2000-12-14 | Nhk Spring Co., Ltd. | Ressort haute resistance et procede de production associe |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4820969B1 (ja) | 1965-12-23 | 1973-06-25 | ||
JPS45241Y1 (ja) | 1966-06-11 | 1970-01-08 | ||
JPS58213825A (ja) * | 1982-06-08 | 1983-12-12 | Nhk Spring Co Ltd | ばね用鋼の強化方法 |
JPS61124521A (ja) * | 1984-11-22 | 1986-06-12 | Komatsu Ltd | 加工熱処理法 |
US5258082A (en) * | 1991-11-18 | 1993-11-02 | Nhk Spring Co., Ltd. | High strength spring |
JP3262352B2 (ja) | 1991-11-18 | 2002-03-04 | 日本発条株式会社 | 高強度ばねの製造方法 |
US6193816B1 (en) | 1997-11-17 | 2001-02-27 | Chuo Hatsujo Kabushiki Kaisha | Spring with corrosion fatigue strength |
-
2004
- 2004-03-24 WO PCT/JP2004/004106 patent/WO2004085685A1/ja active Application Filing
- 2004-03-24 US US10/546,833 patent/US7699943B2/en active Active
- 2004-03-24 CN CN200480008058A patent/CN100582254C/zh not_active Expired - Lifetime
- 2004-03-24 JP JP2005504086A patent/JPWO2004085685A1/ja active Pending
- 2004-03-24 DE DE112004000474T patent/DE112004000474B4/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63267164A (ja) * | 1987-04-21 | 1988-11-04 | Tokyo Netsushiyori Kogyo Kk | シヨツトピ−ニングによる金属の表面処理方法及びその装置 |
JPH11241143A (ja) * | 1997-11-17 | 1999-09-07 | Chuo Spring Co Ltd | 耐腐食疲労強度を向上させたばね |
WO2000075381A1 (fr) * | 1999-06-08 | 2000-12-14 | Nhk Spring Co., Ltd. | Ressort haute resistance et procede de production associe |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006281343A (ja) * | 2005-03-31 | 2006-10-19 | Jfe Steel Kk | 厚鋼板の温間ショットピーニング方法 |
US8533954B2 (en) | 2009-06-17 | 2013-09-17 | Nhk Spring Co., Ltd. | Method for manufacturing a coil spring for vehicle suspension |
US8936236B2 (en) | 2009-09-29 | 2015-01-20 | Chuo Hatsujo Kabushiki Kaisha | Coil spring for automobile suspension and method of manufacturing the same |
US8789817B2 (en) | 2009-09-29 | 2014-07-29 | Chuo Hatsujo Kabushiki Kaisha | Spring steel and spring having superior corrosion fatigue strength |
WO2011058706A1 (ja) * | 2009-11-11 | 2011-05-19 | 日本発條株式会社 | 減圧弁装置 |
JP2011149036A (ja) * | 2010-01-19 | 2011-08-04 | Chuo Spring Co Ltd | 自動車懸架用コイルばねの製造方法及び自動車懸架用コイルばね |
JP2011247276A (ja) * | 2010-05-21 | 2011-12-08 | Nhk Spring Co Ltd | コイルばねの製造方法 |
JP2012102378A (ja) * | 2010-11-11 | 2012-05-31 | Nhk Spring Co Ltd | 高強度ばね用鋼、高強度ばねの製造方法及び高強度ばね |
WO2012063620A1 (ja) * | 2010-11-11 | 2012-05-18 | 日本発條株式会社 | 高強度ばね用鋼、高強度ばねの製造方法及び高強度ばね |
US9404547B2 (en) | 2010-11-11 | 2016-08-02 | Nhk Spring Co., Ltd. | Steel for high-strength spring, method for producing same, and high-strength spring |
US9068615B2 (en) | 2011-01-06 | 2015-06-30 | Chuo Hatsujo Kabushiki Kaisha | Spring having excellent corrosion fatigue strength |
CN102134633B (zh) * | 2011-01-20 | 2012-06-13 | 北京卫星制造厂 | 一种高精度弹性元件的精密化热处理方法 |
CN102134633A (zh) * | 2011-01-20 | 2011-07-27 | 北京卫星制造厂 | 一种高精度弹性元件的精密化热处理方法 |
WO2015098182A1 (ja) * | 2013-12-24 | 2015-07-02 | 中央発條株式会社 | 懸架ばね及び懸架ばねの製造方法 |
Also Published As
Publication number | Publication date |
---|---|
DE112004000474T5 (de) | 2006-05-04 |
JPWO2004085685A1 (ja) | 2006-06-29 |
US20060060269A1 (en) | 2006-03-23 |
CN1764730A (zh) | 2006-04-26 |
US7699943B2 (en) | 2010-04-20 |
DE112004000474B4 (de) | 2013-02-21 |
CN100582254C (zh) | 2010-01-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2004085685A1 (ja) | 高強度ばねの製造方法 | |
JP5624503B2 (ja) | ばねおよびその製造方法 | |
EP1491647A1 (en) | Steel wire for hard drawn spring excellent in fatigue strength and resistance to settling, and hard drawn spring | |
JP2012077367A (ja) | コイルばね及びその製造方法 | |
JP5653022B2 (ja) | 腐食疲労強度に優れるばね用鋼、及びばね | |
JPH05177544A (ja) | コイルばねの製造方法 | |
JP5946238B2 (ja) | ベアリングレースの製造方法 | |
JPH06240408A (ja) | ばね用鋼線及びその製造方法 | |
JP4674843B2 (ja) | コイルばねの製造方法 | |
JP5597115B2 (ja) | 硬引き線、ばね、及び硬引き線の製造方法 | |
JP4261089B2 (ja) | 高強度・高耐疲労コイルばねの製造方法 | |
EP0630417A1 (en) | High strength steel sway bars and method of making | |
JP3634418B2 (ja) | コイルばねの製造方法及び高靭性・高抗張力コイルばね | |
JP5540433B2 (ja) | 耐へたり性と耐久性に優れたバネ及びその製造方法 | |
JP2004323912A (ja) | 高強度コイルばね及びその製造方法 | |
JP3780381B2 (ja) | 高強度コイルばねおよびその製造方法 | |
JP3555814B2 (ja) | コイルばね製造方法 | |
JPS63176430A (ja) | コイルスプリングの製造方法 | |
JP2835057B2 (ja) | ばね用鋼材とその製造方法 | |
JPS58193323A (ja) | 高強度ばねの製造法 | |
JP2006328473A (ja) | 非調質高強度ボルトの製造方法 | |
JPH05339763A (ja) | コイルばねの製造方法 | |
JPH02129422A (ja) | 高強度コイルばねおよびその製造方法 | |
JPH09143621A (ja) | 疲労特性に優れたばね用オイルテンパー線およびその製造方法 | |
JPH0672291B2 (ja) | 耐熱性、パテンチング処理性および弁ばね成形後の高温窒化処理特性の優れた弁ばね用高強度鋼線 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005504086 Country of ref document: JP |
|
ENP | Entry into the national phase |
Ref document number: 2006060269 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10546833 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20048080585 Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 10546833 Country of ref document: US |
|
DPEN | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101) | ||
122 | Ep: pct application non-entry in european phase |