WO2017002532A1 - 機械部品 - Google Patents

機械部品 Download PDF

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Publication number
WO2017002532A1
WO2017002532A1 PCT/JP2016/066601 JP2016066601W WO2017002532A1 WO 2017002532 A1 WO2017002532 A1 WO 2017002532A1 JP 2016066601 W JP2016066601 W JP 2016066601W WO 2017002532 A1 WO2017002532 A1 WO 2017002532A1
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WO
WIPO (PCT)
Prior art keywords
target material
processing target
sample
hardened
quenching
Prior art date
Application number
PCT/JP2016/066601
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English (en)
French (fr)
Japanese (ja)
Inventor
美有 佐藤
大木　力
Original Assignee
Ntn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 Ntn株式会社 filed Critical Ntn株式会社
Priority to EP16817641.0A priority Critical patent/EP3315625A4/en
Priority to CN201680038347.2A priority patent/CN107849655A/zh
Priority to US15/740,240 priority patent/US20180187280A1/en
Publication of WO2017002532A1 publication Critical patent/WO2017002532A1/ja

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    • 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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • 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
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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

Definitions

  • This invention relates to a machine part, and more particularly to a machine part having a hardened layer formed on a surface layer.
  • ECAP Equal Channel Angular Processing
  • the ECAP method is attracting attention as a high strain processing method in which the material shape does not change much before and after processing.
  • the ECAP method the amount of strain in one processing is not so large. Therefore, in order to express desired fine crystal grains and plasticity, the ECAP method must be processed a plurality of times, and there is a problem in terms of processing efficiency. Further, in the ECAP method, it is difficult to control the processing conditions. Because of such problems, it is difficult to use the ECAP method as an industrial technology.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2007-308806
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a steel mechanical part having high strength.
  • a mechanical component according to the present disclosure is a mechanical component made of steel having a carbon content of 0.2% by mass or more and 0.8% by mass or less, and includes a quench hardened layer formed on a surface layer, and is quenched. In the hardened layer, the particle size number of the prior austenite crystal grains is 11 or more.
  • a preparation step (S10) is performed.
  • a steel processing target material 1 (see FIG. 2) to be a machine part and a processing apparatus as shown in FIG. 2 are prepared.
  • the processing target material 1 may be processed into a schematic shape as a machine part.
  • the content of carbon in the material to be processed 1 may be 0.2% by mass or more. Any conventionally known method can be used as a processing method of the processing object 1.
  • the material which comprises the process target material 1 is steel, the thing of arbitrary compositions can be employ
  • the carbon content rate in the said material is 0.2 mass% or more.
  • the arbitrary shape can be employ
  • the shape (for example, rod shape) which has the long axis extended in a predetermined direction as shown, for example in FIG. 2 may be sufficient.
  • vertical to the major axis in the process target material 1 can be made into arbitrary shapes, for example, a circular shape may be sufficient.
  • a heat treatment step (S20) is performed.
  • this step (S20) in a state where shear strain is applied to the surface portion of the material 1 to be treated, the surface portion is quenched after being heated to a heating temperature equal to or higher than the A3 transformation point temperature.
  • the said heating temperature is 800 degreeC or more.
  • the cooling rate of the surface portion of the material to be treated in the quenching treatment is 35 ° C./second or more in the temperature range from 850 ° C. to 300 ° C.
  • a post-processing step (S30) is performed.
  • a final mechanical component is obtained by performing grinding processing, cleaning processing, or the like on the processing target material 1 on which the above-described heat treatment step (S20) is performed.
  • any conventionally known processing method can be used.
  • the structure of the processing apparatus used in the heat processing process (S20) mentioned above is demonstrated.
  • the processing apparatus performs induction heating with a rotating unit 4 that holds one end of the processing target material 1, a fixing unit 5 that fixes the other end of the processing target material 1, and induction processing.
  • the heating coil 2, the cooling nozzle 3 for performing the quenching process, the aligning panel 6, the cooling water circulation device 7, the power source 8, and the cooling water circulation device 9 for the power source 8 are mainly provided.
  • the rotating unit 4 is configured to be able to rotate so as to twist one end of the processing target material 1 with respect to the fixed unit 5.
  • the rotating unit 4 includes a rotating unit side holding unit that holds one end of the processing target material 1.
  • the configuration of the rotating unit side holding unit only needs to be able to detachably hold one end of the processing target material 1, and any conventionally known configuration can be adopted.
  • the rotating unit 4 may include a motor and a speed reducer, for example.
  • a driving device such as the motor described above may be connected to the rotation unit side holding unit via a reduction gear.
  • the rotating part-side holding part of the rotating part 4 is configured to be rotatable by the driving device described above.
  • the fixing unit 5 includes a fixing unit side holding unit that holds the other end of the processing target material 1.
  • the structure of the holding part side holding part is only required to be able to detachably hold the other end of the processing target material 1, and any conventionally known structure can be adopted.
  • the heating coil 2 is disposed so as to surround the outer periphery of the processing target material 1 held between the rotating unit 4 and the fixed unit 5.
  • the cooling nozzle 3 is disposed adjacent to the heating coil 2.
  • the cooling nozzle 3 is configured to be able to spray a cooling medium onto the processing target material 1.
  • a cooling medium for example, a liquid such as water or oil can be used.
  • the heating coil 2 and the cooling nozzle 3 are movable along the extending direction of the processing target material 1 (for example, the direction from the fixed portion 5 toward the rotating portion 4).
  • any conventionally known mechanism such as a fluid cylinder or an electric motor can be used.
  • the matching panel 6 includes a capacitor and a transformer, for example, and controls the heating state of the processing target material 1 by controlling the electric power supplied to the heating coil 2.
  • the matching panel 6 is connected to the heating coil 2 and the power source 8.
  • the power source 8 is a power source for high frequency induction heating, for example, and includes an inverter. As the configuration of the power supply 8 and the matching panel 6, any conventionally known configuration can be adopted.
  • the cooling water circulation device 7 supplies water, which is a cooling medium for cooling the heating coil 2, to the heating coil 2. Further, the cooling water circulation device 7 may supply water, which is a cooling medium for cooling the alignment plate 6, to the alignment plate 6. Further, the cooling water circulation device 7 supplies the cooling water sprayed from the cooling nozzle 3 to the processing target material 1 to the cooling nozzle 3.
  • the cooling water circulation device 9 supplies water, which is a cooling medium for cooling the power supply 8, to the power supply 8.
  • the above-described heat treatment is performed using the processing apparatus illustrated in FIG. Specifically, the processing target material 1 is fixed by the rotating unit 4 and the fixing unit 5. In this state, stress is applied to the processing target material 1 by the rotating unit 4 so that the processing target material 1 is rotated (twisted) about the rotation axis extending in the extending direction of the processing target material 1. At this time, since the other end portion of the processing target material 1 is fixed by the fixing portion 5, as a result, the outer peripheral surface of the processing target material 1 (side surface around the rotation axis described above) is twisted. Shear stress is applied.
  • the rotation speed when the rotation unit 4 is rotated relative to the fixed unit 5 may be 0.05 (rotation / second) or more. In this way, a sufficient shear strain can be generated on the surface of the material 1 to be processed.
  • the amount of shear strain applied to the surface of the processing target material 1 may be 7.1 or more.
  • the strain amount of the shear strain is defined as follows. That is, in the heat treatment step (S20) described above, the processing target material 1 is twisted (twisted) around the rotation axis (the long axis of the processing target material 1), and the processing target material is described later. When 1 is heated, a linear pattern extending along the circumferential direction is formed on the outer peripheral surface of the processing target material 1. An angle ⁇ between the extending direction of the linear pattern and the rotation axis is obtained by measurement. The amount of shear strain is defined as tan ⁇ .
  • the amount of shear strain can be adjusted, for example, by controlling the stress applied to the processing target material 1 from the rotating unit 4.
  • a conventionally well-known method of controlling the output of a driving device for example, a conductive motor for rotating the processing target material 1 in the rotating unit 4 can be used.
  • the surface of the processing target material 1 is induction-heated by the heating coil 2 disposed so as to surround the outer periphery of the processing target material 1.
  • the surface of the processing target material 1 is heated to a predetermined heating temperature not lower than the A3 transformation point.
  • the heating coil 2 and the cooling nozzle 3 move along the surface of the processing target material 1.
  • the moving direction of the heating coil 2 and the cooling nozzle 3 is the direction from the cooling nozzle 3 toward the heating coil 2 (the direction from the fixed portion 5 toward the rotating portion 4 in FIG. 2).
  • the cooling nozzle 3 is moved and arranged on the surface of the processing target material 1 heated by the heating coil 2.
  • a quenching process is performed on the surface of the processing target material 1 by spraying a cooling medium such as water from the cooling nozzle 3 onto the heated surface of the processing target material 1.
  • the moving speed of the heating coil 2 may be 0.5 mm / second or more.
  • the moving speed of the cooling nozzle 3 may be 0.5 mm / second or more.
  • the moving speed of the heating coil 2 and the moving speed of the cooling nozzle 3 may be the same.
  • the heating coil 2 and the cooling nozzle 3 may be integrated.
  • heating by the heating coil 2 and cooling (quenching process) by the cooling nozzle 3 are performed on the surface of the processing target material 1. , And can be sequentially performed from the fixed portion 5 side toward the rotating portion 4 side. Furthermore, the hardening process mentioned above is performed in the state which applied the force which twists the process target material 1 with the rotation part 4 to the said process target material 1, and added the shear strain to the surface of the process target material 1. For this reason, the prior austenite crystal grains in the quenched and hardened layer of the processing target material 1 after quenching can be refined.
  • FIG. 3 is a schematic cross-sectional view in a direction perpendicular to the major axis of the mechanical component 10.
  • the mechanical component 10 includes a hardened and hardened layer 11 formed on the surface layer, and a core portion 12 positioned on the inner peripheral side of the hardened and hardened layer 11.
  • regulated to JIS specification G0551 is 11 or more.
  • the machine part 10 is a machine part made of steel having a carbon content of 0.2% by mass or more and 0.8% by mass or less.
  • the hardened and hardened layer 11 has a higher hardness than the core 12.
  • the Vickers hardness in the hardened and hardened layer 11 may be 500 HV or higher, or 400 HV or higher.
  • the thickness of the quench hardening layer 11 can be 4 mm or more (for example, if the quench hardening layer 11 is defined as a region having a Vickers hardness of 400 HV or more).
  • the thickness of the quench hardening layer 11 can be determined by the method of calculating
  • the mechanical component 10 is a mechanical component made of steel having a carbon content of 0.2% by mass or more and 0.8% by mass or less, and includes a quench hardened layer 11 formed on a surface layer, In the quench hardened layer 11, the grain size number of the prior austenite crystal grains is 11 or more. In this case, the strength of the mechanical component 10 can be increased by refining the prior austenite crystal grains of the quenched and hardened layer 11.
  • the reason why the carbon content of the machine part is set to 0.2% by mass or more is to form a hardened and hardened layer by the quenching process. Moreover, the reason why the carbon content is set to 0.8% by mass or less is that it prevents burning cracks.
  • the lower limit of the carbon content may be 0.3% by mass or 0.35% by mass.
  • the upper limit of the carbon content may be 0.7% by mass or 0.6% by mass.
  • the prior austenite crystal grain may have a particle size number of 12 or more.
  • the thickness of the hardened hardening layer may be 4 mm or more (when a region having a Vickers hardness of 400 HV or more is used as the hardened hardening layer). In this case, since the hardened and hardened layer 11 having a sufficient thickness is formed on the surface layer of the mechanical component 10, the strength of the mechanical component can be reliably increased. In addition, the thickness of the said hardening hardening layer may be 4.5 mm or more, and may be 5 mm or more.
  • the Vickers hardness in the hardened and hardened layer 11 may be 500 HV or more. In this case, a mechanical component with high strength can be reliably obtained.
  • the Vickers hardness in the hardening hardening layer 11 may be 550HV or more, and may be 580HV or more.
  • the above-mentioned Vickers hardness of the hardened and hardened layer 11 means an average of measured values of Vickers hardness measured at a plurality of locations (for example, 5 points) in the depth direction of the hardened and hardened layer in the cross section of the mechanical component 10. To do.
  • the method for manufacturing a machine part includes a step of preparing a steel processing target material 1 to be a mechanical part (preparation step (S10)) and a state in which shear strain is applied to the surface portion of the processing target material 1 And a step (heat treatment step (S20)) in which the surface portion is quenched after being heated to a heating temperature equal to or higher than the A3 transformation point temperature.
  • the carbon content of the material 1 to be processed is 0.2% by mass or more.
  • the heating temperature is 800 ° C. or higher
  • the cooling rate of the surface portion of the processing target material 1 in the quenching process is 35 ° C./second or higher in the temperature range from 850 ° C. to 300 ° C. It is.
  • the reason why the heating temperature is set to 800 ° C. or higher is that the temperature of the surface portion of the processing target material 1 is surely set to a temperature equal to or higher than the A3 transformation point, and the quenching process is reliably performed.
  • the heating temperature may be 850 ° C. or higher, or 900 ° C. or higher.
  • the upper limit of heating temperature is good also as 1000 degreeC.
  • the cooling rate in the temperature range from 850 ° C. to 300 ° C., the cooling rate is set to 35 ° C./second or more because the quenching is incomplete when the cooling rate falls below 35 ° C./second. This is because there is a possibility of occurrence. In the temperature range from 850 ° C. to 300 ° C., the cooling rate may be 38 ° C./second or more, or 40 ° C./second or more.
  • the two parts of the processing target material 1 are held by the first and second holding parts (the rotating part 4 and the fixed part 5), respectively.
  • the first holding part (rotating part 4) is made the second holding part (fixing part 5) around the rotation axis from the first holding part (rotating part 4) to the second holding part (fixing part 5).
  • the shearing strain may be applied to the surface portion of the processing target material 1 by rotating it relative to the surface.
  • the shearing strain can be applied to the processing target material 1 by a relatively simple process of holding the two parts of the processing target material 1 and rotating the holding unit (rotating unit 4). For this reason, it can suppress that the manufacturing method of a machine component becomes complicated.
  • the rotation speed (twisting speed) when the first holding part (rotating part 4) is rotated relative to the second holding part (fixing part 5) is 0.05. It may be greater than (rotation / second).
  • the crystal structure (old austenite crystal grains) in the surface portion can be reliably refined.
  • the reason why the rotation speed is 0.05 (rotation / second) or more is that when the rotation speed is less than 0.05 (rotation / second), a sufficient shear strain is added to the surface portion of the material 1 to be processed. This is because there is a possibility that it cannot be done.
  • the rotation speed may be 0.07 (rotation / second) or more, or 0.1 (rotation / second) or more.
  • a part of the surface part may be heated and the part heated in the surface part may move.
  • the moving speed of the heated part may be 0.5 mm / second or more.
  • the work efficiency of the quenching process in the manufacturing method of the machine part can be sufficiently increased.
  • the above moving speed is set to 0.5 mm / second or more. If the moving speed is less than 0.5 mm / second, the work efficiency of the quenching process becomes too low, which may cause a practical problem. This is because The moving speed may be 0.7 mm / second or more, or 1 mm / second or more.
  • the amount of shear strain may be 7.1 or more in the step of quenching (S20).
  • the strain amount of the shear strain is set to 7.1 or more, there is a possibility that the refinement of the prior austenite crystal grains of the quenched and hardened layer may be insufficient when the strain amount is less than 7.1. Because it comes out.
  • the strain amount may be 7.5 or more, or 8 or more.
  • sample As a sample, a shaft made of carbon steel with a small amount of boron was used. Three types of samples ID1 to ID3 were prepared. The carbon content in the sample was 0.38% by mass. The sample has a cylindrical shape. The sample has a length of 500 mm and a cross-sectional diameter of 20.1 mm.
  • Heat treatment was performed on the samples ID1 to ID3 using the processing apparatus shown in FIG. Specifically, the sample was heated by high frequency induction heating using the heating coil 2. The surface of each sample was moved and quenched by moving the heating coil 2 and the adjacent cooling nozzle 3 along the axial direction of each sample. The moving speed of the heating coil 2 and the cooling nozzle 3 was 0.5 mm / second.
  • the surface temperature of the sample was heated to a heating temperature (900 ° C.) that is a temperature equal to or higher than the A3 transformation point, and then quenched to perform a quenching treatment.
  • a heating temperature 900 ° C.
  • the cooling rate was 37 ° C./second.
  • the heat treatment was performed by changing the conditions of each sample. Specifically, the sample ID1 was heat-treated without performing a twisting operation. For sample ID2, heat treatment was performed with the relative rotational speed (twisting speed) of the rotating part 4 with respect to the fixed part 5 being 0.025 (rotation / second). Sample ID3 was heat-treated at a rotation speed of 0.05 (rotation / second).
  • sample ID3 the amount of shear strain was measured.
  • the following method was used. That is, on the outer peripheral surface of the sample after heat treatment, a linear pattern extending along the circumferential direction is formed as shown in FIG. An angle ⁇ between the extending direction of the linear pattern and the long axis (rotation axis) of the sample was obtained by measurement. Then, tan ⁇ was calculated as the shear strain amount.
  • Vickers hardness was measured for a region from the surface to a depth of 200 ⁇ m. Specifically, Vickers hardness measurement was performed at five locations in the depth direction every 40 ⁇ m for the region from the surface to a depth of 200 ⁇ m in the cross section of each sample.
  • FIG. 4 shows external photographs of sample ID1 (upper side) heat-treated without twisting and sample ID3 (lower side) heat-treated while twisting at a rotational speed of 0.05 (rotation / second).
  • the sample ID 3 has a linear pattern extending in the direction indicated by the white dotted line (the circumferential direction that is the direction along the twisting direction).
  • Shear strain amount Sample ID3 had a shear strain of about 7.1.
  • Vickers hardness measurement As a result of Vickers hardness measurement for Sample IDs 1 to 3, the average value of Vickers hardness was 600 HV or more in the region from the surface to a depth of 200 ⁇ m. That is, in any sample, the region from the surface to a depth of 200 ⁇ m was quenched and hardened.
  • FIGS. 5 to 7 show the microstructures observed using an optical microscope after AGS corrosion on the cross sections of sample IDs 1 to 3, respectively.
  • FIG. 5 is a microstructural photograph of the cross section of Sample ID1.
  • the grain size number (see JIS standard G0551) of the prior austenite crystal grains in the sample ID1 shown in FIG.
  • the present invention is particularly advantageously applied to mechanical parts having a hardened and hardened layer formed on the surface.
  • Cooling water circulation device for supply, 8 High frequency induction heating power source (inverter), 9 Cooling water circulation device for cooling high frequency induction heating power source, 10 machine parts, 11 hardened hardened layer, 12 core part.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
PCT/JP2016/066601 2015-06-29 2016-06-03 機械部品 WO2017002532A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP16817641.0A EP3315625A4 (en) 2015-06-29 2016-06-03 Machine part
CN201680038347.2A CN107849655A (zh) 2015-06-29 2016-06-03 机械部件
US15/740,240 US20180187280A1 (en) 2015-06-29 2016-06-03 Mechanical component

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015129873A JP2017014550A (ja) 2015-06-29 2015-06-29 機械部品
JP2015-129873 2015-06-29

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WO2017002532A1 true WO2017002532A1 (ja) 2017-01-05

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US (1) US20180187280A1 (enrdf_load_stackoverflow)
EP (1) EP3315625A4 (enrdf_load_stackoverflow)
JP (1) JP2017014550A (enrdf_load_stackoverflow)
CN (1) CN107849655A (enrdf_load_stackoverflow)
WO (1) WO2017002532A1 (enrdf_load_stackoverflow)

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JP2004232669A (ja) * 2003-01-28 2004-08-19 Nsk Ltd 車輪支持用転がり軸受ユニット
WO2006008960A1 (ja) * 2004-07-16 2006-01-26 Jfe Steel Corporation 機械構造用部品およびその製造方法と高周波焼入れ用素材
JP2007177275A (ja) * 2005-12-27 2007-07-12 Jfe Steel Kk 等速自在継手用動力伝達シャフト
JP2007321197A (ja) * 2006-05-31 2007-12-13 Jfe Steel Kk 衝撃特性と疲労特性に優れた鋼軸部品とその製造方法
JP2009242923A (ja) * 2008-03-31 2009-10-22 Jfe Steel Corp 転動疲労特性に優れた機械構造用部品およびその製造方法
JP2009242918A (ja) * 2008-03-31 2009-10-22 Jfe Steel Corp 転動疲労特性に優れた機械構造用部品およびその製造方法
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

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JP2002275538A (ja) * 2001-03-15 2002-09-25 Toyota Motor Corp 鋼材の熱処理方法及び熱処理装置
JP2004232669A (ja) * 2003-01-28 2004-08-19 Nsk Ltd 車輪支持用転がり軸受ユニット
WO2006008960A1 (ja) * 2004-07-16 2006-01-26 Jfe Steel Corporation 機械構造用部品およびその製造方法と高周波焼入れ用素材
JP2007177275A (ja) * 2005-12-27 2007-07-12 Jfe Steel Kk 等速自在継手用動力伝達シャフト
JP2007321197A (ja) * 2006-05-31 2007-12-13 Jfe Steel Kk 衝撃特性と疲労特性に優れた鋼軸部品とその製造方法
JP2009242923A (ja) * 2008-03-31 2009-10-22 Jfe Steel Corp 転動疲労特性に優れた機械構造用部品およびその製造方法
JP2009242918A (ja) * 2008-03-31 2009-10-22 Jfe Steel Corp 転動疲労特性に優れた機械構造用部品およびその製造方法
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

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See also references of EP3315625A4 *

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EP3315625A1 (en) 2018-05-02
JP2017014550A (ja) 2017-01-19
EP3315625A4 (en) 2018-12-26
CN107849655A (zh) 2018-03-27
US20180187280A1 (en) 2018-07-05

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