WO2006030800A1 - 疲労特性に優れた高強度機械部品およびシャフト、ならびにそれらの疲労特性向上方法 - Google Patents
疲労特性に優れた高強度機械部品およびシャフト、ならびにそれらの疲労特性向上方法 Download PDFInfo
- Publication number
- WO2006030800A1 WO2006030800A1 PCT/JP2005/016881 JP2005016881W WO2006030800A1 WO 2006030800 A1 WO2006030800 A1 WO 2006030800A1 JP 2005016881 W JP2005016881 W JP 2005016881W WO 2006030800 A1 WO2006030800 A1 WO 2006030800A1
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- WO
- WIPO (PCT)
- Prior art keywords
- oil hole
- shaft
- strength
- notch
- residual stress
- Prior art date
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Classifications
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- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
Definitions
- the present invention is widely used in automobiles and various industrial machines.
- the present invention relates to a high-strength machine part having excellent fatigue characteristics such as a gear and a gear and a method for improving fatigue characteristics.
- the present invention relates to a high-strength mechanical component having a notch portion with a radius of curvature of 25 dragons or less and having a surface HV hardness of 250 or more and excellent fatigue properties, and a method for improving fatigue properties.
- the fatigue characteristics may not improve as the mechanical parts increase in strength.
- the effect of improving fatigue strength is small even if the strength is increased. This is because stress concentrates on the notch.
- the boundary between the arm and the pin or the shaft is a fillet V-shaped section with a rounded cross section.
- This fillet-shaped section is the torsional stress and bending response during rotation of the crankshaft. It is a place where power is easy to concentrate. For this reason, strengthening of the fillet portion has been carried out, and examples thereof include a P-hole processing method and a high-frequency quenching method.
- the roll processing method is a technique for improving the strength by cold working the pin Z flange and journal Z flange with a fillet roll.
- JP 2002-122126 A discloses a tensile stress A technology that relieves stress concentration by increasing the radius of curvature of such a portion
- Japanese Patent Laid-Open No. 2002-224920 introduces a technology that relieves stress concentration by suppressing the reduction of the shaft diameter of the fillet collar. ing.
- the induction hardening method is a technology that increases the strength of the pin, journal part, pin Z flange, and fillet part of the journal / flange boundary by martensitizing by induction hardening.
- Japanese Patent Application Laid-Open No. 2002-173711 introduces an induction hardening method and apparatus that hardly cause quench cracking.
- crankshafts and gearshafts used in automobile engines are subject to a large fluctuating load that accompanies the rotation of the engine and are required to have high strength.
- the oil hole provided in the shaft is drilled from various directions and is the weakest part in terms of strength.
- JP 2002-38220 A discloses induction hardening.
- a method is disclosed in which the strength around the oil hole is further increased and compressive residual stress is introduced into the surface of the oil hole, and when the crankshaft is rotated and heated with a half-release type high-frequency heating coil, the oil hole A method is disclosed in which the rotation is slowed down when the heat coil comes into contact with the heating coil, the heating layer in the vicinity of the oil hole opening is thickened, the quench hardening layer is deepened, and the area around the oil hole is strengthened.
- Japanese Patent Application Laid-Open No. 2002-160163 discloses a method of introducing work hardening and compression residual stress around the oil hole by using a shot beaning device specialized around the oil hole.
- shot peening is performed only around the oil hole without masking by rotating the projection nozzle around its central axis and shifting the projection hole opening direction with respect to the central axis of the nozzle.
- this method requires a cover to collect the shot sphere, which increases the cost of the device and increases the cost, and limits the size of the shot sphere. For this reason, it is difficult to apply a large compressive residual stress. Disclosure of the invention
- the present invention has been made in view of the actual situation as described above, and has a high-strength mechanical component having a fatigue characteristic having a notch portion with a curvature radius of 25 nun or less and a surface HV hardness of 250 or more, and its It is an object to provide a method for improving fatigue strength.
- the present invention adds a shaft that does not generate tensile residual stress to the “burning boundary” in the oil hole of the shaft, and a large compressive residual stress. It is an object of the present invention to provide a simple method for improving fatigue strength.
- the present inventors have made various studies on methods for improving the fatigue properties of high-strength mechanical parts having notches subjected to various heat treatments such as quenching / tempering treatment, carburizing treatment, and induction hardening treatment.
- various heat treatments such as quenching / tempering treatment, carburizing treatment, and induction hardening treatment.
- it is essential to apply compressive residual stress to the notch, and the conventional shot binning process is effective for the notch with a small radius of curvature. Clarified that it is difficult to apply compressive residual stress. Therefore, as a result of investigating various means to apply compressive residual stress instead of shot pinning, the ultrasonic impact treatment is extremely effective for introducing compressive residual stress, and the fatigue characteristics are greatly improved.
- the present invention adds a shaft that does not generate a tensile residual stress to a “burning boundary” or the like in the oil hole and adds a large compressive residual stress by applying an ultrasonic impact treatment to the oil hole portion.
- the present invention provides a simple method for improving fatigue strength.
- the gist of the present invention is as follows.
- It is a mechanical part having a notch portion with a curvature radius of 25 mm or less, made of a steel material containing C: 0.1 to 1.2% by mass%, and having a HV hardness of 250 on the steel material surface.
- the depth from the surface of the notch is at least 30 m.
- the high-strength mechanical component with excellent fatigue characteristics characterized in that the aspect ratio, which is the ratio of the major axis direction to the minor axis direction, is 1.5 or more. .
- the high-strength mechanical part described in (1) or (2) is a shuffling rod made of a steel material having a tensile strength of 800 MPa or more, the shaft has an oil hole, and the surface layer of the oil hole A shaft having excellent fatigue characteristics, characterized in that the compressive residual stress in is 50 to 90% of the tensile strength of the steel material, and further, the inner surface of the oil hole has an impact mark having a depth of 10 to 50 m.
- the shaft is further mass%, Cr: 0.1-2%, Ni: 0 • 1-2%, Mo: 0.1-2%, Cu: 0.1-2%, Ti: 0.003-0.05% ,
- V 0.05 to 0.5%
- Nb 0.01 to 0.1%
- B 0.0003 to 0.005% 1 type or 2 types or more
- a method for improving fatigue characteristics of a high-strength mechanical component which applies a compressive residual stress by hitting a notch of the high-strength mechanical component according to (1) or (2) with an ultrasonic vibrator.
- Hardness ratio of ultrasonic vibrator to mechanical parts 1.1 or higher, ultrasonic vibrator frequency: 10 to 60 kHz, ultrasonic output: 500 to 5000 W, pressing force on notch of ultrasonic vibrator: 10
- a method for improving the fatigue properties of high-strength machine parts characterized by subjecting the notch of the high-strength machine parts to ultrasonic hitting treatment under a condition of ⁇ 1000 N.
- FIG. 1 is a diagram illustrating a machine part having a notch used in an embodiment of the present invention.
- FIG. 2 is a diagram illustrating an embodiment in which the inner surface of the oil hole of the shaft according to the present invention is hit.
- FIG. 3 is a diagram illustrating an embodiment in which the inner surface of the oil hole of the shaft according to the present invention is hit.
- FIGS. 4 (a), (b), (c), and (d) are diagrams illustrating an embodiment in which the surface layer of the oil hole of the shaft is hit according to the present invention.
- C is an essential element for securing the strength of machine parts. However, if it is less than 0.1%, it is difficult to obtain the target HV hardness of 250 or more. Since the ductility of the parts decreases, the content is limited to the range of 0.1 to 1.2%.
- Alloy elements such as Si, Mn, Cr, Mo and Ni can be added depending on the heat treatment conditions and applications of various machine parts. Preferred ranges are: Si: 0.05 to 2.5%, Mn: 0.2 to 3%, Cr: 0.1 to 2.%, Mo: 0.1 to 3%, Ni: 0.1 to 2%, Cu: 0. 1 to 1%, B: 0.0003 to 0.005%.
- the preferred range of Al, N, Ti, Nb, V is A1: 0.005 to 0.1%, N : 0.001 to 0.02%, Ti: 0.003 to 0.05%, V: 0.05 to 0.5%, Nb: 0.01 to 0.1%.
- the preferable ranges of P and S are P: 0.015% or less and S: 0.05% or less.
- Si is effective as a strengthening element for steel, but there is no effect if it is less than 0.05%. On the other hand, if added in excess, the toughness and machinability deteriorate, so the upper limit of the amount added is 2.5%.
- Mn is an element effective for strengthening steel, but if it is less than 0.2%, a sufficient effect cannot be obtained. On the other hand, if added in excess, the toughness and machinability deteriorate, so the upper limit of the amount added is 2%.
- A1 is an effective element for deoxidation of steel and refinement of crystal grains, but less than 0.005% has no effect. On the other hand, if too much is added, the machinability decreases, so the upper limit of the amount added is 0.1%.
- N is an element necessary for precipitation strengthening by forming V carbonitride and Nb carbonitride, but if it is less than 0.001%, a sufficient effect cannot be obtained. On the other hand, if added too much, the toughness deteriorates, so the upper limit of the amount added is 0.02%.
- Cr, Ni, Mo, and Cu are elements that increase strength without sacrificing toughness when added in appropriate amounts. Cr, Ni, Mo, and Cu all have no effect if less than 0.1%, and if exceeding 2%, the toughness deteriorates greatly. Therefore, the lower limit of addition amount is 0.1% and the upper limit is 2%. To do.
- Ti is an effective element because it produces nitrides and carbides and increases strength due to precipitation strengthening. Furthermore, since Ti nitride remains without dissolving at high temperatures, it is effective in preventing austenite and coarsening during heating. If less than 0.003%, these effects do not appear, and if it exceeds 0.05%, the toughness deteriorates, so the lower limit of the amount added is 0.003% and the upper limit is 0.05%.
- V also produces nitrides and carbides as well as Ti, and strengthens by precipitation strengthening. It is an effective element because it rises, but in order to enjoy the effect, addition of 0.05% or more is necessary. On the other hand, since the toughness deteriorates when excessively added, the upper limit of the additive amount is set to 0.5%.
- Nb is also an effective element because it produces nitrides and carbides as well as Ti, and the strength is increased by precipitation strengthening. However, in order to enjoy the effect, sufficient effects are obtained at less than 0.01%. I can't. On the other hand, if added in excess, the toughness deteriorates, so the upper limit of the amount added is 0.1%.
- Pb, S, Bi, etc. may be added as elements for improving machinability, and such cases are also included in the present invention.
- the present invention can be applied to any steel structure such as ferri-toperlite steel, bainitic steel, martensite steel, etc., regardless of the structure or processing process of steel used for high-strength mechanical parts. It can be widely applied when it is cut after forging and is subjected to carburizing, induction hardening, quenching and tempering.
- the lower limit of the surface HV hardness is not limited. Limited to 250. If the compressive residual stress on the surface of the notch is less than 300 MPa, the effect of improving the fatigue strength is small. On the other hand, even if a compressive residual stress exceeding 1500 MPa is applied, the effect of improving the fatigue characteristics is saturated, so the surface layer of the notch The range of compressive residual stress was limited to one 300 to 1500 MPa.
- the residual stress of the present invention is determined by the X-ray method. It is measured.
- the aspect ratio between the major axis direction and the minor axis direction of the crystal grains is less than 1.5, and the effect of improving fatigue characteristics is insufficient.
- the lower limit of the ratio was limited to 1.5.
- the area of the aspect ratio of 1.5 or more is less than 30 m from the notch surface layer, it is difficult to obtain a sufficient fatigue strength improvement effect, so the lower limit was limited to 30 X m.
- the aspect ratio of crystal grains is measured with an optical microscope of 500 times.
- the structure of the machine part is ferrite-pearlite ⁇ , it is the average value of the ferrite grains and pearlite grains. If the microstructure is the main part, the average value of the pearlite grains, if it is martensite or tempered martensite ⁇ It is the average value of old austenite grains.
- the hardness of the ultrasonic vibrator is less than 1.1 times the hardness of the notch surface, it is difficult to efficiently apply compressive residual stress to the notch by ultrasonic striking treatment.
- the hardness ratio between the vibrator and machine parts was limited to 1.1 or higher.
- the radius of curvature of the tip of the ultrasonic transducer is not particularly limited, but if it is larger than the radius of curvature of the notch of the machine part, compressive residual stress cannot be applied efficiently. It is preferable that the tip radius of the vibrator be equal to or less than the radius of curvature of the notch. Since the compressive residual stress cannot be applied efficiently when the frequency of the ultrasonic vibrator is less than 10 kHz, the lower limit is limited to 10 kHz.
- the upper limit of the frequency is limited to 60 kHz.
- a preferable range of the frequency is 20 to 40 kHz. If the output power of the ultrasonic wave is less than 00W, the ultrasonic impact treatment time for applying the predetermined compressive residual stress becomes long and it is not economical, so the lower limit is limited to 500W. Even if the ultrasonic output exceeds 5000W, the effect is saturated, so 5000W was made the upper limit. If the pressing force on the notch of the ultrasonic transducer is less than 10 N, compressive residual stress cannot be applied efficiently and it is not economical, so the lower limit was limited to 10 N.
- the oil hole opened in the surface of the shaft is the origin of fatigue cracks due to the reduced cross-sectional area and the stress concentration shape.
- the fatigue strength of the oil hole determines the fatigue strength of the entire shaft.
- FIGS. 2 and 3 are diagrams illustrating an embodiment in which the inner surface of the oil hole of the shaft according to the present invention is struck, wherein 1 is an oil hole, 2 is an ultrasonic vibration terminal, and 3 is a hitting portion.
- the part subjected to the hitting treatment is targeted for the oil hole portion of the shaft because the fatigue failure is the main problem in the shaft because of the oil hole portion. If the location of fatigue cracks around the oil hole is known in advance, the area can be treated intensively.
- FIG. 3 is a diagram schematically illustrating how the ultrasonic vibration terminal 2 traces the inner surface of the oil hole 1. As shown in Fig. 3, the ultrasonic vibration terminal 2 ⁇ can be subjected to a striking treatment by oscillating while tracing the inner surface of the oil hole 1 over time.
- the striking portion on the inner surface of the oil hole 1 is not limited, but the oil hole corresponding to the “burning boundary” where tensile residual stress is generated by induction hardening or the like. It is preferable to work harden by hitting a position about 1 mm from the end of 1.
- FIG. 4 is a diagram illustrating an embodiment in which the surface layer of the oil hole of the shaft according to the present invention is struck, wherein 1 is an oil hole, 2 is an ultrasonic vibration terminal, and 3 is a striking portion.
- Fig. 4 (a) when the shaft is subjected only to bending fatigue as shown in Fig. 4 (a), it is preferable to hit the shaft in a direction perpendicular to the axis of the shuff h, as shown in Fig. 4 (c).
- Fig. 4 (c) When the torsion is subjected only to torsional fatigue, it is preferable to strike in a direction inclined 45 ° from the axial direction of the shaft.
- Fig. 4 (b) when the shaft is subjected to bending + torsional fatigue, it is preferable to strike the shaft by tilting them in a compound direction. If it is unclear whether the shape of the shuff ⁇ fracture is mainly bending fatigue or torsional fatigue, as shown in Fig. 4 (d), bending fatigue can also be applied to bending fatigue. Can also be dealt with.
- the shape of the tip of the ultrasonic hitting pin may be a hemispherical shape, a bowl shape, a bowl shape, or the like, but is not particularly limited.
- the projections and projections are brought together, so the processing may become unstable. The best is a saddle that combines convex and concave, but the cost of manufacturing an ultrasonic hitting pin can be high.
- the frequency of the ultrasonic vibrator used in the present invention is limited to 10 k to 60 kHz is that the compressive residual stress applied to the steel material increases in this region.
- the amplitude of the tip of the ultrasonically vibrating pin is 0.5-50; m This is because a sufficient compressive residual stress cannot be applied to the steel at an amplitude of less than 0.5 / m. Residual stress increases as the amplitude increases, but if it exceeds, the plastic deformation becomes too large, and the dimensional accuracy of the part decreases and the fatigue strength also decreases. Therefore, the upper limit of the amplitude is limited to 50 m.
- the impact treatment as described above is applied to the oil hole portion, so that the compressive residual stress in the surface layer of the oil hole of the shaft is 50% to 90% of the tensile strength of the steel material constituting the shaft. Must be%.
- a steel material with a tensile strength of 800 MPa or less has a sufficient fatigue strength improvement effect at 50%, which is the lower limit of the compressive residual stress in the oil hole. Therefore, the lower limit was set to 800MPa.
- Example 1 In steel materials with a strength of 800 MPa or more, which is the subject of the present invention, a sufficient fatigue strength improvement cannot be observed with a compressive residual stress of 50% or less of the tensile strength, and a compressive residual of 90% or more of the tensile strength. Since applying stress is difficult in the present invention, the upper limit is 90%.
- Example 1 In steel materials with a strength of 800 MPa or more, which is the subject of the present invention, a sufficient fatigue strength improvement cannot be observed with a compressive residual stress of 50% or less of the tensile strength, and a compressive residual of 90% or more of the tensile strength. Since applying stress is difficult in the present invention, the upper limit is 90%.
- Test Nos. 3, 5, 7, 8, 9, 12, 16, 18, 20, 21, 23, 2 5, 28, 32, 34, and 37 in Table 2 are examples of the present invention, and other examples are comparative examples. is there.
- all of the examples of the present invention impart a high compressive residual stress to the notch, and the aspect ratio of the crystal grains is 1.5 or more.
- a high-strength part having higher fatigue strength and superior fatigue characteristics than the comparative example has been realized.
- Test Nos. 1, 4, 6, 8, 11, 14, 1 7, 19, 22, 24, 27, 30, 33, and 35 which are comparative examples, are all notched after manufacturing the machine parts. This is a case where the residual stress control processing of the part is not performed. Since the compressive residual stress is low or the tensile residual stress is used, both are examples in which the fatigue strength is lower than that of the present invention.
- Test Nos. 2, 15, 31, and 36 which are comparative examples, were all subjected to conventional shot peening after the parts were manufactured. By performing shot pinning, the residual stress at the notch shifts to the compressive residual stress side, but since the radius of curvature of the notch is small, large compressive residual stress can be applied efficiently. Can not. As a result, the fatigue strength is inferior to the examples of the present invention in any of the examples.
- Test Nos. 10, 13, 26, 29, and 38, which are comparative examples are all examples in which the conditions of ultrasonic hitting treatment are inappropriate. In other words, No. 10 has a low hardness ratio between the ultrasonic transducer and machine parts, No. 13 has a low frequency of the ultrasonic transducer, and No.
- Example of the invention A 740 -1214 0.7 Carburizing treatment Tempered martensite 2. 2 1. 1 25 870 3000 569
- Example of the present invention B 726 -868 1.5 Carburizing treatment Tempered martensite 2. 0 1. 2 25 250 2000 416
- Example of the present invention C 753 -796 0.8 Carburizing treatment Tempering martensite 1.5 5 1. 2 28 785 2000 387
- Example of the invention H 484 -880 1. 4 Quenching and tempering Tempered martensite 2.5 5 1. 9 24 550 1500 389
- test piece was subjected to the ultrasonic treatment of the present invention, and a comparison material with no treatment or out-of-range treatment was prepared, and the Ono type rotating bending fatigue test was conducted to determine the fatigue strength.
- the results are shown in Table 4.
- the residual stress measurement values in Table 4 are the measurements of the residual stress on the surface layer of the joints prepared separately from specimens that were not subjected to fatigue tests. Residual stress is measured using X-rays, and the intensity of diffracted X-rays is measured and obtained from the half-value width of peak intensity.
- Samples without ultrasonic striking treatment have only a fatigue strength of less than 1 Z 4 in tensile strength. This is because the oil hole reduces fatigue strength. It is possible to improve the fatigue strength by increasing the strength around the oil hole by introducing an appropriate ultrasonic striking treatment and introducing compressive residual stress.
- the fatigue characteristics of a high-strength machine part having a notch with a radius of curvature of 25 mm or less are significantly improved by applying compressive residual stress by applying an ultrasonic impact treatment to the notch.
- the present invention it is possible to provide a shaft that does not generate a tensile residual stress in the “burning boundary” or the like in an oil hole, and a simple fatigue strength improving method that can apply a large compressive residual stress.
- the oil hole will not break and the reliability of the parts will increase.
- the weight of the parts corresponding to the strengthened parts can be reduced, contributing to improved fuel efficiency and cost reduction.
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Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2004-271853 | 2004-09-17 | ||
JP2004271853 | 2004-09-17 | ||
JP2004-295861 | 2004-10-08 | ||
JP2004295861A JP4436225B2 (ja) | 2004-10-08 | 2004-10-08 | 疲労特性に優れた高強度機械部品およびその疲労特性向上方法 |
JP2005-111627 | 2005-04-08 | ||
JP2005111627A JP4818632B2 (ja) | 2004-09-17 | 2005-04-08 | 耐疲労特性に優れたシャフトおよびその疲労特性向上方法 |
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Cited By (4)
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JP2013112826A (ja) * | 2011-11-25 | 2013-06-10 | Jfe Bars & Shapes Corp | 耐摩耗性と面疲労特性に優れた高周波焼入歯車およびその製造方法 |
JP2019183211A (ja) * | 2018-04-05 | 2019-10-24 | 日本製鉄株式会社 | 浸炭部品 |
JP2019183212A (ja) * | 2018-04-05 | 2019-10-24 | 日本製鉄株式会社 | 浸炭部品 |
US20210087645A1 (en) * | 2018-08-07 | 2021-03-25 | GM Global Technology Operations LLC | Crankshaft and method of manufacture |
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JP2000002229A (ja) * | 1998-06-17 | 2000-01-07 | Daido Steel Co Ltd | 高強度シャフト部品およびその製造方法 |
JP2000204432A (ja) * | 1999-01-12 | 2000-07-25 | Ntn Corp | 動力伝達軸 |
JP2003113418A (ja) * | 2001-10-04 | 2003-04-18 | Nippon Steel Corp | 疲労寿命向上処理法およびそれによる長寿命金属材 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2013112826A (ja) * | 2011-11-25 | 2013-06-10 | Jfe Bars & Shapes Corp | 耐摩耗性と面疲労特性に優れた高周波焼入歯車およびその製造方法 |
JP2019183211A (ja) * | 2018-04-05 | 2019-10-24 | 日本製鉄株式会社 | 浸炭部品 |
JP2019183212A (ja) * | 2018-04-05 | 2019-10-24 | 日本製鉄株式会社 | 浸炭部品 |
JP7063071B2 (ja) | 2018-04-05 | 2022-05-09 | 日本製鉄株式会社 | 浸炭部品 |
JP7063070B2 (ja) | 2018-04-05 | 2022-05-09 | 日本製鉄株式会社 | 浸炭部品 |
US20210087645A1 (en) * | 2018-08-07 | 2021-03-25 | GM Global Technology Operations LLC | Crankshaft and method of manufacture |
US11905992B2 (en) * | 2018-08-07 | 2024-02-20 | GM Global Technology Operations LLC | Crankshaft and method of manufacture |
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