CN107420412A - It is in rolling contact and uses axle portion part - Google Patents

It is in rolling contact and uses axle portion part Download PDF

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Publication number
CN107420412A
CN107420412A CN201710294081.4A CN201710294081A CN107420412A CN 107420412 A CN107420412 A CN 107420412A CN 201710294081 A CN201710294081 A CN 201710294081A CN 107420412 A CN107420412 A CN 107420412A
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China
Prior art keywords
axle
workpiece
mentioned
rolling contact
outer peripheral
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Pending
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CN201710294081.4A
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Chinese (zh)
Inventor
吉田亘
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JTEKT Corp
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JTEKT Corp
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Publication of CN107420412A publication Critical patent/CN107420412A/en
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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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • 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
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/58—Oils
    • 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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F01L2305/02—Mounting of rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/18—Testing or simulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/01—Absolute values
    • 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
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/02—Mechanical properties
    • F16C2202/04—Hardness
    • 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
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
    • F16C2223/16—Hardening, e.g. carburizing, carbo-nitriding with carbo-nitriding
    • 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
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
    • F16C2223/18—Hardening, e.g. carburizing, carbo-nitriding with induction hardening
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/31—Axle

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Ocean & Marine Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rolling Contact Bearings (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

The present invention provides one kind and is in rolling contact with axle portion part, it is to be made up of high-carbon steel and using outer peripheral face as the axle portion part for being in rolling contact face being in rolling contact with other side's part, wherein, with being 1.1~1.6 weight % from a surface to the concentration of carbon in the range of 10 μm and nicarbing layer that nitrogen concentration is 0.05~0.6 weight %, the Vickers hardness on the surface of the outer peripheral face is 700~840HV, the Vickers hardness of central part is below 600HV, on the surface from the outer peripheral face into the Vickers hardness of the central part, the maximum Smax of the absolute value of slope S in the change of above-mentioned Vickers hardness is 100~340HV/mm.

Description

It is in rolling contact and uses axle portion part
In the disclosure for the Japanese patent application 2016-090736 that on April 28th, 2016 proposes, including its specification, accompanying drawing And summary is all incorporated herein as reference.
Technical field
The present invention relates to be in rolling contact with what other side's part was in rolling contact with axle portion part.
Background technology
In the rocking arm that the valve system of motor car engine etc. uses, the roller type rocking arm for possessing rocking arm roller be present. In roller type rocking arm, rocking arm is rotatably assembled in via axle with the rocking arm roller of cam contact.Such rocking arm shakes The inner peripheral surface of arm roller and the outer peripheral face of axle are in rolling contact.In order to prevent axle breakage and the rolling life-span of extending shaft, In the manufacturing process of the axle, it is proposed that steel are implemented with the scheme of modification.For example, in Japanese Unexamined Patent Publication 2008-63603 public affairs In report, it is proposed that via steel preparatory process, nicarbing process, refrigerating work procedure, high-frequency quenching process, tempering process and The manufacture method of the axle of finishing step.
However, there is following problem in the manufacture method that Japanese Unexamined Patent Publication 2008-63603 publications are recorded：Due to being heat-treated work Sequence is more, therefore manufacturing cost is high, moreover, the manufacture of axle needs the long period.On the other hand, the present inventor on other side's part The axle portion part (being in rolling contact with axle portion part) being in rolling contact, is carefully ground to extend the rolling life-span of the axle portion part Study carefully, the present invention is completed based on new design.
The content of the invention
An object of the present invention is to provide one kind and is in rolling contact with axle portion part, its make to be in rolling contact with axle portion part from The hardness of surface to inside is distributed as defined distribution, thus extends the rolling life-span being in rolling contact with axle portion part, and energy It is enough to be manufactured with low cost.
It is made up of high-carbon steel and using outer peripheral face as the present invention for being in rolling contact face being in rolling contact with other side's part A mode axle portion part structure on be characterised by, the axle portion part have from a surface to the concentration of carbon in the range of 10 μm The nicarbing layer for being 0.05~0.6 weight % for 1.1~1.6 weight % and nitrogen concentration, the Vickers on the surface of the outer peripheral face Hardness is 700~840HV, and the Vickers hardness of central part is below 600HV, on the surface from the outer peripheral face to the central part Vickers hardness in, the maximum Smax of the absolute value of the slope S in the change of the Vickers hardness is 100~340HV/mm.
Brief description of the drawings
Before address feature of the invention and advantage described later by the explanation of following embodiment and referring to the drawings And it is clear and definite, wherein, identical label represents identical part.
Fig. 1 (a) is represent to have used the embodiment of invention one that is in rolling contact the roller type rocking arm with axle portion part The front view divided.
Fig. 1 (b) is Fig. 1 (a) line A-A sectional view.
Fig. 2 (a) is the stereogram being in rolling contact with axle portion part shown in Fig. 1 (a), Fig. 1 (b).
Fig. 2 (b) is Fig. 2 (a) line B-B sectional view.
Fig. 3 is to schematically show being in rolling contact shown in Fig. 2 (a), Fig. 2 (b) to be distributed with the hardness of the section of axle portion part Figure.
Fig. 4 is to manufacture the process chart for being in rolling contact the method with axle portion part shown in Fig. 2.
Fig. 5 is to represent to manufacture the outline of one for being in rolling contact the annealing device used during with axle portion part shown in Fig. 2 Illustrate figure.
Fig. 6 is the line chart for the heat treatment condition for representing embodiment 1.
Fig. 7 is the line chart for the heat treatment condition for representing comparative example 1.
Fig. 8 is the line chart for the heat treatment condition for representing comparative example 2.
Fig. 9 is the line chart for the heat treatment condition for representing comparative example 3.
Figure 10 is the line chart for the heat treatment condition for representing comparative example 4.
Embodiment
Hereinafter, being in rolling contact with axle portion part on embodiments of the present invention, is described with reference to the accompanying drawings.The present invention's It is the axle that rotates freely that being in rolling contact of embodiment can be used as the rocking arm roller bearing for possessing rocking arm by the use of axle portion part (rocking arm roller axle).Fig. 1 (a) is to represent to have used being in rolling contact for embodiments of the present invention to be shaken with the roller type of axle portion part The front view of a part for arm.Fig. 1 (b) is Fig. 1 (a) line A-A sectional view.Fig. 2 (a) is that being in rolling contact shown in Fig. 1 uses axle The stereogram of part.Fig. 2 (b) is Fig. 2 (a) line B-B sectional view.
As shown in Fig. 1 (a), (b), (below, also referred to as roller type rocking arm 1 possesses rocker arm body 10, rocking arm roller axle Axle) 11, the rocking arm roller 12 that is contacted with cam 2.Rocker arm body 10 possess in one side two a pair of forked wall portion 10A, 10B.Coaxial through hole 10C is respectively equipped with a pair of wall portions 10A, 10B.Axle 11 is embedded in above-mentioned through hole 10C, and axle 11 is fixed In wall portion 10A, 10B.Rocking arm roller 12 is configured between a pair of wall portions 10A, 10B, is assembled into and is rotated freely relative to axle 11. In such roller type rocking arm 1, the inner peripheral surface 12A of rocking arm roller 12 is in rolling contact with the outer peripheral face 11A of axle 11.To axle 11 Both ends 11B, 11C implement peening processing, thus axle 11 is fixed in a pair of wall portions 10A, 10B that rocker arm body 10 possesses.
Axle 11 is columned part such as shown in Fig. 2 (a), (b).Axle 11 is by high-carbon steel (the weight % of phosphorus content 0.7~1.1) Form, there is the nicarbing layer 11D handled by nicarbing to set in its skin section.Axle 11 is made up of high-carbon steel, because This sets nicarbing layer 11D in skin section, moreover, as described later from hardness distribution as defined in surface towards internal assign. Thereby, it is possible to effectively improve to roll the life-span.In contrast, for example, in the case of using mild steel, carburizing is set on surface Nitration case 11D, and even if from hardness distribution as defined in surface towards internal assign, also extremely lack the effect for improving and rolling the life-span Fruit.Therefore, axle 11 uses high-carbon steel.As above-mentioned high-carbon steel, as long as the weight % of phosphorus content 0.7~1.1 high-carbon steel, The high-carbon-chromium bearing steel such as SUJ2, SUJ3 can be used.
Axle 11 is provided with nicarbing layer 11D in skin section.Thus, the carbon amounts and nitrogen being dissolved near the skin section of axle 11 Amount increases.Therefore, the compressive residual stress increase on the surface of axle 11, with being difficult to breakage in being in rolling contact of rocking arm roller 12, It is capable of the rolling life-span of extending shaft 11.
Nicarbing layer 11D is 1.1~1.6 weight % from a surface to the concentration of carbon in the range of 10 μm.Above-mentioned carbon is dense If degree is less than 1.1 weight %, the intensity of the surface texture of axle 11 is insufficient, it is difficult to extends and rolls the life-span.On the other hand, when upper When stating concentration of carbon more than 1.6 weight %, in the surface texture of axle 11, thick carbide increase, crack produces starting point increase. Therefore, axle 11 is easily damaged, is also difficult to extend the rolling life-span in this case.
Nicarbing layer 11D is 0.05~0.6 weight % from a surface to the nitrogen concentration in the range of 10 μm.Above-mentioned nitrogen is dense If degree is less than 0.05 weight %, it is virtually impossible to be improved the effect for rolling the life-span.On the other hand, when above-mentioned nitrogen concentration exceedes During 0.6 weight %, the retained austenite scale of construction increases.As a result, the hardness on surface declines and rolls the lost of life.
The Vickers hardness on the outer peripheral face 11A of axle 11 surface is 700~840HV.The Vickers hardness on outer peripheral face 11A surface Less than 700HV, as with rocking arm roller 12 be in rolling contact be in rolling contact face and it is excessively soft, therefore can not expect The excellent rolling life-span.On the other hand, when the Vickers hardness on outer peripheral face 11A surface is more than 840HV, under the impact resistance of axle 11 Drop.The Vickers hardness on outer peripheral face 11A surface is preferably 720~840HV.Thereby, it is possible to significantly increase the rolling longevity of axle 11 Life.The Vickers hardness on outer peripheral face 11A surface is measured in the central portion of the length direction of axle 11.
The central part M of axle 11 Vickers hardness is below 600HV.The rolling life-span thus, it is possible to improve axle 11.In above-mentioned Center portion M Vickers hardness is preferably below 550HV.In this case, in axle 11, outer peripheral face 11A table can be substantially ensured that Face and central part M difference of hardness.Thereby, it is possible to significantly increase the rolling life-span of axle 11.Above-mentioned central part M Vickers hardness is excellent Elect more than 350HV as.If above-mentioned central part M Vickers hardness is less than 350HV, the compression strength of axle 11 may become not fill Point.
Fig. 3 is the figure of the hardness distribution for the section for schematically showing the axle 11 shown in Fig. 2.Fig. 3 show axle 11 from outer Side face 11A to above-mentioned central part M hardness distribution.It is hard to central part M Vickers on the surface from outer peripheral face 11A on axle 11 In degree, the maximum Smax of the absolute value of the slope S in the change of above-mentioned Vickers hardness (hereinafter also referred to as greatest gradient Smax) For 100~340HV/mm.As shown in figure 3, in axle 11, from outer peripheral face 11A surface towards above-mentioned central part M and Vickers hardness Decline.Now, for the rolling life-span of extending shaft 11, the slope S (HV/mm) in the change of above-mentioned Vickers hardness meets specific Important document is important.As described above, the greatest gradient Smax in the change of above-mentioned Vickers hardness is important for 100~340HV/mm 's.Such scope is in by greatest gradient Smax, and the long lifetime of axle 11 can be realized.
On the other hand, if above-mentioned greatest gradient Smax is less than 100HV/mm, significantly change in the absence of Vickers hardness Position, therefore compressive residual stress is small, can not extend and roll the life-span.When above-mentioned greatest gradient Smax is more than 340HV/mm, stretching Residual stress increases, and the intensity of axle 11 becomes insufficient.Therefore, axle 11 may can not be in early application.
Above-mentioned greatest gradient Smax is preferably 170~340HV/mm.Long lifetime of the scope particularly suitable for axle 11.
In the present invention, refer to will be supreme from outer peripheral face 11A surface for the slope S (HV/mm) in the change of Vickers hardness State the gradient for the coordinate diagram that the change of central part M Vickers hardness is marked and drawed as shown in Figure 3.The gradient (slope S) is usually taken to be negative Value.Above-mentioned slope S can obtain various values according to the depth apart from surface.Among the slope S changed according to depth, absolute value Maximum slope S is the maximum Smax (greatest gradient Smax) of the absolute value of slope S.
In the present invention, above-mentioned slope S is obtained by following methods.In the section of axle 11, to from outer peripheral face (0.1mm) is equally spacedly determined 11A to central part M Vickers hardness at a specific interval.Then, phase is made based on measured value For the distribution map of the Vickers hardness of depth, greatest gradient Smax is calculated based on the distribution map.Now, measuring point is obtained Slope between 2 points, the slope between each measuring point is compared to determine greatest gradient Smax.
In axle 11, on position (depth from the outer peripheral face 11A of axle 11) caused by above-mentioned greatest gradient Smax X, turn into 0.05~0.3 position preferably with respect to above-mentioned central part M depth d x/d.If 0.05, in axle 11 Outer peripheral face 11A near surface produces the change drastically of hardness.Therefore, the performance of axle 11 is unstable sometimes.On the other hand, During more than 0.3, above-mentioned Smax position depth is produced, the compressive residual stress on surface declines.Thus, axle 11 can not be realized sometimes Long lifetime.Radiuses of the central part M depth d equivalent to axle 11.
End face 11B, 11C of axle 11 Vickers hardness are 210~300HV.Therefore, end face 11B, 11C of axle 11 and periphery Face 11A is compared and can be easily plastically deformed.Therefore, as shown in figure 1, by being held back to end face 11B, 11C of axle 11 Tightly process and axle 11 can be fixed on rocker arm body 10.
The size of axle 11 is not particularly limited, it is preferred that a diameter of more than 3.5mm.Because the diameter of axle 11 is small If 3.5mm, above-mentioned hardness distribution can not be easily assigned from outer peripheral face 11A surface to central part M.Above-mentioned axle 11 Diameter is preferably below 30mm.When the diameter of axle 11 is more than 30mm, the rolling life-span of axle 11 and less improve sometimes.
Such axle 11 is following axle：It is distributed from hardness as defined in outer peripheral face 11A towards internal assign, and axle 11 End face 11B, 11C are soft, therefore have the excellent rolling life-span, and are processed by peening that can install.
Axle 11 can for example be manufactured by following methods.That is, can be manufactured by following manufacture method, the system Making method includes (a) to the work after the workpiece of shape shaft implements the process of nicarbing Quenching Treatment, (b) quenches to nicarbing Part implements temper, above-mentioned workpiece is immersed in coolant and in this case to above-mentioned workpiece progress sensing heating The process that process, (c) implement finishing to the workpiece after temper, in above-mentioned operation (b), by fixture by above-mentioned work Above-mentioned sensing heating is carried out in the state of the end face cladding of part.
Hereinafter, the method for manufacturing axle 11 is illustrated by process sequence.Fig. 4 is to manufacture being in rolling contact shown in Fig. 2 to use axle portion The process chart of the method for part (axle).
(1) first, carry out implementing the roughing such as forging, machining for the above-mentioned steel being made up of high-carbon steel and obtaining The preceding processing (being step S1 in Fig. 4) of raw material (workpiece) W1 with columned axle 11.
(2) next, implementing nicarbing Quenching Treatment for obtained workpiece W1 and obtaining on surface formed with carburizing The workpiece W2 (being step S2 in Fig. 4) of nitration case.Above-mentioned nicarbing Quenching Treatment is for example carried out with following conditions.It is logical Cross by workpiece W1 in the nicarbing atmosphere that carbon potential 1.1~1.3% and ammonia concentration are 2~7 volume %, with 850~900 DEG C Heating is kept for the stipulated time, then, is quenched to set point of temperature to carry out.
Carbon potential in above-mentioned nicarbing atmosphere is preferably 1.1~1.3%., can be to workpiece by being set to more than 1.1% W2 surface assigns sufficient hardness.By being set to less than 1.3%, the superfluous carburized structure on workpiece W2 surface can be suppressed Produce.
Ammonia concentration in above-mentioned nicarbing atmosphere is preferably 2~7 volume %., can by being set to more than 2 volume % Suppress the generation of superfluous carburized structure, and can improve for followed by temper caused by temper softening support Resistance.By being set to below 7 volume %, can prevent brittle caused by superfluous nitrogenize.
Heating keeping temperature in above-mentioned nicarbing atmosphere is preferably 850~900 DEG C.By being set to more than 850 DEG C, energy Enough form sufficient nicarbing layer.By being set to less than 900 DEG C, intrusion of the carbon of surplus into workpiece W1, suppression can be suppressed The generation of the superfluous carburized structure in W2 after nicarbing Quenching Treatment processed, and suppress the analysis of thick carbide, carbonitride Go out.
Above-mentioned heated hold time is not particularly limited, it is preferred that for more than 4 hours.Thereby, it is possible to obtain sufficiently Carburizing depth.Quenching after heating is for example carried out by the oil cooling in the oil bath of cooling oil.The oil bath temperature of cooling oil is usually 60~180 DEG C.The condition of above-mentioned nicarbing quenching can be changed suitably according to workpiece W1 size etc..
(3) next, implementing temper to the workpiece W2 after nicarbing Quenching Treatment, the W3 after temper is obtained (being step S3 in Fig. 4).Above-mentioned temper is for example by the state of workpiece W3 is impregnated in coolant, passing through sensing Heating carries out stipulated time heating, and then, workpiece W3 is cooled down to carry out in above-mentioned coolant.Above-mentioned workpiece W3 Cooling for example, by air cooling or can also let cool etc. to carry out.Now, workpiece W2 both ends of the surface are set to be coated by fixture in advance State, carry out sensing heating in this case.
In such temper, the temperature (outer peripheral face temperature) of workpiece W2 outer peripheral face can be made turn into than this The low temperature of the temperature (internal temperature) of workpiece W2 central part.Retained austenite during thereby, it is possible to suppress temper The reduction of the scale of construction, and increase compression stress.Now, above-mentioned outer peripheral face temperature and the difference of above-mentioned internal temperature (internal temperature-outer Side face temperature) it is preferably 40~600 DEG C., can be from workpiece W2 outer peripheral face direction by adjusting temperature difference within the range Center portion forms defined hardness distribution.When above-mentioned outer peripheral face temperature and the difference of above-mentioned internal temperature are more than 600 DEG C, workpiece W2 can It is able to can rupture.
In above-mentioned temper, tempering time is preferably less than 20 seconds.It is sufficient thereby, it is possible to be assigned to workpiece W2 Compressive residual stress.Preferred tempering time is less than 18 seconds.Above-mentioned tempering time is preferably more than 2 seconds, more preferably For more than 3 seconds.This is to be able to suppress the uneven generation of temperature and realize the stabilisation of the quality of product.In this embodiment party In formula, " tempering time " refers to conduction time during sensing heating.
The specific temperature of above-mentioned temper preferably so that outer peripheral face temperature turn into 170~290 DEG C and internal temperature into Mode for 320~715 DEG C is adjusted.Above-mentioned outer peripheral face temperature is preferably less than 275 DEG C.Its reason is more suitable for rolling The raising in life-span.Above-mentioned internal temperature is more preferably more than 365 DEG C, more preferably more than 450 DEG C.This is suitable for resistance to punching The reason that hitting property ensures.Above-mentioned internal temperature is more preferably less than 575 DEG C.This is suitable for the reason that compression strength ensures.On In the case of internal temperature is stated as 450~575 DEG C, more suitable for ensuring high-impact and compression strength.Above-mentioned outer peripheral face temperature Degree and above-mentioned internal temperature can be measured by the thermocouple of K types.The adjustment of above-mentioned temperature can pass through sensing Frequency, output, tempering time during heating etc. are carried out.
Above-mentioned temper is for example carried out using following annealing devices.Fig. 5 is represented shown in manufacture Fig. 2 It is in rolling contact the outline figure of one of the annealing device used during with axle portion part.Annealing device 100 shown in Fig. 5 has Standby treatment trough 101, holding jig 102, load coil 103, coolant 105, supply pipe 106.Treatment trough 101 is by quenching Workpiece W2 after reason is installed in inside, implements temper to workpiece W2.Holding jig 102 is kept to workpiece W2.Sensing Heating coil 103 configures the outer circumferential side in treatment trough 101, and sensing heating is carried out to workpiece W2.Coolant 105 accumulates in treatment trough It is the cooling medium cooled down to workpiece W2 in 101.Supply pipe 106 supplies coolant 105 into treatment trough 101.
Treatment trough 101 is the container for the bottomed cylindrical that can accumulate coolant 105.Said vesse by electrical insulating property pottery The synthetic resin of porcelain or electrical insulating property is formed.Thus, it is possible to suppress annealing device 100 heating of itself.Treatment trough 101 it is big It is small suitably to be set according to workpiece W2 size etc..Accumulate coolant 105 in treatment trough 101.It is provided with treatment trough 101 For the outside outlet 108 discharged by remaining coolant 105 to treatment trough 101.
Holding jig 102 is the part of the workpiece W2 for keeping being made up of thermal cement etc..Holding jig 102 is by workpiece W2 is kept into workpiece W2 length direction towards vertical.Holding jig 102 possesses lower clamp 102A and upper fixture 102B.Under Fixture 102A in a manner of the downside end face W2B for coating workpiece W2 to be kept.Upper fixture 102B is to coat workpiece W2 upside End face W2C mode is kept.
Lower clamp 102A possesses discoideus jig main body 112 and columned support shaft 113.Jig main body 112 coats Workpiece W2 downside end face W2B and kept.Support shaft 113 is arranged on the lower face side of jig main body 112, lower clamp 102A It is installed on the bottom for the treatment of trough 101.Opening is provided with into the downside end face W2B with workpiece W2 in the upper surface side of jig main body 112 The recess 112a at the shallow bottom of roughly the same shape.Lower clamp 102A by workpiece W2 downside end face W2B by being embedded in the recess 112a and keep workpiece W2.Upper fixture 102B possesses discoideus jig main body 122 and columned support shaft 123.Fixture master Body 122 coats workpiece W2 upside end face W2C and kept.Support shaft 123 is arranged on the upper surface side of jig main body 122, Upper fixture 102B is installed on the cap (not shown) that annealing device 100 possesses.It is provided with and opens in the lower face side of jig main body 122 Recess 122a of the mouth into the shallow bottom of shape roughly the same with workpiece W2 upside end face W2C.Upper fixture 102B is by by workpiece W2 Upside end face W2C be embedded in recess 122a and keep workpiece W2.
By using such holding jig 102, workpiece W2 can be maintained at the state being impregnated in coolant 105 Defined position in treatment trough 101.In the case where keeping workpiece W2 using holding jig 102, the two of workpiece W2 is not only End face, and nearby part is also wrapped by for workpiece W2 outer peripheral face W2A end face side, implements temper in this case.
Load coil 103 is arranged on the outside for the treatment of trough 101.Load coil 103 is that have than treatment trough 101 The big internal diameter of external diameter spiral helicine structure.In annealing device 100, by supplying electric current to load coil 103, Can be by workpiece W2 sensing heatings into desired temperature.Load coil 103 can be arranged in treatment trough 101.
Coolant 105 is the liquid that can be cooled down to workpiece W2 surface.As coolant 105, can enumerate Such as water, oil, water-soluble polymer etc..As above-mentioned oil, can enumerate such as quenching oil.As above-mentioned water-soluble polymer, The water-soluble quenching agent such as PAG (PAG) can be enumerated.Above-mentioned water-soluble polymer can be used to be used as and is dissolved in The aqueous solution of water.In this case, combined amount from water-soluble polymer to water can according to species of water-soluble polymer etc. and Appropriate setting.The high coolant of 105 preferred heet transfer rate of coolant, and more preferably handle easy coolant.This is can be high The reason efficient cooled down to workpiece W2 surface.
Supply pipe 106 has the function that to be used to supply coolant 105 into treatment trough 101, sets more.Supply pipe 106 Way partly possesses multiple nozzle 106a wherein, from nozzle 106a towards workpiece W2 spray cooling liquid.Therefore, supply pipe 106 Coolant 105, and the supply of the coolant 105 by using nozzle 106a are not only supplied into treatment trough 101, also can Accumulate in the stirring of the coolant 105 in treatment trough 101.Flow rate regulating valve and pressure-regulating valve are provided with supply pipe 106 (not shown).Thereby, it is possible to adjust the supply conditions of coolant 105.
In annealing device 100, the coolant 105 supplied via supply pipe 106 is accumulated in treatment trough 101, remaining Coolant 105 discharged from outlet 108.Annealing device 100 can possess for by the coolant 105 of discharge to treatment trough The circulation road (not shown) resupplied in 101.
In addition, although it is not shown, still annealing device 100 possesses power supply needed for sensing heating, integrator, for controlling Part needed for thermoregulation part of the temperature of cooling agent processed etc..Annealing device 100 can possess for protecting holding jig 102 The mechanism that the workpiece W2 held rotates around axle center.
As described above, keep workpiece W2 and being arranged in treatment trough 101 by holding jig 102, by workpiece W2 to impregnate Sensing heating is carried out used the temper of such annealing device 100 in the state of coolant 105.Thus, End face in the workpiece W2 coated by holding jig 102 both ends of the surface W2B, W2C and workpiece W2 outer peripheral face W2A nearby part with The state not connected with coolant 105 is heated, therefore implements temper with high temperature.On the other hand, workpiece W2 outer peripheral face The part not coated by holding jig 102 in W2A is heated with the state to connect with coolant 105, therefore with than by keeping The temperature that the part of the cladding of fixture 102 is low implements temper.Therefore, temper is carried out by using annealing device 100, Workpiece W2 end face and its hardness of neighbouring part can be made to turn into and can carry out the soft of peening processing, and make that workpiece W2's is outer The major part of side face is high rigidity.
Frequency and output during above-mentioned sensing heating can according to the cooling of workpiece W2 shape or size, coolant can etc. It is appropriately configured.For example, said frequencies can be set to 0.3~3kHz, above-mentioned output is set to 50~300kW.By with so Scope adjust frequency and output, the axle from outer peripheral face 11A towards central part M with above-mentioned hardness distribution can be obtained 11.The quantity delivered of the coolant 105 from nozzle 106a supplies during above-mentioned sensing heating is not particularly limited, but is set to for example 20~80L/min.Although the temperature of the coolant 105 of supply can wait also based on the cooling of coolant, if example Such as water-soluble polymer, then 20~40 DEG C are set to.
(4) finally, the finishing such as attrition process is implemented to the W3 for implementing temper (in Fig. 4, step S4).Pass through through By such process, locally-made axle 11 can be suppressed into.
The present invention is not defined to above-mentioned embodiment, can suitably be changed in the range of claims record.This The embodiment of invention is in rolling contact the axle that rocking arm roller is not defined to axle portion part.As long as rolled with other side's part The axle portion part of dynamic contact, for example, it is also possible to be used in interior axle (inner ring) of needle bearing etc. well.
In the temper for having used annealing device 100, it can only keep workpiece W2's by holding jig 102A The end face (for example, downside end face W2B) of one side carries out temper.In this case, the one side of axle 11 can only be made turn into energy Enough carry out the end face of the soft of peening processing.Being in rolling contact with axle portion part for embodiments of the present invention can be cylindric Axle portion part.In this case, it is in rolling contact the depth for the half for referring to the wall thickness from the surface of periphery with the central part of axle portion part Spend part.
Hereinafter, the action effect of the present invention is verified by embodiment etc..Embodiments of the present invention be not defined to Under embodiment.It is machined for the steel being made up of SUJ2 and obtains the columned of diameter 11mm × length 22mm Workpiece.Next, the nicarbing Quenching Treatment based on the heat treatment condition shown in table 1 and Fig. 6 is implemented to obtained workpiece And temper.Then, implement attrition process, obtain axle portion part.
Fig. 6 is the line chart for the heat treatment condition for representing embodiment 1.Here, nicarbing Quenching Treatment is by that will obtain Workpiece after carbon potential is 1.2% and ammonia concentration is that heated 4.5 hours with 860 DEG C in 3 volume % nicarbing atmosphere, Oil cooling is carried out into 80 DEG C.Temper installs the workpiece after Quenching Treatment in the annealing device 100 shown in Fig. 5 to enter OK.That is, kept in a manner of coating workpieces W2 both ends of the surface by fixture 102, the workpiece is immersed in the water-soluble of 25 DEG C of temperature Property quenching medium in, 3 seconds sensing heatings are carried out with frequency 1kHz, output 150kW and carried out.Now, from the cold of nozzle 106a But the quantity delivered of liquid is 60L/m.
The condition (frequency, output and time) of sensing heating during except temper will be carried out and from nozzle 106a Beyond the flow of the coolant of supply is changed as shown in table 1, axle portion part has been obtained similarly to Example 1.
In addition to having carried out Quenching Treatment and temper with following conditions, axle has been obtained similarly to Example 1 Part.Fig. 7 is the line chart for the heat treatment condition for representing comparative example 1.High frequency integral quenching has been carried out as Quenching Treatment.It is above-mentioned High frequency integral quenching with frequency 10kHz, output 23kW by carrying out 15 seconds sensing heatings to carry out.Enter as temper High frequency tempering is gone.Above-mentioned high frequency tempering with frequency 2kHz, output 50kW by carrying out 3 seconds sensing heatings to carry out.
It is machined for the steel being made up of SCr420 and has obtained the cylindric of diameter 11mm × length 22mm Workpiece.Quenched next, implementing the nicarbing based on the heat treatment condition shown in table 1 and Fig. 8 for obtained workpiece Processing and temper.Then, implement attrition process, obtain axle portion part.Fig. 8 is the heat treatment condition for representing comparative example 2 Line chart.Here, nicarbing Quenching Treatment is by being 1.1% in carbon potential by obtained workpiece and ammonia concentration is 3 volume % After having carried out heating in 4.5 hours in nicarbing atmosphere with 850 DEG C, oil cooling is carried out into 80 DEG C.Temper is returned by stove Fire is carried out.Above-mentioned stove tempering is by with 170 DEG C heat to carry out within 1.5 hours.
In addition to having carried out Quenching Treatment and temper in following methods, axle has been obtained similarly to Example 1 Part.Fig. 9 is the line chart for the heat treatment condition for representing comparative example 3.Integral quenching has been carried out as Quenching Treatment.Above-mentioned entirety After quenching with 840 DEG C by having carried out heating in 0.5 hour, oil cooling is carried out into 80 DEG C.Temper is except by sensing heating Condition (frequency, output and time) and from nozzle 106a supply coolant flow as shown in table 1 carried out change with Outside, carry out similarly to Example 1.
It is machined for the steel being made up of SCr420 and obtains the columned of diameter 11mm × length 22mm Workpiece.Next, the nicarbing Quenching Treatment based on the heat treatment condition shown in table 1 and Figure 10 is implemented to obtained workpiece And temper.Then, implement attrition process, obtain axle portion part.Figure 10 is the line for the heat treatment condition for representing comparative example 4 Figure.Here, nicarbing Quenching Treatment is by being 1.1% in carbon potential by obtained workpiece and ammonia concentration is oozing for 3 volume % After having carried out heating in 5 hours in carbon nitriding atmosphere with 850 DEG C, oil cooling is carried out into 80 DEG C.Temper by stove be tempered into OK.Above-mentioned stove tempering is by with 180 DEG C heat to carry out within 1.5 hours.
【Table 1】
Using Vickers pyramid hardness testing machine, the surface of the outer peripheral face in the axle portion part of measure embodiment 1~7 and comparative example 1~4 Vickers hardness and section the Vickers hardness from a surface to central part, obtained the Vickers hardness from above-mentioned surface to central part Distribution.Now, until the hardness of central part is determined on depth direction (radial direction) with 0.1mm intervals.Moreover, it is based on The distribution of the hardness of the section, determine greatest gradient Smax and greatest gradient Smax position x.As a result it is as shown in table 2.On Greatest gradient Smax position, " x/d (radius) " is calculated, as shown in table 2.
On embodiment 1~7 and the axle portion part of comparative example 1~4, determine from a surface to the concentration of carbon in the range of 10 μm And nitrogen concentration.As a result it is as shown in table 2.Above-mentioned concentration of carbon and above-mentioned nitrogen concentration are respectively by irradiating and determining electric wire to sample The method of the intensity of caused characteristic X-ray is determined.
Determine the rolling life-span of the axle portion part of embodiment 1~7 and comparative example 1~4.The above-mentioned rolling life-span passes through radial mode Life test machine is determined.As a result it is as shown in table 2.The rolling life-span calculates the phase as the measured value relative to comparative example 1 To value.
For embodiment 1~7 and the axle portion part of comparative example 1~4, it have rated and hold back close property.Hold back the evaluation of close property by using Drift peening and the experiment that links shaft end is carried out, if the situation for not producing rupture in the deflection that peening amount is 1.2mm is " 〇 ", the situation that can not be deformed or rupture is "×".As a result it is as shown in table 2.Moreover, calculate manufacturing cost, as than It is as shown in table 2 compared with the relative value of the figure of merit of the axle portion part of example 1.
【Table 2】
It can be seen from the result shown in table 2, the rolling life-span of the axle portion part of embodiment 1~7 is excellent.Understand especially in reality In the axle portion part for applying example 1~4, the rolling life-span significantly improves.Will also realize that the axle portion part of embodiment 1~7 can carry out holding back for end Tight processing.
The present invention's is in rolling contact with the axle portion part axle portion part that to be outer peripheral face be in rolling contact with other side's part, and rolls Life-span is excellent.

Claims (3)

  1. It is to be made up of high-carbon steel and be in rolling contact using outer peripheral face as with other side's part 1. one kind is in rolling contact with axle portion part The axle portion part for being in rolling contact face, it is characterised in that
    It is described to be in rolling contact that to have with axle portion part from a surface to the concentration of carbon in the range of 10 μm be 1.1~1.6 weight % and nitrogen Concentration is 0.05~0.6 weight % nicarbing layer,
    The Vickers hardness on the surface of the outer peripheral face is 700~840HV,
    The Vickers hardness of central part is below 600HV,
    On the surface from the outer peripheral face into the Vickers hardness of the central part, the slope S in the change of the Vickers hardness The maximum Smax of absolute value be 100~340HV/mm.
  2. 2. according to claim 1 be in rolling contact with axle portion part, wherein,
    The Vickers hardness on the surface of the outer peripheral face is 720~840HV, and the Vickers hardness of the central part is below 550HV.
  3. 3. according to claim 1 or 2 be in rolling contact with axle portion part, wherein,
    The Vickers hardness on the surface of the end face of at least one party is 210~300HV.
CN201710294081.4A 2016-04-28 2017-04-28 It is in rolling contact and uses axle portion part Pending CN107420412A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008063603A (en) * 2006-09-05 2008-03-21 Ntn Corp Method for manufacturing track member, method for manufacturing valve device, and track member
CN101400809A (en) * 2006-05-19 2009-04-01 日本精工株式会社 Rolling bearing
CN101490431A (en) * 2006-07-13 2009-07-22 Ntn株式会社 Process for producing track member, process for producing valve gear, and track member
CN102245793A (en) * 2008-12-12 2011-11-16 株式会社捷太格特 Constituent member of bearing, process for production of same, and ball-and-roller bearing provided with the constituent member

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080063603A1 (en) * 1990-04-02 2008-03-13 Bracco International B.V. Ultrasound contrast agents and methods of making and using them

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101400809A (en) * 2006-05-19 2009-04-01 日本精工株式会社 Rolling bearing
CN101490431A (en) * 2006-07-13 2009-07-22 Ntn株式会社 Process for producing track member, process for producing valve gear, and track member
JP2008063603A (en) * 2006-09-05 2008-03-21 Ntn Corp Method for manufacturing track member, method for manufacturing valve device, and track member
CN102245793A (en) * 2008-12-12 2011-11-16 株式会社捷太格特 Constituent member of bearing, process for production of same, and ball-and-roller bearing provided with the constituent member

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Application publication date: 20171201