WO2013046445A1 - Procédé de fabrication d'arbre à came pour moteur à combustion interne - Google Patents

Procédé de fabrication d'arbre à came pour moteur à combustion interne Download PDF

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Publication number
WO2013046445A1
WO2013046445A1 PCT/JP2011/072597 JP2011072597W WO2013046445A1 WO 2013046445 A1 WO2013046445 A1 WO 2013046445A1 JP 2011072597 W JP2011072597 W JP 2011072597W WO 2013046445 A1 WO2013046445 A1 WO 2013046445A1
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WO
WIPO (PCT)
Prior art keywords
cooling
camshaft
internal combustion
combustion engine
manufacturing
Prior art date
Application number
PCT/JP2011/072597
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English (en)
Japanese (ja)
Inventor
隆 舩橋
俊輔 竹口
Original Assignee
日本ピストンリング株式会社
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 日本ピストンリング株式会社 filed Critical 日本ピストンリング株式会社
Priority to PCT/JP2011/072597 priority Critical patent/WO2013046445A1/fr
Priority to KR1020147007129A priority patent/KR101539314B1/ko
Priority to PCT/JP2012/075109 priority patent/WO2013047761A1/fr
Priority to JP2013536432A priority patent/JP5988985B2/ja
Publication of WO2013046445A1 publication Critical patent/WO2013046445A1/fr

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Classifications

    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
    • 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
    • F16C3/023—Shafts; Axles made of several parts, e.g. by welding

Definitions

  • the present invention relates to a method for manufacturing a camshaft for an internal combustion engine, and more particularly to a method for manufacturing a camshaft formed by diffusion bonding a cam lobe made of sintered alloy powder and a steel shaft.
  • a camshaft for an internal combustion engine a cast iron camshaft integrally formed by casting, a sintered camshaft in which a sintered cam lobe is joined to a steel shaft, or the like has been used.
  • the cast iron camshaft is relatively inexpensive, there are problems in manufacturing such as difficulty in weight reduction and difficulty in forming the cam portion with high accuracy.
  • the cast iron camshaft can only use a castable material, and it is difficult to make the cam portion excellent in wear resistance. Therefore, in the case of a cast iron camshaft, wear characteristics such as pitting resistance and scuffing resistance are inferior, and it has been difficult to cope with high performance and light weight of an internal combustion engine.
  • the sintered camshaft can select an alloy component according to the performance required for the cam, and can hollow the shaft. For this reason, sintered camshafts with sintered cam lobes joined to steel shafts have high wear resistance, and are lighter camshafts that can withstand high surface pressures and high loads. It can be suitably used for the required internal combustion engine.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2001-271909
  • a shaft and assembly suitably used for an assembling camshaft formed by diffusion bonding a cam lobe made of sintered alloy powder and a shaft made of steel.
  • a method of manufacturing a camshaft is disclosed.
  • the camshaft of Patent Document 1 is formed by compacting a shaft obtained by subjecting a high carbon chromium bearing steel material to spheroidizing and annealing, and then drawing to a predetermined size, and sintered alloy powder.
  • a cam lobe formed on a compacted body of a predetermined size is manufactured, the cam lobe is assembled to the shaft, and they are manufactured by diffusion bonding.
  • Patent Document 1 in the manufacture of assembled camshaft, the cooling after passing through the sintering furnace, by going through the steps, especially the cooling rate in the vicinity of A 1 transformation point as 10 ⁇ 20 ° C. / min, It is disclosed that it is a pearlite-based matrix structure containing fine precipitated carbides (see paragraph 0024).
  • Patent Document 1 does not disclose any method for cooling the entire circumference of the camshaft uniformly at the same speed in the camshaft cooling process. If the entire circumference of the camshaft is not uniformly cooled at the same speed, the mechanical characteristics of the portions of the camshaft vary and the quality is degraded.
  • a sintering furnace used for manufacturing a camshaft generally includes a sintering device for sintering the camshaft and a cooling device for cooling the sintered camshaft.
  • the camshaft is horizontally transported in a state where it is mounted on a jig in a state where a plurality of mounting plates are stacked horizontally and stacked in a plurality of stages. Are processed.
  • forced cooling is often performed by circulating a cooling gas in the cooling processing chamber of the cooling device, but even if the cooling gas circulation rate is lowered,
  • the present invention does not cause individual differences in the cooling speed of the camshaft depending on the mounting position in the cooling device, and cools the entire circumference of the camshaft almost uniformly, thereby preventing pitting resistance and scuffing resistance. It is an object of the present invention to provide a method for manufacturing a camshaft for an internal combustion engine that can stably obtain the effect of improving wear characteristics such as the above.
  • a method of manufacturing a camshaft for an internal combustion engine includes a heat treatment step of heating a camshaft formed by assembling a sintered cam piece to a shaft body of a steel pipe to a sintering temperature by a heat treatment device;
  • a method of manufacturing a camshaft for an internal combustion engine comprising a cooling processing step of cooling the heat-treated camshaft by a cooling processing device.
  • a graphite plate provided around the cooling processing device is used.
  • the heat treatment step is preferably performed at a temperature controlled at a sintering temperature of 900 ° C. to 1120 ° C. ⁇ 10 ° C. during the sintering.
  • the first stage cooling process is performed at a cooling rate of 20 ° C./sec between 700 ° C. and 900 ° C.
  • the second stage cooling process includes a cooling rate of 0.5 to 5 ° C./sec from the temperature after completion of the first stage cooling process. It is preferable to cool at a rate of
  • the internal combustion engine camshaft manufacturing method in the cooling processing step, is subjected to a cooling process in a state of being loaded in a plurality of mounting jigs stacked in a plurality of stages. Is preferred.
  • the cooling treatment is performed in a state where the periphery of the sintered camshaft disposed in the cooling device is surrounded by the graphite plate. It is possible to provide a camshaft for an internal combustion engine in which the effect of improving wear characteristics such as scuffing is stably achieved.
  • FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1. It is front sectional drawing for demonstrating the cooling device of FIG.
  • a method for manufacturing a camshaft for an internal combustion engine a heat treatment step of heating a camshaft formed by assembling a sintered cam piece to a shaft body of a steel pipe to a sintering temperature with a heat treatment device;
  • a method of manufacturing a camshaft for an internal combustion engine comprising: a cooling processing step of cooling the heat-treated camshaft by a cooling processing device, wherein the cooling processing step is surrounded by a graphite plate provided around the cooling processing device.
  • FIG. 1 is a longitudinal sectional view for explaining a continuous sintering furnace used in the method for manufacturing a camshaft for an internal combustion engine according to the present invention.
  • FIG. 2 is a cross-sectional view taken along the line A-A ′ of FIG.
  • FIG. 3 is a longitudinal sectional view for explaining the cooling device of FIG.
  • a continuous sintering furnace 1 used in a method for manufacturing a camshaft for an internal combustion engine according to the present invention includes a vacuum standby chamber 2, a preheating device 3 for dewaxing, and a sintering device for sintering. 4 and the cooling device 5.
  • an inlet door 11 for carrying in the camshaft before processing and an outlet door 12 for carrying out the camshaft after processing are driven up and down by opening and closing devices 13 and 14, respectively. It has become.
  • Reference numerals 15 to 20 in the figure also indicate opening / closing devices, respectively, for driving up and down each door (not shown) partitioning each chamber.
  • a conveying roller 21 for conveying the camshaft W is provided over the entire length of the continuous sintering furnace 1.
  • the conveyance roller 21 has a cylindrical shape, and is disposed in the furnace through the entrance door 11 and the exit door 12 so that the axis of the conveyance roller 21 is horizontal and parallel to the front-rear direction.
  • a plurality of such conveying rollers 21 are arranged at the same height and at an interval narrower than the length in the conveying direction of the jig J on which the camshaft W is loaded.
  • each of the transport rollers 21 is supported so as to be rotatable about the axis of the roller. For example, all the rollers can be rotated in the same direction and at the same rotational speed by a chain (not shown) using a motor (not shown) as a power source.
  • the continuous sintering furnace 1 used in the present invention mounts the camshaft W on the conveying roller 21 and heats or cools the camshaft W while gradually moving the camshaft W forward by the rotation of the conveying roller 21. This is a method that applies
  • the heat treatment process and the cooling process in the present invention will be specifically described below.
  • the heat treatment process in the method for manufacturing a camshaft for an internal combustion engine according to the embodiment of the present invention will be described.
  • the camshaft W is carried into the continuous sintering furnace 1 through the carry-in entrance with the entrance door 11 of the continuous sintering furnace 1.
  • the carried camshaft W is carried into the preheating heating chamber 3 by the rotation of the conveying roller 21 serving as conveying means, and is heated to, for example, 500 to 700 ° C. to evaporate and remove the previously added wax.
  • the camshaft W that has been processed in the preheating device 3 is carried into the sintering device 4 and heated to a sintering temperature of 900 to 1120 ° C. to be sintered.
  • the camshaft W after the sintering process is finished is cooled in the cooling device 5 and carried out from the outlet door 12 of the continuous sintering furnace 1.
  • the preheating device 3 and the sintering device 4 provided in the continuous sintering furnace 1 used in the heat treatment process of the present invention are provided with heat sources (not shown) on the upper, lower, left and right surfaces of the camshaft W.
  • the continuous sintering furnace 1 used in the heat treatment process of the present invention employs a roller hearth type, whereby the heat of the heat source disposed on the bottom surface between adjacent rollers can be directly transmitted to the camshaft W.
  • the continuous sintering furnace 1 used in the heat treatment process of the present invention performs the same processing as a batch-type sintering furnace that employs a method in which, for example, a carriage carrying a plurality of camshafts is moved to sequentially perform heat treatment. Although it is possible, the sintering time can be shortened.
  • the cooling device 5 used in the cooling treatment process of the present invention is continuously arranged on the camshaft W carry-out side of the heat treatment device in the continuous sintering furnace 1.
  • the loading door 59 for loading W and the exit door 12 for unloading the camshaft W are opened and closed, and the cooling device 5 can be sealed by closing these doors.
  • the cooling device 5 according to the present invention can uniformly cool all of the plurality of camshafts W loaded on the jig J by performing cooling in a state where the inside is pressurized.
  • the cooling device 5 used in the present invention has a structure in which a graphite plate 51 is provided so as to surround all the camshafts W loaded on the jig J, and heat insulation by the graphite plate 51 during the cooling process, and Each camshaft can be cooled at a uniform speed without any individual difference without being affected by the mounting position of the camshaft W on the jig J by the heat radiation action.
  • the cooling device 5 used in the cooling processing step of the present invention is a system in which the cooling processing is performed in a state in which the graphite plate 51 is provided so as to surround all the camshafts W loaded on the jig J.
  • the graphite refers to a lump of carbon that can be formed by high-temperature heat treatment called graphitization.
  • the graphite material is porous, and the air existing inside absorbs heat and functions as a heat insulating material.
  • the graphite itself has a good thermal conductivity (high thermal conductivity), so it can be used for heat dissipation and cooling. It can also be suitably used for a floor board or the like.
  • the graphite plate 51 that surrounds the camshaft W in the cooling device 5 used in the cooling process of the present invention also acts as a heat storage body, can prevent partial overcooling of the camshaft W, and By suppressing the heat radiation from the camshaft W by increasing the temperature, the temperature difference due to the arrangement position of the camshaft W can be reduced.
  • cooling device 5 used in the cooling processing step of the present invention cooling can be performed at a uniform speed with respect to all the camshafts W in the cooling chamber 52, and mechanical portions are partially formed on the camshafts W.
  • the graphite plate is porous and air permeable, it is considered that these effects can be obtained.
  • a porous ceramic plate having excellent thermal conductivity can be used instead. I can do it.
  • a fan 53 is provided inside the cooling device 5 used in the cooling processing step of the present invention and is rotated by a motor stored in the fan driving device M, so that it is not shown.
  • the cooling gas introduced from the cooling gas inlet can be circulated in the cooling processing chamber 52.
  • a heat exchanger 55 that distributes the heat of the refrigerant introduced from the refrigerant introduction pipe 56 and exchanges the heat and leads the refrigerant through the refrigerant outlet pipe 57 is installed in the cooling processing chamber 52.
  • the cooling device 5 used in the cooling processing step of the present invention has such a structure, it is cooled each time the cooling gas or air circulating in the cooling processing chamber 52 comes into contact with the heat exchanger 55 and performs a rapid cooling process. I can do it.
  • a rectifying plate 58 is provided in the cooling processing chamber 52 for efficiently convectively circulating the introduced cooling gas.
  • the fan 53 can change the circulation speed when the cooling gas is circulated. For example, the fan 53 can be controlled between a state where the fan speed is 0 Hz, which is a state where the cooling gas is not circulated, and a state where the fan speed is 20 Hz to 60 Hz. In FIG.
  • the fan 53 is configured and arranged to send the cooling gas from the side, but is not limited to this position. Moreover, what pressurized nitrogen, argon, helium etc. can be used for the cooling gas used at the cooling treatment process of this invention, for example.
  • the cooling device 5 used in the cooling treatment process of the present invention can impart desired mechanical characteristics to the camshaft by adopting the above-described method.
  • the method for manufacturing a camshaft for an internal combustion engine according to the present invention employs a two-stage cooling method in the cooling process, and has a pearlite-based base structure excellent in wear characteristics such as pitting resistance and scuffing resistance. upon that, so that changing the cooling speed of the camshaft before and after the temperature in the vicinity of a 1 transformation point.
  • the heat treatment step is performed at a temperature controlled at a sintering temperature of 900 ° C. to 1120 ° C. ⁇ 10 ° C. during the sintering.
  • the sintering temperature applied to the sintered camshaft is usually in the temperature range between 900 ° C. and 1120 ° C., although it varies slightly depending on the composition of the sintered alloy powder used. Accordingly, the sintering apparatus 4 used in the heat treatment process of the present invention is in a vacuum state and energized each heat source provided in the apparatus, so that the temperature in the furnace is set to a predetermined temperature between 900 ° C. and 1120 ° C. By holding, the camshaft W is sintered. Incidentally, when the sintering temperature is 900 ° C.
  • the heat source used as a heat source on the four surfaces of the camshaft W in a heat processing process is employ
  • the first stage cooling treatment step is performed at a cooling rate of 20 ° C./sec between 700 ° C. and 900 ° C.
  • the method for manufacturing a camshaft for an internal combustion engine according to the present invention is based on cooling of the camshaft by cooling between 700 ° C and 900 ° C at a cooling rate of 20 ° C / sec in the first stage cooling process.
  • the occurrence of deformation can be suppressed. Therefore, according to the method for manufacturing a camshaft for an internal combustion engine according to the present invention, it is not necessary to perform machining or the like so that the camshaft W has a predetermined size after being cooled, and the manufacturing cost can be reduced. It will be. Note that the 700 ° C.
  • the cooling device 5 used in the cooling process of the present invention performs the cooling process with the graphite plate 51 provided so as to surround all the camshafts W loaded on the jig J as described above.
  • the camshaft can be uniformly cooled in a short time, unlike the case where the atmosphere in the cooling device is allowed to cool in a state where natural convection hardly acts. Therefore, according to the method for manufacturing a camshaft for an internal combustion engine according to the present invention, a camshaft excellent in wear characteristics such as pitting resistance and scuffing resistance can be obtained in a short time.
  • the second stage cooling process includes a cooling rate of 0.5 to 5 ° C./sec from the temperature after the completion of the first stage cooling process. It is preferable to cool at a rate of
  • the method for manufacturing a camshaft for an internal combustion engine according to the present invention has a cooling rate of 0.5 to 5 ° C./sec in a temperature range from 600 ° C. to the following temperature range where the risk of cooling distortion is low in the second stage cooling process.
  • the cooling device 5 used in the cooling processing step of the present invention includes the heat exchanger 57 in the cooling processing chamber 52 and increases the rotation speed of the fan 52 to improve the cooling efficiency. It is possible to further improve the cooling efficiency by maximizing the circulation speed of the cooling gas in the chamber 52.
  • the cooling device 5 used in the cooling processing step of the present invention employs a method of performing the cooling processing in a state where the graphite plate 51 is provided so as to surround all the camshafts W loaded on the jig J. By doing so, it becomes possible to cool all the camshafts at a uniform speed.
  • the internal combustion engine camshaft manufacturing method in the cooling processing step, the internal combustion engine camshaft is cooled in a state of being loaded in a plurality of mounting jigs stacked in multiple stages. Is preferred.
  • a plurality of camshafts W are horizontally placed so that the heat treatment and cooling of the sintered camshaft can be improved. It is preferable to process at a time in a state where a plurality of mounting plates are stacked. However, when a plurality of camshafts W are processed at the same time, a temperature difference is likely to occur depending on the position where they are placed. In particular, in order to obtain a desired mechanical property, the entire circumference of the camshaft W is as uniform as possible in the cooling process. Cooling is required.
  • the cooling device 5 used in the cooling process of the present invention since the graphite plate can be arranged on the bottom side even during the cooling process by adopting the roller hearth type, all the camshafts W It becomes possible to control the cooling rate of each of them without individual differences.
  • a large number of camshafts W having excellent wear characteristics such as pitting resistance and scuffing resistance can be manufactured in a single process.
  • the manufacturing cost can be reduced.
  • a camshaft having particularly high mechanical strength can be provided stably.
  • the camshaft produced by the manufacturing method of the present invention can reduce the diameter of the shaft or reduce the thickness of the hollow type shaft while maintaining excellent durability. , Can achieve its weight reduction.
  • the cooling process which takes a relatively long time compared to the heat treatment, can be shortened, so that each process can proceed efficiently.
  • the continuous sintering furnace 1 employs the method for manufacturing a camshaft for an internal combustion engine according to the present invention, so that the camshaft W is moved by the transport roller 21 so as to sequentially move the processing devices 2 to 5.
  • the camshaft W can be moved efficiently in the direction of the arrow shown in FIG.
  • the manufacturing cost can be reduced, so that high quality and high mechanical strength are required. It can be suitably employed for the sliding element.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention a pour objectif de fournir un procédé de fabrication d'arbre à came obtenu par stabilisation de résultat d'amélioration de caractéristiques d'usure telles que la résistance au tangage, à l'éraillure, ou similaire. Afin d'atteindre cet objectif, le procédé de fabrication d'arbre à came pour moteur à combustion interne de l'invention comporte : une étape de traitement thermique au cours de laquelle un arbre à came formé par assemblage d'une pièce de came en matériau fritté sur un corps principal d'arbre en tube métallique est chauffé jusqu'à une température de frittage par un dispositif de traitement thermique; et une étape de traitement de refroidissement au cours de laquelle l'arbre à came ayant subi un traitement thermique, est refroidi par un dispositif de traitement de refroidissement. Lors de l'étape de traitement de refroidissement, le refroidissement est effectué à travers deux niveaux d'étapes : une étape de traitement de refroidissement de premier niveau au cours de laquelle l'arbre à came est disposé dans un état dans lequel il est entouré de plaques de graphite sur la périphérie interne du dispositif de traitement de refroidissement, puis un refroidissement lent est effectué; et une étape de traitement de refroidissement de second niveau au cours de laquelle un gaz de refroidissement est injecté à l'intérieur du dispositif de traitement de refroidissement, et mis en circulation par un ventilateur afin d'effectuer un refroidissement rapide.
PCT/JP2011/072597 2011-09-30 2011-09-30 Procédé de fabrication d'arbre à came pour moteur à combustion interne WO2013046445A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2011/072597 WO2013046445A1 (fr) 2011-09-30 2011-09-30 Procédé de fabrication d'arbre à came pour moteur à combustion interne
KR1020147007129A KR101539314B1 (ko) 2011-09-30 2012-09-28 내연기관용 캠샤프트의 제조 방법
PCT/JP2012/075109 WO2013047761A1 (fr) 2011-09-30 2012-09-28 Procédé de fabrication d'arbre à came pour moteur à combustion interne
JP2013536432A JP5988985B2 (ja) 2011-09-30 2012-09-28 内燃機関用カムシャフトの製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/072597 WO2013046445A1 (fr) 2011-09-30 2011-09-30 Procédé de fabrication d'arbre à came pour moteur à combustion interne

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WO2013046445A1 true WO2013046445A1 (fr) 2013-04-04

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PCT/JP2012/075109 WO2013047761A1 (fr) 2011-09-30 2012-09-28 Procédé de fabrication d'arbre à came pour moteur à combustion interne

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112695269A (zh) * 2020-11-30 2021-04-23 山西平阳重工机械有限责任公司 一种18Cr2Ni4WA工件的热处理工艺

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101455744B1 (ko) * 2014-07-08 2014-11-04 주식회사 한빛나노의료기 의료기기용 바이오 세라믹스의 제조방법과, 이 방법에 사용되는 의료기기용 바이오 세라믹스 소결장치
JP7029563B1 (ja) 2021-03-30 2022-03-03 株式会社ノリタケカンパニーリミテド 連続加熱炉および段数変更装置

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JPH0436438A (ja) * 1990-05-31 1992-02-06 Honda Motor Co Ltd 内燃機関用動弁機構のカムシャフト、及びその製造方法
JPH06193708A (ja) * 1992-12-25 1994-07-15 Nippon Piston Ring Co Ltd カムシャフトの製造方法
JPH11350029A (ja) * 1998-06-09 1999-12-21 Honda Motor Co Ltd 金型鋳造品の熱処理方法

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JPS62124256A (ja) * 1985-11-21 1987-06-05 Kawasaki Steel Corp 黒鉛が析出した摺動部材用焼結鋼
JPH0599572A (ja) * 1991-10-12 1993-04-20 Daido Steel Co Ltd 連続式真空炉
JP3696476B2 (ja) * 2000-03-27 2005-09-21 日本ピストンリング株式会社 組立式カムシャフトのシャフトおよび組立式カムシャフトの製造方法
JP2002277167A (ja) * 2001-03-22 2002-09-25 Daido Steel Co Ltd ローラハース式熱処理炉

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH0436438A (ja) * 1990-05-31 1992-02-06 Honda Motor Co Ltd 内燃機関用動弁機構のカムシャフト、及びその製造方法
JPH06193708A (ja) * 1992-12-25 1994-07-15 Nippon Piston Ring Co Ltd カムシャフトの製造方法
JPH11350029A (ja) * 1998-06-09 1999-12-21 Honda Motor Co Ltd 金型鋳造品の熱処理方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112695269A (zh) * 2020-11-30 2021-04-23 山西平阳重工机械有限责任公司 一种18Cr2Ni4WA工件的热处理工艺

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KR20140049074A (ko) 2014-04-24
JP5988985B2 (ja) 2016-09-07
WO2013047761A1 (fr) 2013-04-04
JPWO2013047761A1 (ja) 2015-03-30
KR101539314B1 (ko) 2015-07-24

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