JP2005248793A - Method for manufacturing exterior part for built-up camshaft - Google Patents

Method for manufacturing exterior part for built-up camshaft Download PDF

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Publication number
JP2005248793A
JP2005248793A JP2004059157A JP2004059157A JP2005248793A JP 2005248793 A JP2005248793 A JP 2005248793A JP 2004059157 A JP2004059157 A JP 2004059157A JP 2004059157 A JP2004059157 A JP 2004059157A JP 2005248793 A JP2005248793 A JP 2005248793A
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Prior art keywords
cam
camshaft
cam piece
manufacturing
piece
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JP2004059157A
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Japanese (ja)
Inventor
Kazuaki Okuno
和昭 奥野
Hirohisa Harada
浩久 原田
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2004059157A priority Critical patent/JP2005248793A/en
Priority to US10/591,323 priority patent/US20070175028A1/en
Priority to PCT/JP2005/002299 priority patent/WO2005085604A1/en
Publication of JP2005248793A publication Critical patent/JP2005248793A/en
Withdrawn legal-status Critical Current

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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
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • 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
    • F01L1/047—Camshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/02—Camshafts
    • 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
    • F01L1/047—Camshafts
    • F01L2001/0475—Hollow camshafts
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49293—Camshaft making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49984—Coating and casting

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gears, Cams (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing exterior parts for a built-up camshaft which improves productivity and hardness of cam lobes. <P>SOLUTION: A cam-piece continuous body 6 is chilled (transformed to white iron) by undergoing rapid cooling by a chiller 4 right after pouring the molten metal. As a result, the cam-piece continuous body 6 has a very high hardness on one hand, but decreased tensile strength and shearing strength on the other. In the cast cam-piece continuous body 6, cam-piece original shapes and notches are formed in an alternating sequence. The cam-piece continuous body 6 is held in a holder, and in that state, one stoke is given to the notch by a breaking tool, then the cam-piece continuous body 6 of the decreased tensile strength is broken at the notch of the easily breakable part. Thus, individual cam pieces are obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、レシプロエンジンに用いられる組立式カムシャフト用の外装部品を製造する方法に関する。   The present invention relates to a method of manufacturing an exterior part for an assembly camshaft used in a reciprocating engine.

レシプロエンジンの動弁機構としては、カムと吸排気バルブとの間にロッカアームやスイングアーム等を介在させたものの他、エンジンの高回転化や高出力化に対応すべく吸排気バルブ（タペット）の直上部にカムを配置した直接駆動式のものも採用されている。カムが形成されるカムシャフトとしては、鋳造成形や鍛造成形、切削成形による一体品が一般に採用されているが、カムローブ部とシャフト部とで機械的性質（剛性や硬度、潤滑性等）を自由に設定できる他、生産性の向上や低コスト化等を比較的容易に実現できることから、組立式カムシャフトの採用が進められている。組立式カムシャフトは、例えば、鋼管等を素材とする中空シャフトと、カムピースやノーズピース等の外装部品とからなっており、中空シャフトとこれら外装部品とが溶接結合や圧入結合、拡管結合等により固着される。   The reciprocating engine's valve operating mechanism includes a rocker arm, swing arm, etc. between the cam and intake / exhaust valves, as well as intake / exhaust valves (tapets) to cope with higher engine speeds and higher output. A direct drive type in which a cam is arranged directly above is also employed. As the camshaft on which the cam is formed, an integrated product by casting, forging, or cutting is generally used, but the mechanical properties (rigidity, hardness, lubricity, etc.) are free between the cam lobe and the shaft. In addition, since it is relatively easy to improve productivity and reduce costs, an assembly type camshaft is being adopted. The assembly type camshaft is composed of, for example, a hollow shaft made of a steel pipe or the like and exterior parts such as a cam piece and a nose piece. The hollow shaft and these exterior parts are welded, press-fitted, expanded, etc. It is fixed.

組立式カムシャフト用の外装部品は、種々の製造方法により製造されている。例えば、機械加工を主体としてカムピースを製造する方法としては、中空の棒材外周面に切削加工および研削加工を施して所定のカムプロフィールを有するカムピース素材を作成した後、所定の幅に切断してカムピース（輪切りカム）を得るもの（特許文献１参照）や、中実の棒材の外周面に切削加工および研削加工を施して所定のカムプロフィールを有するカムピース素材を作成し、カムピース素材に表面硬化処理を施した後、所定の幅に切断するとともにシャフト孔を穴あけ加工してカムピースを得るもの（特許文献２参照）が提案されている。また、塑性加工を主体とする製造方法としては、素材をカムピースの厚み方向に据え込んで輪郭形状を鍛造成形して中間成形体を得た後、中間成形体の中央部にシャフト穴を打ち抜き、このシャフト穴の内周面を仕上げ成形するもの（特許文献３参照）が提案されている。また、鋳造を主体とする製造方法としては、粒子分散アルミニウム合金を素材にダイキャスト成形によりシャフト孔（嵌合孔）を有するカムピースを形成し、シャフト孔を機械加工するもの（特許文献４参照）が提案されている。
等が公知となっている。
実開昭５２−４１４０４号公報（段落００１５〜００２２、図１，図６） 特開平３−１５６０９号公報（実施例、第１図） 特開２００３−２８５１３８号公報（段落００４２〜００４６，図１） 特開平９−２５６８１９号公報（段落０００８，０００９、図１） The exterior parts for the assembly type camshaft are manufactured by various manufacturing methods. For example, as a method of manufacturing a cam piece mainly using machining, a cutting and grinding process is performed on the outer peripheral surface of a hollow bar to create a cam piece material having a predetermined cam profile, and then cut into a predetermined width. A cam piece material having a predetermined cam profile is created by cutting and grinding the outer peripheral surface of a solid bar material (see Patent Document 1) or a cam piece material (see Patent Document 1). After processing, what cut | disconnects to a predetermined width and drills a shaft hole, and obtains a cam piece is proposed (refer patent document 2). In addition, as a manufacturing method mainly for plastic working, after placing the material in the thickness direction of the cam piece and forging the contour shape to obtain an intermediate molded body, a shaft hole is punched in the center of the intermediate molded body, The one that finish-molds the inner peripheral surface of the shaft hole (see Patent Document 3) has been proposed. Further, as a manufacturing method mainly including casting, a cam piece having a shaft hole (fitting hole) is formed by die casting using a particle-dispersed aluminum alloy as a raw material, and the shaft hole is machined (see Patent Document 4). Has been proposed.
Etc. are publicly known.
Japanese Utility Model Publication No. 52-41404 (paragraphs 0015 to 0022, FIGS. 1 and 6) Japanese Patent Laid-Open No. 3-15609 (Example, FIG. 1) JP 2003-285138 A (paragraphs 0042-0046, FIG. 1) Japanese Patent Laid-Open No. 9-256819 (paragraphs 0008, 0009, FIG. 1)

特許文献１や特許文献２に記載された製造方法は、中空あるいは中実の棒材から機械加工によってカムピースを形成するものであるため、カムプロフィールを形成するための装置（ＮＣ倣い盤等）やカムピース素材からカムピースを切り出す切断装置が必要となる他、製造に要する時間や工数が多大となる等の問題があった。また、特許文献３や特許文献４に記載された製造方法は、鍛造成形や鋳造成形によりカムピースを得るものであるが、金型におけるキャビティレイアウト等に制限があるため、一度の鍛造プロセスや鋳造プロセスで得られるカムピースの個数をあまり多くできず、生産性を高めることが難しい等の問題があった。
本発明は、このような技術的背景に鑑みてなされたもので、生産性の向上等を図った組立式カムシャフト用外装部品の製造方法を提供することを課題とする。 Since the manufacturing methods described in Patent Document 1 and Patent Document 2 form a cam piece by machining from a hollow or solid bar, an apparatus for forming a cam profile (such as an NC copying machine) In addition to the need for a cutting device that cuts out the cam piece from the cam piece material, there are problems such as an increase in the time and man-hours required for manufacturing. Moreover, although the manufacturing method described in patent document 3 and patent document 4 obtains a cam piece by forge molding or cast molding, since there is a limitation in the cavity layout etc. in the mold, the forging process or casting process is performed once. In other words, the number of cam pieces obtained in the above method cannot be increased so much that it is difficult to increase productivity.
The present invention has been made in view of such a technical background, and an object of the present invention is to provide a method for manufacturing an exterior component for an assembling-type camshaft that improves productivity and the like.

請求項１の組立式カムシャフト用外装部品の製造方法は、組立式カムシャフト用の外装部品を製造する方法であって、シャフト嵌入孔を有する複数の外装部品素形が脆弱部を挟んで連成された外装部品連成体を鋳造成形する鋳造工程と、当該外装部品連成体を前記脆弱部で破断させて外装部品を得る分割工程とを含むことを特徴とする。
請求項１の製造方法では、例えば、金型内にカムピース素形およびノッチを形成する入れ子とシャフト孔を形成する砂中子とをセットした後、湯口から鋳鋼等の溶湯を金型に注ぐ。そして、外装部品連成体が得られたら、これを治具にセットしてノッチに鋭利な刃先を有する工具で打撃を与え、破断させることにより外装部品を得る。 A method for manufacturing an exterior component for an assembly type camshaft according to claim 1 is a method for manufacturing an exterior component for an assembly type camshaft, wherein a plurality of exterior component shapes having shaft insertion holes are arranged with a weak portion interposed therebetween. It includes a casting step of casting the formed exterior component coupling body and a dividing step of breaking the exterior component coupling body at the fragile portion to obtain an exterior component.
In the manufacturing method according to the first aspect, for example, a nest that forms a cam piece and a notch and a sand core that forms a shaft hole are set in a mold, and then a molten metal such as cast steel is poured into the mold from a gate. And if an exterior component coupling body is obtained, this will be set to a jig | tool, it will be struck with the tool which has a sharp blade edge | tip in a notch, and an exterior component will be obtained by making it break.

また、請求項２は、請求項１の組立式カムシャフト用外装部品の製造方法において、前記鋳造工程時に前記外装部品連成体をチル化することを特徴とする。
請求項１の製造方法では、例えば、入れ子を銅合金等で製作したチラーとすることにより、溶湯を急冷して外装部品連成体をチル化させる。 According to a second aspect of the present invention, in the method for manufacturing an exterior component for a camshaft of the first aspect, the exterior component coupling body is chilled during the casting step.
In the manufacturing method of claim 1, for example, by using a chiller made of a copper alloy or the like as a nest, the molten metal is rapidly cooled to chill the exterior component coupled body.

請求項１の組立式カムシャフト用外装部品の製造方法によれば、一度の鋳造プロセスで多数の外装部品素形と脆弱部とを有する外装部品連成体が得られ、更にこの外装部品連成体の脆弱部にエアハンマや手作業による打撃を与えて破断させることで多数個の外装部品を短時間で製造することができる。また、請求項２の組立式カムシャフト用外装部品の製造方法によれば、外装部品の硬度を高められると同時に、外装部品連成体の脆弱部での破断が容易となる。   According to the method of manufacturing an exterior component for an assembling type camshaft according to claim 1, an exterior component coupling body having a large number of exterior component shapes and fragile portions is obtained by a single casting process. A large number of exterior parts can be manufactured in a short time by smashing the fragile portion by hitting it with an air hammer or manually. Further, according to the method for manufacturing an exterior component for an assembling type camshaft according to the second aspect, the hardness of the exterior component can be increased, and at the same time, breakage at the fragile portion of the exterior component coupled body is facilitated.

以下、本発明を組立式カムシャフト用カムピースの製造に適用した一実施形態を、図面を参照して詳細に説明する。図１は実施形態に係る組立式カムシャフト（以下、単にカムシャフトと記す）を示す斜視図であり、図２は同カムシャフトの要部縦断面図であり、図３は鋳造金型を示す縦断面図であり、図４は鋳造金型の要部を示す縦断面図であり、図５はチラーを示す斜視図であり、図６はカムピース連成体の鋳造工程を示す説明図であり、図７はカムピース連成体からチラーに熱が奪われる状態を示す説明図であり、図８はカムピース連成体を示す斜視図であり、図９はカムピース連成体の破断工程を示す説明図であり、図１０はカムピースの斜視図であり、図１１はカムシャフトの組立工程を示す説明図である。   Hereinafter, an embodiment in which the present invention is applied to manufacture of a cam piece for an assembly type camshaft will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an assembly-type camshaft (hereinafter simply referred to as a camshaft) according to an embodiment, FIG. 2 is a longitudinal sectional view of a main part of the camshaft, and FIG. 3 shows a casting mold. FIG. 4 is a longitudinal sectional view showing a main part of a casting mold, FIG. 5 is a perspective view showing a chiller, and FIG. 6 is an explanatory view showing a casting process of a cam piece coupled body. FIG. 7 is an explanatory view showing a state where heat is taken away from the cam piece combined body by the chiller, FIG. 8 is a perspective view showing the cam piece combined body, and FIG. 9 is an explanatory view showing a breaking process of the cam piece combined body, FIG. 10 is a perspective view of the cam piece, and FIG. 11 is an explanatory view showing the assembly process of the camshaft.

図１および図２に示すカムシャフト１００は、４サイクルＤＯＨＣ４気筒エンジンの吸気バルブを駆動するもので、中空シャフト１０１にカムピース９やエンドピース１０２を固着させることにより製造されている。中空シャフト１０１は、冷間引抜鋼管（例えば、機械構造用炭素鋼鋼管ＳＴＫＭ１７Ｃ等）を素材とする機械加工品であり、両端のセンタを基準としてその外周面が研削仕上げされている。また、カムピース９やエンドピース１０２は、鋳鋼（例えば、低合金鋼鋳鋼ＳＣＮＣｒＭ２）を素材とする鋳造品であり、中空シャフト１０１に対して圧入（あるいは、ろう付け）により外嵌・固着されている。   A camshaft 100 shown in FIGS. 1 and 2 drives an intake valve of a 4-cycle DOHC four-cylinder engine, and is manufactured by fixing a cam piece 9 and an end piece 102 to a hollow shaft 101. The hollow shaft 101 is a machined product made of a cold drawn steel pipe (for example, a carbon steel pipe STKM17C for machine structure), and its outer peripheral surface is ground and finished with reference to the centers at both ends. The cam piece 9 and the end piece 102 are cast products made of cast steel (for example, low alloy steel cast steel SCNCrM2), and are externally fitted and fixed to the hollow shaft 101 by press-fitting (or brazing). .

次に、図３〜図１１を参照して、本実施形態におけるカムピース９の製造設備とカムピース９およびカムシャフト１００の製造手順とを述べる。
図３において、鋳造設備１は、二分割型の鋳造金型２と、この鋳造金型２に対して砂中子３１を挿入する中子駆動装置３とを主要構成要素としている。鋳造金型２は、溶湯を注入するための受口２１と、受口２１から下方に延設された湯口２２と、湯口２２からの溶湯を水平に導く湯道２３と、湯道２３の先端から上方に延設されたキャビティ２４と、キャビティ２４の上端に形成された開口２５とを備えている。 Next, with reference to FIGS. 3 to 11, a manufacturing facility for the cam piece 9 and a manufacturing procedure for the cam piece 9 and the camshaft 100 in the present embodiment will be described.
In FIG. 3, the casting facility 1 includes a two-part casting mold 2 and a core driving device 3 for inserting a sand core 31 in the casting mold 2 as main components. The casting mold 2 includes a receiving port 21 for pouring molten metal, a pouring gate 22 extending downward from the receiving port 21, a runway 23 for horizontally guiding the molten metal from the pouring gate 22, and the tip of the running channel 23. And a cavity 24 extending upward from the top and an opening 25 formed at the upper end of the cavity 24.

図４に示すように、鋳造金型２にはチラー保持部２６が形成されており、キャビティ２４を形成する多数個のチラー（冷し金）４がこのチラー保持部２６に積層された状態で収納されている。チラー４は、熱伝導性に優れた銅合金を素材としており、図５に示すように、その内面にカムピース素形形成部４１とノッチ形成部４２とを有している。ノッチ形成部４２は、チラー４の一端（図５中で左方）から、キャビティ２４内に突出するかたちで全周に形成されている。   As shown in FIG. 4, a chiller holding portion 26 is formed in the casting mold 2, and a plurality of chillers (cooling gold) 4 forming the cavity 24 are stacked on the chiller holding portion 26. It is stored. The chiller 4 is made of a copper alloy having excellent thermal conductivity, and has a cam piece shape forming portion 41 and a notch forming portion 42 on its inner surface as shown in FIG. The notch forming portion 42 is formed on the entire circumference in a form protruding from the one end (left side in FIG. 5) of the chiller 4 into the cavity 24.

カムピース９の製造にあたり、製造作業者は先ず、図６（ａ）に示すように、中子駆動装置３を用いて、型締めされた鋳造金型２のキャビティ２４内に砂中子３１を挿入する。しかる後、図６（ｂ）に示すように、製造作業者は、とりべ５を用いて受口２１から鋳造金型２内に溶湯５１を注ぐ。すると、溶湯５１は、湯口２２および湯道２３を経由して、キャビティ２４および開口２５に流入する。   In manufacturing the cam piece 9, the manufacturing operator first inserts the sand core 31 into the cavity 24 of the cast mold 2 that has been clamped, as shown in FIG. 6A. To do. Thereafter, as shown in FIG. 6B, the manufacturing operator pours the molten metal 51 into the casting mold 2 from the receiving port 21 using the ladle 5. Then, the molten metal 51 flows into the cavity 24 and the opening 25 via the gate 22 and the runner 23.

溶湯５１は、鋳造金型２に注入されると、図６（ｃ）に示すように、カムピース連成体６を含む鋳込品７となる。この際、本実施形態では、キャビティ２４がチラー４に形成されているため、図７に示すように、カムピース連成体６は、溶湯５１の注入直後からチラー４によって急速に熱が奪われ、チル化（白銑化）する。その結果、カムピース連成体６は、その硬度が非常に高くなる一方、引張強度や剪断強度は低下する。   When the molten metal 51 is injected into the casting mold 2, as shown in FIG. 6C, the molten metal 51 becomes a cast product 7 including the cam piece coupled body 6. At this time, since the cavity 24 is formed in the chiller 4 in this embodiment, the cam piece coupled body 6 is rapidly deprived of heat by the chiller 4 immediately after the molten metal 51 is injected, as shown in FIG. To turn into white. As a result, the cam piece coupled body 6 has a very high hardness, while its tensile strength and shear strength are reduced.

製造作業者は、所定時間が経過して鋳込品７が完全に凝固すると、図６（ｃ）に示すように、中子駆動装置３に砂中子３１の解放と退避動（上昇動）とを行わせる。次に、製造作業者は、鋳造金型２を開いて鋳込品７を取り出し、不要部分（鋳造金型２の湯道２３や開口２５等にあたる部分）や砂中子３１を除去してカムピース連成体６を得る。図８に示すように、カムピース連成体６には、カムピース素形形成部４１（図４参照）によるカムピース素形（外装部品素形）６１と、ノッチ形成部４２（図４参照）によるノッチ（脆弱部）６２とが交互に形成されている。   When the casting product 7 is completely solidified after a lapse of a predetermined time, the manufacturing operator releases and retracts (lifts) the sand core 31 in the core driving device 3 as shown in FIG. 6 (c). And do. Next, the manufacturer opens the casting mold 2 and takes out the cast product 7, and removes unnecessary portions (portions corresponding to the runner 23, opening 25, etc. of the casting mold 2) and the sand core 31 to remove the cam piece. A coupled body 6 is obtained. As shown in FIG. 8, the cam piece coupled body 6 includes a cam piece shape (exterior part shape) 61 formed by the cam piece shape forming portion 41 (see FIG. 4) and a notch formed by the notch forming portion 42 (see FIG. 4). Fragile portions) 62 are alternately formed.

次に、製造作業者は、図９に示すように、カムピース連成体６を保持装置８１に保持させた状態で、破断工具８２によりノッチ６２に打撃を与える。すると、引張強度が低いカムピース連成体６は脆弱部であるノッチ６２で破断し、個々のカムピース９が得られる。カムピース９は、図１０に示すように、カムピース素形形成部４１（図７参照）により形成されたカム面９１と、砂中子３１（図７参照）により形成されたシャフト孔９２と、破断面である側面９３とを有している。   Next, as shown in FIG. 9, the manufacturing worker strikes the notch 62 with the breaking tool 82 in a state where the cam piece coupled body 6 is held by the holding device 81. Then, the cam piece coupled body 6 having a low tensile strength is broken at the notch 62 which is a fragile portion, and individual cam pieces 9 are obtained. As shown in FIG. 10, the cam piece 9 includes a cam surface 91 formed by the cam piece shape forming portion 41 (see FIG. 7), a shaft hole 92 formed by the sand core 31 (see FIG. 7), and a breakage. And a side surface 93 which is a cross section.

次に、製造作業者は、必要に応じてカム面９１に対する粗加工やシャフト孔９２に対する切削加工を行った後、図１１に示すように、中空シャフト１０１に外嵌させて圧入する。次に、製造作業者は、中空シャフト１０１に対してノーズピース等、他の外装部品を取り付けた後、カム面９１にカムプロフィールを形成するための研削仕上げを行い、図１に示すカムシャフト１００を得る。尚、図１に示すように、カムシャフト１００では、カムピース９の側面９３が破断面のままであるが、相手側部品（ロッカアームやタペット）とはカム面９１のみが摺接することと、エンジンに組み付けられた状態ではカムシャフト１００が露出しないことにより不具合はない。   Next, the manufacturing operator performs rough machining on the cam surface 91 and cutting on the shaft hole 92 as necessary, and then press fits the hollow shaft 101 as shown in FIG. Next, after attaching other exterior parts such as a nose piece to the hollow shaft 101, the manufacturing worker performs a grinding finish to form a cam profile on the cam surface 91, and the camshaft 100 shown in FIG. Get. As shown in FIG. 1, in the camshaft 100, the side surface 93 of the cam piece 9 remains a broken surface, but only the cam surface 91 is in sliding contact with the counterpart component (rocker arm or tappet), In the assembled state, there is no problem because the camshaft 100 is not exposed.

本実施形態では、以上述べた手順でカムピース９およびカムシャフト１００を製造するようにしたため、カムピースの硬度を高めながら、従来装置に較べて生産性の大幅な向上を実現できた。   In this embodiment, since the cam piece 9 and the cam shaft 100 are manufactured according to the above-described procedure, the productivity can be significantly improved as compared with the conventional apparatus while increasing the hardness of the cam piece.

以上で具体的実施形態の説明を終えるが、本発明の態様はこの実施形態に限られるものではない。例えば、前記実施形態は、本発明をカムピースの製造方法に適用したものであるが、ジャーナルやエンドピース等、他の外装部品にも当然に適用可能である。また、カムピースや中空シャフトの素材を始め、鋳造金型の具体的構造やチラーの材質等についても、前記実施形態で挙げたものに限られるものではなく、設計上あるいはコスト上の判断等に基づいて適宜選択あるいは変更可能である。   Although description of specific embodiment is finished above, the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the present invention is applied to a method of manufacturing a cam piece, but can naturally be applied to other exterior parts such as a journal and an end piece. In addition, the specific structure of the casting mold and the material of the chiller including the material of the cam piece and the hollow shaft are not limited to those described in the above embodiment, and are based on design or cost judgments. Can be appropriately selected or changed.

実施形態に係る組立式カムシャフトを示す斜視図である。It is a perspective view which shows the assembly-type camshaft which concerns on embodiment. 実施形態に係る組立式カムシャフトの要部斜視図である。It is a principal part perspective view of the assembly-type camshaft which concerns on embodiment. 鋳造金型を示す縦断面図である。It is a longitudinal cross-sectional view which shows a casting mold. 鋳造金型の要部を示す縦断面図である。It is a longitudinal cross-sectional view which shows the principal part of a casting mold. チラーを示す斜視図である。It is a perspective view which shows a chiller. カムピース連成体の鋳造工程を示す説明図である。It is explanatory drawing which shows the casting process of a cam piece coupling body. カムピース連成体からチラーに熱が奪われる状態を示す説明図である。It is explanatory drawing which shows the state from which heat is taken by a chiller from a cam piece coupling body. カムピース連成体を示す斜視図である。It is a perspective view which shows a cam piece coupling body. カムピース連成体の破断工程を示す説明図である。It is explanatory drawing which shows the fracture | rupture process of a cam piece coupling body. カムピースの斜視図である。It is a perspective view of a cam piece. カムシャフトの組立工程を示す説明図である。It is explanatory drawing which shows the assembly process of a cam shaft.

符号の説明Explanation of symbols

１ カムシャフト
２ 鋳造金型
４ チラー
６ カムピース連成体（外装部品連成体）
９ カムピース（外装部品）
２４ キャビティ
３１ 砂中子
４１ カムピース素形形成部
４２ ノッチ形成部
６１ カムピース素形（外装部品素形）
６２ ノッチ（脆弱部）
８２ 破断工具
９１ カム面
９２ シャフト孔
９３ 側面
１００ カムシャフト
１０１ 中空シャフト 1 Camshaft 2 Casting mold 4 Chiller 6 Cam piece coupled body (exterior component coupled body)
9 Cam pieces (exterior parts)
24 Cavity 31 Sand core 41 Cam piece shape forming portion 42 Notch forming portion 61 Cam piece shape (exterior part shape)
62 Notch (fragile part)
82 Breaking tool 91 Cam surface 92 Shaft hole 93 Side surface 100 Cam shaft 101 Hollow shaft

Claims (2)

組立式カムシャフト用の外装部品を製造する方法であって、
シャフト嵌入孔を有する複数の外装部品素形が脆弱部を挟んで連成された外装部品連成体を鋳造成形する鋳造工程と、
当該外装部品連成体を前記脆弱部で破断させて外装部品を得る分割工程と
を含むことを特徴とする組立式カムシャフト用外装部品の製造方法。 A method of manufacturing an exterior part for a prefabricated camshaft,
A casting step of casting a plurality of exterior part shapes having a shaft insertion hole and formed by interposing a weak part with a weak part;
A method of manufacturing an exterior component for an assembling-type camshaft, comprising: a splitting step in which the exterior component coupling body is broken at the fragile portion to obtain the exterior component. 前記鋳造工程時に前記外装部品連成体をチル化することを特徴とする、請求項１に記載の組立式カムシャフト用外装部品の製造方法。   The method for manufacturing an exterior component for an assembly type camshaft according to claim 1, wherein the exterior component coupling body is chilled during the casting process.
JP2004059157A 2004-03-03 2004-03-03 Method for manufacturing exterior part for built-up camshaft Withdrawn JP2005248793A (en)

Priority Applications (3)

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JP2004059157A JP2005248793A (en) 2004-03-03 2004-03-03 Method for manufacturing exterior part for built-up camshaft
US10/591,323 US20070175028A1 (en) 2004-03-03 2005-02-16 Method for producing exterior component of assembled camshaft
PCT/JP2005/002299 WO2005085604A1 (en) 2004-03-03 2005-02-16 Method of manufacturing exterior part for assembly type camshaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010209796A (en) * 2009-03-10 2010-09-24 Toyota Motor Corp Camshaft supporting structure
JP2012237200A (en) * 2011-05-10 2012-12-06 Mitsubishi Motors Corp Assembling camshaft
CN108015481A (en) * 2016-11-02 2018-05-11 大众汽车有限公司 Method for being post-processed to combination type functional axis

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023249954A2 (en) * 2022-06-20 2023-12-28 Cummins Inc. Systems and methods for improving iron-based camshaft fatigue life

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4891305U (en) * 1972-02-09 1973-11-02
JP2571820B2 (en) * 1988-06-06 1997-01-16 日産自動車株式会社 Method for manufacturing remelted chill camshaft
GB9009004D0 (en) * 1990-04-21 1990-06-20 Lydmet Ltd Camshafts
US5201117A (en) * 1991-11-04 1993-04-13 General Motors Corporation Method and apparatus for sizing and cutting tubing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010209796A (en) * 2009-03-10 2010-09-24 Toyota Motor Corp Camshaft supporting structure
JP2012237200A (en) * 2011-05-10 2012-12-06 Mitsubishi Motors Corp Assembling camshaft
CN108015481A (en) * 2016-11-02 2018-05-11 大众汽车有限公司 Method for being post-processed to combination type functional axis
CN108015481B (en) * 2016-11-02 2019-11-15 大众汽车有限公司 Method for being post-processed to combination type functional axis

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