JPH05222458A - Method and device for executing high frequency induction hardening of cast steel cam shaft - Google Patents
Method and device for executing high frequency induction hardening of cast steel cam shaftInfo
- Publication number
- JPH05222458A JPH05222458A JP4028100A JP2810092A JPH05222458A JP H05222458 A JPH05222458 A JP H05222458A JP 4028100 A JP4028100 A JP 4028100A JP 2810092 A JP2810092 A JP 2810092A JP H05222458 A JPH05222458 A JP H05222458A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- cooling
- camshaft
- seconds
- cast steel
- Prior art date
- Legal status (The legal status 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 status listed.)
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Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋳鋼カムシャフトの焼
入れに伴う変形等を抑える高周波焼入れ方法及びその装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction hardening method and apparatus for suppressing deformation of a cast steel camshaft due to hardening.
【０００２】[0002]
【従来の技術】過酷な摺動条件下で使用される内燃機関
用カムシャフトは、従来より摺動面部に多量の炭化物を
形成させたチル鋳鉄材が多く用いられている。近年、内
燃機関の高性能化や高出力化に伴い、カムシャフトも例
外ではなくエンジン高回転、高接触面圧下での厳しい摺
動条件に耐えられる耐摩耗性、耐スカッフィング性が要
求されている。耐摩耗性及び耐スカッフィング性を向上
させるためにその摺動面部の炭化物量もますます増加の
傾向にあり、こうした意味から鋳鋼材や焼結合金材が多
く用いられつつある。鋳鋼材を使用する場合、基地の組
織の耐摩耗性を向上させるために焼入処理する必要があ
り、様々な利点を考慮して高周波焼入れが採り入れられ
ている。高周波焼入れの利点としては、１）短時間で表
面焼入れが可能。２）焼入れ深さを調節できる。３）局
部的な加熱が可能。４）均一で良質な焼入れが可能。
５）焼入れ経費を著しく節減できるなどが挙げられる。
図９は「周波数と浸透深さの関係」、図１０は「周波数
と有効硬化層深さの関係」を示す公知例である。高周波
焼入れ装置においては、その使用周波数と有効硬化層深
さとの関係に、周波数が大きくなるほど逆に有効深さが
小さくなるということがある。従って、カム部ノーズの
硬化層深さ、カム駒の表面硬さに対する要求を満足させ
るためには、使用周波数、そして加熱−冷却の条件が必
要である。要求に応えるカム部ノーズの硬化層を得、し
かも短時間に加熱−冷却が可能な周波数としては、例え
ば５〜３０ＫＨｚのＭＦ帯域を用いることが理想的であ
る。先の両図に示された特性から、カムシャフトのカム
駒の形状とそれに対応する有効硬化層深さ及び表面硬さ
を考慮した場合、カム部ノーズのトップに近いほど有効
硬化層が深くかつ硬度が高くなければならない。それに
対して、ベース円は有効硬化層及び硬度が共にある程度
のレベルを満足すればよい。また、高周波焼入れ後のカ
ムシャフトの変形量を極小に抑えることができれば後工
程の加工にとって好都合である。そして、カム駒の形状
とそれに対応する有効硬化層深さ及び表面硬さを考慮し
た場合、カム部ノーズのトップに近いほど有効硬化層が
深く、そして硬くなければならない。それに対し、ベー
ス円はある程度のレベルさえ満足すればよい。従って、
要求に応じた硬化層深さ及び硬さを満足でき、最も効率
のよい周波数として、従来のものは３０ＫＨｚを使用し
ている。図１１及び図１２は、独立して設備された加熱
装置１及び冷却装置２を示し、焼入れワークのカムシャ
フトＣが立てた状態でその上下端を保持される。加熱装
置１は加熱コイル３を有し、冷却装置２は冷却ノズル４
が備わっている。また、装置１、２には変形矯正用バッ
クアップ・ローラとして複数の受けローラ５、押えロー
ラ６が設備されている。2. Description of the Related Art For camshafts for internal combustion engines used under severe sliding conditions, chill cast iron materials having a large amount of carbide formed on their sliding surfaces have been widely used. With the high performance and high output of internal combustion engines in recent years, camshafts are no exception, and wear resistance and scuffing resistance that can withstand severe sliding conditions under high engine speed and high contact surface pressure are required. .. In order to improve wear resistance and scuffing resistance, the amount of carbide on the sliding surface is also increasing, and in this sense, cast steel materials and sintered alloy materials are being widely used. When a cast steel material is used, it is necessary to quench it in order to improve the wear resistance of the matrix structure, and induction hardening is adopted in consideration of various advantages. The advantages of induction hardening are: 1) Surface hardening is possible in a short time. 2) The quenching depth can be adjusted. 3) Local heating is possible. 4) Uniform and good quality quenching is possible.
5) Quenching costs can be significantly reduced.
FIG. 9 is a known example showing "relationship between frequency and penetration depth" and FIG. 10 shows "relationship between frequency and effective hardened layer depth". In the induction hardening apparatus, the relationship between the operating frequency and the effective hardened layer depth may be that the higher the frequency is, the smaller the effective depth is. Therefore, in order to satisfy the requirements for the hardened layer depth of the cam nose and the surface hardness of the cam piece, the operating frequency and heating-cooling conditions are necessary. It is ideal to use the MF band of 5 to 30 KHz, for example, as the frequency capable of obtaining the hardened layer of the cam nose that meets the requirements and heating and cooling in a short time. From the characteristics shown in both figures above, when considering the shape of the cam piece of the camshaft and the depth and surface hardness of the corresponding effective hardened layer, the effective hardened layer is deeper and harder the closer to the top of the cam nose. Must be high. On the other hand, the base circle may have a certain level of both the effective hardened layer and the hardness. Further, if the amount of deformation of the camshaft after induction hardening can be suppressed to a minimum, it is convenient for the subsequent processing. In consideration of the shape of the cam piece and the depth and surface hardness of the effective hardened layer corresponding thereto, the effective hardened layer must be deeper and harder the closer to the top of the nose of the cam portion. On the other hand, the base circle has only to satisfy a certain level. Therefore,
The conventional one uses 30 KHz as the most efficient frequency that can satisfy the required depth and hardness of the hardened layer. 11 and 12 show the heating device 1 and the cooling device 2 which are independently installed, and the upper and lower ends of the cam shaft C of the quenching work are held in an upright state. The heating device 1 has a heating coil 3, and the cooling device 2 has a cooling nozzle 4
Is equipped with. Further, the devices 1 and 2 are equipped with a plurality of receiving rollers 5 and pressing rollers 6 as backup rollers for correcting deformation.
【０００３】[0003]
【発明が解決しようとする課題】反面、高周波焼入れの
欠点としては、急加熱及び急冷却させるため歪が発生し
易くて内部応力が生じることから、一般的には歪の矯正
が必要であり、カムシャフトの場合も例外ではない。但
し、カムシャフトに用いられる鋳鋼材は伸びが非常に小
さく、常温で矯正した場合は品質面で影響を及ぼすが、
高温での矯正は可能であるために、高周波による加熱及
び冷却時に先のようなバックアップ・ローラ５、６で矯
正しながら処理している。そのため、装置のイニシャル
コストが大きく、しかもカムシャフトのみの専用機化す
ることで汎用性が失われて設備が大規模化し、設備コス
トが高騰し、少量生産ではコスト的にも採算がとれない
という問題がある。従って、本発明は、バックアップ・
ローラによる歪矯正を必要とせず、しかもカムシャフト
の変形量を極小に抑えることが可能で、要求される有効
硬化層及び硬さを満足させ、変形量を抑えて後加工のコ
スト低減を狙った鋳鋼カムシャフトの高周波焼入れ方法
及びその装置を提供することを目的としている。更に、
本発明の目的は、カムシャフトに止まらず汎用性のある
高周波焼入れ装置を提供し、少量生産でもコスト的に見
合うように改善することである。On the other hand, as a drawback of induction hardening, distortion is apt to occur due to rapid heating and rapid cooling, and internal stress is generated. Therefore, it is generally necessary to correct the distortion. The case of camshafts is no exception. However, the cast steel used for the camshaft has a very small elongation, and if it is straightened at room temperature, it will affect the quality.
Since it can be straightened at a high temperature, it is processed while being straightened by the backup rollers 5 and 6 when heating and cooling by high frequency. Therefore, the initial cost of the device is high, and by dedicating only the camshaft, versatility is lost, the equipment becomes large in scale, the equipment cost rises, and it is not profitable even in small quantity production. There's a problem. Therefore, the present invention
It does not require distortion correction by rollers and can minimize the amount of deformation of the camshaft, and it satisfies the required effective hardened layer and hardness, and aims to reduce the amount of deformation and reduce the cost of post-processing. An object of the present invention is to provide an induction hardening method and apparatus for a cast steel camshaft. Furthermore,
An object of the present invention is to provide a general-purpose induction hardening apparatus which is not limited to a camshaft and is improved so as to be cost-effective even in small-quantity production.
【０００４】[0004]
【課題を解決するための手段】本発明による鋳鋼カムシ
ャフトの高周波焼入れ方法は、材料基地中に面積比にし
て１８〜２５％の炭化物が分布している鉄系合金の鋳鋼
で、炭化物の形成元素として少なくとも１.５５〜２.１
％のＣ、１４.４〜１５.６％のＣr、０.７〜０.９％の
Ｍｎ、０.７〜１.０％のＭｏ、１.０５〜１.３５％のＳ
i、及び０.１５〜０.２５％のＳを含有するカムシャフ
トを固定治具にセットする準備工程と、カムシャフトを
５〜３０ＫＨｚの高周波によって電圧１２〜１４ＫＶで
１５〜２０秒間加熱する予備加熱及び電圧１５〜１７Ｋ
Ｖで１５〜２０秒間加熱する本加熱の二段階で加熱する
加熱工程と、加熱後のカムシャフトを第１段階でエア噴
射圧力２〜５Ｋｇ／ｃｍ2により２０〜３０秒間空冷
し、続く第２段階で水噴射圧力３〜４Ｋｇ／ｃｍ2によ
り１０〜２０秒間水冷する冷却工程と、からなってい
る。また、装置は、カムシャフトを挿通孔に挿通させて
保持する断熱材で成形された固定治具と、高周波による
多軸加熱コイルを有し挿通孔の同軸上で固定治具の一方
側に取り付けられた加熱部と、挿通孔の同軸上で固定治
具の他方側に加熱部との接触を断って取り付けられた冷
却部と、を含み、同軸上の加熱部及び冷却部にカムシャ
フトを挿通させて加熱及び冷却を二段階で行う構成であ
る。The induction hardening method of a cast steel camshaft according to the present invention is a cast steel of an iron-based alloy in which carbide is distributed in the material matrix in an area ratio of 18 to 25%. At least 1.55-2.1 as an element
% C, 14.4 to 15.6% Cr, 0.7 to 0.9% Mn, 0.7 to 1.0% Mo, 1.05 to 1.35% S
i, and a preparatory step of setting a camshaft containing 0.15 to 0.25% S on a fixing jig, and preliminary heating the camshaft with a high frequency of 5 to 30 KHz at a voltage of 12 to 14 KV for 15 to 20 seconds Heating and voltage 15-17K
A heating step of heating in two steps of main heating for 15 to 20 seconds at V, and a camshaft after heating is air-cooled at an air injection pressure of 2 to 5 Kg / cm 2 for 20 to 30 seconds in the first step, followed by a second step. In the step, a cooling step of cooling with water for 10 to 20 seconds at a water injection pressure of 3 to 4 kg / cm 2 is performed. Also, the device has a fixing jig formed of a heat insulating material that holds the cam shaft through the insertion hole and a multi-axis heating coil with high frequency, and is attached to one side of the fixing jig coaxially with the insertion hole. The heating section and a cooling section mounted on the other side of the fixing jig coaxially with the insertion hole by cutting off contact with the heating section, and inserting the camshaft into the heating section and the cooling section on the same axis. In this configuration, heating and cooling are performed in two steps.
【０００５】[0005]
【作用】高周波焼入れの利点である周波数が小さいほど
有効硬化層深さが大きくなる特性を利用し、３０ＫＨｚ
より小さい周波数を用いて時間をかけてゆっくり加熱す
ることにより、カム部ノーズだけでなくベース円にも均
一に硬化層を発生させる。そしてカム駒内部の組織のバ
ラツキをできるだけ小さくすることにより内部歪を抑
え、カム駒内部及カム駒間の変形を小さくして、カムシ
ャフト全体の変形量を極小に抑える。これによって矯正
用のバックアップローラを使用せずに済む。従って、高
周波による加熱及びその後の冷却時のバックアップ・ロ
ーラによる歪の矯正を行う必要がない。また、時間をか
けてゆっくり加熱することによる生産性の低下は、二軸
による２本同時加熱及び冷却によって解決され、そのう
え、二軸では、一軸による２ケ所同時加熱及び冷却に比
べ熱影響が少ないため、歪を抑えることに関して有効で
ある。本発明での二軸コイルは、３ターンの物を２セッ
ト用意し、カムシャフトの加熱効率を良くするため、３
ターン×２セットすべてに直列結合を採用した。また、
冷却装置のコストダウン及び装置のコンパクト化を図る
ため、加熱−冷却の工程を同一装置で行う方式が採用さ
れている。The advantage of induction hardening is that the smaller the frequency is, the larger the effective hardened layer depth is.
By slowly heating with a smaller frequency over time, a hardened layer is uniformly generated not only on the cam nose but also on the base circle. Then, the internal distortion is suppressed by minimizing the variation of the structure inside the cam piece, the deformation inside the cam piece and between the cam pieces is reduced, and the deformation amount of the entire cam shaft is suppressed to a minimum. This eliminates the need for a straightening backup roller. Therefore, it is not necessary to correct the distortion by the backup roller during heating by high frequency and subsequent cooling. Further, the decrease in productivity due to slow heating over time can be solved by simultaneous heating and cooling of two twin shafts, and the twin shaft has less thermal effect than simultaneous heating and cooling of two places by one shaft. Therefore, it is effective in suppressing distortion. For the biaxial coil of the present invention, two sets of three turns are prepared to improve the heating efficiency of the camshaft.
Series connection was adopted for all 2 sets of turns. Also,
In order to reduce the cost of the cooling device and downsize the device, a method of performing the heating-cooling process in the same device is adopted.
【０００６】[0006]
【実施例】以下、本発明による鋳鋼カムシャフトの高周
波焼入れ方法及びその装置の実施例を図に基づいて説明
する。初めに、本発明を達成する焼入れ材ワークとして
供試される鋳鋼カムシャフトＣの材質は、基地中に面積
比で１５〜２５％の炭化物が分布している鉄系合金材で
あり、炭化物が網目状に形成される鋳鋼材を採用してい
る。炭化物の分布量が１５％以下では耐摩耗性が不足
し、また、２５％を超えて多量に分布させると材料の強
度が低下しかつ脆化する。そのため、炭化物の分布量を
１５〜２５％の範囲とした鋳鋼を用いている。炭化物を
形成する元素として、少なくとも１.５５〜２.１％の
Ｃ、１４.４〜１５.６％のＣr、０.７〜０.９％のＭn、
０.７〜１.０％のＭo、１.０５〜１.３５％のＳi、及び
０.１５〜０.２５％のＳを含有したものが対象となる。Embodiments of an induction hardening method for a cast steel camshaft and an apparatus therefor according to the present invention will be described below with reference to the drawings. First, the material of the cast steel camshaft C, which is tested as a hardened material work for achieving the present invention, is an iron-based alloy material in which 15 to 25% of an area ratio of carbide is distributed in the matrix. A cast steel material formed in a mesh shape is used. If the distribution of carbides is 15% or less, the wear resistance is insufficient, and if it is distributed in excess of 25%, the strength of the material decreases and the material becomes brittle. Therefore, cast steel having a carbide distribution in the range of 15 to 25% is used. As elements forming carbides, at least 1.55 to 2.1% C, 14.4 to 15.6% Cr, 0.7 to 0.9% Mn,
Those containing 0.7 to 1.0% Mo, 1.05 to 1.35% Si, and 0.15 to 0.25% S are of interest.
【０００７】この含有量の範囲で、実施例では、Ｃ；
２.０％、Ｓi；１.２％、Ｃr；１５.０％、Ｍn；０.８
％、Ｓ；０.２％、Ｍo；０.８５％、鉄；残りからなる
組成で鋳造される素材を用い、図４で示されるカムシャ
フトＣのカムトップＣ1で炭化物量２０％のものを得
る。軟化焼鈍後は粗加工を行ない、この後に２０ＫＨz
の周波数による高周波で焼入れ処理する。Within this content range, in the examples, C;
2.0%, Si; 1.2%, Cr; 15.0%, Mn; 0.8
%, S: 0.2%, Mo: 0.85%, iron: A material cast by a composition consisting of the rest is used, and the cam top C 1 of the cam shaft C shown in FIG. 4 has a carbide content of 20%. To get Roughing is performed after softening and annealing, then 20 kHz
Quenching is performed with high frequency depending on the frequency.
【０００８】図１は、本発明による実施例の高周波焼入
れ装置１０を示している。装置１０の場合、従来例の図
１１及び図１２で示された変形矯正用のバックアップ・
ローラは設備されていない。即ち、ベークライト製の固
定治具１１の上側、下側に加熱部２０及び冷却部３０を
取り付けて一体化し、これを２軸並列に設けてそれぞれ
に２つのカムシャフトＣを鉛直方向に挿通させて位置決
めする直列３ターンの二軸コイル方式である。多軸とす
ることにより生産効率、作業性の向上を目標としてい
る。また、加熱時間と冷却時間とのバランスを考慮して
加熱部２０と冷却部３０が固定治具１１を介して一体化
された構造になっている。加熱部２０は図２及び図３で
示す加熱コイル２１に高周波発振装置（図示せず）から
２０ＫＨｚの高周波が付与されるようになっている。冷
却部３０は中心のカムシャフトＣに対してその周囲から
エア、水を噴射して吹き付ける空冷−水冷による二段階
冷却方式である。即ち、急速冷却による変形を抑え、サ
イクルタイムを小さくするために、初めはある一定温度
まで空冷してその後に水冷する。FIG. 1 shows an induction hardening apparatus 10 according to an embodiment of the present invention. In the case of the device 10, a backup for correcting deformation shown in FIGS. 11 and 12 of the conventional example.
Laura is not equipped. That is, the heating unit 20 and the cooling unit 30 are attached and integrated on the upper side and the lower side of the fixing jig 11 made of bakelite, and these are provided in parallel in two axes, and the two cam shafts C are inserted in the respective vertical directions. It is a two-axis coil system with three turns in series for positioning. The multi-axis system aims to improve production efficiency and workability. Further, in consideration of the balance between the heating time and the cooling time, the heating unit 20 and the cooling unit 30 are integrated via the fixing jig 11. The heating unit 20 is configured such that a high frequency of 20 KHz is applied to the heating coil 21 shown in FIGS. 2 and 3 from a high frequency oscillating device (not shown). The cooling unit 30 is a two-stage cooling system using air cooling-water cooling in which air and water are jetted and blown from the periphery of the central camshaft C. That is, in order to suppress deformation due to rapid cooling and reduce the cycle time, air cooling is first performed to a certain temperature and then water cooling is performed.
【０００９】以下はその焼入れ態様である。焼入れにお
いて生産効率をより高めるために、高周波発振装置１台
につき本発明の装置では２台の加熱冷却装置を並列設置
し、一方の加熱冷却装置で加熱中は他方の加熱冷却装置
で冷却が可能である。また、変形量を極小に抑えかつ生
産効率が向上するカムシャフトＣとして製造するため
に、その好適な高周波焼入れ条件を次のように設定し
た。 １）加熱条件 ・予備加熱 加熱電圧 電圧：１３ＫＶ 加熱時間 時間：１７秒 ・本加熱 加熱電圧 電圧：１６ＫＶ 加熱時間 時間：１７秒 ２）冷却条件〔空冷及び水冷による二段階冷却方式〕 ・空冷 空冷圧力；２Ｋg／ｃｍ2 空冷時間；２５秒 ・水冷 水冷圧力；３Ｋg／ｃｍ2 水冷時間；１３秒The following is the hardening mode. In order to further improve the production efficiency in quenching, two heating / cooling devices are installed in parallel in the device of the present invention per one high-frequency oscillator, and while one heating / cooling device is heating, the other heating / cooling device can cool it. Is. Further, in order to manufacture the camshaft C in which the deformation amount is suppressed to a minimum and the production efficiency is improved, the suitable induction hardening conditions are set as follows. 1) Heating conditions-Preheating heating voltage: 13KV Heating time: 17 seconds-Main heating heating voltage: 16KV Heating time: 17 seconds 2) Cooling conditions (two-stage cooling method using air cooling and water cooling) -Air cooling air cooling pressure 2Kg / cm 2 air cooling time; 25 seconds ・ Water cooling water cooling pressure; 3Kg / cm 2 water cooling time; 13 seconds
【００１０】この条件で焼入れを行った結果、カムトッ
プＣ1でＨＲｃ６０以上の硬さのカムシャフトＣが得ら
れた。その後５６０℃で３０分間の焼戻しを施し、規格
値であるＨＲｃ５９以上を十分に満足する硬度のものが
得られ、その他の品質面でも十分満足すべき結果が得ら
れた。As a result of quenching under these conditions, a camshaft C having a hardness of HRc of 60 or more was obtained with the camtop C 1 . After that, tempering was performed at 560 ° C. for 30 minutes, and a hardness that sufficiently satisfies the standard value of HRc59 or more was obtained, and other satisfactory quality results were also obtained.
【００１１】図５及び図６は、従前の焼入れ方式及び本
発明による焼入れ方式におけるカム駒断面の硬さ（Ｈ
ｖ）及び硬化層深さ（ｍｍ）を示したグラフである。図
から明らかなように、図６の本発明による焼入れ方式で
は図５の従前の方法と比較すると、カム部ノーズだけで
はなくベース円Ｃ3にも均一に硬化層が形成されてお
り、しかもその硬化層が深い。従って、それに伴う内部
歪も小さくなって変形量も小さく抑えられている。ま
た、本発明の目標とする変形量を極小に抑える点では、
図７の現状の変形量と、図８の本発明による変形量とを
比較すれば、本発明の場合その目標がいかに達成されて
いるか明らかである。5 and 6 show the hardness (H) of the cross section of the cam piece in the conventional quenching system and the quenching system according to the present invention.
It is a graph which showed v) and the hardened layer depth (mm). As is clear from the figure, in the quenching method according to the present invention of FIG. 6, compared with the conventional method of FIG. 5, a hardened layer is formed uniformly not only on the cam nose but also on the base circle C 3 , and The hardened layer is deep. Therefore, the internal strain associated therewith is also reduced, and the amount of deformation is suppressed to a low level. Further, in terms of suppressing the target deformation amount of the present invention to a minimum,
Comparing the current deformation amount in FIG. 7 with the deformation amount according to the present invention in FIG. 8, it is clear how the target is achieved in the present invention.
【００１２】[0012]
【発明の効果】本発明による鋳鋼カムシャフトの高周波
焼入れ方法では、カム駒内部の硬化層を均一に発生さ
せ、内部歪も小さく抑えられ、カムシャフトとしての変
形量をバックアップ・ローラによる矯正なしでも小さく
抑えることができるので、焼入れ処理後の研磨加工工程
が軽減されて大幅なコスト低減が実現できた。また、設
備に関しても加熱冷却装置をコンパクトに一体化するこ
とができ、イニシャルコストも小さくて済む。According to the induction hardening method for a cast steel camshaft according to the present invention, the hardened layer inside the cam piece is uniformly generated, the internal strain is suppressed small, and the deformation amount as the camshaft is not corrected by the backup roller. Since it can be kept small, the polishing process after the quenching process is reduced, and a significant cost reduction can be realized. Further, regarding equipment, the heating / cooling device can be compactly integrated, and the initial cost can be reduced.
【図１】 本発明による実施例の高周波焼入れ装置の概
略図。FIG. 1 is a schematic view of an induction hardening apparatus according to an embodiment of the present invention.
【図２】 参考に掲載した実施例の加熱部における加熱
コイルの正面図。FIG. 2 is a front view of a heating coil in a heating unit according to an embodiment described for reference.
【図３】 図２の加熱コイルの側面図。3 is a side view of the heating coil of FIG.
【図４】 カムシャフトのカム部の姿図。FIG. 4 is a schematic view of a cam portion of a cam shaft.
【図５】 従来の焼入れ方式で得られた表面からの深さ
と硬さとの相関を示すグラフ。FIG. 5 is a graph showing the correlation between the depth from the surface and the hardness obtained by the conventional quenching method.
【図６】 本発明の焼入れ方法で得られた表面からの深
さと硬さとの相関を示すグラフ。FIG. 6 is a graph showing the correlation between the depth from the surface and the hardness obtained by the quenching method of the present invention.
【図７】 従来の変形量を示すグラフ。FIG. 7 is a graph showing a conventional deformation amount.
【図８】 本発明による変形量を示すグラフ。FIG. 8 is a graph showing the amount of deformation according to the present invention.
【図９】 周波数と浸透深さとの相関を示す一般的なグ
ラフ。FIG. 9 is a general graph showing the correlation between frequency and penetration depth.
【図１０】周波数と有効硬化層深さとの相関を示すグラ
フ。FIG. 10 is a graph showing a correlation between frequency and effective hardened layer depth.
【図１１】従来の焼入れ装置の加熱装置の概略図。FIG. 11 is a schematic view of a heating device of a conventional quenching device.
【図１２】従来の焼入れ装置の冷却装置の概略図。FIG. 12 is a schematic view of a cooling device of a conventional quenching device.
Ｃ・・鋳鋼カムシャフト、１０・・加熱冷却装置、２
０、・・加熱部、３０・・冷却部。C ... Cast steel camshaft, 10 ... Heating / cooling device, 2
0 ... Heating part, 30 ... Cooling part.
Claims (2)
５％の炭化物が分布している鉄系合金の鋳鋼で、炭化物
の形成元素として少なくとも１.５５〜２.１％のＣ、１
４.４〜１５.６％のＣr、０.７〜０.９％のＭｎ、０.７
〜１.０％のＭｏ、１.０５〜１.３５％のＳi、及び０.
１５〜０.２５％のＳを含有するカムシャフトを固定治
具にセットする準備工程、 ｂ． カムシャフトを５〜３０ＫＨｚの高周波によって
電圧１２〜ＫＶで１５〜２０秒間加熱する予備加熱及び
電圧１５〜１７ＫＶで１５〜２０秒間加熱する本加熱の
二段階で加熱する加熱工程、 ｃ． 加熱後のカムシャフトを、第１段階でエア噴射圧
力２〜５Ｋｇ／ｃｍ2により２０〜３０秒間空冷し、続
く第２段階で水噴射圧力３〜４Ｋｇ／ｃｍ2によりで１
０〜２０秒間水冷する冷却工程、を含む鋳鋼カムシャフ
トの高周波焼入れ方法。1. A. 18 to 2 in area ratio in the material base
In an iron-based alloy cast steel in which 5% of carbide is distributed, at least 1.55 to 2.1% C as a carbide forming element, 1
4.4 to 15.6% Cr, 0.7 to 0.9% Mn, 0.7
~ 1.0% Mo, 1.05-1.35% Si, and 0.0.
A preparatory step of setting a camshaft containing 15 to 0.25% S on a fixing jig, b. A heating step of heating the camshaft in two stages of preheating with a high frequency of 5 to 30 KHz at a voltage of 12 to KV for 15 to 20 seconds and main heating with a voltage of 15 to 17 KV for 15 to 20 seconds; c. The heated camshaft is air-cooled at an air injection pressure of 2 to 5 Kg / cm 2 for 20 to 30 seconds in the first stage, and then at a water injection pressure of 3 to 4 Kg / cm 2 in the second stage.
A method of induction hardening a cast steel camshaft, which includes a cooling step of cooling with water for 0 to 20 seconds.
る断熱材で成形された固定治具と、高周波による多軸加
熱コイルを有し挿通孔の同軸上で固定治具の一方側に取
り付けられた加熱部と、挿通孔の同軸上で固定治具の他
方側に加熱部との接触を断って取り付けられた冷却部
と、を含み、同軸上の加熱部及び冷却部にカムシャフト
を挿通させて加熱及び冷却を二段階で行うことを特徴と
する鋳鋼カムシャフトの高周波焼入れ装置。2. A fixing jig formed of a heat insulating material for holding a camshaft inserted through the insertion hole, and a multi-axis heating coil for high frequency, which is attached to one side of the fixing jig coaxially with the insertion hole. The heating section and a cooling section mounted on the other side of the fixing jig coaxially with the insertion hole by cutting off contact with the heating section, and inserting the camshaft into the heating section and the cooling section on the same axis. Induction hardening equipment for cast steel camshafts, characterized in that heating and cooling are performed in two steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4028100A JPH05222458A (en) | 1992-02-14 | 1992-02-14 | Method and device for executing high frequency induction hardening of cast steel cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4028100A JPH05222458A (en) | 1992-02-14 | 1992-02-14 | Method and device for executing high frequency induction hardening of cast steel cam shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05222458A true JPH05222458A (en) | 1993-08-31 |
Family
ID=12239382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4028100A Pending JPH05222458A (en) | 1992-02-14 | 1992-02-14 | Method and device for executing high frequency induction hardening of cast steel cam shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05222458A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6077475A (en) * | 1997-04-18 | 2000-06-20 | Daimlerchrysler Ag | Arrangement and process for the inductive hardening of profiled camshafts |
| US6259076B1 (en) * | 1997-02-06 | 2001-07-10 | Elotherm Gmbh | Method for hardening camshafts and linear inductor for the implementation of said method |
-
1992
- 1992-02-14 JP JP4028100A patent/JPH05222458A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259076B1 (en) * | 1997-02-06 | 2001-07-10 | Elotherm Gmbh | Method for hardening camshafts and linear inductor for the implementation of said method |
| US6077475A (en) * | 1997-04-18 | 2000-06-20 | Daimlerchrysler Ag | Arrangement and process for the inductive hardening of profiled camshafts |
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