JPS63109119A - Method for heat treatment of caterpillar bush - Google Patents
Method for heat treatment of caterpillar bushInfo
- Publication number
- JPS63109119A JPS63109119A JP25462386A JP25462386A JPS63109119A JP S63109119 A JPS63109119 A JP S63109119A JP 25462386 A JP25462386 A JP 25462386A JP 25462386 A JP25462386 A JP 25462386A JP S63109119 A JPS63109119 A JP S63109119A
- Authority
- JP
- Japan
- Prior art keywords
- circumferential surface
- inner circumferential
- tempering
- bush
- outer circumferential
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 35
- 241001300831 Ormocarpum trichocarpum Species 0.000 title abstract 3
- 238000005496 tempering Methods 0.000 claims abstract description 24
- 230000006698 induction Effects 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 12
- 229910001566 austenite Inorganic materials 0.000 abstract description 11
- 238000010791 quenching Methods 0.000 abstract description 11
- 230000000171 quenching effect Effects 0.000 abstract description 11
- 230000006866 deterioration Effects 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 23
- 239000000047 product Substances 0.000 description 20
- 238000007670 refining Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 206010010071 Coma Diseases 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical compound [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Classifications
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、装軌車両などに用いる履帯のブツシュの熱処
理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for heat treating bushings of crawlers used in tracked vehicles and the like.
装軌車両などに用いる履帯１は、第１図および第２図に
示すように、シュー２、シュー締付はポルト３、シュー
締付ナツト４、リンク５．６、ブツシュ７、ダストシー
ル８、ピン９をもって、その−単位が構成されている。As shown in FIGS. 1 and 2, a crawler track 1 used for a tracked vehicle, etc. includes a shoe 2, a port 3 for shoe tightening, a shoe tightening nut 4, a link 5.6, a bush 7, a dust seal 8, and a pin. 9 constitutes the - unit.
履帯１に用いられるブツシュ７は、その内周面７ａおよ
び外周面７ｂに耐摩耗性が要求されるとともに、ブツシ
ュ７に加わる負荷に耐えるための強度、靭性、疲労強度
が要求される。したがって、従来、履帯用ブツシュには
、上記の要求品質を満足するため、熱処理が施される。The bushing 7 used in the crawler track 1 is required to have wear resistance on its inner circumferential surface 7a and outer circumferential surface 7b, and is also required to have strength, toughness, and fatigue strength to withstand the load applied to the bushing 7. Therefore, conventionally, track bushings are subjected to heat treatment in order to satisfy the above-mentioned required quality.
従来の熱処理方法には、（イ）肌焼ｍ（たとえばＪ Ｉ
ｓ、、ＳＣＭ４１５．４２０）を素材とし、これに浸炭
焼入した後に焼戻す方法（特公昭５２−３４８０６号公
報）や、（ロ）中炭素低合金鋼（たとえばＪ Ｉｓ、、
ＳＣＭ４３５．５Ｃｒ４３５Ｂ、５Ｃｒ４４０Ｂ）を素
材として、これを調質して板厚の中心部に柔らかい延性
部を作り、その後外周、内周両表面に高周波焼入を施し
、さらにその後焼戻す方法（特開昭５９−７７９７９号
公報の従来技術の説明）、などがある。Conventional heat treatment methods include (a) case hardening (for example, J I
s, SCM415.420) as a material, carburizing and quenching it and then tempering it (Japanese Patent Publication No. 52-34806), (b) medium carbon low alloy steel (for example, J Is, ,
SCM435.5Cr435B, 5Cr440B) is used as a material, it is tempered to create a soft ductile part at the center of the plate thickness, then induction hardened on both the outer and inner surfaces, and then tempered. Description of the prior art in Publication No. 59-77979), etc.
しかし、上記Ｕ＠質を含む（ロ）の方法においては、中
炭素低合金鋼を過熱炉内においてＡ Ｃｓ点以上の温度
に加熱し、油焼入を行なった後６００℃前後の温度で焼
戻しすることによって調質を行なっているため、処理時
間が長かったり、処理工程が多いなど、作業能率が悪い
という欠点があった。However, in the method (b), which includes the above-mentioned U@ quality, medium carbon low alloy steel is heated to a temperature above the A Cs point in a superheating furnace, oil quenched, and then tempered at a temperature of around 600°C. Since thermal refining is carried out by doing this, there are drawbacks such as a long processing time and a large number of processing steps, resulting in poor work efficiency.
そこで、これを改善するために、素材の調質を省略した
履帯ブツシュの高周波誘導加熱焼入方法、「ｙ！帯用ブ
ッシングおよびその生産方法」が、本特許出願人により
、特願昭５７−１７９９８０号で提案されている（特開
昭５９−７７９７９号公報）。Therefore, in order to improve this, the applicant of the present patent has proposed a high-frequency induction heating quenching method for track bushings that omits the thermal refining of the material, "Y!Bushing for bushings and its production method," which was filed in Japanese Patent Application No. 1983- This is proposed in No. 179980 (Japanese Unexamined Patent Publication No. 77979/1983).
（発明が解決しようとする１０１題点〕しかしながら、
上記特願昭５７−１７９９８０号発明においても、■外
周表面の高周波焼入、■内周表面の高周波焼入、■焼戻
しの３工程が必要であった。(101 problems that the invention attempts to solve) However,
The invention of Japanese Patent Application No. 57-179980 also required three steps: (1) induction hardening of the outer circumferential surface, (2) induction hardening of the inner circumferential surface, and (2) tempering.
そこで、さらに少ない工程で処理でき、しかもブツシュ
の耐摩耗性や疲労強度、靭性を劣化させない熱処理方法
の開発が望まれる。Therefore, it is desired to develop a heat treatment method that can be processed in fewer steps and that does not deteriorate the wear resistance, fatigue strength, or toughness of the bush.
本発明の目的は、特願昭５７−１７９９８０号発明より
、さらに処理工程が少なく、しかも耐摩耗性、疲労強度
、靭性を劣化させない、履帯ブツシュの熱処理方法を提
供することにある。An object of the present invention is to provide a method for heat treating track bushings which requires fewer processing steps than the invention of Japanese Patent Application No. 57-179980 and which does not deteriorate wear resistance, fatigue strength, or toughness.
上記目的を達成するための本発明に係る履帯ブツシュの
熱処理方法は、中炭素低合金鋼を素材とする履帯ブツシ
ュに外周表面のみから内周面をＡＣ１点直上の温度にす
る高周波誘導加熱ならびに冷却を施して腹帯ブツシュの
肉厚全体を焼入し、その後焼戻しする熱処理方法からな
る。In order to achieve the above object, the heat treatment method for a track bushing according to the present invention includes high-frequency induction heating and cooling of a track bushing made of medium-carbon, low-alloy steel, from only the outer peripheral surface to the inner peripheral surface to a temperature just above 1 AC point. It consists of a heat treatment method in which the entire thickness of the belly band bushing is hardened by subjecting it to heat treatment, and then tempered.
上記熱処理方法において、焼戻しは、加熱炉内にて１５
０〜２５０℃に焼戻すか、あるいは、内周からの高周波
誘導加熱によって内周表面を加熱して焼戻すか、によっ
て行なわれる。In the above heat treatment method, tempering is performed in a heating furnace for 15 minutes.
This is done by tempering to 0 to 250°C, or by heating the inner circumferential surface by high-frequency induction heating from the inner circumference.
内周からの高周波誘導加熱による焼戻しをする場合は、
外周表面は、内周面を焼戻すときの熱伝導を利用し、″
内周表面より低い温度で焼戻しする。When tempering by high frequency induction heating from the inner circumference,
The outer peripheral surface uses heat conduction when tempering the inner peripheral surface,
Temper at a lower temperature than the inner peripheral surface.
特願昭５７４７９９１３０号公報の従来の熱処理方法に
よって製造されたブツシュは、炉中焼戻しのため内周、
外周表面の硬さは同じで、ＨＩＣ５０〜６２程度の硬さ
にあり、耐摩耗性が優れていると同時に、肉厚中央部は
＋（、Ｃ２０〜４０程度の硬さになっており、ブツシュ
全体の靭性を保つのに役立っている。The bushing manufactured by the conventional heat treatment method disclosed in Japanese Patent Application No. 574799130 has inner periphery,
The hardness of the outer peripheral surface is the same, about HIC50 to 62, and has excellent wear resistance, while the thick center part has a hardness of about +(, C20 to 40), and the bush It helps maintain overall toughness.
当該ブツシュの内周、外周表面付近の旧オーステナイト
結晶粒度は、生産性を考慮し、実用上問題ない範囲ＪＩ
ＳＧＯ５５１による（結晶粒度７程度）になっている。Considering productivity, the prior austenite crystal grain size near the inner and outer surfaces of the bushing is within the range JI that does not cause any practical problems.
Due to SGO551 (crystal grain size about 7).
これに対し、本発明に係るブツシュの熱処理方法では、
外周表面からのみの、高周波誘導加熱および冷却のため
、焼入加熱段階において、外周表面から内周表面に温度
勾配がつけられるため、加熱外周面から最も離れた内周
表面の温度を、変態温度ＡＣ，Ｃ立点の温度にコントロ
ールでき、これによって内周面の旧オーステナイト結晶
粒度の粗大化を抑制できる。したがって、本発明の熱処
理方法によって得られるブツシュの内周表面の旧オース
テナイト結晶粒は微細で、これによって靭性と疲労強度
が向上される。On the other hand, in the bush heat treatment method according to the present invention,
Due to high-frequency induction heating and cooling only from the outer peripheral surface, a temperature gradient is created from the outer peripheral surface to the inner peripheral surface during the quenching heating stage, so the temperature of the inner peripheral surface farthest from the heated outer peripheral surface is the transformation temperature. The temperature can be controlled to the AC and C standing points, thereby suppressing coarsening of the prior austenite crystal grain size on the inner peripheral surface. Therefore, the prior austenite crystal grains on the inner circumferential surface of the bushing obtained by the heat treatment method of the present invention are fine, thereby improving toughness and fatigue strength.
さらに、本発明の熱処理方法は、外周表面のみから加熱
して冷却する焼入方法であるから、ブツシュの内周表面
には圧縮の残留応力が付与される。Furthermore, since the heat treatment method of the present invention is a hardening method that heats and cools only the outer circumferential surface, compressive residual stress is imparted to the inner circumferential surface of the bushing.
この圧縮残留応力は疲労強度を向上させる。This compressive residual stress improves fatigue strength.
本発明の熱処理方法では、焼入前の調質工程はなく、か
つ焼入工程における内周側からの焼入工程もないために
、前記特願昭５７−１７９９８０号発明にくらべても内
周表面の高周波焼入工程骨、工程酸がはかられている。In the heat treatment method of the present invention, there is no thermal refining process before quenching, and there is no quenching process from the inner periphery side in the quenching process. The surface is treated with induction hardening process bones and process acid.
本発明によって製造されたブツシュは、外周表面からの
加熱、冷却による焼入を経て製造されるので、全肉厚が
Ｈ，Ｃ５０〜６２程度に硬化され、これは表面の耐摩耗
性に非常によ゛いが、靭性が犠牲になるので、靭性のカ
バーを、上記の結晶粒の微細化で、実用上問題ない程度
迄に行なっている点が特徴である。Since the bushing manufactured according to the present invention is manufactured through quenching by heating and cooling from the outer peripheral surface, the entire wall thickness is hardened to about H, C50 to 62, which has a very high wear resistance on the surface. However, the toughness is sacrificed, so the feature is that the toughness is covered by the above-mentioned grain refinement to the extent that there is no problem in practical use.
以下に、本発明の履帯ブツシュの熱処理方法に係る望ま
しい実施例を、第３図ないし第７図を参照して説明する
。Hereinafter, preferred embodiments of the method of heat treating track bushings of the present invention will be described with reference to FIGS. 3 to 7.
本発明を工程順に説明する。The present invention will be explained step by step.
第１工程 中炭素低合金鋼を素材とする筒状の履帯プツシ 。1st step A cylindrical track pusher made of medium-carbon, low-alloy steel.
ユを機械加工して用意する。試験には、中炭素低合金鋼
として、第１表に示す中炭素クロム、ボロン鋼を用いて
、供試材を作成した。Prepare by machining the yu. For the test, test materials were prepared using medium carbon chromium and boron steels shown in Table 1 as medium carbon low alloy steels.
第２工程
履帯ブツシュの供試材を、筒状体の外周表面のみから、
周波数２．５にＨｚの高周波誘導電流によって加熱する
。このとき、高周波条件を調整して、内周表面付近の温
度を、変態点Ａ Ｃｓ点画上の温度にする。加熱直後、
外周表面のみから冷却し、外周表面から全肉厚にわたっ
て焼入する。その結果第２表に示すように、内周表面付
近の旧オーステナイト結晶粒が、微細になる。The sample material of the second step crawler bushing is extracted from only the outer peripheral surface of the cylindrical body.
Heating is performed by a high frequency induced current at a frequency of 2.5 Hz. At this time, the high frequency conditions are adjusted to bring the temperature near the inner circumferential surface to the temperature on the transformation point ACs stipple. Immediately after heating,
Cool only from the outer circumferential surface and harden the entire wall thickness from the outer circumferential surface. As a result, as shown in Table 2, the prior austenite crystal grains near the inner peripheral surface become fine.
１注）旧オーステナイト結晶粒度測定はＪＩＳＧ’
０５５１による。1 Note) Prior austenite grain size measurement is JISG'
According to 0551.
上表より明らかなように、内周表面付近結晶粒度は、約
９．４であり、従来の前記結晶粒度７に比べて、さらに
微細化されている。As is clear from the above table, the crystal grain size near the inner circumferential surface is about 9.4, which is even finer than the conventional crystal grain size of 7.
第３工程
焼入後の供試材を、焼戻しする。焼戻しには、１５０℃
〜２５０℃の炉中焼戻しと、内周表面からの高周波誘導
加熱による焼戻しとの、２つの方法が適用でき、何れの
方法によってもよい。The sample material after the third step quenching is tempered. 150℃ for tempering
Two methods can be applied: tempering in a furnace at ~250°C and tempering by high-frequency induction heating from the inner circumferential surface, and either method may be used.
試験では、炉中で２００℃に焼戻しする炉中焼戻しを用
いた。１５０℃〜２５０℃の範囲は、焼入による実用上
の有効硬さをそこなわずに焼戻しできる範囲である。そ
の結果の供試材の厚さ方向の硬さ分布を第３図に示しで
ある。第３図に示すように、外周表面、芯部、内周表面
ともほぼ同−硬さが得られた。ロックウェル硬さで、Ｈ
ＩＣ５０近傍以上は、ブツシュの内周表面、外周表面に
、十分な耐摩耗性を与える硬さである。In the test, in-furnace tempering was used in which the material was tempered to 200°C in a furnace. The range of 150°C to 250°C is the range in which tempering can be performed without damaging the practically effective hardness due to quenching. The resulting hardness distribution in the thickness direction of the sample material is shown in FIG. As shown in FIG. 3, almost the same hardness was obtained for the outer circumferential surface, core portion, and inner circumferential surface. Rockwell hardness: H
A hardness near IC50 or higher is a hardness that provides sufficient wear resistance to the inner and outer peripheral surfaces of the bushing.
内周表面からの高周波誘導加熱による焼戻しを適用する
場合は、内周表面を２００〜２５０℃程度に加熱し、外
周表面は内周面を焼戻すときの熱伝導を利用して、内周
表面より低い温度（約１７０℃）に焼戻す、このときに
焼戻し後得られる硬さは、内周表面でＨＩＣ５０〜６０
であり、外周表面は焼入のままの硬さが保持できる。When applying tempering by high-frequency induction heating from the inner circumferential surface, the inner circumferential surface is heated to about 200 to 250°C, and the outer circumferential surface is heated to about 200 to 250°C, and the outer circumferential surface is Tempering at a lower temperature (approximately 170°C), the hardness obtained after tempering at this time is HIC50-60 on the inner peripheral surface.
Therefore, the outer peripheral surface can maintain the same hardness as quenched.
第４回は、同一化学成分、同一炉中焼戻しにおける本発
明品と従来品の疲労特性比較を示している。第４図から
、本発明方法によって得られるブツシュの疲労特性が、
調質後高周波焼入焼戻し品および調質なし高周波焼入焼
戻し品と、はぼ同等であることが判明する。Part 4 shows a comparison of the fatigue properties of a product of the present invention and a conventional product with the same chemical composition and tempering in the same furnace. From FIG. 4, the fatigue properties of the bushing obtained by the method of the present invention are as follows:
It is found that the product is almost equivalent to the induction quenched and tempered product after thermal refining and the induction quenched and tempered product without thermal refining.
第６図は、高荷重域の亀裂発生繰返し数と内周表面付近
の旧オーステナイト結晶粒度との関係を示している。第
６図から結晶粒が微細であると、高荷重域の亀裂発生繰
返し数が多くなる、すなわち亀裂を発生しにくくなるこ
と、が判明する。第６図はまた、本発明品の旧オーステ
ナイト結晶粒度が９以上で、従来の、調質後高周波焼入
、炉中焼戻し品の７．２ 、ｍ質なし高周波焼入炉中焼
戻し品のほぼ７．０に比べて、結晶粒度番号が大、すな
わち結晶粒が微細化され、耐亀裂発生に対しては従来品
より優れていることを示している。FIG. 6 shows the relationship between the number of crack occurrence cycles in the high load region and the prior austenite grain size near the inner circumferential surface. It is clear from FIG. 6 that when the crystal grains are fine, the number of repetitions of crack generation in the high load region increases, that is, it becomes difficult to generate cracks. Figure 6 also shows that the prior austenite grain size of the product of the present invention is 9 or more, 7.2 of the conventional product that was induction quenched after heat refining and tempered in a furnace, and approximately 7.2 of the product that was induction quenched and tempered in a furnace without M quality. Compared to 7.0, the crystal grain size number is larger, that is, the crystal grains are finer, indicating that it is superior to conventional products in terms of resistance to cracking.
さらに、外周のみからの加熱冷却による焼入と、焼戻し
工程を経た供試材には、内周表面に圧縮残留応力が生じ
ている。第７図は、同一化学成分、同一炉中焼戻しにお
ける、本発明品の残留応力分布比較を示している。第７
図から、本発明品の内周表面付近の残留応力が圧縮にな
っていることが判明する。Furthermore, compressive residual stress is generated on the inner circumferential surface of the sample material that has been quenched by heating and cooling only from the outer circumference and tempered. FIG. 7 shows a comparison of residual stress distributions of products of the present invention with the same chemical composition and tempering in the same furnace. 7th
From the figure, it is clear that the residual stress near the inner circumferential surface of the product of the present invention is compressive.
第４工程
焼戻された供試材の外周表面のみを仕上研摩加工し、最
終製品を得る。Fourth step: Finish polishing only the outer peripheral surface of the tempered specimen to obtain a final product.
本発明の方法は、上記の第２工程および第３工程にわた
って存在する。The method of the present invention exists over the above-mentioned second and third steps.
本発明の履帯ブッシェの熱処理方法によるときは、次に
あげる効果が得られる。The following effects can be obtained by using the method of heat treating a crawler bushing according to the present invention.
イ、外周表面からの高周波誘導加熱および冷却による焼
入とその後の焼戻しの組合せによって、焼入前の調質工
程、焼入時の内周表面焼入工程を不要とすることができ
、熱処理工数の低減をはかることができる。B. By combining hardening by high-frequency induction heating and cooling from the outer peripheral surface and subsequent tempering, it is possible to eliminate the need for a thermal refining process before hardening and an inner peripheral surface hardening process during hardening, reducing the number of heat treatment steps. can be reduced.
口、焼入によって全肉厚がＨＲＣ５０〜６２程度に硬化
されており、内周表面、外周表面の耐摩耗性を良好に出
すことができる。The entire wall thickness is hardened to about HRC50 to 62 by hardening and hardening, and the inner and outer peripheral surfaces can exhibit good wear resistance.
ハ、全肉厚硬化にかかわらず、外周表面のみからの、内
周面をＡ Ｃｓ点直上の温度にする高周波誘導加熱によ
って、内周表面の旧オーステナイト結晶粒を微細化でき
、疲労強度、靭性を従来品に比べて遜色ない程度または
それ以上に向上できる。C. Regardless of full wall thickness hardening, high-frequency induction heating from only the outer circumferential surface to bring the inner circumferential surface to a temperature just above the A Cs point can refine the prior austenite crystal grains on the inner circumferential surface, improving fatigue strength and toughness. can be improved to a comparable or even higher level than conventional products.
二、外周表面のみからの加熱および冷却による焼入と、
その後の焼戻しの組合せによって、内周表面に圧縮残留
応力を生成でき、疲労強度が向上する。2. Hardening by heating and cooling only from the outer peripheral surface,
The combination of subsequent tempering can generate compressive residual stress on the inner circumferential surface, improving fatigue strength.
第１図は一般の履帯の分解斜視図、
第２図は一般の履帯ブツシュの断面図、第３図は本発明
品の断面硬さ分布図、
第４図は本発明品と従来品の、亀裂発生繰返し数−荷重
特性の、比較図、
第５図は本発明品と従来品の圧壊荷重比較図、第６図は
本発明品と従来品の、旧オーステナイト結晶粒度番号と
荷重１８．７ｔｏｎ（高荷重域）における亀裂発生繰返
し数特性の、比較図、
第７図は本発明品の残留応力分布図、
である。
７・・・・・・履帯ブツシュ
特 許 出 願 人 トピー工業株式会社伺面の浄ｄ
仔５迂に変更なＬ）
第６図
旧オーステナイト結晶粒度爵号
手続ネ１））τ１′：Ｌ昏！４（７５式）昭和６２年
１月３０ し＋Fig. 1 is an exploded perspective view of a general crawler belt, Fig. 2 is a sectional view of a general crawler bushing, Fig. 3 is a cross-sectional hardness distribution diagram of the product of the present invention, and Fig. 4 is a diagram of the product of the present invention and the conventional product. Figure 5 is a comparison diagram of the crushing load of the product of the present invention and the conventional product. Figure 6 is the former austenite grain size number and load of 18.7 tons for the product of the present invention and the conventional product. Figure 7 is a residual stress distribution diagram of the product of the present invention. 7... Crawler Bush Patent Applicant Topy Industries Co., Ltd.
Figure 6 Old austenite grain size procedure 1)) τ1': L coma! 4 (Type 75) 1986
January 30 +
Claims (4)
表面のみから内周面をＡＣ＿３点直上の温度にする高周
波誘導加熱ならびに冷却を施して履帯ブッシュの肉厚全
体を焼入し、その後焼戻しすることを特徴とする履帯ブ
ッシュの熱処理方法。(1) High-frequency induction heating and cooling are applied to the track bushing made of medium carbon low alloy steel to a temperature just above the AC_3 point from the outer circumferential surface only to the inner circumferential surface to harden the entire thickness of the track bushing, and then A method for heat treatment of a track bushing, characterized by tempering it.
度で行なう特許請求の範囲第１項記載の履帯ブッシュの
熱処理方法。(2) The method of heat treating a crawler bushing according to claim 1, wherein the tempering is performed at a temperature of 150 to 250°C in a heating furnace.
加熱して内周面を焼戻しする特許請求の範囲第１項記載
の履帯ブッシュの熱処理方法。(3) The method for heat treatment of a track bushing according to claim 1, wherein the tempering is performed by heating the inner circumferential surface by high-frequency induction heating to temper the inner circumferential surface.
内周面より低い温度で焼戻す特許請求の範囲第３項記載
の履帯ブッシュの熱処理方法。(4) The method of heat treating a track bushing according to claim 3, in which the outer circumferential surface is tempered at a lower temperature than the inner circumferential surface by utilizing heat conduction when tempering the inner circumferential surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25462386A JPS63109119A (en) | 1986-10-28 | 1986-10-28 | Method for heat treatment of caterpillar bush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25462386A JPS63109119A (en) | 1986-10-28 | 1986-10-28 | Method for heat treatment of caterpillar bush |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63109119A true JPS63109119A (en) | 1988-05-13 |
| JPH0137453B2 JPH0137453B2 (en) | 1989-08-07 |
Family
ID=17267599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25462386A Granted JPS63109119A (en) | 1986-10-28 | 1986-10-28 | Method for heat treatment of caterpillar bush |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63109119A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0270022A (en) * | 1988-09-05 | 1990-03-08 | Topy Ind Ltd | Heat treatment of bushing used for track of trackless vehicle |
| JPH02169375A (en) * | 1988-12-21 | 1990-06-29 | Topy Ind Ltd | Crawler bushing and manufacture thereof |
| CN103540716A (en) * | 2013-09-22 | 2014-01-29 | 徐州徐工铁路装备有限公司 | Processing method of tread thermal treatment for caterpillar link |
| JP2015010238A (en) * | 2013-06-26 | 2015-01-19 | 高周波熱錬株式会社 | Heat treatment method |
-
1986
- 1986-10-28 JP JP25462386A patent/JPS63109119A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0270022A (en) * | 1988-09-05 | 1990-03-08 | Topy Ind Ltd | Heat treatment of bushing used for track of trackless vehicle |
| JPH02169375A (en) * | 1988-12-21 | 1990-06-29 | Topy Ind Ltd | Crawler bushing and manufacture thereof |
| JP2015010238A (en) * | 2013-06-26 | 2015-01-19 | 高周波熱錬株式会社 | Heat treatment method |
| CN103540716A (en) * | 2013-09-22 | 2014-01-29 | 徐州徐工铁路装备有限公司 | Processing method of tread thermal treatment for caterpillar link |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0137453B2 (en) | 1989-08-07 |
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