JPH01259129A - Bushing for track containing carbon at about middle ratio and production thereof - Google Patents
Bushing for track containing carbon at about middle ratio and production thereofInfo
- Publication number
- JPH01259129A JPH01259129A JP8733888A JP8733888A JPH01259129A JP H01259129 A JPH01259129 A JP H01259129A JP 8733888 A JP8733888 A JP 8733888A JP 8733888 A JP8733888 A JP 8733888A JP H01259129 A JPH01259129 A JP H01259129A
- Authority
- JP
- Japan
- Prior art keywords
- bushing
- layer
- hardening
- effective
- hardened
- 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.)
- Pending
Links
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract 2
- 238000003303 reheating Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 50
- 238000010791 quenching Methods 0.000 claims description 25
- 238000005255 carburizing Methods 0.000 claims description 23
- 230000000171 quenching effect Effects 0.000 claims description 23
- 230000006698 induction Effects 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 19
- 238000005496 tempering Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 238000007796 conventional method Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 35
- 238000012360 testing method Methods 0.000 description 26
- 229910000760 Hardened steel Inorganic materials 0.000 description 7
- 239000000523 sample Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000009661 fatigue test Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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１
本発明は装軌車輌などに用いる履帯用ブッシングの熱処
理に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to heat treatment of track bushings used in tracked vehicles and the like.
［従来の技術］
装軌車輌などに用いる履帯１は第１図及び第２図に示す
ようにシュー２、シュー締付は小ル１〜３、シューナツ
ト４、リンク５．６、ブッシング７、ジス１〜シール８
、ピン９をもって、その−単位か構成されている。腹帯
に用いられるブツシング７は、その内周面７ａ及び外周
面７ｂに耐摩耗性が要求されると共に、ブッシング７に
加わる負荷に耐えるための、強度、靭性か要求される。[Prior Art] As shown in FIGS. 1 and 2, a crawler track 1 used for a tracked vehicle etc. includes a shoe 2, shoe tightening tools 1 to 3, a shoe nut 4, a link 5.6, a bushing 7, and a screw. 1~Seal 8
, the unit is constructed with pin 9. The bushing 7 used for the belly band is required to have wear resistance on its inner circumferential surface 7a and outer circumferential surface 7b, and is also required to have strength and toughness to withstand the load applied to the bushing 7.
そのため芯部には肌焼鋼の焼入層や中炭素鋼の調￥ｉＩ
層７ｄが設りられる。したがって、従来、履帯用ブッシ
ングには、上記要求晶質を満足するため、熱処理か施さ
れる。Therefore, the core has a hardened layer of case hardened steel and a hardened layer of medium carbon steel.
A layer 7d is provided. Therefore, conventionally, track bushings are subjected to heat treatment in order to satisfy the above-mentioned required crystallinity.
従来の熱処理方法には、
イ）肌焼鋼（例えばＪＩＳ 、 ＳＣ旧１５）を素材と
し、これに浸炭焼入をした後に焼戻す方法（特公昭５２
〜３４８６号公報）や、
Ｉ 中炭素低合金鋼（例えば、日本自動車工業量規格、
ＡＳＣＢ４０１１ ＞を素４Δ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）、
ぐ９ 史に進んで（ｎと同様の中炭素低合金鋼を用いて
外周から焼入れで内周表面に未硬化層が又（、Ｊ、不完
全か１１人層を、残づ様にし、その後内周から焼入れて
内周硬化層を生成すると同１１、）に、内周硬化層に隣
接する外周から焼入れだ硬化層の一部を焼戻し、結果と
して内外硬化層を生成ざｌ、その中間の芯部に焼戻し層
を生成ざＵるノ′−Ｊ法［肛帯用）゛ツシングおよびそ
の生産方法」か、本出願人により、特願昭５７−１７９
９８０号で提案され（いる（特開昭５９−７７ ’９７
９号公報）。Conventional heat treatment methods include a) a method in which case-hardened steel (e.g., JIS, SC old 15) is used as a material, carburized and quenched, and then tempered (Special Publication No. 52);
-3486), I medium carbon low alloy steel (e.g. Japanese Automobile Industry Standards,
ASCB4011> is made into a base 4Δ, which 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 (JP-A-59- Explanation of the prior art in Publication No. 77979), 9 Going forward, a medium-carbon low alloy steel similar to n was quenched from the outer periphery to form an unhardened layer on the inner periphery surface (, J, incomplete or 11 11), a part of the hardened layer is quenched from the outer periphery adjacent to the inner hardened layer, and as a result, the inside and outside are hardened. ``J method [for anal cord) and production method thereof'', in which a hardened layer is formed and a tempered layer is formed in the core portion between the two, and the same is disclosed in Japanese Patent Application No. 57-179 by the present applicant.
It was proposed in No. 980.
Publication No. 9).
［発明が解決しようどする課題］
上記特願昭５７−１７９９ Ｆ２Ｏ号［ｔ／最のｈ法］
は、（２）の方法が断面硬さ分イｌｉか０字型を呈して
いるのに対し、Ｖ字型を呈している。その結果全体とし
て、硬化面積か人ぎく結果として強さも大きく、焼入焼
戻しの加熱に急速加熱を用い゛（いる為に靭性も良い。[Problem to be solved by the invention] The above patent application No. 1799, F2O [t/most h method]
The method (2) has a V-shape, whereas the method (2) has a 0-shape due to the cross-sectional hardness. As a result, as a result of the hardening area, the strength is large, and the toughness is also good because rapid heating is used for quenching and tempering.
（【」の方法・し、内外周からの高周波焼入の深さを大
ぎく覆れば、＼／字型の断面硬さを得られようか、それ
４は、前−に稈のブッシング全体の焼〕い焼戻が意味を
為さなくなる。(If the depth of induction hardening from the inner and outer peripheries is covered as much as possible using the method [ ], it is possible to obtain a ＼/-shaped cross-sectional hardness. The process of tempering becomes meaningless.
この方法（ｎは、上記の様な特性を備えているから容易
に表面の有効硬化層を厚く取り得る長所を持っている。This method (n) has the advantage of easily forming a thick effective hardened layer on the surface because it has the above-mentioned characteristics.
しかし、この方法は、：１肖に４Ａ貿にこだわりＬ’Ｊ
、 ７３いか、主として中炭素を含む４Ｊ Ｎ’ｉ＋を
強さの関係から、主な対象としている。However, this method: L'J focuses on 4A trade in 1.
, 73 or 4J N'i+, which mainly contains medium carbon, is the main target due to its strength.
ブッシングの寿命は耐摩性で決まるので、更に寿命延長
を計るには耐摩耗性を一層向上さけると同時に、強度、
靭性等を劣化さＩ！ない方法が望まれる。The life of a bushing is determined by its wear resistance, so in order to further extend its life, it is necessary to further improve its wear resistance, and at the same time increase its strength and
Deterioration of toughness etc. I! A method without this is desired.
上記の機械的性質を劣化させないで耐摩性を向上させる
方法は、前述のげ）の如く肌焼鋼を使って浸炭焼入する
ノ）法が一般的に用いられる。しかし浸炭焼入は処理時
間か長いのて、コストかかかる。As a method for improving wear resistance without deteriorating the mechanical properties mentioned above, the method (2) in which case hardening steel is used and carburized and quenched as in (2) above is generally used. However, carburizing and quenching takes a long time and is costly.
本発明の目的は、同−有効浸炭硬化層深さを得るための
浸炭時間を削減し、一般的に用いられる肌焼鋼を浸炭焼
入れする前述ピ）の方法で得られる強度、靭性等の機械
的・＋４１貿か、同等又は、それ以」−の値を示Ｔｌ１
１児帯用シツシングの熱処理方法を提供することにある
。The purpose of the present invention is to reduce the carburizing time in order to obtain the same effective carburized layer depth, and to improve the strength, toughness, etc. obtained by the above-mentioned method of carburizing and quenching commonly used case hardening steel. Indicates a value of +41 trade, equivalent or greater.
An object of the present invention is to provide a heat treatment method for one-child belt stuffing.
［課題を解決するための手段］
上記目的を達成するための本発明に係る履帯用ブッシン
グ熱処理方法は中炭素を素材とするブッシングに、適当
な方法で浸炭を行い、焼入をせすｊ３−
に常温迄冷却する。[Means for Solving the Problems] A track bushing heat treatment method according to the present invention to achieve the above object involves carburizing and quenching a bushing made of medium carbon by an appropriate method. Cool to room temperature.
その後焼入、焼戻η方法として、特願昭５７−１９９８
０号前記Ｑ）の方法を採用するので必る。After that, as a quenching and tempering method, the patent application No. 57-1998
No. 0 This is necessary because the method described in Q) above is adopted.
ずなわら、第１工程でそのブッシング索（Δの軸線を中
心にして回転さ一層つつ、製品をコイルに対し移動させ
、その外周面に高周波焼入を副刃。フッシング素材を回
転させる理由は、外周面、全面に渡って均一な高周波焼
入を施すためである、。In the first step, the bushing cable (Δ) is rotated around the axis, and the product is moved relative to the coil, and the outer circumferential surface is induction hardened.The reason for rotating the bushing material is This is to apply uniform induction hardening to the entire outer circumferential surface.
この高周波焼入に当っては、ブッシング索（Ａの内周面
を大略ＨＲｃ６０程度以上のｌｌ１ｌ！度にならないよ
うにすると共に、外周面から内周有効硬化層の一部に至
る迄（内周浸炭層と素材が含有する炭素量のままの境界
に至る迄）の範囲を素祠有効硬さ以上の硬度にすること
が必要である。ここで言う索材右効硬ざとは索４Ａの含
有する炭素量の鋼の８（）％ヱルテンサイ１〜硬さをも
って定義する。During this induction hardening, the inner circumferential surface of the bushing cable (A) should not be heated to an HRc of about 60 or more, and the inner circumferential surface should be heated from the outer circumferential surface to a part of the inner effective hardened layer (inner circumferential It is necessary to make the range (up to the boundary between the carburized layer and the carbon content of the material unchanged) to a hardness greater than the effective hardness of the clay.The term "rope hardness" here refers to the content of cable 4A. It is defined as the hardness of steel with a carbon content of 8()%.
その理由は、後述の内周面の焼入れの際の加熱および冷
却による割れを防止し、さらに肉厚中心部の焼入硬さを
可能な限り高めるためである。The reason for this is to prevent cracking due to heating and cooling during quenching of the inner circumferential surface, which will be described later, and to increase the quenching hardness of the thick central portion as much as possible.
つぎに第二工程では第一＝Ｉ程と同様に回転させ、＝
６−
かつ、外周面を水または水溶液冷却剤で冷しつつ、製品
を二１イルに対し移動させ、その内周面に高周波焼入を
施づ。ここ−Ｃ外周面を水冷する理由は、高周波焼入後
の外周面か後で述べる第三工程で１イられる焼戻し軟化
以上の軟化を起す様な焼戻を起′Ｃ５すいようにするた
めておる。この際、内周面からの加熱は内周浸炭層は勿
論のこと、内周浸炭層に隣接する素材の一部迄、変態点
以上の温度に加熱し、内周有効硬化層を形成すると共に
、外周有効硬化層と内周有効硬化層との間に、有効硬さ
以下の高度を有する焼戻し層を形成するのである。Next, in the second step, rotate in the same way as the first =I step, =
6- And, while cooling the outer circumferential surface with water or an aqueous coolant, move the product to the 21-il, and apply induction hardening to the inner circumferential surface. The reason for water-cooling the outer circumferential surface of C5 is to prevent the outer circumferential surface after induction hardening from undergoing tempering that is greater than the tempering softening that occurs in the third step described later. is. At this time, the heating from the inner circumference heats not only the inner circumference carburized layer but also a part of the material adjacent to the inner circumference carburized layer to a temperature above the transformation point, forming an inner circumference effective hardening layer. A tempered layer having a hardness lower than the effective hardness is formed between the outer effectively hardened layer and the inner effectively hardened layer.
りなわら、この内周面の焼入の結果外周表面部【コ、殆
ど焼入のままの硬度を維持するが、肉厚中心に移るに従
って、熱伝導による内面加熱の影響を受（プ、焼戻軟化
を生する。これによってブッシング索（Δの内外周面に
は、それぞれ、有効硬化層か浸炭層より深く形成される
とともに、これ等の有効硬化層の間には焼戻部か形成さ
れるのである。However, as a result of quenching the inner circumferential surface, the outer circumferential surface maintains almost the same hardness as quenched, but as it moves toward the center of the wall thickness, it becomes affected by internal heating due to heat conduction. As a result, on the inner and outer circumferential surfaces of the bushing cable (Δ), an effective hardened layer and a carburized layer are formed deeper than each other, and a tempered portion is formed between these effective hardened layers. It is.
そして、第三の工程−Ｃ上記ブッシング素材に低温焼戻
を施°りことによって履帯用ブッシングの熱処理は完成
する。Then, in the third step - C, the above-mentioned bushing material is subjected to low-temperature tempering, thereby completing the heat treatment of the track bushing.
１作 用」
上記履帯用ブッシングの製造方法は中程度の炭素を含む
鋼４Ａを使用しているから、肌焼鋼を使用するよりも浸
炭工程（Ｊ於いて浸炭時間が短い。更に、浸炭層を超え
て、焼入加熱か行なわれるため、ＪＪＳ ”ｉ′ｃ規定
する浸炭時の有効硬化層深さを得るのに充分な炭素量を
含む素材を予め使用し、焼入冷却が適当で必れば、全浸
炭深さは全部有効硬化深さになる。それに追加して、浸
炭層に隣接する素材の一部も、有効硬化深さの限界硬さ
以上となり、結果として、浸炭深さが増えたような現象
となり、耐摩性、強度の面子が期待てきる。また、肌焼
鋼より高炭素の索４Ａを使用しでいるのも拘わらず、急
速加熱を行っているの−Ｃ゛靭性か損われることはない
。1.The above manufacturing method for track bushings uses steel 4A containing moderate carbon content, so the carburizing time is shorter in the carburizing process (J) than when case hardening steel is used. Since quenching heating is performed beyond the quenching temperature, a material containing sufficient carbon content to obtain the effective hardened layer depth during carburizing specified by JJS ``i'c must be used in advance, and quenching cooling must be performed appropriately. Then, the total carburization depth becomes the effective case depth.In addition, some of the material adjacent to the carburized layer also has a hardness greater than the effective case depth limit, and as a result, the carburization depth becomes the effective case depth. This is a phenomenon that increases the wear resistance and strength.Also, despite using 4A cable, which has a higher carbon content than case-hardened steel, rapid heating is used to improve its -C toughness. It will not be damaged.
浸炭されたブッシングは一般には靭性を確保づるために
、浸炭後、−度△１変態点以下に下げてから、再加熱し
て焼入されるか、成るいは一時焼きを行い、二次焼入れ
をする方法かとられる。本方法は、高周波焼入を行うか
ら、前述の浸炭後の一般的に用いられる二つの焼入工程
に比ｌくで機械的性質の向−Ｆか期待できる。更に一般
的に用いられる焼入方法のうり前者は後者に比して経済
的効果は大きい。In order to ensure toughness, carburized bushings are generally carburized and then lowered to below the transformation point of -degree△1, then reheated and quenched, or temporarily quenched and then subjected to secondary quenching. A method to do this is considered. Since this method performs induction hardening, it can be expected that the mechanical properties will be improved to -F compared to the two commonly used quenching steps after carburizing. Furthermore, among the commonly used quenching methods, the former has a greater economic effect than the latter.
したかつて本方法の経済的効果を見る場合は、前者の方
法と比較−づれば良い。本方法の高周波焼入は前者の焼
入ＩＩＩ程との比較で必すしも安価とは言えない。しか
し浸炭時間の削減効果か大きく、全工程でみれば製造ロ
ス１へは安価となり経済的効果を生むものである。When looking at the economic effects of this method, it is best to compare it with the former method. The induction hardening method of this method is not necessarily cheaper than the former hardening III. However, the effect of reducing the carburizing time is significant, and if you look at the entire process, the manufacturing loss is reduced to 1, resulting in an economical effect.
［実施例］
以下に熱処理方法を、表１〜表３、および第３図・〜第
７図で説明する。[Example] The heat treatment method will be explained below with reference to Tables 1 to 3 and FIGS. 3 to 7.
第３図に示覆ように、ｌ ＝１５８ ｔｎｎｒ、 Ｄ１
＝Φ６６．８５ ＨｎＸ［）２ ＝Φ４４．８５ｍｍ、
θ−８０度、Ｒ−２、Ｋ＝２０である。この試験片を構
成する材質の化学成分は表′１の通りでおる。同表の数
値は単量％を示す。As shown in FIG. 3, l = 158 tnnr, D1
=Φ66.85 HnX[)2 =Φ44.85mm,
θ-80 degrees, R-2, K=20. The chemical composition of the material constituting this test piece is shown in Table 1. The numerical values in the same table indicate the percentage of monomer.
表−１供試伺の化学成分
そして、この鋼種から成る試験材の熱処理法を表２に示
す。Table 1 shows the chemical composition of the sample and the heat treatment method for the test material made of this steel type.
＝ １０−
表−２供試イＡの熱処理仕様
また、表２に示した高周波焼入の詳細な仕様は、表３に
示ず。= 10- Table 2 Heat treatment specifications for test A A The detailed specifications for induction hardening shown in Table 2 are not shown in Table 3.
表−３本方法の高周波焼入仕様
一ト記熱処理仕様に基づいて加工された浸炭深さと断面
硬さを示す。Table 3: Induction hardening specifications for this method - Shows the carburizing depth and cross-sectional hardness processed based on the heat treatment specifications.
第４図は、表２の浸炭方法により浸炭した際に、同時に
浸炭した板状の試験片を表面及び深さ方向に０１削した
それぞれの表面を、Ｘ線マイク１丁１アナライザーによ
り調査したものである。浸炭深度で有効な浸炭層を炭素
量を０．４％と仮定すればばは同等の深さになっている
。Figure 4 shows the surface of a plate-shaped test piece that was carburized using the carburizing method shown in Table 2, and the surfaces of the carburized plate specimens were milled by 01 in the surface and depth directions using one X-ray microphone and one analyzer. It is. Assuming that the effective carburized layer has a carbon content of 0.4%, the depth is equivalent to that of the carburized layer.
第５図は、浸炭複本発明方法の外周焼入後の断面硬さで
ある。外周表面は浸炭されているのでほぼ浸炭層の最高
硬度に達している。外表面から３〜６ ｍｔｎのところ
は浸炭されておらず、素４Δの炭素量のところである。FIG. 5 shows the cross-sectional hardness after outer periphery quenching using the carburizing method of the present invention. Since the outer peripheral surface is carburized, it almost reaches the maximum hardness of the carburized layer. The area 3 to 6 mtn from the outer surface is not carburized and has a carbon content of 4Δ.
索（Ａ硬さの最高値を示し−（−いる。この値か浸炭深
さ以上に有効硬さの深さを伸ばず要因となり得る。This value indicates the highest value of hardness. This value may be a factor in that the depth of effective hardness does not extend beyond the carburized depth.
表面から７〜８ ｍｎｔに最低硬さが有るか、この部分
も浸炭の影響のない部分てあり、索４Ａ硬ざの８０％マ
ルテンザイ１〜をもって焼入有効硬さと見做しているの
で、焼入硬ざどして満足し得る。９〜１１ｍｍは内周焼
入の際に焼割れを生じない範囲であり、特に問題はない
。The minimum hardness is 7 to 8 mnt from the surface, and this area is also not affected by carburizing, and 80% martenzain 1 or more of the cable 4A hardness is considered to be the effective hardness for quenching. You can be satisfied with your hard work. 9 to 11 mm is a range in which quench cracking does not occur during inner periphery quenching, and there is no particular problem.
第６図は、第５図に示した外周焼入したものを内周焼入
を行い、更に焼戻したものである。FIG. 6 shows the outer periphery hardened material shown in FIG. 5, which is then inner periphery quenched and further tempered.
ＪＩＳで規定する浸炭の有効硬化深さの１−１．＜。５
２．３（＋−１，５５０）のところで見ると、外周では
焼戻硬化層深さは２．８ｍｍでおり、内周では２．５ｍ
ｔｎである。1-1 of the effective hardening depth of carburization specified by JIS. <. 5
Looking at 2.3 (+-1,550), the depth of the tempered hardened layer is 2.8 mm on the outer periphery, and 2.5 m on the inner periphery.
It is tn.
第４図のＡＳＣＢ４０Ｈの浸炭深さは２．４＃Ｉ／１１
であり、内周では浸炭深さにほぼ等しいか、外周深さは
浸炭深さより明らかに深く硬化されている。浸炭深さと
焼戻硬化層深さの差の０．４ ｎｕｎは素材の素地か硬
化したものと見做しで良い。The carburizing depth of ASCB40H in Figure 4 is 2.4#I/11
The inner periphery is approximately equal to the carburized depth, or the outer periphery depth is clearly deeper than the carburized depth. The difference between the carburization depth and the temper hardening layer depth of 0.4 nun can be regarded as the base material or hardened material.
更に、その影響を明確にするために、前記ザンプルより
大型のブッシングを用いて調査を行った。Furthermore, in order to clarify the effect, an investigation was conducted using a bushing larger than the sample.
第３図に示す記号を持ってすれば、
Ｌ＝２１２ 、Ｄ１＝（１）８８．２、Ｄ２ ＝（＋）
５６．０、Ｋ＝１、θ−７５°、Ｒ−２
の大ぎさで、この試片を構成する化学成分は、表４の通
りである。同表の数値は重量％を示覆。Using the symbols shown in Figure 3, L=212, D1=(1)88.2, D2=(+)
56.0, K=1, θ-75°, R-2, and the chemical components constituting this specimen are as shown in Table 4. The figures in the same table represent weight percentages.
そして、この鋼種から成る試験材の熱処理方法を表５に
示す。Table 5 shows the heat treatment method for test materials made of this steel type.
また、表５に示した高周波焼入の詳細な仕様は表６に示
す。Further, detailed specifications of the induction hardening shown in Table 5 are shown in Table 6.
表−６本方法の高周波焼入仕様
この試片の全浸炭深さ、つまり０．４１％Ｃに達する迄
の表面からの深さは、Ｘ線ンイクロアナライザーに依れ
ば３．２ｍｍであった。Table 6: Induction hardening specifications for this method The total carburizing depth of this specimen, that is, the depth from the surface until it reaches 0.41%C, is 3.2 mm according to an X-ray microanalyzer. Ta.
第７図は、表−７に基づく熱処理を完了した後の断面硬
さである。FIG. 7 shows the cross-sectional hardness after completing the heat treatment based on Table 7.
これに依れば、月Ｓで規定している有効浸炭深さＨｙ
！］り０ （町ｃ５２．３＞の硬さの位置は外表面か
ら１１．２ｍｎ１、内表面から３．５ｍｍである。この
結果と、全浸炭深さとの差は外表面では１．０ｍｍ、内
表面“Ｃは０．３ｍｎ＋どなる。この値は、素地が硬化
したものと見做して良い。According to this, the effective carburizing depth Hy specified in Month S
! ] 0 (The hardness position of town c52.3> is 11.2 mmn1 from the outer surface and 3.5 mm from the inner surface.The difference between this result and the total carburization depth is 1.0 mm on the outer surface and 3.5 mm on the inner surface. The surface "C" is 0.3 mn+. This value can be considered to mean that the base material has been hardened.
従って本方法の特徴である浸炭層深さ以上の、見掛り上
の浸炭有効硬化層深さを獲得することになる。Therefore, it is possible to obtain an apparent effective carburized layer depth that is greater than the carburized layer depth, which is a feature of this method.
また、記述を前述の小型のブッシングに戻して、実施例
の説明を続ける。Further, the description returns to the above-mentioned small-sized bushing and the description of the embodiment is continued.
第８図は比較祠としてのＳＣＭ４２０の浸炭焼入後の断
面硬さである。ＨＲＣ５２，３（ＨＶ５５０）の位置の
深さが２．１＃である。第３図の０．４％Ｃの位置の浸
炭深さが２．２Ｍであり、はとんど等しい状態である。FIG. 8 shows the cross-sectional hardness of SCM420 as a comparison stone after carburizing and quenching. The depth at the position of HRC52,3 (HV550) is 2.1#. The carburizing depth at the 0.4%C position in FIG. 3 is 2.2M, and the carburization depth is almost the same.
このことは前述の有効な浸炭層の炭素量を０．４％とし
たことが、大略間違いない仮定であったと見做せる。This can be considered that the above-mentioned setting of the effective carbon content of the carburized layer as 0.4% was an almost correct assumption.
第９図は材質ＳＣＭ４２０を浸炭焼入れ焼戻したものと
、材質ＡＳＣ８４０Ｈを本方法で処理したものをとの５
ａＣｋＳ法で採取した残留応力の比較である。表面の圧
縮応力は本方法が大きいことが判る。Figure 9 shows the results of carburized, quenched and tempered material SCM420 and material ASC840H treated with this method.
This is a comparison of residual stresses collected using the aCkS method. It can be seen that the compressive stress on the surface is large in this method.
第１０図は衝撃試験片の採取位置、また、試験方法は第
１（）図ｅ９に示す通りである。すなわち同図中、１１
はブッシングを示し、試験片１２は、図示の位置から採
取する。また試験片１２は、長さＬ＝５５ｍｍ、Ｉ’ｌ
ｌ Ｈ＝＝ ５ ｔｎｎｒである。そしで、１３はハン
マーを示し、１４４Ｊ：支持台を示す。紛撃試験片１２
は本方法によるしのと従来の：しのとを問わず、表面に
芯部と異なる硬化層を持っでいるから切欠ぎを入れない
衝撃試験片とした。試験に際しての打撃方法は、ブッシ
ングでの使用時の打撃方向が外周面から内周面に向う方
向であるため、試験片１２は同図中（ｎのようにセラ１
へされる。また支持台１４はブッシング１１の内周面に
合せて円弧状に加工されている。FIG. 10 shows the collection position of the impact test piece, and the test method is as shown in FIG. 1() e9. In other words, in the same figure, 11
indicates the bushing, and the test piece 12 is taken from the location shown. Further, the test piece 12 has a length L=55 mm, I'l
lH==5tnnr. 13 indicates a hammer, and 144J indicates a support stand. Combat test piece 12
Regardless of whether the test piece was made using the present method or the conventional test piece, it was used as an impact test piece without notches because the surface had a hardened layer that was different from the core. The striking method for the test is that the striking direction when used with bushings is from the outer circumferential surface to the inner circumferential surface, so the test piece 12 was
be sent to Further, the support base 14 is processed into an arc shape to match the inner peripheral surface of the bushing 11.
以上の条件に基づいた試験結果を表−７に示す。Table 7 shows the test results based on the above conditions.
衝撃値に於いても１１１焼鋼の浸炭焼入れ焼戻し品に劣
らない。In terms of impact value, it is comparable to carburized, quenched and tempered 111 hardened steel.
第１１図は圧壊試験の方法を示している。圧壊試験は第
３図に示す−プ′ツシシングから１＝３０１Ｈ，に切断
した試験片１６を使用した。試験片１６の長さは試験機
の容量を考慮して決めたもので市って、技術的意味はな
い。１５．１７は試験機１８の押し治具を示す。またＢ
は荷重方向を示す。試験方法は７７ムスラ一引張試験機
に押し治具１５．１７をセットし、Ｂ方向に荷重を加え
て１９の位置に亀裂を生じさせるのである。そして亀裂
発生までの負荷のうち、最大荷重をもって圧壊荷重と定
め、その値を圧壊値と定義し、その時の試験片の撓みを
撓み値と定義した。FIG. 11 shows the method of crushing test. For the crushing test, a test piece 16 cut at 1=301H from the plastic shown in FIG. 3 was used. The length of the test piece 16 was determined by considering the capacity of the testing machine and has no technical meaning. 15.17 shows the pushing jig of the testing machine 18. Also B
indicates the load direction. The test method is to set the pushing jig 15.17 in a 77 Musura tensile tester, apply a load in the B direction, and create a crack at position 19. Of the loads up to crack initiation, the maximum load was defined as the crushing load, that value was defined as the crushing value, and the deflection of the test piece at that time was defined as the deflection value.
上記の方法で試験をした結果を表−８に示Ｊ。The results of the test using the above method are shown in Table 8.
表−８供試４７１別の圧壊と撓み
上記の結果からみる限り、これらの値も、肌焼鋼の浸炭
焼入焼戻品に本方法は劣らない。Table 8: Crushing and deflection of each sample 471 As far as we can see from the above results, these values are not inferior to those of carburized, quenched and tempered case hardened steel.
第１２図は疲労試験の方法を示している。ブッシングは
疲労試験機に装着された支持台の上に乗せて試験に供さ
れる。FIG. 12 shows the method of fatigue testing. The bushing is placed on a support stand attached to a fatigue testing machine and subjected to the test.
図示の内容を説明すると、２０はノ゛ツシングの支持台
、２１はブッシング、２２は押し治具、２３は亀裂発生
を検知するプローブを意味する。支持台のブッシング支
持部の半径Ｒ部分は、ブッシングの外周半径より０．１
５〜０．２ｍｍ大ぎく作っである。To explain the contents of the drawings, 20 is a support for the nodding, 21 is a bushing, 22 is a pushing jig, and 23 is a probe for detecting the occurrence of cracks. The radius R of the bushing support part of the support base is 0.1 from the outer circumferential radius of the bushing.
It is made to be 5 to 0.2 mm large.
また、図中Ｄ１は、ブッシングがリンクに嵌入した場合
の左右リンク間の距離にほぼ同じくして１００ｇとした
。Further, D1 in the figure was set to 100 g, which is approximately the same as the distance between the left and right links when the bushing is fitted into the links.
更に、押し治具の載荷重位置とプローブの取付位置Ｄ２
は、ブッシングに噛合うスプロケットの歯巾かブツシュ
面の全面に当ることがなく、歯巾の端かブッシングに局
部あたりする場合が最もブッシングに応力か集中する事
の配慮と、プローブをブッシングの内径に取りつける容
易さの限界を考慮して６０ｍｍと定めた。Furthermore, the loading position of the push jig and the mounting position D2 of the probe
The probe should not touch the tooth width of the sprocket that meshes with the bushing or the entire surface of the bushing, but rather the stress will be concentrated on the bushing when it hits the end of the tooth width or a local part of the bushing. The length was set at 60 mm, considering the limit of ease of installation.
＝ １９−
以上の様にセラ１〜した後、押し治具にＢ方向から繰返
し荷重をｈｎえた１、繰返し荷重は応力比Ｒ−０，０５
の片振荷重である。疲れ寿命の評価は載荷点直下の内周
表面の亀裂の発生を、亀裂発生を検知するプ１」−ブを
介して捕らえる。その際の荷重繰返し数を泪測した。= 19- After carrying out the process from 1 to 1 as described above, a repeated load was applied to the pushing jig from the B direction.
is the oscillating load. The fatigue life is evaluated by detecting the occurrence of cracks on the inner circumferential surface immediately below the loading point via a probe that detects the occurrence of cracks. The number of load repetitions at that time was measured.
以上の内容に基づいて試験した結果を、疲労試験のＳ−
Ｎ線図として第１３図に示して必る。この結果を見ても
＋１１１焼鋼の浸炭焼入焼戻したものと本方法の比較で
同等以上のものが得られている。The results of the tests based on the above contents are summarized as S-
It must be shown in FIG. 13 as an N diagram. Looking at the results, it can be seen that the results obtained by this method are equivalent to or better than those obtained by carburizing, quenching and tempering +111 hardened steel.
［発明の効果］
本発明によれば、同−有効硬化層深さを得るための浸炭
時間を削減でき、しかも強度、靭性の機械的性質が従来
法によるものと同等かそれ以上の履帯用フ゛ツシングか
ｊｑ−られる。[Effects of the Invention] According to the present invention, it is possible to reduce the carburizing time to obtain the same effective hardened layer depth, and to provide a fixing for tracks that has mechanical properties such as strength and toughness that are equal to or greater than those obtained by the conventional method. Or is it possible?
第１図は腹帯の組立図（７はブッシングである。
）、
第２図はブッシングの肌焼鋼の浸炭焼入れ品や、調質後
に表面を高周波焼入した場合のブッシング７の断面図、
第３図は試験に供したブッシングの各部寸法を表わす縦
断面図、
第４図は浸炭深さと炭素量の関係図、
第５図は本方法の外周高周波焼入を行ったときの断面焼
入れ硬さ、
第６図は本発明方法の第５図で示された焼入硬さのもの
に内周高周波焼入を行った際の焼入断面硬さと、それを
焼戻しだ場合の焼戻断面硬さ、第７図は第３図で表示さ
れ且つ本実施例の説明の主体を為すブッシングより大型
のブッシングで、浸炭焼入後、表−５に示す条件で処理
されたもので断面硬さ（この大型ブッシングに関する図
は、本図以外には、他の図の説明に関連はない。）、第
８図は前記ＳＣ旧２０の浸炭焼入れ焼戻をした後の焼戻
断面硬さ、
第９図は熱処理後の残菌応力を示す線図、第１（）図（
イ）（［１）は征ｊ撃試験用の試験片採取位置を示すブ
ッシングの正面面および側面図、（／階は試験片のレフ
１〜状態を示す側面図、
第１１図げ）は斤壊試験の要部正面図、■はげ）の側面
図、
第１２図は疲労試験片のセラ１〜方法と試験方法の概略
図で、げ）は正面図、（Ｊ功はげ）の側面図、第１３図
は疲労試験のＳ−Ｎ線図、
ておる。
７・・・・・・・・・・・・履帯用ブッシング７ａ・・
・・・・・・・内表面
７ｂ・・・・・・・・・外表面
７Ｃ・・・・・・・・・内周と外周の表面硬化層７ｄ・
・・・・・・・・芯部（浸炭の場合は非浸炭層、調質後
表面高周波焼入の場合は
調質層）
特 許 出 願 人 １〜ピーエ業株式会社代 理
人 弁理士 円側 経線
（他１名）
＝ ２２−
■トFigure 1 is an assembly diagram of the belt (7 is the bushing), Figure 2 is a cross-sectional view of the bushing 7 made of case-hardened steel, carburized and quenched, and the surface of which is induction hardened after tempering. Figure 3 is a vertical cross-sectional view showing the dimensions of each part of the bushing used in the test, Figure 4 is a diagram showing the relationship between carburization depth and carbon content, and Figure 5 is the cross-sectional quenching hardness when outer periphery induction hardening is performed using this method. , Fig. 6 shows the quenched cross-sectional hardness when internal periphery induction hardening is performed on a material having the quenching hardness shown in Fig. 5 of the method of the present invention, and the tempered cross-sectional hardness when it is tempered. , Fig. 7 shows a bushing larger than the bushing shown in Fig. 3 and which forms the main part of the explanation of this example, which was carburized and quenched and then treated under the conditions shown in Table 5. Figures related to large bushings are not related to the explanations of other figures other than this figure.) Figure 8 shows the tempered cross-sectional hardness of the SC old 20 after carburizing, quenching and tempering, Figure 9 is a diagram showing residual bacterial stress after heat treatment, Figure 1 () (
B) ([1] is a front and side view of the bushing showing the specimen collection position for the conquest test, (/floor is a side view showing the condition of the test specimen, Figure 11) is the Figure 12 is a schematic diagram of the method and test method for the fatigue test specimen, front view of the main part of the fatigue test, side view of (J-gold), Figure 13 is the S-N diagram of the fatigue test. 7...Crawler bushing 7a...
......Inner surface 7b...Outer surface 7C......Hardened surface layer 7d on inner and outer peripheries.
・・・・・・・・・Core part (non-carburized layer in case of carburizing, tempered layer in case of surface induction hardening after tempering) Patent Applicant 1 ~ Agent of PB Gyo Co., Ltd.
Person Patent attorney Circle side Meridian (1 other person) = 22- ■G
Claims (1)
炭を施した後、ブッシングの外周面及び肉厚内周面から
肉厚中心部に向って、それぞれ高周波焼入部を形成し、
浸炭層の厚さ以上に焼入層厚さを確保すると共に、芯部
に焼戻し部を形成したことを特徴とする履帯用ブッシン
グ。 ２、中程度の炭素を含む履帯用ブッシングに、予め浸炭
を施し、その軸線を中心にして回転させつつ、その外周
面に浸炭層を超えて高周波焼入を施し、該ブッシングの
内周面を、外周面焼入後の次工程である内周面からの焼
入の為の再加熱で焼割れを起さない程度迄に、焼入硬化
を留めると共に、該外周面から前記ブッシング材の内周
有効硬化層の一部に至る迄の範囲を有効硬さの硬度にす
る工程と、 ブッシング材をその軸線を中心にして回転させ、かつ、
前記外周面を液冷しつつ、その内周面に内周浸炭層を越
えて高周波焼入を施し、該ブッシングに外周有効硬化層
と前記内周有効硬化層とを形成すると共に、該有効硬化
層の間に、前記有効硬さ以下の硬度を有する焼戻し層を
形成する工程と、前記工程の終了後、前記ブッシングを
低温で焼戻しする工程と、 を有することを特徴とする履帯用ブッシングの製造方法
。[Scope of Claims] 1. After carburizing a bushing for a crawler track containing a medium amount of carbon, induction hardening is applied from the outer peripheral surface and thick inner peripheral surface of the bushing toward the center of the wall thickness. form,
A bushing for a track, characterized in that the thickness of the hardened layer is greater than the thickness of the carburized layer, and a tempered portion is formed in the core. 2. A track bushing containing a moderate amount of carbon is carburized in advance, and while rotating around its axis, induction hardening is applied to the outer circumferential surface beyond the carburized layer, and the inner circumferential surface of the bushing is , the quench hardening is stopped to the extent that quenching cracks do not occur during reheating for hardening from the inner circumferential surface, which is the next step after hardening the outer circumferential surface, and the inner circumferential surface of the bushing material is removed from the outer circumferential surface. a step of making the range up to a part of the circumferential effective hardening layer effective hardness, rotating the bushing material around its axis, and
While liquid cooling the outer circumferential surface, induction hardening is applied to the inner circumferential surface beyond the inner circumferential carburized layer to form an outer circumferential effective hardening layer and an inner circumferential effective hardening layer on the bushing, and the effective hardening. Manufacturing a bushing for a crawler track, comprising: forming a tempered layer having a hardness equal to or less than the effective hardness between the layers; and tempering the bushing at a low temperature after completing the step. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8733888A JPH01259129A (en) | 1988-04-11 | 1988-04-11 | Bushing for track containing carbon at about middle ratio and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8733888A JPH01259129A (en) | 1988-04-11 | 1988-04-11 | Bushing for track containing carbon at about middle ratio and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01259129A true JPH01259129A (en) | 1989-10-16 |
Family
ID=13912082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8733888A Pending JPH01259129A (en) | 1988-04-11 | 1988-04-11 | Bushing for track containing carbon at about middle ratio and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01259129A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375392A2 (en) * | 1988-12-21 | 1990-06-27 | Topy Kogyo Kabushiki Kaisha | Production method for a caterpillar band bushing |
| JPH0525546A (en) * | 1991-07-18 | 1993-02-02 | Nippon Steel Corp | Production of shaft-shaped machine parts having high torsional strength |
| FR2755980A1 (en) * | 1996-11-14 | 1998-05-22 | Girardello Bruno | Heat treatment process for bearings |
| CN102912087A (en) * | 2012-09-26 | 2013-02-06 | 王硕桂 | Process for quenching surface of 20 steel pipe without flexible overlap strip by plasma arc through carburizing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4899044A (en) * | 1972-03-30 | 1973-12-15 | ||
| JPS6316314A (en) * | 1986-07-08 | 1988-01-23 | Takamisawa Saibaneteitsukusu:Kk | Interface device for no-break power unit |
-
1988
- 1988-04-11 JP JP8733888A patent/JPH01259129A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4899044A (en) * | 1972-03-30 | 1973-12-15 | ||
| JPS6316314A (en) * | 1986-07-08 | 1988-01-23 | Takamisawa Saibaneteitsukusu:Kk | Interface device for no-break power unit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375392A2 (en) * | 1988-12-21 | 1990-06-27 | Topy Kogyo Kabushiki Kaisha | Production method for a caterpillar band bushing |
| US5032192A (en) * | 1988-12-21 | 1991-07-16 | Topy Kogyo Kabushiki Kaisha | Production method for a vehicular endless track bushing |
| JPH0525546A (en) * | 1991-07-18 | 1993-02-02 | Nippon Steel Corp | Production of shaft-shaped machine parts having high torsional strength |
| FR2755980A1 (en) * | 1996-11-14 | 1998-05-22 | Girardello Bruno | Heat treatment process for bearings |
| US6193820B1 (en) | 1996-11-14 | 2001-02-27 | Bruno Girardello | Method for the thermal treatment of bushings, particularly for tracked vehicles and the like |
| CN102912087A (en) * | 2012-09-26 | 2013-02-06 | 王硕桂 | Process for quenching surface of 20 steel pipe without flexible overlap strip by plasma arc through carburizing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9303297B2 (en) | Heat treatment method of pin for endless track | |
| EP0700739B1 (en) | Method for producing a vehicular endless track link | |
| KR19990068141A (en) | Method for heat-treating a hollow cylindrical workpiece | |
| JP2003342636A (en) | Crawler belt bushing and its manufacturing process | |
| JPH01259129A (en) | Bushing for track containing carbon at about middle ratio and production thereof | |
| KR930004474B1 (en) | Production method for a vehicular endless track bushing | |
| JP2001098326A (en) | Bushing for crawler belt and its producing method | |
| US5049207A (en) | Heat treatment process for bushing used in track of endless track tractor | |
| US6193820B1 (en) | Method for the thermal treatment of bushings, particularly for tracked vehicles and the like | |
| JP3351860B2 (en) | Crawler track bushing and method of manufacturing the same | |
| US20230304528A1 (en) | Crankshaft | |
| JPH03285020A (en) | Manufacture of bushing for crawler | |
| Prabhu et al. | Experimental Investigation Into Fatigue Behaviuor of EN-8 Steel (080M40/AISI 1040) Subjected to Heat Treatment and Shot Peening Processes | |
| JP2009138261A (en) | Heat-treatment method for columnar component | |
| JPH0578746A (en) | Manufacture of bushing for crawler | |
| JP3856536B2 (en) | Crawler belt bushing and manufacturing method thereof | |
| JP3114983B2 (en) | Crawler pin and method of manufacturing the same | |
| JPH03166320A (en) | Track bushing and its production | |
| JPS6316314B2 (en) | ||
| JP5424298B2 (en) | Heat treatment method for cylindrical parts | |
| CN105154630B (en) | A kind of high-voltage switch gear pipe valve preparation method and high-voltage switch gear pipe valve | |
| JPS63109119A (en) | Method for heat treatment of caterpillar bush | |
| JPH0772303B2 (en) | ▲ High ▼ Deep hardened bushing and its manufacturing method | |
| JPH0578745A (en) | Manufacture of bushing for crawler | |
| JP3856545B2 (en) | Heat treatment method for crawler belt bush |