JPH059488B2 - - Google Patents
Info
- Publication number
- JPH059488B2 JPH059488B2 JP17918683A JP17918683A JPH059488B2 JP H059488 B2 JPH059488 B2 JP H059488B2 JP 17918683 A JP17918683 A JP 17918683A JP 17918683 A JP17918683 A JP 17918683A JP H059488 B2 JPH059488 B2 JP H059488B2
- Authority
- JP
- Japan
- Prior art keywords
- quenching
- link
- crawler
- water
- track link
- 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.)
- Expired - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000010791 quenching Methods 0.000 claims description 14
- 230000000171 quenching effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000712 Boron steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-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
- C21D9/0087—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for chains, for chain links
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)
Description
【発明の詳細な説明】
本発明はブルドーザやパワーシヨベル等の履帯
リンクの焼入方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for hardening track links of bulldozers, power shovels, etc.
従来、履帯リンクは中炭素の低合金鋼をQT
（素材調質）により全体の強度、靭性を得、さら
に第１図乃至第５図に示すように履帯リンクａの
下面部Ａを高周波焼入を行い、耐摩耗性、疲労強
度を得るような熱処理が実施されていた。 Conventionally, track links are made of medium-carbon, low-alloy steel.
(Material refining) to obtain overall strength and toughness, and as shown in Figs. 1 to 5, the lower surface A of the track link a is induction hardened to obtain wear resistance and fatigue strength. Heat treatment was being carried out.
この場合、
(1) 高周波焼入により15mm以上の均一で正常な硬
化層を得るのは困難。 In this case: (1) It is difficult to obtain a uniform and normal hardened layer of 15 mm or more by induction hardening.
(2) 素材調質と高周波焼入の２回にわたる熱処理
プロセスであるため処理に必要なエネルギーコ
スト、工数が多い。(2) Since the heat treatment process involves two steps: material refining and induction hardening, the energy cost and man-hours required for the treatment are large.
などの問題点があつた。There were other problems.
本発明は上記の事情に鑑みなされたものであつ
て、その目的とするところは履帯リンクの下面部
の硬化深さが向上できて耐摩耗寿命、疲労強度を
大巾に改善することができるしまた熱処理工程が
一工程になり省エネルギー化が可能でしかも製造
原価が減少できる履帯リンクの焼入方法を提供す
ることにある。 The present invention was made in view of the above circumstances, and its purpose is to improve the hardening depth of the lower surface of the track link, thereby greatly improving the wear resistance life and fatigue strength. An object of the present invention is to provide a method for quenching a crawler link, which reduces the heat treatment process to one step, saves energy, and reduces manufacturing costs.
以下、本発明を第６図以下を参照して説明す
る。 Hereinafter, the present invention will be explained with reference to FIG. 6 and subsequent figures.
図面中１は焼入水槽であり、焼入水槽１内には
遮閉板２が設けてあり、この遮閉板により焼入水
槽１内は上側冷却部３と下側冷却部４とに区分さ
れている。遮閉板２には、履帯リンク５を載せた
場合、これの下面部６が下側冷却部４に突出でき
る孔状部７が形成してある。 1 in the drawing is a quenching water tank, and a shielding plate 2 is provided in the quenching water tank 1. The interior of the quenching water tank 1 is divided into an upper cooling section 3 and a lower cooling section 4 by this shielding plate. has been done. A hole-like portion 7 is formed in the shielding plate 2 so that a lower surface portion 6 of the crawler track link 5 can protrude into the lower cooling portion 4 when the crawler link 5 is placed thereon.
上側冷却部３には複数上側ノズル８と左右側ノ
ズル９，１０とが配置してあり、下側冷却部４に
は下側ノズル１１が配置してある。 A plurality of upper nozzles 8 and right and left nozzles 9, 10 are arranged in the upper cooling part 3, and a lower nozzle 11 is arranged in the lower cooling part 4.
水ポンプ１２の吐出側は配管１３，１４，１
５，１６を介して上、下、左、右側ノズル８，１
１，９，１０に接続してあり、配管１３，１４お
よび配管１５，１６の合流部１７にバルブ１８，
１９，２０が設けてあり、水ポンプ１２の吸込側
は管路２８を介して焼入水槽１の底に接続してあ
る。左、右側ノズル９，１０の下方で遮閉板２上
には空気ノズル２１，２２が配置してあり、空気
コンプレツサ２３の吐出側には空気配管２４，２
５を介して空気ノズル２１，２２に接続してあ
り、空気配管２４，２５の合流部２６にバルブ２
７が設けてある。 The discharge side of the water pump 12 is pipes 13, 14, 1
5, 16 through upper, lower, left, right nozzles 8, 1
1, 9, and 10, and a valve 18,
19 and 20 are provided, and the suction side of the water pump 12 is connected to the bottom of the quenching water tank 1 via a conduit 28. Air nozzles 21 and 22 are arranged on the shielding plate 2 below the left and right nozzles 9 and 10, and air pipes 24 and 2 are arranged on the discharge side of the air compressor 23.
The valve 2 is connected to the air nozzles 21 and 22 through the air pipes 24 and 25, and the valve 2 is connected to the confluence part 26 of the air pipes 24 and 25.
7 is provided.
しかして履帯リンク５の下面部Ａを下側ノズル
１１より噴射される冷却水により、また下面部Ａ
を除く上部分Ｂを上側ノズル８、左、右側ノズル
９，１０より噴射される冷却水により焼入を行
う。遮閉板２は上、下側冷却部３，４間で水が移
動するのを防ぐ。 As a result, the lower surface portion A of the crawler track link 5 is cooled by the cooling water sprayed from the lower nozzle 11.
The upper portion B, excluding the upper portion B, is hardened with cooling water injected from the upper nozzle 8 and the left and right nozzles 9 and 10. The shielding plate 2 prevents water from moving between the upper and lower cooling sections 3 and 4.
履帯リンク５の下面部Ａと上部Ｂの冷却のねら
い条件は第８図に示すようになり、両部のそれぞ
れの冷却は同時進行にて行なわれ、かつそれぞれ
の冷却に度合は冷却水の量で制御される。 The target conditions for cooling the lower surface part A and the upper part B of the track link 5 are as shown in FIG. controlled by
水スプレー圧は0.5〜８Kg／cm2であり、空気ノ
ズル圧力は0.5〜５Kg／cm2である。 The water spray pressure is 0.5-8Kg/ cm2 , and the air nozzle pressure is 0.5-5Kg/ cm2 .
空気の噴射は遮閉板２上の水を吹きとばすのに
用いられる。 The air jet is used to blow away the water on the shielding plate 2.
このようにして焼入れを行うと履帯リンク５の
下面部Ａはマルテンサイト組織を、上部Ｂはベイ
ナイト組織を得る。 When hardening is performed in this manner, the lower surface portion A of the crawler link 5 has a martensitic structure, and the upper surface portion B thereof has a bainite structure.
供試鋼材は、炭素鋼あるいは低マンガン鋼、ボ
ロン鋼、低クロム鋼・モリブデン鋼、バナジウム
鋼などが使用できるが、これらの鋼種を選ぶ場合
履帯リンクの寸法、肉厚により決められる。すな
わち、寸法、肉厚が大きくなるほど、より焼入性
の良い材料を使わなければならない。 The steel materials that can be used include carbon steel, low manganese steel, boron steel, low chromium steel/molybdenum steel, and vanadium steel, but the selection of these steel types is determined by the dimensions and wall thickness of the track link. In other words, the larger the dimensions and wall thickness, the better the hardenability of the material must be used.
上記した焼入の結果、履帯リンク５の下面部Ａ
は15mm以上の硬化層Ｃが得られる。第９図の試作
品の硬化深さ測定側では25〜27mmの硬化層が得ら
れた。第１０図に硬度と硬化深さを示す。実線の
曲線が本発明方法によつて焼入された履帯リンク
５の下面部Ａのものであり、斜線部分は高周波焼
入による履帯リンク５の下面部Ａのものである。 As a result of the hardening described above, the lower surface part A of the crawler link 5
A hardened layer C of 15 mm or more can be obtained. On the hardening depth measurement side of the prototype shown in Figure 9, a hardened layer of 25 to 27 mm was obtained. Figure 10 shows the hardness and hardening depth. The solid curve represents the lower surface portion A of the crawler link 5 hardened by the method of the present invention, and the diagonal line portion represents the lower surface portion A of the crawler link 5 hardened by induction hardening.
また、第１１図に履帯リンク５の下部Ｂの硬度
と衝撃値を示す。この下部Ｂの衝撃値は従来法の
ものよりやゝ低い３〜４Kgfm／cm2であるが硬度
は46〜50HRCと高くより強靭である。 Further, FIG. 11 shows the hardness and impact value of the lower part B of the crawler link 5. The impact value of this lower part B is 3 to 4 Kgfm/cm 2 , which is slightly lower than that of the conventional method, but the hardness is high and tougher, at 46 to 50 HRC.
ちなみに従来法の焼入方焼房法では硬度32〜
37、シヤルビー衝撃値4.5〜5.5Kgfm／cm2である。 By the way, the hardness of the conventional hardening method is 32 ~
37, Sialby impact value 4.5-5.5Kgfm/ cm2 .
なお上記本発明の実施例における遮閉板２は履
帯リンク５と上、下の冷却部のそれぞれの水ノズ
ルとの間の距離や水噴射部位の位置決めの機能を
有している。またこの遮閉板２にて上下のノズル
からの噴射水の干渉が極力避けられる。 The shielding plate 2 in the embodiment of the present invention has the function of determining the distance between the crawler track link 5 and the respective water nozzles of the upper and lower cooling sections and positioning the water injection portion. In addition, this shielding plate 2 prevents interference of jet water from the upper and lower nozzles as much as possible.
本発明は以上詳述したように、焼入れ水槽１内
で履帯リンク５の下面部Ａと上部Ｂの間を遮閉板
２にて遮閉し、上記下面部Ａと上部Ｂとを別々
に、かつ同時進行にて水スプレー焼入れし、冷却
水量、焼入温度及び焼入時間の制御により下面部
Ａをマルテンサイト組織に、上部Ｂをベイナイト
組織に処理するようにしたことを特徴とする履帯
リンクの焼入方法である。 As described in detail above, the present invention uses a shielding plate 2 to close between the lower surface part A and the upper part B of the crawler track link 5 in the quenching water tank 1, and separates the lower surface part A and the upper part B. A crawler link characterized in that water spray quenching is carried out at the same time, and by controlling the amount of cooling water, quenching temperature and quenching time, the lower surface part A has a martensitic structure and the upper part B has a bainitic structure. This is the quenching method.
したがつて、履帯リンク５の下面部Ａの硬化深
さが向上できて耐摩耗寿命、疲労強度を大巾に改
善することができるし、また熱処理工程が一工程
になり省エネルギー化が可能でしかも製造原価が
減少できる。 Therefore, the hardening depth of the lower surface part A of the crawler link 5 can be improved, and the wear resistance life and fatigue strength can be greatly improved, and the heat treatment process is reduced to one step, which enables energy saving. Manufacturing costs can be reduced.
第１図は履帯リンクの平面図、第２図は同側面
図、第３図は第２図−，−，−線に
沿う断面図、第４図は第２図−線に沿う断面
図、第５図は５ｒ５線に沿う断面図、第６図は本
発明方法に用いる水スプレー冷却装置の構成説明
図、第７図は本発明による履帯リンクの焼入説明
図、第８図は本発明方法の焼入条件の説明図、第
９図は試作品の硬化深さ測定の説明図、第１０図
は同グラフ図、第１１図は履帯リンクの上部Ｂの
硬度と衝撃値のグラフ図である。
５は履帯リンク、Ａは下面部、Ｂは上部。
Fig. 1 is a plan view of the track link, Fig. 2 is a side view of the same, Fig. 3 is a sectional view taken along lines -, -, - in Fig. 2, and Fig. 4 is a sectional view taken along lines - - in Fig. 2. Fig. 5 is a sectional view taken along line 5r5, Fig. 6 is an explanatory diagram of the configuration of a water spray cooling device used in the method of the present invention, Fig. 7 is an explanatory diagram of quenching of the track link according to the present invention, and Fig. 8 is an explanatory diagram of the structure of the water spray cooling device used in the method of the present invention. An explanatory diagram of the hardening conditions of the method, Figure 9 is an explanatory diagram of the hardening depth measurement of the prototype, Figure 10 is a graph of the same, and Figure 11 is a graph of the hardness and impact value of the upper part B of the crawler link. be. 5 is the track link, A is the bottom part, and B is the top part.
Claims (1)
上部Ｂの間を遮閉板２にて遮閉し、上記下面部Ａ
と上部Ｂとを別々に、かつ同時進行にて水スプレ
ー焼入れし、冷却水量、焼入温度及び焼入時間の
制御により下面部Ａをマルテンサイト組織に、上
部Ｂをベイナイト組織に処理するようにしたこと
を特徴とする履帯リンクの焼入方法。1 In the quenching water tank 1, the space between the lower surface part A and the upper part B of the crawler track link 5 is closed off with the shielding plate 2, and the lower surface part A
and the upper part B are water spray quenched separately and simultaneously, and by controlling the amount of cooling water, quenching temperature, and quenching time, the lower part A is made into a martensitic structure and the upper part B is made into a bainitic structure. A track link hardening method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17918683A JPS6075514A (en) | 1983-09-29 | 1983-09-29 | Method for quenching caterpillar link |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17918683A JPS6075514A (en) | 1983-09-29 | 1983-09-29 | Method for quenching caterpillar link |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6075514A JPS6075514A (en) | 1985-04-27 |
| JPH059488B2 true JPH059488B2 (en) | 1993-02-05 |
Family
ID=16061438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17918683A Granted JPS6075514A (en) | 1983-09-29 | 1983-09-29 | Method for quenching caterpillar link |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6075514A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007108486A1 (en) * | 2006-03-22 | 2007-09-27 | Komatsu Ltd. | Crawler track link and method for manufacturing the same |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2517857B2 (en) * | 1991-09-18 | 1996-07-24 | 工業技術院長 | Manufacturing method of austempered ductile cast iron |
| JP4043298B2 (en) | 2002-06-14 | 2008-02-06 | 株式会社小松製作所 | Track link manufacturing method and track link manufactured by the manufacturing method |
| JP4131714B2 (en) * | 2004-05-17 | 2008-08-13 | トピー工業株式会社 | Method and apparatus for partial heat treatment of heat treatment member |
| JP4131715B2 (en) * | 2004-05-18 | 2008-08-13 | トピー工業株式会社 | Method and apparatus for partial heat treatment of heat treatment member |
| JP4817898B2 (en) * | 2006-03-14 | 2011-11-16 | トピー工業株式会社 | Heat treatment apparatus and heat treatment method |
| US9290217B2 (en) * | 2013-07-02 | 2016-03-22 | Caterpillar Inc. | Variable hardening depth in track link for a ground-engaging track |
| US9440693B2 (en) | 2014-03-20 | 2016-09-13 | Caterpillar Inc. | Air-hardenable bainitic steel part |
-
1983
- 1983-09-29 JP JP17918683A patent/JPS6075514A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007108486A1 (en) * | 2006-03-22 | 2007-09-27 | Komatsu Ltd. | Crawler track link and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6075514A (en) | 1985-04-27 |
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