JPH02122061A - Carburizing-hardened metallic material - Google Patents
Carburizing-hardened metallic materialInfo
- Publication number
- JPH02122061A JPH02122061A JP27393388A JP27393388A JPH02122061A JP H02122061 A JPH02122061 A JP H02122061A JP 27393388 A JP27393388 A JP 27393388A JP 27393388 A JP27393388 A JP 27393388A JP H02122061 A JPH02122061 A JP H02122061A
- Authority
- JP
- Japan
- Prior art keywords
- metallic material
- carburizing
- wear resistance
- carbon concentration
- surface hardness
- 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
- 239000007769 metal material Substances 0.000 title claims abstract description 16
- 238000005255 carburizing Methods 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 244000025254 Cannabis sativa Species 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、浸炭焼入れを施した金属材料に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a metal material subjected to carburizing and quenching.
浸炭焼入れの例として、第３図にインバク１−レンチの
一部断面図を示し、第４図にインパクトレンチのアンビ
ル２を示す。インパクトレンチは電動機又は圧縮空気等
により回転衝撃鄭動されるハンマー１を介し、アンビル
２及びソケッ１〜３を駆動させポル１〜又はナツト等を
締める機構のものである。これら公知のアンビル２及び
ソケッ）−３は第４図に示すように、その１萩合部は四
角形で互いにピン穴５．６を有し、ピン４により両者を
結合している。このためアンビル２はピン４との接触に
よる摩擦は避けられず、使用時間の経過と共に角部及び
ピン穴５．６の摩耗が進行し、肉厚の減少による応力増
大により早期破損を生じていた。As an example of carburizing and quenching, FIG. 3 shows a partial sectional view of an impact wrench, and FIG. 4 shows an anvil 2 of an impact wrench. The impact wrench is of a mechanism that drives an anvil 2 and sockets 1 to 3 through a hammer 1 that is driven by a rotary impact force such as an electric motor or compressed air, thereby tightening a bolt 1 to a nut or the like. As shown in FIG. 4, each of these known anvils 2 and sockets 3 has a rectangular joint and has a pin hole 5.6, and a pin 4 connects the two. Therefore, friction due to contact with the pin 4 was unavoidable in the anvil 2, and as the usage time progressed, the corners and the pin hole 5.6 began to wear, causing early breakage due to increased stress due to the decrease in wall thickness. .
アンビル２は通常浸炭焼入れを施しているが、これまで
のものでは十分な強度が得られなかった。The anvil 2 is usually carburized and quenched, but the conventional anvils did not have sufficient strength.
これは、浸炭焼入れの条件が、硬化Ｍ深さ、表面炭素濃
度、表面硬さ等多くの要因からなり、これら要因が相互
に影響し合っているため、最適条件を設定することが非
常に困難であることによるものである。This is because carburizing and quenching conditions are made up of many factors such as hardening M depth, surface carbon concentration, and surface hardness, and these factors interact with each other, making it extremely difficult to set the optimal conditions. This is due to the fact that
本発明の目的は、上記した従来技術の欠点をなくすため
、浸炭焼入れの最も有効な条件を設定するこ−とにより
、耐摩耗性及び高強度を付与し、浸である。The object of the present invention is to provide wear resistance and high strength by setting the most effective conditions for carburizing and quenching, in order to eliminate the drawbacks of the prior art described above.
本発明は、浸炭焼入れを金属材料に施すことにより耐摩
耗性及び高強度を付与できる点に着目し、浸炭焼入れの
条件を最良にするようにしたものである。The present invention focuses on the fact that wear resistance and high strength can be imparted to metal materials by carburizing and quenching, and optimizes the carburizing and quenching conditions.
通常、インパクトレンチのアンビルは、浸炭焼入れ処理
により寿命向上を図っているが、この浸炭焼入れは耐摩
耗性のほかに耐疲労性及び静的強度を十分考慮して最も
適正な硬度・硬化層深さ及び金相学的組織を与える条件
で処理することが不可欠である。しかし、これらの適正
な条件を定めるには処理温度・硬化層深さ・表面炭素濃
度と表面硬さ等の要因が相互に影響し合っているため最
適な処理条件を設定することが非常に困難で、惟に浸炭
焼入れ処理してもその特性が得られない。Normally, impact wrench anvils are carburized and quenched to extend their lifespan, but this carburizing process takes into account not only wear resistance but also fatigue resistance and static strength to achieve the most appropriate hardness and hardened layer depth. It is essential that the treatment be carried out under conditions that give a clear and metallographic structure. However, it is extremely difficult to set the optimal processing conditions because factors such as processing temperature, hardened layer depth, surface carbon concentration, and surface hardness interact with each other to determine these appropriate conditions. However, even if the carburizing and quenching treatment is applied to the material, the characteristics cannot be obtained.
そこで種々研究を行い、アンビルの強度を飛范的に向上
させるための条件を見い出した。その条件とは、全硬化
１（ＩＪ深さを肉厚の１０〜２０％とし、処理部の表面
炭素濃度を０．５〜０．７％として表面硬さをＨｖ ６
００〜８００とすることである。ここで全硬化層深さを
肉厚の１０〜２０％としたのは、全硬化層深さが１０％
以下では硬化層が浅く疲れ強度が不十分であり、２０％
以上にしても得られる特性は同じであるためである。次
に処理部の表面炭素濃度を０．５〜０．７％、又表面硬
さをＨｖ ６００〜８００としたのは１表面炭素濃度が
０．５％以下では表面硬さがＨｖ ６００以下となり、
十分な耐摩耗性及び耐疲労性が得られないためであり、
炭素濃度が０．７％以上では表層部に炭化物が生成し負
荷荷重に対する切欠き感受性が増加すること、またＨｖ
８００以上では疲労強度が著しく低下するためである。Therefore, we conducted various studies and found the conditions to dramatically improve the strength of the anvil. The conditions are full hardening 1 (IJ depth is 10 to 20% of the wall thickness, surface carbon concentration of the treated part is 0.5 to 0.7%, and surface hardness is Hv 6).
00 to 800. Here, the total hardened layer depth is set to 10 to 20% of the wall thickness because the total hardened layer depth is 10%.
Below 20%, the hardened layer is shallow and the fatigue strength is insufficient.
This is because the characteristics obtained are the same even if the above methods are used. Next, the surface carbon concentration of the treated part was set to 0.5 to 0.7%, and the surface hardness was set to Hv 600 to 800. 1 If the surface carbon concentration was 0.5% or less, the surface hardness would be Hv 600 or less. ,
This is because sufficient wear resistance and fatigue resistance cannot be obtained.
If the carbon concentration is 0.7% or more, carbides will form on the surface layer, increasing notch sensitivity to applied loads, and Hv
This is because fatigue strength is significantly lowered when it is 800 or more.
以上の条件を満たした本発明品と従来品との比較試験の
結果を第１図及び第２図に示す。第１図は引張り及び疲
労試験結果であり第２図は実際にアンビルをインパクト
レンチに取り付けてボルト締付を行う苛酷試験結果であ
る。ここで比較のために用いた従来品は、全硬化層深さ
が肉厚の２６％、処理部の表面炭素濃度が０．９〜１．
０％、表面硬さがＨｖ ９００のものでＪＩＳ規格ＳＮ
ＣＭ６３０による材質である。又本発明品もＪＩＳ規格
ＳＮＣＭ６３０による材質を使用し、前述の本発明の各
条件を満たしているものである。第１図の引張強さ及び
疲れ強さの試験結果によると、従来品と比較して本発明
品は引張強さ１．４倍以上疲れ強さ１．５倍以上の性能
を有していることがわかる。第２図の苛酷試験結果によ
ると、従来品と比較して２．４〜３．０倍の寿命を有し
ていることがわかる。The results of a comparative test between a product of the present invention and a conventional product that met the above conditions are shown in FIGS. 1 and 2. Figure 1 shows the results of tensile and fatigue tests, and Figure 2 shows the results of a severe test in which the anvil was actually attached to an impact wrench and bolts were tightened. The conventional product used for comparison here has a total hardened layer depth of 26% of the wall thickness and a surface carbon concentration of 0.9 to 1.
0%, surface hardness is Hv 900, JIS standard SN
The material is CM630. The product of the present invention also uses a material according to JIS standard SNCM630, and satisfies each of the above-mentioned conditions of the present invention. According to the test results of tensile strength and fatigue strength shown in Figure 1, the product of the present invention has tensile strength 1.4 times higher and fatigue strength 1.5 times higher than the conventional product. I understand that. According to the severe test results shown in FIG. 2, it can be seen that the life span is 2.4 to 3.0 times longer than that of conventional products.
本発明はインパクトレンチのアンビルに限られるもので
はなく、例えばハンマドリルの工具板は止めのために用
いられるリテーナ等、浸炭焼入れを施す金属材料全般に
使用可能なものである。The present invention is not limited to the anvil of an impact wrench, but can be used for general metal materials to be carburized and hardened, such as a retainer used for stopping a tool plate of a hammer drill.
本発明によれば、浸炭焼入れの表面炭素濃度。 According to the present invention, the surface carbon concentration of carburizing and quenching.
全硬化層深さ、表面硬さを最良な条件を設定したので、
金属材料に耐摩耗性及び高強度を付与することが出来、
金属材料の寿命を向上することができる。Since we have set the best conditions for the total hardened layer depth and surface hardness,
Able to impart wear resistance and high strength to metal materials,
The lifespan of metal materials can be improved.
第１図は本発明になる金属材料の引張り強さ及び疲れ強
さを示す試験結果の比較図、第２図は本発明をインパク
トレンチのアンビルに使用した場合の苛酷試験結果の比
較図、第３図はインパクトレンチの一部断面図、第４図
はインパクトレンチのアンビルとソケットの嵌合前の状
態図である。
１はハンマ、２はアンビル、３はソケット、４はピン、
５．６はピン穴である。
特許出願人の名称 日立工機株式会社
！−１ひ〕ダ１引ｋｌＩ 及プ゛メ彰労訊配に季ち泉夢
２図苛＠試験綽果
茅
弄４図Figure 1 is a comparison diagram of test results showing the tensile strength and fatigue strength of the metal material of the present invention, Figure 2 is a comparison diagram of severe test results when the present invention is used for an anvil of an impact wrench, FIG. 3 is a partial sectional view of the impact wrench, and FIG. 4 is a state diagram of the impact wrench before the anvil and socket are fitted. 1 is a hammer, 2 is an anvil, 3 is a socket, 4 is a pin,
5.6 is a pin hole. Patent applicant name Hitachi Koki Co., Ltd.! -1 h〕da 1 draw klI and the first award and labor transfer, Kichi Izumi dream 2 figure torture @ exam fruit grass play 4 figure
Claims (1)
属材料において、処理部の表面炭素濃度を０．５〜０．
７％とし、且つ表面硬さをＨｖ６００〜８００とするこ
とを特徴とする浸炭焼入れを施した金属材料。 ２、全硬化層深さを肉厚の１０〜２０％とした特許請求
の範囲第１項記載の浸炭焼入れを施した金属材料。[Claims] 1. In a metal material imparted with wear resistance and high strength by carburizing and quenching, the surface carbon concentration of the treated part is set to 0.5 to 0.
7% and a surface hardness of Hv600 to Hv800. 2. The carburized and quenched metal material according to claim 1, wherein the total hardened layer depth is 10 to 20% of the wall thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27393388A JPH02122061A (en) | 1988-10-28 | 1988-10-28 | Carburizing-hardened metallic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27393388A JPH02122061A (en) | 1988-10-28 | 1988-10-28 | Carburizing-hardened metallic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02122061A true JPH02122061A (en) | 1990-05-09 |
Family
ID=17534596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27393388A Pending JPH02122061A (en) | 1988-10-28 | 1988-10-28 | Carburizing-hardened metallic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02122061A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5431976A (en) * | 1977-08-13 | 1979-03-09 | Norichika Tanaka | Multiistage vertical incinerator |
| JPS572522A (en) * | 1980-06-05 | 1982-01-07 | Dainippon Printing Co Ltd | Defect inspecting device for regular pattern |
-
1988
- 1988-10-28 JP JP27393388A patent/JPH02122061A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5431976A (en) * | 1977-08-13 | 1979-03-09 | Norichika Tanaka | Multiistage vertical incinerator |
| JPS572522A (en) * | 1980-06-05 | 1982-01-07 | Dainippon Printing Co Ltd | Defect inspecting device for regular pattern |
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