JPS5970724A - Rolled hot-forged thread - Google Patents
Rolled hot-forged threadInfo
- Publication number
- JPS5970724A JPS5970724A JP18063182A JP18063182A JPS5970724A JP S5970724 A JPS5970724 A JP S5970724A JP 18063182 A JP18063182 A JP 18063182A JP 18063182 A JP18063182 A JP 18063182A JP S5970724 A JPS5970724 A JP S5970724A
- Authority
- JP
- Japan
- Prior art keywords
- forged
- thread
- carbon
- rolled hot
- carbon steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
Abstract
Description
【発明の詳細な説明】 本発明は、転鍛造ネジに関するものである。[Detailed description of the invention] The present invention relates to a rolled forged screw.
先ず、一般的に行なわれている転鍛造ネジの加工方法に
ついて図１〜６を参照して説明する。First, a commonly used method for processing a rolling forged screw will be described with reference to FIGS. 1 to 6.
第１図は、原料の切断工程の外観図でるり、ワイヤー状
の原線１は、１対のローラー２の回転力によってダイ３
の度当ｆｃＤｘで供給され、所定の長でにカッター４に
よって切断てれる。所定の長さに切られた原料を喰わえ
たダイ３は、次のステージに移動し、ダイ３より突き出
た原料がバンチ５によって押しつぶされ、ネジ頭部形状
に成形される。（第２図） これ迄の工程を鍛造加工と
呼ぶ、第３図は、鍛造品６の首下部にネジを切る転造工
程の外貌図でめる。平板の側面に斜めに刃を付けた。１
対のローリングカッター機７の間に、鍛造加工品乙の首
下部ヲはさみ、ローリングカッター８１７を押しつけな
がらスライドさせる事に工工って、首下部にネジ山を成
形させる。この工程を転造加工と呼ぶ１以上のように鍛
造工程、転造工程ともに強塑性加工でめる為、従来は原
線材料に炭素量を抑えた低炭素鋼材（Ｃ＝［］、２２％
以下を用い、転鍛造加工後に浸炭等による表面硬化処理
を行なっていた。FIG. 1 is an external view of the raw material cutting process. A wire-like raw wire 1 is cut into a die by the rotational force of a pair of rollers 2.
It is supplied at a rate of fcDx and cut by the cutter 4 to a predetermined length. The die 3 that has eaten the raw material cut to a predetermined length moves to the next stage, and the raw material protruding from the die 3 is crushed by the bunch 5 and formed into the shape of a screw head. (Fig. 2) The process up to this point is called forging. Fig. 3 is an external view of the rolling process in which a thread is cut in the lower part of the neck of the forged product 6. A blade was attached diagonally to the side of the flat plate. 1
The lower part of the neck of the forged product B is sandwiched between the pair of rolling cutter machines 7, and the rolling cutter 817 is pressed and slid to form a thread in the lower part of the neck. This process is called rolling processing.As mentioned above, both the forging process and the rolling process are performed by strong plastic processing, so conventionally the raw wire material is made of low carbon steel with a reduced carbon content (C = [ ], 22%
The following was used to perform surface hardening treatment such as carburizing after rolling forging.
しかしながら、表面硬化処理で得られる強度には限度が
めシ、腕時計用のネジの様に、ネジ径が細く、なおかつ
高強度を粉末されるものには適用出来なかった。However, there is a limit to the strength that can be obtained by surface hardening treatment, and it cannot be applied to screws with small diameters such as screws for wristwatches, which are powdered and have high strength.
本発明は、上述欠点を除去する為になされたものでメジ
、転鍛造ネジの腕時計への適用拡大を目的としたもので
ある。The present invention has been made to eliminate the above-mentioned drawbacks, and is aimed at expanding the application of square and rolled forged screws to wristwatches.
以下に本発明の詳細な説明する。転鍛造ネジに十分な強
度を持たせるには、抜刀ロエ材料は、塑性加工性と、適
度な強度、もしくは焼入硬化能を備えたものでなければ
ならない、ネジの必安強夏はその使用される環境条件に
よって異なるが、嵐時社用のネジ強度は、これ迄の経験
値より、炭素鋼ネジの場合、硬さでＨｖ ５５０以上が
心安とされている。第４図は、炭素鋼の炭素量と焼入硬
さの関係を求めた実験値で必る、焼入温度は、状態図工
りＡ３点を求めて加熱した。この結果をもとに、心安硬
度（焼戻硬さでＨｖ ５５０以上）の点から被加工材料
の炭素量の下限値は０．４％とした。０．４％以下では
所定の硬度が得られないだけでなく、硬化能のバラツキ
も大きく、品質的に不安定になる。The present invention will be explained in detail below. In order to provide sufficient strength to rolled and forged screws, the raw material must have plastic workability, appropriate strength, or quench hardening ability, and its use is essential for screws. Although it varies depending on the environmental conditions in which it is used, based on past experience, it is safe to have a hardness of Hv 550 or higher for carbon steel screws. FIG. 4 shows experimental values for determining the relationship between the carbon content and quenching hardness of carbon steel.The quenching temperature was determined at point A3 in the state diagram and heated. Based on this result, the lower limit of the carbon content of the workpiece material was set at 0.4% from the viewpoint of safe hardness (tempering hardness of Hv 550 or more). If it is less than 0.4%, not only will it not be possible to obtain the desired hardness, but there will also be large variations in hardenability, resulting in unstable quality.
第５図は塑性加工性の評価として１円柱状の試片を圧縮
力でつぶし、外周部に割れが生じた時の厚みと、尤の厚
みとの比率を、炭素含有型別に求めた実験結果である。Figure 5 shows the experimental results for evaluating plastic workability by crushing a cylindrical specimen with compressive force and determining the ratio of the thickness when a crack occurs on the outer periphery to the actual thickness for each carbon-containing type. It is.
その結果、０．７％以上から、急赦に硬化能が現われる
事が分かつ７’Ｃ，父、ローリングの仕上り肌も、０．
７％以上のものは粗びが激しい為、炭素量の上限値は０
．６％とした。As a result, it was found that hardening ability appears in sudden release from 0.7% or more.
Anything over 7% is extremely rough, so the upper limit for carbon content is 0.
．． It was set at 6%.
以上のごとく１本発明によれば、炭素含有童全α４〜０
．６％に制限する事により、塑性加工後、焼入硬化処理
にニジ、ネジ母材自体の強度アップが図れる為、腕時社
用のネジの様な、ネジ径が細く尚強度を安水される様な
ものへも、転鍛造ネジの適用が可能となった。As described above, according to the present invention, carbon-containing dozen α4~0
．． By limiting it to 6%, it is possible to increase the strength of the screw base material itself after plastic working and quench hardening treatment, so it is possible to increase the strength of the screw base material itself. Rolling forged screws can now be applied to items such as
第１図〜第３図は、転鍛造ネジの加工工程金示す外観図
でｂシ、第１図は、切断工程、第２図は鍛造工程、第３
図は転造工程でるる、第４図は。
炭素量と焼入硬さの関係を求めた実験データーのグラフ
、第５図は、炭素量と塑性加工性の関係を求めた実験デ
ーターのグラフである。
１・・・・・・Ｗ 、ｉ！ｉｌ ２−−ローラー
３・・・・・・ダイ ４・・・・・・カッター５・
・・・・・パンチ ６・・・・・・鍛造上９品７・・
・・・・ローリングカッター板
以 上
第１図
第２図
第３図
＝１１６−
第４図
１１１り図
ｃｔ→Figures 1 to 3 are external views showing the processing steps for rolling forged screws. Figure 1 is the cutting process, Figure 2 is the forging process, and Figure 3 is the forging process.
The figure shows the rolling process, Figure 4. FIG. 5 is a graph of experimental data for determining the relationship between carbon content and quenching hardness. FIG. 5 is a graph of experimental data for determining the relationship between carbon content and plastic workability. 1...W,i! il 2--Roller 3...Die 4...Cutter 5.
...Punch 6...Forged top 9 items 7...
...Rolling cutter plate or more Figure 1 Figure 2 Figure 3 = 116- Figure 4 111 diagram ct→
Claims (1)
６％を含む炭素鋼を用いて焼入れ、焼戻し、の調質全行
なった手金特徴とする転鍛造ネジ。The carbon content of screws used in wristwatches is 0.4 to [1
Roll-forged screws are characterized by being quenched, tempered, and tempered using carbon steel containing 6% carbon steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18063182A JPS5970724A (en) | 1982-10-15 | 1982-10-15 | Rolled hot-forged thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18063182A JPS5970724A (en) | 1982-10-15 | 1982-10-15 | Rolled hot-forged thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5970724A true JPS5970724A (en) | 1984-04-21 |
Family
ID=16086571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18063182A Pending JPS5970724A (en) | 1982-10-15 | 1982-10-15 | Rolled hot-forged thread |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5970724A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54141313A (en) * | 1978-04-21 | 1979-11-02 | Hilti Ag | Copper alloy and production thereof |
| JPS5763635A (en) * | 1980-10-03 | 1982-04-17 | Nippon Steel Corp | Production of steel bar for cold forming |
| JPS5770265A (en) * | 1980-10-22 | 1982-04-30 | Daido Steel Co Ltd | Martensitic stainless steel |
-
1982
- 1982-10-15 JP JP18063182A patent/JPS5970724A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54141313A (en) * | 1978-04-21 | 1979-11-02 | Hilti Ag | Copper alloy and production thereof |
| JPS5763635A (en) * | 1980-10-03 | 1982-04-17 | Nippon Steel Corp | Production of steel bar for cold forming |
| JPS5770265A (en) * | 1980-10-22 | 1982-04-30 | Daido Steel Co Ltd | Martensitic stainless steel |
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