JPH0760335A - Steel pipe drawing method - Google Patents
Steel pipe drawing methodInfo
- Publication number
- JPH0760335A JPH0760335A JP21038593A JP21038593A JPH0760335A JP H0760335 A JPH0760335 A JP H0760335A JP 21038593 A JP21038593 A JP 21038593A JP 21038593 A JP21038593 A JP 21038593A JP H0760335 A JPH0760335 A JP H0760335A
- Authority
- JP
- Japan
- Prior art keywords
- die
- contact angle
- pipe
- base pipe
- 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
Landscapes
- Metal Extraction Processes (AREA)
Abstract
(57)【要約】
【目的】 潤滑処理した炭素鋼や合金鋼の鋼管などを引
抜加工する際に、ダイスと素管の接触角を特定の範囲に
設定して、焼付疵の発生を防止し、加工処理量を増大に
する。
【構成】 潤滑処理した炭素鋼・合金鋼の素管２を引抜
加工するに際し、素管２とダイス１の接触角が４０O 以
下となるような形状のＲ型ダイスを使用する。
【効果】 超硬部の体積が小さい安価なＲ型ダイスを用
いて、炭素鋼・合金鋼の加工材の引抜加工で発生する焼
付を防止し、高品質の製品を高能率で製造できる。
(57) [Abstract] [Purpose] When drawing a lubricated carbon steel or alloy steel pipe, etc., set the contact angle between the die and the base pipe to a specific range to prevent seizure flaws. , Increase the processing amount. [Structure] When a lubricated carbon steel / alloy steel base pipe 2 is drawn, an R-shaped die having a shape such that the contact angle between the base pipe 2 and the die 1 is 40 O or less is used. [Effect] By using an inexpensive R-type die with a small volume of the cemented carbide portion, it is possible to prevent seizure that occurs during the drawing process of the processed material of carbon steel / alloy steel, and to manufacture high-quality products with high efficiency.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、炭素鋼・合金鋼の鋼管
の引抜加工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing a carbon steel / alloy steel pipe.
【０００２】[0002]
【従来の技術】従来、炭素鋼や合金鋼の鋼管を冷間引抜
加工する時には、ダイスの焼付が発生しやすいので、鋼
管の疵発生による低歩留り及び低速引抜加工を余儀なく
されている。2. Description of the Related Art Conventionally, when cold drawing a carbon steel or alloy steel pipe, seizure of a die is likely to occur, so that a low yield and a low speed drawing process are inevitable due to a flaw in the steel pipe.
【０００３】このため、炭素鋼材や合金鋼材の冷間引抜
加工においては、引抜工具と材料の摩擦を軽減し、工具
の磨耗を低減し、焼付疵の発生を防止することが重要で
ある。上記の目的を達成するために、ダイスの材質・形
状、潤滑剤、引抜速度、減面率などについて研究がなさ
れている。Therefore, in cold drawing of carbon steel or alloy steel, it is important to reduce friction between the drawing tool and the material, reduce wear of the tool, and prevent seizure flaws. In order to achieve the above object, research has been conducted on the material and shape of the die, the lubricant, the drawing speed, the surface reduction rate, and the like.
【０００４】そこで、本出願人は特公平４−４８８３９
号公報で、炭素鋼や合金鋼の冷間引抜加工における潤滑
方法を提案している。また、特開昭６２−２２７５１８
号公報で、ステンレス鋼の引抜加工方法が提案されてい
る。Therefore, the applicant of the present invention is Japanese Patent Publication No. 4-48839.
Japanese Patent Laid-Open Publication proposes a lubrication method in cold drawing of carbon steel and alloy steel. Also, JP-A-62-227518
In the publication, a method for drawing stainless steel is proposed.
【０００５】[0005]
【発明が解決しようとする課題】ところが、先に本出願
人が特公平４−４８８３９号公報で提案している潤滑方
法を用いても焼付疵の発生を完全に防止できるものでは
ない。また、特開昭６２−２２７５１８号公報で提案し
ている引抜加工方法の対象はテーパーダイスであり、絞
り部がＲ形状を有したダイス（以下、「Ｒ型ダイス」と
いう）への適用は困難である。However, even if the lubrication method proposed by the applicant in Japanese Patent Publication No. 4-48839 is used, the occurrence of seizure flaws cannot be completely prevented. Further, the target of the drawing method proposed in Japanese Patent Laid-Open No. 62-227518 is a taper die, and it is difficult to apply it to a die having an R shape in the drawing portion (hereinafter referred to as "R type die"). Is.
【０００６】図１（ａ）・（ｂ）に示すように、ダイス
１と素管２の接触角θが大きい程、摩擦が大きくなり、
従来の炭素鋼や合金鋼の冷間引抜加工方法では、上記の
ダイス１と素管２の接触角θを小さくせざるを得ない状
況下で焼付が発生しないように実施され、非能率的であ
った。なお、図１中の３はプラグである。As shown in FIGS. 1 (a) and 1 (b), the larger the contact angle θ between the die 1 and the shell 2, the greater the friction.
In the conventional cold drawing method of carbon steel or alloy steel, it is carried out so that seizure does not occur under the situation where the contact angle θ between the die 1 and the raw pipe 2 has to be made small, which is inefficient. there were. Incidentally, 3 in FIG. 1 is a plug.
【０００７】上記した問題に鑑み、本発明の目的は、潤
滑処理した炭素鋼や合金鋼の鋼管などを引抜加工する際
に、ダイスと素管の接触角を特定の範囲に設定して、焼
付疵の発生を防止し、加工処理量を増大にすることであ
る。In view of the above-mentioned problems, an object of the present invention is to set a contact angle between a die and a raw pipe in a specific range and to bake it when drawing a lubricated carbon steel or alloy steel pipe. It is to prevent the occurrence of flaws and increase the processing amount.
【０００８】[0008]
【課題を解決するための手段】上記した目的を達成する
ために、本発明は、潤滑処理した炭素鋼・合金鋼の加工
材を引抜加工するに際し、加工材とダイスの接触角が４
０O 以下となるような形状のＲ型ダイスを使用するので
ある。In order to achieve the above-mentioned object, the present invention has a contact angle between the work material and the die of 4 when drawing the work material of the lubricated carbon steel / alloy steel.
An R-type die having a shape of 0 O or less is used.
【０００９】[0009]
【作用】本発明者は、実験により各種引抜加工条件と焼
付発生の関係について検討したところ、ダイスと加工材
の接触角を特定の範囲に設定して引抜加工すれば焼付疵
の発生を防止できることを知見した。The present inventor has examined the relationship between various drawing conditions and the occurrence of seizure by experiments, and found that seizure flaws can be prevented by setting the contact angle between the die and the processed material within a specific range and then performing the drawing. I found out.
【００１０】例えば、材質ＳＵＪ２、外径φ９６．０ｍ
ｍ×肉厚ｔ８．８ｍｍの素管を潤滑処理した後に、図１
（ｂ）に示すような絞り部がＲ型ダイスを用いてＲ型ダ
イスと素管の接触角を変化させて、外径φ８３．９ｍｍ
×肉厚ｔ７．４５ｍｍの素管を引抜加工し、その後に、
Ｒ型ダイスと素管の接触角と素管に発生した焼付を測定
した。その測定結果を図２に示す。この時の減面率は２
５．３％である。For example, material SUJ2, outer diameter φ96.0m
After lubrication of a blank tube of m × thickness t8.8 mm, as shown in FIG.
The narrowed portion as shown in (b) uses an R-type die to change the contact angle between the R-type die and the raw pipe, and the outer diameter φ83.9 mm.
× Drawing a blank tube with a wall thickness of t 7.45 mm, and then
The contact angle between the R-type die and the base pipe and the seizure that occurred on the base pipe were measured. The measurement result is shown in FIG. The reduction rate at this time is 2
It is 5.3%.
【００１１】この時、引抜加工に使用したＲ型ダイス及
びプラグの材質はＷＣ−Ｃｏ系超硬合金であり、さら
に、素管との摩擦を低減させるために、プラグの表面に
はＴｉＣとＴｉＮの二層コーティングを施してある。Ｒ
型ダイス及びプラグの表面粗さはＲｍａｘで０．８Ｓ以
下である。At this time, the material of the R-type die and the plug used for the drawing process is WC-Co type cemented carbide, and in order to reduce the friction with the raw pipe, TiC and TiN are formed on the surface of the plug. It has a two-layer coating. R
The surface roughness of the die and plug is 0.8 S or less in Rmax.
【００１２】この図２より、Ｒ型ダイスと素管の接触角
が４０O を越えると、素管外面での焼付発生率が急増
し、４０O 以下であると、素管外面に焼付が発生しない
ことが明らかである。即ち、Ｒ型ダイスと素管の接触角
を４０O 以下になるようなＲ型ダイスを使用すれば、素
管外面に焼付を発生させることなく、素管を引抜加工で
きるのである。From FIG. 2, when the contact angle between the R-type die and the base pipe exceeds 40 O , the seizure occurrence rate on the outer surface of the base pipe sharply increases, and when it is 40 O or less, seizure occurs on the outer surface of the base pipe. Obviously not. That is, by using the R-type die whose contact angle between the R-type die and the base pipe is 40 O or less, the base pipe can be drawn without causing seizure on the outer surface of the base pipe.
【００１３】[0013]
【実施例】先に本出願人が特公平４−４８８３９号公報
で提案している潤滑方法によって材質ＳＵＪ２の素管を
潤滑処理した後に、引抜加工した結果を次の表１に示
す。なお、Ｒ型ダイス及びプラグの材質はＷＣ−Ｃｏ系
超硬合金であり、プラグの表面には素管との摩擦を低減
させるためにＴｉＣとＴｉＮの二層コーティングを施し
てある。Ｒ型ダイス及びプラグの表面粗さはＲｍａｘで
０．８Ｓ以下である。EXAMPLES The following Table 1 shows the results of the drawing process after the material pipe of the material SUJ2 was lubricated by the lubrication method proposed by the applicant in Japanese Patent Publication No. 4-48839. The material of the R-type die and the plug is WC-Co type cemented carbide, and the surface of the plug is coated with two layers of TiC and TiN in order to reduce the friction with the raw pipe. The surface roughness of the R-type die and plug is 0.8 S or less in Rmax.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１より、Ｒ型ダイスと素管の接触角を４
０O 以下にすれば、素管外面に焼付が発生することを防
止できることは明らかである。From Table 1, the contact angle between the R-type die and the raw pipe is 4
It is clear that the seizure on the outer surface of the blank can be prevented by setting it to 0 O or less.
【００１６】[0016]
【発明の効果】以上説明したように、本発明によれば、
超硬部の体積が小さい安価なＲ型ダイスを用いて、炭素
鋼・合金鋼の加工材の引抜加工で発生する焼付を防止
し、高品質の製品を高能率で製造できる。As described above, according to the present invention,
By using an inexpensive R-type die with a small volume of the cemented carbide part, it is possible to prevent seizure that occurs during drawing of carbon steel / alloy steel workpieces and to manufacture high-quality products with high efficiency.
【図１】（ａ）はテーパーダイスを用いた場合のダイス
とプラグによる素管の引抜加工状態を示す図、（ｂ）は
絞り部の形状がＲ形状をしたダイスを用いた場合のダイ
スとプラグによる素管の引抜加工状態を示す図である。FIG. 1 (a) is a diagram showing a drawing process of a raw pipe with a die and a plug when a tapered die is used, and FIG. 1 (b) is a die when a die with an R-shaped narrowed portion is used. It is a figure which shows the drawing-out state of the raw pipe by a plug.
【図２】ダイスと素管の接触角と素管外面での焼付発生
率の関係を示した図である。FIG. 2 is a diagram showing a relationship between a contact angle between a die and a base pipe and a seizure occurrence rate on an outer surface of the base pipe.
１ ダイス ２ 素管 ３ プラグ 1 die 2 element tube 3 plug
Claims (1)
引抜加工するに際し、加工材とダイスの接触角が４０O
以下となるような形状のＲ型ダイスを使用することを特
徴とする鋼管の引抜加工方法。1. When drawing a lubricated carbon steel / alloy steel workpiece, the contact angle between the workpiece and the die is 40 O.
A method for drawing a steel pipe, characterized in that an R-shaped die having the following shape is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21038593A JPH0760335A (en) | 1993-08-25 | 1993-08-25 | Steel pipe drawing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21038593A JPH0760335A (en) | 1993-08-25 | 1993-08-25 | Steel pipe drawing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0760335A true JPH0760335A (en) | 1995-03-07 |
Family
ID=16588466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21038593A Pending JPH0760335A (en) | 1993-08-25 | 1993-08-25 | Steel pipe drawing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0760335A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006272396A (en) * | 2005-03-29 | 2006-10-12 | Sumitomo Metal Ind Ltd | Pipe drawing tool and pipe manufacturing method using the same |
| JP2011152576A (en) * | 2010-01-28 | 2011-08-11 | Sumitomo Metal Ind Ltd | Method of manufacturing small-diameter thin-walled tube |
| KR101157347B1 (en) * | 2007-12-26 | 2012-06-15 | 수미도모 메탈 인더스트리즈, 리미티드 | Covered carbide plug and cold drawing method using the covered carbide plug |
| CN104785560A (en) * | 2015-03-31 | 2015-07-22 | 广东龙丰精密铜管有限公司 | Traveling core head provided with high-hardness working surface |
-
1993
- 1993-08-25 JP JP21038593A patent/JPH0760335A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006272396A (en) * | 2005-03-29 | 2006-10-12 | Sumitomo Metal Ind Ltd | Pipe drawing tool and pipe manufacturing method using the same |
| KR101157347B1 (en) * | 2007-12-26 | 2012-06-15 | 수미도모 메탈 인더스트리즈, 리미티드 | Covered carbide plug and cold drawing method using the covered carbide plug |
| JP2011152576A (en) * | 2010-01-28 | 2011-08-11 | Sumitomo Metal Ind Ltd | Method of manufacturing small-diameter thin-walled tube |
| CN104785560A (en) * | 2015-03-31 | 2015-07-22 | 广东龙丰精密铜管有限公司 | Traveling core head provided with high-hardness working surface |
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