JPH084164Y2 - Seamless steel pipe hot extrusion mandrel - Google Patents
Seamless steel pipe hot extrusion mandrelInfo
- Publication number
- JPH084164Y2 JPH084164Y2 JP1990064193U JP6419390U JPH084164Y2 JP H084164 Y2 JPH084164 Y2 JP H084164Y2 JP 1990064193 U JP1990064193 U JP 1990064193U JP 6419390 U JP6419390 U JP 6419390U JP H084164 Y2 JPH084164 Y2 JP H084164Y2
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- extrusion
- groove
- steel pipe
- hot extrusion
- 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
Landscapes
- Extrusion Of Metal (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案はガラス潤滑剤を用いる熱間押出方法による継
目無鋼管熱間押出用マンドレルに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a mandrel for hot extrusion of a seamless steel pipe by a hot extrusion method using a glass lubricant.
（従来の技術） 従来の熱間押出の状況を第４図に示す。押出管３はダ
イス４とマンドレル５とのクリアランスよりビレット６
を押出すことにより成形される。押出管３の内面を成形
するマンドレル５は成形部5Aとステップ部5Bおよびネジ
部5Cとからなる。押出時の潤滑作用はビレット６の外内
面に散布されたガラス粉が溶融付着し、ビレット６とダ
イス４およびマンドレル５との間に溜まった潤滑膜７、
８によって得られる。(Prior Art) FIG. 4 shows the state of conventional hot extrusion. The extruded tube 3 has a billet 6 due to the clearance between the die 4 and the mandrel 5.
Is extruded. The mandrel 5 that molds the inner surface of the extruded tube 3 includes a molding portion 5A, a step portion 5B, and a screw portion 5C. The lubricating action at the time of extrusion is that the glass powder scattered on the outer and inner surfaces of the billet 6 melts and adheres, and the lubricating film 7 accumulated between the billet 6 and the die 4 and the mandrel 5
Obtained by 8.
管内面の潤滑剤の供給はビレット６の内面にガラス粉
を散布するものであり、供給できる潤滑剤の量はビレッ
ト内面に付着できる量に限られる。The supply of the lubricant on the inner surface of the pipe is to scatter glass powder on the inner surface of the billet 6, and the amount of the lubricant that can be supplied is limited to the amount that can be attached to the inner surface of the billet.
従来の熱間押出用マンドレル５を使用した場合、供給
する潤滑剤を増やしてもビレット６へのマンドレル５の
挿入時やアプセット時に潤滑剤が流れ出し、実際に潤滑
に寄与する潤滑剤の量をコントロールすることは極めて
難しい。When the conventional hot extruding mandrel 5 is used, the lubricant flows out when the mandrel 5 is inserted into the billet 6 or when the mandrel 5 is upset even if more lubricant is supplied, and the amount of lubricant that actually contributes to lubrication is controlled. It is extremely difficult to do.
また、押出比が高くなる程、潤滑膜の面圧は高くな
り、潤滑が苛酷になる。特に、押出比が50を超えると、
管内面の潤滑不良によるマンドレルの損傷や押出管の表
面不良が頻繁に発生する。実用押出比内においても押出
比が高くなる程、押出管と工具との焼付や工具の変形、
それに伴う押出管の表面不良が発生し易くなる。Further, the higher the extrusion ratio, the higher the surface pressure of the lubricating film, and the more severe the lubrication becomes. Especially when the extrusion ratio exceeds 50,
Damage to the mandrel and defective surface of the extruded tube frequently occur due to poor lubrication of the inner surface of the tube. Even within the practical extrusion ratio, the higher the extrusion ratio, the seizure between the extrusion pipe and the tool and the deformation of the tool,
As a result, surface defects of the extruded pipe are likely to occur.
このため、マンドレルの寿命が短く、取替え頻度が高
くなり、工具原単位、作業能率および製品歩留が低下す
るという問題があった。For this reason, there has been a problem that the life of the mandrel is short, the replacement frequency is high, and the tool basic unit, work efficiency, and product yield are reduced.
（考案が解決しようとする課題） 従来、管内面の潤滑不良を防止するための方法として
は、例えば実開昭62-137607号公報が知られている。し
かし、当技術ではマンドレルのステップ部に押出方向と
平行に溝を設け、押出管ボトムのみの潤滑を改善し、寸
法不良の発生を防止したものであり、押出管全長の潤滑
不良防止やマンドレルの損傷防止には寄与しない。(Problems to be Solved by the Invention) Conventionally, for example, Japanese Utility Model Laid-Open No. 62-137607 has been known as a method for preventing poor lubrication of the inner surface of a pipe. However, in this technology, a groove is provided in the step portion of the mandrel in parallel with the extrusion direction to improve the lubrication of only the bottom of the extruded tube and prevent the occurrence of dimensional defects. Does not contribute to damage prevention.
本考案は高い押出比の熱間押出において、管全長に亘
る内面潤滑作用の向上を図ることを目的とする。It is an object of the present invention to improve the inner surface lubricating effect over the entire length of a hot extrusion with a high extrusion ratio.
（課題を解決するための手段） 本考案は上記の問題点を解決するために第１図、第２
図に示すマンドレル１の成形部1Aの周面に、該成形部1A
の周面を一周以上し且つ前記マンドレルの軸となす角度
θが60°〜90°の傾きを有する螺旋状の溝2Bを設けたこ
とを特徴とする。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention is provided with reference to FIGS.
On the peripheral surface of the molding portion 1A of the mandrel 1 shown in the drawing, the molding portion 1A
Is provided with a spiral groove 2B having one or more rounds of the peripheral surface and having an angle θ of 60 ° to 90 ° with the axis of the mandrel.
本考案の目的を達成するためにマンドレル１に設ける
溝2Bは、マンドレル１の成形部1Aの全長に設けるのが望
ましいが、管内面の潤滑不良が発生し易いのは押出力が
ピークを呈する押出管のトップとボトム近傍であり、潤
滑の苛酷さが押出管全長に亘って一様でないため、第３
図に示すようにマンドレルの成形部1Aの潤滑不良が発生
し易い部分S1、S2にのみ溝２を設けても潤滑改善の効果
がある。In order to achieve the object of the present invention, it is desirable that the groove 2B provided in the mandrel 1 be provided in the entire length of the molding portion 1A of the mandrel 1. However, it is easy to cause lubrication failure on the inner surface of the pipe. It is near the top and bottom of the pipe, and the severity of lubrication is not uniform over the entire length of the extruded pipe.
As shown in the figure, even if the groove 2 is provided only in the portions S 1 and S 2 of the mandrel molded portion 1A where poor lubrication is likely to occur, there is an effect of improving lubrication.
ただし、管内面の潤滑状態はマンドレルの周方向に亘
って軸対称に一様であることが必要であるため、マンド
レルの成形部1Aに設ける溝2Bは周面を一周以上する必要
があり、該溝が一周未満の場合には部分的に潤滑不良が
発生する場合がある。However, since the lubrication state of the inner surface of the pipe needs to be uniform in axial symmetry along the circumferential direction of the mandrel, the groove 2B provided in the molded portion 1A of the mandrel needs to make one round or more of the circumferential surface. If the groove is less than one turn, partial lubrication may occur.
また、溝2Bの方向がマンドレルの軸Ｏと平行であるか
平行に近づくと、押出管の内面に筋疵が生じるため、溝
2Bの方向はマンドレルの軸Ｏと直交する方向か、または
直交する方向に対し傾きを有することが必要である。Further, when the direction of the groove 2B is parallel to or close to the axis O of the mandrel, the groove on the inner surface of the extruded tube is damaged.
The direction of 2B needs to be orthogonal to the mandrel axis O or to have an inclination with respect to the orthogonal direction.
溝2Bの傾きはマンドレルの軸Ｏとのなす角度θが60°
〜90°であることが必要である。θが60°よりも小さい
と、押出の初期に押出管と共に潤滑剤が流れ出し、潤滑
向上に寄与しない。さらに、θが60°よりも小さい螺旋
状の溝2Bとした場合は、押出中にマンドレルが旋回し、
マンドレルを保持しているマンドレルホルダーのネジ
（図示せず）が弛んでマンドレルが抜ける場合や、ネジ
が締まり過ぎてネジを破損する場合がある。The inclination angle of the groove 2B is 60 ° with the axis O of the mandrel.
Must be ~ 90 °. When θ is smaller than 60 °, the lubricant flows out together with the extruded pipe at the initial stage of extrusion and does not contribute to improvement of lubrication. Furthermore, when θ is a spiral groove 2B smaller than 60 °, the mandrel turns during extrusion,
There is a case where a screw (not shown) of the mandrel holder holding the mandrel is loosened and the mandrel comes off, or the screw is tightened too much and the screw is damaged.
また、溝2Bの寸法は適正な潤滑溜りを形成し、かつ山
部の強度を確保するために、第２図に示す溝深さＤを0.
1〜0.5mm,溝ピッチＰを0.1〜5.0mm、溝幅Ｗを溝ピッチ
の20〜80％とするのが望ましい。Further, the dimension of the groove 2B is such that the groove depth D shown in FIG.
It is desirable that the groove pitch P is 1 to 0.5 mm, the groove pitch P is 0.1 to 5.0 mm, and the groove width W is 20 to 80% of the groove pitch.
（作用） 本考案のマンドレル１を使用すると、ビレット６の内
面に供給した潤滑剤がアプセット時に溝2Bに溜まり、潤
滑剤のビレット内面からの流出を抑制できる。溝2Bに溜
まった潤滑剤は、押出比によって変化する面圧の大きさ
にかかわらず一定厚さの潤滑膜を形成する。(Operation) When the mandrel 1 of the present invention is used, the lubricant supplied to the inner surface of the billet 6 is collected in the groove 2B at the time of upset, and the outflow of the lubricant from the inner surface of the billet can be suppressed. The lubricant accumulated in the groove 2B forms a lubricating film having a constant thickness regardless of the magnitude of the surface pressure that changes depending on the extrusion ratio.
また、マンドレル成形部1Aの押出管３と接触する表面
積が小さいために、押出管内面およびマンドレル表面に
作用する摩擦力が低減し、焼付が発生し難い。さらに、
焼付が発生した場合においても、マンドレル１と押出管
３が連続的に接触しないので、押出管の不良部を狭い領
域に抑制できる。Further, since the surface area of the mandrel molding portion 1A that contacts the extruded tube 3 is small, the frictional force acting on the inner surface of the extruded tube and the surface of the mandrel is reduced, and seizure hardly occurs. further,
Even if seizure occurs, the mandrel 1 and the extruded tube 3 do not continuously contact each other, so that the defective portion of the extruded tube can be suppressed to a narrow area.
そのため、本考案のマンドレル１を使用すれば、従来
のマンドレル５を使用した押出に比べ、高い押出比にお
いても内面の潤滑不良を誘発し難いので、マンドレル１
の損傷や押出管３の不良が発生しない。さらに、従来の
押出可能範囲内においても管内面の潤滑作用が向上する
ために、マンドレル１の損傷や押出管３の不良発生頻度
が低減し、マンドレルの寿命を延長できる。Therefore, when the mandrel 1 of the present invention is used, it is difficult to induce poor lubrication of the inner surface even at a high extrusion ratio, as compared with the conventional extrusion using the mandrel 5.
And damage to the extruded tube 3 does not occur. Further, since the lubrication action on the inner surface of the pipe is improved even within the conventional extrudable range, the frequency of damage to the mandrel 1 and the defective occurrence of the extruded pipe 3 can be reduced, and the life of the mandrel can be extended.
（実施例） マンドレル成形部の全長にマンドレルの軸とほぼ直交
する螺旋状の旋削加工によって設けたマンドレルを使用
して熱間押出を実施した。(Example) A hot extrusion was carried out using a mandrel provided on the entire length of the mandrel forming part by a spiral turning process substantially orthogonal to the axis of the mandrel.
溝の寸法は幅0.5mm,深さ0.5mm,ピッチ1.0mmである。
押出の素材としては外径φ150〜170mm、長さ400mmのSUS
304ステンレス鋼を使用し、外径φ30〜50mm、肉厚2.0〜
10.0mm、長さ５〜30mmの鋼管を押出温度1190〜1230℃と
し、ガラス潤滑剤を用いて押出した。The dimensions of the groove are 0.5 mm width, 0.5 mm depth, and 1.0 mm pitch.
As extrusion material, SUS with outer diameter φ150-170mm and length 400mm
Using 304 stainless steel, outer diameter φ30 ~ 50 mm, wall thickness 2.0 ~
A steel pipe having a length of 10.0 mm and a length of 5 to 30 mm was extruded at a temperature of 1190 to 1230 ° C and extruded using a glass lubricant.
そのときの押出比とマンドレル寿命の関係を第５図に
示す。The relationship between the extrusion ratio and the mandrel life at that time is shown in FIG.
押出比が従来の押出可能限界である50を超えた80以下
において、マンドレルの損傷や押出管の不良を発生せず
して実操業に適用可能な10本以上の押出ができた。ま
た、従来の押出可能限界である押出比50において、従来
のマンドレルに比べマンドレル寿命が２倍に向上した。At an extrusion ratio of 80 or less, which exceeds the conventional extrudable limit of 50, it was possible to extrude 10 or more strands applicable to actual operation without causing damage to the mandrel or defective extrusion tubes. In addition, at the extrusion ratio of 50, which is the limit of extrudability in the past, the mandrel life was doubled compared to the conventional mandrel.
（考案の効果） 本考案のマンドレルを用いることにより、実操業にお
いて押出比80までの押出が可能となった。また、押出比
30〜50の押出において、従来のマンドレルを用いた場合
と比べてマンドレル寿命が1.2〜2.0倍に延長し、工具原
単位が1.5倍向上した。さらに、作業能率が５％、製品
歩留が0.2％それぞれ向上した。(Effect of the invention) By using the mandrel of the present invention, it is possible to extrude up to an extrusion ratio of 80 in actual operation. Also, the extrusion ratio
In the extrusion of 30 to 50, the mandrel life was extended 1.2 to 2.0 times and the tool unit consumption was improved 1.5 times as compared with the case of using the conventional mandrel. Furthermore, the work efficiency improved by 5% and the product yield improved by 0.2%.
第１図は本考案の熱間押出用マンドレルを示す説明図、
第２図（ａ）はマンドレルに設けた溝の拡大図、第２図
（ｂ）は第２図（ａ）の部分拡大図、第３図は本考案の
熱間押出用マンドレルの他の例を示す説明図、第４図は
熱間押出による継目無鋼管押出中の断面図、第５図は実
施例における押出比とマンドレル寿命の関係を示す図表
である。 1:本考案のマンドレル （1A:成形部、1B:ステップ部、1C:ネジ部） 2B:螺旋状の溝 3:押出管 4:ダイス 5:従来のマンドレル （5A:成形部、5B:ステップ部、5C:ネジ部） 6:ビレット 7:ビレットの外面潤滑膜 8:ビレットの内面潤滑膜FIG. 1 is an explanatory view showing a hot extrusion mandrel of the present invention,
2 (a) is an enlarged view of a groove formed in the mandrel, FIG. 2 (b) is a partially enlarged view of FIG. 2 (a), and FIG. 3 is another example of the hot-extrusion mandrel of the present invention. 4 is a cross-sectional view during extrusion of a seamless steel pipe by hot extrusion, and FIG. 5 is a chart showing the relationship between the extrusion ratio and the mandrel life in the example. 1: Mandrel of the present invention (1A: forming part, 1B: step part, 1C: screw part) 2B: spiral groove 3: extrusion tube 4: die 5: conventional mandrel (5A: forming part, 5B: step part) , 5C: Screw part) 6: Billet 7: Lubrication film on outer surface of billet 8: Lubrication film on inner surface of billet
Claims (1)
周面を一周以上し且つ前記マンドレルの軸となす角度θ
が60°〜90°の傾きを有する螺旋状の溝を設けたことを
特徴とする継目無鋼管熱間押出用マンドレル。1. An angle .theta. Formed on the peripheral surface of the mandrel molding portion and extending from the peripheral surface of the molding portion one or more times to the axis of the mandrel.
A mandrel for hot extrusion of seamless steel pipe, characterized in that a spiral groove having an inclination of 60 ° to 90 ° is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990064193U JPH084164Y2 (en) | 1990-06-18 | 1990-06-18 | Seamless steel pipe hot extrusion mandrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990064193U JPH084164Y2 (en) | 1990-06-18 | 1990-06-18 | Seamless steel pipe hot extrusion mandrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0422113U JPH0422113U (en) | 1992-02-24 |
| JPH084164Y2 true JPH084164Y2 (en) | 1996-02-07 |
Family
ID=31594913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990064193U Expired - Lifetime JPH084164Y2 (en) | 1990-06-18 | 1990-06-18 | Seamless steel pipe hot extrusion mandrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084164Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60176811U (en) * | 1984-04-28 | 1985-11-22 | 日本軽金属株式会社 | Extrusion machine mandrel device |
-
1990
- 1990-06-18 JP JP1990064193U patent/JPH084164Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0422113U (en) | 1992-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |