JPH06277746A - Billet for hot extrusion - Google Patents
Billet for hot extrusionInfo
- Publication number
- JPH06277746A JPH06277746A JP7027193A JP7027193A JPH06277746A JP H06277746 A JPH06277746 A JP H06277746A JP 7027193 A JP7027193 A JP 7027193A JP 7027193 A JP7027193 A JP 7027193A JP H06277746 A JPH06277746 A JP H06277746A
- Authority
- JP
- Japan
- Prior art keywords
- billet
- extruding
- dummy member
- force
- 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.)
- Withdrawn
Links
Landscapes
- Extrusion Of Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属素材の熱間押出加
工に用いるビレットに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a billet used for hot extrusion processing of metal materials.
【０００２】[0002]
【従来の技術】熱間押出加工法は１回の加工率が大き
く、且つダイスの交換のみで種々の断面形状の長尺製品
が得られるという利点を有していると共に、圧縮加工で
あるため、変形能が劣る材料も表面欠陥なしで所望の断
面形状が得られることから、多種類の金属加工法として
広く採用されている。しかし、熱間押出加工は金属素材
（以下、ビレットと称す）を密閉された容器（コンテ
ナ）内に挿入し、ビレットの後端を前方に押すことによ
って加工するために、押す力の限界によって素材断面積
や押出製品断面積が制約を受ける。従って、後方からの
押出力、換言すれば熱間押出装置の押出力量（以下単に
力量と称す）によって製造可能な製品寸法が決まる。2. Description of the Related Art The hot extrusion method has the advantages that the rate of one-time processing is large and that long products with various cross-sectional shapes can be obtained only by exchanging dies, and since it is compression processing. Since a material having a low deformability can obtain a desired cross-sectional shape without surface defects, it is widely used as various kinds of metal working methods. However, in hot extrusion processing, a metal material (hereinafter referred to as a billet) is inserted into a closed container (container), and the rear end of the billet is pressed forward to process the material. The cross-sectional area and extruded product cross-sectional area are restricted. Therefore, the product size that can be manufactured is determined by the pushing force from the rear, in other words, the pushing force of the hot extrusion device (hereinafter simply referred to as force).
【０００３】ところで、熱間押出加工時における押出力
は図１に示すように、押出開始時にピークとして現れる
トップピーク押出力ＰT と比較的平坦な推移を示す定常
押出力ＰS とから成っている。ここで、製造可能な製品
寸法を決める押出力はトップピーク押出力ＰT であり、
押出装置の力量がこれ以下では、押出加工は不可能とな
る。換言すれば、定常押出力ＰS が押出装置の力量以下
でも、トップピーク押出力ＰT がそれ以上であれば押出
は不可能である。By the way, as shown in FIG. 1, the pushing force during hot extrusion is composed of a top peak pushing force P T which appears as a peak at the start of extrusion and a steady pushing force P S which shows a relatively flat transition. There is. Here, the pushing force that determines the product size that can be manufactured is the top peak pushing force P T ,
If the force of the extruder is less than this, extrusion cannot be performed. In other words, even if the steady push force P S is less than the force of the extruder, if the top peak push force P T is more than that, extrusion is impossible.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、熱間押出加
工において必要なトップピーク押出力を低減させること
によって、限られた力量を有する熱間押出装置における
製造可能な製品寸法を拡大しようとするものである。SUMMARY OF THE INVENTION The present invention seeks to increase the manufacturable product size in hot extrusion equipment with limited capabilities by reducing the top peak pushing force required in hot extrusion. To do.
【０００５】[0005]
【課題を解決するための手段】前記課題を解決する本発
明の熱間押出用ビレットは、ビレット本体の先端に、熱
間変形抵抗が該ビレット本体の熱間変形抵抗よりも小さ
いダミー部材が固着されていることを特徴とする。また
ダミー部材の熱間変形抵抗がビレット本体の変形抵抗よ
りも２０％以上低いことを特徴とする。さらには、ダミ
ー部材の厚さｔとビレット本体の直径ｄの比が０．１以
上であることを特徴とする。According to the billet for hot extrusion of the present invention for solving the above-mentioned problems, a dummy member having a hot deformation resistance smaller than that of the billet body is fixed to the tip of the billet body. It is characterized by being. Also, the hot deformation resistance of the dummy member is lower than the deformation resistance of the billet body by 20% or more. Further, the ratio of the thickness t of the dummy member to the diameter d of the billet body is 0.1 or more.
【０００６】[0006]
【作用】本発明の熱間押出用ビレットは、ビレット本体
の先端に該ビレット本体の熱間変形抵抗よりも小さい熱
間変形抵抗を有するダミー部材を固着したので押出初期
のトップピーク押出力を低減することができる。このた
め、ビレット本体のトップピーク押出力が押出装置の力
量を超えるビレットであっても押出すことができるので
製造可能な製品寸法が拡大する。In the billet for hot extrusion of the present invention, a dummy member having a hot deformation resistance smaller than the hot deformation resistance of the billet body is fixed to the tip of the billet body, so the top peak pushing force at the initial stage of extrusion is reduced. can do. Therefore, even a billet whose top peak pushing force of the billet body exceeds the force of the extrusion device can be extruded, so that the product size that can be manufactured is expanded.
【０００７】以下、本発明を具体的に説明する。図２
は、図３に示すような外径ｄが７５mmφのＳＵＳ３０４
（変形抵抗は１１００℃で８．６kgf/mm2 、１２００℃
で６．２kgf/mm2 ）のビレット本体２の先端にダミー部
材３としてＳＵＳ３０４よりも変形抵抗の小さい軟鋼板
（Ｓ３５Ｃ）からなる種々厚さのダミー部材３（変形抵
抗は１１００℃で４．７kgf/mm2 、１２００℃で３．５
kgf/mm2 ）を溶接して熱間押出用ビレットとし、このビ
レット１を熱間押出した場合のダミー部材３の厚さ毎の
押出力の挙動を示す。尚、図中の０ｔはダミー部材３を
取り付けなかった場合である。The present invention will be specifically described below. Figure 2
Is an SUS304 with an outer diameter d of 75 mmφ as shown in FIG.
(The deformation resistance is 8.6kgf / mm 2 at 1200 ° C and 1200 ° C.
At the tip of the billet body 2 of 6.2 kgf / mm 2 ), the dummy member 3 as the dummy member 3 is made of a mild steel plate (S35C) having a smaller deformation resistance than SUS304 and has various thicknesses (the deformation resistance is 4.7 kgf at 1100 ° C.). / mm 2 , 3.5 at 1200 ℃
kgf / mm 2) welded to the hot extrusion billet to show the behavior of the extrusion force of each thickness of the dummy member 3 when the billet 1 was hot extruded. Note that 0t in the figure is the case where the dummy member 3 is not attached.
【０００８】この結果から、定常押出力ＰS とトップピ
ーク押出力ＰT を比較すると、ダミー部材の厚さが８mm
未満ではトップピーク押出力ＰT の消滅は見られない
が、８mm以上になるとトップピーク押出力ＰT は定常押
出力ＰS 以下となる。従って、ダミー部材３の変形抵抗
（トップピーク押出力ＰT に比例する）がビレット本体
２の変形抵抗（定常押出力ＰS に比例する）よりも２０
％以上低ければビレット本体の定常押出力ＰS 以下で押
出すことができる。From these results, comparing the steady push force P S with the top peak push force P T , the thickness of the dummy member is 8 mm.
Although not seen disappearance of top peak ejection force P T is less than the top peak pushing force P T becomes equal to or larger than 8mm becomes less steady extrusion force P S. Therefore, the deformation resistance of the dummy member 3 (proportional to the top peak pushing force P T ) is 20 more than the deformation resistance of the billet body 2 (proportional to the steady pushing force P S ).
If it is lower than 0.1%, it can be extruded with a steady pushing force P S of the billet body or less.
【０００９】図４はビレット本体の各素材毎のピーク比
ＰT ／ＰS を示し、各素材のピーク比はほぼ１．２以下
であることから、これらの素材においてはビレット本体
の先端に固着するダミー部材の熱間変形抵抗がビレット
本体の熱間変形抵抗よりも２０％以上低ければビレット
本体の定常押出力ＰS 以下で押出すことができる。FIG. 4 shows the peak ratio P T / P S for each material of the billet body. Since the peak ratio of each material is approximately 1.2 or less, these materials are fixed to the tip of the billet body. If the hot deformation resistance of the dummy member is 20% or more lower than the hot deformation resistance of the billet body, the billet body can be extruded with a steady pushing force P S or less.
【００１０】図５は、ダミー部材としてＳ３５Ｃを用
い、ビレット本体としてＳＵＳ３０４を用いて熱間押出
したときのダミー部材の厚さｔとビレットの直径ｄの比
（ｔ／ｄ）とトップピーク押出力およびピーク比（ＰT
／ＰS ）の挙動を示す。この結果から、ビレットの直径
に対するダミー部材の厚さの比（ｔ／ｄ）の増加と共に
トップピーク押出力およびピーク比は減少して、ｔ／ｄ
が０．１以上になるとトップピーク押出力はＳＵＳ３０
４の定常押出力以下のレベルとなる。従って、ｔ／ｄを
０．１以上にすることによってトップピークを消滅させ
ることができるので製造可能な製品寸法の拡大が可能と
なる。FIG. 5 shows a ratio (t / d) between the thickness t of the dummy member and the diameter d of the billet and the top peak pushing force when S35C is used as the dummy member and SUS304 is used as the billet body. And the peak ratio (P T
/ Show the behavior of the P S). From this result, as the ratio of the thickness of the dummy member to the diameter of the billet (t / d) increases, the top peak pushing force and the peak ratio decrease and t / d
Is 0.1 or above, the top peak pushing force is SUS30
The level is below the steady push output of 4. Therefore, by setting t / d to 0.1 or more, the top peak can be eliminated, and the size of manufacturable products can be expanded.
【００１１】以上のことを図２の例で示せば次のように
なる。押出力曲線を示す図２から押出装置の力量がＰで
あるとすると、ダミー部材を固着しない場合はトップピ
ーク押出力ＰT は押出力量Ｐよりも大きくなるために押
出加工はできず、ビレットはダイスから流れ出ない。し
かし、ｔ／ｄが０．１以上となる厚さ（図２ではダミー
部材の厚さが８mm以上）を有する変形抵抗の小さいダミ
ー部材をビレット本体の先端に固着するとトップピーク
押出力ＰT は押出装置の力量Ｐよりも小さくなるために
押出は可能となる。The above is illustrated in the example of FIG. 2 as follows. As shown in FIG. 2 showing the pushing force curve, assuming that the force of the extruder is P, the top peak pushing force P T becomes larger than the pushing force amount P when the dummy member is not fixed. It doesn't flow from the die. However, if a dummy member having a small deformation resistance having a thickness of t / d of 0.1 or more (the thickness of the dummy member is 8 mm or more in FIG. 2) is fixed to the tip of the billet body, the top peak pushing force P T is Since the force P of the extruder is smaller than that of the extruder, extrusion is possible.
【００１２】[0012]
【実施例】以下、実施例について説明する。表１に、押
出力量４００トンの熱間押出装置における押出条件およ
び押出結果を示す。ビレット本体の素材はＳＵＳ３０４
ステンレス鋼であり、ビレット本体の先端にダミー部材
として軟鋼板（Ｓ３５Ｃ）を溶接によって取り付けた。
ビレット加熱温度は１２００℃であり、１２００℃にお
けるＳＵＳ３０４の変形抵抗は６．２kgf/mm2 、Ｓ３５
Ｃの変形抵抗は３．５kgf/mm2 で、ダミー部材の変形抵
抗がビレット本体の変形抵抗よりも４３．５％低い。潤
滑ガラスにはＳｉＯ2−Ｎａ2 Ｏ−Ａｌ2 Ｏ3 系を適用
した。EXAMPLES Examples will be described below. Table 1 shows the extrusion conditions and the extrusion results in the hot extrusion apparatus with an output of 400 tons. The material of the billet body is SUS304
A mild steel plate (S35C), which was stainless steel, was attached to the tip of the billet body by welding as a dummy member.
The billet heating temperature is 1200 ° C, and the deformation resistance of SUS304 at 1200 ° C is 6.2 kgf / mm 2 , S35.
The deformation resistance of C is 3.5 kgf / mm 2 , and the deformation resistance of the dummy member is 43.5% lower than that of the billet body. A SiO 2 —Na 2 O—Al 2 O 3 system was applied to the lubricating glass.
【００１３】本発明例および比較例共にダイス半角９
０，４５°のダイスを用い、押出比（ビレット本体の断
面積／押出製品の断面積）は全て１４である。尚、No．
５は軟鋼板を取り付けない従来例である。表１から、軟
鋼板の厚さとビレット直径の比（ｔ／ｄ）が０．１以上
であればトップピーク比（ＰT ／ＰS ）は１．０以下と
なりトップピークは認められない。なお、押出装置の力
量が例えば２１０トンの場合ではNo．６〜８はトップピ
ーク押出力が力量超であるために押出不可能であるが、
No．１〜４ではトップピーク押出力は力量以下になるた
めに押出は可能となる。In both the examples of the present invention and the comparative examples, half-width dice 9
The extrusion ratio (cross-sectional area of the billet body / cross-sectional area of the extruded product) is 14 using a die of 0,45 °. Incidentally, No.
5 is a conventional example in which a mild steel plate is not attached. From Table 1, when the ratio of the thickness of the mild steel plate to the billet diameter (t / d) is 0.1 or more, the top peak ratio (P T / P S ) is 1.0 or less and no top peak is observed. In addition, when the capacity of the extruder is 210 tons, for example, Nos. 6 to 8 cannot be extruded because the top peak pushing force is too large, but
No. In Nos. 1 to 4, the top peak pushing force is less than the force, and therefore extrusion is possible.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【発明の効果】本発明により、押出装置の押出力量をア
ップすることなく押出可能範囲が拡大するために、従来
法では押出不可能であった製品の製造が可能となる。従
って、ユーザーの要望に応えうる範囲も拡がるために、
産業界に多大なメリットを与えるものである。According to the present invention, since the extrudable range is expanded without increasing the pushing force of the extruder, it is possible to manufacture a product which cannot be extruded by the conventional method. Therefore, in order to expand the range that can meet the needs of users,
It is a great advantage to the industrial world.
【図１】熱間押出加工における押出力の挙動を示す図で
ある。FIG. 1 is a diagram showing a behavior of pushing force in hot extrusion processing.
【図２】熱間押出用ビレットの先端に取り付けたダミー
部材の厚さ毎の押出力の挙動を示す図である。FIG. 2 is a diagram showing a behavior of pushing force for each thickness of a dummy member attached to the tip of a hot-extrusion billet.
【図３】本発明の熱間押出用ビレットを示す断面図であ
る。FIG. 3 is a sectional view showing a billet for hot extrusion of the present invention.
【図４】ビレット素材毎の押出力比を示す図である。FIG. 4 is a diagram showing a pushing force ratio for each billet material.
【図５】ダミー部材の厚さとビレットの直径との比とト
ップピーク押出力およびピーク比の挙動を示す図であ
る。FIG. 5 is a diagram showing the behavior of the ratio of the thickness of the dummy member to the diameter of the billet, the top peak pushing force, and the peak ratio.
１ 本発明の熱間押出用ビレット ２ ビレット本体 ３ ダミー部材（軟鋼板） 1 Billet for hot extrusion of the present invention 2 Billet body 3 Dummy member (mild steel plate)
Claims (3)
該ビレット本体の熱間変形抵抗よりも小さいダミー部材
が固着されていることを特徴とする熱間押出用ビレッ
ト。1. A billet for hot extrusion, wherein a dummy member having a hot deformation resistance smaller than that of the billet body is fixed to the tip of the billet body.
体の熱間変形抵抗よりも２０％以上低いことを特徴とす
る請求項１に記載の熱間押出用ビレット。2. The hot-extrusion billet according to claim 1, wherein the hot deformation resistance of the dummy member is 20% or more lower than the hot deformation resistance of the billet body.
径ｄの比ｔ／ｄが０．１以上であることを特徴とする請
求項１又は請求項２に記載の熱間押出用ビレット。3. The hot-extrusion billet according to claim 1, wherein a ratio t / d of the thickness t of the dummy member and the diameter d of the billet body is 0.1 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7027193A JPH06277746A (en) | 1993-03-29 | 1993-03-29 | Billet for hot extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7027193A JPH06277746A (en) | 1993-03-29 | 1993-03-29 | Billet for hot extrusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06277746A true JPH06277746A (en) | 1994-10-04 |
Family
ID=13426698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7027193A Withdrawn JPH06277746A (en) | 1993-03-29 | 1993-03-29 | Billet for hot extrusion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06277746A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018094565A (en) * | 2016-12-09 | 2018-06-21 | 新日鐵住金株式会社 | Manufacturing method of seamless metallic pipe |
-
1993
- 1993-03-29 JP JP7027193A patent/JPH06277746A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018094565A (en) * | 2016-12-09 | 2018-06-21 | 新日鐵住金株式会社 | Manufacturing method of seamless metallic pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000530 |