JPH04138816A - Method for correcting hard-to-work material by hot extrusion - Google Patents
Method for correcting hard-to-work material by hot extrusionInfo
- Publication number
- JPH04138816A JPH04138816A JP26152690A JP26152690A JPH04138816A JP H04138816 A JPH04138816 A JP H04138816A JP 26152690 A JP26152690 A JP 26152690A JP 26152690 A JP26152690 A JP 26152690A JP H04138816 A JPH04138816 A JP H04138816A
- Authority
- JP
- Japan
- Prior art keywords
- extruded
- outer skin
- core material
- difficult
- insulating layer
- 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
- 239000000463 material Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims description 33
- 238000001192 hot extrusion Methods 0.000 title claims description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 230000006698 induction Effects 0.000 claims abstract description 14
- 239000011162 core material Substances 0.000 abstract description 32
- 238000001125 extrusion Methods 0.000 description 11
- 238000005452 bending Methods 0.000 description 7
- 230000005496 eutectics Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910002593 Fe-Ti Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Straightening Metal Sheet-Like Bodies (AREA)
- Extrusion Of Metal (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、常温では加工困難な難加工材の外側をそれよ
りも加工性に優れた外皮材で被覆した複合ビレットを熱
間押出しすると共に、押出材の曲がりを矯正する方法に
関する。Detailed Description of the Invention (Industrial Field of Application) The present invention involves hot extruding a composite billet in which the outside of a difficult-to-process material that is difficult to process at room temperature is covered with a skin material that has better processability. , relates to a method for straightening curvature of extruded material.
（従来の技術）
従来、難加工材を熱間押出する場合、第３図に示すよう
に、難加工材１１を芯材とし、その外側をそれよりも加
工性に優れた外皮材１２で被覆した複合ビレットに加工
し、この複合ビレットを所定温度に加熱して熱間押出す
ることか一般に知られている。尚、１３は電子ビーム溶
接による接合部を示す。(Prior art) Conventionally, when hot-extruding difficult-to-process materials, as shown in FIG. 3, a difficult-to-process material 11 is used as a core material, and the outside thereof is covered with a skin material 12 that has better workability. It is generally known to process the composite billet into a composite billet, heat the composite billet to a predetermined temperature, and hot extrude it. Note that 13 indicates a joint portion formed by electron beam welding.
難加工材に対してこのような熱間押出方法を採用する理
由は、難加工材ビレットそのものを直接熱間押出すると
、加熱から押出し開始に至るまでに大気、潤滑側、押出
コンテナ等に触れるためビレット表面が冷却されてしま
い、押出加工中、延性が保てずにビレットが割れてしま
う。これに対して、複合ビレットに加工すると、冷却が
激しい表面には外皮材が存在するので難加工材そのもの
の冷却が防止され、また押出加工中も保熱されるため円
滑な押出ができるためとされている。The reason why such a hot extrusion method is adopted for difficult-to-process materials is that if the billet of difficult-to-process materials is directly hot extruded, it will come into contact with the atmosphere, the lubricating side, the extrusion container, etc. from heating to the start of extrusion. The billet surface is cooled and ductility cannot be maintained during extrusion, resulting in billet cracking. On the other hand, when processed into a composite billet, there is a skin material on the surface where cooling is intense, which prevents the difficult-to-process material itself from cooling, and also retains heat during extrusion, allowing smooth extrusion. ing.
（発明が解決しようとする課題）
しかしながら、複合ビレットは炉出しから加工開始まで
の間、冷たい雰囲気にさらされるので、難加工材を押出
温度に保持するには、外皮材をある程度の厚みに形成す
る必要がある。そのため、必然的に難加工材の大きさ（
直径）は制限され、加工歩留りが悪くなっていた。(Problem to be solved by the invention) However, since the composite billet is exposed to a cold atmosphere from the time it is taken out of the furnace until the start of processing, it is necessary to form the outer skin material to a certain thickness in order to maintain the difficult-to-process material at the extrusion temperature. There is a need to. Therefore, the size of difficult-to-process materials (
diameter) was limited, resulting in poor processing yields.
また、押出材は熱間押出後、急速に温度が低下するため
、押出直後に強制的に押出材の曲がりを塑性変形させて
矯正することができず、−旦、押出した後に曲がりを矯
正することが必要となる。In addition, since the temperature of extruded materials rapidly decreases after hot extrusion, it is not possible to forcibly correct the bending of the extruded material by plastically deforming it immediately after extrusion. This is necessary.
矯正法としては、押出材を塑性変形可能な温度に加熱し
、軸方向に引張ればよい。加熱手段としては、インダク
ションヒータによる誘導加熱が設備も簡単でエネルギー
効率もよいため好適である。As a straightening method, the extruded material may be heated to a temperature at which it can be plastically deformed, and then pulled in the axial direction. As the heating means, induction heating using an induction heater is suitable because the equipment is simple and energy efficient.
しかし、押出材は表面から急速加熱されるため、熱応力
が生じ、これによって延性がほとんどない芯材が割れる
という問題がある。尚、矯正用引張装置のチャック部を
炉中に設け、押出材と共にチャックごと低速加熱して塑
性変形域まで加熱すれば熱応力の問題は解消するが、熱
効率が悪く、処理に時間がかかり、又チャックの材質と
して高温耐熱性に優れた特殊なものを必要とするという
問題がある。However, since the extruded material is rapidly heated from the surface, thermal stress is generated, which causes the problem that the core material, which has little ductility, cracks. Incidentally, the problem of thermal stress can be solved by installing the chuck part of the straightening tension device in a furnace and heating the chuck together with the extruded material at a low speed until it reaches the plastic deformation range, but the thermal efficiency is poor and the processing takes a long time. Another problem is that the chuck requires a special material with excellent high-temperature resistance.
本発明はかかる問題に鑑みなされたもので、加熱した複
合ビレットの保温効果を高め、また押出材の曲がりの矯
正に際し、誘導加熱によって加熱することができる難加
工材の熱間押出矯正方法を提供することを目的とする。The present invention was made in view of such problems, and provides a method for hot extrusion straightening of difficult-to-process materials, which increases the heat retention effect of a heated composite billet, and can heat the extruded material by induction heating when straightening the bending of the extruded material. The purpose is to
（課題を解決するための手段）
上記目的を達成するためになされた本発明の熱間押出矯
正方法は、常温では加工困難な難加工材の外側を断熱層
を介して前記難加工材よりも加工性に優れた外皮材で被
覆した複合ビレットを加熱して熱間押出した後、押出材
の両端部を把持し、その間を誘導加熱すると共に引張り
、押出材の曲がりを矯正することを発明の構成とするも
のである。(Means for Solving the Problems) The hot extrusion straightening method of the present invention, which has been made in order to achieve the above object, is such that the outer side of the difficult-to-process material, which is difficult to process at room temperature, is After heating and hot extruding a composite billet covered with an outer skin material with excellent workability, the invention aims to straighten the bends of the extruded material by gripping both ends of the extruded material and applying induction heating and pulling between them. The structure is as follows.
（作 用）
本発明によれば、難加工材（芯材）１と外皮材２との界
面に断熱層３を形成することにより、芯材１と外皮材２
とは直接接触しなくなり、断熱層３により、芯材１と外
皮材２との熱の移動が抑制され、結果として芯材１の温
度が保持され、従来に比べてうすい厚みの外皮材２でも
押出加工が可能になる。(Function) According to the present invention, by forming the heat insulating layer 3 at the interface between the difficult-to-process material (core material) 1 and the outer skin material 2, the core material 1 and the outer skin material 2
The heat insulating layer 3 suppresses the transfer of heat between the core material 1 and the outer skin material 2, and as a result, the temperature of the core material 1 is maintained, even if the outer skin material 2 is thinner than before. Extrusion processing becomes possible.
前記断熱層３を形成しない場合、押出温度が画材の合金
の共晶点以上必要なとき、画材の接触部が共晶反応を起
こし、゛溶融状態となるため、熱間押出を行うことがで
きない。しかし、本発明では断熱層３が形成されている
ため、画材は非接触状態となり、画材の組み合せに拘ら
ず、共晶反応が生じず、円滑な熱間押出を行うことがで
きる。If the heat insulating layer 3 is not formed, when the extrusion temperature is required to be higher than the eutectic point of the alloy of the art material, the contact area of the art material will undergo a eutectic reaction and become in a molten state, making hot extrusion impossible. . However, in the present invention, since the heat insulating layer 3 is formed, the art materials are in a non-contact state, and regardless of the combination of art materials, no eutectic reaction occurs and smooth hot extrusion can be performed.
また、押出材にも芯材と外皮材との間に断熱層が介在す
るため、誘導加熱により急速な加熱を行っても、前記断
熱層が熱的緩衝材として作用し、芯材の温度勾配ひいて
は熱応力が緩和され、芯材の割れの発生が防止される。In addition, since extruded materials also have a heat insulating layer interposed between the core material and the outer skin material, even if rapid heating is performed by induction heating, the heat insulating layer acts as a thermal buffer, causing a temperature gradient in the core material. As a result, thermal stress is alleviated and cracking of the core material is prevented.
また、押出材を直接加熱することができるため、温度制
御も容品に行うことができる。Furthermore, since the extruded material can be directly heated, temperature control can also be performed on the container.
更に、引張装置のチャック部が装着される押出材の両端
部は加熱されないので、チャック部の加熱に要する無駄
な熱エネルギーを節約することができ、またチャック部
も特殊な耐熱合金を使用しなくて済む。Furthermore, since both ends of the extruded material to which the chuck part of the tensioning device is attached are not heated, wasted thermal energy required to heat the chuck part can be saved, and the chuck part does not require the use of special heat-resistant alloys. It's done.
（実施例）
第１図は本発明において熱間押出に使用される複合ビレ
ットであり、芯材１は断熱層３を介して外皮材２によっ
て被覆されており、４は溶接部である。(Example) FIG. 1 shows a composite billet used for hot extrusion in the present invention, in which a core material 1 is covered with a skin material 2 via a heat insulating layer 3, and 4 is a welded part.
芯材１としては種々の難加工材を用いることができる。As the core material 1, various difficult-to-process materials can be used.
例えば、Ｎを１２原子％以上含有するＡｊ−Ｔｉ合金は
難加工材であり、加工温度が１０日５°Ｃ未満では加工
不可能である。尚、Ｎ含有量が７０原子％以上になると
加工温度を１３００°Ｃに昇温しても延性が得られない
。For example, an Aj-Ti alloy containing 12 atomic percent or more of N is a difficult-to-process material, and cannot be processed at a processing temperature of less than 5° C. for 10 days. Note that when the N content is 70 at % or more, ductility cannot be obtained even if the processing temperature is raised to 1300°C.
前記外皮材２としては、低Ｃの炭素鋼やステンレス鋼等
の通常の鉄網材が一般的に使用される。As the outer skin material 2, a normal iron mesh material such as low C carbon steel or stainless steel is generally used.
安価で加工性が良好だからである。芯材１として高Ｎ含
有Ｔｉ合金を使用し、外皮材２としてＦｅ系外皮材を使
用した場合、Ｆｅ Ｔｉ２元合金の共晶点は１０８５
°Ｃであるため、前記断熱層３を使用することなく、複
合ビレットを１０８５°Ｃ以上に加熱すると、画材の接
触部に共晶反応が生じて溶融し、熱間押出が不可能にな
る。This is because it is inexpensive and has good workability. When a high N-containing Ti alloy is used as the core material 1 and a Fe-based skin material is used as the skin material 2, the eutectic point of the Fe-Ti binary alloy is 1085.
If the composite billet is heated to 1085°C or higher without using the heat insulating layer 3, a eutectic reaction will occur in the contact area of the art material and it will melt, making hot extrusion impossible.
前記断熱Ｎ３はアルミナ等のセラミック、黒鉛、ガラス
系潤滑剤など、芯材や外皮材に対して不活性で耐熱性に
冨んだ耐火材が使用される。断熱層を形成するには耐火
材の微粉末スラリーや溶媒に溶かしたものを芯材に塗布
乾燥すればよい。断熱層の厚みは通常０．２〜１耽程度
でよい。For the heat insulation N3, a refractory material that is inert to the core material and the outer skin material and has high heat resistance, such as ceramic such as alumina, graphite, or glass-based lubricant, is used. To form a heat insulating layer, a fine powder slurry of refractory material or a solution dissolved in a solvent may be applied to the core material and dried. The thickness of the heat insulating layer may normally be about 0.2 to 1 thick.
前記複合ビレットは、芯材１が延性を示し、塑性加工が
可能な温度に加熱された後、熱間押出に供される。押出
された押出材５は、第２図に示すように誘導加熱されつ
つストレッチされ、曲がりが矯正される。６は引張装置
（ストレッチャー）のチャック部であり、押出材の両端
部を把持している。その間には、誘導加熱用のインダク
ションヒータ７が付設されている。チャック部６は直接
加熱されないため、ステンレス鋼等の通常の鉄網材でよ
く、既存の引張装置を使用することができる。また、回
倒では押出材５は水平方向に支持されているが、垂直方
向に支持してもよい。The composite billet is heated to a temperature at which the core material 1 exhibits ductility and is capable of plastic working, and then is subjected to hot extrusion. As shown in FIG. 2, the extruded material 5 is stretched while being subjected to induction heating, and its bends are corrected. Reference numeral 6 denotes a chuck part of a tensioning device (stretcher), which grips both ends of the extruded material. An induction heater 7 for induction heating is provided between them. Since the chuck part 6 is not directly heated, it may be made of ordinary iron mesh material such as stainless steel, and an existing tensioning device can be used. Moreover, although the extruded material 5 is supported in the horizontal direction in the rotation, it may be supported in the vertical direction.
尚、電気炉等の加熱炉中にチャック部を設け、炉中で矯
正処理を行う場合、チャック部も必然的に芯材の塑性変
形可能な温度まで昇温させられる。In addition, when a chuck part is provided in a heating furnace such as an electric furnace and straightening treatment is performed in the furnace, the temperature of the chuck part is also inevitably raised to a temperature at which the core material can be plastically deformed.
かかる温度は１０００°Ｃ以上になることが多いため、
チャック部の材質は特殊な耐熱合金（ＴＺＭ ： Ｔ
ｉＺｒ−Ｍｏ合金）で形成しなければならなくなる。し
かし、この合金は、４００℃以上では気化するため、炉
中を不活性ガス雰囲気にしなければならない等の問題が
あり、処理に時間がかかる。Since such temperatures are often over 1000°C,
The material of the chuck part is a special heat-resistant alloy (TZM: T
iZr-Mo alloy). However, since this alloy vaporizes at temperatures above 400° C., there are problems such as the need to create an inert gas atmosphere in the furnace, which takes time to process.
ストレッチの際の加熱により、押出材は塑性変形可能に
なると共にその芯材は再結晶が進行し、ある程度、等粗
晶になり、二次加工性が向上する。By heating during stretching, the extruded material becomes plastically deformable, and the core material undergoes recrystallization, becoming homocoarse to some extent, and improving secondary workability.
等粗晶化を更に促進するには、ストレッチ後、除荷した
後、押出材をチャック部６に保持したまま、インダクシ
ョンヒータ７を継続使用して、再結晶化温度に保持すれ
ばよい。保持温度が１０００°Ｃ以上と高いと、押出材
を水平に支持した状態ではクリープ強度の低下によりた
わみによる曲がりが生じることがあるので、かかる場合
は押出材を垂直に支持するのが好ましい。もっとも、等
粗晶化熱処理はストレッチ時の熱処理とは別に行っても
よい。To further promote homocoarse crystallization, after stretching and unloading, the extruded material may be held in the chuck portion 6 and the induction heater 7 may be continuously used to maintain it at the recrystallization temperature. If the holding temperature is as high as 1000°C or higher, the extruded material may bend due to deflection due to a decrease in creep strength if it is supported horizontally, so in such a case, it is preferable to support the extruded material vertically. However, the homocoarse crystallization heat treatment may be performed separately from the heat treatment during stretching.
例えば、矯正後の押出材の複数本を加熱炉に寝かせて装
入し、所定の温度に保持すればよい。For example, a plurality of straightened extruded materials may be placed in a heating furnace and maintained at a predetermined temperature.
次に、具体的実施例を掲げる。Next, specific examples are listed.
（１）芯材として、Ｎ含有量が５０原子％のＡ／ Ｔ
ｉ合金を用い、外皮材には５ＵＳ３１６材を用いて複合
ビレットを製作した。芯材の外径は５ｏφであり、その
外周面にアルミナ層（厚み０．５＋ｎｍ）を形成し、外
径６７φの外皮材中に真空封入した。尚、比較のため、
アルミナ層の代りに、共晶反応防止用のＣｒメツキ（層
厚５０μ蒙）を芯材表面に被着した同寸法の複合ビレッ
トも製作した。(1) A/T with a N content of 50 at% as a core material
A composite billet was manufactured using i alloy and 5US316 material for the outer skin material. The outer diameter of the core material was 5oφ, and an alumina layer (thickness: 0.5+nm) was formed on the outer circumferential surface of the core material, and the core material was vacuum-sealed into an outer skin material having an outer diameter of 67φ. For comparison,
In place of the alumina layer, a composite billet of the same size was also produced in which a Cr plating (layer thickness: 50 μm) was applied to the surface of the core material to prevent the eutectic reaction.
（２） （１）の複合ビレットを１２００°Ｃに加熱
し、押出比５、歪速度１ｓ−１で押出した。押出状態は
実施例、比較例とも良好であった。押出材には両者とも
１ｍ当り３０〜５０閣の曲がりが発生した。(2) The composite billet of (1) was heated to 1200°C and extruded at an extrusion ratio of 5 and a strain rate of 1 s-1. The extrusion conditions were good in both Examples and Comparative Examples. In both cases, the extruded materials were bent at a rate of 30 to 50 degrees per meter.
（３）実施例、比較例の押出材を第２図の要領で引張装
置のチャック部（材質５ＵＳ３１６）に取付け、インダ
クションヒータを用いて３０分間で１０００″Ｃまで加
熱した後、１時間保持し、空冷後、断面を観察した。そ
の結果、実施例のビレット芯材にはクラックの発生は認
められなかったが、比較例ではクラックが発生していた
。(3) The extruded materials of Examples and Comparative Examples were attached to the chuck part (Material 5US316) of a tensioning device as shown in Fig. 2, heated to 1000''C for 30 minutes using an induction heater, and then held for 1 hour. After air cooling, the cross section was observed. As a result, no cracks were observed in the billet core material of the example, but cracks were found in the comparative example.
（４）次に、実施例の押出材を（３）と同様にして１０
００°Ｃに加熱した後、同温度で１．５時間ストレッチ
を行った。その結果、曲がりは１ｍ当り１ｍ以下となっ
た。(4) Next, the extruded material of the example was made in the same manner as in (3) to give 10
After heating to 00°C, stretching was performed at the same temperature for 1.5 hours. As a result, the bending was less than 1 m per 1 m.
（５）また、実施例の押出材を（４）と同様にしてスト
レッチした後、除荷し、９００°Ｃに降温後１０時間保
持し、冷却した。断面観察したところ、芯材の結晶粒は
等粗晶となっており、平均粒径は１０μ■であった。ま
た、曲がり量は１ｍ当り１■以下であった。(5) In addition, the extruded material of the example was stretched in the same manner as in (4), then unloaded, and after the temperature was lowered to 900°C, it was maintained for 10 hours and cooled. When the cross section was observed, the crystal grains of the core material were homocoarse crystals, and the average grain size was 10 μm. Further, the amount of bending was less than 1 inch per meter.
（６）また、実施例の押出材を（４）と同様にしてスト
レッチした後、除荷し、更に１０００°Ｃで１．５時間
保持したところ、芯材の結晶粒は平均粒径２０μ論の等
粗晶となっていた。また、曲がり量は１ｍ当り２ｍｍ程
度であった。尚、曲がり量の増加は、等粗晶化の高温保
持中に生じたたわみが原因と考えられる。(6) In addition, after stretching the extruded material of the example in the same manner as in (4), unloading it and further holding it at 1000°C for 1.5 hours, the average grain size of the core material was 20 μm. It was a coarse crystal. Moreover, the amount of bending was about 2 mm per 1 m. Incidentally, the increase in the amount of bending is considered to be caused by the deflection that occurred during high-temperature holding during isocoarse crystallization.
（発明の効果）
以上説明した通り、本発明の難加工材の熱間押出矯正方
法は、複合ビレットの芯材と外皮材との間に断熱層を介
在させたので、断熱層の断熱作用により難加工材の芯材
の温度が低下しにくくなり、外皮材を薄肉化することが
でき、歩留りが向上する。また、芯材と外皮材とが非接
触状態となるため、共晶反応による溶融を防止しうる。(Effects of the Invention) As explained above, in the hot extrusion straightening method of difficult-to-process materials of the present invention, since a heat insulating layer is interposed between the core material and the outer skin material of the composite billet, the heat insulating effect of the heat insulating layer is effective. The temperature of the core material, which is a difficult-to-process material, is less likely to drop, the outer skin material can be made thinner, and the yield is improved. Furthermore, since the core material and the outer skin material are in a non-contact state, melting due to a eutectic reaction can be prevented.
また、押出材の芯材と外皮材との間にも断熱層が介在す
ることになるため、該断熱層が熱的緩衝材として作用し
、外表面から急速加熱することができる。このため、誘
導加熱を行うことが可能となり、簡単な設備で矯正時の
加熱を短時間で行うことができ、熱エネルギーのロスも
少なくて済む。また、押出材の両端部は加熱されないの
で、該端部を把持するチャック部には高温耐熱性は必要
でないため、通常の引張装置を使用することができる。Further, since a heat insulating layer is also interposed between the core material and the outer skin material of the extruded material, the heat insulating layer acts as a thermal buffer material, and rapid heating can be performed from the outer surface. Therefore, induction heating can be performed, and heating during straightening can be performed in a short time with simple equipment, and loss of thermal energy can be reduced. Further, since both ends of the extruded material are not heated, the chuck portion that grips the ends does not need to be resistant to high temperatures, so a normal tensioning device can be used.
第１図は本発明に係る複合ビレットの断面図、第２図は
押出材の曲がり矯正要領を示す断面説明図、第３図は従
来の複合ビレットの断面図を示す。
１・・・難加工材、２・・・外皮材、３・・・断熱層、
５・・・押出材、
７・・・インダクションヒータ。FIG. 1 is a cross-sectional view of a composite billet according to the present invention, FIG. 2 is a cross-sectional explanatory view showing the procedure for straightening the bending of an extruded material, and FIG. 3 is a cross-sectional view of a conventional composite billet. 1... Difficult-to-process material, 2... Outer skin material, 3... Heat insulation layer,
5... Extruded material, 7... Induction heater.
Claims (1)
して前記難加工材よりも加工性に優れた外皮材で被覆し
た複合ビレットを加熱して熱間押出した後、押出材の両
端部を把持し、その間を誘導加熱すると共に引張り、押
出材の曲がりを矯正することを特徴とする難加工材の熱
間押出矯正方法。(1) After heating and hot extruding a composite billet in which the outside of a difficult-to-process material that is difficult to process at room temperature is covered with a skin material that has better workability than the difficult-to-process material through a heat insulating layer, A hot extrusion straightening method for a difficult-to-process material, which comprises gripping both ends and applying induction heating and pulling between the ends to straighten the bend of the extruded material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26152690A JPH04138816A (en) | 1990-09-28 | 1990-09-28 | Method for correcting hard-to-work material by hot extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26152690A JPH04138816A (en) | 1990-09-28 | 1990-09-28 | Method for correcting hard-to-work material by hot extrusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04138816A true JPH04138816A (en) | 1992-05-13 |
Family
ID=17363125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26152690A Pending JPH04138816A (en) | 1990-09-28 | 1990-09-28 | Method for correcting hard-to-work material by hot extrusion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04138816A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5361477A (en) * | 1994-03-10 | 1994-11-08 | The United States Of America As Represented By The Secretary Of The Air Force | Controlled dwell extrusion of difficult-to-work alloys |
-
1990
- 1990-09-28 JP JP26152690A patent/JPH04138816A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5361477A (en) * | 1994-03-10 | 1994-11-08 | The United States Of America As Represented By The Secretary Of The Air Force | Controlled dwell extrusion of difficult-to-work alloys |
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