JPH07214219A - Method for heating billet of aluminum or aluminum alloy - Google Patents
Method for heating billet of aluminum or aluminum alloyInfo
- Publication number
- JPH07214219A JPH07214219A JP2478194A JP2478194A JPH07214219A JP H07214219 A JPH07214219 A JP H07214219A JP 2478194 A JP2478194 A JP 2478194A JP 2478194 A JP2478194 A JP 2478194A JP H07214219 A JPH07214219 A JP H07214219A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heating
- billet
- aluminum
- outer peripheral
- 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.)
- Granted
Links
Landscapes
- Extrusion Of Metal (AREA)
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アルミニウムまたはア
ルミニウム合金の押出成形に供するビレットの加熱方法
に関し、さらに詳しくは該ビレットを交流誘導電力型加
熱器により加熱する誘導加熱方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating a billet used for extrusion molding of aluminum or an aluminum alloy, and more particularly to an induction heating method for heating the billet with an AC induction power type heater.
【０００２】[0002]
【従来の技術】アルミニウムまたはアルミニウム合金の
押出成形に供する素材ビレットを加熱する方法にはガス
焚きの直火炉による加熱方法と、交流誘導電力型加熱器
を使用して素材ビレット自体に渦電流を発生させ、加熱
する誘導加熱方法等があるが、現在は被加熱体（素材ビ
レット）の加熱速度の迅速性、高精度なテーパー加熱が
可能、設備の簡素化などの利点を有する誘導加熱器によ
る方法がその主流を占めている。しかしながら誘導加熱
器による方法においては、素材ビレットの外周表面と内
部中心部における温度に差を生じ、外周表面は内部中心
部より高温となるという宿命がある。2. Description of the Related Art As a method for heating a material billet used for extrusion molding of aluminum or aluminum alloy, a method of heating by a gas-fired direct furnace and an eddy current is generated in the material billet itself by using an AC induction power type heater. There is an induction heating method that heats and heats the material. Currently, the induction heating method has advantages such as rapid heating speed of the object to be heated (material billet), highly accurate taper heating, and simplification of equipment. Is the mainstream. However, in the method using the induction heater, there is a fate that a temperature difference occurs between the outer peripheral surface of the material billet and the inner central portion, and the outer peripheral surface becomes higher in temperature than the inner central portion.
【０００３】この現象の発生機構を図２および図３によ
り説明する。図２の（ａ）において交流電源１に接続し
たコイル２に図２の（ｂ）に示すように交流電流４を通
じれば素材ビレット３の内部に渦電流５が発生し、これ
により素材は加熱される。しかしながら、円柱状ビレッ
トの断面における誘導渦電流の分布は図３に示すように
なる。図３の横軸は表面から中心部への距離であり、縦
軸は電流密度である。すなわち、渦電流は素材の表面に
流れ易い性質を有するために素材の表面は電流密度が内
部中心部より高くなり、発熱量が多く、温度は上昇す
る。従って目標とする温度まで連続して誘導加熱を継続
する従来の素材ビレット加熱方法では外周表面は内部中
心部より高温となり、温度分布を均一にすることは理論
的に不可能であり、温度差をごく小さく押さえることは
むずかしかった。The mechanism of occurrence of this phenomenon will be described with reference to FIGS. When an alternating current 4 is applied to the coil 2 connected to the alternating current power source 1 in FIG. 2 (a) as shown in FIG. 2 (b), an eddy current 5 is generated inside the material billet 3, which heats the material. To be done. However, the distribution of the induced eddy current in the cross section of the cylindrical billet is as shown in FIG. The horizontal axis of FIG. 3 is the distance from the surface to the central portion, and the vertical axis is the current density. That is, since the eddy current has a property of easily flowing to the surface of the material, the current density on the surface of the material becomes higher than that of the inner central portion, the amount of heat generation is large, and the temperature rises. Therefore, according to the conventional material billet heating method in which induction heating is continuously continued up to the target temperature, the outer peripheral surface becomes hotter than the inner central portion, and it is theoretically impossible to make the temperature distribution uniform, and the temperature difference is It was difficult to keep it very small.
【０００４】素材ビレットの温度を測定する温度検出点
は前端面上の外周表面より中心部に向って数１０ｍｍ内
側に位置し、ここに熱電対の熱接点を取付けてビレット
の温度が測定される。すなわち上述設定箇所の温度を素
材ビレットの温度と判断して加熱を行っているが、素材
の外周表面と内部中心部の温度差が大きい程、温度検出
点と外周表面の真の温度との差は大きくなり、中心部の
温度が低い程、外周表面の真の温度は検出温度より高く
なる。外周表面の温度が高温となり、特に一定の範囲を
越えた場合には外周表面を形成する表面相中の低融点晶
出物が局部的に溶融して押出成形の際に機械特性を劣化
させる割れ、亀裂発生の原因となり、さらに後加工であ
る電解着色を行った場合にストリークの発生など不良品
発生率の上昇につながる。従来法によればストリークの
発生に起因する不良品発生率は６０％にも達している。The temperature detecting point for measuring the temperature of the material billet is located inside the outer peripheral surface on the front end face by several tens of mm toward the center, and the temperature of the billet is measured by attaching a thermal contact of a thermocouple thereto. . That is, the temperature at the above-mentioned setting location is judged as the temperature of the material billet to perform heating, but the greater the temperature difference between the outer peripheral surface of the material and the inner central portion, the greater the difference between the temperature detection point and the true temperature of the outer peripheral surface. Becomes larger, and the lower the temperature of the central portion, the higher the true temperature of the outer peripheral surface becomes than the detected temperature. When the temperature of the outer peripheral surface becomes high, especially when it exceeds a certain range, the low melting point crystallized substances in the surface phase forming the outer peripheral surface locally melt and cracks that deteriorate the mechanical properties during extrusion molding. In addition, it causes cracks and further increases the defective product occurrence rate such as streaks when electrolytically coloring which is a post-process. According to the conventional method, the defective product occurrence rate due to the occurrence of streaks reaches 60%.
【０００５】[0005]
【発明が解決しようとする課題】本発明はアルミニウム
またはアルミニウム合金の押出成形に供する素材ビレッ
トの誘導加熱工程において該素材ビレットの外周表面と
内部中心部との温度差を極力小さくすることにより押出
成形製品の機械特性の向上、並びにバラツキの減少また
は皆無、さらに電解着色工程におけるストリークの防止
ができる誘電加熱方法を開発することを目的とする。DISCLOSURE OF THE INVENTION According to the present invention, extrusion molding is carried out by minimizing the temperature difference between the outer peripheral surface of the material billet and the inner center in the induction heating step of the material billet used for extrusion molding of aluminum or aluminum alloy. It is an object of the present invention to develop a dielectric heating method capable of improving mechanical properties of products, reducing or eliminating variations, and preventing streaks in an electrolytic coloring process.
【０００６】[0006]
【課題を解決するための手段】本発明者等はアルミニウ
ムまたはアルミニウム合金の押出成形に供する素材ビレ
ットを常温から目標とする温度まで連続して誘導加熱す
る従来の加熱方法に代えて、加熱を段階的に行うことに
より該素材ビレットの外周表面と内部中心部との温度差
を極力小さくすることができると考えて鋭意研究の結果
本発明を達成することができた。すなわち常温から目標
とする温度の途中の温度まで加熱した後、昇温のための
加熱を一旦中断して、一定時間保持した後、再び昇温の
ための加熱を継続し、目標温度まで昇温する。さらに以
上の操作を数回に分けて段階的に継続して、目標温度ま
で昇温する。かくして得られた素材ビレットの外周表面
と内部中心部の温度差は極めて縮小するため、得られた
押出成形製品は従来の工程で得られた製品に比べて機械
特性の優れた、バラツキの少いかつ、電解着色工程にお
けるストリークの発生しない製品である。The present inventors have replaced the conventional heating method of continuously inductively heating a material billet used for extrusion molding of aluminum or an aluminum alloy from room temperature to a target temperature with heating in stages. It was thought that the temperature difference between the outer peripheral surface of the raw material billet and the inner central portion can be minimized by carrying out the heat treatment, and as a result of earnest research, the present invention could be achieved. That is, after heating from room temperature to a temperature in the middle of the target temperature, the heating for raising the temperature is temporarily interrupted, after holding for a certain time, the heating for raising the temperature is continued again, and the temperature is raised to the target temperature. To do. Further, the above operation is divided into several times and continued stepwise to raise the temperature to the target temperature. Since the temperature difference between the outer peripheral surface and the inner center of the material billet thus obtained is extremely reduced, the extruded product obtained has superior mechanical properties and less variation than the product obtained by the conventional process. The product does not cause streaks in the electrolytic coloring process.
【０００７】本発明を図１および図４によりさらに詳細
に説明する。図４の（Ａ）は従来の加熱方法、図４の
（Ｂ）は本発明による加熱方法を示す図である。縦軸は
温度検出点における温度測定値、横軸は加熱経過時間で
ある。温度検出点はビレットの前端面上外周より数１０
ｍｍ内側に位置し、熱電対の熱接点を取付けてある。The present invention will be described in more detail with reference to FIGS. 1 and 4. 4A is a diagram showing a conventional heating method, and FIG. 4B is a diagram showing a heating method according to the present invention. The vertical axis represents the measured temperature value at the temperature detection point, and the horizontal axis represents the elapsed heating time. The temperature detection point is several tens from the outer circumference on the front end face of the billet.
Located inside mm, the thermocouple thermal contacts are attached.
【０００８】従来の加熱方法においては、図４の（Ａ）
に示すように素材ビレットは加熱コイルを流れる交流電
流により連続的に誘導加熱されて、目標温度（ａ）まで
到達する。一方本発明による加熱方法においては、加熱
開始後温度が（ｂ）に達した時点で昇温のための加熱を
一旦中断し、一定時間保持した後、再び昇温のための加
熱を行ない、温度が（ｃ）に達した時点で再び昇温のた
めの加熱を中断し、一定時間保持した後、再び昇温のた
めの加熱を行ない、目標温度（ａ）まで加温する。この
操作をさらに多数の段階に分けて階段状に行うことが望
ましい場合もある。In the conventional heating method, FIG.
As shown in, the material billet is continuously induction-heated by the alternating current flowing through the heating coil and reaches the target temperature (a). On the other hand, in the heating method according to the present invention, when the temperature reaches (b) after the start of heating, the heating for raising the temperature is temporarily stopped, and after holding for a certain period of time, the heating for raising the temperature is performed again. When the temperature reaches (c), the heating for raising the temperature is interrupted again, and after holding for a certain period of time, the heating for raising the temperature is performed again and the temperature is raised to the target temperature (a). In some cases, it may be desirable to perform this operation in a stepwise manner in more steps.
【０００９】従来の加熱方法による加熱ビレットの断面
における温度分布を図１の曲線（I）で表わし、本発明
の加熱方法による温度分布を曲線（II）で表わす。図中
（ａ）点は温度検出点における測定値すなわち目標温度
である。従来の加熱方法による素材ビレット断面の温度
勾配は曲線（I ）に示すように、本発明による加熱方法
における曲線IIより急であり、前者の外周表面温度
（ｄ）は後者の外周表面温度（ｅ）より高いことがわか
る。すなわち本発明の加熱方法における素材ビレット内
の温度分布は従来の加熱方法によるものに比較して素材
ビレット内の温度分布が均一となり、外周表面の温度は
目標温度に接近していることがわかる。The temperature distribution in the cross section of the heating billet by the conventional heating method is represented by the curve (I) in FIG. 1, and the temperature distribution by the heating method of the present invention is represented by the curve (II). Point (a) in the figure is the measured value at the temperature detection point, that is, the target temperature. As shown by the curve (I), the temperature gradient of the cross section of the material billet by the conventional heating method is steeper than the curve II by the heating method according to the present invention, and the outer peripheral surface temperature (d) of the former is the outer peripheral surface temperature (e) of the latter. ) It turns out that it is higher. That is, it can be seen that the temperature distribution in the material billet in the heating method of the present invention is more uniform than that in the conventional heating method, and the temperature of the outer peripheral surface approaches the target temperature.
【００１０】外周表面温度が一定の範囲を越えると外周
表面層中に存在する低融点晶出物が局部的に溶融して押
出成形の際に割れ、亀裂発生の原因となり、さらに後加
工である電解着色を行った場合にストリークの発生など
不良品発生率の上昇につながる。従って本発明による加
熱方法の開発により、アルミニウムまたはアルミニウム
合金の押出成形工程において発生する割れ、亀裂が防止
でき、さらに電解着色工程におけるストリークの発生が
皆無となったために、押出成形製品の機械特性は向上
し、かつ製品不良は極端に低下した。When the outer peripheral surface temperature exceeds a certain range, the low melting point crystallized substances present in the outer peripheral surface layer are locally melted, causing cracks and cracks during extrusion molding, and further post-processing. If electrolytic coloring is performed, it leads to an increase in defective product occurrence rate such as streak. Therefore, by the development of the heating method according to the present invention, the cracks and cracks that occur in the extrusion molding process of aluminum or aluminum alloy can be prevented, and the occurrence of streaks in the electrolytic coloring process is eliminated, the mechanical properties of the extrusion molded product are It was improved and the product defects were extremely reduced.
【００１１】[0011]
【作用】誘導加熱器の発熱の原理は構成する加熱コイル
に交流電流を通じて磁界を発生させ、磁界内に置かれた
被加熱物である素材ビレットに誘導渦電流を発生させて
加熱することである。誘導渦電流は素材ビレットの外周
表面に集中する性質があるために、素材ビレットの外周
表面では電流密度は高く、中心部に行く程低くなり、外
周表面の温度は最も高く、内部中心部に行くに従って低
くなる。一方被加熱物である素材ビレットの熱伝導速度
は加熱速度より遅いために、連続的に加熱を続ければ、
外周表面の温度と内部中心部の温度との差は大となり、
素材ビレット内の温度分布は不均一となる。[Operation] The principle of heat generation of the induction heater is to generate a magnetic field by passing an alternating current in the heating coil that constitutes the induction heater, and to generate an induction eddy current in the material billet which is the object to be heated placed in the magnetic field to heat it. . Since the induced eddy current has the property of concentrating on the outer peripheral surface of the material billet, the current density is high on the outer peripheral surface of the material billet and decreases toward the center, and the temperature of the outer peripheral surface is highest and goes to the inner center. The lower it gets. On the other hand, the heat conduction speed of the material billet, which is the object to be heated, is slower than the heating speed, so if heating is continued,
The difference between the temperature of the outer peripheral surface and the temperature of the inner center becomes large,
The temperature distribution in the material billet becomes uneven.
【００１２】従って素材ビレットの温度分布を均一化す
るためには目標とする温度に到達する迄目標温度以下の
温度に一定時間保持して、熱伝導により温度の均一化を
計り、さらに加熱、保持を繰返して目標温度まで到達さ
せれば良いことになる。Therefore, in order to make the temperature distribution of the material billet uniform, the temperature is kept below the target temperature for a certain time until the target temperature is reached, the temperature is made uniform by heat conduction, and further heating and holding are performed. It is sufficient to repeat the above to reach the target temperature.
【００１３】一方ビレットの外周表面温度が押出成形に
最適な温度である目標温度より高くなり、特に相変態点
を越えた場合には外周表面層を形成する固相の中で液層
に変態する相を形成している低融点晶出物等が局部的に
溶融を始めるために、該ビレットを押出成形して、電解
着色を行った場合には製品の割れ、亀裂などの機械的特
性の劣化およびバラツキ、さらに電解着色時にストリー
クが発生する。本発明の加熱方法によればこのような現
象による特性の劣化を防ぐことができる。On the other hand, when the outer peripheral surface temperature of the billet becomes higher than the target temperature which is the optimum temperature for extrusion molding, and especially when it exceeds the phase transformation point, it is transformed into a liquid layer in the solid phase forming the outer peripheral surface layer. In order to locally start melting of the low-melting-point crystallized substances that form the phase, the billet is extruded and electrolytically colored, the mechanical properties such as cracks and cracks of the product deteriorate. And variations, and streaks occur during electrolytic coloring. According to the heating method of the present invention, it is possible to prevent deterioration of characteristics due to such a phenomenon.
【００１４】[0014]
【実施例】本発明によるアルミニウムまたはアルミニウ
ム合金の誘導加熱方法およびその効果を従来の方法と比
較するために、Ｃｕ ０．３０％、Ｍｇ １．００％、
Ｓｉ ０．６０％、Ｆｅ ０．２０％、Ｃｒ ０．１０
％、残Ａｌより成る径３０７ｍｍ、長さ１２００ｍｍの
Ａ６０６１ビレットを試料として試験を行った。試料の
前端面より３０ｍｍ後方の径方向に中心まで達する閉穴
をあけて加熱器に据付け、前端面より３０ｍｍ後方の外
周表面部、閉穴内試料中心部、ならびに前端面外周より
中心に向かって５０ｍｍの位置に設置されている目標温
度検出点の３点に熱電対の熱接点を取付け、加熱器に交
流電流を通じて試料を加熱昇温し、各部分の温度を測定
した。 （i ）従来の誘導加熱方法 加熱器に交流電流（３４０Ｖｏｌｔ、８００Ａ、６０Ｈ
ｚ）を連続的に通じて一気に目標温度５００℃まで上昇
して各々の部分の温度を測定した。 （ii）本発明による誘導加熱方法 従来法と全く同一の交流電流を下記３段階に階段状に通
じた。EXAMPLE In order to compare the induction heating method of aluminum or aluminum alloy according to the present invention and its effect with the conventional method, Cu 0.30%, Mg 1.00%,
Si 0.60%, Fe 0.20%, Cr 0.10
%, And an A6061 billet having a diameter of 307 mm and a length of 1200 mm made of residual Al was used as a sample for the test. A closed hole that reaches the center in the radial direction 30 mm behind the front end face of the sample is opened and installed in the heater. The outer peripheral surface part 30 mm behind the front end face, the sample center part in the closed hole, and 50 mm toward the center from the front end face outer periphery The heat contacts of the thermocouples were attached to the three target temperature detection points installed at the position, and the sample was heated and heated by passing an alternating current through the heater, and the temperature of each part was measured. (I) Conventional induction heating method An alternating current (340Volt, 800A, 60H) was applied to the heater.
z) was continuously passed through and the target temperature was raised to 500 ° C at once, and the temperature of each part was measured. (Ii) Induction heating method according to the present invention The same alternating current as in the conventional method was passed stepwise in the following three steps.
【００１５】第１段 常温から４２０℃まで４分間通じ
て後、電流を切り３分間保持した。First stage: After passing from room temperature to 420 ° C. for 4 minutes, the current was cut off and kept for 3 minutes.
【００１６】第２段 第１段に引き続き４２０℃から４
６０℃まで２５秒間通電して後、電流を切り３分間保持
した。2nd stage Continuing from 1st stage, from 420 ° C to 4
After energizing to 60 ° C. for 25 seconds, the current was cut off and held for 3 minutes.
【００１７】第３段 第２段に引き続き４６０℃から５
００℃まで２５秒間通じて目標温度まで昇温した。From the third stage to the second stage, from 460 ° C. to 5
The temperature was raised to 00 ° C. for 25 seconds to reach the target temperature.
【００１８】上述３点における測定温度を図１上に対比
して、表示する。The measured temperatures at the above-mentioned three points are displayed in comparison with those in FIG.
【００１９】 ａ点：加熱器に設置された目標温度５００℃ ｄ点：従来法による試料の外周表面の温度５３５℃ ｅ点：本発明法による試料の外周表面の温度５０８℃ ｆ点：従来法による試料の内部中心部の温度３４０℃ ｇ点：本発明法による試料の内部中心部の温度４７５℃ いずれの加熱方法においても試料の外周表面は目標温度
より上昇しているが、その差は従来法によるより本発明
法による場合のほうが小さいことがわかる。Point a: target temperature 500 ° C. installed in the heater d point: temperature of the outer peripheral surface of the sample by the conventional method 535 ° C. point e: temperature of the outer peripheral surface of the sample by the method of the present invention 508 ° C. point f: the conventional method According to the method of the present invention, the temperature of the inner central portion of the sample is 340 ° C. g point: the temperature of the inner central portion of the sample is 475 ° C. In any heating method, the outer peripheral surface of the sample is higher than the target temperature. It can be seen that the method of the present invention is smaller than the method.
【００２０】本発明による誘導加熱方法では従来の加熱
方法に比べて試料の外周表面温度を目標温度（加熱管理
温度）付近まで近づけることができたために、外周表面
層に発生する一部溶融が無くなり、その結果割れ、亀裂
および電解着色の際に発生しがちなストリ−クが無くな
ったと考えられる。In the induction heating method according to the present invention, the outer peripheral surface temperature of the sample can be brought closer to the target temperature (heating control temperature) as compared with the conventional heating method, so that partial melting generated in the outer peripheral surface layer is eliminated. As a result, it is considered that cracks, cracks, and strikes that tend to occur during electrolytic coloring have disappeared.
【００２１】[0021]
【発明の効果】本発明はアルミニウムまたはアルミニウ
ム合金の押出成形に供する素材ビレットを一気に目標温
度まで加熱する従来の誘導加熱方法を加熱、保持を段階
状に繰返しながら目標温度まで加熱する誘導加熱方法に
代えることにより、押出成形における割れ、亀裂に起因
する機械特性の劣化のない、かつ電解着色工程で発生し
ていたストリークによる不良品の発生のない押出成形製
品の生産を可能とした。INDUSTRIAL APPLICABILITY The present invention provides an induction heating method of heating a material billet used for extrusion molding of aluminum or an aluminum alloy to a target temperature all at once by heating the billet to a target temperature while repeating heating and holding stepwise. By substituting it, it is possible to produce an extrusion-molded product without cracks in extrusion molding, deterioration of mechanical properties due to cracks, and generation of defective products due to streaks generated in the electrolytic coloring step.
【００２２】従って本発明はアルミニウムまたはアルミ
ニウム合金の押出成形製品の機械特性および歩留の向上
に大いに貢献するであろう。Therefore, the present invention will greatly contribute to the improvement of the mechanical properties and the yield of the extruded product of aluminum or aluminum alloy.
【図１】従来の加熱方法による場合と対比して本発明の
加熱方法により加熱した円柱状ビレット断面における温
度分布を示した図である。（I ）は従来法による温度分
布曲線、（II）は本発明法による温度分布曲線である。FIG. 1 is a diagram showing a temperature distribution in a cross section of a cylindrical billet heated by a heating method of the present invention as compared with a case of a conventional heating method. (I) is a temperature distribution curve according to the conventional method, and (II) is a temperature distribution curve according to the method of the present invention.
【図２】交流誘導加熱器における加熱原理の説明図であ
る。FIG. 2 is an explanatory diagram of a heating principle in an AC induction heater.
【図３】円柱状ビレットの断面図における誘導渦電流分
布図である。横軸は表面から中心部への距離、縦軸は電
流密度。FIG. 3 is an induced eddy current distribution diagram in a cross-sectional view of a cylindrical billet. The horizontal axis is the distance from the surface to the center, and the vertical axis is the current density.
【図４】（Ａ）は従来の交流誘導加熱方法の説明図であ
る。横軸は加熱経過時間、縦軸は目標温度まで到達する
過程の温度。（Ｂ）は本発明による交流誘導加熱方法の
説明図。横軸は加熱方法および経過時間、縦軸は目標温
度まで到達する各段階における温度。FIG. 4A is an explanatory diagram of a conventional AC induction heating method. The horizontal axis is the elapsed heating time, and the vertical axis is the temperature in the process of reaching the target temperature. (B) is explanatory drawing of the alternating current induction heating method by this invention. The horizontal axis is the heating method and the elapsed time, and the vertical axis is the temperature at each stage to reach the target temperature.
１ 交流電源 ２ 誘導加熱コイル ３ 素材ビレット ４ 誘導加熱コイルを流れる電流の方向 ５ 素材に発生した渦電流の方向 ａ 目標温度 ｂ 第１段到達温度 ｃ 第２段到達温度 ｄ 従来の加熱方法における素材ビレットの外周表面
の温度 ｅ 本発明の加熱方法における外周表面の温度 ｆ 従来の加熱方法における試料中心部の温度 ｇ 本発明の加熱方法における試料中心部の温度1 AC power supply 2 Induction heating coil 3 Material billet 4 Direction of current flowing in induction heating coil 5 Direction of eddy current generated in material a Target temperature b First stage temperature c Second stage temperature d Material in conventional heating method Temperature of outer peripheral surface of billet e Temperature of outer peripheral surface in heating method of the present invention f Temperature of sample central portion in conventional heating method g Temperature of sample central portion in heating method of the present invention
Claims (1)
押出成形に供する素材ビレットを誘導加熱方式で加熱す
る際に、該ビレットを目標とする押出成形温度より低い
温度に上昇させた後、昇温のための加熱を中止して一定
時間保持し、再度加熱を行ない、これを少なくとも１回
以上繰り返して加熱、保持を階段状に繰り返すことによ
り順次昇温しながら、目標温度まで昇温させることを特
徴とするアルミニウムまたはアルミニウム合金ビレット
の加熱方法。1. When heating a material billet used for extrusion molding of aluminum or an aluminum alloy by an induction heating method, after raising the billet to a temperature lower than the target extrusion molding temperature, heating for raising the temperature. The aluminum is characterized in that the temperature is raised to a target temperature while the temperature is sequentially raised by repeating the heating and the holding by repeating the heating and holding at least once or more by repeating the heating and holding for a certain time. Or a method of heating an aluminum alloy billet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6024781A JP2658011B2 (en) | 1994-01-27 | 1994-01-27 | Electrolytic coloring method of aluminum or aluminum alloy material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6024781A JP2658011B2 (en) | 1994-01-27 | 1994-01-27 | Electrolytic coloring method of aluminum or aluminum alloy material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07214219A true JPH07214219A (en) | 1995-08-15 |
| JP2658011B2 JP2658011B2 (en) | 1997-09-30 |
Family
ID=12147734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6024781A Expired - Fee Related JP2658011B2 (en) | 1994-01-27 | 1994-01-27 | Electrolytic coloring method of aluminum or aluminum alloy material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2658011B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008266729A (en) * | 2007-04-20 | 2008-11-06 | Honda Motor Co Ltd | Method for heating steel-made workpiece |
| JP2010064924A (en) * | 2008-09-11 | 2010-03-25 | Toshiba Corp | Porous material and method for producing porous material |
| EP2324829A1 (en) | 1993-01-28 | 2011-05-25 | Boston Scientific Limited | Therapeutic inhibitors of vascular smooth muscle cells |
| JP2012139693A (en) * | 2010-12-28 | 2012-07-26 | Sumitomo Metal Ind Ltd | Method of manufacturing hot extrusion tube |
-
1994
- 1994-01-27 JP JP6024781A patent/JP2658011B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2324829A1 (en) | 1993-01-28 | 2011-05-25 | Boston Scientific Limited | Therapeutic inhibitors of vascular smooth muscle cells |
| JP2008266729A (en) * | 2007-04-20 | 2008-11-06 | Honda Motor Co Ltd | Method for heating steel-made workpiece |
| JP2010064924A (en) * | 2008-09-11 | 2010-03-25 | Toshiba Corp | Porous material and method for producing porous material |
| JP2012139693A (en) * | 2010-12-28 | 2012-07-26 | Sumitomo Metal Ind Ltd | Method of manufacturing hot extrusion tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2658011B2 (en) | 1997-09-30 |
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