JP2004223524A - Extrusion device for aluminum bar material - Google Patents

Extrusion device for aluminum bar material Download PDF

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Publication number
JP2004223524A
JP2004223524A JP2003011127A JP2003011127A JP2004223524A JP 2004223524 A JP2004223524 A JP 2004223524A JP 2003011127 A JP2003011127 A JP 2003011127A JP 2003011127 A JP2003011127 A JP 2003011127A JP 2004223524 A JP2004223524 A JP 2004223524A
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JP
Japan
Prior art keywords
die
aluminum bar
bar material
die ring
ring
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Pending
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JP2003011127A
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Japanese (ja)
Inventor
Eki Fujiwara
恵喜 藤原
Takashi Asano
敬 浅野
Hiroaki Ukaji
浩章 宇梶
Hiroyuki Yamazaki
弘之 山崎
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Tostem Corp
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Tostem Corp
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Priority to JP2003011127A priority Critical patent/JP2004223524A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To handily and surely eliminate the generation of extruding failures such as variations of wall thickness and shape between a beginning step and a later step of an extrusion and torsion in the longitudinal direction in an aluminum bar material. <P>SOLUTION: By arranging a concavo-convex portion 12 composed of a plurality of parallel grooves 13 and projections 14 on the outer peripheral surface so as to make the outer peripheral surface of a die ring 1, which engages and contains a die and a bucker to form the aluminum bar material, a knurled corrugated-shape in the peripheral direction, and by mounting and supporting the die slide in a line contacting condition of the projection portions 14, the die ring 1 heated at a high temperature prevents heat conduction to an unheated die slide and heat release therefrom. By this way, the die temperature distribution is uniformized as much as possible to dissolve extruding failures of the aluminum bar material. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は建材等の各種分野で使用されるアルミバー材を押出加工するアルミバー材の押出加工装置に関する。
【0002】
【従来の技術】
押出加工装置によってアルミバー材(アルミ押出形材といってもよい)の押出加工を継続した場合,押出加工の初期とその後のアルミバー材に肉厚や形状のバラツキ,長手方向の捻れ等の押出不良が生じやすいこと,その原因は,アルミを押出加工する高温加熱したダイスが鋼製であることによって経時的に放熱するため,その中心部と外周部の温度分布の均一性が損われて,ダイスの熱収縮が不均一となる結果,ダイスの中心部に形成したアルミバー材の形状を定めるダイス孔に,これを狭隘化するような変形が生じることによるものと見られることが知られており,その解決のために,例えば特許文献1は,ダイス及びその背面のバッカーを嵌合収容するダイリングの内周に断熱材を嵌挿装着し又は該ダイリングの背面側を開口するように形成した環状溝に断熱材を埋込充填して,該断熱材の断熱作用によってダイスの温度低下を防止し,該ダイス温度分布の均一性を維持するようにしたものとされ,また特許文献2は,ダイスの放熱によってその中心側と外周側の温度分布の均一性が損われることを不可避であるとして,予めダイスの高温加熱をその中心側でアルミビレット温度より高く,外周側でこれより相対的に低くした高低の温度分布となるようにして,外周部の放熱が進行することによって温度分布の均一性を確保して,上記ダイスの熱収縮を抑制するようにしたものとされている。
【0003】
【特許文献1】
特開平4−228223号(2頁〜3頁,図1及び図2)
【特許文献2】
特開2001−259731(2頁〜3頁,図4及び図5)
【0004】
【発明が解決しようとする課題】
しかし乍ら上記特許文献1はダイリングに断熱材を使用するために,断熱材の装着作業が煩雑化し易く,また断熱材はダイスと同様に高温加熱されるダイリングに装着することによって早期の劣化が予想されるため,断熱材交換やそのための管理が煩雑となり,また加熱,昇温を遅くしてしまう。特許文献2はダイスの加熱を温度分布を高低に差を付けた状態に行なうために,加熱作業や温度管理が煩雑となり,いずれも押出加工の作業性を損なうという問題点が残されている。
【0005】
本発明はかかる事情に鑑みてなされたもので,その解決課題とするところは,押出加工に際して特段の作業や管理を必要とすることなく,可及的簡易且つ確実に押出不良を解消し得るようにしたアルミバー材の押出加工装置を提供するにある。
【0006】
【課題を解決するための手段】
上記課題に添って鋭意検討した結果,本発明者らは,上記ダイス温度分布の均一性が損なわれるのは,ダイスの経時的な放熱というより,ダイス及びバッカーを嵌合収容してこれらとともに高温加熱されて押出加工装置に装着されるダイリングが,これを下支え支持するダイスライド,背面で受止めするボルスター等と接触するところ,これらは加熱されることなく押出加工装置に設置される非加熱部材であることから,上記接触によって高温加熱されたダイリングが急速に冷却されるように伝導放熱を行なうとともに該ダイリングの冷却によってダイスにも同様な伝導放熱が生じることに主な原因があること,押出加工装置において,一般に2×10N程度というように大きな加圧力を受けるのはダイス,バッカー,ボルスター等であり,ダイス,バッカーの外周に位置するダイリングはビレットとコンテナの摩擦力経由の加圧力の一部とコンテナシール力を負担する程度であり,その実質的な重量,即ち熱容量と基本形状を維持できればその外周面,背面等に加工を施しまたこれと接触する非加熱部材に同様に加工を施すことが可能であること,このとき外周面,背面等乃至非加熱部材に施す加工を,例えば溝,突起等による凹凸部とすれば,ダイリングの接触面積を減少するとともに凹部に空気の断熱層が形成されてダイリングの機能を損うことなくその上記伝導放熱を抑制し,アルミバー材の押出不良を特段の作業を必要とせずに簡易且つ確実に防止し得るとの知見を得た。
【0007】
本発明はかかる知見に基づいてなされたものであって,即ち本発明は,ダイリングの外周面又は背面と非加熱部材との接触面にその接触面積を可及的に減少する溝,突起等の凹凸部を介設し上記ダイリングと被加熱部材との接触によるダイリングの伝導放熱を可及的に抑制してなることを特徴とするアルミバー材の押出加工装置とし,これを発明の要旨として上記課題解決の手段としたものである。
【0008】
本発明の凹凸部配置の好ましい実施形態として,伝導放熱を効果的に抑制するために,ダイリングの非加熱部材に対する接触面積を可及的に小さくするようにダイリングの外周面又は背面に該接触を線接触や点接触とする凹凸部を配置すること,その際ダイリングの実質的な重量を維持するには,接触面積を外周面でその面積の10%程度乃至それ以下(例えば7〜8%)とし,背面でその面積の50%程度乃至それ以下(例えば30〜40%)とすること,上記凹部による空隙に形成される空気断熱層がその断熱性を可及的に発揮し得るようにするため,該空隙において空気対流が生じないように凹凸部の深さを可及的に浅く設定すること,その際空気対流の可能性を略完全に解消し得るようにその深さを2〜3mm程度とすることが挙げられ,このようにすることによってそれぞれ良好な結果を得られる。
【0009】
【発明の実施の形態】
以下図面の例に従って本発明を更に具体的に説明すれば,符号1はダイリング,2は該ダイリング1の円形透孔11に嵌合装着され中心部にアルミバー材7成形用のダイス孔21を備えたダイス,3は該ダイス2の背面に位置して同じく上記ダイリング1の円形透孔11に嵌合装着されたバッカー,4はダイリングを載置支持してこれに接触する非加熱部材のダイスライド,5はダイリングを受止めしてこれに接触する同じく非加熱部材のボルスター,6はコンテナであり,これらはいずれも鋼製のものとされる。
【0010】
このときダイリング1の外周面又は背面と非加熱部材4又は5との接触面にその接触面積を可及的に減少する溝,突起等の凹凸部12を介設し上記ダイリング1と被加熱部材4又は5との接触によるダイリング1の伝導放熱を可及的に抑制したものとしてあり,本例にあってはダイリング1の外周面又は背面に凹凸部12を配置し該ダイリング1と上記被加熱部材4又は5との接触によるダイリング1の伝導放熱を可及的に抑制したものとしてある。
【0011】
図1乃至3の例にあって上記凹凸部12は,これをダイリング1における外周面に溝13を形成することによって配置したものとしてあり,このとき凹凸部12を形成する溝13は,ダイリング1の外周面にその上記円形透孔11の貫通方向,即ち前後方向に向けて所定ピッチ平行に多数配置することによって,凹凸部12が該溝13による凹部と溝13間に形成されることになる凸部14とを交互に配置した外周面略全面に亘る比較的浅い波型をなすようにしてあり,これにより凸部14の先端がダイリング1を載置支持する上記ダイスライド4に対して線接触するようにし,またダイスライド4の載置支持状態でこれとの間に形成される凹部によって空気断熱層を配置し得るようにしてある。
【0012】
本例にあって凹凸部12は,例えば深さを2〜3mm程度乃至それ以下とするように,例えば半径5mm程度の円弧を外周面にローレット状をなす如くに連続配置することによって,円弧面による溝13と凸部14とを交互に等ピッチで配置したものとしてあり,これにより凸部14の上記ダイスライド4に対する線接触を可及的に微小の接触とするようにし,また上記ダイスライド4との間に形成される空隙内で空気対流を略完全に防止して空気断熱層としてその断熱性を可及的高度に確保し得るようにしてある。
【0013】
このように外周面に凹凸部12を配置した本例のダイリング1は,その円形透孔11に正面側の前方にダイス2を,背面側の後方にバッカー3を,これらが対接するようにそれぞれ嵌合収容し,常法に従って,例えば450℃程度に高温加熱し,図示省略の押出加工装置に装着して,加圧成形可能温度の同じく450℃程度に加熱したアルミビレットの押出加工を行うが,このときダイリング1が上記450℃程度であるに対して,押出加工装置に加熱することなく設置された上記被加熱部材をなすダイスライド4,ボルスター5は周辺からの熱を受けて幾分昇温するも常温程度の温度に置かれ,ダイリング1がこれらに接触するが,本例のように外周面に凹凸部12を配置したダイリング1を使用し,例えば複雑断面形状をなす住宅用サッシの上枠によるアルミバー材の押出加工の実験においては,8回の押出加工における開始当初とその後の肉厚(サンプル数は各押出加工毎に4箇所)最大1.42mm,最小1.38mmであり,いずれも0.04mmの範囲に納まる結果となり,従来の押出加工における一般的な許容寸法0.1mmの1/2以下のバラツキに過ぎなかった。また該上枠によるアルミバー材には形状のバラツキや長手方向の捻れ等は全く見られなかった。肉厚,形状のバラツキ,捻れ等の発生原因は,上記のようにダイス2における熱収縮によって生じるダイス孔21の変形にあるとされるところ,本例のダイリング1がその外周面に上記凹凸部12を配置して,ダイスライド4に対する接触を微細な線接触としたことが,凹凸部12を配置したことによるダイスライト4との間の空気断熱層の存在と相俟って,ダイリング1の伝導放熱を可及的に抑制し,ダイリング1の伝導放熱に起因するダイス2の冷却を防止し,ダイス2温度分布の均一性を確保することが,上記肉厚のバラツキを極限的に低下させ,変形や捻れのないアルミバー材を押出加工し得た主要因であることが判明した。
【0014】
図4は他の例を示すもので,本例にあって上記凹凸部12は,これを同じくダイリング1の外周面に溝13を形成することによって配置したものとし,このとき凹凸部12を形成する溝13は,ダイリング1の外周面の前後方向中間位置にその外周方向に向けて幅広にして比較的浅い単一の中間溝をなすように配置し,凹凸部12が該溝13による凹部とその前後両側の残存して細幅とされた外周面によるリブ状一対の凸部14とによって形成したものとしてあり,同じく一対の凸部14がダイリング1を載置支持する上記ダイリング1に対して中間の溝13部分を非接触とするように両側で面接触を行なってその安定支持を行なうとともにダイスライド4の載置支持状態でこれとの間に形成される上記溝13の凹部によって空気断熱層を配置し得るようにしてある。
【0015】
本例にあって凹凸部12の上記溝13は,例えば深さを上記と同様に2〜3mm程度乃至それ以下に浅くし,その幅を10〜15cm程度の幅広,本例にあっては10cm程度の幅広とすることによって,該浅く幅広の溝13の凹部による空隙内において同様に空気対流を略完全に防止してその断熱性を可及的高度に確保して,上記ダイリング1の伝導放熱を抑制するようにしてある。
【0016】
この場合も実験によれば同じく上枠によるアルミバー材における肉厚のバラツキは上記と略同様な範囲に納まり,変形や長手方向の捻れのないものとなし得た。
【0017】
図5は上記ダイリング1に凹凸部12を配置するのに代えて,ダイスライド4のダイリング受座を断面多角形とすることによってその前後方向に同一断面とすることによってダイリング受座の全体としての凹凸部41を配置した例であり,このときダイリング1は凹凸部12を配置することなくそのままリング状としても,ダイスライド4の多角の屈曲部42と屈曲部42間の各辺43による該全体としての凹凸部41が形成されることによって,ダイスライド4に載置支持状態でダイリング1は凹凸部41の各辺43に対して線接触してその接触面積を可及的に抑制し,このときダイスライド4の前後端面はコンテナ 及びボルスター5によって被覆されるから同じく辺43の接触部分以外の空隙に断熱空気層が形成されることになり,同様にダイリング1の非加熱部材たるダイスライド4に対する伝導放熱を抑制することができる。
【0018】
図6は上記ダイリング1の背面とボルスター5との間に凹凸部51を介設した例であり,本例にあって凹凸部51は,これをボルスター5の前面に配置してあり,このときボルスター5はその前面に水平多数にして浅い細溝とするように左右方向に向けて形成した溝52と該溝52間に残存したリブ状の凸部53による凹凸部51が形成されることによって,同じくダイリング1がボルスター5に受止めされてリブ状の凸部53に接触して同じくその接触面積を可及的に抑制し,このとき同様にボルスター5はコンテナによって被覆されるから上記溝52の凹部による空隙に断熱空気層が形成され,また本例にあって溝52の深さを2〜3mm乃至それ以下とすることによってその空気対流が略完全に防止されるに至り,同様にダイリング1の非加熱部材たるボルスター5に対する伝導放熱を抑制することができる。
【0019】
図示した例は以上としたが,本発明の実施形態として,凹凸部を溝によるものとするとき,該溝を単一又は複数にして適宜幅の直線乃至蛇行のものとすること,凹凸部を上記溝以外に,点状突起,桝目をなす交差リブ状突起等の適宜の突起を配置することによって形成するようにし,該突起によってダイリングと非加熱部材の接触を行い,その接触面積を抑制するようにし,またこのとき突起間の凹部による空隙を上記と同じく空気断熱層とすることが可能である。
【0020】
このように本発明の実施に当っては,ダイリング,ダイスライドやボルスター等の非加熱部材,凹凸部の材質,形状,構造,これらの関係,寸法や面積等の数値,これらに対する付加等は,上記発明の要旨に反しない限り様々の形態のものとすることができる。
【0021】
【発明の効果】
本発明は以上のとおりに構成したから,ダイスの熱収縮によって生じるダイス孔の変形に原因があるとされるアルミバー材の押出不良に対して,ダイリングと非加熱部材との間にその接触面積を可及的に減少する凹凸部を介設してダイリングの非加熱部材への伝導放熱を可及的に抑制し,ダイス温度分布の均一性を確保することにより,これを解消することが可能となり,従ってダイリング乃至非加熱部材に単に予め凹凸部を形成するという物理的措置を施すことによって,押出加工に際して特段の作業や管理を必要とすることなく,可及的簡易且つ確実に押出不良を解消し得るアルミバー材の押出加工装置を提供することができる。
【図面の簡単な説明】
【図1】ダイリングの正面図である。
【図2】ダイリングの側面図である。
【図3】ダイリングの装着状態を示す縦断面図である。
【図4】他の例に係るダイリングの斜視図である。
【図5】ダイスライドの縦断面図である。
【図6】ボルスターとダイリングの関係を示す縦断面図である。
【符号の説明】
1 ダイリング
2 ダイ
3 バッカー
4 ダイスライド
5 ボルスター
6 コンテナ
12 凹凸部
13 溝
14 凸部
41 凹凸部
42 屈曲部
43 辺
51 凹凸部
52 溝
53 凸部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an aluminum bar material extruding apparatus for extruding an aluminum bar material used in various fields such as building materials.
[0002]
[Prior art]
When the extrusion process of aluminum bar material (also called aluminum extruded shape) is continued by the extrusion processing equipment, the initial and subsequent aluminum bar material may have irregularities in wall thickness, shape variation, longitudinal twist, etc. Poor extrusion is likely due to the fact that the high-temperature heated dies for extruding aluminum are made of steel and radiate heat over time, resulting in a loss of uniformity in the temperature distribution between the center and the outer periphery. It is known that the non-uniform heat shrinkage of the dies is considered to be due to the deformation that narrows the die holes that define the shape of the aluminum bar formed at the center of the dies. In order to solve the problem, for example, Patent Document 1 discloses a method in which a heat insulating material is inserted into and mounted on the inner periphery of a die ring that fits and accommodates a die and a backer on the rear surface of the die, or the rear surface of the die ring is opened. A heat insulating material is embedded and filled in the formed annular groove to prevent the temperature of the die from being lowered by the heat insulating function of the heat insulating material, and to maintain uniformity of the temperature distribution of the die. Presupposes that it is inevitable that the uniformity of the temperature distribution on the center side and the outer peripheral side will be impaired by the heat radiation of the die. The temperature distribution is made lower and lower, so that the heat dissipation of the outer peripheral portion progresses to ensure the uniformity of the temperature distribution and suppress the heat shrinkage of the die.
[0003]
[Patent Document 1]
JP-A-4-228223 (pages 2 to 3, FIGS. 1 and 2)
[Patent Document 2]
JP-A-2001-259731 (pages 2 to 3, FIGS. 4 and 5)
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned Patent Document 1, since the heat insulating material is used for the die ring, the work of mounting the heat insulating material tends to be complicated, and the heat insulating material can be quickly mounted by mounting the heat insulating material on the die ring which is heated at a high temperature like the die. Since deterioration is expected, replacement of the heat insulating material and management for the heat insulating material become complicated, and the heating and temperature rising are delayed. In Patent Literature 2, since the heating of the dies is performed in such a state that the temperature distribution is different in height, the heating operation and the temperature management become complicated, and both have a problem that the workability of the extrusion processing is impaired.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a problem to be solved is to make it possible to eliminate extrusion defects as simply and reliably as possible without requiring any special work or management during extrusion. An object of the present invention is to provide an aluminum bar material extruding apparatus.
[0006]
[Means for Solving the Problems]
As a result of diligent studies in accordance with the above problems, the present inventors found that the uniformity of the temperature distribution of the dies was impaired because the dies and the backer were fitted and accommodated together with the dies and the high temperature, rather than the heat dissipation of the dies over time. When the die ring that is heated and mounted on the extruder is in contact with the die slide that supports and supports the bolster that is received on the back, these are unheated and installed on the extruder without heating. The main cause is that the conductive heat is dissipated so that the die ring heated to a high temperature by the contact is rapidly cooled because of the member, and a similar conductive heat radiation also occurs in the die due to the cooling of the die ring. In an extruder, dies, backers, bolsters, etc. are generally subjected to a large pressing force of about 2 × 10 7 N. The die ring located on the outer periphery of the die, backer, and so on bears only a part of the pressing force via the frictional force between the billet and the container and the sealing force of the container, and if its substantial weight, that is, the heat capacity and the basic shape can be maintained. It is possible to apply processing to the outer peripheral surface, the back surface, etc., and to apply the same processing to the non-heating member in contact with the outer peripheral surface, the back surface, etc. If the projections are uneven, the contact area of the die ring is reduced, and a heat insulating layer of air is formed in the recess to suppress the conductive heat dissipation without impairing the function of the die ring. It has been found that defects can be easily and reliably prevented without requiring any special operation.
[0007]
The present invention has been made based on such knowledge, that is, the present invention provides a groove, a protrusion, etc. on the contact surface between the outer peripheral surface or the back surface of the die ring and the non-heating member as much as possible. An aluminum bar material extruding apparatus characterized in that conduction and heat radiation of the die ring due to contact between the die ring and the member to be heated are suppressed as much as possible by interposing the concave and convex portions of the present invention. The gist is to solve the above problem.
[0008]
As a preferred embodiment of the uneven portion arrangement of the present invention, in order to effectively suppress conductive heat dissipation, the outer peripheral surface or the rear surface of the die ring is formed on the outer peripheral surface or the rear surface of the die ring so as to minimize the contact area of the die with the non-heating member. In order to arrange an uneven portion where the contact is a line contact or a point contact, and to maintain the substantial weight of the die ring at that time, the contact area on the outer peripheral surface is about 10% or less of the area (for example, 7 to 10%). 8%) and about 50% or less (eg, 30 to 40%) of the area on the back surface, and the air heat insulating layer formed in the void formed by the concave portion can exert its heat insulating properties as much as possible. In order to prevent air convection from occurring in the gap, the depth of the concavo-convex portion should be set as small as possible, and at that time, the depth should be set so that the possibility of air convection can be almost completely eliminated. About 2-3mm It is, for good results, respectively, by doing so.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the examples of the drawings. Reference numeral 1 denotes a die ring, 2 denotes a die hole for fitting an aluminum bar material 7 at a center portion thereof, which is fitted into a circular through hole 11 of the die ring 1. A die 3 having a die 21 is located on the back of the die 2 and a backer similarly fitted in the circular through-hole 11 of the die 1 and a non-contacting die 4 is placed on and supports the die ring. A die slide 5 of the heating member receives a die ring and contacts the dies, and a bolster 6 of the same non-heating member, and a container 6 is made of steel.
[0010]
At this time, a concave / convex portion 12 such as a groove, a protrusion, or the like that reduces the contact area as much as possible is provided on the contact surface between the outer peripheral surface or the back surface of the die ring 1 and the non-heating member 4 or 5 to cover the die ring 1. The conductive heat dissipation of the die ring 1 due to the contact with the heating member 4 or 5 is suppressed as much as possible. The conduction and heat dissipation of the die ring 1 due to the contact between the die 1 and the heated member 4 or 5 are suppressed as much as possible.
[0011]
In the example shown in FIGS. 1 to 3, the uneven portion 12 is arranged by forming a groove 13 on the outer peripheral surface of the die ring 1. At this time, the groove 13 forming the uneven portion 12 is a die. By arranging a large number of the circular through holes 11 on the outer peripheral surface of the ring 1 in parallel with a predetermined pitch in the penetration direction of the circular through holes 11, that is, in the front-rear direction, the uneven portions 12 are formed between the concave portions by the grooves 13 and the grooves 13. And a relatively shallow corrugation over substantially the entire outer peripheral surface in which the convex portions 14 are alternately arranged, so that the tip of the convex portion 14 is attached to the die slide 4 on which the die ring 1 is placed and supported. The die slide 4 is placed in line contact with the die slide 4, and the air heat insulating layer can be arranged by a concave portion formed between the die slide 4 and the die slide 4 in a state where the die slide 4 is placed and supported.
[0012]
In the present example, the concave and convex portion 12 is formed by continuously arranging circular arcs having a radius of approximately 5 mm, for example, on the outer peripheral surface so as to form a knurled shape so that the depth is approximately 2 to 3 mm or less. The grooves 13 and the protrusions 14 are alternately arranged at an equal pitch so that the line contact of the protrusions 14 with the die slide 4 is made as small as possible. Air convection is almost completely prevented in the gap formed between the air gap 4 and the air gap 4 so that the heat insulation property of the air heat insulation layer can be as high as possible.
[0013]
In this manner, the die ring 1 of the present embodiment, in which the concave and convex portions 12 are arranged on the outer peripheral surface, has the circular through hole 11 with the die 2 on the front side on the front side, the backer 3 on the rear side on the rear side, and so that they are in contact with each other. Each of them is fitted and accommodated, and is heated to, for example, about 450 ° C. at a high temperature according to a conventional method, and is mounted on an extruder (not shown) to extrude an aluminum billet which is heated to about 450 ° C., which is a press-moldable temperature. However, at this time, while the temperature of the die ring 1 is about 450 ° C., the die slides 4 and the bolsters 5 serving as the above-mentioned heated members which are installed without being heated in the extruding apparatus receive heat from the surroundings, and thus are not heated. Although the temperature is raised by a certain amount, the die ring 1 is placed at a temperature of about room temperature, and the die ring 1 comes in contact with them. As shown in this example, the die ring 1 in which the concave and convex portions 12 are arranged on the outer peripheral surface is used. Residential accessories In the experiment on the extrusion of aluminum bar material with the upper frame, the thickness at the beginning and after the start of eight extrusions (the number of samples is four at each extrusion) is 1.42 mm at maximum and 1.38 mm at minimum. In each case, the result was within the range of 0.04 mm, which was only a variation of 1/2 or less of the general allowable dimension of 0.1 mm in the conventional extrusion processing. Also, no variation in the shape and no twist in the longitudinal direction were observed in the aluminum bar material formed by the upper frame. It is believed that the cause of the thickness, shape variation, and torsion is due to the deformation of the die hole 21 caused by the heat shrinkage of the die 2 as described above. The fact that the contact with the die slide 4 is fine line contact by arranging the part 12 is coupled with the existence of the air heat insulating layer between the die light 4 due to the arrangement of the concave and convex part 12, and the die ring In order to suppress the heat dissipation of the die 1 as much as possible, to prevent the cooling of the die 2 caused by the heat dissipation of the die 1, and to maintain the uniformity of the temperature distribution of the die 2, it is possible to minimize the above-mentioned thickness variation. It was found that this was the main factor in extruding aluminum bars without deformation or twisting.
[0014]
FIG. 4 shows another example. In this example, it is assumed that the uneven portion 12 is arranged by forming a groove 13 on the outer peripheral surface of the die ring 1 as well. The groove 13 to be formed is arranged at an intermediate position in the front-rear direction of the outer peripheral surface of the die ring 1 so as to form a single intermediate groove which is wide in the outer peripheral direction and is relatively shallow. The above-mentioned die ring, which is formed by a pair of convex portions 14 formed by a concave portion and a remaining narrow outer peripheral surface on both front and rear sides thereof, and the pair of convex portions 14 also mount and support the die 1. The surface of the groove 13 formed between the surface of the die slide 4 and the die slide 4 is stably supported by making surface contact on both sides so that the intermediate groove 13 is not in contact with the surface of the die slide 4. Air insulation layer provided by recess Are you as to be in.
[0015]
In the present embodiment, the groove 13 of the uneven portion 12 has a depth of, for example, about 2 to 3 mm or less as described above and a width of about 10 to 15 cm, and in this example, 10 cm. By making it as wide as possible, air convection is almost completely prevented in the gap formed by the concave portion of the shallow and wide groove 13 as well, and the heat insulating property is as high as possible. The heat radiation is suppressed.
[0016]
Also in this case, according to the experiment, the variation in the thickness of the aluminum bar material due to the upper frame was in the same range as above, and it was possible to eliminate deformation and twist in the longitudinal direction.
[0017]
FIG. 5 shows that instead of arranging the concave and convex portions 12 on the die ring 1, the die slide seat of the die slide 4 is made to have the same cross section in the front-rear direction by making the cross section polygonal. This is an example in which uneven portions 41 are arranged as a whole. At this time, even if the die ring 1 is formed in a ring shape without disposing the uneven portions 12, each side between the polygonal bent portions 42 of the die slide 4 and the bent portions 42. By forming the uneven portion 41 as a whole by 43, the die ring 1 makes line contact with each side 43 of the uneven portion 41 in a state of being placed and supported on the die slide 4 to reduce the contact area as much as possible. At this time, since the front and rear end surfaces of the die slide 4 are covered with the container and the bolster 5, an adiabatic air layer is formed in a space other than the contact portion of the side 43 similarly. In addition, conductive heat radiation to the die slide 4 as a non-heating member of the die ring 1 can be suppressed.
[0018]
FIG. 6 shows an example in which an uneven portion 51 is provided between the back surface of the die ring 1 and the bolster 5. In this example, the uneven portion 51 is arranged on the front surface of the bolster 5. At the time, the bolster 5 has a plurality of grooves 52 formed in the left and right direction so as to form a shallow narrow groove with a large number of horizontal grooves on the front surface thereof, and a rib-shaped convex portion 53 remaining between the grooves 52 has an uneven portion 51 formed. Similarly, the die ring 1 is received by the bolster 5 and comes into contact with the rib-like convex portion 53 to minimize the contact area as much as possible. At this time, the bolster 5 is similarly covered by the container. A heat insulating air layer is formed in the gap formed by the concave portion of the groove 52. In this example, by setting the depth of the groove 52 to 2 to 3 mm or less, the air convection is almost completely prevented. Die 1 The conductive heat dissipation for unheated member serving bolster 5 can be suppressed.
[0019]
Although the illustrated example has been described above, as an embodiment of the present invention, when the concave and convex portions are formed by grooves, the grooves may be single or plural and have a straight or meandering width as appropriate. In addition to the above-mentioned grooves, appropriate projections such as point-like projections and cross rib-like projections that form a grid are formed by arranging the projections, and the projections make contact between the die ring and the non-heating member, thereby suppressing the contact area. In this case, the gap formed by the recess between the projections can be used as the air heat insulating layer as described above.
[0020]
As described above, in the practice of the present invention, non-heating members such as die rings, die slides and bolsters, the material, shape and structure of the concave and convex portions, their relations, numerical values such as dimensions and areas, and additions to these are described. Various forms can be adopted without departing from the gist of the invention.
[0021]
【The invention's effect】
Since the present invention is configured as described above, the contact between the die ring and the non-heated member can be prevented against the extrusion failure of the aluminum bar material caused by the deformation of the die hole caused by the heat shrinkage of the die. To eliminate this by providing as much unevenness as possible to reduce the area of the die to minimize conduction and heat dissipation to the non-heated member of the die ring and to ensure uniform die temperature distribution. Therefore, by taking physical measures such as simply forming irregularities in advance on a die or a non-heated member, it is possible to make extrusion and extrusion as simple and reliable as possible without requiring any special work or management. It is possible to provide an aluminum bar material extruding apparatus capable of eliminating poor extrusion.
[Brief description of the drawings]
FIG. 1 is a front view of a die ring.
FIG. 2 is a side view of the die ring.
FIG. 3 is a vertical cross-sectional view showing a mounting state of a die ring.
FIG. 4 is a perspective view of a die ring according to another example.
FIG. 5 is a longitudinal sectional view of a die slide.
FIG. 6 is a longitudinal sectional view showing a relationship between a bolster and a die ring.
[Explanation of symbols]
Reference Signs List 1 die ring 2 die 3 backer 4 die slide 5 bolster 6 container 12 uneven portion 13 groove 14 convex portion 41 uneven portion 42 bent portion 43 side 51 uneven portion 52 groove 53 convex portion

Claims (1)

ダイリングの外周面又は背面と非加熱部材との接触面にその接触面積を可及的に減少する溝,突起等の凹凸部を介設し上記ダイリングと被加熱部材との接触によるダイリングの伝導放熱を可及的に抑制してなることを特徴とするアルミバー材の押出加工装置。Grooves, protrusions, and other irregularities that reduce the contact area as much as possible are provided on the contact surface between the outer peripheral surface or back surface of the die ring and the non-heated member, and the die ring is formed by contact between the die ring and the member to be heated. An extruding device for aluminum bar material, characterized in that conduction and heat dissipation of the material are suppressed as much as possible.
JP2003011127A 2003-01-20 2003-01-20 Extrusion device for aluminum bar material Pending JP2004223524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003011127A JP2004223524A (en) 2003-01-20 2003-01-20 Extrusion device for aluminum bar material

Publications (1)

Publication Number Publication Date
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Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010234385A (en) * 2009-03-30 2010-10-21 Showa Denko Kk Method for manufacturing aluminum extruded material
CN102527758A (en) * 2012-01-20 2012-07-04 东莞汉旭五金塑胶科技有限公司 Extrusion moulding die for aluminum base of radiator and manufacture method thereof
JP2013052429A (en) * 2011-09-06 2013-03-21 Riken Light Metal Ind Co Ltd Extruding die unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010234385A (en) * 2009-03-30 2010-10-21 Showa Denko Kk Method for manufacturing aluminum extruded material
JP2013052429A (en) * 2011-09-06 2013-03-21 Riken Light Metal Ind Co Ltd Extruding die unit
CN102527758A (en) * 2012-01-20 2012-07-04 东莞汉旭五金塑胶科技有限公司 Extrusion moulding die for aluminum base of radiator and manufacture method thereof

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