JPH0924416A - Method for measuring bending amount of end part of mandrel and method for extruding tube - Google Patents
Method for measuring bending amount of end part of mandrel and method for extruding tubeInfo
- Publication number
- JPH0924416A JPH0924416A JP17607995A JP17607995A JPH0924416A JP H0924416 A JPH0924416 A JP H0924416A JP 17607995 A JP17607995 A JP 17607995A JP 17607995 A JP17607995 A JP 17607995A JP H0924416 A JPH0924416 A JP H0924416A
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- bending
- tip
- bending amount
- amount
- 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
Landscapes
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Extrusion Of Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、マンドレル先端部の曲
がり量を効率よく測定する方法、及び前記マンドレル先
端部の曲がりの向きを所定方向に向けて押出すことによ
り管の偏肉不良を低減させる管の押出方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently measuring the bending amount of a mandrel tip portion, and to reduce the uneven thickness of a pipe by extruding the bending direction of the mandrel tip portion in a predetermined direction. The present invention relates to a method for extruding a tube.
【０００２】[0002]
【従来の技術】マンドレルは管を押出す際に、管の内径
を保持する為に管に装入する工具である。このマンドレ
ルを用いた管の押出法は、図３に示すように、素材（中
実のビレット）30をコンテナ40に入れて押出プレス50に
装着し、マンドレル10で穿孔した後、ステム60を押込ん
で、ダイス70とマンドレル10の間から管80を押出す方法
により行われている。上述の押出法では、マンドレル10
に過大な力が掛かり、特に、押出を熱間で行う場合は、
図４に示すように、マンドレル先端部11が、経時的に弓
なりに曲がり出す。この曲がり量が大きくなると押出さ
れる管80に偏肉や表面性状不良が発生する。前記マンド
レル先端部11の曲がりの程度は、素材をコンテナに据え
込む前に、目視により判定しており、曲がりがある程度
酷くなるとマンドレル10を交換していた。しかし、マン
ドレル10は高温に加熱されている為、目視は遠方より行
わざるを得ず、従って、曲がりに対する判定ミスが多く
製造歩留りの低下の原因になっていた。そこで、マンド
レル先端部の側面に、変位量検出ヘッドを接触させ、マ
ンドレルを軸回転させて、変位計とマンドレル先端部の
側面との距離をマンドレルの全側面に沿って測定し、更
に曲がり量が最大になる方向を一定方向に制御して曲が
りによる弊害を低減させる装置が提案された（特開平4-
127914号）。2. Description of the Related Art A mandrel is a tool that is inserted into a pipe to hold the inside diameter of the pipe when the pipe is extruded. As shown in FIG. 3, the tube extruding method using this mandrel is as follows. The material (solid billet) 30 is put in a container 40, mounted on an extrusion press 50, perforated by the mandrel 10, and then the stem 60 is pushed in. Then, the pipe 80 is extruded from between the die 70 and the mandrel 10. In the extrusion method described above, the mandrel 10
Excessive force is applied, especially when the extrusion is performed hot,
As shown in FIG. 4, the mandrel tip 11 begins to bend in a bow over time. If this amount of bending becomes large, uneven thickness and poor surface quality will occur in the extruded pipe 80. The degree of bending of the mandrel tip 11 was visually determined before the material was set in the container, and the mandrel 10 was replaced when the bending became severe. However, since the mandrel 10 is heated to a high temperature, it is unavoidable that the mandrel 10 is visually observed from a distance. Therefore, there are many erroneous judgments regarding bending, which causes a decrease in manufacturing yield. Therefore, the displacement amount detection head is brought into contact with the side face of the mandrel tip, the mandrel is rotated axially, the distance between the displacement meter and the side face of the mandrel tip is measured along all sides of the mandrel, and the bending amount is further increased. A device has been proposed that controls the maximum direction to a fixed direction to reduce the adverse effects caused by bending (Japanese Patent Laid-Open No. Hei 4-
No. 127914).
【０００３】[0003]
【発明が解決しようとする課題】しかし、前述の接触式
測定法では、変位量検出ヘッドは、マンドレルの熱によ
り変質して測定精度が低下し、又変位量検出ヘッドの寿
命が短くコスト高になるという問題があった。本発明者
等は、マンドレルの曲がり量を長期に渡り高精度に測定
できる方法を探究するとともに、マンドレルの曲がりと
管の品質との関係について鋭意研究を重ねて、本発明を
完成するに至った。本発明の目的は、マンドレル先端部
の曲がり量を長期間高精度に測定する方法及び同じマン
ドレルでより多数の良品の管を押出す方法を提供するこ
とにある。However, in the above-mentioned contact type measuring method, the displacement amount detecting head is deteriorated by the heat of the mandrel and the measuring accuracy is lowered, and the life of the displacement amount detecting head is short and the cost is high. There was a problem of becoming. The present inventors have pursued a method capable of measuring the bending amount of a mandrel with high accuracy over a long period of time, and have earnestly studied the relationship between the bending of the mandrel and the quality of the pipe, and have completed the present invention. . An object of the present invention is to provide a method for measuring the bending amount of the tip of a mandrel with high accuracy for a long period of time and a method for extruding a larger number of non-defective tubes with the same mandrel.
【０００４】[0004]
【課題を解決する為の手段】請求項１記載の発明は、マ
ンドレル先端部の曲がり量を非接触式変位計を用いて測
定することを特徴とするマンドレル先端部の曲がり量の
測定方法である。According to a first aspect of the present invention, there is provided a method for measuring the bending amount of the tip of the mandrel, wherein the bending amount of the tip of the mandrel is measured by using a non-contact type displacement gauge. .
【０００５】前記非接触式変位計によるマンドレル先端
部の曲がり量の測定は、変位計をマンドレル先端部の周
囲に配置し、マンドレルを軸回転させ、変位計とマンド
レル先端部側面との距離を測定して行う。変位計は、マ
ンドレル先端部の周囲の上下左右等どこに置いても良
い。この発明において、非接触式変位計には、光学式
（レーザー）変位計、超音波式変位計、渦電流式変位計
等が適用される。The amount of bending of the tip of the mandrel is measured by the non-contact type displacement gauge. The displacement gauge is arranged around the tip of the mandrel and the mandrel is rotated around the axis to measure the distance between the displacement gauge and the side surface of the tip of the mandrel. Then do. The displacement meter may be placed anywhere around the tip of the mandrel, such as vertically and horizontally. In this invention, an optical (laser) displacement gauge, an ultrasonic displacement gauge, an eddy current displacement gauge, etc. are applied to the non-contact displacement gauge.
【０００６】以下に、この発明を図を参照して説明す
る。図１イ、ロは、この発明方法の態様を示すそれぞれ
正面図と側面図である。マンドレル先端部11の上方にレ
ーザー式変位計20がマンドレル10の軸芯の上方に、マン
ドレル10の熱の影響を受けない距離をあけて固定配置さ
れている。The present invention will be described below with reference to the drawings. 1A and 1B are a front view and a side view, respectively, showing an embodiment of the method of the present invention. A laser displacement meter 20 is fixedly arranged above the mandrel tip 11 above the axis of the mandrel 10 with a distance not affected by the heat of the mandrel 10.
【０００７】次に、マンドレル先端部の曲がり量の測定
方法を図２を参照して説明する。マンドレル10を軸回転
させて、変位計20とマンドレル先端部11側面との距離を
マンドレル先端部11の全側面に沿って連続的に測定す
る。曲がり量は、前記距離の最大値Ｌ2 と最小値Ｌ1 の
差の２分の１で表示する。Next, a method of measuring the bending amount of the tip of the mandrel will be described with reference to FIG. By axially rotating the mandrel 10, the distance between the displacement gauge 20 and the side surface of the mandrel tip 11 is continuously measured along the entire side surface of the mandrel tip 11. The amount of bending is displayed as one half of the difference between the maximum value L 2 and the minimum value L 1 of the distance.
【０００８】請求項２記載の発明は、マンドレル先端部
の曲がり量を非接触式の変位計を用いて測定し、前記マ
ンドレル先端部の曲がりの向きを、所定方向に向けてマ
ンドレルを固定し押出すことを特徴とする管の押出方法
である。According to a second aspect of the present invention, the amount of bending of the tip of the mandrel is measured by using a non-contact type displacement meter, and the bending of the tip of the mandrel is fixed in a predetermined direction and the mandrel is fixed and pushed. It is a method of extruding a tube characterized by taking out.
【０００９】本発明において、マンドレルの曲がりの向
きを向ける所定方向とは、偏肉等の発生が減少する方向
である。この所定方向は、用いる押出機、押出材料、押
出条件等により変化するもので、個々に予備実験等によ
り調査しておく必要がある。In the present invention, the predetermined direction in which the bending of the mandrel is directed is a direction in which the occurrence of uneven thickness or the like is reduced. This predetermined direction varies depending on the extruder used, the extrusion material, the extrusion conditions, etc., and it is necessary to individually investigate it by preliminary experiments.
【００１０】測定した曲がり量が予め設定しておいた許
容値内の場合は、曲がりの向きを、偏肉が起き難い方向
に向けてマンドレルを固定し押出す。曲がり量が許容値
を超えた場合は、マンドレルを交換する。許容値を超え
た場合、警報が鳴るようにしておくと、交換ミスがなく
なり好ましい。例えば、マンドレルの曲がりの向きを上
方に向けると偏肉の程度が小さくなる場合は、変位計を
マンドレルの上方に配置しておき、マンドレルを軸回転
して、マンドレル先端部側面と変位計との距離が最小と
なるところでマンドレルを固定し押出しを再開する。When the measured bending amount is within a preset allowable value, the mandrel is fixed and extruded with the bending direction oriented so that uneven thickness is unlikely to occur. If the amount of bend exceeds the allowable value, replace the mandrel. It is preferable to set an alarm to sound when the allowable value is exceeded so that replacement mistakes can be avoided. For example, when the degree of uneven thickness decreases when the mandrel bends upward, the displacement meter is placed above the mandrel, and the mandrel is rotated around the axis to displace the mandrel tip side surface and the displacement meter. Fix the mandrel and restart extrusion at the minimum distance.
【００１１】前記の請求項１又は請求項２記載の発明
は、銅、アルミ、鋼等の金属、及びこれらの合金等の管
の押出しに広く適用することができる。The invention according to claim 1 or 2 can be widely applied to the extrusion of tubes of metals such as copper, aluminum and steel, and alloys thereof.
【００１２】[0012]
【作用】請求項１記載の発明では、マンドレル先端部の
曲がり量を非接触式変位計を用いて測定するので、変位
計はマンドレルの熱の影響を受け難く、曲がり量を長期
間高精度に測定できる。マンドレル先端部の曲がりの向
きを、押出される管に偏肉等が起き難い所定方向に向け
て押出すので、同じマンドレルで、より多数の良品の管
を押出せる。According to the invention of claim 1, since the amount of bending of the tip of the mandrel is measured by using a non-contact type displacement meter, the displacement meter is not easily affected by the heat of the mandrel, and the amount of bending can be accurately adjusted for a long time. Can be measured. Since the extruding pipe is extruded in a predetermined direction in which uneven thickness is unlikely to occur in the extruded pipe, a larger number of non-defective pipes can be extruded by the same mandrel.
【００１３】[0013]
【実施例】以下に、本発明を実施例により詳細に説明す
る。 （実施例１）図３に示した押出方法により銅管をバッチ
式に熱間押出しして、マンドレル先端部の曲がりの向き
と偏肉の関係を求めた（予備実験）。マンドレル先端部
の外周の所定位置にレーザー式変位計を配置した。押出
サイクルで、ビレットをコンテナに据え込む前に、マン
ドレル先端部の曲がり量を測定した。マンドレル先端部
に曲がりが検出された場合、曲がり量が最大になる向き
を変位計を配した方向に向けて押出を開始した。マンド
レルの曲がり量（図４に示すａ）が一定値ｋを超えたと
ころで、マンドレルを新品に取り替えた。前記変位計の
配置位置はマンドレル先端部外周の上下左右の４箇所に
変化させた。The present invention will be described below in detail with reference to examples. (Example 1) A copper pipe was hot extruded in a batch manner by the extrusion method shown in Fig. 3 to determine the relationship between the bending direction of the tip of the mandrel and the uneven thickness (preliminary experiment). A laser displacement meter was placed at a predetermined position on the outer circumference of the mandrel tip. In the extrusion cycle, the amount of bending of the mandrel tip was measured before the billet was installed in the container. When a bend was detected at the tip of the mandrel, extrusion was started with the direction of maximum bend being oriented in the direction of the displacement gauge. When the bending amount of the mandrel (a shown in FIG. 4) exceeded a certain value k, the mandrel was replaced with a new one. The positions of the displacement gauges were changed to four positions on the outer circumference of the tip of the mandrel.
【００１４】このようにして得られた銅管について偏肉
の程度を調べ、偏肉不良率をマンドレルの曲がり量別に
計測した。結果を表１に示す。The degree of uneven thickness of the copper pipe thus obtained was examined, and the uneven thickness defect rate was measured for each bending amount of the mandrel. The results are shown in Table 1.
【００１５】[0015]
【表１】 マンドレル先端部の曲がりの向き。[Table 1] The bending direction of the mandrel tip.
【００１６】表１より明らかなように、曲がりの向きを
上に向けたもの(No.1)は他の方向に向けたもの (No.2〜
4)より偏肉不良率が小さかった。As is clear from Table 1, the one with the bend facing upward (No. 1) has the other direction (No. 2 ~).
The uneven thickness defect rate was smaller than 4).
【００１７】（実施例２）実施例１の予備実験の結果に
基づいて、銅管の熱間押出をマンドレル先端部の曲がり
の向きを上方に向けて行った。(Example 2) Based on the result of the preliminary experiment of Example 1, hot extrusion of a copper tube was carried out with the bending direction of the tip of the mandrel facing upward.
【００１８】（比較例１）変位計に、従来の接触式の変
位量検出ヘッドを用いてマンドレル先端部の曲がり量を
測定した他は、実施例２と同じ方法により銅管を熱間押
出しした。COMPARATIVE EXAMPLE 1 A copper tube was hot extruded by the same method as in Example 2 except that the conventional contact type displacement amount detecting head was used for the displacement meter to measure the bending amount of the tip of the mandrel. .
【００１９】得られた銅管について、偏肉不良率及び使
用したマンドレル本数を調べた。結果を表２に示す。With respect to the obtained copper pipes, the uneven thickness defect rate and the number of mandrels used were examined. Table 2 shows the results.
【００２０】[0020]
【表２】 [Table 2]
【００２１】表２より明らかなように、本発明例のNo.5
は、偏肉不良率が小さく、使用マンドレル本数も少なか
った。これに対し、比較例のNo.6は、偏肉不良率が大き
く、使用マンドレル本数も多かった。これは、変位計が
接触式の為マンドレルの熱の影響により検出ヘッドが変
質して、曲がり量を適正に測定できなくなった為であ
る。As is clear from Table 2, No. 5 of the present invention example
Had a low uneven thickness defect rate and a small number of mandrels used. On the other hand, in Comparative Example No. 6, the uneven thickness defect rate was large and the number of mandrels used was also large. This is because the displacement head is a contact type and the detection head deteriorates due to the influence of the heat of the mandrel, and the amount of bending cannot be measured properly.
【００２２】前記実施例では、マンドレルの先端部の曲
がりの向きを上下左右の４通りに変えたが、曲がりの向
きを、斜め方向等を含めて細かく変えることにより、良
品率を更に高め得る可能性がある。前記実施例では、変
位計にレーザー式変位計を用い、銅管を熱間で押出す場
合について説明したが、本発明は、他の非接触式変位計
を用い、又他の材料を種々の温度で押出す場合に適用し
ても同様の効果が得られる。In the above-described embodiment, the bending direction of the tip of the mandrel is changed to four directions, up, down, left and right. However, by finely changing the bending direction including the diagonal direction, it is possible to further improve the non-defective rate. There is a nature. In the above-mentioned embodiment, a laser displacement meter is used as the displacement meter, and the case where the copper pipe is extruded hot is explained. However, the present invention uses other non-contact type displacement meters and various materials are used. The same effect can be obtained by applying the method when extruding at a temperature.
【００２３】[0023]
【発明の効果】以上に述べたように、本発明では、変位
計が非接触式なので、マンドレルの曲がり量を長期間高
精度に測定できる。マンドレルの曲がりの向きを偏肉等
が起き難い所定方向に向けて押出すことにより、同じマ
ンドレルでより多数の良品の管を押出すことができ生産
性が向上する。As described above, according to the present invention, since the displacement gauge is a non-contact type, the bending amount of the mandrel can be measured with high accuracy for a long period of time. By extruding the bending direction of the mandrel in a predetermined direction in which uneven thickness is unlikely to occur, a larger number of non-defective pipes can be extruded by the same mandrel and the productivity is improved.
【図１】本発明方法における非接触式変位計の設定状況
の態様を示す正面図及び側面図である。FIG. 1 is a front view and a side view showing an aspect of a setting state of a non-contact type displacement meter in the method of the present invention.
【図２】本発明方法におけるマンドレル先端部の曲がり
量の測定方法の説明図である。FIG. 2 is an explanatory diagram of a method of measuring the bending amount of the mandrel tip portion in the method of the present invention.
【図３】管の熱間押出方法の説明図である。FIG. 3 is an explanatory diagram of a hot extrusion method of a tube.
【図４】マンドレル先端部の曲がりの説明図である。FIG. 4 is an explanatory view of the bending of the mandrel tip portion.
10────マンドレル 11────マンドレル先端部 20────非接触式変位計 30────素材（中実ビレット） 40────コンテナ 50────押出プレス 60────ステム 70────ダイス 80────管 10 ──── Mandrel 11 ──── Mandrel tip 20 ──── Non-contact displacement gauge 30 ──── Material (solid billet) 40 ──── Container 50 ──── Extrusion press 60─ ─── Stem 70 ──── Dice 80 ──── Pipe
Claims (2)
変位計を用いて測定することを特徴とするマンドレル先
端部の曲がり量の測定方法。1. A method of measuring the bending amount of a mandrel tip portion, which comprises measuring the bending amount of the mandrel tip portion using a non-contact type displacement gauge.
の変位計を用いて測定し、前記マンドレル先端部の曲が
りの向きを、所定方向に向けてマンドレルを固定し押出
すことを特徴とする管の押出方法。2. The bending amount of the mandrel tip portion is measured using a non-contact type displacement gauge, and the mandrel is fixed and extruded so that the bending direction of the mandrel tip portion is directed in a predetermined direction. Tube extrusion method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17607995A JPH0924416A (en) | 1995-07-12 | 1995-07-12 | Method for measuring bending amount of end part of mandrel and method for extruding tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17607995A JPH0924416A (en) | 1995-07-12 | 1995-07-12 | Method for measuring bending amount of end part of mandrel and method for extruding tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0924416A true JPH0924416A (en) | 1997-01-28 |
Family
ID=16007359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17607995A Pending JPH0924416A (en) | 1995-07-12 | 1995-07-12 | Method for measuring bending amount of end part of mandrel and method for extruding tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0924416A (en) |
-
1995
- 1995-07-12 JP JP17607995A patent/JPH0924416A/en active Pending
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