JP2001137959A5

JP2001137959A5 -

Info

Publication number: JP2001137959A5
Application number: JP1999317364A
Authority: JP
Filing date: 1999-11-08
Publication date: 2006-12-07

Description

【特許請求の範囲】
【請求項１】外部から温度制御可能な加熱ヒータが内部に配置されていることを特徴とする曲げ加工用マンドレル。
【請求項２】請求項１に記載のマンドレルを筒形ワーク内に挿入し、この状態で、加熱ヒータによって前記マンドレルを加熱したのち、曲げ加工することを特徴とする曲げ加工方法。
【請求項３】マンドレルの外周面と筒形ワークの内面との間にクリアランスが形成された状態で、マンドレルを筒形ワーク内に挿入する工程と、
挿入後、ワークを熱膨張させる工程と、
ワークを熱膨張させた状態で曲げ加工する工程と、
を含むことを特徴とする曲げ加工方法。
【請求項４】マンドレルの筒形ワーク内への挿入は、前記マンドレルを加熱することなく行われる請求項２または３に記載の曲げ加工方法。
【請求項５】ワークを固定金型のワーク導通孔に導通させた状態で曲げ加工を行う請求項２または３に記載の曲げ加工方法。
【請求項６】ワークをジャイロ金型のワーク導通孔に導通させた状態で曲げ加工を行う請求項２または３に記載の曲げ加工方法。
【請求項７】ワークを、固定金型のワーク導通孔及びジャイロ金型のワーク導通孔にそれぞれ導通させた状態で曲げ加工を行う請求項２または３に記載の曲げ加工方法。
【請求項８】曲げ加工が押し通し式曲げ加工である請求項２ないし７のいずれかに記載の曲げ加工方法。 [Claims]
1. A mandrel for bending, characterized in that a heater whose temperature can be controlled from the outside is arranged inside.
2. A bending method according to claim 1, wherein the mandrel according to claim 1 is inserted into a tubular work, and in this state, the mandrel is heated by a heating heater and then bent.
3. The process of inserting the mandrel into the tubular work with a clearance formed between the outer peripheral surface of the mandrel and the inner surface of the tubular work,
After insertion, the process of thermally expanding the work and
The process of bending the work in a thermally expanded state and
A bending method characterized by including.
4. The bending method according to claim 2 or 3, wherein the mandrel is inserted into the tubular work without heating the mandrel.
5. The bending method according to claim 2 or 3, wherein the bending process is performed in a state where the work is conducted in a state where the work is conducted through the work conduction hole of the fixed die.
6. The bending method according to claim 2 or 3, wherein the bending process is performed in a state where the work is conducted in a state where the work is conducted in the work conduction hole of the gyro mold.
7. The bending method according to claim 2 or 3, wherein the work is bent in a state where the work is electrically connected to the work conduction hole of the fixed mold and the work conduction hole of the gyro mold, respectively.
8. The bending method according to any one of claims 2 to 7, wherein the bending process is a push-through type bending process.