PROCESSING METHOD OF TUBING MATERIAL

• Main Authors: WADA NORIYUKI, HARA YUTAKA, SAITO MARIKO, TERAUCHI YUJI
• Format: Patent
• Language: English; Japanese
• Published: 07.04.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

To provide a processing method of a tubing material which prevents, when performing expansion processing of the tubing material by inner pressure of fluid in the tubing material, deformation of the tubing material in an axial direction and is capable of securing sealability of the tubing material.SOLUTION: A processing method of a shaft 20 (tubing material) includes a sealing step in which a projection 212 of a punch member 210 is pushed in an edge face 51 of the shaft 20 and an inclined plane 213 (second inclined plane) of the punch member 210 seals an inclined plane 53 (first inclined plane) of the shaft 20, a portion 20a of the shaft 20 sandwiched between the projection 212 and the inclined plane 213 is compressed to generate compression stress, and the compression stress is applied to a seal portion 20b so as to seal an aperture 21b of the shaft 20. While inside of the shaft 20 is sealed after the sealing step, the shaft 20 is expanded (deformed) by inner pressure of fluid L filled in the shaft 20.SELECTED DRAWING: Figure 6 【課題】管材の内部の流体による内圧によって管材を膨張させる加工を行う場合に、管材の軸方向の変形を防止しながら管材のシール性を確保することが可能な管材の加工方法を提供する。【解決手段】このシャフト２０（管材）の加工方法は、パンチ部材２１０の突出部２１２をシャフト２０の端面５１に押し込みながら、パンチ部材２１０の傾斜面２１３（第２傾斜面）によりシャフト２０の傾斜面５３（第１傾斜面）をシールすることによって、突出部２１２と傾斜面２１３との間に挟まれるシャフト２０の部分２０ａが圧縮されることに起因して生じる圧縮応力をシール部２０ｂに付与した状態で、シャフト２０の開口部２１ｂをシールするシール工程を備える。そして、上記シール工程の後、シャフト２０の内部が密閉された状態で、シャフト２０の内部に充填された流体Ｌによる内圧によってシャフト２０が膨張（変形）される。【選択図】図６