| 摘要 |
PURPOSE:To serve with a small sized vacuum pump, to reduce an equipment cost and to improve workability by fitting a deaerating pipe to the end of a clad billet and deaerating with a vacuum pump through this deaerating pipe. CONSTITUTION:An inner pipe 1 and outer pipe 2 are fitted after prepg. in advance and a deaerating pipe 4 is fitted with sealing it by a weld zone 5 by communicating to clad gap 3 to the end part becoming the rear end at extruding time of a clad billet B. The clad gap 3 excepting at the deaerating pipe 4 fitting part is subjected to arc welding at the billet B end and sealed by forming an arc welding zone 6. Thereafter, a connection pipe 7 is connected to the deaerating pipe 4 to deair the gap 3 by a small sized vacuum pump 8. The deaerating pipe 4 is flattened by squeezing it by a flat working press in succession and the inner face of the deaerating pipe 4 is subjected to seal welding 11 as well. The deaerating pipe 4 is then bent and the protection ring 12 projecting from the deaerating pipe 4 is fitted to the outer pipe 2 end at the deaerating pipe 4 fitting side as well and hot extrusion is executed after effecting the protection so that the bent deaerating pipe 4 may not be broken in the case of heating it by a heater, and the deaerating pipe 4 and protection ring 12 become a discard.
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