| 摘要 |
PURPOSE:To properly control the clearance of a brazed part to obtain excellent brazing by holding a component with dies pressurized with by a hot press, pressurizing the inner part of the component with inert gas introduced into the inner part of the component, simultaneously with it, heating and brazing the component. CONSTITUTION:The dimple head part 2a of a dimple core 2 is coated by thermal spray of low pressure plasma with brazing filler metal, a component 7 laminated with two skins 1 and sealed by technical inert gas welding on the periphery is set between preheated dies 3, 4 and the inner air is evacuated through a tube 6 provided on the skin 1. The dies 3, 4 and the component 7 are elevated by side heaters 5 in temperature and the skins 1 and hot sizing is performed by a press 8 to the skins 1 and the dimple core 2. At this time, brazing clearance is made below the thickness of a sprayed deposit. When the dies 3, 4 and the component 7 rise in temperature, Ar gas is introduced into the inner part of the component 7 and the pressure is held at a prescribed value. The temperature is elevated continuously until it arrives at the brazing temperature and the brazing temperature is held for a prescribed time. The temperature is lowered and brazing is completed at the prescribed temperature. |
