| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an impeller in which the impeller is manufactured so that burrs hardly remain even in an intermediate part of a blade at its completion, while being easy to manufacture, and degradation of discharge performance in the high rotation due to influence of burrs is suppressed. <P>SOLUTION: An upper surface of an unit blade plate 21 made of hard synthetic resin extending in multiple radial directions is formed as a blade end surface 21a, and on the surface an acute projection ridge 4 is situated. A truncated cone-shaped front plate 1, and a blade 2 in which the acute projection ridge 4 having a smaller width than that of the blade end surface 21a is integrally formed with an acute angle on its top end, is provided in advance. Next, an unit length volume Vs of an intermediate part in a longitudinal direction of the acute projection ridge 4 is formed smaller than an unit length volume Vs of both ends side in the longitudinal direction, and the front plate 1 is placed on the blade 2 to bring them into contact with each other. Then, an energy is applied so that temperature rises while exerting an appropriate pressing force between them, thereby the acute projection ridge 4 is melted and the front plate 1 is welded onto the blade 2. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
