| 摘要 |
To provide a spacer nut manufacturing method which uses no NC lathe, which allows machining using existing press working equipment, which involves a low parts supply cost, and which helps to achieve a high production efficiency at a low production cost. A method of manufacturing a spacer nut arranged between a casing and a board arranged inside the casing and serving to fix the board in position while keeping the board spaced apart from the casing by a predetermined distance dimension, the method comprising: a first step of forming a protrusion of a predetermined length on a metal plate material of a predetermined thickness dimension by press working; a second step of forging the protrusion into a shaft portion in the form of a bottomed cylinder and forming a flange portion at a peripheral edge of a proximal end portion of the shaft portion by press working; a third step of forming an opening at a distal end portion of the shaft portion by press working; a fourth step of performing pressing radially inwards on the proximal end portion of the shaft portion to form a groove portion extending circumferentially around the shaft portion; a fifth step of stamping the flange portion from the metal plate material while forming a serration portion along an outer periphery of the flange portion by press working; and a sixth step of forming a thread groove portion in an inner peripheral surface portion of the shaft portion. |
