| 摘要 |
PURPOSE:To reduce internal strain, improve molding accuracy as well as workability and secure the good function of a spring receiver by a method wherein the position of a gate for pouring resin is set at the tip end part of a spring receiving boss and injection molding is performed, thereafter, the spring receiving boss is melted by heat and the trace of the gate is eliminated to reform smooth. CONSTITUTION:The position of a spring receiving boss 6, provided at the center of the outer surface of the axial one end of a cylindrical section 2 of a reel is set at a gate G. After molding the cylindrical section 2 of the reel, the spring receiving boss 6 is melted by heat to eliminate and reform the trace (a) of the gate smoothly. Here, a supersonic horn 18, having a recess 19 coinciding with the predetermined configuration of the sumit of the spring receiving boss 6, is employed as a means to eliminate and reform the trace (a) of the gate smooth by thermal fusion so as to be capable of generating heat in a very short period of time and effecting the melting and reforming works efficiently. On the other hand, in case a fusion welding pin 7 is projectedon an end surface having the spring receiving boss 6 of the cylindrical section 2 of the reel and is bonded to an upper flange 3 through caulking and fusion welding, the same supersonic horn 18 or a hot plate is employed for both works so that the caulking and fusion welding works of the fusion weldin pin 7 can be effected simultaneously with the eliminating and reforming works of the trace of the gate for the boss 6. |
