| 摘要 |
PURPOSE:To form a spring of high accuracy at a low cost by irradiating laser light to the circumferential wall of a tubular blank material consisting of a spring material and displacing the blank material and the laser light focused part relatively thereby removing the circumferential wall part corresponding to a groove. CONSTITUTION:Various necessary conditions including the pitch and number of turns of a coil spring (a), the width of a groove C, the position of a working start point, etc. are beforehand set in a control section 10. Arrangement is so made that the output signals of an angle detector (not shown) detecting the rotating position of a rotary table 2 of a rotating and driving section and a position detector (not shown) detecting the position of the elevating shaft 4 of an elevating and driving section 3 are conducted to the control section. According to the command signal for working start, a reflecting mirror 5 is moved to the working start point by the section 3 and the shaft 4 and the elevating position of the mirror 5 and the rotating position of a tubular blank material (b) are driven and controlled by the section 10 in accordance with the various preset conditions, In this way, the circumferential wall part of the material (b) is penetrated by the focusing part 9 of laser light 7 to form the groove C, whereby the spring (a) is produced. |
