Coiling machine and coil spring manufacturing method

A coiling machine comprising:

• a feed unit configured to feed a wire in a feed direction;
• a helix formation unit configured to bend the wire fed by the feed unit in a perpendicular direction orthogonal to the feed direction in series, thereby forming a coil spring extending into a helical shape toward a formation direction orthogonal to the feed direction and the perpendicular direction;
• a laser heater configured to heat a portion of the wire by emitting laser light to the wire which is bent by the helix formation unit;
• and
• a cutting unit configured to cut a site of the wire heated by the laser light, wherein
• when, relative to an irradiation area irradiated with the laser light in the wire, the perpendicular direction is defined as 0°, and the formation direction is defined as 90°, an irradiation direction of the laser light by the laser heater forms a second angle which is greater than or equal to 5° and less than or equal to 80° with the perpendicular direction.

A coil spring manufacturing method comprising:

• feeding a wire in a feed direction;
• bending the fed wire in a perpendicular direction orthogonal to the feed direction in series, thereby forming a coil spring extending into a helical shape toward a formation direction orthogonal to the feed direction and the perpendicular direction;
• heating a portion of the wire by emitting laser light to the bent wire;
• and
• cutting a site of the wire heated by the laser light, wherein
• when, relative to an irradiation area irradiated with the laser light in the wire, the formation direction is defined as 0°, and an opposite side of the feed direction is defined as 90°, and an opposite side of the formation direction is defined as 180°, and the feed direction is defined as 270°, an irradiation direction of the laser light forms a first angle which is greater than or equal to 0° and less than or equal to 270° with the formation direction.

A coil spring manufacturing method comprising:

• feeding a wire in a feed direction;
• bending the fed wire in a perpendicular direction orthogonal to the feed direction in series, thereby forming a coil spring extending into a helical shape toward a formation direction orthogonal to the feed direction and the perpendicular direction;
• heating a portion of the wire by emitting laser light to the bent wire;
• and
• cutting a site of the wire heated by the laser light, wherein
• when, relative to an irradiation area irradiated with the laser light in the wire, the perpendicular direction is defined as 0°, and the formation direction is defined as 90°, an irradiation direction of the laser light forms a second angle which is greater than or equal to 5° and less than or equal to 80° with the perpendicular direction.