Helical part manufacturing apparatus and control method thereof

An apparatus for manufacturing a helical part by feeding a wire toward a tool and pushing the wire against the tool to forcibly wind the wire, comprising:

• a feed roller for feeding the wire toward the tool;
• a roller driving unit for rotatably driving said feed roller;
• at least one tool holding unit which slidably holds the tool toward a forming space;
• a cutting unit, which holds a discoid grindstone rotatable and movable toward the forming space, for cutting the wire by the rotating discoid grindstone;
• and
• a control unit for controlling said roller driving unit and said cutting unit to move the discoid grindstone along a plane which is substantially perpendicular to a coil growing direction of the helical part and to cut the wire in a direction which is substantially perpendicular to the coil growing direction;
• wherein said tool holding units are arranged vertically in a manner that upper tool and lower tool are arranged at an angle of 45° with respect to the wire feeding direction and that a rotation center of the discoid grindstone is sandwiched between the upper and lower tools, and
• said cutting unit is arranged in a manner that the discoid grindstone is positioned opposite to the wire feeding direction and the rotation center of the grindstone matches a center of the coil diameter of the helical part.