A coil spring manufacturing device includes a mandrel around which a wire is wound, a feed mechanism which feeds the wire toward the mandrel, guide members which guide the wire, a chuck which fixes a distal end of the wire, and a clamp mechanism. The clamp mechanism sandwiches the wire from both sides before the distal end of the wire reaches the mandrel. Further, the clamp mechanism can be rotated about a fulcrum by rotation actuator, and can also be slid in a direction along an axis of the mandrel by sliding actuator. In a state in which the wire is sandwiched by the clamp mechanism, the clamp mechanism is rotated, and if necessary, is slid. Thereby, a bent portion for a negative pitch portion of a coil spring is formed at a part of the wire.

The present invention is provided focusing on a servo press configured to enable high-speed/high-accuracy operation by numeric value control in the method for manufacturing an arc-shaped coil spring. The present invention provides a manufacturing method and a manufacturing device configured so that the curvature of the arc-shaped coil spring can be freely ensured. The manufacturing method includes the clamp step of fixing a straight cylindrical coil spring, the end portion detection step of detecting an end portion, a rotation angle position determination step, a pitch feeding step, a pressing member insertion step, and an insertion direction conversion step. The manufacturing method and the manufacturing device relate to the technology of continuously repeating the operation of pushing down a pressing member to an inter-pitch from above, thereby deforming the straight cylindrical coil spring into the coil spring with the curvature.

The present invention is provided focusing on a servo press configured to enable high-speed/high-accuracy operation by numeric value control in the method for manufacturing an arc-shaped coil spring. The present invention provides a manufacturing method and a manufacturing device configured so that the curvature of the arc-shaped coil spring can be freely ensured. The manufacturing method includes the clamp step of fixing a straight cylindrical coil spring, the end portion detection step of detecting an end portion, a rotation angle position determination step, a pitch feeding step, a pressing member insertion step, and an insertion direction conversion step. The manufacturing method and the manufacturing device relate to the technology of continuously repeating the operation of pushing down a pressing member to an inter-pitch from above, thereby deforming the straight cylindrical coil spring into the coil spring with the curvature.

Method for press-rolling a mainspring, from a wire comprising a pre-formed eye, utilizing a roller press comprising a first support and guide means exerting a force on the wire in a first contact area located between a second and a third contact area comprised in a second and a third support and guide means, in order to wind, beyond the eye, an accumulation area with an opposite curvature to that of the eye, and wherein, as the wire advances, the position of the first contact area is gradually moved away from the second and third contact areas, to vary the press-rolling radius from a first minimum value to a second maximum value at a neck junction between the accumulation area and the eye.

A hollow coil spring is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.

A method for forming a wire into a coil spring includes winding the wire around a coiling mandrel to form the wire into a cylindrical coil shape, clamping one end of the wire formed into the cylindrical coil shape, clamping an intermediate portion of the wire spaced from the clamped one end of the wire; and moving the clamped one end of the wire relative to the clamped intermediate position at least in an axis direction of the cylindrical coil shape, whereby a pigtail having a desired shape is formed.

A method for forming a wire into a coil spring includes winding the wire around a coiling mandrel to form the wire into a cylindrical coil shape, clamping one end of the wire formed into the cylindrical coil shape, clamping an intermediate portion of the wire spaced from the clamped one end of the wire; and moving the clamped one end of the wire relative to the clamped intermediate position at least in an axis direction of the cylindrical coil shape, whereby a pigtail having a desired shape is formed.

The coil spring manufacturing device includes a first continuous material mounting portion, a second continuous material mounting portion, a straightener, a cutter, a short material mounting portion, and a coiling machine. The material reeled out from a first continuous material or a second continuous material is cut by the cutter. The coil spring manufacturing device can switch a process among a first continuous material coiling process of manufacturing a coil spring by using the first continuous material, a second continuous material coiling process of manufacturing a coil spring by using the second continuous material, and a short material coiling process of manufacturing a coil spring by using the short material.

The coil spring manufacturing device includes a first continuous material mounting portion, a second continuous material mounting portion, a straightener, a cutter, a short material mounting portion, and a coiling machine. The material reeled out from a first continuous material or a second continuous material is cut by the cutter. The coil spring manufacturing device can switch a process among a first continuous material coiling process of manufacturing a coil spring by using the first continuous material, a second continuous material coiling process of manufacturing a coil spring by using the second continuous material, and a short material coiling process of manufacturing a coil spring by using the short material.

Provided is a bending device that includes a processing part having two protruding parts that protrude from an end surface of a pillar part and that bend a wire, a rotary part that supports the processing parts and rotates about an axis intersecting the length direction of the pillar part, an accommodating part that is cylindrical and accommodates the rotary part at an end part of the accommodating part so as to be rotatable, and a mechanism that rotates the accommodating part about an axis of the accommodating part.