A compression coil spring includes a steel wire material containing, hereinafter in weight %, 0.5 to 0.7% of C, 1.2 to 3.0% of Si, 0.3 to 1.2% of Mn, 0.5 to 1.9% of Cr and 0.05 to 0.5% of V as necessary components, one or more kinds selected from not more than 1.5% of Ni, not more than 1.5% of Mo and not more than 0.5% of W as freely selected components, and iron and inevitable impurities as the remainder; the C-condensed layer which exceeds the average concentration of C contained in the steel wire material exists at a surface layer part, and the thickness of the C-condensed layer is within 0.01 to 0.05 mm along the entire circumference of the steel wire material.

A servo-rotating all-function tool module is provided for use with a spring forming machine and includes an axle rotating tool module and a servo transmission module assembly. The axle rotating tool module is rotatably mounted, in combination with an axle of the rotary axle assembly of the spring forming machine, to a front wall board and includes an oscillating base and a tool. The oscillating base is rotatably mounted to the rotary axle assembly. The tool is mounted to an end of the oscillating base. The servo transmission module assembly is mounted to the spring forming machine and includes a servo moving ring circumferentially surrounding the oscillating base for driving the oscillating base to oscillate in all directions to thereby cause the tool to press down or lift upward.

A servo-rotating all-function tool module is provided for use with a spring forming machine and includes an axle rotating tool module and a servo transmission module assembly. The axle rotating tool module is rotatably mounted, in combination with an axle of the rotary axle assembly of the spring forming machine, to a front wall board and includes an oscillating base and a tool. The oscillating base is rotatably mounted to the rotary axle assembly. The tool is mounted to an end of the oscillating base. The servo transmission module assembly is mounted to the spring forming machine and includes a servo moving ring circumferentially surrounding the oscillating base for driving the oscillating base to oscillate in all directions to thereby cause the tool to press down or lift upward.

A coiling machine includes a material guide, first pin, second pin, pitch tool, cutting tool, heating device, temperature sensor, and controller. A material is bent between the first pin and the second pin to form an arc part between the first pin and the second pin. The controller select control data corresponding to the temperature of the material from a plurality of control data corresponding to a processing temperature. Then, the positions of the first pin and the second pin are controlled such that a radius of curvature of the arc part increases when the temperature of the material increases, and the position of the cutting tool is controlled such that a gap between the center of curvature of the arc part and the cutting tool increases.

A coiling machine includes a material guide, first pin, second pin, pitch tool, cutting tool, heating device, temperature sensor, and controller. A material is bent between the first pin and the second pin to form an arc part between the first pin and the second pin. The controller select control data corresponding to the temperature of the material from a plurality of control data corresponding to a processing temperature. Then, the positions of the first pin and the second pin are controlled such that a radius of curvature of the arc part increases when the temperature of the material increases, and the position of the cutting tool is controlled such that a gap between the center of curvature of the arc part and the cutting tool increases.

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.

A coiling machine includes feed rollers for moving a wire, a wire guide, a first forming roller, a second forming roller, a pitch tool, a cutting mechanism, and a support mechanism for supporting the wire. The cutting mechanism includes a cutting rotor. The wire coming out of the wire guide is formed into a helical shape by the first forming roller, the second forming roller and the pitch tool. After one coil spring of a predetermined length is formed, the wire is cut by moving the cutting rotor in the radial direction of the wire. The cutting rotor cuts the wire supported by the support mechanism in the radial direction of the wire between the second forming roller and the pitch tool.

A coiling machine includes feed rollers for moving a wire, a wire guide, a first forming roller, a second forming roller, a pitch tool, a cutting mechanism, and a support mechanism for supporting the wire. The cutting mechanism includes a cutting rotor. The wire coming out of the wire guide is formed into a helical shape by the first forming roller, the second forming roller and the pitch tool. After one coil spring of a predetermined length is formed, the wire is cut by moving the cutting rotor in the radial direction of the wire. The cutting rotor cuts the wire supported by the support mechanism in the radial direction of the wire between the second forming roller and the pitch tool.

A control method and a device for a cutter shaped by a helical spring includes two controlling apparatuses (20) connected to two coil spring bending tools (10) respectively and including a lifting apparatus (30). The two controlling apparatuses (20) are arranged in the same assembly platform (40). The controlling apparatus (20) controls an amount of displacement of the stretching and retracting of the two coil spring bending tools (10). The amount of displacement of the coil spring bending tools (10) and the amount of up and down movement of the assembly platform (40) are controlled simultaneously by a motor (50). By applying the concept of relative coordinates, the requirements of control can be simplified from two two-dimensional control movements to three single-axis linear movements by using the coordinate of the center point (P3) of a spring coil as the origin of the coordinates for the movement of the spring outer diameter cutter. In the case that the distances of linear movement on the three axes are identical or at a fixed ratio, the advantage of reducing the number of motors is achieved.