METHOD FOR ELECTRICALLY HEATING SPRING, AND DEVICE FOR SAME

摘要

A method for heating the entire spring including the vicinities of electrodes by a single electrical heating process is provided. This method has a step of causing at least a pair of electrodes to make contact with a spring, and a step of electrically heating the spring by applying a voltage between the pair of electrodes contacting the spring. Each of the electrodes has a first part 18a having a first electric resistance value and a second part 20 having a second electric resistance value higher than the first electric resistance value. The second part 20 may have an electric resistance value approximately the same as that of the spring to be heated. When electrically heating the spring, the temperature of the second part is raised to approximately the same temperature as that of the spring, thereby heating the vicinities of the sections of the spring that come into contact with the electrodes.