US 11,835,294 B2
Heat treatment furnace, heating device, manufacturing method of wire electrode and heat diffusion treatment method
Tetsuro Kawahara, Kanagawa (JP); Tomoaki Asaoka, Kanagawa (JP); and Masaru Nakamura, Kanagawa (JP)
Assigned to Sodick Co., Ltd., Kanagawa (JP)
Filed by Sodick Co., Ltd., Kanagawa (JP)
Filed on Jan. 28, 2021, as Appl. No. 17/160,391.
Claims priority of application No. 2020-013123 (JP), filed on Jan. 30, 2020.
Prior Publication US 2021/0239398 A1, Aug. 5, 2021
Int. Cl. F27B 9/28 (2006.01); F27B 9/06 (2006.01)
CPC F27B 9/28 (2013.01) [F27B 9/062 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A heat treatment furnace, which moves an element wire having been zinc-galvanized at a predetermined speed and heats the element wire to perform a heat diffusion treatment, comprising:
a first rotary electrode, a second rotary electrode and a third rotary electrode to which a voltage is applied; a motor that rotationally drives the first rotary electrode, the second rotary electrode and the third rotary electrode; and a control device;
wherein the first rotary electrode, the second rotary electrode and the third rotary electrode are arranged in a manner that the element wire is laid in a V-shape or an I-shape in an order of the second rotary electrode, the first rotary electrode and the third rotary electrode from the upstream side in a travel direction of the element wire;
wherein the motor is driven according to a command from the control device to cause the element wire to travel, a voltage is applied to the first rotary electrode, and a voltage having a sign opposite to that of the first rotary electrode is applied to the second rotary electrode and the third rotary electrode; and
wherein a current flows through and heats the element wire which travels in a first heating section between the second rotary electrode and the first rotary electrode and in a second heating section between the third rotary electrode and the first rotary electrode,
wherein the heat treatment furnace further comprises cooling covers arranged on peripheries of the first rotary electrode, the second rotary electrode and the third rotary electrode, respectively,
wherein each of the cooling covers comprises a pipeline for circulating a cooling medium, the control device circulating the cooling medium in the pipeline by a cooling pump and cooling the first rotary electrode, the second rotary electrode and the third rotary electrode and during cooling medium circulation, the heat treatment furnace is configured to not directly cool the element wire,
wherein the heat treatment furnace further comprises a first temperature sensor and a second temperature sensor, the first temperature sensor being arranged in a vicinity of the first heating section or the second heating section of a travel path of the element wire and detecting a temperature of the element wire, the second temperature sensor being attached to the first rotary electrode, the second rotary electrode or the third rotary electrode and detects a temperature of the first rotary electrode, the second rotary electrode or the third rotary electrode,
wherein the control device controls an application voltage applied to the first rotary electrode, the second rotary electrode, and the third rotary electrode by the temperatures detected by the first temperature sensor and the second temperature sensor.