# US 2021/0239398 A1 · Heat treatment furnace, heating device, manufacturing method of wire electrode and heat diffusion treatment method

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- Number: US 2021/0239398 A1
- Document ID: US20210239398A1
- Status: Published application
- Kind: A1
- Application number: 17/160,391
- Filed: 2021-01-28
- Published: 2021-08-05
- Earliest claimed: 2020-01-30
- Assignees: Sodick Co., Ltd.
- Applicants: Sodick Co., Ltd.
- Inventors: Tetsuro Kawahara; Tomoaki Asaoka; Masaru Nakamura
- Web page: https://patentgrep.com/patent/US20210239398A1

## CPC

- F27B 9/28: for treating continuous lengths of work
- F27B 9/062: {electrically heated}
- F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS

## Abstract

The disclosure is a heat treatment furnace which heats an element wire for a wire electrode to perform a heat diffusion treatment and includes: first, second and third rotary electrodes to which a voltage is applied; a motor that rotationally drives the rotary electrodes; and a control device. The first, second and third rotary electrodes 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. The element wire is caused to travel, a voltage is applied to the first, second and third rotary electrodes, and a current flows through and heats the element wire which travels in a first heating section and a second heating section.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The heat treatment furnace according to claim 1, wherein a dancer roller device is arranged on a travel path of the element wire, and the control device detects the position of the dancer roller device and controls the rotation of the motor.

### Claim 3 (depends on 1)

The heat treatment furnace according to claim 1, wherein a heat insulation cover is arranged in the first heating section and the second heating section.

### Claim 4 (depends on 1)

A heating device, comprising: the heat treatment furnace according to claim 1, a delivery device for delivering the element wire to the heat treatment furnace, and a winding device for winding a heat treatment wire discharged from the heat treatment furnace.

### Claim 5

A manufacturing method of a wire electrode, in which an element wire used for a wire electrode is heated and subjected to a heat diffusion treatment,
wherein the element wire travels on a V-shaped or an I-shaped path formed by laying in an order of a second rotary electrode, a first rotary electrode and a third rotary electrode, and the element wire is heated and subjected to the heat diffusion treatment by causing a current to flow through the element wire 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.

### Claim 6

A heat diffusion treatment method, in which an element wire used for a wire electrode is heated and subjected to a heat diffusion treatment,
wherein the element wire travels on a V-shaped or an I-shaped path formed by laying in an order of a second rotary electrode, a first rotary electrode and a third rotary electrode, and the element wire is heated and subjected to the heat diffusion treatment by causing a current to flow through the element wire 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.