Apparatus for treating magnetic wire and method for treating the same

Patent metadata

Field	Value
Publication number	US-10253393-B2
Application number	US-201715709133-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Jun 14, 2017
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

Method for heat treating magnetic wire includes a wire supply unit, a wire property measuring unit, a wire tensile force measuring unit, a heat treatment unit, and a wire winding unit. The wire supply unit includes a supply bobbin, a supply rotary part, a wire reel, and a tension roller. The wire property measuring unit includes a size measuring device, an after measurement capstan, and a wire reel and measures a size of the wire prior to the heat treatment. The wire tensile force measuring unit includes a tensile force measuring device, a tension roller, and a wire reel. The wire heat treatment unit includes a heat treatment furnace, a temperature measuring device, an after heat treatment capstan, and a wire reel. The wire winding unit includes a winding bobbin, a winding rotary part that rotates the winding bobbin, a tension roller, and a wire reel.

First claim

What is claimed is:

1. A method of heat treating a magnetic wire, comprising:
providing apparatus comprising;
a wire supply unit comprising a supply bobbin, around which the magnetic wire to be heat treated is wound, a supply rotary part that rotates the supply bobbin, a wire reel, and a tension roller,
a wire property measuring unit comprising a size measuring device, an after measurement capstan, and a wire reel and measuring a size of the wire prior to heat treatment,
a wire tensile force measuring unit comprising a tensile force measuring device, a tension roller, and a wire reel,
a wire heat treatment unit comprising a heat treatment furnace, a temperature measuring device, an after heat treatment capstan, and a wire reel,
a wire winding unit comprising a winding bobbin, around which the heat treated magnetic wire is wound, a winding rotary part that rotates the winding bobbin, a tension roller, and a wire reel, and
a control unit comprising a processor and a memory,
wherein the control unit is configured to receive signals indicative of the size of the magnetic wire measured by the size measuring device, a tensile force of the magnetic wire measured by the tensile force measuring device, a temperature of the heat treatment furnace measured by the temperature measuring device and signals from the capstans, and configured to send control signals to the capstans and the tension rollers, and
the control unit is configured to control the apparatus so that the tensile force applied to the magnetic wire between the supply bobbin and the winding bobbin is adjusted using the tension rollers, and a winding speed of the winding bobbin is adjusted using the after measurement capstan and the after heat treatment capstan, so that the temperature, a conveyance speed in the heat treatment furnace and a stress induced in the magnetic wire in the furnace are maintained in respective predetermined ranges;

supplying the magnetic wire from the supply bobbin by using the capstans; and
transferring the supplied magnetic wire through the wire property measuring unit, the wire tensile force measuring unit, and the wire heat treatment unit to the winding bobbin, which is attached to the winding rotary part that can adjust a feed speed, using the wire reels, the capstans, the tension rollers, wherein
a diameter of the magnetic wire is measured at the wire property measuring unit, the tensile force of the magnetic wire is measured at the wire tensile force measuring unit, a heat treatment temperature is measured at the wire heat treatment unit, and the speed of winding the magnetic wire is measured at the wire winding unit,
the control unit receives respective measured values and sends the control signals to the capstans and the tension rollers, and
based on the respective measured values and the signals from the capstans, the control unit controls the apparatus so that the temperature of the magnetic wire in the furnace is maintained at a temperature in a range of 400° C. to 550° C., the stress induced in the magnetic wire in the furnace is maintained at a stress in a range of 50 to 250 MPa, and the feed speed is maintained at a speed in a range of 1 to 100 meter per minute.

2. The method of claim 1 , wherein the wire property measuring unit is configured to measure, when the magnetic wire includes an insulating layer covering the magnetic wire, both a diameter of the whole magnetic wire with the insulating layer and a diameter of the magnetic wire without the insulating layer.

3. The method of claim 1 , wherein the feed speed is maintained at a speed in a range of 1 to 10 meters per minute.

4. The method of claim 2 , wherein the feed speed is maintained at a speed in a range of 1 to 10 meters per minute.

5. A method of heat treating a magnetic wire, comprising:
pulling out a first portion of the magnetic wire from a wire supply by using a capstan;
prior to a heat treatment of the first portion of the magnetic wire,
measuring a diameter of the first portion of the magnetic wire,
determining a target tensile force to be applied to the first portion of the magnetic wire based on the measured wire diameter,
measuring an actual tensile force applied to the first portion of the magnetic wire,
adjusting, by using a tension roller that is controlled by a control unit comprising a processor and a memory, a tension load applied by the tension roller and a feed speed of the first portion of the magnetic wire, by using the capstan, so that the target tensile force and the actual tensile force become equal within a measurement accuracy of the measuring of the actual tensile force;

heat treating the first portion of the magnetic wire at a predetermined temperature; and
winding up the first portion of the magnetic wire after the heat treating by using a bobbin.

Assignees

• Aichi Steel Corp

Inventors

• Hamada Norihiko
• Shimode Akihiro

Classifications

• C21D11/00 Primary

  Process control or regulation for heat treatments · CPC title

• F27D2003/0034

  Means for moving, conveying, transporting the charge in the furnace or in the charging facilities · CPC title

• F27D21/00

  Arrangement of monitoring devices; Arrangement of safety devices · CPC title

• F27D2019/0003

  Monitoring the temperature or a characteristic of the charge and using it as a controlling value · CPC title

• C21D9/525

  for wire, for rods (C21D9/54 takes precedence) · CPC title