Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Manufacturing method of grain oriented electrical steel sheet

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, photographic plate-making process of patterned surface, and magnetism of inorganic materials, etc., can solve problems such as generation of burrs, inhibition of etching speed, huge etching equipment, etc., achieve good iron loss, maintain The effect of iron loss

Active Publication Date: 2019-03-15
JFE STEEL CORP
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these methods, there is a problem that burrs are generated around the groove, and a process for removing burrs is required.
[0007] However, in the method described in Patent Document 3, there is a limit to the speed of chemical etching, so when trying to increase the line speed for the purpose of improving productivity, there is a problem that the etching equipment becomes too large.
In addition, if the concentration of Fe ions dissolved in the acid used for etching increases, the etching rate is suppressed, so there is also a problem that it is difficult to form grooves of uniform shape in the longitudinal direction of the coil.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Manufacturing method of grain oriented electrical steel sheet
  • Manufacturing method of grain oriented electrical steel sheet
  • Manufacturing method of grain oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] A steel slab containing Si: 3.0% by mass, C: 0.05% by mass, Mn: 0.03% by mass, Al: 0.02% by mass, N: 0.01% by mass, with the remainder consisting of Fe and unavoidable impurities is heated at 1400°C Afterwards, hot rolling is carried out to form a plate thickness of 2.2 mm, after implementing hot-rolled plate annealing at 1100 ° C × 60 seconds, cold rolling is carried out to make the plate thickness 1.8 mm, after implementing intermediate annealing at 1100 ° C × 60 seconds, use the first Secondary cold rolling to form a final plate thickness of 0.23 mm.

[0100] The cold-rolled steel sheets obtained as described above were subjected to magnetic domain refining treatment by various methods shown in Table 2.

[0101] Here, in the gravure offset printing, the grid provided on the plate roll is set so that the uncoated parts extending in the width direction of the plate with a width of 100 μm are arranged at a pitch of 3 mm in the rolling direction. Epoxy-based resists are...

Embodiment 2

[0113] Various resists shown in Table 3 were applied to the same cold-rolled steel sheet coils as those produced in Example 1. Here, a resist other than gravure offset printing was uniformly coated on the surface of a steel sheet by a roll coater, and the light source shown in Table 3 and a mask formed with a slit or a shielding portion with a width of 100 μm were used to apply the resist through a mirror. The projection type of the optical system of the lens carries out exposure. The projection magnification is set to equal magnification.

[0114] Then, the steel sheet coated with the chemically amplified resist was heat-treated at 80° C. for 30 seconds. Next, development is performed with a developer suitable for the resist. For gravure offset printing, a plate roll having uncoated portions with a width of 100 μm formed at a pitch of 3 mm in the rolling direction was produced, and an epoxy resin was printed on the surface of the steel sheet.

[0115] These steel sheets we...

Embodiment 3

[0120] On the same cold-rolled steel sheet coil as the coil produced in Example 1, roll-coat a positive-type resist with a novolac resin and a naphthoquinonediazide photosensitive agent as main components with a film thickness of 3 μm, and implement Heat treatment at 100°C x 30 seconds. Then, exposure was performed on one side of the steel plate under various conditions by using three exposure methods: proximity mask, projection type, and direct drawing type.

[0121] In the proximity mask, a mask with slits of 100 μm width extending in the sheet width direction was made at a pitch of 5 mm in the rolling direction, and the distance between the mask and the steel sheet was changed in the range shown in Table 4, Use illuminance of 50mW / cm 2 A 3-second exposure was performed using an ultra-high pressure mercury lamp.

[0122] In the projection type, a plurality of masks are produced in such a way that a region extending in the width direction of the steel plate with a width of ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
current densityaaaaaaaaaa
Login to View More

Abstract

The present invention provides a method for producing a grain-oriented electrical steel sheet capable of achieving both good iron loss and high productivity. In groove formation for magnetic domain refinement, a resist containing a photosensitive resin is applied, exposed and developed, thereby forming a linear exposed portion of the steel base, and in the subsequent electrolytic etching, the connection When the current of the electrode is I, and the area of ​​the steel base exposed portion on the surface of the steel plate having the same area as the electrode is S, the current density ρ=I / S to the steel base exposed portion is 7.5 A / cm 2 above.

Description

technical field [0001] The present invention relates to a method for producing a grain-oriented electrical steel sheet subjected to magnetic domain refinement treatment, and more particularly to a production of a grain-oriented electrical steel sheet that is efficiently subjected to magnetic domain refinement treatment capable of withstanding stress relief annealing and has excellent iron loss after the treatment method. Background technique [0002] A grain-oriented electrical steel sheet is a soft magnetic material widely used as an iron core of a transformer or the like. A grain-oriented electrical steel sheet is required to have low iron loss in order to minimize energy loss when used as an iron core. [0003] As one of the methods for reducing the iron loss of the steel sheet, there is a method of using a phenomenon called secondary recrystallization to concentrate the orientation of the crystals in the steel sheet to a high degree in the Goss (Goss) orientation ({110}...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/06C21D8/12G03F7/023G03F7/027G03F7/031G03F7/033G03F7/038G03F7/039G03F7/40H01F1/16C22C38/00C22C38/06
CPCC21D8/12C25F3/06C22C38/00C22C38/06G03F7/023G03F7/027G03F7/031G03F7/033G03F7/038G03F7/40H01F1/16C21D8/1294C21D2201/05G03F7/039C21D8/1272C21D8/1277C21D9/46C22C38/001C22C38/004C22C38/02C22C38/04C21D8/1222C21D8/1233C25F3/14C21D6/005C21D6/008C21D8/005C21D8/1266G03F7/022G03F7/20G03F7/325
Inventor 末广龙一寺岛敬
Owner JFE STEEL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com