CN113211325A - Method for preparing non-bottom-layer raw material of oriented silicon steel thin strip in physical sand blasting mode - Google Patents
Method for preparing non-bottom-layer raw material of oriented silicon steel thin strip in physical sand blasting mode Download PDFInfo
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- CN113211325A CN113211325A CN202110494444.5A CN202110494444A CN113211325A CN 113211325 A CN113211325 A CN 113211325A CN 202110494444 A CN202110494444 A CN 202110494444A CN 113211325 A CN113211325 A CN 113211325A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
- B24C7/0069—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with means for preventing clogging of the equipment or for preventing abrasive entering the airway
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1238—Flattening; Dressing; Flexing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a method for preparing a non-bottom raw material of an oriented silicon steel strip in a physical sand blasting mode, which comprises the following steps: s1, blank pretreatment; s2, coating a release agent, and then carrying out high-temperature annealing; s3, stretching and hot leveling; s4, performing surface sand blasting treatment to remove the bottom layer; s5, stress relief annealing; the method has the advantages that the physical method of sand blasting is adopted to prepare the non-bottom raw material of the oriented silicon steel strip, the traditional method of removing the oriented silicon steel coating or the magnesium silicate bottom layer by acid is replaced, and the annealing stress removal is combined, so that the processing quality is obviously improved, the whole processing process is more environment-friendly, and the cost control is facilitated.
Description
Technical Field
The invention relates to the technical field of oriented silicon steel production, in particular to a method for preparing a non-bottom raw material of an oriented silicon steel thin strip in a physical sand blasting mode.
Background
Oriented silicon steel, also known as electrical steel, is an important ferrosilicon alloy material indispensable to the power, electronic and military industries of important ferrosilicon alloy applied to the manufacturing industry of transformers (iron cores), and has complex production process and strict manufacturing technology. The common production process comprises purchasing blanks, performing surface pretreatment, annealing for multiple times, cold rolling and stretching, coating an isolating agent in the process, performing high-temperature annealing to purify steel, forming a magnesium silicate glass bottom layer, improving the magnetic property, and finally, stretching, thermally flattening and coating an insulating coating. However, in the process of processing raw materials without a bottom layer, the traditional method for removing the surface coating and the magnesium silicate glass bottom layer formed in high-temperature annealing adopts acid cleaning (hydrochloric acid + ammonium fluoride) or special release agent coating to prevent the formation of the magnesium silicate glass bottom layer. The two common methods have the following problems respectively:
1. the oriented silicon steel strip prepared by acid washing has no bottom raw material, has larger pollution and is not environment-friendly;
2. the application of the special separant does not form a magnesium silicate bottom layer, so that the process is complex, the cost is high, and the effect is not easy to control.
In the existing improved technology, in order to reduce the acid washing step, an improved method of carrying out sand blasting/shot blasting at the surface pretreatment stage is adopted, and the first acid washing step in the original oxide removal process is replaced, for example, an oriented silicon steel plate strip acid-free cleaning line of Chinese patent CN209631822U, the improved technology comprises an uncoiler, a welding platform, an electric ion cutting machine, a centering device, at least one centrifugal shot blasting machine, a cleaning pool, a brushing device, a passivation pool, a drying device, a clamping and conveying machine, an electric ion cutting machine and a winding machine which are sequentially connected from front to back; and a steering roller is also arranged between two adjacent devices. The technical scheme belongs to a method for replacing acid washing with shot blasting aiming at the surface treatment of the initial blank. However, no effective method for mechanical removal of the magnesium silicate glass bottom layer exists at the present stage, and the main reason is that the quality requirement for surface removal in the process step is high, and meanwhile, the traditional mechanical removal means can cause residual stress to remain on the surface and does not meet the processing requirement.
Disclosure of Invention
In view of the above, the invention provides a method for preparing a non-bottom-layer raw material of an oriented silicon steel strip by a physical sand blasting method, which can solve the above problems.
For this purpose, the present invention is implemented by the following technical means.
A method for preparing a non-bottom raw material of an oriented silicon steel thin strip in a physical sand blasting mode mainly comprises the following steps:
s1, blank pretreatment;
s2, coating a release agent, and then carrying out high-temperature annealing;
s3, stretching and hot leveling;
s4, performing surface sand blasting treatment to remove the bottom layer;
and S5, stress relief annealing.
Further, in S1, the billet pretreatment sequentially includes pickling and normalizing, cold rolling, and decarburization annealing.
Further, the cold rolling process adopts a multi-roller mill to roll the pickled blank to the thickness of 0.2mm-0.35 mm; the cold rolling procedure is single rolling or repeated rolling; wherein the first rolling thickness of the repeated rolling is 0.5mm-0.7 mm.
Furthermore, the dust generated in the S4 is recycled and sorted, and the waste material and the waste liquid after acid washing are mixed for treatment.
Further, in the step S3, the thickness of the steel strip after the drawing and hot leveling process is 0.2mm to 0.35 mm.
Further, in S4, the surface blasting is performed by a plurality of blasting machines connected in series, using a plurality of blasting machines.
Furthermore, in S4, the surface blasting is performed by two-stage blasting, and two blasting machines are connected in series; the two sand blasting machines are respectively a first sand blasting machine and a second sand blasting machine; the steel belt passes through the first sand blasting machine and the second sand blasting machine in sequence; the first sand blasting machine carries out surface rough machining, and the second sand blasting machine carries out surface finish machining.
Furthermore, the abrasive of the sand blasting machine is round sand or rhombic sand; the size of the abrasive is 100-300 meshes.
Furthermore, the sand blasting machine adopts a suction type sand blasting mechanism and comprises an air source system; the air compressor flow of the air source system is 10-40 cubic per minute, and the pressure is 0.2-0.8 Mpa.
Furthermore, the sand blasting machine is a swing type sand blasting machine, and a plurality of nozzles are respectively arranged above and below the steel belt; the pressure of the nozzle is 0.2MPa-0.6 MPa; the steel belt conveying speed is 0.5m/min-5 m/min.
The invention has the following advantages:
the invention adopts a physical method of sand blasting to prepare the non-bottom raw material of the oriented silicon steel strip, replaces the traditional method of removing the oriented silicon steel coating or the magnesium silicate bottom layer by acid, and combines annealing stress removal, thereby obviously improving the processing quality, ensuring the whole processing process to be more environment-friendly and being beneficial to controlling the cost.
Furthermore, the sand blasting process is improved into two-stage sand blasting, and the steel strip surface with the magnesium silicate bottom layer removed meets the composite processing requirement by controlling corresponding processing parameters, so that better quality control is realized; the waste material and the waste liquid are combined to be mixed for pollutant pretreatment, so that the treatment cost is reduced.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only one or several embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a flow chart of the preparation method of the present invention;
FIG. 2 is a front view of a blasting apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of the sand blasting apparatus in an embodiment of the invention;
FIG. 4 is a flow chart of the method for manufacturing the oriented silicon steel strip of the present invention.
In the figure:
1-a first sand blasting machine; 2-a second sand blasting machine; 3-discharging machine; 4-a winding machine; 5-a first dust removal box; 6-a second dust removal box; 7-water treatment tank.
Detailed Description
It should be noted that, in the case of no conflict, the features in the embodiments of the present application may be combined with each other.
The invention will be further explained with reference to the drawings.
A method for preparing a non-bottom raw material of an oriented silicon steel thin strip in a physical sand blasting mode is shown in figure 1 and mainly comprises the following steps:
s1, blank pretreatment; preferably, hot rolled blanks with the thickness of 2.0mm-3.0mm and the width of 1000mm-1300mm are purchased, then acid-washed to remove surface iron oxide, rolled by a multi-roll mill to the thickness of 0.2mm-0.35mm of finished products, and then subjected to decarburization annealing; wherein, according to different materials, a repeated rolling mode can be adopted in the cold rolling process, namely, the thickness is rolled to be 0.5mm-0.7mm for the first time, and then the thickness is rolled to be 0.2mm-0.35mm for the second time.
S2, coating a release agent, and then carrying out high-temperature annealing: the surface of the steel strip is coated with a separant, and then the steel strip is annealed at high temperature to purify the steel, so that a magnesium silicate glass bottom layer is formed, and the magnetic property is improved.
S3, stretching and hot leveling: stretching and hot leveling, keeping the thickness of the finished product to be 0.2-0.35 mm, winding into a finished steel coil with the width of 1000-1300 mm, and then slitting, wherein the slitting width is 500-650 mm.
S4, performing surface sand blasting treatment to remove the bottom layer: preferably, in order to realize accurate control, the surface sand blasting treatment is performed by selecting multi-stage sand blasting treatment, namely, a mode of serially processing a plurality of sand blasting machines is adopted, so that the processing technology is conveniently controlled, the processing surface precision is improved on one hand, the processing quality is conveniently controlled on the other hand, and further taking the two-stage sand blasting treatment as an example, the two sand blasting machines are serially connected to complete the processing; as shown in detail in conjunction with fig. 2 and 3;
in order to better understand the bottom layer removing processing steps of the invention, sand blasting process equipment is further introduced, and the sand blasting process equipment mainly comprises a feeding machine 3, a first sand blasting machine 1, a second sand blasting machine 2, a tension frame, a winding machine 4, a matched dust removal system (a first dust removal box 5 and a second dust removal box 6), a control system, an air compressor, a dryer, an air storage tank, a filter and the like.
The discharging machine 3 is mainly used for outputting raw materials and matching with sand blasting equipment to perform ordered discharging according to instructions of a control system.
The steel belt passes through the first sand blasting machine 1 and the second sand blasting machine 2 in sequence; wherein, the first sand blasting machine 1 carries out surface rough machining, and the second sand blasting machine 2 carries out surface finish machining.
The tension bracket is mainly used for orderly receiving materials by matching with the winding machine 4.
The dust removal system is mainly used for recovering, sorting and circulating dust in the sand blasting operation process and is an important component in the sand blasting system. Comprises a dry dust removal system and a water treatment system (a water treatment tank 7). Two sets of dry dust removal systems and a set of water treatment secondary filter system, each dust removal system comprises 380V5.5KW motors, 9 filter elements, a set of pulse dust removal system, 9 pulse valves and a set of sand-dust separator.
The control system is the core part of the equipment and orderly and effectively controls the whole equipment, and the control system of the machine consists of a PLC, a touch screen, a relay, a contactor, a button and the like.
Preferably, the sander abrasive is circular sand or diamond-shaped sand; the size of the abrasive is 100-300 meshes, and the specific size of the abrasive is increased along with the increase of the thickness of the finished product; the preferable range is 120 mesh to 150 mesh, and the mesh number is 120 mesh when the thickness is 0.2mm, and 150 mesh when the thickness is increased to 0.3mm, in the meantime, the selection is in line. The air source system mainly comprises an air compressor, a dryer, an air storage tank, a filter and the like. The method mainly has the functions of providing power for a sand blasting gun, continuously and stably blasting 100-200-mesh sand on the surface of the raw material, and removing a magnesium silicate bottom layer on the surface of the raw material to obtain the bottom-layer-free oriented silicon steel raw material. Preferably, the gas source requires: the flow of the air compressor is 10-40 cubic minutes, and the pressure is 0.2MPa-0.8 MPa.
The processing process comprises the following steps:
the non-bottom oriented silicon steel raw material passes through an infrared detection device in front of the discharging machine 3 and is continuously and stably discharged into the first sand blasting machine 1 by matching with sand blasting equipment according to the instruction of a control system. The sand blasting machine comprises 12 upper and lower 6 sand blasting guns in the first sand blasting machine 1, and the second sand blasting machine 2 also comprises 12 upper and lower 6 sand blasting guns, is matched with a sand blasting gun bracket 24 pair and four sets of synchronous swing systems, and each set of swing system comprises a 380V400W motor and four swing rods; preferably, the nozzle pressure is adjusted to 0.2MPa to 0.6 MPa. The conveying system is controlled by a servo motor, the sand blasting speed is adjusted to be 0.5m/min-5m/min, and the winding machine 4 passes through the tensioner to perform orderly continuous production.
Experiments show that under the process conditions, the surface of the raw material is bright after the raw material is treated by the two sand blasting machines, the subsequent processing requirements are met, and the problem of sand blasting the magnesium silicate bottom layer is solved.
S5, stress relief annealing: the non-bottom raw material of the oriented silicon steel after the sand blasting treatment has plastic deformation with different degrees, and stress generated by the sand blasting treatment needs to be eliminated through stress relief annealing.
The process completes the production and preparation process of the silicon steel strip without the bottom raw material.
The following processing steps are briefly described below (in conjunction with fig. 4):
s6, cold rolling: rolling the steel strip obtained in the step S5 to a finished product thickness of 0.03mm-0.1mm by adopting a multi-roller mill, and then slitting the steel strip into steel coils with the width of 200mm-320 mm;
s7, cleaning the surface;
s8, recrystallization annealing;
s9, coating an insulating coating: and coating the surface of the steel strip with an insulating coating liquid.
And finally, after the inspection is qualified, shearing according to the specification and packaging.
On the basis of the above embodiment, in order to further improve the treatment mode of the waste liquid and the dust, the dust generated in S4 is recovered and sorted by the dust removal system, the part which can be continuously used is recovered and recycled, and the waste material of the unusable part and the waste material with the surface removed is mixed with the waste liquid after the acid washing in the pretreatment stage, so that the waste liquid is consumed, the pollutant concentration is reduced, and the treatment cost is reduced.
Example 1
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.27mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh circular sand and the air pressure of a nozzle of 0.4Mpa to prepare the non-bottom oriented silicon steel raw material.
The effect is as follows: the surface is bright and smooth, and the plate type is smooth.
Example 2
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.27mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh diamond sand and the air pressure of a nozzle of 0.4Mpa to prepare the bottom-layer-free oriented silicon steel raw material.
The effect is as follows: the surface is dark and smooth, and the plate type is flat.
Example 3
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.27mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh circular sand and the air pressure of a nozzle of 0.2Mpa to prepare the bottom-layer-free oriented silicon steel raw material.
The effect is as follows: the surface is dark and smooth, and the plate type is flat.
Example 4
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.27mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh circular sand and the air pressure of a nozzle of 0.3Mpa to prepare the bottom-layer-free oriented silicon steel raw material.
The effect is as follows: the surface is dark and smooth, and the plate type is flat.
Example 5
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.27mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh circular sand and the air pressure of a nozzle of 0.6Mpa to prepare the non-bottom oriented silicon steel raw material.
The effect is as follows: the surface is bright and rough, and the plate shape is seriously deformed.
Example 6
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.27mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 120-mesh circular sand and the air pressure of a nozzle of 0.4Mpa to prepare the non-bottom oriented silicon steel raw material.
The effect is as follows: the surface is bright and rough, and the plate shape is smooth.
Example 7
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.27mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 180-mesh circular sand and the air pressure of a nozzle of 0.4Mpa to prepare the non-bottom oriented silicon steel raw material.
The effect is as follows: the surface is dark and smooth, and the plate type is flat.
Example 8
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.2mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 120-mesh circular sand and the air pressure of a nozzle of 0.4Mpa to prepare the non-bottom oriented silicon steel raw material.
The effect is as follows: the surface is bright and smooth, and the plate type is flat.
Example 9
On the basis of the specific implementation mode, the preparation method of the non-bottom oriented silicon steel raw material further comprises the following processing conditions:
feeding the oriented silicon steel raw material with the thickness of 0.35mm and the width of 590mm into a first sand blasting machine 1 and a second sand blasting machine 2, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh circular sand and the air pressure of a nozzle of 0.4Mpa to prepare the non-bottom oriented silicon steel raw material.
The effect is as follows: the surface is bright and smooth, and the plate type is flat.
Comparative example 1
The magnesium silicate bottom layer is removed by adopting the traditional acid washing (hydrochloric acid + ammonium fluoride) step without sand blasting and stress relief annealing, and the processing conditions are further selected as follows:
feeding the oriented silicon steel raw material with the thickness of 0.2mm and the width of 590mm into pickling equipment.
The effect is as follows: the surface is dark and rough, and the plate type is flat.
Comparative example 2
On the basis of the specific implementation mode, the sand blasting process adopts a single sand blasting machine for sand blasting treatment, and the processing conditions are further selected as follows:
feeding the oriented silicon steel raw material with the thickness of 0.2mm and the width of 590mm into a first sand blasting machine 1, and removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh circular sand and a nozzle air pressure of 0.4Mpa to prepare the non-bottom layer oriented silicon steel raw material.
The effect is as follows: the surface is dark and rough, and the plate type is flat.
Comparative example 3
On the basis of comparative example 2, the processing conditions were further selected as follows:
feeding the oriented silicon steel raw material with the thickness of 0.2mm and the width of 590mm into a first sand blasting machine 1, removing the oriented silicon steel raw material coating and the magnesium silicate glass bottom layer by adopting 150-mesh circular sand and adopting the air pressure of a nozzle of 0.4Mpa to prepare the non-bottom oriented silicon steel raw material, and reducing the sand blasting speed to 50% of that in the comparative example 2.
The effect is as follows: the surface is dark and smooth, and the plate type is slightly deformed.
In the above examples or comparative examples, the blasting rates were kept uniform in all the blasting treatments not specifically described.
Through appearance comparison, the method can obtain excellent surface quality and version under the conditions that the circular sand is selected to be 120-150 meshes and the air pressure of the nozzle is 0.4Mpa, and the version can be seriously deformed when the air pressure of the nozzle is more than or equal to 0.6 Mpa; further, compared with a visual method, the surface quality of the bottomless raw material produced by adopting the specific embodiment of the invention is superior to that of the traditional acid-washed bottom raw material; meanwhile, the comparison shows that the surface quality is not ideal under the condition of processing by using a single sand blasting machine, and the better improvement can not be obtained even if a speed regulation means is adopted, and even the plate type is influenced.
Further, after the preparation of the non-bottom raw material is finished through stress relief annealing, the prepared oriented silicon steel thin strip is obtained through cold rolling the experimental example to 0.08mm, splitting, cleaning, recrystallization annealing and coating according to the subsequent production steps S6-S9; the results of the performance tests are shown in table 1.
TABLE 1 test results of oriented silicon steel strip
| Group of | Loss P1.5/400(W/Kg) | Magnetic induction B800(T) |
| Example 1 | 10.86 | 1.83 |
| Example 2 | 11.98 | 1.79 |
| Example 3 | 12.14 | 1.80 |
| Example 4 | 11.42 | 1.81 |
| Example 5 | 12.67 | 1.80 |
| Example 6 | 11.56 | 1.79 |
| |
11.23 | 1.80 |
| Example 8 | 12.85 | 1.80 |
| Example 9 | 13.74 | 1.79 |
As can be seen from Table 1, the oriented silicon steel strip prepared by the method has excellent magnetic performance.
Although the present invention has been described in detail with reference to examples, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for preparing a non-bottom raw material of an oriented silicon steel thin strip in a physical sand blasting mode is characterized by comprising the following steps:
s1, blank pretreatment;
s2, coating a release agent, and then carrying out high-temperature annealing;
s3, stretching and hot leveling;
s4, performing surface sand blasting treatment to remove the bottom layer;
and S5, stress relief annealing.
2. The method for preparing the bottom-layer-free raw material for the oriented silicon steel strip as claimed in claim 1, wherein the blank pretreatment in the step S1 sequentially comprises pickling normalization, cold rolling, and decarburization annealing.
3. The method for preparing the bottomless raw material for the oriented silicon steel thin strip according to claim 2, wherein the cold rolling process adopts a multi-roll mill to roll the pickled blank to the thickness of 0.2mm-0.35 mm; the cold rolling procedure is single rolling or repeated rolling; wherein the first rolling thickness of the repeated rolling is 0.5mm-0.7 mm.
4. The method of claim 2, wherein the dust generated in the step S4 is recycled and sorted, and the waste is mixed with the waste solution after pickling.
5. The method for manufacturing a raw material for a substrate-free oriented silicon steel strip according to claim 1, wherein the thickness of the strip after the drawing and hot leveling process in S3 is 0.2mm to 0.35 mm.
6. The method for manufacturing a raw material for non-primer layer of thin oriented silicon steel strip according to claim 1 or 5, wherein the surface blasting is performed by using a plurality of sand blasters connected in series in the step S4 by using a plurality of sand blasters.
7. The method for preparing the bottomless raw material for the oriented silicon steel strip as claimed in claim 6, wherein in the step S4, the surface sand blasting is performed by using two-stage sand blasting, and two sand blasting machines are connected in series; the two sand blasting machines are respectively a first sand blasting machine and a second sand blasting machine; the steel belt passes through the first sand blasting machine and the second sand blasting machine in sequence; the first sand blasting machine carries out surface rough machining, and the second sand blasting machine carries out surface finish machining.
8. The method for preparing the bottomless raw material for the oriented silicon steel strip as claimed in claim 7, wherein the grinding material of the sand blasting machine is round sand or rhombic sand; the size of the abrasive is 100-300 meshes.
9. The method for preparing the bottomless raw material for the oriented silicon steel thin strip according to claim 8, wherein the sand blasting machine adopts a suction type sand blasting mechanism and comprises an air source system; the air compressor flow of the air source system is 10-40 cubic per minute, and the pressure is 0.2-0.8 Mpa.
10. The method for producing a bottomless raw material for the oriented silicon steel strip as claimed in claim 9, wherein the blasting machine is an oscillating blasting machine having a plurality of nozzles respectively provided above and below the steel strip; the pressure of the nozzle is 0.2MPa-0.6 MPa; the steel belt conveying speed is 0.5m/min-5 m/min.
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