CN109166721B - Method for changing performance of ferrite magnetic sheet - Google Patents
Method for changing performance of ferrite magnetic sheet Download PDFInfo
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- CN109166721B CN109166721B CN201811038862.8A CN201811038862A CN109166721B CN 109166721 B CN109166721 B CN 109166721B CN 201811038862 A CN201811038862 A CN 201811038862A CN 109166721 B CN109166721 B CN 109166721B
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 13
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 13
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 claims description 10
- 238000007619 statistical method Methods 0.000 claims description 9
- KOMIMHZRQFFCOR-UHFFFAOYSA-N [Ni].[Cu].[Zn] Chemical compound [Ni].[Cu].[Zn] KOMIMHZRQFFCOR-UHFFFAOYSA-N 0.000 claims description 8
- 238000003475 lamination Methods 0.000 claims description 7
- -1 polyethylene terephthalate Polymers 0.000 claims description 7
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 claims description 6
- 229910001308 Zinc ferrite Inorganic materials 0.000 claims description 6
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 5
- 239000000654 additive Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 238000009776 industrial production Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 206010041662 Splinter Diseases 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention provides a method for changing the performance of a ferrite magnetic sheet, which comprises the following steps: 1) setting the step range of the change of the inductance value, and selecting samples from ferrite magnetic sheets with the same thickness and the same composition; 2) film pasting is carried out on the selected sample to obtain a film pasting sample; 3) selecting the diameter and the length of a steel rod, grouping the film pasting samples in each inductance value step length range, rolling and cracking the film pasting samples by the corresponding steel rod in each group, and testing the inductance value of the cracked samples; 4) establishing a corresponding relation among the inductance value step range, the diameter and the length of the steel rod, the pressure and the inductance value of the sample measured after the splintering; 5) and according to the inductance value of the ferrite magnetic sheet to be processed, the required inductance value and the corresponding relation, acquiring corresponding rolling conditions and performing rolling splitting on the ferrite magnetic sheet to be processed to obtain the ferrite magnetic sheet with the inductance value meeting the requirement. The method solves the problem that the product performance of the ferrite magnetic sheet produced industrially is difficult to have consistency.
Description
Technical Field
The invention belongs to the technical field of magnetic materials, relates to the performance of ferrite magnetic sheets, and particularly relates to a method for changing the performance of ferrite magnetic sheets.
Background
The electromagnetic induction wireless charging utilizes the electromagnetic induction principle of electricity generation and magnetism generation, namely, the mutual conversion between electricity and magnetism can be realized. The mobile phone and the wireless charger are respectively provided with a receiving/transmitting coil at two ends, the current of the wireless charger generates a magnetic field through the coil at the transmitting end, the coil at the receiving end of the mobile phone generates current when approaching the magnetic field, and then the current is converted into usable DC direct current through a built-in rectification voltage-stabilizing filter circuit of the mobile phone.
in a wireless charging device, a nickel-copper-zinc soft magnetic ferrite sheet is required to be used, and because the nickel-copper-zinc soft magnetic ferrite sheet is used in a mobile phone, the used magnetic sheet is limited to be very thin, generally 20-300um, the magnetic sheet is prepared by using pre-sintered magnetic powder, adding a certain amount of binder, plasticizer and dispersant to synthesize slurry, casting the slurry into a raw belt, cutting the raw belt, and then sintering the raw belt at high temperature.
however, in the batch production process, due to the components of the magnetic powder, the particle size difference in the production process and the batch-to-batch difference, the properties of the sintered product are different. The performance of the soft magnetic ferrite sheet for wireless charging is subjected to inductance value measurement and magnetic permeability measurement after sintering, even if the performance of products in the same batch in the same kiln is different after sintering, the industrial production process requires that products with consistent quality are provided for customers, and great troubles are caused to production.
In the prior art, most methods for changing the performance are started from the formulation components, and the problem of product performance consistency in the industrial production process cannot be solved.
CN106709186A discloses a permanent magnetic ferrite magnetic performance aided design system, which comprises a formula process generation module, a target performance input module, a pre-sintering material magnetic performance information input module, an additive limiting module and a formula process output module; the target performance input module, the pre-sintering material magnetic performance information input module, the additive limiting module and the formula process output module are respectively connected with the formula process generating module; the target performance input module is used for inputting the magnetic performance information of the target permanent magnetic ferrite; the pre-sintered material magnetic property information input module is used for inputting the magnetic property information of the permanent magnetic ferrite pre-sintered material; the additive limiting module is used for limiting additives needing to be added in the target permanent magnetic ferrite; the formula process generation module is used for generating the optimal proportion of the additives required by reaching the target performance; and the formula process output module is used for outputting the optimal proportion of the additives required by reaching the target performance. The system of the invention can shorten the product research and development period and reduce the research and development cost.
Although the performance of the ferrite can be changed, the production cost is seriously increased, and the problem of consistent product performance cannot be solved.
Therefore, the development of a method capable of solving the problem of product performance consistency in the industrial production of ferrite magnetic sheets is of great significance to the industrial production in the field.
disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for changing the performance of a ferrite magnetic sheet.
In order to achieve the purpose, the invention adopts the following technical scheme:
The invention provides a method for changing the performance of a ferrite magnetic sheet, which comprises the following steps:
(1) Setting the step range of the change of the inductance value, and selecting a sample falling into the corresponding inductance value range from ferrite magnetic sheets with the same thickness and the same composition;
(2) Pasting a film on the sample selected in the step (1) to obtain a film pasting sample;
(3) Selecting the diameter and the length of a steel rod, grouping the film-pasted samples in each inductance value step length range according to the selected steel rod, performing rolling and splitting on each group by using the corresponding steel rod under a selected pressure, and testing the inductance value of the split samples;
(4) Carrying out statistical analysis on the inductance step range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splitting, and establishing a corresponding relation;
(5) and (3) according to the inductance value of the ferrite magnetic sheet to be processed, the inductance value required after film lamination and splitting and the corresponding relation obtained in the step (4), obtaining the length and the diameter of a corresponding steel rod and corresponding pressure, and performing roll-in and splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement, wherein the thickness and the composition of the ferrite magnetic sheet to be processed are the same as those of the ferrite magnetic sheet in the step (1).
in industrial production, the sintered magnetic sheet is a complete hard magnetic sheet, and the magnetic sheet after being coated with the film is a soft sheet after being coated because of cracking, and a large number of tests show that the magnetic permeability and the inductance value can be dropped due to cracking, and the inductance value of the magnetic sheet can be slightly influenced by the coating. The method provided by the invention utilizes the phenomenon that the split sheet can change the performance of the magnetic sheet after the film is pasted to controllably change the performance of each magnetic sheet through data test, collection and analysis, finally can ensure that the quality of the product has consistency, and solves the problem that the product performance of the ferrite magnetic sheet produced industrially is difficult to have consistency.
The corresponding relation between the step (4) and the step (5) of the invention refers to the corresponding relation between the inductance value range of the ferrite magnetic sheet with the same thickness and the same composition before the lamination and the splitting and the inductance value range after the lamination and the rolling and the splitting of a steel rod with a certain length and a certain diameter under a certain pressure. For example, a 128KHz Ni-Zn ferrite magnetic sheet, which has a thickness of 120 μm, an inductance value ranging from 11.2 to 11.25 before film lamination and splitting, and an inductance value ranging from 11.15 to 11.21 after roll-splitting using a 30cm long steel rod with a diameter of 30mm under a pressure of 0.3 MPa.
The ferrite magnetic sheet is prepared by preferably using pre-sintered magnetic powder, adding a certain amount of binder, plasticizer and dispersant to synthesize slurry, casting the slurry into a raw belt, cutting and sintering at high temperature.
in the present invention, the same composition as in step (1) means that the components of the ferrite magnetic sheet and the proportions thereof are the same. In the step (5), the composition of the ferrite magnetic sheet to be treated is the same as that of the ferrite magnetic sheet in the step (1), namely the components and the proportions of the components of the ferrite magnetic sheet to be treated are the same as those of the ferrite magnetic sheet in the step (1).
The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the technical objects and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.
As a preferable embodiment of the present invention, in the step (1), the inductance value is varied in a step range of < 0.1, for example, 0.099, 0.09, 0.08, 0.07, 0.06, 0.05, 0.04, or the like. If the step range of the inductance value change is too large, the corresponding relation error obtained subsequently is too large, and the industrial application value is lost.
As a preferable mode of the present invention, in the step (1), the thickness of the ferrite magnetic sheet is 20 μm to 300 μm, for example, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 125 μm, 150 μm, 175 μm, 200 μm, 225 μm, 250 μm, 275 μm or 300 μm, but the thickness is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable.
Preferably, in the step (1), the ferrite magnetic sheet includes any one of a nickel zinc ferrite magnetic sheet, a manganese zinc ferrite magnetic sheet, or a nickel copper zinc ferrite magnetic sheet.
as a preferred technical solution of the present invention, in the step (1), the number of samples selected in each inductance value step range is greater than or equal to 100, for example, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, or 200 samples, and if the number of samples is too small, the corresponding relationship error obtained subsequently is too large, and the industrial application value is lost.
Preferably, the number of samples selected in each inductance value step range is the same.
in a preferred embodiment of the present invention, in the step (2), the film used for the adhesive film is a polyethylene terephthalate (PET) film.
In a preferred embodiment of the present invention, in step (3), the diameter of the steel rod is 30 to 50mm, for example, 30mm, 35mm, 40mm, 45mm or 50mm, but the steel rod is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, in step (3), the diameter of the steel rod is 30mm, 40mm or 50 mm.
Preferably, in step (3), the length of the steel rod is 20-40cm, such as 20cm, 22cm, 24cm, 26cm, 28cm, 30cm, 32cm, 34cm, 36cm, 38cm or 40cm, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
In a preferred embodiment of the present invention, in the step (3), the pressure is 0.1 to 0.5MPa, for example, 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa or 0.5MPa, but the pressure is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
As a preferred technical solution of the present invention, in the step (3), the method of grouping the film samples for each inductance value step range corresponds to one group for each selected steel rod, and further comprises a control group. The control group can be used for acquiring the change of the inductance value of the ferrite magnetic sheet caused by the film sticking.
As a preferred technical scheme of the invention, in the step (3), an electric sensing tester is used for testing the inductance value of the sample after the splinter.
preferably, in step (3), the inductance value of the sample after the test is set at a frequency of 10KHz to 13.56MHz, such as 10KHz, 50KHz, 100KHz, 128KHz, 150KHz, 300KHz, 400KHz, 500KHz, 1MHz, 1.2MHz, 1.4MHz, 1.5MHz, 2MHz, 3MHz, 4MHz, 5MHz, 6MHz, 7MHz, 8MHz, 9MHz, 10MHz, 11MHz, 12MHz, 13MHz or 13.56MHz, but not limited to the enumerated values, and other non-enumerated values in the range of values are equally applicable.
Preferably, in the step (3), the set frequency of the inductance value of the sample after the test of the splinter is 128KHz, 6.78MHz or 13.56 MHz.
As a further preferred technical solution of the method of the present invention, the method comprises the steps of:
(1) Setting a step range of inductance value change, wherein the step range of inductance value change is less than 0.1, selecting samples falling into a corresponding inductance value range from ferrite magnetic sheets with the same thickness and composition, the number of the selected samples in each inductance value step range is more than or equal to 100, the number of the samples is the same, and the thickness of each ferrite magnetic sheet is 20-300 μm;
Wherein the ferrite magnetic sheet comprises any one of a nickel zinc ferrite magnetic sheet, a manganese zinc ferrite magnetic sheet or a nickel copper zinc ferrite magnetic sheet;
(2) Attaching a polyethylene glycol terephthalate film to the sample selected in the step (1) to obtain a film attaching sample;
(3) Selecting the diameter and the length of a steel rod, wherein the diameter of the steel rod is 30mm, 40mm or 50mm, the length of the steel rod is 20-40cm, grouping the film pasting samples in each inductance value step range according to the selected steel rod, the number of the grouping is 1 more than the number of the selected steel rods, each selected steel rod corresponds to one group, the steel rod selecting method also comprises a comparison group, performing roll fracturing on the film pasting samples of the corresponding group under the same pressure, and testing the inductance value of the cracked samples by using an electric sensing tester at the set frequency of 128KHz, 6.78MHz or 13.56 MHz;
wherein the pressure is 0.1-0.5 MPa;
(4) Carrying out statistical analysis on the inductance step range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splitting, and establishing a corresponding relation;
(5) And (3) according to the inductance value of the ferrite magnetic sheet to be processed, the inductance value required after film lamination and splitting and the corresponding relation obtained in the step (4), obtaining the length and the diameter of a corresponding steel rod and corresponding pressure, and performing roll-in and splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement, wherein the thickness and the composition of the ferrite magnetic sheet to be processed are the same as those of the ferrite magnetic sheet in the step (1).
Compared with the prior art, the invention has the following beneficial effects:
the method for changing the performance of the ferrite magnetic sheet provided by the invention establishes the corresponding relation among the diameter, the length and the pressure of a steel rod for rolling the split sheet and the inductance values of the ferrite magnetic sheet before and after the split sheet by using the phenomenon that the split sheet can change the performance of the magnetic sheet after film sticking through data testing, collecting and analyzing, and controllably changes the performance of each magnetic sheet, so that the quality of products can be consistent finally, and the problem that the performance of the ferrite magnetic sheet produced industrially is difficult to have consistency is solved.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
the following are typical but non-limiting examples of the invention:
example 1
This example changed the properties of the ferrite magnetic sheet as follows:
(1) For a nickel-zinc ferrite magnetic sheet with the thickness of 120 mu m and the frequency of 128KHz, 160 samples with inductance values of 11.2-11.25, 11.3-11.35, 11.4-11.45 and 11.5-11.55 are taken, and the step range of the inductance value change is 0.05.
(2) And (2) attaching a polyethylene terephthalate (PET) film to the sample selected in the step (1) to obtain a film attaching sample.
(3) Selecting a steel rod with the length of 30cm and the diameters of 30mm, 40mm and 50mm, dividing the samples in the step length range of each inductance value change in the step (1) into 4 groups with 40 pieces in each group, performing roll cracking on the film pasting samples of the corresponding group by using the selected steel rod under the pressure of 0.3MPa, leaving a group of non-cracking samples for comparison, and testing the inductance values of the cracked samples by using an inductance tester at the set frequency of 128 KHz.
(4) And (3) carrying out statistical analysis on the step size range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splintering to establish a corresponding relation, wherein the corresponding relation is shown in a table 1.
(5) And (3) acquiring the length and the diameter of a corresponding steel rod and corresponding pressure according to the inductance value of the nickel-zinc ferrite magnetic sheet (the components and the component proportion of the magnetic sheet are the same as those in the step (1)) with the thickness of 120 mu m and the frequency of 128KHz to be processed, the inductance value required after film sticking and splitting and the corresponding relation obtained in the step (4), and performing roll splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement.
TABLE 1
example 2
this example changed the properties of the ferrite magnetic sheet as follows:
(1) For a nickel-zinc ferrite magnetic sheet with the thickness of 20 mu m and the frequency of 6.78MHz, 160 samples with inductance values of 11.2-11.25, 11.3-11.35, 11.4-11.45 and 11.5-11.55 are taken, and the step range of the change of the inductance value is 0.05.
(2) and (2) attaching a polyethylene terephthalate (PET) film to the sample selected in the step (1) to obtain a film attaching sample.
(3) Selecting a steel rod with the length of 20cm and the diameters of 30mm, 40mm and 50mm, dividing each sample in the step length range of inductance value change in the step (1) into 4 groups with 40 pieces in each group, performing roll fracturing on the film pasting samples of the corresponding group by using the selected steel rod under the pressure of 0.1MPa, leaving a group of non-fractured samples for comparison, and testing the inductance value of the cracked samples by using an inductance tester at the set frequency of 6.78 MHz.
(4) And (3) carrying out statistical analysis on the step size range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splintering to establish a corresponding relation, wherein the corresponding relation is shown in a table 2.
(5) And (3) obtaining the length and the diameter of a corresponding steel rod and corresponding pressure according to the inductance value of the nickel-zinc ferrite magnetic sheet (the components and the component proportion of the magnetic sheet are the same as those in the step (1)) with the thickness of 20 mu m and the frequency of 6.78MHz to be processed, the inductance value required after film pasting and splitting and the corresponding relation obtained in the step (4), and performing roll splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement.
TABLE 2
Example 3
This example changed the properties of the ferrite magnetic sheet as follows:
(1) for a nickel-zinc ferrite magnetic sheet with the thickness of 300 mu m and the frequency of 13.56MHz, 160 samples with inductance values of 11.2-11.25, 11.3-11.35, 11.4-11.45 and 11.5-11.55 are taken, and the step range of the change of the inductance value is 0.05.
(2) And (2) attaching a polyethylene terephthalate (PET) film to the sample selected in the step (1) to obtain a film attaching sample.
(3) Selecting a steel rod with the length of 40cm and the diameters of 30mm, 40mm and 50mm, dividing each sample in the step length range of inductance value change in the step (1) into 4 groups with 40 pieces in each group, performing roll fracturing on the film pasting samples of the corresponding group by using the selected steel rod under the pressure of 0.5MPa, leaving a group of non-fractured samples for comparison, and testing the inductance value of the cracked samples by using an inductance tester at the set frequency of 13.56 MHz.
(4) And (3) carrying out statistical analysis on the step size range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splintering to establish a corresponding relation, wherein the corresponding relation is shown in a table 3.
(5) and (3) obtaining the length and the diameter of a corresponding steel rod and corresponding pressure according to the inductance value of the nickel-zinc ferrite magnetic sheet (the components and the component proportion of the magnetic sheet are the same as those in the step (1)) with the thickness of 300 mu m and the frequency of 13.56MHz to be processed, the inductance value required after film pasting and splitting and the corresponding relation obtained in the step (4), and performing roll splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement.
TABLE 3
Example 4
This example changed the properties of the ferrite magnetic sheet as follows:
(1) For a manganese zinc ferrite magnetic sheet with the thickness of 120 mu m and the frequency of 128KHz, 200 samples with inductance values of 11.2-11.299, 11.3-11.399, 11.4-11.499 and 11.5-11.599 are taken, and the step range of the inductance value change is 0.099.
(2) And (2) attaching a polyethylene terephthalate (PET) film to the sample selected in the step (1) to obtain a film attaching sample.
(3) selecting steel rods with the lengths of 20cm and 40cm and the diameters of 30mm and 50mm, namely selecting 4 sizes of steel rods, which respectively comprise: 20cm long by 30mm diameter, 40cm long by 50mm diameter and 20cm long by 50mm diameter. Dividing the samples in the step length range of each inductance value change in the step (1) into 5 groups, dividing each group into 40 pieces, performing roll pressing and splitting on the film pasting samples of the corresponding group by using a selected steel rod under the pressure of 0.3MPa, leaving a group of non-split samples for comparison, and testing the inductance value of the split samples by using an inductance tester at the set frequency of 128 KHz.
(4) and (3) carrying out statistical analysis on the step size range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splintering to establish a corresponding relation, wherein the corresponding relation is shown in a table 4.
(5) And (3) acquiring the length and the diameter of a corresponding steel rod and corresponding pressure according to the inductance value of the manganese-zinc-ferrite magnetic sheet (the component and the component proportion of the magnetic sheet are the same as those in the step (1)) with the thickness of 120 mu m and the frequency of 128KHz to be processed, the inductance value required after film sticking and sheet splitting and the corresponding relation obtained in the step (4), and performing roll pressing and sheet splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement.
TABLE 4
Example 5
This example changed the properties of the ferrite magnetic sheet as follows:
(1) for a nickel-copper-zinc ferrite magnetic sheet with the thickness of 120 mu m and the frequency of 128KHz, 120 samples with inductance values of 11.2-11.25, 11.3-11.35, 11.4-11.45 and 11.5-11.55 are taken, and the step range of the inductance value change is 0.05.
(2) And (2) attaching a polyethylene terephthalate (PET) film to the sample selected in the step (1) to obtain a film attaching sample.
(3) Selecting a steel rod with the length of 30cm and the diameter of 40mm, selecting the pressure of 0.2MPa and 0.4MPa, dividing the samples in the step length range of each inductance value change in the step (1) into 3 groups, wherein each group comprises 40 pieces, performing roll splitting on the film pasting samples of the corresponding group by using the steel rod with the length of 30cm and the diameter of 40mm under corresponding pressure, leaving a group of non-split samples for comparison, and testing the inductance value of the split samples by using an inductance tester at the set frequency of 128 KHz.
(4) And (3) carrying out statistical analysis on the step size range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splintering to establish a corresponding relation, wherein the corresponding relation is shown in a table 5.
(5) And (3) obtaining the length and the diameter of a corresponding steel rod and corresponding pressure according to the inductance value of the nickel-copper-zinc ferrite magnetic sheet (the components and the component proportion of the magnetic sheet are the same as those in the step (1)) with the thickness of 120 mu m and the frequency of 128KHz to be processed, the inductance value required after film pasting and splitting and the corresponding relation obtained in the step (4), and performing roll splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement.
TABLE 5
By combining the embodiments, the method for changing the performance of the ferrite magnetic sheet provided by the invention utilizes the phenomenon that the split sheet can change the performance of the magnetic sheet after film sticking through data test, collection and analysis, establishes the corresponding relation between the diameter and the length of the steel rod for rolling the split sheet, the pressure and the inductance values of the ferrite magnetic sheet before and after the split sheet, can controllably change the performance of each magnetic sheet, and finally can ensure that the quality of products has consistency.
the applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (16)
1. a method of modifying the properties of a ferrite magnetic sheet, the method comprising the steps of:
(1) Setting the step range of the change of the inductance value, and selecting a sample falling into the corresponding inductance value range from ferrite magnetic sheets with the same thickness and the same composition;
(2) Pasting a film on the sample selected in the step (1) to obtain a film pasting sample;
(3) Selecting the diameter and the length of a steel rod, grouping the film-pasted samples in each inductance value step length range according to the selected steel rod, performing rolling and splitting on each group by using the corresponding steel rod under a selected pressure, and testing the inductance value of the split samples;
(4) Carrying out statistical analysis on the inductance step range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splitting, and establishing a corresponding relation;
(5) and (3) according to the inductance value of the ferrite magnetic sheet to be processed, the inductance value required after film lamination and splitting and the corresponding relation obtained in the step (4), obtaining the length and the diameter of a corresponding steel rod and corresponding pressure, and performing roll-in and splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement, wherein the thickness and the composition of the ferrite magnetic sheet to be processed are the same as those of the ferrite magnetic sheet in the step (1).
2. The method of claim 1, wherein in step (1), the inductance value varies by a step range of < 0.1.
3. the method according to claim 1, wherein in the step (1), the thickness of the ferrite magnetic sheet is 20 μm to 300 μm.
4. The method according to claim 1, wherein in step (1), the ferrite magnetic sheet comprises any one of a nickel zinc ferrite magnetic sheet, a manganese zinc ferrite magnetic sheet, or a nickel copper zinc ferrite magnetic sheet.
5. the method of claim 1, wherein in step (1), the number of samples selected in each inductance value step size range is greater than or equal to 100.
6. the method of claim 5, wherein the number of samples selected in each inductance value step size range is the same.
7. The method according to claim 1, wherein in the step (2), the film used for the film pasting is a polyethylene terephthalate film.
8. The method according to claim 1, wherein in step (3), the diameter of the steel rod is 30-50 mm.
9. The method of claim 8, wherein in step (3), the steel rod has a diameter of 30mm, 40mm or 50 mm.
10. The method according to claim 1, wherein in step (3), the length of the steel rod is 20-40 cm.
11. The method according to claim 1, wherein in the step (3), the pressure is 0.1 to 0.5 MPa.
12. The method of claim 1, wherein in step (3), the step of grouping the film samples for each inductance value step size range comprises grouping each selected steel rod in a group, and further comprising a control group.
13. The method of claim 1, wherein in step (3), the inductance value of the cracked sample is tested with an electrical sensing tester.
14. the method of claim 1, wherein in step (3), the inductance value of the sample after the test is set at a frequency of 10KHz to 13.56 MHz.
15. The method of claim 14, wherein in step (3), the inductance value of the sample after the test is set at 128KHz, 6.78MHz or 13.56 MHz.
16. Method according to claim 1, characterized in that it comprises the following steps:
(1) Setting a step range of inductance value change, wherein the step range of inductance value change is less than 0.1, selecting samples falling into a corresponding inductance value range from ferrite magnetic sheets with the same thickness and composition, the number of the selected samples in each inductance value step range is more than or equal to 100, the number of the samples is the same, and the thickness of each ferrite magnetic sheet is 20-300 μm;
Wherein the ferrite magnetic sheet comprises any one of a nickel zinc ferrite magnetic sheet, a manganese zinc ferrite magnetic sheet or a nickel copper zinc ferrite magnetic sheet;
(2) Attaching a polyethylene glycol terephthalate film to the sample selected in the step (1) to obtain a film attaching sample;
(3) Selecting the diameter and the length of a steel rod, wherein the diameter of the steel rod is 30mm, 40mm or 50mm, the length of the steel rod is 20-40cm, grouping the film pasting samples in each inductance value step range according to the selected steel rod, the number of the grouping is 1 more than the number of the selected steel rods, each selected steel rod corresponds to one group, the steel rod selecting method also comprises a comparison group, performing roll fracturing on the film pasting samples of the corresponding group under the same pressure, and testing the inductance value of the cracked samples by using an electric sensing tester at the set frequency of 128KHz, 6.78MHz or 13.56 MHz;
wherein the pressure is 0.1-0.5 MPa;
(4) carrying out statistical analysis on the inductance step range of the inductance value set in the step (1), the diameter and the length of the steel rod selected in the step (3), the pressure and the measured inductance value of the sample after splitting, and establishing a corresponding relation;
(5) And (3) according to the inductance value of the ferrite magnetic sheet to be processed, the inductance value required after film lamination and splitting and the corresponding relation obtained in the step (4), obtaining the length and the diameter of a corresponding steel rod and corresponding pressure, and performing roll-in and splitting on the ferrite magnetic sheet to be processed by using the steel rod under the corresponding pressure to obtain the ferrite magnetic sheet with the inductance value meeting the requirement, wherein the thickness and the composition of the ferrite magnetic sheet to be processed are the same as those of the ferrite magnetic sheet in the step (1).
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Application publication date: 20190108 Assignee: Jinhua cimeng Intellectual Property Service Co.,Ltd. Assignor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Contract record no.: X2023330000883 Denomination of invention: A method to change the performance of ferrite magnetic sheets Granted publication date: 20191217 License type: Common License Record date: 20231128 |