CN102592771A - Novel antitheft tag magnetic material, production process thereof and acoustic magnetic antitheft tag - Google Patents
Novel antitheft tag magnetic material, production process thereof and acoustic magnetic antitheft tag Download PDFInfo
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- CN102592771A CN102592771A CN2012100509510A CN201210050951A CN102592771A CN 102592771 A CN102592771 A CN 102592771A CN 2012100509510 A CN2012100509510 A CN 2012100509510A CN 201210050951 A CN201210050951 A CN 201210050951A CN 102592771 A CN102592771 A CN 102592771A
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Abstract
The invention relates to a novel antitheft tag magnetic material and a production process of the novel antitheft tag magnetic material, wherein the producing process comprises the steps of: adopting a cold-rolled steel plate and hot-rolling the cold-rolled steel plate to the thickness of 1+/-0.2 mm; coating heat treatment protective paint which is 0.5+/-0.05 mm in thickness and contains 1% of Nb on the surface of the hot-rolled steel plate; carrying out heat treatment on the hot-rolled steel plate which is coated with the heat treatment protective paint at the temperature of 850-900 DEG C; carrying out heat treatment at the temperature of 700-750 DEG C; and cooling. The invention also relates to an acoustic magnetic antitheft tag; a magnetic biasing piece is made from the novel antitheft tag magnetic material; and a resonant sheet is made from a microcrystal soft magnetic material. In the invention, stainless steel materials which are low in cost and can be produced in batch by stainless steel manufacture factories are taken as raw materials, so that the defect that the existing semi-hard magnetic materials are less in manufacture factory, long in ordering cycle and high in cost is solved; and as the novel antitheft tag magnetic material is a magnetic material with high coercive force and low residual magnetism, the structural design of the acoustic magnetic antitheft tag is simplified, and the manufacturing cost is greatly reduced.
Description
Technical field
The present invention relates to commercial anti-theft tag technical field, relate in particular to a kind of novel anti-theft label magnetic material and production technology and acoustic magnetic anti-theft label.
Background technology
The sound magnetic technology has been widely used in electronic item supervision anti-theft device and had reached for two more than ten years; The U.S. Pat 4510489 of putting down in writing original invention discloses some amorphous alloy material strip because of having very high magnetic-elasticity coupling coefficient; So can send the strong resonance signal; And utilize this principle that these materials successfully are applied to commercial burglary-resisting system (sound magnetic system), like the burglary-resisting system of large supermarket.The sound magnetic system mainly comprises detector, decoder and verifier, anti-theft audio magnetic target etc., and commercial widely used detector is the Ultramax detector of being made by U.S. Sensormatic electronics corporation (Sensormatic Electronics Corporation) now.This detector can be launched the 58kHz impulse wave, is used to excite the anti-theft audio magnetic target of the not decoding (activated state) in search coverage, makes it produce very strong signal in 58kHz resonance and is accepted by search coil, after signal amplifies analysis, triggers and reports to the police.Decoding is exactly to shift out with the demagnetization of the bias slice in the anti-theft audio magnetic target and with resonance frequency to survey the frequency range window, and the while has significantly reduced resonance signal intensity and do not triggered alarm.The anti-theft audio magnetic target can be divided into two kinds: hard target of anti-theft audio magnetic and anti-theft audio magnetic label (hereinafter to be referred as audio magnetic label).The former uses amorphous ribbon as resonance plate, adopts permanent magnetic material (for example permanent-magnet ferrite) as bias slice.This type of antitheft target can not be decoded, and can only reuse in shop the inside, has paid the hard target of anti-theft audio magnetic on the commodity of money and has let commodity leave the shop through the method for opening the mechanical needle locking device and taking off the hard target of anti-theft audio magnetic and do not trigger the doorway alarm; The latter also adopts amorphous ribbon as resonance plate, all adopts " semihard magnetic " material as bias slice always, and this type audio magnetic label can decode and activate repeatedly.The method of audio magnetic label through demagnetization decoding on decoder on the commodity of money of having paid lets commodity leave the shop and do not trigger the doorway alarm.Bias slice is the critical component in the audio magnetic label, and the resonance frequency of decision audio magnetic label makes detection system can clearly offer an explanation out the activated state and the non-activated state (decoded attitude) of audio magnetic label, and greatly affects the performance and the price of anti-theft tag.
Existing audio magnetic label all adopts half-hard magnetic material to make bias slice; Because half-hard magnetic material complex manufacturing, at present domestic most of half-hard magnetic materials need to cost an arm and a leg from external import; Order cycle time is long, and it is high to cause making the bias slice cost with half-hard magnetic material.
Because the half-hard magnetic material coercive force is high, remanent magnetism is high, and the bias slice of half-hard magnetic material can produce stronger " clamping " to resonance plate inevitably thereby effect reduces the resonance amplitude of resonance plate.Therefore the audio magnetic label in past has to adopt the remedial technique measure of some to reduce this damping action to the resonance amplitude; As bias slice being designed to the complicated parallelogram of chamfering; Resonance plate is made crooked arc of broad ways, and the thickness that semihard magnetic bias sheet is placed on the resonating cativty outside and increases audio magnetic label is with distance of increasing resonance plate and bias slice or the like.Especially semihard magnetic bias sheet must accurately be located very thin sheet material for the multiple involution in back at the cavity external fixation, makes manufacturing process complicated.This not only increases the sheet material difficulty of processing, and uneven resonance plate receives slight pressure easily and changes resonance frequency.
Summary of the invention
The technical problem that the present invention will solve is: in order to overcome deficiency of the prior art, the present invention provides a kind of novel anti-theft label magnetic material and production technology and acoustic magnetic anti-theft label.
The technical solution adopted for the present invention to solve the technical problems is: a kind of novel anti-theft label magnetic material, and the chemical composition percentage by weight is: C is≤0.03%, Si is≤0.03%; Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%; Cr is 18.0%～20.0%; Ni is 3.0%～5.0%, and Mo is 3.5%～4.5%, and all the other are Fe; Thickness is 0.05mm～0.2mm.
Has following performance: coercivity H >=100Oe, remanent magnetization Br:0.8T～1.2T, hardness >=600HV.
A kind of production technology of novel anti-theft label magnetic material adopts cold-rolled steel sheet, coercivity H: 10Oe～20Oe, remanent magnetization Br>=70T; The chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%, and Cr is 18.0%～20.0%, and Ni is 19%～22%, and Mo is 3.5%～4.5%, and all the other are Fe, may further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃～900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃～750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Described cold-rolled steel sheet thickness is 2.5mm～3.5mm.
A kind of acoustic magnetic anti-theft label; Comprise long and narrow box body, described box body has cavity, is provided with a slice magnetic bias sheet and a slice resonance plate at least in the cavity; Box body is provided with lid; Said magnetic bias sheet and resonance plate are layered arrangement, and described magnetic bias sheet is a novel anti-theft label magnetic material, and described resonance plate is a minicrystal soft magnetic material.
Described magnetic bias sheet is formed by the cutting of novel anti-theft label magnetic material.
Novel anti-theft label magnetic material of the present invention is mainly used in various anti-theft tags, and its purposes is comparatively extensive, is very promising a kind of magnetic material.Have high-ductility, high tenacity, high-coercive force, high strength, the easy characteristic of shearing, and this magnetic material is not easy demagnetization and aging, rustless property is better.From chemical composition, it is similar to stainless steel material, the real ferrous alloy that belongs to; Because the size of this material finished product is thinner; Need the grain size in the control steel, add 1% niobium element, for follow-up cold and hot working plays crystal grain thinning, prevents intercrystalline corrosion.In like manner, it may occur to persons skilled in the art that to add titanium, copper, can play crystal grain thinning equally, prevent the effect of intercrystalline corrosion.
Measured result shows that coercive force is high, and the audio magnetic label that the magnetic material that remanent magnetism is low is made bias slice still can normally be detected by commercial obtainable Ultramax device.Therefore, the requirement of high remanent magnetism is unnecessary, cause on the contrary bigger to resonance plate " clamping " effect and produce excessive damping action to resonance.
On the domestic market, the use of stainless steel material is very general, and use amount is big, can produce in batches, and price is lower, the good selection that the bias slice that adopts stainless steel material manufacturing anti-theft audio magnetic label to use reduces cost beyond doubt.But; Existing technology can only be processed into coercive force height, magnetic material that remanent magnetism is high with stainless steel material; Resonance plate is produced stronger " clamping " thereby the resonance amplitude of effect reduction resonance plate for fear of bias slice, the manufacturing process of audio magnetic label must be complicated, increased production cost.
The invention has the beneficial effects as follows; The present invention adopts stainless steel material as raw material; Cost is low and can be produced in batches by Stainless Steel Production producer; The manufacturer of audio magnetic label only need order and can produce, and the manufacturer that has solved existing half-hard magnetic material is few, the order cycle time long, expensive deficiency; Because novel anti-theft label magnetic material of the present invention is the magnetic material of high-coercive force, low remanent magnetism; Can not produce " clamping " effect during as bias slice to resonance plate and influence the strength of resonance; Thereby the structural design of audio magnetic label is oversimplified, greatly reduce manufacturing cost.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the structural representation of the optimum embodiment of acoustic magnetic anti-theft label among the present invention.
Among the figure 1, the magnetic bias sheet, 2, resonance plate, 3, box body, 4, lid, 5, cavity.
Embodiment
Combine accompanying drawing that the present invention is done further detailed explanation now.These accompanying drawings are the sketch map of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
A kind of novel anti-theft label magnetic material, the chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%; P is≤0.06%, and S is≤0.03%, and Cr is 18.0%～20.0%; Ni is 3.0%～5.0%, and Mo is 3.5%～4.5%, and all the other are Fe; Thickness is 0.05mm～0.2mm.
Has following performance: coercivity H >=100Oe, remanent magnetization Br:0.8T～1.2T, hardness >=600HV.
A kind of acoustic magnetic anti-theft label; Comprise long and narrow box body 3, described box body 3 has cavity 5, is provided with a slice magnetic bias sheet 1 and a slice resonance plate 2 at least in the cavity 5; Box body 3 is provided with lid 4; Said magnetic bias sheet 1 is layered arrangement with resonance plate 2, and described magnetic bias sheet 1 is claim 1 or 2 described novel anti-theft label magnetic materials, and described resonance plate 2 is a minicrystal soft magnetic material.
Described magnetic bias sheet is formed by the cutting of novel anti-theft label magnetic material.
A kind of production technology of novel anti-theft label magnetic material adopts cold-rolled steel sheet, coercivity H: 10Oe～20Oe, remanent magnetization Br>=70T; The chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%, and Cr is 18.0%～20.0%, and Ni is 19%～22%, and Mo is 3.5%～4.5%, and all the other are Fe; Thickness is 2.5mm～3.5mm.
Embodiment 1
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb; Contain niobium when high, magnetic property reduces; Contain niobium when low, material final molding difficulty.If adopt vacuum three beams processing method, batch productions such as electrochemical method, cost is high, is not easy to produce in batches.As in the alloy melting process, adding niobium,, and magnetic property is not had any effect owing to the crystal grain thinning effect.
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃～900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃～750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Wherein, the content of strict control C, Si, Mn, P, S impurity, otherwise magnetic property is low excessively.Cr gains in strength, anticorrosive.Ni enlarges Alpha's phase, the stabilized magnetic ability, and the words magnetic property decay that content is low is fast.Mo improves coercive force.
Prepared novel anti-theft label magnetic material is according to GB/T 3657 magnetically soft alloy dc magnetic energy measurement methods and GB/T 3658 magnetically soft alloy AC magnetism performance measurement methods test: coercivity H >=100Oe; Remanent magnetization Br:0.8T～1.2T, hardness >=600HV.
Comparative example 1
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 950 ℃～1000 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃～750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Prepared novel anti-theft label magnetic material is tested according to GB/T 3657 magnetically soft alloy dc magnetic energy measurement methods and GB/T 3658 magnetically soft alloy AC magnetism performance measurement methods: coercivity H: 20Oe～40Oe, remanent magnetization Br:0.6T～0.7T.
Therefore, temperature is too high in the step (3), and alloying element can volatilize, and magnetic property reduces, and does not reach requirement.
Comparative example 2
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 750 ℃～800 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃～750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Because temperature is low excessively in the step (3), cause follow-up cold rolling processing alloy band cracking, the material micro-crack increases.
Comparative example 3
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃～900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 800 ℃～850 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Prepared novel anti-theft label magnetic material is tested according to GB/T 3657 magnetically soft alloy dc magnetic energy measurement methods and GB/T 3658 magnetically soft alloy AC magnetism performance measurement methods: coercivity H: 10Oe～20Oe, remanent magnetization Br >=1.3T.
Therefore, the temperature in the step (5) is too high, causes that Hc diminishes, Br becomes big, undesirable.
Comparative example 4
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃～900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 650 ℃～700 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Temperature is low excessively, does not reach heat treatment requirements, can't make novel anti-theft label magnetic material of the present invention.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification, must confirm its technical scope according to the claim scope.
Claims (5)
1. novel anti-theft label magnetic material is characterized in that:
The chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%, and Cr is 18.0%～20.0%, and Ni is 3.0%～5.0%, and Mo is 3.5%～4.5%, and all the other are Fe; Thickness is 0.05mm～0.2mm.
2. novel anti-theft label magnetic material as claimed in claim 1 is characterized in that: have following performance: coercivity H >=100Oe, remanent magnetization Br:0.8T～1.2T, hardness >=600HV.
3. the production technology of a novel anti-theft label magnetic material according to claim 1 or claim 2 is characterized in that, adopts cold-rolled steel sheet, coercivity H: 10Oe～20Oe, remanent magnetization Br>=70T; The chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%, and Cr is 18.0%～20.0%, and Ni is 19%～22%, and Mo is 3.5%～4.5%, and all the other are Fe, may further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃～900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃～750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
4. the production technology of novel anti-theft label magnetic material as claimed in claim 3 is characterized in that: described cold-rolled steel sheet thickness is 2.5mm～3.5mm.
5. acoustic magnetic anti-theft label; Comprise long and narrow box body (3), described box body (3) has cavity (5), is provided with a slice magnetic bias sheet (1) and a slice resonance plate (2) at least in the cavity (5); Box body (3) is provided with lid (4); Said magnetic bias sheet (1) and resonance plate (2) are layered arrangement, it is characterized in that: described magnetic bias sheet (1) is claim 1 or 2 described novel anti-theft label magnetic materials, and described resonance plate (2) is a minicrystal soft magnetic material.
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| CN201210050951.0A CN102592771B (en) | 2012-03-01 | 2012-03-01 | Novel antitheft tag magnetic material, production process thereof and acoustic magnetic antitheft tag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464135A (en) * | 2014-09-24 | 2015-03-25 | 北京冶科磁性材料有限公司 | Manufacturing method for soft magnetic vibrating reed applicable to acoustic-magnetic anti-theft label |
| WO2023186160A1 (en) * | 2022-04-02 | 2023-10-05 | Ningbo Signatronic Technologies , Ltd. | Acousto-magnetic (am) anti-theft marker and use thereof |
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| CN1157768A (en) * | 1995-12-18 | 1997-08-27 | 日本钢管株式会社 | Fabrication method of welded steel pipe using dual-phase stainles steel |
| WO2007149135A2 (en) * | 2006-06-16 | 2007-12-27 | Ningbo Signatronic Technologies, Ltd. | Anti-theft security marker with soft magnetic bias component |
| CN102152925A (en) * | 2010-12-07 | 2011-08-17 | 上海华篷防爆科技有限公司 | Stainless steel anti-explosion material for medicaments and foods and preparation method thereof |
| CN102262808A (en) * | 2011-07-15 | 2011-11-30 | 宁波讯强电子科技有限公司 | Acousto-magnetic anti-theft label, and volume label made of same and preparation method thereof |
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2012
- 2012-03-01 CN CN201210050951.0A patent/CN102592771B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1157768A (en) * | 1995-12-18 | 1997-08-27 | 日本钢管株式会社 | Fabrication method of welded steel pipe using dual-phase stainles steel |
| WO2007149135A2 (en) * | 2006-06-16 | 2007-12-27 | Ningbo Signatronic Technologies, Ltd. | Anti-theft security marker with soft magnetic bias component |
| CN102152925A (en) * | 2010-12-07 | 2011-08-17 | 上海华篷防爆科技有限公司 | Stainless steel anti-explosion material for medicaments and foods and preparation method thereof |
| CN102262808A (en) * | 2011-07-15 | 2011-11-30 | 宁波讯强电子科技有限公司 | Acousto-magnetic anti-theft label, and volume label made of same and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104464135A (en) * | 2014-09-24 | 2015-03-25 | 北京冶科磁性材料有限公司 | Manufacturing method for soft magnetic vibrating reed applicable to acoustic-magnetic anti-theft label |
| WO2023186160A1 (en) * | 2022-04-02 | 2023-10-05 | Ningbo Signatronic Technologies , Ltd. | Acousto-magnetic (am) anti-theft marker and use thereof |
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| CN102592771B (en) | 2014-07-30 |
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