CN100424505C - Vortex detecting method of plastic product crack - Google Patents
Vortex detecting method of plastic product crack Download PDFInfo
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- CN100424505C CN100424505C CNB2005101205118A CN200510120511A CN100424505C CN 100424505 C CN100424505 C CN 100424505C CN B2005101205118 A CNB2005101205118 A CN B2005101205118A CN 200510120511 A CN200510120511 A CN 200510120511A CN 100424505 C CN100424505 C CN 100424505C
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Abstract
The present invention discloses a vortex flaw detection method for plastic product cracks. Nanometer straight iron powder or nanometer ferroalloy powder with the weight from 1% to 5% compared with the total weight is admixed to plastic raw material resin, the plastic raw material resin and the nanometer ferroalloy powder are uniformly distributed through stir, and then various products of composite materials which are mixed by plastics and nanometer iron powder are formed by heating. Therefore, the vortex crack flaw detection of the products is directly carried out. When the vortex crack flaw detection is carried out, excitation frequency range for detection is from 100KHz to 1KHz, and the nanometer ferroalloy powder is a mixed body of nanometer straight iron powder and nanometer alloy powder of silicon, iron and boron. The present invention has the advantages of convenient operation, practicality, no change of the production mode of original plastic products, low cost, direct application of a traditional vortex detection mode which is widely used, good effect, and can be widely used for the nondestructive flaw detection of various plastic products in the field of metallurgy, machinery, electricity, chemical engineering, nuclear energy, aerospace, etc. and the crack detection of the quality detection of products.
Description
Technical field
The present invention relates to a kind of eddy current detection method, relate in particular to a kind of eddy-current flaw detecting method of plastic product crack.
Background technology
Being found of vortex phenomenon and electromagnetic induction principle in 19th-century, existing so far nearly bicentenary history just was used for quality of material separator with EDDY CURRENT in 1879, and nineteen twenty-six begins to be used to measure thickness, also uses it for nondestructive examination afterwards.Eddy current detection method is a kind of conventional lossless detection method based on electromagnetic induction principle, and it is applicable to conductive material.But advantages such as detection speed is fast, highly sensitive non-contact detection that eddy current detection method has, fields such as metallurgy, machinery, electric power, chemical industry, nuclear energy, Aero-Space are widely used at aspects such as nondestructive examination, discriminating material, measurement coating thickness, position probing.
But because the theoretical foundation of EDDY CURRENT is electromagnetic induction, must be the material of conduction, magnetic conduction, then can't use eddy current detection method, limit its usable range greatly the plastic or other material that does not have conduction, magnetic conduction according to the object of its principle EDDY CURRENT.
Summary of the invention
The objective of the invention is to: overcome the above-mentioned deficiency of prior art,, be used for the aspect such as crack-detecting, coat thickness detection of plastic products this widely used detection method of EDDY CURRENT.
The object of the invention realizes by following scheme: the 1-5% nanometer straight iron powder or the nanometer ferroalloy powder that mix general assembly (TW) in the plastic raw materials resin, plastic raw materials resin and nanometer ferroalloy powder are by stirring, evenly distribute, then through adding the various goods of thermosetting plastics and nanometer iron powder composite material mixed; Directly said products is carried out the eddy current crack-detecting.
The present invention is when carrying out the eddy current crack-detecting, and detection with the excitation frequency scope is: 100KHz-1MHz.
Nanometer ferroalloy powder of the present invention is the mixture of nanometer straight iron powder and nano-silicon ferroboron powder.
Nanometer straight iron powder of the present invention and nano-silicon ferroboron powder respectively account for 50%.
Because the electromagnetic property of nano material uniqueness, this moment, marked change took place in the electromagnetic property of composite product, became magnetic conduction by magnetic conduction not; When the excitation frequency that this composite product is carried out EDDY CURRENT adopts hundreds of KHz to the 1MHz left and right sides (sensitivity is different and different with excitation frequency), EDDY CURRENT can be equally with other metal materials realized, and crack-detecting can be realized such material product.
The present invention is easy and simple to handle, practical, need not change the mode of production of original plastic products, cost is low, EDDY CURRENT mode traditional, that be widely used can directly be used, effective, the crack detection in the time of can being widely used in the nondestructive examination of various plastic products in fields such as metallurgy, machinery, electric power, chemical industry, nuclear energy, Aero-Space and product quality and detecting.
Embodiment
The present invention is described in detail below in conjunction with embodiment.
Embodiment 1:
Polyamide 6 (be commonly called as nylon 6, PA6) plastics have good physics, mechanical property, pulling strengrth height for example, and excellent in abrasion resistance, toughness is good, and chemical-resistant resistance and oil resistance are outstanding, are most widely used kinds in the five large-engineering plastics.But pure PA6 itself is not only non-conductive but also non-magnetic insulating material, in case crackle appears in its goods inside, eddy current detection method can't detect in real time to it.The present invention evenly mixes 1% nanometer ferroalloy powder of total amount in the polyamide 6 plastic raw materials, described nanometer ferroalloy powder is the mixture of nanometer straight iron powder and nanometer ferrosilicon boron FeSiB alloyed powder, nanometer straight iron powder and nanometer ferrosilicon boron FeSiB alloyed powder respectively account for 50%, form plastics and nanometer ferroalloy powder composite material mixed goods through thermoplastic again.This moment, marked change took place in the electromagnetic property of these composite material plastic goods, became magnetic conduction by magnetic conduction not; Its excitation frequency with 100KHz-1MHz is carried out eddy current test, the quick and easy fine crack that has detected goods.
Embodiment 2
Polyvinylchloride (PVC) mechanical strength height, electric property is good, and the resistibility of acid and alkali-resistance is extremely strong, and chemical stability is fine.Wherein the rigid polyvinyl chloride goods have the valve of pipe and rod, plate, welding rod, centrifugal pump, ventilation blower, petroleum pipeline, acid and alkali pumps and container etc.The present invention evenly mixes 3% nanometer ferroalloy powder of total amount in the igelite raw material, form igelite and nanometer ferroalloy powder composite material mixed goods through heating (thermoplastic), tubing, container and other parts etc., this moment, these composite material plastic goods just can carry out eddy current test to it, the quick and easy fine crack that detects goods.
In Aerospace Engineering, sometimes need be at the ferroalloy compound substance of aircraft surface applied plastic and nano material, but because aircraft moves in the high-altitude rugged surroundings, overlay damages easily, adopt method of the present invention, excitation frequency with high frequency (100KHz-1MHz) is carried out eddy current test, can find whether overlay crackle occurred.
Embodiment 3
Epoxy resin Chang Zuowei binding material uses, adopt method of the present invention, in epoxy resin, evenly mix 5% nanometer pure iron powder of total amount, treat epoxy resin cure after, can carry out eddy current test to the abutting edge, the quick and easy fine crack that detects cemented side seam.
Claims (3)
1. the eddy-current flaw detecting method of a plastic product crack, it is characterized in that: the 1--5% nanometer straight iron powder or the nanometer ferroalloy powder that in the plastic raw materials resin, mix general assembly (TW), plastic raw materials resin and nanometer straight iron powder or nanometer ferroalloy powder are by stirring, evenly distribute, then through adding the various goods of thermosetting plastics and nanometer straight iron powder or nanometer ferroalloy powder composite material mixed, directly said products is carried out the eddy current crack-detecting, when carrying out the eddy current crack-detecting, detection with the excitation frequency scope is: 100KHz-1MHz.
2. the eddy-current flaw detecting method of plastic product crack according to claim 1, it is characterized in that: described nanometer ferroalloy powder is the mixture of nanometer straight iron powder and nano-silicon ferroboron powder.
3. the eddy-current flaw detecting method of plastic product crack according to claim 1 and 2, it is characterized in that: described nanometer straight iron powder and nano-silicon ferroboron powder respectively account for 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101205118A CN100424505C (en) | 2005-12-21 | 2005-12-21 | Vortex detecting method of plastic product crack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101205118A CN100424505C (en) | 2005-12-21 | 2005-12-21 | Vortex detecting method of plastic product crack |
Publications (2)
| Publication Number | Publication Date |
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| CN1793896A CN1793896A (en) | 2006-06-28 |
| CN100424505C true CN100424505C (en) | 2008-10-08 |
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| CNB2005101205118A Expired - Fee Related CN100424505C (en) | 2005-12-21 | 2005-12-21 | Vortex detecting method of plastic product crack |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2128587B1 (en) * | 2008-05-28 | 2018-11-07 | EADS Deutschland GmbH | Irregularity detection in a structure of an aircraft |
| CN102507432B (en) * | 2011-09-29 | 2013-09-25 | 成都发动机（集团）有限公司 | Nondestructive inspection method for turbine disc of aero-turbine engine |
| CN107290426B (en) * | 2017-06-20 | 2021-12-21 | 爱德森（厦门）电子有限公司 | Method for detecting deformation cracks of non-metallic material |
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| CN1793896A (en) | 2006-06-28 |
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