CN112834330A - Method for measuring deformation resistance of enamel layer on surface of enameled steel plate - Google Patents
Method for measuring deformation resistance of enamel layer on surface of enameled steel plate Download PDFInfo
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- CN112834330A CN112834330A CN201911155850.8A CN201911155850A CN112834330A CN 112834330 A CN112834330 A CN 112834330A CN 201911155850 A CN201911155850 A CN 201911155850A CN 112834330 A CN112834330 A CN 112834330A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a method for measuring the deformation resistance of an enamel layer on the surface of an enamel steel plate, which comprises the following steps: stretching, measuring the conductivity, calculating the deformation resistance and the like. According to the method for measuring the deformation resistance of the enamel layer on the surface of the enamel steel plate, the stress and strain values of the enamel workpiece can be quantitatively measured in a load loading mode, and a quantitative design basis is provided for the design of an enamel structural part. By means of the curve change of the conductivity change, the strain critical value generated by the micro cracks of the porcelain layer on the surface of the enamel plate can be quickly and effectively evaluated. Through the real-time data monitoring of the strain value and the conductivity, the deformation resistance of various ceramic layer formulas can be measured, instead of only detecting a sample in a certain state, and the test result has high repeatability and high reliability. The method provides advanced data for the design of the enamel product, can be used as an evaluation method for sample verification, and can further guarantee the service life of the enamel product.
Description
Technical Field
The invention relates to a method for measuring the deformation resistance of an enamel layer on the surface of an enamel steel plate, belonging to the technical field of metal enamel.
Background
And (3) forming and processing the hot rolled steel plate into a bottom blank with a required shape, and enameling and sintering the surface of the bottom blank to obtain a required hot rolled enamel steel product. The product has the advantages of good corrosion resistance, insulation, heat resistance, corrosion resistance, high safety and the like, and increasingly becomes a raw material choice for light industry, household appliances, architectural decoration and environmental protection products.
The main defects of the enamel steel product comprise scale explosion, poor adhesion, pinholes and the like, which can be found in a static state. In the process of serving or using the enameled steel after being made into parts or formed into final products, dynamic load and even cyclic load are inevitably required to be borne. Because the enamel layer is brittle, once the surface layer of the product fails under the action of dynamic load, such as breakage, peeling and the like, the final product fails, and serious after-sale quality problems are caused. Therefore, the service condition of the final product needs to be considered when the product is designed, and the product structure is designed based on the deformation resistance of the enamel layer. It is important to obtain the data of the deformation resistance of the enamel layer, which is a difficult point.
The patent publication CN107941817A discloses a comprehensive detection system for surface defects on the inner surface of an enamel liner based on the combination of visual detection and mechanical transmission, which can present the surface defects of the liner in an image manner and can automatically identify the defects. The system can only detect the defects which can be found under the visual condition, namely, the manual visual detection is essentially upgraded to a defect detection system.
The patent publication No. CN103983666B discloses a no-ground-wire non-conductive coating electric spark detection device, which is characterized in that a copper wire brush with high voltage is swept on the surface of a coating, when a pinhole is formed on the surface of the coating, the high voltage breaks through air to form electric sparks, and thus the pinhole defect of the coating quality is detected. The device and the method are used for detecting the pinhole defect of the coating with the gap, can not detect the condition that the coating is separated from the substrate but not peeled off, and have larger high-voltage electric danger.
Disclosure of Invention
The invention aims to solve the technical problems that: the method for measuring the deformation resistance of the enamel layer on the surface of the enameled steel plate overcomes the defects of the technology.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for measuring the deformation resistance of an enamel layer on the surface of an enamel steel plate comprises the following steps:
(1) vertically placing the enameled pressed steel to be tested, and clamping two ends of the enameled pressed steel to be tested by using a drawing machine; solution pools are arranged on two sides of the enameled pressed steel to be detected; the liquid in the solution pool contacts two sides of the enameled pressed steel to be measured; two probes of the conductivity meter are respectively arranged in solution pools at two sides of the enameled pressed steel to be measured;
(2) starting the stretcher to stretch the enameled pressed steel to be tested; the conductivity meter obtains conductivity in the stretching process;
(3) drawing a strain-current curve graph according to the stretching amount and the conductivity of the stretcher and the size of the enamel steel plate to be measured;
(4) and the strain corresponding to the mutation point of the strain-current curve graph is the deformation resistance threshold value of the surface enamel layer of the enamel steel plate to be detected.
The scheme is further improved in that: the discontinuity point of the strain-current graph is 5% of the difference between the steady current and the initial current.
The scheme is further improved in that: the liquid in the solution pool is conductive solution.
According to the method for measuring the deformation resistance of the enamel layer on the surface of the enamel steel plate, the stress and strain values of the enamel workpiece can be quantitatively measured in a load loading mode, and a quantitative design basis is provided for the design of an enamel structural part. By means of the curve change of the conductivity change, the strain critical value generated by the micro cracks of the porcelain layer on the surface of the enamel plate can be quickly and effectively evaluated. Through the real-time data monitoring of the strain value and the conductivity, the deformation resistance of various ceramic layer formulas can be measured, instead of only detecting a sample in a certain state, and the test result has high repeatability and high reliability. The method provides advanced data for the design of the enamel product, can be used as an evaluation method for sample verification, and can further guarantee the service life of the enamel product.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic diagram of a test apparatus used in a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of the structure of the enameled steel plate to be tested in a preferred embodiment of the present invention.
FIG. 3 is a graph of strain versus current obtained in a preferred embodiment of the invention.
Detailed Description
Examples
The method for measuring the deformation resistance of the enamel layer on the surface of the enameled steel plate of the embodiment uses a testing device as shown in figure 1, and comprises a stretcher 1 with a longitudinal extensometer 2, a special conductivity meter 4 with a seal 5 and a set of central data processor 8. The enameled pressed steel to be measured is vertically placed on the stretcher 1, the solution pool 6 is divided into two parts which are respectively placed on two sides of the enameled pressed steel to be measured, the enameled pressed steel to be measured is used as a medium and is in contact with the solution pool 6 through the flexible seal 5, the enameled pressed steel to be measured can move up and down while the solution in the solution pool 6 is sealed, and the liquid in the solution pools on two sides is in contact with the side surface of the enameled pressed steel to be measured; two probes 4 of the conductivity meter are arranged above two parts of the solution tank 6 through a bracket respectively, and the probes 4 extend into the liquid in the solution tank 6. The liquid in the solution pool 6 is a conductive solution, such as a saturated potassium chloride solution.
The conductivity meter may feed back the time and conductivity values to the central data processor 7 in real time. When the ceramic layer has micro cracks, the cracks can not be completely closed due to the action of tensile tension, a signal of conductivity change can be obtained under the action of the flowing of water, and the stretcher 1 and the conductivity meter are simultaneously connected with the central data processor 7.
The method for measuring the deformation resistance of the enamel layer on the surface of the enameled steel plate comprises the following steps:
(1) vertically placing the enameled pressed steel to be detected, and clamping two ends of the enameled pressed steel to be detected by using corresponding clamping mechanisms 3; as shown in fig. 2, two ends of the enameled pressed steel to be tested are provided with corresponding bulges so as to be convenient for clamping, and test liquid is injected into the solution pool 6;
(2) starting a longitudinal extensometer to stretch the enameled pressed steel to be measured; the conductivity meter obtains the conductivity in the stretching process;
(3) drawing a strain-current curve graph according to the stretching amount and the conductivity of the longitudinal extensometer and the size of the enamel steel plate to be measured;
(4) and the strain corresponding to the mutation point of the strain-current curve diagram is the deformation resistance threshold value of the enamel layer on the surface of the enamel steel plate to be detected.
As shown in fig. 3, the current in the initial state is I0, and the current after stabilization is I1; the strain-current curve has a mutation point of (I1-I0) × 5%.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (3)
1. The method for measuring the deformation resistance of the enamel layer on the surface of the enameled steel plate is characterized by comprising the following steps of:
(1) vertically placing the enameled pressed steel to be tested, and clamping two ends of the enameled pressed steel to be tested by using a drawing machine; solution pools are arranged on two sides of the enameled pressed steel to be detected; the liquid in the solution pool contacts two sides of the enameled pressed steel to be measured; two probes of the conductivity meter are respectively arranged in solution pools at two sides of the enameled pressed steel to be measured;
(2) starting the stretcher to stretch the enameled pressed steel to be tested; the conductivity meter obtains conductivity in the stretching process;
(3) drawing a strain-current curve graph according to the stretching amount and the conductivity of the longitudinal extensometer and the size of the enamel steel plate to be measured;
(4) and the strain corresponding to the mutation point of the strain-current curve graph is the deformation resistance threshold value of the surface enamel layer of the enamel steel plate to be detected.
2. The method for measuring the deformation resistance of the enamel layer on the surface of the enamel steel plate according to the claim 1, which is characterized in that: the discontinuity point of the strain-current graph is 5% of the difference between the steady current and the initial current.
3. The method for measuring the deformation resistance of the enamel layer on the surface of the enamel steel plate according to the claim 1, which is characterized in that: the liquid in the solution pool is conductive solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911155850.8A CN112834330B (en) | 2019-11-22 | 2019-11-22 | Method for measuring deformation resistance of enamel layer on surface of enameled steel plate |
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| CN201911155850.8A CN112834330B (en) | 2019-11-22 | 2019-11-22 | Method for measuring deformation resistance of enamel layer on surface of enameled steel plate |
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| CN112834330A true CN112834330A (en) | 2021-05-25 |
| CN112834330B CN112834330B (en) | 2022-10-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7385128B2 (en) | 2020-03-31 | 2023-11-22 | 日本製鉄株式会社 | Deformation resistance calculation method, deformation resistance calculation device, and deformation resistance calculation program |
Citations (6)
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|---|---|---|---|---|
| JP2000214059A (en) * | 1999-01-27 | 2000-08-04 | Saginomiya Seisakusho Inc | Control method for sample test machine |
| CN102087262A (en) * | 2010-07-08 | 2011-06-08 | 石家庄正中科技有限公司 | Device and method for detecting enamel fish scaling |
| CN104297299A (en) * | 2014-09-10 | 2015-01-21 | 中昊晨光化工研究院有限公司 | Quality detection method of nonconductive internal coating of lining pipe with metal outer-wall |
| CN108398320A (en) * | 2018-01-24 | 2018-08-14 | 航天科工防御技术研究试验中心 | A kind of measurement method of wrought aluminium alloy tensile stress etching |
| CN109212004A (en) * | 2017-06-30 | 2019-01-15 | 宝山钢铁股份有限公司 | Hydrogen experimental detection device and detection method are surveyed in the quick-fried performance drain of glassed steel squama |
| CN110044806A (en) * | 2019-05-13 | 2019-07-23 | 中国民航大学 | Image, sound emission, electrochemistry integrated stress corrosion cracking in-situ testing device |
-
2019
- 2019-11-22 CN CN201911155850.8A patent/CN112834330B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000214059A (en) * | 1999-01-27 | 2000-08-04 | Saginomiya Seisakusho Inc | Control method for sample test machine |
| CN102087262A (en) * | 2010-07-08 | 2011-06-08 | 石家庄正中科技有限公司 | Device and method for detecting enamel fish scaling |
| CN104297299A (en) * | 2014-09-10 | 2015-01-21 | 中昊晨光化工研究院有限公司 | Quality detection method of nonconductive internal coating of lining pipe with metal outer-wall |
| CN109212004A (en) * | 2017-06-30 | 2019-01-15 | 宝山钢铁股份有限公司 | Hydrogen experimental detection device and detection method are surveyed in the quick-fried performance drain of glassed steel squama |
| CN108398320A (en) * | 2018-01-24 | 2018-08-14 | 航天科工防御技术研究试验中心 | A kind of measurement method of wrought aluminium alloy tensile stress etching |
| CN110044806A (en) * | 2019-05-13 | 2019-07-23 | 中国民航大学 | Image, sound emission, electrochemistry integrated stress corrosion cracking in-situ testing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7385128B2 (en) | 2020-03-31 | 2023-11-22 | 日本製鉄株式会社 | Deformation resistance calculation method, deformation resistance calculation device, and deformation resistance calculation program |
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