CN106342209B - Detect the method for the not cast metallic membrane Vickers hardness of curved surface shape - Google Patents
Detect the method for the not cast metallic membrane Vickers hardness of curved surface shape Download PDFInfo
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- CN106342209B CN106342209B CN03105559.1A CN03105559A CN106342209B CN 106342209 B CN106342209 B CN 106342209B CN 03105559 A CN03105559 A CN 03105559A CN 106342209 B CN106342209 B CN 106342209B
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- hardness
- graticule
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Abstract
A kind of measuring technique that detects the not cast metallic membrane Vickers hardness of curved surface shape. First (graticule is decile not necessarily, and its institute's region area that marks is 9 × 10 on metallic membrane, to mark net region with graticule2～6×104mm2Between), then each graticule intersection point is carried out to hardness test with the ultrasonic portable hardometer of digital display. Plot the hardness distribution curve along warp and weft direction according to recording each point hardness number, as the foundation of differentiating whole membrane tension situation. Before the test of above-mentioned hardometer, calibrated with reference block, and in this reference block, have support and make its deviation at 2HV during without support Determination of HardnessFWithin. Advantage of the present invention is in the situation that not changing the main state of diaphragm, its hardness of direct-detection on diaphragm. By the hardness situation of expressing whole diaphragm along the hardness curve of graticule direction. Diaphragm through hardness test can use. So not only ensured that detection quality directly, reliably but also reduced cost.
Description
Technical field
The invention belongs to the measuring technique of not cast metallic membrane hardness.
Background technology
The hardness test method of metal material mainly contain Brinell hardness, Rockwell hardness andThree kinds of Vickers hardness test methods. The feature of Brinell hardness test be with diameterLarge steel ball extrudes larger-size impression under large load. Due to tested material examinationThe thickness of sample at least should be 10 times of depth of cup, is therefore not suitable at metallic membraneUpper detection Brinell hardness. Rockwell hardness test is to adopt to measure diamond circular cone or steelBall method of depth of cup on measured material represents material hardness. Because Rockwell is hardDegree loads the hardness requirement of larger measurand at least more than HRC20, and measurement resultPrecision also poor compared with Vickers hardness and Brinell hardness, be therefore also not suitable at metallic membraneUpper detection rockwell hardness testing. Vickers Hardness Test be divided into micro-vickers hardness,Little load Vickers hardness, general three kinds of test methods of Vickers hardness. Metal Vickers hardnessTest method measuring wider range, shows meticulously, and result of the test has higher precision,Can be for the Determination of Hardness of the little sample of test area and workpiece, and thin thicknessThe Determination of Hardness of metal material. While measuring Vickers hardness, require measured surface roughness to beRa0.4, little load Vickers hardness and micro-vickers hardness are Ra0.2. When measurement, wantAsk measured surface parallel with bearing-surface, measured workpiece or sample should be able to firmly be positioned overOn hardometer testing stand. Because metallic membrane surface roughness conventional in engineering reaches notTo 0.2Ra. Some diaphragm watch areas are large, and curvature changes also greatly, often cannot be by itBe placed in and on hardometer testing stand, carry out hardness test. Therefore, carrying out a curved surface shapeWhen the hardness of metallic membrane detects, conventionally diaphragm need to be cut into and meetState the sample of requirement and measure again its Vickers hardness. This will produce two problems: firstBe can bend after metallic membrane is cut into sample, its internal stress will becomeChange, the specimen surface simultaneously cutting off also must just can carry out Vickers hardness survey through polishingExamination. Be difficult to truly to represent metallic membrane last like this hardness the sixth of the twelve Earthly Branches recording from sampleHardness and hardness distribution situation. If the hardness at the each position of metallic membrane is inhomogeneousSituation will be more serious; The secondth, in engineering, there are many large-scale metallic membranes, price is highExpensive high to its hardness detecting reliability requirement, surface state does not allow to change, and does not permit yetPermitted sampling check, require the diaphragm after Determination of Hardness still can use. This is existing hardDegree method of testing is insurmountable. Therefore at present in the urgent need to finding a kind of detection and commentingEstimate curved surface shape metallic membrane hardness situation, particularly large-scale curved shape metallic membrane hardnessThe method of situation.
Summary of the invention
Object of the present invention is exactly in order to overcome the deficiencies in the prior art part, providesA kind of new effective not cast curved surface shape metallic membrane hardness assessment and detectionMethod.
The present invention measures and assesses the side of not cast curved surface shape metallic membrane Vickers hardnessMethod step is as follows:
1) use the material system of the trade mark identical with final molding diaphragm and condition of heat treatmentBecome standard block of hardness. First determine loading force, it determines that principle is not affect diaphragm to makeWith and can meet that Vickers hardness when test determines by the character of material and thickness conditionLoading force. With this loading force, reference block is carried out to hardness ga(u)ge with Vickers subsequentlyFixed. Select again the specification of the ultrasonic portable hardometer probe of digital display with this loading force.
2) with reference block under above-mentioned loading force to the ultrasonic portable hardness of digital displayMeter is calibrated and definite load time.
3) ultrasonic portable hard with above-mentioned test specification check and correction digital display with reference blockDegree meter has support and makes both test the error of indication at 2HV without support Determination of HardnessFIn, to finally use the hardness of measuring diaphragm without support method.
4) curved surface shape metallic membrane surface is divided into grid, net with warp and parallelLattice mark each region area S 9 × 10 on curved surface2～6×104mm2Between.Warp, not necessarily decile of parallel.
5) to diaphragm upper warp and woof line intersection point with more than above-mentioned digital display portable formula hardometerState test specification and carry out hardness test, step is: within the scope of 5mm around intersection point, appointSelect 3 points, get and show hardness data, these three data mean values i.e. network friendship for this reasonPoint hardness test value.
6) record graticule intersection point hardness test value with said method and list film in allIn sheet intersection point hardness test tables of data. In table, laterally the first row is that warp is compiledNumber a1 a2……an, longitudinally first row parallel numbering b1 b2……bm。Crossing space place fills out on this graticule intersection point and records Vickers hardness in length and breadthTest value aibjHVF。
Diaphragm grid intersection point hardness test tables of data
7) make warp direction and weft direction hardness distribution curve by upper table.
8) just can be to the hardness situation of metallic membrane from above-mentioned hardness distribution curveMake an appraisal, and the Main Basis of selecting as diaphragm specification of heat treatment. Finally by goldBelong to the hardness distribution curve of the actual tests result examination of diaphragm, just can be as detectingProduce the whether qualified criterion of membrane tension later.
First advantage of the present invention is that this detection method is a kind of utmost point microlesionDetect. Hardness does not need to change membrane surface state while detection. Diaphragm through measure after stillCan use. This has not only improved economic benefit, the more important thing is due to useMetallic membrane through direct-detection but not sampling Detection, thereby improved diaphragm qualityReliability. Next is not need curved surface shape metallic membrane to be cut into after sampleCome again sample to carry out hardness test. So just keep the state of final molding diaphragmConstant, avoid because cutting causes diaphragm material internal stress to change and processes polishing and makeBecome test surfaces to harden hardness number test error that these two factors cause. Of the present inventionThe 3rd advantage is can be according to warp-wise on diaphragm and broadwise hardness distribution curve to metalHardness situation on diaphragm is made direct, correct thoroughly evaluating. This is curved surface shape filmThe important evidence that sheet moulding process and subsequently specification of heat treatment are selected is also that criterion is finalThe foundation whether metallic membrane of producing is qualified.
Brief description of the drawings
Fig. 1 to Fig. 4 is the schematic diagram of this method invention. Below with reference to accompanying drawing pairThe present invention is further described.
Fig. 1 is warp direction hardness distribution curve of the present invention. On coordinate plane,Ordinate is hardness number HVF. Abscissa is that parallel numbering is arranged b1、b2……bm-1bm。On coordinate plane, mark a1b1HVF，a1b2HVF……a1bm-1HVF、a1bmHVF is eachPoint. These points are linked up, a1The hardness distribution curve of warp direction.Make the hardness distribution curve of n bar warp direction with this.
Fig. 2 is weft direction hardness distribution curve of the present invention. On coordinate plane,Ordinate is hardness number HVF. Abscissa is that warp numbering is arranged a1、a2……an-1an。On coordinate plane, mark a1b1HVF，a2b1HVF……an-1b1HVF、anb1HVF is eachPoint. These points are linked up, b1The hardness distribution curve of weft direction.Make the hardness distribution curve of m bar weft direction with this.
Fig. 3 is embodiment metallic membrane front view. Fine rule is drawn graticule.
Fig. 4 is embodiment metallic membrane top view. Fine rule is drawn graticule.
Specific implementation method
Embodiments of the invention are 2 space flight to being numbered 970212,970207Diameter in propellant tank is that the hemisphere metallic membrane of 800mm detects, and sees figure3. The material of manufacturing diaphragm is L3 aluminium sheet, and diaphragm thickness is between 2.2～3.0mm.Its production process route is: stretching+Vehicle Processing moulding+heat treatment. Its rough surfaceDegree is about Ra1.6. The actual method detecting is as follows:
1) use through annealing L3 aluminium bar and make standard block of hardness, hard with little load VickersDegree meter is demarcated its hardness with 8.8N loading force, and the mean value recording is 20.6,Uniformity < 4% (in ф 26mm).
2) with above-mentioned reference block, the ultrasonic portable hardometer of digital display is being loadedUnder condition (loading force 8.8N, the load time is 5 seconds), calibrate.
3) with reference block to the ultrasonic portable hardometer of digital display have support andWithout support Determination of Hardness. Both test values of result are all at 19HV8.8N～21HV8.8NErrorAt 2HVFIn
4) on hemisphere face, mark be numbered 1,2,3 ... 8, bar warp;Mark again and be numbered 40,80,160,240,320,400 6 parallels, see attachedFig. 4, Fig. 5.
5) at diaphragm grid intersection point place by the ultrasonic portable Vickers hardness of above-mentioned digital displayIt is hard without support that meter is carried in around intersection point within the scope of 5mm optional 3 row by 8.8N powerDegree test, these three data mean values are under grid intersection point hardness test value is shown in for this reasonTable.
970212 diaphragm grid intersection point hardness test tables of data
970207 diaphragm grid intersection point hardness test tables of data
6) make weft direction hardness curve warp direction hardness curve
7) we find 970212 films to analyze these 2 membrane tension curve distribution situationsSheet, warp-wise broadwise hardness curve is distributed in 14HV8.8N～20HV8.8NBetween, and 970207Membrane tension curve distribution is at 20HV8.8N～28HV8.8NBetween. 970207 films as a resultSheet stands a load and just lost efficacy. And what 970212 diaphragms can stand repeatedly to carry repeatedlyUse. We just can be 970212 diaphragm warp-wises like this, and broadwise hardness curve dividesCloth situation is as the foundation of diaphragm control process and hardness detection. Press this according to inspectionDiaphragm after survey is participated in repeatedly flight test and is all succeeded.
Claims (3)
1. detect a method for the not cast metallic membrane Vickers hardness of curved surface shape, itsBefore being characterised in that measurement, first on metallic membrane, mark net region with graticule, soRear pair warp and weft line intersection point directly carries out hardness measurement with the ultrasonic portable hardometer of digital display,Like this ensureing to detect under the prerequisite that front diaphragm main state is constant with warp direction andThe hardness curve of weft direction, as differentiating the whether qualified foundation of membrane tension.
2. according to claim 1, it is characterized in that not necessarily decile of graticule, its instituteMark region area 9 × 102～6×104mm2Between.
3. according to claim 1 and right 2, it is characterized in that measuring metallic membrane netWhen the hardness of lattice graticule intersection point, the ultrasonic portable hardometer of digital display used not onlyCalibrate with the reference block of demarcating, and this hardometer is enterprising in reference blockWent support and without support Determination of Hardness, and made both deviations at 2HVFWithin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03105559.1A CN106342209C (en) | 2003-02-10 | 2003-02-10 | Method for testing Vickers hardness of curved non-cast metal diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03105559.1A CN106342209C (en) | 2003-02-10 | 2003-02-10 | Method for testing Vickers hardness of curved non-cast metal diaphragm |
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| Publication Number | Publication Date |
|---|---|
| CN106342209B true CN106342209B (en) | 2005-04-13 |
| CN106342209C CN106342209C (en) | 2005-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03105559.1A Expired - Fee Related CN106342209C (en) | 2003-02-10 | 2003-02-10 | Method for testing Vickers hardness of curved non-cast metal diaphragm |
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| CN (1) | CN106342209C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323299A (en) * | 2018-12-14 | 2020-06-23 | 有研工程技术研究院有限公司 | Performance uniformity evaluation method suitable for large-size aluminum alloy section |
| CN112162078A (en) * | 2020-09-23 | 2021-01-01 | 西安热工研究院有限公司 | On-site detection method for repair welding area of outer surface of high-temperature and high-pressure pipe fitting |
-
2003
- 2003-02-10 CN CN03105559.1A patent/CN106342209C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323299A (en) * | 2018-12-14 | 2020-06-23 | 有研工程技术研究院有限公司 | Performance uniformity evaluation method suitable for large-size aluminum alloy section |
| CN112162078A (en) * | 2020-09-23 | 2021-01-01 | 西安热工研究院有限公司 | On-site detection method for repair welding area of outer surface of high-temperature and high-pressure pipe fitting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR03 | Grant of secret patent right | ||
| DC01 | Secret patent status has been lifted | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050413 Termination date: 20170210 |