CN103412050A - Device and acquisition method for ultrasonically measuring spheroidization rate of spheroidal graphite cast iron - Google Patents
Device and acquisition method for ultrasonically measuring spheroidization rate of spheroidal graphite cast iron Download PDFInfo
- Publication number
- CN103412050A CN103412050A CN2013103899895A CN201310389989A CN103412050A CN 103412050 A CN103412050 A CN 103412050A CN 2013103899895 A CN2013103899895 A CN 2013103899895A CN 201310389989 A CN201310389989 A CN 201310389989A CN 103412050 A CN103412050 A CN 103412050A
- Authority
- CN
- China
- Prior art keywords
- cast iron
- piezoelectric wafer
- ultrasound
- graphite cast
- voltage signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to a device and an acquisition method for ultrasonically measuring the spheroidization rate of spheroidal graphite cast iron, belonging to the fields of casting and metallurgy. The device and the acquisition method are used for solving the problems that the 100% measurement and the nondestructive detection cannot be realized while the spheroidization rate of the spheroidal graphite cast iron is measured by utilizing a metallographic phase method. The device comprises a linear displacement sensor, an ultrasonic wave receiving piezoelectric crystal plate, an ultrasonic wave emitting piezoelectric crystal plate, an arbitrary waveform generator, a digital oscilloscope and a computer, wherein the ultrasonic wave receiving piezoelectric crystal plate and the ultrasonic wave emitting piezoelectric crystal plate are respectively arranged on two opposite sides of a to-be-measured spheroidal graphite cast iron part, and the linear displacement sensor is clamped at one side, provided with the ultrasonic wave receiving piezoelectric crystal plate, of the to-be-measured cast iron part; the computer automatically monitors and displays the propagation time of an ultrasonic wave in the spheroidal graphite cast iron and the thickness of a spheroidal graphite cast iron part in the propagation direction of the ultrasonic wave and calculates the propagation speed of the ultrasonic wave in the spheroidal graphite cast iron part, so as to acquire the spheroidization rate of the to-be-measured spheroidal graphite cast iron part.
Description
Technical field
The present invention relates to device and the acquisition methods of ultrasonic measurement nodular cast iron balls rate, belong to casting and field of metallurgy.
Background technology
The advantage such as that spheroidal-graphite cast iron has is higher than strength of gray cast iron, length growth rate good and heat resistance is good, be used widely in recent years in machinery industry.One of important performance assessment criteria of spheroidal-graphite cast iron castability is exactly its nodularization rate.At present, the method for measuring the nodular cast iron balls rate has a lot, as metallographic method, audio frequency method, thermal analysis system etc.Wherein, metallographic method is the method for testing of commonly using the most, and its process comprises: from coupon or foundry goods body, cut sample, sample rubbing down, burn into microscope and see and look into etc.Workload is larger, can only carry out sampling Detection, is not suitable for producing in enormous quantities carrying out 100% detection.Therefore, the method is brought significant limitation to the 100% nodularization rate of measuring spheroidal-graphite cast iron real-time.In addition, in metallographic method, in manufacture coupon process, poring rate depends on operator's experience to a great extent, and it is identical that pouring condition is difficult to keep.While for foundry goods itself, detecting, foundry goods need to be destroyed, the condition of Non-Destructive Testing can't be reached.
Summary of the invention
The present invention seeks to adopt metallographic method to measure the nodular cast iron balls rate to have the problem that can't 100% detects, can't reach Non-Destructive Testing, a kind of device and acquisition methods of ultrasonic measurement nodular cast iron balls rate is provided in order to solve.
The device of ultrasonic measurement nodular cast iron balls rate of the present invention, it comprises linear displacement transducer, receives the ultrasound piezoelectric wafer, launches ultrasound piezoelectric wafer, AWG (Arbitrary Waveform Generator), digital oscilloscope and computing machine;
The relative both sides of spheroidal-graphite cast iron part to be measured arrange respectively and receive ultrasound piezoelectric wafer and emission ultrasound piezoelectric wafer, at spheroidal-graphite cast iron part to be measured, a side clamping that receives the ultrasound piezoelectric wafer is set linear displacement transducer is set;
The emission random wave control end of computing machine can be held and be connected with the beginning of AWG (Arbitrary Waveform Generator);
The random wave output terminal of AWG (Arbitrary Waveform Generator) is connected with the random wave input end of emission ultrasound piezoelectric wafer;
The ultrasound wave output terminal of emission ultrasound piezoelectric wafer is connected with the ultrasound wave input end that receives the ultrasound piezoelectric wafer by spheroidal-graphite cast iron part to be measured;
The voltage signal output end that receives the ultrasound piezoelectric wafer is connected with the reception ultrasound piezoelectric wafer voltage signal input part of digital oscilloscope;
The voltage signal output end of emission ultrasound piezoelectric wafer is connected with the emission ultrasound piezoelectric wafer voltage signal input part of digital oscilloscope;
The piezoelectric chip voltage signal output end of digital oscilloscope is connected with the piezoelectric chip signal input part of computing machine;
The displacement signal output terminal of the ultrasound wave of linear displacement transducer in spheroidal-graphite cast iron part to be measured is connected with the displacement signal input end of computing machine.
Based on the nodular cast iron balls rate acquisition methods of the device of described ultrasonic measurement nodular cast iron balls rate, the method comprises the following steps:
Simultaneously, linear displacement transducer is measured the spread length l of ultrasound wave at spheroidal-graphite cast iron part to be measured,
By computer monitoring, received the mistiming t of ultrasound piezoelectric wafer and emission ultrasound piezoelectric wafer generation voltage signal;
Step 4, obtain the velocity of propagation v of ultrasound wave in spheroidal-graphite cast iron part to be measured according to formula v=l/t;
Table 1 nodular cast iron balls rate and ultrasonic propagation velocity relation table
| Ultrasonic propagation velocity ν (m/s) | Nodular cast iron balls rate %) |
| 5703 | 98.1 |
| 5675 | 96.3 |
| 5664 | 95.0 |
| 5657 | 93.4 |
| 5652 | 90.5 |
| 5651 | 90.2 |
| 5647 | 89.3 |
| 5646 | 88.5 |
| 5628 | 85.2 |
| 5593 | 81.9 |
| 5518 | 80.1 |
| 5407 | 78.7 |
| 5276 | 75.9 |
| 5063 | 70.6 |
| 4852 | 65.4 |
| 4635 | 61.4 |
| 4470 | 55.3 |
| 4275 | 52.7 |
Advantage of the present invention: the present invention adopts the method for " measuring ultrasound wave in magnesium iron internal communication speed " to measure in real time the nodularization rate of spheroidal-graphite cast iron, and the method has obvious superiority than original metallographic method of testing.The effect that the method produces is that 100% pair of tested part detects real-time, and tested part is not damaged and guaranteed Non-Destructive Testing.
The accompanying drawing explanation
Fig. 1 is the device of ultrasonic measurement nodular cast iron balls rate of the present invention and the structural representation of acquisition methods.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the device of the described ultrasonic measurement nodular cast iron balls of present embodiment rate, it comprises linear displacement transducer 1, receives ultrasound piezoelectric wafer 3, launches ultrasound piezoelectric wafer 4, AWG (Arbitrary Waveform Generator) 5, digital oscilloscope 6 and computing machine 7;
The relative both sides of spheroidal-graphite cast iron part 2 to be measured arrange respectively and receive ultrasound piezoelectric wafer 3 and emission ultrasound piezoelectric wafer 4, at spheroidal-graphite cast iron part 2 to be measured, a side clamping that receives ultrasound piezoelectric wafer 3 is set linear displacement transducer 1 is set;
The emission random wave control end of computing machine 7 can be held and be connected with the beginning of AWG (Arbitrary Waveform Generator) 5;
The random wave output terminal of AWG (Arbitrary Waveform Generator) 5 is connected with the random wave input end of emission ultrasound piezoelectric wafer 4;
The ultrasound wave output terminal of emission ultrasound piezoelectric wafer 4 is connected with the ultrasound wave input end that receives ultrasound piezoelectric wafer 3 by spheroidal-graphite cast iron part 2 to be measured;
The voltage signal output end that receives ultrasound piezoelectric wafer 3 is connected with the reception ultrasound piezoelectric wafer voltage signal input part of digital oscilloscope 6;
The voltage signal output end of emission ultrasound piezoelectric wafer 4 is connected with the emission ultrasound piezoelectric wafer voltage signal input part of digital oscilloscope 6;
The piezoelectric chip voltage signal output end of digital oscilloscope 6 is connected with the piezoelectric chip signal input part of computing machine 7;
The displacement signal output terminal of the ultrasound wave of linear displacement transducer 1 in spheroidal-graphite cast iron part to be measured is connected with the displacement signal input end of computing machine 7.
Receive between ultrasound piezoelectric wafer 3, emission ultrasound piezoelectric wafer 4 and spheroidal-graphite cast iron part 2 to be measured and fill ultrasonic gel, form close contact.
Embodiment two: based on the nodular cast iron balls rate acquisition methods of the device of the described ultrasonic measurement nodular cast iron balls of embodiment one rate, the method comprises the following steps:
Simultaneously, linear displacement transducer 1 is measured the spread length l of ultrasound wave at spheroidal-graphite cast iron part 2 to be measured,
By computing machine 7 monitorings, received the mistiming t of ultrasound piezoelectric wafer 3 and emission ultrasound piezoelectric wafer 4 generation voltage signals;
Step 4, obtain the velocity of propagation v of ultrasound wave in spheroidal-graphite cast iron part 2 to be measured according to formula v=l/t;
Table 1 nodular cast iron balls rate and ultrasonic propagation velocity relation table
The random wave that Arbitrary Waveform Generator 5 sends is that frequency is the sine wave of 5MHz.
The ultrasound wave that emission ultrasound piezoelectric wafer 4 sends is the ultrasonic longitudinal wave of 5MHz.
Receiving ultrasound piezoelectric wafer 3 and launching ultrasound piezoelectric wafer 4 generation voltage signals is μ V magnitude voltage signals.
Principle of work:
Computing machine 7 sends control signal, open AWG (Arbitrary Waveform Generator) 5 and digital oscilloscope 6, waveform generator 5 produces the driving voltage signal, and be applied to that on emission ultrasound piezoelectric wafer 4, to produce frequency be the ultrasonic longitudinal wave of 5MHz, ultrasonic longitudinal wave is transmitted to and receives on ultrasound piezoelectric wafer 3 through spheroidal-graphite cast iron part 2, and being converted to corresponding microvolt magnitude voltage signals, this voltage signal, by digital oscilloscope 6 monitorings, record, is then delivered to computing machine 7; Simultaneously, the voltage signal produced on emission ultrasound piezoelectric wafer 4 is also delivered to computing machine 7 after digital oscilloscope 6 records.Linear displacement transducer 1 is converted to voltage signal by the length dimension of the spheroidal-graphite cast iron part 2 of ultrasonic propagation direction, and delivers to computing machine 7.
Computing machine 7 receives three kinds of signals, be respectively the voltage signal that receives ultrasound piezoelectric wafer 3, the voltage signal of emission ultrasound piezoelectric wafer 4, the voltage signal of linear displacement transducer 1, computing machine 7 calculates ultrasound wave at the travel-time of spheroidal-graphite cast iron inside parts t according to the voltage signal on the voltage signal on the emission ultrasound piezoelectric wafer 4 received and reception ultrasound piezoelectric wafer 3, the voltage signal of sending here according to linear displacement transducer 1 calculates the length dimension l of spheroidal-graphite cast iron part on the ultrasonic propagation direction, then according to v=l/t, automatically calculate ultrasound wave velocity of propagation in magnesium iron, and according to the cast pieces of spheroidal nodularization rate of being set up by experiment shown in table 1 and the relation of ultrasonic propagation velocity, through look-up table, automatically try to achieve the nodularization rate of tested cast pieces of spheroidal.
Claims (5)
1. the device of ultrasonic measurement nodular cast iron balls rate, it is characterized in that, it comprises linear displacement transducer (1), receives ultrasound piezoelectric wafer (3), launches ultrasound piezoelectric wafer (4), AWG (Arbitrary Waveform Generator) (5), digital oscilloscope (6) and computing machine (7);
The relative both sides of spheroidal-graphite cast iron part to be measured (2) arrange respectively and receive ultrasound piezoelectric wafer (3) and emission ultrasound piezoelectric wafer (4), at spheroidal-graphite cast iron part to be measured (2), a side clamping that receives ultrasound piezoelectric wafer (3) is set linear displacement transducer (1) is set;
The emission random wave control end of computing machine (7) can be held and be connected with the beginning of AWG (Arbitrary Waveform Generator) (5);
The random wave output terminal of AWG (Arbitrary Waveform Generator) (5) is connected with the random wave input end of emission ultrasound piezoelectric wafer (4);
The ultrasound wave output terminal of emission ultrasound piezoelectric wafer (4) is connected with the ultrasound wave input end that receives ultrasound piezoelectric wafer (3) by spheroidal-graphite cast iron part to be measured (2);
The voltage signal output end that receives ultrasound piezoelectric wafer (3) is connected with the reception ultrasound piezoelectric wafer voltage signal input part of digital oscilloscope (6);
The voltage signal output end of emission ultrasound piezoelectric wafer (4) is connected with the emission ultrasound piezoelectric wafer voltage signal input part of digital oscilloscope (6);
The piezoelectric chip voltage signal output end of digital oscilloscope (6) is connected with the piezoelectric chip signal input part of computing machine (7);
The displacement signal output terminal of the ultrasound wave of linear displacement transducer (1) in spheroidal-graphite cast iron part to be measured is connected with the displacement signal input end of computing machine (7).
2. based on the nodular cast iron balls rate acquisition methods of the device of the described ultrasonic measurement nodular cast iron balls of claim 1 rate, it is characterized in that, the method comprises the following steps:
Step 1, computing machine (7) are controlled AWG (Arbitrary Waveform Generator) (5) and are sent the driving voltage signal of random waveform as emission ultrasound piezoelectric wafer (4);
Step 2, emission ultrasound piezoelectric wafer (4) produce ultrasound wave based on piezoelectric effect by described driving voltage signal conversion, and described ultrasound wave passes spheroidal-graphite cast iron part to be measured (2), and receive by receiving ultrasound piezoelectric wafer (3);
Simultaneously, linear displacement transducer (1) is measured the spread length l of ultrasound wave at spheroidal-graphite cast iron part to be measured (2),
Step 3, reception ultrasound piezoelectric wafer (3) are converted to voltage signal based on the ultrasound wave that inverse piezoelectric effect will receive, the voltage signal at this voltage signal and emission ultrasound piezoelectric wafer (4) two ends is all in the upper respective waveforms that shows of digital oscilloscope (6), and send to computing machine (7)
By computing machine (7) monitoring, received the mistiming t of ultrasound piezoelectric wafer (3) and emission ultrasound piezoelectric wafer (4) generation voltage signal;
Step 4, obtain the velocity of propagation v of ultrasound wave in spheroidal-graphite cast iron part to be measured (2) according to formula v=l/t;
Step 5, the velocity of propagation v obtained according to step 4, and question blank 1 obtains the nodularization rate of spheroidal-graphite cast iron part to be measured (2):
Table 1 nodular cast iron balls rate and ultrasonic propagation velocity relation table
3. the acquisition methods of ultrasonic measurement nodular cast iron balls rate according to claim 2, is characterized in that, the random wave that Arbitrary Waveform Generator 5 sends is that frequency is the sine wave of 5MHz.
4. the acquisition methods of ultrasonic measurement nodular cast iron balls rate according to claim 3, is characterized in that, the ultrasound wave that emission ultrasound piezoelectric wafer (4) sends is the ultrasonic longitudinal wave of 5MHz.
5. the acquisition methods of ultrasonic measurement nodular cast iron balls rate according to claim 2, is characterized in that, receives ultrasound piezoelectric wafer (3) and emission ultrasound piezoelectric wafer (4) generation voltage signal is μ V magnitude voltage signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103899895A CN103412050A (en) | 2013-08-30 | 2013-08-30 | Device and acquisition method for ultrasonically measuring spheroidization rate of spheroidal graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103899895A CN103412050A (en) | 2013-08-30 | 2013-08-30 | Device and acquisition method for ultrasonically measuring spheroidization rate of spheroidal graphite cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103412050A true CN103412050A (en) | 2013-11-27 |
Family
ID=49605076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103899895A Pending CN103412050A (en) | 2013-08-30 | 2013-08-30 | Device and acquisition method for ultrasonically measuring spheroidization rate of spheroidal graphite cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103412050A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391043A (en) * | 2014-12-10 | 2015-03-04 | 哈尔滨理工大学 | Device for ultrasonically detecting creep ratio of vermicular graphite cast iron with any size and using method of device |
| CN104483386A (en) * | 2014-12-24 | 2015-04-01 | 哈尔滨理工大学 | Device for rapidly predicating carbon saturation degree of gray cast iron and method for acquiring carbon saturation degree of gray cast iron |
| CN105158340A (en) * | 2015-09-18 | 2015-12-16 | 宁夏共享集团股份有限公司 | Detection method for spheroidization rate of ferrite ball-milling cast iron body of gas turbine |
| CN105785882A (en) * | 2016-05-09 | 2016-07-20 | 哈尔滨理工大学 | Method and system for dynamic regulation and control of nodulizing inoculation processing of nodular cast iron |
| CN106127821A (en) * | 2016-07-01 | 2016-11-16 | 昆明理工大学 | A kind of method based on form factor quantitative Analysis spheroidal graphite cast-iron Oxygen potential |
| CN106596727A (en) * | 2016-12-23 | 2017-04-26 | 江苏钜源机械有限公司 | Casting spheroidizing rate nondestructive testing method in evaporative pattern casting negative pressure casting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60174948A (en) * | 1984-02-21 | 1985-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Deterioration diagnosing apparatus for tube |
| JPH08233786A (en) * | 1995-02-23 | 1996-09-13 | Totsuka Denshi Keisoku Kenkyusho:Kk | Method and apparatus for inspecting surface layer of metallic body based on propagation time of ultrasonic wave |
| CN2587550Y (en) * | 2002-11-29 | 2003-11-26 | 东风汽车公司 | Instrument for detecting spheroidization rate of casting piece |
| CN101187650A (en) * | 2006-01-12 | 2008-05-28 | 大连理工大学 | Eccentric ball iron pipe nodularity and wall thickness supersonic damage-free detection method |
| CN102116763A (en) * | 2009-12-30 | 2011-07-06 | 中国第一汽车集团公司 | Ultrasonic sound velocity measurement for determining nodularity of nodular iron casting body |
| CN102607479A (en) * | 2012-02-29 | 2012-07-25 | 大连理工大学 | Method for measuring round-trip time of ultrasound in thin layered medium based on sound pressure reflection coefficient power spectrum |
-
2013
- 2013-08-30 CN CN2013103899895A patent/CN103412050A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60174948A (en) * | 1984-02-21 | 1985-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Deterioration diagnosing apparatus for tube |
| JPH08233786A (en) * | 1995-02-23 | 1996-09-13 | Totsuka Denshi Keisoku Kenkyusho:Kk | Method and apparatus for inspecting surface layer of metallic body based on propagation time of ultrasonic wave |
| CN2587550Y (en) * | 2002-11-29 | 2003-11-26 | 东风汽车公司 | Instrument for detecting spheroidization rate of casting piece |
| CN101187650A (en) * | 2006-01-12 | 2008-05-28 | 大连理工大学 | Eccentric ball iron pipe nodularity and wall thickness supersonic damage-free detection method |
| CN102116763A (en) * | 2009-12-30 | 2011-07-06 | 中国第一汽车集团公司 | Ultrasonic sound velocity measurement for determining nodularity of nodular iron casting body |
| CN102607479A (en) * | 2012-02-29 | 2012-07-25 | 大连理工大学 | Method for measuring round-trip time of ultrasound in thin layered medium based on sound pressure reflection coefficient power spectrum |
Non-Patent Citations (2)
| Title |
|---|
| 孔双庆: "管道超声导波检测的数值模拟和实验研究", 《中国知网优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
| 廖智等: "球墨铸铁球化率超声检测***", 《铸造》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391043A (en) * | 2014-12-10 | 2015-03-04 | 哈尔滨理工大学 | Device for ultrasonically detecting creep ratio of vermicular graphite cast iron with any size and using method of device |
| CN104483386A (en) * | 2014-12-24 | 2015-04-01 | 哈尔滨理工大学 | Device for rapidly predicating carbon saturation degree of gray cast iron and method for acquiring carbon saturation degree of gray cast iron |
| CN105158340A (en) * | 2015-09-18 | 2015-12-16 | 宁夏共享集团股份有限公司 | Detection method for spheroidization rate of ferrite ball-milling cast iron body of gas turbine |
| CN105785882A (en) * | 2016-05-09 | 2016-07-20 | 哈尔滨理工大学 | Method and system for dynamic regulation and control of nodulizing inoculation processing of nodular cast iron |
| CN105785882B (en) * | 2016-05-09 | 2019-05-14 | 哈尔滨理工大学 | A kind of spheroidal graphite cast-iron nodularization inoculation dynamic regulation method and system |
| CN106127821A (en) * | 2016-07-01 | 2016-11-16 | 昆明理工大学 | A kind of method based on form factor quantitative Analysis spheroidal graphite cast-iron Oxygen potential |
| CN106596727A (en) * | 2016-12-23 | 2017-04-26 | 江苏钜源机械有限公司 | Casting spheroidizing rate nondestructive testing method in evaporative pattern casting negative pressure casting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103412050A (en) | Device and acquisition method for ultrasonically measuring spheroidization rate of spheroidal graphite cast iron | |
| CN111307357A (en) | Differential method-based ultrasonic detection method for bolt fastening axial force | |
| CN101975633B (en) | Method for measuring energizing force of engine by continuous refinement analytical Fourier transform method | |
| CN105424502B (en) | Large-deformation pipeline circumferential weld bending tester and method thereof | |
| Kietov et al. | Study of dynamic crack formation in nodular cast iron using the acoustic emission technique | |
| CN105353043A (en) | Sheet metal micro-crack time reversal positioning method based on abaqus | |
| CN103926324B (en) | A kind of ultrasonic surface wave detects the method for live steam piping creep impairment | |
| CN106556363B (en) | Thickness of continuous casting shell online test method and device | |
| CN204758544U (en) | Device of phonophoresis rapid survey magnesium iron balling rate | |
| CN202083674U (en) | Large-scale thermal state casting and forging piece thermal treatment crack on-line detector | |
| CN204214816U (en) | A kind of device utilizing ultrasound examination vermicular cast iron nodulizing rate | |
| CN107024535A (en) | A kind of multiple index depth detection method of the vertical defect based on surface wave | |
| CN102116763B (en) | Ultrasonic sound velocity measurement for determining nodularity of nodular iron casting body | |
| CN105067461A (en) | Method for improving hardness determination accuracy of large metal parts | |
| CN104897779A (en) | Method of measuring ultrasonic wave transmission time by using chirp signals | |
| CN105424798A (en) | Method for actively detecting defects in metal thin-walled structure part | |
| CN103575381B (en) | Based on the measuring method of the sound fields of ultrasonic transducers of dynamic photoelasticity | |
| CN204594644U (en) | The contactless modal test system of a kind of acoustically-driven | |
| CN204101515U (en) | A kind of ultrasonic longitudinal wave detects the device of G. Iron Castings nodulizing grade | |
| CN204255907U (en) | The device of fast prediction Carbon Saturation Degree of Gray Cast Iron | |
| CN107782550A (en) | A kind of stainless steel support checking system | |
| CN204594937U (en) | One utilizes acoustics spectrum analysis to identify the successional device of special-shaped parts | |
| CN211697525U (en) | Device for measuring influence of local heating on adhesion force | |
| CN104483386A (en) | Device for rapidly predicating carbon saturation degree of gray cast iron and method for acquiring carbon saturation degree of gray cast iron | |
| CN207866291U (en) | A kind of acoustic emission test device for axial workpiece bending crack and fracture detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131127 |