CN102435518A - High-frequency fretting wear tester - Google Patents

High-frequency fretting wear tester Download PDF

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Publication number
CN102435518A
CN102435518A CN2011102799602A CN201110279960A CN102435518A CN 102435518 A CN102435518 A CN 102435518A CN 2011102799602 A CN2011102799602 A CN 2011102799602A CN 201110279960 A CN201110279960 A CN 201110279960A CN 102435518 A CN102435518 A CN 102435518A
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CN
China
Prior art keywords
signal
sample
frequency
tested sample
vibration
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Application number
CN2011102799602A
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Chinese (zh)
Inventor
任万滨
马松君
王鹏
马晓明
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哈尔滨工业大学
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Priority to CN2011102799602A priority Critical patent/CN102435518A/en
Publication of CN102435518A publication Critical patent/CN102435518A/en

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Abstract

The invention which relates to the technical field of test and concretely relates to the technical field of wear test provides a high-frequency fretting wear tester. According to the tester, an electric vibration table is adopted to provide the fretting needed by the fretting wear test, the vibration table surface of the electric vibration table is fixedly connected with a fretting clamping mechanism for clamping a first test sample to realize the fretting, a precompaction structure is adopted to provide precompaction force for the first test sample, and a pressure sensor is adopted to measure the precompaction force; a wear mechanism is fixedly connected with the table body of the electric vibration table to provide a wear structure which can generate friction with test samples, the upper end surface of a second test sample on the wear mechanism tightly contact the lower end surface of the first test sample, and a frictional force sensor is adopted to measure the frictional force born by the second test sample; a laser displacement sensor is adopted to measure the displacement of the first test sample; and a signal conditioning and acquiring circuit acquires pressure signals and frictional force signals and measures output signals of four electrodes of above two test samples.

Description

High frequency fretting wear proving installation
Technical field
The present invention relates to technical field of measurement and test, be specifically related to the wear testing technical field.
Background technology
Electric connector is subject to the influence of external environment and condition of work; Mechanical vibration act on the contact pin jack position in it through the structure member in the electric connector; Cause the contact site friction and relative displacement takes place, the contact fretting wear that is caused, fretting corrosion, fretting fatigue phenomenon will cause electrical contact performance to be degenerated gradually even disabler.Therefore the requirement that automobile is used, space flight is used, electronic equipment all need satisfy reliably working under mechanical environment with products such as electric connectors.
Fretting wear is meant that two solid contact interfaces by structural vibration or alterante stress effect the periodically caused wear phenomenon of small amplitude relative motion take place down.
Fretting wear is a kind of typical combined type wearing and tearing, can cause contact material elastic-plastic deformation so that mechanical wear.Wearing and tearing directly occur on the slider material surface, possibly cause that part is loosening, power attenuation and noise increase; Produce micro-crack in indirect made material surface or the sub-surface layer, under alternate stress, develop into fatigue break.Crackle that it is left and expansion trend thereof will be brought bigger harmfulness.
Therefore, be very necessary for the fretting wear performance detection of the electric connecting part of electric connector and to state of wear to the research of the influence of electric property.And in some extreme environments such as Aero-Space; Electric connector need bear long dither; This dither causes that wearing and tearing are one of the main reasons that Aero-Space lost efficacy with electric connector; So need a such proving installation; Can analyze each item mechanical characteristic of under high frequency fine motion situation electric connector electric connecting part wearing and tearing and, help to analyze electric connector fretting wear failure mechanism, and theoretical foundation is provided for the optimal design of electric connector such as the electrical specification of contact resistance.
Summary of the invention
The present invention is directed to the electric connecting part of electric connector, designed a kind of high frequency fretting wear proving installation.
High frequency fretting wear proving installation of the present invention is characterized in that this proving installation comprises electric vibration table, fine motion clamping physical construction, wearing and tearing physical construction, laser displacement sensor 10 and signal condition and Acquisition Circuit,
Electric vibration table is used to provide the testing jiggle wearing and tearing required micro breadth oscillation, and said micro breadth oscillation is meant that amplitude is micron order, frequency less than 2000Hz and greater than the sinusoidal vibration of 10Hz;
Be fixedly connected with fine motion clamping physical construction on the vibration table 12 of electric vibration table; Said fine motion clamping physical construction is used for clamping first tested sample 8 and realizes micro breadth oscillation; Comprise precompression structure and pressure transducer 5 in this fine motion clamping physical construction; Said precompression structure is used for pre-pressing force to first tested sample 8 being provided, and said pressure transducer 5 is used to measure this pre-pressing force;
Wearing and tearing physical construction is fixedly connected with the stage body of electric vibration table; Be used to provide the wearing and tearing structure that produces friction with tested sample; The upper surface of second tested sample 9 of the said mechanism of wearing and tearing closely contacts with the lower surface of first tested sample 8; The in-house friction force sensor 3 that also is provided with of said wearing and tearing, said friction force sensor 3 is used to measure the friction force that second tested sample 9 is born;
Laser displacement sensor 10 is fixedly connected with wearing and tearing physical construction, is used to measure the displacement of first tested sample 8;
Pressure transducer 5 output pressure signals are given signal condition and Acquisition Circuit, and friction force sensor 3 output friction force signals are given signal condition and Acquisition Circuit;
First tested sample 8 is drawn two electrodes; Second tested sample 9 is drawn two electrodes; Four signals collecting ends of said four electrodes and signal condition and Acquisition Circuit are connected, and said four electrodes are four electrodes that are used for measuring the four-wire system method of two contact resistances between the tested sample.
In this embodiment, first tested sample 8 can contact with sphere with plane contact, ball plane contact or sphere for the plane with the surface of contact of second tested sample 9.
High frequency fretting wear detecting and analysing system of the present invention and method can detect the fretting wear situation of electric connecting part; Comprise the situation of change that detects contact friction force, pressure in the wear process; The contact resistance situation of change, relative displacement situation etc. between two contacts.This device is the electric signal of detecting sensor signal and contact position in real time; And be suitable for the analysis of fretting wear under the dither condition; Can be used for electric connector electric connecting part fretting wear performance detection, also can be used for the analysis of electric connector contact material fretting wear characteristic.
Description of drawings
Fig. 1 is the structural representation of high frequency fretting wear proving installation of the present invention.Fig. 2 is the left view of Fig. 1, and Fig. 3 is the vertical view of Fig. 1.
Embodiment
Embodiment one: the described high frequency fretting wear of this embodiment proving installation comprises electric vibration table, fine motion clamping physical construction, wearing and tearing physical construction, laser displacement sensor 10 and signal condition and Acquisition Circuit,
Electric vibration table is used to provide the testing jiggle wearing and tearing required micro breadth oscillation, and said micro breadth oscillation is meant that amplitude is the sinusoidal vibration less than 2000Hz of micron order, frequency;
Be fixedly connected with fine motion clamping physical construction on the vibration table 12 of electric vibration table; Said fine motion clamping physical construction is used for clamping first tested sample 8 and realizes micro breadth oscillation; Comprise precompression structure and pressure transducer 5 in this fine motion clamping physical construction; Said precompression structure is used for pre-pressing force to first tested sample 8 being provided, and said pressure transducer 5 is used to measure this pre-pressing force;
Wearing and tearing physical construction is fixedly connected with the stage body of electric vibration table; Be used to provide the wearing and tearing structure that produces friction with tested sample; The upper surface of second tested sample 9 of the said mechanism of wearing and tearing closely contacts with the lower surface of first tested sample 8; The in-house friction force sensor 3 that also is provided with of said wearing and tearing, said friction force sensor 3 is used to measure the friction force that second tested sample 9 is born;
Laser displacement sensor 10 is fixedly connected with wearing and tearing physical construction, is used to measure the displacement of first tested sample 8;
Pressure transducer 5 output pressure signals are given signal condition and Acquisition Circuit, and friction force sensor 3 output friction force signals are given signal condition and Acquisition Circuit;
First tested sample 8 is drawn two electrodes; Second tested sample 9 is drawn two electrodes; Four signals collecting ends of said four electrodes and signal condition and Acquisition Circuit are connected, and said four electrodes are four electrodes that are used for measuring the four-wire system method of two contact resistances between the tested sample.
In this embodiment, first tested sample 8 can contact with sphere with plane contact, ball plane contact or sphere for the plane with the surface of contact of second tested sample 9.
Pressure transducer 5 in this embodiment can be selected the CLBSF sensor of Bengbu Kechuang Sensitive Object, range 20N for use.
Friction force sensor 3 in this embodiment can be selected the 209C11 dynamic force sensor of U.S. PCB company for use, range-4.45N (drawing)~9.79N (pressure), frequency response upper limit 30kHz.
Laser displacement sensor 10 in this embodiment can be selected the ILD 2220 of MICRO-EPSILON company for use.Resolution 0.03 μ m, survey frequency 20kHz
The described high frequency fretting wear of this embodiment proving installation is used to do the fretting wear situation between a pair of tested sample; This device can be in test process; At any time obtain pressure parameter information, friction force parameter information and contact resistance parameter information between a pair of tested sample; According to the parameter information of these acquisitions, can be to tested sample in friction force situation over time in the monocycle; Can also extract interior folk prescription of monocycle as required to the friction force maximal value, and analyze the situation of change of friction force in whole wear process; Can also obtain the situation of change of pressure in the wearing and tearing process; The situation of contact resistance in the time of can also obtaining particular point in time; Can also obtain relation between the variation of variation and contact resistance of friction force or the like.
Embodiment two: this embodiment is the further qualification to the fine motion clamping physical construction structure in the embodiment one described high frequency fretting wear proving installation; Fine motion clamping physical construction described in this embodiment also comprises back up pad 1, sensor support frame 4; One end of said back up pad 1 is fixedly connected with the vibration table 12 of electric vibration table; The other end of said back up pad 1 is away from the vibration table 12 of said electric vibration table, and is fixedly connected with the precompression structure, and said precompression structure comprises sample slide block 7, sample holder structure, spring and jackscrew 6; The other end of back up pad 1 is fixedly connected with sample slide block 7; The bottom of sensor support frame 4 is fixed on this sample slide block 7, the through hole vertically of said sample slide block 7, pressure transducer 5 be positioned at this through hole directly over and the one of which end regulate bolt 14 through pressure and be fixedly connected with sensor support frame 4; The other end of this pressure transducer 5 is fixedly connected with an end of jackscrew 6; The other end of said jackscrew 6 embeds in the through hole of sample slide block 7, and closely contacts with an end of the spring that is positioned at this through hole, and the other end of this spring closely contacts with the top of sample holder structure; The bottom of this sample holder structure is a bare terminal end; This bare terminal end is positioned at the outside of the through hole of sample slide block 7, and is fixedly connected with first tested sample 8, and said sample holder structure, spring and jackscrew 6 can slide up and down in the through hole of sample slide block 7.
The described fine motion clamping of this embodiment physical construction is fixedly connected with the vibration table 12 of electric vibration table; Realize synchronous vibration with said vibration table 10; That is: under the drive of said vibration table 10, it is the sinusoidal vibration less than 2000Hz of micron order, frequency that first tested sample is done amplitude.
Precompression structure in the described fine motion clamping of this embodiment physical construction adopts spring and spring strut to realize the pressure that first tested sample 8 receives.
In this embodiment; The pressure that is positioned on the sensor stand 4 is regulated bolt 14; Be used to regulate the pressure between first tested sample 8 and second tested sample 9, in the time of can regulating each measurement according to the performance of tested sample and test needs, the pressure size between two tested sample.
Embodiment three: this embodiment is the further qualification to the wearing and tearing physical construction in the embodiment one described high frequency fretting wear proving installation; Wearing and tearing physical construction in this embodiment also comprises support corner fittings 2, specimen holder, corner fittings back-up block 11 and wearing and tearing mechanism back up pad 13; Said bottom of wearing and tearing mechanism's back up pad 13 is fixedly connected with the stage body of electric vibration table; Said top of wearing and tearing mechanism's back up pad 13 is fixedly connected with the bottom of corner fittings back-up block 11; The top of said corner fittings back-up block 11 is fixedly connected with supporting corner fittings 2, and the mounting plane of said support corner fittings 2 and the vibration table of electric vibration table 12 parallel, and are fixed with laser displacement sensor 10 and specimen holder on the said support corner fittings 2; One end of said specimen holder is the sample holder end; Be used for fixing second tested sample 9, the other end of said specimen holder is fixedly connected with friction force sensor 3 fixing ends, and the other end of this friction force sensor 3 is fixedly connected with support corner fittings 2.
The described wearing and tearing physical construction of this embodiment is fixedly connected with the stage body of electric vibration table through wearing and tearing mechanism back up pad 13; Make whole wearing and tearing mechanism in test process, be always stationary state; Promptly in test process, produce relative motions with the vibration table of electric vibration table 12; And then make that being fixed on structural second tested sample 9 of this wearing and tearing machinery produces relative motion with first tested sample 8 that is fixed on the fine motion clamping physical construction; That is: produce little fricting movement that shakes, the analog electrical connector is the contact pin jack situation of friction relatively in application process.Be fixed on this mechanical structural laser displacement sensor 10 that weares and teares and be used to measure the displacement information that is positioned at first tested sample 8 on the fine motion clamping physical construction, and then obtain the relative displacement information between first tested sample 8 and second tested sample 9.
Embodiment four: this embodiment is further specifying signal condition in the embodiment one described high frequency fretting wear proving installation and Acquisition Circuit; Said signal condition of signal condition in this embodiment and Acquisition Circuit and Acquisition Circuit comprise signal conditioning circuit, A/D change-over circuit; Said signal conditioning circuit receives the friction force signal of friction force sensor 3 transmissions, also this friction force signal amplification is sent to the A/D change-over circuit afterwards; Said signal conditioning circuit also receives the pressure signal of pressure transducer 5 transmissions, also this pressure signal amplification is sent to the A/D change-over circuit afterwards; Said signal conditioning circuit also receives four electric signal that electrode is drawn of two tested sample; And amplification obtains voltage signal and current signal sends to the A/D change-over circuit, and said A/D change-over circuit converts the signal that receives to digital signal output respectively.
Embodiment five: this embodiment is further specifying embodiment four described high frequency fretting wear proving installations; High frequency fretting wear proving installation described in this embodiment also comprises data processor, and said data processor is used to receive the displacement signal that laser displacement sensor 10 sends; Said data processor is used for the signal of the A/D change-over circuit output of receiving signal reason and Acquisition Circuit, and obtains pressure, friction force, contact resistance and touch voltage between two tested sample according to all calculated signals that receive.
This embodiment has increased draws together data processor, and this data processor is used for the data that processing and detecting obtains, and obtains relevant parameters according to the data computation that obtains.
Can also increase display in this embodiment, said display is connected with data processor, is used for showing outputing test data or result of calculation parameter etc.
Data processor in this embodiment can adopt computer realization.
Embodiment six: this embodiment is that the signal condition in the embodiment five described high frequency fretting wear proving installations and the signal condition and the Acquisition Circuit that further specify in this embodiment of Acquisition Circuit are also comprised serial communication circuit, and this serial communication circuit is used for adopting the mode of serial communication to send to data processor the digital signal of the signal output of A/D change-over circuit output.

Claims (10)

1. high frequency fretting wear proving installation is characterized in that this proving installation comprises electric vibration table, fine motion clamping physical construction, wearing and tearing physical construction, laser displacement sensor (10) and signal condition and Acquisition Circuit,
Electric vibration table is used to provide the testing jiggle wearing and tearing required micro breadth oscillation, and said micro breadth oscillation is meant that amplitude is micron order, frequency less than 2000Hz and greater than the sinusoidal vibration of 10Hz;
Be fixedly connected with fine motion clamping physical construction on the vibration table of electric vibration table (12); Said fine motion clamping physical construction is used for clamping first tested sample (8) and realizes micro breadth oscillation; Comprise precompression structure and pressure transducer (5) in this fine motion clamping physical construction; Said precompression structure is used for pre-pressing force to first tested sample (8) being provided, and said pressure transducer (5) is used to measure this pre-pressing force;
Wearing and tearing physical construction is fixedly connected with the stage body of electric vibration table; Be used to provide the wearing and tearing structure that produces friction with tested sample; The upper surface of second tested sample (9) of the said mechanism of wearing and tearing closely contacts with the lower surface of first tested sample (8); The in-house friction force sensor (3) that also is provided with of said wearing and tearing, said friction force sensor (3) is used to measure the friction force that second tested sample (9) is born;
Laser displacement sensor (10) is fixedly connected with wearing and tearing physical construction, is used to measure the displacement of first tested sample (8);
Pressure transducer (5) output pressure signal is given signal condition and Acquisition Circuit, and friction force sensor (3) output friction force signal is given signal condition and Acquisition Circuit;
First tested sample (8) is drawn two electrodes; Second tested sample (9) is drawn two electrodes; Four signals collecting ends of said four electrodes and signal condition and Acquisition Circuit are connected, and said four electrodes are four electrodes that are used for measuring the four-wire system method of two contact resistances between the tested sample.
2. high frequency fretting wear proving installation according to claim 1 is characterized in that, said first tested sample is done amplitude under the drive of said vibration table (12) be the sinusoidal vibration less than 2000Hz of micron order, frequency.
3. high frequency fretting wear proving installation according to claim 1 is characterized in that, said friction force sensor (3) adopts the dynamic force sensor, and its range is: pulling force 4.45N~pressure 9.79N, frequency response upper limit 30kHz.
4. high frequency fretting wear proving installation according to claim 1 is characterized in that, the resolution 0.03 μ m of said laser displacement sensor (10), survey frequency 20kHz.
5. high frequency fretting wear proving installation according to claim 1; It is characterized in that; Described fine motion clamping physical construction also comprises back up pad (1), sensor support frame (4), and an end of said back up pad (1) is fixedly connected with the vibration table (12) of electric vibration table, and the other end of said back up pad (1) is away from the vibration table (12) of said electric vibration table; And be fixedly connected with the precompression structure; Said precompression structure comprises sample slide block (7), sample holder structure, spring and jackscrew (6), and the other end of back up pad (1) is fixedly connected with sample slide block (7), and the bottom of sensor support frame (4) is fixed on this sample slide block (7); The through hole vertically of said sample slide block (7); Pressure transducer (5) be positioned at this through hole directly over and the one of which end regulate bolt (14) through pressure and be fixedly connected with sensor support frame (4), the other end of this pressure transducer (5) is fixedly connected with an end of jackscrew (6), in the through hole of the other end embedding sample slide block (7) of said jackscrew (6); And closely contact with an end of the spring that is positioned at this through hole; The other end of this spring closely contacts with the top of sample holder structure, and the bottom of this sample holder structure is a bare terminal end, and this bare terminal end is positioned at the outside of the through hole of sample slide block (7); And be fixedly connected with first tested sample (8), said sample holder structure, spring and jackscrew (6) can slide up and down in the through hole of sample slide block (7).
6. high frequency fretting wear proving installation according to claim 5 is characterized in that, said pressure is regulated bolt (14) and is used to regulate the pressure between first tested sample (8) and second tested sample (9).
7. high frequency fretting wear proving installation according to claim 1; It is characterized in that; Said wearing and tearing physical construction also comprises support corner fittings (2), specimen holder, corner fittings back-up block (11) and wearing and tearing mechanism's back up pad (13); The bottom of said wearing and tearing mechanism's back up pads (13) is fixedly connected with the stage body of electric vibration table, and the top of said wearing and tearing mechanism's back up pads (13) is fixedly connected with the bottom of corner fittings back-up block (11), and the top of said corner fittings back-up block (11) is fixedly connected with support corner fittings (2); The vibration table (12) of the mounting plane of said support corner fittings (2) and electric vibration table parallels; Be fixed with laser displacement sensor (10) and specimen holder on the said support corner fittings (2), an end of said specimen holder is the sample holder end, is used for fixing second tested sample (9); The other end of said specimen holder is fixedly connected with the fixing end of friction force sensor (3), and the other end of this friction force sensor (3) is fixedly connected with support corner fittings 12.
8. high frequency fretting wear proving installation according to claim 1; It is characterized in that; Said signal condition and Acquisition Circuit comprise signal conditioning circuit, A/D change-over circuit; Said signal conditioning circuit receives the friction force signal of friction force sensor (3) transmission, also this friction force signal amplification is sent to the A/D change-over circuit afterwards; Said signal conditioning circuit also receives the pressure signal of pressure transducer (5) transmission, also this pressure signal amplification is sent to the A/D change-over circuit afterwards; Said signal conditioning circuit also receives four electric signal that electrode is drawn of two tested sample, and amplification obtains voltage signal and current signal sends to the A/D change-over circuit, and said A/D change-over circuit converts the signal that receives to digital signal output respectively.
9. high frequency fretting wear proving installation according to claim 8, it also comprises data processor, said data processor is used to receive the displacement signal that laser displacement sensor (10) sends; Said data processor is used for the signal of the A/D change-over circuit output of receiving signal reason and Acquisition Circuit, and obtains pressure, friction force, contact resistance and touch voltage between two test specimens according to all calculated signals that receive.
10. high frequency fretting wear proving installation according to claim 9; It is characterized in that; Said signal condition and Acquisition Circuit also comprise serial communication circuit, and this serial communication circuit is used for adopting the mode of serial communication to send to data processor the digital signal of the signal output of A/D change-over circuit output.
CN2011102799602A 2011-09-21 2011-09-21 High-frequency fretting wear tester CN102435518A (en)

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CN103192293A (en) * 2013-03-17 2013-07-10 苏州科技学院 Method for measuring vibration performance of tool nose of micro-milling tool
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CN105181481A (en) * 2015-10-14 2015-12-23 哈尔滨工程大学 Three-point bending fatigue testing machine
CN109406323A (en) * 2018-10-22 2019-03-01 叶文娣 A kind of cloth anti-pilling property test board
CN109883672A (en) * 2019-03-06 2019-06-14 哈尔滨工业大学 A kind of experimental rig and method of the interior contact parts depreciation degeneration of test electric connector

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102706800A (en) * 2012-05-22 2012-10-03 中国科学院宁波材料技术与工程研究所 Multifunctional micro-tribology test machine and method for evaluating friction or adhesiveness of materials by using same
CN102706800B (en) * 2012-05-22 2014-02-19 中国科学院宁波材料技术与工程研究所 Multifunctional micro-tribology test machine and method for evaluating friction or adhesiveness of materials by using same
CN103192293A (en) * 2013-03-17 2013-07-10 苏州科技学院 Method for measuring vibration performance of tool nose of micro-milling tool
CN103604715A (en) * 2013-11-25 2014-02-26 哈尔滨工业大学 Compound stress environment testing system of contact point material
CN103604715B (en) * 2013-11-25 2016-02-03 哈尔滨工业大学 Slider material synthesized stress environment experimental system
CN104020038A (en) * 2014-06-17 2014-09-03 山东大学 Combinatorial testing accessory of vibration testing platform and static fatigue testing method
CN104020038B (en) * 2014-06-17 2016-05-25 山东大学 A kind of vibration mechine combined test annex and static fatigue test method
CN105181481A (en) * 2015-10-14 2015-12-23 哈尔滨工程大学 Three-point bending fatigue testing machine
CN109406323A (en) * 2018-10-22 2019-03-01 叶文娣 A kind of cloth anti-pilling property test board
CN109406323B (en) * 2018-10-22 2020-12-11 江西祥力纺织有限公司 Anti balling-up capability test board of cloth
CN109883672A (en) * 2019-03-06 2019-06-14 哈尔滨工业大学 A kind of experimental rig and method of the interior contact parts depreciation degeneration of test electric connector

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Application publication date: 20120502