CN106289983B - The laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state - Google Patents
The laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state Download PDFInfo
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- CN106289983B CN106289983B CN201610609431.7A CN201610609431A CN106289983B CN 106289983 B CN106289983 B CN 106289983B CN 201610609431 A CN201610609431 A CN 201610609431A CN 106289983 B CN106289983 B CN 106289983B
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- test block
- oil cylinder
- support plate
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- plate
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
-
- 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
-
- 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
- G01N2203/0019—Compressive
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- 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
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
-
- 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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state, test block support plate and oil cylinder support plate are arranged in parallel, and are connected respectively with top plate at the top of test block support plate and oil cylinder support plate, bottom is connected with bottom plate respectively；Fixture and oil cylinder are arranged between test block support plate and oil cylinder support plate, and wherein fixture and test block support plate are connected, and oil cylinder and oil cylinder support plate are connected；First probe is arranged in the first test block, and the first probe is connect with oscillograph, and the second probe is arranged in the second test block, and the second probe is connect with oscillograph；Oil cylinder is connect by oil pipe with hydraulic pump；Pressing plate, the second test block to be measured and the first test block pass sequentially through fixture and fix.The present invention applies load to experiment test block to be measured using compression system, it is ensured that experiment test block contact surface precompression continuously applying in pressure value.
Description
Technical field
The present invention relates to the testing fields of Studies On Contacts of Rough Surfaces state, and in particular to a kind of Studies On Contacts of Rough Surfaces state swashs
Light ultrasonic sensor.
Background technique
Precision instrument and precision machinery are to be assembled by components according to certain technical requirements, inevitable between components
Form the surface to contact with each other, i.e., coarse faying face.There are certain errors in geometrical form and microcosmic for coarse faying face itself
Unevenness can be generated when by dynamic load effect, between faying face with macroscopic view-microscopic characteristics micro-displacement, coarse combination
This dynamic characteristic in face will produce a very large impact the dynamic characteristic of precision instrument and precision machinery.It is dynamic to study coarse faying face
Step response, it is necessary to consider two rough surface actual contact states.Using the side such as surface profiler, electron microscope and digital hologram
Method can detect rough surface microscopic appearance, but for rough surface in contact approach procedure the microcosmic degree of contact portion
There is presently no generally acknowledged methods for research.
In order to detect rough surface actual contact state, propose to use laser-ultrasound detection Studies On Contacts of Rough Surfaces state
Method.This seminar Yang Hongfeng is studied in Master's thesis " experimental study of Studies On Contacts of Rough Surfaces characteristic " using laser-ultrasound
The method of Studies On Contacts of Rough Surfaces stress theoretically confirms laser-ultrasound for the feasible of Studies On Contacts of Rough Surfaces stress studies
Property, contact surface is confined to use torque wrench as reinforcing mode only with two tools for bolts ' pretension modes when experiment, easily cause by
Power is uneven, and certain influence can be generated to experimental result.
Summary of the invention
The purpose of the present invention is to provide a kind of laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state, especially suitable for
Detection is under the effect of different precompressions, the microcosmic combination degree of two rough surfaces contact surface in contact approach procedure.
The technical solution for realizing the aim of the invention is as follows: a kind of laser-ultrasound detection dress of Studies On Contacts of Rough Surfaces state
It sets, including compression system, the first probe, the second probe, convex lens, pulse laser, optical platform and oscillograph；The pressurization
System includes test block support plate, top plate, oil cylinder support plate, bottom plate, fixture, pressing plate, oil cylinder and hydraulic pump.
The pulse laser, convex lens and bottom plate are connected with optical platform respectively；Test block support plate and oil cylinder support plate
It is arranged in parallel, is connected respectively with top plate at the top of test block support plate and oil cylinder support plate, bottom is connected with bottom plate respectively；Fixture and oil
Cylinder is arranged between test block support plate and oil cylinder support plate, and wherein fixture and test block support plate are connected, and oil cylinder and oil cylinder support
Plate is connected；First probe is arranged in the first test block, and the first probe is connect with oscillograph, and the second probe is arranged in the second test block
On, the second probe is connect with oscillograph；Oil cylinder is connect by oil pipe with hydraulic pump；Pressing plate, the second test block to be measured and the first examination
Block passes sequentially through fixture and fixes, and after the piston rod of oil cylinder stretches out oil cylinder, acts on pressing plate center.
The pulse laser, convex lens and the second test block are located at same straight line, the laser warp that pulse laser issues
After convex lens is assembled, it is incident to the second test block.
The convex lens is the focal length of convex lens at a distance from the second test block.
Second test block to be measured and the equal one end of the first test block are located in fixture, and the other end is located at fixture two sides.
The fixture is U-shaped, and bottom and test block support plate are connected, and open end is oppositely arranged with oil cylinder, is equipped in fixture
First groove and the second groove, the first groove is close to clamp base, and the second groove is close to open end, pressing plate, the second examination to be measured
Block and the first test block are successively set in fixture；Second test block and the first test block are protruded into from fixture two sides, the two localized contact,
Contact surface is located at the first groove, and pressing plate is arranged in the second groove, and the contact surface of the second test block and pressing plate is located at the second groove.
The fixture, the first test block, the second test block and pressing plate are required to 5 grades of geometric tolerances and 6 class precision grades.
First test block and the second test block surface roughness Ra are 0.8 μm ~ 6.3 μm.
Compared with prior art, the present invention its remarkable advantage is:
(1) load is applied to experiment test block to be measured using compression system, it, can be with compared with conventionally employed torque wrench pressurizes
Guarantee experiment test block contact surface precompression continuously applying in pressure value.
(2) first test blocks and the second test block contact surface are embedded in the first groove of fixture, the second test block and the insertion of pressing plate contact surface
The second groove of fixture, the first groove avoid the first test block and the second test block contact surface, and the second groove avoids the second test block and pressing plate
Contact surface is easy to happen reflection and has an impact to the accuracy of experimental result when reducing acoustic surface wave propagation.
(3) it first exerts a force on pressing plate, then the first test block and the second test block contact surface is exerted a force to by pressing plate, keep away
Exempt from the surface roughness that experiment test block to be measured is directly hit and influenced in experiment test block to be measured.
(4) first test blocks and the second test block are easily changed, and be suitable for measure different experiment conditions (surface roughness,
Contact area, precompression).
(5) apparatus of the present invention are easy to operate, are easily assembled, and are highly suitable for using laser-ultrasound detection Studies On Contacts of Rough Surfaces
The experimental study of state.
Detailed description of the invention
Fig. 1 is the 3 dimensional drawing of the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state of the present invention.
Fig. 2 is the compression system structure sectional view of the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state of the present invention.
Fig. 3 is the compression system 3 dimensional drawing of the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state of the present invention.
Fig. 4 is that the top board structure in the compression system of the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state of the present invention shows
It is intended to.
Fig. 5 is that the clamp structure in the compression system of the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state of the present invention shows
It is intended to.
Fig. 6 is the surface acoustic wave signal developed using the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state of the present invention
The relationship of intensity and face pressure.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
In conjunction with Fig. 1 to Fig. 4, a kind of laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state, including compression system, first
The 11, second probe 12 of probe, convex lens 13, pulse laser 14, optical platform 15 and oscillograph 16；The compression system includes
Test block support plate 1, top plate 2, oil cylinder support plate 3, bottom plate 4, fixture 5, pressing plate 8, oil cylinder 9 and hydraulic pump 10.
The pulse laser 14, convex lens 13 and bottom plate 4 are connected with optical platform 15 respectively；Test block support plate 1 and oil
Cylinder support plate 3 is arranged in parallel, and test block support plate 1 and the top of oil cylinder support plate 3 are connected with top plate 2 respectively, bottom respectively with bottom plate 4
It is connected；Fixture 5 and oil cylinder 9 are arranged between test block support plate 1 and oil cylinder support plate 3, wherein fixture 5 and test block support plate 1
It is connected, oil cylinder 9 and oil cylinder support plate 3 are connected；First probe 11 and the first test block 6 are connected and connect oscillograph 16 by data line,
Second probe 12 and the second test block 7 are connected and connect oscillograph 16 by data line；Oil cylinder 9 is connected by oil pipe and hydraulic pump 10.
Pressing plate 8, the second test block 7 to be measured and the first test block 6 pass sequentially through fixture 5 and fix, and after the piston rod of oil cylinder 9 stretches out oil cylinder 9, make
Used in 8 center of pressing plate.When applying load, first exert a force on pressing plate 8, then 6 He of the first test block is transferred force to by pressing plate
Second test block, 7 contact surface avoids experiment test block from being directly affected by impact surface roughness and can guarantee uniform force.
The pulse laser 14, convex lens 13 and the second test block 7 are located at same straight line, what pulse laser 14 issued
After laser planoconvex lens 13 are assembled, it is incident to the second test block 7.The convex lens 13 is convex lens 13 at a distance from the second test block 7
Focal length.
Second test block 7 to be measured and 6 one end of the first test block are located in fixture 5, and the other end is located at 5 liang of fixture
Side.
In conjunction with Fig. 5, the fixture 5 is U-shaped, and bottom and test block support plate 1 are connected, and open end is oppositely arranged with oil cylinder 9,
Be equipped with the first groove and the second groove in fixture 5, the first groove close to 5 bottom of fixture, the second groove close to open end, pressing plate 8,
Second test block 7 to be measured and the first test block 6 are successively set in fixture 5；Second test block 7 and the first test block 6 are stretched from 5 two sides of fixture
Entering, the two localized contact, contact surface (i.e. coarse faying face) is located at the first groove, and pressing plate 8 is arranged in the second groove, and the
The contact surface of two test blocks 7 and pressing plate 8 is located at the second groove.The designing of first groove successfully avoids test block 1 and test block 27
Contact surface, the design of the second groove successfully avoid the contact surface of the second test block 7 and pressing plate 8.Reduce acoustic surface wave propagation
When be easy to happen reflection and the accuracy of experimental result is had an impact.
The fixture 5, the first test block 6 and the second test block 7 are required to 5 grades of geometric tolerances and 6 class precision grades.
First test block 6 and 7 surface roughness Ra of the second test block are 0.8 μm ~ 6.3 μm.
Embodiment 1
It is rectangular parallelepiped structure with the first test block 6 and the second test block 7, material is four or five steel, it is desirable that 5 grades of geometric tolerances and 6
Class precision grade, and the first test block 6 and 7 length × width x thickness of the second test block are 90mm × 20mm × 5mm, roughness requirements four
Grade: 0.8 μm, 1.6 μm, 3.2 μm, 6.3 μm, for 13 focal length of convex lens is 50mm.
In conjunction with Fig. 1 to Fig. 6, a kind of laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state, including compression system, first
The 11, second probe 12 of probe, convex lens 13, pulse laser 14, optical platform 15 and oscillograph 16；The compression system includes
Test block support plate 1, top plate 2, oil cylinder support plate 3, bottom plate 4, fixture 5, the first test block 6, the second test block 7, pressing plate 8, oil cylinder 9 and liquid
Press pump 10.The pulse laser 14, convex lens 13 and bottom plate 4 are connected with optical platform 15 respectively.
Bottom plate 4 is rectangular parallelepiped structure, and 4 bottom of bottom plate is equipped with 14 installation through-holes, passes through screw and the fixed chain of optical platform
It connects, top is opened there are two symmetrical rectangular recess, and two waist type countersunk head through-holes are had in two rectangular recess, are used for
It is fixedly connected with test block support plate 1 and oil cylinder support plate 3.
Test block support plate 1 is rectangular parallelepiped structure, respectively opens two threaded holes, test block in the top and bottom of test block support plate 1
1 bottom of support plate is embedded in the rectangular recess in 4 left side of bottom plate, and is connected by screw and test block support plate 1.Test block support plate 1
Side wall is provided with 4 through-holes for stationary fixture 5.
In conjunction with Fig. 4, top plate 2 is rectangular parallelepiped structure, and two symmetrical rectangular recess are opened in bottom surface, in two rectangular recess
Two waist type countersunk head through-holes are had, at the top of test block support plate 1 in the rectangular recess in 2 left side of insertion top plate, and pass through screw
It is connected with top plate 2.
Oil cylinder support plate 3 is rectangular parallelepiped structure, respectively opens two threaded holes, oil cylinder in the bottom and top of oil cylinder support plate 3
3 bottom of support plate is embedded in the rectangular recess on 4 right side of bottom plate, and is connected by screw and oil cylinder support plate 3.Oil cylinder support plate 3
Top is embedded in the rectangular recess on 2 right side of top plate, and is connected by screw and oil cylinder support plate 3.3 side wall of oil cylinder support plate opens 4
A through-hole, for being fixedly connected with oil cylinder 9.
In conjunction with Fig. 5, fixture 5 is U-shaped, and bottom and test block support plate 1 are connected, and open end is oppositely arranged with oil cylinder 9, fixture
It is equipped with the first groove and the second groove in 5, for the first groove close to 5 bottom of fixture, the second groove is pressing plate 8, to be measured close to open end
The second test block 7 and the first test block 6 be successively set in fixture 5；Second test block 7 and the first test block 6 are protruded into from 5 two sides of fixture,
The two localized contact, contact surface are located at the first groove, and pressing plate 8 is arranged in the second groove, and the second test block 7 and pressing plate 8
Contact surface is located at the second groove.
Second test block 7 to be measured and 6 one end of the first test block are located in fixture 5, and the other end is located at 5 liang of fixture
Side.According to the position of the adjustment of contact area size the first test block 6 and the second test block 7 needed for testing.First probe, 11 setting is the
In one test block 6, the first probe 11 connect with oscillograph 16,12 settings of the second probe in the second test block 7, second pop one's head in 12 with show
Wave device 16 connects.
Pressing plate 8 is rectangular parallelepiped structure, it is desirable that 5 grades of geometric tolerances and 6 class precision grades, pressing plate 8 are embedded into folder according to tolerance
In second groove of tool 5,1mm activity space is reserved on the right side of the second groove.When oil cylinder 9 applies load, piston rod first applies power
Onto pressing plate 8, then pass through the contact surface that pressing plate 8 transfers force to the first test block 6 and the second test block 7, avoids experiment test block direct
It is affected by impact surface roughness and can guarantee uniform force.
Compression system installation steps are as follows:
Fixture 5 is fixed by screws in test block support plate 1；Oil cylinder 9 is fixed by screws in oil cylinder support plate 3；Oil
Cylinder 9 is fixedly connected with hydraulic pump 10 by oil pipe；Test block support plate 1 and oil cylinder support plate 3 are respectively embedded into the rectangular recess of bottom plate 4
In, and it is screwed connection；Top plate 2 is covered in test block support plate 1 and oil cylinder support plate 3, and is fixedly connected by screw；
Pressing plate 8 is put into the second groove of fixture 5, and the piston rod of center alignment oil cylinder 9；First test block 6 and the second test block 7 are put into folder
Between tool 5 and pressing plate 8, the first test block 6 is adjusted according to requirement of experiment and suitable position is arrived in the second test block 7.
The experiment flow of the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state of the present invention is as follows:
Step 1: the height of adjustment convex lens 13 makes 14 laser output of pulse laser, convex lens 13 and the second test block 7
Center on a horizontal line, and guarantee the second test block 7 apart from 13 center of convex lens be 13 focal length of convex lens.
Step 2: suitable experiment test block (i.e. the first test block 6 and the second examination are chosen according to surface roughness needed for experiment
Block 7), and they are put between fixture 5 and pressing plate 8, according to the contact surface of the first test block 6 of requirement of experiment and the second test block 7
The position of product adjustment the first test block 6 and the second test block 7.
Step 3: the first probe 11 and second is installed on the non-contact face of the first test block 6 and the second test block 7 respectively respectively
Probe 12, and access oscillograph 16.
Step 4: hydraulic system internal pressure being changed by hydraulic pump 10,9 piston rod of oil cylinder is pushed first to pressure is applied to
On pressing plate 8, then the contact surface of the first test block 6 and the second test block 7 transferred force to by pressing plate 8, completed to the first test block 6 and the
The contact surface of two test blocks 7 pressurizes, according to required precompression adjusting solenoid valve.
Step 5: opening pulse laser 14, adjustment 14 output voltage size of pulse laser, single pulse energy and output
The frequency of laser is incident to the second test block 7 after the laser planoconvex lens 13 for issuing pulse laser 14 are assembled.
Step 6: utilizing 16 observation experiment phenomenon of oscillograph, and record relevant experimental data.
Step 7: according to needed for experiment, changing experiment condition (surface roughness, contact area, precompression), so recycle
Step 2 is to step 6.
Step 8: in conjunction with Fig. 6, according to experiment gained, with the increase of experiment test block contact surface face pressure, surface acoustic wave signal
The variation tendency of intensity is first to increase to decline again, reaches maximum at some intermediate face pressure, and the change of surface acoustic wave signal strength
Change trend will not change with the change of excitation energy and other empirical factors.
Claims (3)
1. a kind of laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state, it is characterised in that: including compression system, the first probe
(11), the second probe (12), convex lens (13), pulse laser (14), optical platform (15) and oscillograph (16)；The pressurization
System include test block support plate (1), top plate (2), oil cylinder support plate (3), bottom plate (4), fixture (5), pressing plate (8), oil cylinder (9) and
Hydraulic pump (10)；
The pulse laser (14), convex lens (13) and bottom plate (4) are connected with optical platform (15) respectively；Test block support plate
(1) it is arranged in parallel with oil cylinder support plate (3), is connected respectively with top plate (2) at the top of test block support plate (1) and oil cylinder support plate (3),
Bottom is connected with bottom plate (4) respectively；Fixture (5) and oil cylinder (9) be arranged at test block support plate (1) and oil cylinder support plate (3) it
Between, wherein fixture (5) and test block support plate (1) are connected, and oil cylinder (9) and oil cylinder support plate (3) are connected；First probe (11) setting
On the first test block (6), the first probe (11) is connect with oscillograph (16), and the second probe (12) is arranged on the second test block (7),
Second probe (12) is connect with oscillograph (16)；Oil cylinder (9) is connect by oil pipe with hydraulic pump (10)；Pressing plate (8), to be measured
Two test blocks (7) and the first test block (6) pass sequentially through fixture (5) and fix, and after the piston rod of oil cylinder (9) stretches out oil cylinder (9), act on
Pressing plate (8) center；
The pulse laser (14), convex lens (13) and the second test block (7) are located at same straight line, pulse laser (14) hair
After laser planoconvex lens (13) out are assembled, it is incident to the second test block (7)；
The convex lens (13) is the focal length of convex lens (13) at a distance from the second test block (7)；
Second test block (7) to be measured and the first test block (6) one end are located in fixture (5), and the other end is located at fixture
(5) two sides；
The fixture (5) is U-shaped, and bottom and test block support plate (1) are connected, and open end is oppositely arranged with oil cylinder (9), fixture
(5) the first groove and the second groove are equipped in, the first groove is close to fixture (5) bottom, and the second groove is close to open end, pressing plate
(8), the second test block (7) to be measured and the first test block (6) are successively set in fixture (5)；Second test block (7) and the first test block
(6) it is protruded into from fixture (5) two sides, the two localized contact, contact surface is located at the first groove, and pressing plate (8) is arranged in the second groove
It is interior, and the contact surface of the second test block (7) and pressing plate (8) is located at the second groove.
2. the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state according to claim 1, it is characterised in that: the folder
Tool (5), the first test block (6), the second test block (7) and pressing plate (8) are required to 5 grades of geometric tolerances and 6 class precision grades.
3. the laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state according to claim 1, it is characterised in that: described
One test block (6) and the second test block (7) surface roughness Ra are 0.8 μm ~ 6.3 μm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610609431.7A CN106289983B (en) | 2016-07-28 | 2016-07-28 | The laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state |
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| CN201610609431.7A CN106289983B (en) | 2016-07-28 | 2016-07-28 | The laser-ultrasound detection device of Studies On Contacts of Rough Surfaces state |
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| CN106289983B true CN106289983B (en) | 2019-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108645583A (en) * | 2018-05-16 | 2018-10-12 | 西安交通大学 | One kind being fitted to each other face normal direction contact damping high-precision detection device and method |
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| CN106289983A (en) | 2017-01-04 |
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