Laser Ultrasonic Detecting Device for Rough Surface Contact State
A contact state, laser ultrasonic technology, applied in measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problems of experimental results influence, uneven force, etc. The effect of simple operation of the device
Inactive Publication Date: 2019-04-16
NANJING UNIV OF SCI & TECH
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Problems solved by technology
In his master thesis "Experimental Research on the Contact Characteristics of Rough Surfaces", Yang Hongfeng of our research group used laser ultrasound to study the contact stress of rough surfaces, which theoretically confirmed the feasibility of laser ultrasound for the research of contact stress on rough surfaces. Only two bolts are used for pre-tightening, which is limited to using a torque wrench as a force application method, which is likely to cause uneven force, which will have a certain impact on the experimental results
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Embodiment 1
[0034] The first test block 6 and the second test block 7 are both cuboid structures, the material is 45 steel, and the shape and position tolerance of grade 5 and the accuracy grade of grade 6 are required, and the length of the first test block 6 and the second test block 7 is × width The x thickness is 90mm x 20mm x 5mm, and the roughness requires four grades: 0.8μm, 1.6μm, 3.2μm, 6.3μm, and the focal length of the convex lens 13 is 50mm as an example.
[0035] combine Figure 1 to Figure 6 , a kind of laser ultrasonic detection device of rough surface contact state, comprises pressurization system, first probe 11, second probe 12, convex lens 13, pulse laser 14, optical platform 15 and oscilloscope 16; Described pressurization system comprises test block Support plate 1, top plate 2, oil cylinder support plate 3, bottom plate 4, fixture 5, first test block 6, second test block 7, pressure plate 8, oil cylinder 9 and hydraulic pump 10. The pulsed laser 14 , the convex lens...
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Abstract
The invention discloses a laser ultrasonic detection device for a contact state of a rough surface. A test block supporting plate and an oil cylinder supporting plate are arranged in parallel; the tops of the test block supporting plate and the oil cylinder supporting plate are fixedly connected with a top plate respectively, and the bottoms of the test block supporting plate and the oil cylinder supporting plate are fixedly connected with a base plate respectively; a clamp and an oil cylinder are arranged between the test block supporting plate and the oil cylinder supporting plate; the clamp is fixedly connected with the test block supporting plate; the oil cylinder is fixedly connected with the oil cylinder supporting plate; a first probe is arranged on a first test block, and is connected with an oscillograph; a second probe is arranged on a second test block, and is connected with the oscillograph; the oil cylinder is connected with a hydraulic pump through an oil pipe; a pressing plate, the second test block to be detected and the first test block are fixed through the clamp in sequence. According to the laser ultrasonic detection device for the contact state of the rough surface, a pressurization system is used for applying a load to the test block to be tested, so that continuous application of prepressure on the contact surface of the experimented test block can be guaranteed according to a pressure value.
Description
technical field [0001] The invention relates to the field of testing the rough surface contact state, in particular to a laser ultrasonic detection device for the rough surface contact state. Background technique [0002] Precision instruments and precision machinery are assembled from parts according to certain technical requirements, and the parts must form a contact surface, that is, a rough joint surface. The rough joint surface itself has a certain geometric shape error and microscopic unevenness. When it is subjected to a dynamic load, a small displacement with macro-microscopic characteristics will occur between the joint surfaces. This dynamic characteristic of the rough joint surface will affect precision instruments and precision. The dynamic characteristics of the machine have a great influence. To study the dynamic characteristics of the rough joint surface, the real contact state of the two rough surfaces must be considered. Surface profilometer, electron micr...
Claims
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IPC IPC(8): G01N3/10G01N3/06
CPCG01N3/06G01N3/10G01N2203/0019G01N2203/0048G01N2203/0658G01N2203/0682
Inventor 杨元元
Owner NANJING UNIV OF SCI & TECH