System and method for measuring surface roughness in online manner on basis of laser light scattering processes

A technology of surface roughness and laser scattering method, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of opacity and limited optical methods, and achieve the effects of avoiding secondary damage, good prospects and high resolution

Inactive Publication Date: 2018-05-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The environment of the processing site is very complicated. For example, the opacity of the coolant used in the processing limits the application of optical methods.

Method used

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  • System and method for measuring surface roughness in online manner on basis of laser light scattering processes
  • System and method for measuring surface roughness in online manner on basis of laser light scattering processes
  • System and method for measuring surface roughness in online manner on basis of laser light scattering processes

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] Such as figure 1 As shown, in this embodiment, an online surface roughness measurement system based on the laser scattering method is mainly composed of a laser 1 , an acquisition screen 2 and a data acquisition system 3 .

[0042] The laser 1 emits a collimated laser beam, which is incident on the metal surface to be tested at a set angle (such as 30°). The output of the laser is: wavelength λ=632.8nm, power 5mW.

[0043] The collection screen 2 is a transmissive hard frosted glass, which is placed in the reflection direction to collect the spatial distribution of reflection and scattered light carrying information on the roughness of the metal surface, and the height of the collection screen is consistent with the height of the laser, thereby ensuring that the scattered light band of symmetry.

[0044] The data acquisition...

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Abstract

The invention provides a system and a method for measuring surface roughness in an online manner on the basis of laser light scattering processes. The method includes carrying out oblique incidence onlaser beams to the surfaces of measured objects at set angles; photographing scattered images on acquisition screens in reflection directions of the laser beams and extracting at least one of three feature parameters including a scattering feature parameter, a bright point ratio and a bright point gray ratio of each scattered image; computing roughness numerical values by the aid of relation curves between the feature parameters and the surface roughness. The heights of the acquisition screens are consistent with the heights of laser devices. Curve fitting is carried out on feature parametersof scattered images of standard roughness sample pieces and known roughness numerical values to obtain the relation curves. The system and the method have the advantages that the surface roughness ofmachined workpieces can be measured in the online manner by the aid of the method, accordingly, the quality of products can be guaranteed, and the productivity can be improved; the system and the method are combined with transparent window measurement modes, and accordingly the surface roughness (Ra ranging from 0.025 micrometer to 0.8 micrometer) of ground metal can be measured in the online manner under cooling liquid machining conditions.

Description

Technical field: [0001] The invention relates to an on-line measurement system and method for the surface roughness of a workpiece based on a laser scattering method, and is especially suitable for detecting the quality of the metal surface in the grinding process. Background technique: [0002] On-line detection of the workpiece surface means that the quality of the workpiece can be detected simultaneously during the processing of the workpiece. It can feed back the quality of workpiece processing to the control system, so as to control the entire processing process more actively, ensure product quality and improve productivity. [0003] Surface roughness is a key indicator to measure the surface quality of workpieces. The surface roughness measurement methods commonly used in the industry can be roughly divided into two types: contact type and non-contact type. In the contact measurement method, the measurement device will be in contact with the surface to be measured du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/30
CPCG01B11/30
Inventor 郭瑞鹏边栋梁王海涛徐贵力
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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