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Aiming at low efficiency, low accuracy and other issues existing in large lathes geometric precision detection, the paper proposes a new method of measuring geometric precision of lathes. The method is based on the principle of GPS positioning, Using a laser tracker on four different positions, the coordinates of the same target points with a continuous trajectory could be acquired. By a large number...
Aiming at the disadvantages of present methods for detecting machine geometrical precision, the multistation and time-sharing measurement method is used to detect the machine precision in the research. Laser tracker measures the same trajectory of the machine at different base stations successively. Then the coordinates of different measuring points in the machine motion process can be calibrated...
Being one of promising development trends of coordinate measuring machine(CMM), non-contact measuring model has been paid more and more attentions, which is especially suitable for those soft, fragile and easy-deformed workpiecs. CCD camera has pretty high precision for 2D image measurement and can capture plenty of information each time. Meanwhile, the laser probe can achieve very high precision...
CMM (Coordinate Measuring Machine) is used as an accurate measuring instrument in manufacturing and design of products. High accurate CMM is required by the development of super-finish, micro-machinery, micro-electronic mechanical systems (MEMS). The precision of CMM is influenced by its volumetric error and dynamic error. The volumetric error is the major component during slowly probing, but the...
In view of the inherent localization of traditional contact CMM, we exploit a miniature five-coordinate laser and CCD compound measuring machine. It is competent to measure such kind of workpieces which are soft, easy-deformed and with complex structure. This machine adopts several key technologies including the latest digital measuring technique, high-precision mechanical structure, laser prober...
Inspection of parts is a requirement to assure quality and to reduce manufacturing costs and rework. This paper presents an inspection system of characteristic of sheet metal parts with large and complicated curved surfaces used widely for manufacturing applications. Sheet metal parts with large and complicated curved surfaces are distorting easily, loading and unloading difficultly. It is very difficult...
Measurement of free-form surfaces is a requirement to assure quality and to reduce manufacturing costs and rework. An on-line measurement system combined coordinate measuring machine (CMM) and numerical controlled (NC) sandblast manufacturing equipment for large surface is presented in this paper. It uses transmission and position functions of NC machine and CMM's scan measuring function to make large...
Automated inspection of parts is a requirement to assure quality and to reduce manufacturing costs and rework. This paper presents an inspection system of sheet metal parts with large and complicated curved surfaces used widely for manufacturing applications. For such sheet metal parts, which is characterized by a great volume, a big area, deforming easily and its loading and unloading can be difficultly,...
Against the measurement for the roll angle of coordinate measuring machine and machine tools used the linear guide, based on the optical principle of optical components to linearly polarization light, a new and simple method for the roll angle measurement is proposed, in which a half wave-plate is used as sensitivity part. If the stage has a roll angle with respect to the reference base, it can be...
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