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In time-sharing measurement method, system self-calibration is very important to improve detection accuracy. In traditional time-sharing measurement method, system self-calibration is finished by lots of targets coordination from NC machine moving. This self-calibration method not only needs complex motion trajectory but also increases repeatability errors. In this paper, a new system self-calibration...
The laser tracker is adopted the multi-station and time-sharing measurement principle to rapidly and accurately detect the precision of machine tool. In accordance with international standard, the measurement results should also give the corresponding measurement uncertainty. In the paper, the Monte Carlo method is used to evaluate the measurement uncertainty of laser tracker's multi-station and time-sharing...
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...
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...
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...
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