In recent years, is ASME B5.54 or ISO230-6 standard definition of the displacement body diagonal measurement method provides a fast machine room for error testing methods, Boeing and many other companies have been a good application. Because these measurements relatively simple and fast, so measuring costs and downtime are greatly reduced. However, the body diagonal displacement errors and 21 errors between rigid and did not express very clearly. In addition, the importance of the angle error was incorrectly inflated. In order to understand the relationship with the perspective and the importance of the error, it is necessary to export the 21 rigid body errors and measured the relationship between the diagonal displacement error.
Relationship matrix derived 21 rigid body errors include the following errors: linear displacement, vertical straightness, horizontal straightness, roll angle, pitch angle, yaw angle and the verticality of the three axes is 21 rigid body errors. Traditional laser interferometer to measure the straightness and the vertical error requires expensive time, so that developed for rapid detection of the body diagonal displacement method, which ASMEB5.54 or ISO 230-6 standard in detail Note.
Body diagonal displacement errors Body diagonal displacement of a laser interferometer to measure the volume positioning accuracy. Laser head on the machine table, and on the spindle of the mirror is reflected along the diagonal direction of the laser beam machine. 4 body diagonal measurement direction is ag, bh, ce and df.
Laser beam along the body diagonal, while some incremental mirror Zeyi move along the body diagonal. Start at the origin, along the diagonal each time increment to reach a new location, the three-axis displacement error on the measurement out. Body diagonal is positive axis (p) or negative axis (n) defined.
Last four body diagonal with the first four body diagonal in the same corner, but the direction is the opposite. To this end, only four body diagonal directions the forward and reverse movement (both ways); in X, Y, and Z-axis measurement after every move while only 4 settings. Accuracy of each position along the body diagonal depends on all three axis positioning accuracy and the geometric error of machine tools.
Theoretical results that the four body diagonal displacement error for all nine point two straight errors and the error is sensitive. Body diagonal displacement errors in the equation error term may be positive or negative, or they may cancel each other out. As the error terms from the statistical point of view, in all locations, and all four body diagonal probability of error can be offset is theoretically possible but actually not the case. As most of the angle errors were offset, leaving only two angle errors, and therefore concluded that body diagonal displacement errors, including three displacement errors, six straightness errors and three vertical error, the angle error is insensitive to. Which is conducive to rapid measurement of volumetric positioning accuracy.
Set of data because only 4 and 9 set error, the error sources of information so identified is not enough. This led to action by the United States of light and has patented, developed step by step diagonal measurement, or measurement technique called laser vector.
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