Abstract
The straightness detection methods of different geometric elements are described in detail in GB/T 1133 6-2004, but there are still many difficulties in how to implement the method in engineering, for example, how to detect straightness in the production process of piston rods in large oil cylinders. Based on time-domain three-point method and the various requirements of straightness measurement in the process of large piston rods’ production, a method for detecting the straightness of the large rod with large length-to-diameter ratio was proposed and the measuring device was successfully developed. In addition, the influences of the three error sources including axial rotation angle, probe spacing and sampling interval on the measurement results are discussed in detail. Considering the production cost and the accuracy of the device, the parameters of the straightness detection device are optimized. The effectiveness of the method was verified by field experiments. It’s very important that the study provides a technical basis for the straightness detection of large slender rods.
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