Abstract
The connecting rod is a critical part inside the marine engine. The inspection of its important parameters is directly related to the assembly and quality of the marine engine. A coordinate measuring machine (CMM) is a conventional choice to measure the parameters of a connecting rod. However, CMM requires significant resources in time and cost, which leads researchers into in-situ measurement. This article presents a fast and in-situ measuring method by using a laser-based measuring head. Two measuring strategies are adopted in the inspection process. For positional measurements (such as the hole–center distance), whose accuracy requirement is generally low, the coordinate system of the numerical control (NC) machine is combined with the measuring head to acquire the positional parameters. For dimensional measurements (such as inner diameters), whose accuracy requirement is rather high, the NC machine is used just as transportation. Note that the measuring head has the ability to perform the dimension inspection independently. The accuracy of the measuring head is high enough to meet the dimensional accuracy requirements. Experiments are performed to validate the proposed method. The measuring error of the inner diameters is from 5 μm to 7 μm. The measuring error of hole–center distance is within 15 μm. The measurement of all these parameters can be done within 1 min.
Highlights
Two processes are generally involved when manufacturing a workpiece
A fast and in-situ measuring method is presented in this paper for the parameters of a connecting rod
Based on the proposed method, a novel measuring head is developed by using several laser displacement sensor (LDS)
Summary
Two processes are generally involved when manufacturing a workpiece. One is the machining process, which is carried out to machine the parts; the other is the inspection process, which is performed to check whether the part is machined according to the requirements. In the case of the fabrication of marine engines, the time cost generated by transferring these large workpieces onto a CMM is the primary barrier to this method [2,3] Given this consideration, in-situ measurement seems a promising solution that is able to machine and measure simultaneously [4]. The main contributions in this paper include: Different the(|O probes in [5,6], the developed measuring head is able to measure inner diameters independently. Its in installation position and the movement accuracy of the inner machines (1) Different from the probes [5,6], the developed measuring head is able to measure diameters independently. Proposed method is validated by experiments in Section practicalis applications is analyzed inThe
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