Abstract
For online quality control of car engine production, pneumatic measurement instrument plays an unshakeable role in measuring diameters inside engine block because of its portability and high-accuracy. To the limitation of its measuring principle, however, the working space between the pneumatic device and measured surface is too small to require manual operation. This lowers the measuring efficiency and becomes an obstacle to perform automatic measurement. In this article, a high-speed, automatic measuring system is proposed to take the place of pneumatic devices by using a laser-based measuring unit. The measuring unit is considered as a set of several measuring modules, where each of them acts like a single bore gauge and is made of four laser triangulation sensors (LTSs), which are installed on different positions and in opposite directions. The spatial relationship among these LTSs was calibrated before measurements. Sampling points from measured shaft holes can be collected by the measuring unit. A unified mathematical model was established for both calibration and measurement. Based on the established model, the relative pose between the measuring unit and measured workpiece does not impact the measuring accuracy. This frees the measuring unit from accurate positioning or adjustment, and makes it possible to realize fast and automatic measurement. The proposed system and method were finally validated by experiments.
Highlights
On car engine production lines, the dimensional measurement of shaft holes inside engine block is critical and difficult, and has a great impact on ultimate product quality [1]
We developed a high-speed automatic measuring system for shaft holes inside engine block
The performed experiments allow validating the inspection of shaft holes inside engine block
Summary
On car engine production lines, the dimensional measurement of shaft holes inside engine block is critical and difficult, and has a great impact on ultimate product quality [1]. An ideal measuring method and system in production engineering needs to be automatic, fast and accurate To meet these requirements, there are two difficulties in measuring shaft holes inside engine block. In the production line of 4 H engine blocks, the accuracy requirement of inner diameters is 5 μm and the objective parameters should be measured within 4 min. We developed a high-speed automatic measuring system for shaft holes inside engine block. Compared with such probes in [8,9,10], the proposed system can measure multi-parameters simultaneously and its measuring efficiency can meet the requirements of lean production.
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