Research on Temperature Effect of CMM Precision Measurement on Engine Cylinder Block
Cylinder block(CB)is one of the core parts of engine,its manufacturing process and product di-mension quality control are key tasks in industry.Dimension accuracy of CB is very high,and dimension assur-ance need high accurate CMM machine.Temperature is an important factor affecting precision,this paper will study its specific impact from following two aspects:Firstly,the calibration of high-precision CMM and daily calibration are highly sensitive to temperature,and temperature fluctuations will directly affect the calibration data,thus further affecting the work-piece measurement results.This paper will study its specific impact through designed experiments.Secondly,the sufficient constant temperature process of the work-piece is an im-portant prerequisite for achieving precision result.Especially for cylinder block,adapter will be assemble during machining process.The constant temperature process is complicated due to the difference in the specificity of the constant temperature of different materials.Studying how to improve the constant temperature efficiency and en-sure the accuracy of the results is of great significance to the production.
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