A Study on Precision Thread Grinding : Prevention of thermal deformation of workpiece arising from grinding heat

概要

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The authors have investigated the causes of pitch errors in leadscrews during grinding and reported that the thermal deformation (expansion or shrinkage) of the workpiece during grinding is one of the most dominant causes, that is, in case of using spindle oil as grinding fluid, the temperature of the workpiece rises gradually as grinding operations are repeated and the accumulated pitch error often amounts to several ten um. It is the purpose of this paper to prevent such thermal deformation of the leadscrews during grinding. The method is to shower the oil, the temperature of which is controlled teh same as that of the room, on the workpiece all over the length. The results show that this method is very effective to prevent the thermal deformation of the workpiece. Furthermore, theoretical analyses are tried on the temperature distribution in the workpiece and on the limit of fluid flow rate to prevent thermal deformation. The theoretical analyses agree with the experimental results, and it is considered that this method is applicable to various grinding conditions.
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