Abstract
Cylindrical grinding is an important way to form the external shape error of the crank journal, and the accuracy consistency directly affects the interchangeability of products. To study the accuracy consistency of crank journal, a dynamic model of the grinding wheel-crankshaft grinding system based on Timoshenko beam is established, and the grinding transition process simulation algorithm with iterative convergence of grinding force-transient grinding amount cycle adapted to the model is proposed, which realizes the simulation of the roundness of the crank journal coupled with the process parameters of the grinding system. Aiming at the grinding position of each crank journal, the grinding roundness of five crank journals is simulated, respectively. On this basis, the crank journal roundness consistency prediction model is established, and the effectiveness of the prediction model is verified by field experiments. Finally, the influence of grinding parameters on the consistency of the roundness of crank journal is studied. The research conclusion can provide a reference for the grinding accuracy consistency design of this type of crank journal.
Highlights
The consistency of crank journal outer circle accuracy has an important impact on the stable operation performance of crankshaft [1,2]
On the basis of absorbing references [22~23], this paper further study the roundness consistency problem after grinding the crank journal, which is based on Timoshenko beam theory
The grinding of crank journal can be equivalent to cylindrical grinding, but the crank journal grinding is different from the general cylindrical grinding, this is because the existence of the crank makes the rigidity of the crankshaft poor, the stiffness along the crankshaft axis is not equal, and the stiffness of the crankshaft at different corners is different, so that the crankshaft produces unequal elastic deformation in the machining process, which will affect the consistency of machining accuracy of crank journal
Summary
The consistency of crank journal outer circle accuracy has an important impact on the stable operation performance of crankshaft [1,2]. Yuan Julong et al [5~7] established a grinding model for batch balls, and simulated the grinding trajectory of the cylindrical surface On this basis, the standard deviation of the trajectory density was used as a quantitative evaluation index for processing consistency. Wen Donghui et al [10~11] established a dynamic model for single-sided grinding processing, simulated the grinding processing path, and used the standard deviation of the distribution density of machining path points as the evaluation index to analyze the consistency of machining path on the workpiece surface. Wei,H.,et al.[14] established a prediction model of grinding material removal based on single abrasive and statistics, and verified the validity of the model through experiments On this basis, the influence law of workpiece surface contour height consistency was analyzed.
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