Abstract
Oscillating grinding is a high-efficiency machining method for crankshaft pin journal, and motion model is one of the important foundations of oscillating grinding, which heavily affects the grinding quality. This paper proposes an analysis method of oscillating grinding motion model for crankshaft pin journal, which can provide an effective tool for engineers and technicians to quickly evaluate different motion models in practice. First, the method is described by performing characteristics analysis of oscillating grinding, including the velocity characteristics at grinding point and the performance of driving axis. A complete analysis flow is also given. Then, a numerical comparison example is given between two main oscillating grinding motion models, i.e. the constant linear velocity motion model (CLVMM) and the constant angular velocity motion model (CAVMM), and the results show that the CAVMM is more practical than the CLVMM by using the proposed method. Finally, a crankshaft pin journal grinding experiment is carried out on a prototype, and the result also indicates that the CAVMM is much better in practice, which validates the effectiveness of the proposed analysis method of oscillating grinding motion model.
Highlights
Crankshaft is the most important component of automobile engine [1], [2], which bears impact load and transfers power
The constant angular velocity motion model (CAVMM) is more practical than the constant linear velocity motion model (CLVMM) in theory, and an experiment validation will be carried out in section
Based on the proposed method, a numerical comparison example is given between the constant linear velocity motion model (CLVMM) and the constant angular velocity motion model (CAVMM)
Summary
Crankshaft is the most important component of automobile engine [1], [2], which bears impact load and transfers power. The oscillating grinding process, the NC system controls the linkage between grinding carriage-axis and workpiece rotation-axis to ensure that the grinding wheel is always tangent with pin journal, which eliminates the repeated position error and improves the machining efficiency. The motion model between grinding carriage-axis and workpiece rotation-axis is the important foundation of oscillating grinding [19], which will affect the grinding quality of crankshaft pin journal and the requirement of oscillating grinding machine tool. It has a great significance to establish a complete analysis method of oscillating grinding motion model, which should consider both theory and practice. Based on this point, the paper investigates an analysis method of oscillating grinding motion model for crankshaft pin journal. The rest parts of the paper are organized as follows: Section 2 performs the characteristics analysis of oscillating grinding; Section 3 gives a numerical comparison example between two oscillating grinding motion models; Section 4 performs the crankshaft pin journal grinding experiment; Section 5 states the conclusion
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