A tool path generation method for quasi-intermittent vibration assisted swing cutting

Abstract

During the machining of freeform surfaces, the tool path will directly affect the machining accuracy of the surface, the execution of each axis of the machine tool, and the machining efficiency. Therefore, tool path planning is a very critical link in all types of diamond turning processes. In this paper, a new tool path generation strategy is proposed for machining freeform surfaces by quasi-intermittent vibration assisted swing cutting (QVASC) method. Due to the unique tool swing motion law of QVASC, the effective central angle of tool nose arc participating in the cutting is a parameter that is ignored by traditional cutting and is considered. This makes the generation of tool trajectories, tool geometry selection and freeform surfaces very different from traditional diamond cutting. According to the principle of QVASC, the tool parameters are analysed, and the tool position is designed in the cylindrical coordinate system. Interpolation was then performed by the Hermite spline interpolation theorem. The application of this strategy is discussed, and the sinusoidal surface, sinusoidal mesh surface and toric surface are taken as examples to simulate. The simulation succeeded in obtaining the tool path corresponding to the three curved surfaces processed by the QVASC method. The results prove that the tool trajectory generation strategy proposed in this paper is feasible. The proposed tool path generation strategy can provide a new reference for future freeform surfaces processing.

Modeling and Investigation of Minimum Chip Thickness for Silicon Carbide during Quasi-intermittent Vibration Assisted Swing Cutting

“…According to the traditional classical cutting temperature model, the main heat is divided into: the mechanical energy of fracture generated by the shear surface to make the chip, and the heat generated by the friction between the chip and the rake surface of the tool in the direction of chip removal. Considering the practicalities of ultra-precision machining, the following discussion is also necessary: because of the specific and precise nature of the QVASC machining method, the temperature model also needs to take into account the heat and cutting temperatures caused by significant ploughing and friction near the dead metal caused by the tool edge radius [2], as well as the lateral ploughing and friction generated on the surface by the QVASC during the tool feed swing. The above two parts are the fact that we calculate the mechanical energy generated by these parts of cutting through the slip line field model.…”

An analytical cutting force model of quasi-intermittent vibration assisted swing cutting based on predictive machining theory

“…Considering the chip transition layer, a new tool-chip friction model was proposed by Chen et al 21 In addition, Chen et al describes the shear strain rate and particle velocity of the three friction regions of the contact interface. A new tool path generation strategy, which uses the QVASC method to process free-form surfaces, was presented by Zhu et al 22 This paper establishes a cutting force prediction model based on Zhu’s device, which introduces the time-varying angle of cutting, and finally discusses the influence of cutting parameters on the cutting force during QVASC machining.…”