Study on Impact Stress Characteristics in Ultrasonic Cutting and Brittle Material Removal Mechanism

Abstract:

The impact of cutter against the materials can be regarded as the rigid ball with certain energy oblique impact against the semi infinite space in the ultrasonic vibration cutting process. The cutter and materials three-dimensional surface stress state was theoretically deduced from building the dynamic shock model in Hertz contact state. Ultrasonic vibration cutting in the tiny cutting depth can be regarded as the contact extrusion process of blunt pressure head oblique impact on materials, the material indentation and crack development trend was given based on the surface stress analysis and test results of rigid ball oblique impact on the glass. The indentation and crack development of spherical pressure head oblique impact on the brittle materials was analyzed, material failure in the back edge with deeper crack is controlled by tensile stress, the tensile stress values depend on the friction coefficient and the normal pressure, material failure crack caused by shear stress on both sides exist on the material surface. Ultrasonic vibration can reduce normal pressure and crack to come into being. Cutting fluid lubricating can reduce the friction coefficient to control with only shallow crack produced in the cutting process.

• Periodical: Advanced Materials Research (Volumes 753-755)
• Pages: 287-297
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.753-755.287
• Online since: August 2013
• Authors: Jun Pi, Guang Yang, Fei Ye
• Keywords: Dynamic Impact, Shallow Crack, Stress Distribution, Ultrasonic Cutting

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