Abstract
In modern day high-performance space optical systems, precision surface grinding of quartz glass freeform surface has been widely utilized in the initial stage of component machining. Investigations regarding material removal mechanisms present an essential link to ensuring both machining accuracy and quality. Currently, removal mechanisms of quartz glass investigations are mainly focused on straight line scratch and parallel scratch experiments. The material removal mechanism of high-speed cross scratch on machined surface is rarely considered. In order to investigate the removal mechanism of the high-speed cross scratch material, a new scratch test method based on trochoid feed was proposed. The cross-point effect of quartz glass was investigated through high-speed scratch experiment with variable cutting depth. The experimental results show that the cross-point area formed by high-speed cross-scratches is more damaged and enters brittle removal earlier than other areas. In the area of brittle removal, the damage distribution of high-speed cross scratches at the crossover point is approximately symmetrical. The cutting forces at the inlet and outlet of the intersection area are different, resulting in a different fracture morphology. The reflection fracture of stress wave caused by impact load is the key factor leading to the cross-point effect of the intersection area.
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