BK7 optical glass is widely used as aerospace optical window. Precision grinding is a common method for machining BK7 optical elements. CVD diamond grinding wheel is a cutting tool with excellent wear resistance, which can realize high efficiency grinding for BK7. However, due to its small chip space, the surface quality will be affected by the large grinding force and difficult chip removal. In this paper, micro-grooves with different angles and widths were fabricated on CVD diamond grinding wheel surfaces by picosecond laser to improve the chip space. The grinding experiments of BK7 were carried out using these micro-structured wheels. The results show that the grinding force was reduced by 80% at most compared with the unstructured wheel, and the machined surface roughness was also decreased by up to 85%. The grinding force of structured CVD diamond grinding wheel decreases with the increase of the surface micro-structure groove angle. With the increase of groove width on the surface of structured CVD diamond grinding wheel, the surface roughness of the workpiece decreases first and then increases. When the groove width is 80μm, the surface roughness of the workpiece reaches the minimum value.
Compared with conventional grinding tools, the chemical vapor deposition (CVD) diamond grinding tools have lots of advantages. However, the practical application of CVD grinding tools is limited, because of the small chip-holding space of abrasive layer. Based on the previous research, the structured grinding tools identified as an available method to improve grinding performance. Therefore, the micro-structured CVD diamond tools were invented. In this paper, the picosecond pulse laser was adopted to machine the micro-structures on CVD diamond. The ablation threshold of CVD diamond film was obtained with picosecond pulse laser. And then, the micro-grooves were machined on diamond film surface with different laser machining parameters. The effects of defocus, laser power, scanning speed, scanning times and machining offset on groove width and depth were analyzed respectively.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.