2023, Vol. 27 ›› Issue (7): 1012-1016

Selective laser melting forming process and deformation experiment of titanium alloy full crown

Wang Shuxiang, Wu Quan, Zhou Xiaosong, Kuang Xiantao   

Abstract: BACKGROUND: Full crowns have variable shapes and sizes, and are used for tooth restoration. This type of thin-walled parts usually requires high precision, light weight and thin wall thickness, but it is easy to deform during forming and reduce the accuracy of the workpiece.
OBJECTIVE: To explore the influence of different energy densities on the deformation of titanium alloy full crowns, and obtain the optimal combination of process parameters for forming titanium alloy full crowns.
METHODS: The full crown of Ti-6Al-4V titanium alloy was formed by selective laser melting. The influence of energy densities (77.38, 48.15, 32.83, 71.76, 46.97, 61.51, 68.18, 85.71, 55.56 J/mm3) on deformation was studied. The process parameters were optimized, and the parts printed after parameter optimization were heat treated.
RESULTS AND CONCLUSION: Deformation experiments showed that a reasonable combination of process parameters could reduce the degree of deformation of the formed parts. When the energy density was 68.18 J/mm3 (laser power, scanning speed, and scanning distance were 180 W, 800 mm/s, 0.11 mm, respectively), the average value of deformation of the specimen formed at this energy density was 1.594 mm, which was smaller than the deformation of the cantilever beam at other energy densities. Under the optimized combined process parameters, the average amount of deformation after heat treatment was 0.355 mm; the average roughness was 8.306 μm; the average hardness was 345 HV, in line with industry standards. The research results provide experimental data and theoretical basis for forming high-quality thin-walled parts.
Key words: selective laser melting, Ti-6Al-4V alloy, full crown shaping, process parameter, deformation, full crown