Using workpiece vibration cutting for micro-drilling

Abstract

The purpose of this paper is to investigate the effects of assisted vibration on the drilling quality of aluminium alloy (Al 6061-T6) and structure steel (SS41). In the past, research methodology of vibration drilling on small-diameter holes has mainly involved vibrating from the spindle side. In this paper, a new approach to obtain the desired vibration is proposed from the workpiece side, by a self-made, vibrating worktable. Through extensive experiments with a twist drill size of 0.5 mm, we found that hole oversize, displacement of the hole centre, and surface roughness of the drilled wall could be improved with the increase of vibrating frequency and amplitude. Roundness of the drilled hole could also be improved when high amplitude and proper frequency are imposed.

Mechanical Drilling Processes for Titanium Alloys: A Literature Review

“…Many researchers have investigated the issue (Adachi et al, 1987;Chern and Lee, 2006;Jin and Murakawa, 2001;Onikura et al, 1996;Takeyama, 1991). Since 1970s, vibration drilling has been employed in the precision drilling of wood (Kumabe and Sabuzawa, 1971) and low carbon steel (Kumabe and Sabuzawa, 1972).…”

Study on boring and drilling with vibration cutting

“…2. Piezoelectric actuators had been utilized to produce high-frequency vibration in the previous VC researches [6][7][8]13,14]. Piezoelectric actuators possess the characteristics of fine precision, quick response and large driving force.…”

“…The range and number of levels of the parameters are selected as listed in Table 3. The parameters are chosen based on our previous study in drilling with VC [8], knowing that feed and spindle speed in drilling are important in burr formation. The natural frequency of the vibration worktable was found to be around 13 kHz.…”

“…VC is applied to both drilling and boring operations with different vibration devices. Vibration drilling is carried out by employing the vibration worktable which the author had developed [8]. Fig.…”

“…Thus the utilization of VC decreases the hole oversize, reduces the friction between chip and rake face and improves the surface roughness. Chern and Lee [8] proposed a new approach to obtain the desired vibration from the workpiece side. Through extensive experiments with a twist drill size of 0.5 mm, they found that hole oversize, dislocation of the hole center and surface roughness of the drilled hole inner surface could be improved with the increase of vibration frequency and amplitude.…”