Online Monitoring and Analysis of Hydroabrasive Cutting by Vibration

Abstract

The paper deals with the investigation of accompanying physical process, vibration, arising from the abrasive waterjet cutting of stainless steel. Samples of the square cross-section with the use of preplanned range of technological factors were cut. During the cutting of target material AISI 309 vibration by piezoelectrical accelerometers PCB IMI 607 A11 was recorded. The accelerometers were oriented perpendicular to the direction of the cut. Scanned data were processed through a virtual instrument created in LabVIEW 6.8. Sampling frequency of the recorded signal was 30 kHz. Investigated was development of the RMS value in particular frequencies. In order to confirm hypothetical assumptions about direct relation between vibration emission and surface quality, further experiment will be done. Current results are possible used for detection of defects during hydroabrasive cutting of materials, in case of focusing tube fracture, orifice damage in the cutting head, in case of fragile material cutting by means of controlled penetration.

Analysis of relation between the 3D printer laser beam power and the surface morphology properties in Ti-6Al-4V titanium alloy parts

“…7 The changes of spatial parameters of the side surface (B) in the variable laser power function: a average height (Sa) and root-meansquare height (Sq), b maximum peak height (Sp) and maximum valley depth (Sv) Microscopic images of the tested specimen's surface clearly indicate the influence of the position of the parts axis on the structural characteristics of the surface. According to many papers [31][32][33][34][35][36][37][38][39][40][41][42], the surface structure after laser melting is specific and different than the structure after machining processes [31][32][33][34][35][36]39], hydroabrasive [40,42] and laser machining [37]. Figure 9 shows an example of microscopic images of the top surface A and side surface B of the parts manufactured using laser power P = 175 W. Figure 9 clearly indicates the varied structure of the top surface A compared to side surface B.…”

“…This phenomenon is typical for the SLM process and was described in detail in [28,29]. Also, many authors [31][32][33][34][35][36][37][38][39][40][41][42] analysed the surface properties during different machining processes, like cutting, water-abrasive process and laser cutting.…”

Rationalization of manufacturing of plastic injection moulds by abrasive waterjet

“…Reasons for AWJ application consist especially in versatility [3,4] and well-known technological, ecological and economic benefits with a possibility of simple automation of this process [2,10,11,12,15]. Other significant reasons are the accuracy of a cut and little loss of material in the course of this cold process of cutting in comparison with other non-conventional thermal methods, during which a thermally affected zone is formed [2,3,9,10].…”

Abrasive Waterjet (AWJ) Forces—Indicator of Cutting System Malfunction

“…Several attempts aimed at determining the quality of the machining process through the measurement of the cutting head vibrations were presented few years ago [ 12 , 13 , 14 ]. Vibrations of the machined material are often studied to find some new method applicable for AWJ process monitoring [ 15 , 16 , 17 ]. Some of the scientists have found, however, that more than 25% of the information from these sources may be incorrectly explained [ 18 ] due to misinterpretation of signal characteristics.…”