Magnetic Abrasive Finishing of Internal Surface of Aluminum Pipe Using Magnetic Machining Jig

Abstract

Magnetic abrasive finishing technology has been known very well in finishing of stainless steel SUS304 pipes to mirror finish standard. However, the applications in softer metal such as aluminum A2017 were difficult due to soft metal characteristic itself. In 2002, Zou and Shinmura had developed a new method of magnetic field assisted machining process using magnetic machining jig for SUS304 pipe [. The development has since then expanded in many research. This research finds the optimum finishing condition for mirror finish standard in internal surface of aluminum A2017 pipe. We use a 100% polyester fabric that does not cause scratch on the material and found that the optimum pole-pipe gap to be 13mm to achieve the best surface roughness Ra of 0.020μm after finishing, from surface roughness Ra of 0.195μm before finishing.

Effects of electrolysis on magnetic abrasive finishing of AA6063‐T1 tube internal surface using combination machining tool

“…In parallel, the surface roughness decreased, Figure 4. The finishing combination time pattern of both finishing method achieved surface roughness R a = 0.035 mm which consumed a total of 8 min of finishing time, compared to the previous study that consumed 30 min to achieve surface roughness R a = 0.028 mm [32]. The surface roughness for EMAF + MAF minimization was limited at R a = 0.035 mm likely due to the blunt cutting abrasive.…”

“…Inspection through microscope revealed the surface has pits associated with oxidation film. Therefore, a further finishing process of single magnetic abrasive finishing is required to maximize the removal of the oxide film and achieve a high finishing surface [21]. The theory of surface flattening using electrochemical machining in the experiment is identical to that of conducted previously [31].…”

“…These characteristics are among the reasons aluminum needs a special method to obtain a mirror surface finish [20]. In the previous result, the author had explained magnetic abrasive finishing to polish aluminum tube and the recommended conditions were explained [21]. There is also magnetic abrasive finishing application for other materials such as titanium, ceramics and glass that required specific finishing conditions [22].…”

Investigation of the finishing characteristics in an internal tube finishing process by magnetic abrasive finishing combined with electrolysis

“…10a, the finishing time of 10 min proved a shorter finishing process than the conventional method. 10 The time combination difference suggests that increasing the finishing time to over 2 min with EMAF in a 10 min process could not produce desirable results. The prolonged EMAF adversely affected the surface by thickening the oxidation film, thus making it harder to remove by MAF.…”

“…In the experiment, polepipe gap adjustment translates into the required machining force for oxidation film removal in the shortest time and a sufficiently gentle process so as not to scratch the aluminium surface. 10 By prolonging the EMAF finishing time, its influence on surface roughness and the mechanism of surface planarisation are studied. Finally, the mass removed and surface roughness changes are observed to understand the surface morphology improvement mechanism, especially in regard to the finishing times by EMAF and MAF, respectively.…”