ANALISIS KEKASARAN PERMUKAAN CONTACT SEAL PINION D375A-5 PADA HASIL FINISHING PROSES METAL SPRAY MENGGUNAKAN BELT POLISHER

Abstract

Repair contact seal pinion in this study uses a metal spray process. Metal spray is a process that aims to increase wear material by firing melt from a wire that is shortened using high-pressure wind. The results of metal spray are fairly rough because it requires finishing using a belt polisher (belt sand) to polish the rough results of the metal spray to be smooth. The purpose of this study was to determine whether the surface roughness of the pinion contact seal reconditioned with a metal spray process and finishing with the polish process using belt polisher had met the manufacturing roughness standard or not.

          Measurements will be carried out using a surface roughness tester where the contact seal surface is measured 2 points on 4 different sides and the standard roughness set by the manufacturer is 0.05 - 0.20 Ra µm. The variables used in this study include independent variables where the roughness of the sand grains on the sandpaper is 400 during the finishing process, the dependent variable in which the value of the surface contact seal pinion roughness after finishing and the control variable which is the spindle chuck rotation rate during the finishing process is 500 Rpm .

            Based on the results of the testing and calculation of the surface roughness of the pinion contact seal on the results of metal spray finishing process using a belt polisher (belt sandpaper) with a roughness level of 400 which is used in the polishing allowance of 0.10 mm from the contact seal diameter size then the results of point A surface contact seal before reconditioning 0.589 Ra µm and after reconditioning 0.181 Ra µm, at point B surface contact seal before reconditioning 0.525 Ra µm and after reconditioning 0.068 Ra µm. roughness at point A and B the surface of the contact seal entered in the standard manufacturing roughness that was determined that was 0.05 - 0.20 Ra µm