MATERIAL POWER INFLUENCE OF BUCKET TEETH EXCAVATORAISI 4140 USING ABRASIVE WEAR TEST WITH OGOSHI UNIVERSAL HIGH SPEED TESTINGMETHOD

Abstract

The hard work of excavator should be absolutely supported by power influence and material strength of the excavator. In excavator, the part used as digging machine and lifting gear of material called excavator bucket. Direct contact of metal component with soil needs steel which has strength and high endurance of abrasion. The end part of this bucket functions as claws called bucket teeth which is the most possible part to fail when excavator operated. Bucket teeth material often used is mild carbon steelwith C composition is about 0,33%-0,5%, so that the material is considered not able to hold the pressuring and the hardness of pressured material in bucket teethexcavator.Even, it is frequently found many bucket teethexcavatorexperiencedabrasive or even fracture when doing hard work in the field. The hardness difference on bucket teethsurface and a bad material are the causes of failure. Power influence of bucket teethcan be known from chemical composition test, hardness test, micro graphy test, and abrasive wear test. From chemical composition test, it is found that bucket teeth material by using alloy steel AISI 4140 after treatment process is included into medium carbon steel with Carbon composition is about 0.38%.Hardness test uses Rockwell Hardness Tester hardness tool by using C Scale (HRC) with hardness value is47.75 HRCutilizing oilquenching.Abrasive wear test uses Ogoshi Universal High Speed Testingmethod which its wear value is 2.19 x 10-10mm2 /kg. From analysis result, it is found that the harder the material, the lower the wear level.