- 學位論文
挖土機帶動齒輪使用的材料與磨耗關係之探討
An Investgation on Relationship between Wear and Material Used for Driving Gear of Excavator
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摘要
本研究是探討挖土機行走帶動齒輪使用的材料與其磨耗的關係，選用的材料來自原廠、副廠替代品、S45C及SKD11四種材料，其中原廠、副廠為經過熱處理之中碳鋼，SKD11亦經過熱處理，S45C則否。將四種材料進行硬度分析、成份分析與磨耗分析，獲得其硬度與成份內容之差異性，再以相同條件進行磨耗試驗，比對再相同負荷與時間下材料的耐磨性。實驗結果以材料SKD11的硬度HRC 56為最高，耐磨耗值為1.2μm，也因此可以預估SKD11材質之帶動齒輪可使用的壽命可超過原廠帶動齒輪之8500小時；原廠帶動齒輪材料的硬度HRC 48，耐磨耗值為1.8μm；副廠替代品材料的硬度值為HRC 30，耐磨耗值為2.4μm，硬度值與耐磨耗值都比原廠材料為低，故其使用壽命相對比原廠少4000小時；材料S45C的硬度值為HRC 5，磨耗值為7.8μm，此種材料之硬度為最低，磨耗深度也為四種材料裡最深。透過四種材料之硬度與磨耗深度之結果，可以推導硬度與磨耗深度之關係式為Y=-0.0001X3+0.0138X2-0.5746X+10.343。此關係式可作為未來新材料應用於齒輪開發之預測磨耗深度。
並列摘要
This study intended to investigate the relationship between the materials of excavator’s drive gear and its wear. The materials were selected from the original factory, the alternative replacement, S45C and SKD11, where the parts from the original factory and the alternative replacement were the heat-treated medium carbon steel, while SKD11 was heat-treated and S45C was not. The four materials were analyzed for hardness, composition and wear to understand the variation in hardness in terms of their compositions. Then, their resistance against wear would be tested under the same load and duration. The experimental result showed that SKD11 has the highest hardness at HRC 56 with the wear resistance of 1.2μm; thus, it was estimated to have a service life of 8500 hours, more than the materials of drive gear from the original factory, which has a hardness value of HRC 48 and the wear resistance of 1.8μm. The hardness value of alternative replacement material was HRC 30 with the wear resistance of 2.4μm, in which both values were lower than the material of original factory, yielding 4000 hours of service life less than that of the original factory. S45C has a hardness of HRC 5 and the wear resistance of 7.8μm. It was the lowest in hardness and resulted with the deepest wear among all materials. By looking at the results of hardness and wear depth measurements of the four materials, the relationship between hardness and wear depth was deduced as Y=-0.0001X3+0.0138X2-0.5746X+10.343. This equation can be used as predictor of wear depth in the future material development for the drive gear.
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