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실차 필드하중 기반 굴삭기 선회장치 가속 내구시험 설계
강병익(B. I. Kang),유재형(J. H. Yoo),이재옥(J. O. Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Durability of the excavator swing motor and reduction gear can be evaluated by numerical simulation or bench test. In case of numerical simulation using finite element model for example, it is not easy to take the swing inertia into account for simulation. Bench test, even though it is free from the difficulties in numerical modeling, should be carefully designed on the basis of actual field loadings for accurate and practically meaningful durability assessment. In this study, an accelerated durability test condition has been derived for excavator swing motor and reduction gear considering its actual operating conditions in field. To do this, specially designed measuring instruments are developed and then equipped at the swing device installed on an excavator. Torques and operating speeds collected from the measuring instruments contributed as fundamental data to the test design. The accelerated test condition designed herein is expected to give more practical criterion for durability assessment of the swing device.
강병익(B. I. Kang),길성희(S. H. Kil),조영도(Y. D. Joe) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The cylinder block of the main pump is a mechanical part that produces pressure through relative motion with piston. At this moment, the relative movement between the cylinder block and the piston may cause a seizure, and this seizure problem can be solved by pressing a bushing into the cylinder block. However, if the rates of shrink fit are insufficient, the copper bushing will be detached from the cylinder block and rates of shrink fit are excessive, a residual stress higher than yield stress of material will be generated and adversely affect the durability of bushing and the cylinder block. So, choosing rates of shrink fit is important. Therefore, in this study, a clear and quantitative rates of shrink fit is presented to solve the above-mentioned-problems, and to correct the durability assessment process of mechanical parts where residual stress occurs is performed. Through this study, analytical technique which can predict the residual stress clearly according to the rates of shrink fit was obtained and quantitative residual stress according to the rates of shrink fit was confirmed. Also, based on the residual stress, quantitative durability assessment of the cylinder block in consideration of the residual stress was completed. The results of this study are expected to be based on durability assessment of mechanical part with complicated production process.