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In this paper, we evaluated the fatigue and durability performance of a V-arm that supports the axle of a commercial vehicle and is subjected to vibration or shock load from the road surface. The V-arm is designed to have high strength in order to prevent damage due to vibration and impact load considering the use environment of the product. Therefore, the weight of the product also increases, which is one of the obstacles to the weight reduction of the vehicle. In order to lighten the V-arm with the above characteristics, the product was molded using the die casting method. The die casting method is widely used as a manufacturing method capable of producing complex shapes at a high speed. The shape of the V-arm is relatively small, but the size and thickness of the product are larger and thicker than those of the general die casting, making it difficult to develop the product. It is necessary to develop the production technology and evaluate the fatigue load technically. In order to evaluate the reliability of the product using the high vacuum diecasting technique, fatigue analysis was carried out using fatigue limit test and ANSYS n _Code Design Life using samples obtained from the developed product.
This paper represents the s-cam manufacturing process with the high-carbon steel like S45C using laser welding system. Laser welding of the high-carbon steel is generally difficult because of hardening of the weld zone. Also, existing s-cam manufacturing process, electric resistance welding system, have some problems like increase of production and development cost. To solve those problems, we are introduced the laser welding system with the pre-heating system for precision welding of s-cam with separated shaft and cam part. S-cam manufactured with optimum laser welding conditions is verified the performance like tensile strength, torsional strength and fatigue test. Strength and fatigue test results are described.