The Design And Analysis Of A New Structure Full-Fiber Crankshaf Upsetting-Bending Hydraulic Press

Engine crankshaft is an important mechanical parts. It is subjected to periodic changes of bending and torsion torque when in working condition, at the same time beared the inertia force and vibration stress additionaly. Because the forces are complexity and heavy, the crankshaft is prone to failure of fatigue, this directly affects the safety of machinery. From the perspective of forging, in addition to the shape and size requirements, the strength, stiffness and toughness of crankshaft is required must much higher than ordinary forgings. In order to meet the performance needs, the crankshaft's internal defects should be less; organizational structure, fiber distribution should be reasonable; shapes and sizes should be accurate. Intensive study of crankshaft forging process and the development of special equipment has theoretical significance and application value, that ensure the quality and output of the crankshaft.The characteristics of the entire fiber crankshaft forging is the fibers of the product is continuous, and has reasonable distribution of the shape. Use the upsetting-bending to produce crankshaft will improve the mechanical properties. The world's first all-fiber-specific application of a horizontal press is an American's company. They use the dedicated two-way horizontal closed die forging hydraulic press to forging Diesel Engine Crankshaft.The entities are set up on the basis of the software Pro/ENGINEER. The outfit flow including two sections. One is a 36 MN four-post presses which is used for upsetting and forming. The other is a 20 MN C-type hydraulic machine which is used for the compactor and the crank pin dislocation. Large-scale finite element software ANSYS has been used to calculate the three-dimensional finite element to major part, analyzing the rationality of structural design and concentrated stress.In this paper, three-dimensional finite element model has been established for contact analyzing and optimizing of C-type hydraulic machine's rack stiffness, strength and overall performance. Four-post Hydraulic rack's tightening stress overall have been calculated and analysed by three-dimensional contact terms. Then according to the results amend the initial design.