A Design Method of Blank Shape for Die Forging Diesel Engine Crankshaft

Abstract

The invention belongs to the field of forging and particularly discloses a blank shape design method for a die-forging diesel crankshaft. The method is suitable for a die-forging forming process of some diesel crankshafts. The blank sectional shape of the die-forging diesel crankshaft is a two-direction circular arc composed of two circular arcs and two straight lines. The specific design method comprises the steps that first, one or two or more crank throws with the most consumed material in a crankshaft forging are selected to serve as analysis objects, the diameter of the bar material is derived according to the equal volume theory, and a blank sectional area is calculated; second, an appropriate width-to-height ratio is determined according to the equal sectional area principle, and a high narrow two-direction circular arc blank section is designed; and third, the high part of a high narrow blank is placed along the die-forging deformation direction for die-forging. Through the method, the material utilization rate can be increased, production cost can be saved, and the problem that filling of special-shaped structures, especially a balance weight part with a large quantity of consumed materials and a large height-to-width ratio, of crankshaft forgings and the like is difficult can be solved.

Description

technical field [0001] The invention belongs to the field of forging, in particular to a blank shape design method for die forging diesel engine crankshafts, which is suitable for the die forging forming process of some diesel engine crankshafts, can improve material utilization and reduce production costs. Background technique [0002] As an important working part in the engine, the crankshaft not only bears the impact load but also transmits a large torque during the reciprocating operation. Therefore, there are higher requirements for the performance indicators of the crankshaft such as fatigue, strength, and dynamic balance. How to It becomes more important to ensure good mechanical properties by improving the forming process of the crankshaft. Compared with the cast crankshaft, the forged crankshaft is beneficial to reduce the working noise and vibration of the engine, and has improved wear resistance, which is more suitable for the development of automobiles with high ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a blank shape design method for die forging diesel engine crankshafts, so as to solve the problem of difficult filling of special-shaped structures such as crankshaft forgings, especially the balance weight part that uses more materials and has a larger height-to-width ratio

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