Processing technology for high-bearing-capacity high-load connecting rod surface shot peening strengthening

Abstract

The invention provides a processing technology for high-bearing-capacity high-load connecting rod surface shot peening strengthening. The processing technology for high-bearing-capacity high-load connecting rod surface shot peening strengthening comprises the following steps that (1) a connecting rod is positively hung through a lifting appliance, the hanging height of the connecting rod is 135 mm, and first shot peening is carried out for 2.5 to 3.5 minutes; and (2) the connecting rod is hung upside down through the lifting appliance, the hanging height of the connecting rod is 135 mm, and second shot peening is conducted for 2.5 to 3.5 minutes. The processing technology for high-bearing-capacity high-load connecting rod surface shot peening strengthening provided by the invention breaks through the technical difficulties that the connecting rod body shot peening surface quality is poor and residual stress distribution is uneven, uniform and stable residual compressive stress is formed on the connecting rod shot peening surface, the surface quality of an imported connecting rod shot peening object is achieved, the fatigue resistance of the connecting rod is improved, the phenomenon that the connecting rod is broken due to the fact that fatigue cracks are generated on the surface of the connecting rod under the action of high explosion pressure and long-term high alternating load is avoided, and the use reliability of the connecting rod is improved.

Description

technical field [0001] The invention belongs to the field of shot peening strengthening of connecting rods, and in particular relates to a processing technology for shot peening strengthening of the surface of a high-load high-load connecting rod. Background technique [0002] The crank-and-rod mechanism of a high-power diesel engine mostly adopts a parallel connecting rod structure. During the working process, since the connecting rod shaft has to withstand high explosive pressure and long-term alternating loads, there are high requirements for the fatigue resistance of the shaft. The method of shot peening is used to achieve the purpose of improving the anti-fatigue performance. [0003] The material of a certain type of connecting rod is 42CrMo, and the hardness is HB261-304. In the original shot peening process, due to the insufficient coverage of the shot peened shaft, the shot peened surface quality is poor and the residual stress distribution is uneven. Compared with...

AI Technical Summary

Problems solved by technology

In the original shot peening process, due to the insufficient coverage of the shot peened shaft, the shot peened surface quality is poor and the residual stress distribution is uneven. Compared with the imported connecting rod, there is a big gap between the shot peened surface quality and the imported connecting rod. Under the action of high burst pressure and long-term high alternating load, fatigue cracks are easily generated, which will cause the connecting rod to break

Images