Low-cycle fatigue cracking equipment for end cam of split type connecting rod to push multiple mandrels

Abstract

The invention discloses low-cycle fatigue cracking equipment for an end cam of a split type connecting rod to push multiple mandrels. The equipment comprises a base. A first stand column and a second stand column are fixedly connected to the two sides of the base respectively. A cross beam is fixedly connected to the upper side of the first stand column and the upper side of the second stand column. A motor reducing power mechanism is connected to the cross beam. The output of the motor reducing power mechanism is connected with the power input of a cam lifting mechanism. First sliding blocks connected to the two sides of the cam lifting mechanism are matched with first guide rails connected to the inner side of the first stand column and the inner side of the second stand column. When the equipment works, the end cam of the cam lifting mechanism is matched with the mandrels on a disc-shaped workbench, the disc-shaped workbench is connected to the base through a T-shaped groove table, the end cam is driven by the motor reducing power mechanism to rotate, the multiple mandrels and expansion sleeves are pushed to load a big end hole, provided with a prefabricated cracking groove, of the connecting rod repeatedly at the same time, and therefore low-stress fatigue separation of the big end of the connecting rod and a connecting rod body is completed. The equipment has the advantages of being environmentally friendly, capable of saving energy, high in machining efficiency, wide in application range and good in cross section quality.

Description

technical field [0001] The invention belongs to the technical field of cracking processing of connecting rods, and in particular relates to low-cycle fatigue cracking equipment in which end cams of split connecting rods push multi-spindle shafts. Background technique [0002] Connecting rod cracking is a new process of connecting rod processing. Using the theory of fracture mechanics, firstly, a cracking groove is prefabricated inside the big end hole of the connecting rod to form an initial crack, and then a radial force is applied to the inner surface of the big end hole through the cracking processing equipment to make the crack Expand outward from the inner hole until it is completely cracked. Finally, the connecting rod body and the end cover are fully engaged at the fractured surface, and the bolts are inserted and tightened to the required torque. Typical cracking processing equipment includes the "upper wedge" equipment of the German ALFING company and the "pull-down...

AI Technical Summary

Problems solved by technology

[0003] The existing cracking equipment can only process a single connecting rod, and the cracking efficiency is low; due to the use of hydraulic quasi-static loading, the pressure requirements for the main cylinder are relatively high, and the hydraulic circuit pipe diameter, valve diameter, pump flow rate, hydraulic cylinder parameters etc. will affect the loading speed of the pyrolysis cylinder. Research shows that the bursting phenomenon after the connecting rod is broken due to the loading speed is the main problem of this type of process

At the same time, the existing cracking methods are only suitable for the cracking of connecting rods of brittle materials such as microalloyed non-modulated carbon steel, and their application is limited.

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