Radial cam loading and low-cycle fatigue splitting equipment for subdivision-type connecting rod fracture splitting

Abstract

Radial cam loading and low-cycle fatigue splitting equipment for subdivision-type connecting rod fracture splitting comprises a base. The left side and the right side of the base are fixedly connected with four vertical columns. A cross beam is fixedly connected with the upper sides of the four vertical columns. Servo motors are bilaterally and symmetrically installed on the cross beam. The servo motors are connected with a cam plate lifting mechanism installed on the upper portion of a spline shaft. A motor decelerating power mechanism is connected with the lower portion of the spline shaft. The middle of the spline shaft is connected with a main working table. An upper end cam plate and a corresponding lower end cam plate of the main working table impact the upper end and the lower end of a core rod simultaneously, so that a connecting rod large head hole with a prefabricated fracture splitting groove is loaded repeatedly, and low-stress fatigue separating of the connecting rod large end and a connecting rod body is completed. The radial cam loading and low-cycle fatigue splitting equipment for subdivision-type connecting rod fracture splitting has the advantages of being environmentally friendly, energy saving, high in machining efficiency, wide in application range and good in fracture surface quality.

Description

technical field [0001] The invention belongs to the technical field of split connecting rod cracking processing for internal combustion engines, and in particular relates to radial cam loading and low cycle fatigue cracking equipment for split connecting rod cracking. 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 comp...

AI Technical Summary

Problems solved by technology

[0004] However, these technologies and equipment have the following disadvantages: due to the use of hydraulic quasi-static loading, the hydraulic circuit pipe diameter, valve diameter, pump flow rate, hydraulic cylinder parameters, etc. will affect the loading speed of the cracking cylinder. The main problem of this type of process is the bursting phenomenon after the rod breaks; one-time loading and breaking, the breaking force is large, and the pressure requirements for the master cylinder are high; only a single connecting rod can be processed, and the cracking efficiency is low; the cracking materials are uniform It is a powder metallurgy brittle connecting rod with narrow application range

However, this technology still has the following disadvantages: the loading method is still radial loading, and if the loading speed is too fast, the fatigue loading method will change to quasi-static loading cracking, which will cause the connecting rod to crack too quickly and the section quality is poor; During the process, the connecting rod is subjected to an asymmetric force

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