Five-star plunger loading and low cycle fatigue cracking equipment for split connecting rod cracking

Abstract

The invention discloses five-star plunger loading and low cycle fatigue cracking equipment of split type connecting rod cracking. The five-star plunger loading and low cycle fatigue cracking equipment comprises a base. The base is connected with four upright columns; the upright columns are connected with a variable frequency motor through a motor bracket; and the control end of the variable frequency motor is connected with the output end of a control cabinet. An output shaft of the variable frequency motor is connected with a belt wheel shaft through a clutch, a small belt wheel, a narrow V belt and a large belt wheel. The lower end of the belt wheel shaft is movably connected with a supporting frame, and the upper end of the belt wheel shaft is connected with the bottom end of an eccentric shaft through a coupler. Five-star wheels are mounted on the eccentric part of the eccentric shaft and arranged in an upper plunger body and a lower plunger body, wherein the upper plunger body and the lower plunger body are symmetrically arranged on the upper side and the lower side of a placing platform of the base. Each edge of the five-star wheels is connected with a plunger, and the plungers are inserted in the upper end and the lower end of a mandrel of a connecting rod large head hole of a prefabricated V-shaped cracking groove in a butting mode and power is repeatedly loaded simultaneously. The efficiency of connecting rod cracking is greatly improved, and the cracking equipment has the advantages of environmental friendliness and energy saving, high machining efficiency, wide application range and good 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 five-star plunger 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 ALFI...

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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

For example: the loading method is still radial loading, if the loading speed is too fast, the fatigue loading method will change to the cracking of quasi-static loading, which will cause the connecting rod to crack too quickly and the section quality will be poor; during the loading process of the connecting rod, the connecting rod will be damaged asymmetric force

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