Machining device and method for resonance auxiliary cracking of connecting rod

Abstract

The invention provides a processing device for resonance-assisted cleavage of connecting rods, which includes a vibration mechanism of an exciter, a working platform, a compacting mechanism for a small head hole of a connecting rod, a cracking mechanism for a large head hole of a connecting rod, and a back pressure mechanism of a connecting rod; The vibrator is installed on the top of the connecting rod; the connecting rod big hole cracking mechanism includes a wedge-shaped pull rod, cracking fixed sleeve, cracking moving sleeve and cracking hydraulic cylinder; the connecting rod small head hole pressing mechanism includes an adjustment block and a screw nut mechanism The connecting rod back pressure mechanism is fixed on the slider, and the connecting rod back pressure mechanism produces a back pressure acting on the large end of the casting connecting rod; the connecting rod back pressure mechanism is fixed with a vibration sensor, To measure the vibration frequency of the connecting rod after the back pressure is applied. The invention can reduce the required cracking force and the deformation of the fracture surface and the number of slags on the fracture surface during cracking of the casting connecting rod, thereby reducing the processing cost.

Description

technical field [0001] The invention relates to the fields of connecting rod processing and mechanical vibration, in particular to a processing device and method for resonance-assisted cracking of connecting rods. Background technique [0002] Connecting rod cracking technology is currently the most advanced connecting rod precision machining technology in the world. Its principle is to pre-process specific cracking grooves on both sides of the big hole of the connecting rod blank (casting billet or forging billet) according to the fracture characteristics of the material. Make it form an initial fracture source due to stress concentration, and then apply a cracking load to make the crack directional expand along the cracking groove, and finally achieve brittle fracture. This technology does not require additional processing of the joint surface of the connecting rod body and the connecting rod cover, but uses the fully repeatable canine tooth structure that is naturally for...

AI Technical Summary

Problems solved by technology

Although this patent uses low-frequency cracking of the connecting rod, it uses multiple impacts on the connecting rod instead of one-time cracking, so the work efficiency is low, and it cannot solve the problems of slag falling during the cracking process.

[0006] The patent announcement number is CN103091184B, which discloses a sub-ultrasonic high-frequency fatigue testing machine, which uses high frequency to replace the low frequency used by traditional fatigue testing machines, which can effectively shorten the test cycle and save energy; but this patent It can only be used on small specimens, such as small tensile specimens; at the same time, the fatigue test takes a long time, mainly relying on high-frequency vibration to fatigue and fracture the specimen, and its load is small

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