A processing positioning device and processing method for bushing holes at both ends of a connecting rod

Abstract

The invention discloses a processing and positioning device for bushing holes at both ends of a connecting rod, which comprises: a pressing mechanism, a bottom plate, a V-shaped support (10) fixed on the bottom plate, a floating support (9), a first bottom support ( 7), the second bottom support (8) and the side positioning block (1), the V-shaped support (10) supports and positions the small end of the connecting rod to be processed, and the floating support (9) is arranged at the bottom of the small end of the connecting rod to be processed , the first bottom support (7) and the second bottom support (8) are arranged at the bottom of the big end of the connecting rod to be processed, the side positioning block (1) is arranged on one side of the big end of the connecting rod to be processed, and the pressing mechanism The big end and the small end are pressed and positioned. The invention can improve the processing and positioning accuracy of the big and small head holes of the connecting rod, effectively avoid the accumulation error and the occurrence of clamping and processing deformation, not only ensure the size, shape and position accuracy of the big head hole and the small head bushing hole of the connecting rod, but also ensure the stability and consistency of the precision Sex is also better controlled with great results.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a processing positioning device and a processing method for bushing holes at both ends of a connecting rod. Background technique [0002] The connecting rod is a key high-load moving part in the core moving parts of the engine. With the high-speed, high-power, and high-reliability performance requirements of the engine, the size, shape, position accuracy, and consistency of the big head hole and the small head bushing hole of the connecting rod The requirements are becoming more and more stringent. How to ensure the stability and consistency of the size, shape, position accuracy and control accuracy of the big end hole of the connecting rod and the bushing hole of the small end, the process method is the key link. [0003] The processing methods used in the processing of the original big head hole and small head bushing hole of a certain type of engine connecting rod ...

AI Technical Summary

Problems solved by technology

[0011] 1. After the positioning pin is pulled out, only the side positioning block is positioned, and the positioning is unreliable; there is a fit gap between the positioning pin and the positioning pin hole, and between the positioning pin and the small head hole of the connecting rod, and the accumulated error affects the consistency of the center distance between the big and small head holes of the connecting rod. Sex, even out of tolerance

[0012] 2. The wear of small head positioning pins and fixed pin holes also causes poor consistency in the size of the center distance between the big and small head holes of the connecting rod, and even out-of-tolerance

[0013] 3. There is a height difference H between the end faces of the big and small ends of the connecting rod (see the original method diagram), and the height difference of each connecting rod is about 0.04-0.1mm. The fit is very good, but there is deformation when clamping, resulting in inconsistent or out-of-tolerance parallelism between the small head hole of the connecting rod and the big head hole in the horizontal and vertical directions, and inconsistent or out-of-tolerance parallelism between the end of the big head hole and the center of the big head hole

[0014] 4. Although a torque wrench is used for manual clamping, the working state of the person will affect the real torque of the torque wrench, thereby affecting the parallelism of the connecting rod size head hole and the verticality of the big end face

[0015] 5. The fine boring blade of the small head bush hole wears quickly. In order to ensure the surface roughness of the small head hole Ra0.4, the blade needs to be replaced once when processing 60 small head bush holes.

[0016] 6. Clamping is difficult, and positioning pins are often difficult to install and remove, and the auxiliary processing time is long

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