Fixture for machining holes in large and small ends of automotive engine connecting rod

Abstract

The invention discloses a fixture for machining holes in large and small ends of an automotive engine connecting rod. The fixture comprises a small end fixture body, a large end fixture body, a support base and a plurality of clamping positioning units. One of the small end fixture body and the large end fixture body is movably arranged relative to the support base. Each clamping positioning unit comprises a small end positioning pin, a large end positioning pin, a small end positioning push-pull device driving the small end positioning pin to pull and push, a large end positioning push-pull device driving the large end positioning pin to pull and push, a positioning device for positioning a workpiece, and a clamping device for clamping the workpiece; the positioning device and the clamping device are correspondingly arranged on the large end fixture body. The fixture for machining holes in large and small ends of the automotive engine connecting rod has the advantages that the workpiece can be automatically clamped in the fixture, clamping effect is good, the center distance of the large and small ends of a positioning connecting rod can be adjusted to adapt to different types of workpieces for machining, multiple workpieces can be machined by single clamping, and production efficiency is greatly improved accordingly.

Description

technical field [0001] The invention relates to a fixture for processing connecting rods, in particular to a fixture for processing large and small head holes of connecting rods of automobile engines. Background technique [0002] At present, in the machining process of automobile engine connecting rods, due to the high precision requirements in the assembly process of the engine connecting rods, in order to improve the machining accuracy of the engine connecting rods, several processing procedures are involved, such as the size of the engine connecting rods. It may involve rough machining, fine boring, etc., and even the size of the head hole of the connecting rod has to go through rough machining, fine boring and other processes after the sleeve is installed. It can be seen that the size of the engine connecting rod head hole is very important. The biggest difficulty of this process lies in the design of the fixture. The quality of the fixture directly determines the quali...

AI Technical Summary

Problems solved by technology

This invention of the prior art still has the following defects: (1) single-piece fixed clamping is still used, which requires a lot of time and manpower to clamp the workpiece, which greatly wastes the processing time and increases the processing cost, thus The work efficiency is greatly reduced; (2) The workpiece is clamped by driving the eccentric clamping mechanism through the handle, so as to drive the pressure plate to compress the workpiece. In each clamping, it is necessary to manually operate the handle to clamp the workpiece. As a result, the clamping operation is cumbersome and the work efficiency is low, and the workpiece is clamped by locking the pressure plate through the operating handle. Due to the limitation of the force of the manual operation handle, the clamping force on the workpiece is not enough, and the workpiece may be loose. The processing is difficult in the processing, and the processing error is increased, so that the workpiece cannot reach the required precision, the production efficiency is low, and it is not suitable for mass and automatic production, which greatly increases the manufacturing cost; (3) This fixture is The connecting rod workpiece is positioned by the tungsten steel weldment, the support block on the bottom surface of the big head of the connecting rod, the eccentric locking part and the positioning mandrel. The positioning accuracy of the workpiece is low, and the positioning part of the workpiece is accurate during processing, and the big head and the The center distance of the small head cannot be adjusted. This kind of fixture can only process a single type of connecting rod, and cannot adapt to the processing of different types of connecting rods. The versatility is poor, resulting in low work efficiency.

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