A method of manufacturing an engine crankshaft

Abstract

The invention discloses a method for manufacturing an engine crankshaft and relates to the field of automobile parts manufacturing. The method includes the following steps: (1), blank casting; (2), hole drilling; (3), turning; (4), milling; (5), thermal treatment; (6), grinding; (7), chamferring; (8), checking and boxing. In the method, an airflow impact moulding process is adopted to manufacture a sand mould of the engine crankshaft, so that the manufactured sand mould has the advantages of being free of rebounding and deforming and the like, and high-accuracy crankshaft castings can be acquired; in the process of thermal treatment of the crankshaft, the crankshaft is normalized to remove internal stress inside a workpiece; a computer is adopted to monitor medium-frequency induction quenching, on the crankshaft, performed by a closed-loop medium-frequency induction heating device, so that quenching temperature and time can be controlled precisely, and good quenching effect of the crankshaft can be guaranteed; a curved surface chamferring machine is adopted to chamfer the crankshaft, so that working efficiency is improved, and the crankshaft is enabled to be practical and attractive.

Description

technical field [0001] The invention belongs to the field of automobile parts manufacturing, and more specifically, the invention relates to a method for manufacturing an engine crankshaft. Background technique [0002] The engine crankshaft is the main rotating part of the engine. After the connecting rod is installed, it can undertake the up and down movement of the connecting rod and turn it into a circular motion. It is an important part of the engine. Its material is made of carbon structural steel or ductile iron. There are two important parts: the main journal and the connecting rod journal. The main journal is installed on the cylinder block, the connecting rod journal is connected with the large end hole of the connecting rod, and the small end hole of the connecting rod is connected with the cylinder piston, which is a typical slider crank mechanism. The lubrication of the crankshaft mainly refers to the lubrication of the big end bearing bush of the connecting ro...

AI Technical Summary

Problems solved by technology

[0003] 1. The existing engine crankshaft manufacturing process is simple, the quality of the produced products is average, and the service life is generally not long;

[0004] 2. At present, most engine crankshaft blanks are produced by sand casting, but most of them have not been desulfurized before casting, resulting in high brittleness of the manufactured crankshaft, which is easy to break and fail;

[0005] 3. The processing accuracy of both ends of most existing engine crankshafts is poor, which affects the reference positioning and the accuracy of other dimensions;

[0006] 4. The final heat treatment of most existing engine crankshafts adopts ordinary quenching treatment, and the obtained mechanical properties of the crankshaft cannot meet the requirements, resulting in a low service life