Crankshaft manufacturing technology in the future
The crankshaft is one of the key components of an engine. The crankshaft is subjected to large loads and changing bending moments and torques, and common forms of failure are bending fatigue fracture and journal wear.
For melting of high grade cast iron, a high capacity IF furnace or frequency conversion IF furnace will be used for melting and a direct reading spectrometer will be used to detect the composition of the molten iron. The ductile iron treatment will be carried out by transferring the ladle, developing a new variety of nodulising agent and adopting advanced nurturing methods such as in-flow nurturing, in-type nurturing and compound nurturing. The parameters of the melting process are controlled by microcomputer and displayed on the screen.
Vanish mould casting will be developed and promoted. In the sand casting, no box injection molding and extrusion molding will be attached importance and continue to promote the application of new plants or conversion plants. The original high-pressure moulding line will continue to use, some of the key components will be improved to achieve automatic core formation and core down.
2, forging technology
Hot die forging press, electro-hydraulic hammer for the host of the automatic line is the development direction of forging crankshaft production, these production lines will be commonly used to shear off, roll forging (wedge cross-rolling) billet, medium frequency induction heating, etc.
3, mechanical processing technology
Crankshaft rough machining will be widely used CNC lathe, CNC milling machine, CNC lathe and other advanced equipment for the main journal, connecting rod journal CNC turning, milling, turning - pulling processing, in order to effectively reduce the amount of crankshaft processing deformation. CNC-controlled crankshaft grinding machines will be widely used for finishing crankshaft journals.
The reasonable choice of materials and the requirements of the prescribed heat treatment for drop-forged parts are important to increase the strength and service life of shaft components and, at the same time, have a large impact on the processing of shafts. Shaft components are generally made of 45 steel, with different heat treatment specifications (e.g. normalised, tempered, quenched, etc.) to obtain strength, toughness and resistance to wear, depending on the working conditions.