Introduction to crankshaft casting and strengthening technology
The crankshaft is the most important part in the engine and plays a significant role in the engine. Therefore, the crankshaft technical requirements are relatively high. Let me talk about the casting and strengthening technology of crankshaft for everyone, I hope it will be helpful to everyone.
Crankshaft casting technology
Smelt
Obtaining high temperature and low sulfur pure hot metal is the key to producing high quality ductile iron. The domestic production equipment is mainly cupola furnaces. The molten iron has not been pre-desulfurized. Secondly, there is less high-purity pig iron and the coke quality is poor. A cupola furnace is used to melt the molten iron, desulfurize it outside the furnace, and then raise the temperature in the induction electric furnace and adjust the composition. In China, the detection of hot metal components has been generally carried out by vacuum direct reading spectrometer.
Electroslag
The smelting and casting electroslag remelting technology is applied to the production of crankshafts, so that the performance of the cast crankshaft may be comparable to that of forging. And has the characteristics of fast research and development cycle, high metal utilization rate, simple equipment and superior product performance.
Styling
The airflow impact molding process is obviously superior to the clay sand molding process, which can obtain high-precision crankshaft castings. The sand mold produced by this process has the characteristics of no rebound deformation, which is especially important for multi-turn crankshafts. Some domestic crankshaft manufacturers have introduced airflow impact molding technology from Germany, Italy, Spain and other countries, but only a few manufacturers have introduced the entire production line.
Crankshaft strengthening technology
Crankshaft IF induction hardening
Crankshaft intermediate frequency induction hardening will use a microcomputer to monitor the closed-loop intermediate frequency induction heating device, which has the characteristics of high efficiency, stable quality and controllable operation.
Crankshaft soft nitridation
For mass-produced crankshafts, in order to improve product quality, a microcomputer-controlled nitrogen-based atmosphere gas soft nitriding production line will be used in the future. The nitrogen-based atmosphere gas soft nitriding production line consists of a front washing machine (washing and drying), a preheating furnace, a soft nitriding furnace, a cooling oil tank, a post-washing machine (washing and drying), a control system, and a gas distribution system.
Crankshaft surface strengthening technology
Ductile iron crankshaft fillet rolling strengthening will be widely used in crankshaft processing. In addition, round corner rolling strengthening plus journal surface hardening and other composite strengthening processes will also be widely used in crankshaft processing. Forging steel crankshaft strengthening methods will be more The ground is quenched by journal and rounded corners.
The above is the introduction of crankshaft casting and strengthening technology. I hope everyone will understand the crankshaft casting and strengthening technology, which will be helpful to everyone.