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Home - News - Development Trend of Crankshaft Manufacturing Technology in the Future

Development Trend of Crankshaft Manufacturing Technology in the Future

December 14, 2022

Crankshaft is one of the key components of automobile engine, and its performance directly affects the life of automobile. When the crankshaft is working, it bears heavy load and constantly changing bending moment and torque. The common failure forms are bending fatigue fracture and journal wear. Therefore, the crankshaft material is required to have high rigidity, fatigue strength and good wear resistance.

latest company news about Development Trend of Crankshaft Manufacturing Technology in the Future  0
1. Foundry Technology
(1) Smelting
For the melting of high-grade cast iron, large capacity intermediate frequency furnace or variable frequency intermediate frequency furnace will be used for melting, and direct reading spectrometer will be used to detect the composition of molten iron. Spheroidal graphite cast iron is treated by subcontracting, new varieties of nodulizing agent are developed, and advanced inoculation methods such as stream inoculation, in mold inoculation and compound inoculation are adopted. The parameters of melting process are controlled by microcomputer and displayed on screen.
Development Trend of Crankshaft Manufacturing Technology in the Future

(2) Modeling
EPC will be developed and popularized. In sand casting, boxless injection molding and extrusion molding will be attached importance to and continue to be popularized in new or rebuilt plants. The original high-pressure molding line will continue to be used, and some key components will be improved to realize automatic core assembly and core lowering.


2. Forging technology
Automatic lines with hot die forging presses and electrohydraulic hammers as the main machines are the development direction of forging crankshaft production. These production lines will generally adopt precision shearing blanking, roll forging (cross wedge rolling) billet making, medium frequency induction heating, etc.

latest company news about Development Trend of Crankshaft Manufacturing Technology in the Future  1
3. Machining technology
In rough machining of crankshaft, CNC lathes, CNC internal milling machines, CNC broaching machines and other advanced equipment will be widely used for CNC turning, internal milling, and turning broaching of the main journal and connecting rod journal to effectively reduce the deformation of crankshaft processing. CNC controlled crankshaft grinder will be widely used to finish the crankshaft journal.
This grinder will be equipped with automatic dynamic balancing device of grinding wheel, automatic tracking device of center frame, automatic measurement, automatic compensation device, automatic dressing of grinding wheel, constant linear speed and other functional requirements to ensure the stability of grinding quality. It is estimated that the current situation of high precision equipment relying on imports will not change in the short term.


4. Heat treatment technology and surface strengthening technology
(1) Medium frequency induction hardening of crankshaft
Medium frequency induction hardening of crankshaft will adopt microcomputer monitoring closed-loop medium frequency induction heating device, which has the characteristics of high efficiency, stable quality and controllable operation.
(2) Crankshaft soft nitriding
For crankshafts produced in large quantities, in order to improve product quality, a nitrogen based atmosphere gas soft nitriding production line controlled by a microcomputer will be adopted in the future. The nitrogen based atmosphere gas soft nitriding production line consists of a front cleaner (cleaning and drying), a preheating furnace, a soft nitriding furnace, a cooling oil tank, a rear cleaner (cleaning and drying), a control system, a gas preparation and distribution system, etc.
(3) Surface strengthening technology of crankshaft
The fillet rolling strengthening of nodular cast iron crankshaft will be widely used in crankshaft processing. In addition, the composite strengthening processes such as fillet rolling strengthening and journal surface quenching will also be widely used in crankshaft processing. The strengthening method of forged steel crankshaft will adopt more journal and fillet quenching.
Main causes of crankshaft fracture:
(1) Engine oil deteriorates after long-term use; Serious overloading and over coupling lead to long-term overload operation of the engine and tile burning accident. The crankshaft was severely worn due to the burning of the engine bush.
(2) After the engine is repaired, the loading does not pass the running in period, that is, the engine is overloaded, and the engine is overloaded for a long time, which makes the crankshaft load exceed the allowable limit.
(3) During the repair of the crankshaft, overlaying welding was used, which destroyed the dynamic balance of the crankshaft and did not check the balance. The unbalance exceeded the standard, causing greater vibration of the engine and fracture of the crankshaft.
(4) Due to poor road conditions and serious overloading and over coupling of vehicles, the engine often runs within the critical speed of torsional vibration, and the shock absorber fails, which will also cause crankshaft torsional vibration fatigue damage and fracture.