Current status of domestic crankshaft processing

November 03, 2022

The crankshaft is one of the key parts of the engine, its structure is complex, the production batch is large, the variety is changed frequently, and the precision is high. The dimensional accuracy of the spindle connecting rod neck is IT6~IT7, the roundness is less than or equal to 0.005mm, and the surface roughness is Ra0.2~0.4. Therefore, an advanced crankshaft production line must not only achieve flexible conversion to meet market demand, but also meet process requirements, ensure processing accuracy, and finally produce qualified products. The forged steel crankshaft production line has the world's top numerical control machine tools, advanced processing technology and increasingly perfect management system, which not only greatly improves the crankshaft processing efficiency, realizes the flexible and rapid production change ability, but also better guarantees the crankshaft processing quality. At present, the quality of crankshafts is mainly ensured by the process control of machining and heat treatment, and there are roughly three ways:
1. Human testing: refers to the online measurement of each process by professional quality inspection personnel (or self-inspection and mutual inspection by operators) in accordance with process requirements, and timely adjustment of process parameters to prevent unqualified products from being transferred to the next process or batch rejects . 2. Equipment control: Relying on higher equipment accuracy to ensure the processing accuracy of the current process is an effective way to ensure dimensional accuracy, shape accuracy and position accuracy, and it is also one of the signs of advanced crankshaft processing production lines. 3. Process guarantee: Process is the "law of converting the crankshaft blank into finished product during machining; the criterion is the fundamental guarantee of product quality, and it is also the prerequisite for improving processing efficiency.