Crankshaft forging is an important link in locomotive manufacturing, and its quality directly affects the performance and safety of locomotive. Therefore, in the process of crankshaft forging, quality control is very important. This paper will discuss the key points of quality control in the process of crankshaft forging to ensure that the forged crankshaft has excellent quality.
Material quality control is the basis of crankshaft forging quality. Ensure that the quality of the purchased raw materials meet the standards, such as chemical composition, metallographic structure, mechanical properties and other indicators to meet the design requirements. At the same time, the quality of raw materials is inspected to prevent unqualified materials from entering the production process.
During the blanking process, the flatness of the cutting surface and the accuracy of the cutting size should be ensured. Appropriate cutting tools and parameters are used to reduce cutting errors. Quality inspection shall be carried out on the blank after blanking, and timely treatment shall be made if defects are found.
Forging is the key link of crankshaft formation and an important part of quality control. In the forging process, the heating temperature, deformation, forging ratio and other process parameters should be well controlled to ensure the plastic deformation of the metal and the optimization of the internal structure. At the same time, defects such as overburning, cracking and folding should be prevented. The defects in the forging process should be dealt with in time, and the reasons should be analyzed to prevent similar defects from appearing again.
Heat treatment can improve the mechanical properties and internal structure of crankshaft. In the heat treatment process, the heating speed, holding time, cooling speed and other process parameters should be controlled to ensure that the heat treatment effect meets the design requirements. At the same time, surface defects such as oxidation and decarbonization should be prevented. The performance of the crankshaft after heat treatment is tested to ensure that it meets the design requirements.
Machining is the key to the final shape and size of the crankshaft. In the machining process, the cutting parameters, tool selection, cooling mode and other process parameters should be controlled to ensure the machining accuracy and surface quality. At the same time, the accuracy of the machine tool and tool wear should be checked regularly to prevent processing errors caused by equipment failure or tool wear. The crankshaft after machining should be inspected for size and quality to ensure that it meets the design requirements.
In the process of crankshaft forging, quality testing should be carried out regularly, such as metallographic structure testing, mechanical property testing, etc., to ensure material quality and process effect. The inspection of the finished product is the last link of crankshaft forging, and the appearance, size and performance of the crankshaft should be tested comprehensively. The unqualified crankshaft products should be handled and corrected in time, and the causes should be analyzed to prevent similar problems from appearing again. At the same time, the results of the finished product inspection should be recorded for subsequent quality traceability and improvement.
To sum up, the key points of quality control in crankshaft forging process include material quality control, blanking quality control, forging quality control, heat treatment quality control, machining quality control, quality inspection and finished product inspection. By strictly controlling these points, you can ensure that the quality of crankshaft forging is stable and reliable, and improve the quality of products and customer satisfaction. At the same time, strengthening quality management and continuous improvement is also an important way to improve the quality of crankshaft forging.
