In the process of locomotive manufacturing, the quality inspection and evaluation of crankshaft forgings is a very important link. The quality of crankshaft forging is directly related to the performance, safety and service life of the locomotive. Therefore, it is very important to adopt scientific and effective quality inspection and evaluation methods to ensure the quality of crankshaft forgings. This paper will deeply discuss the quality inspection and evaluation methods of locomotive crankshaft forgings.
Quality detection method
Appearance inspection: Check the appearance of crankshaft forgings by visual or low-power microscope to check whether there are obvious defects such as cracks, pores, inclusions.
Size inspection: Use measuring tools to accurately measure the dimensions of the crankshaft forgings to ensure that they meet the design requirements.
Hardness testing: The hardness of crankshaft forgings is measured by a hardness meter to ensure that it meets the process requirements and conditions of use.
Metallographic structure detection: The metallographic structure of crankshaft forgings is observed by metallographic microscope to evaluate its metallurgical quality and heat treatment effect.
Non-destructive testing: The use of ultrasonic, ray, magnetic powder and other non-destructive testing technology to detect the internal defects and damage of crankshaft forgings.
Quality evaluation index
Metallurgical quality: Evaluate the purity of metal materials, carbide distribution, microstructure, etc., to judge its metallurgical quality.
Mechanical properties: Through tensile, impact, fatigue and other tests, test the mechanical properties of crankshaft forgings, such as tensile strength, yield strength, fatigue life, etc.
Surface integrity: Evaluate the roughness of the crankshaft forging surface, the uniformity of hardening, and the presence of surface damage.
Dimensional accuracy: Evaluate the actual dimensions of the crankshaft forgings in accordance with the design dimensions.
Non-destructive testing evaluation: According to the results of non-destructive testing, determine whether there are cracks, pores, inclusions and other defects inside the crankshaft forgings.
Quality assessment process
Develop evaluation standards: According to relevant standards and customer requirements, develop quality evaluation standards for crankshaft forgings.
Sampling and preparation: According to the evaluation needs, a representative sample is taken from the production batch and the necessary preparation is carried out.
Testing and testing: According to the established testing and testing methods, the sample quality testing and testing.
Result analysis and evaluation: According to the test and test results, the data analysis and evaluation are carried out to judge the quality level of crankshaft forging.
Issue reports and feedback: Write quality assessment reports, feedback results to relevant departments and customers, and make improvement suggestions.
Quality inspection and evaluation is an important means to ensure the quality of locomotive crankshaft forging. Using scientific methods and standards, the crankshaft forgings can be tested and evaluated comprehensively, which can effectively control its quality level and improve the reliability and safety of products. At the same time, continuous optimization of quality testing and evaluation processes, improve the accuracy and reliability of testing and testing, help enterprises to continuously improve product quality and market competitiveness.
