As an important part of locomotive, the quality of main and auxiliary connecting rod forging directly affects the performance and safety of locomotive. Quality inspection and control is the key link to ensure the quality of forging. This paper will discuss the quality inspection and control method of main and auxiliary connecting rod forging.
Quality inspection is an important means to ensure the quality of the main and auxiliary connecting rod forging. The main testing items include:
Dimensional inspection: The size of the forging is accurately measured by the measuring tool to ensure that it meets the design requirements. For critical dimensions, 100% inspection should be carried out, other dimensions can be random inspection.
Appearance inspection: Check whether there are cracks, pores, inclusions and other defects on the surface of the forging. Initial inspection is carried out by visual inspection, magnifying glass or low power microscope, and the suspected defect area can be further confirmed by non-destructive testing method.
Mechanical properties testing: According to the material and process requirements, tensile, impact, hardness and other mechanical properties of the forgings are tested to ensure that they meet the design requirements.
Non-destructive testing: The use of ultrasonic, ray, magnetic powder and other non-destructive testing methods for forging internal defects detection to ensure its internal quality.
Quality control is a necessary measure to ensure the quality of the forging of the main and auxiliary connecting rod. The main control links include:
Raw material control: Select raw materials with stable quality and excellent performance, and conduct incoming inspection to ensure that the quality of raw materials meets the requirements.
Process control: Develop a reasonable forging process and strictly implement it in the production process. Monitor and record key process parameters to ensure process stability and reliability.
Equipment and tooling control: Regular inspection, maintenance and maintenance of production equipment and tooling to ensure that they are in good condition. For critical equipment and tooling, regular calibration or verification should be carried out to ensure its accuracy and reliability.
Environmental control: Keep the production environment clean, dry and dust-free to meet the production requirements. For processes with special environmental requirements, corresponding environmental control measures should be taken.
Personnel training and assessment: Regular training and assessment of operators to improve their skill level and work responsibility. For personnel in key positions, professional training and qualification certification should be conducted.
Quality management system: Establish a sound quality management system, and clarify the quality responsibilities and authority of each position. Quality objective, quality plan, quality inspection and other means to ensure the stability and reliability of forging quality.
Nonconforming product treatment: traceability and treatment of nonconforming products, analysis of causes and take corrective actions. At the same time, the establishment of nonconforming product files, in order to track and manage nonconforming products.
Continuous improvement: Regularly review and improve the quality management system, and constantly improve and optimize the quality control measures according to the actual production situation and customer needs.
In this paper, the quality inspection and control methods of main and auxiliary connecting rod forging are deeply discussed, and the following conclusions and suggestions are drawn:
Strengthen quality awareness: ensure that all employees fully understand the importance of quality and cultivate the awareness of quality first.
Improve testing equipment: invest necessary quality testing equipment and tools to improve testing efficiency and accuracy.
Strict control of key process parameters: Key process parameters should be monitored and recorded in real time to ensure their stability and reliability. At the same time, strengthen the inspection and assessment of process discipline.
