The mechanical valve body is inspected after casting and forming.
One, Introduction
The mechanical valve body is a common key component in the industrial automation system, and its quality is directly related to the stability and safety of the entire system. During the casting process, the integrity of the internal structure, surface quality, dimensional accuracy, and internal defects of the valve body may affect its performance. Therefore, after the casting of the valve body, it must be subjected to non-destructive testing to ensure that it meets the design and use requirements. This article will discuss in detail the importance and methods of non-destructive testing after the casting of the mechanical valve body.
Two, The importance of non-destructive testing after the casting of the valve body
After the casting of the valve body, there may be defects such as pores, shrinkage cavities, inclusions, cracks, and sand holes inside. If these defects are not discovered and handled in time, they will seriously affect the performance and service life of the valve body. Therefore, non-destructive testing is an important link to ensure the quality of the valve body. Through non-destructive testing, defects can be detected and handled in time, improving the reliability of the product, reducing failures and accidents caused by quality problems, and ensuring the safe operation of industrial production.
Three, Non-destructive testing methods
The methods of non-destructive testing mainly include non-destructive testing and destructive testing. Non-destructive testing methods mainly include radiographic testing, ultrasonic testing, magnetic particle testing, and penetrant testing, which can detect internal defects without damaging the object being tested, with advantages such as simple operation, fast speed, and low cost. Destructive testing methods mainly include metallographic examination and hardness testing, which can detect internal defects of the valve body, but require the destruction of the object being tested, and therefore have a relatively high cost.
Radiographic testing: Utilizing radiation to scan the internal structure of the valve body, and judging the position and size of internal defects according to the intensity difference of the radiation absorbed during the penetration process. Radiographic testing technology can detect defects such as pores, inclusions, and cracks, but it has a greater impact on the pollution and damage of the valve body surface, and the detection cost is relatively high.
Ultrasonic testing: Utilizing the propagation characteristics of ultrasound in the medium to detect internal defects of the valve body. Ultrasonic testing technology can detect defects such as pores, inclusions, and cracks, and has little impact on the pollution and damage of the valve body surface, with a relatively low detection cost.
Magnetic particle testing: Utilizing the adsorption characteristics of magnetic particles in the magnetic field to detect surface and near-surface defects of the valve body. Magnetic particle testing technology can detect cracks, inclusions, and other defects, but it has a greater impact on the pollution and damage of the valve body surface, and the detection cost is relatively high.
Penetrant testing: Utilizing the aggregation characteristics of the penetrant at the defect location to detect surface defects of the valve body. Penetrant testing technology can detect cracks, inclusions, and other defects, but it has a greater impact on the pollution and damage of the valve body surface, and the detection cost is relatively high.
Four, Conclusion
The non-destructive testing of the mechanical valve body after casting is an important link to ensure the quality of the valve body and improve the quality of the product. Through non-destructive testing and destructive testing, internal defects of the valve body can be detected and handled in time, improving the reliability of the product, reducing failures and accidents caused by quality problems, and ensuring the safe operation of industrial production. Therefore, it is necessary to pay attention to the non-destructive testing after the casting of the valve body, to ensure the quality and performance of the valve body, and meet the design and use requirements.