The quality control and testing method of forging die of construction machinery is very important to ensure product quality and safety. Several commonly used quality control and inspection methods are listed below:
- Metallographic microscope detection: The use of metallographic microscope to observe the microstructure of metal tissue can evaluate the key indicators such as grain size, phase distribution, porosity, inclusions of the forging die to judge the quality of the forging.
- Acoustic detection: through the propagation and reflection of ultrasonic waves to assess whether there are defects inside the forging, such as cracks, pores, etc. The method can quickly detect a large number of forgings, and can judge the location and size of defects with high precision.
- Magnetic particle detection: This method is suitable for detecting cracks on the surface and near the surface. By coating magnetic powder and applying external magnetic field to observe the changes of magnetic powder, cracks and defects on the surface and near the surface can be found.
- Penetration detection: By coating the surface of the forgings with penetrant, and then placing it in the oil pool, let the penetrant enter the cracks or pores. Surface cracks of forgings can be detected by observing after coating with chromogenic dye or fluorescent dye.
- X-ray detection: The use of X-rays can penetrate the material, by observing the transmission image of the material to detect the internal defects and foreign bodies of the forging. This method can check forgings of larger thickness and more complex shape.
- Pressure test: By placing the forgings under a certain pressure to test and observe whether there is leakage, deformation or rupture to evaluate the tightness and strength of the forgings.
These methods can comprehensively and accurately evaluate the quality and defects of the forging die of construction machinery, and help to guide and improve the manufacturing process, improve the quality level and service life of the die. It is necessary to choose the appropriate method for quality control and inspection according to the specific situation.
