Common inspection methods for mechanical parts

In the production process of mechanical parts, quality inspection is a very critical step. Because mechanical parts are the most basic part of mechanical equipment, if its quality cannot be guaranteed, it will lead to quality and safety hazards for the entire mechanical equipment. Therefore, we need to do a good job in the inspection of mechanical parts. The following are several inspection methods for mechanical parts to provide reference for those who are new to the machinery industry.

Sensory inspection method: This method mainly relies on the vision, hearing and touch of quality inspection personnel to distinguish the qualification of mechanical parts. Mechanical parts with macro defects or flaws in appearance can be found through vision. By knocking on the parts and listening to the sound made by the parts, you can detect whether the parts are internally defective or the overall quality is qualified. By touching the surface of the parts, you can feel the flaws on the parts surface and the heating during operation. You can also shake the parts to understand the stability of the installation. However, this method cannot be used for the inspection of high-precision parts, and since it relies entirely on the judgment of the inspector, it has relatively high requirements on the physical and mental state, experience quality, working environment and other factors of the inspector that will affect the inspection results.

仪器、工具检查法：通过仪器、工具检测机械零件的精度、质量，由于工具、仪器的原理各不相同，可以分为通用量具、专用量具、机械式仪器和仪表、光学仪器、电子仪器等。Wulian has very professional technical testing personnel, as well as direct-reading spectrometer, twisting force tester, projector, image screening machine, image measuring instrument, fluorescence thickness gauge, salt spray testing machine, spring tension and compression testing machine, etc. A variety of large-scale precision instruments can detect the accuracy, hardness, strength, coating, corrosion protection and other aspects of Wulian products.

物理检查法：这种方法通常会和仪器、工具检查法相结合，通过收集由工件引起的光、电、磁、声、热等物理量变化的数据检测零件的合格情况。Among the physical inspection methods, the more special one is non-destructive testing. Non-destructive testing can ensure that the interior or surface of the mechanical parts can be inspected without being damaged. The testing content mainly includes various mechanical and physical properties of the surface of the mechanical parts and parts defects. At present, there are five common non-destructive testing methods: radiation testing, ultrasonic testing, magnetic particle testing, liquid penetrant testing and eddy current testing.

技术支持：郭洪华

编辑：刘康利