The intrinsic quality of Dongguan precision casting products mainly includes chemical composition, metallographic structure, metallurgical defects, physical and mechanical properties, reliability, grain size (eutectic number), eutectic saturation, compactness, purity, continuity, etc.
These inherent qualities will affect the quality of use, such as cutting performance, welding performance, running performance, wear resistance, corrosion resistance, temperature resistance, working life and other working conditions. , And their indicators are constantly improving.
1. Direct-reading spectrometer for detecting the composition of molten iron in front of the furnace: Analyze and study harmful trace elements-especially the gaseous elements N, 0, h.
2. Dongguan precision casting raw material quality inspection.
The x-ray fluorescence spectrometer can complete the complete analysis of various raw materials such as ferroalloys, desulfurizers, slags, refractory materials, and minerals used as nodulizers and inoculants within 5 minutes.
The portable "alloy analyzer" can complete the testing of various black and non-ferrous alloy raw materials in the material warehouse and workshop site within 5 minutes.
3. Metallographic structure and mechanical performance test.
Automatic intelligent metallographic organization of metallographic analyzer: quantitative and qualitative analysis;
Use "universal material testing machine" and "electronic tensile testing machine" to intelligently analyze mechanical properties;
4. Non-destructive testing of precision castings.
Commonly used equipment includes magnetic particle testing, radiographic testing, ultrasonic testing or spheroidization testing, hardness and matrix testing, wall thickness testing, water (gas) pressure testing, etc. , Including "online automatic inspection" and "online automatic sorting" complete sets of equipment.
Due to the influence of factors such as poor surface finish, loose material, coarse grains, graphite and other factors of the cast iron blanks of Dongguan precision castings, it is necessary to pay attention to the selection of flaw detection methods, the selection of instruments, the matching of equipment, the operation technology and the experience of personnel.
5. Surface quality inspection of precision castings.
The inspection of surface defects of precision castings in Guangdong generally relies on visual inspection, including the use of less than ten times magnifying glass and modern industrial endoscopes. In order to improve the resolution, fluorescent penetrant inspection, color inspection, magnetic particle inspection and other methods can be used to find defects on or near the surface.
7. Furnace gas analysis and detection.
Generally used: gas chromatograph, infrared gas analyzer, etc. In particular, the gas chromatograph can not only analyze the furnace gas, but also analyze the content of nitrogen, oxygen, and hydrogen in cast iron.
8. Thermal analysis and testing in front of the furnace.
"Thermal analysis" can not only quickly predict the spheroidization rate, but also detect the content of carbon and silicon, the inoculation effect, the matrix structure and the mechanical properties of cast iron. However, due to the influence of many factors such as the accuracy of thermocouple materials in my country, the accuracy of thermal analysis is not satisfactory.