How do I know if Dongguan precision castings are qualified?

Dongguan Precision CastingInspection of surface and near-surface problems, liquid penetration inspection is used to detect various opening defects on the surface of Dongguan precision castings, such as surface cracks, surface pinholes and other defects that cannot be detected by the human eye.

The penetrating inspection commonly used in foundries is the coloring inspection, which involves the penetration of high-permeability colored (usually red) liquid (infiltrated body) into the surface of the casting, and the infiltrated body penetrates into the opening defect. Called display) spread to the surface of the casting, residual opening defects, the accuracy of the penetration inspection decreases with the decrease of the surface roughness of the inspected material. In other words, the more the surface emits light, the better the inspection effect. The inspection accuracy of the surface polished by the grinder is the highest, and intergranular cracks can be detected. In addition to chromaticity detection, fluorescence penetrant detection is also a commonly used liquid detection method, which needs to be equipped with ultraviolet radiation for radiation observation, and the detection sensitivity is higher than that of color detection.

For example, the wear resistance and specification reliability of machine tool castings immediately endanger the accuracy of the service life of the machine tool; the accuracy and roughness of the specifications, inner walls, and contour lines of each pump's centrifugal impeller, casing and hydraulic parts immediately endanger the pump casing and High efficiency, energy consumption and cavitation of hydraulic transmission system; compressive strength and temperature resistance of engine block, cylinder head, cylinder liner, engine piston, exhaust pipe, etc.