An aluminium‑casting process works as follows. Pure aluminium or aluminium‑alloy ingots are blended in compliance with standard composition ratios. The mixture is artificially heated into molten aluminium alloy. The molten metal is poured into mould cavities via dedicated moulds or corresponding procedures and cooled to obtain aluminium workpieces of target shapes. Common aluminium casting processes include sand casting, die casting, low‑pressure casting, investment casting, permanent‑mould casting and lost‑foam casting.
Aluminium castings boast desirable mechanical and physical properties. They achieve combined performance with adjustable strength, hardness and toughness, alongside one or more specialised attributes such as wear‑resistance, high‑ and low‑temperature resistance and corrosion resistance.
Aluminium castings accommodate an extensive range of weights and casting dimensions. The lightest pieces weigh merely several grams while the heaviest can hit 400 tons. Wall thickness ranges from a minimum of 1 millimetre to over 1 metre, and component length spans several millimetres to more than ten metres, meeting the demands of diverse industrial sectors. For surface‑quality inspection, surface roughness is assessed against comparison specimens. Tiny surface cracks are detected through dye‑penetrant testing or magnetic‑particle inspection. Internal defects are examined and identified by means of acoustic, ultrasonic, eddy‑current, X‑ray and gamma‑ray testing.
The quality of aluminium castings greatly impacts the performance of machinery products. To illustrate, the wear resistance and dimensional stability of machine‑tool aluminium castings directly determine the service life of machine‑tool precision retention. The dimensional accuracy, profile precision and surface finish of pump impellers, housings and hydraulic‑component inner cavities directly influence pump‑and‑hydraulic‑system operating efficiency, energy consumption and cavitation progression. Furthermore, the strength and thermal‑shock resistance of aluminium castings including engine blocks, cylinder heads, cylinder liners, piston rings and exhaust manifolds exert a direct effect on engine service life.