heat treatment process fluid coupling impeller

Fluid coupling impeller heat treatment process , characterized by the following steps:First step. Large diameter cast aluminum impeller hydraulic coupling before heat treatment to prepare a. Casting before the heat treatment must be clean, free of oil and non-corrosive substances , does not allow distortion, cracks, blisters , sand and other macro defects ; b. Heating with automatic temperature control with fan cycling solid melting furnace, temperature control at 350 ℃ or less , solid melting furnace should wind circle , to ensure unobstructed air path, so that a substantially uniform  Hydraulic ferrules heating conditions ;The second step. Solution treatment a. The large diameter cast aluminum impeller into the fluid coupling of solid melting below 350 ℃ solution treatment furnace and the furnace heating step , the heat treatment temperature of 530 ℃ -540 ℃, heat 4-9 hours ; b . Then 60 ~ 100 ℃ water cooling ;The third step. Large diameter cast aluminum impeller thermal hydraulic couplingaging treatment on large diameter cast aluminum impeller hydraulic coupling solution heat treatment after quenching stand at room temperature 96 hours -110 hours natural aging process ;The fourth step . Visual inspection : Casting allowed to have cracks , bubbles, corrosion and deformation obvious defects such as furnace into the same hardness test blocks and tensile test bars for mechanical performance test ;The fifth step . If you re- heat treatment of aluminum alloy castings large diameter cast aluminum impeller due to fluid coupling hardness, tensile strength , elongation unqualified, or deformed super- Chake repeated heat treatment, repeated re-submitted after the heat treatment , heat treatment is generally not more than two repeated , third after the heat treatment , is still unsatisfactory , casting scrap