Investment casting method for duplex overall-cast directional-solidified turbine guide blades
A technology of turbine guide vanes and investment casting, which is applied in casting molding equipment, casting molds, casting mold components, etc., to achieve the effect of large relative distance of seeding structure, favorable drying consistency and uniformity, and avoiding metallurgical defects
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Embodiment 1
[0025] When preparing the ceramic core, first press and sinter a ceramic core with a shape consistent with the ceramic core, with a circumferential dimension smaller than the ceramic core's design size by 0.5mm, then pre-place it in the core mold, and press the outer shell on the outside of the cold core , After sintering, a complete ceramic core is formed; the material of the cold core is the same as the ceramic slurry used to prepare the ceramic core shell;
[0026] After the completion of the ceramic core system, the blade wax mold is pressed. The feeding bending piece 6 is a wedge block with a length of 30mm, a height of 10mm, and a thickness of 1mm to 3mm;
[0027] The thickness of the core head of the seeding section 3 is 0.5~2mm;
[0028] Exhaust side wax sheet 8 has a width of 5mm and a thickness of 3mm;
[0029] The blade body 9, the inner edge plate 10 and the outer edge plate 11 in the blade wax mold are formed by integral injection molding. The injection temperature is 63~...
Embodiment 2
[0035] Compared with Example 1, this embodiment differs as follows:
[0036] The size of the cold core is 2mm smaller than the one side of the core;
[0037] The feed bending piece (6) is a wedge block with a length of 20mm, a height of 15mm, and a thickness of 2mm to 4mm;
[0038] Exhaust side wax sheet (8) has a width of 3mm and a thickness of 2mm;
[0039] The number of coating layers for the shell is 8;
[0040] The melting and casting equipment is a vacuum induction directional solidification furnace. After the shell reaches the temperature, it is held for 30 minutes. The IC10 alloy is selected for refining at 1535°C. Then the upper heater temperature is controlled at 1480°C, the lower heater temperature is 1490°C, and the casting temperature is 1480°C. The pulling rate is 8mm / min.
[0041] After the casting is out of the furnace, the shell is cleaned with high-pressure water, and the runner is removed and corroded in an aqueous solution of ferric chloride and hydrochloric acid. Th...
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