Method for overcoming defects of inner cavity of heat-resistant steel product
A technology of heat-resistant steel and inner cavity, which is applied in the direction of casting molding equipment, molds, cores, etc., can solve the problems of inability to produce small and small sand cores, high temperature resistance, etc., to meet the complex flow channel structure, solve erosion, high The effect of refractoriness
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Embodiment 1
[0029] A method for solving inner cavity defects of heat-resistant steel products, comprising the following steps:
[0030] S1: Core making: Check that the core box is installed correctly and in place, set core making parameters: air source pressure 0.5-0.7MPa, oil pump pressure 2.5-5.0MPa, sand injection pressure 0.5-0.7MPa, curing temperature 200-230℃, sand injection time 4-6S, curing time 180S, exhaust time 5-9S, close the core box, turn on the heating for preheating, add high temperature resistant coated sand into the core box, the high temperature resistant coated sand cannot exceed the maximum scale line, can not When the temperature reaches the curing temperature, the mold is opened, the cavity is blown clean, the mold release agent is evenly attached to the surface of the inner cavity of the core box, and the core making cycle program is started to start the core making. The fast sand core is translated by a certain distance to take out the sand core without bumping th...
Embodiment 2
[0039]This embodiment provides a high temperature resistant coated sand, which is prepared from the following raw material components in parts by weight: 100 parts of raw sand, 1 part of resin binder, 10 parts of curing agent, 5 parts of lubricant, 0.1 part of additive, chrome 29 parts of iron ore.
[0040] The content of aluminum dioxide in the high temperature resistant coated sand is greater than or equal to 48%, and the content of silicon dioxide is greater than or equal to 48%.
[0041] The resin binder is a mixture of solid thermoplastic phenolic resin and liquid thermosetting phenolic resin, and the mass ratio of solid thermoplastic phenolic resin: liquid thermosetting phenolic resin is 1:3.
[0042] The curing agent is an aqueous solution of urotropine with a mass fraction of 40% to 50%.
[0043] The lubricant is a mixture of calcium stearate and ammonium stearate, and the mass ratio of calcium stearate: ammonium stearate is 1:2.5.
[0044] The additives are polyviny...
Embodiment 3
[0052] This embodiment provides a high temperature resistant coated sand, which is prepared from the following raw material components in parts by weight: 100 parts of raw sand, 2 parts of resin binder, 11 parts of curing agent, 5.5 parts of lubricant, 1 part of additive, chromium 29 parts of iron ore.
[0053] The content of aluminum dioxide in the high temperature resistant coated sand is greater than or equal to 48%, the content of silicon dioxide is greater than or equal to 48%, and the content of ferric oxide and silicon dioxide is less than or equal to 5%.
[0054] The resin binder is a mixture of solid thermoplastic phenolic resin and liquid thermosetting phenolic resin, and the mass ratio of solid thermoplastic phenolic resin: liquid thermosetting phenolic resin is 1:3.5.
[0055] The curing agent is an aqueous solution of urotropine with a mass fraction of 40% to 50%.
[0056] The lubricant is a mixture of calcium stearate and ammonium stearate, and the mass ratio of...
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