Molding sand preparation method for casting 350-kilometer axle boxes
A molding sand and axle box technology, which is applied to casting molding equipment, molds, and mold components, can solve the problems of 350km axle box production non-compliance, long production cycle, and environmental pollution, so as to promote hardening efficiency and improve product quality , the effect of reducing production costs
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Embodiment 1
[0040] A preparation method for casting 350km axlebox with molding sand, comprising the steps:
[0041] 1. Molding sand ratio: 100% (mass) of quartz sand, binder, and inorganic hardening accelerator. The binder is composed of phenolic resin and powdery coupling agent, wherein the amount of phenolic resin added is 2.2% of the sand mass. %, the addition of powdery coupling agent (vinyltrimethoxysilane) is 24% of the sand quality; the density of the phenolic resin is 1.30g / cm 3 , viscosity is 280mps.s, free phenol≤1%, free aldehyde≤0.2%; the density of the coupling agent is 2.4g / cm 3 ; The inorganic hardening accelerator is composed of clay and bentonite with a mass ratio of 1.2:1, and the added amount of the inorganic hardening accelerator is 3.9% of the quality of the quartz sand.
[0042] 2. Sand mixing: the specific steps are as follows:
[0043] ① Add quartz sand, add water with 12% of the quality of quartz sand: start the scraper motor, stir for 20 laps and stop;
[0044...
Embodiment 2
[0055] A preparation method for casting 350km axlebox with molding sand, comprising the steps:
[0056] 1. Molding sand ratio: quartz sand 100% (mass), binder, the binder is composed of phenolic resin and powdery coupling agent, wherein, the amount of phenolic resin added is 2.5% of the sand mass, powdery coupling agent The addition amount of joint agent (vinyl tri(β-methoxyethoxy)silane) is 50% of the sand quality; the density of the phenolic resin is 1.40g / cm 3 , viscosity is 200mps.s, free phenol≤1%, free aldehyde≤0.2%; the density of the coupling agent is 2.7g / cm 3 ; The inorganic hardening accelerator is composed of clay and bentonite with a mass ratio of 0.8:1, and the added amount of the inorganic hardening accelerator is 4.6% of the quality of the quartz sand.
[0057] 2. Sand mixing: the specific steps are as follows:
[0058] ① Add quartz sand, add water with 14% of the quality of quartz sand: start the scraper motor, stir for 32 laps and stop;
[0059] ② Add bind...
Embodiment 3
[0070] A preparation method for casting 350km axlebox with molding sand, comprising the steps:
[0071] 1. Molding sand ratio: quartz sand 100% (mass), binder, the binder is composed of phenolic resin and powdery coupling agent, wherein, the amount of phenolic resin added is 1.6% of the sand mass, powdery coupling agent The addition amount of coupling agent (vinyl triethoxysilane) is 10% of sand quality; The density of described phenolic resin is 1.34g / cm 3 , viscosity is 300mps.s, free phenol≤1%, free aldehyde≤0.2%; the density of the coupling agent is 2.4g / cm 3 ; The inorganic hardening accelerator is composed of clay and bentonite with a mass ratio of 2:1, and the added amount of the inorganic hardening accelerator is 3.5% of the quality of the quartz sand.
[0072] 2. Sand mixing: the specific steps are as follows:
[0073] ① Add quartz sand, add water with 10% of the quality of quartz sand: start the scraper motor, stir for 30 laps and stop;
[0074] ② Add binder and i...
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