Reasons for Poor Permeability of Coated Sand Production Equipment
Release time:
2020-12-24
Coated sand production equipment is a new type of coated sand production equipment with excellent high temperature performance and comprehensive casting performance, and the casting process of coated sand production equipment has also achieved great success and solved many problems. However, the production equipment of coated sand sometimes has poor air permeability. So what are the reasons for this phenomenon? The following small series to introduce to you.
1. type (core) surface loose core injection pressure is too high or too low, the mold exhaust is not smooth, the mold runs sand due to the large gap between the box surface, and the coated sand production equipment has poor fluidity or poor air permeability. Select reasonable sand injection pressure, improve the exhaust system, prevent suffocation, use small deformation of the material as the core box, select the liquidity and permeability of good coated sand production equipment.
2. shelling mold design is unreasonable, the core box temperature is not uniform, so that the low temperature parts of the low strength and shelling. Coated sand production equipment has low melting point, slow curing speed and low thermal strength. Improve the mold structure, so that the temperature distribution is uniform, the selection of high melting point, fast curing speed, high thermal strength of the resin.
3. casting porosity core exhaust is not smooth, resin sand gas volume or gas rate is not appropriate, sand core curing is not complete. Improve the exhaust system, improve the exhaust effect, the selection of high concentration or coarse raw sand, the use of low gas film sanding process.
The local strength of 4. through-core sand core is low or loose, and the crust thickness is thin. Improve the mold structure, make the temperature distribution uniform, select the resin with high melting point, fast curing speed and high thermal strength, adjust the sand shooting pressure and improve the exhaust system.
5. casting sticky sand original sand SiO2 content is low, the core surface is not dense. Adjust the sand injection pressure, improve the exhaust effect of the core box, make the surface of the sand core more dense, and adopt high temperature resistant coated sand production equipment or zirconium sand coated sand production equipment.
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