Resin sand production of thin-walled, the shape of complex steel castings

Web Design And Seo For www.china-webdesign.com

casting plant - China Manufacturer

Thank you for inquiry my casting plant, Tel:0086-574-27851019 E-MAIL:thomas@steel-casting-forging.com

http://www.steel-casting-forging.com/key-casting-plant-45/

, the most prone to a defect in the thermal cracking.

There are three reasons:
investment casting china
A resin s and mobility, easy and compact; a small amount of resin, thin binder film coated on the sand, so sand the thermal expansion of the sand core, sand the thermal expansion rate than the sodium silicate sand core (type) high.
valve castings
2, after the heat of the resin sand, resin carbonized coke in the reducing atmosphere and the formation of hard coke skeleton can improve the hot strength of the sand core (such as 1000 ℃, the compressive strength of resin sand, sodium silicate sand 10 times) a serious impediment to the concession of the sand core (type). furan resin, furfuryl alcohol content the higher (the lower the nitrogen content), the greater the thermal cracking tendency of the casting, furfuryl alcohol to improve the thermal decomposition temperature of the resin, reducing the rate of thermal decomposition of the resin, thereby reducing the collapsibility of sand or sand core, sand mold or sand core is more to hinder the casting shrinkage, resulting in casting hot tearing tendency to increase the range of liquid-solid two-phase zone wide cast steel solidification, furan resin sand cast steel more susceptible to hot crack, especially in the framework structure.
Undercarriage track frames
3, furan resin sand, using p-toluenesulfonic acid as a catalyst to increase sulfur, and thus increase the tendency of hot cracking.
lost wax castings
By the sand core (type) greater resistance of the resulting shrinkage during solidification of high temperature metal casting stress and deformation, while the alloy surface increased sulfur and reduce thermal cracking. When the stress or deformation exceed the ultimate strength of the alloy in the temperature or deformation, the formation of thermal crack ing. In order to make the sand, in particular furan resin sand to avoid or minimize thermal cracking can take the following measures:
steel casting foundry