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Control the deformation of lost foam casting technology measures

Out-pressure in the second when the EPS foam particles with high water content in dry (ie, aging) time is short or curing temperature is low ( 0.02MPa; original vacuum can be slightly higher (> O.035 ~ 0.05MPa). ③ the release of the vacuum pump stops,[link widoczny dla zalogowanych], so that freedom of casting contraction in order to reduce the casting stress. Pumping too early, the casting surface has not completely solidified, Results shell low intensity, likely to cause casting distortion, affecting the dimensional accuracy of castings; stop the pump too late. As the intensity of the vacuum Real than ordinary sand mold high casting shrinkage prone to hot cracking. This requires the structure according to casting, pouring temperature, casting size and wall thickness to choose. 5min or so the general principle (in wall size), wall thickness> 20mm, weighing more than 100kg, the pump stops 5min after pouring; 100 The following casting, casting can be stopped after the release of the vacuum pump. 100kg or more of the thick (> 3Omm) vacuum casting time may be extended to speed up the cooling rate; and thin-walled tube type, cast the end of the release of the vacuum pump can be stopped. 4 Conclusion for the circumstances. Have a choice to take over technical measures, strict implementation of the disciplinary process, refine practices, the casting has not only been controlled deformation. Accuracy and can make the size CT10 above. Gluttonous soul pound large section ductile iron-based optimization of process measures to ductile iron casting wall thickness greater than 50mm, a large cross section is known as ductile iron. Solidification of large section ductile iron because of the slow decline of globalization apt, dark spots, shrinkage and other defects seriously affect the strength and ductility (elongation), the process must take the necessary measures: 1. With the right amount of ytirium composite ball for ball processing agent. 2. Adding antimony, bismuth and other trace elements (Ti) 0.01%, w (Bi) 0.01% 1, use of forced cooling, solidification process measures. 3. Heavy Section Ductile Iron to improve the residual rare earth, magnesium content [w (RE) 0.06%,[link widoczny dla zalogowanych], w (Mg) 0.065%]. 4. Using instantaneous birth,[link widoczny dla zalogowanych], multiple birth measures to strengthen the inoculation. I am using the above measures. Various types have been successfully casting a large section ductile iron fittings,[link widoczny dla zalogowanych], such as the cross-section of 805mm ductile iron roll and so on. (Penglai City, Shandong Province Casting Co., Ltd. III and Annette as) 2007 / l Modern Cast Iron f77

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