Solving method of casting shrinkage defects, the most fundamental starting point is the "thermal equilibrium." The method is: the thickest section of the dock and hot bucket wheel guard device (1) in the machine casting structure formation, the implementation of rapid solidification port wheel guard Hom equipment, machine tool castings artificially basic balance throughout the temperature field. Inside and outside the cold iron, the local use of heat storage capacity of zircon sand, chromite sand or special coatings. (2) a reasonable process design. Runner in the machine tool castings Pu wall opposite, and scattered more hours. So early into the thick of the lead solidified molten metal, solidified thin wall, so throughout basic equilibrium solidification. Casting machine for uniform wall thickness, using a plurality of inner runner and vents. Runner and more dispersed and uniform, so that the overall heat balance. And many fine pores, ie unobstructed exhaust cooling effect was underway. (3) changes in the position of the runner (4) selection of heat storage capacity of the molding material, which is the production of anti-wear products with the EPC is extremely important! Chromite sand quartz sand to replace the heat build small sand other species, will achieve good results bucket wheel guard equipment manufacturers, pouring Bi microseismic better! Casting defects: cold resisting grain Other names: Splice (butt), waterlines. Features: low temperature metal flow mutual butt fusion but the emergence of the gap, irregular linear, non-penetrating and penetrating two bucket wheel guard equipment, in the role of external forces have trend. Reason: a molten metal pouring temperature is low or the mold temperature is low. 2, alloy composition does not meet the standards, poor mobility. 3, sub-unit filled with liquid metal, fusion is bad. 4, gate unreasonable process is too long. 5, filling speed is low or poor venting. 6, lower than the pressure. Port wheel guard Hum Hum wheel retaining device _ _ Chen Hua mechanical equipment supplied by China Machinery Equipment Co., Ltd. Qingdao Chen. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) strong, credible, in Qingdao, Shandong CNC machine tool industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chen Hua machinery and you hand into the brilliant, for a better future!