The main functions of lost foam casting with negative pressure casting are as follows: (1) Compact the dry sand to prevent sand washing, mold collapse and mold wall movement (box expansion). (2) The results show that the speed and quantity of exhaust gas are accelerated, the filling ability of...
Pouring temperature is a key factor affecting the quality of EPC Castings. If the pouring temperature is too high, the body shrinkage and gas content of molten metal will be increased, and the casting defects such as shrinkage cavity, shrinkage porosity and air hole will be easily caused; if...
Coating is an important part of lost foam casting process and one of the key factors affecting the filling of liquid metal. The main functions of lost foam casting coating are as follows: (1) improve the strength and rigidity of the foam model to prevent deformation or damage during...
The advantages of EPC are dry sand molding, no binder is needed, the recovery rate of dry sand is high, the production cost of enterprise is reduced, but the quality of dry sand also determines the quality of casting. The requirements of EPC for dry sand performance mainly include...
A large amount of carbon in foam materials is the “arch criminal” of the carbon defect produced by EPC cast steel. Therefore, the selection of foam materials is an important factor affecting the quality of castings. The foam materials used for EPC in the market mainly include EPS (expandable...
In addition to bearing the load from the bridge, the bridge bearing is still in the changing environment, such as the change of temperature, atmospheric corrosion and so on. This requires that the bridge bearing should also have the main cold resistance and corrosion resistance under the requirements of...
Taking the steel damping bearing as the research object, because of the complex structure of the product, the calculation of the casting modulus by dividing into soft single geometry method has a large workload and low data accuracy, and using three-dimensional engineering drawing to calculate the modulus will be...
According to the function, the riser of lost foam casting process can be divided into feeding riser, exhaust slag collecting riser and two functional risers. The feeding riser is usually set above the hot spot of the casting to realize the sequential solidification and ensure the densification of the...
At present, the design of each element size in EPC casting has not yet formed the standard of casting one. All researchers and manufacturers have been trying and revising constantly on the basis of the pouring theory design of reference sand casting. According to the section proportion of each...
According to the position of molten metal introduced into the mold, the pouring methods can be divided into top pouring, bottom pouring, side pouring (including step pouring), or the comprehensive use of several pouring methods. The advantages and disadvantages of several pouring methods are as follows. 1.Top casting Advantages:...