At present, with the development of marine engine to large-scale, the demand for large cylinder diameter, large tonnage and high-performance engine castings is increasing. In order to meet the market demand for high-performance engines, our factory, as the production base of high-end Large Engine Castings, has also carried out...
(1) The graphite morphology of the three grades of gray cast iron samples is mainly type A, with a small amount of type D and e graphite. In terms of graphite grade, ordinary HT250 graphite is mixed with grade I and grade II, and low alloy HT250 and HT300...
(1) The fatigue life curve of ordinary HT250 is shown in Figure 1. (2) The fatigue life curve of low alloy HT250 is shown in Figure 2. (3) The fatigue life curve of HT300 is shown in Figure 3 -. It can be seen from Fig. 1, Fig. 2...
The gray cast iron cylinder body adopts the traditional horizontal pouring process, the sand core is dipped with coating respectively and then assembled together, and the coating type can be selected according to different conditions. In the pouring process, different cores are subject to different degrees of conduction, convection...
The casting coating is composed of five basic components: refractory aggregate, carrier, binder, suspending agent and additives. With the development of technology, the casting coating has expanded from single sand prevention to multiple functions such as anti veining, sintering, porosity, leakage and sand hole, so as to meet the...
The strength of gray cast iron is mainly determined by graphite shape, size, pearlite in matrix and ferrite proportion. With the increase of exhaust temperature of the engine, the grey cast iron with high carbon equivalent can not meet the requirements of application because the oxide film will form...
The traditional method of high strength gray iron is to reduce the eutectic degree, to increase the austenite content and the branching of austenite dendrite, and to reduce the amount of graphite. However, the increase in strength is at the expense of casting properties. The low eutectic degree reduces...
The mass fraction of carbon in iron is higher than 2%, while that of silicon is between 1% and 3%. Cast iron is widely used in industry because of its low cost, easy pouring, low notch sensitivity, good wear resistance and shock absorption, and corrosion resistance to some media....
In order to adjust the sand temperature, the air temperature must be considered. Although the curing reaction of resin sand is exothermic, the air temperature directly affects the sand temperature. If the temperature is below 10 ℃ or above 30 ℃, it may have a negative effect on the...
Furan resin can be divided into urea formaldehyde furan resin, phenol urea formaldehyde furan resin, formaldehyde sugar alcohol resin and high sugar alcohol resin. The price of UF resin is low, because of its high nitrogen content (5% – 11%). Although the strength of resin sand is high, the...