Experimental investigation on chilled cast iron tappet manufacturing processes parameters
TL;DR: In this article, the influence of inoculation, pouring temperature, coating thickness and chill plate on chilled depth was investigated, and an optimal set of casting parameters were generated to obtain a satisfactory chilled depth.
Abstract: Chilled cast iron tappet has a tendency microstructure of white, mottled and gray iron. The exact composition and other casting parameters, like pouring temperature, inoculation and coating, need to be determined for achieving the desired thickness of the chilled layer. Chilled cast iron finds applications in areas where improved hardness and wear resistance are required. Mottled cast iron has very poor machinability and high brittleness due to the presence of secondary cementite. These constitute the limitations for its use. The influence of inoculation, pouring temperature, coating thickness and chill plate on chilled depth was investigated. Taguchi design-of-experiments (DOE) are used for generating an optimal set of casting parameters to obtain a satisfactory chilled depth. Analysis of the effects of all the parameters on chilled depth has been carried out through a microstructure study.
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TL;DR: In this article, the effect of tellurium (Te) on the chilled cast iron tappet microstructure was investigated, which comprises three gradient microstructures, including chill, mottle, and gray iron.
Abstract: The chilled cast iron tappet comprises three gradient microstructures, including chill, mottle, and gray iron. In this work, the effect of Tellurium (Te) on the chilled iron tappet’s microstructure...
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TL;DR: In this article, the influence of melt and die temperatures on the squeeze cast silicon carbide particulate reinforced aluminum alloy composites was investigated. But the results revealed significant influence of both melt and dies on the mechanical properties.
Abstract: The paper deals with the influence of melt and die temperatures on the squeeze cast silicon carbide particulate reinforced aluminum alloy composites. Samples were produced at the following constant melt and die temperatures: melt—750, 800, 850, and 900°C; die—250, 300, 350, and 400°C. During the specimen fabrication, pressure was maintained at 100 MPa. The results reveal significant influence of both melt and die temperatures on the mechanical properties. The optimum melt and die temperatures for the preparation of the composite are 850°C and 350 °C, respectively. Tensile and impact strengths, and hardness of composite samples prepared at this temperature combination are found to be better than those of samples prepared at other temperatures. Additionally, microstructures of samples prepared at this temperature combination display a relatively fine grain structure and the smallest degree of particle agglomeration which explain the dependence of mechanical properties on the melt and die temperatures.
65 citations
"Experimental investigation on chill..." refers background in this paper
...Pouring temperature and mold temperature are also major factors that explain the mechanical and microstructure properties [3, 4]....
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01 Jul 1999
TL;DR: In this article, the effect of chill thickness on the inner surface temperature of the cast iron chill was investigated and the results showed that after filling the castings, the effect was minimal after filling.
Abstract: Abstract Heat transfer at the metal/chill interface during solidification of commercially pure aluminium square bar castings with cast iron chill at one end was investigated. Experiments were carried out for different chill thicknesses and superheats. The inner surface temperature of the chill initially was found to increase at a faster rate for higher superheats. The effect of chill thickness on the inner surface temperature of the chill was observed only after the heat from the solidifying casting had sufficient time to diffuse to the interior of the chill material. Inverse analysis of the non-linear one-dimensional Fourier heat conduction equation indicated the occurrence of peak heat flux at the end of filling of the mould. The effect of superheat on heat flux was minimal after filling. However, the effect of chill thickness had a significant effect on the heat flux after the occurrence of peak heat flux. Higher heat flux transients were estimated for castings poured at higher superheats. The corresponding heat transfer coefficients were also estimated and reported. The heat flux model presented in this work can be used for determination of casting/chill interfacial heat flux as a function of chill thickness and superheat. These heat flux transients could be used as boundary conditions during numerical simulation of solidification of the casting.
53 citations
"Experimental investigation on chill..." refers background in this paper
...near the tip and along the axial direction of the wedge [2]....
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...Cooling rate varies near the edge and along the axial direction of the wedge [2]....
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...Resistance obtained from casting or chill boundary is a vital factor that influences heat transfer from solidifying casting to the chills [2]....
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TL;DR: In this paper, the effect of chill thickness on the inner surface temperature of the cast iron chill was investigated and the results showed that after filling the castings, the inner temperature increased at a faster rate for higher superheats.
47 citations
TL;DR: In this paper, the effect of cooling rate on the dendrite arm spacing, eutectic cell count and the ultimate tensile strength was evaluated and the results obtained and the deductions made from a series of microstructural studies and strength tests involving austempered chilled ductile iron which was sand cast using a variety of end chills.
35 citations
"Experimental investigation on chill..." refers background in this paper
...In addition, the increase in tensile strength is related to the grain structure that improves, due to the chill plate [10]....
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TL;DR: In this article, the model of the hydropuls mechanism of drill machines is presented, and the differential equations featuring mechanical and hydraulic processes for all cycle are given, including all cycles.
Abstract: The model of the hydropuls mechanism of drill machines is presented. The differential equations featuring mechanical and hydraulic processes for all cycle are given.
21 citations
"Experimental investigation on chill..." refers background in this paper
...A portion of the foundry coatings contain natural binders, which discharge gases after burning, resulting in the creation of pinholes on the surface [13]....
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