Numerical Simulation On The Cooling Capacity Of Partial Mould Under Natural Condition

It's easy to lead to hot spot at the local of casting because of the difference in the wall thickness of casting. Series of problems result from the casting hot spot, such as the unbalance of casting temperature field, disordered solidifying and causing casting defect easily. At the same time, the hot spot disorder the mould temperature field and this contributes to the thermal fatigue of mould. The hot spot is a major factor which may lower the natural life and degrade casting dimensional precision of mould. Therefore the eliminating of hot pot has become one of the most important issue during the course of casting technics designing, and the key to solve the problem is the fix quantify research on the effected factors of hot pot.Because the casting heat-transfer process is transient and nonlinear, the research of mould temperature field was based on experiment. As the development of computer technology and numerical simulation, it has become possible that study mould temperature field with numerical simulation software. A new method of research on the relation between temperature field and its effected factors by CAE is presented in this thesis.The boss is the common structure of casting which can easily result in hot spot because of the difference in the wall thickness. So it is where casting defect happen easily. This thesis studies the boss hot spot by ANSYS thermal solution. With the condition of natural cooling of core, this thesis research how core wall thickness, casting wall thickness and the wall thickness at the part of hot spot effect the hot spot of casting. Therefore we can find the measures of removing hot spot according to the research result.Based on the above consideration, these conclusions were drawn from the simulation analysis:①At the condition of natural cooling of core and without regard to the effect of dope, analysis derived the relation equation between the D-value which is the result of the maximum temperature subtracting the temperature at casting center and the effective factors:⊿ T=0.341e(-0.201h+0.775w)The equation manifests that the D-value also increases along with the increase of hot pot's wall thickness; the D-value decreases along with the increase of core's wall...