Calculation results of interfacial heat transfer coefficient of squeeze casting

The experimental measurement of interface pressure and internal temperature of squeeze casting and the calculation of interface heat transfer coefficient were studied

(1) By designing the mold and casting for squeeze casting experiment, designing the temperature measurement unit, accurately installing the pressure sensor and carrying out the squeeze casting experiment, a set of accurate measurement methods of mold temperature and interface pressure are established; the experimental data are processed by the low-pass filtering method based on fast Fourier transform; and the calculation method of interface heat transfer coefficient is established based on the principle of inverse algorithm The accuracy of the method is verified. The quantitative data of interface heat transfer coefficient and interface pressure are obtained.

(2) The interface pressure between casting and die increases to the maximum value at the moment when the applied pressure is applied. When the applied pressure is 70 MPa, 46 MPa and 23 MPa, the maximum interface pressure is 41.1 MPa, 27.1 MPa and 13.4 MPa respectively. When the interface pressure between casting and die reaches the maximum value, it decreases gradually.

(3) The interface heat transfer coefficient increases sharply to the maximum value of 62.8 kwm-2k-1 at the moment of applied pressure. After the pressure is applied, the interfacial heat transfer coefficient decreases sharply at the beginning, and then keeps a downward trend, but the decreasing rate gradually decreases, and finally almost remains unchanged until the interfacial pressure disappears. After the interfacial pressure disappears, the heat transfer coefficient of the casting die interface decreases with the solidification process.