The Parametric Design Of Screw And Study On Temperature Field With Pug During The Process Of Extrusion Based On ANSYS In De-airing Pug Mill

De-airing pug mill is the key equipment used in plastic forming method of ceramic pug. Ceramic pug, during the process of extrusive, due to the large difference of temperature in spiral groove, resulting in the ceramic pug uneven, even branch layer phenomenon and ultimately reducing the quality of finished product, leading to pug technology uncompetitive with advanced training abroad. Therefore, studying how the temperature to impact on the flow characteristics in the extrusive process of ceramic pug has become an important topic.In this thesis, we combine National Natural Science Foundation Project "Study the key technologies of ceramic de-airing pug mill " and the National Technology Support Program" the key technology and equipment of green ceramic tiles" project, to study the temperature field effect on the flow characteristics in extrusion process of de-airing pug mill. Main content are as follows:(1) Based on AutoCAD design platform, apply AutoLisp programming language, DCL interface user language, a set of best complete parameters AutoLisp program are developed, and parametric geometry model of de-airing pug mill screw and other major components is established. Then the model is imported into ANSYS software to simulate.(2) Experimental platforms are constructed. The pug density, specific heat, thermal conductivity, yield stress and plastic viscosity parameters are measured out.(3) Using the related flow and thermal analysis software module, analyzing pug during extrusive process with different friction coefficients, heating the pug to different temperatures, different pug ambient temperature, the results show as follows: As the friction coefficient between pug and barrel, screw root, screw surface is larger and pug’s extrusive pressure increases, the fever is more severe and branch layer is more obvious. The barrel and screw surface show the greatest effect on friction heat, pug with rapid heat transfer and a lot of viscous dissipation in the process of heated transportation, but the turning movement does little effect on the productivity of pug under the action of friction; As the pug heating temperature increasing, the velocity of pug decreases, branch layer becomes clear, productive capacity of de-airing pug mill has decreased,when heating temperature near to 55 degree dehydration hardening phenomenon appears; Changing the barrel temperature, the barrel wall between the internal and external exists fast rate of transfering heat, pug has strong convection in spiral groove, leading to the pug’s ring flowing from barrel wall to screw root, when the barrel temperature is less than 17degree, this is the input temperature of pug, with the barrel temperature increasing the speed of pug is increasing, branch layer has been improved, productive capacity of de-airing pug mill has increased, until the tube body temperature reached 17 to 25 degrees, the speed and mixing pug achieve to the best state, but when the barrel temperature higher than 25 degree, the speed of pug is decreasing, branch layer has been deteriorated , productive capacity of de-airing pug mill has decreasing.These research results provide a theoretical basis to the designing and technique control process of de-airing pug. On this basis, we proposed measures to improve the quality of pug.