A study of the entry-region length of circular-extrusion dies

作者：Liang JZ; Sun XL; Tang CY^*; Tang GJ

来源：Journal of Materials Processing Technology, 1998, 74(1-3): 223-226.

DOI：10.1016/S0924-0136(97)00272-0

• circular extrusion dies
• die diameter
• entry-region length
• visco-elastic fluid

The flow properties of a visco-elastic fluid in the entry region of a circular die in the extrusion process have been investigated. Using the proposed approach, the time required for the fully developed flow of a visco-elastic fluid can be predicted. It has been found that the fluid flow will become fully developed when the residence time t(R) is seven times the relaxation time tau. On the basis of the results, an equation for calculating the entry-region length of circular dies has been derived, and the entry-region length of two rubber compounds in capillary extrusion has been determined, the results showing that the entry-region length is about 1 similar to 2 times the die diameter.

• 出版日期1998-2
• 单位华南理工大学