Extrusion in Hydroenvironment in Laboratory Conditions

Abstract

Abstract. The application of liquid environment in forward extrusion is described in this paper. Theoretical part states findings from fluidic mechanics applied in the experimental part. Design solution of the tool is also presented. The experiments were done in laboratory conditions. The findings are stated with their limitations. Theoretical findingsAccording to Figure 1 points N and N´ define the axis of vertical cylinder. Vertical height difference between points N, N´ is h. All pressures perpendicular to the surface, here vertical, form a neutral resultant. The weight ρdSh contained in the cylinder operates in vertical direction, then pressures pN´dS and pN dS. First two forces operate down, the third operates up [1,2,3].Liquid in the cylinder is in balance according to: ρdSh + pN´dS -pN dS = 0. When divided by surface element dS, we get: pN = pN´ + ρh. (1) The difference of the specific pressures of two different points inside the liquid equals to the weight of vertical column of liquid, which has a unit of surface as a base and a difference of height contour of both points. The basic law of hydrostatics applies in any values of pressure pN´ a pN in equation (1). If pressure pN rises by value Δp, pN´ rises also by Δp. The increment of pressure is spreading evenly in all directions, because both considered points do not have to be on a common perpendicular [4,5].