Mathematical Modelling of Low Temperature Solder Direct Extrusion

Abstract

Defining of process technological parameters is very important for low temperature solder extrusion. A mathematical model of low temperature solder wire and rods direct extrusion, which allows determining the energy-power process parameters, has been developed. The validation of the mathematical model for adequacy was checked during a laboratory experiment on a hydraulic press. In laboratory the force and speed of pressing were measured and recorded using the data collection system installed on it. The validation of the model for adequacy was carried out by pressing 08.00 and 015 mm rods and 02.00 mm wire and showed fine precision of calculations with experimental measurements. The error did not exceed 10%. The resulting mathematical model was used for analytical studies of Sn-In alloy bars and wires direct pressing technological modes. Calculations have shown that a decrease in the finished rod (wire) diameter from 16.00 to 2.00 mm while maintaining the workpiece size 030.00 mm leads to an increase in the pressing force from 86 kN to 131 kN at the initial moment of pressing. It increases the elongation ratio from 4 to 256. The pressing force of 08.00 mm rod increases from 25 to 171 kN after an increase in the diameter of the workpiece from 12.0 to 40.0 mm. Analytical studies on the model showed that it is possible not only to study the pressing process in order to understand the mechanisms of forming the mechanical and operational properties of the finished rod (wire), but also to design resource-saving pressing modes for various product gauges, to carry out substantiated selection of the required equipment and accessories.