The Study of the Workpiece Heating Process during Gas Forming with Back-Pressure

The results of theoretical and experimental studies of the workpiece heating process during gas forming with back-pressure are presented in this article. In this method of forming, a sheet is intensively heated to the required temperature range for warm or hot processing and deformation. The workpiece is heated by unilateral exposure to the products of combustion of a gaseous fuel mixture, the temperature of which reaches 2 000…2 200 °C.  At the reverse side of the sheet, back pressure is applied by compressed air. As a result of the conducted studies, the dependence expressing the pattern of the workpiece temperature change in time is obtained. It has been shown that the temperature of the workpiece depends on its thickness, material, time of heating, as well as fuel mixture parameters. The experimental heating tests for steel and aluminum workpieces have shown the validity of the obtained dependence. It can be used for controlling the workpiece heating process where the time of heating and the fuel mixture pressure serve as the control parameters.

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