| 摘要 |
The invention relates to a device for processing a workpiece, said device comprising the following features: - a punch on the one side of the workpiece - a die on the opposite side of the workpiece; - a conductive electric heating system for generating an electric current that flows through the workpiece starting from a component situated on the one side of the workpiece outside of the punch to a component situated on the other side of the workpiece outside of the die. The invention relates to a device for processing a workpiece, said device comprising the following features: - a punch on the one side of the workpiece - a die on the opposite side of the workpiece; - a conductive electric heating system for generating an electric current that flows through the workpiece starting from a component situated on the one side of the workpiece outside of the punch to a component situated on the other side of the workpiece outside of the die. A Constant Volume Gas Thermometer (CVTG) device for measuring the temperature with high precision over a wide temperature range comprises a pressure measurement device (13), which comprises a mechanical assembly forming a membrane (4). The capillary tube (3) communicates with the bottom side (5) of the membrane (4) and a first pressure measurement element (2) on the membrane (4) generates a signal in dependence of a deformation of the membrane (4). Further, the CVTG comprises electronic means (18) for reading and correlating the signal of said first pressure measurement element (2) to the temperature of the gas cartridge (1). The gas volume inside the pressure measurement device (13) is minimized by careful design and tight tolerances. To measure pressures below 0.1 MPa inside the CVGT with sufficient accuracy, the CVGT include a pressure measurement device (9) which is based on the Pirani measurement principle. A Pirani measurement device measures the thermal conductivity of the surrounding gas. To this end, a thermally insulated wire or surface is heated electrically to a defined temperature, while the surrounding gas is at ambient temperature. If the thermal conductivity of the surrounding gas changes, either the Pirani element's temperature changes, or the electrical heating power needs to be adapted in order to maintain the Pirani element's temperature. |
