Principle of the test

The Lacquer and Paint Testing Machine, Model 202 EM, is a bench mounted unit with a sheet steel housing, test cylinder and operator’s control panel.
The coated specimen panel is entered into the opening of the test cylinder with the coated surface facing upwards. Due to the laterally opening of the cylinder also larger sheet metal panels can be accommodated in the test head. On Model 202 EM the sheet metal specimen is clamped automatically using a separate clamping piston.
The machine is operated via the touch panel in the front area. The clear and clear menu navigation via the touch panel has password-protected levels that protect against unauthorized access (such as program changes). Test parameters such as speed (2 – 60 mm /min) or punch stop are entered before the test begins.

The “Start” screen displays all the required parameters, such as the drawing distance and the drawing speed. After pressing the start button, the specimen is clamped and then automatically starts the “forming process”. The sample surface is subjected to bilateral bending and stretching during the cupping process. As soon as the first crack is visible on the surface the movement of the ball punch is stopped by pushing the stop function. The ERICHSEN Cupping Depth reached can be seen on the display. On completion of the test both the drawing and the clamping piston return to their starting position, and the specimen panel can be taken out of the test head. The system of the Lacquer and Paint Testing Machine, Model 202 EM, is secured by a limit switch and an overload protection, when reaching the final position.