Model-161 Bulge/FLC Tester

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The new Qualitest Bulge/FLC Tester offers unexpected possibilities within the field of modern material testing. Thus specimens up to a size of 400x650 mm can be tested by carrying out the hydraulic deep drawing test. In addition to the actual hydraulic forming process the design also allows the use of ball punches up to a diameter of 200 mm. The maximum drawing force is 1.000 kN. In order to guarantee an exact reading of the required drawing force even in case of lower forces these are divided into two measuring ranges. At specimen failure the test can be stopped both manually or automatically. The capture of the given dome geometry is carried out preferably by an optical measuring device (e.g. Laser Bulge Analyser, model 144) placed on top of the test head or by a standard displacement measurement of the dome height, max. measuring path being 100 mm, with digital indication.

The operation of the testing machine is most simple. After the specimen has been placed into the test head, the hydraulic system is started with the help of a push button whereupon in the first instance the test panel is clamped tightly. Thereafter the drawing piston moves upwards and presses the quantity of oil that is located between the piston and the test panel, into the direction of the test panel so that the specimen is formed into a spherical bulge. After the machine has switched off automatically at specimen failure all hydraulic pistons return to their ground position. Hinged protective panels made of Plexiglass, prevent oil splashes from spouting.

Characterization of material

The reliable and defined characterization of materials is a basic requirement that is absolutely necessary for gaining input data for modern simulation calculations which in turn are used for the faster development of components and tools. In addition, new methods are required for process monitoring and quality assurance supplying material information in a quick and easy manner. A car body is a good example to make clear how many different materials are used for the various components (Fig. 1). Dependend on their material properties e.g. TRIP/TWIP steels, qualified by their high stability, are used for loadsupporting components such as columns. Based on the struggle of the automotive industry for weight reduction, new aluminium, magnesium and steel alloys have been developed, which guarantee excelllent strength properties and a good forming behaviour at the same time even in thickness ranges of 1 to 2 mm.

For the characterization of these materials as well as for the quality assurance in production, effective test methods are needed which supply comprehensive informationon the forming behaviour

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