A simple hand operated mechanical testing machine for quality control on lacquers, paints and plastic coatings on sheet metal using the Erichsen Cupping Test.

The coated specimen is drawn into a die by a spherical nosed punch until the stretched coating material cracks or peels. The depth of drawing relates to the adhesion and elongation properties of the coating. Specimens may be up to 1.25 mm thick and 70-90 mm wide and the test is in accordance with ISO 1520, BS 3900: Part E4 and DIN ISO 1520.

This simple to operate Lacquer and Paint Testing Machine is used for rapid and accurate measurement of the elongation and adhesion properties of protective paints and other coatings of all types using the Erichsen Cupping Test in conformity with DIN ISO 1520, ISO 1520, BS 3900: Part E4.

The Testing Machine is a self-contained unit with an electro-hydraulic drive, connection for the illumination of the microscopes and digital read-out for the display of the Erichsen Cupping Test Value.

Larger test panels can be accommodated due to the laterally opening test head.

The deep drawing process can be viewed with the optional Videomaster CCD camera system or a stereo microscope. An electric measuring device is also available at time of order to remove any subjectivity in detecting the failure point.

The Erichsen stamping paint testing machine, Model 206, has an electrohydraulic drive and blanking and drawing force of approx. 80 kN and blank holding force adjustable between 0 and 18 kN.

Model 206 functions on the principle of a blanking and drawing press and provides manufacturers and users with a standard test procedure for assessing the quality of stamping paints, plastic and other coatings on metal substrates. Testing is carried out quickly and, where required, in series. Using a max. blanking and drawing force of approx. 80 kN, Model 206 forms standard cups from painted sheet metal with a thickness of between 0.1 mm and 2.8 mm and a tensile strength of 200 N/mm2, or up to 1.0 mm sheet thickness with 400 N/mm2, in a quick process which can be carried out in series if necessary.

The stamping paint testing machine enables the quality of coatings on deep-drawn parts to be evaluated simply and accurately. During the test the coating is subjected to stresses equivalent to those applied during deformation by means of deep drawing with clamping pressure. This means that the coating must withstand compression, extension and bending strains under considerable pressure without the occurrence of surface or internal damage which could later give rise to corrosive attack.

Model 212 is a fully automatic cupping and deep-drawing cup test machine for testing the ductility of coated, ferrous and non-ferrous metals (eg. stamping paints, lacquered, plastic coated or electroplated materials). The testing machine is provided with an electro-hydraulic drive with a maximum drawing force of 100 kN as well as digital displays indicating the drawing force, the blank holding force and the drawing punch displacement

When manufacturing deep-drawn products the ingoing material is deformed in all three co-ordinating planes. The surface coating should not become defective to avoid subsequent corrosion. For the standard controls and proofs required for the purposes of quality assurance, Model 212 is particularly suitable to conduct cupping and deep-drawing cup tests within the sheet metal thickness range of 0.1 mm to 3.0 mm. To intensify the tests by further special investigations, it is possible to easily carry out a redraw (a second deep-drawing operation conducted on the standard cup using a smaller drawing die and drawing punch).

Furthermore the Bead Test Instrument, Model 227, can be used to form a bead into the cylindrical wall of a standard cup until a mechanic destruction of the coating is achieved. This is another possibility to intensify the test.

The following reasons are important for using the Cupping and Deep-drawing Cup Test Machine, Model 212, for quality assurance, research and development:

Model 242 is a fully automatic cupping and deep-drawing cup test machine for testing the ductility of coated ferrous and non-ferrous metals (eg. stamping paints, lacquered, plastic coated or electroplated materials).

The testing machine is provided with an electro-hydraulic drive, programmable logic control, automatic test sequence and has a maximum drawing force of 200 kN. A digital display indicates the drawing force, the blank holding force and the drawing punch displacement.

Bead Test Instrument Model 227 measures the residual deformation capacity of coatings by drawing a wall bead into standard 33 mm dia. cups and measuring the bead depth to an accuracy of 0.01 mm.

This enables the quantitative assessment of the technological properties of stamping paints and plastic coatings. The instrument was designed to produce stresses comparable to those which occur in practice and is particularly suited for use in the development of high quality stamping paints.

Stamped-out metal containers such as shoe cream tins feature a bead rolled into the vertical wall of the container which serves to position the lid. The stamping paint at the crest of this bead is most susceptible to cracking and peeling because the coating in this area is subjected to a higher degree of deformation.

The bead is formed to a depth where the deformation limit of the stamping paint is reached. During the test a conducting fluid moistens the coated surface of the cup and penetrates even the finest cracks in the coating. Once the conducting fluid meets the metal surface of the cup an appropriate reading indicates the degree of cracking. The method is reliable and reproducible and therefore a convenient means for manufacturers and users to communicate the quality of a stamping paint in numerical terms.