Cupping Test
Coatings & Industry > Mechanical properties > Flexibility and toughness
This Erichsen Lacquer and Paint Testing Machine, Model 200, is used for the ERICHSEN CUPPING TEST.
The Model 200 test the elasticity and adhesive quality of lacquers and other protective coatings on metallic supports by means of the Erichsen Cupping Test according to DIN EN ISO 1520, ISO 1520, BS 3900 : Part E4, SIS 18 41 77 and NF T 30-019, on coated sheet metal, with a tensile strenght of 400 N/mm2, up to 1,25 mm thick and from 70-90 mm wide.
Control of the depth by a counter with 0.1 mm accuracy.
The Model 200 test the elasticity and adhesive quality of lacquers and other protective coatings on metallic supports by means of the Erichsen Cupping Test according to DIN EN ISO 1520, ISO 1520, BS 3900 : Part E4, SIS 18 41 77 and NF T 30-019, on coated sheet metal, with a tensile strenght of 400 N/mm2, up to 1,25 mm thick and from 70-90 mm wide.
Control of the depth by a counter with 0.1 mm accuracy.
The testing machine including one test tool according to BS 3900 : Part E4, DIN EN IS0 1520, ISO 1520, DIN 53 156, SIS 18 41 77 and NF T 30-019 is precision made.
Technical Data
Width : 340 mm
Depth: 350 mm
Height: 450 mm
Net weight: approx. 36 kg
Drawing force: max. 30 kN
Sheet holder pressure: 10 kN (fixed)
Specimen width: max. 90 mm
Punch stroke: max. 18 mm
Display of cupping depth: digital (accuracy 0.1 mm)
Erichsen Test Tool No. 27 (already integrated)
| Test Tool No. | 27 | 11 |
| Ball punch | 20 mm | 8 mm |
| Sample Width | <= 90 mm | <= 30 mm |
| Sample Thickness | 02-1,25 mm | 0,2-1 mm |
Erichsen 200 Technical Details
Test Cylinder
Drawing force: max. 30 kN
Specimen width: max. 90 mm
Punch stroke: max. 18 mm
Specimen Dimensions
Specimen thickness: max.1.25 mm
Width: max.90 mm
Display of cupping depth: digital (accuracy 0.1 mm)
Model 200 is supplied with Test Tool No. 27.
Accessories available :
Test Tool Set No. 11 according to EN ISO 20482
For strip 30 - 55 mm wide and 0.1 - 1.0 mm thick, consisting of ball punch, drawing die and sheet holder ring.
Microscope with magnification factor 10 and battery operated illumination to fit on Model 200, for accurate visual observation of the beginning crack.
Test Tool Set No. 27 according to EN ISO 20482
For strip more than 90 mm wide and 0.1 - 1,25 mm thick, consisting of ball punch, drawing die and sheet holder ring
Lacquer and Paint Testing Machine, Model 202 EM
for testing lacquers and paints of all kinds for elasticity and adhesive quality using the Erichsen Cupping Test in conformity with DIN EN ISO 1520, BS 3900:Part E4, SIS 18 41 77 and NF T 30-019, on sheet metal specimens up to 1.5 mm thick and max. 100 mm width
The Testing Machine is equipped with:
* electromotive drive,
* a laterally opened test head,
* test tool N° 27 acc. to DIN EN ISO 1520,
* electric installation for connecting the illumination of the special microscopes (Ord.-Nos. 0235.01.32 or 0237.01.32),
* cupping speed infinitely variable from 6 mm/min to 60 mm/min or using a reversiblepotentiometer to set permanently to 0.2mm/s.
* a digital display for the acquisition of the ERICHSEN cupping value,
for testing lacquers and paints of all kinds for elasticity and adhesive quality using the Erichsen Cupping Test in conformity with DIN EN ISO 1520, BS 3900:Part E4, SIS 18 41 77 and NF T 30-019, on sheet metal specimens up to 1.5 mm thick and max. 100 mm width
The Testing Machine is equipped with:
* electromotive drive,
* a laterally opened test head,
* test tool N° 27 acc. to DIN EN ISO 1520,
* electric installation for connecting the illumination of the special microscopes (Ord.-Nos. 0235.01.32 or 0237.01.32),
* cupping speed infinitely variable from 6 mm/min to 60 mm/min or using a reversiblepotentiometer to set permanently to 0.2mm/s.
* a digital display for the acquisition of the ERICHSEN cupping value,
* with integrated preselection counter for setting the maximum cupping value required.
Performance Range
Test Cylinder
Sheet holder force: max. 2.5 kN
Drawing force: max. 30 kN
Drawing speed: max. 60 mm/min – inifinitely variable from 2 mm/min to 60 mm/min (set permanently to 0.2 mm/s)
Drawing punch stroke: 16 mm
Specimen Dimensions
Thickness: max. 1.5 mm
Width: max. 100 mm
Accessories :
Test Tool Set No. 11 according to EN ISO 20482
For strip 30 - 55 mm wide and 0.1 - 1.0 mm thick, consisting of ball punch, drawing die and sheet holder ring.
Test Tool Set No. 27 according to EN ISO 20482 For strip more than 90 mm wide and 0.1 - 2.0 mm thick, consisting of ball punch, drawing die and sheet holder ring.
Special Microscope with Holder and Illumination complete with connecting cable and plug, for observation of the test process, with a magnification factor of 10 over an area of 17.5 mm.
Stereo Microscope with Holder and Illumination 10-fold magnification and 18 mm field of vision
Digital Microscope, Model 456-USB
High-resolution digital microscope to be connected with PC/Laptop: 2 million pixels CMOS image sensor, integrated light (adjustable), video function, live view, direct image capture directly on the object, shootings with microscoping precision, scalable precision measurement.
The scope of supply includes:
Camera with USB cable,1 tube stand for 20x magnification, 1 tube stand for 40x/200x magnification, a swivel-type special stand, software CD, instructions.
Electric Special Measuring Device for accurate measurement of the break-down of the lacquer film during the Erichsen Cupping Test. The complete unit with insulating drawing die and LED display for crack indication.
| Test Tool No. | 27 | 11 |
| Ball punch | 20 mm | 8 mm |
| Sample Width | <= 90 mm | <= 30 mm |
| Sample Thickness | 02-1,25 mm | 0,2-1 mm |
Transmission-llluminationn-Based Crack Detection Method
Thin-walled metallic sheets and foils are increasingly gaining in importance in the automotive industry and in medical and food packaging.
A promising field of application for thin stainless steel sheets in the thickness range between 0.05 and 0.1 mm are PEM fuel.
Said material can be used to produce lightweight metallic bipolar plates by deep drawing, rolling, or hydroforming .
The most critical failure mode in sheet metal forming is the occurrence of a crack or fracture. In order to describe the formability of
the material, which is nceded in manufacturing to define specific process windows, the development of the crack during the forming process as well as the strains reached during crack initiation are used. In the Erichsen cupping test according to DIN EN ISO 20482 the crack detection is either performed through visual inspection by the machine operator during the running process or automatically by a crack detection system.
Since the manual visual inspection is highly operator dependent, crack sizes and the resulting dome height values for the same material batch can vary greatly from user to user as seen in Figure 1.
Thus, in sheet metal testing, the use of a crack detection system is generally preferred.
Crack detected by user A (a), crack detected by user B (b), and crack detected by user C (c).
Material: 1.4404
stainless steel with a wall thickness of 0.09 mm
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 0.02 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.
Specimen: standard cups inside diameter 33 mm. A varnished standard cup which has been drawn from a round blank with a diameter of 64 mm is used as a test piece. The cup has an inner diameter of 33 mm.
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.
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.
Technical Data
Dimensions: width 290 mm
height 190 mm
depth 390 mm
Weight (net): approx. 44 kg
Power supply: 230 V single phase , 50 Hz
Connected load: 0.5 kW
Fuses: approx. 2 A
Motor output: 250 W
Motor speed: 2780 min -1
Gear oil: HLP-68 (DIN 51 524)
Noise level: < 70 dB (A)
Specimen: standard cups inside diameter 33 mm
Accessories available
Beading tools, consisting of beading shaft and beading roller: for sheet metal thicknesses of 0.2 - 0.5 mm, Ord.-No. 0252.01.32