Model 242-Basic

Fully automatic cupping and deep-draw testing machine for testing the ductility of coated ferrous and non-ferrous metals (such as coil coatings, painted, plastic-coated or galvanized materials). This testing machine is electro-hydraulically driven and has a maximum pulling force of 200 kN. This testing machine is equipped with digital displays for reading the drawing and blank holding force, as well as the drawing stamp travel. During the production of thermo-formed products, the materials are deformed along all three coordinate planes. In order to avoid any subsequent corrosion damage, the surface coating must not be damaged. The 242-Basic Model is well suited for using with sheet metal thickness ranging from 0.2 mm to 4.0 mm, for the standard inspections and verifications required for quality assurance.

Application: When manufacturing deep-drawn products the ingoing material is deformed in all three coordinating planes. Thereby the surface coating should not become defect to avoid subsequent corrosion. For the standard controls and proofs required for the purposes of quality assurance Model 242-Basic is particularly suitable to conduct cupping and deep drawing cup tests within the sheet metal thickness range of 0.2 mm to 4.0 mm. To intensify the tests by further special investigations, it is possible to carry out without any problem 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 above mentioned sheet thickness range of 0.2 mm to 4.0 mm is based on material with a tensile strength of 400 N/mm². In case of a higher/lower tensile strength the values mentioned concerning the maximum sheet thickness that can be drawn, are to be reduced/increased.

Purpose: The following reasons are important for using the Cupping and Deep Drawing Cup Test Machine, Model 242-Basic, for quality assurance, research and development:

• Lowering of the reject rate by concerted monitoring of the coating quality during production or in the process department.
• Immediate sorting out of lower quality arriving at the goods inwards department by means of the ERICHSEN cupping test or the deep drawing cup test. Without special test preparations it is possible to establish, if the material supplied corresponds to the prescribed properties.
• The sturdy construction and hydraulic operation ensure a wear-resistant functioning of the machine so that high accuracy of the test results at low maintenance and working expenses is guaranteed.

Description: The machine consists of a solid housing made of steel into which the test aggregate (test cylinder with work piston, sheet holder plate and die) are integrated. All components are easily accessible from outside the machine, and thus the tools for the individual tests can be changed quickly, too. The operating sequence of the testing machine has been designed in such a comfortable manner that cutting of the blank as well as drawing and ejecting of the cup are executed in one single operation.