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BUP Sheet Metal Testing Machines

  • Metals
Test load
  • 100 - 1,000 kN
Type of test
  • Cupping test
  • Earing test
  • Hole expansion test
  • Forming limit curve
  • ISO 20482
  • DIN EN 1669
  • ISO 12004
  • ISO 16630

Flexible testing solution for sheet metal forming

With the BUP sheet metal testing machines, characteristic values of the ductility of sheet metals are determined and evaluated. Sheet metal testing machines support development processes in the characterization of new alloys and new metalworking technologies, as well as in eventual series production.

The benefits of sheet metal testing machines are based on flexibility, easy and fast fixture changes for different tests, and the individually controllable integrated functions such as holding down, punching, drawing and ejection.

BUP testing machine for sheet metal forming

Testing machine for measurement of the ductility of sheet metal to common standards (DIN EN ISO 20482, DIN EN 1669).

Advantages & Features

Advantages & Features
Operation Benefits


  • The BUP sheet metal testing machines for sheet metal forming are available in five versions with a maximum ram force of 100 kN, 200 kN, 400 kN, 600 kN or 1,000 kN.
  • A punch function is integrated in the BUP testing machine, allowing a blank to be punched and a cup to be drawn in one operation (starting at BUP 200).
  • The test sequence can be individually adjusted—as for example, the sequence of the deep drawing speed and the sheet metal clamping force.
  • With the optional testXpert III testing software, the test results can also be evaluated graphically and saved.

Advantages & Features

  • Fast, easy tool and fixture changes, including drawing-punch, drawing-die, blank-holder, cutting-punch, cutting-ring and scraper-ring. Numerous modular expansion options.
  • Test tools/fixtures from earlier-generation machines can still be used (with some restrictions). Test tools/fixtures for established test methods available 'off-the-shelf', special tools/fixtures on application.
  • Low piston-cylinder friction enables accurate measurement recording and excellent reproducibility.
  • Clean and quiet in operation. Easily transportable thanks to compact design.
  • Hydraulic cup-extractor via integrated piston, with piston rod acting through drawing-punch.
  • Electronics can be swiveled to optimum viewing angle for measured values.
  • Conveniently positioned controls.
  • Electrical and hydraulic protection for all functions.
  • Adjustable automatic blank-holder unloading during test enables cup-drawing without crushing ear.
  • Automatic setting of pre-selected clamping force after blanking procedure.
  • Automatic piston withdrawal and switch-off after end of test due to crack detection or on reaching maximum ram stroke (s-limit).
  • Swing doors and removable casing panels for easy access to components.
  • Open design allows multiple tests to be performed on long sheet-metal strips without the need to open and close the tool head.
  • No unpleasant odors thanks to closed oil-circuit.
  • Special solutions (e.g. piezo load cell, different deep drawing speeds, separate hydraulic power-packs etc.) are available on request.

Operation Benefits

  • Change deep drawing speed during test (BUP 400 / 600 / 1000).
  • Operating-mode switch for automatic or manual operation (BUP 400 / 600 / 1000).
  • Two-handed operation eliminates risk of accident when closing the manual tool head of the BUP 100/200 (e.g. falling due to accidental jolt).
  • Hydraulic opening and closing of tool head, with 2-handed operation (BUP 400 / 600 / 1000).
  • Setup stroke for easy tool/fixture change (BUP 400 / 600 / 1000).

Technical overview

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Related Products and Accessories

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Typical Test Methods for Sheet Metal Forming

Typical test methods for sheet metal forming include the cupping test to Erichsen (ISO 20482) and Olsen (ISO 20482), the earing test for determination of earing tendency (ISO 11531 / EN 1669) and hole expansion tests to ISO 16630.

Particular importance is given to determination of the forming limit curve (FLC) to ISO 12004, which is used in a two-stage experiment to generate critical deformations in tests, which are then compared with existing deformations on real components and evaluated. Once the forming limit curve has been determined, it is used at the component design stage to help optimize forming, thereby speeding up the development process.

Test methods for sheet metal forming
to Test methods for sheet metal forming
Cupping test on metals to Erichsen/Olsen
ISO 20482, ASTM E643-84
Stretching capacity of a sheet metal
to Cupping test on metals to Erichsen/Olsen
Earing test on metals/aluminum
ISO 11531, DIN EN 1669
Determination of the ear formation
to Earing test on metals/aluminum
Determination of the edge crack sensitivity on metals
ISO 16630
Hole expansion test with conical punch
to Determination of the edge crack sensitivity on metals
Forming limit curve (FLC) of metals
ISO 12004
Determination of the failure limit of a sheet metal
to Forming limit curve (FLC) of metals


Name Type Size Download
  • Product information: Sheet metal forming 100/200 kN PDF 524 KB
  • Product information: Sheet metal forming 400/600 kN PDF 514 KB
  • Product information: Sheet metal forming 1000 kN PDF 523 KB

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