Sheet Metal Testing Machines

These testing machines (type BUP) are used to determine and evaluate sheet metal properties.

Typical test methods include Erichsen cupping tests (EN ISO 20482), in which a hemispherical punch is pressed into a clamped test piece until a crack appears. There is no in-flow of the sheet metal.

The drawing formability of the sheet metal is determined from the punch penetration depth. Another test method frequently used is the earing test to EN 1669. In this test circular blanks are punched or inserted and drawn into cups (metal in-flow). The deep-drawing characteristics of the metal are determined via the percentage ear height ratio.

Other metal-forming test methods include square cup tests, hole expansion tests, FLC tests and bulge tests.

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Advantages & features
Test tools/fixtures
Typical specimens
Technical overview

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Key advantages and features

Description

BUP testing machines are available in 5 versions with a maximum ram force of 100, 200, 400, 600 or 1000 kN.
A punch function is incorporated into the BUP testing machine, allowing a blank to be pressed and a cup drawn in one operation (from BUP 200 upwards).
Individual adjustments to the test sequence are possible, e.g. deep drawing speed and clamping force.
With 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.

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).

Key test tools/fixtures⁽⁴⁾

Earing tests

In the earing test cups are drawn from metal sheets and the earing formation at the edges of the cups is evaluated.

Earing tests

In the earing test cups are drawn from metal sheets and the earing formation at the edges of the cups is evaluated.
Forming limit curves (FLC)

The test to determine the change in forming limit is used to test the maximum multiaxial ductility of sheet metal.

Forming limit curves (FLC)

The test to determine the change in forming limit is used to test the maximum multiaxial ductility of sheet metal.
Erichsen cupping tests (EN ISO 20482)

In cupping tests on sheet metal a spherical drawing punch is pressed into a clamped metal sheet until a crack appears. The cupping test is used to assess drawing formability.

Erichsen cupping tests (EN ISO 20482)

In cupping tests on sheet metal a spherical drawing punch is pressed into a clamped metal sheet until a crack appears. The cupping test is used to assess drawing formability.
Hole expansion tests

In the hole-expansion test, metal strip containing a hole is clamped round the outer edge and the metal is deep drawn until a crack appears.

Hole expansion tests

In the hole-expansion test, metal strip containing a hole is clamped round the outer edge and the metal is deep drawn until a crack appears.

Various sheet metal testing specimens⁽⁴⁾

Earing test

Earing test
Fukui

Fukui
Erichsen cupping tests

Erichsen cupping tests
FLC test

FLC test

Technical overview

100 kN / 200 kN

Type	BUP 100	BUP 200
Item no.	049779	024024
Test load, max. (ram force, max.)	100	200	kN
Machine dimensions
Total height, approx.	1,635	1,635	mm
Table height	880	880	mm
Height to tool head	1,185	1,185	mm
Width	850	850	mm
Depth	1200	1200	mm
Weight, approx.	650		kg
Punch force, max.	275	275	kN
Clamping force, max.	275	275	kN
Dimensions of the specimen
Blank (punchable)	Ø 118	Ø 118	mm
Blank, insertable, max.	Ø 165	Ø 165	mm
Blank, insertable (with centering finger), max.	Ø 105	Ø 105	mm
Sheet metal strip width, max.	128	128	mm
Sheet metal thickness, max.	6.4	6.4	mm
Measurements of the test tools
Draw matrix, outer, max.	Ø 155	Ø 155	mm
Draw die, max.	Ø 60	Ø 60	mm
Read-off accuracy for ram stroke	0.01	0.01	mm
Read-off accuracy for ram force	0.01	0.01	kN
Read-off accuracy for clamping force	0.01	0.01	kN
Reading accuracy of deep drawing speed	0.01	0.01	mm/s
Ram stroke (travel of the deep draw piston)	0 ... 80	0 ... 80	mm
Deep drawing speed, max.	1200	1200	mm/min
Coolant
Coolant water connection	G1/2"	G1/2"
Coolant water req. at 20 °C water temperature	4	4	l/min
Electrical supply data
Electrical power supply	3 x 400	3 x 400	V (3Ph, N, PE)
Power consumption	10	10	kVA
Frequency	50	50	Hz
Back-up fuse	32	32	A

400 kN / 600 kN

Type	BUP 400	BUP 600
Item No.	037359	049042
Test load, max. (ram force, max.)	400	600	kN
Machine dimensions
Overall height, approx.	1850	1850	mm
Table height	955	955	mm
Height to tool head	1185	1180	mm
Width	1048	1048	mm
Depth	1775	1775	mm
Approx. weight	1600	2100	kg
Punching force, max.	400	600	kN
Clamping force, max.	400	600	kN
Specimen dimensions
Blank (punchable)	Ø 250	Ø 250	mm
Blank insertable, max.	Ø 250	Ø 250	mm
Blank insertable (with centering finger), max.	Ø 220	Ø 220	mm
Sheet metal strip width, max.	260	260	mm
Sheet thickness, max.	10	10	mm
Tool/fixture dimensions
Drawing-die outside, max.	Ø 250	Ø 250	mm
Drawing-punch, max.	Ø 120	Ø 120	mm
Reading accuracy, ram stroke	0.01	0.01	mm
Reading accuracy, ram force	0.01	0.01	kN
Reading accuracy, clamping force	0.01	0.01	kN
Reading accuracy, deep drawing speed	0.01	0.01	mm/s
Ram stroke (travel of deep draw piston)	0 ... 120	0 ... 120	mm
Deep drawing speed, max.	1000	1000	mm/min
Coolant water
Coolant water connection	G1/2"	G3/4"
Coolant water req. at 20 °C water temperature	7	7	l/min
Electrical supply data
Electrical supply	3 x 400	3 x 400	V (3 Ph/PE)
Power consumption	17.5	17.5	kVA
Frequency	50	50	Hz
Back-up fuse	32	32	A

1000 kN

Type	BUP 1000
Item No.	632802
Test load, max. (ram force, max.)	1000	kN
Machine dimensions
Overall height, approx.	1734	mm
Table height	1076	mm
Height up to tool head (w/o protective screen), approx.	1353	mm
Width	1200	mm
Depth	1970	mm
Approx. weight	2100	kg
Punching force, max.	1000	kN
Clamping force, max.	1000	kN
Specimen dimensions
Blank (punchable)	Ø 250	mm
Blank insertable, max.	Ø 250	mm
Blank insertable (with centering finger), max.	Ø 270	mm
Sheet metal strip width, max.	260	mm
Sheet thickness, max.	10	mm
Tool/fixture dimensions
Drawing-die outside, max.	Ø 250	mm
Drawing-punch, max.	Ø 120	mm
Reading accuracies
Reading accuracy, ram stroke	0.01	mm
Reading accuracy, ram force	0.01	kN
Reading accuracy, clamping force	0.01	kN
Reading accuracy, deep drawing speed	0.01	mm/s
Ram stroke (travel of deep draw piston)	0 - 150	mm
Deep drawing speed, max.	750	mm/min
Coolant water
Coolant water connection	G3/4"
Coolant water req. at 20°C water temperature	10	l/min
Electrical supply data
Electrical power supply	3 x 400	V (3 Ph/PE)
Power consumption	16	kVA
Frequency	50	Hz
Back-up fuse	32	A