Em1 Microtest English d 2014

Electromechanical Materials Testing Machines EM1 MICROTEST

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Electromechanical Materials

Testing Machines EM1 series

MICROTEST

MICROTEST

MICROTEST, S.A. Instruments and Equipments for Materials Testing

(+34) 91 796 33 32 www.microtest-sa.com


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MICROTEST EM1/FR electromechanical

testing machines are designed to test a large

range of materials, including: rigid and

reinforced plastics, composites, ceramics ,

geo-textiles, concrete, rocks, mortars,

wood, sheet metal, welded specimens,

rubbers, adhesives, and medical products

and components, in tension, compression,

flexure, shear, tear and peel. They are widely

used in R&D Centers, Industry, Testing

Laboratories, Education centers, and for

calibration purposes in Force Calibration

Laboratories.

They are built in capacities ranging

from 20kN to 250kN, both tension and

compression. Under demand they can also be

made in lower and bigger capacities.

In MICROTEST EM1 machines the load is

applied by means of a central ball screw

driven system in a dual column frame. The

construction of the machine load frame, with

a double guiding columns and pre-loaded

leadscrew, make these frames have high

rigidity with negligible frame deflection.

This design allows for a single test zone for

both tension and compression tests. The test

zone can be modified by changing the height

of the upper static crosshead along the

columns and fixing it mechanically with the

help of the gripping system of this crosshead.

The machine has fixed end of courses that limit

the displacement of the moving crosshead to

the values of the upper and lower of the

position.

The moving crosshead is actuated by the

central screw driven system and guided by two

robust lateral columns. Thus a very good force

flow with direct force transmission to the

specimen is obtained during the test. The

vertical crosshead travel is determined and

limited for the length of the screw. The moving

crosshead ensures the lateral guidance of the

test axis and is not subjected to bending loads.

This electromechanical system is a double

effect one and is driven by a DC electric motor

(or a brushless motor) and includes an optical

encoder for a continuous measuring of the

moving crosshead position that allows also the

control of the test speed.

Inside the lower frame there is a transmission

system transmitting the mechanical power to

the central screw, usually including a heavy

duty gearbox and a pulley system.


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The main advantages of electromechanical testing machines over the hydraulic systems are:

High stability, mainly at low speed or long term tests (corrosion under tension tests, creep tests,

etc.).

Capability of keeping the load during long intervals, with error under 0.1% of the applied force,

or even better (< 0,01%) in the case of calibration by comparison force standard machines or

high stability of load tests .

Electromechanical machines can be operated at speeds ranging from a minimum of

0.0001mm to a maximum of 200 or 1000 mm/min, depending on the model, which

accommodates a wide range of materials and specimens.

Minimum maintenance: They do not need oil, filter or joints replacement.

They do not need extra space for hydraulic power source and they do not need any pipe or

external fittings to transmit the mechanical power.

Very low noise in comparison with hydraulic systems and without the risk of leakage of oil.

Low consumption of energy and no need of expensive cooling systems.

Moreover, the displacement of the moving

crosshead allows the application of the load

without impact, in a continuous way,

disregarding the state of cleanliness of electro-

valves or servo-valves needed in hydraulic

systems.

MICROTEST EM1/FR machines have ever shown

a very good behavior in long term tests, where

it is necessary to keep the load or the position

during long time at a high level of stability.

EM1 electromechanical testing machines

include one or more force transducers (load

cell) that provide better precision

measurement of the applied force than

pressure transducers or gages used in

traditional hydraulic systems. In this way the

force measurement is not affected by oil

temperature, local disturbances caused by the

oil flow, friction in the load cylinder, etc.

The test speed is digitally controlled and

measured by means of an incremental optical

encoder placed in the motor axis, obtaining a

high precision controlled movement, helped by

the high gear ratio of the system.


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The EM1 machines flexibility is further extended

by a wide array of accessories instrumentation,

grips and fixtures to perform all kind of test with

the higher efficiency. These accessories include

various LVDT extensometers, compressometers,

strain gage extensometers, high temperature

extensometers, as well as grips, holders, jigs or

platens for holding the test specimens. They

can also be delivered with special testing

equipment as high temperature furnaces,

climatic chambers, etc.

MICROTEST can provide a great variety of grips and accessories, depending on the material or test.

Among others:

Compression platens.

Pneumatic or manual grips for tensile tests with different jaws.

Bend fixtures.

Other test fixtures (shear, friction, tear, peel, etc)

Extensometers, furnaces, climatic chambers, etc.


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This flexibility makes EM1 machines very suitable in most of the standardized axial tests, where

the force to be applied is under the load capacity of the machine, in tensile test or compression tests in

the same single test zone.

Among others, with the suitable fixture, the following tests can be done:

Tensile tests on metal samples: standard shapes, ribbons, springs, screws, fasteners, washers,

wires, cables, elastomeric samples, etc

High temperature creep tests

Corrosion under tension tests.

Tensile tests on polymers, composites, rubbers, textiles, ropes, webs, wood, etc.

Tensile tests on standardized steel samples.

Tensile, shear or bending tests on aluminium samples or profiles.

Compression tests on concrete, mortars, ceramics, foams, wood, rocks, etc.

Friction tests, peel tests. Shear, etc.

Bending tests on mortars, concrete, ceramics, wood, paving tiles, etc.

CBR and Marshall test.

Calibration of force transducers (EN ISO 376).

Do not hesitate to contact us to consult any need about your tests.

Special EM1 version for High Temperature Creep

Testing, 50kN.


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MACHINE DESCRIPTION

LOWER CHASSIS

It contains the electromechanical driving

system, composed by: motor, gearbox, pulleys,

ball screws, bearings, etc. and electric

elements to control the machine.

Over this lower structure the load frame stands.

The base plate of this frame has also the nuts

and bearing units to allow the soft movement

of the moving crosshead when the screw is

actuated by the driving system.

The dimensions of this chassis can be modified

under demand.

LOAD FRAME: FIXED AND MOVING CROSSHEADS

The load frame has a high stiffness, with two

columns in chromed steel, an upper fixed

crosshead and the single central ball screw

that drives the moving crosshead, guided by

the columns. The test zone can be modified by

changing the height of the upper static

crosshead along the columns.

The upper fixed crosshead usually has the load

cell for measuring the force during the tests.

Several load cells in different lower capacities

can be added with the suitable coupling

elements.

The dimensions of the load frame can be

modified under demand to change the height

or the width in the test zone, for example.

ELECTROMECHANICAL ACTUATOR SYSTEM

This electromechanical system is a

double effect one and is driven by a DC

electric motor (or a brushless motor) and

includes an optical encoder for a continuous

measuring of the crosshead position that allows

also the control of the test speed.

The maximum speed and travel will depend on

the screw, motor and gearbox used.

Under demand, different solutions can be

adopted to have other values for speed or

crosshead travel.

To make possible an easy collocation of the

samples, the machine has a manual control for

the crosshead in the front panel of the

machine that allows the changing of the

position of the moving crosshead. The speed of

this movement is selectable by the SCM3000

software.

SAFETY SHIELD AND PROTECTIVE ELEMENTS

Every standard EM1 machine includes a

protective shield at the front side of the load

frame. This shield is made on a high resistance

and transparent polycarbonate and protects

the user from any potential debris. The

machine has also mechanical and electronic

limits features (including emergency button)

supplied to prevent movement of the actuator

beyond desired regions of operation or in case

of emergency.


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CONTROL, MEASUREMENT AND ACQUISITION SYSTEM

- The control and measurement is performed

by the SCM3000 electronic board developed

by MICROTEST. This electronic board provides a

closed loop control of the machine and

analogue to digital conversion for at least 8

channels. The control includes digital

input/output lines connected with the machine

and motor driver covering the rest of the

control and security functions of the control

system. The machine control can be monitored

by means of a computer via USB connection.

The software SCM3000 allows also the

recording of the different quantities data

during the test.

EM1/FR machines make use of this SCM3000

software that enhances the features of the

machine for any kind of test or material,

allowing the user the full control of any of the

functionalities of the machine. It’s a very

reliable and adaptable system. The description

of the SCM3000 software specifications is

shown apart. All database and controlled

parameters are managed using a computer

(included) with the MICROTEST SCM3000

software (English version).

SCM3000 software helps the user to automate

his operations, providing a powerful Method

and Result Editor, with the possibility of

exportation of data to Excel ® or ASCII files that

allows the generation of customized reports.

The test curves can also be rescale, recall and

re-plot by a Graphics Editor

The control system also includes: software

selectable servo-control by force or by

displacement (or other quantity), displays for

the configured channels, digital zeroing of any

channel, fully configurable channels,

calculated channels, configurable alarms,

digital recording of every configured quantity,

selectable sampling, automation of the tests

(tests methods and complex sequences of

movement or load), definition of test

parameters, calculations, graphical display of

recorded data and test results, etc.


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Technical Specifications

(*) Dimensions, weights and supply voltage can be adapted to the customer’s needs. They are only approximate

and dependant on the specific technical proposal.

(**) Without accessories.

(***) Other values are also possible, under request.

MODEL EM1/20 EM1/50 EM1/100 EM1/200 EM1/250

EM1/300

EM1/100/R

(reinforced)

EM1/200/R

(reinforced)

FORCE

CAPACITY kN 20 50 100 200 250-300 100 200

MOVING

CROSSHEAD

TRAVEL (typ.)

mm 150 200 350 200 200

Other values under request

Columns 2 columns

Type of frame Table top or floor standing Floor standing

Crosshead

Max. Speed

(typ. values in

bold)

mm/min

100

200

1000 500

Crosshead min.

Speed mm/min

0.0001 0.0001 0.0005 0.0005

0.001 0.001 0.001 0.001

0.005 0.005 0.005 0.005

Position

resolution mm 0.0001 <0.00005

Horizontal test

space mm 350-500 450-700

Max. Vertical

Test space (**) mm 700-1000

950-1250-

1500 880-1250-1500

1/Stiffness mm/N <5.10-6 <5.10

-6 <4.10

-6 <4.10

-6 <4.10

-6 <1.6.10-6

Typical

Dimensions

HxWxD (*)

H(mm) 1420 2070 2360-2560 2950

W(mm) 700 900-1150 990-1250 1200

D(mm) 415 500-600 500-600 600

Weight (*) kg 150kg(table top)

400kg(floor standing) 400kg 570kg 600kg 500kg

Accuracy class typ.

ISO 7500 0.5 0.5 0.5 0.5 0.5 0.5 0.5

Typical Main Force

transducer x Resolution

PB2/20

X0.5N

PB2/50

x1N

PB2/100

x2N

PB2/200

x5N

PBF/250

x10N

PB2/100

x2N

PB2/200

x5N

Typical secondary Force

transducer x Resolution

(***)

TSC1/2kN

X0.05N

TSC1/5kN

X0.1N

PB2/20

X0.5N

PB2/20

X0.5N

PB2/50

x1N

PB2/20

X0.5N

PB2/20

X0.5N

Std. Nominal

Supply Voltage

(*)

VAC 230Vac

1phase

230Vac

1phase

230Vac

1phase

230Vac

1phase

230Vac

1phase

230Vac

1phase

230Vac

1phase

Std. Power

Rating

Continuous (*)

kW 0.7 1 1.5 2 2.5 2 2

MICROTEST, S.A.

C/ Valle de Tobalina, 10 28021 – MADRID (Spain) Tel.: (+34) 91 796 33 32

[email protected] http://www.microtest-sa.com

Em1 Microtest English d 2014

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