Em2 Microtest English d Impr v11 Oct 2013

8/13/2019 Em2 Microtest English d Impr v11 Oct 2013

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Electromechanical Materials Testing Machines EM2 MICROTEST

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Electromechanical Materials

Testing Machines EM2 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 EM2/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 forcalibration purposes in Force Calibration

Laboratories.

They are built in capacities ranging

from 10kN to 1000kN, both tension and

compression. Under demand they can also be

made in other capacities.

In MICROTEST EM2 machines the load is

applied by means of a double screw driven

system with 2 or 4 guiding columns in the load

frame. The construction of the machine load

frame, with a double guiding columns and pre-

loaded lead screws, make these frames have

excellent rigidity with negligible frame

deflection.

This design allows for a single test zone for

both tension and compression tests. Users can

load heavy specimens withminimal effort. This

feature is further enhanced by a

programmable switch mechanism that allows

the operator to quickly set upper and lower

crosshead limits at any point within the frames

clearance.

The crosshead is actuated by the screw driven

system and guided by two or four robust lateral

columns. The vertical crosshead travel is

determined for the length of the screws and

can be modified under demand.

This electromechanical system is a double

effect one and is driven by a DC electric motor

or a brushless servo-motor and includes an

optical encoder or a high resolution motor

feedback system rotary for a continuous

measuring of the crosshead position that

allows also the control of the test speed.


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Inside the lower

frame there is a transmission system transmitting

the mechanical power to the screws, usually

including a heavy duty gearbox and a pulley

system.

Adjustable Working Height Option

The working height can be adjustable for

seated or standing operation by means of a

supplementary adjustable mounting platform.

This second base plate can be positioned in

height and mechanically locked to the 4

guiding columns of the frame at the desired

position.

This mounting platform is normally place above

the lower base plate and coupling elements

and even the load cell base plate can be

mounted on it.

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 orhigh stability of load tests .

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

0.05m/min to a maximum of 200 or 600 mm/min (or even 3000mm/min, depending on the

model), which accommodates a wide range of materials and specimens.

Minimum maintenance: They do not need oi l, 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 crossheadallows 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 EM2/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.

The 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 a high resolution motor

feedback system rotary or 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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ACCESSORIES

The EM2 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 EM2 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.


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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 the frame can have

threaded holes, linear guides, holders or

attachments when they have to be used with

climatic chambers, furnaces, etc.

The dimensions of this chassis can be modifiedunder demand to change the height of the

test zone, for example.

LOAD FRAME

The load frame has a high stiffness, with two or

four columns in chromed steel and double ball

screw.

The 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 crosshead has also the nuts and bearing

units to allow the soft movement of the

crosshead when the screws are actuated by

the driving system.

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 or a high resolution motor feedback

system rotary for a continuous measuring of the

crosshead position that allows also the controlof 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 themachine that allows the changing of the test

zone height. The speed of this movement is

selectable by the SCM3000 software.

SAFETY SHIELD AND PROTECTIVE ELEMENTS

Every standard EM2 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.

EM2/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. Its 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

replot by a Graphics Editor

A control panel is available in two ways: by

computer, SCM3000 software and an SCM3000

electronic unit with additional touch screen

panel interface (AFL-W10 type, optional) for

manual control which enables test start, test

stop, return, test status indication and variable

speed up/down jog buttons, fine position

up/down buttons and specimen protection

features. It includes two soft keys, results

display, programmable function keys and

specimen protection.

The SCM3000 electronicscan be connected to

this touch screen to provide stand alonemanagement of tests.

The control system also includes: software

selectable servo-control by force or by

displacement (or other quantity), displays forthe 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

the recorded data and test results, etc.


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Technical Specifications

(*) Basic standard specifications. Dimensions, weights and supply voltage can be adapted to the customers needs. They are only approximate and

dependant on the specific technical proposal. Maximum speed value affects power value and therefore the power value can be different from the

above ones.

(**) Without accessories.

(***) This dimensions and weight are only typical or example values. This model is always defined under customers specifications.

NOTE:Because MICROTEST has a policy of continuous product improvement, we reserve the right to change design and specificationsat any time

without prior notice.

MODEL EM2/02EM2/5-

10

EM2/20-

30EM2/50 EM2/100 EM2/200 EM2/300 EM2/500 EM2/1000

FORCE CAPACITY kN 2 5-10 20- 30 50 100 200 300 500 1000

TYP. CROSSHEAD

TRAVEL (typ.)

(*)

mm

500-

1200

700-

12001200 1200

1300-

1500

1200-

1500

1200-

15001200

1200

(***)

Other values according to users needsor even Adjustable Working Height Option

Columns 2 columns (2 ball screws + 2 or 4 guiding columns)

Type of frameBench top Floor standing

Single test space (Double test space is optional)Floor standing

Crosshead Max.

Speed

(typ. values in

bold, static)

mm/min

50 100 100 100 100 100 100 100 100

600 600 600 600 200 200 200 200 200

High speed ranges by using AC servomotor can be defined according users needsto achieve speeds

1000mm/min to 3000mm/min (values to be defined in each case)Crosshead min.

Controlled

m/minMinimum crosshead speeds from 0.05m/min to

Documents

Em2 Microtest English d Impr v11 Oct 2013