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QUALIRON
consists of a hand held caliper/electronic unit fitted with a
display giving velocity readings and acceptance band indicator
lamps. The caliper is of lightweight durable construction, well
balanced to reduce operator fatigue and allow accurate operation
by relatively unskilled personnel. The operator simply places
the caliper jaws over a suitable part of the casting and presses
the trigger.
QUALIRON
automatically clamps the casting between the transducer and the
anvil and provides a reading of the sound velocity.
QUALIRON
also indicates if the casting is within preset limits of acceptance.
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Non-Destructive
Rapid
& Accurate
Reliable
& Simple
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Instant
Results
As-Cast
Surfaces
Portable
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FEATURES
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Totally Non-destructive test
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Rapid
testing of individual castings
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Simple
and rapid setup procedure
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Digital
Velocity Display
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Visual
indication of Accept or Reject
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Automatic
Pneumatic Caliper Clamping
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All
user Controls and Displays mounted in Caliper
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Virtually
no operator training required
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Thickness
range 10 to 100mm
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Velocity
range 1000 to 9999 m/sec
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Caliper
weight 1.65Kg
The
increasing use of spheroidal graphite iron in high duty applications
has been encouraged by the ease and rapidity with which individual
castings may now be tested for metal quality. In place of skilled
and laborious section cutting, polishing and examination under a
microscope, the QUALIRON provides a very rapid method of checking,
giving an instant accept or reject indication for each and every
casting. Testing may be carried out by non-technical personnel on
the foundry floor.
The
method is based on the measurement of sound velocity of the metal.
Generally the higher the velocity the better the physical properties
(see separate report for details). It is also well proved that sound
velocity bears a closer relationship to mechanical properties than
does photomicrography. The determination of metal quality by assessment
of the amount of graphite in the nodular form by photomicrography
is unreliable as results vary from viewer to viewer. That method
in any case samples only a very small area of a flat plane in a
casting, which has been destroyed by the test.
Velocity
is the product of the time taken for a pulse of ultrasound to travel
through a casting section and of the distance traveled. The time
is measured by the ultrasound system and the distance traveled by
a specially designed hand-held caliper. By lightly clamping a convenient
part of the casting between the probe face and the measuring anvil
both the necessary parameters are established and are processed
by the ultrasound system to show, on an LCD, the sound velocity
of the metal in metres/second.
The
procedure for establishing a minimum velocity for acceptable metal
quality in a particular design of casting is very simple. Firstly
the velocity of a small number of castings is measured using the
QUALIRON system, then the quality of those castings is assessed
by normal destructive methods. Velocity values can then be allocated
to respective properties. Once the minimum acceptable velocity has
been established the monitoring system can be set by adjusting the
Accept/Reject controls to that velocity. In subsequent tests any
casting of a similar type and treatment but with a slower velocity,
and therefore sub-standard quality, will trigger a red signal lamp,
and a casting with a faster velocity will provide a green signal.
Once adjusted for Accept/Reject level castings may be tested at
the rate of 700 per hour.
SPECIFICATION
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Caliper
Velocity
Range: 1000 - 9999m/sec
Thickness Range: 10 - 100mm
Display: 4 Digit LCD, 12.5mm Character
Dimensions: 360mm x 250mm x 80mm
Weight: 1.65Kg
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Power
Pack
Electrical
Supply: 110/120V 60Hz or 220/240V 50Hz
Air Supply: 4 Bar
Dimensions: 260mm x 300mm x 150mm
Weight: 6.5Kg
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FOR
MORE INFORMATION PLEASE SEE: ULTRASONIC
VELOCITY MEASUREMENT USED TO ASSESS THE QUALITY OF IRON CASTINGS
(pdf format) from our Technical Papers Library
To obtain this
information as an Adobe Acrobat document Click
Here.
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