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Compression Testing Machines

 
Compression Testing Machines
 
Compression Testing Machines
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Features :
   
Loading Accuracy as high as + 1%
Straining at variable speeds to suit a wide range of materials.
Continuous roll autographic recorder supplied as standard to enable study of the behavior of materials
Motor driven geared shafts for quick effortless adjustment of cross-head-to facilitate rapid fixing of test specimen.
High reading accuracy due to large size and design of dial.
Wide range of standard and special accessories, including load stabilizer.
Large effective clearance between columns enables testing of standards specimens as well as structures.
Simple controls for easy of operation.
Robust staining frame of an extremely rigid construction.
Safe operation ensured be means of safety devices.
   
 Application :
 
  FIE Compression Testing Machine is designed for test materials under compression bending, transverse and shear loads. Hardness test on metals can also be conducted.
   
 Principal of Operation :
   
 
   
Operation of the machines is by hydraulic transmission of load from the test specimen to separately housed load indicator. The hydraulic system is ideal since it replaces transmission of load through levers and knife edges, which are prone to wear and damage due to shock on rupture of test pieces.
 
Load is applied by a hydrostatically lubricated ram. Main cylinder pressure is transmitted to the cylinder of the pendulum dynamometer system housed in the control panel. The cylinder of the dynamometer is also of self-lubricating design. The piston of the dynamometer is constantly rotated to eliminate friction. The load transmitted to the cylinder of the dynamometer is transferred through a lever system to a pendulum. Displacement of the pendulum actuates the rack and pinion mechanism which operates the load indicator pointer and the autographic recorder. The deflection of the pendulum represent the absolute load applied on the test specimen.
 
Return movement of the pendulum is effectively damped to absorb energy in the event of sudden breakage of a specimen.
 
Machine consists of :  
 
   
Straining Unit 
 
This consists of a hydraulmic cylinder and a table coupled with the ram of hydraulic cylinder, mounted on robust base. The cylinder and the ram are individually lapped to eliminate friction. The cross-head is connected to two screwed columns and is driven by a motor, for rapid adjustment of test height.
 
An elongation scale with a minimum graduation of 1.0 mm, is provided to measure the deformation of the specimen.
 
Compression, transverse, bending, shear and hardness tests are conducted between the lower cross head and the table.
 
Control Panel : 
 
The control Panel consists of a power pack complete with drive motor and an oil tank, control valves a pendulum dynamometer a load indicator system and an autographic recorder.
 
Power Pack :
 
The power pack generates the maximum pressure of 200 kgf/cm2 the hydraulic pump provides continuously non-pulsating oil flow. Hence the load application is very smooth.
 
Hydraulic Controls :
 
Hand operated wheels are used to control the flow to and from the hydraulic cylinder. The regulation of oil flow is infinitely variable incorporated in the hydraulic system is a regulating valve which maintains a practically constant rate of table movement.
 
Load Indicator System :
 
This system consists of a large dial and a pointer. A dummy pointer is provided to register the maximum load reached during the test. Different measuring ranges can be selected by operating the range selection knob. An overload trip switch is incorporated which automatically cuts out the pump motor when the load range in use is exceeded.
 
Pendulum Dynamometer : 
 
This unit permits selection of favorable hydraulic ratios producing relatively small frictional forces. Pressurised oil in the loading cylinder pushes up the measuring piston proportionately and actuates the special dynamometer  system. The piston is constantly rotated to eliminate friction. The dynamometer system is also provided with an integral damper and ensures high reliability of operation. The load transmitted to the dynamometer is transferred through a pendulum to the load indicator.
 
Autographic Continuous Roll Load-Elongation Recorder :
 
This unit is of the pen and drum type and is supplied as standard. The horizontal motion of the pen produces the load ordinate of the diagram and the drum rotation produces the extension ordinates in the ration of either 1:5 or 1:10.
A continuous roll of graph paper is stored inside the drum and is easily replaced.
 
Accuracy & Calibration : 
 
AII FIE Compression Testing Machines are closely controlled for sensitivity, accuracy and calibration during every stage of manufacture. Every machine is then calibrated over each of its measuring ranges in accordance with the procedure laid down in BS : 1610 : Part 1 :1992 and IS 1828. 
An accuracy of + 1.0% is guaranteed from 20% from 20% of the load range selected to full load. Below 20% of the selected range, the maximum permissible error is 0.2% of the full load reading.
   
Specification : 
   
 
Model
-
CTM 50
CTM 100
CTM 200
CTM 300
CTM 500
 Maximum capacity
 kN
 500
 1000
 2000
 3000
 5000
 1st Measuring Range
 kN
 0-500
 0-1000
 0-2000
 0-3000
 0-5000
 Minimum Graduations
 kN
 1
 2
 4
 5
 10
 2nd Measuring Range
 kN
 0.250
 0-500
 0-1000
 0-1500
 0-2500
 Minimum Graduations
 kN
 0.5
 1
 2
 2.5
 5
 3rd Measuring Range
 kN
 0-100
 0-250
 0-500
 0-600
 0-1000
 Minimum Graduations
 kN
 0.2
 0.5
 1
 1
 2
 4th Measuring Range
 kN
 0.50
 0-100
 0-250
 0-300
 0-500
 Minimum Graduations
 kN
 0.1
 0.2
 0.5
 0.5
 1
 Number of division on load measuring dial 
 500
 500
 500
 600
 500
  Maximum Clearance for compression test at fully descended working piston
 mm
 500
 500
 700
 700
 1000
 Ram stroke
 mm
 100
 100
 150
 150
 250
 CONNECTED LOAD
-
 -
-
-
-
-
 Power
 Kw
 1.12
 1.5
 2.2
 4.5
 4.5
 V
-
 400-440
 400-440
 400-440
 400-440
 400-440
       Æ
-
 3
 3
 3
 3
 3
 Weight
-
 -
-
-
-
-
 (Approx.)
tone
 2
 2.2
 3.6
 8.9
 13
   
Special Accessories :
   
  These include load stabilizer, Brinell test Attachment, Bend Test Attachment, Shear Test Attachment and a wide range accessories offered on request at additional cost.
   
Installation :
   
  It is recommended that machines be erected on a foundation. Details on foundation can be given on request
 

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