Premium Computerized Universal Testing Machine
Machine Consists of:
Straining unit:
- This consists of a cylinder motor with chain and sprocket drive and a table coupled with the ram of the hydraulic cylinder, mounted on to a robust base.
- The cylinder and the ram are individually lapped to eliminate friction. The upper cross head is rigidly fixed to the table by two strengthened columns.
- The lower cross-head is connected to two screwed columns which are driven by a motor. Axial loading of the ram is ensured by relieving the cylinder and ram of any possible side loading by the provision of ball seating.
- A Rotary Encoder of minimum resolution 0.1mm is provided to measure the deformation of the specimen.
- Tension test is conducted by gripping the test specimen between the upper and lower cross-heads.
- Compression, transverse, bending, shear and hardness tests are conducted between the lower cross-head and the table.
- The lower cross-head can be raised or lowered rapidly by operating the screwed columns, thus facilitating ease of fixing of the test specimen.
Control Panel:
The Control Panel consists of a power pack complete with drive motor and an oil tank, control valves and electronic display unit.
Power Pack:
The power pack generates the maximum pressure of 200 kgf/cm2.
The hydraulic pump provides continuously non-pulsating Coil flow.Hencethe 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 the oil flow is infinitely variable. Incorporated in the hydraulic system is a regulating valve, which Maintains a practically constant rate of piston movement.
- Control by this valve allows extensometer reading to be taken.
Principle of Operation for
- Operation of machine is by hydraulic transmission of load from the test specimen through pressure transducer to a separately housed load indicator.
- The system is ideal since it replaces transmission of load through lever sand 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 pressure transducer housedin the control panel.
- The transducer gives the signal to the electronic display unit, corresponding to the load exerted by the main ram.
- Simultaneously the encoder fitted on the straining unit gives the mechanical displacement to the electronic display unit.
- Both the signals are processed by the microprocessor and load and displacement is displayed on the digital readouts simultaneously.
Accuracy and Calibration:
- Electronic Universal testing machine is closely controlled for sensitivity, accuracy and calibration during every stage of manufacture.
- Machine is calibrated over each of its measuring range in accordance with the procedure laid down in IS 1828: Part1: 1991.
- Electronic Universal Testing Machine complies with Grade “A” of class 1 of IS-1828-Part1:1991.
