TE 69 LOAD SCANNER

Description

The TE 69 Load Scanner is based on modified version of a universal test instrument for

tribological evaluation developed by Professors Sture Hogmark and Staffan Jacobson at Uppsala

University, Department of Materials Science, Sweden. The key difference between the TE 69

and the original Uppsala design is that in the latter, motion is applied to only one sample,

whereas in the TE 69, both samples are indexed, with the result that the applied load varies

linearly with displacement.

The device offers a new test configuration for assessing the friction and wear properties of

materials and lubricants. Two elongated test specimens, preferably bars or rods, are used. The

orientation of the test specimens and their relative sliding motion during testing is arranged in

such a way that the contact spot moves along a contact path on each specimen, and each spot

along this path on one specimen will only make contact to one spot on the other specimen, and

vice verse. The contact spot is the area over which the contact load is distributed.

The load is applied by means of a pulley mechanism and spring arrangement, connected

between the load arm and the lower specimen carriage. The loading arrangement is such that

the load increases or decreases with relative motion of the specimens, thus resulting in a

unique load at each unique contact point on the two specimens.

The lower specimen carriage is driven by means of a precision ball screw actuator.

Corresponding motion is transmitted to the upper specimen carriage by means of a simple

linkage, ensuring identical motion but in the opposite direction.

Standard Applications

A single pass experiment resembles the test procedure often used in scratch testing of coated

specimens. In scratch testing, the tip is usually made of diamond. For coatings evaluation using

the TE 69 Load Scanner, it is normal to have one specimen coated and select the same material

for the counter specimen, as expected in the practical application of coatings to components.

Thus, the friction and adhesion assessment performed better emulates actual conditions.

This TE 69 Load Scanner may also be used for repeated reciprocating sliding tests thus

demonstrating in a single test friction and wear characteristics under conditions ranging from

mild wear to scuffing on a single pair of specimens.

Alternative Configuration

The upper specimen carriage may be locked, with the upper sample replaced by a pin or an

indenter and the lower specimen replaced with a plate sample.

The traverse actuated loading system may be disconnected and a steady state load applied by

means of a pneumatic bellows and precision regulator, with the resulting load measured by load

cell..

With the upper carriage locked and traverse actuated loading, the machine can be considered

as a high load scratch tester. With the upper carriage locked and a steady state load applied,

the machine can be considered as a conventional Bowden-Leben (reciprocating pin on plate)

machine.

Control and Data Acquisition

The TE 69 has PC based sequence programmable control and data acquisition. This is provided

by COMPEND 2000 software running on a host PC, operating under Windows. Data is stored to

hard disc in standard spread sheet compatible file formats (.csv or .tsv). A 16 bit high-speed

data acquisition card is fitted as standard. The maximum data acquisition rate typically used is

2 kHz.

Tests are defined by a sequence of steps, each step containing set-point, data recording rates

and alarm level information. Set-points may be adjusted by step change or ramp. The test

sequence is followed unless interrupted by the operator or an alarm. Set-points may also be

adjusted manually using on screen toggles.

TE 69 LOAD SCANNER

Technical SpecificationsContact Geometry: Crossed Cylinder on Cylinder

Crossed Flat on FlatPin on PlateIndenter on Plate

Maximum Load: 2000 NTooling Clamps Unheated: 3.2 mm diameter and 12 mm diameterTooling Clamps Heated: 3.2 mm diameter and 12 mm diameterCylinder Length: 175 mmWear Scar Length – Load Scanner: 100 mmWear Scar Length – Pin on Plate: 75 mmMaximum Stage Travel: 75 mm (each)Lever Arm Ratio: 5:1Maximum Sliding Speed: 0.1 m/sMaximum Repetition Rate: 0.3 HzLubricant Bath Temperature: Ambient to 250°CUpper Rod Specimen Temperature: Ambient to 600°C (dry tests only)Lower Rod Specimen Temperature: Ambient to 600°C (dry tests only)Traverse Actuator: 0.37 kW balls screw actuatorMotor Drive: a.c. Vector Drive

Automatically Controlled Parameters Traverse Speed

Bath Temperature (lubricated tests)Upper Specimen Temperature (dry tests)Lower Specimen Temperature (dry tests)Test Duration

Mechanically Adjusted Parameters Starting Load

Rate of Loading

Recorded Parameters Traverse Speed

LoadStroke DisplacementFriction ForceBath Temperature (lubricated tests)Upper Specimen Temperature (dry tests)Lower Specimen Temperature (dry tests)Number of CyclesTest DurationFriction CoefficientSliding Distance

ServicesElectricity: 220/240V, single phase, 50 Hz, 3 kW

110/120 V, single phase, 60 Hz, 3 kW