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The DN 33 Draw Strip/Draw Bead Friction Tester comprises a long stroke electro mechanical ball screw actuator mounted horizontally on a steel bed plate in line with a tooling fixture. The actuator has an integral LVDT for displacement measurement and is controlled by means of a standard a.c. vector drive with encoder feedback
The tooling fixture comprises two articulated arms, each carrying one half of a draw tool. The arms are connected to a fixed point on the machine bed-plate by means of a force transducer, in such a way as to measure the combined drawing force on the arms. The clamping force on the draw tool is by means of a hydraulic cylinder with force transducer feedback and controlled by means of a proportional control valve.
The standard specimen is a long strip of material of up to 25 mm width, which is connected to the actuator by means of standard mechanical grips.
A variety of different tools may be used, providing a range of different sliding contacts including flat on flat area contact, cylinder on flat line contact and draw bead contact. In all these configurations, the friction force measured is the combined force on both surfaces. An alternative cylinder on flat line contact configuration is available in which the cylindrical tool is replaced by a roller, allowing sliding on one surface and rolling on the other. A roller bead test assembly is also available in which the rollers may either be unclamped and allowed to roll freely, thus generating only the deformation force, or clamped, thus generating combined deformation and sliding friction force.
Control and data acquisition is provided by means of Phoenix Tribology’s standard COMPEND 2000 control and data acquisition system in conjunction with a 16 bit Data Translation control and data acquisition card. The maximum data acquisition rate typically used is 2 kHz.
| Drawing Speed |
| Specimen Load |
| Drawing Speed |
| Specimen Load |
| Drawing Friction Force |
| Drawing Displacement |
| Drawing Speed: | 200 to 2,000mm/min |
| Speed Resolution: | +/- 1% of maximum speed |
| Specimen Force: | 25 kN maximum |
| Drawing Force: | 20 kN maximum |
| Tool Size: | 35 mm x 45 mm (typical) |
| Tool Finish: | 0.05 - 0.02 microns Ra |
| Contact Conditions: | Flat on Flat |
| Cylinder on Flat (sliding) | |
| Cylinder on Flat (rolling) | |
| Draw Bead | |
| Fixed Bead/Roller Bead | |
| Specimen Size: | 500 mm long x 25 mm wide |
| Load Cell: | 30 kN (fatigue rated) |
| Power Pack: | 2 l/min at 210 bar |
Copyright © 2004
Phoenix Tribology Ltd.