Task:
To control the ongoing production of cylindrical shafts, a Measuring station produce.
The following requirements are placed on the measurement:
- Diameter range from 4 mm to 120 mm
- Lengths from 5 mm to 700 mm
- Extremely short measuring times
- Easy handling
- Subsequent automation of the measurement process must be possible
- Measurement results must be automatically logged and evaluated
- Measuring accuracy in the micro range
The following measurements must be carried out:
- Diameter
- Concentricity
- Cylindricity
- Length measurement
Description of the laser measuring device
The basis is a laser scanner, the core of which is a helium-neon tube that emits a sharply focused, parallel laser beam.
This makes it possible to carry out fast measurements with high accuracy on the workpiece without having to adjust anything. diameters and edges are measured, and bevels, curves and roundness measurements are also possible as options.
Specification of the standard version of the measuring station
Measuring ranges:
- Diameter: 4 mm to 120 mm
- Length: 5 mm to 700 mm
Measuring time:
- Diameter: < 1 sec.
- Lengths: < 10 sec.
Measuring accuracy:
- Diameter: 0.005 mm
- Lengths: 0.05 mm
Solution
On a solid base frame with drawers for various measuring devices and tools, there is a sliding carriage on which the test specimen holders sit.
This sliding carriage is moved past a laser beam by means of an adjustable motor. The travel distance is measured using a glass scale with an accuracy of 5 micrometers and the exact position is displayed digitally.
Adjustable cantilever arms on hardened and ground shafts are used to hold the test specimens. In these cantilever arms there are two center punch tips for holding the shafts to be tested between the centers. In order to be able to measure shafts without a center, roller blocks are fitted in addition to the center punches, on which the shafts are placed. The center punches and roller blocks are connected to each other via a toothed belt system and are driven by an adjustable motor for concentricity measurement.
