MEASURING METHODS AND THEIR APPLICATION FOR DIAGNOSIS OF MACHINE TOOL SPINDLES |
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| David Burian, Petr Chvojka, Jiri Drobilek |
- Abstract:
- Over the last years a gradual but nevertheless sustained increase in the production of machine tool spindles can be observed, especially for the needs of the automotive as well as aerospace industry. Along with this trend an increasing demand for maximum precision of spindles as well as their long-term reliability is evident. It is therefore necessary for the producers and users of these machines to monitor the quality of spindles. As for the producers, it is paramount that they manufacture products of high quality and in this way minimize both the financial loss incurred by complaints from customers and the loss of good reputation. As for the users of these machines, it is necessary that they maintain the required precision parameters in manufacturing and that they are able of suitable planning of their machinery maintenance. The requirements for the geometric quality and surface roughness are today commonly in the order of micrometers. Consequently, it is necessary to adjust machine tools and their components, especially spindles, to these requirements. The goal of appropriate assessing of the quality and the capability of long-term reliability of the spindle with a high standard of precision can be achieved only on condition of adequately accurate check. The following article describes a method and a measuring system which meets the above-mentioned requirements using a combination of several measuring methods and careful analysis including statistical evaluation. The basis of the method described is careful measurements of spindle vibration on the stator part of the spindle together with measurement of the arbor movement by means of proximity contactless probes. The arbor is clamped into the rotor of the spindle. Next, temperature in several places on the spindle and the rotating speed is measured including the angular position of the rotor. The data obtained in this way are subsequently analyzed using a variety of methods. The results are both scalar data and data depicted in various types of graphs. Using statistical methods, it is possible to determine limit values for miscellaneous types of spindles. These values can be compared with a next spindle under the test and can be plotted and highlighted in the report. The described method has been applied to a test rig developed in the Research Centre of Manufacturing Technology (RCMT) in cooperation with a producer of spindles and machine tools. The test rig is being used for final inspection of spindles in day-to-day operation. The presented article also includes a case study which demonstrates the practical applicability of methods used.
- Keywords:
- final inspection, spindle, error motion, diagnostics, geometric accuracy of axes of rotation
- Download:
- IMEKO-TC14-2013-42.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC14
- Event name:
- TC14 ISMQC 2013
- Title:
11th International Symposium on Measurement and Quality Control
- Place:
- Cracow and Kielce, POLAND
- Time:
- 11 September 2013 - 13 September 2013