tailieunhanh - Cảm biến trong sản xuất P19

Wear may be critical and therefore wear sensors are of interest. They should be able to determine the end of tool life reliably. There are several approaches, as discussed in Section . One of the main accuracy problems with automated machine tools is derived from the thermal stability. The temperature field in the machine structure changes according to the effect of several heat sources. The most important heat sources are very often the spindle bearings. | Fig. Tool life with high cutting speeds. Source kindly provided by B. Denkena University of Hannover Sensors in Manufacturing. Edited by . Tonshoff I. Inasaki Copyright 2001 Wiley-VCH Verlag GmbH 357 ISBNs 3-527-29558-5 Hardcover 3-527-60002-7 Electronic quently and more often than in conventional cutting Figure . Wear may be critical and therefore wear sensors are of interest. They should be able to determine the end of tool life reliably. There are several approaches as discussed in Section . One of the main accuracy problems with automated machine tools is derived from the thermal stability. The temperature field in the machine structure changes according to the effect of several heat sources. The most important heat sources are very often the spindle bearings. The monitoring of the bearing temperature is recommended because of the high investment that an HSC machine represents and the critical power losses with high spindle frequencies. The heating of fast-running main spindles can lead to an unstable state heating increases the pre-stressing of the spindle-bearing system which increases power losses and heating etc. Monitoring is therefore advisable. This can be done fairly easily and reliably by thermocouple sensors. Similar measuring devices might be advisable to monitor feed drive components such as spindle-nut systems and direct linear drives to ensure a tolerable increase in temperature. Micro-machining M. Weck RWTH Aachen Aachen Germany The manufacture of micro-components using high-precision machine tools so-called ultra-precision machines imposes new demands on integrated sensor systems. In micro-machining extremely filigree turning planing or milling tools are frequently used. In addition the machining forces are very low typically in the range below 1 N when natural diamond tools are used. Very few sensor systems meet the requirements for micro-machining. To determine process forces piezoelectric force sensors with very high .