Information Control Problems in Manufacturing Technology by D. E. Hardt

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By D. E. Hardt

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Motor which drives the main shaft. The signal of armature current is taken as the output signal from a kind of linear stochastic systems. Keywords. — Machine tools; inprocess monitoring; identification; numerical control; stochastic systems; Kaiman filters; data acquisition; transfer functions. Introduction As the prediction of breakage of chipping of cutting tool in machining process is very difficult, current industrial practice invol­ ves changing tools after failures have occur­ red. Therefore, it is necessary to detect the breakage of cutting tools automatically in machining processes.

The results from the correlation studies carried out show that it is possible to develop meaningful relationships between variables using normal operating data. These results also provide a better understanding of the conditioning process. However, they do not allow the development of suitable discrete models which can be used to implement better control strategies. It was therefore decided to carry out tests which involved the injec­ tion of a force signal into the three term controller which controlled the combustion air flow rate and hence the heat input to zone 1.

3. A typical moment curvature (M-K) relation­ ship for a strain-hardening material. Shape Control in Metal Bending Processes of the loaded sheet in air-bending can be found by relating the local moment in the sheet to the local curvature and then integrating over the arc-length of the material to find the total shape or angle. The unloaded angle is similarly found by integrating the local change in curvature ΔΚ = Kj - 1L· over the sheet arc-length. Regardless of the process in use or the control method used, the M-K relationship is central to proper control of metal bending.

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