| Abstract: | Conclusion At the National Enterprise Carl Zeiss Jena (East Germany) an improved method of continuous sequential induction hardening of feed screws with highly accurate length was worked out.The method was introduced into production jointly with the firm AEG-Elotherm (West Germany), which designed the corresponding equipment and apparatus.By continuous measurement of the length during continuous sequential surface hardening and immediate computer processing of the results of measurements it is possible by manual control of the speed of the inductor to maintain the elongation of the screw within previously specified narrow limits corresponding to the negative correction of the pitch of the thread envisaged in its cutting.Experience accumulated in recent years shows that the required absolute linear dimension of screws can be maintained with an accuracy of ±0.17 mm, regardless of the length of the screw (within the limits 0.5–4.0 m).Further improvement of the process will be effected chiefly by automating its control which at present is carried out manually.National Enterprise Carl Zeiss Jena (East Germany). AEG-Elotherm, Remscheid. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 4–8, December, 1984. |
