The capabilities of high-porous sintercorundum wheels are shown at the spark-out stage using the non-parametric statistics method, which has advantages compared to parametric evaluations when the conditions of homoscedastic and normalcy distribution are violated. Univariate distributions of frequencies by medians have shown that sparking-out of the high-speed plate provides the most significant decrease of median flatness deviation (up to 1.25-1.3 times), with the spark-out pass j = 6 for the R9М4К8 plate, and j = 8 for the R12F3К10М3 plate. For the R12F3К10М3 plate, the parameter R max is decreased by one categorical magnitude (CM) according to GOST 2789-73, and the parameter R a is decreased within the CM range. For the R9М4К8 plate, the heights R a and R max are characterized by the values 0.05 and 0.32 mcm respectively, and lie in the range of CM. The specified number of spark-out passes is also taken into consideration when the accuracy of the process is assessed.
Рассмотрена возможность управления шлифованием сборных пластин из быстроре-жущей стали различной жесткости для повышения производительности процесса, снижения трудоемкости и сроков технологической подготовки при обеспечении задан-ного микрорельефа поверхности. Для повышения эффективности робастного проекти-рования шлифовальной операции с помощью программы Design-Expert 8.0.4.1 выпол-нен поиск моделей I многомерного дисперсионного анализа и реализована многопара-метрическая оптимизация процесса с учетом служебного назначения инструмента. Получены оптимальные режимы чистового шлифования (наивысшей производитель-ности) сборных инструментов на каждом уровне жесткости. Установлено, что выбор оптимального режима шлифования позволяет повысить производительность процесса для быстрорежущих пластин с продольной переменной жесткостью до 1,7 раза, а с по-перечной -1,3 раза.Ключевые слова: шлифование быстрорежущих пластин, многопараметрическая оп-тимизация, программа Design-Expert 8.0.4.1, технологические факторы (параметры), регрессионные модели. This paper describes the possibility of managing the grinding process of built-up plates made of high-speed steel in order to improve performance, reduce labour intensity and the length of technological preparation, while guaranteeing the specified quality of the microrelief. To increase efficiency of robust design of grinding operations, the authors use Design-Expert 8.0.4.1 software to search for Models I of the multivariate analysis of variance. Multiparametric optimization of the process with regard to the service function of the tool is performed. The optimal grinding conditions for finish grinding (highest efficiency) of built-up tools for each level of rigidity are obtained. It is established that by selecting the optimal grinding conditions, it is possible to increase the efficiency of the process up to 1.7 times for high-speed plates with variable longitudinal rigidity and up to 1.3 times for high-speed plates with variable transversal rigidity.
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