Показано влияние погрешностей положения стыковых поверхностей собираемых деталей про-тяженного осесимметричного корпуса на погреш-ность положения исполнительных поверхностей. Определены параметры законов распределения погрешностей положения стыковых поверхностей базовой детали. Отмечена взаимосвязь параметров базовой детали и сборки, причем установлено, что превалирующее влияние имеет торцовое биение. Обоснована необходимость коррекции технологии окончательной обработки торцов базовой детали.Ключевые слова: погрешность положения, стыковые поверхности, базовая деталь, исполни-тельные поверхности, закон распределения по-грешности, сборка.
Влияние угла профиля передней поверхности резца на степень деформации сдвига Impact of cutting face profile angle upon shear deformation degree It is established that cutting with gear-cutting and thread-cutting tools is not free that results in the increase of loading upon tool tips and their quick wear. The layers of metal cut are subjected to considerable shear deformation and also to other kinds of deformation. In this connection the wear character of a tool and its properties will change. There is considered a process of chip removal by trapezoidal and triangular cutters (as in case of metal cutting off with teeth of a hob may be used not three but two tool tips) and the impact of a cutting
Модификация схемы резания у червячных фрез для формообразования многозаходных винтовых выступов на прессовой оправкеОписана прогрессивная технология формообразования винтовых канавок на внутренних цилиндрических поверхностях с применением операции прессования через кольцевую матрицу на винтовой прессовой оправке. Представлены исследования и даны предложения по совершенствованию процесса зубофрезерования винтовых выступов на оправках с помощью фрез с модифицированной схемой резания.Ключевые слова: винтовые прессовые оправки; червячные фрезы; модифицированная схема резания; износ инструмента; режущие кромки.A.S. Yamnikov, Dr. Sc. Tech.An efficient technology for helical groove shaping on inner cylindrical surfaces with the use of a pressing operation through a ring matrix on a spiral press mandrel is described. There are presented investigations and offers are given to update spiral projection gear milling in mandrels with the aid of milling cutters with a modified cutting procedure.
ПРИСПОСОБЛЕНИЯ ДЛЯ ЗАКРЕПЛЕНИЯ ОБРАЗЦОВ ВО ВРЕМЯ ПРОВЕДЕНИЯ ЭКСПЕРИМЕНТАЛЬНЫХ ИССЛЕДОВАНИЙРассмотрены вопросы, связанные с конст-руктивными особенностями различных разрабо-танных и изготовленных приспособлений для кре-пления экспериментальных образцов на зубофре-зерных станках во время силовых и стойкостных исследований. Рассмотрены способы установки и крепления как экспериментальных образцов, так и приспособлений.Ключевые слова: эксперимент, сборная червячная фреза, зубчатая рейка, приспособление, конструкция, образец. N.D. Feofilov, E.S. Yanov, A.S. Yamnikov DEVICES FOR SAMPLE FASTENING DURING EXPERIMENTAL INVESTIGATIONSThe paper reports the consideration of problems connected with design peculiarities of devices for sample fastening on gear-milling machines during the investigation fulfillment of a gear milling process of cylindrical wheels with combined hob milling cutters. The essence of the problem is reduced to that the fulfillment of investigations directed to the definition of a hob durability term and also of the modes and a force of cutting upon real large cog-wheels is not always possible as on domestic engineering enterprises they are manufactured mostly with small-lot or limited production and their price is high. Therefore, it is offered to substitute expensive and long experiments for experiments with special samples. In the paper there are described designs and circuits of the installation of the devices developed for such samples. In conclusion there are shown test results and is made a conclusion of that the use of the devices offered allowed defining and correcting tool parameters, cutting modes, defining a tool durability period at the stage of technological preproduction of manufacturing large cog-wheels made of hardened steel.
Cited in the reference literature, empirical formula is usually acceptable for standard materials processed. When new materials have to repeat the experiments again. The article presents the analytical relationships derived from the generalization of the work of Russian and American scientists, in particular: VF Bobrov, NI Lvov, VS Kushner, a Merchant ME, Astakhov, V.P. These relationships relate the values of the components of the cutting force with time and the actual yield strength of the material being processed, making it much easier to calculate the components of the experiment of cutting force in turning based on the radius of curvature of the cutting edge and tool wear on the rear surface. Shrinkage factor chips taken approximately equal to one. Experimental verification showed acceptability found dependences for practical use, particularly important in the processing of materials of new brands.
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