THE IMPROVEMENT OF QUALITY OF HARD-ALLOY TOOLS AND PARTS BY MEANS OF CREATION OF SPECIFIED LEVEL OF RESIDUAL STRESS IN THE SURFACE LAYER


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Abstract

The article covers the issues of ensuring quality of hard-alloy tools and parts when producing them by means of rational use of ultrasonic fluctuations energy. It is well-known that one of the key indicators of quality of the surface layer of parts or tools is the lack of stretching residual stresses. It is especially important for the tools used for high-speed processing of aluminum alloys blank parts which are not exposed to the drawing of wear resistant coatings, and also for the crown bits and various hard-alloy parts which are widely used in modern machines and mechanisms. As a rule, the blank parts to be produced are processed by grinding at final stages of technological process, after which the stretching residual stresses are inevitable. For their relaxation, thermal treatment or natural aging is used in the production that increases the production cycle and the cost of production. For this purpose, the authors offered to use the ultrasonic field energy; in this connection, special installations were developed and the researches were conducted. During the research, the regression dependences of residual stresses on the parameters of thermal power intensity (the components of cutting forces and the contact temperature in the zone of flat diamond grinding of samples made of ultra finely-divided hard alloy) and the elements of processing mode (the longitudinal conveying speed and the cutting depth) were received. The residual stresses were controlled by means of domestic “Rikor-4” refractometer.. During processing, the authors carried out the assessment and the structural phase changes in the surface (using the x-ray measuring “Rikor-7” complex). The results of researches allowed to determine the velocity of ultrasonic relaxation and the elements of its mode.

About the authors

Evgeny Stepanovich Kiselyov

Ulyanovsk State Technical University, Ulyanovsk

Author for correspondence.
Email: kec.ulstu@mail.ru

Doctor of Engineering, Full Professor, professor of the department «Engineering technology»

Russian Federation

Mikhail Vadimovich Nazarov

Ulyanovsk State Technical University, Ulyanovsk

Email: nazarov.mv@inbox.ru

graduate student of the department «Engineering technology»

Russian Federation

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