Abstract
The possibility of using conventional cutters, in which the super-hard materials Hexanit R acts as the material for the diamond knurling of shaft sections made of steel 10, has been investigated. It is recommended to use damaged replaceable tips with super-hard material as tool blanks, which requires either re-grinding or recycling. The possibility of restoring the working properties of such cutters by regrinding is established, provided that the core of the tool is precisely located relative to the axis of rotation of the workpiece. The design of tooling in the form of a mandrel for fixing the tool on a lathe is proposed. It allows flexible clamping of the tool to the workpiece. Design and operational processing parameters are recommended for diamond knurling using tips made of superhard Hexanit-R material: knurler radius –5 mm; clamping forces – 200 N; feed – 0.05 mm/rev; workpiece rotation frequency – 630 rpm. According to the knurling results, the roughness was Ra 0.8 μm when lubricated with I-20A mineral industrial oil. An increase in the number of passes greater than four did not lead to a significant improvement in surface roughness. No signs of wear, damage to the working surface of the tool after an operating time of 40 hours were found.
Highlights
In the conditions of repair shops, in most cases there is a limited list of metal-cutting equipment
Design and operational processing parameters are recommended for diamond knurling using tips made of superhard Hexanit-R material: knurler radius – 5 mm; clamping forces – 200 N; feed – 0.05 mm/rev; workpiece rotation frequency – 630 rpm
Materials and methods of research The process of diamond smoothing is carried out by diamond tips, in which the material for the working core is used superhard materials (SHM) based on polycrystalline diamonds (PCD), the microhardness of which is in the range of 50–100 GPa
Summary
In the conditions of repair shops, in most cases there is a limited list of metal-cutting equipment. The process of using modern methods of diamond smoothing is attractive It allows, in the presence of only a lathe, to perform finishing operations for cylindrical sections of shafts. It consists of a mandrel and a working core. The first group is represented by single-crystal from both natural and synthetic diamonds They are characterized by excessively high microhardness, good thermal conductivity, but limited thermal stability. More widely compared with natural ones, common monocrystalline synthetic diamonds (SD), for example, AST brand They are not much inferior in microhardness, having similar parameters both in heat resistance – 600–700 °C, and in thermal conductivity. It most widely represented of smoothers with the brand of the working core ASPK-3, the cost of which is 16–25 c.
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