Journal
Scientific and technical journal of information technologies, mechanics and optics
UDK
Issue:2 (78)
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STRAIGHT COGS FORMATION FEATURES FOR CYLINDRICAL SPUR GEARS BY STEPPED GEAR-SHAPED CUTTER
Annotation
The complexity of cogged surfaces formation by traditional methods is high enough. Development of new, effective methods of their treatment is an issue of significant scientific and practical importance. A new method is developed: speed gearcutting of straight cogs of spur gears by skew gear-shaped cutter, which cogs are stepped along its own axis. After the technological system is set up, a continuous machine tool gearing is passed to the tool and workpiece. The tool also gets a radial displacement. Despite the absence of axial displacement of the workpiece and tool in general, cutting edge of the tool commits axial displacement, provided by tool design and the cutting kinematics. After reaching the desired depth of cutting, a single-phase tool moving along the workpiece is done. The surface calibration is supplied and processing errors are reduced. Each cog of the cutter has the opportunity to take part in the formation of any wheel cog. Stepped cutters of different design were created and manufactured; updated equipment was made based on vertical milling machine of 6Р13 model. Industrial testing of the developed method was performed on machine-building plant named after G. Musabekov. It was stated that cogs cutting by stepped cutter provides the 8-9th degrees of accuracy according to the state standard specification SSS 1643-81 and a significant reduction in time as compared with the traditional gear shaping. The special machine can cut gearing surfaces with the quality not lower than the 8th degree of accuracy.
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