Liebherr-verzahntechnik Gmbh

Gerd Sulzer

Dieter Wiener

Jurgen Pomp

Rudolf Skyba, Deceased

A tool for fine machining the tooth flanks of pretoothed gearwheels is described. The flanks of the gearwheel are subjected to a worm-shaped tool by the hobbing method. The tool is made of an elastic synthetic material with embedded granular grinding material. It is advantageous for the worm-shaped tool to be lined up with a conventional grinding worm on a tool spindle. The microfinish of the gearwheel, i.e. the polishing, can then take place on one and the same machine directly following the grinding.

Machine tool for fine machining the tooth flanks of pretoothed gearwheels

A method is described for hob grinding helical gearwheels by continuous diagonal hobbing using a tool in the form of a substantially involute worm whose active length is greater than the length of the working area and whose center distance from the gearwheel is changed during its feed motion in the diagonal direction from the axial and tangential directions to generate lateral crowning. The pressure angle of the right or left flanks decreases continuously from a maximum value starting at one end of the worm toward the other end, whereby the maximum pressure angle of the right flanks at one end of the worm coincides with the minimum pressure angle of the left flanks, and vice versa.

Method for machining gearwheels

In a process and apparatus for tooth-flank grinding of gearwheels, the opposing flanks of two adjacent teeth are initially ground simultaneously. In the terminal stages of the process, each flank is ground separately. A slight rocking motion of the gearwheel, provided by pivoted pawl in an indexing wheel, applies the grinding tool first to one tooth flank and then to the other. Any undesirable rounding off of the tooth flanks occurring during simultaneous tooth flank grinding can thus be corrected.

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Wiggensbach, Germany

Gerd Sulzer