Hurth Maschinen Und Werkzeuge G.m.b.h.

Carl Hurth Maschinen- Und Zahnradfabrik Gmbh & Co.

Carl Hurth, Maschinen- Und Zahnradfabrik

Gerhard Reichert

Herbert Loos

Manfred Erhardt

Josef Lohrer

Manfred Heckmaier

To manufacture grinding members covered with extremely hard abrasive granules, instead of a base member of steel, a commercially available grinding tool of a corresponding shape and size made of a porous ceramic material is used as the base member. The base member is coated with an adhesive at the areas to be covered, the abrasive granules are applied and are pressed into the pores of the ceramic material; finally the adhesive is allowed to harden.

Grinding tool and the like made of a ceramic material coated with

A method for the precision working of the tooth flanks of particularly hardened gears (workpiece W) with a gearlike tool, the tooth flanks of which tool have an abrasive surface and which rotates in mesh with the workpiece (W). In order to avoid damage to the tool caused by remaining burrs or the like in the tooth system of the workpiece (W), a twin tool with axially spaced similar tools is utilized, individual ones of the similar tools are used one after the other. The first tool removes thereby first the remaining burrs and the like and the second tool performs thereafter the actual precision working.

Method for the precision working of the tooth flanks of particularly

Tool for the precision working of tooth flanks of hardened gears

A method for the manufacture or machining of the tooth system of straight or helically toothed, externally or internally toothed, nonhardened or hardened workpiece with a toothed tool, the tooth flanks of which are coated with a cubic boron nitride (CBN). The workpiece and the tool roll along with a single-flank contact and are supported by a guide-gear pair which also roll along with a single-flank contact. The contacting flanks of the workpiece-tool pair are the mating flanks for the contacting flanks of the guide-gear pair. To protect the CNB-coating, the tool is already driven at a speed which is necessary for an optimum chip removal before the tool tooth flanks start to work on the workpiece tooth flanks.

Method for the precision working of the flanks of gears with a

Apparatus for the manufacture or machining of gears with a toothed tool having abrasive working surfaces, in which workpiece and tool, during rotation, are supported by the tooth system of a guide-gear pair. The apparatus works with a single-flank contact between workpiece and tool, whereby for changing the tooth flanks which contact one another, one member of the drive chain can be rotated relative to the other members a preselectable or adjustable amount.

Apparatus for the manufacture or machining of gears by rolling on a tool

An apparatus and tool for the precision working of gears, particularly by a gear shaving process. The process involves the step of changing the direction of rotation between the workpiece and the tool approximately starting with half of the advance path and the smallest distance between the axes. The optimum condition occurs when the direction of rotation is changed prior to reaching the smallest distance between the axes and the advance is directed at a right angle with respect to the axis of the workpiece or tool. The tool is rotatably supported on a spindle as is the workpiece. The workpiece is driven relative to the tool to advance same relative to the tool. Control devices are provided for controlling the movement of the workpiece relative to the tool. The tool has grooves which extend from the addendum to the dedendum and form cutting edges and the flanks of the teeth have concaved surfaces.

Apparatus and tool for precision working, particularly shaving, of gears

A method for the precision working of gears, particularly by a gear shaving process. The method involves the step of changing the direction of rotation between the workpiece and the tool approximately starting with half of the advance path and the smallest distance between the axes. The optimum condition occurs when the direction of rotation is changed prior to reaching the smallest distance between the axes and the advance is directed at a right angle with respect to the axis of the workpiece or tool. The tool is rotatably supported on a spindle as is the workpiece. The workpiece is driven relative to the tool to advance same relative to the tool. Control devices are provided for controlling the movement of the workpiece relative to the tool. The tool has grooves which extend from the addendum to the dedendum and form cutting edges and the flanks of the teeth have concaved surfaces.

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Puchheim, Germany

Gerhard Reichert