Werkzeugmaschinenfabrik Oerlikon-buhrle Ag

Maag Gear-wheel & Machine Company Limited

Maag- Zahnrader & Maschinen Ag

Gerd R Sommer

Armin Sterki

Walter Naegeli

A method is disclosed in which only one working point or machining point on a machining tool, which in general can comprise a grinding wheel or disc, is in machining contact with a workpiece such as a gear blank during a machining operation. The position of this single working or machining point can be selectively chosen within a machining region of the grinding wheel or disk and can be prescribed to lie in a zone of fixed or variable radius of the grinding wheel or disk. This is achieved through at least one feed motion, in general a feed motion of the grinding wheel or disc, effected in addition to feed motions known per se in machining processes performed essentially according to the indexing generating method. This means that the machining contact point between the grinding wheel or disk and the gear blank does not wander on the grinding wheel or disk in correspondence with the generating feed motions but can be confined to a predeterminate region. It is nevertheless possible to displace this working or machining point in an orderly and programmed manner, i.e. under control, to optimally exploit the machining tool. In accordance with the method, the machining point can be guided along different types of machining lines, for example along lines which at least approximate tooth flank generatrices or along lines which at least approximate tooth traces or flank lines and which may be helical.

Method for production of involute gear tooth flanks

An apparatus is disclosed in which only one working point or machining point on a machining tool, which in general can comprise a grinding wheel or disc, is in machining contact with a workpiece such as a gear blank during a machining operation. The position of this single working or machining point can be selectively chosen within a machining region of the grinding wheel or disk and can be prescribed to lie in a zone of fixed or variable radius of the grinding wheel or disk. This is achieved through at least one feed motion, in general a feed motion of the grinding wheel or disc, effected in addition to feed motions known per se in machining processes performed essentially according to the indexing generating method. This means that the machining contact point between the grinding wheel or disk and the gear blank does not wander on the grinding wheel or disk in correspondence with the generating feed motions but can be confined to a predeterminate region. It is nevertheless possible to displace this working or machining point in an orderly and programmed manner, i.e. under control, to optimally exploit the machining tool. In accordance with the method, the machining point can be guided along different types of machining lines, for example along lines which at least approximate tooth flank generatrices or along lines which at least approximate tooth traces or flank lines and which may be helical.

Apparatus for production of involute gear tooth flanks

A method and apparatus are disclosed in which only one working point or machining point on a machining tool, which machining contact with a workpiece such as a gear blank during a machining operation. The position of this single working or machining point can be selectively chosen within a machining region of the grinding wheel or disk and can be prescribed to lie in a zone of fixed or variable radius of the grinding wheel or disk. This is achieved through at least one feed motion, in general a feed motion of the grinding wheel or disc, effected in addition to feed motions known per se in machining processes performed essentially according to the indexing generating method. This means that the machining contact point between the grinding wheel or disk and the gear blank does not wander on the grinding wheel or disk in correspondence with the generating feed motions but can be confined to a predeterminate region. It is nevertheless possible to displace this working or machining point in an orderly and programmed manner, i.e. under control, to optimally exploit the machining tool. In accordance with the method, the machining point can be guided along different types of machining lines, for example along lines which at least approximate tooth flank generatrices or along lines which at least approximate tooth traces or flank lines and which may be helical.

Method for production of envolute gear tooth flanks

A gear testing machine tests toothing characteristics such as tooth profile, tooth pitch or tooth helix angle and records deviations between desired and actual values on a test piece (10) which may be a gear, a worm etc. A radial carriage (16) is mounted on radial guideways (14) and is displaceable by means of a radial drive comprising a servomotor (16a), a tachogenerator (16b) and a position transducer (16d). In addition, a tangential carriage (26) and an axial carriage (30) are controllably displaceable by respective drives analogous to the radial carriage drive. The various drives are further connected to position regulators. The desired/actual deviations can be determined from a signal of a sensor (34) and correction values of the corresponding position regulators. At least one of the drives has a second closed loop control circuit comprising the servomotor (22a, 26a, 30a) of the respective drive and its associated position transducer (22d, 26d, 30d) and actual position values determined by another of said drives are inputted to said second circuit as a regulating variable therefore.

Gear testing machine

A gear tooth flank testing apparatus and method wherein there is provided a housing erectable upon a bed or the like of a gear cutting machine. A measuring feeler is moveably arranged at the housing by means of two cross-wire arranged carriages having associated drive and displacement path measuring devices. The measuring feeler is moveable along two coordinated axes intersecting the axis of the workpiece to be tested. A control and evaluation circuit moves the measuring feeler along a tooth flank of the workpiece and compares the actual settings of the measuring feeler with predetermined reference settings. In particular, at the housing there is arranged a feeler bolt which can be pressed in spaced relationship from the measuring feeler against two neighboring tooth flanks of the workpiece. The feeler bolt is guided to be freely moveable by means of two additional cross-wise arranged carriages parallel to both coordinate axes, and each such carriage likewise has operatively associated therewith a displacement path measuring device which is connected with the control and evaluation circuit.

Tooth flank testing apparatus and method of testing tooth flanks of gears

A method and test apparatus for testing the tooth flank profiles of large diameter gears, contemplates the provision of two contact elements and a measuring feeler, which is movable along a X-axis parallel to the connection line of both contact elements and a Y-axis extending transversely thereto. The contact elements are inserted into a respective tooth gap or space of a gear which is to be measured and the test apparatus is brought into a position where both of the axes are located in a plane normal to the gear axis. Then, there is determined the origin of a X-Y-coordinate system formed by both axis, the measuring feeler thereafter is moved along at least one tooth flank and the thus measured coordinates are compared with reference values. Importantly, the invention contemplates measuring the spacing between both of the contact elements and determining therefrom the spacing of the coordinate origin from the gear axis.

Method and test apparatus for testing the tooth flank profile of large

A measurement sensing device has a probe element that is displaced by an object to be measured and is acted on by an electric motor when in its displaced position to control the pressure with which it bears on the object. A control circuit for varying the standstill torque of the motor comprises means for compensating for variations in any biasing force applied to the probe element by its mounting, means for compensating for weight effects acting in the direction of measurement, and means for adjusting the predetermined value of the bearing pressure.

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Dietikon, Switzerland

Gerd R Sommer