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US 4,635,404 AGranted
Apparatus for machining a spur gear by means of a rotating gearlike tool
AssigneeReishauer AG
InventorWalter Wirz
Life of this patent
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AssigneeReishauer AG
InventorWalter Wirz
Estimating the term…
In a process for machining a spur gear by using a grinding worm having a curved tooth thickness smaller than the final measurement of the curved tooth gap of the spur gear to be produced, the grinding worm is first directed radially towards the spur gear until the desired distance between the axes is reached. Subsequently, a relative circular feed movement is carried out consisting of a positive or negative additional rotating movement of the gear or the worm. This additional rotating movement is superimposed on the corresponding basic revolution of the gear or the worm. In this way, first one flank and subsequently the other flank of each gear tooth is machined to its final dimension. With this process, a full linear contact exists between the grinding worm and the tooth flank of the gear during roughing independent of the amount of material to be machined. Due to the existing play, an effective cooling is possible so that high grinding outputs can be achieved.
An apparatus for grinding the teeth of a rotating cylindrical spur gear workpiece comprising at least one rotatable worm shaped tool, drive means for rotating one of said workpiece and tool, feed means for radially moving said workpiece and tool relatively toward and away from each other, additional means for producing an additional rotational movement of one of said workpiece and tool when the axes of said workpiece and tool are a desired distance apart with the worm shaped tool at full depth relative to the teeth of the workpiece and with the axes of said workpiece and tool crossing each other at an angle smaller than 90.degree. to carry out a machinging operation on said teeth, measuring means for continuously measuring said additional rotational movement during said machining operation to continuously monitor the machining operation and input means for limiting said additional rotational movement upon reaching predetermined teeth dimensions.
Dependencies are inferred from the claim text.