Patent ID: 6379217
Filing Date: 2002-04-30
Classification: B23F,B24B

Abstract:
A process for grinding a pre-cut toothed workpiece, said workpiece having teeth with tooth flanks and being movable along a first axis and said workpiece being grinded by means of a cylindrical grinding worm, said grinding worm having a grinding worm path with flanks and being movable along a second axis, the process comprising the steps of:a) dressing said grinding worm with a dressing disc, said dressing disc having an active surface being coated with hard material grains and having a topography with a regularity, the dressing step including, rotating said grinding worm by means of a first servomotor, and rotating said dressing disc by means of a second servomotor, wherein said dressing disc makes a multiple number of revolutions during one revolution of said grinding worm; measuring a first rotation angle of said grinding worm by means of a first rotary encoder; measuring a second rotation angle of said dressing disc by means of a second rotary encoder; and coupling said first rotation angle of said grinding worm with said second rotation angle of said dressing disc, with one of an adjustable constant, a programmable variable ratio, and a stored stochastically changing ratio, wherein said topography is reproduced onto said grinding worm as a programmed pattern; b) bringing said grinding worm into contact with said teeth of said workpiece; and c) grinding said pre-cut toothed workpiece with said dressed grinding worm, the grinding step including, moving said workpiece along said first axis relative to said grinding worm; and moving said grinding worm along said second axis relative to said workpiece, so that each point on said tooth flanks matches a specific point on said flanks of said grinding worm path, wherein said grinding worm is moved along said second axis dependent on said first rotation angle such that said programmed pattern is reproduced onto said workpiece so that after grinding, a smooth running of said workpiece is achieved.