Patent ID: 6648735
Filing Date: 2003-11-18
Classification: B24B

Abstract:
A method for abrading both faces of a work piece in an abrasive machine including:a rotatable lower abrasive plate; a rotatable upper abrasive plate being provided to face said lower abrasive plate so as to clamp the work piece with said lower abrasive plate; a cylinder unit having pressure chamber and a rod from which said upper abrasive plate is suspended, said cylinder unit moving said upper abrasive plate in a vertical direction; and said method comprising: varying the pressure in said pressure chamber to provide different pressures for different abrading process, said step of varying the pressure in said pressure chamber comprising the steps of: adjusting the pressure of said pressure chamber of said cylinder unit in a first abrading process so as to apply a first pressure to the work piece via said upper abrasive plate without applying the full weight of said upper abrasive plate; and readjusting the pressure of said pressure chamber in a second abrading process so as to apply a second pressure which is higher than the first pressure to the work piece via said upper abrasive plate without applying the full weight of said upper abrasive plate.