With the center position CP of a support shaft 6 supporting a grinding wheel 4 being a reference, a provisional grinding start position S0′ for a first workpiece 2 is calculated, based on a diameter ID of the first workpiece 2 before grinding, a diameter WD of the grinding wheel, a grinding completi
With the center position CP of a support shaft 6 supporting a grinding wheel 4 being a reference, a provisional grinding start position S0′ for a first workpiece 2 is calculated, based on a diameter ID of the first workpiece 2 before grinding, a diameter WD of the grinding wheel, a grinding completion position S4 on the first workpiece after the grinding, and an actual grinding start position S0 of the grinding wheel before grinding in second and subsequent grinding. S0 is determined by performing the grinding by moving the grinding wheel from S0′ and by moving the grinding wheel away from the first workpiece by a distance corresponding to S4 near the grinding completion position S4. S0′ is set by a calculation, S0′=ID−WD−S4−Sα, considering an allowance Sα between S0 and S0′.
대표청구항▼
1. A grinding machine comprising a grinding wheel configured to grind a workpiece, and a grinding wheel control system configured to move the grinding wheel relative to the workpiece, the grinding machine comprising: a first control section configured to calculate and set a provisional grinding star
1. A grinding machine comprising a grinding wheel configured to grind a workpiece, and a grinding wheel control system configured to move the grinding wheel relative to the workpiece, the grinding machine comprising: a first control section configured to calculate and set a provisional grinding start position S0′ of the grinding wheel relative to a first workpiece, with a center position of a support shaft supporting the grinding wheel being a reference, and based on a diameter ID of the first workpiece before grinding, a diameter WD of the grinding wheel, a grinding completion position S4 on the first workpiece after the grinding, and an actual grinding start position S0 of the grinding wheel relative to each of second and subsequent workpieces before grinding;a second control section configured to position the grinding wheel at the provisional grinding start position S0′ that has been set by the first control section;a third control section configured move the grinding wheel relative to the first workpiece from the provisional grinding start position S0′ to grind the first workpiece; anda fourth control section configured to fix the actual grinding start position S0 by moving the grinding wheel away from the first workpiece by a distance corresponding to S4, based on a gauge signal from an in-process gauge near the grinding completion position S4,wherein the first control section is configured to set the provisional grinding start position S0′ by a calculation, S0′=ID−WD−S4−Sαin view of a predetermined allowance Sα between the actual grinding start position S0 and the provisional grinding start position S0′. 2. The grinding machine according to claim 1, wherein the in-process gauge is configured to measure the diameter of the first workpiece to detect a grinding condition of the first workpiece, and the fourth control section is configured to fix the actual grinding start position S0 by moving the grinding wheel away from the first workpiece by the distance corresponding to S4, based on the gauge signal from the in-process gauge near the grinding completion position S4. 3. The grinding machine according to claim 1, wherein the allowance Sα is set in view of an error generated when arranging the grinding wheel to face the first workpiece to at the time of starting the grinding. 4. The grinding machine according to claim 1, wherein, when switching between a setting for a grinding of a certain workpiece and a setting for a grinding of a different workpiece, the fourth control section is configured to, in the grinding of the first workpiece at a beginning of the setting, moves the grinding wheel relative to the first workpiece from the provisional grinding start position S0′ to grind the first workpiece, and moves the grinding wheel away from the first workpiece by the distance corresponding to S4, based on the gauge signal from the in-process gauge near the grinding completion position S4, to fix the actual grinding start position S0, andin the grinding of each of the second and subsequent workpieces after the switching of the settings, repeat a process of moving the grinding wheel relative to the workpiece from the actual grinding start position S0 to grind the workpiece, and moving the grinding wheel to actual grinding start position S0 based on the gauge signal from the in-process gauge near the grinding completion position S4. 5. A grinding method using a grinding machine including a grinding wheel configured to grind a workpiece and a grinding wheel control system configured to move the grinding wheel relative to the workpiece, the grinding method comprising: a first step of calculating and setting a provisional grinding start position S0′ of the grinding wheel relative to a first workpiece, with a center position of a support shaft supporting the grinding wheel being a reference, and based on a diameter ID of the first workpiece before grinding, a diameter WD of the grinding wheel, a grinding completion position S4 on the first workpiece after the grinding, and an actual grinding start position S0 of the grinding wheel relative to each of second and subsequent workpieces before grinding;a second step of positioning the grinding wheel at the provisional grinding start position S0′ that has been set in the first process;a third step of moving the grinding wheel relative to the first workpiece from the provisional grinding start position S0′ to grind the first workpiece; anda fourth step of fixing the actual grinding start position S0 by moving the grinding wheel away from the first workpiece by a distance corresponding to S4 near the grinding completion position S4,wherein in the first step, the provisional grinding start position S0′ is set by a calculation, S0′=ID−WD−S4−Sαin view of a predetermined allowance Sα between the actual grinding start position S0 and the provisional grinding start position S0′. 6. The grinding method according to claim 5, wherein the diameter of the first workpiece is measured by an in-process gauge to detect a grinding condition of the first workpiece, and in the fourth step, the actual grinding start position S0 is fixed by moving the grinding wheel away from the first workpiece by the distance corresponding to S4, based on a gauge signal from the in-process gauge near the grinding completion position S4. 7. The grinding method according to claim 5, wherein the allowance Sα is set in view of an error generated when arranging the grinding wheel to face the first workpiece at the time of starting the grinding. 8. The grinding method according to claim 6, wherein, when switching between a setting for a grinding of a certain workpiece and a setting for a grinding of a different workpiece, in the fourth step, in the grinding of the first workpiece at a beginning of the setting, the grinding wheel is moved relative to the first workpiece from the provisional grinding start position S0′ to grind the first workpiece, and the grinding wheel is moved away from the first workpiece by the distance corresponding to S4, based on the gauge signal from the in-process gauge near the grinding completion position S4, to fix the actual grinding start position S0, andin the grinding of each of the second and subsequent workpieces after the switching of the settings, a process of moving the grinding wheel relative to the workpiece from the actual grinding start position S0 to grind the workpiece, and moving the grinding wheel to actual grinding start position S0 based on the gauge signal from the in-process gauge near the grinding completion position S4 is repeated.
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이 특허에 인용된 특허 (2)
Yoneda Takao (Nagoya JPX) Hotta Takayuki (Nagoya JPX), Method and apparatus for grinding a workpiece.
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