Numerically controlled grinding machine
First Claim
1. A feed controller for a numerically controlled grinding machine wherein a fast forward mode, an air-cut feed mode and a grinding feed mode are sequentially performed to effect relative feed movements between a grinding wheel and a workpiece through different feed amounts at different feed speeds, respectively, said feed controller comprising:
- a contact detector for producing a contact signal upon contact of said grinding wheel with said workpiece;
air-cut feed remainder detection means including a counter responsive to feed command pulses for detecting a feed remainder in said air-cut feed mode based upon an air-cut feed amount predetermined for said air-cut feed mode and an actual feed amount through which said relative feed movement in said air-cut feed mode is effected until said contact detector generates said contact signal, each of said feed command pulses being indicative of a unit feed distance in said relative feed movement between said grinding wheel and said workpiece; and
feed mode change means responsive to said contact signal from said contact detector for changing the feed mode of said relative feed movement in such a manner as to effect said relative feed movement through said feed remainder at a slower speed than an air-cut feed predetermined for said air-cut feed mode.
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Accused Products
Abstract
In a numerically controlled grinding machine of the type which is adapted to perform a machining operation on the basis of the feed amounts specified as relative amounts in various modes of different grinding wheel feed speeds, a feed controller comprising in combination: a contact detector adapted to produce a contact signal upon detection of contact of the grinding wheel with a workpiece; a non-grinding feed remainder detector including a counter for counting feed control distribution pulses to detect the remainder of a preset feed amount at least in a non-grinding mode from a variation in the count value of the counter during a period between a time point of starting the non-grinding mode and a time point of receiving the contact signal from the contact detector; and a feed mode changing means adapted to change the feed mode of the grinding wheel in such a manner as to effect the remainder of the non-grinding feed at a speed lower than that of the non-grinding mode in response to the contact signal from the contact detector.
15 Citations
4 Claims
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1. A feed controller for a numerically controlled grinding machine wherein a fast forward mode, an air-cut feed mode and a grinding feed mode are sequentially performed to effect relative feed movements between a grinding wheel and a workpiece through different feed amounts at different feed speeds, respectively, said feed controller comprising:
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a contact detector for producing a contact signal upon contact of said grinding wheel with said workpiece; air-cut feed remainder detection means including a counter responsive to feed command pulses for detecting a feed remainder in said air-cut feed mode based upon an air-cut feed amount predetermined for said air-cut feed mode and an actual feed amount through which said relative feed movement in said air-cut feed mode is effected until said contact detector generates said contact signal, each of said feed command pulses being indicative of a unit feed distance in said relative feed movement between said grinding wheel and said workpiece; and feed mode change means responsive to said contact signal from said contact detector for changing the feed mode of said relative feed movement in such a manner as to effect said relative feed movement through said feed remainder at a slower speed than an air-cut feed predetermined for said air-cut feed mode. - View Dependent Claims (2, 3, 4)
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Specification