Grinding machine and grinding method
First Claim
1. A grinding machine comprising:
- a first grinding wheel comprises a grinding wheel having a grinding surface formed to be plane;
a second grinding wheel comprises a grinding wheel having a plurality of oblique grooves formed on a grinding surface thereof to be inclined relative to a wheel circumferential direction; and
a coolant supply device configured to supply coolant to a location at which the first and second grinding wheels grind a workpiece,wherein the plurality of oblique grooves are inclined at a predetermined angle relative to the wheel circumferential direction and are formed at equiangular intervals in such an arrangement that where one side intersection point is defined as an intersection point of each oblique groove and an extension line of one side edge parallel to the wheel circumferential direction of the contact surface and the other side intersection point is defined as an intersection point of each oblique groove and an extension line of the other edge, the other side intersection point of each oblique groove overlaps the one side intersection point of an oblique groove next to each such oblique groove by a predetermined overlap amount in the wheel circumferential direction, andin grinding the workpiece with the second grinding wheel, an infeed amount of the second grinding wheel against the workpiece and at least one of the inclination angle and the intervals of the oblique grooves are set so that the length in the wheel circumferential direction of the contact surface on the grinding surface of the second grinding wheel and the workpiece becomes shorter than the overlap amount.
1 Assignment
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Accused Products
Abstract
A grinding machine is provided with first and second grinding wheels selectively used in dependence on the steps of machining operations. The second grinding wheel is grooved so that at least one oblique groove vertically crosses a contact surface on which a grinding surface of the second grinding wheel contacts with a workpiece, and thus, is capable of releasing a dynamic pressure in coolant generated between the grinding surface and the workpiece since coolant supplied from over the contact surface flows out from both of the upper and lower sides of the contact surface through the at least one oblique groove. Since it does not occur that fluctuations in the dynamic pressure generated in coolant cause the distance between the second grinding wheel and the workpiece to be varied, the accuracy in grinding the workpiece with the second grinding wheel can be enhanced.
14 Citations
30 Claims
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1. A grinding machine comprising:
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a first grinding wheel comprises a grinding wheel having a grinding surface formed to be plane; a second grinding wheel comprises a grinding wheel having a plurality of oblique grooves formed on a grinding surface thereof to be inclined relative to a wheel circumferential direction; and a coolant supply device configured to supply coolant to a location at which the first and second grinding wheels grind a workpiece, wherein the plurality of oblique grooves are inclined at a predetermined angle relative to the wheel circumferential direction and are formed at equiangular intervals in such an arrangement that where one side intersection point is defined as an intersection point of each oblique groove and an extension line of one side edge parallel to the wheel circumferential direction of the contact surface and the other side intersection point is defined as an intersection point of each oblique groove and an extension line of the other edge, the other side intersection point of each oblique groove overlaps the one side intersection point of an oblique groove next to each such oblique groove by a predetermined overlap amount in the wheel circumferential direction, and in grinding the workpiece with the second grinding wheel, an infeed amount of the second grinding wheel against the workpiece and at least one of the inclination angle and the intervals of the oblique grooves are set so that the length in the wheel circumferential direction of the contact surface on the grinding surface of the second grinding wheel and the workpiece becomes shorter than the overlap amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A grinding machine comprising:
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a first grinding wheel comprises a grinding wheel having a grinding surface formed to be plane; a second grinding wheel comprises a grinding wheel having a plurality of oblique grooves formed on a grinding surface thereof to be inclined relative to a wheel circumferential direction; and a coolant supply device configured to supply coolant to a location at which the first and second grinding wheels grind a workpiece, wherein; the plurality of oblique grooves are inclined by a predetermined angle relative to the wheel circumferential direction and are formed on the grinding surface at equiangular intervals to open at both sides of the second grinding wheel so that a part of each oblique groove on one side of the second grinding wheel overlaps a part of a circumferentially adjoining oblique groove on the other side of the second grinding wheel by a predetermined overlap amount in the wheel circumferential direction; and in grinding the workpiece with the second grinding wheel, an infeed amount of the second grinding wheel against the workpiece and at least one of the inclination angle and the intervals of the oblique grooves are set so that the length in the wheel circumferential direction of the contact surface on the grinding surface of the second grinding wheel and the workpiece becomes shorter than the overlap amount. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A grinding machine comprising:
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a first grinding wheel comprises a grinding wheel having a grinding surface formed to be plane; a second grinding wheel comprises a grinding wheel having a plurality of oblique grooves formed on a grinding surface thereof to be inclined relative to a wheel circumferential direction; and a coolant supply device configured to supply coolant to a location at which the first and second grinding wheels grind a workpiece, wherein the sum of widths of adjoining oblique grooves which are within the contact surface on the grinding surface of the second grinding wheel and the workpiece and which exist on a cutting-plane line becomes constant at all times, the cutting-plane line being taken when radially cutting the second grinding wheel at an arbitrary position in the circumferential direction and in parallel to a wheel spindle of the grinding machine. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification