Back to results
US 10,322,489 B2Granted
Cam grinding machine and cam grinding method
AssigneeJtekt Corporation
InventorsYoshihiro Mizutani, Satoshi Abeta, Masaharu Inoue
Life of this patent
Estimating the term…
Abstract
A cam grinding method includes: a common base circle portion setting step of obtaining an angular range of a common surface based on first cam lift data of a first cam and second cam lift data of a second cam; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and a common base circle portion traverse grinding step of, after the second cam grinding step, moving a grinding wheel in a traverse direction to perform spark-out of an unground part remaining at the boundary between the first and second cams.
Claims9
A cam grinding machine that grinds a composite cam, wherein
- the composite cam includes
- a first cam that has a first base circle portion having a first radius and a fixed lift height from a central axis to its outer peripheral surface, and a first cam portion having a varying lift height from the central axis to its outer peripheral surface, and
- a second cam that has a second base circle portion having the first radius and the fixed lift height from the central axis to its outer peripheral surface, and a second cam portion having a varying lift height from the central axis to its outer peripheral surface,
- the first cam and the second cam are coaxially disposed so as to adjoin each other in an axial direction,
- the first cam and the second cam have different shapes from each other, the shape of the first cam corresponding to first cam lift data and the shape of the second cam corresponding to second cam lift data, and
- at least a part of the outer peripheral surface of the first base circle portion and at least a part of the outer peripheral surface of the second base circle portion are flush with each other to form a common base circle portion, the cam grinding machine comprising:
- a base unit that serves as a base;
- a spindle device placed over the base unit and including a workpiece rotating device that rotatably supports the composite cam about the central axis;
- a grinding wheel device placed over the base unit and including a rotary grinding wheel;
- a traverse moving device that can reciprocate the grinding wheel relative to the composite cam in the axial direction;
- a plunge moving device that can move the grinding wheel relative to the composite cam in a direction crossing the axial direction;
- and
- a control device that controls the workpiece rotating device, the traverse moving device, and the plunge moving device;
- wherein
- the control device includes
- a common base circle portion setting unit that obtains an angular range of the common base circle portion formed by at least the part of the outer peripheral surface of the first base circle portion and at least the part of the outer peripheral surface of the second base circle portion being flush with each other, based on the first cam lift data in which a lift with respect to a rotation angle of the first cam is set, and the second cam lift data in which a lift with respect to a rotation angle of the second cam is set,
- a first cam grinding unit that controls the plunge moving device and the traverse moving device to move the grinding wheel to a position facing the outer peripheral surface of the first cam, and controls the workpiece rotating device and the plunge moving device to grind the first cam,
- a second cam grinding unit that, after the grinding of the first cam, controls the plunge moving device and the traverse moving device to move the grinding wheel to a position facing the outer peripheral surface of the second cam, and controls the workpiece rotating device and the plunge moving device to grind the second cam, and
- a common base circle portion traverse grinding unit that, after the grinding of the second cam, controls the traverse moving device to move the grinding wheel from a position of the second cam to a first position beyond a boundary between the first and second cams in a traverse direction in a first direction, controls the workpiece rotating device to rotate the composite cam within the angular range of the common base circle portion with respect to the grinding wheel to perform a first traverse grinding of the common base circle portion, controls the traverse moving device to move the grinding wheel from a position of the second cam to a second position beyond the boundary between the first and second cams in the traverse direction in a second direction opposite to the first direction, and controls the workpiece rotating device to rotate the composite cam within the angular range of the common base circle portion with respect to the grinding wheel to perform a second traverse grinding of the common base circle portion.
16 more elements
A cam grinding method for grinding a composite cam, wherein
- the composite cam includes
- a first cam that has a first base circle portion having a first radius and a fixed lift height from a central axis to its outer peripheral surface, and a first cam portion having a varying lift height from the central axis to its outer peripheral surface, and
- a second cam that has a second base circle portion having the first radius and the fixed lift height from the central axis to its outer peripheral surface, and a second cam portion having a varying lift height from the central axis to its outer peripheral surface,
- the first cam and the second cam are coaxially disposed so as to adjoin each other in an axial direction,
- the first cam and the second cam have different shapes, the shape of the first cam corresponding to first cam lift data and the shape of the second cam corresponding to second cam lift data, and
- at least a part of the outer peripheral surface of the first base circle portion and at least a part of the outer peripheral surface of the second base circle portion are flush with each other to form a common base circle portion, the cam grinding method comprising:
- a common base circle portion setting step of obtaining an angular range of the common base circle portion formed by at least the part of the outer peripheral surface of the first base circle portion and at least the part of the outer peripheral surface of the second base circle portion being flush with each other, based on the first cam lift data in which a lift with respect to a rotation angle of the first cam is set, and the second cam lift data in which a lift with respect to a rotation angle of the second cam is set;
- a first cam grinding step of performing plunge grinding of the first cam with the grinding wheel based on the first cam lift data,
- a second cam grinding step of, after the first cam grinding step, performing plunge grinding of the second cam with the grinding wheel based on the second cam lift data;
- and
- a common base circle portion traverse grinding step of, after the second cam grinding step, moving the grinding wheel from a position of the second cam to a first position beyond a boundary between the first and second cams in a traverse direction in a first direction, a rotating the composite cam within the angular range of the common base circle portion with respect to the grinding wheel to perform a first traverse grinding of the common base circle portion, moving the grinding wheel from a position of the second cam to a second position beyond a boundary between the first and second cams in a traverse direction in a second direction opposite to the first direction, and-rotating the composite cam within the angular range of the common base circle portion with respect to the grinding wheel to perform a second traverse grinding of the common base circle portion.
8 more elements
Dependencies are inferred from the claim text.