Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1991-09-20
1993-03-30
Rose, Robert A.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51283E, B24B 910
Patent
active
051972298
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a numerically controlled chamfering apparatus for a glass plate. More particularly, the present invention relates to a numerically controlled chamfering apparatus for a glass plate wherein a numerical instruction indicating a shape resembling the shape of the peripheral edge of a glass plate is previously given, and a chamfering wheel is moved along the peripheral edge of the glass plate such as a window glass for an automobile on the basis of the numerical instruction to grind the peripheral edge of the glass plate to thereby perform the chamfering of the peripheral edge of the glass plate.
BACKGROUND TECHNIQUE
Heretofore, there has been known as a numerically controlled chamfering apparatus for a glass plate of this kind a chamfering apparatus disclosed in Japanese Unexamined Patent Publication 37040/1984. The numerically controlled chamfering apparatus for a glass plate comprises a fitting holder for setting a glass plate having a desired shape horizontally and a chamfering wheel provided at the upper side of the fitting holder so as to be movable to a desired position by two driving systems having an X axis and a Y axis intersecting the X axis perpendicularly, wherein the chamfering wheel comprises a Z axis system which horizontally turns an arm supporting the chamfering wheel by a servo motor, and the arm has the same center axis as that for turning horizontally in the horizontally turning mechanism, the arm having a degree of freedom around the central axis as a supporting point. As the arm has such degree of freedom, problems of an error in shape of a glass plate, an error in position of the glass plate and so on can be eliminated.
In the numerically controlled chamfering apparatus for a glass plate disclosed in Japanese Unexamined Patent Publication No. 37040/1984, however, there were problems that because a point for driving by the X and Y driving systems did not coincide with a point for grinding the glass plate, (1) it was unavoidable that a speed of grinding at a corner portion greatly decreased in comparison with that at a linear portion, and (2) a centrifugal force was produced at a swing arm and a wheel spindle at the corner portion, however, there was no back-up system. As a result, it was difficult to uniformly chamfer the peripheral edge of a glass plate.
Further, since the shape of glass plates to be supplied are slightly different from each other. The diameter of the chamfering wheel becomes small due to wearing. In a case of the replacement of a chamfering wheel, the function of grinding of a fresh chamfering wheel is different from that of the chamfering wheel which has been replaced. In such cases, the conventional numerically controlled chamfering apparatus for a glass plate could not cope enough with a change of the function of grinding of the chamfering wheel or another change, and there were a disadvantage that a quantity of chamfering varies for products.
SUMMARY OF THE INVENTION
In view of the above-mentioned circumstances, it is an object of the present invention to provide a numerically controlled chamfering apparatus for a glass plate capable of machining at a constant quantity of chamfering even when a change in the function of grinding of a chamfering wheel takes place.
The foregoing and other objects of the present invention have been attained by providing a numerically controlled chamfering apparatus for a glass plate wherein a numerical instruction indicating a shape resembling the shape of the peripheral edge of a glass plate is previously given, and a chamfering wheel is moved along the peripheral edge of the glass plate on the basis of the numerical instruction to grind the peripheral edge of the glass plate to thereby perform chamfering, said numerically controlled chamfering apparatus being characterized by comprising a base, a fitting holder provided on the base to hold the glass plate, an X-axis moving means for moving a chamfering wheel on the base in the direction of an X axis, a Y-axis moving means for mo
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Kanamaru Shigeyuki
Nakai Kouichirou
Asahi Glass Company Ltd.
Rose Robert A.
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