Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1987-12-04
1990-06-26
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51 35, 51 56R, 51 60, 5116575, 51DIG14, 51 33R, B24B 1908, B24D 718
Patent
active
049360523
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a grinding apparatus and method used to grind a processed surface such as a molded surface of a workpiece, for example, a molding die.
BACKGROUND ART
One type of this sort of grinding apparatus has heretofore been known in which an upper support frame which extends horizontally in the lateral direction of the apparatus is stretched between and supported by supports of a frame in such a manner that the upper support frame is movable in the longitudinal direction, and a moving member is supported on the upper support frame so as to be laterally movable, and further a wheel head is vertically movably supported on the moving member.
In this grinding apparatus, however, the upper support frame is moved on the supports together with the moving member and the wheel head in order to change the position of the wheel head in the longitudinal direction. Therefore, it is necessary to provide guide support frames or the like for the upper support frame on both lateral sides, respectively, of the frame, and this complicates the structure. Moreover, the left and right sides of the frame are closed by the guide support frames or the like. Accordingly, there is the problem that it is considerably troublesome to handle a workpiece when it is loaded into or unloaded from the frame. In addition, to grind a processed surface of a molding die or the like which has a complicated configuration, it is generally necessary to press a grindstone against the processed surface and move the grindstone in this state so as to follow changes in configuration of the processed surface.
There has been known another type of the above-described sort of grinding apparatus in which a mounting member is vertically movably supported with respect to a moving member which is supported on a frame in such a manner that the moving member is movable in two directions which intersect each other at right angles within a horizontal plane, and a wheel head is vertically movably attached to the mounting member.
However, in grinding of vertically extending processed surfaces by the use of this grinding apparatus, when, after one surface has been ground, another surface is to be ground, it is necessary to change the direction or angle in or at which the grindstone is mounted to the wheel head. Particularly, in the case where the vertically extending surfaces are curvedly contiguous with each other, the operator must frequently and repeatedly change the grindstone mounting direction or angle, which results disadvantageously in a considerable lowering in the operating efficiency.
Further, in this grinding apparatus, the change of the position of the wheel head in the vertical direction can be effected only in the vicinity of the wheel head. Accordingly, the amount of change in the position is limited and it is therefore impossible to cope with a large workpiece, disadvantageously.
A still another type of the above-described sort of grinding apparatus has heretofore been known in which a mounting member is vertically movably supported with respect to a moving member which is supported on a frame in such a manner that the moving member is movable in the longitudinal and lateral directions, and a wheel head is supported with respect to the mounting member in such a manner as to be rotatable around an axis which extends horizontally in the lateral direction and also around an axis which extends longitudinally while intersecting said axis at right angles.
However, in this grinding apparatus, the wheel head is rotatably supported on the vertically movable mounting member, and the center of rotation of the wheel head is moved in accordance with the vertical movement of the mounting member. Accordingly, the distance from the wheel head to the center of rotation thereof is constant at all times. As a result, the movable range of the wheel head is limited by the angle of rotation thereof to a narrow range, which means that the grindstone cannot reach the innermost portion of the workpiece, disadvantageously.
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Nagase Noboru
Yamaguchi Masao
Nagase Iron Works Co., Ltd.
Schmidt Frederick R.
Shideler Blynn
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