Abrading – Abrading process – With tool treating or forming
Reexamination Certificate
2001-10-16
2003-05-13
Hail, III, Joseph J. (Department: 3723)
Abrading
Abrading process
With tool treating or forming
C125S011040
Reexamination Certificate
active
06561879
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority to European Application No. 00122993.9, filed Oct. 23, 2000, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to a conditioning device for grinding wheels for machining the edge areas of plate-shaped objects, such as, for example, glass panes or the like, for which the grinding wheels, in a conditioned state, have at least one circumferential groove each which, at least in a partial section, tapers off towards the grinding wheel center.
2. Background Art
Bar-shaped conditioning devices are known in general practice and principally consist of a mineral material or materials having mineral components, the abrasive effect of which sets back the bond of the grinding wheel to be conditioned. The usual components of the material are, among others, aluminium oxide (corundum) and silicon carbide. The cross section is rectangular and the material properties are homogenous in the entire conditioning device.
The conditioned grinding wheel has a circumferential groove tapering off towards the grinding wheel center and of which the cross section has, in particular, a more or less semicircular form.
During the grinding operation of the edge areas of plate-shaped objects, such as, for example, the rounding of the edges of glass panes used in automobiles, the edge to be machined is at least brought to a convex curved form while, at the same time, the grinding wheel itself is subjected to a “machining” process due to wear caused by the machining of the edge areas of the glass panes so that the groove contour gradually resembles the contour of the unmachined edge areas of the glass panes and therefore needs to be conditioned.
By conditioning is basically understood to mean influencing of the sharpness of the grinding wheel surface including the groove surface, to maintain the groove contour for the longest possible time. In addition, by conditioning is also understood to indicate generation or restoring of a groove form, which has been used up or worn down or which has almost disappeared completely by numerous grinding operations.
As a result of the grinding operation of the edge areas, the corresponding grinding wheel surface cannot only become dull, but it can also be “over-sharpened”, which is equally undesired. Both deviations from the normal, sharpened desired state can be eliminated by conditioning.
Conditioning by means of the aforementioned bar-shaped conditioning devices is achieved in that the conditioning device is provided with a profile adapted to the cross section of the groove to be achieved and brought into contact with the rotating grinding wheel with the result that the distribution of the sharpening effect over the entire groove form is uniform so that partial areas are either sharpened insufficiently or other partial areas are over-sharpened
As the contour of the conditioning device rapidly adapts to the contour of the groove so that the conditioning device has no more influence on the groove, it is general practice that the conditioning, especially the profiling, is usually carried out by cavity sinking with an electrode being profiled according to the groove form.
The disadvantage of this is that this method requires a complex and expensive eroding equipment so that the worn grinding wheels are usually sent away to the manufacturer or to another specialist for reconditioning. This in turn is a time consuming and expensive solution because it requires at least one spare grinding wheel to be available until the return of the conditioned grinding wheel. If several grinding machines and/or several differently profiled grinding wheels are concerned, this can involve quite an expensive stock-keeping.
SUMMARY OF THE INVENTION
The task of the invention is to avoid the aforementioned disadvantages and to provide a conditioning device for grinding wheels for machining the edge areas of plate-shaped objects, such as, for example, glass panes or the like, for which the grinding wheels, in a conditioned state, have at least one circumferential groove each which, at least in a partial section, tapers off towards the grinding wheel center, to permit the easy conditioning of these grinding wheels at any time and any place without expensive equipment. In such a way, a homogenous sharpness over the groove contour is achieved and both the profiling and the profile-maintaining sharpness influence are achieved in one operating cycle without disassembly of the grinding wheel.
This task is achieved by a conditioning device for grinding wheels for machining the edge areas of plate-shaped objects, such as, for example, glass panes or the like, for which the grinding wheels, in a conditioned state, have at least one circumferential groove each which, at least in a partial section, tapers off towards the grinding wheel center, and for the conditioning of which the conditioning device has a cross section which is adapted to the cross section of the groove to be achieved and in that the width of the conditioning device basically corresponds to the width of the groove(s) and in that the length orientation from one lateral end to the other lateral end of the conditioning device can be configured in accordance with the depth orientation from one side edge to the other side edge of the groove(s) with growing length at an increasing depth to be achieved. This means that the rotating grinding wheel can be conditioned by contact with the bar-shaped conditioning device, while the grinding wheel can remain in the clamping fixture of the grinding equipment. In addition, the width of the conditioning device can be smaller than the groove, through which, however, only partial sections of the groove will be conditioned. On the other hand, the width of the conditioning device can also be larger than the width of the groove, through which the projecting sections will be removed unused.
Sharpening and, if required, profiling of the grinding wheel is effected automatically, at longest possible profile-maintenance, by the specially configured cross section of the conditioning device as the material removal depends on the length engaged in the grinding operation and the length orientation of the conditioning device corresponds to the depth orientation of the groove. Consequently, with the extreme, tapered side edges of the conditioning device, thus having a length of approximately zero, practically no material is removed while with the central areas of the conditioning device, having a longer length, a stronger removal is achieved resulting in the corresponding groove depth at this point.
Also, the width of the conditioning device can basically correspond to the width of the groove(s) and the volume orientation over the width of the conditioning device can be configured in accordance with the depth orientation from one side edge to the other side edge of the groove(s) with growing volume at increasing depth to be achieved, so that by variation of the number and size of incorporated pores or, especially of the clearances configured as lateral grooves or the like, a more or less strong conditioning is achieved.
In addition, the width of the conditioning device can basically correspond to the width of the groove(s) and the abrasive properties of the material of the conditioning device over the width of the conditioning device can be configured in accordance with the depth orientation from one side edge to the other side edge of the groove(s) with better abrasive properties at increasing depth to be achieved.
Furthermore, according to the invention, also the width of the conditioning device can basically correspond to the width of the groove(s) and the adjustment of the grain size distribution in relation to the chip clearances of the grinding wheel over the width of the conditioning device can be configured in accordance with the depth orientation from one side edge to the other side edge of the groove(s) with a better adaptation at increasing depth to be achieved, so that a stronger remo
Kohn & Associates PLLC
Thomas David B.
Wendt GmbH
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