Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1982-06-30
1985-05-21
Lesmes, George F.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156227, 156257, 15181, 15199, 15DIG3, 51293, B31F 300
Patent
active
045184526
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for producing a grinding- or polishing disc in which the grinding members are flexible, and to a grinding- or polishing machine for this purpose.
Grinding- or polishing discs are used as rotating implements of different kinds. Usually the abrasive active medium is provided with abrasive grits, but non-abrasive mediums are also used for removing e.g. surface coatings such as rust or the like.
Hitherto known discs of this kind are produced by way of some kind of fastening of the abrasive medium to a carrier in the shape of a solid of revolution. It can be glued on or by mechanical means be fastened to the carrier.
Such discs are difficult to produce as they must have a uniform grinding surface and, if replacement of destroyed or worn members is desired, also be provided with means which admit a replacement of the components. Moreover the materials consumption is very large as the single components must be produced separately and thereafter be assembled.
It is the object of this invention to meet these defects and indicate an improved method for the production of such discs. This is achieved by making a number of parrallel cuts through a rectangular sheet from the opposite lateral edges into a point short of the longitudinal centre line, for the formation of a number of segments, whereafter the sheet is folded up around the centre and then bent and joined together with the central portion of one end against the central portion of the opposite end for the formation of a closed ring. By using this method it is achieved in a hitherto unknown and simple way to produce a ring with grinding- or polishing segments regularly disposed along the whole periphery of the ring, which segments all represent a portion of the closed ring formed from one single sheet. The formation of the grinding segments is done by a slit of the two sides of the sheet from the basic material, and the ring is formed by folding this sheet in the first place around the centre and then folding it for the formation of the closed ring. This ring member can now be assembled either alone or together with adjacent rings for the formation of an implement. By using this method there is thus achieved a saving of materials of at least 35 percent achieved in relation to a punching of a corresponding ring in one single sheet, at the same time as the number of segments is doubled, as the ring according to the invention gets two segments on top of each other. Thus the number of rings on an implement can be considerably reduced as the grinding capability is thereby considerably increased. At the same time a completely exact arrangement of the single grinding segments with the same length and characteristics is achieved in a simple way. This results in the wanted regular grinding capability which can usually only be achieved by an extensive after-treatment of the implement. Moreover the method secures that the grinding segments can rotate around their longitudinal axis, as the method secures that the single segments are placed at a suitable distance to the adjacent segments. This means that the implement becomes self-regulating, as the segments will adjust themselves to the prepared member. If the member is even the segments rotate about 90.degree. and grind completely evenly, while they in case of a profiled member will adjust themselves to this by rotating more or less. The grinding effect is thus adjusted to the shape and nature of the surface.
By inserting an adhesive bead along the folding line in the centre and then, if necessary, activating it, the joints can be easily secured. This bead can e.g. consist of a hot melt adhesive material, or, in case of a metal sheet, a fitted soldering material could be used.
The rings are assembled for use by mounting them in retaining discs with the folded edge pinched between adjacent discs, and mounting the discs on a rotatable spindle. This assembly grinds completely evenly, and besides is simple to take apart and assemble.
In order to be able to quickly tighten the assembly and ret
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Atkinson William M.
Lesmes George F.
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