Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1997-10-20
2000-05-16
Bryant, David P.
Metal working
Method of mechanical manufacture
Assembling or joining
220912, B21D 3900
Patent
active
060618922
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is generally related to joining two or more metal parts together. One special application of the invention is to join magnetic metal parts to non-magnetic metal parts, particularly when manufacturing cooking vessels provided with induction-heated bottoms, such as flying pans or kettles.
BACKGROUND OF THE INVENTION
Known methods for joining metal parts include the use of fasteners, such as bolts, screws or rivets, and welding and soldering. The latter methods melt the parts to form one integral body. in addition, it is known to countersink a harder metal part into a softer metal part by using linear compression exerted on the parts, whereby the joining of the parts is based on a malleable reshaping of the softer part.
The said use of mechanical fasteners as well as welding and soldering are inconvenient and time-consuming working methods. Furthermore, the finished product of these methods, as well as that of countersinking by compression, leaves a lot to be desired.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide a new method for joining metal parts in which the said disadvantages of prior art are avoided. The invention is characterised in that the parts are joined by using roll forming techniques and by placing at least two metal parts on top of each other on the form face of a tool that is made to rotate, the parts on the form face being made to rotate correspondingly, and by arranging the topmost part in linear rolling contact with a forming tool which is also rotated, whereby the malleable reshaping of the metal in the slot between the tools integrates the parts.
Roll forming is a cold-moulding method in which a rolling forming tool machines the metal that is reshaped in a manner which can be compared to dough kneading. In this case, the integration of the parts is based on the thinning of the metal material and on its spreading under the forming tool, and on the smaller-size part sinking into the larger part. Roll forming is particularly well-suited for joining one or more smaller, hard metal parts to a larger part of softer metal.
Joining metal parts by roll forming is a simple and fast procedure which neither requires heating nor creates waste. It also yields a very smooth and finished appearance. One special advantage of the method is that it can be combined with the shaping of the generated, integrated metal piece in the same roll forming stage.
According to a preferred embodiment of the invention, a netlike or perforated metal part is joined to a sheet-like metal part placed on top of it by making the metal ingredient of the latter part to penetrate the openings in the former part during roll forming. Instead of an integral mesh, perforated plate or the like, small metal particles or other similar separate metal parts arranged on the form face under the said sheet-like metal part can be attached to it. In each case, the metal material of the sheet-like part fills the openings of the part that is underneath in the roll forming, or the gaps between individual particles so that, as a result, the underlying part(s) sinks (sink) in and form(s) an integral part of the thus created, joined metal body.
As already mentioned, the invention can be used to join magnetic metal parts to non-magnetic metal parts. Consequently, a magnetic steel mesh or a perforated steel plate or magnetic steel particles can be joined to an aluminium sheet-like body by roll forming. In the forming, harder steel parts sink into the softer aluminium that is reshaped in a malleable manner. The method can be applied in the manufacture of cooking vessels provided with induction-heated bottoms, such as flying pans, saucepans or kettles, in which manufacture welding or linear compression between two planar bodies have been used so far in joining a magnetic steel part to the aluminium bottom of the vessel.
It is particularly preferable to carry out the joining of the magnetic part as part of the manufacture of the cooking vessel, such as a flying pan or a kettle, bas
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Bryant David P.
Rondex Oy Ltd.
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