Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1980-03-12
1984-03-20
Goldberg, Howard N.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
228183, 414745, 29726, 291573C, B23P 1526
Patent
active
044372167
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method in manufacturing heat exchangers for cooling and heating purposes, said heat exchangers comprising a predetermined number of tubes with substantially rectangular cross section alternating with intermediate surface-enlarging members in the form of pleated, thin metal strips, united at their peaks by means of solder to the wider sides of the tubes and maintaining a uniform pitch between the tubes, starting from tube element pieces and surface-enlarging members of predetermined lengths.
The invention also relates to an apparatus for carrying out the method of manufacturing heat exchangers for cooling and heating purposes in accordance with the invention.
In the manufacture of heat exchangers for car radiators, for example, it is known in the art to manually alternately arrange tubes with a flat configuration and surface enlarging members in the form of pleated, thin metal strips in frames or the like, where either the tubes or the surface-enlarging members have been provided with solder. Subsequent to all the details required in such a heat exchanger being inserted in the frame, the stack of details situated therein is compressed with the aid of a bridging member or the like so that suitable abutment is obtained between the details incorporated.
After these steps have been taken, the stack of details enclosed in this way is subjected to heating so that the solder melts, whereafter the stack is cooled so that the peaks of the thin metal strips are soldered to the tubes and an intimate heat-conducting metallic union is established.
With the intention of obtaining optimum utilization of the material in manufacturing heat exchangers of the kind in question here, with respect to heat conducting ability and with regard to the desire of reducing the weight of the heat exchanger to the lowest value, it has been previously proposed, inter alia, to use copper strips for the production of the surface enlarging members, said strips having been rolled down to very small thicknesses.
However, in the manual handling of such surface-enlarging members built up from ever thinner copper strip, it has been found that these thin means are extremely easily deformed, which in turn has the consequence that there occur incomplete solder joints between the surface-enlarging members and the tube elements.
To remove this drawback, the surface-enlarging members have been produced in the form of pleated copper strips, soldered together with an intermediate flat metal strip to give the means greater stiffness and less fragility in handling.
These steps have not been found sufficient to master the said problem either, at least with regard to the manual handling.
On the basis of this experience it has been sought to eliminate manual handling and automate production of the heat exchangers in question, to avoid the risks of damage caused manually. The object of the invention is consequently to provide a method as above, which is substantially characterized in that the tube element pieces and surface-enlarging members are continuously placed in abutment with each other, and in this position are forcibly fed in their transverse direction while overcoming a predetermined restraining force, first through a heating zone for melting the solder to soldering temperature and thereafter through a cooling zone for cooling the melted solder to fusion temperature so that the peaks on the pleated metal strip are brought into intimate soldered union with adjacent tube member pieces.
The apparatus in accordance with the invention for carrying out the method of manufacturing heat exchangers for cooling and heating purposes is mainly characterized in that the apparatus has an advancing track provided with a charging and a discharging end for continuous forced advance in its transverse direction of the tube element pieces and surface-enlarging members alternately abutting in intimate mutual contact, a force feeder being coordinated with the feed track for carrying out said forced advance of the tube element pieces and su
REFERENCES:
patent: 3310868 (1967-03-01), La Porte et al.
patent: 4291450 (1981-09-01), Rhodes
patent: 4380106 (1983-04-01), Jonason
patent: 4380854 (1983-04-01), Jonason
Goldberg Howard N.
Granges Metallverken Aktiebolag
Rising V. K.
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