Electric heating – Metal heating – Of cylinders
Patent
1984-07-09
1986-02-04
Albritton, C. L.
Electric heating
Metal heating
Of cylinders
219 82, B23K 1108
Patent
active
045688125
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for the semiautomatic or fully automatic electric longitudinal-seam mash resistance welding of can bodies from overlapping, cut-to-size sheet-metal blanks rolled into sidewalls, with a guide means arranged in front of the welding site for determining the lap width of the sidewall edges including resilient guide elements, by means of which the sidewall edges, when traveling toward the welding site, can be pressed against the bases of the groove of a Z-rail, and with a calibrating rim arranged in the zone of the welding site, with such a construction of the guide means that the lap width of the sidewall edges at the welding site is at most six times the thickness of the can wall, and with wire electrodes that can be pulled off a reel and are guided over electrode rollers, these electrodes being fashioned as flat-wire electrodes having a width exceeding the lap width of the sidewall edges at the welding site.
In a conventional device of this type (German Pat. No. 2,559,671), the Z-rail is of such a configuration that the bases of the groove of the Z-rail converge in the direction toward the welding site along the lines of a continuously decreasing overlapping of the sidewall edges, and the axes of the electrode rollers are inclined with respect to the plane perpendicular to the welding direction in such a way that the sidewall edges are thereby pushed one on top of the other. One disadvantage in this known device resides in that the manufacture of a Z-rail of such configuration is difficult and expensive, and that a Z-rail of such a form can be correctly aligned at the device only with great effort. This drawback is especially disturbing in case Z-rails with groove bases converging under predetermined angles are associated with specific weld seam lengths, i.e. sidewall heights, and welding speeds, so that the Z-rail must be exchanged each time the manufacturing procedure undergoes conversion. It is furthermore disadvantageous in the known device that a high manufacturing accuracy and exact control are required for obtaining the correct inclined position of the axes of the electrode rollers.
It is an object of the invention to avoid the aforementioned disadvantages while simultaneously retaining an at least equally satisfactory operability of the device. In this connection, another objective resides in providing a Z-rail that can be produced and adjusted in a simple way, and in achieving a simpler manufacture and alignment of the bearings for the electrode rollers.
Accordingly, a feature of the invention resides, in a device of the type discussed hereinabove, wherein the groove bases of the Z-rail extend in parallel along the lines of an overlapping of the sidewall edges that remains the same, and in that the axes of the electrode rollers lie in the plane perpendicular to the welding direction.
It has been found surprisingly that a satisfactory operability of the device in connection with the welding of can bodies neither requires the configuration of the Z-rail heretofore considered necessary, nor needs the inclined positioning of the electrode rollers likewise heretofore considered a necessity. The invention furthermore has the advantage that the sidewalls even while being fed along the Z-rail, assume a shape more closely approaching a cylindrical configuration than in the conventional device where the sidewalls, in this zone, have a greater conicity. Furthermore, the invention has the advantage that the sidewalls are fed more smoothly inasmuch as there is no need for first creating an overlap that is too wide, and thereafter again reducing such overlap; in other words, the troublesome transition from increasing overlap to reduced overlap is avoided.
Finally, the form of the Z-rail provided by this invention facilitates regrinding of worn Z-rails for reuse in a welding step with greater overlap.
A further object of the invention is the provision of a device for the semi-automatic or fully automatic electric longitudinal-seam mash resistance welding of can bodies wherein an o
REFERENCES:
patent: 4160892 (1979-07-01), Opprecht et al.
Nockher Gerhard
Panknin Walter
Ruhl Rolf
Albritton C. L.
L. Schuler GmbH
Sigda C. M.
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