Metal founding – Starter bar – Disconnectable
Patent
1993-09-03
1994-08-09
Bradley, P. Austin
Metal founding
Starter bar
Disconnectable
164426, B22D 1108
Patent
active
053357140
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a dummy bar for continuous casting installations with a curved bar guide arranged downstream of a mold, in particular for producing steel billets in slab form.
Dummy bars for continuous casting installations having a curved guide are generally made from chain links connected by pins (DE-PS 12 90 606) or from flexible strips (U.S. Pat. No. 3,262,162). In U.S. Pat. No. 3,262,162, the necessary billet thickness, that is, the distance between the transporting rollers, is achieved by means of blocks fastened on the flexible strip. According to DE-PS 12 90 606, spring elements suitable for transmitting the conveying forces of the transporting rollers to the billet are arranged on the individual links of the starting chain in the event that the same dummy bar is to be used for different hot-billet thicknesses.
According to U.S. Pat. No. 3,610,321, it is already known that for purposes of transmitting the high conveying forces to the dummy bar the frictional engagement between the steel dummy bar and the steel transporting rollers has a negative influence on the life of the dummy bar and continuous-casting rollers. Therefore, in order to ensure frictional engagement with low bearing or contact pressure, it is suggested in U.S. Pat. No. 3,610,321 to install spring elements in the dummy bar and to cover the end face of the plates supported by the springs as well as the opposite surface at the dummy bar with a rubber-like material.
It is also known from DE-PS 11 35 621 to produce the dummy bar, in its entirety, from a flexible material which can possibly be fiber-reinforced. However, in the case of the two latter embodiment forms of dummy bars, it should be noted that the continuously flexible dummy bar is not suitable for the high conveying forces in slabbing installations, and in the embodiment form according to U.S. Pat. No. 3,610,321 the wear on the rollers when the rollers engage with the base body is not entirely satisfactory. Moreover, the embodiment form according to U.S. Pat. No. 3,610,321 is very costly and not suited for curved bar guides.
Therefore, the present invention has the object of providing a simply designed dummy bar which does not have the described disadvantages.
In a dummy bar of the generic type according to claim 1, this object is met according to the invention with the features of the characterizing part of claim 1. Advantageous further developments of the invention are indicated in the subclaims.
The dummy bar according to the invention is described in more detail with reference to an embodiment example.
FIG. 1 shows a top view of a dummy bar;
FIG. 2 shows a section B--B according to FIG. 1 in enlarged scale;
FIG. 3 shows a section A--A according to FIG. 1 in enlarged scale.
The dummy bar shown in FIG. 1 which is provided with a dummy bar head for connecting the dummy bar with the hot billet via connecting members 11 projecting into a mold, not shown, serves for extracting the hot billet from the mold. The dummy bar, including the hot billet situated thereon, is drawn through the bar guide by driven paired transporting rollers, the bar guide being likewise formed from pairs of rollers. As can be seen in particular from FIGS. 2 and 3, the dummy bar according to the invention is made from a flexible, metallic band or strip 1 determining the width of the dummy bar. Components 3 are arranged in the two edge regions of the metallic strip, these components 3 being inserted in recesses of the flexible strip in the present example and projecting out from the surface of the strip 1. Of course, these components 3 can also be fastened to a surface of the strip, e.g. by welding. The components 3 have threaded bores for fastening strip-shaped spacers 2 by means of screws 9, these spacers 2 extending transversely to the longitudinal direction of the strip. The spacers 2 extending transversely to the strip 1 have mutually adjacent contact areas 6 in the region of the connection members 3. The spacers 2 are constructed between the components 3 in such a way that one side of a spac
REFERENCES:
patent: 3451466 (1969-06-01), Orr
patent: 3521697 (1970-07-01), Niskovskikh et al.
patent: 3610321 (1971-10-01), Khimich et al.
patent: 5197533 (1993-03-01), Behrends
Arvedi Giovanni
Ludorff Harald
Paris Hans-Joachim
Parschat Lothar
Pleschiutschnigg Fritz-Peter
Bradley P. Austin
Knapp Jeffrey T.
Mannesmann Aktiengesellschaft
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