CS242714B1 - Stopper Stopper Head - Google Patents

Abstract

The solution relates to a starting head of a stopper rod for continuous casting of steel, which at the beginning of casting forms a closing bottom connecting the forming ingot with the stopper rod. The starting head of the stopper rod is provided with a two-hook protrusion with an intermediate groove in the range of one half to one tenth of the cross-section of the ingot.

Description

(54) Stopper rod starter head

The invention relates to a starter head of a stopper rod for the continuous casting of steel, which at the beginning of the casting forms a closing bottom connecting the forming bar to the stopper rod.

The starter head of the stopper rod is provided with a double hook projection with an intermediate groove ranging from one half to one tenth of the cross section of the blank.

FIG

2427.4

The invention relates to a starter head of a stopper rod for the continuous casting of steel.

The starter head of the stopper rod for a continuous swirl bottom, which connects the forming billet, passes through the drawing stand.

At the beginning of the casting of the steel, the casting of the steel forms a multi-part stopper rod and together with it

In the vertical type continuous casting block, the suction rod start heads are mainly used with disposable start pins which are lined with cooling scrap prior to casting to rapidly cool the first steel grout in the crystallizer.

This prior art, known and used, entails considerable costs for the manufacture of starter pins and the costly handling and transport of them to the plant, and the cost of β waste.

Further, it is known to use a hollow starter head with a closed cavity creating a central riser in the region of the highest heat capacity of the blank under the liquid core.

The advantage of this method is the removal of costly starting pins, the disadvantage is the increased susceptibility to liquid steel penetrations when tearing off the plastic part of the boss of the starter head from the stopper rod and thus reducing the operational reliability at the beginning of the casting and reducing the work safety.

For billet continuous castings, simple tilting hooks, centrally oriented, are used. Another type of retractable heads for larger cross-sections are heads with a continuous cylindrical protrusion R-shaped.

These gutters require solid guides in the secondary area and do not allow lateral deflections. Another known type for billet continuous casting is the centrally oriented anchor starter head with a protruding centering bulkhead in the form of a keel.

Said heads remove forged start pins, but their central orientation is again in the most stressed thermal region. Furthermore, the central keel-like bulkhead presents a risk of wear due to the erosion of the flowing steel, which implies a deterioration in the possibility of the plug rod being ejected by welding the billet head onto the plug rod.

Disadvantages of the prior art devices are completely eliminated by the stopper rod starting head according to the invention, which is characterized in that the stopper rod head is provided with a protrusion, the protrusion is a double hook with an intermediate groove, ranging from one half to one tenth of the cross section of the blank. A possible adjustment of the inclination of the double hook projection to the blank axis is between less than 90 ° and greater than 30 °.

The starter head of the stopper rod of the present invention provides a number of advantages, for example, the extremely favorable conditions for joining the double hook head to the billet as it pulls on a solid crust near the crystallizer wall and not in the central section where heat is accumulated under the liquid core.

The effective heat dissipation and cooling capacity of the double hook head of the stopper rod are so great that it is not necessary to apply a cooling swab to the crystallizer after sealing it. At the same time, the starter head of the invention avoids lateral deflection of the drawn strand during continuous casting along the path of the metallurgical axis, using solid bark off the center of the strand. This provides greater operational reliability and a quick start when the steel is continuously cast.

An exemplary embodiment of a stopper rod start head according to the invention is shown schematically in the accompanying drawing, in FIG. 1 in a side view and in FIG. 2 in a plan view.

The starter head X is rigidly connected to the end of the stopper rod 2 and is provided with a double hook projection X which extends into the unlabeled blank in the range of one-half to one tenth of the cross-section of the blank to create favorable heat dissipation conditions. There is an intermediate groove A in the two-headed projection of the head to prevent lateral deflection of the unlabeled blank during its drawing during casting.

The function of the double head is to connect the starter head and stopper rods 2 to the coldest part of the forming blank and to perfectly guide the blank in the vertical direction.

By said shape of the start head of the stopper rod, with the intermediate groove 6 and the double hook projection 2, it allows its easy ejection from the blank in the horizontal direction with simultaneous vertical movement.

Claims (1)

SUBJECT OF THE INVENTION Stopper head starting device for continuous cutting of metals, especially steel, connected to the upper part of the stopper rod and provided with a projection and groove, characterized in that the projection (3) is a double hook 8 intermediate groove (4) in the range of half to one tenth of the cross-section.