RU1770043C - Equipment for steel bottom-pour - Google Patents

Abstract

The inventive device for casting steel contains a center, a distributor of liquid steel and siphon wiring, in the channels of which there are outlet openings, in the latter, a narrowing of 0.6-0.7 diameter and a length of 0.2-0.4 diameter is made on the channel side siphon wiring channel. 1 tab .. 2 ill.

Description

The device relates to ferrous metallurgy, in particular to steel siphon casting.

The purpose of the invention is to facilitate the separation of the ingot from the gating system and to improve the quality of its bottom.

This goal is achieved by the fact that in the outlet opening of the siphon wiring from the channel side, a narrowing with a diameter of 0.6-0.7 and a length of 0.2-0.4 of the diameter of the channel of the siphon wiring is made. A stepped outlet configuration allows a smaller diameter to form on the crystallized gate. The transition point of the larger diameter to the smaller one is a stress concentrator and in this place the ingot breaks from the gate system when it is removed from the pallet. It has been experimentally established that a decrease in the diameter of the narrowing of the outlet to a diameter smaller than 0.6 of the diameter of the siphon wiring channel is accompanied by a sharp increase in the resistance along the path of steel movement and a decrease in the casting speed. The increase in the diameter of the narrowed

parts of the outlet over 0.7 of the diameter of the siphon conduit channel turned out to be ineffective, since the complexity of separating the ingot from the gate system sharply increased due to the larger diameter of the neck. When the length of the narrowed section of the outlet is less than 0.2 of the diameter of the siphon conduit, the mechanical strength of the refractory is not always ensured, and an increase in the length of the narrowed section of the outlet above 0.4 of the diameter of the channel significantly increases the friction head loss and is accompanied by a drop in the casting speed.

Figure 1 shows the proposed device, a General view; figure 2 - the outlet of the proposed configuration.

The device comprises a center 1 with a liquid steel distributor 2 installed under it, having openings 3 and siphon wiring, equipped with channels 4 with output openings 5 of a step configuration, laid in a pallet b on which the mold 7 is mounted.

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ABOUT

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The device operates as follows.

Steel from the ladle is poured into the center 1 and through the holes 3 of the distributor 2 through the channels of siphon wires it enters the outlet holes 5 and then to the 7 installed on the pallet 6. Data on the average duration of ingots to be inserted into heating wells and the average proportion of ingots with unseparated gates at the boundary values of the parameters above and below are given in the table. From the data given in the table it can be seen that the use of the proposed device can reduce the average duration of planting in the smelting wells (30 ingots) by 7-8 minutes (22-25%) and reduce the proportion of ingots with

49–55% (abs) separated by sprues.

Claims (1)

SUMMARY OF THE INVENTION A steel siphon casting apparatus comprising through molds and a center mounted on a pallet, having a distributor located under the center, siphon wiring with channels and outlet openings, which, in order to facilitate the separation of the ingot from the siphon wiring and improving the quality of the bottom of the ingot, each outlet is made in a longitudinal section of a stepped configuration, moreover, the lower stage has a smaller diameter equal to 0.6-0.7 of the diameter of the channel of the siphon wiring, and the height of the lower stage is 0.2-0.4 magnitude of the latter. t ////// t FIG. 2 VL- „a fd