SU891208A1 - Stool for through ingot mould - Google Patents

Description

I

The invention relates to metallurgy, in particular to steelmaking, and can be applied when casting steel into continuous molds mounted on pallets.

A pan is known for casting into through molds, on the working surface of which two longitudinal protrusions are made, freely entering inside of the mold II.

Also known is a pan for a through mold with a recess on the working surface and ribs 21.

However, the durability of the ribs of this pallet is low, they withstand 7-10 fillings, the size of the bottom trim is 2.5-3%.

The purpose of the invention is to increase the durability of the pallet and reduce the size of the bottom cut of the ingot.

The goal is achieved by the fact that in a pallet having a recess on the working surface and pe6paj

the latter are located along the longitudinal axis of the pallet and are made in the cross section of a triangle with a vertex angle of 60-120, a height of 0.5-0.7 of the height of the recess, and a base of I / 31/7 of its width.

FIG. 1 shows a pallet, a cross-section; FIG. 2 the same, top view.

Plate 1 - the pallet has a recess 2 with ribs 3 n 4, made during the casting of the pallet. The direction of the edges of the edges coincides with the longitudinal axis of the pallet. The angle o1 at the tops of the ribs is 60-120 °. The direction of the ribs and the angles indicated at their tops favor subsequent operations to remove ingots from the pallets.

The height of the ribs is determined empirically when testing pallets with different heights of ribs.

3

When the rib height is less than 0.5 indentation size, the angle of 1e at its top is less bO and the size of the rib bottom is less than 1/7 of the width of the stiffener rib is weakly opposed to the eroding effect of the steel jet and after 10-15 fillings its protective effect.

When the height of the rib is more than 0.7, the magnitude of the recess and the angle at the top of the rib are more than 120, the size of the slab bottom part of the ingot exceeds the rate of the bottom edge of the ingot roll (more than 3%).

The size of the base of the rib should not exceed 1/3 of the width of the recess in the plate of the pallet to avoid the destruction of the ribs from direct contact with the falling stream of steel.

So, when rolling ingots weighing 16–20 tons, cast into wider downwardly shaped molds with pallets, when the ribs are 0.5-0.7 in height and when the base of the ribs is 1 / 3–1 / 7 in width of the recess, the ingot did not exceed the size of the pin by comparing aymg ing.

Example. In the slab of a unified pan for molds of the type CNT16-20, a standard recess is made with the following dimensions: depth 100 mm, maximum width and length along the working upper plane of the pallet 640 and 1200 mm, respectively. The width of the bottom plane of the recess is 500 mm. The optimal dimensions of the ribs are the following: height 70 mm (about 7 the depth of the cavity), width of the base 140 mm (1/36 of the width of the cavity), apex angle 90 °. The width of the flat base in the center of the recess of the pallet plate is 220 mm. The maximum length of the ribs is 1200 mm.

When casting from above, the steel stream is directed to the center of the pallet. When ud84

The re planed part of the bottom of the jet is broken apart. Partially, the splashes fall on the surface of the ribs, which, as shown by experiments, snags the surface of the ingot by 25–30%. The stiffeners themselves can withstand up to 20-25 fillings (the absolute resistance of the steel pallets 30-35) and strengthen the structure

pallet.

It is known that the crystallization and cooling of the ingot is accompanied by a decrease in the linear dimensions of its bottom part as well. In this way,

when welding an ingot to a pallet, stiffeners also contribute to the self-separation of the ingot from the central, most weakened part of the sub1 slab, it. Experiments have shown that the proposed

the pallet has better resistance to breaking and destruction than that used at the plant. Consumption experienced pallets C) {Izil per 1 kg / t of cast steel.

Claims (2)

Invention Formula A tray for a through mold, having a recess and ribs on the working surface, is necessary so that, in order to increase its durability and reduce the size of the bottom cut of the ingot, the ribs are located along the longitudinal axis of the pallet and are made in the transverse direction. a section in the form of a triangle with an apex angle of 60-1.20 ° with a height equal to 0.5-0.7 of the height of the depression, and a base equal to 1/3-1 / 7 of its width. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 303140, cl. B 22 D 7/12, 1969. 2. Copyright testimony of the USSR for application number 2604846 / 22-02, cl. B 22 D 7/06, 1978.