SU676628A1 - Method of locating blanks in a furnace - Google Patents

Description

(54) METHOD FOR PACKING PLANTS IN THE FURNACE

one

The invention relates to ferrous metallurgy and is intended for use in pipe production mainly on hot rolling machines.

There is a method of laying blanks, including the location of blanks (pipes) with a gap relative to the bottom and moving them in the heating process, and the gap is created using washers placed along the length of the workpiece.

The disadvantage of this method is its low productivity. This is due to the fact that in a known method each tubular billet requires several shields to be put on it, and after heating the blank, these washers must be removed. Such dependence creates considerable difficulties in servicing and entails a great expenditure of working time. The productivity is also adversely affected by the fact that the workpiece with washers during the heating period is located on the hearth, which does not allow more effect to effectively use the elevated temperature of the upper layers of the heating space of the furnace. Under such conditions, the possibility of contact of the scale with the titanium workpiece is also not excluded, which may lead to an explosion.

The aim of the invention is to increase productivity in the manufacture of pipes

from titanium or its alloys.

This is achieved by the fact that the coasters are made of stainless steel and spread on the hearth of the furnace in a continuous series. The drawing shows the placement of supports and blanks on the furnace bottom.

On under 1 stack stand 2, made of stainless steel or other neokalinoobrazuyuschego material. Stands set in a continuous layer,

and for fixing them on the hearth, stops 3 are provided. Thus, the hearth of the furnace with the scale present on it is covered with stainless steel supports, which is an insulator for titanium-alloy blanks. In addition, grooves are formed at the joints of the coasters, convenient for positioning the blanks in them.

After zstanovki coasters loading mechanism placed on their workpiece

4, for which the hearth of the annular kiln is periodically turned, mounted coaxially with the loading mechanism. In this way,

heating of the blanks is carried out over the furnace bottom. in the zone isolated from the scale and in the space with higher temperatures. After heating the blanks to the temperature required for rolling the titanium-containing tubes, the bottom with the blanks is installed at the discharge mechanism and with its help the blanks are removed.

An example of the method.

From the assortment of titanium-containing alloys of billets 140–270 mm in the pipe-rolling shop No. 2 of the Nikopol South Pipe Plant, the most frequently used billet with a diameter of 170 mm was selected. As supports, a blank of stainless steel X18H10T with a diameter of 140 mm was used. Titanium-containing alloys require a heating temperature of 1060-1240 ° С and prolonged heating from 1 h 50 min to 2 h 20 min. In accordance with the quality of the alloy of the billet with a diameter of 170 mm, the heating temperature was 1100 ° C and the heating time was 2 hours. A crane was placed on a rack with a diameter of 140 mm made of stainless steel X18H10T. Behind them laid blanks of titanium alloy with a diameter of 170 mm. Dispenser stands from the blanks for pipes one filed on the roller. Then, along a roller table and with the help of a loading mechanism, the stands were laid on a rotating hearth. Stands were limited to stops. After installing the stainless steel coasters, the loading mechanism laid the workpieces with a diameter of 170 mm on them. Soaked in the oven for two hours at a temperature of 1100 ° C, the workpieces were removed one by one by means of the unloading mechanism, laid on a rack. From the rack mechanism for rolling table billet filed on a rolling mill. Then, using heated coasters from stainless steel billets, they were removed by the same mechanism and applied for rolling.

The advantages of the proposed method lie in the fact that there is no need to stop the ring furnaces, cool them and clean the bottom of the scale and subsequent heating, i.e., the non-productive stops are eliminated. The presence of blanks at the upper level of the heating zone (under the bottom) shortens the time of heating them by 15 minutes while heating the supports. In general, there is no need to build an additional furnace for heating titanium-containing alloys.

Claims (1)

Invention Formula The method of laying the blanks in a furnace, including placing them with a gap relative to the furnace bottom by means of stands, characterized in that, in order to increase productivity in the production of tubes from titanium-containing alloys, stainless steel stands are laid in a flat layer before the laying of blanks. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 579530, C 21D 9/08, 1976.