JPS5836044B2 - Metal powder hot rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a rolled plate by hot rolling metal powder, and more particularly to an apparatus for manufacturing a rolled plate having a sealing device for isolating the sample from the outside air during the manufacturing process. Regarding.

In the production of dense rolled plates by hot rolling of metal powder or reduced metal powder, it is necessary to prevent oxidation by isolating the sample from the outside air.

Therefore, in the past, in many cases, the rolling section was enclosed in a container, which resulted in a drawback that the entire device became larger.

This drawback becomes even more noticeable as the rolling section becomes larger.
This method is disadvantageous in that it is costly and involves many operational and practical problems in maintaining a sealed state.

The present invention aims to eliminate these drawbacks of conventional equipment, and the present invention has a closed-type hopper at the upper part of a rolling section consisting of ordinary horizontal two-stage rolls and an upper part connected to the closed-type hopper. The device is characterized by having a seal box and a seal box at the bottom, and gas-sealing the parts of the device using a neutral gas flow.

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to Figure 1, reference numeral 1 denotes a sample heating section (or reduction reaction section), which heats metal powder (for example, active reduced iron powder that is easily reoxidized by reducing fine iron ore with hydrogen) to a high temperature state. .

The high temperature (e.g. 700℃) metal powder is transported to the hopper 2.
is supplied falling.

Reference numeral 3 denotes a two-tier Eihei type rolling roll, and the rolling roll 3 is located between an upper seal box 9 and a lower seal box 4, and the upper seal box 9 communicates with the lower end of the hopper 2. The lower end of the lower seal box 4 is the removal part 1 for the rolled plate.
Connects to 0.

Both seal boxes 4. , 9 and the roll 3 are assembled in a related structure as shown in FIG.

That is, an outer wall 11 is formed in the lower part of the upper seal box 9, and a space 12 that is open at the bottom is formed between the outer wall 11 and the outer peripheral surface of the upper seal box 9.

The opening 13 of the space 12 is located inside the upper end opening of the lower seal box 4 with a small gap, and its tip extends slightly below the upper end opening of the lower seal box 4. .

A neutral gas such as N2 gas is then pressurized into the space 12.

14 is its supply port.

A spiral tube 5 is disposed inside the lower seal box 4 for supplying a neutral gas such as N2 gas into the lower seal box 4.

Reference numeral 6 indicates a large number of nozzle holes attached to the spiral tube 5, and the outer end of the spiral tube 5 communicates with an N2 gas tank (not shown).

Furthermore, a cold water pipe 15 for cooling the inside of the take-out part 10 is provided on the outer periphery of the take-out part 10.

For operation, immediately after reduction or at high temperature, the metal powder No. 11 is rolled from the heating section 1 through the hopper 2 with the rolls 3 in a state where it is isolated from the outside air.

At this time, N2 gas is discharged downward from the spaces 12 formed at both ends of the horizontal two-stage roll 3 as shown by the arrow 7.

On the other hand, the N2 gas in the spiral tube 5 is ejected from the nozzle hole 6 into the lower seal box 4, and flows out from the bottom of the roll 3 toward the top on the outside of the gas flow indicated by the arrow 7, as shown by the arrow 8. do.

Gas curtains formed by such a neutral gas flow that alternately face each other cover the rolling section of the rolls 3, and rolling is carried out in a state where the rolling section is isolated from the outside air.

Then, the sheet coming out from the bottom of the roll is rapidly cooled at the take-out section without being exposed to outside air.

It goes without saying that a portion of the N2 gas from the nozzle hole 6 also flows into the button take-out portion 10, so that it is filled with the button.

In this way, in the present invention, gas curtains are created that alternately face each other up and down on the outside of the passage* of the materials above and below the rolls, so that the high-temperature powder and sheet-like materials are shielded from the outside air. can do.

The sheet that comes out from the bottom of the roll is continuously cooled to, for example, 100 degrees Celsius or less, and is held in a take-out section filled with neutral gas, so that oxidation hardly progresses even when exposed to outside air. It is possible to take out sheets continuously.

According to Namuko's apparatus, the powder material can be continuously transported from the heating furnace and the reduction furnace in a state where it is isolated from the outside air, and it is possible to continuously manufacture rolled sheets.

Next, examples will be shown.

The experiments were carried out using the apparatus shown in Figures 1 and 2 under the operating conditions shown in Table 1.

As a powder sample, powdered iron ore was subjected to hydrogen reduction (700°C, 30°C).
A rolled sheet was produced by dropping active reduced iron powder (60 to 100 mesh) which is easily reoxidized (60 to 100 mesh) into a hopper from above at a temperature of 700°C.

The properties of the obtained rolled sheet are as shown in Table 2, and the oxygen content in the iron (excluding oxygen in the gangue) is almost the same as that in the iron cooled in nitrogen immediately after reduction.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the rolled plate manufacturing apparatus according to the present invention, and FIG.
The figure is a front sectional view of the roll section. DESCRIPTION OF SYMBOLS 1... Heating part, 2... Hopper, 3... Rolling roll, 4... Lower seal box, 5... Spiral tube, 6
...Nozzle hole, 7...Downward gas outflow direction, 8...Upward gas outflow direction, 9...Upper seal box, 10
... Removal part, 11 ... Upper bottom outer wall, 12 ...
・Space, 13...Opening, 14...Gas supply port, 15
...Cold water pipe.

Claims (1)

[Claims] 1 Immediately after reduction or at high temperature ′=! In the hot rolling equipment, the metal powder is guided from the heating section to the hopper in a state where it is isolated from the outside air, and then rolled by the rolls. An upper seal box and a lower seal box are provided so that the neutral gas is released from the bottom of the roll, and the neutral gas is released upward from the bottom of the roll on the outside. A hot rolling equipment for metal powder in which the rolling part of the rolls is isolated from the outside air by a gas curtain.