RU1770086C - Equipment for rolling of band, made of powders - Google Patents

Abstract

The invention relates to powder metallurgy, in particular to devices for rolling a strip of powder. The rolling rolls are equipped with width limiters of the rolled strip made in the form of hollow rings of elastic material. When rotating, the rollers drive conveyor belts for feeding powder from the hopper into the gap between the rollers, and the hollow rings rotate together with the rollers, participating in the powder supply. In this case, due to the contact of the rings with each other, the height of the limiter increases, which favors the capture of powder on the periphery of the device. 1 PLN 3 ill.

Description

The invention relates to powder metallurgy, in particular to a device for rolling a strip of powders.

A rolling mill for producing a tape is known, including a double roll stand equipped with belt width limiters. However, on this mill it is possible to roll the tape only from metallic materials, and the limiter serves as a calibrating element.

Closest to the invention is a device that implements a method for rolling a powder belt, comprising a powder hopper, rolling rolls and tape width limiters of elastic material. But the design drawback of this device is the impossibility of rolling a high-quality ribbon in the mill, in particular, from expanded graphite (graphite in the form of flakes with a weight of 1 dm3 equal to 2-8 grams). This poor quality is explained by the uneven density over the cross section of the tape. Uneven density towards her

the reduction is especially noticeable at the edges, since the main supply of graphite flakes is carried out by capture by tape-forming rolls, and stagnant zones are formed on the periphery. The reason for the formation of stagnant zones is thus the unfavorable conditions for the capture of powder on the periphery compared with the Central part of the device. As a result, the powder enters at a different speed over the cross section (width of the tape), so it is impossible to obtain a uniform density, and therefore, uniform properties across the width of the tape. The aim of the invention is to improve the quality by ensuring uniform density of the powder across the width.

This goal is achieved in that in a device containing a powder hopper, rolling rolls and tape width limiters of elastic material, the limiters are made in the form of hollow rings and are mounted on each roll with the possibility of rotation together with the roller and uve (L

with

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the height of the limiter due to their contact with each other. In addition, to obtain a profile tape, the rings are made with local thickenings on the surfaces of contact with the powder.

In FIG. 1-3 shows a diagram of the device.

The device consists of the following main units: rolling rolls 1 and 2 with rings 3 and 4 located along the mx edges along the edges. When rolling, the rolls can move transport belts 5, 6, which together with the side walls 7, 8 form a hopper with expanded graphite 9 placed therein (weighing from 2 to 8 grams per 1 dm3) - Graphite, crimped by rolls 1, 2, is converted into tape 10.

The operation of the device is carried out in the following sequence.

Rolls 1 and 2 are set apart from each other with a gap equal to the thickness of the graphite tape obtained from them. Using any of the known methods, we load expanded graphite 9 into the hopper. Graphite 9, when the rolls 1 and 2 rotate, is carried down by the conveyor belts 5, 6, The side walls 7, 8 of the hopper in their base are in contact with rings 3.4 made in the form of chambers made of elastic material with an air cavity. Rings limit the length of the lenga in width. They rotate together with rolls 1, 2, with the same revolutions. In this case, the rings serve as lateral limiters in the lower part of the hopper. As a result, the expanded graphite is simultaneously fed into the zone between the rollers 1, 2 both through the conveyor belts 5, 6 and through the lateral surfaces of the rings 3, 4. In this case, due to the elasticity of the material of the ring and the presence of a gap in it between the rollers, a, therefore, the size of the tape thickness

easy to maintain since the longitudinal section of the cavity decreases as the rings rotate and can reach 0. In this case, the height of the limiter increases and increases. favorable conditions for the capture of the powder are provided. The required tape size in width can be obtained by varying the geometric dimensions of the rings and grooves of the rolls.

When using the described device provides an increase in quality due to the uniformity of the plane across the width of the tape as a result of favorable conditions for the capture of powder on the periphery

devices compared to a known device.

In order to obtain a profile along the width of the tape, elastic rings can also be made with local thickenings on the side

powder contact surfaces. The rolling mill is designed as a working draft and is under construction. The economic effect when using it will be 100 thousand rubles.

Claims (2)

1. A device for rolling a tape of powders containing a hopper for filling powder, rolls and width limiters of the tape made of elastic material, characterized in that, in order to improve quality by ensuring uniform powder density across the width of the tape, the stops are made in the form of hollow rings and are installed on each the roll can rotate together with the roll 1 and change the height of the limiter due to their contact with each other. 2. The device according to p. 1, with the exception that, in order to obtain a profile across the width of the tape, the rings are made with local thickenings on the surfaces of contact with the powder. 5 A B 6 Aa Fie. 1 th F And j -8 -thirteen i Fi $ .1 Ґ $ -Es with b