SU1258612A1 - Apparatus for cleaning the surface of metallic powders - Google Patents

Abstract

The invention relates to powder metallurgy, in particular, to devices for cleaning the surface of metal powders from oxide films and slag inclusions by successive separation of the original and purified powder. The purpose of the invention is to improve the quality of powder products, productivity and ffffy degree of cleaning the surface of the powder particles. The material to be cleaned from the hopper 1 is poured into the lower part of the first axis of the loading hopper of the section and through the feed channel 10 fills the lower part of the accelerating pipe 6. When the high-speed solenoid valve 8 is turned on, the compressed gas from the pneumatic line 7 enters the accelerating pipe of this section. The portion of the material being cleaned under the action of the pressure drop at its upper and lower levels is accelerated in the accelerating tube. When the material is struck on the baffle plate 4 of this section, the surface of particles is abraded. Destroyed oxide films and slag inclusions in the form of fine dust are separated using an air-labyrinth separator from the particulate material and are removed from the device by the flow of exhaust gas. 1 il. , 1 tab. I- Plf / ttffffy (eff. F- ffffffffSaffaff oi

Description

The invention relates to powder metallurgy and can be used to clean the surface of metal powders from oxidized films and slag inclusions.

The purpose of the invention is to improve the quality of powder products, productivity and the degree of purification of the likelihood of metal powders.

The drawing shows the proposed my device.

The device consists of a loading hopper 1 connected by a loading nozzle 2 with a grinding chamber 3, a fender plate 4, partitions 5 of an air labyrinth separator, accelerating pipes 6, the upper ends of which are included in the grinding chamber and the lower ones are connected to the pneumatic line 7 by high-speed solenoid valves 8 The grinding chamber 3 is divided into sections by partitions 9 with slotted openings. The lower parts of the section are connected by supply channels 10 with the lower parts of the accelerating pipes 6. The last accelerating pipe 11 is connected to the discharge pipe 12.

The device works as follows.

The cleaning material from the hopper 1 is poured into the lower part of the first section of the loading hopper and under the influence of its own mass through the supply channel 10 fills the lower part of the accelerating pipe # 6, forming a portion of a certain volume. When you turn on the high-speed solenoid valve 8, the compressed gas from the pneumatic line 7 enters the accelerating tube of this section.

The portion of the material being cleaned under the action of a pressure differential at its upper and lower levels is accelerated in the acceleration tube. When the material strikes the baffle plate 4 of this section as a result of intense force interaction between the particles,

0

the high concentration of particles results in abrasion of the surface of the particles.

Destroyed oxide films and coke inclusions, in the form of fine dust, are separated using an air-labyrinth separator of separated material and are removed from the device by a stream of exhaust gas.

The material to be cleaned under the force of gravity returns to the lower part of the grinding chamber, where it forms the upper layer over the uncleaned material and is transferred to the next section. In the second and subsequent sections, a process similar to that described occurs. The material that has passed the required number of cleaning stages enters the last section, from which it is discharged through the last accelerating pipe 11. By adjusting the rate of selection of the powder being cleaned from the last section, the desired degree of cleaning of the material surface is achieved.

The use of the proposed device makes it possible to clean the surface of metal powders from oxide films and slag inclusions; to significantly improve the performance and degree of purification of materials, which significantly improves the strength characteristics of products, obtained by the No. 1X method of powder metallurgy.

At m fc p, In the known and proposed device, high-speed steel powder R6M5FZ was processed, which was then loaded into metal containers 0 95 mm, 500 mm long and, after heating to 1150 C, was pressed on a press with an axial force of 2000 tf to rods 0. 30 mm. Samples were prepared from the rods for bending tests and the cutting stock was cut out for carrying out stochastic tests. The results of the comparative tests are presented in the table.

five

five

0

five

The expected annual economic effect from the introduction of the proposed device into production is 259.2 thousand rubles.

Claims (1)

Invention Formula A device for cleaning the surface of metal noponbcoBi containing a loading hopper with a loading nozzle} a grinding chamber, a baffle plate, an air-laby sepa.Ad. Sabo editor Order 5068/14 TehredL.Serdyukov Proofreader -Tyrgas 757 Subscription of the USSR State Committee of Higher Education for inventions and discoveries P3035, Moscow, Zhg35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 124 rator, booster tubes, which are made by the fact that, in order to improve the quality of powder products, the productivity and degree of cleaning of the surface of metal powders, the grinding chamber is divided into sections by partitions with slotted openings along the line of repose of the material in the direction from the loading nozzle to the Last expansion pipe, which is connected to the discharge nozzle. TehredL.Serdyukov Proofreader M.Sharoshi