SU1253736A1 - Installation for pressure sintering - Google Patents

Description

The invention relates to powder metallurgy, in particular, installations for sintering blanks, for example friction materials, under pressure in a protective atmosphere.

The aim of the invention is to reduce the number of operations when loading and unloading blanks, improving reliability and reducing heat losses.

FIG. 1 shows the installation in the working position, a longitudinal section; FIG. 2 is a section A-A in FIG. (interceptor device); FIG. 3 is a section B-B on phi 1 (airlock compartment, cross section); FIG. 4 is a section of B-B of FIG. 1 (block fixation package blanks).

A pressure sintering unit contains a loading chamber comprising an airlock compartment with a carriage 1, which is integral with a lid 2, connected to a hydraulic cylinder rod, a pusher 3, a gate valve 4 and a working chamber 5, at the bottom of which a pressure cylinder 6 is installed. a furnace with a muffle 7 is located, in the lower part of which a package fixing unit is assembled, consisting of two pairs of sliding swivel sliders 8, each of which is connected to a drive. A heat exchanger 9 is mounted coaxially behind the muffle 7, which is a metal cup with a lined gas jacket forming an annular cavity. In the upper part, the heat exchanger is provided with an inlet nozzle, and in the lower part of the inner wall, there are directional openings for the heated protective gas to enter the internal cavity of the furnace tube. Above the heat exchanger is a water cooler 10, over which the bag trapping mechanism is installed. rolls 11 arranged against each other in sleeves rotatably and connected to the hydraulic cylinder. Above the refrigerator, an unloading chamber is mounted including an airlock compartment, similar to a pseudo compartment of a loading chamber with a carriage 12 and a lid 13, a gate 14 and a working chamber 15, in the upper part of which there is a stop 16 which is attached to the power frame of the installation. The camera is equipped with a pusher 17. Packs 18 are loaded into the installation.

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The installation works in a skinny manner.

Package 18 set on rollers 19 trolleys 1. Cart with package

is inserted into the airlock compartment, while the seal is ensured by pressing the cover 2 to the compartment case by the rod 20 of the trolley drive hydraulic cylinder. Then the bore compartment is flushed with an inert gas, the flap of the gate 4 is opened, and the pusher 3 moves the bag along the loading chamber bedside table and sets it over the pressure cylinder 6, then returns to its original position. The damper of the gate 4 is closed. Then the rod of the hydraulic cylinder 6 moves upward, pressing the stack of packages against the stop 16; A pressure sintering cycle is carried out. The installation continuously maintains an overpressure of protective gas which is supplied through the inlet of the heat exchanger 9 to the gas jacket of the latter, the passage through which the gas heats up and enters the internal cavity of the installation through directional holes in the internal wall of the heat exchanger. After the installation cycle ends, the packet capture mechanism and the packet fixing node are activated. In this case, the rollers 11 (fig. 3) are advanced and the sliders 8 are shifted to occupy the working position. After that, the rod of the hydraulic cylinder 6 is moved down, lowering the column of packages; in this case, the upper bag is picked up under the base by the rollers 11 of the locking mechanism and is separated from the bag column, which then moves down and is placed on the slides B of the bag fixing unit. Then the flap of the gate 14 opens, and the pusher 17 moves the bag from the rolls t1 of the locking mechanism

5 to the rollers 21 of the carriage 12, which form with the rollers 11 a common roller conveyor, and returns to its original position. The rollers 1 1 and the slide blocks 8 also return to their original position, and the gate of the gate 14 is closed. The airlock chamber of the discharge chamber is purged with an inert gas, after which the cover 13 opens and the trolley 12c is discharged from the discharge chamber of the discharge chamber.

The cycle is repeated by loading the next packet.

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312537364

The proposed installation provides a double stroke of the main hydraulic rod reducing the number of operations of the pressure cylinder. Reliability

loading and unloading the workpieces from a 30-piece boom increases as a result of lowering (in the known installation) to 24. Prizhi in 1, 5 times the drop of the terapatip

this eliminates the need to further cut the package when it is cooled, and

The pressure hydraulic cylinder and the heat loss is reduced by a factor of 2.

t

Phi.1

Fig.Z

Working slide

Editor T. Parfenova

Compiled by A.Tumanov Tehred L. Serdyukova

Order 4665/15 Circulation 757 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Uz.lf

Corrector C, Cherni

Claims (1)

PRESSURE SINKING PLANT, including a vertical muffle, a refrigerator, a pressure hydraulic cylinder, loading and unloading chambers with covers! and trolleys, a unit for fixing packages of blanks and a mechanism for capturing packages, characterized in that, in order to reduce the number of operations when loading and unloading blanks, to increase reliability and reduce heat loss, it is equipped with a heat exchanger communicating with the cavity of the muffle, the capture mechanism is made in the form of two groups installed with the possibility of rotation of the sliding rolls, the covers of the loading and unloading chambers are made integral with the trolleys, the trolleys are made with rollers with the possibility of forming a mechanism with sliding rollers ahvata common roller conveyor, a package fixing unit is made as two pairs of horizontally arranged sliding swivel slide, and the heat exchanger is arranged between the muffle and a refrigerator. SB (L s ND SL 00 m 00