SU1366289A1 - Arrangement for compacting tubular articles from powder - Google Patents

Abstract

This invention relates to devices for pressing tubular articles from. powder. The purpose of the invention is to expand the technological capabilities of the device by obtaining long, thin-walled products and improving the quality of the products. The screw 2 receives rotation from the drive through the wheel 5 and transports the powder from the hopper 18 into the cavity formed by the shell and mandrel 7. The shell then receives movement from the motor through a gear screw 19 - nut 20. First, the powder is compacted with a screw and then a mandrel mounted on the 2 part of the rod 4 protruding from the screw. After filling the casing over the entire length, the drives for rotating the screw and moving the casing are turned off, and the products are removed from the casing. 1 hp f-ly. 3 il. cl

Description

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The invention relates to powder metallurgy, in particular to devices for pressing tubular articles from powders.

The aim of the invention is to expand the technological capabilities of the device by obtaining long thin-walled products and improving the quality of the products.

FIG. 1 schematically presents the proposed device, a longitudinal section; FIG. 2 is a section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The device consists of a housing 1, inside which is installed a screw 2, connected by means of a gear wheel 3 with a drive (not shown).

shell and a removable mandrel 7. In this case, the shell receives the movement from the electric motor D by

the gear screw 19 is a nut 20. The powder entering the gap between the casing and the mandrel is compacted by the screw, and the final compaction is carried out by a detachable mandrel. At the same time, the screw drive is tuned to the maximum torque ensuring the manufacture of products with a given density. When exceeding the specified moment at a constant

By moving the sheath, the rotational speed of the auger is reduced, which leads to a decrease in the amount of powder fed to the core. The latter circumstance leads to

In the front part of the auger, the stern 4 is mounted with an increase in the frequency of rotation of the auger 4, fixed from the axial transfer to the leveling of the product density.

The plates are placed by means of balls 5, which allow the screw to rotate without rotating the rod. To place the balls in the annular groove,

formed by the screw and rod, serves as a hole, the exit from which is closed by a plug 6. A removable mandrel 7 mounted on a rod is fixed with a nut 8. The external diameter of the removable mandrel is equal to the internal diameter of the auger turns. A shell is mounted on the auger, consisting of a base 9 and movable parts 10 and 11. The latter are mounted on axis 12 and can be rotated relative to the base. The rotary parts are connected to each other by screws 13 and, together with the base, form a cavity, from which the cover 14 is closed. In addition, the rotatable parts are coupled with the guides 15 fixed in the housing. The shell has the ability to move along the heading relative to the auger and the housing, and with its end surface it mates with a sleeve 16, fixed from movement by screws 17, on which the hopper is mounted, 18. The casing is moved from the motor G by transferring the screw 19 - the nut 20, while the latter is fixed in the casing.

The device works as follows.

The screw 2 receives rotation from the drive by means of the gear wheel 3 and transports the powder from the feed hopper 18 to the cavity formed

After filling the casing over the entire length, the screw rotation and displacement actuators of the shells are turned off, the moving parts 10 and 11 are rotated on the axes 12, and the product is removed from the base 9.

After installing the component parts of the device in the initial position of the cycle

pressing is repeated.

The proposed device allows the manufacture of lengthy products in

Unlike the known device, which provides for the production of the type of sleeves. The rod in the proposed device acts only as a tensile force, and therefore the tensile strength of the material of the rod is much higher than

under the conditions of the joint action of tensile stress and torsion, which takes place in a known device. In addition, since the mandrel bar is subject to

simple loading, there is no need to make a mandrel, the length equal to the length of the product. In the known device for obtaining long products, respectively, an increase in the length of the screw. Since the screw has an axial channel, the maximum torque acts on its last turns, which leads to breakage of the screw.

The proposed device provides the manufacture of products, the wall thickness of which is equal to the height of the turns of the screw, since the height of the turn can be practically any, is achieved

manufacture of thin-walled products (the known device does not provide for the manufacture of long-length thin-walled products, this is due to the fact that with a decrease in the wall thickness of the product being pressed, the screw wall thickness decreases accordingly, its strength characteristics decrease and the screw breaks down). In addition, the proposed device provides for the manufacture of high-density products. The latter is explained by the fact that the auger is made without a central hole and has a strength greater than in the known rig. The high strength characteristics of the screw make it possible to transmit a greater torque and, therefore, to create a greater axial force, which ensures high-density products.

When the shell is assembled, the contact area of the un-removed part of the product with the surface of the shell will be minimal, which requires little effort to remove it, resulting in eliminating intense friction when removing the product at its contact with the inner surface of the tubular shell, which causes smoothing of the pores on the surface products, which degrades the performance characteristics of porous products.

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Claims (2)

1. A DEVICE for pressing tubular articles made of powder, comprising a housing with a hopper, an auger with a drive, a casing and a rod placed in the auger, part of which protrudes from the auger, so that In order to expand the technological capabilities of the device by obtaining long thin-walled products, it is equipped with a mandrel, an additional drive directed by 1m rigidly fixed in the housing, and the balls, the screw and the rod are made with annular grooves forming a groove for placing balls, the mandrel is mounted on the protruding part of the rod, the casing is connected with an additional drive and installed with the possibility of longitudinal movement along the guides, and the outer diameter of the mandrel is equal to the inner diameter of the screw. 2. The device according to claim 1, characterized in that, in order to improve the quality of the products, the casing is made of a team in three parts, one of which is fixed and the other two are mounted on the axles with the possibility of rotation relative to it, while the guides are placed in parts of the shell, installed with the possibility of rotation. 15 1366289 / 9-A /five