RU1784470C - Screw press - Google Patents

Abstract

Usage: the manufacture of parts by sintering them from powders under pressure. SUMMARY OF THE INVENTION: a screw press comprises a cylindrical bed with a bottom and a cross member. A mold with punches is installed between them, the mechanism of its additional loading. The bed bottom and cross member are made with two coaxial holes symmetrical about the axis of the press. The cross member is made with a central hole. The additional loading mechanism of the mold is provided with a slider located in the central hole of the cross member and a pusher with rods placed in the coaxial holes of the cross member and the bottom of the bed. 2 ill.

Description

The invention relates to powder metallurgy, in particular to devices for sintering powders under pressure.

With a long duration of processes, maintaining the strength of the press is important. The hydraulic presses used for this purpose do not satisfy this requirement due to leaks of the working fluid from the cavity of the master cylinder. Replenishment of these leaks requires the use of complex and expensive regulatory equipment.

The closest to the claimed solution is a screw press for the study of materials with long exposures, which consists of a bed in the form of a hollow cylinder with a bottom and a movable cross-member screwed into it. The press is equipped with an additional loading mechanism. The advantage of this press is its small size and, consequently, its cost. The disadvantage is the rather lengthy loading (screwing up) and unloading procedure. Another disadvantage is the impossibility of compressing a press force therein with radial movement of the punches.

The aim of the invention is to simplify the use and expand the technological capabilities of the press.

This goal is achieved in that in a screw press comprising a cylindrical bed with a bottom and a cross-member connected with it by a thread, between which a mold with punches is mounted, its additional loading mechanism, the cross-section and the bottom of the bed are made with at least two coaxial holes symmetrical relative to the axis of the press, and the cross member is also made with a central., hole, the mechanism for additional loading of the mold is equipped with a slider placed in the central hole of the cross member and installed with possibly interaction with a punch, and a pusher with rods placed in coaxial

with

h

00

N xj

ABOUT

versts x of the cross member and the bottom of the bed and installed with the possibility of interaction with the mold.

In Fig 1 shows the proposed press in the context; Fig. 2 is a block of pushers used in conjunction with the press shown in fig. 1,

The press consists of a cylindrical bed 1 with a bottom screwed into it transversally 2, a slider 3 and a yoline from the bed of the plate 4. In the space between the plate and the cross-section, a mold is shown which consists of a holder 5 with sectors b mounted thereon, radial punches 7 and axial punches 8 The block of pushers (Fig. 2) consists of a plate 9 and rods 10 fixed in it.

The proposed press operates as follows

Using the additional loading mechanism (not shown in the drawings), the slider 3 is loaded with force F while the cross member 2 is screwed into the frame 1 until it contacts the axial punch 8. After removing the force F and removing the additional loading mechanism from the working space, the pusher block is installed in the hole 11 . After that, the proposed press is reinstalled in the working space of the additional loading mechanism and compresses the cross member 2 and plate 9. As a result, the clip 5 together with sectors b moves upward along the radial punches 7, forcing them to move to the axis. One of the punches 7 simultaneously moves e direction perpendicular to the plane of the drawing, from the observer, and the other to the observer After reaching the specified pressure in the mold cavity, the proposed press can be removed from the working space VA mechanism of additional loading and pressure in the cavity of the mold will be maintained for an indefinitely long time, because the thread pitch on the cross and the angle of inclination of the inner surfaces of the sectors 6 provide self-braking

Removing the load and disassembling the press is as follows

The block of pushers is installed in the hole 12 in the cross member 2 and using

the additional loading mechanism, the clip 5 is moved with sectors 6 down. The pressure in the mold cavity is thereby reduced. However, the axial punches 8 remain wedged between

a stove 4 and a cross-beam 2 of quite considerable force. Therefore, after removing the block of pushers from the holes 12, the proposed press is again placed in the working space of the additional mechanism

loading and the slider is pressed by force FI F, while the stress in the threaded connection of the bed-cross-member is reduced and the cross-section is unscrewed by a certain angle After removal

of the proposed press from the space of the additional loading mechanism, the first is disassembled

The proposed press can also be used for long exposures under

load of conventional axial compression molds. For this there is no need to use a block of pushers

Claims (1)

SUMMARY OF THE INVENTION A screw press comprising a cylindrical bed with a bottom and a cross-section connected thereto by a thread, between which a mold with punches is mounted, a mechanism for its additional loading, characterized in that. in order to simplify operating conditions, the cross member and the bottom of the bed are made with at least two coaxial holes symmetrical to the axis of the press, and the cross member is also made with a central hole, the additional loading mechanism of the mold is equipped with a slider located in the Central hole of the cross member and installed with the possibility of interaction with the punch, and a pusher with rods located in the coaxial holes of the cross member and the bottom of the bed and installed interacting with the mold 12 12 o cput Z