SU1357134A1 - Installation for continuous compacting of double-layer articles from powders - Google Patents

Abstract

The invention relates to installations for the continuous pressing of two-layer articles from powders. The goal is to improve the quality of products by increasing the adhesion surface of the layers. In the hoppers 12 fall asleep powders. Gearmotors 11 rotate the augers 10, transporting the powders to the mold zone (L co-eled with 4 ::

Description

This is limited to a part of the inner surfaces of the housings 3 and 4,: by the hinges 5,6 and 7 and by the die 2. In this zone, the powders are pre-compacted and enter the tight sealing part of the die 2. with screws 10 placed in them, make an independent angular oscillatory movement in sectors 1-5 mounted on base 1 and joint 1

1 The invention relates to powder metallurgy, in particular, to installations for the non-linear pressing of two-layer articles of powders.

The purpose of the invention is to improve the quality of products by increasing the adhesion surface of the layers.

The ba of FIG. 1 shows an installation for the continuous extrusion of two-layer powder articles, top view, section view; figure 2 - section aa in figure 1; Fig. 3 is a structural scheme for controlling the operation of the movement mechanisms and gearmotors rotating the augers.

The plant for continuous pressing of two-layer powder products contains a base 1, on which matrix 2 is installed. Cases 3 and 4 are connected to the matrix by means of hinges 5, and connected to each other by means of hinges 6 and 7, to the top plate 8 and intermediate plate 9. Inside the case there are screws 10 connected to gearmotors 11. Each case is equipped with a hopper 12. The intermediate plate is rigidly connected to the die and base. Motor gearboxes 1 3 are rigidly fixed to the housings and kinematically, by means of a gear train 14., are connected to fixed sectors 15 located on the base of the research institute. Each sector at the ends has stops 16. Motion sensors (not shown) are mounted on the stops 16. The operation of gear motors -P and 13 is controlled from block 17

driven through gears with gearmotors mounted on housings 3 and 4. Commands for switching on, switching off and reversing gearmotors are supplied from the program control unit. With this movement of the housings, a developed layer adhesion surface is obtained, which leads to an increase in the shear adhesion strength of the layers. 1 hp f-crystals, 1 tab., 3 ill.

program control in accordance with a given program.

The installation works as follows.

The hoppers 12 continuously flow powders of various chemical compositions. The motor-reducers 11 rotate the screws 10. Through screw cutting of the screws 10, the powders are transported to the molding zone, which is limited by the internal surfaces of the housings 3 and 4, the hinges 5-7 and the die 2.

In the molding zone, the powders are pre-compacted and enter the pre-compacting part of the orifice of the die 2. The pressed two-layer product is pressed out of the calibrating part of the die 2 by the action of the pressing force. independent angular oscillatory movement along fixed sectors 15. The angular movement of bodies is carried out by gearmotors 13. Commands for switching on, off and reverse gearmotors 13 are supplied from block 17 of the gram control. At the moment when one of the bodies is parallel or perpendicular to the axis of the product, signals from motion sensors (not shown) mounted on the stops 16 are fed to the software control unit.

With independent oscillatory angular displacement of the housings during the molding process, a developed bonding surface is obtained.

laziness making layers. The contact line of the component layers in the axial section. The product is a periodic curve, and its steepness depends on the period of angular oscillatory movements of the housings 3 and 4. The shorter the period, the greater the steepness of the contact line, i.e. the more developed adhesion surface of the constituent layers is the finished product.

The table shows the results of testing the adhesion strength of the component layers on the shear in the axial direction of the products obtained on the well-known installation and on the proposed one (two samples with identical cross-sectional dimensions and the same ratio of the thicknesses of the components

In addition, the software control unit allows you to adjust the flow of powders of various chemical compositions to the forming zone by changing or maintaining in a given proportion the rotational speed of the motor-reducer I1 during the entire molding process according to a given program. As a consequence, it is possible to obtain two-layer products from

The material of the constituent layers

PZh2 iron powder and PNK1L5 nickel powder

PNK1L5 nickel powder and PMS-1 copper powder

344

powders with a developed adhesion surface and with a smoothly varying ratio of the average thickness of the constituent layers along the length of the product or with a constant ratio

Claims (2)

Invention Formula I. Installation for continuous pressing of two-layer powder products, comprising a base, a housing, screws with rotational drives and a die, characterized in order to improve product quality by increasing the adhesion surface of the layers, it is equipped with a control unit, the housing is filled in two separate elements, equipped with mechanisms for their independent angular displacement relative to each other, and the screws are placed in the elements of the housing. 2. Installation according to claim 1, about tl, which means that the moving mechanism is made in the form of a sector mounted on the base, and a gearmotor mounted on the housing and kinematically connected to the sector. The shear strength of the tested samples C, Pa, -produced at the facility known proposed 3.53-10 ° 4.32-10 3.34-10 4.51MO 22.38 35.03 Fig.Z