SU1079458A1 - Apparatus for moulding cylindrical articles from pulverulent materials - Google Patents

Abstract

DEVICE FOR FORMING CYLINDRICAL PRODUCTS OF POWDER MATERIALS, containing, matrix, encompassing, coaxial upper and lower coaxially, installed by means of a mounting plate on a vibrating table, punches, characterized in that, in order to intensify compaction processes and improve the quality of products, products have quality. mounted on the mounting plate symmetrically to the vertical axis of the punches with racks with horizontal pins, and the matrix is made with grooves on the outer surface for placing the ends the last one, the slots are angled 5-45 ° to the vertical forming surface of the matrix. (L ate oo

Description

The invention relates to the manufacture of articles from powder materials.

A device for forming cylindrical articles from powder materials is known, which comprises a matrix enclosing coaxial upper and lower punches 1 installed by means of a mounting plate on a vibrating table.

The disadvantage of this device is the uneven density of cylindrical products in a plane perpendicular to the direction of propagation of the main loads, and over the surface of the outer diameter of the product.

Closest to the invention is a device for molding articles from powder materials, comprising a matrix enclosing the coaxial upper and lower mounted punches 2 mounted by means of a mounting plate on a vibrating table.

The said device is characterized by an insufficient intensity of the compaction processes and a low quality of the molded products.

The aim of the invention is to intensify the compaction processes and improve the quality of cylindrical products by the effect of torsional vibrations.

This goal is achieved by the fact that the device for forming cylindrical articles from powder materials, containing a matrix covering the upper and lower coaxial axes of the punches installed by means of the mounting plate on the vibrating table, is equipped with racks mounted on the mounting plate symmetrically to the vertical axis of the punches grooves on the outer surface to accommodate the ends of the latter, the grooves being inclined at an angle of 5-45 ° to the vertical forming surface of the matrix.

FIG. Figure 1 shows schematically an apparatus for forming cylindrical articles from powder materials, a general view; in section; in fig. 2 is a view A of FIG. one.

A device for forming cylindrical articles from powder materials consists of a vibrating table 1, an assembly 2, a matrix 3 covering the upper punch 4 and a composite lower punch made of coaxially arranged inner 5 and outer 6 elements. On the surface of the matrix 3 grooves 7 are formed at an angle L of 5-45 ° to the vertical forming surface of the matrix 3. On the mounting plate 2

symmetrically to the vertical axis of the punches are fixed racks 8 with horizontal pins m-and 9 and rolling bearings JO, which are located in the slots 7.

A device for forming cylindrical articles from powder materials works as follows.

The powder mass is poured into the matrix installed on the vibrating table 1 and an initial force P is applied through the upper punch 4. The vibrating table I oscillates in a vertical plane, as a result of which the device and the product are subjected to vibration-shock loading and the matrix 3 returns - the available twisting movement. When the vibrating table 1 moves upwards, the matrix 3 moves upwards, thus obtaining acceleration of the vibrating table. Having reached a displacement equal to the amplitude of oscillations, the vibrating table 1 begins to move downwards, and the matrix 3 under the action of an inertial force equal to F, where WH is the mass of the matrix 3;

in-st is the acceleration of the vibrating table 1, moving upwards relative to the vibration table 1. The pattern of movement of the matrix 3 is determined by the angle of inclination of the groove 7 -b (. Under the influence of the inertial force FHH and tangent to the diameter of the force product Fit btg, the matrix 3 makes a twisting movement upwards. the matrix particles of the powder material are subjected to complex torsional loads and move, occupying the least compacted areas.

When the extreme lowest point of the groove 7 is reached, the die 3, together with the vibrating table 1, moves downwards. Reaching the original

5, the vibrating table 1 stops, and the product is subjected to axial loading from the force P and the force of inertia of the upper punch 4, as well as torsional loading on the cylindrical surface from moving the matrix 3 down. In one stroke of the vibrating table 1, the product is subjected to additional vibration torsional loads applied to the cylindrical surface.

Using the proposed device with torsional vibrations of the die without using an additional drive to move the die 3 allows to intensify the compaction process, to improve the quality of the molded products by increasing the relative equal density and 0 maximum density of the product.

Claims (1)

DEVICE FOR FORMING CYLINDRICAL PRODUCTS FROM POWDER MATERIALS, containing a matrix covering the coaxial upper and lower punches installed by means of a mounting plate on a vibrating table, characterized in that, in order to intensify the compaction processes and improve the quality of products by the action of torsional vibrations, it is equipped with fixed plates symmetrically to the vertical axis of the nounsons with racks with horizontal pins, and the matrix is made with grooves on the outer surface to accommodate the ends of the latter and the grooves are inclined at an angle of 5–45 ° to the vertical generatrix of the matrix surface. Fig!