SU1398987A1 - Injection mould for compacting articles from powder - Google Patents

Abstract

The invention relates to powder metallurgy and can be used in the molding of spherical powder articles. Preformed blanks, preferably of refractory powders, having specified dimensions and shape, such as a cylinder, are placed between parallel plates 3 into matrix strips formed by hemispheres 4 and notches 8 deformable pads 7. Under the action of the punch 9, the forming elements 3 approach each other at 1700-2200 With a pressure of 20-30 MPa billet pressed. When heated, the organic bond from the gaskets 7 is evaporated, and the boron nitride powder, from which the gasket is made, is squeezed out of the space through the absorption slots by the plates 3, the pressed blanks are compacted and take the form of a sphere. At the same time, a large number of spherical products are molded. The mold is easy to manufacture. 2 Il. kn & d (O eo eo

Description

The invention relates to powder metallurgy and can be used in the molding of spherical products from powder.

The purpose of the invention is to simplify the design and increase the productivity of the mold.

Figure 1 shows the mold,., Plan; figure 2 - section A-Ana figure 1.

The mold consists of a holder 1, matrix inserts 2 and forming elements made in the form of flat parallel plates 3, for example, a graphite, with hollows in the form of hemispheres A. In tiles 3 between hemispheres 4 there is a system of absorption slots 5 interconnected with each other and with the outer space of the worm with the allen grooves 6, made in the matrix inserts 2. Between the plates 3, a deformable gasket 7 is fixed with cylindrical leads 8, which form the matrix cavities with the hemispheres 4. Gasket 7 is made of non-cracked material, such as a mixture. boron nitride powder and organic binder,

Matrix cavities formed by

hemispheres 4 and cylindrical notches 8, fix from displacement in the horizontal plane by placing between the molds 3 and the holder 1 insert 2. The cross section area of the punches 9 is equal to the cross section area of the plates 3. The mold is as follows

Pre-molded blanks of refractory powders, shchuyushchie given the size and shape, such as cylinders, placed between the parallel plates 3 in the matrix cavity formed by the hemispheres 4 and cutouts 8 deformable gaskets 7.

Then, at 1700-2200 ° C and a pressure of 20-30 MPa, the blanks are pressed. Under the action of the punch 9, the mold elements 3 are brought closer together. When heated to a predetermined temperature, the organic bond from the gaskets 7 evaporates, and the boron nitride powder, from which the deformable gasket is made, is squeezed out through the absorption slots 5 and 6 from the space between the parallel plates 3.

The plates 3 come into contact with one another, the compression blanks are compacted and. take the form of a sphere.

The mold design allows you to simultaneously process a large number of spherical products with minor allowances for mechanical processing, it is easy to manufacture.

Claims (1)

Invention Formula A mold for pressing products from powder, mainly spherical products, containing a holder, forming elements in it in the form of plates with depressions filled in them, characterized in that, in order to simplify the design and improve the performance of the mold, it provided with deformable gaskets with cylindrical notches, made coaxially with recesses, and inserts with vertical grooves placed between the forming elements, the plates are arranged parallel and aligned with the absorption grooves E, coupled to each other and with vertical grooves inserts and recesses are in the form of hemispheres, together with cutouts obrazuyu1tsih matrix cavity. Editor A.Dolinich Compiled by A. Dzhetymov Tehred M. Didyk Proofreader I. Muska Order 2623/11 Circulation 740 VNIRPSH USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 FIG. 2 Subscription