SU123705A1 - A method of making tubes and rods of refractory non-ductile materials - Google Patents

Description

In the manufacture of blanks and products of large dimensions by the method of pressing them from the peas, it is not possible to ensure a uniform mass density over the entire cross section of the workpiece (article).

The described method of manufacturing tubes and rods of refractory non-elastic materials provides billets with uniform density throughout. This is achieved by using a two-stage extrusion in a single die, and first by pressing, using a friction force, a preform is made, which is then shaped and pressed using the mouthpiece pressing.

The described method is suitable for the manufacture of products from any refractory and non-ductile metals and materials, including carbides, borides, silicides, and other compounds of molybdenum, tungsten and other refractory metals.

Before pressing, starch paste is added to the powdered mixture of the starting materials at the rate of 3-4 Si organic binder; the mixture is rubbed through a sieve with cells with a side of 0.5-1.5 mm, and then dried under vacuum. The mixture prepared in this way is loaded into a mold consisting of a die / (see drawing), mounted on pre-compression ring 2. The ring is put on the compound puapson, which consists of needle 3 and rod 4. The punch is centered in mouthpiece 5 by means of sleeve 6 Thereafter, the mixture is pre-pressed by friction forces, after which the compression ring 2 and the sleeve 6 are removed and the die is attached to the die 5 by means of a nut 7.

Then, a mouth-press extrusion is performed by forcing the pre-pressed mixture through the opening 8 of the mouthpiece 5 formed after removing the sleeve 6 from the mouthpiece.

The pipe or rod blanks made by the method described above are subjected to two-day drying and the subsequent sieveing of the mode established in each individual case with respect to the composition of the mixture and the nature and configuration of the product.

The method was developed at the Institute of Metal Ceramics and Sieslavlavs of the Academy of Sciences of the Ukrainian SSR.

Subject invention

A method of manufacturing tubes and rods of refractory non-plastic materials, characterized in that, in order to obtain products with uniform density in its entire volume, two-stage pressing is used in one matrix, first of all from the original powder with plasticizer added to it by means of friction forces the preform is made, then it is made. using the method of mouth pressing give the proper size and shape.