SU1752520A1 - Sintered composite article manufacturing method - Google Patents

Abstract

Use: manufacture of bimetallic abrasive-diamond working element of the wire saw. SUMMARY OF THE INVENTION: pressed blanks from powders of heterogeneous materials, assembled with the placement of porous sleeves of material that have solubility in the materials of the blanks adjacent to the sleeve, and assemblies are placed into the shell with ceramic porous spacers between them. 3 il.

Description

The invention relates to powder metallurgy, in particular, to methods for making sintered composite articles, preferably abrasive diamond elements for a wire saw.

The purpose of the invention is to simplify the technology, increase the productivity and adhesion strength of the layers.

This goal is achieved by separately pressing the inner and outer cylindrical blanks of powders of dissimilar materials, assembling them with an intermediate layer and hot plastic deformation between them, with the porous bushing of the material having the solubility in the outer and inner blanks being used as the intermediate layer. , before the hot deformation, the preform assembly is placed in a shell, and their laying in the shell is carried out, a series of ceramic porous gaskets s.

Figure 1 shows a composite composite billet, figure 2 - scheme of extrusion of the workpiece; on fig.Z - pipe products.

The rod 1 is made in the form of a sleeve. The workpiece has an intermediate 2 and outer 3 layers, the shell 4 and the gasket 5.

The extrusion scheme of the composite billet (FIG. 2) shows container 1, die 2, holder 3, punch 4, counter rod 5, rod 6. inner 7, intermediate 8 and outer 9 layers, shell 10 and gasket 11. FIG. 3 shows tubular products after hot extrusion and cleaning from the ceramic shell, having an inner 12 intermediate 13 and an outer 14 layer.

PRI me R. On a hydraulic press, two-sided static pressing of bushings with a height of 3.8 mm was made from powders: steel 40X with an inner diameter of 5.1 mm, an outer diameter of 8.9 mm under a pressure of 400-450 MPa to a porosity of 30%; nickel with an inner diameter of 9 mm, an outer diameter of 11.9 mm under a pressure of 400–450 MPa to a porosity of 30%, as well as a diamond-bearing charge

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(80% Cu + 20% Sn + diamond powders of mark АС15 with grain size 315/250) with an inner diameter of 12 mm, outer diameter of 18 mm, under a pressure of 300-350 MPa to a porosity of 30% and ceramic powder (40% by weight of chalk + 40% .% lithographic stone, basalt or tuff + 20% by weight of glass grade АС-1) + 20-25% by weight of liquid glass with an internal diameter of 5.1 mm, an external 18 mm and a height of 1 mm under a pressure of 300 MPa to a porosity of 30% . At the same time, shells were made of ceramic powder with an inner diameter of 18.1 mm, an outer diameter of 24.5 mm, and a height of 40 mm under a pressure of 300 MPa to a porosity of 30%.

After Assembly in figure 1, the preform is heated to the extrusion temperature (750-800 ° C). incubated for 25 minutes and subjected to extrusion with a Yi 3 stretching ratio. Heating is performed in a protective medium (argon, hydrogen, etc.). After extrusion by mechanical means or by dissolving in water, the shell is cleaned and diamond tips are separated from each other.

With a container height of 60 mm, a shell with a height of 40 mm is used, inside which 7 pre-fabricated pieces for diamond tips are placed, and with a container height of 100 mm, a shell with a height of 800 mm is used, within which 15 pre-fabricated pieces are placed.

The obtained extruded composite product has a uniform thickness of steel (δ 0.8 mm), nickel (3 0.7 mm) and diamond-bearing (5 1.55 mm) sleeve layers along the entire length in any section and stable adhesion strength of the layers in these sections x (gsrez 300-320 MPa), whereas the diamond tips made by a known method, gsrez

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180-200 MPa. In addition, the y-diamond tips obtained by a known method, during the extrusion process, disturbed the integrity of the prefabricated billet due to the premature expiration of the diamond layer.

High strength properties in transition layers are explained by good dissolution of the metal of the intermediate layer.

0 (nickel) in the outer (80% Cu + 20% Sn + diamond powders) and the inner layer (steel 40X) with the formation of a solid solution based on copper and iron.

Claims (1)

According to the optimal modes of the proposed method, a batch of diamond composite tips was made, the factory and laboratory tests of which showed that they are 1.4–1.6 times more efficient than the tools made by a known method. The invention The method of manufacturing sintered composite products, mainly abrasive diamond elements of the wire saw, 5 including separate pressing of the inner and outer cylindrical blanks of powders of dissimilar materials, their assembly with an intermediate layer between them and hot plastic deformation, characterized in that, in order to simplify the technology, increase the productivity and strength of adhesion of the layers, during assembly as intermediate layer use porous 5, a sleeve made of a material that has solubility in the materials of the outer and inner blanks is placed into the shell before the hot deformation of the assembly, and laying them into the shell is 0 water t, a series of ceramic porous gaskets. (ptttl 12 ft . 14