RU2343216C2 - Technique of babbit-metal alloys receiving - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: technique includes melting of alloy components and pouring, at that it is implemented jointly or separately components grinding into powder with further blending in following ratio, wt %: Babbitt-metal alloy of brand "Б"-76 - 18.3 and Babbitt-metal alloy of brand "Б"-83 - 18.3, tin in the form of tin-lead solder-40 - 8.5 and tin in the form of tin-lead solder-60 - 8.5, standard tin - 13.4, refined copper - 16, sulfuric potassium - 3, zinc - 2.5, manganese - 1.6, lead - 1.4, silver - 0.9, aluminium - 0.6. Melting of received mixture is implemented in crucible with periodical mixing with receiving of alloy with crystallisation temperature 70°C and melting higher than 300°C. Alloy teeming is implemented into molds in the form of rods of round or square section by diameter or thickness 7-10 mm.

EFFECT: reduction in price of modification technology, improvement of mechanical and operational properties of Babbitt-metal alloys.

Description

The invention relates to metallurgy, and in particular to methods of extra-furnace production of babbitt alloys, which allows to reduce the cost of technology and improve the mechanical and operational properties of babbitt alloys, which can be used in mechanical engineering.

A known method of modifying cast irons and steels [1], including the introduction of a modifier containing refractory dispersed particles and tread substances. Before introduction, the modifier and tread are subjected to simultaneous crushing, activation and planning of refractory dispersed particles to obtain a powder; they are obtained by co-grinding refractory dispersed particles and tread substances in the following mass ratio: refractory dispersed particles - 50-90%; protector substance - the rest.

The disadvantage of this method is the complex technology of introducing powdered substances into the molten metal.

A known method of producing babbitt and ligature for its implementation [2], adopted as a prototype, including the melting of the secondary babbitt and ligature based on lead in a ratio of 0.22 + 4.00 wt. to 10.00 parts by weight secondary babbitt and melting are carried out at a temperature of 450-480 ° C. The master alloy for producing babbitt contains copper and antimony and is characterized in that it contains tin and lead in the following ratio of components, wt.%: Copper 5-15; antimony 15-17; tin 15-17; lead is the rest.

The disadvantage of this method is the high melting point.

The objective of the proposed technical solution is to simplify the technology for producing babbitt alloy with physical and mechanical properties: viscosity, crystallization at a temperature of 70 ° C and melting at a temperature above 300 ° C.

The problem is solved in that they carry out joint or separate grinding of the constituent components to powder, followed by mixing in the following ratio, wt.%: Babbitt alloys - 36.6% of grades B-76 - 18.3%, B-83 - 18.3 %; tin 17% in the form of POS-40 - 8.5%; POS-60 - 8.5%; pure tin - 13.4%; refined copper - 16%; potassium sulfate - 3%; zinc - 2.5%; Manganese - 1.6%; lead - 1.4%; silver - 0.9%; aluminum - 0.6%, the mixture is melted in a crucible with periodic stirring, obtaining an alloy with a crystallization temperature of 70 ° C and melting above 300 ° C, and the alloy is cast into casting molds in the form of round (square) bars with a diameter (thickness) 7-10 mm.

The essence of the method consists in crushing constituent metals and substances to a powder, mixing them, filling in a crucible, melting the mixture with periodic stirring.

The mixture is obtained by joint or separate grinding of the constituents of the complex in the following ratio, wt.%: Babbitt alloys 36.6% grades B-83 - 18.3%; B-76 - 18.3%; tin 17% in the form of POS-40 - 8.5%; POS-60 - 8.5%; pure tin 13.4%; refined copper 16%; potassium sulfate 3%; zinc 2.5%; Manganese 1.6%; lead 1.4%; silver 0.9%; aluminum 0.6%.

The casting of the alloy is carried out in casting molds in the form of rods of round (square) section with a diameter (thickness) of 7-10 mm.

Salient features of a technical solution are:

the mass ratio of the components of the components of the mixture, presented in powder form;

the mixture is obtained by joint or separate grinding, followed by mixing the powders of the constituent components;

melting of the mixture is carried out in a crucible with periodic stirring, obtaining an alloy with a crystallization temperature of 70 ° C and melting above 30 ° C;

the mixture is cast into casting molds of round (square) section with a diameter (thickness) of 7-10 mm.

Comparison of the claimed technical solution with the prototype allows us to establish its compliance with the criterion of novelty. The resulting alloy has new properties: crystallization temperature of 70 ° C and melting above 300 ° C.

The set of essential distinguishing features is not identified from the existing level of technology, but allows us to solve the problem, as well as to conclude that the claimed technical solution meets the criterion of "inventive step".

The inventive method was tested when restoring the bearing seats, where the viscosity requirements are imposed on the reducing agent material, the bearing heating temperature should not exceed 80 ° C, and for applying the material to the deformed surfaces, the temperature of 300-400 ° C and alloy rods, which were prepared in a crucible from mixtures of powders contained in a muffle furnace for 30-40 minutes and poured into molds in the form of rods of round (square) section with a diameter (thickness) of 7-10 mm. The obtained test data for alloy samples confirmed the crystallization temperature of 70 ° C and melting point of 340 ° C.

Literature

1. RF patent №2121510. The method of modifying cast irons and alloys / A.N. Cherepanov, V.A. Poluboyarov, M.F. et al. M.cl. C21C 1/00, 7/00; C22C 35100. Post. 11/21/98.

2. RF patent No.2001963. The method of obtaining babbitt and ligatures for its implementation. IPC С22С 1/03, 11/00. Will declare. Control East Siberian railroad Fig. N.N. Ratnichenko. Claim 07/17/1992.

Claims (1)

A method of producing babbitt alloys, including melting the constituent components of the alloy and casting, characterized in that they carry out joint or separate grinding of the constituent components to a powder, followed by stirring in the following ratio, wt.%: B-76 grade babbitt alloy - 18.3 and babbitt alloy grade B-83 - 18.3, tin in the form of POS-40 - 8.5 and tin in the form of POS-60 - 8.5, pure tin - 13.4, refined copper - 16, sulfuric acid potassium-3, zinc is 2.5, manganese is 1.6, lead is 1.4, silver is 0.9, aluminum is 0.6, and the mixture is melted in a crucible with stirring to obtain an alloy with a crystallization temperature of 70 ° C and melting above 300 ° C, and the casting of the alloy in the form of rods is carried out in casting molds of round or square cross section with a diameter or thickness of 7-10 mm.