Plating on barrels made of metal powders

FIELD: metallurgy.

SUBSTANCE: invention concerns method of operating layers receiving on surfaces of hollow barrels and can be used for bimetallic sleeves manufacturing with coating simultaneously on internal and external surfaces or only on external surface, and also for such details recovery. In detail wall there are implemented radial canals, then sintered batch is placed in its chamber. Detail is implemented lengthwise less than matrix length and installed with specified radial clearance into matrix by means of end cover with forming of end air clearances. Assembly is rotated about axis with simultaneous heating till mixture melting temperature. In covers there is implemented at least one hole connecting matrix chamber to atmosphere on radius equal to difference between external detail surface and hole. Heating is ended as only from hole it is start splash of melted metal.

EFFECT: covering refining at the expense of probable air inclusion formation in working layer of weld removal and discard is eliminated.

1 dwg

 

The invention relates to methods for operational layers on the surfaces of hollow cylindrical parts and can be used for the manufacture of bimetallic barrels coated simultaneously on the inner and outer surfaces or only the outer surface, as well as to restore such details.

The known method of applying metal coatings on the outer surface of the parts, including the loading mixture in the form of its rotation and the heating and the rotation of the forms set out the terms of uniform distribution of the molten metal on its surface, and then enter into the form, detail, and speed form slow to a value sufficient to fill the melt gap between form and detail (RF patent No. 2193077, publ. 20.11.2002, bull. No. 23).

The disadvantage of this method is the impossibility of obtaining work layers simultaneously on the inner and outer surfaces of the part.

As the closest analogue is selected, the method of coating of metal powders on a cylindrical part, including the location of the coating material in the plane of the part, its rotation around the axis with simultaneous heating to the melting temperature of the coating material, and the wall parts are radial channels, and the detail set in a matrix with a certain clearance to the workpiece (A.S. No. 1260119 publ. 30.09.86, bull. No. 36).

The disadvantage of this method is a strong possibility of marriage because of the formation in the outer working layer covering the air bubbles. This is due to the fact that in order to prevent splash of the molten metal, Assembly (item matrix) should gather tightly, which causes the air trapped in the gap between the part and the matrix is pressed and locked the molten metal at the outer surface part, without the possibility of release into the atmosphere.

Technical task, which directed the claimed technical solution is to improve the quality of the coating by eliminating possible air bubbles in the weld working layer and the exclusion of marriage for this reason.

The specified technical task is solved in that in the method of coating of metal powders on a cylindrical part, including the execution in the wall of the part of the radial channels, placed in the cavity of the powder charge, the installation details in a matrix with a given radial clearance, the rotation of the Assembly around the axis with simultaneous heating to the melting temperature of the charge, unlike the prototype item perform length less than the length of the matrix and set it to the matrix through the end cap with the formation of end air gaps, and covers performed by Rina least one opening connecting the cavity of the matrix with the atmosphere, on the radius, equal to the difference of the radii of the outer surface of the parts and holes, and the heating is stopped as soon as out of the hole begins splash of molten metal.

The proposed method ensures the production of high quality coatings by eliminating the possibility of air bubbles in the fused layer of the outer surface of the part. Since under the action of gravity melt the air is expelled them and pressed against the outer surface of the workpiece, the end clearance provides unobstructed exit back this air. However, under the action of centrifugal forces following the air at the end clearance could be replaced and the melt. Therefore, the hole made in the end centering the lid, when the splash of melted metal gives information about the completion of the deposition process and the need to end the heating process.

The invention is illustrated in the drawing, which shows a General scheme of the method.

The method is as follows. A cylindrical part 1 with radial channels 2 perform in length less than 3 matrix. In the cavity part 1 download powder mixture and set in the rotator through the end cap 4. Include rotator and simultaneously generators is Thor HDTV and using the inductor 5 is carried out, the heating and melting of the powder charge. The molten metal 6 under the action of centrifugal force penetrates through the radial channels 2 in the radial gap formed by the outer surface of the part 1 and the inner surface of the matrix 3, displacing the air in the mechanical air gap Δ. After filling in all radial clearance melt 6 he will be replaced in the end the air gap Δthat will cause it to splash into the atmosphere through the opening 7 in centering the cover 4. The heat immediately cease and after cooling, the Assembly is dismantled. On the outer and inner surfaces of the part are formed compact layers of high quality. The hole 7 in the end cap 4 matrix perform on the radius, equal to the difference of the radii of the outer surface of the parts and holes, ie,

R=Rd-Rresp,

where Rdis the radius of the outer surface of the workpiece;

Rresp- the radius of the hole.

Thus, the proposed method is compared with the prototype ensures that the welding of the outer working layer details without the formation therein of air cavities, leading to marriage coverage.

The method of coating of metal powders on a cylindrical part, including the execution in the wall of the part of the radial channels, the placement in the uterine cavity of a powder charge, installation details in a matrix with a given radial clearance, the rotation Assembly vatrogasci with simultaneous heating to the melting temperature of the charge, characterized in that the item performs in length less than the length of the matrix and set it to the matrix through the end cap with the formation of end air gaps, and covers perform at least one opening connecting the cavity of the matrix with the atmosphere, on the radius, equal to the difference of the radii of the outer surface of the parts and holes, and the heating is stopped as soon as the hole begins splash of molten metal.



 

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