RU2604165C2 - Method of parts reconditioning by electroslag buildup - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention can be used for parts reconditioning by electroslag buildup. After part and metal mold fastening melting consumable electrode in form of package, assembled and welded from several metal bars, aligned along edge. Using rods, made from rolled stock appropriate by size and chemical composition, on which charge is applied. At least one of rods is extended from package and has sharpened end, charge is not applied to said rod.

EFFECT: invention provides extending range of recovered parts, will simplify supply of charge into melt.

1 cl, 1 dwg, 1 tbl

Description

The invention relates to the field of electroslag surfacing and can be used to restore parts electroslag surfacing.

A known method of restoring parts by electroslag surfacing (RF patent No. 2336971 C2, class B22D 19/10, B23P 6/00, B23K 25/00 from 01/12/2006).

However, this method requires the manufacture and installation of an alloy plate in the chill mold, which leads to a complication and cost of the process of restoring parts by electroslag surfacing.

The closest analogue is a method for restoring parts by electroslag surfacing, including fixing the part and the chill mold, melting the consumable electrode in the melt of the slag bath, manufacturing the consumable electrode from fittings assembled into a package of several rods in a shape corresponding to the size and shape of the chill mold, aligned at the end with the extended middle rod and fixed by welding (RF patent No. 2350449 C2, class B23P 6/00, B23K 25/00, B22D 19/10 of 05/08/2007).

However, the known method does not allow the use of any rolled products of suitable size and chemical composition as rods of a consumable electrode, and to feed the mixture uniformly with the consumable electrode into the melt. In addition, the known method does not always allow to successfully conduct a “solid” start operation of electroslag surfacing, since a “short circuit” between the consumable electrode and the restored part may occur, which will require removal of the electrode, re-preparation and start of the electroslag surfacing process.

The technical problem to which the invention is directed is to increase the productivity of the method for recovering parts by electroslag surfacing.

This problem is solved by the fact that in the method of restoring parts by electroslag surfacing, including fixing the part and the chill mold, melting the consumable electrode, made in the form of a package assembled and welded from several metal rods aligned at the end, while at least one of the rods is pulled out package, according to the invention, use rods made of suitable in size and chemical composition of the rolled product, which is applied to the charge, and use an extended bar with a sharpened end and not put a charge on it.

The use of any rolled products of suitable size and chemical composition as rods of a consumable electrode can significantly expand the range of products that can be used as rods of a consumable electrode

Fixing the charge to the rods allows to simplify the process of its feeding into the melt, as well as to make it uniform.

Sharpening the ends of one or more rods makes it possible to simplify the process of starting a “solid” operation of electroslag surfacing.

In FIG. 1 shows the initial stage of the method of electroslag surfacing of a tooth crown of an excavator bucket.

An example implementation of the method

In the mold 1, attached to the surfacing unit 2, install the restored part 5, for example, the tooth crown of the bucket of the excavator.

A prefabricated consumable electrode 4 is installed in the electrode holder 3. The electrode is made by welding into a packet of three metal rods aligned at the end with an extended middle bar. After welding, a mixture is applied to the extreme rods, an approximate composition of which is given in Table 1. The mixture is fixed, for example, with liquid glass, and then dried in an oven.

Using the drive of the electrode holder 3 of the surfacing unit 2, the sacrificial electrode 4 is moved towards the mold 1 until the consumable electrode 4 contacts the tooth crown of the excavator bucket 5. At this moment, the flux 6 and the consumable electrode 4 melt under the influence of electric current.

Melting is continued until the desired amount of metal is melted. After that, the consumable electrode 4 is withdrawn from the mold 1 and the surfacing unit 2 is turned off. After crystallization of the deposited metal, the restored tooth crown of the bucket of the excavator 5 is removed from the mold 1.

Unlike analogs, the proposed method allows you to use any rolled metal that is suitable in size and chemical composition as rods of a consumable electrode, to feed the mixture evenly with a consumable electrode and simplifies the “hard” starting operation of electroslag surfacing due to the sharpening of one of the rods of a consumable electrode , leading to an increase in current density during the starting operation and significantly simplifying it.

Claims (1)

A method of restoring parts by electroslag surfacing, including fixing the part and the chill mold, melting a consumable electrode made in the form of a package assembled and welded from several metal rods aligned at the end, while at least one of the rods is pulled out of the packet, characterized in that it is used rods made of suitable rolled products in size and chemical composition, on which the charge is applied, while the extended bar is used with a sharpened end on which the mixture is not applied.

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