SU1493418A1 - Method of recliming body of revolution surfaces - Google Patents

Abstract

The invention relates to the process of repairing machine parts and can be used in various industries in restoring the surfaces of rotating parts. The purpose of the invention is the expansion of technological capabilities by ensuring the restoration of surfaces having grooves. Establish a detail in the cartridge and press in the center. In the keyway set insert, made of highly electrically conductive material, for example, from bronze. The liner is inserted into the keyway with enough pressure to hold it in the part during rotation. The liner has a threaded hole to facilitate its removal from the key groove after the repair process has been completed. After installing the liner, a tape containing metal powder is fed onto the surface being repaired and welded to the surface of the part along the entire length. Since the insert is made of a highly electrically conductive material, the tape in the zone located above the insert is not welded to its surface. After the tape has been welded, the portion of the tape located in this zone is separated from its rest. The liner is then removed from the keyway, the height of which is restored. 6 Il.

Description

The invention relates to the technological processes of repair of machine parts and can be used in various areas of industry, in particular when recovering rotation surfaces from surfaces. .

 (The purpose of the invention is the expansion of technological capabilities by ensuring the restoration of surfaces.

having grooves, such as keyways.

FIG. 1 shows a setup diagram that implements the method, front view; in fig. 2 - the same, side view; in fig. 3 - worn restored part, cross section; FIG. 4 - the same, with a liner installed in the keyway; on

FIG. 5 - the same, with an insert overlapped with welded tape; Fig. 6 shows a detail, the outer surface of which and the height of the keyway is restored by welding the tape (liner removed), the cross section.

The device contains a base 1, on which the cartridge 2 and the center 3 are installed, in which a fec-mounted part 4 is fixed. On the base 1 with a possibility of longitudinal movement relative to the part 4, a caliper 5 is mounted. and 7 associated with a current source 8. The repair part 4 has a worn outer surface 9 (FIG. 3) and a keyway 10, reduced in height as a result of wear.

Dp implementation method install item 4; A cartridge 11 is made of highly electrically conductive material, such as bronze. The liner 11 has a threaded hole 12 to facilitate its removal from the keyway after the repair process has been completed. After installing the liner, a belt 13 containing metal powder is fed onto the surface being repaired, the belt is pressed against the surface of the part by applying rollers 6 and 7 to it in the radial direction, while simultaneously driving the part to rotation and supplying the rollers 6 and 7. Moving the rollers 6 and 7 to the caliper 5 from right to left (Fig. 1), the outer surface of the part is restored by welding the tape to it. After the surface of the part has been restored all over; the electric current is turned off, rollers 6 and 7 are removed from its surface and the rotation of the component 4 is stopped. Since the insert is made of highly electrically conductive material, the tape 13 does not weld to the surface above the insert the end of the welding of the ribbon is separated from the rest of it, leaving the surface of the liner open so that the part to be repaired after welding takes the form shown in FIG. 5. Then into the hole 12 of the fence

five

0

five

0

five

0

five

0

five

A threaded part is produced by which the insert 11 is removed from the keyway, which takes the form shown in FIG. 6. It can be seen that the outer surface of the part is restored, and the height of the keyway is reduced to the nominal value. To restore the inner surfaces of parts having keyway grooves, operations similar to those specified are performed.

Example 1. In the key groove of the part being repaired (shaft, pipe-electric electric arc mill), an insert is made of bronze BRNBT. The welding of the tape containing the compositions of П-Н70К17СЧЧЧ and ПГ-ФБХС-2 powders is carried out under the following conditions: welding current density 0.8 kA / mm; specific pressure of the surfacing roller 30 MPa; welding pulse duration 0.06 s; the duration of the pause between pulses is 0.18 s; welding speed 0.5 m / min; longitudinal feed of the surfacing roller4 MiVo6,

Example 2. In the key groove of the part being repaired (the shaft of the electric welding mill), the insert is made of BrNHK bronze. The welding of the tape containing the composition of powders PZH-ZS, PR-N70Kh17S4R4 and PG-FBh6-2, is performed under the following modes: welding current density of 1.2 kA / mm; specific pressure of the surfacing roller 50 MPa; welding pulse duration 0.10 s; welding speed 0.8 m / min; longitudinal feed roller 8 mm / rev.

Formula of invention

I,

The method of restoring the surfaces of the parts of rotation, which consists in winding a belt containing metal powder onto the surface of the part, pressing it against the surface of the part and producing an electric contact welding of the sheet to this surface, which is different in that restoring surfaces, imitating notches, before winding the tape into the notch, according to its shape, is flush with restoring 14934186

by pouring the surface of the installed material, and after welding the tape

The insert is highly electrically conductive to remove the insert from the recess.

1

Thebes 1

9

q) eja3

13

(rig 5

Claims (2)

The claims ¹ ' A method for reconstructing the surfaces of rotational parts, namely, that a tape containing metal powder is wound onto the surface of the part, pressed onto the surface of the part, and the tape is electrically contacted to this surface, distinguishing with the aim of expanding technological capabilities by providing restoration of surfaces having recesses before winding the tape into the recess, respectively its shape, is flush with the reconditioned surface of the material, and after welding the tape remove the liner from the high conductive extract the liner from the recess. Figure 1 FIG. 2 fi & z