The method of restoring worn parts

 

The invention relates to welding technology can be used in the repair and restoration of worn parts by welding. Item fix, having horizontally worn areas. Set recumbent electrode with a gap over the worn area with the formation of an electric arc and carry out the welding. The gap between the electrode and the surface deposition exhibit put on by the split electrode rings of insulating material with a low resistance. When restoring wheel dredger with worn sites located in different planes, a wheel fixed on the axle, which have horizontally and vertically by surfacing the blade and on the sides of the wheel cavity. Turn the wheel about the axis for welding, consequently, blades and separated by the blade sections of the sides of the cavity. The cladding of each blade perform electrodes, bent at an angle less 90opositioning them on each blade along the axis of the wheel. The cladding of each of the sections of the cavity wheel perform straight electrodes, which are sequentially injected into the cavity. Have them over the next surfaced strip uchastki bands of small lengths. The technical result is to create a simple, mobile, convenient and reliable way, which receive a high quality weld surfaces when restoring the worn surfaces of the wheel dredger and other parts with similar surfaces wear. 5 Il.

The invention relates to welding and can be used to restore worn parts lying electrode.

There is a method of welding a recumbent electrode, providing for the welding of parts with curved surfaces (see and. C. SU 66582, 1946). In the method details rotate the drive current supply to the electrode is carried out in several points, and pinning it to the surface of the welding perform copper rollers associated with welding cable. However, in the way to bed electrode is welded contacts that violates the welding mode and reduces the quality of the welding.

The closest analogue is a method of restoring worn parts, in which the part is fixed, having a horizontally worn areas, establish recumbent electrode with a gap over the worn area with the formation of an electric arc and are surfacing (see U.S. Pat. EN 2133177, CL 23 To 9/04, 1998).

The objective of the proposed method is to improve the facilities operation when restoring parts with complex surfaces wear, improving the accuracy of setting the clearance between the electrode and fused surface while improving the quality of welding, increase life and reduce repair costs.

To solve this problem in the proposed method of restoring worn parts, in which the part is fixed, having a horizontally worn areas, establish recumbent electrode with a gap over the worn area with the formation of an electric arc and are surfacing, according to the invention the gap between the electrode and the surface deposition exhibit put on by the split electrode rings of insulating material with a low resistance, and when restoring wheel dredger with santalina and vertically by surfacing the blade and on the sides of the cavity wheel, and turn the wheel about the axis for welding, consequently, blades and separated by the blade sections of the sides of the cavity, with the surfacing of each blade perform electrodes, bent at an angle less 90opositioning them on each blade along the axis of the wheel, and the cladding of each of the sections of the cavity wheel perform straight electrodes, which are sequentially injected into the cavity and have over the next surfaced strip of land, whichever is longer find the length of each of the electrodes, and use one electrode on several strips of small lengths.

The technical result of the proposed method is to create a simple, cost-effective, flexible and mobile way of surfacing, allowing a small number of installation sites and workshops to repair parts with complex surface wear, such as wheel dredgers, and to increase the operating life time.

In Fig. 1 shows the location of the wheel dredger for surfacing frayed sides of the cavity (front view).

In Fig. 2 shows the location of the wheel dredger and electrode electrode holder for welding of worn is a holder for surfacing of one of the sections of the cavity wheel.

In Fig. 4 shows the location of the wheel dredger for surfacing of worn blades (front view).

In Fig. 5 shows the location of the wheel dredger and electrode electrode holder for welding frayed blades (side view).

On the wheel 1 dredger wear out the sides of the cavity 2 of the wheel 1 and the blade 3. When restoring frayed wheel 1 is fixed on the axis 4, 4'. When overlaying the lateral sides of the cavity 2 of the wheel 1 is installed with a vertical position of the wheel axle (see Fig. 1, 2). The welding of the blades 3 is performed with the horizontal axis position (see Fig. 3). When restoring the sides of the cavity 2 welding perform straight electrodes 5, which are placed on the strips 6 welding. Restoring frayed blades 3 perform electrodes 5', bent at an anglelower 90o. The electrodes 5, 5' is fixed respectively in the elds of application 7, 7' and come with a clearance of 8 over the worn surface. A gap of 8 exhibit attached to the electrode with split rings 9, 9' of insulating material with a low resistance. When the cladding is formed rollers 10,10'.

The method consists in the following.

The impeller semna the ins and low wear resistance. During rotation of the wheel and continuous friction through its cavity aqueous mixture of sand and stones the surface of the wheel intensively wears out. Special wear-prone in contact with the working mixture of the surface - side 2 (cheeks) of the inner cavity of the wheel 1 and the upper (outer) parts of the blades 3 of the wheel 1, which in the process, push the mixture from the pump dredger.

When restoring the worn surfaces of the wheel 1 dredger is fixed on the axis 4.

The welding of the sides of the cavity 2 of the wheel 1 is performed with the setting wheel with vertical axis 4 (see Fig.1, 2). The areas of the sides of the cavity are separated by the blades 3 and alternate recovery wheel rotates about an axis that allows you to improve the usability and quality of welding.

The cladding of each of the sections 2 of the hollow wheel 1 perform straight electrodes 5, which are sequentially injected into the cavity 2 and equipped with a gap 8 on the next strip cladding (see Fig.3) to fill the plot surfaced rollers 10. The length of the electrode 5 is selected for the longest strip 6 welding. For surfacing a few small strips of lengths using one electrode. This is achieved HC is belt driven reduction of metal consumption and cost.

When overlaying the frayed blades 3 wheel 1 is fixed to the horizontal position of the axis 4. For alternate recovery each blade wheel rotates about the axis.

The cladding on each blade perform electrodes 5', bent at an anglelower 90othat come with the gap when welding on each blade along the axis of the wheel (see Fig.5). This improves the ease of use when restoring hard-to-reach areas.

Surfaced areas of the blades are curved cylindrical grooves formed in the process of dredging on the upper (inner) surface of the blades. When surfacing they subsequently filled surfaced rollers 10'.

The gap 8 between the electrodes 5, 5' and the surfaces of the welding cavity and blades exhibit attached to the electrodes 5, 5' of the respective split rings 9, 9' of insulating material with low resistance, which reduces the installation time of the electrode, to improve the accuracy of the set gap while improving the quality of welding.

The proposed method is designed to restore a worn-out sections of the wheel zemsnarjada surface of complex shape. However, it is universal and can be used to recover a wide range of parts with complex, hard-to-surface wear.

Example.

Restoration wheel dredger. The wheel is made by casting from steel GL. Wheel diameter D=1050 mm, the thickness of the blades of the new wheels 30 mm

Within 120 hours of operation were worn areas on the sides and on the three blades of the wheel. The amount of wear was approximately 10-15 mm

When restoring the wheel dredger was fixed on the axis and fixed in the frame, which is fixed on the base can be rotated and fixed with horizontal and vertical location of its axis.

When restoring sections of the side surface of the cavity (cheeks) and his wheels were fixed with the vertical axis.

Facing the side of the wheel performed straight electrodes, made of Art. 3 PS, width 15 mm, thickness 3 mm, Gap between the surface of the welding electrode exhibited an elastic split ring made of paper twine. The hardness of deposited metal 50-53 HRC.

The length of the electrode was chosen according to the maximum length of the strip welding area, which is equal to 500 mm, the Welding on proceratium electrodes alternately along the strips of each of the sites with the formation of the arc and welding, resulting in the restored plot completely filled surfaced rollers.

When overlaying the blade wheel secured to the horizontal position of its axis. After overlaying another vane wheel turned about the axis to restore the following blades. The surfacing on the blade was carried out with the arrangement of the electrode along the axis of wheel electrodes having a bending angle equal to 60-75oto access the site welding. When the welding electrodes are alternately disposed on the blades and filling them surfaced rollers.

Current welding 450-500 And voltage 30-40 In the Welding was performed under a layer of flux an-34 8A. The electrodes were put in as a filler material mixture of iron powder PIV with high-alloyed powder. The total area of the surface of the cladding was 4500-5000 cm2.

CJSC "ORTHOGERMANATE", Novy Urengoy, Tyumen region were tested wheel dredger, restored welding recumbent electrode. During the trials, good results have been obtained. Life after welding reinforcing filling dim increased 2-3 times compared to the service life of the new wheels.

Technical and economic effect is to create a simple str is a simultaneous decrease maintenance costs and increase operating life.

Claims

The method of restoring worn parts, in which the part is fixed, having a horizontally worn areas, establish recumbent electrode with a gap over the worn area with the formation of an electric arc and carry out the welding, characterized in that the gap between the electrode and the surface deposition exhibit put on by the split electrode rings of insulating material with a low resistance, and when restoring wheel dredger with worn sites located in different planes, a wheel fixed on the axle, which have horizontally and vertically by surfacing the blade and on the sides of the cavity wheel, and turn the wheel about the axis for welding, consequently, blades and separated by the blade sections of the sides of the cavity, with the surfacing of each blade perform electrodes, bent at an angle less 90opositioning them on each blade along the axis of the wheel, and the cladding of each of the sections of the cavity wheel perform straight electrodes, which are sequentially injected into the cavity and have over the next surfaced strip of land, whichever is smaller lengths.

 

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FIELD: processes for surfacing with use of lying electrode, possibly restoration of worn surfaces of parts in different industry branches.

SUBSTANCE: method for surfacing bead of rollers of road building machines comprises steps of arranging roller in such a way that its axis is vertical; dividing surfaced zone of bead by technological sectors; forming electrodes of n mutually joined rods bent along arcs of sectors and arranging them on surfaced area of respective sector with gap; supplying flux and additive powder material to surfaced zone; connecting electrode and part with power source for exciting electric arc and performing surfacing; placing electrodes on sectors of bead simultaneously along the whole circle; electrically connecting front end of one electrode with bead; at surfacing narrow beads, forming electrodes of n mutually joined rods arranged one over another.

EFFECT: enlarged manufacturing possibilities of method for surfacing parts with annular worn surface, lowered cost, enhanced efficiency of process.

3 cl, 5 dwg, 1 ex

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