RU2306214C2 - Method of repairing casing parts - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: method comprises applying metallic patch on the crack from above and securing it to the casing part. The thickness of the patch is 2-4 m, and the patch overlaps the crack over 20-40 mm. The holes are drilled throughout the area of the metallic patch at a distance of 4-6 mm one from the other and 2 mm from the edge. The through holes of a diameter of 3 mm are drilled in the wall of the casing part.

EFFECT: enhanced reliability.

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Description

The invention relates to methods for repairing body parts and can be used at repair facilities when restoring, for example, blocks and cylinder heads, clutch block crankcases, gearboxes, transfer cases, etc.

There is a method of repairing blocks and cylinder heads, which consists in washing, drying, cleaning the surface of the areas around the cracks, welding the ends of the cracks with annealing rollers, surfacing the preparatory rollers, cooling the part at the welding site to ambient temperature, welding the preparatory rollers with a connecting seam in short sections or scattering to complete welding of cracks | 1 |.

The disadvantages of this method are the significant complexity and low quality of repair work due to the complexity of the work (requires a highly qualified specialist) and ensuring the wear resistance and tightness of the restored part.

A known method of repairing body parts by servicing a repaired part, applying a sealant comprising a resin based on substituted phenol of vinylacetylene structure modified with butadiene rubber with subsequent curing of the sealant [2].

The known method does not provide a sufficient quality of repair, since the applied composition, under the influence of temperature and vibration on the loads, cracks and loses its sealing ability.

The closest in technical essence and the achieved result to the proposed method is a method of repair of body parts, which consists in installing and attaching metal patches over the entire area of damage to the part [3].

The disadvantages of this method are the significant complexity and high cost of the equipment used, the low quality of repair work due to the complexity of their implementation (a highly qualified specialist is required), and also in the proposed method, the main disadvantage is the poor weldability of traditional materials of aluminum alloy blocks (silumins) and cast irons. In addition, when repairing cracks by welding, treatment of base surfaces is often required.

The technical result is aimed at increasing the strength and resistance of the sealing compound to large temperature extremes and mechanical loads (detonation), as well as reducing the impact on the metal structure of the restored part.

The technical result is achieved by the fact that in the method of repairing machine parts of machines, including installing damage from above in the form of a crack of a metal patch and fixing it to the body part, a metal patch of 2-4 mm thickness is used, covering the damage area by 20-40 mm, after installing the metal patches are drilled over its entire area at a distance of 4-6 mm from one another and 2 mm from its edge through holes with a diameter of 3 mm with access to the body part to a depth of 0.2-0.4 of its thickness, and the attachment is made of metal the armor plates are carried out by cold gas-dynamic spraying of the powder into the aforementioned holes to a level corresponding to the thickness of the patch, and along the perimeter of the metal patch in the place of contact with the body part.

A distinctive feature of the prototype is that it uses a metal patch 2-4 mm thick, covering the damage area by 20-40 mm, after installing the metal patch, they drill through its entire area at a distance of 4-6 mm from one another and 2 mm from its edge through holes with a diameter of 3 mm with access to the body part to a depth of 0.2-0.4 of its thickness, and the attachment of a metal patch is carried out by cold gas-dynamic spraying of the powder into the said holes to a level corresponding to the thickness of the sewn, and around the perimeter m metal patch at the point of contact with the body part.

Figure 1 shows a part with a damaged section of the wall; figure 2 - patch with holes drilled in it; figure 3 - detail with an attached patch (section aa).

The method is implemented as follows.

The defect in the form of cracks 1 is cut in a known manner; holes 2 are drilled at the ends of cracks 1 with a diameter of 3 mm and these holes 2 are filled with metal powder by the method of cold gas-dynamic spraying. Then, grinding is carried out by grinding with sandpaper the surface 3 of the part to be repaired at a distance of 40-50 mm on both sides of the crack 1.

A metal patch 4 is cut out in a predetermined shape so that it overlaps the crack 1 by 20-40 mm around the entire perimeter, and 2-4 mm thick.

In patch 4, through holes 2 are drilled with a diameter of 3 mm at a distance of 4-6 mm from each other and 2 mm from the edge over the entire area of the patch 4, with an exit to the depth of the wall 5 of the body part by 0.2-0.4 of its thickness, after whereby the holes 2 are filled with metal powder by the method of “cold” gas-dynamic spraying according to the level of thickness of the patch 4, as well as along its perimeter at the point of contact with the part.

Powder material A-20-11 (DIMET equipment, mod. 403), designed to form a sealing compound, contains aluminum powder with a particle size of 1-50 μm, zinc powder with a particle size of 1-100 μm and silicon carbide powder with a size particles 1-63 microns.

After fixing the plates on the surface of the part, the restored place is ground and painted.

After fixing the patch, the body was tested on the sides of the cooling cavity with a hydraulic pressure of 0.7 MPa and color defectoscopy of sections of the body adjacent to the spray coating area was performed. Water permeability and the presence of cracks were not detected. In operation on the repaired case, defects are not observed.

The part is ready for use immediately after the painted surface dries.

Thus, the proposed method provides high quality repairs, an increase in the strength and resistance of the sealing compound to large temperature extremes and mechanical stress (detonation), as well as a decrease in the effect on the metal structure of the restored part.

List of sources used

1. Album of technological maps for the repair of tractor parts MT3-5L and MT3-5M GOSNITI. - M., 1996, p. 9-20.

2. USSR author's certificate No. 1070147 A, IPC S09K 3/10: B23P 3/04, 1984 (prototype).

3. Copyright certificate of the USSR No. 1349919 A1, IPC V23P / 04, 28/00, 1987 (prototype).

4. Copyright certificate of the Russian Federation No. 2205897, IPC С23С 24/04, 2003.

Claims (1)

A method of repairing machine parts of machines, including installing damage from above in the form of a crack of a metal patch and attaching it to the body part, characterized in that they use a metal patch 2-4 mm thick that covers the damage area by 20-40 mm, after installing the metal patch, drill through its entire area at a distance of 4-6 mm from one another and 2 mm from its edge through holes with a diameter of 3 mm with access to the body part to a depth of 0.2-0.4 of its thickness, and the metal patch is attached cold m gas-dynamic spraying a powder into said hole to a level corresponding to the thickness of the patch and the perimeter of the metal patch in contact with the housing part.

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