RU2515298C1 - Application of polyurethane coat - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to application of polyurethane coasts on wearing structural parts, particularly, locating and sealing rings used in pumps, dredges, oil and other pumps, etc. For this, polyurethane coat is applied on major-wear surfaces of single-component metal part using an adhesive as the binder. Proposed method comprises the steps that follow. Major-wear surfaces of single-component metal part are machined by removing the layer in magnitude corresponding the coat depth. Then, grooves are made on said all surfaces to be degreased. Said surface are processed with binder Silbond 49 SFS while the part is heated. Thus prepared part is placed in the mould. Clearances between the part and mould surfaces are filled with polyurethane "СКУ ПФЛ-100". Polyurethane is cured at 80-100°C for three hours for hardening, the part is cooled and withdrawn from the mould.

EFFECT: longer life.

3 cl

Description

The invention relates to the field of applying polyurethane coatings on structural parts most susceptible to wear, in particular on installation and sealing rings used in soil pumps for suction dredges or dredges, earth-moving machines for cleaning gutters and ponds, in oil and other pumps for liquid and current media , as well as for applying to other parts of mechanisms and machines.

The closest method of the same purpose to the claimed invention in terms of features is a method of manufacturing a hybrid metal-plastic structural parts, including a metal component, non-metallic component and a binder (see application for invention of the Russian Federation No. 2008147385/04, class CO8J 5/12, 31.05. 2007), adopted as a prototype.

The reasons that impede the achievement of the technical result indicated below when using the known method adopted as a prototype include the fact that in the known method the outer layer of a structural part made of plastic or metal is not able to protect the part from rapid wear under the influence of pumped liquid and fluid media, for example water with sand during the cleaning of the fairway and riverbeds, ponds and drains with earth-moving machinery.

The invention consists in the following.

The problem to which the invention is directed is to increase the wear resistance of structural parts.

The technical result is an increase in the service life of structural parts by increasing their wear resistance.

To achieve the specified technical result, the structural part after coating includes a metal component, a non-metallic component and a binder. To do this, a polyurethane coating is applied to the metal component, the role of which is wearing (s) surface (s), first of a one-component, for example, steel part, and an adhesive, for example, silbon, is used as a binder.

The method is carried out in the following sequence:

- carry out the machining of the wearing (s) surface (s) of a single-component part by removing the layer by an amount corresponding to the required coating thickness;

- grooves are applied to the entire processed surface (s), for example, in the form of counter left and right threads;

- degrease the above (s) surface (s), for example, with acetone;

- treating the surface (s) with a binder, for example, with a silicone bond;

- warm the part to a temperature of 60-80 ° C;

- cover the prepared (s) surface (s) by injection mold (s);

- in the gap (s) between the surfaces (s) of the part and the molds (s), polyurethane is poured;

- withstand it at a temperature of 80-100 ° C for three hours for curing;

- after cooling, the coated structural component (s), consisting of already three components: metal (e.g. steel), non-metal (polyurethane) and a binder (sylbond adhesive), are removed from the molds (- s).

The applied polyurethane coating will protect the metal structural part from wear, which will increase the life of the part.

Information confirming the possibility of carrying out the invention.

When applying a polyurethane coating to the wearing (s) surface (s), for example, structural parts in the form of rings, operations are performed in the following sequence:

- carry out the machining of the inner, outer and end surfaces, for example, the installation ring of the soil pump of the dredging projectile by removing a layer of about 10 mm to the side around the entire circumference of the steel part;

- grooves are applied to all treated surfaces, for example, in the form of counter left and right threads, in order to create a roughness for better retention of the coating;

- degrease the above surfaces, for example, with acetone;

- treat the surface with a binder, for example, adhesive with a bond of 49 SPS;

- heat the part to a temperature of about 80 ° C;

- cover prepared surfaces with casting molds: internal and external;

- polyurethane is poured into the gap between the surfaces of the part and molds, for example, SKU PFL-100;

- maintain the part for 3 hours at a temperature of 100 ° C for curing polyurethane;

- after cooling, the part, which already consists of three components: metal, non-metal and binder, is removed from the molds.

When implementing the method of applying a polyurethane coating using known means (devices and substances).

Another example of the use of the proposed method of applying a polyurethane coating on a metal part is a similar process, but is already used for the sealing ring of the soil pump of a dredging projectile in order to increase the tightness of the structure.

The claimed method is supposed to be applied in any field of human activity: industry, agriculture, military affairs, in pipeline transport, etc. for polyurethane coating of structural parts of machines and mechanisms not only for their longer operation, but also to increase resistance to shock loads, reduce noise and / or friction, good durability: erosive, atmospheric, chemical, anti-corrosion.

The use of the invention increases the wear resistance of structural parts of machines and mechanisms by applying a polyurethane coating on them, which leads to an increase in their service life. In addition, the parts acquire a number of positive mechanical and chemical properties.

The test showed that when using a one-component metal installation ring, the soil pump can wash 100 thousand tons of sand before changing the ring due to its complete wear. After coating the new ring, the soil pump has already pumped 400 thousand tons of sand, and until now the ring continues to operate. In addition, it was found that the polyurethane coating increased the duration of the operation of another mechanism: tumbling drum - by increasing its resistance to shock loads.

Claims (3)

1. The method of applying a polyurethane coating to a structural part, characterized in that the metal component, the role of which is wearing surfaces, a polyurethane coating is applied to the one-component part, and an adhesive is used as a binder, the method is carried out in the following sequence:
- carry out the machining of the wearing surfaces of a single-component part by removing the layer by an amount corresponding to the required coating thickness;
- grooves are applied to all treated surfaces;
- degrease the above surfaces;
- treat the surface with a binder Silbon 49 SPS;
- warm the part to a temperature of 60-80 ° C;
- cover prepared surfaces with injection molds;
- SKU PFL-100 polyurethane is poured into the gap between the surfaces of the part and the molds;
- withstand polyurethane at a temperature of 80-100 ° C for three hours for curing;
- after cooling, the structural part with a coating, consisting of three components: metal, non-metal and binder, is removed from the molds. 2. The method according to claim 1, characterized in that the grooves applied to the machined wear surfaces of the part are made in the form of counter left and right threads. 3. The method according to claim 1, characterized in that acetone is used to degrease the treated surfaces of the part.