RU2424268C2 - Adhesive for metal articles - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: adhesive contains anaerobic sealant AH-112 in amount of 87-88 wt %, aluminium powder in amount of 11-12 wt % and bronze powder in amount of 0.3-0.4 wt %.

EFFECT: use of said components in the adhesive lowers the price of the adhesive, improves deformation-strength properties of the adhesive joint and increases durability of the adhesive joint.

2 tbl, 3 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of mechanical engineering and repair of equipment, in particular to the bonding of metal products in machine nodes.

State of the art

Known adhesive for metal products - anaerobic sealant AN-112. The disadvantages of glue include:

1) relatively high price;

2) relatively low deformation-strength properties;

3) the relatively low durability of adhesive joints under cyclic loading.

Disclosure of invention

Declared glue for metal products in machine components, including an anaerobic sealant AN-112, characterized in that it additionally contains aluminum powder and bronze powder in the following ratio of ingredients (in% by weight):

- anaerobic sealant AN-112 - 87 ... 88;

- aluminum powder - 11 ... 12;

- bronze powder - 0.3 ... 0.4.

Anaerobic sealants are multicomponent liquid compositions that can be stored for a long time without changing properties and quickly cure in the absence of interaction with oxygen. The basis of anaerobic sealants are polymerization-capable compounds of the acrylic series, most often dimethacrylic esters of polyalkylene glycols, which are characterized by a high rate of conversion to three-crosslinked polymers. Anaerobic sealants also include inhibitory and initiating systems providing long-term storage of sealants and fast curing in products, various thickeners, modifiers, dyes, and other additives [1].

The difference between the AN-112 anaerobic sealant and other Anaterm anaerobic sealants is that, to increase the elasticity of the polymer networks of anaerobic sealants, oligomeric rubbers with terminal urethane acrylate groups, which are the products of the interaction of hydroxyl-containing polyesters and oligomeric rubbers with diisocyanates and acryl, were synthesized. The introduction of reactive oligomeric rubbers into the composition of AN-112 sealant made it possible to significantly increase their strength and maintain thermal and chemical resistance [2].

Aluminum powder (GOST 5495-95) is made by abrasion of primary aluminum of a grade no lower than A5 according to GOST 11069 or its wastes that are not inferior in chemical composition to aluminum of grade A5. Get powder of five grades: PAP-1, PAP-2, PAG-1, PAG-2, PAG-3 (table 1).

In the manufacture of bronze powder, the initial raw materials are brands of bronzes that are close in composition to the resulting product, or specially prepared alloys. The production of powder includes the milling of alloy billets, grinding of grains in a ball mill, polishing of particles in a rotating drum. The particle shape of the resulting powders is petal-shaped. The composition of the powders,%: 72-92 Сu, 1.2 Al, <1.0 Fe, impurities no more than 0.8, zinc - the rest (table 2).

Table 2 - Characteristics of bronze powder [3] Mark Mass fraction of components *,% Residue on a sieve with a mesh, no more Area of coverage, cm ² / g, not less Bulk mass after shaking, g / cm ² Cu Fe, not less 0063 005 BPP-1 83-87 0.8 2.0 - 1200 1.8-2.6 BPP-2 83-87 1,0 - 0.5 - - BPP-3 72-76 0.8 2.0 - 1200 1.8-2.2 BPP-4 88-92 0.8 2.0 - 1200 1.8-2.2 * Up to 1.2% Al; the rest is zinc; fat content not more than 0.5%

An essential distinguishing feature of the prototype is that the adhesive additionally contains aluminum powder and bronze powder as fillers.

Thus, the claimed technical solution has significant distinguishing features from the prototype and thereby meets the criteria of the invention.

The price of the AN-112 anaerobic sealant (TU 2257-274-00208947-96) is 7920 rubles / kg, of the BPP bronze powder (TU 48-21-150-72) is 650 rubles / kg and of PAP-1 aluminum powder (GOST 5494-95) - 100 rubles / kg. Accordingly, the price of the claimed glue is 6911 rubles / kg, which is 1009 rubles. or 13% less than the prototype price.

Experimental studies have shown that the strength of the adhesive joints made by the inventive adhesive, with a thickness of the adhesive joint 0.05 mm was 20.5 MPa. This is 62.9% higher than the strength of adhesive joints made with a prototype adhesive (12.58 MPa). The deformation of the compounds made by the inventive adhesive was 24%, and the prototype 20%. The increase in the deformation-strength properties of adhesive joints made by the inventive adhesive, compared with the prototype increases the resistance to shock and cyclic loads and, accordingly, their durability.

The durability of the adhesive joints made by the inventive adhesive was 6.66, and the prototype 5.04 million loading cycles. Durability of adhesive joints increased by 32%.

The implementation of the distinctive essential features of the prototype, namely the introduction of additional aluminum powder and bronze powder into the AN-112 anaerobic sealant, allows to obtain a technical result, which is expressed in: 1) reducing the price of glue; 2) increasing the deformation-strength properties of adhesive joints made by the inventive adhesive; 3) increasing the durability of the adhesive joints made by the inventive adhesive.

Brief Description of the Drawings

Figure 1. Sample shafts for adhesive joints with bearing 207.

Figure 2. Centering device for assembling adhesive parts.

Figure 3. A bench for studying the durability of adhesive bearing joints under cyclic loading.

The implementation of the invention

Declared glue for metal products in machine components, including an anaerobic sealant AN-112, characterized in that it additionally contains aluminum powder and bronze powder in the following ratio of ingredients (in% by weight):

- anaerobic sealant AN-112 - 87 ... 88;

- aluminum powder - 11 ... 12;

- BPP bronze powder - 0.3 ... 0.4.

Anaerobic sealant AN-112, TU 2257-274-00208947-96 is supplied in 50, 100, and 200 capacity plastic bottles. Developer: Polymer Research Institute named after Kargina (Dzerzhinsk).

Aluminum powder PAP-1, GOST 5494-95, is commercially available. BPP bronze powder, TU 48-21-150-72, is widely available. It is delivered in plastic bags in quantities of 10 and 50 g.

The ingredients were weighed on a VLA-200 M analytical balance. Initially, the selected AN-112 sealant was poured into a glass container, then aluminum powder and bronze powder were added, after which the composition was thoroughly mixed. The composition was used for 10 minutes.

The samples were adhesive joints of the inner rings of bearings 207 with shafts. The shafts were made of steel 45 (Fig. 1). The roughness of the landing surface R _a 0.63 [4]. The diametrical clearance in the joint prior to gluing was ensured by grinding the shafts. To ensure the alignment of the parts of the adhesive joints used specially designed and manufactured centering devices (figure 2). Strength studies were performed on a tensile testing machine ИР 5047-50 with simultaneous recording of the load-deformation diagram. The loading speed during the tests was constant and amounted to 5 mm / min.

Durability tests were carried out on a specially designed and manufactured bench based on the IV-107A electromechanical vibrator (Fig. 3), which provides cyclic loading of the adhesive joints of bearings 207. The vibrator is an asynchronous squirrel-cage motor. At the ends of the rotor shaft, unbalances are established that are a source of disturbing vibrations. The vibrator is mounted on two metal plates measuring 500 × 500 × 25 mm and weighing 50 kg each. The plates are mounted on a metal base with dimensions 500 × 500 × 10 by means of four coil springs. A radial load of 20 kN on bearings 207 was created by unbalances [5].

The rotor speed was 3000 min ^-1 . The number of loading cycles was fixed using a counter connected to the stand shaft. Landing holes in the bearing shields of the vibrator were bored and specially made rings from the midrange were pressed into them (GOST 1412-80). The gap in the adhesive joint before bonding was provided by boring the seating surface of the cast-iron ring. Glue was applied to the outer ring of the bearing 209 and the seating surface of the cast iron ring. The operating time before the start of the shift of the outer bearing ring in the shield bore hole was taken as a criterion of durability, which was recorded by the displacement of the marks marked on the ends of the parts of the fixed connection.

Bibliographic data

1. Materials produced by FSUE "Research Institute of Polymers". // Glues. Sealants. Technologies. - No. 1. - 2006. - P.47-48.

2. Khamidulova Z.S., Rogacheva I.P., Aronovich D.A. and others. New anaerobic sealants for the automotive industry. / Khamidulova Z.S., Rogacheva I.P., Aronovich D.A. et al. // Plastics. - No. 6. - 1999. - p. 40.

3. Metal powders and powder materials: a guide. / B.N. Babich, E.V. Vershinina, V.A. Glebov et al. / Ed. Yu.V. Levinsky. - M .: ECOMET, 2005 .-- 520 p.

4. Spitsyn N.A. Rolling bearings [Text]: Reference book. / Spitsyn N.A., Sprishchevsky A.I .; - M.: Mashgiz, 1961, - 828 s.

5. Shchetinin M.V. The restoration of the fixed joints of rolling bearings of agricultural machinery with an adhesive Anaterm-105 [Text]: dis. ... cand. tech. sciences. / Shchetinin M.V. - Michurinsk, 2008, - 146 p.

Claims (1)

Glue for metal products, including an anaerobic sealant AN-112, characterized in that it additionally contains aluminum powder and bronze powder in the following ratio of ingredients, wt.%:
anaerobic sealant AN-112 87 ... 88
aluminum powder 11 ... 12
bronze powder 0.3 ... 0.4

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