Liu Ping China Railway + Office In recent years, China has gradually increased the construction of infrastructure, the construction industry market is increasingly prosperous, and in the construction of the main military theory is also increasingly taken seriously, because the rapid quality of maintenance is Guarantee of benefits. Because of its simple process, the bonding technology is widely used in the repair of construction machinery without requiring special equipment and high maintenance quality, and has received very good results.

Adhesion technology uses adhesives to connect two components together, and can also be used to repair damaged parts.

Therefore, the bonding technology and welding spray brush plating technology complement each other and become a promising process for the repair of construction machinery.

Adhesive process has many unique advantages. It does not need to consume energy pool in the process without special equipment, and the process is simple; the bonded product has no heat affected zone, no deformation, combined strength; and can obtain wear-resistant anti-corrosion insulation, etc. characteristic. Particularly suitable for parts that are difficult or impossible to weld thin-walled structures with complex shapes and eager to repair.

Due to the series of advantages of the bonding technology, it has received widespread attention in the field of construction machinery repair, especially at the construction site, providing more convenience for the repair of construction machinery, and this technology is advancing rapidly with each passing day.

The disadvantage of the bonding process is that the adhesive layer is susceptible to ageing and deterioration under conditions of prolonged contact with the air under hot and light conditions. In addition, the temperature performance of the adhesive is poor, and the working temperature of the organic adhesive is generally 200 or less.

2 Adhesive Technology Process Steps Adhesive processes include surface treatment, glue coating, curing, and other steps.

2.1 Surface treatment Surface treatment has a great influence on the bonding quality. It requires that the surface to be adhered is rust-free, free of oil and other impurities, and has a suitable finish. The surface treatment includes rough cleaning, mechanical processing, degreasing treatment, activation treatment, and cleaning.

2.2 Adhesives Adhesive materials usually consist of two parts.

According to different working conditions and uses, adhesives must be formulated in the prescribed proportion and order. For hot melt adhesives, it should also be heated to the appropriate temperature. The adhesive should be used immediately after mixing.

2.3 Coating Apply the prepared adhesive evenly to the surface of the bonded article. When smearing, there must be no leakage or partial over-application. The coating thickness is 0.050.

15 stomach is appropriate. For adhesive-coated parts, the bonding time should be different depending on the type of adhesive. Fast-drying adhesives should be bonded and cured as soon as possible. For non-rapid-curing adhesives, it is advisable to place the adhesive for a certain period of time after the solvent has been substantially volatilized.

2.4 Curing The curing after bonding needs to be carried out at a given pressure and temperature with certain time requirements. The curing must be carried out according to the requirements of various adhesives. Appropriately improve the curing 2.5 After the curing agent is completely cured, it should generally be processed and trimmed. Turning grinding can be used to achieve the desired size and accuracy.

The above is the process of bonding technology. Only by strictly following the prescribed procedures can we achieve higher bonding quality.

3.1 Repair of hydraulic cylinder pull marks In April of 1998, the hydraulic cylinders of the hydraulic cylinders of our company's units, loaders and their booms caused a large surface scratch on the inside due to a certain reason, which seriously affected the urgent need for repair in the project. According to conventional practice, it is necessary to ram the cylinder and replace the new piston and piston ring. This is a labor-intensive and long-term repair. At the time, the construction site conditions are not met, and some necessary mechanical processing equipment is not available. Finally, it was decided to use adhesive technology for repair.

We use Tiangong Ding 0 301 anti-friction agent produced by a company in Beijing to perform internal treatment on the hydraulic cylinder first, including initial cleaning deburring and roughening and final cleaning. The weight ratio of the friction reducing agent to the two components is six 4=51. Strict proportioning, full mixing immediately after coating, the coating is cured at room temperature, after 24 to reach a degree of use, and then with a high-speed abrasive wheel coarse grinding, and then polishing with a forming polishing machine, polishing, until the required accuracy. The use of good results, no abnormalities.

3.2 Repair of Oil Leakage of the Tank We use Beijing Tiangong's process to use a guillotine knife to cut the oil leak first. The groove is decontaminated with absorbent cotton wool, scrubbed with alcohol, and finally washed with acetone; after washing, it is parked for half a day and then used. The cotton ball wipes the oil leakage; fills the bottom of the groove with a repair agent. After curing 24, the rubber surface is light white and then lightly rubbed with cotton balls and acetone. Finally, the 704 silica gel produced by the Nanjing Chemical Industry Chemicals Factory is used for the entire process. Sealed, ready to use after 2 cents.

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