Method of Calculation of Infrared Treatment Units of Polymer Coatings During Body Recovery Components of Automotive Equipment

Abstract

Application of polymer coatings for restoration of worn-out bearing holes in housing parts of automotive equipment provides multiple increase of their service life, reduction of repair costs, improvement of reliability. The highest efficiency is achieved by applying elastomeric coatings. To cure the material and achieve high mechanical properties, the coating, after application, is subjected to thermal treatment by convective or thermoradiation methods. Coatings after treatment by a thermoradiation method, in comparison with convective, have significantly lower porosity and higher quality. A model of infrared heating of type I body parts (gearbox housing, car and tractor transfer case housing) has been developed, which takes into account the heat capacity of the material and the design parameters of the part, the ambient temperature and the steady temperature of the part during heating, the design parameters of the infrared radiation installation. The model allows you to calculate the rate of temperature increase and the time of heating the part to the required temperature by infrared heating. The article describes in detail the algorithm and provides a computer program for calculating the structural and technological parameters of the infrared processing plant for elastomeric coatings applied during the restoration of bearing holes in the body parts of the equipment. Heating of the gearbox housings of GAZ-24 and GAZ-53A cars showed a high coincidence of the design and experimental values of infrared heating parameters. The difference between the actual heating temperature of the body part and the design temperature is from 1.5 to 2.4%, the heating time is from 6.1 to 8.2%, which is a confirmation of the correctness of the developed method for calculating the structural and technological parameters of infrared installations. An experimental assessment of the quality of elastomeric coatings after heat treatment by various methods was carried out. Compared to the convective method, after infrared treatment, the quality of elastomer coatings increased F-40S: the area of the destroyed coating decreased by 1.33 times, the concentration of pores in the coating - by 1.24 times.