**1. Introduction**

The mobile jaw plate of a jaw crusher is under severe impact in humid and high temperature environments. In the world, there are approximately 200–300 thousand movable jaw plates damaged by wear every year, and the consumption of steel is approximately 60–72 thousand tons [1]. Each year, this directly causes a loss of more than one billion dollars [2]. Therefore, mining enterprises pay a huge price for it. In order to strengthen its wear resistance, the surface of the moveable jaw plate is usually treated by laser cladding and other methods [3]. Laser cladding technology is an advanced surface modification technology, which involves many disciplines, such as metal materials, metallurgy, chemistry, and so on. It is found that the tensile strength and hardness of the coating are always higher than that of the substrate, and the performance is better than that of the substrate [4–7], no matter how the laser power is set in a certain range. However, the analysis of the effect of friction heat on the wear resistance of laser cladding materials remains to be discussed. Therefore, the analysis of the wear behavior and material structure of the moving jaw plate after the symmetrical laser cladding path under the action of reciprocating impact and friction has a positive significance for the study of the influence of temperature on the wear resistance of the moving jaw plate and the surface modification of the moving jaw plate.

For the study of wear of the jaw crusher and other mining crushers after laser cladding, the existing research methods are mainly theoretical calculation, test, and other methods [8–10]. Karan et al. analyzed the main wear area of the acceleration plate of the vertical impact crusher, changed the structural parameters and production parameters of the rotor, respectively, and explored the wear characteristics of the acceleration plate [11]. Drzymała et al. analyzed the mechanical characteristics and particle movement characteristics of the hammer head of the vertical shaft impact crusher through theoretical calculation and determined that impact wear is the main form of hammer head wear [12]. Limanskiy et al. analyzed the movement of the jaw plate of the jaw crusher through experiments and analyzed the wear on the jaw plate of the jaw crusher based on the microwear mechanism and failure of the jaw plate surface, so as to learn the reason for jaw plate wear when materials are broken [13]. Amanov et al. analyzed the change trends of the grain area, and hardness and wear of the chain wheel of the mine conveyor after treatment at different temperatures and times and finally obtained the best treatment temperature and time [14]. Baek et al. analyzed the kinematic characteristics of the materials in the cone crusher through theoretical calculation, solved the crushing process, and obtained the compression ratio, particle size distribution coefficient, and crushing pressure in each region of the crushing chamber [15]. Abuhasel et al. calculated and analyzed the wear of the impact crusher plate hammer after different laser cladding processes and determined the spot diameter and powder spreading speed of laser cladding in the early stage with the minimum wear amount [16]. Anticoi et al. conducted an experimental analysis on the temperature field of the friction stir welding process on the roller surface of the roller crusher and found that the friction coefficient decreased with the increase of the temperature, and the welding temperature increased with the increase of the concave angle of the shoulder [17]. Pei et al. analyzed the influence of particle size on the liner wear of the semi-autogenous mill via a theoretical calculation method. The results showed that the wear of the lining plate is especially significant when the particle size increases, the wear of the lining plate increases with the increase of particle size, and the kinetic energy obtained by large particle materials is far greater than that of small particle materials [18].

The wear amount calculated by theory is quite different from the actual result, and most of the conditions calculated by theory are ideal. In the physical prototype, the wear performance test of the components of the crusher is carried out, and the analysis of the wear characteristics of the components has great data disturbance, so it is difficult to extract the relevant data accurately and collect the data. Therefore, in this study, a finite element model of the cylinder-ring was built in the finite element program generator (FEPG). The temperature of laser cladding ceramic powder (surface material of the movable jaw plate) obtained by FEPG under different loads was verified and compared with the temperature obtained by the test. At the same time, the stable temperature, wear amount, effective hardening layer thickness, strain thickness, and iron oxide content corresponding to different loads were analyzed. The research results can be used to solve the problems of failure of the jaw crusher caused by high friction temperature and low service life of the moving jaw plate under complex working conditions. At the same time, they can provide a theoretical basis for analyzing the wear performance of the moving jaw plate material after symmetrical laser cladding path and the temperature change of the moving jaw plate in friction, which is of great significance to the surface modification of the moving jaw plate.

In addition, through the existing literature, it is found that in the cylinder disk test, along the direction of sliding friction, plastic deformation occurs on the surface of cylinder coating, resulting in different thicknesses of the work hardening layer [19–21]. However, analysis of the effect of friction heat on the wear resistance of laser cladding materials is still lacking.
