The strength of the front axle of tractors used in rough terrain is crucial in countries in which agriculture is widespread. Thus, it is important to analyze the stress experienced by the front axle, as it eventually leads to cracks and premature failure. This study aims to solve the stresses that occur on the housing of the front axle. The results of a finite element analysis and strain gauge measurements were compared, and a correlation was found with 98 % accuracy.

In order to enhance the accuracy of predicting grinding forces during the surface grinding of knife-like tool blades, a novel analytical-regression correction method has been introduced. This method analyzes the changing contact line between the grinding wheel and the tool and refines the variable edge-width grinding force model through the use of exponential coefficients in a regression analysis. This significantly improves the predictive accuracy of the model.

Surface topography is an important feature to evaluate the surface quality of components, as is the stress concentration caused by the random surface topography. This paper proposes a numerical analysis method to study surface stress concentration factor (SCF) and relative stress gradient (RSG) for notched round-bar specimens. The surface SCF and RSG increased with increasing surface roughness, and a linear function relationship of surface roughness with surface SCF and RSG was established.

In this paper, the traditional bee colony algorithm is improved, and its roundness error evaluation method is improved. For the roundness profile data of the part, the improved bee colony algorithm is used to determine the position and size of the circle. In order to improve the efficiency of the algorithm, the local search region of the population initialization is determined according to the definition of roundness error. The evaluation accuracy of this algorithm is better than common ones.

A novel parallel leaf-spring carrying mechanism was designed and studied for high-precision fast wafer positioning and transfer in lithography. Displacement was used to calculate the equilibrium attitude, and the laser triangulation coordinate method was used for attitude measurement. The effectiveness of the attitude model was shown by numerical analysis and experimental verification. The methods can be used as a reference for the analysis and design of a complex parallel compliant mechanism.