A Novel Optimization Design Method of Form Grinding Wheel for Screw Rotor

Abstract

The profile accuracy of screw rotors plays a vital role in stabilizing the meshing operation between mated rotors. Such stability can minimize the vibration and noise, as well as improve the sealing performance and wear resistance. This is the main reason why form grinding is extensively applied as a finishing process to maintain high screw rotor profile accuracy. Since the installation parameters for form grinding wheels affect both the grinding wheel profile accuracy and grinding performance, it is essential to obtain reasonable installation parameters to guarantee the high precision and good grinding performance of form grinding wheels. In this paper, a novel optimization design method for form grinding wheels for screw rotors has been proposed. For the first time, the relationship between the grinding wheel installation parameters and profile accuracy is established to evaluate the grinding performance. A parameterized program has been designed based on space engagement theory. The characteristics of the contact line and profile features of form grinding wheels under different installation parameters have been investigated. Then, the proposed method was employed to select the correct range of installation parameters. To validate the proposed method, a set of experiments, including the manufacture and measurement of several screw rotors, was carried out. The results reveal that the precision of the screw profile is significantly improved compared with the empirical method, thus showing the effectiveness of the proposed method.

Optimization and characteristic analysis of screw rotor of a twin-screw pump

“…Scholars at home and abroad have carried out research work on the profile, flow field simulation and vibration of twin-screw pump, among which Zhihuang Shen et al [1] study the efficient and high-precision design method of double-screw rotor profiles through a pixel solution-based design method, obtain each spacer scan surface to capture the data point set of sub-compartments, and convert the data point set to the same coordinate system to produce conjugated rotor profiles. Zongmin Liu et al [2] by establishing the relationship between the grinding wheel mounting parameters and the contour accuracy, and studying the characteristics of the contact lines and contour characteristics of the grinding wheels under different installation parameters, the accuracy of the screw line is significantly improved compared with the empirical method, and proves the effectiveness of the proposed method. Jun Wang et al [3][4] by constructing the eccentric expansion screw rotor (EIR) and studying the problem caused by the sharp or nonsmooth point of the external cycloidal surface, a completely smooth design surface is obtained.…”

On-Machine Precision Form Truing and In-Situ Measurement of Resin-Bonded Spherical Diamond Wheel

“…On-machine precision form truing is primarily aimed to eliminate the errors caused by installation, manufacturing, wear, and other factors of the grinding wheel [7]. The error elimination could improve the rotation and profile accuracy of the grinding wheels, which is crucial for obtaining good surface accuracy and quality [8,9].…”