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.
Highlights
Screw rotors are extensively used in positive displacement screw machines such as compressors, vacuum pumps, etc. [1]
Installation parameters are usually determined by the empirical approach, which may lead to a low profile accuracy and poor grinding performance of the form grinding wheel, which in turn will affect the precision of the screw rotor
The areasthat with profile errors ofdesign the screw rotor areas with a largerfor profile indicates thelarger proposed optimization method cancorresponded provide better to grinding performance slope and curvature of the grinding wheel. form grinding wheels used with screw rotors than is possible when using the empirical method
Summary
Screw rotors are extensively used in positive displacement screw machines such as compressors, vacuum pumps, etc. [1]. As the major functionality part of such machines, the profile accuracy is often the decisive factor of the machine’s performance. Low profile accuracy often downgrades the screw machine’s sealing performance, vulnerates the rotors to wear, and causes undesired noise and detrimental vibration. The installation parameters of the form grinding wheel can directly determine the accuracy of the grinding wheel profile; they have significant effects on the grinding performance of the form wheel grinding. It has become increasingly important to reasonably and scientifically select appropriate installation parameters and to be able to rapidly obtain wheel profiles with good grinding performance. Installation parameters are usually determined by the empirical approach, which may lead to a low profile accuracy and poor grinding performance of the form grinding wheel, which in turn will affect the precision of the screw rotor.
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