A pre-compensation method for profile errors of screw rotors under precision form grinding

2021 ◽  
Author(s):  
Lijia Tao ◽  
Mingxin Yuan ◽  
Haifeng Fang
Keyword(s):  
Compensation Method ◽  
Form Grinding ◽  
Profile Errors ◽  
Screw Rotors

Key Technology of Form Grinding Wheel’s Axis Section’s Derivation

2013 ◽  
Vol 753-755 ◽  
pp. 1557-1561
Author(s):  
Ling Zhang ◽  
Bin Yao ◽  
Zhi Huang Shen ◽  
Wen Chang Zhao ◽  
Bin Zhou
Keyword(s):  
Research Method ◽  
Screw Compressor ◽  
Grinding Wheels ◽  
Relevant Research ◽  
Key Technology ◽  
Form Grinding ◽  
Key Technologies ◽  
Twin Screw ◽  
Screw Rotors ◽  
The Mathematical Model

Upon researching on the form grinding principle of rotor of the twin-screw compressor, firstly, this article gives the mathematical model of acquiring form grinding wheels axis section from screw rotors end section which is given by a series of discrete points. Then some key technologies to solve problems during the derivation of grinding wheels axis section and relevant research method to optimize the best setting angle have been analyzed. And last, the results of simulation and actual processing prove that this method is reliable and can meet the requirements of machining precision.

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

2019 ◽  
Vol 9 (23) ◽  
pp. 5079 ◽  
Author(s):  
Zongmin Liu ◽  
Qian Tang ◽  
Ning Liu ◽  
Pinghua Liang ◽  
Wei Liu
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Empirical Method ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Grinding Performance ◽  
Form Grinding ◽  
Screw Rotor ◽  
Screw Rotors ◽  
Profile Accuracy

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.

Mathematical Modeling for Screw Rotor Form Grinding on Vertical Multi-Axis Computerized Numerical Control Form Grinder

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Yu-Ren Wu ◽  
Chung-Wen Fan
Keyword(s):  
Numerical Control ◽  
Grinding Wheel ◽  
Noise Current ◽  
Form Grinding ◽  
Tooth Modification ◽  
Screw Rotor ◽  
Computerized Numerical Control ◽  
Rotor Tooth ◽  
Five Axis ◽  
Screw Rotors

The pair of screw rotors is a key element of a twin-screw compressor, and rotor tooth modification has gradually received attention because it can reduce operating compressor noise. Current rotor machining references are mainly related to forming tool design or abrasion of the “horizontal” grinder, but little attention has been paid to form grinding using a “vertical” grinder and simulating the machining flexibility of each grinder axis. Therefore, this paper established a general coordinate system for the screw rotor form grinding and connected it to a vertical five-axis computerized numerical control form grinder to simulate rotor grinding and tooth modification. Further, the influence of a form grinding wheel contour designed by different declination angles of a rotor tooth profile on a grinding rotor tooth and the influence of the motion parameter of each axis on the machining precision of the rotor and the tooth shape are proposed in this paper.

Form Grinding of Precision Helical Rotors and Gears Using Closed-Loop Profile Control

2007 ◽  
Author(s):  
C. S. Holmes
Keyword(s):  
Closed Loop ◽  
Screw Compressor ◽  
Spur Gears ◽  
Form Grinding ◽  
Profile Control ◽  
Worm Gears ◽  
Loop Feedback ◽  
Closed Loop Feedback ◽  
Profile Errors ◽  
New System

Starting with a description of a system for precision profile grinding of screw compressor rotors using closed-loop feedback for correction of profile errors, the paper goes on to describe a new system for the form grinding of precision spur, helical, and worm gears. This paper describes the development of high precision helical form grinding systems. The system was originally developed to satisfy the demanding accuracy requirements of screw compressor rotors, which will be understood from a description of their function. The system was then developed for the grinding of helical and spur gears to Quality 2/3 of DIN 3962. The paper describes both systems, with reasons for the design choices, and the results obtained. It is intended to be of interest to designers and manufacturers of rotors and gears.

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