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.

Form Grinding Simulation and Tool Abrasion Estimation for Twin Screw Compressor Rotors Based on Solidworks API

2012 ◽  
Vol 579 ◽  
pp. 174-183
Author(s):  
Yu Ren Wu
Keyword(s):  
Application Programming Interface ◽  
Grinding Wheel ◽  
Screw Compressor ◽  
Form Grinding ◽  
Solidworks Api ◽  
Twin Screw ◽  
Application Programming ◽  
The Mathematical Model ◽  
Grinding Simulation ◽  
Rotor Model

This paper presents a form grinding simulation of twin-screw compressor rotors with high precision. The simulation interface has been developed using VB.NET programming language based on SWAPI (SolidWorks Application Programming Interface), and the mathematical model of rotor form grinding has been established for generating the tool-feeding path. Based on the proposed procedure, the machined rotor model can be rapidly obtained with the required precision. Furthermore, the grinding area and tool abrasion on the grinding wheel can be both estimated and displayed through the use of existing SW tools for longevity assessment.

Dynamic Analysis for Rotors of a Twin-Screw Compressor with Gas-Induced Cyclic Loads

2015 ◽  
Vol 789-790 ◽  
pp. 220-225
Author(s):  
Yu Ren Wu ◽  
Van The Tran ◽  
Po Hua Hsu
Keyword(s):  
Multibody Dynamics ◽  
Noise Spectrum ◽  
Dynamics Simulation ◽  
Screw Compressor ◽  
Cyclic Loads ◽  
Frequency Domains ◽  
Dynamic Forces ◽  
New Strategy ◽  
Twin Screw ◽  
Screw Rotors

The effects of dynamic forces and elastic contacts in a pair of intermeshing rotors with the gas-induced cyclic loads based on the multibody dynamics simulation have not investigated yet. The comparison of numerical spectra of time and frequency domains of acceleration with the experimental noise spectrum of an oil-injected twin-screw compressor has not also considered. Therefore, this study proposes a new strategy, which combines the fluctuating torques and forces induced by cyclic gas pressure on the screw rotors to numerically predict vibration response in an oil-injected twin-screw compressor.

scholarly journals Research on Performance of Variable-Lead Rotor Twin Screw Compressor

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6970
Author(s):  
Huagen Wu ◽  
Jiankang Liu ◽  
Yuqi Shen ◽  
Mengtao Liang ◽  
Beiyu Zhang
Keyword(s):  
Volume Ratio ◽  
Screw Compressor ◽  
Core Component ◽  
The Core ◽  
Compressor Rotor ◽  
Twin Screw ◽  
Wrap Angle ◽  
Simulation Results ◽  
Internal Volume ◽  
Screw Rotors

Twin-screw compressors are widely used in aerodynamics, refrigeration and other fields. The screw rotors are the core component of the screw compressor and affect the performance of the compressor. This paper focuses on variable-lead rotors. A thermal process simulation model considering leakage is established to calculate the efficiency of the compressor. Different lead change methods are compared by evaluating the contact line, exhaust port and simulation results. The results show that the compressor obtains better performance when the lead decreases rapidly on the discharge side. Furthermore, the effects of the wrap angle and internal volume ratio on variable-lead rotors are studied. The work provides a reference for the design of the screw compressor rotor.

Solving the screw compressor rotor-forming grinding wheel using the edge detection method based on the graphic method

2019 ◽  
Vol 233 (5) ◽  
pp. 967-979 ◽  
Author(s):  
Jian Yang ◽  
Fang-Hong Sun ◽  
Zheng Lu
Keyword(s):  
Edge Detection ◽  
Detection Method ◽  
Grinding Wheel ◽  
Screw Compressor ◽  
Graphic Method ◽  
Grinding Wheels ◽  
Helical Surface ◽  
Compressor Rotor ◽  
Edge Detection Method ◽  
Screw Rotors

As a complex grinding wheel for special use, the screw compressor rotor-forming grinding wheel needs to be designed according to the specific profile of the workpiece. The design process is complicated and difficult to grasp, and various design issues are likely to occur. This study is based on the design theory of helical rotor-forming grinding wheels. Here, disc-shaped forming grinding wheels for machining a helical surface were studied, with discrete point workpiece cross-sections as examples. MATLAB was used as the development tool, and the Unigraphics motion simulation function was applied to establish a 3D model of screw rotors and design the forming grinding wheel for machining the helical surface. Additionally, the edge shape of the grinding wheel obtained with the analytical method and the edge shape obtained with the edge detection method based on the graphic method and the alpha-shape algorithm were compared. The results of this comparison show that the edge shape of the grinding wheel obtained by the edge detection method had high precision and was easy to solve. This method can also be used for the design of other similar conjugated products such as gears, worms, and grinding wheels. The research findings provide important reference value for the design and machining of screw rotors and grinding wheels.

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.

Rotor Profile Generation Method for Twin Screw Compressors Based on Bi-Direction

2012 ◽  
Vol 229-231 ◽  
pp. 465-469
Author(s):  
Xue Ming He ◽  
Ming Han ◽  
Yang Deng ◽  
Yi Lu ◽  
Chen Liang Hua
Keyword(s):  
New Method ◽  
Reverse Direction ◽  
Screw Compressor ◽  
Key Technology ◽  
Rotor Profile ◽  
Twin Screw ◽  
Rotor Profiles

The performance of twin-screw compressor is mainly decided by profiles of the two rotors. The constitution of new rotor profiles is studied, meanwhile the key technology of generating rotor profiles are mainly studied in this paper. A new method based on forward and reverse direction for generating rotor profiles with meshing lines is proposed.

Analysing by Simulation to Evaluate the Method of Measuring Screw Rotors with CMM

2010 ◽  
Vol 36 ◽  
pp. 63-67
Author(s):  
Qian Cheng Zhao ◽  
Chang You Lu ◽  
Qiao Xu ◽  
Geng Huang
Keyword(s):  
Screw Compressor ◽  
Geometrical Parameters ◽  
Helical Surface ◽  
Key Technology ◽  
Sampling Density ◽  
Simulation Process ◽  
Probe Radius ◽  
Section Profile ◽  
Screw Rotor ◽  
Screw Rotors

The important parts of a screw compressor are the two rotors. At present, generally use a CMM to check the form and other parameters of the rotors to ensure its function. Among the all geometrical parameters of a rotor, the form of traverse section profile is the most important one. In the process of measurement, the key technology problem is the probe radius correction because of the complexity of 3D helical surface. When the nominal values of the rotors are unknown, the radius correction is more difficult than that is known. This paper presents a method to evaluate the precision of measuring screw rotors by simulation. Suppose a referenced helical surface, first select the probe ball radius and sampling density, calculate the coordinate values of the probe ball centers along a fixed plane, then calculate the values of measured contour by radius correction, finally compare the reconstructed contour with the referenced surface to evaluate the selected measuring parameters such as probe ball radius, sampling density, the algorithm of radius correction and so on. This simulation process is necessary for actually measuring a screw rotor.

Integral Modeling of a Twin-Screw Compressor

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Sarah Van Erdeweghe ◽  
Joris De Schutter ◽  
Eric Van den Bulck
Keyword(s):  
Working Conditions ◽  
Control Volume ◽  
Optimization Procedure ◽  
Future Research ◽  
Screw Compressor ◽  
Positive Displacement ◽  
Rotor Profile ◽  
Twin Screw ◽  
Large Application ◽  
Similarity Law

In this paper, an integral methodology for the modeling of a twin-screw compressor is presented. Starting from a known rotor profile, all the algorithms to calculate the second rotor profile, the size of the control volume, and the compressor's performance are presented. The proposed modeling approach can be applied in an optimization procedure to find the optimal rotor profiles for a given application, with corresponding working conditions. Furthermore, based on the modeling results and substantiated with measurements on different compressor types, a similarity law for positive displacement compressors seems to exist. The existence of a similarity law has large application potential as it could be used to predict the performance of a positive displacement compressor in other than the (lab) tested working conditions. Further investigation of the similarity law for positive displacement compressors is therefore proposed as a key topic for future research.

scholarly journals The analysis of best-seller fantasy novel covers in 2019 through multimodal lens

2021 ◽  
Vol 12 (1) ◽  
pp. 1-18
Author(s):  
Arinal Haqqiyah Ahmad ◽  
Bukhari Daud ◽  
Dohra Fitrisia
Keyword(s):  
Qualitative Research ◽  
Content Analysis ◽  
Research Method ◽  
Research Data ◽  
The Novel ◽  
Relevant Research ◽  
Study Activity ◽  
Fantasy Novels ◽  
Data Content ◽  
Representative Function

The purpose of this research was to analyze ten covers of 2019 best-seller fantasy novels through multimodal. The research method used was qualitative research. The objects in this research were ten book covers of 2019 best-seller fantasy novels. The instruments used were documentation that aimed at obtaining data, including relevant books, study, activity reporting, relevant research data. Content analysis was used to obtain the data. This study used five phased cycles in analyzing the data; compiling, disassembling, reassembling, interpreting, and concluding. The result of analyzing the novels is emphasized in two focuses, including representation and interactive function. Several novels have a narrative aspect, while others contain conceptual interpretation, which is part of a representative function. It was very challenging to interpret some implicit meaning of the symbols in some of the novels as it requires mythical knowledge. Therefore, it is expected that understanding the implicit meaning comprehensively will make readers easier to understand the story outline of the novel.

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