Precision grinding of screw rotors using CNC method

Zhao, Yongqiang; Zhao, Shengdun; Wei, Weifeng; Hou, Hongling

doi:10.1007/s00170-016-9241-9

Cited by 28 publications

(10 citation statements)

References 13 publications

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“…To investigate the influence of grinding wheel installation on the rotor profile, a numerical method considering various installation errors (e.g., installation angle error, center distance error, and axial position error) was presented by Tao et al [12]. Using the computer numerical control (CNC) method, Zhao et al [13] investigated the precision grinding via an analysis of the major grinding parameters (e.g., center distance, swivel angle, and initial phase angle) and screw rotor profile. The authors managed to improve the screw rotor profile accuracy with a novel grinding wheel segmentation dressing method.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…set up a simulation model under different working conditions, namely under compression, slightly over compression, and over compression, and the result demonstrate the pressure change process inside the pump. 8 A screw grinding process based on computer numeric controlled machine tool was proposed by Zhao et al., 9 in which the screw rotor profile errors can be controlled within ±10 μm. A variable cross-section profile is put forward by Wang et al.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental analysis of end face profile of tri-screw pump

Dong

Zhao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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This study proposes a new type of tri-screw pump, which has a 1:2:3 ratio of the active diameter of the screw, the diameter of the pitch circle, and the top diameter of the active screw. Fixed width correction method of the driven screw is also proposed to avoid wear of tooth top. The mathematical model of active and driven screws is established. To avoid the wear of the tooth top arc, several transition patterns are proposed, and the transition curve in the form of a circular arc is deduced. The designed screw curve is grinded, and the tri-screw pump is assembled. The hydraulic pump test bench is tested using the overflow valve to perform pressure loading of 3–5 MPa on the outlet of the screw pump. The outlet flow rate and pressure are tested, and results indicate that the output flow of the pump conforms to the designed flow rate. This study establishes the detailed equation of the end face profile of the tri-screw pump (active and driven screws) and corrects the arc profile of the line angle.

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“…Among all kinds of hydraulic pumps, the radial piston pump stands out for its high operating pressure. Most radial piston pumps can work above 200 bar (Moog, 2016; Zhao et al , 2016; Alves et al , 2011). A radial piston pump consists of shell, driving mechanism, distribution mechanism.…”

Section: Introductionmentioning

confidence: 99%

Double-rotator and valve plate distribution radial piston pump

Dong

Zhao

Fan

et al. 2019

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Purpose The drive shaft and the distribution shaft of a traditional radial piston pump are in a cantilever state. To solve this problem, this paper aims to present a radial piston pump with through shaft driving and valve plate distribution. Design/methodology/approach The working principle of the pump is discussed in detail. In this radial piston pump, valve plate distribution parts are designed to distribute oil to the piston chambers, and the distribution shaft is replaced. A bearing is installed between the stator and rotator to reduce the friction. The transmission shaft is supported by two bearings to ensure smooth operation. The support force of the transmission shaft is optimized. In addition, the flow pulsation principle is presented. To accomplish the change, the displacement of the radial piston pump, the proportional control system is designed. Findings After completing the machining and assembly of the pump, an experimental study was carried out. The results show that the output flow of the pump is basically the same as the theoretical flow. Originality/value The friction between the slipping shoes and the stator is greatly reduced due to the function of rolling bearings. The higher stability of the driveshaft is obtained for the reason of double-sided support. The radial piston pump has a novel structural design in reducing the friction between the shoes and the stator and improving the stability of the transmission shaft.

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Precision grinding of screw rotors using CNC method

Cited by 28 publications

References 13 publications

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

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

Design and experimental analysis of end face profile of tri-screw pump

Double-rotator and valve plate distribution radial piston pump

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