A New High-Precision Bearing Measuring System for Non-Repetitive Run-Out (NRRO)

2012 ◽  
Author(s):  
Zhaohui Yang ◽  
Jun Hong ◽  
Jinhua Zhang ◽  
Michael Yu Wang ◽  
Jian Liu
Keyword(s):  
High Precision ◽  
Axial Direction ◽  
Measuring System ◽  
Air Bearing ◽  
Angular Contact Ball Bearing ◽  
Displacement Sensors ◽  
Geometrical Errors ◽  
Ultra Precision ◽  
Spindle Vibration

As ultra-precision index of high-precision ball bearings, the value of non-repetitive run-out (NRRO) directly influences the rotation accuracy in complex mechanical system. Reducing NRRO contributes to improve the quality of manufacturing in machining tools. This paper developed a new high-precision bearing measuring system to analyze the NRRO of an angular contact ball bearing caused by geometrical errors of bearings’ parts. The characteristic of measuring system as follows: (1) The air-bearing spindle that is drive by servomotor is used to support the test bearing to ensure the system accuracy and continuously variable; (2) The air-bearing of flat is used to load of non-contact on the test bearing along axial direction for simulation conditions of bearings; (3) The multi-capacitive displacement sensors are used to measure run-out of the air-bearing spindle vibration of the radial direction, then the run-out is separated as system error; (4) The NRRO of axial and radial directions caused by geometrical errors of the rings raceways and the balls could be analyzed.

A New Method to Analyze Three-Dimensional Non-Repetitive Run-Out (3D-NRRO) of Angular Contact Ball Bearings

2011 ◽  
Author(s):  
Zhaohui Yang ◽  
Jun Hong ◽  
Jinhua Zhang ◽  
Micheal Yu Wang ◽  
Baotong Li
Keyword(s):  
Three Dimensional ◽  
Hertzian Contact ◽  
Contact Theory ◽  
Ball Bearings ◽  
Angular Contact Ball Bearing ◽  
Geometrical Errors ◽  
Ultra Precision ◽  
The Relationship ◽  
Hertzian Contact Theory

As ultra-precision index of high-precision ball bearings, the value of three-dimensional non-repetitive run-out (3D-NRRO) directly influences the rotation accuracy in complex mechanical system. Reducing 3D-NRRO contributes to improve the quality of manufacturing in machining tools. This paper develops five-freedom model to analyze the 3D-NRRO of an angular contact ball bearing caused by geometrical errors of the rings raceways and the balls. In the model, the variation of contact angle caused by centrifugal force of balls is taken into consideration, and the geometrical errors of rings raceway and balls are described by Fourier series. Meanwhile, based on Hertzian contact theory and the solution method of dimensional chains, the 3D-NRRO analytical program has been developed, the value of 3D-NRRO analysis is shown. From the results, the relationship between the 3D-NRRO and the geometrical errors of rings raceway and balls are analyzed quantitatively. Findings of this paper provide theoretical supports to reduce or control the 3D-NRRO by optimizing manufacturing process of bearing components.

Development of High-Acceleration and Ultra-Precision Linear Motor Driven Machining Center and its Characteristics

2010 ◽  
Vol 4 (5) ◽  
pp. 454-459 ◽  
Author(s):  
Kazuo Nakamoto ◽  
◽  
Shinichi Matsumoto ◽  
Masahiro Anzai ◽  
Keyword(s):  
High Precision ◽  
High Efficiency ◽  
Linear Motor ◽  
Measuring System ◽  
Machining Center ◽  
Hydrostatic Bearings ◽  
High Acceleration ◽  
Ultra Precision

We have developed machining centers, equipped with damping mechanism, for precision molds, which can not only suppress vibrations during high-acceleration driving of the machine but also perform high-precision and high-efficiency machining in micro regions. We have also achieved automatic exchanges of tools by employing ultrafast rotating main shafts with air hydrostatic bearings and automatic shrinkage fitting methods, as well as we have realized automated operations of the machine by integrating work with tool-measuring system.

Performance of High-Speed Precision Air-Bearing Spindle with Active Aerodynamic Bearing

2015 ◽  
Vol 9 (3) ◽  
pp. 297-302 ◽  
Author(s):  
Hiroshi Mizumoto ◽  
◽  
Yoichi Tazoe ◽  
Tomohiro Hirose ◽  
Katsuhiko Atoji ◽  
...  
Keyword(s):  
Rotational Speed ◽  
High Speed ◽  
Wedge Angle ◽  
Small Diameter ◽  
Air Bearing ◽  
Double Row ◽  
Single Row ◽  
Thrust Bearings ◽  
Spindle Vibration

A high-speed precision air-bearing tool spindle with active aerodynamic bearing is proposed for improving the quality of machining using small-diameter cutting and grinding tools. The spindle is basically supported by aerostatic radial and thrust bearings. According to the spindle vibration detected by capacitance sensors, the wedge angle of the active aerodynamic bearing was controlled using piezoelectric actuators, thereby suppressing the spindle vibration. In the present paper, the performances of a prototype air-bearing spindle with single-row active aerodynamic bearing and an improved air-bearing spindle with double-row bearings are reported. Through experiments, it was demonstrated that the maximum rotational speed controlled by the active aerodynamic bearing is 800 Hz (48,000 min-1), and that the amplitude of spindle vibration can be suppressed to <50 nm at the rotational speed of 500 Hz (30,000 min-1).

scholarly journals Geometric Measurements on a CNC Machining Device as an Element of Closed Door Technology

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4852
Author(s):  
Grzegorz Bomba ◽  
Artur Ornat ◽  
Piotr Gierlak
Keyword(s):  
Measurement System ◽  
Measurement Process ◽  
Cnc Machining ◽  
Measuring System ◽  
Cnc Machine ◽  
Statistical Process ◽  
Working Space ◽  
Closed Door ◽  
Accuracy And Repeatability

The article discusses the quality testing of a measuring system consisting of a CNC machine with measuring probes. The research was conducted in a broader context regarding the implementation of the closed door technology, i.e., production without human intervention, in an aviation plant manufacturing aircraft gearbox systems. This technology may involve automated measuring operations performed in machining centers, and not in measuring laboratories, provided that the quality of the measurements is appropriate. The aim of the study was to investigate whether the CNC machining device can be used to measure the geometric features of aircraft gearbox housing. For this purpose, measurement experiments were carried out with the use of three different probes. Measurements were carried out using four sequences of increasing complexity, so that, after error analysis, it was possible to find the causes of possible irregularities. A reference ring with known dimensions and position in the working space of the machine was used for the measurements performed as part of the assessment of the measurement system. The quality of the measurements was evaluated with the use of repeatability and reproducibility testing and statistical process control. The analysis results showed that the tested measurement system ensures adequate accuracy and repeatability, and the measurement process is characterized with adequate efficiency in relation to the manufacturing tolerance of the components produced using the machine. Thus, it was proven that the measurement process can be carried out on a machining device, which enables its integration into the closed door technology.

Homing Sensor System Design for a 2D Long Range Nanopositioning Moving Platform

2014 ◽  
Vol 615 ◽  
pp. 57-62 ◽  
Author(s):  
Raquel Acero Cacho ◽  
Jose Antonio Albajez ◽  
José Antonio Yagüe-Fabra ◽  
Marta Torralba ◽  
Margarita Valenzuela ◽  
...  
Keyword(s):  
Sensor System ◽  
Measuring System ◽  
Experimental Characterization ◽  
Measuring Systems ◽  
Precision Measuring ◽  
Atomic Force ◽  
Ultra Precision ◽  
Moving Platform ◽  
Sensor System Design

The nanotechnology field has been developing strongly in recent years and ultra-precision measuring systems are nowadays required. A new two-dimensional moving platform with 50x50 mm range of travel, nanometer resolution and sub micrometer accuracy is being designed by the authors in order to be integrated with an Atomic Force Microscope (AFM). In this work the definition, design and experimental characterization of a homing sensor system for this 2D moving platform is presented. The homing sensor system will allow the generation of an absolute 2D reference for the platform (X-Y axis and θz rotation), defining an initial cero for the measuring system, which is based on laser encoders.

A Method of the Comprehensive Evaluation of Surface Integrity in Micro- and Nano-Machining

2007 ◽  
Author(s):  
Guicheng Wang ◽  
Chunyan Zhang ◽  
Hongjie Pei ◽  
Yunming Zhu ◽  
Chungen Shen ◽  
...  
Keyword(s):  
Surface Integrity ◽  
Evaluation System ◽  
Metal Cutting ◽  
Comprehensive Evaluation ◽  
Rapid Development ◽  
Analytic Hierarchy ◽  
Ultra Precision ◽  
Edge Quality ◽  
Hierarchy Process

The surface quality is always the crucial element of machined quality in precision ultra-precision metal cutting. A new concept that the surface integrity should include the edge quality of parts is put forward In this paper, the weight value of a series of characteristic parameters of surface integrity are calculated with using analytic hierarchy process, three basic methods of evaluating surface integrity are presented, and the comprehensive evaluation system has been formed which will theoretically play a great important role on rapid development in the precision machining.

scholarly journals DORST Netshape® 4.0 – The Next Step Towards Autonomous Manufacturing

2021 ◽  
Author(s):  
Lutz Lackner ◽  
Mats Larsson
Keyword(s):  
Industry 4.0 ◽  
Manufacturing System ◽  
Measuring System ◽  
High Quality ◽  
Pressing Force ◽  
Part Geometry ◽  
Die Filling ◽  
New System

In the production of green parts from powder, there is unavoidable slight deviation in the die filling, even when high-quality powders are used. The quantity of powder in the die varies and thus affects the weight of the compact. This filling variation results in variation of the pressing force, and thus influences the part geometry. The development of the DORST Netshape&reg; System was conceived as an autonomous manufacturing system in order to compensate for these effects. Based on the Dorst Industry 4.0 innovations for part weight measuring immediately after pressing in combination with a laser dimension measuring system, this technology package attempts to reach enhanced precision and consistency in production. The paper presents results from various trials that show the capability of this new system, designed to improve the quality of pressed parts.

scholarly journals Developing a Measuring System for Monitoring the Thickness of the 6 m Wide HDPE/LDPE Polymer Geomembrane with Its Continuous Flow Using Automation Equipment

2021 ◽  
Vol 11 (21) ◽  
pp. 10045
Author(s):  
Tatyana Nikonova ◽  
Olga Zharkevich ◽  
Essim Dandybaev ◽  
Murat Baimuldin ◽  
Leonid Daich ◽  
...  
Keyword(s):  
Continuous Flow ◽  
High Density Polyethylene ◽  
Foreign Bodies ◽  
Automated System ◽  
Measuring System ◽  
Original Design ◽  
Software Complex ◽  
Automation Equipment ◽  
Production Conditions

As a result of R&D, a measuring system for controlling the thickness of the HDPE/LDPE (high-density polyethylene/low-density polyethylene) polymer geomembrane was developed using automation equipment. The relevance of this work consists of the development of a domestic, relatively inexpensive system for controlling the thickness of the HDPE/LDPE polymer geomembrane in production conditions based on modern equipment for enterprise automation. The scientific novelty consists of the use of original design solutions in the development of hardware and software complex mechanisms that allow controlling the thickness of the HDPE/LDPE polymer geomembrane layers along the entire width of the shaft, excluding deformation of the film as a result of foreign bodies entering during extrusion, cuts, monitoring the quality of the film in real time, as well as the possibility of analyzing the measured parameters in the database of the automated system.

Sign in / Sign up

Export Citation Format

Share Document