Development of Dynamic Loading Device for Rotating Spindle of Machine Tools

2012 ◽  
Vol 523-524 ◽  
pp. 544-549
Author(s):  
Ryota Sawamura ◽  
Shinya Ikenaga ◽  
Atsushi Matsubara
Keyword(s):  
Dynamic Loading ◽  
Machine Tools ◽  
High Speed ◽  
High Performance ◽  
Loading Rate ◽  
Electric Response ◽  
Loading Test ◽  
Loading Device ◽  
Magnetic Loading ◽  
The Magnetic Field

High performance milling spindles, which have high rigidity and high speed, are required for high productive machining. In order to evaluate the rigidity change of the spindle, authors has been developed a magnetic loading device. This device provides attractive force in radial direction to a dummy tool attached to a spindle. By using this device, the static stiffness of the rotating spindle has been successfully evaluated. However the loading rate could not be controlled due to the electric response lag caused by the magnetic field. To solve this problem, electric response of the coil-tool system with the air gap is analyzed and the dynamic response is estimated. The air-gap's influence on the load was also evaluated. Based on the analysis, a dynamic loading test is designed carried out for the measurement of the rigidity of a machine tool spindle.

scholarly journals Measurement of Rigidity Change of Preload Switching Spindle

2012 ◽  
Vol 6 (2) ◽  
pp. 175-179 ◽  
Author(s):  
Taku Yamazaki ◽  
◽  
Atsushi Matsubara ◽  
Shinya Ikenaga ◽  
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Rigidity ◽  
High Speeds ◽  
Loading Device ◽  
Magnetic Loading ◽  
Simulation Results ◽  
Load Displacement ◽  
Low Speeds ◽  
Relationship Of

High performance milling spindles with high rigidity and high speed are required for high productive machining. A preload switching spindle has been designed to obtain high rigidity at low speeds while avoiding bearing burn at high speeds. In this report, the load-displacement relationship of a preload switching spindle is measured with a non-contact magnetic loading device. Measurement and simulation results are compared to clarify the rigidity change by preload switching.

A dynamic loading system for high-speed motorized spindle with magnetorheological fluid

2018 ◽  
Vol 29 (13) ◽  
pp. 2754-2765 ◽  
Author(s):  
Shengli Tian ◽  
Xiaoan Chen ◽  
Ye He ◽  
Tianchi Chen ◽  
Peiming Li
Keyword(s):  
Dynamic Loading ◽  
High Speed ◽  
Dynamic Performance ◽  
Temperature Stability ◽  
Magnetorheological Fluid ◽  
Experimental Results ◽  
Motorized Spindle ◽  
Loading Test ◽  
Linear Relationships ◽  
Loading System

A high-speed dynamic loading test is a key step when testing the dynamic performance and running quality of a high-speed motorized spindle. A loading test is very difficult to perform at high speeds. Based on the rheological behavior of the magnetorheological fluid, a novel high-speed dynamic loading system for a high-speed motorized spindle was designed, fabricated, and tested. The working principles and structure of this loading system are described. The torque model of the loader was derived based on the Herschel–Bulkley model and electromagnetic simulation using the finite element method. In addition, the torque–current relationship under different speeds was analyzed by experiments, and we found non-linear relationships between the viscosity and shear stress of the magnetorheological fluid with the shear rate. The Herschel–Bulkley model was corrected by fitting for the experimental results. The loading torque, calculated by the modified model, complied with the experimental results. This lays the foundation for the design of a high-speed transmission device based on the magnetorheological shear principle. Experiments of torque stability, temperature stability, and reusability verified the feasibility and accuracy of the proposed loading system. It provides a novel method to test the dynamic loading performance of high-speed motorized spindles.

Machine Tools Mechatronic Analysis

2006 ◽  
Vol 220 (3) ◽  
pp. 345-353 ◽  
Author(s):  
R Maj ◽  
F Modica ◽  
G Bianchi
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
High Performance ◽  
Dynamic Behaviour ◽  
Traditional Approach ◽  
Optimization Technique ◽  
Numerical Control ◽  
Milling Machine ◽  
Mechanical Structure ◽  
High Speed Machine

High-speed machine tools show close interaction between the dynamic behaviour of the mechanical structure, drives, and numerical control. In order to support the designer of high-performance machines, a new analysis based on an integrated holistic mechatronic optimization technique is proposed and compared with the traditional approach. The proposed approach is applied to a three-axis milling machine for dies and mould production.

scholarly journals Numerical Analysis of Temperature Rise during Dynamic Loading for Dissimilar Steel Joint Specimen

2018 ◽  
Vol 941 ◽  
pp. 280-286 ◽  
Author(s):  
Yasuhito Takashima ◽  
Fumiyoshi Minami
Keyword(s):  
Temperature Field ◽  
Dynamic Loading ◽  
High Speed ◽  
Frame Rate ◽  
Loading Test ◽  
Dissimilar Steel ◽  
Steel Joint ◽  
Joint Specimen ◽  
Bonded Interface ◽  
Dissimilar Steel Joint

In this study, dynamic temperature field in a dissimilar steel joint specimen was numerically analyzed by means of three-dimensional explicit finite element analysis. Fully coupled thermal stress analysis was performed by using FE-code Abaqus/Explicit ver. 6.12. It was assumed that 90% of the plastic work was transferred to heat. Furthermore, dynamic loading tests were conducted with three-point bending specimen extracted from the dissimilar steel joint between a mild steel and a high tensile strength class steel. The specimen included a U-shape notch in the bonded interface. A high-speed infrared camera was used to measure the temperature field near the bonded interface. The temperature field was recorded at a frame rate of 200 Hz during the dynamic loading test. The numerically calculated temperature field near bonded interface showed reasonable agreement with the temperature field measured by the high-speed infrared thermography. The temperature in the soft steel particularly increased during the dynamic loading. On the other hand, the increase in temperature in the hard steel area was relatively few.

Application of Sandwich-Based Designs on Main Structural Parts of Machine Tools

2011 ◽  
Author(s):  
Jan Smoli´k ◽  
Viktor Kuli´sˇek ◽  
Miroslav Janota
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
High Speed ◽  
High Performance ◽  
Transportation Industry ◽  
Static Stiffness ◽  
Modal Damping ◽  
Machine Tool Structures ◽  
Structural Parts

New, higher and challenging properties of new high-speed machines and high-performance machines bring up many questions connected to the design and properties of the main machine tool structures. Parameters like static stiffness, eigenfrequencies, modal damping and mass of parts may be identified as very important, and all these properties need to be improved. The most important material properties in the field of machine tools are presented in this paper. A case study based on a modification of a real horizontal machining centre is introduced. The modification consists in using a sandwich design concept in the main structural machine tool part. The sandwich concept, widely known and used in the aerospace industry and, more generally, the transportation industry, is not commonly used in machine tool design. A significant reduction of mass has been achieved by manufacturing a hybrid column with aluminum foam cores, while static stiffness has not been affected.

scholarly journals A HAWAII-2RG infrared camera operated under fast readout mode for solar polarimetry

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Yoichiro Hanaoka ◽  
Yukio Katsukawa ◽  
Satoshi Morita ◽  
Yukiko Kamata ◽  
Noriyoshi Ishizuka
Keyword(s):  
Magnetic Field ◽  
High Speed ◽  
High Performance ◽  
Near Infrared ◽  
Infrared Camera ◽  
Solar Magnetic Fields ◽  
Solar Filaments ◽  
Infrared Wavelengths ◽  
Solar Polarimetry ◽  
The Magnetic Field

AbstractPolarimetry is a crucial method to investigate solar magnetic fields. From the viewpoint of space weather, the magnetic field in solar filaments, which occasionally erupt and develop into interplanetary flux ropes, is of particular interest. To measure the magnetic field in filaments, high-performance polarimetry in the near-infrared wavelengths employing a high-speed, large-format detector is required; however, so far, this has been difficult to be realized. Thus, the development of a new infrared camera for advanced solar polarimetry has been started, employing a HAWAII-2RG (H2RG) array by Teledyne, which has $$2048~\times 2048$$ 2048 × 2048 pixels, focusing on the wavelengths in the range of $$1.0\;{-}\;1.6\;~\mu {\text{m}} $$ 1.0 - 1.6 μ m . We solved the problem of the difficult operation of the H2RGs under “fast readout mode” synchronizing with high-speed polarization modulation by introducing a “MACIE” (Markury ASIC Control and Interface Electronics) interface card and new assembly codes provided by Markury Scientific. This enables polarization measurements with high frame-rates, such as 29–117 frames per seconds, using a H2RG. We conducted experimental observations of the Sun and confirmed the high polarimetric performance of the camera.

Impact overload tests on triangulated steel frames

1969 ◽  
Vol 313 (1512) ◽  
pp. 117-129
Keyword(s):  
Yield Stress ◽  
Dynamic Loading ◽  
High Speed ◽  
Steel Frames ◽  
Transient Load ◽  
Modes Of Failure ◽  
Loading Device ◽  
Proportional Increase ◽  
Transient Force

Tests are reported on sixteen pinjointed, triangulated steel frames, subjected to impulsive overload. The frames were statically determinate, consisting of a single strut, tie and connexion; the load was applied by a spring loading device. Records were taken of the transient force pulses and high-speed photographs showed the various modes of failure. The load on frames which failed by yielding at the tie exceeded the corresponding static value by a factor approximating closely to the proportional increase of yield stress under dynamic loading. In some experiments strut failure occurred under a transient load many times the corresponding static value. In many both members showed signs of failure with a change of mode during the course of deformation.

scholarly journals A HAWAII-2RG infrared camera operated under fast readout mode for solar polarimetry

2020 ◽  
Author(s):  
Yoichiro Hanaoka ◽  
Yukio Katsukawa ◽  
Satoshi Morita ◽  
Yukiko Kamata ◽  
Noriyoshi Ishizuka
Keyword(s):  
Magnetic Field ◽  
High Speed ◽  
High Performance ◽  
Near Infrared ◽  
Infrared Camera ◽  
Polarization Modulation ◽  
Solar Magnetic Fields ◽  
Infrared Wavelengths ◽  
Solar Polarimetry ◽  
The Magnetic Field

Abstract Polarimetry is a crucial method to investigate solar magnetic fields. From the viewpoint of space weather, the magnetic field in solar laments, which occasionally erupt and develop into interplanetary flux ropes, is of particular interest. To measure the magnetic field in laments, high-performance polarimetry in the near-infrared wavelengths employing a high-speed, large-format detector is required; however, so far, this has been difficult to be realized. Thus, the development of a new infrared camera for advanced solar polarimetry has been started, employing a HAWAII-2RG (H2RG) array by Teledyne, which has 2048 x 2048 pixels, focusing on the wavelengths in the range of 1.0{1.6 um. We solved the problem of the difficult operation of the H2RGs under "fast readout mode" synchronizing with high-speed polarization modulation by introducing a "MACIE" (Markury ASIC Control and Interface Electronics) interface card and new assembly codes provided by Markury Scientific This enables polarization measurements with high frame-rates, such as 29{117 frames per seconds, using a H2RG. We conducted experimental observations of the Sun and confirmed the high polarimetric performance of the camera.

Improvement of Thermal Deformation in a Newly Developed Steel CFRP Composite Ball Screw

2020 ◽  
Author(s):  
Hayato Yoshioka ◽  
Shunya Saito ◽  
Jun Kato ◽  
Hidenori Shinno ◽  
Shunsuke Goto ◽  
...  
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
High Performance ◽  
Thermal Deformation ◽  
High Efficiency ◽  
Cooling System ◽  
Cutting Tools ◽  
Large Error ◽  
Ball Screw ◽  
Positioning Accuracy

Abstract Machine tools are required to realize high precision and high efficiency machining by various industry sectors. A machine tool has some driving systems to position cutting tools and workpieces, and hence driving units are required high speed and precision positioning. However, high speed feed motion causes thermal deformation due to generated heat at friction surfaces such as guideway, feed screw, and bearings, it deteriorates positioning accuracy of driving units. Thermal deformation of a ball screw is one of large error factors of lower positioning accuracy, and a cooling system for reducing thermal deformation is installed into machine tools. Since the cooling system needs additional cost and space in machining systems, a new method for minimizing thermal deformation is required. In this study, a new structure of ball screw is proposed in order to meet these requirements. A new ball screw which has a core pipe made of CFRP was developed. CFRP is one of composite materials which have light weight and low thermal expansion. This paper presents analysis results of a simplified FEM model of the ball screw and the basic experimental results of the developed ball screw. These results confirmed that the proposed ball screw was applied to high performance positioning system in machine tools.

A Low-Profile Planar Motion Table System Driven by Steel Belt

2015 ◽  
Vol 9 (6) ◽  
pp. 739-745 ◽  
Author(s):  
Hayato Yoshioka ◽  
◽  
Hidenori Shinno ◽  
Hiroshi Sawano ◽  
◽  
...  
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
High Performance ◽  
Material Handling ◽  
Degree Of Freedom ◽  
Planar Motion ◽  
Driving Mechanism ◽  
Driving System ◽  
Low Profile ◽  
Inspection Systems

Machine tools and inspection systems require high performance positioning table systems that have long travel ranges, lower profile structures, multi-degree-of-freedom motion, and high speed motion, simultaneously. This paper presents a newly developed low-profile planar motion table system driven by steel belts. The driving system has two steel belts, two servo motors, and four ball spline shafts. These elements are symmetrically arranged on the same plane, and the moving table realizes planar motion. After confirming the effectiveness of the proposed driving mechanism with a one-axis table system, the planar table system developed is evaluated through the some positioning experiments. The results confirm that the developed table system is useful in material handling and other applications.

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