Multi-tasking Machine Tools Research Articles

811 複合加工機における運動平面の傾きが動的精度に及ぼす影響(生産加工・工作機械I)

811 複合加工機における運動平面の傾きが動的精度に及ぼす影響(生産加工・工作機械I)

5軸加工を考慮した複合加工機用CAMシステムの開発(機械要素,潤滑,設計,生産加工,生産システムなど)

5軸加工を考慮した複合加工機用CAMシステムの開発(機械要素,潤滑,設計,生産加工,生産システムなど)

複合加工機による鎖形状の巧妙加工(機械要素,潤滑,設計,生産加工,生産システムなど)

複合加工機による鎖形状の巧妙加工(機械要素,潤滑,設計,生産加工,生産システムなど)

Development of a High-Performance Spindle for Multitasking Machine Tools

In recent years, high-performance spindles are required for multi-tasking machine tools to enhance the productivity. Such spindles enable efficient rough cutting and fine finishing of a workpiece on one machine. In order to meet this requirement, a spindle unit must be highly stiff and operate at high rotational. Spindle specifications require a rotational number of 50,000min-1 and dN value of 3,000,000, a smaller motor was downsized and an electric loss restrained by reducing the thickness of laminate sheets composing the rotor core. A direct-injection type of ultra trace quantity lubrication and a preload switching system were used for ball bearings for high rotational speed and high stiffness. We discuss how these technical requirements were met and the results of basic experiments.

複合加工機用CAMシステムの研究(機械要素,潤滑,設計,生産加工,生産システムなど)

複合加工機用CAMシステムの研究(機械要素,潤滑,設計,生産加工,生産システムなど)

A study on the development of a multi-purpose spindle system for quality productive machining

A compact multi-purpose spindle for multi-tasking machine tools has been developed such that it can provide high power and torque for lower speed ranges while it rotates at high speeds for light duty machining. The innovative design based on the dual direct drive concept has been adopted such that the size of the spindle can stay the same as a conventional spindle of its class. For optimizing the design process, a method based on the complete virtual approach using 3D solid models has been studied and developed. Machining performance has been verified through a physical prototype.

A10 Development of CAM System for Multi-tasking Machine Tools(Digital design and digital manufacturing(CAD/CAM))

A10 Development of CAM System for Multi-tasking Machine Tools(Digital design and digital manufacturing(CAD/CAM))

Precision Spindle Metrology

The demand for advancement of the accuracy and productivity in production systems continues to increase. At the heart of these production demands are high-speed machine tools and multi-tasking machine tools; at the heart of these machine tools are their spindles. These spindles continue to increase in variety, maximum speed, and number of spindles per machine; therefore, standardization and accurate and efficient tests of spindle performance have been demanded by the pursuit of productivity. Especially needful are tests at full operating speed rather than simple static measurements.With these points as background, the ISO standard on “Geometric accuracy of axes of rotation (ISO230-7)” was released in 2006 as the universal performance test method for machine tool spindles to help comply with these ever increasing demands.Given these current demands, the publication of Precision Spindle Metrology is very significant. This book will be very helpful to the study of the necessary concepts and techniques in the measurement and analysis of spindle performance. Because the contents of the book are detailed and practical, it will help establish a complete system for the metrology of precision spindles. The book addresses all of the important considerations for spindle metrology:The spindle error motion is systematically classified based on the mode of error motion, behavior in the frequency domain, and the sensitive direction for machining accuracy. The required measurement and analysis techniques for accurate assessment of spindle performance are clearly explained.All elements required for establishing a metrology system for precision spindles are described in detail:fundamental knowledge of the required instruments: Artifact, sensor, fixture, and data acquisition system;environmental effects to be considered for reliable results from performance tests;fundamental knowledge of data acquisition and processing the acquired data;filtering techniques in data acquisition and analysis;methods for separation of the artifact error from the acquired data and their features.Case studies of metrology systems for spindles of typical machine tools and bearings (a major element of machine tools) are described with measurement data.Ample bibliography is attached at the end of chapter to study more in detail.This book gives deep understanding of the metrology of precision spindles. Marsh describes the concepts, methods, and their meaning for measurement and analysis of spindle performance in detail with abundant figures and actual values as examples. Moreover, detailed description is given to critical factors worthy of our attention in the measurement process and how we should analyze the acquired data. This makes the book very practical.This book will be helpful for engineers and researchers in the precision machine industry as well as students trying for the first time to carry out performance tests of the rotational element with high accuracy such as machine tool spindles. In addition, this book will also help the readers very much who want to carry out spindle performance tests according to ISO230-7.

Special Issue on Multiaxis Control and Multitasking Machine Tools

Machine tools using numerical control (NC) devices are typical mechatronics products and a powerful way to automate plant production. The introduction of multiaxis control and multitasking machine tools to workshops is growing to meet the requirements of highly efficient, precision machining of a variety of complex products and mold dies. The increase in the number of control axes and multitasking capability in one chucking process enable machine tools to manufacture complex products efficiently and accurately. Given the strong attention and interest multiaxis control and multitasking machine tools are attracting, it is about time to introduce the current state of the art of these tools and their practical and applicable technologies, especially in Japan. This special issue covers the development of 5-axis control machining centers, machine tools having multispindle heads with 5-axis control, 5-axis control CAMs, accuracy evaluation for 5-axis control machine tools, and more. We thank the authors for their interesting papers to this special issue, and are certain that both general readers and specialists will find the information they provide both interesting and informative.

113 INTEGREXによる耐熱合金の高速旋削加工([3]多軸制御加工・工作機械(1))(OS3 最新工作機械)

The demand of high-speed turning for a superheat resistant alloy has recently been increasing in a field of aviation / space industry. Therefore, this paper proposes a new approach of high-speed turning for inconel718 by use of a multi-tasking machine tool that fused with a lathe and a machining center. As a result of machining test by the new machining method, it was realized that new method is 2.4 times of the conventional method in machining efficiency.