Feature Based Machine Tool Accuracy Analysis Method

Purpose The purpose of this paper is to present a method for the environmental impact analysis of machine-tool cutting, which enables the detailed analysis of inventory data on resource consumption and waste emissions, as well as the quantitative evaluation of environmental impact. Design/methodology/approach The proposed environmental impact analysis method is based on the life cycle assessment (LCA) methodology. In this method, the system boundary of the cutting unit is first defined, and inventory data on energy and material consumptions are analyzed. Subsequently, through classification, five important environmental impact categories are proposed, namely, primary energy demand, global warming potential, acidification potential, eutrophication potential and photochemical ozone creation potential. Finally, the environmental impact results are obtained through characterization and normalization. Findings This method is applied on a case study involving a machine-tool turning unit. Results show that primary energy demand and global warming potential exert the serious environmental impact in the turning unit. Suggestions for improving the environmental performance of the machine-tool turning are proposed. Originality/value The environmental impact analysis method is applicable to different machine tools and cutting-unit processes. Moreover, it can guide and support the development of green manufacturing by machinery manufacturers.

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The Coupling Characteristic of HSK Tool-Holder/Spindle Interface for High-Speed NC Machine Tool

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.590.121 ◽

2014 ◽

Vol 590 ◽

pp. 121-125 ◽

Cited By ~ 1

Author(s):

Wen Kai Jie ◽

Jian Chen ◽

Deng Sheng Zheng ◽

Gui Cheng Wang

Keyword(s):

Machine Tool ◽

Rotational Speed ◽

High Speed ◽

Nonlinear Finite Element Method ◽

High Rotational Speed ◽

Tool Holder ◽

Nc Machine Tool ◽

Machine Tool Accuracy ◽

Nc Machine ◽

Coupling Characteristic

The coupling characteristic of the tool-holder/spindle interface in high speed NC machine has significant influence on machine tool accuracy and process stability. With the example of HSK-E63, based on nonlinear finite element method (FEM), the coupling characteristic of the tool-holder/spindle interface under high rotational speed was investigated, the influence of interference, clamping force and rotational speed on the contact stress and the sectional area of clearance were discussed in detail. The results can be used as theoretical consideration to design and optimize the high speed tool-holder/spindle interface.

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An accuracy analysis method for first-order reliability method

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406218813389 ◽

2018 ◽

Vol 233 (12) ◽

pp. 4319-4327 ◽

Cited By ~ 2

Author(s):

Zhenzhong Chen ◽

Zihao Wu ◽

Xiaoke Li ◽

Ge Chen ◽

Guangfeng Chen ◽

...

Keyword(s):

Structural Reliability ◽

Nonlinear Problems ◽

Accuracy Analysis ◽

Analysis Method ◽

First Order Reliability Method ◽

First Order ◽

Reliability Level ◽

Reliability Method ◽

Value Range ◽

Crashworthiness Design

The first-order reliability method is widely used for structural reliability analysis; however, its accuracy would become worse for nonlinear problems. This paper proposes the accuracy analysis method of the first-order reliability method, which considers the worst cases when using the first-order reliability method and gives the possible value range of the probability of safety. The accuracy analysis method can evaluate the reliability level of the first-order reliability method when the failure surfaces are nonlinear. The calculation formula for the possible value range of the probability of safety is proposed, and its trend as the dimensions and reliability rise is also discussed in this paper. A numerical example and a honeycomb crashworthiness design are presented to validate the accuracy of the first-order reliability method, and the results show that they are located within the possible value range proposed in this paper.

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A Knowledge-Based System for Machining Operation Planning in Feature Based, Open-Architecture Manufacturing

Volume 1: Design for Manufacturing Conference ◽

10.1115/96-detc/dfm-1286 ◽

1996 ◽

Author(s):

James A. Stori ◽

Paul K. Wright

Keyword(s):

Machine Tool ◽

Tool Path ◽

Integrated Design ◽

Object Oriented ◽

Planning System ◽

Open Architecture ◽

Operation Planning ◽

Trade Offs ◽

Feature Based ◽

Machining Parameter

Abstract Within the Integrated Design And Manufacturing Environment (IMADE), operation planning provides a mapping from geometric design primitives to machining operation sequences for manufacturing processes. Operation planning includes tool selection, machining parameter selection, and tool path generation. An object oriented approach to program structure is adopted, whereby features, operations and tools, inherit behaviors and attributes from the appropriate class-hierarchies for the part, the manufacturing operations, and tooling classes. A detailed example is presented illustrating the operation planning search algorithm. Scripts are generated by the individual machining operations for execution on a machine tool. Tooling information is maintained in an object-oriented database through the FAR libraries for Common LISP. Examples of particular process plans show that the inherent trade-offs between specified precision and machining time can be investigated. An Open Architecture Machine Tool (MOSAIC-PM) has been used to machine the parts created by the feature based design and planning system. The novel contributions of this paper relate to the demonstration of “seamless” links between, a) design, b) planning, and c) actual fabrication by milling.

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706 High Accuracy Analysis Method by Only two Pictures for Electric Speckle Pattern Interferometry

The Proceedings of Conference of Kansai Branch ◽

10.1299/jsmekansai.2013.88._7-6_ ◽

2013 ◽

Vol 2013.88 (0) ◽

pp. _7-6_

Author(s):

Takuya INOUE ◽

Yasuhiko ARAI

Keyword(s):

Speckle Pattern ◽

High Accuracy ◽

Accuracy Analysis ◽

Analysis Method

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Effect of Supply Cooling Oil Temperature in Structural Cooling Channels on the Positioning Accuracy of Machine Tools

Journal of Mechanics ◽

10.1017/jmech.2019.29 ◽

2019 ◽

Vol 35 (6) ◽

pp. 887-900 ◽

Cited By ~ 2

Author(s):

K.-Y. Li ◽

W.-J. Luo ◽

M.-H. Yang ◽

X.-H. Hong ◽

S.-J. Luo ◽

...

Keyword(s):

Machine Tool ◽

Thermal Deformation ◽

Thermal Error ◽

Machining Accuracy ◽

Feed System ◽

Positioning Accuracy ◽

Cooling Channels ◽

Position Accuracy ◽

Machine Tool Accuracy ◽

Volume Method

ABSTRACTIn this study, the thermal deformation of a machine tool structure due to the heat generated during operation was analyzed, and embedded cooling channels were applied to exchange the heat generated during the operation to achieve thermal error suppression. Then, the finite volume method was used to simulate the effect of cooling oil temperature on thermal deformation, and the effect of thermal suppression was experimentally studied using a feed system combined with a cooler to improve the positioning accuracy of the machine tool. In this study, the supply oil temperature in the structural cooling channels was found to significantly affect the position accuracy of the moving table and moving carrier. If the supply oil temperature in the cooling channels is consistent with the operational ambient temperature, the position accuracy of the moving table in the Y direction and the moving carrier in the X and Z directions has the best performance under different feed rates. From the thermal suppression experiments of the embedded cooling channels, the positioning accuracy of the feed system can be improved by approximately 25.5 % during the dynamic feeding process. Furthermore, when the hydrostatic guideway is cooled and dynamic feeding is conducted, positioning accuracy can be improved by up to 47.8 %. The machining accuracy can be improved by approximately 60 % on average by using the embedded cooling channels in this study. Therefore, thermal suppression by the cooling channels in this study can not only effectively improve the positioning accuracy but also enhance machining accuracy, proving that the method is effective for enhancing machine tool accuracy.

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Analysis on Effect of Cooling Oil Temperature on Cutting Stability of Gear Shaping Machine

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.651-653.647 ◽

2014 ◽

Vol 651-653 ◽

pp. 647-650

Author(s):

Hai Tao Yu ◽

Lie Chen ◽

Chang Bing Zhou ◽

Rui Wen Guo

Keyword(s):

Machine Tool ◽

Processing System ◽

Cutting Stability ◽

Capability Index ◽

Cutting Test ◽

Machine Tool Accuracy ◽

The Stability ◽

Gear Shaping ◽

Accuracy And Stability

With the demands of machine tool accuracy and stability for manufacturing are getting higher and higher, the effect of cooling oil is increasingly evident. And it is proved that cooling oil temperature is an important factor for machine cutting precision and stability. Continuous cutting test was carried on and values of over pin dial (M) were measured. The results show that it has large effect of cooling oil temperature on the stability of M-value. Subsequently, test of machine capability index (CMK) was carried on. And it was verified that the CMK of gear shaping machine is larger than 1.67. And the results show that the fluctuation of M values is the smallest when cooling oil temperature is 33°C. Lowest time costing for adjusting the processing system, highest cutting accuracy, and smallest value of stable amplitude for Gear Shaping Machine could be obtained at this condition.

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