Minimum Error Tool Path Generation Method And An Interpolator Design Technique For Ultra Precision Multiaxis Cnc Machining
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Minimum Error Tool Path Generation Method And An Interpolator Design Technique For Ultra Precision Multiaxis Cnc Machining
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Author :
language : en
Publisher:
Release Date : 1999
Minimum Error Tool Path Generation Method And An Interpolator Design Technique For Ultra Precision Multiaxis Cnc Machining written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Piecewise Arc Length Parameterized Nurbs Tool Paths Generation For 3 Axis Cnc Machining Of Accurate Smooth Sculptured Surfaces
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Author : Maqsood Ahmed Khan
language : en
Publisher:
Release Date : 2010
Piecewise Arc Length Parameterized Nurbs Tool Paths Generation For 3 Axis Cnc Machining Of Accurate Smooth Sculptured Surfaces written by Maqsood Ahmed Khan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
In current industrial applications many engineering parts having complex shapes are designed using sculptured surfaces in CAD system. Due to the lack of smooth motions and accurate machining of these surfaces using standard linear and circular motions in conventional CNC machines, new commercial CNC systems are equipped with parametric curve interpolation function. However, in some applications these surfaces can be very complex that are susceptible to gouging and due to the approximation of; CL-path in CAM system and path parameter in real-time, high machining accuracy, smooth kinematic and feed-rate profiles, are difficult to achieve. This dissertation focuses on developing algorithms that generate tool paths in NURBS form for smooth, high speed and accurate sculptured surface machining. The first part of the research identifies and eliminates gouge cutter location (CL) point from the tool path. The proposed algorithm uses global optimization technique (Particle Swarm Optimization) to check all the CC-points along a tool-path with high accuracy, and only gouging free CC-points are used to generate the set of valid CL-points. Mathematical models have been developed and implemented to cover most of the cutter shapes, used in the industry. In the second phase of the research, all valid CL-points along the tool-path are used to generate CL-path in B-spline form. The main contribution of this part is to formulate an error function of the offset approximation and to represent it in NURBS form to globally bound the approximation errors. Based on this error function, an algorithm is proposed to generate tool-paths in B-spline from with; globally controlled accuracy, fewer control points and low function degree, compared to its contemporaries. The proposed approach thus presents an error-bounded method for B-spline curve approximation to the ideal CL-path within the accuracy. This part of research has two components, one is for 2 1/2- axis (pocket) and the other one is for 3-axis (surface) CNC machining. The third part deals with the problem of CL-path parameter estimation during machining in real time. Once the gouging free CL-path in NURBS form with globally controlled accuracy is produced, it is re-parameterized with approximate arc-length in the off-line stage. The main features of this work are; (1) sampling points and calculating their approximate arc-lengths within error bound by decomposing the input path into Bezier curve segments, (2) fitting the NURBS curve with approximate arc-length parameter to the sample points until the path and parameterization errors are within the tolerance, and (3) segment the curve into pieces with different feed rates if during machining the cutter trajectory errors are beyond the tolerance at highly curved regions in the NURBS tool path.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1994
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Mechanics, Applied categories.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1999
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Dissertation abstracts categories.
Real Time Surface Interpolars For Multi Axis Cnc Machine Tools
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Author : Rong-Shine Lin
language : en
Publisher:
Release Date : 1994
Real Time Surface Interpolars For Multi Axis Cnc Machine Tools written by Rong-Shine Lin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Automatic Tool Path Generation For Multi Axis Machining
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Author : Laxmiprasad Putta
language : en
Publisher:
Release Date : 1998
Automatic Tool Path Generation For Multi Axis Machining written by Laxmiprasad Putta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Toolpath Generation For Ultraprecision Machining
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Author : Neil Naples
language : en
Publisher:
Release Date : 2018
Toolpath Generation For Ultraprecision Machining written by Neil Naples and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Industrial engineering categories.
The rise in complexity of freeform optics has driven the development of equally complex manufacturing processes needed to produce them. From freeform lens molds, to large freeform mirrors, to steep microlens arrays on non-flat base surfaces, optics manufacturing has traditionally been time-consuming and error prone – often requiring hand lapping and polishing – to produce optics to their final shape. Due to its inherent precision, deterministic nature, and net shape capabilities, ultraprecision diamond machining (UPDM) has matured into a highly preferred and reliable method for the direct machining of freeform optics. However, complex optical surfaces require equally complex machining toolpaths and techniques that can generate them. The goal of this research is to develop enabling technologies that vastly improve existing toolpath generation techniques for freeform optics. These new technologies allow complex optical surfaces, natively described by explicit surface equations and defined inside arbitrary boundaries, to be efficiently machined. To this end, studies on both the distribution of points that define a set of independent coordinates (Cartesian XY or polar R¿) and the calculation of dependent coordinates – optical sag values – are considered. Each study had its own objectives of reducing machining cycle time and machine tool accelerations/following error without sacrificing surface finish.
A Novel Accuracy Analysis Method Of Dynamic Cnc Machine Tool Motion By Parallel Integration Of Nano Precision Linear Scales
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Author : Michael Benjamin Brown
language : en
Publisher:
Release Date : 2017
A Novel Accuracy Analysis Method Of Dynamic Cnc Machine Tool Motion By Parallel Integration Of Nano Precision Linear Scales written by Michael Benjamin Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Many accuracy analysis and calibration methods have been developed and are in place to optimize and maintain the manufacturing quality of a machine tool. Depending on the error type, different identification and compensation techniques are better suited for the error handling. High precision manufacturing has achieved micron scale accuracy and repeatability; however, to understand and evaluate errors on a nano-scale, a new analysis mechanism is required. Current error analysis tools require use of the machining workspace, which suffice for unloaded axial motion, but not when accounting for cutting forces, workpiece material and loading, and kinematic errors at a sub-micron scale. The SmartScale system was integrated into a second generation NHX4000 prototype machine to prove that error analysis can take place concurrently during a cutting process. Furthermore, the SmartScale system integrates encoders with a 10nm resolution and outputs data in a .csv format, so position errors can be analyzed externally on a nano-scale. The output from this system compares directly to the calibration techniques used with the machine tools and is capable of producing and analyzing all of the same data without the reconfigured equipment setup and with a higher precision. When applying this system, it’s clear that there are propagating position errors along the axes and yawing at the tool tip and table center. Additionally, the SmartScale system is designed to pass position data to an interpolator in real time, which will support integration of compensation mechanisms to correct these errors during the machining process and repeatedly produce parts with nano-scale accuracy.
Introduction To Precision Machine Design And Error Assessment
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Author : Samir Mekid
language : en
Publisher: CRC Press
Release Date : 2008-12-23
Introduction To Precision Machine Design And Error Assessment written by Samir Mekid and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-12-23 with Science categories.
While ultra-precision machines are now achieving sub-nanometer accuracy, unique challenges continue to arise due to their tight specifications. Written to meet the growing needs of mechanical engineers and other professionals to understand these specialized design process issues, Introduction to Precision Machine Design and Error Assessment places
Mechatronic Systems
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Author : Clarence W. de Silva
language : en
Publisher: CRC Press
Release Date : 2007-10-17
Mechatronic Systems written by Clarence W. de Silva and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-10-17 with Technology & Engineering categories.
Mechatronics has emerged as its own discipline over the past decade, yet no reference has lived up to the demands of being a working guide for designing and implementing the new generation of mechatronic systems. Uniting an international team of leading experts, Mechatronic Systems: Devices, Design, Control, Operation and Monitoring rises to the ch