NDLI: On Clamping Planning in Workpiece-Fixture Systems

Content Provider	IEEE Xplore Digital Library
Author	Cai-Hua Xiong Wang, M.Y. You-Lun Xiong
Copyright Year	2004
Abstract	Deformations of contacts between the workpiece and locators/clamps resulting from large contact forces cause overall workpiece displacement, and affect the localization accuracy of the workpiece. An important characteristic of a workpiece-flxture system is that locators are passive elements and can only react to clamping forces and external loads, whereas clamps are active elements and apply a predetermined normal load to the surface of workpiece to prevent it from losing contact with the locators. Clamping forces play an important role in determining the final workpiece quality. This paper presents a general method for determining the optimal clamping forces including their magnitudes and positions. First, we derive a set of "compatibility" equations that describe the relationship between the displacement of the workpiece and the deformations at contacts. Further, we develop a locally elastic contact model to characterize the nonlinear coupling between the contact force and elastic deformation at the individual contact. We define the minimum norm of the elastic deformations at contacts as the objective function, then formulate the problem of determining the optimal clamping forces as a constrained nonlinear programming problem which guarantees that the fixturing of the workpiece is force closure. Using the exterior penalty function method, we transform the constrained nonlinear programming into an unconstrained nonlinear programming which is, in fact, the nonlinear least square. Consequently, the optimal magnitudes and positions of clamping forces are obtained by using the Levenberg-Marquardt method which is globally convergent. The proposed planning method of optimal clamping forces, which may also have an application to other passive, indeterminate problems such as power grasps in robotics, is illustrated with numerical example.
Sponsorship	IEEE Robotics and Automation Society
Starting Page	407
Ending Page	419
Page Count	13
File Size	1176411
File Format	PDF
ISSN	15455955
Volume Number	5
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Clamps Fixtures Functional programming Machining Manufacturing processes Laboratories Nonlinear equations Deformable models Couplings Least squares methods force closure Clamping planning contact forces elastic deformation fixture
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

An Elastic Contact Model for the Prediction of Workpiece-Fixture Contact Forces in Clamping

Clamping Planning in Workpiece-Fixture Systems

The Application of Meta Functions to the Quasi-Static Analysis of Workpiece Displacement Within a Machining Fixture

Optimal Placement of Fixture Clamps: Minimizing the Maximum Clamping Forces

Automatic planning approach for rapid fixture

Efficient prediction of workpiece-fixture contact forces.

Systematic Modeling of Workpiece-Fixture Geometric Default and Compliance for the Prediction of Workpiece Machining Error

Integrated model based thin-walled part machining precision control for the workpiece-fixture system

A slack-based method to clamping force optimization for fixture design

On Clamping Planning in Workpiece-Fixture Systems

Similar Documents

An Elastic Contact Model for the Prediction of Workpiece-Fixture Contact Forces in Clamping

Clamping Planning in Workpiece-Fixture Systems

The Application of Meta Functions to the Quasi-Static Analysis of Workpiece Displacement Within a Machining Fixture

Optimal Placement of Fixture Clamps: Minimizing the Maximum Clamping Forces

Automatic planning approach for rapid fixture

Efficient prediction of workpiece-fixture contact forces.

Systematic Modeling of Workpiece-Fixture Geometric Default and Compliance for the Prediction of Workpiece Machining Error

Integrated model based thin-walled part machining precision control for the workpiece-fixture system

A slack-based method to clamping force optimization for fixture design

On Clamping Planning in Workpiece-Fixture Systems