Geometric and Kinetic Model Based Computer-Aided Fixture Design Verification

2003 ◽  
Vol 3 (3) ◽  
pp. 187-199 ◽  
Author(s):  
Y. Kang ◽  
Y. Rong ◽  
J. A. Yang
Keyword(s):  
Kinetic Model ◽  
Kinetic Models ◽  
Fixture Design ◽  
Clamping Force ◽  
Design Verification ◽  
Modular Fixtures ◽  
Computer Aided ◽  
Machining Operations ◽  
Tolerance Assignment

Computer-aided fixture design (CAFD) techniques have advanced to the point that fixture configurations can be generated automatically, for both modular fixtures and dedicated fixtures. Computer-aided fixture design verification (CAFDV) is a technique for verifying and improving existing fixture designs. This paper introduces a first comprehensive CAFDV framework which uses both geometric and kinetic models to verify locating completeness, locating accuracy, and fixturing stability. The models can be also used for locating tolerance assignment and the determination of minimum clamping force required in machining operations. The system is integrated with commercial CAD package and applied in industrial real-cases.

Computer-Aided Fixture Design Verification: Part II — Tolerance Analysis

2002 ◽  
Author(s):  
Y. Kang ◽  
Y. Rong ◽  
J. C. Yang
Keyword(s):  
Sensitivity Analysis ◽  
Tolerance Analysis ◽  
Primary Task ◽  
Fixture Design ◽  
Design Verification ◽  
New Approach ◽  
Machining Feature ◽  
Computer Aided ◽  
Tolerance Assignment

Tolerance analysis is the most important issue in computer-aided fixture design (CAFD) since the primary task of fixturing is to ensure the quality of machining, and it is an important part in computer-aided fixture design verification (CAFDV). This study presents a new approach for fixture tolerance analysis that is more generalized and can be used to assign locator tolerances based on machining surface tolerance requirements. The tolerance analysis is also generalized to handle any type of fixture designs, workpieces, datum features, and machining feature tolerances. Locator tolerance assignment distributes tolerances to locators based on a sensitivity analysis.

Computer-Aided Fixture Design Verification: Part 1 — The Framework and Modeling

2002 ◽  
Author(s):  
Y. Kang ◽  
Y. Rong ◽  
J. A. Yang
Keyword(s):  
Fixture Design ◽  
Design Verification ◽  
Modular Fixtures ◽  
Computer Aided ◽  
Kinematic Models

Computer-aided fixture design (CAFD) techniques have been advanced rapidly that fixture configurations can be generated automatically, for both modular fixtures and dedicated fixtures. Computer-aided fixture design verification (CAFDV) is the technique for verifying and improving existing fixture designs. In this paper, the framework of CAFDV is introduced with two based on two models, geometric and kinematic models. The fixturing tolerance and stability verification will be presented in separated papers.

Locating error analysis and tolerance assignment for computer-aided fixture design

2001 ◽  
Vol 39 (15) ◽  
pp. 3529-3545 ◽  
Author(s):  
Y. Rong ◽  
W. Hu ◽  
Y. Kang ◽  
Y. Zhang ◽  
David W. Yen
Keyword(s):  
Error Analysis ◽  
Fixture Design ◽  
Locating Error ◽  
Computer Aided ◽  
Tolerance Assignment

Computer-aided Fixture Design Verification

2005 ◽  
pp. 211-258 ◽  
Author(s):  
Yiming (Kevin) Rong ◽  
Samuel H. Huang ◽  
Zhikun Hou
Keyword(s):  
Fixture Design ◽  
Design Verification ◽  
Computer Aided

A Deterministic Method of Application Region of Clamping Forces for Fixture Design

2011 ◽  
Vol 697-698 ◽  
pp. 345-348
Author(s):  
X.Y. Guo ◽  
Guo Hua Qin ◽  
Hai Chao Ye
Keyword(s):  
Screw Theory ◽  
Deterministic Algorithm ◽  
Fixture Design ◽  
Clamping Force ◽  
Discretization Method ◽  
Deterministic Method ◽  
Analysis Algorithm ◽  
Production Safety ◽  
Workpiece Stability

After being located, cutting force and torques will exert on a workpiece during the machining operation. In order to guarantee the location accuracy and production safety, the feasible clamping forces must be planned to stabilize the workpiece in the entire processing. Therefore, the workpiece stability is taken as a core to create a deterministic algorithm to the application region of clamping forces for the complex workpiece. Firstly, on the basis of the combination of the screw theory with the linear programming technology, an analysis algorithm is subjected to judge the workpiece stability. Secondly, according to the surface discretization method, a deterministic algorithm is further established to plan the application region of clamping force by analyzing the workpiece stability at all nodes in sequence. The proposed method can be utilized for the determination of the application region of clamping forces as well as the verification of the feasibility of the magnitudes of clamping forces.

scholarly journals Computer‐aided fixture design verification

2002 ◽  
Vol 22 (4) ◽  
pp. 350-359 ◽  
Author(s):  
Y. Kang ◽  
Y. Rong ◽  
J. Yang ◽  
W. Ma
Keyword(s):  
Fixture Design ◽  
Design Verification ◽  
Computer Aided

Machining Accuracy Analysis for Computer-aided Fixture Design Verification

1996 ◽  
Vol 118 (3) ◽  
pp. 289-300 ◽  
Author(s):  
Y. Rong ◽  
Y. Bai
Keyword(s):  
Manufacturing Systems ◽  
Cnc Machine Tools ◽  
Machining Accuracy ◽  
Fixture Design ◽  
Accuracy Analysis ◽  
Design Verification ◽  
Cnc Machine ◽  
Machining Processes ◽  
Machining Errors ◽  
Computer Aided

This paper presents a machining accuracy analysis for computer-aided fixture design verification. While discussing the utilization of CNC machine tools and machining centers, machining errors are described in terms of deterministic and random components and analyzed on the bases of their sources, where high machining accuracy and multi-operation under a single setup become major characteristics of manufacturing systems. In machining processes, a resultant dimension may be generated in terms of several relevant dimensions. The dependency of variation among these dimensions is examined and the relationships of locating datum and machining surfaces are analyzed. Variation among linear and angular dimensions are considered. Five basic models of dimension variation relationships are proposed to estimate the machining error, where different formulas of resultant dimension variation are given for different combinations of variation among relevant dimensions. A datum-machining surface relationship graph (DMG) is developed to represent the dependent relationships. A matrix-based reasoning algorithm is designed to search for the shortest path in the DMG. Once the relationship between a specified pair of surfaces is identified, different models of corresponding relationships may be utilized to estimate the possible machining errors which can be used to compare the fixturing accuracy requirement.

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