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

2009 ◽  
Author(s):  
Guohua Qin ◽  
Dong Lu ◽  
Shiping Sun
Keyword(s):  
Fixture Design ◽  
Clamping Force ◽  
Force Optimization

Iterative Fixture Layout and Clamping Force Optimization Using the Genetic Algorithm

2001 ◽  
Vol 124 (1) ◽  
pp. 119-125 ◽  
Author(s):  
Krishnakumar Kulankara ◽  
Srinath Satyanarayana ◽  
Shreyes N. Melkote
Keyword(s):  
Genetic Algorithm ◽  
Nonlinear Programming ◽  
Primary Objective ◽  
Fixture Design ◽  
Clamping Force ◽  
Optimal Solutions ◽  
Fixture Layout ◽  
Force Optimization ◽  
Nonlinear Programming Methods ◽  
Objective Being

Fixture design is a critical step in machining. An important aspect of fixture design is the optimization of the fixture, the primary objective being the minimization of workpiece deflection by suitably varying the layout of fixture elements and the clamping forces. Previous methods for fixture design optimization have treated fixture layout and clamping force optimization independently and/or used nonlinear programming methods that yield sub-optimal solutions. This paper deals with application of the genetic algorithm (GA) for fixture layout and clamping force optimization for a compliant workpiece. An iterative algorithm that minimizes the workpiece elastic deformation for the entire cutting process by alternatively varying the fixture layout and clamping force is proposed. It is shown via an example of milling fixture design that this algorithm yields a design that is superior to the result obtained from either fixture layout or clamping force optimization alone.

Iterative Fixture Layout and Clamping Force Optimization Using the Genetic Algorithm

2000 ◽  
Author(s):  
Krishnakumar Kulankara ◽  
Srinath Satyanarayana ◽  
Shreyes N. Melkote
Keyword(s):  
Genetic Algorithm ◽  
Nonlinear Programming ◽  
Primary Objective ◽  
Fixture Design ◽  
Clamping Force ◽  
Optimal Solutions ◽  
Fixture Layout ◽  
Force Optimization ◽  
Nonlinear Programming Methods ◽  
Objective Being

Abstract Fixture design is a critical step in machining. An important aspect of fixture design is the optimization of the fixture, the primary objective being the minimization of workpiece deflection by suitably varying the layout of fixture elements and the clamping forces. Previous methods for fixture design optimization have treated fixture layout and clamping force optimization independently and/or used nonlinear programming methods that yield sub-optimal solutions. This paper deals with application of the genetic algorithm (GA) for fixture layout and clamping force optimization for a compliant workpiece. An iterative algorithm that minimizes the workpiece elastic deformation for the entire cutting process by alternatively varying the fixture layout and clamping force is proposed. It is shown via an example of milling fixture design that this algorithm yields a design that is superior to the result obtained from either fixture layout or clamping force optimization alone.

One Fast Fixture Layout and Clamping Force Optimization Method Based on Finite Element Method

2012 ◽  
Author(s):  
Zhihui Liu ◽  
Michael Yu Wang ◽  
Kedian Wang ◽  
Xuesong Mei ◽  
Guo Hua
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimization Algorithm ◽  
Computing Time ◽  
Optimization Method ◽  
Clamping Force ◽  
Optimal Method ◽  
Fixture Layout ◽  
Force Optimization ◽  
Element Method

Aimed to reduce the deformation of workpiece-fixture system, one fixture layout and clamping force optimal method is constructed in this paper. Firstly, system stiffness matrix is built by Finite Element Method (FEM), and one matrix size reducing method is proposed to avoid the high computing time cost of solving FEM balance equation. Secondly, one clamping force optimization method which should be called after fixture layout is generated during every step of optimization algorithm is presented to lessen calling times of FEM solving process and save running time. And then based on these, one fixture layout and clamping force optimization algorithm is constructed using genetic algorithm (GA). At the end of this paper, numeral examples are taken to verify the validity and usability of the methods.

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.

scholarly journals PERANCANGAN ULANG MACHINING FIXTURE UNTUK PRODUK CYLINDER HEAD DAN COVER CRANKCASE TIPE 168

2020 ◽  
Vol 6 (1) ◽  
pp. 1-7
Author(s):  
Asep Indra Komara
Keyword(s):  
Production Process ◽  
Cylinder Head ◽  
Design Method ◽  
Work Productivity ◽  
Machining Process ◽  
Process Time ◽  
Fixture Design ◽  
Clamping Force ◽  
Engineering Software ◽  
Engine Components

The cylinder head and crankcase cover are components of an engine produced by a manufacturing company in Tangerang. Companies need to make improvements to the production process of these components in order to compete with their competitors. The improvement of the production process is done by improving the machining process stages and re-designing the engine product fixture. Actually the company already has a fixture for the engine machining process, but the fixture cannot be used to produce engine components because it still does not function properly. The problem that occurs is the deviation of the dimensions of machining results and the ineffectiveness of the machining process thereby reducing work productivity. Therefore, it is necessary to design a new fixture that is able to answer both of these problems. Fixture design through the application of the VDI 2222 method combined with the design method according to the Handbook of Jig Fixture has resulted in a fixture design and estimated new machining process time for engine components. The fixture design is then analyzed and validated using engineering software to ensure the fixture's rigidity of the clamping force, machining force, and deflection that occur during the machining process which can have an impact on dimensional deviations. Based on the results of the study conducted, a fixture design for machining cylinder head and crankcase cover products has been produced with fixture dimensions of 450 x 459 x 1125 with a weight of 190 kg. The time needed to complete the cylinder head product is 308.67 seconds and the crankcase cover is 224.19 seconds. The maximum clamping force required is 0.36 kN. Deflection that occurs in the clamping rod is 0.0048 mm, the fixture frame is 0.029 mm and the product deformation is 0.06 mm. The fixture design is expected to be able to solve the problems that exist in the company today.

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.

The Methodical Procedure for Designing of Clamping Jaws

2014 ◽  
Vol 693 ◽  
pp. 44-49
Author(s):  
Jarmila Oravcova
Keyword(s):  
Cutting Force ◽  
Design Methodology ◽  
Model Simulation ◽  
Design Procedure ◽  
Fixture Design ◽  
Clamping Force ◽  
Design Verification ◽  
Position Change ◽  
Ansys Simulation ◽  
Three Stages

The paper deals with the clamping fixture jaws procedure design. The clamping jaw design methodology developed summarizes complex factors. These factors affect the clamping jaws design for the workpiece. Methodical design procedure consists of three stages. Namely, there are input date summary, clamping fixture design and the last design verification. The ANSYS simulation was used for the verification developing methodology. The components model simulation aim has been studied impact of clamping force position change to the cutting force reactions change. Research was conducted with different positions of jaws.

Clamping Force Evaluation For A Robotic Catheter Navigation System

2013 ◽  
Vol 666 (666) ◽  
pp. 1-5 ◽  
Author(s):  
Nan Xiao ◽  
Baofeng Gao ◽  
Liwei Shi ◽  
Zhibin Song ◽  
Shuxiang Guo ◽  
...  
Keyword(s):  
Navigation System ◽  
Clamping Force ◽  
Catheter Navigation

Leakage characteristics of flanged pipe joints

1977 ◽  
Vol 12 (1) ◽  
pp. 29-36 ◽  
Author(s):  
H Fessler ◽  
D A Perry
Keyword(s):  
Surface Finish ◽  
Joint Surface ◽  
Clamping Force ◽  
Face Surface ◽  
Joint Efficiency ◽  
Wide Range ◽  
Pipe Joints ◽  
Surface Profiles ◽  
Leakage Characteristics ◽  
Gasket Material

Standard flanges for five widely differing pressure ratings, having a wide range of different joint surface profiles, were sealed by flat rubber or asbestos gaskets. Different initial bolt tensions were applied and the variation of clamping force with internal pressure was measured up to leakage of the joint. The joint efficiency, defined as: (end thrust due to leakage pressure on bore area of pipe)/(total initial bolting force), is not affected by variations in joint-face surface finish if machining grooves across the joint surface are avoided. Minimum values of joint efficiency are given. The effects of gasket material, width and thickness and number of bolts on joint efficiency are considered.

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