A Variational Method of Robust Fixture Configuration Design for 3-D Workpieces

Cai, Wayne; Hu, S. Jack; Yuan, Jinwei

doi:10.1115/1.2831192

Cited by 181 publications

(78 citation statements)

References 22 publications

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“…They also derived the condition for attachability and detachability of the workpiece within a fixture. Cai et al (1997) used a variational method for achieving robust fixture configuration. A non linear programming method was used with an objective of minimizing the positional error of the workpiece resulting from source errors at the locators.…”

Section: Introductionmentioning

confidence: 99%

Optimization of machining fixture layout for tolerance requirements under the influence of locating errors

Vishnupriyan¹,

Majumder²,

Ramachandran³

2010

Int. J. Eng. Sci. Tech

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Dimensional accuracy of workpart under machining is strongly influenced by the layout of the fixturing elements like locators and clamps. Setup or geometrical errors in locators result in overall machining error of the feature under consideration. Therefore it is necessary to ensure that the layout is optimized for the desired machining tolerance for a given deviation in the set up or geometry of the locator. Also, the locator layout should be capable of holding the workpart in a unique position during machining thus providing deterministic location. This paper proposes a Genetic Algorithm (GA) based optimization method to arrive at a layout of error containing locators for minimum machining error satisfying the tolerance requirements and providing deterministic location. A three dimensional workpiece under the 3-2-1 locating scheme is studied. Results indicate that by optimally placing the error containing locators the geometric error component of the machining error can be substantially reduced thus enabling compliance to overall dimensional requirements.

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Section: Introductionmentioning

confidence: 99%

Optimization of machining fixture layout for tolerance requirements under the influence of locating errors

Vishnupriyan¹,

Majumder²,

Ramachandran³

2010

Int. J. Eng. Sci. Tech

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“…Weill et al [12] analyzed workpiece locating variations, where the "function comparison method," an optimization method for discrete variables, was employed to choose the best locating set-up from randomly selected locating candidates. Cai et al [13] developed a variational method for robust fixture configuration design to minimize workpiece locating variations due to source variations such as workpiece/fixture surface form variations and locator setup variations. An optimal locating configuration could be found from among an infinite number of feasible locating schemes that can ensure deterministic locating and total fixturing conditions.…”

Section: Introductionmentioning

confidence: 99%

Robust pin layout design for sheet-panel locating

Cai

2005

Int J Adv Manuf Technol

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Sheet panels, represented as freeform surfaces in a CAD system, are widely used in manufacturing processes. Locating blocks and pins, collectively known as locators, are the most common fixtures for the joining and assembly of sheet panels. In this paper, a robust design approach is utilized to optimize the pin layout so that the sheet panel variations, expressed as translational and orientational variations at certain key product/process characteristic points (KPCs), are minimized. The advantage of this approach is that the locating variations at any given point on the panel can be obtained quantitatively, and hence, the optimal pin design can be selected from among an infinite set of feasible designs. Based on the analyses, some useful pin design guidelines will also be proposed.

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“…Ball screw thread is incorporated for easy alteration in the outside diameter of the fixture. [4] The prototype to be produced of Mild Steel 25HRC. The fixture is designed and analysed with two different center distances of 350mm and 550mm respectively.…”

Section: Designmentioning

confidence: 99%

Design and Analysis of Split Fixture for Gear Hobbing Machine

Shenoy¹,

Naik²,

Shettar³

et al. 2018

MATEC Web Conf.

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Abstract. Compared to the conventional gear hobbing fixtures, split fixture can effectively reduce job set-up time during the manufacturing process. This paper investigates the behaviour and analysis of split fixture under varying static loading conditions. Design of the part was established by considering the ability of the split fixture to carry jobs of various diameters. In order to validate the design, Static structural analysis was carried out on two positional configurations of the split fixture. A load of 1 ton was applied on the resting face of the fixture to simulate the effect of holding the job. The analysis included a study of the Stress, Deformations, and Modal analysis at different resonating frequencies to check for failure of design. By applying varying loads similar to practical conditions, it was observed that the design successfully withstood the applied forces without failure and a factor of safety of 142 was achieved in a critical loading case. Investigating the effect of dynamic loads on the Split Fixture and including auxiliary assembly components in design analysis.

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A Variational Method of Robust Fixture Configuration Design for 3-D Workpieces

Cited by 181 publications

References 22 publications

Optimization of machining fixture layout for tolerance requirements under the influence of locating errors

Optimization of machining fixture layout for tolerance requirements under the influence of locating errors

Robust pin layout design for sheet-panel locating

Design and Analysis of Split Fixture for Gear Hobbing Machine

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