A study of the impact of machine tool structure on machining processes

Chanal, Hélène; Duc, Emmanuel; Ray, Priyadip

doi:10.1016/j.ijmachtools.2005.05.004

Cited by 70 publications

(45 citation statements)

References 14 publications

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“…Effective workspace is defined as the workspace which have good conditioning and is suitable for machining tasks [32]. Conditioning index will be employed in this paper as one measure to evaluate the effectiveness of the workspace of the PKM in terms of velocity, statics and accuracy, as most literatures did [11][12][13][14][15][16]20].…”

Section: Dimensional Optimizationmentioning

confidence: 99%

Optimal Design of a New Parallel Kinematic Machine for Large Volume Machining

Jin

Higgins

et al. 2012

Advances in Reconfigurable Mechanisms and Robots I

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Although numerous PKM topologies have been invented recently, few of them have been successfully put into production. A good topology can only provide good performance unless its geometrical parameters are optimized. This paper studies the dimensional synthesis of a new PKM which has shown great potential for large volume high performance manufacturing. A new optimization approach is proposed for design optimization, with a new performance index composed of weight factors of both Global Conditioning Index (GCI) and actuator stroke. Maximizing GCI will ensure the effectiveness of the workspace, while minimizing actuator stroke leads to reduced machine cost and increased efficiency. Results show that the proposed optimization method is valid and effective. The PKM with optimized dimensions has a large workspace to footprint ratio and a large wellconditioned workspace, which ensures its suitability for large volume machining.

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Section: Dimensional Optimizationmentioning

confidence: 99%

Optimal Design of a New Parallel Kinematic Machine for Large Volume Machining

Jin

Higgins

et al. 2012

Advances in Reconfigurable Mechanisms and Robots I

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“…As an important complement of traditional 5-DoF numerical control machines with serial topology structures, the parallel kinematic machines (PKMs) with closed topology structures have several advantages in terms of high stiffness, good accuracy/dynamic performance, large load-weight ratio and easy integration with long guideways [5][6][7]. Those have been proved by successful applications of famous Tricept [8][9][10] and Sprint Z3 head [11][12] PKMs, not only in the aerospace machining but also in fields like automobile and aviation assembling, wielding, drilling.…”

Section: Introductionmentioning

confidence: 99%

Stiffness analysis and experiment of a novel 5-DoF parallel kinematic machine considering gravitational effects

Lian

Sun

Song

et al. 2015

International Journal of Machine Tools and Manufacture

115

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a b s t r a c tIn order to carry out high-precision machining of aerospace structural components with large size, thin wall and complex surface, this paper proposes a novel parallel kinematic machine (PKM) and formulates its semi-analytical theoretical stiffness model considering gravitational effects that is verified by stiffness experiments. From the viewpoint of topology structure, the novel PKM consists of two substructures in terms of the redundant and overconstrained parallel mechanisms that are connected by two interlinked revolute joints. The theoretical stiffness model of the novel PKM is established based upon the virtual work principle and deformation superposition principle after mapping the stiffness models of substructures from joint space to operated space by Jacobian matrices and considering the deformation contributions of interlinked revolute joints to two substructures. Meanwhile, the component gravities are treated as external payloads exerting on the end reference point of the novel PKM resorting to static equivalence principle. This approach is proved by comparing the theoretical stiffness values with experimental stiffness values in the same configurations, which also indicates equivalent gravity can be employed to describe the actual distributed gravities in an acceptable accuracy manner. Finally, on the basis of the verified theoretical stiffness model, the stiffness distributions of the novel PKM are illustrated and the contributions of component gravities to the stiffness of the novel PKM are discussed.

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“…Therefore, according to the task constraints, parallel structure machines can bring benefit in term of task quality (cost, time, accuracy, ...) [14] [15]. However, the complexity of associated models and control laws, in addition to a reduced workspace, are their main drawbacks [19].…”

Section: Introductionmentioning

confidence: 99%

Enhancing control robustness of a 6 DOF parallel testing machine

Flohic

Paccot

Chanal

2014

2014 European Control Conference (ECC)

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For the first time, a Nooru-Mohammed test was realized using a new kind of loading machine based on gough platform. However, it has been shown that boundary conditions on the concrete specimen are not respected. As a consequence, a new control strategy needs to be developed. This paper aims at applying a well-known control loop based on hybrid force/position law to a loading application. This new control algorithm has been developed according to the task and the structure specificities. Indeed, it permits to realize multi-axial test where the boundary conditions are controlled and respected by using the extra degrees of freedom.

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A study of the impact of machine tool structure on machining processes

Cited by 70 publications

References 14 publications

Optimal Design of a New Parallel Kinematic Machine for Large Volume Machining

Optimal Design of a New Parallel Kinematic Machine for Large Volume Machining

Stiffness analysis and experiment of a novel 5-DoF parallel kinematic machine considering gravitational effects

Enhancing control robustness of a 6 DOF parallel testing machine

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