PRECISION MEASURES FOR VARIOUS CONFIGURATIONS OF PARALLEL KINEMATIC MACHINE TOOLS

2002 ◽  
Vol 38 (09) ◽  
pp. 101 ◽  
Author(s):  
Tiemin Li
Keyword(s):  
Machine Tools ◽  
Parallel Kinematic Machine ◽  
Parallel Kinematic ◽  
Parallel Kinematic Machine Tools

Efficient Simulation of Parallel Kinematic Machine Tools

2009 ◽  
Author(s):  
Martin Kipfmu¨ller ◽  
Christian Munzinger
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Development Process ◽  
Special Focus ◽  
Full Potential ◽  
Parallel Kinematic Machine ◽  
Machine Tool Industry ◽  
Simulation Tools ◽  
Parallel Kinematic ◽  
Parallel Kinematic Machine Tools

Today’s machine tool industry mainly consists of small and medium-sized enterprises. Thus, the simulation of new products often does not seem to be cost effective due to the small number of items produced and the high cost of simulation tools. Nevertheless, the use of simulation tools is essential in order to tap the full potential of new challenging concepts like parallel kinematic machines. This paper presents a simulation method supporting the development process of parallel kinematic machine tools from the first concept to the prototype. In order to render the method applicable for the machine tool industry, a special focus is placed on tool efficiency. A modular modeling concept will ensure that the structure of the first kinematic model of the concept phase can be enhanced during the development process and developed into more detailed models, e.g. for dimensioning calculations or to study the dynamic behavior of machine tools. Thus, the method efficiently supports the whole development process with a simulation model gradually increasing in detail according to the requirements of the machine tool designer.

Theoretical Design and Control Analysis of Reconfigurable Parallel Kinematic Machine Tools

2007 ◽  
Author(s):  
Dan Zhang ◽  
Zhuming Bi ◽  
Yunjian Ge
Keyword(s):  
Machine Tools ◽  
Geometric Modeling ◽  
General Concept ◽  
Control Analysis ◽  
Parallel Kinematic Machine ◽  
Modeling And Control ◽  
Theoretical Design ◽  
Parallel Kinematic ◽  
And Control ◽  
Parallel Kinematic Machine Tools

This paper introduces the theoretical design and control of reconfigurable parallel kinematic machine tools. First, the general concept of reconfigurable parallel kinematic machine (RPKM) and its growing demand are introduced. Second, the design of reconfigurable parallel kinematic machines is discussed and the geometric modeling of such structures is presented and explained. The potential applications of this type of machine are described. Finally, a case study for one of the proposed structures is conducted, including kinematic/dynamic modeling and control, some results and simulation are demonstrated.

Stiffness Computation and Identification of Parallel Kinematic Machine Tools

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Thomas Bonnemains ◽  
Hélène Chanal ◽  
Belhassen-Chedli Bouzgarrou ◽  
Pascal Ray
Keyword(s):  
Machine Tools ◽  
Model Identification ◽  
Parallel Kinematic Machine ◽  
Constant Stiffness ◽  
Proposed Model ◽  
Machined Parts ◽  
Parallel Kinematic ◽  
Machining Operations ◽  
Machining Strategies ◽  
Parallel Kinematic Machine Tools

This paper deals with the stiffness computation and model identification of parallel kinematic machine tools (PKMs). Due to their high dynamic abilities, PKMs are subjected to high inertial and cutting loads while machining. These loads generate structure deflection, and it results in a low level of accuracy compared with serial machines. The aim of this paper is to present a “compact” and predictable model of PKM. This model could be useful to optimize part positioning in the workspace or adapt machining strategies in order to minimize the influence of structure deflections. The proposed model takes into account legs’ and joints’ compliances. Considering the geometry of most of parallel architectures, the legs are modeled as beams. The focus, here, is particularly on joints’ models. In literature, when the compliance of joints is considered, it is most of the time modeled with a constant stiffness. In this paper, a different approach is proposed, based on a technical analysis of the joints. Models proposed are applied to an existing PKM: the Tricept. The parameters of this model (i.e., the stiffness of the joints) are then identified; thanks to experimental stiffness measurements done on an ABB 940 Tricept robot. This robot is used in the industry for machining operations, such as grinding or drilling. A discussion about identifiable parameters is performed so as to best fit with experimental measurements. Finally, this model is used to define a static workspace where the machined parts are within the tolerances for a given operation.

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