Integration of Geometric and Mechanistic Models of NC Machining Into an Open-Architecture Machine Tool Controller

2000 ◽  
Author(s):  
Robert B. Jerard ◽  
Barry K. Fussell ◽  
Mustafa T. Ercan ◽  
Jeffrey G. Hemmett
Keyword(s):  
Machine Tool ◽  
Nc Machining ◽  
Cutting Process ◽  
Open Architecture ◽  
Mechanistic Models ◽  
Machining Processes ◽  
Modeling And Control ◽  
Feedrate Optimization ◽  
Novel Methods ◽  
And Control

Abstract A great deal of research has been done during the last twenty years on the modeling and control of NC machining. Despite the promise of substantial productivity improvements these methods are sparsely used outside their academic birthplaces. We believe that Open-Architecture Controllers (OAC) are the key to unlocking this unfulfilled potential. We describe the implementation of novel methods for feedrate optimization which utilize a commercially available OAC. In this paper an example is given of how substantial improvements in machining processes can be achieved by implementing geometric and mechanistic models of the cutting process on an OAC. These benefits should provide motivation for a more universal adoption of OACs.

Dynamic modeling and control design for a parallel-mechanism-based meso-milling machine tool

Robotica ◽  
2013 ◽  
Vol 32 (4) ◽  
pp. 515-532 ◽  
Author(s):  
Adam Y. Le ◽  
James K. Mills ◽  
Beno Benhabib
Keyword(s):  
Machine Tool ◽  
Dynamic Modeling ◽  
Design Methodology ◽  
Controller Design ◽  
Convex Combination ◽  
Control Design ◽  
Milling Machine ◽  
Modeling And Control ◽  
Kinematic Mechanisms ◽  
And Control

SUMMARYA novel rigid-body control design methodology for 6-degree-of-freedom (dof) parallel kinematic mechanisms (PKMs) is proposed. The synchronous control of PKM joints is addressed through a novel formulation of contour and lag errors. Robust performance as a control specification is addressed. A convex combination controller design approach is applied to address the problem of simultaneously satisfying multiple closed-loop specifications. The applied dynamic modeling approach allows the design methodology to be extended to 6-dof spatial PKMs. The methodology is applied to the design of a 6-dof PKM-based meso-milling machine tool and simulations are conducted.

Geometric Modeling and Five-Axis NC Machining for Centrifugal Impeller

2011 ◽  
Vol 314-316 ◽  
pp. 1556-1561 ◽  
Author(s):  
Jeng Nan Lee ◽  
Hung Shyong Chen ◽  
Huang Kuang Kung
Keyword(s):  
Machine Tool ◽  
Geometric Modeling ◽  
Nc Machining ◽  
Model Material ◽  
Machining Process ◽  
Centrifugal Impeller ◽  
Machining Processes ◽  
Design Concepts ◽  
Five Axis ◽  
Cam Software

As the blade surfaces of the centrifugal impeller are normally twisted in design to achieve the required performance, it can cause overcut and collision problems during machining. In order to comprehend the design concepts of impeller and create the capacity of the manufacture, the objectives of this paper are the regeneration of impeller profile and the studies of the five-axis NC machining. The geometry of the impeller is modeled according to the reverse engineering firstly. In the machining process, the flank cutting technique and the point cutting method are applied to rough and finish machining processes. Through the application of CAM software, the interference-free toolpath and the cutter location for five-axis NC machining are generated. To avoid collision between machine tool components, the generated toolpath is verified before actual machining through solid cutting simulation. It is also verified through the real cut with model material on a five-axis machine tool.

scholarly journals Development and Control of a 5-Axis Reconfigurable Machine Tool

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Z. M. Bi
Keyword(s):  
Control System ◽  
Machine Tool ◽  
Degrees Of Freedom ◽  
Open Architecture ◽  
Constant Length ◽  
Software Reconfiguration ◽  
Parallel Kinematic ◽  
And Control ◽  
Reconfigurable Machine Tool ◽  
Three Degrees Of Freedom

The development of a hybrid reconfigurable machine tool has been introduced. The machine tool consists of a tripod-based parallel kinematic machine (PKM) module with three degrees of freedom (DOF) and a serial linear table with two DOF. The PKM is installed on a gantry system which is capable of reconfiguring its position and orientation. In the design of tripod-based parallel mechanism, a passive link is used to enhance the stiffness and increase the working load. To avoid the buildup of the heat of the extensive actuation, three joints are actuated via the actuators with a constant length. The geometries of the PKM have been optimized for the best and highest accuracy. In this paper, its control system and the prototyping development are focused. An open architecture is applied, the control methodologies are developed and validated, and the corresponding software tools have been implemented for the software reconfiguration of the control system.

MODELING AND CONTROL OF DIMENSIONAL QUALITY OF A SERIAL MULTI-STATION MACHINING SYSTEM

2006 ◽  
Vol 13 (05) ◽  
pp. 399-419 ◽  
Author(s):  
SHICHANG DU ◽  
LIFENG XI ◽  
ERSHUN PAN ◽  
JIANJUN SHI ◽  
C. RICHARD LIU
Keyword(s):  
State Space ◽  
State Space Model ◽  
Machining Processes ◽  
Modeling And Control ◽  
Engineering Theory ◽  
Machining Errors ◽  
Proposed Model ◽  
Machining System ◽  
Linear State ◽  
And Control

Modeling and control of dimensional quality is one of deciding factors in current manufacturing competitions, and has always presented a great challenge to both scientists and engineers since for a multi-station machining system, the final product variation is an accumulation from all stations, and the complex non-linear relationship exits between dimensional quality and machining errors. This paper develops a linear state space model using homogeneous transformation to capture the influence of machined errors on dimensional quality, and the explicit expressions for system matrices of the model are explored. The proposed model employs a linear state space form, facilitating the use of the achievements of control theory, information technology and system engineering theory to support engineers supervisory control of physical machining processes, and it also can be used as an analytical engineering tool for efficient and effective faults diagnosis, system plan and design, and optimal sensors allocation. A real machining case illustrates the proposed model.

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