Interactive Design-Assistance System of Machine Tool Structure in Conceptual and Fundamental Design Stage

2010 ◽  
Vol 4 (3) ◽  
pp. 303-311 ◽  
Author(s):  
Zhangyong Yu ◽  
◽  
Keiichi Nakamoto ◽  
Tohru Ishida ◽  
Yoshimi Takeuchi
Keyword(s):  
Machine Tool ◽  
Beam Theory ◽  
Interactive Design ◽  
Assistance System ◽  
Design Stage ◽  
Beam Structure ◽  
Actual Structure ◽  
Machine Tool Structure ◽  
Short Time ◽  
Fundamental Design

This paper presents the development of an interactive design-assistance system for quickly determining a machine tool structure in conceptual and fundamental design stage. The distinguishing point in this system is that all components of one machine tool structure are approximated into conceptual beams. Therefore, by using the interactive design-assistance system, designers can decide a beam structure in a short time because classical beam theory makes it easy to analyze the static, dynamic and thermal stiffness. Converting the beam structure to an actual structure, designers can complete the conceptual and fundamental design of a machine tool structure. Consequently, the interactive design-assistance system enables designers to complete structural design of a machine tool in a shorter time with higher efficiency.

Modelling, Identification and Control of Thermal Deformation of Machine Tool Structures, Part 2: Generalized Transfer Functions

1998 ◽  
Vol 120 (3) ◽  
pp. 632-639 ◽  
Author(s):  
S. Fraser ◽  
M. H. Attia ◽  
M. O. M. Osman
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Real Time ◽  
Thermal Deformation ◽  
Transfer Functions ◽  
Design Stage ◽  
Machining Accuracy ◽  
Deformation Problem ◽  
Machine Tool Structure ◽  
Machine Tool Structures

With the ever increasing demand for higher machining accuracy at lower cost, thermal deformation of machine tool structures has to be minimized at the design stage, and compensated for during operation. To compensate for this type of error, two real-time process models are required to identify the magnitude of the transient thermal load and to estimate the relative thermal displacement between the tool and the work piece. Special considerations should be given to the solution of the first ill-posed inverse heat conduction model IHCP. In this paper, the concept of generalized modelling is extended to the thermal deformation problem. The results of this analysis is used to develop expressions for the generalized transfer functions of the thermal, and thermal deformation response of the machine tool structure. These transfer functions are the basic building blocks for real-time solution of the IHCP and then the deformation problem. The latter acts as a feed-back signal to the control system. Finite element simulation of the temperature field and the thermal deformation of a machine tool structure confirmed that the generalized transfer function approach can reproduce the accuracy of the finite element model but two orders of magnitude faster.

Development of an Interactive Assistance System for Machine Tool Structure Design Considering of Sliding Joint Damping

2011 ◽  
Vol 5 (5) ◽  
pp. 722-728 ◽  
Author(s):  
Zhangyong Yu ◽  
◽  
Keiichi Nakamoto ◽  
Yoshimi Takeuchi
Keyword(s):  
Machine Tool ◽  
Degrees Of Freedom ◽  
Structure Design ◽  
Assistance System ◽  
Static Stiffness ◽  
Dynamic Behaviors ◽  
Design Engineers ◽  
Joint Damping ◽  
Sliding Joint ◽  
Short Time

This paper deals with the development of an interactive design assistance system for machine tool structures. This system supports design engineers determining the suitable machine prototype in the conceptual and fundamental stages in a short time. In this study, all of the machine components are approximated by a set of beam elements to reduce the Degrees Of Freedom (DOF). Thus, it is easy to model and analyze the static stiffness and dynamic behaviors of the machine prototypes, especially in terms of sliding joint damping. By comparing their static stiffness and dynamic behaviors, design engineers can select the proper machine prototype in a short time. A case study shows the process, including the proposal, modeling, analysis, and selection, to determine the suitable machine prototype. This helps the design engineers to make the machine tool structural design efficiently.

scholarly journals Design and optimized analysis of high speed precise machine tool spindles

2021 ◽  
Vol 12 (2) ◽  
pp. 2965-2977
Author(s):  
Jeevan Raju B, Et. al.
Keyword(s):  
Machine Tool ◽  
Frequency Response ◽  
High Speed ◽  
Beam Theory ◽  
Design Stage ◽  
Stability Lobe ◽  
Precise Machine ◽  
Parameter Values ◽  
Stability Lobe Diagrams ◽  
Bearing System

Upcoming machine tools need to be extremely efficient systems to maintain the needed intellectual performance and stability. The spindle tool system is necessary to optimize which enhances the rigidity of the spindle and in turn produces the cutting stability with higher productivity. Prediction of the dynamic behavior at spindle tool tip is therefore an important criterion for assessing the machining stability of a machine tool at design stage. In this work, a realistic dynamic high-speed spindle /milling tool holder/ tool system model is elaborated on the basis of rotor dynamics predictions. The integrated spindle tool system in analyzed with the Timoshenko beam theory by including the effects of shear and rotary deformation effects. Using the frequency response at the tool tip the corresponding stability lobe diagrams are plotted for the vertical end mill system. Furthermore an optimization study is carried out at design stage for the bearing system and the rotor positions for maximizing the chatter vibration free cutting operation at the desired depth of cuts with precise rotational speeds.It is markedly found that the first mode of vibration had a large impact on the dynamic stability of the system. The parametric studies are conducted such as tool overhang and bearing span and the influence of these on the system dynamics are identified and the corresponding stability lobe diagrams are plotted. It is evidently found that the second mode of the frequency response has critically affected the bearing span and competing lobes are identified. These results are assisted to design a spindle bearing system at the desired machining conditions. A neural network based observer is designed based on the simulation resultsto predict optimum design parameter values.

Product Modeling, Evaluation and Validation at the Detailed Design Stage

2011 ◽  
Author(s):  
Cristian Iorga ◽  
Alain Desrochers
Keyword(s):  
Product Development ◽  
Design Process ◽  
Design Stage ◽  
Product Modeling ◽  
Specific Product ◽  
Development Processes ◽  
Product Variation ◽  
Process Methodology ◽  
Capstone Projects ◽  
Short Time

The expansion of the markets corroborated with product customization and short time to launch the product have led to new levels of competition among product development companies. To be successful in the globalization of the markets and to enable the evaluation and validation of products, companies have to develop methodologies focused on lifecycle analysis and reduction of product variation to obtain both quality and robustness of products. Keywords: Modeling, Evaluation, Validation, Design ProcessThis paper proposes a new design process methodology that unifies theoretical results of modeling stage and empirical findings obtained from the validation stage. The evaluations and validations of engineering design are very important and they have a high influence on product performances and their functionality, as well on the customer perceptions.Given that most companies maintain the confidentiality of their product development processes and that the existing literature does not provide more detailed aspects of this field, the proposed methodology will represent a technical and logistical support intended for students or engineers involved in academic as well as industrial projects.A generic methodology will be refined based on a new approach that will take into consideration the specification types (quantitative or qualitative), the design objectives and the product types: new/improved, structural/esthetic. Hence the new generic methodology will be composed of specific product validation algorithms taking into account the above considerations. At the end of this paper, the improvements provided by the proposed methodology into the design process will be shown in the context of the engineering student capstone projects at the Université de Sherbrooke.

Mathematical Model for the Influence of Machine Tool Parts Deformation on Machining Accuracy

2014 ◽  
Vol 556-562 ◽  
pp. 1354-1357
Author(s):  
Li Gong Cui ◽  
Gui Qiang Liang ◽  
Fang Shao
Keyword(s):  
Mathematical Model ◽  
Mathematical Method ◽  
Machine Tool ◽  
Cutting Tool ◽  
Lower Surface ◽  
Design Stage ◽  
Machining Accuracy ◽  
Cutting Point ◽  
The Mathematical Model

This paper presents a mathematical method to analyze the influence of each machine tool part deformation on the machining accuracy. Taking a 3-axis machine tool as an example, this paper divides the machine tool into the cutting tool sub-system and workpiece sub-system. Taking the deformation of lower surface of the machine bed as the research target, the mathematical model of the deformation on the displacement of the cutting point was established. In order to distribute the stiffness of each part, the contribution degree of each part on the machining accuracy was analyzed. Using this mathematical model, the stiffness of each part can be distributed at the design stage of the machine tool, and the machining accuracy of the machine tool can be improved economically.

A Stochastic Approach to Characterization of Machine Tool System Dynamics Under Actual Working Conditions

1976 ◽  
Vol 98 (2) ◽  
pp. 614-619 ◽  
Author(s):  
F. A. Burney ◽  
S. M. Pandit ◽  
S. M. Wu
Keyword(s):  
Machine Tool ◽  
Working Conditions ◽  
Stochastic Approach ◽  
Relative Displacement ◽  
Process Dynamics ◽  
Actual Working ◽  
Machine Tool Structure ◽  
Vertical Milling ◽  
Vertical Milling Machine ◽  
Tool Dynamics

The machine tool dynamics is evaluated under actual working conditions by using a time series technique. This technique develops mathematical models from only one signal, viz., the relative displacement between the cutter and the workpiece. Analysis of the experimental data collected on a vertical milling machine indicates that the new methodology is capable of characterizing the machine tool structure and the cutting process dynamics separately. Furthermore, it can also detect and quantify the interaction between these two subsystems.

Sign in / Sign up

Export Citation Format

Share Document