scholarly journals Optimal Structure Design Methodology for Compound Multiaxis Machine Tools - I - Analysis of Requirements and Specifications -

2007 ◽  
Vol 1 (2) ◽  
pp. 78-86 ◽  
Author(s):  
Masamitsu Nakaminami ◽  
◽  
Tsutomu Tokuma ◽  
Toshimichi Moriwaki ◽  
Keiichi Nakamoto ◽  
...  
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Structure Design ◽  
Machining Time ◽  
Systematic Analysis ◽  
Machining Center ◽  
Dedicated Machines ◽  
Jigs And Fixtures ◽  
Single Compound ◽  
Inclined Surface

The functionality of compound multiaxis machine tools is becoming increasingly versatile as NC lathes evolve. A single compound multiaxis machine tool functions as a 2-axis NC lathe and as a 5 axis machining center. The compound multiaxis machine tool executes machining such as inclined surface and gear cutting, conventionally executed by dedicated machines with special jigs and fixtures. A survey has shown that most machining executed by conventional compound multiaxis machine tools consists of basic drilling and milling on the orthogonal plane, indicating that compound multiaxis machine tools specifications should be designed to meet these requirements. To improve competitiveness and return investment over conventional NC lathes and machining centers, productivity required for a compound multiaxis machine tool is derived based on the machining time of typical parts on conventional machines. Here, we address systematic analysis and methodology to determine compound multiaxis machine tool specifications from the viewpoints of quality and cost.

Detektion von Bauteilfehlern aus Maschinendaten/Detection of workpiece flaws out of machine tool data – possibilities and limits

2019 ◽  
Vol 109 (11-12) ◽  
pp. 828-832
Author(s):  
M. Weigold ◽  
A. Fertig ◽  
C. Bauerdick
Keyword(s):  
Quality Assurance ◽  
Machine Tool ◽  
Machine Tools ◽  
Machining Time ◽  
Parallel Detection ◽  
High Data ◽  
Novel Approach ◽  
Data Rates ◽  
High Data Rates

Durch zunehmende Vernetzung und Digitalisierung von Werkzeugmaschinen und Automatisierungskomponenten ergibt sich die Möglichkeit, Signale mit hohen Datenraten und großer Vielfalt aufzuzeichnen. Der vorliegende Beitrag beschreibt erste Untersuchungen zur Realisierbarkeit einer prozessparallelen Detektion von Bauteilfehlern auf Basis interner Werkzeugmaschinendaten. Dabei werden Potenziale und Grenzen für diesen neuartigen Ansatz zur hauptzeitparallelen Qualitätssicherung aufgezeigt.   The increasing networking and digitization of machine tools and automation components provides the opportunity to record signals with high data rates and great diversity. This paper describes first investigations on the feasibility of a process-parallel detection of component defects on the basis of internal machine tool data. Potentials and limits for this novel approach to quality assurance parallel to machining time are presented.

Uncertain Parameters in Thermal Machine-Tool Models and Methods to Design their Metrological Adjustment Process

2015 ◽  
Vol 794 ◽  
pp. 379-386 ◽  
Author(s):  
Bernd Kauschinger ◽  
Steffen Schroeder
Keyword(s):  
Machine Tool ◽  
Design Process ◽  
Machine Tools ◽  
Expert Knowledge ◽  
Sufficient Accuracy ◽  
Adjustment Process ◽  
Uncertain Parameters ◽  
Systematic Analysis ◽  
Adjustment Procedure ◽  
Typical Design

The measures taken to improve the thermal behaviour of machine tools are based on thermal models. The models are applied to support the design process and to correct the machine tool operation in a control-based way. Especially the models for correction purposes include uncertain parameters that cannot be estimated with sufficient accuracy. Thus these parameters have to be adjusted by means of measurements. During the adjustment process, a broad diversity of machine behaviour and model characteristics has to be taken in to account. Therefore, substantial time, effort and expert knowledge are required. To identify the key expenses, a generalized and systematic analysis of the adjustment process was carried out. First, the typical design of the models, the parameters of the sub models and the current adjustment procedure were investigated. Based on the results of the analysis, support requirements were identified. Afterwards first methods and software tools for efficient support were developed. This strategy is demonstrated using the example of a hexapod strut model.

Dynamic Characteristics Analysis of Gantry Machining Center Structure

2013 ◽  
Vol 819 ◽  
pp. 24-28
Author(s):  
Yan Yun Tang ◽  
Ze Yu Weng ◽  
Li Ka Fang ◽  
Xiang Gao ◽  
Jian De Hu ◽  
...  
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Weak Link ◽  
Dynamic Performance ◽  
Modal Parameters ◽  
Machining Center ◽  
Characteristics Analysis ◽  
Relative Excitation ◽  
Dynamic Characteristics Analysis ◽  
Modern Machine

The dynamic performance of modern machine tools is more and more highly emphasized. The research purpose of this paper is to research dynamic performance of gantry machining center through modal experiment. In this paper, the theory of relative excitation test on the machine tool is expounded, and relative excitation test is carried on gantry machining center and then the modal parameters of this machine tool are obtained through experimental modal analysis. Analyze the weak link of this gantry machining center, show that the stiffness of Z direction of Z to feed component of this machine tool is insufficient and the stiffness of X, Y direction of ram is insufficient.

Design of Damped Structures to Increase Machine Tool Dynamical Performance

2018 ◽  
Author(s):  
Francesco Aggogeri ◽  
Alberto Borboni ◽  
Angelo Merlo ◽  
Nicola Pellegrini ◽  
Riccardo Adamini ◽  
...  
Keyword(s):  
Machine Tool ◽  
Hybrid Materials ◽  
High Speed ◽  
Material Selection ◽  
Dynamic Properties ◽  
Structure Design ◽  
Machining Time ◽  
Reinforced Plastic ◽  
Innovative Materials ◽  
And Performance

The demand of ultra-high precision (UHP) machining is growing word-wide, driving the study and development of new solutions to increase the machine tool (MT) functionalities and performance. This trend has generated a request of smart, flexible and faster MTs that are able to reduce machining time and improve the final accuracy. The material selection in MT structure design and building may play a fundamental role to satisfy the customer’s requirements. In addition, the application of innovative materials in today’s technology may solve many issues that affect the machining quality due to static, dynamic and thermal behaviors. This paper presents a set of hybrid materials that may be used to fabricate the moving parts of a machine tool. The proposed solutions aim to guarantee lightness, capacity to damp vibrations and high stiffness limiting static and dynamic issues. The study focuses on four types of hybrid materials: sandwich structures based on Aluminium Foam, in open and closed cells configuration, sandwich panels with a corrugated core and Carbon Fiber Reinforced Plastic (CFRP) materials. A number of prototypes (milling MT ram – z axis) has been designed, manufactured and tested for high speed applications, evaluating both static and dynamic properties and highlighting potential advantages, drawbacks and new opportunities respect to conventional materials (e.g. iron, steel).

Thermal Error Modeling of Machine Tools Based on M-RAN

2011 ◽  
Vol 121-126 ◽  
pp. 529-533
Author(s):  
Jian Han ◽  
Li Ping Wang ◽  
Ning Bo Cheng ◽  
Xu Wang
Keyword(s):  
Machine Tool ◽  
Eddy Current ◽  
Machine Tools ◽  
Thermal Error ◽  
Error Modeling ◽  
Test Results ◽  
Thermal Errors ◽  
Machining Center ◽  
Machining Errors ◽  
Minimal Resource

Thermal error in machine tools is one of the most significant causes of machining errors. This paper presents a new modeling method for machine tool error. Minimal-resource allocating networks (M-RAN) are used to establish the relationships between the temperature variables and thermal errors. Pt-100 thermal resistances and eddy current sensors are used to measure the temperature variables and the thermal errors respectively. A machining center is used to experiment. The test results show that method with minimal-resource allocating networks can predict the thermal errors of the machine accurately.

Double-Spindle Symmetrical Machining to Improve Machining Efficiency

2011 ◽  
Vol 403-408 ◽  
pp. 4367-4370
Author(s):  
Yan Zhao ◽  
Wen Bin Li ◽  
Hao Ran Liu ◽  
Jing Shao
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Turbine Rotor ◽  
Machining Accuracy ◽  
Machining Efficiency ◽  
Machining Center ◽  
Turbine Rotors ◽  
The Cost ◽  
New Machine

In order to improve the machining efficiency of the duralumin turbine rotor of maglev molecular pump, this paper proposes a new double-spindle horizontal milling machining center structure. Through a brief introduction to other types of machine tools, describes the characteristics of this new machine tool and symmetrical machining implementation. This paper proposes a new double-spindle horizontal milling machining centers so that the machining efficiency of duralumin turbine rotors is improve 100% more than that of the traditional machine tool in theory. Moreover, its machining accuracy get relative improve as the decrease of the dividing accumulative error. At the same time, the cost of workpiece is reduced greatly.

Dynamic Characteristics of a Machine Tool at Working Positions in Operating Test

2011 ◽  
Author(s):  
Huimin Dong ◽  
Yang Tan ◽  
Delun Wang ◽  
Yali Ma
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Machine Tools ◽  
Dynamic Properties ◽  
Vibration Energy ◽  
Testing Method ◽  
Spring Element ◽  
Machining Center ◽  
Brick Element ◽  
Stiffness And Damping

A machine tool is an assembly structure fitted by some moveable substructures, which the relative motion between the substructures creates normal and limit operating positions. Along with the substructures moving, the distributions of masses, stiffness and damping of the machine in space vary, leading to variety of structure distributions and dynamic properties. For exploring the dynamic properties distributions of machine tools, this paper presents a testing method under practical operational excitations, which is under operating excitations from remaining unbalanced value in the spindle, and collecting vibration signals of time and frequency at the spindle foreside at working positions. To identify resonance characteristics, a judging matrix is established by comparing vibration energy and vibration amplitude at 1st octave. By this method, MDH50 active pole horizontal machining center is tested, and the dynamic characteristics is determined. It reveals that dynamic characteristics of resonance come from the substructure independent resonance and their superposition in operating excitation. For verifying this result, FEA is conducted, in which 20 nodes brick element and spring element are applied to build the model entities and interfaces. The analysis result by FEM is consistent to the testing results. The research provides foundation for how setting up machining programs to avoid the resonance vibration of the machine in the operating.

Research on MFBD Modeling Method for a Gantry Machining Center Beam Components

2011 ◽  
Vol 188 ◽  
pp. 487-492 ◽  
Author(s):  
Q.J. Yang ◽  
D.N. Li ◽  
L.L. Kong ◽  
K. Li
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
High Speed ◽  
Modeling Method ◽  
Ball Screw ◽  
Machining Processes ◽  
Element Analysis ◽  
Machining Center ◽  
Body Dynamics ◽  
Multi Body

In modern machining processes, Gantry Machining Center is one of the most important machine tools. Moreover, beam components directly relate to the overall performance. From multi-body simulation (MBS) and finite element analysis (FEA) respectively, the paper discusses current state of the multi-body dynamics modelling of the machine tool components in domestic and overseas. In this paper, We adopt a method, the multi-flexible body dynamics(MFBD) modeling method for machine tool transmission components (linear guidance and ball screw drives) in software Recurdyn, to create the conditions for MFBD simulation analysis of the beam components system. Much more, it provides a way of MFBD modelling for machine tools components in both the high-speed and high-performance.

Modeling of Dynamic Errors for a Table-Tilting Type 5-Axis Machine Tools

2013 ◽  
Vol 655-657 ◽  
pp. 1277-1281
Author(s):  
Yong Chao Zhang ◽  
Song Lin Wu ◽  
Jun Feng Zhang
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Dynamic Error ◽  
Transformation Matrix ◽  
Rotary Table ◽  
Static Error ◽  
Machining Center ◽  
Error Dynamic ◽  
Homogeneous Transformation Matrix ◽  
Dynamic Errors

The precision of its processes is affected by static error and dynamic error. This paper focuses on modeling about dynamic errors and proposed an algorithm of the dynamic error for Table-tilting 5-axis machine tool, which is using Homogeneous Transformation Matrix to establish the dynamic errors formula, so as to structure a model of its dynamic error. Dynamic errors about rotary and linear axis of a 5-axis machining center with tilting rotary table type are defined. At last, we performed the operation and measurement of Table-tilting 5-axis machine, in order to compare and verify the dynamic errors, and to use as adjusting the Table-tilting 5-axis machine tool, and improve the precision of its machining. The result of a synthesis example verifies the effectiveness of the proposed modeling.

Structure Design of Precision Horizontal Machining Center and Multi-Objective Optimization of Large Structural Components

2013 ◽  
Vol 712-715 ◽  
pp. 1514-1518 ◽  
Author(s):  
Qing Yun ◽  
Wen Tie Niu ◽  
Jun Qiang Wang ◽  
Li Zhang
Keyword(s):  
Machine Tool ◽  
Optimization Method ◽  
Structure Design ◽  
Surface Model ◽  
Structural Components ◽  
Multi Objective Optimization ◽  
Technical Process ◽  
Multi Objective ◽  
Modeling Methods ◽  
Machining Center

This paper presents the technical process of machine tool design and multi-objective optimization of large structural components based on Pro/E and SAMCEF. The main contents include: the design process of the machine tool layout and the large structural components; finite element modeling methods of the fixed joint, screw-nut joint and guide-slider joint; the optimization method of large structural components based on response surface model. A precision horizontal machining center is used as an example to verify the correctness and feasibility of the method.

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