Optimization Design for the Large Gantry Machining Center Crossbeam

2011 ◽  
Vol 130-134 ◽  
pp. 2284-2287
Author(s):  
Qing Huang ◽  
Wei Fang Chen ◽  
Wen Hua Ye ◽  
Pei Huang Lou ◽  
Shi Hao Liu
Keyword(s):  
Optimization Design ◽  
Evaluation Method ◽  
Natural Frequencies ◽  
Machining Accuracy ◽  
Objective Functions ◽  
Optimization Analysis ◽  
Machining Center ◽  
Optimization Parameters ◽  
Static Performance ◽  
Performance Evaluation Method

The crossbeam is an important part in the gantry machining center which greatly affects the machining accuracy. Four kinds of crossbeam structure for the large machining center were designed and their static and dynamic characteristics were analyzed. The optimal crossbeam structure was selected by the comprehensive performance evaluation method. Then the thicknesses of rib plates in the crossbeam were defined as the optimization parameters after conducting the sensitivity analysis. The first four natural frequencies were defined as the objective functions and the static performance and the mass were defined as the constraint conditions. The optimal sizes of the rib plates in the crossbeam were obtained by the optimization analysis. Finally the feasibility of the result was demonstrated by the simulation. The result indicated that with the mass increased only by 0.18%, the first four natural frequencies of the optimal crossbeam were increased by 19.56%, 19.45%, 19.84%, 17.05%.

Dynamic Characteristics Analysis for the Headstock of a Vertical Machining Center

2016 ◽  
Vol 836-837 ◽  
pp. 348-358
Author(s):  
Zhe Li ◽  
Song Zhang ◽  
Yan Chen ◽  
Peng Wang ◽  
Ai Rong Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Vibration Characteristics ◽  
Numerical Control ◽  
Vibration Test ◽  
Machining Accuracy ◽  
Modal Test ◽  
Machining Center ◽  
Characteristics Analysis ◽  
Nc Machine

Dynamic characteristics of numerical control (NC) machine tools, such as natural frequency and vibration property, directly affect machining efficiency and finished surface quality. In general, low-order natural frequencies of critical components have significant influences on machine tool’s performances. The headstock is the most important component of the machine tool. The reliability, cutting stability, and machining accuracy of a machining center largely depend on the structure and dynamic characteristics of the headstock. First, in order to obtain the natural frequencies and vibration characteristics of the headstock of a vertical machining center, modal test and vibration test in free running and cutting conditions were carried out by means of the dynamic signal collection and analysis system. According to the modal test, the first six natural frequencies of the headstock were obtained, which can not only guide the working speed, but also act as the reference of structural optimization aiming at frequency-shift. Secondly, by means of the vibration test, the vibration characteristics of the headstock were obtained and the main vibration sources were found out. Finally the corresponding vibration reduction plans were proposed in this paper. That provides the reference for improving the performance of the overall unit.

Dynamic optimization method with applications for machine tools based on approximation model

2017 ◽  
Vol 232 (11) ◽  
pp. 2009-2022 ◽  
Author(s):  
TJ Li ◽  
XH Ding ◽  
K Cheng ◽  
T Wu
Keyword(s):  
Machine Tool ◽  
Performance Optimization ◽  
Machine Tools ◽  
Optimization Design ◽  
Natural Frequencies ◽  
Dynamic Performance ◽  
Machining Process ◽  
Machining Accuracy ◽  
Approximation Model ◽  
Dynamic Behaviors

Natural frequencies and modal shapes of machine tools have position-dependent characteristics owing to their dynamic behaviors changing with the positions of moving parts. It is time-consuming and difficult to evaluate the dynamic behaviors of machine tools and their machining accuracy at different positions. In this paper, a Kriging approximation model coupled with finite element method is proposed to substitute the dynamic equations for obtaining the position-dependent natural frequencies of a machine tool, as well as relative positions between the tool and the workpiece during the machining process. Based on the proposed method, dynamic performance optimization design of the machine tool is conducted under the condition of minimum relative positions. Three case studies are illustrated to demonstrate the implementation of the proposed method.

scholarly journals Design Method of B-Axis Components of Water Chamber Head Turning and Milling Machining Center

2015 ◽  
Vol 9 (1) ◽  
pp. 226-233 ◽  
Author(s):  
Zheng Minli ◽  
Cheng Fenglan ◽  
Zhao Jiaxue ◽  
Sun Shouzheng ◽  
Jiang Chongmin
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Equal Mass ◽  
Joint Surface ◽  
Machining Accuracy ◽  
Analysis Model ◽  
Head Turning ◽  
Design Scheme ◽  
Machining Center ◽  
Water Chamber

Aiming at the demands of nuclear water chamber head’s multi-inclined holes and ramps in boring and milling, based on design requirements of special turning and milling machining center, B-axis structural design is put forward, research on deformation characteristics of ram components under different swing angle, propose the control methods of deformation and errors. Adopt modeling method of equal mass, construction of deformation and displacement analysis model of B-axis components, explore formation reason of maximum gap between components’ joint surface, form optimization design scheme of rotation structure of B-axis components. Trial-produce prototype of B-axis components, make experiment of trial cut water chamber head in turning and milling machining center, utilize test results of part's machining quality, verify unloading effects and machining accuracy of design scheme of B-axis components has been verified.

Fuzzy Optimization Design on Worm Drive

1992 ◽  
Author(s):  
Lin Qun ◽  
Zhong Wenhui ◽  
Wu Meijuan
Keyword(s):  
Design Problem ◽  
Optimization Design ◽  
Evaluation Method ◽  
Optimization Technique ◽  
Fuzzy Optimization ◽  
Reference Value ◽  
Fuzzy Synthetic Evaluation ◽  
Objective Functions ◽  
Numerical Result ◽  
Worm Drive

Abstract A mathematical model of multi-objective fuzzy optimization design is described in this paper, where the volume of corona dentis and the efficiency of transmission were chosen as objective functions. The optimal confidence level λ* and the augmentation coefficient β were specified by using two-level fuzzy synthetic evaluation method. As a consequence, the fuzzy optimization design problem was converted into non-fuzzy optimization design problem which could be solved with the mixed discrete optimization technique. The numerical result would be of some reference value to the design of worm drive.

Static and Dynamic Performance of High-Speed Vertical Machining Center Spindle Box

2012 ◽  
Vol 192 ◽  
pp. 185-189
Author(s):  
Rong Chang Li ◽  
Ai Xia He
Keyword(s):  
High Speed ◽  
Optimization Design ◽  
Dynamic Performance ◽  
Complex Structure ◽  
Temperature Deformation ◽  
Factors Affecting ◽  
Machining Center ◽  
Box Structure ◽  
Static Performance ◽  
Strength And Stiffness

In order to improve the static performance of high speed machining center spindle box, using ANSYS software static performance analysis, static analysis of finite element method to the complex structure of the spindle box, draw a box structure under the force load and temperature load stiffness theoretical values, emphasizing the factors affecting temperature deformation, provides a basis to improve and control the strength and stiffness of the spindle box, as well as box optimization design of the design constraints.

Optimum Design for the Frame of Open Type Abrasive Flow Polish Machine

2012 ◽  
Vol 497 ◽  
pp. 89-93
Author(s):  
Liang Liang Yuan ◽  
Ke Hua Zhang ◽  
Li Min
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Finite Element Methods ◽  
Optimization Design ◽  
Low Cost ◽  
Three Dimensional ◽  
Force Model ◽  
Optimization Analysis ◽  
Open Type ◽  
Set Up

In order to process heterotype hole of workpiece precisely, an open abrasive flow polish machine is designed, and the optimization design of machine frame is done for low cost. Firstly, basing on the parameters designed with traditional ways, three-dimensional force model is set up with the soft of SolidWorks. Secondly, the statics and modal analysis for machine body have been done in Finite element methods (FEM), and then the optimization analysis of machine frame has been done. At last, the model of rebuild machine frame has been built. Result shows that the deformation angle value of machine frame increased from 0.72′ to 1.001′, the natural frequency of the machine decreased from 75.549 Hz to 62.262 Hz, the weight of machine decreased by 74.178 Kg after optimization. It meets the strength, stiffness and angel stiffness requirement of machine, reduces the weight and cost of machine.

Performance evaluation method of hybrid navigation constellations with invalid satellites

2011 ◽  
Vol 54 (6) ◽  
pp. 1046-1050 ◽  
Author(s):  
Yang Yang ◽  
Bo Peng ◽  
XuRong Dong ◽  
Li Fan ◽  
Li Liu ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Evaluation Method ◽  
Performance Evaluation Method
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