The Prediction of Fixture Comprehensive Influence on the Machining Error of Features Pattern

2015 ◽  
Author(s):  
Gaiyun He ◽  
Longzhen Guo ◽  
Wenjie Tian ◽  
Xiangsong Zhao
Keyword(s):  
Evaluation Method ◽  
Simulation Experiment ◽  
Machining Accuracy ◽  
Positional Error ◽  
Machining Error ◽  
Rectangular Distribution ◽  
Machining Force ◽  
Orientation Deviation ◽  
Position And Orientation ◽  
The Mathematical Model

The position and orientation deviation of workpiece caused by the fixing errors of the fixture influences the machining accuracy of workpiece. This paper presents a method of predicting the fixture induced error and its influence on the machining accuracy of features pattern. Firstly, the mathematical model for predicting fixing error caused by locators and locating surface geometrical errors and caused by clamping force and machining force is formulated. Then, based on the 3-2-1 positioning fixture, the influence of fixing errors on the machining accuracy of features pattern is analyzed after introducing the definition, inspection and evaluation method for the composite position error of features pattern. Finally, taking 4-holes pattern in rectangular distribution as an example, the process of predicting the composite positional error of features pattern is detailed and a simulation experiment is conducted. The results show the rightness and validity of this method.

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.

Gas Storage Cavity Simulation Experiment Research and Application

2014 ◽  
Vol 496-500 ◽  
pp. 891-895
Author(s):  
Ji Fang Wan ◽  
Rui Chen Shen ◽  
Zhong Yuan Ji ◽  
Jing Bin Xie
Keyword(s):  
Simulation Experiment ◽  
Gas Storage ◽  
Salt Rock ◽  
Experiment Research ◽  
Solution Mining ◽  
Drill Site ◽  
Similarity Ratio ◽  
Rock Model ◽  
Salt Caverns ◽  
The Mathematical Model

The real salt cores from drill-site was regarded as the prototype in this experiment. They are used to simulate solution mining process of salt caverns. In this paper the mathematical model of solution mining wasset up.Experimental parameters are obtained by similarity ratio. Afternumerous experiments on the artificial salt rock model,the results show that thecontrol experimental parametersand the references design are effective.This researchhas some guidance on field engineering of solution mining construction.

A Data-Driven Machining Error Analysis Method for Finish Machining of Assembly Interfaces of Large-Scale Components

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Wei Fan ◽  
Lianyu Zheng ◽  
Wei Ji ◽  
Xun Xu ◽  
Lihui Wang ◽  
...  
Keyword(s):  
Error Analysis ◽  
Large Scale ◽  
Tool Path ◽  
Cutting Parameters ◽  
Pso Algorithm ◽  
Data Driven ◽  
Machining Accuracy ◽  
Machining Error ◽  
Spatial Statistical Analysis ◽  
Machining Errors

Abstract To guarantee the final assembly quality of the large-scale components, the assembly interfaces of large components need to be finish-machined on site. Such assembly interfaces are often in low-stiffness structure and made of difficult-to-cut materials, which makes it hard to fulfill machining tolerance. To solve this issue, a data-driven adaptive machining error analysis and compensation method is proposed based on on-machine measurement. Within this context, an initial definite plane is fitted via an improved robust iterating least-squares plane-fitting method based on the spatial statistical analysis result of machining errors of the key measurement points. Then, the parameters of the definite plane are solved by a simulated annealing-particle swarm optimization (SA-PSO) algorithm to determine the optimal definite plane; it effectively decomposes the machining error into systematic error and process error. To reduce these errors, compensation methods, tool-path adjustment method, and an optimized group of cutting parameters are proposed. The proposed method is validated by a set of cutting tests of an assembly interface of a large-scale aircraft vertical tail. The results indicate that the machining errors are successfully separated, and each type of error has been reduced by the proposed method. A 0.017 mm machining accuracy of the wall-thickness of the assembly interface has been achieved, well fulfilling the requirement of 0.05 mm tolerance.

Minimum Zone Evaluation of Symmetry Error for Flatness to Flatness Based on the New Generation GPS

2013 ◽  
Vol 662 ◽  
pp. 887-891
Author(s):  
Qian Qian ◽  
Mei Fa Huang ◽  
Huan Yu Li
Keyword(s):  
Least Square Method ◽  
Mathematic Model ◽  
Least Square ◽  
Adaptive Genetic Algorithm ◽  
Machining Error ◽  
Minimum Zone ◽  
New Generation ◽  
Tolerance Method ◽  
The Mathematical Model ◽  
Better Than

Least square method (LSM) is the most popular method used to evaluate machining error nowadays. However, LSM is likely to overestimate the error value, therefore its solution is only approximate and rather than minimum. In order to obtain the minimum, we study the principle of the minimum zone tolerance method (MZT), analyze the characteristics of the new generation GPS, and give the minimum zone mathematic model of the symmetry error for flatness to flatness. For the purpose of optimizing the mathematical model, this paper describes the application of adaptive genetic algorithm to achieve the best estimation. Simultaneously, the process of optimization is realized by MALTAB. Finally, the experiment shows that the evaluation results of MZT is better than evaluation results of LSM.

The Application Research in the Evaluation of Sports Teaching Quality Based on the Analytic Hierarchy Process

2012 ◽  
Vol 155-156 ◽  
pp. 143-147
Author(s):  
Xian Feng Wang ◽  
Xiang Qi Wang
Keyword(s):  
Analytic Hierarchy Process ◽  
Quality Assessment ◽  
Evaluation Method ◽  
Weight Coefficient ◽  
Teaching Quality ◽  
Analytic Hierarchy ◽  
School Sports ◽  
The Analytic Hierarchy Process ◽  
The Mathematical Model ◽  
Hierarchy Process

The sports teaching quality assessment is a regular schools of higher learning education evaluation of a part, is promoting sports course building and improve the quality of education is an important measures. The current stage of evaluation method is uneven, so need to build a simple and effective, scientific and reasonable evaluation methods to measure the school sports teaching quality. The article to the analytic hierarchy process in the sports teaching the application of quality evaluation carried on the preliminary discussion, put forward the sports teaching quality hierarchical system, and establish the teaching quality assessment of the mathematical model, through the weight coefficient of each index system, more scientific and objective to evaluate teaching quality, easy operation, which is of great use value.

Turning Thermal Deformation Analysis of Aluminum Alloy Spherical Plain Bearing Outer Ring

2014 ◽  
Vol 556-562 ◽  
pp. 733-737
Author(s):  
Yan Jun Li ◽  
Bao Fu Li
Keyword(s):  
Aluminum Alloy ◽  
Element Model ◽  
Outer Ring ◽  
Deformation Analysis ◽  
Machining Accuracy ◽  
Plain Bearing ◽  
Axial Deformation ◽  
Machining Error ◽  
Deformation Law ◽  
Spherical Plain Bearing

Against the problem of large machining error and low productivity of aluminum alloy spherical plain bearing, the paper is concentrated on building finite element model in MATLAB to research the radial and axial deformation law under various cutting conditions with theories of heat transfer, isoparametric element and functional variational method, providing theoretical and data support to enhance machining accuracy of spherical plain bearing outer ring.

A Study of Influence of the Machining Accuracy on Reliability of Cycloidal Gears

2020 ◽  
pp. 9-17
Author(s):  
Y.V. Sinitsyna
Keyword(s):  
Probability Of Failure ◽  
High Load ◽  
Maximum Effect ◽  
Machining Accuracy ◽  
Positional Error ◽  
Aircraft Industry ◽  
Load Bearing Capacity ◽  
The Monte Carlo Method ◽  
Manufacturing Errors ◽  
Fixed Period

Cycloidal gears are widely used in modern robotics, aircraft industry and other industries due to their compactness, high load bearing capacity, rigidity and accuracy. This paper examines a method for calculating stresses at the points of contact of the satellite gear and the pins taking into account manufacturing errors. Based on the Monte Carlo method, the probability of failure-free operation of the cycloid gear is determined by the criterion of contact endurance, taking into account the randomness of deviations of gear sizes from the nominal ones. Graphs showing the relationships between the probability of failure-free operation for a fixed period of time and the torque are presented. It is established that a 2kv gear has a higher reliability compared to the gear manufactured using the khv scheme. Based on the analysis of sensitivity of the failure-free operation probability to manufacturing errors, it is concluded that the positional error of the pin hole has the maximum effect on the gear performance.

Research on NC Dressing of Involute Grinding Wheel

2010 ◽  
Vol 455 ◽  
pp. 132-136
Author(s):  
Xiao Zhong Ren ◽  
Ya Hui Wang ◽  
Jian Xin Su
Keyword(s):  
Mathematical Model ◽  
Simulation Experiment ◽  
Grinding Wheel ◽  
Accuracy Index ◽  
Programming Tool ◽  
Involute Gears ◽  
The Mathematical Model

Aiming at the dressing of involute grinding wheel, the mathematical model of involute interpolation is established. Taking the normal tolerance δ as accuracy index, the dense degree of interpolation points can be changed constantly with the change of developable angle increment △θ so that the numbers of interpolation points can meet the requirements not only for interpolating accuracy, but for interpolating efficiency. The wheel dressing software developed by using VC++ as programming tool can be applied for dressing the involute grinding wheel which can be used to grind involute gears with different teeth and modules. The results of simulation experiment verify the feasibility and correctness of the software.

Study on Dynamic Characteristics and Simulation of Plane Grinding System under Two-Dimensional Ultrasonic Vibration

2008 ◽  
Vol 392-394 ◽  
pp. 304-308
Author(s):  
Bao Yu Du ◽  
Bo Zhao
Keyword(s):  
Natural Frequency ◽  
Ultrasonic Vibration ◽  
Simulation Experiment ◽  
Impedance Analysis ◽  
Frequency Equation ◽  
Frequency Change ◽  
Two Dimensional ◽  
Group System ◽  
The Mathematical Model ◽  
Grinding System

In this paper, the mathematical model with two associated coordinates is established for two-dimension ultrasonic vibration group system by impedance analysis, and natural frequency equation of 2D vibration system is deduced by which the influence of natural frequency change of individual components on the natural frequency of group system is analyzed. Amplitude-frequency characteristics of system were tested which verified the correctness of the theory. In simulation experiment on large plate under two-dimensional ultrasonic vibration grinding, superimposed tracks of a number of irregular ovals exist in vibrating plane, that is different from previous research that only one simply oval track exists in the vibrating plane apparently. The results supply a reliable theoretical and experimental basis for the further discussions on the abrasive removal mechanism under two-dimensional ultrasonic vibration.

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