An automatic generation method of the coordinate system for automatic assembly tolerance analysis

2017 ◽  
Vol 95 (1-4) ◽  
pp. 889-903 ◽  
Author(s):  
Yuguang Wu ◽  
Chen Chen
Keyword(s):  
Coordinate System ◽  
Tolerance Analysis ◽  
Automatic Generation ◽  
Automatic Assembly ◽  
Assembly Tolerance

A Comprehensive Tolerancing System for 3D Mechanical Assemblies

2010 ◽  
Vol 139-141 ◽  
pp. 1289-1293 ◽  
Author(s):  
Dong Ya Yang ◽  
Jun Gong
Keyword(s):  
Design Principle ◽  
Tolerance Analysis ◽  
Automatic Generation ◽  
Geometric Feature ◽  
Design Practice ◽  
Simulation Environment ◽  
Assembly Tolerance ◽  
Detail Design ◽  
Comprehensive Method ◽  
Mechanical Assemblies

A comprehensive tolerancing system is presented with its design principle, system architecture and key functions. The following functional modules, automatic generation of dimension chain, equivalent variational mechanism (EVM) modeling and visualized 3D tolerance analysis, are described in detail. Design intent is expressed by assembly tolerance specifications, which may be added to the model and used in computing predicted quality levels. A comprehensive method, based on equivalent replacement, has been developed for modeling variations in 3D mechanical assemblies. The models are constructed of common engineering elements: dimension chain, kinematic joints, assembly datums, dimensional and geometric feature tolerances, and assembly tolerance limits. The method is consistent with engineering design practice and is well suited for integration with commercial CAD systems. To make the tolerancing system robust and efficient, new functionalities are added to well-known CAD software and simulation environment. Tested by many samples, this system shows good robustness and practicability.

Computer Aided Tolerance Analysis of Parts and Assemblies

1989 ◽  
Author(s):  
R. T. Scott ◽  
G. A. Gabriele
Keyword(s):  
Real World ◽  
Probability Distributions ◽  
Three Dimensional ◽  
Tolerance Analysis ◽  
The Real ◽  
Assembly Tolerance ◽  
Computer Aided ◽  
Probability Information ◽  
Exact Constraint

Abstract An exact constraint scheme based on the physical contacting constraints of real part mating features is used to represent the process of assembling the parts. To provide useful probability information about how assembly dimensions are distributed when the parts are assembled as intended, the real world constraints that would prevent interference are ignored. This work addresses some limitations in the area of three dimensional assembly tolerance analysis. As a result of this work, the following were demonstrated: 1. Assembly of parts whose assembly mating features are subjected to variation; 2. Assemble parts using a real world set of exact constraints; 3. Provide probability distributions of assembly dimensions.

A New Tolerance Analysis Method for Designers and Manufacturers

1987 ◽  
Vol 109 (2) ◽  
pp. 112-116 ◽  
Author(s):  
W. H. Greenwood ◽  
K. W. Chase
Keyword(s):  
Tolerance Analysis ◽  
New Method ◽  
Analysis Method ◽  
Worst Case ◽  
Assembly Tolerance ◽  
Naturally Occurring ◽  
Methods Of Analysis

Even when all manufactured parts for an assembly are produced within limits, these parts still may not assemble properly if the assembly tolerance analysis was inadequately performed. Naturally occurring shifts in a process can produce biased distributions which can result in increased assembly problems and a greater number of rejects than anticipated. The most common methods of analysis of assembly tolerance buildup are worst case and root sum squares. The limitations of each of these methods are discussed and a simple new method is proposed which accounts for expected bias. This new method includes both worst case and root sum squares as extreme cases.

T-Maps based Tolerance Analysis of Composites Assembly Involving Compensation Strategies

2021 ◽  
pp. 1-9
Author(s):  
Hua Wang ◽  
Yujin Lin ◽  
Chen Yan
Keyword(s):  
Tolerance Analysis ◽  
Clamping Force ◽  
Analysis Method ◽  
Tolerance Synthesis ◽  
Assembly Tolerance ◽  
Point Space ◽  
Variation Propagation

Abstract Clamping force and shimming are two important compensation processes in the composites assembly. Their effects on variation propagation should be investigated in tolerance analysis. The paper presents a tolerance analysis method for composites assembly based on the T-Maps method, mainly concerning the anisotropic variations accumulation and propagation where there is the clamping force modification and the shimming. Variations of the composite parts in different directions are represented by the T-Maps. Since the different axial deviations are represented in the same Euclidean point-space, the T-Maps based tolerance analysis of the composite parts assembly provides more accurate and reliable results. Compensation processes, the clamping force, and the shimming, on assembly tolerance synthesis of the composite parts, are analyzed clearly in the T-Map. This procedure is found to be effective for the anisotropy oriented assembly tolerance analysis, especially concerning about effect of the clamping force and the shimming on variations accumulation and propagation. The assembly of an aircraft composite elevator is considered to demonstrate the effectiveness of the T-Maps based method. The procedures outlined in the paper are quite general and can be used for assembly tolerance analysis of anisotropic parts.

Digital Automatic Assembly Technology of Stubble-Cutting Equipment of No-Till Planter

2013 ◽  
Vol 423-426 ◽  
pp. 2907-2910
Author(s):  
Xiao Hu Bai ◽  
Fang Li ◽  
Jing Lin
Keyword(s):  
Coordinate System ◽  
Automatic Assembly ◽  
Coordinate Systems ◽  
Improve Design ◽  
No Till ◽  
Cutting Equipment ◽  
Correct Location ◽  
System Constraint ◽  
Assembly Technology ◽  
Operation Results

In the process of product design, automatic assembly technology can shorten the time spent on assembling all parts into a virtual assembly. In this paper, a digital automatic assembly technology based on coordinate system constraint was put forward. Appropriate coordinate systems which can ensure the correct location of part were built during the establishment of part model through the datum tool. The naming method of coordinate system was prescribed. All coordinate systems in every part of stubble-cutting equipment were established. The steps of realizing automatic assembly were explained in detail. The functions Pro/Toolkit provides were used to program. The operation results show that the technology can reduce repetitive work, improve design efficiency and provide a convenient tool for the design of stubble-cutting equipment of no-till planter.

scholarly journals Assembly Deformation and Stresses of Compliant Structures

2011 ◽  
Vol 275 ◽  
pp. 69-72 ◽  
Author(s):  
Chen Song Dong ◽  
Lu Kang
Keyword(s):  
Finite Element Analysis ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Response Surface Methodology ◽  
Regression Model ◽  
Tolerance Analysis ◽  
Assembly Process ◽  
Element Analysis ◽  
Assembly Tolerance ◽  
Large Sheet

Compliant components such as large sheet metal components are commonly used in various products including automotive, aircraft and home appliances. Because of part-to-part variations, deformation and stresses are induced in the assembly process. An approach to the assembly tolerance analysis of compliant structures is presented in this paper. Given component deformation, assembly deformation and stresses are derived by finite element analysis (FEA). The influence of component deformation on assembly deformation and stresses is studied by response surface methodology (RSM), and a regression model is developed. Using the developed regression model, Monte Carlo simulation was conducted to study assembly tolerance and stresses. This approach is illustrated by an example.

scholarly journals Tolerance Analysis of Mechanical Parts

2020 ◽  
Vol 14 (3) ◽  
pp. 265-272
Author(s):  
Živko Kondić ◽  
Đuro Tunjić ◽  
Leon Maglić ◽  
Amalija Horvatić Novak
Keyword(s):  
Tolerance Analysis ◽  
Case Method ◽  
Worst Case ◽  
Mechanical Parts ◽  
Assembly Tolerance ◽  
Huge Impact ◽  
Quality Of Products ◽  
The One

The determination of tolerances has a huge impact on the price and quality of products. The objective of tolerance analysis is to provide the widest possible tolerance range of parts, without disturbing the functionality of the assembly. Tolerance analysis should be performed during the design process because then there is still the possibility for change. For the purpose of carrying out the analysis, three methods will be used: Worst Case method, Root Sum Square method and Monte Carlo Simulation. Methods are explained through simple examples and applied on the one-way clutch.

Visualized Equivalent Variational Modeling in Tolerance Analysis of 3D Mechanical Assemblies

2011 ◽  
Vol 201-203 ◽  
pp. 229-233
Author(s):  
Dong Ya Yang ◽  
Jun Gong
Keyword(s):  
Kinematic Model ◽  
Tolerance Analysis ◽  
Geometric Feature ◽  
Velocity Analysis ◽  
Assembly Tolerance ◽  
Variational Modeling ◽  
Mechanical Assemblies ◽  
Dimensional Variation ◽  
Kinematic Joint

This paper introduces a new, visualized approach for including all the geometric feature variations in the tolerance analysis of mechanical assemblies. It focuses on how to characterize geometric feature variations in vector-loop-based assembly tolerance models. The characterization will be used to help combine the effects of all variations within an assembly in order to perform tolerance analysis of mechanical assemblies by employing commercial 3D kinematic software (e.g. ADAMS). Equivalent variational modeling, based on TAKS method, has been developed for modeling variations in 3D mechanical assemblies. Create a library of Equivalent Variational Joints (EVJs) to allow inclusion all kinds of variations in analysis, and allow the kinematic model to include both geometric and dimensional variation in a velocity analysis. EVJ, for use in tolerance analysis, was developed for commonly used 3D kinematic joint types, and was implemented with examples to explain their use to form Equivalent Variational Mechanisms (EVMs).

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