Three-dimensional modelling of manufacturing tolerancing using the ascendant approach

In product design and quality improvement fields, the development of reliable 3D machining variation models for multi-station machining processes is a key issue to estimate the resulting geometrical and dimensional quality of manufactured parts, generate robust process plans, eliminate downstream manufacturing problems and reduce ramp-up times. In the literature, two main 3D machining variation models have been studied: the Stream of Variation (SoV) model, oriented to product quality improvement (fault diagnosis, process planning evaluation and selection, etc.), and the Model of the Manufactured Part (MoMP), oriented to product and manufacturing design activities (manufacturing and product tolerance analysis and synthesis). This paper reviews the fundamentals of each model and describes step by step how to derive them using a simple case study. The paper analyzes both models and compares their main characteristics and applications. A discussion about the drawbacks and limitations of each model and some potential research lines in this field are also presented.

show abstract

“…Basically, two main applications of the MoMP are distinguished: tolerance analysis [40,42,[45][46][47][48] and tolerance synthesis [43,49,50].…”

Section: Main Applicationsmentioning

confidence: 99%

“…In this field, Ayadi et al [45] applied the MoMP for MMPs based on 3-2-1 generic fixtures. The proposed an ascendant transfer method to simplify the resolution of the virtual inspection equation (e.g.…”

Section: Tolerance Analysismentioning

confidence: 99%

Manufacturing variation models in multi-station machining systems

Abellán-Nebot

Romero

Mira

2012

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…The equations obtained are very complex, and finding the most unfavorable situation and optimizing manufacturing tolerances are difficult. So, Ayadi et al [4] propose to place the nominal model directly on the datum. Usually, these methods allow us to do the tolerances analyzed but do not allow us to determine the type of specifications, datums, and modifiers.…”

Section: State Of the Artmentioning

confidence: 99%

3D ISO manufacturing specifications with vectorial representation of tolerance zones

Mickaël

Anselmetti

2011

Int J Adv Manuf Technol

View full text Add to dashboard Cite

In order to respect the functional drawing of a part, the process planer first has to choose the manufacturing process and then establish the manufacturing specifications to fulfill on the part after each phase. This paper introduces the tolerance zone transfer method, which is based on a vectorial representation of tolerance zones. For each functional requirement, it consists in analyzing the tolerance zone mobilities and the datum function. The transfer determines by iteration manufacturing specifications for each phase. Operations on degrees of freedom allow us to specify the right need using the ISO standards of tolerancing.

show abstract

“…In this context, the purpose of the manufacturing dimensioning and tolerancing is to determine the intermediate geometric and dimensional model of the part that corresponds to each manufacturing phase. This manufacturing tolerancing also serve to satisfy not only the functional requirements given in the definition drawing, but also the manufacturing constraints such as the machine accuracy and minimum extra machining thickness [1]. The simulation and production transfer tools, widely used in tolerancing, are generally unidirectional, such us the dimension chains method used in Thilak et al [2], or the ∆l method developed by Pierre Bourdet [3].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Synthesis of Manufacturing Tolerances Based on Analysis Using the Ascending Approach

et al. 2022

Self Cite

View full text Add to dashboard Cite

The present paper develops a new approach for manufacturing tolerances synthesis to allow the distribution of these tolerances over the different phases concerned in machining processes using relationships written in the tolerance analysis phase that have been well developed in our previous works. The novelty of the proposed approach is that the treatment of non-conventional surfaces does not pose a particular problem, since the toleranced surface is discretized. Thus, it is possible to study the feasibility of a single critical requirement as an example. During the present approach, we only look for variables that influence the requirements and the others are noted F (Free). These variables can be perfectly identified on the machine, which can be applied for known and unknown machining fixtures; this can be the base for proposing a normalized ISO specification used in the different machining phases of a mechanical part. The synthesis of machining tolerances takes place in three steps: (1) Analysis of the relationship’s terms, which include the influence of three main defects; the deviation on the machined surface, defects in the machining set-up, and the influence of positioning dispersions; then (2) optimization of machining tolerance through a precise evaluation of these effects; and finally (3) the optimization of the precision of the workpiece fixture, which will give the dimensioning of the machining assembly for the tooling and will allow the machining assembly to be qualified. The approach used proved its efficiency in the end by presenting the optimal machining process drawing that explains the ordered phases needed to process the workpiece object of the case study.

show abstract

Three-dimensional modelling of manufacturing tolerancing using the ascendant approach

Cited by 15 publications

References 7 publications

Manufacturing variation models in multi-station machining systems

Manufacturing variation models in multi-station machining systems

3D ISO manufacturing specifications with vectorial representation of tolerance zones

Three-Dimensional Synthesis of Manufacturing Tolerances Based on Analysis Using the Ascending Approach

Contact Info

Product

Resources

About