Design the Angular Feature for Manufacturability With Tolerance Chart

2000 ◽  
Author(s):  
Jianbin Xue ◽  
Ping Ji
Keyword(s):  
Manufacturing Process ◽  
Special Functions ◽  
Process Plan ◽  
Operation Sequence ◽  
Design Engineers ◽  
Tolerance Chart ◽  
Operation Stage ◽  
Tolerance Charts

Abstract Many products have angular features for certain special functions. Although the design engineers have considered the capability of manufacturing process when they design the parts of a product, some hidden problems about the manufacturability of the angular features are still difficult to be discovered by most of the design engineers. In this paper tolerance charts are used to design the angular features for manufacturability. Using the tolerance chart for a simple tapered part, the work dimensions and tolerances at each operation stage of manufacturing are obtained. A very tight tolerance on adjacent surfaces is created because of the tapered feature. This problem will not be discovered until the tolerance chart is employed to analyze the designed tolerances and the operation sequence. Therefore, either the design of the tolerance or the process plan of the workpiece should be modified in order to fabricate the part at a small cost of manufacturing.

Automated Reuse of Solutions in Manufacturing Process Planning Through a Case-Based Approach

1996 ◽  
Author(s):  
M. Marefat ◽  
J. Britanik
Keyword(s):  
Process Planning ◽  
Manufacturing Process ◽  
Object Oriented ◽  
Process Plan ◽  
Primary Mechanism ◽  
Prismatic Parts ◽  
Manufacturing Process Planning ◽  
Computer Aided ◽  
Effective Use ◽  
Case Based

Abstract This research focuses on the development of an object-oriented case-based process planner which combines the advantages of the variant and generative approaches to process planning. The case-based process planner operates on general 3D prismatic parts, represented by a collection of features (eg: slots, pockets, holes, etc.). Each feature subplan is developed by the case-based planner. Then the feature subplans are combined into the global process plan for the part via a hierarchical plan merging mechanism. Abstracted feature subplans correspond to cases, which are used in subsequent planning operations to solve new problems. The abstracting and storing of feature subplans as cases is the primary mechanism by which the planner learns from its previous experiences to become more effective and efficient. The computer-aided process planner is designed to be extensible and flexible through the effective use of object-oriented principles.

A CAD/CAM Representation Model Applied to Tolerance Transfer Methods

1998 ◽  
Author(s):  
Alain Desrochers
Keyword(s):  
Three Dimensional ◽  
Dimensional Representation ◽  
One Dimensional ◽  
Dimensional Tolerance ◽  
Representation Model ◽  
Three Dimensional Representation ◽  
Tolerance Chart ◽  
Cad Cam ◽  
Tolerance Charts

Abstract This paper presents the adaptation of tolerance transfer techniques to a model called TTRS for Technologically and Topologically Related Surfaces. According to this model, any three-dimensional part can be represented as a succession of surface associations forming a tree. Additional tolerancing information can be associated to each TTRS represented as a node on the tree. This information includes dimensional tolerances as well as tolerance chart values. Rules are then established to simulate tolerance chains or stack up along with tolerance charts directly from the graph. This way it becomes possible to combine traditional one dimensional tolerance transfer techniques with a powerful three-dimensional representation model providing high technological contents.

A Digraphic Approach for Dimensional Chain Identification in Design and Manufacturing

1996 ◽  
Vol 118 (4) ◽  
pp. 539-544 ◽  
Author(s):  
P. Ji ◽  
J. Y. H. Fuh ◽  
R. S. Ahluwalia
Keyword(s):  
Dimensional Chain ◽  
Process Plan ◽  
Tolerance Charting ◽  
Tolerance Chart ◽  
Design And Manufacturing ◽  
The Relationship

In order to determine working dimensions and tolerances of a process plan, a tolerance chart is often employed. Dimensional chain identification is a necessary step in the tolerance charting procedures. This paper presents a digraphic representation for the tolerance chart. Two directed trees are generated from working dimensions, blueprint dimensions and stock removals of the tolerance chart. These trees are then used to identify dimensional chains in order to find the relationships among the design and manufacturing dimensions. Furthermore, the concept of a reverse dimensional chain is introduced. The reverse dimensional chains can also be identified from the directed trees. The relationship between the forward and reverse dimensional chains is also discussed. Finally, the applications of dimensional chains to the determination of the working dimensions and tolerances are briefly described.

Design Methodology for Manufacturing Automation System Reconfiguration

2010 ◽  
Author(s):  
Muhamad Arfauz A. Rahman ◽  
John P. T. Mo
Keyword(s):  
System Design ◽  
Manufacturing Process ◽  
Design Methodology ◽  
Manufacturing System ◽  
Value Added ◽  
Automation System ◽  
User Requirements ◽  
Reconfigurable Manufacturing ◽  
Manufacturing Automation ◽  
Design Engineers

The fluctuating customer demand especially in product requirements and system specifications these days requires system design engineers to configure and reconfigure the manufacturing system regularly. This paper elaborates a configuration study of a manufacturing system as well as illustrating basic design methodology of capturing user requirements and specifications for flexible reconfiguration in manufacturing automation system. The configuration study was conducted to accumulate various design outcomes from a given manufacturing process. The manufacturing process chosen for the study describes a simple yet easy to understand process in which groups of system design engineers were required to produce potential design configurations suitable for the process. The outcomes are then utilized to formulate a general rules for the configuration and reconfiguration methodology. The methodology presented is based on the steps and work descriptions provided by the user requirements and specifications. In order to simplify the configuration and reconfiguration works, method of capturing user requirements and specifications is required. The later idea of undergoing this research is to find suitable method to capture and manipulate the user requirements and specifications and later provide an optimum solution for the design of flexible and reconfigurable manufacturing automation system. Once completed, the methodology can be a value added advantage to the future of configuration and reconfiguration framework for the manufacturing automation system. In addition to that, the industry will benefit from the outcomes of the research by having the ability to optimize the system and minimizing the risk of investment of new system at a faster pace.

scholarly journals Development of an Evaluating Method for Carbon Emissions of Manufacturing Process Plans

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yanhong Wang ◽  
Hua Zhang ◽  
Zhiqing Zhang ◽  
Jing Wang
Keyword(s):  
Process Planning ◽  
Carbon Emissions ◽  
Manufacturing Process ◽  
Carbon Emission ◽  
Manufacturing Industry ◽  
Evaluation Method ◽  
Energy Utilization ◽  
Carbon Intensity ◽  
Emission Analysis ◽  
Process Plan

Carbon intensity reduction and energy utilization enhancement in manufacturing industry are becoming a timely topic. In a manufacturing system, the process planning is the combination of all production factors which influences the entail carbon emissions during manufacturing. In order to meet the current low carbon manufacturing requirements, a carbon emission evaluation method for the manufacturing process planning is highly desirable to be developed. This work presents a method to evaluate the carbon emissions of a process plan by aggregating the unit process to form a combined model for evaluating carbon emissions. The evaluating results can be used to decrease the resource and energy consumption and pinpoint detailed breakdown of the influences between manufacturing process plan and carbon emissions. Finally, the carbon emission analysis method is applied to a process plan of an axis to examine its feasibility and validity.

A Methodology of CAPP/CAP Systems Integration Based on a Product Intermediate State Representation

2014 ◽  
Vol 1036 ◽  
pp. 915-920
Author(s):  
Cezary Grabowik ◽  
Krzysztof Kalinowski ◽  
Wojciech Kempa ◽  
Iwona Paprocka
Keyword(s):  
Manufacturing Process ◽  
Functional Model ◽  
Current Status ◽  
Product State ◽  
Manufacturing Execution System ◽  
Process Plan ◽  
Treatment Information ◽  
Intermediate States ◽  
Process Disturbances ◽  
Modified Functional

The proposed idea of the integration methodology is based on the two basic pillars it is the modified functional model of the manufacturing process plan and a product intermediate states representation. The product state in certain moment of the manufacturing process can be identified by a set of states which describe the current status of the manufacturing process advance for particular manufacturing features. On the other hand from a manufacturing process nature results that during its course a product can be at one of the following states after rough, medium and finishing manufacturing treatment. Information about product states makes the full integration between CAPP and CAP systems possible. The proposed methodology allows reacting to unexpected production process disturbances. In this case the CAP system in cooperation with manufacturing execution system MES, which collects production data just from PLCs controllers, communicates with CAPP system in the feedback loop and sends a set of the product intermediate states. Base on this description the CAPP system redesign a manufacturing process plan taking into account the current product state. In the paper the modified functional model of the technological process plan and the method of product intermediate states are presented. Moreover the proposal of the functional schema of the integrated CAD/CAPP/CAP environment is shown.

Representation of Manufacturing Environment and Structured Knowledge Base in a CAPP System

1995 ◽  
Author(s):  
Xiangyu Zhou ◽  
Junqi Yan ◽  
Yi Jin ◽  
Dengzhe Ma ◽  
Zhi-Kui Ling
Keyword(s):  
Knowledge Base ◽  
Process Planning ◽  
Data Model ◽  
Manufacturing Process ◽  
Hierarchical Data ◽  
Manufacturing Environment ◽  
Process Plan ◽  
Computer Aided Process Planning ◽  
Computer Aided ◽  
Structured Knowledge

Abstract Process Planning of a product determines the process activities during its manufacturing process. Transformation of the product from design to its final form by process planning is controlled by its manufacturing environment. In this paper, the systematic representation of a manufacturing environment and a hierarchical data model to represent a process plan is studied and introduced for the flexibility of the Computer Aided Process Planning (CAPP) system and for the integration purpose. An event-driven architecture for the design of general CAPP systems is established based on these models. A CAPP system (U-CAPP) developed by the authors based on these concepts is briefly described.

scholarly journals Getting it Right the First Time

2000 ◽  
Vol 122 (05) ◽  
pp. 68-70
Author(s):  
Jean Thilmany
Keyword(s):  
Quality Control ◽  
Manufacturing Process ◽  
Statistical Data ◽  
Shop Floor ◽  
Manufacturing Companies ◽  
Quality Matters ◽  
Design Engineers ◽  
First Time ◽  
Potential Customers ◽  
Rigorous Quality Control

This article highlights that quality control at manufacturing companies take many forms. Basically, quality control implies that everyone involved in the manufacture of a product or part makes sure it can be easily manufactured and that after it has been made, it meets certain predetermined specifications. Other industries are following ISO standards and becoming certified to show potential customers that they maintain rigorous quality control standards. Companies interested in quality matters have a host of technologies to help them achieve their goals. Other technologies exist, such as JMP from SAS Institute in Cary, NC, which analyzes data from the shop floor in order to monitor performance. Numbers that do not fit set patterns might alert engineers to a manufacturing problem. The software links graphics, such as charts and graphs, with the statistical data so engineers can better conceptualize the statistics. Quality control is not only about inspecting products after they are produced. In fact, it often begins at the very first step in the manufacturing process—ensuring that design engineers have all the information they need to properly design a part, and making sure they are properly trained on any software they use while creating the design.

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