Concurrent design and process tolerances determination in consideration of geometrical tolerances

2019 ◽  
Vol 233 (19-20) ◽  
pp. 6727-6740 ◽  
Author(s):  
Heping Peng ◽  
Zhuoqun Peng
Keyword(s):  
Target Function ◽  
Concurrent Design ◽  
Manufacturing Cost ◽  
Functional Constraints ◽  
Functional Requirements ◽  
Bound Constraints ◽  
Programming Technique ◽  
Design Efficiency ◽  
Development Cycle ◽  
Product Development Cycle

Concurrent design and process tolerances determination may ensure the manufacturability of products, improve the design efficiency, lower the overall production cost, reduce the quantity of unqualified products, and shorten product development cycle. Yet most of the current concurrent tolerancing models focus on the concurrent design of dimensional tolerances without taking into consideration geometrical tolerances. The objective of this study is to extend the concurrent tolerancing model to consider geometrical tolerance requirements. Firstly, the geometrical tolerances are either converted into equivalent dimensional tolerances or only treated as additional machining constraints based on their respective characteristics. Then, a concurrent tolerancing model is established based on ensuring the fulfillment of the product's functional requirements, taking the combination of expected quality loss and manufacturing cost as target function, and taking the functional constraints, geometrical tolerance constraints and process bound constraints as the constraint conditions. After having established the concurrent tolerancing model, the nonlinear programming technique is employed to solve this model to gain the optimal design and process tolerances. Finally, an example of wheel assembly is given to illustrate the validity of the suggested method.

scholarly journals Making a Difference and a Profit

2015 ◽  
Vol 137 (11) ◽  
pp. 38-43
Author(s):  
Douglas L. Van Bossuyt
Keyword(s):  
Product Development ◽  
Design Process ◽  
Developing World ◽  
Iterative Approach ◽  
Value Proposition ◽  
Customer Feedback ◽  
Development Cycle ◽  
The Social ◽  
Making A Difference ◽  
Product Development Cycle

This article examines different approaches that could be applied / used by engineers for lean design. Lean design can let companies make a profit while satisfying customers in the developing world. In developing markets, difficulty in gathering the necessary data can lead to lengthy delays or broad assumptions in the product development cycle. The iterative approach of lean design stresses leveraging sales data, customer feedback, and distributor feedback to evaluate and refine the important metrics of value, growth, and impact of a particular product that could drive the design process and optimize the product. The experts also say that when designing products for the developing world, making money is not the only value proposition. Engineers must keep ethics in mind. Engineers must also understand the social and health consequences of introducing products into the marketplace and ensure that any product does not adversely impact the customer or community. Products must be designed that have broad enough appeal to drive a sustainable market for the company.

Research and Development of Solid Modeling Technology for Impeller Based on UG/Open

2011 ◽  
Vol 121-126 ◽  
pp. 4038-4042
Author(s):  
Gang Li ◽  
Xiu Ting Wei ◽  
Qian Qian Chen
Keyword(s):  
3D Modeling ◽  
Solid Modeling ◽  
Centrifugal Impeller ◽  
Quality Inspection ◽  
Design Quality ◽  
Modeling Technology ◽  
Development Cycle ◽  
Cad Cam ◽  
Product Development Cycle ◽  
Model Database

To realize CAM of impeller cast moulds, this paper developed an automatic 3D modeling system of impellers, based on hydraulic models and UG/Open technology. The system has functions of hydraulic model database correction, vane surfaces modeling, vane surfaces check, impeller solid modeling, and so on. It achieves design quality inspection and automatic solid modeling of centrifugal impeller as well as CAD/CAM integration of cast mould, with the design precision effectively improved and the product development cycle greatly shortened.

High-throughput screening in the diagnostics industry

2002 ◽  
Vol 30 (4) ◽  
pp. 794-797 ◽  
Author(s):  
S. Wilson ◽  
S. Howell
Keyword(s):  
Product Development ◽  
High Throughput ◽  
High Throughput Screening ◽  
Rapid Identification ◽  
Target Antigen ◽  
Cycle Times ◽  
Development Cycle ◽  
Speed Up ◽  
Product Development Cycle ◽  
Automated Screening

The diagnostics industry is constantly under pressure to bring innovation quicker to market and so the impetus to speed up product-development cycle times becomes greater. There are a number of steps in the product-development cycle where the application of high-throughput screening can help. In the case of lateral-flow immunodiagnostics the selection of antibody reagents is paramount. In particular, rapid identification of antibody pairs that are able to ‘sandwich’ around the target antigen is required. One screen that has been applied successfully is the use of surface plasmon resonance biosensors like Biacore®. Using such a system one can evaluate over 400 antibody pairings in under 5 days. Conventional approaches to screen this number of antibody pairs would take many months. Other automated screening systems like DELFIA® can be used in processing the vast amount of tests required for clinical trials. In addition, the use of robotics to automate routine product testing can be used to shorten the product-development cycle.

What is a Prototype? What are the Roles of Prototypes in Companies?

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Carlye A. Lauff ◽  
Daria Kotys-Schwartz ◽  
Mark E. Rentschler
Keyword(s):  
Decision Making ◽  
Product Development ◽  
Empirical Work ◽  
Consumer Electronics ◽  
Informed Decision Making ◽  
Design Practice ◽  
Ethnographic Studies ◽  
Development Cycle ◽  
Research Questions ◽  
Product Development Cycle

Prototyping is an essential part of product development in companies, and yet it is one of the least explored areas of design practice. There are limited ethnographic studies conducted within companies, specifically around the topic of prototyping. This is an empirical and industrial-based study using inductive ethnographic observations to further our understanding of the various roles prototypes play in organizations. This research observed the entire product development cycle within three companies in the fields of consumer electronics (CE), footwear (FW), and medical devices (MD). Our guiding research questions are: What is a prototype? What are the roles of prototypes across these three companies? Through our analysis, we uncovered that prototypes are tools for enhanced communication, increased learning, and informed decision-making. Specifically, we further refine these categories to display the types of communication, learning, and decision-making that occur. These insights are significant because they validate many prior prototyping theories and claims, while also adding new perspectives through further exploiting each role. Finally, we provide newly modified definitions of a prototype and prototyping based on this empirical work, which we hope expands designers' mental models for the terms.

Robust Tolerance Design Considering Process Capability and Quality Loss

1999 ◽  
Author(s):  
Chang-Xue (Jack) Feng ◽  
Ravi Balusu
Keyword(s):  
Manufacturing Process ◽  
Lead Time ◽  
Process Capability ◽  
Concurrent Design ◽  
Manufacturing Cost ◽  
Tolerance Design ◽  
Quality Loss ◽  
Quality Loss Function ◽  
Capability Indices ◽  
Design And Manufacturing

Abstract Tolerance design bridges design and manufacturing. Concurrent design of tolerances and manufacturing processes may ensure the manufacturability, reduce the manufacturing and other related costs, decrease the number of fraction nonconforming (or defective rate), and shorten the production lead time. Since process capability indices relate tolerance specifications to manufacturing process capabilities, it is quite natural to apply them to concurrent design of tolerances and processes. As process shifts often exist in a manufacturing process, using Cp does not yield a good estimation of fraction nonconforming. Index Cpk does not precisely measure process shift either, but Cpm does. Therefore, this research compares the applications of Cp, Cpk and Cpm based on a numerical example of non-linear mechanical tolerance synthesis. In addition, the Taguchi quality loss function is used together with the manufacturing cost as the objective function.

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