11,791 research outputs found
База данных - основа проектирования станочных приспособлений
Розроблено структуру бази даних для системи автоматизованого проектування верстатних пристроїв. Запропоновано та розроблено бібліотеки для інформаційної підтримки, накопичення та зберігання інформації при проектуванні верстатних пристроїв.Разработана структура базы данных для системы автоматизированного проектирования станочных приспособлений. Предложены и разработаны библиотеки для информационной поддержки, накопления и хранения информации при проектировании станочных приспособлений.The structure of database for computer-aided fixture design system was developed. The libraries for information support, accumulation and storing under fixture design were proposed and developed
База данных - основа проектирования станочных приспособлений
Розроблено структуру бази даних для системи автоматизованого проектування верстатних пристроїв. Запропоновано та розроблено бібліотеки для інформаційної підтримки, накопичення та зберігання інформації при проектуванні верстатних пристроїв.Разработана структура базы данных для системы автоматизированного проектирования станочных приспособлений. Предложены и разработаны библиотеки для информационной поддержки, накопления и хранения информации при проектировании станочных приспособлений.The structure of database for computer-aided fixture design system was developed. The libraries for information support, accumulation and storing under fixture design were proposed and developed
FIXES, a system for automatic selection of set-ups and design of fixtures
This paper reports on the development of a computer aided planning system for the selection of set-ups and the design of fixtures in part manufacturing. First, the bottlenecks in the present planning methods are indicated. A brief description is given of the CAPP environment PART, in which FIXES is incorporated. The planning procedure of FIXES consists of two parts: the selection of set-ups and the design of a fixture for each set-up. The automatic selection of set-ups is based on the comparison of the tolerances of the relations between the different shape elements of the part. A tolerance factor has been developed to be able to compare the different tolerances. The system automatically selects the positioning faces and supports the selection of tools for positioning, clamping and supporting the part. A prototype implementation of FIXES is discussed
Variation propagation of bench vises in multi-stage machining processes
Comunicación presentada a MESIC 2019 8th Manufacturing Engineering Society International Conference (Madrid, 19-21 de Junio de 2019)Variation propagation has been successfully modeled by the Stream of Variation (SoV) approach in multistage machining processes. However, the SoV model basically supports 3-2-1 fixtures based on punctual locators and other workholding systems such as conventional vises are not considered yet. In this paper, the SoV model is expanded to include the fixture- and datum-induced variations on workholding devices such as bench vises. The model derivation is validated through assembly and machining simulations on Computer Aided Design software. The case study analyzed shows an average error of part quality prediction between the SoV model and the CAD simulations of 0.26%
Incremental simulation modelling for Internet collaborative design
In order to support Web-based collaborative design in terms of transferring or updating models dynamically and efficiently, new incremental modelling and local updating strategies have been developed for simulation modelling application since
simulation is more focused on visualisation effects than on geometry details. Based on an assembly connection concept, a drag-and-drop assembly method has also been proposed in simulation assembly. An assembly connection is defined as a group of assembly constraints and it makes assembly easier. A case study example is given to show the content of the proposed research
Principles for aerospace manufacturing engineering in integrated new product introduction
This article investigates the value-adding practices of Manufacturing Engineering for integrated New Product Introduction. A model representing how current practices align to support lean integration in Manufacturing Engineering has been defined. The results are used to identify a novel set of guiding principles for integrated Manufacturing Engineering. These are as follows: (1) use a data-driven process, (2) build from core capabilities, (3) develop the standard, (4) deliver through responsive processes and (5) align cross-functional and customer requirements. The investigation used a mixed-method approach. This comprises case studies to identify current practice and a survey to understand implementation in a sample of component development projects within a major aerospace manufacturer. The research contribution is an illustration of aerospace Manufacturing Engineering practices for New Product Introduction. The conclusions will be used to indicate new priorities for New Product Introduction and the cross-functional interactions to support flawless and innovative New Product Introduction. The final principles have been validated through a series of consultations with experts in the sponsoring company to ensure that correct and relevant content has been defined
Analysis and control of complex collaborative design systems
This paper presents a novel method for modelling the complexity of collaborative design systems based on its analysis and proposes a solution to reducing complexity and improving performance of such systems. The interaction and interfacing properties among many components of a complex design system are analysed from different viewpoints and then a complexity model for collaborative design is established accordingly. In order to simplify complexity and improve performance of collaborative design, a general solution of decomposing a whole system into sub-systems and using unified interface mechanism between them has been proposed. This proposed solution has been tested with a case study. It has been shown that the proposed solution is meaningful and practical
Implementing Rapid Prototyping Using CNC Machining (CNC-RP) Through a CAD/CAM Interface
This paper presents the methodology and implementation of a rapid machining system using a
CAD/CAM interface. Rapid Prototyping using CNC Machining (CNC-RP) is a method that has
been developed which enables automatic generation of process plans for a machined component.
The challenge with CNC-RP is not the technical problems of material removal, but with all of
the required setup, fixture and toolpath planning, which has previously required a skilled
machinist. Through the use of advanced geometric algorithms, we have implemented an
interface with a CAD/CAM system that allows true automatic NC code generation directly from
a CAD model with no human interaction; a capability necessary for a practical rapid prototyping
system.Mechanical Engineerin
Synchronization for different opinions in Malaysia Multiracial Society: a mathematical exploration study
Malaysia is known for the multiracial and multicultural society who lives together
harmoniously despite of the diversities. The tolerance of the people towards each
others’ culture and religions has always been the subject of interest for social science
researchers. The harmony is due to the phenomena of synchronization of the
notions among the community. Synchronization has been widely studied since it
is a natural phenomena happening around us everyday, such as the synchronization
of fireflies flashes at night. In relate of these, we anticipate in the study of
the synchronization of the opinions in a diverse society with mathematical modelling.
In this thesis, we analyse three different methods of synchronization by 3
different models: Kuramoto model, Opinion Changing Rate model and a linear
model associate with the famous Friedkin and Johnsen Model. We first develop a
modified version of existing mathematical models and then conduct the numerical
experiment on the models to utilize them in the desired framework
Laser Deposition Cladding On-Line Inspection Using 3-D Scanner
Laser deposition directly deposits metal cladding to fabricate and repair components. In
order to finish the fabrication or repair, 3-D shape of the deposition needs to be inspected, and
thus it can be determined if it has sufficient cladding to fabricate a part after deposition process.
In the present hybrid system in the Laser Aided Manufacturing Lab (LAMP) at the University of
Missouri - Rolla, a CMM system is used to do the inspection. A CMM requires point-by-point
contact, which is time consuming and difficult to plan for an irregular deposition geometry. Also,
the CMM is a separate device, which requires removal of the part from the hybrid system, which
can induce fixture errors. The 3-D scanner is a non-contact tool to measure the 3-D shape of laser
deposition cladding which is fast and accurate. In this paper, A prototype non-contact 3-D
scanner approach has been implemented to inspect the free-form and complex parts built by laser
deposition. Registration of the measured model and 3-D CAD model allows
the comparison between the two models. It enables us to determine if the deposition is sufficient
before machining.Mechanical Engineerin
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