Definition of a Tool Library for the Approximation of Freeform Surfaces

2014 ◽  
Vol 875-877 ◽  
pp. 841-846
Author(s):  
Stefan Schäfer ◽  
Jakob Reising ◽  
Scholeh Abedini ◽  
Frederic Bäcker
Keyword(s):  
Manufacturing Process ◽  
Manufacturing Technology ◽  
Freeform Surface ◽  
High Demand ◽  
Freeform Surfaces ◽  
Manual Work ◽  
Serial Production ◽  
Tool Set ◽  
Definition Of

Freeform architecture places a high demand on its accomplishment. With today's technology a lot of individual and manual work is needed. By means of serial-production some challenges such as high costs and compliance of small tolerances can be handled. This results not only in issues in the field of manufacturing technology but also in the field of geometry.In order to simplify the manufacturing process a tool library with a defined minimum count of moulds is developed to map groups of surface elements on each mould. The Aim is to map any freeform surface with a clearly defined tool set based on an approximated curvature description.

Study on Profile-Adaptive Tool System for Small Robots in Large Freeform Surface Polishing

2010 ◽  
Vol 37-38 ◽  
pp. 1327-1331
Author(s):  
Qi Tong Liu ◽  
Jian Ming Zhan ◽  
Jian Hua Mao
Keyword(s):  
Freeform Surface ◽  
Polishing Process ◽  
Processing Efficiency ◽  
Kinematic Equation ◽  
Freeform Surfaces ◽  
Surface Polishing ◽  
Adaptive Tool

An adaptive tool system of polishing robots for large freeform surface which is installed discoid tool is proposed. To improve processing efficiency, the mechanical of adaptive tool system adjust to curvature changing of large freeform surface is designed. Adaptability of the processing is analyzed and simulated, and kinematic equation of tool system is established. The polishing process of large freeform surfaces with tool system is analyzed.

A Temporal Process Specification Language for Virtual Manufacturing Engineering

1998 ◽  
Author(s):  
David E. Lee ◽  
H. Thomas Hahn
Keyword(s):  
Manufacturing Process ◽  
Specification Language ◽  
Virtual Manufacturing ◽  
Process Definition ◽  
Virtual Factory ◽  
Process Specification ◽  
Temporal Relationships ◽  
Temporal Process ◽  
Definition Of ◽  
Virtual Process

Abstract A process specification language is being developed for virtual manufacturing that provides a structured portable definition of a given manufacturing process as well as the ability to specify the temporal relationships between individual operation steps that compose a process. Based on the concepts embodied in markup languages such as HTML, SGML and XML, a portable process definition structure is defined. This structure provides a template from which virtual process specifications can be created. Subsequently, these structures can be exchanged between development environments for virtual process engineering and the actualized manufacturing facilities where processes are implemented. In addition, dependencies in time between the operation steps of a process such as common start times and operation serialization can be represented to allow for a complete specification of temporal behavior of a given manufacturing process. By providing this explicit mechanism for representing temporal constraints, a virtual manufacturing process can be viewed and utilized both in a localized application on a single virtual factory floor as well as distributed across multiple, interlinked virtual environments.

Linear Two-Port Model of an Active Thermoplastic Composite Structure

2013 ◽  
Author(s):  
Anja Winkler ◽  
Uwe Marschner ◽  
Eric Starke ◽  
Niels Modler ◽  
Wolf-Joachim Fischer ◽  
...  
Keyword(s):  
Composite Structure ◽  
Manufacturing Process ◽  
Composite Structures ◽  
Matrix Material ◽  
Manufacturing Technology ◽  
Experimental Results ◽  
Thermoplastic Composite ◽  
Starting Point ◽  
Modal Behavior ◽  
Active Composite

This paper describes new active composite structures based on thermoplastic matrices which contain material homogeneous embedded piezoceramic modules. Starting point is the development of novel thermoplastic compatible piezoceramic modules, so called TPMs. By the utilization of the same matrix material for the composite structure and for the TPM carrier films, these modules afford an opportunity to become directly embedded into the component during its manufacturing process. In this context, the manufacturing technology of the TPMs and of the active composite structure is presented. Furthermore, selected test samples are investigated concerning their modal behavior. Based on the determined characteristics a linear two-port model is used for the reproduction of the experimental results.

scholarly journals Towards a new definition of areal surface texture parameters on freeform surface

Measurement ◽  
2017 ◽  
Vol 109 ◽  
pp. 281-291 ◽  
Author(s):  
Luca Pagani ◽  
Qunfen Qi ◽  
Xiangqian Jiang ◽  
Paul J. Scott
Keyword(s):  
Surface Texture ◽  
Freeform Surface ◽  
Texture Parameters ◽  
Definition Of ◽  
Areal Surface

scholarly journals IAPSO Standard Seawater: Definition of the Uncertainty in the Calibration Procedure, and Stability of Recent Batches

2007 ◽  
Vol 24 (10) ◽  
pp. 1785-1799 ◽  
Author(s):  
Sheldon Bacon ◽  
Fred Culkin ◽  
Nigel Higgs ◽  
Paul Ridout
Keyword(s):  
Reference Material ◽  
Potassium Chloride ◽  
Manufacturing Process ◽  
Calibration Procedure ◽  
Conductivity Ratio ◽  
Coverage Factor ◽  
Expanded Uncertainty ◽  
Significant Variability ◽  
Definition Of

Abstract Standard seawater (SSW) has been employed by oceanographers as a reference material in the determination of salinity for over a century. In all that time, this is the first study to determine the uncertainty of the SSW manufacturing process. SSW is calibrated in reference to carefully prepared solutions of potassium chloride (KCl). All uncertainties in the preparation and measurement of KCl solutions and of new SSW are calculated. The expanded uncertainty of the SSW conductivity ratio is found to be 1 × 10−5, based on a coverage factor of 2, at the time of manufacture. There is no discernible “within batch” variability. No significant variability of quality within or between batches of KCl is found. Measurement of SSW “offsets” from the label conductivity ratio as long as 5 yr after the SSW batch manufacture are reported, and no significant change in label conductivity ratio for SSW batches P130 through P144 outside the expanded uncertainty of 1 × 10−5 is found. This last result is in contrast to some other studies, and herein are suggestions as to why this may be the case.

Inspection Technology for F-Theta Lens: Practices and Discussions

2007 ◽  
Vol 364-366 ◽  
pp. 1191-1196 ◽  
Author(s):  
Hua Li ◽  
Suet To ◽  
Ling Bao Kong ◽  
Chi Fai Cheung ◽  
Wing Bun Lee
Keyword(s):  
Measurement Methods ◽  
Freeform Surface ◽  
Measurement Technology ◽  
Measuring Instruments ◽  
Freeform Surfaces ◽  
Existing Problems ◽  
Laser Scanners ◽  
Pros And Cons ◽  
Lens Surface

This paper presents the inspection technology for a freeform surface component which is named F-theta lens. F-theta lens is widely used in laser scanners, printers, etc. Freeform characterization is one of the main approaches to verify the manufacturing precision of freeform surface. At present, there is still a lack of techniques for the characterization of freeform surfaces. This study aimed to explore some approaches to inspect freeform surfaces. Two types of measurement methods, namely contact and non-contact measurement methods, are employed to measure the F-theta lens surface. The pros and cons, the existing problems, different applications and areas for improvement of the two methods are discussed. A series of advanced measuring instruments are used in the measurement process. A brief description of measurement mechanisms of these instruments is also presented. As a whole, this paper contributes to the development of the precision measurement technology for optical freeform surfaces.

Standalone Throughput Analysis on the Wave Propagation of Disturbances in Production Sub-Systems

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Yang Li ◽  
Qing Chang ◽  
Michael P. Brundage ◽  
Guoxian Xiao ◽  
Stephan Biller
Keyword(s):  
Line Segment ◽  
Production Line ◽  
Evaluation Method ◽  
Production Systems ◽  
System Productivity ◽  
Serial Production ◽  
Multistage Manufacturing ◽  
Performance Indexes ◽  
Single Station ◽  
Definition Of

Standalone throughput (SAT) of a single station is one of the most widely used performance indexes in industry due to its clear definition, ease of evaluation and the ability to provide a guidance for continuous improvement in production systems. A complex multistage manufacturing system is typically segmented into several subsystems for efficient local management. It is important to evaluate performance of each subsystem to improve overall system productivity. However, the definition of standalone throughput of a production subsystem is not as clear as for a single station in current literatures or in practice, not to say an effective evaluation method. This paper deals with the standalone throughput of a serial production line segment. The definition and implication of standalone throughput of a line segment is discussed. A data driven method is developed based on online production data and is proved analytically under a practical assumption. In addition, the method is verified through simulation case studies to be an accurate and fast estimation of the standalone throughput of a production line segment.

Reduction of hole misalignment in turbocharger center housing

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
G. Sundaramali ◽  
C. Vishal Reddy ◽  
Revanth Vinay Kumar Kodali ◽  
Sherin Thomas Sipri ◽  
K. Santhosh Raj ◽  
...  
Keyword(s):  
Manufacturing Process ◽  
Research Work ◽  
Rejection Rate ◽  
Content Type ◽  
Component Problem ◽  
Six Sigma Methodology ◽  
Definition Of ◽  
And Control ◽  
The Impact ◽  
Clamping Pressure

PurposeThis research work focuses on implementing this methodology in reducing the rejection rate of the turbocharger component problem that occurs during the manufacturing process. Using design, measure, analyze, improve and control (DMAIC) processes, it has been identified that clamping pressure on the component is one factor that affects quality. The impact of clamping pressure is studied to arrive at the ideal clamping pressure in which the rejection rate is the least.Design/methodology/approachQuality is the keyword in manufacturing where the production of a defect-free component is the most sought out objective. The definition of quality keeps getting refined throughout the years, from making products with no defects to minimizing rejection and scrap in the manufacturing process. Production facilities, to achieve this purpose, have adopted various methods and use of the DMAIC of Six Sigma methodology is one among them.FindingsThe study identified the fault causing the defect and suggested the methods to correct the fault. The suggestions would result in reducing the losses arising due to this and similar rejection causes.Originality/valueWith the adoption of DMAIC, it is found that misalignment of top and side clamp pressure is zero. When the side clamp pressure is at 75 PSI, and top clamp pressure is changed from 90 PSI to 95 PSI, the mean of responses is greater than the side clamp pressure of 80 PSI. Therefore, from the three-combination top clamp pressure of 100 PSI and the side clamp pressure of 75 PSI is the optimal condition.

Complex Dies Representation and Definition With Complex Feature-Based Model

1995 ◽  
Author(s):  
Kwamivi Mawussi ◽  
Alain Bernard
Keyword(s):  
Manufacturing Process ◽  
Point Of View ◽  
Hierarchical Decomposition ◽  
Large Batch ◽  
Finished Part ◽  
Forged Parts ◽  
Feature Based ◽  
Complex Features ◽  
Definition Of ◽  
Structural Point

Abstract The production of stamped-paris corresponds to a long manufacturing process compared to a mechanical part obtained by chip removing machining. This manufacturing process is characterized by three design functions : the design of finished part, the design of stamped-part and the definition of dies, and two manufacturing functions : the dies machining and the production (large batch) of forged parts. The manifold data handled during the implementation of the design functions require specific representations according to the tasks carried out. In this paper we propose a complex features-based model for the representation and the definition of forging dies which allows to conceptualize all the definition data related to the semantic, structural and topological aspects. According to the semantic and structural point of view, we adopted a functional and hierarchical decomposition of the shape of the die represented which integrates the feature concept. Relations between elements of the model and blend primitives network are defined in order to facilitate the topological comprehension and exploitation of the design results.

Trajectory Generation for Glazing Spray Gun Based on STL Model

2014 ◽  
Vol 487 ◽  
pp. 617-620
Author(s):  
Hai Peng Pan ◽  
Hao Feng ◽  
Li Gang Cao
Keyword(s):  
Ceramic Industry ◽  
Trajectory Generation ◽  
New Method ◽  
Freeform Surface ◽  
Ceramic Product ◽  
Manual Work ◽  
Stl Model ◽  
Product Surface ◽  
Spray Gun

Glazing is a key procedure in ceramic product surface decorating processing. Recently, robots are gradually utilized to fulfill the glazing work instead of manual work. However, the researches on freeform surface glazing technology lag behind the research on robotics technology, thus limits the application of glazing robot in ceramic industry. In order to improve the quality and efficiency of robot glazing, this paper presents a new method which is base on STL model to generate trajectory for glazing spray gun. The whole procedures of this method have been discussed explicitly.

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