scholarly journals Development of an Ontology for the Automatic Reconfiguration of a Vise-Type Fixture Device

2011 ◽  
Author(s):  
Thomas Gmeiner ◽  
Kristina Shea
Keyword(s):  
Manufacturing Systems ◽  
Description Logic ◽  
Fixture Design ◽  
Reconfigurable Manufacturing ◽  
Cnc Milling ◽  
Reasoning System ◽  
Cnc Milling Machine ◽  
Key Factor ◽  
Formal Level ◽  
Future Work

The need for reconfigurable manufacturing systems has long been recognized as a key factor to gain the necessary flexibility for economically producing customized products. Automation of the reconfiguration processes is a challenge both on the hardware and the software level. Addressing this issue in the field of fixture design, a new reconfigurable fixture device for a CNC milling machine has been developed. The developed vise contains interchangeable jaws enabling the secure fixture of a wide variety of workpiece geometries. To enable automated reconfiguration, a reasoning system is needed that can determine feasible fixture configurations based on the given workpiece and part as well as the available fixture components. In this paper, an ontology for representing fixture design and reconfiguration knowledge for a specific reconfigurable vise-type fixture is introduced. The creation of the ontology is based on a systematic building methodology to identify necessary concepts, attributes and relations within the domain. Using Description Logic as the representation formalism, core concept definitions and relations are formalized to evaluate the correctness and consistency of the ontology. The ontology is validated both on the informal and on the formal level by its ability to find feasible fixture configurations, i.e. appropriate jaw pairs to fix example workpieces. The paper concludes with a discussion of the results and future work.

An Ontology for the Autonomous Reconfiguration of a Flexible Fixture Device

2013 ◽  
Vol 13 (2) ◽  
Author(s):  
Thomas Gmeiner ◽  
Kristina Shea
Keyword(s):  
Manufacturing Systems ◽  
Design System ◽  
Formal Concept ◽  
Fixture Design ◽  
Reconfigurable Manufacturing ◽  
Cnc Milling ◽  
Reasoning System ◽  
Key Factor ◽  
Core Concepts ◽  
Formal Level

The need for reconfigurable manufacturing systems has long been recognized as a key factor to gain the necessary flexibility for economical production of small batch sizes. Automation of the reconfiguration processes is a challenge both on the hardware and the software level. Addressing this issue in the field of fixture design, a new reconfigurable fixture device for a CNC milling machine has been developed. The developed vise contains interchangeable and customizable jaws enabling the secure fixture of a variety of workpiece geometries. To enable automated reconfiguration, a reasoning system is needed that can determine feasible fixture configurations based on the given workpiece and part as well as the available fixture components. In this paper, an ontology for representing fixture design and reconfiguration knowledge for vise-type flexible fixtures is presented. The ontology builds on and extends an existing ontology for modular fixture design. The creation of the ontology is based on a systematic building methodology, going from informal to formal concept definitions in a middle-out approach. The core concepts and relations of the ontology are presented and the ontology is validated both on the informal and on the formal level by its ability to find feasible fixture configurations, i.e., appropriate vise jaw pairs to fix example workpieces. The ontology can represent type-specific fixture designs in an unambiguous way and can hence serve as a basis for the development of applications needed to create an autonomous fixture design system.

Application of Taguchi and Response Surface Methodologies for Surface Roughness in Rotary Tool Polishing Hardness Mould Steels

2011 ◽  
Vol 87 ◽  
pp. 82-89
Author(s):  
Potejanasak Potejana ◽  
Chakthong Thongchattu
Keyword(s):  
Surface Roughness ◽  
Response Surface ◽  
Laser Scanning ◽  
Cutting Speed ◽  
Optimal Level ◽  
Confocal Laser ◽  
Milling Machine ◽  
Cnc Milling ◽  
Polishing Process ◽  
Cnc Milling Machine

This research proposes a new application of 3-axis CNC milling machine for polishing the 60 HRC hardness steels. The rotary polishing tools are designed by refer to the end-mill ball nose’s design. The diamond powder are coated in rotary polishing tools by resinoid bonding method and concentrated in 4.4 karat/cm2. The Zig-milling tool paths are used to polish the hardness steel. After polishing, the confocal laser scanning microscope is used to analyze the arithmetic mean surface roughness of the hardness steels. The L12 orthogonal array of the Taguchi’s method is selected to conduct the matrix experiment to determine the optimal polishing process parameters. The diamond grit size and cutting speed of the rotary polishing tools, feed rate and step over of the tool path, the depth of polishing process penetration, and polishing time are used to study. The combination of the optimal level for each factor of the hardness steel polishing process are used to study again in the confirmation experiment. The predicted signal to noise ratio of smaller - the better under optimal condition are calculated by using the data from the experiment. The combination of the optimal level for each factor are used to study again in the confirmation experiment and the result show that polishing time was a dominant parameter for the surface roughness and the next was depth of penetration. The response surface design is then used to build the relationship between the input parameters and output responses. The experimental results show that the integrated approach does indeed find the optimal parameters that result in very good output responses in the rotary polishing tools polished hardness mould steel using CNC milling machine. The mean surface roughness of hardness steel polishing process is improved by the diamond rotary tools with the 3-axis CNC milling machine.

scholarly journals Optimizing the Grinding Parameters on the CNC Milling Machine for Best Glass Edge Quality

2021 ◽  
Vol 1885 (3) ◽  
pp. 032069
Author(s):  
Xiaoyu Li ◽  
Minbo Wang ◽  
Liangbao Jiang ◽  
Jiaxi Liu ◽  
Jiaming Li ◽  
...  
Keyword(s):  
Milling Machine ◽  
Cnc Milling ◽  
Cnc Milling Machine ◽  
Grinding Parameters ◽  
Edge Quality ◽  
Glass Edge

scholarly journals Measuring Men’s Gender Norm Beliefs Related to Contraception: Development of the Masculine Norms and Family Planning Acceptance Scale

2021 ◽  
Author(s):  
Sara J. Newmann ◽  
Jennifer Monroe Zakaras ◽  
Shari L. Dworkin ◽  
Mellissa Withers ◽  
Louisa Ndunyu ◽  
...  
Keyword(s):  
Family Planning ◽  
Contraceptive Use ◽  
Gender Norms ◽  
Male Partner ◽  
Masculine Norms ◽  
Pregnancy Spacing ◽  
Key Factor ◽  
Acceptance Scale ◽  
Future Work ◽  
Positive Engagement

AbstractMale partner resistance is identified as a key factor that influences women’s contraceptive use. Examination of the masculine norms that shape men’s resistance to contraception—and how to intervene on these norms—is needed. To assess a gender-transformative intervention in Kenya, we developed and evaluated a masculinity-informed instrument to measure men’s contraceptive acceptance—the Masculine Norms and Family Planning Acceptance (MNFPA) scale. We developed draft scale items based on qualitative research and administered them to partnered Kenyan men (n = 150). Item response theory-based methods were used to reduce and psychometrically evaluate final scale items. The MNFPA scale had a Cronbach’s α of 0.68 and loaded onto a single factor. MNFPA scores were associated with self-efficacy and intention to accept a female partner’s use of contraception; scores were not associated with current contraceptive use. The MNFPA scale is the first rigorously developed and psychometrically evaluated tool to assess men’s contraceptive acceptance as a function of male gender norms. Future work is needed to test the MNFPA measure in larger samples and across different contexts. The scale can be used to evaluate interventions that seek to shift gender norms to increase men’s positive engagement in pregnancy spacing and prevention.

Challenges and Opportunities in Collaborative Vulnerability Research Workflows

2020 ◽  
Vol 64 (1) ◽  
pp. 420-424
Author(s):  
Ryan Mullins ◽  
Deirdre Kelliher ◽  
Ben Nargi ◽  
Mike Keeney ◽  
Nathan Schurr
Keyword(s):  
Human Performance ◽  
Collaborative Work ◽  
Research Process ◽  
Workflow Model ◽  
Human Vulnerability ◽  
Research Teams ◽  
Reasoning System ◽  
Challenges And Opportunities ◽  
New Research ◽  
Future Work

Recently, cyber reasoning systems demonstrated near-human performance characteristics when they autonomously identified, proved, and mitigated vulnerabilities in software during a competitive event. New research seeks to augment human vulnerability research teams with cyber reasoning system teammates in collaborative work environments. However, the literature lacks a concrete understanding of vulnerability research workflows and practices, limiting designers’, engineers’, and researchers’ ability to successfully integrate these artificially intelligent entities into teams. This paper contributes a general workflow model of the vulnerability research process, and identifies specific collaboration challenges and opportunities anchored in this model. Contributions were derived from a qualitative field study of work habits, behaviors, and practices of human vulnerability research teams. These contributions will inform future work in the vulnerability research domain by establishing an empirically-driven workflow model that can be adapted to specific organizational and functional constraints placed on individual and teams.

scholarly journals Development of CNC Milling Machine for Small Scale Industry

2021 ◽  
Vol 1068 (1) ◽  
pp. 012017
Author(s):  
Wasis Nugroho ◽  
Damhuji Rifai ◽  
Aminul Hakim Embong ◽  
Kamarul Adnan Abd Aziz ◽  
Ahmad Siraji Embong ◽  
...  
Keyword(s):  
Small Scale ◽  
Milling Machine ◽  
Cnc Milling ◽  
Cnc Milling Machine ◽  
Small Scale Industry
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