Simulation and experimental research on the injection characteristics of the laser processing injection hole

Nowadays education and research promote interdisciplinary cooperation and development. An interdisciplinary approach creates change and new opportunities for design education in general, while innovation, the use of advanced materials and technologies transforms design technology studies. These changes affect the development of design technology as an integrated interdisciplinary direction, the creation of innovative solutions, products and services in research design activities. This process is facilitated by research grant projects involving students and researchers. The performed experimental research in Rezekne Academy of Technologies (RTA) engineering research centres shows the possibilities of laser processing and 3D printing in textile fabrics design, promotes innovative technological solutions in product design and ensures the development of scientifically based results. The aim of the research is to improve students' independent research activities in purposeful project activities by interacting with various engineering research centers. Research methods used: theoretical - literature and Internet resource research and analysis, empirical - action (case study) research. Eight students of engineering/design study programs and four lecturers – researchers - participants of grant projects - participate in the research. Research period 2017–2020. The research has a practical significance, because it substantiates the interdisciplinary experimental research activity process and results, determining of students' independent research activity improvement direction, promotes the transfer of research results into practice.

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Influence of Process Parameters on Cutting Width in CO2 Laser Processing of Hardox 400 Steel

Applied Sciences ◽

10.3390/app11135998 ◽

2021 ◽

Vol 11 (13) ◽

pp. 5998

Author(s):

Constantin Cristinel Girdu ◽

Catalin Gheorghe ◽

Constanta Radulescu ◽

Daniela Cirtina

Keyword(s):

Experimental Research ◽

Co2 Laser ◽

Process Parameters ◽

Laser Processing ◽

Laser Power ◽

Cutting Speed ◽

Cutting Parameters ◽

Gas Pressure ◽

Influence Of Process Parameters ◽

Minimum Value

This paper presents an experimental research that proposes to determine the influence of process parameters on CO2 laser cutting of 8 mm thick Hardox 400 steel, for which Kerf has a minimum value. The experimental research was conducted according to a complete factorial plan with laser power, assistant gas pressure and cutting speed as the input parameters, and cutting width as the dependable variable. The Design of Experiment (DOE) consisted of 27 references and was completed with four replicas to determine the variation of the Kerf average. Functional, linear and quadratic relations were determined, which describe the Kerf dependence on the cutting parameters in order to establish the most influential parameter. The results show that the independent parameter with the most significant influence was the laser power, with minimum Kerf obtained if the laser power and the assistant gas pressure were adjusted to average values. The interaction between laser power and auxiliary gas pressure at constant cutting speed was investigated to improve Kerf and reduce the laser processing cost. The study offers the right combination of process parameters that leads to a minimum value of the cutting width.

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Experimental research on water-jet guided laser processing

10.1117/12.726482 ◽

2007 ◽

Cited By ~ 1

Author(s):

Ling Li ◽

Yang Wang ◽

Lijun Yang ◽

Jiecheng Chu

Keyword(s):

Experimental Research ◽

Laser Processing ◽

Water Jet

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Solid freeform fabrication of powders using laser processing

Metal Powder Report ◽

10.1016/s0026-0657(97)84744-3 ◽

1997 ◽

Vol 53 (7-8) ◽

pp. 43 ◽

Cited By ~ 1

Author(s):

D Bourell

Keyword(s):

Laser Processing ◽

Solid Freeform Fabrication ◽

Freeform Fabrication

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Secondary Transfer Effect of Contact

Social Psychology ◽

10.1027/1864-9335.40.2.55 ◽

2009 ◽

Vol 40 (2) ◽

pp. 55-65 ◽

Cited By ~ 146

Author(s):

Thomas F. Pettigrew

Keyword(s):

Cognitive Dissonance ◽

Experimental Research ◽

Intergroup Contact ◽

Transfer Effect ◽

Evaluative Conditioning ◽

Transfer Effects ◽

Secondary Transfer ◽

Primary Reduction

This paper reviews the evidence for a secondary transfer effect of intergroup contact. Following a contact’s typical primary reduction in prejudice toward the outgroup involved in the contact, this effect involves a further, secondary reduction in prejudice toward noninvolved outgroups. Employing longitudinal German probability samples, we found that significant secondary transfer effects of intergroup contact exist, but they were limited to specific outgroups that are similar to the contacted outgroup in perceived stereotypes, status or stigma. Since the contact-prejudice link is bidirectional, the effect is inflated when prior prejudice reducing contact is not controlled. The strongest evidence derives from experimental research. Both cognitive (dissonance) and affective (evaluative conditioning) explanations for the effect are offered.

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