Theoretical and experimental studies of a gas stamping device with a piston pressure multiplier

In many industries, the share of small-scale production plants is significant. In these conditions, compared with traditional methods of pressure treatment, pulse pressure treatment methods, one of the varieties of which is gas stamping, are more efficient. However, the known devices of gas stamping provide mainly stamping of thin-walled parts. To expand the technological capabilities of gas stamping, the authors developed a gas stamping device with a piston pressure multiplier, in which heating and deformation of the stamping workpiece is carried out using the energy of combustion of fuel mixtures in the combustion chamber, in the working cylinder and in the cavity of the matrix. This article is devoted to the study of the workflow of this device. Theoretical analysis of the workflow was carried out, and, as a result, a pattern was determined for the variation of the pressure that performs the stamping process in the working cylinder. In particular, it was found that at the final stage of the stamping process, due to the energy of combustion of the fuel mixture, the pressure in the working cylinder increases 1.5...2 times, which allows a significant increase in the thickness of the parts to be stamped. An experimental gas stamping device with a piston pressure multiplier was developed, and experimental studies were carried out. The studies confirmed the main results of the theoretical analysis: the discrepancy between the theoretical and experimental values of the degree of pressure multiplication in the working cylinder does not exceed 11%.

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ANALYSIS OF TECHNOLOGICAL POSSIBILITIES OF TWO-CHAMBER IMPULSE DEVICES FOR SHEET STAMPING

ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА ◽

10.36622/vstu.2021.17.6.016 ◽

2022 ◽

pp. 111-117

Author(s):

А.Ю. Боташев ◽

А.А. Мусаев

Keyword(s):

Combustion Chamber ◽

Fuel Mixture ◽

Combustion Products ◽

Small Scale ◽

Scale Production ◽

Technological Capabilities ◽

Combustion Chambers ◽

Ferrous Alloys ◽

Stamping Process ◽

Sheet Stamping

Проведен анализ технологических возможностей двухкамерных устройств для листовой штамповки с одной и двумя камерами сгорания. В устройствах с одной камерой сгорания штамповка детали происходит в холодном состоянии заготовки под действием на нее гибкой среды за счет кинетической энергии поршня, ускоряемого продуктами сгорания газообразной топливной смеси. В устройствах с двумя камерами сгорания процесс штамповки совершается с нагревом заготовки воздействием на нее горячего газа, образованного при сгорании в верхней камере предварительно сжатой топливной смеси. При этом сжатие смеси осуществляется за счет энергии продуктов сгорания, образованных в нижней камере сгорания. Доказано, что устройства с одной камерой сгорания целесообразно использовать для штамповки из пластичных сортов сталей деталей разнообразной формы толщиной до 4 мм и из пластичных цветных сплавов толщиной до 8 мм. Устройства с двумя камерами сгорания целесообразно использовать для штамповки деталей из малопластичных сортов алюминиевых, титановых сплавов и других труднодеформируемых сплавов. Двухкамерные устройства для листовой штамповки обладают широкими технологическими возможностями и могут быть эффективно использованы в мелкосерийных производствах для штамповки деталей различной формы We carried out the analysis of technological capabilities of two-chamber devices for sheet stamping with one and two combustion chambers. In devices with one combustion chamber, the stamping process is carried out in the cold state of the workpiece by the action of an elastic medium on it, using the kinetic energy of the piston accelerated by the combustion products of the gaseous fuel mixture. In devices with two combustion chambers, the stamping process is carried out with the heating of the workpiece by the action of the hot gas formed during combustion in the upper chamber of the pre-compressed fuel mixture. In this case, the mixture is compressed due to the energy of the combustion products formed in the lower chamber. We established that devices with one combustion chamber are expedient to be used for stamping parts of various shapes with a thickness of up to 4 mm and from plastic non-ferrous alloys with a thickness of up to 8 mm from ductile steels. Devices with two combustion chambers are advisable to be used for stamping parts from low-plastic grades of aluminum, titanium alloys and other hard-to-deform alloys. Two-chamber devices for sheet stamping have wide technological capabilities and can be effectively used in small-scale production for stamping parts of various shapes

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Experimental studies and theoretical analysis of the residual properties of three-span small-scale continuous concrete slabs after a fire

Fire Safety Journal ◽

10.1016/j.firesaf.2021.103481 ◽

2021 ◽

pp. 103481

Author(s):

Yong Wang ◽

Gongchen Wang ◽

Zhaohui Huang ◽

Yuner Huang ◽

Benmiao Wang ◽

...

Keyword(s):

Theoretical Analysis ◽

Experimental Studies ◽

Small Scale ◽

Concrete Slabs ◽

Residual Properties

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Investigation of the Effect of Incomplete Droplet Prevaporisation on NOx Emissions in LDI Combustion Systems

Volume 2: Turbo Expo 2007 ◽

10.1115/gt2007-27654 ◽

2007 ◽

Author(s):

Christian H. Beck ◽

Rainer Koch ◽

Hans-Joerg Bauer

Keyword(s):

Reaction Zone ◽

Liquid Fuel ◽

Experimental Studies ◽

Fuel Mixture ◽

Peak Temperature ◽

Small Scale ◽

Nitric Oxides ◽

Transition Range ◽

Practical Applications ◽

Combustion Systems

The influence of incomplete liquid fuel prevaporisation on the emissions of nitric oxides in a swirl stabilized model gas turbine combustor is investigated experimentally and numerically. The design of the model combustor enables the variation of the degree of prevaporisation. This is achieved by using two liquid fuel injectors. One injector is located far upstream of the flame and generates a fully prevaporized and premixed air fuel mixture. The second injector is located at the combustor inlet. Consequently, the liquid fuel mass flow split between the two injectors determines the fraction of non-prevaporized fuel present in the reaction zone. The NO/NO2 measurements were performed with a chemo-luminescence analyzer. In accordance to the findings of other workers, our experimental study revealed that the influence of prevaporization on nitric oxide emissions is of significance for practical applications. The experimental studies were accompanied by numerical studies of partially prevaporized lean combustion in an abstracted configuration. Purpose of this study is to gain detailed understanding of the influence of droplet slip on droplet flame position and peak temperature. The droplet slip velocity was found to have a significant impact on the peak temperature of the droplet flame and, therefore, NO formation rates within the droplet flame. The combustion system used for the experimental investigation was characterized regarding droplet slip velocities with an extended LDA technique. The comparison between numerical and experimental results shows that the droplet slip velocities in the macroscopic reaction zone are within the transition range from an envelope to a wake flame. It is concluded that small-scale mixing effects play a significant role in the formation of nitric oxides in spray combustion systems with incomplete prevaporization.

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Angular Rolling of the Hollow Flanges of Pipe Joints

Metals ◽

10.3390/met11010166 ◽

2021 ◽

Vol 11 (1) ◽

pp. 166

Author(s):

Pavel Kononov ◽

Sergey Ignatiev ◽

Dmitry Levashov ◽

Irina Kononova

Keyword(s):

Computer Simulation ◽

Experimental Studies ◽

Small Scale ◽

Scale Production ◽

Rolling Roll ◽

Pipe Joints ◽

Hardening Curve ◽

3D Software ◽

Rolling Technology ◽

Deform 3D

The paper considers a three-stage technology for angular rolling of the pipe workpiece. This technology facilitates the expansion of the range of flange parts available by eliminating a number of drawbacks of the known methods of metal forming. In the presented paper, we analyze the results of numerical calculations and experiments, as well as the effective deformation values in blank material, using computer simulation in the DEFORM-3D software package. The results of the computer simulation were reached taking into account experimental studies of the rheological properties of copper alloy L68 in the form of a strain hardening curve using the Instron-8850 complex. The results of the ratio of basic geometric dimensions expanded the range of flange parts under investigation and allowed us to consider angular rolling technology with a variable angle of inclination of the rolling roll from a three-stage perspective, especially in small-scale production.

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AGRICULTURAL PRODUCTION OF CA DONG PEOPLE IN RESETTLEMENT AREA OF TRANH RIVER HYDROPOWER NUMBER 2: CURRENT SITUATION AND IMPACT FACTORS

Tạp chí Nghiên cứu dân tộc ◽

10.25073/0866-773x/428 ◽

2020 ◽

Vol 9 (2) ◽

Author(s):

Bùi Thị Bích Lan

Keyword(s):

Social Relations ◽

Agricultural Production ◽

Large Scale ◽

Transition Process ◽

Impact Factors ◽

Small Scale ◽

Scale Production ◽

Technical Application ◽

Production Models ◽

Role Of The State

In Vietnam, the construction of hydropower projects has contributed significantly in the cause of industrialization and modernization of the country. The place where hydropower projects are built is mostly inhabited by ethnic minorities - communities that rely primarily on land, a very important source of livelihood security. In the context of the lack of common productive land in resettlement areas, the orientation for agricultural production is to promote indigenous knowledge combined with increasing scientific and technical application; shifting from small-scale production practices to large-scale commodity production. However, the research results of this article show that many obstacles in the transition process are being posed such as limitations on natural resources, traditional production thinking or the suitability and effectiveness of scientific - technical application models. When agricultural production does not ensure food security, a number of implications for people’s lives are increasingly evident, such as poverty, preserving cultural identity, social relations and resource protection. Since then, it has set the role of the State in researching and building appropriate agricultural production models to exploit local strengths and ensure sustainability.

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Study of Diabetic Mellitus and Knowledge of Lotion Foot Care on the Community

International Journal of Pharmaceutical Quality Assurance ◽

10.25258/ijpqa.v9i3.13659 ◽

2018 ◽

Vol 9 (3) ◽

Author(s):

Hariyadi DM ◽

Athiyah U ◽

Hendradi E ◽

Rosita N ◽

Erawati T ◽

...

Keyword(s):

Blood Glucose ◽

T Test ◽

Small Scale ◽

Scale Production ◽

Foot Care ◽

Diabetic Mellitus ◽

Glucose Levels ◽

Blood Glucose Levels ◽

Before And After ◽

History Of

The prevention of Diabetic Mellitus (DM) and its complications is the main aim of this study, in addition to the training of lotion foot care application and the development of small scale industry. The research team delivered knowledge in the form of training on Diabetic Mellitus, healthy food, treatment and prevention of complications, and small-scale production of cosmetic products. The aim of this study was to determine the correlation between training on diabetic and lotion foot care application as preventive measures against diabetic complications on the patient's blood glucose levels in the community of residents in Banyuurip Jaya, Surabaya. It was expected from this training that the knowledge of the residents increases and people living with diabetic undergo lifestyle changes and therefore blood sugar levels can be controlled. The parameters measured in this research were blood glucose levels, the anti diabetic drug types consumed, and compliance on diabetics. This study used the data taken from 60 patients with DM over a period of one month. Questionnaires and log books was used to retrieve data and changes in blood glucose levels in diabetic patients. The results showed the demographic data of patients with type 2 diabetic of 85% female and 15% male, with the range of patients aged of 61-70 years of 46.67% and had history of diabetic (90%). The history of drugs consumed by respondents was anti diabetic drugs such as metformin (40%), glimepiride (33.37%) and insulin (6.67%). In addition, the increased knowledge of DM patients after being given the training compared to before training was shown in several questions in the questionnaire. A statistical analysis using t-test analyzed a correlation between training provided in order to enhance understanding of the patient, as well as correlation with blood glucose levels. A paired T-test showed that there was a relationship between the knowledge of trainees before and after training (p less than 0.05). An interesting result was that there was no relationship between blood glucose levels before and after training provided (p> 0.05).

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Technical basis for the small-scale production of black soldier fly, Hermetia illucens (L. 1758), meal as fish feed in Benin

Journal of Agriculture and Food Research ◽

10.1016/j.jafr.2021.100153 ◽

2021 ◽

Vol 4 ◽

pp. 100153

Author(s):

Armel Gougbedji ◽

Pamphile Agbohessou ◽

Philippe A. Lalèyè ◽

Frédéric Francis ◽

Rudy Caparros Megido

Keyword(s):

Small Scale ◽

Fish Feed ◽

Scale Production ◽

Black Soldier Fly ◽

Hermetia Illucens ◽

Technical Basis

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Fabrication of Bulk Functionally-Graded Syntactic Foams for Impact Energy Absorption

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.711 ◽

2012 ◽

Vol 706-709 ◽

pp. 711-716 ◽

Cited By ~ 4

Author(s):

Tadaharu Adachi ◽

Masahiro Higuchi

Keyword(s):

Theoretical Analysis ◽

Energy Absorption ◽

Functionally Graded ◽

Fabrication Process ◽

Syntactic Foams ◽

Compression Tests ◽

Matrix Resin ◽

Local Fracture ◽

Density Distributions ◽

The Matrix

Function of functionally-graded (FG) foams as energy absorption material for impact was discussed on the basis of theoretical analysis, and fabrication process of the foams was proposed in the paper. The FG foams were found to be useful as impact absorber due to progressively local fracture or cushion in the theoretical analysis. Next the fabrication process of the FG foams was suggested. The graded dispersion of the micro-balloons was conducted before curing the matrix resin in the process. The density distributions in the FG foams were confirmed to be predicted by the numerical analysis on the basis of floating the micro-balloons. Finally, compression tests were carried out to evaluate mechanical properties.

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