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Design and Manufacture Specialized Fixture for Manufacturing Process Reduction Gear Housing of Fork-lift Truck

Pham Thi Hang, Ngo Dang Huynh, Bui Van Bac

Received: 19-03-2013 / Accepted: 20-06-2013
Reduction gear housing of fork-lift truck is a machine part having complex structure. Thus, we cannot use available fixture during manufacturing process. Designing and manufacturing a specialized fixture is a requirement. In this study, it is aimed at designing specialized fixture based on drawing of gear housing; its technical and technological requirements and designing manufacturing process this fixture. The designed fixture has main parts is bearing plate, two bolster plates, collet chuck. The manufacturing process includes manufacturing bearing plate, bolster plates and collet chuck, thermal treatment, checking process and assembly. Checking and using test results show that designed fixture is reasonable and manufacturing process reaches technical requirements.
RestoringShaft of Stone Sawing Machine Using Build- Up Welding Method

Tong Ngoc Tuan, Le Van Tuan

Received: 04-04-2015 / Accepted: 12-07-2016
The shaft of stone sawing machine in working process often occurs faulty. Common form of fault is the wornnessover limited dimension at the center shaft. One of the methods that brings high efficiency andmeeting in time for manufacturing might berestoration of theshaft using build- up welding methodtoachieve the desired dimension. Based on theoreticalresearch onwelding technology, shielded metal arc welding for building- up weldwas selected. This is one of the methods that can be easily usedwith availableequipments. Equipmentselection, welding condition, manufacturing process, manufacturingcondition, andqualityevaluation were done to ensuregood operation after machine assemblage. Different equipmentswere used to test the shaft forroughnessandhardnessand the shaft quality was checked by operation trials. Fivesamples wereselected forrestoration and quality evaluation. Relying on all evaluating methods, all shafts have good quality.
Designing A 3-Roller Sheet Bending Machine Suitable for Requirements of Small Production Operations

Nguyen Huu Huong, Tong Ngoc Tuan

Received: 21-03-2018 / Accepted: 11-06-2018
Calculation and design for a 3-roller sheet bending machine for small production operationswere based on theoretical studies and real manufacturing practices. Dimension parameters of the machine were calculated based on materials used in manufacturing process and machinery parts. The bending machine can manufacture machinery parts with different diameters and heights by using some types of steel with thickness from 1 to 4 mm, length from 400 to 2000 mm and width from 50 to 800 mm. Based on design drawing, a 3-roller sheet bending machine was manufactured and used for manufacturing machinery parts.
Design and Manufacture Some Main Details of Metal Bending Machine

Nguyen Thi Thu Trang, Nguyen Ngoc Cuong, Nguyen Huu Huong

Received: 10-12-2019 / Accepted: 11-02-2019
Metal bending machine is a research result based on existing equipment and the use of engineering design software combined withtheexperimental works. Fabrication of this machine aimsto process many different types of parts from sheet metal billet by folding bending method. It can easily change of mold size and shapeaccording to the detailed machining requirements. The principle of deformation process is to use the punch and die to bend the blank of the sheet to create angles for the part. Bending machines are suitable for small production facilities or for practical training for students in mechanical technical training institutions. The technological parameters of the machine are calculated and selected based on the scope of the research and the purpose of processing detailed deformation.
Simulation Results by Eta/ Dynaform Software for the Shapingofsome Details of Agricultural Machines Produced with Sheet Metal Forming Technology

Nguyen Thi Thu Trang, Pham Thanh Cuong, Tran Van Huu

Received: 14-09-2018 / Accepted: 06-12-2018
The present study used numerical simulation method by Eta/ Dynaform software as the basis for the analysis and evaluation of metal deformation process. This restrictsand overcomesthe errors that may occur during manufacturing, saving the time of moldingandfabrication details, saving materials,reducingthe price, and improvingthe quanlity of product after stamping. Based onsimulation problem on the deformation process of some typical partsin agricultural machines from sheet metal, optimal technologicalparameters for shapingwere proposed. On this basis, it is possible to apply virtual technology into production of equipment,machines and products in engineeringin general and agricultural engineering in particular.
FDI INFLOWS INTO VIETNAM AFTER JOINING THE WTO

Hoang Chi Cuong

Received: 10-04-2012 / Accepted: 05-08-2012
Foreigndirect investment (FDI) has taken a crucial role in Vietnam’s development processsince the launch of Renovation in 1986. After Vietnam’s accession to the World Trade Organization (WTO), a large amount of FDI capital flowed into country, up to 140 billion USD, due to the openness of country’s economy, more transparent, predictable investment environment, and several national advantages. Wherein, there was a switching of FDI capital from manufacturing sector to service one together with a downward trend in agriculture. Like previous duration, Vietnam’s FDI capital sources came mostly from Asia-Pacific region and European economies (net capital, technology exporters) probably caused by Vietnam’s integration emphasizes in dynamic Asia-Pacific region. Another interesting finding was that, geographical allocation of FDI was characterized by concentration on three main key economic regions: the Red River Delta (surrounding Ha Noi, Hai Phong, and Quang Ninh), the Central region (surrounding Da Nang), and the Southeast of country (surrounding Ho Chi Minh City) owing to better infrastructure, abundance of skillful labor force, and bigger market size. To use/attract FDI capital more effectively and enhance the role of FDI in Vietnam’s development process, some suggestions were also proposed.
Phisical Model of the Vertical Cone-Shaped Screw Mixer

Luong Thi Minh Chau

Received: 29-01-2016 / Accepted: 10-06-2016
Physical model built for the vertical cone-shaped screw mixer consists of two physical models to determine the capacity and productivity of the vertical cone-shaped screw mixer. Based on the physical models we built vertical cone-shaped screw mixers identical with that of optimum parameters. Research process for the different machine models to raise productivity in calculating, design, manufacturing can be shortened but vertical cone-shaped screw mixers with optimal work fitting to the different power and productivity could be achieved.
The Linkages between Farmers and Enterprises in the Production andConsumption of Coffee in the Central Highlands

Do Thi Nga, Le Duc Niem

Received: 10-08-2016 / Accepted: 17-11-2016
In this article, secondary data as well as primary data collected from households and businesses were used to evaluate real status and effectiveness of cooperation models between farmers and business enterprises in production and trading of coffee in the Central Highlands. Based on the analysis, we proposed measures to enhance sustainable linkages between the two actors in production and trading of coffee in the investigated region. The research findings indicated that these linkages help improve economic efficiency in households’ coffee production thanks to increased productivity, higher price, and manufacturing cost savings and improve the competitiveness of businesses (thanks to the stability of raw materials, and a source high quality coffee for exportation). However, there are many limitations and challenges to maintain or develop these current linkages, particularly in the production process, product sales, or access to supportive policies. Thus, in order to promote sustainable linkages between farmers and businesses in the production and trading of coffee, it is suggested to enhance the capabilities of farmers, encourage support for farmers from businesses, improve market development activities in business, and suitable subsidies from the Goverment.
In VitroEffects of Minerals on Sporulation and Heat Resistance of BacillussubtilisCM3.1

Pham Thi Tuyet Ngan, Vu Hung Hai, Huynh Truong Giang

Received: 29-03-2023 / Accepted: 05-10-2023
This study sought to evaluate the in vitro effects of minerals, including calcium (Ca2+),potassium (K⁺), manganese (Mn2+),magnesium (Mg2+) and iron(Fe2+) on sporulation efficiency and heat resistance of BacillussubtilisCM3.1. Sporulation of Bacillus cells was induced in sporulation medium supplemented with various concentrations of the minerals. 7 days after inoculation, Ca2+(1mm), Mg2+(3mm), Mn2+(1mm) and Fe2+(1mm) as single supplements into Nutrient Broth (NB) significantly increased spore cell density of BacillussubtilisCM3.1, except for K+(10mm). Furthermore, the spore cell density and viability of Bacillus were detectable in sporulation media such as m-NB, SSM and m-SM, significantly higher compared to those in NB (P <0.05) after heating periods, especially from 30 to 40 minutes of exposure. Our results could provide better understanding of the importance of minerals supplemented into culture medium in improving the density, heat resistance of Bacillus spore, and thus enhancingthe stability of probiotic Bacillus subtilis CM3.1 during manufacturing process and storage time.
Design and Fabrication of Sectional Screw Flight Bending and Forming Machines

Nguyen Huu Huong, Tong Ngoc Tuan, Nguyen Thi Thuy Hang

Received: 21-02-2020 / Accepted: 29-06-2021
The goal of this study was to design and fabricate sectional screw flight bending and forming machines for manufacturing screw flights applied in real production. This machine was designed to be suitable for small production scale. The principle of the machine was calculated and chosen based on theoretical research and the structure of current mechanics. Autodesk Inventor software was utilized for designing mechanical parts and components and assembling the slicer. Based on the drawing, this machine was fabricated using available materials. The operating process of this machine shows that the machine can form screw flights made from the metal plates with a maximum thickness of 3 mm. In addition, the machine could form a metal plate draft approximately 150 mm in width. Some experiments indicate that this machine worked relatively well.

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