The Pocketed orifice structure for the air-nozzles of an aerostatic bearing is usually a particular pocketed orifice. This structure can not help the shaft to reach high stiffness in working process, so the applicability of the aerostatic bearing in machines with large centrifugal or horizontal foree is not focused.

 7 p hcmute 07/06/2019 435 2 Download

Chromium plating is used widely in industry to enhance wear, abrasion resistance and to restore the dimensions of undersized parts. However, tensile residual stress always exists in chrome layer because of hydrogen embrittlement so it affect to mechanical properties of the chromium plating machine element, especially in fatigue strength. In this paper, effect of residual stress in chrome plating layer to fatigue strength was studied. The...

 8 p hcmute 07/06/2019 388 2 Download

As known, the aim of this paper is to present the field hysteresis behavior of a BMR actuator via identifying the hysteresis model. In order to realize this purpose, firstly, a BMR actuator is manufactured. The feature of this actuator has two disks which are rotated in opposite direction at the same speed and two coils are placed directly on each side of the housing. The two input signals consisting of velocity and current are applied to the...

 7 p hcmute 07/06/2019 353 2 Download

In the traditinon mold manufacturing process, manual methods are mostly used to design, fabricate and then perfrom forming test to find out the reasonable processing mode for the product. Thanks to the development of technology, the forming design can be greatly reduced by using commercial software.

 7 p hcmute 07/06/2019 353 2 Download

The characteristics of the cylindrical roller bearings are capable of withstanding radial load due to the rolling rod and the rollers of bearings being in direct contact. These types of bearings are suitable for applications with high radial load and dynamic loads.

 8 p hcmute 07/06/2019 471 2 Download

For electronic packaging, nowadays, numerous investigations have so far been dedicated to the determination of solder joint's mechanical properties such as their creep response under thermo-mechanical loading. There are a broad variety of experimental devices and techniques that researchers have employed for the studying of different types of solders. Indeed, conventional techniques used for characterization include tensile and compressive...

 9 p hcmute 07/06/2019 289 2 Download

The aim of this paper is to present the simulation and experiment of the welking butt-joint aluminum alloys to low carbon steel using Visual-weld software and the metal inert gas (MIG) welding process. The workpiece is set up in a virtual environment with an area of 150 x 70 x 5 mm, a welding speed at 3.5 mm/s, and a heating source of 2.5 kW.

 9 p hcmute 07/06/2019 474 2 Download

Continuous inprovement is a protential requirement of any competitive organization especially on productivity and quality. Lean six sigma is knows as the useful and popular tool of industrial engineers. In this paper, a systematic way to apply in a practice case study would be presented.

 9 p hcmute 06/06/2019 510 4 Download

The tensile and bending properties of composite materials with geopolymer matrix reinforced by layers of basalt plain weave fabric were investigated experimentally. We present the results of the quasi-static tensile tests and the quasi-static and cyclic three-point bending tests. The composite panels were made by hand laying with subsequent vacuuming. The plates were stayed in a compression press and left in a compressed state for a month....

 5 p hcmute 06/06/2019 387 2 Download

The largest problems for small wind turbines, operating at low wind speed includes the unstable wind conditions and the generation of laminar flow separation and laminar separation bubbles on the wind turbine blades due to the low Reynolds ( Re ) number. Thus, the power coefficient ( Cp ) of small wind turbines is lower than the Cp of large wind turbines. Using and comparing among four airfoils, consisting of SD7062, SG6043, S809 and E387,...

 9 p hcmute 06/06/2019 329 2 Download

Strong texture microstructure of JIS S45C rolled steel is disadvantage for cutting process. To improve the mechancial properties during the cutting process, heat treatment to remove the strong texture should be done. The experimented results at the heat treatment facilities and laboratories show that the texture seems to remain by the common crystallization annealing process.

 8 p hcmute 06/06/2019 409 2 Download

Medium-sized cylindrical grinding machines are used for semi-fine machining and fine machining of cylindrical parts wwith suitable harness. Stability of the center spindle grinding machine during machining has a decisive influence on the surface quality of the workpiece. One of the main indicators of the stability of the spindle is it stiffness in the machining process. The spindle of grinding machine is supported by hydronamic bearing with...

 9 p hcmute 06/06/2019 363 2 Download