Accurate: Journal of Mechanical Engineering and Science

Desain dan Perancangan Alat Welding Holder untuk Pengelasan Pelat pada Las GMAW

2023-07-31T00:06:51+07:00

One of the metal welding processes required by the manufacturing industry is gas arc welding (GMAW). The welding process that is capable of transmitting large amounts of heat at high speeds is gas electric welding or GMAW (Gas Metal Arc Welding). The design mechanism for the movement of the X and Y axes in the development of GMAW welding holders uses the stages of finding ideas, studying literature, identifying problems, designing, making tools and testing machines. The purpose of this study was to design a mechanism for moving the X and Y axes in the development of an automatic GMAW torch holder machine and to calculate the machine elements in the development of an automatic GMAW torch holder machine.

The process of designing and constructing the movement of the X and Y axes in the development of an automatic GMAW welding torch holder machine is carried out with a design procedure that is used as a reference in solving problems. The track shaft uses chrome steel with a diameter of 25 mm and a length of 800 mm, Linear bearings use type SCS25UU with an inner diameter of 25 mm, Linear rail shafts use aluminum alloy material with a diameter of 25 mm which is used to support the end of the track shaft, Ballscrew uses the SFU 2005 type with a size of 3/4 inch which is equipped with a ballscrew nut and also a nut housing, Bearing block uses a UCP type with a diameter of 20 mm, Flexible coupling measuring 5 mm to 10 mm is used to connect the drive screw with the stepper motor, The stepper motor is used as the main power to drive the drive screw type Nema 17 (17HD48002H-22B) with the specifications Step Angle: 1.8o, Rated Current: 1.5 Ampere, Voltage : 2.7V.

Analisis Daya Serap Suara Material Berbasis Polyester Staple Fibre Untuk Karpet Lantai Kendaraan

2023-07-27T00:59:25+07:00

This research studies about the ability of the acoustic properties or absorption of the vehicle floor carpet material which consists of several forming components, with an experimental method using the tube impedance method. The components of this car floor carpet material consist of a skin section which includes a surface made of polyester staple fiber plastic fiber, binders made of latex SBR material, backing made of Polyethylene (PE) powder and the under layer made of Polyester Fiber material (PET) Silencer. The carpet material for the vehicle floor was made into three samples to determine the average of sound absorption coefficient. The sound absorption coefficient was obtained from testing the flat test sample using the ASTM E1050-98 tube impedance method. The use of Polyethylene (PE) powder as a backing for floor mats has a sound absorption coefficient with a rating of B (above 0.8) at a frequency of 3,000 Hz. While the sound absorption coefficient reaches the highest point of 0.99 at a frequency of 3,000 Hz. This is because the backing with Polyethylene (PE) powder material has porous holes. The micro surface is used as a layer of air space so that it can effectively reduce and increase the absorption of sound that occurs inside the vehicle when driving. The sound absorption coefficient of vehicle floor carpet increases significantly at low frequencies and slightly decreases at high frequencies

Pengaruh Variasi Holding Time pada Proses Pack Carburizing dengan Arang Tempurung Kelapa Barium Carbonat Terhadap Sifat Fisik dan Mekanik Baja ST 42

2023-08-05T13:46:00+07:00

Iron-based production machine components are chosen to support productivity. Steel is a metal material that is easily found on the market, but it has not fulfilled the desires of consumers in the market. This steel can be hardened by heat treatment (heat treatment). The surface treatment process is carried out to obtain the desired hardness, this can be done by increasing the carbon (C) element in the steel material, the carbon content in the standard steel structure is 0.3% - 0.59% the carbon content will have an effect. on hardness, one way to increase the element carbon (C) in steel and increase the hardness on its surface is by carburizing. This research will examine the hardness level of low carbon steel by using a pack carburizing process with different times of 2; 2.5 and 3 hours and the quenching process with pure water media.. The purpose of this study was to determine the effect of holding time on the pack carburizing process with coconut shell charcoal - barium carbonat on the hardness value of ST 42 steel. Besides that for effect of holding time on the pack carburizing process with coconut shell charcoal on the microstructure. There are differences in the surface hardness and microstructure values before and after the carburizing process. Where the highest hardness value occurs at a holding time of 3 hours with a hardness value of 872.9 HVN or an increase of 382% of the raw material and is supported by the dominance of the martensite phase which is more and more evenly distributed. Compared to the ST 42 steel raw material before the pack carburizing process was carried out, the hardness value was 174.8 HVN. A dominant microstructure consisting of a ferrite phase and a little bit of pearlite dominance.

Desain dan Analisa Perhitungan Rem Cakram Pada Mobil Sport Utility Vehicle (SUV)

2023-08-10T09:55:03+07:00

Brakes are an important component in a vehicle unit, so it is necessary to have proper planning in the design and manufacture process. The purpose of this study is to design disc brakes on a Sport Utility Vehicle (SUV) car with consideration of the results of the calculation analysis based on the specifications of the reference car. The resulting design is in the form of main components which include calipers, pistons, discs, pads, rivets, pins and bolts. Based on this design, the calculation results show the braking process when a car traveling at a speed of 245 km/h can stop at a braking distance (s) of 42 m with a braking time 4 seconds. The next research is to make a mathematical model to optimize the dimensions of the brake components needed at the ideal braking distance.

Studi Kelayakan Produksi Briket dari Kayu Karet dan Sekam Padi Sebagai Upaya Diversifikasi Energi Berkelanjutan

2023-08-16T01:51:53+07:00

This research aims to evaluate the feasibility of producing briquettes from rubber wood and rice husks as a step towards sustainable energy diversification. Qualitative and quantitative analyses were conducted on the raw materials, considering their physical and chemical properties as well as calorific values. The production process involves drying, grinding, mixing, compacting, and forming using simple technology. Feasibility study results show positive attributes of the briquettes, with low ash content at 1%, high calorific value at 5016 kJ, and low moisture content at 0.9%. Briquettes offer potential as clean and efficient energy sources. Economic analysis reveals an NPV of IDR 407,729 and an IRR of 20%, surpassing the 12% case of capital rate. Overall, this briquette production signifies a viable and sustainable energy diversification effort, contributing to environmentally friendly energy source development.