Salah satu hal yang menjadi tolak ukur dalam menilai produktifitas dan efisiensi suatu industri adalah dengan melihat tingkat cacat produk yang terjadi dalam menghasilkan suatu produk. cacat produk yang sering terjadi antara lain, short moulding, warpage, sink mark, flow line, flashess, bubble, hole/gap, over moulding. Pada penelitian ini di kaji tentang pengaruh temperatur dan tekanan pada mesin injeksi moulding berbahan plastic jenis (pvc compound),dengan melakukan analisa penyebab cacat produk berdasarkan parameter temperatur dan tekanan pada barrel, Tujuan dari penelitian ini adalah untuk meminimalisir cacat produk yang dihasilkan mesin injection moulding dan mendapatkan setting parameter moulding yang tepat, Metode yang akan dilakukan yaitu memvariasikan setting termperatur dengan variabel bebas yaitu 150oC, 170oC, 190oC dan variable bebas pada tekanan 60 Mpa dan 100 Mpa, di lakukan proses secara bertahap sebanyak 3 kali running mesin dalam satu kali setting parameter untuk memastikan berapa banyak cacat produk. Dari hasil pengaturan parameter mesin injeksi moulding telah ditemukan parameter yang optimal dengan cacat produk yang paling sedikit pada variasi temperatur 170oC dan tekanan 60 MPa.
SKD 11 steel is a tool steel which is often applied in the manufacturing industry, such as cutting, punching, stamping tools, shear blades, dies and others. And in it’s application, of course steel must have a hard structure, strong and touhgness affected due to external forces causing deformation or change in shape. To improve the quality, heat treatment is required on the steel by providing austenizing, quenching and tempering temperature variations 400 °C, 550 °C and 650 °C. Which purpose to determine the hardness and microstructure of the tempering variation results. The first step of cutting material SKD 11 steel, followed by austenizing process up to 1050 °C and then quenching process (fast cooling) with medium water and continue the process of tempering variation 400 °C, 550 °C and 650 °C. After the heat treatment was complete, take hardness test and view the microstructure of the SKD 11 steel. At temperatures tempering 400 °C showed the highest hardness value of 56.5 HRC, followed by tempering temperatures 550 °C at 52.9 HRC and the lowest occurred at temperature tempering 650 °C at 39.1 HRC. Microstructure formed pearlite and martensite. Then the higher temperature tempering then the declining value of steel hardness SKD 11.
The Batam industry materials are steel, an alloy material between iron and carbon, and a few other elements. Low-carbon steel is one type of metal. However, this low-carbon steel has the disadvantage of corrosion resistance, mainly if applied to corrosive environments. In the utilization of Low carbon steel in the industry, corrosion can cause problems and cost a lot of money in its maintenance. Chitosan contained in invertebrate animals is predicted to be able to prevent corrosion as an inhibitor. This study aims to analyze the optimal conditions of chitosan inhibitors against the corrosion rate of low-carbon steel in environments with variations in the length of immersion of specimens in corrosive media. This study is a true-experimental study with a pre-post-test design. The determination of the optimal conditions of corrosion inhibition of low-carbon steel plate specimens by chitosan was carried out with variations in the parameters of HCl concentration, specimen immersion time, and chitosan concentration. The analysis carried out is the measurement of specimen weight loss in each parameter by determining the difference in weight before and after the experiment and determining the efficiency of the inhibitor. The experiment’s results showed that the optimal conditions of inhibition of corrosion were at 1M HCl, 400ppm chitosan, and a soaking time of 3 days with an efficiency of 48%. The efficiency value of this optimum corrosion inhibition of chitosan in low-carbon steel is 48%. To improve the efficiency of corrosion inhibition, it is necessary to further research with higher accuracyTo determine the effect of inhibition of corrosion using chitosan on the quality of steel surfaces, it is necessary to analyze the steel surface structure using ultrasonic testing or using XRD Analysis.
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