This study discusses the phenomenon of spring-back and spring-go in the bending kinematic shaping process using V-bending dies and SGCC galvanized steel sheet (JIS G 3302) material. During the bending process, the zinc layer on the surface of the galvanized steel must not be damaged. The zinc coating on galvanized sheet steel will affect the material forming process (metal forming process). This study employed an experimental design with four input variables: die opening L (mm), punch angle (punch engel), punch speed (punch speed), and bending force (force bending). The input factors for the experiment are 35 mm opening, 40o punch angle, 30 mm/minute punch speed, and 7500 N bending force. In the die opening setting conditions, the maximum spring-back angle is 35 mm, the punch angle is 40 °, the punch speed is 30 mm/minute, and the bending force is 6500 N. The average minimum and maximum spring-back angles in this condition are 0.71o and 4.08o, respectively. The bending force is 7000 N, the punch angle is 50 °, the punch speed is 40 mm/minute, and the minimum spring-go angle is 30o. In die opening parameters, the maximum spring-go angle achieved is 35o, the punch angle is 60o, the punch speed is 50 mm/minute, and the bending force is 700 N. The average minimum and maximum spring-go angles are 1.90o and 6.23o, respectively.
This article present the optimization work describes out to joint the dissimilar galvanized steel of SECC-AF (JIS G 3313) and SGCC (JIS G 3302) material. A zinc coating on the surfaces of the galvanized steel sheets will decrease the weldability characteristic of the material. This study used dissimilar galvanised steel sheets to obtain the highest tensile shear strength from the specified resistance spot welding. This research used the Taguchi method with 4-variables and mixed-experimental levels. The mixed-experimental level, namely 2-experimental levels for the first variable and 3-experimental levels for other variables. The highest tensile shear strength was achieved in 5282.13 N. This condition is achieved at a squeezed time of 20 cycles, 27 kA-welding currents, welding time of 0.5 seconds, and holding time of 18 cycles. The S/N ratio analysis has shown the welding current had the most significant effect, followed by welding time, squeeze time, and holding time. The delta values of S/N ratio were 0.79, 0.64, 0.26 and 0.07, respectively. The ANOVA analysis has shown that the P-value of welding current and welding time is 0.006 (0.6%) and 0.015 (1.5%), respectively. This result is expected for optimizing resistance spot welding quality in other materials or significant aspects.
This article reports on technological mastery assistance in three small metal forming industries in Indonesia. Problems in the blangking and piercing separately process caused increased production time which resulted in inefficiency cost. Therefore, the expert team aided in metal forming technology through participatory action research (PAR) methods and experimental methods through reverse engineering for several products. The PAR method involves optimal contribution and participation from the industry. Assistance in mastering technology in small metal-forming industries reduces the manufacturing process from seven to three stages, increasing efficiency. The press machine's tonnage capacity must balance with the force blanking/piercing requirement. The minimum press machine requirement is 6.7 tons, and based on the availability of existing press machines, the expert team recommends a 20-ton capacity press machine. Total efficiency can be further increased by implementing full progressive die technology by combining piercing, blanking, and bending processes.
Article history :XYZ is a company engaged in the paper industry, which is located in West Java. Since established in 1976, this company has produced photocopy paper in the form of reams. This company has advantages in terms of paper quality so that its products dominate the international market and the domestic market. With a very tight level of market competition, companies must continue to work optimally to continuously improve employee performance and company productivity. The purpose of this study is to plan an incentive-based employee wage system, which is suitable and in accordance with company conditions. Incentive wages are important as one of the main components to increase and maintain motivation, performance and work integrity. This research was conducted in the Finishing Department of the copy manual wrapping work unit. The method used are the Piecework method, the Halsey method, and the Rowan method. The result of this research is a comparison of the amount of wages between the wage system used by the company and the three methods of incentive pay as a company alternative. From the comparison of the three incentive wage design methods, the authors recommend the Halsey method as the best method that is able to provide benefits for both the company and for workers which we call dual mutualism. The Halsey method still guarantees a basic wage and a decent incentive wage for workers as a motivation to work faster and better.
AbstrakPenelitian ini bertujuan untuk mengembangkan perangkat pembelajaran berupa RPP dan LKS dengan pendekatan problem based learning yang mengacu pada learning trajectory dan berorientasi kepada kemampuan penalaran matematis siswa. Jenis penelitian ini adalah penelitian pengembangan dengan model ADDIE yang terdiri dari Analysis, Design, Development, Implementation, dan Evaluation. Berdasarkan hasil penilaian kevalidan, RPP memenuhi kriteria sangat valid dengan perolehan skor 4,27 pada skala 5, sedangkan LKS memenuhi kriteria valid dengan perolehan skor 4,05 pada skala 5. Berdasarkan hasil penilaian kepraktisan, perangkat pembelajaran memenuhi kriteria sangat praktis dengan perolehan skor angket respon siswa 3,38 pada skala 4 dan angket respon guru 3,73 pada skala 4. Berdasarkan penilaian keefektifan dari tes kemampuan penalaran matematis diperoleh nilai rata-rata kelas yaitu 88 dan siswa yang memperoleh nilai minimal pada kategori “baik” sebesar 91%. Keefektifan perangkat pembelajaran pada kemampuan penalaran matematis didukung oleh one sample t-test dengan taraf signifikansi 0,05. AbstractThis research aims to develop mathematics learning material that includes lesson plan and student worksheets based on problem based learning approach and learning trajectory with an orientation on students’ mathematical reasoning skill. The present study is a development research using ADDIE model, consisting of Analysis, Design, Development, Implementation, and Evaluation. Based on the result of validation assessment, the lesson plan is “very valid” with a score of 4.27 on a scale 5, while validation assessment of student worksheets is “valid” with score 4.05 on scale 5. Based on the result of practicality, learning material is “very practical” with 3.38 on a scale 4 of student questionnaire and 3.73 on a scale 4 of teacher questionnaire. Based on the effectiveness assessment using mathematical reasoning student’s skill test, the average score of the class is 88 and 91% of students have minimum mathematical reasoning skill in the “good” category. The effectiveness of the learning material on mathematical reasoning student’s skill is also proved by one sample t-test with level of significant 0.05.
This paper presented the test of cup drawing, and the tensile ability of tailor welded blanks (TWBs) used to join the resistance spot welding a variety of different parameters. This study used SPCC-SD (JIS 3141) material with a material thickness of 1.0 mm and 1.2 mm. This research is focused on obtaining the highest tensile-shear strength of resistance spot welding and how it affects the results of the drawing cup process. This study used an experimental research method using six samples of RSW parameters. RSW parameters used are welding current, welding time, and squeeze time. This research was achieved the highest tensile-shear strength value of 5.09 kN and the lowest 4.15 kN which was achieved in the 5th and 1st samples respectively. The results of the cup drawing test using RSW parameters in the 5th and 6th samples showed no TWB failure in the welded area. Further research will be carried out by performing Taguchi optimization using RSW and TWBs parameters in the cup drawing process.
The aims of this research is to study and analysis on furnace walls with variation of hot face lining material types, variation of refractory material types, and variation of thickness of insulating materials to outer wall temperature at furnace with working temperature 1000 oC. This research uses a variety of hot face lining material in the form of ceramic fiber blanket with CR1260, CR1400, and CR1430, variations of refractory material in the form of refractory brick with the type NJM-20, NJM-23, and NJM-26, and using ROCKWOOL as an insulating material with a thickness variation of 50 mm, 75 mm, 100 mm. This research was simulated using Steady State Thermal ANSYS Mechanical (ANSYS Multiphysic) software. The result of the research shows the difference of the outer wall temperature value of the furnace. The highest wall temperature is in interaction with the wall without insulation, hot face lining material using CR1260, and NJM-26 as refractory material is 75.211 oC. While the lowest wall temperature is in the interaction of 100 mm thick insulation, hot face lining material using CR1430, NJM-20 as refractory material is 46.682 oC.
Untuk melindungi masyarakat miskin dan rentan dari dampak pandemi pemerintah telah merancang beberapa program jaminan perlindungan sosial. Salah satunya adalah Bantuan Langsung Tunai Dana Desa (BLT-Dana Desa), yaitu bantuan keuangan yang bersumber dari Dana Desa dan ditujukan bagi masyarakat miskin dan rentan yang kesulitan dalam memenuhi kebutuhan hidupnya sehari-hari terutama akibat wabah. Metode simple additive weighting dipilih karena metode ini menentukan penilaian kriteria keluarga penerima manfaat berdasarkan kriteria dari pihak desa, kemudian dilanjutkan dengan proses seleksi sehingga menghasilkan perangkingan. Perancangan sistem pendukung keputusan ini menggunakan pendekatan berorientasi kepada objek yaitu dengan menggunakan Unified Modelling Language (use case diagram, activity diagram, class diagram dan sequence diagram).Dengan metode simple additive weighting yang terkomputerisasi bisa menjadi solusi bagi aparat desa untuk menentukan penerima bantuan langsung tunai dana desa.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.