Search

Animal feed knife is a tool that serves to cut and chop animal feed consisting of grass as the main ingredient with additives such as bran, herbs, centrate, cassava, tofu pulp and others. Therefore, as a cutting tool must have the properties of friction resistance, impact resistance, and have good sharpness, so that the material chosen is Ni-Hard 1. The use of centrifugal casting method was chosen because it has the advantage of being able to make castings with relatively thin thickness this is due to the influence of the centrifugal force on the distribution of metal liquids throughout the cavity in the mold. Case study in this study is the use of centrifugal casting methods as an alternative to gravity casting methods to overcome defects of misruns. This research was conducted to investigate the effect of speed on the formation of castings products. The method that was carried out began with a literature study on centrifugal casting, and continued by determining the material, the temperature of the cast is in the range 1250ºC - 1300ºC, and the type of mold. The next step is to do work drawings, pattern making, mold making, casting processes, fettling processes, and analysis. With variations in speed of 200 rpm, 300 rpm and 400 rpm, it can be seen the optimal speed for making this product. The results of this study obtained optimal speed at a speed of 300 rpm to make good quality of animal feed knife products., Pisau pakan ternak adalah alat yang berfungsi untuk memotong dan mencacah pakan ternak yang terdiri dari rumput sebagai bahan utama dengan aditif seperti dedak, ramuan, sentrat, singkong, ampas tahu dan lainnya. Oleh karena itu, sebagai alat pemotong harus memiliki sifat ketahanan gesek, ketahanan benturan dan memiliki ketajaman yang baik, sehingga bahan yang dipilih adalah Ni-Hard 1. Penggunaan metode pengecoran sentrifugal dipilih karena memiliki keunggulan yaitu mampu membuat coran dengan ketebalan yang relatif tipis. Hal ini disebabkan oleh pengaruh gaya sentrifugal pada distribusi cairan logam di seluruh rongga cetakan. Pada penelitian ini penggunaan metode pengecoran sentrifugal sebagai alternatif metode pengecoran gravitasi untuk mengatasi cacat produk cor. Penelitian bertujuan untuk mengetahui pengaruh kecepatan putar pada pembentukan produk cor. Metode yang dilakukan dimulai dengan studi literatur tentang metode pengecoran sentrifugal dan diilanjutkan dengan menentukan bahan, suhu gips berada di kisaran 12500C – 13000C serta jenis cetakan. Langkah selanjutnya adalah mengerjakan gambar kerja, pembuatan pola, membuat cetakan, proses pengecoran, proses fettling, dan analisis. Dengan variasi kecepatan 200 rpm, 300 rpm dan 400 rpm, dapat dilihat kecepatan optimal untuk membuat produk ini. Hasil penelitian ini menunjukkan kecepatan optimal pada kecepatan 300 rpm untuk membuat produk pisau pakan ternak berkualitas baik.

The shell molding method is one of the processes of coating sand grains in a thermo setting resin which preserves heat on the model. To produce castings products that have good quality and produce maximum mechanical properties from the shell molding process, it must be known that the right procedure stages such as the right heating time. But currently there is no technical procedure that is found that is the right temperature and heating time for making shell molding to produce good surface quality of castings. This study aims to determine the effect of temperatures and heating time on the mechanical properties of RCS (resin coated sand) and the quality of the object castings. A series of testing methods, carried out by heating the RCS on the sample mold bending and hardness test. Testing the mechanical properties of sand includes bending test and hardness test. The time variations used in sand heating are 1 minute, 2 minutes and 3 minutes with temperature variations of 1800C, 2000C, 2200C, 2400C, 2600C and 2800C. After knowing the results of the most optimal temperature and time from testing mechanical properties then making molds using the shell molding method, the molding material used is aluminum. The mold formed from the shell molding method is then cast using NiHard1 material with a temperature of 14000C. The results of the castings will be identified visually and compared with the mechanical properties of the sand obtained. The results of this study obtained the highest value on the graph of the results of mechanical properties testing at a temperature of 2200C with a heating time of 2 minutes. The results of castings best viewed in terms of visual obtained by heating time for 2 minutes and 3 minutes at a temperature of 2200C. This showed that the heating time for 2 minutes and 3 minutes at the temperature of 2200C results in the highest mechanical properties and the best quality of castings for shell molding method.

Penelitian ini bertujuan untuk menganalisis uji kekerasan dan uji tarik pada material AISI P20 Mod. setelah melalui proses hardening dan tempering pada suhu yang berbeda-beda. Hardening adalah proses perlakuan panas yang diterapkan untuk menghasilkan benda kerja yang keras. Proses tempering bertujuan untuk memperoleh kombinasi antara kekuatan, keuletan dan ketangguhan yang tinggi. Material AISI P20 Mod. sebagai material substitusi impor yang diproduksi melalui proses continuous casting dimana dalam proses pembuatannya memerlukan proses rol (rolling) dan proses tempa (forging). Material ini mempunyai sifat dan karakteristik khusus, diantaranya tahan terhadap temperatur tinggi, tahan terhadap abrasi, dan mempunyai mampu mesin yang baik. Hasil penelitian menunjukkan uji kekerasan pada proses hardening mencapai nilai kekerasan 53,7 HRC. Selanjutnya dilakukan proses tempering pada suhu 200C hasil menunjukkan nilai kekerasan sedikit meningkat menjadi 54 HRC, sedangkan pada temperatur 400C terjadi penurunan nilai kekerasan menjadi 47,4 HRC. Baru setelah dilakukan tempering pada suhu 600C hasil uji kekerasan menunjukkan masuk target kekerasan yang diinginkan yaitu pada 34 HRC. Hasil uji tarik menunjukkan pada kondisi awal benda, hasil uji tarik adalah 655N/mm 2 . Kekuatan tarik hasil proses hardening sebesar 1244 N/mm 2 . Setelah dilakukan proses tempering 200 0 C dihasilkan kekuatan tarik 1515.8 N/mm 2 . Pada proses tempering 400 0 C, terjadi penurunan nilai kekuatan tarik menjadi 1397.9 N/mm 2 . Selanjutnya pada proses tempering 600 0 C nilai kekuatan tarik menjadi 1077.7 N/mm 2 , mendekati target kekuatan tarik yaitu 1020 N/mm 2 .

Shell mold is one form of sand mold with resin adhesive and thin contours following the pattern shape. The Department of Metal Casting Engineering, Politeknik Manufaktur Bandung, has been investigating this leather mold as one of the mold processes that is important to be developed. Nevertheless, the department currently has insufficient facilities to develop it. The main factor that inhibits the development of this mold process is the shortage of tools and the existing process. This study aimed to design and make a prototype machine shell molding at laboratory scale. The design of the machine was done in reference to Design Engineering, which generated design drawings with dimension of 1500 x 1000 x 500 mm.

Centrifugal casting is a metal casting process in which metal liquid is poured into a rotating mold at a specific temperature. Given round will generate a centrifugal force that will affect the outcome of the casting. Casting method is suitable in the manufacture of the casting cylinder to obtain better results. This research was performed to design a prototype machine by using the concept of centrifugal casting. The design method was a step-by-step systematic approach in the process of thinking to achieve the desired goal of realizing the idea and build bridges between idea and the product. Design process was commenced by the conceptual design phase and followed by the embodiment design stage and detailed design stage. With an engineering design process based on the method developed by G. E. Dieter, draft prototype of centrifugal casting machine with dimension of 550×450×400 mm, ¼ HP motor power, pulley and belt mechanism, diameter of 120-150mm, simultaneously with the characteristics of simple casting p...