PENGECORAN LOGAM | Praktikum MK Teknologi Manufaktur

Summary

In this engaging lecture on manufacturing technology, the focus is on metal casting processes, specifically using the sand casting method. The presenter introduces the principles of metal casting, including the importance of using expendable and permanent molds. Students participate in a practical session where they melt tin and pour it into a sand mold shaped like a heart, demonstrating the casting process. The lecture emphasizes the significance of using suitable materials for melting containers and the importance of cooling techniques in metal casting, enriching students' understanding of this essential manufacturing discipline.

Takeaways

• 🎓 Introduction to manufacturing technology, focusing on metal casting.
• 🛠️ Metal casting involves pouring liquid metal into molds to shape it as it cools.
• 📦 Metal casting methods are categorized into expendable and permanent molds.
• 💡 Expendable molds are single-use, while permanent molds can be reused multiple times.
• 🔥 The practical session uses a simple sand casting method with bar tin as the liquid metal.
• 🌊 Special sand, similar to beach sand, is used for mold making due to its malleability.
• 🥣 Stainless steel is utilized for the melting pot due to its high melting point.
• ⚙️ Proper mold preparation is crucial; the mold must be larger than the pattern being cast.
• 💧 To speed up cooling, the cast metal can be submerged in water after solidifying.
• 🔍 The session concludes with a review of the casting process, emphasizing clarity and understanding.

Q & A

What is the focus of the course discussed in the transcript?

The course focuses on manufacturing technology, specifically exploring metal casting processes.

What is metal casting?

Metal casting is a process where liquid metal flows into a mold and solidifies into the shape of the mold.

What are the two main types of molds in metal casting?

The two main types of molds are expendable molds, which are used only once, and permanent molds, which can be reused multiple times.

What is the method of casting being demonstrated in the practical session?

The practical session demonstrates the sand casting method, which is a simple and common technique in metal casting.

What materials are used for the casting practice in this session?

The materials used include bar tin as the liquid metal and sand, specifically a type of sand that resembles beach sand for molding.

Why is it important to use a container with a higher melting point than the material being melted?

Using a container with a higher melting point ensures that it can withstand the heat without melting itself during the metal melting process.

What is the role of the sand in the mold preparation?

The sand is used to create the mold, allowing it to be shaped and compacted around the pattern before pouring the molten metal.

How is the tin prepared for pouring into the mold?

The tin is heated in a melting container until it liquefies, after which it is poured into the mold.

What method is suggested to speed up the cooling of the cast metal?

To accelerate cooling, the cast metal can be submerged in water once it has solidified.

What is the main takeaway from the practical session on metal casting?

The practical session aims to enhance understanding of metal casting processes and demonstrate how to effectively perform casting using simple materials.