What You Need To Know About Metal Pre-Melting In Jewelry Casting Process.pptx

Hey there, jewelry lovers! Ever wondered how your favorite gold or platinum jewelry is made? Let's dive into the world of metal pre-melting in jewelry casting. It's like cooking, but with metals! 🥩
First up, we need the right ingredients. Different countries have their own favorite gold grades. For example, China loves 24K gold, while the US prefers 14K and 18K. We also use silver, platinum, and even stainless steel for different styles. Tools like bolt cutters and X-ray machines help us get everything just right.
Next, it's time to mix and melt. With torch melting, we use a super-hot flame to turn metals into liquid gold. We pour it into molds, cool it down, and voilà! We also use induction melting, which is like a high-tech microwave for metals. It’s super precise and makes perfect beads.
Finally, we test everything to make sure it’s top-notch quality. X-ray machines check the purity, and we calculate the loss rate to keep things efficient.
Whether you’re a jewelry store, designer, or even a celebrity looking for custom pieces, this process ensures every piece is perfect. Ready to shine? Let's create some jewelry magic together!

1. What You Need To Know About Metal Pre-Melting In Jewelry Casting Process? Get entire article, please visit: https://sobling.jewelry/what-you-need-to-know-about-metal-pre-melting/

2. CONTENTS CONTENTS ” 01 Material Preparation 03 Induction Melting 02 Torch Melting

3. 01 Material Preparation

4. Background Knowledge

5. Background Knowledge Common Gold Grades for Jewelry in Different Countries and Regions Country or Region Common Gold Grade Corresponding minimum gold content China 24K gold, 18K 24K gold：99.9%；18K：75.0% India 22K 91.6% Arab countries 21K 87.5% United Kingdom Mainly 9K, with a small amount of 22K and 18K 9K：37.5%；22K：91.6%；18K：75.0% Germany 8K,14K 8K：33.3%;14K：58.5% United States 14K,18K 14K：58.5%；18K：75.0% Italy, France 18K 75.0% Russia 9K〜18K 37.5%〜75.0% United States 10K〜18K 41.6%〜75.0%

6. Background Knowledge Appearance of several typical gold materials for jewelry Silver and silver alloys for jewelry Platinum and Platinum Alloys for Jewelry

7. Background Knowledge  Common copper and copper alloys used in jewelry  316L stainless steel ring Pure titanium for jewelry

8. Background Knowledge Common electronic scale used for jewelry materials X-ray fluorescence spectrometer Bolt cutters Power press machine

9. Task Implementation - U se pure gold ingots and 18K rose gold for patching Cutting material with large bolt cutters  Cutting material with a rolling press 18K rose gold formulation 1. Preparation of Raw Materials: Pure gold ingots are broken down into smaller pieces using large bolt cutters or a rolling mill for accurate weighing and melting. 2. Mixing Materials: For 18K rose gold, companies mix pure gold at 75.2%–76.0% content to ensure quality consistency, with the remainder as filler material. 3. End of Work : After mixing, submit the precious metal materials, turn off the balance, and clean the workplace

10. 02 Torch Melting

11. Background Knowledge

12. Background Knowledge Torches for melting Types and Composition of Flames From left to right: Oxygen Cylinder, Acetylene Cylinder, Liquefied Petroleum Gas Cylinder

13. Background Knowledge Quartz Crucible for Torch Melting Quartz glass rods for stirring and skimming slag Crucible tongs for torch melting Oil Tank for Pouring Ingots

14. Preparation of the oil tank Stirring molten metal during torch melting Pouring the ingot Task Implementation - U se a torch, liquefied petroleum gas, and oxygen to smelt 18K platinum Preparation Work: Clean and preheat the oil tank, apply vegetable oil to reduce oxidation, prepare crucibles by checking for defects and forming a glaze with borax, and place pure gold into the crucible. Adjusting the Flame: Connect the torch, expel impurities from the gas line, and adjust the gas and oxygen flow to achieve a structured flame with noticeable airflow. Melting Pure Gold: Heat the pure gold with the outer flame and add borax powder to assist melting until fully molten. 4.Melting the Filler Material: Add filler material to the molten gold, use a yellow neutral flame, sprinkle borax, stir with a glass rod, and ensure uniform melting and composition. 5.Pouring the Ingot: Observe the molten metal's condition, swirl and pour it into the oil trough, heat the ingot surface for smoothness, and recover any residual metal. 6.Disassemble the Ingot: Allow the ingot to cool, remove and quench it, clean the surface, and cut it into smaller pieces for further processing. 7.Calculate the Loss Rate: Weigh the ingots and melting tailings, and calculate the melting loss rate based on the initial batch mass. 8.Testing the Fineness: Use X-ray fluorescence spectrometry to test the gold content of a sample ingot to ensure quality and uniformity. 9.End of Work: Submit materials, close gas cylinders, store equipment, turn off power sources, and clean the workplace.

15. 03 Induction Melting

16. Background Knowledge

17. Background Knowledge Schematic diagram of the principle of induction melting Typical induction melting furnace for jewelry production Induction Melting Granulator Quartz crucible and quartz outer shell Quartz crucible for casting jewelry

18. Metal liquid flowing into water for granulation Task Implementation - An induction melting granulator was used to produce 18 KY gold beads Place the graphite crucible into the quartz outer shell Install the graphite plug rod Installing the Granulation Bucket Control panel of the induction melting granulator Taking out the beads Preparation Work : Insulate and secure the graphite crucible, set up the thermocouple, and prepare the granulation bucket and cooling system. 2.Melting Pure Gold : Heat pure gold to 1150°C in the crucible using controlled current adjustments. 3.Melting the Filler Material : Add filler material to the molten gold, maintain at 1050°C, and stir thoroughly. 4.Pouring and Granulation : Release molten metal into the granulation bucket to form granules through rapid cooling. 5.Drying Beads : Extract and dry the formed beads in a drying oven. 6.Calculating Loss Rate : Weigh beads and residual metal to determine material loss. 7.Testing the Purity : Use X-ray fluorescence spectrometry to check bead purity. 8.End of Work : Cool equipment, shut down systems, and clean the workspace.

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