How To Do Jewelry Investment Casting_.pptx

Dive into the world of jewelry investment casting, the go-to method for crafting high-quality bling! It's all about precision and a dash of creativity. Start by pressing rubber molds – think of it as giving shape to your jewelry dreams. But watch out for sticky, soft molds; they're like undercooked cookies.

Next, it's wax time! Molding wax into rubber molds is an art. Temperature and pressure are your new BFFs here. But if your wax pieces are looking a bit rough or have bubbles, it's like dealing with a bad hair day – fixable with the right products and techniques.

Casting investment is where you mix your magic plaster and create a mold strong enough to hold your precious metal. It's like building a fortress for your jewelry's first home.

Melting and pouring are the fireworks of the process. Whether you're spinning, vacuuming, or induction melting, it's all about getting that metal to flow like liquid gold.

Finally, cleaning up your cast jewelry is like giving it a spa day. Remove the plaster, spray it down, and cut it free – your jewelry will come out shining and ready to wow your customers.

So, whether you're a jewelry store, studio, brand, or designer, this guide is your ticket to mastering the ancient art of investment casting. Get ready to level up your jewelry game and create pieces that sparkle and sell. Happy casting!

1. How To Do Jewelry Investment Casting? Get entire article, please visit: https://sobling.jewelry/investment-casting-process/

2. CONTENTS Pressing the Rubber Mold Wax Mold Making Casting Investment Melting and Pouring Casting Cleaning 01 03 05 02 04

3. Jewelry Investment Casting The lost wax casting process, now known as Investment Casting, has become the primary method for producing high-quality jewelry, accounting for over 60% of gold, silver, and copper pieces, with a complex flow requiring strict control of parameters to minimize defects.

4. 01 Pressing the Rubber Mold

5. Pressing the Rubber Mold

6. Pressing the Rubber Mold Analysis of Common Problems and Countermeasures for Compression Molds Problems Causes Countermeasure The finished rubber mold is sticky and soft Short vulcanization time or too low temperature Check the molding machine, adjust working temperature and time The rubber mold is too hard, has high elasticity, and cannot be flattened Excessive pressure, long duration, high temperature Reduce pressure, adjust working temperature and time Partial rubber mold layer has come off Contaminated the rubber due to grease on hands, etc. Remove dirt and keep the rubber mold clean The rubber mold is filled with bubbles, and the surface is sunken. The rubber mold and the pressing frame are not filled tightly. Fill the pressing frame tightly. The rubber shrinks excessively. The temperature is too high during vulcanization Use standard temperature and time

7. 02 Wax Mold Making

8. Wax Mold Making Wax injection molds are created by pressing wax into a rubber mold, with attention to wax temperature and pressure.

9. Wax Mold Making  Adjusting Air Pressure Wax Injection Wax Model Repair Welded Wax Model

10. Wax Mold Making Causes and Solutions of Common Wax Mold Defects Question Image Possible reasons Solutions The wax piece has burrs. 　 (1) The air pressure of the wax injection machine is too high, or the wax temperature is too high; (2) The clamping force on both sides of the mold is too small; (3) The mold stays at the wax nozzle for too long. (1) Lower the air pressure or wax temperature of the wax injection machine; (2) Increase the clamping force on both sides of the mold; (3) Shorten the injection time. The wax piece is incomplete. 　 (1) The wax injection machine's air pressure is too low or the wax temperature is too low; (2) The mold is clamped too tightly; (3) The wax outlet of the injection machine is blocked; (4) There is a problem with the mold, and internal gas cannot escape; (5) The mold temperature is too low, causing the incoming wax to solidify quickly. (1) Increase the air pressure or wax temperature of the injection machine; (2) Reduce the pressure on both sides of the mold; (3) Clean and unblock the wax outlet of the injection machine; (4) Open "venting lines" in the dead corners inside the mold; (5) Place the mold in 20-22℃ room temperature 1-2 hours before starting the wax injection. There are bubble s inside the wax piece 　 (1) The air pressure of the wax injection machine is too high; (2) The amount of wax in the injection machine is too low; (3) The wax temperature is too high or too low; (4) The wax inlet of the mold is not aligned with the wax outlet of the machine, causing air to enter with the wax. (1) Adjust the air pressure of the wax injection machine accurately; (2) Increase the amount of wax in the injection machine (no less than half of the wax machine capacity; (3) Adjust the wax temperature to the correct range (65-75℃) ; (4) Align the wax inlet of the mold tightly with the wax outlet of the machine, leaving no gaps Wax pieces are prone to breakage. 　 (1) Wax temperature is too high; (2) Too much "old wax" is reused; (3) Wax pieces are left in the mold for too long; (4) Using poor quality wax or wax that is too hard. (1) Lower the wax temperature; (2) Add new wax to the injection machine (new wax accounts for the total wax amount in the machine over 60%); (3) When injecting wax in large batches, inject fewer molds at a time; (4) Switch to high-quality wax or softer wax Wax pieces are easily bent and deformed. 　 (1) Wax temperature is too high; (2) Wax pieces are taken out of the mold too early before cooling; (3) Using overly soft wax in summer. (1) Lower the wax temperature; (2) Wait until the wax pieces cool in the mold before taking them out (more than 1 min); (3) In summer, choose harder wax.

11. 03 Casting Investment

12. Casting Investment

13. Casting Investment  Plaster casting flask Weighing cast powder Hand mixing of casting powder liquid plaster Grouting Vacuuming Mold Keep still

14. Casting Investment R&R Gypsum Cast Roasting Regime R&R platinum mold burnout system

15. 04 Melting and Pouring

16. Melting and Pouring

17. Melting and Pouring Gun Melting High-Frequency Induction Melting Manual centrifugal casting Manual vacuum casting Induction melting centrifugal pouring Induction melting vacuum pressure pouring

18. Melting and Pouring Analysis table of common problems and countermeasures in jewelry casting Common Casting Defects Defect Illustrations Possible Causes Flash and Burrs 　 ①Incorrect ratio of casting powder to water, too much water used; ②Mold moved after investment during the resting period; ③Rapid temperature increase during the burnout process; ④Mold left out for too long before being placed in the furnace, causing internal cracks in the mold cavity Raised Gold Beads on Surface 　 ①Incorrect ratio of water to powder, too little water used; ②Excessive working time during the investment operation; ③ Abnormal operation of the vacuum machine Rough Surface of Casting 　 ①Rough surface of the wax model; ②Poor quality or expired casting powder; ③Rapid temperature increase during the burnout process Incomplete Casting 　 ①Incorrect wax tree planting; ②Suboptimal metal casting temperature; ③Low mold temperature during pouring; ④Insufficient amount of metal used for casting Porosity in Castings 　 ①Metal casting temperature is too high; ②Mold not fully burned through; ③Excessive recycled material used in casting; ④Severe air intake during the melting process Shrinkage Porosity in Castings 　 ①Metal liquid pouring temperature is too high; ②Mold temperature is too high; ③Improper positioning or size of the water line; ④Insufficient pouring pressure

19. 05 Casting Cleaning

20. Casting Cleaning

21. Casting Cleaning Exploding Plaster Water Spraying Acid Immersion Casting sprue Cutting 

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