A Comprehensive Guide To Mechanical Processing Technology Of Jewelry Making.pptx

Hey jewelry peeps! Ever wondered how your favorite gold rings, bracelets, and earrings are made? Let's dive into the cool world of mechanical processing in jewelry making. Think of it as turning raw metal into shiny treasures!
First up is continuous casting. Imagine pouring hot, gooey metal into a special mold and pulling out a perfectly shaped rod. It’s like making long, shiny noodles! This method is super cool because it makes the metal stronger and can create all sorts of shapes—square, round, or even wacky ones. Plus, it’s super efficient for making lots of jewelry at once.
Next, we’ve got sheet and wire processing. Sheets are rolled thin and cut into shapes, while wires are pulled through tiny holes to get super thin and bendy. It’s like playing with playdough, but with metal! These processes are perfect for making rings, chains, and other cool jewelry pieces.
Then there’s stamping. This is where you use big machines to press metal into shapes. Imagine squishing a piece of metal into a ring or a pendant with just one press! It’s like magic, but with science. Stamping can cut, bend, or shape metal into anything you want.
But wait, there’s more! Sometimes things go wrong—like cracks, uneven surfaces, or even broken wires. But don’t worry! With the right techniques and a bit of TLC, these issues can be fixed. And in the end, you get a shiny, perfect piece of jewelry that’s ready to wear!
Whether you’re a jewelry store owner, a designer, or someone looking to sell custom pieces, mechanical processing is your secret weapon for turning raw metal into wearable art. Ready to turn your jewelry dreams into reality? Let’s get crafting!

1. A Comprehensive Guide To Mechanical Processing Technology Of Jewelry Making Get entire article, please visit: https://sobling.jewelry/how-jewelry-magic-happens-crafting-from-metal-to-bling/

2. CONTENTS Machining of Sheets, Pipes, and Wires Materials 02 Continuous Casting Profiles 01 Stamping Process 03

3. 01 Continuous Casting Profiles

4. Continuous casting means continuously pouring molten metal into a special metal mold (crucible), and the cast profile solidifies (forms a shell). It is continuously pulled out from the other end of the crucible. It can obtain cast profiles of any length or a specific length. Vertical Continuous Casting: The earliest continuous casting method for jewelry alloys, still widely used for larger cross-sections, with two types: downward and upward pulling. Horizontal Continuous Casting: Offers simpler equipment, higher speed, and easier automation but is limited to smaller profiles and struggles with larger diameters. Continuous Casting Profiles Introduction to Continuous Casting Technology Continuous casting offers superior mechanical properties due to rapid cooling, eliminates the need for pouring system risers, simplifies the production process, is highly mechanizable and automatable, allows for large-scale production without length limitations, and can produce complex cross-sectional profiles. Advantages of Continuous Casting Continuous casting profiles are categorized by mold shape and material, with graphite molds being popular for their thermal conductivity and durability, and the profiles can have various cross-sectional shapes including square, rectangular, circular, flat, tubular, or irregular. Categories of Continuous Casting Profiles

5. Continuous Casting Profiles The principle of down-drawing continuous casting The principle of up-drawing continuous casting

6. Continuous Casting Profiles Principle Diagram of Horizontal Continuous Casting Porous Graphite Molds Typical Continuous Casting Copper Profiles

7. 02 Machining of Sheets, Pipes, and Wires Materials

8. Processing Sheets Materials Press (Roll) machine, scribing pen, iron cutters, and iron pliers. 01 Main Equipment and Tools Before pressing gold bars, clean the machine and bars, adjust roller distance, and determine pressing counts based on gold quality, followed by annealing and controlling sheet curvature. For jewelry making, draw and cut gold sheets into required shapes, and remove burrs, using mechanical punching for mass production. Key Points of the Operating Process 02 Processing of gold sheet

9. Processing Pipe Materials  Rolling pipe blank Trimming the end of the pipe blank Pulling the pipe  Welding the pipe Pipes are made from sheets by rolling and drawing them through wire drawing plates, with manual shaping and trimming followed by pulling to achieve the desired size, and welding to form a sealed pipe; for gold or silver pipes, an aluminum or copper wire core may be used during drawing and later removed by acid immersion.

10. Processing Gold Wire Drawing wire Gold bars are rolled into wires using a wire drawing machine and plate, with intermediate annealing steps required for quality; these wires are then shaped into various semi-finished products like rings for jewelry.

11. 03 Stamping Process

12. Stamping Process Stamping is a metal forming process using presses and dies to create precise, smooth, and dimensionally accurate parts through plastic deformation or separation. Stamped jewelry parts are thin, lightweight, strong, and uniform, with high surface quality, production efficiency, and potential for automation. Characteristics of Stamped Jewelry Stamping is suitable for large batches, requires stable jewelry structures, appropriate metal thickness, and alloys with good cold-working properties. Conditions for Adopting Stamping Stamping materials must have uniform strength, good plasticity, smooth surfaces, and precise thickness to ensure high-quality stamped parts. Material Requirements for Stamping

13. Tools and Equipment Required for Stamping Stamping Machinery Hydraulic press Punching power press Manual press machine Stamping machinery is categorized into pneumatic, hydraulic, and manual presses based on force generation methods, each producing distinct effects on finished products.

14. Tools and Equipment Required for Stamping Stamping Molds

15. Tools and Equipment Required for Stamping Stamping Molds - Typical Jewelry Mold Manufacturing Process Material Cutting Surface Grinding Engraving and milling processing Copper electrode  Grinding the die shanks Mold Production Plan : Determine mold type and structure based on product dimensions and manufacturing processes. Material Preparation : Cut purple copper and mold steel materials as required. 3.Surface Processing : Use an iron bed and grinding machine to process and smooth material surfaces. 4.Copper Electrode Creation : Mill purple copper using a precision engraving machine to create copper electrodes. 5.Component Processing : Manufacture mold components like die shanks and punch pins.

16. Tools and Equipment Required for Stamping Stamping Molds - Typical Jewelry Mold Manufacturing Process Line Positioning  Steel Material Heat Treatment  Electrical Discharge Machining of Molds Stamping Mold Oil-Pressure Mold 6.Marking and Drilling : Mark and position materials according to drawings, then drill holes. 7.Heat Treatment : Perform heat treatment on mold steel blocks. 9.Mold Assembly : Assemble mold blocks, die shanks, punch pins, and inserts as per the design plan. 10.Testing and Modification : Test molds using punch or hydraulic presses, and modify based on results. 8.Mold Machining : Use computer programming, wire cutting, or electrical discharge machining for mold blocks, punches, and inserts.

17. Classification of Stamping Processes and Their Characteristics Nature of work Job title Work Process Flow Chart Characteristics and application scope Separation process Cutting   Cutting off of plates with shears or punching dies, without closing of the cut-off line Blanking Blanking and punching   Punching and cutting the sheet along the closed line with a punching die, and the punched part is waste material Notching   Punching of a notch in the blank along an unenclosed line, with bending of the cut part, e.g., ventilation panels. Edge cutting   Cutting off the edge of a workpiece Forming process Bending   Bending a sheet into a certain shape Drawing deep   Making a workpiece from a flat blank Forming Undulating   Partial stamping of plates into raised and concave shapes

18. Three Stages and Characteristics of the Blanking Process Phase Characteristics Section Characteristics Phase 1 Sheet in the convex mold pressure, the first elastic compression and stretching deformation; at this time, the convex mold is a slightly crowded sheet, the other side of the sheet is also slightly crowded concave mold edge, convex mold end of the material below a slight bend, concave mold edge above the material began to buckling gap is more prominent, bending and buckling the more serious, the sheet in the convex, concave mold edge at the formation of the initial burr roll of the angle, the material at this time, the internal stress has not exceeded the elastic limit, when the removal of external forces, the material can be restored to its original state. The material can be restored to its original state when the external force is removed. This stage is called the elastic deformation stage. Initial burr roll, permanent burr roll Phase 2 Plastic deformation, external force beyond the material's strength limit, resulting in fracture lines, when the convex mold continues to press people, the pressure increases, the stress inside the material is also increased, the stress in the material reaches the yield limit will begin to enter the plastic deformation stage. In this stage, as the depth of the convex mold extrusion into the material gradually increases, the material program's plastic deformation also gradually increases. Due to the existence of the gap at the edge, the internal tensile stress and bending moment of the material also increase, so that the hardening of the material in the deformation zone increases until the material near the edge, due to the tensile stress and stress concentration of the role of the beginning of micro-cracks, at this time, the blanking deformation force also reaches the maximum value. The appearance of micro-cracks indicates that the material begins to damage, and the plastic deformation stage ends.   Generation of bright bands perpendicular to the sheet and initial burr Phase 3 Fracture separation stage microcracks continue to extend to the material within the overlap extension, the material fracture separation. The Convex continued to fall, producing the upper and lower micro-cracks that continued to expand and extend to the inside of the material; when the upper and lower cracks met and overlap, they began to separate the rough fracture zone, when the convex die down again, will be punched out of the part of the die holes to this point, the convex die back up to complete the entire blanking process.   Produces rough and tapered fracture zone burr initial elongation

19. The Stamping Process of Typical Jewelry Pieces The stamping process for a typical ring shank involves creating a punching die, adjusting pressure and material amounts, trimming burrs, shaping the ends for bezel settings, rounding the shank with bending steps, and finalizing the piece through welding, stone setting, and polishing. Mold for Square Gold Bar Used in Ring Shank (According to Klotz F, 2003) Mold Assembly (According to Klotz F, 2003) For a four-prongs setting, the end of the ring shank is cut to an angle of 90° (According to Klotz F, 2003) For a six-prong setting, the end of the ring shank is cut to an angle of 60° (According to Klotz F, 2003) Bending the end of the ring shank (according to Klotz F, 2003) Rounding the ring shank (according to Klotz F, 2003) The ring shank after full round polishing (According to Klotz F, 2003) The assembled ring (According to Klotz F, 2003)

20. Common Quality Issues in Stamped Jewelry Parts Central shrinkage, blistering, inclusions, contamination, and poor surface quality can cause cracks, brittleness, and uneven surfaces, requiring careful control of casting and annealing conditions. Poor roll quality, unstraightened rolls, bent rolls, edge cracks, and thickness variations lead to surface scratches, jagged edges, uneven thickness, and increased scrap rates. Fins and stacking occur due to excessive reduction, creating weak points prone to cracking during twisting or bending. Casting Ingot Defects Rolling Plate/Strip Defects Bar Rolling Defects 01 02 03 Breakage or necking results from excessive drawing, inclusions, improper reduction rates, or lubrication interruptions. Over-annealing causes excessively large grains, leading to an orange peel surface that is difficult to polish. Wire Drawing Defects Annealing Defects 04 05

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