How Are Enamel Pins Made? A Step-by-Step Factory Guide

The Complete Step-by-Step Manufacturing Process

Step 1: Design Fine-Tuning and Artwork Proofing

Every great pin begins with an accurate 2D vector file (usually in AI, EPS, or PDF format). Once you submit your artwork, our factory engineering team conducts a thorough pre-production technical review.

Because liquid enamel and physical metal have natural material limits, we inspect every detail for:

• Line Thickness: Metal dividing lines must be thick enough (typically at least 0.25mm) to hold enamel colors in place during baking.

• Color Cavity Size: Color-filled areas must be wide enough to accept enamel pigment without overflowing into adjacent sections.

If adjustments are necessary, our designers tweak the artwork while preserving your original aesthetic and send back a digital factory proof for your final approval.

Step 2: Precision CNC Mold Engraving

Once the design proof is approved, it is translated into a 3D digital model and loaded into a high-precision CNC engraving machine.

The machine carves your design onto a thick piece of high-strength steel to create a master mold (die). Every raised metal line, fine curve, and recessed color cavity is mirrored onto this steel die with millimeter-level accuracy. Once engraved, the mold undergoes heat treatment to harden the steel, ensuring it can withstand thousands of high-pressure strikes without losing detail.

Step 3: Metal Stamping and Die-Striking

With the master mold installed onto a heavy-duty hydraulic or mechanical stamping press, raw metal sheets—most commonly iron, brass, or zinc alloy—are fed into the machine.

Under immense pressure (often between 5 to 50 tons depending on the pin size and material), the steel mold strikes the raw metal sheet. This process instantly transfers the 3D raised and recessed artwork onto the metal surface, creating the base structure of your custom pin.

Step 4: Outline Cutting and Blanking

After stamping, the metal sheet holds a row of stamped pin designs surrounded by excess metal.

A custom steel cutting die—crafted precisely to match the exact outer perimeter of your design—is mounted onto a punch press. The machine punches along the outer edge, neatly separating each individual pin blank from the sheet metal. For complex outer shapes, zinc alloy die-casting is often used as an alternative to achieve clean, intricate cutouts.

Step 5: Back Attachment Welding

Before the pins are plated or colored, the functional attachments are securely fixed to the back.

Depending on your specifications, factory technicians use silver soldering or high-frequency spot welding to affix the back post (spur nail). This ensures the post will not bend, break, or detach during everyday wear. Common attachment options soldered at this stage include:

• Standard spur nails (for butterfly clutches, rubber clutches, or deluxe locking backs)

• Safety pins and brooch backings

• Screw posts or specialized dual-post layouts

Step 6: Surface Deburring and High-Speed Polishing

Stamping and cutting can leave micro-burrs, sharp edges, or surface minor oxidation on raw metal blanks.

To achieve a pristine, mirror-like finish, the raw pins undergo a two-step finishing process:

1. Vibratory Tumbling: Pins are tumbled in a liquid solution with ceramic media to smooth away sharp outer edges.

2. Manual Polishing: Skilled craftsmen press the front surface and edges of each pin against fast-spinning cotton polishing wheels. This removes microscopic imperfections and prepares the metal for plating.

Step 7: Multi-Layer Electroplating 

Electroplating gives the pin its distinct metallic color while protecting the base metal from tarnish and corrosion. The polished pins are racked onto wire frames and submerged into a series of chemical plating tanks.

Through an electrochemical reaction, a thin layer of real metal coats the surface. Popular plating options include:

• High-Gloss Finishes: Real Gold, Bright Nickel/Silver, Rose Gold, Chrome

• Dark & Matte Finishes: Black Nickel, Anodized Black, Matte Gold

• Antique Finishes: Antique Bronze, Antique Copper, Antique Silver

Step 8: Automatic Color Filling and Oven Curing

This is where your pin comes to life with vibrant colors. Using computer-controlled automated dispenser machines, liquid enamel pigments matched strictly to Pantone (PMS) color codes are injected into the recessed cavities of each pin.

• Soft Enamel Pins: Liquid enamel is dispensed into recessed areas. The pins are baked in industrial ovens at moderate temperatures. After baking, the enamel settles slightly lower than the raised metal edges, giving the pin its iconic textured surface.

• Hard Enamel Pins: Enamel pigments are filled above the metal rim, baked at higher temperatures, and then polished down completely flat, resulting in a smooth, jewelry-grade finish.

Step 9: 100% Quality Control, Custom Packaging, and Logistics 

Quality assurance is the final crucial gate before shipping. Our dedicated QC inspectors carefully examine every single pin under bright lighting to check for:

• Color accuracy and missing enamel fills

• Surface scratches, dust spots, or plating bubbles

• Firm attachment of back posts and clasps

Once passed, the pins are fitted with your chosen backings (such as black rubber clutches or gold butterfly clasps) and packed according to your order:

• Standard Packaging: Individual protective OPP polybags (ideal for bulk orders).

• Custom Packaging: Printed backing cards, velvet pouches, acrylic display boxes, or presentation gift boxes for retail-ready distribution.

Finally, the packed pins are securely boxed and dispatched via international express logistics (such as DHL, FedEx, or UPS) right to your doorstep.