The process for custom enamel pins generally includes the following steps, which ensure quality control from design to finished product:

1. ** Design Confirmation ** :
- According to the design drawing or concept provided by the customer, the designer will produce detailed drawings.
- Customer confirms the final design, including shape, size, color and other special requirements.

2. ** Mold making ** :
- Use computer aided design (CAD) software to generate accurate mold files.
- Molds for pressing metal sheets are carved by numerical control machine (CNC) or other precision equipment.

3. ** Embryo preparation ** :
- Select appropriate metal materials (such as copper, iron, zinc alloy, etc.), and use molds to press and form.
- For pins that require additional parts, such as safety pins or horse pins, solder them on at this stage.
- Pressed embryos usually need to be pickled to remove surface impurities and oxide layers.

4. ** Paint (enamel filling) ** :
- Adjust the color of enamel glaze according to the design requirements.
- Fill the tuned enamel glaze into the grooves between the metal lines so that the glaze is slightly higher than the metal wire frame.
- The filled embryo is baked in a high temperature oven to solidify the enamel and reach a certain hardness.

5. ** Smooth ** :
- Grind the surface of the baked product with a metallographic wheel until all wire frames are exposed and the surface is flat.
- If any unevenness is found, the painting, baking and grinding process should be repeated.

6. ** Polishing ** :
- Rough and smooth polishing, adding lubricating substances such as paraffin to make the surface smooth and delicate.
- The polished pin product should have a mirror-like luster to increase aesthetics.

7. ** Electroplating ** :
- After finishing the polishing, the pin is pickled again, ready for plating.
- Gold plating, silver plating, bronzing and other plating effects can be selected to give the pin different appearance characteristics.

8. ** Cleaning and drying ** :
- Dry the finished product after thorough cleaning with water.

9. ** Quality inspection ** :
- The final step is to carry out a comprehensive quality test on each enamel pin to ensure that there are no defects and that it meets the customer's expected standards.

10. ** Packing and delivery ** :
- According to the order quantity and customer needs, choose the appropriate packaging method.
- Prepare the logistics and send the custom enamel pins to the customer.

The above is a typical production process for custom enamel pins. In practice, the specific process may vary depending on the manufacturer, but generally similar steps are followed to ensure product quality. If you are considering custom enamel pins, it is recommended to contact a professional supplier for more detailed information and support.