Sandblasting

Le sandblastinga term that is often used in the foundry and more specifically in the manufacture of made-to-measure jewelleryis a surface treatment technique used to clean, polish or prepare a surface by projecting abrasive particles at high speed. This method is essential for obtaining precise, high-quality finishes that meet the requirements of the designs supplied by customers.

What is sandblasting?

Le sandblasting is a mechanical process in which abrasive particles, called abrasives or aggregatesare projected at high speed onto a surface using compressed air or water. This technique eliminates impuritiesthe oxidesthe paintingsand other contaminants. In the context of the jewellery foundrySandblasting is particularly used to create a smooth, uniform surface ready for further treatment or direct use as a finished product.

Types of sandblasting

There are several types of sandblasting adapted to different applications and materials. The main types are :

1. Dry sandblasting :

• Used mainly for metals.
• Abrasive project using compressed air.
• Ideal for removing rust, paint and mould residues.

1. Wet sandblasting (hydro-sandblasting) :

• Combine abrasive with water.
• Reduces dust and the risk of fire.
• Used for more fragile materials or in environments where dust must be kept to a minimum.

1. Micro-sandblasting :

• Used for precision work.
• Use very fine abrasives.
• Perfect for jewellery and small parts requiring a meticulous finish.

Abrasives used

The choice ofabrasive is crucial to achieving the desired result. Commonly used abrasives include :

• The sand Traditionally used, but less and less common because of the health risks involved.
• Steel shot Effective for stripping large metal surfaces.
• Corundum Hard and angular, ideal for precision sanding.
• Glass beads Gentle and non-aggressive, perfect for delicate finishes.

Sandblasting applications in the jewellery foundry

In the field of bespoke jewellery foundrySandblasting has many applications:

1. Surface preparation :

• Before applying gold or silver coats.
• To clean parts after moulding.

1. Texture creation :

• To give a matt or satin finish to the surface of jewellery.
• To create patterns and reliefs.

1. Eliminating defects :

• To remove burrs and other moulding imperfections.
• For smoothing surfaces before final finishing.

Advantages of sandblasting

Le sandblasting offers a number of advantages, including

• Efficiency Speed of cleaning and surface preparation.
• Versatility Adaptability to different materials and finishes.
• Precision : Ability to achieve high levels of detail, crucial for bespoke jewellery.
• Economy Reduction in labour costs and production times.

Disadvantages of sandblasting

Despite its many advantages, sandblasting also has a few drawbacks:

• Health and safety The dust generated can be harmful without adequate protection.
• Wear and tear on equipment Abrasion can damage blasting equipment over time.
• Consumption of materials Requires significant quantities of abrasives.

FAQ about sandblasting

1. What is sandblasting?
Sandblasting is a surface treatment technique that uses abrasive particles projected at high speed to clean, polish or prepare a surface.

2. What types of sandblasting are there?
The main types of sandblasting are dry sandblasting, wet sandblasting and micro-sandblasting.

3. What abrasives are used in sandblasting?
Commonly used abrasives include sand, steel shot, corundum and glass beads.

4. Why is sandblasting used in jewellery casting?
Sandblasting is used to prepare surfaces, create textures and remove defects from moulded parts.

5. What are the advantages of sandblasting?
Sandblasting is efficient, versatile, precise and economical.

6. What are the disadvantages of sandblasting?
The main disadvantages are health and safety risks, wear and tear on equipment and consumption of materials.

In conclusion, the sandblasting is an essential technique in the bespoke jewellery foundryThis allows us to achieve impeccable finishes and meet our customers' most demanding expectations in terms of design and quality.