Casting process
Sand molding
Sand casting consists of creating an impression in sand from a pattern shaped like the part. Two perfectly aligned metal flasks are used to hold the sand used to take the impression of the pattern.
Sand casting is a foundry technique in which an impression is created in sand from a pattern, then molten metal is poured into it to produce a raw cast-iron part ready for machining.
Steps of the process
The moulder prepares the lower part of the mold, the half pattern is covered with sand.
For the upper part of the mold, the founder positions the second part of the pattern on the first. He adds the sprue pattern and then fills the flask with sand.
The caster then removes the half patterns, drills the vents, and touches up the impressions if necessary.
The core is placed on its prints, then the mold is closed.
The caster then proceeds to pour the molten alloy into the mold.
Once the casting has cooled, the sand mold is destroyed and the sand is processed. The part is separated by sawing from the gating system and risers. Grinding is then performed to remove any burrs. The raw casting is then ready for the machining of its functional surfaces.
Frequently asked questions
- What is sand casting?
- Sand casting is a foundry technique in which an impression is created in sand from a pattern, then molten metal is poured into it to produce a raw cast-iron part ready for machining.
- What are the steps in the casting process?
- The process consists of six steps: preparing the drag (lower mould), making the cope (upper mould), removing the patterns and drilling vents, placing the core, pouring the molten alloy, then shaking out, sawing and grinding the raw part.
- What types of cast iron do you work with?
- Loiselet mainly casts grey iron and ductile iron for industry, art, street furniture and road infrastructure, adapting the alloy to the mechanical and aesthetic requirements of each part.
- What is the minimum or maximum size of a part?
- We produce parts ranging from a few grams to several hundred kilograms. Contact us with your drawings for a feasibility study tailored to your project.