Two casting processes, two moulding methods and full machining — all in one workshop. Here is what each process does and when we choose it.
01 — Casting processes
Round, rotationally symmetric parts are cast centrifugally because it gives a denser structure. Everything else is sand cast, where the freedom of shape is far greater.
The mould is rammed from moulding sand around the pattern, poured once and then broken up. That puts no limit on the complexity of the shape, and cores create cavities and passages inside the casting.
Molten metal is poured into a spinning mould. Centrifugal force drives slag and gas towards the bore, where they are machined away — leaving the load-bearing section free of porosity.
02 — Machining
The workshop also takes on machining as a service — on parts you bring in, whether or not we cast them.
External and internal turning of round parts, threads, bearing seats.
Flat and profiled surfaces, slots, mating faces and flanges.
Holes, reaming and preparation for tapping on cast and rolled stock.
Fine finishing of fits and shafts where turning can't give the required surface.
Final finishing of cylinder and liner bores — to the specified roughness and bore geometry, which is what holds an engine's compression.
Machining of petrol and diesel engines — skimming heads and blocks, machining seats and bearing housings, preparing blocks for new liners.
03 — Materials
Alongside the EN designations we give the former JUS ones, since most of the drawings we receive still use them.
| Material | Former JUS designation | Process | Typical application |
|---|---|---|---|
| EN-GJL-200 | SL 20 | Sand | Housings, covers, brackets |
| EN-GJL-250 | SL 25 | Sand · Centrifugal | Cylinders, heads, flywheels |
| EN-GJL-300 | SL 30 | Centrifugal | Cylinder liners, rings |
| Al-Si alloys | AlSi | Sand · Permanent mould | Cylinder heads, covers, lighter castings |
| Tin bronze | CuSn | Centrifugal | Plain bushings, sleeves, bearings |
| Red bronze (gunmetal) | CuSnZnPb | Sand · Centrifugal | Marine valves and fittings, flanges |
04 — Quality control
Checks are made on the melt and on the finished part. Measurement data is supplied with the delivery when the customer asks for it.
The melt is analysed before pouring — so the alloy matches the specified designation.
Cross-section structure: graphite form, uniformity and any signs of poor cooling.
Hardness of the finished casting — an indicator of how it behaves in service and when machined.
Final dimensions and tolerances after machining, with an inspection report on request.
Next step
We choose the process — all you need to do is send the part, a drawing or a photo.