Investment castings and lost foam castings

We are able to source low cost, high quality investment castings from a number of pre-approved ISO 9000 accredited factories in China. Our relationships with dozens of well regarded investment casting suppliers give us a depth of manufacturing capability to support your specific investment casting needs.

Investment casting process

The process of investment casting enables components to be produced accurately and repeatedly in a wide variety of high-performance alloys and other metals. It involves making a pattern using wax or a similar material that can be melted away in an oven, resulting in a mold that is then filled with molten metal.

Whilst primarily used for small castings, investment casting can produce aluminium castings of up to 30 kg and steel castings of up to 300 kg. The unit cost is generally higher than with die casting or sand casting but set-up costs are lower. Because the mold is formed around a one-piece pattern, investment casting can produce more complex shapes than would be possible with die or sand casting. In addition, minimal surface finishing is required.

Lost foam casting is a modern type of investment casting which bypasses certain steps in the process.

Sourcing investment castings from China

All our castings are quality assured and supplied from factories with appropriate measurement equipment, such as laboratory testing, spectrometer, hardness / tensile testing, X-ray and microstructure testing. The stringent metallurgical control systems in place ensure that chemical and mechanical properties meet customersí exact requirements.

As a sourcing agent we can supply most materials for investment castings which are equivalent to ISO Western grades, including all grades of: aluminium alloys, carbon & low alloy steels, cobalt base alloys, copper base alloys, ductile iron, magnesium alloys, nickel base alloys, precipitation hardening stainless steel, tool steels, 300 & 400 series stainless steel.

The major saving gained by sourcing offshore parts is the labour and therefore labour-intensive secondary operations. As well as casting capabilities, our suppliers also have CNC machining and finishing facilities. It is always more economical to add maximum value to the component by sourcing castings as close to the finished part as possible. This also eliminates any potential issues on delivery with porosity or inclusions.

Quality

Prior to production supply all investment castings are initially supplied as PPAP (Production Part Approval Process) samples along with necessary ISIR (Initial Sample Inspection Reports) material composition and mechanical testing results. Ongoing production will be controlled with appropriate process documentation, control plans, gauging instructions and regular quality sampling via the inspection laboratories. Where necessary, SPC control can be applied to critical features. For your added peace of mind, all deliveries can be supplied with relevant chemical composition reports.

Photo of wax patterns for investment casting
Photo of investment moulds production
Photo of finished investment casting