Senior and Dickson Ltd
At Senior & Dickson our moulding shop contains 13 injection moulding machines with a range from 70 tonne to 320 tonne clamp force. These are supported by a number of 'pick and place' robots as well as raw material processing equipment (driers, mixers and re-grinding).
We have experience in processing the more common polymers - Polypropylene (PP) and Polyethylene (PE) as well as the specialised materials Polyvinylchloride (PVC), Polyetheretherketone (PEEK), Glass filled Nylon (GFPA) and Thermoplastic elastomers (TPE).
Post moulding processes include drilling, tapping and full product assembly.
We have been manufacturing plastic injection mould tools since 1981 and still build tools for our first customer. The tools are built to suit a number of factors, the material to be processed (Glass Filled Nylon, is a lot more aggressive than Polyethylene), the quantity of components required (some tools make 500 parts a year, others 500 parts an hour) the complexity of the component (some components require internal threads, ejection on the feed side, side actions, up and a way's) the list is endless, and of course the old favourite Price, these all need considering when the first brief or RFQ arrives on your desk.
We manufacture pressure die-casting tools; these are used primarily in foundries for the production of precision Aluminium castings in high volume, and can also be used for volume parts in Mazak.
The tools are usually built using tool steel for the bolsters and surrounding steel, with the main core and cavity and any part coming into contact with molten aluminium, in quality tool steel fully hardened and tempered.
The process of die casting is quite harsh on the tools with some foundries offering a reduced life span on the tooling before major repair work is required, Mazak a zinc based alloy which is much heavier than aluminium and is processed at much lower temperatures is favoured by a lot of companies the tooling is of similar construction, but the feed gates and sprue (area where the Mazak comes into the tool, and on to the component cavity) are of a different configuration.
Senior & Dickson manufacture and maintain a number of tools for both Aluminium and Mazak material for a number of foundries, the design process and tool complexity are very similar to the Plastics industry with a lot of the CAD requirements being the same, all the tools need a feed system, a cooling/heating system, and ejection to get the product out of the tool so the synergy is there from design to completed component.