Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1992-11-19
1995-01-03
Bradley, P. Austin
Metal founding
Process
Shaping liquid metal against a forming surface
1641544, 1641545, 164454, 164452, 164479, 164430, B22D 1106
Patent
active
053777441
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns the provision of apparatus for and a method of manufacturing extruded metallic products by casting and subsequently extruding a bar of metal alloy. The alloy will commonly be aluminium and for the present purposes the term alloy should be understood to include the pure metal as well as mixtures with other elements and compounds. It should be understood that alloys of other metals such as copper or magnesium may also be processed in accordance with the present invention.
It is frequently desirable to recycle scrap alloys. To achieve this it is commonly necessary to first cast the scrap into an elongate bar ready for subsequent processing. An articulated continuous casting machine suitable for this purpose is disclosed in GB-1305964. This continuous casting machine has two mould sub-assemblies each of which consists of a train of mould elements supported by an endless track and engaged with a drive means to be continuously displaced around the track. Each track has an elongate mould section co-extensive with and opposite the mould section of the other sub-assembly. As the mould elements are moved into this section, the mould element in front is engaged and a corresponding mould element of the other, overlying, subassembly is engaged. Thus, an elongate, closed mould is assembled and moves continuously from an upstream end of the mould section to the downstream end. At the downstream end each mould element separates from the following mould element and is returned to the upstream end. In use molten alloy is continuously injected into the upstream end of the mould, the speed of which is controlled to ensure the solidification of the alloy by the time it reaches the downstream end. Thus a bar of cast alloy can be continuously separated from the mould and either coiled or cut into lengths for subsequent storage and transport before further processing.
While it is sometimes desirable to coil and store the bar for later processing, it is also at times desirable to simultaneously cast and further process the bar by extrusion.
Continuous extrusion is commonly carried out in a continuous extrusion machine such as that disclosed in Lamitref's patent application GB-2095592. Such continuous extrusion machines have a wheel, rotatably mounted in a support structure. An endless groove is formed in the periphery of the wheel and an abutment, mounted adjacent an extrusion die intrudes into the groove. In use, alloy bar is entrained in the groove and drawn around until it engages the abutment. Subsequently friction heats the bar in the groove until the alloy is sufficiently malleable to extrude through the die. In Lamitref's patent application the bar is formed by casting in a wheel and belt caster and fed directly to the continuous extrusion machine.
The apparatus proposed by Lamitref is not useful when it is desired to produce bar stock for storage preparatory to subsequent extrusion processing and consequently lacks versatility. Conversely, it has proven difficult to feed continuously cast bar from the articulated type continuous casting machine to a continuous extrusion machine because of the problems encountered in coordinating the speeds of the casting machine and extrusion machine. This is a difficult problem because the cast bar formed in the casting machine tends to be cracked and susceptible to breakage when subject to stress. It would however by very desirable to enable direct continuous extrusion from bar cast continuously in an articulated casting machine to enhance plant versatility.
Accordingly the present invention seeks to provide apparatus for continuously casting and extruding alloy comprising a continuous casting machine having a mould movable along an endless path, and a continuous extrusion machine arranged downstream of the casting machine characterised in that the mould of the continuous casting machine is of articulated type and the mould is driven by means including a slipping clutch whereby a compressive axial force can be applied to a cast bar fed directly from the cas
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Bradley P. Austin
Holton Machinery Limited
Puknys Erik R.
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