Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1998-06-02
2000-12-12
Batten, Jr., J. Reed
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164 41, 164 19, 164 45, 164 46, 264227, 264401, B22C 700, B22C 900, B29C 6700
Patent
active
061584975
DESCRIPTION:
BRIEF SUMMARY
INTRODUCTION
The present invention relates to a method of producing a model for use in the manufacture of a mould that consists of a multisection mould, said method comprising steps in which a first positive model of an item to be moulded in the moulding tool is formed by modelling the item and further by providing it with a flange, which is provided in a joint surface of the mould being formed with an outer circumference outside and along the outer periphery of the model, and that parts of the model are displaced after which a distance between the parts is formed by displacement of the parts.
The manufacture of moulds on the basis of a model of an item to be cast may be performed in different ways. One possible way suited for small items and for casting preliminary product series is the use of a stereo lithography model of the item. The stereo lithography model is produced in a plastic material by laser treatment. The stereo lithography model is then used as a basis for producing the mould.
It is known to use a stereo lithography model wherein a joint line to be established in the finished mould is established by providing the stereo lithography model, around an outer periphery of the model, with thin tape, which extends outwardly from the outer periphery and which will establish a joint surface in the silicone mould when casting a negative mould of silicone. The tape to be used has to be very thin and extends only in planes outside the item but is fastened to an area of the item along the outer periphery of the item.
This method may be used when the mould is manufactured from an elastic material such as rubber or silicone and when the mould has simple joint surface extensions. In cases when the mould has more difficult joint surface extensions in firm moulds, such as a mould manufactured from aluminium, this method is not applicable.
A different method of manufacturing moulds having difficult joint surface extensions consists of spreading on the basis of craftsmanship. This method also uses a model of the item to be cast and wherein a joint line to be established in the finished mould is established by providing the model, along a joint surface, with a plastic shaping mass such as putty, two-component filler or other material. The plastic shaping establishes a joint surface in the silicone mould when casting a negative mould of silicone.
U.S. Pat. No. 3,723,585 describes yet another method of manufacturing moulds on the basis of a model. The U.S. patent describes a mould with a parting frame at the location of the contemplated parting line of a two-part separable mould. The parting frame is constructed by first determining a parting line along the circumference of the mould and thereafter designating as the parting frame a rigid rectangular frame being a rectangular periphery about parallel faces of the parting frame. The parting frame furthermore has different thickness depending on the different parts of the parting frame serving different purposes, either as the actual periphery of the parting frame, or as the rigid rectangular frame between the two parts of the two part mould, or as protrusions for accurate location of various portions of the interior of the model in relation to the mould.
This method has the disadvantage that the dividing of the two part mould into two separable parts takes the basis in the mould and not in the item or the model itself. Thereby the mould may be made in such a way that the item can be moulded but perhaps not in the best manner depending on the item. This is especially disadvantageous if the item is very complicated with protrusions and indentations. However, as mentioned in the US patent, the method described is developed for and therefore primarily suitable for giant articles weighing more than two kilograms, such as a two passenger boat. The method is not suitable for small or tiny articles and especially not possible to use for complex articles. Furthermore, the method is for preparing a mould, not for preparing a model.
Thus, it is the object of the present inve
REFERENCES:
patent: 3190946 (1965-06-01), Keyes
patent: 4536364 (1985-08-01), Lindskog
patent: 4641270 (1987-02-01), Lalloz et al.
patent: 5439622 (1995-08-01), Pennisi et al.
Kristensen Ejvind Viggo
Lange J.o slashed.rn Anker
Batten, Jr. J. Reed
Formkon ApS
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