Metal casting
First Claim
1. A filter unit for use in metal casting, the unit comprising:
- a filter adapter formed of refractory material and having a tapered outer surface;
said adapter having one or more locations which receive a filter, each location comprising an internal ledge, so that the size of the filter and adapter used may be selected to suit the metal pour weight and volume parameters of a metal casting to be produced;
a filter positioned at said location or one of said locations; and
a feeder sleeve which is mounted on the filter adapter or in which the filter adapter is mounted.
1 Assignment
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Accused Products
Abstract
A filter unit for use in metal casting including a filter adapter, a filter adapter per se, and a mold for use in metal casting utilizing the filter unit, as well as a method of producing a metal casting, facilitate or practice direct pouring in a manner which provides for greater flexibility, being applicable to a wider range of castings. The apparatus elements and method are particularly suitable for the manufacturing of castings of relatively high modulus and low pour weight, and for the manufacture of high volume castings of low modulus. The mold includes a mold cavity and a sprue, a filter unit located in the sprue, and the filter unit comprising an adapter of refractory material having one or more ledges o10 for mounting a filter, and a filter (e.g. ceramic foam filter) supported by one of the ledges. The size of the filter and adapter may be changed to suit the metal pour weight and volume parameters of the metal casting to be produced, and the method is practiced by direct pour of metal through the filter. A feeder sleeve may be located on the filter adapter, or the filter adapter may be mounted in the feeder sleeve.
23 Citations
23 Claims
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1. A filter unit for use in metal casting, the unit comprising:
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a filter adapter formed of refractory material and having a tapered outer surface;
said adapter having one or more locations which receive a filter, each location comprising an internal ledge, so that the size of the filter and adapter used may be selected to suit the metal pour weight and volume parameters of a metal casting to be produced;
a filter positioned at said location or one of said locations; and
a feeder sleeve which is mounted on the filter adapter or in which the filter adapter is mounted. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A filter adapter for use in metal casting, comprising:
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an adapter formed of refractory material, the adapter having a tapered outer surface and having two or more locations which receive a filter, each location comprising an internal ledge, so that the size of the filter used may be selected to suit the metal pour weight and volume parameters of the casting; and
whereineach of said locations is constructed to receive a filter of a size different from the other location or locations. - View Dependent Claims (8, 9, 10)
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11. A mold for use in metal casting, said mold comprising:
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a mold cavity and a sprue communicating directly or indirectly with said mold cavity; and
a filter unit located in said sprue, said filter unit comprising an adapter formed of refractory material and having a tapered outer surface, said adapter having two or more locations to receive a filter, each location comprising an internal ledge and constructed to receive a filter of a size different from the other location or locations, so that the size of filter and adapter used may be selected to suit the metal pour weight and volume parameters of a metal casting to be produced; and
a filter positioned at said location or one of said locations. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of producing a metal casting comprising the steps of:
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(a) providing a mold cavity having one or more sprues communicating with the mold cavity and providing substantially the sole entry of molten metal for forming a metal casting into the mold cavity;
(b) locating an adapter of refractory material, capable of mounting a filter, at one or more sprues;
(c) locating the adapter in a sleeve, or a sleeve on the adapter;
(d) disposing a filter in contact with and supported by the adapter so that the filter is spaced from the surface of a metal casting to be produced;
(e) practicing steps (b)-(d) to select a size of filter and adapter to suit the metal pour weight and volume parameters of a metal casting to be produced; and
(f) pouring molten metal through the filter into the mold cavity to provide a smooth, substantially non-turbulent, flow of molten metal through the filter into the cavity, to produce a metal casting. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification