JP-7857311-B2 - Molten metal filter

Inventors

• ヘンダーソン リチャード エス．
• ハルナン アンドリュー

Assignees

• パイロテック インコーポレイテッド

Dates

Publication Date

20260512

Application Date

20220317

Priority Date

20210318

Claims (4)

1. Two opposing plates, It includes a porous fire-resistant material and at least one hollow elongated member attached to a first end plate at a first end and to a second end plate at a second end, The first end plate has a passage that extends through the width of the first end plate and receives the first end of the elongated member, The second end plate has an opening that penetrates the second end plate in the width direction and receives the second end of the elongated member, and the second end plate includes an element configured to accommodate the thermal expansion of the elongated member. The element includes a tab positioned within the opening, The tab is formed to fill a ring-shaped recess that is continuously or discontinuously formed on the inner circumferential surface of the opening and to protrude inward from the inner circumferential surface. The tab is susceptible to damage due to thermal expansion of the elongated member. Molten metal filter.
2. Two opposing plates, It includes a porous fire-resistant material and at least one hollow elongated member attached to a first end plate at a first end and to a second end plate at a second end, The first end plate has a passage that extends through the width of the first end plate and receives the first end of the elongated member, The second end plate has an opening that penetrates the second end plate in the width direction and receives the second end of the elongated member, and the second end plate includes an element configured to accommodate the thermal expansion of the elongated member. The element includes a cement fillet positioned within or adjacent to the opening. Molten metal filter.
3. The second end of the long member is closed. The filter according to claim 1 or 2 .
4. The present invention provides a molten metal filter according to claim 1 or 2 , wherein the first end plate comprises a porous refractory material and is disposed within a filter box having an inlet side and an outlet side. The molten metal is introduced into the inlet side of the filter box so that it passes through the porous refractory material of the elongated member and a portion of the porous refractory material of the first end plate without cement coating, and reaches the outlet. A method for filtering molten metal.

Description

This application claims priority to U.S. Provisional Application No. 63/162,896, filed on 18 March 2021, the disclosure of which is incorporated herein by reference. This exemplary embodiment relates to a filter. It can be used in particular for applications as a cartridge filter used to remove solid inclusions from molten metal, and will be described with particular reference to this. However, it should be understood that this exemplary embodiment is also applicable to other similar applications. Molten aluminum generally contains solid inclusions that are detrimental to the final cast metal product. These solid inclusions typically originate from three sources: some are oxide particles drawn into the liquid flow from an oxide layer suspended on the surface; some are fragments of the furnace lining, transfer troughs, and other parts of the molten aluminum processing equipment, which are corroded and drawn into the flowing aluminum stream; and some are precipitates of insoluble impurities such as intermetallic compounds, borides, carbides, or other aluminum compounds like aluminum chloride. If inclusions appear in the final cast product after molten aluminum has solidified, such a product will have reduced ductility, reduced strength, or poor finish properties. Therefore, it is desirable to remove solid inclusions from the molten aluminum before casting it into a solid that may be used as is or subjected to further molding processes such as rolling, forging, or extrusion. The cartridge filtration process removes solid inclusions from a liquid by passing it through a porous, homogeneous filter medium on which a cake forms. Cake formation can be promoted by introducing cake-forming additives, such as excess titanium diboride, into the molten metal. Cake formation can be controlled to adjust the filtration process. Typically, the filtration process terminates when the cake is released. Generally, filtering molten metals, especially molten aluminum, presents a unique problem: the liquid is highly aggressive, making it difficult to find filter media that can withstand its aggressive chemical and thermal environment. In such systems, heat-resistant material filter media or filter elements are used. Preferred materials resist melting at high temperatures, chemical reactions with the metal, and degradation by erosion. The filter media must also maintain structural integrity at such high temperatures and, of course, capture or block the flow of solids and semi-liquids by preventing chemical reactions and/or mechanically preventing their flow through it. Various means for achieving filtration are known to those skilled in the art. Examples of these are found in U.S. Patents No. 4,964,993; No. 4,444,377; No. 4,426,287; No. 4,413,813; No. 4,384,888; No. 4,330,328; No. 4,330,327; No. 4,302,502; No. 4,298,187; No. 4,258,099; No. 4,179,102; No. 4,159,104; No. 4,081371; No. 4,032,124; No. 3,869,282; and No. 5,126,047, which are incorporated herein by reference. U.S. Patent No. 5,369,063, incorporated herein by reference, discloses a foam filter made of alumina that can be formed into a plate. Also in the art, cartridge filters comprising multiple rectangular end plates interconnected by filter tubes are used (see, for example, U.S. Patents No. 3,747,765 and 5,741,422, whose disclosures are incorporated herein by reference). U.S. Patent No. 4,964,993U.S. Patent No. 4,444,377U.S. Patent No. 4,426,287U.S. Patent No. 4,413,813U.S. Patent No. 4,384,888U.S. Patent No. 4,330,328U.S. Patent No. 4,330,327U.S. Patent No. 4,302,502U.S. Patent No. 4,298,187U.S. Patent No. 4,258,099U.S. Patent No. 4,179,102Strength Patent No. 4,159,104U.S. Patent No. 4,081,371U.S. Patent No. 4,032,124U.S. Patent No. 3,869,282U.S. Patent No. 5,126,047Strength Specification No. 5,369,063U.S. Patent No. 3,747,765U.S. Patent No. 5,741,422 A brief description of the drawings is provided below, but these are presented for illustrative purposes only and are not intended to limit the exemplary embodiments disclosed herein. The present invention comprises novel parts, configurations, arrangements, combinations, and improvements as shown and described. The accompanying drawings, incorporated into and constituting part of the specification, illustrate one embodiment of the present invention and, together with the specification, help to illustrate the principles of the present invention. This is a cross-sectional view of a conventional molten metal cartridge filter assembly. This is a perspective view of the end plate of the cartridge filter of this disclosure. This is a cross-sectional view of an individual tube as a component of a cartridge filter assembly configured in accordance with this disclosure. This is a cross-sectional view of a passage in the end plate of a molten metal cartridge filter configured according to another embodiment of the present disclosure. This is a cross-sectional view of a passage in the end plate of a molten metal cartridge filter co