Ceramic Metal Riser Tube Stalk

Abstract

The invention Ceramic Metal Riser Tube stalk is designed to countermeasure the problems caused by the use of conventional riser tubes. The subject matter uses metals and ceramics combination therefore achieving properties of both materials. The invention reduces safety risks of Riser tube replacement, down time, reduces losses caused by casting defects and it is economical to manufacture. Components of the subject matter can be reused for further economic benefits.

Claims

1. Ceramic Metal Riser Tube stalk works in combination with molten metals, its material, design and construction are to reduce chemical reactions between the invention and molten metals therefore giving it long operational life.

2. High strength materials used in the main body (4) give resistance to mechanical shock. It provides a strong base for Ceramic Metal riser Tube Stalk construction and supports ceramic or protection sleeves (5), (6) and thereof.

3. The invention remains airtight even after damage to its components ensuring Low Pressure Die Cast product quality is not compromised.

Description

DESCRIPTION OF DRAWINGS

[0010] FIG. 1 is an Isometric view of a Ceramic Metal Riser tube stalk showing embodiment of the subject matter;

[0011] FIG. 2 is a front view thereof;

[0012] FIG. 3 is a top view thereof;

[0013] FIG. 4 is a bottom view thereof;

[0014] FIG. 5 is a section view of FIG. 2 thereof;

[0015] FIG. 5A is a detailed section view of area A of FIG. 5 thereof;

[0016] FIG. 5B is a detailed section view of area B of FIG. 5.

[0017] FIG. 6 is an Isometric view of a Ceramic Metal Riser tube stalk showing a variation of flange configuration thereof;

[0018] FIG. 7 is a front view of Ceramic Metal Riser tube stalk with variation of flange configuration thereof;

[0019] FIG. 8 is a cross section view of FIG. 7 Ceramic Metal Riser tube stalk with variation of flange configuration.

DETAILED DESCRIPTION OF THE INVENTION

[0020] Design of Riser tube stalk consists of following components

[0021] (1) Neck; it is shapped to match various casting machine designs and is part of the main body of riser tube. Neck-less design is also adopted when interagted flange (3) is designed within the main body (4) of the Riser tube stalk.

[0022] (2) Sealing slots; Feature provided in the form of slots to hold sealing material between metallic and ceramic parts of the riser tube. Mechanical sealing is achieved by using very high temperature sealing compounds. The sealant has working temperatures of over 1200° C. and is shapped to the slot profile. Shape and quantity of slots vary according to level of sealing required. Some riser tubes may not require sealing slots where a different type of sealant can be applied in the form of expansion filler (10).

[0023] (3) Integrated flange; The flange is an integrated feature of this design. It can be of any dimension in shape, diameter and height. Since the flange is cast or machined with the main body (4) of riser tube stalk, it does not require any assembly, sealing or preparation therefore providing a gas tight operation and better quality of castings made on Low Pressure Die Casting machines. Integrated flange can bear high mechanical loads without damaging the tube.

[0024] (4) Main body; made from metal that is resistant to wear and chemical reaction from molten metal. It provides gas tight function for Low Pressure Die Casting process while molten metal is being transferred through the Ceramic steel riser tube stalk. The main body metallic design also provides mechanical strength and support to ceramic components of riser tube stalk. The main body is further treated to improve its strength and chemical properties. It can be made from various specifications of iron (Fe) alloys or other metals according to operational environment and cost constraints. It can be cast or machined in to the required shapes including tubular shapes to match various casting machine designs. The bottom end of main body is designed for securing parts to the main body. Threaded holes (8) are used for assembling retainer cap (7) to the main body (4).

[0025] (5) outer protection; Riser tube stalk operates in direct contact with molten metals at temperatures over 700° C. leading to wear caused by chemical reactions. A protection layer of barrier materials is applied in the form of a coating or sleeve. Barrier materials range from brush on coatings to advanced thermal or plasma sprayed metallic oxides and metallic ceramic sleeves, for example aluminium oxides, Zirconium, Tungsten, Molybdenum refractory materials or other compositions that are resistant to molten metals. Outer protection (5) when used as sleeve can be installed in single, double or multiple pieces. Outer protection is designed in a manner so it can be replaced.

[0026] (6) inner protection; Internal diameter or shape of main body (4) is protected from chemical and heat reaction of molten metals by using barrier materials. Barrier can be designed in any shape to match internal shape of the main body (4). Barrier materials range from brush on coatings to advanced thermal or plasma sprayed metallic oxides and metallic ceramic sleeves, for example aluminium oxides, Zirconium, Tungsten, refractory materials or any other compositions that are resistant to molten metals. Inner protection (6) when used as sleeve can be installed in single, double or multiple pieces. Inner protection is designed in a manner so it can be replaced.

[0027] (7) Retainer cap; Is a part of the Riser tube stalk to keep ceramic sleeves or tubes (5) and (6) in assembled position. Retainer cap also retains any bottom filter elements used in Low Pressure die casting process. Removeable or sacrificial retainer cap allows additional filter replacement. Retainer cap is made from metallic ceramics or metals with melting points above 1400° C. The main body of the Riser tube (4) can be designed in a manner that no retainer cap is neccesory or other retaining methods can be applied.

[0028] (8) Retainer cap fasteners; Retainer cap (7) is assembled to the main body (4) by using screw, bolts or pins made from metallic ceramics or metals with melting temperatures above 1500° C. Other cements, high temperature adhesives, ceramic fasteners and other securing methods are also used to fasten the retainer cap (8) to the main body (4).

[0029] (9) Lifting bolt holes; bolt holes are provided in the riser tube main body (4) flange area (3) for safe lifting. An eye bolt or other lifting accessory can be screwed in for lifting device coupling.

[0030] (10) Expansion filler;

[0031] The invention Ceramic Metal Riser Tube stalk uses material that are strong and resistant to molten metal and corrosion. Materials used in this invention may have different rates of thermal expansion, a layer of expansion absorbing material is used to compensate for the size changes without damaging the components in Ceramic Metal Riser tube stalk. Filler materials range from ceramic fibres, cements, clays and high temperature materials such as graphite and graphite impregnated ceramic fibres or combination. benefits.