GB2257383A - Duct for conveying molten metal - Google Patents
Duct for conveying molten metal Download PDFInfo
- Publication number
- GB2257383A GB2257383A GB9113762A GB9113762A GB2257383A GB 2257383 A GB2257383 A GB 2257383A GB 9113762 A GB9113762 A GB 9113762A GB 9113762 A GB9113762 A GB 9113762A GB 2257383 A GB2257383 A GB 2257383A
- Authority
- GB
- United Kingdom
- Prior art keywords
- joint
- sections
- launder
- duct
- molten metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
A section of a molten-metal-conveying duct such as a launder comprises a dovetailed end 9 for engagement with a complementary dovetailed end 10 on another section of a molten-metal-conveying duct. <IMAGE>
Description
DUCT FOR CONVEYING MOLTEN METAL
This invention relates to ducts for conveying molten metal and is particularly, though not exclusively, to launders.
Launders are used in foundries for conveying metal from a crucible to a mould. They comprise a generally U-section channel, a lid optionally covering the mouth of the U in use.
As launders are long (e.g. 3 metres) they are usually made in sections which are lap-jointed together (i.e. an end of one section lying within an end of the neighbouring section). The sections themselves lie within a channel and are supported within the channel by refractory material. At one or both ends of the channel ceramic fibre wadding is used to accommodate movement due to thermal expansion and contraction in use.
To prevent metal solidifying in the launder and to ensure full drying-out of the launder, launders are usually preheated. Pre-heating naturally results in thermal expansion of the launder sections and lap-jointing allows relative movement of the sections and the use of refractory fibre at the ends of the sections accommodate movement so preventing the launder sections arching out of the surrounding channel when preheated.
When, however, the launder is removed from its preheating furnace and positioned ready for use naturally there will be some cooling and this results in thermal contraction.
As lap-joints allow some degree of relative movement between the sections paths for escape of metal may result at the joints.
It has been proposed to overcome this problem by providing a joint as shown in Figure 1 in which a protrusion in one member of the lap-joint engages a groove in the other member of a lap-joint. This construction has several disadvantages a major one being manufacture to the tolerances required. The effect of this joint is to lock the two joined sections into engagement and it is found that when using this construction it is necessary to use more sections for a given length of launder than when using a simple lap-joint. The present Applicants have concluded that to obtain a joint for molten-metal conveying ducts such as launders it is advantageous to provide the joint in the form of a dovetailed joint.
The invention is illustrated by way of example in the drawings in which:
Figure 1 is a part section of a prior art launder joint; and
Figure 2 is a perspective view of a joint in accordance with the invention.
Discussing first the prior art design of Figure 1, this comprises a pair of launder sections 1, 2 the launder sections having reduced cross-section portions 3 and 4 respectively forming a lap-joint as is widely used. In this prior art construction a bead 5 on portion 3 engages with a complementary groove 6 on the part 4.
In the joint of the present invention launder sections 7 and 8 have respectively male 9 and female 10 dovetailed ends which inter-engage. This construction is easier to make than the prior art construction of Figure 1 and overcomes the disadvantages of the widely used lap-joints.
Claims (1)
1. A section of a molten-metal-conveying duct such as a launder, the section having a dovetailed end for engagement with a complementary dovetailed end on another section of a molten-metal-conveying duct.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9113762A GB2257383A (en) | 1991-06-26 | 1991-06-26 | Duct for conveying molten metal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9113762A GB2257383A (en) | 1991-06-26 | 1991-06-26 | Duct for conveying molten metal |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9113762D0 GB9113762D0 (en) | 1991-08-14 |
GB2257383A true GB2257383A (en) | 1993-01-13 |
Family
ID=10697333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9113762A Withdrawn GB2257383A (en) | 1991-06-26 | 1991-06-26 | Duct for conveying molten metal |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2257383A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009093166A1 (en) * | 2008-01-21 | 2009-07-30 | Tenova Pyromet (Proprietary) Limited | Launder assembly and launder section |
CN103884189B (en) * | 2014-04-01 | 2015-10-14 | 顾祥茂 | Tilting-type anode furnace liquid material adding set |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984004471A1 (en) * | 1983-05-09 | 1984-11-22 | Hasle Klinker & Chamott | Pipe for use in systems with hot gases |
EP0149164A2 (en) * | 1984-01-13 | 1985-07-24 | Fried. Krupp Gesellschaft mit beschränkter Haftung | Pouring nozzle consisting of several longitudinal sections for supplying liquid metal into the mould for continuous casting and process of making such a nozzle |
GB2181206A (en) * | 1985-10-01 | 1987-04-15 | Ecc Quarries Ltd | Juxtaposed duct elements |
-
1991
- 1991-06-26 GB GB9113762A patent/GB2257383A/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984004471A1 (en) * | 1983-05-09 | 1984-11-22 | Hasle Klinker & Chamott | Pipe for use in systems with hot gases |
EP0149164A2 (en) * | 1984-01-13 | 1985-07-24 | Fried. Krupp Gesellschaft mit beschränkter Haftung | Pouring nozzle consisting of several longitudinal sections for supplying liquid metal into the mould for continuous casting and process of making such a nozzle |
GB2181206A (en) * | 1985-10-01 | 1987-04-15 | Ecc Quarries Ltd | Juxtaposed duct elements |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009093166A1 (en) * | 2008-01-21 | 2009-07-30 | Tenova Pyromet (Proprietary) Limited | Launder assembly and launder section |
CN103884189B (en) * | 2014-04-01 | 2015-10-14 | 顾祥茂 | Tilting-type anode furnace liquid material adding set |
Also Published As
Publication number | Publication date |
---|---|
GB9113762D0 (en) | 1991-08-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |