Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1988-07-28
1990-04-03
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164423, 164429, 164479, B22D 1106
Patent
active
049132199
DESCRIPTION:
BRIEF SUMMARY
The invention is concerned with a process for casting and a casting device for strip and foil from metal or metal oxide melts.
A considerable fraction of industrially used metal or metal oxide sheet is required in the form of thin sheet or foil. There is hence a notable effort directed to processes and devices for the direct fabrication of such thin sheet or foil by avoiding traditional casting and rolling techniques. As recent efforts in this direction have shown, thin metal or metal oxide strip and foil may be produced directly from the melt, whereby on the one hand considerable energy saving can be effected as compared with conventional processes, and on the other hand properties can be obtained in the product which cannot be realized with conventional casting processes. Sheet and foil with amorphous, nano/microcrystalline structure or even a combined structure, e.g. amorphous in certain regions and crystalline in others, can only be fabricated with the newly developed process or device.
For instance, processes and devices are known for directly casting metal melts onto moving cooling bodies, whereby usually a cooling drum or a moving cooling belt are employed. The metal melt is thereby cast onto the surface of the cooling drum or belt through a nozzle-like applicator element. The most important process parameters for the casting process are the velocity of the movement of the surface of the cooling body relative to the casting nozzle, the heat conduction from the strip to the cooling body and the further important parameter of the nozzle geometry.
Together with the gap between the nozzle and the surface of the cooling body, the width of the casting slit in the casting device is also of decisive influence on the casting process. The geometry of the casting slit was also considered to be of considerable importance in the previous development. Efforts to improve the casting process have thus also been directed to the shaping and sizing of the nozzle aperture and the gap between the nozzle aperture and the surface of the cooling body. Common to nearly all known suggestions is that the metal melt flows under gravity from a melt vessel into the nozzle and the casting slit. This gravity-dependent flow of the metal to the nozzle was at most assisted in the modern strip casting technique by a controllable pressure system. For this reason, considerable restrictions had to be observed on sizing the nozzle aperture and the region between nozzle aperture and the surface of the cooling body in order to secure perfect casting and to prevent an uncontrolled run-out or freezing of the melt at the casting slit before the actual casting operation.
From the DE-OS 3 411 466, for example, a process is known for the fabrication of thin metal strip, in which the application angle between the flow direction of the melt leaving the nozzle and the casting surface is reported to lie between 20 and 80 degrees. According to DE-OS 3 442 009, a nozzle configuration for casting thicker strip was suggested in which several nozzle slits are arranged in a row in the casting direction. By this means, thicker strip should result from sequential multiple applications of the melt when the separation of the nozzle slits from each other and the width of the nozzle slits are suitable.
It is the aim of the present invention to create a process and a device for casting strip or foil from metal or metal oxide melts which lead to cast products with improved quality and to a simpler and cheaper device for melt application to the cooling body. Furthermore, the melt application device shall permit the fabrication of larger cast formats, especially a multiplication of the width of the strip which can be produced.
This aim is fulfilled according to this patent by the sum of the features in the patent claims 1 and 5.
Despite the lateral melt feed according to the invention, cast products may be produced with excellent surface quality and of unusually uniform thickness, also in the edge regions. As a result of the relatively simple and robust design of th
REFERENCES:
patent: 4271257 (1980-09-01), Narasimhan
patent: 4566525 (1986-01-01), Li et al.
LandOfFree
Process and device for casting thin strip or foil from the melt does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and device for casting thin strip or foil from the melt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and device for casting thin strip or foil from the melt will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1351252