U.S. patent application number 11/587221 was filed with the patent office on 2007-12-20 for device for accommodating a continuous casting mold on an elevating table.
Invention is credited to Juergen Mueller, Axel Stavenow, Axel Weyer.
Application Number | 20070289716 11/587221 |
Document ID | / |
Family ID | 34963802 |
Filed Date | 2007-12-20 |
United States Patent
Application |
20070289716 |
Kind Code |
A1 |
Weyer; Axel ; et
al. |
December 20, 2007 |
Device for Accommodating a Continuous Casting Mold on an Elevating
Table
Abstract
A device for accommodating a continuous casting mold (1) on an
elevating table for casting molten metals, in particular molten
steel materials, which is set in an oscillatory motion with several
hydraulic oscillation drives, is modified from having two separate
elevating table sides so that the elevating table (8) is formed as
one-piece frame-shaped table with an inner space (8a) for passing
through the cast strand (4) and correspondingly dimensioned, and in
that the oscillation drives (3) are arranged in corners (8b) inside
a frame surface (8c) and are controlled in a fully synchronized
manner with a lateral pairwise offset with regard to an arched, or
together, for a perpendicular straight, draw-out movement.
Inventors: |
Weyer; Axel; (Wuppertal,
DE) ; Mueller; Juergen; (Kaarst, DE) ;
Stavenow; Axel; (Dusseldorf, DE) |
Correspondence
Address: |
Alexander Zinchuk;Abelman Frayne and Schwab
666 Third Avenue
New York
NY
10017-5621
US
|
Family ID: |
34963802 |
Appl. No.: |
11/587221 |
Filed: |
April 8, 2005 |
PCT Filed: |
April 8, 2005 |
PCT NO: |
PCT/EP05/03726 |
371 Date: |
July 6, 2007 |
Current U.S.
Class: |
164/416 |
Current CPC
Class: |
B22D 11/053
20130101 |
Class at
Publication: |
164/416 |
International
Class: |
B22D 11/053 20060101
B22D011/053 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 24, 2004 |
DE |
10 2004 020 130.7 |
Claims
1. A device for accommodating a continuous casting mold (1) on an
elevating table (2) for casting molten metals, in particular molten
steel materials, which is set in an oscillatory motion with several
hydraulic oscillation drives (3) during drawing out of a partially
solidified cast strand (4), wherein frequency and amplitude are
adapted to a respective cross-section (5), e.g., of slab, thin
strand, bloom, beam blank or billet strand cross-section (5), and
to a respective cast material and/or cast parameter such as, e.g.,
cast speed, guide member (6) are connected with stationary
articulated means (7) for an optimal oscillation curve of the
elevating table, characterized in that the elevating table (8) is
formed as one-piece frame-shaped table with an inner space (8a) for
passing through the cast strand (4) and correspondingly
dimensioned, and in that the oscillation drives (3) are arranged in
corners (8b) inside a frame surface (8c) and are controlled in a
fully synchronized manner with a lateral pairwise offset with
regard to an arched, or together, for a perpendicular straight
draw-out movement.
2. A device according to claim 1, characterized in that the
continuous casting mold (1) with its cooling units (1a) is directly
placed on the frame-shaped elevating table (8).
3. A device according to claim 1, characterized in that the
frame-shaped elevating table (8) is provided with cooling channels
connected with a cooling medium network.
4. A device according to claim 1, characterized in that the
stationary articulation means (7) of the guide members (6) consists
of leaf springs (7a) in form of an assembly (7b) hingedly supported
on the elevating table (8) and a stationary base frame (11).
Description
[0001] The present invention relates to a device for accommodating
a continuous casting mold on an elevating table for casting molten
metals, in particular molten steel materials, which is set in an
oscillatory motion with several hydraulic oscillation drives during
drawing out of a partially solidified cast strand, wherein
frequency and amplitude are adapted to a respective cross-section,
e.g., of slab, thin strand, bloom, beam blank or billet strand
cross-section, and to a respective cast material and/or cast
parameter (cast speed), and guide members are connected with
stationary articulated means for an optimal oscillation curve of
the elevating table.
[0002] The above-described device is disclosed in EP 1 029 616 A1.
This device serves in particular for casting thin strands from
steel. It includes an oscillating continuous casting mold
positioned on two elevating tables arranged on opposite sides of
the cast strand. The oscillation drive is formed by piston-cylinder
units in form of servocylinders supported on a base frame. Each
elevating table side is hingedly connected with a head of a
piston-cylinder unit. The foots of the piston cylinder units are
hingedly connected, respectively, with the base frame. Each
elevating table side is guided with respect to the base frame with
a hingedly connected guide bar. The axes of the hinges and of
hinges at the heads of the piston-cylinder units and the axes of
the hinges of the guide bars extend parallel to each other.
[0003] Periodic oscillation movements of the continuous casting
mold cause friction between the continuous casting mold and the
cast strand or its strand shell and which can be prevented with
lubricating anti-seizure means. At different speeds between the
continuous casting mold and the cast speed, an oscillating
excitation of the entire cast strand and/or the bath level in the
continuous casting mold take place, in particular at sinusoidal
oscillations, which is undesirable. Such oscillation can be damped
with oscillation curves that deviate from sinusoidal curves. Such
deviating curves advantageously influence also oscillation marks,
their depth and shape on the strand surface and improve the surface
quality.
[0004] A prerequisite for generation and transmission of suitable
oscillation curves is the construction and the system of the device
itself that accommodates the continuous casting mold. The
generation of oscillation (e.g., described in EP 0 121 622 B1) is
effected with a function generator which produces oscillations with
a preselected oscillation amplitude signal at a frequency that is
greater than the natural frequency of the device.
[0005] An object of the invention is to provide a combination of an
elevating table and a continuous casting mold and which would be
capable to provide for transmission of functionally correct
oscillations with a high precision.
[0006] The stated object is achieved according to the invention by
forming the elevating table as a one-piece frame-shaped table with
an inner space for passing through the cast strand and
correspondingly dimensioned, and in that the oscillation drives are
arranged in corners inside a frame surface and are controlled in a
fully synchronized manner with a lateral pairwise offset with
regard to an arched, or together, for a perpendicular straight,
draw-out motion. Thereby an increased stiffness of the device is
achieved, so that the influence of the device on the oscillation
behavior of the continuous casting mold has changed in such a way
that critical frequencies are not reached any more, and the
predetermined frequencies and amplitudes are reliably and precisely
implemented. The practical experience has shown that a complete
synchronization of two or more hydraulic drives can be achieved. An
overall low height of the device, e.g., contributes thereto. In
addition, another advantage is a possibility of subsequent
modernization of the existing devices into new ones.
[0007] According to one of the embodiments, the continuous casting
mold with its cooling units is directly placed on the frame-shaped
elevating table. The frame-shaped elevating table provides
therefore a satisfactory bearing surface.
[0008] According to a further development, the frame-shaped
elevating table is provided with cooling channels connected with a
cooling medium network. The advantage consists in a narrow inner
space of rings about the cast strand cross-section with a small
spacing. At a smaller cooling capacity, the spacing from a hot cast
strand is increased. In addition, the cooling capacity is increased
to a certain extent as a result of the otherwise available, spray
cooling.
[0009] A further improvement consists in that the stationary
articulation means of the guide members consists of leaf springs in
form of an assembly hingedly supported on the elevating table and a
stationary base frame.
[0010] In the drawing, an embodiment, which will be described in
detail below, is shown.
[0011] The single drawing FIGURE shows a perspective view of a
combination continuous casting mold/elevating table which are
supported on a base frame.
[0012] A device for accommodating a continuous casting mold 1 with
a water box 1a and a narrow side 1b includes, according to the
state of the art, two separate elevating tables 2 and 2 for casting
molten metals, in particular molten steel materials. The elevating
tables 2, 2 are set in an oscillatory motion by several oscillation
drives 3 upon drawing out of a partially solidified cast strand 4.
The frequency and the amplitude are adapted to a strand
cross-section 5 of, e.g., slab strand, thin strand, bloom strand,
beam blank strand or billet strand, cross-section 5 and in
accordance with a respective cast material. In addition, there are
provided guide members 6 which connect the elevating tables 2, 2
with a stationary articulation joint 7 for an optimal oscillation
curve.
[0013] The present invention modifies the known system by formation
of one-piece, frame-shaped elevating table 8. Therefore, the
elevating table 8 has an inner space 8a which is kept open for
passing of the cast strand 4 and is accordingly dimensioned. The
oscillation drives 3 are formed as piston-cylinder units 3a, with
those formed as servo-cylinder units 3b being arranged in corners
8b inside the frame surface 8c, and are controlled with a pairwise
lateral offset with regard to an arched, or together, for a
perpendicular, straight, draw-out movement 9. The synchronization
of two or more hydraulic drives was proved to be practical with
such a construction and is, therefore, possible. The deviation of
several hundredth mm between both elevating table sides can be
achieved.
[0014] The so-formed elevating table 8 lifts the continuous casting
mold 1 with all its cooling units 10 and, therefore, can be easily
formed as a frame-shaped elevating table 8.
[0015] For protection from the radiating heat of the cast strand 4,
the frame-shaped elevating table 8 is provided with cooling
channels connected with a cooling medium network.
[0016] From many possible embodiments of guide means of the
elevating table 8, an advantageous construction was selected
according to which the articulated join of the guide members 6 is
formed of leaf springs 7a in form of spring assemblies 7b hingedly
supported on the elevating table 8 and a stationary base frame
11.
LIST OF REFERENCE NUMERALS
[0017] 1. Continuous Casting Mold [0018] 1a. Water box [0019] 1b.
Narrow side [0020] (2, 2. Known elevating tables) [0021] 3.
Oscillation drive [0022] 3a. Piston-cylinder unit [0023] 3b.
Servo-cylinder unit [0024] 4. (partially solidified) cast strand
[0025] 5. Strand cross-section [0026] 6. Guide member [0027] 7.
Stationary articulated joint [0028] 7a. Leaf spring [0029] 7b.
Assembly [0030] 8. Frame-shaped one-piece elevating table [0031]
8a. Inner space [0032] 8b. Corners [0033] 8c. Frame surface [0034]
9. Draw-out movement [0035] 10. Cooling units [0036] 11. Base
frame
* * * * *