CA1279461C - Mold for the continuous casting of beam blanks - Google Patents
Mold for the continuous casting of beam blanksInfo
- Publication number
- CA1279461C CA1279461C CA000524626A CA524626A CA1279461C CA 1279461 C CA1279461 C CA 1279461C CA 000524626 A CA000524626 A CA 000524626A CA 524626 A CA524626 A CA 524626A CA 1279461 C CA1279461 C CA 1279461C
- Authority
- CA
- Canada
- Prior art keywords
- mold
- walls
- section
- expanding
- casting passage
- 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.)
- Expired - Lifetime
Links
- 238000009749 continuous casting Methods 0.000 title claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 46
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 230000008602 contraction Effects 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000013598 vector Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
ABSTRACT
A mold for the continuous casting of beam blanks has a central casting passage bounded by a pair of parallel walls. On either side of the central casting passage is an expanding casting passage which widens in a direction away from the central casting passage and is bounded by a pair of inclined walls diverging from respective ones of the walls of the central casting passage. A terminal casting passage bounded by a pair of side walls parallel to the walls of the central casting passage is located outwardly adjacent to each expanding casting passage. The various casting passages cooperate to define a dogbone-shaped mold cavity. The inclined walls have an angle of inclination no smaller than arc tangent (y/z) where y is the distance from a point on an inclined wall to a transverse center line of the cross section of the mold and z is the distance from such point to a longitudinal center line of the cross section of the mold. Such an angle of inclination results in a beam blank having a shell of increased thickness, strength and uniformity upon exiting from the mold.
A mold for the continuous casting of beam blanks has a central casting passage bounded by a pair of parallel walls. On either side of the central casting passage is an expanding casting passage which widens in a direction away from the central casting passage and is bounded by a pair of inclined walls diverging from respective ones of the walls of the central casting passage. A terminal casting passage bounded by a pair of side walls parallel to the walls of the central casting passage is located outwardly adjacent to each expanding casting passage. The various casting passages cooperate to define a dogbone-shaped mold cavity. The inclined walls have an angle of inclination no smaller than arc tangent (y/z) where y is the distance from a point on an inclined wall to a transverse center line of the cross section of the mold and z is the distance from such point to a longitudinal center line of the cross section of the mold. Such an angle of inclination results in a beam blank having a shell of increased thickness, strength and uniformity upon exiting from the mold.
Description
946~
The invention relates generally to a continuous casting mold.
More particularly, the invention relates to a mold for the continuous cas-ting of beam blanks.
In the steel industry, ~he term "beam blank"
denotes a semifinished product having a dogbone-shaped cross section. A beam blank i5 converted from a semifinished product to a finished product by rolling.
The finished product is an I-beam. -It is known to produce beam blanks by continuously casting a heat of steel into a continuous casting mold having a dogbone-shaped cross section.
Continuous casting has the advantage that a series of beam blanks may be formed from the heat in a continuous operation. This enables energy savings to be achieved and also improves production.
A mold for the continuous casting of beam blanks typically has a central casting passage which is bounded by a pair of parallel walls and is designed to form the web of a beam blank. On either side of the central casting passage is a second casting passage which widens in a direction away from the central casting passage.
These second or expanding casting passages are designed to form the inner flanges of a beam blank. Each of the expanding casting passages merges into a generally rectangular terminal casting passage designed to form the outer flange of a beam blank.
In current rolling mill practice, the expanding inner flanges of a beam blank deflne an angle of 19 with a normal to the longitudinal center line of the dogbone-.: ~ - . . . -.
~'~7946~
shaped cross section. The inclined walls of the mold which bound the expanding casting passages must then intersect such a normal at the same angle. This presents a problem during continuous casting due to the fact that steel contracts as it cools and solidifies. Thus, when the steel adjacent to -the walls of the mold solidifies, contraction of the steel causes the latter to come into frictional contact with the inclined walls of the mold.
The friction increases the rate of wear of the inner surface of the mold so that the life of the mold is shortened. Furthermore, the friction adversely affects the surface quality of the beam blank. In addition, the friction increases the stress required to draw the beam blank out of the mold. The beam blank consists of a relatively large molten core and a relatively thin outer skin or shell upon leaving the mold, and the increased stress increases the likelihood of rupturing the skin.
Rupture of the skin inside the mold is bad for the surface quality of the beam blank while rupture outside of the mold results in a "breakout", i.e., an escape of molten steel from the core of the beam blank.
The beam blank molds in use today also have another drawback associated with the fact that steel contracts as it cools and solidifies. Thus, as steel passes through a mold and is progressively cooled and solidified, the steel tends to pull farther and farther away from the walls of the mold thereby reducing heat transfer and decreasing the efficiency of the mold.
To minimize reductions in heat transfer, it has become the practice to taper the casting passage so that this narrows ;''' .
.~ .
. -, ' ~ - ' ' -.' ' ' ' ' ' 7~
in a direction from the inlet to the outlet of the mold.
This at least partly compensates for contraction of the steel and allows relatively good heat transfer to be maintained. However, present beam blank molds cannot be effectively tapered.
A continuous casting mold according to the invention comprises a first section which includes a pair of first walls defining a Eirst casting passage having opposite open ends. The transverse cross section of the first section has a center, and substantially orthogonal longitudinal and transverse center lines which intersect at the center. The mold further comprises at least one expanding section to one side of the first section and including a pair of second walls defining at least one expanding casting passage which communicates with the first casting passage and has opposite open ends. The second walls are inclined relative to one another in such a manner that the expanding casting passage widens in a direction away from the first casting passage. At least one of the second walls has an angle of inclination no smaller than arc tangent (y/z) where:
y is the distance from a point on this wall to the transverse center line, and z is the distance from such point to the longitudinal center line.
The invention is based on the recognition that an increment of molten metal located adjacent to an inclined wall of a mold will attempt to move towards a - central point, e.gO, the center of the mold, as it -3~ contracts during solidification. The resultant of this ~' .
.
'"' ~' ` ' " ~ ' '' ' ' , ' ~ ' ~ ' ' " , ' .~ , , ~' . ' ' ' lX7~4~
contraction is given by arc tangent (y/z~. Thus, by selecting the angle of inclination to be equal to or greater than arc tangent (y/z), frictional contact between the mold and the solidifying metal will be reduced.
Furthermore, it then becomes possible to taper the mold properly which, in turn, will result in a significant increase in mold performance or efficiency.
The novel features which are considered as characteristic of the invention are set forth in particular in the appended claims~ The continuous casting mold itself, however, both as to its construction and its mode of operation, together with additional features and advantages thereof, will be best understood upon perusal of the following detailed description of certain specific embodiments with reference to the accompanying drawing.
The single Figure is a schematic plan view of a continuous casting beam blank moId according to the invention.
The Figure schematically illustrates a beam blank mold in accordance with the invention. The beam blank mold is designed for the continuous casting of strands having a dogbone-shaped cross section and, to this end, the mold is formed with a dogbone-shaped cavity. The mold has spaced longitudinal ends which are open so that ;- molten metal, e.g., molten steel, may be continuously ~` admitted into one end of the mold while an at least partially solidified strand is continuously withdrawn from the opposite end of the mold.
The moId has a central section 1 which includes a pair of essentially parallel side walls la. The walls - , . .
', : . : ' ' - .
.
',' ' ' 1~:7~6~
la together define a central casting passage lb having a generally rectangular cross section. The width of the central section 1 is denoted by E while its depth is denoted by D.
On either side of the central section 1 is an expanding section 2 which widens in a direction away from the central section 1~ Each of the expanding sections 2 includes a pair of inclined walls 2a which are joined to respective ones of the walls la and diverge from the central section 1. Each pair of inclined walls 2a defines an expanding casting passage 2b which merges into the central casting passage lb.
A terminal or end section 3 outwardly adjoins each of the expanding sections 2. ~ach terminal section 3 includes a pair of side walls 3a which are generally parallel to one another and to the walls la of the central section 1. Each wall 3a is fast with on~ of the walls 2a of an expanding section 2, and the respective pairs of walls 3a define terminal casting passages 3b of generally rectangular cross section. The casting passages 3b merge into the expanding casting passages 2b. Each pair of wide walls 3a is bridged by an end wall 3c which is essentially perpendicular to the respective side walls 3a.
; The terminal sections 3 have depth B. The overall width of the mold is denoted by C.
The mold and its central section 1 have a common transverse center line T which is generally perpendicular to the walls la of the central section 1. Similarly, the mold and its sections 1-3 have a common longitudinal center line L which is substantially parallel to the side .~
~ - 6 -~,~,...
.
,: .', : ':
.
, : :
34~
walls la of the central section 1 and the side walls 3a of the terminal sections 3, and is essentially perpendicular to the end walls 3c of the terminal sections 3. The transverse center line T and lonyitudinal center line L
intersect at the center P of the mold and the central section 1.
The expanding sections 2 are mirror symmetrically arranged about the transverse center line T
and the central section 1. The same holds true for the 1~ terminal sections 3. It will be observed that each of the walls 2a of the expanding sections 2 connects a side wall 3a of a terminal section 3 to a side wall la of the central section 1.
Each of the casting passages lb 2b,3b has spaced longitudinal ends which are open, and the various casting passages lb,2b,3b cooperate to define the dogbone-shaped cavity of the mold.
The walls la,2a,3a,3c are composed of copper or a copper alloy in accordance with current practice.
An increment of metal located adjacent to any point ~ of an inclined wall 2a attempts to move towards the transvarse center line T and the longitudinal center line L as it contracts during cooling. The resultant vector of the attempted contraction extends from the point ; A to the center P of the mold.
In a conventional beam blank mold, the angle alpha defined by an inclined wall 2a and a normal to the longitudinal center line L of the mold is so small, i.e., the inclined wall 2a is so steep, that an increment of 30- metal adjacent to the inclined wall 2a is unable to move 7946~ :
towards the center P of the mold. The walls 2a to the left of the center P extend to the left of the respective resultant contraction vectors while the walls 2a to the right of the center P extend to the right of the - respective resultant contraction vectors. In either case, an increment of metal adjacent to an inclined wall 2a is prevented from moving in the direction of the resultant contraction vector because the inclined wall 2a is located between the metal and the vector. The attempt to move towards the center P of the mold brings the metal into frictional contact with the inclined wall 2a since one of the components of movement is towards the transverse center line T, and hence towards the inclined wall 2a.
According to the invention, the angle alpha deined by an inclined wall 2a and a normal to the longitudinal center line L of the mold is equal to or greater than Arc tangent (y/z) where:
~ is the distance from any point A on an inclined wall 2a to the transverse center line T of the mold; and z is the distance from the point A to the longitudinal center line L of the mold.
When alpha = arc tangent (y/z) for an inclined wall 2a, the latter coincides with the resultant contraction vector so that an increment of metal adjacent to the inclined wall 2a is free to move in the direction of such vector. The metal then does not move into the -~ 30 inclined wall 2a which reduces the friction between : .
:~ ' ~ - 8 -.
~ ~ ' .
:- : , - . . ,. : . . :
- . : : . - : . .:
. - ' . ~': :, . , :, . : . ' -: ' : . , . :
: , : .
. .
.: , ~79~6~
the metal and the inclined wall 2aO The same effect is obtained when alpha exceeds arc tangent (y/z). In this case, the inclined walls 2a to the left of the center P
of the mold are disposed to the right of the respective resultant contraction vectors whereas the inclined walls 2a to -the right of the center P are located to the left of the respective resultant contraction vectors. An increment of metal adjacent to an inclined wall 2a is accordingly not blocked from the respective resultant contraction vector by the wall 2a.
The angle alpha is not influenced by the magnitude of the contraction which may be controlled by adjusting the dimensions B, C and D.
The mold of the invention makes it possible to produce a continuously cast beam blank which, upon leaving the mold, has a shell of increased thiclcness, strength and uniformity. This is due to the fact that the angle alpha in accordance with the invention results in reduced friction between the beam blank and the mold, and the fact that such angle alpha allows the dogbone-shaped cavity of the mold to be properly tapered.
, .
.. :, , .
,. : : ,
The invention relates generally to a continuous casting mold.
More particularly, the invention relates to a mold for the continuous cas-ting of beam blanks.
In the steel industry, ~he term "beam blank"
denotes a semifinished product having a dogbone-shaped cross section. A beam blank i5 converted from a semifinished product to a finished product by rolling.
The finished product is an I-beam. -It is known to produce beam blanks by continuously casting a heat of steel into a continuous casting mold having a dogbone-shaped cross section.
Continuous casting has the advantage that a series of beam blanks may be formed from the heat in a continuous operation. This enables energy savings to be achieved and also improves production.
A mold for the continuous casting of beam blanks typically has a central casting passage which is bounded by a pair of parallel walls and is designed to form the web of a beam blank. On either side of the central casting passage is a second casting passage which widens in a direction away from the central casting passage.
These second or expanding casting passages are designed to form the inner flanges of a beam blank. Each of the expanding casting passages merges into a generally rectangular terminal casting passage designed to form the outer flange of a beam blank.
In current rolling mill practice, the expanding inner flanges of a beam blank deflne an angle of 19 with a normal to the longitudinal center line of the dogbone-.: ~ - . . . -.
~'~7946~
shaped cross section. The inclined walls of the mold which bound the expanding casting passages must then intersect such a normal at the same angle. This presents a problem during continuous casting due to the fact that steel contracts as it cools and solidifies. Thus, when the steel adjacent to -the walls of the mold solidifies, contraction of the steel causes the latter to come into frictional contact with the inclined walls of the mold.
The friction increases the rate of wear of the inner surface of the mold so that the life of the mold is shortened. Furthermore, the friction adversely affects the surface quality of the beam blank. In addition, the friction increases the stress required to draw the beam blank out of the mold. The beam blank consists of a relatively large molten core and a relatively thin outer skin or shell upon leaving the mold, and the increased stress increases the likelihood of rupturing the skin.
Rupture of the skin inside the mold is bad for the surface quality of the beam blank while rupture outside of the mold results in a "breakout", i.e., an escape of molten steel from the core of the beam blank.
The beam blank molds in use today also have another drawback associated with the fact that steel contracts as it cools and solidifies. Thus, as steel passes through a mold and is progressively cooled and solidified, the steel tends to pull farther and farther away from the walls of the mold thereby reducing heat transfer and decreasing the efficiency of the mold.
To minimize reductions in heat transfer, it has become the practice to taper the casting passage so that this narrows ;''' .
.~ .
. -, ' ~ - ' ' -.' ' ' ' ' ' 7~
in a direction from the inlet to the outlet of the mold.
This at least partly compensates for contraction of the steel and allows relatively good heat transfer to be maintained. However, present beam blank molds cannot be effectively tapered.
A continuous casting mold according to the invention comprises a first section which includes a pair of first walls defining a Eirst casting passage having opposite open ends. The transverse cross section of the first section has a center, and substantially orthogonal longitudinal and transverse center lines which intersect at the center. The mold further comprises at least one expanding section to one side of the first section and including a pair of second walls defining at least one expanding casting passage which communicates with the first casting passage and has opposite open ends. The second walls are inclined relative to one another in such a manner that the expanding casting passage widens in a direction away from the first casting passage. At least one of the second walls has an angle of inclination no smaller than arc tangent (y/z) where:
y is the distance from a point on this wall to the transverse center line, and z is the distance from such point to the longitudinal center line.
The invention is based on the recognition that an increment of molten metal located adjacent to an inclined wall of a mold will attempt to move towards a - central point, e.gO, the center of the mold, as it -3~ contracts during solidification. The resultant of this ~' .
.
'"' ~' ` ' " ~ ' '' ' ' , ' ~ ' ~ ' ' " , ' .~ , , ~' . ' ' ' lX7~4~
contraction is given by arc tangent (y/z~. Thus, by selecting the angle of inclination to be equal to or greater than arc tangent (y/z), frictional contact between the mold and the solidifying metal will be reduced.
Furthermore, it then becomes possible to taper the mold properly which, in turn, will result in a significant increase in mold performance or efficiency.
The novel features which are considered as characteristic of the invention are set forth in particular in the appended claims~ The continuous casting mold itself, however, both as to its construction and its mode of operation, together with additional features and advantages thereof, will be best understood upon perusal of the following detailed description of certain specific embodiments with reference to the accompanying drawing.
The single Figure is a schematic plan view of a continuous casting beam blank moId according to the invention.
The Figure schematically illustrates a beam blank mold in accordance with the invention. The beam blank mold is designed for the continuous casting of strands having a dogbone-shaped cross section and, to this end, the mold is formed with a dogbone-shaped cavity. The mold has spaced longitudinal ends which are open so that ;- molten metal, e.g., molten steel, may be continuously ~` admitted into one end of the mold while an at least partially solidified strand is continuously withdrawn from the opposite end of the mold.
The moId has a central section 1 which includes a pair of essentially parallel side walls la. The walls - , . .
', : . : ' ' - .
.
',' ' ' 1~:7~6~
la together define a central casting passage lb having a generally rectangular cross section. The width of the central section 1 is denoted by E while its depth is denoted by D.
On either side of the central section 1 is an expanding section 2 which widens in a direction away from the central section 1~ Each of the expanding sections 2 includes a pair of inclined walls 2a which are joined to respective ones of the walls la and diverge from the central section 1. Each pair of inclined walls 2a defines an expanding casting passage 2b which merges into the central casting passage lb.
A terminal or end section 3 outwardly adjoins each of the expanding sections 2. ~ach terminal section 3 includes a pair of side walls 3a which are generally parallel to one another and to the walls la of the central section 1. Each wall 3a is fast with on~ of the walls 2a of an expanding section 2, and the respective pairs of walls 3a define terminal casting passages 3b of generally rectangular cross section. The casting passages 3b merge into the expanding casting passages 2b. Each pair of wide walls 3a is bridged by an end wall 3c which is essentially perpendicular to the respective side walls 3a.
; The terminal sections 3 have depth B. The overall width of the mold is denoted by C.
The mold and its central section 1 have a common transverse center line T which is generally perpendicular to the walls la of the central section 1. Similarly, the mold and its sections 1-3 have a common longitudinal center line L which is substantially parallel to the side .~
~ - 6 -~,~,...
.
,: .', : ':
.
, : :
34~
walls la of the central section 1 and the side walls 3a of the terminal sections 3, and is essentially perpendicular to the end walls 3c of the terminal sections 3. The transverse center line T and lonyitudinal center line L
intersect at the center P of the mold and the central section 1.
The expanding sections 2 are mirror symmetrically arranged about the transverse center line T
and the central section 1. The same holds true for the 1~ terminal sections 3. It will be observed that each of the walls 2a of the expanding sections 2 connects a side wall 3a of a terminal section 3 to a side wall la of the central section 1.
Each of the casting passages lb 2b,3b has spaced longitudinal ends which are open, and the various casting passages lb,2b,3b cooperate to define the dogbone-shaped cavity of the mold.
The walls la,2a,3a,3c are composed of copper or a copper alloy in accordance with current practice.
An increment of metal located adjacent to any point ~ of an inclined wall 2a attempts to move towards the transvarse center line T and the longitudinal center line L as it contracts during cooling. The resultant vector of the attempted contraction extends from the point ; A to the center P of the mold.
In a conventional beam blank mold, the angle alpha defined by an inclined wall 2a and a normal to the longitudinal center line L of the mold is so small, i.e., the inclined wall 2a is so steep, that an increment of 30- metal adjacent to the inclined wall 2a is unable to move 7946~ :
towards the center P of the mold. The walls 2a to the left of the center P extend to the left of the respective resultant contraction vectors while the walls 2a to the right of the center P extend to the right of the - respective resultant contraction vectors. In either case, an increment of metal adjacent to an inclined wall 2a is prevented from moving in the direction of the resultant contraction vector because the inclined wall 2a is located between the metal and the vector. The attempt to move towards the center P of the mold brings the metal into frictional contact with the inclined wall 2a since one of the components of movement is towards the transverse center line T, and hence towards the inclined wall 2a.
According to the invention, the angle alpha deined by an inclined wall 2a and a normal to the longitudinal center line L of the mold is equal to or greater than Arc tangent (y/z) where:
~ is the distance from any point A on an inclined wall 2a to the transverse center line T of the mold; and z is the distance from the point A to the longitudinal center line L of the mold.
When alpha = arc tangent (y/z) for an inclined wall 2a, the latter coincides with the resultant contraction vector so that an increment of metal adjacent to the inclined wall 2a is free to move in the direction of such vector. The metal then does not move into the -~ 30 inclined wall 2a which reduces the friction between : .
:~ ' ~ - 8 -.
~ ~ ' .
:- : , - . . ,. : . . :
- . : : . - : . .:
. - ' . ~': :, . , :, . : . ' -: ' : . , . :
: , : .
. .
.: , ~79~6~
the metal and the inclined wall 2aO The same effect is obtained when alpha exceeds arc tangent (y/z). In this case, the inclined walls 2a to the left of the center P
of the mold are disposed to the right of the respective resultant contraction vectors whereas the inclined walls 2a to -the right of the center P are located to the left of the respective resultant contraction vectors. An increment of metal adjacent to an inclined wall 2a is accordingly not blocked from the respective resultant contraction vector by the wall 2a.
The angle alpha is not influenced by the magnitude of the contraction which may be controlled by adjusting the dimensions B, C and D.
The mold of the invention makes it possible to produce a continuously cast beam blank which, upon leaving the mold, has a shell of increased thiclcness, strength and uniformity. This is due to the fact that the angle alpha in accordance with the invention results in reduced friction between the beam blank and the mold, and the fact that such angle alpha allows the dogbone-shaped cavity of the mold to be properly tapered.
, .
.. :, , .
,. : : ,
Claims (12)
1. A mold for the continuous casting of beam blanks comprising:
(a) a first section including a pair of first walls defining a first casting passage having opposite open ends, the transverse cross section of said first section having a center, and substantially orthogonal longitudinal and transverse center lines which intersect at said center; and (b) at least one expanding section to one side of said first section and including a pair of second walls defining at least one expanding casting passage which communicates with said first casting passage and has opposite open ends, said second walls being inclined relative to one another in such a manner that said one expanding casting passage widens in a direction away from said first casting passage, and at least one of said second walls having an angle of inclination no smaller than arc tangent (y/z) where:
y is the distance from a point on said one second wall to said transverse center line, and z is the distance from said point to said longitudinal center line.
(a) a first section including a pair of first walls defining a first casting passage having opposite open ends, the transverse cross section of said first section having a center, and substantially orthogonal longitudinal and transverse center lines which intersect at said center; and (b) at least one expanding section to one side of said first section and including a pair of second walls defining at least one expanding casting passage which communicates with said first casting passage and has opposite open ends, said second walls being inclined relative to one another in such a manner that said one expanding casting passage widens in a direction away from said first casting passage, and at least one of said second walls having an angle of inclination no smaller than arc tangent (y/z) where:
y is the distance from a point on said one second wall to said transverse center line, and z is the distance from said point to said longitudinal center line.
2. The mold of claim 1, comprising an additional expanding section which includes a pair of additional walls defining an additional expanding casting passage communicating with said first casting passage and having opposite open ends, said expanding sections being located on opposite sides of said first section, and said additional walls being inclined relative to one another in such a manner that said additional expanding casting passage widens in a direction away from said first casting passage, at least one of said additional walls having an angle of inclination no smaller than arc tangent (y/z).
3. The mold of claim 2, comprising at least one end section which is disposed on a side of said one expanding section remote from said first section, said one end section having a pair of side walls defining a terminal casting passage which communicates with said one expanding casting passage and has opposite open ends.
4. The mold of claim 3, comprising an additional end section which is disposed on a side of said additional expanding section remote from said first section, said additional end section having a pair of side walls defining an additional terminal casting passage which communicates with said additional expanding casting passage and has opposite open ends.
5. The mold of claim 4, wherein each of said second walls and each of said additional walls has an angle of inclination no smaller than arc tangent (y/z).
6. The mold of claim 4, wherein said casting passages together define a substantially dogbone-shaped cavity.
7. The mold of claim 4, wherein said end sections and said expanding sections are substantially symmetrically arranged about said first section.
8. The mold of claim 4, wherein each of said walls of said expanding sections joins one of said side walls to one of said first walls.
9. The mold of claim 4, wherein each of said end sections has an end wall which bridges the respective side walls.
10. The mold of claim 9, wherein said end walls are substantially normal to said longitudinal center line.
11. The mold of claim 4, wherein said first walls and said side walls are substantially parallel to said longitudinal center line.
12. The mold of claim 4, wherein said walls are constituted by copper or copper alloy.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US83493586A | 1986-02-28 | 1986-02-28 | |
| US834,935 | 1986-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1279461C true CA1279461C (en) | 1991-01-29 |
Family
ID=25268163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000524626A Expired - Lifetime CA1279461C (en) | 1986-02-28 | 1986-12-05 | Mold for the continuous casting of beam blanks |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1279461C (en) |
-
1986
- 1986-12-05 CA CA000524626A patent/CA1279461C/en not_active Expired - Lifetime
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Effective date: 20121205 |