CA2057166A1 - Process for producing continuously cast bar having helical contour and apparatus therefor - Google Patents
Process for producing continuously cast bar having helical contour and apparatus thereforInfo
- Publication number
- CA2057166A1 CA2057166A1 CA 2057166 CA2057166A CA2057166A1 CA 2057166 A1 CA2057166 A1 CA 2057166A1 CA 2057166 CA2057166 CA 2057166 CA 2057166 A CA2057166 A CA 2057166A CA 2057166 A1 CA2057166 A1 CA 2057166A1
- Authority
- CA
- Canada
- Prior art keywords
- mold
- bar
- casting
- helical
- wall surface
- 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.)
- Abandoned
Links
Classifications
-
- 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
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A process for continuously casting a bar having a helical groove which comprises casting a bar in a mold for continuous casting which has a helical inner wall surface or has a groove or protrusion helically cut on its inner wall surface while rotating and drawing the bar in conformity with the slope of the helix, and a continuous casting apparatus therefor.
A process for continuously casting a bar having a helical groove which comprises casting a bar in a mold for continuous casting which has a helical inner wall surface or has a groove or protrusion helically cut on its inner wall surface while rotating and drawing the bar in conformity with the slope of the helix, and a continuous casting apparatus therefor.
Description
FIELD OF T~E INVENTION
The present invention relates to a process for producing a continuously cast bar which has a helical groove and is substantially free from defects on the inner and outer surfaces thereof, and to an apparatus for the process.
DESCRIPTION OF THE PRIOR ART
For obtaining a long bar having a helical groove, there are already known, or example, a method which comprises first preparing a thick bar by casting or the like, worklng it into a sguare-shaped bar or a bar having a rectilineal groove by means of an extruder, etc. and then giving a twist to the bar at its both ends, and a method which comprises grooving a helix continuously on the surface of a bar by means of rolling or the like.
Although it is also possible by these conventional methods to obtain a long bar having a 20 continuous helical groove by supplying a raw material bar continuously during the extrusion, it is difficult to avoid staining at the joint surface due to lubricant used in the extrusion or to avoid structural change, etc.
1 Although it is also possible to bond the respective end faces by welding or the like after completion of an extrusion, the inspection and the detection of defects, if any, at the bond portlon require much time and trouble, and further the deformation of the helical groove at the bond portion necessitates complicated and difficult work for readjusting it.
SU~MARY OF THE INVENTION
According to the present invention, there are provided a process for continuously casting a bar having a helical groove which comprises casting a bar in a mold for continuous casting which has a helical inner wall surface or has a groove or protrusion helically cut on its inner wall surface while rotating and drawing the bar in conformity with the slope of the helix; a mold for continuous casting having a monolithic structure or combined structure, which has a molten metal-supplying - part and a heating unit attached to the inside or outside of the mold and in which the inner wall surface on the side of the molten metal-supplying part or the whole of the mold is heated above the solidification temperature of a metal to be cast with the heating unit and the side of the mold for taking off a continuously cast bar is cooled below the solidification temperature;
a continuous casting process using the above mold, and an apparatus for the continuous casting.
~ ~rrl~
Fig. 1 is a sectional side view of a casting apparatus with combined heating and cooling units in a situation at the beginning of a continuous casting.
Fig. 2 is a sectional side view of a casting apparatus in casting operation and a sketch drawing of a continuously cast bar formed.
PREFERRED EMBGDIMENTS OF THE INVENTION
The present invention will be described in detail below.
Although the present invention can be applied to all kinds of metals and their alloys, a body to be cast immediately after solidification is required to bear a shearing force caused by the rotation of the mold or the rotation of the cast body itself, 90 that the invention is more suitably applied to pure metals or systems containing a small amount of an alloy.
A helical cast bar can be obtained by drawing a body to be cast while rotating it in conformity with the slope of the helix. When a longer bar is to be cast, the cast body may be taken up around a jig such as a spool or bobbin while being rotated together with the jig. A cast bar having a helical groove can be also obtained continuously by drawing the cast bar while rotating the mold in conformity with the slop of the helix, instead of rotating the cast bar itself.
1 In the present invention, a cast bar may be rotated by, for example, rotating the moldr rotating a jig for taking up the cast bar or rotating a molten metal-holding part for supplying molten metal and the 5 mold part as one body as well as rotating the cast bar itself.
When a long bar having a helical groove is of a small diameter or when the pitch of the helix is minute, the mold for continuous casting is desirably the 10 one which can ~chieve unidirectional solidification in the opposite direction to the casting direction and besides in which the shape of freezing interface is pre-ferably such that solidification on the surface of t:he cast bar is delayed behind solidification at the center 15 portion thereof-For this purpose, it is effective that themold is constructed of a cooling part to be cooled at temperatures lower than the freezing temperature of the metal to be cast and a heating part to be heated at temperatures higher than the freezing temperature. It is also effective for the purpose of increasing a temperature difference between the cooing and heating parts to highten cooling effect by, for example, pouring water directly onto the cast bar.
The larger the temperature difference between the heating and cooling parts, the more the unidirec-tional solidification is ensured. To attain this object, it is necessary to provide a insulating layer h l.~ 7 ~
1 between the two parts.
The heating part can be maintained above the freezing temperature of the molten metal by heat transferred from the molten metal-holding part, which, however, is not always satisfactory for achieving complete unidirectional solidification even when a heat insulating layer is provided between the heating part and the cooling part. Therefore, the heating unit is preferably provided in the inside or outside of the mold. Examples of heating units usable for such purpose include one which makes use of resistance heating and one which uses an induction heating.
By conducting the continuous casting with a mold having a heating part~ insulating part and cooling lS part as mentioned above while conducting the rotation in conformity with the slope of helix, a continuously cast bar having a helical groove can be easily produced through a simple process step~
Although the shape of the cross-section of the mold is basically a circle in the present invention, it is not critical and may be also any one of polygons such as triangles, etc. For example, when the cross-section of the mold is rectangular and the inner wall surface of the mold is helical, bars having helical appearance can be obtained. When the cross-section is circular, continuously cast bars having a helical groove can be obtained by use of a mold having a groove or protrusion hPlically cut on its inner wall surface.
~ t~ 3 1 The shape of the helical groove of the continuously cast bar obtainable in the present invention may be any desired one as long as it permits drawing of the cast bar.
Example Fig. 1 shows an example of a casting apparatus for embodying the process of the present invention in a situation at the beginning of casting. A molten metal-holding furnace 1 is provided with a heating unit 2 and a molten metal-holding crucible 3, and molten aluminum 4 is held therein. To the side wall of the molten-met:al holding crucible is attached a combined mold provided with a graphite-made heating part 5 having a built-in mold heater 8, a copper-made mold-cooling part 6 whose inside is cooled by water and an asbestos cloth insulat-ing part 7 of 1 mm thickness which prevents heat trans-fer between part 5 and part 6.
Although the mold is attached sideways in the present invention, subsequent operations can be con-ducted in completely the ~ame manner as above also whena similar mold is attached to the bottom part of the crucible right downward. The mold has an inner diameter of 30 mm, on the inner wall of which is cut one line of helical protrusion 10 having a triangular cross-section of 5 mm height and 10 mm base length in a pitch of 60 mm.
The present invention relates to a process for producing a continuously cast bar which has a helical groove and is substantially free from defects on the inner and outer surfaces thereof, and to an apparatus for the process.
DESCRIPTION OF THE PRIOR ART
For obtaining a long bar having a helical groove, there are already known, or example, a method which comprises first preparing a thick bar by casting or the like, worklng it into a sguare-shaped bar or a bar having a rectilineal groove by means of an extruder, etc. and then giving a twist to the bar at its both ends, and a method which comprises grooving a helix continuously on the surface of a bar by means of rolling or the like.
Although it is also possible by these conventional methods to obtain a long bar having a 20 continuous helical groove by supplying a raw material bar continuously during the extrusion, it is difficult to avoid staining at the joint surface due to lubricant used in the extrusion or to avoid structural change, etc.
1 Although it is also possible to bond the respective end faces by welding or the like after completion of an extrusion, the inspection and the detection of defects, if any, at the bond portlon require much time and trouble, and further the deformation of the helical groove at the bond portion necessitates complicated and difficult work for readjusting it.
SU~MARY OF THE INVENTION
According to the present invention, there are provided a process for continuously casting a bar having a helical groove which comprises casting a bar in a mold for continuous casting which has a helical inner wall surface or has a groove or protrusion helically cut on its inner wall surface while rotating and drawing the bar in conformity with the slope of the helix; a mold for continuous casting having a monolithic structure or combined structure, which has a molten metal-supplying - part and a heating unit attached to the inside or outside of the mold and in which the inner wall surface on the side of the molten metal-supplying part or the whole of the mold is heated above the solidification temperature of a metal to be cast with the heating unit and the side of the mold for taking off a continuously cast bar is cooled below the solidification temperature;
a continuous casting process using the above mold, and an apparatus for the continuous casting.
~ ~rrl~
Fig. 1 is a sectional side view of a casting apparatus with combined heating and cooling units in a situation at the beginning of a continuous casting.
Fig. 2 is a sectional side view of a casting apparatus in casting operation and a sketch drawing of a continuously cast bar formed.
PREFERRED EMBGDIMENTS OF THE INVENTION
The present invention will be described in detail below.
Although the present invention can be applied to all kinds of metals and their alloys, a body to be cast immediately after solidification is required to bear a shearing force caused by the rotation of the mold or the rotation of the cast body itself, 90 that the invention is more suitably applied to pure metals or systems containing a small amount of an alloy.
A helical cast bar can be obtained by drawing a body to be cast while rotating it in conformity with the slope of the helix. When a longer bar is to be cast, the cast body may be taken up around a jig such as a spool or bobbin while being rotated together with the jig. A cast bar having a helical groove can be also obtained continuously by drawing the cast bar while rotating the mold in conformity with the slop of the helix, instead of rotating the cast bar itself.
1 In the present invention, a cast bar may be rotated by, for example, rotating the moldr rotating a jig for taking up the cast bar or rotating a molten metal-holding part for supplying molten metal and the 5 mold part as one body as well as rotating the cast bar itself.
When a long bar having a helical groove is of a small diameter or when the pitch of the helix is minute, the mold for continuous casting is desirably the 10 one which can ~chieve unidirectional solidification in the opposite direction to the casting direction and besides in which the shape of freezing interface is pre-ferably such that solidification on the surface of t:he cast bar is delayed behind solidification at the center 15 portion thereof-For this purpose, it is effective that themold is constructed of a cooling part to be cooled at temperatures lower than the freezing temperature of the metal to be cast and a heating part to be heated at temperatures higher than the freezing temperature. It is also effective for the purpose of increasing a temperature difference between the cooing and heating parts to highten cooling effect by, for example, pouring water directly onto the cast bar.
The larger the temperature difference between the heating and cooling parts, the more the unidirec-tional solidification is ensured. To attain this object, it is necessary to provide a insulating layer h l.~ 7 ~
1 between the two parts.
The heating part can be maintained above the freezing temperature of the molten metal by heat transferred from the molten metal-holding part, which, however, is not always satisfactory for achieving complete unidirectional solidification even when a heat insulating layer is provided between the heating part and the cooling part. Therefore, the heating unit is preferably provided in the inside or outside of the mold. Examples of heating units usable for such purpose include one which makes use of resistance heating and one which uses an induction heating.
By conducting the continuous casting with a mold having a heating part~ insulating part and cooling lS part as mentioned above while conducting the rotation in conformity with the slope of helix, a continuously cast bar having a helical groove can be easily produced through a simple process step~
Although the shape of the cross-section of the mold is basically a circle in the present invention, it is not critical and may be also any one of polygons such as triangles, etc. For example, when the cross-section of the mold is rectangular and the inner wall surface of the mold is helical, bars having helical appearance can be obtained. When the cross-section is circular, continuously cast bars having a helical groove can be obtained by use of a mold having a groove or protrusion hPlically cut on its inner wall surface.
~ t~ 3 1 The shape of the helical groove of the continuously cast bar obtainable in the present invention may be any desired one as long as it permits drawing of the cast bar.
Example Fig. 1 shows an example of a casting apparatus for embodying the process of the present invention in a situation at the beginning of casting. A molten metal-holding furnace 1 is provided with a heating unit 2 and a molten metal-holding crucible 3, and molten aluminum 4 is held therein. To the side wall of the molten-met:al holding crucible is attached a combined mold provided with a graphite-made heating part 5 having a built-in mold heater 8, a copper-made mold-cooling part 6 whose inside is cooled by water and an asbestos cloth insulat-ing part 7 of 1 mm thickness which prevents heat trans-fer between part 5 and part 6.
Although the mold is attached sideways in the present invention, subsequent operations can be con-ducted in completely the ~ame manner as above also whena similar mold is attached to the bottom part of the crucible right downward. The mold has an inner diameter of 30 mm, on the inner wall of which is cut one line of helical protrusion 10 having a triangular cross-section of 5 mm height and 10 mm base length in a pitch of 60 mm.
2~ $1 1 In starting the casting, the mold needs to be plug~ed w~th ~ dummy block ~ so that mo'ten aluminum may not leak out of the mold. Molten aluminum with which the mold is filled freezes at the cooling 5 part and bonds itself firmly to the dummy block.
Although the solidification proceeds as far as the heat insulating part, it does not proceed farther because the heating part has been kept at a temperature higher by several degrees centigrade than the free~ing temperature 10 of aluminum by means of a temperature controlling apparatus. Owing to cooling due to heat transfer from the reezed part, the free~ing interface assumes a ~3hape somewhat convex toward the direction of progress of the solidification.
After the solidification was confirmed in the cooling part, the continuous casting was carried out at a drawing rate of 50 mm/min while rotating the dummy block and the continuously cast bar in conformity with the helical shape of the inside wall surface of the 20 mold.
Fig. 2 shows the appearances of a pair of rolls 11 for rotation and rotational drawing and a continuously cast bar formed 12 having a helical groove on its outer wall.
The continuously cast bar thus obtained had a appearance of smooth, completely reproduced helix and had no defects such as shrinkage cavity inside the bar.
Although the solidification proceeds as far as the heat insulating part, it does not proceed farther because the heating part has been kept at a temperature higher by several degrees centigrade than the free~ing temperature 10 of aluminum by means of a temperature controlling apparatus. Owing to cooling due to heat transfer from the reezed part, the free~ing interface assumes a ~3hape somewhat convex toward the direction of progress of the solidification.
After the solidification was confirmed in the cooling part, the continuous casting was carried out at a drawing rate of 50 mm/min while rotating the dummy block and the continuously cast bar in conformity with the helical shape of the inside wall surface of the 20 mold.
Fig. 2 shows the appearances of a pair of rolls 11 for rotation and rotational drawing and a continuously cast bar formed 12 having a helical groove on its outer wall.
The continuously cast bar thus obtained had a appearance of smooth, completely reproduced helix and had no defects such as shrinkage cavity inside the bar.
Claims (4)
1. A mold for continuous casting which has a helical inner wall surface or has a groove or protrusion helically cut on the inner wall surface thereof.
2. A process for continuously casting a bar having a helical groove which comprises casting a bar in a mold according to Claim 1 while rotating and drawing the bar in conformity with the slope of the helix.
3. A mold for continuous casting having a mono-lithic structure or combined structure, which has a molten metal-supplying part and a heating unit attached to the inside or outside of the mold and in which the inner wall surface on the side of the molten metal-supplying part or the which of the mold is heated above the solidification temperature of a metal to be cast with said heating unit and the side of the mold for taking off a continuously cast bar is cooled below said solidification temperature.
4. A continuous casting process comprising using a mold according to Claim 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02-406938 | 1990-12-26 | ||
| JP2406938A JP3021675B2 (en) | 1990-12-26 | 1990-12-26 | Method and apparatus for manufacturing continuous cast rod having helical shape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2057166A1 true CA2057166A1 (en) | 1992-06-27 |
Family
ID=18516559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2057166 Abandoned CA2057166A1 (en) | 1990-12-26 | 1991-12-06 | Process for producing continuously cast bar having helical contour and apparatus therefor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3021675B2 (en) |
| CA (1) | CA2057166A1 (en) |
| DE (1) | DE4141872A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT508822B1 (en) * | 2009-09-29 | 2013-11-15 | Siemens Vai Metals Tech Gmbh | COZIL FOR THE FORMING OF METALLIC MELT TO A METAL STRIP WITH CIRCULAR OR POLYGONAL CROSS SECTION IN A CONTINUOUS CASTING MACHINE |
-
1990
- 1990-12-26 JP JP2406938A patent/JP3021675B2/en not_active Expired - Lifetime
-
1991
- 1991-12-06 CA CA 2057166 patent/CA2057166A1/en not_active Abandoned
- 1991-12-18 DE DE19914141872 patent/DE4141872A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JP3021675B2 (en) | 2000-03-15 |
| JPH04224047A (en) | 1992-08-13 |
| DE4141872A1 (en) | 1992-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |