Claims
- 1. A method for compression forging a cast block drawn from a mold in a continuous caster comprising the steps of:
- providing a means for applying compression forging on said cast block;
- orienting said forging compression means at position where the solid phase ratio at the center of the block is in a range of 0.5:1 to 0.9:1 and the thickness reduction of the cast block due to said compression forging satisfies the following formula:
- .delta./d.gtoreq.0.5
- where
- .delta. is the overall reduction (mm) in thickness of the cast block during forging compression; and
- d is the thickness (mm) of the unsolidified layer in the cast block at the position where forging compression is performed.
- 2. A method as set forth in claim 1, which further comprises the step of exerting a stirring force on said cast block in advance of performing compression forging.
- 3. A method as set forth in claim 1, which further comprises steps of:
- monitoring the thickness of said unsolidified layer in said cast block at a crater end or near a crater end; and
- adjusting the casting speed of said continuous caster so that the solid phase ratio at said forging compression stage is maintained in said range of 0.5:1 to 0.9:1.
- 4. A method as set forth in claim 3, which further comprises the step of exerting a stirring force on said cast block in advance of performing compression forging.
- 5. A method as set forth in claim 2, wherein an electromagnetic stirring force is exerted on said cast block in said stirring step.
- 6. A method as set forth in claim 5, wherein said electromagnetic stirring is performed at a frequency between 0.1 to 20 Hz.
- 7. A method as set forth in claim 5, wherein said electromagnetic stirring is performed with a magnetic flux density in the range of 200 to 1600 gauss.
- 8. A method as set forth in claim 5, wherein said electromagnetic stirring is performed while said solid phase ratio is in a range of 0 to 0.8.
- 9. A method as set forth in claim 5, wherein said electromagnetic stirring is performed while the thickness (dd) (mm) of the unsolidified layer is as follows: ##EQU12##
- 10. A method for compression forging a cast block drawn from a mold in a continuous caster comprising the steps of:
- providing a means for applying compression forging on said cast block;
- orienting said compression forging means at a position where said cast block has a given ratio of unsolidified layer, the thickness (d) (mm) of which is: ##EQU13## where D is the overall thickness (mm) of the cast block before compression, and the ratio of thickness reduction .delta. versus thickness of the unsolidified layer d (mm) is greater than or equal to 1.0.
- 11. A method as set forth in claim 10, which further comprises the step of exerting a stirring force on said cast block in advance of performing compression forging.
- 12. A method as set forth in claim 10, which further comprises the steps of:
- monitoring the thickness of said unsolidified layer in said cast block at a crater end or near a crater end; and
- adjusting the casting speed of said continuous caster so that the solid phase ratio at said compression forging stage is maintained in said range.
- 13. A method as set forth in claim 12, which further comprises the step of exerting a stirring force on said cast block in advance of performing compression forging.
- 14. A method as set forth in claim 11, wherein an electromagnetic stirring force is exerted on said cast block in said stirring step.
- 15. A method as set forth in claim 14, wherein said electromagnetic stirring is performed at a frequency of 0.1 to 20 Hz.
- 16. A method as set forth in claim 15, wherein the magnetic flux density of said electromagnetic stirring is in a range between 200 to 1600 gauss.
- 17. A method as set forth in claim 14, wherein said electromagnetic stirring is performed while said solid phase ratio is in a range of 0:1 to 0.8:1.
- 18. A method as set forth in claim 15, wherein said electromagnetic stirring is performed while the thickness (d) (mm) of the unsolidified layer is: ##EQU14##
- 19. A method as set forth in claim 10, wherein the ratio of compressive reduction .delta. (mm) versus thickness of unsolidified layer d (mm) is greater than or equal to 0.5.
- 20. An apparatus for compression forging a cast block drawn from a casting mold in a continuous caster comprising:
- means for receiving a cast block from said continuous caster and feeding the same to a compression forging means;
- said compression forging means being provided at a position where the solid phase ratio of the block is within a range between 0.5:1 to 0.9:1 and the thickness reduction of the cast block by said compression forging satisfies the following formula:
- .delta./d.gtoreq.0.5
- wherein
- .delta. is the overall reduction (mm) in thickness of the cast block during compression forging; and
- d is the thickness (mm) of the unsolidified layer in the cast block at the position where compression forging is performed.
- 21. An apparatus as set forth in claim 20, which further comprises means provided upstream of said compression forging means for exerting a stirring force on said cast block in advance of performing compression forging.
- 22. An apparatus as set forth in claim 21, wherein said stirring means exerts an electromagnetic stirring force on said cast block in said stirring step.
- 23. An apparatus as set forth in claim 22, wherein said stirring means performs said electromagnetic stirring at a frequency between 0.1 to 20 Hz.
- 24. An apparatus as set forth in claim 22, wherein said electromagnetic stirring is performed with a magnetic flux density in a range between 200 to 1600 gauss.
- 25. An apparatus as set forth in claim 22, wherein said stirring means performs said electromagnetic stirring while said solid phase ratio is in a range of 0:1 to 0.8:1.
- 26. An apparatus as set forth in claim 22, wherein said stirring means performs said electromagnetic stirring while the thickness (d) (mm) of the unsolidified layer is: ##EQU15##
- 27. An apparatus for compression forging a cast block drawn from a mold in a continuous caster comprising:
- means for receiving a cast block from said continuous caster and feeding the same to a compression forging means;
- said compression forging means being provided at a position where said cast block has an unsolidified layer the thickness (d) (mm) of which is: ##EQU16## where D is the overall thickness (mm) of the cast block before compression, and the ratio of thickness reduction (d mm) versus thickness of the unsolidified layer (d mm) is greater than or equal to 1.0.
- 28. An apparatus as set forth in claim 27, which further comprises means provided upstream of said forging compression means for exerting a stirring force on said cast block in advances of performing compression forging.
- 29. An apparatus as set forth in claim 28, wherein said stirring means exerts an electromagnetic stirring force on said cast block in said stirring step.
- 30. An apparatus as set forth in claim 29, wherein said stirring means performs said electromagnetic stirring at a frequency between 0.1 to 20 Hz.
- 31. An apparatus as set forth in claim 29, wherein said electromagnetic stirring is performed with a magnetic flux density in a range between 200 to 1600 gauss.
- 32. An apparatus as set forth in claim 29, wherein said stirring means performs said electromagnetic stirring while said solid phase ratio is in a range between 0 to 0.8.
- 33. An apparatus as set forth in claim 29, wherein said stirring means performs said electromagnetic stirring while the thickness (d) (mm) of unsolidified layer is: ##EQU17##
- 34. An apparatus as set forth in claim 27, wherein said compression forging means performs compression forging of said cast block while the ratio of reduction .delta. (mm) versus thickness of the unsolidified layer (d mm) is greater than or equal to 0.5.
- 35. A method for compression forging a cast block drawn from a mold in a continuous caster comprising the steps of:
- providing means for applying compression forging on said cast block;
- orienting said forging compression means at a position where the solid phase ratio at the center of the block is in a range of 0.5:1 to 0.9:1 and the thickness reduction of the cast block due to said compression forging satisfies the following formula:
- .delta./d.gtoreq.0.5
- where .delta. is the overall reduction (mm) in thickness of the cast block during forging compression; and
- d is the thickness (mm) of the unsolidified layer in the cast block at the position where forging compression is performed,
- exerting a stirring force on said cast block; and
- performing the continuous compression forging subsequently to the step of exerting stirring force.
- 36. An apparatus for compression forging a cast block drawn from a mold in a continuous caster comprising:
- means for applying compression forging on said cast block, said compression means being conducted while orienting said forging compression means at position where the solid phase ratio at the center of the block is in a range of 0.5:1 to 0.9:1 and the thickness reduction of the cast block due to said compression forging satisfies the following formula:
- .delta./d.gtoreq.0.5
- where
- .delta. is the overall reduction (mm) in thickness of the cast block during forging compression;
- and
- d is the thickness (mm) of the unsolidified layer in the cast block at the position where forging compression is performed, and
- means for exerting a stirring force on said cast block in advance of performing said continuous compression forging.
Priority Claims (2)
Number |
Date |
Country |
Kind |
61-206693 |
Sep 1986 |
JPX |
|
62-18721 |
Jan 1987 |
JPX |
|
Parent Case Info
This application is a continuation, of application Ser. No. 071,412, filed 7/9/87, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (6)
Number |
Date |
Country |
532896 |
Nov 1956 |
CAX |
59-159934 |
Sep 1984 |
JPX |
59-202145 |
Nov 1984 |
JPX |
60-148651 |
Aug 1985 |
JPX |
61-189850 |
Aug 1986 |
JPX |
1174849 |
Dec 1969 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
71412 |
Jul 1987 |
|