JP3831583B2 - Cooling drum for continuous casting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling drum of a drum type continuous casting machine for continuously casting a thin metal plate.
[0002]
[Prior art]
FIG. 7 is a perspective view of a general drum type continuous casting machine.
According to this, molten metal (molten metal) 3 is supplied to a hot water pool formed by a pair of cooling drums 1 and 1 and side weirs 2 and 2 that rotate in opposite directions (arrow directions in the figure), and cooled. By bringing the drums 1 and 1 into contact with the surface and cooling, a solidified shell is formed, and a strip slab (metal thin plate) 4 is cast.
[0003]
FIG. 8 is an enlarged cross-sectional view taken along arrows VIII-VIII in FIG. 7 showing the end of the cooling drum and the sliding portion of the side weir at the kissing point where the surfaces of the pair of cooling drums are closest.
The end faces 1a, 1a of the pair of cooling drums 1, 1 slide with the ceramic plate 5 mounted on the side weir 2, and the molten metal 3 is sealed by the edge portions 1b, 1b on the surfaces of the pair of cooling drums 1, 1. Thus, the molten metal 3 is prevented from leaking outside the hot water pool. At this time, the end faces 1a and 1a of the pair of cooling drums 1 and 1 are not displaced relative to each other in the axial direction (drum axial direction), and must be in contact with the ceramic plate 5 on the surface.
[0004]
The conventional internal structure of the cooling drum 1 as described above is shown in FIGS.
In either case, the cooling drum 1 has a structure in which a drum sleeve 10 made of an outer copper alloy is supported by a steel drum body (core member) 11 from the inside in order to increase the rigidity. Hollow shaft portions 11 a are integrally assembled at both end portions of the drum body 11. Moreover, the arrow in FIGS. 9-11 shows the flow of a cooling water.
[0005]
The cooling drum shown in FIG. 9 was proposed by the present applicant in Japanese Utility Model Application No. 61-66897. The drum body 11, the drum sleeve 10 detachably fitted on the outer periphery of the drum body 11, A pair of wedge rings 12A and 12B which are inserted into the joint end portions of 10 and 11 and fix the both 10 and 11, and a presser ring 13 which is fixed to both end surfaces of the drum body 11 and presses one wedge ring 12B. It consists of
[0006]
FIG. 10 also shows a structure in which the drum sleeve 10 is supported by the drum body 11 inside the drum sleeve 10, and the joint ends of the both 10 and 11 are joined by fillet welding 14.
[0007]
FIG. 11 shows a structure in which the drum sleeve 10 is supported by the drum body 11 inside the drum sleeve 10, and the entire contact surfaces of both the members 10 and 11 are joined by shrink fitting 15.
[0008]
[Problems to be solved by the invention]
However, in the case shown in FIG. 9, it is impossible to prevent slip by restraining the axial extension caused by thermal deformation during casting of the drum sleeve 10 only by the frictional force of the wedge rings 12A and 12B. The sleeve 10 extends in the axial direction, and there is no guarantee that the sleeve 10 extends in the axial direction symmetrically with respect to the center of the drum. Therefore, an axial shift occurs between the ends of the pair of cooling drums 1, 1. There was a problem that the molten metal seal was insufficient.
[0009]
Further, in the case shown in FIG. 10, the durability of the fillet weld 14 that restrains the elongation of the drum sleeve 10 is small, and once one of the welds is broken, the drum sleeve 10 is not in the center. There is no problem of extending symmetrically in the axial direction. Therefore, there is a problem that an axial shift occurs between the end portions of the pair of cooling drums 1 and 1, and the molten metal seal with the side weir 2 becomes insufficient.
[0010]
Further, in the case shown in FIG. 11, the entire joint portion of the drum sleeve 10 and the drum body 11 can be tightened, but even if the tightening can be tightened most within the elastic deformation of the drum sleeve 10, The extension force of the drum sleeve 10 is stronger than the frictional force of the joint surface, slips at the fitting surface, and there is no guarantee that the drum sleeve 10 extends in the axial direction symmetrically with respect to the center. There was a problem that axial displacement occurred between the end portions of the cooling drums 1 and 1 and the molten metal seal with the side weir 2 was insufficient.
[0011]
An object of the present invention is that the cooling drum can have a high-strength drum sleeve to improve the fatigue life of the cooling drum and that the drum sleeves of the pair of cooling drums do not shift relative to each other. An object of the present invention is to provide a cooling drum for continuous casting that satisfies the following two requirements.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a cooling drum for continuous casting according to the present invention supplies molten metal to a sump formed by a pair of cooling drums and side weirs rotating in opposite directions, and the surface of the cooling drum A cooling drum of a drum-type continuous casting machine that forms a solidified shell by contacting and cooling to form a thin metal plate, and the cooling drum includes a drum body having shaft portions at both ends, and the drum A drum sleeve fitted on the outer periphery of the body, and the drum body has a pair of shaft members integrally formed with the shaft portion and coupled to the ends of the drum sleeve, and the shafts. It is formed by being divided into a core member that is located between the members and that is shrink-fitted to the inner peripheral surface of the drum sleeve without contacting the shaft member.
[0013]
Further, in the shrink fitting between the drum sleeve and the core member that supports the drum sleeve from the inside, a tightening margin at an intermediate portion in the drum axial direction is made larger than a tightening margin of the end portion.
[0014]
Further, the thickness of the intermediate portion in the drum axial direction of the core member supporting the drum sleeve from the inside is made thicker than the thickness of the end portion.
[0015]
Further, the end of the drum sleeve and the shaft member are fastened by bolts.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the cooling drum for continuous casting which concerns on this invention is demonstrated in detail using drawing based on an Example.
[0017]
[First embodiment]
FIG. 1 is a sectional view of the internal structure of a cooling drum showing a first embodiment of the present invention, and FIG. 2 is an explanatory view of the surface pressure distribution on the fitting surface at the end of the cooling drum.
[0018]
As shown in FIG. 1, the cooling drum 1 includes a drum body 11 having hollow shaft portions 11 a at both ends, and a drum sleeve 10 fitted to the outer periphery of the drum body 11, and the drum body 11. Is a pair of shaft members 11A integrally formed with the hollow shaft portion 11a and joined to the end portions of the drum sleeve 10, and the shaft member 11A is positioned between the shaft members 11A without contacting the shaft member 11A. It is divided into a core member 11B shrink-fitted on the inner peripheral surface of the drum sleeve 10.
[0019]
The drum sleeve 10 is made of a material (for example, a copper alloy) that has been subjected to cold forging and aging treatment after solution treatment and has become high strength, and is joined to the core member 11B by shrink fitting 15. . At this time, a tightening margin (by crowning) of the shrink-fit joint surface at the intermediate portion in the drum axial direction is set to about 1.2 times the tightening margin of the end portion.
[0020]
The joint between the pair of shaft members 11 </ b> A and the drum sleeve 10 is shrink-fit, and the tightening margin is smaller than that in the case of shrink-fit between the core member 11 </ b> B and the drum sleeve 10. The shaft member 11A and the core member 11B use a rigid material (for example, stainless steel).
[0021]
The cooling water flows in from the hollow shaft portion 11a of one shaft member 11A and is discharged from the hollow shaft portion 11a of the other shaft member 11A. In the cooling drum 1, the cooling water follows two cooling water systems.
[0022]
For example, the cooling water flowing from the hollow shaft portion 11a of the one shaft member 11A is guided from the cooling water hole 17a inside the one shaft member 11A to the cooling water hole 18b inside the drum sleeve 10, where the drum After the heat stored in the sleeve 10 is taken away, the heat is discharged from the hollow shaft portion 11a of the other shaft member 11A to the outside of the cooling drum through the cooling water hole 17d and the cooling water jacket 19b inside the other shaft member 11A.
[0023]
The other is led from the cooling water hole 17b inside the other shaft member 11A to the cooling water hole 18a inside the drum sleeve 10, where the heat accumulated in the drum sleeve 10 is taken away and then one shaft member 11A is taken. It passes through the internal cooling water hole 17c and the cooling water jacket 19a, and further passes through the cooling water pipe 20 to the cooling water jacket 19b of the other shaft member 11A, and from here passes through the hollow shaft portion 11a of the other shaft member 11A. And discharged outside the cooling drum.
[0024]
Since these two cooling water systems are alternately arranged in the circumferential direction of the cooling drum 1, the cooling water flowing through the cooling water holes 18 a and 18 b inside the drum sleeve 10 becomes a counter flow.
[0025]
According to the cooling drum 1 of the drum-type continuous casting machine configured as described above, the drum sleeve 10 and the core member 11B are joined by the shrink-fitting 15, so that the drum sleeve 10 and the core member 11B being cast are thermally expanded. The shear stress increases due to the difference, and the joint surface slips. However, in this structure, the core member 11B and the pair of shaft members 11A are separate and non-contact, and the fitting surface length of the shaft member 11A is shortened. A surface pressure distribution p appears, the fitting surface on the inner side (in the drum axis direction intermediate side) of the shaft member 11A slips, and the outer side does not slip. Thereby, the relative displacement in the axial direction of the drum end surface is eliminated with reference to the bearings of the pair of cooling drums 1.
[0026]
Further, since the tightening margin of the joint surface at the intermediate portion in the drum axial direction between the drum sleeve 10 and the core member 11B is about 1.2 times as large as the tightening margin at the end portion, the intermediate portion has a surface pressure resistance higher than that of the end portion. Therefore, both ends of the drum sleeve 10 and the core member 11B slide slightly for each rotation of the drum, and the core member 11B as a whole does not move greatly.
[0027]
[Second Embodiment]
FIG. 3 is a sectional view of the internal structure of the cooling drum showing the second embodiment of the present invention.
[0028]
This is an example in which the thickness of the intermediate portion in the drum axial direction of the core member 11B, which increases the shrinkage allowance for shrink fitting, is made thicker than the end portion to maintain a large surface pressure resistance, and is the same as in the first embodiment. The effect is obtained.
[0029]
[Third embodiment]
FIG. 4 is a sectional view of the end portion of the cooling drum showing a third embodiment of the present invention.
[0030]
This is an example in which the joining of the drum sleeve 10 and the shaft member 11 </ b> A is changed from shrink fitting to fastening with bolts 21. According to this, in addition to the effect similar to 1st Example, since the interference of the fitting surface can be made small, the advantage that attachment / detachment of the shaft member 11A is easy is acquired.
[0031]
[Fourth embodiment]
FIG. 5 is a sectional view of the end portion of the cooling drum showing the fourth embodiment of the present invention.
[0032]
This is an example in which the drum sleeve 10 and the shaft member 11 </ b> A are joined by welding 14. According to this, in addition to the effect similar to 1st Example, the advantage that joining work can be performed easily and rapidly is acquired.
[0033]
[Fifth embodiment]
FIG. 6 is a sectional view of the end structure of the cooling drum showing the fifth embodiment of the present invention.
[0034]
This is an example in which the drum sleeve 10 is supported by a steel ring 23 coupled to the shaft member 11A and the bolt 21. According to this, in addition to the effect similar to 1st Example, the advantage that there is a freedom degree in material selection of the shaft member 11A is acquired.
[0035]
Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
[0036]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the molten metal is supplied to the sump formed by the pair of cooling drums and side weirs rotating in opposite directions, and the surface of the cooling drum is supplied. A cooling drum of a drum-type continuous casting machine in which a solidified shell is formed by contact and cooling to cast a thin metal plate, wherein the cooling drum includes a drum body having shaft portions at both ends, and the drum body A pair of shaft members integrally connected to the end portions of the drum sleeves, and the shaft members. It is formed by being divided into a core member that is positioned between the core member and is shrink-fitted to the inner peripheral surface of the drum sleeve without contacting the shaft member. Prevents axial displacement of the arm end portion, can be avoided leakage melt in advance.
[0037]
According to the invention of claim 2, in the shrink fitting of the drum sleeve and the core member that supports the drum sleeve from the inside, the tightening margin at the intermediate portion in the drum axial direction is made larger than the tightening margin at the end. Since the surface pressure resistance is larger at the intermediate portion than at the end portion, the intermediate portion does not slip, and both end portions slide slightly for each rotation of the drum with respect to the intermediate portion of the drum sleeve and the core member. Thus, a large movement as the whole core member does not occur.
[0038]
According to the invention of claim 3, the thickness of the intermediate portion in the drum axial direction of the core member supporting the drum sleeve from the inside is made thicker than the thickness of the end portion. The same effect as that of the invention of 2 can be obtained.
[0039]
According to a fourth aspect of the present invention, since the end of the drum sleeve and the shaft member are fastened by bolts, the tightening margin of the fitting surface can be reduced, so that the shaft member can be attached and detached. Easy.
[Brief description of the drawings]
FIG. 1 is a sectional view of the internal structure of a cooling drum showing a first embodiment of the present invention.
FIG. 2 is an explanatory view of a surface pressure distribution on the fitting surface of the cooling drum end portion.
FIG. 3 is a sectional view of the internal structure of a cooling drum showing a second embodiment of the present invention.
FIG. 4 is a sectional view of an end structure of a cooling drum showing a third embodiment of the present invention.
FIG. 5 is a sectional view of an end structure of a cooling drum showing a fourth embodiment of the present invention.
FIG. 6 is a sectional view of an end structure of a cooling drum showing a fifth embodiment of the present invention.
FIG. 7 is a perspective view of a general drum type continuous casting machine.
8 is an enlarged cross-sectional view taken along arrows VIII-VIII in FIG. 7, showing an end portion of the cooling drum and a sliding portion of the side weir at a kissing point where the surfaces of the pair of cooling drums are closest to each other.
FIG. 9 is a sectional view of the internal structure of a conventional cooling drum.
FIG. 10 is a sectional view of an end structure of a cooling drum of a different conventional example.
FIG. 11 is a cross-sectional view of an end structure of a cooling drum of a different conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cooling drum 1a End surface 1b End edge part 2 Side dam 3 Molten metal 4 Strip cast piece 5 Ceramic plate 10 Drum sleeve 11 Drum body 11A Shaft member 11B Core member 11a Hollow shaft part 12A Wedge ring 12B Wedge ring 13 Press ring 14 Corner Meat weld 15 Shrink fit 17a-17d Cooling water holes 18a, 18b Cooling water holes 19a, 19b Cooling water jacket 20 Cooling water piping 21 Bolt 22 Welding 23 Steel ring

Claims (4)

Casting a thin metal plate by supplying molten metal to a sump formed by a pair of cooling drums and side weirs rotating in opposite directions, forming a solidified shell by contacting and cooling the surface of the cooling drum A cooling drum of a drum type continuous casting machine,
The cooling drum includes a drum body having shaft portions at both end portions, and a drum sleeve fitted to the outer periphery of the drum body, and the drum body integrally includes the shaft portion. A pair of shaft members respectively coupled to the end portions of the drum sleeve and a core member that is located between the shaft members and that is shrink-fitted to the inner peripheral surface of the drum sleeve without contacting the shaft member. A cooling drum for continuous casting, wherein 2. The continuous casting according to claim 1, wherein, in the shrink fit between the drum sleeve and the core member that supports the drum sleeve, the interference at the intermediate portion in the drum axial direction is made larger than the interference at the end. Cooling drum. 2. The cooling drum for continuous casting according to claim 1, wherein a thickness of an intermediate portion in a drum axial direction of a core member supporting the drum sleeve from the inside is made thicker than a thickness of an end portion. 4. The cooling drum for continuous casting according to claim 1, wherein the end portion of the drum sleeve and the shaft member are fastened by bolts.

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