Casting production, roll gap changes are influenced by many factors, but also because the production environment, it is difficult to directly measured changes fluctuation roll gap. Research shows that the ideal design and production of roll gap, gap compared to the fluctuation of serious directly influence the slab surface quality, drum belly deformation. So the casting process variation rule of roll gap for how to improve casting billet quality, improve the service life of equipment provides a prerequisite basis.
Using finite element technique, based on ANSYS, MARC simulation software, according to a large steel casting, establish the typical fan model based on the framework, adhere to roll casting production, and the fluctuation change between the comparative study, and discussed the steel casting process change law of roll gap.
1 fan-shaped section model
3d model and fan section 1.1 mesh simplification
Located in casting mould fan is below the slab caster key equipment, main functions: 1] is accepted from crystallization has certain thickness of the solidified shell, and slab of slab were forced cooling water or smog, shell thickness increases, the greatest degree of avoid by static pressure caused by steel drum belly "or" leakage accident of steel, Guiding support analyzed.essential chain, prevent deformation and ingot casting chain deviation. When solidified shell were pulled out of the mould, internal steel by static pressure, can produce drum belly phenomenon, so modern slab caster roller diameter by little more densely roll column arrangement. This paper discussed the caster for each sector of driven roller and may include 1 to drive roller. Each driven by motor reducer roller drive, driving roller, which is driven by the cylinder pressure on displacement control and the position control roll. Between four and framework through the hinge of symmetry, and through the pole connected four cylinders driving, realize the relative motion between upper frame, so as to realize the clamping down for fan and loosen.
Fan complex structure, including for casting equipment, so most of the parts when modeling for fan rational structure for saving mesh simplification and computational cost function. Simplified methods are as follows:
1) the general framework for fan (stanza except roller is symmetric structure, using 1/2 symmetric model,
2) and the framework of stiffened plate is simplified as part of planar shell element,
3) the whole displacement deformation, the welding joint bolts and some form of representation of a node connections: fan period between casting roller bearing with frame, thrust copper pieces and fan period between ontology by screws,
4) in removing the pipes and pipe model, screw holes, lifting lugs, small Angle of the structure of structure strength has little effect factors, but also in the framework of the top groove is simplified to the rules - simplified rectangular hole,
5) hinge pole - cylinder structure is complex, involves the machine and hydraulic coupling problem. Due to the actual situation of the structure and compressive deformation produced only, so here and compressive stiffness consistent principle to be simplified into a hinged connection rod structure and framework of the two bar - equivalent pole,
6) model without considering the influence of temperature.
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Continuous casting production, roll gap change affected by many factors, but also because of poor production environment, it is difficult to directly measure the changes in roll gap fluctuations. Studies have shown that the ideal of roll gap and design compared to the production of the excessive volatility of Roll Gap serious direct impact on the General Assembly, billet surface quality, bulge deformation. So study the process of continuous casting roll gap fluctuations in the laws on how to improve the slab quality, increase the service life of continuous casting equipment, provide a basis for the premise.
In this paper, finite element technology, based on ANSYS, MARC large-scale simulation software package, for a steel continuous casting machine, the establishment of a typical fan-shaped segment model as a basis for a framework attached to the whole roll out of continuous casting roll gap before and after the volatility of changes in the comparative study and to explore this steel mill caster roll gap in the production process was studied.
A fan-shaped segment model
1.1 The fan-shaped section of three-dimensional model and mesh simplification
Continuous caster at the bottom of the fan-shaped section is a key component of slab continuous casting machine equipment, the main function 【1】 is to accept a certain billet from the mold shell thickness of slab, and slab mandatory sprinkler or aerosol cooling, so that increasing the thickness of solidified shell, the greatest degree of avoid hydrostatic pressure caused by molten steel "drum belly" or breakout accidents; guide support dummy chain, to prevent the slab deformation and dummy bar chain deviation. When the solidification of billet mold after the shell is pulled out by the internal molten steel static pressure will result in bulge phenomenon, so the modern slab caster to use more small-diameter rollers roll out close-packed arrangement. Discussed in this article continuous casting machine for each fan-shaped section includes five pairs of driven rollers and 1 on the drive roller composition. Each pair of drive roller driven by motor reducer, the drive roller driven by a fuel tank, can be displacement control and pressure control roller position. Between the upper and lower frame through four symmetrical hinge connecting rod, and through four hydraulic cylinders drive, to achieve relative movement between the upper and lower frame to achieve the fan-shaped section of the upper and lower clamping and release.
In this paper, finite element technology, based on ANSYS, MARC large-scale simulation software package, for a steel continuous casting machine, the establishment of a typical fan-shaped segment model as a basis for a framework attached to the whole roll out of continuous casting roll gap before and after the volatility of changes in the comparative study and to explore this steel mill caster roll gap in the production process was studied.
A fan-shaped segment model
1.1 The fan-shaped section of three-dimensional model and mesh simplification
Continuous caster at the bottom of the fan-shaped section is a key component of slab continuous casting machine equipment, the main function 【1】 is to accept a certain billet from the mold shell thickness of slab, and slab mandatory sprinkler or aerosol cooling, so that increasing the thickness of solidified shell, the greatest degree of avoid hydrostatic pressure caused by molten steel "drum belly" or breakout accidents; guide support dummy chain, to prevent the slab deformation and dummy bar chain deviation. When the solidification of billet mold after the shell is pulled out by the internal molten steel static pressure will result in bulge phenomenon, so the modern slab caster to use more small-diameter rollers roll out close-packed arrangement. Discussed in this article continuous casting machine for each fan-shaped section includes five pairs of driven rollers and 1 on the drive roller composition. Each pair of drive roller driven by motor reducer, the drive roller driven by a fuel tank, can be displacement control and pressure control roller position. Between the upper and lower frame through four symmetrical hinge connecting rod, and through four hydraulic cylinders drive, to achieve relative movement between the upper and lower frame to achieve the fan-shaped section of the upper and lower clamping and release.
A fan-shaped segment model
1.1 The fan-shaped section of three-dimensional model and mesh simplification
Continuous caster at the bottom of the fan-shaped section is a key component of slab continuous casting machine equipment, the main function 【1】 is to accept a certain billet from the mold shell thickness of slab, and slab mandatory sprinkler or aerosol cooling, so that increasing the thickness of solidified shell, the greatest degree of avoid hydrostatic pressure caused by molten steel "drum belly" or breakout accidents; guide support dummy chain, to prevent the slab deformation and dummy bar chain deviation. When the solidification of billet mold after the shell is pulled out by the internal molten steel static pressure will result in bulge phenomenon, so the modern slab caster to use more small-diameter rollers roll out close-packed arrangement. Discussed in this article continuous casting machine for each fan-shaped section includes five pairs of driven rollers and 1 on the drive roller composition. Each pair of drive roller driven by motor reducer, the drive roller driven by a fuel tank, can be displacement control and pressure control roller position. Between the upper and lower frame through four symmetrical hinge connecting rod, and through four hydraulic cylinders drive, to achieve relative movement between the upper and lower frame to achieve the fan-shaped section of the upper and lower clamping and release.
Fan-shaped segment complex structure that contains the majority of continuous casting equipment, spare parts, so when the fan-shaped segment structure modeling a reasonable simplification and mesh for the calculation of the cost savings of a significant effect. Simplified method is as follows:
1) The entire frame and large fan-shaped segment (sub-section roller exceptions) symmetrical structure, where a 1 / 2 symmetry model;
2) The upper and lower parts of the framework of the ribs are simplified into a flat shell element;
3) does not affect the overall displacement of deformation of the case with some of the bolts and welding at the junction expressed as nodes connected in the form of: If the fan-shaped frame with the segment between the casting roller bearing, thrust copper block with the fan-shaped section between the body depend on screw fixation;
4) In the model, remove the pipe, water pipes seat, screw holes, hanging ears, a small garden corner structure have little impact on the structural strength of the factors, in addition to the top of the pass on the framework has been simplified - simplified the rules of rectangular holes;
5) The hinge rod - Cylinder complex structure, involving machine - liquid coupling problem. As the actual cases, this structure is only generated tension and compression deformation, so the same here, according to the principle of tension and compression stiffness of the hinge bar-like structure connecting the upper and lower a simplified framework for two-force --- is equivalent to pole;
6) The model does not take into account the impact of temperature field.
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Continuous casting production, roll gap change affected by many factors, but also because of poor production environment, it is difficult to directly measure the changes in roll gap fluctuations. Studies have shown that the ideal of roll gap and design compared to the production of the excessive volatility of Roll Gap serious direct impact on the General Assembly, billet surface quality, bulge deformation. So study the process of continuous casting roll gap fluctuations in the laws on how to improve the slab quality, increase the service life of continuous casting equipment, provide a basis for the premise.
In this paper, finite element technology, based on ANSYS, MARC large-scale simulation software package, for a steel continuous casting machine, the establishment of a typical fan-shaped segment model as a basis for a framework attached to the whole roll out of continuous casting roll gap before and after the volatility of changes in the comparative study and to explore this steel mill caster roll gap in the production process was studied.
A fan-shaped segment model
1.1 The fan-shaped section of three-dimensional model and mesh simplification
Continuous caster at the bottom of the fan-shaped section is a key component of slab continuous casting machine equipment, the main function 【1】 is to accept a certain billet from the mold shell thickness of slab, and slab mandatory sprinkler or aerosol cooling, so that increasing the thickness of solidified shell, the greatest degree of avoid hydrostatic pressure caused by molten steel "drum belly" or breakout accidents; guide support dummy chain, to prevent the slab deformation and dummy bar chain deviation. When the solidification of billet mold after the shell is pulled out by the internal molten steel static pressure will result in bulge phenomenon, so the modern slab caster to use more small-diameter rollers roll out close-packed arrangement. Discussed in this article continuous casting machine for each fan-shaped section includes five pairs of driven rollers and 1 on the drive roller composition. Each pair of drive roller driven by motor reducer, the drive roller driven by a fuel tank, can be displacement control and pressure control roller position. Between the upper and lower frame through four symmetrical hinge connecting rod, and through four hydraulic cylinders drive, to achieve relative movement between the upper and lower frame to achieve the fan-shaped section of the upper and lower clamping and release.
Fan-shaped segment complex structure that contains the majority of continuous casting equipment, spare parts, so when the fan-shaped segment structure modeling a reasonable simplification and mesh for the calculation of the cost savings of a significant effect. Simplified method is as follows:
1) The entire frame and large fan-shaped segment (sub-section roller exceptions) symmetrical structure, where a 1 / 2 symmetry model;
2) The upper and lower parts of the framework of the ribs are simplified into a flat shell element;
3) does not affect the overall displacement of deformation of the case with some of the bolts and welding at the junction expressed as nodes connected in the form of: If the fan-shaped frame with the segment between the casting roller bearing, thrust copper block with the fan-shaped section between the body depend on screw fixation;
4) In the model, remove the pipe, water pipes seat, screw holes, hanging ears, a small garden corner structure have little impact on the structural strength of the factors, in addition to the top of the pass on the framework has been simplified - simplified the rules of rectangular holes;
5) The hinge rod - Cylinder complex structure, involving machine - liquid coupling problem. As the actual cases, this structure is only generated tension and compression deformation, so the same here, according to the principle of tension and compression stiffness of the hinge bar-like structure connecting the upper and lower a simplified framework for two-force --- is equivalent to pole;
6) The model does not take into account the impact of temperature field.
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