CN109773148B - Installation method of interference fit short mandrel continuous casting roll - Google Patents
Installation method of interference fit short mandrel continuous casting roll Download PDFInfo
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- CN109773148B CN109773148B CN201910147615.XA CN201910147615A CN109773148B CN 109773148 B CN109773148 B CN 109773148B CN 201910147615 A CN201910147615 A CN 201910147615A CN 109773148 B CN109773148 B CN 109773148B
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Abstract
The invention provides a method for mounting a short mandrel continuous casting roller in interference fit, wherein the mounting between a roller sleeve and a mandrel of the short mandrel continuous casting roller is in interference fit, so that the invention realizes the mounting by utilizing the principle of thermal expansion and cold contraction of materials, namely the roller sleeve is mounted with the mandrel at normal temperature after being heated to set temperature, or the roller sleeve is mounted with the cooled mandrel after being heated to set temperature, thereby realizing the requirement of the interference fit of the short mandrel continuous casting roller; the invention is suitable for the installation of the short mandrel continuous casting roll.
Description
Technical Field
The invention relates to continuous casting roll processing, in particular to an installation method of an interference fit short mandrel continuous casting roll.
Background
The continuous casting roll is a key component of a bending section, an arc section, a straightening section and a horizontal section on a continuous casting machine, supports the feeding and the pulling of a dummy bar, plays a role in supporting, extruding and straightening in the pulling process of a billet, the service life of the continuous casting machine depends on the service life of the continuous casting roll, and the assembling method of the continuous casting roll is a key factor influencing the service life of the continuous casting roll.
Usually, the fit between the roll sleeve and the mandrel of the long mandrel type continuous casting roll is clearance fit, and the roll sleeve and the mandrel are connected by a key, namely, the middle roll sleeve, the bearing seats and the bearings on two sides of the middle roll sleeve and the like are firstly installed at normal temperature, and then the roll sleeves on two sides, the bearing seats and the bearings on the end parts and the like are installed.
The long-mandrel continuous casting roll is structurally shown in figure 1, and consists of a first roll sleeve 1, a second roll sleeve 2, a third roll sleeve 3, a long mandrel 10, a key 11 and the like. When the long mandrel is installed, the key 5 at the second roller sleeve 2 is installed on the long mandrel 10, then the second roller sleeve 2 is installed in the long mandrel 10, and then the bearings, the bearing seats and other components on the two sides of the second roller sleeve 2 are installed; then, keys 11 at the positions of the first roller sleeve 1 and the third roller sleeve 3 on two sides can be respectively installed, and then the first roller sleeve 1 and the third roller sleeve 3 are respectively installed into the long core shaft 10; and finally, installing accessories such as a bearing and a bearing seat at the end part. The installation method can only be used for installing the long mandrel and is not beneficial to the installation of the short mandrel continuous casting roll; and the method is only suitable for the continuous casting roller with clearance fit and is not beneficial to interference fit.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the method for mounting the interference-assembled short mandrel continuous casting roller, which is suitable for mounting the short mandrel continuous casting roller and can meet the requirement of interference fit of the short mandrel continuous casting roller.
The invention is realized by the following technical scheme:
a method for installing a short mandrel continuous casting roller in interference fit is characterized in that a heating roller sleeve or a heating roller sleeve and a cooling mandrel are adopted for interference fit.
Preferably, the interference assembly is performed by a method of heating the roller sleeve, and the method specifically comprises the following steps:
step 1, heating a first roller sleeve and a third roller sleeve to 320-350 ℃, loading a second end of a first mandrel into a first end of the first roller sleeve, and loading a first end of a fourth mandrel into a second end of the third roller sleeve; loading the first end of the second mandrel into the second end of the first roll shell and loading the second end of the third mandrel into the first end of the third roll shell;
and 3, completing the assembly of the first group of bearing assemblies on the first end of the first mandrel and the fourth group of bearing assemblies on the second end of the fourth mandrel.
Further, in step 2, after the first roller sleeve and the third roller sleeve are cooled, rechecking and correcting are carried out, so that the roller sleeve and the mandrel are coaxial.
Further, step 1 specifically comprises: heating a first roller sleeve and a third roller sleeve to 320-350 ℃, vertically fixing the first roller sleeve and the third roller sleeve on a preheated tool respectively, arranging a first end of the first roller sleeve and a second end of the third roller sleeve at the upper ends, arranging a second end of a first mandrel into the first end of the first roller sleeve, and arranging a first end of a fourth mandrel into the second end of the third roller sleeve; the first roller sleeve and the third roller sleeve are placed in opposite directions, so that the second end of the first roller sleeve and the first end of the third roller sleeve are positioned at the upper ends, the first end of the second mandrel is arranged in the second end of the first roller sleeve, and the second end of the third mandrel is arranged in the first end of the third roller sleeve.
Further, in the step 2, after the second roller sleeve is sleeved on the second mandrel, annular cold air is introduced to two ends of the second roller sleeve, and the cold air is introduced to the bearing seat lubricating holes in the second group of bearing assemblies; after the third group of bearing assemblies is installed, cool air is supplied to the bearing seat lubrication holes in the third group of bearing assemblies.
Further, when a plurality of sets of short mandrel continuous casting rolls are assembled by taking a single fan-shaped section as a unit, the plurality of sets of short mandrel continuous casting rolls are sequentially subjected to the assembly work of the step 1, then the device work of the step 2 is sequentially performed, and finally the assembly work of the step 3 is sequentially performed.
Preferably, the interference assembly is carried out by adopting a method of heating a roller sleeve and cooling a mandrel, and the method specifically comprises the following steps:
step 1, heating a first roller sleeve, a second roller sleeve and a third roller sleeve to 220-250 ℃ and preserving heat;
and 3, completing the assembly of the first group of bearing assemblies on the first end of the first mandrel and the fourth group of bearing assemblies on the second end of the fourth mandrel.
Further, in step 2, the first roll sleeve is vertically fixed on the tool, the first mandrel is installed into the first roll sleeve, then the first roll sleeve is reversely fixed on the tool, and then subsequent installation is performed.
Further, in the step 2, after the second mandrel is installed, annular cold air is introduced to two ends of the first roller sleeve; after the third mandrel is installed, annular cold air is introduced to the two ends of the second roller sleeve, and cold air is introduced to the lubricating holes of the bearing seats in the second group of bearing assemblies; and after the fourth mandrel is installed, annular cold air is introduced to the two ends of the third roller sleeve, and cold air is introduced to the lubricating hole of the bearing seat in the third group of bearing assembly.
Preferably, the interference magnitude between the roller sleeve and the mandrel is 0.41-0.45 mm.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the assembling method, the installation between the roller sleeve and the mandrel of the short mandrel continuous casting roller is interference assembly, so that the assembling is realized by utilizing the principle of thermal expansion and cold contraction of materials, namely the roller sleeve is assembled with the mandrel at normal temperature after being heated to a set temperature, or the roller sleeve is assembled with the cooled mandrel after being heated to the set temperature, and the requirement of interference fit of the short mandrel continuous casting roller can be met; the invention is suitable for the installation of the short mandrel continuous casting roll.
Furthermore, when the roller sleeve is assembled by adopting a method of only heating the roller sleeve, the temperature of the roller sleeve is high enough, the mandrel does not need to be cooled, interference assembly can be carried out, and compared with a liquid nitrogen cooling mandrel, the roller sleeve is easier for operators to operate, can avoid the use of high-price liquid nitrogen, and is low in cost. Meanwhile, the first roller sleeve and the third roller sleeve are assembled respectively and then are assembled together, so that the coaxiality of the roller sleeves and the mandrel can be rechecked and corrected after the first roller sleeve and the third roller sleeve which are assembled are cooled, the second roller sleeve can be ensured to be assembled and kept in the required coaxiality, the qualified rate of products can be effectively controlled, and the rejection rate is reduced.
Furthermore, the mode of perpendicular dress is all adopted in the assembly of each step, can guarantee with the help of the effect of gravity that the dabber can install and target in place.
Furthermore, after the second roller sleeve is sleeved on the second mandrel, annular cold air is introduced to two ends of the second roller sleeve to introduce cold air to the bearing seat lubricating holes in the second group of bearing assemblies; after the third group of bearing assemblies are installed, cold air is introduced into the lubricating holes of the bearing seats, so that the bearing assemblies can be protected, and adverse effects on the bearing assemblies caused by high temperature can be avoided.
Furthermore, as a certain time is needed for waiting for the first roller sleeve and the third roller sleeve to be cooled, the invention sequentially assembles a plurality of sets of the first roller sleeve and the third roller sleeve and then sequentially assembles the second roller sleeve during production, thereby saving the assembly time, saving the installation time, improving the production efficiency and realizing batch installation.
Furthermore, when the assembly is carried out by adopting the method of heating the roller sleeve and cooling the mandrel, the heating temperature is lower, the heating temperature is easy to ensure, meanwhile, the whole assembly is completed in sequence at one time, and the operation steps are simple.
Drawings
Fig. 1 is a sectional view of a conventional long-mandrel continuous casting roll.
FIG. 2 is a cross-sectional view of a short mandrel continuous casting roll of the present invention.
FIG. 3 is a first assembly sequence of the first method of the present invention.
FIG. 4 is a cross-sectional view of the first method of the present invention after assembly in a second step.
Fig. 5 is an assembly sequence for the second method of the present invention.
In the figure: the roller comprises a first roller sleeve 1, a second roller sleeve 2, a third roller sleeve 3, a first mandrel 4, a second mandrel 5, a third mandrel 6, a fourth mandrel 7, a first water guide sleeve 8, a second water guide sleeve 9, a long mandrel 10 and a key 11.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
The installation between the roll sleeve and the mandrel of the short mandrel continuous casting roll to be installed is interference assembly, the interference magnitude is 0.41-0.45 mm, so the installation of the short mandrel continuous casting roll utilizes the principle of expansion with heat and contraction with cold of materials to realize the assembly, and the assembly in each step adopts a vertical installation mode.
The structure of the short mandrel continuous casting roll is shown in fig. 2, and comprises a first roll sleeve 1, a second roll sleeve 2, a third roll sleeve 3, a first mandrel 4, a second mandrel 5, a third mandrel 6, a fourth mandrel 7, a first water guide sleeve 8, a second water guide sleeve 9, a first bearing assembly set, a second bearing assembly set, a third bearing assembly set and a fourth bearing assembly set.
A first end of the first mandrel 4 is provided with a first bearing assembly, and a second end of the first mandrel 4 is arranged in a first end of the first roller sleeve 1; the first end of a second mandrel 5 is arranged in the second end of the first roller sleeve 1, the middle part of the second mandrel 5 is provided with a second set of bearing components, and the second end of the second mandrel 5 is arranged in the first end of the second roller sleeve 2; the first end of the third mandrel 6 is arranged in the second end of the second roller sleeve 2, the middle part of the third mandrel 6 is provided with a third bearing assembly, the second end of the third mandrel 6 is arranged in the first end of the third roller sleeve 3, the first end of the fourth mandrel 7 is arranged in the second end of the third roller sleeve 3, and the second end of the fourth mandrel 7 is provided with a fourth bearing assembly. A first water guide sleeve 8 is arranged in the second roller sleeve 2 and between the second mandrel 5 and the third mandrel 6, and a second water guide sleeve 9 is arranged in the third roller sleeve 3 and between the third mandrel 6 and the third mandrel 7. The bearing assembly includes a bearing and a bearing seat.
The first method is to heat only the roller sleeve without cooling the mandrel, and the assembly method specifically comprises the following steps:
the first step is as follows: respectively vertically fixing a first roller sleeve 1 and a third roller sleeve 3 which are heated to 320-350 ℃ on a preheated tool, wherein a first end of the first roller sleeve 1 and a second end of the third roller sleeve 3 are both positioned at the upper ends; the second end of the first mandrel 4 is fitted into the first end of the first roll mantle 1, and the first end of the fourth mandrel 7 is fitted into the second end of the third roll mantle 3; and then placed in the opposite direction with the second end of the first sleeve 1 and the first end of the third sleeve 3 at the upper ends, the first end of the second mandrel 5 is loaded into the second end of the first sleeve 1 and the second end of the third mandrel 6 is loaded into the first end of the third sleeve 3, as shown in the assembly of fig. 3.
The second step is that: after the first roller sleeve 1 and the third roller sleeve 3 are cooled, a second group of bearing assemblies are arranged in the middle of the second mandrel 5, the first end of the second roller sleeve 2 which is heated to 320-350 ℃ is sleeved on the second end of the second mandrel 5, cold air starts to be introduced to the bottom of the tool, annular cold air is introduced to the two ends of the second roller sleeve 2, and cold air is introduced to a bearing seat lubricating hole on the second mandrel 5; the second roll shell 2 is loaded with the first water guiding sleeve 8, the pre-assembled third group of bearing assemblies (after loading, the bearing block lubricating holes are ventilated with cold air) are installed, and finally the first end of the third mandrel 6 is loaded into the second end of the second roll shell 2, so that the third roll shell 3 is assembled, as shown in the assembly of fig. 4.
The third step: the assembly of the first set of bearing assemblies on the first end of the first mandrel 4 and the fourth set of bearing assemblies on the second end of the fourth mandrel 7 is completed.
In the first method, because a certain time is needed for waiting for the first roll sleeve 1 and the third roll sleeve 3 which are already assembled to be cooled, if a single fan-shaped section 14 is used for sleeving the continuous casting rolls, the 14 groups of the first roll sleeve 1 and the third roll sleeve 3 can be assembled in batch in the process of waiting for cooling, and then the second roll sleeve 2 is assembled in sequence, so that the assembling time is saved, the efficiency is improved, and the method is suitable for large-batch production. After the first roller sleeve 1 and the third roller sleeve 3 which are assembled are cooled, the coaxiality of the roller sleeves and the mandrel can be rechecked and corrected, and therefore the second roller sleeve 2 can be guaranteed to be assembled and kept within the required coaxiality after the whole roller is assembled, the product yield can be effectively controlled, and the rejection rate is reduced.
The second method is heating the sleeve and cooling the mandrel to achieve a short gap fit, using an installation method that is:
heating the first roller sleeve 1, the second roller sleeve 2 and the third roller sleeve 3 to 220-250 ℃ and preserving heat, vertically assembling according to the sequence from left to right in the figure 2 (bearing seats penetrating on the second mandrel 5 and the third mandrel 6 need to be preassembled), wherein the assembling sequence is shown in figure 5, and the specific sequence is as follows: (1) the first roller sleeve 1 is vertically arranged on a tool, and a first mandrel 4 (the surface of the mandrel is immersed in liquid nitrogen to-70 to-90 ℃) is firstly arranged in the first roller sleeve 1; (2) placing the assembly finished in the step (1) on a tool in the opposite direction, loading a second mandrel 5 (the surface of the mandrel is immersed in liquid nitrogen to-70-90 ℃), and ventilating and cooling the first roller sleeve 1 close to the two ends and the bottom; (3) sequentially loading a pre-assembled bearing seat and a first water guide sleeve 8, and carrying out ventilation cooling on the bearing seat lubricating holes on the second roller sleeve 2 close to two ends and the second mandrel 5 under the heat preservation state of the second roller sleeve 2 and the third mandrel 6 (the surface of the mandrel is soaked in liquid nitrogen to-70-90 ℃); (4) and sequentially loading the third roller sleeve 3, the second water guide sleeve 9 and the fourth mandrel 7 (the surface of the mandrel is immersed in liquid nitrogen to-70 to-90 ℃) in a heat preservation state, ventilating and cooling a bearing seat lubrication hole on the third mandrel 6 and the two ends, close to the third roller sleeve 3, of the third roller sleeve, and finally assembling the bearing seats, the end covers and the like on the two sides.
The invention adopts a vertical assembly mode for assembly, and can ensure that the mandrel can be installed in place under the action of gravity.
Claims (8)
1. A method for installing a short mandrel continuous casting roller in interference fit is characterized in that the method of heating a roller sleeve or heating the roller sleeve and cooling a mandrel is adopted for the interference fit;
the interference assembly is carried out by adopting a method of heating a roller sleeve, and the method specifically comprises the following steps:
step 1, heating a first roller sleeve (1) and a third roller sleeve (3) to 320-350 ℃, installing a second end of a first mandrel (4) into a first end of the first roller sleeve (1), and installing a first end of a fourth mandrel (7) into a second end of the third roller sleeve (3); the first end of a second mandrel (5) is arranged in the second end of the first roller sleeve (1), and the second end of a third mandrel (6) is arranged in the first end of the third roller sleeve (3);
step 2, after the first roller sleeve (1) and the third roller sleeve (3) are cooled, installing a second group of bearing assemblies in the middle of the second mandrel (5), and sleeving the first end of the second roller sleeve (2) which is heated to 320-350 ℃ on the second end of the second mandrel (5); a first water guide sleeve (8) is arranged in the second roller sleeve (2), a preassembled third group of bearing assemblies is installed, and finally the first end of a third mandrel (6) is arranged in the second end of the second roller sleeve (2) to complete the installation of the third roller sleeve (3);
step 3, assembling a first group of bearing assemblies on the first end of the first mandrel (4) and a fourth group of bearing assemblies on the second end of the fourth mandrel (7);
the interference assembly is carried out by adopting a method of heating a roller sleeve and cooling a mandrel, and the method specifically comprises the following steps:
step 1, heating a first roller sleeve (1), a second roller sleeve (2) and a third roller sleeve (3) to 220-250 ℃ and preserving heat;
step 2, immersing the surface of the first mandrel (4) in liquid nitrogen to-70 to-90 ℃, and then installing the second end of the first mandrel (4) into the first end of the first roller sleeve (1); immersing the surface of the second mandrel (5) in liquid nitrogen to-70-90 ℃, and then installing the first end of the second mandrel (5) into the second end of the first roller sleeve (1); a second group of bearing assemblies are arranged in the middle of the second mandrel (5), a first water guide sleeve (8) is arranged at the end part of the second end of the second mandrel (5), and then the first end of the second roller sleeve (2) in a heat preservation state is sleeved on the second end of the second mandrel (5); dipping the surface of the third mandrel (6) to-70-90 ℃ in liquid nitrogen, and then placing the first end of the third mandrel (6) into the second end of the second roller sleeve (2); sleeving a first end of a third roller sleeve (3) in a heat preservation state on a second end of a third mandrel (6), and installing a second water guide sleeve (9) at the end part of the second end of the third mandrel (6); immersing the surface of the fourth mandrel (7) in liquid nitrogen to-70-90 ℃, and then placing the first end of the fourth mandrel (7) into the second end of the third roller sleeve (3);
and 3, finishing the assembly of the first group of bearing assemblies on the first end of the first mandrel (4) and the fourth group of bearing assemblies on the second end of the fourth mandrel (7).
2. The method for mounting the interference fit short mandrel continuous casting roll according to the claim 1, characterized in that in the step 2 of interference fit by heating the roll sleeve, the first roll sleeve (1) and the third roll sleeve (3) are rechecked and corrected after cooling so that the roll sleeve and the mandrel are coaxial.
3. The method for installing the interference fit short mandrel continuous casting roll according to claim 1, wherein the step 1 of performing the interference fit by adopting a method of heating a roll sleeve specifically comprises the following steps: heating a first roller sleeve (1) and a third roller sleeve (3) to 320-350 ℃, vertically fixing the first roller sleeve (1) and the third roller sleeve (3) on a preheated tool respectively, enabling a first end of the first roller sleeve (1) and a second end of the third roller sleeve (3) to be located at the upper ends, installing a second end of a first mandrel (4) into the first end of the first roller sleeve (1), and installing a first end of a fourth mandrel (7) into the second end of the third roller sleeve (3); the first roller sleeve (1) and the third roller sleeve (3) are placed in opposite directions, the second end of the first roller sleeve (1) and the first end of the third roller sleeve (3) are located at the upper ends, the first end of the second mandrel (5) is installed into the second end of the first roller sleeve (1), and the second end of the third mandrel (6) is installed into the first end of the third roller sleeve (3).
4. The method for installing the interference fit short mandrel continuous casting roller according to the claim 1, characterized in that in the step 2 of interference fit by adopting the method of heating the roller sleeve, after the second roller sleeve (2) is sleeved on the second mandrel (5), annular cold air is introduced at the two ends of the second roller sleeve (2) to introduce cold air to the bearing seat lubricating holes in the second group of bearing assemblies; after the third group of bearing assemblies is installed, cool air is supplied to the bearing seat lubrication holes in the third group of bearing assemblies.
5. The method for mounting the interference fit short mandrel continuous casting roll according to claim 1, wherein in the interference fit by adopting the method for heating the roll sleeve, when a plurality of sets of short mandrel continuous casting rolls are assembled by taking a single fan-shaped section as a unit, the plurality of sets of short mandrel continuous casting rolls are sequentially subjected to the assembly work of the step 1, then the device work of the step 2 and finally the assembly work of the step 3.
6. The method for mounting the interference fit short mandrel continuous casting roller according to claim 1, characterized in that in the interference fit step 2, the method of heating the roller sleeve and cooling the mandrel is adopted, the first roller sleeve (1) is vertically fixed on a tool, the first mandrel (4) is installed in the first roller sleeve (1), then the first roller sleeve (1) is reversely fixed on the tool, and then the subsequent mounting is carried out.
7. The method for installing the interference fit short mandrel continuous casting roller according to the claim 1, characterized in that in the interference fit step 2, the method of heating the roller sleeve and cooling the mandrel is adopted, and after the second mandrel (5) is installed, annular cold air is introduced to the two ends of the first roller sleeve (1); after the third mandrel (6) is installed, annular cold air is introduced to the two ends of the second roller sleeve (2), and cold air is introduced to a bearing seat lubricating hole in the second group of bearing assemblies; after the fourth mandrel (7) is installed, annular cold air is introduced to the two ends of the third roller sleeve (3), and cold air is introduced to a bearing seat lubricating hole in the third group of bearing assemblies.
8. The method for mounting the interference fit short mandrel continuous casting roll according to claim 1, wherein the interference magnitude between the roll sleeve and the mandrel is 0.41-0.45 mm.
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| CN201910147615.XA CN109773148B (en) | 2019-02-27 | 2019-02-27 | Installation method of interference fit short mandrel continuous casting roll |
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| CN201910147615.XA CN109773148B (en) | 2019-02-27 | 2019-02-27 | Installation method of interference fit short mandrel continuous casting roll |
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| CN113560512B (en) * | 2021-08-02 | 2022-04-26 | 常州宝菱重工机械有限公司 | Continuous casting roll and method for assembling the same |
| CN115319453B (en) * | 2022-05-30 | 2024-01-09 | 中钢集团西安重机有限公司 | Installation method of free roller of continuous casting machine |
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| CN1443608A (en) * | 2002-03-12 | 2003-09-24 | 中南大学 | Hot-mounted roller sleeve type combined roller |
| AT502694B1 (en) * | 2005-10-20 | 2007-10-15 | Voest Alpine Industrienanlagen | STRAND LEADERSHIP |
| CN101954463A (en) * | 2010-09-17 | 2011-01-26 | 中国重型机械研究院有限公司 | Method for designing guide roller of slab caster |
| CN204685988U (en) * | 2015-05-06 | 2015-10-07 | 中钢集团西安重机有限公司 | A kind of short mandrel continuous casting rollers |
| CN105563105B (en) * | 2015-12-28 | 2017-11-21 | 内蒙古宇亚科技股份有限公司 | Mandrel type Continuous Casting Rolls assemble special press-mounting platform and its assembly method |
| CN105880500B (en) * | 2016-04-27 | 2018-02-02 | 中国重型机械研究院股份公司 | A kind of Novel connection casting machine driven roller |
| CN208214260U (en) * | 2018-04-27 | 2018-12-11 | 上海宝钢工业技术服务有限公司 | Continuous Casting Rolls with internal cooling structure |
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