CN115321997A - Method for manufacturing furnace roller bearing protection device of roller hearth type heating furnace by adopting mullite powder - Google Patents
Method for manufacturing furnace roller bearing protection device of roller hearth type heating furnace by adopting mullite powder Download PDFInfo
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- CN115321997A CN115321997A CN202211057554.6A CN202211057554A CN115321997A CN 115321997 A CN115321997 A CN 115321997A CN 202211057554 A CN202211057554 A CN 202211057554A CN 115321997 A CN115321997 A CN 115321997A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/522—Oxidic
- C04B2235/5224—Alumina or aluminates
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Abstract
The invention discloses a method for manufacturing a furnace roller bearing protection device of a roller hearth heating furnace by adopting mullite powder, which comprises the following steps: 1) Designing an adaptive grinding tool according to the specific shape of bearings at two ends of the furnace roller, wherein the grinding tool is made into an external square and internal round refractory forming structural member by taking mullite powder and alumina fiber as raw materials and adding a proper amount of adhesive, and a screw mounting hole correspondingly fixed with a metal part of a furnace wall is reserved on the external square structural member; 2) After the outer square and inner round fireproof forming structural member is processed, the outer square and inner round fireproof forming structural member is cut into two parts along the center line, so that the later installation is facilitated; 3) During construction and installation, the metal part of the furnace wall is welded with a threaded anchor; 4) The two fireproof forming structural members are installed at the positions corresponding to the anchor bolts on the furnace wall respectively, and the nuts are screwed in from the mounting holes reserved in the weather-resistant structural members by the lengthened guide rods, so that the installation is firm. The invention can effectively prolong the service life of the furnace roller bearing, reduce the replacement amount, reduce the abrasion of the furnace roller ring and reduce the replacement amount of the roller ring.
Description
Technical Field
The invention relates to a method for manufacturing a furnace roller bearing protection device of a roller hearth type heating furnace by adopting mullite powder.
Background
In the CSP production line, the heating furnace roller is in a high-temperature, intermittent high-speed and heavy-load state in the production process, and the working environment of the equipment is severe. The furnace roller bearings can carry very large loads during slab operation. When the furnace roller bearing is damaged, the furnace roller can be blocked and stop rotating. The roll collar of the furnace roller is blocked and the lower surface of the plate blank generates violent sliding friction, so that the lower surface of the plate blank is scratched and the roll collar is abraded rapidly. During the high-temperature heating process of the heating furnace, the scratched lower surface can generate scale aggregation. The scale removal process before the rolling mill can not be completely removed, so that the defects of oxides, impurities and the like appear on the lower surface of the finished product strip steel. The CSP production line can generate about 1000 tons of defective products every year, the direct economic compensation reaches 5 ten thousand yuan, and the band steel degradation and reexamination cost reaches about 7 ten thousand yuan.
The production line is very huge because of the stove roller quantity that stove roller bearing burns off the production line annually, stove roller bearing average service life is less than 6 months when serious, annual change quantity reaches 400, cause huge economic loss, and simultaneously, because stove roller bearing burns off, can cause stove roller lateral tilt, make the roll collar wearing and tearing aggravation that the atress is big, the centering nature that can direct influence slab play stove takes place for a large scale, bring the influence for stable rolling, can lead to the stove wall card steel accident of hitting in the stove when serious.
Therefore, design a novel fire-resistant shaping structure for strengthen the protection to the stove roller bearing, it is crucial to producing promotion and the stable production of line product quality.
The roller fixing mode of the roller hearth heating furnace designed by the original German company is divided into an inner part and an outer part of a furnace wall, the outer fixed part of the furnace wall is composed of a metal structure, a transmission end is supported by a bracket, a driven end is supported by a small end cover, furnace roller bearings are respectively arranged on the rotating parts of the metal structure members at the two ends, and the service environment of the furnace roller bearings is close to a furnace wall heat insulation layer composed of ceramic fiber modules. The integral integrity and the manual processing level of the ceramic fiber modules at the two ends of the furnace roller directly influence the tightness of the working environment of the bearing. The key control points for preventing the bearing from being burnt are to enhance the tightness and reduce the roasting of high-temperature furnace gas.
At present, two problems directly influence the airtightness of the working environment of the bearing:
1. the stove roller is arranged for running through furnace, for passing through the brickwork insulating layer, needs carry out ceramic fibre module and revolves the hole cutting operation at the brickwork both ends of arranging the stove roller, will cut 4 modules about, about its contact respectively, guarantees that the stove roller can normally be installed and daily maintenance is changed. The existing construction mode is narrow in operation space due to the fact that a large amount of manual construction exists and is carried out inside a hearth, and the standardization and unification of specification and dimension cannot be achieved. The tightness of the working space of the bearing cannot be ensured due to the difference of manual construction.
2. The ceramic fiber module can sink in different degrees along with the extension of service life under the complicated operating mode of furnace, causes the deformation of original furnace roller through hole, and the clearance increase between the furnace roller lower extreme and the ceramic fiber module in the furnace can lead to high temperature furnace gas to flee into, directly burns out the furnace roller bearing.
In conclusion, the standard modular design construction of the refractory materials of the furnace walls at the two ends of the furnace roller is carried out, and the phenomenon that the refractory materials of the furnace walls sink is avoided, so that the main measure for improving the working environment tightness of the furnace roller bearing is provided.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for manufacturing a furnace roller bearing protection device of a roller hearth heating furnace by adopting mullite powder, which effectively prolongs the service life of the furnace roller bearing, reduces the replacement amount, reduces the abrasion of a furnace roller ring and reduces the replacement amount of the roller ring. The phenomenon of deviation of the plate blank in the furnace caused by uneven wear of the roll collar is avoided, the production stability of a production line is improved, and meanwhile, good centering performance can be provided for rolling of a rolling mill.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a method for manufacturing a furnace roller bearing protection device of a roller hearth type heating furnace by adopting mullite powder, which comprises the following steps:
1) According to the specific shape of the bearings at the two ends of the furnace roller, a matched grinding tool is designed, the grinding tool adopts mullite powder and alumina fiber as raw materials and is added with a proper amount of adhesive to prepare an external square and internal round refractory molding structural member, and screw mounting holes which are correspondingly fixed with the metal part of the furnace wall are reserved on the external square structural member.
2) After the outer square and inner round fireproof forming structural member is processed, the outer square and inner round fireproof forming structural member is cut into two parts along the center line, so that the later installation is facilitated;
3) When in construction and installation, the threaded anchor is welded at the metal part of the furnace wall for the installation hole reserved for the external-square internal-round fireproof forming structural member;
4) The two fireproof forming structural members are installed at the positions corresponding to the anchor bolts on the furnace wall respectively, and the nuts are screwed in from the mounting holes reserved in the weather-resistant structural members by the lengthened guide rods, so that the installation is firm.
Furthermore, the grinding tool is made into an outer-square inner-circular refractory forming structural member with the diameter 10-20mm larger than that of the furnace roller bearing.
Furthermore, the grinding tool is made into an outer-side inner-circular refractory forming structural member with the diameter 15mm larger than that of the furnace roller bearing.
Further, the mass ratio of the mullite powder to the alumina fiber to the binder is 125-130:25-30:30-35, the granularity of the mullite powder is more than 1000 meshes, and the mass ratio of the mullite powder to the alumina fiber to the adhesive is preferably 125:27:33.
further, the specific preparation method of the outer square and inner circular refractory molded structural member comprises the following steps:
(5) Putting the raw materials into a stirring container according to the mass ratio;
(6) Fully stirring by using a stirrer, and reducing the generation of bubbles as much as possible in the stirring process;
(7) Injecting the stirred raw materials into a mold, standing for 48 hours at room temperature, and primarily shaping;
(8) Feeding into a furnace, and specifically controlling the temperature as follows: raising the temperature to 60 ℃ by 5 ℃ per hour, preserving the heat for 48 hours, then raising the temperature to 650 ℃ by 30 ℃ per hour, preserving the heat for 3 hours, then raising the temperature to 950 ℃ by 50 ℃ per hour, preserving the heat for 2 hours, and finally raising the temperature to 1250 ℃ by 100 ℃ per hour.
Compared with the prior art, the invention has the following beneficial technical effects:
both mullite and alumina fiber can bear high temperature over 1400 deg.c, and the mullite powder and alumina fiber are used as material and added with proper amount of adhesive. The bearing module for manufacturing the furnace roller inlet and outlet holes can ensure that the total weight of the side wall of the heating furnace is unchanged, and the structural integrity of the heating furnace cannot be influenced. Therefore, the corresponding forming module is manufactured according to the specific shape of the furnace roller bearing, and the implementation performance is good.
The beneficial effects produced are mainly three parts:
1. the burning loss of the furnace roller bearing is reduced.
2. The problem of increase of replacement quantity caused by accelerated wear of the roll collar is reduced, and the consumption of the roll collar is reduced.
3. The generation amount of the surface defects of the strip steel is reduced.
The predicted economic benefit is as follows:
after adopting novel fire-resistant shaping structure, produce economic benefits specifically as follows:
the burning loss of the furnace roller bearing is reduced, the furnace roller bearing is reduced by 400 all the year round, the unit price of spare parts is 1500 yuan, and the total cost of the spare parts is reduced by 400 x 1500=60 ten thousand yuan.
The replacement amount of the furnace roller ring is reduced by 200 every year, the unit price of the roller ring is 1400 yuan/one, and the total cost is reduced by 200 x 1400=28 ten thousand yuan.
The surface quality of the strip steel generated by the furnace roller bearing problem all the year round is directly paid 5 ten thousand yuan for economic benefits, and the degradation and reexamination costs are 7 ten thousand yuan.
By the technical improvement, the total synergistic effect of 60+28+5+7=80 ten thousand yuan in the whole year.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic perspective view of an outer square and inner circular refractory molded structure;
FIG. 2 is a schematic plan view of a square outside and round inside refractory formed structural member;
FIG. 3 is an assembly schematic view of an outer square and inner circular refractory molded structural member;
description of reference numerals: 1-furnace roller bearing; 2-fire-resistant forming structural member with square outside and round inside; 3-screw mounting holes.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
A method for manufacturing a furnace roller bearing protection device of a roller hearth type heating furnace by adopting mullite powder comprises the following steps:
according to the concrete shape of the bearings at two ends of the furnace roller, a corresponding grinding tool is designed, mullite powder and alumina fiber are used as raw materials, and a proper amount of adhesive is added. The diameter of the fire-resistant forming structural member 2 is 15mm larger than that of the furnace roller bearing. And a screw mounting hole 3 which is correspondingly fixed with the metal part of the furnace wall is reserved on the external square structure.
After the fireproof forming part is processed, the fireproof forming part is cut into two parts along the center line, so that later-stage installation is facilitated.
During construction and installation, the screw installation holes 3 reserved corresponding to the fire-resistant forming structural members are welded with threaded anchors at the metal part of the furnace wall.
The two fireproof forming structural members are respectively installed at the positions corresponding to the anchors on the furnace wall, and the nuts are screwed in from the screw installation holes 3 reserved in the weather-resistant structural members by using the lengthened guide rods, so that firm installation is realized.
Wherein: the mass ratio of the mullite powder to the alumina fiber to the adhesive is 125:27:33. the specific preparation method of the outer-square inner-circular refractory forming structural member comprises the following steps:
putting the raw materials into a stirring container according to the mass ratio;
fully stirring by using a stirrer, and paying attention to the stirring process to reduce the generation of bubbles as much as possible;
injecting the stirred raw materials into a mold, standing for 48 hours at room temperature, and preliminarily shaping;
feeding into a furnace, and specifically controlling the temperature as follows: raising the temperature to 60 ℃ by 5 ℃ per hour, preserving the heat for 48 hours, then raising the temperature to 650 ℃ by 30 ℃ per hour, preserving the heat for 3 hours, then raising the temperature to 950 ℃ by 50 ℃ per hour, preserving the heat for 2 hours, and finally raising the temperature to 1250 ℃ by 100 ℃ per hour.
Before the method is used, the number of furnace roller replacement is about 60 per month. After the method is used, about 400 furnace roller bearings are reduced all the year round, about 200 furnace roller collars are replaced, and the generation amount of surface defects of strip steel is reduced.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A method for manufacturing a furnace roller bearing protection device of a roller hearth type heating furnace by adopting mullite powder is characterized by comprising the following steps: the method comprises the following steps:
1) Designing an adaptive grinding tool according to the specific shape of bearings at two ends of the furnace roller, wherein the grinding tool is made into an external square and internal round refractory forming structural member by taking mullite powder and alumina fiber as raw materials and adding a proper amount of adhesive, and a screw mounting hole correspondingly fixed with a metal part of a furnace wall is reserved on the external square structural member;
2) After the outer square and inner round fireproof forming structural member is processed, the outer square and inner round fireproof forming structural member is cut into two parts along the center line, so that the later installation is facilitated;
3) When in construction and installation, the threaded anchor is welded at the metal part of the furnace wall for the installation hole reserved for the external-square internal-round fireproof forming structural member;
4) The two fireproof forming structural members are installed at the positions corresponding to the anchor bolts on the furnace wall respectively, and the nuts are screwed in from the mounting holes reserved in the weather-resistant structural members by the lengthened guide rods, so that the installation is firm.
2. The method for manufacturing the roller bearing protection device of the roller hearth heating furnace by using the mullite powder as claimed in claim 1, wherein the method comprises the following steps: the grinding tool is made into an outer-square inner-circular fireproof forming structural member with the diameter 10-20mm larger than that of the furnace roller bearing.
3. The method for manufacturing the roller bearing protection device of the roller hearth heating furnace by using the mullite powder as claimed in claim 2, wherein the method comprises the following steps: the grinding tool is made into an outer-square inner-circular refractory forming structural member with the diameter 15mm larger than that of the furnace roller bearing.
4. The method for manufacturing the roller bearing protection device of the roller hearth heating furnace by using the mullite powder as claimed in claim 1, wherein the method comprises the following steps: the mass ratio of the mullite powder to the alumina fiber to the adhesive is 125-130:25-30:30-35, and the granularity of the mullite is more than 1000 meshes.
5. The method for manufacturing the roller hearth heating furnace roller bearing protection device by using the mullite powder as claimed in claim 4, wherein the mullite powder is used as a raw material, and the mullite powder is used as a protective material for a roller hearth heating furnace roller bearing: the specific preparation method of the outer-square inner-circular refractory forming structural member comprises the following steps:
(1) Putting the raw materials into a stirring container according to the mass ratio;
(2) Fully stirring by using a stirrer, and paying attention to the stirring process to reduce the generation of bubbles as much as possible;
(3) Injecting the stirred raw materials into a mold, standing for 48 hours at room temperature, and preliminarily shaping;
(4) Feeding into a furnace, and specifically controlling the temperature as follows: raising the temperature to 60 ℃ by 5 ℃ per hour, preserving the heat for 48 hours, then raising the temperature to 650 ℃ by 30 ℃ per hour, preserving the heat for 3 hours, then raising the temperature to 950 ℃ by 50 ℃ per hour, preserving the heat for 2 hours, and finally raising the temperature to 1250 ℃ by 100 ℃ per hour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211057554.6A CN115321997A (en) | 2022-08-30 | 2022-08-30 | Method for manufacturing furnace roller bearing protection device of roller hearth type heating furnace by adopting mullite powder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211057554.6A CN115321997A (en) | 2022-08-30 | 2022-08-30 | Method for manufacturing furnace roller bearing protection device of roller hearth type heating furnace by adopting mullite powder |
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| CN115321997A true CN115321997A (en) | 2022-11-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201983609U (en) * | 2011-01-26 | 2011-09-21 | 中冶京诚工程技术有限公司 | Sealing structure of furnace roller of roller hearth furnace |
| CN203744707U (en) * | 2014-03-03 | 2014-07-30 | 峨眉山市峨冶耐火材料厂 | Furnace roller brick of heating furnace |
| CN104150917A (en) * | 2014-06-12 | 2014-11-19 | 峨眉山市峨冶耐火材料厂 | Furnace roller brick and preparation method thereof |
| CN205002606U (en) * | 2015-07-28 | 2016-01-27 | 新疆八一钢铁股份有限公司 | Cantilever roller footpath brick for heating furnace |
| CN209558884U (en) * | 2018-12-21 | 2019-10-29 | 首钢京唐钢铁联合有限责任公司 | A kind of heat-resisting furnace wall of roller-bottom type tunnel heating furnace |
| CN210638504U (en) * | 2019-05-10 | 2020-05-29 | 江苏宝石耐热科技发展有限公司 | Anti-cracking mullite light brick |
-
2022
- 2022-08-30 CN CN202211057554.6A patent/CN115321997A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201983609U (en) * | 2011-01-26 | 2011-09-21 | 中冶京诚工程技术有限公司 | Sealing structure of furnace roller of roller hearth furnace |
| CN203744707U (en) * | 2014-03-03 | 2014-07-30 | 峨眉山市峨冶耐火材料厂 | Furnace roller brick of heating furnace |
| CN104150917A (en) * | 2014-06-12 | 2014-11-19 | 峨眉山市峨冶耐火材料厂 | Furnace roller brick and preparation method thereof |
| CN205002606U (en) * | 2015-07-28 | 2016-01-27 | 新疆八一钢铁股份有限公司 | Cantilever roller footpath brick for heating furnace |
| CN209558884U (en) * | 2018-12-21 | 2019-10-29 | 首钢京唐钢铁联合有限责任公司 | A kind of heat-resisting furnace wall of roller-bottom type tunnel heating furnace |
| CN210638504U (en) * | 2019-05-10 | 2020-05-29 | 江苏宝石耐热科技发展有限公司 | Anti-cracking mullite light brick |
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