CN101733372B - Graphite annulus for continuous lubricating crystallizer and manufacturing method thereof - Google Patents
Graphite annulus for continuous lubricating crystallizer and manufacturing method thereof Download PDFInfo
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- CN101733372B CN101733372B CN2008102447175A CN200810244717A CN101733372B CN 101733372 B CN101733372 B CN 101733372B CN 2008102447175 A CN2008102447175 A CN 2008102447175A CN 200810244717 A CN200810244717 A CN 200810244717A CN 101733372 B CN101733372 B CN 101733372B
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Abstract
The invention provides a graphite annulus for a continuous lubricating crystallizer and a manufacturing method thereof, wherein the graphite annulus comprises the components of graphite powder and asphalt powder. The preparation method of the graphite annulus comprises the following steps of: uniformly mixing the graphite powder and the asphalt powder by the mass percent of 1:1 to 10:1 and then pressing into a blank; placing the blank in an isostatic-pressure sintering furnace for sintering and charging argon, wherein the pressure of the argon is 200 to 1000 MPa, the sintering temperature is 800 to 3000 DEG C, and the temperature and pressure keeping time is 10 to 60 h; cooling the blank with the furnace after sintering and then machining to a finished piece. Because the graphite powder and the asphalt powder are sintered and prepared into the blank in isostatic pressure at high temperature and then are machined to the finished piece, the graphite annulus has the advantages of isotropy, stable chemical and physical properties, high heat conductivity, good size stability and high permeability and is suitable for aluminum and aluminum alloy semi-continuous casting crystallizers.
Description
Technical field
The present invention relates to a kind of graphite annulus for continuous lubricating crystallizer and manufacture method thereof, be applied to aluminium and aluminum alloy semi-continuous casting crystallizer.
Background technology
At present, aluminium and aluminum alloy semi-continuous casting crystallizer generally adopt graphite cannula self-lubricating and these two kinds of lubricating systems of coating lubricating oil, though in casting process, can reduce the friction between aluminium alloy melt and the crystallizer, can play certain lubricant effect, but the graphite self-lubricating effect is relatively poor, be difficult to satisfy the lubricating requirement of casting process, cause ingot casting surface to hang aluminium, draw trace, cold shut, serious problems such as rough surface, segregation bed thickness, tissue odds are even; Fail the real good continuous lubrication function that realizes, still do not have effective measures for reducing once to cool off simultaneously.
Summary of the invention
The objective of the invention is provides a kind of graphite annulus for continuous lubricating crystallizer and manufacture method thereof in order to solve the above-mentioned problems in the prior art satisfactorily.
Purpose of the present invention is achieved through the following technical solutions:
Graphite annulus for continuous lubricating crystallizer, characteristics are: the component of graphite annulus comprises powdered graphite and asphalt powder, the mass percent of powdered graphite and asphalt powder is 1: 1～10: 1.
Further, above-mentioned graphite annulus for continuous lubricating crystallizer, the physical and chemical index of graphite annulus: particle mean size 12～18 μ m, density 1.6～1.8g/cm
2, porosity 12～18Vol.%, average pore size 1～3 μ m, permeability 0.05～0.3cm
2/ s, Rockwell hardness 70～90, resistance 10～14 μ Ω m, bending strength 40～50N/mm
2, compression strength 80～95N/mm
2, Young's modulus 9.5 * 10
3～11.5 * 10
3N/mm
2, thermal expansion 2.5 * 10
-6～3.5 * 10
-6N/mm
2, thermal conductivity factor 80～95Wm
-1K
-1, ash 180～235ppm.
Again further, the manufacture method of graphite annulus for continuous lubricating crystallizer, characteristics are: earlier powdered graphite and asphalt powder are mixed by 1: 1～10: 1 mass percents, be pressed into blank; Blank is put into the isostatic sintering kiln roasting again, charged into argon gas, argon pressure is at 200～1000MPa, and sintering temperature is at 800～3000 ℃, and heat-insulation pressure keeping 10～60h cools off with stove after the roasting, then the machined member.
The outstanding substantive distinguishing features and the obvious improvement of technical solution of the present invention is mainly reflected in:
1. graphite annulus of the present invention adopts powdered graphite and asphalt powder, waits the static pressure high temperature sintering to prepare blank, and the machined member has the isotropism advantage, graphite annulus chemistry and stable physical property, and the thermal conductivity height, dimensional stability is good, the permeability height; Graphite annulus voidage and mechanical property guarantee that fully air and lubricating oil pressurization back sees through graphite annulus in corresponding recesses, form the even oil gas film of one deck at the graphite annulus inwall;
2. graphite annulus of the present invention is in casting process, and the oil gas film has good heat insulation and continuous lubrication, and its pyroconductivity reduces once cooling much smaller than crystallizer, and the ingot casting surface segregation layer significantly reduces, and the interior tissue quality significantly improves; Oil gas film lubrication effect has effectively been eliminated extension aluminium, has been drawn problems such as trace much larger than crystallizer, has significantly improved ingot surface quality and casting speed.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: billet crystallizer graphite annulus vertical view;
Fig. 2: crystallizer graphite annulus cutaway view;
Fig. 3: crystallizer graphite annulus broken section enlarged drawing;
The implication of each Reference numeral sees the following form among the figure:
| Reference numeral | Implication | Reference numeral | Implication | | Implication | |
| 1 | The |
2 | |
3 | The inwall upper edge | |
| Reference numeral | Implication | Reference numeral | Implication | | Implication | |
| 4 | The outer wall |
5 | Outer wall top |
6 | |
|
| 7 | Lubricating |
8 | Outer wall lower |
9 | The outer wall lower edge |
The specific embodiment
The invention provides a kind of graphite annulus for continuous lubricating crystallizer and manufacture method thereof, the component of graphite annulus comprises powdered graphite and asphalt powder, during preparation, powdered graphite and asphalt powder is mixed by 1: 1～10: 1 mass percents, be pressed into briquet, briquet is put into the isostatic sintering kiln roasting again, charged into argon gas, argon pressure is at 200～1000MPa, temperature is at 800～3000 ℃, heat-insulation pressure keeping 10～60h is with stove cooling, machined member.Graphite annulus physical and chemical index: particle mean size 12～18 μ m, density 1.6～1.8g/cm
2, porosity 12～18Vol.%, average pore size 1～3 μ m, permeability 0.05～0.3cm
2/ s, Rockwell hardness 70～90, resistance 10～14 μ Ω m, bending strength 40～50N/mm
2, compression strength 80～95N/mm
2, Young's modulus 9.5 * 10
3～11.5 * 10
3N/mm
2, thermal expansion 2.5 * 10
-6～3.5 * 10
-6N/mm
2, thermal conductivity factor 80～95Wm
-1K
-1, ash 180～235ppm.
Shown in Fig. 1～3: graphite annulus is structure in the form of a ring, and the inwall of graphite annulus is provided with ramp type step 1, and outer wall is provided with air grooves 6 and lubricating oil groove 7, and fluid sealant face 5 and fluid sealant face 8, inwall upper edge rounding 3, outer wall upper edge rounding 4, outer wall lower edge rounding 9.Graphite annulus design ramp type step 1 also is 3～10 ° inclination angle, guarantees to seal between transition rings and the graphite annulus.Graphite annulus adopts powdered graphite and asphalt powder to be equipped with blank with the isostatic cool pressing legal system, through high-temperature roasting, and machined member then; Graphite annulus powdered graphite and asphalt powder are raw material, and the graphite thermal coefficient of expansion is little, guarantee that graphite annulus keeps the workpiece size precision down at high temperature (650～750 ℃); Guaranteed that also material has good intensity and anti-wear performance, and had certain voidage, realized the graphite annulus saturating oily purpose of breathing freely, satisfied the requirement in service life.Graphite annulus outer wall and crystallizer inwall are interference fit, guarantee to seal between graphite annulus and the crystallizer, prevent the leakage of oil of leaking gas; And graphite annulus outer wall 5 and 8 is smeared high-temperature seal adhesive, guarantees fully sealing, prevents that oil gas from exosmosing.Graphite annulus outer wall design air groove 6 and lubricating oil groove 7, its quantity are 2～5, and the wall thickness at groove position is thinner relatively, help air and lubricating oil sees through.Graphite annulus edge rounding 3,4 and 9 is convenient to the graphite annulus dismounting.
In concrete the application: transition rings 2 compresses ramp type step 1, and transition rings 2 and graphite annulus are closely cooperated, and effectively prevents to bore phenomenons such as aluminium, extension aluminium; Graphite annulus edge rounding 3,4 and 9 has effectively prevented the scuffing of graphite annulus in the disassembly process; Graphite annulus outer wall section 5 and 8 and the crystallizer interference fit adopts hot-mounting process to install, and smears high-temperature seal adhesive, has effectively stopped air lubrication oil and has exosmosed; Belt air grooves 6 of graphite annulus outer wall and lubricating oil groove 7 communicate with crystallizer respective air passage and grease channel, and air and lubricating oil are not mixing in the groove separately; Air and lubricating oil are depressed through graphite annulus adding, and form the even oil gas film of one deck at the graphite annulus inwall, play good heat insulation and lubrication, good heat-blocking action has reduced ingot casting surface segregation layer thickness, eliminate cold shut, restrain the inner column crystals growth of ingot casting, refinement ingot casting crystal grain; Good lubrication has been restrained extension aluminium, has been drawn trace, has improved ingot surface quality, has improved casting speed.
Graphite annulus of the present invention adopts powdered graphite and asphalt powder, waits the static pressure high temperature sintering to prepare blank, and the machined member has the isotropism advantage, graphite annulus chemistry and stable physical property, and the thermal conductivity height, dimensional stability is good, the permeability height; Graphite annulus voidage and mechanical property guarantee that fully air and lubricating oil pressurization back sees through graphite annulus in corresponding recesses, form the even oil gas film of one deck at the graphite annulus inwall; The oil gas film has good heat insulation and continuous lubrication, and its pyroconductivity reduces once cooling much smaller than crystallizer, and the ingot casting surface segregation layer significantly reduces, and the interior tissue quality significantly improves; Oil gas film lubrication effect has effectively been eliminated extension aluminium, has been drawn problems such as trace much larger than crystallizer, is widely used in aluminium and aluminum alloy semi-continuous casting crystallizer.
Certainly, more than only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the rights protection scope of the present invention.
Claims (2)
1. graphite annulus for continuous lubricating crystallizer, it is characterized in that: the component of graphite annulus comprises powdered graphite and asphalt powder, the mass percent of powdered graphite and asphalt powder is 1: 1～10: 1; Particle mean size 12～18 μ m of described graphite annulus, density 1.6～1.8g/cm
2, porosity 12～18Vol.%, average pore size 1～3 μ m, permeability 0.05～0.3cm
2/ s, Rockwell hardness 70～90, resistance 10～14 μ Ω m, bending strength 40～50N/mm
2, compression strength 80～95N/mm
2, Young's modulus 9.5 * 10
3～11.5 * 10
3N/mm
2, thermal expansion 2.5 * 10
-6～3.5 * 10
-6N/mm
2, thermal conductivity factor 80～95Wm
-1K
-1, ash 180～235ppm.
2. the manufacture method of the described graphite annulus for continuous lubricating crystallizer of claim 1 is characterized in that: earlier powdered graphite and asphalt powder are mixed by 1: 1～10: 1 mass percents, be pressed into blank; Blank is put into the isostatic sintering kiln roasting again, charged into argon gas, argon pressure is at 200～1000MPa, and sintering temperature is at 800～3000 ℃, and heat-insulation pressure keeping 10～60h cools off with stove after the roasting, then the machined member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102447175A CN101733372B (en) | 2008-11-26 | 2008-11-26 | Graphite annulus for continuous lubricating crystallizer and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102447175A CN101733372B (en) | 2008-11-26 | 2008-11-26 | Graphite annulus for continuous lubricating crystallizer and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101733372A CN101733372A (en) | 2010-06-16 |
| CN101733372B true CN101733372B (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102447175A Active CN101733372B (en) | 2008-11-26 | 2008-11-26 | Graphite annulus for continuous lubricating crystallizer and manufacturing method thereof |
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| CN (1) | CN101733372B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108529612B (en) * | 2017-12-19 | 2019-10-25 | 大同新成新材料股份有限公司 | A kind of isostatic pressing formed graphite product and its production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077483A (en) * | 1993-05-11 | 1993-10-20 | 哈尔滨铁路局哈尔滨科学技术研究所 | Solid lubricant for locomotive wheel rim |
| CN1903482A (en) * | 2006-08-01 | 2007-01-31 | 苏州有色金属加工研究院 | Graphite ring for continuous lubrication crystallizer |
-
2008
- 2008-11-26 CN CN2008102447175A patent/CN101733372B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077483A (en) * | 1993-05-11 | 1993-10-20 | 哈尔滨铁路局哈尔滨科学技术研究所 | Solid lubricant for locomotive wheel rim |
| CN1903482A (en) * | 2006-08-01 | 2007-01-31 | 苏州有色金属加工研究院 | Graphite ring for continuous lubrication crystallizer |
Non-Patent Citations (1)
| Title |
|---|
| 徐立诚.机械密封用碳石墨静环的选择及应用.<<炭素>>.1985,(第1期),第41-50页. * |
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|---|---|
| CN101733372A (en) | 2010-06-16 |
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Effective date of registration: 20171127 Address after: 102209 Changping District City, Beiqijia, the future of science and technology in the south area of the town of Beijing Patentee after: China Aluminum Material Applied Research Institute Co Ltd Address before: Suzhou City, Jiangsu province 215021 Industrial Park No. 200 Shen Hu Road Patentee before: Suzhou Non-ferrous Metal academy Co., Ltd. |
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