CN216096300U - Novel graphite mold for horizontal continuous casting - Google Patents
Novel graphite mold for horizontal continuous casting Download PDFInfo
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- CN216096300U CN216096300U CN202122822920.XU CN202122822920U CN216096300U CN 216096300 U CN216096300 U CN 216096300U CN 202122822920 U CN202122822920 U CN 202122822920U CN 216096300 U CN216096300 U CN 216096300U
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- Prior art keywords
- graphite
- outer sleeve
- continuous casting
- horizontal continuous
- mold
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 110
- 239000010439 graphite Substances 0.000 title claims abstract description 110
- 238000009749 continuous casting Methods 0.000 title claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 104
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 53
- 239000010949 copper Substances 0.000 claims abstract description 38
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052802 copper Inorganic materials 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 4
- GXDVEXJTVGRLNW-UHFFFAOYSA-N [Cr].[Cu] Chemical compound [Cr].[Cu] GXDVEXJTVGRLNW-UHFFFAOYSA-N 0.000 claims description 4
- 239000000788 chromium alloy Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 abstract description 13
- 238000002425 crystallisation Methods 0.000 abstract description 8
- 230000008025 crystallization Effects 0.000 abstract description 8
- 238000010301 surface-oxidation reaction Methods 0.000 abstract description 3
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 241000227287 Elliottia pyroliflora Species 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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Abstract
The utility model discloses a novel graphite mould for horizontal continuous casting, which comprises a graphite outer sleeve and a graphite core, wherein the graphite core is arranged in the graphite outer sleeve, a copper sleeve is sleeved outside the graphite outer sleeve, a liquid inlet hole is formed in the graphite outer sleeve, and a nitrogen filling hole is formed in the graphite outer sleeve. This novel graphite mold adopts to punch and fills into the mode of appropriate flow nitrogen gas in order to protect the graphite mold of crystallization zone in graphite mold crystallization zone position, slows down graphite mold surface oxidation to reduce the casting blank and pull resistance, improved casting blank surface quality, improved yield and mould life, the cost is reduced and operation personnel intensity of labour.
Description
Technical Field
The utility model relates to the technical field of horizontal continuous casting molds, in particular to a novel graphite mold for horizontal continuous casting.
Background
The existing graphite mould for horizontal continuous casting is mainly used for forming metal melts, and is soaked in high-temperature metal melts for a long time, so that the inner wall of the graphite mould in a crystallization area is oxidized and becomes rough easily, the resistance in the traction process is large, transverse cracks on the surface of a casting blank easily appear, the product quality is seriously influenced, the service life of the mould is reduced, and meanwhile, the cost is increased and the labor intensity of an operator for replacing the mould is increased.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to overcome the existing defects and provide a novel graphite mold for horizontal continuous casting, so as to solve the problems in the background technology. The utility model adopts the following steps.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a horizontal continuous casting is with novel graphite jig, includes graphite overcoat, graphite core, the graphite core sets up in the graphite overcoat, graphite overcoat outside cover is equipped with the copper sheathing, be equipped with the feed liquor hole on the graphite overcoat, be equipped with on the graphite overcoat and fill the nitrogen hole.
Further, the graphite outer sleeve and the graphite core are assembled together through a graphite pin.
Furthermore, four liquid inlet holes are formed along the graphite outer sleeve and are circumferentially arranged.
Furthermore, the nitrogen charging holes comprise inner nitrogen charging holes, outer nitrogen charging holes and nitrogen charging grooves, the inner nitrogen charging holes are radially arranged and eight in number, and the outer nitrogen charging holes are axially arranged and one in number; the inner nitrogen charging hole and the outer nitrogen charging hole are intersected with the nitrogen charging groove.
Further, the graphite core is provided with a taper along the axial direction.
Further, the copper sleeve and the graphite outer sleeve are in interference fit.
Further, the copper sleeve is made of copper-chromium alloy.
The utility model provides a novel graphite mould for horizontal continuous casting, which has the following beneficial effects:
according to the novel graphite mould for horizontal continuous casting, the graphite mould in the crystallization area is protected by punching the position of the crystallization area of the graphite mould and filling nitrogen with proper flow, and the surface oxidation of the graphite mould is slowed down, so that the traction resistance of a casting blank is reduced, the surface quality of the casting blank is improved, the yield is improved, the service life of the mould is prolonged, and the cost and the labor intensity of operators are reduced.
Drawings
Fig. 1 is a schematic sectional view of a novel graphite mold for horizontal continuous casting according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a graphite jacket according to an embodiment of the present invention;
fig. 3 is a schematic longitudinal sectional structure view of a graphite jacket according to an embodiment of the present invention.
In the figure: 1. a graphite jacket; 2. a graphite core; 3. a graphite pin; 4. a transverse liquid inlet hole; 5. a longitudinal liquid inlet hole; 6. filling nitrogen holes inside; 7. a copper sleeve; 8. the outer part is connected with a nitrogen filling hole; 9. and (4) filling nitrogen into the tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Referring to fig. 1-3, the present invention provides a novel graphite mold for horizontal continuous casting, which comprises a graphite outer sleeve 1 and a graphite core 2, wherein the graphite core 2 is arranged in the graphite outer sleeve 1, a copper sleeve 7 is sleeved outside the graphite outer sleeve 1, a liquid inlet hole is arranged on the graphite outer sleeve 1, and a nitrogen filling hole is arranged on the graphite outer sleeve 1. The graphite mold is the heart of the horizontal continuous casting TP2 copper tube billet and is a key part. The graphite mold is used for forming the molten copper into a tubular casting blank.
The graphite mold is processed from high-purity graphite. Graphite is selected as the crystallizer for the horizontal continuous casting of the copper tube blank, because the graphite has the following characteristics:
(1) high temperature resistance: the graphite has a melting point of 3850 ℃ and a boiling point of 4250 ℃, and even if the graphite is burnt by an ultrahigh-temperature electric arc, the weight loss is small and the thermal expansion coefficient is small. The strength of the graphite is enhanced along with the increase of the temperature, and the strength of the graphite is doubled at 2000 ℃;
(2) electric and thermal conductivity: the conductivity of graphite is one hundred times higher than that of common non-metallic ore. The thermal conductivity of the material exceeds that of metal materials such as steel, iron, lead and the like;
(3) lubricity: the lubricating property of the graphite depends on the size of the graphite flake, and the larger the flake is, the smaller the friction coefficient is, and the better the lubricating property is;
(4) chemical stability: the graphite has good chemical stability at normal temperature, and can resist acid, alkali and organic solvent corrosion.
(5) Plasticity: the graphite has good toughness and can be rolled into a thin sheet;
(6) thermal shock resistance: the graphite can withstand the drastic change of temperature without damage when used at normal temperature, and the volume change of the graphite is not large and cracks cannot be generated when the temperature changes suddenly.
Because the solidification and crystallization processes of horizontal continuous casting are carried out in a graphite mold, the graphite mold directly influences the quality and the performance of the TP2 copper tube blank, and the graphite mold consists of a graphite outer sleeve 1 and a graphite core 2. The inner surface of the graphite outer sleeve 1 needs to be smooth and coated, but has no taper; the graphite core 2 has taper, and the surface of the graphite core 2 needs to be smooth and needs to be coated. The graphite sheath 1 and the graphite core 2 are assembled together by means of graphite pins 3.
Four liquid inlet holes are arranged along the graphite jacket 1 and are circumferentially arranged. The size and distribution of the liquid inlet holes have important influence on the solidification of the copper liquid. If the liquid inlet hole is too small, the copper liquid flowing into the graphite crystallizer is too small, and the copper liquid is easy to leak when the throwing speed is high or the copper liquid is not full. The distribution of the inlet openings is also important. The liquid inlet holes of the horizontal continuous casting TP2 copper tube blank are shown in figure 2, and the four liquid inlet holes are circumferentially distributed by two transverse liquid inlet holes 4 and two longitudinal liquid inlet holes 5, so that the copper liquid flowing into the graphite crystallizer has a clockwise rotation movement trend, which is beneficial to the homogenization of crystal grains when the copper liquid is solidified, has the function of refining the crystal grains, and is beneficial to the escape of air holes and inclusions.
The nitrogen filling holes comprise inner nitrogen filling holes 6, outer nitrogen filling holes 8 and nitrogen filling grooves 9, the inner nitrogen filling holes 6 are radially arranged and eight in number, and the outer nitrogen filling holes 8 are axially arranged and one in number; the inner nitrogen filling hole 6 and the outer nitrogen filling hole 8 are intersected. The grooving position of the nitrogen filling groove 9 is that the groove is opened for a circle along the outer surface of the mold from the outlet of the graphite mold at a position 95mm away from the outlet of the graphite mold, the punching position has two positions, the first position is externally connected with a nitrogen filling hole 8, a small hole with the diameter of 4.2mm is drilled from the top of the mold until the position of the nitrogen filling groove 9 is reached, the externally connected nitrogen filling hole 8 is used for being externally connected with a nitrogen pipe to fill nitrogen into the graphite mold, the second position is internally connected with a nitrogen filling hole 6, and the 8 small holes with the diameter of 3mm are uniformly drilled into the graphite mold along the circumferential direction of the mold at the position of the nitrogen filling groove 9 for uniformly filling nitrogen into the crystallization area position so as to protect the graphite mold. In the embodiment, the outer diameter of a connecting copper pipe (nitrogen filling pipe) is 4mm, the nitrogen filling hole of the die is 4.2mm, the connecting copper pipe and the nitrogen filling pipe are in clearance fit during matching, in order to ensure the nitrogen filling quality, the matching clearance can be sealed by using AB glue, the position of the copper pipe inserted into the nitrogen filling hole is preferably 3-5cm, the other end of the copper pipe is connected with a nitrogen flow meter, a manometer and a nitrogen source by using a hose, the nitrogen flow is adjusted after pulling, then the hose is connected to the nitrogen filling copper pipe, and the nitrogen filling flow is preferably 0.2-0.6L/min. By the method, the graphite die in the crystallization area can be protected, and the surface oxidation of the graphite die is slowed down, so that the traction resistance of a casting blank is reduced, the surface quality of the casting blank is improved, the yield is improved, the service life of the die is prolonged, and the cost and the labor intensity of operators are reduced.
The graphite core 2 is provided with a taper along the axial direction. The change in the diameter of the graphite core 2 in the direction of the ingot is called the taper of the crystallizer. The reasonable taper of the crystallizer can reasonably control heat transfer, throwing force and surface longitudinal crack.
2 taper of graphite core
D. d is the diameter of the thick end and the thin end of the graphite core 2 respectively; and L is the length of the graphite core. The degree of taper isThe method is matched with the solidification shrinkage rule of the casting blank, so that the requirement of heat conduction can be met, and the blank drawing resistance can be reduced. If the taper is too large or not, the graphite core can not be in good contact with the blank shell, and a larger gap is formed between the graphite core and the blank shell, so that the heat transfer and cooling effects of the blank shell through the wall of the crystallizer are weakened, the blank shell is quickly heated, the thickness is reduced, the section is changed into an oval shape, the blank drawing resistance is increased, the blank shell is possibly subjected to temperature return melting leakage, and the blank shell is possibly broken, so that the blank drawing fails; if the taper is too small or not, the throwing resistance is increased sharply, so that the throwing machine is overloaded and the casting blank is not pulled, the phenomenon of slipping is generated, the water gap is frozen quickly, and the throwing fails.
The copper sleeve 7 and the graphite outer sleeve 1 are in interference fit. The wall thickness of the copper bush 7 mainly depends on the section size of the casting blank and the material of the copper bush, and the copper bush can bear the mechanical stress caused by the pressure of cooling water, and is generally 10-15 mm; the wall thickness of a copper sleeve 7 used for horizontally and continuously casting the TP2 copper pipe billet is 10mm, and the length of the copper sleeve 7 is matched with that of a cold area device frame. The copper bush 7 and the graphite outer film are in interference fit, two methods are usually adopted for assembly, one method is that the copper bush 7 is put into a heating furnace to be heated to a certain temperature, then a graphite mold is quickly arranged into the copper bush, and the graphite mold is cooled to room temperature by air; the other method is that circulating high-temperature water is firstly introduced to heat the copper sleeve 7 for a period of time, and then a graphite mould is pressed into the copper sleeve 7 by a press.
The copper sleeve 7 is made of copper-chromium alloy. The copper-chromium alloy is an alloy formed by adding chromium and other trace alloy elements into Cu serving as a matrix. The alloy has high mechanical strength and hardness at room temperature and below 400 ℃, has good electric and heat conducting properties, has the characteristics of high-temperature oxidation resistance, abrasion resistance, good processability and the like, and is widely applied to parts requiring high strength, high hardness, high electric conductivity and heat conductivity at high temperature. The copper sleeve 7 has good heat-conducting property, high hardness, high-temperature wear resistance and high deformation resistance, and pure copper has good heat-conducting property but too low hardness and deformation resistance, so that chromium is added into the pure copper to improve the hardness and the wear resistance of the pure copper. The copper bush is used for fixing the graphite mould and transferring heat.
Generally, the length of the graphite crystallizer is increased within a certain range, so that the tube blank can be fully cooled in the graphite crystallizer, the blank drawing speed can be increased, and the production capacity of equipment can be improved. However, the longer the crystallizer, the larger the friction surface between the tube blank and the wall of the graphite crystallizer, which increases the traction resistance, is not favorable for the traction of the tube blank, and also has a bad influence on the surface quality of the tube blank, which makes the surface of the tube blank rough.
Since the heat-conducting property of graphite is not good enough to metal, the wall of the graphite jacket should not be too thick, otherwise the heat-conducting effect will be affected. There is often an illusion that increasing the wall thickness of the graphite jacket may improve its service life, but otherwise, it has been found in practice that wear of the graphite jacket is insignificant over 56 hours of continuous use of the graphite mold. The inner wall of the graphite jacket is roughened and ground into deeper linear grooves, so that the surface of the tube blank is severely scratched and the tube blank is stopped. The graphite mold used for horizontally and continuously casting the TP2 copper tube billet has the wall thickness of 17.5 mm.
The above is an embodiment of the present invention. The embodiments and specific parameters in the embodiments are only for the purpose of clearly showing the verification process of the utility model, and are not used to limit the scope of the utility model, which is defined by the claims, and all the equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be included in the scope of the utility model.
Claims (7)
1. The utility model provides a horizontal continuous casting is with novel graphite jig which characterized in that:
the novel graphite shell comprises a graphite outer sleeve and a graphite core, wherein the graphite core is arranged in the graphite outer sleeve, a copper sleeve is sleeved on the outer side of the graphite outer sleeve, a liquid inlet hole is formed in the graphite outer sleeve, and a nitrogen filling hole is formed in the graphite outer sleeve.
2. The novel graphite mold for horizontal continuous casting according to claim 1, wherein:
the graphite outer sleeve and the graphite core are assembled together through a graphite pin.
3. The novel graphite mold for horizontal continuous casting according to claim 1, wherein:
the feed liquor hole is followed graphite overcoat is equipped with four, is circumference and arranges.
4. The novel graphite mold for horizontal continuous casting according to claim 1, wherein:
the nitrogen charging holes comprise inner nitrogen charging holes, outer nitrogen charging holes and nitrogen charging grooves, the inner nitrogen charging holes are radially arranged and eight in number, and the outer nitrogen charging holes are axially arranged and one in number; the inner nitrogen charging hole and the outer nitrogen charging hole are intersected with the nitrogen charging groove.
5. The novel graphite mold for horizontal continuous casting according to claim 1, wherein:
the graphite core is provided with a taper along the axial direction.
6. The novel graphite mold for horizontal continuous casting according to claim 1, wherein:
the copper sleeve and the graphite outer sleeve are in interference fit.
7. The novel graphite mold for horizontal continuous casting according to claim 1, wherein:
the copper sleeve is made of copper-chromium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122822920.XU CN216096300U (en) | 2021-11-17 | 2021-11-17 | Novel graphite mold for horizontal continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122822920.XU CN216096300U (en) | 2021-11-17 | 2021-11-17 | Novel graphite mold for horizontal continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216096300U true CN216096300U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122822920.XU Expired - Fee Related CN216096300U (en) | 2021-11-17 | 2021-11-17 | Novel graphite mold for horizontal continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216096300U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115519081A (en) * | 2022-11-28 | 2022-12-27 | 富威科技（吴江）有限公司 | Metal horizontal continuous casting method |
-
2021
- 2021-11-17 CN CN202122822920.XU patent/CN216096300U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115519081A (en) * | 2022-11-28 | 2022-12-27 | 富威科技（吴江）有限公司 | Metal horizontal continuous casting method |
| CN115519081B (en) * | 2022-11-28 | 2023-03-10 | 富威科技（吴江）有限公司 | Metal horizontal continuous casting method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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