CN103098148A - Process for manufacturing a casting made of ductile cast iron for a high-voltage insulator fitting - Google Patents
Process for manufacturing a casting made of ductile cast iron for a high-voltage insulator fitting Download PDFInfo
- Publication number
- CN103098148A CN103098148A CN2010800688825A CN201080068882A CN103098148A CN 103098148 A CN103098148 A CN 103098148A CN 2010800688825 A CN2010800688825 A CN 2010800688825A CN 201080068882 A CN201080068882 A CN 201080068882A CN 103098148 A CN103098148 A CN 103098148A
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- China
- Prior art keywords
- cast iron
- cap
- voltage electrical
- electrical insulator
- casting
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- 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
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/02—Suspension insulators; Strain insulators
- H01B17/06—Fastening of insulator to support, to conductor, or to adjoining insulator
- H01B17/08—Fastening of insulator to support, to conductor, or to adjoining insulator by cap-and-bolt
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Insulators (AREA)
- Insulating Bodies (AREA)
Abstract
The process for manufacturing a casting for a high-voltage insulator fitting, by casting a ductile cast iron that contains proportionally between 3.2% and 3.7% carbon, between 1.9% and 2.5% silicon, between 0.1% and 0.5% manganese and between 0.04% and 0.08% phosphorus, comprises the following steps: the casting is cast with a greater than 85% degree of nodularization in a mould; and, after removal from the mould, the casting undergoes a two-step ferritization heat treatment whereby the casting is heated at a temperature of between 850 DEG C and 990 DEG C for a time of between 1 and 5 hours and then cooled to a temperature of between 700 DEG C and 800 DEG C for a time of between 2 and 6 hours.
Description
Technical field
The present invention relates to be intended to for the field of high-voltage electrical insulator fastening, that keep or support the electric conductor of naked or insulation.
Background technology
This electric(al) insulator can or be made based on the composite synthesis material of organosilicon, EPDM or other any insulating material such as resin (epoxy resin etc.) or epoxy resin-concrete mix by glass, pottery.
For example, cap and pin insulator comprises two secure components, more particularly is respectively fixed to cap and pin on two opposite faces of electrical insulation glass cup.This cup (coupelle) is formed as has fin, and described fin extends creepage distance, i.e. distance between the two poles of the earth of glass insulator.The cap of such insulator obtains by the casting of ductile cast iron usually.The pin of this insulator is used for being hooked in the cap of another insulator to obtain Suspension Insulators for HV Transmission Lines.
Ceramic insulator is generally the form of the solid of electric insulation ceramics or hollow tubular post.This ceramics pole is formed as to have exterior insulation characteristic (creepage distance etc.) and has two ends, tightens intrinsic fastening (ferrures) of being made by ductile cast iron equally at these two ends.
Composite insulator also has the main body of elongated shape, and its moulding and comprise the fastening that can be made by cast iron or steel at its end as mentioned above.
All these insulators of being made by glass, pottery or composite material can be used under harsh weather conditions, as at the temperature of-40 ° of C.Under these extreme temperature conditions, the secure component itself of being made by ductile cast iron must have in the very high mechanical property aspect tensile strength and impact toughness (impact strength).
Especially, these secure components of being made by ductile cast iron should have under-40 ° of C by the Sha Er skin test and test its individual values that (for example according to standard EN 10045) determine greater than 9 joules and the mean value impact strength greater than 12 joules.
Up to now, the ductile cast iron (being spheroidal graphite GS cast iron) that usually uses different stage is with for the manufacture of these secure components.The selection of the ductile cast iron of these different stages is to carry out according to different application and serviceability temperature condition.Although the ductile cast iron that has the good impact strength value under-40 ° of C is arranged, usually to find, the mechanical property of the tensile strength aspect of other cast iron of these grades is worse than the individual features of conventional cast iron.
Summary of the invention
The object of the present invention is to provide a kind of secure component (piece de fixation) for make being used in the following way high-voltage electrical insulator: casting ductility foundry goods so that can obtain is being low to moderate the parts that have simultaneously good tensile strength properties and good impact strength performance when using at the temperature of-40 ° of C always.
The present invention based on idea be to use as follows ductile cast iron, the composition of described ductile cast iron and nodularization rate (taux de nodularisation) are selected giving the good tensile strength of foundry goods in large serviceability temperature scope, and then the parts of the demoulding are imposed the ferrite heat-transmission and process to strengthen their cold impact strength.
For this reason, the invention provides a kind ofly for be used for the method for the secure component of high-voltage electrical insulator by casting ductile cast iron manufacturing, it is characterized in that the method comprises the following steps:
This cast iron comprises the carbon of following ratio: 3.2%-3.7%, the silicon of 1.9%-2.5%, the manganese of 0.1%-0.5% and the phosphorus of 0.04%-0.08%, foundry goods has the nodularization rate greater than 85%, and imposes ferrite heat-transmission processing at the upper parts to the demoulding of two platforms (paliers) after cast iron solidifies:
-parts of the demoulding being heated to the temperature of 850 ° of C-990 ° of C, the duration is 1-5 hour; And
-parts of this demoulding being cooled to the temperature of 700 ° of C-800 ° of C, the duration is 2-6 hour.The embodiment of the inventive method is described below with reference to accompanying drawing.
Description of drawings
Fig. 1 shows the cap and pin insulator that has by the cap of ductile cast iron casting.
Fig. 2 is for showing the heat treated figure of ferriteization of the inventive method.
Embodiment
In Fig. 1, this cap aciculiform high-tension insulator comprises the insulating element 1 of being made by glass, is fixed with by the cap 2 of iron casting thereon on top and is fixed with pin 3 in the bottom.
Usually the ratio in composition affects its tensile strength properties and its low temperature impact strength performance to the chemical element that exists in ductile cast iron according to them.Silicon is a kind of while for equal most important element tensile strength and the transition temperature from the ductility state to brittle state.Manganese and phosphorus impact cold toughness (t é nacit é).
According to the present invention, be as follows cast iron for the manufacture of the ductile cast iron of insulator cap, the composition of described foundry goods makes foundry goods comprise the carbon of the chemical composition of following ratio: 3.2%-3.7%; The silicon of 1.9%-2.5%; The manganese of 0.1%-0.5% and the phosphorus of 0.04%-0.08%.This cast iron should have greater than 85% in the cap of casting, be preferably greater than 90% nodularization rate, and it also can comprise the copper of 0.1-1%.
In order to make cap 2, ratio and the nodularization rate of the chemical element by controlling above indication are poured into the mould with core with this ductile cast iron under about 1400 ° of C, with solidify at cast iron and the demoulding after obtain cap or the fastening of thick state.
For example, three nodularizations be can carry out, in holding furnace, in ladle pot (poche), band heart yearn or other method used, then in mould.
After the demoulding, the cast iron cap of thick state carries out the ferrite heat-transmission on two platforms shown in Figure 2 processes.
In the first platform A, cap is heated to the temperature of 850 ° of C-990 ° of C in stove, and the duration is 1-5 hour, and preferred 3-4 hour, but this temperature should be more than or equal to α/γ transition temperature Ac3.
Afterwards, in the second temperature platform B, this cap is cooled to steady temperature in stove, and the duration is 2-6 hour, and preferred 2-3 hour, this temperature was 700 ° of C-800 ° of C.
Then taking out this cap less than 300 ° of C or at greater than the temperature of 600 ° of C from stove.
When this heat treatment finished, the structure of this cap was fully ferritic.The Sha Er skin test that carries out on sample under-40 ° of C is tested the impact strength that demonstrates minimum 9 joules and average 12 joules.Tensile strength is measured as 430Mpa.
Method of the present invention also may be used on the fastening for the high-tension insulator of being made by pottery or composite material.
Claims (according to the modification of the 19th of treaty)
1. be used for being used for by the manufacturing of casting ductile cast iron the method for the secure component of high-voltage electrical insulator, it is characterized in that the method comprises the following steps:
-make described cast iron moulding, so that the secure component of described casting comprises the carbon of following ratio: 3.2%-3.7%, the silicon of 1.9%-2.5%, the manganese of 0.1%-0.5% and the phosphorus of 0.04%-0.08%, surplus comprises iron at least, and foundry goods has the nodularization rate greater than 85%, and
-parts to the demoulding impose ferrite heat-transmission processing on two platforms after cast iron solidifies: the parts of the demoulding are heated to the temperature of 850 ° of C-990 ° of C, the duration is 1-5 hour; The parts of this demoulding are cooled to the temperature of 700 ° of C-800 ° of C, the duration is 2-6 hour, so that the cast iron of cooling parts has ferrite structure.
2. cap aciculiform high-voltage electrical insulator, comprise the castiron cap by the method acquisition of claim 1.
3. ceramic high-voltage electrical insulator, comprise the castiron end fastening by the method acquisition of claim 1.
4. the composite material high-voltage electrical insulator, comprise the castiron end fastening by the method acquisition of claim 1.
5. the synthetic material high-voltage electrical insulator, comprise the castiron end fastening by the method acquisition of claim 1.
D1 has described a kind of method for the manufacture of ductile cast iron, wherein:
-phosphorus concentration is less than the application's phosphorus concentration required for protection,
The duration of the-the second platform is less than the application's corresponding duration required for protection,
-the cast iron that obtains have wherein ferrite along
PearliteCrystal boundary form the structure (summary, 12-13 is capable) of network.
D1 does not explicitly point out the nodularization rate of this cast iron, only mention the form (summary, the 1st row) of spheroidal graphite, and D1 does not relate to the field of high-voltage electrical insulator.
The application's claim 1 is with respect to D1 thereby be new, and the present invention proposes the improvement for the manufacture of the method for the ductile cast iron that is used for the high-voltage electrical insulator parts, so that can obtain to have the cast iron (the 2nd page " summary of the invention " part the 2nd section) of good cold-resistant impact strength (or impact toughness) and good tensile strength.
As what explicitly point out in specification, the concentration of chemical element should be good (the 3rd page of the 14th row) controlled and phosphorus impact cold toughness (the 3rd page of 7-8 is capable).The performance and its composition that are known that alloy are closely related very much, the interpolation of the phosphorus of the specific concentrations of 0.04%-0.08% thereby of course not apparent.
Due to the composition of cast iron and the ferrite processing on two platforms that thick state cast iron is applied (the 3rd page of 19-20 is capable), the method according to this invention can obtain ferrite cast iron (the 3rd page of inverse the 2nd row).On the contrary, in D1, the cast iron that obtains is part pearlitic (12-13 is capable for D1, summary).
The tensile strength and the impact strength that are known that cast iron are reverse relevant, obtain better tensile strength and will reduce impact strength, and vice versa.Especially be known that the existence at the cast iron medium pearlite will cause in the good result aspect tensile strength, but the result aspect impact strength is not so good.The method of the application of the invention can obtain to be provided at tensile strength (430Mpa)
AndExcellent results aspect impact strength (testing middle minimum 9 joules and average 12 joules at the Sha Er skin test under-40 ° of C), this be beat all to those skilled in the art (the 3rd page of inverse 1-2 is capable).
Thereby the method according to this invention can solve the problem of bringing with regard to D1.
D2 has described a kind of cap and pin insulator, and its pin is made (the 2nd page of 5-20 is capable) by malleable cast iron.D2 does not specifically describe the cap of this insulator and the composition of this cast iron.
D3 has described a kind of cap and pin insulator, and its cap makes (the 1st hurdle last column) by malleable cast iron and pin is made (the 2nd hurdle 1-3 is capable) by stainless steel.D3 does not specifically describe the composition of this steel or this cast iron.
D4 relates to a kind of method of making ductile cast iron, according to the method, this cast iron is heated to the temperature of 830 ° of C-900 ° of C, and the duration is 2-4 hour.D4 does not describe the composition of this cast iron, does not describe another heating platform of this cast iron yet.
Claims (5)
1. be used for being used for by the manufacturing of casting ductile cast iron the method for the secure component of high-voltage electrical insulator, it is characterized in that the method comprises the following steps:
This cast iron comprises the carbon of following ratio: 3.2%-3.7%, the silicon of 1.9%-2.5%, the manganese of 0.1%-0.5% and the phosphorus of 0.04%-0.08%, foundry goods have the nodularization rate greater than 85%, and after cast iron solidifies on two platforms the parts to the demoulding impose ferrite heat-transmission processing:
-parts of the demoulding being heated to the temperature of 850 ° of C-990 ° of C, the duration is 1-5 hour; And
-parts of this demoulding being cooled to the temperature of 700 ° of C-800 ° of C, the duration is 2-6 hour.
2. cap aciculiform high-voltage electrical insulator, comprise the castiron cap by the method acquisition of claim 1.
3. ceramic high-voltage electrical insulator, comprise the castiron end fastening by the method acquisition of claim 1.
4. the composite material high-voltage electrical insulator, comprise the castiron end fastening by the method acquisition of claim 1.
5. the synthetic material high-voltage electrical insulator, comprise the castiron end fastening by the method acquisition of claim 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FR2010/051824 WO2012028789A1 (en) | 2010-09-02 | 2010-09-02 | Process for manufacturing a casting made of ductile cast iron for a high-voltage insulator fitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103098148A true CN103098148A (en) | 2013-05-08 |
Family
ID=43911046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800688825A Pending CN103098148A (en) | 2010-09-02 | 2010-09-02 | Process for manufacturing a casting made of ductile cast iron for a high-voltage insulator fitting |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103098148A (en) |
| WO (1) | WO2012028789A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104988378A (en) * | 2015-06-11 | 2015-10-21 | 安徽省宁国诚信耐磨材料有限公司 | Mold special for ductile iron grinding balls and manufacturing technology of mold |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB313540A (en) * | 1928-01-13 | 1929-06-13 | Brown Boveri & Cie Ag Abteilun | Improvements in suspension insulators |
| JPH0813079A (en) * | 1994-07-01 | 1996-01-16 | Mazda Motor Corp | Spheroidal graphite cast iron and production thereof |
| CN1540684A (en) * | 2003-04-23 | 2004-10-27 | ɪ���ˣ�����˾�������������� | Hanging insulator with sealing plug |
| CN201298405Y (en) * | 2008-09-26 | 2009-08-26 | 上海市南供电设计有限公司 | Bar-shaped suspension type porcelain insulator of steel caps with same shapes |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1543444A (en) * | 1967-09-13 | 1968-10-25 | Insulator for high voltage overhead lines | |
| SU1182085A1 (en) * | 1982-12-22 | 1985-09-30 | Институт проблем литья АН УССР | Method of annealing high-strength cast iron with globular graphite |
-
2010
- 2010-09-02 CN CN2010800688825A patent/CN103098148A/en active Pending
- 2010-09-02 WO PCT/FR2010/051824 patent/WO2012028789A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB313540A (en) * | 1928-01-13 | 1929-06-13 | Brown Boveri & Cie Ag Abteilun | Improvements in suspension insulators |
| JPH0813079A (en) * | 1994-07-01 | 1996-01-16 | Mazda Motor Corp | Spheroidal graphite cast iron and production thereof |
| CN1540684A (en) * | 2003-04-23 | 2004-10-27 | ɪ���ˣ�����˾�������������� | Hanging insulator with sealing plug |
| CN201298405Y (en) * | 2008-09-26 | 2009-08-26 | 上海市南供电设计有限公司 | Bar-shaped suspension type porcelain insulator of steel caps with same shapes |
Non-Patent Citations (2)
| Title |
|---|
| 王守忠等: "低温用铁素体球墨铸铁的研制", 《金属加工（热加工）》, no. 19, 31 December 2008 (2008-12-31), pages 60 - 61 * |
| 赵金锋等: "QT400-18高韧性球墨铸铁的生产", 《现代铸铁》, no. 3, 30 June 2005 (2005-06-30), pages 40 - 42 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104988378A (en) * | 2015-06-11 | 2015-10-21 | 安徽省宁国诚信耐磨材料有限公司 | Mold special for ductile iron grinding balls and manufacturing technology of mold |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012028789A1 (en) | 2012-03-08 |
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Application publication date: 20130508 |