CN101934354A - Low-alloy gray cast iron piston ring casting process - Google Patents
Low-alloy gray cast iron piston ring casting process Download PDFInfo
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- CN101934354A CN101934354A CN 201010271234 CN201010271234A CN101934354A CN 101934354 A CN101934354 A CN 101934354A CN 201010271234 CN201010271234 CN 201010271234 CN 201010271234 A CN201010271234 A CN 201010271234A CN 101934354 A CN101934354 A CN 101934354A
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- 238000005266 casting Methods 0.000 title claims abstract description 30
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 11
- 239000000956 alloy Substances 0.000 title claims abstract description 11
- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 124
- 229910052742 iron Inorganic materials 0.000 claims abstract description 62
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 abstract description 6
- 238000004781 supercooling Methods 0.000 abstract description 6
- 239000002054 inoculum Substances 0.000 abstract 3
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 abstract 1
- 230000002950 deficient Effects 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 15
- 230000003321 amplification Effects 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000036651 mood Effects 0.000 description 2
- 101100433727 Caenorhabditis elegans got-1.2 gene Proteins 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- ZTXONRUJVYXVTJ-UHFFFAOYSA-N chromium copper Chemical compound [Cr][Cu][Cr] ZTXONRUJVYXVTJ-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a low-alloy gray cast iron piston ring casting process. In the process, an adopted process flow comprises molding, smelting, pouring, shakeout cleaning and blank appearance separation. In the smelting step, when a section coefficient of a cast piston ring blank is less than or equal to 1.2, carbon content in a furnace is controlled to be 3.75 to 3.80 percent based on the total weight of molten iron in the furnace and the addition of an inoculant is controlled to be 0.3 to 0.4 percent based on the net weight of the molten iron in a ladle; when the section coefficient of the piston ring blank is more than 1.2, the carbon content in the furnace is controlled to be 3.70 to 3.75 percent based on the total weight of the molten iron in the furnace and the addition of the inoculant is controlled to be 0.2 to 0.3 percent based on the net weight of the molten iron in the ladle; and when the section coefficient of the piston ring blank is less than or equal to 1.0, the carbon content in the furnace is controlled to be 3.75 to 3.80 percent based on the total weight of the molten iron in the furnace, 0.08 to 0.12 percent of silicon carbide is added based on the total weight of the remaining molten iron in the furnace, and the addition of the inoculant is controlled to be 0.3 to 0.4 percent based on the net weight of the molten iron in the ladle. The low-alloy gray cast iron piston ring casting process has the advantages of reducing the super-cooling tendency of the molten iron in the furnace, controlling the metallographical rejection rate to be about 4 percent, improving the quality and reliability of materials and greatly improving the percent of pass.
Description
Technical field
The present invention relates to a kind of processing technology of piston ring blank, is the technology of low-alloy grey-cast iron piston ring specifically.
Background technology
Available engine is made up of top compression ring, the second road compression ring, the 3rd road combined type helical supporting spring oil ring with the piston ring group; It is the alloy wear-resisting cast iron materials that the three road ring overwhelming majority adopt chromium-copper.Most of piston ring blank adopts monomer monolithic wet type sand casting process, and because of piston ring blank belongs to the thin-walled smallclothes, cooling velocity is fast, and have following shortcoming: Graphite Distribution is inhomogeneous, and having with the D type is that main heart portion undercooled graphite exists.First and second road ring is generally flat ring, and section factor is little, exists the cold excessively probability of heart portion big, and the big probability in distributed areas is big; The 3rd road ring is generally oil ring, and section factor is big, exists the cold excessively probability of heart portion little, and the big probability in distributed areas is little.
General domestic and international material standard is not done strict control to the cold excessively requirement of heart portion, and my company supplies with the material standard of the NHC-10 of Mahle Internat GmbH and clearly advises cold excessively size of bourrelet and distributional pattern: 100 times when amplifying, undercooled graphite zone length≤1.0mm, the undercooled graphite zone does not allow to surpass 3 in the evaluation visual field, decides the zone with the cold comment excessively of maximum and evaluates.Every bag was got 1 when material commonly used was taken a sample in the stokehold, in the end a folded sampling; And the NHC-10 of Mahle Internat GmbH material requirements when taking a sample in the stokehold every bag get 2, in first folded and last folded sampling of every bag.The stokehold metallographic scrappage of my company's conventional material and at the cold excessively specific (special) requirements of the heart portion of bridle NHC-10, increases the stokehold and gets two samples about 0.5%, goes out the control of sampling inspection again after foundry's check and the timeliness, and the metallographic scrappage is about 15～20%.
Summary of the invention
Goal of the invention: the objective of the invention is to overcome the defective of prior art, a kind of casting technique of low-alloy grey-cast iron piston ring is provided, purpose reduces or eliminates the cold excessively phenomenon of piston ring heart portion, improves the qualification rate of product.
Technical scheme:
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of low-alloy grey-cast iron piston ring casting technique, it comprises following technological process: moulding, melting-cast-peeling-blank outward appearance sorting; In the wherein said melting step,
When the section factor≤1.2 of the piston ring blank of casting, in the control stove carbon content be in the stove molten iron gross weight 3.75～3.80%, in every iron clad water, innoculant adding quantity is 0.3～0.4% of molten iron nt wt net weight in the bag;
When the section factor of piston ring blank＞1.2, carbon content is the 3.70-3.75% of molten iron gross weight in the stove in the control stove, and in every iron clad water, innoculant adding quantity is the 0.2-0.3% of molten iron nt wt net weight in the bag;
When the section factor of piston ring blank≤1.0, carbon content is the 3.75-3.80% of molten iron gross weight in the stove in the control stove, add the carborundum of residue molten iron gross weight 0.08～0.12% in the stove again, in every iron clad water, innoculant adding quantity is the 0.3-0.4% of the nt wt net weight of molten iron in the bag.
Among the present invention, use every stove to pour into a mould and wrap inferior molten iron cast casting pig piston ring blank after second round reaches, go out the interior temperature of molten iron forehearth and be controlled at 1490～1520 ℃, the pouring temperature of casting pig blank is controlled at 1425～1440 ℃.
Among the present invention, when if temperature is higher than 1490～1520 ℃ of target temperature controlling values in the stove, adopt following method to make temperature reach required temperature: every bag adds the foundry returns of the same trade mark material of 50～100kg, and the full power intensification made tapping temperature reach 1490～1520 ℃ in 30～60 seconds, to be incubated power then and be controlled at 20～40kw, and can make pouring temperature reach 1425～1440 ℃ of target temperature.
Beneficial effect: 1, the present invention suitably improves the percentage composition of carbon in the stove, thereby reduces the super cooling tendency of molten iron in the stove; Existing technology clearly must not pressed the optimum value that the section factor size is set C content, makes the cold excessively probability of heart portion increase greatly; C content is on the low side in the existing technology stove, and the super cooling tendency of molten iron is bigger in the stove.
2, innoculant adding quantity in the moderate reduction bag of the present invention can reduce the super cooling tendency of every iron clad water; Existing technology clearly must not pressed the best additional proportion of the height setting inovulant of section factor size, carbon content, can reduce the super cooling tendency of every iron clad water after pregnant amount appropriateness of the present invention reduces yet.
3, the present invention adopts lower pouring temperature, can reduce the super cooling tendency of every iron clad water; 1540～1570 ℃ of the tapping temperatures of existing technology, 1420～1490 ℃ of pouring temperatures (folded) in first, existing technology reduces about 50 ℃ of the highest pouring temperature effectively, has significantly reduced the cold excessively probability of heart portion.
4, adopt the technology of heat bag, secondary charging in the stove after the whole preheatings of casting ladle, strict control tapping temperature and electric furnace insulation power parameter, the extreme difference of the pouring temperature between guaranteeing to wrap time is in 15 ℃.Maximum temperature difference is nearly 70 ℃ between former technology bag time, and existing technology is by strict control tapping temperature and electric furnace insulation power, and the extreme difference of the pouring temperature between guaranteeing to wrap time is in 15 ℃.
5, the present invention is controlled at about 4% the metallographic percent defective of NHC-10 material, because of the underproof the rate of complaints of material≤0.1%; Improve the quality and the reliability of material, guaranteed to satisfy client's specific (special) requirements, improved company's market competitiveness.Because the raising greatly of qualification rate, order is increased to more than 500,000 slices/month by former 200,000 slices/month.
Description of drawings
Fig. 1: under 100 times of amplification situations, the typical heart undercooled graphite figure of portion, defective.
Fig. 2: under 100 times of amplification situations, concentrate distribution heart portion cold excessively＞1.0mm, defective.
Fig. 3: under 100 times of amplification situations, normal graphite form, the portion of not being in the mood for is cold excessively, and is qualified.
Fig. 4: under 100 times of amplification situations, heart portion crosses cold 2, and is qualified.
Fig. 5 is for adopting technology of the present invention and adopting the metallographic percent defective schematic diagram that has technology now.
The specific embodiment:
Below in conjunction with accompanying drawing the present invention is done further explanation.
According to following embodiment, can better understand the present invention.Yet, those skilled in the art will readily understand that the described concrete material proportion of embodiment, process conditions and result thereof only are used to illustrate the present invention, and should also can not limit the present invention described in detail in claims.
Graphite form is divided into A type, Type B, C type, D type, E type, F type.
As shown in Figure 1, 2, be that heart portion is cold excessively, and is defective under 100 times of amplification situations.
Fig. 1 is D type+F type+A type, skewness, and zone line is based on the D type, and is defective.
Fig. 2 is D type+F type+A type, and skewness, zone line are concentrated to distribute based on the D type, and length＞1.0mm is defective.
Fig. 3 is A type+F type+a small amount of Type B, evenly distributes, and the portion of not being in the mood for is cold excessively, and is qualified.
Fig. 4 is A type+F type+a small amount of Type B, skewness, and heart portion crosses that cold the centre must be separated fully with interior (comprising 2) at 2, and monolithic is the longest≤1.0mm is qualified.
Among Fig. 5, lateral coordinates is month, and vertical coordinate is a qualification rate.Technology of the present invention is being produced utilization since in mid or late December, 2009, and the good results are evident in improvement; Have an appointment in the waste product in January, 2010 about 10% be produce in December, 09 check appearance once more in later process; In addition when monthly manufacturing capacity 〉=1000 bag, the kind quantity of section factor≤1.0 accounts for ratio 〉=30% o'clock of total amount, and the metallographic scrappage relatively can be higher.The kind of section factor≤1.0 is the about 25-30% of metallographic percent defective before improvement, improves the about 5-8% of back percent defective; The product of section factor 1.0-1.2, percent defective is 10-12% before improving, and improves the back percent defective about 4%; The product of section factor＞1.2, percent defective is 3-5% before improving, and improves the back percent defective in 1%; What Fig. 5 added up is average metallographic percent defective.
Embodiment 1:
The NHC-10 casting pig piston ring of supplying with Mahle Internat GmbH with my company is an example, and its casting technique comprises the steps: moulding, melting-cast-peeling-blank outward appearance sorting.
In the wherein said melting step, when the piston ring blank kind AP0022376-00E of casting puts down, the blank section factor is 1.12 o'clock, the gross mass of molten iron is the 2300kg/ stove in the smelting furnace, carbon content is 3.76% of the interior molten iron gross weight of stove in the stove, in every iron clad water, innoculant adding quantity is 0.4% of molten iron nt wt net weight in the bag.
Cast second round and later bag time molten iron cast bridle blank go out the interior temperature of molten iron forehearth and are controlled at 1490～1520 ℃ in the use stove, and pouring temperatures of all cast bridle casting pig blank processes are controlled at 1425～1440 ℃.The graphite form of the piston ring that makes such as Fig. 3 or shown in Figure 4.
Embodiment 2:
The NHC-10 casting pig piston ring of supplying with Mahle Internat GmbH with my company is an example, and its casting technique comprises the steps: moulding, melting-cast-peeling-blank outward appearance sorting.
In the wherein said melting step, piston ring blank kind AN0021584-050 is flat, the blank section factor is 1.18 o'clock, the gross mass of molten iron is the 2300kg/ stove in the smelting furnace, carbon content is 3.79% of the interior molten iron gross weight of stove in the stove, in every iron clad water, innoculant adding quantity is 0.3% of molten iron nt wt net weight in the bag.
Cast second round and later bag time molten iron cast bridle blank go out the interior temperature of molten iron forehearth and are controlled at 1490～1520 ℃ in the application stove, and pouring temperatures of all cast bridle casting pig blank processes are controlled at 1425～1440 ℃.The graphite form of the piston ring that makes such as Fig. 3 or shown in Figure 4.
Embodiment 3:
The NHC-10 casting pig piston ring of supplying with Mahle Internat GmbH with my company is an example, and its casting technique comprises the steps: moulding-melting-cast-peeling-blank outward appearance sorting;
In the wherein said melting step, when the piston ring blank kind AP0021784-00E of casting puts down, the blank section factor is 1.43 o'clock, the gross weight of molten iron is the 2300kg/ stove in the smelting furnace, carbon content is 3.71% of molten iron gross weight in the bag in the stove, in every iron clad water, innoculant adding quantity is 0.25% of molten iron nt wt net weight in the bag.
Cast second round and later bag time molten iron cast bridle blank go out the interior temperature of molten iron forehearth and are controlled at 1490～1520 ℃ in the application stove, and pouring temperatures of all cast bridle casting pig blank processes are controlled at 1425～1440 ℃.The graphite form of the piston ring that makes such as Fig. 3 or shown in Figure 4.
Embodiment 4:
The NHC-10 casting pig piston ring of supplying with Mahle Internat GmbH with my company is an example, and its casting technique comprises the steps: moulding-melting-cast-peeling-blank outward appearance sorting;
In the wherein said melting step, the piston ring blank kind AP0022135-05E of casting is flat, and the blank section factor is 0.89 o'clock, and the gross weight of molten iron is the 2300kg/ stove in the smelting furnace, carbon content is 3.78% of the interior molten iron gross weight of stove in the stove, adds 0.1% carborundum by residue iron water amount in the stove.In present embodiment, pourable 8 bags of the molten iron of 2300kg, general residue molten iron 1700kg in the stove, the addition of carborundum is 1.7kg so; If when temperature is higher than 1490～1520 ℃ of target temperature controlling values in the stove, can adopt following method to make temperature reach required temperature: add the foundry returns of the same trade mark NHC-10 material of 70kg, and full power 30～60 seconds temperature to target control that heat up; Add inovulant, innoculant adding quantity is 0.35% of molten iron nt wt net weight in the bag; Insulation power is controlled at 20～40kw, makes pouring temperature reach 1425～1440 ℃ of target temperatures.
Use cast second round and later bag time molten iron cast bridle blank in the stove.The graphite form of the piston ring that makes such as Fig. 3 or shown in Figure 4.
Claims (3)
1. low-alloy grey-cast iron piston ring casting technique, it is characterized in that: it comprises following technological process: moulding, melting-cast-peeling-blank outward appearance sorting;
In the wherein said melting step,
When the section factor≤1.2 of the piston ring blank of casting, in the control stove carbon content be in the stove molten iron gross weight 3.75～3.80%, in every iron clad water, innoculant adding quantity is 0.3～0.4% of molten iron nt wt net weight in the bag;
When the section factor of piston ring blank＞1.2, carbon content is the 3.70-3.75% of molten iron gross weight in the stove in the control stove, and in every iron clad water, innoculant adding quantity is the 0.2-0.3% of molten iron nt wt net weight in the bag;
When the section factor of piston ring blank≤1.0, carbon content is the 3.75-3.80% of molten iron gross weight in the stove in the control stove, add the carborundum of residue molten iron gross weight 0.08～0.12% in the stove again, in every iron clad water, innoculant adding quantity is the 0.3-0.4% of the nt wt net weight of molten iron in the bag.
2. a kind of low-alloy grey-cast iron piston ring casting technique according to claim 1, it is characterized in that: use every stove to pour into a mould and wrap inferior molten iron cast casting pig piston ring blank after second round reaches, go out the interior temperature of molten iron forehearth and be controlled at 1490～1520 ℃, the pouring temperature of casting pig blank is controlled at 1425～1440 ℃.
3. a kind of low-alloy grey-cast iron piston ring casting technique according to claim 1 is characterized in that: if when temperature is higher than 1490～1520 ℃ of target temperature controlling values in the stove, adopt following method to make temperature reach required temperature:
Every bag adds the foundry returns of the same trade mark material of 50～100kg, and full power heats up and made tapping temperature reach 1490～1520 ℃ in 30～60 seconds, will be incubated power then and be controlled at 20～40kw, can make pouring temperature reach 1425～1440 ℃ of target temperature.
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| CN 201010271234 CN101934354A (en) | 2010-08-31 | 2010-08-31 | Low-alloy gray cast iron piston ring casting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103394658A (en) * | 2013-08-15 | 2013-11-20 | 安庆帝柏格茨缸套有限公司 | Synchronous smelting method of molten iron for producing cylinder liners |
| CN113204839A (en) * | 2021-04-13 | 2021-08-03 | 广西大学 | Evaluation method for reliability of extrusion casting process parameter data |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1303286A (en) * | 1970-04-29 | 1973-01-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1303286A (en) * | 1970-04-29 | 1973-01-17 |
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| 《中国铸造装备与技术》 20071231 李自军 非热处理灰铸铁活塞环的铸造技术 , 2 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103394658A (en) * | 2013-08-15 | 2013-11-20 | 安庆帝柏格茨缸套有限公司 | Synchronous smelting method of molten iron for producing cylinder liners |
| CN103394658B (en) * | 2013-08-15 | 2015-09-02 | 安庆帝伯格茨缸套有限公司 | A kind of synchronous method of smelting producing cylinder sleeve molten iron |
| CN113204839A (en) * | 2021-04-13 | 2021-08-03 | 广西大学 | Evaluation method for reliability of extrusion casting process parameter data |
| CN113204839B (en) * | 2021-04-13 | 2023-04-25 | 广西大学 | An evaluation method for data reliability of squeeze casting process parameters |
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Application publication date: 20110105 |