CN107604236A - A kind of method for improving lathe casting hardness - Google Patents
A kind of method for improving lathe casting hardness Download PDFInfo
- Publication number
- CN107604236A CN107604236A CN201710862576.2A CN201710862576A CN107604236A CN 107604236 A CN107604236 A CN 107604236A CN 201710862576 A CN201710862576 A CN 201710862576A CN 107604236 A CN107604236 A CN 107604236A
- Authority
- CN
- China
- Prior art keywords
- casting die
- casting
- liquation
- sprue cup
- hardness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of method for improving lathe casting hardness, steel scrap, foundry return, the new pig iron are put into electric furnace and melted, furnace temperature is arranged on 1,400 1600 DEG C, then add and breed 75Si Fe, pregnant amount 0.3 0.7%, liquation A is made, liquation A is poured into casting die out of casting die sprue cup.Carbon atom diffusion is hindered, micro-antimony Sb is added in gray iron, it is possible to strongly facilitates and stabilizing pearlite, improves the hardness of matrix, improve the performance of casting.Can be applied directly to when tapping a blast furnace in casting die, it is necessary to how much with how much, Melting control is more convenient.Further, since Sb addition is seldom economically and very worthwhile.
Description
Technical field
The present invention relates to the method for improving lathe casting hardness.
Background technology
It is compound for Cu, Cr to improve the common method of lathe gray iron casting hardness, Cu additions are 1-2 times of Cr, the method
Cost is higher.In addition, individually add Cr to improve the hardness of casting, and conventional method, but because Cr chilling tendency is larger, this
When by the control of Cr additions below 0.35% preferably.Cr-Fe fusing point is higher, and conventional 60Cr-Fe fusing point is 1500
DEG C or so, it can not reliably melt, can only be added in stove in casting ladle, it is inconvenient.
Application publication number CN101618453 discloses a kind of cast-infiltration method for improving casting hardness and anti-wear performance, technique
Step is preparation composite coating；By the composite coating of preparation coated on evaporative pattern or sand mo(u)ld, corresponding casting needs to improve hardness
With the setting position of anti-wear performance, compound material coating is formed；By known conventional method after matched moulds, cast；Casting depanning
Afterwards, compound material coating position is quenched and temper；It is by by percentage to the quality to be characterized by described compound material
After diamond nano powder or ceramic nano powder for 65-70% mix with 35-30% polyvinyl alcohol condensation product plus water is tuned into paste
Shape material, the setting section coated in evaporative pattern or mould, coat 3-4 times, reach setting thickness.This method is due to using nanogold
Emery can increase substantially the hardness and anti-wear performance at casting setting position, but can only locally improve hardness, it is impossible to overall
Improve the hardness of whole casting.
The content of the invention
To solve the problems, such as that lathe gray iron casting hardness is low existing for prior art, the present invention provides a kind of for improving machine
The method of bed casting hardness.
In order to solve the above-mentioned technical problem, the invention provides following technical scheme：
A kind of method for improving lathe casting hardness of the invention, steel scrap, foundry return, the new pig iron are put into electric furnace and carried out
Melting, 1400-1600 DEG C is arranged on by furnace temperature, then adds inovulant 75Si-Fe, pregnant amount 0.3-0.7%, is made molten
Liquid A, liquation A is poured into casting die out of casting die sprue cup.
Further, the weight part ratio of selected raw material is steel scrap 70%, foundry return 20%, the new pig iron 10%.
Further, before liquation A is poured into the sprue cup of casting die, Sb is placed at the sprue cup of casting die
Powder, Sb of the proportioning for 0.01-0.05% is added, liquation A is then poured into casting die out of casting die sprue cup
When, the fusion of Sb powder is poured casting die by liquation A.
Further, when liquation A is also in electric furnace, 0.1-0.5% Cr is added.
Further, the circuit temperature is arranged to 1510 DEG C.
Further, 0.05-0.06% inovulant Si-Ba is added in the sprue cup of casting die, liquation A is placed into 3-
After 20min, when pouring into casting die out of casting die sprue cup, inovulant Si-Ba fusions are poured casting by liquation A
Mould.
75Si-Fe, the content for representing silicon in Antaciron are 75%.Pregnant amount 0.5-0.6%, represent pregnant in one ton of molten iron
The content for educating agent is 5kg-6kg.
Compared with prior art, the present invention has the advantages that：Because Sb can influence γ → α
-Fe+Fe3C and Fe3The dynamic conditions of C → α-Fe+G transformations, carbon atom diffusion is hindered, is added in gray iron micro
Antimony Sb, it is possible to strongly facilitate and stabilizing pearlite, improve the hardness of matrix, improve the performance of casting.Sb, element antimony, its
Density is 6.6g/cm3, 630 DEG C of fusing point, boiling point is 1587 DEG C, can be applied directly to when tapping a blast furnace in casting die, it is necessary to how many
With how many, Melting control is more convenient.Further, since Sb addition is seldom economically and very worthwhile.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, with reference to
Embodiment, the present invention is expanded on further.
A kind of method for improving lathe casting hardness of the invention,
Specific embodiment 1：The steel scrap 70% of following parts by weight, foundry return 20%, the new pig iron 10% are put into electric furnace to carry out
Melting, 1400 DEG C are arranged on by furnace temperature, are then added inovulant 75Si-Fe, pregnant amount 0.3%, liquation A are made, will be molten
Liquid A is poured into casting die out of casting die sprue cup.
Before liquation A is poured into the sprue cup of casting die, Sb powder is placed at the sprue cup of casting die, is added
The Sb for 0.01% is matched, when liquation A then is poured into casting die out of casting die sprue cup, liquation A is by Sb
Casting die is poured in powder fusion.When liquation A is also in electric furnace, 0.1% Cr is added.
In the sprue cup of casting die plus 0.05% inovulant Si-Ba, after liquation A is placed into 3min, from pouring mold
When pouring into casting die in the sprue cup of tool, inovulant Si-Ba fusions are poured casting die by liquation A.
Specific embodiment 2：Difference with specific embodiment 1 is：Furnace temperature is arranged on 1600 DEG C, then added pregnant
Agent 75Si-Fe is educated, pregnant amount 0.7%, liquation A is made, liquation A is poured into casting die out of casting die sprue cup.
Proportioning is added as 0.02% Sb, adds 0.5% Cr.
In the sprue cup of casting die plus 0.05% inovulant Si-Ba, after liquation A is placed into 20min, from pouring mold
When pouring into casting die in the sprue cup of tool, inovulant Si-Ba fusions are poured casting die by liquation A.
Specific embodiment 3：Difference with specific embodiment 1 is：Furnace temperature is arranged on 1510 DEG C, then added pregnant
Agent 75Si-Fe is educated, pregnant amount 0.6%, liquation A is made, liquation A is poured into casting die out of casting die sprue cup.
Proportioning is added as 0.03% Sb, adds 0.3% Cr.
In the sprue cup of casting die plus 0.06% inovulant Si-Ba, after liquation A is placed into 20min, from pouring mold
When pouring into casting die in the sprue cup of tool, inovulant Si-Ba fusions are poured casting die by liquation A.
Specific embodiment 4：Difference with specific embodiment 1 is：Furnace temperature is arranged on 1550 DEG C, then added pregnant
Agent 75Si-Fe is educated, pregnant amount 0.5%, liquation A is made, liquation A is poured into casting die out of casting die sprue cup.
Proportioning is added as 0.04% Sb, adds 0.35% Cr.
In the sprue cup of casting die plus 0.05% inovulant Si-Ba, after liquation A is placed into 15min, from pouring mold
When pouring into casting die in the sprue cup of tool, inovulant Si-Ba fusions are poured casting die by liquation A.
Specific embodiment 4：Difference with specific embodiment 1 is：Furnace temperature is arranged on 1550 DEG C, then added pregnant
Agent 75Si-Fe is educated, pregnant amount 0.5%, liquation A is made, liquation A is poured into casting die out of casting die sprue cup.
Proportioning is added as 0.05% Sb, is added without Cr.
In the sprue cup of casting die plus 0.05% inovulant Si-Ba, after liquation A is placed into 15min, from pouring mold
When pouring into casting die in the sprue cup of tool, inovulant Si-Ba fusions are poured casting die by liquation A.
Take a few block casting parts to be tested, step bar hardness test face is machined and removes 7-8mm, then uses Switzerland
ERNST paddle type mills hardometer tests hardness, by 3 points of hardness tested respectively at different ladders of pouring position upper, middle and lower, makes even
.Tested using ERNST portable hardometers, ERNST hardometer test values are more stable, although limited precision, can see
Go out the hardness of tendentiousness test step bar.
Result of the test and analysis
The step bar performance of table 1.
From the point of view of chill block spoken parts in traditional operas, when only stokehold is bred, when Sb additions are 0.04%, spoken parts in traditional operas ratio adds 0.37%
Cr is bigger, but when there is Si-Ba inovulant instant inoculations, when Sb addition is less than 0.05%, adds and be not added with Sb, is tried for triangle
The spoken parts in traditional operas size of block is substantially without influence.
From attached castingFrom the point of view of the metallographic of coupon, the coupon of non-adduction gold has net carbide in 1/2d, and distribution is relatively
Concentrate, carbide total number there are about 8% or so, add that carbide in Sb coupon is less, and total number is about 3%, in fritter
Shape is uniformly distributed, and form is relatively preferable, and carbide morphology and quantity are similar with coupon containing Sb in Cr0.37% coupon,
During the compound addition of Cr0.37%, 0.02%Sb, carbide quantity is increased slightly, and total amount is about 3-5%, in small block uniform, shape
State is fair.Although there is a certain amount of carbide in each attached test bar, in the attached casting hardness of step bar body 30mm sections
In test block, the carbide being clearly present is showed no, under similarity condition, after adding antimony, the amount of the carbide in gray iron matrix does not have
There is increase, appropriate antimony, no chilling tendency are added in gray iron.
Add appropriate Sb, without obvious chilling tendency, can effectively stablize the either pearlite occurred at thick and large section, promote generation piece
Shape pearlite, so as to improve the hardness of casting, Sb addition is more preferable in 0.02-0.03%, effect.
When individually adding Cr 0.35% or so, carbide, Cr and Sb compound tenses are not significantly increased,Carbide in coupon
It is increased slightly, but casting hardness substantially increases, and sensitivity profile is also good.When having special hardness requirement, Cr, Sb are compound to be also
A kind of selection well.
It should be noted that the present invention is a kind of method for improving lathe casting hardness, because Sb can influence γ
→α-Fe+Fe3C and Fe3The dynamic conditions of C → α-Fe+G transformations, carbon atom diffusion is hindered, micro-antimony Sb is added in gray iron,
Can strongly facilitates and stabilizing pearlite, improves the hardness of matrix, improves the performance of casting.Further, since Sb addition
It is seldom economically and very worthwhile.So the present invention effectively overcomes various shortcoming of the prior art and has height
Industrial utilization.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
- A kind of 1. method for improving lathe casting hardness, it is characterised in that steel scrap, foundry return, the new pig iron are put into electric furnace Melted, furnace temperature is arranged on 1400-1600 DEG C, then added and breed 75Si-Fe, pregnant amount 0.3-0.7%, be made Liquation A, liquation A is poured into casting die out of casting die sprue cup.
- A kind of 2. method for improving lathe casting hardness according to claim 1, it is characterised in that selected original The weight part ratio of material is steel scrap 70%, foundry return 20%, the new pig iron 10%.
- 3. a kind of method for improving lathe casting hardness according to claim 2, it is characterised in that fallen in liquation A Before entering in the sprue cup of casting die, Sb powder is placed at the sprue cup of casting die, it is 0.01-0.05% to add proportioning Sb, when liquation A then is poured into casting die out of casting die sprue cup, liquation A by Sb powder fusion pour Casting die.
- 4. a kind of method for improving lathe casting hardness according to claim 3, it is characterised in that liquation A also exists When in electric furnace, 0.1-0.5% Cr is added.
- A kind of 5. method for improving lathe casting hardness according to claim 1, it is characterised in that the circuit temperature Degree is arranged to 1510 DEG C.
- 6. a kind of method for improving lathe casting hardness according to any one claim of Claims 1-4, it is special Sign is, 0.05-0.06% inovulant Si-Ba is added in the sprue cup of casting die, after liquation A is placed into 3-20min, from When pouring into casting die in the sprue cup of casting die, inovulant Si-Ba fusions are poured casting die by liquation A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710862576.2A CN107604236A (en) | 2017-09-21 | 2017-09-21 | A kind of method for improving lathe casting hardness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710862576.2A CN107604236A (en) | 2017-09-21 | 2017-09-21 | A kind of method for improving lathe casting hardness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107604236A true CN107604236A (en) | 2018-01-19 |
Family
ID=61061559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710862576.2A Pending CN107604236A (en) | 2017-09-21 | 2017-09-21 | A kind of method for improving lathe casting hardness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107604236A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508792A (en) * | 2019-09-12 | 2019-11-29 | 齐齐哈尔重型铸造有限责任公司 | A kind of casting method of the more material casting of lathe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886209A (en) * | 2009-05-15 | 2010-11-17 | 西峡县西泵特种铸造有限公司 | Medium silicon-molybdenum vermicular iron material |
| CN103602880A (en) * | 2013-12-04 | 2014-02-26 | 海安县万力铸造有限公司 | As-cast condition production method of high strength and toughness QT850-5 crankshaft |
| CN104451348A (en) * | 2014-12-11 | 2015-03-25 | 湖南科技大学 | Preparation method of high-hardness and high-strength expanding pyramid of mechanical expanding mill |
| CN105200305A (en) * | 2015-09-15 | 2015-12-30 | 浙江杭机铸造有限公司 | Gray cast iron and preparation method thereof |
-
2017
- 2017-09-21 CN CN201710862576.2A patent/CN107604236A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886209A (en) * | 2009-05-15 | 2010-11-17 | 西峡县西泵特种铸造有限公司 | Medium silicon-molybdenum vermicular iron material |
| CN103602880A (en) * | 2013-12-04 | 2014-02-26 | 海安县万力铸造有限公司 | As-cast condition production method of high strength and toughness QT850-5 crankshaft |
| CN104451348A (en) * | 2014-12-11 | 2015-03-25 | 湖南科技大学 | Preparation method of high-hardness and high-strength expanding pyramid of mechanical expanding mill |
| CN105200305A (en) * | 2015-09-15 | 2015-12-30 | 浙江杭机铸造有限公司 | Gray cast iron and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508792A (en) * | 2019-09-12 | 2019-11-29 | 齐齐哈尔重型铸造有限责任公司 | A kind of casting method of the more material casting of lathe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Beeley | Foundry technology | |
| CN101928872B (en) | Production method of low-magnetic iron castings | |
| CN103469109A (en) | Roughing roll made of graphitizable steel material and manufacturing method thereof | |
| CN103320651A (en) | Fine-grained zinc-based alloy for die and preparation process thereof | |
| CN106367671A (en) | Nodular cast iron edging roll suitable for universal rolling mill and manufacturing method thereof | |
| CN105964912A (en) | Crankshaft casting technology | |
| Pio et al. | Grain refinement of LM6 Al–Si alloy sand castings to enhance mechanical properties | |
| CN105624571A (en) | Super-thick steel plate and production technology thereof | |
| Li et al. | Elimination Mechanism of Shrinkage Porosity During Pressurized Solidification Process of 19Cr14Mn4Mo1N High-Nitrogen Steel Ingot | |
| Herfurth et al. | Casting | |
| CN107604236A (en) | A kind of method for improving lathe casting hardness | |
| CASTING | The effect of sand casting process parameters on mechanical properties of aluminum alloy casting | |
| Álvarez et al. | Analysis of the influence of chemical composition on the mechanical and metallurgical properties of engine cylinder blocks in grey cast iron | |
| JPS6125454B2 (en) | ||
| CN109702175B (en) | Preparation method of roller and roller | |
| US3998623A (en) | Method of producing alloys containing titanium carbide | |
| CN107321920A (en) | A kind of pouring procedure cast for precision castings | |
| US2185464A (en) | Alumino-thermic mix for making permanent magnets | |
| Zhi et al. | Casting process optimization of a bimetal wear-resistant block using liquid–solid processing | |
| RU2605017C1 (en) | Method of producing cast dispersion-hardening ferrite-carbide steel | |
| Santhi et al. | Design of gating and riser system for grate bar casting | |
| CN103388104B (en) | A kind of refractory alloy and preparation method thereof | |
| CN108660362A (en) | A kind of Green foundry method and device of high-strength ductile cast iron | |
| Green-Spikesley | Investment casting | |
| Pustovalov et al. | Manufacturing Scheme of Spherical Grinding Bodies from Abrasion-Resistant Cast Iron Free of Shrinkage Defects |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180119 |