CN108220869A - A kind of carburization process of excavator bucket teeth - Google Patents
A kind of carburization process of excavator bucket teeth Download PDFInfo
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- CN108220869A CN108220869A CN201611163839.2A CN201611163839A CN108220869A CN 108220869 A CN108220869 A CN 108220869A CN 201611163839 A CN201611163839 A CN 201611163839A CN 108220869 A CN108220869 A CN 108220869A
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- China
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- casting
- mold
- sand mold
- carbon
- catalyst
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/18—Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of carburization process of excavator bucket teeth, are characterized in that：Include the following steps：Catalyst and carbon are added in sand mold；Casting cast in casting mold completion when, casting mold by molten steel energy storage heat；The catalyst in sand mold in casting mold begins to decompose into oxidizing gas after being heated；Carbon is oxidized to CO gases in oxidizing atmosphere, and gas is become separated in flight everywhere in sand mold；Due to the solidification shrinkage of casting, void layer is formed between casting and casting mold, CO gases are just accumulated in this gap so that casting and carbon come into full contact with；CO is encountered in casting of the temperature for 400 700 DEG C of states, back reaction is generated again, reaction product C is contacted with being in the casting of austenite structure, it will soon be dissolved wherein, then it is migrated to the deeper place of casting, the phosphorus content of bucket tooth can be played, so as to play the service life of lifting means, realizes the raising of production efficiency and the technique effect that production cost reduces.
Description
Technical field
The present invention relates to a kind of carburization process of excavator bucket teeth.
Background technology
Anti-friction material is the essential extraordinary goods and materials of nation-building, it is widely used in capital construction, mining, cement manufacture, fire
The industries such as electricity.According to authoritative statistics, 30,000,000 tons of anti-friction material of China's consumption in 2013, wherein bucket tooth account for about 1/3rd left sides
The right side, so researching and developing more perfect, the more wear-resistant material of comprehensive performance has very high economic benefit and bright prospects, Wo Mensuo
Known bucket tooth, military service operating mode very severe, wear-resistant to material and impact resistance requirement is very harsh, since bucket tooth exists
It under working condition, mutually rubs, collide with hard sand material all day long, not only deterioration is very big, and runs into hard rock
Stone, impact force is also very large, so must also to have higher impact concurrently while must have higher hardness tough for bucket tooth
Property, so research and develop a kind of anti-friction material, the service life of lifting means, the raising and production cost reduction for realizing production efficiency be
Necessary.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of phosphorus content for promoting bucket tooth.
To achieve the above object, the present invention provides following technical solutions：A kind of carburization process of excavator bucket teeth, including
Following steps：(1) catalyst and carbon are added in sand mold；(2) casting cast in casting mold completion when, casting mold is by molten steel
Energy storage heating；(3) catalyst in the sand mold in casting mold begins to decompose into oxidizing gas after being heated；(4) carbon is in oxygen
CO gases are oxidized to, and gas is become separated in flight everywhere in sand mold in the property changed atmosphere；(5) due to the solidification shrinkage of casting, in casting and
Void layer is formed between casting mold, CO gases are just accumulated in this gap so that casting and carbon come into full contact with；(6)CO
It encounters in casting of the temperature for 400-700 DEG C of state, and generates back reaction, reaction product C is with being in austenite structure
Casting contacts, and will soon be dissolved wherein, is then migrated to the deeper place of casting.
Preferably, being equipped with flame-retardant coating layer between the sand mold and casting, the refractory coating is attached on sand mold, CO
Gas enters the void layer between casting and casting mold by flame-retardant coating layer.
Preferably, the refractory coating is zirconium English powder and industrial alcohol, wherein the proportioning of zirconium English powder and industrial alcohol is 1
∶1。
Preferably, institute's catalyst is MCO3, M represents metallic element.
The beneficial effects of the invention are as follows：Add certain carbon materials and catalyst in molding sand, the carbon in molding sand
Be transported to after gasification on the interface of casting mold and casting, cast(ing) surface absorbs, and in solubility difference, C from surface internally
Migration, flame-retardant coating layer be it is increased in order to increase the refractoriness of casting mold and extend defeated and dispersed out-of-service time of casting mold, can
Cause nearly cast(ing) surface, phosphorus content is higher, and so as to improve the anti-wear effect of bucket tooth, the service life of lifting means is realized
The raising of production efficiency and the reduction of production cost.
Description of the drawings
Fig. 1 is casting carburizing schematic diagram of the present invention.
In figure：1st, casting；2nd, void layer；3rd, flame-retardant coating layer；4th, sand mold.
Specific embodiment
With reference to the carburization process of Fig. 1, present case a kind of excavator bucket teeth implemented, include the following steps：(1) by catalyst
It is added in sand mold 4 with carbon；(2) casting 1 cast in casting mold completion when, casting mold by molten steel energy storage heat；(3) casting mold
Catalyst in interior sand mold 4 begins to decompose into oxidizing gas after being heated；(4) carbon is oxidized in oxidizing atmosphere
CO gases, and gas is become separated in flight everywhere in sand mold 4；(5) due to the solidification shrinkage of casting 1, gap is formed between casting 1 and casting mold
Layer 2, CO gases are just accumulated in this gap so that casting 1 and carbon come into full contact with；(6) CO is encountered is in temperature
The casting 1 of 400-700 DEG C of state, and back reaction is generated, reaction product C is contacted with being in the casting 1 of austenite structure, quickly
It will be dissolved wherein, then be migrated to the deeper place of casting 1；
Flame-retardant coating layer 3 is equipped between the sand mold 4 and casting 1, the refractory coating is attached on sand mold 4, CO gases
Void layer 2 between casting 1 and casting mold is entered by flame-retardant coating layer 3, the refractory coating is zirconium English powder and industrial alcohol,
Wherein the proportioning of zirconium English powder and industrial alcohol is 1: 1, and institute's catalyst is MCO3, M represents metallic element.
MCO3 generates MO and CO after being heated2, CO2CO is generated after being heated with C.
In model 6Y3552-1 bucket tooths, 1 weight 49.2kg of casting, chemical composition：C2~2.5%, Cr5~6.5%, Ni2
~3%, Mn 0.5~0.7%, Si 0.6~0.8%, P≤0.03%, S≤0.02%, surplus Fe, smelting temperature：1640-
1660 DEG C, 1 ton of quick intermediate frequency furnace melting, pouring temperature：1540-1560 DEG C, 2 hours knockouts after cast, 1 temperature of casting during knockout
Degree is (right using the cold-box casting mold (experimental group) added with carbon element and traditional waterglass precise casting mould shell at 650 DEG C or so
According to group) two groups using same stove molten steel, respectively pour into a mould 6 casting 1 and tested, to prevent in the pass of casting process surrounding time difference
System, the accuracy that the differentia influence of chemical composition is caused to test, using same Baogang's water, experimental group and control group control group respectively pour
The method of note one case is poured into a mould, after we are cooled down from the most thick position of casting 1 with wire cutting testing casting 1 after casting 1 cools down
We are taken from the most thick position of casting 1 with wire cutting after we are cooled down from the most thick position of casting 1 with wire cutting testing casting 1
Sample.
Using the method for grinding after sampling, successively chemically examined from outside to inside with spectrometer, analysis result is listed in Tables 1 and 2.
Table 1, the variation of 1 phosphorus content of test group casting
Table table 2, the variation of 1 phosphorus content of control group casting
The phosphorus content that can be seen that 1 center from surface to casting of casting 1 of experimental group from the data listed by table is exponentially bent
Line declines, to 3mm depth after phosphorus content substantially close to the phosphorus content in raw steel water, closer to 1 surface of casting, phosphorus content is got over
Height reaches 0.7%, and carburizing depth reaches 3mm, and carburetting effect is clearly.
And the chemical composition of control group, 2 are shown in Table, is not changed substantially from 1 surface of casting to 1 center phosphorus content of casting, is connect
The phosphorus content of nearly raw steel water, case carbon is in a slight decrease, the reason is that precision castings 1 have oxidation decarburization phenomenon in cooling procedure,
Although this phenomenon is with requiring just on the contrary, slight and undesirable.
With bench mounted hardness tester, preceding Brinell hardness tester is heat-treated, 3 are shown in Table with Luo Shi hardometers, measurement result after heat treatment.
Table 3
Data analysis：The case hardness of casting 1 under as cast condition, test group is more high than control group, illustrates that 1 carburizing of casting is imitated
Fruit plays the role of being remarkably reinforced to hardness.
Here there is a phenomenon, chemically seen on ingredient, the depth of carburizing is in 3mm or so, and hardness number is in the place of 5mm
Higher than control group, it is not the effect of carburetting effect to think this, but with cold box molding technique, molding sand collapsibility is good, opens
Casting 1 is still just exposed in air in higher temperature after case, and cooling is fast so hardness is high.And control group is water glass type
Shell shell when temperature is higher is not easily to fall off, firmly coated on 1 surface of casting, influences cooling velocity, so hardness is relatively low.
Embodiment described above is a kind of preferable scheme of the present invention, and not the present invention is made in any form
Limitation also has other variants and remodeling under the premise of without departing from the technical solution recorded in claim.
Claims (4)
1. a kind of carburization process of excavator bucket teeth, it is characterised in that：Include the following steps：
（1）Catalyst and carbon are added in sand mold；
（2）Casting cast in casting mold completion when, casting mold by molten steel energy storage heat；
（3）The catalyst in sand mold in casting mold begins to decompose into oxidizing gas after being heated；
（4）Carbon is oxidized to CO gases in oxidizing atmosphere, and gas is become separated in flight everywhere in sand mold；
（5）Due to the solidification shrinkage of casting, void layer is formed between casting and casting mold, CO gases just accumulate in this gap
In so that casting and carbon come into full contact with；
（6）CO is encountered in casting of the temperature for 400-700 DEG C of state, and generates back reaction, and reaction product C is with being in
The casting contact of austenite structure, will soon be dissolved wherein, then be migrated to the deeper place of casting.
2. a kind of carburization process of excavator bucket teeth according to claim 1, it is characterised in that：The sand mold and casting it
Between be equipped with flame-retardant coating layer, the refractory coating is attached on sand mold, and CO gases enter casting and casting by flame-retardant coating layer
Void layer between type.
3. a kind of carburization process of excavator bucket teeth according to claim 2, it is characterised in that：The refractory coating is zirconium
English powder and industrial alcohol, the wherein proportioning of zirconium English powder and industrial alcohol are 1:1.
4. a kind of carburization process of excavator bucket teeth according to claim 1 or 2, it is characterised in that：The catalyst is
MCO3, M represents metallic element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611163839.2A CN108220869A (en) | 2016-12-15 | 2016-12-15 | A kind of carburization process of excavator bucket teeth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611163839.2A CN108220869A (en) | 2016-12-15 | 2016-12-15 | A kind of carburization process of excavator bucket teeth |
Publications (1)
| Publication Number | Publication Date |
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| CN108220869A true CN108220869A (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611163839.2A Pending CN108220869A (en) | 2016-12-15 | 2016-12-15 | A kind of carburization process of excavator bucket teeth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041360A (en) * | 2019-12-16 | 2020-04-21 | 宁国市铸丰钢球铸造有限公司 | Wear-resistant hammer head and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274923A (en) * | 2011-08-04 | 2011-12-14 | 广东新劲刚超硬材料有限公司 | Method for in situ synthesis of tungsten carbide-based hard alloy coating on surface of cast |
| CN103008528A (en) * | 2012-11-09 | 2013-04-03 | 兰州兰石铸造有限责任公司 | Simple alcohol-based casting coating and preparation method thereof |
| CN103537649A (en) * | 2012-10-29 | 2014-01-29 | 洛阳希诺能源科技有限公司 | Composite casting technology of excavator bucket teeth |
-
2016
- 2016-12-15 CN CN201611163839.2A patent/CN108220869A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274923A (en) * | 2011-08-04 | 2011-12-14 | 广东新劲刚超硬材料有限公司 | Method for in situ synthesis of tungsten carbide-based hard alloy coating on surface of cast |
| CN103537649A (en) * | 2012-10-29 | 2014-01-29 | 洛阳希诺能源科技有限公司 | Composite casting technology of excavator bucket teeth |
| CN103008528A (en) * | 2012-11-09 | 2013-04-03 | 兰州兰石铸造有限责任公司 | Simple alcohol-based casting coating and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 余江龙等: "在铸造过程中实施渗碳的效果及机理", 《铸造技术》 * |
| 唐玉林: "《圣泉铸工手册》", 31 March 2006, 东北大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041360A (en) * | 2019-12-16 | 2020-04-21 | 宁国市铸丰钢球铸造有限公司 | Wear-resistant hammer head and manufacturing method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 310000 Lu Tong Village, Dayang Town, Jiande City, Hangzhou, Zhejiang Applicant after: Hangzhou Guan Nan wear-resistant material Co., Ltd. Address before: 311600 Lu Tong Village, Dayang Town, Jiande City, Hangzhou, Zhejiang Applicant before: Hangzhou crown Precision Casting Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180629 |