CN109226677A - A kind of sand mold casting mold and the method for preparing bucket tooth toothholder using the sand mold casting mold - Google Patents
A kind of sand mold casting mold and the method for preparing bucket tooth toothholder using the sand mold casting mold Download PDFInfo
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- CN109226677A CN109226677A CN201811157877.6A CN201811157877A CN109226677A CN 109226677 A CN109226677 A CN 109226677A CN 201811157877 A CN201811157877 A CN 201811157877A CN 109226677 A CN109226677 A CN 109226677A
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- casting mold
- sand mold
- mold casting
- sand
- mold
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- 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
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to a kind of sand mold casting mold and the methods for preparing bucket tooth toothholder using the sand mold casting mold, belong to field of mechanical technique.Sand mold casting mold of the invention is made of one layer of decorative layer that matrix and base inner surface coat, and includes the α-Al that particle diameter distribution is 20nm-50nm in the component of the decorative layer2O3.Sand mold casting mold of the invention is capable of providing molten metal with good fluidity, reduction cast product surface layer defect, can effectively improve its mechanical property using the casting mould bucket tooth toothholder.
Description
Technical field
The invention belongs to field of mechanical technique, it is related to a kind of sand mold casting mold and utilizes sand mold casting mold preparation bucket
The method of tooth toothholder.
Background technique
Excavator bucket teeth is that the important easy consumption component on excavator is made of similar to the tooth of people toothholder and tooth tip
Dipper Teeth, the two by pin shaft connect.Excavator bucket teeth is during mine excavation, geological prospecting and infrastructure, directly
It is contacted with ground, ore etc., is subjected to the fretting wear of ground, ore etc., but also certain shock loading can be born, because
This it at excavator most vulnerable part, the every annual meeting of every excavator consumes a large amount of bucket tooth accessory.Bucket tooth toothholder is to excavate
Important component in machine, it is the important component for connecting bucket tooth and scraper bowl, and bucket tooth toothholder is arranged on the bottom plate of power shovel,
The use of bucket tooth toothholder can reduce the damage to bottom plate, so that most of abrasion in excavating concentrates on bucket tooth, reduce
The cost depletions of excavator.Toothholder requires have higher toughness and hardness, while to have good weldability, to guarantee that weld bond is strong
The reliability of degree and welding.The toothholder service life in the prior art is very short, it is easy to fracture or crackle occur, the reason is that tooth
Seat weldability and wear no resistance, impact flexibility and tensile strength are relatively low.
Toothholder generally uses cast iron or steel alloy to be made, and in order to guarantee the toughness and hardness of toothholder, needs to have in cast iron
Higher carbon content and alloy content, however higher carbon content and alloy content are then difficult to ensure preferable welding performance, together
When also result in molten hot metal in casting process mobility reduce, casting is also easy to produce shrinkage defect, and is difficult to obtain consistency
The product high, shape is complete, mechanical property is good.In actual production, in order to improve the mobility of molten iron, often using improving temperature
The method of degree, however when using excessively high temperature casting, sand mold swell can be caused, rate of wasted casting product greatly improves, and also improves
Manufacturing cost.
Summary of the invention
The purpose of the present invention is in view of the above-mentioned problems existing in the prior art, propose a kind of good permeability, be capable of providing
Molten metal is with the sand mold casting mold of good fluidity, reduction cast product surface layer defect.
Object of the invention can be realized by the following technical scheme:
A kind of sand mold casting mold, one layer of decorative layer group that the sand mold casting mold is coated by matrix and base inner surface
At the α-Al for being 20nm-50nm including particle diameter distribution in the component of the decorative layer2O3。
The present invention has nanometer α-Al by forming one layer in quartz sand surface2O3Decorative layer, and control a nanometer α-
Al2O3Size, due to nanometer α-Al2O3Specific structure and property, so that sand mold mould surface has specific superficiality
Can, it can effectively reduce the surface tension of die surface, when molten metal and die surface contact, due to molten metal surface layer and mold
The surface tension difference on surface is larger, can reduce the interfacial tension of molten metal and die surface, to improve molten metal in sand mold
The intracavitary mobility of type, and slow down the time of molten metal conjunctiva after contacting sand mold mould, make the gas formed under molten metal surface layer
Bubble having time also is easier to be precipitated because of surface tension difference, to reduce the generation of casting subcutaneous blowhole, and then casting can be improved
The mechanical property of part.
Preferably, the decorative layer is coated in after sand mold casting mold inner surface by decorating liquid heats shape through laser scanning
At.
Preferably, the preparation method of the decorating liquid is, prepare raw material according to following components and its weight percent:
Al(NO3)31.5%-3.8%,
Aqueous acrylic emulsion 2.3%-4.0%,
Polyacrylate 7.6%-9.5%,
Surplus is water,
Above-mentioned raw materials are mixed, NaOH solution is added and is adjusted to pH value for 7.5-8.0, up to decorating liquid after stir process.
Preferably, further including the kaolin for having mass percent for 2.0%-5.0% in the raw material of the decorating liquid.
The present invention is added in decorating liquid appropriate kaolin, and since its large specific surface area, surface energy are low, shrinking percentage is big,
It can promote decorative layer and form small duct, avoid because only containing α-Al2O3It easily forms excessively fine and close decorative layer and easily causes mould gas
Hole path blocks and reduces mold gas permeability.
Preferably, the scan power of the laser scanning is 1.5kw-2.0kw, scanning speed 150mm/min-
200mm/min, spot size are 5.0mm × 4.5mm.
The present invention is in Al (NO3)3NaOH solution is added after in solution, generates Al (OH)3, Al (OH)3In the height of laser scanning surface
Under temperature effect, Al is generated2O3。
Al (NO in solution3)3Concentration will affect the Al (OH) of generation3Size, and then influence to generate Al2O3Size.And
Scan power, scanning speed, the spot size of laser scanning surface are to influence Al2O3An important factor for generating quality, laser scanning power
Too small or scanning speed is excessive, will cause amount of localized heat deficiency, is not enough to generate α-Al2O3, laser scanning power it is excessive or
Scanning speed is too small, can locally generate excessive heat, cause decorative layer overfire, scaling loss is big, and die surface is coarse, influences
Molten metal flowing.Scan power, scanning speed, spot size size also will have a direct impact on Al2O3The property such as the speed of growth, size
Can, the present invention passes through control Al (NO3)3Content and Laser Scanning Parameters in slurries will generate α-Al2O3Size Control exist
Between 20nm-50nm.
Preferably, the sand mold casting mold matrix is by including that the raw material of following parts by weight is made:
The present invention can utilize its special sheet-pile shape, pencil by adding appropriate wollastonite in conventional sand mold raw material
Or the structures such as radial form the hole of small stable in sand mold casting mold with quartz sand, to increase the ventilative of mold
Property.And the intensity of mold and heat-resisting, the corrosion-resistant and weatherability of toughness and mold also can be improved.On the other hand can have
Effect reduce mold thermal expansion shrinking percentage, reduce the hygro-expansivity of mold, prevent in use mold by molten metal
Cracking, which occurs, for high temperature influences cast properties.
Another object of the present invention is to provide a kind of method for preparing bucket tooth toothholder using above-mentioned sand mold casting mold, institutes
State preparation method the following steps are included:
It is molten metal by the component raw material heating melting of steel alloy, by pouring metal melt to such as any power of claim 1-6
Benefit requires to form green compact after standing in the sand mold casting mold, be heat-treated green compact, obtain bucket tooth toothholder.
Preferably, the temperature that the component raw material heating melting of the steel alloy is molten metal is 1430 DEG C -1460 DEG C.
Preferably, the temperature of the pouring metal melt is 1310 DEG C -1340 DEG C,
Preferably, it is described heat treatment for by manufactured green compact with the speed fast cooling of 8 DEG C/min-12 DEG C/min extremely
920 DEG C of -960 DEG C of heat preservation 2h-3h keep the temperature 3h- then with the speed slow cooling of 5 DEG C/min-6 DEG C/min to 490 DEG C -530 DEG C
5h is finally cooled to 250 DEG C of -300 DEG C of heat preservation 3-4h.
Elder generation's fast cooling to high-temperature region is kept the temperature when the present invention is heat-treated, and then slow cooling to middle warm area is kept the temperature, finally again
The isothermal holding at low temperature is conducive to the refinement of the refinement especially carbide of crystal grain in steel alloy, avoids crystallite dimension excessive,
The toughness of final products is influenced, while being conducive to the abundant release generated with stress of crystal, reduces steel alloy internal stress, from
And reduce deformation.
Compared with prior art, the invention has the following advantages: sand mold casting mold surface can provide molten metal with
Preferable mobile performance and good molten metal surface layer gas escape effect, thus the bucket prepared using the sand mold casting mold
Tooth toothholder reduces casting flaw, improves mechanical property.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention will be further described, but the present invention is simultaneously
It is not limited to these embodiments.
Embodiment 1-3 is the embodiment of sand mold casting mold decorative layer.
Embodiment 1
The preparation method of sand mold casting mold decorative layer in the present embodiment the following steps are included:
(1) by weight percentage, by 1.5%Al (NO3)3, 2.0% kaolin, 2.3% aqueous acrylic emulsion,
7.6% polyacrylate and 86.60% water are uniformly mixed, and it is 7.5 that NaOH solution, which is added, and is adjusted to pH value, are obtained after stirring 30min
To decorating liquid；
(2) decorating liquid is coated in sand mold casting mold inner surface, laser scanning heating is carried out to mould inner surface, is formed
Decorative layer, the scan power of laser scanning are 1.5kw, and scanning speed 150mm/min, spot size is 5.0mm × 4.5mm,
α-the Al that particle diameter distribution is 38nm-50nm is formed in decorative layer2O3。
Embodiment 2
The preparation method of sand mold casting mold decorative layer in the present embodiment the following steps are included:
(1) by weight percentage, by 2.6%Al (NO3)3, 3.7% kaolin, 3.0% aqueous acrylic emulsion,
8.3% polyacrylate and 78.90% water are uniformly mixed, and it is 7.8 that NaOH solution, which is added, and is adjusted to pH value, are obtained after stirring 30min
To decorating liquid；
(2) decorating liquid is coated in sand mold casting mold inner surface, laser scanning heating is carried out to mould inner surface, is formed
Decorative layer, the scan power of laser scanning are 1.8kw, and scanning speed 170mm/min, spot size is 5.0mm × 4.5mm,
α-the Al that particle diameter distribution is 33nm-43nm is formed in decorative layer2O3。
Embodiment 3
The preparation method of sand mold casting mold decorative layer in the present embodiment the following steps are included:
(1) by weight percentage, by 3.8%Al (NO3)3, 5.0% kaolin, 4.0% aqueous acrylic emulsion,
9.5% polyacrylate and water are uniformly mixed, and it is 8.0 that NaOH solution, which is added, and is adjusted to pH value, are modified after stirring 30min
Liquid；
(2) decorating liquid is coated in sand mold casting mold inner surface, laser scanning heating is carried out to mould inner surface, is formed
Decorative layer, the scan power of laser scanning are 2.0kw, and scanning speed 200mm/min, spot size is 5.0mm × 4.5mm,
α-the Al that particle diameter distribution is 20nm-35nm is formed in decorative layer2O3。
Embodiment 4-6 is the embodiment of sand mold casting mold matrix.
Sand mold casting mold matrix is made of the raw material of parts by weight as shown in table 1 below in embodiment 4-6:
Table 1: the composition of raw materials of sand mold casting mold matrix in embodiment 4-6
| Embodiment 4 | Embodiment 5 | Embodiment 6 | |
| Quartz sand | 100 parts | 100 parts | 100 parts |
| Wollastonite | 12 parts | 20 parts | 30 parts |
| Calcium bentonite | 4 parts | 5 parts | 6 parts |
| Coal dust | 1 part | 2 parts | 4 parts |
| Water | 6 parts | 7 parts | 9 parts |
Sand mold casting mold matrix in embodiment 4-6 is prepared using conventional sand mold casting mold method.
Embodiment 7-9 is the embodiment of the method for preparing bucket tooth toothholder
Embodiment 7
The method of bucket tooth toothholder is prepared in the present embodiment the following steps are included:
(1) prepare raw material: 0.25%C, 1.6%Si, 0.7%Mn, 1.3%Ni, 0.2% according to following alloy steel constituent
Mo, 0.1%Ti, 0.03%RE, surplus are Fe and inevitable impurity；
(2) component raw material of steel alloy is melted at a temperature of 1430 DEG C as molten metal, by molten metal in 1310 DEG C of temperature
Under be poured into the sand mold casting mold with 5 matrix of 2 decorative layer of embodiment and embodiment, green compact are formed after standing；
(3) by manufactured green compact with the speed fast cooling of 8 DEG C/min to 920 DEG C of heat preservation 3h, then with the speed of 5 DEG C/min
Slow cooling is spent to 490 DEG C, is kept the temperature 5h, is finally cooled to 250 DEG C of heat preservation 4h, is then air-cooled to room temperature, obtains bucket tooth toothholder.
Embodiment 8
The method of bucket tooth toothholder is prepared in the present embodiment the following steps are included:
(1) prepare raw material: 0.25%C, 1.6%Si, 0.7%Mn, 1.3%Ni, 0.2% according to following alloy steel constituent
Mo, 0.1%Ti, 0.03%RE, surplus are Fe and inevitable impurity；
(2) component raw material of steel alloy is melted at a temperature of 1440 DEG C as molten metal, by molten metal in 1330 DEG C of temperature
Under be poured into the sand mold casting mold with 5 matrix of 2 decorative layer of embodiment and embodiment, green compact are formed after standing；
(3) by manufactured green compact with the speed fast cooling of 10 DEG C/min to 950 DEG C of heat preservation 2.5h, then with 5.5 DEG C/
The speed slow cooling of min keeps the temperature 4h, is finally cooled to 280 DEG C of heat preservation 3.5h, is then air-cooled to room temperature, obtains to 500 DEG C
Bucket tooth toothholder.
Embodiment 9
The method of bucket tooth toothholder is prepared in the present embodiment the following steps are included:
(1) prepare raw material: 0.25%C, 1.6%Si, 0.7%Mn, 1.3%Ni, 0.2% according to following alloy steel constituent
Mo, 0.1%Ti, 0.03%RE, surplus are Fe and inevitable impurity；
(2) component raw material of steel alloy is melted at a temperature of 1460 DEG C as molten metal, by molten metal in 1340 DEG C of temperature
Under be poured into the sand mold casting mold with 5 matrix of 2 decorative layer of embodiment and embodiment, green compact are formed after standing；
(3) by manufactured green compact with the speed fast cooling of 12 DEG C/min to 960 DEG C of heat preservation 2h, then with 6 DEG C/min's
Speed slow cooling keeps the temperature 3h, is finally cooled to 300 DEG C of heat preservation 3h, is then air-cooled to room temperature, obtains bucket tooth tooth to 530 DEG C
Seat.
Embodiment 10
Being poured the sand mold casting mold used has the decorative layer of embodiment 1 and the matrix of embodiment 4, other and embodiment
8 is identical.
Embodiment 11
Being poured the sand mold casting mold used has the decorative layer of embodiment 3 and the matrix of embodiment 6, other and embodiment
8 is identical.
Comparative example 1
It is poured the sand mold casting mold used and layer is not decorated, other are same as Example 8.
Comparative example 2
In decorating liquid, Al (NO3)3Weight percent be 4.0%, other are same as Example 8.
Comparative example 3
Kaolin is free of in decorating liquid, other are same as Example 8.
Comparative example 4
The laser scanning power of decorative layer is 1.5kw, other are same as Example 8.
The performance of bucket tooth toothholder obtained in 7-11 of the embodiment of the present invention, comparative example 1-4 is compared, as a result such as following table
Shown in 2.
Table 2: the comparison of cast properties after being heat-treated in embodiment 7-11, comparative example 1-4
In conclusion the present invention is by improving for molding sand casting mould used in bucket tooth toothholder is prepared, in mold
One layer of decorative layer is arranged in inner surface, and reasonable compatibility modifies layer formula, effectively increases the stream of molten metal bath in casting process
Dynamic property, and reduce cast product surface layer defect, while being formulated by reasonable compatibility die matrix, further improve die matrix
Mechanical property and gas permeability keep mold more durable, while improving the mechanical property of bucket tooth toothholder,
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (7)
1. a kind of sand mold casting mold, which is characterized in that the sand mold casting mold coated by matrix and base inner surface one
Layer decorative layer forms, and includes the α-Al that particle diameter distribution is 20nm-50nm in the component of the decorative layer2O3。
2. a kind of sand mold casting mold according to claim 1, which is characterized in that the decorative layer is coated in by decorating liquid
It is thermally formed after sand mold casting mold inner surface through laser scanning.
3. a kind of sand mold casting mold according to claim 2, which is characterized in that the preparation method of the decorating liquid is,
Prepare raw material according to following components and its weight percent:
Al(NO3)31.5%-3.8%,
Aqueous acrylic emulsion 2.3%-4.0%,
Polyacrylate 7.6%-9.5%,
Surplus is water,
Above-mentioned raw materials are mixed, NaOH solution is added and is adjusted to pH value for 7.5-8.0, up to decorating liquid after stir process.
4. a kind of sand mold casting mold according to claim 3, which is characterized in that further include in the raw material of the decorating liquid
Having mass percent is the kaolin of 2.0%-5.0%.
5. a kind of sand mold casting mold according to claim 2, which is characterized in that the scan power of the laser scanning is
1.5kw-2.0kw, scanning speed 150mm/min-200mm/min, spot size are 5.0mm × 4.5mm.
6. a kind of sand mold casting mold according to claim 2, which is characterized in that the sand mold casting mold by include with
The raw material of lower parts by weight is made:
7. a kind of method that the sand mold casting mold using as described in claim 1-6 any claim prepares bucket tooth toothholder,
It is characterized in that, the preparation method comprises the following steps:
It is molten metal by the component raw material heating melting of steel alloy, pouring metal melt is wanted to such as any right of claim 1-6
It asks in the sand mold casting mold, forms green compact after standing, green compact are heat-treated, obtain bucket tooth toothholder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811157877.6A CN109226677B (en) | 2018-09-30 | 2018-09-30 | Sand casting mold and method for preparing bucket tooth holder by using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811157877.6A CN109226677B (en) | 2018-09-30 | 2018-09-30 | Sand casting mold and method for preparing bucket tooth holder by using same |
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| Publication Number | Publication Date |
|---|---|
| CN109226677A true CN109226677A (en) | 2019-01-18 |
| CN109226677B CN109226677B (en) | 2020-06-26 |
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| CN201811157877.6A Expired - Fee Related CN109226677B (en) | 2018-09-30 | 2018-09-30 | Sand casting mold and method for preparing bucket tooth holder by using same |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5091523A (en) * | 1973-12-15 | 1975-07-22 | ||
| JPH04178235A (en) * | 1990-11-09 | 1992-06-25 | Sanyo Chem Ind Ltd | Resin composition for wear resistant pattern for sand mold casting |
| KR20070111738A (en) * | 2006-05-19 | 2007-11-22 | 현대자동차주식회사 | Sand type core manufacturing method for high pressure casting |
| CN103272993A (en) * | 2013-04-16 | 2013-09-04 | 繁昌县恒鑫汽车零部件有限公司 | Molding sand manufactured from quartz sand as main material and manufacturing method thereof |
| KR20180017400A (en) * | 2016-08-09 | 2018-02-21 | 창원대학교 산학협력단 | Method for preparing casting mold with high strength using ternary inorganic binder |
-
2018
- 2018-09-30 CN CN201811157877.6A patent/CN109226677B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5091523A (en) * | 1973-12-15 | 1975-07-22 | ||
| JPH04178235A (en) * | 1990-11-09 | 1992-06-25 | Sanyo Chem Ind Ltd | Resin composition for wear resistant pattern for sand mold casting |
| KR20070111738A (en) * | 2006-05-19 | 2007-11-22 | 현대자동차주식회사 | Sand type core manufacturing method for high pressure casting |
| CN103272993A (en) * | 2013-04-16 | 2013-09-04 | 繁昌县恒鑫汽车零部件有限公司 | Molding sand manufactured from quartz sand as main material and manufacturing method thereof |
| KR20180017400A (en) * | 2016-08-09 | 2018-02-21 | 창원대학교 산학협력단 | Method for preparing casting mold with high strength using ternary inorganic binder |
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| CN109226677B (en) | 2020-06-26 |
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Granted publication date: 20200626 Termination date: 20210930 |