CN108838361A - A kind of casting method of die casting - Google Patents
A kind of casting method of die casting Download PDFInfo
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- CN108838361A CN108838361A CN201811026374.5A CN201811026374A CN108838361A CN 108838361 A CN108838361 A CN 108838361A CN 201811026374 A CN201811026374 A CN 201811026374A CN 108838361 A CN108838361 A CN 108838361A
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- 238000005266 casting Methods 0.000 title claims abstract description 62
- 238000004512 die casting Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 73
- 238000000576 coating method Methods 0.000 claims abstract description 73
- 230000006835 compression Effects 0.000 claims abstract description 45
- 238000007906 compression Methods 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 238000003618 dip coating Methods 0.000 claims abstract description 10
- 239000004615 ingredient Substances 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 101
- 238000002844 melting Methods 0.000 claims description 66
- 230000008018 melting Effects 0.000 claims description 66
- 239000011521 glass Substances 0.000 claims description 59
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 58
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 44
- 229910052863 mullite Inorganic materials 0.000 claims description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 30
- 229910052799 carbon Inorganic materials 0.000 claims description 30
- 239000000395 magnesium oxide Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000008367 deionised water Substances 0.000 claims description 17
- 229910021641 deionized water Inorganic materials 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 13
- 239000011777 magnesium Substances 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 238000002242 deionisation method Methods 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 22
- 239000000463 material Substances 0.000 description 13
- 235000019353 potassium silicate Nutrition 0.000 description 13
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 13
- 239000011268 mixed slurry Substances 0.000 description 12
- 229940100486 rice starch Drugs 0.000 description 12
- 235000013312 flour Nutrition 0.000 description 11
- 239000011812 mixed powder Substances 0.000 description 7
- 238000010792 warming Methods 0.000 description 7
- 229920002472 Starch Polymers 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 6
- 238000010422 painting Methods 0.000 description 6
- 239000008107 starch Substances 0.000 description 6
- 235000019698 starch Nutrition 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000001354 calcination Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003110 molding sand Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- -1 silica boron metalloid salt Chemical class 0.000 description 2
- 229920002261 Corn starch Polymers 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000017020 Ipomoea batatas Species 0.000 description 1
- 235000002678 Ipomoea batatas Nutrition 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 229910019064 Mg-Si Inorganic materials 0.000 description 1
- 229910019406 Mg—Si Inorganic materials 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 240000006394 Sorghum bicolor Species 0.000 description 1
- 235000011684 Sorghum saccharatum Nutrition 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 229940099112 cornstarch Drugs 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention belongs to casting technology fields, and in particular to a kind of casting method of die casting, including：(1) ingredient weighs raw material according to the composition of casting, melts, refines in smelting furnace, refining, and adjusting component obtains molten alloy；(2) mold prepares, and prepares metal die according to the shape of casting to be cast, mold is preheating to 80~120 DEG C, is then placed in dip-coating in compression mod coating, dries at a temperature of being then transferred to 60~80 DEG C；(3) ready mold in step (2) is preheating to 300~350 DEG C, into preheated mold, die cast obtains casting by molten alloy casting in step (1)；In casting method provided by the invention, improved compression mod coating has good thermal stability and antiscour oxidability under the washing away of high temperature metal liquid, ensure that the compression mod through coating dip coating provided by the invention has preferable casting ability, cast(ing) surface is avoided various defects occur, it is ensured that the quality of casting.
Description
Technical field
The invention belongs to casting technology fields, and in particular to a kind of casting method of die casting.
Background technique
Compression casting is a kind of by liquid or semi-solid-state metal or alloy, or liquid metal or conjunction containing reinforcer phase
Gold, the type for being packed into die-casting die under high pressure with higher speed is intracavitary, and metal or alloy is made to solidify formation casting under stress
The casting method of part.The wirking pressure of die casting is 4~500Mpa, and metal filling velocity is 0.5~120m/s, and therefore, high pressure is high
Speed is the fundamental difference of casting die Yu other casting methods.
In press casting procedure, in order to avoid casting and die-casting die soldering, reduces the frictional resistance of casting ejection and avoid pressing
Casting mold is excessively heated and uses coating, to generally requiring to include for coating：1) at high temperature, there is good lubricity；2) it waves
Hair point is low, and at 100~150 DEG C, diluent can volatilize quickly；3) there is no corrosiveness to die-casting die and die casting；4) performance
Stablizing diluent in air should not volatilize excessively and retrogradation；5) pernicious gas will not be precipitated at high temperature；It 6) will not be in die casting
Mold cavity surface generates incrustation.
The superiority and inferiority of coating can be directly related to the surface quality of die casting, or even influence the service life of die-casting die.Closely
Nian Lai, with the continuous development of die-casting technique, die casting is enlarged, structure is complicated changes, to the quality requirement of die casting coating
It is higher and higher, meanwhile, the strength built a resource-conserving and environment-friendly society pushes, and the requirement for water based paint is also got over
Come higher, but existing water based paint is difficult to meet wanting for enlarged die casting at film strength and stability in die-casting die
It asks, needs sustained improvement.
Summary of the invention
The purpose of the present invention is to provide a kind of casting methods of die casting to reduce pressure by the improvement to die-casting process
The surface defect of casting improves the quality of die casting.
To achieve the goals above, the present invention is achieved by the following scheme：
A kind of casting method of die casting, includes the following steps：
(1) ingredient weighs raw material according to the composition of casting, melts, refines in smelting furnace, refining, and adjusting component obtains molten
Melt shape alloy；
(2) mold prepares, and prepares metal die according to the shape of casting to be cast, mold is preheating to 80~120 DEG C, is connect
Dip-coating in merging compression mod coating, dried at a temperature of being then transferred to 60~80 DEG C；
(3) ready mold in step (2) is preheating to 300~350 DEG C, by molten alloy casting in step (1)
Into preheated mold, die cast obtains casting；
The feedstock composition for being used to prepare the compression mod coating includes the raw material of following parts by weight：Mullite powder 45~
60 parts, 5~15 parts of carbon source, 10~15 parts of glass powder with low melting point, 18~30 parts of magnesia, 30~45 parts of inorganic binder, go from
80~100 parts of sub- water.
In further technical solution, the granularity of the mullite powder is 250~300 mesh.
In further technical solution, the granularity of the magnesia is 200~300 mesh.
In further technical solution, the feedstock composition for being used to prepare the compression mod coating includes following weight
The raw material of part：50~55 parts of mullite powder, 8~12 parts of carbon source, 12~14 parts of glass powder with low melting point, 22~25 parts of magnesia, nothing
35~40 parts of machine binder, 85~95 parts of deionized water.
In further technical solution, the feedstock composition for being used to prepare the compression mod coating includes following weight
The raw material of part：53 parts of mullite powder, 13 parts of glass powder with low melting point, 24 parts of magnesia, 38 parts of inorganic binder, is gone at 10 parts of carbon source
90 parts of ionized water.
Compared with prior art, the present invention has the following technical effects：
In casting method provided by the invention, in the coating of compression mod, carbon-coated mullite powder, carbon packet burr knot
The glass powder with low melting point and magnesia of structure are formed by composite granule and expand with excellent heat storage capacity and lower line
Coefficient has good thermal stability and antiscour oxidability under the washing away of high temperature metal liquid, ensures that through this
The compression mod for inventing the coating dip coating provided has preferable casting ability, and cast(ing) surface is avoided various defects occur, it is ensured that
The quality of casting.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is furture elucidated.
The present invention provides a kind of casting methods of die casting, include the following steps：
(1) ingredient weighs raw material according to the composition of casting, melts, refines in smelting furnace, refining, and adjusting component obtains molten
Melt shape alloy；
(2) mold prepares, and prepares metal die according to the shape of casting to be cast, mold is preheating to 80~120 DEG C, is connect
Dip-coating in merging compression mod coating, dried at a temperature of being then transferred to 60~80 DEG C；
(3) ready mold in step (2) is preheating to 300~350 DEG C, by molten alloy casting in step (1)
Into preheated mold, die cast obtains casting；
The feedstock composition for being used to prepare the compression mod coating includes the raw material of following parts by weight：Mullite powder 45~
60 parts, 5~15 parts of carbon source, 10~15 parts of glass powder with low melting point, 18~30 parts of magnesia, 30~45 parts of inorganic binder, go from
80~100 parts of sub- water.
The preparation method of the compression mod coating includes the following steps：
(1) it carries out mullite powder and glass powder with low melting point to be mixed to get mixed powder, be then added into mixed powder
The aqueous solution of carbon source is stirred and is warming up to 60~90 DEG C, so that mullite powder is uniformly dispersed with glass powder with low melting point, obtains
Mixed slurry；
(2) continue the mixed slurry in whipping step (1), dry and obtained containing clad under conditions of 90~100 DEG C
Mullite powder and glass powder with low melting point, then through in vacuum, carbonization obtains carbon-coated mullite at 400~500 DEG C
Powder and glass powder with low melting point；
(3) inorganic binder is weighed by formula ratio, be then dispersed into deionized water, then sequentially added in step (2)
Carbon-coated mullite powder and glass powder with low melting point, the magnesia being prepared, high-speed stirred are uniformly mixed it to get described
Coating.
Heretofore described glass powder with low melting point is different from traditional glass powder, is a kind of using relatively environment-friendly material
Through mixing, melting copolymerization crystallizes generated silica boron metalloid salt under high temperature environment, with the significant of ultralow temperature melting
Feature, fusing point is generally at 380~780 DEG C；Specifically, if the trade mark of Guangzhou song Lin Er new material Co., Ltd production is D240
The glass powder with low melting point of (400 DEG C of melting temperature), D245 (450 DEG C of melting temperature), D250 (500 DEG C of melting temperature).
In the present invention, by coating one layer of carbon source on the surface of mullite powder and glass powder with low melting point, then through vacuum atmosphere
Calcination processing under enclosing coats to form one layer of carbon-coating on the surface of mullite powder, and since the fusing point of glass powder with low melting point is lower,
The glass powder with low melting point of carbon source is coated under the conditions of vacuum, along with the formation of carbon-coating, glass powder with low melting point also starts
The microdilatancy of volume is melted and is occurred, and due to the control of calcination temperature, is intersected with the melting temperature of glass powder with low melting point,
Respectively there is with discrete state and puncture carbon-coating in some oligomers in glass powder with low melting point, form " burr " structure.The present invention
In the compression mod coating of offer, carbon-coated mullite powder, the glass powder with low melting point of carbon packet burr structure and magnesia institute
The composite granule of formation has excellent heat storage capacity and lower linear expansion coefficient, the tool under the washing away of high temperature metal liquid
There are good thermal stability and antiscour oxidability, ensuring that has through the compression mod of coating dip coating provided by the invention
Preferable casting ability, avoids cast(ing) surface from various defects occur, it is ensured that the quality of casting.
The present invention does not do particular determination to the carbon source, can be well known to those skilled in the art, specifically, institute
The carbon source stated is starch, such as glutinous rice starch, cornstarch, pea starch, tapioca, starch from sweet potato, soybean starch, sorghum
One of starch or more than one mixture, the starch at 90 DEG C before use, be gelatinized.
The present invention does not do particular determination to the inorganic binder, can be well known to those skilled in the art, tool
Body, the inorganic binder is cementitious materials, silicon dioxide gel, the gold such as alkali silicate, phosphate, alumino-silicate
Belong to alkoxide etc., preferably waterglass.
Further, according to the present invention, the granularity of heretofore described mullite powder is 250~300 mesh.
The granularity of heretofore described magnesia is 200~300 mesh.
Within the above range by the granularity of control mullite powder and magnesia, it can be ensured that painting of the dip-coating in die-casting die
The degree of packing of layer, it is ensured that preferable erosion resistibility.
Under the conditions of, according to the invention it is preferred to, it includes following heavy for being used to prepare the feedstock composition of the compression mod coating
Measure the raw material of part：50~55 parts of mullite powder, 8~12 parts of carbon source, 12~14 parts of glass powder with low melting point, 22~25 parts of magnesia,
35~40 parts of inorganic binder, 85~95 parts of deionized water.
It is further preferred that the feedstock composition for being used to prepare the compression mod coating includes the original of following parts by weight
Material：53 parts of mullite powder, 10 parts of carbon source, 13 parts of glass powder with low melting point, 24 parts of magnesia, 38 parts of inorganic binder, deionized water
90 parts.
By the way that the content of raw material each in the feedstock composition for being used to prepare compression mod coating is limited to above-mentioned model
In enclosing, it can be ensured that the coating for obtaining good combination property improves the quality of casting.
According to the present invention, in the preparation method of the compression mod coating, in the step (2), the limit of vacuum
It is scheduled in the speed for improving carbon-coating formation, meanwhile, under vacuum conditions, the glass powder with low melting point of melting punctures carbon-coating faster,
Promote the formation of burr structure.Under optimum condition, the vacuum includes：Vacuum degree is 0.1~0.45Mpa.
The advantages of die casting casting method provided in order to further illustrate the present invention, the present invention also provides a kind of magnaliums
The pressure casting method of alloy components, includes the following steps：
S1：Ingredient, by the composition of magnesium alloy part：Al：9%；Cr：1.6%；Ce：2.6%；Si：4.2%；Ni：
0.6%；Zn：0.7%；Mn：0.15%；RE：0.3%；Surplus is Mg, and the percentage composition is weight percent；Weigh pure magnesium
Ingot, Mg-Al intermediate alloy, Mg-Si intermediate alloy, Mg-Zn intermediate alloy, Mg-Cr intermediate alloy, pure Zn, pure Ce carry out ingredient,
750 DEG C of melting 50min are warming up in smelting furnace；Using CO2+SF4 protective atmosphere melting, CO2: SF6=150-200: 1 (body
Product ratio), then temperature is adjusted to 710-720 DEG C and is refined and is refined, 20-30min is refined and refine；It is adjusted to be designated as
After point, molten alloy is obtained, it is to be cast；
S2：Mold prepares, and prepares metal die according to the shape of casting to be cast, mold is preheating to 80~120 DEG C, is connect
Dip-coating in merging compression mod coating, dried at a temperature of being then transferred to 60~80 DEG C；
S3：Mold ready in step S2 is preheating to 350 DEG C, by molten alloy casting in step S1 to preheated
Mold in, die cast obtains casting.
Embodiment 1
A kind of compression mod coating, the feedstock composition for being used to prepare the compression mod coating includes following parts by weight
Raw material：53 parts of mullite powder (300 mesh), 10 parts of glutinous rice starch, glass powder with low melting point (sing the limited public affairs of Lin Er new material purchased from Guangzhou
Department, trade mark D240) 13 parts, 24 parts of magnesia (300 mesh), 38 parts of waterglass, 90 parts of deionized water.
The preparation method of the coating includes the following steps：
(1) it carries out mullite powder and glass powder with low melting point to be mixed to get mixed powder, it is water-soluble to be subsequently added into glutinous rice starch
Liquid (mass fraction 20%) is stirred and is warming up to 80 DEG C, so that mullite powder is uniformly dispersed with glass powder with low melting point, obtains
Mixed slurry；
(2) continue the mixed slurry in whipping step (1), drying obtains not coming containing clad under conditions of 90 DEG C
Mountain flour and glass powder with low melting point, then in the atmosphere that vacuum degree is 0.30Mpa, carbonization obtains carbon-coated not next at 450 DEG C
Mountain flour and glass powder with low melting point；
(3) waterglass is weighed by formula ratio, be then dispersed into deionized water, then sequentially add preparation in step (2)
Obtained carbon-coated mullite powder and glass powder with low melting point, magnesia, high-speed stirred are uniformly mixed it to get the painting
Material.
Embodiment 2
A kind of compression mod coating, the feedstock composition for being used to prepare the compression mod coating includes following parts by weight
Raw material：50 parts of mullite powder (300 mesh), 8 parts of glutinous rice starch, glass powder with low melting point (sing the limited public affairs of Lin Er new material purchased from Guangzhou
Department, trade mark D240) 12 parts, 22 parts of magnesia (300 mesh), 35 parts of waterglass, 85 parts of deionized water.
The preparation method of the coating includes the following steps：
(1) it carries out mullite powder and glass powder with low melting point to be mixed to get mixed powder, it is water-soluble to be subsequently added into glutinous rice starch
Liquid (mass fraction 20%) is stirred and is warming up to 80 DEG C, so that mullite powder is uniformly dispersed with glass powder with low melting point, obtains
Mixed slurry；
(2) continue the mixed slurry in whipping step (1), drying obtains not coming containing clad under conditions of 90 DEG C
Mountain flour and glass powder with low melting point, then in the atmosphere that vacuum degree is 0.30Mpa, carbonization obtains carbon-coated not next at 450 DEG C
Mountain flour and glass powder with low melting point；
(3) waterglass is weighed by formula ratio, be then dispersed into deionized water, then sequentially add preparation in step (2)
Obtained carbon-coated mullite powder and glass powder with low melting point, magnesia, high-speed stirred are uniformly mixed it to get the painting
Material.
Embodiment 3
A kind of compression mod coating, the feedstock composition for being used to prepare the compression mod coating includes following parts by weight
Raw material：55 parts of mullite powder (300 mesh), 12 parts of glutinous rice starch, glass powder with low melting point (sing the limited public affairs of Lin Er new material purchased from Guangzhou
Department, trade mark D240) 14 parts, 25 parts of magnesia (300 mesh), 40 parts of waterglass, 95 parts of deionized water.
The preparation method of the coating includes the following steps：
(1) it carries out mullite powder and glass powder with low melting point to be mixed to get mixed powder, it is water-soluble to be subsequently added into glutinous rice starch
Liquid (mass fraction 20%) is stirred and is warming up to 80 DEG C, so that mullite powder is uniformly dispersed with glass powder with low melting point, obtains
Mixed slurry；
(2) continue the mixed slurry in whipping step (1), drying obtains not coming containing clad under conditions of 90 DEG C
Mountain flour and glass powder with low melting point, then in the atmosphere that vacuum degree is 0.30Mpa, carbonization obtains carbon-coated not next at 450 DEG C
Mountain flour and glass powder with low melting point；
(3) waterglass is weighed by formula ratio, be then dispersed into deionized water, then sequentially add preparation in step (2)
Obtained carbon-coated mullite powder and glass powder with low melting point, magnesia, high-speed stirred are uniformly mixed it to get the painting
Material.
Embodiment 4
A kind of compression mod coating, the feedstock composition for being used to prepare the compression mod coating includes following parts by weight
Raw material：45 parts of mullite powder (300 mesh), 5 parts of glutinous rice starch, glass powder with low melting point (sing the limited public affairs of Lin Er new material purchased from Guangzhou
Department, trade mark D240) 10 parts, 18 parts of magnesia (300 mesh), 30 parts of waterglass, 80 parts of deionized water.
The preparation method of the coating includes the following steps：
(1) it carries out mullite powder and glass powder with low melting point to be mixed to get mixed powder, it is water-soluble to be subsequently added into glutinous rice starch
Liquid (mass fraction 20%) is stirred and is warming up to 80 DEG C, so that mullite powder is uniformly dispersed with glass powder with low melting point, obtains
Mixed slurry；
(2) continue the mixed slurry in whipping step (1), drying obtains not coming containing clad under conditions of 90 DEG C
Mountain flour and glass powder with low melting point, then in the atmosphere that vacuum degree is 0.30Mpa, carbonization obtains carbon-coated not next at 450 DEG C
Mountain flour and glass powder with low melting point；
(3) waterglass is weighed by formula ratio, be then dispersed into deionized water, then sequentially add preparation in step (2)
Obtained carbon-coated mullite powder and glass powder with low melting point, magnesia, high-speed stirred are uniformly mixed it to get the painting
Material.
Embodiment 5
A kind of compression mod coating, the feedstock composition for being used to prepare the compression mod coating includes following parts by weight
Raw material：60 parts of mullite powder (300 mesh), 15 parts of glutinous rice starch, glass powder with low melting point (sing the limited public affairs of Lin Er new material purchased from Guangzhou
Department, trade mark D240) 15 parts, 30 parts of magnesia (300 mesh), 45 parts of waterglass, 100 parts of deionized water.
The preparation method of the coating includes the following steps：
(1) it carries out mullite powder and glass powder with low melting point to be mixed to get mixed powder, it is water-soluble to be subsequently added into glutinous rice starch
Liquid (mass fraction 20%) is stirred and is warming up to 80 DEG C, so that mullite powder is uniformly dispersed with glass powder with low melting point, obtains
Mixed slurry；
(2) continue the mixed slurry in whipping step (1), drying obtains not coming containing clad under conditions of 90 DEG C
Mountain flour and glass powder with low melting point, then in the atmosphere that vacuum degree is 0.30Mpa, carbonization obtains carbon-coated not next at 450 DEG C
Mountain flour and glass powder with low melting point；
(3) waterglass is weighed by formula ratio, be then dispersed into deionized water, then sequentially add preparation in step (2)
Obtained carbon-coated mullite powder and glass powder with low melting point, magnesia, high-speed stirred are uniformly mixed it to get the painting
Material.
Embodiment 6
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, the granularity of the mullite powder is
250 mesh；Remaining is constant, and coating is prepared.
Embodiment 7
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, the granularity of the magnesia is
250 mesh；Remaining is constant, and coating is prepared.
Embodiment 8
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, the granularity of the magnesia is
200 mesh；Remaining is constant, and coating is prepared.
Embodiment 9
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, the preparation method of the coating
In, in step (2), calcination processing under conditions of vacuum degree is 0.10Mpa；Remaining is constant, and coating is prepared.
Embodiment 10
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, the preparation method of the coating
In, in step (2), calcination processing under conditions of vacuum degree is 0.45Mpa；Remaining is constant, and coating is prepared.
Comparative example 1
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, it is used to prepare the compression mod and uses
Glass powder with low melting point is not contained in the feedstock composition of coating；Remaining is constant, and coating is prepared.
Comparative example 2
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, it is used to prepare the compression mod and uses
Magnesia is not contained in the feedstock composition of coating；Remaining is constant, and coating is prepared.
Comparative example 3
Such as the compression mod coating and preparation method thereof that embodiment 1 provides, unlike, it is used to prepare the compression mod and uses
The feedstock composition of coating includes the raw material of following parts by weight：53 parts of mullite powder (300 mesh), 3 parts of glutinous rice starch, low melting point glass
Glass powder (singing Lin Er new material Co., Ltd, trade mark D240 purchased from Guangzhou) 8 parts, 24 parts of magnesia (300 mesh), 38 parts of waterglass,
90 parts of deionized water；Remaining is constant, and coating is prepared.
Test utilizes above-described embodiment 1-10, the phase for the casting that the mold after the coating dip coating of comparative example 1-3 is prepared
Performance is closed, and to have brushed the coating of traditional silica flour and binder (waterglass) formation as a control group；By test result
It is aggregated into table 1.
1, casting tensile strength
According to 2006 standard of GB/T1040, the INSTRON universal testing machine produced using Instron Corporation of the U.S.
Test；
2, cast(ing) surface appearance
Method by visual observation evaluates the cast(ing) surface after demoulding from casting mold.Evaluation criteria is：
○：Expression does not have molding sand trace, is smooth face；
Δ：Expression can recognize molding sand trace slightly, be slightly smooth face；
╳：It indicates that molding sand trace is obvious, is coarse face.
Table 1：Magnesium alloy cast properties
Can be seen that casting method provided by the invention not only based on above-mentioned test data may insure the casting that casting obtains
Part has preferable appearance, moreover it is possible to the further tensile strength for improving casting, it is ensured that the quality of casting.
Basic principles and main features and the features of the present invention of the invention have 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 above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (5)
1. a kind of casting method of die casting, it is characterised in that：Include the following steps：
(1) ingredient weighs raw material according to the composition of casting, melts, refines in smelting furnace, refining, and adjusting component obtains molten
Alloy；
(2) mold prepares, and prepares metal die according to the shape of casting to be cast, mold is preheating to 80~120 DEG C, is then set
Enter dip-coating in compression mod coating, is dried at a temperature of being then transferred to 60~80 DEG C；
(3) ready mold in step (2) is preheating to 300~350 DEG C, by molten alloy casting in step (1) in advance
In the good mold of heat, die cast obtains casting；
The feedstock composition for being used to prepare the compression mod coating includes the raw material of following parts by weight：Mullite powder 45~60
Part, 5~15 parts of carbon source, 10~15 parts of glass powder with low melting point, 18~30 parts of magnesia, 30~45 parts of inorganic binder, deionization
80~100 parts of water.
2. the casting method of die casting according to claim 1, it is characterised in that：The granularity of the mullite powder is 250
~300 mesh.
3. the casting method of die casting according to claim 1, it is characterised in that：The granularity of the magnesia be 200~
300 mesh.
4. the casting method of die casting according to claim 1, it is characterised in that：It is used to prepare the compression mod coating
Feedstock composition include following parts by weight raw material：50~55 parts of mullite powder, 8~12 parts of carbon source, glass powder with low melting point 12
~14 parts, 22~25 parts of magnesia, 35~40 parts of inorganic binder, 85~95 parts of deionized water.
5. the casting method of die casting according to claim 1, it is characterised in that：It is used to prepare the compression mod coating
Feedstock composition include following parts by weight raw material：53 parts of mullite powder, 10 parts of carbon source, 13 parts of glass powder with low melting point, oxidation
24 parts of magnesium, 38 parts of inorganic binder, 90 parts of deionized water.
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| CN112708816A (en) * | 2021-01-28 | 2021-04-27 | 南通成科精密铸件有限公司 | Die casting and surface treatment method thereof |
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Denomination of invention: A casting method for die-casting parts Granted publication date: 20200731 Pledgee: Industrial and Commercial Bank of China Limited Huaiyuan Branch Pledgor: Anhui Zhenli Auto Parts Co.,Ltd. Registration number: Y2024980031688 |