CN107486543A - A kind of full form casting process of case of transmission - Google Patents
A kind of full form casting process of case of transmission Download PDFInfo
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- CN107486543A CN107486543A CN201710681632.2A CN201710681632A CN107486543A CN 107486543 A CN107486543 A CN 107486543A CN 201710681632 A CN201710681632 A CN 201710681632A CN 107486543 A CN107486543 A CN 107486543A
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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
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- 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
Abstract
The invention discloses a kind of full form casting process of case of transmission, including following aspect：（1）Wax is poured, after mixing wax material is homogenized, is handled respectively at a temperature of 75 80 DEG C and 50 54 DEG C；（2）Shell makes, and distinguishes coating internal layer mould material and outer layer mould material in wax pattern surface, internal layer is 4 layers, and outer layer is 2 layers, and carries out drying and processing；（3）Dewaxing, drying shell is dewaxed at a temperature of 76 80 DEG C, and cleaned with gasoline；（4）Roasting, by drying shell respectively in 450 500 DEG C and 800 850 DEG C of roasting temperatures；（5）Cast, the static processing at 900 930 DEG C after molten iron casting, and vacuum cooled；（6）Polishing is examined, and essence casting Rear Derailleur housing is polished, and examines specification precision and internal injury.The case of transmission that the inventive method is produced, there is the characteristics of qualification rate, tensile strength are high, the contraction percentage of area is big, and wearability and resistance to elevated temperatures are good.
Description
Technical field
The invention belongs to machining technology field, and in particular to a kind of full form casting process of case of transmission.
Background technology
Model casting, also known as lost wax casting or lost-wax casting, its process characteristic for can produce it is accurate complicated, close to
Product final form, the metal parts or exquisite handicraft that can be can be used directly without processing or seldom processing, be it is a kind of near,
Only, the metal liquid forming technology of shape；Due to its excellent processing characteristics, it is widely used in precision manufactureing field, such as starts
The parts such as machine blade, nozzle, impeller, institute's processing component precision is high, and surface is smooth, and it is good to replicate processing characteristics；Model casting side
Its shortcoming of method is complex manufacturing, consume energy big, growth cost height, production cycle length.Although founding casting has its own excellent
Point, because its processing technology is complicated, influence factor is more, and there is also the defects of itself in processing, impurity, wax pour speed in wax-pattern
Fast and its dilatancy etc. is spent, can cause cast member precision and outward appearance existing defects, production part appearance is unqualified, causes
Cost and the wasting of resources；Flame retardant coating coating is thin, hardness is not up to standard, and deformation probability increases when can cause the part to pour into a mould, in addition, fire resisting
Layer shrinkage factor is excessive, calcine technology is rough, heating and cooling rate setting are unreasonable etc., shell mould can be caused to hold
Split, stomata, processing component surface the defects of coarse, missing, steel ball occur, or even can cause existing defects damage inside processing component
Wound.
The content of the invention
The present invention is directed to the problem of existing：Casting characteristic, model casting have precision high, and surface is smooth, replicates processing
Performance is good；But complex manufacturing, power consumption are greatly, growth cost is high, production cycle length.Processing technology defect, processing influence because
Element is more, and impurity, wax water velocity be fast in wax-pattern and its dilatancy etc., can cause cast member precision and outward appearance exist it is scarce
Fall into；Flame retardant coating coating is thin, hardness is not up to standard, and deformation probability increases when can cause the part to pour into a mould；Flame retardant coating shrinkage factor is excessive, calcining
Technique is rough, heating and cooling rate setting are unreasonable etc., can cause cracking shell mould, stomata, processing component table
There is the defects of coarse, missing, steel ball in face, or even can cause existing defects damage inside processing component.To solve the above problems,
The invention provides a kind of full form casting process of case of transmission.
The present invention is achieved by the following technical solutions：
A kind of full form casting process of case of transmission, including following aspect：
（1）Pour wax：First mould is immersed in absolute ethyl alcohol and carries out cleaning treatment, the impurity such as particle in mould, dust can be removed, carried
The fillibility and surface flatness of high wax, mixing wax material heat carry out homogenize process, under 170-180kPa pressure to
Mould is carried out pouring wax, and 35-40min is then handled under the conditions of 75-80 DEG C, pressure 0.2-0.3MPa, while is carried out ultrasonic wave and shaken
15-20min is swung, then 1-2h is handled under the conditions of 50-54 DEG C, pressure 0.4-0.5MPa, while carries out supersonic oscillations 25-
30min, high temperature can promote Bubble in wax, then pass through the pressuring method that cools, wax slow coagulation, after high pressure improves condensation
Compactedness of the wax in mould, wax compact structure after solidification is improved, wax-pattern is made after cooling；
（2）Shell makes：To wax-pattern coating 1-2mm thickness internal layer mould material, internal layer coating prepare dolomite dust in composition, silicon nitride,
The compositions such as carborundum, coated inside can be made to be formed after calcining, and high temperature resistant, compact structure, shrinkage factor be small, mould internal layer of good toughness,
Brush 4 times after can effectively reducing pattern cast and deformation probability occur, it is 55%-60% to keep drying humidity, at a temperature of 34-38 DEG C
Bake 12-15min, coating internal layer mould material 4 times repeatedly, outer layer mould material after resurfacing 1-2mm, add silica flour in composition, and carry
The content of high-alumina and titanium dioxide, the strong outer coating knot of fire resistance height, good heat conductivity, hardness can be formed in outer layer
Structure, reduction high temperature deformation and the not close phenomenon of uneven heating component infrastructure, coating 2 times repeatedly after drying, and in temperature 34-
38 DEG C, dry 1-2h under the conditions of humidity 63%-67%, drying shell is made；
（3）Dewaxing：Drying shell is dewaxed at a temperature of 76-80 DEG C, gasoline cleaning 10- is then added into shell after dewaxing
15min, dewaxing shell is made after drying；
（4）Roasting：Dewaxing shell is first calcined 20-30min at 450-500 DEG C, then 2-3h is calcined at 800-850 DEG C, wherein
Rate of rise in temperature is 8 DEG C/min, and temperature drop rate is 5 DEG C/min, and casting die is made；Prevent under the condition of high temperature in temperature
Rise or decline it is too fast, cause mould uneven heating produce slight crack, deformation, and be calcined rear mold compact structure difference and smoothness
It is low；
（5）Casting：Molten iron is poured into a mould into casting die, and 40-45min is handled at 900-930 DEG C, it is cold under vacuum
But case of transmission is made afterwards；
（6）Polishing is examined：Essence casting Rear Derailleur housing is polished, examines specification precision and internal injury.
Step（1）Described cleaning treatment, its temperature are 53-58 DEG C, time 30-35min.
Step（1）Described mixing wax material, wherein paraffin：Resin base wax material：Stearic acid quality proportioning is 7:2:0.3.
Step（1）Described homogenize process, its temperature are 67-70 DEG C, time 40-50min.
Step（2）Described internal layer mould material, its compound method are：
According to quality weighing water intaking glass 34-40 parts, dolomite dust 11-14 parts, aluminium base adhesive 3-4 parts, carborundum powder 7-9 parts,
N-octyl alcohol 4-5 parts, titanium dioxide 2-4 parts, silicon nitride 1-3 parts, the deionized water heating of 2-3 times of its quality is added into waterglass
To 97-100 DEG C, other raw materials such as dolomite dust, aluminium base adhesive are then sequentially added, are stirred under the conditions of 450-480r/min
43-50min, into dilute gluey state, internal layer mould material is made；
Step（2）Described outer layer mould material, its compound method are：
According to quality weighing water intaking glass 42-46 parts, silica flour 13-15 parts, carborundum 5-7 parts, alumina powder 6-9 parts, titanium dioxide
Titanium valve 4-5 parts, aluminium base adhesive 2-3 parts, the deionized water that 2-3 times of its quality is added into waterglass are heated to 97-100 DEG C,
And other raw materials are added, 40-50min is stirred, into dilute gluey state, outer layer mould material is made.
Step（5）Described cast, its temperature are 700-750 DEG C.
The present invention has advantages below compared with prior art：Wax method is poured, mould is subjected to ethanol heating clearly before wax is filled
Wash, the impurity such as particle in mould, dust can be removed, improve the fillibility and surface flatness of wax, batch mixing wax material is carried out equal
Matterization stirs, and improves the uniformity of batch mixing wax material；Respectively at a temperature of 75-80 DEG C, 50-54 DEG C by way of improving pressure pair
The processing of wax rear mold is poured, high-temperature can promote Bubble in wax, then high by the pressuring method that cools, wax slow coagulation
Pressure improves compactedness of the wax in mould after condensation, improves wax compact structure after solidification, prevents too fast shunk that cool
Rate influences, and causes wax dimensional discrepancy occur after condensing, processing component precision is unqualified.Shell preparation method, is applied using internal layer
Layer is brushed 4 times, outer coating brushing 2 times, and internal layer coating prepares the composition such as dolomite dust, silicon nitride, carborundum in composition, can make
Form that high temperature resistant, compact structure, shrinkage factor be small, mould internal layer of good toughness after coated inside calcining, brushing 4 times effectively to reduce
There is deformation probability after pattern cast, and outer layer is prepared and adds silica flour in composition, and improve containing for aluminum oxide and titanium dioxide
Amount, the strong outer coating structure of fire resistance height, good heat conductivity, hardness can be formed in outer layer, protection can be played to internal layer coating
With reinforcing function, high temperature deformation, the not close phenomenon of uneven heating component infrastructure are reduced.Method of roasting, respectively in 450-500
DEG C and 800-850 DEG C at a temperature of shell mould is calcined, and control temperature raising and lowering speed, prevent under the condition of high temperature
Temperature rise or fall it is too fast, cause mould uneven heating produce slight crack, deformation, and be calcined rear mold compact structure difference and
Smoothness is low, has influence on component processing quality.Pouring procedure, molten iron is irrigated into shell mould at high temperature, and in 900-
Stood at a temperature of 930 DEG C, can promote to merge between each composition in molten iron, improve the compactness of modular construction.
Embodiment
Embodiment 1：
A kind of full form casting process of case of transmission, including following aspect：
（1）Pour wax：First mould is immersed in absolute ethyl alcohol and carries out cleaning treatment, the impurity such as particle in mould, dust can be removed, carried
The fillibility and surface flatness of high wax, mixing wax material is heated and carries out homogenize process, to mould under 174kPa pressure
Carry out pouring wax, 36min is then handled under the conditions of 76 DEG C, pressure 0.23MPa, while carry out supersonic oscillations 16min, then 52
DEG C, handle 1.5h under the conditions of pressure 0.42MPa, while carry out supersonic oscillations 26min, high temperature can promote bubble in wax to analyse
Go out, then compactedness of the wax in mould after condensation is improved by the pressuring method that cools, wax slow coagulation, high pressure, improve solidifying
Gu wax compact structure after, is made wax-pattern after cooling；
（2）Shell makes：To wax-pattern coating 1-2mm thickness internal layer mould material, internal layer coating prepare dolomite dust in composition, silicon nitride,
The compositions such as carborundum, coated inside can be made to be formed after calcining, and high temperature resistant, compact structure, shrinkage factor be small, mould internal layer of good toughness,
Brush 4 times after can effectively reducing pattern cast and deformation probability occur, it is 56% to keep drying humidity, is baked at a temperature of 35 DEG C
13min, coating internal layer mould material 4 times repeatedly, outer layer mould material after resurfacing 1-2mm, silica flour is added in composition, and improve aluminum oxide
With the content of titanium dioxide, the strong outer coating structure of fire resistance height, good heat conductivity, hardness can be formed in outer layer, reduced high
Warm deformation and the not close phenomenon of uneven heating components interior, coating 2 times repeatedly after drying, and in 35 DEG C of temperature, the condition of humidity 64%
Lower drying 1.5h, drying shell is made；
（3）Dewaxing：Drying shell is dewaxed at a temperature of 77 DEG C, gasoline cleaning 12min is then added into shell after dewaxing,
Dewaxing shell is made after drying；
（4）Roasting：Dewaxing shell is first calcined 23min at 454 DEG C, then 2.5h is calcined at 820 DEG C, wherein rate of rise in temperature
For 8 DEG C/min, temperature drop rate is 5 DEG C/min, and casting die is made；Prevent that temperature rose or fell under the condition of high temperature
It hurry up, cause mould uneven heating to produce slight crack, deformation, and it is low with smoothness to be calcined rear mold compact structure difference；
（5）Casting：Molten iron is poured into a mould into casting die, and 42min is handled at 910 DEG C, is made after cooling down under vacuum
Obtain case of transmission；
（6）Polishing is examined：Essence casting Rear Derailleur housing is polished, examines specification precision and internal injury.
Step（1）Described cleaning treatment, its temperature are 54 DEG C, time 32min.
Step（1）Described mixing wax material, wherein paraffin：Resin base wax material：Stearic acid quality proportioning is 7:2:0.3.
Step（1）Described homogenize process, its temperature are 68 DEG C, time 43min.
Step（2）Described internal layer mould material, its compound method are：
According to 35 parts of glass of quality weighing water intaking, 12 parts of dolomite dust, 3.2 parts of aluminium base adhesive, 7.4 parts of carborundum powder, n-octyl alcohol
4.3 parts, 2.7 parts of titanium dioxide, 1.8 parts of silicon nitride, the deionized water that 2 times of its quality is added into waterglass is heated to 98 DEG C,
Then other raw materials such as dolomite dust, aluminium base adhesive are sequentially added, 44min is stirred under the conditions of 460r/min, into dilute glue
State, internal layer mould material is made；
Step（2）Described outer layer mould material, its compound method are：
According to 43 parts of glass of quality weighing water intaking, 13.5 parts of silica flour, 5.6 parts of carborundum, 6.8 parts of alumina powder, titanium dioxide powder
4.3 parts, 2.4 parts of aluminium base adhesive, the deionized water that 2 times of its quality is added into waterglass is heated to 98 DEG C, and adds other
Raw material, 43min is stirred, into dilute gluey state, outer layer mould material is made.
Step（5）Described cast, its temperature are 720 DEG C.
Embodiment 2：
（1）Pour wax：First mould is immersed in absolute ethyl alcohol and carries out cleaning treatment, the impurity such as particle in mould, dust can be removed, carried
The fillibility and surface flatness of high wax, mixing wax material is heated and carries out homogenize process, to mould under 177kPa pressure
Carry out pouring wax, 39min is then handled under the conditions of 78 DEG C, pressure 0.28MPa, while carry out supersonic oscillations 19min, then 53
DEG C, handle 2h under the conditions of pressure 0.48MPa, while carry out supersonic oscillations 29min, high temperature can promote Bubble in wax,
Compactedness of the wax in mould after condensation is improved by the pressuring method that cools, wax slow coagulation, high pressure again, after improving solidification
Wax compact structure, wax-pattern is made after cooling；
（2）Shell makes：To wax-pattern coating 1-2mm thickness internal layer mould material, internal layer coating prepare dolomite dust in composition, silicon nitride,
The compositions such as carborundum, coated inside can be made to be formed after calcining, and high temperature resistant, compact structure, shrinkage factor be small, mould internal layer of good toughness,
Brush 4 times after can effectively reducing pattern cast and deformation probability occur, it is 59% to keep drying humidity, is baked at a temperature of 37 DEG C
14min, coating internal layer mould material 4 times repeatedly, outer layer mould material after resurfacing 1-2mm, silica flour is added in composition, and improve aluminum oxide
With the content of titanium dioxide, the strong outer coating structure of fire resistance height, good heat conductivity, hardness can be formed in outer layer, reduced high
Warm deformation and the not close phenomenon of uneven heating components interior, coating 2 times repeatedly after drying, and in 37 DEG C of temperature, the condition of humidity 66%
Lower drying 2h, drying shell is made；
（3）Dewaxing：Drying shell is dewaxed at a temperature of 79 DEG C, gasoline cleaning 14min is then added into shell after dewaxing,
Dewaxing shell is made after drying；
（4）Roasting：Dewaxing shell is first calcined 28min at 480 DEG C, then 3h is calcined at 840 DEG C, wherein rate of rise in temperature is
8 DEG C/min, temperature drop rate is 5 DEG C/min, and casting die is made；Prevent that temperature rises or falls too fast under the condition of high temperature,
Mould uneven heating is caused to produce slight crack, deformation, and it is low with smoothness to be calcined rear mold compact structure difference；
（5）Casting：Molten iron is poured into a mould into casting die, and 44min is handled at 920 DEG C, is made after cooling down under vacuum
Obtain case of transmission；
（6）Polishing is examined：Essence casting Rear Derailleur housing is polished, examines specification precision and internal injury.
Step（1）Described cleaning treatment, its temperature are 57 DEG C, time 34min.
Step（1）Described mixing wax material, wherein paraffin：Resin base wax material：Stearic acid quality proportioning is 7:2:0.3.
Step（1）Described homogenize process, its temperature are 69 DEG C, time 48min.
Step（2）Described internal layer mould material, its compound method are：
According to 39 parts of glass of quality weighing water intaking, 13.5 parts of dolomite dust, 3.7 parts of aluminium base adhesive, 8.5 parts of carborundum powder, just pungent
4.6 parts of alcohol, 3.2 parts of titanium dioxide, 2.4 parts of silicon nitride, the deionized water that 3 times of its quality is added into waterglass are heated to 99
DEG C, other raw materials such as dolomite dust, aluminium base adhesive are then sequentially added, 48min is stirred under the conditions of 470r/min, into dilute glue
State, internal layer mould material is made；
Step（2）Described outer layer mould material, its compound method are：
According to 44 parts of glass of quality weighing water intaking, 14.2 parts of silica flour, 6.5 parts of carborundum, 8.4 parts of alumina powder, titanium dioxide powder
4.2 parts, 2.7 parts of aluminium base adhesive, the deionized water that 3 times of its quality is added into waterglass is heated to 98 DEG C, and adds other
Raw material, 47min is stirred, into dilute gluey state, outer layer mould material is made.
Step（5）Described cast, its temperature are 740 DEG C.
Contrast 1：
This contrast 1 does not carry out step compared with embodiment 1（1）In pour wax method, other steps are same as Example 1.
Contrast 2：
This contrast 2 is compared with embodiment 1, step（2）In be used only internal layer coating or outer coating, other steps and embodiment 1
It is identical.
Contrast 3：
This contrast 3 is compared with embodiment 1, step（2）Floating coat number is 2 layers of internal layer coating, outer coating 1 time, other steps
It is same as Example 1.
Contrast 4：
This contrast 4 does not carry out step compared with embodiment 2（4）Middle method of roasting, other steps are same as Example 2.
Contrast 5：
This contrast 5 does not carry out step compared with embodiment 2（5）Middle pouring procedure, other steps are same as Example 2.
Control group：
Control group tradition casting method, the unused present invention pour wax method, paint coatings method, method of roasting and pouring procedure.
To embodiment 1, embodiment 2, contrast 1, contrast 2, contrast 3, contrast 4, contrast 5 and control group experimental program, statistics
The bending strength of shell（Rockwell hardness）And casting qualified rate, tensile strength, the contraction percentage of area are compared.
Experimental data：
| Project | Flexural strength HRC | Casting qualified rate % | Tensile strength Mpa | Contraction percentage of area % |
| Embodiment 1 | 23.45 | 98.54% | 174.3 | 54.60% |
| Embodiment 2 | 23.27 | 98.26% | 173.6 | 53.90% |
| Contrast 1 | 23.36 | 97.65% | 169.0 | 54.30% |
| Contrast 2 | 22.14 | 96.81% | 164.0 | 52.08% |
| Contrast 3 | 22.30 | 97.47% | 167.9 | 52.35% |
| Contrast 4 | 19.60 | 96.16% | 161.1 | 46.67% |
| Contrast 5 | 23.32 | 96.89% | 165.5 | 49.25% |
| Control group | 17.32 | 91.38% | 131.7 | 37.80% |
Synthesis result：The case of transmission that the inventive method is produced, there is qualification rate, tensile strength height, the contraction percentage of area
The characteristics of big, and it is respectively provided with good performance in terms of wearability and high temperature resistant.Using coated inside and sandwich construction, shell resists
Bending strength raising 1.31HRC, 1.15HRC, casting qualified rate raising 1.73%, 1.07%, tensile strength raising 10.3Mpa,
6.4Mpa, the contraction percentage of area improve 2.52%, 2.25%；And roasting and pouring procedure are used, shell flexural strength improves
3.67HRC, 0HRC, casting qualified rate improve 2.10%, 1.37%, and tensile strength improves 12.5Mpa, 8.1Mpa, section shrinkage
Rate improves 7.23%, 4.65%.
Claims (7)
1. a kind of full form casting process of case of transmission, it is characterised in that including following aspect：
（1）Pour wax：First mould is immersed in absolute ethyl alcohol and carries out cleaning treatment, mixing wax material is heated and carries out homogenize process,
Carry out to mould pouring wax under 170-180kPa pressure, then handle 35- under the conditions of 75-80 DEG C, pressure 0.2-0.3MPa
40min, while supersonic oscillations 15-20min is carried out, then 1-2h is handled under the conditions of 50-54 DEG C, pressure 0.4-0.5MPa, together
Shi Jinhang supersonic oscillations 25-30min, wax-pattern is made after cooling；
（2）Shell makes：To wax-pattern coating 1-2mm thickness internal layer mould material, it is 55%-60% to keep drying humidity, in 34-38 DEG C of temperature
Lower baking 12-15min, coating internal layer mould material 4 times repeatedly, outer layer mould material after resurfacing 1-2mm, coating 2 times repeatedly after drying, most
1-2h is dried under the conditions of 34-38 DEG C of temperature, humidity 63%-67% afterwards, drying shell is made；
（3）Dewaxing：Drying shell is dewaxed at a temperature of 76-80 DEG C, gasoline cleaning 10- is then added into shell after dewaxing
15min, dewaxing shell is made after drying；
（4）Roasting：Dewaxing shell is first calcined 20-30min at 450-500 DEG C, then 2-3h is calcined at 800-850 DEG C, wherein
Rate of rise in temperature is 8 DEG C/min, and temperature drop rate is 5 DEG C/min, and casting die is made；
（5）Casting：Molten iron is poured into a mould into casting die, and 40-45min is handled at 900-930 DEG C, it is cold under vacuum
But case of transmission is made afterwards；
（6）Polishing is examined：Essence casting Rear Derailleur housing is polished, examines specification precision and internal injury.
2. the full form casting process of case of transmission as claimed in claim 1, it is characterised in that step（1）At described cleaning
Reason, its temperature are 53-58 DEG C, time 30-35min.
3. the full form casting process of case of transmission as claimed in claim 1, it is characterised in that step（1）Described blended wax
Material, wherein paraffin：Resin base wax material：Stearic acid quality proportioning is 7:2:0.3.
4. the full form casting process of case of transmission as claimed in claim 1, it is characterised in that step（1）Described homogenizes
Processing, its temperature are 67-70 DEG C, time 40-50min.
5. the full form casting process of case of transmission as claimed in claim 1, it is characterised in that step（2）Described internal layer mould
Material, its compound method are：
According to quality weighing water intaking glass 34-40 parts, dolomite dust 11-14 parts, aluminium base adhesive 3-4 parts, carborundum powder 7-9 parts,
N-octyl alcohol 4-5 parts, titanium dioxide 2-4 parts, silicon nitride 1-3 parts, the deionized water heating of 2-3 times of its quality is added into waterglass
To 97-100 DEG C, other raw materials such as dolomite dust, aluminium base adhesive are then sequentially added, are stirred under the conditions of 450-480r/min
43-50min, into dilute gluey state, internal layer mould material is made.
6. the full form casting process of case of transmission as claimed in claim 1, it is characterised in that step（2）Described outer layer mould
Material, its compound method are：
According to quality weighing water intaking glass 42-46 parts, silica flour 13-15 parts, carborundum 5-7 parts, alumina powder 6-9 parts, titanium dioxide
Titanium valve 4-5 parts, aluminium base adhesive 2-3 parts, the deionized water that 2-3 times of its quality is added into waterglass are heated to 97-100 DEG C,
And other raw materials are added, 40-50min is stirred, into dilute gluey state, outer layer mould material is made.
7. the full form casting process of case of transmission as claimed in claim 1, it is characterised in that step（5）Described cast, its
Temperature is 700-750 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855463A (en) * | 2017-11-18 | 2018-03-30 | 蚌埠市嘉实机电设备制造有限公司 | A kind of processing method of high-temperature resistant double-layer fusible pattern |
| CN108127082A (en) * | 2017-12-22 | 2018-06-08 | 株洲九方铸造有限责任公司 | A kind of shell anti-deformation process |
| CN108356224A (en) * | 2018-02-28 | 2018-08-03 | 浙江立大阀门有限公司 | A kind of valve essence casting environment-protective process flow |
| CN110695622A (en) * | 2019-10-17 | 2020-01-17 | 汕头市摩根冶金实业有限公司 | Copying processing method for complex shape and position of inlet eccentric shaft |
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| CN107855463B (en) * | 2017-11-18 | 2020-12-08 | 阜阳颍知网络信息科技有限公司 | Processing method of high-temperature-resistant double-layer fusible pattern |
| CN108127082A (en) * | 2017-12-22 | 2018-06-08 | 株洲九方铸造有限责任公司 | A kind of shell anti-deformation process |
| CN108356224A (en) * | 2018-02-28 | 2018-08-03 | 浙江立大阀门有限公司 | A kind of valve essence casting environment-protective process flow |
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