CN104399891A - Casting method combining investment precise shell-making process with vacuum suction molding technology - Google Patents
Casting method combining investment precise shell-making process with vacuum suction molding technology Download PDFInfo
- Publication number
- CN104399891A CN104399891A CN201410691137.6A CN201410691137A CN104399891A CN 104399891 A CN104399891 A CN 104399891A CN 201410691137 A CN201410691137 A CN 201410691137A CN 104399891 A CN104399891 A CN 104399891A
- Authority
- CN
- China
- Prior art keywords
- shell
- wax
- casting method
- precision
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- B22C9/043—Removing the consumable pattern
-
- 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
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
Abstract
The invention discloses a casting method combining an investment precise shell-making process with a vacuum suction molding technology. The casting method comprises the following steps: manufacturing a wax pattern, assembling the wax pattern, coating the surface of a wax pattern cluster with coating, drying, dewaxing and recovering a molding shell, performing low-temperature roasting on the molding shell, binning and moulding the shell, and performing negative pressure pouring. The casting method has the advantages that the manufacturing process of the molding shell is simplified, the manufacturing cost of the molding shell is reduced, the waste discharging volume is reduced, the low-temperature roasting is adopted, energy consumption is reduced greatly, and the problem of insufficient strength of the molding shell is solved through negative pressure pouring.
Description
Technical field
The invention belongs to Investment casting technology field, be specifically related to the casting method that a kind of precision-investment process for making shell combines with vacuum moulding technology.
Background technology
Model casting typically refers to makes apperance at fusible material, makes shell at apperance Surface coating some layers of refractory material, then shell is discharged in apperance fusing, thus obtains the casting mold without die joint, can back-up sand cast after high-temperature roasting.Because apperance extensively adopts wax material to manufacture, therefore often model casting is called " lost-wax casting ".The alloy species that available investment casting is produced has carbon steel, steel alloy, heat-resisting alloy, stainless steel, Precise Alloy, permanent-magnet alloy, bearing metal, copper alloy, aluminium alloy, titanium alloy and spheroidal graphite cast-iron etc.
Baking is one of master operation of model casting, and the main purpose of Baking has: the moisture in removing shell, remaining wax material, salt grade volatile matter, make shell have fine air permeability when pouring into a mould; Make to carry out ermal physics chemical reaction between the material such as binding agent, refractory material, change composition and the microscopic structure of thing phase; Set up elevated temperature strength, reduce the temperature difference of liquid alloy and shell, improve mold-filling capacity.The modal roasting refined casting shell stove of hot investment casting industry is chamber type electric resistance furnace, and sintering temperature is between 800-1200 DEG C, and roasting time needs 25-60 minute, and because temperature is high, during Baking, energy consumption is large, and production efficiency is low.
In addition, traditional precision-investment casting generally adopts pattern of fever gravity mode to carry out casting of molten metal, after namely shell takes out from roaster, pours into a mould under red heat state.Although this pouring type can improve the mobility of molten metal in shell, ensure that foundry goods can science cavity shape well, obtain high-precision foundry goods, but, the setting rate of molten metal in pattern of fever is comparatively slow, and foundry goods can be made to produce coarse grains, the defects such as mechanical performance reduction.
Summary of the invention
Technical problem to be solved by this invention is to provide the simplification of a kind of shell manufacture craft, Baking is low, and investment shell intensity reaches the precision-investment casting method of instructions for use.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
The casting method that precision-investment process for making shell combines with vacuum moulding technology, comprises the steps:
1), wax-pattern is manufactured
The paraffin of melting is injected aluminium-making mould, after cooling, obtains accurate wax-pattern;
2), wax-pattern assembling
Welding or mechanical package method is adopted the wax-pattern forming foundry goods and the wax-pattern forming running and feeding system to be linked together formation module;
3), waxed module surface application coating, oven dry
By step 2) module be placed in coating and flood, make coating cover module equably on the surface, successively apply, successively dry; Spread dry sand after applying coatings to reinforce, gross thickness controls at 2 ~ 4mm;
4), shell dewaxing is reclaimed
After coating bone dry forms high strength shell, adopt hot water or steam-heated method the solid state wax liquefy forming apperance to be flowed out and form cavity shell;
5), shell low-temperature bake
Shell is carried out roasting at the temperature of 100 ~ 600 DEG C, removes moisture, remaining wax material and other volatile impurity in shell, make shell clean;
6), shell vanning moulding
By through roasting and the cool shell to room temperature is placed in the special sandbox of vacuum-pumping, insert the dry molding sand without any additive, after the micro-consolidation that shakes of shake table, scrape flat top portion with hand and seal with plastic sheeting;
7), vacuum-assist pouring
Under sandbox keeps vacuum degree to be the prerequisite of-0.025 ~-0.045Mpa, casting of molten metal in shell, just obtains the precision casting identical with shell geometry after solidifying.
Generally will to carry out long-time roasting under 800-1200 DEG C of high temperature before casting different from the shell of traditional precision-investment casting, and the sintering temperature of step 5) shell of the present invention is lower, more preferably 200 ~ 400 DEG C.
Step 7) Bian vacuum-assist pouring method of the present invention, compensate for the not enough problem of investment shell intensity, and the negative pressure of sandbox is preferably-0.03 ~-0.04Mpa.
Generally to apply the coating of more than 7 times from the shell of traditional precision-investment casting, that shell gross thickness is generally greater than 8mm is different, step 2 of the present invention) coating be the pasty mixture formed with powdery refractory material and binding agent, and only need apply 3-4 coating, shell gross thickness also controls at 2 ~ 4mm.
On the basis of technique scheme, the particle diameter of the dry molding sand of step 6) is 20 ~ 40 orders.
Compared with prior art, beneficial effect of the present invention is as follows:
1, the shell that this invention simplifies traditional precision-investment casting is manufactured.The shell of tradition precision-investment casting generally will apply the coating of more than 7 times, shell gross thickness is generally greater than 8mm, and the present invention only need apply 3-4 coating, and shell gross thickness controls at about 3mm, therefore, shell manufactures cost and waste discharge all can greatly reduce.
2, the high-temperature roasting operation of traditional fired mold precision casting type shell is eliminated.The shell of tradition precision-investment casting generally will carry out long-time roasting before casting under 800-1200 DEG C of high temperature, and the present invention requires lower to investment shell intensity, only need the temperature of 100 ~ 600 DEG C descending low-temperature bake, so just greatly reduce energy resource consumption.
3, pattern of fever pouring type has been abandoned.Tradition precision-investment casting generally adopts pattern of fever gravity mode to carry out casting of molten metal, although this pouring type can improve the mobility of molten metal in shell, ensure that foundry goods can science cavity shape well, obtain high-precision foundry goods, but, the setting rate of molten metal in pattern of fever is comparatively slow, and foundry goods can be made to produce coarse grains, the defects such as mechanical performance reduction.The present invention is under the prerequisite keeping certain vacuum degree, by pouring metal melt in normal temperature shell, and the defect of mechanical property reduction pattern of fever thus can being avoided pour into a mould bring.Owing to vacuumizing the gas that can be siphoned away by the micro-pore in shell in die cavity, make molten metal can filling die cavity better, therefore can not there is the defects such as misrun because of cold cast in the present invention.
4, vacuum moulding technology compensate for the not enough problem of investment shell intensity.What manufacture due to the present invention is ultra-thin shell, and the more traditional investment casting shell of intensity is much lower, directly cannot bear the pressure of molten metal.For this reason, invention introduces vacuum moulding technology, utilize negative pressure that the molding sand " bonding " tightly wrapping up shell is got up to form firm type wall, resist the pressure of molten metal with this.
Detailed description of the invention
embodiment 1
A kind of precision-investment shell casting method, comprises the steps:
1), wax-pattern is manufactured
The paraffin of melting is injected aluminium-making mould, after cooling, obtains accurate wax-pattern;
2), wax-pattern assembling
Welding or mechanical package method is adopted the wax-pattern forming foundry goods and the wax-pattern forming running and feeding system to be linked together formation module;
3), waxed module surface application coating, oven dry
By step 2) module be placed in coating and flood, the pasty mixture selecting powdery refractory material and binding agent to form is coating, covers module equably and applies 4 layers altogether on the surface, successively apply, successively dry; Spread dry sand after applying coatings to reinforce, gross thickness controls at 3mm;
4), shell dewaxing is reclaimed
After coating bone dry forms high strength shell, adopt hot water or steam-heated method the solid state wax liquefy forming apperance to be flowed out and form cavity shell;
5), shell low-temperature bake
Shell is carried out roasting at the temperature of 300 DEG C, removes moisture, remaining wax material and other volatile impurity in shell, make shell clean;
6), shell vanning moulding
By through roasting and the cool shell to room temperature is placed in the special sandbox of vacuum-pumping, insert the dry molding sand without any additive, after the micro-consolidation that shakes of shake table, scrape flat top portion with hand and seal with plastic sheeting;
7), vacuum-assist pouring
Under sandbox keeps vacuum degree to be the prerequisite of-0.035Mpa, in shell, cast aluminum alloying metal liquid, just obtains the precision casting identical with shell geometry after solidifying.
Obtained precision casting product outward appearance after being incubated, unpacking does not find any naked eyes visual defects, smooth surface, without blow-up, without defects such as cold shut, volume skin, crackle, burnings into sand, through carrying out flaw detection, cast(ing) surface and inside do not find excessive defect and crackle, after heat treatment, the indices such as mechanical property and structure property all reaches and has exceeded designing requirement.
embodiment 2
A kind of precision-investment shell casting method, compared with embodiment 1, step 5) shell low-temperature bake temperature is at 200 DEG C, during step 7) vacuum-assist pouring, sandbox keeps vacuum degree to be-0.03Mpa, other technological parameter is constant, and obtained precision casting product is through carrying out flaw detection, and cast(ing) surface and inside do not find excessive defect and crackle, after heat treatment, the indices such as mechanical property and structure property all reaches and has exceeded designing requirement.
embodiment 3
A kind of precision-investment shell casting method, compared with embodiment 1, step 5) shell low-temperature bake temperature is at 400 DEG C, during step 7) vacuum-assist pouring, sandbox keeps vacuum degree to be-0.45Mpa, other technological parameter is constant, and obtained precision casting product is through carrying out flaw detection, and cast(ing) surface and inside do not find excessive defect and crackle, after heat treatment, the indices such as mechanical property and structure property all reaches and has exceeded designing requirement.
Although give detailed description and explanation to the specific embodiment of the present invention above; but what should indicate is; we can carry out various equivalence according to conception of the present invention to above-mentioned embodiment and change and amendment; its function produced do not exceed that description contains yet spiritual time, all should within protection scope of the present invention.
Claims (5)
1. the casting method that combines with vacuum moulding technology of precision-investment process for making shell, is characterized in that comprising the steps:
1), wax-pattern is manufactured
The paraffin of melting is injected aluminium-making mould, after cooling, obtains accurate wax-pattern;
2), wax-pattern assembling
Welding or mechanical package method is adopted the wax-pattern forming foundry goods and the wax-pattern forming running and feeding system to be linked together formation module;
3), waxed module surface application coating, oven dry
By step 2) module be placed in coating and flood, make coating cover module equably on the surface, successively apply, successively dry; Spread dry sand after applying coatings to reinforce, gross thickness controls at 2 ~ 4mm;
4), shell dewaxing is reclaimed
After coating bone dry forms high strength shell, adopt hot water or steam-heated method the solid state wax liquefy forming apperance to be flowed out and form cavity shell;
5), shell low-temperature bake
Shell is carried out roasting at the temperature of 100 ~ 600 DEG C, removes moisture, remaining wax material and other volatile impurity in shell, make shell clean;
6), shell vanning moulding
By through roasting and the cool shell to room temperature is placed in the special sandbox of vacuum-pumping, insert the dry molding sand without any additive, after the micro-consolidation that shakes of shake table, scrape flat top portion with hand and seal with plastic sheeting;
7), vacuum-assist pouring
Under sandbox keeps vacuum degree to be the prerequisite of-0.025 ~-0.045Mpa, casting of molten metal in shell, just obtains the precision casting identical with shell geometry after solidifying.
2. the casting method that combines with vacuum moulding technology of a kind of precision-investment process for making shell as claimed in claim 1, is characterized in that: the sintering temperature of described step 5) shell is 200 ~ 400 DEG C.
3. the casting method that combines with vacuum moulding technology of a kind of precision-investment process for making shell as claimed in claim 1, is characterized in that: the negative pressure of described step 7) sandbox is-0.03 ~-0.04Mpa.
4. the casting method that combines with vacuum moulding technology of a kind of precision-investment process for making shell as claimed in claim 1, is characterized in that: described step 2) coating be the pasty mixture formed with powdery refractory material and binding agent, coating 3-4 layer altogether.
5. the casting method that combines with vacuum moulding technology of a kind of precision-investment process for making shell as claimed in claim 1, is characterized in that: the particle diameter of the dry molding sand of described step 6) is 20 ~ 40 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691137.6A CN104399891A (en) | 2014-11-27 | 2014-11-27 | Casting method combining investment precise shell-making process with vacuum suction molding technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691137.6A CN104399891A (en) | 2014-11-27 | 2014-11-27 | Casting method combining investment precise shell-making process with vacuum suction molding technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104399891A true CN104399891A (en) | 2015-03-11 |
Family
ID=52637594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410691137.6A Pending CN104399891A (en) | 2014-11-27 | 2014-11-27 | Casting method combining investment precise shell-making process with vacuum suction molding technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104399891A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562590A (en) * | 2015-12-23 | 2016-05-11 | 浙江斯耐尔涂装设备制造有限公司 | Novel precision casting process |
| CN105665639A (en) * | 2016-02-23 | 2016-06-15 | 重庆市大足区通达铁路车辆配件制造有限公司 | Manufacturing method for movable device of cast steel curved support |
| CN105834360A (en) * | 2015-11-18 | 2016-08-10 | 连云港源钰金属制品有限公司 | Casting method for making shell mold through 3D printing |
| CN106392007A (en) * | 2016-06-12 | 2017-02-15 | 蔡耀名 | Ceramic shell dewaxing method and device |
| CN107030256A (en) * | 2017-03-27 | 2017-08-11 | 五星机械（镇江）有限公司 | A kind of casting method of metal implements |
| CN107282888A (en) * | 2017-07-25 | 2017-10-24 | 苏州市鑫渭阀门有限公司 | The sand mould casting method of high-precision rod failure ball valve core |
| CN107486543A (en) * | 2017-08-10 | 2017-12-19 | 合肥市田源精铸有限公司 | A kind of full form casting process of case of transmission |
| CN108543912A (en) * | 2018-05-29 | 2018-09-18 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of the steel part of surface compact |
| CN108608657A (en) * | 2018-05-12 | 2018-10-02 | 来安县隆华摩擦材料有限公司 | A kind of car clutch face sheet around embryo technique |
| CN109550899A (en) * | 2018-11-27 | 2019-04-02 | 上海航天精密机械研究所 | Fusible pattern and counter-pressure casting combined shaping method |
| CN110076290A (en) * | 2019-05-15 | 2019-08-02 | 江苏荣元铸业有限公司 | A kind of gate valve body model casting casting process |
| CN111421109A (en) * | 2020-06-12 | 2020-07-17 | 广东峰华卓立科技股份有限公司 | Casting method for preparing sand mold shell based on 3D printing |
| CN111545708A (en) * | 2020-05-12 | 2020-08-18 | 唐山昊中科技有限公司 | Negative-pressure casting process for precoated sand shell type iron sand |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3669177A (en) * | 1969-09-08 | 1972-06-13 | Howmet Corp | Shell manufacturing method for precision casting |
| CN1047547C (en) * | 1990-09-06 | 1999-12-22 | 希钦拿制造有限公司 | Countergravity casting using particulate supported thin walled investment shell mold |
| CN102240778A (en) * | 2011-07-03 | 2011-11-16 | 湖北庚联耐磨材料科技有限公司 | Lost wax shell-based negative pressure dry sand and iron shot chilling vibrational casting process method |
| WO2012048321A2 (en) * | 2010-10-08 | 2012-04-12 | Buntrock Industries, Inc. | Dewax method for investment casting |
| CN103537649A (en) * | 2012-10-29 | 2014-01-29 | 洛阳希诺能源科技有限公司 | Composite casting technology of excavator bucket teeth |
| CN103658534A (en) * | 2013-12-13 | 2014-03-26 | 浙江福瑞科流控机械有限公司 | Negative-pressure precision casting process of cold-mold protective shell |
-
2014
- 2014-11-27 CN CN201410691137.6A patent/CN104399891A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3669177A (en) * | 1969-09-08 | 1972-06-13 | Howmet Corp | Shell manufacturing method for precision casting |
| CN1047547C (en) * | 1990-09-06 | 1999-12-22 | 希钦拿制造有限公司 | Countergravity casting using particulate supported thin walled investment shell mold |
| WO2012048321A2 (en) * | 2010-10-08 | 2012-04-12 | Buntrock Industries, Inc. | Dewax method for investment casting |
| CN102240778A (en) * | 2011-07-03 | 2011-11-16 | 湖北庚联耐磨材料科技有限公司 | Lost wax shell-based negative pressure dry sand and iron shot chilling vibrational casting process method |
| CN103537649A (en) * | 2012-10-29 | 2014-01-29 | 洛阳希诺能源科技有限公司 | Composite casting technology of excavator bucket teeth |
| CN103658534A (en) * | 2013-12-13 | 2014-03-26 | 浙江福瑞科流控机械有限公司 | Negative-pressure precision casting process of cold-mold protective shell |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834360A (en) * | 2015-11-18 | 2016-08-10 | 连云港源钰金属制品有限公司 | Casting method for making shell mold through 3D printing |
| CN105562590A (en) * | 2015-12-23 | 2016-05-11 | 浙江斯耐尔涂装设备制造有限公司 | Novel precision casting process |
| CN105665639A (en) * | 2016-02-23 | 2016-06-15 | 重庆市大足区通达铁路车辆配件制造有限公司 | Manufacturing method for movable device of cast steel curved support |
| CN105665639B (en) * | 2016-02-23 | 2018-02-02 | 重庆市大足区通达铁路车辆配件制造有限公司 | Cast steel curve support head preparation method |
| CN106392007B (en) * | 2016-06-12 | 2021-06-29 | 蔡耀名 | Method and device for dewaxing ceramic shell |
| CN106392007A (en) * | 2016-06-12 | 2017-02-15 | 蔡耀名 | Ceramic shell dewaxing method and device |
| CN107030256A (en) * | 2017-03-27 | 2017-08-11 | 五星机械（镇江）有限公司 | A kind of casting method of metal implements |
| CN107282888A (en) * | 2017-07-25 | 2017-10-24 | 苏州市鑫渭阀门有限公司 | The sand mould casting method of high-precision rod failure ball valve core |
| CN107486543A (en) * | 2017-08-10 | 2017-12-19 | 合肥市田源精铸有限公司 | A kind of full form casting process of case of transmission |
| CN108608657A (en) * | 2018-05-12 | 2018-10-02 | 来安县隆华摩擦材料有限公司 | A kind of car clutch face sheet around embryo technique |
| CN108543912A (en) * | 2018-05-29 | 2018-09-18 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of the steel part of surface compact |
| CN109550899A (en) * | 2018-11-27 | 2019-04-02 | 上海航天精密机械研究所 | Fusible pattern and counter-pressure casting combined shaping method |
| CN110076290A (en) * | 2019-05-15 | 2019-08-02 | 江苏荣元铸业有限公司 | A kind of gate valve body model casting casting process |
| CN111545708A (en) * | 2020-05-12 | 2020-08-18 | 唐山昊中科技有限公司 | Negative-pressure casting process for precoated sand shell type iron sand |
| CN111421109A (en) * | 2020-06-12 | 2020-07-17 | 广东峰华卓立科技股份有限公司 | Casting method for preparing sand mold shell based on 3D printing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104399891A (en) | Casting method combining investment precise shell-making process with vacuum suction molding technology | |
| CN103920852B (en) | A kind of precision casting process of large foundry goods | |
| CN103302242A (en) | Precise casing method of tiles of floating wall of combustion chamber of aeroengine | |
| CN103521715B (en) | A kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens | |
| CN105458180B (en) | A kind of shaping running channel and its preparation and method for blocking containing wax discharging port | |
| CN104384449B (en) | A kind of method controlling essence casting turbo blade grain size | |
| CN102240778A (en) | Lost wax shell-based negative pressure dry sand and iron shot chilling vibrational casting process method | |
| CN103192027A (en) | Partial cooling method of cold iron in investment casting | |
| CN105364047B (en) | Gypsum type rapid precision casting method for nonferrous metal | |
| CN104014748B (en) | The method utilizing the overall shell mould of formwork roasting apperance gasification, and combustion preparation | |
| CN101658918A (en) | Water glass type magnesium alloy fusible pattern casting process | |
| CN102161089B (en) | Inversion casting method for casting aluminum alloy long housing with two-cavity mold | |
| CN105983656A (en) | Investment casting technology | |
| CN106424562A (en) | Precision investment casting method eliminating shrinkage cavities and porosity defects | |
| CN105478672A (en) | Investment centrifugal casting method and device used for formwork dewaxing port and having plugging device | |
| CN105057593A (en) | Investment casting technology for copper alloy casting | |
| CN103658536A (en) | Fired mold low-pressure casting process of integral type compressor impeller | |
| CN110340279A (en) | Heavy castings casting method | |
| CN104741574A (en) | Low-pressure casting process of aluminum alloy steering joint | |
| CN104550719A (en) | Ice mold based investment casting technology | |
| CN106046807A (en) | High heat stability precision casting wax and preparation method thereof | |
| CN103464684A (en) | Precise investment casting method | |
| CN111496185A (en) | Production process of lost foam casting | |
| CN105537517A (en) | Manufacturing process for mould shell for investment casting of belt turning deep hole | |
| RU2314891C1 (en) | Mold making method for casting with use of investment patterns |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150311 |