CN103611885B - Method and device for dewaxing investment precision casting shell and flash burning dewaxing furnace - Google Patents
Method and device for dewaxing investment precision casting shell and flash burning dewaxing furnace Download PDFInfo
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- CN103611885B CN103611885B CN201310605171.2A CN201310605171A CN103611885B CN 103611885 B CN103611885 B CN 103611885B CN 201310605171 A CN201310605171 A CN 201310605171A CN 103611885 B CN103611885 B CN 103611885B
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Abstract
The invention relates to the technical field of investment precision casting and particularly relates to a method and a device for dewaxing an investment precision casting shell and a flash burning dewaxing furnace. The method comprises the following steps: (1) putting a module shell into a steam dewaxing furnace and dewaxing by steam for 1-1.5 minutes, wherein the dewaxing pressure is 0.6MPa and the dewaxing temperature is 160+/-3 DEG C; (2) inputting inflaming retarding gas into the steam dewaxing furnace and pre-heating the steam dewaxing furnace to be at 850 DEG C; rapidly filling the module shell processed in the step (1) into the flash burning dewaxing furnace and performing high-temperature flash burning dewaxing for 10-30 minutes, wherein the dewaxing temperature is 850+/-10 DEG C, and a heating manner of the flash burning dewaxing furnace adopts an electric heating manner or a natural gas ignition heating manner. With the adoption of the method, the shell does not have cracks caused by wax expansion in the dewaxing process and the redissolution of surface-layer yttrium oxide, caused by water absorption and moisture absorption, does not occur.
Description
Technical field
The present invention relates to melted module precise casting technology field, dewaxing furnace is burnt in method and apparatus and the sudden strain of a muscle of particularly fired mold precision casting type shell dewaxing.
Background technology
As a material near-net-shape technology, precision-investment casting plays irreplaceable effect in the shaping of high accuracy, labyrinth casting, particularly high smelting temperature, high chemically active metal.Full form casting process process comprises compacting wax-pattern, group tree, shell processed, dewaxing, roasting, is cast into foundry goods.
The advantages such as it is little that titanium or titanium alloy has density, and intensity is high and corrosion-resistant, have important application in aerospace industry.The titanium alloy casting that the various Aeronautics and Astronautics large, medium and small type quality requirement of the wall thickness≤3mm of current production in enormous quantities is high all adopts precision-investment casting.
In titanium alloy precise-investment casting, surface shell technique is one of technology.Its process for making shell scheme is that surface layer is made up of the extraordinary oxide (as yittrium oxide, zirconia) that chemical stability is high, and all the other type shell materials are identical with common investment pattern precision casting technique with process for making shell.
The process for dewaxing of titanium alloy precise-investment casting to shell has two kinds: a kind of is trichloro-ethylene lost-wax process, although at dewaxing process, this technique can ensure that shell is not expanded by wax material fusing cause cause cracking, but trichloro-ethylene belongs to chemical toxicant product, be prohibited from using gradually health injury is very large; Another kind is steam dewaxing method, the equipment that this technique uses is steam dewaxing stove, this technique requires very tight to the shell Modeling Material of titanium alloy precise-investment casting, in order to high-precision Aero-Space titanium alloy casting can be produced, the surface layer of domestic employing is yttrium shell, but yittrium oxide has stronger water imbibition thus causes steam course surface layer can produce back dissolving phenomenon.
Summary of the invention
The object of the present invention is to provide a kind of method that fired mold precision casting type shell dewaxes, to make shell not only there will not be in dewaxing process because wax material expands the crackle caused, nor there will be the surface layer yittrium oxide back dissolving because water suction, the moisture absorption cause.The present invention also aims to provide a kind of be exclusively used in the method implementing the dewaxing of above-mentioned fired mold precision casting type shell device and a kind ofly burn dewaxing furnace for the sudden strain of a muscle in said apparatus.
To achieve these goals, the method of fired mold precision casting type shell dewaxing of the present invention adopts following technical scheme: the method for fired mold precision casting type shell dewaxing, comprise the following steps: 1) module shell is put into steam dewaxing stove and carry out 1 ~ 1.5 minute steam dewaxing, dewaxing pressure is 0.6MPa, dewaxing temperature 160 ± 3 DEG C; 2) in sudden strain of a muscle burning dewaxing furnace, fire-retardant gas is inputted, dewaxing furnace is burnt in sudden strain of a muscle and is preheated to 850 degree, then the module shell after processing through step 1 is loaded fast to dodge and burn in dewaxing furnace the high temperature carried out 10 ~ 30 minutes and dodge and burn dewaxing, dewaxing temperature is 850 ± 10 DEG C, and dodging the mode of heating burning dewaxing furnace employing is electrical heating or natural gas fired heating.
Preparation process before the method that fired mold precision casting type shell dewaxes also comprises dewaxing: lay down module shell frock, then cuts the cup of module shell, dewaxing mouth and rising head, then adopts compressed air to be cleaned out module shell cut edge.
The beneficial effect of the method for fired mold precision casting type shell dewaxing of the present invention: dodge " the mixing lost-wax process " of burning dewaxing after present invention employs first steam dewaxing, the dewaxing time in steam dewaxing process is short and dewaxing temperature is low, wax material in module shell is just softening and do not melt completely, shell can not cause cracking because wax material expands, and the wax material of shell contact position soften after and shell between there is certain gap, burn in dewaxing process in sudden strain of a muscle subsequently and would not occur causing shell to occur crackle because wax-pattern acutely melts expansion, take off the shell surface of wax material by after 850 degree of high temperature just one-step baking, shell surface is without moisture, thus shell surface layer back dissolving can not be caused.Therefore visible, adopt method of the present invention that shell can be made not only to there will not be in dewaxing process because wax material expands the crackle caused, nor there will be the surface layer yittrium oxide back dissolving because water suction, the moisture absorption cause.
To achieve these goals, the device of fired mold precision casting type shell dewaxing of the present invention adopts following technical scheme: the device of fired mold precision casting type shell dewaxing, comprise steam dewaxing stove, also comprise dodging and burn dewaxing furnace, described sudden strain of a muscle is burnt dewaxing furnace and is comprised body of heater, the dewaxing dish for putting module shell is provided with in body of heater, body of heater is provided with the electric heater of natural gas line for heating furnace body inner chamber of lighting a fire or electric furnace intracoelomic cavity, body of heater is also provided with the fire-retardant gas pipeline inputting fire-retardant gas in body of heater, dewaxing dish is provided with for the de-waxing pipe with body of heater ft connection.
Body of heater is also provided with chimney.
To achieve these goals, sudden strain of a muscle of the present invention is burnt dewaxing furnace and is adopted following technical scheme: dodge and burn dewaxing furnace, comprise body of heater, the dewaxing dish for putting module shell is provided with in body of heater, body of heater is provided with the electric heater of natural gas line for heating furnace body inner chamber of lighting a fire or electric furnace intracoelomic cavity, body of heater is also provided with the fire-retardant gas pipeline for inputting fire-retardant gas in body of heater, dewaxing dish is provided with for the de-waxing pipe with body of heater ft connection.
Body of heater is also provided with chimney.
The beneficial effect of the device of fired mold precision casting type shell dewaxing of the present invention: this device comprises steam dewaxing stove and dodges burning dewaxing furnace, in use, steam dewaxing stove can be first adopted to carry out the steam dewaxing of short time and low temperature to module shell, make wax material softening and and produce gap between shell, and then adopt sudden strain of a muscle burning dewaxing furnace to carry out high temperature dewaxing to module shell, in body of heater, fire-retardant gas is inputted by fire-retardant gas pipeline, wax material can be stoped to burn, wax material is made to melt and shell can not be caused to occur crackle, shell surface does not have moisture, thus shell surface layer there will not be back dissolving.
Further, dodge the body of heater burning dewaxing furnace and be provided with chimney, be convenient in time the flue dust in body of heater be discharged body of heater, avoid and produce flue dust on shell surface after dewaxing completes.
Accompanying drawing explanation
Fig. 1 is the structural representation of steam dewaxing stove in the embodiment 1 of the device of fired mold precision casting type shell of the present utility model dewaxing;
Fig. 2 dodges the structural representation burning dewaxing furnace in the embodiment 1 of the device of fired mold precision casting type shell of the present utility model dewaxing.
Detailed description of the invention
The device of fired mold precision casting type shell dewaxing comprises steam dewaxing stove and dodges burning dewaxing furnace.
As shown in Figure 1: steam dewaxing stove comprises housing 1, be provided with supporting disk 2 in housing 1, housing 1 is provided with drainpipe 3 and de-waxing pipe 4.Supporting disk 2 is for putting module shell 5, and drainpipe 3 is for completing laggard row pressure relief drain steam dewaxing furnaceman.The concrete structure of this steam dewaxing stove and operation principle are prior art, are not described in detail in this.
As shown in Figure 2: dodge burning dewaxing furnace and comprise body of heater 11, the dewaxing dish 12 for putting module shell is provided with in body of heater 11, dewaxing dish 12 takes the shape of the letter U structure, body of heater 11 is provided with the natural gas line 13 for heating furnace body inner chamber of lighting a fire, body of heater 11 is also provided with fire-retardant gas pipeline 14, dewaxing dish 12 is provided with for the de-waxing pipe 15 with body of heater ft connection.Wax material after thawing can drain into outside body of heater 11 by de-waxing pipe 15 in time.Fire-retardant gas pipeline 14 for inputting fire-retardant gas to stop wax material ignition in body of heater 11, and fire-retardant gas is argon gas or carbon dioxide.Adopt dodge burn dewaxing furnace module shell is heated time, wax material energy fast softening and can not burning.In order to be discharged in time by the flue dust in body of heater, body of heater is also provided with chimney 16.In other embodiments, chimney can also be saved.In the present embodiment, natural gas line 13 has two, and two natural gas lines 13 are symmetrically set in the left and right sides of upper of furnace body, and de-waxing pipe 15 is positioned at the centre that 12 bottoms are coiled in dewaxing, fire-retardant gas pipeline 14 is positioned at the bottom of body of heater and is communicated with dewaxing dish 12, and chimney 16 is positioned at the top of body of heater.
In other embodiment of the device dewaxed at fired mold precision casting type shell of the present utility model, dodging the natural gas line burnt in dewaxing furnace can also replace with electric heater, and electric heater can be used for electric furnace intracoelomic cavity.
A kind of embodiment of the method for fired mold precision casting type shell dewaxing of the present invention uses the embodiment of the device of above-mentioned fired mold precision casting type shell dewaxing to carry out, and the method comprises the following steps:
A) preparation process before dewaxing: lay down module shell frock, then cuts the cup of module shell, dewaxing mouth and rising head, then adopts compressed air to be cleaned out module shell cut edge;
B) hydrodewaxing step is heated: 1) module shell is put into steam dewaxing stove and carry out 1 ~ 1.5 minute steam dewaxing, dewaxing pressure is 0.6MPa, dewaxing temperature 160 ± 3 DEG C; 2) in sudden strain of a muscle burning dewaxing furnace, fire-retardant gas is inputted, dewaxing furnace is burnt in sudden strain of a muscle and is preheated to 850 degree, then the module shell after processing through step 1 is loaded fast to dodge and burn in dewaxing furnace the high temperature carried out 10 ~ 30 minutes and dodge and burn dewaxing (the concrete time of dewaxing determines according to module shell part dimension and structure), dewaxing temperature is 850 ± 10 DEG C, and dodging the mode of heating burning dewaxing furnace employing is natural gas fired heating.
The beneficial effect of the method is: 1, steam dewaxing 1 ~ 1.5 minute, and the wax material in module shell just softens and do not melt completely in contact shell position, and shell can not cause cracking because wax material expands; 2, softened by steam dewaxing due to the wax material with shell contact position when the steam dewaxing module of 1 ~ 1.5 minute puts into the sudden strain of a muscle burning dewaxing furnace of 850 DEG C and had certain gap with shell, having occurred crackle so burn in dewaxing process also to there will not be in sudden strain of a muscle because the violent melting dilation of wax-pattern affects shell; 3, taken off the shell surface of wax material by 850 DEG C of high temperature just one-step baking, surface, without moisture, also can not cause shell surface layer back dissolving.
When adopting method of the present invention to dewax, module shell in dewaxing process because shell surface layer back dissolving can not do not produced with contact with moisture; Normal temperature strength, the elevated temperature strength of module shell shell after dewaxing all can reach technological requirement; Module shell can be avoided because of single steam dewaxing or dodge the shell crackle that in burning dewaxing process, wax material melting dilation causes.
In other embodiment of the method dewaxed at fired mold precision casting type shell of the present invention, dodging and burn the mode of heating that dewaxing furnace adopts can also be electrical heating.
In other embodiment of the method dewaxed at fired mold precision casting type shell of the present invention, the preparation process before dewaxing can not also be comprised.
Embodiment of dodging burning dewaxing furnace of the present invention, the structure that dewaxing furnace is burnt in this sudden strain of a muscle sudden strain of a muscle of burning in the structure of dewaxing furnace and the embodiment of the device that above-mentioned fired mold precision casting type shell dewaxes is identical, and thus this partial content, it is no longer repeated.
Claims (6)
1. the method for fired mold precision casting type shell dewaxing, is characterized in that, comprise the following steps: 1) module shell is put into steam dewaxing stove and carry out 1 ~ 1.5 minute steam dewaxing, dewaxing pressure is 0.6MPa, dewaxing temperature 160 ± 3 DEG C; 2) in sudden strain of a muscle burning dewaxing furnace, fire-retardant gas is inputted, dewaxing furnace is burnt in sudden strain of a muscle and is preheated to 850 degree, then the module shell after step 1) process is loaded fast the high temperature sudden strain of a muscle burning dewaxing of dodging and burning in dewaxing furnace and carrying out 10 ~ 30 minutes, dewaxing temperature is 850 ± 10 DEG C, and dodging the mode of heating burning dewaxing furnace employing is electrical heating or natural gas fired heating.
2. the method for fired mold precision casting type shell dewaxing according to claim 1, it is characterized in that, also comprise the preparation process before dewaxing: lay down module shell frock, then cut the cup of module shell, dewaxing mouth and rising head, then adopt compressed air to be cleaned out module shell cut edge.
3. one kind is exclusively used in the device of the fired mold precision casting type shell dewaxing of method as claimed in claim 1 of implementing, comprise steam dewaxing stove, it is characterized in that: also comprise dodging and burn dewaxing furnace, described sudden strain of a muscle is burnt dewaxing furnace and is comprised body of heater, the dewaxing dish for putting module shell is provided with in body of heater, body of heater is provided with the electric heater of natural gas line for heating furnace body inner chamber of lighting a fire or electric furnace intracoelomic cavity, body of heater is also provided with the fire-retardant gas pipeline inputting fire-retardant gas in body of heater, dewaxing dish is provided with for the de-waxing pipe with body of heater ft connection.
4. the device of fired mold precision casting type shell dewaxing according to claim 3, is characterized in that: body of heater is also provided with chimney.
5. dewaxing furnace is burnt in the sudden strain of a muscle being exclusively used in method as claimed in claim 1 of implementing, it is characterized in that: comprise body of heater, the dewaxing dish for putting module shell is provided with in body of heater, body of heater is provided with the electric heater of natural gas line for heating furnace body inner chamber of lighting a fire or electric furnace intracoelomic cavity, body of heater is also provided with the fire-retardant gas pipeline for inputting fire-retardant gas in body of heater, dewaxing dish is provided with for the de-waxing pipe with body of heater ft connection.
6. dewaxing furnace is burnt in sudden strain of a muscle according to claim 5, it is characterized in that: body of heater is also provided with chimney.
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| CN201310605171.2A CN103611885B (en) | 2013-11-26 | 2013-11-26 | Method and device for dewaxing investment precision casting shell and flash burning dewaxing furnace |
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| CN201310605171.2A CN103611885B (en) | 2013-11-26 | 2013-11-26 | Method and device for dewaxing investment precision casting shell and flash burning dewaxing furnace |
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| CN103611885B true CN103611885B (en) | 2015-06-17 |
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| CN105903898B (en) * | 2016-06-12 | 2017-12-05 | 蔡政达 | Shell mould sintering method and device |
| CN107685133A (en) * | 2017-09-12 | 2018-02-13 | 东方电气集团东方汽轮机有限公司 | A kind of hot investment casting ceramic shell preparation method |
| CN110227798A (en) * | 2019-07-19 | 2019-09-13 | 上海云铸三维科技有限公司 | A kind of preparation method based on steam-heated light-cured resin investment shell |
| CN110385400A (en) * | 2019-08-13 | 2019-10-29 | 西安西工大超晶科技发展有限责任公司 | A kind of process for dewaxing of 3D printing PS powder wax-pattern |
| CN113976827B (en) * | 2021-10-29 | 2023-09-22 | 河南平原光电有限公司 | Gypsum type investment casting dry dewaxing device and dewaxing method |
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| US3878034A (en) * | 1970-06-25 | 1975-04-15 | Du Pont | Refractory laminate based on negative sol or silicate and positive sol |
| US5022920A (en) * | 1988-01-27 | 1991-06-11 | Buntrock Industries, Inc. | Method and composition for investment casting of laminar ceramic shell molds |
| US6237670B1 (en) * | 1999-10-29 | 2001-05-29 | M. Argueso & Company, Inc. | Treatment of thermoplastic materials with chelating agents, and related products |
| CN1255233C (en) * | 2004-06-14 | 2006-05-10 | 哈尔滨工业大学 | Preparing method of low-cost oxide ceramic shell for titanium alloy precision casting |
| CN100528403C (en) * | 2007-08-02 | 2009-08-19 | 哈尔滨工业大学 | Method for preparing casting titanium and titanium-aluminum base alloy porous ceramic mould shell |
| CN102284678A (en) * | 2011-08-24 | 2011-12-21 | 无锡华冶钢铁有限公司 | Method for preparing formwork of precisely-cast titanium alloy |
| CN102294436B (en) * | 2011-09-19 | 2013-01-02 | 哈尔滨实钛新材料科技发展有限公司 | Method for precisely casting titanium alloy and titanium aluminum alloy with low cost |
| CN103071764B (en) * | 2012-11-30 | 2016-03-30 | 上海大学 | For the CaZrO of titanium or titanium alloy hot investment casting 3the preparation method of shell |
| CN102990006B (en) * | 2012-11-30 | 2016-01-20 | 上海大学 | A kind of shell for titanium or titanium alloy hot investment casting and preparation method thereof |
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