CN103611885A - 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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- CN103611885A CN103611885A CN201310605171.2A CN201310605171A CN103611885A CN 103611885 A CN103611885 A CN 103611885A CN 201310605171 A CN201310605171 A CN 201310605171A CN 103611885 A CN103611885 A CN 103611885A
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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, particularly dewaxing furnace is burnt in the method and apparatus of fired mold precision casting type shell dewaxing and sudden strain of a muscle.
Background technology
As a material near-net-shape technology, precision-investment casting, in high accuracy, labyrinth casting, particularly plays irreplaceable effect in the shaping of 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 high titanium alloy casting of the large, medium and small type quality requirement of various Aeronautics and Astronautics of the wall thickness≤3mm producing in enormous quantities at present 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 consists of the high extraordinary oxide of chemical stability (as yittrium oxide, zirconia), and all the other type shell materials are identical with common investment pattern precision casting technique with process for making shell.
Titanium alloy precise-investment casting has two kinds to the process for dewaxing of shell: a kind of is trichloro-ethylene lost-wax process, although this technique can guarantee that at dewaxing process shell is not expanded and causes cracking by wax material fusing cause, but trichloro-ethylene belongs to chemical toxicant product, to health injury is very large, be prohibited from using gradually; Another kind is steam dewaxing method, the equipment that this technique is used is steam dewaxing stove, this technique requires very tight to the shell Modeling Material of titanium alloy precise-investment casting, in order to produce high-precision Aero-Space titanium alloy casting, the surface layer of domestic employing is yttrium shell, yet thereby yittrium oxide has stronger water imbibition 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 of fired mold precision casting type shell dewaxing, so that shell not only there will not be the crackle that expands and cause because of wax material in dewaxing process, nor there will be the surface layer yittrium oxide back dissolving causing because of water suction, the moisture absorption.The present invention also aims to provide a kind of device and a kind of sudden strain of a muscle for said apparatus that is exclusively used in the method for implementing above-mentioned fired mold precision casting type shell dewaxing to burn dewaxing furnace.
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 carried out 1～1.5 minute steam dewaxing, dewaxing pressure is 0.6MPa, 160 ± 3 ℃ of dewaxing temperatures; 2) to dodging to burn in dewaxing furnace, input fire-retardant gas, sudden strain of a muscle is burnt to dewaxing furnace and be preheated to 850 degree, then the module shell after step 1 is processed is packed fast into the high temperature carrying out 10～30 minutes in sudden strain of a muscle burning dewaxing furnace and dodge burning dewaxing, dewaxing temperature is 850 ± 10 ℃, and the mode of heating that dodges the employing of burning dewaxing furnace is electrical heating or natural gas fired heating.
The method of fired mold precision casting type shell dewaxing also comprises the preparation process before dewaxing: lay down module shell frock, then cut cup, dewaxing mouth and the rising head of module shell, then adopt compressed air that module shell cut edge is cleaned out.
The beneficial effect of the method for fired mold precision casting type shell dewaxing of the present invention: the present invention dodges " the mixing lost-wax process " of burning dewaxing after having adopted first steam dewaxing, dewaxing time in steam dewaxing process is short and dewaxing temperature is low, wax material in module shell just softens and not fusing completely, shell can not cause cracking because wax material expands, and there is certain gap after the wax material of shell contact position softens and between shell, in dewaxing process is burnt in sudden strain of a muscle subsequently, just there will not be because wax-pattern acutely melts to expand causes shell to occur crackle, the shell surface that has taken off wax material is by 850 degree high temperature just after one-step baking, shell surface is without moisture, thereby can not cause shell surface layer back dissolving.Therefore visible, adopt method of the present invention can make shell in dewaxing process, not only there will not be the crackle that expands and cause because of wax material, nor there will be the surface layer yittrium oxide back dissolving causing because of water suction, the moisture absorption.
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, in body of heater, be provided with for putting the dewaxing dish of module shell, body of heater is provided with for the natural gas line of the heating furnace body inner chamber of lighting a fire or the electric heater of electric furnace intracoelomic cavity, on body of heater, be also provided with to the fire-retardant gas pipeline of inputting fire-retardant gas in body of heater, dewaxing dish is provided with the de-waxing pipe for being communicated with body of heater outside.
On body of heater, be 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, in body of heater, be provided with for putting the dewaxing dish of module shell, body of heater is provided with for the natural gas line of the heating furnace body inner chamber of lighting a fire or the electric heater of electric furnace intracoelomic cavity, on body of heater, be also provided with for input the fire-retardant gas pipeline of fire-retardant gas in body of heater, dewaxing dish is provided with the de-waxing pipe for being communicated with body of heater outside.
On body of heater, be 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 and burn dewaxing furnace, in use, can first adopt steam dewaxing stove module shell to be carried out to the steam dewaxing of short time and low temperature, make wax material softening and and between shell, produce gap, and then adopt sudden strain of a muscle burning dewaxing furnace to carry out high temperature dewaxing to module shell, by fire-retardant gas pipeline, in body of heater, input fire-retardant gas, can stop wax material burning, make wax material melt and can not cause shell to occur crackle, shell surface does not have moisture, thereby shell surface layer there will not be back dissolving.
Further, the body of heater that dodges burning dewaxing furnace is provided with chimney, is convenient in time the flue dust in body of heater be discharged to body of heater, has avoided on shell surface, producing flue dust after dewaxing completes.
Accompanying drawing explanation
Fig. 1 is the structural representation of steam dewaxing stove in the embodiment 1 of device of fired mold precision casting type shell of the present invention dewaxing;
Fig. 2 dodges the structural representation that burns dewaxing furnace in the embodiment 1 of device of fired mold precision casting type shell of the present invention dewaxing.
The specific embodiment
The device of fired mold precision casting type shell dewaxing comprises steam dewaxing stove and dodges and burn 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 release draining 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, in body of heater 11, be provided with for putting the dewaxing dish 12 of module shell 5, dewaxing dish 12 structure that takes the shape of the letter U, body of heater 11 is provided with the natural gas line 13 for the heating furnace body inner chamber of lighting a fire, on body of heater 11, be also provided with fire-retardant gas pipeline 14, dewaxing dish 12 is provided with the de-waxing pipe 15 for being communicated with body of heater outside.De-waxing pipe 15 can drain into the wax material after melting outside body of heater 11 in time.Fire-retardant gas pipeline 14 for to the fire-retardant gas of the interior input of body of heater 11 to stop wax material ignition, fire-retardant gas is argon gas or carbon dioxide.When adopt to dodge burning dewaxing furnace module shell heated, wax material energy fast softening and can not burning.For the flue dust in body of heater is discharged in time, on body of heater, be also provided with chimney 16.In other embodiments, can also save chimney.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 dewaxing at fired mold precision casting type shell of the present invention, dodge the natural gas line burning in dewaxing furnace and can also replace with electric heater, 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 is used 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 cut cup, dewaxing mouth and the rising head of module shell, then adopt compressed air that module shell cut edge is cleaned out;
B) heating dewaxing step: 1) module shell is put into steam dewaxing stove and carried out 1～1.5 minute steam dewaxing, dewaxing pressure is 0.6MPa, 160 ± 3 ℃ of dewaxing temperatures; 2) to dodging to burn in dewaxing furnace, input fire-retardant gas, sudden strain of a muscle is burnt to dewaxing furnace and be preheated to 850 degree, then the module shell after step 1 is processed is packed fast into the high temperature carrying out 10～30 minutes in sudden strain of a muscle burning dewaxing furnace and dodge burning dewaxing (the concrete time of dewaxing determines according to module shell part dimension and structure), dewaxing temperature is 850 ± 10 ℃, and the mode of heating that dodges the employing of burning dewaxing furnace is natural gas fired heating.
The beneficial effect of the method is: 1, steam dewaxing is 1～1.5 minute, and the wax material in module shell just contacts shell position and softens and not fusing completely, and shell can not cause cracking because wax material expands; 2, through the steam dewaxing module of 1～1.5 minute put into the sudden strain of a muscle of 850 ℃ while burning dewaxing furnace because the wax material with shell contact position has been softened by steam dewaxing and had certain gap with shell, so also there will not be because the violent melting dilation of wax-pattern affects shell and occur crackle dodging in burning dewaxing process; 3, the shell surface that has taken off wax material is by the first one-step baking of 850 ℃ of high temperature, and surface, without moisture, can not cause shell surface layer back dissolving yet.
While adopting method of the present invention to dewax, module shell in dewaxing process because not producing shell surface layer back dissolving with contact with moisture; Normal temperature strength, the elevated temperature strength of module shell shell after dewaxing all can reach technological requirement; Can avoid module shell because of single steam dewaxing or dodge and burn the shell crackle that in dewaxing process, wax material melting dilation causes.
In other embodiment of the method dewaxing at fired mold precision casting type shell of the present invention, the mode of heating that dodges the employing of burning dewaxing furnace can also be electrical heating.
In other embodiment of the method dewaxing at fired mold precision casting type shell of the present invention, can also not comprise the preparation process before dewaxing.
The embodiment of dewaxing furnace is burnt in sudden strain of a muscle of the present invention, and the structure that dewaxing furnace is burnt in the sudden strain of a muscle in the embodiment of the device that the structure of this sudden strain of a muscle burning dewaxing furnace dewaxes with above-mentioned fired mold precision casting type shell is identical, thereby this partial content, and it is no longer repeated.
Claims (6)
1. the method for fired mold precision casting type shell dewaxing, is characterized in that, comprises the following steps: 1) module shell is put into steam dewaxing stove and carried out 1～1.5 minute steam dewaxing, dewaxing pressure is 0.6MPa, 160 ± 3 ℃ of dewaxing temperatures; 2) to dodging to burn in dewaxing furnace, input fire-retardant gas, sudden strain of a muscle is burnt to dewaxing furnace and be preheated to 850 degree, then the module shell after step 1 is processed is packed fast into the high temperature carrying out 10～30 minutes in sudden strain of a muscle burning dewaxing furnace and dodge burning dewaxing, dewaxing temperature is 850 ± 10 ℃, and the mode of heating that dodges the employing of burning dewaxing furnace is electrical heating or natural gas fired heating.
2. the method that fired mold precision casting type shell according to claim 1 dewaxes, it is characterized in that, also comprise the preparation process before dewaxing: lay down module shell frock, then the cup, dewaxing mouth and the rising head that cut module shell, then adopt compressed air that module shell cut edge is cleaned out.
3. a device that is exclusively used in the fired mold precision casting type shell dewaxing of the method as claimed in claim 1 implemented, 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, in body of heater, be provided with for putting the dewaxing dish of module shell, body of heater is provided with for the natural gas line of the heating furnace body inner chamber of lighting a fire or the electric heater of electric furnace intracoelomic cavity, on body of heater, be also provided with to the fire-retardant gas pipeline of inputting fire-retardant gas in body of heater, dewaxing dish be provided with for the outside de-waxing pipe being communicated with of body of heater.
4. the device of fired mold precision casting type shell dewaxing according to claim 3, is characterized in that: on body of heater, be also provided with chimney.
5. dewaxing furnace is burnt in a sudden strain of a muscle that is exclusively used in the method as claimed in claim 1 implemented, it is characterized in that: comprise body of heater, in body of heater, be provided with for putting the dewaxing dish of module shell, body of heater is provided with for the natural gas line of the heating furnace body inner chamber of lighting a fire or the electric heater of electric furnace intracoelomic cavity, on body of heater, be also provided with for input the fire-retardant gas pipeline of fire-retardant gas in body of heater, dewaxing dish is provided with the de-waxing pipe for being communicated with body of heater outside.
6. according to the sudden strain of a muscle of claim 5, burn dewaxing furnace, it is characterized in that: on body of heater, be also provided with chimney.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN103611885A true CN103611885A (en) | 2014-03-05 |
| CN103611885B CN103611885B (en) | 2015-06-17 |
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Cited By (5)
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| WO2017215127A1 (en) * | 2016-06-12 | 2017-12-21 | 蔡欲期 | Shell mold sintering method and apparatus |
| 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 |
| CN113976827A (en) * | 2021-10-29 | 2022-01-28 | 河南平原光电有限公司 | Dry-type dewaxing device and method for gypsum mold investment casting |
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| CN113976827A (en) * | 2021-10-29 | 2022-01-28 | 河南平原光电有限公司 | Dry-type dewaxing device and method for gypsum mold investment casting |
| 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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Address after: 471023 Henan Province, Luoyang city Luolong District Yuwen Kai Street No. 67 Patentee after: LUOYANG PENGQI INDUSTRIAL CO., LTD. Address before: Kaiyuan Avenue, Luolong District 471000 in Henan province Luoyang City, No. 248 Continental Mansion 818 Patentee before: LUOYANG PENGQI INDUSTRIAL CO., LTD. |