CN112439875A - Depoling equipment and depoling method of water-soluble wax core - Google Patents
Depoling equipment and depoling method of water-soluble wax core Download PDFInfo
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- CN112439875A CN112439875A CN202011172313.7A CN202011172313A CN112439875A CN 112439875 A CN112439875 A CN 112439875A CN 202011172313 A CN202011172313 A CN 202011172313A CN 112439875 A CN112439875 A CN 112439875A
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- core
- depoling
- wax
- temperature
- decoring
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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
- B22C9/043—Removing the consumable pattern
Abstract
The invention relates to a depoling device and a depoling method of a water-soluble wax core. A decoring apparatus comprising: the core removing groove, the ultrasonic transducer connected with the core removing groove, the ultrasonic generator matched with the ultrasonic transducer, the thermocouple arranged in the core removing groove, and the controller respectively connected with the thermocouple and the ultrasonic generator, wherein the controller is used for: controlling the ultrasonic generator to be closed after the thermocouple detects that the temperature of the core removing groove exceeds the preset temperature; and the breather pipe is arranged in the core-removing groove, one end of the breather pipe is communicated with the outside of the core-removing groove through a gas compression pump, and a plurality of through holes are formed in the part of the breather pipe, which is positioned in the core-removing groove. The core removing method comprises the following steps: putting the wax film to be depoling in a depoling liquid, carrying out ultrasonic treatment, and simultaneously introducing compressed bubbles into the depoling liquid until the wax core in the wax film is completely dissolved; and in the ultrasonic treatment process, if the temperature of the depoling liquid is higher than 25 ℃, stopping the ultrasonic treatment. The invention greatly increases the depoling efficiency and can ensure the stable temperature of the liquid in the tank.
Description
Technical Field
The invention relates to the technical field of wax film manufacturing, in particular to a depoling device and a depoling method of a water-soluble wax core.
Background
The water-soluble wax is a special wax material used in precision casting industry, generally consists of one or more wax particles (such as animal wax, plant wax, petrochemical wax, synthetic wax and the like) which are insoluble in water and have the size of less than 1 mu m and water-soluble weak acid salt (such as sodium polyacrylate, sodium alginate and the like) which is filled in the middle of the wax particles and serves as a binder, is used for forming a wax mold with a complex inner cavity structure, and reduces the difficulty of mold design. Using a water-soluble waxIt is necessary to form a water soluble wax core using water soluble wax injection and then place the water soluble wax core in a mold and inject the final wax pattern. And then the wax mould wrapped with the water-soluble wax core is placed in a solution containing citric acid or dilute hydrochloric acid to dissolve and remove the water-soluble wax core, and finally the final wax mould body is obtained. During the dissolving process of the water-soluble wax core, H in the depoling acid solution is consumed+The dissolving speed is gradually reduced, so that the dissolving liquid is stirred to ensure the H of the accessory of the water-soluble wax core+The concentration is critical to the decoring efficiency. The water-soluble wax core has different sizes according to the size and the contact area with the solvent, and the dissolving time can be varied from several hours to more than ten hours, thereby seriously influencing the production efficiency.
The ultrasonic wave is a sound wave with the frequency higher than 20000Hz, has the characteristics of good directivity, strong penetrating power, easy acquisition of concentrated sound energy, long propagation distance in water and the like, and is widely applied to medicine, military, industry and agriculture. The ultrasonic cleaning is to utilize the cavitation of ultrasonic wave in liquid to make the cleaned matter produce vibration and stripping, so that the contaminated layer is dispersed, emulsified and stirred to reach the cleaning purpose. Ultrasonic wave can impel the water-soluble wax granule of dissolving to break away from the body, improves desorption efficiency. However, the liquid in the cleaning tank is heated up due to the long-time work of the ultrasonic generator, and the dimensional stability of the wax mold in the tank is affected.
Therefore, the invention is especially provided.
Disclosure of Invention
The first purpose of the invention is to provide a depoling device which can be used for depoling water-soluble wax cores, greatly increases depoling efficiency by increasing ultrasonic waves and bubble stirring, and has a temperature control function to ensure the temperature of liquid in a tank to be stable, thereby ensuring the size stability of a wax mould by multiple measures.
The invention also aims to provide a depoling method of the water-soluble wax core, which adopts two stirring measures of ultrasonic wave and bubbles to promote the dissolution of the wax core, greatly improves the depoling efficiency, and simultaneously controls the temperature in the ultrasonic process to avoid overhigh temperature so as to ensure the stable size of the wax mould.
In order to achieve the above purpose, the invention provides the following technical scheme:
a decoring apparatus comprising:
a core-removing groove is arranged on the upper surface of the core-removing groove,
an ultrasonic transducer connected with the depoling groove,
an ultrasonic generator matched with the ultrasonic transducer,
a thermocouple arranged in the core-pulling-off groove,
a controller connected to the thermocouple and the sonotrode, respectively, the controller being configured to: after the thermocouple detects that the temperature of the core removing groove exceeds a preset temperature, the ultrasonic generator is controlled to be closed;
and the breather pipe is arranged in the core-removing groove, one end of the breather pipe is communicated with the outside of the core-removing groove through a gas compression pump, and a plurality of through holes are formed in the part of the breather pipe, which is positioned in the core-removing groove.
This equipment of depoling can be used to water-soluble wax core depoling, has increased depoling efficiency by a wide margin through increasing ultrasonic and bubble stirring, has the control by temperature change function simultaneously, can guarantee that inslot liquid temperature is stable, therefore guarantees the wax matrix size stability through multiple measure, and its theory of operation as follows.
A core removing liquid (usually, depending on the material of the wax core, for example, citric acid or a dilute hydrochloric acid solution is usually used for water-soluble wax cores) is injected into the core removing groove, and then the wax film containing the water-soluble wax cores is placed in the core removing groove. And then, starting an ultrasonic generator to enable an ultrasonic transducer to work to generate ultrasonic waves, and simultaneously introducing compressed air into the vent pipe by using a gas compression pump, so that bubbles overflow from the depoling liquid of the depoling groove, and the depoling liquid accelerates the dissolution of the wax core under the double stirring action of the ultrasonic waves and the compressed bubbles, thereby efficiently removing the wax core. In the process, a temperature upper limit is set according to the high temperature resistance of the wax film, and when the thermocouple detects that the temperature of the core-removing groove exceeds a preset temperature, the ultrasonic generator is controlled to be turned off, so that the wax film is always in a safe temperature range, and the size stability of the wax film is ensured.
Therefore, the depoling device not only improves depoling efficiency, but also ensures the stable size of the wax film.
In some preferred embodiments, the vent pipe is distributed in a zigzag or circuitous manner in the core-removing groove.
Therefore, the distribution density of the water pipe in the core removing groove can be improved, so that the generation amount of bubbles is increased, and the rapid dissolution is promoted.
In some preferred embodiments, the vent pipe is located at the bottom of the decorticating tank. The breather pipe sets up the convenient placement of wax matrix in the bottom.
In some preferred embodiments, a circulating cooling water pipe is further arranged in the core removing groove, and the cooling water pipe is connected with a water pump.
When the temperature in the core removing groove is higher than the preset temperature, the cooling water circulation can be started to quickly cool.
In some preferred embodiments, the draining device further comprises a draining basket, the draining basket can be placed in the core removing groove, and a plurality of draining holes are formed in the side wall of the draining basket.
The arrangement of the draining basket facilitates the placement and the taking out of the wax film, so that the wax film is conveniently taken from the depoling groove and damaged.
In some preferred embodiments, the water pump is connected to the controller, and the controller is further configured to: and after the thermocouple detects that the temperature of the core removing tank is lower than a preset temperature, the water pump is controlled to be closed.
Therefore, the temperature treatment of the coring tank can be ensured to be in a more proper range, and the rapid dissolution is facilitated.
The invention also provides a decoring method of the water-soluble wax core, which comprises the following steps:
placing a wax film to be depocessed in a depocessing solution, carrying out ultrasonic treatment, and simultaneously introducing compressed bubbles into the depocessing solution until the wax core in the wax film is completely dissolved; and in the ultrasonic treatment process, if the temperature of the depoling liquid is higher than 25 ℃, stopping the ultrasonic treatment.
In the above method, a core removing solution (typically, the core removing solution is mainly an acid solution) is used to chemically react with a weak acid salt serving as a binder in the water-soluble wax component to form a weak acid and a strong acid salt which are dissolved in water, so as to accelerate the dissolution of the water-soluble wax core. In addition, ultrasonic waves and pneumatic stirring are added, the movement of the molecules of the depoling liquid is intensified through the ultrasonic waves, the dropping of micron wax particles in the water-soluble wax core is accelerated, and particularly, the high depoling efficiency is kept for a narrow inner cavity area with a poor conventional mechanical or bubble stirring effect. Simultaneously, in order to avoid the depoling liquid temperature rise that ultrasonic wave mechanical shock leads to, guarantee that the temperature of depoling liquid keeps invariable through placing condenser tube inside the depoling liquid, guaranteed the intensity of wax matrix in the depoling liquid, avoided it to take place to warp at the depoling in-process.
Therefore, the method also adopts two stirring measures of ultrasonic waves and bubbles to promote the dissolution of the wax core, greatly improves the depoling efficiency, and simultaneously controls the temperature in the ultrasonic process to avoid overhigh temperature, thereby ensuring the stable size of the wax mould.
In some preferred embodiments, the process conditions of the ultrasonic treatment are: 40000HZ, 300-500W.
In some preferred embodiments, the pressure of the compressed bubbles is 0.4 to 0.6MPa, and the gas flow rate is 0.01 to 0.1m 3/s.
In some preferred embodiments, the method further comprises: and if the temperature of the depoling liquid is higher than 25 ℃, cooling the depoling liquid by adopting circulating cooling water.
In some preferred embodiments, after the wax film is completely dissolved in the coring solution, the wax film is taken out, cleaned by clean water for 1-5 minutes, and then the surface moisture of the wax film is dried by using compressed air.
In some preferred embodiments, the decoring solution is an aqueous solution of nitric acid, citric acid, or hydrochloric acid.
In some preferred embodiments, the concentration of the acid in the decoring solution is between 10% and 30%.
In summary, compared with the prior art, the invention achieves the following technical effects:
(1) the core removing efficiency is improved;
(2) ensuring the stable size of the wax film.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a front view of a decoring apparatus provided by the present invention;
FIG. 2 is a perspective view of a decoring apparatus provided by the present invention;
FIG. 3 is a perspective view of a coring slot provided by the present invention;
FIG. 4 is a top view of a coring slot provided by the present invention;
FIG. 5 is a schematic view of a wax film containing a water soluble wax core according to the present invention;
FIG. 6 is a schematic illustration of the wax film of FIG. 5 after depoling;
FIG. 7 is the flexural strength of the wax film at different temperatures and strength loss compared to 20 ℃;
reference numerals:
1-a core-removing groove, 2-an ultrasonic transducer, 3-a thermocouple, 4-an ultrasonic generator, 5-a controller, 6-a water pump, 7-a cooling water pipe, 8-a vent pipe and 9-a draining basket.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The raw materials, reagents or instruments used are not indicated by manufacturers, and all the raw materials, the reagents or the instruments are conventional products which can be obtained by commercial purchase or can be prepared according to the prior art.
In one embodiment of the present invention, there is provided a decoring apparatus, as shown in fig. 1 to 4, comprising:
the core-removing groove (1) is provided with a core-removing groove,
an ultrasonic transducer 2 connected with the core-releasing groove 1,
an ultrasonic generator 4 matched with the ultrasonic transducer 2,
a thermocouple 3 arranged in the core-pulling groove 1,
a controller 5 connected to the thermocouple 3 and the ultrasonic generator 4, respectively, the controller 5 being configured to: after the thermocouple 3 detects that the temperature of the core removing groove 1 exceeds a preset temperature, the ultrasonic generator 4 is controlled to be closed;
and the breather pipe 8 is arranged in the core-removing groove 1, one end of the breather pipe 8 is communicated with the outside of the core-removing groove 1, and a plurality of through holes are arranged on the part of the breather pipe 8, which is positioned in the core-removing groove 1.
This equipment of depoling can be used to water-soluble wax core depoling, has increased depoling efficiency by a wide margin through increasing ultrasonic and bubble stirring, has the control by temperature change function simultaneously, can guarantee that inslot liquid temperature is stable, therefore guarantees the wax matrix size stability through multiple measure, and its theory of operation as follows.
A core removing liquid (usually, depending on the material of the wax core, for example, citric acid or a dilute hydrochloric acid solution is usually used for a water-soluble wax core) is injected into the core removing tank 1, and then the wax film containing the water-soluble wax core is placed in the core removing tank 1. And then, the ultrasonic generator 4 is started to enable the ultrasonic transducer 2 to work to generate ultrasonic waves, and air (preferably compressed air) is introduced into the vent pipe 8, so that bubbles overflow from the depoling liquid of the depoling tank 1, and the depoling liquid accelerates the dissolution of the wax cores under the double stirring action of the ultrasonic waves and the bubbles, thereby efficiently removing the wax cores. In the process, a temperature upper limit is set according to the high temperature resistance of the wax film, and when the thermocouple 3 detects that the temperature of the core removing groove 1 exceeds a preset temperature, the ultrasonic generator 4 is controlled to be turned off, so that the wax film is always in a safe temperature range, and the size stability of the wax film is ensured.
Therefore, the depoling equipment not only improves depoling efficiency, but also ensures the stable size of the wax film.
In other embodiments, the shape and structure of the ventilation pipe 8 can be further improved. For example:
in some preferred embodiments, the ventilation pipes 8 may be distributed in a zigzag or winding manner in the core-removing tank 1, such as the ventilation pipes 8 in fig. 4, and may also be in a spiral shape, a zigzag shape, etc., for the purpose of increasing the distribution density of the water pipes in the core-removing tank 1, thereby increasing the amount of generated air bubbles and promoting the rapid dissolution.
The vent pipe 8 can be positioned at the bottom in the core-removing groove 1. The breather pipe 8 is arranged at the bottom to facilitate the placement of the wax film.
Alternatively, the vent pipe 8 is provided on the side wall of the coring tank 1.
In some preferred embodiments, a gas compression pump is connected to one end of the vent pipe 8, which communicates the coring tank 1 with the outside.
The compressed gas can generate larger mechanical energy, thereby increasing the stirring force.
In other embodiments, can also add condenser tube 7, can rapid cooling when taking off core liquid temperature too high, specifically be:
in some preferred embodiments, a circulating cooling water pipe 7 is further arranged in the core removing tank 1, and a water pump 6 is connected to the cooling water pipe 7.
When the temperature in the depoling groove 1 is higher than the preset temperature, the cooling water circulation can be started to quickly cool.
In some preferred embodiments, the water pump 6 is connected to the controller 5, and the controller 5 is further configured to: and after the thermocouple 3 detects that the temperature of the core removing groove 1 is lower than a preset temperature, the water pump 6 is controlled to be closed so as to avoid the over-low temperature of the core removing liquid in the core removing groove 1.
In other embodiments, a draining basket 9 may be additionally arranged, the draining basket 9 may be placed in the decoring tank 1, and a plurality of draining holes are arranged on the side wall of the draining basket 9. The arrangement of the draining basket 9 facilitates the placement and the taking out of the wax film, so that the wax film is damaged by the wax film taken out of the depoling groove 1.
In some embodiments, the shapes of the coring tank 1 and the drain basket 9 are arbitrary as long as they match the wax film shape.
In some embodiments, the connection position of the ultrasonic transducer 2 and the core-breaking groove 1 is arbitrary, for example, typical connection is as follows: an ultrasonic transducer 2 is arranged on the outer wall of the bottom of the depoling groove 1.
In some embodiments, the number of thermocouples 3 provided is arbitrary.
The invention also provides an embodiment of the depoling process, which is completed based on the equipment shown in the figures 1 to 4, and the specific process is as follows.
Examples 1 to 12
Preparing a coring solution, diluting citric acid, hydrochloric acid or nitric acid with water to obtain the coring solution, and pouring the coring solution into a coring tank;
secondly, placing a wax film (model: SL-260) in a draining basket, wherein the structure of the wax film before depoling is shown in figure 5, placing the wax film in a depoling tank, starting an ultrasonic generator and a gas compression pump, carrying out ultrasonic stirring and bubble stirring (different embodiments can selectively adopt different measures, and the specific conditions are shown in table 1), and controlling the temperature in the process to achieve constant-temperature depoling; if the temperature of the core removing liquid is too high (set to be 25 ℃), turning off the ultrasonic waves, and simultaneously turning on a water pump of a cooling water pipe for cooling, and when the temperature of the water is lower than the lower limit (set to be 19 ℃), turning off the water pump, wherein the temperature of the cooling water is preferably set to be 16-18 ℃.
And thirdly, after the wax core in the wax film is completely dissolved, taking out the draining basket, taking out the wax film, cleaning the wax film for 1-5 minutes by using water, then drying the surface moisture of the wax film by using compressed air, wherein the structure of the depoling wax film is as shown in figure 6, and a cavity is reserved inside the depoling wax film.
Examples 1 to 12 were different in stirring means, formulation of the core removing solution, cooling water temperature, etc., and the obtained core removing results are shown in table 1.
TABLE 1
The present inventors also examined the change of the bending strength of the wax film at different temperatures in the above examples, and as shown in FIG. 7 and Table 2, the bending strength of the model wax decreased rapidly with temperature, and the three-point bending strength at 35 ℃ decreased by 60% as compared with that at 20 ℃. And when the temperature reaches 45 ℃, the model wax loses the strength completely and begins to deform and bend under the dead weight, so the temperature of the depoling liquid is kept constant with the storage time of the wax mould.
TABLE 2
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A decoring apparatus, comprising:
a core-removing groove is arranged on the upper surface of the core-removing groove,
an ultrasonic transducer connected with the depoling groove,
an ultrasonic generator matched with the ultrasonic transducer,
a thermocouple arranged in the core-pulling-off groove,
a controller connected to the thermocouple and the sonotrode, respectively, the controller being configured to: after the thermocouple detects that the temperature of the core removing groove exceeds a preset temperature, the ultrasonic generator is controlled to be closed;
and the breather pipe is arranged in the core-removing groove, one end of the breather pipe is communicated with the outside of the core-removing groove through a gas compression pump, and a plurality of through holes are formed in the part of the breather pipe, which is positioned in the core-removing groove.
2. The decortication apparatus of claim 1, wherein the vent tubes are arranged in a zigzag or circuitous pattern within the decortication groove.
3. A decortication apparatus as claimed in claim 1 or claim 2, wherein the vent pipe is located at the base of the decortication chamber.
4. The decorticating apparatus according to claim 1, wherein a circulating cooling water pipe is further provided in the decorticating tank, and the cooling water pipe is connected with a water pump.
5. The decoring apparatus of claim 1, further comprising a draining basket positionable within the decoring tank and having a plurality of draining holes in a sidewall thereof.
6. The decoring apparatus of claim 5, wherein the water pump is connected to the controller, the controller further configured to: and after the thermocouple detects that the temperature of the core removing tank is lower than a preset temperature, the water pump is controlled to be closed.
7. A method of decoring a water-soluble wax core, comprising:
placing a wax film to be depocessed in a depocessing solution, carrying out ultrasonic treatment, and simultaneously introducing compressed bubbles into the depocessing solution until the wax core in the wax film is completely dissolved; and in the ultrasonic treatment process, if the temperature of the depoling liquid is higher than 25 ℃, stopping the ultrasonic treatment.
8. The decoring method according to claim 7, wherein the process conditions of the ultrasonic treatment are: 40000HZ, 300-500W;
preferably, the pressure of the compressed bubbles is 0.4-0.6 Mpa, and the gas flow rate is 0.01-0.1 m3/s。
9. The decoring method of claim 7, further comprising: and if the temperature of the depoling liquid is higher than 25 ℃, cooling the depoling liquid by adopting circulating cooling water.
10. The decoring method according to claim 7, wherein the decoring liquid is an aqueous solution of nitric acid, citric acid or hydrochloric acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011172313.7A CN112439875A (en) | 2020-10-28 | 2020-10-28 | Depoling equipment and depoling method of water-soluble wax core |
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| CN202011172313.7A CN112439875A (en) | 2020-10-28 | 2020-10-28 | Depoling equipment and depoling method of water-soluble wax core |
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| CN114309473A (en) * | 2022-01-24 | 2022-04-12 | 洛阳科品实业有限公司 | Hollow wax mold dewaxing process containing water-soluble wax core |
| CN114377594A (en) * | 2022-01-24 | 2022-04-22 | 洛阳科品实业有限公司 | Decoring system for soluble core |
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| CN114309473A (en) * | 2022-01-24 | 2022-04-12 | 洛阳科品实业有限公司 | Hollow wax mold dewaxing process containing water-soluble wax core |
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Address after: No. 5 Yongxiang North Road, Haidian District, Beijing 100094 Applicant after: Beijing Aviation Materials Research Institute Co.,Ltd. Address before: No. 5 Yongxiang North Road, Haidian District, Beijing 100094 Applicant before: Beijing Aeronautical Materials Research Institute Co.,Ltd. |
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Application publication date: 20210305 |