CN202438658U - Ceramic shell dewaxing device - Google Patents
Ceramic shell dewaxing device Download PDFInfo
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- CN202438658U CN202438658U CN2012200181889U CN201220018188U CN202438658U CN 202438658 U CN202438658 U CN 202438658U CN 2012200181889 U CN2012200181889 U CN 2012200181889U CN 201220018188 U CN201220018188 U CN 201220018188U CN 202438658 U CN202438658 U CN 202438658U
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Abstract
The utility model discloses a ceramic shell dewaxing device, which relates to the technical field of precision casting. The ceramic shell dewaxing device comprises a sealed cavity, wherein the sealed cavity is provided with a pressure safety valve, a steam inlet, a steam outlet and a wax outlet; and the sealed cavity is connected with a vacuumizing device. In the ceramic shell dewaxing device, the vacuumizing device is arranged, so that air existing in the sealed cavity in advance can be exhausted; and when high-pressure steam is injected into the sealed cavity subsequently, and a high-pressure steam environment is formed in the sealed cavity, all gas in the sealed cavity is steam, so that the steam amount in the sealed cavity is ensured, and sufficient heat is used for melting a wax mold; the phenomenon of cracking of a ceramic shell can be avoided, and the quality of a casting is enhanced; and steam is not exhausted, so that energy waste is reduced.
Description
Technical field
The utility model relates to precision casting process, particularly a kind of device of the shell dewaxing of making pottery.
Background technology
Hot investment casting is a kind of casting method for conventional cast technology, and it can obtain relatively accurate shape and higher casting accuracy.The technical process of hot investment casting is: at first, make wax-pattern, this wax-pattern is consistent with the product size shape of required casting; Then, form the pottery shell on the wax-pattern surface of made, subsequently; Said pottery shell is carried out dewaxing treatment (remove the wax-pattern fusing back that it is inner), last, casting metal material in the pottery shell after dewaxing treatment; After treating the metal material cooled and solidified, the said pottery shell of broken removal, the foundry goods that obtains is required product.
In the prior art; Usually adopt the mode of high steam dewaxing that the pottery shell is carried out dewaxing treatment; Shown in Figure 1ly be corresponding pottery shell dewaxing device, this pottery shell dewaxing device comprises seal chamber 1, and seal chamber 1 is provided with pressure safety valve 2, steam inlet 3, steam (vapor) outlet 4 and wax discharging port 5.When this pottery shell dewaxing device is used; The pottery shell that will have wax-pattern is earlier put into seal chamber 1 (along figure dotted arrow direction); Inject high-pressure water vapor through steam inlet 3 then; Make and form the high steam environment in the seal chamber 1, pressure safety valve 2 is used to guarantee that the pressure in the seal chamber 1 is no more than predetermined value.Can discharge a large amount of heat energy in the water vapour condensation process, this heat can make the wax-pattern fusing in the pottery shell, thereby realizes dewaxing treatment.The wax that obtains after the wax-pattern fusing can be recycled from wax discharging port 5.
The mode of above-mentioned high steam dewaxing requires the steam that provides a large amount of at short notice; To guarantee having enough heats to make wax-pattern fusing fully rapidly; Usually require 6s in the time steam pressure in the seal chamber 1 reach 5kg/cm2 (air themperature can reach 155 ℃ in the seal chamber), the whole dewaxing time is 8-12min.Time lengthening or quantity of steam are not enough; The capital can not be melted wax-pattern fully, and the wax of fusing can receive the obstruction of unfused wax and can't in time from the pottery shell, flow out, and because wax fusing back volumetric expansion; Thereby the generation of the shell spalling phenomenon that can cause making pottery influences the quality of foundry goods.
It is generally acknowledged that after the air pressure in the seal chamber 1 arrived predetermined value, quantity of steam was enough, yet this is an illusion.Owing to can be pre-existing in air in the seal chamber 1; In the high steam environment of follow-up formation, this air that is pre-existing in can occupy certain space, makes that the quantity of steam in the seal chamber 1 lacks than predicted value; Thereby cause quantity of steam not enough, be easy to generate the phenomenon of pottery shell spalling.
Need to prove that those skilled in the art are basically hoodwinked by above-mentioned illusion, fail to recognize the reason of pottery shell spalling phenomenon.It is reported; Only there is the people to be directed against above-mentioned illusion aforesaid pottery shell dewaxing device is improved, that is: on steam inlet 3 and steam (vapor) outlet 4, be provided with the temperature inductor (not shown) respectively, when sensing to seal chamber 1 in injection steam in Britain; Open steam (vapor) outlet 4 simultaneously; The air that is pre-existing in is extruded, and when sensing steam (vapor) outlet 4 just at exhaust steam, then the steam off outlet 4.
Though having overcome the air that is pre-existing in the seal chamber 1, above-mentioned improvement causes the quantity of steam defect of insufficient; But but prolonged the time of the air pressure arrival predetermined value in the seal chamber 1; Make the dewaxing time lengthening, still can produce the phenomenon of pottery shell spalling to a certain extent; And, in the process of discharging air, also discharged part steam, caused the waste of the energy.
The utility model content
The utility model provides a kind of device of the shell dewaxing of making pottery, and the generation that it can avoid making pottery shell spalling phenomenon can reduce the waste of the energy again.
For achieving the above object, the utility model adopts following technical scheme:
A kind of device of the shell dewaxing of making pottery comprises seal chamber, and said seal chamber is provided with pressure safety valve, steam inlet, steam (vapor) outlet and wax discharging port, is connected with vacuum extractor on the said seal chamber.
Preferably, said vacuum extractor comprises permanent negative pressure bucket that links to each other with said seal chamber and the vavuum pump that links to each other with said permanent negative pressure bucket.
Air pressure decrease speed per minute when preferably, the size Selection of said steam (vapor) outlet makes said seal chamber exitted in the said seal chamber is no more than 0.3kg/cm
2
Preferably, said permanent negative pressure bucket is provided with pressure sensor, and this pressure sensor links to each other with the gauge tap of vavuum pump.
Preferably, the top of said permanent negative pressure bucket is provided with pressure safety valve, and the bottom is provided with discharge outlet.
Preferably, be connected with cooler between said permanent negative pressure bucket and the vavuum pump.
Preferably, said cooler comprises water-cooled cooler and/or flow through cooler.
Preferably, said seal chamber comprise the cavity body be arranged on the closing door on the said cavity body, the periphery of said closing door is provided with o-ring groove, is provided with sealing ring in the said o-ring groove, said sealing ring is the inflatable seal circle.
In the utility model, owing to increased the step/device that vacuumizes, so can discharge the air that is pre-existing in the seal chamber; In seal chamber, inject high steam again when follow-up, and make when forming the high steam environment in the seal chamber, the gas in the seal chamber is steam all just; Thereby guaranteed the quantity of steam in the seal chamber, guaranteeing has enough heats that wax-pattern is melted fully, therefore; The utility model can avoid making pottery generation of shell spalling phenomenon; Improved the quality of foundry goods, and owing to do not have the discharge of steam, so also reduced the waste of the energy.
Description of drawings
Fig. 1 is the structural representation of pottery shell dewaxing device in the prior art;
Fig. 2 is the schematic flow sheet of the method for pottery shell dewaxing in the utility model;
Fig. 3 is the structural representation of an embodiment of device of the pottery shell dewaxing of the utility model;
Fig. 4 is the structural representation of another embodiment of device of the pottery shell dewaxing of the utility model;
Fig. 5 is the Facad structure sketch map of this door after closing door is opened on the device of the pottery shell dewaxing of the utility model.
The specific embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 2, the utility model provides a kind of method of the shell dewaxing of making pottery, and comprising:
Step S1: the pottery shell that will have wax-pattern is put into seal chamber;
Step S2: said seal chamber is vacuumized;
Step S3: inject high steam in the seal chamber after said vacuumizing, make the air pressure in the said seal chamber arrive predetermined value at the appointed time, and then finally realize the dewaxing of pottery shell.
The method of the utility model is on the basis of existing method, has increased the step (being step S2) that seal chamber is vacuumized, and wherein step S1 is identical with existing step with S3.The utility model has been owing to increased the step that vacuumizes, thus can discharge the air that is pre-existing in the seal chamber, when the follow-up high steam that in seal chamber, injects again; And make when forming the high steam environment in the seal chamber, the gas in the seal chamber is steam all just, thereby has guaranteed the quantity of steam in the seal chamber; Assurance has enough heats that wax-pattern is melted fully; Therefore, the utility model can avoid making pottery generation of shell spalling phenomenon has improved the quality of foundry goods; And owing to do not have the discharge of steam, so also reduced the waste of the energy.
The utility model has also brought an extra advantage; That is exactly: after seal chamber was vacuumized, air drag can reduce in the pottery shell, after in seal chamber, injecting steam; Steam can more promptly see through the pottery shell; Improve the burn-off rate of wax-pattern, thereby also guaranteed the quality of pottery shell, improved the quality of foundry goods.
In order more promptly to realize seal chamber is vacuumized; Avoid simultaneously vacuumizing for a long time to enhance productivity the pottery shell is caused potential harmful effect; Above-mentioned steps S2 preferably links to each other a permanent negative pressure bucket with seal chamber, when needs vacuumize, both are communicated with get final product.
And the method for the utility model preferably also comprises after step S3:
Step S4: after wax-pattern melts fully, said seal chamber is exitted, control venting speed makes the air pressure decrease speed per minute in the said seal chamber be no more than 0.3kg/cm
2
Step S5: after venting finishes, from said seal chamber, take out the pottery shell after dewaxing.
In the prior art, after wax-pattern fusing, all be after opening steam (vapor) outlet earlier and exitting fast, to take out the pottery shell again.Yet the inventor is through concentrating on studies discovery, and venting can make the surface layer of pottery shell that the risk of peeling off is arranged fast; For this reason; Need slowly venting, good more more slowly, however general as long as control venting speed makes the air pressure decrease speed per minute in the said seal chamber be no more than 0.3kg/cm
2, the problem that the shell surface layer of can avoiding making pottery peels off.Requirement to this venting speed; Can realize through the size of appropriate design steam (vapor) outlet; And a plurality of steam (vapor) outlets can be set on seal chamber; Each steam (vapor) outlet adopts no caliber size, like 1.5 cun, 1 cun and 0.5 cun etc., is beneficial to operating personnel and selects different venting speed as required.
Corresponding with the method for above-mentioned pottery shell dewaxing; The utility model also provides a kind of pottery shell dewaxing device; As shown in Figure 3; Comprise seal chamber 31, seal chamber 31 is provided with pressure safety valve 32, steam inlet 33, steam (vapor) outlet 34 and wax discharging port 35, is connected with vacuum extractor 36 on the seal chamber 31.
When the pottery shell dewaxing device of the utility model is used; The pottery shell that will have wax-pattern is earlier put into seal chamber 31; Utilize 36 pairs of seal chambers 31 of vacuum extractor to vacuumize again; Inject high steam then in the seal chamber after vacuumizing 31, make the air pressure in the seal chamber 31 arrive predetermined value at the appointed time, and then finally realize the dewaxing of pottery shell.
The utility model has been owing to increased vacuum extractor 36, thus can discharge the air that is pre-existing in the seal chamber 31, when follow-up injection high steam to seal chamber 31 in again; And make when forming the high steam environment in the seal chamber 31, the gas in the seal chamber 31 is steam all just, thereby has guaranteed the quantity of steam in the seal chamber 31; Assurance has enough heats that wax-pattern is melted fully; Therefore, the utility model can avoid making pottery generation of shell spalling phenomenon has improved the quality of foundry goods; And owing to do not have the discharge of steam, so also reduced the waste of the energy.In addition, the utility model can also make steam more promptly see through the pottery shell, has improved the burn-off rate of wax-pattern, thereby has also guaranteed the quality of pottery shell, has improved the quality of foundry goods.
In the utility model, all magnetic valve can be set on steam inlet 33, steam (vapor) outlet 34 and the wax discharging port 35, to control, magnetic valve preferably adopts the ball-and-spigot motor-driven valve, this valve steady quality, and fault rate is low.Wax discharging port 35 can also adopt the manual ball valve structure.
After adopting permanent negative pressure bucket 361, can make seal chamber 31 become vacuum state in the time, and when follow-up injection steam, seal chamber 31 is heated up rapidly and reach required quantity of steam, thereby realize dewaxing more quickly, in high quality at 1s.This sentences concrete data and compares explanation: traditionally, if in seal chamber injection pressure 7kg/cm
2The steam that temperature is 174 ℃, then air themperature 2.5s can reach 130 ℃ in the seal chamber, and this moment, the seal chamber internal pressure was 2.5kg/cm
2, and use device of the present invention, same injection pressure 7kg/cm
2The steam that temperature is 174 ℃, then air themperature 2.5s can reach 145 ℃ (being higher than traditional device) in the seal chamber, and this moment, the seal chamber internal pressure was 2kg/cm
2Because the utility model can be discharged the air that is pre-existing in the seal chamber fully, and seal chamber is in vacuum state before injecting steam, therefore; Compare with conventional art; The utility model can make more quickly in the seal chamber and heat up (moment low-voltage high-temperature), and guarantees that enough quantity of steams are arranged, because the saving of time here; So the utility model can access higher-quality pottery shell, and then obtain higher-quality foundry goods.
Realize that for ease permanent negative pressure bucket 361 keeps the certain negative pressure value automatically; Preferably on permanent negative pressure bucket 361, the pressure sensor (not shown) is set; This pressure sensor links to each other with the gauge tap of vavuum pump 362, and when the air pressure in the permanent negative pressure bucket 361 was lower than required negative pressure value, pressure sensor can send signal to the gauge tap of vavuum pump 362; Start vavuum pump 362, make the air pressure in the permanent negative pressure bucket 361 revert to required negative pressure value.
After use after a while, can produce ponding in the permanent negative pressure bucket 361, for this ponding is discharged, the bottom of permanent negative pressure bucket 361 can also be provided with discharge outlet 364.Simultaneously; In order to prevent that the magnetic valve between permanent negative pressure bucket 361 and the seal chamber 31 from breaking down; Cause becoming high pressure in the permanent negative pressure bucket 361, and then damage vavuum pump 362, preferably the pressure safety valve 3611 that one less pressure can trigger work is set on permanent negative pressure bucket 361 tops.In addition, two magnetic valves are set preferably between permanent negative pressure bucket 361 and the seal chamber 31, the switch control when one of them is used as operate as normal, another is as subsequent use, to improve security.
In the use of pottery shell dewaxing device; Seal chamber 31 inner air are high temperature air, and this high temperature air is prone to cause vacuum extractor 36 faults, influences the life-span of vacuum extractor 36; For avoiding this problem; Preferably, as shown in Figure 4, between permanent negative pressure bucket 361 and vavuum pump 362, be connected with cooler 363.Cooler 363 can comprise water-cooled cooler and/or flow through cooler.In this Fig. 4, both connected water-cooled cooler 3631, connected flow through cooler 3632 again.Water-cooled cooler 3631 (not shown) that can link to each other with suction pump, cooling tower; Flow through cooler 3632 can comprise bend pipe and fan; The concrete structure of water-cooled cooler and flow through cooler can adopt and well known to a person skilled in the art and arbitrary structures repeat no more here.
In the utility model, the sealing means of seal chamber and prior art are also different.Seal chamber 31 comprises the cavity body and is arranged on the closing door on the cavity body; As shown in Figure 5; The utility model is that the periphery at closing door 312 is provided with o-ring groove 313, is provided with sealing ring 314 in the o-ring groove 313, and sealing circle 314 is the inflatable seal circle.During use, after closing closing door 312, in inflatable seal circle 314, pour gases at high pressure, thus sealing ring 314 heave, play sealing function; After the dewaxing of pottery shell finishes, discharge the gas in the sealing ring 314, open closing door 312 then, take out the pottery shell.Mostly sealing ring is packing ring in the prior art, can produce friction with the cavity body, influences the life-span of sealing ring, and the utility model adopts inflatable seal circle 314, can reduce the friction between sealing ring and the cavity body, the service life of improving sealing ring greatly.
The above is merely the preferable of the utility model, is not the practical range that is used for limiting the utility model; If do not break away from the spirit and the scope of the utility model, the utility model is made amendment or is equal to replacement, all should be encompassed in the middle of the protection domain of the utility model claim.
Claims (8)
1. the device of shell dewaxing of making pottery comprises seal chamber, and said seal chamber is provided with pressure safety valve, steam inlet, steam (vapor) outlet and wax discharging port, it is characterized in that, is connected with vacuum extractor on the said seal chamber.
2. based on the described device of claim 1, it is characterized in that said vacuum extractor comprises permanent negative pressure bucket that links to each other with said seal chamber and the vavuum pump that links to each other with said permanent negative pressure bucket.
3. device according to claim 1 is characterized in that, the air pressure decrease speed per minute the when size Selection of said steam (vapor) outlet makes said seal chamber exitted in the said seal chamber is no more than 0.3kg/cm
2
4. device according to claim 2 is characterized in that, said permanent negative pressure bucket is provided with pressure sensor, and this pressure sensor links to each other with the gauge tap of vavuum pump.
5. device according to claim 2 is characterized in that the top of said permanent negative pressure bucket is provided with pressure safety valve, and the bottom is provided with discharge outlet.
6. device according to claim 2 is characterized in that, is connected with cooler between said permanent negative pressure bucket and the vavuum pump.
7. device according to claim 6 is characterized in that said cooler comprises water-cooled cooler and/or flow through cooler.
8. according to the described device of arbitrary claim in the claim 2 to 7; It is characterized in that; Said seal chamber comprises the cavity body and is arranged on the closing door on the said cavity body; The periphery of said closing door is provided with o-ring groove, is provided with sealing ring in the said o-ring groove, and said sealing ring is the inflatable seal circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200181889U CN202438658U (en) | 2012-01-13 | 2012-01-13 | Ceramic shell dewaxing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200181889U CN202438658U (en) | 2012-01-13 | 2012-01-13 | Ceramic shell dewaxing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202438658U true CN202438658U (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200181889U Expired - Fee Related CN202438658U (en) | 2012-01-13 | 2012-01-13 | Ceramic shell dewaxing device |
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| CN (1) | CN202438658U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554126A (en) * | 2012-01-13 | 2012-07-11 | 蔡欲期 | Method and device for dewaxing of ceramic shell |
| WO2017215128A1 (en) * | 2016-06-12 | 2017-12-21 | 蔡欲期 | Method and apparatus for ceramic shell dewaxing |
-
2012
- 2012-01-13 CN CN2012200181889U patent/CN202438658U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554126A (en) * | 2012-01-13 | 2012-07-11 | 蔡欲期 | Method and device for dewaxing of ceramic shell |
| WO2017215128A1 (en) * | 2016-06-12 | 2017-12-21 | 蔡欲期 | Method and apparatus for ceramic shell dewaxing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120919 Termination date: 20200113 |
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| CF01 | Termination of patent right due to non-payment of annual fee |