CN102896306A - Process for accelerating core removal speed by utilizing liquid-electric effect and special high-temperature high-pressure core removal kettle - Google Patents
Process for accelerating core removal speed by utilizing liquid-electric effect and special high-temperature high-pressure core removal kettle Download PDFInfo
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- CN102896306A CN102896306A CN201210390857XA CN201210390857A CN102896306A CN 102896306 A CN102896306 A CN 102896306A CN 201210390857X A CN201210390857X A CN 201210390857XA CN 201210390857 A CN201210390857 A CN 201210390857A CN 102896306 A CN102896306 A CN 102896306A
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Abstract
The invention discloses a process for accelerating a core removal speed by utilizing a liquid-electric effect. A corrosion removal process of a mold core of a cast part and a washing process of an inner cavity of the cast part are proceeded at the same time, namely, under a set temperature and pressure environment, a high-voltage pulse current is applied to a liquid corrosion medium without interruption at intervals, the liquid corrosion medium is quickly vaporized or expanded or generate a shock wave or a cavity by the liquid-electric effect, the mold core of the cast part is carried out chemical corrosion reaction and physical erosion, a corroded product flows out of a mold cavity of the cast part, and a new mold core corrosion interface of the cast part is formed in the mold cavity of the cast part without interruption so as to accelerate the removal speed of the mold core of the cast part. The invention further discloses a high-temperature high-pressure core removal kettle with the liquid-electric effect. An electrode is arranged above the cast part; a bottom end of the electrode is also soaked in a corrosion liquid pool; the electrode is not in contact with the cast part loaded in a material frame; a top end of the electrode is connected with a high-voltage pulse power supply; the corrosion liquid pool is grounded; and the high-voltage pulse power supply is controlled to apply the high-voltage pulse current to the corrosion liquid pool without interruption at intervals.
Description
Technical field
The present invention relates to a kind of precision-investment casting ceramic core removing process and device thereof, particularly relate to technique and device thereof that a kind of HTHP removes ceramic core.
Background technology
Development along with the model casting technology, foundry goods with complicated shape inner chamber occurs in a large number, yet the inner chamber of large amount of complex need to form with core, core is divided into core and ceramic core, the intensity of core is lower, the surface roughness that forms core cavity is larger, but core just can remove with mechanical oscillation, at present only for large-scale sand-cast.Ceramic core is used for the hollow blade of a large amount of small-sized foundry goods, especially engines that the die cavity inner surface is had relatively high expectations.The intensity of ceramic core is higher, corrosion-resistant better, present complicated ceramic core remove the method for nearly all using caustic corrosion, etching time is longer, tens hours at least, hundreds of was individual hour at most, so ceramic core removes the important step that becomes the application of restriction ceramic core.
In order to solve removing of ceramic core, researchers have carried out a large amount of research, utilize HTHP to accelerate ceramic corrosion reaction speed, have invented HTHP soda boiling technique.Utilize this technique basically to solve silica-based ceramic core and remove problem, realize extensive explained hereafter, yet still need tens to hundreds of hour for aluminium base core.In order further to accelerate the speed that removes of core, report that Russia adopts ultrasonic wave to come the accelerated reaction process, use in the high temperature yet ultrasonic wave is very difficult, so this technology yet there are no for industrial production at present at home again.The research of making a general survey of forefathers can draw, and the researcher attempts to accelerate removing of core by improving corrosive environment always, yet does not carry out conscientious consideration for corrosion interface.Because ceramic core generally is used to form complicated small-sized inner chamber, the inner chamber of small complex is unfavorable for the infiltration of fresh alkali lye, ceramic particle after the corrosion is not easy again to flow out from the little die cavity of complexity, die cavity is darker, shape is more complicated, the aperture is less, more be not easy to flow out, arrive at corrosion interface with regard to having checked fresh alkali lye like this, corrosion also just stops, people clean the method reenter the stove corrosion after by blowing out makes alkali lye arrive at the interface, so back and forth repeatedly several times, cause corroding depoling for up to more than 20 days.
The High Voltage electric field because huge energy abrupt release in discharge channel, causes the above high temperature of several ten thousand degree and several thousand pressure that atmospheric pressure is above, makes the liquid in the passage vaporize rapidly, expand, produce shock wave and acoustic cavitation by liquid.Here it is so-called electrohydraulic effect, electrohydraulic effect have been widely used in the various fields such as liquid electrical forming, the sand removal of liquid electricity, oil exploitation.Also report useless is applied to electrohydraulic effect in the ceramic core subtractive process at present.
Summary of the invention
In order to solve the prior art problem, the object of the invention is to overcome the defective that prior art exists, provide a kind of electrohydraulic effect that utilizes to accelerate technique and special-purpose electrohydraulic effect HTHP depoling still thereof that depoling removes speed, accelerate the ceramic core subtractive process by electrohydraulic effect, and be applicable to industrial production.
To achieve the above object of the invention, the present invention adopts following technical proposals:
A kind of electrohydraulic effect that utilizes accelerates the technique that depoling removes speed, the cleaning process that comprises the inner chamber of the corrosion subtractive process of core of foundry goods and foundry goods, the cleaning process of the corrosion subtractive process of the core of foundry goods and the inner chamber of foundry goods is carried out simultaneously, be: under the temperature and pressure environment of setting, constantly the gap applies high-voltage pulse current in the liquid corrosion medium, by electrohydraulic effect the liquid corrosion medium is vaporized rapidly, expand, produce shock wave or cavitation occurs, the core of foundry goods is corroded chemical reaction and physics washes away, product after the corrosion is flowed out from the die cavity of foundry goods, constantly form the core corrosion interface of new foundry goods in the die cavity of foundry goods, the core that accelerates foundry goods removes.
The current strength of the high-voltage pulse current that the present invention applies is 100～5000A, and its voltage is 1～24V.
In the corrosion subtractive process of the core of foundry goods of the present invention and in the cleaning process of the inner chamber of foundry goods, the foundry goods of core to be removed is under the pressure environment of 100～500 ℃ temperature and 0～10MPa.
The present invention also provides a kind of electrohydraulic effect that utilizes to accelerate the special-purpose electrohydraulic effect HTHP depoling still that depoling removes the technique of speed, in the depoling still, be provided with the corrosion liquid pool, load the foundry goods of core to be removed in the material frame, the foundry goods that the material frame is loaded immerses in the corrosion liquid pool fully, above foundry goods, also arrange electrode, the bottom of electrode is also immersed in the corrosion liquid pool, electrode does not contact with the interior foundry goods that loads of material frame, the top of electrode connects high-voltage pulse power source, corrosion liquid pool ground connection, the control high-voltage pulse power source constantly applies high-voltage pulse current in the gap to the corrosion liquid pool, under the temperature and pressure environment of setting, by electrohydraulic effect the liquid corrosion medium in the corrosion liquid pool is vaporized rapidly, expand, produce shock wave or cavitation occurs, the core of foundry goods is corroded chemical reaction and physics washes away, product after the corrosion is flowed out from the die cavity of foundry goods, constantly form the core corrosion interface of new foundry goods in the die cavity of foundry goods, the core that accelerates foundry goods removes.
In electrohydraulic effect HTHP depoling still of the present invention, the current strength of the high-voltage pulse current of high-voltage pulse power source output is 100～5000A, and its voltage is 1～24V.
In HTHP depoling still of the present invention, temperature is 100～500 ℃, and pressure is 0～10MPa.
The present invention has following apparent outstanding substantive distinguishing features and remarkable advantage compared with prior art:
1. the present invention utilizes electrohydraulic effect to accelerate depoling speed, removing with the cleaning of the inner chamber of foundry goods of core carried out simultaneously, constantly the gap applies high-voltage pulse current in the process that the core corrosion removes, utilize the product outflow inner chamber after electrohydraulic effect impels corrosion, constantly form fresh corrosion interface, accelerate core and remove.
2. technique of the present invention is simple and direct, and equipment is simple, is easy to realize industrial production, and cost is low, and the core removal efficiency is high.
Description of drawings
Fig. 1 is the structural representation of the electrohydraulic effect HTHP depoling still of the embodiment of the invention one.
The specific embodiment
By reference to the accompanying drawings, details are as follows to the preferred embodiments of the present invention:
Embodiment one:
Referring to Fig. 1, in the present embodiment, in electrohydraulic effect HTHP depoling still, be provided with corrosion liquid pool 4, the material frame 2 interior foundry goods 3 that load core to be removed, the foundry goods 3 that material frame 2 is loaded immerses in the corrosion liquid pool 4 fully, above foundry goods 3, also arrange electrode 1, the bottom of electrode 1 is also immersed in the corrosion liquid pool 4, electrode 1 does not contact with the foundry goods 3 of material frame 2 interior loadings, the top of electrode 1 connects high-voltage pulse power source 5, corrosion liquid pool 4 ground connection, control high-voltage pulse power source 5 constantly applies high-voltage pulse current in the gap to corrosion liquid pool 4, under the temperature and pressure environment of setting, by electrohydraulic effect the liquid corrosion medium in the corrosion liquid pool 4 is vaporized rapidly, expand, produce shock wave or cavitation occurs, the core of foundry goods 3 is corroded chemical reaction and physics washes away, the product after the corrosion is flowed out from the die cavity of foundry goods 3, constantly form the core corrosion interface of new foundry goods in the die cavity of foundry goods 3, the core that accelerates foundry goods 3 removes.In the present embodiment, the foundry goods 3 that will contain silicon-base ceramic core is packed in the material frame 2, and puts into together the corrosion liquid pool 4 of HTHP depoling still, and the liquid corrosion medium in the corrosion liquid pool 4 is alkali lye, the alkali lye composition is the mixed liquor of 20%NaOH and KOH, and wherein NaOH:KOH is 1:1.Directly over foundry goods 3, arrange electrode 1, build HTHP depoling still, the energising heating, temperature rises to 170 degrees centigrade, when pressure reaches 0.5MPa, behind the heat-insulation pressure keeping 30 minutes, connect high-voltage pulse power source 5, applied high-voltage pulse current 10 minutes, produce electrohydraulic effect, utilize the effects such as shock wave, cavitation of electrohydraulic effect to impel the corrosion product after the corrosion to flow out core cavity, form fresh corrosion interface, according to size, the complexity of core cavity, so repeatedly carry out, just can realize removing of core, greatly improve removal efficiency.
Embodiment two:
Present embodiment and embodiment one are basic identical, and special feature is:
In the present embodiment, the foundry goods that will contain the Al-base ceramic core material frame 2 of packing into, and put into together the corrosion liquid pool 4 of HTHP depoling still, the alkali lye composition is the 25%NaOH aqueous solution.Also directly over foundry goods 3, arrange electrode 1, build HTHP depoling still, the energising heating, rise to 200 degrees centigrade to temperature, when pressure reaches 0.7MPa, behind the heat-insulation pressure keeping 1 hour, connect high-voltage pulse power source 5, applied high-voltage pulse current 10 minutes every half an hour, continuous time 3 times, produce electrohydraulic effect, utilize the shock wave of electrohydraulic effect, the effects such as cavitation impel the corrosion product after the corrosion to flow out core cavity, form fresh corrosion interface, size according to core cavity, complexity, so repeatedly carry out, just can realize removing of core, greatly improve removal efficiency.
The above is illustrated the embodiment of the invention by reference to the accompanying drawings; but the invention is not restricted to above-described embodiment; can also make multiple variation according to the purpose of innovation and creation of the present invention; all according to technical solution of the present invention Spirit Essence and principle under the change made; modify; substitute; combination; simplify; all should be the substitute mode of equivalence; as long as goal of the invention according to the invention; only otherwise deviate from the present invention and utilize electrohydraulic effect to accelerate depoling to remove the technique of speed and know-why and the inventive concept of special-purpose electrohydraulic effect HTHP depoling still thereof, all belong to protection scope of the present invention.
Claims (6)
1. one kind is utilized electrohydraulic effect to accelerate the technique that depoling removes speed, the cleaning process that comprises the inner chamber of the corrosion subtractive process of core of foundry goods and foundry goods, it is characterized in that: the cleaning process of the corrosion subtractive process of the core of foundry goods and the inner chamber of foundry goods is carried out simultaneously, be: under the temperature and pressure environment of setting, constantly the gap applies high-voltage pulse current in the liquid corrosion medium, by electrohydraulic effect the liquid corrosion medium is vaporized rapidly, expand, produce shock wave or cavitation occurs, the core of foundry goods is corroded chemical reaction and physics washes away, product after the corrosion is flowed out from the die cavity of foundry goods, constantly form the core corrosion interface of new foundry goods in the die cavity of foundry goods, the core that accelerates foundry goods removes.
2. the electrohydraulic effect that utilizes according to claim 1 accelerates the technique that depoling removes speed, and it is characterized in that: the current strength of the high-voltage pulse current that applies is 100～5000A, and its voltage is 1～24V.
3. the technique of utilizing electrohydraulic effect to accelerate depoling speed according to claim 1 and 2, it is characterized in that: in the corrosion subtractive process of the core of foundry goods and in the cleaning process of the inner chamber of foundry goods, the foundry goods of core to be removed is under the pressure environment of 100～500 ℃ temperature and 0～10MPa.
4. the electrohydraulic effect that utilizes claimed in claim 1 accelerates the special-purpose electrohydraulic effect HTHP depoling still that depoling removes the technique of speed, in the depoling still, be provided with corrosion liquid pool (4), load the foundry goods (3) of core to be removed in the material frame (2), the described foundry goods (3) that described material frame (2) is loaded immerses in the described corrosion liquid pool (4) fully, it is characterized in that: also arrange electrode (1) in the top of described foundry goods (3), the bottom of described electrode (1) is also immersed in the described corrosion liquid pool (4), described electrode (1) does not contact with the interior described foundry goods (3) that loads of described material frame (2), the top of described electrode (1) connects high-voltage pulse power source (5), described corrosion liquid pool (4) ground connection, control described high-voltage pulse power source (5) and constantly apply high-voltage pulse current in the gap to described corrosion liquid pool (4), under the temperature and pressure environment of setting, by electrohydraulic effect the liquid corrosion medium in the described corrosion liquid pool (4) is vaporized rapidly, expand, produce shock wave or cavitation occurs, the core of described foundry goods (3) is corroded chemical reaction and physics washes away, product after the corrosion is flowed out from the die cavity of described foundry goods (3), constantly form the core corrosion interface of new foundry goods in the die cavity of described foundry goods (3), the core that accelerates described foundry goods (3) removes.
5. electrohydraulic effect HTHP depoling still according to claim 4 is characterized in that: the current strength of the high-voltage pulse current of described high-voltage pulse power source (5) output is 100～5000A, and its voltage is 1～24V.
6. according to claim 4 or 5 described electrohydraulic effect HTHP depoling stills, it is characterized in that: in HTHP depoling still, temperature is 100～500 ℃, and pressure is 0～10MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210390857XA CN102896306A (en) | 2012-10-16 | 2012-10-16 | Process for accelerating core removal speed by utilizing liquid-electric effect and special high-temperature high-pressure core removal kettle |
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| CN201210390857XA CN102896306A (en) | 2012-10-16 | 2012-10-16 | Process for accelerating core removal speed by utilizing liquid-electric effect and special high-temperature high-pressure core removal kettle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107962174A (en) * | 2015-04-27 | 2018-04-27 | 李天亮 | A kind of broken casting bed of ultrasonic wave |
| CN112439875A (en) * | 2020-10-28 | 2021-03-05 | 北京航空材料研究院有限公司 | Depoling equipment and depoling method of water-soluble wax core |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1764809A1 (en) * | 1990-07-09 | 1992-09-30 | Кировский Политехнический Институт | Installation for electrohydraulic dressing of castings |
| WO2002045887A1 (en) * | 2000-12-05 | 2002-06-13 | Serf Societe D'etudes Et De Realisation En Fonderie | Device for cleaning cast parts |
| CN1544816A (en) * | 2003-11-27 | 2004-11-10 | 彩虹彩色显像管总厂 | Use of electric water hammer principle and large current pulse discharge water pump realized thereby |
| CN201314219Y (en) * | 2008-09-02 | 2009-09-23 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Liquid-electric effect flushing contaminant releasing device |
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2012
- 2012-10-16 CN CN201210390857XA patent/CN102896306A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1764809A1 (en) * | 1990-07-09 | 1992-09-30 | Кировский Политехнический Институт | Installation for electrohydraulic dressing of castings |
| WO2002045887A1 (en) * | 2000-12-05 | 2002-06-13 | Serf Societe D'etudes Et De Realisation En Fonderie | Device for cleaning cast parts |
| CN1544816A (en) * | 2003-11-27 | 2004-11-10 | 彩虹彩色显像管总厂 | Use of electric water hammer principle and large current pulse discharge water pump realized thereby |
| CN201314219Y (en) * | 2008-09-02 | 2009-09-23 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Liquid-electric effect flushing contaminant releasing device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107962174A (en) * | 2015-04-27 | 2018-04-27 | 李天亮 | A kind of broken casting bed of ultrasonic wave |
| CN107983939A (en) * | 2015-04-27 | 2018-05-04 | 李天亮 | A kind of broken casting bed of casting |
| CN108097933A (en) * | 2015-04-27 | 2018-06-01 | 李天亮 | A kind of broken casting bed of rectangular configuration filter sand grate |
| CN108145135A (en) * | 2015-04-27 | 2018-06-12 | 李天亮 | A kind of broken casting bed |
| CN108188382A (en) * | 2015-04-27 | 2018-06-22 | 李天亮 | A kind of broken casting bed of ultrasonic wave casting |
| CN112439875A (en) * | 2020-10-28 | 2021-03-05 | 北京航空材料研究院有限公司 | Depoling equipment and depoling method of water-soluble wax core |
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Application publication date: 20130130 |