CN102974760A - Lost foam casting device and casting method - Google Patents
Lost foam casting device and casting method Download PDFInfo
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- CN102974760A CN102974760A CN2012104787498A CN201210478749A CN102974760A CN 102974760 A CN102974760 A CN 102974760A CN 2012104787498 A CN2012104787498 A CN 2012104787498A CN 201210478749 A CN201210478749 A CN 201210478749A CN 102974760 A CN102974760 A CN 102974760A
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Abstract
The invention discloses a lost foam casting device and a casting method. The lost foam casting device comprises a moulding flask, a sealing film, a plastic mould, a casting unit and a vacuumizing unit, wherein the plastic mould is provided with a detachable movable block, a dead angle, which can not be reached by the plastic mould when the moulding flask is buried, is positioned below the movable block. In addition, the lost foam casting device further comprises a movable negative pressure pipe which is independently arranged. The casting method comprises the following steps of: manufacturing the plastic mould, burying the moulding flask to be moulded, and carrying out vacuumizing operation and the negative pressure casting process. In the moulding flask burying and moulding process, the movable block above the dead angle of the plastic mould is taken off to fill the dead angle of the buried moulding flask of the plastic mould. The casting method further comprises a step of additionally arranging the movable negative pressure pipe. The lost foam casting device and the casting method, which are disclosed by the invention, can be used for eliminating the dead angle, solving the collapse problem caused by the insufficient vacuum degree above the plastic mould or in a cavity, and enhancing the quality of castings.
Description
Technical field
The present invention relates to the Technology of EPC field, the method that especially relates to a kind of lost foam casting device and adopt this lost foam casting device to cast.
Background technology
Lost foam casting process is applicable to the various materials such as cast steel, cast iron, cast copper, cast aluminium, and can satisfy the large, medium and small all kinds of foundry goods of different structure.Its cardinal principle is for making first the bubble mould, in bubble mould external coating handtailor coating and oven dry, then the mould with oven dry places special sandbox, insert dry sand and shake consolidation, the case mouth with plastic sheeting covering sandbox then vacuumizes with vacuum system, under negative pressure state, pour into a mould, the gasification of bubble mould disappears, and molten metal displacement bubble mould copies the foundry goods the same with steeping mould.Compare with traditional forging type have the dimensional accuracy height, with short production cycle, the advantage such as environmental pollution is little.
Enter the die cavity of bubble mould when molten metal after, because liquid rotating becomes solid during cooling, under the wall chilling action of gravity and bubble mould, foundry goods top defective is more than foundry goods bottom defective, (significant points mainly refers to: dimension precision requirement is high for the significant points of foundry goods, the face or certain position that need fine finishining to obtain, and withstand shocks and working strength is large and the position of frequent wear) can obtain high-quality, generally follow the principle that critical surfaces and machined surface is placed on the bottom of described sandbox casing down.But follow the situation that the dead angle can appear forming in this principle, this be because, because the foundry goods shape is different, the problems such as serious are upwards caved in, stop in the foundry goods existence that has all around, in the process of burying the case moulding, the position that the part molding sand can't arrive forms the dead angle, also there are in addition some because the not enough situation that forms the dead angle of negative pressure, because the sand compaction at the place, dead angle is lower, molten metal can destroy the dope layer at this place under certain gravity and negative pressure of vacuum, bring molding sand into, molding sand movement in molten metal can cause the casting flaws such as scab, burning into sand.
In addition, in the prior art, the mode that vacuumizes to lost foam casting sandbox has three kinds, bottom pumping type, take out with side and take out combined type at side-extract type and the end, bottom pumping type vacuumizes in the bottom of sandbox casing negative tube being set, because bottom pumping type casting sandbox exists vacuum gradient in the vertical direction, and apart from sandbox bottom gas far away more hard-pumped remove, side-extract type casting sandbox also is provided with negative tube in the side of sandbox, improved to a certain extent the vacuum state of casting model powder upper box part, but still the difficult state that reaches the best, particularly often run into the casing class foundry goods of large plane foundry goods and multiaspect sealing in the lost foam casting production, mould has hidden most of bottom surface negative tube when placing in sandbox, seriously stop negative pressure extracting, even in the side negative tube is set, but distance center is far away, the die cavity top negative pressure of bubble mould is inadequate, causes easily crush under lower vacuum state.Therefore in the prior art, need to use special shape mo(u)lding box for the casing class foundry goods of large plane foundry goods and multiaspect sealing, cost of manufacture is high, and the place takies larger.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, and a kind of dead angle of can eliminating is provided, avoid occurring lost foam casting device and the casting method of the problems such as scab, burning into sand.
To achieve these goals, one aspect of the present invention provides a kind of lost foam casting device, described casting device, comprise sandbox, sealing film, the bubble mould, cast unit and vacuum unit, wherein, described sandbox inner formation spatial accommodation and top have opening, be filled with molding sand in the described spatial accommodation, the bubble mould is placed in the described molding sand, sealing film seals described opening, and vacuum unit is connected with described sandbox is inner, and the cast unit is connected with described bubble mould, it is characterized in that the dead angle that molding sand can't arrive when case was buried for the bubble mould of prediction in the below that described bubble mould is provided with detachable loose piece and described loose piece.
An embodiment according to lost foam casting device of the present invention, described vacuum unit can comprise the movable negative-pressure pipe of the top that is arranged on removedly described bubble mould, one end of described movable negative-pressure pipe is connected with the vavuum pump of sandbox outside, and the other end of described movable negative-pressure pipe places sandbox inner.
According to an embodiment of lost foam casting device of the present invention, described movable negative-pressure pipe comprises that vertically the negative pressure house steward that arranges and a plurality of negative pressure of along continuous straight runs setting are in charge of, and wherein, described negative pressure is in charge of and is be arranged in parallel and be communicated with described negative pressure house steward.
According to an embodiment of lost foam casting device of the present invention, described movable negative-pressure pipe is arranged on upper surface 150～200mm place of the described bubble mould of distance.
An embodiment according to lost foam casting device of the present invention, described vacuum unit can comprise the movable negative-pressure pipe in the cavity that is arranged on described bubble mould, one end of described movable negative-pressure pipe is connected with the vavuum pump of sandbox outside, and the other end of described movable negative-pressure pipe places in the described bubble mould cavity of sandbox inside.
According to an embodiment of lost foam casting device of the present invention, described movable negative-pressure pipe is arranged on mold thickness around the inwall with described bubble mould greater than the 80mm place.
Another aspect of the present invention provides a kind of casting method of evaporative pattern, the described casting method of described casting method adopts casts such as above-mentioned each the described lost foam casting device of claim, comprise make the bubble mould, bury the case moulding, vacuumize with negative pressure under pour into a mould, wherein, in described operation of burying the case moulding, may further comprise the steps: placement part molding sand, vibration ramming; Bubble mould, the cast unit that will comprise loose piece are put into sandbox and are placed on the described part molding sand, critical surfaces that will the bubble mould and process placed face down; Take out described loose piece, continuation adds the part molding sand, vibration ramming buries the case dead angle to tamp the bubble mould, puts back to described loose piece; Add at last the part molding sand to cover the bubble mould, the opening part at the sandbox casing behind the vibration ramming is placed sealing film, vacuumize afterwards with negative pressure under pour into a mould.
According to an embodiment of lost-foam casting method of the present invention, described casting method also is included in when burying the case moulding above described bubble mould or the step of setting up the movable negative-pressure pipe in the cavity, and described movable negative-pressure pipe is removable after casting is finished.
In addition, the present invention also provides a kind of casting device of evaporative pattern, described casting device comprises sandbox, sealing film, the bubble mould, cast unit and vacuum unit, wherein, described sandbox inner formation spatial accommodation and top have opening, be filled with molding sand in the described spatial accommodation, the bubble mould is placed in the described molding sand, sealing film seals described opening, vacuum unit is connected with described sandbox is inner, the cast unit is connected with described bubble mould, it is characterized in that, described vacuum unit comprises the movable negative-pressure pipe that is arranged on removedly in described bubble mould top or the bubble mould cavity, and an end of described movable negative-pressure pipe is connected with the vavuum pump of sandbox outside, and the other end of described movable negative-pressure pipe places sandbox inner.
Compared with prior art, beneficial effect of the present invention comprises: what (1) solved foam mold buries the case Dead Core Problems, has improved sand compaction, prevents foundry goods scab, burning into sand, improves casting quality; (2) improve the interior vacuum of casing class casting sand box that large plane foundry goods and multiaspect are sealed, the rapid decline of the interior vacuum of sandbox causes the casting mold crush to the problem of product rejection when solving owing to cast; (3) avoid making for the different product characteristics sandbox of Multiple Type, economize on the use of funds and the place.
Description of drawings
Figure 1A is the side view of the lost foam casting device of exemplary embodiment of the present.
Figure 1B is the front view of the lost foam casting device of exemplary embodiment of the present.
The side view that above the bubble mould, is provided with the lost foam casting device of movable negative-pressure pipe of Fig. 2 A exemplary embodiment of the present.
The front view that above the bubble mould, is provided with the lost foam casting device of movable negative-pressure pipe of Fig. 2 B exemplary embodiment of the present.
The front view that in bubble mould cavity, is provided with the lost foam casting device of movable negative-pressure pipe of Fig. 2 C exemplary embodiment of the present.
Fig. 3 A is the movable negative-pressure pipe of exemplary embodiment of the present and the connection diagram of sealing film.
Fig. 3 B is the schematic diagram that is provided with wet sand or wet mud on the sealing film of exemplary embodiment of the present.
Description of reference numerals:
1-sandbox, 2-sealing film, 3-bubble mould, 4-running gate system, 4a-cup, 4b-running channel, 5-loose piece, 6-negative tube, 7-movable negative-pressure pipe, 7a-negative pressure house steward, 7b-negative pressure are in charge of, the wet mud of 8-or wet husky.
The specific embodiment
Describe in detail according to lost foam casting device of the present invention with exemplary embodiment below with reference to accompanying drawings.
Figure 1A is the side view of the lost foam casting device of exemplary embodiment of the present, and Figure 1B is the front view of the lost foam casting device of exemplary embodiment of the present.As shown in Figure 1A and 1B, after the lost foam casting device of this exemplary embodiment comprised sandbox 1, sealing film 2, bubble mould 3(casting complete, this bubble mould was substituted by foundry goods), pour into a mould unit 4 and vacuum unit.Wherein, described sandbox 1 inner formation spatial accommodation and top have opening, are filled with molding sand in spatial accommodation; Bubble mould 3 is placed in the described molding sand, usually steeps mould 3 and makes for foam or plastics; Sealing film 2 fits tightly with the opening of described sandbox 1, and to seal described opening, described vacuum unit is connected with the inside of described sandbox 1, and described cast unit 4 is connected with described bubble mould 3, comprises cup 4a and running channel 4b.When casting technique is determined, bubble mould 3 placement locations have just been determined, have or not dead angle and position, dead angle just can to predict or judge, bury the sand compaction at place, case dead angle in order to improve bubble mould 3, prevent that dope layer from damaging to avoid foundry goods scab, burning into sand, at bubble mould 3 detachable loose piece 5 is set, and the below of this loose piece 5 for the bubble mould 3 of prediction bury case the time molding sand dead angle that can't arrive, in the process that adds molding sand, take out loose piece and can form the passage that adds molding sand, after adding molding sand and tamping the dead angle, put back to loose piece 5, for can be better with bubble cooperating between the mould after loose piece is put back to, can the slit between loose piece and the foam mold be sealed with coating plaster.
Fig. 2 A is the side view that is provided with the lost foam casting device of movable negative-pressure pipe above the bubble mould of exemplary embodiment of the present, Fig. 2 B is the front view that is provided with the lost foam casting device of movable negative-pressure pipe above the bubble mould of exemplary embodiment of the present, and figure is the front view that is provided with the lost foam casting device of movable negative-pressure pipe in bubble mould cavity of 2C exemplary embodiment of the present.Shown in Fig. 2 A to Fig. 2 C, for not enough (vacuum the is inadequate) problem of negative pressure that solves bubble mould 3 tops and cavity inside, avoid the negative pressure deficiency and form the dead angle, aforesaid loose piece 5 can be set, in addition for fear of crush, except arranging the negative tube 6 such as bottom or the side at sandbox 1 in the prior art, movable negative-pressure pipe 7 is set up in the place that negative tube is set at needs, usually, movable negative-pressure pipe 7 is arranged in the top or cavity of bubble mould 3, one end of this movable negative-pressure pipe 7 is connected with the vavuum pump of sandbox outside, and the other end places sandbox inner, and movable negative-pressure pipe 7 can remove.Be provided with the otch that passes for this movable negative-pressure pipe 7 at sealing film 2.
When producing large plane foundry goods, casing class foundry goods or the foundry goods of multiaspect sealing block bottom negative tube 6 in the more situation, the defeated and dispersed crush that causes of molding sand appears because negative pressure intensity is low when preventing under the negative pressure cast, such as Fig. 2 A, shown in the 2B, movable negative-pressure pipe 7 can be arranged on bubble mould 3 tops, this movable negative-pressure pipe 7 comprises that vertically the negative pressure house steward 7a that arranges and a plurality of negative pressure of along continuous straight runs setting are in charge of 7b, wherein, negative pressure is in charge of that 7b is horizontally disposed with and is communicated with negative pressure house steward 7a simultaneously, and negative pressure is in charge of the number of 7b and is chosen according to the production actual needs.According to the experience of production scene, for the ease of bubble mould 3 tops are vacuumized thoroughly, movable negative-pressure pipe 7 is arranged on upper surface 150～200mm place of distance bubble mould 3.
When producing tubular foundry goods, shown in Fig. 2 C, movable negative-pressure pipe 7 can be arranged in the cavity of bubble mould, with the negative pressure in the cavity that improves bubble mould 3.Further, the movable negative-pressure pipe is arranged on cavity middle part, with mold thickness around the inwall of described bubble mould greater than the 80mm place, if mold thickness is less than or equal to 80mm, in casting process, the movable negative-pressure pipe is easy to be subject to the high-temperature molten steel damage, has shortened the life-span of movable negative-pressure pipe.
Another aspect of the present invention provides a kind of casting method of evaporative pattern, and described casting method adopts as above-mentioned each described lost foam casting device is cast, comprise make the bubble mould, bury the case moulding, vacuumize with negative pressure under pour into a mould operation.Wherein, in described operation of burying the case moulding, may further comprise the steps: placement part molding sand, vibration ramming; Bubble mould, the cast unit that will comprise loose piece are put into sandbox and are placed on the described part molding sand, critical surfaces that will the bubble mould and process placed face down; Take out described loose piece, continuation adds the part molding sand, vibration ramming buries the case dead angle to tamp the bubble mould, puts back to described loose piece; Add at last the part molding sand to cover the bubble mould, the opening part at the sandbox casing behind the vibration ramming is placed sealing film, vacuumize afterwards with negative pressure under pour into a mould.
Further, described casting method can also comprise, when burying the case moulding, the step of setting up the movable negative-pressure pipe at the not enough place of negative pressure, usually, the movable negative-pressure pipe is arranged in the cavity of bubble mould top or bubble mould, this movable negative-pressure pipe is removable after casting is finished.Set up after the movable negative-pressure pipe step, can process to form the otch that the movable negative-pressure pipe is passed to sealing film, one end of movable negative-pressure pipe is connected with negative pressure flexible pipe on being connected to vavuum pump by this otch, wherein, the junction of movable negative-pressure pipe and this negative pressure flexible pipe apart from the sandbox top greater than 100mm; In the step of placing sealing film, the otch of sealing film can be improved to be affixed on the outer wall of movable negative-pressure pipe, vacuumize again the formation negative pressure sealing film and sandbox casing, the outer wall of movable negative-pressure pipe, molding sand are fitted tightly.Fig. 3 A is the movable negative-pressure pipe of exemplary embodiment of the present and the connection diagram of sealing film.Fig. 3 B is the schematic diagram that is provided with wet sand or wet mud on the sealing film of exemplary embodiment of the present.Shown in Fig. 3 A, 3B, better in order to make sealing effectiveness, wet sand or wet mud 8 can also be set at outer wall, the molding sand place of fitting tightly of sealing film and movable negative-pressure pipe.In addition, not damaged in order to protect sealing film, keep negative regulation, can on sealing film, place again molding sand behind one deck 40～50mm as facing sand.
According to an exemplary embodiment of lost-foam casting method of the present invention, described casting method adopts and casts such as 1A to 1B, the shown lost foam casting device of Fig. 2 A to Fig. 2 C.
Below in conjunction with example lost-foam casting method of the present invention is described in detail.
Example 1
Produce the aside-liner that a kind of diameter is the 9.15m semi-autogenous mill, size (length * wide * height) is: 1740mm * 1070mm * 416mm, the size of sandbox (long * wide * dark) is: 1850mm * 1450mm * 1600mm is provided with negative tube in the bottom of sandbox.
At first make foam mold according to above-mentioned size, because this aside-liner need to be obliquely installed, bury the case dead angle so can form at the gusset place of foam mold bottom, so the bubble mould that will predict buries the top incision at case dead angle, form detachable loose piece; The foam mold of making is put into sandbox obliquely, and around foam mold, leave mold thickness; Add molding sand, when molding sand reach a certain height, owing to bury the existence at case dead angle, the loose piece that needs to cut in advance takes out to form the passage that adds molding sand, add molding sand and carry out microseism and artificial consolidation from this passage, put back to loose piece after tamping the dead angle, and with coating plaster the slit between loose piece and the foam mold is sealed; Add at last the part molding sand to cover foam mold, the opening part at the sandbox casing behind the vibration ramming is placed sealing film again, vacuumize afterwards with negative pressure under pour into a mould.
The aside-liner product quality of the semi-autogenous mill that employing the method is produced is good, reaches requirement.
Example 2
Produce the shell liner that a kind of diameter is the 9.15m semi-autogenous mill, size (length * wide * height) is: 1994mm * 686mm * 270mm, the size of sandbox (length * wide * height) is: 2300mm * 1100mm * 1300mm is provided with negative tube in the bottom of sandbox.
At first make foam mold according to above-mentioned size; The foam mold of making is flatly put into sandbox, and around foam mold, leave mold thickness; Add molding sand, when molding sand reach a certain height, take out loose piece 5, continue to add the part molding sand, vibration ramming buries the case dead angle to tamp the bubble mould, put back to described loose piece 5, stop to add molding sand when continuing to add molding sand to needs holding movable negative tube, shake make the molding sand consolidation and smooth after put into such as Fig. 2 A and Fig. 2 B movable negative-pressure pipe, one end of this movable negative-pressure pipe is connected with negative pressure flexible pipe on being connected to vavuum pump by the otch on the sealing film, wherein, the junction of movable negative-pressure pipe and this negative pressure flexible pipe is apart from sandbox top 110mm, then the otch of sealing film is improved to be affixed on the outer wall of movable negative-pressure pipe, vacuumize again the formation negative pressure and make sealing film and sandbox casing, the outer wall of movable negative-pressure pipe, molding sand fits tightly; Then apply the wet mud of a circle at outer wall, the molding sand place of fitting tightly of sealing film and movable negative-pressure pipe; Put cup, and place facing sand; Vacuumize afterwards with negative pressure under pour into a mould; Keep certain hour to negative pressure to fail behind the casting complete, with the movable negative-pressure pipe take out be used for other bury the case modeling process.
The shell liner product quality of the semi-autogenous mill that employing the method is produced is good, reaches requirement, and 2 movable negative-pressure pipes of 7 sandboxes configurations namely can satisfy the production of the shell liner of semi-autogenous mill.
Example 3
Produce a kind of ore deposit circle that holds together, size (overall diameter * interior diameter * height) is: 650mm * 500mm * 1050mm, belong to the dark barrel structure castings of annular, the size of sandbox (long * wide * dark) is: 1100mm * 1450mm * 1600mm is provided with negative tube in the bottom of sandbox.
At first make foam mold according to above-mentioned size; The mould of plastics of making is put into sandbox, and around foam mold, leave mold thickness; Because the cross section of this foam mold is annular, and highly higher, so the vacuum in the inside of foam mold is lower, particularly little in internal upper part position negative pressure, therefore, add molding sand to the foam mold first half and stop to add molding sand, shake make the molding sand consolidation and smooth after put into inverted L shape movable negative-pressure pipe shown in Fig. 2 C, one end of this movable negative-pressure pipe is connected with negative pressure flexible pipe on being connected to vavuum pump by the otch on the sealing film, wherein, the junction of movable negative-pressure pipe and this negative pressure flexible pipe is apart from sandbox top 110mm, then the otch of sealing film is improved to be affixed on the outer wall of movable negative-pressure pipe, vacuumize again the formation negative pressure and make sealing film and sandbox casing, the outer wall of movable negative-pressure pipe, molding sand fits tightly; Then apply the wet mud of a circle at outer wall, the molding sand place of fitting tightly of sealing film and movable negative-pressure pipe; Put cup, and place facing sand; Vacuumize afterwards with negative pressure under pour into a mould; Keep certain hour to negative pressure to fail behind the casting complete, with the movable negative-pressure pipe take out be used for other bury the case modeling process.
Adopt the method to produce 20 and hold together the ore deposit circle, product quality is good, reaches requirement.
The casting method of evaporative pattern of the present invention is conducive to improve the vacuum at place, dead angle by detachable loose piece is set, and strengthens the sand compaction at place, dead angle, prevents foundry goods scab, has improved casting quality; On the other hand, in the process of burying the case moulding, the movable negative-pressure pipe is set up in the place of negative pressure deficiency above mould of plastics or in the cavity etc., when cast, the movable negative-pressure pipe is linked to each other with vavuum pump, solved the problem of bubble mould die cavity top or cavity inside negative pressure deficiency, and after casting is finished, this movable negative-pressure pipe can remove, and is used for the production of other sandbox, and general 2～3 movable negative-pressure pipes just can be finished with a plurality of sandboxes and come into operation in turn.Lost foam casting device of the present invention can be set up loose piece or movable negative-pressure pipe, also can set up simultaneously loose piece and movable negative-pressure pipe, particularly, can select according to producing actual needs.
In sum, lost foam casting device of the present invention and casting method have following advantage: what (1) solved the bubble mould buries the case dead angle, improves the vacuum at place, dead angle, strengthens sand compaction, prevents foundry goods scab, burning into sand, improves casting quality; (2) improve the interior vacuum of casing class casting sand box that large plane foundry goods and multiaspect are sealed, the rapid decline of the interior vacuum of sandbox causes the casting mold crush to make the problem of product rejection when solving owing to cast; (3) avoid making for the different product characteristics sandbox of Multiple Type, reduced high cost of manufacture and the place area occupied of special shape mo(u)lding box; (4) simple to operate, easily control.
Although the above illustrates and has described casting device and the method for evaporative pattern of the present invention in conjunction with the embodiments, but what those skilled in the art will appreciate that is, in the situation that does not break away from the spirit and scope of the present invention that limit such as claims, can make the various changes on form and the details here.
Claims (10)
1. the casting device of an evaporative pattern, comprise sandbox, sealing film, the bubble mould, cast unit and vacuum unit, wherein, described sandbox inner formation spatial accommodation and top have opening, be filled with molding sand in the described spatial accommodation, the bubble mould is placed in the described molding sand, sealing film seals described opening, vacuum unit is connected with described sandbox is inner, the cast unit is connected with described bubble mould, it is characterized in that the dead angle that molding sand can't arrive when case was buried for the bubble mould of prediction in the below that described bubble mould is provided with detachable loose piece and described loose piece.
2. the casting device of evaporative pattern according to claim 1, it is characterized in that, described vacuum unit comprises the movable negative-pressure pipe of the top that is arranged on removedly described bubble mould, one end of described movable negative-pressure pipe is connected with the vavuum pump of sandbox outside, and the other end of described movable negative-pressure pipe places sandbox inner.
3. the casting device of evaporative pattern according to claim 2, it is characterized in that, described movable negative-pressure pipe comprises that vertically the negative pressure house steward that arranges and a plurality of negative pressure of along continuous straight runs setting are in charge of, and wherein, described negative pressure is in charge of and is be arranged in parallel and be communicated with described negative pressure house steward.
4. lost foam casting device according to claim 3 is characterized in that, described movable negative-pressure pipe is arranged on upper surface 150～200mm place of the described bubble mould of distance.
5. the casting device of evaporative pattern according to claim 1, it is characterized in that, described vacuum unit comprises the movable negative-pressure pipe in the cavity that is arranged on described bubble mould, one end of described movable negative-pressure pipe is connected with the vavuum pump of sandbox outside, and the other end of described movable negative-pressure pipe places in the described bubble mould cavity of sandbox inside.
6. the casting device of evaporative pattern according to claim 5 is characterized in that, described movable negative-pressure pipe is arranged on mold thickness around the inwall with described bubble mould greater than the 80mm place.
7. the casting method of an evaporative pattern is characterized in that, described casting method adopts and casts such as each described lost foam casting device in the claim 1 to 6.
8. the casting method of evaporative pattern according to claim 7 is characterized in that, described casting method comprise make the bubble mould, bury the case moulding, vacuumize with negative pressure under pour into a mould, wherein,
In described operation of burying the case moulding, may further comprise the steps:
The placement part molding sand, vibration ramming;
Bubble mould, the cast unit that will comprise loose piece are put into sandbox and are placed on the described part molding sand, critical surfaces that will the bubble mould and process placed face down;
Take out described loose piece, continuation adds the part molding sand, vibration ramming buries the case dead angle to tamp the bubble mould, puts back to described loose piece;
Add at last the part molding sand to cover the bubble mould, the opening part at the sandbox casing behind the vibration ramming is placed sealing film, vacuumize afterwards with negative pressure under pour into a mould.
9. the casting method of evaporative pattern according to claim 8, it is characterized in that, described casting method also is included in when burying the case moulding above described bubble mould or the step of setting up the movable negative-pressure pipe in the cavity, and described movable negative-pressure pipe is removable after casting is finished.
10. the casting device of an evaporative pattern, comprise sandbox, sealing film, the bubble mould, cast unit and vacuum unit, wherein, described sandbox inner formation spatial accommodation and top have opening, be filled with molding sand in the described spatial accommodation, the bubble mould is placed in the described molding sand, sealing film seals described opening, vacuum unit is connected with described sandbox is inner, the cast unit is connected with described bubble mould, it is characterized in that, described vacuum unit comprises the movable negative-pressure pipe that is arranged on removedly in described bubble mould top or the bubble mould cavity, one end of described movable negative-pressure pipe is connected with the vavuum pump of sandbox outside, and the other end of described movable negative-pressure pipe places sandbox inner.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105855481A (en) * | 2016-06-13 | 2016-08-17 | 吴江市液铸液压件铸造有限公司 | Casting sand box |
| CN106513580A (en) * | 2017-01-04 | 2017-03-22 | 烟台众达模具铸造有限责任公司 | Lost foam resin sand negative-pressure casting process and special device thereof |
| CN110125332A (en) * | 2019-05-23 | 2019-08-16 | 扬州双集机械有限公司 | Automobile die material smelting technology |
| CN112024825A (en) * | 2020-07-14 | 2020-12-04 | 安徽大卫模具有限公司 | Pouring cup for lost foam casting |
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| CN106513580A (en) * | 2017-01-04 | 2017-03-22 | 烟台众达模具铸造有限责任公司 | Lost foam resin sand negative-pressure casting process and special device thereof |
| CN110125332A (en) * | 2019-05-23 | 2019-08-16 | 扬州双集机械有限公司 | Automobile die material smelting technology |
| CN112024825A (en) * | 2020-07-14 | 2020-12-04 | 安徽大卫模具有限公司 | Pouring cup for lost foam casting |
| CN112024825B (en) * | 2020-07-14 | 2021-12-24 | 安徽大卫模具有限公司 | Pouring cup for lost foam casting |
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| CN102974760B (en) | 2014-10-29 |
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