CN102974760B - Lost foam casting device and casting method - Google Patents
Lost foam casting device and casting method Download PDFInfo
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- CN102974760B CN102974760B CN201210478749.8A CN201210478749A CN102974760B CN 102974760 B CN102974760 B CN 102974760B CN 201210478749 A CN201210478749 A CN 201210478749A CN 102974760 B CN102974760 B CN 102974760B
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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 Technology of EPC field, a kind of method that especially relates to 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 meet the large, medium and small all kinds of foundry goods of different structure.Its cardinal principle is for first making bubble mould, in bubble mould external coating handtailor coating oven dry, then the mould of oven dry is placed in to special sandbox, insert dry sand and shake consolidation, cover the case mouth of sandbox with plastic sheeting, then vacuumize by 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.There is the advantages such as dimensional accuracy is high, with short production cycle, environmental pollution is little compared with traditional forging type.
When molten metal enters after the die cavity of bubble mould, liquid rotating becomes solid when cooling, under the wall chilling action of gravity and bubble mould, foundry goods top defect is more than foundry goods bottom defect, for the significant points of foundry goods, (significant points mainly refers to: dimension precision requirement is high, 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 to the bottom of described sandbox casing down.But follow this principle and there will be the situation that forms dead angle, this be because, because foundry goods shape is different, some foundry goods exist upwards depression, surrounding to stop the problems such as serious, burying in the process of case moulding, the formation dead angle, position that part molding sand cannot arrive, also exist in addition some due to the not enough situation that forms dead angle of negative pressure, due to lower in the sand compaction at dead angle place, 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 flaw such as scab, burning into sand.
In addition, in the prior art, the mode that vacuumizes of lost foam casting sandbox is had to three kinds, bottom pumping type, take out with side and take out combined type at side-extract type and the end, bottom pumping type is in the bottom of sandbox casing, negative tube to be set to vacuumize, 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 is also provided with negative tube in the side of sandbox, improve to a certain extent the vacuum state of casting model powder upper box part, but still difficulty reaches best state, particularly lost foam casting often runs into the casing class foundry goods of large plane foundry goods and multiaspect sealing in producing, mould has hidden most of bottom surface negative tube while placement in sandbox, seriously stop negative pressure extracting, even negative tube is set in side, but distance center is far away, the die cavity top negative pressure of bubble mould is inadequate, under lower vacuum state, easily cause crush.Therefore in 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 place takies larger.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, and provide one can eliminate dead angle, avoid occurring lost foam casting device and the casting method of the problem 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, bubble mould, cast unit and vacuum unit, wherein, described sandbox inner formation spatial accommodation and top have opening, in described spatial accommodation, be filled with molding sand, bubble mould is placed in described molding sand, sealing film seals described opening, vacuum unit is connected with described sandbox is inner, cast unit is connected with described bubble mould, it is characterized in that, the below that described bubble mould is provided with detachable loose piece and described loose piece is the bubble mould of the prediction dead angle that molding sand cannot arrive while burying case.
According to lost foam casting device of the present invention embodiment, 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 is placed in sandbox inside.
According to lost foam casting device of the present invention embodiment, described movable negative-pressure pipe comprises that vertically the negative pressure house steward that arranges and multiple 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 lost foam casting device of the present invention embodiment, described movable negative-pressure pipe is arranged on upper surface 150～200mm place of the described bubble mould of distance.
According to lost foam casting device of the present invention embodiment, 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 is placed in the described bubble mould cavity of sandbox inside.
According to lost foam casting device of the present invention embodiment, described movable negative-pressure pipe is arranged on the mold thickness of the inwall surrounding of described bubble mould and is greater than 80mm place.
Another aspect of the present invention provides a kind of casting method of evaporative pattern, lost foam casting device described in described casting method as described in casting method employing any one as above-mentioned in claim is cast, comprise make bubble mould, bury case moulding, vacuumize with negative pressure under pour into a mould, wherein, in described operation of burying case moulding, comprise the following steps: placement part molding sand, vibration ramming; The bubble mould, the cast unit that comprise loose piece are put into sandbox and be placed on described part molding sand, by the critical surfaces of bubble mould and processing placed face down; Take out described loose piece, continue to add part molding sand, vibration ramming to bury case dead angle to tamp bubble mould, put back to described loose piece; Finally add part molding sand to cover bubble mould, after vibration ramming, place sealing film at the opening part of sandbox casing, vacuumize afterwards with negative pressure under pour into a mould.
According to lost-foam casting method of the present invention embodiment, described casting method is also included in while burying case moulding above described bubble mould or the step of setting up movable negative-pressure pipe in cavity, and described movable negative-pressure pipe is removable after casting completes.
In addition, the present invention also provides a kind of casting device of evaporative pattern, described casting device comprises sandbox, sealing film, bubble mould, cast unit and vacuum unit, wherein, described sandbox inner formation spatial accommodation and top have opening, in described spatial accommodation, be filled with molding sand, bubble mould is placed in described molding sand, sealing film seals described opening, vacuum unit is connected with described sandbox is inner, cast unit is connected with described bubble mould, described vacuum unit comprises the movable negative-pressure pipe being arranged on removedly in described bubble mould top or bubble mould cavity, one end of described movable negative-pressure pipe is connected with the vavuum pump of sandbox outside, the other end of described movable negative-pressure pipe is placed in sandbox inside.
Compared with prior art, beneficial effect of the present invention comprises: what (1) solve foam mold buries case Dead Core Problems, has improved sand compaction, prevents foundry goods scab, burning into sand, improves casting quality; (2) improve the vacuum in the casing class casting sand box of large plane foundry goods and multiaspect sealing, sharply the declining and cause the problem of casting mold crush to product rejection of vacuum in sandbox while solving due to cast; (3) avoid making for different product feature the sandbox of Multiple Type, economize on the use of funds and place.
Brief description of the 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 is provided with the lost foam casting device of movable negative-pressure pipe above bubble mould of Fig. 2 A exemplary embodiment of the present.
The front view that is provided with the lost foam casting device of movable negative-pressure pipe above bubble mould of Fig. 2 B exemplary embodiment of the present.
The front view that is provided with the lost foam casting device of movable negative-pressure pipe in bubble mould cavity 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.
Detailed description of the invention
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, the lost foam casting device of this exemplary embodiment comprises sandbox 1, sealing film 2, bubble mould 3 (after casting complete, this bubble mould is substituted by foundry goods), cast unit 4 and vacuum unit.Wherein, the inner formation spatial accommodation of described sandbox 1 and top have opening, are filled with molding sand in spatial accommodation; Bubble mould 3 is placed in 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 case dead angle place in order to improve bubble mould 3, prevent that dope layer from damaging to avoid foundry goods scab, burning into sand, on bubble mould 3, detachable loose piece 5 is set, and the below of this loose piece 5 be prediction bubble mould 3 bury case time the molding sand dead angle that cannot arrive, in the process that adds molding sand, take out loose piece and can form the passage that adds molding sand, add molding sand and tamp behind dead angle, put back to loose piece 5, for after loose piece is put back to can and bubble coordinating between mould better, can the gap between loose piece and 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 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 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.As shown in Fig. 2 A to Fig. 2 C, in order to solve negative pressure deficiency (vacuum the is inadequate) problem of bubble mould 3 tops and cavity inside, avoid negative pressure deficiency and form dead angle, loose piece 5 as above can be set, in addition for fear of crush, except arranging negative tube 6 as bottom or the side at sandbox 1 in prior art, set up movable negative-pressure pipe 7 in the place that negative tube need to be set, 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, the other end is placed in sandbox inside, and movable negative-pressure pipe 7 can remove.On sealing film 2, be provided with the otch passing for this movable negative-pressure pipe 7.
When producing large plane foundry goods, casing class foundry goods or the foundry goods of multiaspect sealing block bottom negative tube 6 in more situation, in order to prevent occurring the defeated and dispersed crush that causes of molding sand while cast under negative pressure because negative pressure intensity is low, as Fig. 2 A, shown in 2B, movable negative-pressure pipe 7 can be arranged on to bubble mould 3 tops, this movable negative-pressure pipe 7 comprises that vertically the negative pressure house steward 7a that arranges and multiple 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, negative pressure is in charge of the number of 7b and is chosen according to producing 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.
In the time producing tubular foundry goods, as shown in Figure 2 C, movable negative-pressure pipe 7 can be arranged in the cavity of bubble mould, to improve the negative pressure in the cavity that steeps mould 3.Further, movable negative-pressure pipe is arranged on cavity middle part, is greater than 80mm place with the mold thickness of the inwall surrounding of described bubble mould, if mold thickness is less than or equal to 80mm, in casting process, movable negative-pressure pipe is easy to be subject to 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 the lost foam casting device as described in above-mentioned any one to cast, comprise make bubble mould, bury case moulding, vacuumize with negative pressure under pour into a mould operation.Wherein, in described operation of burying case moulding, comprise the following steps: placement part molding sand, vibration ramming; The bubble mould, the cast unit that comprise loose piece are put into sandbox and be placed on described part molding sand, by the critical surfaces of bubble mould and processing placed face down; Take out described loose piece, continue to add part molding sand, vibration ramming to bury case dead angle to tamp bubble mould, put back to described loose piece; Finally add part molding sand to cover bubble mould, after vibration ramming, place sealing film at the opening part of sandbox casing, vacuumize afterwards with negative pressure under pour into a mould.
Further, described casting method can also comprise, in the time burying case moulding, the step of setting up movable negative-pressure pipe at the not enough place of negative pressure, usually, 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 completes.After setting up movable negative-pressure pipe step, can process to form the otch that can make movable negative-pressure pipe pass to sealing film, one end of movable negative-pressure pipe is connected with the negative pressure flexible pipe being connected on vavuum pump by this otch, wherein, the junction of movable negative-pressure pipe and this negative pressure flexible pipe is greater than 100mm apart from sandbox top; Placing in the step of sealing film, the otch of sealing film can be improved to be affixed on the outer wall of movable negative-pressure pipe, then vacuumize and form 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.As shown in Fig. 3 A, 3B, in order to make sealing effectiveness better, wet sand or wet mud 8 can also be set at the outer wall of sealing film and movable negative-pressure pipe, the molding sand place of fitting tightly.In addition, in order to protect sealing film not damaged, maintain negative regulation, can on sealing film, place again molding sand after one deck 40～50mm as facing sand.
According to lost-foam casting method of the present invention exemplary embodiment, described casting method adopts casts 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 9.15m semi-autogenous mill, size (length × wide × height) is: 1740mm × 1070mm × 416mm, the size (long × wide × dark) of sandbox is: 1850mm × 1450mm × 1600mm, is provided with negative tube in the bottom of sandbox.
First make foam mold according to above-mentioned size, because this aside-liner need to be obliquely installed, so can form and bury case dead angle at the gusset place of foam mold bottom, therefore the bubble mould of prediction is buried to 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, in the time that molding sand reach a certain height, owing to burying the existence at case dead angle, the loose piece cutting in advance need to be taken out to form the passage that adds molding sand, add molding sand and carry out microseism and artificial consolidation from this passage, after tamping dead angle, put back to loose piece, and the gap between loose piece and foam mold is sealed with coating plaster; Finally add again part molding sand to cover foam mold, after vibration ramming, place sealing film at the opening part of sandbox casing, 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 9.15m semi-autogenous mill, size (length × wide × height) is: 1994mm × 686mm × 270mm, the size (length × wide × height) of sandbox is: 2300mm × 1100mm × 1300mm, is provided with negative tube in the bottom of sandbox.
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, in the time that molding sand reach a certain height, take out loose piece 5, continue to add part molding sand, vibration ramming buries case dead angle to tamp bubble mould, put back to described loose piece 5, while continuing to add molding sand to needs holding movable negative tube, stop adding molding sand, shake make molding sand consolidation and smooth after put into as Fig. 2 A and Fig. 2 B movable negative-pressure pipe, one end of this movable negative-pressure pipe is connected with the negative pressure flexible pipe being connected on vavuum pump by the otch on 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 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, after casting complete, keep certain hour to negative pressure to fail, movable negative-pressure pipe is taken out and buries case modeling process for other.
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 sandbox configurations can meet the production of the shell liner of semi-autogenous mill.
Example 3
Production one is held together ore deposit circle, size (overall diameter × interior diameter × height) is: 650mm × 500mm × 1050mm, belong to the dark barrel structure castings of annular, the size (long × wide × dark) of sandbox is: 1100mm × 1450mm × 1600mm, is provided with negative tube in the bottom of sandbox.
First make foam mold according to above-mentioned size, the mould of plastics of making is put into sandbox, and leave mold thickness around foam mold, because the cross section of this foam mold is annular, and highly higher, therefore 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 to stop adding molding sand, shake make molding sand consolidation and smooth after put into inverted L shape movable negative-pressure pipe as shown in Figure 2 C, one end of this movable negative-pressure pipe is connected with the negative pressure flexible pipe being connected on vavuum pump by the otch on 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 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, after casting complete, keep certain hour to negative pressure to fail, movable negative-pressure pipe is taken out and buries case modeling process for other.
Adopt the method to produce 20 and hold together ore deposit circle, product quality is good, reaches requirement.
The casting method of evaporative pattern of the present invention, by detachable loose piece is set, is conducive to improve the vacuum at dead angle place, strengthens the sand compaction at dead angle place, prevents foundry goods scab, has improved casting quality; On the other hand, burying in the process of case moulding, movable negative-pressure pipe is set up in the place of negative pressure deficiency above mould of plastics or in cavity etc., in the time of cast, movable negative-pressure pipe is connected with vavuum pump, solve the problem of bubble mould die cavity top or cavity inside negative pressure deficiency, and after having cast, this movable negative-pressure pipe can remove, and produces for other sandbox, and general 2～3 movable negative-pressure pipes just can complete with multiple 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 loose piece and movable negative-pressure pipe simultaneously, particularly, can select according to producing actual needs.
In sum, lost foam casting device of the present invention and casting method tool have the following advantages: what (1) solve bubble mould buries case dead angle, improves the vacuum at dead angle place, strengthens sand compaction, prevents foundry goods scab, burning into sand, improves casting quality; (2) improve the vacuum in the casing class casting sand box of large plane foundry goods and multiaspect sealing, sharply the declining and cause casting mold crush to make the problem of product rejection of vacuum in sandbox while solving due to cast; (3) avoid making for different product feature the 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 illustrate and described casting device and the method for evaporative pattern of the present invention above in conjunction with the embodiments, but what those skilled in the art will appreciate that is, in the case of not departing from the spirit and scope of the present invention that limit as claims, can make the various changes in form and details here.
Claims (9)
1. the casting device of an evaporative pattern, comprise sandbox, sealing film, bubble mould, cast unit and vacuum unit, wherein, described sandbox inner formation spatial accommodation and top have opening, in described spatial accommodation, be filled with molding sand, bubble mould is placed in described molding sand, sealing film seals described opening, vacuum unit is connected with described sandbox is inner, cast unit is connected with described bubble mould, it is characterized in that, the below that described bubble mould is provided with detachable loose piece and described loose piece is the bubble mould of the prediction dead angle that molding sand cannot arrive while burying case.
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 is placed in sandbox inside.
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 multiple 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. the casting device of evaporative pattern 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 is placed 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 the mold thickness of the inwall surrounding of described bubble mould and is greater than 80mm place.
7. a casting method for evaporative pattern, is characterized in that, described casting method adopts the lost foam casting device as described in any one in claim 1 to 6 to cast.
8. the casting method of evaporative pattern according to claim 7, is characterized in that, described casting method comprise make bubble mould, bury case moulding, vacuumize with negative pressure under pour into a mould, wherein,
In described operation of burying case moulding, comprise the following steps:
Placement part molding sand, vibration ramming;
The bubble mould, the cast unit that comprise loose piece are put into sandbox and be placed on described part molding sand, by the critical surfaces of bubble mould and processing placed face down;
Take out described loose piece, continue to add part molding sand, vibration ramming to bury case dead angle to tamp bubble mould, put back to described loose piece;
Finally add part molding sand to cover bubble mould, after vibration ramming, place sealing film at the opening part of sandbox casing, 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 is also included in while burying case moulding above described bubble mould or the step of setting up movable negative-pressure pipe in cavity, and described movable negative-pressure pipe is removable after casting completes.
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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 |
| 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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| CN102380578A (en) * | 2011-11-10 | 2012-03-21 | 华中科技大学 | Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy |
| CN202283589U (en) * | 2011-11-14 | 2012-06-27 | 李复旺 | Anti-sand-crushing device for foam model of lathe body |
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| CN102974760A (en) | 2013-03-20 |
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