CN110039006B - Lost foam casting equipment - Google Patents
Lost foam casting equipment Download PDFInfo
- Publication number
- CN110039006B CN110039006B CN201910467879.3A CN201910467879A CN110039006B CN 110039006 B CN110039006 B CN 110039006B CN 201910467879 A CN201910467879 A CN 201910467879A CN 110039006 B CN110039006 B CN 110039006B
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- Prior art keywords
- air
- sand
- sand box
- lost foam
- foam casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
The invention discloses equipment for lost foam casting, which relates to the technical field of precision casting, and adopts the technical scheme that: the device comprises a jolt ramming table, a sand box and a vacuum pump, wherein an air pumping rod is arranged in the sand box and is connected with an air pipe, the air pipe is communicated with an air pumping end of the vacuum pump, and a filter and a vacuum meter are arranged between the air pipe and the vacuum pump; the lower end of the air suction rod is fixed on the inner bottom wall of the sand box, the upper end of the air suction rod faces upwards and is provided with an air inlet, the upper end of the air suction rod is used for being inserted into the groove of the bottom wall of the workpiece, and an air passage for communicating the air inlet with the air pipe is arranged in the air suction rod. The equipment for lost foam casting can ensure that the grooves on the bottom wall of the workpiece are filled with the molding sand, and after the lost foam casting, the shape and position precision of the workpiece at the grooves is higher; by arranging the copper pipe and the vibrator, the molding sand can be further filled in the groove in the bottom wall of the workpiece, and the product quality is improved; the air pumping rod can be fixed at any position in the sand box, the length of the air pumping rod can be conveniently changed, and the applicability to workpieces is high.
Description
Technical Field
The invention relates to the technical field of precision casting, in particular to equipment for lost foam casting.
Background
Precision casting refers to a general name of a process for obtaining a casting with a precise size, and compared with the traditional sand casting process, the casting obtained by precision casting is more precise in size and better in surface smoothness. The precision casting includes: investment casting, ceramic casting, metal casting, pressure casting, lost foam casting and the like, and the lost foam casting is particularly suitable for producing large-volume machine tool base products.
The Chinese patent application with the prior application publication number of CN104741532A discloses a lost foam casting process, which comprises the following steps: selecting foam plastic beads → manufacturing models → combining and clustering models → coating models → vibrating modeling → pouring and replacing → cooling and cleaning.
The specific implementation mode of the process is as follows: combining the models into clusters: combining and bonding the processed models together to form a model cluster; coating a model: placing the special lost foam casting coating in a coating stirrer, adding water, stirring, and coating the special lost foam casting coating on a model cluster by using a dipping, brushing, spraying and showering method; vibration molding: placing a sand box with an air exhaust chamber on a vibration table and clamping, placing bottom sand with a certain thickness at the bottom, compacting, placing a model cluster on the vibration table, culturing and fixing the sand, applying vibration for 30-60 seconds, sealing the surface of the sand box by using a plastic film, vacuumizing the sand box by using a vacuum pump, and bonding sand grains together by using the difference between atmospheric pressure and the pressure in a casting mold; pouring and replacing: the metal liquid replaces the position of a foam mould to form the shape of a product, the pouring operation process adopts a slow-fast-slow mode and keeps continuous pouring, and the pump is stopped after the casting mould is vacuumized for 3-5 minutes; cooling and cleaning: after cooling, the casting can be lifted out of the sand box in an inclined mode or directly lifted out of the sand box.
The above prior art solutions have the following drawbacks: the bottom wall of some workpiece products is provided with a groove, and when sand grains are filled in a sand box before casting, even if a vibrating process exists, air in the groove of the workpiece cannot be discharged, the sand grains cannot completely fill the groove, and the problem that the workpiece is located in the groove and has poor form and position precision after lost foam casting can be caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide equipment for lost foam casting, which is high in form and position accuracy of a workpiece at a groove.
The technical purpose of the invention is realized by the following technical scheme: the equipment for lost foam casting comprises a jolt ramming table, a sand box arranged on the jolt ramming table and a vacuum pump positioned outside the sand box, wherein an air suction rod is arranged in the sand box and connected with an air pipe, the air pipe is communicated with an air suction end of the vacuum pump, and a filter and a vacuum meter are arranged between the air pipe and the vacuum pump; the lower end of the air suction rod is fixed on the inner bottom wall of the sand box, the upper end of the air suction rod faces upwards and is provided with an air inlet, the upper end of the air suction rod is used for being inserted into the groove of the bottom wall of the workpiece, and an air passage for communicating the air inlet with the air pipe is arranged in the air suction rod.
Through above-mentioned technical scheme, place the foam model that is used for the shaping work piece in the sand box in advance, then personnel place the air extraction rod corresponding to work piece diapire recess department, make the inlet port be located the recess, accomplish the preparation work. Then, filling sand, starting a compaction table to compact the molding sand while filling the sand, and starting a vacuum pump when the molding sand reaches the position near the air inlet hole. When the vacuum pump works, the suction force generated by the vacuum pump acts on the air inlet hole through the air pipe and the air passage, and the air in the workpiece groove is sucked by the air inlet hole, so that external sand grains can be actively filled into the workpiece groove; under the vibration of the jolt ramming table, the sand grains have strong fluidity, and the reliability of the sand grains filled into the grooves is high. After the air is exhausted from the grooves of the workpiece, the vacuum degrees in the air pipe and the filter are obviously improved, personnel can judge whether the grooves of the workpiece are completely filled with molding sand according to the number indicated by the vacuum meter, and the filter is used for preventing the suction inlet of the vacuum pump from entering the sand. Because the recess of work piece diapire can be full of the molding sand completely, then after the lost foam casting, the form and position precision that the work piece was located the recess is higher.
Preferably, the air pumping rod is separable from the sand box, the inner bottom wall of the sand box is made of ferromagnetic materials, the lower end of the air pumping rod is provided with a magnet, and the air pumping rod is fixed on the inner bottom wall of the sand box through magnet adsorption.
Through the technical scheme, the air pumping rod is fixed on the inner bottom wall of the sand box through magnet adsorption, and the fixing mode can enable the air pumping rod to be fixed at any position in the sand box, so that the sand box is convenient to use; when the plain bumper vibrates, the air pumping rod is not easy to move.
Preferably, the number of the filters is at least two, the filters are communicated through the end parts, the filter comprises a filter cartridge and a filter element arranged in the filter cartridge, and the side wall of the filter cartridge is made of transparent materials.
Through the technical scheme, the two continuous filters can provide double insurance for filtering sand grains, and prevent the suction inlet of the vacuum pump from entering the sand. When the vacuum pump works, a person can observe the amount of sand grains sucked into the filter cylinder through the filter cylinder, and whether the grooves of the workpiece are completely filled with molding sand is judged in an auxiliary mode, so that the vacuum pump is convenient.
Preferably, the air pumping rod comprises a top located at the top end, a base located at the bottom end, and an extension rod arranged between the top and the base, the air inlet and the air passage are both located on the top, and slots for inserting and fixing the end parts of the extension rod are both arranged on the top and the base.
Through above-mentioned technical scheme, the extension rod has different length specifications to supply to change, and personnel can select the extension rod according to the height of locating of work piece recess, make the top be located the recess of work piece just. The person can conveniently manufacture the extension rod with the required length by cutting on the bar stock.
Preferably, the air inlet holes are arranged in the vertical direction, first channels which correspond to the air inlet holes one to one are arranged in the plug, the air inlet holes are communicated with the air passages through the first channels, the first channels are bent in a U shape, and the U-shaped openings of the first channels face upwards.
Through the technical scheme, when air passes through the first channel, if a small amount of sand grains are mixed in the air, the first channel is not easy to be blocked by the sand grains. After sand completely overflows the air inlet, a large amount of sand is positioned at the air inlet, the sand is easily blocked in the first U-shaped bent channel, at the moment, the first channel is blocked, the corresponding air inlet is in a closed state, and the sand is prevented from being sucked into the air passage in a large amount.
Preferably, the top of the ejector is provided with a plurality of copper pipes, two ends of each copper pipe are communicated, and one end of each copper pipe is communicated with the air passage.
Through the technical scheme, the copper pipe can be bent by breaking the copper pipe, so that the end part of the copper pipe departing from the ejector head is positioned at each corner of the top of the groove of the workpiece. After the vacuum pump operation, the tip of copper pipe also produces suction, and the air escape in the corner of copper pipe tip with recess top makes the packing of molding sand more abundant, further improves the morpheme quality after the product shaping.
Preferably, the top end of the top head is in threaded connection with a top cover, the copper pipes are arranged on the top cover, a second channel is arranged in the top cover, and the second channel communicates the air passages with all the copper pipes.
Through the technical scheme, the top cover can be conveniently disassembled and assembled with the top head, and after the top cover is separated from the top head, workers can conveniently clean sand grains in the first channel and the second channel.
Preferably, a vibrator is fixed on the plug.
Through above-mentioned technical scheme, the vibrator during operation can transmit the vibration to the top, when the air in the passageway one, if mix a small amount of sand grains in the air, the difficult passageway that blocks up of sand grain under the vibration effect of vibrator. When sand completely overflows the air inlet hole or the top end of the copper pipe, excessive sand can still be blocked in the first channel, and the vibration of the vibrator is insufficient to dredge the corresponding first channel.
Preferably, the gas pipe is a metal pipe.
Through above-mentioned technical scheme, the trachea of metal system has higher structural strength, and when the trachea received molding sand pressure along circumference, the trachea also was difficult for producing deformation.
In summary, compared with the prior art, the beneficial effects of the invention are as follows:
1. the equipment for lost foam casting can ensure that the grooves on the bottom wall of the workpiece are filled with the molding sand, and after the lost foam casting, the shape and position precision of the workpiece at the grooves is higher;
2. by arranging the copper pipe and the vibrator, the molding sand can be further filled in the groove in the bottom wall of the workpiece;
3. the air pumping rod can be fixed at any position in the sand box, the length of the air pumping rod can be conveniently changed, and the applicability of the lost foam casting equipment to workpieces is high.
Drawings
FIG. 1 is an overall view of an apparatus for lost foam casting according to an embodiment;
FIG. 2 is a partial view of an apparatus for lost foam casting according to an embodiment;
fig. 3 is a sectional view of the plug of the embodiment, mainly highlighting the internal structure of the plug.
In the figure, 10, a tapping table; 1. a sand box; 2. a vacuum pump; 3. a suction rod; 4. an air tube; 41. a filter; 42. a vacuum gauge; 5. ejecting the head; 6. an extension pole; 7. a base; 71. a magnet; 61. a slot; 51. an air inlet; 52. an airway; 53. a first channel; 8. a top cover; 81. a second channel; 82. a copper pipe; 9. a vibrator; 411. a filter cartridge; 412. and (3) a filter element.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the equipment for lost foam casting disclosed by the invention comprises a jolt ramming table 10, a sand box 1 arranged on the jolt ramming table 10 and a vacuum pump 2 positioned outside the sand box 1, wherein an air suction rod 3 is arranged in the sand box 1, the air suction rod 3 is connected with an air pipe 4, the air pipe 4 is communicated with an air suction end of the vacuum pump 2, and a filter 41 and a vacuum meter 42 are arranged between the air pipe 4 and the vacuum pump 2. The sand box 1 is made of iron, and the material of the sand box 1 can also be other ferromagnetic materials.
Referring to fig. 2, the pump rod 3 includes an extension rod 6, a head 5 at the top end of the extension rod 6, and a base 7 at the bottom end of the extension rod 6. The base 7 is flat, the plate surface of the base 7 is perpendicular to the axis of the extension rod 6, and a magnet 71 is embedded and fixed in the base 7. The air suction rod 3 is fixed on the inner bottom wall of the sand box 1 through the magnet 71 in an adsorption mode, and the air suction rod 3 can be fixed at any position in the sand box 1 in a fixing mode, so that the fixing is convenient. When the jolt ramming table 10 vibrates, the base 7 is not easy to move, and after sand grains in the sand box 1 are increased, the base 7 and the extension rod 6 are limited by the sand grains, so that the effect of limiting the spontaneous movement of the air pumping rod 3 is further achieved.
The plug 5 and the base 7 are respectively provided with a slot 61 for inserting and fixing the end part of the extension rod 6, and the extension rod 6 has different length specifications for replacement. The personnel can select the extension rod 6 according to the height of the groove of the workpiece, so that the top 5 is just positioned in the groove of the workpiece. The diameter of the extension rod 6 is the same along its length, and a person can conveniently manufacture the extension rod 6 of a desired length by cutting it from a bar stock.
Referring to fig. 2 and 3, the axes of the plug 5 and the extension rod 6 are vertical, and the plug 5 is used for being inserted into a groove in the bottom wall of a workpiece. The outer side wall of the plug 5 is provided with a plurality of air inlet holes 51, an air passage 52 and a first passage 53 which communicates the air passage 52 with the air inlet holes 51 one by one are arranged inside the plug 5, and the end part of the air passage 52 departing from the first passage 53 is communicated with the air pipe 4. The air inlet hole 51 is provided with a plurality of formation groups along the circumference of the plug 5, the air inlet hole 51 is provided with a plurality of groups along the axial direction of the plug 5, and the first channel 53 is bent in a U shape and the U-shaped opening faces upwards.
The top end of the top head 5 is in threaded connection with the top cover 8, a second channel 81 is arranged in the top cover 8, and the second channel 81 is communicated with the air channel 52. Four copper pipes 82 are connected to the top cover 8, two ends of each copper pipe 82 are communicated, one end of each copper pipe 82 is communicated with the second channel 81, the other end of each copper pipe 82 extends in the direction departing from the top cover 8, and the second channel 81 is used for communicating the air passages 52 with all the copper pipes 82. The person can bend the copper tubes 82 by snapping the copper tubes so that the ends of the four copper tubes 82 facing away from the top cover 8 are located at the corners of the top of the workpiece recess.
The vibrator 9 is fixed on the outer side wall of the top 5, and the vibrator 9 is a mobile phone vibrator and is small in size. When the vibrator 9 works, vibration can be transmitted to the plug 5, and when air passes through the first channel 53 and the second channel 81, if a small amount of sand grains are mixed in the air, the sand grains are not easy to block the corresponding channels under the vibration action of the vibrator 9. When the sand particles completely overflow the air inlet hole 51 or the top end of the copper pipe 82, the sand particles are still blocked in the corresponding channel, and the vibration of the vibrator 9 is not enough to dredge the corresponding channel.
The working conditions of the lost foam casting equipment are as follows: placing a foam model for forming a workpiece in a sand box 1 in advance, wherein the surface of the foam model is coated with a fireproof coating and dried; then, the worker places the suction rod 3 corresponding to the groove of the bottom wall of the workpiece, so that the plug 5 is positioned in the groove, and the end part of the copper pipe 82 is positioned at each corner of the top of the groove, thereby completing the preparation work. Then, the sand is filled, the compaction table 10 is started to compact the molding sand while the sand is filled, and when the molding sand reaches the vicinity of the plug 5, the person starts the vacuum pump 2 and the vibrator 9.
When the vacuum pump 2 works, the suction force generated by the vacuum pump 2 acts on the air inlet 51 through the air pipe 4, the air passage 52 and the first channel 53, and the air in the workpiece groove is sucked by the air inlet 51, so that external sand grains can be actively filled into the workpiece groove; under the vibration of the jolt ramming table 10, the sand grains have strong fluidity, and the reliability of the spontaneous filling of the sand grains into the grooves is high. When the sand filling height is higher than the air inlet hole 51, a large amount of sand is positioned at the air inlet hole 51, the sand is easily blocked in the first U-shaped bent channel 53, at the moment, the first channel 53 is blocked, the corresponding air inlet hole 51 is in a closed state, and the sand is prevented from being sucked into the air passage 52 in a large amount.
The suction that vacuum pump 2 produced also acts on the outer tip of copper pipe 82 through passageway two 81, and after inlet port 51 blockked up because of the improvement of molding sand height, the suction of vacuum pump 2 concentrated in the tip of copper pipe 82 through passageway two 81, and the air in recess top corner is discharged to copper pipe 82 tip, makes the molding sand fill in the recess of work piece completely. The vibration generated by the vibrator 9 during the air suction of the plug 5 prevents sand from clogging the first and second passages 53 and 81.
After the grooves of the workpiece are exhausted with air, the vacuum degrees in the air pipe 4 and the filter 41 are obviously improved, and personnel can judge whether the grooves of the workpiece are completely filled with molding sand according to the indication of the vacuum meter 42 and the amount of the sucked sand observed through the filter cartridge 411, which is more convenient. Two successive filters 41 provide a double safety against sand filtration, preventing sand from entering the suction inlet of the vacuum pump 2.
After the grooves are filled with the shaped sand, the personnel close the power supplies of the compaction table 10, the vacuum pump 2 and the vibrator 9, and then carry out the subsequent processes of lost foam casting, which are not described in detail herein. Because the recess of work piece diapire can be full of the molding sand completely, then after the lost foam casting, the form and position precision that the work piece was located the recess is higher. Before casting, the air pipe 4, the top 5 and the top cover 8 need to be reversely blown to clean sand grains inside.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. The utility model provides an equipment is used in lost foam casting, includes plain bumper (10), locates sand box (1) on plain bumper (10), characterized by: the sand box is characterized by further comprising a vacuum pump (2) located outside the sand box (1), wherein an air suction rod (3) is arranged in the sand box (1), the air suction rod (3) is connected with an air pipe (4), the air pipe (4) is communicated with an air suction end of the vacuum pump (2), and a filter (41) and a vacuum meter (42) are arranged between the air pipe (4) and the vacuum pump (2); the lower end of the air suction rod (3) is fixed on the inner bottom wall of the sand box (1), the upper end of the air suction rod (3) faces upwards and is provided with an air inlet (51), the upper end of the air suction rod (3) is used for being inserted into a groove in the bottom wall of a workpiece, and an air passage (52) for communicating the air inlet (51) with the air pipe (4) is arranged in the air suction rod (3);
the air pumping rod (3) comprises a top head (5) positioned at the top end, a base (7) positioned at the bottom end and an extension rod (6) arranged between the top head (5) and the base (7), the air inlet (51) and the air passage (52) are both positioned on the top head (5), and slots (61) for inserting and fixing the end part of the extension rod (6) are both arranged on the top head (5) and the base (7);
the air inlet holes (51) are arranged in a plurality of vertical directions, first channels (53) which correspond to the air inlet holes (51) one to one are arranged in the ejector head (5), the air inlet holes (51) are communicated with the air channel (52) through the first channels (53), and the first channels (53) are bent in a U shape, and the U-shaped openings of the first channels face upwards.
2. The apparatus for lost foam casting as set forth in claim 1, wherein: the air suction rod (3) is separable from the sand box (1), the inner bottom wall of the sand box (1) is made of ferromagnetic materials, a magnet (71) is arranged at the lower end of the air suction rod (3), and the air suction rod (3) is fixed on the inner bottom wall of the sand box (1) in an adsorption mode through the magnet (71).
3. The apparatus for lost foam casting as set forth in claim 1, wherein: the number of the filters (41) is at least two, the filters (41) are communicated through the end parts, the filters (41) comprise filter cartridges (411) and filter elements (412) arranged in the filter cartridges (411), and the side walls of the filter cartridges (411) are made of transparent materials.
4. The apparatus for lost foam casting as set forth in claim 1, wherein: the top of the ejector head (5) is provided with a plurality of copper pipes (82), two ends of each copper pipe (82) are communicated, and one end of each copper pipe (82) is communicated with the air channel (52).
5. The apparatus for lost foam casting as set forth in claim 4, wherein: the top end of the top head (5) is in threaded connection with a top cover (8), the copper pipes (82) are arranged on the top cover (8), a second channel (81) is arranged in the top cover (8), and the second channel (81) enables the air passages (52) to be communicated with all the copper pipes (82).
6. The apparatus for lost foam casting as set forth in claim 1, wherein: and a vibrator (9) is fixed on the top head (5).
7. The apparatus for lost foam casting as set forth in claim 1, wherein: the air pipe (4) is a metal pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910467879.3A CN110039006B (en) | 2019-05-31 | 2019-05-31 | Lost foam casting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910467879.3A CN110039006B (en) | 2019-05-31 | 2019-05-31 | Lost foam casting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110039006A CN110039006A (en) | 2019-07-23 |
| CN110039006B true CN110039006B (en) | 2020-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910467879.3A Active CN110039006B (en) | 2019-05-31 | 2019-05-31 | Lost foam casting equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN110039006B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113714471B (en) * | 2021-11-02 | 2022-02-15 | 常州市富顺机械有限公司 | Lost foam casting device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59110450A (en) * | 1982-12-16 | 1984-06-26 | Isuzu Motors Ltd | Forming method of casting sand mold |
| JPH105929A (en) * | 1996-06-25 | 1998-01-13 | Aisin Takaoka Ltd | Method for filling up molding sand and device therefor |
| DE102012019181A1 (en) * | 2012-09-28 | 2013-03-21 | Daimler Ag | Plant, useful for manufacturing sand cores for a metal casting, comprises a core tool that comprises a core mold fillable with a sand-containing molding material and a feed device, by which the core mold is more supplied to gas |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU808194A1 (en) * | 1979-01-25 | 1981-02-28 | Предприятие П/Я Р-6762 | Casting mould |
| US4828006A (en) * | 1987-10-13 | 1989-05-09 | Vander Jagt A Dean | Lost foam pour box and lost foam casting process |
| RU2020026C1 (en) * | 1991-09-30 | 1994-09-30 | Киевское научно-производственное объединение по автоматизации и механизации технологии производства "Камет" | Method of making moulds for vacuum-film moulding |
| CN1846900A (en) * | 2006-04-24 | 2006-10-18 | 王兴雷 | Casting process of thin-wall pipe and spiral roller |
| CN104801666A (en) * | 2015-03-25 | 2015-07-29 | 池州市华兴天骑精密机械铸造有限公司 | Air exhaust device of casting mold |
-
2019
- 2019-05-31 CN CN201910467879.3A patent/CN110039006B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59110450A (en) * | 1982-12-16 | 1984-06-26 | Isuzu Motors Ltd | Forming method of casting sand mold |
| JPH105929A (en) * | 1996-06-25 | 1998-01-13 | Aisin Takaoka Ltd | Method for filling up molding sand and device therefor |
| DE102012019181A1 (en) * | 2012-09-28 | 2013-03-21 | Daimler Ag | Plant, useful for manufacturing sand cores for a metal casting, comprises a core tool that comprises a core mold fillable with a sand-containing molding material and a feed device, by which the core mold is more supplied to gas |
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| CN110039006A (en) | 2019-07-23 |
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Denomination of invention: Equipment for lost foam casting Effective date of registration: 20211229 Granted publication date: 20200908 Pledgee: Bank of China Limited Taizhou Luqiao District sub branch Pledgor: TAIZHOU JUDONG PRECISION CASTING Co.,Ltd. Registration number: Y2021330002724 |
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