CN108044060A - A kind of sand core dip-coating frock and sand core dip coating apparatus - Google Patents
A kind of sand core dip-coating frock and sand core dip coating apparatus Download PDFInfo
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- CN108044060A CN108044060A CN201810102518.4A CN201810102518A CN108044060A CN 108044060 A CN108044060 A CN 108044060A CN 201810102518 A CN201810102518 A CN 201810102518A CN 108044060 A CN108044060 A CN 108044060A
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- Prior art keywords
- sand core
- coating
- dip
- bearing frame
- support
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- 238000003618 dip coating Methods 0.000 title claims abstract description 101
- 238000001548 drop coating Methods 0.000 claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 22
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 238000007598 dipping method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
- B22C23/02—Devices for coating moulds or cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
The present invention provides a kind of sand core dip-coating frock and sand core dip coating apparatus, are related to machinery and equipment technology field, which includes support baseboard and multiple sand core dip-coating frocks.Each sand core dip-coating frock includes sand core rack, bearing frame, frock overlay structure and drop coating support construction, and sand core rack is fixedly connected on the one side of bearing frame, for housing sand core；Frock overlay structure includes multiple overlapping pillars being arranged in parallel, multiple overlapping pillars are uniformly arranged on bearing frame and are stretched out towards bearing frame close to the one side of sand core rack, drop coating support construction is fixedly connected on the end face of bearing frame, is used to support bearing frame.Compared to the prior art, a kind of sand core dip-coating frock provided by the invention can realize the dip-coating simultaneously of multiple sand cores, improve dip-coating efficiency, while facilitate and carry out drop coating operation, improve the quality of sand core.
Description
Technical field
The present invention relates to machinery and equipment technology fields, are soaked in particular to a kind of sand core dip-coating frock and sand core
Coating device.
Background technology
With the raising of environmental protection requirement, the development of auto manufacturing technology, the technology requirement to critical component-engine
More stringent, the in addition extensive application of turbocharging technology proposes the relevant auxiliary products standard of engine harsher
Index.Particularly turbocharger housing and bear box product.In the production of turbocharger housing and bear box
Cheng Zhong, coremaking operation are particularly critical.Because the sand core that coremaking obtains, it is related to the inner flow passage quality of product, the light including surface
Cleanliness, dimensional stability.This is very crucial to the operation is stable of engine.For this reason, it may be necessary to the working face in sand core uses coating
It is surface-treated.Due to many sand cores according to casting technique requirement needs in sand core surface dip-coating material, current dipping process
It is that sand core is put into paint can by hand, dip-coating region is difficult to control, and it is laborious to take a lot of work, and quality is not easy to ensure, production efficiency
It is low.
In addition, cylinder blank oil passage sand core is numerous, it is common practice that using upright casting technique productions cylinder blank, oil passage sand core
It is designed as single sand core more.Single oil passage sand core size is smaller but large number of, at this stage by the way of single sand core dip-coating
Dip-coating, dip-coating inefficiency.Prolonged drop coating is needed to operate after sand core dip-coating simultaneously, to ensure that core coating will not local heap
The defects of product, formation coating buildup.And in actual production process, prolonged drop coating operation is extremely difficult to, it is more after sand core dip-coating
There are coating buildup, it is necessary to which the later stage clears up.
In view of this, the dip-coating simultaneously of multiple sand cores can be realized by designing and manufacturing one kind, while can be carried out prolonged
Drop coating operates, and ensures the sand core dip-coating frock of the time requirement of coating drop coating and is just particularly important.
The content of the invention
It is an object of the invention to provide a kind of sand core dip-coating frocks, can realize the dip-coating simultaneously of multiple sand cores, dip-coating
It is efficient, while prolonged drop coating operation can be carried out, ensure the time requirement of coating drop coating.
The present invention is realized using following technical solution.
A kind of sand core dip-coating frock is supported including sand core rack, bearing frame, frock overlay structure and drop coating and tied
Structure, sand core rack are fixedly connected on the one side of bearing frame, for housing sand core；Frock overlay structure includes multiple parallel set
The overlapping pillar put, multiple overlapping pillars be uniformly arranged on bearing frame and towards bearing frame close to sand core rack one
Side is stretched out, and drop coating support construction is fixedly connected on the end face of bearing frame, is used to support bearing frame.
Further, bearing frame sand core rack includes multiple sand cores placement supporting spring, and each sand core places the two of supporting spring
End is fixedly connected on bearing frame, and it is arranged in parallel that multiple sand cores place supporting spring.
Further, the middle part that each sand core places supporting spring has arc supporting part, and multiple arcs supporting part is collectively formed
One containing groove, for housing sand core.
Further, the bottom of bearing frame is additionally provided with multiple spacing projections, multiple spacing projections and multiple Chong Die branch
Column sets up separately correspondingly in the both sides of bearing frame, and each spacing projection and corresponding overlapping pillar coaxial arrangement.
Further, each the top of overlapping pillar offers limiting slot, and the shape of limiting slot is engaged with spacing projection.
Further, drop coating support construction includes the first support base and the second support base, the first support base and the second support
Seat is fixedly connected in the end face of bearing frame and interval setting.
Further, the first support base and the rectangular strip of the second support base, and the first support base and the second support base
Extending direction be overlapped pillar extending direction it is consistent.
Further, bearing frame includes first support bar, second support bar, head rod and the second connecting rod,
First support bar, head rod, second support bar and the second connecting rod connect and form a rectangle frame, sand core from beginning to end successively
Rack is connected to first support bar and second support bar, and drop coating support construction is fixedly connected on the second supporting rack away from
One side surface of one supporting rack.
Compared to the prior art, a kind of sand core dip-coating frock provided by the invention has the advantages that：
Sand core rack is fixedly connected on the one side of bearing frame, for holding by sand core dip-coating frock of the present invention
Put sand core；Multiple overlapping pillars are uniformly arranged on bearing frame and are stretched towards bearing frame close to the one side of sand core rack
Go out, drop coating support construction is fixedly connected on the end face of bearing frame, is used to support bearing frame.In actual use,
Due to the presence of multiple overlapping pillars so that multiple sand core dip-coating frocks can be stacked with, and be facilitated multiple sand core dip-coating works
Dress is sent into dipping unit and carries out immersion-coating operation together.The end face of bearing frame is provided with drop coating support construction simultaneously, it can be by dip-coating
Sand core dip-coating frock after finishing, which is placed on platform, carries out prolonged drop coating operation, ensure that core coating will not local heap
Product, improves sand core quality.Compared to the prior art, a kind of sand core dip-coating frock provided by the invention can realize multiple sand
Core dip-coating simultaneously, improves dip-coating efficiency, while facilitates and carry out drop coating operation, improves the quality of sand core.
Multiple sand cores placement supporting spring is arranged in parallel by sand core dip-coating frock of the present invention, and each sand core places supporting spring
Both ends be fixedly connected on bearing frame, and each sand core place supporting spring middle part have arc supporting part, multiple arcs
A containing groove is collectively formed in shape supporting part, for housing sand core.Compared to the prior art, a kind of sand core leaching provided by the invention
Apply frock, can preferably fixed column sand core, sand core is avoided to come off or drop in the handling process, reduces fortuitous event
Occur.
Sand core dip-coating frock of the present invention is additionally provided with multiple spacing projections, multiple limits in the bottom of bearing frame
Position pillar sets up separately correspondingly with multiple Chong Die pillars in the both sides of bearing frame, and each spacing projection and corresponding /V
Pillar is coaxially disposed.The top of each overlapping pillar offers limiting slot, and the shape of limiting slot is engaged with spacing projection.Pass through
The cooperation of spacing projection and limiting slot so that multiple sand core dip-coating frocks can be firmly coupled to each other, and avoid what is fallen apart
It happens.
Another object of the present invention is to provide a kind of sand core dip coating apparatus, the dip-coating simultaneously of multiple sand cores can be realized,
Dip-coating is efficient.
In order to achieve the above objectives, the present invention is realized using following technical solution.
A kind of sand core dip coating apparatus, including support baseboard and multiple sand core dip-coating frocks, multiple sand core dip-coating frock overlappings
It sets and forms dip-coating laminated assembly, support baseboard is connected to the bottom of dip-coating laminated assembly.Each sand core dip-coating frock includes
Sand core rack, bearing frame, frock overlay structure and drop coating support construction, sand core rack are fixedly connected on bearing frame
One side, for housing sand core；Frock overlay structure includes multiple overlapping pillars being arranged in parallel, and multiple overlapping pillars are uniformly set
It puts on bearing frame and is stretched out towards bearing frame close to the one side of sand core rack, drop coating support construction, which is fixedly connected on, holds
The end face of frame is carried, is used to support bearing frame.
Further, multiple recirculation holes are offered on support baseboard.
Compared to the prior art, a kind of sand core dip coating apparatus provided by the invention has the advantages that：
A kind of sand core dip coating apparatus provided by the invention, multiple sand core dip-coating frocks, which overlap and form dip-coating, stacks group
Part, support baseboard are connected to the bottom of dip-coating laminated assembly.It, can be easily by multiple sand by the supporting role of support baseboard
Core dip-coating frock is put into dipping unit, improves dip-coating efficiency, while is also convenient for being shifted.
Description of the drawings
It in order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of scope, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structure diagram at the first visual angle of sand core dip-coating frock that first embodiment of the invention provides；
Fig. 2 is the overlay structure schematic diagram for the sand core dip-coating frock that first embodiment of the invention provides；
Fig. 3 is the structure diagram at the second visual angle of sand core dip-coating frock that first embodiment of the invention provides；
Fig. 4 is the attachment structure schematic diagram of drop coating support construction in Fig. 1.
Icon：100- sand core dip-coating frocks；110- sand core racks；111- sand cores place supporting spring；113- arc supporting parts；
130- bearing frames；131- first support bars；133- second support bars；135- head rods；The second connecting rods of 137-；150-
Frock overlay structure；151- is overlapped pillar；153- spacing projections；170- drop coating support constructions；The first support bases of 171-；173-
Two support bases.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.The present invention implementation being usually described and illustrated herein in the accompanying drawings
The component of example can configure to arrange and design with a variety of.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiments obtained without creative efforts belong to the model that the present invention protects
It encloses.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the present invention, it is necessary to explanation, term " " center ", " on ", " vertical ", " level ", " interior ", " outer "
It is to be used to based on orientation shown in the drawings or position relationship or when invention product use when the orientation of instructions or position relationship
The orientation or position relationship often put are for only for ease of the description present invention and simplify description rather than instruction or imply signified
Device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that the present invention
Limitation.In addition, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that indicating or implying relatively important
Property.
In the description of the present invention, it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ",
" connected ", " installation ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or one
It connects body；Can be mechanical connection or electrical connection；It can be directly connected, it can also be indirect by intermediary
It is connected, can is the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
Below in conjunction with the accompanying drawings, elaborate to some embodiments of the present invention.In the case where there is no conflict, it is following
Feature in embodiment can be mutually combined.
First embodiment
With reference to referring to Fig. 1 and Fig. 2, present embodiments provide a kind of sand core dip-coating frock 100, including sand core rack 110,
Bearing frame 130, frock overlay structure 150 and drop coating support construction 170, sand core rack 110 are fixedly connected on bearing frame
The one side of frame 130, for housing sand core.Frock overlay structure 150 is arranged on bearing frame 130, for being soaked in multiple sand cores
It applies when frock 100 overlaps and is connected on adjacent bearing frame 130.Drop coating support construction 170 is fixedly connected on bearing frame
The end face of frame 130 is used to support bearing frame 130.
Sand core rack 110 includes multiple sand cores and places supporting spring 111, and the both ends that each sand core places supporting spring 111 are fixed
It is connected on bearing frame 130, it is arranged in parallel that multiple sand cores place supporting spring 111.
In the present embodiment, the middle part that each sand core places supporting spring 111 has arc supporting part 113, multiple arcs carrying
A containing groove is collectively formed in portion 113, for housing sand core.
In other preferred embodiments of the invention, multiple sand cores are placed supporting spring 111 and are integrally formed and in two neighboring sand
Core offers air channel between placing supporting spring 111.
Bearing frame 130 includes first support bar 131, second support bar 133, head rod 135 and second and connects
Bar 137, head and the tail connect successively for first support bar 131, head rod 135,133 and second connecting rod 137 of second support bar
And a rectangle frame is formed, sand core rack 110 is connected to first support bar 131 and second support bar 133, drop coating support knot
Structure 170 is fixedly connected on a side surface of second supporting rack away from the first supporting rack.
In the present embodiment, first support bar 131 and the cross section of second support bar 133 are rectangular, head rod 135
With the circular in cross-section of the second connecting rod 137 so that rectangle frame is more firm, and when overlapping is not easily to fall off.
Referring to Fig. 3, frock overlay structure 150 includes multiple overlapping pillars 151 being arranged in parallel, multiple overlapping pillars 151
It is uniformly arranged on bearing frame 130 and is stretched out towards bearing frame 130 close to the one side of sand core rack 110.
The bottom of bearing frame 130 is additionally provided with multiple spacing projections 153, multiple spacing projections 153 and multiple Chong Die branch
Column 151 sets up separately correspondingly in the both sides of bearing frame 130, and each spacing projection 153 and corresponding overlapping pillar 151 are same
Axis is set.
In the present embodiment, spacing projection 153 is 4 with the quantity of Chong Die pillar 151, the company of 4 overlapping pillars 151
Line is rectangular, and multiple sand core dip-coating frocks 100 are steadily piled up.
In the present embodiment, each the top of overlapping pillar 151 offers limiting slot, the shape and spacing projection of limiting slot
153 are engaged.When multiple sand core dip-coating frocks 100 overlap, each spacing projection 153 stretches into adjacent overlapping pillar
Limiting slot on 151 carries out /V to multiple sand core dip-coating frocks 100 in the horizontal direction, avoids misplacing and slide.
In other preferred embodiments of the invention, the bottom of bearing frame 130 offers multiple limiting grooves, multiple limits
Position groove is corresponded with multiple Chong Die pillars 151, when multiple sand core dip-coating frocks 100 overlap, is each overlapped pillar
151 stretch into adjacent limiting groove, carry out /V to multiple sand core dip-coating frocks 100 in the horizontal direction, avoid misplacing and slide
Fall.
Referring to Fig. 4, drop coating support construction 170 includes the first support base 171 and the second support base 173, the first support base 171
It is fixedly connected with the second support base 173 in the end face of bearing frame 130 and interval setting.
In the present embodiment, the first support base 171 and the rectangular strip of the second support base 173, and the first support base 171
It is consistent with the extending direction for being overlapped pillar 151 with the extending direction of the second support base 173.
It is worth noting that, the first support base 171 and the second support base 173 are not restricted to rectangular strip herein,
Can also be disc-shaped or T-shaped rack-like, as long as bearing frame 130 can be fixedly supported so that sand core drop coating operates energy
The first support base 171 and the shape of the second support base 173 enough smoothly completed is within protection scope of the present invention.
In conclusion present embodiments providing a kind of sand core dip-coating frock 100, sand core rack 110 is fixedly connected on
The one side of bearing frame 130, for housing sand core.Multiple overlapping pillars 151 are uniformly arranged on bearing frame 130 and towards holding
It carries frame 130 to stretch out close to the one side of sand core rack 110, drop coating support construction 170 is fixedly connected on the one of bearing frame 130
End face is used to support bearing frame 130.In actual use, due to the presence of multiple overlapping pillars 151 so that multiple
Sand core dip-coating frock 100 can be stacked with, and facilitate and multiple sand core dip-coating frocks 100 are sent into dipping unit progress dip-coating behaviour together
Make.The end face of bearing frame 130 is provided with drop coating support construction 170 simultaneously, it can be by the sand core dip-coating frock after the completion of dip-coating
100 are placed on platform and carry out prolonged drop coating operation, ensure that core coating will not local accumulation, improve sand core matter
Amount.Multiple sand cores placement supporting spring 111 is arranged in parallel simultaneously, the both ends of each sand core placement supporting spring 111, which are fixedly connected with, is holding
It carries on frame 130, and there is arc supporting part 113, multiple arcs supporting part 113 at the middle part that each sand core places supporting spring 111
A containing groove is collectively formed, for housing sand core.Compared to the prior art, a kind of sand core dip-coating frock provided by the invention
100, it can realize the dip-coating simultaneously of multiple sand cores, improve dip-coating efficiency, while facilitate and carry out drop coating operation, improve sand core
Quality.
Second embodiment
A kind of sand core dip coating apparatus is present embodiments provided, including support baseboard (not shown) and multiple sand core dip-coating frocks
100, the wherein basic structure of sand core dip-coating frock 100 and principle and the technique effect of generation is identical with first embodiment, for letter
It describes, the present embodiment part does not refer to part, can refer to corresponding contents in first embodiment.
Sand core dip coating apparatus provided in this embodiment, multiple sand core dip-coating frocks 100, which overlap and form dip-coating, to be stacked
Component, support baseboard are connected to the bottom of dip-coating laminated assembly.Each sand core dip-coating frock 100 includes sand core rack 110, holds
It carries frame 130, frock overlay structure 150 and drop coating support construction 170, sand core rack 110 and is fixedly connected on bearing frame
130 one side, for housing sand core；Frock overlay structure 150 includes multiple overlapping pillars 151 being arranged in parallel, multiple overlappings
Pillar 151 is uniformly arranged on bearing frame 130 and is stretched out towards bearing frame 130 close to the one side of sand core rack 110, drop
The end face that support construction 170 is fixedly connected on bearing frame 130 is applied, is used to support bearing frame 130.
In the present embodiment, multiple recirculation holes are offered on support baseboard, it is convenient to be sent by multiple sand core dip-coating frocks 100
It is flowed through during entering dipping unit for lotion.
In conclusion present embodiments providing a kind of sand core dip coating apparatus, multiple sand core dip-coating frocks 100 overlap simultaneously
Dip-coating laminated assembly is formed, support baseboard is connected to the bottom of dip-coating laminated assembly.It, can be with by the supporting role of support baseboard
Multiple sand core dip-coating frocks 100 are easily put into dipping unit, dip-coating efficiency is improved, while is also convenient for being shifted.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of sand core dip-coating frock, which is characterized in that including sand core rack, bearing frame, frock overlay structure and drop
Support construction is applied, the sand core rack is fixedly connected on the one side of the bearing frame, for housing sand core；The frock weight
Stack structure include multiple overlapping pillars being arranged in parallel, it is multiple it is described overlapping pillars be uniformly arranged on the bearing frame and to
It the bearing frame to stretch out close to the one side of the sand core rack, the drop coating support construction is fixedly connected on the carrying
The end face of frame is used to support the bearing frame.
2. sand core dip-coating frock according to claim 1, which is characterized in that the bearing frame sand core rack includes more
A sand core places supporting spring, and the both ends that each sand core places supporting spring are fixedly connected on the bearing frame, multiple described
It is arranged in parallel that sand core places supporting spring.
3. sand core dip-coating frock according to claim 2, which is characterized in that each sand core places the middle part tool of supporting spring
There is arc supporting part, a containing groove is collectively formed in multiple arc supporting parts, for housing the sand core.
4. sand core dip-coating frock according to claim 1, which is characterized in that the bottom of the bearing frame is additionally provided with more
A spacing projection, multiple spacing projections set up separately correspondingly with multiple Chong Die pillars the two of the bearing frame
Side, and each spacing projection and the corresponding overlapping pillar coaxial arrangement.
5. sand core dip-coating frock according to claim 4, which is characterized in that the top of each overlapping pillar opens up limited
Position slot, the shape of the limiting slot are engaged with the spacing projection.
6. sand core dip-coating frock according to claim 1, which is characterized in that the drop coating support construction includes the first support
Seat and the second support base, first support base and second support base are fixedly connected in the end face of the bearing frame simultaneously
It is arranged at intervals.
7. sand core dip-coating frock according to claim 6, which is characterized in that first support base and the described second support
The rectangular strip of seat, and the extending direction of the extending direction of the first support base and second support base and the Chong Die pillar
Unanimously.
8. sand core dip-coating frock according to claim 1, which is characterized in that the bearing frame include first support bar,
Second support bar, head rod and the second connecting rod, it is the first support bar, the head rod, second described
Strut and second connecting rod connect and form a rectangle frame from beginning to end successively, and the sand core rack is connected to described
First support bar and the second support bar, the drop coating support construction are fixedly connected on second supporting rack away from described the
One side surface of one supporting rack.
9. a kind of sand core dip coating apparatus, which is characterized in that including support baseboard and multiple such as claim 1-8 any one of them
Sand core dip-coating frock, multiple sand core dip-coating frocks overlap and form dip-coating laminated assembly, the support baseboard connection
In the bottom of the dip-coating laminated assembly.
10. sand core dip coating apparatus according to claim 9, which is characterized in that multiple streams are offered on the support baseboard
Through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810102518.4A CN108044060A (en) | 2018-02-01 | 2018-02-01 | A kind of sand core dip-coating frock and sand core dip coating apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810102518.4A CN108044060A (en) | 2018-02-01 | 2018-02-01 | A kind of sand core dip-coating frock and sand core dip coating apparatus |
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| CN108044060A true CN108044060A (en) | 2018-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756741A (en) * | 2019-11-29 | 2020-02-07 | 共享智能铸造产业创新中心有限公司 | Sand shell for packing sand core |
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