CN110947920B - Sand box for lost foam casting process - Google Patents
Sand box for lost foam casting process Download PDFInfo
- Publication number
- CN110947920B CN110947920B CN201911310814.4A CN201911310814A CN110947920B CN 110947920 B CN110947920 B CN 110947920B CN 201911310814 A CN201911310814 A CN 201911310814A CN 110947920 B CN110947920 B CN 110947920B
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- sand
- box body
- outer box
- ventilation
- wall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/01—Flasks; Accessories therefor for vacuum-sealed moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/12—Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
Abstract
The invention relates to a sand box for a lost foam casting process, which comprises an outer box body, an inner box body and a ventilation mechanism, wherein the inner box body is arranged in the outer box body, the ventilation mechanism is arranged between the outer box body and the inner box body, ventilation holes are uniformly formed in the front, rear, left and right side walls of the outer box body and the inner box body, the positions of the ventilation holes formed in the outer box body and the inner box body are in one-to-one correspondence, the ventilation holes are of a long strip structure, the two ends of each ventilation hole are of arc surface structures, and the ventilation mechanism comprises a mounting frame, a sand separation plate, a ventilation frame, a transverse connecting square pipe, a vertical. According to the invention, the vacuumizing position can be changed within a certain range in the vacuumizing process so as to improve the uniformity of tightness of each part of the sand mold, the installation frame is used for connecting the sand separation plates, the steps of assembling and disassembling the sand separation plates are reduced, the bottom sand discharging mode is adopted for discharging after molding, and the production input cost and the working strength are reduced.
Description
Technical Field
The invention relates to the field of casting equipment, in particular to a sand box for a lost foam casting process.
Background
The lost foam casting is a novel casting method which comprises the steps of bonding and combining paraffin or foam models with similar sizes and shapes to form a model cluster, coating refractory paint, drying, burying in dry quartz sand for vibration modeling, pouring under negative pressure to enable the model to be gasified, enabling liquid metal to occupy the position of the model, solidifying and cooling to form the casting.
The sand box is a key device in the lost foam casting production and is divided into a complex sand box, a simple sand box and the like according to different purposes. The prior sand box for the lost foam has some problems when in use:
a. before the metal liquid is poured into the sand box, vacuumizing operation is needed, so that the sand box is kept in a negative pressure state, the sand mould can have certain compactness, casting molding of a casting is facilitated, but the vacuumizing position in the sand box is often fixed, the uniformity of vacuum degrees at all positions in the sand box cannot be guaranteed, the compactness of the sand mould is inconsistent, and the part with poor compactness is easy to collapse in the casting molding process;
b. in order to avoid the blockage of the vacuum-pumping pipeline caused by molding sand in the vacuum-pumping process, a sand net is often arranged between the pipeline and the sand box, the sand net is mostly installed on the side wall of the sand box through connecting pieces such as bolts, and the operation is complex and the time is long when the sand net is disassembled;
c. after the molding, mechanical equipment or a manual mode is needed to turn the sand box over one hundred eighty degrees to pour out the molding sand, and then the casting is taken out, so that the working cost and the labor intensity are increased.
In order to make up the defects of the prior art, the invention provides a sand box for a lost foam casting process.
Disclosure of Invention
The technical scheme adopted by the invention to solve the technical problem is as follows: a sand box for a lost foam casting process comprises an outer box body, an inner box body and a ventilation mechanism, wherein the inner box body is placed in the outer box body, the outer box body is connected with the inner box body through the ventilation mechanism, ventilation holes are uniformly formed in the front, the rear, the left and the right side walls of the outer box body and the inner box body, the positions of the ventilation holes formed in the outer box body and the inner box body are in one-to-one correspondence, the ventilation holes are of a long strip-shaped structure, and the two ends of each ventilation hole are of; wherein:
the ventilation mechanism comprises a mounting frame, a sand separating plate, a ventilation frame, a transverse connecting square pipe, a vertical connecting square pipe, a butt joint pipe and an adjusting screw, wherein the mounting frame is mounted at the upper end of the outer box body through screws, the sand separating plate is mounted on the front, back, left and right sides of the lower end of the mounting frame in a sliding fit mode, the inner wall of the sand separating plate is connected with the ventilation frame, the vertical connecting square pipes are mounted on the front, back, left and right outer walls of the outer box body at equal intervals, the adjacent vertical connecting square pipes are connected through the transverse connecting square pipe, the transverse connecting square pipe is mutually communicated with the vertical connecting, the butt joint pipe is arranged outside the butt joint port, round through holes are uniformly arranged on the inner side of the vertical connecting square pipe from top to bottom, the round through holes correspond to the vent holes one by one, an adjusting screw is arranged on the side wall of the outer box body in a threaded connection mode, and the top end of the adjusting screw is tightly attached to the side wall of the sand separation plate; after being connected current vacuum pump and butt joint pipe, the vacuum pump just can see through the sand separating plate and the internal molding sand of frame of ventilating in carries out the evacuation operation, make the molding sand closely arrange, the mounting bracket, sand separating plate and interior box, be the joint mode between the outer box, need not to consume a large amount of time and can carry out the dismouting to the sand separating plate, can promote through rotating adjusting screw and remove at the certain limit at the relative mount frame of sand separating plate, and then change the position of frame of ventilating, make the vacuum pump can carry out the evacuation operation to the molding sand of different positions, the homogeneity of evacuation has been guaranteed.
Preferably, the side wall of the sand separation plate is uniformly provided with sand separation holes, the positions of the sand separation holes correspond to the positions of the vent holes one by one, a sand separation net is arranged in each sand separation hole, the outer side of each sand separation hole is provided with a clamping annular groove, the inner wall of each clamping annular groove is tightly attached to the side wall of the ventilating frame, and the inner wall of each clamping annular groove is uniformly provided with rubber blocks; the sand separation net can prevent the molding sand from entering the air vent formed in the outer box body, and blockage is avoided.
Preferably, the ventilation frame comprises a ventilation pipe, baffles, connecting rods and mounting rods, the ventilation pipe is clamped in the clamping annular groove, the baffles are symmetrically mounted on the left side and the right side of the ventilation pipe, the inner walls of the baffles are tightly attached to the inner wall of the inner box body in a sliding fit mode, the adjacent ventilation pipes are connected through the connecting rods, the mounting rods are mounted on the outer walls of the two ventilation pipes on the outermost side of the inner box body, the mounting rods are fixed on the inner box body through screws, and the mounting rods are of a left-right telescopic structure; insert the breather pipe back in the joint ring channel, under the connection effect of installation pole and connecting rod, the breather pipe alright carry out synchronous motion along with the sand separating plate, and then change the evacuation position, remove the in-process baffle and can play certain effect of sheltering from to the air vent on the internal box, guaranteed the leakproofness of interior box.
Sealing grooves are formed in the top end of the mounting frame, the top end of the outer box body and the top end of the inner box body, and rubber sealing strips are arranged in the sealing grooves between the top end of the mounting frame and the top ends of the outer box body and the inner box body; the sealing performance of the interior of the sand box can be ensured.
Preferably, springs are uniformly arranged between the sand separating plate and the outer box body from top to bottom, one end of each spring is arranged on the inner wall of the outer box body, the other end of each spring is connected with the pressing plate, the side wall of each pressing plate is tightly attached to the side wall of the sand separating plate, and the top end of each pressing plate is of an upward-protruding arc surface structure, so that the sand separating plate can be conveniently inserted between the two pressing plates; the spring can cooperate adjusting screw to drive the sand separating plate to do reciprocating linear motion within a certain range, and the consistency of air pressure of each part in the sand box is ensured.
Preferably, the sand separation net comprises a covered edge, a wire mesh and convex columns, the covered edge is of a circular structure, the wire mesh is mounted on the inner wall of the covered edge, the convex columns are arranged at the upper end and the lower end of the covered edge, and the convex columns are mounted on the sand separation plate through screws; after the sand separation net is used for a long time, the sand separation net can be replaced without integrally replacing the sand separation plate, so that the working cost is saved.
Preferably, the bottom end of the inner box body is uniformly provided with feed openings from left to right, the left side wall and the right side wall of each feed opening are both provided with a guide plate through hinges, the lower end of each guide plate is provided with an arc-shaped threaded plate, the lower end of each arc-shaped threaded plate is connected with the upper end of a pressing rod in a threaded manner, and the pressing rod is arranged on the side wall of the outer box body in a threaded connection manner; after will compressing tightly the pole and pull down from outer box, the molding sand alright fall down from the feed opening under the guide effect of stock guide, need not to pour the molding sand out after the case that turns over again, reduced intensity of labour.
Compared with the prior art, the invention has the following advantages:
1. according to the sand box for the lost foam casting process, the vacuumizing position can be changed within a certain range in the vacuumizing process so as to improve the uniformity of tightness of each part of a sand mould, the sand separation plates are connected through the mounting frame, the steps of assembling and disassembling the sand separation plates are reduced, the sand is discharged in a bottom sand discharging mode after forming, and the production input cost and the working strength are reduced;
2. according to the sand separation net, the installation frame and the sand separation plate are connected with the inner box body and the outer box body in a clamping mode, the sand separation plate can be disassembled and assembled without consuming a large amount of time, the sand separation plate is detachably connected with the sand separation net, the sand separation net can be replaced without integrally replacing the sand separation plate after the sand separation net is used for a long time, and the working cost is saved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
FIG. 3 is a schematic structural diagram of the outer box body, the mounting frame, the sand-separating plate and the adjusting screw according to the invention;
FIG. 4 is an enlarged view of the invention taken from the line A of FIG. 2;
FIG. 5 is an enlarged view of the invention taken from the B-direction of FIG. 2;
fig. 6 is a partial enlarged view of the invention from the C-direction of fig. 3.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further explained with reference to fig. 1 to 6.
A sand box for a lost foam casting process comprises an outer box body 1, an inner box body 2 and a ventilation mechanism 3, wherein the inner box body 2 is placed in the outer box body 1, the outer box body 1 is connected with the inner box body 2 through the ventilation mechanism 3, ventilation holes are uniformly formed in the front, back, left and right side walls of the outer box body 1 and the inner box body 2, the positions of the ventilation holes formed in the outer box body 1 and the inner box body 2 are in one-to-one correspondence, the ventilation holes are of a long strip-shaped structure, and two ends of each ventilation hole are of arc-shaped surface; wherein:
the bottom end of the inner box body 2 is uniformly provided with feed openings from left to right, the left side wall and the right side wall of each feed opening are both provided with a guide plate 2a through hinges, the lower end of each guide plate 2a is provided with an arc-shaped threaded plate 2b, the lower end of each arc-shaped threaded plate 2b is connected with the upper end of a pressing rod 2c in a threaded manner, and each pressing rod 2c is arranged on the side wall of the outer box body 1 in a threaded manner; after will compressing tightly pole 2c and pull down from outer box 1, the molding sand alright fall from the feed opening under the guide effect of stock guide 2a, need not to pour the molding sand out after the case turning over, reduced intensity of labour.
The ventilating mechanism 3 comprises a mounting frame 31, a sand separating plate 32, a ventilating frame 33, a transverse connecting square pipe 34, a vertical connecting square pipe 35, a butt joint pipe 36 and an adjusting screw 37, the mounting frame 31 is mounted at the upper end of the outer box body 1 through screws, the sand separating plate 32 is mounted on the front, back, left and right sides of the lower end of the mounting frame 31 in a sliding fit mode, the inner wall of the sand separating plate 32 is connected with the ventilating frame 33, the vertical connecting square pipes 35 are mounted on the front, back, left and right outer walls of the outer box body 1 at equal intervals, the adjacent vertical connecting square pipes 35 are connected through the transverse connecting square pipe 34, the transverse connecting square pipe 34 is mutually communicated with the vertical connecting square pipes 35, a butt joint is formed in the transverse connecting square pipe 34, the butt joint pipe 36 is mounted outside the butt joint, circular through holes 35a are uniformly formed in the inner side of the vertical connecting square pipe 35 from top to bottom, the, the top end of the adjusting screw 37 is tightly attached to the side wall of the sand separating plate 32; after being connected current vacuum pump and butt joint pipe 36, the vacuum pump just can see through sand separating plate 32 and the molding sand of ventilation frame 33 in the internal box 2 and carry out the evacuation operation, make the molding sand closely arrange, mounting bracket 31, sand separating plate 32 and internal box 2, be the joint mode between the external box 1, need not to consume a large amount of time and can carry out the dismouting to sand separating plate 32, can promote through rotating adjusting screw 37 and remove at the certain limit sand separating plate 32 relative mounting bracket 31, and then change ventilation frame 33's position, make the vacuum pump can carry out the evacuation operation to the molding sand of different positions, the homogeneity of evacuation has been guaranteed.
Sealing grooves are formed in the top end of the mounting frame 31, the top end of the outer box body 1 and the top end of the inner box body 2, and rubber sealing strips 31a are arranged in the sealing grooves between the top end of the mounting frame 31 and the top ends of the outer box body 1 and the inner box body 2; the sealing performance of the interior of the sand box can be ensured.
The side wall of the sand separation plate 32 is uniformly provided with sand separation holes, the positions of the sand separation holes correspond to the positions of the vent holes one by one, a sand separation net 321 is arranged in each sand separation hole, the outer side of each sand separation hole is provided with a clamping annular groove, the inner wall of each clamping annular groove is tightly attached to the side wall of the ventilation frame 33, and the inner wall of each clamping annular groove is uniformly provided with a rubber block 32 a; the sand-separating net 321 can prevent the molding sand from entering the air holes formed in the outer box 1, and the blockage is avoided.
Springs 1a are uniformly arranged between the sand separating plate 32 and the outer box body 1 from top to bottom, one end of each spring 1a is arranged on the inner wall of the outer box body 1, the other end of each spring 1a is connected with a pressing plate 1b, the side wall of each pressing plate 1b is tightly attached to the side wall of the sand separating plate 32, and the top end of each pressing plate 1b is of an upward-convex arc surface structure, so that the sand separating plate 32 can be conveniently inserted between the two pressing plates 1 b; the spring 1a can cooperate with the adjusting screw 37 to drive the sand separating plate 32 to perform reciprocating linear motion within a certain range, so as to ensure the consistency of air pressure of each part in the sand box.
The sand-separating net 321 comprises a covered edge 321a, a wire gauze 321b and convex columns 321c, the covered edge 321a is of a circular structure, the wire gauze 321b is installed on the inner wall of the covered edge 321a, the convex columns 321c are arranged at the upper end and the lower end of the covered edge 321a, and the convex columns 321c are installed on the sand-separating plate 32 through screws; after the sand screen 321 is used for a long time, only the sand screen 32 can be replaced without replacing the whole sand screen 32, so that the working cost is saved.
The ventilation frame 33 comprises ventilation pipes 331, baffles 332, connecting rods 333 and mounting rods 334, the ventilation pipes 331 are clamped in the clamping annular groove, the baffles 332 are symmetrically mounted on the left side and the right side of the ventilation pipes 331, the inner walls of the baffles 332 are tightly attached to the inner wall of the inner box body 2 in a sliding fit mode, adjacent ventilation pipes 331 are connected through the connecting rods 333, the mounting rods 334 are mounted on the outer walls of the two ventilation pipes 331 located on the outermost side of the inner box body 2, the mounting rods 334 are fixed on the inner box body 2 through screws, and the mounting rods 334 are of a left-right telescopic structure; after the vent pipe 331 is inserted into the clamping annular groove, under the connecting action of the mounting rod 334 and the connecting rod 333, the vent pipe 331 can move synchronously with the sand separating plate 32, so that the vacuumizing position is changed, the baffle 332 can shield the vent hole in the inner box body 2 to a certain extent in the moving process, and the sealing performance of the inner box body 2 is ensured.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a sand box for lost foam casting process, includes outer box (1), interior box (2) and ventilation mechanism (3), its characterized in that: an inner box body (2) is placed in the outer box body (1), the outer box body (1) is connected with the inner box body (2) through a ventilation mechanism (3), air vents are uniformly formed in the front, back, left and right side walls of the outer box body (1) and the inner box body (2), the positions of the air vents formed in the outer box body (1) and the inner box body (2) are in one-to-one correspondence, the air vents are of long strip-shaped structures, and the two ends of the air vents are of arc-shaped surface structures; wherein:
the ventilating mechanism (3) comprises a mounting frame (31), a sand separating plate (32), a ventilating frame (33), a transverse connecting square tube (34), a vertical connecting square tube (35), a butt joint tube (36) and adjusting screws (37), wherein the mounting frame (31) is mounted at the upper end of the outer box body (1) through screws, the sand separating plate (32) is mounted on the front, back, left and right sides of the lower end of the mounting frame (31) in a sliding fit mode, the inner wall of the sand separating plate (32) is connected with the ventilating frame (33), the vertical connecting square tubes (35) are mounted on the front, back, left and right outer walls of the outer box body (1) at equal intervals, adjacent vertical connecting square tubes (35) are connected through the transverse connecting square tubes (34), the transverse connecting square tubes (34) are communicated with the vertical connecting square tubes (35), the transverse connecting square tubes (34) are provided with butt joint ports, the butt joint tubes (36) are mounted outside the butt joint ports, circular, the circular through holes (35 a) correspond to the positions of the vent holes one by one, adjusting screws (37) are installed on the side wall of the outer box body (1) in a threaded connection mode, and the top ends of the adjusting screws (37) are tightly attached to the side wall of the sand separation plate (32).
2. The sand box for a lost foam casting process according to claim 1, wherein: evenly seted up on sand control board (32) lateral wall and separated the sand hole, separated the sand hole position and air vent position one-to-one, installed in the sand hole and separated sand net (321), separated the sand hole outside and seted up the joint ring channel, joint ring channel inner wall is hugged closely mutually with ventilation frame (33) lateral wall, and evenly is provided with rubber block (32 a) on the joint ring channel inner wall.
3. The sand box for a lost foam casting process according to claim 1, wherein: ventilation frame (33) are including breather pipe (331), baffle (332), connecting rod (333) and installation pole (334), breather pipe (331) joint is in the joint ring channel, baffle (332) are installed to breather pipe (331) left and right sides symmetry, baffle (332) inner wall hugs closely on interior box (2) inner wall through sliding fit mode, be connected through connecting rod (333) between adjacent breather pipe (331), all install installation pole (334) on two breather pipe (331) outer walls that are located box (2) the outside, installation pole (334) pass through the fix with screw on interior box (2), but installation pole (334) are for controlling extending structure.
4. The sand box for a lost foam casting process according to claim 1, wherein: the sealing structure is characterized in that sealing grooves are formed in the top end of the mounting frame (31), the top end of the outer box body (1) and the top end of the inner box body (2), and rubber sealing strips (31 a) are installed in the sealing grooves between the top end of the mounting frame (31) and the top ends of the outer box body (1) and the inner box body (2).
5. The sand box for a lost foam casting process according to claim 4, wherein: separate between sand board (32) and outer box (1) from last down evenly being provided with spring (1 a), spring (1 a) one end is installed on outer box (1) inner wall, and the spring (1 a) other end is connected with pressure strip (1 b), and pressure strip (1 b) lateral wall is hugged closely mutually with separating sand board (32) lateral wall, and pressure strip (1 b) top is the bellied arc surface structure that makes progress, conveniently inserts between two pressure strips (1 b) separating sand board (32).
6. The sand box for a lost foam casting process according to claim 2, wherein: the sand separation net (321) comprises a covered edge (321 a), a wire mesh (321 b) and convex columns (321 c), the covered edge (321 a) is of a circular structure, the wire mesh (321 b) is installed on the inner wall of the covered edge (321 a), the convex columns (321 c) are arranged at the upper end and the lower end of the covered edge (321 a), and the convex columns (321 c) are installed on the sand separation plate (32) through screws.
7. The sand box for a lost foam casting process according to claim 1, wherein: the feed opening has evenly been seted up to turning right from a left side in interior box (2) bottom, and the lateral wall all has stock guide (2 a) through the hinge mounting about the feed opening, and stock guide (2 a) lower extreme is provided with arc thread board (2 b), and arc thread board (2 b) lower extreme is connected with compressing tightly pole (2 c) upper end through the screw thread mode, and compressing tightly pole (2 c) are installed on outer box (1) lateral wall through the threaded connection mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911310814.4A CN110947920B (en) | 2019-12-18 | 2019-12-18 | Sand box for lost foam casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911310814.4A CN110947920B (en) | 2019-12-18 | 2019-12-18 | Sand box for lost foam casting process |
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| Publication Number | Publication Date |
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| CN110947920A CN110947920A (en) | 2020-04-03 |
| CN110947920B true CN110947920B (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911310814.4A Active CN110947920B (en) | 2019-12-18 | 2019-12-18 | Sand box for lost foam casting process |
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| JPH04270028A (en) * | 1991-02-25 | 1992-09-25 | Aisin Takaoka Ltd | Molding flask |
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| CN103736944A (en) * | 2013-12-26 | 2014-04-23 | 柳州正菱集团有限公司 | Negative-pressure evanescent mold sand box pressing plate |
| CN104475691A (en) * | 2014-12-05 | 2015-04-01 | 范继安 | Evaporative pattern casting sand box for small parts in batches |
| CN205904398U (en) * | 2016-06-29 | 2017-01-25 | 重庆市大足区通达铁路车辆配件制造有限公司 | A disappearance sand case for axle housing manufacturing |
| CN206276877U (en) * | 2016-12-20 | 2017-06-27 | 南京诺瑞特铸造有限公司 | A kind of evaporative pattern sandbox |
| CN208960935U (en) * | 2018-07-25 | 2019-06-11 | 台州巨东精密铸造有限公司 | A kind of dispellable mould casting sandbox |
| CN110405145A (en) * | 2019-08-30 | 2019-11-05 | 重庆钢铁(集团)有限责任公司 | Dispellable mould casting slow cooling sandbox |
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2019
- 2019-12-18 CN CN201911310814.4A patent/CN110947920B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8029438U1 (en) * | 1980-11-05 | 1981-03-19 | Passavant-Werke Michelbacher Hütte, 6209 Aarbergen | MOLDING BOX FOR THE VACUUM FORMING PROCESS |
| JPH04270028A (en) * | 1991-02-25 | 1992-09-25 | Aisin Takaoka Ltd | Molding flask |
| CN102581235A (en) * | 2012-03-28 | 2012-07-18 | 湖南省津市市嘉城汽车部件制造有限公司 | Multifunctional sand box for casting |
| CN103736944A (en) * | 2013-12-26 | 2014-04-23 | 柳州正菱集团有限公司 | Negative-pressure evanescent mold sand box pressing plate |
| CN104475691A (en) * | 2014-12-05 | 2015-04-01 | 范继安 | Evaporative pattern casting sand box for small parts in batches |
| CN205904398U (en) * | 2016-06-29 | 2017-01-25 | 重庆市大足区通达铁路车辆配件制造有限公司 | A disappearance sand case for axle housing manufacturing |
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| CN208960935U (en) * | 2018-07-25 | 2019-06-11 | 台州巨东精密铸造有限公司 | A kind of dispellable mould casting sandbox |
| CN110405145A (en) * | 2019-08-30 | 2019-11-05 | 重庆钢铁(集团)有限责任公司 | Dispellable mould casting slow cooling sandbox |
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| CN110947920A (en) | 2020-04-03 |
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Denomination of invention: A sand box for EPC Process Effective date of registration: 20220526 Granted publication date: 20201113 Pledgee: Wuhu Jinfan Financing Guarantee Co.,Ltd. Pledgor: WUHU JIUHONG HEAVY INDUSTRY CO.,LTD. Registration number: Y2022980006355 |
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