CN111687396A - Integrated water-through mold - Google Patents
Integrated water-through mold Download PDFInfo
- Publication number
- CN111687396A CN111687396A CN202010375740.9A CN202010375740A CN111687396A CN 111687396 A CN111687396 A CN 111687396A CN 202010375740 A CN202010375740 A CN 202010375740A CN 111687396 A CN111687396 A CN 111687396A
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- China
- Prior art keywords
- upper die
- die
- lower die
- mold
- cover plate
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims description 32
- 238000003860 storage Methods 0.000 claims description 26
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 22
- 238000005266 casting Methods 0.000 abstract description 15
- 229910000831 Steel Inorganic materials 0.000 abstract description 12
- 239000004576 sand Substances 0.000 abstract description 12
- 239000010959 steel Substances 0.000 abstract description 12
- 229910052742 iron Inorganic materials 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a casting mold, in particular to an integrated water-through mold, which comprises: an upper die; an upper die cover plate integrally formed with the upper die; a lower die; a lower die cover plate integrally formed with the lower die; the upper die is a fixed die, and the lower die is a movable die and is driven by a first driving element to realize opening and closing with the upper die; compared with the traditional manual mold, the water supply function is added, molten steel filled in a cavity is quickly cooled, molded and demolded within 3-7 minutes, the mold effect is more than 5 times that of the traditional mold and the iron mold sand-coated mold, the chilling process is particularly suitable for steel balls, the crystalline structure of the steel balls can be finer, the quality of the steel balls is improved, and compared with the traditional detachable connection type structure, the integrated molding structure is simpler in appearance, more practical and more reliable.
Description
Technical Field
The invention relates to a casting mold, in particular to an integrated water-through mold.
Background
The die (mUj) is a tool for making a blank into a finished piece with a specific shape and size under the action of external force, and various dies and tools for obtaining required products by injection molding, blow molding, extrusion, die casting or forging forming, smelting, stamping and the like in industrial production.
In short, a mold is a tool used to make a shaped article, the tool being made up of various parts, different molds being made up of different parts. The processing of the appearance of an article is realized mainly through the change of the physical state of a formed material. The element has the name of "industrial mother".
The die has a specific contour or cavity shape, and the blank can be separated (blanked) according to the contour shape by applying the contour shape with the cutting edge. The blank can obtain a corresponding three-dimensional shape by using the shape of the inner cavity. The mold generally comprises a movable mold and a fixed mold (or a male mold and a female mold), which can be separated or combined. The part is taken out when the part is separated, the blank is injected into a die cavity for forming when the part is folded, the die is a precise tool, the shape is complex, the expansion force of the blank is borne, the structural strength, the rigidity, the surface hardness, the surface roughness and the processing precision are all higher requirements, and the development level of die production is one of important marks of the mechanical manufacturing level.
The traditional casting mould needs a manual mould and an iron mould to be coated with a sand mould when in use, the cooling time of the mould is longer than that of the mould which needs 25-35 minutes for forming and demoulding; the usage amount of traditional mold precoated sand is large, so that huge waste is caused; the manual die has a short service life due to the high temperature.
Disclosure of Invention
In order to overcome the shortcoming of original casting mould, this application provides a water mould is led to integral type, includes:
the upper die is internally provided with a first liquid storage tank at a position close to the top, an upper die water inlet and an upper die water outlet which transversely penetrate through the outer side wall of the upper die and are communicated with the external environment are arranged at a position where the bottom of the first liquid storage tank is connected with the inner side wall, and an upper die cavity is arranged at the bottom of the upper die at the position of a penetrated pouring gate;
the upper die cover plate is integrally formed with the upper die, the size of the upper die cover plate is larger than that of the upper die, an exposed extending part is arranged on the periphery of the upper die cover plate, a second mounting hole matched with the frame for mounting is formed in the extending part, a through hole for exposing the pouring gate is reserved in the upper die cover plate, the upper die cover plate is provided with the pouring gate which penetrates through the top and the bottom of the upper die and is communicated with an upper die cavity, and the upper die cover plate is also provided with an air vent for communicating the outside with the first liquid storage tank on the periphery of the pouring gate;
the top of the lower die is provided with a lower die cavity corresponding to the upper die cavity of the upper die, a positioning hole is formed in the center of the position corresponding to the pouring gate of the upper die, a second liquid storage tank is arranged at the position, close to the bottom, of the lower die, and a lower die water inlet and a lower die water outlet which transversely penetrate through the outer side wall of the lower die and are communicated with the external environment are formed in the position, connected with the inner side wall, of the bottom of the second liquid storage tank;
the lower die cover plate is integrally formed with the lower die, and the edge of the lower die cover plate is flush with the edge of the lower die;
the upper die is a fixed die, the lower die is a movable die and is driven by a first driving element to realize the opening and closing with the upper die, and the opening and closing are preferred: the lower die and the upper die can be driven by a second driving element to realize overturning after being separated.
Preferably, the following steps: the position of the pouring gate is located in the center of the upper mold.
Preferably, the following steps: the first reservoir is shaped as an annular water channel surrounding the pouring opening.
Preferably, the following steps: the upper die water inlet and the upper die water outlet, and the lower die water inlet and the lower die water outlet are positioned on the same straight line.
Preferably, the following steps: the bottom of the first liquid storage tank and the bottom of the second liquid storage tank are obliquely arranged, and one end close to the water inlet is higher than one end close to the water outlet.
Preferably, the following steps: and the upper die and the lower die are symmetrically provided with a limiting column and a limiting groove which are mutually assembled and then prevent rotation.
Preferably, the following steps: the integrated water passing mold further comprises a pouring cup used for penetrating through the upper mold and the lower mold, wherein a liquid injection port is formed in the top of the pouring cup, a liquid outlet hole is formed in the bottom of the pouring cup, and a positioning block matched with the positioning hole is formed in the bottom of the pouring cup.
Has the advantages that:
the invention provides an integrated water-through mould, compared with the traditional manual mould and the iron mould precoated sand mould, the cooling time is longer than the time of forming and demoulding in 25-35 minutes, the water-through function of the mould is increased, molten steel filled in a cavity is rapidly cooled, formed and demoulded within 3-7 minutes, the mould effect is more than 5 times of that of the traditional mould and the iron mould precoated sand mould, the chilling process is particularly suitable for steel casting balls, the crystalline structure of the steel casting balls can be finer, and the quality of the steel balls is improved. The mould is also suitable for casting balls made of various alloy materials, and the sand-coated iron mould is only suitable for casting balls with the hardness of products needing to be improved by quenching. The pouring cup of the mold is pre-molded by adopting a hot core box, the sprue and the riser are integrated, the riser is not separately arranged aiming at the process of casting the ball by using the water-through mold, the utilization rate of molten iron is maximized, direct manual installation is realized during production, the operation is simple and rapid, the labor intensity of operators is reduced, and the usage amount of precoated sand is greatly reduced. This mould adopts water-cooling technology to improve mould life greatly, surpasss than original manual mould life and improves more than the one time, and this integral type forming structure is for traditional connection formula structure of dismantling, and the appearance is simpler, and is more practical reliable.
Drawings
FIG. 1 is a schematic structural view of an integrated water-through mold;
FIG. 2 is an exploded view of the integrated water-through mold structure;
FIG. 3 is a side view of the upper mold;
FIG. 4 is a bottom view of the upper mold;
FIG. 5 is a schematic view of a second reservoir inside the lower mold;
fig. 6 is a side view of the lower mold.
The reference numbers are as follows:
1, an upper die, 1-1 a first liquid storage tank, 1-2 an upper die water inlet, 1-3 an upper die water outlet and 1-4 an upper die cavity;
2, an upper die cover plate, 2-1 extending parts, 2-2 mounting holes, 2-3 pouring gates and 2-4 through holes;
3, a lower die, 3-1, a lower die cavity, 3-2 positioning holes, 3-3 second liquid storage tanks, 3-4 lower die water inlets and 3-5 lower die water outlets;
4, a lower die cover plate;
5, a limiting column and 6 a limiting groove;
7 pouring cup
Detailed Description
The invention is further illustrated with reference to the accompanying figures 1 to 6:
the structure and the principle of the integrated water passing mold of the invention are explained in detail through figures 1-6;
the invention relates to an integrated water-through mold, which structurally comprises:
the upper die comprises an upper die 1, wherein a first liquid storage tank 1-1 is arranged in the position, close to the top, of the upper die 1, an upper die water inlet 1-2 and an upper die water outlet 1-3 which transversely penetrate through the outer side wall of the upper die and are communicated with the external environment are arranged at the position, connected with the inner side wall, of the bottom of the first liquid storage tank, the fluidity of the upper die is enhanced when the upper die is arranged at the connection position, and an upper die cavity 1-4 is arranged at the position, communicated with a pouring gate, of the bottom of the upper die 1;
the upper die cover plate 2 is integrally formed with the upper die, the size of the upper die cover plate 2 is larger than that of the upper die 1, an exposed extension part 2-1 is arranged on the periphery of the upper die cover plate 2, a mounting hole 2-2 matched with the frame for mounting is formed in the extension part 2-1, a sprue gate 2-3 penetrating through an upper die cavity at the top and the bottom of the upper die is arranged on the upper die cover plate 2, an air vent 2-4 used for communicating the outside with the cavity is further formed in the periphery of the sprue gate of the upper die cover plate 2, and the air vent 2-4 is used for facilitating hot air to flow out and ensuring that hot melt liquid such as molten iron is consistent with the outside air pressure when hot melt liquid is poured into the cavity in the
The device comprises a lower die 3, wherein a lower die cavity 3-1 is arranged at the top of the lower die 3 corresponding to an upper die cavity 1-4 of an upper die 1, a positioning hole 3-2 is arranged at the center of the position corresponding to a pouring gate of the upper die, a second liquid storage tank 3-3 is arranged in the position of the lower die 3 close to the bottom, and a lower die water inlet 3-4 and a lower die water outlet 3-5 which transversely penetrate through the outer side wall of the lower die and are communicated with the external environment are arranged at the position where the bottom of the second liquid storage tank is connected with the inner side wall;
the lower die cover plate 4 is integrally formed with the lower die, and the edge of the lower die cover plate 4 is flush with the edge of the lower die;
go up mould 1 and last mould apron 2, bed die 3 and 4 integral type shaping of bed die apron and make, specifically form through the psammitolite casting, fill in the psammitolite with inside first reservoir, second reservoir and delivery port, water inlet, after the shaping, utilize sand blower from water inlet or delivery port with inside psammitolite blow off can, this integral type shaping structure can dismantle the connection mode structure for traditional, the appearance is simpler, more practical reliable, it is the cover half to go up mould 1, bed die 3 is the movable mould and is realized opening and shutting with last mould 1 by the drive of first drive element, first drive element can select gas, jar hydro-cylinder etc. that have the flexible function according to the circumstances, plays the main effect and lies in compound die and die sinking between drive bed die (movable mould) and the last mould (cover half).
Preferably, the following steps: the lower die 3 can be driven by a second driving element to realize overturning after being separated from the upper die 1, and specifically, the second driving element can drive the lower die 3 to overturn for a rack and a gear or drive one side of a movable die to realize overturning by a telescopic cylinder and an oil cylinder.
Preferably, the following steps: the pouring gate 2-3 is positioned in the center of the upper die 1 and is arranged in the center to facilitate the uniform molding of the poured liquid in the die cavity.
Preferably, the following steps: the first liquid storage tank 1-1 is in the shape of an annular water tank surrounding the pouring gate 2-3, and in order to ensure that the original pouring gate is not influenced and the water storage tank has a water storage function, the water storage tank is designed to be in an annular shape.
Preferably, the following steps: the upper die water inlet 1-2, the upper die water outlet 1-3, the lower die water inlet 3-4 and the lower die water outlet 3-5 are positioned on the same straight line in the same direction, and the design has the advantage that the circulating liquid flows from the water inlet to the water outlet most directly, particularly for the first water storage tank with an annular structure, the water flow entering the water inlet can be divided into two channels, and therefore the lengths of the water channels on the two sides can be the same.
Preferably, the following steps: the bottom parts of the first liquid storage tank 1-1 and the second liquid storage tank 3-3 are obliquely arranged, one end close to the water inlet is higher than one end close to the water outlet, and the design has the advantages of adding the flowing speed and realizing a better circulating cooling effect.
Preferably, the following steps: and the upper die 1 and the lower die 3 are symmetrically provided with a limiting column 5 and a limiting groove 6 which are mutually assembled and then prevent rotation.
Preferably, the following steps: the integrated water passing mold further comprises a pouring cup 7 which is used for penetrating through the upper mold and the lower mold in a matched mode, wherein a liquid injection port is formed in the top of the pouring cup 7, a liquid outlet hole is formed in the bottom of the pouring cup 7, and a positioning block which is matched with the positioning hole 3-2 is arranged at the bottom of the pouring cup.
The water supply working mode of the die is as follows:
the mould water is provided with a set of independent water circulation system, the production line is provided with a water tank, a water pump, a cooling tower (or a cold-heat exchanger), a main water inlet pipe and a main water outlet pipe, the main water pipe is provided with a plurality of connectors with valves, and the water inlet and outlet of the upper mould and the lower mould are respectively corresponding to the connectors. The water circulation is equipped with an intelligent temperature control system, so that the die is ensured to be in a certain temperature range.
The invention provides an integrated water-through mould, compared with the traditional manual mould and the iron mould precoated sand mould, the cooling time is longer than the time of forming and demoulding in 25-35 minutes, the water-through function of the mould is increased, molten steel filled in a cavity is rapidly cooled, formed and demoulded within 3-7 minutes, the mould effect is more than 5 times of that of the traditional mould and the iron mould precoated sand mould, the chilling process is particularly suitable for steel casting balls, the crystalline structure of the steel casting balls can be finer, and the quality of the steel balls is improved. The mould is also suitable for casting balls made of various alloy materials, and the sand-coated iron mould is only suitable for casting balls with the hardness of products needing to be improved by quenching. The pouring cup of the mold is pre-molded by adopting a hot core box, the sprue and the riser are integrated, the riser is not separately arranged aiming at the process of casting the ball by using the water-through mold, the utilization rate of molten iron is maximized, direct manual installation is realized during production, the operation is simple and rapid, the labor intensity of operators is reduced, and the usage amount of precoated sand is greatly reduced. This mould adopts water-cooling technology to improve mould life greatly, surpasss than original manual mould life and improves more than the one time, and this integral type forming structure is for traditional connection formula structure of dismantling, and the appearance is simpler, and is more practical reliable.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (8)
1. An integral type mould that leads to water, its characterized in that includes:
the upper die is internally provided with a first liquid storage tank at a position close to the top, an upper die water inlet and an upper die water outlet which transversely penetrate through the outer side wall of the upper die and are communicated with the external environment are arranged at a position where the bottom of the first liquid storage tank is connected with the inner side wall, and an upper die cavity is arranged at the bottom of the upper die at the position of a penetrated pouring gate;
the upper die cover plate is integrally molded with the upper die, the upper die cover plate is larger than the upper die in size, an exposed extending part is arranged around the upper die cover plate, a second mounting hole matched with the frame for mounting is formed in the extending part, a through hole for exposing the pouring gate is reserved in the upper die cover plate, the upper die cover plate is provided with the pouring gate which penetrates through the top and the bottom of the upper die and is communicated with an upper die cavity, and the upper die cover plate is also provided with an air vent for communicating the outside with the upper die cavity around the pouring gate;
the top of the lower die is corresponding to the lower die cavity in the position of the upper die cavity of the upper die, a positioning hole is formed in the center of the position corresponding to the pouring gate of the upper die, a second liquid storage tank is arranged at the position, close to the bottom, of the lower die, and a lower die water inlet and a lower die water outlet which transversely penetrate through the outer side wall of the lower die and are communicated with the external environment are formed in the position, connected with the inner side wall, of the bottom of the second liquid storage tank;
the lower die cover plate is integrally formed with the lower die, and the edge of the lower die cover plate is flush with the edge of the lower die;
the upper die is a fixed die, and the lower die is a movable die and is driven by a first driving element to open and close with the upper die.
2. The integrated water passing mold according to claim 1, wherein: the lower die and the upper die can be driven by a second driving element to realize overturning after being separated.
3. The integrated water passing mold according to claim 1, wherein: the position of the pouring gate is located in the center of the upper mold.
4. The integrated water passing mold according to claim 1, wherein: the first reservoir is shaped as an annular water channel surrounding the pouring opening.
5. The integrated water passing mold according to claim 1, wherein: the upper die water inlet and the upper die water outlet, and the lower die water inlet and the lower die water outlet are positioned on the same straight line.
6. The integrated water passing mold according to claim 1, wherein: the bottom of the first liquid storage tank and the bottom of the second liquid storage tank are obliquely arranged, and one end close to the water inlet is higher than one end close to the water outlet.
7. The integrated water passing mold according to claim 1, wherein: and the upper die and the lower die are symmetrically provided with a limiting column and a limiting groove which are mutually assembled and then prevent rotation.
8. The integrated water passing mold according to claim 1, wherein: the integrated water passing mold further comprises a pouring cup used for penetrating through the upper mold and the lower mold, wherein a liquid injection port is formed in the top of the pouring cup, a liquid outlet hole is formed in the bottom of the pouring cup, and a positioning block matched with the positioning hole is formed in the bottom of the pouring cup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010375740.9A CN111687396A (en) | 2020-05-07 | 2020-05-07 | Integrated water-through mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010375740.9A CN111687396A (en) | 2020-05-07 | 2020-05-07 | Integrated water-through mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111687396A true CN111687396A (en) | 2020-09-22 |
Family
ID=72476499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010375740.9A Pending CN111687396A (en) | 2020-05-07 | 2020-05-07 | Integrated water-through mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111687396A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113414349A (en) * | 2021-06-22 | 2021-09-21 | 嵊州市福星机械制造有限公司 | Sand mold production structure and casting production process applying same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0178296A2 (en) * | 1984-10-12 | 1986-04-16 | N. Milos Prof. Dr. Tomovic | Permanent mould with insert for casting mill balls and other crushing elements |
| CN105562663A (en) * | 2016-01-29 | 2016-05-11 | 安徽省凤形耐磨材料股份有限公司 | Cooling device used for cast grinding ball |
| CN106890950A (en) * | 2017-02-28 | 2017-06-27 | 马鞍山龙晟耐磨材料有限公司 | A kind of simple steel ball casting mold combination and pouring technology |
| CN208303836U (en) * | 2018-05-16 | 2019-01-01 | 荆州同盈合金材料有限公司 | A kind of aluminum alloy die-casting die |
| CN110076327A (en) * | 2019-05-29 | 2019-08-02 | 承德荣茂铸钢有限公司 | A kind of shellfish abrading-ball molding die difficult to understand with cooling system |
| CN210412486U (en) * | 2019-05-29 | 2020-04-28 | 承德荣茂铸钢有限公司 | Obezo grinding ball forming die with cooling system |
-
2020
- 2020-05-07 CN CN202010375740.9A patent/CN111687396A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0178296A2 (en) * | 1984-10-12 | 1986-04-16 | N. Milos Prof. Dr. Tomovic | Permanent mould with insert for casting mill balls and other crushing elements |
| CN105562663A (en) * | 2016-01-29 | 2016-05-11 | 安徽省凤形耐磨材料股份有限公司 | Cooling device used for cast grinding ball |
| CN106890950A (en) * | 2017-02-28 | 2017-06-27 | 马鞍山龙晟耐磨材料有限公司 | A kind of simple steel ball casting mold combination and pouring technology |
| CN208303836U (en) * | 2018-05-16 | 2019-01-01 | 荆州同盈合金材料有限公司 | A kind of aluminum alloy die-casting die |
| CN110076327A (en) * | 2019-05-29 | 2019-08-02 | 承德荣茂铸钢有限公司 | A kind of shellfish abrading-ball molding die difficult to understand with cooling system |
| CN210412486U (en) * | 2019-05-29 | 2020-04-28 | 承德荣茂铸钢有限公司 | Obezo grinding ball forming die with cooling system |
Non-Patent Citations (1)
| Title |
|---|
| 周平安: "《水泥工业耐磨材料与技术手册》", 31 August 2007, 中国建材工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113414349A (en) * | 2021-06-22 | 2021-09-21 | 嵊州市福星机械制造有限公司 | Sand mold production structure and casting production process applying same |
| CN113414349B (en) * | 2021-06-22 | 2022-05-31 | 嵊州市福星机械制造有限公司 | Sand mold production structure and casting production process applying same |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200922 |