CN114147188A - Manufacturing process of tubular thick and long sand core - Google Patents
Manufacturing process of tubular thick and long sand core Download PDFInfo
- Publication number
- CN114147188A CN114147188A CN202110375377.5A CN202110375377A CN114147188A CN 114147188 A CN114147188 A CN 114147188A CN 202110375377 A CN202110375377 A CN 202110375377A CN 114147188 A CN114147188 A CN 114147188A
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- China
- Prior art keywords
- sand
- manufacturing process
- core
- mould
- tubular
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000005498 polishing Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/106—Vented or reinforced cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the technical field of casting, and discloses a manufacturing process of a tubular thick and long sand core, which comprises the following steps of customizing a mould with corresponding size specifications according to the shape of the sand core to be prepared, polishing and cleaning the mould, then mixing sand, customizing a tubular hollow iron core, fixing the mould on equipment, fixing the tubular hollow iron core by matching with a positioning hole, preheating the mould by a heating device, injecting sand into the mould through a sand injection port, enabling coated sand to wrap the whole tubular hollow iron core, finally sintering and molding, demolding and performing parting line burr treatment on a finished sand core.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a manufacturing process of a tubular thick and long sand core.
Background
With the development and progress of science and technology, the requirements of people for things are changed from old thinking that people can use things as things to be quite fine and smooth, and only with the continuous progress or innovation conception, a new form is generated to improve the added value of the product, so that people can live under the test of intense market competition. The sand core is one of the cores, and is formed by processing sand in a mold, so that the sand core has a certain shape and structure. When the sand core is used, the internal shape of a product can be conveniently determined by filling the sand core, a core box (a wood mold, a metal mold and the like) is required for manufacturing the traditional sand core, and therefore the core box which is matched with the shape of the sand core needs to be prepared before the sand core is manufactured.
Disclosure of Invention
In view of the problems raised by the above background art, the present invention is directed to: aims to provide a manufacturing process of a tubular thick and long sand core.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a manufacturing process of a tubular thick and long sand core comprises the following steps:
s1, customizing a mould with corresponding dimension specification according to the shape of the sand core to be prepared, wherein the mould comprises a positioning hole, a heating device and a runner, and a sand shooting port is formed after the mould is closed and is communicated with the runner;
s2, polishing the die to make the surface of the die smooth;
s3, mixing sand, namely adopting precoated sand with the granularity of 50-100 meshes as a raw material, adding a curing agent and resin, and mixing, wherein the adding amount of the curing agent is 15% -45% of the amount of the precoated sand, and the adding amount of the resin is 1% -1.5% of the amount of the precoated sand;
s4, customizing a tubular hollow iron core, wherein air holes are formed in the tubular hollow iron core, the diameter size of each air hole is 0.8-1.2 mm, and the edges of the air holes are polished;
s5, fixing the die on equipment, placing the tubular hollow iron core into the die, and matching the positioning hole to position and limit the tubular hollow iron core;
s6, heating the mould to 270-350 ℃ through a heating device, and spraying a layer of release agent on the surface of the inner cavity of the mould by using a spray gun after heating to a proper temperature;
s7, shooting sand into the die through a sand shooting port, wherein the sand shooting pressure is 0.5-0.75 Mpa, the precoated sand is matched with a runner to wrap the whole tubular hollow iron core, and the wall thickness of the precoated sand is 4-6 mm;
and S8, keeping the temperature of the mold constant at 270-350 ℃ for 60-90 seconds, sintering, forming, demolding, and polishing parting line burrs of the finished sand core.
Further, in step S1, the positioning holes contain a high temperature resistant magnet or a magnetic substance, and the fixing effect is enhanced by magnetism.
Further limiting, in the step S2, the mold is first ground by the wire wheel and then further polished by the polishing agent, so that the polishing is easier and the polishing degree is better.
Further, in the step S3, the mixing time is not less than 5 minutes, which ensures uniform mixing.
Further limiting, in the step S4, the coaxiality of the tubular hollow iron core is less than or equal to 0.05mm, and by adopting the design, the quality of a finished product is ensured, and the wall thickness of the precoated sand is uniform.
Further limiting, in the step S6, after the release agent is sprayed, the mold is closed after standing for 5 to 10 seconds, and the use effect of the release agent is ensured by such a design.
Further, in the step S8, a small file is used for grinding, which is convenient and fast.
The invention has the following beneficial effects:
the invention forms the reinforcing rib in the sand core, increases the strength of the sand core, prevents fracture and deformation, reduces the sand using amount of the tubular hollow core, simultaneously, the air hole of the tubular hollow core enables the smoke generated in the using process of the sand core to enter the tubular hollow core from the air hole and then to be discharged out of the die cavity through the tubular hollow core, thereby ensuring the quality of a casting produced by using the sand core, and the dead weight of the sand core is reduced due to the use of the tubular hollow core.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic block diagram of the process of an embodiment of the process for manufacturing a tubular coarse and long sand core of the present invention.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
As shown in figure 1, the manufacturing process of the tubular thick and long sand core comprises the following steps:
s1, customizing a mould with corresponding dimension specification according to the shape of the sand core to be prepared, wherein the mould comprises a positioning hole, a heating device and a runner, and forming a sand shooting port after the mould is closed, wherein the sand shooting port is communicated with the runner;
s2, polishing the die to make the surface of the die smooth;
s3, mixing sand, namely adopting precoated sand with the granularity of 50-100 meshes as a raw material, adding a curing agent and resin, and mixing, wherein the adding amount of the curing agent is 15% -45% of the amount of the precoated sand, and the adding amount of the resin is 1% -1.5% of the amount of the precoated sand;
s4, customizing a tubular hollow iron core, wherein the tubular hollow iron core is provided with an air hole, the diameter size of the air hole is 0.8-1.2 mm, and the edge of the air hole is polished;
s5, fixing the die on equipment, placing the tubular hollow iron core into the die, and matching the positioning hole to position and limit the tubular hollow iron core;
s6, heating the mould to 270-350 ℃ through a heating device, and spraying a layer of release agent on the surface of the inner cavity of the mould by using a spray gun after heating to a proper temperature;
s7, shooting sand into the die through a sand shooting port, wherein the sand shooting pressure is 0.5-0.75 Mpa, the precoated sand is matched with a runner to wrap the whole tubular hollow iron core, and the wall thickness of the precoated sand is 4-6 mm;
and S8, keeping the temperature of the mold constant at 270-350 ℃ for 60-90 seconds, sintering, forming, demolding, and polishing parting line burrs of the finished sand core.
In the embodiment, when a tubular thick-long sand core manufacturing process is used, a mould with corresponding size specifications is customized according to the shape of the sand core to be prepared, the mould is polished to facilitate subsequent demoulding, sand mixing is started, precoated sand is used as a raw material, a proper amount of curing agent and resin are added for mixing, then a tubular hollow iron core is customized, air outlet holes are uniformly formed in the tubular hollow iron core, burrs at the edges of the air outlet holes formed by punching are removed, the mould is fixed on equipment, the tubular hollow iron core is inserted into the mould through a sand injection port, the tubular hollow iron core is placed by matching with a positioning hole, preheating is carried out, a release agent is sprayed, subsequent demoulding is also facilitated, sand injection is started into the mould, the precoated sand is wrapped on the tubular hollow iron core, sintering and integral molding is carried out, the sand core is subjected to parting line trimming after demoulding to obtain a finished sand core, the inside strengthening rib that has formed of the finished product psammitolite that obtains, the intensity of psammitolite has been increased, prevent fracture and deformation, and for preventing that the psammitolite is thick, the center sintering is not thorough, can lead to a large amount of gas emissions in the casting process, and then influence the foundry goods quality, so the gas pocket of seting up on the tubular hollow core can effectively get into the tubular hollow core with the flue gas volume that the psammitolite produced from the gas pocket, the rethread tubular hollow core discharges the mould die cavity, reach the purpose of guaranteeing the foundry goods quality, and the dead weight of psammitolite has also been indirectly reduced in seting up of gas pocket moreover.
In step S1, the positioning holes preferably contain a high-temperature-resistant magnet or a magnetic substance, and the fixing effect is preferably enhanced by magnetism, and in fact, the fixing effect is enhanced.
Preferably, in step S2, the mold is first ground by a steel wire wheel and then further polished by a polishing agent, so that the polishing is easier and the degree of polishing is better.
In step S3, the mixing time is preferably not less than 5 minutes, so as to ensure uniform mixing, and in fact, the mixing time can be considered according to specific situations.
Preferably, in the step S4, the coaxiality of the tubular hollow core is less than or equal to 0.05mm, and by adopting such a design, the quality of the finished product is ensured, the thickness and the size of the coated sand wall are uniform, and actually, the coaxiality can be considered according to specific conditions.
Preferably, in the step S6, after the release agent is sprayed, the mold is closed after standing for 5 to 10 seconds, so as to ensure the use effect of the release agent, and in fact, the standing time can be considered according to specific conditions.
Preferably, in the step S8, a small file is used for grinding, which is convenient and fast, and in fact, the grinding mode can be considered according to specific situations.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The manufacturing process of the tubular thick and long sand core is characterized by comprising the following steps of:
s1, customizing a mould with corresponding dimension specification according to the shape of the sand core to be prepared, wherein the mould comprises a positioning hole, a heating device and a runner, and a sand shooting port is formed after the mould is closed and is communicated with the runner;
s2, polishing the die to make the surface of the die smooth;
s3, mixing sand, namely adopting precoated sand with the granularity of 50-100 meshes as a raw material, adding a curing agent and resin, and mixing, wherein the adding amount of the curing agent is 15% -45% of the amount of the precoated sand, and the adding amount of the resin is 1% -1.5% of the amount of the precoated sand;
s4, customizing a tubular hollow iron core, wherein air holes are formed in the tubular hollow iron core, the diameter size of each air hole is 0.8-1.2 mm, and the edges of the air holes are polished;
s5, fixing the die on equipment, placing the tubular hollow iron core into the die, and matching the positioning hole to position and limit the tubular hollow iron core;
s6, heating the mould to 270-350 ℃ through a heating device, and spraying a layer of release agent on the surface of the inner cavity of the mould by using a spray gun after heating to a proper temperature;
s7, shooting sand into the die through a sand shooting port, wherein the sand shooting pressure is 0.5-0.75 Mpa, the precoated sand is matched with a runner to wrap the whole tubular hollow iron core, and the wall thickness of the precoated sand is 4-6 mm;
and S8, keeping the temperature of the mold constant at 270-350 ℃ for 60-90 seconds, sintering, forming, demolding, and polishing parting line burrs of the finished sand core.
2. The manufacturing process of the tubular thick and long sand core according to claim 1, wherein the manufacturing process comprises the following steps: in step S1, the positioning hole contains a high temperature resistant magnet or a magnetic substance.
3. The manufacturing process of the tubular thick and long sand core according to claim 2, wherein the manufacturing process comprises the following steps: in step S2, the mold is polished by a wire wheel and then polished by a polishing agent.
4. The manufacturing process of the tubular thick and long sand core according to claim 3, wherein the manufacturing process comprises the following steps: in the above step S3, the mixing time is not less than 5 minutes.
5. The process for manufacturing the tubular thick and long sand core according to claim 4, wherein the process comprises the following steps: in the step S4, the coaxiality of the tubular hollow core is less than or equal to 0.05 mm.
6. The manufacturing process of the tubular thick and long sand core according to claim 5, wherein the manufacturing process comprises the following steps: in the step S6, after the release agent is sprayed, the mold is closed after the mold is left for 5 to 10 seconds.
7. The manufacturing process of the tubular thick and long sand core according to claim 6, wherein the manufacturing process comprises the following steps: in step S8, a small file is used for grinding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375377.5A CN114147188A (en) | 2021-04-08 | 2021-04-08 | Manufacturing process of tubular thick and long sand core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375377.5A CN114147188A (en) | 2021-04-08 | 2021-04-08 | Manufacturing process of tubular thick and long sand core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114147188A true CN114147188A (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110375377.5A Pending CN114147188A (en) | 2021-04-08 | 2021-04-08 | Manufacturing process of tubular thick and long sand core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114147188A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603085A (en) * | 2022-03-30 | 2022-06-10 | 莱芜市万金机械有限公司 | Aluminum-magnesium alloy supporting cylinder sand core of high-voltage switch and manufacturing process thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB700777A (en) * | 1951-04-05 | 1953-12-09 | Grahamston Iron Company Ltd | Improvements relating to core bars for use in moulding metal pipes |
| JP2012192418A (en) * | 2011-03-15 | 2012-10-11 | Hara Kogyosho:Kk | Casting method using rod-like sand core and deformation preventing tool of rod-like sand core |
| CN103752767A (en) * | 2013-12-18 | 2014-04-30 | 桐乡合德机械有限公司 | Shaping structure and manufacturing process of casting elongated hole sand core |
| CN205630308U (en) * | 2016-05-24 | 2016-10-12 | 吴德恩 | Dish pearl burnishing machine and connecting device of motor and polishing dish thereof |
| CN106825385A (en) * | 2017-01-03 | 2017-06-13 | 宁波铭汇金属科技有限公司 | A kind of thermosetting resin sand mould preparation technology |
| CN108262449A (en) * | 2018-03-06 | 2018-07-10 | 溧阳市联华机械制造有限公司 | A kind of method that hot box makes forming graphite chill |
| CN108543917A (en) * | 2018-05-14 | 2018-09-18 | 南阳飞龙汽车零部件有限公司 | A method of solving heat resisting steel product cavity defect |
| CN109108229A (en) * | 2018-10-18 | 2019-01-01 | 四川省犍为恒益铝业有限公司 | A kind of sand core manufacturing process of improved vehicle cabinet and structure |
-
2021
- 2021-04-08 CN CN202110375377.5A patent/CN114147188A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB700777A (en) * | 1951-04-05 | 1953-12-09 | Grahamston Iron Company Ltd | Improvements relating to core bars for use in moulding metal pipes |
| JP2012192418A (en) * | 2011-03-15 | 2012-10-11 | Hara Kogyosho:Kk | Casting method using rod-like sand core and deformation preventing tool of rod-like sand core |
| CN103752767A (en) * | 2013-12-18 | 2014-04-30 | 桐乡合德机械有限公司 | Shaping structure and manufacturing process of casting elongated hole sand core |
| CN205630308U (en) * | 2016-05-24 | 2016-10-12 | 吴德恩 | Dish pearl burnishing machine and connecting device of motor and polishing dish thereof |
| CN106825385A (en) * | 2017-01-03 | 2017-06-13 | 宁波铭汇金属科技有限公司 | A kind of thermosetting resin sand mould preparation technology |
| CN108262449A (en) * | 2018-03-06 | 2018-07-10 | 溧阳市联华机械制造有限公司 | A kind of method that hot box makes forming graphite chill |
| CN108543917A (en) * | 2018-05-14 | 2018-09-18 | 南阳飞龙汽车零部件有限公司 | A method of solving heat resisting steel product cavity defect |
| CN109108229A (en) * | 2018-10-18 | 2019-01-01 | 四川省犍为恒益铝业有限公司 | A kind of sand core manufacturing process of improved vehicle cabinet and structure |
Non-Patent Citations (1)
| Title |
|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603085A (en) * | 2022-03-30 | 2022-06-10 | 莱芜市万金机械有限公司 | Aluminum-magnesium alloy supporting cylinder sand core of high-voltage switch and manufacturing process thereof |
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