CN113369440A - Full mold casting production process by matching loose sand and resin sand - Google Patents
Full mold casting production process by matching loose sand and resin sand Download PDFInfo
- Publication number
- CN113369440A CN113369440A CN202110624983.6A CN202110624983A CN113369440A CN 113369440 A CN113369440 A CN 113369440A CN 202110624983 A CN202110624983 A CN 202110624983A CN 113369440 A CN113369440 A CN 113369440A
- Authority
- CN
- China
- Prior art keywords
- sand
- drying
- loose
- production process
- core
- Prior art date
- 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
- 239000004576 sand Substances 0.000 title claims abstract description 92
- 239000011347 resin Substances 0.000 title claims abstract description 28
- 229920005989 resin Polymers 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000010115 full-mold casting Methods 0.000 title claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 39
- 244000035744 Hura crepitans Species 0.000 claims abstract description 32
- 235000002245 Penicillium camembertii Nutrition 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 241000221696 Sclerotinia sclerotiorum Species 0.000 claims abstract description 15
- 238000003618 dip coating Methods 0.000 claims abstract description 12
- 239000002985 plastic film Substances 0.000 claims abstract description 12
- 229920006255 plastic film Polymers 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 86
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 30
- 238000005406 washing Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000010114 lost-foam casting Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/10—Compacting by jarring devices only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Abstract
The invention relates to a full mold casting production process by matching loose sand and resin sand, which mainly comprises the following steps: s1, placing the formed white mold in a drying room for drying, wherein the drying temperature is controlled to be 40-50 ℃, and the drying time is controlled to be 10-12 hours; s2: dip-coating the dried white mold and the pouring system with a dip-coating mode for two times, and then drying in a drying room, wherein the drying temperature is controlled to be 50-60 ℃, and the drying time is controlled to be 10-12 hours; s3: filling the included angle of the white mould and the part of the loose sand which is not easy to fill with self-hardening resin sand or manufacturing a core, placing the core at the reserved position of the white mould and then placing the core into a sand box; s4: filling loose sand in the sand box and compacting by using a compacting device; s5: the sand box filled with loose sand is covered with a plastic film, and is evacuated and poured with molten iron. The process effectively reduces the problem of casting scrapping caused by casting defects such as sand washing, sand inclusion and the like, simultaneously reduces the production cost, improves the working efficiency and simultaneously improves the working environment.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a full mold casting production process by matching loose sand and resin sand.
Background
The full-mould casting technology by lost foam V method is a casting technology in which the full-mould pattern (white mould) with identical structure and size of casting made of foamed plastics (such as EPS, STMMA or EPMMA) is coated with coating by dipping and dried, then embedded in quartz sand, vibrated to compact, and poured with molten metal under negative pressure to burn and gasify the white mould, and then replaced by liquid metal, cooled and solidified to form the casting.
At present, the production of iron casting by adopting a lost foam V-method solid casting process is a process technology which is commonly adopted in the casting field, the casting material used in the production is mostly loose sand (quartz sand, the granularity is 30/70 meshes), the fluidity is good, the filling is easy, and the casting can be tightly fixed around a pattern under the action of vibration and negative pressure to be cast into a qualified casting. However, for castings with complex shapes and structures, corners are arranged at multiple positions, the inner cavity is narrow, sand cannot enter easily and jolts, and the castings are scrapped due to sand washing, sand inclusion and the like when molten iron is poured.
Disclosure of Invention
The invention aims to provide a full mold casting production process by matching loose sand and resin sand, which aims to solve the problem that sand washing and sand inclusion caused by sand washing are difficult to cause sand filling and compaction in a transfer angle inner cavity of a complex casting.
In order to achieve the purpose, the invention adopts the following technical scheme:
a full mold casting production process by matching loose sand and resin sand comprises the following steps:
s1, placing the formed white mold in a drying room for drying, wherein the drying temperature is controlled to be 40-50 ℃, and the drying time is controlled to be 10-12 hours;
s2: coating the dried white mold and the pouring system, and drying in a drying room at 50-60 ℃ for 10-12 hours;
s3: filling the included angle of the white mould and the part of the loose sand which is not easy to fill with self-hardening resin sand or manufacturing a core, placing the core at the reserved position of the white mould and then placing the core into a sand box;
s4: filling loose sand in the sand box and compacting by using a compacting device;
s5: covering the sand box filled with loose sand with a plastic film, and carrying out vacuumizing and iron liquid pouring operations.
Further preferably, the gating system comprises a riser and a gating pipeline.
Further preferably, the core is molded in a core box in the step S3.
Further preferably, the jolting device is a jolting table.
Preferably, the loose sand is quartz sand with the purity of more than or equal to 90 percent and the granularity of 30-70 meshes.
Preferably, the negative pressure of air is 0.03-0.04 MPa in the vacuum-pumping process.
More preferably, the self-hardening resin sand is formed by mixing loose sand, a binder and a curing agent.
Further preferably, in S2, the coating operation is performed by dip coating and dip coating is performed twice.
The invention has the beneficial effects that:
a full-mold casting production process with loose sand and resin sand matched comprises the steps of designing a casting white mold model, drying the white mold, carrying out dip-coating process on the dried white mold to enhance the structural strength of the white mold, filling and modeling the corners of the white mold and the parts which are not easy to fill with the loose sand by using self-hardening resin sand, and fully filling the corner parts in the process. The white mould after filling is placed in a sand box, and then the filling of common loose sand is carried out, in the process, the self-hardening resin sand is only used in the corner filling and white mould modeling of the white mould, so that the production cost is reduced, and the quality of the casting is ensured. The last step is vacuum pumping and pouring, in order to maintain the constant negative pressure in the sand box, a plastic film is specially adopted to cover the opening at the upper part of the sand box, the plastic film is tightly adhered to the surface of the loose sand and the outline edge at the upper side of the sand box under the action of vacuum, the constant negative pressure is ensured, the vacuum pumping and the pouring of molten iron are carried out simultaneously, the structural characteristics of the casting are clear, and the defective rate of the casting is reduced
Drawings
FIG. 1 is a schematic view of a sand box involved in the process of the present invention;
names corresponding to the marks in the figure:
1. sand box, 2, loose sand, 3, white mold, 4, self-hardening resin sand, 5 and plastic film.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below.
Example 1 of the invention:
the invention provides a full mold casting production process by matching loose sand and resin sand, which comprises the following specific steps:
s1, placing the formed white mold in a drying room for drying, wherein the drying temperature is controlled at 40 ℃, and the drying time is controlled at 12 hours;
s2: dip-coating the dried white mold and the pouring system for two times in a dip-coating manner, and then drying in a drying room, wherein the drying temperature is controlled at 50 ℃, and the drying time is controlled at 12 hours;
s3: filling the included angle of the white mould and the part of the loose sand which is not easy to fill with self-hardening resin sand or manufacturing a core, placing the core at the reserved position of the white mould and then placing the core into a sand box;
s4: filling loose sand in the sand box and compacting by using a jolter;
s5: covering the sand box filled with the loose sand by using a plastic film, continuously vacuumizing to maintain the negative pressure in the sand box to be 0.03-0.04 MPa, and pouring molten iron.
Example 2 of the invention:
the specific steps in this example are as follows:
s1, placing the formed white mold in a drying room for drying, wherein the drying temperature is controlled at 50 ℃, and the drying time is controlled at 10 hours;
s2: dip-coating the dried white mold and the pouring system for two times in a dip-coating manner, and then drying in a drying room, wherein the drying temperature is controlled at 60 ℃, and the drying time is controlled at 10 hours;
s3: filling the included angle of the white mould and the part of the loose sand which is not easy to fill with self-hardening resin sand or manufacturing a core, placing the core at the reserved position of the white mould and then placing the core into a sand box;
s4: filling loose sand in the sand box and compacting by using a jolter;
s5: covering the sand box filled with the loose sand by using a plastic film, continuously vacuumizing to maintain the negative pressure in the sand box to be 0.03-0.04 MPa, and pouring molten iron.
Supplement and description to the casting process:
the white mold 3 is made of foam plastic, the molded white mold 3 has moisture, and the white mold 3 needs to be placed in a drying room for drying in order to avoid the influence on the quality of a casting during pouring.
The dried white mold 3 after molding needs to be dip-coated, and the purpose of dip-coating is to form a casting mold inner shell to increase the strength of the white mold 3 and increase the sand erosion resistance of the surface of the white mold so as to prevent the white mold 3 from deforming in the casting and jolting processes to cause the casting failure.
In order to solve the problem that the sand washing phenomenon is often easily caused in the pouring process because the sand scattering 2 is difficult to enter in the jolt process of some complex castings, in S3, the included angle of the white mold 3 and the part which is difficult to fill the sand scattering 2 are filled by adopting self-hardening resin sand 4, and the molding formed after filling is placed in the sand box 1 to fill the sand jolt, so that the sand washing phenomenon can be effectively prevented.
In some castings, an inner cavity exists, the shape of the inner cavity cannot be formed by a single white mold 3, at the moment, a core and a core box are adopted, and after the core is made of self-hardening resin sand 4, the core is matched with the white mold 3 for use, so that a complete casting is obtained.
Before the sand box 1 is placed into the white mold 3 and filled with the loose sand 2, the sand box is placed on a plain jolter, the plain jolter can fully and densely distribute the loose sand 2 in the internal space of the sand box 1, particularly the part contacted with the white mold 3, and the loose sand 2 is tightly and solidly attached to the white mold 3, so that the defects of castings are prevented.
The invention discloses a casting method of a lost foam casting mold, which is characterized in that a sand box 1 is only provided with an upper opening and is used for placing a white mold 3 and filling loose sand 2, and vacuumizing negative pressure pouring is an important step in a lost foam casting process, in order to ensure that vacuumizing is more sufficient, a plastic film 5 with the thickness of 0.07-0.10 mm is flatly paved at the upper opening of the sand box 1 filled with the loose sand 2, the plastic film 5 at the position does not need to be subjected to complicated binding and winding steps, the surface of the loose sand 2 is only scraped to be coplanar with the upper side outline of the sand box 1, then the plastic film 5 is flatly paved above the opening, and the plastic film 5 can be tightly attached to the surface of the loose sand 2 and the upper side outline of the sand box 1 through continuous vacuumizing operation, in the process, the negative pressure in the sand box 1 is maintained at 0.03-0.04 MPa, and the casting formed under the effect has clear structural characteristics and does not have the phenomena of sand inclusion and sand washing and pouring.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (8)
1. A full mold casting production process using loose sand and resin sand for matching is characterized in that: the method comprises the following steps:
s1, placing the formed white mold in a drying room for drying, wherein the drying temperature is controlled to be 40-50 ℃, and the drying time is controlled to be 10-12 hours;
s2: coating the dried white mold and the pouring system, and drying in a drying room at 50-60 ℃ for 10-12 hours;
s3: filling the included angle of the white mould and the part of the loose sand which is not easy to fill with self-hardening resin sand or manufacturing a core, placing the core at the reserved position of the white mould and then placing the core into a sand box;
s4: filling loose sand in the sand box and compacting by using a compacting device;
s5: covering the sand box filled with loose sand with a plastic film, and carrying out vacuumizing and iron liquid pouring operations.
2. The full mold casting production process by matching loose sand with resin sand as claimed in claim 1, characterized in that: the pouring system comprises a riser and a pouring pipeline.
3. The full mold casting production process by matching loose sand with resin sand as claimed in claim 1, characterized in that: the S3 core is formed in a core box.
4. The full mold casting production process by matching loose sand with resin sand as claimed in claim 1, characterized in that: the jolting device is a jolting platform.
5. The full mold casting production process by matching loose sand with resin sand as claimed in claim 1, characterized in that: the loose sand is quartz sand with the purity of more than or equal to 90 percent and the granularity of 30-70 meshes.
6. The full mold casting production process by matching loose sand with resin sand as claimed in claim 1, characterized in that: and in the vacuumizing process, the negative pressure of air is 0.03-0.04 Mpa.
7. The full mold casting production process by matching loose sand with resin sand as claimed in claim 1, characterized in that: the self-hardening resin sand is formed by mixing loose sand, an adhesive and a curing agent.
8. The full mold casting production process by matching loose sand with resin sand as claimed in claim 1, characterized in that: in the S2, the coating operation is carried out by adopting a dip-coating mode and dip-coating is carried out twice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624983.6A CN113369440A (en) | 2021-06-04 | 2021-06-04 | Full mold casting production process by matching loose sand and resin sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624983.6A CN113369440A (en) | 2021-06-04 | 2021-06-04 | Full mold casting production process by matching loose sand and resin sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113369440A true CN113369440A (en) | 2021-09-10 |
Family
ID=77575837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110624983.6A Pending CN113369440A (en) | 2021-06-04 | 2021-06-04 | Full mold casting production process by matching loose sand and resin sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113369440A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114850403A (en) * | 2022-05-11 | 2022-08-05 | 河南省金太阳精密铸业股份有限公司 | Casting process and casting tool for producing machine tool workbench |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1007067A (en) * | 1963-10-23 | 1965-10-13 | Monsanto Chemicals | Casting process |
| CN1446648A (en) * | 2003-01-10 | 2003-10-08 | 刘立中 | Casting box reversal type technique in vanish mould casting |
| CN102228955A (en) * | 2011-07-01 | 2011-11-02 | 李复旺 | Treatment method for deformation of massive lost foam |
| CN102744365A (en) * | 2012-06-21 | 2012-10-24 | 常州市常协柴油机机体有限公司 | Lost foam casting method of cylinder of single cylinder diesel engine |
| CN203764892U (en) * | 2013-12-09 | 2014-08-13 | 于桂菊 | Casting model of dry type cylinder sleeve engine body of engine |
| CN104624961A (en) * | 2013-11-12 | 2015-05-20 | 青岛大运机械有限公司 | Method for improving non-solid sand filling of upper concave surface on evaporative pattern casting |
| CN105537523A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Method for casting double-end blind hole part at negative pressure through evanescent mode |
| CN110014119A (en) * | 2019-06-04 | 2019-07-16 | 合肥四维铸造有限公司 | A kind of combined shaping manufacturing method of metalwork |
| CN110614346A (en) * | 2019-10-11 | 2019-12-27 | 柳州市顺昇机械有限公司 | Method for producing automobile mold by lost foam casting process |
-
2021
- 2021-06-04 CN CN202110624983.6A patent/CN113369440A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1007067A (en) * | 1963-10-23 | 1965-10-13 | Monsanto Chemicals | Casting process |
| CN1446648A (en) * | 2003-01-10 | 2003-10-08 | 刘立中 | Casting box reversal type technique in vanish mould casting |
| CN102228955A (en) * | 2011-07-01 | 2011-11-02 | 李复旺 | Treatment method for deformation of massive lost foam |
| CN102744365A (en) * | 2012-06-21 | 2012-10-24 | 常州市常协柴油机机体有限公司 | Lost foam casting method of cylinder of single cylinder diesel engine |
| CN104624961A (en) * | 2013-11-12 | 2015-05-20 | 青岛大运机械有限公司 | Method for improving non-solid sand filling of upper concave surface on evaporative pattern casting |
| CN203764892U (en) * | 2013-12-09 | 2014-08-13 | 于桂菊 | Casting model of dry type cylinder sleeve engine body of engine |
| CN105537523A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Method for casting double-end blind hole part at negative pressure through evanescent mode |
| CN110014119A (en) * | 2019-06-04 | 2019-07-16 | 合肥四维铸造有限公司 | A kind of combined shaping manufacturing method of metalwork |
| CN110614346A (en) * | 2019-10-11 | 2019-12-27 | 柳州市顺昇机械有限公司 | Method for producing automobile mold by lost foam casting process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114850403A (en) * | 2022-05-11 | 2022-08-05 | 河南省金太阳精密铸业股份有限公司 | Casting process and casting tool for producing machine tool workbench |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103372630B (en) | A kind of evaporative pattern production technology of engine cylinder-body | |
| CN105382206A (en) | Casting mold and forming method for box body of gearbox | |
| CN103212667B (en) | Production technology and the V method mould of application V method cast gear box casing | |
| CN104985119A (en) | Lost foam casting process for engine cylinder block and head | |
| CN103212669A (en) | Lost-foam casting model of engine cylinder body and casting method | |
| CN108273963B (en) | Casting method for preventing shrinkage porosity defect at thick and large wall of casting | |
| CN103658527A (en) | Vacuum seal modeling method for refrigerator cold closet plastic uptake mould casting | |
| CN113369440A (en) | Full mold casting production process by matching loose sand and resin sand | |
| CN111085659A (en) | Novel V-method composite casting process system | |
| CN105364010A (en) | Evaporative pattern casting process preventing deformation | |
| CN104985121A (en) | Casting method of vehicle medium-and-large-sized stamping die | |
| KR102179841B1 (en) | Green sand mold and its production method, and production method of iron-based casting | |
| JPS60111736A (en) | Molding method of vacuum casting mold | |
| CN205414310U (en) | Metal liquid is poured into a mould lost pattern casting that disappears and is used white membrane module | |
| CN104550708A (en) | Process for casting thick and large nodular cast iron valve plate | |
| CN101733362A (en) | Method for casting metallic mold | |
| CN105364009A (en) | Evaporative pattern casting process realizing good mechanical property for castings | |
| CN101633039A (en) | Die manufacture method for casting large breadth thin-wall complicated curved surface part | |
| CN105364008A (en) | Evaporative pattern casting process | |
| CN104624961A (en) | Method for improving non-solid sand filling of upper concave surface on evaporative pattern casting | |
| CN211248236U (en) | Motor N end cover casting mould | |
| CN112191803A (en) | Manufacturing method of large cylindrical steel ingot die casting | |
| CN106807891A (en) | A kind of evaporative pattern production technology of engine cylinder-body | |
| CN104690227A (en) | Evanescent mould casting process capable of preventing deformation | |
| CN104043791A (en) | Double layer die negative pressure gravity casting technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20210910 |