CN113579169A - Method for reducing sand inclusion of casting - Google Patents
Method for reducing sand inclusion of casting Download PDFInfo
- Publication number
- CN113579169A CN113579169A CN202110770963.XA CN202110770963A CN113579169A CN 113579169 A CN113579169 A CN 113579169A CN 202110770963 A CN202110770963 A CN 202110770963A CN 113579169 A CN113579169 A CN 113579169A
- Authority
- CN
- China
- Prior art keywords
- sand
- casting
- mold
- inclusion
- easy
- 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 55
- 238000005266 casting Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000000116 mitigating effect Effects 0.000 claims 5
- 230000007547 defect Effects 0.000 abstract description 8
- 239000003110 molding sand Substances 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 5
- 101001031591 Mus musculus Heart- and neural crest derivatives-expressed protein 2 Proteins 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 206010000496 acne Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/12—Accessories
- B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a method for reducing sand inclusion of a casting, wherein the surface of the casting is provided with a rib protruding out of the surface of the casting, and a plurality of protruding nails are arranged on two side surfaces of the rib easy to inclusion, namely a plurality of nail grooves are added at corresponding positions of a sand mold for manufacturing the casting; the bulge spikes are added on the casting, so that the expansive force of the molding sand can be dispersed, and the sand inclusion defect of the positions where the bulge spikes are arranged can be reduced; and the cleaning and the removal are convenient, the yield is improved, and the production cost of enterprises is reduced.
Description
Technical Field
The invention relates to the field of casting, in particular to a method for reducing sand inclusion of a casting.
Background
The casting sand inclusion is also called scab in northern China and called as a clamp in southern China, metal inclusions and flaky or nodular objects formed by molding sand or slag and the like are arranged on the surface of the casting, the raised pimple of the casting is chiseled off, a sunken groove or a sunken pool is formed on the local surface of the casting, and the sand inclusion defect of the casting generally occurs in wet-mold casting and is one of the common defects of casting scrapping; the reason for sand inclusion of the casting is considered by modern sand inclusion theory, and the mechanism for sand inclusion is that the surface of the sand mould is subjected to the thermal action of high-temperature metal liquid in the pouring process, the moisture of the surface layer migrates inwards, so that a dry layer is formed on the surface, and a layer of weak abrasive belt with high humidity and low strength is generated inside; meanwhile, the sand is heated to generate phase change, and volume expansion is generated; when the expansion stress is greater than the strength of the weak abrasive belt, the layer slides to make the surface dry layer bend and deform, and the surface dry layer is separated from the weak abrasive belt and protrudes, so that the surface crack is infiltrated by liquid metal, and the sand inclusion defect is produced.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a method for reducing sand inclusion of a casting, wherein the bulge spikes are added on the casting to disperse the expansion force of molding sand and reduce the sand inclusion defect at the positions where the bulge spikes are arranged; and the casting is convenient to clean and remove, and a concave groove or a concave pond can not be formed on the local surface of the casting, so that the yield is improved, and the production cost of an enterprise is reduced.
The technical scheme is that the method for reducing sand inclusion of the casting is characterized in that ribs protruding out of the surface of the casting are arranged on the surface of the casting, and a plurality of protruding nails are arranged on two sides of each rib easy to inclusion, namely a plurality of nail grooves are additionally arranged at corresponding positions of a sand core for manufacturing the casting.
Furthermore, a plurality of the convex nails are symmetrically arranged on two side surfaces of the easy sand inclusion rib.
Further, the plurality of convex nails on each side of the sand-easily-sandwiching rib can be arranged at equal intervals.
Further, the height of the convex nails is not more than the height of the easy sand inclusion ribs.
Further, the convex nails are conical convex points.
Further, the application comprises the following steps:
step 3, preparing a sand mold through the improved mold in the step 2, and assembling the sand core;
step 4, pouring molten metal into the sand mold after mold assembling, and cooling;
step 5, removing the cooled sand mold, and opening a cast after pouring;
and 6, polishing and removing the convex nails on the casting.
The method has the beneficial effects that the bulge nails are added on the casting to disperse the expansion force of the molding sand and reduce the sand inclusion defect at the positions where the bulge nails are arranged; and the cleaning and the removal are convenient, the yield is improved, and the production cost of enterprises is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
1. the sand bars are easy to be included; 2. and (4) protruding nails.
Detailed Description
The technical content of the invention is explained in detail with reference to the following specific examples:
as shown in figure 1, the technical scheme is that the method for reducing sand inclusion of the casting is characterized in that ribs protruding out of the surface of the casting are arranged on the surface of the casting, and a plurality of protruding spikes 2 are arranged on two sides of each easy sand inclusion rib 1, namely a plurality of spike grooves are added at corresponding positions of a sand core for manufacturing the casting.
The plurality of convex nail-shaped objects 2 are symmetrically arranged at two sides of the easy sand inclusion rib 1; the plurality of convex nails 2 on each side of the sand-easy-to-clamp rib 1 can be arranged at equal intervals; the height of the convex nail-shaped object 2 is not more than the height of the easy sand inclusion rib 1; protruding nail form thing 2 is the circular cone bump, through the bulging force that sets up the 2 dispersible molding sand of protruding nail form thing, alleviates sand inclusion defect.
The application comprises the following steps:
step 3, preparing a sand mold through the improved mold in the step 2, and assembling the sand core;
step 4, pouring molten metal into the sand mold after mold assembling, and cooling;
step 5, removing the cooled sand mold, and opening a cast after pouring;
and 6, polishing and removing the convex nails 2 on the casting.
In summary, the present invention is only a preferred embodiment of the present invention, and is not limited to the above embodiments, and although the present invention has been disclosed by the preferred embodiments, it is not limited to the above embodiments, and those skilled in the art can make various changes and modifications to the equivalent embodiments without departing from the scope of the present invention.
Claims (6)
1. A method for reducing sand inclusion of a casting is characterized in that a plurality of convex nails are arranged on two side faces of a sand inclusion rib, namely a plurality of nail grooves are added at corresponding positions of a sand mold for manufacturing the casting.
2. A method of mitigating sand entrapment in a casting as claimed in claim 1, wherein: the plurality of convex nails are arranged on two sides of the easy sand inclusion rib.
3. A method of mitigating sand entrapment in a casting as claimed in claim 2, wherein: the plurality of convex nails on each side surface of the easy sand inclusion rib can be arranged at equal intervals.
4. A method of mitigating sand entrapment in a casting as claimed in claim 1, wherein: the height of the convex nails is not more than the height of the easy sand inclusion ribs.
5. A method of mitigating sand entrapment in a casting as claimed in any one of claims 1 to 4, wherein: the convex nails are conical convex points.
6. A method of mitigating sand entrapment in a casting as claimed in claim 1, wherein: the application comprises the following steps:
step 1, obtaining positions where sand inclusion ribs are easy to generate according to produced castings;
step 2, improving the mold for manufacturing the sand core of the mold casting, namely finding out ribs corresponding to positions of the sand inclusion ribs which are easy to generate on the mold, and arranging a plurality of convex nails on two side surfaces of each rib;
step 3, preparing a sand mold through the improved mold in the step 2, and assembling the sand mold;
step 4, pouring molten metal into the sand mold after mold assembling, and cooling;
step 5, removing the cooled sand mold, and opening a cast after pouring;
and 6, polishing and removing the convex nails on the casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110770963.XA CN113579169A (en) | 2021-07-08 | 2021-07-08 | Method for reducing sand inclusion of casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110770963.XA CN113579169A (en) | 2021-07-08 | 2021-07-08 | Method for reducing sand inclusion of casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113579169A true CN113579169A (en) | 2021-11-02 |
Family
ID=78246334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110770963.XA Pending CN113579169A (en) | 2021-07-08 | 2021-07-08 | Method for reducing sand inclusion of casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113579169A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020076571A1 (en) * | 2000-12-14 | 2002-06-20 | Johnson Robert Alan | Salvaged castings and methods of salvaging castings with defective cast cooling bumps |
| US20020150672A1 (en) * | 2001-04-13 | 2002-10-17 | Johnson Robert Alan | Method of salvaging castings with defective cast cooling bumps |
| CN201394634Y (en) * | 2009-05-08 | 2010-02-03 | 广西玉柴机器股份有限公司 | Sand inclusion prevention exterior die |
| JP2014065058A (en) * | 2012-09-26 | 2014-04-17 | Aisin Takaoka Ltd | Manufacturing method of casting, and casting product |
| CN108907614A (en) * | 2018-06-29 | 2018-11-30 | 中国船舶重工集团柴油机有限公司 | A kind of marine diesel runs through the process of the anti-burning into sand of bolt hole |
-
2021
- 2021-07-08 CN CN202110770963.XA patent/CN113579169A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020076571A1 (en) * | 2000-12-14 | 2002-06-20 | Johnson Robert Alan | Salvaged castings and methods of salvaging castings with defective cast cooling bumps |
| US20020150672A1 (en) * | 2001-04-13 | 2002-10-17 | Johnson Robert Alan | Method of salvaging castings with defective cast cooling bumps |
| CN201394634Y (en) * | 2009-05-08 | 2010-02-03 | 广西玉柴机器股份有限公司 | Sand inclusion prevention exterior die |
| JP2014065058A (en) * | 2012-09-26 | 2014-04-17 | Aisin Takaoka Ltd | Manufacturing method of casting, and casting product |
| CN108907614A (en) * | 2018-06-29 | 2018-11-30 | 中国船舶重工集团柴油机有限公司 | A kind of marine diesel runs through the process of the anti-burning into sand of bolt hole |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101530892A (en) | Investment casting thin-walled part casting method | |
| CN103861999A (en) | Method for improving bottom deformation of multi-cavity ceramic die shell in directional solidification process | |
| CN104057025A (en) | Casting technology for high-chromium iron double-suction impeller | |
| CN101444838A (en) | Method for casting large jigger wheel with counterbalance | |
| CN105081227A (en) | Method of producing same-edition split mould capable of generating two pieces in one box | |
| CN110842150B (en) | Assembled frog casting system and method | |
| CN113579169A (en) | Method for reducing sand inclusion of casting | |
| CN109175250A (en) | A kind of graphite casting mould casting method that can partially reuse | |
| CN201841240U (en) | Dead head top exhaust device of sand-prevention air hole | |
| CN108927492A (en) | A kind of cast steel intermediate product of diesel engine manufacturing process | |
| CN210280581U (en) | Casting mold for brake drum | |
| CN204075070U (en) | Nut casting sand mold | |
| CN202715766U (en) | Core box | |
| CN109351949A (en) | A kind of imbedding process of composite hammer head | |
| CN102706920A (en) | Method for evaluating mixed crystal formation tendency of single-crystal high-temperature alloys | |
| CN111482561B (en) | Die casting device and die casting production method | |
| CN112605346B (en) | Casting method of hook body for hook of ultra-deep well petroleum drilling rig hoisting system | |
| CN101376205A (en) | Method for producing gantry miller body integrated molding | |
| CN104607594A (en) | Casting production technology of alloy spring seat | |
| CN112846081A (en) | Casting production method of cold-iron-free wind power bearing block | |
| CN201832952U (en) | Pouring cup convenient for removing after being poured | |
| CN103128268B (en) | For the method for low temperature shake out in large extra thick plate blank | |
| CN111515341A (en) | Method for improving internal quality of high manganese steel frog and reducing production cost | |
| CN219788739U (en) | Mould core of zircon jade lattice brick | |
| CN2575120Y (en) | Carding type separating combing flat |
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: 20211102 |