CN109530623A - A kind of preparation process of the anti-vein type sand core of water jacket of high intensity - Google Patents
A kind of preparation process of the anti-vein type sand core of water jacket of high intensity Download PDFInfo
- Publication number
- CN109530623A CN109530623A CN201811476131.1A CN201811476131A CN109530623A CN 109530623 A CN109530623 A CN 109530623A CN 201811476131 A CN201811476131 A CN 201811476131A CN 109530623 A CN109530623 A CN 109530623A
- Authority
- CN
- China
- Prior art keywords
- sand
- core
- water jacket
- high intensity
- preparation process
- 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
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to a kind of preparation processes of the anti-vein type sand core of water jacket of high intensity, liquid thermosetting resin binder, catalyst, precoated sand are configured to core sand, inside the mould core box of core sand filling preheating, sand core close to mould core box surface it is heated can polycondensation harden to obtain finished product.Liquid thermosetting resin binder is that DOPO type benzoxazine resin, ethylenediamine, diaminodiphenyl-methane, acetone, silane coupling agent are mixed.There is high-intensitive, anti-vein, without using stud using sand core of water jacket made of preparation process of the present invention, also just there is no there are the hidden danger such as loose, lack of fusion at stud, type excellent flowability is filled, inner cavity is superior in quality, stomata hidden danger is low, and core rate of giving up is no more than 2%.
Description
Technical field
The present invention relates to the preparations of engine manufacturing technology field more particularly to a kind of anti-vein type sand core of water jacket of high intensity
Technique.
Background technique
In engine manufacturing field, be thinning with lightweight be also alternate-engine cylinder body development main trend, cylinder body
The characteristics of wall thickness is more and more thinner, and precision continuous improvement is current cylinder block casting.For the cylinder body being thinning, water cavity design easily occurs
Sand hole.So cylinder block casting structure of today, proposes many new demands, existing precoated sand to precoated sand core shooting performance
It is difficult to meet the requirement of cylinder block casting structure.
Sand core of water jacket is a key in the production of bavin (vapour) oil turbine cylinder block casting, and the sand core structure is complicated, size
Precision is high, and wall is thin, and cleaning is difficult.This requires it to have the following characteristics that 1. high intensity.2. good permeability.3. room temperature and high temperature
Lower dimensionally stable, does not expand, indeformable.4. refractoriness is high, collapsibility is good.
Currently, traditional sand core of water jacket manufacture craft is using the hot core of precoated sand or to add stud.In the hot core work of precoated sand
In skill, precoated sand generallys use silica sand as raw sand, and the coefficient of thermal expansion of silica sand is higher；It adds, for bonding casting model powder
Moulding sand binder together generallys use synthetic resin and makees binder, and there are commonly phenolic resin, furane resins, isocyanic acids
Rouge, urine gastral cavity resin etc..Above-mentioned synthetic resin can generate a large amount of small molecule during solidification, hardening and overflow, that is to say, that
In subsequent casting process, sand core gas forming amount is big, easily leads to gas hole defect, requires very type/core exhaust system design
It is high；If dealt with improperly, a large amount of waste product is easily caused；Also, in process, since sand core strength is limited, it usually needs
Stud, this is easily caused at stud, and there are the hidden danger such as loose, lack of fusion.
Summary of the invention
The present invention is in view of the deficienciess of the prior art, provide a kind of preparation work of anti-vein type sand core of water jacket of high intensity
Skill, specific technical solution are as follows:
A kind of preparation process of the anti-vein type sand core of water jacket of high intensity bonds 20~28 mass parts liquid thermosetting resins
Agent, 2~3 mass parts of catalyst, 150 mass parts precoated sands are configured to core sand, inside the mould core box of core sand filling preheating, patch
The sand core of near-lying mode tool box surface it is heated can polycondensation harden to obtain finished product.
As an improvement of the above technical solution, 125~140 mass parts nice foundry sands for being preheated to 150~180 DEG C are added mixed
20~25 mass parts liquid thermosetting resin binders and 16~22 mass parts silicon carbide are added sand mixer and opened simultaneously by sand machine
Beginning overlay film, then sand mixer is added in 1.2~1.8 mass parts methenamines and 9~12 mass parts lubricants, inside sand mixer
Material progress is air-cooled, and removes sand mixer and be crushed and sieve obtaining precoated sand.
As an improvement of the above technical solution, the liquid thermosetting resin binder is by DOPO type benzoxazine tree
Rouge, ethylenediamine, diaminodiphenyl-methane, acetone, silane coupling agent are (100~120): (15~20) according to mass ratio:
(18~25): (90~110): the ratio of (20~25) is mixed.
As an improvement of the above technical solution, the lubricant is one of zinc stearate, calcium stearate or several.
As an improvement of the above technical solution, the partial size of the nice foundry sand is less than or equal to 0.18mm.
As an improvement of the above technical solution, the catalyst is alkalization attapulgite.
As an improvement of the above technical solution, 100 mass parts are crossed to the attapulgite and 3~5 mass parts highly basic of 50 meshes
Solution by stir, dry, tabletting is laminated, by thin slice 280~290 DEG C roasting 3~4 hours, then with 20~23 DEG C/
The rate of min is cooled to 40 DEG C, then obtains alkalization attapulgite in milling to the powder for crossing 200 meshes.
As an improvement of the above technical solution, the strong base solution is that the sodium hydroxide that mass fraction is 50~55% is molten
One of liquid, potassium hydroxide solution that mass fraction is 50~55%.
As an improvement of the above technical solution, the temperature of the preheating rear mold core box interior is 180~200 DEG C.
Beneficial effects of the present invention:
It is optimized by the manufacture craft to existing precoated sand and liquid thermosetting resin binder, using this hair
Sand core of water jacket made of the bright preparation process has high-intensitive, anti-vein, without using stud, and also just there is no at stud
There are the hidden danger such as loose, lack of fusion, fill type excellent flowability, and inner cavity is superior in quality, and stomata hidden danger is low, and useless core rate is no more than
2%.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
By the DOPO type benzoxazine resin of 100kg, the ethylenediamine of 15kg, the diaminodiphenyl-methane of 18kg, 90kg
Acetone, 20kg silane coupling agent be mixed and made into liquid thermosetting resin binder.
The sodium hydroxide solution that 100kg crosses the attapulgite of 50 meshes and 3kg mass fraction is 50~55% through and being stirred
Mix, dry, tabletting is laminated, by thin slice 280 DEG C roast 4 hours, be then cooled to 40 with the rate of 20~23 DEG C/min
DEG C, then alkalization attapulgite is obtained in milling to the powder for crossing 200 meshes.
Sand mixer is added in nice foundry sand of the 125kg partial size less than or equal to 0.18mm for being preheated to 150 DEG C, by 20kg liquid
Thermosetting resin adhesive and 16kg silicon carbide are added sand mixer and start simultaneously at overlay film, then 1.2kg methenamine and 9kg is hard
Sand mixer is added in resin acid zinc, air-cooled to the material progress inside sand mixer, and removes sand mixer and be crushed and sieve obtaining
Precoated sand.
20kg liquid thermosetting resin binder, 2kg catalyst, 150kg precoated sand are configured to core sand, core sand is inserted
Inside the mould core box of preheating, the temperature of the preheating rear mold core box interior is 180 DEG C, close to the sand core on mould core box surface
It is heated can polycondensation harden to obtain finished product.The tensile strength of the finished product is 3.85MPa.
Embodiment 2
By the DOPO type benzoxazine resin of 110kg, the ethylenediamine of 18kg, the diaminodiphenyl-methane of 20kg, 100kg
Acetone, 22kg silane coupling agent be mixed and made into liquid thermosetting resin binder.
The potassium hydroxide solution that 100kg crosses the attapulgite of 50 meshes and 4kg mass fraction is 50~55% through and being stirred
Mix, dry, tabletting is laminated, by thin slice 285 DEG C roast 3.5 hours, be then cooled to the rate of 20~23 DEG C/min
40 DEG C, then alkalization attapulgite is obtained in milling to the powder for crossing 200 meshes.
Sand mixer is added in nice foundry sand of the 130kg partial size less than or equal to 0.18mm for being preheated to 160 DEG C, by 23kg liquid
Thermosetting resin adhesive and 20kg silicon carbide are added sand mixer and simultaneously start simultaneously at overlay film, then by 1.5kg methenamine and 10kg
Sand mixer is added in calcium stearate, air-cooled to the material progress inside sand mixer, and removes sand mixer and carry out broken and sieve to obtain the final product
To precoated sand.
26kg liquid thermosetting resin binder, 2.7kg catalyst, 150kg precoated sand are configured to core sand, core sand is filled out
Enter inside the mould core box of preheating, the temperature of the preheating rear mold core box interior is 190 DEG C, close to the sand on mould core box surface
Core it is heated can polycondensation harden to obtain finished product.The tensile strength of the finished product is 3.87MPa.
Embodiment 3
By the DOPO type benzoxazine resin of 120kg, the ethylenediamine of 20kg, the diaminodiphenyl-methane of 25kg, 110kg
Acetone, 25kg silane coupling agent be mixed and made into liquid thermosetting resin binder.
The sodium hydroxide solution that 100kg crosses the attapulgite of 50 meshes and 5kg mass fraction is 50~55% through and being stirred
Mix, dry, tabletting is laminated, by thin slice 290 DEG C roast 3 hours, be then cooled to 40 with the rate of 20~23 DEG C/min
DEG C, then alkalization attapulgite is obtained in milling to the powder for crossing 200 meshes.
Sand mixer is added in nice foundry sand of the 140kg partial size less than or equal to 0.18mm for being preheated to 180 DEG C, by 25kg liquid
Thermosetting resin adhesive and 22kg silicon carbide are added sand mixer and simultaneously start simultaneously at overlay film, then by 1.8kg methenamine and 12kg
Sand mixer is added in calcium stearate, air-cooled to the material progress inside sand mixer, and removes sand mixer and carry out broken and sieve to obtain the final product
To precoated sand.
28kg liquid thermosetting resin binder, 3kg catalyst, 150kg precoated sand are configured to core sand, core sand is inserted
Inside the mould core box of preheating, the temperature of the preheating rear mold core box interior is 200 DEG C, close to the sand core on mould core box surface
It is heated can polycondensation harden to obtain finished product.The tensile strength of the finished product is 3.83MPa.
In the above-described embodiments, the tensile strength of finished product is in 3.8MPa or more；And the tensile strength of existing sand core is no more than
3.0MPa.It is computed, is in the theoretical swell value of length direction using the upper oil duct core that the precoated sand in embodiment 2 penetrates system
1.5mm, compared to for prior art, length expansion value reduces 3.5mm.
Nice foundry sand of the present invention is spherical nice foundry sand.Nice foundry sand has higher refractoriness and very small thermal expansion
Rate, in terms of coefficient of thermal expansion index, nice foundry sand is only 1/10 of silica sand or so, can effectively reduce the high temperature shape of thin-walled sand core of water jacket
Variable inhibits the generation of vein, is each provided with reliable guarantee to promotion core cavity dimensional accuracy and cleannes.In addition, spherical
Nice foundry sand has smaller surface area compared with pointed shape silica sand, in the case where equal volume, in this way to cold core process resin volume
Consumption is also relatively lower.Finished product only has slight vein, and vein height is less than 0.5mm, and cleaning is convenient.
The silicon carbide is the powder that partial size is less than or equal to 0.106mm.Silicon carbide stable chemical performance, thermal coefficient
Height, thermal expansion coefficient is small, fire resistance is good, resistance to thermal shock, and therefore, addition silicon carbide can improve coefficient of thermal expansion and the promotion of finished product
Fire resistance.
Lubricant is added and solves the problems, such as mulling conglomeration, long-time storage agglomeration, while lubricant is added and helps to improve
The intensity and mobility of finished product.
DOPO type benzoxazine resin is released without small molecule in the curing process, and cure shrinkage is almost nil, modulus
The characteristics such as height, intensity is big, heat-resisting good, and water absorption rate is low.Can be with Self-leveling being heated to 120 DEG C, the product UL94 after solidification is fire-retardant
Grade is V0 fire-retardant rank.Due to that will not discharge small molecule in DOPO type benzoxazine resin solidification process, this makes subsequent
In casting process, sand core gas forming amount is significantly reduced, and generating gas hole defect significantly reduces.In the present invention, using DOPO type benzo
Oxazines resin coating, subsequent equally to bond precoated sand using the resin again, engine casts cylinder body after casting because gas leakage causes
Disqualification rate than reducing 31~38% originally.
The alkalization attapulgite is catalyst, and the addition of catalyst can shorten curing time, and without heating, according to
By original mould core box heat DOPO type benzoxazine resin is heated in a short time can polycondensation hardening.Catalyst adds
Adding can will reduce by 11~16 minutes curing time.Wherein, ethylenediamine and diaminodiphenyl-methane are curing agent.
There is high-intensitive, anti-vein, without using stud using sand core of water jacket made of preparation process of the present invention,
Also just there is no there are the hidden danger such as loose, lack of fusion at stud, type excellent flowability is filled, inner cavity is superior in quality；It is sent out when coremaking
Narrow-minded, gas hole defect quantity significantly reduces, and stomata hidden danger is lower, and core rate of giving up is no more than 2%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity, it is characterised in that: by 20~28 mass parts liquid thermosettings
Property resinoid bond, 2~3 mass parts of catalyst, 150 mass parts precoated sands be configured to core sand, by the mold of core sand filling preheating
Core box interior, sand core close to mould core box surface it is heated can polycondensation harden to obtain finished product.
2. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 1, it is characterised in that: will be pre-
Sand mixer is added in 125~140 mass parts nice foundry sands of heat to 150~180 DEG C, and 20~25 mass parts liquid thermosetting resins are glued
Knot agent and 16~22 mass parts silicon carbide are added sand mixer and simultaneously start simultaneously at overlay film, then by 1.2~1.8 mass parts methenamines and
Sand mixer is added in 9~12 mass parts lubricants, the material inside sand mixer is carried out it is air-cooled, and remove sand mixer carry out it is broken and
Screening obtains precoated sand.
3. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 2, it is characterised in that: described
Liquid thermosetting resin binder is by DOPO type benzoxazine resin, ethylenediamine, diaminodiphenyl-methane, acetone, silane
Class coupling agent is (100~120): (15~20): (18~25): (90~110) according to mass ratio: the ratio of (20~25) mixes
It is made.
4. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 2, it is characterised in that: described
Lubricant is one of zinc stearate, calcium stearate or several.
5. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 2, it is characterised in that: described
The partial size of nice foundry sand is less than or equal to 0.18mm.
6. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 1, it is characterised in that: described
Catalyst is alkalization attapulgite.
7. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 6, it is characterised in that: will
100 mass parts cross the attapulgite of 50 meshes and 3~5 mass parts strong base solutions process is stirred, dried, tabletting is laminated, will
Thin slice roasts 3~4 hours at 280~290 DEG C, is then cooled to 40 DEG C with the rate of 20~23 DEG C/min, then in milling to mistake
The powder of 200 meshes obtains alkalization attapulgite.
8. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 7, it is characterised in that: described
Strong base solution be mass fraction be 50~55% sodium hydroxide solution, mass fraction be 50~55% potassium hydroxide solution in
One kind.
9. a kind of preparation process of the anti-vein type sand core of water jacket of high intensity according to claim 1, it is characterised in that: described
The temperature for preheating rear mold core box interior is 180~200 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811476131.1A CN109530623A (en) | 2018-12-04 | 2018-12-04 | A kind of preparation process of the anti-vein type sand core of water jacket of high intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811476131.1A CN109530623A (en) | 2018-12-04 | 2018-12-04 | A kind of preparation process of the anti-vein type sand core of water jacket of high intensity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109530623A true CN109530623A (en) | 2019-03-29 |
Family
ID=65853689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811476131.1A Pending CN109530623A (en) | 2018-12-04 | 2018-12-04 | A kind of preparation process of the anti-vein type sand core of water jacket of high intensity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109530623A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110465621A (en) * | 2019-09-17 | 2019-11-19 | 马鞍山市三川机械制造有限公司 | A kind of preparation method from the water base anti-vein iron casting coating of peeling |
| CN113102692A (en) * | 2021-04-19 | 2021-07-13 | 河南伟业新材料有限公司 | Manufacturing method of vein-proof sand core |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103182483A (en) * | 2011-12-29 | 2013-07-03 | 广西玉柴机器股份有限公司 | Hot core box jet nozzle |
| CN104084518A (en) * | 2014-06-13 | 2014-10-08 | 吴江市液铸液压件铸造有限公司 | Heatproof precoated sand and preparation method thereof |
| CN104325065A (en) * | 2014-10-08 | 2015-02-04 | 吴江市液铸液压件铸造有限公司 | Coated sand and preparation method thereof |
| CN106141103A (en) * | 2016-08-15 | 2016-11-23 | 合肥江淮铸造有限责任公司 | A kind of casting technique of engine cylinder-body oil duct core |
| CN107234209A (en) * | 2017-07-26 | 2017-10-10 | 成都桐林铸造实业有限公司 | A kind of precoated sand and preparation method thereof |
| CN107363216A (en) * | 2017-07-26 | 2017-11-21 | 成都桐林铸造实业有限公司 | A kind of precoated sand used in DK4 cylinder blanks jacket core and preparation method thereof |
| CN107619990A (en) * | 2017-07-25 | 2018-01-23 | 中原内配集团安徽有限责任公司 | A kind of preparation method of the Cast iron liner based on coating on inner surface |
| CN107639223A (en) * | 2017-07-25 | 2018-01-30 | 中原内配集团安徽有限责任公司 | A kind of preparation technology of Cast iron liner |
| CN108145065A (en) * | 2016-12-05 | 2018-06-12 | 青岛小米星电子科技有限公司 | A kind of moulding sand for casting |
-
2018
- 2018-12-04 CN CN201811476131.1A patent/CN109530623A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103182483A (en) * | 2011-12-29 | 2013-07-03 | 广西玉柴机器股份有限公司 | Hot core box jet nozzle |
| CN104084518A (en) * | 2014-06-13 | 2014-10-08 | 吴江市液铸液压件铸造有限公司 | Heatproof precoated sand and preparation method thereof |
| CN104325065A (en) * | 2014-10-08 | 2015-02-04 | 吴江市液铸液压件铸造有限公司 | Coated sand and preparation method thereof |
| CN106141103A (en) * | 2016-08-15 | 2016-11-23 | 合肥江淮铸造有限责任公司 | A kind of casting technique of engine cylinder-body oil duct core |
| CN108145065A (en) * | 2016-12-05 | 2018-06-12 | 青岛小米星电子科技有限公司 | A kind of moulding sand for casting |
| CN107619990A (en) * | 2017-07-25 | 2018-01-23 | 中原内配集团安徽有限责任公司 | A kind of preparation method of the Cast iron liner based on coating on inner surface |
| CN107639223A (en) * | 2017-07-25 | 2018-01-30 | 中原内配集团安徽有限责任公司 | A kind of preparation technology of Cast iron liner |
| CN107234209A (en) * | 2017-07-26 | 2017-10-10 | 成都桐林铸造实业有限公司 | A kind of precoated sand and preparation method thereof |
| CN107363216A (en) * | 2017-07-26 | 2017-11-21 | 成都桐林铸造实业有限公司 | A kind of precoated sand used in DK4 cylinder blanks jacket core and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 夏巨谌等: "《材料成形工艺》", 28 February 2010, 机械工业出版社 * |
| 韩小峰等: "《铸造生产与工艺工装设计》", 31 October 2010, 中南大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110465621A (en) * | 2019-09-17 | 2019-11-19 | 马鞍山市三川机械制造有限公司 | A kind of preparation method from the water base anti-vein iron casting coating of peeling |
| CN113102692A (en) * | 2021-04-19 | 2021-07-13 | 河南伟业新材料有限公司 | Manufacturing method of vein-proof sand core |
| CN113102692B (en) * | 2021-04-19 | 2022-07-19 | 河南伟业新材料有限公司 | Manufacturing method of vein-proof sand core |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2176575C2 (en) | Method and composition for making sleeves and other members of pouring gates and feeders for casting molds | |
| CN104325065B (en) | A kind of precoated sand and preparation method thereof | |
| CN101559472B (en) | Soluble mold core and preparation method thereof | |
| CN108907095B (en) | Casting method for rapidly casting large-scale precise casting based on 3D printing technology | |
| TWI756457B (en) | Hydraulic composition for lamination manufacturing apparatus and method for manufacturing casting mold | |
| CN104907492A (en) | Making method of surface double-walled hollow turbine blade | |
| CN104014716B (en) | Special precoated sand of engine cylinder block water jacket and preparation method of special precoated sand | |
| CN103008547B (en) | Resin sand shell mold casting method of automotive turbocharger shell | |
| CN104785709A (en) | Precoated sand for casting and preparation method thereof | |
| CN109530623A (en) | A kind of preparation process of the anti-vein type sand core of water jacket of high intensity | |
| CN103223466A (en) | Rapid metal die manufacturing method for turbine blades | |
| WO2011017864A1 (en) | Adaptive production method for mould | |
| CN104841870A (en) | Well-formed low-expansion cast precoated sand and preparation method thereof | |
| CN104690214A (en) | Precoated sand added with multiple resins for hot method and preparation method of precoated sand | |
| CN106493310A (en) | Shell casting method is covered in a kind of tide mould sand high pressure moulding | |
| CN102717026A (en) | Photo-cured mold filled with metal powder slurry and method for manufacturing photo-cured mold | |
| CN112079648A (en) | Easy-collapsibility ceramic core for precision casting and preparation method thereof | |
| CN108543917B (en) | A method of solving heat resisting steel product cavity defect | |
| US3426834A (en) | Expendable pattern for precision investment casting | |
| CN109465383A (en) | A kind of engine casting dedicated core sand of cylinder body | |
| CN113102692B (en) | Manufacturing method of vein-proof sand core | |
| JPS6311096B2 (en) | ||
| CN102382281A (en) | Resin composition, resin-based composite material and preparation method of the resin-based composite material | |
| CN104690213A (en) | Coated sand with cracking resistance, smell removal and less adhesion to sand and preparation method thereof | |
| CN104841860A (en) | Excellent-combination-property precoated sand for hot method and preparation method thereof |
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: 20190329 |