CN104475687A - Venting sand core for shell mold casting mould - Google Patents
Venting sand core for shell mold casting mould Download PDFInfo
- Publication number
- CN104475687A CN104475687A CN201410846335.5A CN201410846335A CN104475687A CN 104475687 A CN104475687 A CN 104475687A CN 201410846335 A CN201410846335 A CN 201410846335A CN 104475687 A CN104475687 A CN 104475687A
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- Prior art keywords
- core
- parts
- sand
- roughing sand
- casting
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a venting sand core for a shell mold casting mould. The sand core is of a cylindrical structure and prepared from the following materials in parts by weight: 60 to 180 parts of 30-mesh crude sand, 60 to 180 parts of 50-mesh crude sand, 20 to 60 parts of 100-mesh crude sand, and 2 to 14 parts of a binding agent; the sand core is prepared by mixing the materials, then blowing triethylamine by the cold core box process and finally curing; the adhesive is prepared from the following materials in parts by weight: 1 to 7 parts of phenolic resin, and 1 to 7 parts of isocyanate. The venting sand core with a special structure is prepared by the cold core box process and is located at a special position in the casting mould; a venting hole is formed in the top end of a top riser of the casting mould by utilizing the larger gaps among particles; the crude sands of different meshes are mixed to prepare the sand core; therefore, the venting sand core is high in venting performance and knock-out capability, the casting quality of a casting is improved, and the casting speed of the casting can be accelerated.
Description
Technical field
The present invention relates to metal casting technique field, be specifically related to a kind of shell casting casting mold exhaust core.
Background technology
For the manufacture of the material of core in Foundry Production, generally mixed according to a certain percentage by Modeling Materials such as casting model powder, moulding sand binder and additional things.Core in casting mold major part surround by the liquid metal of high temperature, and the size of supporting and location part is general less, and therefore core sand is except should having the performance of general molding sand, also requires higher intensity, gas permeability, deformability and collapsibility.Core sand is divided into clay core sand, waterglass core sand, wick sand by binding agent difference used, closes fat core sand, resin core sand etc.With the core sand of resin as binding agent, comprising: self-hardening resin core sand, Ester cured waterglass core sand, precoated sand core sand, hot box core sand, cold-box core sand.Small lot castings production can adopt air-setting binder core sand, and castings production in enormous quantities should adopt hot box core sand, cold-box core sand, and particular/special requirement foundry goods can adopt precoated sand core sand.
Core needs: the hygroscopicity that (1) is low and gas forming amount, and core moisture absorption is got damp, and will reduce the intensity of core, increases the gas forming amount of core simultaneously, makes foundry goods produce the defects such as hole.In order to reduce the generation of gas, just require that core has low hygroscopicity and gas forming amount.
(2) good gas permeability, foundry goods is in casting process, and sand mold and core temperature can sharply raise, and moisture evaporates rapidly, organic compound combustion, decomposes, and volatilization, inorganic matter generation chemical reaction, these all can produce a large amount of gas.If these gases can not successfully be discharged, just must invade molten metal inside and make foundry goods produce pore.Therefore, require that core has good gas permeability.
(3) high refractoriness, in casting process, core is burned by high-temperature liquid metal for a long time, easily makes cast(ing) surface produce scab.Therefore, require that core has higher refractoriness, avoid foundry goods to produce the defects such as scab.
(4) good knock-out capability, good knock-out capability will alleviate cleaning work amount, also improve surface quality of continuous castings simultaneously.
(5) high dimensional accuracy, core mainly forms inner chamber and the hole of foundry goods, and machining is generally all no longer carried out in these places.Therefore, require that core has high dimensional accuracy.
The core-making method of publication number a kind of cylinder cap rising head oil passage sand core that has been the disclosure of the invention of 103691890A, by designing and arranging air tube on core box, make the rising head oil passage sand core finally made can make the convenient discharge of gas when cylinder cap is cast, thus obtain high-quality cylinder head casting., proportionally mixed with PIC by bonding agent phenolic resins, be then blown into triethylamine and carry out coremaking on special cold-box core blower, gained sand core strength is high, and knock-out capability is good meanwhile, and can complexity difference processed, the core that differs in size.This invention refer to the material mixture ratio of core, but the core of this invention is slightly short of in gas permeability and knock-out capability, the product of casting easily produce pore and gradually surface of low quality.
Our factory is transformed casting mold ad-hoc location exhaust core in production practices for many years, casting mold top riser top steam vent needs core to fix it, the aluminium alloy of casting mold inside can obtain intact foundry goods after cooling down, here core has very high requirement for gas permeability and knock-out capability, but for low moist, gas forming amount and requirement of strength are not high especially, our factory uses multiple different object roughing sand to mix, proportioning is adjusted, cold-box process is used to produce the core of applicable casting mold top riser top steam vent, be widely used in now the batch production of my company general LGE project 12651084 product and general five water chestnut B10T project 23879472BB products.
Summary of the invention
Problem to be solved by this invention is to provide a kind of shell casting casting mold exhaust core, cold-box process is adopted to make the exhaust core of ad hoc structure, and be positioned over the ad-hoc location of casting mold, the intergranular gap utilizing it larger, complete the setting of casting mold top riser top steam vent, adopt different object roughing sand to be mixed, gas permeability and knock-out capability better, improve the castability of foundry goods, accelerate the casting speed of foundry goods.
A kind of shell casting casting mold exhaust core, described core is cylindrical structural, comprise the composition material of following weight portion: 30 order roughing sand: 60-180 part, 50 order roughing sand: 60-180 part, 100 order roughing sand: 20-60 part, adhesive: 2-14 part, adopts cold-box process to be blown into triethylamine solidification and makes after mixing.
As preferably, described adhesive comprises phenolic resins and isocyanates.
As preferably, the weight portion of described adhesive composition material: phenolic resins: 1-7 part, isocyanates: 1-7 part.
As preferably, described core comprises the composition material of following weight portion: 30 order roughing sand: 80-100 part, 50 order roughing sand: 100-140 part, 100 order roughing sand: 30-40 part, phenolic resins: 3-5 part, isocyanates: 3-5 part.
As preferably, described core comprises the composition material of following weight portion: 30 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 5 parts, isocyanates: 5 parts.
As preferably, described core in the vertical direction arranges steam vent.
As preferably, described core is columnar structured.
Core of the present invention is cylindrical structural, comprise the composition material of following weight portion: 30 order roughing sand: 60-180 part, 50 order roughing sand: 60-180 part, 100 order roughing sand: 20-60 part, adhesive: 2-14 part, adopts cold-box process to be blown into triethylamine solidification and makes after mixing.Described core is the ad-hoc location being positioned over casting mold, the intergranular gap utilizing it larger, complete the setting of casting mold top riser top steam vent, steam vent be designed to circle, this exhaust core described adopts cylindrical structural, 30 order roughing sand and 50 object roughing sand prices are inexpensively, now the Material selec-tion of core mostly is to roughing sand or other sand mold of more than 70 orders, its price is higher, virtually add the cost of plant produced, reduce income, and the core that roughing sand more than 70 orders is made, intensity height knock-out capability is better, but it is not very good in gas permeability, in the middle of the Foundry Production of reality, the particularly foundry goods manufacture of our factory, extraordinary gas permeability is needed to core, the defect ware of foundry goods can be prevented more, the casting speed of part can be accelerated.Body of material of the present invention is 30 order roughing sand and 50 object roughing sand, in addition 100 a small amount of order roughing sand, fully mix with adhesive, adopt cold-box process to be blown into triethylamine solidification to make, the Core properties that the roughing sand of obtained core in intensity and knock-out capability and more than 70 orders obtains is suitable, but in gas permeability, far surpass the core that the roughing sand of more than 70 orders is obtained, occur that the probability of defect ware reduces greatly, and the casting speed of whole foundry goods is greatly improved.
Described adhesive comprises phenolic resins and isocyanates, the weight portion of described adhesive composition material: phenolic resins: 1-7 part, isocyanates: 1-7 part.For the weight rate of core material, our factory is through test for many years, the best ratio of final discovery core material is 30 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 5 parts, isocyanates: 5 parts, the core green compression strength of making is at 0.01Mpa, immediately dryly strong 0.36Mpa is drawn, sand mold mobility is better, permeability is very good, knockout performance is good, the casting qualified rate that more original technology is produced improves 60%, foundry goods cooling forming time shorten about 10%, decrease the cost of casting, improve the production efficiency of factory.
Core can also be punched by puncher, and increase the permeability of exhaust core, cylinder design can also be become cylindrical shape, bottom contacts with aluminium alloy, and the design of hollow greatly can increase the gas permeability of core.
The present invention adopts cold-box process to make the exhaust core of ad hoc structure, and be positioned over the ad-hoc location of casting mold, the intergranular gap utilizing it larger, complete the setting of casting mold top riser top steam vent, different object roughing sand is adopted to be mixed, gas permeability and knock-out capability better, improve the castability of foundry goods, accelerate the casting speed of foundry goods.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structural representation that the present invention is provided with the core of steam vent;
Fig. 2 is the structural representation of the columnar structured core of the present invention.
Detailed description of the invention
Embodiment one
The invention provides a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 180 parts, 50 order roughing sand: 60 parts, 100 order roughing sand: 20 parts, phenolic resins: 7 parts, isocyanates: 7 parts.
Embodiment two
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 60 parts, 50 order roughing sand: 180 parts, 100 order roughing sand: 20 parts, phenolic resins: 7 parts, isocyanates: 7 parts.
Embodiment three
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 60 parts, 50 order roughing sand: 60 parts, 100 order roughing sand: 60 parts, phenolic resins: 7 parts, isocyanates: 7 parts.
Embodiment four
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 180 parts, 50 order roughing sand: 180 parts, 100 order roughing sand: 60 parts, phenolic resins: 7 parts, isocyanates: 7 parts.
Embodiment five
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 120 parts, 50 order roughing sand: 120 parts, 100 order roughing sand: 40 parts, phenolic resins: 7 parts, isocyanates: 7 parts.
Embodiment six
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 120 parts, 50 order roughing sand: 120 parts, 100 order roughing sand: 40 parts, phenolic resins: 5 parts, isocyanates: 5 parts.
Embodiment seven
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 120 parts, 50 order roughing sand: 120 parts, 100 order roughing sand: 40 parts, phenolic resins: 2 parts, isocyanates: 2 parts.
Embodiment eight
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 2 parts, isocyanates: 2 parts.
Embodiment nine
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 30 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 5 parts, isocyanates: 5 parts.
Embodiment ten
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 70 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 5 parts, isocyanates: 5 parts.
Embodiment 11
Present invention also offers a kind of shell casting casting mold exhaust core, described core comprises the composition material of following weight portion: 140 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 5 parts, isocyanates: 5 parts.
Above embodiment all adopts cylindrical core design scheme, and the specific performance of core is as following table:
So-called order number refers to the screen number in the length of per inch (unit length 2.54 centimetres of a regulation).For 100 orders, namely in the length of per inch, if there are 100 holes to be exactly 100 mesh sieves, hole count is more, and eyelet is also less, and the diameter representing sand is less.
As can be seen from above table, the best ratio of core material is 30 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 5 parts, isocyanates: 5 parts, the core green compression strength of making is at 0.01Mpa, immediately dryly draw strong 0.36Mpa, gas permeability, knock-out capability, sand mold mobility are all well and good.
When the consumption of adhesive does not change, when 30 object roughing sand use more, core gas permeability is all well and good, but core green compression strength, immediately dryly draw strong and knock-out capability is all unsatisfactory, adjust 30 order roughing sand and 50 order roughing sand, by the highest for the modulation of the proportioning of 50 order roughing sand, core gas permeability is still all well and good, other performance has had some to promote than embodiment one, be adjusted to the highest to 100 order roughing sand proportionings, core green compression strength, immediately dryly strong and knock-out capability is drawn to have larger lifting, but not satisfactory in permeability.
Then the component of adhesive is tested, when the ratio of adhesive in core is lower, permeability is better, and adhesive ratio in core promotes, core green compression strength, immediately dryly draw strong and knock-out capability a little to promote, but the permeability of core can decline.
Finally 30 orders and 50 order roughing sand are adjusted, increase the ratio of 50 order roughing sand, but be the reduction of the ratio of 100 order roughing sand and 30 order roughing sand, obtained core declines seldom in gas permeability, show still fine, core green compression strength, immediately dryly draw strong and knock-out capability is also all very good, greatly meet the demand of producing, and use 30 more orders and 50 order roughing sand, reduce the price of core, change the situation that the good sand mold of performance in actual production price is higher, reduce the production cost of our factory.
Embodiment ten and embodiment 11,30 order roughing sand are replaced with 70 orders and 140 object roughing sand, the core made is immediately dry to be drawn strong and green compression strength is higher, but it is very poor for gas permeability, this is worthless for vent plug core, and in the production process of these two kinds of cores, the inferior rate of product rises, and the material price of core is also higher, these two kinds designs are inadvisable.
Fig. 1 is cylindrical core, and described core 1 is cylindrical structural, and described core 1 in the vertical direction arranges steam vent 2, gets air-vent hole, improves permeability, improve 10% than cylindrical core in permeability through puncher.
Fig. 2 is cylindrical shape core, and described core 1 is cylindrical structural, and hollow design, improves permeability, and tubular construction middle part hole is comparatively large, more outstanding in permeability, improves 17% than cylindrical core in permeability.
Claims (7)
1. a shell casting casting mold exhaust core, described core is cylindrical structural, it is characterized in that: the composition material comprising following weight portion: 30 order roughing sand: 60-180 part, 50 order roughing sand: 60-180 part, 100 order roughing sand: 20-60 part, adhesive: 2-14 part, adopts cold-box process to be blown into triethylamine solidification and makes after mixing.
2. shell casting casting mold exhaust core as claimed in claim 1, is characterized in that: described adhesive comprises phenolic resins and isocyanates.
3. shell casting casting mold exhaust core as claimed in claim 1, is characterized in that: the weight portion of described adhesive composition material: phenolic resins: 1-7 part, isocyanates: 1-7 part.
4. shell casting casting mold exhaust core as claimed in claim 1, it is characterized in that: described core comprises the composition material of following weight portion: 30 order roughing sand: 80-100 part, 50 order roughing sand: 100-140 part, 100 order roughing sand: 30-40 part, phenolic resins: 3-5 part, isocyanates: 3-5 part.
5. shell casting casting mold exhaust core as claimed in claim 1, it is characterized in that: described core comprises the composition material of following weight portion: 30 order roughing sand: 100 parts, 50 order roughing sand: 140 parts, 100 order roughing sand: 30 parts, phenolic resins: 5 parts, isocyanates: 5 parts.
6. shell casting casting mold exhaust core as claimed in claim 1, is characterized in that: described core in the vertical direction arranges steam vent.
7. shell casting casting mold exhaust core as claimed in claim 1, is characterized in that: described core is columnar structured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846335.5A CN104475687A (en) | 2014-12-31 | 2014-12-31 | Venting sand core for shell mold casting mould |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846335.5A CN104475687A (en) | 2014-12-31 | 2014-12-31 | Venting sand core for shell mold casting mould |
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| CN104475687A true CN104475687A (en) | 2015-04-01 |
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| CN201410846335.5A Pending CN104475687A (en) | 2014-12-31 | 2014-12-31 | Venting sand core for shell mold casting mould |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057563A (en) * | 2015-07-28 | 2015-11-18 | 江铃汽车股份有限公司 | Cold core sand used for long and thin type sand cores |
| 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 |
| CN107377884A (en) * | 2017-07-25 | 2017-11-24 | 苏州市鑫渭阀门有限公司 | The preparation method of the high pressure stainless steel pump housing |
| CN107790628A (en) * | 2017-09-08 | 2018-03-13 | 机械科学研究总院先进制造技术研究中心 | A kind of manufacturing process and device of air blowing solidification method 3D printing casting sand type |
| CN110860646A (en) * | 2019-12-05 | 2020-03-06 | 中铁山桥集团有限公司 | Foundry sand composition and casting method |
| CN110899628A (en) * | 2019-12-25 | 2020-03-24 | 银峰铸造（芜湖）有限公司 | Triethylamine method cold box core making method and casting sand core |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057563A (en) * | 2015-07-28 | 2015-11-18 | 江铃汽车股份有限公司 | Cold core sand used for long and thin type sand cores |
| 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 |
| CN107377884A (en) * | 2017-07-25 | 2017-11-24 | 苏州市鑫渭阀门有限公司 | The preparation method of the high pressure stainless steel pump housing |
| CN107790628A (en) * | 2017-09-08 | 2018-03-13 | 机械科学研究总院先进制造技术研究中心 | A kind of manufacturing process and device of air blowing solidification method 3D printing casting sand type |
| CN110860646A (en) * | 2019-12-05 | 2020-03-06 | 中铁山桥集团有限公司 | Foundry sand composition and casting method |
| CN110860646B (en) * | 2019-12-05 | 2021-09-21 | 中铁山桥集团有限公司 | Foundry sand composition and casting method |
| CN110899628A (en) * | 2019-12-25 | 2020-03-24 | 银峰铸造（芜湖）有限公司 | Triethylamine method cold box core making method and casting sand core |
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Application publication date: 20150401 |