CN108655331A - A kind of cold core modifying agent - Google Patents
A kind of cold core modifying agent Download PDFInfo
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- CN108655331A CN108655331A CN201810555182.7A CN201810555182A CN108655331A CN 108655331 A CN108655331 A CN 108655331A CN 201810555182 A CN201810555182 A CN 201810555182A CN 108655331 A CN108655331 A CN 108655331A
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- sand
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- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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Abstract
A kind of cold core modifying agent of present invention offer and its application process, a kind of cold core modifying agent, it is characterised in that：Include the component of following weight percentage：α starch 95 96%, brown iron oxide 4 5%.The present invention can be directly used in mixed way with silica sand, it can reduce or not add special sand, and do not have the generation of vein defect, casting cost is greatly saved, the probability that the generation of the undesirable elements such as casting scab, sintering, stomata can effectively be reduced simultaneously can reach 100% to the probability for preventing casting vein defect from occurring.
Description
Technical field
The present invention relates to a kind of modifying agent, specifically relate to a kind of cold core modifying agent and its application.
Background technology
The inner cavity sand core of ironcasting uses two kinds of cold-box and hot box, based on cold-box.Cold-box core is used
Silica sand（Refer generally to quartz sand）Based on the higher silica sand of dioxide-containing silica, and the silica sand of high silicon dioxide content is in high temperature
The lower coefficient of expansion is also high, and the silica sand of high expansion coefficient easily causes sand core cracking under the effect of high temperature iron liquid, leads to core cavity
There is the defects of vein, burr and be difficult to clear up, gently then influences casting quality, it is heavy then casting is caused to be scrapped.
To improve core cavity vein defect, domestic founder author is prevented according to different working conditions using following methods
Vein generates：
One, using the low special sand of the coefficient of expansion（Refer generally to chromite sand, ceramsite sand and nice foundry sand）Instead of silica sand or mixture
A certain proportion of special sand.
Two, the time of sand core expanded by heating is delayed using the principle of the insulation of dope layer using anti-vein coating,
Inhibit molten metal to penetrate into sand core, prevents vein defect.
Three, using the anti-vein material of organic species（Such as sawdust class, plant amylum class）, such anti-vein agent is at high temperature
It can be decomposed and be burnt, there is good yielding performance, sand core expanded by heating can be alleviated, to reduce the generation of vein.
Four, using the anti-vein material of inorganic species.Mainly a kind of silicate, metal oxide are specially treated polynary
Complex chemical compound.For that in sand core or coating, can reduce the surface defects such as stomata, scab, vein, main function is to reduce stomata
Defect.
Although and above-mentioned material can reduce to a certain extent casting vein generation probability, cannot eradicate completely, and
And undesirable influence can be caused on sand core itself.Specific disadvantage is as follows：
1, special sand（Chromite sand, ceramsite sand, nice foundry sand）.Such material price is higher, and market price is the 5-8 of common silica sand
Times, a certain amount of special sand would generally be added in foundry enterprise in silica sand（It is according to the unusual addition of vein production
20%-100%）, and the generation of vein cannot be completely eliminated, it uses special sand to can avoid vein completely and generates, but production cost mistake
It is high.
2, anti-vein coating.For coating after high temperature liquid iron is cast, core cavity will appear flaxen pigment finish leather, and cleaning is difficult
Degree is big, and there are the risks that pigment finish leather falls off in Mechanical processing of casting cleaning process, and it is clear to inner cavity aberration and inner cavity cannot to meet client
The requirement of cleanliness.Basic improvement cannot be reached to core cavity vein defect, only defect form has mitigation trend.
3, the anti-vein material of organic species.Such anti-vein material addition that foundry enterprise generally uses at present is generally
The 2%-12% of roughing sand, granularity are generally 150 mesh or less.Its granularity is thicker, the material decomposition combustion after high temperature, sand core internal gap
Increasing, sand core anti-metal solution penetrating power reduces, and causes inner cavity scab to deteriorate, while sand core strength dies down after decomposition combustion,
Sand core contraction distortion influences casting critical size when serious.And the generation of vein cannot be eliminated at all.
4, the anti-vein material of inorganic species.Mainly silicates and metal oxide（Predominantly iron oxide）, such material
Material is preferable to the defect effect for reducing subcutaneous blowhole and surface pinholes, although being reduced the probability of casting vein defect, increases
The probability that casting sintering defect occurs.It can be only used as complementary elimination vein defective material, cannot be played the role of key.
For disadvantages described above, how not excessively high it to be added to the production that this on the basis of makes core cavity not have vein defect
It is raw, while the probability that can effectively reduce the generation of the undesirable elements such as casting scab, sintering, stomata is in the urgent need to address at present asks
Topic.
Invention content
There is the defects of vein, burr for current industry medium casting inner cavity, and can not disappear in the prior art or completely
Except the generation of vein, or completely eliminate vein generation cost it is excessively high, or reduce vein defect generate while but increase
The reality of other defect Probability, inventor carry out the existing method for eliminating vein by long felt, practice
Network analysis, by research and development repeatedly, successfully having developed makes casting not have the generation of vein defect, while can effectively reduce
The cold core modifying agent for the probability that the undesirable elements such as casting scab, sintering, stomata generate.Prevent casting vein defect from occurring to reach
The purpose of.
The technical proposal of the invention is realized in this way：A kind of cold core modifying agent, includes the group of following weight percentage
Point：
α starch 95-96%,
Brown iron oxide 4-5%.
Preferably, the brown iron oxide is iron oxide red.
Preferably, the α starch granules and brown iron oxide particle 90%-100% cross 200 mesh, and 0-10% crosses 100-200 mesh.
Preferably, cold core modifying agent bulk density is 0.6-0.8g/cm3.
The present invention application process be：
It is added with the roughing sand same period when cold core modifying agent mulling, cold core modifying agent addition accounts for the 0.6-1.5% of roughing sand weight.
The beneficial effects of the invention are as follows：
1, organic matter and inorganic material match mixture by a certain percentage, and the two effect is combined into one, is complemented each other, and are preventing
While casting vein generates, the probability of the undesirable elements such as casting scab, sintering, stomata generation is also reduced.
2, in 90%-100% by 200 mesh, 0-10% makes its feel exquisiteness, profit by 100-200 mesh for product granularity control
Sliding, addition is low, does not influence the mobility for being blended sand.
3, since addition is few, fine size does not have an impact sand core quality itself, after meeting high temperature liquid iron combustion decomposition
Appropriate is sand expanded by heating slot milling, and sand can effectively fill up the gap left after this product combustion decomposition, not shadow
The anti-metal melt penetrating power of musical sand core.100% can reach to the probability for preventing casting vein defect from occurring.
4, using cold core modifying agent, addition is few, and sand core cost is minimum, and becomes without inner cavity sintering, scab deterioration and size
The problems such as poor.This product can be directly used in mixed way with silica sand, it is possible to reduce or special sand is not added, and vein defect is not had
It generates, casting cost is greatly saved.
Specific implementation mode
Below by several groups of embodiments, invention is further explained, these preferred embodiments are not with any side
The formula limitation present invention, under the premise of without departing substantially from the technology of the present invention solution, to the ordinary skill of the invention done
Personnel's any modifications or changes easy to implement are both fallen within the claims in the present invention protection domain.
Embodiment 1：
A kind of cold core modifying agent, includes the component of following weight percentage：α starch 95%, brown iron oxide 5%.By organic matter and
Inorganic material presses α starch 95%, and the two effect is combined into one, complements each other by the proportions mixture of brown iron oxide 5%,
While preventing casting vein from generating, the probability of the undesirable elements such as casting scab, sintering, stomata generation is also reduced.
It is the basic embodiment of the present invention above, further can be improved, improved and limited on the basis of above：Institute
The brown iron oxide stated is iron oxide red.
It is the basic embodiment of the present invention above, further can be improved, improved and limited on the basis of above：Institute
α starch granules and brown iron oxide particle 90%-100% are stated by 200 mesh, 0-10% is less than 200 mesh by being more than 100.Make it more
Exquisiteness lubrication, does not influence the mobility of sand after mulling.
It is the basic embodiment of the present invention above, further can be improved, improved and limited on the basis of above：It is cold
Core modifying agent bulk density is 0.6-0.8g/cm3.
The present invention application process be：
It is added with the roughing sand same period when cold core modifying agent mulling, cold core modifying agent addition accounts for the 0.6-1.5% of roughing sand weight.It is added
Amount is few, and fine size does not have an impact sand core quality itself, meet after high temperature liquid iron combustion decomposition it is appropriate be heated for sand it is swollen
Swollen slot milling, sand can effectively fill up the gap left after this product combustion decomposition, not influence the anti-metal melt of sand core
Penetrating power.Because its addition is few, sand core cost is minimum, and the problems such as be deteriorated without inner cavity sintering, scab deterioration and size.
Embodiment 2：
A kind of cold core modifying agent, includes the component of following weight percentage：α starch 96%, brown iron oxide 4%.By organic matter and
Inorganic material presses α starch 96%, and the two effect is combined into one, complements each other by the proportions mixture of brown iron oxide 4%,
While preventing casting vein from generating, the probability of the undesirable elements such as casting scab, sintering, stomata generation is also reduced.
It is the basic embodiment of the present invention above, further can be improved, improved and limited on the basis of above：Institute
The brown iron oxide stated is iron oxide red.
It is the basic embodiment of the present invention above, further can be improved, improved and limited on the basis of above：Institute
α starch granules and brown iron oxide particle 90%-100% are stated by 200 mesh, 0-10% is less than 200 mesh by being more than 100.Make it more
Exquisiteness lubrication, does not influence the mobility of sand after mulling.
It is the basic embodiment of the present invention above, further can be improved, improved and limited on the basis of above：It is cold
Core modifying agent bulk density is 0.6-0.8g/cm3.
The present invention application process be：
It is added with the roughing sand same period when cold core modifying agent mulling, cold core modifying agent addition accounts for the 0.6-1.5% of roughing sand weight.It is added
Amount is few, and fine size does not have an impact sand core quality itself, meet after high temperature liquid iron combustion decomposition it is appropriate be heated for sand it is swollen
Swollen slot milling, sand can effectively fill up the gap left after this product combustion decomposition, not influence the anti-metal melt of sand core
Penetrating power.Because its addition is few, sand core cost is minimum, and the problems such as be deteriorated without inner cavity sintering, scab deterioration and size.
In embodiment 1 and embodiment 2 product and reach in the prior art effect difference it is as follows：
One, using chromite sand and nice foundry sand in the prior art 1, effect is as follows：
Y Foundry Works is according to chromite sand and quartz sand 1：1 proportional arrangement complex sand produces 4 cylinder gasoline engines using cold core process
Cylinder block passage sand core, resin amount 1.6%（Component I and component II respectively account for 50%）, when mulling, is not added with anti-vein additive, raw
There are vein defects for 10% ratio of casting water channel inner wall that output is come.Afterwards according to chromite sand and nice foundry sand 1：1 ratio is matched again
It sets complex sand to be tested, resin amount is constant, and when mulling is not added with anti-vein additive, and cylinder block passage inner cavity vein is disappeared
It removes.
According to nice foundry sand and quartz sand 1 when D Foundry Works produces cylinder cap：1 proportional arrangement complex sand, is given birth to using cold core process
Produce 6 cylinder diesel cylinder cap inlet and outlet road sand cores, resin amount 1.6%（Component I and component II respectively account for 50%）, when mulling not
Add anti-vein additive, there are vein defects for 20% ratio of casting entering and exhaust channel inner wall produced.Nice foundry sand ratio is carried afterwards
When height is to 100%（Not mixture quartz sand）, performance inner cavity vein is eliminated.
Two, as follows using anti-vein coating, effect in the prior art 2：
B Foundry Works uses enveloping field sand（SiO2 contents are 92%）Cold core process produce 6 cylinder diesel cylinder caps into, row road sand core, mulling
The anti-vein additives of Shi Bujia, test the anti-vein coating of 3 kinds of foreign brand names respectively, coating specific gravity control 1.36 ~ 1.38,
Coating hygrometric state thickness control is at 350 ~ 400 μm.Through excessively taking turns contrast test, 3 kinds of anti-vein coating are to cylinder cap entering and exhaust channel inner cavity
For vein defect without basic improvement, only defect form has mitigation trend.Anti- vein coating back cylinder cover inner cavity is used simultaneously（Water
Road, air flue）There is flaxen pigment finish leather, cleaning difficulty is big, in cylinder cap processing cleaning process and during engine use
There are the risks that pigment finish leather falls off, and cannot meet requirement of the client to inner cavity aberration and inner cavity cleannes.
Three, using the inorganic anti-vein material of species in the anti-vein material of organic species in the prior art 3 and the prior art 4,
Its effect is as follows：
S Foundry Works uses enveloping field sand（SiO2 contents are 92%）Cold core process produces 6 cylinder diesel D series cylinder cap inlet and outlet road sand
Core, when resin amount 1.8%（Component I and component II respectively account for 50%）, 5.0% certain home brands inorganic is added during normal production
Anti- vein additive, vein ratio is up to 20% or so, and entering and exhaust channel inner cavity is with slight sintering.Afterwards by anti-vein additive（Same product
Board）Addition is increased to 8.0%, and vein defect substantially eliminates, but serious sintering occurs in entering and exhaust channel inner cavity, and sintering ratio reaches
100%（Entering and exhaust channel nozzle narrow positions is blocked reality at cylinder cap 24）.
The anti-vein additive of organic of certain foreign brand name, roughing sand and the constant item of resin amount were tested later by S Foundry Works
Under part, it is 2.0% according to the anti-vein additive addition of manufacturer's recommended, is tested by small lot, vein defect substantially eliminates.
It finds that scab occurs in entering and exhaust channel inner cavity many places fillet position when casting cleaning, but can complete to clear up to clear by alloy bistrique
Clean state, much smaller compared to vein defect cleaning difficulty, additive cost also reduces 50% or so, S Foundry Works to the skill
Art scheme is totally more approved and plans to promote.
S Foundry Works finds when crossing to this batch of casting air intake duct critical size, after the anti-vein additive of the organic,
Average 2.0mm occurs for casting air intake duct size（Aggregate-value）The contraction of left and right（Table 1）.By investigation and analysis, air intake duct shrinks master
It generates in sand core drying and two stages of cast.Anti- vein agent addition is adjusted to 0.5% and 1.0% to test, is gone out
The vein defect of existing different proportion, and casting air intake duct dimensional contraction value is all higher than 1.5mm, cannot be satisfied client to product size
Required precision（Tolerance is ± 1.0mm）.
Casting dimension changes after table 1 is poured into a mould
| Size 1 | Size 2 | Size 3 | Size 4 | Size 5 | It is accumulative | Deviation | |
| Theoretical value | 120 | 120 | 120 | 120 | 120 | 600 | 0 |
| Casting 1 | 119.512 | 119.582 | 119.603 | 119.702 | 119.704 | 598.103 | -1.897 |
| Casting 2 | 119.517 | 119.626 | 119.621 | 119.662 | 119.716 | 598.142 | -1.858 |
| Casting 3 | 119.545 | 119.564 | 119.579 | 119.621 | 119.648 | 597.957 | -2.043 |
| Casting 4 | 119.587 | 119.614 | 119.627 | 119.631 | 119.639 | 598.098 | -1.902 |
| Casting 5 | 119.511 | 119.539 | 119.618 | 119.636 | 119.642 | 597.946 | -2.054 |
Four, as follows using cold core modifying agent, effect in the present invention：
6 cylinder diesel D series cylinder caps of S Foundry Works production use cold core modifying agent production entering and exhaust channel sand core instead.Roughing sand, which uses, to be enclosed
Field quartz sand（SiO2 contents are 92%）, often grind roughing sand and be quantitatively adding 300Kg, the cold core modifying agent of different proportion is added（Account for roughing sand
The 0.6 ~ 1.5% of weight）, 10s is premixed, 1.6% cold core resin, mulling 100s are added.According to cold core modifying agent addition by height
To low, real-time intensity ranging from 1.04 ~ 1.42MPa of corresponding cold core sand.Sand core surface is in pale red, and sand core densification is without loose.
Dip-coating and drying are carried out after entering and exhaust channel sand core group core（Intermediate baking area set temperature is 200 DEG C, when setting is dried
Between be 70 minutes）, it is measured to the entering and exhaust channel sand core critical size of cold core modifying agent production of different proportion is added, and with
Former technique sand core size comparison（Former technique is that the anti-vein additive of 8.0% inorganic is added）, entering and exhaust channel sand core after the drying of core group
Critical size and former process ration no significant difference（Aggregate-value difference is less than 0.2mm）.
S Foundry Works uses cold core modifying agent（Experiment）Produce 6 cylinder diesel D series cylinder cap entering and exhaust channel sand cores, statistics pair
Than cylinder cap into, row road sand core be added different proportion cold core modifying agent inner cavity quality（Vein defect is than row）, correction data is shown in
Table 2：
The sand core strength and vein situation of 2 different proportion cold core modifying agent of table
By Experimental Comparison, 6 cylinder diesel D series cylinder cap inlet and outlet road sand cores are produced using cold core modifying agent, when cold core is modified
Agent addition is at 1.0%, cylinder cap inner cavity cleannes and integrated quality（And cost）Most preferably.It is closed by three coordinate pair entering and exhaust channels
Key size measures, and is compared with former process（Former technique is that the entering and exhaust channel sand core addition anti-vein of 8.0% inorganic adds
Add agent）, when cold core modifying agent addition is in 0.6 ~ 1.5% range, cylinder cap entering and exhaust channel critical size in the margin of tolerance,
Meet drawing requirement, with former process ration without significant difference（Data are omited）.It can be seen that cold core modifying agent does not significantly affect sand core
With the stability of casting dimension, sand core and casting critical size are without overproof（Contraction distortion）Problem.
S Foundry Works combines different cylinder cap entering and exhaust channel geomeries, it is determined that the cold core of different cylinder cap entering and exhaust channel sand cores
Modifying agent additional proportion.It obtains：Under cold core manufacturing condition, roughing sand uses enveloping field quartz sand（SiO2 contents are 92%）, for
Diesel engine cylinder cover entering and exhaust channel sand core, rational cold core modifying agent additional proportion is between 1.0% ~ 1.2%（Note：Same cold core work
Under the conditions of skill, for diesel engine cylinder block or cylinder of petrol engine water channel sand cores, cold core modifying agent additional proportion is between 0.6-1.0%
It is advisable）.The defects of performance inner cavity produced is without vein, sintering, pigment finish leather and disconnected core.
Product and the difference of cost in the prior art are as follows in embodiment 1 and embodiment 2：
The common used material cost for improving inner cavity cleannes in Comprehensive Correlation cold core modifying agent and casting industry, is produced with S Foundry Works
6 cylinder diesel D series cylinder cap air intake duct sand cores（Sand core weight 6.5Kg) it is compared as calculating benchmark.It is calculated：It uses
100% nice foundry sand or nice foundry sand add the complex sand of chromite sand, sand core cost highest；Use inorganic and organic anti-vein additive
The problems such as sand core cost is relatively low, but there are inner cavity sintering, scab deterioration, dimension overproofs；Most using cold core modifying agent sand core cost
It is low, and without the sintering of derivative inner cavity, scab deterioration and dimension overproof problem.Correction data such as table 3：
Air intake duct core material cost under the conditions of 3 different additive of table（It is not resinous）
Organic matter and inorganic material effect are combined into one by the present invention by the proportioning mixture in embodiment 1 and embodiment 2,
It complements each other, while preventing casting vein from generating, also reduces the generation of the undesirable elements such as casting scab, sintering, stomata
Probability.
When product granularity control in 90%-100% by 200 mesh, when 0-10% is by 100-200 mesh, make its finer and smoother profit
It is sliding, the mobility of sand is not influenced after mulling.This product feel is fine and smooth, lubricates, and addition is low, does not influence the flowing for being blended sand
Property.Since addition is few, fine size does not have an impact sand core quality itself, appropriate after chance high temperature liquid iron combustion decomposition
For sand expanded by heating slot milling, sand can effectively fill up the gap left after this product combustion decomposition, not influence sand core
Anti-metal melt penetrating power.100% can reach to the probability for preventing casting vein defect from occurring.
When using cold core modifying agent, addition is few, and sand core cost is minimum, and without inner cavity sintering, scab deterioration and size
The problems such as variation.This product can be directly used in mixed way with silica sand, it is possible to reduce or special sand is not added, and vein defect is not had
Generation, casting cost is greatly saved.
It should be noted that embodiments described above is to the illustrative and not limiting of technical solution of the present invention, affiliated skill
The equivalent replacement of the those of ordinary skill in art field or other modifications for being made according to the prior art are as long as no beyond the present invention
The thinking and range of technical solution should be included in right of the presently claimed invention within the scope of.
Claims (5)
1. a kind of cold core modifying agent, it is characterised in that：Include the component of following weight percentage：
α starch 95-96%,
Brown iron oxide 4-5%.
2. a kind of cold core modifying agent according to claim 1, it is characterised in that：The brown iron oxide is iron oxide red.
3. a kind of cold core modifying agent according to claim 1, it is characterised in that：The α starch granules and brown iron oxide
Grain 90%-100% crosses 200 mesh, and 0-10% crosses 100-200 mesh.
4. a kind of cold core modifying agent according to claim 1, it is characterised in that：Cold core modifying agent bulk density is 0.6-
0.8g/cm³。
5. a kind of application process of cold core modifying agent according to claim 1, it is characterised in that：When cold core modifying agent mulling
It is added with the roughing sand same period, cold core modifying agent addition accounts for the 0.6-1.5% of roughing sand weight.
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| CN201810555182.7A CN108655331A (en) | 2018-06-01 | 2018-06-01 | A kind of cold core modifying agent |
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Family
ID=63774391
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110125322A (en) * | 2019-06-17 | 2019-08-16 | 大连安龙鑫机械有限公司 | A kind of anti-vein additive for casting |
| CN110523915A (en) * | 2019-09-30 | 2019-12-03 | 安徽信息工程学院 | A kind of moulding sand additive and molding sand of anti-ironcasting scab |
| CN110560641A (en) * | 2019-09-20 | 2019-12-13 | 中国重汽集团济南动力有限公司 | Water jacket sand core of integral cylinder cover of engine and preparation process |
| CN111438333A (en) * | 2020-04-21 | 2020-07-24 | 合肥江淮铸造有限责任公司 | Novel sand core for casting |
| CN113084080A (en) * | 2021-04-19 | 2021-07-09 | 河南伟业新材料有限公司 | Anti-vein agent for casting production |
| 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 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113084080A (en) * | 2021-04-19 | 2021-07-09 | 河南伟业新材料有限公司 | Anti-vein agent for casting production |
| 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 |
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