CN108188340A - A kind of aluminum alloy cylinder cover oil passage sand core - Google Patents
A kind of aluminum alloy cylinder cover oil passage sand core Download PDFInfo
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- CN108188340A CN108188340A CN201810124624.2A CN201810124624A CN108188340A CN 108188340 A CN108188340 A CN 108188340A CN 201810124624 A CN201810124624 A CN 201810124624A CN 108188340 A CN108188340 A CN 108188340A
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- sand
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- ceramic
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Classifications
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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
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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
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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 present invention relates to a kind of aluminum alloy cylinder cover oil passage sand core, including mixed sand and binding agent；The mixed sand is made of ceramic sand and nice foundry sand, and the weight ratio of the ceramic sand and nice foundry sand is 1:(3~4)；The binding agent accounts for the 1.2~1.5% of total weight.For the sand core of the present invention using ceramic sand and nice foundry sand as main material, shape is spherical shape, and certain gap is retained between sand grains, is conducive to defeated and dispersed；And the present invention studies the mixed proportion of ceramic sand and nice foundry sand, sand core obtained is made to have higher flexural strength and preferable collapsibility simultaneously, flexural strength reaches 70~80kgf/cm2, gas forming amount≤10ml/g, mobility≤45S.
Description
Technical field
The present invention relates to casting technology field more particularly to a kind of aluminum alloy cylinder cover oil passage sand cores.
Background technology
In the production of cylinder cap, high-pressure oil duct moulding is elongated, as shown in Figure 1, length reaches 380mm, core print thickness 6mm,
Corresponding sand core moulding is crucial technological difficulties.The high-pressure oil duct core of existing sand molding, flexural strength is relatively low, in logistics and
Group core process easily snaps off.Fig. 2 is the picture of traditional sand core under an electron microscope, and traditional molding sand is using quartz sand as main
Material, shape is irregular, and the gap between sand grains is closer, is unfavorable for the defeated and dispersed of sand core, leads to that collapsibility is poor, knockout rate is low
With scab problem.
Invention content
Based on this, the object of the present invention is to provide a kind of aluminum alloy cylinder cover oil passage sand cores, strong with higher anti-folding
Degree and preferable collapsibility.
The purpose of the present invention is what is be achieved through the following technical solutions：A kind of aluminum alloy cylinder cover oil passage sand core, including mixing
Sand and binding agent；The mixed sand is made of ceramic sand and nice foundry sand, and the weight ratio of the ceramic sand and nice foundry sand is 1:(3~
4)；The binding agent accounts for the 1.2~1.5% of total weight.
Ceramic sand sand grains is spherical in shape, the smooth not disfiguring workpiece in surface, and hardness is high, long lifespan, elastic good, sand in sandblasting procedures
Grain multi-angle rebound, while there is elimination stress, improve the effect of molding sand collapsibility；Nice foundry sand sand grains is spherical in shape, good fluidity,
Easy reality of pounding, can improve sand core strength, and good permeability, surface is smooth, compact structure so that binding agent energy uniform fold.Relatively
In the prior art, for sand core of the invention using ceramic sand and nice foundry sand as main material, shape is spherical shape, between sand grains
Retain certain gap, be conducive to defeated and dispersed；And the present invention studies the mixed proportion of ceramic sand and nice foundry sand, due to treasured
The refractoriness of pearl sand is higher (>=1790 DEG C), and casting part (position that hole, slot and thermal center are concentrated) is susceptible to scab problem,
Clear up relatively difficult, therefore the content of nice foundry sand cannot be excessively high, and otherwise collapsibility can be had an impact, in addition the content of ceramic sand
Cannot be excessively high, otherwise flexural strength can be had an impact, the present invention selects ceramic sand and nice foundry sand by scientific analysis and experiment
Weight ratio ranging from 1:(3~4), ceramic sand and nice foundry sand under the proportioning can not only give full play to each self-applying, and phase
Mutual coordinated makes sand core obtained have higher flexural strength and preferable collapsibility simultaneously, and flexural strength reaches 70
~80kgf/cm2, gas forming amount≤10ml/g, mobility≤45S.
Further, the weight ratio of the ceramic sand and nice foundry sand is 1:4.
Further, the size distribution of the mixed sand is：The mixed sand that mesh number is 30~50 accounts for 1~15%, mesh number 50
~100 mixed sand accounts for 65~95%；The mixed sand of mesh number 100~170 accounts for 1~20%；The mixed sand of mesh number 170~270 accounts for 1
~5%.If sand core granularity is too big, it can lead to that cast(ing) surface is relatively rough, and finish is poor；If sand core granularity is too small, sand grains it
Between gap very little, mo ld void can be caused poor, casting has stomata generation.Therefore the present invention will be using the sand of different thicknesses granularity
Grain is mixed, and granularity is divided into four levels, main granularity that coarseness that respectively mesh number is 30~50, mesh number are 50~100,
The graininess that the fine granularity and mesh number that mesh number is 100~170 are 170~270, formed between adjacent relatively coarse sand granule it is certain between
Gap ensures gas permeability, and can be filled compared with the gap formed between coarse sand granule with compared with fine sand, improves cast(ing) surface smoothness.
Further, the size distribution of the mixed sand is：The mixed sand that mesh number is 30~50 accounts for 15%, and mesh number 50~
100 mixed sand accounts for 65%；The mixed sand of mesh number 100~170 accounts for 15%；The mixed sand of mesh number 170~270 accounts for 5%.
Further, the size distribution of the mixed sand is：The mixed sand that mesh number is 30~50 accounts for 10%, and mesh number 50~
100 mixed sand accounts for 75%；The mixed sand of mesh number 100~170 accounts for 12%；The mixed sand of mesh number 170~270 accounts for 3%.
Further, the size distribution of the mixed sand is：The mixed sand that mesh number is 30~50 accounts for 5%, mesh number 50~100
Mixed sand account for 85%；The mixed sand of mesh number 100~170 accounts for 9%；The mixed sand of mesh number 170~270 accounts for 1%.
Further, mesh number is in 30~50 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh number
For in 50~100 mixed sand, the weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh number is 100~170 mixed sand
In, the weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh number is in 170~270 mixed sand, ceramic sand and nice foundry sand
Weight ratio is 1:(3~4).The sand grains that ceramic sand and nice foundry sand employ different thicknesses granularity is mixed, and can be improved not
With thick association between fine-grained ceramic sand and ceramic sand, between nice foundry sand and nice foundry sand and between ceramic sand and nice foundry sand
Same-action makes the structure of integral sand core and performance profile more uniform.
Further, mesh number is in 30~50 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is 50
In~100 mixed sand, the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number be 100~170 mixed sand in, ceramic sand with
The weight ratio of nice foundry sand is 1:4；Mesh number is in 170~270 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4.
Further, the binding agent is phenolic resin.Phenolic resin keeps certain for sand core to be made to be bonded after heated
Moulding.
Further, the flexural strength of the sand core is 70~80kgf/cm2, gas forming amount≤10ml/g, mobility≤
45S.Sand core flexural strength is 70~80kgf/cm2It can prevent from being broken off during logistics and group core, gas forming amount≤10ml/g
The gas hole defect of casting can be effectively reduced, mobility≤45S can make to keep the good ability being mutually shifted between sand grains, improve sand
Core uniformity.
In order to better understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Description of the drawings
Fig. 1 is cylinder cap high-pressure oil duct core sand moulding figure.
Fig. 2 is the picture of traditional sand core under an electron microscope.
Fig. 3 is the picture of the sand core of the present invention under an electron microscope.
Specific embodiment
The present invention provides a kind of aluminum alloy cylinder cover oil passage sand core, including mixed sand and binding agent；The mixed sand is by ceramics
The weight ratio of sand and nice foundry sand composition, the ceramic sand and nice foundry sand is 1:(3~4)；The binding agent account for total weight 1.2~
1.5%.
Specifically, the size distribution of the mixed sand is：The mixed sand that mesh number is 30~50 accounts for 1~15%, and mesh number 50~
100 mixed sand accounts for 65~95%；The mixed sand of mesh number 100~170 accounts for 1~20%；The mixed sand of mesh number 170~270 accounts for 1~
5%.
Specifically, mesh number is in 30~50 mixed sand, the weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh number is
In 50~100 mixed sand, the weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh number be 100~170 mixed sand in,
The weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh number is the weight of ceramic sand and nice foundry sand in 170~270 mixed sand
Amount is than being 1:(3~4).
Specifically, the binding agent is phenolic resin.
Referring to Fig. 3, its picture of sand core for the present invention under an electron microscope.It is from the figure, it can be seen that of the invention
Ceramic sand and nice foundry sand shape be spherical shape, sand grains has different thickness granularities, retains certain gap between sand grains, has
Conducive to ventilative and defeated and dispersed.
Embodiment 1
The aluminum alloy cylinder cover oil passage sand core of the present embodiment, component include by weight：98.8 parts of mixed sand, phenolic resin
1.2 part；Wherein, mixed sand includes：19.76 parts of ceramic sand, 79.04 parts of nice foundry sand.
The size distribution of mixed sand is：The mixed sand that mesh number is 30~50 accounts for 15%, and the mixed sand of mesh number 50~100 accounts for
65%；The mixed sand of mesh number 100~170 accounts for 15%；The mixed sand of mesh number 170~270 accounts for 5%.
Wherein, mesh number is in 30~50 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is 50~100
Mixed sand in, the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is ceramic sand and mound in 100~170 mixed sand
The weight ratio of sand is 1:4；Mesh number is in 170~270 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4.
Embodiment 2
The aluminum alloy cylinder cover oil passage sand core of the present embodiment, component include by weight：98.6 parts of mixed sand, phenolic resin
1.4 part；Wherein, mixed sand includes：19.72 parts of ceramic sand, 78.88 parts of nice foundry sand.
The size distribution of mixed sand is：The mixed sand that mesh number is 30~50 accounts for 10%, and the mixed sand of mesh number 50~100 accounts for
75%；The mixed sand of mesh number 100~170 accounts for 12%；The mixed sand of mesh number 170~270 accounts for 3%.
Wherein, mesh number is in 30~50 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is 50~100
Mixed sand in, the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is ceramic sand and mound in 100~170 mixed sand
The weight ratio of sand is 1:4；Mesh number is in 170~270 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4.
Embodiment 3
The aluminum alloy cylinder cover oil passage sand core of the present embodiment, component include by weight：98.5 parts of mixed sand, phenolic resin
1.5 part；Wherein, mixed sand includes：19.7 parts of ceramic sand, 78.8 parts of nice foundry sand.
The size distribution of mixed sand is：The mixed sand that mesh number is 30~50 accounts for 5%, and the mixed sand of mesh number 50~100 accounts for
85%；The mixed sand of mesh number 100~170 accounts for 9%；The mixed sand of mesh number 170~270 accounts for 1%.
Wherein, mesh number is in 30~50 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is 50~100
Mixed sand in, the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is ceramic sand and mound in 100~170 mixed sand
The weight ratio of sand is 1:4；Mesh number is in 170~270 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4.
The key parameter comparison such as the following table 1 of the sand core of 1-3 of the embodiment of the present invention and traditional sand core：
The molding sand of 1 embodiment 1-3 of table and the key parameter of traditional molding sand compare
It can be seen that, compared to traditional sand core, sand core of the present invention has higher flexural strength and smaller hair from table
Tolerance, while preferable mobility is kept, the additive amount of resin is smaller.
Relative to the prior art, using ceramic sand and nice foundry sand as main material, shape is sand core of the invention
Spherical shape retains certain gap between sand grains, is conducive to defeated and dispersed；And the present invention to the mixed proportion of ceramic sand and nice foundry sand and
Thickness granularity is studied, make sand core obtained have simultaneously higher flexural strength, preferable collapsibility and mobility, with
And smaller gas forming amount, solve the problems, such as that existing cylinder cap high-pressure oil duct sand core moulding and knockout are difficult.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.
Claims (10)
1. a kind of aluminum alloy cylinder cover oil passage sand core, it is characterised in that：Including mixed sand and binding agent；The mixed sand is by ceramic sand
It is formed with nice foundry sand, the weight ratio of the ceramic sand and nice foundry sand is 1:(3~4)；The binding agent account for total weight 1.2~
1.5%.
2. aluminum alloy cylinder cover oil passage sand core according to claim 1, it is characterised in that：The weight of the ceramic sand and nice foundry sand
Amount is than being 1:4.
3. aluminum alloy cylinder cover oil passage sand core according to claim 1, it is characterised in that：The size distribution of the mixed sand
For：The mixed sand that mesh number is 30~50 accounts for 1~15%, and the mixed sand of mesh number 50~100 accounts for 65~95%；Mesh number 100~170
Mixed sand accounts for 1~20%；The mixed sand of mesh number 170~270 accounts for 1~5%.
4. aluminum alloy cylinder cover oil passage sand core according to claim 3, it is characterised in that：The size distribution of the mixed sand
For：The mixed sand that mesh number is 30~50 accounts for 15%, and the mixed sand of mesh number 50~100 accounts for 65%；The mixed sand of mesh number 100~170
Account for 15%；The mixed sand of mesh number 170~270 accounts for 5%.
5. aluminum alloy cylinder cover oil passage sand core according to claim 3, it is characterised in that：The size distribution of the mixed sand
For：The mixed sand that mesh number is 30~50 accounts for 10%, and the mixed sand of mesh number 50~100 accounts for 75%；The mixed sand of mesh number 100~170
Account for 12%；The mixed sand of mesh number 170~270 accounts for 3%.
6. aluminum alloy cylinder cover oil passage sand core according to claim 3, it is characterised in that：The size distribution of the mixed sand
For：The mixed sand that mesh number is 30~50 accounts for 5%, and the mixed sand of mesh number 50~100 accounts for 85%；The mixed sand of mesh number 100~170 accounts for
9%；The mixed sand of mesh number 170~270 accounts for 1%.
7. aluminum alloy cylinder cover oil passage sand core according to claim 3, it is characterised in that：Mesh number is 30~50 mixed sand
In, the weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh number is in 50~100 mixed sand, ceramic sand and nice foundry sand
Weight ratio is 1:(3~4)；Mesh number is in 100~170 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:(3~4)；Mesh
Number is in 170~270 mixed sand, the weight ratio of ceramic sand and nice foundry sand is 1:(3~4).
8. aluminum alloy cylinder cover oil passage sand core according to claim 7, it is characterised in that：Mesh number is 30~50 mixed sand
In, the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number is the weight ratio of ceramic sand and nice foundry sand in 50~100 mixed sand
It is 1:4；Mesh number is in 100~170 mixed sand, and the weight ratio of ceramic sand and nice foundry sand is 1:4；Mesh number be 170~270 it is mixed
It closes in sand, the weight ratio of ceramic sand and nice foundry sand is 1:4.
9. aluminum alloy cylinder cover oil passage sand core according to claim 1, it is characterised in that：The binding agent is phenolic resin.
10. the aluminum alloy cylinder cover oil passage sand core described in any claim in claim 1-9, it is characterised in that：Institute
The flexural strength for stating sand core is 70~80kgf/cm2, gas forming amount≤10ml/g, mobility≤45S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810124624.2A CN108188340A (en) | 2018-02-07 | 2018-02-07 | A kind of aluminum alloy cylinder cover oil passage sand core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810124624.2A CN108188340A (en) | 2018-02-07 | 2018-02-07 | A kind of aluminum alloy cylinder cover oil passage sand core |
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| Publication Number | Publication Date |
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| CN108188340A true CN108188340A (en) | 2018-06-22 |
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| CN201810124624.2A Pending CN108188340A (en) | 2018-02-07 | 2018-02-07 | A kind of aluminum alloy cylinder cover oil passage sand core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109290522A (en) * | 2018-10-23 | 2019-02-01 | 合肥江淮铸造有限责任公司 | A kind of back oil road sand core of engine cylinder body casting |
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Application publication date: 20180622 |