CN110252940A - A kind of casting core material and core-making method - Google Patents

A kind of casting core material and core-making method Download PDF

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Publication number
CN110252940A
CN110252940A CN201910603290.1A CN201910603290A CN110252940A CN 110252940 A CN110252940 A CN 110252940A CN 201910603290 A CN201910603290 A CN 201910603290A CN 110252940 A CN110252940 A CN 110252940A
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CN
China
Prior art keywords
core
casting
sand
shot
making
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
Application number
CN201910603290.1A
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Chinese (zh)
Inventor
李冠昕
杨天祥
陈晓群
许立玉
施闵雄
何金鹏
丁成才
马俊杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NINGBO YONGXIANG CASTING Co Ltd
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NINGBO YONGXIANG CASTING Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NINGBO YONGXIANG CASTING Co Ltd filed Critical NINGBO YONGXIANG CASTING Co Ltd
Priority to CN201910603290.1A priority Critical patent/CN110252940A/en
Publication of CN110252940A publication Critical patent/CN110252940A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/10Cores; Manufacture or installation of cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor

Abstract

The invention discloses a kind of casting core material, the weight percent composition of the coremaking material includes: shot 55~65%, carbon granules 15~25%, surplus is silica sand, wherein, the partial size of the shot is 0.5~1.5 mm, 1.0 mm of partial size < of the carbon granules.The replaceable tradition of casting core material of the present invention forms direct or indirect chill and uses, and the casting flaws such as shrinkage cavity and porosity for effectively eliminating casting, moulding difficulty is reduced, reduces cleaning and the polishing working hour of casting, hence it is evident that improve castings production efficiency and guarantee casting product quality.Casting core material of the present invention is particularly suitable for the casting more demanding to quality and is difficult to place or clear up the region of chill, pressure vessel or oily cylinder parts, side wall such as with guide pillar hole have the casting of elongated hole, casting flaw is effectively reduced or eliminated, product qualification rate is improved.The compression strength for the sand core that core-making method of the present invention obtains is 2.9 MPa or more, fully meets casting pouring needs.

Description

A kind of casting core material and core-making method
Technical field
The present invention relates to casting core field of material technology, specifically a kind of casting core material and core-making method.
Background technique
In cast casting production process, it is frequently encountered Shrinkage Porosity, shrinkage cavity phenomenon, especially some pressure vessels or oil Easily there is shrinkage porosite, shrinkage cavity defect in the close interstitial hole and sidewall locations of cylinder parts.Especially during casting oily cylinder parts, It for the stabilization for guaranteeing casting quality, selects to place contoured chill during coremaking, causes cleaning and polishing is difficult, and substantially increase Moulding difficulty is added.
Conventional casting methods application forms direct chill, and existing influence factor is more, is not easy to manage, and cannot disappear completely Except defect.As casting outer profile be arc surface or curved surface when, using ultrasonic wave (UT) carrying out flaw detection be not easy detect and find Defect, finally defect is exposed when processing, scraps part from using, causes increased costs, and the production cycle is long, can serious shadow It rings agreement and hands over the phase.
In addition, there is problems using contoured chill: 1, needing to make chill, increase production hour;2, cold The moulding of iron itself molding, casting, is unpacked, polishing higher cost;3, it saves contoured chill and needs a large amount of manpower and space; 4, gap must be stayed between contoured chill, consolidation does not make sand mo(u)ld intensity is low casting is caused to generate defect it is possible to generating plug sand; 5, in moulding because of increase when chill puts moulder caused by difficulty;6, contoured chill because polishing and deformation, cause with Mold fitting is not tight, and casting is caused to expect more or lack material.
Summary of the invention
The technical problem to be solved by the present invention is to, in view of the deficiencies of the prior art, provide a kind of casting core material and Core-making method, the coremaking material alternatively form direct or indirect chill and use, and save in Foundry Production to dedicated chill and cold The preservation and maintenance operation of swage tool, and the casting flaws such as shrinkage cavity and porosity for effectively eliminating casting, reduce moulding difficulty, reduce The cleaning of casting and polishing working hour, hence it is evident that improve castings production efficiency and guarantee casting product quality;What the core-making method obtained The compression strength of sand core is 2.9 MPa or more, fully meets casting pouring needs.
The technical scheme of the invention to solve the technical problem is: a kind of casting core material, the coremaking material Weight percent composition include: 55~65 % of shot, 15~25 % of carbon granules, surplus is silica sand, wherein the grain of the shot Diameter is 0.5~1.5 mm, 1.0 mm of partial size < of the carbon granules.
Casting core material of the present invention is made of shot, carbon granules and silica sand, which is a kind of iron sand.Carbon is casting The best material of middle heat-conducting effect, with product after coremaking material coremaking of the present invention in casting process, carbon can play conduction casting The effect of part heat;Shot also has certain chilling action, while can increase iron sand intensity.After casting, casting mold is full of molten iron, by To the chilling action of iron sand, achieve the effect that casting side wall while solidifying, substantially reduces and eliminate the shrinkage porosite of casting, shrinkage cavity lacks It falls into, improves casting quality, stabilized product quality.
The coremaking material can make at any time, without using contoured chill during coremaking, be avoided that and use contoured chill system Core taps the issuable misrun phenomenon of chill after unpacking, and is conducive to the coremaking efficiency and quality that improve sand core, and is somebody's turn to do after unpacking Coremaking material is recyclable to be recycled.For the iron powder amount loss for preventing reclaimed sand caused by iron sand knockout during coremaking, Ke Yidan Only selection region does knockout recycling.In casting process after coremaking, which can fit over cast(ing) surface completely, will not Burning into sand class defect caused by generating because of chill gap.
Casting core material of the present invention alternatively forms direct or indirect chill and uses, and saves in casting process to dedicated cold The preservation and maintenance operation of iron and chill mold, and the casting flaws such as shrinkage cavity and porosity for effectively eliminating casting, it is difficult to reduce moulding Degree reduces cleaning and the polishing working hour of casting, improves castings production efficiency and guarantee casting product quality.
Preferably, the shot is recovered from the waste and old shot generated after shot-blasting machine Shot Blasting, in the waste and old shot The weight accounting of the shot of 20~30 mesh is 55~65%;The silica sand is recovered from the old sand generated after shot-blasting machine Shot Blasting. Using waste and old shot and old sand as raw material sources, can further reduce the cost.By the weight of the shot of 20~30 mesh in waste and old shot Accounting is controlled 55~65%, it can be ensured that the compactness and intensity of the sand core of production, and guarantee the heat dissipation effect of casting after casting.
Further, the iron-content of the waste and old shot is 90~95 %.
Preferably, the carbon granules is sawdust, sawdust or carbon block particle.
More than one state the core-making method that casting core material is raw material, comprising the following steps:
(1) each raw material of coremaking material is added in sand mixer after mixing, after stirring, alkaline phenol formaldehyde tree is added Rouge stirs again as bonding agent, obtains deployed iron sand;
(2) arbor is placed in core box, offers multiple gas vents on the side wall of the arbor in advance, according to cast shape, in core Deployed iron sand and tamping are filled around bone;
(3) CO is persistently inputted to multiple gas vents through transmitting catheter2Gas makes the iron sand hardening of filling, obtains sand core semi-finished product;
(4) after the water paint of 0.5~2.0 mm thickness of sand core surface of semi-finished brushing, sand core semi-finished product are put into baking oven It is interior, it at a temperature of heat preservation 2~4 h drying lower than 200 DEG C, or places 24 hours and spontaneously dries, that is, complete sand core, standby With.
In core-making method step (3) of the present invention, CO is persistently inputted to multiple gas vents2The effect of gas is to make CO2Gas It penetrates into iron sand and comes into full contact with iron sand and reacted with alkalescent phenol resin, to make iron sand quick-hardening.Coremaking side of the present invention The compression strength for the sand core that method obtains is 2.9 MPa or more, fully meets casting pouring needs.
After prepared sand core molding, in casting process, iron sand makes the uniform Quench of casting, while the carbon contained in sand core Grain is converted into CO at high temperature2Gas and through row of exhausting-gas hole depanning outside, increase casting heat dissipation effect.
Preferably, the alkalescent phenol resin of addition and the volume ratio of coremaking material are 1.0~1.5:20 in step (1). Control the iron sand neutral and alkali phenolic resin of allotment and the volume ratio of coremaking material, it is ensured that the adhesive effect of coremaking material, really Protect iron sand compression strength.
Preferably, in step (2), the iron sand filled between the lateral surface of arbor and the medial surface of core box with a thickness of 30 ~60 mm.It is of different sizes according to core box, guarantee the iron sand for there are 30~60 mm between the lateral surface of arbor and the medial surface of core box Mold thickness can guarantee the intensity of iron sand and the integrality of sand core, it is ensured that the quality of successive castings.
Preferably, in step (2), 10 mm of aperture > of the gas vent opened up on the side wall of arbor, to ensure CO2's Inflate effect.
Preferably, exhaust pipe, more rows are inserted on multiple gas vents on the side wall of arbor respectively in step (2) Stomata is offered on tracheae respectively, the outer end of more exhaust pipes is embedded in iron sand respectively.Exhaust pipe can make CO2Gas is fully infiltrated into In iron sand, make CO2Gas and iron sand have enough contacts area.
Preferably, in step (3), CO2Gas continuous input time is 5~20 minutes, to guarantee inflation reaction effect Fruit.
Compared with prior art, the present invention has the advantage that casting core material disclosed by the invention, by shot, carbon Grain and silica sand composition, which is a kind of iron sand.The coremaking material alternatively forms direct or indirect chill and uses, and saves The preservation and maintenance of dedicated chill and chill mold are operated in Foundry Production, and shrinkage cavity and porosity for effectively eliminating casting etc. is cast Defect is made, moulding difficulty is reduced, reduces cleaning and the polishing working hour of casting, hence it is evident that improves castings production efficiency and guarantees that casting produces Quality.Casting core material of the present invention is particularly suitable for the casting more demanding to quality and is difficult to place or clear up chill Region, such as the pressure vessel with guide pillar hole or oily cylinder parts, side wall have the casting of elongated hole, effectively reduces or disappears Except casting flaw, product qualification rate is improved.The compression strength for the sand core that core-making method of the present invention obtains is 2.9 MPa or more, complete Full up foot casting pouring needs.
Detailed description of the invention
Fig. 1 is a kind of structure sectional view of the sand core of the existing oil cylinder obtained using the core-making method of embodiment 3.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
The weight percent composition of the casting core material of embodiment 1 includes: 60 % of shot, 20 % of carbon granules, the present embodiment In using sawdust as carbon granules, surplus is silica sand, wherein the partial size of shot be 0.5~1.5 mm, 1.0 mm of partial size < of carbon granules.Steel Ball is recovered from the waste and old shot generated after shot-blasting machine Shot Blasting, and the iron-content of waste and old shot is 92 %, and silica sand is recovered from ball blast The old sand generated after machine Shot Blasting.
The weight percent composition of the casting core material of embodiment 2 includes: 55 % of shot, 25 % of carbon granules, the present embodiment In using carbon block particle as carbon granules, surplus is silica sand, wherein the partial size of shot be 0.5~1.5 mm, the partial size < 1.0 of carbon granules mm.Shot is recovered from the waste and old shot generated after shot-blasting machine Shot Blasting, and the iron-content of waste and old shot is 95 %, in waste and old shot The weight accounting of the shot of 20~30 mesh is 55~65%;Silica sand is recovered from the old sand generated after shot-blasting machine Shot Blasting.
Embodiment 3, using the casting core material of embodiment 1 as the core-making method of raw material, comprising the following steps:
(1) each raw material of coremaking material is added in sand mixer after mixing, after stirring, alkaline phenol formaldehyde tree is added For rouge as bonding agent, the alkalescent phenol resin of addition and the volume ratio of coremaking material are 1.0:20, stir, obtain again To deployed iron sand;
(2) arbor is placed in core box, offers the gas vent of multiple 10 mm of aperture > on the side wall of the arbor in advance, according to Cast shape is filled deployed iron sand and tamping around arbor, is filled between the lateral surface of arbor and the medial surface of core box Iron sand with a thickness of 35 mm;
(3) CO is persistently inputted to multiple gas vents through transmitting catheter2Gas 10 minutes, makes the iron sand hardening of filling, obtain sand core Semi-finished product;
(4) after the graphite system water paint of 0.5~1.0 mm thickness of sand core surface of semi-finished brushing, sand core semi-finished product are put into In baking oven, lower than 200 DEG C at a temperature of keep the temperature 3 h drying, that is, the sand core of 2.9 MPa or more of the compression strength that completes is standby With.
Now by taking a kind of existing oil cylinder as an example, the structure sectional view of the sand core obtained using the core-making method of embodiment 3 is shown in figure 1.In Fig. 1,1 is iron sand, and 2 be arbor, and 3 be the gas vent on arbor, and 4 be type chamber (i.e. casting mold), and 5 be core print.After casting, type chamber Molten iron is full of in 4, by the chilling action of iron sand 1, casting side wall achievees the effect that while solidifying, after casting cooled and solidified to obtain the final product To oil cylinder casting.The casting flaws such as the shrinkage cavity and porosity of the oil cylinder casting are effectively eliminated, high-quality.
Embodiment 4, using the casting core material of embodiment 2 as the core-making method of raw material, comprising the following steps:
(1) each raw material of coremaking material is added in sand mixer after mixing, after stirring, alkaline phenol formaldehyde tree is added For rouge as bonding agent, the alkalescent phenol resin of addition and the volume ratio of coremaking material are 1.5:20, stir, obtain again To deployed iron sand;
(2) arbor is placed in core box, offers the gas vent of multiple 10 mm of aperture > on the side wall of the arbor in advance, it is multiple Exhaust pipe is inserted on gas vent respectively, offers stomata on more exhaust pipes respectively, the outer end of more exhaust pipes is embedded to respectively In iron sand;According to cast shape, deployed iron sand and tamping, the lateral surface of arbor and the inside of core box are filled around arbor The iron sand filled between face with a thickness of 60 mm;
(3) CO is persistently inputted to multiple gas vents through transmitting catheter2Gas 20 minutes, makes the iron sand hardening of filling, obtain sand core Semi-finished product;
(4) it after the graphite system water paint of 1.0~2.0 mm thickness of sand core surface of semi-finished brushing, places 24 hours and does naturally Dry, that is, the sand core of 2.9 MPa or more of the compression strength that completes is spare.

Claims (10)

1. a kind of casting core material, which is characterized in that the weight percent composition of the coremaking material includes: shot 55~65 %, 15~25 % of carbon granules, surplus is silica sand, wherein the partial size of the shot is 0.5~1.5 mm, the partial size of the carbon granules 1.0 mm of <.
2. a kind of casting core material according to claim 1, which is characterized in that the shot is recovered from shot-blasting machine throwing The waste and old shot that generates after ball processing, the weight accounting of the shot of 20~30 mesh is 55~65% in the waste and old shot;The silicon Sand is recovered from the old sand generated after shot-blasting machine Shot Blasting.
3. a kind of casting core material according to claim 2, which is characterized in that the iron-content of the waste and old shot is 90~95 %.
4. a kind of casting core material according to claim 1, which is characterized in that the carbon granules be sawdust, sawdust or Carbon block particle.
5. a kind of using casting core material of any of claims 1-4 as the core-making method of raw material, which is characterized in that The following steps are included:
(1) each raw material of coremaking material is added in sand mixer after mixing, after stirring, alkaline phenol formaldehyde tree is added Rouge stirs again as bonding agent, obtains deployed iron sand;
(2) arbor is placed in core box, offers multiple gas vents on the side wall of the arbor in advance, according to cast shape, in core Deployed iron sand and tamping are filled around bone;
(3) CO is persistently inputted to multiple gas vents through transmitting catheter2Gas makes the iron sand hardening of filling, obtains sand core semi-finished product;
(4) after the water paint of 0.5~2.0 mm thickness of sand core surface of semi-finished brushing, sand core semi-finished product are put into baking oven It is interior, it at a temperature of heat preservation 2~4 h drying lower than 200 DEG C, or places 24 hours and spontaneously dries, that is, complete sand core, standby With.
6. core-making method according to claim 5, which is characterized in that in step (1), the alkalescent phenol resin and system of addition The volume ratio of core material is 1.0~1.5:20.
7. core-making method according to claim 5, which is characterized in that in step (2), the lateral surface of arbor and core box it is interior The iron sand filled between side with a thickness of 30~60 mm.
8. core-making method according to claim 5, which is characterized in that in step (2), the exhaust that is opened up on the side wall of arbor 10 mm of aperture > in hole.
9. core-making method according to claim 5, which is characterized in that multiple exhausts in step (2), on the side wall of arbor Exhaust pipe is inserted on hole respectively, offers stomata on more exhaust pipes respectively, the outer end of more exhaust pipes is embedded to iron sand respectively It is interior.
10. core-making method according to claim 5, which is characterized in that in step (3), CO2Gas continuous input time is 5 ~20 minutes.
CN201910603290.1A 2019-07-05 2019-07-05 A kind of casting core material and core-making method Pending CN110252940A (en)

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