CN106238668A - Static press moulding cast shaping process produces the method for potassium steel creeper tread - Google Patents
Static press moulding cast shaping process produces the method for potassium steel creeper tread Download PDFInfo
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- CN106238668A CN106238668A CN201610704145.9A CN201610704145A CN106238668A CN 106238668 A CN106238668 A CN 106238668A CN 201610704145 A CN201610704145 A CN 201610704145A CN 106238668 A CN106238668 A CN 106238668A
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- sand
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- high density
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- bentonite
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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
- 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
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Abstract
The present invention relates to a kind of method that static press moulding cast shaping process produces potassium steel creeper tread, solve currently without the problem producing potassium steel creeper tread with static press moulding cast shaping process, comprise the following steps: raw material weighing high density green sand is prepared fluffing of moulding sand moulding-sand property detection model and prepared core mould assembling cast under air infiltration technique diverting type sandfilling sandbox multiple contact ftercompction sand mold molding molding venting；The present invention has played static press moulding sand casting forming mode production efficiency height, the compacting time is short, noise is little, sand hardness is uniform, foundry goods pattern draft is little, and the advantage that green sand low cost, raw material sources are wide, reclamation of return sand rate is high, environmental pollution is little, thus reach effect consistent inside and outside sand hardness.
Description
Technical field
The present invention relates to a kind of method that static press moulding cast shaping process produces potassium steel creeper tread.
Background technology
Use the static press moulding mode of production to produce ironcasting comparative maturity the most both at home and abroad, but produce cast steel and there is no maturation
Technique, and reliability of technology extreme difference, potassium steel creeper tread is as a kind of high-carbon, high alloy material, structure complexity and high-speed overload
The product of operating mode, its cast shaping process mainly has phenol resin sand shell mould (core) casting and model casting, and jarring formula is made
Type, air-impact molding and impeller ramming mode.Its basic procedure is by the sand mold prepared, shell mould (core) and shell, pours into a mould Gao Meng
Steel molten metal is shaped to potassium steel creeper tread.Phenol resin sand shell mould (core) casting has casting dimension accuracy height and surface quality
Good advantage, but phenol resin sand shell mould (core) surface cast paint to be applied, shell mould (core) heat cure energy consumption is high, and phenolic aldehyde tree
Fat binding agent abnormal smells from the patient when heat cure is big, phenol, formaldehyde diffusion during casting pouring, cause environmental pollution etc. problem, and exist
Production efficiency is low, production cost high problem；Although model casting moulding process also has the casting of same shell mould (core) casting and molding method
Part dimensional accuracy height and the good advantage of surface quality, be suitable for the production of carbon steel and other alloy steel casting, but to shrinkage coefficient
For the potassium steel material of bigger metallurgy characteristic, due to the characteristic that the linear shrinkage of investment casting shell material is little, shell is made to make a concession
Property be deteriorated, hinder the free shrink of foundry goods, cause foundry goods easily to crack.And shell is produced certain by shrinking of foundry goods
Stress, adds the deformation of shell, crackle and foundry goods runout and the overproof problem of casting dimension.In addition potassium steel creeper tread plate class knot
The casting manufacturability of structure is poor, crackle and shell deformation, crackle, and foundry goods runout and dimension overproof problem more serious.Simultaneously
Owing to shell is poorer than sand mold radiating condition, rate of cooling is little, easily form columnar grain during the crystallization of potassium steel molten metal, reduce
Potassium steel creeper tread mechanical property；And also exist that production efficiency is low, production cost is high and industrialized production difficulty is big too
Problem；Green sand jarring formula moulding sand mold casting moulding process has that production efficiency is higher, labor intensity is less, low cost
Advantage, but its compaction ratio pressure little, the hardness of sand mold is low and hardness is uneven, and the surface quality of sand mold is poor, when casting of molten metal,
Type wall is subjected to displacement, and causes sand mold to rise case and casting dimension swell, and produces weight and dimension overproof problem, and foundry goods is interior
Portion's tissue is the finest and close, and dimensional accuracy is low, surface quality is poor；Green sand air-impact molding sand casting forming technique, although belong to
Category in high pressure moulding molding, it may have the advantage that low cost, production efficiency are high, labor intensity is little, but exist and produce noise
Greatly, production environment is poor；Simultaneously because sand mold lacks compacting link, low away from the sand hardness of model, cause the useless type rate of sand mold
Height, sand hardness distribution is the most uneven.Green sand impeller ramming sand casting forming technique falls within high pressure moulding molding
Category, it may have the advantage of low cost, but production efficiency is low, production environment is poor, labor intensity is big, sand mold gives up type rate is high, sand
Type hardness tester distribution is the most uneven.
Summary of the invention
It is little, sand mold that the present invention solves current green sand jarring formula moulding sand mold casting molding mode compaction ratio pressure
Hardness is low, hardness is uneven, and the surface quality of sand mold is poor, and when pouring into a mould potassium steel molten metal, type wall produces displacement, causes sand mold to rise
The interior tissue of case and casting dimension swell, generation weight and dimension overproof, foundry goods is the finest and close, and dimensional accuracy is low, surface quality
Difference；Green sand impeller ramming sand casting forming mode production efficiency is low, production environment is poor, labor intensity is big, useless type rate
Height, and sand hardness skewness and green sand air-impact molding sand casting forming mode sand mold give up high the asking of type rate
Topic.
The present invention is realized by techniques below scheme:
A kind of static press moulding cast shaping process produces the method for potassium steel creeper tread, comprises the following steps:
It is accurate that raw material weighing high density green sand prepares fluffing of moulding sand moulding-sand property detection model
Gas is pricked in standby air infiltration technique diverting type sandfilling sandbox multiple contact ftercompction sand mold molding molding
Core mould assembling now is poured into a mould；
Wherein, the main technical requirements of each component of high density green sand:
The raw material of preparation is fresh sand, reuse old sand, bentonite, moulding sand binder；
A) fresh sand: quartz sand, granularity is 40/100 mesh, and grain type is circular or oval；
B) bentonite: artificial natridization's bentonite, granularity crosses 200 mesh >=90%, green compression strength >=120kPa；
C) reclaim old sand: without the metal sundries of foundry goods vent wire and bulk sand, give up fuse, water content control 1%～
The scope of 2%, temperature is less than 45 DEG C, and clay content is less than 10%；
D) moulding sand binder: JL-02F1Moulding sand binder
Be mainly composed of macromolecular colloid component, polysaccharide component, organic fiber matter, thermal sensitivity component pulverulent mixture be combined
Material, density ＜ 0.85g/cm3, pH value 8；
E) industry water: pH value ＜ 6；
High density green sand preparation technology and processing performance require:
A) high density green sand raw material charging sequence and technical recipe
Reuse old sand 93%～97%+ fresh sand 3%～7%+ bentonite 0.3%～0.6%+ moulding sand binder 0.25%～
The appropriate industry water of 0.6%+；
B) the high density green sand mulling time
It is dry mixed: 10s～20s, wet mixing: 90s～150s；
C) the processing performance requirement of high density green sand
Compact rate of molding: 42 ± 4%；Air penetrability: 150～300；Moisture: 2.5%～3.4%；Green compression strength: 70kPa～
130kPa；Clay content: 7.0%～10.0%；Effectively bentonite: 5.0%～7.0%；Burning decrement :≤4.5%.
During for cast-internal organizational requirements height, during lower core, place drainage screen and/or chill.
The present invention has played static press moulding sand casting forming mode production efficiency height, the compacting time is short, noise is little, sand mold
Hardness is uniform, foundry goods pattern draft is little, and green sand low cost, raw material sources are wide, reclamation of return sand rate is high, environment is dirty
Contaminate little advantage；Also possessed shell mould (core) casting and the advantage that model casting casting dimension accuracy is high, surface quality is good simultaneously；
Concentrate air-impact molding and the advantage of high pressure multiple contact moulding sand mold casting, overcome both deficiencies, existing air-impact molding
Pre-compacting effect, has again the multiple-contact supplementary compaction of high pressure, thus reaches effect consistent inside and outside sand hardness.
Detailed description of the invention
The present invention is a kind of method that static press moulding cast shaping process produces potassium steel creeper tread, comprises the following steps:
It is accurate that raw material weighing high density green sand prepares fluffing of moulding sand moulding-sand property detection model
Gas is pricked in standby air infiltration technique diverting type sandfilling sandbox multiple contact ftercompction sand mold molding molding
Core mould assembling now is poured into a mould；
Wherein, the main technical requirements of each component of high density green sand:
The green sand of the present invention is high density green sand (system sand), and the raw material of preparation is that fresh sand is (former
Sand), reuse old sand, bentonite, moulding sand binder etc..
A () fresh sand (roughing sand): quartz sand, granularity is 40/100 mesh, and grain type is circular or oval；
(b) bentonite: artificial natridization's bentonite, granularity (crossing 200 mesh) >=90%, green compression strength >=120kPa；
C () reclaims old sand: without the metal sundries such as foundry goods vent wire and bulk sand, useless fuse, water content general control exists
The scope of 1%～2%, temperature is less than 45 DEG C, and clay content is less than 10%；
(d) moulding sand binder: JL-02F1Moulding sand binder
Be mainly composed of macromolecular colloid component, polysaccharide component, organic fiber matter, thermal sensitivity component pulverulent mixture be combined
Material, density (g/cm3) ＜ 0.85, pH value 8；
(e) industry water: water is the bentonitic carrier of moistening, and sodium-ionized bentonite has certain requirement, pH value to the pH value of water
＜ 6.
3) high density green sand (system sand) preparation technology and processing performance requirement
(a) high density green sand (system sand) raw material charging sequence and technical recipe
Reuse old sand (93%～97%)+fresh sand (3%～7%)+bentonite (0.3%～0.6%)+moulding sand binder
(0.25%～0.6%)+industry water (in right amount).
(b) high density green sand mulling time
It is dry mixed: 10s～20s, wet mixing: 90s～150s.
The processing performance requirement of (c) high density green sand (system sand)
Compact rate of molding: (42 ± 4) %；Air penetrability: 150～300；Moisture: 2.5%～3.4%；Green compression strength: 70kPa～
130kPa；Clay content: 7.0%～10.0%；Effectively bentonite: 5.0%～7.0%；Burning decrement :≤4.5%.
Embodiment:
1, technical scheme
Technology path；
1) raw material weighing mulling (sand conditioning) fluffing of moulding sand (mixing well) moulding-sand property detection model
Prepare air infiltration technique diverting type sandfilling (pouring) sandbox multiple contact ftercompction sand mold molding (upper and lower case)
Core (placing drainage screen, chill) mould assembling cast under molding venting.
2) main technical requirements of high density green sand (system sand) each component:
The green sand of the present invention is high density green sand (system sand), and the raw material of preparation is that fresh sand is (former
Sand), reuse old sand, bentonite, moulding sand binder etc..
A () fresh sand (roughing sand): quartz sand, granularity is 40/100 mesh, and grain type is circular or oval；
(b) bentonite: artificial natridization's bentonite, granularity (crossing 200 mesh) >=90%, green compression strength >=120kPa；
C () reclaims old sand: without the metal sundries such as foundry goods vent wire and bulk sand, useless fuse, water content general control exists
The scope of 1%～2%, temperature is less than 45 DEG C, and clay content is less than 10%；
(d) moulding sand binder: JL-02F1Moulding sand binder
Be mainly composed of macromolecular colloid component, polysaccharide component, organic fiber matter, thermal sensitivity component pulverulent mixture be combined
Material, density (g/cm3) ＜ 0.85, pH value 8；
(e) industry water: water is the bentonitic carrier of moistening, and sodium-ionized bentonite has certain requirement, pH value to the pH value of water
＜ 6.
3) high density green sand (system sand) preparation technology and processing performance requirement
(a) high density green sand (system sand) raw material charging sequence and technical recipe
Reuse old sand (93%～97%)+fresh sand (3%～7%)+bentonite (0.3%～0.6%)+moulding sand binder
(0.25%～0.6%)+industry water (in right amount).
(b) high density green sand mulling time
It is dry mixed: 10s～20s, wet mixing: 90s～150s.
The processing performance requirement of (c) high density green sand (system sand)
Compact rate of molding: (42 ± 4) %；Air penetrability: 150～300；Moisture: 2.5%～3.4%；Green compression strength: 70kPa～
130kPa；Clay content: 7.0%～10.0%；Effectively bentonite: 5.0%～7.0%；Burning decrement :≤4.5%.
It is prepared as described above technique and prepared moulding sand high density green sand (system sand) is passed through Belt Conveying
Sand storage bin above Static Pressure Molding Machine is standby, and up time ordinary circumstance is less than 1h.In advance by potassium steel crawler belt template die
Type body forms complete upper and lower model in being assembled to template frame, is arranged on Static Pressure Molding Machine rotary table.Unlatching static pressure is made
Type machine, green sand dredged by air infiltration technique i.e. air draught path and led (punching) and enter in the airtight sandbox of surrounding, filling
Cover cast model.Sand grains is led (punching) with the pressure of air-flow and is entered sandbox, and air-flow is discharged along template venting plug, it is achieved that sand mold
The pre-compacting effect of air-flow, green sand (system sand) adds sand amount general control and is exceeding the height of sandbox 20mm～50mm,
The back side of sand mold is compacted by sensing multiple contact according to sand mold compaction ratio pressure (hardness) set by technique, when a certain sensing is touched
Head is automatically stopped compacting and rises after being compacted the compaction ratio pressure (hardness) that sand mold reaches set, the most set sand mold pressure
The induction contact of fullsized pressure (hardness) continues pressure, until it reaches set sand mold compaction ratio pressure (hardness) stops.Finally make
Sand mold each unit (position) reaches identical compaction ratio pressure (hardness), it is achieved that sand mold each unit (position) uniformity compaction ratio
Pressure (hardness) effect, after sand mold (upper and lower case) molding, be transported to core setter position venting, lower core (place drainage screen, chill),
Mould assembling, after sand mold mould assembling, the time to be poured typically allows less than 4h, pours into a mould potassium steel molten metal, be shaped to Gao Meng after sand mold mould assembling
Steel creeper tread foundry goods.
Generally, the compaction ratio pressure (hardness) of sensing multiple contact ftercompction sand mold sets 80GF～120GF, the height of production
The dimensional accuracy of manganese steel creeper tread foundry goods is CT6～CT8 level；Surface roughness are Ra12.5～Ra25 μm；Foundry goods is qualified
Rate is more than 95%.
The present invention solves: shell mould (core) casting shell (core) surface coating cast paint operation is many, shell mould (core) phenolic aldehyde
When heat cure, abnormal smells from the patient is big, energy consumption is high for resinoid bond, and phenol during casting pouring, formaldehyde diffusion, environmental pollution is big, produces effect
Rate is low, production cost high problem；Model casting is suitable for the production of carbon steel and other steel alloy non-board-(bar) class foundry goods, is not suitable for
The potassium steel material of the bigger metallurgy characteristic of shrinkage coefficient, produces bigger contraction in process of setting, due to shell material material
The restriction that linear shrinkage is less and shell deformability is poor, hinders the free shrink of foundry goods, causes shell deformation, crackle and foundry goods to run
Fire, makes foundry goods crack and dimension overproof problem, and the casting manufacturability of potassium steel creeper tread tabular class formation is poor in addition, foundry goods
Crack and shell deformation, crackle, and foundry goods are run away and dimension overproof more serious problems: simultaneously because the heat radiation of shell
Condition is poor, rate of cooling is little, and potassium steel creeper tread easily produces columnar grain, reduces mechanical property；And there is also too
Production efficiency is low, production cost is high, the big problem of industrialized production difficulty.
Meanwhile, instant invention overcomes green sand jarring formula moulding sand mold casting compaction ratio pressure little, sand hardness low and
Hardness is uneven, and mould surface is of poor quality, and when pouring into a mould potassium steel molten metal, type wall produces displacement, causes sand mold to rise case and foundry goods chi
Very little swell, generation weight and dimension overproof, the interior tissue of foundry goods is the finest and close, and dimensional accuracy is low, the poor problem of surface quality；Also gram
Taken that green sand impeller ramming sand casting forming mode production efficiency is low, production environment is poor, labor intensity is big, useless type rate
Height, and sand hardness skewness problem；Solve green sand air-impact molding sand casting forming mode sand mold simultaneously
Useless type rate high problem.
Castings production efficiency of the present invention improves 6～10 times than shell mould (core) casting and model casting；Production cost compares shell mould
(core) casting and model casting reduce by 3～5 times；And reduce labor intensity, improve production efficiency.
Claims (2)
1. the method that static press moulding cast shaping process produces potassium steel creeper tread, comprises the following steps:
It is accurate that raw material weighing high density green sand prepares fluffing of moulding sand moulding-sand property detection model
Gas is pricked in standby air infiltration technique diverting type sandfilling sandbox multiple contact ftercompction sand mold molding molding
Core mould assembling now is poured into a mould, and it is characterized in that:
Wherein, the main technical requirements of each component of high density green sand:
The raw material of preparation is fresh sand, reuse old sand, bentonite, moulding sand binder；
A) fresh sand: quartz sand, granularity is 40/100 mesh, and grain type is circular or oval；
B) bentonite: artificial natridization's bentonite, granularity crosses 200 mesh >=90%, green compression strength >=120kPa；
C) old sand is reclaimed: without metal sundries and bulk sand, the useless fuse of foundry goods vent wire, water content control is 1%～2%
Scope, temperature is less than 45 DEG C, and clay content is less than 10%；
D) moulding sand binder: JL-02F1Moulding sand binder
It is mainly composed of macromolecular colloid component, polysaccharide component, organic fiber matter, thermal sensitivity component pulverulent mixture composite wood
Material, density ＜ 0.85g/cm3, pH value 8；
E) industry water: pH value ＜ 6；
High density green sand preparation technology and processing performance require:
A) high density green sand raw material charging sequence and technical recipe
Reuse old sand 93%～97%+ fresh sand 3%～7%+ bentonite 0.3%～0.6%+ moulding sand binder 0.25%～
The appropriate industry water of 0.6%+；
B) the high density green sand mulling time
It is dry mixed: 10s～20s, wet mixing: 90s～150s；
C) the processing performance requirement of high density green sand
Compact rate of molding: 42 ± 4%；Air penetrability: 150～300；Moisture: 2.5%～3.4%；Green compression strength: 70kPa～130kPa；
Clay content: 7.0%～10.0%；Effectively bentonite: 5.0%～7.0%；Burning decrement :≤4.5%.
A kind of static press moulding cast shaping process the most according to claim 1 produces the method for potassium steel creeper tread, and it is special
Levy and be: during for cast-internal organizational requirements height, during lower core, place drainage screen and/or chill.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610704145.9A CN106238668A (en) | 2016-08-22 | 2016-08-22 | Static press moulding cast shaping process produces the method for potassium steel creeper tread |
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|---|---|---|---|
| CN201610704145.9A CN106238668A (en) | 2016-08-22 | 2016-08-22 | Static press moulding cast shaping process produces the method for potassium steel creeper tread |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108907090A (en) * | 2018-08-22 | 2018-11-30 | 内蒙古第机械集团股份有限公司 | A kind of casting technique of potassium steel creeper tread |
| CN111644577A (en) * | 2020-06-12 | 2020-09-11 | 内蒙古第一机械集团股份有限公司 | Casting method for moving wheel and fixed wheel of comprehensive transmission system of tracked vehicle |
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| JP5075902B2 (en) * | 2009-10-05 | 2012-11-21 | キンセイマテック株式会社 | Mold sand and its manufacturing method |
| CN103394671A (en) * | 2013-08-01 | 2013-11-20 | 河北海钺耐磨材料科技有限公司 | Preparation technology for lost foam casting high manganese steel wear-resisting surface composite materials |
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| CN86104963A (en) * | 1986-07-28 | 1987-06-10 | 机械工业部沈阳铸造研究所 | Cast steel, cast iron type (core) sand compound |
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| JP5075902B2 (en) * | 2009-10-05 | 2012-11-21 | キンセイマテック株式会社 | Mold sand and its manufacturing method |
| CN102166620A (en) * | 2010-11-30 | 2011-08-31 | 大连华锐股份有限公司 | Molding method of copper alloy propeller resin sand |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108907090A (en) * | 2018-08-22 | 2018-11-30 | 内蒙古第机械集团股份有限公司 | A kind of casting technique of potassium steel creeper tread |
| CN111644577A (en) * | 2020-06-12 | 2020-09-11 | 内蒙古第一机械集团股份有限公司 | Casting method for moving wheel and fixed wheel of comprehensive transmission system of tracked vehicle |
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