CN106238673B - A kind of forming method of the low-density EPS apperance for lost foam casting - Google Patents
A kind of forming method of the low-density EPS apperance for lost foam casting Download PDFInfo
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- CN106238673B CN106238673B CN201610834501.9A CN201610834501A CN106238673B CN 106238673 B CN106238673 B CN 106238673B CN 201610834501 A CN201610834501 A CN 201610834501A CN 106238673 B CN106238673 B CN 106238673B
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- apperance
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- foam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
Abstract
The invention discloses a kind of forming method of low-density EPS apperance for lost foam casting, EPS bead steam pressure be 0.015~0.03MPa, at 90~98 DEG C of temperature after prefoam through first time shaping foam；Then cured again at 50~60 DEG C；The EPS apperance of the lost foam casting of low-density is finally obtained through first time shaping foam again.In the present invention, pass through each step and its Collaborative Control of parameter, the density (bulk density) of polystyrene foam obtained (EPS apperance) can be effectively reduced, to which EPS be effectively reduced in the gas production of lost foam casting process, carbon defects, stomata and the molten iron cooling for reducing casting, improve the product quality of the casting of technique of founding casing with vacuum.
Description
Technical field:
The invention belongs to Technology of EPC fields, and in particular to a kind of low-density EPS mould for lost foam casting
The forming method of sample.
Background technique:
Lost foam casting is also known as dry sand or vacuum full mold casting, passes through prefoam, curing, hair using expandability foam beads
Type is soaked, produces Foam Pattern similar with cast shape, size, and is made by either manually or mechanically bonding complex-shaped
Foam Pattern or apperance cluster.It after Foam Pattern or apperance cluster are coated with fireproof coating and are dried, is put into sandbox, filling is without viscous
The dry sand for tying agent, by shaking and applying the method for negative pressure for dry sand consolidation into casting mold.The molten metal handled well is poured into casting
Type, the molten metal that Foam Pattern encounters high temperature softens rapidly, melts, decomposition of gasifying, and then decomposition product is logical under the action of negative pressure
Coating is crossed to be discharged in casting mold.Molten metal is filled with casting mold, fully takes up the position of original plastics apperance, after solidification is cooling, forms institute
The casting needed.
The mold filling and solidification processes of evaporative pattern are not only related to the success or failure of casting forming, also have emphatically to the inherent quality of casting
It influences, for example the defects of carburetting common in production, elephant skin, slag stomata, misrun, casting mold collapse is all often in casting filling
It is formed during type
EPS (expandable polystyrene) is the apperance for founding casing with vacuum, is gasified in the case of a high temperature, benefit
Generated gas is discharged with the form vacuumized, its position is substituted by molten iron and forms product.For a long time due to gasifying not
Complete or be vented it is unsmooth cause product to generate a large amount of carbon defects, reduce the gas forming amount of apperance and gasification product be lost foam
The target that casting technique is pursued reduces the pre- hair density of EPS under normal conditions, then leads to apperance surface quality difference or can not be at
Type, therefore the pre- hair density domination of manufacturer for a long time is even higher in 20g/l or so.
Summary of the invention:
Casting product quality is unstable etc. caused by density to solve the EPS apperance of existing lost foam casting is high asks
Topic, the present invention provides a kind of forming methods of low-density EPS apperance for lost foam casting, it is intended to by foam process
Adjustment, reduce EPS compact density while also there is good molding effect, and then reach reduce gas forming amount and reduce
The purpose of casting carbon defects raising product quality.
A kind of forming method of the low-density EPS apperance for lost foam casting, comprising the following steps:
Step (1): prefoam:
EPS bead steam pressure be 0.015~0.03MPa, prefoam at 90~98 DEG C of temperature；
Step (2): first time shaping foam:
By the EPS bead after step (1) prefoam in compressed air pressure >=0.5MPa, steam pressure >=0.6MPa, water
First time shaping foam is carried out under pressure >=0.25MPa；
Step (3): curing:
The shaping foam product that step (2) is obtained is cured at 50~60 DEG C；
Step (4): second of shaping foam:
Step (3) cooked product is inserted in mold, is carried out under conditions of the first time shaping foam of step (2) second
Shaping foam obtains the EPS apperance of low-density.
In the present invention, by the control of the Parameter Conditions of the prefoam and other each steps of coordinated and parameter,
The density (bulk density) for the EPS apperance that molding obtains can be effectively reduced, improve EPS apperance intensity, and then EPS apperance is effectively reduced and exists
The gas production of lost foam casting process reduces the carbon defects and stomata of casting, improves the casting of technique of founding casing with vacuum
Product quality.
The steam pressure and temperature and foamed time of prefoam process have certain shadow to the capacity of the EPS after prefoam
Ring, preferably, in step (1), EPS bead steam pressure be 0.015~0.03MPa, prefoam at 95~98 DEG C of temperature.
The vapour pressure and at a temperature of carry out prefoam, preferably, in step (1), pre-expansion time 50-60
Second.
The inventors discovered that the time described in prefoam under the temperature, vapour pressure, facilitates obtained capacity and compares
Apperance ideal, of good performance.
The prefoam under the conditions of prefoam of the step (1), the coefficient of foaming of EPS bead are 8-10.
The prefoam under the conditions of prefoam of the step (1), preferably, the EPS pearl in step (1), after prefoam
The density of grain is 16g/L and following.
Further preferably, in step (1), the density of the EPS bead after prefoam is 14-16g/L.
The density of the EPS bead of prefoam is controlled in the preferred range, molding can be further helped in and obtained
EPS apperance.
In prefoam, the partial size of EPS bead has centainly the capacity of obtained prefoam bead and subsequent molding
It influences；Preferably, the partial size of the EPS bead is 0.3-1.4mm in step (1).
Preferably, the diameter of the bead after prefoam is less than or equal to second of EPS mould after molding in step (1)
The 1/3 of sample wall thickness.
Preferably, the wall thickness of second of EPS apperance after molding is not less than 10mm, the granularity of EPS bead is 0.9-
1.4mm.For example, the EPS bead before prefoam uses Dragon King's board H-SA (d:0.9-1.4mm) of existing commercialization in step (1).
Preferably, the wall thickness of second of EPS apperance after molding is less than 10mm, the granularity of EPS bead is 0.3-
0.4mm.For example, the EPS bead is dealt out the cards 401 (d:0.3-0.4mm) using the tin of existing commercialization.
With the variation of expansion density, the diameter of original bead of the same race and then changes.Under the wall thickness and EPS bead
Prefoam is carried out, is conducive to utmostly reduce density.
Preferably, in step (2), in first time shaping foam, 0.5~0.7MPa of compressed air pressure, steam pressure
0.6~0.8MPa, 0.25~0.35MPa of hydraulic pressure.
Above-mentioned preferred first time shaping foam parameter carries out preferably in molding machine.In addition, first time of the invention at
Type foaming can also carry out in digester (-tor), preferably, controlling the digester (-tor) pressure is 0.1-0.15MPa.
Preferably, the temperature of first time shaping foam is 100~120 DEG C in step (2).
Preferably, the time of first time shaping foam is 8-12 seconds in step (2).
It is handled 8-12 seconds (at temperature and vapour pressure) under the first time shaping foam parameter, helps to obtain intensity
Preferable molding EPS apperance for the first time, and can avoid pattern shrinking.
Preferably, the curing time is not less than 4 hours in step (3).
In step (3), facilitate the molding of EPS under the curing temperature；Further preferably, in step (3), curing
Time is 4~8 hours.
In the preferred curing temperature and under the time, helps that moisture content is further dried and then help to reduce density
In the case where improve mold strength, maintain the form and foam structure of molding obtained EPS apperance for the first time.
After step (3) processing, the post forming of step (4) is carried out, further improves EPS apperance pattern obtained.Step
(4) second of shaping foam is identical with the condition of the first time shaping foam of step (2).
Second of shaping foam process of step (4) is in compressed air pressure >=0.5MPa, steam pressure >=0.6MPa, water
It is carried out under pressure >=0.25MPa；Wherein, the temperature of second of shaping foam is 100~120 DEG C；Time is 8-12 seconds.
A kind of forming method for the low-density EPS apperance being preferably used in lost foam casting, comprising the following steps:
Step (a): prefoam:
1.1 adjusting process parameters: it is required that compressed air pressure >=0.4MPa, System steam pressure >=0.5MPa；
1.2 pairs of equipment preheat, and preheating time is no less than 10 minutes, guarantee in cylinder and cylinder that room temperature is balanced and without product
Water；
Pre- 90~98 DEG C of the temperature within the barrel of hair of 1.3 settings, 0.015~0.03MPa of steam pressure, discharging time are set as 50-
60 seconds；
1.4 open machine, when the temperature in the pre- hair bucket of setting reaches setting value, open feed opening and add EPS bead；
The partial size of EPS bead can be selected according to the wall thickness of molding EPS apperance；The wall thickness of EPS apperance after molding is not less than 10mm,
The granularity of EPS bead is 0.9-1.4mm；The wall thickness of EPS apperance after molding is less than 10mm, and the granularity of EPS bead is 0.3-
0.4mm；
1.5EPS bead is sent out in bucket prefoam 50-60 seconds in advance under conditions of 1.3；When EPS bead reaches level-sensing device or sets
When determining density line (14-16g/L), discharge valve automatic discharging；
1.6 open the drying valve of material bed, dry to the EPS bead bead after pre- hair；
1.7 discharge ports start to start feed device when discharging and material are sent into tube for feed；
Step (b): first time shaping foam:
2.1 each technological parameters of adjustment, in first time shaping foam, 0.5~0.7MPa of compressed air pressure, steam pressure machine
Make 0.6~0.8MPa, 0.25~0.35MPa of hydraulic pressure；Temperature is 100-120 DEG C.
2.2 press start button, and the time of first time shaping foam is 8-12 seconds；Apperance is taken out after automatic die sinking；
Step (c): curing:
The apperance of first time shaping foam is transferred in bakery and carries out curing baking, 50~60 DEG C of baking temperature, curing
Time is not less than 4 hours；
Step (d): second of shaping foam:
The apperance cured is inserted in mold, is controlled by the technological parameter of first time shaping foam, second of molding
The time of foaming is 8-12 seconds；Finally obtain the EPS apperance (eps foam) of low-density.
Preparation process of the invention uses existing equipment, such as vertical pre-foaming machine, molding machine.
Product made from the method for the present invention is under the premise of guaranteeing apperance appearance quality, by the adjustment to moulding process,
The quality that the density of EPS apperance is reduced to reduce production cost, improve product, specifically has the advantage that
1, the module of low-density can be obtained, the gas forming amount of EPS apperance is reduced and reduces the carbon defects of casting.
2, by repeatedly foaming, the content of foaming agent is greatly lowered, the dimensionally stable of module.
3, the post forming foam process through the invention, can be high-quality compared with EPS apperance is obtained under case of low density case
The appearance quality of amount.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
Embodiment 1:
Step (1): prefoam:
1.1 adjusting process parameters: it is required that compressed air pressure >=0.4MPa, System steam pressure >=0.5MPa.
1.2 pairs of equipment preheat, and preheating time is no less than 10 minutes, guarantee in cylinder and cylinder that room temperature is balanced and without product
Water.
The technological parameters such as the pre- hair temperature within the barrel of 1.3 settings, steam pressure, discharging time.Steam pressure is in 0.015MPa, in advance
Send out 90 DEG C of temperature in bucket.
1.4 open machine, when the temperature in the pre- hair bucket of setting reaches setting value, open feed opening feed opening and add EPS
Bead (Dragon King board H-SA)；The EPS bead original particle size is 0.9-1.4mm.
1.5 pre- hair bucket times were 50-60 seconds；Discharge valve automatic discharging.
1.6 open the drying valve of material bed, dry to the bead after pre- hair.
1.7 discharge ports start to start feed device when discharging and material are sent into tube for feed.
Step (2): first time shaping foam:
2.1 each technological parameters of adjustment, compressed air pressure 0.5MPa, steam pressure 0.6MPa；Hydraulic pressure 0.25MPa；Temperature
It is 100 DEG C.
2.2 press start button, and the bead after pre- hair carries out first time shaping foam under the Parameter Conditions of step 2.1, when
Between be 8-12 seconds；Apperance is taken out after automatic die sinking.
Step (3): curing:
The apperance of first time shaping foam is transferred in bakery and carries out curing baking, 50 DEG C of baking temperature, curing time 4
Hour.
Step (4): second of shaping foam:
The apperance cured is inserted in mold, is carried out second by the technological parameter (step 2.1) of first time shaping foam
Shaping foam, time are 8-12 seconds；Finally obtain EPS apperance.
The capacity of EPS apperance obtained is 14g/L.
Embodiment 2
Step (1): prefoam:
1.1 adjusting process parameters: it is required that compressed air pressure >=0.4MPa, System steam pressure >=0.5MPa.
1.2 pairs of equipment preheat, and preheating time is no less than 10 minutes, guarantee in cylinder and cylinder that room temperature is balanced and without product
Water.
The technological parameters such as the pre- hair temperature within the barrel of 1.3 settings, steam pressure, discharging time.Steam pressure is in 0.02MPa, in advance
Send out 95 DEG C of temperature in bucket.
1.4 open machine, when the temperature in the pre- hair bucket of setting reaches setting value, open feed opening feed opening and add EPS
Bead (Dragon King board H-SA)；The EPS bead original particle size is 0.9-1.4mm.
1.5 pre- hair bucket times were 50-60 seconds；Discharge valve automatic discharging.
1.6 open the drying valve of material bed, dry to the bead after pre- hair.
1.7 discharge ports start to start feed device when discharging and material are sent into tube for feed.
Step (2): first time shaping foam:
2.1 each technological parameters of adjustment, compressed air pressure 0.6MPa, steam pressure 0.7MPa；Hydraulic pressure 0.3MPa；Temperature is
110℃。
2.2 press start button, and the bead after pre- hair carries out first time shaping foam under the Parameter Conditions of step 2.1, when
Between be 8-12 seconds；Apperance is taken out after automatic die sinking.
Step (3): curing:
The apperance of first time shaping foam is transferred in bakery and carries out curing baking, 50 DEG C of baking temperature, curing time 4
Hour.
Step (4): second of shaping foam:
The apperance cured is inserted in mold, is carried out second by the technological parameter (step 2.1) of first time shaping foam
Shaping foam, time are 8-12 seconds；Finally obtain EPS apperance.
The capacity of EPS apperance obtained is 15g/L.
Embodiment 3
Step (1): prefoam:
1.1 adjusting process parameters: it is required that compressed air pressure >=0.4MPa, System steam pressure >=0.5MPa.
1.2 pairs of equipment preheat, and preheating time is no less than 10 minutes, guarantee in cylinder and cylinder that room temperature is balanced and without product
Water.
The technological parameters such as the pre- hair temperature within the barrel of 1.3 settings, steam pressure, discharging time.Steam pressure is in 0.03MPa, in advance
Send out 98 DEG C of temperature in bucket.
1.4 open machine, when the temperature in the pre- hair bucket of setting reaches setting value, open feed opening feed opening and add EPS
Bead (tin deal out the cards 401), the EPS bead original particle size are 0.3-0.4mm.
1.5 pre- hair bucket times were 50-60 seconds；Discharge valve automatic discharging.
1.6 open the drying valve of material bed, dry to the bead after pre- hair.
1.7 discharge ports start to start feed device when discharging and material are sent into tube for feed.
Step (2): first time shaping foam:
2.1 each technological parameters of adjustment, compressed air pressure 0.7MPa, steam pressure 0.8MPa；Hydraulic pressure 0.35MPa；Temperature
It is 100 DEG C.
2.2 press start button, and the bead after pre- hair carries out first time shaping foam under the Parameter Conditions of step 2.1, when
Between be 8-12 seconds；Apperance is taken out after automatic die sinking.
Step (3): curing:
The apperance of first time shaping foam is transferred in bakery and carries out curing baking, 60 DEG C of baking temperature, curing time 8
Hour.
Step (4): second of shaping foam:
The apperance cured is inserted in mold, is carried out second by the technological parameter (step 2.1) of first time shaping foam
Shaping foam, time are 8-12 seconds；Finally obtain EPS apperance.
The capacity of EPS apperance obtained is 16g/L.
The EPS apperance surface capacity produced in above-described embodiment is smaller, is suitable for lost foam casting.
Claims (5)
1. a kind of forming method of the low-density EPS apperance for lost foam casting, which comprises the following steps:
Step (1): prefoam:
EPS bead is 0.015~0.03MPa, prefoam 50-60 seconds at 90~98 DEG C of temperature in steam pressure；After prefoam
The density of EPS bead is 16g/L and following；
Step (2): first time shaping foam:
By the EPS bead after step (1) prefoam in 0.5~0.7MPa of compressed air pressure, 0.6~0.8MPa of steam pressure,
0.25~0.35MPa of hydraulic pressure, it carries out first time shaping foam 8-12 seconds at 100~120 DEG C；
Step (3): curing:
The shaping foam product that step (2) is obtained is cured at 50~60 DEG C；
Step (4): second of shaping foam:
Step (3) cooked product is inserted in mold, second is carried out under conditions of the first time shaping foam of step (2) and is formed
Foaming, obtains the EPS apperance of low-density.
2. the forming method for the low-density EPS apperance of lost foam casting as described in claim 1, which is characterized in that step
Suddenly in (1), the partial size of the EPS bead is 0.3-1.4mm.
3. the forming method for the low-density EPS apperance of lost foam casting as claimed in claim 2, which is characterized in that the
The wall thickness of EPS apperance after post forming is not less than 10mm, and the granularity of EPS bead is 0.9-1.4mm.
4. the forming method for the low-density EPS apperance of lost foam casting as claimed in claim 2, which is characterized in that the
The wall thickness of EPS apperance after post forming is less than 10mm, and the granularity of EPS bead is 0.3-0.4mm.
5. the forming method for the low-density EPS apperance of lost foam casting as described in claim 1, which is characterized in that step
Suddenly in (3), the curing time is not less than 4 hours.
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| CN107052243B (en) * | 2016-12-28 | 2019-02-15 | 桃江新兴管件有限责任公司 | A kind of cast iron lost foam casting process |
| CN107052227B (en) * | 2017-02-16 | 2019-02-22 | 桃江新兴管件有限责任公司 | A kind of thin-wall tube lost foam paint and its preparation method and application |
| CN107096878A (en) * | 2017-03-27 | 2017-08-29 | 六安市龙兴汽车零部件有限公司 | A kind of white mould raw material curing process method of evaporative pattern |
| CN107096877A (en) * | 2017-03-27 | 2017-08-29 | 六安市龙兴汽车零部件有限公司 | A kind of process for preventing white mould apperance incomplete |
| CN107650395A (en) * | 2017-09-21 | 2018-02-02 | 安徽工程大学 | A kind of FD disappearances template material preparation method and its obtained disappearance template material |
| CN112936706A (en) * | 2021-01-27 | 2021-06-11 | 芜湖冠锋模具塑料有限公司 | Lost foam plate production process using STMMA material |
| CN113680965B (en) * | 2021-08-24 | 2023-06-13 | 上海大跃塑料制品有限公司 | Preparation method of solid casting lost foam sheet material with mixed STMMA (styrene butadiene styrene) beads and EPS (expanded polystyrene) beads |
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| JPH06339746A (en) * | 1993-04-08 | 1994-12-13 | Hitachi Chem Co Ltd | Foamable resin composition, lost foam pattern and casting method |
| CN101524739A (en) * | 2009-04-03 | 2009-09-09 | 宁波通达精密铸造有限公司 | Precision-investment casting method |
| CN102554120B (en) * | 2012-03-02 | 2013-12-11 | 丽水市实达机械制造有限公司 | Process for preparing plastic foam pattern for lost foam casting |
| CN103372630B (en) * | 2012-04-25 | 2017-07-04 | 河北瑞丰动力缸体有限公司 | A kind of evaporative pattern production technology of engine cylinder-body |
| CN203171932U (en) * | 2013-04-10 | 2013-09-04 | 河北广兴机械科技有限公司 | Low density EPS (Expandable Polystyrene) foam foaming machine |
| CN103909218A (en) * | 2014-04-04 | 2014-07-09 | 含山县恒翔机械制造有限公司 | Casting method of clutch shell mold |
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