CN107671240A - A kind of full-sized car part lost-foam casting method - Google Patents
A kind of full-sized car part lost-foam casting method Download PDFInfo
- Publication number
- CN107671240A CN107671240A CN201710765579.4A CN201710765579A CN107671240A CN 107671240 A CN107671240 A CN 107671240A CN 201710765579 A CN201710765579 A CN 201710765579A CN 107671240 A CN107671240 A CN 107671240A
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- China
- Prior art keywords
- casting
- parts
- sand
- sandbox
- resin sand
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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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
A kind of full-sized car part lost-foam casting method, comprises the following steps：A. foamed polystyrene pattern is made according to cast shape, and fireproof coating is smeared in the outer surface of foamed polystyrene pattern；B. the foamed polystyrene pattern after coating is placed in sandbox, uses phenolic sand molding；Sandbox after moulding is placed in the resin sand jolt ramming in case on compaction device, is dried and is vacuumized；C. cast makes bubbles model gasification disappearance in sandbox form casting；After casting cooling, take out and carry out knockout and excision casting head of casting cleaning.D. the casting after peeling is placed in holding furnace and is warming up to more than 1050 DEG C, be incubated 10 hours, be cooled to room temperature, produce casting.Technique is simple, and casting forming degree is high, and precision is good, Glabrous thorn.
Description
Technical field
The present invention relates to auto parts casting field, more particularly to the method that auto parts utilize lost foam casting.
Background technology
Lost foam casting (also known as cavityless casting) is to bond the bubbles model similar to casting dimension shape to be combined into mould
Type cluster, after brushing fireproof coating and drying, vibration molding in drystone sand is embedded in, is poured into a mould under negative pressure, model is gasified, liquid
Metal occupies modal position, and the novel casting method of casting is formed after solidification cooling.Lost foam casting be it is a kind of almost without plus
Spare time measures, and the casting technique of energy precise forming.Cleaning, batch production are easily realized, is provided for the design of casting labyrinth
The sufficient free degree.
For auto parts because volume is big, External Shape is complicated, and casting difficulty is larger, resin sand and evaporative pattern in casting process
Type not consolidation, easily causes burr and stomata, the material requirement and fireproof coating for this large-scale responsible part resin sand
It is required that it is higher, have much room for improvement.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of technique is simple, casting forming degree is high, and precision is good, smooth
Carrot-free full-sized car part lost-foam casting method.
To realize the object of the invention, there is provided following technical scheme：A kind of full-sized car part lost-foam casting method, bag
Include following steps：
A. foamed polystyrene pattern is made according to cast shape, and fireproof coating is smeared in the outer surface of foamed polystyrene pattern；
B. the foamed polystyrene pattern after coating is placed in sandbox, uses phenolic sand molding；Sandbox after moulding is placed in compaction device
On by the resin sand jolt ramming in case, dry and simultaneously vacuumized；
C. cast makes bubbles model gasification disappearance in sandbox form casting；After casting cooling, take out and carry out knockout and excision casting
Dead head is cleared up.
D. the casting after peeling is placed in holding furnace and is warming up to more than 1050 DEG C, be incubated 10 hours, be cooled to room
Temperature, produce casting；
It is characterized in that：Sandbox includes top box, raising middle flask and nowel, and raising middle flask surrounding inwall is provided with a hang plate, four pieces of inclinations
Plate forms up big and down small gradual change square frame, and hang plate outer wall is provided with some pieces of triangle stiffener plates, the stiffener plate
The heat conduction of material and the coefficient of expansion are more than hang plate, place lost foam pattern on nowel plate body, have on lost foam pattern surface
There are blind hole, groove position to place core iron and filled with resin sand, foam runner is set up between lost foam pattern, then in sandbox
Resin sand is inside filled up, one layer of a diameter of 2 ~ 4mm metal ball is filled in the outermost layer of resin sand, strength is installed in lower box bottom
Magnet, cast gate is finally set.
Preferably, resin sand includes discarded old sand, polyvinyl alcohol and formaldehyde condensation products, furfuryl alcohol resin and drying
Agent, it is 87% that described discarded old sand, which accounts for resin sand gross mass percentage, and polyvinyl alcohol accounts for resin sand gross mass with formaldehyde condensation products
Percentage is 7%, and it is 2.5% that furfuryl alcohol resin, which accounts for resin sand gross mass percentage, and described calcium stearate accounts for resin sand gross mass hundred
Divide than being 3.5%, the discarded old sand is made up of mixture of the grit size for 80 mesh and 160 two kinds of specifications of mesh.
Preferably, fireproof coating is calculated including bauxite 40-50 parts, zirconium English powder 20-30 parts, kaolin according to the mass fraction
15-20 parts, schmigel 10-15 parts, granularity are 240-300 mesh, in addition to bentonite 8-12 parts, waterglass 7-10 parts, methyl-prop
E pioic acid methyl ester 4-6 parts, polyvinyl acetate emulsion 2-3 parts, polychloroprene latex 1-2 parts.
Beneficial effect of the present invention：The present invention in resin sand outer layer by setting magnetic force sand, due to raising middle flask in layer was poured
Inclined plane, and the absorption affinity of nowel magnet body makes resin sand more consolidation, effectively prevents crush, improves casting accuracy, and
By the improvement to resin sand and fireproof coating, the difficulty of casting is greatly reduced, improves cost rate.
Brief description of the drawings
Fig. 1 is the structural representation of the sandbox of the present invention.
Fig. 2 is the structural representation of top box in Fig. 1.
Embodiment
Embodiment 1：A kind of full-sized car part lost-foam casting method, comprises the following steps：
A. foamed polystyrene pattern is made according to cast shape, and fireproof coating is smeared in the outer surface of foamed polystyrene pattern；
B. the foamed polystyrene pattern after coating is placed in sandbox, uses phenolic sand molding；Sandbox after moulding is placed in compaction device
On by the resin sand jolt ramming in case, dry and simultaneously vacuumized；
C. cast makes bubbles model gasification disappearance in sandbox form casting；After casting cooling, take out and carry out knockout and excision casting
Dead head is cleared up.
D. the casting after peeling is placed in holding furnace and is warming up to more than 1050 DEG C, be incubated 10 hours, be cooled to room
Temperature, produce casting；
It is characterized in that：Sandbox includes top box, raising middle flask and nowel, and raising middle flask surrounding inwall is provided with a hang plate, four pieces of inclinations
Plate forms up big and down small gradual change square frame, and hang plate outer wall is provided with some pieces of triangle stiffener plates, the stiffener plate
The heat conduction of material and the coefficient of expansion are more than hang plate, place lost foam pattern on nowel plate body, have on lost foam pattern surface
There are blind hole, groove position to place core iron and filled with resin sand, foam runner is set up between lost foam pattern, then in sandbox
Resin sand is inside filled up, one layer of a diameter of 2 ~ 4mm metal ball is filled in the outermost layer of resin sand, strength is installed in lower box bottom
Magnet, cast gate is finally set.
Resin sand includes discarded old sand, polyvinyl alcohol and formaldehyde condensation products, furfuryl alcohol resin and drier, and described is useless
It is 87% to abandon old sand and account for resin sand gross mass percentage, and it is 7% that polyvinyl alcohol accounts for resin sand gross mass percentage with formaldehyde condensation products,
It is 2.5% that furfuryl alcohol resin, which accounts for resin sand gross mass percentage, and it is 3.5% that described calcium stearate, which accounts for resin sand gross mass percentage,
The discarded old sand is made up of mixture of the grit size for 80 mesh and 160 two kinds of specifications of mesh.
Fireproof coating is calculated including bauxite 40-50 parts, zirconium English powder 20-30 parts, kaolin 15-20 parts according to the mass fraction,
Schmigel 10-15 parts, granularity are 240-300 mesh, in addition to bentonite 8-12 parts, waterglass 7-10 parts, methyl methacrylate
4-6 parts, polyvinyl acetate emulsion 2-3 parts, polychloroprene latex 1-2 parts.
The sandbox includes top box 1, raising middle flask 2 and nowel 3, and top box 1 includes two horizontal square tubes 1.1 and two longitudinal square tubes
1.2 quadras being spliced into, the separating tube 1.3 that quadra is separated into some pieces of grids, be opened in horizontal square tube 1.1,
Longitudinal square tube 1.2 and the air-vent 1.4 of the bottom surface of separating tube 1.3, a diameter of 25 ~ 50mm of φ of air-vent 1.4, separating tube 1.3
Both ends connect with quadra, two horizontal square tubes 1.1 of quadra and the equal open-ended in both ends of two longitudinal square tubes 1.2；
The raising middle flask 2 includes the square frame with the size of top box 1 always that four sections of I-steel 2.1 surround, the vertical surface of I-steel 2.1
It is evenly equipped with air-vent 2.2；The nowel 3 includes substrate 3.1, is opened in the ventilative square hole 3.2 on the surface of substrate 3.1, the top box 1
L-type angle steel 4, L-type angle are welded with two horizontal square tubes 1.1 of quadra and the outboard sidewalls of two longitudinal square tubes 1.2
Several connection through holes 4.1, the connection through hole 4.1 and the I-steel of raising middle flask 2 are offered on the horizontal part of steel 4 along its length
For the through hole that the 2.1 square frame upper surfaces surrounded correspondingly open up by setting bolt 5 affixed, the surrounding of substrate 3.1 of nowel 3 is also right
Connection through hole is offered, connects through hole and the through hole on the corresponding square frame lower surface for being opened in the I-steel 2.1 of raising middle flask 2 and surrounding
It is fixedly connected by bolt 5.The surrounding inwall of raising middle flask 2 is provided with a hang plate 6, four blocks of hang plates 6 form it is up big and down small gradually
Become square frame, the outer wall of hang plate 6 is provided with some pieces of triangle stiffener plates 7, the heat conduction and expansion of the material of the stiffener plate 7
Coefficient is more than hang plate 6.
The angle of hang plate 6 and vertical direction is 5 ~ 15 °.Top box 1, raising middle flask 2, upset hanger is provided with nowel 3.It is horizontal
It is a height of 350mmX400mm of wide x square tube to square tube 1.1 and longitudinal square tube 1.2, wall thickness is 10 ~ 20mm.Separating tube 1.3 is
250 ~ φ of diameter phi 280mm pipe.
Hang plate is set in raising middle flask, is compressed resin sand by the control of constant slope real, key is utilized between material not
Same heat conduction and the coefficient of expansion, when carrying out pouring operation, triangle stiffener plate quick conductive is simultaneously collided, and hang plate is inside
Top is real, the generation of effectively prevent from casting a sword burr and stomata, improves product quality.
Claims (3)
1. a kind of full-sized car part lost-foam casting method, comprises the following steps：
A. foamed polystyrene pattern is made according to cast shape, and fireproof coating is smeared in the outer surface of foamed polystyrene pattern；
B. the foamed polystyrene pattern after coating is placed in sandbox, uses phenolic sand molding；Sandbox after moulding is placed in compaction device
On by the resin sand jolt ramming in case, dry and simultaneously vacuumized；
C. cast makes bubbles model gasification disappearance in sandbox form casting；After casting cooling, take out and carry out knockout and excision casting
Dead head is cleared up；
D. the casting after peeling is placed in holding furnace and is warming up to more than 1050 DEG C, be incubated 10 hours, be cooled to room temperature, i.e.,
Obtain casting；
It is characterized in that：Sandbox includes top box, raising middle flask and nowel, and raising middle flask surrounding inwall is provided with a hang plate, four pieces of inclinations
Plate forms up big and down small gradual change square frame, and hang plate outer wall is provided with some pieces of triangle stiffener plates, the stiffener plate
The heat conduction of material and the coefficient of expansion are more than hang plate, place lost foam pattern on nowel plate body, have on lost foam pattern surface
There are blind hole, groove position to place core iron and filled with resin sand, foam runner is set up between lost foam pattern, then in sandbox
Resin sand is inside filled up, one layer of a diameter of 2 ~ 4mm metal ball is filled in the outermost layer of resin sand, strength is installed in lower box bottom
Magnet, cast gate is finally set.
2. a kind of full-sized car part lost-foam casting method according to claim 1, it is characterised in that resin sand includes
There are discarded old sand, polyvinyl alcohol and formaldehyde condensation products, furfuryl alcohol resin and drier, described discarded old sand accounts for the total matter of resin sand
It is 87% to measure percentage, and it is 7% that polyvinyl alcohol accounts for resin sand gross mass percentage with formaldehyde condensation products, and it is total that furfuryl alcohol resin accounts for resin sand
Mass percent is 2.5%, and it is 3.5% that described calcium stearate, which accounts for resin sand gross mass percentage, and the discarded old sand is by sand grains
Granularity forms for the mixture of two kinds of specifications of 80 mesh and 160 mesh.
3. a kind of full-sized car part lost-foam casting method according to claim 1, it is characterised in that fireproof coating is pressed
Mass fraction, which calculates, includes bauxite 40-50 parts, zirconium English powder 20-30 parts, kaolin 15-20 parts, schmigel 10-15 parts, granularity
For 240-300 mesh, in addition to bentonite 8-12 parts, waterglass 7-10 parts, methyl methacrylate 4-6 parts, polyvinyl acetate breast
Liquid 2-3 parts, polychloroprene latex 1-2 parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710765579.4A CN107671240A (en) | 2017-08-30 | 2017-08-30 | A kind of full-sized car part lost-foam casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710765579.4A CN107671240A (en) | 2017-08-30 | 2017-08-30 | A kind of full-sized car part lost-foam casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107671240A true CN107671240A (en) | 2018-02-09 |
Family
ID=61134149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710765579.4A Pending CN107671240A (en) | 2017-08-30 | 2017-08-30 | A kind of full-sized car part lost-foam casting method |
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| Country | Link |
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| CN (1) | CN107671240A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175245A (en) * | 2018-10-25 | 2019-01-11 | 芜湖泓鹄材料技术有限公司 | The casting technique of Auto panel dies casting |
| CN109175269A (en) * | 2018-10-25 | 2019-01-11 | 芜湖泓鹄材料技术有限公司 | A kind of heavy castings molding flask structure |
| CN110394421A (en) * | 2019-07-03 | 2019-11-01 | 叶耀 | Sand casting mould is eaten in a kind of bonding compacting of desiccator |
| CN115592072A (en) * | 2022-12-13 | 2023-01-13 | 衡水中裕铁信装备工程有限公司（Cn） | Composite casting method of hinge beam casting |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2139309A1 (en) * | 1970-08-11 | 1972-02-17 | Toyota Jidosha Kogyo K K , Toyota (Japan) | Magnetic casting - esp of spheroidal graphite cast iron |
| CN101602094A (en) * | 2009-07-10 | 2009-12-16 | 童思艺 | Cast sand box and magnetic compact casting and molding method thereof |
| CN101607299A (en) * | 2009-07-17 | 2009-12-23 | 泊头市青峰机械有限公司 | The founding casing with vacuum formative method of large complicated foundry goods |
| CN102205395A (en) * | 2011-06-03 | 2011-10-05 | 中恒通(福建)机械制造有限公司 | Casting method based on vacuum sealed molding combined with lost foam casting |
| CN102335725A (en) * | 2011-11-03 | 2012-02-01 | 无锡欧亚精密冲压件有限公司 | Lost foam casting method for high-power motor cast iron base |
| CN102909314A (en) * | 2012-09-29 | 2013-02-06 | 温州市康霸洁具有限公司 | Resin sand |
| CN105983646A (en) * | 2015-01-30 | 2016-10-05 | 重庆广鼎道路设施有限公司 | Lost foam casting paint |
-
2017
- 2017-08-30 CN CN201710765579.4A patent/CN107671240A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2139309A1 (en) * | 1970-08-11 | 1972-02-17 | Toyota Jidosha Kogyo K K , Toyota (Japan) | Magnetic casting - esp of spheroidal graphite cast iron |
| CN101602094A (en) * | 2009-07-10 | 2009-12-16 | 童思艺 | Cast sand box and magnetic compact casting and molding method thereof |
| CN101607299A (en) * | 2009-07-17 | 2009-12-23 | 泊头市青峰机械有限公司 | The founding casing with vacuum formative method of large complicated foundry goods |
| CN102205395A (en) * | 2011-06-03 | 2011-10-05 | 中恒通(福建)机械制造有限公司 | Casting method based on vacuum sealed molding combined with lost foam casting |
| CN102335725A (en) * | 2011-11-03 | 2012-02-01 | 无锡欧亚精密冲压件有限公司 | Lost foam casting method for high-power motor cast iron base |
| CN102909314A (en) * | 2012-09-29 | 2013-02-06 | 温州市康霸洁具有限公司 | Resin sand |
| CN105983646A (en) * | 2015-01-30 | 2016-10-05 | 重庆广鼎道路设施有限公司 | Lost foam casting paint |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175245A (en) * | 2018-10-25 | 2019-01-11 | 芜湖泓鹄材料技术有限公司 | The casting technique of Auto panel dies casting |
| CN109175269A (en) * | 2018-10-25 | 2019-01-11 | 芜湖泓鹄材料技术有限公司 | A kind of heavy castings molding flask structure |
| CN109175269B (en) * | 2018-10-25 | 2020-11-13 | 芜湖泓鹄材料技术有限公司 | Large casting molding sand box structure |
| CN109175245B (en) * | 2018-10-25 | 2020-11-17 | 芜湖泓鹄材料技术有限公司 | Casting process of automobile body mould casting |
| CN110394421A (en) * | 2019-07-03 | 2019-11-01 | 叶耀 | Sand casting mould is eaten in a kind of bonding compacting of desiccator |
| CN115592072A (en) * | 2022-12-13 | 2023-01-13 | 衡水中裕铁信装备工程有限公司（Cn） | Composite casting method of hinge beam casting |
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| PB01 | Publication | ||
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Application publication date: 20180209 |