CN109530612A - A kind of lost foam casting process suitable for large and medium-sized product - Google Patents
A kind of lost foam casting process suitable for large and medium-sized product Download PDFInfo
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- CN109530612A CN109530612A CN201811651451.6A CN201811651451A CN109530612A CN 109530612 A CN109530612 A CN 109530612A CN 201811651451 A CN201811651451 A CN 201811651451A CN 109530612 A CN109530612 A CN 109530612A
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- 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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- 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
-
- 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
-
- 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
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The present invention provides a kind of lost foam casting process suitable for large and medium-sized product, including molding, coating, filling moulding, a detection of negative pressure, smelting molten steel, secondary negative pressure and casting, cutting, cleaning, polishing, material, surface, dimensional gaughing, when casting large and medium-sized product, the comprehensive performance that can be improved product avoids occurring the defects of stomata, oxide slag inclusion in product.The defects of lost foam casting process of the invention uses bottom gating, can guarantee that it is steady to fill type for molten steel when casting, avoid oxide slag inclusion, improves the castability of product；The present invention rationally designs technological parameter and processing step, facilitates the comprehensive performance for promoting product, brings economic benefit.
Description
Technical field
The present invention relates to Technology of EPC field more particularly to a kind of lost foam castings suitable for large and medium-sized product
Technique.
Background technique
Lost foam casting (also known as cavityless casting) is foam mould using bindless dry sand combination vacuum pumping technology
Cavityless casting is that bubbles model similar with casting dimension shape bonding is combined into model cluster, brushes fireproof coating and dry
Afterwards, it is embedded in vibration molding in drystone sand, is poured under negative pressure, model is made to gasify, liquid metals occupies modal position, solidifies cold
But the novel casting method of casting is formed afterwards.Compared with conventional casting technologies, lost foam casting has following features: casting quality
It is good, it is at low cost；Material is unlimited, and size is all suitable；Casting accuracy is high, and cast(ing) surface is bright and clean, reduces cleaning；Internal defect in cast is significantly
It reduces, dense structure；Automatic assembly line can realize extensive, mass production；Operating environment can be substantially improved, reduce labor
Fatigue resistance reduces energy consumption.
For large-scale, small lot casting, lost foam casting process is limited by the following aspects: 1, foaming mould makes
It is at high cost, it is difficult to be directed to Single unit job lot production；2, Casting Equipment versatility is poor；3, in casting process, heavy castings surface
Product is big, and in the state that molten metal pours into, negative pressure is destroyed, the reliability of dry sand consolidation is difficult to ensure；4, using top pouring type
Running gate system is easy to cause molten steel big to casting mold bottom impact power, molten steel large contact area with air, molten steel generate swash splash, oxygen
The defects of changing, bringing sand holes, splashings, oxide slag inclusion.
Summary of the invention
The purpose of the present invention is to provide a kind of lost foam casting process suitable for large and medium-sized product, are poured using bottom filling
The defects of injection system guarantees that it is steady to fill type for molten steel when casting, avoids oxide slag inclusion, improves the castability of product.
To achieve the above object, present invention employs following technical solutions:
A kind of lost foam casting process suitable for large and medium-sized product, comprising the following steps:
S1: finished foam plate is put into drying chamber drying by molding, and drying room temperature is 40 DEG C -55 DEG C；According to the drawing requirement of product,
Calculate corresponding dilation dimension；Cystosepiment after drying is placed on intelligent operating platform, two dimension, three-dimensional electric heating intelligence are utilized
Cutting machine carries out model cutting, engraving to cystosepiment, and detail section is operated by human assistance, and the finished product model of product is made；
S2: finished product model is placed in drying chamber and dried 2-4 hours by coating, and drying room temperature is 40 DEG C -55 DEG C；Check drying after at
After product model zero defect, using flush coater to the finished product model surface even application fireproof coating, and powder is brushed one times, and later will
Finished product model after spray refractory coating and painting is sent into drying chamber drying, then carries out second of even application, painting and baking
It is dry, so carry out 4-5 times；
S3: filling moulding will be placed in the bottom filling sandbox containing bed-sit, the bed-sit vibration by the finished product model of coating processing
Real thickness is greater than 200mm, and one end that the bottom filling sandbox contains lateral road is low side, and the other end is high-end, it is ensured that the rising pouring
The high-end and low side drop of formula sandbox is more than the height of the finished product model, and installs blind riser in the high-end suitable position,
To deslagging, exhaust；The 3-5 layers of finished product model are placed in the bottom filling sandbox up and down, each interval 200-300mm will
The finished product model of upper and lower level is connected to by the bottom filling sandbox jolt ramming with same root sprue, and last joint sealing waits casting；
The exhaust pipe of the bottom filling sandbox connect with negative pressure of vacuum system, opens the bottom filling by S4: detection of negative pressure
Sandbox leads to the valve of the negative pressure of vacuum system, starts the negative pressure of vacuum system；It detects negative in the bottom filling sandbox
Pressure degree stops the negative pressure of vacuum system if testing result is qualified；
S5: smelting molten steel throws furnace by production plan and requirement ingredient, checks that smelting equipment normally starts intermediate frequency furnace afterwards, by dust suction
Cover moves to intermediate frequency furnace place suitable for reading, sucks in dust catcher the flue gas distributed in intermediate frequency furnace using dust catcher, guarantees safety collar
It protects；When in the intermediate frequency furnace liquid steel temperature reach requirement after carry out sampling analysis, according to product requirement and sampling analysis as a result, right
Molten steel carries out composition adjustment, and sampling is sealed up for safekeeping after adjustment, and carries out deoxidation, except Slag treatment；
S6: secondary negative pressure and casting, adjustment liquid steel temperature are 1600-1640 DEG C, start the negative pressure of vacuum system, control negative pressure
Reading is 0.4-0.6Pa, is quickly poured into molten steel in the finished product model in the bottom filling sandbox from sprue gate；Casting
One terminates, and starts dither system immediately, molten steel is made to receive high frequency micro vibration in cooling, to change the interior tissue in steel
Structure improves the intensity of product；The negative pressure of vacuum system is closed within 2-5 minutes after casting, the time is appropriately extended in the big thick member in part,
Ensure that product surface molten steel forms；The bottom filling sandbox movement to sand is handled into inlet later, by the bottom filling sandbox
In the casting after high temperature modification is husky and casting pour out, casting hung to move on proprietary platform cool down；
S7: the dead head of casting after cooling is cut away, tentatively clears up the coating of the cast(ing) surface by cutting, cleaning, polishing
Layer；Casting after preliminary cleaning is placed in progress shotblasting processing in shot-blasting machine, until the cast(ing) surface is clean；To ball blast
Treated, and the casting carries out slag, gas, hole repair welding, sanding burr, the roasting shaping of heat；
S8: material, surface, dimensional gaughing are carried out to the casting Jing Guo above-mentioned processing, the casting of inspection result qualification becomes production
Product provide material acceptance report, carrying out flaw detection report, size acceptance report and product comprehensive report book, i.e. work certificate,
Product after acceptance(check) is sent into warehouse for finished product and label product number, waits factory.
Preferably, the purpose dried in step S1 be in order to: increase the intensity of material；The internal stress for eliminating material, prevents
It is deformed after the finished product model production；The coefficient of expansion of lightening material makes finished product model size in production procedure from now on
Variation is reduced, and the dimensional accuracy of product is improved.
Preferably, the fireproof coating in step S2 is by zirconium English powder, the contour temperature refractory powder material of olive mountain flour and water base viscous
Knot agent, swelling agent etc. are prepared as required, and are made after the stirring of agitated machine 4-6 hours.
Preferably, after being dried for the last time in step S2, finished product model need to be checked, finished product model must not deform,
Dope layer must not have crack, peeling phenomenon, if there is such phenomenon, the reparation that need to fill a vacancy in time is until dope layer is qualified.
Preferably, step S6 further include: the high temperature modification sand cool down by sand preparing machine, is cleaned, at dedusting
Reason, the type for becoming clean room temperature is husky, and the type sand of the clean room temperature is sent to type sand holding vessel, does standard for production next time
It is standby.
Compared with prior art, the present invention provides a kind of lost foam casting process suitable for large and medium-sized product, the bottom of using
The defects of note formula running gate system guarantees that it is steady to fill type for molten steel when casting, avoids oxide slag inclusion, improves the castability of product；It closes
Design technology parameter and processing step are managed, facilitates the comprehensive performance for promoting product, brings economic benefit.
Specific embodiment
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby cooperate embodiment detailed
It is described as follows.
The present invention provides a kind of lost foam casting process suitable for large and medium-sized product, comprising the following steps:
S1: finished foam plate is put into drying chamber drying by molding, and drying room temperature is 40 DEG C -55 DEG C；According to the drawing requirement of product,
Calculate corresponding dilation dimension；Cystosepiment after drying is placed on intelligent operating platform, two dimension, three-dimensional electric heating intelligence are utilized
Cutting machine carries out model cutting, engraving to cystosepiment, and detail section is operated by human assistance, and the finished product model of product is made；
S2: finished product model is placed in drying chamber and dried 2-4 hours by coating, and drying room temperature is 40 DEG C -55 DEG C；Check drying after at
After product model zero defect, using flush coater to finished product model surface even application fireproof coating, and powder is brushed one times, later will spraying
Finished product model after fireproof coating and painting is sent into drying chamber drying, then carries out second of even application, painting and drying, such as
This is carried out 4-5 times；This step is necessary to ensure that spraying is uniform, painting is uniform, dries thoroughly, avoids to the unfavorable shadow of subsequent handling generation
It rings；
S3: filling moulding will be placed in the bottom filling sandbox containing bed-sit by the finished product model of coating processing, and bed-sit jolt ramming is thick
Degree be greater than 200mm, bottom filling sandbox contain lateral road one end be low side, the other end be it is high-end, it is ensured that bottom filling sandbox it is high-end
It is more than the height of finished product model with low side drop, and blind riser is installed in high-end suitable position, to deslagging, exhaust, avoids pouring
When casting in casting generate stomata, dregs and influence product quality；3-5 layers of finished product model of placement above and below in bottom filling sandbox, every layer
It is spaced 200-300mm, the finished product model of upper and lower level is connected to, last joint sealing by bottom filling sandbox jolt ramming with same root sprue
Wait cast；
The exhaust pipe of bottom filling sandbox is connect by S4: detection of negative pressure with negative pressure of vacuum system, is opened bottom filling sandbox and is led to
The valve of negative pressure of vacuum system starts negative pressure of vacuum system；The vacuum degree in bottom filling sandbox is detected, if testing result is qualified,
Negative pressure of vacuum system is stopped；
S5: smelting molten steel throws furnace by production plan and requirement ingredient, checks that smelting equipment normally starts intermediate frequency furnace afterwards, by dust suction
Cover moves to intermediate frequency furnace place suitable for reading, sucks in dust catcher the flue gas distributed in intermediate frequency furnace using dust catcher, guarantees safety and environmental protection；When
Liquid steel temperature carries out sampling analysis after reaching requirement in intermediate frequency furnace, according to product requirement and sampling analysis as a result, carrying out to molten steel
Composition adjustment, sampling is sealed up for safekeeping after adjustment, and carries out deoxidation, except Slag treatment；
S6: secondary negative pressure and casting, adjustment liquid steel temperature are 1600-1640 DEG C, start negative pressure of vacuum system, control negative pressure reading
For 0.4-0.6Pa, quickly molten steel is poured into the finished product model in bottom filling sandbox from sprue gate；Casting one terminates, immediately
Start dither system, molten steel is made to receive high frequency micro vibration in cooling, to change the internal organizational structure in steel, improves and produce
The intensity of product；The time is appropriately extended in 2-5 minutes closing negative pressure of vacuum systems after casting, the big thick member in part, it is ensured that product surface steel
Water molding；Bottom filling sandbox movement to sand is handled into inlet later, by the high temperature modification sand in bottom filling sandbox and after casting
Casting is poured out, and casting is hung to move on proprietary platform cools down；
S7: cutting, cleaning, polishing cut away the dead head of casting after cooling, the preliminary dope layer for clearing up cast(ing) surface,
The dope layer of cast(ing) surface has peeled off automatically in cooling procedure；Casting after preliminary cleaning is placed in shot-blasting machine and carries out surface
Shot Blasting, until cast(ing) surface is clean；Casting progress slag after Shot Blasting, gas, hole repair welding, sanding burr, heat are baked whole
Shape；
S8: material, surface, dimensional gaughing are carried out to the casting Jing Guo above-mentioned processing, the casting of inspection result qualification becomes production
Product provide material acceptance report, carrying out flaw detection report, size acceptance report and product comprehensive report book, i.e. work certificate,
Product after acceptance(check) is sent into warehouse for finished product and label product number, waits factory.
The purpose dried in step S1 be in order to: increase the intensity of material；The internal stress for eliminating material, prevents finished product model
It is deformed after production；The coefficient of expansion of lightening material reduces finished product model change in size in production procedure from now on, improves product
Dimensional accuracy.
Preferably, the fireproof coating in step S2 by zirconium English powder, the contour temperature refractory powder material of olive mountain flour and water based adhesive,
Swelling agent etc. is prepared as required, and is made after the stirring of agitated machine 4-6 hours.
Preferably, after being dried for the last time in step S2, finished product model need to be checked, finished product model must not deform,
Dope layer must not have crack, peeling phenomenon, if there is such phenomenon, the reparation that need to fill a vacancy in time is until dope layer is qualified.
Preferably, step S6 further include: high temperature modification sand cool down by sand preparing machine, is cleaned, dust removal process, is made
Its type for becoming clean room temperature is husky, and the type sand of clean room temperature is sent to type sand holding vessel, prepares for production next time.
The present invention provides a kind of lost foam casting process suitable for large and medium-sized product, using bottom gating, protects
The defects of it is steady to fill type for molten steel when card casting, avoids oxide slag inclusion, improves the castability of product；Rationally design technological parameter and
Processing step facilitates the comprehensive performance for promoting product, brings economic benefit.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (5)
1. a kind of lost foam casting process suitable for large and medium-sized product, it is characterised in that: the following steps are included:
S1: finished foam plate is put into drying chamber drying by molding, and drying room temperature is 40 DEG C -55 DEG C；According to the drawing requirement of product,
Calculate corresponding dilation dimension；Cystosepiment after drying is placed on intelligent operating platform, two dimension, three-dimensional electric heating intelligence are utilized
Cutting machine carries out model cutting, engraving to cystosepiment, and detail section is operated by human assistance, and the finished product model of product is made；
S2: finished product model is placed in drying chamber and dried 2-4 hours by coating, and drying room temperature is 40 DEG C -55 DEG C；Check drying after at
After product model zero defect, using flush coater to the finished product model surface even application fireproof coating, and powder is brushed one times, and later will
Finished product model after spray refractory coating and painting is sent into drying chamber drying, then carries out second of even application, painting and baking
It is dry, so carry out 4-5 times；
S3: filling moulding will be placed in the bottom filling sandbox containing bed-sit, the bed-sit vibration by the finished product model of coating processing
Real thickness is greater than 200mm, and one end that the bottom filling sandbox contains lateral road is low side, and the other end is high-end, it is ensured that the rising pouring
The high-end and low side drop of formula sandbox is more than the height of the finished product model, and installs blind riser in the high-end suitable position,
To deslagging, exhaust；The 3-5 layers of finished product model are placed in the bottom filling sandbox up and down, each interval 200-300mm will
The finished product model of upper and lower level is connected to by the bottom filling sandbox jolt ramming with same root sprue, and last joint sealing waits casting；
The exhaust pipe of the bottom filling sandbox connect with negative pressure of vacuum system, opens the bottom filling by S4: detection of negative pressure
Sandbox leads to the valve of the negative pressure of vacuum system, starts the negative pressure of vacuum system；It detects negative in the bottom filling sandbox
Pressure degree stops the negative pressure of vacuum system if testing result is qualified；
S5: smelting molten steel throws furnace by production plan and requirement ingredient, checks that smelting equipment normally starts intermediate frequency furnace afterwards, by dust suction
Cover moves to intermediate frequency furnace place suitable for reading, sucks in dust catcher the flue gas distributed in intermediate frequency furnace using dust catcher, guarantees safety collar
It protects；When in the intermediate frequency furnace liquid steel temperature reach requirement after carry out sampling analysis, according to product requirement and sampling analysis as a result, right
Molten steel carries out composition adjustment, and sampling is sealed up for safekeeping after adjustment, and carries out deoxidation, except Slag treatment；
S6: secondary negative pressure and casting, adjustment liquid steel temperature are 1600-1640 DEG C, start the negative pressure of vacuum system, control negative pressure
Reading is 0.4-0.6Pa, is quickly poured into molten steel in the finished product model in the bottom filling sandbox from sprue gate；Casting
One terminates, and starts dither system immediately, molten steel is made to receive high frequency micro vibration in cooling, to change the interior tissue in steel
Structure improves the intensity of product；The negative pressure of vacuum system is closed within 2-5 minutes after casting, the time is appropriately extended in the big thick member in part,
Ensure that product surface molten steel forms；The bottom filling sandbox movement to sand is handled into inlet later, by the bottom filling sandbox
In the casting after high temperature modification is husky and casting pour out, casting hung to move on proprietary platform cool down；
S7: the dead head of casting after cooling is cut away, tentatively clears up the coating of the cast(ing) surface by cutting, cleaning, polishing
Layer；Casting after preliminary cleaning is placed in progress shotblasting processing in shot-blasting machine, until the cast(ing) surface is clean；To ball blast
Treated, and the casting carries out slag, gas, hole repair welding, sanding burr, the roasting shaping of heat；
S8: material, surface, dimensional gaughing are carried out to the casting Jing Guo above-mentioned processing, the casting of inspection result qualification becomes production
Product provide material acceptance report, carrying out flaw detection report, size acceptance report and product comprehensive report book, i.e. work certificate,
Product after acceptance(check) is sent into warehouse for finished product and label product number, waits factory.
2. the lost foam casting process of major diameter dwarf forms product as described in claim 1, it is characterised in that: dried in step S1
Purpose be in order to: increase the intensity of material；The internal stress for eliminating material deforms after preventing the finished product model from producing；Mitigate
The coefficient of expansion of material reduces finished product model change in size in production procedure from now on, improves the dimensional accuracy of product.
3. being suitable for the lost foam casting process of large and medium-sized product as described in claim 1, it is characterised in that: in step S2
The fireproof coating is prepared as required by zirconium English powder, the contour temperature refractory powder material of olive mountain flour and water based adhesive, swelling agent etc., and
Agitated machine is made after stirring 4-6 hours.
4. being suitable for the lost foam casting process of large and medium-sized product as described in claim 1, it is characterised in that: in step S2 most
Afterwards after first drying, finished product model need to be checked, finished product model must not deform, and dope layer must not have crack, peeling phenomenon,
If there is such phenomenon, the reparation that need to fill a vacancy in time is until dope layer is qualified.
5. being suitable for the lost foam casting process of large and medium-sized product as described in claim 1, it is characterised in that: step S6 is also wrapped
It including: the high temperature modification sand cool down by sand preparing machine, is cleaned, dust removal process, the type for becoming clean room temperature is husky,
The type sand of the clean room temperature is sent to type sand holding vessel, is prepared for production next time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651451.6A CN109530612A (en) | 2018-12-31 | 2018-12-31 | A kind of lost foam casting process suitable for large and medium-sized product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651451.6A CN109530612A (en) | 2018-12-31 | 2018-12-31 | A kind of lost foam casting process suitable for large and medium-sized product |
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Citations (7)
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|---|---|---|---|---|
| CN1382542A (en) * | 2002-03-26 | 2002-12-04 | 华中科技大学 | Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould |
| CN104259387A (en) * | 2014-09-05 | 2015-01-07 | 安徽省宁国市华达耐磨材料有限公司 | Process method for vibration casting molding of lost foam casting |
| CN104353782A (en) * | 2014-10-27 | 2015-02-18 | 无锡乐华自动化科技有限公司 | Lost foam casting process of high-manganese steel sieve plate |
| CN104550832A (en) * | 2013-10-21 | 2015-04-29 | 青岛五洋铸机有限公司 | Magnesium and aluminum alloy antigravity evaporative pattern casting method |
| CN206898353U (en) * | 2017-05-24 | 2018-01-19 | 张治平 | A kind of disappearance die-cast aluminum device |
| CN108917413A (en) * | 2018-07-27 | 2018-11-30 | 浙江工业大学 | A kind of intermediate frequency furnace electrical dust collector device |
| CN108941513A (en) * | 2018-09-26 | 2018-12-07 | 成都艾特安科技有限公司 | Metallic pressure conveys shell moulded casting method |
-
2018
- 2018-12-31 CN CN201811651451.6A patent/CN109530612A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382542A (en) * | 2002-03-26 | 2002-12-04 | 华中科技大学 | Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould |
| CN104550832A (en) * | 2013-10-21 | 2015-04-29 | 青岛五洋铸机有限公司 | Magnesium and aluminum alloy antigravity evaporative pattern casting method |
| CN104259387A (en) * | 2014-09-05 | 2015-01-07 | 安徽省宁国市华达耐磨材料有限公司 | Process method for vibration casting molding of lost foam casting |
| CN104353782A (en) * | 2014-10-27 | 2015-02-18 | 无锡乐华自动化科技有限公司 | Lost foam casting process of high-manganese steel sieve plate |
| CN206898353U (en) * | 2017-05-24 | 2018-01-19 | 张治平 | A kind of disappearance die-cast aluminum device |
| CN108917413A (en) * | 2018-07-27 | 2018-11-30 | 浙江工业大学 | A kind of intermediate frequency furnace electrical dust collector device |
| CN108941513A (en) * | 2018-09-26 | 2018-12-07 | 成都艾特安科技有限公司 | Metallic pressure conveys shell moulded casting method |
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Application publication date: 20190329 |