CN107214299A - A kind of process for dewaxing of investment casting shell - Google Patents
A kind of process for dewaxing of investment casting shell Download PDFInfo
- Publication number
- CN107214299A CN107214299A CN201710376257.0A CN201710376257A CN107214299A CN 107214299 A CN107214299 A CN 107214299A CN 201710376257 A CN201710376257 A CN 201710376257A CN 107214299 A CN107214299 A CN 107214299A
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- Prior art keywords
- dewaxing
- shell
- temperature
- paraffin
- wax
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Classifications
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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
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
Abstract
A kind of process for dewaxing of investment casting shell, carried out in the equipment such as drying box or roaster, by rationally controlling heating-up temperature and soaking time, paraffin and polystyrene is smoothly uninterruptedly flowed out in dewaxing process, the fusible pattern residual that dewaxing terminates in rear shell is few, and dewaxing efficiency is higher.It is computed dewaxing efficiency and reaches more than 70%.The present invention is applied to the resolution ratio of paraffin in various dewaxing devices, dewaxing process within 10%, the basic decomposition without polystyrene.Compared with only taking off the method for paraffin when other are without dewaxing process or dewaxing, present invention greatly reduces pollution of the shell in roasting process to air.
Description
Technical field
The invention belongs to Investment casting technology field, and in particular to a kind of dewaxing side of rapid shaping investment casting shell
Method.
Background technology
Model casting is a kind of method that shell and pouring cast part is made in mould material of use meltability.The work of model casting
Skill process is that one layer of slurry being made up of refractory powder and binding agent is coated on fusible pattern group surface, one layer of fire sand is then spread, repeated
Repeatedly until forming certain thickness shell, then poured into a mould after drying, dewaxing, roasting, and the casting after shelling is carried out
Certain cleaning, inspection and heat treatment, completes the manufacture of investment-casting.
Suppressed more than wax-pattern used in traditional model casting using die mould, and use selective laser sintering (SLS) technology can
With two dimension, the 3-D graphic provided according to user, or by being scanned resulting file data in kind, without making
The mould of standby pressure wax, quickly and accurately produces original shape part, highly shortened the model casting cycle, and can make shape
Almost arbitrarily complicated part, therefore receive the concern of height, extensive utilization has been obtained in model casting field.
Polystyrene (PS) Polymer material, the accuracy of manufacture is higher, is often used to do SLS mould material, but it also has power
The problem of intensity is relatively low, surface smoothness is not enough is learned, therefore SLS prototypes have to pass through waxdip post processing.Conventional waxdip material
Material is paraffin, more than melting point of paraffin wax temperature, and sintered part immersed into paraffin, and liquid paraffin will be inside rapid osmotic sintered part
Hole.With temperature reduction paraffin cooled and solidified, the hole on inside sintered part and surface can be padded and become even closer
It is smooth, so as to improve the intensity and finish of prototype.
Yang Jingsong et al. exists《SLS Wax Properties and full form casting process research》(Special Processes of Metal Castings and non-ferrous alloy 2007
The 1st phase of volume 27) in mention, SLS moulds material is high polymer material based on polystyrene, and polystyrene is more than decomposition temperature
The chemical constitutions such as styrene extremely unsaturated monomer can be resolved into when heated, when monomer enters gas-phase combustion, due to double bond, benzene
The oxygen demand of ring burning is big, so a large amount of black smokes that even can also be emerged in unlimited air because of incomplete combustion.This meeting
Greatly pollution is caused to air.On the other hand, if oxygen content is not enough in combustion, one layer of fine and close carbon will be formed
Change the surface that layer is covered in mould material, hinder the further decomposition and burning of SLS mould material so that the removing of mould material is incomplete, behind
Pouring technology in cause casting slag inclusion.
A kind of quick fusible pattern for being based on photocuring (SL) is proposed in Publication No. CN103722127A innovation and creation
Casting method, this method uses the wax pattern of complex parts the 3D printing resin-made of higher photocuring (SL) mode of cost
Make, then compound module is formed by wax running gate system and light-cured resin prototype.This method only sloughs running channel wax, resin when dewaxing
Sloughed in roasting process, stove is entered using high temperature, make colophony prototype conflagration, but it is possible to occur imperfect combustion,
Environment is caused than more serious pollution.
Proposed in Publication No. CN103128229A innovation and creation a kind of powder sintered quick based on precinct laser
The model casting die cavity clean method of forming technique application, its technical scheme is：During module group assembling process, on the top of wax-pattern and
Secondary top welding dreg discharging tunnel and dirt trap, after shell processed, dewaxing process, liquid wax-pattern can be efficiently controlled in calcining process
Flowing excludes the aggregation with remaining residue, so as to obtain the die cavity of cleaning.This method can be for solution wax-pattern in roasting process
In be stranded in the problem of forming residue in die cavity, it is to avoid the generation of cast casting defect, but implement inconvenient, it is also possible to ring
Cause than more serious pollution in border.
The content of the invention
To overcome the shortcomings of environment to be caused than more serious pollution present in prior art, invention is proposed one kind
The process for dewaxing of investment casting shell.
The present invention detailed process be：
Step 1, dewaxed at cast gate.The shell that painting is hung up properly is put into electric drying oven with forced convection, adjusts electric heating forced air drying
The temperature of case, makes shell be incubated 60min at 150 DEG C.
Step 2, the abjection of paraffin and polystyrene.The temperature of electric drying oven with forced convection is adjusted, makes shell with 2~3 temperature
The ladder-elevating temperature mode of degree gradient is warming up to 170~190 DEG C, and is incubated 60~120min respectively in each thermograde；Complete
Dewaxing to shell.
The detailed process of the ladder-elevating temperature is：First thermograde is 170~180 DEG C, and second thermograde is
>180 DEG C≤190 DEG C, the 3rd thermograde=190 DEG C.
In the insulation dewaxing, the wax material for dissolving and flowing into afterwards in container is emptied once per 30min, to avoid dissolving
Wax material afterwards is decomposed in drying box.
The shell dewaxing that the present invention is hung over for painting at present on Quick-forming wax-pattern is difficult, if roasting direct is again seriously polluted
The problem of, and seek a kind of of low pollution, easy to operate process for dewaxing, with reach cleaning casting, Green foundry purpose.
The process for dewaxing of the present invention is carried out in the equipment such as drying box or roaster, and dewaxing device planted agent, which places, contains wax appearance
Device, and take out within every 0.5~1 hour to topple over and once decomposed with the wax for avoiding outflow in dewaxing device, during insulation in step
Between should be adjusted according to the size and structure of casting.
The present invention is for SLS mould material roasting directs are big for environment pollution, the problem of be also easy to produce wax-pattern residue, and setting one has
The heating dewaxing process of effect.Because the fusing point difference of paraffin and polystyrene is larger, paraffin melting point is about 62 DEG C, and polystyrene melts
About 180 DEG C of point, and both are rolled in together in fusible pattern, it is impossible to first paraffin is taken off completely heat up again take off polyphenyl second
Alkene.From accompanying drawing 1, paraffin starts to decompose at 150 DEG C or so, and PS powder starts to decompose at 230 DEG C or so.When dewaxing temperature is less than
At 150 DEG C, paraffin and polystyrene can not flow substantially, and dewaxing efficiency is low；When dewaxing temperature is higher than 190 DEG C, paraffin is just opened
Beginning decomposition is smoldered.Therefore consider to be dewaxed using 150-190 DEG C of this section of temperature sections.Dewax the incipient stage, it is considered to first
Be incubated in lower temperature makes the fusible pattern softening at cast gate is overall to drop for a period of time, is that standard is carried out in dewaxing at relatively high temperatures below
It is standby.Then being warming up to higher temperature insulation a period of time makes paraffin and polystyrene uninterruptedly flow out, thus can be with reduction type
Shell pollution on the environment in follow-up roasting process.
In order to verify the holding temperature and soaking time of dewaxing technique, substantial amounts of experiment is employed, be finally found that, the first rank
The dewaxing process of section can not have polyphenyl second substantially in 150 DEG C of insulations 1 hour so that the wax at cast gate integrally drops, at a temperature of this
Alkene is flowed out so soaking time need not be oversize.Second stage can be so that big in 3~5 hours of 170~190 DEG C of segmentation insulations
Part paraffin and polystyrene outflow.The purpose of segmentation insulation is to gradually rise temperature, and paraffin and polystyrene are made as far as possible not
Flowed out in the case of decomposition, reduce environmental pollution；It can cause dewaxing activity time oversize if soaking time is oversize, be unfavorable for work
Industry is produced.
It is that paraffin and polystyrene smoothly can uninterruptedly flow in dewaxing process using the beneficial effect after the inventive method
Go out, the fusible pattern residual that dewaxing terminates in rear shell is few, and dewaxing efficiency is higher.The efficiency of dewaxing is calculated using weight method,
Dewaxing efficiency=(quality of shell after quality-dewaxing of shell after drying)/wax-pattern gross mass × 100%, finds the de- of shell
Wax efficiency is more than 70%.The process for dewaxing of the present invention is applied to might have on a small quantity in various dewaxing devices, dewaxing process
Paraffin decompose, but paraffin resolution ratio within 10%, the basic decomposition without polystyrene.With other without dewaxing
When journey or dewaxing the technical process of paraffin is only taken off to compare, present invention greatly reduces shell in roasting process to air
Pollution.
Brief description of the drawings
It in the thermogravimetric curve of paraffin and polystyrene mould material in air atmosphere in temperature-rise period, figure 1 is that paraffin exists that Fig. 1, which is,
Thermogravimetric curve under air atmosphere in temperature-rise period, 2 be that thermogravimetric of the polystyrene mould material in air atmosphere in temperature-rise period is bent
Line.
Fig. 2 is the dewaxing effect figure after 150 DEG C of insulations 1 hour in embodiment one.
Fig. 3 is the dewaxing effect figure in embodiment one respectively after 180 DEG C, 190 DEG C of insulations 2 hours.
Fig. 4 is the flow chart of the present invention.
Embodiment
Embodiment one
The present embodiment is a kind of process for dewaxing of rapid shaping investment casting shell, and specific implementation step is as follows：
Step 1, dewaxed at cast gate.The shell that painting is hung up properly is put into electric drying oven with forced convection, adjusts electric heating forced air drying
The temperature of case, makes shell be incubated 60min at 150 DEG C.In insulation, placed in the cast gate of shell and the lower section of steam vent for accepting
The wax liquor of outflow, per the wax liquor for emptying the inside in half an hour, is taken out drying box by the container of wax material in time, to avoid it dry
Decomposed in dry case.
Step 2, the abjection of paraffin and polystyrene.The temperature of electric drying oven with forced convection is adjusted, makes shell with 2 temperature ladders
The ladder-elevating temperature mode of degree is warming up to 180~190 DEG C, and is incubated 100min respectively in each thermograde；Complete to shell
Dewaxing.In insulation dewaxing, the wax liquor dissolved and flowed into afterwards in container is emptied once per 30min, to avoid wax liquor in drying
Decomposed in case.In the present embodiment, shell is warming up to 180 DEG C and 100min is incubated.After insulation terminates, shell is continuously heating to
The dewaxing to shell is completed after 190 DEG C of insulation 100min.
In the present embodiment, shell 150 DEG C insulation 1 hour after dewaxing effect as shown in Figure 2, it can be seen that wax-pattern become
Soft, the wax-pattern at cast gate integrally drops, and with there is paraffin outflow.The dewaxing effect such as institute of accompanying drawing 3 at the end of shell dewaxing
Show, it can be seen that basic flow is complete for paraffin there is the vestige that polystyrene goes out along cast gate wall, steam vent into plume.Dewax
Cheng Hou, passes through dewaxing formula:
Dewaxing efficiency=(quality of shell after quality-dewaxing of shell after drying)/wax-pattern gross mass × 100%.
The dewaxing efficiency for calculating the present embodiment is 85%.
Embodiment two
The present embodiment is a kind of process for dewaxing of rapid shaping investment casting shell, and specific implementation step is as follows：
Step 1, dewaxed at cast gate.The shell that painting is hung up properly is put into electric drying oven with forced convection, adjusts electric heating forced air drying
The temperature of case, makes shell be incubated 60min at 150 DEG C.In insulation, placed in the cast gate of shell and the lower section of steam vent for accepting
The wax liquor of outflow, per the wax liquor for emptying the inside in half an hour, is taken out drying box by the container of wax material in time, to avoid it dry
Decomposed in dry case.
Step 2, the abjection of paraffin and polystyrene.The temperature of electric drying oven with forced convection is adjusted, makes shell with 2 temperature ladders
The ladder-elevating temperature mode of degree is warming up to 175~180 DEG C, and is incubated 120min respectively in each thermograde；Complete to shell
Dewaxing.In insulation dewaxing, the wax liquor dissolved and flowed into afterwards in container is emptied once per 30min, to avoid wax liquor in drying
Decomposed in case.In the present embodiment, shell is warming up to 175 DEG C and 120min is incubated.After insulation terminates, shell is continuously heating to
The dewaxing to shell is completed after 180 DEG C of insulation 120min.
After the completion of dewaxing, pass through dewaxing formula:
Dewaxing efficiency=(quality of shell after quality-dewaxing of shell after drying)/wax-pattern gross mass × 100%.
The dewaxing efficiency for calculating the present embodiment is 75%.
Embodiment three
The present embodiment is a kind of process for dewaxing of rapid shaping investment casting shell, and specific implementation step is as follows：
Step 1, dewaxed at cast gate.The shell that painting is hung up properly is put into electric drying oven with forced convection, adjusts electric heating forced air drying
The temperature of case, makes shell be incubated 60min at 150 DEG C.In insulation, placed in the cast gate of shell and the lower section of steam vent for accepting
The wax liquor of outflow, per the wax liquor for emptying the inside in half an hour, is taken out drying box by the container of wax material in time, to avoid it dry
Decomposed in dry case.
Step 2, the abjection of paraffin and polystyrene.The temperature of electric drying oven with forced convection is adjusted, makes shell with 3 temperature ladders
The ladder-elevating temperature mode of degree is warming up to 170~190 DEG C, and is incubated 90min respectively in each thermograde；Completion takes off to shell
Wax.In insulation dewaxing, the wax liquor dissolved and flowed into afterwards in container is emptied once per 30min, to avoid wax liquor in drying box
It is interior to decompose.In the present embodiment, shell is warming up to 170 DEG C and 90min is incubated.After insulation terminates, shell is continuously heating to 180
DEG C and be incubated after 90min, complete dewaxing to shell after shell is continuously heating into 190 DEG C of insulation 90min again.In insulation
In dewaxing, the wax liquor dissolved and flowed into afterwards in container is emptied once per 30min, to avoid wax liquor from being decomposed in drying box.
After the completion of dewaxing, pass through dewaxing formula:
Dewaxing efficiency=(quality of shell after quality-dewaxing of shell after drying)/wax-pattern gross mass × 100%.
The dewaxing efficiency for calculating the dewaxing of the present embodiment is 76%.
Claims (3)
1. a kind of process for dewaxing of investment casting shell, it is characterised in that detailed process is：
Step 1, dewaxed at cast gate：The shell that painting is hung up properly is put into electric drying oven with forced convection, regulation electric drying oven with forced convection
Temperature, makes shell be incubated 60min at 150 DEG C；
Step 2, the abjection of paraffin and polystyrene：The temperature of electric drying oven with forced convection is adjusted, makes shell with 2~3 temperature ladders
The ladder-elevating temperature mode of degree is warming up to 170~190 DEG C, and is incubated 60~120min respectively in each thermograde；Complete to type
The dewaxing of shell.
2. the process for dewaxing of investment casting shell as claimed in claim 1, it is characterised in that in insulation dewaxing, will per 30min
The wax material for dissolving and flowing into afterwards in container is emptied once, to avoid the wax material after dissolving from being decomposed in drying box.
3. the process for dewaxing of investment casting shell as claimed in claim 1, the detailed process of the ladder-elevating temperature is：First temperature
It is 170~180 DEG C to spend gradient, and second thermograde is>180 DEG C≤190 DEG C, the 3rd thermograde=190 DEG C.
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| CN201710376257.0A CN107214299B (en) | 2017-05-25 | 2017-05-25 | A kind of process for dewaxing of investment casting shell |
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| CN201710376257.0A CN107214299B (en) | 2017-05-25 | 2017-05-25 | A kind of process for dewaxing of investment casting shell |
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| CN107214299A true CN107214299A (en) | 2017-09-29 |
| CN107214299B CN107214299B (en) | 2019-05-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107838373A (en) * | 2017-11-09 | 2018-03-27 | 西北工业大学 | The complicated closed aluminium alloy box body shell body casting precision casting molding method of ultra-thin-wall |
| CN109226685A (en) * | 2018-11-23 | 2019-01-18 | 安徽应流航源动力科技有限公司 | A kind of precision-investment casting dewaxing filter device |
| CN110385400A (en) * | 2019-08-13 | 2019-10-29 | 西安西工大超晶科技发展有限责任公司 | A kind of process for dewaxing of 3D printing PS powder wax-pattern |
| CN110842145A (en) * | 2019-12-27 | 2020-02-28 | 西安西工大超晶科技发展有限责任公司 | 3D printing wax pattern dust-free dewaxing method |
| CN114012101A (en) * | 2021-09-30 | 2022-02-08 | 山西省化工研究所（有限公司） | Preparation method of high-strength high-toughness stainless steel powder for selective laser melting additive manufacturing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325078A (en) * | 2014-10-23 | 2015-02-04 | 北京星航机电装备有限公司 | Dewaxing equipment for removing wax mould in precision-investment casting |
| CN105436406A (en) * | 2015-12-01 | 2016-03-30 | 华中科技大学无锡研究院 | Precision lost wax casting technology based on selective laser powder sintering 3D printing |
-
2017
- 2017-05-25 CN CN201710376257.0A patent/CN107214299B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325078A (en) * | 2014-10-23 | 2015-02-04 | 北京星航机电装备有限公司 | Dewaxing equipment for removing wax mould in precision-investment casting |
| CN105436406A (en) * | 2015-12-01 | 2016-03-30 | 华中科技大学无锡研究院 | Precision lost wax casting technology based on selective laser powder sintering 3D printing |
Non-Patent Citations (3)
| Title |
|---|
| 刘灿成: "基于整体式石膏型的网架结构件快速精铸工艺研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
| 杨劲松等: "SLS模料特性及熔模铸造工艺研究", 《特种铸造及有色合金》 * |
| 熊旭: "基于SLS快速熔模精铸的尺寸精度及传递规律研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107838373A (en) * | 2017-11-09 | 2018-03-27 | 西北工业大学 | The complicated closed aluminium alloy box body shell body casting precision casting molding method of ultra-thin-wall |
| CN109226685A (en) * | 2018-11-23 | 2019-01-18 | 安徽应流航源动力科技有限公司 | A kind of precision-investment casting dewaxing filter device |
| CN110385400A (en) * | 2019-08-13 | 2019-10-29 | 西安西工大超晶科技发展有限责任公司 | A kind of process for dewaxing of 3D printing PS powder wax-pattern |
| CN110842145A (en) * | 2019-12-27 | 2020-02-28 | 西安西工大超晶科技发展有限责任公司 | 3D printing wax pattern dust-free dewaxing method |
| CN114012101A (en) * | 2021-09-30 | 2022-02-08 | 山西省化工研究所（有限公司） | Preparation method of high-strength high-toughness stainless steel powder for selective laser melting additive manufacturing |
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| CN107214299B (en) | 2019-05-10 |
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