CN106273094A - Epoxy resin pattern manufacture method for photoelastic test - Google Patents
Epoxy resin pattern manufacture method for photoelastic test Download PDFInfo
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- CN106273094A CN106273094A CN201610900973.XA CN201610900973A CN106273094A CN 106273094 A CN106273094 A CN 106273094A CN 201610900973 A CN201610900973 A CN 201610900973A CN 106273094 A CN106273094 A CN 106273094A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of epoxy resin pattern manufacture method for photoelastic test, comprise the following steps: a, employing stereolithograghy photosensitive resin model formpiston；B, on photosensitive resin model formpiston use vacuum placingJi Shu cast silicone rubber former；C, taking-up photosensitive resin model formpiston obtain the silicone rubber former of molding；D, silicone rubber for sealing former；E, in silicone rubber former by the vacuum casting process method casting epoxy resin model of photoelastic model；F, epoxy resin pattern is carried out post processing, obtain the epoxy resin pattern of molding.Automaticity is high, fabrication cycle is shorter, environmental protection, internal primary stress are less, it is adaptable to Core Engine, the qualitative photoelastic test in technical identification machine stage.
Description
Technical field
The present invention relates to aircraft engine parts modeling techniques field, especially, relate to a kind of for aeroplane engine
The epoxy resin pattern manufacture method of the qualitative photoelastic test of machine core engine or technical identification machine.
Background technology
Along with the low wind can saved research fund, shorten the lead time is found by the country having advanced aeronautical technology in the world
After danger technical thought and technological approaches, traditional photoelastic test technology is reformed the most in good time and can not be fully met aviation
The needs of reseach of engine.Photoelastic test belongs to model test, needs to use the epoxy of optical property and good mechanical properties
Resin mould, tradition epoxy resin pattern manufacture method based on placingJi Shu includes: machining wooden model formpiston, cast silicon rubber
Glue former, taking-up formpiston, sealing former, casting epoxy resin model and model post processing.The method automaticity is low, all
Phase length, not environmentally.
In the modelling technology that photoelastic test field is relevant, there is a kind of photosensitive resin modelling technology, its profit
With rapid laser-shaping technique straight forming photosensitive resin model.The photosensitive resin model quality of this fabrication techniques is not so good as at present
Epoxy resin pattern quality is good, and mainly key technical index optical sensitivity is low, next to that there is also certain primary stress.
Domestic photoelastic test uses the main flow of model to be epoxy resin pattern rather than photosensitive resin model.Photoelastic test technology is
The subject that engineering is extremely strong, the needs that aero-engine to be adapted to is developed, it is necessary to development new technique, new method.With regard to modelling
For, it is high in the urgent need to automaticity, the cycle is short, the new method of environmental protection.
Summary of the invention
The invention provides a kind of epoxy resin pattern manufacture method for photoelastic test, with solve traditional based on
The epoxy resin pattern manufacture method fabrication cycle length of placingJi Shu, manufacturing process are harmful, and automaticity is low；At light
In the modelling technology that elasticity test field is relevant, the main of rapid laser-shaping technique straight forming photosensitive resin model lacks
Point is that optical sensitivity is low, and next there is also certain primary stress, is difficult to adapt to the technology of the needs that aero-engine is developed
Problem.
The present invention provides a kind of epoxy resin pattern manufacture method for photoelastic test, comprises the following steps: a, adopt
With stereolithograghy photosensitive resin model formpiston；B, employing vacuum placingJi Shu cast on photosensitive resin model formpiston
Silicone rubber former；C, taking-up photosensitive resin model formpiston obtain the silicone rubber former of molding；D, silicone rubber for sealing former；E, at silicon
By the vacuum casting process method casting epoxy resin model of photoelastic model in rubber former；F, epoxy resin pattern is entered
Row post processing, obtains the epoxy resin pattern of molding.
Further, stereolithograghy photosensitive resin model formpiston in step a, particularly as follows: based on liquid photosensitive tree
The photopolymerization principle of fat, there is rapidly light in liquid photosensitive resin material under the ultraviolet light of the specific wavelength set and intensity irradiates
Polyreaction, molecular weight is increased dramatically, and liquid photosensitive resin material changes from liquid to solid, and forms the photosensitive resin mould of solid-state
Type formpiston.
Further, vacuum placingJi Shu cast silicone rubber former in step b, particularly as follows: stir from silicone rubber raw material
Mix the overall process started to silicone rubber female mould forming to carry out the most under vacuum conditions, with abundant in silicone rubber former manufacturing process
Extract the bubble in material and moisture out, it is to avoid silicone rubber former lacks the phenomenon of material and bubbles.
Further, step c is taken out photosensitive resin model formpiston, particularly as follows: along point mould of photosensitive resin model formpiston
Silicone rubber former scratched by line；Non-principal force part during the test of die parting line Selection Model, and the die parting line simple circuit of employing；Profit
Taking-up photosensitive resin model formpiston is broken into two with one's hands from the die parting line position scratched by the elasticity of silicone rubber former.
Further, silicone rubber for sealing former in step d, use and make the identical material of employing, phase with silicone rubber former
With equipment and identical technique silicone rubber former is sealed, particularly as follows: weighed silicone rubber material and firming agent；Point
Do not pour in controlled mixed-hopper and the controlled hopper of manufacture equipment；Silicone rubber former good for pretreatment and thin plate peripheral frame are placed
On the hoistable platform of the equipment of manufacture；Regulation podium level is inserted in feed pipe the counterflow unit of manufacture equipment, and uses band
Tie；Start manufacture equipment and weave program；Vacuum stirring temperature-controlling chamber and model forming room evacuation to the equipment of manufacture；?
Firming agent in controlled hopper pours into controlled mixed-hopper and mixes, and starts the stirring motor of manufacture equipment simultaneously, and protects
Hold vacuum and be mixed into air therein to get rid of；Compound is slowly injected into thin plate peripheral frame by guiding device；Compound is toppled over complete,
Vacuum stirring temperature-controlling chamber stops evacuation；Evacuation is continued in the model forming room of the equipment of manufacture；Stop the mould to the equipment of manufacture
Type forming room evacuation, then divides three phases air inlet；At room temperature place, or put into baking box, the silicone rubber of cast
Can fully solidify, carry out silicone rubber curing schedule；Complete the sealing to silicone rubber former.
Further, in step e, the vacuum casting process method casting epoxy resin model of photoelastic model, utilizes vacuum
Casting molding machine and the silicone rubber former being arranged in vacuum forming machine carry out moulding by casting, particularly as follows: dispensing is installed with mould,
The weight of the photoelastic model poured into a mould as required weighs up epoxy resin and along fourth dilute two respectively according to the ratio of 100:30～35
Anhydride, pours epoxy resin in the first controlled hopper of vacuum pouring forming machine, and br dilute anhydride is poured into second can material controlling
Bucket, is placed on curing mold silicone rubber former indoor, and the height of regulation hoistable platform is until conveniently watching silicon by observation window
After the charging aperture of rubber former and discharging opening, mozzle is inserted the charging aperture of silicone rubber former；Vacuum automatic casting molding, accurate
After standby work is fully completed, start vacuum pouring forming machine, to vacuum stirring temperature-controlling chamber and model forming room evacuation, set the
One controlled hopper, the second controlled hopper, controlled mixed-hopper and the temperature value of curing mold room and temperature retention time, setting terminates
Time temperature regulating device automatically work, be automatically switched off at the end of temperature retention time, at the end of the temperature retention time of the first controlled hopper, first
Controlled hopper Automatic-dumping, epoxy resin flows into controlled mixed-hopper, then the second controlled hopper Automatic-dumping by drainage screen,
Br dilute anhydride therein is poured into controlled mixed-hopper, starts stirring motor simultaneously, until after bi-material mix homogeneously,
Stopping stirring motor, open sealing lid, slowly topple over controlled mixed-hopper, compound is slowly injected into silicone rubber by guiding device
Former, compound is toppled over complete, each device automatic homing, and cast end evacuation the most again is after 3-5 hour, and curing mold room is permanent
Temperature is until stopping after photoelastic model molding；Form removal and solidification: the model after solidification for the first time is taken from silicon rubber mould
Go out, amputate overlap and dead head, be placed in calorstat and carry out solidifying for the second time.
Further, the charging aperture of vacuum pouring forming machine cast sets at the bottom of epoxy resin mould mould, discharging opening
Put the position easily occurring lacking material at epoxy resin pattern, in order to avoid cast model occurs lacking material phenomenon；Vacuum stirring temperature-controlling chamber with
The pressure reduction of curing mold room is less than 20KPa, and the persistent period is less than 5 minutes, in order to avoid air enters model and forms bubble；Vacuum
The negative pressure of casting molding machine is less than 80KPa, and to avoid, vacuum is too high takes compound away, causes model to lack material and compound enters
Enter vacuum pipe, affect vacuum system and normally work；Silicone rubber former is fully warmed-up, and internal and external temperature all reaches 60 DEG C just to start down
Compound；The process of compound stirring, cast and molding must keep constant temperature.
Further, vacuum pouring forming machine by arranging isolating and protecting in vacuum stirring temperature-controlling chamber, be spaced first can
Material controlling bucket, the second controlled hopper and controlled mixed-hopper, when making epoxy resin and two kinds of raw material volatilizations of br dilute anhydride, inhale
It is attached on the isolating and protecting that is spaced；A small amount of volatile matter enters the snake bend cavity of vacuum pouring forming machine and adheres to curved
On inside pipe wall face, present in air, volatile matter major part is filtered, and subsequently into vacuum pump, thus reaches to protect vacuum pump
Purpose.
Further, the epoxy resin model post processing of step f, particularly as follows: epoxy resin pattern gelling solidifies to top layer
After, scratch silicone rubber former gently, not injure epoxy resin pattern as principle；After epoxy resin pattern fully solidifies, excision
Sprue gate and the unnecessary material of discharging opening, visually inspect intact material phenomenon and bubble exists, to indivedual rough local with thin
Sand paper is polished, the critical size of metering epoxy resin pattern, it is allowed to maximum error 2%.
Further, epoxy resin pattern makes complete, once anneals according to annealing curve, eliminates the processing of model
Stress.
The method have the advantages that
The present invention is for the epoxy resin pattern manufacture method of photoelastic test, and relatively conventional technology has automaticity
High, the cycle is short, environmental protection and the little feature of the internal primary stress of model.Be conducive to shortening the cycle of photoelastic test, improving examination
The precision tested.Optical sensitivity is more preferable than photosensitive resin model.This method automaticity is high, fabrication cycle is shorter, environmental protection, interior
Portion's primary stress is less, it is adaptable to Core Engine, the qualitative photoelastic test in technical identification machine stage.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing a further understanding of the present invention, and the present invention's is schematic real
Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart element of the epoxy resin pattern manufacture method for photoelastic test of the preferred embodiment of the present invention
Figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the present invention can be limited by following and
The multitude of different ways covered is implemented.
Fig. 1 is the flow chart element of the epoxy resin pattern manufacture method for photoelastic test of the preferred embodiment of the present invention
Figure.As it is shown in figure 1, the epoxy resin pattern manufacture method for photoelastic test of the present embodiment, comprise the following steps: a, adopt
With stereolithograghy photosensitive resin model formpiston；B, employing vacuum placingJi Shu cast on photosensitive resin model formpiston
Silicone rubber former；C, taking-up photosensitive resin model formpiston obtain the silicone rubber former of molding；D, silicone rubber for sealing former；E, at silicon
By the vacuum casting process method casting epoxy resin model of photoelastic model in rubber former；F, epoxy resin pattern is entered
Row post processing, obtains the epoxy resin pattern of molding.The present invention is for the epoxy resin pattern manufacture method of photoelastic test, phase
Conventional art is had that automaticity is high, the cycle is short, environmental protection and the little feature of the internal primary stress of model.Be conducive to shortening
The cycle of photoelastic test, the precision of raising test.Optical sensitivity is more preferable than photosensitive resin model.This method automaticity
High, fabrication cycle is shorter, environmental protection, internal primary stress are less, it is adaptable to Core Engine, technical identification machine stage
Qualitative photoelastic test.
In the present embodiment, stereolithograghy photosensitive resin model formpiston in step a, particularly as follows: based on liquid photosensitive
The photopolymerization principle of resin, liquid photosensitive resin material occurs rapidly under the ultraviolet light of the specific wavelength set and intensity irradiates
Photopolymerization reaction, molecular weight is increased dramatically, and liquid photosensitive resin material changes from liquid to solid, and forms the photosensitive resin of solid-state
Model formpiston.
In the present embodiment, vacuum placingJi Shu cast silicone rubber former in step b, particularly as follows: from silicone rubber raw material
Stirring starts to the overall process of silicone rubber female mould forming to carry out the most under vacuum conditions, to fill in silicone rubber former manufacturing process
Divide the bubble and moisture extracted out in material, it is to avoid silicone rubber former lacks the phenomenon of material and bubbles.
In the present embodiment, step c is taken out photosensitive resin model formpiston, particularly as follows: dividing along photosensitive resin model formpiston
Loft scratches silicone rubber former；Non-principal force part during the test of die parting line Selection Model, and the die parting line simple circuit of employing；
The elasticity utilizing silicone rubber former breaks taking-up photosensitive resin model formpiston into two with one's hands from the die parting line position scratched.
In the present embodiment, silicone rubber for sealing former in step d, use with the silicone rubber former making identical material of employing,
Silicone rubber former is sealed by identical equipment and identical technique, particularly as follows: weighed silicone rubber material and firming agent；
Pour into respectively in controlled mixed-hopper and the controlled hopper of manufacture equipment；Silicone rubber former good for pretreatment and thin plate peripheral frame are put
Put on the hoistable platform of the equipment of manufacture；Regulation podium level is inserted in feed pipe the counterflow unit of manufacture equipment, and with pricking
Band ties；Start manufacture equipment and weave program；Vacuum stirring temperature-controlling chamber and model forming room evacuation to the equipment of manufacture；
Firming agent in controlled hopper is poured into controlled mixed-hopper mix, start the stirring motor of manufacture equipment simultaneously, and
Vacuum is kept to be mixed into air therein to get rid of；Compound is slowly injected into thin plate peripheral frame by guiding device；Compound has been toppled over
Finishing, vacuum stirring temperature-controlling chamber stops evacuation；Evacuation is continued in the model forming room of the equipment of manufacture；Stop the equipment of manufacture
Model forming room evacuation, then divides three phases air inlet；At room temperature place, or put into baking box, the silicon rubber of cast
Glue can fully solidify, and carries out silicone rubber curing schedule；Complete the sealing to silicone rubber former.Technological process is simple, operation side
Just, it is not necessary to newly increase equipment and new technology, use the raw material identical with silicone rubber former as encapsulant, sealant with
Model can intact one entirety of formation, it is to avoid the deformation that potting syrup seepage and big fastening force cause, and significantly improves sealing
Success rate and airtight quality, the photoelastic model physical dimension using it as former cast is accurate, and error is little.
In the present embodiment, the vacuum casting process method casting epoxy resin model of photoelastic model in step e, utilize true
Empty casting molding machine and the silicone rubber former being arranged in vacuum forming machine carry out moulding by casting, particularly as follows: dispensing is pacified with mould
Dress, the weight of the photoelastic model poured into a mould as required weighs up epoxy resin respectively according to the ratio of 100:30～35 and suitable fourth is dilute
Dicarboxylic anhydride, pours epoxy resin in the first controlled hopper of vacuum pouring forming machine, br dilute anhydride is poured into second controlled
Hopper, is placed on curing mold silicone rubber former indoor, and the height of regulation hoistable platform is until conveniently watching by observation window
After the charging aperture of silicone rubber former and discharging opening, mozzle is inserted the charging aperture of silicone rubber former；Vacuum automatic casting molding,
After preparation is fully completed, start vacuum pouring forming machine, to vacuum stirring temperature-controlling chamber and model forming room evacuation, set
First controlled hopper, the second controlled hopper, controlled mixed-hopper and the temperature value of curing mold room and temperature retention time, set knot
During bundle, temperature regulating device works automatically, is automatically switched off at the end of temperature retention time, at the end of the temperature retention time of the first controlled hopper, the
One controlled hopper Automatic-dumping, epoxy resin flows into controlled mixed-hopper by drainage screen, and then the second controlled hopper inclines automatically
Fall, br dilute anhydride therein is poured into controlled mixed-hopper, starts stirring motor simultaneously, until bi-material mix homogeneously
After, stopping stirring motor, open sealing lid, slowly topple over controlled mixed-hopper, compound is slowly injected into silicon by guiding device
Rubber former, compound is toppled over complete, each device automatic homing, and cast terminates evacuation after 3-5 hour the most again, curing mold
Room constant temperature is until stopping after photoelastic model molding；Form removal and solidification: by the model after solidification for the first time from silicon rubber mould
Middle taking-up, amputates overlap and dead head, is placed in calorstat and carries out solidifying for the second time.Automaticity is high, and technological process is simple,
Easy to operate, improve raw-material purity, it is to avoid material uneven, constant temperature cast and stir and can effectively eliminate
" cloud and mist " and the initial stress of reduction cast, the photoelastic model interior mechanics of cast and good in optical property, physical dimension is accurate, by mistake
Difference is little, and casting process is harmless to human body.
In the present embodiment, the charging aperture of vacuum pouring forming machine cast is at the bottom of epoxy resin mould mould, discharging opening
It is arranged on epoxy resin pattern and easily occurs lacking the position of material, in order to avoid cast model occurs lacking material phenomenon；Vacuum stirring temperature-controlling chamber
It is less than 5 minutes less than 20KPa, persistent period with the pressure reduction of curing mold room, in order to avoid air enters model and forms bubble；Very
The negative pressure of empty casting molding machine is less than 80KPa, and to avoid, vacuum is too high takes compound away, causes model to lack material and compound
Enter vacuum pipe, affect vacuum system and normally work；Silicone rubber former is fully warmed-up, and internal and external temperature all reaches 60 DEG C just to start
Compound；The process of compound stirring, cast and molding must keep constant temperature.
In the present embodiment, vacuum pouring forming machine is by arranging isolating and protecting in vacuum stirring temperature-controlling chamber, to be spaced first
Controlled hopper, the second controlled hopper and controlled mixed-hopper, when making epoxy resin and two kinds of raw material volatilizations of br dilute anhydride,
Absorption is on the isolating and protecting being spaced；A small amount of volatile matter enters the snake bend cavity of vacuum pouring forming machine and adheres to
On elbow internal wall face, present in air, volatile matter major part is filtered, and subsequently into vacuum pump, thus reaches to protect vacuum pump
Purpose.
In the present embodiment, the epoxy resin model post processing of step f, particularly as follows: epoxy resin pattern gelling is solid to top layer
After change, scratch silicone rubber former gently, not injure epoxy resin pattern as principle；After epoxy resin pattern fully solidifies, cut
Except sprue gate and the unnecessary material of discharging opening, visually inspect intact material phenomenon and bubble exists, to indivedual rough local use
Fine sandpaper is polished, the critical size of metering epoxy resin pattern, it is allowed to maximum error 2%.
In the present embodiment, epoxy resin pattern makes complete, once can anneal according to annealing curve, to eliminate model
Machining stress.
During enforcement, a kind of automaticity is high, fabrication cycle is shorter, environmental protection, modelling that internal primary stress is less
Method.Utilize the multiple advanced technologies inside and outside industry that traditional model production method is reformed, accelerate test overall progress
With raising test accuracy.It is suitable for Core Engine, the qualitative photoelastic test in technical identification machine stage.
The new method that epoxy resin pattern makes is divided six stages, respectively stereolithograghy photosensitive resin model sun
Mould, vacuum placingJi Shu cast silicone rubber former, take out photosensitive resin model, three with encapsulating method silicone rubber for sealing former,
The vacuum casting process method cast model of photoelastic model and model post processing.
Stereolithograghy photosensitive resin model formpiston
Stereolithograghy (SLA) technology is photopolymerization principle based on liquid photosensitive resin work, this liquid
Material (can occur rapidly photopolymerization reaction, molecular weight to be increased dramatically, material at the ultraviolet light of certain wavelength and intensity under irradiation
The most just change from liquid to solid.The error of high-precision laser fast shaping machine forming model is at 0.1mm.This technology is quickly
Forming field is used widely, and it is quick, environmental protection.Utilize this advanced technology straight forming photosensitive resin model formpiston, up to
To the purpose shortening the modelling cycle.
Vacuum placingJi Shu cast silicone rubber former
Vacuum placingJi Shu starts to the overall process of model forming to carry out the most under vacuum conditions from raw material stirring, phase
Original portion link the most more can be extracted effectively bubble and moisture out, it is to avoid silicone rubber model lacks material and has bubble
Phenomenon, can improve quality and the one-time success rate of model cast.This technology is used widely in rapid shaping field, utilizes it
Cast silicone rubber former, can reach and improve silicone rubber former quality and improve the purpose of modelling efficiency.
Take out photosensitive resin model
Scratching silicone rubber former along die parting line scalpel, take out photosensitive resin model, die parting line is model test as far as possible
Time non-principal force part, and die parting line will be to be simply preferred, and silicone rubber model has preferable elasticity, breaks into two with one's hands can take out with hands
Model.
Three with encapsulating method silicone rubber for sealing former
Sealing silicone rubber former by identical raw material, equipment and technique, the quality of sealing is high and can be once
Success.The deformation utilizing the method silicone rubber for sealing former is little, is sealed to power 100%.
The vacuum casting process method cast model of photoelastic model
The vacuum casting process method of photoelastic model, automaticity is high, and technological process is simple, easy to operate, improves
Raw-material purity, it is to avoid material uneven, constant temperature cast and stir and can effectively eliminate " cloud and mist " and reduction waters
The initial stress of note, the photoelastic model interior mechanics of cast and good in optical property, physical dimension is accurate, and error is little, casting process
Harmless to human body.Utilizing this method and vacuum pouring molding function thereof to improve the quality of epoxy resin pattern, casting process is green
Colour circle is protected.
Model post processing
Epoxy resin pattern is gelled, and after solidifying to top layer, scratches silicone rubber former gently, not injure epoxy resin pattern
For principle, need SC.Silicone rubber former is single use, and the most reusable purpose is to ensure that occurring without die sinking makes
The phenomenon that model is small, microlesion or outside minimal stress now is become to enter model and model can be caused to go out when secondary solidifies
Existing crackle.After model fully solidifies, excision sprue gate and the fifth wheel of discharging opening, visually inspect intact material phenomenon and bubble is deposited
, indivedual rough places fine sandpaper is polished, the critical size of metering model, it is allowed to maximum error 2%.Model
Make and complete once can anneal according to annealing curve if desired, eliminate the machining stress of model.
As a example by the 3 trapezoidal tenons of tooth, tongue-and-groove modelling, it is embodied as follows:
A) the 3 trapezoidal tenons of tooth, tongue-and-groove UG drawing are first designed.It is converted into laser fast according to the requirement of rapid laser-shaping technique
The form of speed forming machine.Putting into photosensitive resin raw material in laser fast shaping machine, starting device directly becomes after programming
Pattern type.
B) formpiston made is carried out support and put in a thin hardboard peripheral frame and be placed into together vacuum pouring
In type machine, weigh the raw material needed for model cast according to RTV silicone rubber 988#: the ratio of firming agent=100:1.8, utilized
Vacuum pouring forming machine and silicone rubber vacuum casting process realize vacuum automatic casting.After cast terminates, autostop, allow silicon
Rubber former spontaneous curing.
C), after the spontaneous curing of silicone rubber former, thin hardboard peripheral frame is removed.According to test specification, choose the non-of test
Stress surface or secondary stress surface arrange die parting line, scratch silicone rubber former with scalpel along die parting line, and former is the most all scratched, only
Drawing about the 2/3 of former type entire length, two people coordinate, and a people breaks silicone rubber former into two with one's hands with hands, and another person takes out
Photosensitive resin model.
D) doing a thick charging aperture of comparison bottom silicone rubber former, a thinner discharging opening is respectively made on both sides, top
A thinner discharging opening is done in portion, again gets togather silicone rubber former.One people pins silicone rubber former gently, and another is with ordering
Die parting line ordered by book pin.
Making a thin peripheral frame more bigger than silicone rubber former with hardboard, four material mouths of silicone rubber former are plugged conduit
After be fixed in thin peripheral frame.When placing thin peripheral frame, four material mouths should avoid the sprue gate of vacuum pouring forming machine to avoid cast
Liquid enters feeding mouth.The raw material needed for model seals has been weighed according to RTV silicone rubber 988#: the ratio of firming agent=100:1.8,
Utilizing vacuum pouring forming machine and silicone rubber vacuum casting process to realize vacuum automatic casting, sealant is higher than silicone rubber former
About 3mm, must not be higher than the height of discharging opening.After cast terminates, autostop, allow silicone rubber former sealant spontaneous curing.
E), after the spontaneous curing of silicone rubber former sealant, remove thin hardboard peripheral frame and check that silicone rubber former seals matter
Amount.Confirm that sealing is docked at one end of charging aperture conduit on the sprue gate of vacuum pouring forming machine and solid with band after intact
Fixed.The aspect ratio silicone rubber former of three discharging openings is slightly higher.
Weight according to epoxy resin pattern to be poured into a mould weighs up asphalt mixtures modified by epoxy resin respectively according to the part by weight of 100:30～35
Fat (128) and maleic anhydride, pour the controlled hopper of vacuum pouring forming machine respectively into.Utilize vacuum pouring forming machine and light
The vacuum casting process method of elastic model realizes vacuum automatic casting.After cast terminates, autostop, allow epoxy resin mould
Type isothermal cure.
F) epoxy resin pattern isothermal cure all solidifies to top layer, when inside is not fully cured, stops solidification for the first time,
Two people's cooperations, a people takes mould, and another people scratches silicone rubber former gently, takes overwhelming majority silicone rubber away, retains fixing support
The part of effect carries out second time and solidifies.After model fully solidifies, excision sprue gate and the fifth wheel of discharging opening, visually inspect nothing
Lack material phenomenon and bubble exists, indivedual rough places fine sandpaper is polished, the critical size of metering model, it is allowed to
In kind and design drawing size maximum error is 2%.
The present invention utilizes the advanced technology inside and outside industry to remove from office the key link of traditional model production method comprehensively
Newly.Change that conventional fabrication method automaticity is low, cycle length, shortcoming not environmentally.By the advanced technology pair inside and outside industry
The corresponding link of conventional art is transformed, and achieves marked improvement, so that new method has automaticity height, cycle
Short, environmental protection and the little feature of the internal primary stress of model.Relatively conventional technology achieves marked improvement, makes new method have certainly
Dynamicization degree is high, the cycle is short, environmental protection and the little feature of the internal primary stress of model.Be conducive to shortening the week of photoelastic test
Phase, the precision of raising test.Relative to the photosensitive resin modelling technology developed, its mature and reliable, with existing skill
Art matching is good, and the unit that epoxy resin pattern uses is many, occupies leading position；Its optical sensitivity is than photosensitive resin model
Good a lot.Current technology is respectively arranged with pluses and minuses, when different industries carries out photoelastic test, selects suitable mould according to respective condition
Type manufacture method.
The present invention is suitable for photoelasticity qualitative test research for the epoxy resin pattern manufacture method of photoelastic test
Modelling.Epoxy resin pattern the most still occupies leading position at present, the model range that other material makes
All do not have it wide.Quantitative photoelastic test research to required precision is high should not use this method.Laser fast shaping machine pushes away
Recommending the equipment using Xi'an Communications University's exploitation, the product of equal accuracy can also.Model annealing curve can be according to photoelasticity
The secondary cure profile of the vacuum casting process method of model is carried out.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the epoxy resin pattern manufacture method for photoelastic test, it is characterised in that comprise the following steps:
A, employing stereolithograghy photosensitive resin model formpiston；
B, on photosensitive resin model formpiston use vacuum placingJi Shu cast silicone rubber former；
C, taking-up photosensitive resin model formpiston obtain the silicone rubber former of molding；
D, silicone rubber for sealing former；
E, in silicone rubber former by the vacuum casting process method casting epoxy resin model of photoelastic model；
F, epoxy resin pattern is carried out post processing, obtain the epoxy resin pattern of molding.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 1, it is characterised in that
Stereolithograghy photosensitive resin model formpiston in described step a, particularly as follows:
Photopolymerization principle based on liquid photosensitive resin, liquid photosensitive resin material is in the specific wavelength set and the ultraviolet of intensity
There is rapidly photopolymerization reaction under irradiating in light, molecular weight is increased dramatically, and liquid photosensitive resin material changes from liquid to solid, shape
Become the photosensitive resin model formpiston of solid-state.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 1, it is characterised in that
Vacuum placingJi Shu cast silicone rubber former in described step b, particularly as follows:
Start to the overall process of silicone rubber female mould forming to carry out the most under vacuum conditions, with silicon rubber from the stirring of silicone rubber raw material
Glue former manufacturing process is fully extracted the bubble in material and moisture, it is to avoid silicone rubber former lacks the phenomenon of material and bubbles out.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 1, it is characterised in that
Described step c is taken out photosensitive resin model formpiston, particularly as follows:
Die parting line along photosensitive resin model formpiston scratches silicone rubber former；
Non-principal force part during the test of die parting line Selection Model, and the die parting line simple circuit of employing；
The elasticity utilizing silicone rubber former breaks taking-up photosensitive resin model formpiston into two with one's hands from the die parting line position scratched.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 1, it is characterised in that
Silicone rubber for sealing former in described step d, use with the silicone rubber former making identical material of employing, identical equipment with
And silicone rubber former is sealed by identical technique, particularly as follows:
Silicone rubber material and firming agent are weighed；
Pour into respectively in controlled mixed-hopper and the controlled hopper of manufacture equipment；
Silicone rubber former good for pretreatment and thin plate peripheral frame are placed on the hoistable platform of manufacture equipment；
Regulation podium level is inserted in feed pipe the counterflow unit of manufacture equipment, and ties with band；
Start manufacture equipment and weave program；Vacuum stirring temperature-controlling chamber and model forming room evacuation to the equipment of manufacture；
Firming agent in controlled hopper is poured into controlled mixed-hopper mix, start the stirring horse of manufacture equipment simultaneously
Reach, and keep vacuum to be mixed into air therein to get rid of；
Compound is slowly injected into thin plate peripheral frame by guiding device；
Compound is toppled over complete, and vacuum stirring temperature-controlling chamber stops evacuation；
Evacuation is continued in the model forming room of the equipment of manufacture；
Stop the model forming room evacuation to the equipment of manufacture, then divide three phases air inlet；
At room temperature placing, or put into baking box, the silicone rubber of cast can fully solidify, and carries out silicone rubber solidification step
Suddenly；
Complete the sealing to silicone rubber former.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 1, it is characterised in that
In described step e, the vacuum casting process method casting epoxy resin model of photoelastic model, utilizes vacuum pouring molding
Machine and the silicone rubber former being arranged in vacuum forming machine carry out moulding by casting, particularly as follows:
Dispensing is installed with mould, and the weight of the photoelastic model poured into a mould as required weighs up respectively according to the ratio of 100:30～35
Epoxy resin and br dilute anhydride, pour epoxy resin in the first controlled hopper of vacuum pouring forming machine, along fourth dilute two
Anhydride pours the second controlled hopper into, silicone rubber former is placed on curing mold indoor, and the height of regulation hoistable platform is until side
After will pass through charging aperture and the discharging opening of observation window viewing silicone rubber former, mozzle is inserted the charging aperture of silicone rubber former；
Vacuum automatic casting molding, after preparation is fully completed, starts vacuum pouring forming machine, to vacuum stirring temperature-controlling chamber and
Model forming room evacuation, sets the first controlled hopper, the second controlled hopper, controlled mixed-hopper and the temperature of curing mold room
Value and temperature retention time, at the end of setting, temperature regulating device works automatically, is automatically switched off at the end of temperature retention time, when first can material controlling
At the end of the temperature retention time of bucket, the first controlled hopper Automatic-dumping, epoxy resin flows into controlled mixed-hopper by drainage screen, connects
The second controlled hopper Automatic-dumping, br dilute anhydride therein poured into controlled mixed-hopper, starts stirring motor simultaneously,
Until after bi-material mix homogeneously, stopping stirring motor, opening sealing lid, slowly toppling over controlled mixed-hopper, compound leads to
Crossing guiding device and be slowly injected into silicone rubber former, compound is toppled over complete, each device automatic homing, and cast terminates to take out very the most again
After empty 3-5 hour, curing mold room constant temperature is until stopping after photoelastic model molding；
Form removal and solidification: the model after solidification for the first time is taken out from silicon rubber mould, amputates overlap and dead head, be placed on perseverance
Incubator carries out second time solidify.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 6, it is characterised in that
The charging aperture of vacuum pouring forming machine cast is arranged on epoxy resin mould at the bottom of epoxy resin mould mould, discharging opening
Easily there is lacking the position of material in type, in order to avoid cast model occurs lacking material phenomenon；
Vacuum stirring temperature-controlling chamber is less than 20KPa with the pressure reduction of curing mold room, and the persistent period is less than 5 minutes, in order to avoid air
Enter model and form bubble；
The negative pressure of vacuum pouring forming machine be less than 80KPa, to avoid, vacuum is too high takes compound away, cause model lack material and
Compound enters vacuum pipe, affects vacuum system and normally works；
Silicone rubber former is fully warmed-up, and internal and external temperature all reaches 60 DEG C and just starts down compound；
The process of compound stirring, cast and molding must keep constant temperature.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 6, it is characterised in that
Vacuum pouring forming machine by arranging isolating and protecting in vacuum stirring temperature-controlling chamber, be spaced the first controlled hopper, second can
Material controlling bucket and controlled mixed-hopper, when making epoxy resin and the volatilization of two kinds of raw materials of br dilute anhydride, adsorb and be spaced
On isolating and protecting；
A small amount of volatile matter enters the snake bend cavity of vacuum pouring forming machine and adheres on elbow internal wall face, deposits in air
Volatile matter major part filtered, subsequently into vacuum pump, thus reach to protect the purpose of vacuum pump.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 1, it is characterised in that
Described step f epoxy resin model post processing, particularly as follows:
After epoxy resin pattern gelling solidifies to top layer, scratch silicone rubber former gently, be former not injure epoxy resin pattern
Then；
After epoxy resin pattern fully solidifies, excision sprue gate and the unnecessary material of discharging opening, visually inspect intact material phenomenon and
Bubble exists, and polishes indivedual rough places fine sandpaper, the critical size of metering epoxy resin pattern, it is allowed to
Big error 2%.
Epoxy resin pattern manufacture method for photoelastic test the most according to claim 9, it is characterised in that
Epoxy resin pattern makes complete, once anneals according to annealing curve, to eliminate the machining stress of model.
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| CN109278324A (en) * | 2018-09-13 | 2019-01-29 | 中国航发湖南动力机械研究所 | Photosensitive resin model and its post-processing approach |
| CN109297900A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | Judge the method for epoxy resin layer bonding situation in epoxy sleeve pipe-repairing |
| CN109702937A (en) * | 2018-12-04 | 2019-05-03 | 深圳市强义科技有限公司 | LED display module manufacturing method |
| CN111397780A (en) * | 2020-03-30 | 2020-07-10 | 中国航发湖南动力机械研究所 | Method for improving rotating stress fringe level value of epoxy resin photoelastic model |
| CN111823697A (en) * | 2020-07-28 | 2020-10-27 | 李强 | Epoxy resin seal cutting art seal copying process |
| CN113514178A (en) * | 2021-04-16 | 2021-10-19 | 江南大学 | Photoelastic stress measurement system and method based on three-wavelength illumination light source |
| CN114102938A (en) * | 2021-11-16 | 2022-03-01 | 贵州电网有限责任公司 | Method for rapid modeling and repairing damage of porcelain insulator of power equipment |
| CN117400538A (en) * | 2023-12-11 | 2024-01-16 | 华侨大学 | Three-dimensional photoelastic model rapid forming method combined with 3D printing |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109297900A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | Judge the method for epoxy resin layer bonding situation in epoxy sleeve pipe-repairing |
| CN109297900B (en) * | 2017-07-25 | 2021-07-02 | 中国石油天然气股份有限公司 | Method for judging bonding condition of epoxy resin layer in epoxy sleeve repairing pipeline |
| CN109278324A (en) * | 2018-09-13 | 2019-01-29 | 中国航发湖南动力机械研究所 | Photosensitive resin model and its post-processing approach |
| CN109278324B (en) * | 2018-09-13 | 2021-04-02 | 中国航发湖南动力机械研究所 | Photosensitive resin mold and post-processing method thereof |
| CN109702937A (en) * | 2018-12-04 | 2019-05-03 | 深圳市强义科技有限公司 | LED display module manufacturing method |
| CN111397780A (en) * | 2020-03-30 | 2020-07-10 | 中国航发湖南动力机械研究所 | Method for improving rotating stress fringe level value of epoxy resin photoelastic model |
| CN111823697A (en) * | 2020-07-28 | 2020-10-27 | 李强 | Epoxy resin seal cutting art seal copying process |
| CN113514178A (en) * | 2021-04-16 | 2021-10-19 | 江南大学 | Photoelastic stress measurement system and method based on three-wavelength illumination light source |
| CN114102938A (en) * | 2021-11-16 | 2022-03-01 | 贵州电网有限责任公司 | Method for rapid modeling and repairing damage of porcelain insulator of power equipment |
| CN117400538A (en) * | 2023-12-11 | 2024-01-16 | 华侨大学 | Three-dimensional photoelastic model rapid forming method combined with 3D printing |
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