CN109826785A - Fuel pump the cover and preparation method thereof in a kind of automobile engine nacelle - Google Patents
Fuel pump the cover and preparation method thereof in a kind of automobile engine nacelle Download PDFInfo
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- CN109826785A CN109826785A CN201711185931.3A CN201711185931A CN109826785A CN 109826785 A CN109826785 A CN 109826785A CN 201711185931 A CN201711185931 A CN 201711185931A CN 109826785 A CN109826785 A CN 109826785A
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- fuel pump
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- lower die
- foaming
- cover
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Abstract
The present invention relates to fuel pump the covers in a kind of automobile engine nacelle and preparation method thereof, the cover and the shape of fuel pump match, it is characterized in that, the fuel pump the cover is double-layer structure, the hard skinning that outer layer is, internal layer is the middle layer between the endosexine that endosexine is soft skinning and connection outer layer and endosexine, carries out two one-step formings by two width molds.Compared with prior art, outer layer hard skinning of the present invention has sound insulation value, and internal layer has sound absorption function, while having the ageing-resistant fire-retardant characteristic of high temperature resistant, and fuel pump the cover can achieve the effect that reduce noise.
Description
Technical field
The present invention relates to a kind of automobile sound-absorbing damping parts, more particularly, to fuel pump cover in a kind of automobile engine nacelle
Lid and preparation method thereof.
Background technique
NVH (noise, vibration and sound vibration roughness) is a global question for measuring automobile manufacture quality, it gives automobile
Being experienced as user is most direct.The NVH problem of vehicle is that the major vehicle manufacturing enterprise of international automobile industry and parts enterprises close
One of the problem of note.Enging cabin noise is one of car noise dominant noise source, if wanting for vehicle noise reduction, then to start
Cabin noise reduction is essential, however the enging cabin fuel pump of automobile industry is generally exposed, fuel pump operating noise at present
It is one of enging cabin dominant noise source again, and fuel pump matching area is complex-shaped, temperature is high when work, so needing material
With excellent processability and heat-resisting ageing-resisting flame retardant property；Noise can be obstructed again and absorb noise reduces so as to reach
The material of noise result.
Chinese patent CN102529839A disclose a kind of multilayered structure automobile engine nacelle sound-heat insulated cushion and its
Production method, the sound-heat insulated cushion are three-decker, and upper surface layer and undersurface layer are density 100g/cm2Non-woven fabrics, it is intermediate
Layer is 13~18kg/m of density3Flame retardant polyurethane layer, graphite powder, polyethers, isocyanates hybrid slicing are obtained fire-retardant poly-
Polyurethane foaming layer and nonwoven, are then arranged in molding die by urethane foaming layer, and compression process obtains the vapour of multilayered structure
Car engine cabin sound insulating pad, but the product is to be pressed and molded part for cabin cover sound insulating pad and the outer firewall of front wall, this
Composite foamed part with the application be it is entirely different, the application can not be solved according to noise sources such as high-pressure oil pump, oily rails
Component is designed exploitation, and the technical issues of wrap up noise source.
Summary of the invention
Have it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is both able to satisfy
The ageing-resistant resistance to fire-retardant characteristic use demand of high temperature, will not generate noise, and can reach the automobile engine nacelle combustion of noise reduction effect
Oil pump the cover and preparation method thereof.
The purpose of the present invention can be achieved through the following technical solutions:
Fuel pump the cover in a kind of automobile engine nacelle, matches with the shape of fuel pump, which is bilayer
Structure, the hard skinning that outer layer is, internal layer are between the endosexine that endosexine is soft skinning and connection outer layer and endosexine
Middle layer.Extexine (the visible surface side after assembly) is hard skinning, and quality is harder, endosexine (the non-visible surface after assembly
Side) it is soft skinning, quality is softer, while guaranteeing internal rigidity, reduces the resonance between each component, middle layer is being sent out
It is the soft bubble structure of aperture, quality is very soft, and sound-absorbing effect is strong inside the fuel pump cover of motivation cabin.
Outer layer is Multi-component Polyurethane foaming structure as a preferred technical solution,.
Middle layer is to add the Multi-component Polyurethane foaming structure of graphite as a preferred technical solution,.
As a preferred technical solution, outer layer with a thickness of 1~3mm, certain rigidity is kept, if the thickness of hard skinning
Less than 1mm, rigidity is too small, and soundproof effect is bad, influences the processability and sound insulation value of final products, if hard skinning
Thickness be greater than 3mm, rigidity is excessive, and product has biggish internal stress after molding, influences product appearance, reduces the finished product of product
Rate, long-time service can also be easy to produce the deformation as caused by internal stress.Due to material property, the soft skinning of endosexine can be produced
It is raw, but the soft skinning is too thick to will affect sound-absorbing, the present invention controls soft skinning in the relatively thin range of 0.1~0.5mm.
The density of the soft bubble material layers of aperture is 120~200kg/m3, so that having high temperature while product is with preferable sound absorption qualities
Ageing-resistant resistance to fire-retardant characteristic.
The cover directly wraps up engine compartment components as a preferred technical solution, the enging cabin portion
Part includes high pressure fuel pump and high pressure fuel rail etc..
The cover of the invention can directly wrap up engine components, especially high pressure fuel pump and high pressure fuel
Rail, so that assembly is simpler.
The production method of fuel pump the cover in automobile engine nacelle carries out two one-step formings by two width molds, and use is following
Step:
A) formable layer in: by the foaming raw material of internal layer in interior formable layer mold foaming, the internal layer shaping mould
Tool includes upper die and lower die, and wherein upper die and lower die match the internal layer cavity to be formed and be matched with the shape of fuel pump extexine,
Forming step is as follows:
(a-1) control lower die temperature is 50~60 DEG C and keeps the temperature；
(a-2) control upper mold temperature is 50~60 DEG C and keeps the temperature；
(a-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine；
(a-4) aqueous release agent is sprayed in upper mold；
(a-5) aqueous release agent is sprayed in lower die；
(a-6) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(a-7) it is closed upper mold and lower die, foaming raw material is made to foam, cure, form in foam chamber；
(a-8) mold is opened, endosexine part blank is obtained；
(a-9) overlap of internal layer part blank is removed；
B) outer formable layer: by the internal layer blank of forming in a on the molding mould core of outer layer, the hair of outer layer
Raw material foaming in outer formable layer mold is steeped, outer layer molding die includes upper die and lower die, mold core, and wherein model plays solid
Determine the effect of internal layer blank, upper die and lower die match to form fuel pump cover appearance, the mold core of outer layer molding die need with it is interior
Layer blank cavity exact matching, forming step are as follows:
(b-1) control lower die temperature is 45~50 DEG C and keeps the temperature；
(b-2) control upper mold temperature is 75~85 DEG C and keeps the temperature；
(b-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine；
(b-4) solvent release agent is sprayed in upper mold；
(b-5) solvent release agent is sprayed in lower die；
(b-6) on mold core, internal layer blank is installed；
(b-7) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(b-8) it is closed upper mold and lower die, foaming raw material is made to foam, cure, form in foam chamber；
(b-9) mold is opened, fuel pump hood feature blank is obtained；
(b-10) fuel pump hood feature blank is put into cooling shaping fixture, natural cooling 100 seconds or more；
(b-11) overlap for removing fuel pump hood feature blank, obtains fuel pump the cover.
The temperature of upper mold is higher in internal layer forming process, and controls at 75~85 DEG C, can destroy skinning, and it is thick to reduce skinning
Degree, generates relatively thin soft skinning, then by using solvent release agent, make soft skinning material surface holes, to increase
Sound absorption qualities.The temperature of lower die is lower, and controls at 45~50 DEG C, facilitates the combination of foaming raw material, and can make generation
Foaming layer forms hard extexine in conjunction with outer layer, then by using aqueous release agent, it is bright and clean to improve hard outer skin surface
Degree.
The foaming raw material of the outer layer is grouped as by the group of following degree: 55~60wt% of polyethers, isocyanic acid
45~40wt% of ester,
The foaming raw material of the internal layer is grouped as by the group of following degree: 68~73wt% of polyethers, isocyanic acid
32~27wt% of ester, also containing the physical blowing agent of 8wt% in polyethers.
The physical blowing agent is pentamethylene or LBA foaming agent.
The aqueous release agent takes water as a solvent, effective component be silicone substance, the solvent release agent with
Methylene chloride is solvent, and effective component is paraffin.
With after lower die, internal pressure is controlled in 0.4~0.5MPa, curing temperature: 50-60 closure upper mold in step (a-7)
DEG C, molding time: 120S~180S；
With after lower die, internal pressure is controlled in 0.4~0.5MPa, curing temperature: lower die 45 closure upper mold in step (b-8)
~50 DEG C, 75-85 DEG C of upper mold, molding time: 240S~300S；
The cooling shaping fixture has the support portion to fit with part blank bottom surface, is furnished with heat dissipation on the support portion
Through-hole, in this way fitting with part blank bottom surface by support portion setting, can be avoided part blank and generate in cooling procedure
Deformation, improves the qualification rate of product, by the way that thermal vias is arranged, is convenient for cooling and shaping.
Compared with prior art, the invention has the following advantages:
(1) by extexine, middle layer and the setting of endosexine, so that the enging cabin fuel pump the cover extexine hard
Skinning had both been able to satisfy appearance demand, had sound insulation value, middle layer and endosexine have sound absorption function, and can reach reduction noise
Effect has used the vehicle noise of fuel pump the cover that can reduce by 2~3Db by test.
(2) automobile engine nacelle has the ageing-resistant fire-retardant characteristic of high temperature with fire resistant sound-absorbing damping part, from fire
Self-gravitation can directly wrap up the component to work under hot environment.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment 1
A kind of automobile engine nacelle fuel pump the cover matches with the fuel pump shape of enging cabin, and the cover is directly right
Engine components are wrapped up, especially the engine components such as high pressure fuel pump and high pressure fuel rail, do not need to be arranged again individually
The cover.The fuel pump the cover be Multi-component Polyurethane foaming structure, including extexine, endosexine and be located at extexine and Nei Biao
Middle layer between layer, extexine are hard skinning, and endosexine is soft skinning, and middle layer is the soft bubble material layers of aperture.Hard
Skinning with a thickness of 3mm, soft skinning with a thickness of 0.5mm, the density of the soft bubble material layers of aperture is 120kg/m3。
The preparation method of the automobile engine nacelle fuel pump the cover needs two secondary molding dies, two one-step formings: this method packet
Include following steps:
A) formable layer in: by the foaming raw material of internal layer in interior formable layer mold foaming, the internal layer shaping mould
Tool includes upper die and lower die, and wherein upper die and lower die match the internal layer cavity to be formed and be matched with the shape of fuel pump extexine,
Forming step is as follows:
(a-1) control lower die temperature is 50 DEG C and keeps the temperature；
(a-2) control upper mold temperature is 50 DEG C and keeps the temperature；
(a-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by 68.9wt%'s
The isocyanates of polyethers and 31.1wt% composition, wherein polyethers uses surface functionality 2~3, and molecular weight 1000~5000 gathers
Ether, and the physical blowing agent pentamethylene in polyethers containing 8wt%；
(a-4) aqueous release agent is sprayed in upper mold, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-5) aqueous release agent is sprayed in lower die, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-6) set high pressure foaming machine casting flow as 22~30g/s, control the duration of pouring, by storing fill in foaming
Raw material injects foam chamber in proportion；
(a-7) it is closed upper mold and lower die, internal pressure is controlled in 0.4MPa, and curing temperature is 50 DEG C, molding time is
120s makes foaming raw material foam, cure, form in foam chamber；
(a-8) mold is opened, endosexine part blank is obtained；
(a-9) overlap of internal layer part blank is removed；
B) outer formable layer: will be mounted on the mold core of outer layer molding die by the molding internal layer blank of step a), outer layer
Foaming raw material foaming, outer layer molding die in outer formable layer mold include upper die and lower die, mold core, and forming step is as follows:
(b-1) control lower die temperature is 50 DEG C and keeps the temperature；
(b-2) control upper mold temperature is 75 DEG C and keeps the temperature；
(b-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by 58.3wt%'s
The isocyanates of polyethers and 41.7wt% composition, wherein polyethers uses surface functionality 2~3, and molecular weight 2000~6000 gathers
Ether；
(b-4) solvent release agent is sprayed in upper mold, using methylene chloride as solvent, effective component is paraffin；
(b-5) solvent release agent is sprayed in lower die, using methylene chloride as solvent, effective component is paraffin；
(b-6) internal layer blank is installed on mold core；
(b-7) set high pressure foaming machine casting flow as 40~45g/s, control the duration of pouring, by storing fill in foaming
Raw material injects foam chamber in proportion；
(b-8) it is closed upper mold and lower die, in 0.4MPa, curing temperature is 45 DEG C of lower die for internal pressure control, 75 DEG C of upper mold,
Molding time is 300s, and foaming raw material is made to foam, cure, form in foam chamber；
(b-9) mold is opened, fuel pump hood feature blank is obtained；
(b-10) fuel pump hood feature blank is put into cooling shaping fixture, natural cooling 100 seconds or more；
(b-11) overlap of fuel pump hood feature blank is removed, be by the fuel pump hood feature blank after checking
For fuel pump hood feature.In order to guarantee that the consistency of product appearance, part whole process are produced using manipulator.
Embodiment 2
A kind of automobile engine nacelle fuel pump the cover matches with the fuel pump shape of enging cabin, and the cover is directly right
Engine components are wrapped up, especially the engine components such as high pressure fuel pump and high pressure fuel rail, do not need to be arranged again individually
The cover.The fuel pump the cover be Multi-component Polyurethane foaming structure, including extexine, endosexine and be located at extexine and Nei Biao
Middle layer between layer, extexine are hard skinning, and endosexine is soft skinning, and middle layer is the soft bubble material layers of aperture.Hard
Skinning with a thickness of 2mm, soft skinning with a thickness of 0.3mm, the density of the soft bubble material layers of aperture is 160kg/m3。
The preparation method of the automobile engine nacelle fuel pump the cover needs two secondary molding dies, two one-step formings: this method packet
Include following steps:
A) formable layer in: by the foaming raw material of internal layer in interior formable layer mold foaming, the internal layer shaping mould
Tool includes upper die and lower die, and wherein upper die and lower die match the internal layer cavity to be formed and be matched with the shape of fuel pump extexine,
Forming step is as follows:
(a-1) control lower die temperature is 55 DEG C and keeps the temperature；
(a-2) control upper mold temperature is 55 DEG C and keeps the temperature；
(a-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by 70.3wt%'s
The isocyanates of polyethers and 29.7wt% composition, wherein polyethers uses surface functionality 2~3, and molecular weight 1000~5000 gathers
Ether, and the LBA foaming agent in polyethers containing 8wt%；
(a-4) aqueous release agent is sprayed in upper mold, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-5) aqueous release agent is sprayed in lower die, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-6) set high pressure foaming machine casting flow as 22~30g/s, control the duration of pouring, by storing fill in foaming
Raw material injects foam chamber in proportion；
(a-7) it is closed upper mold and lower die, internal pressure is controlled in 0.4MPa, and curing temperature is 55 DEG C, molding time is
150s makes foaming raw material foam, cure, form in foam chamber；
(a-8) mold is opened, endosexine part blank is obtained；
(a-9) overlap of internal layer part blank is removed；
B) outer formable layer: will be mounted on the mold core of outer layer molding die by the molding internal layer blank of step a), outer layer
Foaming raw material foaming, outer layer molding die in outer formable layer mold include upper die and lower die, mold core, and forming step is as follows:
(b-1) control lower die temperature is 48 DEG C and keeps the temperature；
(b-2) control upper mold temperature is 80 DEG C and keeps the temperature；
(b-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by 59.5wt%'s
The isocyanates of polyethers and 40.5wt% composition, wherein polyethers uses surface functionality 2~3, and molecular weight 2000~6000 gathers
Ether；
(b-4) solvent release agent is sprayed in upper mold, using methylene chloride as solvent, effective component is paraffin；
(b-5) solvent release agent is sprayed in lower die, using methylene chloride as solvent, effective component is paraffin；
(b-6) internal layer blank is installed on mold core；
(b-7) set high pressure foaming machine casting flow as 40~45g/s, control the duration of pouring, by storing fill in foaming
Raw material injects foam chamber in proportion；
(b-8) it is closed upper mold and lower die, in 0.4MPa, curing temperature is 50 DEG C of lower die for internal pressure control, 80 DEG C of upper mold,
Molding time is 250s, and foaming raw material is made to foam, cure, form in foam chamber；
(b-9) mold is opened, fuel pump hood feature blank is obtained；
(b-10) fuel pump hood feature blank is put into cooling shaping fixture, natural cooling 100 seconds or more, tooling had
The support portion to fit with part blank bottom surface is furnished with thermal vias on the support portion；
(b-11) overlap for removing fuel pump hood feature blank examines part blank by automated image identification
It surveys, photosampling archive is carried out in each position of qualified parts by using industrial camera, and set pixel deviations range, in phase
With under light source, using pixel control methods, part blank is detected, if pixel deviations model of the testing result beyond setting
It encloses, then part blank is unqualified, if testing result, in deviation range, part passes through the fuel oil after checking by detection
Pumping hood feature blank is fuel pump hood feature.In order to guarantee that the consistency of product appearance, part whole process use manipulator
It is produced, is engine PUR Decorative Cover by the part blank after detection.
Embodiment 3
A kind of automobile engine nacelle fuel pump the cover matches with the fuel pump shape of enging cabin, and the cover is directly right
Engine components are wrapped up, especially the engine components such as high pressure fuel pump and high pressure fuel rail, do not need to be arranged again individually
The cover.The fuel pump the cover be Multi-component Polyurethane foaming structure, including extexine, endosexine and be located at extexine and Nei Biao
Middle layer between layer, extexine are hard skinning, and endosexine is soft skinning, and middle layer is the soft bubble material layers of aperture.Hard
Skinning with a thickness of 1.5mm, soft skinning with a thickness of 0.35mm, the density of the soft bubble material layers of aperture is 180kg/m3。
The preparation method of the automobile engine nacelle fuel pump the cover needs two secondary molding dies, two one-step formings: this method packet
Include following steps:
A) formable layer in: by the foaming raw material of internal layer in interior formable layer mold foaming, the internal layer shaping mould
Tool includes upper die and lower die, and wherein upper die and lower die match the internal layer cavity to be formed and be matched with the shape of fuel pump extexine,
Forming step is as follows:
(a-1) control lower die temperature is 55 DEG C and keeps the temperature；
(a-2) control upper mold temperature is 55 DEG C and keeps the temperature；
(a-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by 72.5wt%'s
The isocyanates of polyethers and 27.5wt% composition, wherein polyethers uses surface functionality 2~3, and molecular weight 1000~5000 gathers
Ether, and the LBA foaming agent in polyethers containing 8wt%；
(a-4) aqueous release agent is sprayed in upper mold, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-5) aqueous release agent is sprayed in lower die, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-6) set high pressure foaming machine casting flow as 25~30g/s, control the duration of pouring, by storing fill in foaming
Raw material injects foam chamber in proportion；
(a-7) it is closed upper mold and lower die, internal pressure is controlled in 0.5MPa, and curing temperature is 55 DEG C, molding time is
150s makes foaming raw material foam, cure, form in foam chamber；
(a-8) mold is opened, endosexine part blank is obtained；
(a-9) overlap of internal layer part blank is removed；
B) outer formable layer: will be mounted on the mold core of outer layer molding die by the molding internal layer blank of step a), outer layer
Foaming raw material foaming, outer layer molding die in outer formable layer mold include upper die and lower die, mold core, and forming step is as follows:
(b-1) control lower die temperature is 50 DEG C and keeps the temperature；
(b-2) control upper mold temperature is 85 DEG C and keeps the temperature；
(b-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by 56.7wt%'s
The isocyanates of polyethers and 43.3wt% composition, wherein polyethers uses surface functionality 2~3, and molecular weight 2000~6000 gathers
Ether；
(b-4) solvent release agent is sprayed in upper mold, using methylene chloride as solvent, effective component is paraffin；
(b-5) solvent release agent is sprayed in lower die, using methylene chloride as solvent, effective component is paraffin；
(b-6) internal layer blank is installed on mold core；
(b-7) set high pressure foaming machine casting flow as 40~45g/s, control the duration of pouring, by storing fill in foaming
Raw material injects foam chamber in proportion；
(b-8) it is closed upper mold and lower die, in 0.4MPa, curing temperature is 50 DEG C of lower die for internal pressure control, 80 DEG C of upper mold,
Molding time is 250s, and foaming raw material is made to foam, cure, form in foam chamber；
(b-9) mold is opened, fuel pump hood feature blank is obtained；
(b-10) fuel pump hood feature blank is put into cooling shaping fixture, natural cooling 100 seconds or more；
(b-11) overlap for removing fuel pump hood feature blank examines part blank by automated image identification
It surveys, photosampling archive is carried out in each position of qualified parts by using industrial camera, and set pixel deviations range, in phase
With under light source, using pixel control methods, part blank is detected, if pixel deviations model of the testing result beyond setting
It encloses, then part blank is unqualified, if testing result, in deviation range, part passes through the fuel oil after checking by detection
Pumping hood feature blank is fuel pump hood feature.In order to guarantee that the consistency of product appearance, part whole process use manipulator
It is produced, is engine PUR Decorative Cover by the part blank after detection.
Embodiment 4
Fuel pump the cover in automobile engine nacelle matches with the shape of fuel pump, which is double-layer structure,
The hard skinning that outer layer is is Multi-component Polyurethane foaming structure, and with a thickness of 1mm, internal layer is with a thickness of 0.1mm, for endosexine
Middle layer between the endosexine and connection outer layer and endosexine of soft skinning, middle layer are to add the Multi-component Polyurethane of graphite
Foaming structure, density 120kg/m3。
The preparation method of the automobile engine nacelle fuel pump the cover needs two secondary molding dies, two one-step formings: this method packet
Include following steps:
A) formable layer in: by the foaming raw material of internal layer in interior formable layer mold foaming, the internal layer shaping mould
Tool includes upper die and lower die, and wherein upper die and lower die match the internal layer cavity to be formed and be matched with the shape of fuel pump extexine,
Forming step is as follows:
(a-1) control lower die temperature is 50 DEG C and keeps the temperature；
(a-2) control upper mold temperature is 50 DEG C and keeps the temperature；
(a-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by following percentage
The group of content is grouped as: polyethers 68wt%, isocyanates 32wt%, the also physical blowing agent ring penta containing 8wt% in polyethers
Alkane；
(a-4) aqueous release agent is sprayed in upper mold, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-5) aqueous release agent is sprayed in lower die, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-6) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(a-7) it is closed upper mold and lower die, for the control of control internal pressure in 0.5MPa, curing temperature is 50 DEG C, molding time
For 120s, foaming raw material is made to foam, cure, form in foam chamber；
(a-8) mold is opened, endosexine part blank is obtained；
(a-9) overlap of internal layer part blank is removed；
B) outer formable layer: will be mounted on the mold core of outer layer molding die by the molding internal layer blank of step a), outer layer
Foaming raw material foaming, outer layer molding die in outer formable layer mold include upper die and lower die, mold core, and forming step is as follows:
(b-1) control lower die temperature is 45 DEG C and keeps the temperature；
(b-2) control upper mold temperature is 75 DEG C and keeps the temperature；
(b-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by following percentage
The group of content is grouped as: polyethers 55wt%, isocyanates 45wt%；
(b-4) solvent release agent is sprayed in upper mold, for solvent release agent using methylene chloride as solvent, effective component is stone
Wax；
(b-5) solvent release agent is sprayed in lower die, for solvent release agent using methylene chloride as solvent, effective component is stone
Wax；
(b-6) internal layer blank is installed on mold core；
(b-7) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(b-8) it is closed upper mold and lower die, in 0.5MPa, curing temperature is 50 DEG C of lower die for internal pressure control, 75 DEG C of upper mold,
Molding time is 240s, and foaming raw material is made to foam, cure, form in foam chamber；
(b-9) mold is opened, fuel pump hood feature blank is obtained；
(b-10) fuel pump hood feature blank is put into cooling shaping fixture, natural cooling 100 seconds or more, cooling and shaping
Tooling has the support portion to fit with part blank bottom surface, is furnished with thermal vias on the support portion；
(b-11) overlap for removing fuel pump hood feature blank, obtains fuel pump the cover.
Embodiment 5
Fuel pump the cover in automobile engine nacelle matches with the shape of fuel pump, which is double-layer structure,
The hard skinning that outer layer is is Multi-component Polyurethane foaming structure, and with a thickness of 3mm, internal layer is with a thickness of 0.5mm, for endosexine
Middle layer between the endosexine and connection outer layer and endosexine of soft skinning, middle layer are to add the Multi-component Polyurethane of graphite
Foaming structure, density 200kg/m3。
The preparation method of the automobile engine nacelle fuel pump the cover needs two secondary molding dies, two one-step formings: this method packet
Include following steps:
A) formable layer in: by the foaming raw material of internal layer, foaming, internal layer molding die include in interior formable layer mold
Upper die and lower die, wherein upper die and lower die match the internal layer cavity to be formed and be matched with the shape of fuel pump extexine, molding step
It is rapid as follows:
(a-1) control lower die temperature is 60 DEG C and keeps the temperature；
(a-2) control upper mold temperature is 60 DEG C and keeps the temperature；
(a-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by following percentage
The group of content is grouped as: polyethers 73wt%, isocyanates 27wt%, the also physical blowing agent ring penta containing 8wt% in polyethers
Alkane；
(a-4) aqueous release agent is sprayed in upper mold, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-5) aqueous release agent is sprayed in lower die, aqueous release agent takes water as a solvent, and effective component is silicone substance；
(a-6) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(a-7) it is closed upper mold and lower die, internal pressure is controlled in 0.5MPa, and curing temperature is 60 DEG C, molding time is
180s makes foaming raw material foam, cure, form in foam chamber；
(a-8) mold is opened, endosexine part blank is obtained；
(a-9) overlap of internal layer part blank is removed；
B) outer formable layer: will be mounted on the mold core of outer layer molding die by the molding internal layer blank of step a), outer layer
Foaming raw material foaming, outer layer molding die in outer formable layer mold include upper die and lower die, mold core, and forming step is as follows:
(b-1) control lower die temperature is 50 DEG C and keeps the temperature；
(b-2) control upper mold temperature is 85 DEG C and keeps the temperature；
(b-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine, foaming raw material is by following percentage
The group of content is grouped as: polyethers 55wt%, isocyanates 45wt%；
(b-4) solvent release agent is sprayed in upper mold, for solvent release agent using methylene chloride as solvent, effective component is stone
Wax；
(b-5) solvent release agent is sprayed in lower die, for solvent release agent using methylene chloride as solvent, effective component is stone
Wax；
(b-6) internal layer blank is installed on mold core；
(b-7) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(b-8) it is closed upper mold and lower die, in 0.5MPa, curing temperature is 50 DEG C of lower die for internal pressure control, 85 DEG C of upper mold,
Molding time is 300s, and foaming raw material is made to foam, cure, form in foam chamber；
(b-9) mold is opened, fuel pump hood feature blank is obtained；
(b-10) fuel pump hood feature blank is put into cooling shaping fixture, natural cooling 100 seconds or more, cooling and shaping
Tooling has the support portion to fit with part blank bottom surface, is furnished with thermal vias on the support portion；
(b-11) overlap for removing fuel pump hood feature blank, obtains fuel pump the cover.
It is had the following performance using the prepared product of the above method
It is fire-retardant: to be ceased certainly from fire；
Tensile strength: >=80kpa
Elongation at break: >=80%
Tearing strength: >=200N/m
Heat-resisting quantity: it 150 DEG C, stores 168 hours, product is without exception；
100% waterproof of outer surface.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (10)
1. fuel pump the cover in a kind of automobile engine nacelle, matches with the shape of fuel pump, which is characterized in that the fuel pump cover
Lid is double-layer structure, and the hard skinning that outer layer is, internal layer is the endosexine that endosexine is soft skinning and connection outer layer and interior table
Middle layer between layer.
2. fuel pump the cover in a kind of automobile engine nacelle according to claim 1, which is characterized in that the outer layer is
Multi-component Polyurethane foaming structure.
3. fuel pump the cover in a kind of automobile engine nacelle according to claim 1, which is characterized in that the middle layer
For the Multi-component Polyurethane foaming structure for adding graphite.
4. fuel pump the cover in a kind of automobile engine nacelle according to claim 1, which is characterized in that the outer layer
With a thickness of 1~3mm, the endosexine with a thickness of 0.1~0.5mm, the density of the middle layer is 120~200kg/
m3。
5. the production method of fuel pump the cover in automobile engine nacelle as described in claim 1, which is characterized in that this method is logical
It crosses two width molds and carries out two one-step formings, using following steps:
A) formable layer in: by the foaming raw material of internal layer in interior formable layer mold foaming, the internal layer molding die packet
Upper die and lower die are included, wherein upper die and lower die match the internal layer cavity to be formed and be matched with the shape of fuel pump extexine, molding
Steps are as follows:
(a-1) control lower die temperature is 50~60 DEG C and keeps the temperature；
(a-2) control upper mold temperature is 50~60 DEG C and keeps the temperature；
(a-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine；
(a-4) aqueous release agent is sprayed in upper mold；
(a-5) aqueous release agent is sprayed in lower die；
(a-6) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(a-7) it is closed upper mold and lower die, foaming raw material is made to foam, cure, form in foam chamber；
(a-8) mold is opened, endosexine part blank is obtained；
(a-9) overlap of internal layer part blank is removed；
B) outer formable layer: will be by the molding internal layer blank of step a) on the mold core of outer layer molding die, the foaming of outer layer
Raw material foaming, outer layer molding die in outer formable layer mold include upper die and lower die, mold core, and forming step is as follows:
(b-1) control lower die temperature is 45~50 DEG C and keeps the temperature；
(b-2) control upper mold temperature is 75~85 DEG C and keeps the temperature；
(b-3) foaming raw material is separately added into the corresponding storage tank of high pressure foaming machine；
(b-4) solvent release agent is sprayed in upper mold；
(b-5) solvent release agent is sprayed in lower die；
(b-6) internal layer blank is installed on mold core；
(b-7) by storing fill in foaming raw material injected in the foam chamber formed between upper mold and lower die in proportion；
(b-8) it is closed upper mold and lower die, foaming raw material is made to foam, cure, form in foam chamber；
(b-9) mold is opened, fuel pump hood feature blank is obtained；
(b-10) fuel pump hood feature blank is put into cooling shaping fixture, natural cooling 100 seconds or more；
(b-11) overlap for removing fuel pump hood feature blank, obtains fuel pump the cover.
6. the production method of fuel pump the cover in a kind of automobile engine nacelle according to claim 5, which is characterized in that
The foaming raw material of the outer layer is grouped as by the group of following degree: 55~60wt% of polyethers, isocyanates 45
~40wt%,
The foaming raw material of the internal layer is grouped as by the group of following degree: 68~73wt% of polyethers, isocyanates 32
~27wt%, also containing the physical blowing agent of 8wt% in polyethers.
7. the production method of fuel pump the cover in a kind of automobile engine nacelle according to claim 6, which is characterized in that institute
The physical blowing agent stated is pentamethylene or LBA foaming agent.
8. the production method of fuel pump the cover in a kind of automobile engine nacelle according to claim 5, which is characterized in that institute
The aqueous release agent stated takes water as a solvent, and effective component is silicone substance, and the solvent release agent is with methylene chloride
Solvent, effective component are paraffin.
9. the production method of fuel pump the cover in a kind of automobile engine nacelle according to claim 5, which is characterized in that
In step (a-7) after closure upper mold and lower die, internal pressure control in 0.4~0.5MPa, curing temperature is 50-60 DEG C,
Molding time is 120s~180s；
In step (b-8) after closure upper mold and lower die, internal pressure control in 0.4~0.5MPa, curing temperature be lower die 45~
50 DEG C, 75-85 DEG C of upper mold, molding time is 240s~300s.
10. the production method of fuel pump the cover in a kind of automobile engine nacelle according to claim 5, which is characterized in that
The cooling shaping fixture has the support portion to fit with part blank bottom surface, is furnished with thermal vias on the support portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711185931.3A CN109826785A (en) | 2017-11-23 | 2017-11-23 | Fuel pump the cover and preparation method thereof in a kind of automobile engine nacelle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711185931.3A CN109826785A (en) | 2017-11-23 | 2017-11-23 | Fuel pump the cover and preparation method thereof in a kind of automobile engine nacelle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109826785A true CN109826785A (en) | 2019-05-31 |
Family
ID=66859371
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711185931.3A Pending CN109826785A (en) | 2017-11-23 | 2017-11-23 | Fuel pump the cover and preparation method thereof in a kind of automobile engine nacelle |
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| CN (1) | CN109826785A (en) |
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| CN110318872A (en) * | 2019-06-20 | 2019-10-11 | 浙江众泰汽车制造有限公司 | Reduced noise engine Decorative Cover and its Noise Testing |
| CN110425041A (en) * | 2019-06-20 | 2019-11-08 | 浙江众泰汽车制造有限公司 | A kind of automobile engine trim cover and its Noise Testing |
| CN114228029A (en) * | 2021-10-27 | 2022-03-25 | 江西行新汽车科技股份有限公司 | Production process of silencing engine cover |
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Application publication date: 20190531 |