CN111168973B - Flame-retardant plastic oil collection bottle for aviation, forming process and blow molding forming equipment thereof - Google Patents
Flame-retardant plastic oil collection bottle for aviation, forming process and blow molding forming equipment thereof Download PDFInfo
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- CN111168973B CN111168973B CN202010115758.5A CN202010115758A CN111168973B CN 111168973 B CN111168973 B CN 111168973B CN 202010115758 A CN202010115758 A CN 202010115758A CN 111168973 B CN111168973 B CN 111168973B
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/16—Biaxial stretching during blow-moulding using pressure difference for pre-stretching, e.g. pre-blowing
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/28—Blow-moulding apparatus
- B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
- B29C49/38—Blow-moulding apparatus having movable moulds or mould parts mounted on movable endless supports
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/58—Blowing means
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/783—Measuring, controlling or regulating blowing pressure
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N19/00—Lubricant containers for use in lubricators or lubrication systems
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2079/00—Use of polymers having nitrogen, with or without oxygen or carbon only, in the main chain, not provided for in groups B29K2061/00 - B29K2077/00, as moulding material
- B29K2079/08—PI, i.e. polyimides or derivatives thereof
- B29K2079/085—Thermoplastic polyimides, e.g. polyesterimides, PEI, i.e. polyetherimides, or polyamideimides; Derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses an aviation flame-retardant plastic oil collection bottle, a molding process and blow molding equipment thereof, and belongs to the technical field of aviation onboard equipment. Its former includes: the device comprises an annular assembly line, a die carrier arranged on the annular assembly line, and a die temperature controller arranged on the die carrier; the air blowing head controller is arranged on the air blowing head; the molding is carried out by adopting an injection-drawing-blowing process. The invention provides the airborne system oil collection bottle which can simultaneously meet the requirements of corrosion resistance, fire resistance, transparency, light weight, non-central symmetry and airborne environment reliability by improving three aspects of material selection, mold design and molding process.
Description
Technical Field
The invention belongs to the technical field of airborne equipment, and particularly relates to an aviation flame-retardant plastic oil collection bottle, a molding process and blow molding equipment thereof.
Background
At present, the liquid collecting device of the domestic aviation onboard system mainly has the following technical requirements: 1. resists the corrosion of aviation hydraulic oil (GJB 1177-1991) and lubricating oil (GJB 135A-1998); 2. the temperature of the working environment is satisfied: -55 ℃ to +70 ℃; 3. has the fireproof function: under the condition that fire occurs inside or outside the equipment, flame cannot spread; 4. and the reliability requirement of the airborne environment is met.
The oil collecting bottle of the existing domestic airborne system is made of aluminum alloy, can meet the technical requirements of corrosion resistance, temperature resistance, fire prevention and the like, but has two defects which cannot be overcome: the first is weight, the density of the aluminum alloy is 2.7 g/cubic centimeter, and the oil collecting bottle made of the aluminum alloy has heavier weight; the second is that the collection oil bottle of aluminum alloy material is opaque, and ground service maintainer can't observe the liquid level height in the bottle, has increased the maintenance degree of difficulty.
To solve the problems of weight and transparency, the best method is to use transparent or semitransparent nonmetal materials to manufacture the oil collecting bottle. For example, similar devices for boeing 737 series aircraft are made of HDPE (high density polyethylene) and are formed by blow molding. The existing materials for blow molding are HDPE, PET, PP, PC, etc., but these materials have a common drawback: the flame-retardant material is not flame-retardant, and cannot meet the fire-proof requirement of the domestic airplane on airborne equipment. If the materials meet the requirement of airborne flame retardance, a flame retardant is required to be added, and the adding proportion is not less than 30%. The consequence of the addition of flame retardants is a reduction in the toughness of the material and the failure to withstand high gas pressures during blow molding.
In addition, in order to meet the requirement of installation reliability, the cross section of the external shape of the onboard oil collection bottle is required to be square but not circular. The square is a non-centrosymmetric figure, and belongs to a special shape in the blow molding process, and the strokes of blow molding air flow reaching each point on the surface of the bottle tire are different, so that the process molding difficulty is increased.
Disclosure of Invention
The invention aims to: the flame-retardant plastic oil collecting bottle for aviation, the molding process thereof and blow molding equipment are provided to solve the problems involved in the background art.
The technical scheme is as follows: a forming process of an aviation flame-retardant plastic oil collection bottle comprises the following steps:
s1, injection molding, namely injecting molten plastic into an injection mold through an injection molding device, and forming a transparent bottle tire with a bottom through rapid cooling;
s2, stretching, namely keeping the mold temperature of a stretching mold constant through a heating device, and stretching the bottle blank to a preset ratio through the stretching mold;
and S3, blow molding, namely keeping the mold temperature of the blow mold constant through a heating device, and then introducing compressed air into a blowing head to obtain the required transparent hollow oil collecting bottle.
In a further embodiment, in the injection molding process, the demolding height of the bottle blank is increased by 2 to 5cm compared with a target size.
In a further embodiment, in the stretching and blow molding process, the mold temperature is maintained to be not lower than 150 ℃, not higher than 170 ℃, and the temperature of the blowing head is maintained uniform.
In a further embodiment, the blowing ratio is controlled by a blowing head controller above the blowing head, wherein the blowing ratio is controlled to be 2.5-3.0, and the traction ratio is controlled to be 4-6.
In a further embodiment, the plastic melt is a polyetherimide material melt or a polyetherimide material melt mixed with glass fibers and carbon fibers.
In a further embodiment, the blow molding process adopts a sectional blow molding process, and the wall thickness is relatively consistent through 2 to 3 times of blow molding.
The invention also provides an oil collecting bottle prepared based on the molding process of the aviation flame-retardant plastic oil collecting bottle, which comprises the following steps: the bottle comprises a bottle mouth in an inverted splayed shape and a bottle body in a quadrangular shape, wherein the bottle mouth and the bottle body are in an integrally formed structure; wherein the diameter of the mouth part of the oil collecting bottle is 20-45 mm, the diameter of the bottom part of the oil collecting bottle is 50-80 mm, the oil collecting bottle is non-centrosymmetric in shape, and the stretching ratio from the bottle body to the bottle body reaches 1.
In a further embodiment, the stretch ratio of the carcass to body conforms to the following mathematical model: δ = N +0.5 × (R/R), where δ is the bottle bead bottom dimension, N is the bottle bead wall dimension, R is the bottle body dimension, and R is the bottle mouth dimension.
The invention also provides blow molding equipment based on the molding process of the aviation flame-retardant plastic oil collection bottle, which comprises the following steps: the device comprises a production line, a grinding tool assembly and a blow molding assembly.
The circular assembly line is circularly conveyed, and a plurality of drying channels are arranged on the assembly line, so that the conveying time of the bottle blanks exposed in the air is less than 12 seconds.
The mould assembly comprises a mould frame arranged on the annular assembly line and a mould temperature controller arranged on the mould frame.
The blow molding assembly comprises air pressurization equipment erected on the annular production line, a blowing head connected with the air pressurization equipment, and a blowing head controller arranged on the blowing head.
In a further embodiment, the blowing head controller includes: the device comprises a flow sensor for measuring the flow of gas flowing in a blowing head, pressure sensors for measuring the upstream and downstream of the blowing head, a single chip microcomputer in signal connection with the pressure sensors and the flow sensors, and an electromagnetic valve for controlling the opening degree of the flow; the opening size of the electromagnetic valve accords with the following mathematical model:
wherein the content of the first and second substances,
the flow opening of the electromagnetic valve, namely the instantaneous flow;
is the standard error, i.e., the difference between the flow set point and the measured value measured by the flow sensor;
respectively the pressure values measured by the pressure sensors at the upstream and the downstream of the blowing head,
reaction interval of the blowing head; A. b, C, D is the adjustment factor;
the blowing ratio is taken out according to a specific process;
time taken for the blow molding stage;
is not inflatedVolume of the bottle.
Has the advantages that: the invention relates to an aviation flame-retardant plastic oil collection bottle, a molding process and blow molding equipment thereof, which have the following advantages compared with the prior art:
1. the material is selected, a Polyetherimide (PEI) material is selected as a matrix material, the density of the material is 1.2 g/cubic centimeter, V0-level flame retardance can be achieved without adding a flame retardant, the material is transparent, the tensile strength is high, and the material characteristics meet the reliability requirements of an airborne environment. PEI has excellent physicochemical properties.
2. The design of the mold, the injection-drawing-blowing process is adopted for the product, and based on the material characteristics of PEI, the product is difficult to form if the traditional mold design method is adopted, so the design of the bottle tire injection mold is improved, and the bottom size of the bottle tire is thickened.
3. The process is innovative, the forming process and equipment are improved, the proper grinding tool temperature, the blowing ratio, the traction ratio, the additive addition and the like are selected for improvement, and the problems that the bottle tire is hardened due to the reduction of the surface temperature, the blowing difficulty is increased, and the bottle body is not uniformly expanded or the forming is incomplete are solved.
Drawings
Fig. 1 is a schematic view showing the shape of an oil collection bottle according to the present invention.
FIG. 2 is a schematic view of the blow molding apparatus of the present invention.
Fig. 3 is a schematic diagram of the structure of the ring pipeline of the present invention.
The reference signs are: the device comprises a blowing head controller 1, a blowing head 2, a mold temperature controller 3, a mold base 4, an annular assembly line 5, a drying channel 6 and air supercharging equipment 7.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
Because, domestic aviation airborne system liquid collecting device mainly has following technical requirement: 1. resists the corrosion of aviation hydraulic oil (GJB 1177-1991) and lubricating oil (GJB 135A-1998); 2. the temperature of the working environment is satisfied: -55 ℃ to +70 ℃; 3. has the fireproof function: under the condition that fire occurs inside or outside the equipment, flame cannot spread; 4. and the reliability requirement of the airborne environment is met. That is, the invention has the key requirements of light weight, corrosion resistance, fire resistance, transparency, non-centrosymmetric appearance, and capability of meeting the reliability requirements of high temperature resistance, low impact vibration resistance, service life of 30 years and other airborne environments.
To meet the above requirements, the applicant has devised a collector bottle comprising: the bottle comprises a bottle mouth in an inverted splayed shape and a bottle body in a quadrangular shape, wherein the bottle mouth and the bottle body are in an integrally formed structure; wherein the diameter of the mouth part of the oil collecting bottle is 20-45 mm, the diameter of the bottom part of the oil collecting bottle is 50-80 mm, the oil collecting bottle is non-centrosymmetric in shape, and the stretching ratio from the bottle tire to the bottle body reaches 1.
Preferably, the oil collecting bottle adopts a polyetherimide material melt or a polyetherimide material mixed with glass fibers and carbon fibers.
As a preferred solution, the stretch ratio of the bottle body to the bottle body conforms to the following mathematical model: δ = N +0.5 × (R/R), where δ is the bottle bead bottom dimension, N is the bottle bead wall dimension, R is the bottle body dimension, and R is the bottle mouth dimension.
The finished product is produced by adopting an injection-drawing-blowing process through the product, wherein the three process steps are respectively provided with a set of die: bottle base injection mould, bottle base drawing die, body blowing mould. The specific forming process comprises the following steps:
s1, injection molding, namely injecting molten plastic into an injection mold through an injection molding device, and forming a transparent bottle tire with a bottom through rapid cooling;
s2, stretching, namely keeping the mold temperature of a stretching mold constant through a heating device, and stretching the bottle blank to a preset ratio through the stretching mold;
and S3, blow molding, namely keeping the mold temperature of the blow mold constant through a heating device, and then introducing compressed air into the blowing head 2 to obtain the required transparent hollow oil collecting bottle.
Firstly, through analysis experiments, the applicant selects Polyetherimide (PEI) material as a base material, the density of the material is 1.2 g/cubic centimeter, V0 level flame retardance can be achieved without adding a flame retardant, the material is transparent, the tensile strength is high, and the material characteristics meet the reliability requirement of airborne environment. PEI has the following excellent physicochemical properties:
1) And excellent thermal stability, and the initial decomposition temperature is generally about 400 ℃. Polyimide synthesized from biphenyl dianhydride and p-phenylenediamine has a thermal decomposition temperature of 600 ℃, and is one of the highest heat-stable varieties of polymers.
2) And is resistant to very low temperatures, such as-269 ℃ in liquid helium.
3) The film has excellent mechanical performance, the tensile strength of unfilled plastic is over 100MPa, the film of the pyromellitic polyimide (Kapton) is over 170MPa, and the film of the biphenyl polyimide (Upilex S) reaches 400MPa. As engineering plastics, the elastic film amount is usually 3-4Gpa, the fiber can reach 200Gpa, and the fiber synthesized by the pyromellitic dianhydride and the p-phenylenediamine can reach 500Gpa theoretically, which is only second to the carbon fiber.
4) The polyimide is insoluble in organic solvents, stable to dilute acid and not very hydrolysis-resistant in general varieties, but has the performance similar to the defect that polyimide has a great characteristic different from other high-performance polymers, namely, the dianhydride and the diamine which are raw materials can be recycled by alkaline hydrolysis, for example, for a Kapton film, the recovery rate can reach 80-90%. The structure is changed to obtain a variety which is quite resistant to hydrolysis, such as the variety can withstand water boiling for 500 hours at 120 ℃.
5) The thermal expansion coefficient is 2X 10-5-3X 10-5 deg.C, the thermoplastic polyimide is 3X 10-5 deg.C, the biphenyl type can reach 10-6 deg.C, and the individual variety can reach 10-7 deg.C.
6) The film has high radiation resistance, and the strength retention rate of the film after 5X 109rad fast electron irradiation is 90 percent.
7) Polyimide is a self-extinguishing polymer and has a low fuming rate.
9) And the air release amount under extremely high vacuum is very little.
10 Non-toxic, can be used to make tableware and medical instruments, and can withstand thousands of sterilizations.
In the further implementation process, the brittle fracture phenomenon of the part of oil collection bottle products is easily caused by the wall thinness in the actual production process, therefore, the applicant adds an additive into the plastic melt to improve the strength of the products, specifically, adds a small amount of glass fiber and carbon fiber into the polyetherimide material melt to improve the brittle fracture phenomenon of the products caused by the wall thinness.
Based on the material characteristics of PEI, the product is difficult to form if a traditional mold design method is adopted. As shown in the drawing, the product has a mouth of 32mm diameter and a base of 70mm diameter and is not centrosymmetric in shape, and in the blow molding process, the structure shows that the stretch ratio from the bottle body to the bottle body reaches 1.19, and for PEI, a material with high viscosity, the stretch ratio exceeds 1.2 and the shape non-centrosymmetry is unprecedented, and the excessive stretch ratio can cause the bottle body to be broken by high-pressure gas. Therefore, the design of the bottle tire injection mold is improved, and the bottom size of the bottle tire is thickened. Through experiments, we summarize the calculation method of the size: δ = N +0.5 × (R/R), where δ is the bottle bead bottom dimension, N is the bottle bead wall dimension, R is the bottle body dimension, and R is the bottle mouth dimension. Because the bottle body is not centrosymmetric, the peripheral wall thickness and the upper and lower wall thicknesses are inconsistent in the stretching process, so that the wall thickness is relatively consistent by adopting a segmented blow molding process and performing blow molding for 2 times in the bottle blowing process, and the local over-thickness or over-thin is avoided.
For the reasons, in order to obtain a thicker bottle blank bottom, in the injection molding process, the demolding height of the bottle blank is increased by 2 to 5cm compared with a target size.
In the stretching and blowing process, preferably, a mold temperature heating device is arranged on the stretching mold and the blowing mold, the mold temperature is kept to be not lower than 150 ℃ and not higher than 170 ℃, the temperature of the blowing head 2 and the head is kept uniform, the extrusion temperature is too high, the resin is easy to decompose and embrittle, and particularly, the longitudinal stretching strength is obviously reduced, and if the temperature is too low, the resin is not plasticized well, the expansion stretching cannot be smoothly carried out, the stretching strength is low, the surface gloss and transparency are poor, and even wood annual patterns and unmelted crystal nuclei (fish eyes) appear.
In addition, the control of the blow-up ratio is one of the control points of the blow-molding production process, and refers to the ratio of the diameter after blowing up to the diameter of the tube ring which is not blown up. The blow-up ratio is the transverse expansion multiple, and actually, the bottle blank is transversely stretched, so that the stretching can generate a certain degree of orientation effect on plastic molecules, and the blow-up ratio is increased, so that the transverse strength of the bottle blank is improved. However, the blow-up ratio cannot be too large, otherwise product instability is easily caused, and wrinkles are easily generated. Therefore, the blow-up ratio should be properly matched with the draft ratio, and in general, the blow-up ratio should be controlled to 2.5 to 3.0.
Similarly, the draw ratio is the ratio of the draw speed of the preform to the extrusion speed of the tube ring. The drawing ratio is the longitudinal drawing multiple, so that the bottle blank has an orientation effect in the drawing direction. The longitudinal strength is improved along with the increase of the traction ratio, and the thickness of the bottle blank is reduced, but if the traction ratio is too large, the thickness of the bottle blank is difficult to control, and the bottle blank may be broken to cause a fracture phenomenon. The traction ratio is preferably controlled to be between 4 and 6.
In order to meet the requirement of the forming process of the flame-retardant plastic oil collection bottle for aviation, the blow molding equipment is improved and comprises the following components: the device comprises a production line, a grinding tool assembly and a blow molding assembly.
The circular assembly line 5 changes the traditional linear conveying into circular circulating conveying, and is provided with a plurality of drying tunnels 6, so that the conveying time of bottle blanks exposed in the air is less than 12 seconds.
The mould assembly comprises a mould frame 4 arranged on the annular assembly line 5 and a mould temperature controller 3 arranged on the mould frame 4.
The blow molding assembly comprises an air pressurization device 7 erected on the circular assembly line 5, a blow head 2 connected with the air pressurization device 7, and a blow head controller 1 arranged on the blow head 2.
As a preferable aspect, the blowing head controller 1 includes: the device comprises a flow sensor for measuring the flow of gas flowing in the blowhead 2, pressure sensors for measuring the upstream and downstream of the blowhead 2, a singlechip connected with the pressure sensors and the flow sensor in signal connection, and an electromagnetic valve for controlling the flow opening.
Wherein, because at whole blow molding stage, gaseous volume of blowing in can play the decisive factor to the shaping good or bad, however in traditional solenoid valve reuse process, under inevitable receiving external noise interference, at any time the going on of blowing process, its flow aperture can receive the interference fluctuation big more, and then influences blow molding. Therefore, the applicant makes a further improvement on the traditional electromagnetic valve, namely, after the flow deviation occurs, the single chip microcomputer makes quick response and adjustment on the actual flow according to the detection data, and the influence of noise fluctuation on the blowing head 2 is reduced.
The opening degree of the electromagnetic valve is calculated according to a specific proportion, and the opening degree accords with the following mathematical model:
wherein the content of the first and second substances,
the flow opening of the electromagnetic valve, namely the instantaneous flow;
is the standard error, i.e., the difference between the flow set point and the measured value measured by the flow sensor;
respectively the pressure values measured by the pressure sensors upstream and downstream of the blowing head,
reaction interval of the blowing head; A. b, C, D is an adjustment coefficient, is related to blowing head equipment, and can be measured by experiment proportion;
the blowing ratio is selected according to the specific process;
time taken for the blow molding stage;
the volume of the un-inflated bottle.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (2)
1. A forming process of an aviation flame-retardant plastic oil collecting bottle comprises the following steps: the bottle comprises a bottle mouth in an inverted splayed shape and a bottle body in a quadrangular shape, wherein the bottle mouth and the bottle body are in an integrally formed structure; wherein the diameter of the mouth part of the oil collecting bottle is 20-45 mm, the diameter of the bottom part of the oil collecting bottle is 50-80 mm, the oil collecting bottle is non-centrosymmetric in shape, and the stretching ratio from the bottle body to the bottle body reaches 1; it is characterized in that the preparation method is characterized in that,
the blow molding equipment that adopts includes:
the circular assembly line is circularly conveyed, and a plurality of drying channels are arranged on the assembly line, so that the conveying time of the bottle blanks exposed in the air is less than 12 seconds;
the mould assembly comprises a mould frame arranged on the annular assembly line and a mould temperature controller arranged on the mould frame;
the blow molding assembly comprises air pressurization equipment erected on the annular production line, a blow head connected with the air pressurization equipment, and a blow head controller arranged on the blow head; the blowing head controller includes: the device comprises a flow sensor for measuring the flow of gas flowing in a blowing head, pressure sensors for measuring the upstream and downstream of the blowing head, a single chip microcomputer in signal connection with the pressure sensors and the flow sensor, and an electromagnetic valve for controlling the flow opening; the opening size of the electromagnetic valve conforms to the following mathematical model:
wherein, the first and the second end of the pipe are connected with each other,
the flow opening of the electromagnetic valve, namely the instantaneous flow;
is the standard error, i.e., the difference between the flow set point and the measured value measured by the flow sensor;
respectively the pressure values measured by the pressure sensors upstream and downstream of the blowing head,
reaction interval of the blowing head; A. b, C, D is the adjustment factor;
the blowing ratio is taken out according to a specific process;
time taken for the blow molding stage;
the volume of the un-inflated bottle;
the adopted forming process comprises the following steps:
s1, injection molding, namely injecting molten plastic into an injection mold through an injection molding device, and forming a transparent bottle tire with a bottom through rapid cooling;
s2, stretching, namely keeping the mold temperature of a stretching mold constant through a heating device, and stretching the bottle blank to a preset proportion through the stretching mold;
s3, blow molding, namely keeping the mold temperature of a blow mold constant through a heating device, and then introducing compressed air into a blowing head to obtain a required transparent hollow oil collecting bottle;
in the blow molding process, a sectional blow molding process is adopted, and the wall thickness is relatively consistent through 2-3 times of blow molding;
in the injection molding process, the demolding height of the bottle blank is increased by 2 to 5cm compared with the target size;
in the stretching and blow molding process, the mold temperature is kept to be not lower than 150 ℃ and not higher than 170 ℃, and the temperature of the blowing head is kept uniform; controlling the blow-up ratio by a blow head controller above the blow head, wherein the blow-up ratio is controlled to be 2.5-3.0, and the traction ratio is controlled to be 4-6;
the plastic melt is polyetherimide material melt or polyetherimide material melt mixed with glass fiber and carbon fiber.
2. An oil collecting bottle prepared based on the molding process of the aviation flame-retardant plastic oil collecting bottle as claimed in claim 1.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101821338A (en) * | 2007-09-10 | 2010-09-01 | 沙伯基础创新塑料知识产权有限公司 | Blow moldable polyimide/polyamide composition, process for blow molding and articles made thereby |
| CN106738796A (en) * | 2016-11-23 | 2017-05-31 | 广州承天包装设计有限公司 | It is applied to the finishing impression processing method on secondary or multiple machine-shaping plastic product |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101821338A (en) * | 2007-09-10 | 2010-09-01 | 沙伯基础创新塑料知识产权有限公司 | Blow moldable polyimide/polyamide composition, process for blow molding and articles made thereby |
| CN106738796A (en) * | 2016-11-23 | 2017-05-31 | 广州承天包装设计有限公司 | It is applied to the finishing impression processing method on secondary or multiple machine-shaping plastic product |
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