CN117507801A - Fuel tank and film blowing process manufacturing method of fuel tank - Google Patents
Fuel tank and film blowing process manufacturing method of fuel tank Download PDFInfo
- Publication number
- CN117507801A CN117507801A CN202311695484.1A CN202311695484A CN117507801A CN 117507801 A CN117507801 A CN 117507801A CN 202311695484 A CN202311695484 A CN 202311695484A CN 117507801 A CN117507801 A CN 117507801A
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- Prior art keywords
- column
- embedded
- disc
- hole
- fuel tank
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- 239000002828 fuel tank Substances 0.000 title claims abstract description 57
- 238000010096 film blowing Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000012815 thermoplastic material Substances 0.000 claims description 63
- 229920001169 thermoplastic Polymers 0.000 claims description 62
- 239000004416 thermosoftening plastic Substances 0.000 claims description 62
- 238000000034 method Methods 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 26
- 230000007246 mechanism Effects 0.000 claims description 19
- 238000007664 blowing Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 241000276425 Xiphophorus maculatus Species 0.000 claims description 2
- 238000000071 blow moulding Methods 0.000 claims description 2
- 238000007373 indentation Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
-
- 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
- B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/03032—Manufacturing of fuel tanks
Abstract
The invention discloses a fuel tank and a film blowing process manufacturing method of the fuel tank, wherein the fuel tank comprises a fuel tank body and an embedded accessory, the embedded accessory comprises a joint main body and a disc-shaped part, the disc-shaped part is provided with an attachment part, and the disc-shaped part is provided with a plurality of through holes which are circumferentially distributed; the embedded accessory comprises a plurality of movable columns, each movable column comprises a cylindrical section and a conical column section positioned at the inner side of the cylindrical section; a column hole is formed in the movable column body, the column hole penetrates through the outer end of the column section, and an internal thread is processed in the column hole; the movable columns are respectively and correspondingly arranged at the through holes, and the cylindrical sections are in sliding fit with the through holes, so that the conical column sections are positioned on the inner side of the rear disc surface of the disc-shaped part and define a first embedded area with the rear disc surface.
Description
Technical Field
The invention relates to the technical field of fuel tank manufacturing, in particular to a fuel tank and a film blowing process manufacturing method of the fuel tank.
Background
Two typical methods of manufacturing fuel tanks for mobile vehicles are: the injection molding process and the film blowing molding process have the advantages that compared with the injection molding process, the film blowing molding process comprises the following steps: on the premise of meeting the same strength, the fuel tank manufactured by adopting the film blowing molding process has thinner wall thickness, thus having lighter weight and using less materials. However, a typical disadvantage of using a blown film process to manufacture a fuel tank is: the combination of the fuel tank and the pre-buried accessories (such as the oil pipe joint component) is difficult, and the positioning is inaccurate, and the reason is that: in the prior art, before film blowing, the embedded accessory is arranged between two thermoplastic parts, so that the embedded accessory needs to penetrate through the thermoplastic parts in the process of expanding the thermoplastic parts by blowing, namely, in the prior art, the embedded accessory is combined with the thermoplastic parts on the inner side, so that the combining procedure of the embedded accessory and the thermoplastic parts is complex, and the embedded accessory is positioned inaccurately.
In order to overcome the defects of difficulty in combining and inaccuracy in positioning the embedded accessory and the thermoplastic component in the film blowing molding process, a novel embedded accessory and a film blowing molding process method for combining the embedded accessory and the fuel tank are provided in a patent (patent number 202310086115.6, a subject name is a fuel tank with the embedded accessory and a process manufacturing method for the fuel tank) filed by the applicant in the prior art, wherein the embedded accessory is combined with the thermoplastic component after expansion deformation on the outer side of the thermoplastic component, specifically, the embedded accessory is configured to comprise a joint main body and a disc-shaped part formed at the tail part of the joint main body, and an attachment part is formed on the rear disc surface of the disc-shaped part, and the attachment part can be formed by conical columns which are circumferentially arranged and fixedly connected (or integrally molded) with the disc-shaped part, or the attachment part is an annular convex rib fixedly connected (or integrally molded) with the disc-shaped part, and the section of the annular convex rib is in a shape, so that a first embedded area for embedding a thermoplastic material is defined between each conical column and the rear disc surface or between the annular convex rib and the rear disc surface; and machining the edge of the disc-shaped part into a concave annular curved surface, so that a second embedded area is defined between the annular curved surface and the inner wall of the die. In this way, in the process of blowing between two thermoplastic components to expand the thermoplastic components and finally extruding the inner wall of the die, thermoplastic materials in corresponding areas of the thermoplastic components respectively enter the first embedding area and the second embedding area, so that after cooling, the embedded accessory and the oil tank body are combined, and the embedded accessory and the film blowing forming process method provided by the patent enable the combining procedure of the embedded accessory and the oil tank body to be simple, and the embedded accessory can be accurately positioned. In addition, the pillars used are used to define the depth of thermoplastic material into the internal bore of the connector body during the film blowing process.
However, the applicant has found the following problems when implementing the above patent:
1. because the thermal expansion performance of the thermoplastic material is different from that of the material used by the embedded accessory, the thermoplastic material entering the first embedded area is easy to separate from the embedded accessory and form a certain gap in the cooling process after film blowing molding and/or the use process of the fuel tank in frequent heat alternating environments, so that the embedded accessory is easy to loosen relative to the fuel tank body, and the combination effect and the sealing effect of the joint main body and the thermoplastic component at the inner hole are further influenced.
2. Because the second embedded region is surrounded by the embedded accessory and the inner wall of the die, after the fuel tank is manufactured and taken out from the die, the outer side of the thermoplastic material entering the second embedded region is in a free state without a limiting structure, and because the thermoplastic material and the thermoplastic material used by the embedded accessory have different thermal expansion properties, the thermoplastic material entering the second embedded region can warp due to release of internal stress in the cooling process after film blowing molding and/or the use process of the fuel tank in frequent heat alternating environment, and therefore, the combination effect of the embedded accessory and the fuel tank body can be influenced, and the appearance quality of the fuel tank can be influenced.
3. In the film blowing process, the axial position of the jacking column in the guide hole is kept unchanged, the end face of the jacking column is at a certain distance from the inner end of the inner hole of the joint main body, and the end face of the jacking column is located at the final deformation position of the plastic material in the area, so that the plastic deformation of the thermoplastic material in the area is not uniform enough.
Disclosure of Invention
Aiming at the technical problems in the prior art, the embodiment of the invention provides a fuel tank and a film blowing process manufacturing method of the fuel tank.
In order to solve the technical problems, the technical scheme adopted by the embodiment of the invention is as follows:
a fuel tank, comprising: the oil tank body is obtained by forcing expansion deformation of two platy thermoplastic parts by blowing; the embedded accessory comprises: a joint main body and a disk-shaped portion formed at a tail portion of the joint main body, the disk-shaped portion being provided with an attachment portion thereon; the embedded accessory is positioned at a preset position outside one of the thermoplastic parts;
the disc-shaped part is provided with a plurality of through holes which are circumferentially distributed;
the embedded accessory comprises a plurality of movable columns, each movable column comprises a cylindrical section and a conical column section positioned at the inner side of the cylindrical section; a column hole is formed in the movable column body, the column hole penetrates through the outer end of the column section, and an internal thread is processed in the column hole; the movable columns are respectively and correspondingly arranged at the through holes, and the cylindrical sections are in sliding fit with the through holes, so that the conical column sections are positioned on the inner side of the rear disk surface of the disk-shaped part and define a first embedding area with the rear disk surface, and thermoplastic materials corresponding to the first embedding area on the outer side of the thermoplastic part are embedded into the first embedding area in the expansion process of the thermoplastic part;
after the thermoplastic material is embedded into the first embedding region and cooled, a screw is screwed into the post hole from the outer side of the disc-shaped portion through the through hole, so that the tapered post section and the rear disc surface clamp the thermoplastic material in the first embedding region.
Preferably, an annular step part is arranged in the through hole, a positioning table is formed at the inner end of the cylindrical section, and the positioning table is attached to the annular step part to limit the distance between the end face of the conical column section and the rear disk face.
Preferably, an annular groove is formed in the outer peripheral surface of the disc-shaped part, a conical surface is arranged on the groove wall of the annular groove close to the inner side, and the annular groove is formed into a second embedded area; a notch which penetrates through the groove wall of the annular groove is formed in the edge of the front disk surface of the disk-shaped part; wherein:
during expansion of the thermoplastic component, thermoplastic material outside the thermoplastic component corresponding to the second embedded region is embedded into the second embedded region and the indentations.
Preferably, a plurality of through-axial openings are formed in the edge of the conical column section, and the plurality of through-axial openings are circumferentially distributed.
Preferably, a slope is formed in a region of the rear disk surface of the disk-shaped portion, which is opposite to the tapered column section of the movable column, and the slope and the outer peripheral surface of the tapered column section enclose the first embedding region.
The invention also discloses a film blowing process manufacturing method of the fuel tank, and the fuel tank comprises the following steps: the oil tank comprises an oil tank body and an embedded accessory, wherein the embedded accessory comprises a joint main body and a disc-shaped part; the disc-shaped part is provided with through holes which are circumferentially distributed, each through hole is provided with a movable column body, each movable column body comprises a column section and a cone column section, a positioning table is formed at the inner end of each column section, each column section is provided with a column hole with internal threads, and the outer circumferential surface of the disc-shaped part is provided with an annular groove; the inner hole of the joint main body is provided with an expanding part;
the blow molding die comprises two dies which are mutually buckled, wherein a plurality of positioning columns which are circumferentially arranged are arranged on the inner wall of one die;
the film blowing process manufacturing method of the fuel tank comprises the following steps:
s10: keeping the two dies in an open die state, loading the embedded accessory into the inner wall of the die with the positioning column, correspondingly inserting the positioning column into the through hole of the embedded accessory and pushing the movable column to enable the positioning table to be abutted against the annular stepped part of the column hole, so that the conical column section of the movable main body extends out of the rear disc surface of the disc-shaped part of the embedded accessory to form a first embedded area with the rear disc surface, and forming a second embedded area by the annular groove of the disc-shaped part;
s20: preheating the pre-buried accessory and the surrounding area thereof;
s30: clamping the two molds and clamping the edges of the two thermoplastic parts between the two molds;
s40, extending a jacking column mechanism into an inner hole of the embedded accessory from the outside of the die through a guide hole, wherein the jacking column mechanism comprises an outer sleeve and a core column which can stretch and retract relative to the outer sleeve and is internally provided with a heating rod, the end face of the outer sleeve is positioned at the expanding part of the inner hole of the joint main body, and the end face of the core column is flush with the inner end opening of the inner hole;
s50: blowing air between the two thermoplastic parts by using a blowing needle to expand the two thermoplastic parts and finally extruding the inner walls of the two molds;
in the expansion process, the thermoplastic material corresponding to the first embedded region of the embedded accessory is hot-melted and enters the first embedded region, and the thermoplastic material corresponding to the second embedded region of the embedded accessory is hot-melted and enters the second embedded region;
in the expansion process, the thermoplastic material of the thermoplastic component corresponding to the inner hole of the joint main body expands and is extruded to the end face of the core column of the top column mechanism, meanwhile, the core column is retracted, the end face of the core column is used as the thermoplastic material to heat so as to guide the thermoplastic material to expand towards the inner hole direction, and the thermoplastic material is expanded to the expansion part through the limit of the end face of the outer sleeve;
s60: cooling the mold to cool the expanded thermoplastic component;
s70: the jack post mechanism is withdrawn from the guide hole, a tubular cutter is extended into the guide hole, the cutter cuts an inner expanding part positioned in the expanding part, and a flanging which is attached to the step surface of the expanding part through expansion is reserved;
s80: opening the two moulds to enable the fuel tank combined by the fuel tank body and the embedded accessory to fall off from the moulds through film blowing;
s90: screwing a compression sleeve and a sealing gasket into the expansion part of the embedded accessory, so that the head part of the compression sleeve is extruded and turned over through the sealing gasket;
s100: and inserting a screw from the outer side of the embedded accessory to the through hole of the disc-shaped part, and screwing the screw to clamp the thermoplastic material in the first embedded area between the rear disc surface of the disc-shaped part and the conical column section of the movable column.
Compared with the prior art, the fuel tank and the film blowing process manufacturing method thereof have the beneficial effects that:
1. through addding the movable cylinder to utilize screw and movable cylinder cooperation, thereby can effectively avoid producing not hard up between pre-buried annex and the oil tank body, and can avoid the screw to directly cooperate with the oil tank body.
2. The annular groove is used as a second embedded area, after the thermoplastic material enters the second embedded area and is cooled, the groove wall of the annular groove can avoid the warpage of the thermoplastic material, and in addition, the notch of the embedded accessory can release the thermal stress generated by the thermoplastic material after cooling or in a thermal alternation environment.
3. The guiding action of the prop mechanism on the thermoplastic material enables the wall thickness of the interface formed after film blowing to be more uniform.
An overview of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all of the features of the technology disclosed.
Drawings
Fig. 1 is a schematic perspective view of a view angle of an embedded accessory on a fuel tank provided by the invention.
Fig. 2 is a schematic perspective view of another view of an embedded accessory on a fuel tank according to the present invention.
Fig. 3 is a schematic perspective view of a movable column on an embedded accessory provided by the invention.
Fig. 4 is a view showing a state after the two molds are clamped.
Fig. 5 is a view showing a state after film blowing molding of two thermoplastic members.
Fig. 6 is an enlarged view of a portion a of fig. 5.
Fig. 7 is an enlarged view of a portion B of fig. 6.
Fig. 8 is a view of the post mechanism directing thermoplastic material into the bore.
Fig. 9 is a view showing a state in which the ejector mechanism guides the thermoplastic material into the expansion portion.
Fig. 10 is a view showing a state in which the inner bulge is cut by the cutter.
Fig. 11 is a view of the compression sleeve and screw assembly orientation.
Fig. 12 is a view showing an assembled state of the compression sleeve and the screw.
Fig. 13 is an enlarged view of a portion C of fig. 12.
Reference numerals:
10-an oil tank body; 11-a first thermoplastic component; 111-thickening; 12-a second thermoplastic component; 20-embedding accessories; 21-a disk; 211-through holes; 2111-annular step; 212-an annular groove; 213-notch; 22-a joint body; 221-an inner hole; 222-a spreading section; 2221-step surface; 23-a movable column; 231-conical column section; 2311-opening; 232-a cylindrical section; 233-a positioning table; 234-column holes; 30-compacting the sleeve; 40-screws; 101-a first mold; 1011—positioning columns; 102-a second mold; 103-a cavity; 104-blowing a needle; 105-a heater; 106-a prop mechanism; 1061-an outer sleeve; 1062-stem; 1063-an electrical heating rod; 107-guiding holes; 1071-mounting holes.
Detailed Description
The present invention will be described in detail below with reference to the drawings and detailed description to enable those skilled in the art to better understand the technical scheme of the present invention.
As shown in fig. 1 to 13, the present invention discloses a fuel tank and a film blowing process manufacturing method of the fuel tank, specifically, the fuel tank includes a fuel tank body 10 and an embedded accessory 20 combined with the fuel tank body 10 from the outside, and the film blowing process manufacturing method is aimed at: on the one hand for expanding the two thermoplastic parts to form the tank body 10; on the other hand, for simultaneously coupling the pre-buried accessory 20 with the tank body 10.
The fuel tank and the film blowing process manufacturing method thereof provided by the invention are improved technologies of patents (patent number 202310086115.6, subject name is the fuel tank with the embedded accessory 20 and the process manufacturing method of the fuel tank) applied by the applicant in the prior art, and the obvious difference between the invention and the prior patents is as follows:
first aspect: the attachment portion of the pre-buried accessory 20 of the fuel tank provided by the invention is different from the attachment portion of the pre-buried accessory 20 in the prior patent, specifically, the attachment portion of the pre-buried accessory 20 is axially movably arranged on the disc-shaped portion 21 of the pre-buried accessory 20 by a plurality of movable columns 23, and is in threaded connection with the movable columns 23 through screws 40, while the attachment portion in the prior patent is fixedly connected with or integrally formed with the disc-shaped portion 21 of the pre-buried accessory 20.
Second aspect: the outer circumferential surface of the disc-shaped portion 21 of the pre-buried accessory 20 in the present invention is provided with an annular groove 212, and an annular curved surface is processed in the prior patent.
Third aspect: in the present invention, during the film blowing process, the post mechanism 106 is not only used to limit the final expansion position of the thermoplastic material corresponding to the internal bore 221 of the connector body 22 of the pre-buried attachment 20, but more importantly, to direct the proper, sequential expansion of the thermoplastic material in that region.
In order to facilitate understanding of the technical solution of the present invention, the present invention describes not only aspects different from those of the prior patent but also aspects identical to those of the prior patent.
The film blowing process manufacturing method of the fuel tank provided by the invention comprises the following steps:
s10: the two molds are maintained in an open state, and the pre-buried accessory 20 is installed at the inner wall of one of the molds.
Specifically, as shown in fig. 1 to 3, and in conjunction with fig. 6 and 7, the pre-buried accessory 20 may be used as a fuel pipe joint to be combined with the fuel tank body 10, and the pre-buried accessory 20 includes an integrally formed joint body 22 and a disc-shaped portion 21 formed at the tail of the joint body 22.
The connector body 22 is machined with an inner bore 221, which inner bore 221 is intended to be attached to the expanded thermoplastic material during the film blowing process, so that the inner bore 221 of the connector body 22 forms an interface with the tank body 10, and a radially enlarged relief 222 is machined at the inner bore 221.
In the present invention, a plurality of through holes 211 are formed in the disk portion 21 so as to be circumferentially arranged along the axial center of the inner hole 221 of the joint main body 22, and an annular stepped portion 2111 is formed in each through hole 211 so as to face the front disk surface of the disk portion 21. The disk portion 21 is provided with an attachment portion including a plurality of movable cylinders 23 arranged circumferentially, the plurality of movable cylinders 23 being provided at through holes 211 of the disk portion 21, respectively.
The movable column 23 comprises a cylindrical section 232 and a conical section integrally formed at the inner side of the cylindrical section 232, a positioning table 233 is formed at the outer end of the cylindrical section 232, an axially extending column hole 234 is formed in the movable column 23, the column hole 234 penetrates through to the outer end face of the cylindrical section 232, and internal threads are machined on the wall of the column hole 234. The cylindrical section 232 of the movable column 23 penetrates the disc-shaped portion 21 and is slidably engaged with the disc-shaped portion 21, so that the tapered column section 231 protrudes from the rear disc surface of the disc-shaped portion 21, the movable column 23 is axially movable relative to the disc-shaped portion 21, and the distance between the end surface of the tapered column section 231 and the rear disc surface is defined by abutting the positioning table 233 against the annular stepped portion 2111 of the through hole 211.
In the present invention: an annular groove 212 is formed in the outer peripheral surface of the disc-shaped portion 21, and a conical surface is arranged on the groove wall of the annular groove 212 close to the inner side; a notch 213 penetrating to the groove wall of the annular groove 212 is formed from the edge of the front disk surface of the disk-shaped portion 21.
As shown in fig. 4 and in combination with fig. 6 and 7, the mold includes a first mold 101 and a second mold 102, and concave areas are formed on the inner sides of the first mold 101 and the second mold, so that a cavity 103 is formed after the first mold 101 and the second mold 102 are buckled. A structure adapted to the pre-buried accessory 20 is configured on the wall of the concave region of the first mold 101 (i.e., on the inner wall of the first mold 101) so that the pre-buried accessory 20 can be assembled on the inner wall of the first mold 101, specifically, a mounting hole 1071 and a guide hole 107 penetrating through the mounting hole 1071 are opened in the center of the first mold 101, and a plurality of positioning posts 1011 arranged circumferentially protruding toward the cavity 103 are provided on the periphery of the mounting hole 1071. In the process of installing the embedded accessory 20, the joint main body 22 of the embedded accessory 20 is inserted into the central hole from the inner side of the first mold 101, and meanwhile, the positioning columns 1011 are respectively and correspondingly inserted into the through holes 211 of the disc-shaped portion 21 of the embedded accessory 20, so that the positioning columns 1011 push against the movable column 23, and further, the positioning table 233 of the movable column 23 abuts against the annular stepped portion 2111 of the through hole 211. At this time, the tapered section 231 of the movable cylinder 23 is located in the cavity 103 and defines a first insertion area with the rear disk surface of the disk portion 21, and the volume of the first insertion area is preferably increased by machining a slope on the rear disk surface of the area corresponding to the tapered section 231.
After the preliminary set 20 is mounted on the inner wall of the first mold 101, the annular groove 212 of the outer circumferential surface of the disk-shaped portion 21 of the preliminary set 20 is exposed radially outwardly in the cavity 103, so that the annular groove 212 is formed as a second insert region.
S20: preheating the pre-buried accessory 20 and its surrounding area. ,
specifically, a heater 105 is installed around the pre-buried accessory 20 of the first mold 101, the heater 105 being configured to heat the pre-buried accessory 20 and its surrounding area for causing a degree of thermal melting of the thermoplastic material upon contact with the pre-buried accessory 20, and in particular with the pan 21 of the accessory part.
S30: as shown in fig. 4, the two molds are clamped, and the edges of the two thermoplastic parts are clamped between the two molds.
Specifically, the thermoplastic part is processed into a plate-like structure, which is a blank for manufacturing the tank body 10, and the two thermoplastic parts are a first thermoplastic part 11 and a second thermoplastic part 12, the first thermoplastic part 11 being located at one side of the first mold 101, so that the first thermoplastic part 11 is used to bond with the pre-buried accessory 20 after expansion deformation. In order to make the thickness of the area where the expanded first thermoplastic part 11 is combined with the embedded accessory 20 greater than other positions to increase the strength of the area, a thickened part 111 with a significantly increased thickness is processed on the inner side of the first thermoplastic part 11 before film blowing, so that the first thermoplastic part 11 can provide enough thermoplastic material for the first embedded area when the first thermoplastic part 11 expands to be combined with the embedded accessory 20.
S40, as shown in fig. 5 and 6, the jack post mechanism 106 extends into the inner hole 221 of the embedded accessory 20 from outside the first mold 101 through the guide hole 107. Specifically, the jack mechanism 106 includes a jacket 1061 and a stem 1062 that can be extended and retracted from an end surface of the jacket 1061, wherein an electric heating rod 1063 is installed in the stem 1062, and the electric heating rod 1063 is close to the end surface of the stem 1062; the end surface of the outer jacket 1061 is positioned at the expansion 222 of the inner bore 221 of the connector body 22 and held at the expansion 222 by the driver driving the outer jacket 1061, and the stem 1062 is moved out of the end surface of the outer jacket 1061 to the inner port of the inner bore 221, i.e., such that the end surface of the stem 1062 is flush with the inner port of the inner bore 221.
S50: the blow needle 104 is used to blow air between the two thermoplastic parts so that the two thermoplastic parts expand and eventually squeeze the inner walls of the two molds. Specifically, after the first mold 101 and the second mold 102 are closed, an air-filling hole is reserved between edges of the first thermoplastic member 11 and the second thermoplastic member 12, and the blowing needle 104 passes through the air-filling hole and then extends between the first thermoplastic member 11 and the second thermoplastic member 12. The blowing needle 104 blows air between the two thermoplastic parts by means of the high pressure air provided by the high pressure air pump, and the two thermoplastic parts expand under the action of the high pressure air, so that the thermoplastic parts are finally extruded onto the inner wall of the mould and the embedded accessory 20.
As shown in fig. 6 and 7, in the process of expanding and pressing the first thermoplastic member 11 to the inner wall of the mold and the pre-buried attachment 20, the pre-buried attachment 20 heated by the heater 105 heats the thermoplastic material of the first thermoplastic member 11 in contact therewith to a nearly molten or semi-molten state, and the thermoplastic material corresponding to the first embedded region enters the first embedded region and the thermoplastic material corresponding to the second embedded region enters the second embedded region and the notch 213 by the pressing caused by the air pressure.
During expansion of the first thermoplastic part 11, as shown in fig. 7, the thermoplastic material corresponding to the bore 221 of the joint body 22 is extruded to the end face of the stem 1062 of the stem mechanism 106, so that the end face of the stem 1062 receives the thermoplastic material, after the end face of the stem 1062 is received in the thermoplastic material, as shown in fig. 8, the stem 1062 is driven to retract slowly by the driving mechanism, the thermoplastic material in this area expands toward the bore 221 while keeping contact with the end face of the stem 1062 under the action of air pressure, at the same time, the stem 1062 heats the thermoplastic material in contact with the end face by means of the electric heating rod 1063, heats the thermoplastic material to a semi-molten state, so that the thermoplastic material has a more compliant property, the retraction of the stem 1062 under the action of air pressure and heating guides the thermoplastic material to deform toward the bore 221, and finally, as shown in fig. 9, the thermoplastic material is guided to the expansion 222 of the bore 221 after the mandrel retracts into the jacket 1061 and the end face of the stem 1062 is flush with the end face of the jacket 1061. In the process of being guided to the expansion portion 222, the thermoplastic material expands radially at the stepped surface 2221 formed by the expansion portion 222 to form a flange attached to the stepped surface 2221.
The wall thickness of the thermoplastic material at the interface formed by the guidance of the stem 1062 is relatively uniform both axially and circumferentially.
S60: the mold is cooled to cool the expanded thermoplastic component.
S70: as shown in fig. 10, the entire jack mechanism 106 is withdrawn from the guide hole 107, a tubular cutter is inserted into the guide hole 107, and the cutter cuts the inner bulge portion located in the expansion portion 222, and a flange which is attached to the stepped surface 2221 of the expansion portion 222 by expansion is retained. The flange allows this area to be joined to the embedment attachment 20.
And S80, opening the two molds so that the oil tank body 10 and the embedded accessory 20 obtained by film blowing are separated from the molds.
S90: as shown in fig. 11 and 12, the compression sleeve 30 and the gasket are screwed into the expansion portion 222 of the pre-buried accessory 20, so that the head of the compression sleeve 30 is pressed and turned by the gasket;
s100: the screw 40 is inserted from the outside of the pre-buried accessory 20 toward the through hole 211 of the disk 21. As shown in fig. 12 and 13, specifically, the screw 40 is screwed so that the nut of the screw 40 abuts against the rear disc surface of the disc portion 21, and the head of the screw 40 is screwed with the internal thread of the movable column 23, so that the thermoplastic material in the first embedding region is clamped between the rear disc surface of the disc portion 21 and the tapered column section 231 of the movable column 23, thereby effectively preventing looseness between the pre-buried accessory 20 and the oil tank body 10. Preferably, the edge of the tapered column segment 231 is provided with a plurality of through-holes 2311, and the plurality of through-holes 2311 are circumferentially arranged, and the thermoplastic material is also filled in the through-holes 2311 during the process of entering the first embedding region, so that the movable column 23 is restricted from rotating after cooling, and thus, the movable column 23 can be effectively prevented from rotating when the screw 40 is screwed.
The fuel tank and the film blowing process manufacturing method thereof provided by the invention have the advantages that:
1. having the advantage of the applicant's prior application.
2. Through addding movable cylinder 23 to utilize screw 40 and the cooperation of movable cylinder 23, thereby can effectively avoid producing not hard up between pre-buried annex 20 and the oil tank body 10, and can avoid screw 40 direct and the cooperation of oil tank body 10.
3. The annular groove 212 is used as a second embedded area, after the thermoplastic material enters the second embedded area and is cooled, the groove wall of the annular groove 212 can avoid the warpage of the thermoplastic material, and in addition, the notch 213 of the embedded accessory 20 can release the thermal stress generated by the thermoplastic material after cooling or in a thermal alternating environment.
4. The guiding action of the post mechanism 106 on the thermoplastic material results in a more uniform wall thickness of the interface formed after film blowing.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and are intended to be within the spirit and scope of the invention.
Claims (6)
1. A fuel tank, comprising: the oil tank body is obtained by forcing expansion deformation of two platy thermoplastic parts by blowing; the embedded accessory comprises: a joint main body and a disk-shaped portion formed at a tail portion of the joint main body, the disk-shaped portion being provided with an attachment portion thereon; the embedded accessory is positioned at a preset position outside one of the thermoplastic parts;
it is characterized in that the method comprises the steps of,
the disc-shaped part is provided with a plurality of through holes which are circumferentially distributed;
the embedded accessory comprises a plurality of movable columns, each movable column comprises a cylindrical section and a conical column section positioned at the inner side of the cylindrical section; a column hole is formed in the movable column body, the column hole penetrates through the outer end of the column section, and an internal thread is processed in the column hole; the movable columns are respectively and correspondingly arranged at the through holes, and the cylindrical sections are in sliding fit with the through holes, so that the conical column sections are positioned on the inner side of the rear disk surface of the disk-shaped part and define a first embedding area with the rear disk surface, and thermoplastic materials corresponding to the first embedding area on the outer side of the thermoplastic part are embedded into the first embedding area in the expansion process of the thermoplastic part;
after the thermoplastic material is embedded into the first embedding region and cooled, a screw is screwed into the post hole from the outer side of the disc-shaped portion through the through hole, so that the tapered post section and the rear disc surface clamp the thermoplastic material in the first embedding region.
2. The fuel tank of claim 1, wherein an annular step is provided in the through hole, and a locating land is formed at an inner end of the cylindrical section, the locating land being attached to the annular step to define a distance of an end face of the tapered column section relative to the rear disc face.
3. The fuel tank according to claim 1, wherein an annular groove is formed in an outer peripheral surface of the disc-shaped portion, a tapered surface is provided on a groove wall of the annular groove close to an inner side, and the annular groove is formed into a second insertion region; a notch which penetrates through the groove wall of the annular groove is formed in the edge of the front disk surface of the disk-shaped part; wherein:
during expansion of the thermoplastic component, thermoplastic material outside the thermoplastic component corresponding to the second embedded region is embedded into the second embedded region and the indentations.
4. The fuel tank of claim 1, wherein the edge of the tapered section is provided with a plurality of axially extending slots, the plurality of slots being circumferentially arranged.
5. The fuel tank according to claim 1, wherein a region of the rear disc face of the disc-shaped portion opposite to the tapered column section of the movable column is formed with a slope, the slope and an outer peripheral face of the tapered column section enclosing the first insertion region.
6. A method of manufacturing a blown film process for a fuel tank, the fuel tank comprising: the oil tank comprises an oil tank body and an embedded accessory, wherein the embedded accessory comprises a joint main body and a disc-shaped part; the disc-shaped part is provided with through holes which are circumferentially distributed, each through hole is provided with a movable column body, each movable column body comprises a column section and a cone column section, a positioning table is formed at the inner end of each column section, each column section is provided with a column hole with internal threads, and the outer circumferential surface of the disc-shaped part is provided with an annular groove; the inner hole of the joint main body is provided with an expanding part;
the blow molding die comprises two dies which are mutually buckled, wherein a plurality of positioning columns which are circumferentially arranged are arranged on the inner wall of one die;
the film blowing process manufacturing method of the fuel tank comprises the following steps:
s10: keeping the two dies in an open die state, loading the embedded accessory into the inner wall of the die with the positioning column, correspondingly inserting the positioning column into the through hole of the embedded accessory and pushing the movable column to enable the positioning table to be abutted against the annular stepped part of the column hole, so that the conical column section of the movable main body extends out of the rear disc surface of the disc-shaped part of the embedded accessory to form a first embedded area with the rear disc surface, and forming a second embedded area by the annular groove of the disc-shaped part;
s20: preheating the pre-buried accessory and the surrounding area thereof;
s30: clamping the two molds and clamping the edges of the two thermoplastic parts between the two molds;
s40, extending a jacking column mechanism into an inner hole of the embedded accessory from the outside of the die through a guide hole, wherein the jacking column mechanism comprises an outer sleeve and a core column which can stretch and retract relative to the outer sleeve and is internally provided with a heating rod, the end face of the outer sleeve is positioned at the expanding part of the inner hole of the joint main body, and the end face of the core column is flush with the inner end opening of the inner hole;
s50: blowing air between the two thermoplastic parts by using a blowing needle to expand the two thermoplastic parts and finally extruding the inner walls of the two molds;
in the expansion process, the thermoplastic material corresponding to the first embedded region of the embedded accessory is hot-melted and enters the first embedded region, and the thermoplastic material corresponding to the second embedded region of the embedded accessory is hot-melted and enters the second embedded region;
in the expansion process, the thermoplastic material of the thermoplastic component corresponding to the inner hole of the joint main body expands and is extruded to the end face of the core column of the top column mechanism, meanwhile, the core column is retracted, the end face of the core column is used as the thermoplastic material to heat so as to guide the thermoplastic material to expand towards the inner hole direction, and the thermoplastic material is expanded to the expansion part through the limit of the end face of the outer sleeve;
s60: cooling the mold to cool the expanded thermoplastic component;
s70: the jack post mechanism is withdrawn from the guide hole, a tubular cutter is extended into the guide hole, the cutter cuts an inner expanding part positioned in the expanding part, and a flanging which is attached to the step surface of the expanding part through expansion is reserved;
s80: opening the two moulds to enable the fuel tank combined by the fuel tank body and the embedded accessory to fall off from the moulds through film blowing;
s90: screwing a compression sleeve and a sealing gasket into the expansion part of the embedded accessory, so that the head part of the compression sleeve is extruded and turned over through the sealing gasket;
s100: and inserting a screw from the outer side of the embedded accessory to the through hole of the disc-shaped part, and screwing the screw to clamp the thermoplastic material in the first embedded area between the rear disc surface of the disc-shaped part and the conical column section of the movable column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311695484.1A CN117507801A (en) | 2023-12-12 | 2023-12-12 | Fuel tank and film blowing process manufacturing method of fuel tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311695484.1A CN117507801A (en) | 2023-12-12 | 2023-12-12 | Fuel tank and film blowing process manufacturing method of fuel tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117507801A true CN117507801A (en) | 2024-02-06 |
Family
ID=89743866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311695484.1A Pending CN117507801A (en) | 2023-12-12 | 2023-12-12 | Fuel tank and film blowing process manufacturing method of fuel tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117507801A (en) |
-
2023
- 2023-12-12 CN CN202311695484.1A patent/CN117507801A/en active Pending
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