CN113386323A - Blow molding process for oil tank - Google Patents
Blow molding process for oil tank Download PDFInfo
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- CN113386323A CN113386323A CN202110653063.7A CN202110653063A CN113386323A CN 113386323 A CN113386323 A CN 113386323A CN 202110653063 A CN202110653063 A CN 202110653063A CN 113386323 A CN113386323 A CN 113386323A
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- oil tank
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- 238000000071 blow moulding Methods 0.000 title claims abstract description 39
- 238000007664 blowing Methods 0.000 claims abstract description 37
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 239000002828 fuel tank Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 12
- 210000001161 mammalian embryo Anatomy 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
- B29C49/04—Extrusion blow-moulding
-
- 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
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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
- B29C49/4268—Auxiliary operations during the blow-moulding operation
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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
- B29C49/20—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
- B29C2049/2008—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 inside the article
-
- 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
- B29C49/04—Extrusion blow-moulding
- B29C49/04104—Extrusion blow-moulding extruding the material discontinuously
Abstract
The invention relates to the technical field of oil tank production, and provides an oil tank blow molding process, which comprises the following steps: extruding a molten cylindrical blank by feeding equipment, positioning the cylindrical blank between two side dies, expanding the lower end of the blank by using an expansion device, lifting an intermediate die by using a lifting device, enabling the intermediate die to enter from an expanded lower end opening of the cylindrical blank, adsorbing the cylindrical blank by vacuum by using the two side dies, preforming the cylindrical blank, closing the two side dies at one time, cutting the cylindrical blank into two pieces by relying on cutting lines of the two side dies and the intermediate die, descending the intermediate die, continuously adsorbing the two sheet blanks by using the vacuum by using the two side dies, placing an embedded part on the inner wall of the sheet blank by using a robot, closing the two side dies at the second time, and performing a side-blowing needle blowing process by relying on the closing lines of the two side dies to complete the blow molding of the embedded part oil tank. Through above-mentioned technical scheme, the easy problem that takes place the seepage of oil tank of blow molding production among the correlation technique has been solved.
Description
Technical Field
The invention relates to the technical field of oil tank production, in particular to an oil tank blow molding process.
Background
In the production of fuel tanks for motor vehicles, blow molding is an essential procedure, using blow molding equipment to blow mold the fuel tanks.
In the blow molding process of the fuel tank, the existing molding method is to obtain a fuel tank body through high-pressure blow molding based on an extruded molten cylindrical blank, and in the blow molding process of the fuel tank, an internal part is required to be installed inside the fuel tank, and some breakwaters are arranged inside the fuel tank, so that the noise of the fuel tank is reduced, the strength of the fuel tank can be enhanced, and the deformation is prevented.
However, due to the limitation of the size of the lower end opening of the cylindrical blank, only some small breakwaters can be built in the prior art, some valve body elements cannot be mounted on the oil tank in an early built-in mode due to overlarge volume, the valve body elements can only pass through the holes cut in the surface of the oil tank, and then the valve body parts are welded at the positions of the holes by a welding machine, so that the mounting process has some hidden dangers, the machining mode of the holes cuts the integrity of the oil tank, gaps are easy to generate at the welding positions, and the oil tank is easy to leak. How to realize that more parts can be installed in a built-in mode is a difficulty faced in the field.
Disclosure of Invention
The invention provides a blow molding process of an oil tank, which solves the problem that the oil tank produced by blow molding in the related technology is easy to leak.
The technical scheme of the invention is as follows:
a blow molding process of an oil tank comprises the following steps:
step A, extruding a molten cylindrical blank by feeding equipment, wherein the cylindrical blank is positioned between two side molds, expanding the lower end of the blank by using an expansion device,
step B, lifting the intermediate die by a lifting device, enabling the intermediate die to enter from the expanded lower end opening of the cylindrical parison,
step C, adopting vacuum to adsorb the cylindrical blank by the molds at the two sides, preforming the cylindrical blank,
step D, closing the two side molds at one time, cutting the cylindrical blank into two pieces by the cutting lines of the two side molds and the middle mold,
step F, descending the middle die, continuously adopting vacuum to adsorb the two sheet blanks by the dies on the two sides, using a robot to place the built-in part on the inner wall of the sheet blank,
g, carrying out secondary die assembly on the dies on the two sides, carrying out a side needle blowing and molding process by depending on the die assembly lines of the dies on the two sides,
and H, completing blow molding of the oil tank with the built-in part.
As a further technical solution, the side needle blowing process in step G includes:
g1, one of the two side molds is provided with two blowing pin inserting holes, two side blowing pins are respectively inserted into the two blowing pin inserting holes, high-pressure gas is introduced into the two side blowing pins,
and G2, after the high-pressure gas is introduced into the two side blowing needles for 20-40 seconds, introducing the high-pressure gas into one side blowing needle, and exhausting the gas from the other side blowing needle to form a circular blowing loop.
As a further technical proposal, the pressure of the high-pressure gas in the step G1 is 0.8MPa, and the pressure of the high-pressure gas in the step G2 is 0.6 MPa.
As a further technical scheme, the two side dies are provided with two die closing opening lines, cutting lines are positioned on the outer side, and die closing lines are positioned on the inner side.
And C, in a step C, a plurality of air outlets are formed in the middle die, compressed air is blown out of the air outlets to the interior of the cylindrical blank, and the cylindrical blank is preformed by adopting vacuum adsorption in cooperation with the dies on the two sides.
As a further technical solution, between step F and step D, the method further comprises:
and E, after the cutting is finished and before the middle die descends, taking out the redundant outer ring materials generated by cutting by using a material blank manipulator.
As a further technical scheme, the step H also comprises the steps of carrying out cooling forming and burr trimming on the oil tank subjected to blow molding.
The working principle and the beneficial effects of the invention are as follows:
in order to solve the problem that the oil tank is easy to leak, the difficulty of primary solution is to overcome the size of the opening of the cylindrical blank and embed more elements. The research and development thinking at the beginning is that two-piece type embryo is adopted for respectively blanking, the blow molding form of the existing cylindrical type embryo is broken, the size of an opening of the cylindrical type embryo is not limited, more operation spaces exist in the two-piece type embryo, the parts of valve bodies needing to be welded originally can be placed in the oil tank in advance and are blow molded together with the oil tank, and the problem that gaps are easy to appear in the later-stage hole-drawing welding process is solved.
However, the idea has a great disadvantage that the two-piece discharging mode can be realized only by changing the blow molding equipment after the original production line is changed too much, and the investment is huge, so that many manufacturers cannot implement the full implementation even if considering the solution way of the large-volume built-in part due to the capital investment problem. Therefore, how to use the existing equipment without great modification can be realized in the blow molding production process of the oil tank, the size of the opening of the cylindrical blank is overcome, and the built-in part with larger volume is placed in advance, which is a technical difficulty faced by the technical personnel in the field.
Further, the present application contemplates a way to minimize the modifications to the existing production line and also to enable the incorporation of larger volume components in advance. The feeding device still provides a cylindrical blank, the cylindrical blank is torn into two pieces through cutting lines of the middle die and the dies on the two sides, and then the operation of adding the built-in part is carried out, so that when the built-in part is added, the built-in part does not need to be added by extending into the cylindrical blank from the opening at the lower end of the cylindrical blank inwards, the two pieces of blank are torn, and a large operation space exists when the built-in part is added by a manipulator. The idea for solving the technical problem is to use the smallest investment and solve the problem in the actual production.
Specifically, in step C, when the cylindrical parison is preformed, since the preforming time is short, generally only 5 to 10 seconds exist, the cylindrical parison is very hot and unstable after forming, the preformed parison and the inner walls of the molds on both sides are completely attached to each other by the vacuum adsorption pumps which are located on the molds on both sides, and then the accuracy of the position of the insert can be ensured by placing the insert. In this step, according to the conventional thinking in this field, mostly adopt compressed air to make the material embryo laminate both sides mould, but when adopting the compressed air experiment, the accuracy of built-in piece can not guarantee, through continuous attempt, adopts the form of vacuum adsorption, is the form that can guarantee the mounted position of built-in piece most.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of a feeding apparatus of the present invention extruding a cylindrical parison in a molten state;
FIG. 2 is a schematic view of the lifting apparatus of the present invention lifting an intermediate mold;
FIG. 3 is a schematic view of the mold assembly of the present invention;
FIG. 4 is a schematic view of the placement of the insert of the present invention;
FIG. 5 is a schematic diagram of the secondary closing of the molds on both sides of the present invention;
in the figure: 1. the method comprises the following steps of (1) cylindrical blank, (2) two side molds, (3) a lifting device, (4) a middle mold, (5) sheet blank, (6) and a built-in part.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
Example 1
As shown in fig. 1 to 5, the present embodiment provides a blow molding process for a fuel tank, including the following steps:
step A, referring to FIG. 1, a feeding device extrudes a molten cylindrical parison 1, the cylindrical parison 1 is positioned between two side molds 2, the lower end of the parison is expanded using an expansion device,
step B, referring to FIG. 2, the lifting device 3 lifts the middle mold 4, the middle mold 4 enters from the lower end opening of the expanded cylindrical parison 1,
step C, the molds 2 at the two sides adopt vacuum to adsorb the cylindrical blank 1, the cylindrical blank 1 is preformed,
step D, referring to FIG. 3, the two side molds 2 are closed once, the two side molds 2 are provided with two closing opening lines, the cutting line is positioned at the outer side, the closing line is positioned at the inner side, the cylindrical blank 1 is cut into two pieces by the cutting lines of the two side molds 2 and the middle mold 4,
step E, after the cutting is finished and before the middle die 4 descends, the redundant outer ring materials generated by the cutting are taken out by using a material blank manipulator,
step F, referring to fig. 4, the middle die 4 descends, the two dies 2 on the two sides continuously adopt vacuum to adsorb the two sheet blanks 5, the built-in part 6 is placed on the inner wall of the sheet blank 5 by using a robot,
step G1, referring to FIG. 5, the two side molds 2 are closed twice, the molds are closed by the closing lines of the two side molds 2, after the molds are closed, one of the two side molds 2 is provided with two blowing pin insertion holes, the two side blowing pins are respectively inserted into the two blowing pin insertion holes, the two side blowing pins are both introduced with high pressure gas, the pressure of the high pressure gas in the step is 0.8MPa,
g2, after the high-pressure gas is introduced into the two side blowing needles for 20 seconds, introducing the high-pressure gas into one side blowing needle, exhausting the gas from the other side blowing needle to form a circular blowing loop, wherein the pressure of the high-pressure gas in the step is 0.6Mpa,
and H, completing blow molding of the oil tank with the built-in part 6, and performing cooling molding and burr trimming on the oil tank subjected to blow molding.
Example 2
As shown in fig. 1 to 5, the present embodiment provides a blow molding process for a fuel tank, including the following steps:
step A, referring to FIG. 1, a feeding device extrudes a molten cylindrical parison 1, the cylindrical parison 1 is positioned between two side molds 2, the lower end of the parison is expanded using an expansion device,
step B, referring to FIG. 2, the lifting device 3 lifts the middle mold 4, the middle mold 4 enters from the lower end opening of the expanded cylindrical parison 1,
step C, the molds 2 at the two sides adopt vacuum to adsorb the cylindrical blank 1, the cylindrical blank 1 is preformed,
step D, referring to FIG. 3, the two side molds 2 are closed once, the two side molds 2 are provided with two closing opening lines, the cutting line is positioned at the outer side, the closing line is positioned at the inner side, the cylindrical blank 1 is cut into two pieces by the cutting lines of the two side molds 2 and the middle mold 4,
step E, after the cutting is finished and before the middle die 4 descends, the redundant outer ring materials generated by the cutting are taken out by using a material blank manipulator,
step F, referring to fig. 4, the middle die 4 descends, the two dies 2 on the two sides continuously adopt vacuum to adsorb the two sheet blanks 5, the built-in part 6 is placed on the inner wall of the sheet blank 5 by using a robot,
step G1, referring to FIG. 5, the two side molds 2 are closed twice, the molds are closed by the closing lines of the two side molds 2, after the molds are closed, one of the two side molds 2 is provided with two blowing pin insertion holes, the two side blowing pins are respectively inserted into the two blowing pin insertion holes, the two side blowing pins are both introduced with high pressure gas, the pressure of the high pressure gas in the step is 0.8MPa,
g2, after the high-pressure gas is introduced into the two side blowing needles for 40 seconds, introducing the high-pressure gas into one side blowing needle, exhausting the gas from the other side blowing needle to form a circular blowing loop, wherein the pressure of the high-pressure gas in the step is 0.6Mpa,
and H, completing blow molding of the oil tank with the built-in part 6, and performing cooling molding and burr trimming on the oil tank subjected to blow molding.
In embodiments 1 and 2, in order to solve the problem that the fuel tank is likely to leak, the first difficulty to be solved is to overcome the size of the opening of the cylindrical blank 1 and embed more components. The research and development thinking at the beginning is that two pieces of blanks are adopted for respectively discharging, the blow molding form of the existing cylindrical blank 1 is broken, the size of an opening of the cylindrical blank 1 is not limited, more operation spaces exist in the two pieces, the parts of valve bodies needing to be welded originally can be placed in an oil tank in advance and are blow molded together with the oil tank, and the problem that gaps are easy to appear in the later-stage hole cutting welding process is solved.
However, the idea has a great disadvantage that the two-piece discharging mode can be realized only by changing the blow molding equipment with too large change of the original production line, and the investment is huge, so that many manufacturers cannot implement the full implementation even if considering the solution way of the large-volume built-in part 6 due to the capital investment problem. Therefore, how to use the existing equipment without great modification can be realized in the oil tank blow molding production process, the size of the opening of the cylindrical blank 1 is overcome, and the built-in part 6 with larger volume is placed in advance, which is a technical difficulty faced by the technical personnel in the field.
Further, the present application contemplates a way to minimize the modifications to the existing production line and also to enable the incorporation of larger volume components in advance. The specific implementation means is that on the basis of original equipment, the middle die 4 is added, the two side dies 2 are designed into an inner die closing opening line and an outer die closing opening line, only two improvements are made, the feeding equipment still provides the cylindrical blank 1, the cylindrical blank 1 is torn into two pieces through the cutting lines of the middle die 4 and the two side dies 2, then the operation of adding the built-in part 6 is carried out, when the built-in part 6 is added, the built-in part 6 does not need to be inwards extended into the cylindrical blank 1 from the opening at the lower end of the cylindrical blank 1 to be added, the two sheet blanks 5 are torn, and a large operation space is provided when the built-in part 6 is added by a manipulator. The idea for solving the technical problem is to use the smallest investment and solve the problem in the actual production.
Specifically, in step C, when the cylindrical parison 1 is preformed, since the preforming time is short, generally only 5 to 10 seconds, the cylindrical parison 1 is hot and unstable after forming, the vacuum suction pumps located on the molds 2 on both sides are required to completely adhere the preformed parison to the inner walls of the molds 2 on both sides, and then the insert 6 is placed, so that the accuracy of the position of the insert 6 can be ensured. In this step, according to the conventional thinking in this field, mostly adopt compressed air to make the material embryo laminate both sides mould 2, but when adopting the compressed air experiment, the accuracy of built-in 6 can not guarantee, through continuous attempt, adopts the form of vacuum adsorption, is the form that can guarantee the mounted position of built-in 6 most.
Example 3
As shown in fig. 1 to 5, in addition to embodiment 1 or embodiment 2, a process is added in step C,
and a plurality of air outlets are formed in the middle die 4, compressed air is blown out of the air outlets to the inside of the cylindrical blank 1, and the cylindrical blank 1 is preformed by adopting vacuum adsorption in cooperation with the dies 2 on the two sides.
In the step C, when the cylindrical parison 1 is preformed, since the preforming time is short, the speed of only adsorbing the cylindrical parison 1 by vacuum is not enough, and the intermediate mold 4 can be provided with a plurality of air outlets to communicate with compressed air to assist the preforming of the cylindrical parison 1, so that the intermediate mold 4 can be conveniently lowered and retracted, and the cylindrical parison 1 and the intermediate mold 4 cannot be adhered.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The blow molding process of the oil tank is characterized by comprising the following steps of:
step A, extruding a molten cylindrical blank (1) by feeding equipment, wherein the cylindrical blank (1) is positioned between two side molds (2), expanding the lower end of the blank by using an expanding device,
step B, the lifting device (3) lifts the middle die (4), the middle die (4) enters from the lower end opening of the expanded cylindrical parison (1),
step C, the molds (2) at the two sides adopt vacuum adsorption of the cylindrical blank (1), the cylindrical blank (1) is preformed,
step D, the two side molds (2) are closed at one time, the cylindrical blank (1) is cut into two pieces by the cutting lines of the two side molds (2) and the middle mold (4),
f, descending the middle die (4), continuously vacuum-absorbing the two sheet blanks (5) by the dies (2) at the two sides, placing the built-in part (6) on the inner wall of the sheet blank (5) by using a robot,
g, carrying out secondary die assembly on the dies (2) on the two sides, carrying out a side blow needle blow molding process by depending on the die assembly lines of the dies (2) on the two sides,
and H, completing the blow molding of the oil tank with the built-in part (6).
2. The blow molding process for fuel tanks according to claim 1, wherein the side-blowing needle blow molding process in step G comprises:
g1, one of the two side moulds (2) is provided with two blowing pin inserting holes, two side blowing pins are respectively inserted into the two blowing pin inserting holes, high-pressure gas is introduced into the two side blowing pins,
and G2, after the high-pressure gas is introduced into the two side blowing needles for 20-40 seconds, introducing the high-pressure gas into one side blowing needle, and exhausting the gas from the other side blowing needle to form a circular blowing loop.
3. The blow molding process for a fuel tank according to claim 2, wherein the pressure of the high-pressure gas in step G1 is 0.8MPa, and the pressure of the high-pressure gas in step G2 is 0.6 MPa.
4. A tank blow moulding process according to claim 1, characterised in that the moulds (2) on both sides have two parting lines, the cutting line being on the outside and the parting line being on the inside.
5. The blow molding process of the oil tank as claimed in claim 1, wherein in the step C, the middle mold (4) is provided with a plurality of air outlets, the air outlets blow compressed air towards the interior of the cylindrical blank (1), and the cylindrical blank (1) is preformed by vacuum adsorption in cooperation with the molds (2) at the two sides.
6. A tank blow molding process according to claim 1, further comprising, between step F and step D:
and E, after the cutting is finished and before the middle die (4) descends, taking out the redundant outer ring materials generated by cutting by using a material blank manipulator.
7. The blow molding process for fuel tanks according to claim 1, wherein the step H further comprises performing cooling molding and burr trimming on the fuel tanks subjected to blow molding.
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| CN202110653063.7A CN113386323A (en) | 2021-06-11 | 2021-06-11 | Blow molding process for oil tank |
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| CN202110653063.7A CN113386323A (en) | 2021-06-11 | 2021-06-11 | Blow molding process for oil tank |
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| CN103286937A (en) * | 2013-05-23 | 2013-09-11 | 武汉亚普汽车塑料件有限公司 | One-step blow-molding technology for positioning vacuum forming inserting part |
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Application publication date: 20210914 |