CN110884009A - Forming process of external interface of plastic oil tank - Google Patents
Forming process of external interface of plastic oil tank Download PDFInfo
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- CN110884009A CN110884009A CN201911005086.6A CN201911005086A CN110884009A CN 110884009 A CN110884009 A CN 110884009A CN 201911005086 A CN201911005086 A CN 201911005086A CN 110884009 A CN110884009 A CN 110884009A
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- China
- Prior art keywords
- oil tank
- metal nut
- film
- rotational molding
- hot melt
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/20—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. moulding inserts or for coating articles
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—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
- 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
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
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- 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
- B29L2031/7172—Fuel tanks, jerry cans
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Moulding By Coating Moulds (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention relates to a forming process of an external interface of a plastic oil tank, which comprises the following steps: a, forming at least one limiting groove on the outer side wall of the metal nut; b: respectively clamping a C-shaped adhesive tape into each limiting groove of the metal nut; c: locking and installing a metal nut clamped with a C-shaped adhesive tape on a corresponding position of a mold for rotational molding of an oil tank, and adding a PE (polyethylene) granular material for producing the oil tank into the mold for rotational molding of the oil tank; d: performing rotational molding; e: the drilling equipment is used for drilling inwards along the screw hole of the metal nut, redundant materials coated on the screw hole of the metal nut are effectively removed, and the metal nut and the plastic oil tank are matched to form an external interface of the plastic oil tank. The invention adds a layer of adhesive layer on the contact surface of the plastic oil tank and the metal nut, which not only realizes the integrated molding manufacture, but also ensures that the molded oil tank external interface can adapt to the high temperature change without oil leakage.
Description
Technical Field
The invention relates to a local molding process of a plastic oil tank, in particular to a molding process of an external interface of the plastic oil tank.
Background
The plastic oil tank has the advantages of light weight and corrosion resistance, and is widely applied to oil supply equipment in the fields of automobile manufacturing, various processing machines and the like. When the plastic oil tank is used, an external interface of the plastic oil tank with a metal nut is required to be configured for installing an oil discharge bolt or other sensors and detectors. The existing plastic oil tank is generally manufactured by rotational molding, and the external interface of the plastic oil tank is directly and integrally embedded with a metal nut for installing an oil unloading bolt or other sensors and detectors on the oil tank when the oil tank is rotationally molded. Both improved the convenient degree of production, effectively inlayed metal nut whole on the oil tank simultaneously, effectively ensured sealed effect.
After the traditional plastic oil tank is rotationally molded, the plastic oil tank and the metal nut are rigidly connected, and the metal nut and the plastic oil tank are different in material characteristics. Under different environmental temperatures, particularly high-temperature environments, the deformation of the plastic oil tank material caused by thermal expansion is far larger than that of the metal nut. When the deflection difference reaches a certain degree, the connection between the two can generate 'tearing', so that cracks are generated, oil leakage is easily caused, and potential safety hazards are brought to the use of the plastic oil tank.
Therefore, the research and development of the plastic oil tank external interface forming process which can effectively realize integrated forming and manufacturing and can ensure that the integrally formed oil tank external interface can adapt to high-temperature change without causing oil leakage is the research object of the invention.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a forming process of a plastic oil tank external interface, which can effectively solve the problems in the prior art.
The technical scheme of the invention is as follows:
a molding process of an external interface of a plastic oil tank comprises the following steps:
a, forming at least one limiting groove on the outer side wall of the metal nut, wherein the limiting groove is annularly arranged on the outer side wall of the metal nut;
b: respectively clamping a C-shaped adhesive tape into each limiting groove of the metal nut, wherein the C-shaped adhesive tape is formed by hermetically coating a layer of sealing PE film on the periphery of a solid hot melt adhesive;
c: locking and installing a metal nut clamped with a C-shaped adhesive tape on a corresponding position of a mold for rotational molding of an oil tank, adding a PE (polyethylene) granular material for producing the oil tank into the mold for rotational molding of the oil tank, and closing the mold for rotational molding of the oil tank;
the melting point of the material of the sealing PE film is 5-15 ℃ higher than that of the PE granular material for producing the oil tank, and the melting point of the solid hot melt adhesive is 10-20 ℃ lower than that of the PE granular material for producing the oil tank;
d: rotational molding:
1) in the rotational molding process, the heater is used for heating, so that when the air temperature in the mold for rotational molding of the oil tank rises to the melting point of the PE granular material for production of the oil tank, the PE granular material is effectively melted, in the rotational molding process, the melted PE granular material is coated on the outer side wall of the metal nut layer by layer, and before the melting, the solid hot melt adhesive is melted;
2) when the air in the furnace further rises to the melting point of the material of the sealing PE film, the sealing PE film starts to melt, meanwhile, the PE particle material and the solid hot melt adhesive are further melted, and the rotational molding is further carried out;
3) stopping processing by the heater, further raising the air in the furnace to the highest point of 200 +/-20 ℃, enabling the PE granular material to be completely molten, then uniformly coating the PE granular material on the outer side wall of the metal nut through rotational molding, simultaneously sealing the PE film to be completely molten, melting the solid hot melt adhesive in the PE film into a liquid state before the PE film is completely molten, and enabling the liquid hot melt adhesive to be effectively filled between the limiting groove of the metal nut and the molten PE granular material;
4) starting cooling equipment to reduce the temperature of air in the mold for rotational molding of the oil tank to below 70 ℃ within 10 min;
5) continuously cooling to normal temperature, opening the mold and taking out the molded product;
e: the metal nut is integrally embedded on the oil tank, the hole is drilled inwards along the screw hole of the metal nut through the drilling equipment, redundant materials coated on the screw hole of the metal nut are effectively removed, and the metal nut and the plastic oil tank are matched to form an external interface of the plastic oil tank.
The sealing PE film is prepared from HDPE materials, the PE granular material for producing the oil tank is LDPE granular material,
the solid hot melt adhesive is EVA hot melt adhesive.
The thickness of the sealing PE film is at least 0.8 mm.
And d, in the rotational molding process of the step d, gradually heating the air temperature in the mold for rotational molding of the oil tank to the highest point of 200 +/-20 ℃ within 27-32min by using a heater.
And C-shaped adhesive tape in the step b is prepared by adopting a blow molding mode, a sealing PE film made of PE material is placed in a corresponding C-shaped blow molding die, then hot melt adhesive which is heated and melted into a liquid state is adopted to replace air, the liquid hot melt adhesive is extruded into the sealing PE film under the action of high pressure, and the C-shaped adhesive tape coated with the sealing PE film is obtained after cooling and demolding.
The metal nut lateral wall is seted up the spacing groove and is two, just the spacing groove is the second grade ladder groove, C shape adhesive tape card respectively goes into the bottommost of spacing groove.
The invention has the advantages that:
according to the invention, the outer side wall of the metal nut is provided with the limiting groove, and the contact surface between the plastic oil tank and the metal nut is increased through the arrangement of the limiting groove, so that the sealing property between the plastic material and the metal nut is effectively improved. The plastic oil tank is mainly characterized in that on the basis of improving the contact surface, an adhesive layer is additionally arranged on the contact surface of the plastic oil tank and the metal nut, so that the adhesive force between a plastic material and the metal nut can be effectively and greatly improved, and the sealing effect is further improved; and the ductility of the adhesive layer can be used for dealing with the difference of the deformation of the plastic material and the metal nut, so that the generation of cracks between the joint of the plastic material and the metal nut can be completely avoided, the integrated molding manufacturing is realized, and the integrally molded oil tank external interface can adapt to the high-temperature change without generating the oil leakage problem.
The realization that a layer of adhesive layer is additionally arranged on the contact surface of the plastic oil tank and the metal nut needs to solve the biggest technical problem that: how to stably limit the adhesive layer between the metal nut and the plastic material under the high-temperature environment in the rotational molding operation process. 1) The structure of the metal nut is changed, a limiting groove is formed in the outer side wall of the metal nut, and meanwhile, the solid hot melt adhesive is pre-supported into a C shape, so that the solid hot melt adhesive can be effectively limited and installed in the rotational molding process; 2) and secondly, a layer of sealing PE film is hermetically coated on the periphery of the solid hot melt adhesive, specific selection of materials is matched with temperature control in the rotational molding process, the melting point of the material of the sealing PE film is 10-20 ℃ higher than that of the PE granular material for producing the oil tank, the melting point of the material of the solid hot melt adhesive is 5-10 ℃ lower than that of the PE granular material for producing the oil tank, and in the gradual heating process of rotational molding operation, the solid hot melt adhesive is firstly melted, then the PE granular material for producing the oil tank is melted, and finally the sealing PE film is formed. Before the sealed PE film is not melted, the PE granular material is partially melted and is hermetically coated outside the limiting groove of the metal nut in the rotational molding process, and meanwhile, the solid hot melt adhesive is gradually liquefied in the sealed PE film; when the sealing PE film starts to melt, the melting amount of the PE granular material for oil tank production and the solid hot melt adhesive is increased, and in the rotational molding process, the molten PE material for oil tank production can form stable sealing on the outer side of the limiting groove of the metal nut, so that final limiting is effectively formed on the sealing PE film and the hot melt adhesive; before the sealed PE film is completely melted, the PE granular material and the solid hot melt adhesive for oil tank production are completely melted, when rotational molding is heated to the highest temperature point, the sealed PE film is completely melted, the completely melted liquid hot melt adhesive is effectively filled between the plastic material and the metal nut in a limiting mode, the hot melt adhesive is solidified again after cooling, and the effect that a layer of adhesive layer is additionally arranged on the contact surface of the plastic oil tank and the metal nut is achieved.
Drawings
FIG. 1 is a schematic structural view of a C-shaped rubber strip clamped on a metal nut.
Fig. 2 is a schematic structural diagram of the external interface of the plastic oil tank processed by the process of the invention.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings:
a molding process of an external interface of a plastic oil tank comprises the following steps:
as shown in fig. 1, two limiting grooves 11 are formed in the outer side wall of a metal nut 1, the limiting grooves 11 are two-stage stepped grooves, and the limiting grooves 11 are annularly arranged on the outer side wall of the metal nut 1;
b: the metal nut 1 is characterized in that a C-shaped adhesive tape 2 is respectively clamped into each limiting groove 11 of the metal nut 1, the C-shaped adhesive tapes 2 are respectively clamped into the bottommost parts of the limiting grooves 11, the C-shaped adhesive tape 2 is formed by hermetically coating a layer of sealing PE film 22 on the periphery of a solid hot melt adhesive 21, the sealing PE film 22 is prepared from HDPE materials, the thickness of the sealing PE film 22 is 0.8mm, and the solid hot melt adhesive 21 is an EVA hot melt adhesive (in the embodiment, the EVA hot melt adhesive is an RB052 yellow EVA hot melt adhesive produced by commercially available Nonbao adhesive products Co., Ltd., and is suitable for bonding hardware and plastic products and has excellent initial bonding and holding bonding properties, and the viscosity reaches 8000 +/-1500);
c: the method comprises the steps that a metal nut 1 clamped with a C-shaped adhesive tape 2 is locked and installed on a corresponding position of a mold for rotational molding of an oil tank, PE granular materials for production of the oil tank are added into the mold for rotational molding of the oil tank, then the mold for rotational molding of the oil tank is closed, and the PE granular materials for production of the oil tank are LDPE granular materials;
the melting point of the HDPE material is 8 ℃ higher than that of the LDPE granular material, and the melting point of the EVA hot melt adhesive is 12 ℃ lower than that of the LDPE granular material;
d: rotational molding:
1) in the rotational molding process, the heater is used for heating, so that when the air temperature in the mold for rotational molding of the oil tank rises to the melting point (117 ℃) of the PE granular material for production of the oil tank, the PE granular material is effectively melted, in the rotational molding process, the melted PE granular material is coated on the outer side wall of the metal nut layer by layer, and before the melting, the solid hot melt adhesive 21 is melted;
2) when the air in the furnace further rises to the melting point (125 ℃) of the material of the sealing PE film 22, the sealing PE film 22 starts to melt, meanwhile, the PE particle material and the solid hot melt adhesive 21 are further melted, and the rotational molding is further carried out;
3) the heater stops heating after heating for 30min, the air in the furnace further rises to 200 ℃ at the highest point, so that the PE granular material is completely melted and then uniformly coated on the outer side wall of the metal nut 1 through rotational molding, meanwhile, the PE film 22 is sealed to be completely melted, the solid hot melt adhesive 21 in the PE film is melted into a liquid state before the PE granular material is completely melted, and the liquid hot melt adhesive is effectively filled between the limiting groove 11 of the metal nut 1 and the melted PE granular material (a small amount of melted PE film material can be mixed in the filled hot melt adhesive, and excessive influence on the adhesiveness and the ductility of the cooled and solidified hot melt adhesive can not be caused due to small amount);
4) starting cooling equipment to reduce the temperature of air in the mold for rotational molding of the oil tank to below 70 ℃ within 10 min;
5) continuously cooling to normal temperature, opening the mold and taking out the molded product;
e: the metal nut 1 is integrally embedded on the oil tank 3, a hole is drilled inwards along a screw hole of the metal nut 1 through drilling equipment, redundant materials coated on the screw hole of the metal nut 1 are effectively removed, and the metal nut 1 and the plastic oil tank 3 are matched to form an external interface of the plastic oil tank, wherein the specific structure is shown in fig. 2.
The C-shaped adhesive tape 2 in the step b is prepared by adopting a blow molding method, the sealing PE film 22 made of PE material is placed in a corresponding C-shaped blow molding die, then a hot melt adhesive melted into a liquid state by heating is used to replace air, the liquid hot melt adhesive is extruded into the sealing PE film 22 under the action of high pressure, and the C-shaped adhesive tape 2 coated with the sealing PE film 22 is obtained by demolding after cooling (the preparation method of the C-shaped adhesive tape in the present application is not limited to this embodiment).
According to the plastic oil tank external interface processed and prepared by the molding process, the arrangement of the limiting groove 11 on the metal nut 1 effectively increases the contact surface between the plastic oil tank 3 and the metal nut 1, and on the basis of improving the contact surface, the adhesive layer is additionally arranged on the contact surface between the plastic oil tank 3 and the metal nut 1, so that the adhesive force between a plastic material and the metal nut 1 can be effectively and greatly improved, and the sealing effect is further improved; and the ductility of the adhesive layer can be used for dealing with the difference of the deformation of the plastic material and the metal nut 1, so that the generation of cracks between the joint of the plastic material and the metal nut 1 can be completely avoided, the integrated molding manufacturing is realized, and the integrally molded oil tank external interface can adapt to the high-temperature change without generating the oil leakage problem.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A molding process of an external interface of a plastic oil tank is characterized by comprising the following steps:
a, forming at least one limiting groove on the outer side wall of the metal nut, wherein the limiting groove is annularly arranged on the outer side wall of the metal nut;
b: respectively clamping a C-shaped adhesive tape into each limiting groove of the metal nut, wherein the C-shaped adhesive tape is formed by hermetically coating a layer of sealing PE film on the periphery of a solid hot melt adhesive;
c: locking and installing a metal nut clamped with a C-shaped adhesive tape on a corresponding position of a mold for rotational molding of an oil tank, adding a PE (polyethylene) granular material for producing the oil tank into the mold for rotational molding of the oil tank, and closing the mold for rotational molding of the oil tank;
the melting point of the material of the sealing PE film is 5-15 ℃ higher than that of the PE granular material for producing the oil tank, and the melting point of the solid hot melt adhesive is 10-20 ℃ lower than that of the PE granular material for producing the oil tank;
d: rotational molding:
1) in the rotational molding process, the heater is used for heating, so that when the air temperature in the mold for rotational molding of the oil tank rises to the melting point of the PE granular material for production of the oil tank, the PE granular material is effectively melted, in the rotational molding process, the melted PE granular material is coated on the outer side wall of the metal nut layer by layer, and before the melting, the solid hot melt adhesive is melted;
2) when the air in the furnace further rises to the melting point of the material of the sealing PE film, the sealing PE film starts to melt, meanwhile, the PE particle material and the solid hot melt adhesive are further melted, and the rotational molding is further carried out;
3) stopping processing by the heater, further raising the air in the furnace to the highest point of 200 +/-20 ℃, enabling the PE granular material to be completely molten, then uniformly coating the PE granular material on the outer side wall of the metal nut through rotational molding, simultaneously sealing the PE film to be completely molten, melting the solid hot melt adhesive in the PE film into a liquid state before the PE film is completely molten, and enabling the liquid hot melt adhesive to be effectively filled between the limiting groove of the metal nut and the molten PE granular material;
4) starting cooling equipment to reduce the temperature of air in the mold for rotational molding of the oil tank to below 70 ℃ within 10 min;
5) continuously cooling to normal temperature, opening the mold and taking out the molded product;
e: the metal nut is integrally embedded on the oil tank, the hole is drilled inwards along the screw hole of the metal nut through the drilling equipment, redundant materials coated on the screw hole of the metal nut are effectively removed, and the metal nut and the plastic oil tank are matched to form an external interface of the plastic oil tank.
2. The molding process of the external interface of the plastic oil tank as claimed in claim 1, wherein: the sealing PE film is made of HDPE materials, the PE granular materials for oil tank production are LDPE granular materials, and the solid hot melt adhesive is EVA hot melt adhesive.
3. The molding process of the external interface of the plastic oil tank as claimed in claim 2, wherein: the thickness of the sealing PE film is at least 0.8 mm.
4. The molding process of the external interface of the plastic oil tank as claimed in claim 1, wherein: and d, in the rotational molding process of the step d, gradually heating the air temperature in the mold for rotational molding of the oil tank to the highest point of 200 +/-20 ℃ within 27-32min by using a heater.
5. The molding process of the external interface of the plastic oil tank as claimed in claim 1, wherein: and C-shaped adhesive tape in the step b is prepared by adopting a blow molding mode, a sealing PE film made of PE material is placed in a corresponding C-shaped blow molding die, then hot melt adhesive which is heated and melted into a liquid state is adopted to replace air, the liquid hot melt adhesive is extruded into the sealing PE film under the action of high pressure, and the C-shaped adhesive tape coated with the sealing PE film is obtained after cooling and demolding.
6. The molding process of the external interface of the plastic oil tank as claimed in claim 1, wherein: the metal nut lateral wall is seted up the spacing groove and is two, just the spacing groove is the second grade ladder groove, C shape adhesive tape card respectively goes into the bottommost of spacing groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911005086.6A CN110884009B (en) | 2019-10-22 | 2019-10-22 | Forming process of external interface of plastic oil tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911005086.6A CN110884009B (en) | 2019-10-22 | 2019-10-22 | Forming process of external interface of plastic oil tank |
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| CN110884009A true CN110884009A (en) | 2020-03-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111531771A (en) * | 2020-04-10 | 2020-08-14 | 广东冷源冷链科技有限公司 | Rotational molding integrated forming process for plastic shell and metal liner |
| CN111673971A (en) * | 2020-06-12 | 2020-09-18 | 贵州航天精工制造有限公司 | Soft oil tank bag opening forming process and structure |
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| CN111531771A (en) * | 2020-04-10 | 2020-08-14 | 广东冷源冷链科技有限公司 | Rotational molding integrated forming process for plastic shell and metal liner |
| CN111673971A (en) * | 2020-06-12 | 2020-09-18 | 贵州航天精工制造有限公司 | Soft oil tank bag opening forming process and structure |
| CN111673971B (en) * | 2020-06-12 | 2022-07-12 | 贵州航天精工制造有限公司 | Soft oil tank bag opening forming process and structure |
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