KR101774115B1 - Forming apparatus of plastic fuel tank and forming method of plastic fuel tank by apparatus thereof - Google Patents

Forming apparatus of plastic fuel tank and forming method of plastic fuel tank by apparatus thereof Download PDF

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Publication number
KR101774115B1
KR101774115B1 KR1020150179153A KR20150179153A KR101774115B1 KR 101774115 B1 KR101774115 B1 KR 101774115B1 KR 1020150179153 A KR1020150179153 A KR 1020150179153A KR 20150179153 A KR20150179153 A KR 20150179153A KR 101774115 B1 KR101774115 B1 KR 101774115B1
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South Korea
Prior art keywords
parison
mold
baffle
fuel tank
plastic fuel
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KR1020150179153A
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Korean (ko)
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KR20170071655A (en
Inventor
정대근
유제혁
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주식회사 동희산업
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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
    • B29C49/421—
    • 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
    • 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
    • B60K15/03177—Fuel tanks made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material
    • 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
    • B60K2015/03486—Fuel tanks characterised by the materials the tank or parts thereof are essentially made from
    • B60K2015/03493—Fuel tanks characterised by the materials the tank or parts thereof are essentially made from made of plastics

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a molding apparatus for a plastic fuel tank and a molding method of a plastic fuel tank for a vehicle using the apparatus. In manufacturing the plastic fuel tank 500 through blow molding, The weld line 510 is formed in a straight line on the surface of the plastic fuel tank 500 that has been manufactured by thermally fusing the weld.

Figure R1020150179153

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic fuel tank molding apparatus and a molding method of a plastic fuel tank for a vehicle using the apparatus. 2. Description of the Related Art [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a molding apparatus for a plastic fuel tank and a molding method of a plastic fuel tank for a vehicle using the same, and more particularly to a molding method for molding a plastic fuel tank using blow molding, The present invention relates to a molding apparatus for a plastic fuel tank capable of improving quality problems with respect to durability as well as a molding method of a plastic fuel tank for a vehicle using the apparatus.

2. Description of the Related Art Generally, an engine of a vehicle is a device that converts thermal energy into mechanical rotational force by rotating a crankshaft using an explosive force generated by burning fuel in a combustion chamber.

In such an engine, fuel to be burned in the combustion chamber is continuously supplied, and a fuel tank capable of storing a certain amount of fuel in the vehicle is provided for continuous supply of fuel.

The fuel tank is usually made of steel and plastic. In recent years, however, the use of plastic fuel tanks for weight reduction and fuel economy improvement is increasing.

The plastic fuel tank is largely manufactured by a melting process, an extrusion process, and a blowing process. The melting process is a process of melting a plastic material by heating it to a high temperature and melting it with a molten resin. twin sheet, and cylindrical shape. In the blowing process, the parison is injected into the mold and the high-pressure air is blown into the parison to mold the parison into the shape of the fuel tank .

The plastic baffle is placed inside the parison and then the blowing process is performed. Accordingly, as the parison and the plastic baffle are fusion-bonded to each other in the course of the blowing process, An integrally bonded plastic fuel tank is produced.

On the other hand, the blowing process is performed through two steps of primary blowing and secondary blowing.

The primary blowing is a process for imparting stretchability to the parison by improving the fluidity of the resin. The secondary blowing is a process for molding the parison to which elasticity is imparted in the shape of a fuel tank. If the blowing process is a primary blowing, If the molding is performed in one step without dividing into two stages of the secondary blowing, high pressure air acts on the parison, which is not given elasticity, so that quality problems occur in the completed fuel tank, and in some cases, In order to prevent this, there are two stages of primary blowing (pre-blowing) and secondary blowing.

The primary blowing proceeds in a state in which the mold is released, and the secondary blowing proceeds in a state in which the metal mold is joined.

1, a parison fusing line 11 is formed on the surface of the plastic fuel tank 10 that has been manufactured by blow molding. The fusing line 11 is formed in a straight line 12, , But a part of the section is formed in the form of a bunched portion 13 in which the straight line 12 is formed, and the bunched portion 13 is generated during the secondary blowing process in a conventional molding apparatus.

2, the concave portion 14 and the convex portion 15 located on both sides of the concave portion 14 are formed such that the thickness of the concave portion 14 is smaller than the thickness of the concave portion 14, And the convex portion 15 is formed such that the thickness of the resin is relatively thicker than the peripheral portion.

The convex portion 15 having a large thickness is contracted at the time of cooling after the heat fusion and pulls the concave portion 14 located in the periphery while the concave portion 14 becomes thinner due to the pulling action, And a notch 14a is formed at the thinnest portion.

The fuel tank 10 is subjected to an endurance test by applying a free fall or a blow to the fuel tank 10. At this time, cracks are generated in the concave portion 14 having a thin thickness at the aggregation portion 13 and a notch 14a formed therein There is a disadvantage in that the defective rate of the product increases.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

Korean Patent Publication No. 10-2010-0016339

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-described drawbacks, and it is an object of the present invention to provide a fuel tank in which, when a plastic fuel tank is manufactured through blow molding, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a molding apparatus for a plastic fuel tank and a molding method of a plastic fuel tank for a vehicle using the apparatus.

According to an aspect of the present invention, there is provided a molding apparatus for blow molding a parison made of a plastic molten resin into a shape of a plastic fuel tank, A lower mold having a lower cavity formed therein to accommodate only a section and performing a merging and releasing operation; And an upper mold having an upper cavity formed therein for receiving the remaining section of the parison not accommodated in the lower cavity, and an upper mold located in the lower gold shape and performing the assembling and releasing operations.

And a baffle pin provided with an air hole for primary blow molding of the parison and having a baffle fitted at an upper end thereof and capable of being inserted into or removed from the parison through an opened lower end of the parison .

A PCD which is located below the lower mold and is installed to be capable of closing operation and opening operation and which closes the lower end of the parison in a closing operation in a state where the baffle pin into which the baffle is inserted is inserted into the parison .

And a parison robot which closes the upper end of the parison by holding the upper end of the parison and moving the parison to the upper cavity and the lower cavity before the parison is firstly blow molded.

An air hole is formed for the secondary blow molding of the parison, which is inserted through one of the lower mold and the upper mold, and the end of which is inserted into the parison through the parison at the time of insertion, And a formed needle pin.

The lower mold and the upper mold are provided with mold protrusions for fixing the baffles located inside the parison when the upper mold and the lower mold are assembled.

The lower mold and the upper mold may be composed of first and second lower molds and first and second upper molds, And mold protrusions are provided on the first and second lower molds and the first and second upper molds, respectively.

Wherein the baffle pin having the baffle inserted therein is inserted into the inside of the parison in a state where both the lower mold and the upper mold are released, and the upper and lower ends of the parison are sealed before proceeding. do.

After completion of the primary blow molding of the parison, the upper mold is assembled, so that the mold projection of the upper mold fixes the upper end of the baffle; After the baffle is fixed by the mold projection of the upper mold, the baffle pin moves backward only to the position of the PCD for airtightness of the parison; After the baffle pin is retracted, the lower mold is assembled so that the mold protrusion of the lower mold fixes the lower end of the baffle and maintains airtightness of the parison; And then the secondary fin is blown into the parison after the needle pin is inserted into the parison in a state where the lower mold is assembled.

In addition, a parison fusing line is formed on the surface of the fuel tank manufactured using the apparatus according to the present invention, and the fusing line is formed only in a straight line from one end to the other end.

According to the present invention, in manufacturing a plastic fuel tank through blow molding, a parison is pressed only by a metal mold to thermally fuse the parison, thereby forming a fusion line made of straight lines on the surface of the plastic fuel tank This makes it possible to improve the durability of the molded plastic fuel tank and to prevent cracks from occurring in the fusion line during the durability test, thereby improving the quality problem of the product and further improving the merchantability There is an effect that can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a prior art drawing showing a lump in a fusion line in a plastic fuel tank produced by blow molding;
2 is a sectional view taken along the line I-I in Fig. 1,
3 is a process diagram for explaining a process of molding a plastic fuel tank using the apparatus according to the present invention,
4 and 5 are views for explaining baffle pins and needle pins used in the apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a molding apparatus for a plastic fuel tank according to a preferred embodiment of the present invention and a molding method of a plastic fuel tank for a vehicle using the apparatus will be described in detail with reference to the accompanying drawings.

FIG. 3 shows a plastic fuel tank using the apparatus according to the present invention and a plastic fuel tank having been manufactured.

The molding apparatus according to the present invention includes a lower mold 110 and an upper mold 120 individually assembling and releasing. The lower mold 110 includes a first lower mold 111, And the second lower mold 112. The upper mold 120 is composed of a first upper mold 121 and a second upper mold 122 which perform a merging and releasing operation with respect to each other.

The lower cavity 110 and the upper cavity 120 are formed with a lower cavity 113 and an upper cavity 123 for receiving the parison 200. [

The first and second lower molds 111 and 112 are respectively provided with mold protrusions 114 for fixing the lower end of the baffle 300 when the lower mold 110 is assembled, And a mold protrusion 124 for fixing the upper end of the baffle 300 when the upper mold 120 is assembled.

The apparatus according to the present invention further includes a baffle pin 130 in which an air hole 131 is formed for primary blow molding of the parison 200 into which the baffle 300 is inserted; The baffle 300 is positioned below the lower mold 100 so that the baffle 300 can be closed and opened. When the baffle pin 130 is inserted into the parison 200, (PCD) 140 to seal the open lower end of the pedestal 200; The upper part of the parison 200 is held in the upper cavity 113 and the lower cavity 123 by holding the upper end of the parison 200 and the upper part of the parison 200 is closed before the primary blow- A parison robot 150 for making a robot; The mold is inserted through any one of the lower mold 110 and the upper mold 120. When the insert is inserted into the parison 200 through the parison 200 at the time of insertion, And a needle pin 160 having an air hole 161 formed therein for secondary blow molding of the recipe 200.

Hereinafter, the molding apparatus according to the present invention will be described in more detail through a process of manufacturing a plastic fuel tank by blow molding.

When the plastic material is melted as a molten resin by heat at a high temperature in the melting machine, the melted resin has a shape of C shape, twin sheet or cylindrical shape through the head core 400 of the extruder as shown in Fig. 3 (A) The parison 200 is extruded and extruded into a parison 200 and is separated from the head core 400 with the upper end held by the parison robot 150.

The parison 200 held by the parison robot 150 is moved between the first and second lower molds 111 and 112 and the first and second upper molds 121 and 122 as shown in FIG. The upper end of the parison 200 is closed by the closing of the robot 150 and the baffle pin 130 in which the baffle 300 is inserted through the lower end of the opened parison 200 is inserted into the inside of the parison 200 And the lower end of the parison 2 is also sealed as the PCD 140 is closed after the baffle pin 130 is inserted.

4, a protrusion 131 is formed at an upper end of the baffle pin 130 and a groove 310 is formed at a lower end of the baffle 300 to receive the protrusion 131. The baffle pin 130 has an upper end So that the baffle 300 is inserted.

After the upper and lower ends of the parison 200 are sealed by the parison robot 150 and the PCD 140, high pressure air is supplied to the parison 200 through the air holes 132 provided in the baffle pins 130. [ The preform is blown into the inside of the parison 200 to improve the fluidity of the resin through the primary blow molding so that the parison 200 is stretchable.

The primary blow molding of the parison 200 proceeds with the lower mold 110 and the upper mold 120 both being released as shown in FIG. 3 (B).

When the primary blow molding is completed, the first and second upper molds 121 and 122, which were formed as shown in FIG. 3C, are merged and the mold protrusions 124 provided in the first and second upper molds 121 and 122, The parison 200 and the upper end of the baffle 300 are first welded together as the parison 200 is pressed.

The upper end of the baffle 300 is fixed by the mold protrusions 124 of the first and second upper molds 121 and 122 so that the baffle pin 130 retreats only to the position of the PCD 140 as shown in FIG. After the baffle pin 130 moves, the first and second lower molds 111 and 112 are joined together and the mold protrusions 114 provided in the first and second lower molds 111 and 112 are assembled together, The parison 200 and the lower end of the baffle 300 are fusion-bonded together.

When the baffle pins 130 are completely withdrawn to the lower side of the PCD 140 without being moved backward only to the position of the PCD 140, the parison 200 is filled with air through the primary blowing, Air in the lower part of the parison 200 is not maintained and air inside the parison 200 falls outside the parison 200. In this case, the moldability is deteriorated at the time of secondary blow molding which will be described later.

Accordingly, when the baffle pin 130 is moved backward after the primary blow molding of the parison 200, only the position of the PCD 140 is moved so that the airtightness of the parison 200 can be maintained constantly, It is possible to improve the moldability of the parison 200 during the secondary blow molding.

When the baffle pins 130 are retracted, the upper ends of the baffles 300 are fixed by the mold protrusions 124 provided on the first and second upper molds 121 and 122. Therefore, 200 and only the baffle pin 130 moves backward.

After the baffle pin 130 is retracted to the position of the PCD 140 and the first and second lower molds 111 and 112 are assembled, the upper end of the parison 200 is closed by the upper mold 120 And the lower end of the parison 200 is maintained in a closed state by the lower mold 110.

When the lower end of the parison 200 is sealed as the lower mold 110 is assembled, the needle pin 160 is inserted through one of the upper and lower molds 120 and 110 as shown in FIG. 4 (E) The tip of the needle pin 160 penetrates the parison 200 and is positioned inside the parison 200.

5, when the tip of the needle pin 160 is positioned inside the parison 200, high-pressure air flows through the air hole 161 provided in the needle pin 160 200, so that the parison 200 is subjected to secondary blow molding, and the parison 200 is formed into the shape of the fuel tank through the secondary blowing.

After the parison 200 is formed in the shape of the fuel tank through the secondary blowing, the needle pins 160 are removed from the mold, the upper and lower molds 120 and 110 are released again, and the upper and lower molds 120, and 110) to take out the plastic fuel tank 500 that has been molded as shown in Fig. 4 (F), thereby ending the blow molding.

The fusing line 510 is formed on the surface of the plastic fuel tank 500 that has been manufactured using the apparatus as described above. The fusing line 510 connects the lower cavity 120 (110) And the parison 200 in the upper cavity 123 are joined together by thermal fusion. The fusing line 510 according to the present invention is formed in only one straight line from one end to the other end.

That is, the molding apparatus according to the present invention has a configuration in which the parison 200 is pressed and thermally fused with only the upper and lower dies 120 and 110, so that the plastic fuel tank 500, The fusing line 510 is formed. In particular, the conventional fusing line 510 does not exist, so that the durability of the fuel tank 500 can be greatly improved. Further, It is possible to eliminate the phenomenon that cracks are generated in the fusion line 510 when the tank 500 is subjected to the free fall or strike to perform the durability test. As a result, the quality problem of the product can be improved, There is an advantage to be able to do.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

110 - Lower mold 120 - Upper mold
130 - Baffle pin 140 - PCD
150 - Brush with parison 160 - Needle pin
200 - Parison 300 - Baffle
400 - Head Core 500 - Plastic Fuel Tank
510 - Fused line

Claims (10)

A molding apparatus of a plastic fuel tank for blow molding a parison made of a plastic molten resin into a shape of a plastic fuel tank,
A lower mold having a lower cavity formed to accommodate only a part of the parison along the longitudinal direction of the parison,
An upper mold having an upper cavity formed to receive the remaining section of the parison not accommodated in the lower cavity, and an upper mold positioned in the lower gold shape to perform a piling and release operation;
A baffle pin provided with an air hole for primary blow molding of the parison, a baffle mounted at an upper end thereof, and a baffle pin installed to be inserted into or removed from the parison through an opened lower end of the parison;
A PCD disposed below the lower mold to close and open the baffle and seal the lower end of the parison when the baffle pin is inserted into the parison;
A parison robot that holds the top of the parison to seal the top of the parison before the parison is firstly blow molded by moving the parison to the top cavity and the bottom cavity;
An air hole is formed for the secondary blow molding of the parison, which is inserted through one of the lower mold and the upper mold, and the end of which is inserted into the parison through the parison at the time of insertion, A formed needle pin;
Wherein the lower mold and the upper mold have mold protrusions for fixing the baffle located inside the parison when the upper mold and the lower mold are assembled;
The lower mold and the upper mold may be composed of first and second lower molds and first and second upper molds,
Wherein the first and second lower molds and the first and second upper molds are provided with mold protrusions, respectively. delete delete delete delete delete delete A method of forming a plastic fuel tank using the apparatus of claim 1,
In the primary blow molding of the parison, the baffle pin into which the baffle is inserted in the state where both the lower mold and the upper mold are released is inserted into the parison, and the upper and lower ends of the parison are sealed after the parison is closed;
After completion of the primary blow molding of the parison, the upper mold is assembled, so that the mold projection of the upper mold fixes the upper end of the baffle;
After the baffle is fixed by the mold projection of the upper mold, the baffle pin moves backward only to the position of the PCD for airtightness of the parison;
After the baffle pin is retracted, the lower mold is assembled so that the mold protrusion of the lower mold fixes the lower end of the baffle and maintains airtightness of the parison;
Wherein the lower end of the lower mold is inserted into the parison, and then the secondary blow molding of the parison is performed after the needle pin is inserted into the parison. delete delete
KR1020150179153A 2015-12-15 2015-12-15 Forming apparatus of plastic fuel tank and forming method of plastic fuel tank by apparatus thereof KR101774115B1 (en)

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Publication number Priority date Publication date Assignee Title
KR101084002B1 (en) * 2003-09-03 2011-11-16 티아이 그룹 오토모티브 시스템즈 엘엘씨 Method and apparatus for making a blow molded fuel tank

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101084002B1 (en) * 2003-09-03 2011-11-16 티아이 그룹 오토모티브 시스템즈 엘엘씨 Method and apparatus for making a blow molded fuel tank

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