WO2014180018A1 - 一种带辅助阳模的两片吹塑中空箱体成型方法 - Google Patents

一种带辅助阳模的两片吹塑中空箱体成型方法 Download PDF

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Publication number
WO2014180018A1
WO2014180018A1 PCT/CN2013/077015 CN2013077015W WO2014180018A1 WO 2014180018 A1 WO2014180018 A1 WO 2014180018A1 CN 2013077015 W CN2013077015 W CN 2013077015W WO 2014180018 A1 WO2014180018 A1 WO 2014180018A1
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WO
WIPO (PCT)
Prior art keywords
mold
parison
auxiliary male
male mold
template
Prior art date
Application number
PCT/CN2013/077015
Other languages
English (en)
French (fr)
Inventor
孙岩
姜林
徐松俊
刘亮
高德俊
王晔
吴陆顺
李�杰
苏卫东
王昌儒
李晓军
杨全周
Original Assignee
亚普汽车部件股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 亚普汽车部件股份有限公司 filed Critical 亚普汽车部件股份有限公司
Priority to BR112014016773-7A priority Critical patent/BR112014016773B1/pt
Priority to US14/376,597 priority patent/US10245773B2/en
Priority to RU2014130819/05A priority patent/RU2589162C2/ru
Priority to IN1410MUN2014 priority patent/IN2014MN01410A/en
Priority to ES13863665.9T priority patent/ES2569986T3/es
Priority to PL13863665T priority patent/PL2839945T3/pl
Priority to JP2015515384A priority patent/JP5828991B2/ja
Priority to KR1020147022804A priority patent/KR101590878B1/ko
Priority to EP13863665.9A priority patent/EP2839945B1/en
Publication of WO2014180018A1 publication Critical patent/WO2014180018A1/zh

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Classifications

    • 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
    • B29C49/06905—Using combined techniques for making the preform
    • B29C49/0691—Using combined techniques for making the preform using sheet like material, e.g. sheet blow-moulding from joined sheets
    • 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
    • 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
    • B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/28—Blow-moulding apparatus
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/4247—Means for deforming the parison prior to the blowing operation using spreading or extending means
    • 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
    • B29C49/4252—Auxiliary operations prior to the blow-moulding operation not otherwise provided for
    • 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
    • B29C49/20—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
    • B29C2049/2073—Means for feeding the inserts into the mould, preform or parison, e.g. grippers
    • 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
    • B29C2049/2073—Means for feeding the inserts into the mould, preform or parison, e.g. grippers
    • B29C2049/2082—Feeding the insert and the preform at the same time, e.g. using the same feeding means for the insert and the preform
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/079—Auxiliary parts or inserts
    • B29C2949/08—Preforms made of several individual parts, e.g. by welding or gluing parts together
    • 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
    • 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

Definitions

  • the invention relates to a method for forming a blown hollow body, in particular to a method for forming a two-piece blown hollow body with an auxiliary male mold, which is particularly suitable for the field of fuel box blow molding.
  • HDPE6 layer co-extrusion blow molding technology with EV0H fuel barrier layer is the mainstream technology of plastic fuel tank manufacturing today.
  • relevant policies and regulations have imposed strict requirements on automobile OEMs, such as California has introduced PZEV, a zero-emissions regulatory requirement.
  • PZEV a zero-emissions regulatory requirement.
  • the total evaporative emissions include gasoline in the fuel tank body, welding surfaces and fittings, and evaporative discharge of seals, etc., generally in the hundreds of mg / 24h, so the PZEV emission standard for plastic fuel tanks Said very harsh.
  • patent PCT/CN2012/081100 deals with how to improve the quality of the product and the design of the tool while reducing the cost of the equipment and the product, reducing the evaporation of the hollow box, and the built-in large
  • the components of the components such as the anti-wave plate built-in valve tube and the like.
  • the minimum wall thickness is not less than 3mm
  • the thickness of the welding surface is not less than 3. 5mm, and it is more difficult to meet the wall thickness requirement for the area with larger stretching, and for the cost of the single piece of the product.
  • the wall thickness of the parison cannot be increased too much, and the wall thickness control method of the existing two-piece parison die cannot adjust the effective wall thickness to the local area where the stretching is large to meet the minimum wall thickness requirement.
  • the fuel tank with a more complicated shape and a partial height is highlighted.
  • the uniformity of high wall thickness distribution reduces the weight of the product and the cost per piece is an urgent problem to be solved. Summary of the invention
  • the invention is directed to the technical problems existing in the prior art, and provides a two-piece blow molding hollow box forming method with an auxiliary male mold which is simple in structure, convenient in operation and low in cost, and can also realize a large built-in component with a method.
  • the two-piece hollow box blow molding method by partially pre-stretching the molten plastic parison, and then forming by vacuum or air pressure, can form a larger draw ratio and a more uniform wall thickness distribution, and can make the fuel tank
  • the shape has greater design freedom and better product molding quality.
  • the technical solution of the present invention is as follows: a two-piece blow molding hollow box molding method with an auxiliary male mold, characterized in that the molding method comprises the following steps,
  • the auxiliary male mold on the pre-formed template in the step 3 is set as a split structure, and the specific steps are as follows, 31) the mold half mold and the preform template are closed.
  • the actuator drives the auxiliary male mold to move toward the inner wall of the mold cavity to realize pre-stretching of the parison, and the actuator includes a cylinder, a cylinder or a motor-driven mechanism.
  • the auxiliary male mold on the pre-formed template in the step 3 is set as a split structure, and the specific steps are as follows: 31) After the mold half mold and the preform template are closed, The vacuum adsorbing the parison in the mold, while adsorbing, the actuator drives the auxiliary male mold to move toward the inner wall of the mold cavity to realize pre-stretching of the parison; the actuator includes a cylinder, an oil cylinder or a motor-driven mechanism.
  • the actuator drives the auxiliary male mold to move toward the inner wall of the mold cavity, and the molten parison is pre-stretched under the promotion of the auxiliary male mold to realize pre-stretching of the parison; and pre-stretching the parison by using the auxiliary male mold
  • the auxiliary parison region is first pre-stretched by the auxiliary male mold, and once the parison contacts the auxiliary male mold, the molten parison and the auxiliary male mold are well slid.
  • the action of the friction behavior is pre-stretched, so that it can maintain a good wall thickness distribution, overcome the problem of wall thickness deviation of the conventional parison stretching, and form a fuel tank with more complicated shape and larger draw ratio.
  • the mold cavity While the mold cavity is being evacuated, the molten parison is pushed, and the parison is pre-stretched by the movement of the inner wall of the mold cavity.
  • the parison inside the fuel tank is blow-molded by high-pressure gas, and the parison is attached to the inner surface of the mold cavity to obtain two pieces of the casing which are fitted inside the mold half mold.
  • the auxiliary male mold on the pre-formed template in the step 3 is set as a unitary structure, and the specific steps are as follows. 31) During the process of closing the mold half mold and the preformed template, the mold half The mold pushes the parison to the auxiliary male mold in the preforming template, and after the parison contacts the auxiliary male mold, the parison is stretched to realize pre-stretching of the parison; 32) the mold half mold and the preform template are closed After that, the sheet parison is cut.
  • the auxiliary male mold on the pre-formed template in the step 3 is provided as a unitary structure, which further comprises the following steps, 33) after the material is cut, the vacuum adsorption type in the mold Billet.
  • the auxiliary stretching process is completed after the preform mold half mold and the preform template are completely closed, and the auxiliary stretching is mainly caused by the mold half mold pressing the parison into the preform template.
  • the male mold, once contacted with the auxiliary male mold is pre-stretched due to the good sliding and frictional action of the molten parison and the auxiliary male mold, so that a good wall thickness distribution can be maintained, and the shape can be better formed.
  • the complex and high-grade fuel tank better meets the requirements of the minimum wall thickness at which the parison is stretched.
  • the auxiliary male mold on the pre-formed template in the step 3 is set as a split structure which is merged together, and the specific steps are as follows, 31) after the mold half mold and the preform template are closed, The vacuum adsorbing the parison in the mold, while adsorbing, the actuator drives the auxiliary male mold to move toward the inner wall of the mold cavity to realize pre-stretching of the parison.
  • the auxiliary male mold on the pre-formed template in the step 3 is set as a split type structure which is merged together, and the specific steps are as follows.
  • the mold half mold squeezes the parison into the auxiliary male mold in the preform template, and after the parison contacts the auxiliary male mold, the parison is stretched, that is, the pair is realized.
  • the actuator drives the auxiliary male mold to move toward the inner wall of the mold cavity to realize the second pre-stretching of the parison.
  • the auxiliary male mold on the preforming template is arranged as a combined split structure, and the actuator includes a cylinder, a cylinder or a motor-driven mechanism.
  • the split parison is used to assist the drawing of the molten parison, that is, the first auxiliary drawing process has been completed, and the mold half mold and the preform template are completely completed.
  • the split auxiliary male mold is opened, the parison is moved to the inner wall of the mold cavity, and the second auxiliary stretching is performed, and the stretching is performed twice to obtain a better auxiliary stretching function, so that the wall thickness distribution is better. More uniform, better shape of the fuel tank with complex shape and larger draw ratio.
  • the internal high pressure blow molding in the step 4 after the preforming is completed, before the mold is opened, the following steps are further included, 41) the auxiliary male mold is returned to the initial position by the actuator.
  • the technical solution is mainly for the auxiliary male mold to be set as a split structure. When the auxiliary male mold completes the stretching of the parison, it returns to the initial position, so as to continue the subsequent steps.
  • the auxiliary male mold is one or a combination of polytetrafluoroethylene and epoxy resin.
  • the auxiliary male mold is generally required to not cause a rapid decrease in the temperature of the parison when it is applied to push the parison, so that the auxiliary male mold preferably uses a material having a lower thermal conductivity. Since the temperature of the molten parison in contact may generally require a high temperature of 190 degrees Celsius, the material should also have high temperature resistance properties, such as engineering materials such as polytetrafluoroethylene, epoxy resin, and wood materials, which can meet the material performance requirements of the mechanism.
  • the molding method further comprises a breaking step of the parison blank, which is disposed before the high pressure blow molding inside the step 4 or simultaneously with the high pressure blow molding, the mold half mold After the pre-formed template is closed, the parison can be cut off; the broken material is cut by the external cutting or the die and the core is closed, and the preparation of the molten parison is prepared for continuous production.
  • the pre-formed template with the auxiliary male mold exits the position in the middle of the mold and then connects the built-in assembly with the preformed parison.
  • the robot arm first moves the clamped internal assembly mechanism with the built-in parts to the mold. The location of the built-in part.
  • a built-in mechanism of the mechanical structure fixing component can be used to enhance the rigidity of the built-in mechanism of the component, prevent sway during the built-in process of the component, improve the positional accuracy of the built-in component, and improve the built-in The quality of the connection.
  • the built-in parts generally include a valve tube assembly, an oil and gas separation device, a secondary pump sensor, a wave protection plate, a pipe clamp, and the like.
  • the robot arm has a pushing device such as a cylinder, a cylinder or a motor for connecting the built-in parts with the parison inside the mold cavity.
  • This connection can be one of welding, welding or riveting.
  • the welding or welding process requires a hot plate or infrared preheating before the connection to achieve better connection performance.
  • the mechanism exits the middle position of the mold, and the final closing of the two pieces of the mold is performed. After the closing, the high-pressure blow molding is performed again to realize the welding of the two upper and lower shells, and the belt is obtained.
  • Plastic fuel tank with built-in parts are connected by the built-in mechanism of the robot arm assembly.
  • the advantages of the present invention are as follows with respect to the prior art.
  • the present invention provides a method of blow molding a two-piece parison plastic hollow body, particularly a plastic fuel tank, and realizes the connection of a large built-in component to the inner wall of the fuel tank.
  • the auxiliary male mold is used to realize the auxiliary stretching of the parison stretching region, which compensates for the limitation of the two parison wall thickness control system, and forms the pull-out
  • the shape of the fuel tank has greater design freedom, ensuring better product quality.
  • Figure 1 is a schematic view of two pieces of plastic parison blanking and equipment tooling
  • Figure 2 shows the mold pre-molding of the mold half mold and the preformed template for closing and breaking, and high pressure blowing
  • Figure 3 is a schematic view showing the mold opening and the preforming template exiting
  • Figure 4 is a schematic diagram showing the connection of the built-in components of the component built-in mechanism
  • Figure 5 is a schematic view showing the removal of the built-in mechanism of the component after the internal component is connected with the fuel tank housing;
  • Figure 6 is a schematic diagram of the secondary closure of the mold half mold;
  • Figure 7 is a schematic view showing the structure of the molding oil tank taken out after the mold is opened;
  • Figure 8 is a schematic view of the relative position of the preformed template, parison, and mold with the auxiliary male mold;
  • Figure 9 is the state of the preformed template with the auxiliary male mold, the parison, and the mold closed;
  • Figure 10 is the pre-formed template The split-assisted male mold pushes the parison and pre-stretches the parison;
  • Figure 11 is a schematic view showing the forming of the high pressure blown parison and the two male molds being closed to the initial position
  • Fig. 12 is a schematic view showing the mold blank being opened, and the two parisons are attached to the mold after the pre-formed template with the auxiliary male mold is withdrawn;
  • 1 is two parisons
  • 2 is mold half mold
  • 3 is pre-formed template
  • 4 is auxiliary male mold
  • 5 is robot arm
  • 6 is assembly internal mechanism
  • 7 is base
  • 8 is fuel tank.
  • a two-piece blow molding hollow box molding method with an auxiliary male mold the molding method includes the following steps.
  • the component built-in mechanism 6 is moved in to perform the built-in component connection, see Fig. 4, the pre-formed template 3 with the auxiliary male mold 4 is exited from the position in the middle of the mold, and the connection between the built-in component and the preformed parison is performed, in this step, the robot
  • the arm 5 first moves the clamped component built-in mechanism 6 with built-in parts to the position where the parts need to be built in between the molds.
  • a built-in mechanism of the mechanical structure fixing component can be used to enhance the rigidity of the built-in mechanism of the component, prevent shaking during the built-in process of the component, improve the positional accuracy of the built-in component, and improve the built-in The quality of the connection.
  • the built-in parts generally include a valve tube assembly, an oil and gas separation device, a secondary pump sensor, a wave protection plate, a pipe clamp, and the like.
  • the robot arm has a pushing device such as a cylinder, a cylinder or a motor for connecting the built-in parts with the parison inside the mold cavity. This connection can be one of welding, welding or riveting.
  • the welding or welding process needs to be preceded by hot plate or infrared preheating to better achieve the connection performance; 7)
  • the component built-in mechanism 6 is removed; see Figure 5, 8)
  • the mold half mold 2 is closed after the second closure.
  • the mold opens and the product is removed.
  • the mechanism exits the middle position of the mold, and the final closing of the two molds is performed. After the closing, the high-pressure blow molding is performed again to realize the welding of the two upper and lower shells. , obtained a plastic fuel tank 8 with built-in parts.
  • the auxiliary male mold 4 is used to realize the auxiliary stretching of the parison stretching region, which compensates for the limitations of the two parison wall thickness control systems, and forms a plastic with a large drawing ratio and a uniform wall thickness distribution.
  • the fuel tank manufacturing method even if the structure of the fuel tank is complicated, the auxiliary wall of the auxiliary male mold can ensure that the wall thickness distribution of the fuel tank is better and more uniform, and the stretching ratio is larger, so that the shape of the fuel tank can be made larger. Design freedom to ensure better product quality.
  • the auxiliary male mold 4 on the pre-formed template in the step 3 is set as a split structure, and the specific steps are as follows, 31) the mold half mold 2 and the preform template 3
  • the actuator drives the auxiliary male mold 4 to move toward the inner wall of the mold cavity to realize pre-stretching of the parison
  • the actuator includes a cylinder, a cylinder or a motor-driven mechanism.
  • the actuator includes a cylinder, a cylinder or a motor-drive mechanism.
  • the actuator drives the auxiliary male mold to move toward the inner wall of the mold cavity, and the molten parison is pre-stretched under the promotion of the auxiliary male mold to realize pre-stretching of the parison; and the pre-tensioning of the parison is realized by the auxiliary male mold 4. Stretching, when the auxiliary male mold 4 moves toward the inner wall of the mold cavity, firstly, the auxiliary parison region is pre-stretched by the auxiliary male mold, and once the parison contacts the auxiliary male mold, the molten parison and the auxiliary male mold are good.
  • the auxiliary male mold 4 on the pre-formed template 3 in the step 3 is set as a split structure, and the specific steps are as follows, 31) the mold half mold 2 After the preforming template 3 is closed, the vacuum adsorbing the parison in the mold, while adsorbing, the actuator drives the auxiliary male mold 4 to move toward the inner wall of the mold cavity to realize pre-stretching of the parison; the actuator includes a cylinder, Cylinder or motor-drive mechanism.
  • the actuator drives the auxiliary male mold to move toward the inner wall of the mold cavity, and the molten parison is pre-stretched under the promotion of the auxiliary male mold 4 to realize pre-stretching of the parison; and the pre-preparation of the parison is realized by the auxiliary male mold 4.
  • the auxiliary parison region is first pre-stretched by the auxiliary male mold 4, and once the parison contacts the auxiliary male mold 4, due to the molten parison and the auxiliary
  • the good sliding and friction behavior of the male mold is pre-stretched, so that it can maintain a good wall thickness distribution, overcome the problem of the wall thickness of the conventional parison stretching, and the shape is more complicated and stretched.
  • a bigger fuel tank While the mold cavity is evacuated, the molten parison is pushed, and the parison is pre-stretched by the movement to the inner wall of the mold cavity.
  • Example 4 After the pre-stretching operation is completed, the parison inside the fuel tank is blow-molded by high-pressure gas, and the parison is attached to the inner surface of the mold cavity to obtain two shells attached to the inner side of the mold half mold. The remaining results and advantages are identical to those of Embodiment 1.
  • Example 4 Example 4:
  • the auxiliary male mold 4 on the pre-formed template 3 in the step 3 is set as a unitary structure, and the specific steps are as follows, 31) the process of closing the mold half mold 2 and the preformed template 3 Wherein, the mold half mold 2 extrudes the parison to the auxiliary male mold 4 in the pre-formed template 3, and after the parison contacts the auxiliary male mold 4, the parison is stretched, thereby realizing pre-stretching of the parison; After the mold half mold 2 and the preform template 3 are closed, the sheet parison is cut.
  • the auxiliary stretching process is completed after the preform mold half mold and the preform template are completely closed, and the auxiliary stretching is mainly caused by the mold half mold pressing the parison into the preform template.
  • the male mold once contacted with the auxiliary male mold, is pre-stretched due to the good sliding and frictional action of the molten parison and the auxiliary male mold, so that a good wall thickness distribution can be maintained, and the shape can be better formed.
  • the complex and high-grade fuel tank better meets the requirements of the minimum wall thickness at which the parison is stretched. The remaining results and advantages are identical to those of Embodiment 1.
  • the auxiliary male mold 4 on the pre-formed template 3 in the step 3 is provided as a unitary structure, which further includes the following steps, 33) after the material is cut, the vacuum in the mold Adsorption of parisons. Vacuum adsorption is to better ensure the uniformity of the wall thickness distribution, and it is better to shape the fuel tank with complex shape and high height to better meet the minimum wall thickness of the parison.
  • Example 6
  • the auxiliary male mold 4 on the pre-formed template in the step 3 is set as a split structure which is combined together, and the specific steps are as follows, 31) the mold half mold 2 and After the preforming template 3 is closed, the preform is vacuum-adsorbed in the mold, and the actuator is driven to move the auxiliary male mold toward the inner wall of the mold cavity to realize pre-stretching of the parison.
  • the auxiliary male mold 4 on the pre-formed template in the step 3 is set as a split type structure which is combined together, and the specific steps are as follows, 31) the mold half mold 2 and During the process of closing the preformed template 3, the mold half mold squeezes the parison into the auxiliary male mold in the preforming template, and after the parison contacts the auxiliary male mold, the parison is stretched, that is, the first time for the parison is achieved.
  • the auxiliary male mold on the preforming template is arranged as a combined split structure, and the actuator includes a cylinder, a cylinder or a motor-driven mechanism.
  • the actuator includes a cylinder, a cylinder or a motor-driven mechanism.
  • the internal high pressure blow molding in the step 4 after the preforming is completed, before the mold is opened, the following steps are further included, 41) the auxiliary male mold 4 is returned to the initial state by the actuator. position.
  • the technical solution is mainly for the auxiliary male mold to be set as a split structure. When the auxiliary male mold completes the stretching of the parison, it returns to the initial position, so as to continue the subsequent steps. The remaining results and advantages are identical to those of Embodiment 1.
  • the auxiliary male mold 4 is one or a combination of polytetrafluoroethylene and epoxy resin.
  • the auxiliary male mold generally does not cause a rapid decrease in the temperature of the parison when it is applied to push the parison, so the auxiliary male mold preferably uses a material having a lower thermal conductivity. Since the temperature of the molten parison in contact may generally require a high temperature of 190 degrees Celsius, the material should also have high temperature resistance properties, such as engineering materials such as polytetrafluoroethylene, epoxy resin, and wood materials, which can meet the material performance requirements of the mechanism. The remaining results and advantages are identical to those of Example 1.
  • the molding method further comprises a breaking step of the parison blank, which is disposed before the high pressure blow molding inside the step 4 or simultaneously with the high pressure blow molding, the mold half mold After the preforming template is closed, the sheet parison can be cut; the material is melted by an external cutting or a die and a core closing method. Breaking materials, providing preparation for continuous production.
  • the remaining results and advantages are identical to those of Embodiment 1. According to the present invention, at least one of the technical features described in Embodiments 2, 3, 4, 5, 6, 7, 8, 9, 10 can be combined with Embodiment 1 to form a new embodiment.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

本发明涉及一种带辅助阳模的两片吹塑中空箱体成型方法，其特征在于，所述成型方法包括以下步骤，1）两片型坯下料；2）模具半模与预成型模板闭合；3）预成型模板上的辅助阳模对熔融型坯预拉伸；4）内部高压吹塑，进行两片壳体预成型；模具打开，预成型模板退出；6）组件内置机构移入进行内置组件连接；7）组件内置机构移出；8）模具二次闭合后最终吹塑成型中空箱体；9）模具打开并取出产品。本发明在模具半模与预成型模板闭合预成型的过程中，利用辅助阳模，实现对型坯拉伸较大的区域辅助拉伸，成型出拉伸比大、壁厚分布均匀的塑料燃油箱制造方法，可使燃油箱的外形具有更大的设计自由度，确保更好的产品成型质量。

Description

一种带辅助阳模的两片吹塑中空箱体成型方法
技术领域
本发明涉及一种吹塑中空体的成型方法， 特别是一种带辅助阳模 的两片吹塑中空体的成型方法， 尤其适用于燃油箱吹塑制造的领域。 背景技术
带有 EV0H燃油阻隔层的 HDPE6层共挤吹塑技术是当今塑料燃油箱 制造的主流技术， 随着全球政府环境保护意识的增强， 相关的政策和 法规对汽车主机厂提出了严格的要求， 如美国加州出台了 PZEV即准 零排放法规要求。对于主流技术生产的塑料燃油箱来说， 其总蒸发排 放包括汽油在油箱本体、焊接面和装配件、密封件的蒸发排放等一般 在数百 mg/24h，所以 PZEV的排放标准对于塑料燃油箱来说非常苛刻。 同时由于主机厂对油箱内部由于燃油晃动造成的噪音在背景噪音的 要求的听听提高， 故需要在燃油箱内部携带大型的防浪板结构， 故需 要更大的工艺设计自由度。
为了实现这些目标，如专利 PCT/CN2012/081100涉及了一种在如何 能在降低设备和产品成本的同时， 提高产品质量和工装设计自由度， 减少中空箱体的蒸发排放量，以及可内置大型的组件例如防浪板内置 阀管等零件的方法。对于塑料燃油箱一般要求最小壁厚不得小于 3mm， 焊接面厚度不小于 3. 5mm, 且对于拉伸较大的区域较更难符合这样的 壁厚要求， 而出于产品单件成本的考虑又无法过高增加型坯的壁厚， 现有的两片型坯口模的壁厚控制方法无法对拉伸较大的局部区域进 行有效的壁厚调节使之符合最小壁厚的要求。为了进一歩提高产品的 质量， 基于两片吹塑成型出外形更加复杂， 局部高度突出的油箱， 提 高壁厚分布均匀性减少产品重量和单件成本是亟需解决的一个问题。 发明内容
本发明正是针对现有技术中存在的技术问题，提供一种结构简单、 操作方便、成本较低的带辅助阳模的两片吹塑中空箱体成型方法， 还 方法可以实现带大型内置组件的两片中空箱体吹塑成型方法，通过对 熔融塑料型坯进行部分预拉伸， 再用真空或气压进行成型， 可成型拉 伸比更大、壁厚分布更均匀， 可使燃油箱的外形具有更大的设计自由 度， 以及更好的产品成型质量。 为了实现上述目的， 本发明的技术方案如下， 一种带辅助阳模的 两片吹塑中空箱体成型方法， 其特征在于， 所述成型方法包括以下歩 骤，
1 ) 两片型坯下料，所述两片型坯下料后分别位于两片模具与预成 型模板之间的中间位置；
2) 模具半模与预成型模板闭合；
3) 预成型模板上的辅助阳模对熔融型坯预拉伸；
4) 内部高压吹塑， 进行两片壳体预成型；
5) 模具打开， 预成型模板退出；
6 ) 组件内置机构移入进行内置组件连接
7) 组件内置机构移出；
8) 模具二次闭合后最终吹塑成型中空箱体；
9) 模具打开并取出产品。 作为本发明的一种改进， 所述歩骤 3中预成型模板上的辅助阳模 设置为分体式结构， 其具体歩骤如下， 31 )模具半模与预成型模板闭 合后， 执行机构带动辅助阳模向模具型腔内壁方向移动， 实现对型坯 的预拉伸， 所述执行机构包括气缸、 油缸或者电动机构。
进一歩地， 作为本发明的一种改进， 所述歩骤 3中预成型模板上 的辅助阳模设置为分体式结构， 其具体歩骤如下， 31 )模具半模与预 成型模板闭合后， 模具内真空吸附型坯， 吸附的同时， 执行机构带动 辅助阳模向模具型腔内壁方向移动， 实现对型坯的预拉伸； 所述执行 机构包括气缸、油缸或者电动机构。执行机构带动辅助阳模向模具型 腔内壁方向移动， 熔融型坯在辅助阳模的推动下进行预拉伸， 实现对 型坯的预拉伸； 利用辅助阳模实现对型坯的预拉伸， 当辅助阳模向模 具型腔内壁的移动时，首先利用辅助阳模对需要的型坯区域进行预拉 伸， 型坯一旦接触辅助阳模， 由于熔融的型坯与辅助阳模良好的滑动 和摩擦行为的作用被预拉伸， 故能够保持较好的壁厚分布， 克服传统 的型坯拉伸较大处的壁厚不符的问题，成型出外形更复杂和拉伸比更 大的油箱。对模具型腔抽真空的同时， 推动熔融型坯， 向模具型腔内 壁的移动对型坯进行预拉伸。预拉伸动作完成后开始利用高压气体对 油箱内部的型坯进行吹塑成型， 使型坯贴至模具型腔的内表面， 获得 贴合在模具半模内侧的两片壳体。
作为本发明的一种改进，所述歩骤 3中预成型模板上的辅助阳模设 置为整体式结构， 其具体歩骤如下， 31 )模具半模与预成型模板闭合 的过程中， 模具半模将型坯挤向预成型模板中的辅助阳模， 型坯接触 到辅助阳模后， 型坯被拉伸， 即实现对型坯的预拉伸； 32)模具半模 与预成型模板闭合后， 对片体型坯进行断料。 进一歩地， 作为本发明的一种改进， 所述歩骤 3中预成型模板上 的辅助阳模设置为整体式结构， 其还包括以下歩骤， 33 )断料后， 模 具内真空吸附型坯。上述技术方案中， 在预成型的模具半模与预成型 模板完全闭合后即完成了辅助拉伸的过程，这种辅助拉伸主要是由于 模具半模将型坯挤向预成型模板中的辅助阳模，型坯一旦接触到辅助 阳模，由于熔融的型坯与辅助阳模良好的滑动和摩擦行为作用被预拉 伸， 故能够保持较好的壁厚分布， 能够更好地成型出形状复杂和高度 较高的油箱， 更好地满足型坯拉伸较大处最小壁厚的要求。
作为本发明的一种改进， 所述歩骤 3中预成型模板上的辅助阳模 设置为合并在一起的分体式结构， 其具体歩骤如下， 31 )模具半模与 预成型模板闭合后， 模具内真空吸附型坯， 吸附的同时， 执行机构带 动辅助阳模向模具型腔内壁方向移动， 实现对型坯的预拉伸。
进一歩地， 作为本发明的一种改进， 所述歩骤 3中预成型模板上 的辅助阳模设置为合并在一起的分体式结构， 其具体歩骤如下，
31 )模具半模与预成型模板闭合的过程中， 模具半模将型坯挤向预成 型模板中的辅助阳模， 型坯接触到辅助阳模后， 型坯被拉伸， 即实现 对型坯的第一次预拉伸；
32 )模具半模与预成型模板闭合后， 模具内真空吸附型坯， 吸附的同 时， 执行机构带动辅助阳模向模具型腔内壁方向移动， 实现对型坯的 第二次预拉伸。
上述技术方案中， 预成型模板上的辅助阳模设置为合并在一起的 分体式结构， 所述执行机构包括气缸、 油缸或者电动机构。在模具半 模与预成型模板闭合的过程中利用合并为一体的分体式辅助阳模对 熔融型坯进行辅助拉伸， 即已完成了第一次的辅助拉伸过程， 在模具 半模与预成型模板完全闭合时将分体式辅助阳模打开，推动型坯向模 具型腔内壁移动， 进行第二次辅助拉伸， 经过两次拉伸， 以获得更好 的辅助拉伸功能， 使得壁厚分布更加良好、 更加均匀， 更好地成型出 形状复杂和拉伸比更大的油箱。
作为本发明的一种改进， 所述歩骤 4中内部高压吹塑， 预成型完 成后， 模具打开之前， 还包括以下歩骤， 41 )辅助阳模在执行机构的 带动下， 回归至初始位置。该技术方案主要是针对辅助阳模设置为分 体式结构来说的，当辅助阳模完成了对型坯的拉伸后，回到初始位置， 以便于后续歩骤的继续进行。
作为本发明的一种改进， 所述辅助阳模采用聚四氟乙烯、 环氧树 脂中的一种或者几种组合。该辅助阳模在贴合并推动型坯时一般要求 不能导致型坯温度的迅速降低，故该辅助阳模优选地采用导热系数较 低的材料。 由于接触的熔融型坯温度一般可能要求 190 摄氏度的高 温， 故该材料还应具有耐高温的性能， 例如聚四氟乙烯、 环氧树脂、 木质材料等工程材料能够满足该机构的材料性能要求。
作为本发明的一种改进， 所述成型方法还包括片体型坯的断料歩 骤，所述断料歩骤设置在歩骤 4内部高压吹塑之前或者与高压吹塑同 时进行，模具半模与预成型模板闭合后，就可以对片体型坯进行断料； 所述断料通过外部切割或者口模与模芯闭合的方法实现熔融型坯的 断料， 为连续生产提供准备。 带辅助阳模的预成型模板退出模具中间的位置后进行内置组件 与预成型型坯的连接， 在该歩骤中， 机器人手臂首先将夹持的带内置 零件的组件内置机构移至模具之间需内置零件的位置。在组件内置的 过程， 由于需要较大的推力， 可以采用一种机械结构固定组件内置机 构起到增强组件内置机构刚度， 防止在组件内置的过程中的晃动， 提 高组件内置的位置精度， 提高内置连接的质量。 内置零件一般包括阀 管总成、 油气分离装置、 副泵传感器、 防浪板、 管卡支架等。 机器人 手臂上带有气缸、油缸或者电机等推动装置， 用于将内置的零件与模 具型腔内部的型坯进行连接， 这种连接可采用焊接、熔接或者铆接的 方式中的一种，当采用焊接或者熔接工艺的时需要在之前进行热板或 者红外预热， 以便于更好的实现连接性能。
利用机器人手臂组件内置机构实现内置件连接后，该机构退出模 具的中间位置， 并进行两片模具的最终闭合， 闭合后再次进行高压吹 塑成型， 实现两片上下壳体的熔接， 得到了带有内置零件的塑料燃油 箱。
相对于现有技术， 本发明的优点如下， 本发明提供了一种两片型 坯塑料中空体特别是塑料燃油箱吹塑成型的方法，并实现了大型内置 组件与油箱内壁的连接。在模具半模与预成型模板闭合预成型的过程 中， 利用辅助阳模， 实现对型坯拉伸较大的区域辅助拉伸， 弥补了两 片型坯壁厚控制系统局限性， 成型出拉伸比大、壁厚分布均匀的塑料 燃油箱制造方法，即使该油箱的结构复杂，通过辅助阳模的辅助拉伸， 也能确保油箱的壁厚分布更加良好、 更加均匀， 拉伸比更大， 可使燃 油箱的外形具有更大的设计自由度， 确保更好的产品成型质量。
附图说明
图 1为两片塑料型坯下料及设备工装示意图；
图 2为模具半模与预成型模板闭合和断料，高压吹进行壳体预成型示 意图；
图 3为模具打开， 预成型模板退出示意图；
图 4为组件内置机构移入进行内置组件连接示意图；
图 5 为完成内置零件与油箱壳体连接后组件内置机构移出示意图； 图 6为模具半模二次闭合示意图；
图 7为模具打开后取出的成型油箱结构示意图；
图 8 为带辅助阳模的预成型模板、 型坯、 模具的相对位置示意图； 图 9为带辅助阳模的预成型模板、 型坯、 模具闭合时的状态； 图 10 为预成型模板中的分体辅助阳模推动型坯并对型坯进行预拉伸 示意图；
图 11为高压吹型坯成型以及两片阳模合拢至初始位置示意图； 图 12为模具打开， 带辅助阳模的预成型模板退出后两片型坯与模具 贴合的示意图；
图中： 1为两片型坯， 2为模具半模， 3为预成型模板， 4为辅助阳模， 5为机器人手臂，6为组件内置机构， 7为底座， 8为油箱。
具体实施方式
为了加深对本发明的理解和认识，下面结合附图和具体实施方式 对本发明做出进一歩的说明和介绍。 实施例 1：
参见图 1一图 12，一种带辅助阳模的两片吹塑中空箱体成型方法， 所述成型方法包括以下歩骤，
1 ) 两片型坯 1下料， 所述两片型坯 1下料后分别位于两片模具半模 2与预成型模板 3之间的中间位置， 具体参见图 1，
2 ) 模具半模 2与预成型模板 3闭合； 参见图 2，
3 ) 预成型模板 3上的辅助阳模 4对熔融型坯预拉伸；
4) 内部高压吹塑， 进行两片壳体预成型；
5 ) 模具半模 2打开， 预成型模板 3退出； 参见图 3，
6)组件内置机构 6移入进行内置组件连接， 参见图 4， 带辅助阳模 4 的预成型模板 3 退出模具中间的位置后进行内置组件与预成型型坯 的连接， 在该歩骤中， 机器人手臂 5首先将夹持的带内置零件的组件 内置机构 6移至模具之间需内置零件的位置。在组件内置的过程， 由 于需要较大的推力，可以采用一种机械结构固定组件内置机构起到增 强组件内置机构刚度， 防止在组件内置的过程中的晃动， 提高组件内 置的位置精度， 提高内置连接的质量。 内置零件一般包括阀管总成、 油气分离装置、 副泵传感器、 防浪板、 管卡支架等。 机器人手臂上带 有气缸、油缸或者电机等推动装置， 用于将内置的零件与模具型腔内 部的型坯进行连接， 这种连接可采用焊接、熔接或者铆接的方式中的 一种，当采用焊接或者熔接工艺的时需要在之前进行热板或者红外预 热， 以便于更好的实现连接性能； 7) 组件内置机构 6移出； 参见图 5， 8) 模具半模 2二次闭合后最终吹塑成型中空箱体； 参见图 6， 9) 模具打开并取出产品。 参见图 7， 利用机器人手臂组件内置机构实现 内置件连接后， 该机构退出模具的中间位置， 并进行两片模具的最终 闭合， 闭合后再次进行高压吹塑成型， 实现两片上下壳体的熔接， 得 到了带有内置零件的塑料燃油箱 8。
该方案中，利用辅助阳模 4，实现对型坯拉伸较大的区域辅助拉伸， 弥补了两片型坯壁厚控制系统局限性， 成型出拉伸比大、壁厚分布均 匀的塑料燃油箱制造方法， 即使该油箱的结构复杂， 通过辅助阳模的 辅助拉伸， 也能确保油箱的壁厚分布更加良好、 更加均匀， 拉伸比更 大， 可使燃油箱的外形具有更大的设计自由度， 确保更好的产品成型 质量。
实施例 2：
参见图 10， 作为本发明的一种改进， 所述歩骤 3中预成型模板上 的辅助阳模 4设置为分体式结构， 其具体歩骤如下， 31 ) 模具半模 2 与预成型模板 3闭合后，执行机构带动辅助阳模 4向模具型腔内壁方 向移动， 实现对型坯的预拉伸， 所述执行机构包括气缸、 油缸或者电 动机构。所述执行机构包括气缸、 油缸或者电动机构。执行机构带动 辅助阳模向模具型腔内壁方向移动，熔融型坯在辅助阳模的推动下进 行预拉伸， 实现对型坯的预拉伸； 利用辅助阳模 4实现对型坯的预拉 伸， 当辅助阳模 4向模具型腔内壁的移动时， 首先利用辅助阳模对需 要的型坯区域进行预拉伸， 型坯一旦接触辅助阳模， 由于熔融的型坯 与辅助阳模良好的滑动和摩擦行为的作用被预拉伸，故能够保持较好 的壁厚分布， 克服传统的型坯拉伸较大处的壁厚不符的问题， 成型出 外形更复杂和拉伸比更大的油箱。对模具型腔抽真空的同时， 推动熔 融型坯， 向模具型腔内壁的移动对型坯进行预拉伸。预拉伸动作完成 后开始利用高压气体对油箱内部的型坯进行吹塑成型，使型坯贴至模 具型腔的内表面， 获得贴合在模具半模内侧的两片壳体。其余结果和 优点与实施例 1完全相同。
实施例 3：
参见图 10， 进一歩地， 作为本发明的一种改进， 所述歩骤 3中预 成型模板 3上的辅助阳模 4设置为分体式结构，其具体歩骤如下， 31 ) 模具半模 2与预成型模板 3闭合后， 模具内真空吸附型坯， 吸附的同 时， 执行机构带动辅助阳模 4向模具型腔内壁方向移动， 实现对型坯 的预拉伸； 所述执行机构包括气缸、 油缸或者电动机构。执行机构带 动辅助阳模向模具型腔内壁方向移动，熔融型坯在辅助阳模 4的推动 下进行预拉伸， 实现对型坯的预拉伸； 利用辅助阳模 4实现对型坯的 预拉伸， 当辅助阳模 4向模具型腔内壁的移动时， 首先利用辅助阳模 4对需要的型坯区域进行预拉伸， 型坯一旦接触辅助阳模 4， 由于熔 融的型坯与辅助阳模良好的滑动和摩擦行为的作用被预拉伸，故能够 保持较好的壁厚分布， 克服传统的型坯拉伸较大处的壁厚不符的问 题， 成型出外形更复杂和拉伸比更大的油箱。对模具型腔抽真空的同 时， 推动熔融型坯， 向模具型腔内壁的移动对型坯进行预拉伸。预拉 伸动作完成后开始利用高压气体对油箱内部的型坯进行吹塑成型，使 型坯贴至模具型腔的内表面， 获得贴合在模具半模内侧的两片壳体。 其余结果和优点与实施例 1完全相同。 实施例 4：
作为本发明的一种改进， 所述歩骤 3中预成型模板 3上的辅助阳 模 4设置为整体式结构， 其具体歩骤如下， 31 )模具半模 2与预成型 模板 3闭合的过程中，模具半模 2将型坯挤向预成型模板 3中的辅助 阳模 4， 型坯接触到辅助阳模 4后， 型坯被拉伸， 即实现对型坯的预 拉伸； 32 )模具半模 2与预成型模板 3闭合后，对片体型坯进行断料。 该技术方案中，在预成型的模具半模与预成型模板完全闭合后即完成 了辅助拉伸的过程，这种辅助拉伸主要是由于模具半模将型坯挤向预 成型模板中的辅助阳模， 型坯一旦接触到辅助阳模， 由于熔融的型坯 与辅助阳模良好的滑动和摩擦行为作用被预拉伸，故能够保持较好的 壁厚分布， 能够更好地成型出形状复杂和高度较高的油箱， 更好地满 足型坯拉伸较大处最小壁厚的要求。其余结果和优点与实施例 1完全 相同。
实施例 5：
进一歩地， 作为本发明的一种改进， 所述歩骤 3 中预成型模板 3 上的辅助阳模 4设置为整体式结构，其还包括以下歩骤， 33 )断料后， 模具内真空吸附型坯。 真空吸附是为了更好的保证壁厚分布的均匀 性， 能够更好地成型出形状复杂和高度较高的油箱， 更好地满足型坯 拉伸较大处最小壁厚的要求。 其余结果和优点与实施例 1完全相同。 实施例 6：
作为本发明的一种改进，所述歩骤 3中预成型模板上的辅助阳模 4设 置为合并在一起的分体式结构， 其具体歩骤如下， 31 )模具半模 2与 预成型模板 3闭合后， 模具内真空吸附型坯， 吸附的同时， 执行机构 带动辅助阳模向模具型腔内壁方向移动， 实现对型坯的预拉伸。
该过程中在模具半模与预成型模板完全闭合时将分体式辅助阳模打 开， 推动型坯向模具型腔内壁移动， 进行一次辅助拉伸， 以获得更好 的辅助拉伸功能， 使得壁厚分布更加良好、 更加均匀， 更好地成型出 形状复杂和拉伸比更大的油箱。 其余结果和优点与实施例 1 完全相 同。
实施例 7：
进一歩地， 作为本发明的一种改进， 所述歩骤 3中预成型模板上 的辅助阳模 4设置为合并在一起的分体式结构，其具体歩骤如下， 31 ) 模具半模 2与预成型模板 3闭合的过程中，模具半模将型坯挤向预成 型模板中的辅助阳模， 型坯接触到辅助阳模后， 型坯被拉伸， 即实现 对型坯的第一次预拉伸； 32 )模具半模 2与预成型模板 3闭合后， 模 具内真空吸附型坯， 吸附的同时， 执行机构带动辅助阳模向模具型腔 内壁方向移动， 实现对型坯的第二次预拉伸。
上述技术方案中， 预成型模板上的辅助阳模设置为合并在一起的 分体式结构， 所述执行机构包括气缸、 油缸或者电动机构。在模具半 模与预成型模板闭合的过程中利用合并为一体的分体式辅助阳模对 熔融型坯进行辅助拉伸， 即已完成了第一次的辅助拉伸过程， 在模具 半模与预成型模板完全闭合时将分体式辅助阳模打开，推动型坯向模 具型腔内壁移动， 进行第二次辅助拉伸， 经过两次拉伸， 以获得更好 的辅助拉伸功能， 使得壁厚分布更加良好、 更加均匀， 更好地成型出 形状复杂和拉伸比更大的油箱。 其余结果和优点与实施例 1 完全相 同。
实施例 8：
作为本发明的一种改进， 所述歩骤 4中内部高压吹塑， 预成型完 成后， 模具打开之前， 还包括以下歩骤， 41 )辅助阳模 4在执行机构 的带动下， 回归至初始位置。该技术方案主要是针对辅助阳模设置为 分体式结构来说的， 当辅助阳模完成了对型坯的拉伸后， 回到初始位 置， 以便于后续歩骤的继续进行。其余结果和优点与实施例 1完全相 同。
实施例 9：
作为本发明的一种改进， 所述辅助阳模 4采用聚四氟乙烯、 环氧 树脂中的一种或者几种组合。该辅助阳模在贴合并推动型坯时一般要 求不能导致型坯温度的迅速降低，故该辅助阳模优选地采用导热系数 较低的材料。由于接触的熔融型坯温度一般可能要求 190摄氏度的高 温， 故该材料还应具有耐高温的性能， 例如聚四氟乙烯、 环氧树脂、 木质材料等工程材料能够满足该机构的材料性能要求。其余结果和优 点与实施例 1完全相同。
实施例 10：
作为本发明的一种改进， 所述成型方法还包括片体型坯的断料歩 骤，所述断料歩骤设置在歩骤 4内部高压吹塑之前或者与高压吹塑同 时进行，模具半模与预成型模板闭合后，就可以对片体型坯进行断料； 所述断料通过外部切割或者口模与模芯闭合的方法实现熔融型坯的 断料， 为连续生产提供准备。 其余结果和优点与实施例 1完全相同。 根据需要， 本发明还可以将实施例 2、 3、 4、 5、 6、 7、 8、 9、 10 所述技术特征中的至少一个与实施例 1组合， 形成新的实施方式。 需要说明的是上述实施例仅仅是本发明的较佳实施例，并没有用来限 定本发明的保护范围，在上述基础上所作出的等同替换或者替代均属 于本发明的保护范围， 本发明的保护范围以权利要求书为准。

Claims

权 利 要 求
1、 一种带辅助阳模的两片吹塑中空箱体成型方法， 其特征在于， 所 述成型方法包括以下歩骤，
1 ) 两片型坯下料，所述两片型坯下料后分别位于两片模具与预成 型模板之间的中间位置；
2) 模具半模与预成型模板闭合；
3 ) 预成型模板上的辅助阳模对熔融型坯预拉伸；
4) 内部高压吹塑， 进行两片壳体预成型；
5) 模具打开， 预成型模板退出；
6 ) 组件内置机构移入进行内置组件连接；
7) 组件内置机构移出；
8) 模具二次闭合后最终吹塑成型中空箱体；
9) 模具打开并取出产品。
2、根据权利要求 1所述的带辅助阳模的两片吹塑中空箱体成型方法， 其特征在于，所述歩骤 3中预成型模板上的辅助阳模设置为分体式结 构， 其具体歩骤如下， 31 )模具半模与预成型模板闭合后， 执行机构 带动辅助阳模向模具型腔内壁方向移动， 实现对型坯的预拉伸。
3、根据权利要求 1所述的带辅助阳模的两片吹塑中空箱体成型方法， 其特征在于，所述歩骤 3中预成型模板上的辅助阳模设置为分体式结 构， 其具体歩骤如下， 31 )模具半模与预成型模板闭合后， 模具内真 空吸附型坯， 吸附的同时， 执行机构带动辅助阳模向模具型腔内壁方 向移动， 实现对型坯的预拉伸。
4、根据权利要求 1所述的带辅助阳模的两片吹塑中空箱体成型方法， 其特征在于，所述歩骤 3中预成型模板上的辅助阳模设置为整体式结 构， 其具体歩骤如下，
31 )模具半模与预成型模板闭合的过程中， 模具半模将型坯挤向预成 型模板中的辅助阳模， 型坯接触到辅助阳模后， 型坯被拉伸， 即实现 对型坯的预拉伸；
32 ) 模具半模与预成型模板闭合后， 对片体型坯进行断料。
5、根据权利要求 4所述的带辅助阳模的两片吹塑中空箱体成型方法， 其特征在于，所述歩骤 3中预成型模板上的辅助阳模设置为整体式结 构， 其还包括以下歩骤， 33 ) 断料后， 模具内真空吸附型坯。
6、根据权利要求 1所述的带辅助阳模的两片吹塑中空箱体成型方法， 其特征在于，所述歩骤 3中预成型模板上的辅助阳模设置为合并在一 起的分体式结构， 其具体歩骤如下，
31 )模具半模与预成型模板闭合后， 模具内真空吸附型坯， 吸附的同 时， 执行机构带动辅助阳模向模具型腔内壁方向移动， 实现对型坯的 预拉伸。
7、根据权利要求 1所述的带辅助阳模的两片吹塑中空箱体成型方法， 其特征在于，所述歩骤 3中预成型模板上的辅助阳模设置为合并在一 起的分体式结构， 其具体歩骤如下，
31 )模具半模与预成型模板闭合的过程中， 模具半模将型坯挤向预成 型模板中的辅助阳模， 型坯接触到辅助阳模后， 型坯被拉伸， 即实现 对型坯的第一次预拉伸； 32 )模具半模与预成型模板闭合后， 模具内真空吸附型坯， 吸附的同 时， 执行机构带动辅助阳模向模具型腔内壁方向移动， 实现对型坯的 第二次预拉伸。
8、 根据权利要求 2或 3或 6或 7所述的带辅助阳模的两片吹塑中空 箱体成型方法， 其特征在于， 所述歩骤 4中内部高压吹塑， 预成型完 成后， 模具打开之前， 还包括以下歩骤， 41 )辅助阳模在执行机构的 带动下， 回归至初始位置。
9、根据权利要求 1一 8任一项权利要求所述的带辅助阳模的两片吹塑 中空箱体成型方法， 其特征在于， 所述辅助阳模采用聚四氟乙烯、 环 氧树脂或者木质材料中的一种或者几种组合。
10、 根据权利要求 1一 8任一项权利要求所述的带辅助阳模的两片吹 塑中空箱体成型方法， 其特征在于， 所述成型方法还包括片体型坯的 断料歩骤，所述断料歩骤设置在歩骤 4内部高压吹塑之前或者与高压 吹塑同时进行。
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