CN110126173B - Injection mold for large-thickness PE flange and forming method of PE flange - Google Patents

Injection mold for large-thickness PE flange and forming method of PE flange Download PDF

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Publication number
CN110126173B
CN110126173B CN201910456144.0A CN201910456144A CN110126173B CN 110126173 B CN110126173 B CN 110126173B CN 201910456144 A CN201910456144 A CN 201910456144A CN 110126173 B CN110126173 B CN 110126173B
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China
Prior art keywords
die
mold
flange
cavity
movable
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CN201910456144.0A
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Chinese (zh)
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CN110126173A (en
Inventor
童增耀
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Ningbo Lianda Plastic Pipe Co Ltd
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Ningbo Lianda Plastic Pipe Co Ltd
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Priority to CN201910456144.0A priority Critical patent/CN110126173B/en
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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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2602—Mould construction elements
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature

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

Abstract

The invention discloses an injection mold for a large-thickness PE flange, which comprises a movable mold, a fixed mold and a mold core, wherein a groove is formed in the movable mold, and a guide ring matched with the groove is arranged on the fixed mold; the invention also provides a forming method of the PE flange, which increases a secondary mold locking process after pressure maintaining and reduces the volume of the mold cavity, thereby reducing vacuum air holes formed by shrinkage of the inner plastic due to insufficient plastic in the mold cavity, cooling and solidification of the outer plastic and cooling of the inner plastic during pressure maintaining and cooling.

Description

Injection mold for large-thickness PE flange and forming method of PE flange
Technical Field
The invention relates to the technical field of molds, in particular to an injection mold for a large-thickness PE flange and a forming method of the PE flange.
Background
The PE flange is used as a part of a PE pipeline system, and has corrosion resistance, long service life and excellent physical properties; the toughness and the flexibility are good; the connection is convenient, the construction is simple, the electric melting connection and the hot melting butt joint can be realized, the flange loose joint can be used, the steel-plastic conversion can be realized, and the like. Referring specifically to fig. 1, a conventional PE flange is shown in fig. 1, which includes a flange portion 1 and a pipe body portion 2 connected to the flange portion.
But because its wall thickness is inhomogeneous, form the gas pocket in the position of the anchor ring neck easily during injection moulding, seriously influence the use quality, this problem urgently needs to be solved, this patent is a mould scheme that provides for solving this problem.
Disclosure of Invention
The invention aims to provide an injection mold for a large-thickness PE flange, which aims to solve the technical problem that the PE flange formed by the mold is easy to form air holes in the prior art, and the aim is achieved by the following technical scheme: a large-thickness PE flange injection mold comprises a movable mold, a fixed mold and a mold core, wherein a groove is formed in the movable mold, a guide ring matched with the groove is arranged on the fixed mold, the guide ring is positioned in the groove and can move along the groove, the movable mold and the fixed mold are provided with a first mold locking position and a second mold locking position, a gap is formed between the guide ring and the bottom of the groove when the first mold locking position is adopted, and a product cavity is formed among the movable mold, the fixed mold and the mold core; in a second mode-locking position, the guide ring abuts the groove bottom, such that the cavity volume is compressed.
In the above technical solution, the movable mold includes a stripper plate provided on an end surface thereof.
In the technical scheme, the flange part in the die cavity corresponding to the PE flange part is positioned on the same side as the guide ring.
The invention also provides a forming method of the PE flange, which solves the technical problem that the large-thickness PE is easy to generate air holes, and is realized by the following technical scheme: a forming method of a PE flange comprises the following steps:
step 1) carrying out first die assembly, and carrying out die assembly on a fixed die and a movable die through a die locking mechanism, wherein a gap exists between the fixed die and the movable die, and the size d1 of the gap is larger than or equal to the length H of a die cavity, the thermal expansion coefficient B of PE (molding temperature C1-demolding temperature C2)/100000);
step 2), filling a mold cavity, and injecting a plastic raw material into the mold cavity of the mold after mold closing at a certain injection speed until the mold cavity is filled;
step 3) maintaining pressure, wherein the pressure is maintained after the step 2 is finished, and the pressure maintaining time is 60-150 seconds;
step 4) secondary mode locking, further closing the movable mold and the fixed mold until the gap between the fixed mold and the movable mold in the step 1 is eliminated, and compressing the volume of the cavity;
and 5) cooling, opening the die and demolding to obtain the PE flange product.
In the technical scheme, the power for pushing the movable die in the step 4 is provided by the oil cylinder.
In the technical scheme, in the step 4, the movable mold and the fixed mold are closed at a speed greater than d 1/cooling time t.
In the technical scheme, the injection speed in the step 2 is 20mm/s to 30mm/s, and the injection pressure is 75MPa to 88 MPa.
In the above technical solution, in the process of compressing the volume of the cavity in step 4, the flange part of the PE flange is compressed first.
The invention has the following beneficial effects: the invention provides an injection mold for a large-thickness PE flange and a forming method of the PE flange, which can increase a secondary mold locking process after pressure maintaining and reduce the volume of a mold cavity, thereby reducing vacuum air holes formed by shrinkage of inner plastic due to insufficient plastic in the mold cavity, cooling and solidification of outer ring plastic and pressure maintaining cooling.
Drawings
Fig. 1 is a schematic structural view of a PE flange.
Fig. 2 is a schematic view of an injection mold according to the present application.
FIG. 3 is a schematic view of the engagement of the movable mold and the mold core.
FIG. 4 is a schematic structural diagram of a stationary mold.
Fig. 5 is a schematic structural view when the mold is closed.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 2 to 5, the injection mold for the large-thickness PE flange comprises a movable mold 1, a fixed mold 2 and a mold core 3, wherein a groove 10 is formed in the movable mold 1, a guide ring 20 matched with the groove 10 is arranged on the fixed mold 2, the guide ring 20 is positioned in the groove 10 and can move along the groove 10, and the movable mold 1 and the fixed mold 2 have a first mold locking position and a second mold locking position.
Referring to fig. 2, in the first mold clamping position, a gap d1 is formed between the guide ring 20 and the bottom of the groove 10, and a cavity 100 for a product is formed among the movable mold 1, the fixed mold 2 and the mold core 3; in the second mold-locking position, the guide ring 20 abuts against the bottom of the groove 10, so that the cavity 100 is compressed in volume.
Above-mentioned structure for the injection mold of this application can increase secondary mode locking process after the pressurize, reduces the die cavity volume, thereby because of plastics is not enough in the die cavity when reducing the pressurize cooling, outer lane plastics cooling solidification, and inside plastics produce the vacuum gas pocket that the shrink formed.
Preferably, the movable die includes a stripper plate provided on an end surface thereof. The flange part in the corresponding PE flange part in the cavity is positioned on the same side as the guide ring, and the flange part in the PE flange part is arranged on the same side as the guide ring, so that when a product is molded, the volume of the cavity 100 is compressed, the flange part of the PE flange part is compressed firstly, and the overall quality of the PE flange part is improved.
A forming method of a PE flange is characterized by comprising the following steps:
step 1) carrying out first die assembly, and carrying out die assembly on a fixed die and a movable die through a die locking mechanism, wherein a gap exists between the fixed die and the movable die, and the size d1 of the gap is larger than or equal to the length H of a die cavity, the thermal expansion coefficient B of PE (molding temperature C1-demolding temperature C2)/100000);
step 2), filling a mold cavity, and injecting a plastic raw material into the mold cavity of the mold after mold closing at a certain injection speed until the mold cavity is filled;
step 3) maintaining pressure, wherein the pressure is maintained after the step 2 is finished, and the pressure maintaining time is 60-150 seconds;
step 4) secondary mode locking, further closing the movable mold and the fixed mold until the gap between the fixed mold and the movable mold in the step 1 is eliminated, and compressing the volume of the cavity;
and 5) cooling, opening the die and demolding to obtain the PE flange product.
Wherein, the power for pushing the movable mould in the step 4 is provided by the oil cylinder. And in the step 4, closing the movable mold and the fixed mold at a speed of more than d 1/cooling time t, wherein the injection speed in the step 2 is 20mm/s to 30mm/s, and the injection pressure is 75MPa to 88 MPa.
In the process that the volume of the cavity is compressed in the step 4, the flange part of the PE flange part is firstly compressed. And then make the die cavity 100 volume compressed in-process when the product shaping, the flange part of PE flange spare is compressed at first, is favorable to the improvement of PE flange spare overall quality.
The forming method of the invention can increase the secondary mode locking process after pressure maintaining and reduce the volume of the die cavity, thereby reducing the vacuum air holes formed by the shrinkage of the inner plastic due to the cooling solidification of the outer plastic and the insufficient plastic in the die cavity when the pressure maintaining is cooled.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be appreciated by persons skilled in the art that the present invention is not limited by the embodiments described above. The foregoing embodiments and description of the invention have been provided for the purposes of illustrating the principles of the invention and is subject to various changes and modifications without departing from the spirit and scope of the invention. Such variations and modifications are intended to be within the scope of the claimed invention.

Claims (6)

1. The utility model provides a be used for heavy gauge PE flange injection mold, includes movable mould, cover half and mold core, its characterized in that:
a groove is formed in a movable die, a guide ring matched with the groove is arranged on a fixed die, the guide ring is positioned in the groove and can move along the groove, the movable die and the fixed die have a first die locking position and a second die locking position, a gap is formed between the guide ring and the bottom of the groove when the movable die and the fixed die are in the first die locking position, the size d1 of the gap is larger than or equal to the length H of a die cavity and the thermal expansion coefficient B of PE (forming temperature C1-die stripping temperature C2)/100000), and a die cavity of a product is formed among the movable die, the fixed die and a die core; in the second mold locking position, the guide ring abuts against the bottom of the groove, so that the volume of the cavity is compressed, and the flange part of the PE flange in the cavity corresponding to the PE flange is positioned on the same side as the guide ring, so that the flange part of the PE flange is compressed firstly in the process of compressing the volume of the cavity during product molding.
2. An injection mold for a large-thickness PE flange according to claim 1, characterized in that: the movable die includes a stripper plate disposed on an end face thereof.
3. A method for molding a PE flange, which uses the injection mold for a large-thickness PE flange as claimed in claim 1, and comprises the steps of:
step 1) carrying out first die assembly, and carrying out die assembly on a fixed die and a movable die through a die locking mechanism, wherein a gap exists between the fixed die and the movable die, and the size d1 of the gap is larger than or equal to the length H of a die cavity, the thermal expansion coefficient B of PE (molding temperature C1-demolding temperature C2)/100000);
step 2), filling a mold cavity, and injecting a plastic raw material into the mold cavity of the mold after mold closing at a certain injection speed until the mold cavity is filled;
step 3) maintaining pressure, wherein the pressure is maintained after the step 2 is finished, and the pressure maintaining time is 60-150 seconds;
step 4) secondary mode locking, further closing the movable die and the fixed die until the gap between the fixed die and the movable die in the step 1 is eliminated, compressing the volume of the cavity, and compressing the flange part of the PE flange firstly in the process of compressing the volume of the cavity;
and 5) cooling, opening the die and demolding to obtain the PE flange product.
4. A method of forming a PE flange according to claim 3, wherein: and 4, the power for pushing the movable mould in the step 4 is provided by the oil cylinder.
5. A method of forming a PE flange according to claim 3, wherein: and in the step 4, closing the movable mold and the fixed mold at a speed greater than d 1/cooling time t.
6. A method of forming a PE flange according to claim 3, wherein: in the step 2, the injection speed is 20mm/s to 30mm/s, and the injection pressure is 75MPa to 88 MPa.
CN201910456144.0A 2019-05-29 2019-05-29 Injection mold for large-thickness PE flange and forming method of PE flange Active CN110126173B (en)

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CN201910456144.0A CN110126173B (en) 2019-05-29 2019-05-29 Injection mold for large-thickness PE flange and forming method of PE flange

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CN110126173B true CN110126173B (en) 2021-07-13

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CN113414965B (en) * 2021-05-29 2024-03-15 江西爱贝斯特材料科技有限公司 Blowing mould capable of effectively improving mould closing line strength

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CN1143008A (en) * 1995-08-11 1997-02-19 董永成 Press mould jet forming method for thermal plastic material
JPWO2011077934A1 (en) * 2009-12-25 2013-05-02 コニカミノルタアドバンストレイヤー株式会社 Mold and mold manufacturing method
CN202480307U (en) * 2012-03-20 2012-10-10 济南泰星精细化工有限公司 Device for manufacturing plastic flanges
CN103286922B (en) * 2013-06-14 2015-06-03 东莞市奕东电子有限公司 Injection molding die of backlight guide plate and injection molding method
CN203567018U (en) * 2013-09-13 2014-04-30 衡阳财经工业职业技术学院 Injection mold for automobile motor flange plate
CN104669523A (en) * 2013-12-02 2015-06-03 苏州市吴中区临湖俊峰机械厂 Buoyancy gauge flange mounting cylinder molding plastic rubber mold for experiment
CN205364440U (en) * 2016-03-08 2016-07-06 五邑大学 Different chamber of LED shot -light aspherical lens injection compression heat runner mould
TWI631070B (en) * 2017-01-06 2018-08-01 國立台灣科技大學 Method of producing optical element having micro-structure
CN107443687A (en) * 2017-09-04 2017-12-08 遵义群建塑胶制品有限公司 A kind of air-conditioning moulding injection mold and injection moulding process with contraction distortion control
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CN209955201U (en) * 2019-05-29 2020-01-17 宁波联大塑料管件有限公司 Injection mold for large-thickness PE flange

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