CN117301440B - Pneumatic demoulding deep cavity injection molding die and demoulding method - Google Patents

Pneumatic demoulding deep cavity injection molding die and demoulding method Download PDF

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Publication number
CN117301440B
CN117301440B CN202311636747.1A CN202311636747A CN117301440B CN 117301440 B CN117301440 B CN 117301440B CN 202311636747 A CN202311636747 A CN 202311636747A CN 117301440 B CN117301440 B CN 117301440B
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China
Prior art keywords
die
fixed
mold
mounting hole
base
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CN117301440A (en
Inventor
柯真伟
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Chengdu Han De Sheng Bang Optical Co ltd
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Chengdu Han De Sheng Bang Optical Co ltd
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Priority to CN202311636747.1A priority Critical patent/CN117301440B/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
    • B29C45/17—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
    • B29C45/26—Moulds
    • B29C45/2602—Mould construction elements
    • B29C45/2606—Guiding or centering 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
    • 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
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/43—Removing or ejecting moulded articles using fluid under pressure
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7312—Construction of heating or cooling fluid flow channels
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7312—Construction of heating or cooling fluid flow channels
    • B29C2045/7318—Construction of heating or cooling fluid flow channels multilayered fluid channel constructions

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention relates to the field of injection molds, in particular to a pneumatic demolding deep cavity injection molding mold and a demolding method, wherein the pneumatic demolding deep cavity injection molding mold comprises a fixed mold, a movable mold, a processing mold and a flow guide assembly which are arranged up and down in a relative manner; the movable mould is provided with a first mounting hole; the processing model is arranged on the fixed die, an injection cavity is formed between the processing model and the movable die, and the processing model comprises two parts which are narrow in upper part and wide in lower part and can be split; the guide assembly is movably mounted in the first mounting hole, one end of the guide assembly is fixedly connected to the fixed die, when the movable die is separated from the fixed die, the space between the first mounting hole and the guide assembly is compressed, when the movable die and the fixed die reach a set first distance, air flow in the first mounting hole is guided to the processing model, and the top of the processing model is pushed to move upwards by the air flow to set a second distance. In the process, only when the movable die and the fixed die reach a set first distance, the air flow can prop against the top of the movable processing die, so that the formed workpiece is ejected out and collides with the movable die when the movable die is just separated from the fixed die.

Description

Pneumatic demoulding deep cavity injection molding die and demoulding method
Technical Field
The invention relates to the field of injection molds, in particular to a pneumatic demolding deep cavity injection molding mold and a demolding method.
Background
The injection mold is a tool for endowing a plastic product with a complete structure and an accurate size, injection molding is performed through the injection mold, which is a processing method used when some parts with complex shapes are produced in batches, heated and melted plastic is injected into a mold cavity by an injection molding machine under high pressure during processing, a formed product is obtained after cooling and solidification, a formed workpiece can stay in the inside of a fixed mold, and the formed mold is required to be demolded through a demolding mechanism.
The existing injection mold usually adopts a pushing or vibrating mode to separate a formed workpiece from a mold cavity when demolding is carried out, so that the formed workpiece is conveniently taken out, but in the forming process of certain special workpieces, the depth of the mold cavity is deeper, so that if the demolding is carried out by adopting the pushing or vibrating mode, on one hand, a larger pushing distance is needed, and on the other hand, the formed workpiece is possibly damaged.
Disclosure of Invention
Based on the above, it is necessary to provide a deep cavity injection molding mold and a demolding method for pneumatic demolding, which utilize the driving force of a movable mold, and compared with the traditional mold adopting a push rod to eject a molded workpiece, the top and the bottom of a processing mold adopted by the mold can be separated and eject the molded workpiece, the ejection surface is relatively large, the damage of the molded workpiece is not easy to cause, and the molded workpiece is easier to separate from the injection molding cavity. In the process, only when the movable die and the fixed die reach a set first distance, the air flow can prop against the top of the movable processing die, so that the formed workpiece is ejected out and collides with the movable die when the movable die is just separated from the fixed die, and the use is safer.
The invention provides a pneumatic demoulding deep cavity injection molding die, which comprises:
a fixed die and a movable die which are arranged up and down oppositely, wherein a first mounting hole is formed in the movable die;
the processing model is arranged on the fixed die and forms an injection cavity with the movable die, and comprises two parts which are narrow at the upper part and wide at the lower part and can be split;
the guide assembly is movably mounted in the first mounting hole, one end of the guide assembly is fixedly connected to the fixed die, when the movable die is separated from the fixed die, the space between the first mounting hole and the guide assembly is compressed, when the movable die and the fixed die reach a set first distance, air flow in the first mounting hole is guided to the processing model, and the top of the processing model is pushed to move upwards by the air flow to set a second distance.
In one embodiment, a first mounting hole is formed in the corner of the upper surface of the fixed die and used for mounting the flow guide assembly, a mounting cavity is formed in the middle of the upper surface of the fixed die and used for mounting the processing model, and a boss is arranged at the edge of the upper surface of the fixed die; the middle part of the lower surface of the movable die is provided with an injection cavity for accommodating the processing model, the corner of the lower surface of the movable die is provided with a second mounting hole coaxial with the first mounting hole and used for mounting the flow guide assembly, and the edge of the lower surface of the movable die is provided with a groove matched with the boss.
In one embodiment, the bottom end of the fixed die is provided with a die mounting seat, the die mounting seat comprises a base and a first positioning tube, an air inlet channel coaxial with the first mounting hole and an air outlet channel opposite to the top of the processing model are formed in the base, the air inlet channel is communicated with the air outlet channel, the first positioning tube is arranged on the upper surface of the base, and the air outlet channel is located in the range of the inner ring of the first positioning tube.
In one embodiment, the processing model comprises a mounting plate, a model base, a model top cover and a second positioning pipe, wherein the mounting plate is detachably arranged in the mounting cavity, the model base is fixed on the mounting plate, the model top cover is detachably arranged on the model base, the joint of the model top cover and the model base is sealed, the second positioning pipe is arranged on the ground in the model top cover, and the second positioning pipe is movably inserted in the first positioning pipe.
In one embodiment, the air outlet channel is provided with an air guide piece at the communication position of the first positioning tube, when the air guide piece detects that the air pressure is smaller than a set threshold value, the air guide piece is kept closed, the air outlet channel is isolated from the interior of the first positioning tube, when the air guide piece detects that the air pressure reaches the set threshold value, the air guide piece is opened, and the air outlet channel is communicated with the interior of the first positioning tube.
In one embodiment, the flow guiding assembly comprises a fixed pipe and a positioning block, one end of the fixed pipe is fixed on the base, the inside of the fixed pipe is communicated with the air inlet channel, the fixed pipe is positioned in the first mounting hole and the second mounting hole, the positioning block is movably clamped in the second mounting hole and is connected with the end part of the fixed pipe, an air hole is formed in the fixed pipe, a closed space is formed between the fixed pipe, the positioning block and the second mounting hole, when the movable mold is far away from the fixed mold, the closed space is compressed, and air flow in the closed space flows into the fixed pipe through the air hole.
In one embodiment, a cooling assembly is arranged between the processing model and the first positioning pipe, a plurality of cooling water channels are formed in the base, one ends of the cooling water channels penetrate through the upper surface of the base, the other ends of the cooling water channels penetrate through the side surface of the base, one ends of the cooling assembly are fixed on the base and communicated with the cooling water channels, the other ends of the cooling assembly extend upwards to be close to the top cover of the model and then bend downwards to be communicated with the other cooling water channels, the cooling assembly is provided with a plurality of cooling assemblies, and the cooling assembly is arranged in an annular array around the central axis of the first positioning pipe.
In one embodiment, two adjacent cooling water channels are connected through a third connecting pipe at one end penetrating through the side face of the base, so that after cooling water is injected into one cooling water channel, the cooling water can sequentially pass through a plurality of cooling assemblies and flow out from the other cooling water channel.
In one embodiment, the cooling assembly comprises two first connecting pipes and a second connecting pipe, the distances between the two first connecting pipes and the inner surface of the processing model are the same, the second connecting pipe is in an arc-shaped arrangement and is the same as the distances between the two inner surfaces of the processing model, and two ends of the second connecting pipe are respectively communicated with the two first connecting pipes.
The invention also provides a demoulding method of the pneumatic demoulding deep cavity injection moulding mould, which comprises the following steps:
when the movable die is separated from the fixed die, the space between the first mounting hole and the flow guide assembly is compressed;
when the moving die and the fixed die reach a set first distance, air flow in the first mounting hole is guided to the processing model, and the top of the processing model is pushed by the air flow to move upwards for a set second distance, so that the formed workpiece is separated from the model base.
According to the pneumatic demoulding deep cavity injection molding mold and the demoulding method, when the pneumatic demoulding deep cavity injection molding mold is used, the processing mold is firstly arranged on the fixed mold, the processing mold can be regarded as a part of a traditional fixed mold, wherein the processing mold is used for molding one side of a workpiece, the surface of the movable mold opposite to the processing mold is used for molding the other side of the workpiece, when the fixed mold and the movable mold are tightly connected, injection molding is carried out in the injection molding cavity, after solidification molding of plastic to be injected, the movable mold is driven to move upwards so as to separate from the fixed mold, as the diversion component is fixed on the fixed mold, a part of the diversion component is movably arranged in the first installation hole, and when the movable mold is far away from the fixed mold, the space between the first installation hole and the diversion component is compressed, the internal air can flow along the diversion component to the lower part of the processing mold, in the process, and when the movable mold and the fixed mold reach a set first distance, the air flow accumulated below the processing mold can simultaneously flow to the processing mold, and the top and the bottom of the processing mold are separated, so that the injection molding cavity surface of the molded workpiece is driven to be separated, and the subsequent removal is facilitated. The deep cavity injection molding mold utilizes the distance change between the movable mold and the fixed mold, converts the distance change into airflow flow for ejecting a molded workpiece from an injection molding cavity after the movable mold is separated from the fixed mold, and utilizes the driving force of the movable mold in a demolding mode. In the process, only when the movable die and the fixed die reach a set first distance, the air flow can prop against the top of the movable processing die, so that the formed workpiece is ejected out and collides with the movable die when the movable die is just separated from the fixed die, and the use is safer.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a mold according to the present invention;
FIG. 2 is a schematic cross-sectional view of a mold according to the present invention;
FIG. 3 is a schematic view of a partial cross-sectional structure of a mold according to the present invention;
fig. 4 is a schematic structural diagram of a fixed mold provided by the invention;
FIG. 5 is a schematic view of a cooling assembly according to the present invention;
FIG. 6 is a schematic cross-sectional view of a base according to the present invention;
FIG. 7 is a schematic view of a processing model according to the present invention;
fig. 8 is a schematic structural diagram of a movable mold provided by the invention.
Reference numerals:
100. a die mounting base; 110. a base; 111. an air intake passage; 112. an air outlet channel; 113. a cooling water passage; 120. a first positioning tube; 200. a fixed mold; 210. a first mounting hole; 220. a mounting cavity; 230. a boss; 300. processing a model; 310. a mounting plate; 320. a model base; 330. a model top cover; 340. a second positioning tube; 400. a movable mold; 410. an injection cavity; 420. a second mounting hole; 430. a groove; 500. a flow guiding assembly; 510. a fixed tube; 511. air holes; 520. a positioning block; 600. a cooling assembly; 610. a first connection pipe; 620. a second connection pipe; 700. and a third connection pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes a deep cavity injection molding mold and a demolding method for pneumatic demolding in accordance with the present invention with reference to fig. 1 to 8.
As shown in fig. 1 to 3, in one embodiment, a pneumatic demolding deep cavity injection molding mold includes a fixed mold 200 and a movable mold 400 installed opposite to each other up and down, a processing mold 300, and a guide assembly 500; the movable mold 400 is provided with a first mounting hole 210; the processing model 300 is mounted on the fixed die 200, and an injection cavity 410 is formed between the processing model 300 and the movable die 400, and the processing model 300 comprises two parts which are narrow at the upper part and wide at the lower part and can be split; the guide assembly 500 is movably mounted in the first mounting hole 210, one end of the guide assembly 500 is fixedly connected to the fixed mold 200, when the movable mold 400 is separated from the fixed mold 200, the space between the first mounting hole 210 and the guide assembly 500 is compressed, when the movable mold 400 and the fixed mold 200 reach a set first distance, the air flow in the first mounting hole 210 is guided to the processing mold 300, and the top of the processing mold 300 is pushed by the air flow to move upwards by a set second distance.
In the above-mentioned pneumatic demoulding deep cavity injection molding mold, when in use, the processing mold 300 is first installed on the fixed mold 200, the processing mold 300 can be considered as a part of the traditional fixed mold 200, wherein the processing mold 300 is used for molding one surface of a workpiece, the surface of the movable mold 400 opposite to the processing mold 300 is used for molding the other surface of the workpiece, when the fixed mold 200 and the movable mold 400 are tightly combined, the injection molding cavity 410 is injected, after the injected plastic is solidified and molded, the movable mold 400 is driven to move upwards so as to separate from the fixed mold 200, because the diversion assembly 500 is fixed on the fixed mold 200, and a part of the diversion assembly 500 is movably installed in the first installation hole 210, and when the movable mold 400 is far away from the fixed mold 200, the space between the first installation hole 210 and the diversion assembly 500 is compressed, and the air in the process can flow along the diversion assembly 500 to the lower part of the processing mold 300, in the process, the air flow can be accumulated under the processing mold 300, and when the movable mold 400 and the fixed mold 200 reach a set first distance, the accumulated air flow under the processing mold 300 can be simultaneously gushed to the upper part 300, and the bottom part is separated from the injection molding cavity 300, so as to separate from the surface of the workpiece after the injection molding cavity 410 is taken out. The deep cavity injection molding mold utilizes the distance change between the movable mold 400 and the fixed mold 200 and converts the distance change into airflow flow for ejecting a molded workpiece from the injection molding cavity 410 after the movable mold 400 is separated from the fixed mold 200, and the demolding mode utilizes the driving force of the movable mold 400. In the process, only when the movable die 400 and the fixed die 200 reach a set first distance, the air flow can push the top of the movable processing die 300, so that the formed workpiece is prevented from being ejected and colliding with the movable die 400 when the movable die 400 is just separated from the fixed die 200, and the use is safer.
As shown in fig. 4 and 8, in one embodiment, in the pneumatic demolding deep cavity injection molding mold provided by the invention, a first mounting hole 210 is formed at a corner of the upper surface of a fixed mold 200 and is used for mounting a flow guide assembly 500, a mounting cavity 220 is formed in the middle of the upper surface of the fixed mold 200 and is used for mounting a processing mold 300, and a boss 230 is arranged at the edge of the upper surface of the fixed mold 200; an injection cavity 410 is formed in the middle of the lower surface of the movable die 400 and used for accommodating the processing model 300, a second mounting hole 420 coaxial with the first mounting hole 210 is formed in the corner of the lower surface of the movable die 400 and used for mounting the flow guide assembly 500, and a groove 430 matched with the boss 230 is formed in the edge of the lower surface of the movable die 400.
The first mounting holes 210 are provided with four groups, which are respectively positioned at the angles of the adjacent sides of the fixed mold 200, the second mounting holes 420 are also provided with four groups, which are respectively positioned at the angles of the adjacent sides of the movable mold 400, and the grooves 430 corresponding to the bosses 230 are formed on the movable mold 400 by arranging the bosses 230 on the fixed mold 200, so that the mold is more stable in mold closing and mold separating.
In one embodiment, the bottom end of the fixed mold 200 is provided with the mold mounting seat 100, the mold mounting seat 100 comprises a base 110 and a first positioning pipe 120, the base 110 is provided with an air inlet channel 111 coaxial with the first mounting hole 210 and an air outlet channel 112 opposite to the top of the processing mold 300, the air inlet channel 111 is communicated with the air outlet channel 112, the first positioning pipe 120 is arranged on the upper surface of the base 110, and the air outlet channel 112 is positioned in the range of the inner ring of the first positioning pipe 120.
The base 110 may be configured as a frame structure or adopt an internal hollow structure, where the air inlet channels 111 and the air outlet channels 112 are all vertically disposed, the air inlet channels 111 are provided with four groups, and are respectively located at four corners of the base 110, the air outlet channels 112 are located in the middle of the base 110, and bottom ends of the four air inlet channels 111 are respectively communicated with bottom ends of the air outlet channels 112 through a channel, and when the space in the first mounting hole 210 is compressed, air enters the inner ring range of the first positioning tube 120 along the air inlet channels 111 and the air outlet channels 112.
As shown in fig. 7, in one embodiment, the pneumatic demolding deep cavity injection molding mold provided by the invention, the processing mold 300 comprises a mounting plate 310, a mold base 320, a mold top cover 330 and a second positioning tube 340, wherein the mounting plate 310 is detachably mounted in the mounting cavity 220, the mold base 320 is fixed on the mounting plate 310, the mold top cover 330 is detachably mounted on the mold base 320, the joint of the mold top cover 330 and the mold base 320 is in sealing arrangement, the second positioning tube 340 is arranged on the ground in the mold top cover 330, and the second positioning tube 340 is movably inserted in the first positioning tube 120.
The processing model 300 is used for processing a workpiece with regular shape, so that the top of the processing model 300 is the most middle position of the workpiece, which may be the top of the workpiece or the bottom of the workpiece, and the bottom of the processing model 300 is the edge position of the workpiece. Through setting up processing model 300 to top and bottom detachable, and both junction are in the sealed setting of joint time course, can effectively avoid the outward appearance influence that causes when moulding plastics. Because the mold adopts pneumatic pushing of the mold top cover 330 to disengage from the mold base 320, and the mold top cover 330 is reinserted onto the mold base 320 only when the movable mold 400 is re-engaged with the stationary mold 200, frequent or abrupt movements can be avoided from damaging the working mold 300, and the service life can be prolonged.
In one embodiment, in the pneumatic demolding deep cavity injection molding mold provided by the invention, the air guide is arranged at the communication position of the air outlet channel 112 and the first positioning pipe 120, when the air guide detects that the air pressure is smaller than the set threshold value, the air guide is kept closed, the air outlet channel 112 is isolated from the interior of the first positioning pipe 120, when the air guide detects that the air pressure reaches the set threshold value, the air guide is opened, and the air outlet channel 112 is communicated with the interior of the first positioning pipe 120.
The air guide member may be an air valve having an air pressure detecting function, or may be a functional member constituted by an air valve and an air pressure sensor, or may be any member capable of realizing an air pressure detecting and ventilating function, or may be any assembly thereof. The air guide is arranged such that the mold top cover 330 is separated from the mold base 320 only when the movable mold 400 is separated from the fixed mold 200 by a first distance, so as to avoid collision between the processing mold 300 and the movable mold 400.
In one embodiment, the flow guiding assembly 500 comprises a fixed tube 510 and a positioning block 520, one end of the fixed tube 510 is fixed on the base 110, the inside of the fixed tube 510 is communicated with the air inlet channel 111, the fixed tube 510 is positioned in the first mounting hole 210 and the second mounting hole 420, the positioning block 520 is movably clamped in the second mounting hole 420 and is connected with the end part of the fixed tube 510, an air hole 511 is formed in the fixed tube 510, a closed space is formed among the fixed tube 510, the positioning block 520 and the second mounting hole 420, when the movable die 400 is far away from the fixed die 200, the closed space is compressed, and air flow in the closed space flows into the fixed tube 510 through the air hole 511.
As shown in fig. 5, in one embodiment, a cooling assembly 600 is disposed between a processing mold 300 and a first positioning tube 120 in the pneumatic demolding deep cavity injection molding mold provided by the invention, a plurality of cooling water channels 113 are formed in a base 110, one end of each cooling water channel 113 penetrates through the upper surface of the base 110, the other end of each cooling water channel 113 penetrates through the side surface of the base 110, one end of each cooling assembly 600 is fixed on the base 110 and is communicated with one cooling water channel 113, the other end of each cooling assembly 600 extends upwards to be close to a mold top cover 330 and then bends downwards to be communicated with the other cooling water channel 113, the cooling assemblies 600 are provided in a plurality, and the cooling assemblies 600 are arranged in an annular array around the central axis of the first positioning tube 120.
By arranging the structure of the cooling water component, the cooling water component can be attached to the inner surface of the processing model 300 as widely as possible, so that the plastic on the outer surface of the processing model 300 can be rapidly cooled and molded.
As shown in fig. 6, in the pneumatic demolding deep cavity injection molding mold provided by the present invention, two adjacent cooling water channels 113 are connected through a third connection pipe 700 at one end penetrating through the side surface of the base 110, so that after cooling water is injected into one cooling water channel 113, the cooling water can sequentially pass through a plurality of cooling assemblies 600 and flow out from another cooling water channel 113.
In order to keep the cooling water flowing through the cooling water channel 113 within a certain temperature range all the time, the heat exchange box can be fixed at the side of the base 110, and a heat exchange member is disposed in the heat exchange box, through which the third connection pipe 700 passes. When the temperature of the cooling water in the cooling water channel 113 is increased after passing through the sequential cooling assembly 600, and a better heat exchange effect is difficult to achieve, the temperature of the cooling water flowing through the heat exchange member can be reduced again to a certain range through heat exchange.
In one embodiment, the cooling assembly 600 of the pneumatic demolding deep cavity injection molding mold provided by the invention comprises two first connecting pipes 610 and a second connecting pipe 620, wherein the two first connecting pipes 610 are the same in distance from the inner surface of the processing mold 300, the second connecting pipe 620 is arranged in an arc shape, and the distance from the inner surface of the processing mold 300 is the same, and two ends of the second connecting pipe 620 are respectively communicated with the two first connecting pipes 610.
The frame structure of the cooling assembly 600 is matched with the inner surface of the processing model 300, and a certain interval is arranged between the frame structure and the inner surface of the processing model 300, so that cooling water flowing through the cooling assembly 600 can exchange heat and cool the processing model 300, and the plastic in the injection cavity 410 can be cooled and solidified rapidly.
In one embodiment, a method of pneumatically demolding a deep cavity injection molding mold, comprising the steps of:
when the movable die is separated from the fixed die, the space between the first mounting hole and the flow guide assembly is compressed.
When the moving die and the fixed die reach a set first distance, air flow in the first mounting hole is guided to the processing model, and the top of the processing model is pushed by the air flow to move upwards for a set second distance, so that the formed workpiece is separated from the model base.
According to the demoulding method of the pneumatic demoulding deep cavity injection moulding mould, when the movable mould is far away from the fixed mould, the space between the first mounting hole and the flow guiding component is compressed, the air in the space can flow to the lower part of the processing mould along the flow guiding component, in the process, the air flow can be accumulated below the processing mould, when the movable mould and the fixed mould reach a set first distance, the air flow accumulated below the processing mould can be simultaneously flushed to the processing mould, the top and the bottom of the processing mould are separated, and therefore a formed workpiece is driven to be separated from the surface of the injection moulding cavity, and subsequent taking out is facilitated. The deep cavity injection molding mold utilizes the distance change between the movable mold and the fixed mold, converts the distance change into airflow flow for ejecting a molded workpiece from an injection molding cavity after the movable mold is separated from the fixed mold, and utilizes the driving force of the movable mold in a demolding mode. In the process, only when the movable die and the fixed die reach a set first distance, the air flow can prop against the top of the movable processing die, so that the formed workpiece is ejected out and collides with the movable die when the movable die is just separated from the fixed die, and the use is safer.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (6)

1. A pneumatic demolded deep cavity injection molding mold, comprising:
a fixed die and a movable die which are arranged up and down oppositely, wherein a first mounting hole is formed in the movable die;
the processing model is arranged on the fixed die and forms an injection cavity with the movable die, and comprises two parts which are narrow at the upper part and wide at the lower part and can be split;
the guide assembly is movably arranged in the first mounting hole, one end of the guide assembly is fixedly connected to the fixed die, when the movable die is separated from the fixed die, the space between the first mounting hole and the guide assembly is compressed, when the movable die and the fixed die reach a set first distance, air flow in the first mounting hole is guided to the processing model, and the top of the processing model is pushed to move upwards by the air flow for a set second distance;
a first mounting hole is formed in the corner of the upper surface of the fixed die and used for mounting the flow guide assembly, a mounting cavity is formed in the middle of the upper surface of the fixed die and used for mounting the processing model, and a boss is arranged at the edge of the upper surface of the fixed die; an injection cavity is formed in the middle of the lower surface of the movable die and used for accommodating the processing model, a second mounting hole coaxial with the first mounting hole is formed in the corner of the lower surface of the movable die and used for mounting the flow guide assembly, and a groove matched with the boss is formed in the edge of the lower surface of the movable die;
the bottom end of the fixed die is provided with a die mounting seat, the die mounting seat comprises a base and a first positioning tube, an air inlet channel coaxial with the first mounting hole and an air outlet channel opposite to the top of the processing model are formed in the base, the air inlet channel is communicated with the air outlet channel, the first positioning tube is arranged on the upper surface of the base, and the air outlet channel is located in the range of an inner ring of the first positioning tube;
the processing model comprises a mounting plate, a model base, a model top cover and a second positioning pipe, wherein the mounting plate is detachably arranged in the mounting cavity, the model base is fixed on the mounting plate, the model top cover is detachably arranged on the model base, the joint of the model top cover and the model base is sealed, the second positioning pipe is arranged on the ground in the model top cover, and the second positioning pipe is movably inserted in the first positioning pipe;
the top of the processing model is the most middle position of the workpiece, and the bottom of the processing model is the edge position of the workpiece.
2. The pneumatic demoulding's dark chamber injection moulding mould according to claim 1, wherein the air outlet channel is provided with the air guide piece with first position pipe intercommunication department, when the air guide piece detects that atmospheric pressure is less than the settlement threshold value, the air guide piece keeps closed, the air outlet channel with first position pipe inside is isolated, when the air guide piece detects that atmospheric pressure reaches the settlement threshold value, the air guide piece is opened, the air outlet channel with first position pipe inside intercommunication.
3. The deep cavity injection molding die for pneumatic demolding according to claim 2, wherein the flow guiding assembly comprises a fixed pipe and a positioning block, one end of the fixed pipe is fixed on the base, the inside of the fixed pipe is communicated with the air inlet channel, the fixed pipe is positioned in the first mounting hole and the second mounting hole, the positioning block is movably clamped in the second mounting hole and is connected with the end part of the fixed pipe, an air hole is formed in the fixed pipe, a closed space is formed among the fixed pipe, the positioning block and the second mounting hole, when the movable die is far away from the fixed die, the closed space is compressed, and air flow in the closed space flows into the fixed pipe through the air hole.
4. The deep cavity injection molding die for pneumatic demolding according to claim 3, wherein a cooling assembly is arranged between the processing model and the first positioning pipe, a plurality of cooling water channels are formed in the base, one ends of the cooling water channels penetrate through the upper surface of the base, the other ends of the cooling water channels penetrate through the side surface of the base, one ends of the cooling assembly are fixed on the base and are communicated with one cooling water channel, the other ends of the cooling assembly extend upwards to be close to the top cover of the model and then bend downwards to be communicated with the other cooling water channel, and a plurality of cooling assemblies are arranged in an annular array around the central axis of the first positioning pipe.
5. The pneumatic stripping deep cavity injection molding die according to claim 4, wherein one end of two adjacent cooling water channels penetrating through the side surface of the base is connected by a third connecting pipe, so that after cooling water is injected into one cooling water channel, the cooling water can sequentially pass through a plurality of cooling assemblies and flow out from the other cooling water channel.
6. The pneumatic demolded deep cavity injection molding die of claim 5, wherein the cooling assembly comprises two first connecting pipes and a second connecting pipe, the two first connecting pipes are the same in distance from the inner surface of the processing model, the second connecting pipes are arc-shaped and are the same in distance from the inner surface of the processing model, and two ends of the second connecting pipes are respectively communicated with the two first connecting pipes.
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CN113787667A (en) * 2021-08-17 2021-12-14 朱海滨 Adopt rubber production of vapour-pressure type drawing of patterns to use device of moulding plastics
CN114248406A (en) * 2021-12-27 2022-03-29 董野 Injection mold with automatic demoulding mechanism
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009978A (en) * 1974-04-18 1977-03-01 Hanning-Elektro-Werke Robert Hanning Molding system with automatic fluid treatment of mold cavity
JPH03261527A (en) * 1990-03-12 1991-11-21 Mitsubishi Materials Corp Method and mold for forming cassette half
JPH06170898A (en) * 1992-12-07 1994-06-21 Nisshin Koki Kk Injection molding machine
JPH09193174A (en) * 1996-01-19 1997-07-29 Shin Etsu Polymer Co Ltd Apparatus for extracting elastic molded product and method
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