CN114734590B - Injection mold and injection molding method - Google Patents
Injection mold and injection molding method Download PDFInfo
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- CN114734590B CN114734590B CN202210254482.8A CN202210254482A CN114734590B CN 114734590 B CN114734590 B CN 114734590B CN 202210254482 A CN202210254482 A CN 202210254482A CN 114734590 B CN114734590 B CN 114734590B
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 35
- 238000005520 cutting process Methods 0.000 claims abstract description 133
- 238000002347 injection Methods 0.000 claims abstract description 65
- 239000007924 injection Substances 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000002699 waste material Substances 0.000 claims description 34
- 229920003023 plastic Polymers 0.000 claims description 31
- 239000004033 plastic Substances 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 18
- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000243 solution Substances 0.000 description 7
- 238000010008 shearing Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
- 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
- B29C45/38—Cutting-off equipment for sprues or ingates
Landscapes
- 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 application provides an injection mold and an injection molding method, wherein the injection mold comprises a mold main body, a mold core and a cutting structure, wherein a mold core channel is formed in the mold main body, one end of the mold core channel is provided with an opening communicated with the outside, and the upper surface of the mold main body is provided with a water gap penetrating through the cavity wall of the mold core channel; the mold core is arranged in the mold core channel and is arranged at intervals with the side wall of the mold core channel to form an elbow cavity in a surrounding mode; the cutting structure comprises a stop part and a slice convexly arranged on the stop part, the slice is inserted into the cavity and is attached to the cavity wall of the bent pipe cavity, a cutting hole which is arranged opposite to the water gap is formed in the slice, the stop part seals the opening, and the cutting structure can rotate around the circle center of the bent pipe cavity so that the slice can enter and exit the cavity. According to the technical scheme, the injection molding efficiency of the bent pipe can be improved, and the consistency and the production yield of products are ensured.
Description
Technical Field
The invention relates to the technical field of automation, in particular to an injection mold and an injection molding method.
Background
The side gate is widely applied to the injection mold due to convenient manufacture, but is connected with the plastic part after the injection molding part is formed and taken out of the mold, and at present, a product and the gate are usually cut off and separated by a tool manually, so that the labor is increased, the production efficiency is low, the shearing shape is inconsistent, and the rejection rate is high.
Disclosure of Invention
The invention mainly aims to provide an injection mold and an injection molding method, which aim to improve the injection molding efficiency of bent pipes and ensure the consistency and the production yield of products.
In order to achieve the above object, the present invention provides an injection mold, comprising:
The mold comprises a mold body, wherein a core channel is formed in the mold body, one end of the core channel is provided with an opening communicated with the outside, and the upper surface of the mold body is provided with a water gap penetrating through the cavity wall of the core channel;
The mold core is arranged in the mold core channel and is arranged at intervals with the side wall of the mold core channel to form an elbow cavity in a surrounding mode; and
The cutting structure comprises a stop part and a slice convexly arranged on the stop part, the slice is inserted into the bent pipe cavity and is attached to the cavity wall of the bent pipe cavity, a cutting hole which is opposite to the water gap is formed in the slice, the stop part seals the opening, and the cutting structure can rotate around the circle center of the bent pipe cavity so that the slice can enter and exit the bent pipe cavity.
Optionally, the cutting structure further comprises a pressure sensor for detecting resistance of the slice cutting nozzle waste;
And/or, the side wall of the die main body is provided with a sealing groove, the opening is positioned on the bottom wall of the sealing groove, the surface of the stop part, which faces the opening, is convexly provided with an insertion part, the slice is convexly arranged on the surface of the insertion part, which is away from the stop part, and the insertion part is inserted into the sealing groove.
Optionally, the cutting structure further comprises a heating element, and the heating element is arranged on the slice so as to heat the joint of the slice and the water gap in the water gap cutting process.
Optionally, a water cooling channel is arranged in the mold core to cool the product in the water gap cutting process, so that the product is prevented from melting and deforming.
Optionally, the mold main body comprises a fixed mold and a movable mold, the upper surface of the fixed mold is a cambered surface and is provided with a first groove, the movable mold is arranged above the fixed mold in a lifting manner, the lower surface of the movable mold is a cambered surface matched with the upper surface of the fixed mold and is provided with a second groove, the slice is attached to the wall of the second groove, the first groove and the second groove are enclosed to form the core channel, and the upper surface of the movable mold is provided with the water gap;
The die main body further comprises a locking structure, the locking structure is arranged between the movable die and the cutting structure, so that the cutting structure is locked when the injection die is closed, and the cutting structure is released when the injection die is opened.
Optionally, the movable mold includes:
the main body part is provided with the second groove and the water gap;
An extension portion extending from a side of the main body portion where the opening is opened in a direction away from the main body portion; and
The guide part downwards extends from one end of the extending part, which is far away from the main body part, one side surface of the guide part, which faces the main body part, gradually inclines from top to bottom to the side, which is far away from the main body part, to form a guide inclined surface, and the stop part is abutted with the guide inclined surface so as to enable the die main body to open in the process that the cutting structure rotates to enable the slice to withdraw from the bent pipe cavity.
Optionally, the core is connected with the stop;
and/or the cross-sectional area of the cut hole is gradually reduced along the injection direction.
The invention also provides an injection molding method which is applied to the injection mold of any one of the above, and comprises the following steps:
Injecting molten plastic into a bent pipe cavity of an injection mold;
cooling for a preset time;
And rotating a cutting structure to cut the water gap waste and separate the slice from the bent pipe cavity.
Optionally, the step of rotating the cutting structure to cut the gate waste and disengage the cut piece from the elbow cavity comprises:
Rotating the cutting structure until the edge of the cutting hole of the slice is abutted with the joint of the water gap;
and if the resistance of the slice does not reach the preset resistance standard, controlling the rotary cutting structure to reset.
Optionally, after the step of controlling the reset of the rotary cutting structure, the method further includes:
cooling for a preset time;
Rotating the cutting structure until the edge of the cutting hole of the slice is abutted with the joint of the water gap;
And if the resistance of the slice reaches the preset resistance standard, continuously rotating the cutting structure to cut the water gap waste until the slice is separated from the bent pipe cavity.
According to the technical scheme, when the bent pipe is injection molded by adopting the injection mold, the stop part of the cutting structure seals the opening of the bent pipe cavity to prevent molten plastics from flowing out, meanwhile, the slice of the cutting structure forms at least part of the cavity wall of the cavity, and the slice is provided with the cutting hole which is opposite to the water gap of the mold main body, so that the molten plastics can flow into the bent pipe cavity for injection molding. After the molten plastic is coagulated to form the bent pipe, the cutting structure is rotated to enable the slice to be drawn out of the cavity, at the moment, the edge of the cutting hole can cut off connection between the water gap waste and the bent pipe in the rotation process, the slice moving track is consistent with the bent pipe hub, the cutting position is smooth, the consistency is high, therefore, the water gap waste is not needed to be manually sheared after the bent pipe is demolded, the injection molding efficiency of the bent pipe is improved, the problems of inconsistent shearing shape and high rejection rate caused by manually shearing the water gap waste are avoided, and the consistency and the production yield of products are guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an embodiment of an injection mold of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a block diagram of the injection mold of FIG. 1 when opened;
FIG. 4 is a diagram showing the connection of a cutting structure to a mandrel;
FIG. 5 is a flow chart of a first embodiment of the injection molding method of the present invention;
FIG. 6 is a flow chart of a second embodiment of the injection molding method of the present invention;
FIG. 7 is a flow chart of a third embodiment of the injection molding method of the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the 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.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention proposes an injection mold 100.
Referring to fig. 1 to 7, in some embodiments of the injection mold 100 of the present invention, the injection mold 100 includes:
A mold body 10, wherein a core channel is formed in the mold body 10, an opening communicating with the core channel is formed on one side of the mold body 10, the opening is located at one end of the core channel, and a water gap 125 penetrating to a cavity wall of the core channel is formed on the upper surface of the mold body 10;
The mold core 20 is arranged in the mold core channel, and is arranged at intervals with the side wall of the mold core channel to form an elbow cavity 21 in a surrounding mode; and
The cutting structure 30, the cutting structure 30 includes a stop portion 31 and a slice 32 protruding from the stop portion 31, the slice 32 is inserted into the cavity and is attached to the wall of the elbow cavity 21, the slice 32 is provided with a cutting hole 321 opposite to the water gap 125, the stop portion 31 seals the opening, and the cutting structure 30 can rotate around the center of the elbow cavity 21, so that the slice 32 enters and exits the cavity.
Based on the hardware framework, the invention also provides an injection molding method, which comprises the following steps:
step S10, injecting molten plastic into the bent pipe cavity 21 of the injection mold 100;
step S20, cooling for a preset time;
Step S30, rotating the cutting structure 30 to cut the nozzle waste and disengage the slice 32 from the elbow cavity 21.
The injection mold 100 provided by the application is mainly applied to the injection molding of the bent pipe, wherein the bent pipe can be a bent pipe product with single curvature, can be a composite product formed by sequentially connecting bent pipes with different curvatures, and can be a composite product of the bent pipe and a straight pipe, and the end of the bent pipe is only required to be in a bent shape without limitation. In this embodiment, the slice 32 of the cutting structure 30 is inserted into the elbow cavity 21 and is attached to the cavity wall provided with the water gap 125 to be used as a part of the cavity wall, meanwhile, the slice 32 is provided with a cut hole 321 which is opposite to and communicated with the water gap 125, so that molten plastic can enter the elbow cavity 21 for injection molding through the water gap 125 and the cut hole 321, and one end opening of the elbow cavity 21 is blocked by the stop portion 31 of the cutting structure 30, so that the molten plastic can be prevented from flowing out of the cavity.
When the injection mold 100 of the present application is used to mold an elbow, molten plastic is injected into the elbow cavity 21 through the gate 125 and the cut hole 321 in sequence, after the molten plastic is cooled and molded for a preset time, the cutting structure 30 is rotated to withdraw the slice 32 from the cavity, at this time, the edge of the cut hole 321 is used as a cutting part to cut off the junction of the gate 125 so that the gate 125 is separated from the elbow, and there is no need to manually cut off gate waste after the elbow is demolded as in the conventional manner, and then the product is withdrawn from the mold body 10. The injection mold 100 can cut the water gap 125 by utilizing the cutting structure 30 before demolding, the cutting structure 30 rotates around the circle center of the bent pipe, the cutting track is attached to the outline of the bent pipe, the surface of the cut bent pipe is smooth, the consistency is high, and the risk of damaging the bent pipe in the water gap 125 cutting process is reduced.
Therefore, it can be understood that in the technical solution of the present invention, when the injection mold 100 is used for injection molding of the bent pipe, the stop portion 31 of the cutting structure 30 seals the opening of the bent pipe cavity 21 to prevent the molten plastic from flowing out, meanwhile, the slice 32 of the cutting structure 30 forms at least part of the cavity wall of the cavity, and the slice 32 is provided with the cut hole 321 opposite to the water gap 125 of the mold main body 10, so that the molten plastic can flow into the bent pipe cavity 21 for injection molding. After the molten plastic is coagulated to form the bent pipe, the cutting structure 30 is rotated to enable the slice 32 to be drawn out of the cavity, at this time, the edge of the cutting hole 321 can cut off connection between the water gap waste and the bent pipe in the rotation process, the moving track of the slice 32 is consistent with the hub of the bent pipe, the cutting position is smooth and high in consistency, therefore, the water gap waste is not needed to be manually sheared after the bent pipe is demoulded, the injection molding efficiency of the bent pipe is improved, the problems of inconsistent shearing shape and high rejection rate caused by manually shearing the water gap waste are avoided, and the consistency and the production yield of products are guaranteed.
It should be noted that, the injection mold 100 provided by the present application may be applied to a bent pipe product with a single curvature, or may be a composite product in which bent pipes with different curvatures are sequentially connected, or may be a composite product of a bent pipe and a straight pipe, and when the injection molded product is a bent pipe product with a single curvature, the mold main body 10 may be an integral structure, and only the product needs to be rotationally demolded along the cavity; in general, the mold main body 10 includes a fixed mold 11 and a movable mold 12 which are matched with each other, the fixed mold 11 and the movable mold 12 are mutually covered to form a core channel, and when the mold is released, the movable mold 12 is removed to release the product.
In some embodiments of the injection mold 100 of the present invention, the cutting structure 30 further includes a pressure sensor provided on the slice 32 for detecting resistance of the slice 32 when cutting the nozzle waste.
Referring to fig. 6, based on the hardware architecture, in the injection molding method according to the present invention, the step of cutting the gate waste material and disengaging the slice 32 from the elbow cavity 21 by the rotary cutting structure 30 includes:
step S23, rotating the cutting structure 30 until the edge of the cutting hole 321 of the slice 32 is abutted with the joint of the water gap 125;
In step S25, if the resistance of the slice 32 does not reach the preset resistance standard, the cutting structure 30 is controlled to reset.
In this embodiment, a pressure sensor is disposed on the slice 32 of the cutting structure 30, and is used to detect the resistance applied when the slice 32 cuts the water gap waste, at this time, the blocked force can be fed back to the control center to calculate the product hardness, or the resistance range corresponding to each hardness value is stored in the system, so as to determine the solidification degree of the molten plastic in the injection mold 100, if the blocked force of the slice 32 is smaller than the preset resistance, it can be determined that the product is not completely solidified, at this time, the control center controls the cutting structure 30 to stop rotating, and drives the cutting structure 30 to reset, so that the setting can avoid the operator from triggering the cutting structure 30 to rotate by mistake before the product is completely solidified, and thus the prevention and protection effects are achieved.
With further reference to fig. 6, in the injection molding method according to the present invention, after the step of controlling the reset of the rotary cutting structure 30, the method further includes:
step S27, cooling for a preset time;
Step S29, rotating the cutting structure 30 until the edge of the cutting hole 321 of the slice 32 is abutted with the joint of the water gap 125;
Step S30, if the resistance of the slice 32 reaches the preset resistance standard, continuously rotating the cutting structure 30 to cut the nozzle waste until the slice 32 is separated from the elbow cavity 21.
It will be appreciated that the time for cooling the molten plastic is affected by the external environment and the operating state and arrangement of the cooling structure in the injection mold 100, and the cooling time can be calculated, but if unexpected factors such as sudden changes in external temperature or operation failure of the cooling structure occur, the product may not be solidified and formed until reaching the preset cooling time, and the product is cooled for a certain period of time, which can be calculated and obtained according to the current solidification state and hardness of the product, the step of measuring the resistance of the slice 32 is repeated until the resistance reaches the preset resistance standard, so as to ensure that the cut structure 30 is continuously rotated to cut the water gap waste after the product is completely solidified and formed until the slice 32 is separated from the bent pipe cavity 21, and the subsequent product demoulding operation is performed.
That is, in this embodiment, by setting the pressure sensor, it is possible to ensure that the operation of cutting the nozzle waste is performed after the product is completely solidified, and avoid the problem that the cutting structure 30 starts to rotate when the product is completely solidified, resulting in deformation of the product and outflow of molten plastic, thereby improving the production yield and the use safety.
Referring to fig. 3, in some embodiments of the injection mold 100 of the present invention, a sealing groove 126 is formed on a side wall of the mold body 10, the opening is located at a bottom wall of the sealing groove 126, an insertion portion 33 is protruding from a surface of the stop portion 31 facing the opening, the slice 32 is protruding from a surface of the insertion portion 33 facing away from the stop portion 31, and the insertion portion 33 is inserted into the sealing groove 126.
In this embodiment, the insertion portion 33 is in plug-in fit with the seal groove 126, so that the cavity can be further closed during mold closing, the molten plastic is prevented from flowing out, and the safety of the injection molding process is improved. In the technical solution of the foregoing embodiment, a pressure sensor is provided, at this time, the cutting structure 30 needs to be rotated by a short distance to make the junction between the slice 32 and the nozzle 125 abut to obtain the product hardness, and the arrangement of the insertion portion 33 and the seal groove 126 provides a buffer distance for the cutting structure 30 to rotate by a short distance, and the elbow cavity 21 can still be closed by rotating the cutting structure 30 within this distance, so as to avoid the molten plastic from flowing out and improve the safety of the injection molding process.
Further, in some embodiments, the injection mold 100 further includes a seal sandwiched between the sidewall of the insert 33 and the groove sidewall of the seal groove 126 and disposed around the insert 33 to further improve the sealing. Still further, the side wall of the insertion portion 33 is provided with a limit groove, the limit groove is circumferentially arranged along the insertion portion 33, the sealing member is a sealing ring 34, and the sealing ring 34 is arranged at the notch of the limit groove and protrudes out of the limit groove, so as to ensure that the sealing ring 34 can be abutted against the groove side wall of the sealing groove 126. The sealing ring 34 may be made of perfluororubber, which has better high temperature resistance, can resist the high temperature range reaching 327 degrees, has better elasticity, and deforms when being pressed to better fit the gap between the sealing insert 33 and the groove wall of the sealing groove 126.
Referring to fig. 1 and 3, in some embodiments of the injection mold 100 of the present invention, the mold main body 10 includes a fixed mold 11 and a movable mold 12, the upper surface of the fixed mold 11 is a cambered surface, a first groove 111 is formed, the movable mold 12 is disposed above the fixed mold 11 in a liftable manner, the lower surface of the movable mold 12 is a cambered surface adapted to the upper surface of the fixed mold 11, a second groove 121 is formed, the slice 32 is attached to a groove wall of the second groove 121, the first groove 111 and the second groove 121 enclose to form the core channel, and the upper surface of the movable mold 12 is provided with the water gap 125.
In general, the mold main body 10 includes a fixed mold 11 and a movable mold 12, at this time, a first groove 111 is formed on an upper surface of the fixed mold 11, a second groove 121 is formed on a lower surface of the movable mold 12, when the movable mold 12 and the fixed mold 11 are clamped, the first groove 111 and the second groove 121 enclose, and the slice 32 is bonded with a groove wall of the second groove 121 and encloses with the first groove 111 to form a core channel, and the core 20 is inserted in the core channel and encloses with an inner wall of the core channel at intervals to form a cavity. At this time, the water gap 125 of the molten plastic driven mold 12 is injected into the bent pipe cavity 21, after the molten plastic is cooled and shaped, the cutting structure 30 is rotated to withdraw the slice 32 from the cavity to cut off the connection between the water gap waste and the product, at this time, the movable mold 12 is moved upwards, so that the bent pipe is exposed, and the user can take out the product conveniently.
In some embodiments of the injection mold 100 of the present invention, one of a guide post and a guide hole is provided on a surface of the movable mold 12 facing the fixed mold 11, the other of the guide post and the guide hole is provided on a surface of the fixed mold 11 facing the movable mold 12, and the guide post extends in a vertical direction and is inserted into the guide hole.
In this embodiment, a guiding structure is disposed between the movable mold 12 and the fixed mold 11, and the guiding structure includes a guiding post and a guiding hole that are in insertion fit, so that when the movable mold 12 is lifted, the guiding post is lifted in the guiding hole to guide the moving direction of the movable mold 12, so that the mold opening and closing process of the mold main body 10 is more stable, and the defect of injection molding products caused by dislocation of the first groove 111 and the second groove 121 is avoided.
In some embodiments of the injection mold 100 of the present invention, the injection mold 100 further comprises a locking structure provided between the movable mold 12 and the cutting structure 30 to lock the cutting structure 30 when the injection mold 100 is closed and release the cutting structure 30 when the injection mold is opened.
In this embodiment, the injection mold 100 further includes a locking and releasing structure, where the locking and releasing structure is used to lock the movable mold 12 and the cutting structure 30 when the injection mold 100 is closed, so as to avoid the dislocation of the slice 32 caused by the rotation of the cutting structure 30 and the plugging of the gate 125, so that molten plastic cannot enter the cavity; at the same time, the cutting structure 30 can be guaranteed to rotate when the molten plastics in the cavity are not condensed, so that the stop part 31 can not block the opening of the bent pipe cavity 21 to flow out the molten plastics, and the stability and the safety in the process of manufacturing the bent pipe by adopting the injection mold 100 can be guaranteed due to the arrangement of the locking structure. And the locking and releasing structure locks the movable mould 12 and the cutting structure 30, and can limit the movable mould 12 before injection molding is completed.
The locking and releasing structure may be a buckle structure, a latch structure, or the like, and only needs to lock and keep the fixed relative position of the movable mold 12 and the cutting structure 30 when the mold is closed, which is not limited herein.
Referring to fig. 1 and 3, in some embodiments of the injection mold 100 of the present invention, the fixed mold 11 is provided with a sliding track, the sliding track and the first groove 111 are sequentially disposed along the rotation direction of the cutting structure 30, and the stop portion 31 is slidably disposed on the sliding track.
In this embodiment, cover half 11 is provided with the slip track, and stopper 31 slidable locates on the slip track, so sets up, can support stopper 31 through the slip track, improves the stability of stopper 31 slip process, and then improves the stability of section 32 cutting mouth of a river waste material in-process, guarantees the smoothness on product surface after mouth of a river 125 excision, improves the product yields.
Referring to fig. 1 and 3, in some embodiments of the injection mold 100 of the present invention, the injection mold 100 further includes a driving structure 40, the driving structure 40 includes a connecting rod 42 and a driving member 41, one end of the connecting rod 42 is rotatably disposed on the fixed mold 11 and is in driving connection with the driving member 41, and the other end of the connecting rod 42 is connected with the stop portion 31. The driving member 41 may be a driving motor, and one end of the connecting rod 42 is fixedly connected with an output shaft of the driving motor, so as to drive the cutting structure 30 to rotate reciprocally when the driving motor rotates positively and negatively. Of course, in some embodiments, the drive motor may be in driving connection with the link 42 via a transmission structure, such as a gear 43 transmission and/or a planetary gear 43 transmission, without limitation.
Still further, a gear 43 is coaxially fixed at a rotational connection end of the connecting rod 42, a rack 44 is disposed between the movable mold 12 and the fixed mold 11, the rack 44 extends along the arrangement direction of the movable mold 12 and the fixed mold 11, one end of the rack 44 is fixedly connected with the movable mold 12, and the rack 44 is liftably disposed on the movable mold 12 and meshed with the gear 43. At this time, when the driving member 41 drives the connecting rod 42 and the gear 43 to rotate synchronously, the slice 32 can be moved in and out of the bent pipe cavity 21, and meanwhile, the movable mold 12 and the fixed mold 11 are closed or opened, so that the automation degree of the injection mold 100 is improved, and the operation steps are reduced.
Referring to the drawings, in some embodiments of the injection mold 100 of the present invention, the movable mold 12 includes:
A main body 122, wherein the second groove 121 and the water gap 125 are formed in the main body 122;
an extension portion 123, wherein the extension portion 123 extends from a side of the main body portion 122 where the opening is formed in a direction away from the main body portion 122; and
The guide portion 124 extends downward from one end of the extending portion 123 away from the main body 122, a surface of the side of the guide portion 124 facing the main body 122 is gradually inclined from top to bottom to a side away from the main body 122 to form a guide inclined plane 1241, and the stop portion 31 abuts against the guide inclined plane 1241, so that the die main body 10 is opened in a process of rotating the cutting structure 30 to withdraw the slice 32 from the bent pipe cavity 21.
In some embodiments of the injection mold 100 of the present invention, the cutting structure 30 further includes a heating member provided to the slice 32 to heat the junction of the slice 32 and the nozzle 125 during the cutting of the nozzle 125.
In this embodiment, the cutting structure 30 further includes a heating element disposed on the slice 32, it can be understood that when the water gap 125 is cut, the elbow is already cooled and formed, at this time, the heating element heats the connection position of the water gap waste and the elbow, so that the connection position is softened, so that the slice 32 cuts the water gap 125, the slice 32 is prevented from being worn or passivated by a larger reaction force, the service life of the slice 32 is prolonged, and the cutting performance of the slice 32 is guaranteed. Further, the slice 32 is made of stainless steel, and has better thermal conductivity and rigidity, at this time, the heating element can be made of metal material such as copper wire, and embedded inside the slice 32, and two ends of the copper wire penetrate through the stop portion 31 to extend outwards for connecting with a power supply, so as to generate electricity when conducting electricity.
Referring to fig. 7, in some embodiments, the injection mold 100 further includes a pressure sensor disposed on the slice 32, and based on the hardware architecture, the injection molding method according to the present invention includes the steps of cutting the gate waste by the rotary cutting structure 30 and disengaging the slice 32 from the elbow cavity 21, including:
Step S31, rotating the cutting structure 30 to cut the water gap waste and heating the slices 32;
step S32, obtaining the resistance of the slice 32;
step S33, adjusting the rotation speed of the cutting structure 30 according to the blocked force until the slice 32 is separated from the elbow cavity 21.
In this embodiment, after ensuring that the product and the nozzle waste are completely cooled and condensed and formed, the heating element heats the connection position of the nozzle waste and the elbow pipe so that the connection position is softened, at this time, the blocking force of the slice 32 in the process of cutting the nozzle waste is reduced, so that the rotation speed of the cutting structure 30 can be increased, and the cutting efficiency of the nozzle waste is improved. Meanwhile, after the gate waste is cut off, the blocking force of the slice 32 is further reduced, at this time, the rotation speed of the cutting structure 30 can be further improved, so that the slice 32 is rapidly separated from the bent pipe cavity 21, demoulding is accelerated, and injection molding efficiency is improved.
In some embodiments of the injection mold 100 of the present invention, a water cooling channel is provided in the core 20 to cool the product during the cutting of the nozzle 125, thereby avoiding the product from melting and deforming.
According to the technical scheme of the embodiment, the joint of the water gap 125 is heated and softened by the heating piece, so that the cutting efficiency is improved, and the cutting position is smoothed by grinding the cut piece 32 after cutting. However, part of the injection molding plastic has certain heat conduction property, and if heated for a long time, the bent pipe is easy to deform or burn through. In this embodiment, a water cooling passage is provided in the core 20, which can be used for circulation of the cooling liquid. On the one hand, after the molten plastic is poured, the cooling liquid circularly flows in the water cooling channel, and can exchange heat with the molten plastic to enable the molten plastic to be rapidly cooled and solidified, so that the injection molding efficiency is improved; on the other hand, in the water gap 125 cutting process, the cooling liquid circularly flows in the water cooling channel, so that the product can be kept stable in solidification, deformation or perforation caused by heating the product to a molten state by the slice 32 is avoided, and the product yield is improved.
In some embodiments, the core 20 and the stop member are integrally disposed, at this time, the water inlet and the water outlet of the water cooling channel are both formed on one side of the stop member away from the core 20, so that the injection and the export of the cooling liquid are facilitated, the structure is simplified, and the operation is facilitated.
Referring to fig. 4, in some embodiments of the injection mold 100 of the present invention, the core 20 is connected to the stop 31.
In this embodiment, one end of the core 20 is fixedly connected to the stop portion 31, so that the core 20 can be carried out together during the process of withdrawing the cutting structure 30 from the cavity cutting gate 125, and the subsequent process of removing the core 20 is reduced. Meanwhile, by the arrangement, the clamping state of the mold core 20 and the slice 32 to the product is always kept, and the stability of the water gap 125 cutting process of the slice 32 is improved.
Referring to fig. 1 and 2, in some embodiments of the injection mold 100 of the present invention, the cross-sectional area of the cutting hole 321 is gradually reduced along the injection direction.
According to the technical scheme of the application, the slice 32 is pre-inserted into the bent pipe cavity 21 to be attached to the cavity wall of the cavity, and the cutting hole 321 communicated with the water gap 125 is formed, so that the water gap 125 is cut off through the inner edge of the cutting hole 321 when the slice 32 is extracted through injection solidification. In this embodiment, the cross-sectional area of the cutting hole 321 is gradually reduced along the injection direction to form an inverted cone structure, so that the molten plastic is advantageously introduced into the bent pipe cavity 21, and the inverted cone cutting hole 321 makes the inner edge of the bottom end of the cutting hole 321 thinner and sharper, which is more advantageous for cutting the water gap 125 by the slice 32, reduces the resistance of the cutting process of the slice 32 in cutting the water gap 125, and improves the cutting efficiency.
Further, in some embodiments, the cross-sectional area of the nozzle 125 tapers in the injection direction. So set up, can avoid the return bend to pull out in the return bend die cavity 21 in the mouth of a river waste material drops return bend die cavity 21, in some embodiments, mould main part 10 includes cover half 11 and movable mould 12, when the movable mould 12 upwards removes the drawing of patterns, mouth of a river 125 back taper setting also can make mouth of a river waste material rise with once, is favorable to mouth of a river waste material and product break away from. Still further, the bottom profile of the gate 125 is adapted to the top profile of the cut hole 321 to ensure complete injection of molten plastic into the elbow cavity 21, avoiding molten plastic from entering between the slice 32 and the cavity wall of the mold body 10.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (8)
1. An injection mold, comprising:
The mold comprises a mold body, wherein a core channel is formed in the mold body, one end of the core channel is provided with an opening communicated with the outside, and the upper surface of the mold body is provided with a water gap penetrating through the cavity wall of the core channel;
The mold core is arranged in the mold core channel and is arranged at intervals with the side wall of the mold core channel to form an elbow cavity in a surrounding mode; and
The cutting structure comprises a stop part and a slice convexly arranged on the stop part, the slice is inserted into the bent pipe cavity and is attached to the cavity wall of the bent pipe cavity, a cutting hole opposite to the water gap is formed in the slice, the stop part seals the opening, the cutting structure can rotate around the circle center of the bent pipe cavity so that the slice can enter and exit the bent pipe cavity, and the core is connected with the stop part;
The die comprises a die body and is characterized in that the die body comprises a fixed die, a movable die and a locking structure, the upper surface of the fixed die is a cambered surface and is provided with a first groove, the movable die is arranged above the fixed die in a lifting manner, the lower surface of the movable die is a cambered surface matched with the upper surface of the fixed die and is provided with a second groove, the slice is attached to the wall of the second groove, the first groove and the second groove are enclosed to form the core channel, and the upper surface of the movable die is provided with a water gap;
the locking and releasing structure is arranged between the movable mould and the cutting structure so as to lock the cutting structure when the injection mould is closed and release the cutting structure when the injection mould is opened;
the movable die comprises a main body part, an extension part and a guide part, wherein the second groove and the water gap are formed in the main body part, the extension part extends from one side of the main body part, which is provided with the opening, to the direction away from the main body part, the guide part extends downwards from one end of the extension part, which is away from the main body part, the guide part is gradually inclined from top to bottom, which is towards one side of the main body part, to one side, which is away from the main body part, to form a guide inclined surface, and the stop part is abutted to the guide inclined surface, so that the die main body is opened in the process of enabling a slice to exit from the bent pipe cavity through rotation of the cutting structure.
2. The injection mold of claim 1 wherein said cutting structure further comprises a pressure sensor for detecting resistance of said sliced cut nozzle scrap;
And/or, the side wall of the die main body is provided with a sealing groove, the opening is positioned on the bottom wall of the sealing groove, the surface of the stop part, which faces the opening, is convexly provided with an insertion part, the slice is convexly arranged on the surface of the insertion part, which is away from the stop part, and the insertion part is inserted into the sealing groove.
3. The injection mold of claim 1 wherein the cutting structure further comprises a heating element disposed on the slice to heat the junction of the slice and the nozzle during cutting of the nozzle.
4. An injection mold as claimed in claim 3 wherein a water cooling channel is provided in the core to cool the product during cutting of the nozzle to avoid melt deformation of the product.
5. The injection mold of any one of claims 1 to 4, wherein the cross-sectional area of the slit is gradually reduced in the injection direction.
6. An injection molding method applied to the injection mold according to any one of claims 1 to 5, characterized by comprising the steps of:
Injecting molten plastic into a bent pipe cavity of an injection mold;
cooling for a preset time;
And rotating a cutting structure to cut the water gap waste and separate the slice from the bent pipe cavity.
7. The injection molding method of claim 6, wherein the step of rotating the cutting structure to cut the nozzle waste and disengage the cut piece from the elbow cavity is preceded by:
Rotating the cutting structure until the edge of the cutting hole of the slice is abutted with the joint of the water gap;
and if the resistance of the slice does not reach the preset resistance standard, controlling the cutting structure to reset.
8. The injection molding method of claim 7, wherein after said step of controlling the reset of said rotary cutting structure, further comprising:
cooling for a preset time;
Rotating the cutting structure until the edge of the cutting hole of the slice is abutted with the joint of the water gap;
And if the resistance of the slice reaches the preset resistance standard, continuously rotating the cutting structure to cut the water gap waste until the slice is separated from the bent pipe cavity.
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| CN208247347U (en) * | 2018-05-24 | 2018-12-18 | 广州市铭成橡塑科技有限公司 | A kind of mould structure of no die parting line |
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| JP2001260182A (en) * | 2000-03-16 | 2001-09-25 | Toyota Motor Corp | Apparatus for producing curved hollow article |
| CN1891432A (en) * | 2005-07-01 | 2007-01-10 | 深圳富泰宏精密工业有限公司 | Automatic-cut waste material injection mould |
| JP6310385B2 (en) * | 2014-12-24 | 2018-04-11 | 豊田鉄工株式会社 | Hollow body forming equipment |
| CN211251230U (en) * | 2019-12-05 | 2020-08-14 | 浙江容德管业股份有限公司 | PE material pipeline forming equipment |
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| CN208247347U (en) * | 2018-05-24 | 2018-12-18 | 广州市铭成橡塑科技有限公司 | A kind of mould structure of no die parting line |
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