CN114030152A - Injection molding process - Google Patents
Injection molding process Download PDFInfo
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- CN114030152A CN114030152A CN202110666120.5A CN202110666120A CN114030152A CN 114030152 A CN114030152 A CN 114030152A CN 202110666120 A CN202110666120 A CN 202110666120A CN 114030152 A CN114030152 A CN 114030152A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 179
- 239000000463 material Substances 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 abstract description 55
- 230000000694 effects Effects 0.000 description 5
- 230000002265 prevention Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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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
- B29C45/76—Measuring, controlling or regulating
- B29C45/762—Measuring, controlling or regulating the sequence of operations of an injection cycle
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76648—Sequence, e.g. the order in which operations are conducted
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- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides an injection molding process which comprises the steps of storing, injecting, maintaining pressure, cooling and opening a mold. In the process of storing materials, the product is processed by the increased back pressure in the pressure maintaining step, so that the processing time of the pressure maintaining step can be shortened, and the period of the injection molding process is greatly reduced. In the storage process of the injection molding machine, the product is processed by the increased back pressure in the pressure maintaining step, so that the processing time of the pressure maintaining step can be shortened, and the period of the injection molding process is greatly reduced.
Description
Technical Field
The invention relates to the field of injection molding, in particular to an injection molding process.
Background
The injection molding can be divided into a valve needle type sprue and a large water gap sprue according to whether a valve needle for controlling the communication or the separation between the injection molding machine and the sprue is arranged in the injection molding machine. The valve needle type sprue is internally provided with a valve needle which can control the sprue to be communicated with or separated from the injection molding machine. And a large water gap gate which is always connected with the injection molding machine.
The injection molding process mainly comprises the process flows of material storage, injection, pressure maintaining, cooling, film opening, workpiece taking and the like; after injection of a certain product is completed, in order to ensure that the product does not have the phenomena of gate shrinkage and the like, pressure maintaining and cooling are carried out on the product, and then the process steps of mold opening and part taking are carried out. In order to save the processing period, the injection molding machine can be controlled to store materials for processing the next product in the process of cooling the product after the injection of the product is finished.
But even so, as the dwell pressure typically needs to go through the following three stages: the first stage of pressure maintaining and pressure releasing and mold expanding prevention, the second stage of pressure maintaining main body and product gate deformation prevention, and the third stage of gate pressure maintaining and product gate deformation prevention; still results in a longer injection molding cycle time for the product. In summary, there is a need for an injection molding process that can shorten the injection molding cycle and ensure that the product does not shrink at the gate.
The present invention has been made in view of the above problems.
Disclosure of Invention
The invention aims to provide an injection molding process, which can shorten the processing time of a pressure maintaining step and reduce the processing period of an injection molding product.
The invention provides an injection molding process which comprises the steps of storing, injecting, maintaining pressure, cooling and opening a mold. In the process of storing materials, the product is processed by the increased back pressure in the pressure maintaining step, so that the processing time of the pressure maintaining step can be shortened, and the period of the injection molding process is greatly reduced.
Further, the injection molding machine is always connected with a sprue of a product, and a runner of the injection molding machine is connected with the sprue of the product in a large water gap mode; and performing the processing of the gate pressure maintaining step on the product by utilizing the increased back pressure of the injection molding machine. When the connection mode between the runner of the injection molding machine and the product sprue is a large water gap sprue, the backpressure generated during the material storage of the injection molding machine can act on the product to perform pressure maintaining treatment on the product. The backpressure that produces when make full use of injection molding machine storage reaches the effect of saving the processing time of moulding plastics.
Further, the pressure maintaining step comprises the following three stages:
the first stage, pressure maintaining and releasing;
the second stage, the main body is kept pressure;
and in the third stage, keeping the pressure at the pouring gate.
And (3) performing pressure maintaining step processing on the product in a third stage by utilizing the back pressure increased by the injection molding machine, wherein the processing in the first stage and the processing in the second stage of the pressure maintaining step are normally performed between the injection step and the cooling step. The pressure maintaining steps provided by the invention are reasonable in stage setting, so that the processing precision of the large surface of the main body of the product can be ensured, and the processing precision of the gate can be ensured. The processing in the third stage is just the stage of maintaining the pressure of the sprue, the injection molding machine is always communicated with the sprue, and the backpressure of the injection molding machine can act on the sprue, so that the backpressure of the injection molding machine is utilized to maintain the pressure of the sprue, and the processing time of the pressure maintaining step can be saved.
Further, the process of the injection molding machine executing the material storing step at least sequentially goes through the following two stages:
the back pressure increasing stage controls the injection molding machine to increase the back pressure for storing
In the normal back pressure stage, controlling the injection molding machine to store materials at a normal back pressure value;
in the back pressure increasing stage, the back pressure of the injection molding machine is increased to perform pressure maintaining step processing on the product in the third stage; in the normal back pressure stage, the back pressure of the injection molding machine is adjusted to a normal value to execute the storage step processing of the product; the back pressure value in the back pressure increasing stage is P1, the back pressure value in the normal back pressure stage is P2, and P1 is more than P2.
The step of executing storage by the injection molding machine is subdivided into a backpressure increasing stage and a normal backpressure stage. The backpressure value through two stages sets up the difference for the pressurize step processing of third stage can be carried out to the runner of product simultaneously in the backpressure increase stage, and normal backpressure stage can normally carry out the storage, avoids backpressure too big time influence storage.
Further, in the back pressure increasing stage, the back pressure of the injection molding machine does not exceed the limit value for damaging the melt structure; preferably, P1 is 3-5 times as much as P2; preferably, the limit value is 45 MPa.
Further, when the back pressure increasing stage and the pressure maintaining step of the third stage are carried out simultaneously, the injection molding machine is controlled to slowly push the melted material into the shrinkage-prone area of the sprue by using the increased back pressure. The molten material is pushed into the pouring gate by using back pressure, so that the phenomenon of shrinkage at the pouring gate can be prevented.
Further, the specific way of adjusting the back pressure by the injection molding machine comprises: and in the process of executing the material storage step by the injection molding machine, the backpressure is adjusted through a software interface of the machine table, or the backpressure is manually adjusted through a backpressure valve.
Further, when the magnitude of the back pressure is adjusted through a software interface of the machine, the back pressure value and the duration of the back pressure increasing stage and the back pressure value and the duration of the normal back pressure stage are input into the software interface.
Further, the backpressure value of the backpressure increasing stage and the backpressure value of the normal backpressure stage are adjusted by inputting the maximum backpressure value in a software interface.
Further, in the process of executing the cooling step on any product, the injection molding machine is synchronously utilized to execute the processing of the storage step of the next product. The storage processing of the next product is synchronously carried out in the cooling process, the period of the injection molding process is shortened, and the effect of saving the processing time is achieved.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1) according to the injection molding process provided by the invention, in the process of cooling any product, the next product is synchronously processed in the storage step, the cycle of the injection molding process is shortened, and the processing time is correspondingly reduced. The invention also provides a method for processing the storage step while cooling, and the method can also be used for processing the product in the pressure maintaining step by using the increased back pressure, thereby further shortening the processing period of the injection molding process and greatly reducing the time for processing the product.
2) The injection molding process is particularly suitable for the step of processing the product by the way that the connecting mode between the runner of the injection molding machine and the sprue of the product is a large water gap sprue, and the screw rod of the injection molding machine and the like are always connected with the sprue of the product, so that the back pressure of the injection molding machine can act on the sprue of the product, and the product can be further subjected to pressure maintaining by utilizing the increased back pressure. The back pressure of the injection molding machine during the storage step processing is fully utilized, the effect of shortening the time length of the pressure maintaining step in the injection molding process is achieved, and the injection molding processing time is greatly shortened.
3) The pressure maintaining step in the injection molding process is divided into very detailed stages, so that the injection molding product can not expand, the general and large surface of the product can not deform, and the sprue of the injection molding product can not deform. The pressure maintaining stage comprises a third stage of pressure maintaining on the pouring gate, the back pressure of the injection molding machine during material storage is utilized to perform pressure maintaining processing on the pouring gate of the product, the back pressure is fully utilized, and the processing period of the injection molding process is greatly shortened.
4) The injection molding process of the invention is used for processing the material storage step, the processing of the material storage step can be divided into a plurality of different stages according to different set back pressures, at least divided into a back pressure increasing stage with larger back pressure and a normal back pressure stage with normal back pressure, the pressure maintaining operation on the sprue is simultaneously carried out by utilizing larger back pressure value in the back pressure increasing stage, and the material storage processing is carried out on the material by reducing the back pressure value to a normal range in the normal back pressure stage so as to avoid the damage to the material. Set up rationally like this for the injection molding machine adds man-hour in the storage step, can carry out pressurize step processing, can normally store again to the runner simultaneously, and both do not influence each other.
5) The invention provides a method for slowly pushing a melted material into a position where a sprue is easy to shrink by using the back pressure of an injection molding machine, so that the sprue can be supplemented, and the sprue is prevented from collapsing due to shrinkage.
6) The invention also provides a method for adjusting the backpressure by using the software interface of the injection molding machine table, so that the step of processing the sprue by using the increased backpressure while storing materials by using the injection molding machine is realized.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic view of the injection molding process steps of example 1 of the present invention;
FIG. 2 is a schematic view showing a subdivision of the pressure holding step in example 1 of the present invention;
fig. 3 is a schematic view of the subdivision of the stock step in embodiment 2 of the present invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
Generally, an injection molding process includes steps of storing, injecting, maintaining pressure, cooling, opening a mold, and the like, and the steps of storing, injecting, maintaining pressure, cooling, and opening a mold should be sequentially performed during injection molding, wherein each step needs to consume a certain time, and particularly, the step of cooling needs to consume a lot of time, which results in a long cycle of the injection molding process. After the injection molding piece is molded, the appearance of the injection molding piece is not flat and the accuracy of appearance processing is affected due to the fact that internal pressure and external pressure are not uniform, and therefore the step of pressure maintaining is needed to be carried out on the injection molding piece. The process step of pressure holding is in turn usually divided into a number of different stages, for example as follows: the first stage, pressure maintaining and releasing to prevent mold expansion; the second stage, the main body is maintained, and large-area deformation of the main body product is prevented; and in the third stage, the pressure of the pouring gate is maintained, and the accurate processing of the position of the pouring gate is ensured. Because three stages are needed in the process steps of pressure maintaining, the consumed time for pressure maintaining is longer, and the cycle of the injection molding process is longer. In addition, in the case of an injection molded product with a thick wall, the gate is easily deformed, so that the pressure maintaining step in the third stage is required. Currently, the pressure holding step of the third stage is usually performed at a low speed through low pressure, which results in a long duration of the pressure holding step. Or the deformation of the gate is reduced by designing a smaller gate, but the smaller gate can generally cause the problem of gate gas mark.
Therefore, the invention provides an injection molding process which can shorten the processing period of the injection molding process.
Example 1
The present embodiment provides an injection molding process, as shown in fig. 1, which proposes to perform the processing of the stock step of the next product by the injection molding machine simultaneously during the processing of performing the cooling step on any one product. Namely, the cooling step and the material storage step can be carried out synchronously, and the time length of the injection molding process is shortened.
The injection molding machine will impart pressure to the material in the molten state during the storing process by the screw, which is called back pressure. Almost all injection molding machine stations can adjust the numerical value of backpressure by themselves, the pressure provided by the backpressure is a section of stable pressure, and the injection molded product needs stable pressure in the pressure maintaining process, so that the stable backpressure can be used for providing pressure for the pressure maintaining process of the injection molded product. Therefore, in the product cooling process, the injection molding machine can start storing the next product, and can utilize the back pressure of the injection molding machine to perform pressure maintaining step processing on the product while storing the next product. After the product is processed by the back pressure of the injection molding machine in the pressure maintaining step, the time for independently processing the product in the pressure maintaining step is shortened, the process period of the injection molding product is further shortened, and the processing efficiency is improved.
The back pressure of the injection molding machine is required to be increased because the back pressure is generally lower, generally 5-15Mpa, and the pressure required when the product is processed in the pressure maintaining step is generally overlarge, generally 40-45Mpa, in the process of storing the product by the injection molding machine, and the back pressure increased by the injection molding machine is used for synchronously processing the product processed in the cooling step.
The injection molding can be divided into a valve needle type sprue and a large water gap sprue according to whether a valve needle for controlling the communication or the separation between the injection molding machine and the sprue is arranged in the injection molding machine. The valve needle type sprue is internally provided with a valve needle which can control the sprue to be communicated with or separated from the injection molding machine. And a large water gap gate which is always connected with the injection molding machine. Because of the existence of a large water gap sprue, namely the condition that the injection molding machine is always connected with the sprue, the backpressure generated by the injection molding machine can always act on a product. Therefore, the above-mentioned processing method using increased back pressure to simultaneously perform the pressure maintaining step on the product processed in the cooling step is particularly suitable for a gate with a large gate. When the connection mode between the runner of the injection molding machine and the sprue of the product is a large water gap sprue, the injection molding machine in the storage can be communicated with the product, so that the backpressure of the injection molding machine can be increased during storage to perform pressure maintaining processing on the sprue of the product.
In the injection molding process provided by this embodiment, the pressure maintaining step includes the following three stages:
the first stage, pressure maintaining and releasing to prevent mold expansion;
the second stage, the main body is maintained, and the deformation of the large surface of the product is prevented;
and in the third stage, maintaining the pressure of the pouring gate to prevent the position of the pouring gate from being deformed.
The pressure maintaining steps in the three stages are reasonable in design, so that the large size and the accurate processing of the main body of the product can be guaranteed, and the accurate processing of a pouring gate of the product can also be guaranteed. The gate of the product with thicker wall thickness is particularly easy to deform, and the gate is generally ensured not to deform by adding the step operation of the third stage in the pressure maintaining step at present, so that the time length of the pressure maintaining step is prolonged.
Wherein, because runner and injection molding machine are linked together all the time, so can adjust big backpressure when the injection molding machine storage, utilize the backpressure of adjusting big to carry out the processing of pressurize to the runner. As shown in fig. 2, namely, the product processed by the cooling step is synchronously processed by the pressure maintaining step of the third stage by using the back pressure increased by the injection molding machine, while the processing of the first stage and the second stage in the pressure maintaining step still needs to be performed according to the general injection molding process sequence, and the injection molding process comprises the steps of storing, injecting, maintaining pressure, cooling, opening the mold and the like, so when the processing is performed according to the process sequence, the first stage and the second stage in the pressure maintaining step need to be performed normally between the injecting step and the cooling step. The injection molding process provided by the embodiment can utilize the injection molding machine to perform the processing of the third stage in the pressure maintaining step in the process of performing the processing of the material storing step, and the processing time of the third stage in the pressure maintaining step can be saved in the whole cycle of the injection molding process, so that the cycle of the injection molding process is shortened, and the time is saved more.
Example 2
The present embodiment provides an injection molding process based on the above embodiments. Because the machine table of the injection molding machine can be manually set with a plurality of different processing stages, and the parameters of the different processing stages can be set automatically. The machine table of accessible injection molding machine divides the storage processing step into a plurality of different stages artificially to can give different back pressure values for different stages, can set for different storage step processing stages according to the needs of different back pressure values artificially.
In the above embodiments, it can be seen that the injection molding machine should have a time to adjust the back pressure and perform the third stage process on the gate during the process of performing the material storing step. When the material is normally stored and processed, the required back pressure is small, and if the back pressure is set to be large, the material can be damaged. Therefore, as shown in fig. 3, the process of performing the stock step may be subjected to at least the following two stages in sequence:
the back pressure increasing stage controls the injection molding machine to increase the back pressure for storing
In the normal back pressure stage, controlling the injection molding machine to store materials at a normal back pressure value;
the back pressure increasing stage is used for synchronously performing pressure maintaining step processing of the third stage on the product processed in the cooling step by utilizing the back pressure; and in the normal back pressure stage, the back pressure value is adjusted to 5-15Mpa which is commonly used when the material is stored, and the material is processed in a normal material storage step. The injection molding process provided by the embodiment enables different processing stages to be set according to different backpressure values when the product is processed in the material storage step. So that the product carries out the storage step and adds man-hour, not only can utilize earlier the backpressure that adjusts big to carry out the operation of pressurize to the runner of product, carry out storage processing to the material simultaneously, can also adjust back normal backpressure value and carry out the operation of storage to the material.
From the above, the injection molding machine also performs the material storage process at the same time in the back pressure increasing stage of the material storage process, and if the back pressure is adjusted too much in this stage, the material may be damaged. Therefore, the embodiment provides a backpressure increasing stage, and the backpressure of the injection molding machine does not exceed the limit value for damaging the melt structure; preferably, the back pressure value of the injection molding machine in the back pressure increasing stage is 3-5 times of the back pressure value in the positive production back pressure stage, wherein the back pressure value in the back pressure increasing stage is P1, and the back pressure value in the normal back pressure stage is P2, namely P1 is 3-5 times of P2; further preferably, the limit value is 45 MPa. And the back pressure increasing stage should last for a period equal to the period of the third stage of the dwell step process. This avoids damage to the material that might otherwise occur if the material were stored at a high back pressure for an extended period of time. In the back pressure increasing stage in the processing stage of the material storing step of the injection molding machine, the back pressure value and the duration are both set reasonably, and the damage to the material is avoided.
Specifically, during the back pressure increasing stage and the pressure maintaining step processing in the third stage, the injection molding machine is controlled to slowly push the melted material into the shrinkage-prone area of the sprue by using the increased back pressure. The injection molding machine can adjust the position of the stored material, adjust the back pressure value and control the speed of the output material. During the pressure maintaining step in the third stage, the gate may shrink and deform, and in order to ensure the processing accuracy of the gate, the position of the gate, which is easy to shrink, needs to be supplemented, so as to prevent the gate from collapsing after shrinking. Therefore, the embodiment proposes that the storage position of the injection molding machine is aligned with the sprue, and the molten material is slowly pushed into the shrinkage-prone area of the sprue through the increased back pressure, so that the sprue position can be ensured not to shrink.
In the conventional injection molding process, the pressure maintaining step is processed after storage and injection, so that the pressure maintaining in a wall thickness area cannot be stably controlled due to certain pressure change when the injection molding machine is switched between a normal pressure maintaining step and a storage step, and the problem of shrinkage of an injection molding product is difficult to solve. And as described above, the sequential processing according to the normal injection molding process results in a long processing cycle of injection molding. The injection molding process provided by the embodiment not only can be used for processing the next product in the storage step while cooling, but also can be used for processing the sprue of the product in the storage process for pressure maintaining, thereby greatly shortening the injection molding process period and saving time. In addition, according to the injection molding process provided by the embodiment, when the pressure maintaining operation is performed on the sprue, the material storage position can be adjusted by using the injection molding machine, the effect of timely supplementing material to the shrinkage position of the sprue is achieved, and the phenomenon that the sprue shrinks is avoided.
Example 3
The present embodiment provides an injection molding process based on the above embodiments. The injection molding process provided by the embodiment mainly comprises the step of adjusting the back pressure of the injection molding machine during the material storage step. As described in the above embodiments, the material storing step performed by the injection molding machine may be divided into a back pressure increasing stage and a normal back pressure stage, and the back pressure value of the back pressure increasing stage is greater than that of the normal back pressure stage. In order to realize the grading of the injection molding machine material storage step, the setting can be carried out through a software interface of a machine table of the injection molding machine. The software interface of the machine table of the injection molding machine comprises a task creation interface capable of setting a material storage stage, a plurality of material storage tasks can be created in the task creation interface, and different material storage tasks correspond to different material storage stages. For example, at least two material storing tasks should be created, and the tasks are divided into a first material storing task and a second material storing task according to the sequence of execution time, wherein the first material storing task corresponds to the backpressure increasing stage in the material storing step, and the second material storing task corresponds to the normal backpressure stage in the material storing step. And the time points of different stock storing tasks and the corresponding time lengths of the different stock storing tasks can be set in the task creating interface.
After the two storage tasks are created, different working parameters corresponding to different storage tasks need to be set, namely different working parameters of a backpressure increasing stage and a normal backpressure stage are set. The software interface of the machine table of the injection molding machine comprises an interface for setting working parameters corresponding to each material storage task. In the working parameter interface for setting the working parameter corresponding to each material storage task, the number of backpressure points needs to be set, and the injection molding machine voltage value and backpressure value corresponding to each backpressure point, and the maximum backpressure value are set. Namely, in the working parameter interface, the maximum backpressure value and a plurality of backpressure points in the backpressure increasing stage and the maximum backpressure value and a plurality of backpressure points in the normal backpressure stage are set. The operation of the injection molding machine can be controlled by setting the number of the backpressure points and the maximum backpressure value.
The embodiment creates at least a back pressure increasing stage and a normal back pressure stage which the injection molding machine needs to experience in the stock step through the task creating stage, and sets when to execute the back pressure increasing stage and the normal back pressure stage, and the time length required by each of the back pressure increasing stage and the normal back pressure stage. And setting back pressure values of a back pressure increasing stage and a normal back pressure stage through a working parameter interface. In other words, the present embodiment can control the injection molding machine to perform the storage processing at the back pressure increasing stage and the normal back pressure stage through the software interface of the machine table of the injection molding machine.
The embodiment can also set the storage position of the injection molding machine through a machine software interface of the injection molding machine, so that the storage position of the injection molding machine is aligned to the sprue of the product in the backpressure increasing stage, the effect of feeding the sprue is achieved, and the sprue is prevented from being deformed due to shrinkage.
Besides the above-mentioned storage processing of backpressure increase stage and normal backpressure stage through the software interface control injection molding machine of board, still can carry out the storage processing of backpressure increase stage and normal backpressure stage through manual mode control injection molding machine. The injection molding machine generally comprises a backpressure valve, and the backpressure valve can be manually adjusted so as to adjust the backpressure. For example, when the injection molding machine needs to execute the back pressure increasing stage in the material storage step, the back pressure value can be increased by manually adjusting the back pressure valve, and the back pressure value can be adjusted back to the normal value by manually adjusting the back pressure valve when the back pressure increasing stage is finished.
The injection molding process provided by the embodiment provides a specific way for controlling the injection molding machine to execute the storage processing of the backpressure increasing stage and the normal backpressure stage through a software interface of a machine station, and also provides a technical scheme for controlling the injection molding machine to execute the backpressure increasing stage and the normal backpressure stage through a manual setting mode. That is, the present embodiment describes in detail how to implement the injection molding process in the above embodiments by using an injection molding machine.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The injection molding process comprises the steps of storing, injecting, maintaining pressure, cooling and opening the mold, and is characterized in that in the process of performing the storing step and the processing on a product, the back pressure of an injection molding machine is increased, and the back pressure increased by the injection molding machine is used for synchronously performing the processing of the maintaining pressure step on the product.
2. An injection molding process according to claim 1, wherein the injection molding machine is always connected with a product gate, and a runner of the injection molding machine is connected with the product gate in a manner of a large water gap gate;
and performing the processing of the gate pressure maintaining step on the product by utilizing the increased back pressure of the injection molding machine.
3. An injection molding process according to claim 2, wherein the pressure holding step comprises the following three stages:
the first stage, pressure maintaining and releasing;
the second stage, the main body is kept pressure;
and in the third stage, keeping the pressure at the pouring gate.
The product is processed by the pressure maintaining step of the third stage by utilizing the back pressure increased by the injection molding machine,
the first and second stages of the pressure holding step are normally performed between the injection step and the cooling step.
4. An injection molding process according to claim 3, wherein the injection molding machine performs the stock step in at least two sequential stages:
the back pressure increasing stage controls the injection molding machine to increase the back pressure for storing
In the normal back pressure stage, controlling the injection molding machine to store materials at a normal back pressure value;
in the back pressure increasing stage, the back pressure of the injection molding machine is increased to perform pressure maintaining step processing on the product in the third stage;
in the normal back pressure stage, adjusting the back pressure of the injection molding machine to a normal value to execute the step of storing the product;
the back pressure value in the back pressure increasing stage is P1, the back pressure value in the normal back pressure stage is P2, and P1 is more than P2.
5. An injection molding process according to claim 4, wherein the back pressure of the injection molding machine during the back pressure increasing stage does not exceed a limit that would damage the melt structure;
preferably, P1 is 3-5 times that of P2;
further preferably, the limit value is 45 MPa.
6. An injection molding process according to claim 5, wherein the back pressure increasing stage is performed simultaneously with the pressure holding step of the third stage, and the injection molding machine is controlled to slowly push the melted material into the shrinkage-prone region of the gate with the increased back pressure.
7. An injection molding process according to any one of claims 4-6, wherein the injection molding machine adjusts the back pressure through a software interface of the machine during the storing step, or manually adjusts the back pressure through a back pressure valve.
8. An injection molding process according to claim 7, wherein when the magnitude of the back pressure is adjusted through a software interface of the machine, the back pressure value and duration of the back pressure increasing stage, and the back pressure value and duration of the normal back pressure stage are inputted into the software interface.
9. An injection molding process as claimed in claim 8, wherein the back pressure value of the back pressure increasing stage and the back pressure value of the normal back pressure stage are adjusted by inputting the maximum back pressure value in the software interface.
10. An injection molding process according to any of claims 1-9, wherein during the processing of any product for the cooling step, the processing of the next product stock step is performed simultaneously with the injection molding machine.
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| CN202110666120.5A CN114030152A (en) | 2021-06-16 | 2021-06-16 | Injection molding process |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01108017A (en) * | 1987-10-22 | 1989-04-25 | Fanuc Ltd | Control of dwelling and metering in injection molding machine |
| CN1460586A (en) * | 2002-05-16 | 2003-12-10 | 住友重机械工业株式会社 | Injection moulding machine control system and control method |
| CN109159392A (en) * | 2018-09-27 | 2019-01-08 | 科控工业自动化设备（上海）有限公司 | A kind of method and control system of moulding mold processing parameters Automatic Optimal |
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- 2021-06-16 CN CN202110666120.5A patent/CN114030152A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01108017A (en) * | 1987-10-22 | 1989-04-25 | Fanuc Ltd | Control of dwelling and metering in injection molding machine |
| CN1460586A (en) * | 2002-05-16 | 2003-12-10 | 住友重机械工业株式会社 | Injection moulding machine control system and control method |
| CN109159392A (en) * | 2018-09-27 | 2019-01-08 | 科控工业自动化设备（上海）有限公司 | A kind of method and control system of moulding mold processing parameters Automatic Optimal |
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Application publication date: 20220211 |