Control method and device of injection molding device, readable medium and program product

Abstract

The invention discloses a control method and device of an injection molding device, a readable medium and a program product. The method comprises the steps that a mold locking force reference value is calculated according to a mold locking force historical record corresponding to a mold; driving a fixing device to apply mold locking force to the mold according to preset pressure parameters so as to clamp and fix the mold; the injection device is controlled to inject injection molding materials into the molding cavity, the current mold clamping force borne by the mold is obtained and recorded according to the mold clamping force sensor, and the current mold clamping force is recorded in a mold clamping force historical record; and if injection molding is completed, the pressure parameter is adjusted according to the current mold clamping force and the mold clamping force reference value, so that the mold clamping force formed between the movable part and the mold is adjusted in the next injection molding process. According to the technical scheme, the influence caused by aging of the injection molding device is avoided, and the mold clamping force is always accurate.

Description

Technical Field

[0001] The present application belongs to the field of injection molding, and specifically relates to a control method, device, readable medium and program product of an injection molding device. Background Art

[0002] During the injection molding process, the injection molding device needs to apply fixed pressure to the mold to overcome the expansion force of the injection molding material in the molding cavity on the mold, resulting in unexpected deformation of the final injection molded product. The pressure applied to the mold is also called the clamping force.

[0003] The clamping force is generally positively correlated with the pressure parameter of the hydraulic device. Generally, a reasonable pressure parameter is tested when making injection molded products to drive the hydraulic device to drive the fixing device to apply a set pressure (i.e., clamping force) to the mold, which can better overcome the expansion force of the injection material in the molding cavity on the mold during the injection molding process, thus ensuring the molding accuracy and quality of the injection molded products.

[0004] However, during the long-term use of the injection molding device, the clamping force will often change due to external reasons such as oil temperature changes, leakage of the hydraulic device, wear of mechanical parts, etc., resulting in lower and lower machine accuracy.

[0005] Therefore, how to avoid the impact of aging of the injection molding device and ensure that the clamping force is always accurate is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The purpose of this application is to avoid the influence caused by the aging of the injection molding device, and to ensure that the clamping force is always accurate, which is currently an urgent problem to be solved.

[0007] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0008] According to one aspect of an embodiment of the present application, a control method for an injection molding device is provided, wherein the injection molding device comprises: A mold, the mold is used to form a molding cavity to accommodate the injected injection material; A fixing device, wherein the fixing device is used to fix the mold; An injection device, the injection device is used to inject the injection material into the molding cavity; A hydraulic device, the hydraulic device is used to drive the fixing device to clamp and fix the mold; A clamping force sensor, wherein the clamping force sensor is used to obtain the clamping force, wherein the clamping force refers to the pressure formed between the mold and the fixing device; The control method comprises: Calculating a clamping force reference value according to a clamping force history record corresponding to the mold, wherein the clamping force history record is used to record the clamping force borne by the mold during each injection molding; Driving the fixing device to apply a clamping force to the mold according to a preset pressure parameter to clamp and fix the mold; Controlling the injection device to inject the injection material into the molding cavity, and acquiring and recording the current clamping force borne by the mold according to the clamping force sensor, wherein the current clamping force is recorded in the clamping force history record; If the injection molding is completed, the pressure parameter is adjusted according to the current clamping force and the clamping force reference value to adjust the clamping force formed between the fixture and the mold in the next injection molding process.

[0009] According to one aspect of an embodiment of the present application, calculating a clamping force reference value according to a clamping force history record corresponding to the mold includes: According to the recording time of each clamping force, the first N clamping force records are used as target records, where N is a natural number greater than zero; The average value of the target record is used as the clamping force reference value.

[0010] According to one aspect of an embodiment of the present application, adjusting the pressure parameter according to the current clamping force and the clamping force reference value includes: Calculating the difference between the current clamping force and the clamping force reference value as an error value, and if the absolute value of the error value is greater than an error threshold, adjusting the pressure parameter according to the error value; If the absolute value of the error value is smaller than the error threshold, the pressure parameter is maintained.

[0011] According to one aspect of an embodiment of the present application, the difference between the current clamping force and the clamping force reference value is calculated as an error value, and if the absolute value of the error value is greater than an error threshold, the pressure parameter is adjusted according to the error value, including: According to the clamping force history record, the clamping force applied to the mold during the last injection molding process is obtained and the last error value is calculated; If the difference between the previous error value and the current error value is less than the set value, the pressure parameter is adjusted according to the error value; If the difference between the previous error value and the current error value is greater than the set value, the injection molding device is controlled to stop running and an alarm message is issued to indicate that the injection molding device has a fault.

[0012] According to one aspect of an embodiment of the present application, adjusting the pressure parameter according to the error value includes: If the error value is a positive number, reducing the pressure parameter according to a preset adjustment value corresponding to the error value; If the error value is a negative number, the pressure parameter is increased according to a preset adjustment value corresponding to the error value.

[0013] According to one aspect of an embodiment of the present application, adjusting the pressure parameter according to the error value further includes: The ratio of the clamping force reference value to the current clamping force is used as an adjustment coefficient; The product of the pressure parameter and the adjustment coefficient is used as the adjusted pressure parameter.

[0014] According to one aspect of the embodiment of the present application, before calculating the clamping force reference value according to the clamping force history record corresponding to the mold, the method further includes: If the number of clamping force records in the clamping force history record is less than the quantity threshold, the pressure parameter is maintained after completing this injection molding.

[0015] According to one aspect of an embodiment of the present application, the present application provides an injection molding device, including a memory, a processor, and a readable program stored in the memory, wherein the processor executes the readable program to implement any of the methods described above.

[0016] According to one aspect of an embodiment of the present application, a readable storage medium is provided, on which a readable program / instruction is stored. When the readable program / instruction is executed by a processor, any of the methods described above is implemented.

[0017] According to one aspect of an embodiment of the present application, a program product is provided, including a readable program / instruction, and when the readable program / instruction is executed by a processor, any of the methods described above is implemented.

[0018] In the technical solution provided in the embodiment of the present application, the clamping force reference value is first calculated according to the clamping force history record corresponding to the mold, and the clamping force history record is used to record the clamping force that the mold bears each time it is injected. According to the preset pressure parameters, the fixing device is driven to apply the clamping force to the mold to clamp and fix the mold, and the injection device is controlled to inject the injection material into the molding cavity, and the current clamping force borne by the mold is obtained and recorded according to the clamping force sensor, and the current clamping force is recorded in the clamping force history record. If the injection is completed, the pressure parameter is adjusted according to the current clamping force and the clamping force reference value to adjust the clamping force formed between the moving part and the mold in the next injection process. In the above manner, each time the injection is performed, the pressure parameter can be verified according to the actual clamping force borne by the mold to verify whether it can continue to be used in the next injection. If it cannot be used, the pressure parameter is adjusted according to the verification result, so that the precision and quality of the injection molded product during the next injection. It is ensured that the clamping force will not change due to the aging of the injection molding device and always remain accurate.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A flow chart of a control method for an injection molding device according to an embodiment of the present application is shown.

[0022] Figure 2 A flow chart of calculating a clamping force reference value based on a clamping force history record corresponding to a mold according to one embodiment of the present application is shown.

[0023] Figure 3 A flow chart of adjusting pressure parameters according to the current clamping force and the clamping force reference value according to one embodiment of the present application is shown.

[0024] Figure 4 A flowchart is shown in which the difference between the current clamping force and the clamping force reference value is calculated as an error value according to an embodiment of the present application, and if the absolute value of the error value is greater than the error threshold, the pressure parameter is adjusted according to the error value.

[0025] Figure 5 A flow chart of adjusting pressure parameters according to an error value according to an embodiment of the present application is shown.

[0026] Figure 6 A flow chart of adjusting the pressure parameter according to an error value according to another embodiment of the present application is shown.

[0027] Figure 7 The schematic diagram shows a computer system structure block diagram suitable for implementing the injection molding device of the embodiment of the present application. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0029] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0030] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0031] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0032] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories), or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0033] It is understandable that in the specific implementation of this application, relevant data such as customer information is involved. When the above embodiments of this application are applied to specific products or technologies, customer permission or consent is required, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0034] At present, the injection molding device needs to apply fixed pressure to the mold during the injection molding process to overcome the expansion force of the injection molding material in the molding cavity on the mold, resulting in unexpected deformation of the final injection molded product. The pressure applied to the mold during the injection molding process is also called the clamping force.

[0035] The clamping force is generally positively correlated with the pressure parameter of the hydraulic device. Generally, a reasonable pressure parameter is tested when making injection molded products to drive the hydraulic device to drive the fixing device to apply a set pressure (i.e., clamping force) to the mold, so as to better overcome the expansion force of the injection material in the molding cavity on the mold, thereby ensuring the molding accuracy and quality of the injection molded products.

[0036] However, during the long-term use of the injection molding device, due to external reasons such as oil temperature changes, leakage of hydraulic devices, wear of mechanical parts, etc., the clamping force will often change to a certain extent (also called offset) when the pressure parameters remain unchanged, resulting in lower and lower machine accuracy.

[0037] Based on the above problems, the clamping force can only be achieved by constantly changing the pressure parameters according to the real-time changes of the clamping force. The present application proposes a control method for an injection molding device, which can avoid the clamping force error caused by the aging of the injection molding device, that is, avoid abnormal attenuation or abnormal growth of the clamping force between the fixing device and the mold. It should be clarified that in the present application, the pressure formed between the fixing device and the mold is also referred to as the clamping force, which is used to overcome the expansion force of the injection molding material in the molding cavity on the mold. The implementation process of the technical solution of the present application will be explained with specific examples below.

[0038] Figure 1 A flow chart of a control method of an injection molding device according to an embodiment of the present application is shown. The present application embodiment provides a control step of an injection molding device, including: Step S110, calculating a clamping force reference value according to a clamping force history record corresponding to the mold, where the clamping force history record is used to record the clamping force that the mold is subjected to during each injection molding; Step S120, driving the fixing device to apply a clamping force to the mold according to a preset pressure parameter, so as to clamp and fix the mold; Step S130, controlling the injection device to inject the injection material into the molding cavity, and obtaining and recording the current clamping force borne by the mold according to the clamping force sensor, and the current clamping force is recorded in the clamping force history record; Step S140, if the injection molding is completed, the pressure parameter is adjusted according to the current clamping force and the clamping force reference value to adjust the clamping force formed between the fixture and the mold in the next injection molding process.

[0039] The above four steps are described in detail below.

[0040] Before describing the above four steps, it should be made clear that the injection molding device includes a mold, a fixture, an injection device, a hydraulic device, and a clamping force sensor. Among them, the mold is used to form a molding cavity to accommodate the injected injection material. The fixture is used to fix the mold. The injection device is used to inject the injection material into the molding cavity. The hydraulic device is used to drive the fixture to clamp and fix the mold. The clamping force sensor is used to monitor the clamping force formed between the mold and the fixture.

[0041] In some embodiments, the fixing device includes a fixed part and a moving part, and the fixed part is fixedly arranged on the frame of the injection molding device. The moving part is movably arranged on the track of the injection molding device. So that molds of different sizes can be placed between the moving part and the fixed part. The mold includes a moving part and a fixed part, the moving part is fixedly connected to the moving part, and moves with the movement of the moving part, and the fixed part is fixedly connected to the fixed part. The fixed part and the moving part of the mold are both provided with corresponding connection structures. When the moving part and the fixed part are combined, the moving part and the fixed part can be connected to form a shaping cavity. It is used to accommodate the injected injection molding material to form the injection molding product required by the user.

[0042] In some embodiments, the hydraulic device is connected to the moving member, and the hydraulic device can apply forces in different directions to the moving member so that the moving member can move along the track toward or away from the fixed member.

[0043] During the injection molding process, after the mold is installed, the hydraulic device drives the moving part to move toward the fixed part, so that the moving part and the fixed part of the mold are tightly combined to form an injection cavity. At the same time, the hydraulic device drives the moving part to apply a clamping force to the moving part according to the preset pressure parameters. The force is conductive, and the pressure generated between the moving part and the moving part is the same as the clamping force between the moving part and the fixed part, which is used to prevent the moving part and the fixed part from expanding due to the expansion force of the injection material in the molding cavity on the mold, resulting in injection failure.

[0044] Then, the mold is cooled and formed, and the hydraulic device is driven to drive the movable part away from the fixed part. The movable part moves with the movement of the movable part, and the movable part is separated from the fixed part, separating the injection molded product from the mold to obtain the injection molded product.

[0045] In the above-mentioned injection molding process, the following steps are always used to adjust the pressure parameters, thereby achieving the technical effect of adjusting the clamping force (that is, the pressure between the fixture and the mold) so that the clamping force can always meet the injection molding requirements.

[0046] Finally, it should be made clear that the size of the pressure parameter is positively correlated with the size of the clamping force.

[0047] In step S110, before the hydraulic device is driven to drive the actuator to apply the clamping force to the mold, the clamping force history record corresponding to the current mold is obtained to calculate the clamping force reference value according to the clamping force history record. The clamping force history record is used to record the clamping force that the mold is subjected to each time injection molding. The clamping force reference value refers to the clamping force value that can meet the injection molding requirements and will not cause accelerated aging of the injection molding device.

[0048] It should be clear that the clamping force history record can exist in any form, such as a record table or a database. On the other hand, different molds may require different clamping forces to complete injection molding, so different molds have corresponding clamping force history records.

[0049] Since the pressure parameters are adjusted when the injection molding device is used for injection molding at the beginning, and are based on the state of the injection molding device itself, the clamping force applied by the hydraulic device to the mold according to the pressure parameters is accurate at the beginning. That is to say, part or all of the clamping force in the clamping force history record is relatively accurate, and will not be too small to cause defects in the product, nor too large to cause damage to the injection molding device. That is to say, there is a reasonable clamping force in the clamping force history record, based on which, the clamping force reference value can be calculated based on the clamping force history record.

[0050] The clamping force reference value is used as a standard to provide a reference for the actual clamping force obtained by the subsequent pressure sensor. If the current clamping force obtained by the pressure sensor is significantly different from the clamping force reference value, it means that with the increase in the number of injections, the previously set pressure parameters are no longer suitable for the current injection molding device, and the pressure parameters need to be adjusted to readjust the clamping force to a value close to the clamping force reference value. This ensures the quality of the injection molded product and avoids excessive clamping force that accelerates the aging of the injection molding device.

[0051] See also Figure 2 , Figure 2 A flowchart of calculating a clamping force reference value according to a clamping force history record corresponding to a mold according to an embodiment of the present application is shown. The present application embodiment provides a step S110 of calculating a clamping force reference value according to a clamping force history record corresponding to a mold, comprising: Step S111, according to the recording time of each clamping force, the first N clamping force records are used as target records, where N is a natural number greater than zero; Step S112, taking the average value of the target record as a reference value of the clamping force.

[0052] The above two steps are described in detail below.

[0053] In step S111, each clamping force record has a corresponding recording time. The higher the ranking, the earlier the time of recording the clamping force. The clamping force records ranked in the first N are taken as the target records. It is necessary to specify that N is a natural number greater than zero, that is, N is at least 1.

[0054] In step S112, the average value of the clamping force in the target record is used as a reference value of the clamping force.

[0055] In some embodiments, N is 3, that is, the clamping force used in the first three injection moldings of the mold is recorded as the target, and the average of these three clamping forces is used as the reference value of the clamping force.

[0056] In some embodiments, based on the principle that the clamping force decreases as the number of times the injection molding device is used increases, the following method can also be used to calculate the reference value of the clamping force.

[0057] The experimental pressure parameters are preset for the injection molding device, the injection molding of the injection molding device is controlled, and the clamping force during each injection molding process is recorded to form a clamping force history record.

[0058] In some embodiments, if the initially set preset experimental pressure parameter causes defects in the injection molded product, the experimental pressure parameter is increased until the experimental pressure parameter does not cause defects in the injection molded product. Only the maximum experimental pressure parameter is retained as the only experimental pressure parameter. Then, the injection molding device is controlled to perform injection molding according to the experimental pressure parameter, and the clamping force during each injection molding process is recorded to form a clamping force history record.

[0059] In some embodiments, after the first injection, the experimental pressure parameter is decreased according to the set value each time the injection is performed to achieve the effect of gradually decreasing the clamping force. Until it is determined according to the instruction information that the injection molded product has a defect due to insufficient clamping force, the magnitude of the clamping force when the injection molded product has a defect is used as the error clamping force, and the clamping force history record is obtained according to the injection molding record.

[0060] If a historical clamping force less than the error clamping force appears in the clamping force history record, a fault alarm is issued to remind the user that the injection molding device is faulty. Because the historical clamping force less than the error clamping force does not cause defects in the injection molded product (generally speaking, only when the clamping force is too small will the injection molded product be defective), but the error clamping force will cause defects in the injection molded product. At this time, it may be that the injection molding device is faulty, such as the alignment deviation between the fixed part and the moving part of the mold. Therefore, the user is reminded that the injection molding device is faulty. In some embodiments, it is directly prompted that the mold is faulty.

[0061] If there is no historical clamping force less than the error clamping force in the clamping force history record, the historical clamping force closest to the error clamping force will be used as the clamping force reference value. This is because the historical clamping force closest to the error clamping force will not cause defects in the injection molded product, and is the smallest among all historical clamping forces, causing the least damage to the injection molding device, so it is most appropriate to use it as the clamping force reference value.

[0062] In this way, the user can get the most appropriate clamping force reference value without calculating the pressure parameters, and the accuracy is far higher than the user's calculation result. This clamping force reference value can minimize the damage to the injection molding device while ensuring that the injection molded product does not have defects.

[0063] In some embodiments, if the number of clamping force records in the clamping force history record is less than the quantity threshold, the pressure parameters are maintained after the current injection molding is completed, that is, the pressure parameters used this time are also used in the next injection molding without adjustment.

[0064] In step S120, the fixing device is driven to apply a clamping force to the mold according to preset pressure parameters to clamp and fix the mold.

[0065] In step S130, the injection device is controlled to inject the injection material into the molding cavity. At the same time, the current clamping force borne by the mold is obtained and recorded according to the clamping force sensor, and the current clamping force is recorded in the clamping force history record.

[0066] In step S140, if the injection molding is completed, the pressure parameters are adjusted according to the current clamping force and the clamping force reference value to adjust the clamping force formed between the moving part and the mold in the next injection molding process. If the current clamping force is less than the clamping force reference value, it means that the pressure parameter used is too small, and the pressure parameter needs to be increased to increase the clamping force during the next injection molding to avoid defects in the injection molded product. If the current clamping force is greater than the clamping force reference value, it means that the pressure parameter used is too large, and the pressure parameter needs to be lowered to reduce the clamping force during the next injection molding to avoid accelerated aging of the injection molding device due to excessive clamping force.

[0067] See also Figure 3 , Figure 3 A flow chart of adjusting pressure parameters according to the current clamping force and the clamping force reference value according to an embodiment of the present application is shown. The present application embodiment provides a step S140 of adjusting pressure parameters according to the current clamping force and the clamping force reference value, including: Step S141, calculating the difference between the current clamping force and the clamping force reference value as an error value, and if the absolute value of the error value is greater than the error threshold, adjusting the pressure parameter according to the error value; Step S142: if the absolute value of the error value is less than the error threshold, the pressure parameter is maintained.

[0068] The above two steps are described in detail below.

[0069] In step S141, the difference between the current clamping force and the clamping force reference value is taken as an error value. If the absolute value of the error value is greater than the error threshold, the pressure parameter is adjusted according to the error value.

[0070] In step S142, if the absolute value of the error value is less than the error threshold, the pressure parameter is maintained.

[0071] That is, the pressure parameters will be adjusted only when the error between the current clamping force and the clamping force reference value is greater than a certain level. This prevents the pressure parameters from being modified when the current clamping force fluctuates slightly, thereby avoiding frequent modifications to the pressure parameters and saving computer resources.

[0072] See also Figure 4 , Figure 4 The present invention provides a flow chart of calculating the difference between the current clamping force and the clamping force reference value as an error value, and adjusting the pressure parameter according to the error value if the absolute value of the error value is greater than the error threshold value according to an embodiment of the present invention. The present invention provides a step S141 of calculating the difference between the current clamping force and the clamping force reference value as an error value, and adjusting the pressure parameter according to the error value if the absolute value of the error value is greater than the error threshold value, including: Step S201, obtaining the clamping force applied to the mold during the last injection molding process and calculating the last error value according to the clamping force history record; Step S202, if the difference between the previous error value and the current error value is less than the set value, the pressure parameter is adjusted according to the error value; Step S203: if the difference between the previous error value and the current error value is greater than a set value, the injection molding device is controlled to stop running and an alarm message is issued to indicate that a failure has occurred in the injection molding device.

[0073] The above three steps are described in detail below.

[0074] In step S201, according to the clamping force history record, the clamping force applied to the mold during the last injection molding process is obtained and the last error value is calculated.

[0075] In step S202, if the difference between the previous error value and the current error value is less than the set value, the pressure parameter is adjusted according to the error value. This indicates that the error value changes slowly between two adjacent injection processes, which is a normal phenomenon caused by the aging of the injection molding device.

[0076] In step S203, if the difference between the previous error value and the current error value is greater than the set value, an alarm message is issued to indicate that the injection molding device has failed. This indicates that the error value changes dramatically between two adjacent injection molding processes, which is an abnormal phenomenon caused by the rapid aging of the injection molding device. It may be that the fatigue value of the injection molding device components has reached its peak and the components are damaged. It may also be that the injection molding device has failed. However, in either case, it is necessary to stop the injection molding and issue an alarm message to indicate that the injection molding device has failed.

[0077] In the embodiment of the present application, when the pressure parameters need to be adjusted, two adjacent error value pairs are used for detection, so that a failure of the injection molding device can be discovered in time.

[0078] See also Figure 5 , Figure 5 A flow chart of adjusting a pressure parameter according to an error value according to an embodiment of the present application is shown. The steps of adjusting a pressure parameter according to an error value provided in the embodiment of the present application include: Step S301, if the error value is a positive number, the pressure parameter is reduced according to a preset adjustment value corresponding to the error value; Step S302: if the error value is a negative number, the pressure parameter is increased according to a preset adjustment value corresponding to the error value.

[0079] The above two steps are described in detail below.

[0080] In step S301, when the error value is a positive number, it means that the current clamping force is too large. Since the pressure parameter is positively correlated with the clamping force, the pressure parameter is correspondingly reduced so that the modified pressure parameter during the next injection can make the clamping force approximate the clamping force reference value again.

[0081] In step S302, when the error value is a negative number, it means that the current clamping force is too small. Since the pressure parameter is positively correlated with the clamping force, the pressure parameter is increased accordingly so that the modified pressure parameter during the next injection can make the clamping force approximate the clamping force reference value again.

[0082] In some embodiments, according to the size of the error value, an adjustment parameter corresponding to the error value is obtained, the adjustment parameter has the same sign as the error value, and is positively correlated with the size of the error value. The difference between the adjustment parameter and the current pressure parameter is used as the latest pressure parameter to form a clamping force in a subsequent injection molding process.

[0083] In the embodiment of the present application, automatic adjustment of the clamping force is achieved, so that the clamping force is always close to the magic force reference value, which ensures that the injection molded product will not have defects and will not cause accelerated aging of the device due to excessive clamping force.

[0084] See also Figure 6 , Figure 6 A flow chart of adjusting the pressure parameter according to an error value according to another embodiment of the present application is shown. The step of adjusting the pressure parameter according to the error value provided in the embodiment of the present application includes: Step S401, taking the ratio of the clamping force reference value to the current clamping force as an adjustment coefficient; Step S402: taking the product of the pressure parameter and the adjustment coefficient as the adjusted pressure parameter.

[0085] The above steps are described in detail below.

[0086] In step S401, the ratio of the clamping force reference value to the current clamping force is used as the adjustment coefficient, which makes the adjustment coefficient a dynamic value that can meet various situations.

[0087] In step S402, the product of the pressure parameter and the adjustment coefficient is used as the adjusted pressure parameter. When the clamping force reference value is greater than the current clamping force, that is, the current clamping force is small, the pressure parameter needs to be increased. At this time, the adjustment coefficient is greater than 1, and the pressure parameter can be increased by multiplying the adjustment coefficient by the pressure parameter. At the same time, according to the difference in size between the current clamping force and the clamping force reference value, the adjustment coefficient naturally increases or decreases to a corresponding degree, and the pressure parameter can be increased to a corresponding degree. The larger the clamping force reference value is than the current clamping force, the larger the adjustment coefficient is, and the larger the pressure parameter becomes. Automatic adjustment of the pressure parameter is achieved.

[0088] Similarly, when the clamping force reference value is less than the current clamping force, that is, the current clamping force is large, the pressure parameter needs to be reduced. At this time, the adjustment coefficient is less than 1, and the pressure parameter can be reduced by multiplying the adjustment coefficient by the pressure parameter. At the same time, according to the difference between the current clamping force and the clamping force reference value, the adjustment coefficient will naturally increase or decrease to a corresponding degree, and the pressure parameter can be reduced to a corresponding degree. The smaller the clamping force reference value is than the current clamping force, the smaller the adjustment coefficient is, and the smaller the pressure parameter becomes.

[0089] Figure 7 The block diagram schematically shows a computer system structure for implementing the injection molding device of the embodiment of the present application.

[0090] It should be noted that Figure 7 The computer system 800 of the injection molding device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0091] like Figure 7As shown, the computer system 800 includes a central processing unit 801 (CPU), which can perform various appropriate actions and processes according to the program stored in the read-only memory 802 (ROM) or the program loaded from the storage part 808 to the random access memory 803 (RAM). Various programs and data required for system operation are also stored in the random access memory 803. The central processing unit 801, the read-only memory 802 and the random access memory 803 are connected to each other through a bus 804. The input / output interface 805 (Input / Output interface, i.e., I / O interface) is also connected to the bus 804.

[0092] The following components are connected to the input / output interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN card, a modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the input / output interface 805 as needed. A removable medium 811, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 810 as needed so that a computer program read therefrom is installed into the storage section 808 as needed.

[0093] In particular, according to an embodiment of the present application, the process described in each method flow chart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer readable medium, and the computer program contains a program code for executing the method shown in the flow chart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 809, and / or installed from the removable medium 811. When the computer program is executed by the central processor 801, various functions defined in the system of the present application are executed.

[0094] It should be noted that the computer-readable medium shown in the embodiment of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0095] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the above-mentioned module, program segment or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0096] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0097] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software, or by combining software with necessary hardware. Therefore, the technical solution according to the implementation method of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation method of the present application.

[0098] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.

[0099] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A control method for an injection molding device, characterized in that: The injection molding device comprises: A mold, the mold is used to form a molding cavity to accommodate the injected injection material; A fixing device, wherein the fixing device is used to fix the mold; An injection device, the injection device is used to inject the injection material into the molding cavity; A hydraulic device, the hydraulic device is used to drive the fixing device to clamp and fix the mold; A clamping force sensor, wherein the clamping force sensor is used to obtain the clamping force, wherein the clamping force refers to the pressure formed between the mold and the fixing device; The control method comprises: Calculating a clamping force reference value according to a clamping force history record corresponding to the mold, wherein the clamping force history record is used to record the clamping force borne by the mold during each injection molding; Driving the fixing device to apply a clamping force to the mold according to a preset pressure parameter to clamp and fix the mold; Controlling the injection device to inject the injection material into the molding cavity, and acquiring and recording the current clamping force borne by the mold according to the clamping force sensor, wherein the current clamping force is recorded in the clamping force history record; If the injection molding is completed, the pressure parameter is adjusted according to the current clamping force and the clamping force reference value to adjust the clamping force formed between the fixture and the mold in the next injection molding process.

2. The method according to claim 1, characterized in that The clamping force reference value is calculated based on the clamping force history record corresponding to the mold, including: According to the recording time of each clamping force, the first N clamping force records are used as target records, where N is a natural number greater than zero; The average value of the target record is used as the clamping force reference value.

3. The method according to claim 1, characterized in that Adjusting the pressure parameter according to the current clamping force and the clamping force reference value includes: Calculating the difference between the current clamping force and the clamping force reference value as an error value, and if the absolute value of the error value is greater than an error threshold, adjusting the pressure parameter according to the error value; If the absolute value of the error value is smaller than the error threshold, the pressure parameter is maintained.

4. The method according to claim 3, characterized in that Calculating the difference between the current clamping force and the clamping force reference value as an error value, and if the absolute value of the error value is greater than an error threshold, adjusting the pressure parameter according to the error value, including: According to the clamping force history record, the clamping force applied to the mold during the last injection molding process is obtained and the last error value is calculated; If the difference between the previous error value and the current error value is less than the set value, the pressure parameter is adjusted according to the error value; If the difference between the previous error value and the current error value is greater than the set value, the injection molding device is controlled to stop running and an alarm message is issued to indicate that the injection molding device has a fault.

5. The method according to claim 3 or 4, characterized in that: Adjusting the pressure parameter according to the error value includes: If the error value is a positive number, reducing the pressure parameter according to a preset adjustment value corresponding to the error value; If the error value is a negative number, the pressure parameter is increased according to a preset adjustment value corresponding to the error value.

6. The method according to claim 3, characterized in that Adjusting the pressure parameter according to the error value further includes: The ratio of the clamping force reference value to the current clamping force is used as an adjustment coefficient; The product of the pressure parameter and the adjustment coefficient is used as the adjusted pressure parameter.

7. The method according to claim 1, characterized in that Before calculating the clamping force reference value according to the clamping force history records corresponding to the mold, the method further includes: If the number of clamping force records in the clamping force history record is less than the quantity threshold, the pressure parameter is maintained after completing this injection molding.

8. An injection molding device, comprising a memory, a processor, and a readable program stored in the memory, characterized in that: The processor executes the readable program to implement the method according to any one of claims 1 to 7.

9. A readable storage medium, characterized in that: A readable program / instruction is stored thereon, and when the readable program / instruction is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

10. A program product, comprising a readable program / instruction, characterized in that: When the readable program / instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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