Mold shifting control method and related device for two-platen injection molding machine

Abstract

The present invention discloses a mold shift control method and related device for a two-plate injection molding machine, which relates to the technical field of injection molding equipment. The method includes: when the current position of the movable platen in the two-plate injection molding machine is within the target deceleration position range, obtaining the mold shift calculation speed corresponding to the current position of the movable platen according to the current position of the movable platen and the maximum rated deceleration; when the mold shift calculation speed corresponding to the current position of the movable platen is less than or equal to the mold shift setting speed corresponding to the current position of the movable platen, controlling the opening of the mold shift proportional valve in the two-plate injection molding machine according to the mold shift calculation speed; when the mold shift calculation speed is greater than the mold shift setting speed, controlling the opening of the mold shift proportional valve in the two-plate injection molding machine according to the mold shift setting speed. In this way, the movable platen in the two-plate injection molding machine can be accurately locked at the mold shift end position.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding equipment, and in particular to a mold shifting control method and related devices of a two-platen injection molding machine. Background Art

[0002] An injection molding machine is a primary molding device that uses plastic molds to create various shapes from thermoplastics or thermosetting plastics. The injection molding machine's workflow involves mold closing and mold opening. The purpose of mold closing is to tightly close the movable and static mold plates to form a closed molding space. Mold opening is generally the next step after mold closing, separating the movable and static mold plates to facilitate molded part removal. Both mold closing and mold opening operations are referred to as mold removal.

[0003] During mold shifting, the moving platen typically undergoes deceleration and braking. To reduce frictional resistance, some injection molding machines typically use linear guides with lower frictional resistance as the moving platen's guide rails. Therefore, when deceleration and braking are required during mold opening, the reduced frictional resistance prevents the moving platen from decelerating smoothly. This can cause the moving platen's final resting position to shift, and excessive platen shift deviation can prevent the robot from removing the molded part, leading to a malfunction. Furthermore, during mold opening, the braking force is entirely provided by the clamping cavity. The clamping cavity of a two-plate injection molding machine is a rod-type cavity with a small oil pressure area, requiring only high back pressure to provide braking force. This requires reducing the opening of the mold shift proportional valve to provide high back pressure. However, this reduced opening prevents the mold opening cavity from replenishing oil in time. If a vacuum forms in the mold opening cavity, rebound and vibration will occur after the mold is opened, causing the moving platen to shift position. When deceleration and braking are required during mold closing operation, the movable platen cannot stop in time and may close the mold to the bottom and collide with the mold, which may easily cause damage to the mold. In addition, the mold may rebound when it closes to the bottom and cause the brake to fail to engage.

[0004] Therefore, the related art has a technical problem that the movable platen cannot be locked at the end position of the mold shifting. Summary of the Invention

[0005] In order to solve the technical problem in the above-mentioned related art that the movable platen in the two-platen injection molding machine cannot be locked at the mold shifting end position, the purpose of the present invention is to provide a mold shifting control method and related devices for a two-platen injection molding machine.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A first aspect of an embodiment of the present invention provides a mold shifting control method for a two-platen injection molding machine, comprising:

[0008] When the current position of the movable platen in the two-plate injection molding machine is within the target deceleration position range, a calculated mold moving speed corresponding to the current position of the movable platen is obtained according to the current position of the movable platen and the maximum rated deceleration;

[0009] When a calculated mold shift speed corresponding to the current position of the movable platen is less than or equal to a set mold shift speed corresponding to the current position of the movable platen, controlling an opening of a mold shift proportional valve in the two-platen injection molding machine according to the calculated mold shift speed;

[0010] When the calculated mold shift speed is greater than the set mold shift speed, the opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the set mold shift speed.

[0011] In an optional embodiment, the method further comprises:

[0012] When the current position of the movable platen is in the non-deceleration position range, the opening of the mold shifting proportional valve in the two-platen injection molding machine is controlled according to the maximum mold clamping control voltage corresponding to the maximum rated mold shifting speed of the movable platen.

[0013] In an optional embodiment, the method further comprises:

[0014] determining, according to the maximum rated mold shifting speed of the movable platen and the maximum rated deceleration, a minimum deceleration distance required for the movable platen to decelerate from the maximum rated mold shifting speed to zero;

[0015] Determining the target deceleration distance of the moving plate according to the minimum deceleration distance and the set deceleration distance coefficient;

[0016] The non-deceleration position range is determined according to the set mold shifting starting position of the movable platen and the target deceleration distance.

[0017] In an optional embodiment, the method further comprises:

[0018] Obtaining the actual deceleration distance required by the movable platen according to the maximum set mold moving speed of the movable platen within the non-deceleration position range and the maximum rated deceleration of the movable platen;

[0019] According to the actual deceleration distance and the set mold shifting end position, the target deceleration position range corresponding to the movable platen is determined.

[0020] In an optional embodiment, the step of controlling the opening of the mold shift proportional valve in the two-plate injection molding machine according to the calculated mold shift speed includes:

[0021] Calculating a first mold shift control voltage value corresponding to the current position of the movable platen based on the mold shift calculation speed using a pre-constructed linear function;

[0022] The opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the first mold shift control voltage value.

[0023] And / or, the step of controlling the opening of the mold shift proportional valve in the two-platen injection molding machine according to the mold shift setting speed includes:

[0024] Calculating a second mold shift control voltage value corresponding to the current position of the movable platen based on the mold shift setting speed through a pre-constructed linear function;

[0025] The opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the second mold shift control voltage value.

[0026] In an optional embodiment, the linear function includes a closing linear function; and the process of constructing the closing linear function includes:

[0027] The maximum rated mold closing speed of the movable platen is obtained according to the maximum mold closing flow of the two-platen injection molding machine, the cylinder diameter of the mold shifting cylinder assembly in the two-platen injection molding machine, and the diameter of the mold shifting piston rod in the mold shifting cylinder assembly;

[0028] The mold clamping linear function is constructed with the mold clamping speed as the independent variable and the mold clamping control voltage as the dependent variable, according to the maximum rated mold clamping speed and its corresponding maximum mold clamping control voltage, as well as the minimum mold clamping speed and its corresponding minimum mold clamping control voltage; wherein the minimum mold clamping speed is 0.

[0029] In an optional embodiment, the linear function includes a mold opening linear function; and the process of constructing the mold opening linear function includes:

[0030] According to the maximum rated mold opening flow of the two-platen injection molding machine and the diameter of the mold-moving piston rod, the maximum rated mold opening speed of the movable platen is obtained;

[0031] With the mold opening speed as the independent variable and the mold opening control voltage as the dependent variable, the mold opening linear function is constructed according to the maximum rated mold opening speed and its corresponding maximum mold opening control voltage, as well as the minimum mold opening speed and its corresponding minimum mold opening control voltage; wherein the minimum mold opening speed is 0.

[0032] In an optional embodiment, when the mold shift calculation speed is less than or equal to the mold shift setting speed, the method further includes:

[0033] Controlling the mold shifting flow rate of the main oil circuit in the two-plate injection molding machine according to the calculated mold shifting speed;

[0034] And / or, when the mold shift calculation speed is greater than the mold shift setting speed, the method further includes:

[0035] The mold shifting flow rate of the main oil circuit in the two-plate injection molding machine is controlled according to the mold shifting calculation speed.

[0036] In an optional embodiment, the maximum rated deceleration includes a maximum mold closing rated deceleration and / or a maximum mold opening rated deceleration;

[0037] The maximum rated deceleration for mold closing is calculated based on the rated working pressure of the mold shifting cylinder assembly in the two-plate injection molding machine, the cylinder diameter of the mold shifting cylinder assembly, and the mass of the movable platen on which the heaviest mold is installed; and / or, the maximum rated deceleration for mold opening is calculated based on the rated working pressure of the mold shifting cylinder assembly in the two-plate injection molding machine, the cylinder diameter of the mold shifting cylinder assembly, the diameter of the mold shifting piston rod in the mold shifting cylinder assembly, and the mass of the movable platen on which the heaviest mold is installed.

[0038] The second aspect of the embodiments of the present invention further provides a two-plate injection molding machine, comprising a movable platen and a controller; the controller is used to perform mold shifting control on the movable platen through the mold shifting control method of the two-plate injection molding machine provided by any embodiment of the first aspect above.

[0039] The third aspect of the embodiments of the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores machine executable instructions that can be executed by the processor, and the processor is used to execute the machine executable instructions to implement the mold shifting control method of the two-plate injection molding machine provided in any embodiment of the first aspect above.

[0040] In a fourth aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the mold shifting control method of a two-plate injection molding machine provided by any embodiment of the first aspect above is implemented.

[0041] Compared with the prior art, the present invention has at least the following beneficial effects:

[0042] By dividing the target deceleration position range from the position interval that the movable plate passes through during the mold shifting process, and after the movable plate enters the deceleration section (i.e., the target deceleration position range), the corresponding mold shifting calculated speed is calculated in real time based on the current position of the movable plate and the maximum rated deceleration. The calculated mold shifting speed obtained each time is compared with the corresponding mold shifting set speed, and the smallest value is selected to control the opening of the mold shifting proportional valve corresponding to the current position of the movable plate. This not only ensures that the movable plate can eventually stop at the set mold shifting end position in a timely manner regardless of the position it runs to during the deceleration section, but also achieves lower mold shifting flow control in the deceleration section, which is beneficial to reducing energy consumption. In this way, the movable plate can be locked at the set mold shifting end position in a timely and accurate manner, saving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A structural block diagram of an electronic device provided by the present invention;

[0044] Figure 2 A flow chart of a mold shifting control method for a two-platen injection molding machine provided by the present invention;

[0045] Figure 3 A schematic diagram of a process for obtaining a non-deceleration position range provided by the present invention;

[0046] Figure 4 A schematic diagram of a process for obtaining a target deceleration position range provided by the present invention. DETAILED DESCRIPTION

[0047] To facilitate understanding of the present invention, the technical solutions and advantages of the invention are further described in detail below in conjunction with the accompanying drawings and embodiments. Any mechanism or method not described in detail in the present invention may refer to the prior art. The specific structure and features of the present invention are described below by way of example and should not constitute any limitation to the present invention. At the same time, any of the technical features mentioned below (including implicit or disclosed), as well as any technical features directly displayed or implicit in the drawings, can be further combined or deleted between these technical features to form more other embodiments that may not be directly or indirectly mentioned in the present invention. The accompanying drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosure of the present invention.

[0048] The mold transfer control method of the two-plate injection molding machine provided by the present invention can be applied to electronic equipment, please refer to Figure 1 , is a block diagram of the structure of an electronic device. The electronic device 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, processor 120, and communication module 130 are electrically connected to each other, directly or indirectly, to enable data transmission or interaction. For example, these components may be electrically connected to each other via one or more communication buses or signal lines.

[0049] The memory is used to store programs or data. The memory may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), and electrically erasable programmable read-only memory (EEPROM).

[0050] The processor is used to read / write data or programs stored in the memory and execute corresponding functions.

[0051] The communication module is used to establish a communication connection between the electronic device and other communication terminals through the network, and is used to send and receive data through the network.

[0052] It should be understood that Figure 1 The structure shown is only a schematic diagram of the structure of the electronic device, and the electronic device may also include Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown. Figure 1 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0053] In some embodiments, the electronic device can serve as a controller of a two-plate injection molding machine, so that in the process of executing the mold shifting control method of the two-plate injection molding machine provided by an embodiment of the present invention, the movable mold plate can be controlled to be locked in the set mold shifting end position in a timely and accurate manner.

[0054] Based on this, an embodiment of the present invention can also provide a two-plate injection molding machine, which can include a movable platen and a controller; the controller is used to control the mold shifting of the movable platen through the mold shifting control method of the two-plate injection molding machine provided by an embodiment of the present invention.

[0055] The following combination Figure 2 The mold shifting control method of the two-platen injection molding machine provided by the present invention is described. Figure 2 1 is a flow chart of a mold shifting control method for a two-platen injection molding machine provided by the present invention, the mold shifting control method for a two-platen injection molding machine comprising:

[0056] In step S100, when the current position of the movable platen in the two-platen injection molding machine is within the target deceleration position range, a calculated mold shifting speed corresponding to the current position of the movable platen is obtained according to the current position of the movable platen and the maximum rated deceleration;

[0057] In step S200, when a calculated mold shift speed corresponding to the current position of the movable platen is less than or equal to a set mold shift speed corresponding to the current position of the movable platen, an opening of a mold shift proportional valve in the two-platen injection molding machine is controlled according to the calculated mold shift speed;

[0058] In step S300 , when the calculated mold shift speed is greater than the set mold shift speed, the opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the set mold shift speed.

[0059] In order to ensure the efficiency of the mold shifting of the movable platen, and thus the output efficiency of the two-platen injection molding machine, the movable platen can start to decelerate and brake at a certain position, without the need to perform deceleration and braking operations at all positions during the entire mold shifting process. Therefore, a deceleration segment can be selected between the set mold shifting start position and the set mold shifting end position of the movable platen. One of the endpoints of the deceleration segment is between the mold shifting start position and the mold shifting end position, which can be selected based on actual needs or experience, and the other endpoint is the mold shifting end position. In this way, the target deceleration position range can be obtained. Accordingly, the distance between the mold shifting start position and the starting point of the deceleration segment corresponds to the non-deceleration segment, which can also be called the non-deceleration position range.

[0060] Therefore, when the movable platen performs any one of the mold closing and opening operations, in order to ensure that the movable platen can stop at the set mold shifting end position in a timely and accurate manner, the above steps S100 to S300 can be executed.

[0061] During the execution of step S100, the mold transfer calculation speed can be calculated by the formula Calculated, where Indicates the speed of mold transfer calculation, Indicates the distance between the current position of the movable platen and the end position of the mold shifting. Indicates the maximum rated deceleration of the moving plate.

[0062] Among them, the current position of the movable template can be detected by a position detection module, the position detection module can be set on the mold shifting piston rod in the mold shifting cylinder assembly of the two-plate injection molding machine, and the position detection module can be connected to the execution subject for executing the mold shifting control method of the two-plate injection molding machine provided by the present invention to send the detected current position of the movable template to the execution subject.

[0063] As an example, the position detection module may be an electronic ruler, but is not limited thereto.

[0064] However, in some cases, in order to ensure that the motion stability and mold transfer time of the movable platen can meet the requirements or achieve a certain balance, the machine itself or the user may set a deceleration distance coefficient to intervene in the deceleration process of the movable platen. Therefore, in some embodiments, if the controller detects the deceleration distance coefficient c, the calculation formula involved in step S100 can be adaptively adjusted to: .

[0065] In some examples, the deceleration distance coefficient c can range from 1 to 10. A larger value of c increases the deceleration distance of the moving platen, which can make the machine more stable, but also increases the mold transfer time. This value can be factory-set or user-defined.

[0066] When the movable platen is performing a mold closing operation, the maximum rated deceleration may include only the maximum mold closing rated deceleration. It may also include the maximum mold opening rated deceleration, but in this case, the maximum mold opening rated deceleration is not a concern. When the movable platen is performing a mold opening operation, the maximum rated deceleration may include only the maximum mold opening rated deceleration. It may also include the maximum mold closing rated deceleration, but in this case, the maximum mold closing rated deceleration is not a concern.

[0067] In order to obtain a more accurate maximum mold closing rated deceleration, so as to further improve the control accuracy of the mold closing power flow, and thereby enable the movable mold plate to stop more reliably and timely at the mold closing end position, in some embodiments, the present invention also provides a solution for obtaining the maximum mold closing rated deceleration: the maximum mold closing rated deceleration is calculated based on the rated working pressure of the mold shifting cylinder assembly in the two-plate injection molding machine, the cylinder diameter of the mold shifting cylinder assembly, and the mass of the movable mold plate on which the heaviest mold is installed.

[0068] Similarly, in order to obtain a more accurate maximum mold opening rated deceleration, so as to further improve the control accuracy of the mold opening power flow, and thereby enable the movable mold plate to stop more reliably and timely at the mold opening end position, in some embodiments, the present invention also provides a solution for obtaining the maximum mold opening rated deceleration: the maximum mold opening rated deceleration is calculated based on the rated working pressure of the mold shifting cylinder assembly in the two-plate injection molding machine, the cylinder diameter of the mold shifting cylinder assembly, the diameter of the mold shifting piston rod in the mold shifting cylinder assembly, and the mass of the movable mold plate on which the heaviest mold is installed.

[0069] It is understandable that in order to obtain the maximum rated deceleration of mold closing and the maximum rated deceleration of mold opening, the controller of the two-platen injection molding machine can first obtain the following parameters:

[0070] The mass M of the movable platen with the heaviest mold installed, unit: kg; represents the mass of the machine clamping movable platen assembly of the two-platen injection molding machine when it contains the heaviest mold allowed to be installed;

[0071] Rated working pressure of mold transfer cylinder assembly , unit: MPa;

[0072] Cylinder diameter of mold transfer cylinder assembly , unit: mm;

[0073] Diameter of mold transfer piston rod in mold transfer cylinder assembly , unit: mm;

[0074] Maximum rated mold closing flow rate available for mold closing , unit: L / min;

[0075] Maximum rated mold opening flow rate available for mold opening , unit: L / min.

[0076] The above parameters can be read by the controller from a corresponding database or performance indicator storage space, but are not limited thereto.

[0077] Based on this, the maximum mold closing rated deceleration and maximum mold opening rated deceleration They can be calculated using the following formulas:

[0078]

[0079]

[0080] The above formulas can be derived based on Newton's second law of motion and the relationship between force and pressure. The meaning of each letter in the formula can be found in the relevant description above and will not be repeated here. and The unit can be mm / Based on this, in the calculation process of the mold moving speed, if the moving plate performs the mold opening operation, then As Calculate; if the movable plate performs the closing operation, As Perform calculations.

[0081] After calculating the mold shifting calculation speed corresponding to the current position of the movable template through step S100, the mold shifting calculation speed corresponding to the current position can be compared with the mold shifting setting speed, where the mold shifting setting speed is user-defined, indicating at which position or position range the user wants the movable template to perform the mold shifting operation and at what speed.

[0082] If the comparison result indicates that the calculated mold shift speed corresponding to the current position of the movable platen is less than or equal to the set mold shift speed corresponding to the current position, it means that the set mold shift speed has exceeded the maximum speed that can ensure that the movable platen can reliably and stably stop at the end position of the mold shift. Therefore, to ensure stable and accurate stopping of the movable platen, mold shift control will be performed based on the calculated mold shift speed instead of the user-set mold shift speed. Therefore, step S200 is executed at this time to control the opening of the mold shift proportional valve corresponding to the current position of the movable platen based on the calculated mold shift speed.

[0083] On the other hand, if the comparison result indicates that the calculated mold shift speed corresponding to the current position of the movable platen is greater than the set mold shift speed corresponding to the current position, it means that the set mold shift speed has not exceeded the maximum acceptable speed that can ensure that the movable platen can reliably and stably stop at the end position of the mold shift. Therefore, to ensure user experience, mold shift control can be performed based on user needs at this time. Therefore, step S300 is executed at this time to control the opening of the mold shift proportional valve corresponding to the current position of the movable platen according to the set mold shift speed.

[0084] In the above, the mold shifting setting speed may include a mold closing setting speed and / or a mold opening setting speed. Both the mold closing setting speed and the mold opening setting speed may be user-defined, and their values may be the same or different.

[0085] In some embodiments, to determine the corresponding mold shift proportional valve opening based on mold shift speed, data related to the corresponding mold shift speed and the control voltage of the mold shift proportional valve in the two-platen injection molding machine can be collected in advance to construct a mapping table between mold shift speed and control voltage. Based on this, during the execution of step S200 or step S300, this mapping table can be called to search for the control voltage corresponding to the current calculated mold shift speed or the control voltage corresponding to the current set mold shift speed. The mold shift proportional valve is then controlled using the obtained control voltage to achieve precise control of mold shift.

[0086] The above-mentioned solution of obtaining the control voltage through a mapping table may occupy a certain amount of storage space, and the table lookup operation may take a long time, which may affect the timeliness of the mold shift control. Therefore, to solve this technical problem, in some embodiments, the present invention also provides another solution for obtaining the control voltage based on the mold shift speed. The technical principles of the solution of obtaining the control voltage based on the mold shift calculation speed and the solution of obtaining the control voltage based on the mold shift setting speed are the same, namely:

[0087] In the above step S200, the step of controlling the opening of the mold shift proportional valve in the two-platen injection molding machine according to the calculated mold shift speed may include:

[0088] In step S211, a first mold shift control voltage value corresponding to the current position of the movable platen is calculated based on the mold shift calculation speed using a pre-constructed linear function;

[0089] In step S212, the opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the first mold shift control voltage value.

[0090] Similarly, in the above step S300, the step of controlling the opening of the mold shift proportional valve in the two-platen injection molding machine according to the mold shift set speed may include:

[0091] In step S221, a second mold shift control voltage value corresponding to the current position of the movable platen is calculated based on the mold shift setting speed using a pre-built linear function;

[0092] In step S222, the opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the second mold shift control voltage value.

[0093] As can be seen from the above, the difference between the scheme shown in steps S211-step S212 and the scheme shown in steps S221-step S222 lies in whether the corresponding mold shift control voltage value is obtained based on the mold shift calculation speed or the mold shift setting speed. The specific speed based on which the mold shift control voltage value is obtained can be seen in the relevant description above and will not be repeated here. Therefore, from the scheme shown in steps S211-step S212 and the scheme shown in steps S221-step S222, one is selected for description:

[0094] Taking the scheme shown in steps S211 to S212 as an example, during the execution of step S200, step S211 can be executed first, the shift calculation speed can be substituted into the pre-built linear function, and then the linear function can be used to calculate the corresponding first shift control voltage.

[0095] Then, step S212 may be executed to set the control voltage of the mold shifting proportional valve to the first mold shifting control voltage value obtained in step S211, thereby achieving control of the mold shifting power flow.

[0096] For example, assuming the linear function ,in, and are the coefficients of the function, which are known values. is the mold moving speed, Indicates the mode shift control voltage. Based on this, in the process of executing step S211, the mode shift calculation speed can be substituted into In, at this time The value of is the corresponding first mold shift control voltage value. Similarly, in the process of executing step S221, the mold shift setting speed can be set to Substitute into In, at this time The value of is the corresponding second mode shift control voltage value.

[0097] In some embodiments, for a scenario where a movable platen performs a mold closing operation, the present invention further provides a solution for constructing a linear function. Based on this, the linear function may include a mold closing linear function. The process of constructing the mold closing linear function includes:

[0098] In step S011, the maximum rated mold closing speed of the movable platen is obtained according to the maximum mold closing flow of the two-platen injection molding machine, the cylinder diameter of the mold shifting cylinder assembly in the two-platen injection molding machine, and the diameter of the mold shifting piston rod in the mold shifting cylinder assembly;

[0099] In step S012, the mold clamping linear function is constructed with the mold clamping speed as the independent variable and the mold clamping control voltage as the dependent variable according to the maximum rated mold clamping speed and its corresponding maximum mold clamping control voltage, as well as the minimum mold clamping speed and its corresponding minimum mold clamping control voltage; wherein the minimum mold clamping speed is 0.

[0100] It is understandable that before executing the above steps S100 to S300 of the present invention, a closed-mode linear function may be constructed through steps S011 to S012.

[0101] During the execution of step S011, the maximum rated mold closing speed can be calculated using the following formula:

[0102]

[0103] The above formula can be obtained based on the relationship between flow and speed. After calculation by the above formula, The unit is converted to mm / s, that is, in the formula, is the maximum rated mold closing speed, unit: mm / s. The meanings of other letters can be found in the relevant records above and will not be repeated here.

[0104] After obtaining the maximum rated mold closing speed, step S012 may be performed, with the mold closing speed as the independent variable and the mold closing control voltage as the dependent variable, based on two coordinate points: and , we can construct a closed-mode linear function based on relevant mathematical principles. Indicates the maximum clamping control voltage, Indicates the minimum clamping control voltage.

[0105] For example, assuming that in the case of mold closing operation, the maximum mold closing control voltage that the mold shift proportional valve can achieve is +10V, based on the maximum clamping control voltage , which can make the closing speed of the movable plate reach the maximum rated closing speed , so we can get the coordinate point . And assume that the minimum clamping control voltage that the mold shift proportional valve can achieve is +1.3V, based on this minimum closing mode control voltage , the closing speed of the movable platen can be made to reach 0, so the coordinate point can be obtained ( ).

[0106] Based on this, the obtained closing linear function can be: In this case, the above formula middle, , .

[0107] In some embodiments, for a scenario where a movable platen performs a mold opening operation, the present invention further provides a corresponding linear function construction scheme. Based on this, the linear function may include a mold opening linear function. The construction process of the mold opening linear function includes:

[0108] In step S021, the maximum rated mold opening speed of the movable platen is obtained according to the maximum rated mold opening flow rate of the two-platen injection molding machine and the diameter of the mold shifting piston rod;

[0109] In step S022, the mold opening speed is used as the independent variable and the mold opening control voltage is used as the dependent variable. The mold opening linear function is constructed according to the maximum rated mold opening speed and its corresponding maximum mold opening control voltage, as well as the minimum mold opening speed and its corresponding minimum mold opening control voltage; wherein the minimum mold opening speed is 0.

[0110] It is understandable that before executing the above steps S100 to S300 of the present invention, the mold opening linear function can be constructed through steps S021 to S022.

[0111] During the execution of step S021, the maximum rated mold opening speed can be calculated using the following formula:

[0112]

[0113] In the formula, is the maximum rated mold opening speed, unit: mm / s. The meanings of other letters can be found in the relevant records above and will not be repeated here.

[0114] After obtaining the maximum rated mold opening speed, step S022 may be executed, with the mold opening speed as the independent variable and the mold opening control voltage as the dependent variable, based on two coordinate points: and , we can construct the open-mode linear function based on relevant mathematical principles. Indicates the maximum open-mode control voltage, Indicates the minimum mold opening control voltage.

[0115] For example, assuming that in the case of mold opening operation, the maximum mold opening control voltage that the mold shift proportional valve can reach is is -10V, based on the maximum open-mode control voltage , which can make the opening speed of the movable platen reach the maximum rated opening speed , so we can get the coordinate point . And assume that the minimum mold opening control voltage that the mold shift proportional valve can achieve is -1.3V, based on this minimum open-mode control voltage , the opening speed of the movable platen can be made to reach 0, so the coordinate point can be obtained ( ).

[0116] It should be understood that the magnitude of the above voltage does not depend on the “+” sign and “-” sign in front of it, but on the magnitude of the value after the sign. The sign is only used to distinguish the control voltage of the mold closing operation from the control voltage of the mold opening operation.

[0117] Based on this, the obtained mold opening linear function can be: In this case, the above formula middle, , .

[0118] Therefore, no matter it is a mold closing operation or a mold opening operation, the mold shifting control voltage value for controlling the opening size of the mold shifting proportional valve can be calculated based on the corresponding mold shifting speed by calling the corresponding linear function. Compared with the mapping table method, there is no need to pre-store too much data, and the data collection process is omitted, so that the acquisition efficiency of the mold shifting control voltage value is higher, and the movable plate can be better controlled in a timely and accurate manner, so that the movable plate can be better locked to the mold shifting end position in time.

[0119] The above-mentioned scheme for obtaining the non-deceleration position range and the target deceleration position range does not take into account the machine's own motion performance, but is user-defined. This can easily lead to excess or insufficient distance in the target deceleration position range obtained. Excessive distance may increase the mold shifting time of the movable platen, which is not conducive to improving production efficiency, while insufficient distance may result in the movable platen not having sufficient deceleration distance for braking. Therefore, in order to solve these technical problems, in some embodiments, the present invention also provides another scheme for obtaining the non-deceleration position range and the target deceleration position range. Please refer to Figure 3 , Figure 3: is a schematic diagram of a flow chart for obtaining a non-deceleration position range provided by the present invention. The mold shifting control method of a two-plate injection molding machine provided by the present invention may further include:

[0120] In step Sa1, according to the maximum rated mold shifting speed and the maximum rated deceleration of the movable platen, a minimum deceleration distance required for the movable platen to decelerate from the maximum rated mold shifting speed to zero is determined;

[0121] In step Sa2, the target deceleration distance of the moving plate is determined according to the minimum deceleration distance and the set deceleration distance coefficient;

[0122] In step Sa3, the non-deceleration position range is determined according to the set mold shifting starting position of the movable platen and the target deceleration distance.

[0123] Therefore, before executing steps S100 to S300 , the non-deceleration position range can be acquired through steps Sa1 to Sa3 .

[0124] In the process of executing step Sa1, the formula The minimum deceleration distance is calculated, where Indicates the minimum deceleration distance, unit: mm, Indicates the maximum rated mold moving speed, correspondingly, It represents the square of the maximum rated mold moving speed. Indicates the maximum rated deceleration.

[0125] For example, in the mold closing operation, the minimum deceleration distance required for the moving platen The minimum deceleration distance required for the moving platen during the mold opening operation .

[0126] Then, during the execution of step Sa2, the formula Calculate the target deceleration distance, is the deceleration distance coefficient. Its source can be found in the relevant records above and will not be elaborated here.

[0127] For example, in the mold closing operation, the target deceleration distance required for the moving platen , Indicates the deceleration distance coefficient detected during mold closing operation. In mold opening operation, the target deceleration distance required for the movable platen , Indicates the deceleration distance coefficient detected during the mold opening operation.

[0128] After obtaining the target deceleration distance, step Sa3 can be executed. If the starting position of the mold shift is zero, the [starting position of the mold shift, the ending position of the mold shift] can be set. The position range corresponding to [mold shift start position, target deceleration distance] is used as the non-deceleration position range. Conversely, if the mold shift end position is zero, the position range corresponding to [mold shift start position, target deceleration distance] can be used as the non-deceleration position range.

[0129] Correspondingly, when the starting position of the mold shift is zero, the [end position of the mold shift The position range corresponding to [target deceleration distance, mold shifting end position] is used as the target deceleration position range; when the mold shifting end position is zero, the position range corresponding to [target deceleration distance, mold shifting end position] is used as the target deceleration position range.

[0130] Therefore, by incorporating the dynamic performance of the movable platen to determine the non-deceleration position range and the target deceleration position range, it is possible to better ensure that the movable platen stops promptly and accurately at the end of mold shifting, thereby better ensuring the dynamic stability of the movable platen. On this basis, combined with the mold shifting control scheme of steps S100 to S300, an even better braking effect can be achieved - the movable platen is locked promptly and accurately at the set end of mold shifting position.

[0131] In some embodiments, to ensure that the position of the movable platen during mold closing and mold opening operations is consistent, thereby better ensuring the operating effect of the movable platen, the mold closing end position corresponding to the movable platen during mold closing operations and the mold opening start position corresponding to the movable platen during mold opening operations are the same, both being zero. Furthermore, the mold closing start position corresponding to the movable platen during mold closing operations and the mold opening end position corresponding to the movable platen during mold opening operations are the same.

[0132] Based on the embodiment shown in steps Sa1 to Sa3, in order to ensure that the target deceleration position range obtained can more reliably ensure that the movable platen stops promptly and accurately at the end position of the mold movement, in some embodiments, the present invention also provides another solution for obtaining the target deceleration position range, please refer to Figure 4 , Figure 4 : is a schematic diagram of a process for obtaining a target deceleration position range provided by the present invention. The mold shifting control method of a two-plate injection molding machine provided by the present invention may further include:

[0133] In step Sb1, the actual deceleration distance required by the movable platen is obtained according to the maximum set mold shifting speed of the movable platen in the non-deceleration position range and the maximum rated deceleration of the movable platen;

[0134] In step Sb2, the target deceleration position range corresponding to the movable platen is determined according to the actual deceleration distance and the set mold shifting end position.

[0135] After executing step Sa3, you can execute steps Sb1 to Sb2. During the execution of step Sb1, first obtain the maximum set mold moving speed within the non-deceleration position range, and then use the formula Calculate the actual deceleration distance required at the maximum set mold moving speed, where: It indicates the maximum set mold moving speed of the movable platen within the non-deceleration position range. The meanings of other letters are described above. If c is not set, c in the formula can be deleted.

[0136] For example, in the mold closing operation, the actual deceleration distance required by the moving platen ,in, Indicates the maximum set mold closing speed of the movable platen in the non-deceleration position range; in the mold opening operation, the actual deceleration distance required by the movable platen ,in, Indicates the maximum set mold opening speed of the movable platen within the non-deceleration position range.

[0137] After obtaining the actual deceleration distance required by the movable platen through step Sb1, step Sb2 can be executed to determine the target deceleration position range corresponding to the movable platen according to the actual deceleration distance and the set mold shifting end position.

[0138] For example, if the mold closing end position and the mold opening start position are the same, both are zero, then in the mold closing operation, the target deceleration position range is [ , mold closing end position]; in mold opening operation, the target deceleration position range is [mold opening end position , mold opening end position].

[0139] Since the maximum set mold shifting speed of the movable platen is user-defined and the movable platen will not operate at a speed exceeding the maximum set mold shifting speed, the position of the movable platen during the mold shifting process is divided into a non-deceleration position range and a target deceleration position range. The target deceleration position range is determined based on the maximum set mold shifting speed of the movable platen in the non-deceleration stage and the maximum rated deceleration of the movable platen. This ensures that the target deceleration position range better meets the distance requirements for the movable platen to accurately and reliably decelerate to the mold shifting end position. On this basis, after the movable platen enters the deceleration stage, the corresponding mold shifting calculated speed is calculated in real time based on the current position of the movable platen and the maximum rated deceleration. The calculated mold shifting speed is compared with the corresponding set mold shifting speed for each calculation, and the smallest value is selected to control the mold shifting corresponding to the current position of the movable platen. This ensures that the movable platen can eventually stop at the set mold shifting end position in a timely manner regardless of the position it reaches during the deceleration stage. Therefore, through the combination of the above two technical aspects, it is possible to better lock the movable platen at the mold shifting end position in a timely and accurate manner.

[0140] In some embodiments, to further improve the mold shifting braking effect and save energy, the mold shifting control method of a two-platen injection molding machine provided in an embodiment of the present invention may further include:

[0141] In step S410, when the calculated mold shifting speed is less than or equal to the set mold shifting speed, the mold shifting flow rate of the main oil circuit in the two-platen injection molding machine is controlled according to the calculated mold shifting speed;

[0142] And / or, in step S420, when the calculated mold shifting speed is greater than the set mold shifting speed, the mold shifting flow rate of the main oil circuit in the two-platen injection molding machine is further controlled according to the set mold shifting speed.

[0143] In essence, both step S410 and step S420 control the mold shifting flow of the main oil circuit according to the mold shifting speed. The difference lies in whether the control is based on the calculated mold shifting speed or the set mold shifting speed. For details, please refer to the relevant records above and will not be repeated here.

[0144] Therefore, by utilizing the mold shifting speed to control both the opening of the mold shifting proportional valve and the mold shifting flow rate of the main oil circuit, not only can the mold shifting braking effect be improved by combining the two, but also the oil consumption in the oil circuit can be saved, avoiding energy waste.

[0145] In some examples, a mapping relationship table between the mold shifting speed and the mold shifting flow rate can be constructed in advance based on the correlation between the mold shifting speed and the mold shifting flow rate of the main oil circuit. Therefore, during the execution of step S410 or step S420, the mapping relationship table can be called to obtain the mold shifting flow rate corresponding to the current mold shifting speed, and the valve opening size between the main oil circuit and the oil supply tank can be controlled based on the mold shifting flow rate.

[0146] In other examples, to reduce the amount of data stored and improve the efficiency and accuracy of determining the mold shifting flow rate, in step S410, the step of controlling the mold shifting flow rate of the main oil circuit in the two-platen injection molding machine according to the calculated mold shifting speed may include:

[0147] In step S411, when the movable platen is in the mold closing operation, the corresponding mold closing flow rate is obtained according to the mold closing calculation speed, the cylinder diameter of the mold shifting cylinder assembly, and the diameter of the mold shifting piston rod in the mold shifting cylinder assembly;

[0148] In step S412, when the movable platen is in the mold opening operation, the corresponding mold opening flow rate is obtained according to the mold opening calculation speed and the mold shifting piston rod diameter of the mold shifting cylinder assembly.

[0149] Based on this, the mold closing flow corresponding to the current position of the movable plate and mold opening flow They can be calculated using the following formulas:

[0150]

[0151]

[0152] In the above formula, the mold closing flow corresponding to the current position of the movable plate is and mold opening flow The unit is L / min. Indicates the mold closing calculation speed corresponding to the current position of the movable plate. Indicates the calculated mold opening speed corresponding to the current position of the movable platen, and the meanings of other letters can be found in the relevant records above.

[0153] The principle of obtaining the mold shifting flow rate of the main oil circuit in the two-platen injection molding machine in step S420 is the same as that of step S410. Any of the implementations mentioned in step S410 can be adopted, except that the mold shifting calculation speed in step S410 is replaced by the mold shifting setting speed. For example, in step S420, controlling the mold shifting flow rate of the main oil circuit in the two-platen injection molding machine according to the mold shifting setting speed may include:

[0154] In step S421, when the movable platen is in the mold closing operation, the corresponding mold closing flow rate is obtained according to the mold closing set speed, the cylinder diameter of the mold shifting cylinder assembly, and the diameter of the mold shifting piston rod in the mold shifting cylinder assembly;

[0155] In step S422, when the movable platen is in the mold opening operation, the corresponding mold opening flow rate is obtained according to the mold opening setting speed and the mold shifting piston rod diameter of the mold shifting cylinder assembly.

[0156] The technical principles of step S421 and step S422 can be found in the relevant records of step S411 and step S412, and will not be repeated here.

[0157] Any embodiments of the mold shifting control method for a two-platen injection molding machine provided by the present invention can be combined with each other to form a new solution as long as there is no combination contradiction.

[0158] An embodiment of the present invention provides a mold shifting control method for a plate injection molding machine. If implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0159] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. For ordinary technicians in this field, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A mold shifting control method for a two-plate injection molding machine, characterized in that: include: When the current position of the movable platen in the two-platen injection molding machine is within the target deceleration position range, the mold shifting calculation speed corresponding to the current position of the movable platen is obtained based on the current position of the movable platen and the maximum rated deceleration using a first formula; wherein the first formula is: , Indicates the speed of mold transfer calculation, Indicates the distance between the current position of the movable platen and the end position of the mold shifting. Indicates the maximum rated deceleration of the moving plate; When a calculated mold shift speed corresponding to the current position of the movable platen is less than or equal to a set mold shift speed corresponding to the current position of the movable platen, controlling an opening of a mold shift proportional valve in the two-platen injection molding machine according to the calculated mold shift speed; When the calculated mold shift speed is greater than the set mold shift speed, controlling the opening of the mold shift proportional valve in the two-platen injection molding machine according to the set mold shift speed; The target deceleration position range is determined by: The minimum deceleration distance required for the movable platen to decelerate from the maximum rated mold shifting speed to zero is determined by a second formula based on the maximum rated mold shifting speed of the movable platen and the maximum rated deceleration; wherein the second formula is: , Indicates the minimum deceleration distance, It represents the square of the maximum rated mold moving speed, Indicates the maximum rated deceleration; The target deceleration distance of the moving plate is determined by a third formula based on the minimum deceleration distance and the set deceleration distance coefficient; wherein the third formula is: , represents the target deceleration distance, Indicates the deceleration distance coefficient, the value range is [1, 10], Indicates the minimum deceleration distance; Determining a non-deceleration position range according to a set mold shifting starting position of the movable platen and the target deceleration distance; The actual deceleration distance required by the movable platen is obtained by the fourth formula based on the maximum set mold moving speed of the movable platen in the non-deceleration position range and the maximum rated deceleration of the movable platen; wherein the fourth formula is: , Indicates the actual deceleration distance, Indicates the maximum set mold moving speed of the movable plate within the non-deceleration position range. represents the deceleration distance coefficient, Indicates the maximum rated deceleration; According to the actual deceleration distance and the set mold shifting end position, the target deceleration position range corresponding to the movable platen is determined.

2. The mold shifting control method of a two-plate injection molding machine according to claim 1, characterized in that: The method further comprises: When the current position of the movable platen is in the non-deceleration position range, the opening of the mold shifting proportional valve in the two-platen injection molding machine is controlled according to the maximum mold clamping control voltage corresponding to the maximum rated mold shifting speed of the movable platen.

3. The mold shifting control method of a two-plate injection molding machine according to claim 1 or 2, characterized in that: The step of controlling the opening of the mold shift proportional valve in the two-plate injection molding machine according to the calculated mold shift speed includes: Calculating a first mold shift control voltage value corresponding to the current position of the movable platen based on the mold shift calculation speed using a pre-constructed linear function; controlling an opening of a mold shift proportional valve in the two-platen injection molding machine according to the first mold shift control voltage value; And / or, the step of controlling the opening of the mold shift proportional valve in the two-platen injection molding machine according to the mold shift setting speed includes: Calculating a second mold shift control voltage value corresponding to the current position of the movable platen based on the mold shift setting speed through a pre-constructed linear function; The opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the second mold shift control voltage value.

4. The mold shifting control method of a two-plate injection molding machine according to claim 3, wherein: The linear function includes a closing linear function; and the construction process of the closing linear function includes: The maximum rated mold closing speed of the movable platen is obtained according to the maximum mold closing flow of the two-platen injection molding machine, the cylinder diameter of the mold shifting cylinder assembly in the two-platen injection molding machine, and the diameter of the mold shifting piston rod in the mold shifting cylinder assembly; The mold clamping linear function is constructed with the mold clamping speed as the independent variable and the mold clamping control voltage as the dependent variable, according to the maximum rated mold clamping speed and its corresponding maximum mold clamping control voltage, as well as the minimum mold clamping speed and its corresponding minimum mold clamping control voltage; wherein the minimum mold clamping speed is 0.

5. The mold shifting control method of a two-plate injection molding machine according to claim 3, wherein: The linear function includes a mold opening linear function; and the construction process of the mold opening linear function includes: Obtaining a maximum rated mold opening speed of the movable platen according to the maximum rated mold opening flow rate of the two-platen injection molding machine and the diameter of the mold shifting piston rod; With the mold opening speed as the independent variable and the mold opening control voltage as the dependent variable, the mold opening linear function is constructed according to the maximum rated mold opening speed and its corresponding maximum mold opening control voltage, as well as the minimum mold opening speed and its corresponding minimum mold opening control voltage; wherein the minimum mold opening speed is 0.

6. The mold shifting control method of a two-platen injection molding machine according to claim 1, wherein: In a case where the mold shift calculation speed is less than or equal to the mold shift setting speed, the method further includes: Controlling the mold shifting flow rate of the main oil circuit in the two-plate injection molding machine according to the calculated mold shifting speed; And / or, when the mold shift calculation speed is greater than the mold shift setting speed, the method further includes: The mold shifting flow rate of the main oil circuit in the two-plate injection molding machine is controlled according to the mold shifting setting speed.

7. The mold shifting control method of a two-plate injection molding machine according to claim 1, wherein: The maximum rated deceleration includes the maximum mold closing rated deceleration and / or the maximum mold opening rated deceleration; The maximum rated deceleration for mold closing is calculated based on the rated working pressure of the mold shifting cylinder assembly in the two-plate injection molding machine, the cylinder diameter of the mold shifting cylinder assembly, and the mass of the movable platen on which the heaviest mold is installed; and / or, the maximum rated deceleration for mold opening is calculated based on the rated working pressure of the mold shifting cylinder assembly in the two-plate injection molding machine, the cylinder diameter of the mold shifting cylinder assembly, the diameter of the mold shifting piston rod in the mold shifting cylinder assembly, and the mass of the movable platen on which the heaviest mold is installed.

8. A two-platen injection molding machine, characterized in that: It comprises a movable platen and a controller; the controller is used to control the mold movement of the movable platen through the method according to any one of claims 1 to 7.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores machine-executable instructions that can be executed by the processor, and the processor is configured to execute the machine-executable instructions to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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