Mold moving control method of two-plate injection molding machine and related device

Abstract

The invention discloses a mold moving control method of a two-plate injection molding machine and a related device, and relates to the technical field of injection molding device.The method comprises the steps that under the condition that the current position of a movable mold plate in the two-plate injection molding machine is located in the target deceleration position range, according to the current position and the maximum rated deceleration of the movable mold plate, the target deceleration position range of the movable mold plate in the two-plate injection molding machine is within the target deceleration position range; the mold moving calculation speed corresponding to the current position of the movable mold plate is obtained; under the condition that the mold moving calculation speed corresponding to the current position of the movable mold plate is smaller than or equal to the mold moving set speed corresponding to the current position of the movable mold plate, an opening of a mold moving proportional valve in the two-plate injection molding machine is controlled according to the mold moving calculation speed; and under the condition that the mold moving calculation speed is greater than the mold moving set speed, controlling an opening of a mold moving proportional valve in the two-plate injection molding machine according to the mold moving set speed. Therefore, the movable mold plate in the two-plate injection molding machine can be accurately locked at the mold moving ending 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 a related device of a two-platen injection molding machine. Background Art

[0002] Injection molding machine is a main molding equipment that uses plastic molding molds to make thermoplastic plastics or thermosetting plastics into plastic products of various shapes. The work process of injection molding machine involves mold closing and mold opening. The purpose of mold closing is to make the movable mold plate and the static mold plate close together to form a closed molding space; mold opening is generally the next step after mold closing, which separates the movable mold plate from the static mold plate to facilitate the removal of the molded parts. The mold closing and mold opening operations of the injection molding machine can be called mold transfer operations.

[0003] In the mold shifting operation, the deceleration and braking process of the moving template is usually involved. In order to reduce the moving friction resistance of the moving template, some injection molding machines generally use linear guides with less friction resistance as the moving guides of the moving template. Therefore, when deceleration and braking are required in the mold opening operation, the moving template cannot be decelerated smoothly due to the reduction of friction resistance, and the position where the moving template finally stays may be shifted. Excessive shift deviation of the moving template will cause the robot to be unable to remove the molded parts, and then malfunction. In addition, when deceleration and braking are required in the mold opening operation, the braking force is completely provided by the mold clamping cavity, and the mold clamping cavity of the two-plate injection molding machine is a rod cavity, and its oil pressure area is small and can only rely on high back pressure to provide braking force. At this time, it is necessary to reduce the opening of the mold shifting proportional valve to provide high back pressure, but the reduction of the opening of the mold shifting proportional valve will cause the mold opening cavity to be unable to replenish oil in time. If there is a vacuum in the mold opening cavity, there will be rebound and vibration after the mold is in place, which will cause the moving template to shift in position. When deceleration and braking are required during mold closing operation, the movable mold plate 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 hold.

[0004] Therefore, the related art has a technical problem that the movable mold plate 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 mold plate 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, the mold shifting calculation 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 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 of the movable platen, the opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the calculated mold shift speed;

[0010] In a case where the calculated mold shifting speed is greater than the set mold shifting speed, the opening of the mold shifting proportional valve in the two-platen injection molding machine is controlled according to the set mold shifting 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 die 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 die shifting speed to zero;

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

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

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

[0018] 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, the actual deceleration distance required by the movable platen is obtained;

[0019] According to the actual deceleration distance and the set mold shifting end position, the target deceleration position range corresponding to the movable mold plate 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 mold shift calculation speed includes:

[0021] Based on the mold shift calculation speed, a first mold shift control voltage value corresponding to the current position of the movable mold plate is calculated by a pre-constructed linear function;

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

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

[0024] The second mold shift control voltage value corresponding to the current position of the movable plate is calculated based on the mold shift setting speed by a pre-constructed linear function;

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

[0026] In an optional implementation, the linear function includes a closing linear function; and the construction process of 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 by taking 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 construction process of the mold opening linear function includes:

[0030] 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, the maximum rated mold opening speed of the movable platen is obtained;

[0031] The mold opening linear function is constructed by taking the mold opening speed as the independent variable and the mold opening control voltage as the dependent variable 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 shifting calculation speed is less than or equal to the mold shifting 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 mold shifting calculation speed;

[0034] And / or, when the mold shifting calculation speed is greater than the mold shifting 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 of 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 of 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] A third aspect of an embodiment 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 a two-plate injection molding machine provided in any embodiment of the first aspect above.

[0040] A fourth aspect of an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the mold shifting control method of a two-plate injection molding machine provided in any one of the embodiments of the first aspect above is implemented.

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

[0042] The target deceleration position range is divided from the position interval that the movable template passes through during the mold shifting process, and after the movable template enters the deceleration section (i.e., the target deceleration position range), the corresponding mold shifting calculation speed is calculated in real time according to the current position of the movable template and the maximum rated deceleration, and the mold shifting calculation speed calculated each time is compared with the corresponding mold shifting setting speed, so as to select the smallest value to control the opening of the mold shifting proportional valve corresponding to the current position of the movable template, which can not only ensure that the movable template can stop at the set mold shifting end position in time no matter where it runs during the operation of the deceleration section, but also realize lower mold shifting flow control in the deceleration section, which is conducive to reducing energy consumption. In this way, the movable template can be locked at the set mold shifting end position in a timely and accurate manner, and energy consumption can be saved. 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-plate 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] In order to facilitate the 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. The mechanisms or methods not described in the present invention can refer to the prior art. The specific structure and features of the present invention are described below in an exemplary manner, which 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 implied in the figure, can continue to be arbitrarily combined or deleted between these technical features, thereby forming more other embodiments that may not be directly or indirectly mentioned in the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. 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 make the disclosure of the present invention more thoroughly and comprehensively understood.

[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, the processor 120 and the communication module 130 are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through 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, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc.

[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 as shown, or with Figure 1 Different configurations are 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 be used 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 The present invention provides a flow chart of a mold shifting control method for a two-plate injection molding machine, wherein the mold shifting control method for the two-plate injection molding machine comprises:

[0056] In step S100, when the current position of the movable platen in the two-plate 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 according to the current position of the movable platen and the maximum rated deceleration;

[0057] In step S200, 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, the opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the mold shift calculation speed;

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

[0059] In order to ensure the efficiency of the mold shifting of the movable platen, and thus ensure the output efficiency of the two-plate 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 section 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 section 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. Correspondingly, the distance between the mold shifting start position and the starting point of the deceleration section corresponds to the non-deceleration section, which can also be called the non-deceleration position range.

[0060] Therefore, when the movable platen performs any mold shifting operation, such as mold closing operation or mold opening operation, the above steps S100 to S300 may be performed to ensure that the movable platen can stop at the set mold shifting end position in a timely and accurate manner.

[0061] During the execution of step S100, the mold transfer calculation speed can be calculated by the formula Calculated, among which, Indicates the speed of mold transfer calculation, Indicates the distance between the current position of the moving plate 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 body used to execute the mold shifting control method of the two-plate injection molding machine provided by the present invention, so as to send the detected current position of the movable template to the execution body.

[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 make the motion stability of the movable platen and the mold shifting time 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 may have a value range of [1, 10]. The larger the value of c, the larger the deceleration distance of the moving platen, which can make the machine operation more stable, but the mold shifting time will also be longer. This value can be a preset value before the machine leaves the factory, or it can be modified by the user according to needs.

[0066] In the case of the movable platen performing the mold closing operation, the maximum rated deceleration may only include the maximum mold closing rated deceleration, and of course may also include the maximum mold opening rated deceleration, but in this case, there is no need to pay attention to the maximum mold opening rated deceleration. In the case of the movable platen performing the mold opening operation, the maximum rated deceleration may only include the maximum mold opening rated deceleration, and of course may also include the maximum mold closing rated deceleration, but in this case, there is no need to pay attention to the maximum mold closing rated deceleration.

[0067] In order to obtain a higher accuracy maximum mold closing rated deceleration, 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 installed with the heaviest mold.

[0068] Similarly, in order to obtain a higher accuracy maximum mold opening rated deceleration, 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 installed with the heaviest mold.

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

[0070] The mass M of the moving platen with the heaviest mold installed, unit: kg; represents the mass of the machine clamping moving 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 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 by the following formulas:

[0078]

[0079]

[0080] The above formulas can be obtained 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 above related records and will not be repeated here. and The unit can be mm / Based on this, in the calculation process of mold shifting speed, if the moving mold plate performs the mold opening operation, then As Calculate; if the moving plate performs a closing operation, As Perform calculations.

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

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

[0083] On the contrary, if the comparison result indicates that the calculated mold shifting speed corresponding to the current position of the movable template is greater than the set mold shifting speed corresponding to the current position, it means that the set mold shifting speed has not exceeded the maximum acceptable speed that can ensure that the movable template can be reliably and stably stopped at the end position of the mold shifting. Therefore, in order to ensure the user experience, the mold shifting control can be performed based on the user's needs at this time. Therefore, step S300 is executed at this time to control the opening of the mold shifting proportional valve corresponding to the current position of the movable template according to the set mold shifting 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 customized by the user, and their values ​​may be the same or different.

[0085] In some embodiments, in order to obtain the corresponding mold shift proportional valve opening according to the mold shift speed, the relevant data between the corresponding mold shift speed and the control voltage of the mold shift proportional valve in the two-plate injection molding machine can be collected in advance to construct a mapping relationship table between the mold shift speed and the control voltage. Based on this, in the process of executing step S200 or step S300, the mapping relationship table can be called to search for the control voltage corresponding to the current mold shift calculation speed, or the control voltage corresponding to the current mold shift setting speed, and then the mold shift proportional valve is controlled by the obtained control voltage, so that precise control of the mold shift can be achieved.

[0086] The above-mentioned scheme of obtaining the control voltage through the mapping relationship table may occupy a certain storage space, and the table lookup operation may take up a lot of time, which may affect the timeliness of the control of the mold shifting. Therefore, in order to solve this technical problem, in some embodiments, the present invention also provides another scheme for obtaining the control voltage based on the mold shifting speed, wherein the scheme for obtaining the control voltage based on the mold shifting calculation speed and the scheme for obtaining the control voltage based on the mold shifting setting speed have the same technical principle, that is:

[0087] In the above step S200, the step of controlling the opening of the mold shift proportional valve in the two-plate injection molding machine according to the mold shift calculation 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 by using a pre-constructed linear function;

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

[0090] Similarly, in the above step S300, the step of controlling the opening of the mold shifting proportional valve in the two-plate injection molding machine according to the mold shifting setting 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 by using a pre-constructed linear function;

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

[0093] From the above, it can be seen that the difference between the scheme shown in step S211~step S212 and the scheme shown in step S221~step S222 is whether the corresponding mold shift control voltage value is obtained based on the mold shift calculation speed or the mold shift setting speed. As for which speed is used to obtain the mold shift control voltage value, it can be seen from the relevant records above, and it will not be repeated here. Therefore, from the scheme shown in step S211~step S212 and the scheme shown in step S221~step S222, one is selected for description:

[0094] Taking the scheme shown in step S211 to step S212 as an example, in the process of executing step S200, step S211 can be executed first, the shift calculation speed is substituted into the pre-constructed linear function, and then the linear function is 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 rate.

[0096] For example, assuming the linear function ,in, and are the coefficients of the function, which are known values. is the mold moving speed, represents the shift control voltage. Based on this, in the process of executing step S211, the 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 Substitute into In, at this time The value of is the corresponding second shift control voltage value.

[0097] In some embodiments, for the scenario where the 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 construction process of 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 speed is used as the independent variable and the mold clamping control voltage is used as the dependent variable. The mold clamping linear function is constructed 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 by 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, It is the maximum rated mold closing speed, the unit is: mm / s. The meanings of other letters can be found in the above related records 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 closing control voltage.

[0105] For example, assuming that in the case of mold closing operation, the maximum mold closing control voltage that the mold shifting proportional valve can achieve is is +10V, based on the maximum clamping control voltage , which can make the closing speed of the movable mold 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 mold plate can reach 0, so the coordinate point can be obtained ( ).

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

[0107] In some embodiments, for the scenario where the movable platen performs a mold opening operation, the present invention further provides a corresponding linear function construction scheme, based on which the linear function may include a mold opening linear function, and 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 taken as the independent variable and the mold opening control voltage is taken 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 can be understood 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 by the following formula:

[0112]

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

[0114] After obtaining the maximum rated mold opening speed, step S022 may be performed, 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 , based on relevant mathematical principles, we can construct a linear function for opening the mold. Indicates the maximum open-mode control voltage, Indicates the minimum open-mode 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 achieve is is -10V, based on the maximum open-mode control voltage , which can make the opening speed of the movable mold plate 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 is -1.3V, based on this minimum open-mode control voltage , the opening speed of the movable mold plate can 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 preceding “+” and “-” signs, but on the magnitude of the numerical value following the sign. The sign is only used to distinguish the control voltage for mold closing operation from the control voltage for mold opening operation.

[0117] Based on this, the obtained mold opening linear function can be: In this case, it can be seen that 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 mold plate can be better controlled in a timely and accurate manner, so that the movable mold plate can be better locked to the mold shifting end position in a timely manner.

[0119] The above-mentioned acquisition schemes for the non-deceleration position range and the target deceleration position range do not take into account the motion performance of the machine itself, but are user-defined, which can easily lead to excess or insufficient distance in the target deceleration position range obtained in the end. 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 acquisition scheme for 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 of 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 also include:

[0120] In step Sa1, according to the maximum rated mold shifting speed and the maximum rated deceleration of the movable platen, the 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 mold plate and the target deceleration distance.

[0123] Therefore, before executing steps S100 to S300 , the non-deceleration position range may 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, in mm. Indicates the maximum rated mold transfer 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, in the process of executing step Sa2, the formula Calculate the target deceleration distance, It 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 in the mold closing operation. In the mold opening operation, the target deceleration distance required for the moving 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 mold shifting starting position is zero, [mold shifting starting position, mold shifting ending position The position range corresponding to [mold shifting start position, target deceleration distance) is used as the non-deceleration position range. Conversely, if the mold shifting end position is zero, the position range corresponding to [mold shifting start position, target deceleration distance) can be used as the non-deceleration position range.

[0129] Correspondingly, when the starting position of the mold shifting is zero, the [end position of the mold shifting 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 motion performance of the movable platen to obtain 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 position of the mold shifting, and to better ensure the motion stability of the movable platen. On this basis, combined with the mold shifting control scheme of step S100 to step S300, a better braking technical effect can be achieved - the movable platen is locked promptly and accurately at the set end position of the mold shifting.

[0131] In some embodiments, in order to ensure that the position of the movable platen has the same standard in the mold closing operation and the mold opening operation, and thus better ensure the operation effect of the movable platen, the mold closing end position corresponding to the movable platen in the mold closing operation and the mold opening start position corresponding to the movable platen in the mold opening operation are the same, both are zero positions. In addition, the mold closing start position corresponding to the movable platen in the mold closing operation and the mold opening end position corresponding to the movable platen in the mold opening operation are the same.

[0132] Based on the embodiment shown in step Sa1 to step 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 transfer, 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 flow 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 also 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, steps Sb1 to Sb2 can be executed. In the process of executing step Sb1, the maximum set mold moving speed within the non-deceleration position range is first obtained, and then the maximum set mold moving speed within the non-deceleration position range is obtained through the formula The actual deceleration distance required at the maximum set mold shifting speed is calculated, where: It indicates the maximum set mold shifting speed of the movable platen within the non-deceleration position range. The meanings of other letters can be found in the relevant records above. Among them, 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 the actual deceleration distance required by the movable platen is obtained 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 template is customized by the user, and the movable template will not run at a speed exceeding the maximum set mold shifting speed, the position of the movable template in the mold shifting process is divided into a non-deceleration position range and a target deceleration position range, and the target deceleration position range is determined according to the maximum set mold shifting speed of the movable template in the non-deceleration section and the maximum rated deceleration of the movable template, so that the target deceleration position range can better meet the distance requirements of the movable template to accurately and reliably decelerate to the end position of the mold shifting. On this basis, after the movable template enters the deceleration section, the corresponding mold shifting calculation speed is calculated in real time according to the current position of the movable template and the maximum rated deceleration, and the calculated mold shifting speed calculated each time is compared with the corresponding mold shifting setting speed, and the one with the smallest value is selected to control the mold shifting corresponding to the current position of the movable template, so that the movable template can be ensured to stop at the set mold shifting end position in time no matter where it runs during the deceleration section. Therefore, through the combination of the above two technical levels, it is possible to better lock the movable template in the mold shifting end position in a timely and accurate manner.

[0140] In some embodiments, in order to further improve the mold shifting braking effect and save energy, the mold shifting control method of the two-platen injection molding machine provided in the 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-plate injection molding machine is also 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 also controlled according to the set mold shifting speed.

[0143] In essence, both step S410 and step S420 control the mold shifting flow rate of the main oil circuit according to the mold shifting speed. The difference lies in whether the control is based on the mold shifting calculation speed or the mold shifting set 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 to avoid 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, in order to reduce the amount of data storage and improve the efficiency and accuracy of determining the mold shifting flow rate, in the above step S410, the step of controlling the mold shifting flow rate of the main oil circuit in the two-plate injection molding machine according to the mold shifting calculation 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 mold shifting piston rod diameter 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 in the mold shifting cylinder assembly.

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

[0150]

[0151]

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

[0153] For step S420, the principle of obtaining the mold shifting flow rate of the main oil circuit in the two-plate injection molding machine is the same as that of step S410, and any implementation method 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-plate 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 setting speed, the cylinder diameter of the mold shifting cylinder assembly and the mold shifting piston rod diameter 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 in 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] The embodiment of the present invention provides a mold shifting control method for a plate injection molding machine. If it is implemented in the form of a software function 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, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0159] The above-mentioned 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-plate 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 according to the current position of the movable platen and the maximum rated deceleration; When 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 of the movable platen, the opening of the mold shift proportional valve in the two-platen injection molding machine is controlled according to the calculated mold shift speed; In a case where the calculated mold shifting speed is greater than the set mold shifting speed, the opening of the mold shifting proportional valve in the two-platen injection molding machine is controlled according to the set mold shifting speed.

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-platen injection molding machine according to claim 2, characterized in that: The method further comprises: Determining, according to the maximum rated die 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 die shifting speed to zero; Determining a target deceleration distance of the moving plate according to the minimum deceleration distance and a set deceleration distance coefficient; The non-deceleration position range is determined according to the set mold shifting starting position of the movable mold plate and the target deceleration distance.

4. The mold shifting control method of a two-plate injection molding machine according to claim 3, characterized in that: The method further comprises: 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, the actual deceleration distance required by the movable platen is obtained; According to the actual deceleration distance and the set mold shifting end position, the target deceleration position range corresponding to the movable mold plate is determined.

5. The mold shifting control method of a two-platen injection molding machine according to any one of claims 1 to 4, 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 mold shift calculation speed comprises: Based on the mold shift calculation speed, a first mold shift control voltage value corresponding to the current position of the movable mold plate is calculated by using a pre-constructed linear function; controlling the opening of the mold shifting proportional valve in the two-plate injection molding machine according to the first mold shifting control voltage value; And / or, the step of controlling the opening of the mold shifting proportional valve in the two-platen injection molding machine according to the mold shifting setting speed comprises: The second mold shift control voltage value corresponding to the current position of the movable plate is calculated based on the mold shift setting speed by a pre-constructed linear function; The opening of the mold shifting proportional valve in the two-platen injection molding machine is controlled according to the second mold shifting control voltage value.

6. The mold shifting control method of a two-platen injection molding machine according to claim 5, characterized in that: 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 by taking 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.

7. The mold shifting control method of a two-platen injection molding machine according to claim 5, characterized in that: The linear function includes a mold opening linear function; and the construction process of the mold opening linear function includes: 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, the maximum rated mold opening speed of the movable platen is obtained; The mold opening linear function is constructed by taking the mold opening speed as the independent variable and the mold opening control voltage as the dependent variable 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.

8. The mold shifting control method of a two-platen injection molding machine according to claim 1, characterized in that: In the case where the mold shifting calculation speed is less than or equal to the mold shifting 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 mold shifting calculation speed; And / or, when the mold shifting calculation speed is greater than the mold shifting 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.

9. The mold shifting control method of a two-plate injection molding machine according to claim 1, characterized in that: The maximum rated deceleration includes the maximum mold closing rated deceleration and / or the maximum mold opening rated deceleration; The maximum rated deceleration of 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 of 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.

10. 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 described in any one of claims 1 to 9.

11. An electronic device, characterized in that: The invention comprises 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 method according to any one of claims 1 to 9.

12. 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 9 is implemented.

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