CN112895366B - Method and device for determining pressure maintaining position of injection molding machine - Google Patents
Method and device for determining pressure maintaining position of injection molding machine Download PDFInfo
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 339
- 238000000034 method Methods 0.000 title claims abstract description 146
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
- B29C2045/776—Measuring, controlling or regulating of velocity or pressure of moulding material determining the switchover point to the holding pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76856—De-compression after injection
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Abstract
The application relates to a pressure maintaining position determining method and a pressure maintaining position determining device of an injection molding machine, wherein the method comprises the following steps: in the process that the injection molding machine performs trial-manufacturing operation on a first mold, acquiring a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine, wherein the first pressure value is a pressure value detected by the pressure sensor in the process that the injection molding machine performs trial-manufacturing injection on the first mold; determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information; and determining a pressure rotating and maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold value, wherein the pressure rotating and maintaining position is used for indicating the position of the screw of the injection molding machine when the injection molding machine is controlled to be rotated from the injection process to the pressure maintaining process in the operation process of the injection molding machine. The application solves the technical problem that the accuracy of the pressure maintaining position determination of the injection molding machine is low.
Description
Technical Field
The application relates to the field of computers, in particular to a method and a device for determining a pressure rotating and maintaining position of an injection molding machine.
Background
The pressure maintaining process of the injection molding machine can refer to parameters with time, pressure, position and speed, and the injection process of the injection molding machine can be converted into the pressure maintaining process after the starting parameters meet the requirements. At present, the parameters are time and position, if the parameters are time, the maximum time of the injection process can be set, and when the injection process is overtime, the injection molding machine performs pressure maintaining. If the parameter is the position, the pressure maintaining position is set, and when the position is reached, the pressure maintaining process is switched to. And the mode that the position was regarded as changeing the pressurize condition, need debugging personnel to have accurate estimation to the die cavity volume of mould, or trial production many times, just can learn the exact position of being full of to change the pressurize, the change pressurize position that the mode of confirming at present changeing the pressurize position was confirmed is inaccurate, can cause unchangeable, the reduction of efficiency and the extravagant scheduling problem of material of debugging.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The application provides a method and a device for determining a pressure transferring and maintaining position of an injection molding machine, which are used for at least solving the technical problem of low accuracy of determining the pressure transferring and maintaining position of the injection molding machine in the related technology.
According to an aspect of an embodiment of the present application, there is provided a method of determining a transfer pressure position of an injection molding machine, including:
optionally, acquiring a first pressure value output by a pressure sensor mounted on a screw of the injection molding machine, where the first attribute information of the injection molding machine and the second attribute information of the material filled in the injection molding machine include:
determining the first attribute information and the second attribute information, wherein the first attribute information comprises: the cross-sectional area of an outlet of a charging barrel of the injection molding machine, the cross-sectional area of a screw of the injection molding machine, the injection speed of the screw of the injection molding machine, the mass of the screw of the injection molding machine, the injection acceleration of the screw of the injection molding machine, and the second attribute information includes the density of a material filled by the injection molding machine;
reading the first pressure value detected by the pressure sensor.
Optionally, determining a second pressure value of a cartridge outlet of the injection molding machine according to the first pressure value, the first attribute information, and the second attribute information comprises:
determining the second pressure value by the following equation:
wherein F is the first pressure value, rho is the density of the material filled by the injection molding machine, and S0Is the cross-sectional area, S, of the outlet of the barrel of the injection molding machine1Is the cross-sectional area of the screw of the injection molding machine, vsIs the injection speed of the screw of the injection molding machine, m0Is the mass of the screw of the injection molding machine, a is the injection acceleration of the screw of the injection molding machine, F1Is the second pressure value.
Optionally, determining a pressure rotating and maintaining position corresponding to a screw of the injection molding machine according to the second pressure value and the pressure threshold value includes:
detecting whether the second pressure value reaches the pressure threshold value;
and determining the pressure transferring and maintaining position according to the current position of the screw of the injection molding machine under the condition that the second pressure value reaches the pressure threshold value.
Optionally, the determining the pressure maintaining position according to the current position of the screw of the injection molding machine comprises:
determining the current position of the screw of the injection molding machine as an initial pressure rotating and maintaining position, and repeatedly executing the following steps until the pressure rotating and maintaining position is obtained:
controlling the injection molding machine to perform trial production operation on the first mold again, and acquiring a third pressure value when the screw of the injection molding machine reaches the initial pressure maintaining position;
determining the initial pressure transferring and maintaining position as the pressure transferring and maintaining position under the condition that the difference value between the third pressure value and the pressure threshold value falls into a target pressure range;
and under the condition that the difference value between the third pressure value and the pressure threshold value does not fall into the target pressure range, determining the position of a screw of the injection molding machine as the next initial rotation pressure maintaining position when the pressure value of the outlet of a charging barrel of the injection molding machine reaches the pressure threshold value.
Optionally, in the process of performing trial-manufacturing operation on the first mold by the injection molding machine, before acquiring a first pressure value output by a pressure sensor mounted on a screw of the injection molding machine, first attribute information of the injection molding machine, and second attribute information of a material filled in the injection molding machine, the method further includes:
detecting whether a mould corresponding to the injection molding machine is replaced or not;
and controlling the injection molding machine to perform trial manufacturing operation on the first mold under the condition that the mold corresponding to the injection molding machine is detected to be replaced by the first mold from the second mold.
Optionally, after determining a pressure rotating and holding position corresponding to a screw of the injection molding machine according to the second pressure value and the pressure threshold value, the method further includes:
in the operation process of the injection molding machine, under the condition that a screw of the injection molding machine is detected to reach the pressure maintaining position, controlling the injection molding machine to be switched from the injection process to the pressure maintaining process;
acquiring a first pressure curve corresponding to the pressure of a screw of the injection molding machine in the operation process of the injection molding machine;
determining the deviation degree of the first pressure curve relative to a second pressure curve, wherein the second pressure curve is obtained by counting the pressure of a screw of the injection molding machine in the historical operation process of the injection molding machine;
determining that there is a quality problem with the object in the first mold if the degree of deviation is greater than or equal to a threshold degree of deviation.
According to another aspect of the embodiments of the present application, there is also provided a rotary pressure maintaining position determining apparatus of an injection molding machine, including:
the injection molding machine comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine in the process of trial production operation of the injection molding machine on a first mold, and the first pressure value is detected by the pressure sensor in the process of trial production injection of the injection molding machine on the first mold;
the first determining module is used for determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information;
and the second determining module is used for determining a pressure rotating and maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold value, wherein the pressure rotating and maintaining position is used for indicating the position of the screw of the injection molding machine when the injection molding machine is controlled to be rotated from the injection process to the pressure maintaining process in the operation process of the injection molding machine.
According to another aspect of the embodiments of the present application, there is also provided a storage medium including a stored program which, when executed, performs the above-described method.
According to another aspect of the embodiments of the present application, there is also provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the above method through the computer program.
In the embodiment of the application, a first pressure value output by a pressure sensor installed on a screw of an injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine are obtained in the process that the injection molding machine performs trial-manufacturing operation on a first mold, wherein the first pressure value is a pressure value detected by the pressure sensor in the process that the injection molding machine performs trial-manufacturing injection on the first mold; determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information; determining a rotating and pressure maintaining position corresponding to a screw of the injection molding machine according to the second pressure value and the pressure threshold value, wherein, the pressure maintaining position is used for indicating the mode of controlling the position of a screw of the injection molding machine when the injection molding machine is switched from the injection process to the pressure maintaining process in the operation process of the injection molding machine, the second pressure value of the outlet of the charging barrel of the injection molding machine is determined through the first pressure value output by a pressure sensor arranged on a screw rod of the injection molding machine, the first attribute information of the injection molding machine and the second attribute information of the material filled in the injection molding machine, so that the real pressure in the injection molding machine is accurately determined, the position parameter of the screw for controlling the injection molding machine to be converted from the injection process to the pressure maintaining process is determined according to the true pressure value, so that the aim of accurately determining the pressure maintaining position is fulfilled, therefore, the technical effect of improving the accuracy of the determination of the pressure maintaining position of the injection molding machine is achieved, and the technical problem that the accuracy of the determination of the pressure maintaining position of the injection molding machine is low is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic diagram of a hardware environment of a rotary pressure maintaining position determining method of an injection molding machine according to an embodiment of the present application;
FIG. 2 is a flow chart of an alternative method of determining a dwell position of an injection molding machine according to an embodiment of the present application;
FIG. 3 is a schematic view of an alternative injection molding machine screw and barrel configuration according to embodiments of the present application;
FIG. 4 is a schematic diagram of an alternative process for determining a transfer dwell position of a molding machine in accordance with embodiments of the present application;
FIG. 5 is a schematic diagram of an alternative injection molding machine control process according to an embodiment of the present application;
FIG. 6 is a schematic view of an alternative rotary dwell position determining arrangement of an injection molding machine according to an embodiment of the present application;
fig. 7 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an aspect of embodiments of the present application, there is provided embodiments of a method for determining a rotary pressure maintaining position of an injection molding machine.
Alternatively, in the present embodiment, the above-described method for determining the transfer pressure position of the injection molding machine may be applied to a hardware environment constituted by the control apparatus 101 and the injection molding machine 103 as shown in fig. 1. As shown in fig. 1, a control device 101 is connected to an injection molding machine 103 via a network, which may be used to provide control services to the injection molding machine 103, including but not limited to: the wide area network, the metropolitan area network, or the local area network, and the control device 101 is not limited to a PC, a mobile phone, a tablet computer, or the like. The method for determining the pressure maintaining position of the injection molding machine according to the embodiment of the present application may be executed by the control device 101. Here, the control device 101 may execute the method for determining the pressure maintaining position of the injection molding machine according to the embodiment of the present application by a client installed thereon.
Fig. 2 is a flow chart of an alternative method for determining a transfer pressure location of an injection molding machine according to an embodiment of the present application, which may include the steps of, as shown in fig. 2:
step S202, in the process that an injection molding machine performs trial-manufacturing operation on a first mold, obtaining a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine, wherein the first pressure value is a pressure value detected by the pressure sensor in the process that the injection molding machine performs trial-manufacturing injection on the first mold;
step S204, determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information;
and S206, determining a pressure rotating and maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold, wherein the pressure rotating and maintaining position is used for indicating the position of the screw of the injection molding machine when the injection molding machine is controlled to be rotated from the injection process to the pressure maintaining process in the operation process of the injection molding machine.
Through the steps S202 to S206, the second pressure value of the outlet of the charging barrel of the injection molding machine is determined through the first pressure value output by the pressure sensor installed on the screw rod of the injection molding machine and the first attribute information of the injection molding machine and the second attribute information of the material filled in the injection molding machine, so that the real pressure inside the injection molding machine is accurately determined, the position parameter of the screw rod used for controlling the injection molding machine to be converted from the injection process to the pressure maintaining process is determined according to the real pressure value, the purpose of accurately determining the pressure maintaining position is achieved, the technical effect of improving the accuracy of determining the pressure maintaining position of the injection molding machine is achieved, and the technical problem that the accuracy of determining the pressure maintaining position of the injection molding machine is low is solved.
In the technical solution provided in step S202, the injection molding machine is also called an injection molding machine, and its working principle lies in injecting the molten material into the mold cavity through the screw rod in the charging barrel in an injection manner, so as to cool and mold and produce the product, after the injection stage is finished, the molten material is gradually cooled, and often expands with heat and contracts with cold, which results in that the product quality does not meet the requirements. Therefore, the pressure is usually maintained for a certain period of time after injection, so that the pressure is always constant during the expansion and contraction process, which is called the pressure maintaining process. The transition from the injection process to the dwell process is referred to as the transition dwell.
Fig. 3 is a schematic diagram of an alternative screw and barrel structure of an injection molding machine according to an embodiment of the present application, as shown in fig. 3, 1 is an injection outlet of the barrel, the cross-sectional area of the outlet is S0, 2 is a screw injection head, the cross-sectional area of the screw injection head is S1, 3 is a screw, the mass is m0, 4 is a pressure sensor, S0, S1, and m0 are configured when the machine tool leaves the factory, an operator inputs the melt density of the material before use, the system can be automatically modeled, and an accurate value of the pressure at 1 (i.e., a second pressure value) is obtained according to a value (i.e., a first pressure value) of the pressure sensor.
Alternatively, in this embodiment, the pressure sensor mounted on the screw of the injection molding machine may be, but is not limited to, any location on the screw of the injection molding machine capable of detecting the pressure received by the screw of the injection molding machine during the operation of the mold by the injection molding machine, such as: the rear end of the screw of the injection molding machine.
Optionally, in this embodiment, the first pressure value, the first attribute information, and the second attribute information may be obtained by, but are not limited to:
s11, determining the first attribute information and the second attribute information, wherein the first attribute information includes: the cross-sectional area of an outlet of a charging barrel of the injection molding machine, the cross-sectional area of a screw of the injection molding machine, the injection speed of the screw of the injection molding machine, the mass of the screw of the injection molding machine, the injection acceleration of the screw of the injection molding machine, and the second attribute information includes the density of a material filled by the injection molding machine;
and S12, reading the first pressure value detected by the pressure sensor.
Alternatively, in the present embodiment, the first attribute information of the injection molding machine may include, but is not limited to, a cross-sectional area S of a cartridge outlet of the injection molding machine0Cross-sectional area S of screw of injection molding machine1Injection speed v of the screw of the injection molding machinesMass m of screw of injection molding machine0Injection acceleration a of the screw of the injection molding machine.
Alternatively, in the present embodiment, the second attribute information of the material filled by the injection molding machine may include, but is not limited to, a density ρ of the material filled by the injection molding machine.
As an optional embodiment, in the process of performing a trial-manufacturing operation on a first mold by an injection molding machine, acquiring a first pressure value output by a pressure sensor mounted on a screw of the injection molding machine, and before first attribute information of the injection molding machine and second attribute information of a material filled by the injection molding machine, the method further includes:
s21, detecting whether the mould corresponding to the injection molding machine is replaced;
and S22, controlling the injection molding machine to perform trial manufacturing operation on the first mold under the condition that the mold corresponding to the injection molding machine is detected to be replaced by the first mold from the second mold.
Alternatively, in the present embodiment, each time the mold on the injection molding machine is replaced, the injection molding machine is controlled to perform a trial production operation on a new mold to re-determine the rotary pressure maintaining position suitable for the new mold.
In the technical scheme provided by the step S204, the second pressure value of the outlet of the charging barrel of the injection molding machine is accurately determined through the first pressure value detected by the screw of the injection molding machine, the first attribute information of the injection molding machine and the second attribute information of the material filled in the injection molding machine.
Optionally, in this embodiment, the second pressure value may be determined by, but is not limited to, the following formula:
wherein F is the first pressure value, rho is the density of the material filled by the injection molding machine, and S0Is the cross-sectional area, S, of the outlet of the barrel of the injection molding machine1Is the cross-sectional area of the screw of the injection molding machine, vsIs the injection speed of the screw of the injection molding machine, m0Is the mass of the screw of the injection molding machine, a is the injection acceleration of the screw of the injection molding machine, F1Is the second pressure value.
Optionally, in this embodiment, the inverse process of the above formula is as follows: when the material in the mold is not full in the injection process, the injection of the material in the injection molding machine is not obstructed, so the material can be used as fluid for analysis, the frictional resistance of the fluid is assumed to be ignored, and the advancing speed of the screw is set as vsThe section area of the charging barrel is S1The pressure is F, the cross-sectional area of the injection hole is S0Then, the flow velocity v of the material injection outlet can be obtained by the formula (1)p。
And is provided with
M ═ ρ v in unit time dtpS0dt (3)
v＝vp (4)
x＝vs·dt (5)
The equations (3), (4) and (5) are substituted into (2) to obtain
Substituting the formula (1) into the formula (6) to obtain
Where ρ is the density of the material in the molten state, which is considered constant during injection, it can be seen from equation (7) that the force experienced by the screw in this state is proportional to the square of the current screw speed.
Taking into account the acceleration of the screw
Wherein m is0Is the mass of the screw, a is the acceleration of the screw, F1The pressure to which the cartridge outlet is subjected (i.e. the second pressure value). The value of the pressure sensor (i.e. the first pressure value) can thus be used to obtain the actual pressure value at the outlet of the cartridge.
In the technical solution provided in step S206, the pressure threshold may be, but is not limited to, preset.
Alternatively, in the present embodiment, the obtained pressure maintaining position is used to indicate the position of the screw of the injection molding machine at the time of controlling the injection molding machine to shift from the injection process to the pressure maintaining process during the operation of the injection molding machine.
As an alternative embodiment, determining the rotation and pressure maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold value includes:
s31, detecting whether the second pressure value reaches the pressure threshold value;
and S32, determining the pressure transferring and maintaining position according to the current position of the screw of the injection molding machine when the second pressure value reaches the pressure threshold value.
Alternatively, in the present embodiment, the pressure maintaining position is determined by detecting a position at which a screw of the injection molding machine is currently located when the second pressure value of the outlet of the cartridge reaches the pressure threshold value during the trial production operation of the first mold by the injection molding machine.
Optionally, in this embodiment, the current position of the screw of the injection molding machine when the second pressure value reaches the pressure threshold may be directly determined as the pressure rotation and holding position, or the final pressure rotation and holding position may be determined through multiple times of debugging according to the current position of the screw of the injection molding machine when the second pressure value reaches the pressure threshold.
Alternatively, in the present embodiment, the pressure maintaining position may be determined by, but is not limited to: determining the current position of the screw of the injection molding machine as an initial pressure rotating and maintaining position, and repeatedly executing the following steps until the pressure rotating and maintaining position is obtained:
s41, controlling the injection molding machine to perform trial production operation on the first mold again, and acquiring a third pressure value when the screw of the injection molding machine reaches the initial pressure maintaining position;
s42, determining the initial pressure-transferring position as the pressure-transferring position when the difference between the third pressure value and the pressure threshold value falls within a target pressure range;
and S43, determining the position of the screw of the injection molding machine when the pressure value of the outlet of the charging barrel of the injection molding machine reaches the pressure threshold value as the next initial rotating and pressure maintaining position under the condition that the difference value between the third pressure value and the pressure threshold value does not fall into the target pressure range.
Optionally, in this embodiment, the current position of the screw of the injection molding machine when the second pressure value reaches the pressure threshold is determined as the first initial pressure rotating and maintaining position, and the initial pressure rotating and maintaining position may be repeatedly corrected through another trial manufacturing process until a more accurate pressure rotating and maintaining position is obtained.
Fig. 4 is a schematic diagram of an alternative process for determining a pressure maintaining position of a molding machine according to an embodiment of the present application, and as shown in fig. 4, when a mold is replaced, the mold is set in a system to be replaced, then a pressure peak value (i.e., the above pressure threshold value) in a mold cavity is set next time, a real pressure (i.e., a second pressure value) obtained during next injection is detected, when the pressure peak value is reached, the mold is considered to be full, a current position is recorded, trial production is performed again, deceleration is performed before the position is reached, if a current pressure value (i.e., the above third pressure value) of the current position is within an error range from a previous pressure peak value, debugging is completed, otherwise, a new position is used to correct the previous position. And repeating the process to complete the automatic setting of the pressure maintaining position parameters.
As an alternative embodiment, after determining the rotation and pressure holding position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold, the method further includes:
s51, in the operation process of the injection molding machine, under the condition that the screw of the injection molding machine is detected to reach the pressure maintaining position, controlling the injection molding machine to be switched from the injection process to the pressure maintaining process;
s52, acquiring a first pressure curve corresponding to the pressure of a screw of the injection molding machine in the operation process of the injection molding machine;
s53, determining the deviation degree of the first pressure curve relative to a second pressure curve, wherein the second pressure curve is a pressure curve obtained by counting the pressure of a screw of the injection molding machine in the historical operation process of the injection molding machine;
and S54, determining that the object in the first die has quality problems when the deviation degree is larger than or equal to a deviation degree threshold value.
Alternatively, in this embodiment, after the pressure maintaining position is obtained, the pressure maintaining position may be used to control the injection molding machine to switch from the injection process to the pressure maintaining process during the operation of the injection molding machine.
Optionally, in this embodiment, it may be automatically detected whether the quality problem exists in the currently produced product according to the historical pressure curve during the process of controlling the injection molding machine to switch from the injection process to the pressure maintaining process.
Alternatively, in the present embodiment, since the volumes and shapes of the cavities in the same mold are the same, the pressure variation curves during the injection process are substantially the same, and if the pressure variation curves are different, it can be considered that the currently produced product may encounter an unknown quality problem, so that the automatic detection of the product quality can be realized. The database may, but is not limited to, establish a correspondence between the mold and the pressure curve, and the second pressure curve for comparison with the currently actually obtained first pressure curve may, but is not limited to, correspond to the first mold.
FIG. 5 is a schematic diagram of an alternative injection molding machine control process according to an embodiment of the present application, as shown in FIG. 5, in an automatic mode, the actual pressure value of the mold cavity can be obtained by the above process, and the pressure curve data of each injection is recorded; and setting a plurality of time points, comparing whether the pressure at the time points is larger than the previous pressure after each injection is finished, if the difference is within an error range and the mould is not replaced, determining that the current product has no larger quality problem, and if the difference is too large, determining that the current produced product may have certain quality problems. The second pressure curve, which is a standard curve, can also be corrected during the test process as a function of the current actual first pressure curve.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling an electronic device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.
According to another aspect of the embodiments of the present application, there is also provided a rotary holding pressure position determining device of an injection molding machine for implementing the rotary holding pressure position determining method of an injection molding machine described above. Fig. 6 is a schematic view of an alternative pressure maintaining position determining apparatus of an injection molding machine according to an embodiment of the present application, which may include, as shown in fig. 6:
the first obtaining module 62 is configured to obtain a first pressure value output by a pressure sensor mounted on a screw of an injection molding machine, first attribute information of the injection molding machine, and second attribute information of a material filled in the injection molding machine, in a process of performing a trial injection operation on a first mold by the injection molding machine, where the first pressure value is a pressure value detected by the pressure sensor in the process of performing the trial injection on the first mold by the injection molding machine;
a first determining module 64, configured to determine a second pressure value of the outlet of the barrel of the injection molding machine according to the first pressure value, the first attribute information, and the second attribute information;
and a second determining module 66, configured to determine, according to the second pressure value and the pressure threshold, a pressure rotating and maintaining position corresponding to the screw of the injection molding machine, where the pressure rotating and maintaining position is used to indicate a position of the screw of the injection molding machine when the injection molding machine is controlled to change from an injection process to a pressure maintaining process in an operation process of the injection molding machine.
It should be noted that the first obtaining module 62 in this embodiment may be configured to execute step S202 in this embodiment, the first determining module 64 in this embodiment may be configured to execute step S204 in this embodiment, and the second determining module 66 in this embodiment may be configured to execute step S206 in this embodiment.
It should be noted here that the modules described above are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above embodiments. It should be noted that the modules described above as a part of the apparatus may operate in a hardware environment as shown in fig. 1, and may be implemented by software or hardware.
Through the module, the first pressure value of the pressure sensor output through installation on the screw rod of injection molding machine, the second pressure value of the feed cylinder export of injection molding machine is confirmed to the first attribute information of injection molding machine and the second attribute information of the material that the injection molding machine was filled, thereby the inside true pressure of injection molding machine is accurately determined, the position parameter that is used for controlling the injection molding machine to trun into the screw rod of pressurize process by the injection process according to this true pressure value, the purpose of accurate determination commentaries on classics pressurize position has been reached, thereby the technological effect of the degree of accuracy of commentaries on classics pressurize position determination of improvement injection molding machine has been realized, and then the lower technical problem of the degree of accuracy of commentaries on classics pressurize position determination of injection molding machine has been solved.
As an alternative embodiment, the first obtaining module includes:
a first determining unit, configured to determine the first attribute information and the second attribute information, wherein the first attribute information includes: the cross-sectional area of an outlet of a charging barrel of the injection molding machine, the cross-sectional area of a screw of the injection molding machine, the injection speed of the screw of the injection molding machine, the mass of the screw of the injection molding machine, the injection acceleration of the screw of the injection molding machine, and the second attribute information includes the density of a material filled by the injection molding machine;
and the reading unit is used for reading the first pressure value detected by the pressure sensor.
As an alternative embodiment, the first determining module includes:
a second determination unit for determining the second pressure value by the following formula:
wherein F is the first pressure value, rho is the density of the material filled by the injection molding machine, and S0Is the cross-sectional area, S, of the outlet of the barrel of the injection molding machine1Is the cross-sectional area of the screw of the injection molding machine, vsIs the injection speed of the screw of the injection molding machine, m0Is the mass of the screw of the injection molding machine, a is the injection acceleration of the screw of the injection molding machine, F1Is the second pressure value.
As an alternative embodiment, the second determining module includes:
a detection unit for detecting whether the second pressure value reaches the pressure threshold value;
and the third determining unit is used for determining the pressure transferring and maintaining position according to the current position of the screw of the injection molding machine under the condition that the second pressure value reaches the pressure threshold value.
As an alternative embodiment, the third determining unit is configured to:
determining the current position of the screw of the injection molding machine as an initial pressure rotating and maintaining position, and repeatedly executing the following steps until the pressure rotating and maintaining position is obtained:
controlling the injection molding machine to perform trial production operation on the first mold again, and acquiring a third pressure value when the screw of the injection molding machine reaches the initial pressure maintaining position;
determining the initial pressure transferring and maintaining position as the pressure transferring and maintaining position under the condition that the difference value between the third pressure value and the pressure threshold value falls into a target pressure range;
and under the condition that the difference value between the third pressure value and the pressure threshold value does not fall into the target pressure range, determining the position of a screw of the injection molding machine as the next initial rotation pressure maintaining position when the pressure value of the outlet of a charging barrel of the injection molding machine reaches the pressure threshold value.
As an alternative embodiment, the apparatus further comprises:
the detection module is used for acquiring a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine in the process that the injection molding machine performs trial production operation on a first mold, and detecting whether the mold corresponding to the injection molding machine is replaced or not before first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine;
and the first control module is used for controlling the injection molding machine to perform trial production operation on the first mold under the condition that the mold corresponding to the injection molding machine is detected to be replaced by the first mold from the second mold.
As an alternative embodiment, the apparatus further comprises:
the second control module is used for controlling the injection molding machine to be converted into a pressure maintaining process from an injection process under the condition that the screw of the injection molding machine is detected to reach the pressure maintaining position in the operation process of the injection molding machine after the pressure maintaining position corresponding to the screw of the injection molding machine is determined according to the second pressure value and the pressure threshold value;
the second acquisition module is used for acquiring a first pressure curve corresponding to the pressure of a screw of the injection molding machine in the operation process of the injection molding machine;
the third determining module is used for determining the deviation degree of the first pressure curve relative to a second pressure curve, wherein the second pressure curve is obtained by counting the pressure of a screw of the injection molding machine in the historical operation process of the injection molding machine;
and the fourth determination module is used for determining that the object in the first die has quality problems when the deviation degree is greater than or equal to a deviation degree threshold value.
It should be noted here that the modules described above are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above embodiments. It should be noted that the modules described above as a part of the apparatus may be operated in a hardware environment as shown in fig. 1, and may be implemented by software, or may be implemented by hardware, where the hardware environment includes a network environment.
According to another aspect of the embodiments of the present application, there is also provided an electronic device for implementing the method of determining a pressure maintaining position of an injection molding machine.
Fig. 7 is a block diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 7, the electronic device may include: one or more processors 701 (only one of which is shown), a memory 703, and a transmission apparatus 705, which may also include an input/output device 707, as shown in fig. 7.
The memory 703 may be used to store software programs and modules, such as program instructions/modules corresponding to the method and apparatus for determining a pressure maintaining position of an injection molding machine in the embodiment of the present application, and the processor 701 executes various functional applications and data processing by running the software programs and modules stored in the memory 703, so as to implement the method for determining a pressure maintaining position of an injection molding machine. The memory 703 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, the memory 703 may further include memory located remotely from the processor 701, which may be connected to electronic devices through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 705 is used for receiving or transmitting data via a network, and may also be used for data transmission between a processor and a memory. Examples of the network may include a wired network and a wireless network. In one example, the transmission device 705 includes a Network adapter (NIC) that can be connected to a router via a Network cable and other Network devices to communicate with the internet or a local area Network. In one example, the transmission device 705 is a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
Among other things, the memory 703 is used to store application programs.
The processor 701 may call the application program stored in the memory 703 through the transmission means 705 to perform the following steps:
in the process that an injection molding machine performs trial-manufacturing operation on a first mold, acquiring a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine, wherein the first pressure value is a pressure value detected by the pressure sensor in the process that the injection molding machine performs trial-manufacturing injection on the first mold;
determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information;
and determining a pressure rotating and maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold, wherein the pressure rotating and maintaining position is used for indicating the position of the screw of the injection molding machine when the injection molding machine is controlled to be rotated from the injection process to the pressure maintaining process in the operation process of the injection molding machine.
By adopting the embodiment of the application, the scheme for determining the pressure rotating and maintaining position of the injection molding machine is provided. The first pressure value of pressure sensor output through installation on the screw rod of injection molding machine, the second pressure value of the feed cylinder export of injection molding machine is confirmed to the first attribute information of injection molding machine and the second attribute information of the material that the injection molding machine was filled, thereby the inside true pressure of injection molding machine is accurately determined, confirm the position parameter who is used for controlling the injection molding machine to trun into the screw rod of pressurize process by the injection process according to this true pressure value, the purpose of accurate definite commentaries on classics pressurize position has been reached, thereby the technological effect of the degree of accuracy that the commentaries on classics pressurize position of improvement injection molding machine is confirmed has been realized, and then the lower technical problem of the degree of accuracy of the commentaries on classics pressurize position of injection molding machine is confirmed has been solved.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment is not described herein again.
It will be understood by those skilled in the art that the structure shown in fig. 7 is merely an illustration, and the electronic device may be a smart phone (e.g., an Android phone, an iOS phone, etc.), a tablet computer, a palm computer, and a Mobile Internet Device (MID), a PAD, etc. Fig. 7 is a diagram illustrating a structure of the electronic device. For example, the electronic device may also include more or fewer components (e.g., network interfaces, display devices, etc.) than shown in FIG. 7, or have a different configuration than shown in FIG. 7.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by a program for instructing hardware associated with an electronic device, where the program may be stored in a computer-readable storage medium, and the storage medium may include: flash disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
Embodiments of the present application also provide a storage medium. Alternatively, in the present embodiment, the above-described storage medium may be used for a program code for executing a transfer pressure position determination method of an injection molding machine.
Optionally, in this embodiment, the storage medium may be located on at least one of a plurality of network devices in a network shown in the above embodiment.
Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:
in the process that an injection molding machine performs trial-manufacturing operation on a first mold, acquiring a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine, wherein the first pressure value is a pressure value detected by the pressure sensor in the process that the injection molding machine performs trial-manufacturing injection on the first mold;
determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information;
and determining a pressure rotating and maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold, wherein the pressure rotating and maintaining position is used for indicating the position of the screw of the injection molding machine when the injection molding machine is controlled to be rotated from the injection process to the pressure maintaining process in the operation process of the injection molding machine.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment is not described herein again.
Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
The integrated unit in the above embodiments, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in the above computer-readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including instructions for causing one or more computer devices (which may be personal computers, servers, network devices, or the like) to execute all or part of the steps of the method described in the embodiments of the present application.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (8)
1. A method for determining a pressure maintaining position of an injection molding machine, comprising:
in the process that an injection molding machine performs trial-manufacturing operation on a first mold, acquiring a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine, wherein the first pressure value is a pressure value detected by the pressure sensor in the process that the injection molding machine performs trial-manufacturing injection on the first mold;
determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information;
determining a pressure rotating and maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold value, wherein the pressure rotating and maintaining position is used for indicating the position of the screw of the injection molding machine when the injection molding machine is controlled to be rotated from an injection process to a pressure maintaining process in the operation process of the injection molding machine;
acquiring a first pressure value output by a pressure sensor installed on a screw of the injection molding machine, wherein the first attribute information of the injection molding machine and the second attribute information of the material filled in the injection molding machine comprise: determining the first attribute information and the second attribute information, wherein the first attribute information comprises: the cross-sectional area of an outlet of a charging barrel of the injection molding machine, the cross-sectional area of a screw of the injection molding machine, the injection speed of the screw of the injection molding machine, the mass of the screw of the injection molding machine, the injection acceleration of the screw of the injection molding machine, and the second attribute information includes the density of a material filled by the injection molding machine; reading the first pressure value detected by the pressure sensor;
determining a second pressure value of a barrel outlet of the injection molding machine according to the first pressure value, the first attribute information, and the second attribute information comprises: determining the second pressure value by the following equation:
wherein F is the first pressure value, rho is the density of the material filled by the injection molding machine, and S0Is the cross-sectional area, S, of the outlet of the barrel of the injection molding machine1Is the cross-sectional area of the screw of the injection molding machine, vsIs the injection speed of the screw of the injection molding machine, m0Is the mass of the screw of the injection molding machine, a is the injection acceleration of the screw of the injection molding machine, F1Is the second pressure value.
2. The method of claim 1, wherein determining a corresponding rotary dwell position for a screw of the injection molding machine based on the second pressure value and a pressure threshold value comprises:
detecting whether the second pressure value reaches the pressure threshold value;
and determining the pressure transferring and maintaining position according to the current position of the screw of the injection molding machine under the condition that the second pressure value reaches the pressure threshold value.
3. The method of claim 2, wherein determining the rotary pressure holding position based on a position at which a screw of the injection molding machine is currently located comprises:
determining the current position of the screw of the injection molding machine as an initial pressure rotating and maintaining position, and repeatedly executing the following steps until the pressure rotating and maintaining position is obtained:
controlling the injection molding machine to perform trial production operation on the first mold again, and acquiring a third pressure value when the screw of the injection molding machine reaches the initial pressure maintaining position;
determining the initial pressure transferring and maintaining position as the pressure transferring and maintaining position under the condition that the difference value between the third pressure value and the pressure threshold value falls into a target pressure range;
and under the condition that the difference value between the third pressure value and the pressure threshold value does not fall into the target pressure range, determining the position of a screw of the injection molding machine as the next initial rotation pressure maintaining position when the pressure value of the outlet of a charging barrel of the injection molding machine reaches the pressure threshold value.
4. The method of claim 1, wherein the method further comprises, during the trial-and-error operation of the injection molding machine on the first mold, acquiring a first pressure value output by a pressure sensor mounted on a screw of the injection molding machine, first attribute information of the injection molding machine, and second attribute information of a material filled in the injection molding machine, before:
detecting whether a mould corresponding to the injection molding machine is replaced or not;
and controlling the injection molding machine to perform trial manufacturing operation on the first mold under the condition that the mold corresponding to the injection molding machine is detected to be replaced by the first mold from the second mold.
5. The method of claim 1, wherein after determining a corresponding rotary packing position of a screw of the injection molding machine based on the second pressure value and a pressure threshold, the method further comprises:
in the operation process of the injection molding machine, under the condition that a screw of the injection molding machine is detected to reach the pressure maintaining position, controlling the injection molding machine to be switched from the injection process to the pressure maintaining process;
acquiring a first pressure curve corresponding to the pressure of a screw of the injection molding machine in the operation process of the injection molding machine;
determining the deviation degree of the first pressure curve relative to a second pressure curve, wherein the second pressure curve is obtained by counting the pressure of a screw of the injection molding machine in the historical operation process of the injection molding machine;
determining that there is a quality problem with the object in the first mold if the degree of deviation is greater than or equal to a threshold degree of deviation.
6. A rotary pressure maintaining position determining device of an injection molding machine is characterized by comprising:
the injection molding machine comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring a first pressure value output by a pressure sensor arranged on a screw of the injection molding machine, first attribute information of the injection molding machine and second attribute information of a material filled in the injection molding machine in the process of trial production operation of the injection molding machine on a first mold, and the first pressure value is detected by the pressure sensor in the process of trial production injection of the injection molding machine on the first mold;
the first determining module is used for determining a second pressure value of the outlet of the charging barrel of the injection molding machine according to the first pressure value, the first attribute information and the second attribute information;
and the second determining module is used for determining a pressure rotating and maintaining position corresponding to the screw of the injection molding machine according to the second pressure value and the pressure threshold value, wherein the pressure rotating and maintaining position is used for indicating the position of the screw of the injection molding machine when the injection molding machine is controlled to be rotated from the injection process to the pressure maintaining process in the operation process of the injection molding machine.
7. A storage medium, characterized in that the storage medium comprises a stored program, wherein the program when executed performs the method of any of the preceding claims 1 to 5.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the method of any of the preceding claims 1 to 5 by means of the computer program.
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| JP3619431B2 (en) * | 2000-07-18 | 2005-02-09 | 日精樹脂工業株式会社 | Control method of injection molding machine |
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| JP4763081B1 (en) * | 2010-02-26 | 2011-08-31 | ファナック株式会社 | Injection molding machine having weighing back pressure setting means |
| CN209036848U (en) * | 2018-11-14 | 2019-06-28 | 安徽世界村智能装备有限公司 | A kind of rubber dual density product foam-in-mould formation system |
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| CN1055505A (en) * | 1990-03-05 | 1991-10-23 | 株工会社小松制作所 | The detection method of injection-mold machine resin characteristic and injection control method |
| US5997778A (en) * | 1998-04-23 | 1999-12-07 | Van Dorn Demag Corporation | Auto-tuned, adaptive process controlled, injection molding machine |
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