TWI619596B - Cross-machine injection molding parameter conversion method and system - Google Patents

Abstract

A cross-machine injection molding parameter conversion system, wherein the parameter conversion method performed comprises the following steps: obtaining mold parameters, material parameters, machine parameters, and process parameters of the transfer machine and the transfer machine, and then selecting the same a process parameter, and set a plurality of set values corresponding to the transfer machine and the transfer machine, and perform actual operations on the transfer machine and the transfer machine to obtain the corresponding actual work values, and then calculate The compensation function between the set value and the actual work value allows the user to use the compensation function to convert the original process parameters transferred out of the machine to the converted process parameters transferred to the machine, thereby calculating more accurately Transfer the correct process parameters to the machine and shorten the test mode adjustment time.

Description

Cross-machine injection molding parameter conversion method and system

The invention relates to the process parameters of the injection molding machine, in particular to a method and system for converting process parameters between the injection machine from which the mold is transferred and the injection machine into which the mold is transferred during the production of the change line.

When the injection molding machine is used for line change production, the same mold is moved from the machine to the machine that is transferred to the machine to be transferred, and the mold is re-tested. After the test is successful, a qualified product can be produced. Traditionally, in the trial-testing process, the adjustment of various process parameters such as injection molding machine and mold has been carried out by the experience of the master. However, the process parameters that need to be adjusted are quite numerous, and the specifications of different types of injection machines are required. It is also quite different from the parameters of the machine. It is easy to make errors due to the adjustment of the parameters of the master. The adjustment time is too long, and there will be problems that are difficult to pass on.

The invention patent No. 103085231 provides an adjustment method of the injection molding machine, which firstly converts the mold parameters, material parameters of the mold, and the process parameters of the debugged injection machine into a standard process parameter, and then The converted standard process parameters are then correspondingly converted to various parameters of the debugged injection machine applicable to the same mold, and finally adjusted according to these parameters. However, this patent only considers the standard specifications and machine parameters between different injection machines, and does not take into account the error that the injection machine can produce after prolonged use. The problem that causes the converted process parameters usually still requires multiple adjustments, and there are still considerable problems in use.

In contrast, the present invention provides a novel conversion method for injection molding parameters that can more accurately calculate process parameters for the mold to be transferred into the machine during line change production.

In order to achieve the above object, the present invention provides a cross-machine injection molding parameter conversion method, which is used to convert a raw process parameter of a transfer machine into another converted process parameter transferred to the machine, the above The parameter conversion method includes the following steps: first, obtaining a plurality of mold parameters, a plurality of material parameters, a plurality of machine parameters, and a plurality of process parameters of the transfer machine and the transfer machine.

One of the process parameters is selected, and a plurality of first set values are set on the transfer machine according to the selected process parameters, and a plurality of second set values are set on the transfer machine.

Each of the first set values is actually operated on the transfer machine to obtain a first actual work value, and each of the second set values is actually transferred to the machine to obtain a corresponding second actual work value. . After obtaining the first actual working value and the second actual working value, calculating a first compensation function according to the first set value and the first actual working value, and according to the second set value and the second The actual job value calculates a second compensation function.

Then, according to the obtained mold parameters, material parameters and machine parameters of the transfer machine and the transfer machine, the calculated first compensation function is used to convert the transferred process parameters into an initial work value, and use The second compensation function converts the initial job value obtained above into the process parameter to be transferred.

Thereby, the present invention can more accurately convert the original process parameters originally used in the transfer machine into the converted process parameters transferred to the machine through the compensation function, thereby reducing the error of the injection molding product.

The invention also provides a cross-machine injection molding parameter conversion system capable of performing the foregoing parameter conversion method, comprising an input device for inputting mold parameters, material parameters, machine parameters and process parameters, and obtaining the transfer machine and the transfer a first actual working value of the entering station and a second actual working value; a computing device capable of calculating a first compensation function according to a relationship between the first set value and the first actual working value, and according to the second set value The relationship between the second actual job values is calculated to obtain a second compensation function; and an output device is configured to display the converted process parameters.

Preferably, the input device is connected to the transfer machine and the transfer machine in a wired or wireless manner, and obtains the first actual work value and the second actual work value through the communication interface.

S1-S10‧‧‧ steps

a, b, a1, a2, b1, b2‧‧‧ projects

Figure 1 is a flow chart of the steps of the present invention.

Fig. 2 is a graph showing the relationship between the injection speed and the reverse flow rate when the work is actually performed.

Fig. 3 is a graph showing the relationship between the injection speed and the speed error when the work is actually performed.

Fig. 4 is a graph showing the relationship between the holding pressure and the reverse flow at the time of actual work.

Figure 5 is a graph showing the relationship between the holding pressure and the maximum pressure in the mold during actual operation.

In order to better understand the features of the present invention, the present invention provides two embodiments and is described below in conjunction with the drawings. Referring first to the flowchart of the steps of FIG. The invention is used for injection molding technology, and is mainly used for injection molding machine (hereinafter referred to as "returning machine" for transferring a mold. The original process parameters of the table "" are converted into the post-conversion process parameters of the injection molding machine (hereinafter referred to as "transfer machine") to which another mold is transferred. The respective steps of the present invention will be described in detail below.

Step S1: First, obtain a plurality of mold parameters, material parameters, machine parameters, and process parameters of the transfer machine and the transfer machine. Wherein, the mold parameters include, but are not limited to, the specifications of the mold; the material parameters include, but are not limited to, the material of the plastic; the machine parameters include, but are not limited to, the screw diameter (mm) of the injection molding machine, the maximum injection pressure (kgf/cm ² ), and the system. Pressure (kgf/cm ² ); process parameters include, but are not limited to, plastic temperature (°C), injection speed (mm/s), holding pressure (kgf/cm ² ), injection stroke (mm), and metering stroke (mm).

Step S2: selecting one of the process parameters, designing an implementation parameter table according to the selected process parameters, planning a plurality of first set values that can be set on the transfer machine, and settingtable on the transfer machine A plurality of second set values are used to perform subsequent measurements.

Step S3: Select the plastic to be used and dry the plastic.

Step S4: installing the detecting vehicle, the vehicle includes at least a pressure sensor for measuring the pressure of the holding pressure, the pressure inside the mold, and the like.

The measured items can be divided into a data measurement of the injection stage a and a data measurement of the pressure holding stage b, wherein the measurement item of the injection stage includes at least the measurement item of the injection reverse flow a1 and the injection speed a2, and the pressure holding stage. At least the holding pressure b1 and the holding pressure reverse flow b2 are included.

After step S3 and step S4 are completed, the process proceeds to step S5. According to the process parameter table, one of the first set values is set to the transfer machine according to the process parameters selected in step S2, and after the setting is completed, the process proceeds to step S6.

In step S6, the use of the transfer machine and the injection according to the first set value will be used. The sample is actually taken out at the stage and the pressure holding stage, wherein the step S6 can be further divided into four sub-steps to obtain the first actual working value.

Step S6.1: obtaining an injection sample prepared by controlling different injection speeds during the injection phase; and step S6.2: obtaining data of the measured injection speed at the injection stage; and step S6.3: obtaining the insurance During the pressing phase, the holding pressure and the corresponding in-mold pressure data; Step S6.4: Obtaining the injection sample prepared by controlling different holding pressures during the holding phase.

After the relevant data is acquired in steps S6.1-S6.4, the process proceeds to step S7. In step S7, the first set value is changed and the transfer machine is reset, and then steps S5 and S6 are repeated, one by one for each of the first set values. When all the above first set values have been set and measured, return to step S5 to start setting the second set value to the transfer machine, and sample all the second set values as if the machine is turned out. After the production and data measurement are completed (ie, steps S6 to S7), the loop of steps S5 to S7 is ended and the process proceeds to steps S8.1 and S8.2. It is worth mentioning that the actual test can also be carried out before the trial production and measurement of the machine, and then transferred to the machine part.

When step S8.1 is performed, the weights of the injected sample and the pressure holding sample obtained in step S6.1 and step S6.4 are measured to obtain actual working values such as the reverse flow rate in the injection phase and the pressure maintaining phase, respectively; In step S8.2, based on the data obtained in step S6.2 and step S6.3, the actual operation value of the speed error and the maximum pressure in the mold is calculated.

Then, step S9 is executed to obtain each first set value and the corresponding first real After the work value, and each second set value and the corresponding second actual work value, a relationship diagram (for example, Figures 2 to 5) is created, and then curve fitting is performed to obtain the first compensation letter of the transfer machine. And the second compensation function that is transferred to the machine.

Then in step S10, according to the mold parameters, material parameters, machine parameters and process parameters of the transfer machine and the transfer machine, the first compensation function is used to convert the original process parameters of the transfer machine into one. The initial job value is then converted to the post-conversion process parameter using the second compensation function.

The flow of the steps of the parameter conversion of the present invention has been described. The actual operation value and the compensation function fitted in the actual injection phase and the pressure holding phase will be described below. Please refer to FIG. 2 to FIG. 5 . .

Please refer to Fig. 2 and Fig. 3 first, which are the relationship between the reverse flow rate and the injection speed measured by adjusting the plastic temperature during the injection phase, and the relationship between the speed error and the injection speed. The data curve measured in Fig. 2 is fitted with a quadratic polynomial, and the fitted compensation function is as follows: 190 ° C: y = 0.00042 x ^{2 -} 0.11668 x + 25.40985

210°C: y=0.00026x ² -0.11482x+30.19122

230°C: y=0.00001x ² -0.02144x+27.86373

In the above compensation function, x is the injection speed and y is the reverse flow.

In addition, the data curve of Fig. 3 is fitted. Since the relationship between the measured velocity error and the injection velocity is substantially constant, the compensation function is calculated as follows: 190 ° C: y = 2.2

210 ° C: y = 1

230 ° C: y = 1

In the above compensation function, x is the injection speed and y is the speed error.

Please refer to Fig. 4 and Fig. 5 respectively, which are the relationship between the reverse flow rate and the holding pressure measured by adjusting the plastic temperature during the holding phase, and the relationship between the maximum pressure in the mold and the holding pressure. . Among them, the data curve of Fig. 4 is fitted with a quadratic polynomial, and the fitted compensation function is as follows: 190 °C: y=1E-07x ² +0.0026x+2.2314

210°C: y=-2E-06x ² +0.0077x+0.7572

230°C: y=-4E-06x ² +0.0131x-0.8739

In the above compensation function, x is the holding pressure and y is the reverse flow.

In addition, the data curve of Fig. 5 is fitted with a polynomial, and the fitted compensation function is as follows: 190 °C: y=0.76867x-96.4

210°C: y=0.81724x-78.54286

230 ° C: y = 0.85367x - 71.93333

In the above compensation function, x is the holding pressure and y is the maximum pressure in the mold.

Two embodiments will be set forth below to illustrate how to perform parameter conversion using the method of the present invention.

First embodiment:

Suppose you want to use the same plastic and use the same mold, and install the mold from a transfer machine to a transfer machine, assuming the machine parameters and process of the transfer machine and the transfer machine The parameter list is as follows, and you want to convert the original process parameters (including the injection speed and the holding pressure) that are transferred out of the machine into the converted process parameters for transferring to the machine.

If the compensation function is not used, the exit speed of the transfer to the machine should be: The screw radius of the machine is 11 (mm), the screw radius of the machine is 12.5 (mm), and the exit speed of the machine is 70 (mm/s).

Assuming that the speed error (y) versus the injection speed (x) at the plastic temperature of 210 ° C, the calculated first compensation function of the transfer machine and the second compensation function of the transfer machine are as follows: First compensation letter Type: y = 1 (mm / s)

The second compensation function: y=5 (mm/s)

The injection speed calculated after transferring to the machine after using the compensation function shall be:

It can be seen that if the tuning master uses the parameter conversion method of the present invention, the error 4 (mm/s) in the parameter conversion process can be reduced, and the result of the tuning is more accurate.

On the other hand, if the pressure of the pressure that is transferred out of the machine refers to the front end of the screw, the pressure of the pressure that is transferred to the machine refers to the system pressure. In the case where the compensation function is not used, the holding pressure to be transferred to the machine should be: The pressure of the pressure-receiving machine is 800 (kgf/cm ² ), the maximum injection pressure into the machine is 2017 (kgf/cm ² ), and the system oil pressure transferred to the machine is 170 (kgf/cm). ² )

Assume that the first compensation function of the transfer machine calculated on the maximum pressure (y) of the mold at the plastic temperature of 210 ° C and the second compensation function of the transfer machine is as follows: Compensation function: y=0.81724x-78.54286

The second compensation function: y=0.83097x-71.66667

The holding pressure calculated into the machine using the compensation function shall be:

It can be seen that if the tuning master uses the converted holding pressure, the result of the tuning will be more accurate.

The present invention further provides a second embodiment: suppose that it is intended to use the same plastic and use the same mold, and the mold is installed from the transfer machine to the transfer machine, assuming that the machine is transferred to the machine. The machine parameters and process parameters are listed below. It is necessary to convert the original process parameters (including the injection stroke and the metering stroke) of the transfer machine into the converted process parameters for transfer to the machine.

If the compensation function is not used, the injection path to the machine should be:

Assume that the first compensation function of the transfer machine calculated with respect to the reverse flow rate (y) versus the injection speed (x) at the plastic temperature of 210 ° C and the second compensation function transferred to the machine are as follows: First compensation function :y=0.00026x ² -0.11482x+30.19122

The second compensation function: y=0.00074x ² -0.19133x+32.89798

When the exit speed of the transfer machine is 70 (mm/s), the reverse flow is obtained by substituting the first compensation function to be about 23.4%; when the injection speed of the transfer machine is 50 (mm/s), the second compensation is substituted. The function achieves a reverse flow of approximately 25.2%.

Therefore, in consideration of the compensation function, the injection stroke to the machine should be:

On the other hand, assuming that no compensation function is used, the measurement stroke to be transferred to the machine should be:

Assume that the first compensation function of the transfer machine calculated with respect to the counter flow (y) versus the holding pressure (x) at the plastic temperature of 210 ° C and the second compensation function of the transfer machine are as follows: First compensation letter Equation: y=-2E-06x ² +0.0077x+0.7572

The second compensation function: y=-2E-05x ³ -0.2257x ² +0.4459x-6.9743

When the pressure of the transfer machine is 800 (kgf/cm ² ), the reverse flow rate obtained by substituting the first compensation function is about 5.6%; when the pressure of the transfer machine is 65 (kgf/cm ² ) The reverse flow obtained by substituting the second compensation function is about 3.4%.

Therefore, under the consideration of the compensation function, the measurement stroke transferred to the machine should be:

Similarly, it can be seen that the use of the method of the present invention facilitates more accurate tuning and reduces errors in injection molded products.

Finally, it should be noted that the embodiments of the present invention disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention. Any other possible step changes should also be covered by the scope of the patent application of the present application. .

Claims (8)

A cross-machine injection molding parameter conversion method is used for converting a raw process parameter of a transfer machine into a converted process parameter transferred to the machine. The parameter conversion method comprises the following steps: obtaining the roll-out a plurality of mold parameters, a plurality of material parameters and a plurality of machine parameters, and a plurality of process parameters of the machine and the transfer machine; selecting one of the process parameters, and transferring the process parameters according to the selected process parameter The machine sets a plurality of first set values, and sets a plurality of second set values on the transfer machine; and each of the first set values and each of the second set values are respectively at the transfer machine and the transfer The machine actually performs an operation to respectively obtain a corresponding first actual work value and a second actual work value, and calculates a first compensation function according to the relationship between the first set value and the first actual work value. Calculating a second compensation function according to the relationship between the second set value and the second actual working value; and according to the mold parameters of the transfer machine and the transfer machine, the material parameters These machines Such parameters and process parameters, the first compensation function using the original process parameter calculating an initial value of the job, and the second compensation function using a conversion process that converts the initial parameter values of the job. The parameter conversion method according to claim 1, wherein the machine parameters include at least a screw diameter of the injection molding machine, and the original process parameters, the converted process parameters, and the selected process parameters are injection molding machines. The injection speed, and the first actual job value and the second actual job value are speed errors. The parameter conversion method of claim 1, wherein the machine parameters include at least an injection The maximum injection pressure of the machine and the system pressure, wherein the original process parameter, the converted process parameter and the selected process parameter are pressure holding pressure, and the first actual working value and the second actual working value are modulo The maximum pressure inside. The parameter conversion method according to claim 1, wherein the machine parameters include at least a screw diameter of the injection molding machine, and the original process parameter and the converted process parameter are an injection stroke of the injection molding machine, and the selected The process parameter is an injection speed of the injection molding machine, and the first actual work value and the second actual work value are reverse flow rates. The parameter conversion method according to claim 1, wherein the machine parameters include at least a screw diameter of the injection molding machine, and the original process parameter and the converted process parameter are a metering stroke of the injection molding machine, the selected one The process parameter is a holding pressure, and the first actual working value and the second actual working value are reverse flow. The parameter conversion method according to any one of claims 1 to 5, wherein the first compensation function and the second compensation function are a polynomial or a constant. A cross-machine injection molding parameter conversion system for performing the parameter conversion method according to claim 1, comprising: an input device for inputting a plurality of molds of the transfer machine and a transfer machine a parameter, a plurality of material parameters and a plurality of machine parameters, and a plurality of process parameters, and capable of inputting a plurality of first actual work values and a plurality of values obtained by actually operating the transfer machine and the transfer machine a second actual work value; a computing device, calculating a first compensation function according to a relationship between the plurality of first set values selected by the user and the first actual work values, and according to the plural selected by the user Calculating a relationship between the second set value and the second actual work value to obtain a second compensation function; Determining the original process parameters using the first compensation function according to the mold parameters of the transfer machine and the transfer machine, the material parameters, the machine parameters, and the process parameters a value, and using the second compensation function to convert the initial job value out of the converted process parameter; and a display device for displaying the converted process parameter. The parameter conversion system of claim 7, wherein the input device is connected to the transfer machine and the transfer machine in a wired or wireless manner, and obtains the first actual work value and the same through a communication interface. The second actual job value.