JP2017209880A - Setting support method of injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a setting support method that prevents in advance occurrence of abnormality by functioning as a preventive technology, always secures an intrinsic molding quality and uniformity, and surely prevents a molded product defect from occurring caused by degradation of a resin material.SOLUTION: Resin material data Dr relating to a resin decomposition rate Sx to a temperature Ht corresponding to a kind of the resin material are set in advance as a data base 3, when setting a molding condition, after setting the molding condition, a present cycle time Tcp that is a molding cycle time based on the set molding condition is obtained, a heating cylinder temperature Htc set to a heating cylinder 4 and an optimum cycle time Tcs that is a molding cycle time based on the kind of the resin material used are obtained by an arithmetic processing under the condition that these do not exceed the resin decomposition rate Sx set to the resin material used, and the present cycle time Tcp and the optimum cycle time Tcs are displayed on a display 5 at least comparably.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an injection molding machine setting support method for optimizing a molding cycle time in an injection molding machine.

  In general, in an injection molding machine, a solid resin material such as pellets used as a molding material is put into a heating cylinder of an injection device, and the resin material melted in the heating cylinder is injected and filled into a mold. Do. On the other hand, when the resin material is left in a molten state, that is, in a heated state for a long time, the resin material is decomposed and further deteriorated (carbonized) due to the decomposition. It is important also from the viewpoint of improving molding and reducing molding defects, and an apparatus for the purpose of such monitoring has also been proposed.

  Conventionally, as a device for the purpose of monitoring or control based on monitoring of such a molten resin material, a control device for an injection molding machine disclosed in Patent Document 1 and a resin for an injection molding machine disclosed in Patent Document 2 A state monitoring apparatus is known. The control device disclosed in Patent Document 1 is intended to prevent the resin from carbonizing or decomposing due to an abnormality occurring and stopping the injection molding machine. A heater that heats the cylinder, a timer that starts timing when an abnormality occurs in the injection molding machine, a sensor that detects the temperature of the resin, the time measured by the timer, the type of resin, and the detected resin And a heating control means for changing the set value of the heater when a set time set based on the difference between the temperature and the reference temperature is reached. Thereby, when the time measured by the timer reaches the set time set based on the type of the resin and the difference between the detected resin temperature and the reference temperature, the set value of the heater is changed. .

  Further, the resin state monitoring device disclosed in Patent Document 2 is a state monitoring device for an injection molding machine having a heater for melting resin, and this state monitoring device is a temperature detection unit that detects the temperature of the heater. A resin moving unit that moves the molten resin by the heater, a resin movement detecting unit that detects that the resin has been moved, and a resin movement state that indicates an exponential function of the detected temperature. It is equipped with a resin deterioration state calculation unit that is obtained by integration according to the time during which it is not performed, so that a warning is issued when the calculated deterioration state exceeds a preset threshold value. is there.

JP 11-105093 A Japanese Patent No. 5302436

  However, the above-described conventional injection molding machine has the following problems in the apparatus for the purpose of monitoring the molten resin material or controlling based on the monitoring.

  First, any device is constructed as a countermeasure technique when an abnormal state occurs with respect to a normal state. In other words, it is not constructed as a preventive technique for preventing an abnormality in advance, and since the occurrence of an abnormality is a prerequisite, it is difficult to reliably avoid a molded product defect associated with the occurrence of the abnormality. In particular, in the case of resin materials that are easily decomposed by temperature, even if the surface is normal, deterioration (carbonization) of the resin material proceeds due to a mismatch with the molding cycle time, and suddenly defective molded products It is not always sufficient from the viewpoint of reliably preventing a molded product defect.

  Secondly, conventionally, when setting molding conditions, the focus was on settings related to physical quantities such as speed setting, pressure setting, temperature setting, etc. Therefore, the molding cycle time is usually regarded as one of the molding conditions. However, it was used exclusively for production planning and production management from the viewpoint of productivity. However, if the molding cycle time is not properly set, there is a risk that the quality of the molding may be reduced or varied due to the occurrence of a decrease in the molecular weight of the resin or an increase in decomposition gas, etc. There was room for further improvement from the viewpoint of always maintaining an appropriate (optimal) molten state.

  An object of the present invention is to provide a setting support method for an injection molding machine that solves the problems existing in the background art.

  In order to solve the above-described problem, the injection molding machine setting support method according to the present invention previously corresponds to the type of resin material in the molding machine controller 2 when optimizing the molding cycle time in the injection molding machine M. The resin material data Dr related to the resin decomposition rate Sx with respect to the temperature Ht is set as the database 3, and after setting the molding conditions by the molding machine controller 2 when setting the molding conditions for the injection molding machine M, molding based on the set molding conditions While obtaining the current cycle time Tcp, which is the cycle time, the optimum cycle time Tcs, which is the molding cycle time based on the heating cylinder temperature Htc set for the heating cylinder 4 and the type of resin material to be used, is used for the resin material to be used. Calculated by the calculation process on the condition that the set resin decomposition rate Sx is not exceeded, and the current cycle time T The p and optimum cycle time Tcs, characterized by comparably displayed on the display 5 at least the molding machine controller 2.

  In this case, according to a preferred aspect of the invention, the current cycle time Tcp includes an injection time Tin for performing injection filling to the mold 11 during the injection process, a cooling time Tco for cooling the resin in the mold 11, and a mold opening. A time obtained by adding an intermediate time Tmi from the end of the process to the start of the mold clamping process can be used, and the maximum value among the plurality of set heating cylinder temperatures Htc can be used as the heating cylinder temperature Htc. . Further, the optimum cycle time Tcs can be set on condition that the resin material does not exceed a preset residence time Tr in which the resin material can stay inside the heating cylinder 4. The residence time Tr can be set on condition that the resin decomposition rate Sx satisfies the range of 0.01 to 2 [wt%], and the resin decomposition rate Sx can be set to an arbitrary size. . On the other hand, a condition setting screen 12 for setting molding conditions can be displayed on the display 5, and a second setting screen 13 for displaying the optimum cycle time Tcs can be displayed on the condition setting screen 12. The second setting screen 13 can be displayed in a window on the condition setting screen 12. In addition, the second setting screen 13 can display a plurality of resin material selection keys Ra that can select a resin material to be used, and a resin decomposition rate setting unit 14 that can arbitrarily set the resin decomposition rate Sx. Can be displayed.

  According to the setting support method of the injection molding machine according to the present invention by such a method, the following remarkable effects are obtained.

  (1) Since the current cycle time Tcp and the optimum cycle time Tcs are displayed so as to be comparable to at least the display 5 of the molding machine controller 2, for example, the operator compares the optimum cycle time Tcs with the current cycle time Tcp, It can be easily and accurately known how much the current cycle time Tcp is different from the optimum cycle time Tcs. As a result, if it is determined that there is a need to change the current cycle time Tcp due to a large difference or the like, the molding condition that can change the molding cycle time, for example, resetting such as increasing the injection speed is performed. It can be carried out. As a result, the current cycle time Tcp can be shortened and adapted to the optimum cycle time Tcs, and the optimum molding cycle time matching the resin material to be used can always be maintained. Therefore, it is possible to avoid the occurrence of a decrease in molecular weight of the resin, an increase in decomposition gas, etc., always ensure the original molding quality and homogeneity, avoid the occurrence of abnormalities by functioning as a preventive technique, and melt the resin Occurrence of molded product defects due to material deterioration can be more reliably prevented.

  (2) According to a preferred embodiment, when setting the current cycle time Tcp, the injection time Tin for performing injection filling to the mold 11 during the injection process, the cooling time Tco for cooling the resin in the mold 11, and the mold opening If the time obtained by adding the intermediate time Tmi from the end of the process to the start of the mold clamping process is used, it is possible to cover almost the entire molding cycle time and to easily set the existing set value.

  (3) According to a preferred embodiment, if the maximum value among the plurality of set heating cylinder temperatures Htc... Is used as the heating cylinder temperature Htc, the highest temperature in the entire heating cylinder temperature Htc. From the viewpoint of preventing the problem, the reliability can be further improved, and in particular, the processing in the arithmetic processing or the like can be simplified.

  (4) When the optimum cycle time Tcs is set according to a preferred embodiment, if the resin material is set on condition that it does not exceed a preset residence time Tr that can stay inside the heating cylinder 4, the residence of the resin material Deterioration of the resin material can be prevented from the viewpoint of time Tr, and its reliability can be further increased.

  (5) According to a preferred embodiment, when setting the residence time Tr, if the resin decomposition rate Sx is set to satisfy the range of 0.01 to 2 [wt%], the lower limit of the resin material The deterioration of the resin material can be reliably prevented by the upper limit regulation while avoiding insufficient melting (insufficient plasticization).

  (6) If the resin decomposition rate Sx can be set to an arbitrary size according to a preferred embodiment, the optimum resin decomposition rate Sx can be set in consideration of the operator's experience and know-how such as intuition. This makes it possible to make more desirable settings for the molding conditions.

  (7) According to a preferred embodiment, a condition setting screen 12 for setting molding conditions is displayed on the display 5, and a second setting screen 13 for displaying the optimum cycle time Tcs is displayed on the condition setting screen 12. By doing so, the second setting screen 13 displays a plurality of resin material selection keys Ra that can select the resin material to be used, and the resin decomposition rate setting unit 14 that can arbitrarily set the resin decomposition rate Sx. Since it is possible to optimize the molding cycle time and to set (reset) the molding conditions on the condition setting screen 12, the setting process can be facilitated and speeded up.

  (8) By displaying a window on the condition setting screen 12 when displaying the second setting screen 13 according to a preferred embodiment, the original molding condition setting ( Re-setting).

The flowchart which shows an example of the process sequence of the setting assistance method which concerns on suitable embodiment of this invention, Overall appearance view of injection molding machine including an enlarged view of the condition setting screen displayed on the display to which the setting support method can be applied, Detailed view of the same condition setting screen, Block diagram of a molding machine controller that can execute the setting support method, Main part system diagram for explaining the setting support method, Resin material data that can be used in the setting support method, and a characteristic graph for each resin material showing the time when the resin material decreases by 1 [wt%] with respect to temperature,

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, in order to facilitate understanding of the setting support method according to the present embodiment, an outline of an injection molding machine M to which the setting support method can be applied will be described with reference to FIGS.

  In FIG. 2, the whole external view of the injection molding machine M is shown. The injection molding machine M includes an injection device Mi and a mold clamping device Mc installed on the molding machine bed Mb. The injection device Mi includes a heating cylinder 4 provided with a heater on the outer peripheral surface. The injection cylinder Mi has an injection nozzle not shown in the drawing at the front end of the heating cylinder 4, and a hopper to which a resin material is supplied to the rear portion of the heating cylinder 4. 21 is provided. On the other hand, the mold clamping device Mc is provided with a mold 11 composed of a movable mold and a fixed mold, and the mold 11 is provided with a cooling water jacket.

  Further, a protective panel 23 is installed on the molding machine bed Mb, and in particular, a display 5 is attached to the intermediate panel 23s located near the center. Further, the injection molding machine M includes a molding machine controller 2 shown in FIG. 4, and a display 5 is connected to the molding machine controller 2. The molding machine controller 2 and the display 5 constitute a main part for executing the setting support method according to the present embodiment. On the other hand, in FIG. 2, a schematic diagram of the condition setting screen 12 displayed on the display 5 used when executing the setting support method is extracted and shown, and in FIG. 3, the condition setting screen 12 is enlarged. Detailed view is shown.

  Next, configurations and functions of the molding machine controller 2 and the display 5 used when executing the setting support method according to the present embodiment will be specifically described with reference to FIGS.

  FIG. 4 shows a block system of the molding machine controller 2. The molding machine controller 2 includes a controller main body 41 incorporating hardware such as a CPU, and an internal memory 42 such as an SSD managed by the controller main body 41. The display 5 described above is connected to the controller main body 41 via the display interface 43. The illustrated display 5 includes a display body 5d that performs various displays and a touch panel 5t that is attached to the display body 5d and performs various inputs.

  The internal memory 42 has a data area 42d in which various data can be written and a program area 42p in which various programs can be stored. Therefore, in the data area 42d, in relation to the implementation of the setting support method according to the present embodiment, at least the classification data Drs for each resin material and the resin decomposition rate Sx for the temperature Ht corresponding to each resin material. Resin material data Dr including the related resin decomposition rate data Drx can be written. This data area 42d functions as the database 3.

  On the other hand, in the program area 42p, a PLC program and an HMI program are stored, and various processing programs for executing various arithmetic processes (calculation processes) and various control processes (sequence control) are stored. Therefore, the molding machine controller 2 is basically configured as a computer system and has a function of controlling the entire injection molding machine M. The PLC program is software for realizing the sequence operation of various processes in the injection molding machine M, the monitoring of the injection molding machine M, and the HMI program is the setting and display of operation parameters of the injection molding machine M, injection This is software for realizing display of operation monitoring data of the molding machine M and the like.

  The program area 42p stores a setting support program for executing the setting support method according to the present embodiment. As shown in FIG. 4, the setting support program obtains and displays a current cycle time Tcp that is a molding cycle time based on the set molding conditions after setting molding conditions by the molding machine controller 2 at least. The display function Fp, the heating cylinder temperature Htc set for the heating cylinder 4 and the optimum cycle time Tcs, which is the molding cycle time based on the type of resin material used, are set to the resin decomposition rate Sx set for the resin material used. An optimum cycle time calculation function Fb obtained by calculation processing under the condition that it does not exceed, a cycle time comparison display function Fc for displaying the current cycle time Tcp and the optimum cycle time Tcs at least on the display 5 so as to be comparable can be executed. it can.

  On the other hand, in FIG. 4, Mm denotes a molding machine main body in the injection molding machine M, and a temperature control including a drive system 45 including various drive actuators provided in the molding machine main body Mm and a driver for supplying power to a heater and the like. The system 46 is connected to the controller main body 41. As a result, various control signals (control commands) are applied from the controller main body 41 to the drive system 45 and the temperature adjustment system 46, and are detected from the drive system 45 and the temperature adjustment system 46 by sensors and switches. Various detection signals (detection data) are given to the controller main body 41.

  Furthermore, as shown in FIG. 3 (FIG. 4), a condition setting screen 12 for setting molding conditions is displayed on the display 5. Using this condition setting screen 12, the setting support method according to the present embodiment can be implemented. In this case, in order to display a plurality of screen switching keys at the top and bottom of the condition setting screen 12, respectively, by turning on the "main condition" switching key 35 arranged at the top, as shown in FIG. The condition setting screen 12 can be displayed. The exemplary condition setting screen 12 includes a mold clamping condition setting unit 36a, a mold opening condition setting unit 36b, an ejector condition setting unit 36c, a temperature condition setting unit 36d, a filling speed condition setting unit 36e, a limit pressure condition setting unit 36f, and a speed. -A pressure (VP) switching condition setting unit 36g and the like, and a graphic display unit 37 capable of displaying various trend data in graphic form. Normal setting related to the molding conditions can be performed using the condition setting screen 12.

  On the other hand, on the condition setting screen 12, the current cycle time display unit 51 for displaying the current cycle time Tcp and the optimum cycle time display unit for displaying the optimum cycle time Tcs in relation to the implementation of the setting support method according to the present embodiment. 13c is provided. In the case of the example, as shown in FIG. 3, a “resin” selection key 38 is provided in the condition setting screen 12, and the second setting screen 13 is displayed in a window by turning on this “resin” selection key 38. . The second setting screen 13 is shown in FIG. In FIG. 3, only the display position of the second setting screen 13 is indicated by a virtual line. As a result, the current cycle time display unit 51 and the optimum cycle time display unit 13 c are displayed in the second setting screen 13.

  The current cycle time Tcp displayed on the current cycle time display unit 51, that is, the molding cycle time based on the molding conditions set after the molding conditions are set by the molding machine controller 2 when setting the molding conditions for the injection molding machine M. As the current cycle time Tcp, as shown in FIG. 3, the set time of the process time setting unit 39 displayed on the condition setting screen 12 is used. In the case of illustration, the process time setting unit 39 includes an injection time setting unit 39a for setting an injection time Tin for performing injection filling to the mold 11 during the injection process, and a cooling time Tco for cooling the resin in the mold 11. Since the cooling time setting unit 39b to be set and the intermediate time setting unit 39c for setting the intermediate time Tmi from the end of the mold opening process to the start of the mold clamping process are provided, the injection time Tin, the cooling time Tco, and the intermediate time Tmi Was used as the current cycle time Tcp. As described above, when the current cycle time Tcp is set, if the time obtained by adding the injection time Tin, the cooling time Tco, and the intermediate time Tmi is used, almost the entire molding cycle time can be covered, and the existing set value can be used. There is an advantage that it can be set easily.

  Therefore, the current cycle time Tcp obtained by adding in this way is displayed on the current cycle time display unit 51 in the second setting screen 13 by the current cycle time display function Fp. In the case of the example, 39.00 [seconds]. It is shown that.

  In the embodiment, when the current cycle time Tcp is displayed, the current cycle time display unit 51 on the second setting screen 13 is used. However, the process time setting unit 39 is also used as the current cycle time display unit 51. It is also possible to make it. That is, in the example, as shown in FIG. 5, the process time setting unit 39 displays 15.00 [second] as the injection time Tin and 24.00 [second] as the cooling time Tco. Since 0 [second] is displayed as the intermediate time Tmi, the operator can easily recognize that it is the time obtained by adding 15.00 and 24.00, that is, 39.00 [second]. The time setting unit 39 can also be used as the current cycle time display unit 51 as it is.

  On the other hand, the optimum cycle time Tcs can be obtained using the second setting screen 13, and the obtained optimum cycle time Tcs is displayed on the optimum cycle time display unit 13c. In this case, by the optimum cycle time calculation function Fb, the optimum cycle time Tcs which is the molding cycle time based on the heating cylinder temperature Htc set for the heating cylinder 4 and the type of the resin material to be used is used for the resin material to be used. The optimum cycle time Tcs obtained by the calculation process on the condition that the set resin decomposition rate Sx is not exceeded is displayed on the optimum cycle time display unit 13c. The second setting screen 13 has a cycle time comparison display function Fc.

  Therefore, as shown in FIG. 5, the second setting screen 13 includes a resin selection unit 32 that displays a plurality of resin material selection keys Ra... Capable of selecting a resin material to be used. A resin decomposition rate setting unit 14 that sets an allowable resin decomposition rate Sx. In this case, a total of sixteen resin material selection keys Ra, Rb, Rc, Rd... Rn, Ro, Rp are arranged in the resin selection unit 32. This makes it possible to select an arbitrary resin material selection key Ra ..., and the resin material to be used is set by turning it ON. Moreover, the resin decomposition rate setting part 14 can set arbitrary resin decomposition rates Sx with respect to the resin material to be used. As will be described later, the resin decomposition rate Sx to be set is 0.01-2 [wt%]. ] Can be set from the range. In the second setting screen 13, reference numeral 52 denotes a “confirm” key, and 53 denotes a “close” key.

  As described above, if the second setting screen 13 for displaying the optimum cycle time Tcs is displayed on the condition setting screen 12 for setting the molding conditions, the resin material to be used is selected on the second setting screen 13. A plurality of possible resin material selection keys Ra ... can be displayed, and a resin decomposition rate setting unit 14 capable of arbitrarily setting the resin decomposition rate Sx can be displayed. Since molding conditions can be set (reset) together, there is an advantage that the setting process can be facilitated and speeded up. Further, as shown in the example, when the second setting screen 13 is displayed, if the window is displayed on the condition setting screen 12, the setting (re-setting) of the original molding conditions can be performed while performing the optimization process of the molding cycle time. It can be carried out.

  Next, the setting support method according to the present embodiment will be specifically described with reference to FIGS.

  First, the basic concept of the setting support method according to the present embodiment will be described. First, in the molding machine controller 2, the resin material data Dr ... relating to the resin decomposition rate Sx with respect to the temperature Ht corresponding to the type of the resin material is set as the database 3 in advance. As the resin material data Dr related to the resin decomposition rate Sx, characteristic data for each resin material indicating the time when the resin material is reduced by 1 wt% with respect to the temperature Ht as shown in FIG. 6 can be used. FIG. 6 is obtained by a so-called Ozawa method. For example, in the case of “PP”, the mass of 1% is decomposed by heating for 10 minutes at 190 ° C. Is shown. In the case of “PPS”, the mass of 1% is decomposed by heating for 100 minutes at 340 ° C. In this case, it is understood that “PP” is a resin material that is very easily deteriorated.

  Therefore, if the resin decomposition rate Sx is set to an arbitrary value that is not regarded as deterioration, and the necessary control of time or temperature is performed so as not to exceed the set resin decomposition rate Sx, the resin material It becomes possible to prevent deterioration. In this case, the resin decomposition rate Sx that is not regarded as deterioration is a value that does not cause defective elements such as “burn” and “black spot” in the molded product, and is preferably 0.01 to 2 wt%. It becomes a range. In this range, if it is less than 0.01 [wt%], it may not be sufficiently heated, so that there is a risk of insufficient melting. On the other hand, if it exceeds 2 [wt%], the resin material is deteriorated. May not be negligible and may cause defective products.

  Therefore, the operator can set an arbitrary resin decomposition rate Sx within this range (0.01 to 2 [wt%]) by the resin decomposition rate setting unit 14 described above. In this way, if the resin decomposition rate Sx can be set to an arbitrary size, the optimum resin decomposition rate Sx can be set in consideration of the operator's experience and know-how such as intuition, thereby preventing deterioration of the resin material. However, there is an advantage that more desirable settings can be made for the molding conditions.

  The database 3 of the molding machine controller 2 registers the heating cylinder 4, the dimensions of the screw inserted into the heating cylinder 4, and the volume of the molded product (cavity volume in the mold 11). Thus, the number of shots to be molded can be calculated from the total amount of resin staying in the heating cylinder 4, and the residence time Tr of the resin material can be calculated from the number of shots and the molding cycle time.

  Therefore, if the residence time Tr is set on condition that the resin decomposition rate Sx satisfies the above-mentioned range of 0.01 to 2 [wt%], the resin material is insufficiently melted (plasticization is insufficient) due to the lower limit. ), The deterioration of the resin material can be surely prevented by the upper limit regulation. If the residence time Tr is set, the molding cycle time at this time can be calculated. Thereby, when setting the optimum cycle time Tcs, it becomes possible to set the condition that the resin material does not exceed the preset residence time Tr that can stay in the heating cylinder 4. From the viewpoint, deterioration of the resin material can be prevented and the reliability thereof can be further increased.

  Next, a specific processing procedure related to the setting support method according to the present embodiment will be described according to the flowchart shown in FIG.

  First, on the arbitrary screen of the display 5 shown in FIG. 3, the “main condition” switching key 35 is turned ON to display the condition setting screen 12 shown in FIG. Various molding conditions are set (step S1). Specifically, setting of mold clamping conditions using the mold clamping condition setting unit 36a, setting of mold opening conditions using the mold opening condition setting unit 36b, and ejector conditions using the ejector condition setting unit 36c, which are main conditions, are performed. , Temperature condition setting using temperature condition setting unit 36d, filling speed condition setting using filling speed condition setting unit 36e, limit pressure condition setting using limit pressure condition setting unit 36f, speed-pressure ( The setting of the VP switching condition using the VP) switching condition setting unit 36g can be performed.

  When the setting of the molding conditions is completed, the injection time Tin is set using the injection time setting unit 39a, the cooling time Tco is set using the cooling time setting unit 39b, and the intermediate time Tmi is set using the intermediate time display unit 39c. (Steps S2 and S3). This setting may be a manual setting by the operator, or may be an automatic setting based on the set molding condition after other molding conditions are set. Alternatively, it may be a setting in which manual setting and automatic setting are combined. FIG. 5 illustrates a case where the injection time Tin is set to 15 [seconds], the cooling time Tco is set to 24 [seconds], and the intermediate time Tmi is set to 0 [seconds].

  When the above setting is completed, the operator determines whether or not to perform the molding cycle time optimization process based on the setting support method according to the present embodiment (step S4). In this case, when the resin material to be used is a resin material that is not easily deteriorated, such as “PPS” shown in FIG. 6, an optimization process related to the molding cycle time is not necessarily required. Can omit the optimization process.

  On the other hand, when it is determined that the molding cycle time optimization process according to the present embodiment is performed, first, the “resin” selection key 38 on the condition setting screen 12 is turned ON (step S5). As a result, the second setting screen 13 shown in FIG. 5 is displayed in a window on the condition setting screen 12 (step S6). Then, a resin material to be used is selected from a plurality of resin material selection keys Ra ... in the resin selection unit 32 of the second setting screen 13, and the selected resin material selection key Ra ... is turned ON (step S7).

  Further, the resin decomposition rate setting unit 14 is used to set the resin decomposition rate Sx (step S8). In this case, since the numeric keyboard is displayed by touching the display window of the resin degradation rate setting unit 14, a numeric value related to the resin degradation rate Sx can be input using the numeric keyboard. As described above, the resin decomposition rate Sx is set from the range of 0.01 to 2 [wt%]. When setting, for example, the skilled operator may set an arbitrary value determined as an appropriate value from the resin material to be used, or based on the fact that the beginner operator cannot determine, The added value may be set, and basically any value can be set on condition that the range of 0.01 to 2 [wt%] is satisfied. The example shows a case where 1.0 [wt%] is set.

  When the above setting is completed, the “confirm” key 52 is turned on (step S9). Thereby, the controller main body 41 has the resin material data Dr (FIG. 6) related to the resin material selected by the resin selection unit 32 and the resin decomposition rate Sx (1.0 [wt] set by the resin decomposition rate setting unit 14. %]) And the heating cylinder temperature Htc set for the heating cylinder 4, the residence time Tr of the resin material that can stay in the heating cylinder 4 is obtained by arithmetic processing. In addition, the molding cycle time is obtained by arithmetic processing from the obtained residence time Tr. The molding cycle time obtained thereby becomes the optimum cycle time Tcs, and is displayed on the optimum cycle time display portion 13c on the second setting screen 13 (step S10). The optimal cycle time Tcs illustrated is 15.00 [seconds].

  In this case, for the heating cylinder temperature Htc, for example, the maximum value among a plurality of different heating cylinder temperatures Htc... Set for each zone is used. In this way, if the maximum temperature Htc of the set plurality of heating cylinder temperatures Htc ... is used as the heating cylinder temperature Htc, the highest temperature in the entire heating cylinder temperature Htc ... is used, thereby preventing deterioration of the molten resin material. From the viewpoint, there is an advantage that the certainty can be further improved and, in particular, the processing in the arithmetic processing or the like can be simplified.

  As a result, the optimum cycle time Tcs is displayed on the optimum cycle time display unit 13c, and the current cycle time Tcp is displayed on the current cycle time display unit 51. Therefore, the operator can compare the two. In the example, the optimum cycle time Tcs is 15.00 [seconds], while the current cycle time Tcp is 39.00 [seconds]. That is, the current cycle time Tcp is 24.00 [seconds] longer than the optimum cycle time Tcs, and the operator can reset the molding conditions in order to shorten the current cycle time Tcp. (Steps S11 and S12).

  Specifically, resetting may be performed to shorten the current cycle time Tcp, such as increasing the injection speed, adjusting the heating cylinder temperature to Htc..., Or setting the resin decomposition rate Sx slightly higher. This resetting can include various setting elements. Of course, when there is no room for resetting with respect to the molding conditions, it is not always necessary to perform resetting. For example, a countermeasure such as strengthening monitoring for defective products may be performed. Therefore, resetting of the molding conditions is an example of a countermeasure, and various options can be included for the countermeasure based on the comparison result between the optimum cycle time Tcs and the current cycle time Tcp.

  On the other hand, when the illustrated resetting process is completed, the “confirm” key 52 is turned ON again (steps S13 and S9). As a result, the current cycle time Tcp is changed based on the reset molding condition. Therefore, by repeating such resetting process, the current cycle time Tcp can be finally driven within 15.00 [seconds]. If it is determined that the optimization has been performed, the optimization process is terminated. (Step S11).

  Therefore, according to such a setting support method according to the present embodiment, as a basic method, the resin material data Dr related to the resin decomposition rate Sx with respect to the temperature Ht corresponding to the type of the resin material is previously stored in the molding machine controller 2. Is set as the database 3 and the molding conditions are set by the molding machine controller 2 when setting the molding conditions for the injection molding machine M, and then the current cycle time Tcp, which is the molding cycle time based on the set molding conditions, is calculated and heated. The condition is that the heating cycle temperature Htc set for the cylinder 4 and the optimum cycle time Tcs, which is a molding cycle time based on the type of resin material to be used, do not exceed the resin decomposition rate Sx set for the resin material to be used. The current cycle time Tcp and the optimum cycle time Tcs are determined at least as the molding machine code. For example, the operator compares the optimum cycle time Tcs with the current cycle time Tcp, and how much the current cycle time Tcp is different from the optimum cycle time Tcs. You can easily and accurately know if it is. As a result, if it is determined that there is a need to change the current cycle time Tcp due to a large difference or the like, the molding condition that can change the molding cycle time, for example, resetting such as increasing the injection speed is performed. It can be carried out. As a result, the current cycle time Tcp can be shortened and adapted to the optimum cycle time Tcs, and the optimum molding cycle time matching the resin material to be used can always be maintained. Therefore, it is possible to avoid the occurrence of a decrease in molecular weight of the resin, an increase in decomposition gas, etc., always ensure the original molding quality and homogeneity, avoid the occurrence of abnormalities by functioning as a preventive technique, and melt the resin Occurrence of molded product defects due to material deterioration can be more reliably prevented.

  The preferred embodiment has been described in detail above. However, the present invention is not limited to such an embodiment, and the present invention is not limited to the detailed configuration, shape, material, quantity, numerical value, detailed method, and the like. Changes, additions and deletions can be made arbitrarily without departing from the scope.

  For example, the display 5 of the molding machine controller 2 does not necessarily have to be integrated with the molding machine controller 2, and may be displayed at least in a comparable manner, for example, by being transferred to a display of a mobile terminal such as a smartphone. Further, the case where the time obtained by adding the injection time Tin, the cooling time Tco, and the intermediate time Tmi is used as the current cycle time Tcp. However, a more accurate time may be used by adding other time. . Furthermore, although the case where the maximum value in the plurality of set heating cylinder temperatures Htc... Is used as the heating cylinder temperature Htc is shown, the maximum value may be used as it is, or a margin value or a correction value is added. It may be a value with a change. On the other hand, although the case where the resin decomposition rate Sx is set to an arbitrary size is shown, a unique resin decomposition rate Sx set in advance for each resin material may be used. In addition, when the second setting screen 13 for displaying the optimum cycle time Tcs is displayed on the condition setting screen 12, a window is displayed on the condition setting screen 12. An area for displaying the setting screen 13 may be provided.

  The setting support method for an injection molding machine according to the present invention can be used when optimizing molding cycle times in various injection molding machines that perform molding by repeating molding cycles.

  2: molding machine controller, 3: database, 4: heating cylinder, 5: display, 11: mold, 12: condition setting screen, 13: second setting screen, 13c: optimum cycle time display section, 14: resin decomposition rate Setting unit, M: injection molding machine, Sx: resin decomposition rate, Dr: resin material data, Tcp: current cycle time, Tin: injection time, Tco: cooling time, Tmi: intermediate time, Ra ...: resin material selection key

Claims (10)

  An injection molding machine setting support method for optimizing the molding cycle time of an injection molding machine, in which a database of resin material data related to a resin decomposition rate with respect to a temperature corresponding to the type of resin material is previously stored in a molding machine controller When setting the molding conditions for the injection molding machine, after setting the molding conditions by the molding machine controller, obtain the current cycle time that is the molding cycle time based on the set molding conditions and set it for the heating cylinder. The optimum cycle time, which is a molding cycle time based on the heated cylinder temperature and the type of resin material to be used, is obtained by calculation processing on condition that the resin decomposition rate set for the resin material to be used is not exceeded, and the current cycle The time and the optimum cycle time can be compared with at least the display of the molding machine controller Setting support method of injection molding machine and displaying.   The current cycle time includes an injection time for injection filling the mold during the injection process, a cooling time for cooling the resin in the mold, and an intermediate time from the end of the mold opening process to the start of the mold clamping process. 2. The method for supporting the setting of an injection molding machine according to claim 1, wherein a time obtained by adding is used.   2. The method for assisting setting of an injection molding machine according to claim 1, wherein a maximum value among a plurality of set heating cylinder temperatures is used as the heating cylinder temperature.   2. The setting support method for an injection molding machine according to claim 1, wherein the optimum cycle time is set on condition that the resin material does not exceed a preset residence time in which the resin material can stay inside the heating cylinder.   5. The injection molding machine setting support method according to claim 4, wherein the residence time is set on condition that the resin decomposition rate satisfies a range of 0.01 to 2 [wt%].   6. The injection molding machine setting support method according to claim 5, wherein the resin decomposition rate can be set to an arbitrary size.   The condition setting screen for setting the molding conditions is displayed on the display, and a second setting screen for displaying the optimum cycle time is displayed on the condition setting screen. Setting support method for injection molding machines.   8. The setting support method for an injection molding machine according to claim 7, wherein the second setting screen displays a window on the condition setting screen.   9. The setting support method for an injection molding machine according to claim 7, wherein a plurality of resin material selection keys capable of selecting a resin material to be used are displayed on the second setting screen.   9. The setting support method for an injection molding machine according to claim 7, wherein a resin decomposition rate setting unit capable of arbitrarily setting the resin decomposition rate is displayed on the second setting screen.

Images