JP4658887B2 - Data processing method for injection molding machine - Google Patents

Description

  The present invention relates to a data processing method of an injection molding machine for sequentially molding a predetermined molded product using a plurality of molds formed by exchanging some components for one injection device.

  Conventionally, an injection molding machine that sequentially molds the same molded product by using a plurality of molds formed by exchanging one mold (component) for one injection apparatus is disclosed in Japanese Patent Laid-Open No. 8-174594. There is known a rotary injection molding machine disclosed in Japanese Patent Publication No. JP-A.

The rotary type injection molding machine disclosed in the publication is identical in that two lower molds are attached to a rotating disk rotated by a rotation drive unit, and the lower mold is sequentially replaced with respect to the upper mold by rotating the rotating disk. Equipped with a basic structure consisting of two molds that are formed by replacing the lower mold with a single injection device that sequentially molds the molded product, so that the mold using one lower mold (rotary side mold) In addition to molding, the molded product can be taken out and inserted into the other lower mold (rotary side mold) during the molding.
JP-A-8-174594

  However, the above-described conventional injection molding machine (rotary injection molding machine) has the following problems.

  In other words, this type of injection molding machine sequentially molds the same molded product using a single injection device based on the same molding conditions, so that monitor data at the time of molding is usually sequentially fetched for each molding cycle (molding shot). In rare cases, data processing is performed. For example, when a quality determination process for a molded product is performed, the captured monitor data is sequentially displayed in time series on the monitor screen of the display unit, and monitoring is performed based on a preset monitor range. Then, if monitor data that has fluctuated due to an operation state or a resin state during molding is out of the monitor range, it is processed as a defective shot.

  On the other hand, in this type of injection molding machine, the same molded product is formed by a plurality of molds that are formed by replacing one injection device and the lower mold, and therefore the variation between the lower molds may be reflected in the monitor data. There is. Specifically, even if the lower mold cavity (core) has exactly the same shape, there is a variation in the relatively fine gate width communicating with the cavity (core), and this variation is reflected in the monitor data. It is also possible. In this case, the monitor display based on normal data processing can achieve a certain purpose of pass / fail judgment for the molded product, but it is not easy to confirm the state of variation between the lower molds. In particular, there is a limit to obtaining a stable and high molding quality in precision molded products, for example, the countermeasures cannot be taken quickly.

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

  In order to solve the above-described problem, the data processing method of the injection molding machine M according to the present invention has one mold Cy1 on the rotating plate 3 rotated by the rotation driving unit 2 with respect to one injection device Mi (Mi2). , Cy2 are attached, and the turntable 3 is rotated so that one mold Cy1, Cy2 is sequentially exchanged with respect to the other mold Cx, thereby using a plurality of molds C1, C2 to sequentially form a predetermined molded product. In the molding machine M to be molded, for each molding cycle, one mold Cy1, Cy2 at the time of molding is discriminated, monitor data D ... at the time of molding is taken in, and the captured monitor data D ... is taken as one mold Cy1, The data processing including at least the display processing of the monitor data D... Is performed by corresponding to Cy2.

  In this case, according to a preferred aspect of the invention, the determination of one of the molds Cy1 and Cy2 is performed by detecting the rotational position of the turntable 3 from the rotary encoder 5 that detects the rotation of the drive motor 4 constituting the rotational drive unit 2. be able to.

  According to the data processing method of the injection molding machine M according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) For each molding cycle, one mold Cy1, Cy2 at the time of molding is discriminated, monitor data D ... at the time of molding is taken in, and the captured monitor data D ... is made to correspond to one mold Cy1, Cy2. Since at least data processing including display processing of the monitor data D... Is performed, it is possible to easily check the variation state of one of the molds Cy1 and Cy2, and to take measures against the occurring variation. In particular, it is possible to obtain a stable and high molding quality in a precision molded product.

  (2) Since it was applied to one of the molds Cy1 and Cy2 constituting the molds C1 and C2, an insert molded product and a multicolor molded product having a stable and high molding quality can be obtained.

  (3) Since data processing including display processing of at least monitor data D ... is performed, in particular, the variation state of one of the molds Cy1 and Cy2 is easily confirmed, and countermeasures against the generated variation are promptly taken. Can be taken.

  (4) According to a preferred embodiment, when one of the molds Cy1 and Cy2 is discriminated, if the rotational position of the turntable 3 is detected from the rotary encoder 5 that detects the rotation of the drive motor 4 constituting the rotary drive unit 2, The rotational position of the turntable 3 can be detected without adding a separate detection unit, and one of the molds Cy1 and Cy2 can be easily and reliably discriminated.

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

  First, the principal part structure of the injection molding machine M which can implement the data processing method which concerns on this embodiment is demonstrated with reference to FIGS.

  FIG. 2 shows the main structure of an injection molding machine M, particularly a vertical injection molding machine. The injection molding machine M includes a mold clamping device Mc and an injection device Mi. The mold clamping device Mc includes a turntable 3 having a circular plan view, a lower support plate 11 that supports the turntable 3, and an upper support plate 12. The two lower molds, that is, the first lower mold Cy1 and the second lower mold Cy2 are attached in positional relation, and the upper mold Cx is attached to the lower surface of the upper support board 12. Accordingly, the upper support plate 12 or the lower support plate 11 is relatively displaced by a mold clamping drive unit (not shown), and the upper mold Cx and the first lower mold Cy1 or the upper mold Cx and the second lower mold Cy2 are closed. Clamping and mold opening can be performed. In addition, a rotation drive unit 2 that rotates the rotating disk 3 in units of 180 ° is provided. The rotation drive unit 2 includes a drive motor 4 that is attached to the lower surface of the lower support plate 11 and has a built-in speed reduction mechanism. The rotation shaft 4 s of the drive motor 4 passes through an insertion hole provided in the lower support plate 11. Combining with the center. The drive motor 4 is provided with a rotary encoder 5 that detects the rotation of the drive motor 4.

  On the other hand, 21 is a molding machine controller that controls the entire injection molding machine M, and includes a mold discrimination function unit Fd that discriminates at least the first lower mold Cy1 and the second lower mold Cy2, and other than the mold discrimination function unit Fd. A controller body 22 having various processing functions is provided. This type discriminating function unit Fd has a function of discriminating between the first lower die Cy1 and the second lower die Cy2 by using the detection signal (encoder pulse) obtained from the rotary encoder 5 and detecting the rotational position of the turntable 3. Have. Further, a display setting unit 24 including an input key (touch panel) and the like is connected to the input side of the controller body 22. The display setting unit 24 can set and select various display modes. Further, a display unit 23 using a color liquid crystal display or the like is connected to the output side of the controller body 22.

  3 and 4 show monitor screens V1 and V2 displayed on the display unit 23. FIG. The monitor screen V1 shown in FIG. 3 displays the monitor data D... For each molding cycle in a graph. The first lower mold display area A1 displays the monitor data D related to the first lower mold Cy1. The second lower mold display area A2 for displaying the monitor data D ... relating to the second lower mold Cy2, the common display area Ac for displaying the common monitor data D ..., and the scroll key display section As displaying a plurality of scroll keys. Have In this case, the display modes of the first lower mold display area A1 and the second lower mold display area A2 are basically the same. In the illustrated example, “injection filling time”, “injection start position”, “injection end” Three monitor items of “position” are displayed. For one monitor item, for example, “injection filling time”, the item display unit 31, the unit display unit 32, the reference value display unit 33, the monitoring width display unit 34, and the data display unit 35 are displayed. The data display unit 35 plots and displays the monitor data D... For each molding cycle with dots (graph display), and performs pass / fail determination based on the data set in the reference value display unit 33 and the monitoring width display unit 34. Similar display sections 31 to 35 are displayed for other monitor items. In the example, the monitor items in the common display area Ac are “oil temperature” and “cycle time”.

  The monitor screen V2 displays the monitor data D ... for each molding cycle as a numerical value, and, similarly to the monitor screen V1, displays the monitor data D ... related to the first lower mold Cy1. Display area B1, second lower mold display area B2 for displaying monitor data D ... related to second lower mold Cy2, common display area Bc for displaying common monitor data D, and a plurality of scroll keys. It has a scroll key display section Bs. In this case, the display modes of the first lower mold display area B1 and the second lower mold display area B2 are basically the same. In the illustrated example, “injection filling time”, “injection start position”, “injection end” Three monitor items of “position” are displayed. An item display unit 41, a unit display unit 42, and a data display unit 43 are displayed for one monitor item, for example, “injection filling time”. The data display unit 43 displays the monitor data D for each molding cycle as a numerical value, and in particular, “latest value”, “1 shot before”, “2 shots before”, “3 shots before”, “9 shots before” Can be displayed as well as “maximum value”, “minimum value”, “average value”, and “standard deviation” with respect to the monitor data D for each monitor item. At this time, the monitor data D for each cycle is alternately displayed on the first lower mold display area B1 and the second lower mold display area B2. Similar display portions 41 to 43 are displayed for other monitor items. In the example, the monitor items in the common display area Bc are “oil temperature”, “cycle time”, and “cycle time”.

  Next, a data processing method according to the present embodiment using the injection molding machine M having such a configuration will be described according to the flowchart shown in FIG. 1 with reference to FIGS.

  First, as shown in FIG. 2, the first lower mold Cy <b> 1 and the second lower mold Cy <b> 2 are attached to the upper surface of the rotating disk 3, and the upper mold Cx is attached to the lower surface of the upper support board 12. Thus, the first lower mold Cy1 and the upper mold Cx are combined to form the first mold C1, and the second lower mold Cy2 and the upper mold Cx are combined to configure the second mold C2. The

  On the other hand, the main part operation at the time of production operation is as follows. Now, it is assumed that the turntable 3 has been rotated 180 [°] in order to end an arbitrary molding process and shift to the next molding process (step S1). In this case, the drive motor 4 operates based on the rotation command output from the controller main body 22, and the rotating disk 3 rotates in the arrow R direction around the rotating shaft 4s. Further, the rotation of the drive motor 4 is detected by the rotary encoder 5 and is rotated in units of 180 ° by performing position control of the rotating disk 3 based on a detection signal (encoder pulse) obtained from the rotary encoder 5. On the other hand, the detection signal obtained from the rotary encoder 5 is also given to the mold discrimination function unit Fd in the molding machine controller 21. Thereby, the type | mold discrimination | determination function part Fd detects the rotation position of the turntable 3, and discriminate | determines the lower mold | type Cy1 or Cy2 which faces the upper mold | type Cx based on this detection result (step S2). In the example, the first lower mold Cy1 is determined. As described above, if the rotational position of the turntable 3 is detected from the rotary encoder 5 attached to the drive motor 4, and one of the lower molds Cy1 and Cy2 is discriminated based on this position, a separate detection unit is added. It is possible to easily and reliably make a determination without doing so.

  Next, a series of molding operations is performed (step S3). That is, the mold closing process and the mold clamping process are performed in the mold clamping apparatus Mi, and the nozzle touch of the injection apparatus Mi is performed on the mold C1, and then the molten resin is injected from the injection apparatus Mi to the mold C1. A filling step, a pressure holding step, and a cooling step are performed. During the molding operation, predetermined monitor data D ... is detected (step S4). In the illustrated example, the monitor data D is “injection filling time”, “injection start position”, “injection end position”, “oil temperature”, and “cycle time”.

  The detected monitor data D... Is written in a predetermined data memory in the controller main body 22. At this time, since the type discrimination function unit Fd discriminates the first lower die Cy1, the detected monitor data D... Is written in the data area for the first lower die Cy1 (steps S5 and S6). . The detected monitor data D is displayed on the monitor screen V1 shown in FIG. 3 or the monitor screen V2 shown in FIG. 4 (step S7). In this case, the monitor screen V1 or the monitor screen V2 selected by the display setting unit 24 can be selectively displayed on the display unit 23. Since the detected monitor data D ... corresponds to the first lower mold Cy1, it is displayed in the first lower mold display area A1 in the monitor screen V1 and in the first lower mold display area B1 in the monitor screen V2. Is displayed. In particular, the first lower mold display area B1 is displayed in the "latest value" column.

  In addition, using the time during the molding operation, for the other second lower mold Cy2, the molded product molded immediately before is taken out by the robot (or operator), and the set of insert parts is set. Done. When the molding operation is completed, a mold opening process is performed, and the turntable 3 is rotated 180 [deg.] (Steps S8, S9, S1). In this case, as described above, the rotational position of the turntable 3 is detected by the type discriminating function unit Fd, and the lower die Cy1 or Cy2 facing the upper die Cx is discriminated based on the detection result (step S2). In this example, the second lower mold Cy2 is determined.

  Next, a series of molding operations are performed, and predetermined monitor data D is detected during the molding operation (steps S3 and S4). The detected monitor data D... Is written in the data memory in the controller main body 22. At this time, since the type discrimination function unit Fd discriminates the second lower die Cy2, the detected monitor data D... Is written in the data area for the second lower die Cy2 (steps S5 and S10). . Further, the detected monitor data D ... is displayed on the monitor screen V1 shown in FIG. 3 or the monitor screen V2 shown in FIG. 4 (step S11). In this case, the detected monitor data D... Corresponds to the second lower mold Cy2, so that it is displayed in the second lower mold display area A2 on the monitor screen V1 and the second lower mold display on the monitor screen V2. It is displayed in the area B2. In particular, in the second lower mold display area B2, it is displayed in the “latest value” column, and the monitor data D... Detected in the immediately preceding molding operation is changed and displayed in the “one shot before” column. Thereafter, similar operations are sequentially repeated (steps S8, S9, S1,...).

  Therefore, according to such a data processing method according to the present embodiment, for each molding cycle, the lower molds (component parts) Cy1, Cy2 at the time of molding are discriminated, and monitor data D ... Since the received monitor data D is processed in correspondence with the lower molds Cy1 and Cy2, the variation state of the lower molds Cy1 and Cy2 can be easily confirmed, and the generated variations Countermeasures such as correction, replacement or analysis of the lower mold Cy1 or Cy2 can be taken promptly, and in particular, a stable and high molding quality can be obtained in a precision molded product. Moreover, since it applied to lower mold | type Cy1 and Cy2 which comprise metal mold | die C1, C2 as component parts (Cy1, Cy2), the insert molded product and multicolor molded product which have the stable high molding quality can be obtained. In addition, since the data processing includes at least the display processing of the monitor data D ..., in particular, the variation state of the lower molds Cy1 and Cy2 can be easily checked, and measures against the variation occurring can be taken promptly. Can do.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and departs from the gist of the present invention in the detailed configuration, shape, material, quantity, numerical value, and the like. It can be changed, added, or deleted as long as it is not.

  For example, FIGS. 1 to 4 illustrate a vertical injection molding machine that performs insert molding, but a horizontal injection molding machine that performs two-color molding (multicolor molding) as shown in FIG. 5 may be used. In this case, two injection devices Mi1 and Mi2 are mounted. However, when focusing on the injection device Mi2 that performs the injection of the second color, some component parts Cy1 and Cy2 are exchanged for one injection device Mi. Thus, an injection molding machine M that sequentially molds a predetermined molded product by using a plurality of molds C1 and C2 is included. In FIG. 5, the same reference numerals are given to portions that exhibit the same functions as those of the injection molding machine M shown in FIG. 2 to clarify the configuration, and detailed description thereof is omitted.

  Moreover, although the case where it comprises by replacing | exchanging several lower mold | type Cy1, Cy2 as several metal mold | die C1, C2 was shown, it may be the case where it comprises by replacing | exchanging several upper mold | type Cx ... Although two molds C1 and C2 are illustrated as the molds C1 and C2, three or more molds may be used. In addition, although the case where the same molded product was shape | molded as a molded product was shown, it is not necessarily limited to the same molded product, The case where a different molded product is shape | molded may be sufficient. In the case of different molded products, there is an advantage that, for example, the variation for each molded product can be monitored on the same screen, and the monitor items of the common part can be shared and displayed, so that convenience can be improved. On the other hand, the display processing is shown in the case where the first lower mold display areas A1 and B1 and the second lower mold display areas A2 and B2 are displayed. However, the first lower mold display areas A1 and B1 are displayed as necessary. Alternatively, only one of the second lower mold display areas A2 and B2 may be displayed. Furthermore, the display processing of the monitor data D... Is exemplified as the data processing, but various data processing such as printing processing and statistical processing may be included. In addition, the present invention can be applied to various types of injection molding machines M, and can be applied regardless of whether it is an electric injection molding machine or a hydraulic injection molding machine.

The flowchart for demonstrating the data processing method which concerns on best embodiment of this invention, The block diagram which shows the principal part of the injection molding machine which can implement the data processing method, Monitor screen diagram that displays monitor data by the same data processing method, Other monitor screens that display monitor data using the same data processing method, The block diagram which shows the principal part of the injection molding machine which concerns on the modified embodiment of this invention,

Explanation of symbols

  2: rotational drive unit, 3: rotating disk, 4: drive motor, 5: rotary encoder, M: injection molding machine, Mi: injection device, Mi2: injection device, Cy1: component (one mold, lower mold), Cy2: component (one mold, lower mold), Cx: the other mold, C1: mold, C2: mold, D ...: monitor data

Claims (2)

  For one injection device, a plurality of molds are formed by attaching a plurality of molds to a rotating disk rotated by a rotation drive unit, and sequentially exchanging the one mold with respect to the other mold by rotating the rotating disk. In the data processing method of an injection molding machine when sequentially molding a predetermined molded product by using a mold, the one mold at the time of molding is discriminated for each molding cycle, and monitor data at the time of molding is captured. A data processing method for an injection molding machine, wherein data processing including at least display processing of the monitor data is performed by making the captured monitor data correspond to the one mold.   2. The injection molding machine according to claim 1, wherein the determination of the one mold is performed by detecting a rotation position of the rotating disk from a rotary encoder that detects rotation of a drive motor constituting the rotation driving unit. Data processing method.

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