JP4982273B2 - Data display method of molding machine - Google Patents

Description

  The present invention relates to a data display method for a molding machine suitable for use in displaying graph data relating to motor torque detected during operation of a toggle link type mold clamping device.

  2. Description of the Related Art An injection molding machine equipped with a toggle link type mold clamping device that includes a drive unit having a servo motor and a ball screw mechanism and transmits the advance / retreat movement of the drive unit to a movable platen by a toggle link mechanism is known. By the way, in this type of mold clamping device, there is a risk of damaging the mold if a foreign object is caught between the movable mold and the fixed mold when the mold is closed. The mold protection section is set after the mold closing process.

  Conventionally, as a method for monitoring the presence or absence of foreign matter in such a monitoring section, a foreign matter detection method for an injection molding machine disclosed in Patent Document 1 and a mold clamping control method for an injection molding machine disclosed in Patent Document 2 are known. It has been.

  The former foreign object detection method detects a physical quantity associated with the mold closing operation in the monitoring section in the mold clamping process, and if the deviation between the detected value of the physical quantity and a preset set value exceeds a preset threshold value, the foreign substance is detected. A detection process is performed, and in particular, a maximum value of the deviation is detected by performing trial mold clamping in advance, and a threshold is set by adding the maximum value to a preset reference value. In the monitoring section, a torque limit signal is given to the servo circuit to limit the torque output so that the torque limit value is set in advance. This prevents the harmful effect of applying a large pressure. Accordingly, the torque limit value at this time is a fixed torque limit value set manually.

The latter mold clamping control method detects a load torque in a predetermined monitoring section set for the mold closing operation of the mold clamping process, and if the detected torque value obtained by the detection reaches a set torque limit value. When performing torque control so as not to exceed the torque limit value, an automatic setting mode is provided. With this automatic setting mode, torque detection values in the monitoring section are sequentially detected by a preset sampling cycle and set in advance. In addition to detecting the number of shots, the torque limit value for each sampling order is obtained from the obtained torque detection value by a predetermined arithmetic expression and automatically set. Accordingly, the torque limit value at this time is an automatically set torque limit value that varies in accordance with a predetermined condition.
JP 2002-172670 A JP 2004-330528 A

  However, the conventional method for monitoring foreign matter in the monitoring section (mold protection section) described above has the following problems to be solved.

  In other words, all of the conventional methods use the motor torque as the monitoring target in the monitoring section. When a foreign object is caught in the mold, the torque (load) of the motor increases correspondingly, and therefore the presence or absence of the foreign object can be detected (monitored) by setting a threshold value. Since the monitoring section is set for the purpose of monitoring foreign matter, the purpose of monitoring the presence or absence of foreign matter can be sufficiently achieved by monitoring the motor torque regardless of the type of mold clamping device.

  By the way, when the mold clamping device pays attention to the mold clamping principle, there are a direct pressure type mold clamping device and a toggle link type mold clamping device. In the direct pressure type mold clamping device, since the actual mold closing force in the mold changes in direct proportion to the torque of the motor that drives the mold clamping mechanism, the enlargement ratio for the mold closing force does not change. In the clamping device, the actual mold closing force is increased by a predetermined expansion rate with respect to the torque of the motor that drives the toggle link mechanism, so that a considerable mold closing force is generated near the end of the monitoring section.

  On the other hand, it is necessary to set the torque limit value for monitoring the presence or absence of foreign matter, the size of the threshold or the monitoring conditions on the user side according to the type of the molded product, the molding conditions, and the like. Therefore, for example, when a user of an injection molding machine equipped with a direct pressure type clamping device introduces a new injection molding machine equipped with a toggle link type clamping device, the direct pressure type clamping device was used. The know-how and feeling (intuition) related to the setting of the torque limit value (threshold value) and the monitoring condition for monitoring the presence or absence of foreign matter at the time cannot be used. After all, the setting work is troublesome and the setting time is prolonged, which not only decreases the work efficiency, but also leads to inappropriate setting or incorrect setting, which can lead to reliable mold protection. Is not enough.

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

  In order to solve the above-described problem, the data display method of the molding machine according to the present invention operates when a mold clamping device Mc that opens / closes and molds the mold C via the toggle link mechanism 3 driven by the motor 2 is operated. When the torque T of the motor 2 is detected at a predetermined sampling interval and at least the graph data Dtd, Dtc, and Dts related to the detected torque T are displayed on the display 4, at least the graph data Dtd, Dtc, and Dts related to the torque T are displayed. In addition to the graph data Dtd related to the actually measured torque value Td, at least the fixed torque limit value Tsc set manually and / or the graph data Dtc related to the automatically set torque limit value Tss that fluctuates according to a predetermined condition , Dts, and graph data related to the torque command value. Graph data related to torque T Graph data Dtd, Dtc, Dts are converted into graph data Dfd, Dfc, Dfs related to the mold closing force F of the mold C, and the mold closing position X of the mold C when the torque T is detected Is obtained from the database 5 in which the relationship between the mold closing time t and the mold closing position X at the normal mold closing time is registered, and graph data Dfd, Dfc, Dfs relating to the mold closing force F with respect to the mold closing position X is obtained. Is displayed on the display 4 in place of the graph data Dtd, Dtc, Dts related to the torque T or in addition to the graph data Dtd, Dtc, Dts related to the torque T. .

  In this case, according to a preferred aspect of the invention, the conversion from the graph data Dtd, Dtc, Dts related to the torque T to the graph data Dfd, Dfc, Dfs related to the mold closing force F of the mold C is performed by a predetermined calculation. Equation (102) can be used.

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

  (1) Even with the toggle link type mold clamping device Mc, the magnitude of the actual mold closing force F in the mold C can be easily and accurately grasped. Therefore, it is possible to contribute to improvement in work efficiency by facilitating and speeding up various setting operations, and it is possible to realize more reliable mold protection. In particular, even when the direct pressure type clamping device is changed to the toggle link type clamping device, the user can easily and accurately set the torque limit value, threshold value, monitoring condition, etc. when monitoring the presence or absence of foreign matter. Can do.

  (2) The graph data Dtd, Dtc, and Dts related to the torque T include the graph data Dtc, Dts related to the torque limit values Tsc and Tss, and the graph data related to the torque command value in addition to the graph data Dtd related to the actual torque value Td. Therefore, the magnitude of the mold closing force F actually generated and the magnitude of the mold closing force F corresponding to the torque limit values Tsc, Tss or the torque command value can be grasped simultaneously. It is possible to easily and accurately grasp the level of the mold closing force F.

  (3) Since the torque limit values Tsc and Tss include at least a fixed torque limit value Tsc that is manually set and / or a torque limit value Tss that is automatically set and fluctuates corresponding to a predetermined condition, Both the setting mode and the automatic setting mode can be supported. Especially, in the manual setting mode, it can be used as a setting support tool for the fact that automatic setting is not performed, and in the automatic setting mode, it can be set for automatic setting. Can be used as a confirmation tool.

  (4) Since the mold closing position X is obtained from the registered database 5 that is set in advance, the relationship between the mold closing time t and the mold closing position X at the time of normal mold closing is obtained, position detection by the position sensor becomes unnecessary. In addition, since the mold closing time t can be reflected in the mold closing position X, more diverse display can be performed.

  (5) When the graph data Dtd, Dtc, Dts relating to the torque T is converted into the graph data Dfd, Dfc, Dfs relating to the mold closing force F of the mold C according to a preferred embodiment, a predetermined calculation set in advance. If Formula (102) is used, the exact and reliable mold closing force F can be calculated | required easily.

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

  First, the outline | summary of the injection molding machine M which can implement the data display method which concerns on this embodiment is demonstrated with reference to FIGS.

  In FIG. 5, M indicated by an imaginary line is an injection molding machine, and includes a machine base Mb, an injection device Mi and a toggle link type clamping device Mc installed on the machine base Mb. The injection device Mi includes a heating cylinder 11, which has a hopper 12 for supplying a material to the rear part, and has an injection nozzle 13 at the front end as shown in FIG. A screw 14 is provided. On the other hand, a side panel 15 is erected on the machine base Mb, and a display 4 with a touch panel using a color liquid crystal display or the like is disposed on the side panel 15. This display 4 is connected to a controller 34 (FIG. 6) described later.

  FIG. 6 shows the configuration of the mold clamping device Mc in detail. The mold clamping device Mc includes a fixed platen 21c and a drive platen 21 that are spaced apart from each other, and the fixed platen 21c and the drive platen 21r are fixed on the machine base Mb (FIG. 5). Four tie bars 22 are installed between the fixed plate 21c and the drive plate 21r, and the movable plate 21m is slidably loaded on the tie bars 22. The movable plate 21m is attached with a movable mold Cm, and the fixed plate 21c is fitted with a fixed mold Cc. A mold C is constituted by the movable mold Cm and the fixed mold Cc. A drive mechanism 23 is disposed between the drive board 21r and the movable board 21m. The drive mechanism 23 includes a servo motor 2 attached to the drive board 21r, a ball screw part 24s rotatably supported by the drive board 21r, and a nut part 24n screwed to the ball screw part 24s. In addition to a screw mechanism 24 and a drive unit 26 including a rotation transmission mechanism 25 that transmits the rotation of the servo motor 2 to the ball screw unit 24s, a toggle link mechanism 3 attached between the drive platen 21r and the movable platen 21m is provided. The toggle link mechanism 3 is configured by a combination of a plurality of toggle link members 3r... And a cross head 3h serving as an input portion is fixed to the nut portion 24n. As a result, the ball screw portion 24s is rotated by the operation of the servo motor 2, and the forward / backward movement of the nut portion 24n is transmitted to the movable platen 21m via the toggle link mechanism 3, whereby the mold C is opened and closed and clamped. Done. Reference numeral 27 denotes an ejector mechanism.

  On the other hand, 31 indicates a control system. In the control system 31, reference numeral 32 denotes a servo circuit. The servo circuit 32 is connected to the servo motor 2 and the rotary encoder 33 attached to the servo motor 2, and the servo circuit 32 is connected to the controller 34. The controller 34 has a computer function that governs overall control of the injection molding machine M, and executes various arithmetic processes and various control processes. Further, the controller 34 is connected to the display 4 described above and incorporates a memory 35. Various data can be written in the memory 35, and the relationship between the mold closing time t and the mold closing position X at the time of normal mold closing described later is registered as the database 5. Furthermore, the memory 35 stores various processing programs including a PLC program and an HMI program. 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. These software are constructed as a unique architecture of the injection molding machine M on which the controller 34 is mounted, and in particular, display processing related to the data display method according to the present embodiment can be executed.

  FIG. 7 shows a specific configuration of the servo circuit 32. The servo circuit 32 includes deviation calculation units 41 and 42, an adder 43, a position loop gain setting unit 44, a feed forward gain setting unit 45, an acceleration / deceleration time setting unit 46, a speed converter 47, a speed loop gain setting unit 48, a driver. 49, a torque comparison processing unit 50, a torque differentiator 51, and a torque differential comparison processing unit 52, respectively, and a servo control system is constituted by the system shown in FIG. The function (operation) of each part will be described with reference to the overall operation of the mold clamping device Mc described later.

  On the other hand, FIG. 2 shows a mold opening / closing screen Vm displayed on the display 4 by the data display method according to the present embodiment. In this case, a plurality of screen switching keys K1 provided for each screen item for switching various screens are displayed on the display 4 in the upper and lower stages. The upper stage includes a mold opening / closing screen switching key K1, an ejector screen switching key K2, an injection / metering screen switching key K3, a temperature screen switching key K4, a monitor screen switching key K5, a main condition screen switching key K6, and a condition switching screen switching key K7. The first group Au related to the setting of the operating condition of the molding machine having the above is arranged in a horizontal row, and in the lower stage, the other setup screen switching key K8, process monitoring screen switching key K9, production information screen switching A second group Ad having a key K10, a waveform screen switching key K11, a history screen switching key K12, and a support screen switching key K13 is arranged in a horizontal row. The second group Ad is in a state where the first layer is displayed, but can be replaced with another screen switching key by selecting (ON) the layer screen switching key Kc at the right end of the screen.

  Therefore, when the operator (user) selects (ON) the mold opening / closing screen switching key K1, the display 4 displays the mold opening / closing screen Vm shown in FIG. The mold opening / closing screen Vm has a graph display unit 61 at an intermediate position. In the graph display unit 61, graph data related to the torque T shown in FIG. The graph data Dtd of the measured torque value Td and the graph data Dtc and Dts of the torque limit values Tsc and Tss, or the graph data related to the mold closing force F shown in FIGS. Graph data Dfd, Dfc, Dfs related to the mold closing force F at the mold closing position X of C can be selectively displayed.

  Further, as shown in FIG. 2, a mold protection mode switching key 62 is provided at the upper left of the mold opening / closing screen Vm, and a display switching key 63 is provided at the lower left of the mold opening / closing screen Vm. The mold protection mode switching key 62 is a switching key for switching between a “fixed” mode and a “high accuracy” mode. In this case, the “fixed” mode is a mode in which a fixed (constant) torque limit value Tsc is manually set. Therefore, the user can set an arbitrary torque limit value Tsc numerically on a setting screen (not shown). On the other hand, the “high accuracy” mode is a mode in which a torque limit value Tss that varies in accordance with a predetermined condition is automatically set, and the torque limit value Tss is set as follows.

  First, initial setting of the torque limit value Tss is performed by trial molding. At this time, the torque limit is released. The servo motor 2 is actuated by the start of the trial molding, and the movable platen 21m is moved at a high speed from the mold opening position in the mold closing direction at a high speed. In this case, the servo circuit 32 performs speed control and position control on the movable platen 21m. Specifically, a position command value is given from the controller 34 to the deviation calculation unit 41 of the servo circuit 32 and compared with a position detection value obtained based on a detection pulse of the rotary encoder 33, thereby the position deviation is reduced. can get. Then, position feedback control is performed based on the position deviation. At this time, the position deviation is compensated by the position loop gain setting unit 44, the feed forward gain setting unit 45, and the acceleration / deceleration time setting unit 46. The output of the acceleration / deceleration time setting unit 46 is given to the deviation calculation unit 42 and compared with the output of the speed converter 47 to obtain a speed deviation. Then, speed feedback control is performed based on the speed deviation. At this time, the speed deviation is compensated by the speed loop gain setting unit 48.

  When the movable platen 21m moves forward in the mold closing direction and reaches the start point of a preset mold protection section (monitoring section), the torque T is detected at each set sampling period. The mold protection section can be set between a low pressure mold clamping (low speed mold closing) start point and a high pressure mold clamping start point. The torque T is detected by taking in the speed control signal Sc output from the speed loop gain setting unit 48. That is, since the magnitude of the speed control signal Sc corresponds to the magnitude of the torque T, the voltage value of the speed control signal Sc is used as the torque detection value Tdo. Torque detection values Tdo... Detected at each sampling period are written into the data area of the memory 35 via the controller 34. Such detection processing of the torque detection value Tdo is executed at every sampling period until the mold protection section is completed.

  Further, when the first shot (molding cycle) is completed, the next shot is performed, the torque detection value Tdo... Is detected in the same manner, and the same detection for the torque detection value Tdo. Do only N minutes. When the detection for the number of shots N is completed, an average value Ai for the torque detection values Tdo... Of the same sampling order in each shot is calculated from the obtained torque detection values Tdo. Further, the maximum value Aw is selected from the detected torque values Tdo. As the maximum value Aw, the largest maximum value among a plurality of sampling orders in a predetermined range set for the preceding and succeeding sampling orders is selected.

Then, from the obtained average value Ai and maximum value Aw, a torque limit value Tss for each sampling order is obtained,
Tss = Qi + kq = [{(Aw−Ai) × kp} + Ai] + kq (100)
Obtained by the following equation. In this case, Qi is a reference value. Kp and kq are constants, kq is a constant for setting a predetermined margin (offset) with respect to the reference value Qi, and kp is normally set to an arbitrary number between “1 and 2”. be able to. The median value Aj can be used instead of the average value Ai. That is, the minimum value As and the maximum value Aw for the torque detection values Tdo of the same sampling order in each shot are obtained, and the median value Aj is calculated from the minimum value As and the maximum value Aw by Aj = (Aw−As) / 2 While calculating | requiring by Formula, from this median value Aj and maximum value Aw, each torque limiting value Tss is
Tss = [{(Aw−Aj) × kp} + Aj] + kq (101)
It can also obtain | require by the computing equation of. The constants kp and kq may be the same value as the constants kp and kq described above, or may be different as necessary.

  On the other hand, the obtained torque limit values Tss... Are automatically set in the memory 35 as a pair with the corresponding mold closing time t. A series of processes for obtaining the torque limit values Tss... Are automatically executed by a sequence operation set by selecting the automatic setting mode. Further, the setting of the threshold Di for detecting foreign matter in the monitoring section is performed in the same manner as the initial setting of the torque limit value Tss.

  Further, the initially set torque limit values Tss and threshold values Di are periodically set by the activation of the automatic setting mode every time the number of shots that satisfy a predetermined condition reaches a preset number M during production operation. Automatically updated. As for these setting method and updating method, the setting method and updating method disclosed in JP-A-2004-330528 can be used.

  Further, the relationship between the mold closing time t and the mold closing position X at the time of normal mold closing in the mold clamping process (mold closing process) is set as the database 5 from the sampling result described above. That is, since at least the mold closing time t and the mold closing position X are obtained for each predetermined sampling period, for example, the teaching amount (several times) is continuously collected from the obtained results, and the mold of each sampling order is obtained. The average of the closing time t and the mold closing position X is calculated and stored (registered) in the memory 35 as the database 5. This database 5 may be an independent database or a database together with data such as torque limit values Tss..., Threshold values Di. The mold closing position X is the position of the movable mold Cm when the mold is closed.

  As described above, if the torque limit values Tsc and Tss include at least the fixed torque limit value Tsc that is manually set and / or the torque limit value Tss that is automatically set and fluctuates according to a predetermined condition, Both the setting mode and the automatic setting mode can be supported. Especially, in the manual setting mode, it can be used as a setting support tool for the fact that automatic setting is not performed, and in the automatic setting mode, it can be set for automatic setting. There is an advantage that can be used as a confirmation tool.

  Next, a data display method of the molding machine according to the present embodiment will be described with reference to FIGS.

  First, in order to facilitate understanding of the data display method according to the present embodiment, the operation of the mold clamping process during production operation will be described. In the mold clamping process, the servo motor 2 is operated, and first, high-speed mold closing is performed in which the movable platen 21m moves forward at high speed from the mold opening position to the mold closing direction. At this time, the servo circuit 32 performs speed control and position control on the movable platen 21m.

  When the movable platen 21m moves in the mold closing direction and reaches the low pressure mold clamping (low speed mold closing) start point, which is the starting point of the mold protection section (monitoring section), the torque T is detected at every predetermined sampling period. Are written in the data area of the memory 35 as the actual torque values Td. Therefore, these processes are performed in the same manner as in the case where the torque limit value Tss described above is initially set. The detected actual torque values Td are also given to the torque differentiator 51, differentiated by the torque differentiator 51, and the differentiated differential detection value Dd is given to the torque differentiation comparison processing unit 52. . The torque differential comparison processing unit 52 is given a threshold value Di set in the same sampling order as the differential detection value Dd from the controller 34, and the threshold value Di and the differential detection value Dd of the same sampling order are compared. Therefore, when a foreign object is caught between the movable mold Cm and the fixed mold Cc, the torque suddenly increases when the foreign object is caught, that is, the speed control signal Sc and the differential detection value Dd obtained from the torque differentiator 51 are also obtained. Since the value suddenly increases, the differential detection value Dd exceeds the threshold value Di. As a result, the torque differential comparison processing unit 52 detects that a foreign object is caught, and gives the foreign object detection signal Se from the servo circuit 32 to the controller 34. On the other hand, if the normal operation is continued without any foreign matter being caught, the differential detection value Dd does not exceed the threshold value Di, so that the detection process of the differential detection value Dd is repeated as it is for each set sampling period. .

  On the other hand, the actual torque value Td detected for each sampling period is also given to the torque comparison processing unit 50. The torque comparison processing unit 50 is given a torque limit value Ts having the same sampling order as the torque actual measurement value Td from the controller 34, and the torque limit value Ts and the torque actual measurement value Td in the same sampling order are compared. When the measured torque value Td increases and reaches the torque limit value Ts, torque control processing by the controller 34 and the servo circuit 32 is performed so as not to exceed the torque limit value Ts. Further, when the movable platen 21m reaches the low pressure end position where the low pressure mold clamping ends, that is, the high pressure mold clamping start position by the end of the monitoring section, the high pressure mold clamping by the high pressure control is performed, and a predetermined molding operation is performed. When finished, mold opening is performed.

  Next, the data display method of the molding machine according to the present embodiment will be described according to the flowchart shown in FIG. 1 with reference to the drawings.

  It is assumed that the mold protection mode switching key 62 has been switched to the “high accuracy” mode (step S1). The mold protection mode switching key 62 can also be switched to the “fixed” mode (step S2). Since the “fixed” mode is a mode manually set by the user, when the “fixed” mode is selected, the torque limit value Tsc fixed (fixed) by the set numerical value functions.

  The display switching key 63 is switched to the standard “torque” display mode unless operated. As a result, at least in the mold protection section of the mold clamping process (mold closing process), as shown in FIG. 3A, the mold is opened and closed with the measured torque values Td... With the horizontal axis as the mold closing time t as graph data Dtd. It displays on the graph display part 61 of the screen Vm. Further, preset torque limit values Tss... Are read from the memory 35, and the graph data Dts of the torque limit values Tss... Are displayed on the graph display unit 61 in synchronization with the mold closing time t of the measured torque values Td. Step S3). Since the torque limit value Tsc is a constant value set by the user, the graph display unit 61 displays the graph data Dtc as a single straight line horizontally. The display of the graph data Dtd... On the graph display unit 61 relating to the torque T is continued unless the selection of the mold opening / closing screen switching key K1 is released (step S4).

  As described above, if the graph data Dtd, Dtc, and Dts related to the torque T include at least the graph data Dtd related to the actually measured torque value Td and / or the graph data Dtc and Dts related to the torque limit values Tsc and Tss, Since the magnitude of the mold closing force F generated at the same time and the magnitude of the mold closing force F corresponding to the torque limit values Tsc, Tss can be grasped at the same time, what level is there for the excessive mold closing force F, etc. There is an advantage that can be grasped easily and accurately.

  By the way, in the case of the toggle link mechanism 3, the actual mold closing force F in the mold C cannot be grasped by the display of the graph data Dtd, Dtc, Dts related to the torque T. For this reason, for example, when a user of an injection molding machine equipped with a direct pressure type clamping device introduces a new injection molding machine M equipped with a toggle link type clamping device Mc, the direct pressure type clamping device is used. The know-how and feeling (intuition) related to the setting of the torque limit value (threshold value) and the monitoring conditions for monitoring the presence or absence of foreign matter at the time cannot be used. In the end, setting work is troublesome and setting time is prolonged, which not only reduces work efficiency but also warps inappropriate setting or erroneous setting, and thus more reliable mold protection is achieved. It is not preferable from the viewpoint.

  Therefore, the user can change the display of the graph data Dtd, Dtc, Dts related to the torque T to the display of the graph data Dfd, Dfc, Dfs related to the mold closing force F (step S5). In this case, the user operates the display switching key 63 to switch the “torque” display mode to the “mold closing force” display mode (step S6). Thereby, as shown in FIG. 2 and FIG. 3B, the graph data Dfd, Dfc, and Dfs related to the mold closing force F are switched and displayed (step S7).

In this case, the mold closing force F of the mold C is obtained from the torque T at every predetermined sampling interval, and the mold closing position X of the mold C at the time of detecting the torque T obtained from the mold closing force F is obtained. Specifically, it can be obtained by a predetermined arithmetic expression set in advance,
F = {(2πRTη) / Np} · k (x) (102)
Can be used. In this equation, R is the reduction ratio, T is the torque [Nmm], η is the mechanical efficiency, Np is the pitch of the ball screw [mm], and k (x) is a coefficient that varies depending on the mold closing position X.

  When the manually set fixed torque limit value Tsc is converted into the graph data Dfc related to the mold closing force F, the mechanical efficiency η of this arithmetic expression can be set to around “0.5”. Further, when converting the actually measured torque value Td into the graph data Dfd related to the mold closing force F, and when converting the automatically set torque limit value Tss to the graph data Dfs related to the mold closing force F, this calculation is performed. The mechanical efficiency η in the equation can be set around “0.9”. As described above, a predetermined arithmetic expression (102) set in advance is used to convert the graph data Dtd, Dtc, Dts related to the torque T to the graph data Dfd, Dfc, Dfs related to the mold closing force F in the mold C. Thus, an accurate and reliable mold closing force F can be easily obtained.

  The mold closing position X is obtained from the database 5 in which the relationship between the mold closing time t and the mold closing position X at the normal mold closing time is registered. That is, the mold closing position X corresponding to the mold closing time t at which the torque T is detected is read from the database 5. Thus, if the mold closing position X is obtained from the registered database 5 in relation to the mold closing time t and the mold closing position X at the time of normal mold closing, position detection by the position sensor becomes unnecessary, and Since the mold closing time t can be reflected in the mold closing position X, more diverse display can be performed.

  Through such processing, graph data Dfd, Dfc, and Dfs related to the mold closing force F are displayed on the graph display unit 61 shown in FIGS. 2 and 3B. The display of the graph data Dfd, Dfc, Dfs on the graph display unit 61 is continued unless the selection of the mold opening / closing screen switching key K1 is released (step S8). On the other hand, the user can return the “mold closing force” display mode to the standard “torque” display mode (step S9). In this case, the display switching key 63 is operated to switch the “mold closing force” display mode to the “torque” display mode (step S10). Thereby, the graph data Dtd... Related to the torque T is switched and displayed on the graph display unit 61 (step S3...).

  FIGS. 2 and 3B show a mode in which the graph data Dfd, Dfc, and Dfs related to the mold closing force F are displayed. As shown in FIG. 4, the graph data excluding the graph data Dfc is shown. Dfd and Dfs may be displayed. Thereby, since the range in the Y-axis direction can be reduced, the degree of change can be displayed with more emphasis. Therefore, such a display mode is not limited to an example, and various modes can be applied.

  Therefore, according to such a data display method according to the present embodiment, the graph data Dtd, Dtc, Dts related to the torque T are converted into the graph data Dfd, Dfc, Dfs related to the mold closing force F in the mold C, In addition, the mold closing position X of the mold C at the time of detecting the torque T is obtained, and the graph data Dfd, Dfc, and Dfs related to the mold closing force F with respect to the mold closing position X are converted into the graph data Dtd, Dtc, Dts related to the torque T. Or in addition to the display of graph data Dtd, Dtc, and Dts related to torque T, the display 4 displays the actual data in the mold C even in the toggle link type mold clamping device Mc. The mold closing force F can be easily and accurately grasped. Therefore, it is possible to contribute to improvement in work efficiency by facilitating and speeding up various setting operations, and it is possible to realize more reliable mold protection. In particular, even when the direct pressure type clamping device is changed to the toggle link type clamping device, the user can easily and accurately set the torque limit value, threshold value, monitoring condition, etc. when monitoring the presence or absence of foreign matter. 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, the exemplary arithmetic expression can be replaced with another arithmetic expression as necessary, and is not limited to the exemplary arithmetic expression. In addition, this arithmetic expression includes a case where conversion is performed using a database (data table). Therefore, the database 5 mentioned in the embodiment also includes a case where it is obtained by an arithmetic expression instead of this database. On the other hand, although the servo motor 2 is illustrated, other types of motors are not excluded. Furthermore, in the embodiment, the graph data Dfd... Related to the mold closing force F with respect to the mold closing position X is illustrated instead of the graph data Dtd. May be displayed in addition to. In this case, in addition to display includes a mode in which the graph is displayed superimposed on one graph display unit 61 and a mode in which the two graph display units 61 are displayed in two stages. Further, as graph data Dtd, Dtc, and Dts related to the torque T, graph data Dtd related to the actually measured torque value Td and graph data Dtc and Dts related to the torque limit values Tsc and Tss are listed. May be included. Thereby, the magnitude | size of the mold closing force F which generate | occur | produces actually and the magnitude | size of the mold closing force F corresponding to a torque command value can be grasped | ascertained simultaneously. The data display method according to the present invention can be used in the same manner for the injection molding machine M as well as other various molding machines (extrusion molding machine, etc.) equipped with a toggle link type clamping device.

The flowchart which shows the process sequence of the data display method which concerns on the best embodiment of this invention, Screen display diagram showing the mold opening and closing screen used for the data display method, A screen display diagram for explaining a graph display section in a mold opening / closing screen used in the data display method; Screen display diagram of another graph display unit used for the data display method, Overview of injection molding machine that implements the same data display method, Configuration diagram of a mold clamping device in an injection molding machine that implements the data display method, Block diagram of a servo circuit in an injection molding machine that implements the data display method,

Explanation of symbols

  2: motor, 3: toggle link mechanism, 4: display, 5: database, C: mold, Mc: clamping device, Dtd: graph data, Dtc: graph data, Dts: graph data, Dfd: graph data, Dfc : Graph data, Dfs: Graph data

Claims (2)

  During operation of a mold clamping device that opens / closes and molds the mold via a toggle link mechanism driven by a motor, the torque of the motor is detected at a predetermined sampling interval, and at least graph data relating to the detected torque is displayed. In the data display method of the molding machine displayed in the above, at least the graph data related to the torque, in addition to the graph data related to the actually measured torque value, at least the fixed torque limit value set manually and / or the predetermined condition Including at least one of graph data related to a torque limit value that is automatically set and fluctuating, and graph data related to a torque command value, the graph data related to the torque is related to the mold closing force of the mold. The data is converted into data, and the mold closing position of the mold when the torque is detected is set in advance. The relationship between the mold closing time and the mold closing position at the time of normal mold closing is obtained from a registered database, and the graph data related to the mold closing force with respect to the mold closing position is displayed in the graph data related to the torque. Instead, or in addition to displaying graph data relating to the torque, the data is displayed on the display.   2. The data display method for a molding machine according to claim 1, wherein the conversion from the graph data relating to the torque to the graph data relating to the mold closing force of the mold uses a predetermined arithmetic expression set in advance.

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