JP4157489B2 - Screen display method of molding machine controller - Google Patents

Description

  The present invention relates to a screen display method for a molding machine controller that displays one or more monitor display sections on a display screen of a display attached to the molding machine controller.

  In general, a toggle type clamping device for clamping a mold provided in an injection molding machine is known from Japanese Patent Publication No. 6-61806. As disclosed in the same publication, the toggle type mold clamping device uses a toggle link mechanism to connect a movable plate that supports a movable mold and a crosshead that is advanced and retracted by a drive unit to increase the pressure applied to the crosshead. It has a function of transmitting to the movable platen, and a predetermined clamping force is generated based on the extension of the tie bar when the toggle link mechanism is almost extended. In the mold clamping operation, as shown in FIG. 9, normally, the high speed mold closing is performed from the mold opening position Xa, and when the low speed / low pressure switching position Xb set in advance is reached, the process shifts to the low speed / low pressure mold closing. This low-speed and low-pressure mold closing becomes a mold protection section, and a molded product or the like that has not been normally discharged is detected as a foreign object. When the preset high pressure switching position Xc is reached, the process shifts to high pressure mold clamping, and high pressure mold clamping is performed. In FIG. 9, Xd indicates a mold clamping end position. The change in the load torque T in the mold clamping operation is as shown in FIG.

  By the way, the toggle type mold clamping device is different from the direct pressure type mold clamping device because of its mold clamping principle, even when the mold and tie bar are slightly expanded and contracted due to disturbance factors such as the heating temperature of the mold and the outside temperature. The mold clamping force may fluctuate greatly, resulting in not only a deterioration in quality when molding a precision molded product, but also a serious problem such as erroneous detection or inability to detect in the mold protection section. For this reason, if there is a change in the standard mold clamping force (mold closing position) as a reference, it is necessary to deal with it promptly by correction, resetting, etc., and the mold closing position in the toggle mold clamping device It is important to accurately monitor the end position of the mold protection section corresponding to the mold closing position.

Conventionally, as a method for monitoring various physical quantities related to the operation of the toggle type mold clamping device, a monitor display method disclosed in Japanese Patent Laid-Open No. 9-327849 is known. In this monitor display method, when displaying waveforms on the monitor connected to the controller, each waveform of injection pressure, mold clamping force and movable platen position in the injection compression process is displayed graphically based on the time axis reference at the same time. The toggle type injection compression molding machine is monitored.
JP 6-61806 JP-A-9-327849

  However, the conventional monitor display method (screen display method) described above has the following problems.

  First, since each waveform related to mold clamping force and movable platen position is displayed with time on the horizontal axis, information related to the position important for monitoring the toggle type mold clamping device, specifically, mold clamping It becomes difficult to display information such as the mold closing position that influences the force and the end position of the mold protection section set corresponding to this mold closing position corresponding to each waveform, It is not possible to know important information related to it easily and accurately.

  Secondly, the graphic display is displayed with only a simple waveform with the horizontal axis as time, and other display elements are not taken into consideration, so that the mold protection section which is an important setting item for the toggle type mold clamping device is displayed. The end position or the like cannot be set easily and accurately.

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

  In order to solve the above-described problem, the screen display method of the molding machine controller according to the present invention displays one or more monitor display units on the display screen 3v of the display 3 attached to the molding machine controller 2. At least in part of the display screen 3v, the horizontal axis indicates the position of the cross head 4 in the toggle mold clamping device Mc, and the vertical axis indicates the load torque T associated with the closing of the mold 5 and the cross associated with the closing of the mold 5. The velocity V of the head 4, the acceleration A of the cross head 4 accompanying the closing of the mold 5, the estimated torque E generated by the disturbance accompanying the closing of the mold 5, the positional deviation Xr of the cross head 4 accompanying the closing of the mold 5; In addition to providing a graphic display unit 61 that graphically displays a physical quantity variation curve W with respect to the position of the crosshead 4 by calibrating the physical quantities relating to the single or combination of One or two or more numerical value display parts 62, 63, 64, 65 which display numerically one or two or more set values (reference values) and / or detection values related to the position of the head 4 and which have different colors. In addition, the graphic display unit 61 corresponds to the set value (reference value) and / or the detected value, and the color is matched with the color arrangement of each numerical value display unit 62, 63, 64, 65. A cursor 62c, 63c, 64c, 65c is displayed.

  In this case, according to a preferred aspect of the invention, each numerical display 62, 63, 64, 65 has a first display 62h, 63h, 64h, 65h for displaying the position of the crosshead 4, and the position of the crosshead 4. Can be provided with second display parts 62x, 63x, 64x, 65x for converting and displaying the position of the movable platen 7 in the toggle type mold clamping device Mc. The set value (reference value) and / or the detected value includes at least a mold protection end position Xe that is a set value, a mold closing position Cs that is a detected value Dd, and a mold closed position reference that is a reference value Ds. , One or more end positions Xf related to the mold closing monitor as the set value can be included.

  According to the screen display method of the molding machine controller according to the present invention by such a method, the following remarkable effects can be obtained.

  (1) Since the graphic display unit 61 for graphically displaying the fluctuation curve W of the physical quantity with respect to the position of the crosshead 4 in the toggle type mold clamping device Mc is provided, information relating to the position important for monitoring the toggle type mold clamping device Mc, The information such as the mold closing position Cs that influences the mold clamping force Fm and the end positions Xe and Xf of the mold protection sections Zd1 and Zd2 set corresponding to the mold closing position Cs is associated with the fluctuation curve W. It is possible to display the information, and important information related to the toggle type mold clamping device Mc can be easily and accurately known.

  (2) Since the graphic display unit 61 displays one or more cursors 62c corresponding to the set value (reference value) and / or the detected value, the operator can easily and reliably position corresponding to each item. Therefore, more accurate monitoring can be realized for the toggle type mold clamping device Mc.

  (3) The display screen 3v is provided with one or two or more numerical value display units 62 for displaying numerically one or two or more set values (reference values) and / or detection values related to the position of the crosshead 4. In this manner, the numerical display units 62... Display the position of the crosshead 4 on the first display unit 62 h... And the position of the crosshead 4 is converted into the position of the movable platen 7 in the toggle type mold clamping device Mc. By providing the second display section 62x to be displayed, it is possible to know detailed numerical information together with image information by the graphic display section 61, and to easily and accurately acquire important information in the toggle type mold clamping device Mc. You can know and perform optimal monitoring.

  (4) One or two or more setting values (reference values) and / or detection values related to the position of the crosshead 4 are displayed numerically, and one or two or more numerical display units 62, 63, which are provided with different colors, respectively. 64 or 65, and the graphic display unit 61 corresponds to the set value (reference value) and / or the detected value, and the color is matched with the color arrangement of each numerical value display unit 62, 63, 64, 65 or Since two or more cursors 62c, 63c, 64c, 65c are displayed, it is possible to accurately and easily set the end positions Xe, Xf, etc. of the mold protection section, which are important setting items for the toggle type mold clamping device Mc. Can do.

  (5) According to a preferred embodiment, the set value (reference value) and / or the detected value are at least the mold protection end position Xe that becomes the set value, the mold closing position Cs that becomes the detected value Dd, and the reference value Ds. By including one or more end positions Xf related to the mold closing position reference and the mold closing monitor as a set value, various information relating to the position important for monitoring the toggle type mold clamping device Mc can be obtained. Or it can grasp | ascertain easily and exactly by correlating.

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

  First, a configuration of a toggle type mold clamping device Mc suitable for use in implementing the screen display method according to the present embodiment will be described with reference to FIGS.

  FIG. 2 shows an injection molding machine M, which includes a toggle type mold clamping device Mc and an injection device Mi. The toggle type mold clamping device Mc includes a fixed platen 11 and a pressure receiving plate 12 that are spaced apart from each other. The fixed platen 11 is fixed on a machine base (not shown), and the pressure receiving plate 12 moves forward and backward on the machine base. Supported as possible. Further, four tie bars 13 are laid between the fixed platen 11 and the pressure platen 12. In this case, the front ends of the tie bars 13 are fixed to the stationary platen 11, and the rear ends of the tie bars 13 are inserted into the pressure receiving plate 12 and threaded portions 14 formed on the rear end side. The adjustment nuts 15 that also serve as stoppers for the pressure receiving plate 12 are screwed together.

  Each adjustment nut 15 constitutes a mold thickness adjusting mechanism 16 that adjusts the position of the pressure receiving platen 12. The mold thickness adjusting mechanism 16 further includes small gears 17 provided coaxially with the adjustment nuts 15, a large gear 18 meshing with the small gears 17, and meshing with the large gear 18. And a mold thickness adjusting motor 20 provided with the drive gear 19 on a rotating shaft, and a rotary encoder 21 for detecting the rotational speed of the mold thickness adjusting motor 20.

  In this case, the small gears 17 are arranged at the four corners of the square, and the large gears 18 are arranged at positions surrounded by the small gears 17. Mesh. Accordingly, when the mold thickness adjusting motor 20 is operated, the rotation of the drive gear 19 is transmitted to the large gear 18, and the small gears 17 are rotated simultaneously, and the adjusting nuts 15 that rotate integrally are Since the advancing and retreating movement along the screw portions 14 of the tie bars 13...

  On the other hand, the movable platen 7 is slidably loaded on the tie bars 13. The movable platen 7 supports the movable die 5m, the fixed platen 11 supports the fixed die 5c, and the movable die 5m and the fixed die 5c constitute the mold 5. A toggle link mechanism L is disposed between the pressure receiving plate 12 and the movable platen 7. The toggle link mechanism L includes a pair of first links La and La that are pivotally supported on the pressure receiving plate 12, a pair of output links Lc and Lc that are pivotally supported on the movable platen 7, a first link La and La, and an output link Lc, A pair of second links Lb and Lb coupled to the support shaft of Lc are provided, and the second links Lb and Lb are supported on the cross head 4.

  Further, a mold clamping drive unit 22 is disposed between the pressure receiving plate 12 and the crosshead 4. The mold clamping drive unit 22 includes a ball screw portion 23 s rotatably supported by the pressure receiving plate 12, and a ball nut portion 23 n that is screwed into the ball screw portion 23 s and provided integrally with the cross head 4. In addition to the ball screw mechanism 23, a rotation drive mechanism unit 24 that rotationally drives the ball screw unit 23s is provided. The rotation drive mechanism 24 includes a mold clamping servomotor 25, a rotary encoder 26 attached to the servomotor 25 for detecting the rotation speed of the servomotor 25, and a drive gear 27 attached to the shaft of the servomotor 25. A driven gear 28 attached to the ball screw portion 23 s and a timing belt 29 spanned between the drive gear 27 and the driven gear 28 are provided.

  Accordingly, when the servo motor 25 is operated, the drive gear 27 is rotated, and the rotation of the drive gear 27 is transmitted to the driven gear 28 via the timing belt 29, and the ball screw portion 23s is rotated to thereby rotate the ball nut. Part 23n moves forward and backward. As a result, the cross head 4 integrated with the ball nut portion 23n moves forward and backward, the toggle link mechanism L shortens or expands, and the movable platen 7 advances and retracts in the mold opening direction (retracting direction) or the mold closing direction (advancing direction). Moving. A molding machine controller 2 connects the mold clamping servomotor 25, the rotary encoder 26, the mold thickness adjusting motor 20, and the rotary encoder 21. Further, a display 3 provided with a touch panel is connected to the molding machine controller 2. The display 3 is usually attached to a side panel or the like of the injection molding machine M.

  On the other hand, FIG. 3 shows a servo circuit 31 which is a part of the molding machine controller 2. The servo circuit 31 includes deviation calculation units 32 and 33, adders 34 and 35, a position loop gain setting unit 36, a feed forward gain setting unit 37, a speed limiter 38, a speed converter (differentiator) 39, and a speed loop gain setting unit. 40, a torque limiter 41, a driver 42, a disturbance monitoring unit 43, and an acceleration converter (differentiator) 44, and a servo control system (servo circuit 31) is constituted by the system shown in FIG. The above-described mold clamping servomotor 25 is connected to the output side of the driver 42, and the rotary encoder 26 attached to the servomotor 25 is connected to the speed converter 39 and the inverting input section of the deviation calculating section 32, respectively. Connecting. Further, the non-inverting input unit of the deviation calculation unit 32 is connected to a sequence controller (not shown).

  Further, in the figure, Pt is a signal capturing terminal used for detecting the load torque T accompanying the closing of the mold 5, and Pv is a signal capturing terminal used for detecting the speed V of the movable platen 7 when the mold 5 is closed. , Pa is a signal capturing terminal used for detecting the acceleration A of the movable platen 7 when the mold 5 is closed, Pe is a signal capturing terminal used for detecting the estimated torque E generated by disturbance due to the closing of the mold 5, Px indicates a signal capturing terminal used for detecting the positional deviation Xr of the movable platen 7 when the mold 5 is closed. In addition, operation | movement (function) of each part is demonstrated by the whole operation | movement of toggle type mold clamping apparatus Mc mentioned later.

  FIG. 1 shows a display screen 3v of the display 3 connected to the molding machine controller 2, and the screen display method according to the present embodiment is implemented by the display screen 3v. Various settings and the like can be performed by a touch panel attached to the display screen 3v. A display screen 3v shown in FIG. 1 is a mold opening / closing setting screen, and includes a graphic display unit 61 serving as a monitor display unit that graphically displays a variation curve W of the load torque T, and further includes a monitor display unit. Numerical value display section 62 related to the mold protection end position, numerical display section 63 related to the mold closing position, numerical display section 64 related to the mold closing position reference, and numerical display section 65 related to the end position of the mold closing monitor Each is equipped.

  In this case, in the graphic display unit 61, the horizontal axis (X axis) is the position [mm] of the crosshead 4 and the vertical axis (Y axis) is the load torque T [%]. The load torque T [%] is displayed with the maximum torque being 100 [%]. As a result, the magnitude of the load torque T corresponding to the position [mm] of the crosshead 4 is graphically displayed on the graphic display unit 61 as the fluctuation curve W. Further, the graphic display unit 61 includes a cursor 62c (pink) indicating the end position Xe of the mold protection section Zd1, a cursor 63c (red) indicating the detection value Dd of the mold closing position Cs, and a reference for the mold closing position Cs. The cursor 64c (blue) indicating the value Ds and the cursor 65c (green) indicating the end position Xf of the mold closing monitor section serving as the second mold protection section Zd2 are color-coded, and the color types are clearly defined at the upper and lower ends. Displayed by a vertical line with a triangular arrow mark to indicate. By displaying the color-coded cursors 62c, 63c, 64c and 65c corresponding to each item, the operator can easily and surely know the position corresponding to each item, and the toggle type mold clamping device Mc More accurate monitoring can be realized.

  On the other hand, the numerical value display unit 62 displays the numerical value of the end position Xe (see FIG. 4) of the mold protection zone Zd1 according to the position of the crosshead 4 and the position of the crosshead 4 on the movable platen 7. The numerical display unit 63 includes a first display unit 63 h that displays the numerical value of the detected value Dd of the mold closing position Cs according to the position of the crosshead 4. A second display portion 63x that converts the position of the crosshead 4 into the position of the movable platen 7 and displays numerical values is provided. The numerical display unit 64 converts the reference value Ds of the mold closing position Cs into a numerical value based on the position of the crosshead 4 and converts the position of the crosshead 4 into the position of the movable platen 7. The numerical display unit 65 includes a second display unit 64x for displaying numerical values, and a numerical display unit 65 for displaying numerically the end position Xf of the mold closing monitor section serving as the second mold protection section Zd2 according to the position of the crosshead 4. And an ON key 65s for setting the end position Xf. By providing such numerical display units 62 (first display unit 62h, second display unit 62x, etc.), detailed numerical information can be known together with image information by the graphic display unit 61, and toggle type. Important information in the mold clamping device Mc can be easily and accurately known, and optimal monitoring can be performed.

  Further, the upper positions of the numerical display units 62, 63, 64 and 65 are respectively “mold protection end position”, “mold closing position”, “mold closing position reference” and “mold closing monitor”. In addition to displaying items, color-coded color frame portions 62k (pink), 63k (red), 64k (blue), and 65k (green) are displayed around each item. The colors of the color frame portions 62k (pink), 63k (red), 64k (blue) and 65k (green) are the same as those of the cursors 62c (pink), 63c (red), 64c (blue) and 65c (green). It corresponds to the color. Thereby, the operator can easily know which item each cursor 62c, 63c, 64c and 65c corresponds to. The position of the crosshead 4 can be easily converted to the position of the movable platen 7 by using a known conversion formula. FIG. 5 shows a display mode when the range of the scale of the horizontal axis (X axis) and the vertical axis (Y axis) in the graphic display unit 61 is changed. In this way, a different color scheme is applied to each numerical value display unit 62... And the color of the cursor 62 c corresponding to each numerical value display unit 62... Matches the color scheme of each numerical value display unit 62. The end positions Xe, Xf, etc. of the mold protection section, which are important setting items for the fastening device Mc, can be set accurately and easily.

  Next, the operation (function) of the toggle type mold clamping device Mc including the screen display method according to the present embodiment will be described with reference to FIGS.

  First, the molding machine controller 2 has a closed position detection mode for detecting the mold closed position Cs. The mold closing position Cs is a position where the movable mold 5m and the fixed mold 5c touch. In the closed position detection mode, the movement amount (displacement amount) of the crosshead 4 accompanying the closing of the mold 5 and the variation amount of the physical quantity accompanying the closing of the mold 5 are sequentially detected, and the fixed movement amount ΔX of the crosshead 4 is detected. By sequentially obtaining the fluctuation rate ΔT of the physical quantity, it has a function of detecting the position when the fluctuation rate ΔT reaches a preset setting rate Ts as the mold closing position Cs.

  In this case, the fluctuation rate ΔT may be a fluctuation amount. That is, the fluctuation rate ΔT may be obtained as a fluctuation amount ΔT corresponding to the constant movement amount ΔX, or may be a fluctuation rate obtained from ΔT / ΔX. Moreover, the load torque T is used as a physical quantity. A signal related to the load torque T is obtained from the signal take-in terminal Pt described above, and a signal obtained from the signal take-in terminal Pt is given to the molding machine controller 2. Further, the amount of movement of the crosshead 4 is detected using an encoder pulse of a rotary encoder 26 that detects the number of rotations of the servo motor 25.

  On the other hand, a setting rate Ts is set in the molding machine controller 2. As shown in FIG. 5, this set rate Ts is obtained when the variation rate (increase rate) ΔT of the load torque T with respect to the constant movement amount ΔX of the crosshead 4 accompanying the closing of the mold 5 reaches the set rate Ts. Is used as a mold closing position Cs. Therefore, the magnitude of the setting rate Ts can be set as appropriate through experiments and adjustments. For example, since the load torque T is displayed as a percentage with the maximum torque being 100 [%], the constant movement amount ΔX of the crosshead 4 is set to several millimeters, and the rate of increase (increase amount) ΔT of the load torque T at this time Is obtained, the set rate Ts for the rate of increase ΔT can be set to around 1%.

  Next, a specific processing procedure will be described. First, the mold closing position Cs is detected in the closing position detection mode. The processing procedure in the closed position detection mode will be described with reference to the flowchart shown in FIG.

  Now, it is assumed that the mold 5 is in the mold open position (fully open position). Therefore, the crosshead 4 in the toggle link mechanism L is in the mold opening position Xa shown in FIG. When the mold clamping operation is started, the mold clamping servomotor 25 is operated, the cross head 4 is moved forward, and the movable platen 7 is moved forward from the mold opening position in the mold closing direction. At this time, first, high-speed mold closing in which the movable platen 7 moves forward at high speed is performed.

  In this case, the servo circuit 31 performs speed control and position control for the movable platen 7 (crosshead 4). That is, a position command value is given from the sequence controller to the deviation calculation unit 32 of the servo circuit 31 and compared with a position detection value obtained based on the encoder pulse of the rotary encoder 26. Thereby, since the position deviation Xr is obtained from the deviation calculating section 32, position feedback control is performed based on the position deviation Xr.

  The position deviation Xr is compensated by the position loop gain setting unit 36 and applied to the input unit of the adder 34, and the position command value is compensated by the feedforward gain setting unit 37 and input to the adder 34. To be granted. Then, the output of the adder 34 is given to the non-inverting input unit of the deviation calculating unit 33 via the speed limiter 38. On the other hand, the position detection value is differentiated by the speed conversion unit 39 and converted into a speed (speed detection value) V, and the speed V is given to the inverting input unit of the deviation calculation unit 33. As a result, a speed deviation is obtained from the deviation calculator 33, and speed feedback control is performed based on this speed deviation. In this case, the speed V is limited by the speed limiter 38.

  Further, the speed deviation is compensated by the speed loop gain setting unit 40 and is given to the input unit of the adder 35. On the other hand, the velocity V is differentiated by the acceleration conversion unit 44 and converted into acceleration (acceleration detection value) A, and this acceleration A is given to the input unit of the disturbance monitoring unit 43. The disturbance monitoring unit 43 monitors the acceleration A and, for example, outputs an estimated torque (torque value) E that speeds recovery when the acceleration A abnormally changes due to some cause (disturbance). The estimated torque E is given as a correction value to the input unit of the adder 35. As a result, a torque command (command value) is obtained from the adder 35, and this torque command is given to the driver 42 via the torque limiter 41. Thereby, the servo motor 25 is driven and controlled, and position control and speed control are performed on the movable platen 7 (cross head 4). The torque command output from the torque limiter 41 is fed back to the input unit of the disturbance monitoring unit 43.

  On the other hand, when the movable platen 7 moves forward in the mold closing direction and the crosshead 4 reaches a preset low-speed / low-pressure switching point Xb, the process shifts to low-speed / low-pressure mold closing (step S1). In this low-speed and low-pressure mold closing, as shown in FIG. 4, a mold protection process such as foreign object detection is performed in the mold protection zone Zd1 set in the previous stage. That is, in the mold protection section Zd1, the magnitude of the load torque T is monitored, and if a preset threshold value is exceeded, it is determined that there is a foreign object and abnormal processing such as mold opening control is performed.

  As shown in FIGS. 1 and 5, the end position Xe of the mold protection section Zd1 is set in advance by a numerical value display unit 62 that also functions as a setting function. Since this end position Xe is set in a preliminary manner before detecting the normal mold closing position Cs (reference value Ds), it is set with some margin before the assumed mold closing position. can do. In setting, a numerical value is set in the first display portion 62h according to the position of the crosshead 4. In this case, for example, a known setting method of inputting numerical values by touching the first display unit 62h and displaying a numeric keypad window can be used. When the end position Xe is set, the cursor 62c corresponding to the set end position Xe is displayed on the graphic display unit 61. Since the color (pink) of the cursor 62c matches the color (pink) of the color frame portion 62k displayed on the numerical value display portion 62 as described above, the operator uses the cursor 62c to determine the end position Xe. Can be easily and accurately known, and the end position Xe corresponding to the mold protection section Zd1 can be easily and reliably known.

  When the mold protection section Zd1 is completed, the mold closing position Cs for the mold 5 is detected. That is, an increase rate monitoring process for monitoring the magnitude of the increase rate ΔT for detecting the mold closing position Cs is performed (step SP). In FIG. 4, Zd2 indicates a second mold protection section that is a mold closing monitor section, but is not yet set at this point. In the increase rate monitoring process, first, the molding machine controller 2 detects the position of the crosshead 4 (step S2). The position of the crosshead 4 is detected by using an encoder pulse of a rotary encoder 26 that detects the number of rotations of the mold clamping servomotor 25. In this case, the rotary encoder 26 is an incremental encoder and detects the absolute position based on the number of encoder pulses generated with respect to the reference position. By using such a rotary encoder 26, a separate position detecting means for detecting the position of the crosshead 4 is not required. As described above, by using the displacement amount (movement amount) of the crosshead 4 having a large movement amount relative to the movement amount of the movable platen 7, it is possible to detect the mold closing position Cs with high accuracy. it can. As a result, the amount of fluctuation of the mold clamping force Fm, which will be described later, can be detected accurately, so that the mold clamping force Fm can be accurately corrected.

  Further, the molding machine controller 2 sequentially takes in the load torque T, for example, at a sampling period of every 500 [μsec], and obtains a moving average of N times by averaging processing (steps S3 and S4). As a result, the obtained load torque T is graphically displayed as a variation curve W on the graphic display unit 61 as shown in FIGS. 1 and 5 corresponding to the detected position of the crosshead 4.

  Further, by obtaining the displacement amount (movement amount) of the crosshead 4 and the fluctuation amount of the load torque T, an increase amount (increase rate) ΔT of the load torque T with respect to the constant movement amount ΔX of the crosshead 4 is obtained (step S5). ). In this case, for example, when the constant movement amount ΔX of the crosshead 4 is set to several millimeters, a corresponding increase amount (increase rate) ΔT [%] of the load torque T is obtained. Then, it is monitored whether or not the rate of increase ΔT has reached a preset set rate Ts. If the rate of increase ΔT has reached the set rate Ts, the position of the crosshead 4 at that time is determined as the mold closing position Cs. (Steps S6 and S7). The taken-in mold closing position Cs is set as a reference value Ds (step S8).

  On the other hand, the reference value Ds is displayed by the cursor 64c on the graphic display unit 61 on the display screen 3v. Since the color (blue) of the cursor 64c matches the color (blue) of the color frame portion 64k displayed on the numerical value display portion 64 as described above, the operator uses the cursor 64c to measure the reference value Ds. As well as the reference value Ds of the mold closing position Cs can be easily and reliably known. The reference value Ds is numerically displayed on the first display portion 64h, converted to the position of the movable platen 7, and displayed on the second display portion 64x. The above description is a basic mode of the closed position detection mode, and the actual reference value Ds (and the detected value Dd) is obtained by executing the closed position detection mode a plurality of times and obtaining a plurality of closed positions obtained as described later. It can be obtained from the average.

  Furthermore, when the reference value Ds is set, the operator displays a numerical value that also serves as a setting function for the end position Xf of the mold closing monitor that becomes the second mold protection zone Zd2 with reference to the reference value Ds. Manual setting is performed using the unit 65 (step S9). That is, the operator displays the end position Xf of the second mold protection zone Zd2 with reference to the cursor 64c related to the reference value Ds displayed on the graphic display unit 61 and the numerical display of the first display unit 64h. A numerical value is set in the portion 65h. In this case, the end position Xf is set according to the position of the crosshead 4. The end position Xf is set in consideration of the thickness of the molded product. For example, when the thickness of the molded product is 0.1 [mm], the end position Xf can be set between the mold closing position Cs and the front 0.1 [mm]. In the present embodiment, since the end position Xf is set by the position of the crosshead 4 having a relatively large displacement amount with respect to the movement amount of the movable platen 7, a thin sheet shape having a thickness of about 0.1 [mm]. The end position Xf can be set easily and with high accuracy even in the case of the molded product.

  When the end position Xf is set on the display unit 65h, the end position Xf of the mold closing monitor section serving as the second mold protection section Zd2 is moved to the graphic display section 61 by touching the ON key 65s. It is displayed by 65c. Since the color (green) of the cursor 65c matches the color (green) of the color frame portion 65k displayed on the mold closing monitor setting unit 65 as described above, the operator uses the cursor 65c to move the end position. The degree of Xf can be easily and accurately known, and the end position Xf of the mold closing monitor section serving as the second mold protection section Zd2 can be easily and reliably known.

  Next, the operation during production operation will be described according to the flowchart shown in FIG. 7 (FIG. 8).

  Assume that the production operation is performed by automatic molding (step S11). In this case, the reference value Ds described above is set in advance. During production operation, when the preset closed position detection time or the number of closed position detection shots is reached, the closed position detection mode is automatically executed (steps S12 and S13). The execution interval of the closed position detection mode may be performed every time a shot is performed, or may be performed every fixed shot (or a fixed time), and is set in consideration of the variation degree of the mold clamping force Fm in the actual machine. Can do.

  The processing procedure in the closed position detection mode during production operation will be described with reference to the flowchart shown in FIG. Now, it is assumed that the mold 5 is in the mold open position (fully open position). Therefore, the crosshead 4 in the toggle link mechanism L is in the mold opening position Xa shown in FIG. When the mold clamping operation is started, the mold clamping servo motor 25 is operated, and the movable platen 7 moves forward from the mold opening position to the mold closing direction. At this time, the movable platen 7 is first fast-closed to move forward at high speed (step S21). When the movable platen 7 moves forward in the mold closing direction and the crosshead 4 reaches a preset low speed / low pressure switching point Xb, the process shifts to low speed / low pressure mold closing (step S22). In this low-speed and low-pressure mold closing, as shown in FIG. 4, first, a detection process for an abnormality such as a foreign object is performed in the mold protection zone Zd1.

  Further, when the mold protection section Zd1 is completed, the monitoring process for the presence or absence of pinching particularly focusing on the molded product is performed by the mold closing monitor section which becomes the second mold protection section Zd2 (steps S23 and S24). , S25). As described above, for example, when the thickness of the molded product is 0.1 [mm], the mold closing monitor section has an end position Xf between the mold closing position Cs and the front 0.1 [mm]. Therefore, it is possible to detect a thin sheet-shaped molded product remaining in the mold 5 without being discharged when the mold is opened, and in fact, a sheet-shaped molded product having a thickness of about 0.09 [mm]. Even so, it can be reliably detected.

  On the other hand, if the mold closing monitor section is completed, the mold closing position Cs for the mold 5 is detected by the closing position detection section Zc (step S25, SP). This detection process is the same as step SP in the flowchart shown in FIG. 6 in the case where the above-described reference value Ds is set. If the increase rate ΔT obtained by the detection process for the mold closing position Cs in the closing position detection zone Zc reaches a preset set rate Ts, the process shifts to high pressure clamping and performs high pressure clamping (step S26). At the same time, the position of the crosshead 4 when the increase rate Ts reaches the set rate Ts is detected, and this position is taken in as the detection value Dd of the mold closing position Cs (steps S27 and S28). As described above, by setting the mold protection sections Zd1 and Zd2 and the closing position detection section Zc, the mold closing position Cs is detected after the mold protection sections Zd1 and Zd2 are completed. It is possible to stably and reliably perform both the protection process for the mold 5 and the detection process of the mold closing position Cs without causing interference.

  The detected detection value Dd is numerically displayed on the first display portion 63h and the second display portion 63x of the numerical value display portion 63 on the display screen 3v, and is displayed on the graphic display portion 61 by the cursor 63c. Therefore, the numerical values of the display units 63h and 63x and the position of the cursor 63c are changed every time the detection value Dd is detected. Since the color (red) of the cursor 63c matches the color (red) of the color frame portion 63k displayed on the numerical value display portion 63 as described above, the operator uses the cursor 63c to determine the extent of the detected value Dd. Can be easily and accurately known, and the detected value Dd of the mold closing position Cs can be easily and reliably known.

  Further, the closed position detection mode is executed a plurality of times set in advance, and the detection value Dd is obtained from the average of the plurality of mold closing positions Cs... Obtained (steps S13, S14, S15). As a result, a highly reliable detection value Dd from which noise components have been removed is obtained. When the detection value Dd is obtained, a deviation Ke from the preset reference value Ds, that is, Ke = Ds−Dd is obtained (step S16). If the deviation Ke is obtained, based on this deviation Ke, the correction for the end position Xe of the set mold protection section Zd1 and the end position Xf of the mold closing monitor section that becomes the second mold protection section Zd2 I do. Correction for the end positions Xe and Xf is performed as follows. Load torques Tf and Tr indicated by phantom lines in FIG. 4 indicate cases where the mold clamping force Fm varies. The load torque Tr is a fluctuation curve when the mold 5 is heated and thermally expanded, and is detected as the mold closing position Cr before the normal mold closing position Cs. In this case, the mold clamping force Fm increases. Therefore, if the mold opening position is the starting point (0) of the distance, the end position Xf (Xe) is corrected to be decreased by the deviation Ke. That is, in FIG. 4, Zc indicates the above-described closing position detection section between the end position Xf (Xe) and the mold closing position Cs, but when the mold closing position Cs is displaced, this closing position detection section Zc. The end position Xf (Xe) is corrected so that the distance is always constant.

  In particular, the load torque Tr shown in FIG. 4 is a fluctuation curve when the mold 5 is further heated, and the movable mold 5m starts to contact the fixed mold 5c before the end position Xf (Xe). Show. In this case, unless the end position Xf (Xe) is corrected, it is difficult to determine whether the fluctuation of the load torque Tr is due to the contact between the movable mold 5m and the fixed mold 5c based on normal operation or due to the detection of a foreign object or the like. As a result, erroneous detection occurs. However, by correcting the end position Xf (Xe), it is possible to stably and reliably perform both the detection process of foreign matter and the detection process of the mold closing position Cs according to the present embodiment without interfering with each other. .

  Similarly, the load torque Tf is a variation curve when the tie bars 13 are heated and thermally expanded, and is detected as the mold closing position Cf at a position past the normal mold closing position Cs. In this case, the mold clamping force Fm is reduced. Therefore, the end position Xf (Xe) is corrected to increase by the deviation Ke. In FIG. 4, Xd indicates a mold clamping end position. Even the mold closing positions Cs, Cf, Cr related to the fluctuation of the mold clamping force Fm can be accurately detected by the above-described closing position detection mode.

  On the other hand, since the allowable range Re for the deviation Ke is preset in the molding machine controller 2, the allowable range Re is compared with the obtained deviation Ke to determine whether the deviation Ke exceeds the allowable range Re. judge. As a result, when the deviation Ke is within the allowable range Re, the mold clamping force Fm is not corrected. Therefore, the production operation is continued as it is (steps S17 and S11).

  On the other hand, when the deviation Ke exceeds the allowable range Re, the detection value Dd is detected again (steps S17, S18, S11). That is, in the illustrated example, the detection value Dd is continuously detected a plurality of times, and if the obtained deviation Ke continuously exceeds the allowable range Re, the mold clamping force Fm is corrected (steps S19 and S20). For example, when the detected value Dd is detected twice in succession and the obtained deviation Ke... Exceeds the allowable range Re twice, the mold clamping force Fm is corrected. Therefore, when the allowable range Re is exceeded only once, it is determined that the cause is a temporary factor due to disturbance or the like, and correction is not performed. Thereby, stability and reliability when performing correction can be enhanced.

  On the other hand, the correction processing procedure for the mold clamping force Fm is as follows. The illustration shows an example in which the correction is performed when the deviation Ke exceeds the allowable range Re continuously a plurality of times, and thus a plurality of deviations Ke are obtained. Therefore, in this example, a plurality of deviations Ke are averaged to obtain an average value. In the case of a plurality of deviations Ke, the average value may be used, or the latest deviation Ke may be used. Since the deviation Ke is a deviation with respect to the position of the crosshead 4, the deviation Ke is converted into a deviation with respect to the position of the movable platen 7 by a known conversion formula. Thereby, since the correction amount Ks for the movable platen 7 is obtained, the pressure receiving platen 12 is corrected to be displaced by this correction amount Ks. Thereby, the deviation Ke is canceled out.

  In this case, the correction process is performed at a specific timing set in advance without interrupting the molding cycle. As a specific timing without interrupting the molding cycle, a period other than the high-pressure mold clamping period, specifically, a mold opening period, a protruding period, an intermediate period, or the like can be used. Therefore, for example, if the protruding period is set as a period for performing the correction process, a correction command is output at the start timing of the protruding period, and the correction process is executed based on the correction command.

  In the correction process, first, the mold thickness adjusting motor 20 is driven and controlled based on the correction amount Ks, and the pressure receiving platen 12 is displaced in a direction in which the deviation Ke is eliminated. At this time, the pressure receiving platen 12 is moved at a lower speed than the normal speed. Further, the position of the pressure receiving platen 12 is detected by using an encoder pulse of a rotary encoder 21 attached to the mold thickness adjusting motor 20 to perform feedback control on the position. The rotary encoder 21 is an incremental encoder and detects an absolute position based on the number of encoder pulses generated with respect to a reference position. When the pressure receiving platen 12 is moved to the target position corresponding to the correction amount Ks (deviation Ke), the mold thickness adjusting motor 20 is controlled to stop. Such automatic correction processing enables timely and quick correction. On the other hand, the correction process can also be performed using the existing automatic mold clamping force setting function (automatic mold thickness adjusting function) in the toggle type mold clamping device Mc as it is. The automatic mold clamping force setting function is a function in which the mold clamping force is automatically set by setting a target value of the mold clamping force at an initial stage, for example, at the time of mold replacement. If such an existing automatic mold clamping force setting function is used, there is an advantage that more accurate correction can be performed and the cost is advantageous.

  Note that manual correction by an operator is also possible for such automatic correction. In manual correction, an allowable range Re with respect to the deviation Ke is set in advance, and if the deviation Ke exceeds the allowable range Re, it is only necessary to be notified by an alarm or the like, and based on this, the operator performs correction manually. be able to. This makes it possible to make corrections that take into account the experience and know-how of the operator, and if necessary, depending on the type of molded product, it can be determined that correction is not necessary, and production can be prioritized. Therefore, the production operation (automatic molding) is continued as it is until the operator performs an operation for correction. Such manual correction and automatic correction may be used alone or in combination. Such a correction processing method can be selected in advance by the selection key 71 on the display screen 3v of the display 3.

  As described above, in the screen display method according to the present embodiment, the graphic display unit 61 is provided in a part of the display screen 3v of the display 3, the position of the crosshead 4 in the toggle mold clamping device Mc is calibrated on the horizontal axis, and Since the load torque T associated with the closing of the mold 5 is plotted on the vertical axis, the physical quantity variation curve W with respect to the position of the crosshead 4 is graphically displayed. Therefore, this position is important for monitoring the toggle type mold clamping device Mc. That is, information on the mold closing position Cs that influences the mold clamping force Fm and the end positions Xe and Xf of the mold protection sections Zd1 and Zd2 set corresponding to the mold closing position Cs are fluctuated. The information can be displayed in correspondence with the curve W, and important information related to the toggle type mold clamping device Mc can be easily and accurately known. In particular, a mold protection end position Xe as a set value, a mold close position Cs as a detection value Dd, a mold close position reference as a reference value Ds, and an end position Xf related to a mold close monitor as a set value, Since they are displayed together, it is possible to easily and accurately grasp various kinds of information related to positions important for monitoring the toggle type mold clamping device Mc independently or by correlating them with each other.

  As described above, the best embodiment has been described in detail, but the present invention is not limited to such an embodiment, and the details, methods, configurations, numerical values, and the like are within the scope not departing from the gist of the present invention. It can be changed, added and deleted arbitrarily.

  For example, an abnormality such as a foreign object is a concept that includes not only a case where a molded product is sandwiched between molds 5 but also various abnormalities such as a failure or partial breakage of the mold 5 or the like. Further, although the output (torque monitor) of the driver 42 is used as the load torque T, a torque command that is an input of the torque limiter 41 may be used. On the other hand, the load torque T accompanying the closing of the mold 5 is used as a physical quantity in the detection of the mold closing position Cs. However, as other physical quantities, the speed V of the crosshead 4 accompanying the closing of the mold 5 and the mold 5 The acceleration A of the crosshead 4 accompanying the closing, the estimated torque E generated by the disturbance accompanying the closing of the mold 5, the positional deviation Xr of the crosshead 4 accompanying the closing of the mold 5, etc. can also be used. These physical quantities including the load torque T may be used alone or in combination. By combining them, the reliability can be further improved.

A display screen diagram of a display used for carrying out the screen display method according to the best embodiment of the present invention, Configuration diagram of a toggle type mold clamping device suitable for use in the implementation of the screen display method, A block circuit diagram showing a part of a molding machine controller provided in the toggle type mold clamping device, A variation curve diagram of load torque with respect to the position of the crosshead for explaining the screen display method; A display screen diagram showing another display mode of the display used for carrying out the screen display method; The flowchart which shows the processing procedure of closed position detection mode at the time of initial setting relevant to the screen display method, A flowchart showing a processing procedure of a mold clamping force correction method related to the screen display method, The flowchart which shows the processing procedure of closed position detection mode at the time of production operation relevant to the screen display method, Variation curve diagram of load torque with respect to the position of the crosshead for explaining the background art,

Explanation of symbols

2 Molding machine controller 3 Display 3v Display screen 4 Cross head 5 Mold 61 Graphic display section 62 ... Numerical display section 62 h ... First display section 62 x ... Second display section 62 c ... Cursor 7 Movable platen Mc Toggle type clamping device W Fluctuation Curve T Load torque Xe Mold protection end position Xf End position related to mold closing monitor Cs Mold closing position

Claims (3)

  In a screen display method of a molding machine controller for displaying one or two or more monitor display sections on a display screen of a display attached to the molding machine controller, a toggle type clamping device on a horizontal axis at least on a part of the display screen The crosshead position at the scale is scaled and the vertical axis indicates the load torque associated with mold closing, the speed of the crosshead associated with mold closure, the acceleration of the crosshead associated with mold closure, and the disturbance associated with mold closure. A graphic display unit that graphically displays a fluctuation curve of the physical quantity with respect to the position of the crosshead by calibrating the physical quantity related to the estimated torque generated by the position of the crosshead or the positional deviation of the crosshead accompanying the closing of the mold alone or in combination And one or more set values (reference values) and / or detection values related to the position of the crosshead are displayed numerically. In addition, one or two or more numerical value display portions with different color schemes are provided, and the graphic display portion corresponds to the set value (reference value) and / or the detected value, and the numerical value display for each color. A screen display method for a molding machine controller, wherein one or two or more cursors matched with a color scheme of a part are displayed.   The numerical display unit includes a first display unit that displays a position of the crosshead, and a second display unit that converts the position of the crosshead into a position of a movable platen in the toggle type mold clamping device. The screen display method of the molding machine controller according to claim 1.   The set value (reference value) and / or the detected value includes at least a mold protection end position as a set value, a mold closed position as a detected value, a mold closed position reference as a reference value, and a set value. The screen display method for a molding machine controller according to claim 1, further comprising one or more end positions related to the mold closing monitor.

Images