JP3698671B2 - Molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding machine such as an injection molding machine or a die-casting machine having a function of displaying an actual measured value of an operating state on a display screen of a display device, and more particularly to a control technique for displaying measured data in a graphic form. Is.
[0002]
[Prior art]
In a molding machine such as a recent injection molding machine, the measured speed data and the measured pressure data of the measurement target at the time of molding operation are graphically displayed on the display screen of a display device attached to the molding machine, The molding operation state can be monitored with good visibility.
[0003]
In the case of performing graphic display as described above, conventionally, sampling processing of graph data for display on a display screen has been performed at regular time intervals. For this reason, when the movement speed of the measurement target is high, the number of samples for a certain amount of movement stroke of the measurement target is smaller than that when the movement speed of the measurement target is low. End up.
[0004]
FIG. 7 is an example of velocity measurement graphic data of the measurement target when velocity data is sampled at regular intervals. In FIG. 7, the horizontal axis represents the movement position of the measurement target, the vertical axis represents the speed of the measurement target, and the small circle represents the speed sampling data. As shown in FIG. 7, the speed sampling data is coarse in the high speed movement area, and the speed sampling data is dense in the low speed movement area. Therefore, the measured speed graphic data displayed by connecting the speed sampling data of the small circle with lines cannot be denied that the drawing is rough in the high-speed movement area and the fine drawing in the low-speed movement area.
[0005]
[Problems to be solved by the invention]
As described above, when the velocity data is sampled at regular intervals, the display of the actually measured velocity graphic data along the position axis is a rough line drawing in the high-speed movement area and a fine line drawing in the low-speed movement area. There is a tendency. For this reason, if the sampling time interval is set so that the number of samples in the low-speed movement area is appropriate, the number of sampling in the high-speed movement area decreases, and the line drawing in the high-speed movement area is smooth and clean. There is a problem of not becoming. In order to eliminate this point, if the sampling time interval is shortened so as to increase the number of samples in the high-speed movement area, the number of samples in the low-speed movement area will increase extremely, and the object to be measured has almost stopped. In such a very low speed region, the capacity of the buffer memory for storing the sampling data becomes excessive, and there is a problem that the graph is drawn only halfway.
[0006]
In order to cope with such a problem, it may be considered that the operator of the molding machine sets the sampling time interval for each region having different speeds to an appropriate value. However, in this case, there is a problem that the burden on the operator increases, the operation is complicated, and experience and knowledge are required to set an appropriate value.
[0007]
The present invention has been made in view of the above points, and its object is to automatically control the sampling time interval so that it is short in the high-speed movement region and long in the low-speed movement region. The purpose of this is to enable smooth and clear graphic display in both low-speed moving areas.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, according to a typical invention of the present invention, in a molding machine having a function of displaying an actual measurement value of a molding machine on a display device, an object to be measured is provided. Detecting means for detecting and outputting the position at every control scan time, and determining whether or not the position change amount of the measurement target from the previous sampling timing is equal to or greater than a predetermined value, The position change amount determination means for outputting a sampling command signal when the value exceeds the value, and whether the accumulated time of the system control scan time from the previous sampling timing is equal to or greater than a predetermined value. A time change amount determining means for outputting a sampling command signal when the predetermined value is exceeded, and the position change amount determining means or the time change amount determining means. Based on the sampling command signal outputted from either the first, the actual measurement value sampling means for performing at least the rate of sampling of the measured object, a configuration equipped.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
<First Embodiment>
FIG. 1 is a block diagram showing a configuration of a graphic display processing system of injection speed in the injection molding machine according to the first embodiment of the present invention. In FIG. 1, 1 is an injection servo motor, 2 is a ball screw mechanism that converts rotation of the motor 1 into linear motion, 3 is a screw that is linearly driven by the ball screw mechanism 2, and 4 is an encoder attached to the injection servo motor 1. Reference numeral 5 denotes a position / speed detecting means for detecting the position of the screw 3 based on the output of the encoder 4 and calculating (detecting) speed data based on the position detection data and time information. Reference numeral 6 denotes a position / speed detecting means 5. Is a sampling timing control means for controlling the timing at which the speed data is sampled, 7 is a buffer memory for storing the actually measured speed data output from the position / speed detection means 5, and 8 is an image process for the output of the buffer memory 7 as appropriate A display processing unit 9 for outputting as graphic data, and an image processing unit 9 for displaying the output of the image processing unit 8 on the screen. It is the location. In the position / velocity detection means 5, 5a is a position detection section, 5b is a speed sampling section, and in the sampling timing control means 6, 6a is a position change accumulation section, and 6b is a position change amount determination section.
[0011]
The servo motor 1 for injection is driven and controlled by speed feedback control along the position axis in the primary injection stroke of the injection stroke by a drive signal S1 from a servo amplifier (not shown), and the time axis in the pressure holding stroke of the injection stroke. Is driven and controlled by pressure feedback control. The rotation of the injection servo motor 1 is converted into a linear motion by the ball screw mechanism 2 and transmitted to the screw 3. In the primary injection stroke of the injection stroke, the screw 3 is driven rapidly forward, and a molten resin mold is obtained. Injecting / filling is performed, and in the pressure-holding process of the injection process, pressure-holding is applied to the resin in the mold by pressure feedback control.
[0012]
The output signal S2 of the encoder 4 attached to the injection servo motor 1 is input to the position detection unit 5a of the position / velocity detection means 5. In the position detection unit 5a, every control scan time (for example, 10 msec). The position data is obtained and output to the speed sampling unit 5 b and also to the position change accumulation unit 6 a of the sampling timing control means 6.
[0013]
The position change accumulating unit 6a of the sampling timing control means 6 adds and accumulates the position data Δx sent from the position detecting unit 5a every control scan time, and uses the accumulated value (accumulated position change amount) of this position data. A certain Σx1 is output to the position change amount determination unit 6b. The position change amount determination unit 6b compares Σx1 output from the position change accumulation unit 6a with a predetermined reference value Xc (for example, 1.0 mm), and at a timing when Σx1 ≧ Xc, A sampling command signal S4 is output, and control is performed so that the contents of the position change accumulation unit 6a are cleared to zero.
[0014]
The velocity sampling unit 5b of the position / velocity detection unit 5 captures the current position data fetched as the latest value from the position detection unit 5a and the previous sampling timing each time the sampling command signal S4 arrives from the sampling timing control unit 6. Based on the position data and the clock information S3 (determining the time difference between the previous sampling timing and the current sampling timing from the clock information S3), the speed sampling process for obtaining the actual speed data is executed. The speed data S6 detected (calculated) by the speed sampling unit 5b is output to the buffer memory 7 and temporarily stored therein.
[0015]
In the display processing unit 8, based on the control signal S7 from the host controller, the speed data S6 read from the buffer memory 7 and image generation data S8 such as ruled lines, text, and figures necessary for image output are appropriately imaged. The output image data is generated by processing, and is output to the display device 9 via a frame memory (not shown). Thereby, the display device 9 performs graphic display of the actually measured speed data of the injection stroke on the display screen.
[0016]
FIG. 2 is a diagram showing a processing flow of the speed sampling operation of the present embodiment. In FIG. 2, ST1, ST2, and ST3 are an input processing step, an operation / control entity processing step, and an output processing step, respectively, of the system roller that controls the entire machine. These step ST1 of the system controller, step ST2 of the process, and step ST3 of the output are repeated without interruption when the machine is in operation, and the control scan time which is one cycle of step ST1 → ST2 → ST3 is, for example, 10 ms.
[0017]
One of the many processing flows in the input step ST1 includes an injection speed sampling processing flow. In FIG. 2, the processing flow in step ST1 is shown for the sake of simplification. Only the flow of the sampling process of the injection speed is shown. In step ST101, in step ST101, the process for obtaining the accumulated value Σx1 of the position data (“x1 ← x1 + Δx”) is performed, and the cycle of ST1 → ST2 → ST3 is repeated until Σx1 ≧ Xc is determined in step ST102. If the determination in step ST102 is YES, the process proceeds to step ST103. In step ST103, the speed sampling process for obtaining the actually measured speed data is executed. In the next step ST104, the contents of the position change accumulating unit 6a are cleared to 0 (“x1 ← 0”). In the process step ST2, it is shown in a simplified manner that processes such as mold clamping, injection, weighing, mold opening and the like are sequentially performed.
[0018]
FIG. 3 is a diagram showing an example of a measured speed graphic display of the primary injection stroke in the injection stroke according to the present embodiment. In FIG. 3, the vertical axis represents the speed of the screw 3, and the horizontal axis represents the position (stroke) of the screw 3 with the holding pressure switching point being 0. Also, the dots represent speed sampling data, and the speed measurement graphic data is displayed in a form in which the dots are connected by lines.
[0019]
In the present embodiment, the sampling of the speed in the primary injection stroke of the injection stroke is performed at each timing when Σx1 ≧ Xc as described above. As a result, in any of the acceleration region A1, the high-speed region A2, the deceleration region A3, the medium-speed region A4, and the deceleration region A5, regardless of the magnitude of the speed, the approximate predetermined movement amount (that is, approximately Xc ), The speed sampling data is displayed every time, and the interval in the horizontal axis direction of each dot becomes substantially uniform. That is, since the high speed region A1 is high speed, the time during which Σx1 is equal to or greater than Xc is earlier than that of the medium speed region A4, and although not shown, when there is a low speed stroke in the primary injection stroke, In the speed region A4, the time during which Σx1 is equal to or greater than Xc is earlier than in the low speed region, and accordingly, the sampling time interval is automatically controlled to be short in the high speed movement region and long in the low speed movement region. Is possible. Therefore, smooth and clear graphic display can be performed in the entire region of the primary injection stroke.
[0020]
In FIG. 3, the sampling data is indicated by dots for convenience of explanation, but only the line drawing is displayed in the actual graphic display (the same applies to the next embodiment).
[0021]
Second Embodiment
FIG. 4 is a block diagram showing the configuration of an injection speed graphic display processing system in an injection molding machine according to the second embodiment of the present invention. In FIG. 4, parts equivalent to those in FIG. However, the explanation is omitted to avoid duplication.
[0022]
In FIG. 4, 6 'is a sampling timing control means, 6c is a time change accumulation part, 6d is a time change amount determination part, and 6e is an OR circuit part.
[0023]
The time change accumulating unit 6c of the sampling timing control means 6 ′ adds and accumulates control scan time data Δt (for example, 10 ms) sent from the host controller every control scan, and accumulates the accumulated value (accumulated time) of this time data. Change amount) Σt1 is output to the time change amount determination unit 6d. The time change amount determination unit 6d compares Σt1 output from the time change accumulation unit 6c with a predetermined reference value Tc (for example, 200 msec), and at the timing when Σt1 ≧ Tc, the sampling command The signal S5 is output.
[0024]
The OR circuit unit 6e of the sampling timing control means 6 'is either the sampling command signal S4 output from the position change amount determination unit 6e or the sampling command signal S5 output from the time change amount determination unit 6d. The sampling command signal output first from either one is output to the speed sampling unit 5b of the position / velocity detecting means 5, and the position change is triggered by sending the sampling command signal to the speed sampling unit 5b. The contents of the accumulation unit 6a and the time change accumulation unit 6c are cleared to zero.
[0025]
As a result, an extremely low speed region in which the screw 3 has not moved more than a predetermined stroke Xc (here, for example, 1.0 mm) while a predetermined time Tc (here, for example, 200 msec) has elapsed since the previous sampling timing. In this extremely low speed region including a complete stop state, a sampling command signal S5 based on time monitoring is output to the speed sampling unit 5b. In addition, an area in which the screw 3 is moved by a predetermined stroke Xc (here, for example, 1.0 mm) or more while a predetermined time Tc (here, for example, 200 msec) has elapsed since the previous sampling timing (the above-mentioned poles). In a non-low speed region), a sampling command signal S4 based on stroke monitoring is output to the speed sampling unit 5b.
[0026]
FIG. 5 is a diagram showing a processing flow of the speed sampling operation of the present embodiment. In FIG. 5, ST1, ST2, and ST3 are the input processing step and the calculation / control entity processing step described in FIG. This is an output processing step.
[0027]
In this embodiment, in step ST111 in step ST1, the position data cumulative value Σx1 is obtained (“x1 ← x1 + Δx”) and the time data (control scan time data Δt) cumulative value Σt1 is obtained. The process (representing “t1 ← t1 + Δt”) is repeated in a cycle of ST1 → ST2 → ST3 until Σx1 ≧ Xc is determined in step ST112 or Σt1 ≧ Tc is determined in step ST113. If YES is determined in step ST112 or YES in step ST113, the process proceeds to step ST114, and speed sampling processing for obtaining actually measured speed data is executed. In the next step ST115, the contents of the position change accumulation unit 6a are cleared to 0 (“x1 ← 0”), and the contents of the time change accumulation unit 6c are cleared to 0 (“t1 ← 0”). To do).
[0028]
FIG. 6 is a diagram showing an example of an actually measured speed graphic display of the injection stroke according to the present embodiment. In FIG. 6, the vertical axis represents the speed of the screw 3, and in the region of the primary injection stroke on the right side from the holding pressure switching point, the horizontal axis represents the screw position (stroke), and the left side from the holding pressure switching point. In the region of the pressure holding stroke, the horizontal axis represents time. In addition, dots represent speed sampling data, and speed measurement graphic data is displayed in a form in which the dots are connected by lines.
[0029]
In the example shown in FIG. 6, the primary injection stroke is not a very low speed region. Therefore, in the primary injection stroke region, as described above, the speed of ΣΔx1 ≧ Xc is reached. Sampling processing is performed. As a result, in any of the acceleration region A1, the high speed region A2, the deceleration region A3, the medium speed region A4 ′, and the deceleration region A5, regardless of the magnitude of the speed, the approximate predetermined amount of movement of the screw 3 (ie, approximately The speed sampling data is displayed every Xc), and the interval between the dots in the horizontal axis direction is substantially uniform. That is, since the high speed region A1 is high speed, the time during which Σx1 is equal to or greater than Xc is faster than the medium speed region A4 ′, and although not shown, when the primary injection stroke has a low speed stroke, In the medium speed region A4 ′, the time for Σx1 to be equal to or greater than Xc is earlier than in the low speed region, and accordingly, the sampling time interval is automatically controlled to be short in the high speed movement region and long in the low speed movement region. It becomes possible to do. Therefore, smooth and clear graphic display can be performed in the entire region of the primary injection stroke.
[0030]
In the example shown in FIG. 6, the pressure holding stroke is all in a very low speed region. For this reason, in the pressure holding stroke region, the speed sampling is performed at the timing when ΣΔt1 ≧ Tc as described above. Processing is performed. As a result, in the pressure holding region, speed sampling data is displayed for each predetermined reference value Tc, and in this case as well, the number of sampling points can be controlled appropriately with respect to the display scale, so that a smooth and clean graphic can be obtained. Display can be performed.
[0031]
For example, when the display screen of the display device 9 is 640 × 400 dots, if the number of sampling points is about 500, it is possible to draw a very beautiful graph. The values of the constant Xc and the constant Tc may be set so that they can be achieved.
[0032]
In addition, although the setting of the speed | rate made into extremely low speed is arbitrary, it is suitable when the moving speed of the screw 3 is made into the extremely low speed about 0-10 mm / sec.
[0033]
In the embodiment described above, the application to the graphic display of the speed of the injection stroke has been described. However, the present invention relates to the weighing stroke of the injection molding machine, the mold closing (clamping) stroke, the mold opening stroke, and the ejection protrusion. The present invention can also be applied to the speed graphic display in the stroke and eject return stroke. Similarly, the present invention can also be applied to speed graphic display in the injection process, mold closing (clamping) process, mold opening process, eject ejection process, and eject return process of the die casting machine.
[0034]
Further, in the primary injection stroke of the injection stroke of the injection molding machine, the higher the injection speed, the larger the injection pressure tends to behave (the pressure tends to change greatly in a short time when the injection speed is high). ) By applying the present invention to the graphic display of the pressure in the primary injection stroke, it is possible to display a smooth and clean graphic display.
[0035]
【The invention's effect】
As described above, according to the present invention, the sampling time interval can be automatically controlled appropriately so as to be short in the high-speed movement area and long in the low-speed movement area. Display can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an injection speed graphic display processing system in an injection molding machine according to a first embodiment of the present invention.
FIG. 2 is a flowchart showing a flow of processing of a speed sampling operation in the injection molding machine according to the first embodiment of the present invention.
FIG. 3 is an explanatory diagram showing an example of a measured speed graphic display of an injection stroke in the injection molding machine according to the first embodiment of the present invention.
FIG. 4 is a block diagram showing a configuration of a graphic display processing system of injection speed in an injection molding machine according to a second embodiment of the present invention.
FIG. 5 is a flowchart showing a flow of processing of a speed sampling operation in the injection molding machine according to the second embodiment of the present invention.
FIG. 6 is an explanatory diagram showing an example of a measured speed graphic display of an injection stroke in an injection molding machine according to a second embodiment of the present invention.
FIG. 7 is an explanatory diagram showing an example of a speed measurement graphic display of a measurement target according to a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection servo motor 2 Ball screw mechanism 3 Screw 4 Encoder 5 Position / speed detection means 5a Position detection part 5b Speed sampling part 6, 6 'Sampling timing control means 6a Position change accumulation part 6b Position change amount determination part 6c Time change accumulation part 6d Time variation determination unit 6e OR circuit unit 7 Buffer memory 8 Display processing unit 9 Image processing device

Claims (3)

In a molding machine with the function of displaying the actual measured value of the operating state of the molding machine on the display device,
Detection means for detecting and outputting the position of the measurement target for each control scan time, and determining whether or not the position change amount of the measurement target from the previous sampling timing is equal to or greater than a predetermined value. When the value exceeds a predetermined value, the position change amount determining means for outputting a sampling command signal and sampling of at least the speed of the measurement target are performed based on the sampling command signal output from the position change amount determining means. A molding machine characterized by comprising measured value sampling means. In a molding machine with the function of displaying the actual measured value of the operating state of the molding machine on the display device,
Detection means for detecting and outputting the position of the measurement target for each control scan time, and determining whether or not the position change amount of the measurement target from the previous sampling timing is equal to or greater than a predetermined value. If the position change amount determination means outputs a sampling command signal when it exceeds a predetermined value, and whether the cumulative time of the system control scan time from the previous sampling timing has exceeded a predetermined value If it exceeds the predetermined value, the time change amount determining means for outputting a sampling command signal and the position change amount determining means or the time change amount determining means are output first. An actual value sampling means for sampling at least the speed of the object to be measured, based on the sampling command signal. Form machine. In claim 1,
The molding machine is an injection molding machine, and the pressure data of the primary injection stroke is sampled together with the speed data.

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