JP2978624B2 - Injection graphic image display method of injection molding machine and injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection graphic image display method for an injection molding machine and an injection molding machine.
The present invention relates to a method for displaying a graphic image of injection data in an injection molding machine having two injection units for one mold opening / closing mechanism (one mold).

[0002]

2. Description of the Related Art A typical example of a machine having two injection units for one mold opening / closing mechanism is an injection molding machine for two-color molding. This two-color molding injection molding machine generally includes, for example, A
After the completion of the injection of the color resin (or the X-type resin), the second injection unit injects, for example, the B-color resin (or the Y-type resin), and the two-color resin (or the two different resins) are combined. An integrated molded product (product) is obtained. That is, in this type of injection molding machine for two-color molding, a mechanism or the like capable of changing the shape (volume) of the cavity of the mold is provided. Is formed, and then the A-color resin is injected and filled therein. Then, at the time of injection by the second injection unit, the shape of the cavity is changed to form a filling space exclusively for the B-color resin, for example. B resin is injected and filled. Therefore,
In an injection molding machine for two-color molding of a type employing such a molding method, the shape occupied by each resin injected from the first and second injection units can be defined from the mold structure. In this type of injection molding machine for two-color molding, generally, for example, an A-color resin and a B-color resin are provided with a meshing portion to prevent separation.

A machine having two injection units for one mold opening / closing mechanism includes a type in which two injection units simultaneously perform injection. This type includes a machine for forming a marble (marble) pattern. A mixed-color injection molding machine, and an injection molding machine for special two-color molding that defines to a certain extent the shape occupied by the A-color resin (or X-type resin) and the B-color resin (or Y-type resin) to which the present invention is applied. There is. In the former mixed-color injection molding machine, for example, the tips of two injection units are guided to the same nozzle, and for example, A, B2
Mixing color resin and injecting and filling into cavity to obtain molded product with marble pattern, the positional relationship between A color resin and B color resin (in other words, change of marble pattern) is almost a problem Does not. However, in the latter type of injection molding machine, two different positions for the cavity are required.
For example, one injection unit simultaneously injects and fills the A-color resin and the B-color resin, satisfactorily fuses the boundary (merging portion) between the A-color resin and the B-color resin, and furthermore, combines the A-color resin and the B-color resin. Since it is necessary to define the shape to be occupied to some extent, A and B injected and filled into the cavity from the two injection units
The resin behavior at the confluence of the two colors of resin is an important monitoring factor for good quality molding.

[0004]

As described above, in an injection molding machine of the type in which two injection units simultaneously fill, for example, an A-color resin and a B-color resin from different positions with respect to the cavity. Although the resin behavior at the confluence of the injected and filled A and B color resins was an important monitoring factor, in the conventional injection molding machine of this type, the movement of the two injection units during the injection stroke was considered. At the same time, no consideration was given to grasping simultaneously, and it was not possible to simultaneously confirm or monitor on the display screen whether the injection operation by the two injection units was performed satisfactorily (A and B colors). It was not possible to simultaneously confirm or monitor the behavior of the resin at the junction of the resins on the display screen).

[0005] The present invention has been made in view of the above points,
The purpose is to be able to simultaneously confirm the movement of the two injection units during the injection process on the display screen, and thus to provide a method for displaying an injection graphic image of an easy-to-use injection molding machine with excellent monitoring visibility. To provide.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a plurality of mold opening / closing mechanisms.
For example, two injection units are provided, and the two injection units perform injection almost simultaneously so that the injection periods from the two injection units to the mold cavity attached to the mold opening / closing mechanism substantially overlap each other. In an injection graphic image display method for a molding machine, each measured data of the injection strokes of two injection units, that is, for example, each injection pressure data is graphically displayed on one display screen in such a manner as to be written along the same time axis. To be.

[0007]

The respective injection pressure data of two injection units that perform injection almost simultaneously are displayed graphically (line drawing) on a color CRT display attached to a machine (injection molding machine) along the same time axis. (Display), the flow of the resin injected into the cavity by the two injection units can be compared (observed). That is, for example, in the graphic data of the injection pressure, if the injection pressure rapidly rises and shows a peak after a predetermined time from the start of injection, it can be considered that the injection screw has reached the forward limit. Therefore, when the peak times at which the two injection pressures suddenly rise coincide with each other, the times at which the two screws reach the forward limit coincide, and the two resins are merged in a suitable state while flowing (in a state where they are molten with each other). Can be determined). On the other hand, when the injection pressure of one injection unit still indicates the flow state of the resin,
When only the injection pressure of the other injection unit rapidly rises, it can be determined that the other resin has joined after the injection of one resin is completed and the solidification of the resin starts.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 is a simplified block diagram of a control system of the injection molding machine according to the embodiment, FIG. 2 is a plan view of the injection molding machine according to the embodiment, and FIG. 3 is formed by the injection molding machine according to the embodiment. FIG. 4 is a diagram showing a test piece as an example of a molded product, and FIGS. 4 to 7 are explanatory diagrams showing graphic display images on a display device.

First, the basic configuration of the machine (injection molding machine) of this embodiment will be described with reference to FIG. In FIG. 2, 1 is a mold opening / closing mechanism, 2 is a first injection unit, and 3 is a second injection unit.
Injection unit. Although not shown in detail, the mold opening / closing mechanism 1 has a known configuration, and includes a fixed die plate having a fixed mold attached thereto and a movable die plate having a movable mold attached thereto and moving back and forth with respect to the fixed die plate. There is provided a support plate on which a mold clamping cylinder (hydraulic cylinder) for moving the movable die plate back and forth is mounted, and further, a movable die plate is slidable between the fixed die plate and the support plate. It includes a tie bar, a well-known toggle link mechanism disposed between the support plate and the movable die plate, and driven by a mold clamping cylinder. Reference numerals 4 and 5 denote an in-mold pressure sensor for detecting the resin pressure in the cavity of the mold. The in-mold pressure sensor 4 measures the pressure of the resin portion filled by the first injection unit 2, and detects the in-mold pressure. The sensor 5 measures the pressure of the resin portion filled by the second injection unit 3.

The first and second injection units 2,
3 also employs a well-known in-line screw type mechanism, which does not show a detailed cross section, and a heating cylinder, a heating cylinder, and a heating mechanism, respectively, which are capable of rotating and moving a screw for kneading plasticization and injection, respectively. A nozzle attached to the tip of the cylinder, a hopper for supplying raw resin to the rear end of the heating cylinder, a hydraulic motor for rotating the screw during the charge stroke, and an injection cylinder (hydraulic for moving the screw forward during the injection stroke) Cylinder). During the continuous molding operation, the nozzles of the first and second injection units 2 and 3 are kept in a state where the nozzles touch the two resin injection ports (sprue bushes) on the fixed mold side, respectively. The screws of the first and second injection units 2 and 3 are advanced substantially simultaneously to inject and fill the A-color resin into the cavity of the mold by, for example, the first injection unit 2. At 3, the B-color resin is injected and filled. As a result, for example, as shown in FIG. 3, a molded product 30 in which the A-color resin 31 and the B-color resin 32 are fused and integrated at the joining portion (fusion portion) 33 is obtained. The molded product 30 shown in FIG. 3 is a test piece for testing the strength of the confluence between the A-color resin 31 and the B-color resin 32, which is the fusion portion 33. By providing them, the strength test can be easily performed.

In FIG. 2, reference numeral 6 denotes an injection pressure sensor of the first injection unit 2, reference numeral 7 denotes an injection pressure sensor of the second injection unit 3, and reference numerals 8 and 9 denote key inputs provided to the machine. Device and display device.

Next, a control system of the injection molding machine of this embodiment will be described with reference to FIG. In FIG. 1, reference numeral 11 denotes a microcomputer (microcomputer) that controls the operation and display of the entire machine (injection molding machine), and 12 denotes a large number of sensors provided in each part of the machine including the sensors 4 to 7. A group of sensors 13 is a driver group composed of a number of driver circuits for driving and controlling a number of driving sources provided in each part of the machine, and 8 is the above-mentioned group arranged on the front side of the machine. Key input device 9 is key input device 8
Is a display device including, for example, a color CRT display, a color LCD, etc., disposed adjacent to the display device.

The microcomputer 11 shown in FIG. 1 controls the entire molding process such as a charging operation, an injection operation, a mold opening / closing operation, and an ejecting operation, calculates and stores actual measured data,
Calculation / determination processing such as defective product determination processing, abnormality determination processing, etc.
Alternatively, various processes such as a display control process of an output image of the display device 9 are executed. This microcomputer 11 is actually composed of various I / O interfaces, ROM, RAM, CPU
In the present embodiment, the molding condition setting storage unit 14 and the molding process control unit 1 perform various processes according to various programs created in advance.
5, the following description will be given assuming that it includes the measured value storage unit 16, the display processing unit 17, and the like. The measured value storage unit 16 includes a first injection unit data storage unit 18 and a second injection unit data storage unit 19, and the display processing unit 1
7 includes a data conversion processing unit 20, a fixed display data storage unit 21, a display image data generation unit 22, and the like.

Various operating condition values input by the key input device 8 and the like are stored in the molding condition setting storage unit 14 in a rewritable form. The operating condition values include, for example, a tightening force, an electric power value, a relationship between a screw position and a screw rotation speed, a screw retreat speed, and a back pressure during a charge stroke of each of the two injection units 2 and 3; Injection speed conditions and injection pressure conditions (1
Next injection control conditions) Secondary injection pressure (holding pressure) conditions from the holding pressure switching point of each of the two injection units 2 and 3 to the end of holding pressure, band heater temperature of each part, mold closing (mold closing) stroke And mold control force, mold opening stroke, mold opening stroke and speed control condition, eject control condition, and the like.

The molding process control unit 15 controls the sensor group 12 provided in each unit of the machine based on a molding process control program created in advance and setting condition values stored in a molding condition setting storage unit 14. (A position sensor, a pressure sensor, a temperature sensor, etc.) while referring to data from the actual measurement value storage unit 16 that captures measurement information in real time and time measurement information from a clock incorporated therein.
A corresponding drive source is driven and controlled via the driver group 13 (motor driver, hydraulic cylinder driver, heater driver, etc.) to execute a series of molding steps. Note that, specifically, the sensors included in the sensor group 13 are as follows.
ACC (accumulator) charge pressure detection sensor,
Screw stroke detection sensor, screw rotation number detection sensor, injection pressure and back pressure detection sensor (the pressure sensors 6 and 7), mold opening / closing stroke detection sensor, mold clamping pressure detection sensor, mold pressure detection sensor (the pressure sensor 4 and 4)
5), eject ejection / return stroke detection sensor,
An eject cylinder pressure detection sensor, a temperature sensor of each part, a power value detection sensor, and the like are included.

The actual measurement value storage section 16 receives all actual measurement data of preset monitor items of the latest shot during continuous automatic operation, and always rewrites and updates the actual operation data of the latest shot. Holding this. If there is room in the capacity of the measured value storage unit 16, the measured data of several consecutive shots are loaded and the FI
It is rewritten and updated to the FO type. The monitored items to be captured include a time monitoring item, a position monitoring item, a rotation speed monitoring item, a speed monitoring item, a pressure monitoring item, a temperature monitoring item, a power monitoring item, and the like. Are almost overlapped. Then, the actual measurement data relating to the first injection unit 2 is stored in the first injection unit data storage unit 18, and the actual measurement data relating to the second injection unit 3 is stored in the second injection unit data storage unit 19. .

The display processing unit 17 is adapted to display display image data of a designated display mode based on a display image creation / control program created in advance by a command for calling a display image in a mode desired by the operator via the key input device 8. Create That is, when a call instruction of a predetermined display image arrives by the operator, the data conversion processing unit 20 in the display processing unit 17 stores the information stored in the molding condition setting storage unit 14 and the measured value storage unit 16 as necessary. , Data to be used for displaying the display mode image is extracted, and the data is converted into a form corresponding to the specified display mode of the display mode image. For example, if the designated display mode is a graphic image of a certain process, the extracted data is converted into graph data (coordinate data) to obtain line drawing-processed image data. Forward. The display image data generation unit 22 generates graph scale image data and scale numerical image data at a predetermined magnification by a graph scale (graph scale) generation program created in advance, and sends them from the data conversion processing unit 20. The data is combined with the graph data, and the fixed data necessary for displaying the display mode image is extracted from the display fixed data storage unit 21 and converted into predetermined character / symbol mark image data. The image data is combined with the image data for the screen and transferred to and stored in a frame buffer (not shown). The image data temporarily stored in the frame buffer is transmitted to the display processing unit 1.
7 is sent to the display device 9 according to the command of 7, and the graphic image data is displayed on the display screen of the display device 9.

FIG. 4 shows an example of the injection pressure graphic image of the injection stroke called on the display screen 9a of the display device 9 by the key operation of the operator. In the figure, the injection pressures of the first and second injection units 2 and 3 during the injection stroke are displayed along the same time axis, the horizontal axis is the time axis, and the vertical axis is the vertical axis. Reference numeral 41 denotes an injection pressure of the first injection unit 2 (measured data by the injection pressure sensor 6), and reference numeral 42 denotes an injection pressure of the second injection unit 3 (measured by the injection pressure sensor 7). ), And the injection pressure graph data 41 and 42 are classified into different colors such as red and blue, for example, so as to enhance discrimination. In the example shown in the figure, the first and second injection units 2 and 3 are simultaneously started to be injected, and when a predetermined time has elapsed after the start of the injection,
For example, the A-color resin and the B-color resin injected and filled into the cavities in the first and second injection units 2 and 3 respectively begin to merge, and the injection pressure 41 of the first injection unit 2 and the second injection The injection pressure 42 of the unit 3 is equal to the P ₁ part and the P ₂
Indicates the rise by substantially simultaneously merge load pressure in Part After this, injection pressure 42 and the injection pressure 41 rises sharply, reaching simultaneously peak at t ₀ time. That is,
The fact that the injection pressures 41 and 42 simultaneously reached the peak at the time point t ₀ means that the first and second injection units 2 and 3
Can be regarded as having reached the forward limit simultaneously (t
_In this case, both the A-color resin and the B-color resin merge in a completely molten state at the merging site (fusion site), so that good (normal) fusion is obtained. Since the screws of the first and second injection units 2 and 3 have reached the forward limit synchronously (because one is not too fast or the other is too slow), the A-color resin It can be considered that the boundary line between the color resin and the color B resin (the occupation range of the color A resin and the color B resin) also falls within the allowable range.

[0019] In FIG. 4, Q _1, Q ₂ indicates the completion of the primary injection timer respectively, the Q _1,
Q ₂ points later, the resin pressure in the mold by the mold internal pressure sensor 4 and 5 are shown. In this way, by displaying the resin pressure in the mold following the injection pressure, the state of the pressure drop of each resin after merging, that is, the shrinkage behavior of each resin can be simultaneously known.

FIG. 5 shows another example of the injection pressure graphic image of the injection stroke. In the example shown in FIG.
The injection of the first injection unit 2 is started first, and the injection of the second injection unit 3 is started after a predetermined time has elapsed. 5, the injection pressure 41 of the first injection unit 2 and the injection pressure 42 of the second injection unit 3 at the time when a predetermined time has elapsed after the start of injection of both the injection units 2 and 3 have elapsed. but it showed a rising due substantially simultaneously merge load pressure at P ₁ parts of P ₂ parts Thereafter, injection pressure 42 and the injection pressure 41 rises sharply, reaching simultaneously peak at t ₀ time. Therefore, also in this case, the first and second injection units 2
Since it is considered that the screw No. 3 has reached the forward limit at the same time at the point of time t ₀ , for example, the A-color resin and the B-color resin merge together (in a completely melted state) at the merging site (fusion site), It can be determined that good fusion has been obtained, and the boundary line between the A-color resin and the B-color resin (the occupied range of the A-color resin and the B-color resin) can be considered to be within the allowable range.

FIG. 6 shows still another example of the injection pressure graphic image in the injection stroke. In the example shown in FIG. 6, the first and second injection units 2 and 3 are started simultaneously. However, the injection pressure 42 of the second injection unit 3
Rises _first and reaches a peak at time t ₁ , and only the screw of the second injection unit 3 reaches the advance limit first. After that, the injection pressure 4 of the first injection unit 2
1 has reached the peak at t ₂ when I rise. Therefore,
In this case, the primary injection of the second injection unit 3 is too early in comparison with the primary injection of the first injection unit 2, so that the second injection
After the solidification of, for example, the B-color resin injected by the injection unit 3 starts, it can be determined that the injection / filling of, for example, the A-color resin by the first injection unit 2 has been completed, and the A-color resin and B
Since the color resins do not merge in a fluidized state (melted state), the joining force at the merged portion is insufficient, and the boundary between the A-color resin and the B-color resin is also irregular (A-color resin and B-color resin). Is out of tolerance. Therefore, when such defective molding occurs, the cause can be estimated from the injection pressure graphic image, and quick measures can be taken.

FIG. 7 shows an injection stroke graphic image that can be displayed as a modified example of the injection graphic image of the injection stroke. In the figure, the injection strokes (screw advance strokes) of the first and second injection units 2 and 3 during the injection stroke are displayed along the same time axis, and the horizontal axis is the time axis. The vertical axis indicates the injection stroke, and 43 indicates the first injection unit 2
The injection stroke 44 is the injection stroke of the second injection unit 3, and the injection strokes 43 and 44 are also classified into different colors such as red and blue, for example, to enhance the discrimination. In the graphic image of FIG. 7, the forward strokes of the screws at each point in the primary injection stroke of the first and second injection units 2 and 3 can be compared at a glance. The flow behavior of the two resins during the injection process can be observed or studied in comparison.

[0023]

As described above, according to the present invention, the movement of the two injection units during the injection stroke can be simultaneously confirmed on the display screen, and the injection graphic of the easy-to-use injection molding machine with excellent monitoring visibility. An image display method can be provided, and its value is great.

[Brief description of the drawings]

FIG. 1 is a simplified block diagram of a control system of an injection molding machine according to one embodiment of the present invention.

FIG. 2 is a plan view of an injection molding machine according to one embodiment of the present invention.

FIG. 3 is an explanatory view showing a test piece as an example of a molded product molded by an injection molding machine according to one embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a graphic display image on a display device of the injection molding machine according to one embodiment of the present invention.

FIG. 5 is an explanatory view showing a graphic display image on a display device of the injection molding machine according to one embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a graphic display image on a display device of the injection molding machine according to one embodiment of the present invention.

FIG. 7 is an explanatory view showing a graphic display image on a display device of the injection molding machine according to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 mold opening / closing mechanism 2 first injection unit 3 second injection unit 4, 5 type internal pressure sensor 6, 7 injection pressure sensor 8 key input device 9 display device 9a display screen 11 microcomputer (microcomputer) 12 sensor group 13 driver group 14 molding condition setting storage unit 15 molding process control unit 16 measured value storage unit 17 display processing unit 18 first injection unit data storage unit 19 second injection unit data storage unit 20 data conversion processing unit 21 display fixed data storage unit 22 display Image data generation unit 30 Molded product (test piece) 31 A-color resin 32 B-color resin 33 Fusion unit 41 Injection pressure of first injection unit 42 Injection pressure of second injection unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/13 B29C 45/76-45/77 B22D 17/32

Claims (5)

(57) [Claims] 1. A plurality of injection units are provided for one mold opening / closing mechanism, and respective injection periods from the plurality of injection units to a cavity of a mold attached to the mold opening / closing mechanism substantially overlap with each other. As described above, in the injection molding machine in which the plurality of injection units perform injection almost simultaneously, the measured data of the injection process of the plurality of injection units is graphically displayed on one display screen along the same time axis. A method for displaying an injection graphic image of an injection molding machine, characterized in that: 2. The injection molding machine according to claim 1, wherein the injection molding machine includes a first injection unit and a second injection unit, and at least the injection pressure data of the first and second injection units are transmitted at the same time. An injection graphic image display method for an injection molding machine, wherein a graphic display is provided on one display screen in such a manner as to be described along an axis. 3. An injection graphic image display of an injection molding machine according to claim 2, wherein the resin pressure data in the mold is graphically displayed following the injection pressure data along the same time axis. Method. 4. The injection molding machine according to claim 1, further comprising a first injection unit and a second injection unit, wherein at least injection stroke data of the first and second injection units are transmitted at the same time. 1 along the axis
An injection graphic image display method for an injection molding machine, wherein a graphic display is provided on two display screens. (5) Multiple injections for one mold opening / closing mechanism
Equipped with an extension unit and attached to the mold opening / closing mechanism
The plurality of injection units for the cavity of the
So that each injection period from the
An injection component in which the plurality of injection units perform injection substantially simultaneously;
In the form machine, The microcomputer built in the injection molding machine
Captures measured data of injection process of multiple injection units
And a plurality of the measured values stored in
Measurement data of the injection process of the injection unit is plotted on the same time axis.
Graphic table on one display screen along with
Display processing unit Injection molding
Form machine.