JP2000006218A - Mold clamping condition monitoring device on molder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a molder, which can decide a set pressure in a low pressure mold clamping process at all times to a proper one by a method wherein an operator can precisely and visually recognize a peak pressure of an actually measured mold clamping pressure in the low pressure mold clamping process. SOLUTION: In a molder, in which a low pressure mold clamping process for detecting whether a foreign matter is present or not on the parting molding surfaces of a mold before the touching of a movable mold 4 with a fixed mold 2 is provided so as to enter a high pressure mold clamping process for generating a predetermined mold clamping force after the low pressure mold clamping process, a pressure detecting means for measuring the mold clamping pressure in the low pressure mold clamping process, a peak pressure detecting means for detecting the peak pressure during the low pressure mold clamping process interval from the actually measured pressure outputted from the above- mentioned pressure detecting means and a displaying processing means for displaying the peak pressure outputted from the peak pressure detecting means on the displaying screen are equipped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for monitoring a mold clamping condition in a molding machine such as an injection molding machine or a die casting machine, and more particularly, to a mold clamping pressure (load pressure) in a low pressure mold clamping process during a mold clamping operation. The present invention relates to a mold clamping condition monitoring device for monitoring.

[0002]

2. Description of the Related Art In a molding machine having a molding die such as an injection molding machine, a high-pressure die for generating a mold clamping force in a state where foreign matter is interposed between a fixed die and a movable die. Tightening can lead to mold damage and poor molding.Therefore, before the high-pressure mold closing process, low-pressure mold clamping is performed to detect whether there is any foreign matter on the mold release surface. Often there is a journey.

[0003] Ideally, the set pressure in the above-described low-pressure mold clamping process for detecting foreign matter is a state in which no foreign matter exists between the fixed mold and the movable mold (normal state). Mold clamping pressure (load pressure) measured during low pressure mold clamping process
It is desirable to set the value to about the same as or slightly higher than the peak value of the above. In this case, the detection accuracy of the foreign matter is increased, and even if the fine foreign matter is present on the mold release surface, the foreign matter The movement of the movable-side mold is prevented by the resistance from.

[0004]

By the way, the mold clamping pressure (load pressure) in the low pressure mold clamping process is different for each mold because the sliding load of the guide pin and the angular pin of the mold differs for each mold. Each time, it is necessary to appropriately determine the set pressure in the low-pressure mold closing stroke.

However, conventionally, there has been no means for detecting the peak value of the mold clamping pressure in the low pressure mold clamping process, and the set pressure in the low pressure mold clamping process has been set to a rough value with a margin. . In order to solve this point,
It has also been attempted that an operator reads a mold clamping pressure during a low-pressure mold closing stroke using an analog pressure meter and determines a set pressure value in the low-pressure mold closing stroke based on the reading. However, it is difficult for an analog pressure meter to accurately read the peak value of the measured mold clamping pressure from the deflection of the pointer, and the set pressure in the low pressure mold clamping process tends to be set to a rough value with a margin. Met.

[0006] The present invention has been made in view of the above points,
The purpose is to make the peak pressure of the actually measured mold clamping pressure during the low-pressure mold clamping stroke accurately visible to the operator, so that the set pressure in the low-pressure mold clamping stroke can be adjusted easily and reliably. It is an object of the present invention to realize a molding machine that can be determined at a time.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention detects whether or not a foreign substance exists on a mold release surface before a movable mold touches a fixed mold. To provide a low-pressure mold clamping process, and after this low-pressure mold clamping process,
In a molding machine adapted to enter a high-pressure mold-clamping stroke for generating a predetermined mold-clamping force, a pressure detecting means for measuring a mold-clamping pressure in a low-pressure mold-clamping stroke; The apparatus includes a peak pressure detecting means for detecting a peak pressure in a mold clamping stroke section, and a display processing means for displaying a peak pressure output by the peak pressure detecting means on a display screen of a display device. Alternatively, before the movable-side mold touches the fixed-side mold, a low-pressure mold-clamping step is provided for detecting whether or not foreign matter is present on the mold release surface, and after this low-pressure mold-clamping step, In a molding machine adapted to enter a high-pressure mold-clamping stroke for generating a predetermined mold-clamping force, a pressure detecting means for measuring a mold-clamping pressure in a low-pressure mold-clamping stroke, and an actually measured pressure output by the pressure detecting means, Display processing means for displaying the data as graph data on the display screen of the display device.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a simplified overall control system and a simplified mold opening / closing mechanism in an injection molding machine according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a fixed die plate;
Is a fixed die mounted on the fixed die plate 1, 3 is a movable die plate, 4 is a movable die mounted on the movable die plate 3, 5 is a toggle link for driving the movable die plate 3 forward and backward. A rotation-linear motion conversion mechanism for driving the crosshead of the toggle link mechanism 5 back and forth; and a mold clamping (mold opening / closing) drive source 7 for transmitting a rotational force to a rotating portion of the rotation-linear motion conversion mechanism 6. It is a barrel electric servomotor.

Reference numeral 11 denotes a microcomputer (system controller) that controls the operation and display of the entire machine (injection molding machine), 12 denotes a sensor group including a large number of sensors provided in each part of the machine, and 13 denotes a sensor group. A driver group including a large number of driver circuits for driving and controlling a large number of drive sources provided in each part of the machine; 14 is a key input device provided on a front portion of the machine; 15 is the key input device For example, a color CRT display disposed adjacent to
This is a display device including a color LCD or the like. The sensor group 13 includes a torque sensor 12a that detects a torque value (that is, a mold clamping pressure (load pressure) corresponding to the torque value) from the drive current value of the electric servomotor 7, and The driver group 13 includes a servo driver circuit 13a that drives and controls the electric servomotor 7.

The microcomputer 11 shown in FIG. 1 controls the entire molding process such as a weighing operation, an injection operation, a mold opening / closing operation, and an eject operation, calculates and stores measured data, determines a non-defective / defective product, and determines an abnormality. Various processes such as calculation / determination processing such as processing, and display control processing of an output image of the display device 15 are executed. The microcomputer 11 includes a ROM in which various I / O interfaces and control programs are stored, and an RA in which various data and flags are read and written.
M, an MPU (microprocessor), etc., and execute various processes by various programs created in advance. In the present embodiment, the molding condition setting storage unit 21, the molding process control unit 22, the actual measurement Value storage unit 2
3. The following description is provided assuming that the display processing unit 24 is provided. Note that the actual measurement value storage unit 23 includes a low speed mold clamping peak pressure detection unit 23a.

Various operating condition values input by the key input device 14 and the like are stored in the molding condition setting storage unit 21 in a rewritable form. The operating condition values include, for example, the tightening force, the relationship between the screw position and the screw rotation speed during the weighing process, the screw retreat speed, and the back pressure, the suck back control condition, the injection speed from the start of injection to the holding pressure switching. Conditions, primary injection pressure conditions, secondary pressure (holding pressure) switching conditions, holding pressure conditions from the time of holding pressure switching to the end of holding pressure, band heater temperature of each part, mold closing (mold closing) stroke (position) And speed control conditions, mold clamping force (pressure), mold opening stroke (position), speed control conditions, pressure, eject control conditions, and the like.

The molding process control unit 22 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 21. The driver group 13 (motor driver , A heater driver, etc.) to control the driving of the corresponding driving source to execute a series of molding steps.

The actually measured value storage section 23 stores all actually measured data of preset monitor items during continuous automatic operation over a predetermined number of consecutive shots. 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.

The low-speed mold clamping peak pressure detecting unit 23a of the measured value storage unit 23 calculates the torque value (mold clamping pressure) from the drive current value of the electric servomotor 7 based on the output value of the torque sensor 12a. The peak pressure of the actually measured mold clamping pressure in a low-speed mold clamping stroke section described later is detected and stored in a predetermined storage area.

The display processing unit 24 includes a key input device 14
, The display image data of the designated display mode is created based on the display image creation / control program created in advance in accordance with the instruction to call the display image in the mode desired by the operator.

That is, when a command for calling a predetermined display image arrives from the operator, the data conversion processing means of the display processing unit 24 stores the data in the molding condition setting storage unit 21 and the measured value storage unit 23 as necessary. Data to be used for displaying the display mode image is extracted from the information, and the data is converted into a form corresponding to the designated 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 image data that has been subjected to line drawing at a predetermined enlargement / reduction ratio, or the designated display mode is a certain display mode. If the image is an operation state setting image of a process, the extracted data is converted into numerical image data. Then, the data generated by the data conversion processing means is taken into the display image data generation means of the display processing unit 24. On the other hand, from the fixed data for many mode images, such as characters, symbols, graphic figures, and ruled line data, which are previously created and stored in the display fixed data storage means of the display processing unit 24, the display mode image is displayed. Data to be used is extracted, taken into the display image data generation means, and combined with the generation processing data of the data conversion processing means as image data for display. As a result, in the display image data generating means, the image data for the designated display mode is created, and this is sent to the display device 15 by a command of the display processing unit 24, and is displayed on the display screen of the display device 15. The image data in the predetermined mode is displayed.

FIG. 2 is a diagram showing an operation example of a mold clamping (mold closing) process in the injection molding machine of the present embodiment. In the example shown in FIG. 2, the mold closing stroke from the mold clamping start position (mold opening completion position) to the mold clamping completion position is changed to a low speed mold clamping stroke →
According to the position of the movable mold 4 (movable die plate 3), the process is divided into four stages so that the process sequentially shifts from a high-speed mold clamping process to a low-pressure mold clamping process to a high-pressure mold clamping process. Has become. The speed and the pressure are set for each of the low-speed mold clamping process, the high-speed mold clamping process, the low-pressure mold clamping process, and the high-pressure mold clamping process. Each stroke is controlled by speed feedback control according to the position. It is executed by controlling the speed of the electric servomotor 7 so as to match the set speed value.

Here, the pressure set value of each of the low-speed mold closing stroke, the high-speed mold closing stroke, the low-pressure mold closing stroke, and the high-pressure mold closing stroke functions as an upper limit regulated value (upper limit regulated torque value). This is to prevent the output of a pressure value (torque value) higher than that in each stroke. Therefore, in the low-pressure mold closing stroke, which is a mold protection section, for detecting whether or not foreign matter exists on the mold release surface, the pressure set value is set to a value sufficiently smaller than the other strokes. You.

In the present embodiment, in the initial setting state after the mold replacement, it is difficult to set the pressure set value of the low-speed mold closing stroke to an appropriate value from the beginning. Is set to a rough and large value. Then, a test operation is performed in this state, and the actual mold clamping pressure (actual driving torque) in the low-speed mold clamping stroke section is detected by the torque sensor 12a, and the torque sensor 12a in the low-speed mold clamping stroke section is detected.
The actual measured torque data from is taken in and stored in the actual measured value storage unit 23, and the low speed mold clamping peak pressure detecting unit 23a detects the peak pressure of the actual measured mold clamping pressure in the low speed mold closing stroke section. Is stored.

In this embodiment, the peak pressure of the actually measured mold clamping pressure in the low-speed mold clamping stroke section detected as described above is displayed in a display image for setting mold opening and closing conditions. FIG. 3 is a diagram showing a display image for setting the mold opening / closing conditions displayed on the display screen of the display device 15.

In the display image for setting the mold opening / closing condition shown in FIG. 3, a setting column 31 for the mold opening / closing control condition and a setting column 32 for the eject control condition are provided. Reference numeral 31 is divided into a setting column 33 for the mold opening control condition and a setting column 34 for the mold closing control condition. Below the setting column 34 of the mold clamping control condition, a display column 35 of the peak pressure of the measured mold clamping pressure in the low-speed mold clamping stroke section is provided. The peak pressure in the stroke section is displayed (in this case, the pressure is indicated in% with respect to the rated torque of the electric servomotor 7).

As described above, the reason that the display column 35 of the peak pressure of the measured mold clamping pressure in the low-speed mold clamping stroke section is provided in the display image for setting the mold opening / closing conditions, the value of the column 35 of the peak pressure display column is changed. This is because the operator can correct the pressure setting value of the low-speed mold-clamping process in the low-speed mold-clamping-process pressure setting column 34a in the mold-clamping control condition setting column 34 on the same display image while checking. . That is, after confirming the peak value of the mold clamping pressure actually measured during the low pressure mold clamping process in a state where no foreign matter exists between the fixed mold and the movable mold (normal state), A value approximately equal to or very slightly higher than the peak pressure displayed in the pressure display column 35 is set in the pressure setting column 34a of the low-speed mold-clamping stroke. Therefore, it is possible to easily and surely set the pressure set value in the low-speed mold clamping process to an appropriate value, thereby improving the foreign matter detection accuracy and preventing the mold from being damaged. Can be avoided.

In the example shown in FIG. 3, a display column 35 for the peak pressure in the low-speed mold closing stroke section is provided in the display image for setting the mold opening and closing conditions. As shown in FIG. 4, a display column 41 of a graph of the measured mold clamping pressure in the low pressure mold clamping stroke may be provided. The display of such graphic data is performed by the display processing unit 24.
It is easily realized by referring to the actually measured torque data (actually measured mold clamping pressure data) in the low-speed mold clamping stroke section stored in the measured value storage unit 23. Then, even when a graph of the measured mold clamping pressure is displayed as shown in FIG. 4, the operator can easily visually recognize the peak pressure,
The pressure set value in the low-speed mold closing stroke can be set to an appropriate value.

In the above-described embodiment, an example is shown in which an electric servomotor is used as a driving source for opening and closing the mold. However, the present invention is also applicable to a configuration in which a hydraulic cylinder is used as a driving source for opening and closing the mold. Needless to say, this is possible.

Further, in the above-described embodiment, the operator corrects the set pressure in the low-speed mold closing stroke section. However, the machine (microcomputer 11) itself may automatically correct the set pressure. Absent.

[0027]

As described above, according to the present invention, the peak pressure of the actually measured mold clamping pressure at the time of the low pressure mold clamping process can be accurately visually recognized by the operator, so that the set pressure in the low pressure mold clamping process can be easily and reliably determined. It can be determined to be appropriate, and therefore, the foreign matter detection accuracy can be increased, and the mold can be prevented from being damaged as much as possible.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a simplified overall control system and a simplified mold opening / closing mechanism in an injection molding machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operation example of a mold clamping (mold closing) step in the injection molding machine according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an example of a display image for setting mold opening and closing conditions in the injection molding machine according to one embodiment of the present invention.

FIG. 4 is an explanatory view showing a graph display example of an actually measured mold clamping pressure in a low pressure mold clamping process, which is displayed in a display image for setting mold opening and closing conditions in the injection molding machine according to one embodiment of the present invention. .

[Explanation of symbols]

Reference Signs List 1 fixed die plate 2 fixed die 3 movable die plate 4 movable die 5 toggle link mechanism 6 rotation-linear motion conversion mechanism 7 electric servo motor 11 microcomputer (system controller) 12 sensor group 12a torque sensor 13 driver group 13a servo Driver circuit 14 Key input device 15 Display device 21 Molding condition setting storage unit 22 Molding process control unit 23 Actual measured value storage unit 23a Low speed mold clamping peak pressure detecting unit 24 Display processing unit 35 Peak pressure display column in low speed mold closing stroke section 41 Display column of graph of actual measured mold clamping pressure in low speed mold clamping stroke section

Claims (5)

[Claims] 1. A low-pressure mold clamping process for detecting whether or not foreign matter exists on a mold releasing surface before the movable mold touches the fixed mold. After the,
In a molding machine adapted to enter a high-pressure mold-clamping process for generating a predetermined mold-clamping force, a pressure detecting means for measuring a mold-clamping pressure in a low-pressure mold-clamping process; A molding method comprising: peak pressure detecting means for detecting a peak pressure in a mold closing stroke section; and display processing means for displaying a peak pressure output by the peak pressure detecting means on a display screen of a display device. Monitoring system for mold clamping conditions. 2. The mold clamping condition monitoring device for a molding machine according to claim 1, wherein the display of the peak pressure is performed in a display image for setting mold opening / closing conditions. 3. A low-pressure mold closing process for detecting whether or not foreign matter exists on a mold releasing surface before the movable-side mold touches the fixed-side mold. After the,
In a molding machine adapted to enter a high-pressure mold-clamping process for generating a predetermined mold-clamping force, a pressure detecting means for measuring a mold-clamping pressure in a low-pressure mold-clamping process, and an actual measurement pressure output by the pressure detecting means, And a display processing means for displaying the data as graph data on a display screen of a display device. 4. The apparatus according to claim 3, wherein the display of the graph data of the actually measured pressure is performed in a display image for setting a mold opening / closing condition. 5. The electric servomotor according to claim 1, wherein an electric servomotor is used as a driving source for opening and closing the mold.
A mold clamping condition monitoring apparatus for a molding machine, wherein the pressure detecting means is a means for detecting a current value of an electric servomotor and calculating a torque value to detect a corresponding measured pressure.