JPH05177682A - Controller for molding machine - Google Patents

Abstract

PURPOSE:To judge simply stability of a resin filling process by providing a control device wherein a plurality of physical quantities of operation are continuously detected through a detecting means detecting the physical quantities of operation and products of a plurality of physical quantities of operation are continuously obtd. through an operational means and the results of operation are displayed graphically on a displaying means. CONSTITUTION:A control device 20 detects continuously loading pressure and resin filling speed through a loading pressure detecting means 16 and a filling speed detecting means and operates continuously the energy quantities of a resin through an operational means 20 and displays graphically the operational results on a displaying means 22. Only a graph illustrating change in an energy quantity of the resin can be displayed as a graph illustrating the change on the displaying means 22. Therefore, as an operator can evaluate stability of a molding process by watching only the graph of the energy quantity of the resin, it is possible to judge quickly and accurately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine controller, and more particularly to a molding machine controller that displays data indicating the stability of a molding process in a molding machine.

[0002]

2. Description of the Related Art For example, in an injection molding machine, a method is known in which quality control of a molded product is carried out by monitoring the molding process, particularly by monitoring the stability of the resin filling process. This is because if the resin filling step is performed stably, the amount of resin used and the like will also be stable, and as a result, the quality of the molded product will be stable. Conventionally, the method used in the injection molding machine is to detect the change in the speed of the injection screw and the change in the resin pressure in the resin filling step independently and display them as separate graphs on the display. There is also an apparatus in which a reference value is graphically displayed at the same time in order to determine the detected speed or pressure so that an operator can monitor the deviation amount of the speed or pressure with respect to the reference value.

[0003]

However, monitoring the stability of the resin filling process of the conventional molding machine described above has the following problems. Since the change of the injection screw speed and the change of the resin pressure in the resin filling process are displayed on the display as separate graphs, there is a problem that the operator who performs monitoring has to make a judgment for both graphs, which is troublesome. Therefore, it is an object of the present invention to provide a controller of a molding machine that can judge the stability of a resin filling process very easily.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, a movement physical quantity detection means for detecting a plurality of movement physical quantities in a molding process of a molding machine, a calculation means for obtaining a product of the plurality of detected movement physical quantities, and a change of a product of the plurality of movement physical quantities. A display means capable of displaying a graph, and continuously detecting the plurality of operation physical quantities via the operation physical quantity detection means, and continuously obtaining the product of the plurality of operation physical quantities via the arithmetic means, And a control means for displaying the calculation result as a graph on the display means.

Specifically, the operating physical quantity detecting means is
A load pressure detecting means for detecting a load pressure of the molding machine, and a filling speed detecting means for detecting a resin filling speed of the molding machine, wherein the operating physical quantity is the detected load pressure and resin filling speed. Is. Further, the operating physical quantity detection means, load pressure detection means for detecting the load pressure of the molding machine, filling speed detection means for detecting the resin filling speed of the molding machine, the temperature of the resin to be filled It is a resin temperature detecting means for detecting, and the operating physical quantity may be the detected load pressure, resin filling speed and resin temperature. Further, in the controller of the molding machine having the above-mentioned configuration, a reference graph of the product of the operating physical quantity and / or data indicating an allowable range of the product of the operating physical quantity, which is a reference of stability evaluation of a predetermined molding process, is stored. Is provided, and the control means is
The product of the current motion physical quantity obtained by the calculation and the reference graph of the product of the motion physical quantity and / or the allowable range of the product of the motion physical quantity may be displayed together on the display means as a graph.

[0006]

[Operation] The operation will be described. The control means continuously detects a plurality of movement physical quantities in the molding process through the movement physical quantity detection means, continuously obtains the product of the plurality of movement physical quantities through the calculation means, and displays the calculation result on the display means. Since the graph is displayed, only the graph showing the change of the product of one operating physical quantity can be displayed on the display means as the graph showing the change. In particular, a storage unit storing a reference graph of the product of the operating physical quantity and / or data indicating an allowable range of the product of the operating physical quantity, which serves as a reference for stability evaluation of a predetermined molding process, is provided, and the control is performed. The means is
When the product of the current motion physical quantity obtained by the calculation and the reference graph of the product of the motion physical quantity and / or the allowable range of the product of the motion physical quantity are displayed together on the display means, the molding process is immediately performed. It is possible to judge the stability evaluation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In this embodiment, a controller of an injection molding machine, which is an example of a molding machine, will be described as an example. In the block diagram of FIG. 1, reference numeral 12 denotes an injection molding machine, in which an injection screw for filling a resin into a molding die is arranged in a heating cylinder (not shown) and driven by a hydraulic actuator. When the injection screw is driven,
The resin in a molten state in the heating cylinder can be injected and filled into the molding die. Reference numeral 14 denotes a screw position sensor which constitutes a filling speed detecting means which is an example of an operating physical quantity detecting means, and is capable of detecting the position on the stroke of the injection screw. For example, a potentiometer is used as the screw position sensor. The speed of the injection screw, which can be regarded as the resin filling speed (operational physical quantity) of the injection molding machine 12, is calculated by the microprocessor described later.

Reference numeral 16 is a pressure sensor which is an example of load pressure detecting means (an example of operating physical quantity detecting means), which is regarded as the load pressure (operating physical quantity) of the injection molding machine and is the hydraulic pressure of a hydraulic actuator for driving the injection screw. To measure.
The load pressure (physical operation amount) may be the resin pressure in the heating cylinder or the resin pressure in the molding die, in addition to the hydraulic pressure of this embodiment. Also, the injection screw 12
When driving a motor with an electric motor, for example, the load of the motor may be found from the motor current, and the load pressure may be found by calculation or a data table search based on the load. The air pressure of can be used as the load pressure. Reference numeral 18 is an input unit, for example, a keyboard is used. From the input unit 18, control data, control commands and the like necessary for controlling the injection molding machine 12 can be input. In addition to the keyboard, the input means may be an input means operated by an operator such as a touch panel, an external memory such as an IC card, or online.

Reference numeral 20 denotes a microprocessor (MPU) having the functions of an arithmetic means and a control means. The arithmetic means includes a resin filling speed calculated by the present position of the injection screw detected by the screw position sensor 14 and a resin filling speed. , The product (product of operating physical quantity) with the resin pressure (load pressure) detected by the pressure sensor 16 is calculated. In the following description, the product of the operating physical quantity is referred to as “resin energy quantity” for convenience.
Further, the MPU 20 as a control means continuously detects the resin pressure via the pressure sensor 16 and the resin filling speed based on the current position of the injection screw obtained by the screw position sensor 14, and at the same time determines the resin energy amount. It is calculated continuously, and the result of the calculation is graphically displayed on the display means described later. When displaying the graph, the MPU 20 stores, from a storage unit described later, a reference graph of a resin energy amount and / or an allowable range of the resin energy amount, which serves as a reference for stability evaluation of a predetermined resin filling process. Is displayed, and the current resin energy amount obtained by the calculation, the reference graph of the read resin energy amount, and / or the permissible range of the resin energy amount are displayed together on the display means. In addition, the MPU 20 controls each part of the injection molding machine 12 according to the control program.

A color CRT 22 is an example of display means.
It is a display, which graphically displays changes in the amount of resin energy that the MPU 20 sequentially calculated in the molding process. In addition, a predetermined reference graph of resin energy amount and (/
Or) Read out the data showing the allowable range of the resin energy amount, and display the present resin energy amount obtained by the calculation and the read-out reference graph of the resin energy amount and / or the allowable range of the resin energy amount in a graph. .. Further, the display 22 can display control parameters, commands, operating conditions of the injection molding machine, information processed by the MPU 20, and the like input from the keyboard 18. As the display means, in addition to the display 22,
A graphic printer may be used to output a graph on recording paper.

An example of the display mode of the display 22 will be described with reference to FIG. In the screen of FIG. 2, the horizontal axis represents the position of the injection screw (or the elapsed time associated with the movement of the injection screw), and the position (or time) at which the resin filling process proceeds as it goes to the left. On the other hand, the vertical axis represents the amount of resin energy. A solid line graph G1 is a reference graph of the resin energy amount which is a reference for stability evaluation in the resin filling process. A broken line graph G2 is a graph showing the upper limit of the allowable range of the resin energy amount which is the reference of the stability evaluation. A broken line graph G3 is a graph showing the lower limit of the permissible range of the resin energy amount which is the standard of the stability evaluation. Solid line graph G
4 is a graph showing changes in the actual resin energy amount that the MPU 20 sequentially calculated.

Referring again to FIG. 1, reference numeral 24 is a RAM,
The current position of the injection screw detected by the screw position sensor 14 is sequentially stored. The resin filling speed calculated by the MPU 20 based on the current position of the injection screw stored in the RAM 24 is also sequentially stored. The resin pressure measured by the pressure sensor 16 is also sequentially stored. When a data table is used to obtain the load pressure, the necessary data table is also stored in the RAM 24. Furthermore, MP
The current resin energy amount calculated by U20 is also sequentially stored. The MPU is also stored in the RAM 24 via the input unit 18.
The various data input to 20, the information processed by the MPU 20, the calculation result, and the like are temporarily stored. RAM2
4, an external memory such as an IC card can be used. In particular, when the data table is stored, it can be rewritten by using an external memory and the data can be easily updated.

Reference numeral 26 is a ROM which is an example of a storage means, and a reference graph of resin energy and / or a reference graph of resin energy which is a reference for stability evaluation of a resin filling process which is determined in advance.
Control data indicating an allowable range of resin energy is stored. Further, the ROM 26 stores an operating system of the MPU 20, a control program for displaying the amount of resin energy in a graph, data, and the like in advance. An external memory such as an IC card may be used for the control program and control data.

When the controller 10 having the above-mentioned configuration displays the change in the resin energy amount in the molding process in a graph, for example, the operator determines the stability of the molding by reading the deviation amount of the graph G4 from the reference graph G1 in FIG. can do. Also, the graph G
If No. 4 does not deviate from the permissible range indicated by the graphs G2 and / or G3, it is determined to be within the permissible fluctuation range, and the molded product is also determined to be non-defective. On the other hand, if the graph G4 deviates from the permissible range indicated by the graphs G2 and / or G3, it is judged to be outside the permissible fluctuation range, and the molded product is judged to be defective. The operator determines the non-defective product and the defective product, but the MPU 20 can also perform the data comparison calculation. In that case, the MPU 20 activates an alarm (not shown) to notify the operator if the defective product is determined, The injection molding machine 12 selects a defective product as a defective product by a sorting device that sorts the molded product into a good product and a defective product, and in some cases, the injection molding machine 12 is stopped. In the present embodiment, the stability of the molding process (resin filling process) can be determined by a single amount of resin energy amount, so that the operator can easily make the determination in a short time.

Although the resin energy amount is expressed by the product of the load pressure and the resin filling speed in the above-mentioned embodiment, the resin energy amount is expressed by the product of the three operating physical quantities of the load pressure, the resin filling speed and the resin temperature. You can also In that case, the controller 10 of the above embodiment is provided with a resin temperature detecting means (example: temperature sensor) for detecting the temperature of the resin to be filled (operating physical quantity) as an operating physical quantity detecting means, and MP
U20 calculates the product of the load pressure, the resin filling speed, and the resin temperature calculated as the calculation means to calculate the resin energy amount. Further, the MPU 20 continuously detects the load pressure, the resin filling speed, and the resin temperature as control means, and
The amount of resin energy is continuously obtained, and the calculation result is graphically displayed on the display 22. When the resin energy amount is expressed as the product of the load pressure, the resin filling speed, and the resin temperature, the stability of the molding process can be expressed with high precision because of the large number of calculation elements compared with the resin energy amount in the above-described embodiment. In the above description, the product of the operating physical quantity is described as a combination of "load pressure-resin filling speed" and "load pressure-resin filling speed-resin temperature".
"Resin filling speed-resin temperature", "load pressure-resin temperature"
It is also possible to combine the above, etc., and it is possible to further add other operating physical quantities. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, a molding machine is not limited to an injection molding machine, and a compression molding machine or an injection compression machine is used. Needless to say, many modifications can be made without departing from the spirit of the invention, such as the use in a molding machine, a transfer molding machine, or the like.

[0016]

When the controller of the molding machine according to the present invention is used, the control means controls the load pressure, the resin filling speed (and the resin temperature) via the load pressure detecting means, the filling speed detecting means (and the resin temperature detecting means). ) Is continuously detected, and the amount of resin energy is continuously obtained through the calculating means,
Since the calculation result is displayed as a graph on the display means, only one graph showing the change of the resin energy amount can be displayed on the display means as a graph showing the change. Therefore, the operator can evaluate the stability of the molding process only by looking at the graph of the resin energy amount, and can make a quick and accurate determination. Particularly, when the configuration of claim 3 is adopted, the obtained resin energy amount and the reference graph of the resin energy amount and /
Alternatively, since it is graphically displayed on the display means together with the allowable range of the amount of resin energy, it is possible to judge the molding state and whether or not the molded product has a predetermined quality.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a controller of a molding machine according to the present invention.

FIG. 2 is an explanatory diagram showing a screen of a display that displays a resin energy amount as a graph.

[Explanation of symbols]

 10 Controller 12 Injection Molding Machine 14 Screw Position Sensor 16 Pressure Sensor 18 Input Section 20 MPU 22 Display 24 RAM 26 ROM

Claims (4)

[Claims] 1. A motion physical quantity detection means for detecting a plurality of motion physical quantities in a molding process of a molding machine, a calculation means for obtaining a product of the detected plurality of motion physical quantities, and a plurality of motion physical quantities of the plurality of motion physical quantities. Display means capable of displaying a change in the product as a graph, and continuously detecting the plurality of operation physical quantities through the operation physical quantity detection and output means, and continuously calculating the product of the plurality of operation physical quantities through the arithmetic means. And a control means for graphically displaying the calculation result on the display means. 2. The operation physical quantity detection means is a load pressure detection means for detecting a load pressure of the molding machine and a filling speed detection means for detecting a resin filling speed of the molding machine. The controller of the molding machine according to claim 1, wherein is the detected load pressure and resin filling speed. 3. The operation physical quantity detecting means, a load pressure detecting means for detecting a load pressure of the molding machine, a filling speed detecting means for detecting a resin filling speed of the molding machine, and a resin to be filled. 2. The controller for a molding machine according to claim 1, wherein the controller is a resin temperature detecting means for detecting the temperature of, and the operating physical quantity is the detected load pressure, resin filling speed, and resin temperature. 4. A storage means is provided for storing a reference graph of the product of the operating physical quantity and / or data indicating an allowable range of the product of the operating physical quantity, which serves as a reference for stability evaluation of a predetermined molding process. The control means displays a graph on the display means together with the product of the current motion physical quantity obtained by calculation and the reference graph of the product of the motion physical quantity and / or the allowable range of the product of the motion physical quantity. The controller of the molding machine according to claim 1, 2 or 3.