JPH0497815A - Apparatus for setting molding condition pattern - Google Patents

Abstract

PURPOSE:To reduce the deviation of a molding condition pattern with the response of an injection molding machine and to stabilize the quality of a molded product by setting the molding condition pattern as the continuous function intended by an operator. CONSTITUTION:An injection speed pattern generator 16 generates the speed set value which corresponds to the position of a screw corresponding to a screw position detection value to apply the same to a screw speed controller 15. The screw speed controller 15 controls the opening degree of a servo valve 14 corresponding to the deviation of a speed detection value and the speed set value to drive the screw 13. A dwell pattern set value is applied to the injection speed pattern generator 16 from a molding machine controller 17. The injection speed pattern generator 16 applies a dwell set value to the screw speed controller 15 on the basis of the dwell pattern set value. The screw speed controller 15 controls the opening degree of the servo valve 14 on the basis of the dwell set value to apply advance driving force to the screw 13. By this method, a molding condition pattern can be corrected corresponding to the quality of a molded product.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding condition pattern setting device for setting a molding condition pattern in a counter-pressure molding machine.

(Prior Art) Generally, an injection molding machine executes an injection molding cycle based on a preset molding condition pattern.

The second injection molding cycle consists of a molten resin measuring process, a molten resin injection process, a pressure holding process, etc. Conventionally, when setting a molding pattern, each process is divided into multiple sections.
Setting values are determined for each section, and these setting values are used as a molding condition pattern. In other words, set values are determined for each of a finite number of set points, and an injection molding cycle is executed using these set values as a molding condition pattern.

(Problem to be solved by the invention) By the way, conventionally, when setting a molding condition pattern,
As mentioned above, each process is divided into multiple sections, set values are determined for each section, and these set values are used as the molding condition pattern, so the molding condition pattern does not change continuously between sections. Therefore, the molding condition pattern changes step by step).

On the other hand, when setting up an injection molding machine, there is the issue of whether or not it is desirable to be able to input the pattern that the operator intends, and that if input is done at discrete points as in the past, there is no choice but to increase the number of points, making the settings complicated. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a molding condition pattern setting device that allows an operator to freely create a desired pattern manually.

(Means for Solving the Problems) According to the present invention, in an injection molding machine that executes an injection molding cycle based on a preset molding condition pattern, a setting means for setting the molding condition pattern as a continuous function; A molding condition pattern setting device is obtained, comprising: storage means for storing the continuous function as a setting value table; and display means for displaying the continuous function as a display pattern.

(Operation) In the present invention, a molding condition pattern is set as a continuous function by the setting means, and this continuous function is stored in the storage means as a set value table.

In this way, by setting the molding condition pattern as a continuous function intended by the operator, the injection molding cycle is controlled based on the set value table, so it is possible to operate with the optimal pattern, and as a result, the molding condition The deviation between the pattern and the response of the injection molding machine can be reduced, and the quality of the molded product is stabilized.

Furthermore, by displaying the molding condition pattern as a display pattern, the molding condition pattern can be easily corrected.

(Example) The present invention will be explained below with reference to Examples.

First, referring to FIG. 1, an injection molding machine to which the present invention is applied includes a mold 11 and an injection cylinder 12.
A screw 13 is arranged in the injection cylinder 12 so as to be rotatable and movable forward and backward.

The injection molding cycle includes a metering process, an injection process, a pressure holding process, etc. First, in the metering process, the resin material is supplied from the hopper 12a into the injection cylinder 12 by the rotational drive of the screw 13, where it is melted. and becomes molten resin.

When the metering process is completed, hydraulic pressure is supplied to the injection cylinder 12 via the servo valve 14, thereby driving the screw 13 forward and injecting the molten resin into the mold 11 (injection process). Thereafter, in a pressure holding step, the molten resin is held at a predetermined pressure within the mold 11 and molded into a molded product.

By the way, for example, in the injection process, the screw 13
The position of is measured by a position sensor (not shown);
It is sent as eight screw position detection values. Further, the forward speed of the screw 13 is measured by a speed sensor (not shown) and sent as a speed detection value. Then, as will be described later, the drive of the screw 13 is controlled according to these screw position detection values and speed detection values.

As shown, a screw speed controller 15 is connected to the servo valve 14, and an injection speed pattern generator 16 is connected to the screw speed controller 15. and,
The injection speed pattern generator 16 is connected to the molding machine controller 1
7 as described below.

As shown in the figure, the molding machine controller 17 is connected to a CRT 18 on which various information is displayed, as well as a coordinate input device 19.

Here, referring also to FIG. 2, when setting the molding condition pattern, the molding condition pattern is continuously entered manually using the coordinate input device 19.

Two-dimensional coordinates are displayed on the screen on the coordinate input device 19. When setting the speed pattern, the horizontal axis (X-axis) represents the screw position, and the vertical axis (y-axis) represents the screw speed. On the other hand, when setting the pressure cover turn, the horizontal axis represents time and the vertical axis represents holding force.

For example, a so-called touch panel is attached to the screen one screen above the coordinate input device, and the pressure on the touch panel is detected by continuously tracing the two-dimensional coordinates with a finger or the like.
The signal is input to the molding machine cositroller 17 as a continuous signal. That is, a pattern continuously traced on the touch panel is given to the molding machine controller 17 as a continuous function V-f(r) (where ■ represents the screw speed and r represents the screw position). Such a function f(r) may be obtained by an existing interpolation method or a function approximation method, or may be stored as a value divided by a sufficiently fine width Δr of r. Then, the molding machine controller 17 stores this continuous function (hereinafter referred to as continuous pattern) in a built-in memory (not shown).

For example, in the injection process, the above-described continuous pattern is used as an injection pattern setting value, and an injection pattern setting value corresponding to the screw position is provided to the injection speed pattern generator 16 in accordance with the detected screw position value.

The injection speed pattern generator 16 generates a speed setting value corresponding to the screw position according to the screw position detection value, and supplies this speed setting value to the screw speed controller 15. The screw speed controller 15 controls the opening degree of the servo valve 14 according to the deviation between the detected speed value and the speed set value, and drives the screw 13 at a forward speed corresponding to the speed set value.

In this way, since the injection process is controlled based on the continuous pattern, there will be no deviation from the response of the injection molding machine.

Similarly, during the pressure holding process, by continuously tracing the two-dimensional coordinates with a finger, etc., the Yasuda pattern or continuous function P
−f(t) (where P represents the holding force and t represents the time) to the molding machine controller 17. Then, the molding machine controller 17 stores this pressure holding pattern in a built-in memory (not shown).

From then on, the pressure holding process is executed based on this storage pressure pattern. That is, the holding pressure pattern setting value is given to the injection speed pattern generator 16 from the molding machine controller 17, and the elbow speed pattern generator 16 sets the holding pressure setting value to the screw speed controller 15 based on this holding pressure pattern setting value.
give to Then, the screw speed controller 15 controls the opening degree of the servo valve 14 based on the holding pressure setting value, and provides forward driving force to the screw 13.

As described above, when a molded product is injection molded, the molding condition pattern can be modified depending on the quality of the molded product. That is, as shown in FIG. 2, the molding condition pattern in the previous injection molding cycle (hereinafter referred to as the previous molding condition pattern) is displayed on the screen of the coordinate input device 19, and the molding is performed by referring to this previous molding condition pattern. Condition patterns can be easily modified.

In the above-described embodiments, the coordinate input device 19 is equipped with a touch panel, or the molding condition pattern may be continuously input using a light pen or the like.

(Effects of the Invention) As explained above, in the present invention, the molding condition pattern is set as a continuous function pattern, and the injection molding cycle is executed based on this continuous pattern. This has the effect of reducing the deviation in response and easily stabilizing the quality of the molded product.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of an injection molding machine equipped with a molding condition pattern setting device according to the present invention, and FIG. 2 is a diagram for explaining the setting of molding condition patterns. ] 1. Mold, 12. Injection cylinder 13.. Screw ] 4. Servo valve, 15.. Screw speed controller, 16. Injection speed pattern generator, 17. Molding machine controller 18.. CR'T , 19・Coordinate input device.

Claims (1)

[Claims] 1. In an injection molding machine that executes an injection molding cycle based on a preset molding condition pattern, a setting means for setting the molding condition pattern as a continuous function, and a setting value table that sets the continuous function. 1. A molding condition pattern setting device comprising: storage means for storing molding condition patterns. 2. In the molding condition pattern described in claim 1,
A molding condition pattern setting device comprising a display means for displaying the continuous function as a display pattern.