JPH0455050A - Injection control method for die casting machine - Google Patents

Abstract

PURPOSE:To simplify operations and to improve casting quality by reading out the previously stored optimum injection patterns in accordance with inputted set values, automatically setting optimum casting conditions and controlling a hydraulic circuit for driving an injection cylinder in accordance with these casting conditions. CONSTITUTION:The various set values are inputted at the time of starting casting and the previously stored optimum injection pattern data is read out in accordance with the input values. The optimum casting conditions are automatically set after various kinds of computation. The various control sections of the hydraulic circuit for driving the injection cylinder are automatically controlled in accordance with the set optimum casting conditions. The optimum injection pattern data previously stored in accordance with the input values is read out and the optimum casting conditions are set after various kinds of the computation when an operator merely inputs the various set values to be the requirements for determining the optimum casting conditions. Further, the various control sections of the hydraulic circuit are automatically controlled. The operator is necessitated to merely input the various set data in this way. The operations are thus simplified and the casting quality is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection control method for controlling injection of molten metal from a die-casting machine.

(Prior art) Generally, when casting with a die-casting machine,
Optimal casting conditions such as injection speed and casting pressure are determined according to the product to be cast, and the die casting machine is operated under these conditions.

The optimum casting condition is the inner diameter of the injection sleeve.

It is calculated by various calculation formulas from various set values such as the gate cross-sectional area. In order to eliminate the troublesomeness of such calculations, systems have been proposed that automatically perform calculations and display the calculation results on a display (for example, see Japanese Utility Model Application Publication No. 2-11657).

(Problem to be Solved by the Invention) However, in the case of the above-mentioned conventional technology, although casting conditions such as injection speed can be easily calculated, the operator has to actually adjust the die-casting machine according to the obtained casting conditions. It was difficult to operate as it required shaking.

Furthermore, even if the optimum casting conditions are determined, there is a problem that the optimum conditions may vary depending on the operating conditions of the die-casting machine, such as the temperature of the mold or the temperature of the hydraulic oil in the hydraulic circuit that drives the injection cylinder. Ta.

For example, taking the temperature of a mold as an example, it has been empirically proven that if the mold temperature at the start of casting is lower than a predetermined temperature, the flow of hot water in the cavity will be poor, and as a result, the casting defect rate will be high. It is known. Then, when continuous casting begins and the mold temperature falls within a predetermined temperature range, the hot water flow becomes stable and the casting defect rate becomes almost zero. Furthermore, when the mold temperature rises above a predetermined temperature, the hot water circulation becomes excessive, causing flashing and increasing the casting defect rate.

In view of this fact, the current practice is to correct the injection conditions according to the operating conditions of the die-casting machine, such as the mold temperature, based on the operator's experience, in order to reduce the defective rate.

This dependence on the operator's experience and feelings has resulted in poor operability and extremely difficult quality stabilization.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to automatically control the various control parts of a die-casting machine, which had previously been done manually, in accordance with the optimal casting conditions. The object of the present invention is to improve operability by making it possible to perform various tasks.

Another object of the present invention is to stabilize casting quality by automatically correcting casting conditions according to the operating state of a die-casting machine.

(Means for Solving the Problems) In order to achieve the above object, in the injection control method for a die casting machine of the present invention, various setting values are inputted at the start of casting of the die casting machine, and the input values are The optimum injection pattern data stored in advance is read out based on the data, the optimum casting conditions are automatically set after various calculations, and the various control units of the hydraulic circuit that drive the injection cylinder are controlled based on the automatically set optimum casting conditions. Automatically control what is automatically controlled.

Furthermore, it is effective to measure the operating state of the die-casting machine and correct the optimum casting conditions based on the measured values.

Furthermore, it is preferable to automatically control various control parts of the hydraulic circuit of the injection cylinder from the trial casting to the main casting according to the optimum casting conditions. It is preferable to separate the test casting pattern into the main casting pattern and gradually transfer the test casting pattern to the main casting pattern for each predetermined shot.

The main casting process includes a low-speed injection process, a high-speed injection process, and a pressure increase process, and the main casting pattern is divided into a low-speed injection speed and a low-speed injection stroke in the low-speed injection process, a high-speed injection speed and a high-speed injection stroke in the high-speed injection process. , and a combination of the pressure increase pressure and pressure increase rise time in the pressure increase step.

The trial casting pattern includes a first trial casting pattern in which injection is controlled only at a low injection speed in the main casting process, and a second trial casting pattern in which injection is controlled only at a low injection speed in the main casting process, and a second trial casting pattern in which pressure is not increased.
It is desirable to consist of a trial casting pattern and a third trial casting pattern that is controlled in the same way as the main casting pattern.

On the other hand, it is effective to control the various control parts of the hydraulic circuit by automatically controlling the opening degree of the injection speed control valve corresponding to the injection speed and the relationship of the pressure increase rise adjustment valve corresponding to the pressure increase rise time. .

Further, it is preferable that the operating state of the die casting machine to be measured be the temperature of the mold, the temperature of the hydraulic oil in the hydraulic circuit that drives the injection cylinder, or the filling pressure of an accumulator provided in the hydraulic circuit.

(Function) According to the injection control method of the die casting machine having the above configuration,
The operator simply inputs various setting values that serve as specifications for finding the optimal casting conditions, and the optimal injection pattern data stored in advance is read out based on the input values, and after various calculations, the optimal casting conditions are set. Furthermore, various control sections of the hydraulic circuit are automatically controlled.

In addition, it is possible to improve casting quality by correcting the optimal casting conditions according to the operating conditions of the die-casting machine, such as the temperature of the mold, the temperature of the hydraulic oil in the hydraulic circuit, and the filling pressure of the accumulator. can.

Further, if the hydraulic circuit is automatically controlled from trial casting to actual casting under optimal casting conditions, the condition of each part of the die casting machine can be efficiently stabilized.

Furthermore, if the optimum casting conditions are gradually transferred from the trial casting pattern to the main casting pattern, it is possible to smoothly transfer to the main casting process.

(Example) The present invention will be explained below based on illustrated embodiments.

FIG. 3 shows an example of an injection process of a die casting machine to which the injection control method of the present invention is applied.

That is, 5B is an injection sleeve, and the molten metal 3 is supplied into the injection sleeve 5B, and the molten metal 3 is pressed by an injection plunger 4 driven and controlled by a hydraulic circuit, which will be described later, to be injected and filled into the cavity 2 of the mold. , pressure casting is used.

This injection process consists of a low-speed injection process, a high-speed injection process, and a pressure increase process.

In the low-speed injection process, as shown in FIG. 3(a), after filling the injection sleeve 5B with a predetermined amount of molten metal 3,
), injection sleeve 5B at low injection speed VL.
The injection plunger 4 is stroked SL until the space between the inner gate 5C and the injection plunger 4 is filled with the molten metal 3. In this state, the injection pressure P
L is hardly added.

Next, the process moves to a high-speed injection process, and as shown in FIG. 3(C), the injection plunger 4 is pressed by a predetermined stroke Sb at a high-speed injection speed 1 to inject the molten metal 3 into the cavity 2 through the gate 5C. let

In this step, a predetermined injection pressure P1 is applied (see FIG. 4, etc.), and the time during this period becomes the filling time T.

When the high-speed injection process is completed, the pressure increase process begins, as shown in Figure 4 (
As shown in b), the filling pressure is set to an increased pressure P to prevent defects such as cavities from occurring in the cast product.

FIG. 1 is a block diagram of the basic configuration of the injection control method of the present invention. That is, the inner diameter d of the injection sleeve 5B,
Game) A setting value input section 100 for inputting various setting data such as 5C cross-sectional area, and an optimum injection pattern data storage section 101 that stores optimum injection pattern data in advance.
a calculation unit 102 that reads optimal injection pattern data based on the input value and calculates optimal casting conditions;
Based on the optimum casting conditions automatically set by the calculation section 102, various control sections 104 of a hydraulic circuit that drives the injection cylinder, such as an injection speed control valve and a pressure increase rise time adjustment valve, are automatically controlled. Furthermore, a correction section 103 is provided that corrects the optimum casting conditions output from the calculation section 102 according to the operating state of the die-casting machine. The correction section 103 is connected to a measuring means 105 that measures the operating state of the die-casting machine, such as the temperature of the mold, and a correction data storage section 106 that stores various correction data.

Here, the important casting conditions are high injection speed Vk, high injection stroke Sb, low injection speed ■L, low injection stroke SL, pressure increase pressure Pi, pressure rise time T8, etc., and the optimum casting conditions are these. It is set as a pattern that combines data. Optimum values for these casting conditions are theoretically derived from specifications such as the shape of the product to be cast, the inner diameter d of the injection sleeve 5B, and the cross-sectional area of the gate.

The injection speed V, , V of the casting conditions is controlled by an injection speed control valve provided in the hydraulic circuit that drives and controls the injection cylinder 5, and the pressure increase rise time T is controlled by a pressure increase rise time adjustment valve. Ru.

FIG. 5 shows a hydraulic circuit for driving an injection cylinder of a die-casting machine for carrying out the injection control method of the present invention.

Reference numeral 1 denotes a mold, which is configured to inject and fill a cavity 2 with molten metal 3 by pressing it with an injection plunger 4, thereby performing pressure casting.

The injection plunger 4 is attached to a piston rod 5A of a hydraulically operated injection cylinder 5, and molten metal is injected under pressure by operating the injection cylinder 5.

The pressure increase cylinder 6 is located behind the injection cylinder 5 and supplies pressure increase oil to the injection cylinder 5. A position sensor 16 is provided on the side of the injection cylinder 5 to detect the position of the injection plunger 4, and this detects when the injection plunger 4 passes through each preset point. There is.

The injection cylinder 5 is also provided with a pressure sensor 30 for measuring the working oil pressure within the injection cylinder 5.

Reference numeral 9 is an achiemulator connected to a hydraulic power source 1O and filled to a constant pressure.

Reference numeral 11 denotes an injection speed control valve, and a stopper (
15A, 19A) to control the amount of oil from the accumulator 9 and the speed of 4 during the injection plunge.

Stroke setting mechanisms 15 and 19 are provided on both sides of the injection speed control valve 11 to adjust the positions of the stoppers (15A, 19A), and to set the stroke using the pilot piston 12 and the chamber 17 and boat 18. Set the stroke and adjust the opening of valve IIA.
This opening degree is detected by encoders (15B, 1'?B). By adjusting each opening, the speed of the injection plunger 4 is controlled to be low or high, respectively.

Reference numeral 13 denotes a pressure increase check valve, which prevents backflow since the pressure in the injection cylinder 5 becomes higher than the pressure in the first hydraulic circuit 7 during the pressure increase process. A pilot piston 14 controls opening and closing of a valve 13A in the pressure increase check valve 13.

Reference numeral 24 is a pressure increase rise time adjustment valve that adjusts the pressure increase rise time after completion of filling. The opening degree of the pressure increase rise time adjustment valve 24 is set by the electric motor 28 a and the stroke setting mechanism 28 , and this opening degree is detected by the encoder 29 .

The pressure sensor 30 is connected to a controller 31 via an A/D converter 39, and a detection signal is input to the controller 31.

7.8 are injection speed control valve 11 and pressure increase check valve 1, respectively.
3. They are a first hydraulic circuit and a second hydraulic circuit that connect the pressure increase cylinder 6 and the pressure increase rise time adjustment valve 24. 22.23 is the first
This is a sequence valve that operates at a pressure slightly lower than the maximum pressure of the hydraulic circuit 7. 21 and 27 are solenoid valves for switching oil paths. 20, 25, and 26 are pilot hydraulic lines, respectively.

FIG. 6 is a schematic diagram illustrating microcomputer control regarding injection control. That is, the controller 31 includes an input port 31a into which various data are input, central processing units CP and U that perform predetermined calculations based on the input data, and an output port that outputs a predetermined signal according to the result of the calculation. 31b, and storage devices ROM and RAM that store optimal injection pattern data and the like in advance.

Detection signals and various setting data from various sensors that measure the operating state of the die-casting machine are input to this input port 31a. In this embodiment, in addition to the pressure sensor 30 and the position sensor 16, the various sensors include a temperature sensor 41 that measures the temperature of the mold, a pressure sensor 42 that measures the filling pressure of the accumulator, and a pressure sensor 42 that measures the temperature of the hydraulic oil. An oil temperature sensor 43 is used, each of which is converted into a digital signal through an A/D converter 44 and connected to the input port 31a. Further, various setting data are inputted from a setting input device 33.

FIG. 7 is an enlarged view of the mounting part of the temperature sensor on the surface of the mold 1, and shows a non-through hole 41a into which the temperature sensor 41 is inserted, leaving the mold 1 surface and the thickness C in the gate part 5c of the mold 1. A temperature sensor 41 such as a thermocouple is installed inside the hole 41a to measure the temperature at the bottom of the hole 41a. As the temperature sensor 41, it is possible to use a sensor using a thermofiber as a radiation thermometer.

Furthermore, the controller 31 is equipped with a display device such as a CRT! 50 and an alarm device 51 may be connected to the display device 50, which can output optimal casting condition data and correction data that are arithmetic-processed and automatically set by the controller 31.

Next, the injection control method for a die casting machine according to the present invention will be explained in detail along the flowchart shown in FIG.

First, the inner diameter of the injection sleeve (d), the gate cross-sectional area (a),
Specifications for determining optimal casting conditions in main casting/continuous casting cycles, such as accumulator filling pressure (Pace) and accumulator filling pressure (Pace)
Input (STEPI).

More specifically, the injection sleeve inner diameter (d), injection sleeve length (ri), hot water supply amount (W), gate cross-sectional area (a), product wall thickness (t), product weight (W), accumulator filling pressure (
P, C, ), etc., and determine the optimum casting conditions through the following calculations.

1) Empirical formula for determining the filling time T, % Formula % (11) is a constant, α is a correction value related to the product shape, both are empirical values, and the optimum value is selected from the optimum injection pattern data.

2) High-speed injection speed Vl a ■k ””zd”・V, ・・・・・・・・・・・・
...(2) a: Gate cross-sectional area d: Injection sleeve inner diameter ■,: Gate speed (see Figure 3, select the optimum value from the optimum injection pattern data at the flow rate of the molten metal passing through the gate 5c) W: Product weight (Figure 3 (see C1, weight excluding biscuits) Tf: Filling time: Specific gravity of molten metal ρ 3) Low speed injection stroke 5L SL=ffi (1-ψ) ・・・・・・・・・・・・・
...(4) l is the length of the injection sleeve (Fig. 3 (a)
Reference) ψ is the sleeve filling rate and the volume of the injection sleeve (-7
- Ratio of hot water supply amount (W/ρ) to dt・2) 4) High-speed injection stroke S.

(w=, d"・Sl・ρ) 5) Low injection speed ■.

Select the optimum value from the optimum injection pattern data.

As described above, low injection speed (vL), high injection speed (V
k) Determine the low speed injection stroke (SL) and high speed injection stroke (Sb) (STEP 2).

Next, determine the injection pressure cover turn according to FIG. 4(b), where P is the pressure increase pressure, Pt=Pac ~2.7).

T in FIG. 4 is the pressure increase rise time, and the optimum value is selected from the optimum injection pattern data.

T3 is adjusted by controlling the opening degree of the pressure increase rise time adjustment valve.

The optimum casting conditions are determined by the above.

Here, the optimum casting conditions are conditions for a series of operations during injection plunge, and are information obtained by combining each condition data into a pattern. The test casting pattern is divided into a test casting pattern in the test casting process and a main casting pattern in the main casting process, and the test casting pattern is gradually transferred to the main casting pattern for each predetermined shot.

As explained at the beginning of this example, this casting process includes a low-speed injection process, a high-speed injection process, and a pressure increase process. High-speed injection speed h and high-speed injection stroke S1 in the high-speed injection process In addition, the increased pressure P and increased pressure rise time T in the increased pressure process
, is set as patterned information by combining the data of .

On the other hand, the test casting pattern is a stepwise transition to the main casting pattern for each shot, and in this example, as will be explained below, Second. The third test casting pattern is gradually transferred to the main casting pattern over three stages.

Once the optimum casting conditions are determined, the opening degree of the injection speed control valve 11 and the opening degree of the pressure increase rise time adjustment valve 24 are automatically set as shown in the flowchart (STEP 3).

For this automatic setting, the oil temperature and the filling pressure P acc of the accumulator 9 are measured, and the opening degree of the injection speed control valve 11 is
■From 1, the opening degree of the pressure increase rise time adjustment valve 24 is T,
It is initialized by

Therefore, trial casting is started (STEP 4).

Trial casting is performed under trial casting conditions called a trial casting pattern.

Since the mold 1 is cold during trial casting, the trial casting pattern is executed until the mold temperature rises to an appropriate temperature, and then main casting is continued.

Examples of the test casting patterns are shown in Figures 8 (a), (b), and (C), and the first test casting pattern of several shots from the first shot was a low injection speed ■1 and a low injection pressure. P.L.
Advance the entire injection stroke with and do not increase pressure.

The second test casting pattern for several shots from the next Nth round is as follows:
Low injection speed (1), low injection stroke SL, high injection speed (2) execute high injection stroke S1, and do not increase pressure.

In the third trial casting pattern from the next shot, the same conditions as the main casting are performed by adding pressure increase to the above conditions.

In the trial casting, the oil temperature etc. are measured by the oil temperature sensor 43 etc., and the injection speed control valve 11 and the pressure increase rise time adjustment valve 2 are
Execute the opening degree correction in step 4.

Also in main casting and continuous casting, the oil temperature is measured from time to time, and the opening degree of the injection speed control valve 11 and the opening degree of the pressure increase rise time adjustment valve 24 are corrected.

In addition, the temperature t of the mold 1 is measured, and corrections such as gate speed (2) are performed based on the optimum injection pattern data to correct the optimum injection conditions.

In other words, when the mold temperature T is low, the solidification time is short, so the gate speed (2) is set high to increase the filling time T.

, and mold temperature 1. If Tf is high, the solidification time will be prolonged, so the filling time Tf is increased to correct the optimum injection conditions.

Further, the opening degrees of the injection speed control valve 11 and the pressure increase rise time adjustment valve 24 can also be corrected in response to changes in the accumulator filling pressure pace.

Each correction of the above casting conditions will be explained in detail below.The mold 1 surface temperature t immediately before injection (for example, the gate part
c), and if the temperature is lower than a predetermined temperature, the opening degree of the injection speed control valve 11 is corrected to increase the high-speed injection speed Vw, and if the temperature is within the predetermined temperature range, the high-speed injection speed Vk is returned to the standard value. , when the temperature is higher than a predetermined temperature, the opening degree of the high-speed injection speed control valve 11 is corrected so as to decrease the high-speed injection speed vk.

The opening degree correction of the injection speed control valve 11 with respect to the mold temperature t is performed using the correction coefficient η of the high-speed injection speed ■1 with respect to the mold temperature LD.
The correction coefficient η is not corrected at 1.0 when the mold temperature t is within a predetermined temperature range, and when the mold temperature t is te+ below the predetermined temperature range. For example, η-1,25 indicates that the high-speed injection speed (1) is increased by 25%.

When the mold temperature t is low, correction is made to shorten the filling time Tf by increasing the high-speed injection speed v1.

Also, when tD3 is higher than a predetermined temperature, for example, η-〇, 7
5 indicates that the high-speed injection speed (■) is reduced by 25%.

The data of the correction coefficient η shown in FIG. 9 is stored in the storage unit ROM, etc., and η·■1, which is obtained by multiplying the high-speed injection speed ■ calculated in step 5TEP2 of the flowchart by the correction coefficient η, is determined as the high-speed injection speed v1. do. All that is left to do is to control the opening degree of the injection speed control valve 11 described above.

Regarding the opening degree correction of the pressure increase rise time adjustment valve 24, if the mold surface temperature measured value t is lower than the predetermined temperature, the opening degree of the pressure increase rise time adjustment valve 24 is increased to adjust the pressure increase rise time T. , and when the temperature is within the predetermined temperature range, the opening degree of the pressure increase rise time adjustment valve 24 is returned to the standard value to set the pressure increase rise time T.

is set as a standard value, and when the temperature is higher than a predetermined temperature, the opening degree of the pressure increase rise time adjustment valve 24 is decreased and the pressure increase rise time T is automatically corrected to increase. Although the correction of the pressure increase rise time adjustment valve 24 is not shown in the drawings, it is assumed that correction coefficients as shown in FIG. 9 are stored in the ROM of the storage unit or the like.

The opening degree correction of the injection speed control valve 11 corresponding to oil temperature changes is as follows:
In advance, a test is conducted to create a relationship curve between the high injection speed (■) and the ME of the encoder representing the opening degree of the injection speed control valve 11 when the oil temperature is used as a parameter, as shown in FIG. 10.゜High injection speed at 40.50℃■
, and the opening degree E of the injection speed control valve is created and this data is stored in the storage unit ROM or the like.

Then, the data shown in FIG. 10 is read out from the storage device ROM based on the oil temperature data manually input to the input boat 31a from the oil temperature sensor 43 through the A/D converter 44, and the injection speed control valve 11 is adjusted in accordance with the oil temperature change. The opening degree E is output from the output port 31b. Then, the opening degree control motor M of the injection speed control valve 11 is driven through the amplifier, and since the opening degree E is fed back by the encoder EN, injection is performed when it matches the opening degree E of the output from the output capo 31b. The opening degree control of the speed control valve 11 is completed.

Next, the correction of the relationship of the injection speed control valve 11 to the accumulator pressure p acc is performed by changing the curve of FIG.
5,145 kgf/d, store the data in the ROM of the storage device, input it from the pressure sensor 42 to the input device 31a through the A/D converter 44, and calculate the data for the accumulator pressure P ice. Memory department! The opening degree of the injection speed control valve 11 is controlled by reading data from the ROM.

The relationship correction corresponding to the oil temperature change of the pressure increase time adjustment valve 24 is made by testing the relationship curve between the encoder value of the opening degree of the adjustment valve 24 and the pressure increase rise time T at that time, as shown in Fig. 11. The opening control motor 28a may be controlled as in the case of the injection speed control valve 11 after the data is created and stored in advance in a storage device ROM or the like.

In the above embodiment, the injection speed control valve 11 was used as a control valve for the opening stopper mechanisms 15A and 19A having the opening control motor 15 and the opening encoder E, but the invention is not limited to this (as a servo valve) Alternatively, the spool position of the servo valve may be detected by a linear encoder such as a differential transformer.

(Effects of the Invention) The present invention has the above-described configuration and operation, and reads pre-stored optimal injection pattern data to automatically set the injection control conditions of the die-casting machine and automatically control various control units of the injection cylinder. Since the control is controlled in a consistent manner, the operator only needs to input various setting data, which simplifies the operation and improves casting quality.

Furthermore, if the optimum casting conditions are corrected in accordance with the operating conditions of the die-casting machine, such as the temperature of the mold, the control conditions can further stabilize the casting quality.

Further, by controlling the test casting to the actual casting using automatically set control conditions, each part of the die casting machine can be efficiently stabilized, and the defective rate can be reduced.

Furthermore, by shifting the @ control conditions stepwise from the test casting pattern to the main casting pattern, each part of the die casting machine can be efficiently stabilized.

[Brief explanation of drawings]

FIG. 1 is a basic control block diagram of the control method for a die-casting machine of the present invention, FIG. 2 is a control flowchart of the present invention, and FIG. A schematic cross-sectional view, FIG. 4(a) is an injection speed diagram of the main casting process, FIG. 5 is an injection pressure diagram of the main casting process, and FIG. FIG. 6 is a control block diagram showing the control configuration of the injection cylinder controller shown in FIG. 5, and FIG. 7 is a diagram showing an example of the mold temperature sensor shown in FIG. 6. 8(a) to CCI are diagrams showing the injection pattern in the test casting process, FIG. 9 is a graph showing the relationship between mold temperature and correction coefficient, and FIG. 10 is a graph showing the relationship between high injection speed and valve opening. FIG. 11 is a graph showing the relationship between pressure increase rise time and valve opening degree using oil temperature as a parameter. Explanation of symbols 1... Mold 2... Cavity 3...
・Molten metal 4...Injection plunger 5...
Injection cylinder 5A... Piston rond 5B...
- Injection sleeve 5C... Gate 6... Pressure booster cylinder 7... First hydraulic circuit 8... Second hydraulic circuit 9... Accumulator 11... Injection speed control valve 15.19... Stroke setting mechanism 15A, 19A... Stopper 24... Pressure increase rise time adjustment valve 28... Stroke setting mechanism 29... Encoder 41... Temperature sensor 42
...Pressure sensor 43...Oil temperature sensor Figure 4 Figure Gold! ! Tan IK (Me) Ikken Bo (ENl 11th Figure 1■ (EN)

Claims (10)

[Claims] (1) When starting casting of the die-casting machine, input various setting values, read out the optimal injection pattern stored in advance based on the input values, automatically set the optimal casting conditions, and automatically set the optimal injection pattern. An injection control method for a die casting machine, comprising automatically controlling various control parts of a hydraulic circuit that drives an injection cylinder based on casting conditions. (2) The injection control method for a die-casting machine according to claim 1, wherein the operating state of the die-casting machine is measured, and the optimum casting conditions are corrected based on the measured value. (3) The injection control method for a die-casting machine according to claim 1 or 2, wherein various control sections of the hydraulic circuit of the injection cylinder are automatically controlled from trial casting to main casting according to the optimum casting conditions. (4) The optimum casting conditions are divided into a test casting pattern in the test casting process and a main casting pattern in the main casting process, and the test casting pattern is gradually transferred to the main casting pattern for each predetermined shot. 3. The injection control method for a die casting machine according to 2 or 3. (5) This casting process has a constant speed injection process, a high speed injection process, and a pressure increase process, and this casting pattern is divided into a low injection speed and low speed injection stroke in the low speed injection process, and a high injection speed and high speed in the high speed injection process. 5. The injection control method for a die-casting machine according to claim 4, wherein the injection stroke, and the optimum injection pattern data of the pressure increase and pressure rise time in the pressure increase process are combined. (6) The test casting pattern includes a first test casting pattern in which injection is controlled only at a low injection speed in the main casting process, and a second test casting pattern that includes a low speed injection process and a high speed injection process in the main casting process and does not increase pressure. The injection control method for a die-casting machine according to claim 5, comprising: a trial casting pattern; and a third trial casting pattern that is controlled in the same manner as the main casting pattern. (7) The various control units of the hydraulic circuit automatically control the opening degree of the injection speed control valve corresponding to the injection speed and the opening degree of the pressure increase rise adjustment valve corresponding to the pressure increase rise time.
7. The injection control method for a die casting machine according to 2, 3, 4, 5 or 6. (8) The injection control method for a die casting machine according to claim 2, 3, 4, 5, 6 or 7, wherein the operating state of the die casting machine to be measured is the temperature of the mold. (9) The injection control method for a die casting machine according to claim 2, 3, 4, 5, 6, or 7, wherein the operating state of the die casting machine to be measured is the temperature of hydraulic oil in a hydraulic circuit that drives the injection cylinder. (10) Injection of a die casting machine according to claim 2, 3, 4, 5, 6, or 7, wherein the operating state of the die casting machine to be measured is the filling pressure of an accumulator provided in a hydraulic circuit that drives an injection cylinder. Control method.