JPH0740409A - How to set injection conditions for injection molding machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an injection condition setting method in which injection conditions can be set easily and reliably in an injection molding machine in which a combination mode of hydraulic actuator operation can be selected using an injection cylinder and an ACC. [Configuration] The system controller automatically determines one of the combination modes of the hydraulic actuator operation based on the injection resin pressure input by the operator, calculates and sets the hydraulic pressure setting value from the input injection resin pressure, and then In addition, after confirming that the injection speed input by the operator is less than or equal to the maximum speed specified in the combination mode of hydraulic actuator operation determined above, calculate the oil speed setting value from the input injection speed. Set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting an injection condition of an injection molding machine, and more specifically, an injection hydraulic cylinder (hereinafter referred to as an "injection hydraulic cylinder") which is always operated by selecting either a normal speed operation mode or a high speed operation mode. , An injection cylinder) and an operation of a plurality of accumulators (hereinafter referred to as ACCs) that are selectively pressure-increased, which are combined as appropriate, to provide a hydraulic actuator (injection cylinder and ACC).
The present invention relates to an injection condition setting method in an injection molding machine in which a combination of an injection speed condition range and an injection pressure condition range can be variably set by selecting an operation combination mode.

[0002]

2. Description of the Related Art In order to enable a wide range of molding conditions to be set with one machine (injection molding machine), a plurality of injection cylinders are mounted on one machine (for example, a plurality of injection cylinders are arranged in a straight line). Or arranging a plurality of injection cylinders symmetrically side by side) and selecting the combination of injection cylinders to be used according to the required molding conditions to set the injection speed condition and injection pressure condition to the predetermined ones. Such an injection molding machine is being developed recently. However, in such an injection molding machine equipped with a plurality of injection cylinders,
Since the piston rod of each injection cylinder must move forward and backward together with the screw,
If an injection cylinder that is not used (pressure oil is not supplied during the injection stroke) is set, this unused injection cylinder will also move idly, causing a problem that sliding resistance increases and energy loss is large. There is a problem that the pressure cannot be switched during the injection, and it is not possible to simultaneously satisfy both the low pressure and high speed of the filling process and the high pressure of the pressure holding process. Furthermore, when a plurality of injection cylinders are mounted, the shape of the machine becomes complicated and the machine becomes large.

Therefore, the applicant of the present application filed Japanese Patent Application No. 4-338.
No. 841, a normal speed operation mode in which only the oil from the hydraulic pump is sent to the forward oil chamber and a high speed operation mode in which the oil from the hydraulic pump and the oil from the reverse oil chamber are both sent to the forward oil chamber. However, it is possible to supply oil selectively with an injection cylinder composed of a selectable differential pressure cylinder, and in the state where oil is supplied, the boosting operation is performed by the driving force of the injection cylinder, and the pressure is increased. Two types of ACCs having different boosting capacities for supplying oil to the forward oil chamber of the injection cylinder are provided, and whether or not each ACC is to be boosted is individually selected, and the injection cylinder is set to the normal speed operation mode. By selecting either the high speed operation mode or the high speed operation mode, one of eight combination modes (8 steps) of the hydraulic actuator operation is selected. The combination of the force condition range proposed an injection molding machine can be variably set. According to the above-mentioned prior application having such a configuration, the setting condition range of the injection speed and the injection pressure can be widened, the unnecessary sliding load is small, and the pressure can be switched during the injection. It can be a compact mechanism.

[0004]

By the way, in the above-mentioned prior application, no consideration is given to simplifying the injection condition setting method. There was a problem of this. That is, in the past, the operator set the injection pressure (filling pressure),
The setting of the injection speed (filling speed) and the setting of the combination mode of the hydraulic actuator operation have to be carried out independently, which makes the setting of the injection condition a troublesome work. Also,
Since the injection pressure (filling pressure) was set not by the injection resin pressure (filling resin pressure) but by the hydraulic pressure value, it is necessary to convert the injection resin pressure to the oil pressure. The work was complicated and time consuming. Furthermore, in all of the above-mentioned 8 kinds (8 steps) of combination modes, the injection speed (filling speed) is set at 0 to 100% as shown in FIG. Since the absolute value of the actual speed is different when the mode is different, it is necessary to make a conversion in advance so as to be associated with the injection rate. In this respect also, setting the injection condition is a troublesome work.

The present invention has been made in view of the above points,
The object of the invention is to provide an easy-to-use injection condition setting method in which injection conditions can be set easily and reliably in an injection molding machine having a configuration in which a combination mode of hydraulic actuator operation can be selected using an injection cylinder and an ACC. To do.

[0006]

In order to achieve the above-mentioned object, the present invention is provided in a heating cylinder, a screw for injecting and filling a mold with molten resin by a forward movement, and a forward oil chamber. The normal speed operation mode, in which only the oil from the hydraulic pump is sent, and the high speed operation mode, in which the oil from the hydraulic pump and the oil from the reverse oil chamber are both sent to the forward oil chamber, are selectable. An injection cylinder consisting of a pressure cylinder, a moving block that is connected to the piston rod of the injection cylinder, is connected to the rear end of the screw, and moves forward and backward integrally with the screw, and is capable of supplying oil selectively, When oil is supplied, boosting operation is performed via the moving block that moves forward by the driving force of the injection cylinder, and this boosted oil is supplied to the forward oil chamber of the injection cylinder. Multiple of ACC having different that boosting ability
And a hydraulic actuator by individually selecting whether or not to boost the plurality of ACCs, and by selecting whether the injection cylinder is in a normal speed operation mode or a high speed operation mode. In the injection condition setting method of the injection molding machine, in which the combination of the injection speed condition range and the injection pressure condition range can be variably set by selecting the operation combination mode, in the injection molding machine system controller, the injection controller set by the operator Based on the resin pressure, the optimum combination mode is automatically determined from the combination modes of the hydraulic actuator operation, and the hydraulic pressure set value is calculated and set from the input injection resin pressure.
After confirming that the injection speed input by the operator is less than or equal to the maximum speed specified in the combination mode of hydraulic actuator operation determined above, calculate and set the oil speed setting value from the input injection speed. , Is constructed.

[0007]

The system controller, when the injection resin pressure is input and set by the operator, according to a predetermined combination mode determination program, the determination injection resin pressure value specified for each combination mode of the hydraulic actuator operations, Performs a comparison with the input injection resin pressure value,
Switching control for each hydraulic actuator (injection cylinder, ACC) that determines the combination mode that satisfies the input injection resin pressure and has the minimum judgment resin pressure value, and determines the combination mode for hydraulic actuator operation The valve switching combination mode is stored. Further, the system controller converts and calculates the hydraulic pressure value from the input injection resin pressure and stores the hydraulic pressure set value. Next, when the operator inputs and sets the injection speed in the form of an absolute value having a relationship corresponding to the injection rate, the system controller causes the input injection speed to be set in the combination mode of the hydraulic actuator operations determined above. If it is judged NO in this judgment process, the re-input setting is prompted, and if YES is judged, the oil speed is changed from the input injection speed. The flow rate setting value is calculated and stored. By doing so, the injection conditions can be set very easily and reliably.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a main part of an injection device of an injection molding machine according to this embodiment, and FIG. 2 is a front view of a main part of the injection device of an injection molding machine according to this embodiment.

In FIGS. 1 and 2, 1 is a holding block which is fixedly arranged during a continuous molding operation, 2 is a heating cylinder whose base end side is held by the holding block 1, and 3 is the heating cylinder 2. A nozzle mounted on the tip side, 4 is a screw arranged so as to be able to rotate and move forward and backward in the heating cylinder 2, and 5 is a raw material resin on the base end side (the rear end side of the screw 4) of the heating cylinder 2. It is a hopper for charging and supplying.

Reference numeral 6 denotes a screw rotation driving motor (electric motor or hydraulic motor) which is connected to the rear end side of the screw 4 via a rotation connecting member 7, and is used during the kneading / plasticizing / measuring process. The rotation drives the screw 4 to rotate. Reference numeral 8 denotes a moving block that holds the rotary connecting member 7 rotatably via bearings, and moves forward and backward together with the screw 4 and the motor 6.

Reference numeral 9 denotes an injection cylinder (hydraulic cylinder) which is a drive source for injection, and in the present embodiment, a pair is provided symmetrically with respect to the screw 4 when viewed in plan.
The two injection cylinders 9 have the same structure. The injection cylinder 9 is a double rod type differential pressure cylinder, and includes a forward oil chamber 10 and a reverse oil chamber 11
There is a difference in the effective cross-sectional area of the piston body in the backward movement oil chamber 11 in FIGS. 12 is a double rod type piston rod of the injection cylinder 9 (hereinafter referred to as piston rod 12
Is referred to as "), and the tip side of the rod portion on the small diameter side of the piston rod 12 (advancing oil chamber 10 side) is the moving block 8.
Is attached to. Therefore, when the piston rod 12 of the injection cylinder 9 moves forward and backward, the moving block 8 also moves forward and backward together with this.

Reference numeral 13 is an ACC (A) (accumulator (A)), and 14 is an ACC (B) (accumulator (B)). In this embodiment, one pair is provided for each injection cylinder 9. There is. The ACC (A) 13 is provided with a boosting piston rod 13b capable of moving forward and backward in the ACC chamber 13a, and one end side of the boosting piston rod 13b projects outward from the ACC chamber 13a and moves as described above. It faces the block 8. Also, ACC
(B) 14 is also provided with a boosting piston rod 14b capable of moving back and forth in the ACC chamber 14a, and one end side of this boosting piston rod 14b also projects outward from the ACC chamber 14a and the moving block. 8 is facing. The ACC (A) 13, (B) used in the present invention
14 is different from a general ACC that pressurizes oil with a high-pressure gas or a spring to discharge and store the accumulated oil.
Alternatively, when the oil is supplied to 14a, the pressure-increasing piston rod 13b or 14b is pushed by the moving block 8 and moves forward (leftward in the drawing) to pressurize and discharge the oil, as described later. ing. In this embodiment, the boosting capability of the accumulator (B) is set larger than the boosting capability of the accumulator (A) 13.

FIG. 3 shows the injection cylinder 9 and the ACC.
1 shows a configuration of a main part of a hydraulic circuit including (A) 13 and (B) 14 (a hydraulic circuit of only one side of a pair of injection cylinders 9 is shown). In FIG. 3, 21 is a switching control valve for forward control of the piston rod 12 of the injection cylinder 9, and the neutral position is selected in the figure, but by switching the switching control valve 21 to the left position in the figure, The oil from the hydraulic pump 26 is fed into the advancing oil chamber 10 of the injection cylinder 9 via the speed / pressure variable control valve system 25. Reference numeral 22 denotes a switching control valve for differential pressure operation control, which is arranged in a pipe line between the reverse oil chamber 11 and the forward oil chamber 10 of the injection cylinder 9, and the neutral position is selected in the figure. However, by switching the switching control valve 22 to the left position in the drawing, the forward oil chamber 10 and the reverse oil chamber 11 are connected to each other, and the oil is moved from the reverse oil chamber 11 to the forward oil chamber 10. Is able to flow. The switching control valve 22 is used for the known kneading / plasticizing / measuring process (the charging process) in which the screw 4 is retracted by the stored molten resin pressure, and the injection differential pressure of the injection cylinder 9 described later. During operation (high speed operation), the forward oil chamber 1
0 and the reverse oil chamber 11 are switched to the illustrated left position (at least at this time, the forward oil chamber 10 and the reverse oil chamber 11 are filled with oil).

Reference numeral 23 is a switching control valve for the ACC (A) 13, and the neutral position is selected in FIG.
By switching the switching control valve 23 to the right position in the figure,
Oil from the hydraulic pump 26 is replenished in the ACC chamber 13a of the ACC (A) 13, and the boosting piston rod 13b projects toward the moving block 8 side. Also, by switching the switching control valve 23 to the left position in the figure, the ACC chamber 13
Oil is returned from a to the tank. Furthermore, ACC room 1
When the switching control valve 23 is switched to the neutral position and the injection stroke is executed in a state in which 3a is filled with oil, the boosting piston rod 13b moves forward by the moving block 8 that moves forward integrally with the piston rod 12 of the injection cylinder 9. do it,
The pressure of the oil in the ACC chamber 13a is increased, whereby the pressurized oil in the ACC chamber 13a is sent to the advancing oil chamber 10 of the injection cylinder 9.

Reference numeral 24 is a switching control valve for the ACC (B) 14, and the neutral position is selected in FIG.
By switching the switching control valve 24 to the right position in the figure, the oil from the hydraulic pump 26 is transferred to the AC of the ACC (B) 14.
It is replenished to the C chamber 14a, and the boosting piston rod 14
b projects toward the moving block 8 side. Further, by switching the switching control valve 24 to the left position in the drawing, oil is returned from the ACC chamber 14a to the tank. Furthermore, ACC
When the switching control valve 24 is switched to the neutral position and the injection stroke is executed in a state where the chamber 14a is filled with oil, the moving block 8 that moves forward integrally with the piston rod 12 of the injection cylinder 9 causes the boosting piston rod 14b to move. By moving forward, the pressure of the oil in the ACC chamber 14a is increased, which causes the AC
The pressurized oil in the C chamber 14a is sent to the advancing oil chamber 10 of the injection cylinder 9.

Reference numeral 27 is a system controller mainly composed of a microcomputer which controls the entire injection molding machine. In response to a command from the system controller 27,
The switching combination state of the switching control valves 21, 22, 23, 24 is selected via the valve drivers 28, 29, 30, 31. That is, ACC (A) 13 and A
Individually selecting whether to boost the CC (B) 14 and selecting whether the injection cylinder 9 is in the normal speed operation mode or the injection differential pressure operation (high speed operation) mode. The system controller 27 selects and controls the combined mode of the hydraulic actuator operation. In FIG. 3, reference numeral 25 is a speed / pressure variable control valve system which is controlled via the valve driver 32 by a command from the system controller 27, which is shown in a simplified manner in the drawing, but is set by the system controller 27. It is controlled by pressure and set speed.

Next, the operation of the above configuration will be described with reference to FIGS. 4 to correspond to the columns in FIG. 5 and to the graph in FIG. 6, respectively.

In FIG. 4, ACC (A) 13, (B) 1
4 is not used, only the injection cylinder 9 is operated at normal speed operation (that is, the forward movement oil chamber 10 and the backward movement oil chamber 11 of the injection cylinder 9 are not communicated with each other, but are cut off, The operation state in which oil is sent to the oil chamber 10 is shown. In the operation mode of FIG. 4, the injection cylinder 9
The piston rod 12 moves forward by the force of the pressure oil sent from the hydraulic pump 26 to the forward oil chamber 10, and has the highest injection pressure (highest resin pressure) although it is the lowest speed in the operation mode of the present embodiment. ) Is realized. The operation mode of FIG. 4 is hereinafter referred to as a hydraulic actuator operation combination mode.
In the column of FIG. 5, the range of the injection resin pressure and the range of the injection rate (the index of the absolute velocity value represented by the injection resin amount per unit time) that can be realized in this combination mode are shown (this is , In the following combination modes ~, the same applies to the columns in Fig. 5). Further, in the column of FIG. 5, the determination injection resin pressure value P _C1 used in the determination processing of the combination mode by the system controller 27 to be described later is also described (in the following combination modes, FIG. The same applies to the judgment injection resin pressure values P _{C2 to} P _{C7 in the} columns. On the other hand, in the graph of FIG. 6, the hatched region to the right shows the range of injection resin pressure and the range of injection rate that can be realized in the combination mode. It should be noted that the numerical values here are shown as an example for a machine of a certain specific model, and the numerical values will naturally differ if the machine model is different.

In FIG. 4, the ACC (A) 13 is used,
The state where the injection cylinder 9 is operated at the normal speed operation is shown. In this case, as the piston rod 12 of the injection cylinder 9 moves forward, the boosting piston rod 13b of the ACC (A) 13 moves forward by the moving block 8 and AC
The oil in the ACC chamber 13a of the C (A) 13 is pressurized, so that the oil in the ACC chamber 13a is added to the oil from the hydraulic pump 26 to advance the oil chamber 1 of the injection cylinder 9.
It is sent to 0. Therefore, since the oil in the ACC chamber 13a is sent to the advancing oil chamber 10 by the propulsive force of the piston rod 12 of the injection cylinder 9, as shown in the column of FIG. 5, the injection rate is higher than that in the combination mode (of FIG. 4). Is increased (injection speed can be increased), and the maximum value of injection resin pressure is decreased. The operation mode of FIG. 4 is hereinafter referred to as a hydraulic actuator operation combination mode. Further, in the graph of FIG. 6, a hatched region to the left shows a range of injection resin pressure and a range of injection rate that can be realized in the combination mode.

In FIG. 4, the ACC (B) 14 is used,
The state where the injection cylinder 9 is operated at the normal speed operation is shown. In this case, as the piston rod 12 of the injection cylinder 9 moves forward, the boosting piston rod 14b of the ACC (B) 14 moves forward by the moving block 8 and the AC
The oil in the ACC chamber 14a of the C (B) 14 is pressurized, whereby the oil in the ACC chamber 14a is added to the oil from the hydraulic pump 26, and the oil chamber 1 for advancing the injection cylinder 9 is formed.
It is sent to 0. The ability of this ACC (B) 14 is A
Since it is higher than the capacity of CC (A) 13, the maximum value of the injection rate becomes larger and the maximum value of the injection resin pressure becomes smaller than in the combination mode (of FIG. 4), as shown in the column of FIG.
The operation mode of FIG. 4 is hereinafter referred to as a hydraulic actuator operation combination mode. Note that, in the graph of FIG. 6, the range of the injection resin pressure and the range of the injection rate that can be realized in this combination mode are not shown by hatching, but those skilled in the art will appreciate that the range is represented by a rectangular area as described above. Is obvious (this also applies to each region of FIG. 6 in the following combination modes ~).

In FIG. 4, ACC (A) 13 and ACC
(B) 14 is used and the injection cylinder 9 is operated at the normal speed operation. In this case, as the piston rod 12 of the injection cylinder 9 advances, the ACC
(A) 13 boost piston rod 13b and ACC
(B) The pressurizing piston rod 14b of 14 is moved forward by the moving block 8 to pressurize the oil in the ACC chamber 13a and the ACC chamber 14a, whereby the ACC chamber 13a,
The oil in 14a is sent to the forward oil chamber 10 of the injection cylinder 9 in a form of being added to the oil from the hydraulic pump 26. Therefore, since the oil in the ACC chambers 13a and 14a is sent to the advancing oil chamber 10 by the propulsive force of the piston rod 12 of the injection cylinder 9, as shown in the column of FIG.
The maximum value of the injection rate becomes larger and the maximum value of the injection resin pressure becomes smaller than in the combination mode (in FIG. 4). This Figure 4
Hereinafter, the operation mode of is referred to as a combination mode of hydraulic actuator operation.

In FIG. 4, ACC (A) 13, (B) 1
4 is not used and only the injection cylinder 9 is operated at high speed operation (differential pressure operation) (that is, the forward movement oil chamber 10 and the reverse movement oil chamber 11 of the injection cylinder 9 are communicated with each other, and An operating state in which a pressure circuit is formed is shown. In the operation mode of FIG. 4, the piston rod 12 of the injection cylinder 9 receives the forward force by the force of the pressure oil directly sent from the hydraulic pump 26 to the forward oil chamber 10 and the forward oil chamber 1
0 and the reverse oil chamber 11 depending on the difference in cross-sectional area between the reverse oil chamber 1 and the reverse oil chamber 1
The advancing force by the oil discharged from No. 1 and sent to the advancing oil chamber 10 via the differential pressure circuit (regeneration circuit) is also received. Therefore, naturally, the maximum value of the injection rate becomes larger and the maximum value of the injection resin pressure becomes smaller than that in the combination mode.
In the present embodiment, in the case of the operation mode of FIG. 4, as shown in the column of FIG. 5, the maximum value of the injection rate is larger than that of the combination mode (of FIG. 4), and the maximum value of the injection resin pressure is It is configured to be small. Hereinafter, the operation mode of FIG. 4 is referred to as a combination mode of hydraulic actuator operation.

In FIG. 4, ACC (A) 13 is used,
It shows a state in which the injection cylinder 9 is operated at high speed (differential pressure operation). In this case, the above-mentioned differential pressure operation of the injection cylinder 9 and ACC (A) in the case of FIG.
As shown in the column of FIG. 5, the maximum value of the injection rate is larger and the maximum value of the injection resin pressure is smaller than that of the combination mode (of FIG. 4). The operation mode of FIG. 4 is hereinafter referred to as a hydraulic actuator operation combination mode.

FIG. 4 shows the accumulator (B) 14
Is used to operate the injection cylinder 9 at high speed (differential pressure operation). In this case, the differential pressure operation of the injection cylinder 9 and the ACC in the case of FIG.
(B) The operation of 14 is combined, and as shown in the column of FIG. 5, the maximum value of the injection rate is larger and the maximum value of the injection resin pressure is smaller than that in the combination mode (of FIG. 4). . The operation mode of FIG. 4 is hereinafter referred to as a hydraulic actuator operation combination mode.

In FIG. 4, ACC (A) 13 and ACC
(B) 14 is used and the injection cylinder 9 is operated at high speed (differential pressure operation). In this case, the differential pressure operation of the injection cylinder 9 and the operation of the accumulators (A) 13 and (B) 14 of FIG. 4 are combined, and as shown in the column of FIG. The maximum value of the injection rate is larger and the maximum value of the injection resin pressure is smaller than that of (in FIG. 4) (in the present embodiment, the maximum value of the injection rate is the largest and the maximum value of the injection resin pressure is the smallest). Become). The operation mode of FIG. 4 is hereinafter referred to as a hydraulic actuator operation combination mode.

As described above, in this embodiment, two kinds of A
By combining the selection of using one or two CC (A) 13, (B) 14 or not using them at all and the selection of the normal speed operation mode and the high speed operation mode of the injection cylinder 9 described above, It is possible to select and set a combination mode (8) of hydraulic actuator operation in eight stages, whereby eight injection speed condition ranges and eight injection pressure condition ranges can be set according to the application.
By doing so, the ACC not used
(A) 13 or (B) 14 is in a state where the mechanical contact with the moving block 8 that is driven forward by the injection cylinder 9 is cut (the edge is cut), so the sliding load is reduced as much as possible. It is possible to suppress energy loss. Also,
Since the injection cylinder 9 is constantly operating in the injection stroke,
By relieving oil from the ACC chambers 13a and 14a to the tank during the injection, for example, switching from low pressure to high pressure can be easily performed. Since the ACC of this embodiment can be made relatively small and simple as compared with the conventional configuration in which a large number of injection cylinders are mounted, the entire machine can be made relatively compact.

Next, the system controller 27 described above.
The processing operation for setting the injection condition according to step 1 will be described with reference to the flowchart of FIG.

When setting the injection conditions, the operator first inputs and sets the injection resin pressure value P (step ST in FIG. 7).
1), the system controller 27 determines the injection resin pressure values P _{C1 to} P _C1 for determination defined for each of the combination modes shown in FIG. 5 in accordance with a predetermined (hydraulic actuator operation) combination mode determination program.
_C7 is compared with the input injection resin pressure value P to determine and determine one combination mode from the above-mentioned combination modes (step ST2). That is, in step ST2, the system controller 27 first compares the determination injection resin pressure value P _C1 having the largest value among the determination injection resin pressure values with the input injection resin pressure value P,
If P ≧ P _C1 , select and decide the combination mode,
If P ≧ P _{C1 is} not satisfied, the next largest injection resin pressure value for determination P _C2 is compared with the input injection resin pressure value P to obtain P
If ≧ P _C2 , select and decide the combination mode, then P
If ≧ P _{C2 is} not satisfied, the determination process of comparing the injection resin pressure value P _C3 having the next largest value with the input injection resin pressure value P will be described below. The process is repeated up to the value P _{C7 as} necessary. If P ≧ P _C7 , the combination mode is selected and determined, and if P ≧ P _{C7, the} combination mode is selected and determined.

When one of the combination modes (1) to (3) is selected and determined in step ST2, the system controller 27 causes the switching combination states of the above-mentioned switching control valves 21 to 24 according to the determined combination mode. To
The data is stored in a predetermined storage area (step ST3). Also,
The system controller 27 sets P ₀ = P / (mode in order to set the injection resin pressure value P input by the operator as the command output value (pressure command value) P ₀ to the speed / pressure variable control valve system 25. Then, the calculated command output value (pressure command value) P ₀ is stored in a predetermined storage area (step ST4). The above mode decompression rate is expressed by (mode decompression rate) = (determined combination mode maximum injection resin pressure value) / (combination mode maximum injection resin pressure value P _C1 ).

Next, the operator inputs the injection speed V (%) in the form of an absolute value having a relationship corresponding to the injection rate (step ST5). The right side of FIG. 8 shows the speed setting range expressed by the absolute value% input by the operator in the present embodiment (present invention), and the speed setting range expressed by the absolute value input is the actual speed range. They are supposed to be the same. As described above, in the present embodiment, the injection speed V (%) is instructed by an absolute value, as compared with the conventional one in which the speed is input at all relative speeds of 0 to 100%. Therefore, the speed instruction can be performed in a simple form that is intuitively easy to grasp, and conversion work is not required when inputting the speed instruction. The speed set value input by the operator may be the injection rate.

When the operator inputs the injection speed V (%) as an absolute value, the system controller 2
Reference numeral 7 is a process for determining whether the input injection velocity V is equal to or lower than the maximum velocity V _C (allowed) defined in the combination mode determined in step ST2 (determination whether V ≦ V _C). Processing) in step ST6, and
If NO is determined in step 6, the fact that the injection speed V input in step ST7 is out of the allowable range is displayed on a display device (not shown), the input of the injection speed V is prompted again, and the process returns to step ST5. On the other hand, if YES is determined in step ST6, the system controller 27 determines that the input injection speed V is appropriate in the determined combination mode, and the system controller 27 determines the injection speed value V input by the operator as In order to set the command output value (speed command value) V ₀ to the speed / pressure variable control valve system 25, V ₀ = V /
(Mode acceleration rate) is calculated, and the obtained command output value (speed command value) V ₀ is stored in a predetermined storage area (step ST8). In addition, the above mode acceleration rate is
(Mode acceleration rate) = (maximum speed of determined combination mode) / (maximum speed of combination mode)

When the setting of the injection condition is completed and the operation start of the machine is instructed by the processing flow described above, the system controller 27 controls the operation operation at the time of injection according to the stored condition data.

As described in detail above, in this embodiment, the system determines the optimum combination mode by first inputting and setting the injection resin pressure P, and then by inputting the injection speed V, this is appropriate. In this case, the work of setting the injection condition is completed, so that the work of setting the injection condition can be performed very easily in a short time. Further, since the system automatically converts the injection resin pressure P into the hydraulic pressure, the condition setting becomes easy in this respect as well. Furthermore, since the injection speed V is input and instructed by an absolute value, the speed can be instructed in a simple form that is easy to grasp, and in this respect also, the condition setting is easy. Become.

The present invention has been described above with reference to the illustrated embodiments, but it goes without saying that various modifications can be made by those skilled in the art without departing from the spirit of the present invention.
If three or more ACCs are attached to the injection cylinder, the injection speed condition range and the injection pressure condition range can be selected and set more finely. Further, when the system controller determines the optimum combination mode by the input setting of the injection resin pressure, the capability (range of pressure and speed) in the determined combination mode is numerically displayed on the display device or as shown in FIG. It may be displayed in the form of the area in.

[0035]

As described above, according to the present invention, for example, two ACCs having different boosting capacities are attached to an injection cylinder and one or two ACCs are used, or no ACC is used at all. By combining the above selection with the selection of the normal speed operation mode and the high speed operation mode of the injection cylinder described above, it is possible to select eight combinations of hydraulic actuator operation modes, and an extremely wide range of injection conditions can be set. In the machine, setting the injection conditions does not burden the operator, and in particular, the optimum combination mode can be determined easily and reliably so that the injection speed range can be automatically maximized for the required injection resin pressure. , The usability is greatly improved.

[Brief description of drawings]

FIG. 1 is a fragmentary plan view of an injection device of an injection molding machine according to an embodiment of the present invention.

FIG. 2 is a fragmentary front view of an injection device of an injection molding machine according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a main part hydraulic circuit and a system controller used in an injection device of an injection molding machine according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing eight types of operation modes (combination modes of hydraulic actuator operation) realized by one embodiment of the present invention.

5 is an explanatory diagram showing the relationship between the combination of the operations of the injection cylinder and the two ACCs, the injection resin pressure, and the injection rate, which correspond to the combination mode of the operations of the hydraulic actuators of FIG.

6 is an explanatory diagram showing a range of an injection resin pressure and a range of an injection rate corresponding to each combination mode of the hydraulic actuator operations of FIG. 4 in the form of a graph.

FIG. 7 is an explanatory diagram showing a processing flow executed by the system controller according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a relationship between a speed setting range input by an operator and an actual speed range corresponding to the speed setting range input by an operator in the related art and the present invention.

[Explanation of symbols]

 2 Heating Cylinder 4 Screw 8 Moving Block 9 Injection Cylinder 10 Forward Oil Chamber 11 Backward Oil Chamber 12 Piston Rod 13 Accumulator (A) (ACC (A)) 13a Accumulator (ACC) Chamber 13b Boosting Piston Rod 14 Accumulator (B) ) (ACC (B)) 14a Accumulator (ACC) chamber 14b Boosting piston rod 21, 22, 23, 24 Switching control valve 25 Speed / pressure variable control valve system 26 Hydraulic pump 27 System controller 28, 29, 30, 31, 32 valve driver

Claims (2)

[Claims] 1. A screw arranged in a heating cylinder for injecting and filling molten resin into a mold by a forward movement, a normal speed operation mode for feeding only oil from a hydraulic pump to a forward oil chamber, and a forward movement An injection hydraulic cylinder composed of a differential pressure cylinder in which a high speed operation mode in which the oil from the hydraulic pump and the oil from the retreating oil chamber are sent together to the oil chamber can be selected, and the piston rod of the injection hydraulic cylinder. And a moving block that is connected to the rear end of the screw and moves forward and backward integrally with the screw, and is capable of supplying oil selectively. A boosting operation is performed via the moving block that is moved forward by a driving force, and a boosting capability of supplying the boosted oil to the forward oil chamber of the injection hydraulic cylinder is different. A plurality of accumulators, which individually select whether or not to boost the plurality of accumulators, and whether to set the injection hydraulic cylinder to the normal speed operation mode or the high speed operation mode. By selecting the combination mode of the hydraulic actuator operation by selecting, in the injection molding machine that can variably set the combination of the injection speed condition range and the injection pressure condition range, the operator inputs the system controller of the injection molding machine. The optimum combination mode is automatically selected from the combination modes of the hydraulic actuator operation according to the injection resin pressure, and the hydraulic pressure set value is calculated and set from the input injection resin pressure. The injection speed depends on the combination mode of the determined hydraulic actuator operation. Maximum speed After confirming or less, the input calculation and setting a flow rate setting value of the oil from the injection speed, as the injection condition setting method for an injection molding machine, characterized in that the THAT defined. 2. The injection condition setting method for an injection molding machine according to claim 1, wherein the setting of the injection speed is made by inputting an absolute speed value having a relationship corresponding to an injection rate.