KR101338655B1 - Injection Molding Machine and Zero Position Adjustment Method Thereof - Google Patents

Abstract

The present invention relates to an injection molding machine and a method for adjusting the zero position thereof.
The present invention calculates the comparative position range within the operating range of the screw based on the current position of the screw is stopped driving when the control device inputs the zero adjustment command, and drive the screw forward and backward at low speed within the comparative position range The target zero torque value of the motor is calculated, the screw is advanced until the torque value of the injection motor reaches the target zero torque value, the driving of the screw is stopped, the screw is retracted by the set distance, and the It is implemented to set the position to the zero position.
According to the present invention, by precisely and automatically adjusting the zero position of the screw which serves to inject the molten injection material into the mold, the cover of the injection device is disassembled every time the zero position of the screw is adjusted, the operator directly pulls the pulley and the belt by hand. Since the zero position of the screw can be adjusted without performing the manual operation of rotating, it is possible to efficiently adjust the zero position of the screw without a lot of manpower and work time.

Description

Injection Molding Machine and Zero Position Adjustment Method Thereof}

The present invention relates to an injection molding machine, and more particularly, to an injection molding machine and a method for adjusting the zero position of the screw to precisely adjust the zero position of the screw which serves to inject the molten injection material into the mold.

In general, an injection molding machine is provided with an injection apparatus, and functions to produce a molded article by melting and injecting an injection material such as plastic, which is a main material of the molded article, and injecting it into a mold.

The conventional injection molding machine is configured as shown in FIG. The injection material injected through the hopper 21 is supplied to the barrel 10, the barrel 10 is heated by the heating units 15a to 15c to melt the injection material supplied into the barrel 10, and the corresponding The molten injection material is transferred to the injection nozzle 17 side by the screw 13 and injected into the mold to produce a molded article.

The process of melting the injection material in the injection device of the conventional injection molding machine and injecting the injection material of the molten state into the mold, as shown in Figure 2, the screw in the barrel 10 forming the body of the injection device (13) is retracted in the direction of the right arrow to receive the injection material from the hopper 21 through the material supply port 12, and the screw 13 in the barrel 10 is advanced in the direction of the left arrow to the molten state It is made of a process of injecting the injection material into the mold through the injection nozzle (17). At this time, the screw 13 advances in the left arrow direction or retreats in the right arrow direction by rotating the pulleys 36a and 36b and the belt 37 by the driving of the injection motor 31.

In the injection molding machine described above, the screw 13 may be damaged due to the initial installation of the injection molding machine, mechanical distortion of the injection motor 31 and the pulleys 36a and 36b and the belt 37, or a software error. The position may deviate from the initial setting value, and if such a problem occurs, it is necessary to readjust the zero position of the screw 13.

Looking at the process of readjusting the zero position of the screw 13 in the conventional injection molding machine as follows.

First, while the power supply of the injection motor 31 is cut off, the pulleys 36a and 36b of the injection motor 31 and the belt 37 are directly rotated by a worker's hand, and the stopper 39 of the injection bracket 33 is rotated. Rotates the pulleys 36a and 36b and the belt 37 of the injection motor 31 to about 1 to 2 mm before contacting the barrel bracket 25.

Then, after the power is supplied to the injection motor 31, the injection zero adjustment button is pressed to set the current position of the screw 13 to the zero position, and the set zero position is set to the zero position of the absolute encoder of the injection motor 31. By storing it in, the zero position of the screw 13 is readjusted.

As described above, in the conventional injection molding machine, when the zero position of the screw 13 is adjusted manually, each time the zero position of the screw 13 is adjusted, the cover of the injection device is disassembled, and the operator directly touches it. Since the pulleys 36a and 36b and the belt 37 need to be rotated, it takes a lot of manpower and time to adjust the zero position of the screw.

The present invention has been proposed in order to solve the problems of the prior art as described above, the object of which is an injection molding machine and its zero point to accurately adjust the zero position of the screw that serves to inject the molten injection material into the mold It is to provide a position adjustment method.

Injection molding machine according to the present invention for achieving the above object, the barrel is heated to melt the injection material supplied to the inside of the barrel, the molten injection material is transferred to the injection nozzle side by a screw injection and the mold In the injection molding machine for adjusting the zero position of the screw, the injection molding machine controls the driving of the injection motor according to the zero position adjustment command and controls the control process of searching for and setting the zero position of the screw while moving the screw forward and backward. Having a device; The control device includes: a microcomputer for performing general processing for adjusting the zero position of the screw; A display unit which displays a driving state of an injection molding machine according to the control of the microcomputer; An input unit having a manual operation unit for inputting various commands for zero position adjustment to the microcomputer; An encoder that detects the driving amount of the injection motor for driving the screw and provides a detection signal for locating the screw, a torque detection sensor for detecting torque of the injection motor, and an injection motor driver for driving the injection motor. Matching unit for matching to the microcomputer; And a memory for storing the general program for adjusting the zero position of the screw and providing it to the microcomputer, and storing general information generated during the zero position adjustment process of the screw by the microcomputer.

According to the injection molding machine according to the present invention, the microcomputer calculates the comparison position range within the operating range of the screw based on the current position of the screw in the stop state when the zero adjustment command is input, and the screw is within the comparison position range. Drive forward and backward at low speed to calculate the target zero torque value of the injection motor, advance the screw until the torque value of the injection motor reaches the target zero torque value, stop the driving of the screw, and retreat by the set distance It is characterized by setting the position of the screw to the zero position.

And, according to the injection molding machine according to the present invention, the comparison position range is calculated by adding up the positive and negative numbers of the same size set at the current position of the screw, the target zero torque value is the front and rear of the screw at a low speed within the comparison position range The maximum torque of the injection motor measured by the true driving is calculated by adding a value corresponding to a specific percentage of the maximum torque.

On the other hand, the zero point adjustment method in the injection molding machine according to the present invention for achieving the object as described above, to adjust the zero position of the screw that serves to inject the injection material in the molten state to the injection nozzle side to inject into the mold A zero position adjustment method in an injection molding machine, the method comprising: calculating, by a control device, a comparison position range within an operating range of a screw based on a current position of a screw which is stopped driving upon input of a zero adjustment command; Calculating, by the controller, a target zero torque value of the injection motor by driving the screw forward and backward at a low speed within the range of the comparison position; The control unit advances the screw until the torque value of the injection motor reaches the target zero torque value, and then stops driving the screw; The control device is characterized in that it comprises the step of retracting the screw by a set distance and setting the position of the screw to the zero position.

According to the zero point adjustment method of the injection molding machine according to the present invention, the step of calculating the comparison position range includes the steps of: detecting the current position of the screw that is stopped by the control device; And calculating, by the controller, the comparison position range by adding positive and negative numbers of the same size preset to the current position of the screw.

And, according to the zero position adjustment method in the injection molding machine according to the present invention, when the comparison position range exceeds the operating range of the screw, the control device advances or retracts the screw at a low speed by a predetermined distance value And further comprising the step of returning to the step of calculating the comparison position range.

Further, according to the zero position adjustment method of the injection molding machine according to the present invention, the step of calculating the target zero torque value of the injection motor, the control device detects the maximum torque of the injection motor while the screw is moving forward and backward at a low speed Making a step; And calculating, by the controller, a target zero torque value by adding a maximum torque of the injection motor to a value corresponding to a specific percentage of the maximum torque.

According to the present invention, by precisely and automatically adjusting the zero position of the screw that serves to inject the molten injection material into the mold, it is possible to efficiently adjust the zero position of the screw without a lot of manpower and work time.

1 is a view showing a conventional injection molding machine.
Figure 2 is a view showing an injection device provided in a conventional injection molding machine.
Figure 3 shows an injection molding machine according to the present invention.
4 is a view showing a control device provided in the injection molding machine according to the present invention.
5 is a view showing a zero position adjustment process in the injection molding machine according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Injection molding machine according to the invention is made as shown in FIG. The injection molding machine according to the present invention supplies the injection material injected through the hopper 61 to the barrel 50, heats the barrel 50 by the heating units 55a to 55c, and supplies the inside of the barrel 50. The molten injection material is melted, and the molten injection material is transferred to the injection nozzle 57 by a screw 53 and injected into the mold to produce a molded article.

The injection molding machine according to the present invention drives the injection motor 71 by the control device 90 to rotate the pulleys 76a and 76b and the belt 77 so as to move the screw 53 automatically of the screw 53. It is implemented to search and adjust the zero position.

As shown in FIG. 4, the control device 90 includes a microcomputer 91 and a memory 92. And a display unit 93, an input unit 94, and a matching unit 95.

The microcomputer 91 performs various processes for adjusting the zero position of the screw 53 based on a program stored in the memory 92. The display unit 93 displays the driving state of the injection molding machine under the control of the microcomputer 91.

The input unit 94 includes input means such as a keypad that is manually operated to input various commands for adjusting the zero position to the microcomputer 91. The matching unit 95 includes an encoder (not shown) for detecting the rotational drive amount of the injection motor 71, a torque detection sensor (not shown) for detecting the torque of the injection motor 71, and an injection motor ( Matching the injection motor driving unit (not shown) for driving 71), matching the detection signal input from the encoder and the torque detection sensor and input it to the microcomputer 91, the injection motor control signal from the microcomputer 91 Match and output to injection motor drive unit.

The memory 92 also stores a general program for adjusting the zero position of the screw 53. The program is provided to the microcomputer 91, and general information generated during the zero position adjustment process of the screw 53 by the microcomputer 91 is stored.

The microcomputer 91 of the control device 90 adjusts the zero position of the screw 53 according to the command through the input unit 94, while driving the injection motor 71 to move the screw 53 forward and backward to adjust the zero position. Perform the process of searching and setting. The microcomputer 91 detects the position of the screw 53 while driving the injection motor 71. The microcomputer 91 detects a position input from the encoder 95 which is used to detect the driving amount of the injection motor 71. The position of the screw 53 can be detected by calculating the moving distance of the screw 53 based on the signal.

Then, the microcomputer 91 detects the torque of the injection motor 71 while moving the screw 53 forward and backward, and based on the detection signal input through the matching unit 95 from the torque detection sensor, Torque can be detected.

In the following description, moving the screw 53 forward means moving the screw 53 in the direction of the injection nozzle 57, and moving the screw 53 backward moves the screw 53 the injection nozzle. It means to move in the opposite direction to the (57) side.

In addition, when the screw 53 is moved back and forth, the assembly including the stopper 79, the injection motor 71, the injection bracket 73, the pulleys (76a, 76b) and the belt 77 is a screw 53 Similarly move forward and backward integrally with.

In the following description, the position of the screw 53 refers to the position of the screw 53 in contact with the tip of the barrel bracket 65 facing the injection bracket 73.

When the zero position adjustment command is input, the microcomputer 91 detects and stores the current position of the screw 53 which is stopped moving through the encoder, calculates the comparison position range by adding the preset distance value to the current position, and When the comparison position range is within the operating range of the screw 53, the screw 53 is driven at a low speed to drive the target zero torque value while driving within the corresponding comparison position range, and the injection motor 71 is detected by the torque detection sensor. Calculate by adding the value corresponding to a specific percentage of the maximum torque to the maximum torque.

Thereafter, the microcomputer 91 advances the screw 53 at a low speed, when the torque value of the injection motor 71 detected through the torque detection sensor reaches the target zero torque value stored in the memory 92 (injection). The stopper 79 of the bracket 73 comes into contact with the barrel bracket 65) and stops the driving of the screw 53, and then retracts the screw 53 by a predetermined distance to While ensuring a mechanical collision avoidance distance between the barrel brackets 65, the final position of the retracted screw 53 is set to the zero position, but the current position of the screw 53 grasped through the encoder is stored in the memory 92. Save to the zero position.

The injection molding machine according to the present invention having the function as described above is performed as shown in FIG. 5 when adjusting the zero position.

First, when the zero position adjustment command is input through the input unit 94 to start the zero position adjustment (S111), the microcomputer 91 of the control device 90 sets the encoder to the current position of the stationary screw 53. Detecting through, and stores the current position of the screw 53 in the memory 92 (S112).

Then, the microcomputer 91 calculates a comparison position range by adding a preset distance value (for example, ± 10 mm) to the current position of the stored screw 53, and stores the calculated comparison position range in the memory 92. After storing (S113), it is determined whether the corresponding comparison position range is within the forward and backward operating range of the screw 53 (S114).

At this time, when it is determined that the comparison position range is not within the forward and backward operating range of the screw 53, the microcomputer 91 outputs a control signal to the injection motor driving unit through the matching unit 95 to control the injection motor 71. By driving, the screw 53 is moved forward or backward at a low speed by a predetermined distance value (for example, 20 mm) (S122), and returns to S112 to repeat the above-described processing.

In addition, when it is determined in S114 that the corresponding comparison position range is within the forward and backward operating range of the screw 53, the microcomputer 91 outputs a control signal to the injection motor driving unit through the matching unit 95 to inject the injection motor 71. Drive the screw 53 forward and backward at a low speed by a predetermined distance value (for example, 10mm) (S115).

In this way, the microcomputer 91 has the maximum torque of the injection motor 71 detected through the torque detection sensor while the screw 53 is being moved forward and backward at a low speed, and at a specific percentage (eg, 10%) of the maximum torque. The target zero torque value calculated by summing the corresponding values is stored in the memory 92 (S116), and while the screw 53 is advanced at low speed (S117), the torque of the injection motor 71 detected through the torque detection sensor. It is determined whether the value reaches the target zero point torque value stored in the memory 92 (S118).

At this time, if the torque value of the injection motor 71 detected through the torque detection sensor does not reach the target zero torque value stored in the memory 92, the microcomputer 91 returns to S117 to perform a repeat process.

In addition, the microcomputer 91 receives a stopper 79 of the injection bracket 73 when the torque value of the injection motor 71 detected through the torque detection sensor in S118 reaches the target zero torque value stored in the memory 92 (ie, the injection bracket 73). ) Stops the driving of the screw 53, and then retreats the screw 53 by a predetermined distance (e.g., 2 mm) to stop the stopper 79 and the barrel bracket ( 65) to secure a mechanical collision avoidance distance (S119).

In addition, the microcomputer 91 sets the final position of the retracted screw 53 as a zero position, but stores the current position obtained through the encoder as a zero position in the memory 92 (S120), and ends the zero position adjustment. (S121).

The injection molding machine according to the present invention as described above accurately and automatically adjusts the zero position of the screw 53 which serves to inject the molten injection material into the mold, thereby covering the injection device every time the zero position of the screw 53 is adjusted. Since the operator can adjust the zero position of the screw without the manual operation of manually rotating the pulley and belt by hand, the zero position of the screw can be efficiently adjusted without requiring much manpower and working time.

The present invention is not limited to the above description, and those skilled in the art can change the present invention in various forms without departing from the technical spirit of the present invention. It will be said that such modifications fall within the technical scope of the present invention.

The present invention may be usefully applied to an injection molding machine. According to the present invention, by precisely and automatically adjusting the zero position of the screw which serves to inject the molten injection material into the mold, the cover of the injection device is disassembled every time the zero position of the screw is adjusted, the operator directly pulls the pulley and the belt by hand. Since the zero position of the screw can be adjusted without performing the manual operation of rotating, it is possible to efficiently adjust the zero position of the screw without a lot of manpower and work time.

10, 50; Barrel 15a-15c. 55a-55c; Heating section
13, 53; Screw 17, 57; Injection nozzle
21, 61; Hopper 25, 65; Barrel bracket
31, 71; Injection motors 33 and 73; Injection bracket
36a, 36b, 76a, 76b; Pulleys 37, 77; belt
39, 79; Stopper 90; Control device
91; Micom 92; Memory
93; Display section 94; Input
95; The matching portion

Claims (8)

In the injection molding machine for heating the barrel to melt the injection material supplied in the interior of the barrel, and transfer the molten injection material to the injection nozzle side by a screw and injects it into a mold, and adjusts the zero position of the screw,
A control device for controlling the driving of the injection motor according to the zero position adjustment command to control and search for and set the zero position of the screw while moving the screw forward and backward;
The control device includes:
A microcomputer for performing general processing for adjusting the zero position of the screw;
A display unit which displays a driving state of an injection molding machine according to the control of the microcomputer;
An input unit having a manual operation unit for inputting various commands for zero position adjustment to the microcomputer;
An encoder that detects the driving amount of the injection motor for driving the screw and provides a detection signal for locating the screw, a torque detection sensor for detecting torque of the injection motor, and an injection motor driver for driving the injection motor. Matching unit for matching to the microcomputer;
And a memory for storing the general program for adjusting the zero position of the screw and providing it to the micom, and storing general information generated during the zero position adjustment process of the screw by the microcomputer.
The method of claim 1,
The microcomputer calculates the comparison position range within the operating range of the screw on the basis of the current position of the screw in the driving stop state when the zero adjustment command is input, and drives the screw forward and backward at a low speed within the comparison position range to inject the motor. The target zero torque is calculated, the screw is moved forward until the torque value of the injection motor reaches the target zero torque value, the driving of the screw is stopped, and the position of the screw retracted by the set distance is set to the zero position. Injection molding machine, characterized in that.
3. The method of claim 2,
The comparison position range is injection molding machine, characterized in that to calculate the sum of the positive and negative numbers of the same size set at the current position of the screw.
3. The method of claim 2,
And the target zero torque value is calculated by adding a value corresponding to a specific percentage of the maximum torque to the maximum torque of the injection motor measured by driving the screw forward and backward at a low speed within the range of the comparison position.
In the zero position adjustment method in the injection molding machine for adjusting the zero position of the screw which transfers the molten injection material to the injection nozzle side and injects into the mold,
Calculating, by the controller, a comparison position range within the operating range of the screw based on the current position of the screw being stopped when the zero adjustment command is input;
Calculating, by the controller, a target zero torque value of the injection motor by driving the screw forward and backward at a low speed within the range of the comparison position;
The control unit advances the screw until the torque value of the injection motor reaches the target zero torque value, and then stops driving the screw;
The control method of the zero position in the injection molding machine, characterized in that the constant control device comprises the step of retracting the screw by a set distance and the position of the screw to the zero position.
The method of claim 5,
The step of calculating the comparison position range,
Detecting, by the control device, the current position of the screw being stopped;
And calculating the comparison position range by adding the positive and negative numbers of the same size preset to the current position of the screw.
The method according to claim 5 or 6,
If the comparison position range exceeds the operating range of the screw, the control unit further advances or retracts the screw at a low speed by a predetermined distance value, and then returning to calculating the comparison position range. Method for adjusting the zero position in the injection molding machine, characterized in that.
The method of claim 5,
Calculating a target zero torque value of the injection motor,
Detecting, by the controller, the maximum torque of the injection motor while advancing the screw back and forth at low speed;
And the control device calculates a target zero torque value by adding a maximum torque of the injection motor to a value corresponding to a specific percentage of the maximum torque.

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