WO2021223575A1 - Method and apparatus for eliminating influence on mold closing precision in case of mold closing overshoot during compression molding of injection molding machine - Google Patents

Abstract

Disclosed is a method for eliminating an influence on the mold closing precision in the case of mold closing overshoot during compression molding of an injection molding machine. The method comprises the following steps: controlling a movable mold plate for mold closing; stopping driving of the movable mold plate when the movable mold plate moves to a first preset position; acquiring an overshoot position of the movable mold plate after driving of the movable mold plate is stopped; controlling and driving a pull rod band brake to execute a mold locking action when the movable mold plate is in the overshoot position; and pulling the movable mold plate, by means of a pull rod, to move in a direction close to a static mold plate when the mold locking action is executed. According to the present invention, the influence on the mold closing precision in the case of mold closing overshoot during compression molding of an injection molding machine can be eliminated, so that the repetition precision and the positioning precision from mold plate closing to a mold closing position can be improved; and an injection action is executed before the movable mold plate is attached to the static mold plate, so that the time for a compression process can be reduced.

Description

Method and device for eliminating overshoot of injection molding machine compression molding mold clamping and affecting mold clamping accuracy Technical field

The invention relates to the technical field of injection molding machine compression molding, in particular to a method and a device for eliminating the overshoot of the injection molding machine compression molding mold clamping and affecting the mold clamping accuracy.

Background technique

When the injection molding machine compresses and molds the product, it usually closes the mold directly. When the mold is closed, the movable mold plate continues to move until it fits with the static mold plate. Then, the driving of the movable mold plate is stopped, and then the lever brake is activated to perform the mold clamping action.

In the mold clamping process, when the movable mold plate is stopped, the movable mold plate still has kinetic energy due to the inertia of the movable mold plate. The driving of the movable mold plate is stopped when the movable mold plate is attached to the movable mold plate. The kinetic energy of the movable mold plate will inevitably affect A certain amount of overshoot will occur on the static template. The overshoot of the movable template affects the accuracy of mold clamping. With the accumulation of mold clamping times, the repeat accuracy of mold clamping is greatly impaired, and the accuracy of mold clamping positioning is also greatly impaired.

Summary of the invention

In view of the above-mentioned shortcomings of the prior art, the present invention proposes a method to eliminate the overshoot of the compression molding of the injection molding machine, which affects the accuracy of the clamping. .

The technical solutions adopted by the present invention to solve its technical problems are:

A method for eliminating the overshoot of the injection molding machine's compression molding mold clamping and affecting the mold clamping accuracy, including the steps:

Control the clamping of the movable template; when the movable template moves to the first preset position, stop the driving of the movable template;

Collect the overshoot position of the movable template after stopping the driving of the movable template;

When the movable mold plate is in the overshoot position, the pull rod brake is controlled and driven to perform the mold clamping action; when the mold clamping action is executed, the movable mold plate is pulled by the pull rod to move in a direction close to the static mold plate.

Preferably, during the execution of the clamping action, the injection action is started when the movable template moves to the second preset position.

Preferably, the second preset position and the first preset position of the movable template are set by the position of the static template as the reference position, and the distances from the second preset position and the first preset position to the static template are S1, respectively S2; and S1>S2.

Preferably, the collected overshoot position of the moving template is measured from the position of the static template as a reference position, and the distance between the overshoot position and the static template is S3, and S1>S3>S2.

Preferably, before controlling and driving the drawbar brake to perform the clamping action when the movable template is in the overshoot position, the target position of the drawbar brake is calculated according to the collected overshoot position of the movable template.

A device that eliminates the overshoot of the injection molding machine's compression molding and mold clamping that affects the accuracy of mold clamping, including:

The control module is used to control the clamping of the movable template; when the movable template moves to the first preset position, stop the driving of the movable template;

The acquisition module is used to collect the overshoot position of the movable template after the driving of the movable template is stopped;

The control module is also used to control and drive the pull rod to hold the brake when the movable mold plate is in the overshoot position to perform a mold locking action; when the mold lock is executed, the movable mold plate is pulled by the pull rod to move in a direction close to the static mold plate.

Preferably, in the process of performing the clamping action, the control module initiates the injection action when the movable template moves to the second preset position.

Preferably, it further includes an editing module for setting the first preset position and the second preset position based on the static template; the second preset position and the first preset position are to the static template The distances are S1 and S2 respectively; and S1>S2.

Preferably, it further includes a position ruler for measuring the distance between the overshoot position and the static template; the distance between the overshoot position and the static template is S3; S1>S3>S2.

Preferably, the control module calculates the target position of the drawbar brake according to the collected overshoot position of the movable template before controlling and driving the drawbar brake to perform the clamping action when the movable template is in the overshooting position.

The present invention has the following beneficial effects:

1. The present invention can eliminate the influence of injection molding machine compression molding on the accuracy of mold clamping caused by mold clamping overshoot, so as to improve the repeatability and positioning accuracy of the template from the mold clamping to the closed position of the mold;

2. Perform the injection action before the dynamic template and the static template are attached, which can reduce the time of the compression process;

3. The gap between the tie rod and the tie rod nut is eliminated in advance, and the response of the injection action is faster;

4. Perform the injection action before the movable template and the static template are attached, which is more convenient for the discharge of air in the mold cavity and can improve the quality of the product.

Description of the drawings

FIG. 1 is a schematic flow chart of a method for eliminating the overshoot of compression molding of an injection molding machine and affecting the accuracy of mold clamping in Example 1. FIG.

2 is a block diagram of a device in Embodiment 2 that eliminates the overshoot of the injection molding machine's compression molding and mold clamping and affects the accuracy of mold clamping.

FIG. 3 is a schematic diagram of the structure of a device that eliminates the overshoot of the injection molding machine's compression molding mold clamping and affects the mold clamping accuracy in the embodiment 2 from the mold clamping action, the mold clamping action to the injection.

Among them, 10, dynamic template; 20, static template; 30, tie rod; 40, position ruler; 100, control module; 200, acquisition module; 300, editing module.

Detailed ways

The following are specific embodiments of the present invention combined with the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

When the injection molding machine compresses and molds the product, it usually closes the mold directly. When the mold is closed, the movable template 10 continues to move until it fits the static template 20, and then stops the driving of the movable template 10, and then activates the lever 30 to perform the lock. Mode action.

During the mold clamping process, when the movable mold plate 10 is stopped, due to the inertia of the movable mold plate 10, the movable mold plate 10 still has kinetic energy. The driving of the movable mold plate 10 is stopped when the movable mold plate 10 is attached to the movable mold plate 10. The kinetic energy will inevitably act on the static template 20, and will produce a certain overshoot. The overshoot of the movable template 10 affects the accuracy of mold clamping. With the accumulation of mold clamping times, the repeat accuracy of mold clamping is greatly impaired, and mold clamping positioning The accuracy is also greatly impaired.

Please refer to Figures 1 to 3, the present invention discloses a method and device for eliminating the overshoot of the injection molding machine's compression molding mold clamping and affecting the mold clamping accuracy.

A method to eliminate the overshoot of the compression molding of the injection molding machine, which affects the accuracy of the clamping. The process of the injection molding machine from clamping to clamping is disclosed. On the static template 20, the specific steps are as follows:

Control the movable mold plate 10 to close the mold; when the movable mold plate 10 moves to the first preset position, stop the driving of the movable mold plate 10;

Collect the overshoot position of the movable template 10 after the driving of the movable template 10 is stopped;

When the movable platen 10 is in the overshoot position, control and drive the pull rod 30 to hold the brake to perform the clamping action; when the clamping action is performed, the movable platen 10 is pulled by the pull rod 30 to move towards the direction of the static platen 20 until the two fit together .

Specifically, when the injection molding machine is closing the mold, the movable template 10 stops driving the template 10 at the first preset position when there is a certain distance from the static template 20. Because of inertia, the movable template 10 will still move toward the static template 20. Move in the direction and stop completely after moving for a certain distance. At this time, the position of the movable template 10 is the overshoot position, and the overshoot position is between the second preset position and the static template 20.

After the movable template 10 stops at the overshoot position, the overshoot position is collected, and the pull rod 30 is driven according to the collected overshoot position, so that the pull rod 30 is braked and locked until the movable template 10 and the static template 20 fit.

During the execution of the clamping action, the injection action is started when the movable template 10 moves to the second preset position.

The second preset position is between the static template 20 and the overshoot position. There is a small gap between the second preset position and the static template 20. When the movable template 10 moves to the second preset position, The injection action is executed, that is, the injection action is executed before the movable template 10 and the static template 20 are completely closed, and the injection action is performed before the movable template 10 and the static template 20 are not completely closed, which can reduce the requirements on the clamping force , The mutual stress between the movable template 10 and the static template 20 can also be reduced.

The second preset position and the first preset position of the movable template 10 are set by the position of the static template 20 as the reference position, and the distances from the second preset position and the first preset position to the static template 20 are respectively S1, S2; and S1>S2.

Specifically, the first preset position and the second preset position are quantified based on the position of the static template 20, which facilitates the stop control of the mold clamping action and the start control of the injection action.

The collected overshoot position of the movable template 10 is measured from the position of the static template 20 as the reference position, and the distance between the overshoot position and the static template 20 is S3, and S1>S3>S2.

In order to facilitate the acquisition of the overshoot position of the movable template 10, it is necessary to use a stationary object as a reference position, and determine the overshoot position by quantifying the distance between the overshoot position and the reference position.

In this embodiment, the overshoot position is determined by taking the static template 20 as the reference position.

When the movable template 10 is at the overshooting position, before controlling and driving the brake of the draw rod 30 to perform the mold clamping action, the target position of the draw rod 30 for holding the brake is calculated according to the collected overshooting position of the movable template 10.

Specifically, the movable template 10 stops at the overshoot position. After the overshoot position is collected, the target position of the tie rod 30 is determined according to the overshoot position, and the tie rod 30 is driven to perform the brake action at the overshoot position according to the target position, and drive The template 10 moves in the direction where the static template 20 is located.

The movable template 10 continues to move, and when the movable template 10 is in contact with the static template 20, the mold continues to be locked.

Example 2

A device that eliminates the overshoot of the compression molding of an injection molding machine and affects the accuracy of mold clamping, which implements a method for eliminating the overshoot of the compression molding of an injection molding machine and affects the accuracy of mold clamping. The device specifically includes:

The control module 100 is used to control the mold clamping of the movable mold plate 10; when the movable mold plate 10 moves to the first preset position, the driving of the movable mold plate 10 is stopped;

The control module 100 may specifically be a PLC, and the PLC may control the driving of the movable template 10.

The collection module 200 is used to collect the overshoot position of the movable template 10 after the driving of the movable template 10 is stopped.

The acquisition module 200 is specifically used to collect the position of the movable template 10. After the movable template 10 stops the mold clamping action, it will move for a certain distance due to inertia and stop. The position where the movable template 10 stops is the overshoot position.

The control module 100 is also used to control and drive the pull rod 30 to hold the brake when the movable die plate 10 is in the overshoot position to perform a mold locking action;

The control module 100 calculates the target position of the pull rod 30 according to the overshoot position. The control module 100 controls and drives the pull rod 30 to the target position to hold the brake, and then drives the movable template 10 to move to the position of the static template 20 to perform the lock The mold action makes the movable mold plate 10 and the static mold plate 20 fit together.

When the clamping action is performed, the movable template 10 is pulled by the pull rod 30 to move in a direction close to the static template 20 until the two are attached.

In the process of performing the clamping action, the control module 100 starts the injection action when the movable template 10 moves to the second preset position.

Ordinary injection molding machines perform brake clamping after the movable platen 10 and the static platen 20 are closed, and then perform injection compression. There is a response time, because when the brake is locked, there is a gap between the lock nut and the tie rod 30, and the tie rod 30 moves The mold can be locked after overcoming the gap, and it takes a certain time for the pull rod 30 to move to overcome the gap. This time is the response time.

Performing injection when the movable template 10 and the static template 20 are not closed can reduce the time of compression. When the injection action is turned on, because the tie rod 30 continues to pull the movable template 10 to move toward the static template 20, there is no response time. The gap between the nuts of the tie rod 30 has already been overcome (when the movable platen 10 is in the process position, the tie rod 30 is braked and executed the clamping action has been overcome), therefore, the device proposed in this application has a shorter compression injection time.

Injecting when the movable template 10 and the static template 20 are not yet fully attached, which is beneficial to the discharge of air in the mold cavity and can improve the quality of the product; in this embodiment, the gap between the second preset position and the static template 20 is very small, and the injection molding During the injection operation of the machine, the bonding of the movable mold plate 10 and the static mold plate 20 must be completed before the mold cavity is filled.

The device also includes an editing module 300, which is used to set a first preset position and a second preset position using the static template 20 as a reference position; the second preset position and the first preset position The distances to the static template 20 are respectively S1 and S2; and S1>S2.

The device also includes a position ruler 40 for measuring the distance between the overshoot position and the static template 20; the distance between the overshoot position and the static template 20 is S3; S1>S3 >S2.

The invention can eliminate the influence of the compression molding of the injection molding machine on the accuracy of mold clamping caused by mold clamping overshoot, so as to improve the repeatability and positioning accuracy from the mold clamping to the closed position of the mold. It is executed before the movable mold plate 10 and the static mold plate 20 are attached. The injection action can reduce the time of the compression process.

The specific embodiments described herein are merely examples to illustrate the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the specific embodiments described or use similar alternatives, but they will not deviate from the spirit of the present invention or exceed the definition of the appended claims. Range.

Claims (10)

1. A method for eliminating the overshoot of an injection molding machine's compression molding mold clamping and affecting mold clamping accuracy, which is characterized in that it comprises the following steps:

   Control the clamping of the movable template; when the movable template moves to the first preset position, stop the driving of the movable template;

   Collect the overshoot position of the movable template after stopping the driving of the movable template;

   When the movable mold plate is in the overshoot position, the pull rod brake is controlled and driven to perform the mold clamping action; when the mold clamping action is executed, the movable mold plate is pulled by the pull rod to move in a direction close to the static mold plate.
2. The method for eliminating the overshoot of the compression molding of the injection molding machine, which affects the accuracy of the clamping of the mold according to claim 1, is characterized in that, in the process of performing the clamping action, it is activated when the movable platen moves to the second preset position. Injection action.
3. The method for eliminating the overshoot of the compression molding of the injection molding machine and affecting the accuracy of the clamping according to claim 2, wherein the second preset position and the first preset position of the movable platen are determined from the position of the static platen For the reference position setting, the distances from the second preset position and the first preset position to the static template are respectively S1 and S2; and S1>S2.
4. According to claim 3, a method for eliminating overshoot of injection molding machine compression molding mold clamping and affecting mold clamping accuracy, characterized in that the collected overshoot position of the movable template is measured from the position of the static template as the reference position, so The distance between the overshoot position and the static template is S3, and S1>S3>S2.
5. According to claim 1, a method for eliminating overshoot of injection molding machine compression molding and mold clamping that affects mold clamping accuracy, characterized in that when the movable platen is in the overshoot position, the lever brake is controlled and driven to perform the clamping action before , Calculate the target position of the tie rod brake according to the collected overshoot position of the moving template.
6. A device that eliminates the overshoot of an injection molding machine's compression molding and mold clamping that affects the accuracy of mold clamping, which is characterized in that it includes:

   The control module is used to control the clamping of the movable template; when the movable template moves to the first preset position, stop the driving of the movable template;

   The acquisition module is used to collect the overshoot position of the movable template after the driving of the movable template is stopped;

   The control module is also used to control and drive the pull rod to hold the brake when the movable mold plate is in the overshoot position to perform a mold locking action; when the mold lock is executed, the movable mold plate is pulled by the pull rod to move in a direction close to the static mold plate.
7. The device for eliminating the overshoot of compression molding of an injection molding machine and affecting the accuracy of mold clamping according to claim 6, characterized in that, in the process of performing the clamping action, the control module moves to the second pre-set when the movable platen is moved. The injection action is started when the position is set.
8. The device for eliminating the overshoot of the injection molding machine's compression molding mold clamping and affecting the accuracy of mold clamping according to claim 7, characterized in that it further comprises an editing module for setting the first position based on the static template. A preset position and a second preset position; the distances from the second preset position and the first preset position to the static template are respectively S1 and S2; and S1>S2.
9. The device for eliminating the overshoot of the compression molding of the injection molding machine and affecting the accuracy of the clamping according to claim 8, characterized in that it further comprises a position ruler for measuring the overshoot position and the static template. The distance between the overshoot position and the static template is S3; S1>S3>S2.
10. The device that eliminates the overshoot of the compression molding of the injection molding machine and affects the accuracy of the clamping according to claim 6, wherein the control module controls and drives the lever brake to perform when the movable platen is in the overshoot position. Before the clamping action, the target position of the tie rod brake is calculated according to the collected overshoot position of the moving template.

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