JP2000355034A - Mold opening control method in injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the load of an operator accompanied by the maintenance work of a mold. SOLUTION: In a mold opening control method, a mode necessary for performing the maintenance work of a mold is made possible to set as a mold maintenance mode and the mold opening quantity S1 in the mold maintenance mode and the mold opening quantity S2 in a usual molding cycle are preset. When the mold maintenance mode is set, a mold opening process is started (step 2) and it is judged whether the mold maintenance mode is used (step 3) and, when the mold maintenance mode is judged to be used, mold opening is performed up to the mold opening quantity S1 (step 5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold opening control method for an injection molding machine, and more particularly, to a mold opening control method for facilitating work during maintenance of a mold.

[0002]

2. Description of the Related Art In an injection molding machine, a series of molding cycles from a mold closing step to a mold opening step through a measuring step, an injection step, and a pressure-holding step are automatically executed as a normal molding cycle, and this is repeated. Then, in order to shorten the molding cycle time, the opening amount of the mold in a normal molding cycle is set to a value as small as possible, and the moving speed of the movable mold is set to a value as high as possible.

[0003]

Incidentally, in the injection molding machine, it is necessary to replace the mold when changing the molded product, and it is necessary to perform periodic inspection or cleaning. Hereinafter, this is referred to as a mold maintenance operation.
In any case, in the maintenance work of the mold,
The mold is opened by manually performing the mold opening operation. Since the mold opening in this case is the mold opening in a normal molding cycle, there is a problem that the space between the movable mold and the fixed mold is very small, and work is difficult. In addition, the moving speed of the movable mold is also the moving speed in a normal molding cycle and needs to be reduced. This is because a water pipe for cooling is connected to the movable mold, and if the mold opening is increased at a moving speed in a normal molding cycle, the water pipe for cooling may come off.

Therefore, when performing the maintenance work of the mold, the setting of the opening amount of the mold is changed to increase the opening amount of the mold, and the setting change is also performed to reduce the moving speed of the movable mold. I have. However, such a method has the following problems.

[0005] The setting must be changed every time the mold is maintained, which is troublesome.

[0006] After the maintenance work of the mold is completed, if the user forgets to reset the set values, an accident may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold opening control method capable of reducing the operator's work involved in the mold maintenance work.

[0008]

According to a mold opening control method of the present invention, a mode required for performing a mold maintenance operation can be set as a mold maintenance mode, and a mold in the mold maintenance mode can be set. An opening amount S1 and a mold opening amount S2 in a normal molding cycle are set in advance, and when the mold maintenance mode is set, a first step of starting a mold opening process; And a third step of performing mold opening up to the mold opening amount S1 when it is determined that the mold maintenance mode is to be used.

The moving speed V1 of the movable mold in the mold maintenance mode and the moving speed V2 of the movable mold in a normal molding cycle are set in advance, and the second step and the third step are performed. It is preferable to execute a fourth step of moving the movable mold at the moving speed V1 when it is determined that the mold maintenance mode is to be used between the above steps.

When it is determined in the second step that the mold maintenance mode is not used, a fifth step of moving the movable mold at the moving speed V2, and opening the mold to the mold opening amount S2. And a sixth step of performing the following.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described with reference to FIG. The mold opening control method described below is executed when performing a mold maintenance operation. In the present embodiment, a mode necessary for performing a mold maintenance operation is set in the control unit of the injection molding machine as a mold maintenance mode. Further, a mold opening amount S1 in the mold maintenance mode and a mold opening amount S2 in a normal molding cycle (where S1> S2) are set in advance. In this embodiment, the moving speed V1 of the movable mold in the mold maintenance mode and the moving speed V2 of the movable mold in a normal molding cycle (where V1 <V2) are set in advance.

Hereinafter, the mold maintenance mode will be described. In FIG. 1, when the mold maintenance mode is set in step 1, the mold opening process is started in step 2 (first step). Next, in step 3, it is determined whether or not to use the mold maintenance mode (second step). When it is determined that the mold maintenance mode is to be used, the movable mold is moved at the moving speed V1 in step 4 (fourth step). Subsequently, the process proceeds to step 5, where the mold is opened up to the mold opening amount S1 (third step). After this, necessary mold maintenance work, such as replacement and cleaning, is performed.

On the other hand, when it is determined in step 2 that the mold maintenance mode is not used, step 6 (fifth step) of moving the movable mold at the moving speed V2 is executed, and then the process proceeds to step 7. Mold opening S
The mold is opened up to 2 (sixth step).

The mold opening amount (or mold opening limit position) S1
Is made larger than the mold opening S2 by directly giving a set value, adding a certain value to the mold opening S2 in a normal molding cycle, or multiplying by a certain coefficient. On the other hand, the moving speed V1 is determined by directly giving the set value,
By subtracting a certain value from the moving speed V2 in a normal molding cycle or multiplying by a certain coefficient, the moving speed V2 is obtained.
Be smaller. In addition, the present invention, hydraulic, pneumatic,
It is needless to say that the present invention can be applied to any electric injection molding machine.

[0015]

According to the present invention, the operability is improved because it is not necessary to change the setting of the opening amount of the mold and the moving speed of the movable mold every time the maintenance work of the mold is performed. In addition, since there is no need to restore the set values after the maintenance work is completed, there is no occurrence of an accident due to forgetting to return as in the related art, and safety is improved.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining a mold opening control method according to the present invention.

[Explanation of symbols]

 S1, S2 mold opening V1, V2 Moving speed

Continued on the front page (72) Inventor Akira Ito 731-1, Naganumahara-cho, Inage-ku, Chiba-shi, Chiba F-term (reference) in Chiba Works, Sumitomo Heavy Industries, Ltd. 4F202 AM14 AM15 AR06 AR20 CA11 CR01 4F206 AM14 AM15 AR064 AR20 JA07 JL05 JT05

Claims (3)

[Claims] 1. A method for controlling a mold opening of an injection molding machine, wherein a mode required for performing a mold maintenance operation can be set as a mold maintenance mode, and a mold opening amount S1 in the mold maintenance mode. And a mold opening amount S2 in a normal molding cycle are set in advance, and when the mold maintenance mode is set, a first step of starting a mold opening process, and the mold maintenance mode is used. A second step of determining whether or not to use the mold maintenance mode, a third step of opening the mold up to the mold opening amount S1;
A mold opening control method for an injection molding machine. 2. The mold opening control method according to claim 1, wherein
The moving speed V of the movable mold in the mold maintenance mode
1 and the moving speed V2 of the movable mold in the normal molding cycle are set in advance, and it is determined that the mold maintenance mode is used between the second step and the third step. A fourth step of moving the movable mold at a moving speed V1 at times. 3. The mold opening control method according to claim 2,
When it is determined in the second step that the mold maintenance mode is not used, a fifth step of moving the movable mold at a moving speed V2, and a sixth step of opening the mold to the mold opening amount S2. And a step of controlling the mold opening of the injection molding machine.