JP4125841B2 - Mold opening control method in injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold opening control method in an injection molding machine, and more particularly to a mold opening control method when a molding machine is started up.
[0002]
[Prior art]
Usually, in an injection molding machine, a fully automatic operation mode (hereinafter abbreviated as a fully automatic mode), a semi-automatic operation mode (hereinafter abbreviated as a semi-automatic mode), and a manual operation mode (hereinafter abbreviated as a manual mode). It is comprised so that driving | operation is possible. The fully automatic mode is a mode in which a series of operations from the mold closing process to the mold opening process through the weighing process, the injection process, and the pressure holding process are automatically performed and repeated. On the other hand, the semi-automatic mode is a mode in which the above series of operations is automatically performed only once. The mold opening process is followed by an operation of ejecting the molded product in the mold by the eject mechanism. In addition, the manual mode is a mode in which all the above steps are performed manually.
[0003]
The operation in the fully automatic mode and the semi-automatic mode will be described with reference to FIG. In FIG. 2, any one of the semi-automatic mode M1, the fully automatic mode M2, and the manual mode is set in advance by the mode setting means. A mold opening amount S20 during the mold opening operation is also set in advance.
[0004]
When the molding operation starts, it is determined which mode is the operation mode (step 11). If it is either the semi-automatic mode M1 or the full-automatic mode M2, the process proceeds to step 12 to start the mold closing process. In step 13, a weighing process, an injection process, and a pressure holding process are performed. Next, in step 14, the mold opening process starts. Subsequently, in step 15, mold opening is performed until the mold opening amount becomes S20.
[0005]
When the mold opening amount reaches S20, it is determined whether or not the operation mode is the fully automatic mode M2. In the case of the fully automatic mode M2, the process returns to step 12 and the above operation is repeated. If it is not the fully automatic mode M2, the operation is terminated.
[0006]
The mold opening amount in the conventional mold opening operation of the injection molding machine uses the same set value S20 regardless of whether the semi-automatic mode M1 or the fully automatic mode M2 as described above. The set value S20 is set to a minimum value from the viewpoint of shortening the molding cycle as much as possible.
[0007]
In such an injection molding machine, in order to save labor, in the fully automatic mode M2, in many cases, a molded product ejected from a mold by an ejecting mechanism is automatically taken out using a product take-out machine during a mold opening process.
[0008]
[Problems to be solved by the invention]
On the other hand, the semi-automatic mode M2 is often set when the molding machine is started up. This is because when the molding machine is started up, the amount of resin to be filled in the mold is small and it is often started from a short shot state, and it is necessary to change various set values while observing the state of the molded product. Because. Therefore, the product take-out machine is not used in the semi-automatic mode M1. However, when the molding machine is started up, particularly in a short shot state, the molded product in the mold may not be discharged by the eject mechanism. In this case, the operator must take out the molded product from the mold. This is because the mold may be damaged if the next molding operation is performed while the molded product remains in the mold. However, since the mold opening amount setting value S20 is not so large, there is not much space for the operator to operate with a jig or hand. For this reason, the molded product removal operation when the molded product remains in the mold is very troublesome.
[0009]
Therefore, an object of the present invention is to provide a mold opening control method capable of facilitating the work of taking out a molded product from a mold in a semi-automatic mode.
[0010]
[Means for Solving the Problems]
The mold opening control method according to the present invention includes a semi-automatic mode M1 which is a mode in which a series of operations from a mold closing process to a mold opening process through a metering process, an injection process, and a pressure holding process are automatically performed only once . In an injection molding machine that can be operated in a fully automatic mode M2 , which is a mode in which the operation is automatically performed and repeated, it is set in advance whether to operate in the semi-automatic mode M1 or the fully automatic mode M2, The mold opening amount S1 of the mold in the semi-automatic mode M1 and the mold opening amount S2 of the mold in the fully automatic mode M2 are set, and when the mold opening process starts for each molding cycle, the semi-automatic A first step for determining the distinction between the mode M1 and the fully automatic mode M2, and a second step for performing mold opening with the mold opening amount S1 when it is determined that the mode is the semiautomatic mode M1. It is characterized by performing the operation including.
[0011]
A mode M3 indicating that the mold opening amount S1 is used is set together with the setting of the semi-automatic mode M1, and in the first step between the first step and the second step, the mode M3 is set. When the semi-automatic mode M1 is determined, a third step of determining whether or not the mode M3 using the mold opening amount S1 is executed, and the mode M3 using the mold opening amount S1 is determined. Sometimes it is preferred that the second step is performed.
[0012]
Further, a fourth step of determining whether or not the mold opening amount S1 is larger than the mold opening amount S2 may be executed between the third step and the second step. .
[0013]
When it is determined in the first step that the fully automatic mode M2 is selected, or when it is determined that the mode is not the mode M3 using the mold opening amount S1 in the third step, or the fourth When it is determined that the mold opening amount S1 is smaller than the mold opening amount S2, the fifth step of performing mold opening with the mold opening amount as S2 and the fifth step are followed. The sixth step of determining whether or not the mode is the fully automatic mode M2 is executed, and when it is determined that the mode is the fully automatic mode M2, the process returns to the mold closing step.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1, the mold opening control method by embodiment of this invention is demonstrated. The mold opening control method described below is executed particularly when the molding machine described above is started up. Also in this embodiment, any one of the semi-automatic mode M1, the fully automatic mode M2, and the manual mode is set in advance by the mode setting means. In this embodiment, in addition to the mold opening amount S2 during the mold opening operation in the fully automatic mode M2, the mold opening amount S1 during the mold opening operation in the semi-automatic mode M1 is set in advance. The mold opening amount S1 is larger than the mold opening amount S2. In this embodiment, when the semi-automatic mode M1 is set, a mode M3 indicating that the mold opening amount S1 is used is set.
[0015]
When the molding operation starts, it is determined which mode the operation mode is (step 1). If it is either the semi-automatic mode M1 or the full-automatic mode M2, the process proceeds to step 2 and the mold closing process starts. In step 3, a weighing process, an injection process, and a pressure holding process are executed. Next, in step 4, the mold opening process starts.
[0016]
When the mold opening process starts, the distinction between the semi-automatic mode M1 and the fully automatic mode M2 is determined in step 5 (first step). And when it determines with semiautomatic mode M1, it transfers to step 6 and it is determined whether it is mode M3 which uses mold opening amount S1 (3rd step). The mode M3 is set because the mold opening amount may not be set to S1 even in the semi-automatic mode M1, but such setting of the mode M3 may be omitted. .
[0017]
When it is determined in step 6 that the mode is M3, it is determined in next step 7 whether the mold opening amount S1 is larger than the mold opening amount S2 (fourth step). The setting of such step 7 takes into consideration that a value smaller than the mold opening amount S2 may be set as the mold opening amount S1 by mistake, and may be omitted in some cases.
[0018]
When it is determined that the mold opening amount S1 is larger than the mold opening amount S2, the process proceeds to the next step 8 where mold opening with the mold opening amount as S1 is performed (second step). This completes one molding operation in the semi-automatic mode M1. However, in parallel with step 8, the molded product is ejected by the ejection mechanism. Take out the molded product in the mold with tools and fingers. At that time, the mold opening amount S1 is sufficiently larger than the mold opening amount S2 in the fully automatic mode M2, and therefore the take-out operation is easy.
[0019]
On the other hand, when it is determined in step 5 that the fully automatic mode M2 is selected, or when it is determined in step 6 that the mode is not the mode M3 using the mold opening amount S1, or in step 7, the mold opening amount S1 is the mold opening amount. When it is determined that the value is smaller than S2, the process proceeds to step 9. In step 9, the mold opening amount is set to S2 to perform mold opening (fifth step). Next, the process proceeds to step 10 following step 9, and it is determined whether or not the mode is the fully automatic mode M2 (sixth step). If it is determined in step 10 that the mode is the fully automatic mode M2, the process returns to the mold closing process in step 2 and the molding operation is repeated. If it is determined that the mode is not the fully automatic mode M2, the operation is terminated.
[0020]
The mold opening amount (or mold opening limit position) S1 in the semi-automatic mode M1 is directly given a set value, added with a value in the mold opening amount S2 in the fully automatic mode M2, or multiplied by a certain coefficient. By doing so, it is made larger than the mold opening amount S2.
[0021]
Further, the present invention can be applied to any type of injection molding machine of hydraulic type, pneumatic type and electric type.
[0022]
【The invention's effect】
In the present invention, the mold opening amounts in the semi-automatic mode and the full-automatic mode are separately set in advance and can be selected by mode setting. Therefore, the operation is simple. Even when the molded product remains in the inside, the take-out operation can be easily performed.
[Brief description of the drawings]
FIG. 1 is a flowchart for explaining a mold opening control method according to the present invention.
FIG. 2 is a flowchart for explaining a conventional mold opening / closing control method;
[Explanation of symbols]
M1 Semi-automatic mode M2 Fully automatic mode

Claims (1)

A series of operations from the mold closing process to the mold opening process through the weighing process, the injection process, and the pressure holding process are automatically performed only once, and the semi-automatic mode M1 and the above series of operations are automatically performed and repeated. In an injection molding machine that can be operated in the fully automatic mode M2, which is a mode,
It is set in advance whether to operate in the semi-automatic mode M1 or the fully automatic mode M2, and the mold opening amount S1 of the mold in the semiautomatic mode M1 and the mold opening amount S2 of the mold in the fully automatic mode M2. And set
For each molding cycle, when the mold opening process starts, a first step of determining a distinction between the semi-automatic mode M1 and the fully automatic mode M2,
When it is determined to be the semi-automatic mode M1, an operation including a second step of performing mold opening with a mold opening amount as S1 ,
A mode M3 indicating that the mold opening amount S1 is used is set together with the setting of the semi-automatic mode M1, and the first step is performed between the first step and the second step. When it is determined as the semi-automatic mode M1, the third step of determining whether or not the mode M3 using the mold opening amount S1 is executed. As a result of the determination, the mode M3 using the mold opening amount S1 is determined. Performing the second step when determined,
Further, a fourth step of determining whether the mold opening amount S1 is larger than the mold opening amount S2 between the third step and the second step,
When it is determined in the first step that the mode is the fully automatic mode M2, or when it is determined that the mode is not the mode M3 in which the mold opening amount S1 is used in the third step, or the fourth step In step 5, when it is determined that the mold opening amount S1 is smaller than the mold opening amount S2, the mold opening amount is set to S2, and the mold opening is performed. A sixth step of determining whether or not the automatic mode M2 is performed is executed, and when it is determined that the automatic mode M2 is the full automatic mode M2, the mold closing process returns to the mold closing step. Control method.

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