JP2003291186A - Operating method for injection molding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a time for taking out a product by quickening start of moving of a product taking-out arm, advancing of an ejection pin and moving of the product taking-out arm which holds the product. <P>SOLUTION: An operating method for an injection molding device is characterized by starting moving a product taking-out arm to gaps between a fixed mold and a movable mold on the way of mold opening, starting projecting a product during the movement of the taking-out arm and starting moving the product taking-out arm on the way of retreat of an ejection pin by holding the product with the product taking-out arm. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating an injection molding device when a product molded by the injection molding device is taken out of a mold.

[0002]

2. Description of the Related Art A conventional method will be briefly described with reference to the following drawing. 6 (a) and 6 (b) are explanatory views of a method of operating a conventional injection molding apparatus. (A): First, the mold 101 (fixed mold 102, movable mold 103) is filled with resin by the extruder 104, and then the movable mold 103 is opened by a distance S1. The distance S1 at that time is always constant even if the molds are different. Continuously, unloader 105
After lowering, the chuck 106 of the take-out machine 105 is opened, and the take-out machine 105 is moved to the product 107 side as shown by an arrow a. Subsequently, after projecting the projecting pin 108, the product 107 is gripped by the chuck 106.

(B): After gripping the product 107, the projecting pin 108 is retracted, then the take-out machine 105 is retracted to the fixed mold 102 side, and finally the take-out machine 105 is raised. These operations will be supplementarily described with the following figure.

FIG. 7 is a time chart for taking out a conventional product. After the opening of the movable mold 103 is completed at time T2, the take-out machine 105 starts descending at time T2. After the lowering of the take-out machine 105 is completed at time T3, opening of the chuck 106 is started at time T3, and after the completion of opening (time T4), the advance of the take-out machine 105 is started at time T4. Continuously, each operation is time T5 to T10
At the same time, each operation is started at about the same time as T5 to T9. Here, from the start of opening the movable mold 103 (T1), the lifting of the take-out machine 105 is completed (T1).
The take-out cycle time was set to So when the take-out cycle time was set to 0). By setting each operation in this way, a molded product can be obtained.

[0005]

In the above molding method,
Although the quality of the product 107 can be secured, the efficiency of the take-out work was poor. As a method for improving the efficiency of the extraction work, it is possible to increase the speed of each operation to shorten the time, but here, in order to ensure quality, the speed of each operation is kept unchanged and the extraction cycle time So is set. It was necessary to shorten it to improve efficiency.

Therefore, an object of the present invention is to provide an operating method of an injection molding apparatus which shortens the take-out time.

[0007]

In order to achieve the above object, the first aspect of the present invention is to move the product take-out arm between the fixed mold and the movable mold while the mold is being opened and to move the product take-out arm. It is characterized in that the product ejecting arm is started, the product ejecting arm grips the product, and the ejecting pin starts the movement of the product ejecting arm in the middle of retreating.

By starting the movement of the product taking-out arm without waiting for the completion of the mold opening, the movement of the product taking-out arm can be started earlier. By starting the ejection of the product while the product take-out arm is moving, the start of the advance of the ejection pin is hastened. By starting the movement of the product take-out arm without waiting for the completion of the retraction of the projecting pin, the start of the movement of the product take-out arm that grips the product. Therefore, the ejection cycle time is shortened.

The second aspect is characterized in that the mold opening distance is set according to the size of the product. The product size is a value of the product undercut with respect to the moving direction of the product take-out arm. When this undercut is small, the mold opening distance is also small, so that the time required for mold opening of the mold can be shortened and the start of movement of the product take-out arm can be made earlier.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals. FIG. 1 is a side view of an injection molding apparatus and a take-out machine used in an operating method according to the present invention and a first explanatory view of the operating method. The injection molding device 10 includes an extruder 11, a mold clamping mechanism 12, and a control device (not shown) that controls the extruder 11 and the mold clamping mechanism 12. 13 is a die attached to the mold clamping mechanism 12, and 14 is a take-out machine.

The mold 13 comprises a fixed mold 15 and a movable mold 16 which fits into the fixed mold 15. The movable mold 16 has a projecting means 17, and a cylinder 18 of the projecting means 17 projects and retracts a pin 19. Reference numeral 21 denotes a mold surface of the movable mold 16.

The mold clamping mechanism 12 slides on a fixed platen 23, tie bars 24 ... Attached to the fixed platen 23 (... indicates a plurality, the same applies hereinafter), and these tie bars 24. The movable platen 25 is attached so that the movable platen 25 is slid as shown by an arrow to close the movable mold 16 attached to the movable platen 25 with a predetermined pressure. Further, the movable platen 25 is slid in the direction of the arrow and returned to the position indicated by the chain double-dashed line by the mold opening amount Sm as the mold opening distance.
The mold of 6 is opened.

The mold opening amount Sm is a value set according to the size L of the product 35 (see FIG. 2), and is movable so that the product can be taken out without interfering with the mold surface 21 when the product is taken out by the take-out machine 14. This is the distance to move the mold 16.
The size L is an undercut value with respect to the operation direction of the take-out machine 14, and varies depending on the shape of the product.

The take-out machine 14 includes a product take-out arm 31.
And a chuck 32 attached to this product take-out arm 31
And these product take-out arm 31 and chuck 3
And a control device (not shown) for controlling the control unit 2. The position of the take-out machine 14 shown in FIG. 1 is both the standby position and the upper limit.

Next, a method of operating the injection molding apparatus according to the present invention will be described. First, the injection molding apparatus 10 fills the mold 13 with resin. Specifically, after the resin raw material is melted (plasticized) by the extruder 11, a predetermined amount of the melted resin is injected into the mold 13. After injection, hold movable mold 16 for a predetermined time
To open the mold.

FIG. 2 is a second explanatory view of the operating method of the injection molding apparatus according to the present invention. While the mold is being opened, the product take-out arm 31 starts to descend as shown by the arrow, and the product take-out arm 31 is inserted between the movable mold 16 and the fixed mold 15 which are being opened. Specifically, before reaching the mold opening amount Sm, for example, before the distance Ss, the product take-out arm 31 is moved to a position immediately below the standby position and close to the movable mold 16. In addition, when the mold is opened, the fixed mold 15 is used to remove the product 3
At the same time as 5 is separated, it is kept in close contact with the movable mold 16.

3 (a) and 3 (b) are third explanatory views of the operating method of the injection molding apparatus according to the present invention. (A): The protrusion of the product 35 is started while the product take-out arm 31 is descending. Specifically, the opening of the chuck 32 is completed as shown by the arrow while the product take-out arm 31 is descending, while the projecting means 17 of the projecting means 17 is being opened while the product take-out arm 31 is descending. Cylinder 18
Then, the projecting pin 19 is moved forward as shown by the arrow to start separating the product 35 from the mold surface 21 of the movable mold 16.

(B): The product take-out arm 31 continues to descend, and after the product take-out arm 31 has entered the lower limit,
The releasing operation of the product 35 by the protrusion of the protrusion pin 19 is completed as shown by the arrow.

4 (a) and 4 (b) are fourth explanatory views of the method of operating the injection molding apparatus according to the present invention. (A): After gripping the product 35 by the product take-out arm 31, the cylinder 18 projects and the retracting of the pin 19 is started as shown by the arrow.

(B): The raising of the product take-out arm 31 is started as indicated by the arrow while the protruding pin 19 is being retracted as indicated by the arrow. At that time, the product 35 is lifted up straight from the gripped position. Finally, the product takeout arm 31 is returned to a predetermined standby position (see FIG. 1), and at the same time when one cycle of takeout is completed, the mold closing is restarted. Although not shown in the figure, the product take-out arm 31 is moved from the standby position to a predetermined position to flow the product 35 in the downstream stroke.

Next, a method of operating the injection molding apparatus according to the present invention will be described with reference to a chart. FIG. 5 is a time chart of the operating method of the injection molding apparatus according to the present invention. The mold opening of the mold 13 is started at time K1, and the mold is being opened (time K1 to
In K2), the product take-out arm 31 starts to descend at time H1 and moves between the fixed mold and the movable mold, and the chuck 32 opens at time C1 while the product take-out arm 31 descends (time H1 to H2). It starts, the opening is completed at time C2, and the product take-out arm 31 is descending (time H1 to H
2) The forward movement of the projecting pin 19 is started at time P1, the movement (lower limit) of the product take-out arm is completed at time H2, and then the projecting pin 19 is completed projecting at time P2.
Chuck 32 at time C3 almost at the same time as time P2
The gripping of the product is started at time C4, and the gripping is completed at time C4. At about the same time as this time C4, the protruding pin 19 starts retracting at time P3, and the protruding pin 19 is retracting (time P4).
3 to P4) to raise the product take-out arm 31 in time H3
Start at and complete the rise (upper limit) at time H4. The take-out cycle time in this operating method is Sn (Sn <So)
Is.

As a result, in the method of operating the injection molding apparatus of the present invention, the start of the descending of the product take-out arm 31 is accelerated, the opening operation of the chuck 32 is completed while the product take-out arm 31 is descending, and the projecting pin 19 is moved forward. Since the start of the product pick-up arm 31 starts earlier and the start of raising the product take-out arm 31 earlier, the take-out cycle time can be shortened. Therefore, the take-out time can be shortened.

Further, in the operating method of the injection molding apparatus, the product take-out arm 31 is lowered to a position right below the standby position and the product 35 is removed.
Since (FIG. 4) is gripped, it is possible to omit the forward movement time and the backward movement time of the product takeout arm 31 toward the product 35 side, and the takeout time can be shortened.

By setting the mold opening amount Sm according to the size L of the product 35 shown in FIG. 1, it is possible to shorten the mold opening time (time K1 to K2) of the mold 13 shown in FIG. Start the lowering of the take-out arm 31 at time H
It is possible to make it earlier than the position (timing) of 1 and to further shorten the take-out time.

The injection molding apparatus 10, the take-out machine 14 and the mold 13 shown in FIG. 1 according to the embodiment of the present invention are examples. The control configuration is arbitrary. For example, each operation may be executed by the information of the sensor, the operation may be started and completed by the information of the timer, and the sensor and the timer may be combined.

[0026]

The present invention has the following effects due to the above configuration. In claim 1, the product take-out arm starts moving between the fixed mold and the movable mold during opening of the mold, the product ejecting starts while the product take-out arm is moving, and the product take-out arm grips the product. , The ejection pin starts moving while the product take-out arm is moving backward. As a result, the start of the movement of the product take-out arm is accelerated, the start of the advance of the projecting pin is accelerated, and the start of the movement of the product take-out arm that grips the product is accelerated, so that the take-out time can be shortened.

In the second aspect, since the mold opening distance is set according to the size of the product, the time required for the mold opening of the mold can be shortened, and the movement of the product take-out arm can be started earlier. , The take-out time can be further shortened.

[Brief description of drawings]

FIG. 1 is a side view of an injection molding apparatus and a take-out machine used in an operation method according to the present invention and a first explanatory view of the operation method.

FIG. 2 is a second explanatory view of the operating method of the injection molding apparatus according to the present invention.

FIG. 3 is a third explanatory view of the operating method of the injection molding apparatus according to the present invention.

FIG. 4 is a fourth explanatory view of the operating method of the injection molding apparatus according to the present invention.

FIG. 5 is a time chart of the operating method of the injection molding apparatus according to the present invention.

FIG. 6 is an explanatory diagram of a method of operating a conventional injection molding device.

FIG. 7: Time chart of conventional product removal

[Explanation of symbols]

10 ... Injection molding device, 13 ... Mold, 15 ... Fixed mold, 1
6 ... Movable mold, 19 ... Projection pin, 31 ... Product take-out arm, 35 ... Product, L ... Product size, Sm ... Mold opening distance (mold opening amount).

Continued front page    F-term (reference) 4F202 AR07 CA11 CB01 CL42 CM02                       CM12                 4F206 AR07 JA07 JN41 JQ81

Claims (2)

[Claims] 1. A product take-out arm starts to move between a fixed mold and a movable mold during opening of a mold, and a product pick-up arm starts to project while the product take-out arm moves, and the product take-out arm grips the product. Then, the method for operating the injection molding apparatus is characterized in that the ejection pin starts moving while the product ejecting arm is retracting. 2. The method of operating an injection molding apparatus according to claim 1, wherein the mold opening distance is set according to the size of the product.