JP2002254482A - Control method for injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that molded products are scattered when all of molded products are released at the same time by an ejector to rush in the gaps between molds ready to be closed to damage the molds and a place where the molded articles are placed is scattered over a wide range. SOLUTION: In a control method for an injection molding machine having the an ejector for collectively taking out the molded products of the molds equipped with a plurality of cavities, the drive part of the ejector is controlled so that the position releasing the respective molded products from a chuck becomes same with respect to the respective molded products.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating a molded product taken out of a mold when performing multi-cavity injection molding using a mold having a plurality of cavities.

[0002]

2. Description of the Related Art A plurality of molded products taken out by a take-out machine at the same time have been simultaneously released from a chuck.

[0003]

According to the above-mentioned conventional method, when the positions of the molded products released from the chuck of the unloader are vertically aligned, the upper molded product is replaced by the lower molded product or the chuck. They collide and splatter, and in the worst case rush between closed molds, damaging them. Further, when the position of the molded product released from the chuck of the unloader is horizontal or nearly horizontal, the place where the molded product is placed is wide, and the effective use of the molding work site is hindered.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a control method for an injection molding machine having an unloader for unloading a molded product molded by a mold having a plurality of cavities.
By controlling the drive unit of the unloader so that the position where the molded product is released from the chuck is the same for each molded product, all molded products can be placed in a single location for one molded product without scattering of molded products Was to be accommodated.

[0005]

Embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1, 2 and 3 show a fixed plate 1 which is a part of a mold clamping device of an injection molding machine and a fixed die 2 attached thereto. FIG. 4 is a cross-sectional view as viewed from between a fixed mold 2 and a movable mold when separated. The fixed platen 1 is fastened to a mold clamping force generator (not shown) by four tie bars 4 which slidably pass through a movable plate (not shown). The unloader 5 is provided on the upper surface of the fixed platen 1 and has a driving unit
An arm 6 that enters between the opened fixed mold 2 and the movable mold, a chuck 8 that is attached to the tip of the arm 6 and vacuum-adsorbs molded products (disk substrates 9 and 10), and an injection molding machine. The control unit 12 controls the driving unit 7 and the chuck 8 in relation to the operation. The unloader 5 has various structures other than this example. For example, instead of the arm 6, a girder that supports a rod for vertically moving the chuck 8 so as to be able to move horizontally may be used. The chuck 8 is preferably a vacuum suction device made of rubber or plastic. Depending on the shape of the molded product, a chuck-shaped chuck driven by an air cylinder or the like is used.

In this embodiment, a case will be described in which the molded products are disk substrates 9 and 10 such as CDs and DVDs, and are molded as two pieces. The fixed mold 2 has cavities 3 and 3 disposed horizontally, and the movable mold also has a cavity portion corresponding to the cavities 3 and 3, and the fixed mold 2 and the movable mold are combined to form a disk substrate. Is formed. When the movable mold is separated from the fixed mold 2, the disk substrates 9, 10 formed in the cavities are held in the cavities of the movable mold and move to predetermined positions.

FIG. 3 shows a stand-by position of the arm 6, in a state in which the removal and transfer of the molded product of the previous shot have been completed and waiting for the removal of the molded product of the current shot. When the movable platen is separated from the fixed platen after the injection filling / cooling is completed, the control device 12 transmits a signal to the drive unit 7 to rotate the arm 6 in the counterclockwise direction, and the chucks 8, 8 Let them be located at the center respectively. Next, the arm 6 is moved in front of the rotation axis in the axial direction (the front direction in the drawing), and the disk substrates 9 and 10 are sucked and held by the chuck. Arm 6
Is returned to its original position in the axial direction and rotated clockwise to the position shown in FIG. FIG. 1 shows a delivery position for transferring the disk substrates 9 and 10 to a post-process such as sputtering or coating.

When the quality of the disk substrate does not reach the standard at the time of molding startup, or when the post-process is stopped, there is no need to transport the disk substrates 9 and 10 to the post-process. 6 rotates counterclockwise again while the disk substrates 9, 10 are attracted to the chucks 8, 8, and stops at the position shown in FIG. FIG. 2 shows a state in which the disk substrate 9 closer to the die among the disk substrates 9 and 10 that have become unnecessary for the above reason is housed in the box 11. Drive unit 7
The controller 12 detects that the disk substrate 9 has reached a predetermined position by the rotation angle of the arm 6 and performs positioning. At that position, the vacuum of the chuck 8 holding the disk substrate 9 is released, and the disk substrate 9 is dropped onto the box 11.

Next, the driving unit 7 and the control device 12
Is further rotated counterclockwise to position the disk substrate 10 so as to be the same as the position of the disk substrate 9 in FIG. This state is shown in FIG. At the arm position in FIG. 3, the vacuum of the chuck 8 that has held the disk substrate 10 is released, and the disk substrate 10 is dropped onto the box 11. By this time, the next shot has been formed, and the unloader 5 has the next shot disk substrate 9,
Wait for removal of 10.

Although the above operation has been described in connection with the example of forming a disk substrate, it is needless to say that the present invention is not limited to this and can be applied to the formation of general molded products. For example, if the molded product is not a disk substrate and does not require a post-process, it is not necessary to rotate the arm to the arm position shown in FIG. 1, and only the operation at the position shown in FIGS. 2 and 3 is sufficient. In the box 11, good products are stored instead of discarded products.

When the molded articles are the disk substrates 9 and 10, the unnecessary disk substrates 9 and
The discard operation of 10 is performed for a predetermined number of molding shots set by the setting device 13 provided in the control device 12. By doing so, it is possible to minimize the amount of discarding work and the number of discarded disc substrates at the start of molding.

[0012]

As described above, according to the present invention, the molded article can be conveyed in a minimum space without damaging the molded article or the mold.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of an injection molding machine showing a state in which an arm of an unloader is at a molded article delivery position for conveying a molded article to a subsequent process.

FIG. 2 is a partial cross-sectional side view of the injection molding machine showing a state when an arm of the unloader is at a first position for releasing a molded product.

FIG. 3 is a partial cross-sectional side view of the injection molding machine showing a state when an arm of the unloader is at a second position for releasing a molded product.

[Explanation of symbols]

 1 ... fixed board 2 ... fixed mold 3 ... cavity 4 ... tie bar 5 ... unloader 6 ... arm 7 ... drive unit 8 ... chuck 9, 10 ... … Disc substrate 11… Box 12… Control device 13 …… Setting device

Claims (2)

[Claims] 1. A method for controlling an injection molding machine having an unloader for unloading a molded product molded by a mold having a plurality of cavities, wherein a position at which the molded product is released from a chuck is the same for each molded product. A control method for an injection molding machine, comprising: controlling a drive unit of an unloader so that 2. The control method for an injection molding machine according to claim 1, wherein the control according to claim 1 is executed during a predetermined number of shots in starting the molding.