JP2010012638A - Take-out method and take-out apparatus of molded product and mold used for this take-out method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a take-out method and a take-out apparatus of a molded product that solve the problem that the conventional take-out apparatus, when fitted with a heating means such as a heater for the suction pad to take measures against the marks of the suction pad on the molded product, leads to a complexity of the take-out apparatus and to a cost rise, and to provide a mold. <P>SOLUTION: In taking out the molded product P from the molds 14, 16 of an injection molding machine using the take-out apparatus 25 equipped with the suction pad 31, the pad 31 is put into contact with the injection molding machine body 15, 17 or the molds 14, 16 and then stuck by suction to the molded product P to take it out of the mold 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a molded product take-out method, a take-out device, and a mold used in the take-out method for taking out a molded product from a molding die of an injection molding machine using a take-out device provided with a suction pad.

As a device relating to a molded product take-out device for taking out a molded product from a molding die of an injection molding machine using a take-out device provided with a suction pad, those described in Patent Document 1 and Patent Document 2 are known. Patent Document 1 describes an example in which an electric heating body is detachably disposed on a suction pad that sucks and conveys a resin workpiece. It is described that the temperature of the resin work and the temperature of the suction pad are made substantially equal to avoid deformation of the resin work or adhesion of traces of the suction pad. Also in Patent Document 2, the suction cup is heated with a heater to eliminate the difference between the temperature of the molded disk substrate and the temperature of the suction cup, and when the disk substrate is peeled off from the mold stamper, It is described that the generation of warp and warp is prevented, and that a hot air blowing nozzle is provided in the take-out device, and the molded product is heated and taken out by suction.

However, in both Patent Document 1 and Patent Document 2, it is necessary to provide a heating means such as a heater on the suction pad of the take-out device, and the take-out device becomes complicated and costs increase due to the heating means such as the heater and its wiring. There was a problem of being connected. In addition, regarding temperature control when a heater is provided, if a closed loop control is performed by providing a temperature sensor, it will lead to a significant cost increase, and if the temperature of the heater or hot air is simply controlled by open loop control, the temperature will be optimal. There was a problem that it was difficult to control.

Utility Model Registration No. 2524577 (Claim 1, Problems to be Solved by the Invention, Effects of the Invention, FIG. 2) JP-A-4-334424 (Claims 1, 0012, 0013, FIG. 1)

In the present invention, in view of the above problems, in the conventional take-out device, if a heating means such as a heater is provided on the suction pad for the countermeasure against the trace of the suction pad on the molded product, the take-out device becomes complicated and leads to an increase in cost. It is an object of the present invention to provide a molded product take-out method, a molded product take-out device, and a molding die used in the take-out method, which solve the problem of the problem.

The method for taking out a molded product and the apparatus for taking out a molded product according to the present invention provide a method for removing the suction pad from the injection molding machine main body or the molding machine when taking out the molded product from the molding die of the injection molding machine using the take-out device provided with the suction pad. After making it contact | abut to a metal mold | die, it is made to adsorb | suck to the said molded article and it takes out from a metal mold | die.

The method for taking out a molded product and the apparatus for taking out a molded product according to the present invention are such that when a molded product is taken out from a molding die of an injection molding machine using a take-out device having a suction pad, After contacting the mold, it is adsorbed to the molded product and taken out from the molding die, so that the take-out device becomes complicated and does not lead to an increase in cost, and there is little or almost no trace of the suction pad. The molded product can be taken out in a state where it is not.

A method for taking out a molded product, an apparatus for taking out a molded product, and a molding die according to this embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a view showing the operation of the molded product take-out device of the present embodiment. FIG. 2 is a plan view of the molded product take-out device of the present embodiment.

The injection molding machine 11 of this embodiment is a molding machine that molds the light guide plate P by injection compression molding. The injection molding machine 11 includes an injection device 12 and a mold clamping device 13. The mold clamping device 13 includes a fixed plate 15 to which the fixed mold 14 is attached, a movable plate 17 to which the movable die 16 is attached, a mold clamping mechanism 18 and the like.

The molding die is for a light guide plate capable of simultaneously molding two light guide plates P by injecting molten resin into cavities 19 and 19 formed when the fixed die 14 and the movable die 16 are closed. This is a molding die. The fixed mold 14 includes a main mold (main body part) 14 a attached to the fixed platen 15 and a cavity mold 14 b that forms a cavity 19. A sprue bush 14c is provided through the main mold 14a and the cavity mold 14b. The movable mold 16 also includes a main mold (main body portion) 16a and a cavity mold 16b for forming cavities 19 and 19. The movable mold 16 is provided with an ejector and a movable gate cutter (not shown) so that the light guide plate P and the runner R or sprue S can be separated in the mold. A temperature control hose 20 to which a temperature control medium such as water whose temperature is adjusted is supplied from an external temperature control device (not shown) is connected to the fixed mold 14 and the movable mold 16.

Further, a metal plate 21 is fixed to the opposite side of the main mold 16a of the movable mold 16 in a direction perpendicular to the mold opening / closing direction. The metal plate 21 is a part of a molding die, and is used for abutting the suction pad 31 of the take-out device 25 before sucking and taking out the molded product. The metal plate 21 has a contact portion 22 formed of a flat surface or a mirror surface on the fixed mold 14 side. The area of the abutting portion 22 of the metal plate 21 is an area where all the suction pads 31 of the take-out device 25 described later can abut. The metal plate 21 needs to be capable of raising the temperature higher than normal temperature, and is excellent in thermal conductivity such as stainless steel, copper, aluminum, etc. in addition to iron, and is formed from an easily available metal. Further, a temperature control hose 20 is provided on the back surface of the metal plate 21 so as to contact the main mold 16a of the movable mold 16. It is more desirable that the temperature control hose 20 at the portion in contact with the metal plate 21 is made of metal. And since the temperature control medium of 50-130 degreeC distribute | circulates in the temperature control hose 20 in order to cool the light-guide plate shape | molded in the cavity 19, the metal plate 21 does not require a separate heating apparatus separately, Heated by the temperature control medium of the temperature control hose 20. Since the metal plate 21 has a small heat capacity, heat from the molding die (mainly heat released from the molten resin) is transmitted even in a type that is not in contact with the temperature control hose 20, and the temperature can be raised to a constant temperature. .

Next, with reference to FIG. 1 and FIG. 2, the taking-out apparatus 25 provided with the suction pad 31 which takes out the light-guide plate P which is a molded product from the shaping die with which the injection molding machine 11 was attached is demonstrated. The take-out device 25 is fixed to the upper surface of the fixed platen 15 on the non-operation side (the side opposite to the operation plate). The main body 26 of the take-out device 25 is provided with a rotating shaft 27, and a substantially arc-shaped arm 28 as shown in FIG. 1 is fixed to the rotating shaft 27 in a direction orthogonal to the rotating shaft 27. The rotary shaft 27 is provided so as to be movable back and forth in the axial direction (mold opening / closing direction) by a first servo motor (not shown) incorporated in the main body 26 and a ball screw mechanism, and a first not shown (not shown) also incorporated in the main body 26. The shaft is rotationally driven by the servo motor 2 so that the arm 28 can be turned and stopped with high accuracy. Therefore, the take-out device 25 is called a swing arm type take-out device.

A chuck 29 for gripping the sprue S is disposed on the distal end side of the arm 28 of the take-out device 25. An attachment plate 30 to which the suction pad 31 is attached is attached to the distal end side of the arm 28 at a certain angle with respect to the arm 28. Three suction pads 31 are attached to one side and the other side of the mounting plate 30 on the movable platen 17 side toward the movable platen 17 side. The suction pad 31 is provided with a rubber bellows portion in front of the main body, has a rubber cup-shaped suction surface 31a at the tip thereof, and is fixed to the mounting plate 30 via a spring 31b. The suction pad 31 is connected to the vacuum device via an air tube (not shown). In the present embodiment, the suction surface 31a of the suction pad 31 has a diameter of 8 to 12 mm. The diameter of the adsorption surface 31a is appropriately selected according to the size and weight of the light guide plate. As the material of the suction pad 31, heat-resistant silicon rubber, fluorine rubber, urethane rubber, nitrile rubber, or the like is used. The rubber of the suction pad 31 may be a sponge-like porous rubber. The suction pad 31 of the present invention is not provided with a heater or the like that is a heating device.

Although not shown, on the side of the injection molding machine 11, a swing arm-type delivery device (not shown) that receives the light guide plate P carried out from the take-out device 25 at the delivery position C and conveys it to a belt conveyor (not shown) or the like. Is arranged.

Next, molding of the light guide plate P by the injection molding machine 11 and extraction of the light guide plate P by the take-out device 25 arranged in the injection molding machine 11 will be described. The resin used in this embodiment is polycarbonate, and a temperature control medium of 50 to 130 ° C. is sent to each part of the molding die via the temperature control hose 20. The metal plate 21 of the molding die is also heated to 50 to 130 ° C. by the heat from the injected molten resin and the heat from the temperature control hose 20. The mold clamping mechanism 18 is operated, and the movable mold 16 attached to the movable plate 17 is brought into contact with the fixed mold 14 attached to the fixed plate 15 to close the mold, and the cavities 19 and 19 are formed. It is formed.

Next, the polycarbonate molten resin at 350 to 380 ° C. is injected from the injection device 12 into the cavity through the sprue bush 14c. In this embodiment, since injection compression molding is performed, the molten resin injected into the cavity 19 is compressed by the mold clamping mechanism 18. Further, the compression is performed, and a movable gate cutter (not shown) is advanced in the latter half, and the molten resin in the runner R and the cavity 19 is separated. And it cools with the said temperature control medium, continuing the compression to the molten resin in the cavity 19 by a mold clamping mechanism.

While the light guide plate P is cooled in the cavity 19, the take-out device 25 fixes the suction pad 31 to the main mold 16 a of the movable mold 16 at the standby position A indicated by the solid line in FIGS. 1 and 2. The abutting portion 22 of the metal plate 21 is awaited. The suction pad 31 is heated by heat from the metal plate 21. The time for which the suction pad 31 is brought into contact with the metal plate 21 is more preferably 2 seconds or more although it depends on the temperature of the metal plate 21 and the temperature of the molded product such as the light guide plate P. Therefore, in the case of a short cycle molded product in which the molding cycle is determined by the operating speed of the take-out device 25, a desirable effect cannot be obtained.

Next, after the mold clamping mechanism 18 is operated and the pressure is released, the movable platen 17 and the movable mold 16 are moved to open the mold. When the mold opening is started, the sprue S including the runner R bites into the biting portion formed at the tip of the protruding pin of the movable mold 16, so that the sprue S including the runner R is the sprue bush of the fixed mold 14. 14c. Also, with respect to the light guide plate P, since the cavity 19 of the movable mold 16 has a concave mold shape, the mold is opened while being held by the movable mold 16. At this time, release air may be ejected from the molding die.

Further, by opening the mold, the suction pad 31 of the take-out device 25 is separated from the contact portion 22 of the metal plate 21. When the mold opening is completed or in the middle of the mold opening, the rotating shaft 27 of the take-out device 25 is rotated clockwise in FIG. 1, the suction pad 31 is moved to the front surface of the light guide plate P of the movable mold 16, and the chuck 29 is simultaneously moved. The sprue S is moved to a position where it can be sandwiched. Then, the rotary shaft 27 is advanced to move to the suction position B where the suction pad 31 is in contact with the light guide plate P, and a negative pressure is created between the suction surface 31a of the suction pad 31 and the light guide plate P by air suction. The light guide plate P is adsorbed. Air suction is performed before contact with the light guide plate P, so that the light guide plate P is sucked simultaneously with the contact of the suction pad 31. The suction force of air suction is about −50 to −120 kpa, and the suction force is relatively weak so that the light guide plate P having a high temperature immediately after molding does not have a suction mark. Further, as described above, the suction pad 31 has a temperature close to the temperature of the light guide plate P immediately after molding. Therefore, the portion of the light guide plate P with which the suction pad 31 comes into contact is not rapidly cooled. Adhesion marks are difficult to stick to. Further, since the rubber of the suction pad 31 is also softened by heating, no trace is left on the light guide plate P even if the suction pad 31 is brought into contact with the rubber a little faster. Further, the chuck 29 is operated simultaneously with the suction of the light guide plate P by the suction pad 31, and the sprue S is gripped.

When the light guide plate P is sucked by the suction pad 31 and the sprue S including the runner R is gripped by the chuck 29, the take-out device 25 slightly moves the rotating shaft 27 and the arm 28 slightly in the mold closing direction again. The light guide plate P is released from the cavity forming surface of the movable mold 16 and the sprue S including the runner R is removed from the biting portion. Next, the rotating shaft 27 of the take-out device 25 is rotated counterclockwise in FIG. 1 and moved to the delivery position C indicated by the alternate long and short dash line. At the delivery position C, the sprue is dropped and guided to the delivery device (not shown). The light plate P is delivered. Therefore, it is not necessary to cut the light guide plate P, the runner R, or the sprue S in a post-process after molding.

In addition, when adjusting the temperature of the suction pad 31, it adjusts by at least one of the following. As a first measure, the temperature of the suction pad 31 is adjusted by adjusting the time during which the suction pad 31 contacts the contact portion 22 of the metal plate 21 or the time after the contact. Of course, if the contact time becomes longer, the temperature of the suction pad 31 can be raised in the range up to the same as the temperature of the metal plate 21. Moreover, if the time after contact is short, the temperature drop of the suction pad 31 can be prevented, and if the time after contact is long, the temperature of the suction pad 31 can be controlled low. Further, as a second measure, the temperature of the suction pad 31 is adjusted by selecting a portion having a high or low temperature in the contact portion 22 including the metal plate 21 and causing the suction pad 31 to contact. . In the metal plate 21, the temperature is generally lower on the outer side than on the base side. As a third measure, the temperature of the suction pad 31 is adjusted by adjusting the temperature of the contact portion 22 of the metal plate 21.

Next, another embodiment will be described with reference to FIG. In another embodiment shown in FIG. 3, the area of the main mold 42a of the movable mold 42 (the area of the surface perpendicular to the mold opening / closing direction) is the area of the cavity mold 42b (the surface of the surface perpendicular to the mold opening / closing direction). The area is larger than a certain amount. A contact portion 44 having a space in which the suction pad 43 of the take-out device 41 can be contacted is provided on the surface of the main mold 42a on the fixed mold side. With this configuration, it is not necessary to attach a metal plate separately to the main mold 42a. The take-out device 41 of another embodiment is a swing arm type that can operate at a high speed, but depending on the turning structure of the portion to which the suction pad 43 of the take-out device 41 is attached, the side surface of the movable mold 42 or a fixed mold (not shown). The suction pad 43 may be brought into contact with the contact portion.

Next, still another embodiment will be described with reference to FIG. The take-out device 51 of still another embodiment shown in FIG. 4 is a combination of mechanisms that move linearly by an actuator. In the take-out device 51, the upper transfer portion 52 can move in a direction perpendicular to the mold opening / closing direction by a servo motor and a ball screw (not shown) from the center of the upper surface of the fixed plate 58 toward the side opposite to the operation side. Yes. The transfer unit 52 has a first air cylinder 54 that moves the suction pad 53 and the like in the horizontal direction, and a second air cylinder 54 that is attached to the rod 54a of the first air cylinder 54 and moves the suction pad 53 and the like in the vertical direction. An air cylinder 55, a mounting plate 56 attached to the rod 55a of the second air cylinder 55 and capable of changing the direction of the suction pad 53 by a motor (not shown), a suction pad 53 provided on the mounting plate 56, and the like are provided. It has been.

The suction pad 53 can be moved in the three-dimensional direction by the three-axis operation of the servo motor, the first air cylinder 54 and the second air cylinder 55. Further, the orientation of the suction pad 53 is changed by a motor, and the posture of the molded product taken out in the vertical direction can be changed in the horizontal direction and placed on a conveyor or the like. On the other hand, the outer surface of the molding die 57 is always kept at a temperature higher than normal temperature by the temperature control medium sent from the temperature control device.

During molding, during the cooling process from injection to mold opening, the take-out device 51 has the suction pad 53 in contact with the contact portion 57a on the upper surface of the molding mold 57 (fixed mold or movable mold). Waiting while the temperature is kept high. When the mold is opened, the first air cylinder 54 and the second air cylinder 55 of the take-out device 51 are operated, and the angle of the mounting plate 56 to which the suction pad 53 is attached is rotated so that the suction pad is formed into the molded product P1. Take it out by direct adsorption. In this case, since the temperature difference between the temperature of the molded product P1 and the suction pad 53 is small, the suction mark of the suction pad 53 is difficult to adhere to the molded product P1. The same can be done even if a multi-axis robot is adopted as the take-out device.

The present invention is not enumerated one by one, but is not limited to that of the above-described embodiment, and it goes without saying that those skilled in the art also apply modifications made in accordance with the spirit of the present invention. is there. The molded product is not limited to the light guide plate P and can be applied to all molded products. In particular, in the case of high-density discs such as Blu-ray Disc (registered trademark), flatness of the clamping area and its inner part is required, but the adsorption trace is reduced by adsorbing such part with a suction pad heated to high temperature. And the flatness of the portion can be increased. Large molded products such as bumpers, outer shells of electrical appliances, containers, etc. have a long molding cycle, and it is difficult to adsorb only the runner part. It is. In addition, when the suction surface of the molded product is not flat, the arrangement of the suction cups and the abutting part that makes the suction cups contact when heated are other than the corresponding plane.

Further, the contact portion that is contacted when the suction pad of the take-out device is heated may be an injection molding machine main body instead of a molding die. Examples of the injection molding machine main body include a fixed platen, a movable platen, a heating cylinder, and a bed. Even when the abutting portion is provided on the fixed platen and the movable platen, there are a case where a metal plate for abutting the sucker is attached and a case where the abutting portion is provided on the main body such as the fixed platen. As for the temperature rise of the abutting portion, the temperature of the fixing plate or the like is raised to the temperature required for heating the suction pad by the heat from the molding die, and the temperature control hose is abutted or provided inside In some cases, the temperature of the stationary platen may be increased.

It is a figure which shows the action | operation of the taking-out apparatus of the molded article of this embodiment. It is a top view of the taking-out apparatus of the molded product of this embodiment. It is a figure which shows the action | operation of the taking-out apparatus of another embodiment. It is a figure which shows the action | operation of the taking-out apparatus of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Injection molding machine 14 Fixed mold 16,42 Movable mold 14a Main mold 21 Metal plate 22 Contact part 25,41,51 Extraction device 31,43,53 Adsorption pad P Light guide plate S Sprue

Claims (3)

In the method of taking out a molded product that takes out a molded product from a molding die of an injection molding machine using an extraction device equipped with a suction pad,
A method for removing a molded product, comprising: bringing the suction pad into contact with an injection molding machine main body or a molding die; In a molded product take-out device for taking out a molded product from a molding die of an injection molding machine using a take-out device equipped with a suction pad,
An apparatus for taking out a molded product, wherein the suction pad is brought into contact with an injection molding machine main body or a molding die, and is then sucked into the molded product and taken out from the molding die. In the molding die used for the method of taking out the molded product, which takes out the molded product from the molding die of the injection molding machine using the take-out device provided with the suction pad,
2. The molding die according to claim 1, wherein the molding die is provided with a contact portion for contacting the suction pad before the molded product is sucked and taken out.

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