JP6957122B2 - Injection molding machine, molding method of molded product, and dummy mold of injection molding machine - Google Patents

Description

The present invention relates to an injection molding machine, a molding method for a molded product, and a dummy mold of the injection molding machine.

For example, as an injection molding machine capable of molding a so-called composite molded product composed of molding materials of a plurality of materials and colors, the first base plate and the second base plate arranged opposite to each other, and the first base plate and the first base plate. There are known ones having a rotating disk arranged between two bases and rotatably supported, and an ejector mechanism for ejecting a molded product (for example, Patent Document 1 and Patent Document 2). Then, in Patent Documents 1 and 2, one of the two sets of molding dies for molding the composite molded product is replaced with a dummy mold and attached, and the turntable is not rotated by only one set of molding dies. It is disclosed that molding is performed (hereinafter, the molded product molded by this is referred to as "standard molded product").

Further, in Patent Document 2, in order to protect the intermediate plate 4 and the rotary plate 40 and the mold mounting surface of the movable plate, dummy plates 6a and 6b are placed between the intermediate plate 40 and the intermediate plate 4 and the movable plate 5. A configuration for fixing with a fixing bolt 43 is disclosed.

Japanese Unexamined Patent Publication No. 2011-245661 Japanese Unexamined Patent Publication No. 2012-192734

In the prior art, when using the dummy mold, it is desired that the ejector rod for transmitting the projecting motion by the driving means of the ejector mechanism to the ejector pin of the molding mold can be easily attached to an appropriate position. rice field.

The present invention has been made to solve the above-mentioned problems, and has a simple configuration, and when a dummy mold is used, an ejector for transmitting the projecting operation by the driving means of the ejector mechanism to the ejector pin of the molding mold. The main purpose is to provide an injection molding machine to which a rod can be easily attached.

In order to solve the above problems, according to one aspect of the present invention, the first and second pedestals arranged so as to face each other are arranged between the first pedestal and the second pedestal. A rotary disk that is provided and rotatably supported and an ejector mechanism that projects a molded product are provided, and the first base plate, the second base plate, and the rotary disc can be attached with a molding mold or a dummy mold, respectively. A possible injection molding machine, one of the first base plate and the second base plate, and one surface of the rotating disc are each equipped with a molding mold, and the first base plate is attached. A dummy mold is arranged between the disc, any other of the second base, and the other surface of the rotating disc, and the ejector mechanism is attached to one surface of the rotating disc. An ejector pin for projecting a molded product from a molding die, a drive means provided on at least one of the first base plate and the second base plate to which the first dummy mold is attached, and protrusion by the drive means. It is provided with an ejector rod for transmitting the operation to the ejector pin, and the dummy mold is configured to be divided into a first dummy mold and a second dummy mold in the thickness direction, and the first dummy mold is formed. The first dummy mold is attached to either the other of the plate and the second base plate, and the second dummy mold is attached to the other surface of the rotating plate, so that the first dummy mold and the other surface are attached to the first dummy mold. An injection molding machine is provided in which the second dummy mold can be opened and closed.

According to one aspect of the present invention, when using the dummy mold, an ejector rod for transmitting the projecting operation by the driving means of the ejector mechanism to the ejector pin of the molding mold can be easily attached with a simple configuration. An injection molding machine can be provided.

It is a partial cross-sectional view shown for demonstrating one embodiment of the injection molding machine of this invention and its operation. It is an enlarged cross-sectional view shown for demonstrating the details of the 2nd dummy type. FIG. 5 is a partially enlarged cross-sectional view shown for explaining an embodiment of a process for connecting an ejector rod in the injection molding machine shown in FIG. 1. It is a partially enlarged sectional view shown for demonstrating another embodiment of a dummy type. It is a partial cross-sectional view of the turntable shown for demonstrating another embodiment of an injection molding machine.

First, an injection molding machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the following description, the opening / closing directions of the molding dies 1 and 2, the thickness direction of the dummy mold 3, and the length direction of the ejector rod 4 are all parallel to the tie bar 10 shown in FIG. 1, that is, FIG. It means the left-right direction in.

As shown in FIG. 1, in the injection molding machine of the present embodiment, the first pedestal 11 and the second pedestal 12 and the first pedestal 11 and the second pedestal 12 are arranged so as to face each other. Arranged between them, the mounting surfaces 13a and 13b (described later) can be rotated so that they can face any of the mounting surfaces 11a and 12a (described later) of the first base plate 11 and the second base plate 12. It includes a supported turntable 13 and two injection devices 14, 14. The first base plate 11, the second base plate 12, and the rotating plate 13 have mounting surfaces 11a, 12a, 13a, and 13b to which the molding dies 1 and 2 can be mounted, respectively. Then, on either the mounting surfaces 11a and 13a of the first base plate 11 and the rotating plate 13 or the mounting surfaces 13b and 12a of the rotating plate 13 and the second base plate 12, a dummy is used instead of the molding molds 1 and 2. It is also possible to attach a mold 3 (described later). Each of the injection devices 14 and 14 attaches a molding mold 1 attached to the first base plate 11 and a molding mold attached to the second base plate 12 (in the present embodiment, the dummy mold 3 is attached) when molding the composite molded product. Therefore, it can be moved so that the nozzle can be touched (not shown).

In the injection molding machine of the present embodiment, the intermediate plate 15 is inserted through the tie bar 10 provided between the first base plate 11 which is a movable plate and the second base plate 12 which is a fixed plate. The rotating plate 13 is rotatably supported on the intermediate plate 15 so that the mounting surfaces 13a and 13b can face each of the mounting surfaces 11a and 12a of the first base plate 11 and the second base plate 12. .. The second pedestal 12 is fixed on the base 16, and the intermediate pedestal 15 supporting the first pedestal 11 and the rotating pedestal 13 moves closer to and farther from the second pedestal 12. It is configured to move. Therefore, although not shown, the injection molding machine according to the present embodiment further includes opening and closing means for moving the first base plate 11 and the rotating plate 13 closer to and further from the second base plate 12, and at least. It is provided with a mold clamping means for molding the molding molds 1 and 2 attached to the first base plate 11 and the rotary plate 13. The opening / closing means can be composed of, for example, a screw shaft, a female screw member screwed into the screw shaft, and a servomotor that rotates the screw shaft in a controllable manner around the shaft. Further, the mold clamping means is provided on, for example, an annular groove formed on one end side (left end side in FIG. 1) of the tie bar 10 and a rear side surface (left side surface in FIG. 1) of the first base plate 11. , A half nut 17 that engages and disengages the annular groove of the tie bar 10, a piston (not shown) formed on the other end side (right end side in FIG. 1) of the tie bar 10, and a second base plate. A cylinder (not shown) that is provided in the above and into which the piston of the tie bar 10 is slidably fitted can be provided.

However, the injection molding machine of the present invention is not limited to the present embodiment, and the first base plate 11, the rotating plate 13, and the second base plate 12 may move relatively close to each other. For example, as in Patent Document 1, the first base plate 11 and the second base plate 12 may be configured to move close to each other and move back and forth with respect to the rotating disc 13. .. Further, the rotating disk 13 does not necessarily have to be supported by the intermediate plate 15 inserted through the tie bar 10, and the mounting surfaces 13a and 13b thereof are the mounting surfaces 11a of the first base plate 11 and the second base plate 12, respectively. , 12a may be opposed to each other, and may be supported so as to be relatively close to and retreat from the second base plate 12. Further, as the opening / closing means and the mold clamping means, other known types can be adopted.

Further, the injection molding machine is provided with an ejector mechanism 20 for projecting the molded product P from the molding molds 1 and 2. The ejector mechanism 20 in the present embodiment includes an ejector pin 21 for projecting the molded product P from the molding die 2 attached to one surface of the rotating disk 13, and a drive provided on at least the second base plate 12. A plate-shaped ejector plate provided inside the means 22 and the dummy mold 3 and moved in parallel with the opening / closing direction of the molding dies 1 and 2 by being pressed by the driving means 22 (hereinafter referred to as a dummy type ejector plate 23). And an ejector rod 4 that transmits the projecting operation by the driving means 22 to the ejector pin 21 via the dummy type ejector plate 23. Further, the ejector rod 4 in the present embodiment is configured so as to be detachably connected to the dummy type ejector plate 23 as shown in FIG. 2, and is configured in the length direction as shown in FIG. It is configured to be divided into a plurality of (two of the first ejector rod 4a and the second ejector rod 4b in the present embodiment) so that they can be connected to each other.

The mold 2 attached to the turntable 13 retracts a plate-shaped ejector plate (hereinafter referred to as a mold ejector plate 25) provided inside the mold 2 so as to be movable in the mold opening / closing direction and a mold ejector plate 25. It is provided with a spring which is an urging means 26 for urging the mold, and an ejector pin 21 attached to the molded ejector plate 25. The end surface of the ejector pin 21 is formed so as to be continuous with the cavity surface of the molding mold 2 in a state where the molding mold ejector plate 25 is retracted by the urging means 26. The arrangement of the ejector pins 21 is set at a position suitable for projecting the molded product P from the molding mold 2 and releasing the molded product P according to the shape of the molded product P and the like. Then, as shown only in FIG. 4, the ejector rod is located on the surface of the molding die 2 in contact with the rotating disk 13 at a position where the molding die ejector plate 25 can be appropriately pressed according to the arrangement of the ejector pins 21. A hole 27 for inserting the 4 is formed.

As shown in FIGS. 1 and 3, the dummy mold 3 is composed of a first dummy mold 3a and a second dummy mold 3b divided in the thickness direction thereof, and is composed of the first dummy mold 3a and the second dummy mold 3a. On the mating surfaces of the mold 3b facing each other, either the alignment pin 29 and the alignment hole 30 into which the alignment pin 29 is fitted are provided at positions corresponding to each other. The first dummy mold 3a is attached to the second base plate 12, and the second dummy mold 3b is attached to the rotating disc 13. Therefore, when the rotary disc 13 is moved backward from the second base plate 12, the first dummy mold 3a and the second dummy mold 3b can be relatively separated (opened) from each other. Further, when the rotary disc 13 is moved close to the second base plate 12, the first dummy mold 3a and the second dummy mold 3b are brought into contact with each other to form a single dummy mold 3. can. The thickness of the dummy mold 3 when the first dummy mold 3a and the second dummy mold 3b are brought into contact with each other is about the same as the average mold thickness of the molding molds 1 and 2.

The first dummy mold 3a, the second dummy mold 3b, and the turntable 13 are provided with a plurality of holes 31, 32, and 33 for inserting the ejector rods 4 at positions corresponding to each other. The ejector rod 4 selects and inserts holes 31, 32, and 33 at positions suitable for appropriately projecting and operating the ejector pin 21 of the ejector mechanism 20 arranged according to the shape of the molded product P. be able to.

Further, as shown in FIG. 2, in the present embodiment, inside the first dummy mold 3a, a dummy type ejector plate 23 that is provided so as to be movable in the mold opening / closing direction and to which the ejector rod 4 can be attached, and a dummy A spring, which is an urging means 36 for urging the mold ejector plate 23 to retract, is provided. Further, in the present embodiment, as shown only in FIG. 2, a sensor 37 for detecting that the dummy type ejector plate 23 is retracted by the urging means 36 is provided in the first dummy type 3a. .. Further, as will be described later, the female screw of the dummy type ejector plate 23 is used as an interlock mechanism for preventing the first ejector rod 4a from being forgotten to be removed from the dummy type ejector plate 23 when the dummy mold 3 is removed. At the bottom of the hole 41, a sensor 39 including a switch pressed by the male screw 40 of the first ejector rod is provided. A hole 38 for inserting the operating rod 22a of the drive means 22 provided in the second base plate 12 is formed on the surface of the first dummy mold 3a in contact with the second base plate 12.

The driving means 22 of the ejector mechanism 20 is not particularly limited, and a known one such as an air cylinder, a hydraulic cylinder, or a screw mechanism using an electric motor can be adopted. Since the injection molding machine is originally intended for molding a composite molded product, the drive means 22 of the ejector mechanism 20 can be provided on the first base plate 11 as needed. When the driving means 22 is provided on the first base plate 11, the first dummy mold 3a is attached to the first base plate 11 and the second dummy mold 3b is attached to the rotating plate 13, and the rotation is also performed. The molding die 2 can be attached to the plate 13 and the molding die 1 can be attached to the second base plate 12.

The dummy type ejector plate 23, the urging means 36, and the sensors 37 and 39 may be provided inside the second dummy type 3b instead of the first dummy type 3a. Further, the configuration in which the dummy type ejector plate 23 and the like are provided is not limited to the configuration in which the dummy mold 3 is divided in the thickness direction, and these configurations are divided into a single dummy as shown in FIG. The case where it is adopted for the mold 3 can also be included in the present invention. A plurality of holes 34 are formed in the single dummy mold 3 in order to select holes 34 at appropriate positions and insert the ejector rod 4. Further, also in the embodiment shown in FIG. 4, as will be described later, the ejector rod 4 can be configured to be detachably attached to the dummy type ejector plate 23.

As shown in FIG. 2, a male screw 40 is formed at the base end of the first ejector rod 4a of the ejector rod 4, and a female screw hole 41 is formed in the dummy type ejector plate 23 (female screw hole 41). Is shown only in the portion where the ejector rod 4 is connected in FIG. 2, but is actually formed at a position corresponding to the hole 31 of the first dummy mold 3a), and the first ejector rod 4a. By screwing the male screw 40 into the female screw hole 41 of the dummy type ejector plate 23, the first ejector rod 4a is detachably attached to the dummy type ejector plate 23. Further, the first ejector rod 4a and the second ejector rod 4b constituting the ejector rod 4 are configured such that the connecting ends thereof are detachable from each other. In the embodiment shown in FIG. 2, a female screw hole 46 is formed at the tip of the first ejector rod 4a, and a male screw is formed at the rear end of the second ejector rod 4b. Further, as will be described later, the bottom of the female screw hole 46 has a second ejector rod 4b as an interlock mechanism for preventing the first ejector rod 4a and the second ejector rod 4b from being forgotten to be removed when the dummy mold 3 is removed. A sensor 46 including a switch pressed by the male screw 45 of the above is provided. The division of the ejector rod 4 in the longitudinal direction is not limited to the present embodiment (two), and may be divided into three or more as needed. Further, the length of the ejector rod 4 when the ejector rods 4a, 4b ... Divided in the length direction are connected is such that the drive means 22 protrudes and operates while being connected to the dummy type ejector plate 23. When not, the ejector pin 21 of the molding die 2 is not projected, and when the driving means 22 projects, the molding die ejector plate 25 is pressed and the molded product P is molded by the ejector pin 21. It is set to a length that allows it to protrude from 2 and be released from the mold. The dummy mold 3 is cheaper than the molding molds 1 and 2 because the cavity, runner, and the like are not provided even if the dummy mold ejector plate 23 and the like are provided.

A dummy mold 3 (first dummy mold 3a and second dummy mold 3b) divided in the thickness direction is attached between the second base plate 12 and the rotating disc 13, and the ejector rod is divided in the length direction. When connecting 4 (the first ejector rod 4a and the second ejector rod 4b), the first dummy mold 3a and the second dummy mold 3b are integrated as shown in FIG. 3A. .. In this state, the first dummy mold 3a and the second dummy mold 3b are carried in between the second base plate 12 and the rotary disc 13, and the first dummy mold 3a and the second dummy mold 3b are attached to the second base plate 12 and the rotary disc 13, respectively. At this time, the first dummy mold 3a and the second dummy mold 3b are integrated by fitting the alignment pin 30 into an alignment hole (not shown). The attachment of the first dummy mold 3a to the second base plate 12 and the attachment of the second dummy mold 3b to the rotating plate 13 are in a state in which the first dummy mold 3a and the second dummy mold 3b are necessarily integrated. The first dummy mold 3a and the second dummy mold 3b may be attached to the second base plate 12 and the rotary plate 13 in an individual state where they do not collide with each other.

After that, as shown in FIG. 3B, the rotating disk 13 is moved so as to be separated from the second base plate 12, and the first dummy mold 3a and the second dummy mold 3b are separated from each other to open the mold. .. At this time, the distance for opening the molds of both the dummy molds 3a and 3b does not need to be longer than the length of the entire ejector rod 4 in which the second ejector rod 4b is connected to the first ejector rod 4a, and the mold is opened to the first dummy mold. The length may be equal to or greater than the length of the first ejector rod 4a protruding from 3a plus the length of the second ejector rod 4b including the male screw 45.

Subsequently, the first ejector rod 4a is inserted into the selected hole 31 of the first dummy mold 3a, and the tip portion of the first ejector rod 4a protruding from the first dummy mold 3a is grasped and rotated about the axis. Thereby, the male screw 40 can be easily screwed and connected to the female screw hole 41 of the dummy type ejector plate 23. The first ejector rod 4a connected to the dummy type ejector plate 23 is set to have a length protruding from the surface abutting with the second dummy type 3b of the first dummy type 3a. The connection of the first ejector rod 4a to the dummy type ejector plate 23 can be detected by the sensor 39.

After that, the second ejector rod 4b is connected to the first ejector rod 4a. This connection is made between the opened first dummy mold 3a and the second dummy mold 3b, and the male screw of the second ejector rod 4b is inserted into the female screw hole 46 at the tip of the first ejector rod 4a protruding from the first dummy mold 3a. This can be easily done by screwing 45. The connection of the second ejector rod 4b to the first ejector rod 4a can be detected by the sensor 44. The ejector rod 4a may be connected to the dummy ejector plate 23 of the first dummy mold 3a and left before the dummy mold 3 is attached between the second base plate 12 and the rotary disc 13. In that case, after the dummy mold 3 is attached between the second base plate 12 and the rotating disc 13, the first dummy mold 3a and the second dummy mold 3b are opened, and the second dummy mold 3a is attached to the tip of the first ejector rod 4a. All you have to do is connect the ejector rod 4b. Further, in this case, if it is desired to change the position of the ejector rod 4, the first ejector rod 4a is once removed from the dummy type ejector plate 23, pulled out from the hole 31 of the first dummy type 3a, and replaced with a hole 31 at another position. It may be reinserted and connected to the dummy type ejector plate 23, and then the ejector rod 4b may be further connected to the first ejector rod 4a.

After opening the first dummy mold 3a and the second dummy mold 3b, the end portion connecting the second ejector rod to the selected hole 32 of the second dummy mold 3b and the first ejector rod 4a is the second end. Insert it so that it slightly protrudes from the dummy mold 3b toward the first dummy mold 3a, and then insert the first ejector rod 4a into the selected hole 31 of the first dummy mold 3a and connect it to the dummy mold ejector plate 23. Then, the first ejector rod 4a and the second ejector rod 4b may be connected. Further, the first ejector rod 4a and the second ejector rod 4b may be connected by a configuration other than the male screw 45 and the female screw hole 46.

After that, as shown in (c) of FIG. 3, when the rotary disk 13 is moved close to the second base plate 12 and the first dummy mold 3a and the second dummy mold 3b are abutted against each other, a predetermined thickness is obtained. An integral dummy mold 3 having the same can be configured. Further, when the first dummy mold 3a and the second dummy mold 3b collide with each other, the tip of the connected ejector rod 4 penetrates the hole 33 of the rotating disk 13, and the molding mold ejector in the molding mold 2 on the opposite side is formed. It becomes possible to touch and press the plate 25.

Next, a method of molding a molded product using the injection molding machine according to the present embodiment will be described.

The method in the present embodiment generally forms a standard molded product P using an injection molding machine capable of molding a so-called composite molded product, and molds the first base plate 11 and the rotary plate 13. Along with attaching the molds 1 and 2, a dummy mold 3 is attached between the turntable 13 and the second base plate 12. The dummy mold 3 is divided into a first dummy mold 3a attached to the second base plate 12 and a second dummy mold 3b attached to the rotary plate 13 in the thickness direction. Further, a dummy type ejector plate 23 is provided inside the first dummy type 3a. Further, the ejector rod 4 is divided into a first ejector rod 4a and a second ejector rod 4b in the length direction so as to be connectable to each other, and can be detachably connected to the dummy type ejector plate 23. It is configured as follows. Then, holes 31, 32, and 33 for inserting the ejector rods 4 are appropriately projected and operated in the first dummy mold 3a, the second dummy mold 3b, and the turntable 13 by appropriately projecting the ejector pins 21 of the molding mold 2. Multiple pieces are formed so that they can be used.

Hereinafter, the molding method according to the embodiment of the present invention will be described in detail. Prior to molding the standard molded product P, as shown in FIG. 3A, the first dummy mold 3a of the integrated dummy mold 3 is attached to the second base plate 12, and the second dummy mold 3 is attached. 3b is attached to the turntable 13.

After that, as shown in FIG. 3B, the rotating disk 13 is moved so as to be separated from the second base plate 12, and the first dummy mold 3a and the second dummy mold 3b are opened. The distance between the first dummy mold 3a and the second dummy mold 3b when the mold is opened is slightly longer than the longer of the first ejector rod 4a and the second ejector rod 4b, whichever is longer. As long as it is sufficient, it is not necessary to open the mold beyond the length of the entire ejector rod 4 to which the second ejector rod 4b is connected to the first ejector rod 4a.

Subsequently, in the present embodiment, the first ejector rod 4a is inserted into the hole 31 at a predetermined position of the first dummy mold 3a, and the first ejector rod 4a is connected to the dummy type ejector plate 23. As for the mounting position of the ejector rod 4, the holes 31 at the positions where the molded products P having different shapes are appropriately projected on the plane orthogonal to the mold opening / closing direction can be selected from the plurality of holes 31, and therefore various. It is possible to correspond to the molding of the molded product P having a shape.

Next, in the present embodiment, the second ejector rod 4b is connected to the first ejector rod 4a. At this time, the first dummy mold 3a and the second dummy mold 3b are opened, and the tip of the first ejector rod 4a protrudes from the first dummy mold 3a, so that the first dummy mold 3a and the second dummy mold 3a and the second dummy mold The second ejector rod 4b can be easily connected to the first ejector rod 4a with and from the 3b. As described above, the first ejector rod 4a may be left in the removed dummy mold 3.

Subsequently, as shown in FIG. 3 (c), when the rotary disk 13 is moved close to the second base plate 12 and the first dummy mold 3a and the second dummy mold 3b are brought into contact with each other, the connected ejectors are connected. The rod 4 is inserted so as to penetrate the hole 33 of the turntable 13, and a single dummy mold 3 is formed.

After the injection molding machine is configured in advance in this way, the first base plate 11 is moved closer to the second base plate 12 and the rotary plate 13 to close the molding molds 1 and 2, and the first base plate 11 is moved to the first base. The two pedestals 12 are molded with a predetermined pressure, and the molding mold 1 attached to the first pedestal 11 is touched with the nozzle of the injection device 14, and melt plasticized at a predetermined pressure, injection speed, or the like. A predetermined amount of the single molding material is injected into the cavity and solidified. Perform molding. The molding die 2 is attached to one of the mounting surfaces 13a and 13b of the turntable 13, while the second dummy die 3b is attached to the other, which is used when molding a standard molded product. The turntable 13 is not rotated.

When the molding material is solidified, as shown in FIG. 1 (b), the mold clamping between the first base plate 11 and the second base plate 12 is released, and the first base plate 11 is replaced with the second base plate 12 Molds 1 and 2 are opened by moving them away from the mold. At that time, the molded product is released from the molding mold 1 and held in the molding mold 2. However, the first dummy mold 3a and the second dummy mold 3b are not opened. Next, a projecting operation is performed in which the operating rod 22a of the driving means 22 of the ejector mechanism 20 provided on the second base 12 is extended and driven. Then, the dummy type ejector plate 23 advances against the urging by the urging means 36, and the ejector rod 4 presses the molding type ejector plate 25 accordingly to push the ejector pin 21 from the cavity surface of the molding type 2. Stick out. As a result, the molded product P is released from the molding mold 2 and projected, and is taken out by a take-out robot (not shown).

After the molded product P is taken out, the operating rod 22a of the driving means 22 is retracted to release the projecting operation of the ejector mechanism 20 by the driving means 22. At this time, it is detected by the sensor 37 shown in FIG. 4 that the dummy type ejector plate 23 is surely retracted by the urging means 36. The signal of the sensor 37 is transmitted to the control means (not shown) of the injection molding machine, and the dummy type ejector plate 23 is the urging means 36 even though the projecting operation by the drive means 22 of the ejector mechanism 20 is released. If it is not possible to detect that the vehicle has retreated, it can be configured to determine that an abnormality has occurred and issue a warning.

When the molding of the standard molded product is completed, the first dummy mold 3a and the second dummy mold 3b are opened by separating the rotary plate 13 from the second base plate 12 after the molding is completed. 2 Remove the ejector rod 4b from the first ejector rod 4a. At this time, since the connecting portion between the first ejector rod 4a and the second ejector rod 4b is located between the first dummy mold 3a and the second dummy mold 3b, the second ejector rod 4b is used as the first ejector rod 4a. Can be easily removed from. The removal of the second ejector rod 4b from the first ejector rod 4a is detected by the sensor 44, and the signal is output to the control means. After that, the first ejector rod 4a is removed from the dummy type ejector plate 23 of the first dummy type 3a. Also at this time, since the tip of the first ejector rod 4a is located between the first dummy mold 3a and the second dummy mold 3b, the first ejector rod 4a can be easily removed from the dummy mold ejector plate 23. can. Then, the removal of the first ejector rod 4a from the dummy type ejector plate 23 is detected by the sensor 39, and the signal is output to the control means. The control means is a signal indicating that the second ejector rod 4b by the sensor 44 has been removed from the first ejector rod 4a (when the first ejector rod 4a is left in the first dummy mold 3a), or a second by the sensor 39. 1 Upon receiving a signal indicating that the ejector rod 4a has been removed from the dummy ejector plate 23 (when the first ejector rod 4a is not left in the first dummy mold 3a), the first dummy mold 3a and the second dummy mold 3b are moved. Allows transition to remove mode. However, it is not necessary to remove the first ejector rod 4a when molding is planned with the same molding molds 1 and 2 at the time of molding the next standard molded product.

After that, the rotating disc 13 is brought close to the second base plate 12 again, the first dummy mold 3a and the second dummy mold 3b are closed, and the second base plate 12 and the rotating disc 13 to the first dummy mold are closed. The 3a and the second dummy mold 3b are removed and carried out from between the second base plate 12 and the rotating plate 13. At this time, in a state where the ejector rod 4 is forgotten to be removed (that is, a state where the second ejector rod 4b is forgotten to be removed from the first ejector rod 4a, or a state where the first ejector rod 4a is forgotten to be removed from the dummy type ejector plate 23). When the first dummy mold 3a and the second dummy mold 3b are to be removed from the second base plate 12 and the rotating disc 13, the ejector rod 4 receives a signal output from the sensor 44 or 39 constituting the interlock mechanism. When the forgotten removal is detected, the control means switches the injection molding machine to the mode for removing the first dummy mold 3a and the second dummy mold 3b, or issues a warning.

Next, another embodiment will be described with reference to FIG. In the present embodiment, the same or equivalent configurations as those in the above-described embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different configurations will be described.

In the above-described embodiment, the ejector rod 4 is configured to directly press the back surface of the molded ejector plate 25, whereas in the present embodiment, the intermediate rod 50 is roughly provided on the turntable 13. , The ejector rod 4 is configured to directly press the molded ejector plate 25 via the intermediate rod 50.

In the present embodiment, a plurality of through holes 51 are formed at positions corresponding to the holes 31 and 32 formed in the first dummy mold 3a and the second dummy mold 3b of the turntable 13, and each through hole 51 is formed. An intermediate rod 50 having a head 50a is housed in the molding molds 1 and 2 so as to be movable in the opening / closing direction. A retainer 52 for pressing the head 50a of the intermediate rod 50 is provided in the opening on the side of each through hole 51 of the turntable 13 on the side where the second dummy mold 3b is in contact, and each through hole of the turntable 13 is provided. A guide 53 through which the tip end portion of the intermediate rod 50 is slidably inserted is provided in the opening on the side where the molding die 2 of 51 is in contact. Between the head 50a of the intermediate rod 50 and the guide 53, an urging means 54 including, for example, a coil spring is provided in order to urge the intermediate rod 50 to retract. At the tip of the intermediate rod 50, a female screw hole 57 is formed in which the male screw portion 56 of the rod 55 that presses the molded ejector plate 25 is screwed and connected. The stroke of the rod 55 or the like connected to the intermediate rod 50 does not cause the ejector pin 21 of the mold 2 to protrude when the drive means 22 (see FIG. 1) is not protruding, and the drive means When the 22 is projected, the mold ejector plate 25 is pressed and the ejector pin 21 is set to a stroke that allows the molded product P to be projected from the mold 2 and released from the mold 2. Further, the ejector rod 4 in this embodiment does not press the head 50a of the intermediate rod 50 when the driving means 22 (see FIG. 1) is not protruding, and the driving means 22 protrudes. When performing the operation, the head 50a of the intermediate rod 50 is pressed, and the length is set so that the molded product P can be projected from the molding mold 2 and released from the molding mold 2 by the ejector pin 21 via the molding mold ejector plate 25. ..

In another embodiment of FIG. 5, similarly to the embodiment shown in FIG. 1 or 3, the dummy mold 3 is divided into a first dummy mold 3a and a second dummy mold 3b in the thickness direction thereof. Alternatively, it may be composed of a single dummy mold 3 as in the embodiment shown in FIG.

Therefore, in another embodiment of FIG. 5, it is not necessary to insert the ejector rod 4 so as to penetrate the hole 33 of the rotary disk 13 as in the above-described embodiment, and the dummy mold 3 is shown in FIGS. 1 and 3. When it is divided into the first dummy mold 3a and the second dummy mold 3b as shown, when it is configured by these holes 31 and 32, and when it is configured by a single dummy mold 3 as shown in FIG. All that is required is to insert the ejector rod 4 into the hole 34. Further, in some cases, the dummy mold 3 may be configured to include the urging means 36 for urging the ejector plate 23 rearward, without further providing not only the urging means 36 but also the ejector plate 23 itself. can.

Also in another embodiment shown in FIG. 5, a molded product can be molded by the method described above.

1, 2: Molding mold, 3: Dummy mold, 3a: 1st dummy mold, 3b: 2nd dummy mold, 4: Ejector rod, 4a: 1st ejector rod, 4b: 2nd ejector rod, 20: Ejector mechanism, 21: Ejector pin, 22: Drive means, 23: Dummy type ejector plate, 31: First dummy type hole, 32: Second dummy type hole, 33: Rotating disk hole

Claims (4)

The first and second pedestals arranged facing each other,
A rotating disk disposed between the first base plate and the second base plate and rotatably supported,
Equipped with an ejector mechanism that projects the molded product
The first base plate, the second base plate, and the rotary base are injection molding machines to which a molding mold or a dummy mold can be attached, respectively.
Molds are attached to either one of the first base plate and the second base plate, and one surface of the rotating disc.
A dummy mold is arranged between any one of the first base plate and the second base plate and the other surface of the rotating disc.
The ejector mechanism includes an ejector pin for projecting a molded product from a molding die attached to one surface of the rotating disk, and at least one of the first base plate and the second base plate to which the dummy mold is attached. It is provided with a drive means provided on the other side and an ejector rod for transmitting the projecting motion of the drive means to the ejector pin.
The dummy mold is divided into a first dummy mold and a second dummy mold in the thickness direction, and any one of the first base plate and the second base plate is the first dummy mold. Is attached, and the second dummy mold is attached to the other surface of the turntable so that the first dummy mold and the second dummy mold can be opened and closed. The injection molding machine according to claim 1 , wherein the ejector rod is divided into a plurality of parts in the longitudinal direction thereof. Injection molding machine,
The first and second pedestals arranged facing each other,
A rotating disk disposed between the first base plate and the second base plate and rotatably supported,
Equipped with an ejector mechanism that projects the molded product
Molds are attached to one of the first pedestal and the second pedestal and one surface of the rotating pedestal, and the first pedestal and the second pedestal are attached to each other. A dummy mold is attached between the turntable and the other surface.
It is a molding method of a molded product in which a molding material is injection-filled into a cavity formed by the molding mold to mold the molded product.
The dummy mold is attached to the first dummy mold attached to either the first base plate or the second base plate, and the other surface of the rotating disc, and is relative to the first dummy mold. It is composed of a second dummy type that can be opened and closed.
The ejector mechanism is attached to an ejector pin for projecting a molded product from a molding die attached to one surface of the rotating disk, and the first and second pedestals to which at least the first dummy die is attached. The drive means provided on either one, the ejector plate provided inside the dummy mold and pressed by the drive means to move in parallel with the opening / closing direction of the molding mold, and the ejector plate. The structure includes an ejector rod that transmits the projecting operation by the driving means to the ejector pin, and a hole through which the ejector rod is inserted is formed in the dummy mold.
The ejector rod is divided into a plurality of pieces in the longitudinal direction and connected to the ejector plate in a detachable manner, and is detachably connected to the ejector plate.
In a state where the first dummy mold and the second dummy mold are opened with the first base plate, any other of the second base discs, and the rotating disc relatively separated from each other, at least of the ejector rod. There is no ejector rod that can transmit the projecting motion by the driving means to the ejector pin by connecting one that is divided in the length direction.
The first dummy mold and the second dummy mold are made to collide with each other of the first base plate and the second base plate with the rotating disc relatively close to each other.
One of the first base plate and the second base plate and the rotating disc are relatively close to each other, and the molding molds are brought into contact with each other and molded to form a molded product, and the molding mold is formed. A method for molding a molded product, in which the mold is opened and the molded product is projected from the molding mold by the ejector mechanism. The first and second pedestals arranged facing each other,
A rotating disk disposed between the first base plate and the second base plate and rotatably supported,
Equipped with an ejector mechanism that projects the molded product
A molding die or a dummy die can be attached to the first base plate, the second base plate, and the rotary base, respectively.
Molds are attached to either one of the first base plate and the second base plate, and one surface of the rotating disc.
The ejector mechanism includes an ejector pin for projecting a molded product from a molding die attached to one surface of the rotating disk, and at least one of the first base plate and the second base plate to which the dummy mold is attached. In an injection molding machine provided with a drive means provided on the other side and an ejector rod for transmitting a projecting operation by the drive means to the ejector pin.
A dummy mold of an injection molding machine mounted between either one of the first base plate and the second base plate and the other surface of the turntable.
The dummy mold is divided in the thickness direction into a first dummy mold attached to either one of the first base plate and the second base plate and a second dummy mold attached to the other surface of the rotating disc. A dummy mold of an injection molding machine that can be opened and closed.

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