JP2019111670A - Injection blow molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection blow molding machine in which maintenance of an injection device is easy. SOLUTION: A mold plate device (2) is opened and closed by a fixing plate (5) provided with an injection molding mold (21) and a mold clamping mechanism (13), and a blow molding mold (23). The injection blow molding machine (1) including the movable platen (6) provided with the above and the intermediate plate (8) provided between them is targeted. When the mold device (2) is closed and the resin is injected, the parison (40) is molded in the injection molding die (21), and when the mold is opened, the parison (40) remains in the intermediate plate (8). When the intermediate plate (8) is inverted, the mold plate device (2) is closed again, and air is blown into the parison (40) by the blow molding mold (23), the hollow molded product (41) is formed. It has become like. In the present invention, in such an injection injection molding machine (1), an intermediate plate opening / closing mechanism (14) for opening / closing the intermediate plate (8) is provided on the movable platen (6). [Selection diagram] Fig. 1

Description

  The present invention relates to an injection blow molding machine in which an injection molding machine for molding a parison by injection molding and a blow molding machine for molding a hollow molded product from the parison by blow molding are integrated.

  Most of the hollow containers made of resin are formed by blow molding. In the blow molding method, for example, a half mold is used, and the mold is provided with a cavity for forming the outside of a molded article. Such a two-piece mold sandwiches a heated hollow resin, or parison, and blows air to the inside of the parison. The parison is then expanded and forced into the cavity. That is, a hollow molded article is obtained. After the resin has cooled and solidified, the mold is opened and the hollow molded article is taken out. By the way, parisons include pipe-like parisons that are extruded and come out in a so-called direct blow molding method, but also parisons with bottoms. The bottomed parison can be molded by injection molding. A method of forming a parison by injection molding and blow molding the parison is called injection blow molding. Furthermore, when blow molding an injection molded parison immediately without cooling, it may be referred to as hot parison injection blow molding.

  Since the hot parison injection blow molding method uses the parison without cooling, in other words, since the parison is used without reheating, the waste of energy is small and excellent. An injection blow molding machine is known as an apparatus capable of efficiently performing the hot parison injection blow molding method. The injection blow molding machine has a structure in which an injection molding machine and a blow molding machine are integrated, and a typical structure is described, for example, in Patent Document 1.

Unexamined-Japanese-Patent No. 2006-35667

  A typical injection blow molding machine as described in Patent Document 1 includes a fixed platen, a movable platen, and an intermediate platen provided therebetween. The movable platen is driven by the mold opening and closing mechanism, and the intermediate platen is driven by a predetermined intermediate platen opening and closing mechanism provided on the fixed platen side. The fixed platen is provided with an injection molding die, and the nozzle of the injection device provided on the back surface of the fixed platen touches the sprue of the injection molding die. When the fixed platen and the intermediate platen are closed, a cavity for molding a parison is formed by the injection mold and a predetermined portion of the intermediate platen. On the other hand, the movable platen is provided with a two-piece blow molding die that slides on the movable platen. The intermediate plate and the movable plate are closed, and when the two halves of the blow molding die slide and integrate, a blow molding cavity is formed. In the injection blow molding machine described in Patent Document 1, the intermediate board is provided with a rotary frame rotating with respect to the intermediate board and a molded article gripping device moved by the rotary frame. A parison injection molded between the injection mold and the intermediate plate is held by the molded article holding device, rotated by the rotary frame, and moved to the opposite surface of the intermediate plate, that is, the movable plate side. It has become. In the injection blow molding machine described in Patent Document 1, a hollow molded article is molded as follows. First, the intermediate plate and the fixed plate are closed by the intermediate plate opening / closing mechanism, and the movable plate is driven by the mold opening / closing mechanism to close the movable plate and the intermediate plate. When resin is injected from the injection device, a parison is formed in a cavity in an injection mold, which is closed between a fixed plate and an intermediate plate. The mold opening and closing mechanism is driven to open the movable disc, and the intermediate disc opening and closing mechanism is driven to open the intermediate disc relative to the fixed disc. Then the parison remains on the middle board. As the rotating frame is rotated, the parison is moved to the opposite surface of the intermediate plate by the molded article gripping device. Again, the intermediate plate and the fixed plate are closed as described above, and the movable plate and the intermediate plate are closed. When the two blow molding molds provided on the movable plate are slid and integrated, the parison moved by the molded article gripping device is sandwiched between the blow molding molds. Blow molding is performed to form a hollow molded article. At this time, resin is injected from the injection device, and the next parison is molded in an injection mold. Open the movable plate and open the intermediate plate to the fixed plate to obtain a hollow molded article. The rotating frame is rotated to move the injection molded parison to the opposite surface of the intermediate plate. Hereinafter, it shape | molds similarly.

  Incidentally, depending on the injection blow molding machine, the intermediate plate may be reversely rotated. In such an injection blow molding machine, the intermediate disc and the fixed disc are closed, and the movable disc is driven by the mold opening / closing mechanism to mold-close the movable disc and the intermediate disc for injection molding. When the movable plate is opened and the intermediate plate is opened from the fixed plate, the parison remains on the intermediate plate. Then, when the intermediate plate is reversed, the parison moves to the movable plate side. In other words, it faces the movable plate. In this state, the intermediate disc and the fixed disc are closed, and the movable disc is driven by the mold opening / closing mechanism to close the movable disc and the intermediate disc, thereby unifying the two halves of the blow molding die And, the parison will be sandwiched by the blow molding die. Blow molding can be performed by this.

  Use of the parison formed by injection molding for blow molding promptly by the injection blow molding machine described in Patent Document 1 or by the injection blow molding machine in which the intermediate plate is reversely rotated. And the entire device is compact and excellent. However, there are also problems to be solved. Specifically, there is a problem that maintenance of the injection device is difficult. In the injection blow molding machine having an intermediate plate between the fixed plate and the movable plate, the movable plate is a clamping mechanism used in the injection molding machine, such as a toggle clamping mechanism or a hydraulic clamping mechanism. Although it can be driven, the intermediate disc needs to be driven by another mechanism. It is technically natural that the opening and closing of the intermediate board is driven on the basis of the fixed position, and the intermediate board opening and closing mechanism is provided on the fixed board which is fixed and the position does not change. I have to. Therefore, the intermediate plate can be opened and closed with respect to the fixed plate accurately and safely. Also in terms of mold protection, the meaning of providing an intermediate disc opening and closing mechanism on the fixed disc is significant. When closing the mold from the mold open state, first, the middle board is closed to the fixed board by the intermediate board opening / closing mechanism and the intermediate board is kept stationary, and in this state, the mold clamping mechanism is driven to move the movable board If the mold closing order for mold closing with respect to the disc is observed, and if the mold is opened from the mold closed state, the mold clamping mechanism is driven to open the movable disc and then the intermediate disc opening / closing mechanism is driven to open the intermediate disc This is because the injection mold and the blow mold can be protected if the opening order is followed. However, since the injection device is provided on the back surface of the fixed plate, and the middle plate opening / closing mechanism is disposed in the vicinity of the injection device, there is a problem that the maintenance of the injection device is hindered. The injection device requires periodic maintenance such as purge, but it is difficult to perform maintenance because there is an intermediate plate opening / closing mechanism in the vicinity.

  An object of the present invention is to provide an injection blow molding machine which solves the problems as described above, and more specifically, to provide an injection blow molding machine which facilitates maintenance of an injection device. .

  According to the present invention, in order to achieve the above-mentioned object, a platen device comprises a stationary platen, a movable platen which is opened and closed by a clamping mechanism, and an intermediate platen provided between the stationary platen and the movable platen. The present invention is directed to an injection blow molding machine in which an injection molding die is provided on a fixed platen and a blow molding die is provided on a movable platen. In such an injection blow molding machine, when the mold device is closed and resin is injected from the injection device, a parison is formed in the injection mold, and when the mold is opened, the parison is left on the intermediate plate . The parison of the intermediate disc faces the movable disc by inverting the intermediate disc or by a predetermined means. When the mold apparatus is closed again and blow molding is performed using a blow molding die, a hollow molded article is formed from the parison. According to the present invention, in such an injection blow molding machine, the movable disc is provided with an intermediate disc opening / closing mechanism. When the intermediate board opening and closing mechanism is driven, the intermediate board is configured to be opened and closed with respect to the movable board.

Thus, in order to achieve the above object, according to the first aspect of the present invention, in order to achieve the above object, a die apparatus is provided between a fixed board, a movable board which is opened and closed by a mold clamping mechanism, and the fixed board and the movable board. The fixed platen is provided with an injection molding die and the movable platen is provided with a blow molding die, the mold assembly is closed, and the resin is injected from the injection device. Then, a parison is molded in the injection mold, the parison is left on the intermediate disc when the mold is opened, and the parison of the intermediate disc is opposed to the movable disc by inverting the intermediate disc or by a predetermined means. An injection blow molding machine configured to form a hollow molded article from a parison when the mold apparatus is closed and the blow molding is performed using the blow molding die, and the movable board is opened and closed with the intermediate board. Machine It is provided, constructed as an injection blow molding machine in which the intermediate plate by the intermediate panel switch mechanism is characterized in that is adapted to be die opening and closing with respect to the movable plate.
The invention described in claim 2 is the injection blow molding machine according to claim 1, wherein the intermediate disc opening and closing mechanism is constituted by a ball screw mechanism.

  As described above, according to the present invention, the mold apparatus comprises the fixed board, the movable board which is opened and closed by the mold clamping mechanism, and the intermediate board provided between the fixed board and the movable board. The present invention is directed to an injection blow molding machine in which an injection molding die is provided on a movable plate with a blow molding die. According to the present invention, the movable disc is provided with an intermediate disc opening / closing mechanism, and the intermediate disc is opened / closed relative to the movable disc by the intermediate disc opening / closing mechanism. That is, the intermediate board opening / closing mechanism is not provided on the fixed board provided with the injection device. In this case, maintenance such as purge regularly performed in the injection device is not hindered. By the way, a mold opening and closing mechanism is provided on the movable platen provided with the intermediate board opening and closing mechanism. Although it is also necessary to maintain the mold opening and closing mechanism, generally the frequency of maintenance of the mold opening and closing mechanism is much smaller than the frequency of maintenance of the injection device. Therefore, there is substantially no disadvantage due to the fact that the intermediate board opening and closing mechanism is provided on the movable board. Since the intermediate disc opening / closing mechanism is provided on the movable disc, when closing the mold apparatus, after the intermediate disc is closed against the movable disc by the intermediate disc opening / closing mechanism, the movable disc and the intermediate disc It is necessary to close the mold against the fixed plate. When the mold is opened, it is first necessary to open the movable disc and the intermediate disc relative to the fixed disc by the mold opening and closing mechanism, and then to open the intermediate disc relative to the movable disc by the intermediate disc opening and closing mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the injection blow molding machine which concerns on embodiment of this invention, The (A) is the injection blow molding in the state which the (A) closed in the state where the mold apparatus was opened. It is a front view of a machine. FIG. 7 schematically illustrates a method of molding a hollow molded article in the injection blow molding machine according to the embodiment of the present invention, wherein (a) to (d) are parts of the injection blow molding machine in respective steps It is a front view showing. FIG. 7 schematically illustrates a method of molding a hollow molded article in the injection blow molding machine according to the embodiment of the present invention, wherein (a) to (d) are parts of the injection blow molding machine in respective steps It is a front view showing. FIG. 7 schematically illustrates a method of molding a hollow molded article in the injection blow molding machine according to the embodiment of the present invention, wherein (a) to (d) are parts of the injection blow molding machine in respective steps It is a front view showing.

  Hereinafter, the present embodiment will be described. The injection blow molding machine 1 according to the present embodiment is, as shown in (A) and (A) of FIG. 1, high-pressure air not shown in the figure, the template apparatus 2, the injection apparatus 3. It roughly comprises a supply device. The platen device 2 is provided between the fixed platen 5 fixed to the bed, the movable platen 6 that slides with respect to the bed to be opened and closed by the mold, and the fixed platen 5 and the movable platen 6 An intermediate plate 8 sliding with respect to the bed, a mold clamping housing 10, four tie bars 11, 11, ..., a mold clamping mechanism 13, and an intermediate according to the present embodiment described later It comprises a panel opening and closing mechanism 14. The tie bars 11, 11,... Connect the fixed platen 5 and the clamping housing 10, and the movable platen 6 and the intermediate platen 8 are inserted into the tie bars 11, 11,. The mold clamping mechanism 13 is provided between the mold clamping housing 10 and the movable platen 6 and, in the present embodiment, comprises a toggle mechanism 16 provided with a crosshead 15. The cross head 15 is driven by the mold opening / closing motor 18 and the ball screw mechanism 19, and when the cross head 15 is driven, the toggle mechanism 16 is extended and the movable platen 6 is slid back and forth. That is, the mold is opened and closed.

  The fixed platen 5 is provided with an injection molding die 21. The injection molding die 21 has a plurality of recesses 21a, 21b,... Formed in the parting line. These are bottomed hollow bodies of a resin used for blow molding, that is, recesses 21a, 21b,... For forming a parison by injection molding. Although only three concave portions 21a, 21b,... Are shown in FIG. 1, a large number of concave portions are actually provided. For example, a total of 64 recesses are formed, eight in the longitudinal direction and eight in the lateral direction. In this case, 64 parisons will be formed at the same time. An injection device 3 is provided on the back of the fixed platen 5, and an injection nozzle 3 a of the injection device 3 is in contact with a not-shown sprue of the injection molding die 21.

  The movable platen 6 is provided with a plurality of pairs of blow molding dies 23A, 23a, 23B, 23b,. The pair of blow molding molds 23A, 23a is composed of two split molds 23A, 23a, and slides on the movable plate 6 so as to be separated from or integrated with each other. A recess is formed in the pair of molds 23A and 23a, and when the pair of molds 23A and 23a are slid and integrated, an outer peripheral surface of the hollow molded article is formed from these recesses. A cavity is to be configured. The number of pairs of blow molding dies 23A, 23a, 23B, 23b,... Is equal to the number of recesses 21a, 21b,. Therefore, it is possible to blow-mold hollow molded articles as many as the number of parisons injection-molded at one time in the injection mold 21 at one time.

  In the present embodiment, the intermediate board 8 rotates in reverse. Specifically, the intermediate plate 8 is provided on the outer side of the frame portion 25 sliding along the tie bars 11, 11, ..., and the frame portion 25 and supported rotatably relative to the frame portion 25. And the main body 26. The main body portion 26 is reversely rotated as shown by the arrow 28 in FIG. Cores 30, 30,... Are provided on both sides of the body portion 26 of such an intermediate board 8. As shown in FIG. These cores 30, 30,... Are the cores 30, 30,... Of the surface facing the fixed platen 5 when the mold apparatus 2 is closed, and the concaves 21a, 21b,. And a cavity for parison molding is configured. Further, the cores 30, 30, ... of the surface facing the movable plate 6 are inserted between the respective sets of blow molding dies 23A, 23a, 23B, 23b, ... in a state where the parison is provided. It has become so. The cores 30, 30,... Are provided with jets of air at their tips, so that high pressure air from the high pressure air supply device is jetted from the tips.

  The injection blow molding machine 1 according to the present embodiment is characterized in the mounting place of the intermediate board opening and closing mechanism 14 for opening and closing the intermediate board 8. Specifically, the intermediate board opening and closing mechanism 14 is provided on the movable board 6. The intermediate disc opening and closing mechanism 14 is composed of a ball screw mechanism 32 and a servomotor 33 for rotating the same. Specifically, the ball nut 35 of the ball screw mechanism 32 is fixed to the frame 25 of the intermediate disc 8 and is screwed to the ball screw 36. The servomotor 33 is provided on the movable plate 6 so as to rotate the ball screw 36. Therefore, when the servomotor 33 is driven to rotate the ball screw 36, the intermediate board 8 opens and closes with respect to the movable board 6.

  The injection blow molding machine 1 according to the present embodiment is also characterized in the order of mold opening and closing by the mold apparatus 2. While describing this feature, a method of molding a hollow molded article by the injection blow molding machine 1 will be described. As shown in (A) of FIG. 2, the description will be given from the state where the mold apparatus 2 is opened. The mold assembly 2 is closed. First, the intermediate board opening / closing mechanism 14 is driven to close the intermediate board 8 with respect to the movable board 6. Then, the intermediate board 8 slides to the left as shown in FIG. When the intermediate plate 8 and the blow molding dies 23A and 23a on the movable plate 6 are closed, the mold clamping mechanism 13 is driven to close the mold. Then, as shown in FIG. 2C, the movable plate 6 and the intermediate plate 8 integrally slide rightward, and the intermediate plate 8 and the injection molding die 21 on the fixed plate 5 It is closed. The mold closing of the template device 2 is completed. As will be understood from this description, when the mold apparatus 2 is closed, the intermediate board 8 slides once to the left and then slides to the right. The movement looks seemingly useless as the sliding direction of the intermediate plate 8 changes, but by closing the mold in this way, without damaging the mold device 2, the molds 21, 23A, 23a and the intermediate plate opening / closing mechanism 14 You can safely close the mold.

  In the mold closed state, a cavity is formed by the recess 21 a of the injection mold 21 and the core 30 of the intermediate plate 8. When resin is injected from the injection device 3, a parison 40 is formed as shown in FIG.

  The mold plate device 2 is opened. First, the mold clamping mechanism 13 is driven to open the movable platen 6 and the intermediate platen 8 with respect to the fixed platen 5. Then, as shown in FIG. 3A, the injection-molded parison 40 is opened while remaining on the core 30 of the intermediate plate 8. Then, the intermediate board opening / closing mechanism 14 is driven to open the intermediate board 8 with respect to the movable board 6 as shown in FIG. Complete the mold opening. As can be understood from this, also when the mold plate device 2 is opened, the intermediate plate 8 slides once to the left and then slides to the right. That is, as in the case of mold closing, the sliding direction of the intermediate plate 8 changes. At first glance, the operation looks useless, but by opening the mold like this, it is possible to open the mold safely without hurting the intermediate disc opening / closing mechanism 14 and the like.

  Invert the intermediate plate 8 in the mold open state. That is, the main body 26 is rotated by 180 ° with respect to the frame 25. Then, as shown in FIG. 3C, the parison 40 faces the blow molding dies 23A and 23a. The mold assembly 2 is closed in the order described above. Then, the parison 40 is disposed between the pair of blow molding dies 23A and 23a, as shown in FIG. As shown in FIG. 4A, the pair of blow molding dies 23A and 23a are slid and integrated. When the high pressure air supply device is driven to blow high pressure air from the core 30, as shown in FIG. 4A, the hollow molded article 41 is formed. At this time, resin is simultaneously injected into the injection mold 21 to mold the parison 40. The template device 2 is opened in the order described above. As a result, as shown in FIG. 4D, a hollow molded article 41 is obtained, and the mold is opened with the parison 40 left on the intermediate plate 8. The same procedure is followed.

  The injection blow molding machine 1 according to the present embodiment can be variously modified. For example, the reverse direction of the intermediate plate 8 can be deformed. In the present embodiment, the intermediate board 8 is adapted to be flipped around a vertical axis as shown in FIG. However, it may be reversed around a horizontal rotation axis.

DESCRIPTION OF SYMBOLS 1 injection blow molding machine 2 mold machine apparatus 3 injection apparatus 5 fixed board 6 movable board 8 middle board 10 mold clamping housing 11 tie bar 13 mold clamping mechanism 14 middle board opening and closing mechanism 21 injection molding mold 21a recessed part 23A, 23a for blow molding Mold 25 Frame part 26 Body part 30 Core 32 Ball screw mechanism 33 Servo motor 35 Ball nut 36 Ball screw 40 Parison 41 Hollow molded article

Claims (2)

The mold apparatus comprises a fixed board, a movable board which is opened and closed by a mold clamping mechanism, and an intermediate board provided between the fixed board and the movable board, and the fixed board is provided with a mold for injection molding. A blow molding die is provided on the movable plate, and the mold unit is closed, and when a resin is injected from the injection device, a parison is formed in the injection molding die, and when the mold is opened, the parison is The parison of the intermediate plate is made to face the movable plate by inverting the intermediate plate or by a predetermined means, the mold unit is closed, and the blow molding die blows. An injection blow molding machine adapted to form a hollow molded article from a parison upon molding,
An injection blow molding machine characterized in that the movable disc is provided with an intermediate disc opening and closing mechanism, and the intermediate disc is opened and closed with respect to the movable disc by the intermediate disc opening and closing mechanism.   The injection blow molding machine according to claim 1, wherein the opening and closing mechanism for the intermediate disc comprises a ball screw mechanism.

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