JPS60149430A - Method and mold device for blow molding - Google Patents

Abstract

PURPOSE:To make the fitting space of a cylinder smaller by providing a cylinder for driving a striking pin and a cylinder for driving a post striking core under a specific condition. CONSTITUTION:Pressure oil is sent out from the oil supply and discharge port 19 of a cylinder 15 for driving a striking pin, and a piston is pressed therebi to drive the striking pin 17 into the cavity 11. Pressure oil is then sent out from the oil supply and discharge port 21 of a cylinder 16 for driving a post striking core to drive the post striking core 18 toward the cavity 11. The end of the parison 24 is pushed into the nozzle molding portion 12a to form a nozzle. Under the condition, air is blown into the parison.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a blow molding method and a mold apparatus used for manufacturing a blow molded product having a nozzle.

[Background technology]

The inventors have developed a blow molding mold device as shown in FIG. In the figure, 1 is a blow molding mold body, in which a nozzle molding space 3 following a cavity 2 is formed. 4 is a cavity 2 and a nozzle molding space 3
This is the parison placed in the . 5 is a driving pin,
It is provided so as to be movable back and forth with its own central axis aligned with the central axis of the nozzle forming space 3. Reference numeral 6 denotes a post-beating core fitted around the outer periphery. The inner circumferential surface of the tip of the post-driving core 6 is cut to form a large diameter portion, and the space between this large diameter portion and the outer circumferential surface of the driving pin 5 is a nozzle forming portion 3a. In this apparatus, blow molding is performed as follows. That is, after putting the parison 4 into the mold body 1 and closing the mold body 1 as shown in FIG. 1, the driving pin 5 is advanced as shown in FIG.
Break the parison 4 and let it reach inside the cavity 2. Next, as shown in FIG. 3, the post-strike core 6 is advanced, and its nozzle forming portion 3a presses the broken end of the parison 4 into the forming portion 3a, thereby forming a nozzle. After blowing is completed, drive pin 5. This is done by retreating the post-strike core 6 in that order, opening the mold body 1, and taking out the molded product. In this case, as a support drive mechanism for the driving pin 5 and the post-driving core 6, a mechanism as shown in FIG. 4 can be considered. That is, a support frame 7 is attached to the blow molding mold body l, a driving pin driving cylinder 8 is attached to the supporting frame 7, and a post-driving core driving cylinder 9 is also attached, and the driving pin driving cylinder is attached to the supporting frame 7. A mechanism is conceivable in which the driving pin 5 is moved forward and backward by hydraulic pressure 8, and the drive rod 9a of the cylinder 9 for driving the post-stroke core is moved forward and backward by the hydraulic pressure to move the post-striking core 6 forward and backward. However, in such a mechanism, it is necessary to install two cylinders, the driving pin driving cylinder 8 and the punching core driving cylinder 9, one above the other, and the installation requires a large space. As a result, problems have arisen in terms of equipment, such as an increase in the number of protruding parts that obstruct molding operations, complicated hydraulic piping, and complicated mounting and fixing of the cylinder.

[Purpose of the invention]

The purpose of this invention is to reduce the space required for cylinder mounting.

[Disclosure of the invention]

In blow molding a molded product having a nozzle, this invention involves inserting a driving pin into the nozzle molding part so as to break through the parison in the nozzle molding part of the mold, and
A blow molding method in which a core fitted onto the driving pin is inserted into a nozzle molding part along the driving pin, and the driving pin is driven by a cylinder whose rear part is a piston rod. In addition, the first gist of the blow molding method is that the after-shot core is driven by a drive means that acts directly on it, and a cylindrical nozzle for molding is installed in the blow molding mold body. A space is formed, and a driving pin having a diameter smaller than the diameter of the nozzle forming space is provided so as to be movable back and forth with its own center axis aligned with the center axis of the nozzle forming space. A cylindrical post-stroke core whose outer diameter is set to be less than or equal to the diameter of the nozzle forming space is fitted around the driving pin so that it can move back and forth, and the rear part of the post-stroke core is coaxial with the driving pin. The rear end of the driving pin is provided coaxially with the driving pin.
The second gist of the blow molding mold device is a blow molding mold device characterized in that the piston rod of a driving pin driving cylinder is formed in the blow molding mold body, and a cylindrical nozzle molding space is formed in the blow molding mold body. A driving pin, whose diameter is smaller than that of the nozzle forming space, is provided so as to be movable back and forth with its own center axis aligned with the center axis of the nozzle forming space. A cylindrical post-driving core whose dimensions are set to be smaller than the diameter of the nozzle forming space is fitted onto the driving pin so as to be movable back and forth, and the post-driving core is provided coaxially with the driving pin. A piston rod of a driving pin driving cylinder that is configured to be screwed into a post-driving core support shaft and screwed back and forth, and the rear part of the driving pin is provided coaxially with the driving pin. The third aspect of the present invention is a blow molding mold device characterized in that it is formed as follows.

Next, the present invention will be explained in detail based on examples.

FIG. 5 is a sectional view showing the structure of an embodiment of the blow molding mold apparatus according to the present invention. In the figure, 10 is a blow molding mold body, and this blow molding mold body 1
A nozzle molding space 12 following the cavity 11 is provided in the nozzle molding space 12 . 13 is a support frame provided on the blow molding die body 10, and an integrated cylinder 14 is attached to this support frame 13. This integrated cylinder 14
The driving pin driving cylinder part 15 and the post-driving core driving cylinder part 16 are provided coaxially in the front and rear. A driving pin 17 is provided so as to be movable back and forth with its own central axis aligned with the central axis of the nozzle forming space. 18 is the post-driving core, and the driving pin 17
It is fitted onto the outside of the drive pin 17 and is movable back and forth along the driving pin 17. This driving pin 17 and post-driving core 18
The rear part of each is a driving pin driving cylinder part 15.
and each piston rod of the post-stroke core driving cylinder section 16, and is driven by the oil pressure of the respective cylinder section 15,16. A nozzle forming portion 12a is formed between the large diameter portion of the inner peripheral surface of the tip of the post-driving core 18 and the outer peripheral surface of the driving pin 17. The driving pin driving cylinder part 15 and the post-driving core driving cylinder part 16 each have a first. Second. Third. A fourth oil supply/drainage port is provided, through which pressurized oil is delivered and discharged. In addition, 23 is a patchkin, and 24 is a parison.

In this configuration, blow molding is performed as follows. That is, after the injection of the parison 24 is completed, the mold body 1
Close 0. Next, the cylinder part for driving the driving pin]5
Pressure oil is fed into the cylinder part 15 from the first oil feed/discharge port 19 to press the piston, and the driving pin 17 is driven into the cavity 11 at high speed. In this case, the end of the parison 24 is torn as shown in the figure by the tip of the driving pin 17. Next, pressurized oil is sent from the third oil supply/discharge port 21 of the cylinder section 16 for driving the after-stroke core, and the after-stroke core 18 is driven in the direction of the cavity 11, and the large diameter part of the inner peripheral surface of the tip thereof is driven in. The end of the parison 24 is pushed into the nozzle forming part 12a between the outer circumferential surface of the pin 17 to form a nozzle.

Perform blow blowing in this state. After the cooling is completed, the second oil supply and discharge date 20 of the driving pin driving cylinder part 15 is completed.
The driving pin 17 is moved back by sending pressure oil from there.

After that, after cooling and shrinking the nozzle of parison 24,
Pressure oil is sent from the fourth oil supply/discharge port 22 of the post-stroke core driving cylinder section 16 to move the post-stroke core 18 backward, and then the mold body 10 is opened to take out the molded product. Blow molding is performed in this manner, and a blow molded product having a nozzle is obtained.

Next, when forming a thread on the outer peripheral surface of the nozzle of a blow-molded product, a device as shown in FIG. 6 is used. This device is constructed as follows. That is, the driving pin driving cylinder 15 is attached to the support frame 13 attached to the blow molding mold body 10, and the driving pin 1 is
7 is formed into the piston rod of this cylinder 15. A post-striking core support shaft 13a having a thread on the outer peripheral surface is provided coaxially with this driving pin driving cylinder 15, and a post-striking core 18 is screwed onto this post-striking core support shaft 13a. This after-striking core 18 is provided with teeth parallel to the shaft on its outer circumferential surface, and the teeth of a gear 26 driven by a motor 25 mesh with the teeth on the outer circumferential surface, and are rotationally driven by the rotation of the motor 25. It is now possible to do so. Further, the inner circumferential surface of the tip end projection of the post-strike core 18 is formed with a threaded portion 12b. Since the other parts are the same as the apparatus shown in FIG. 5, their explanation will be omitted.

In this device, pressurized oil is supplied from the first oil supply/discharge port 19 of the driving pin driving cylinder O 15 to drive the driving pin 17, and then the motor 25 is rotated to drive the post-driving core 18. The parison 24 is moved forward while being rotated, and the end of the parison 24 is press-fitted into the nozzle forming part 12a to form a nozzle, and at the same time, a thread is formed on its outer peripheral surface. Then, blowing is performed in this state, and after cooling is completed, pressure oil is sent from the second oil supply/discharge port 20 of the driving pin driving cylinder 15 to move the driving pin 17 backward, and then the motor 25 is reversely turned. The post-hitting core 18 is rotated and moved backward. Then, by opening the mold body 10 and taking out the molded product, a molded product with a thread formed on the outer peripheral surface of the nozzle is obtained.

〔Effect of the invention〕

As described above, the blow molding method and mold device of the present invention are such that the rear part of the driving pin is formed on the piston rod of the driving pin driving cylinder, and the rear part of the driving pin is provided coaxially with the driving pin. Since the post-stroke core is moved by a drive source that acts directly on it, the cylinder installation can be done with less slippage. Therefore, problems such as an increase in the number of protrusions on the equipment, which makes the molding operation difficult, a complicated hydraulic piping, and a complicated fixing of the cylinder, can be solved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the conventional example, Figs. 2 and 3 are explanatory diagrams of its operation, Fig. 4 is an explanatory diagram of the driving pin and post-driving core holding mechanism, and Fig. 5 is an explanatory diagram of the conventional example. An explanatory diagram of one embodiment of such a blow molding mold apparatus, and FIG. 6 is an explanatory diagram of another embodiment. 10...Mold body for blow molding 12...Space for nozzle forming 12a...Nozzle forming part 14...Integrated cylinder 15...Cylinder part 1 for driving the driving bottle
6... Cylinder part for driving the post-stroke core 17... Drive pin 18... Post-stroke core 24... Parison agent Patent attorney Takehiko Matsumoto 2 Tekisenichi Masaharu: (Voluntary) 11 Answer r December 22, 159 Commissioner of the Japan Patent Office 1. Indication of the case 3. Person making the amendment Relationship with the case Appointment of patent applicant Location 1048 Kadoma, Kadoma City, Osaka Name (5)
83) Matsushita Electric Works Co., Ltd. Representative Representative Director Iku Kobayashi (ha'/, &) 4, No agent 6, Specification subject to amendment 7, Contents of amendment fil On page 5, line 2 of the specification "Up and down" should be replaced with "
"Line them up," I corrected.

Claims (1)

[Claims] (In blow molding a molded product having 11 nozzles,
A driving pin is inserted into the nozzle molding part so as to break through the parison in the nozzle molding part of the mold, and the core fitted on the driving pin is inserted into the nozzle molding part along the driving pin. This blow molding method is characterized in that the driving pin is driven by a cylinder whose rear part is a piston rod, and the post-driving core is driven by a driving means that acts directly on it. Blow molding method. (2) A cylindrical nozzle molding space is formed in the blow molding mold body, and the driving pin, which is set to a diameter smaller than the diameter of the nozzle molding space, connects its own central axis to the nozzle molding space. A cylindrical post-driving core, whose outer diameter is set to be smaller than the diameter of the nozzle molding space, is provided so that it can be moved back and forth while aligned with the center axis of the nozzle. The rear part of the post-driving core is formed on the piston rod of the post-driving core driving cylinder, which is fitted coaxially with the driving pin, and the rear part of the post-driving core is formed coaxially with the driving pin. A blow molding mold device characterized in that the blow molding mold device is formed on a piston rod of a driving pin driving cylinder provided therein. (3) A cylindrical nozzle molding space is formed in the blow molding mold body, and a driving pin whose diameter is smaller than the diameter of the nozzle molding space aligns its own central axis with the nozzle molding space. A cylindrical post-driving core, whose outer diameter is set to be smaller than the diameter of the nozzle molding space, is provided so that it can be moved back and forth while aligned with the center axis of the nozzle. The post-driving core is fitted externally and is configured to be screwed back and forth to a post-driving core support shaft provided coaxially with the driving pin, and the rear part of the driving pin is connected to the driving pin. A blow molding mold device characterized in that it is formed on a piston rod of a cylinder for driving a driving pin, which is provided coaxially with a driving pin.