JPH0341052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a blow molding apparatus having attached parts inside a molded product.

(Prior art) As a conventional blow molding device, for example,
The ones shown in Fig. 5 and Fig. 5 are known.
This conventional blow molding device has molds 01 and 01.
, an accessory part 03 built into the resin body 02, and recesses 04, 0 provided at the upper and lower ends of the accessory part 03.
4, and the recesses 14, 04 are provided in the mold 01, and the recesses 14, 04 are removed from the stored state located inside the mold 01.
Movable core 0 that can slide to a protruding state close to
5.05.

Therefore, the resin body 02 is formed by the molds 01, 01.
After the mold is clamped and air is sent into the inside of the resin body 02 to press it to the molds 01, 01, the movable cores 05, 05 are slid in the direction of the recesses 04, 04,
It was possible to press the resin body 02 into the recesses 04, 04, and then the movable cores 05, 05 were slid back to the stored state and the molded product was released.

(Problem to be solved by the invention) However, in such conventional blow molding equipment, movable cores are provided above and below the mold and around the entire circumference, and the movable core is provided in a protruding state to leave a thick resin. Since the movable core must be placed close to the recess, it takes a lot of time to manufacture the mold and increases the manufacturing cost of the mold.In addition, in the molding process of the molded product, the movable core must be remolded. There was a problem that the process of returning the product to the mold was necessary, which increased the number of processes.

(Means for Solving the Problems) Therefore, in order to solve the above-mentioned problems, the present invention provides a mold for molding a resin body, an accessory part built in the molded resin body and a hollow part. and a recess formed at the end of the accessory part, and a blowing needle for blowing air into the hollow part, and the blow molding apparatus is partitioned by the recess, the hollow part, and the accessory part. An air passage is provided in at least one side, the tip of the air passage is opened facing the recess to form an air blowing port, and an air passage hole is provided in the accessory part to communicate the recess and the hollow part. I decided to do so.

(Function) Therefore, the mold is clamped, air is blown into the hollow part of the resin body with a blowing needle to press the resin body to the mold, and then the air is passed through the air passage provided in the mold and attached from the air blowing port. Air is blown into the recess of the component, thereby making it possible to press the resin body into the recess and guide the air between the resin body and the recess into the hollow through the air passage hole.

(Example) Hereinafter, an example of the present invention will be shown in FIGS. 1 to 3, and its structure will be explained in detail.

Reference numeral 1 denotes a resin body made of softened thermoplastic resin, which is led out into a cylindrical shape from a nozzle 2 provided at the top.

3, 3 are molds for molding the resin body 1 into the shape of a mold surface 31 provided inside, and are provided facing each other on the left and right sides.

Reference numeral 4 denotes a core material as an accessory part, which is made of iron and is built into the hollow part 5 of the resin body 1 molded by the molds 3, 3 to reinforce the molded product. So, this core material 4 is the first core material 4
1 and the second core material 42 are integrally aligned with magnets 6, 6, and recesses 7, 8 are formed at the upper and lower ends, and recesses (not shown) are also formed at the front and rear ends, and the recesses are completely closed. Storage parts 9, 9 for storing the magnets 6, 6 are provided along the circumference.

Moreover, air conduction holes 10, 10, 10, 10 are provided in the recesses 7, 8 of the core material 4, and a fixing groove 81 is formed in the recess 8.

11 is a blowing needle which blows air into the hollow part 5 of the resin body 1 and blows the resin body 1 into the molds 3 and 3.
The nozzle 2 is crimped onto the mold surfaces 31, 31 of the nozzle 2, and is suspended from the center of the nozzle 2.

12 is a fixing device for fixing the core material 4;
, an oil-operated drive section 122 that moves the fixture 121 up and down, a supply pipe 123 that supplies hydraulic pressure to the drive section 122 , and the fixture 121 and the drive section 1 .
22.

13, 13 are air passages, and the molds 3,
The air passages 13, 13 have their tips facing the recesses 7, 8 to form air blowing holes 131, 131, 131, 131, and their base ends facing the air pipes 14, It is connected to 14.

Next, the operation of the embodiment will be described.

First, as shown in FIG. 1, a cylindrical softened resin body 1 is passed through a nozzle 2 provided above a core material 4 that has been fixed in advance by a fixing device 12.
It is led out downward so as to wrap around the core material 4.

Next, as shown in FIG. 2, after the molds 3, 3 are clamped, compressed air of about 5 atmospheres is fed from the blowing needle 11 to blow the resin body 1 onto the mold surface of the molds 3, 3.
1, 31 are crimped.

The inside of the resin body 1 is divided into a hollow part 5, a part surrounded by the recess 7 of the core material 4 and the resin body 1, and a part surrounded by the recess 8 of the core material 4 and the resin body 1. However, the compressed air blown into the section of the recess 7 by the blowing needle 11 is guided to the hollow part 5 through the air passage holes 10, 10, and the compressed air in the hollow part 5 is passed through the air passage holes 10, 10. through which it is guided into the compartment of the recess 8.

Next, as shown in FIG. 3, the air pipe 14,
When compressed air with a pressure higher than the pressure in the hollow part 5 (5 to 7 atmospheres) is sent from 14 to the air passages 13 and 13,
The compressed air is blown into the molds 3, 3 through the air blowing ports 131, 131, 131, 131 facing the recesses 7, 8, and the resin body 1 located outside the recesses 7, 8 is inserted into the recesses 7, 8. It can be crimped.

At this time, the air located between the recesses 7 and 8 and the resin body 1 is moved into the hollow part 5 through the air passage holes 10 and 10.

After that, after opening the molds 3, 3, the fixing device 121 of the fixing device 12 is lowered by hydraulic drive to take out the molded product, and the molding is completed. material 4 as the first core material 4
The outer resin is cut so as to be divided into the core material 1 and the second core material 42, and the molding is completed as two molded products.

Note that the magnets 6, 6 are removed from the core material 4 and used again to integrate another first core material and a second core material.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, the accessory part is not limited to the core material 4, but may also be a bracket for attaching the molded product to another member.

Further, the blowing needle 11 may be provided not on the nozzle 2 side but integrally with the fixing tool 121 of the fixing device 12.

(Effects of the Invention) As described above, according to the present invention, since the movable core is not provided in the mold, the labor of manufacturing the movable core and the mold is reduced, and the manufacturing cost is reduced. Since the resin body is pressed into the concave portion of the part by air pressure, there is no need for a step of removing the pressure force such as returning the movable core into the mold, resulting in the effect that the number of manufacturing steps can be reduced.

[Brief explanation of the drawing]

1 to 3 are sectional views showing the operation of a blow molding apparatus according to an embodiment of the present invention, and FIGS. 4 and 5 are sectional views showing the operation of a conventional blow molding apparatus. 1... Resin body, 3... Molding mold, 4... Core material (attached parts), 7, 8... Recess, 10... Air conduction hole,
11... Blowing needle, 131... Air blowing port.

Claims (1)

[Claims] 1. Comprising a mold for molding a resin body, an accessory built into a hollow part of the molded resin body, a recess formed at the end of the accessory part, and a blowing needle for blowing air into the hollow part. , in a blow molding device in which the recessed part and the hollow part are partitioned by an accessory part, an air passage is provided in at least one of the molds, and the tip of the air passage is opened facing the recessed part to blow air. A blow molding apparatus characterized in that the accessory part is provided with an air conduction hole that communicates the recessed part and the hollow part.