JP3060342B2 - How to remove sprue - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for removing sprues.

[0002]

2. Description of the Related Art A sprue a generated after completion of molding in injection molding is conventionally removed from a mold c by gripping it with a handling b as shown in FIG . The illustrated mold c has a lower mold d and an upper mold e, and forms a molded product in which a conical rubber g is adhered to an upper surface of an insert fitting f.

[0003]

In the above prior art, if the sprue a is made small in order to improve the yield, it becomes difficult for the handling b to grasp the sprue a, so that it is difficult to remove the sprue a. There is a problem that the handling device becomes complicated when trying to move the handling b accurately with respect to the small sprue a.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention has been devised to solve the above-mentioned problems in the prior art. Place a film with a hole in the part, perform nozzle touch through the film, perform injection through the hole, and after molding is completed, remove the film from the mold together with the sprue fixed to the film. And a method for removing the same.

[0005]

When the film is removed from the mold after completion of the molding, the sprue fixed to the film can be removed at the same time, so that the handling device can be omitted.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows an apparatus used for carrying out the removing method according to the embodiment, and FIGS. 2 to 4 show the operation thereof. Reference numeral 1 denotes a mold having a lower mold 2 and an upper mold 3 as in the conventional example, and a conical rubber 5
To form a molded article to which is adhered. A nozzle touch section 6 is provided on the upper surface of the upper mold 3. The rubber 5 may be a resin instead. 7 is a nozzle. A delivery roll 9 for delivering a flexible film 8 made of resin, paper, or the like is arranged alongside the mold 1 and a take-up roll 10 is provided on the opposite side.
Are arranged, and a perforation roll 11 is disposed between the delivery roll 9 and the mold 1. A plurality of needles 13 for making holes 12 (see FIG. 2) in the film 8 are provided on the peripheral surface of the hole forming roll 11.

The film 8 is moved by simultaneously rotating the three rolls 9, 10, and 11, and a hole 12 is formed in the film 8 with a needle 13 in the middle of the movement. When the hole 12 reaches the center of the mold 1, The movement of the film 8 is temporarily stopped.
In this state, a nozzle touch is performed through the film 8 (FIG. 2), an injection is performed through the hole 12 (FIG. 3), and after the molding is completed, the nozzle 7 is removed and the film 8 is moved again. The sprue 14 fixed in the vicinity of the hole 12 is removed from the mold 1 (FIG. 4), and the sprue 14 is wound around a winding roll 10. Therefore, according to the method, it is possible to simplify the mechanical structure because the handling device can be omitted, and to improve the yield because the sprue 14 can be reduced without hesitation. Can be.

[0009]

The present invention has the following effects. That is,
Since the sprue is removed from the mold at the same time as the film, the handling device is omitted, so that the mechanical structure can be simplified. Further, since the sprue can be reduced, the yield can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of an apparatus used for performing a removal method according to an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the device.

FIG. 3 is a diagram illustrating the operation of the device.

FIG. 4 is a diagram illustrating the operation of the device.

FIG. 5 is a configuration explanatory view of an apparatus showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die 2 Lower die 3 Upper die 4 Insert metal fittings 5 Rubber 6 Nozzle touch part 7 Nozzle 8 Film 9 Delivery roll 10 Take-up roll 11 Punch roll 12 Hole 13 Needle 14 Sprue

Claims (1)

(57) [Claims] 1. A film 8 having a hole 12 is arranged in a nozzle touch portion 6 of a mold 1, a nozzle touch is performed through the film 8, and an injection is performed through the hole 12.
After the molding is completed, a sprue removing method for removing the film 8 from the mold 1 together with the sprue 14 fixed to the film 8.