JP2007050681A - Bent hole member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vent hole member constituted so as to simply remove the mushroom-shaped leaked matter, that is, the foam refuse formed by the overflow of a molten resin from the vent hole member while putting an advantage capable of simply replacing a valve body, that is, the vent hole member to practical use not only to simplify troublesome work like cutting work but also to improve the work efficiency accompanied by replacement frequency to certainly discharge a gas. <P>SOLUTION: A screw part 5 is provided to the outer peripheral part of an almost cylindrical vent hole member body 1, and a vent hole 2 for discharging the gas and a foam refuse placing part 3 for receiving the foam refuse are formed in the vent hole member body 1. The vent hole 2 shows an almost conical hole shape made gradually small in diameter upward and the foam refuse placing part 3 is formed to the upper part of the vent hole 2 so as to communicate with the vent hole 2. A cutting edge part 9 is provided to the communication part of the foam refuse placing part 3 and the vent hole 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vent hole member for discharging residual gas generated when molding resin, particularly foamed resin (urethane or the like).

  Resin molding Especially when foamed resin (urethane etc.) is molded, gas is generated in the molding die. Since this gas remains in the molding die and adversely affects the molded product, how to effectively discharge the gas out of the die is one of the important issues during molding. As a method for discharging such a gas, a conventionally performed method is to provide a small hole (vent hole) at an appropriate position of the mold and discharge the gas from the small hole. In such a method, the expanded contents after the gas is discharged, that is, the melted resin enters the small holes, not only closes the small holes, but also overflows from the small holes, and mushroom-like leakage That is, a foam residue is formed. Since this foam residue is connected to the molded product, it must be cut to release the molded product, which necessitates a troublesome work such as a cutting operation, which adversely affects the work efficiency.

  In recent years, improvements have been made to such conventional techniques, that is, techniques relating to gas discharge methods. For example, a valve body is detachably provided in a vent hole of a mold (upper mold), a threaded portion that is screwed into the vent hole is formed on the outer peripheral edge of the valve body that is a cylindrical body, and a porous portion is formed inside. Some are filled with quality materials. With this configuration, the gas is discharged from the communication hole of the porous material, and the overflow of the molten resin is prevented, and at the same time, the valve body can be easily replaced. . (See Patent Document 1)

JP 10-6344 A

  However, the configuration of filling the inside of the cylindrical valve body with a porous material requires a relatively advanced molding technique, and accordingly, the management in the molding stage becomes troublesome, and therefore, it is expensive. It will never be advantageous. In addition, since the extremely small communication hole of the porous material is used, it is possible to prevent the molten resin from overflowing while allowing the gas to be discharged from the mold. The extremely small communication hole is closed immediately, and the valve body must be replaced frequently, which is not advantageous in terms of working efficiency. And since a communicating hole will be plugged up immediately, it may also be that gas discharge is not fully performed.

  In view of the problems of the prior art, the present invention takes advantage of the fact that the valve body, that is, the vent hole member, can be easily replaced, while the mushroom-like shape generated by the overflow of the molten resin from the vent hole member. A vent hole that makes it possible to easily remove leaked material, that is, foam residue, thereby simplifying troublesome work such as cutting work, improving work efficiency associated with replacement frequency, and reliably discharging gas. The object is to provide a member.

  In order to achieve the above object, the invention according to claim 1 is provided with a substantially cylindrical vent hole member main body and a threaded portion provided on the outer peripheral portion of the vent hole member main body, and for exhausting gas therein. A foam residue mounting portion that receives the vent hole and the foam residue is formed, and the vent hole has a substantially conical hole shape that gradually decreases in diameter as it goes upward, and is formed above the vent hole. Is formed such that a foam residue mounting portion communicates with the vent hole, and a cut edge portion is provided at a communication portion between the foam residue placement portion and the vent hole. With this configuration, even if the melted resin overflows from the vent hole and a mushroom-like leaked material, that is, foam residue, is generated, it is a communication portion between the foam residue mounting portion and the vent hole. Since the cutting edge portion is formed with a small diameter and is firmly placed on the foam residue mounting portion, the removal operation of the foam residue can be easily performed. Compared to extremely small communication holes such as porous materials, not only gas is discharged smoothly, but there is less clogging of the molten resin into the vent hole. Therefore, it is easy to remove, the exchange of the vent hole member is reduced, and the working efficiency associated with the exchange frequency can be improved.

  According to the second aspect of the present invention, the flange portion is formed on the upper portion of the substantially cylindrical vent hole member main body. With this configuration, when the vent hole member is screwed into the molding die, the collar portion comes into contact with the mold surface to notify the end of the screwing. Can be securely attached.

  Since the present invention is configured as described above, the following effects can be obtained.

  In the vent hole member according to claim 1, a substantially cylindrical vent hole member main body and a screw portion are provided on an outer peripheral portion of the vent hole member main body, and a vent hole for discharging gas is provided therein. A foam residue mounting portion for receiving the foam residue is formed, and the vent hole has a substantially conical hole shape whose diameter is gradually reduced in the upward direction. The body residue mounting portion is formed so as to communicate with the vent hole, and the cutting edge portion is provided at the communication portion between the foam residue placing portion and the vent hole, so that the removal operation of the foam residue is easily performed. Therefore, the vent hole is less clogged with molten resin, and even when it is clogged, it can be easily removed, the vent hole member is less replaced, and the work efficiency associated with the replacement frequency is improved. From that can, inexpensively it can provide a molded article as seen in a total manner. Furthermore, since the gas is smoothly discharged and the structure is simple, the price of the vent hole member can be provided at a low price.

  In the vent hole member according to claim 2, since the flange portion is formed at the upper part of the substantially cylindrical vent hole member main body, the vent hole member can be easily and reliably attached to the molding die. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of a vent hole member according to the present invention, and is a cross-sectional view when viewed from the side. FIG. 2 is a cross-sectional view showing an embodiment of a use example of the vent hole member according to the present invention. 3 shows another embodiment of the vent hole member according to the present invention, wherein (a) is a foam residue mounting portion having a sliver shape, (b) is an abandoned collar portion, and (c) is a cutting edge. A straight part is formed on the part.

  As shown in FIG. 1, the vent hole member 10 is provided with a substantially cylindrical vent hole member main body 1 and a flange portion 4 on the upper portion of the vent hole member main body 1, and a screw portion 5 on the outer periphery below the flange portion 4. It is formed as what provided. The inside of the substantially cylindrical vent hole member main body 1 enters the vent hole 2 after the vent hole 2 which is a hole for discharging the gas generated in the mold at the time of molding the foamed resin and the gas is discharged. The incoming molten resin is constituted by the foam residue mounting portion 3 that receives the foam residue produced by overflowing the molding die. As can be seen from FIG. 1, the vent hole 2 is gradually reduced in diameter as it goes upward by the inclined surface 6 and has a substantially conical hole shape. It communicates with the foam residue mounting portion 3 having a hole shape formed in a shape. The communicating portion between the foam residue mounting portion 3 and the vent hole 2 is a cutting edge portion 9, which is a point of the vent hole member 10 according to the present invention. The material of the vent hole member 10 may be a resin material such as polypropylene, Teflon or nylon, and a metal material such as stainless steel, iron or yellow steel.

  Next, how the vent hole member 10 according to the present invention is used will be described with reference to FIG. 2. Before the description, the development concept of the vent hole member 10 according to the present invention will be described. Let's talk about. As described above, the greatest role of the vent hole (vent hole member) is to discharge the gas generated in the molding die to the outside of the die during resin molding, particularly foamed resin molding. Along with this, the treatment of foam debris made of molten resin overflowing from the vent hole is also an important role. Needless to say, in order to discharge the gas, a hole through which the gas passes is necessary. Therefore, it is necessary to cope with the conflicting phenomenon of passing gas but not molten resin. As a result of careful consideration, the applicant is not limited to the fact that the role of the vent hole allows gas to pass through but does not allow molten resin to pass through. If it was forcibly prevented, it was judged that inconvenience would occur in other aspects, and the idea was changed to accept the overflow of molten resin and the accompanying generation of foam residue. As described above, the reason for preventing the generation of the foam residue is that a troublesome work of cutting the foam residue connected to the molded product is required when releasing the molded product. The present applicant has come up with the idea that the foam residue should be cut or removed very easily based on a change in concept.

  In FIG. 2, reference numeral 11 denotes a molding die (upper die), and the molding die 11 is provided with small holes (not shown, but actually a plurality of small holes) in which female screws are formed. The vent hole member 10 is screwed into the hole with the screw portion 5. Reference numeral 7 denotes a molten resin (foamed resin) which enters the vent hole 2 of the vent hole member 10 and is narrowed down by the slope portion 6, passing through the cutting edge portion 9 and passing through the foam residue mounting portion 3. The foam residue 8 is made. What is important here is that the diameter of the vent hole 2 is reduced as it goes upward, and the communicating portion with the foam residue mounting portion 3 is a cut edge portion 9. Since the thickness (diameter) of the cut edge portion 9 in the foam residue 8 is very small due to the cut edge portion 9, the foam residue 8 can be removed very easily. become able to do. In addition, the foam residue 8 is not placed on the top of the vent hole member 10 freely by the foam residue placement portion 3, but is placed properly by the foam residue placement portion 3. This leads to improved workability when removed.

  Subsequently, another embodiment of the vent hole member of the present invention will be described with reference to FIG. The vent hole member taken up here has a substantially cylindrical vent hole member main body and a screw part on the outer periphery of the vent hole member main body, and a foam residue mounting for receiving the conical vent hole and the foam residue inside. The basic structure having a portion is the same as the vent hole member 10 already described.

  The vent hole member 20 shown in FIG. 3 (a) has a flange 24 at the top of the vent hole member main body 21, and a screw portion 25 is formed on the outer periphery of the lower side of the flange 24. Yes. In the inside of the cylindrical shape, the vent hole 22 and the foam residue mounting portion 23 are both formed as a substantially conical hole shape having a diameter gradually reduced toward the cutting edge portion 29.

  The vent hole member 30 shown in FIG. 3B is formed as a cylindrical shape with the collar portion omitted, and a threaded portion 35 is formed on the outer peripheral portion of the vent hole member main body 31. Both the vent hole 32 and the foam residue mounting portion 33 have a substantially conical hole shape with a diameter gradually decreasing toward the cutting edge portion 39.

  The vent hole member 40 shown in FIG. 3C is formed in a substantially cylindrical shape, a screw portion 45 is formed on the outer periphery of the vent hole member main body 41, and the inside of the cylindrical shape is a vent hole 42. In the same manner as the vent hole member 20 and the vent hole member 30, the foam residue mounting portion 43 has a substantially conical hole shape with a diameter gradually decreasing toward the cutting edge portion 49. The cutting edge portion 49 is formed as a hole having a short straight portion, unlike the case of the vent hole member 10, the vent hole member 20, and the vent hole member 30. This is to improve the moldability of the vent hole member by providing the cutting edge portion 49 of the vent hole member 40 with a straight portion, and it can be applied to other embodiments. Nor. In addition, the position of the cutting edge portion in each embodiment shown in FIG. 3 is provided at a substantially intermediate position in the vertical direction, but this position is not particularly limited and may be changed as necessary. Needless to say, it is possible. Further, the vent hole member according to the present invention is attached to the molding die by screwing it into a small hole having a female screw portion provided in the die, but is a hole-like shape that is a foam residue mounting portion. It is also possible to make the part into a square shape such as a hexagonal shape instead of a cylindrical or conical shape, and if it is tightened with a screwdriver using this square hole, it can be easily and securely attached to the molding die. Since it can be done, I will add it just in case.

It is sectional drawing when one embodiment of the vent hole member by this invention is shown and it sees from the side surface. It is sectional drawing which shows one Embodiment of the usage example of the vent hole member by this invention. The other embodiment of the vent hole member by this invention is shown, (a) made the foam residue mounting part into the shape of a slit, (b) abolished the collar part, (c) to the cutting edge part A straight portion is formed.

Explanation of symbols

1, 21, 31, 41 Vent hole member main body 2, 22, 32, 43 Vent hole 3, 23, 33, 43 Foam residue mounting part 4 Gutter part 5, 25, 35, 45 Screw part 6, 26, 36 , 46 Slope part 7 Molten resin 8 Foam residue 9, 29, 39, 49 Cutting edge part 10, 20, 30, 40 Vent hole member 11 Mold (upper mold)

Claims (2)

  A substantially cylindrical vent hole member main body and a screw portion are provided on the outer periphery of the vent hole member main body, and a vent portion for discharging gas and a foam residue mounting portion for receiving the foam residue are formed in the inside. The vent hole has a substantially conical hole shape whose diameter is gradually reduced in the upward direction, and a foam residue mounting portion is communicated with the vent hole at an upper portion of the vent hole. A vent hole member formed and provided with a cutting edge portion at a communicating portion between the foam residue mounting portion and the vent hole.   The vent hole member according to claim 1, wherein a flange portion is formed on an upper portion of the substantially cylindrical vent hole member main body.

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