JP2018012275A - Vent piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vent piece inserted into a vent hall for suppressing formation of a spew by preventing rubber flowing into the vent hall while venting air or gas during vulcanization.SOLUTION: The vent piece which is inserted into a vent hall for venting gas arranged in a mold for vulcanization molding, has a cylindrical member and a sintering material filled at a position lower with a prescribed length from a top edge of the cylindrical member, the cylindrical member forms a top edge recess with a prescribed length from the top edge of the cylindrical member to an uppermost position, the top edge recess is constituted to project from a surface of the mold for vulcanization molding when the vent piece is inserted into the vent hall.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vent piece inserted into a vent hole for venting provided in a mold for vulcanization molding, and more particularly to a vent piece filled with a sintered material.

  In general, a tire is formed by applying heat and pressure to a raw tire placed in a tire vulcanization molding die to expand the raw tire, and the outer surface of the heated tire vulcanization molding die is exposed to the raw tire. It is formed by pressing the surface.

  At that time, air confined in the tire vulcanization mold or gas generated from the raw tire during vulcanization causes wrinkles and cracks in the tire, and deteriorates quality such as durability of the tire.

  To vent such air and gas, a plurality of vent holes are formed in the tire vulcanization mold, but the vent hole can vent air and gas, while the vent hole Rubber may flow into the.

  As a result, the rubber that has flowed into the vent hole forms spew (like a beard) on the tire. The spew formed on the tire needs to be removed in order to impair the appearance of the tire, and this excision operation has various problems such as a longer manufacturing time for tire manufacture and a higher manufacturing cost.

  Therefore, for example, it is possible to insert a vent piece composed of a vent hole, a discharge hole and a porous body into the vent hole so that air and gas escape while preventing rubber from flowing into the vent hole during vulcanization. It has been proposed (Patent Document 1).

JP 2007-62235 A

  However, in the vent piece described in Patent Document 1, it is possible to prevent the rubber from flowing into the porous body, but a part of the rubber flows into the vent hole, and as a result, spew is formed in the tire. A spew is formed on a tire that is short, and the spew impairs the aesthetics of the tire.For example, if the manufacturer's name is displayed on the side of the tire and the design of the tire is important, trim the spew. There is a problem that work will occur.

  Therefore, the present invention has been made in view of the above problems, and one of the objects of the present invention is to prevent rubber from flowing into a vent hole while venting air and gas during vulcanization. It is to provide a vent piece inserted into the vent hole, which prevents spew from being formed.

  In order to achieve the above object, the present invention comprises at least the following configuration or executes a procedure. In the following description, in order to facilitate the understanding of the present invention, reference numerals and the like shown in the drawings may be added, but each component of the present invention is limited to those shown in the drawings. It should be construed broadly to the extent that those skilled in the art can technically understand.

A vent piece according to one aspect of the present invention is a vent piece inserted into a vent hole for venting provided in a vulcanization mold, and is predetermined from a cylindrical member and an upper end of the cylindrical member. The cylindrical member is formed with an upper end convex portion having a predetermined length from the upper end of the cylindrical member to the uppermost position where the sintered material is filled. The upper end convex portion is configured to protrude from the surface of the vulcanization mold when the vent piece is inserted into the vent hole.
With this configuration, the vent piece according to one aspect of the present invention can prevent spew from being formed by preventing the rubber from flowing into the vent hole while venting air and gas during vulcanization. As a result, since the work of trimming the spew does not occur, the production efficiency is increased and the production cost is reduced.

Preferably, the cylindrical member is characterized in that the lower end opening is smaller than the upper end opening.
With this configuration, the sintered material filled in the cylindrical member is difficult to come out from the lower end opening even when a load is applied from the upper end opening, and when the vent piece inserted into the vent hole is taken out. Since the periphery of the lower end opening is covered with the cylindrical member, for example, the vent piece can be easily taken out from the lower end side using a rod-shaped member.

Preferably, the diameter of the lower end opening is 20 to 90% of the diameter of the upper end opening.
With this configuration, the sintered material filled in the cylindrical member is less likely to come out from the lower end opening even when a load is applied from the upper end opening, and the vent piece inserted into the vent hole is taken out. At this time, since the periphery of the lower end opening is covered with a certain width by the cylindrical member, the vent piece can be easily taken out from the lower end side by using, for example, a rod-shaped member.

Preferably, the cylindrical member has an upper region from the upper end of the cylindrical member to a lowest position where the sintered material is filled, and a lower end of the cylindrical member from the lowest position where the sintered material is filled. And the lower region has a cavity diameter smaller than that of the lower region.
With this configuration, the thickness of the lower region of the tubular member is larger than the thickness of the upper region, so that the sintered material filled in the tubular member is removed from the lower end opening. It is difficult, and when the vent piece inserted into the vent hole is taken out, the periphery of the lower end opening is covered with a certain width by the cylindrical member. It can be easily removed by poking the piece.

Preferably, the predetermined length is ½ or less of the diameter of the upper end opening of the cylindrical member.
With this configuration, when the vent piece is inserted into the vent hole, the upper end convex portion corresponding to a predetermined length protrudes from the surface of the vulcanization mold. Then, the upper end convex portion is crushed or crushed to fill the gap between the vent hole and the vent piece, and the vent piece is attached to the vulcanization mold. At that time, the upper end convex portion to be crushed or crushed Since the length is ½ or less of the diameter of the upper end opening, at least the upper end opening is not blocked, and air and gas can be reliably extracted during vulcanization.

Preferably, the cylindrical member and the sintered material are metal.
With this configuration, the sintered material is not dissolved during vulcanization, and the pores of the sintered material are not blocked, so that air and gas can be surely removed.

Preferably, the sintered material is constituted by communication holes having a three-dimensionally combined pore structure.
With this configuration, there are an infinite number of inlets and outlets, preventing the rubber from flowing into the vent hole while venting air and gas during vulcanization, rather than a one-way or regular pore structure. can do.

Further, a vulcanization mold according to one aspect of the present invention is a vulcanization mold for forming an object generated from rubber or resin, and a vent hole for venting, A vent piece inserted into the vent hole, and the vent piece includes a cylindrical member and a sintered material filled in a position below the upper end of the cylindrical member by a predetermined length. The upper end convex portion having a predetermined length is formed from the upper end of the cylindrical member to the uppermost position where the sintered material is filled, and the upper end convex portion is configured to protrude from the surface of the vulcanization mold. It is characterized by.
With such a configuration, the mold for vulcanization molding according to one aspect of the present invention has a vent piece having an upper end convex part and filled with a sintered material inserted into a vent hole. By preventing the rubber from flowing into the vent hole while venting the gas, it is possible to prevent the spew from being formed. As a result, since the work of trimming the spew does not occur, the production efficiency is increased and the production cost is reduced.

Further, the vent piece attaching method according to one aspect of the present invention includes a tubular member and a vent hole provided in the vulcanization molding die for a predetermined length from the upper end of the tubular member and the tubular member. A vent piece attaching method for attaching a vent piece having a sintered material filled only in a lower position, wherein the vent piece is inserted into the vent hole, and among the vent pieces inserted into the vent hole, vulcanization molding gold The upper end convex portion of the cylindrical member protruding from the surface of the mold is crushed or crushed, and a part of the upper end convex portion of the cylindrical member crushed or crushed on the surface of the vulcanization mold is ground.
With such a configuration, the vent piece attachment method according to one aspect of the present invention is such that the upper end convex portion of the vent piece inserted into the vent hole is crushed or crushed and crushed or crushed on the surface of the vulcanization mold. By grinding a part of the upper end convex part, it is possible to prevent spew from being formed by preventing the rubber from flowing into the vent hole while venting air and gas during vulcanization. As a result, since the work of trimming the spew does not occur, the production efficiency is increased and the production cost is reduced.

As described above, according to the present invention, the vent piece inserted into the vent hole prevents the spew from being formed by preventing the rubber from flowing into the vent hole while extracting air or gas during vulcanization. Can be realized.
As a result, since the work of trimming the spew does not occur, the production efficiency is increased and the production cost is reduced.

It is an appearance perspective view showing vent piece 100 concerning one embodiment of the present invention. It is a perspective view which shows the internal structure of the vent piece 100 which concerns on one Embodiment of this invention. It is sectional drawing which shows the internal structure of the vent piece 100 which concerns on one Embodiment of this invention. It is a flowchart which shows the procedure of the vent piece attachment method 200 concerning one Embodiment of this invention which attaches a vent piece to the metal mold | die for vulcanization molding provided with the vent hole. It is a figure which shows a mode that the vent piece 100 which concerns on one Embodiment of this invention is attached to the metal mold | die for vulcanization molding provided with the vent hole.

  Embodiments of the present invention will be specifically described below with reference to the drawings. The embodiment described below is merely a specific example for carrying out the present invention, and is not intended to limit the present invention.

[Bent piece structure]
FIG. 1 is an external perspective view showing a vent piece 100 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an internal structure of the vent piece 100 according to an embodiment of the present invention. 1 and 2, the vent piece 100 includes a cylindrical member 110 and a sintered material 120, and the sintered member 120 is filled in the cylindrical member 110.

  The cylindrical member 110 is generally columnar in appearance, and originally has a hollow inside and has an upper end that is larger than the lower end.

  Specifically, the cylindrical member 110 is formed such that the thickness of the upper region where the sintered material 120 is filled is thinner than the thickness of the lower region where the sintered material 120 is not filled. There is a step at the boundary with the lower region. In other words, it can be said that the level difference functions as a stopper without the sintered material 120 falling off in the lower end direction.

  In addition, the cylindrical member 110 has different thicknesses in the upper region and the lower region. However, even if the cylindrical member 110 has a stopper function to prevent the sintered material 120 from falling out in the lower end direction, even if it has a uniform thickness. I do not care. For example, any other shape may be used as long as the upper end is opened larger than the lower end, such as a substantially conical shape or a truncated cone shape with a tapered shape at the bottom.

  Furthermore, the appearance of the cylindrical member 110 is a columnar shape, but is not limited to the columnar shape, and if it matches the shape of the vent hole, the cylindrical member 110 has a quadrangular prism shape, a quadrangular pyramid shape, It may be a quadrangular frustum shape, other polygonal column shapes close to a circle, a polygonal pyramid shape, a polygonal frustum shape, or the like.

  Since the sintered material 120 has a function of preventing rubber from flowing in while evacuating air and gas during vulcanization, if there is a gap between the sintered material 120 and the cylindrical member 110, the gap There is a risk of rubber flowing in from. For this reason, it is preferable that the sintered material 120 is configured so as to be disposed on the inner diameter of the cylindrical member 110 without any gap. However, as will be described later, the upper end convex portion of the cylindrical member 110 is crushed or crushed. As a result, the rubber can be prevented from flowing from the gap between the sintered material 120 and the cylindrical member 110.

  The sintered material 120 is preferably constituted by a communication hole having a three-dimensionally combined pore structure, and has a greater number of inlets and outlets than a pore structure provided in one direction or regularly. It becomes the structure which exists in.

  In addition, as long as the sintered material has a function of preventing the rubber from flowing in while evacuating air and gas at the time of vulcanization, any material may be used. Those having a pore structure that blocks 80% or more of foreign matters of 0.5 to 200 microns are preferable.

Furthermore, the structure of the vent piece 100 will be described in detail.
FIG. 3 is a cross-sectional view showing the internal structure of the vent piece 100 according to an embodiment of the present invention. In FIG. 3, the vent piece 100 includes a cylindrical member 110 and a sintered material 120, and the cylindrical member 110 includes an upper end opening 111, a lower end opening 112, an upper region 113, and a lower portion. Region 114. Further, the upper region 113 includes an upper end convex portion 113A.

  Since the upper region 113 is thinner than the lower region 114, the upper end opening 111 is configured to be larger than the lower end opening 112.

  Thereby, since there is a step at the boundary portion between the upper region 113 and the lower region 114, the sintered material 120 functions as a stopper without falling off in the lower end direction.

  Further, when the vent piece 100 inserted into the vent hole is taken out during maintenance or the like, the vent piece 100 (cylindrical member) is used from the lower end side by using, for example, a rod-like member because there is a thickness around the lower end opening 112. The thick part at the lower end of 110 can be easily picked out.

  The diameter of the lower end opening 112 is approximately 20 times the diameter of the upper end opening 111, depending on the shape, size, material, and other conditions of the tire production machine, the production environment, and the rod shape and material. If it is about -90%, it can be efficiently and easily taken out by sticking the vent piece 100 from the lower end side using a rod-shaped one. As an example, when the diameter of the upper end opening 111 is about 4 mm, the diameter of the lower end opening 112 is preferably configured to be about 1 to 3 mm.

  The upper end convex portion 113A is an upper end portion of the upper region 113 of the cylindrical member 110 and is a portion from the upper end of the cylindrical member 110 to the uppermost position where the sintered material 120 is filled. When the vent piece 100 is inserted into the vent hole, the upper end convex portion 113A is a portion that protrudes from the surface of the vulcanization mold. After the vent piece 100 is inserted into the vent hole as will be described later, Or it is the part that is crushed. In other words, when the vent piece 100 is inserted into the vent hole, the upper surface of the sintered material 120 is flush with the surface of the vulcanization mold, and the upper end protrusion 113A is the surface of the vulcanization mold. It will protrude from.

  The upper end convex portion 113A is a portion that is crushed or crushed after the vent piece 100 is inserted into the vent hole, and may clog the upper end opening 111 depending on the state of deformation. Therefore, the length of the upper end convex portion 113A is the same as the diameter of the upper end opening portion 111 so as to block the upper end opening portion 111 and prevent air and gas from escaping during vulcanization even after being crushed or crushed. It is made to constitute about 1/2 or less.

As described above, according to the vent piece 100, the vent inserted into the vent hole prevents the spew from being formed by preventing the rubber from flowing into the vent hole while extracting air or gas during vulcanization. A piece can be realized.
As a result, since the work of trimming the spew does not occur, the production efficiency is increased and the production cost is reduced.

  The vent piece 100 is made of, for example, a metal material such as stainless steel, titanium, aluminum, bronze (bronze), copper, and nickel. In view of rust prevention, material cost, and market volume, stainless steel, aluminum, bronze ( Bronze) is preferred. The cylindrical member 110 and the sintered material 120 are preferably made of the same material in view of cost and ease of handling, but may be made of different materials depending on applications and situations.

  In particular, when the cylindrical member 110 and the sintered material 120 are made of a metal material, the pores of the sintered material 120 are not blocked particularly during vulcanization, so that air and gas can be reliably removed.

  Further, the size of the cylindrical member 110 in the vent piece 100 depends on the size and shape of the vulcanization mold or the vent hole of the vulcanization mold when producing a tire, but the diameter is approximately The length is 0.5 to 10 mm, and the length is about 3 to 25 mm.

  Furthermore, although the size of the sintered material 120 is also based on the size of the cylindrical member 110, in the length direction of the cylindrical member 110, the sintered material 120 may be almost filled up to just before the lowest end. However, in view of material cost, ease of production, and production efficiency, it is preferable to fill approximately 20% to 80% of the length of the cylindrical member 110, and approximately 50% is optimal.

  The vent piece 100 is used by being inserted into a vent hole for venting provided in the vulcanization mold. When a new vulcanization mold is manufactured, the vent piece 100 is vented in advance. The piece 100 may be attached to form a vulcanization mold with a vent piece attached, or the vent piece 100 may be attached to an existing vulcanization mold.

  Further, in recent years, tires (products) of different colors may be produced using the same vulcanization mold. If the vent piece 100 is used, the rubber used on the surface of the vulcanization mold and the inside of the vent piece 100 will not remain. Tires with different colors of rubber are never produced.

[Bent piece mounting method]
Next, a method for attaching the vent piece to the vent hole for venting provided in the vulcanization mold will be described.

  FIG. 4 is a flowchart showing a procedure of a vent piece attaching method 200 according to an embodiment of the present invention in which the vent piece is attached to a vulcanization mold having a vent hole, and FIG. It is a figure which shows a mode that the vent piece 100 which concerns on embodiment is attached to the metal mold | die for vulcanization molding provided with the vent hole.

  In FIG. 4, the vent piece attaching method 200 includes a vent piece inserting step S210, an upper end convex portion crushing / smashing step S220, and an upper end convex portion grinding step S230.

  In the vent piece insertion step S210, the vent piece is inserted into the vent hole (state (a) in FIG. 5 → state (b)). As shown in FIG. 5B, among the vent pieces inserted into the vent holes, the upper surface of the sintered material is flush with the surface of the vulcanization mold, and the upper end convex portion is the vulcanization mold. Protrudes from the surface.

  Here, it is preferable that the vent hole and the vent piece have substantially the same diameter so that there is no gap between the vent hole and the vent piece, but it may be difficult to make them completely coincide with each other due to manufacturing / parts variation or the like. . Therefore, depending on the material of the vent piece, the vent piece may be press-fitted and attached to the vent hole in consideration of slight deformation.

  In addition, here, the vent piece has a cylindrical shape, but the lower region may be made thin so that the vent piece can be easily inserted into the vent hole, or a conical shape or a truncated cone shape may be used. However, it is preferable to press-fit the upper end portion so that rubber does not flow into the gap between the vent hole and the vent piece during vulcanization.

  In the upper end convex portion crushing / smashing step S220, the upper end convex portion of the cylindrical member protruding from the surface of the vulcanization mold among the vent pieces inserted into the vent holes is crushed or crushed (FIG. 5 ( c) State). As described above, the upper end convex portion of the crushed or crushed cylindrical member fills the gap between the upper end portion of the vent hole and the vent piece and functions to fix the vent piece to the vulcanization mold. .

  In the upper end convex portion grinding step S230, a part of the upper end convex portion of the cylindrical member crushed or crushed on the surface of the vulcanization mold is ground (state shown in FIG. 5D). If the upper end convex part of the crushed or crushed cylindrical member protrudes greatly, the shape of the tire (product) to be generated is also affected, so the excess is ground. Thereby, it can avoid that the surface of the tire produced | generated becomes a concave shape.

  As described above, according to the vent piece 100 and the vent piece attachment method 200 according to an embodiment of the present invention, spew is formed by preventing the rubber from flowing into the vent hole while extracting air and gas during vulcanization. It is possible to realize a vent piece that is inserted into the vent hole to prevent it from being generated. As a result, since the work of trimming the spew does not occur, the production efficiency is increased and the production cost is reduced.

  The specific description of the embodiment of the present invention has been given above. The above description is merely an embodiment, and the scope of the present invention is not limited to this embodiment, but should be broadly interpreted to the extent that a person skilled in the art can grasp.

  INDUSTRIAL APPLICABILITY The present invention can be used for a vent piece or the like used in a vulcanization molding die, and is particularly useful for air or degassing during vulcanization.

DESCRIPTION OF SYMBOLS 100 Bent piece 110 Cylindrical member 111 Upper end opening part 112 Lower end opening part 113 Upper area | region 113A Upper end convex part 114 Lower area | region 120 Sintered material 200 Vent piece attachment method S210 Vent piece insertion process S220 Upper end convex part crushing / crushing process S230 Upper end Convex grinding process

Claims (9)

A vent piece inserted into a vent hole for venting provided in a mold for vulcanization molding,
A tubular member;
A sintered material filled in a lower position by a predetermined length from the upper end of the cylindrical member;
The cylindrical member forms an upper end convex portion having a predetermined length from the upper end of the cylindrical member to the uppermost position where the sintered material is filled,
The upper end convex part is configured to protrude from the surface of the vulcanization mold when the vent piece is inserted into the vent hole.   The vent piece according to claim 1, wherein the cylindrical member has a lower end opening smaller than an upper end opening.   The vent piece according to claim 2, wherein a diameter of the lower end opening is 20 to 90% of a diameter of the upper end opening.   The cylindrical member includes an upper region from the upper end of the cylindrical member to the lowest position where the sintered material is filled, and a lower region from the lowest position where the sintered material is filled to the lower end of the cylindrical member. The vent piece according to any one of claims 1 to 3, wherein the vent piece includes a lower region, and a cavity diameter of the upper region is smaller than a cavity diameter of the lower region.   The vent piece according to any one of claims 1 to 4, wherein the predetermined length is ½ or less of a diameter of an upper end opening of the tubular member.   The vent piece according to any one of claims 1 to 5, wherein the cylindrical member and the sintered material are metal.   The vent piece according to any one of claims 1 to 6, wherein the sintered material is constituted by a communicating hole having a three-dimensionally combined pore structure. A vulcanization mold for forming an object produced by rubber or resin,
A vent hole for venting,
A vent piece inserted into the vent hole,
The vent piece is
A tubular member;
A sintered material filled in a lower position by a predetermined length from the upper end of the cylindrical member;
The cylindrical member forms an upper end convex portion having a predetermined length from the upper end of the cylindrical member to the uppermost position where the sintered material is filled,
The upper end convex part is configured to protrude from the surface of the vulcanization mold, The vulcanization mold. A vent piece comprising a cylindrical member and a sintered material filled in a lower position by a predetermined length than the upper end of the cylindrical member in a vent hole for venting provided in the vulcanization mold A vent piece attaching method for attaching
Inserting the vent piece into the vent hole;
Of the vent piece inserted into the vent hole, the upper end convex portion of the tubular member protruding from the surface of the vulcanization mold is crushed or crushed,
A vent piece attachment method of grinding a part of an upper end convex portion of the cylindrical member crushed or crushed on the surface of the vulcanization mold.

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