KR101638955B1 - Multiple hole type vent-plug and menufacturing method thereof - Google Patents

Abstract

The present invention relates to a multi-cavity vent plug and a method of manufacturing the same, and more particularly, it relates to a multi-cavity vent plug and a method of manufacturing the same, in which a residual gas inside a tire vulcanizing mold is discharged through a plurality of fine vent holes formed in a micro- It is possible to prevent the rubber molding and to make it easier and simpler to fabricate a small and complicated structure having a plurality of micro vent holes through a three dimensional printing method to lower the manufacturing cost of the above- Thereby improving productivity and improving the appearance quality of the tire which may be deteriorated due to residual gas and rubber molding during the tire vulcanization process.

Description

TECHNICAL FIELD [0001] The present invention relates to a multi-hole type vent plug and a method of manufacturing the same,

The present invention relates to a multi-cavity vent plug and a method of manufacturing the same, and more particularly, to a multi-cavity vent plug capable of discharging residual gas without rubber molding through an exhaust hole of a vulcanization mold during tire vulcanization, .

As is well known, the purpose of the vulcanization process in the tire manufacturing process is to put green tires molded from flexible rubber semi-finished products into a vulcanization mold and to apply heat and pressure from inside and outside to allow sulfur and other chemicals to react with the rubber As a result of such a chemical reaction, the rubber molecules are combined with sulfur to form a stable compound to obtain elasticity, and a tread shape engraved in the vulcanized metal mold can be obtained.

The conditions of the steam, hot water, cooling water, high-pressure air, etc. necessary for the vulcanization operation must be adjusted in time in the vulcanization process of the tire described above, and residual gas such as air remaining in the vulcanization mold should be removed after vulcanization . Particularly, the residual gas remaining in the corner portion of the tread pattern shape must be discharged to obtain the shape of the complete tire.

If the residual gas is not discharged between the vulcanization mold and the vulcanized tire in the vulcanization process, pinholes may be formed in the tire or the marks due to the air flow may cause the structural union or defective appearance of the tire.

Therefore, an evacuation process is required to discharge the residual gas inside the vulcanizing mold to the outside of the vulcanizing mold through the exhaust holes formed to penetrate the vulcanizing mold.

However, in the process of exhausting the residual gas inside the vulcanizing mold through the exhaust holes, the rubber inside the vulcanizing mold is accompanied with the exhausting phenomenon.

In the case of the aforementioned rubber molding phenomenon, when the molded rubber is torn out in the demolding process of withdrawing the finished product tire from the vulcanized metal mold, the finished product tire can not be formed into a smooth surface and the aesthetic appearance is damaged. There is a need for an additional subsequent process for removing a large number of fur-like protruding rubbers on the outer circumferential surface of the tire, which is accompanied by an economical problem that the equipment must be provided.

Accordingly, in order to solve the above-described problems, there have been used techniques for installing a vent plug in the exhaust holes to prevent the rubber from escaping through the vulcanizing mold when the residual gas is discharged.

However, conventionally used vent plugs have a structure in which a movable shaft having an opening / closing head formed at one end thereof is inserted in a plug body having a discharge passage formed therein, and the other end of the movable shaft is fixed so as not to come out by hooking, So that the head can be maintained in a state of being supported by the elastic member inside the plug body to open and close the discharge passage inlet of the plug body.

Therefore, the residual gas inside the vulcanizing mold is discharged to the outside through the gap of the outlet passage of the plug body opened by the opening / closing head of the movable shaft, while the vulcanized rubber inside the vulcanizing mold expands, So as to block the above-described rubber molding.

However, since the conventional vent plug has a structure in which the engaging hole and the movable shaft constituting the vent plug are mutually assembled through screw fastening or the like, it is hard to process the assembling structure such as a screw thread into the small moving shaft and the fastening hole. The process is complicated and difficult, and the manufacturing cost is increased.

Further, in addition to the screw fastening structure, a structure in which the movable shaft and the stopper are integrally formed is proposed. However, most of the structure is also such that the diameter of the movable shaft is cut by cutting the surface of the movable shaft, There is a problem that the productivity is remarkably deteriorated due to a difficult processing process.

Korean Patent Registration No. 10-0957800 (Published on May 13, 2010) Korean Register of Shipping (2008) Japanese Patent Application Laid-Open No. 2002-283351 (published on October 03, 2002) Japanese Laid-Open Patent Publication No. 2011-189634 (date of disclosure September 29, 2011)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems described above and to provide a method and apparatus for removing residual gas from a vulcanizing mold during a tire vulcanizing process through a plurality of fine vent holes without a separate opening and closing means, The present invention also provides a method of manufacturing the same and a method of manufacturing the same, which enables a small and complicated structure having a plurality of fine vent holes to be easily and easily manufactured through a three dimensional printing method.

According to an aspect of the present invention, there is provided a vent plug of a cylindrical shape, which is inserted into an exhaust hole of a vulcanizing mold for vulcanizing a tire and has an exhaust hole formed therein, A single cylinder chamber in which a single vent hole is formed in the cylinder chamber; And a plurality of fine vent holes formed in the inner circumferential surface of the vulcanized metal mold to prevent rubber molding when the residual gas inside the vulcanized mold is discharged so as to communicate with the single cylinder. do.

Here, the single passage may be formed with an inclined stopping jaw so as to be seated and fixed when it is inserted into the exhaust hole of the vulcanized metal at the longitudinal center portion.

The single cylinder may include a first single cylinder having the same cross-sectional area as that of the micro exhaust cylinder and extending to communicate with the inclined stop, And a second single cylinder having a smaller cross sectional width than the first single cylinder cylinder and extending to communicate with the opposite side of the first exhaust cylinder bushing of the first single cylinder cylinder.

Here, the total length of the vent plug is within a range of 4 to 25 mm, and the maximum cross-sectional width is within a range of 3 mm, and the micro-exhaust pipe passage, the first single- Wherein the length of the second single passages is 1: 3: 5, the cross sectional width of the micro-exhaust passages and the first single passages is within 3 mm, Is preferably 2.8 mm or less.

The inclined exit portion may be formed at an end portion of the second passage so as to be inclined along the longitudinal direction and to gradually reduce the size of the internal exhaust ventilation hole. The width of the end portion of the inclined exit portion may be within a range of 2.6 mm.

In addition, the fine exhaust passages are inclinedly curved toward both side ends of the fine exhaust passages along the longitudinal direction at both longitudinal end portions of the fine exhaust passages, and the cross sectional area gradually increases, An exhaust through-hole outlet extension portion can be formed.

Here, it is preferable that the cross sectional width of the fine vent holes is within a range of 0.01 to 0.05 mm, and the interval between the fine vent holes is within a range of 0.16 mm to 0.32 mm.

The micro exhaust through-hole inlet extension and the micro exhaust through-hole outlet extension of each of the micro-exhaust vent holes are within a range of 0.01 to 0.16 mm, and the height of the micro exhaust through-hole inlet extension is within a range of 0.04 to 0.12 mm , And the height of the fine vent hole outlet extension portion is preferably within a range of 0.14 to 0.20 mm.

In addition, in the micro exhaust treatment chamber, the center portion where the micro exhaust holes are formed at the opposite side end portions of the single passage has a height difference from the edge portion, and the micro exhaust ventilation protection groove can be formed in a stepped manner.

In addition, it is preferable that the sectional width of the micro exhaust ventilation protection groove is within 2.52 mm and the depth is within 0.06 mm.

The method for manufacturing a multi-plug type vent plug for manufacturing the multi-plug type vent plug of the present invention includes: a three-dimensional data modeling step of modeling the shape of the multi-plug type plug into three-dimensional data; A multi-hole type vent plug printing step of printing and forming a multi-hole type vent plug on a support through a multi-layer laser sinter fusion process using a three-dimensional printer in accordance with the modeled three-dimensional data; A venting step of separating the vented plug from the printed support; And a polishing and cleaning step of a multi-hole type vent plug for polishing and cleaning the separated multi-hole type vent plugs.

In addition, the step of printing the porous plug may include printing a support on the bottom surface to form a laminate; A single barrel printing step of stacking and printing a single barrel of the vent plug on the printed support; And a fine exhaust pipe printing step of stacking and patterning the fine exhaust passages having the fine vent holes on the single passages.

Preferably, the supporting base is formed in a cylindrical shape corresponding to the outlet of the vent plug, and the supporting base is formed to have a downwardly inclined curved surface with a larger cross-sectional area as the outer circumferential surface gets closer to the bottom surface, To 0.5 mm, the maximum width of the bottom of the support is within 3 mm, and the maximum width of the top of the support is within 2.6 mm.

The tilt angle of the downwardly inclined curved surface of the support is preferably within a range of 55 to 70 degrees with respect to the bottom surface.

According to the present invention, it is possible to discharge the residual gas inside the tire vulcanizing mold through a plurality of fine vent holes formed in the fine vent hole without using any separate opening and closing means, It is possible to easily and easily manufacture a small and complex structure having a plurality of fine vent holes through a three dimensional printing method, thereby lowering the manufacturing cost of the above-mentioned porous vent plug And productivity, thereby improving the appearance quality of the tire, which may be deteriorated by residual gas and rubber molding, etc. during the tire vulcanization process.

FIG. 1 is a perspective view illustrating a porous plug according to an embodiment of the present invention. FIG.
2 is a longitudinal cross-sectional view of the porous plug of FIG. 1;
3 is a plan view of the multi-cavity vent plug of FIG.
Fig. 4 is a partially enlarged view showing the shape of a micro exhaust ventilation hole of the micro exhaust ventilation hole with respect to the porous vent plug of Fig. 2;
FIG. 5 is a flow chart showing a manufacturing process of the multi-hole type vent plug of FIG. 1;
6 is a schematic view showing the process of printing a support.
FIG. 7 is a schematic view showing a single-cylinder printing process of the multi-hole type vent plug.
Fig. 8 is a partially enlarged cross-sectional view showing an enlarged view of the printed support portion.
FIG. 9 is a schematic view showing a process of printing a micro exhaust pipe with respect to a multi-hole type vent plug. FIG.
10 is a schematic view showing a process of cutting the multi-hole type vent plug from a support.
11 is a schematic view showing a process of polishing and cleaning the porous plug of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

FIG. 1 is a perspective view illustrating a multi-hole type vent plug according to one embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the multi-hole type vent plug of FIG. 1.

1 and 2, the multi-hole type vent plug 1 of the present embodiment is inserted in the exhaust hole of the vulcanization mold for vulcanizing the tire, thereby discharging the residual gas inside the vulcanization mold during vulcanization of the tire when vulcanizing the tire A micro exhaust port 20 in which a plurality of micro exhaust holes 21 are formed through which rubber can be prevented from being formed, and a single pipe 10 are integrally printed and formed through a three-dimensional printing method .

First, in the single cylinder 10, the residual gas in the vulcanizing mold that has passed through the fine ventilation holes 21 of the fine exhausting cylinder 20 is inserted into the exhaust hole of the vulcanizing mold through the exhaust hole, And one single vent hole 16, 17 for exhausting the exhaust gas to the exhaust gas passage.

On the other hand, the single cylinder 10 is provided with a slant stop 15 at the center in the longitudinal direction. The slant stop 15 is inserted into the exhaust hole of the vulcanizing mold, The external air flows back to the inside of the vulcanizing mold through the fine gap formed between the vent hole of the multi-cavity vent plug (1) and the vulcanization mold so that it can be seated and fixed at the proper insertion position without being recessed more than necessary in the cavity It blocks the occurrence of inflows or rubber moldings and closes them.

Therefore, the single-cylinder bore 10 has a cross-sectional width or diameter difference with respect to the inclined jaw 15, and the first single bore hole 11 and the second single bore hole 12 are formed do

The first single cylinder cavity 11 has a first single inner cavity 16 communicating with the fine exhaust chamber 20 in the same cross-sectional area as the outer diameter D1, And the second single tubular portion 12 is formed to have a smaller sectional width, that is, an outer diameter D2, than the first single tubular portion 11, And a second single internal through-hole 17 communicating with the first single internal through-hole 16 on the opposite side of the exhaust gas bushing 20.

In addition, the fine exhaust port 20 communicates the residual gas inside the vulcanizing mold with the single inner holes 16, 17 of the single cylinder 10 from the inner peripheral surface of the vulcanization mold through the exhaust hole A plurality of micro exhaust holes 21 are formed to prevent the rubber from being exhausted together with the exhaust gas.

In order to prevent the rubber gasket from being discharged when the residual gas inside the vulcanizing mold is discharged, the multi-hole type vent plug 1 is integrally formed with the single ventilator 10 through the three- The fine exhausting passages 20, the first single passages 11 and the second single passages 12 are formed around the upper end of the fine exhaust passages 20 in the figure, (L1: L2: L3) of the length to the lower end portion of the lower surface of the substrate 1 is preferably 1: 3: 5.

The porous vent plug 1 has a length from the upper end of the micro exhaust vent 20 to the lower end of the second single cylinder 12 through the three- Is preferably within a range of 4 mm to 25 mm.

Here, when the total length L3 of the porous plug 1 is less than 4 mm, the self-rigidity of the porous plug 1 is lowered during manufacture by the three-dimensional printing method described later, And it is impossible to properly perform the function of preventing the residual gas from being discharged and preventing the molding of the rubber. If it is more than 25 mm, the implementation of the multi-hole type vent plug 1 through the three-dimensional printing method becomes impossible.

It is preferable that the length L2 from the upper end of the micro exhaust-exhaust port 20 to the lower end of the first single-passages 11 is within a range of 2 mm to 15 mm.

Here, when the length from the upper end of the micro exhaust ventilating lid 20 to the lower end of the first single passageway 11 is less than 2 mm, the self-rigidity of the porous vent plug 1 is deteriorated as described above The total length L3 of the above-mentioned porous plug 1 can be increased to increase the size of the porous plug 1 in the three-dimensional printing system. .

Therefore, the length L1 from the upper end of the micro exhaust ventilating ladle 20 to the lower end of the first single-tube ladle 11 is made to be the same as the length L1 after the tire is vulcanized in the vulcanization mold, It is more preferable to form it within a range of 2 mm to 5 mm in consideration of the separation process for separating from the vulcanizing mold.

The upper end of the fine exhaust gas flow channel 20 corresponding to the entire length of the fine exhaust gas flow channel 20 is connected to the lower end of the fine exhaust gas flow channel 20, And the length L1 to the end portion is preferably within a range of 0.8 to 5 mm.

Here, when the total length of the fine exhaust port 20 is less than 0.8 mm, the implementation of the fine exhaust port 20 through the three-dimensional printing method becomes impossible. If the total length is more than 5 mm, When the through holes are formed, clogging of the fine vent holes occurs.

 Therefore, it is more preferable that the optimum length of the entire length L1 of the fine exhaust port 20 is within a range of 1 mm to 2 mm.

The maximum cross-sectional area, i.e., the maximum outer diameter D1 of the porous plug 1 is set within a range of 3 mm so as to correspond to the inside diameter of the exhaust hole of the standardized vulcanization mold so as to be inserted in the exhaust hole of the vulcanization mold .

Therefore, in the present embodiment, it is illustrated that the total length of the porous plug 1 is 5 mm and the maximum outer diameter is 3 mm.

Accordingly, the porous plug 1 of the present embodiment has a length L1 of 1 mm from the upper end of the fine exhaust port 20 to the lower end of the fine exhaust port 20, The length L2 to the lower end of the first single cylinder 11 is 3 mm and the length L3 to the lower end of the second single cylinder 12 is 5 mm .

In other words, the cross-sectional width of the micro exhaust-exhaust passages 20 and the first single passages 11, that is, the outside diameter D1 is within 3 mm, the cross-sectional width of the second single passages 12 is 2.8 mm And the thickness of the sidewall surfaces of the first and second single cylinder bases 11 and 12 is 0.3 mm.

The inclined exit portion 18 is formed at the end of the second passage 12 so as to be inclined along the longitudinal direction and the inner exhaust vent 17 is gradually reduced in size. That is, the outer diameter D3 is 2.6 mm.

FIG. 3 is a plan view of the multi-hole vent plug of FIG. 1, and FIG. 4 is a partially enlarged view of the multi-hole vent plug of FIG.

3 and 4, the fine exhaust vent 20 is formed in the longitudinal direction at both longitudinal ends of the fine exhaust ventilation hole, and is inclined to the both side ends of the fine exhaust ventilator 20 along the longitudinal direction. The micro exhaust through-hole inlet expanding portion 22 and the micro exhaust through-hole outlet expanding portion 23 are formed so that the sectional area gradually increases.

The cross sectional width of the fine vent holes 21 is preferably within a range of 0.01 mm to 0.05 mm and the gap L7 between the fine vent holes 21 is preferably within a range of 0.16 mm to 0.32 mm Do.

If the cross-sectional width of the fine vent hole 21, that is, the inner diameter D4 is less than 0.01 mm, the fine particle vent hole may be clogged due to the average particle size of the powder material during manufacturing through the three-dimensional printing method of 0.008 mm , And if it exceeds 0.05 mm, rubber molding will occur when the residual gas is discharged.

The cross sectional widths, i.e., the inner diameters D5 and D6, of the fine exhaust through-hole inlet extension portion 22 and the fine exhaust through-hole outlet extension portion 23 of each of the fine exhaust through holes 21 are within a range of 0.01 to 0.16 mm . Therefore, in consideration of this, the distance between the micro exhaust apertures 21 is set within a range of 0.16 mm to 0.32 mm so that the maximum number of the micro exhaust apertures 21 can be formed so as to facilitate the discharge of the residual gas without being interfered with each other .

Preferably, the height L5 of the micro exhaust through-hole inlet extension portion 22 is within a range of 0.04 to 0.12 mm so that the curved surface inclination portion of one end surface of the micro exhaust through-hole inlet extension portion has a tangential inclination angle of about 45 to 70 degrees with respect to the horizontal plane Do.

If the height L5 of the micro exhaust through-hole inlet expanding portion 22 is less than 0.04, there is a trace of air escaping from the finished product tire after the air escapes in the tire vulcanization. If the height L2 is more than 0.12 mm, The exhausted portion of the micro exhaust through-hole inlet expanding portion 22 is torn and the external appearance of the tire is lowered.

 Therefore, in the present embodiment, it is exemplified that the height of the micro exhaust through-hole inlet extension portion is preferably 0.08 mm.

The height L6 of the micro exhaust through-hole outlet extension portion 23 is set such that the curved surface inclination portion of one end surface of the cross section of the micro exhaust through-hole outlet extension portion 23 has a tangential inclination angle of approximately 45to 70 mm to 0.20 mm.

Here, when the height L6 of the fine exhaust vent outlet 20 is less than 0.14 mm, the fine exhaust vent extended portion 23 is printed by the three-dimensional printing method to form a laminate, If the diameter is larger than 0.20 mm, the fine vent hole 21 may be clogged in the process of printing and stacking the fine vent holes 20.

In the meantime, the center of the micro exhaust port 20 is formed with the center portion where the micro exhaust holes 21 are formed on the upper end surface opposed to the single cylinder port 10, Grooves 25 are formed.

In this embodiment, it is preferable that the sectional width of the fine exhaust ventilation protection groove 25, that is, the center diameter D7 is within 2.52 mm and the depth L4 is within 0.06 mm.

In the process of inserting the multi-hole type vent plug 1 into the exhaust hole of the vulcanized mold by fittingly inserting the micro exhaust ventilation protection groove 25 on the upper surface of the micro exhaust port 20, Of the fine vent holes (21) are formed so as to be in contact with only the edge protrusions without contacting the bottom surface of the fine vent hole (25) in which the fine vent holes (21) are formed, (21) is prevented from clogging.

Therefore, the multi-hole type vent plug 1 of the present embodiment integrally forms the single exhaust passages 10 and the fine exhaust passages 20 in which a plurality of micro exhaust holes 21 are formed through the three-dimensional printing method, It is possible to discharge the residual gas inside the vulcanizing mold during the vulcanization process of the tire through the plurality of fine vent holes 21 without a separate opening and closing means and to prevent rubber molding, So that the outer shape can be improved.

Hereinafter, a process of manufacturing the above-described porous plug 1 through a three-dimensional printing method will be described in more detail with reference to FIGS. 5 to 11. FIG.

FIG. 5 is a flow chart showing a manufacturing process of the multi-hole type vent plug of FIG. 1;

Referring to FIG. 5, the process of fabricating the porous plug of the present embodiment through the three-dimensional printing method includes a three-dimensional data modeling step ST10, a multi-cavity vent plug printing step ST20, A vent plug separation step ST30 and a porous vent plug polishing and cleaning step ST40.

First, in the three-dimensional data modeling step ST10, according to the designed shape of the multi-plug type vent plug 1, the multi-plug type vent plug 1 is integrally formed through a multi- The shape is modeled as three-dimensional data.

 In the printing step ST20 of the multifunctional vent plug, multilevel vent plugs 1 are formed on the support by a multi-layer laser sinter fusion process using the three-dimensional printer 100 according to the modeled three-dimensional data of the multifunctional vent plug 1 ) Is printed and formed.

Here, the porous plug 1 is made of a powder material 110 such as chromium-cobalt (Co-Cr) alloy steel, stainless steel or maraging steel having an average particle size of 0.008 mm, 0.02 mm thick layers are laminated on the supporting base 30, the single cylinder 10 and the fine exhaust cylinder 20 are sequentially printed and formed by repeating the process of melting and sintering the necessary points of the laser using a laser spot having a diameter of 0.16 mm .

FIG. 6 is a schematic view showing the printing process of the support, FIG. 7 is a schematic view showing a single-cylinder printing process of the multi-hole vent plug, FIG. 8 is a partially enlarged cross- Fig. 3 is a schematic view showing a process of printing a fine exhaust pipe with respect to a multi-hole type vent plug. Fig.

6 to 9, the vent plug printing step ST20 includes a support printing step ST21, a single tube printing step ST22, and a fine exhaust tube printing step ST23.

 As shown in Figs. 6 and 8, in the support step printing step ST21, a support base 30 for supporting the above-mentioned porous type vent plug 1 on the bottom surface by printing and shaping is formed by printing It is a process of shaping.

The support base 30 has a cylindrical shape corresponding to an end of the inclined exit portion 18 of the bullet hole 10 of the multi-hole type vent plug 1. The outer peripheral surface of the support base 30 is widened from the upper side to the bottom side And the supporting stiffness is reinforced.

In the present embodiment, the height L8 of the support 30 is within a range of 0.3 mm to 0.5 mm, the maximum maximum cross-sectional width of the support 30, that is, the lower external diameter D8 is within 3 mm, The upper outer diameter D9 is 2.6 mm which is the same as the outer diameter D3 of the end portion of the inclined exit portion 18 of the second single cylinder 12.

When the height of the supporting table 30 is less than 3 mm, the multi-hole type vent plugs (ST30), which will be described later, 1) It is possible to break the printing formed part to break the bottom surface of the printing press or the lower end of the second single-padding 12 of the printed molded pneumatic vent plug 1 during the separation process, The height is too high, the printing processing time becomes unnecessarily long, and the sectional width of the inclined curved surface for reinforcement becomes large, so that the number of the perforated vent plugs per one through the three-dimensional printing machine is reduced.

Meanwhile, in this embodiment, the tilting angle of the downwardly inclined curved surface of the supporting frame in the supporting step printing step is set to be within the range of 55 ° to 75 ° with respect to the bottom surface, and the laser spot is sequentially laminated, A maximum diameter of 2.6 mm and a maximum diameter of the lower portion of 3 mm or less so that the support member can stably engage with the bottom surface and the vertically stacked vent plugs that are stacked and printed on the upper side are vertically stacked and supported .

In the single cylinder printing step ST22, as shown in Fig. 7, a single cylinder 10 of the above-mentioned bent plug 1 is formed by printing on the support base 30 which is formed by printing.

9, in the fine exhaust port printing step ST23, the fine exhaust port runner 20 having fine vent holes 21 on the single passageway is printed and shaped by printing .

10 is a schematic view showing a process of cutting the multi-hole type vent plug from a support.

Referring to FIG. 10, in the step of separating a multi-cavity vent plug (ST30), the print molding portion of the multi-hole type vent plug 1 which is formed by printing is cut off from the support base by using the cutting wire 120 Let's do it.

11 is a schematic view showing a process of polishing and cleaning the porous plug of the present invention.

Referring to FIG. 11, in the polishing and cleaning step ST40 of the porous-type vent plug, the separated porous type vent plug 1 is polished and cleaned, including an electromagnetically-driven (EMD) So as to have a predetermined surface roughness so as to complete the multi-hole type vent plug 1 of the finished product.

As described above, it is possible to easily and easily realize and manufacture the multi-hole type vent plug 1 having a small and complicated structure having a large number of fine vent holes 21 through the 3D printing method, It is possible to lower the manufacturing cost of the tire 1 and increase the productivity, and it is possible to improve the appearance quality of the tire which may be deteriorated due to residual gas and rubber molding, etc. during the tire vulcanization process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. And it goes without saying that they belong to the scope of the present invention.

1: Multi-hole type vent plug 10:
11: First Single Trough Study 12: Second Single Trough Study
15: slanting jaw 16: first single inner passage
17: second single inner hole 18: inclined exit portion
20: exhaust of fine exhaust 21: exhaust of fine exhaust
22: Micro exhaust ventilation inlet extension part 23: Micro exhaust ventilation outlet extension part
25: Micro exhaust ventilation protection groove 30: Support
100: Three-dimensional printing machine 110: Powder material
120: cutting wire 140: polishing and washing machine

Claims (15)

1. A vent plug of a cylindrical shape which is fitted in an exhaust hole of a vulcanization mold for a tire vulcanizing and in which an exhaust hole is formed,
A single cylinder in which one single vent hole is formed on the side of the inner insertion which is fitted in the exhaust hole; And
And a plurality of fine vent holes formed in the inner circumferential surface of the vulcanization mold so as to prevent rubber molding when the residual gas inside the vulcanization mold is discharged so as to communicate with the single cylinder,

Wherein the fine exhaust-
The center portion where the micro exhaust ventilation holes are formed at the opposite side end portions of the single passages has a height difference from that of the edge portion and the micro exhaust ventilation protection recesses are formed stepwise,
And the depth of the fine exhaust ventilation protection groove is within 0.06 mm.
The method of claim 1,
Wherein the single-
And an inclined stopping jaw is formed so as to be seated and fixed when it is inserted into the vent hole of the vulcanized metal at the center in the longitudinal direction.
3. The method of claim 2,
Wherein the single-
A first single cylinder extending around the inclined stopping jaw and having a same cross-sectional width as the micro exhausting cylinder and extending to communicate therewith; And
And a second single-cylinder vent having a smaller cross-sectional width than the first single-cylinder passageway and extending to communicate with the micro exhaust-ventilation-opposing side of the first single-passageway.
4. The method of claim 3,
The total length of the vent plug is within a range of 4 to 25 mm, the maximum cross-sectional width is within a range of 3 mm,

The length of the fine exhausting passageway, the first single passageway, and the other end of the second single passageway are set at a ratio of 1: 3: 5 around one end of the fine exhaust passageway,

Wherein a cross sectional width of the micro exhaust vent and the first single pass is within 3 mm and a cross sectional width of the second single pass is within 2.8 mm.
5. The method of claim 4,
An inclined outlet portion is formed at an end portion of the second single passage so as to be inclined along the longitudinal direction and to have a gradually reduced size of the internal exhaust vent,
Wherein a cross-sectional width of the shortest end of the inclined exit portion is within a range of 2.6 mm.
The method of claim 5,
Wherein the fine exhaust-
The micro exhaust through-hole inlet expanding portion and the micro exhaust through-hole outlet expanding portion are formed such that the cross-sectional area of the micro exhaust through-hole inlet expanding portion and the micro exhaust through-hole outlet expanding portion are gradually increased along the longitudinal direction at both longitudinal end portions of the micro exhaust through- Conical vent plug.
The method of claim 6,
The cross sectional width of the fine vent holes is formed within a range of 0.01 to 0.05 mm,
Wherein a distance between the micro exhaust holes is within a range of 0.16 mm to 0.32 mm.
8. The method of claim 7,
Sectional width of the micro exhaust through-hole inlet extension portion and the micro-exhaust ventilation-hole outlet extension portion of each of the fine exhaust through holes is within a range of 0.01 to 0.16 mm,
The height of the micro exhaust through-hole inlet expanding portion is within a range of 0.04 to 0.12 mm,
And the height of the micro exhaust vent port outlet extension is within a range of 0.14 to 0.20 mm.
delete 9. The method of claim 8,
Wherein the micro exhaust ventilation protection groove has a cross sectional width of 2.52 mm or less.
11. A method of manufacturing a multi-hole vent plug of claim 10,
A three-dimensional data modeling step of modeling the shape of the multi-plug vent plug as three-dimensional data;
A multi-hole type vent plug printing step of printing and forming a multi-hole type vent plug on a support through a multi-layer laser sinter fusion process using a three-dimensional printer in accordance with the modeled three-dimensional data;
A venting step of separating the vented plug from the printed support; And
And a polishing and cleaning step of a multi-cavity vent plug for polishing and cleaning the separated multi-cavity vent plugs,

Wherein the step of printing the multi-
A support base printing step of printing and stacking the support base on a bottom surface;
A single-cylinder printing step of forming a single cylinder of the vent plug on the printed support by lamination printing; And
And a micro exhaust-vent plug-and-print step of stacking and patterning the micro exhaust-exhaust passages having the micro exhaust through-holes on the single passages.
delete 12. The method of claim 11,
The support includes:
The vent plug having a tubular shape corresponding to an outlet of the vent plug,
Wherein the outer peripheral surface has a downwardly inclined curved surface with a larger cross-sectional area toward the bottom surface, and the supporting rigidity is reinforced.
The method of claim 13,
The height of the support is within the range of 0.3 to 0.5 mm,
Wherein the maximum width of the bottom of the support is less than 3 mm and the maximum width of the top is less than 2.6 mm.
The method of claim 13,
Wherein a tangential inclination angle of the downwardly inclined curved surface of the support is formed within a range of 55 to 75 degrees with respect to the bottom surface.

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