KR101901636B1 - Inside mold have for internal pitch division circumference direction of different gridiron pendulum of tire garyu apparatus and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to an inner mold having an internal pitch divided in a circumferential direction with different thermal expansion coefficients of a tire curing apparatus. An internal pitch for forming a pattern of a green tire curing mold is formed into a plurality of pieces of different materials having different thermal expansion coefficients in the circumferential direction of the green tire, and thermal expansion between the pieces is used to make adjacent bonding plates and fix the internal pitch and the inner mold and each internal pitch, and an air venting hole is formed between the pieces of the internal pitch to discharge air when the pattern is formed on the green tire. The present invention includes: an inner mold formed as a plurality of pieces in a curing apparatus for forming a pattern on the surface of a green tire, formed by combining a plurality of bonding plates having a rectangular shape with predetermined thicknesses, including a plurality of discharge grooves formed on a contact surface for air venting, and having outer and inner surfaces curved to be matched with the shape of the outer edge of the green tire; a combiner combining the bonding plates by penetrating the lateral side thereof; an internal pitch inserted into the inner surface of the inner mold, divided into a plurality of pieces in the longitudinal direction of the inner mold, combined and fixed with the inner mold by having different materials with different thermal expansion coefficients arranged alternately, and including a pattern member formed to form a pattern on the outer edge of the green tire; and a fixer combined with the outer and inner surfaces of the inner mold to combine and fix the internal pitch with the inner mold.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner mold having a circumferentially dividing inner pitch different in thermal expansion coefficient from a tire vulcanizing apparatus and a method for manufacturing the inner mold,

The present invention relates to an inner mold having a circumferentially dividing inner pitch in which the thermal expansion coefficient of a tire vulcanizing apparatus is different, and more particularly to an inner mold having a thermal expansion coefficient along a circumferential direction of a drawn green tire A plurality of pieces of different kinds of materials are used to form a pattern on a green tire by forming an air venting hole between each piece of the inner pitch so that the inner pitch and the inner mold are closely contacted with each other by using the thermal expansion between the pieces, To an inner mold having a circumferentially dividing inner pitch in which the thermal expansion coefficient of the tire vulcanizing apparatus is different from that of the tire vulcanizing apparatus in which air is discharged.

A sector mold used as one of the conventional molds for vulcanizing a tire has a structure in which a plurality of pieces formed with concavo-convexes corresponding to at least a profile surface of a tread portion of a product tire are attached to a rear block adjacent to each other And a plurality of sectors are connected to each other to constitute an annular sector mold.

At the time of tire vulcanization molding, air is gathered or gas is generated between the outer circumferential surface of the tire and the molding surface of the mold, and this air or gas forms a minute concave portion on the surface of the product tire, Lt; / RTI > For this reason, in the related art, a molding surface of a mold is provided with a through hole for exhausting air, which is referred to as a gas hole, and a recess for exhausting.

A rubber material flows into the gas outlet or exhaust groove during tire vulcanization molding to form a spew (also referred to as a burr as a protrusion of a rubber-like rubber) on the surface of the product tire. Therefore, there is a problem in that, after the molding, the finishing work for removing the spu is required, and after the removal of the spu, the appearance of the tire product is left or the noise of the tire is increased.

Therefore, in recent years, a sprue mold (slit vent) which does not have a gas exhaust hole or an exhaust groove on the mold surface is used for the purpose of reducing the generation of defective products in a tire excellent in appearance and at the time of vulcanization of a tire have.

Since the molds are separated in the vertical direction, the slit vents for air venting are formed in the vertical direction. Therefore, the slit vents have to be formed intentionally, and the number of the sprue molds formed is large, There is a problem that a pattern formation defective tire may be generated.

The prior art discloses a tire having a good appearance and a high dimensional accuracy by using a spewless mold (a mold having a minute gas outlet or an exhaust hole groove to the extent that the rubber material melted during tire vulcanization does not leak) , A mold for tire vulcanization molding capable of reducing the generation of defective articles during vulcanization molding, a method for producing the same, and an air injection tire formed by using a mold for tire vulcanization molding.

However, since the mold is separated in the conventional vertical direction and the slit vent for the air venting is formed in the vertical direction, the slit vent is required to be formed in detail, and the number of the sprue molds formed is large, There is a problem that a defective pattern formation defective tire may be generated.

Prior Patent: Korean Patent No. 10-0623401 (September 06, 2006)

The present invention relates to a method for forming a pattern of a green tire vulcanizing mold by forming a plurality of pieces of internal pitches different in thermal expansion coefficient from each other along a circumferential direction of a green tire, And an air venting hole is formed between each piece of the internal pitch so that air is discharged when a pattern is formed on the green tire. The internal mold having a circumferential division internal pitch different in thermal expansion coefficient from that of the tire vulcanizing apparatus The purpose is to provide.

According to an aspect of the present invention, there is provided an internal mold having a circumferentially dividing internal pitch different in thermal expansion coefficient from a tire vulcanizing apparatus according to an embodiment of the present invention, A plurality of air venting discharge grooves are formed on the contact surface, and the plurality of air venting discharge grooves are formed on the outer surface and the inner surface of the green tire so as to correspond to the outer peripheral shape of the green tire, An inner mold processed into this curve; A joining body for joining the plurality of joining plates constituting the inner mold through the side surfaces; A plurality of different kinds of materials having different thermal expansion coefficients are alternately arranged and fixed to the inner mold, and the inner surface of the inner mold is fixed to the inner surface of the inner mold, And an inner pitch at which the pattern member is formed to form a pattern on the outer periphery of the tire, and a fixing body which is inserted into the inner surface of the inner mold at an outer surface thereof to fix the inner pitch to the inner mold.

Specifically, the inner mold has a plurality of bonding plates formed in a curved shape along the longitudinal direction so that the bonding body is tightly coupled through the outer side in the vertical direction, the outer side is pressed through the external pressure device of the vulcanizing die, Is inserted into the heating device so as to be easily engaged with the inner pitch and is expanded by heating.

The inner pitch is divided into a plurality of pieces along the circumferential direction of the green tire. The inner pitch is coupled to the inner mold, heated through the heating device and tightly fixed by thermal expansion, And each piece is characterized in that two kinds of aluminum, iron, copper, tungsten, nickel or zinc having different thermal expansion coefficients are selected and used alternately.

The inner pitch is divided into a plurality of pieces along the circumferential direction of the green tire, and the inner pitch is coupled to the inner mold, heated through the heating device to be tightly fixed through thermal expansion, , Each piece is characterized in that at least two materials of aluminum, iron, copper, tungsten, nickel or zinc are formed of an alloy, and two alloys having different thermal expansion coefficients among the alloys are selected and used alternately.

The inner pitch is formed in an inner curved shape along the circumferential direction of the inner mold in the longitudinal direction, and is divided along the longitudinal grooves of the pattern. An air venting hole is formed on the contact surface between the inner pitch and the inner pitch, And air is discharged when the pattern is formed on the outer circumferential surface of the tire.

According to another aspect of the present invention, there is provided a method of manufacturing an inner mold having a circumferentially dividing inner pitch in which a thermal expansion coefficient of a tire vulcanizing apparatus is different from that of an air vent of the tire, Forming a coupling hole capable of coupling the tongue groove and the joining plate; Forming an inner mold by engaging a plurality of joining plates through a joining hole formed in the joining plate through a step of forming a joining hole capable of joining the air venting groove and the joining plate; Forming a curved inner surface of the inner mold with the joining plate coupled to the inner mold through a machining apparatus and forming a curved insertion groove on the inner surface of the inner mold through the step of forming the inner mold; A step of thermally expanding an inner mold through heating by injecting an inner mold coupled with a bonding plate into a heating device through the step of forming the insertion groove; Alternately arranging and joining each piece of dissimilar metal materials having different thermal expansion coefficients forming an internal pitch in the insertion groove of the thermally expanded internal mold through thermal expansion of the inner mold; A plurality of air venting holes are formed on the contact surfaces of the respective pieces by machining the internal pitches coupled to the insertion grooves of the internal mold through the machining device through the step of alternately arranging and combining the plurality of air venting holes, When the pattern is formed on the inner pitch through the step of forming the pattern member corresponding to the inner mold and the step of forming the pattern member on the inner surface, And heating the internal pitch through a heating device.

The inner pitch is divided into a plurality of pieces along the circumferential direction of the green tire. The inner pitch is coupled to the inner mold, heated through the heating device, and tightly fixed by thermal expansion. Wherein each piece formed of different materials is mutually interchanged and each piece is characterized in that two pieces of aluminum, iron, copper, tungsten, nickel or zinc having different coefficients of thermal expansion are selected and used alternately.

The inner pitch is divided into a plurality of pieces along the circumferential direction of the green tire. The inner pitch is coupled to the inner mold, heated through the heating device, and tightly fixed by thermal expansion. Wherein at least two materials of aluminum, iron, copper, tungsten, nickel or zinc are formed of an alloy and two alloys different in coefficient of thermal expansion of the alloy are selected, So that it can be used.

The present invention relates to a method for forming a pattern for forming a green tire vulcanizing mold by using different materials having different thermal expansion coefficients in a plurality of pieces along a circumferential direction of a green tire and by using thermal expansion, So that the inner pitch can be easily fixed and replaced.

In addition, since the air venting groove having a predetermined length is formed between the internal pitches, protruding protrusions are not formed on the outer circumferential surface of the green tire on which the pattern is formed, thereby reducing noise generation during driving.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the entire configuration of an inner mold having a circumferential division internal pitch different in thermal expansion coefficient of a tire vulcanizing apparatus according to an embodiment of the present invention; FIG.
Fig. 2 is a view showing the division of the heterogeneous inner pitch of the method of manufacturing the inner mold having the circumferentially divided inner pitches in which the thermal expansion coefficients of the tire vulcanizing apparatus according to the present invention are different.
Fig. 3 is a view showing an enlarged view of a coupled surface and a combined inner pitch of a method for manufacturing an inner mold having a circumferentially dividing inner pitch in which the thermal expansion coefficient of the tire vulcanizing apparatus dividedly formed along the tire circumferential direction according to the present invention is different to be.
4 is a view showing a process of a method of manufacturing an inner mold having a circumferentially divided inner pitch in which the thermal expansion coefficient of the tire vulcanizing apparatus according to the present invention is different.
Fig. 5 is a view showing a remaining process of a method of manufacturing an inner mold having a circumferential division internal pitch in which the thermal expansion coefficient of the tire vulcanizing apparatus according to the present invention is different.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments of the present invention are intended to illustrate an embodiment of the present invention, and the scope of the present invention is not limited to the illustrated embodiment, and the illustrated drawings are enlarged only for the key contents for clarity of design, And shall not interpret it.

Brief Description of the Drawings Fig. 1 is a view showing the entire construction of an inner mold having a circumferential division internal pitch different in thermal expansion coefficient of a tire vulcanizing apparatus according to an embodiment of the present invention, A plurality of joining plates 11 formed in a rectangular shape having a predetermined thickness are coupled to each other, a plurality of venting grooves for air venting are formed on the contact surfaces, An inner mold 10 in which the outer and inner surfaces are formed into curved lines so as to correspond to the inner mold 10 and the inner mold 10, And is divided into a plurality of pieces along the longitudinal direction of the inner mold 10, and the different kinds of materials having different thermal expansion coefficients are alternately arranged, and the inner mold 10 The inner pitch 20 is formed by forming the pattern member p so as to form a pattern on the outer periphery of the green tire and an inner pitch 20 which is inserted into the inner surface of the inner mold 10 from the outer surface of the inner mold 10 ) And the inner mold (10).

Referring to FIG. 1, the inner mold 10 has a predetermined thickness and is formed by joining a plurality of joining plates 11 formed in a rectangular shape, and an air venting groove c So that air can be discharged between the inner pitch 20 and the green tire when the green tire contacts the inner pitch 20 to form a pattern. When the contact surface of the bonding plate 11 is in contact, .

The air venting grooves c may be formed on both of the joining plates 11 on both sides and may be formed on only one of the two joining plates 11. [

When the air venting groove c is formed in the joining plate 11, the joining holes to which the plurality of joining plates 11 can be coupled are formed at the same positions so as to pass through the joining plates 11, (11) is aligned and the coupling body is coupled to the coupling hole, the coupling plates (11) are fixedly coupled to each other to form one inner mold (10).

The inner mold 10 penetrates the coupling holes through the coupling body so that the respective coupling plates 11 are not separated.

The combined body is made of a metal having a low thermal expansion coefficient, in order to prevent the bonding force from being weakened by preventing thermal expansion of the inner mold 10 when the inner mold 10 is expanded.

Such a combination may be any one of aluminum, iron, copper, tungsten, nickel, and zinc.

The joined body is made of a material different from the material of the inner mold 10 and having a coefficient of thermal expansion lower than that of the inner mold 10.

The inner mold 10, after the bonding is completed, processes the outer side surface and the inner side surface through the processing device.

At this time, the outer surface of the inner mold 10 is formed into a curved shape so that a uniform pressure is applied when the outer circumference of the green tire is pressed.

Further, an insertion groove 12 is formed in the inner side surface of the inner mold 10 in a curved shape through a processing device.

The reason why the insertion groove 12 is formed in a curved shape is that the inner pitch 20 is pressed by the pressure applied through the inner mold 10 so that when the pattern is formed on the outer surface of the green tire, So as to be constantly formed.

When the inner mold 10 is processed, the inner mold 10 is put into the heating device h to heat the inner mold 10 to a set temperature set in the heating device h.

The respective joint plates (11) of the inner mold (10) are made of a metal having the same expansion coefficient.

The material of the inner mold 10 may be any one of aluminum, iron, copper, tungsten, nickel, and zinc.

The expansion of the inner mold 10 through the thermal expansion allows the inner pitch 20 to be easily engaged when the inner pitch 20 is engaged with the insertion groove 12, So that the internal pitch 20 is fixed through heat shrinkage.

Fig. 2 is a view showing a divided inner joining pitch of a method of manufacturing an inner mold having a circumferential dividing inner pitch in which the thermal expansion coefficient of the tire vulcanizing apparatus according to the present invention is different. Fig. 3 is a cross- Sectional view of a tire vulcanizing apparatus according to a second embodiment of the present invention; FIG.

Referring to FIGS. 2 and 3, when the inner mold 10 is thermally expanded, an inner pitch 20 composed of a plurality of pieces is inserted into the insertion groove 12 and engaged.

At this time, the internal pitches 20 are arranged so as to alternate with each other and made of different kinds of metal materials having different thermal expansion coefficients, and two pieces of metal having different thermal expansion coefficients among aluminum, iron, copper, tungsten, And are inserted and fixed in the insertion groove 12.

When the inner pitch 20 is inserted and fixed in the insertion groove 12, a fixing body is inserted into the fixing hole formed through the outer side of the inner mold 10 so that the inner pitch 20 is fixed to the inner mold 10 .

The fixture is made of a metal having a low thermal expansion coefficient in order to prevent the inner force (10) and the internal pitch (20) from being inflated when the internal mold (10) and the internal pitch (20) expand.

Such a fixing body may use any one of aluminum, iron, copper, tungsten, nickel, and zinc.

The prismatic body is made of a material different from the material of the inner mold 10 and having a thermal expansion coefficient lower than that of the inner mold 10 and the inner pitch 20. [

The internal pitch 20 is formed such that the pieces formed of different materials are alternately interchanged, and each piece is selected from two materials having different thermal expansion coefficients among aluminum, iron, copper, tungsten, nickel, An array door is used.

Each piece of the internal pitch 20 may be used so that two or more materials of aluminum, iron, copper, tungsten, nickel, or zinc are formed of an alloy and two alloys having different coefficients of thermal expansion of the alloy are selected and mutually alternated have.

When the internal pitch 20 is coupled to the insertion groove 12 of the inner mold 10, the pattern member p is inserted into the processing apparatus to form a pattern member p on the inner surface of the internal pitch 20. [

The inner pitch 20 is formed in an inner curved shape along the circumferential direction of the inner mold 10 and is divided along the longitudinal grooves of the pattern so that the inner pitch 20 has a predetermined length An air venting hole 26 is formed to allow air to be discharged on the outer circumferential surface of the green tire when forming a pattern.

At this time, the air discharged through the air venting hole (26) is discharged to the outside through the air venting groove (c) of the inner mold (10).

Accordingly, it is not necessary to form a separate air venting hole in the inner pitch 20 and the inner mold 10.

Each piece material and the number of pieces of the internal pitch 20 will be described as follows.

When the internal pitch 20 is divided into five pieces, the numbers from 1 to 5 are assigned to each piece from the upper side to the lower side.

The internal pitches 20 1, 21 3 23 and 5 25 are made of the same material and the second pitch 22 and the fourth pitch 24 are made of the same material.

At this time, the upper and lower widths of the inner pitches 20, 21, 23, and 25 are larger than the inner pitches 20, 22 and 4, 24 , Each piece of internal pitch 20 is divided along the longitudinal pattern grooves of the engraved shape.

When the internal pitches 20, 21, 23, and 25 are made of aluminum having a high thermal expansion coefficient, the internal pitches 20 and 22 and 24 It is made of iron with a low coefficient of thermal expansion.

At this time, the inner pitches 20 and 22 are formed longer than the inner pitches 20, 21, 23, and 25 by a predetermined length.

This is because the internal pitches 20 and 22 of the lower thermal expansion coefficient 20 are less inflated than the internal pitches 20, 21, 23 and 25, (21), 3 (23), and 5 (25), which are thermally expanded.

The material of the internal pitch 20 may be formed by replacing the aluminum and iron materials, or may be made of a different metal having a different thermal expansion coefficient.

When the pattern member p is formed on the inner pitch 20 as described above, the inner pitch 20 is injected into the heating device h so that the inner pitch 20 and the inner mold 10 are tightly coupled through thermal expansion.

A method for manufacturing the above-described structure is as follows.

4 is a view showing a process of a method of manufacturing an inner mold having a circumferentially dividing inner pitch in which the thermal expansion coefficient of the tire vulcanizing apparatus according to the present invention is different, FIG. 5 is a view showing a tire vulcanizing apparatus according to the present invention, Sectional view showing a remaining process of a method of manufacturing an inner mold having a direction dividing inner pitch.

4 and 5, a step S10 of forming a coupling hole capable of coupling an air venting groove c, which is an air outlet, and a joining plate 11 to the contact surfaces of a plurality of joining plates 11, Through the coupling holes formed in the bonding plate 11 through the step S10 of forming the coupling holes capable of coupling the air venting groove c and the bonding plate 11 to form a plurality of bonding plates 11 (S20) of forming the inner mold 10 by combining the inner mold 10 and the inner mold 10, and forming the inner mold 10 with the outer surface of the inner mold 10, A step S30 of forming a curved insertion groove 12 on the inner side and a step S30 of forming the insertion groove 12 to form the inner side of the joined plate 11, (S40) of thermally expanding the inner mold (10) by heating the mold (10) into the heating device (h) and thermally expanding the inner mold (10) A step S50 of alternately arranging and joining the pieces of dissimilar metal materials having different thermal expansion coefficients forming the internal pitch 20 in the insertion groove 12 of the inner mold 10, The inner pitch 20 coupled to the insertion groove 12 of the inner mold 10 is processed through a machining apparatus to form a plurality of air venting holes 26 on the contact surfaces of the pieces, A step S60 of forming a pattern member p corresponding to the pattern to be formed on the outer periphery of the pattern member p on the inner side and a step S60 forming the pattern member p on the inner side face A step S70 of heating the inner mold 10 and the inner pitch 20 through the heating device h is carried out for close contact between each piece of the inner pitch 20 coupled to the inner mold 10, .

In the step S10 of forming the coupling hole, an air venting groove c is formed in a contact surface to be joined when a plurality of metal bonding plates 11, which are formed in a rectangular plate shape as an inner mold 10, And a joint hole is formed through the joint plates 11 so that the joint members 11 penetrate through the joint members.

When the coupling hole is formed in the joining plate 11 through the step of forming the coupling hole 10, the coupling plate formed on the joining plate 11 is passed through the step S20 of forming the inner mold 10 The plurality of bonding plates 11 are joined together through the bonding body to form one inner mold 10.

When the inner mold 10 is formed through the step S20 of forming the inner mold 10, the outer and inner surfaces of the inner mold 10 are formed through the step S30 of forming the insertion groove 12 Processing machine.

The inner surface of the inner mold 10 is processed into a curved shape when the inner mold 10 is processed through a processing apparatus and the inner surface of the inner mold 10 is formed into a curved shape.

The inner mold 10 to which the bonding plate 11 is coupled is thermally expanded in step S40 through the step of forming the inserting groove 12 into the heating device h And thermally expands the inner mold 10 through heating.

This thermally expands the inner mold 10 so that the inner pitch 20 coupled to the insertion groove 12 can be easily engaged.

When the inner mold 10 is thermally expanded through the thermal expansion step S40 of the inner mold 10, the inner mold 10 is thermally expanded through the step S50 of alternately arranging and bonding the inner mold 10 to the insertion groove 12 of the thermally expanded inner mold 10 Each piece of the dissimilar metal material having different thermal expansion coefficients forming the internal pitch 20 is alternately arranged and bonded.

The internal pitch 20 is divided into a plurality of pieces along the circumferential direction of the green tire in the step of arranging and combining the alternately arranged parts. The internal pitch 20 is connected to the inner mold 10 and heated by the heating device h, And the pieces formed of different materials are mutually interchanged.

Each piece of the internal pitch 20 is used so that the two kinds of aluminum, iron, copper, tungsten, nickel, or zinc having different coefficients of thermal expansion are alternately selected.

Each piece of the internal pitch 20 may be formed of two or more materials selected from the group consisting of aluminum, iron, copper, tungsten, nickel, and zinc, an alloy having two different thermal expansion coefficients, It is possible.

When the inner pitch 20 is disposed and coupled to the inner side of the inner mold 10, the module with the inner mold 10 and the inner pitch 20 engaged with each other is inserted into the heating device, So as to be fixed to the mold 10 in close contact with each other.

When the inner pitch 20 is coupled through the step S50 of alternately arranging and combining the inner pitches, the inner pitches (p) coupled to the inner mold 10 through the step (S60) 20 are processed through a processing apparatus to form a pattern member p.

The pattern member p of the internal pitch 20 is formed so as to correspond to a pattern to be formed on the outer periphery of the green tire.

When a pattern is formed on the inner pitch 20 through the step S60 of forming the pattern member p on the inner side, the inner part of the inner mold 20 is heated by the heating device h, The internal pitch 20 is heated through the heating device h for the close contact between the individual pieces of the pitch 20. [

According to the present invention, the internal pitch for pattern formation of the green tire vulcanization mold is formed into a plurality of pieces along the circumferential direction of the green tire by using different kinds of materials having different thermal expansion coefficients, The inner pitch can be tightly fixed and fixed, so that the inner pitch can be easily fixed and replaced.

In addition, since the air venting groove having a predetermined length is formed between the internal pitches, protruding protrusions are not formed on the outer circumferential surface of the green tire on which the pattern is formed, thereby reducing noise generation during driving.

The inner mold having the circumferentially divided inner pitches in which the thermal expansion coefficients of the tire vulcanizing apparatus are different from each other is not limited to the configuration and the manner of operation of the embodiments described above. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

10: inner mold 11: joint plate
12: Insertion groove c: Air venting groove
20: internal pitch 21: 1
22: 2, 23: 3
24: 4, 25: 5
26: air vent hole p: pattern member
h: Heating device

Claims (8)

A plurality of joining plates (11) formed in a rectangular shape having a predetermined thickness are formed in a plurality of pieces in a vulcanizing device for forming a pattern on the surface of a green tire, and a plurality of air venting An inner mold (10) in which a discharge groove is formed and outer and inner surfaces are curved so as to correspond to the outer peripheral shape of the green tire;
A joining body for joining the plurality of joining plates (11) forming the inner mold (10) through the side surfaces;
The inner mold 10 is inserted and fixed to the inner surface of the inner mold 10 and is divided into a plurality of pieces along the longitudinal direction of the inner mold 10 and different materials having different thermal expansion coefficients are alternately arranged, And an inner pitch 20 on which the pattern member p is formed so that the inner surface forms a pattern on the outer periphery of the green tire,
And a fixing body penetratingly coupled from the outer side to the inner side of the inner mold (10) to fix the inner pitch (20) and the inner mold (10) to each other, and the thermal expansion coefficient of the tire vulcanizer Internal mold with internal pitch.
The method according to claim 1,
The inner mold 10 has a plurality of bonding plates 11 formed in a curved shape along the longitudinal direction so that the bonding body is tightly coupled through the outer side in the vertical direction and the outer side is pressed through the external pressure device of the vulcanizing mold, An insertion groove 12 into which the internal pitch 20 is inserted is formed in a curved shape along the longitudinal direction and is inserted into the heating device h so that the internal pitch 20 can be easily engaged, An inner mold having a circumferentially dividing inner pitch that is different in thermal expansion coefficient of the tire vulcanizer.
The method according to claim 1,
The inner pitch 20 is divided into a plurality of pieces along the circumferential direction of the green tire. The inner pitch 20 is joined to the inner mold 10 and heated by the heating device h to be tightly fixed through thermal expansion. Wherein each piece to be formed is mutually interchanged and each piece is selected such that two different thermal expansion coefficients among aluminum, iron, copper, tungsten, nickel or zinc are alternately selected and used. An inner mold having a circumferential split inner pitch with different coefficients.
The method according to claim 1,
The inner pitch 20 is divided into a plurality of pieces along the circumferential direction of the green tire. The inner pitch 20 is joined to the inner mold 10 and heated by the heating device h to be tightly fixed through thermal expansion. Wherein at least two materials of aluminum, iron, copper, tungsten, nickel or zinc are formed of an alloy and two alloys different in coefficient of thermal expansion of the alloy are selected, Wherein the tire vulcanizing apparatus has a circumferential division internal pitch different from that of the tire vulcanizing apparatus.
The method according to claim 1,
The inner pitch 20 is formed in an inner curved shape along the circumferential direction in the longitudinal direction of the inner mold 10 and is divided along the longitudinal grooves of the pattern. Wherein an air venting hole (26) is formed in a circumferential direction of the green tire, and air is discharged when a pattern is formed on an outer circumferential surface of the green tire, the inner circumferential dividing inner pitch having a different thermal expansion coefficient.
A method of manufacturing an inner mold having a circumferential division inner pitch in which the thermal expansion coefficient of the tire vulcanizing apparatus according to claim 1 or 5 is different,
(S10) forming an engaging hole capable of engaging an air venting groove (c) as an air outlet and a joining plate (11) on a contact surface of a plurality of joining plates (11);
Through the coupling hole formed in the joint plate 11 through the step of forming a joint hole capable of coupling the air venting groove c and the joint plate 11 to form a plurality of joint plates 11) to form an inner mold 10 (S20);
The outer surface of the inner mold 10 to which the bonding plate 11 is coupled is processed into a curved shape through the processing device through the step S20 of forming the inner mold 10, (S30);
A step of thermally expanding the inner mold 10 by heating the inner mold 10 to which the bonding plate 11 is coupled through the step of forming the insertion groove 12 into the heating device h S40);
Each piece of the dissimilar metal material having different thermal expansion coefficients forming the internal pitch 20 in the insertion groove 12 of the thermally expanded inner mold 10 through the thermal expansion step S40 of the inner mold 10 may be alternately Arranging and combining (S50);
The inner pitch 20 coupled to the insertion groove 12 of the inner mold 10 is processed through a processing device through a step S50 of alternately arranging and combining the plurality of air venting holes 26), forming a pattern member (p) corresponding to a pattern to be formed on the outer periphery of the green tire on the inner surface (S60), and
When a pattern is formed on the inner pitch 20 through the step S60 of forming the pattern member p on the inner side surface of the inner mold 20 to closely contact each piece of the inner pitch 20 joined to the inner mold 10 (S70) of heating the inner mold (10) and the inner pitch (20) through a heating device (h), characterized in that the thermal expansion coefficient of the inner mold Gt;
The method according to claim 6,
The inner pitch 20 is divided into a plurality of pieces along the circumferential direction of the green tire in a step S50 of alternately arranging and combining the inner pitch 20 and the inner pitch 20. The inner pitch 20 is connected to the inner mold 10, Two pieces of aluminum, iron, copper, tungsten, nickel or zinc having different coefficients of thermal expansion are selected to be alternately arranged, Wherein the tire vulcanizing apparatus has a circumferential dividing inner pitch that is different from that of the tire vulcanizing apparatus.
The method according to claim 6,
The inner pitch 20 is divided into a plurality of pieces along the circumferential direction of the green tire in a step S50 of alternately arranging and combining the inner pitch 20 and the inner pitch 20. The inner pitch 20 is connected to the inner mold 10, Wherein at least two materials of aluminum, iron, copper, tungsten, nickel, or zinc are formed of an alloy, and each of the pieces is made of an alloy, Wherein the two kinds of alloys having different thermal expansion coefficients are selected and used so as to be alternated with each other, wherein the tire vulcanizing apparatus has circumferential division internal pitches different in thermal expansion coefficient.

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