JP6253517B2 - Tire vulcanization mold and method for manufacturing tire vulcanization mold - Google Patents

Description

  The present invention relates to a tire vulcanization mold, and more particularly, to a tire vulcanization mold capable of imparting an appropriate amount of heat depending on a portion of a tire, and a method for manufacturing the mold.

  Conventionally, a tire vulcanizing apparatus for vulcanizing an unvulcanized tire (green tire) includes a side mold that surrounds both side portions of the unvulcanized tire, and a plurality of crown molds that surround the crown portion of the unvulcanized tire, By transferring heat supplied from the outside through these molds, vulcanization of the unvulcanized tire proceeds. Further, since the amount of heat applied from the mold to the unvulcanized tire depends on the heat transferability of the metal constituting the mold, the amount of heat applied to the unvulcanized tire is substantially uniform regardless of the location. ing.

  FIG. 11A shows temporal changes in the degree of vulcanization in the vicinity of the center of the crown of the tire and the vicinity of the shoulder of the tire vulcanized by a mold that applies a uniform amount of heat regardless of the portion of the unvulcanized tire. It is a graph to show. As shown in the figure, the degree of vulcanization near the center where the gauge is thin rises faster than the area near the shoulder where the gauge is thick, mainly due to the difference in the gauge thickness of the rubber. . And, when the vicinity of the thick gauge shoulder reaches the appropriate degree of vulcanization, the degree of vulcanization near the center is likely to be overvulcanized beyond the appropriate degree of vulcanization. It becomes difficult to obtain a proper vulcanization degree.

Japanese Patent No. 4382673

  This invention is made | formed in view of the said problem, Comprising: It aims at providing the tire vulcanization metal mold | die which can provide an appropriate calorie | heat amount according to the site | part of an unvulcanized tire.

As a configuration of a tire vulcanization mold for solving the above-described problem, a tire vulcanization mold for transferring heat to a tire and vulcanizing the tire, a hollow provided inside the tire vulcanization mold Part, a heat transfer auxiliary part provided in the hollow part, and a heat amount adjusting agent that is accommodated in the hollow part and changes heat transferability in the hollow part, wherein the heat amount adjusting agent is a material of the tire vulcanization mold Are made of different materials, and the heat transfer auxiliary part can be inserted into and removed from the hollow part .
According to this configuration, since the heat amount adjusting agent made of a material different from the material of the tire vulcanization mold is accommodated in the hollow portion, the heat transfer property in the hollow portion can be controlled, and an appropriate amount is determined according to the tire part. It becomes possible to give the amount of heat. Moreover, since heat is transmitted through the heat transfer auxiliary part, the heat transferability in the hollow part can be controlled. Further, the mechanical strength of the tire vulcanization mold can be improved.
Further, as another configuration, the hollow portion is provided inside radially outside the pattern molding surface in the tire vulcanization mold.
According to this configuration, for example, the position of the hollow portion is closer to the position of the heat source that applies heat to the tire vulcanization mold as compared with the case where the hollow portion is provided in the convex portion provided on the pattern molding surface. The heat transfer can be controlled efficiently. Moreover, compared with the case where a hollow part is provided in a convex part, the intensity | strength of the convex part which touches an unvulcanized tire directly can be ensured. Moreover, it is good also as a structure which provided multiple hollow parts independently. The state in which the plurality of hollow portions are independent refers to a state in which the plurality of hollow portions are not in communication with each other.
By setting it as such a structure, a heat transfer auxiliary | assistant part can be increased / decreased freely and the heat transferability in a hollow part can be controlled efficiently. The volume of the heat transfer auxiliary part is preferably in the range of 5% to 50% with respect to the volume of the hollow part.
Moreover, as another structure, it was set as the structure which provided the calorie | heat amount adjusting agent supply / exhaust path connected to a hollow part and the exterior.
According to this configuration, heat amount adjusting agents made of different materials can be freely supplied and discharged through the heat amount adjusting agent supply / discharge path communicating with the hollow portion and the outside, and the heat transferability in the hollow portion can be controlled. . Moreover, the calorie | heat amount adjusting agent accommodated in the hollow part can be discharged | emitted outside, and reuse of a calorie | heat amount adjusting agent is attained.
Also, in another embodiment, the metal layer melted granular material of metal based on a plurality of slice data Slice master data of the tire vulcanizing mold, combined, correspond to the shape represented by each slice data Is a tire vulcanization mold manufacturing method for forming a tire vulcanization mold corresponding to the shape represented by the master data by laminating a plurality of slice data, wherein a part of the plurality of slice data is provided inside the mold Including a region corresponding to the shape of a part of the hollow portion to be stopped, melting and bonding of the granular material in the region are stopped, and the same or different granular material as the granular material is left in the region. .
According to this aspect, a part of the plurality of slice data includes a region corresponding to the shape of a part of the hollow portion provided inside the tire vulcanization mold, and the powder is melted and combined in the region. Is stopped, and the same or different granular material as the granular material is left in the region, so that a tire vulcanization mold in which the granular material is accommodated in the hollow portion can be obtained.
Moreover, it was set as the aspect provided with the production | generation process which melt | dissolves and solidifies the remaining granular material in a hollow part as another aspect.
According to this aspect, the product obtained by melting and solidifying the powder can be accommodated in the hollow portion.
The summary of the invention does not enumerate all necessary features of the present invention, and individual configurations constituting the feature group can also be the invention.

It is a schematic sectional drawing which shows a vulcanizer. It is a whole perspective view which shows a sector mold. It is sectional drawing (AA cross section of FIG. 2) of the width direction of a sector mold. It is width direction sectional drawing of the sector mold which concerns on other embodiment (Embodiment 2). It is width direction sectional drawing of the sector mold which concerns on other embodiment (Embodiment 3). It is sectional drawing of the width direction of the sector mold which concerns on the modification of Embodiment 3. It is width direction sectional drawing of the sector mold which concerns on other embodiment (Embodiment 4). It is width direction sectional drawing of the sector mold which concerns on other embodiment (Embodiment 5). It is width direction sectional drawing of the sector mold which concerns on other embodiment (Embodiment 6). It is the schematic which shows an example of an additive manufacturing apparatus. It is a graph which shows the time change of a vulcanization degree.

  Hereinafter, the present invention will be described in detail through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included in the invention. It is not always essential to the solution.

[Embodiment 1]
FIG. 1 is a schematic cross-sectional view of a vulcanizer 1. As shown in FIG. 1, the vulcanizer 1 molds one side portion S1 of an unvulcanized tire (hereinafter simply referred to as a tire) T that has been put in a horizontally placed state in which the rotation center axis extends in the vertical direction. A side mold 2 to be vulcanized and a side mold 3 facing the lower side mold 2 and molding and vulcanizing the other side portion S2 of the tire T are provided. The vulcanizing apparatus 1 includes a plurality of sector molds 4 that are annularly arranged along the crown portion C1 of the tire T between the side molds 2; 3, and that mold and vulcanize the crown portion C1.

  The tire T is an unvulcanized tire molded on a tire molding drum (not shown), for example. In the vulcanizing apparatus 1, the tire T is a pair of bead portions Tb that are spaced apart in the vertical direction; an unillustrated carcass extending across the Tb; and a carcass at the crown portion C1 on the carcass A plurality of belts and tread rubber to be laminated, and side members S1; S2 are configured to include members such as side rubbers disposed on the carcass.

  The side mold 2 is a disk-shaped mold having an open center. In the state where the tire T is placed, the side mold 2 comes into contact with the surface of the side portion S1 in which the molding surface 2a extends in the direction of the crown portion C1 from the vicinity of one bead portion Tb; Tb, and the side portion S1 Type the surface of the. Moreover, the side mold 2 is arrange | positioned on the base 5 which has the heating chamber 5a. The heating chamber 5 a is an annular channel formed in the base 5 so as to face the outer peripheral surface of the side mold 2. As will be described in detail later, a heating medium is supplied into the heating chamber 5a from a heat source supply device (not shown), and heat generated by the heating medium is transmitted to the side part S1 side through the side mold 2. The opening of the side mold 2 is closed by a bead ring 8a that molds the periphery of one bead part TB; TB, and a clamp ring 12a that grips a bladder 10 described later.

  As with the side mold 2, the side mold 3 is a disk-shaped mold having an opening at the center. In the state where the tire T is placed, the side mold 3 comes into contact with the surface of the side portion S2 in which the molding surface 3A extends in the direction of the crown portion C1 from the vicinity of the other bead portion Tb; Tb, and the side portion S2 Type the surface of the. The side mold 3 is disposed on the lower surface of the outer ring 7 that can be raised and lowered by the raising and lowering operation of the center post 6. A heating chamber 7 a is formed inside the outer ring 7. The heating chamber 7 a is an annular flow path formed in the outer ring 7 so as to face the outer peripheral surface of the side mold 3. In the heating chamber 7a, a heating medium is supplied from a heat source supply device (not shown) similarly to the heating chamber 5a, and the heat generated by the heating medium is transmitted to the side portion S2 side through the side mold 3. Moreover, the opening part of the side mold 3 is closed by a bead ring 8b that molds the periphery of the other bead part TB; TB and a clamp ring 12b that holds a bladder 10 described later.

  The plurality of sector molds 4 surround the crown portion C1 of the tire T in a ring shape in a state where they are combined in the circumferential direction. The sector mold 4 is divided into, for example, eight along the circumferential direction of the tire T. The pattern molding surface 4a that comes into contact with the surface of the crown portion C1 includes irregularities that mold a predetermined tread pattern on the surface of the crown portion C1. When the pattern molding surface 4a comes into contact with the surface of the crown portion C1, a tread pattern in which the unevenness formed on the pattern molding surface 4a is inverted is molded on the crown portion C1.

The plurality of sector molds 4 are held by a plurality of segments 9 that are mounted so as to be radially expanded or contracted in a radial direction along a slider mechanism disposed on a base 5. The outer peripheral surface 9 a of the segment 9 is formed as an inclined surface having the same gradient as the inner peripheral surface 11 b of the arm portion 11 of the outer ring 7. At the start of the vulcanization process, the outer peripheral surface 9a of the segment 9 and the inner peripheral surface 11b of the arm portion 11 are slidably contacted along the gradient by the lowering of the center post 6, and the plurality of segments 9 are reduced in diameter in the radial direction. . When the center post 6 is lowered to the lower limit position, the plurality of sector molds 4 are in a state of surrounding the crown portion C1 of the tire T without a gap. An annular heating chamber 11 a is formed in the arm portion 11 of the outer ring 7 so as to face the outer peripheral surface 9 a of the segment 9. In the heating chamber 11a, a heating medium is supplied from a heat source supply device (not shown) in the same manner as the other heating chambers 5a and 7a, and the heat generated by the heating medium is supplied to the crown C1 side via the segment 9 and the sector mold 4. Is transmitted to.
When the vulcanization process is completed and the tire T is demolded, the restraint of the segments 9 by the arm portions 11 of the outer ring 7 is released by raising the center post 6, and the diameter of each segment 9 is increased radially outward.

  A bladder 10 is disposed on the inner peripheral surface side of the tire T surrounded by the side molds 2; 3 and the plurality of sector molds 4. The bladder 10 is a stretchable body that expands with a fluid supplied from the outside of the vulcanizer 1. Due to the expansion of the bladder 10, the outer peripheral surface of the bladder 10 comes into close contact with the inner peripheral surface of the tire T and presses the outer peripheral surface of the tire T against the side molds 2; 3 and the plurality of sector molds 4.

  As described above, the tire T in the vulcanizer 1 is placed in a state of being pressurized by the side molds 2; 3, the plurality of sector molds 4, and the bladder 10. Further, the tire T is heated by the heating medium supplied into the plurality of heating chambers 5a; 7a; 11a, and vulcanization proceeds gradually.

  A heating medium such as steam or high-temperature inert gas is supplied to the plurality of heating chambers 5a; 7a; 11a from a heat source supply device (not shown) via a supply pipe (not shown). The heat source supply device includes a control unit that adjusts the temperature and flow rate of the heating medium supplied into the heating chambers 5a; 7a; 11a, and the control unit adjusts the temperature of the heating medium. By controlling the flow rate adjusting valve disposed in the pipe, the temperature and flow rate of the heating medium supplied into the plurality of heating chambers 5a; 7a; 11a are controlled.

  The side mold 2 arranged on the base 5 and the bead ring 8a are gradually heated by the heating medium supplied into the heating chamber 5a. The heat transmitted to the side mold 2 is mainly transmitted to the side portion S1 of the tire T that is in contact with the molding surface 2a of the side mold 2, and promotes vulcanization of the side portion S1. The heat transmitted to the bead ring 8a is mainly transmitted to one bead portion Tb; Tb of the tire T that contacts the bead ring 8a, and accelerates vulcanization of the bead portion Tb; Tb. The side mold 3 disposed on the lower surface of the outer ring 7 and the bead ring 8b are gradually heated by the heating medium supplied into the heating chamber 7a. The heat transmitted to the side mold 3 is mainly transmitted to the side portion S2 of the tire T that is in contact with the molding surface 3a of the side mold 3, and promotes vulcanization of the side portion S2. Further, the heat transmitted to the bead ring 8b is mainly transmitted to the other bead portion Tb; Tb of the tire T in contact with the bead ring 8b, and accelerates vulcanization of the bead portion Tb; Tb.

  By the heating medium supplied into the heating chamber 11a, the segment 9 contacting the inner peripheral surface of the arm portion 11 of the outer ring 7 and the sector mold 4 held in contact with the inner peripheral surface of the segment 9 are gradually heated. Is done. The heat transmitted to the sector mold 4 is mainly transmitted to the crown portion C1 of the tire T that is in contact with the pattern molding surface 4a of the sector mold 4, and promotes vulcanization of the crown portion C1. In the sector mold 4 according to the present embodiment, the amount of heat applied to the center region CCe of the crown portion C1 and the shoulder region CSh1 in the crown portion C1 between the start of the vulcanization step and the end of the vulcanization step; A structure is provided in which a difference is provided between the amount of heat applied to CSh2 and an appropriate amount of heat can be applied to each of the center region CCe and the shoulder region CSh1; CSh2. Hereinafter, the structure of the sector mold 4 will be described in detail with reference to FIGS. The range of the center region CCe and the shoulder region CSh1; CSh2 varies depending on the profile shape of the crown portion C1 of the tire T, but the center region CCe is at least the center in the width direction of the crown portion C1 of the tire T. It is a region straddling (tire center TC), and shoulder region CSh1; CSh2 is a remaining region excluding the center region CCe.

  FIG. 2 is a schematic perspective view showing one sector mold 4 among the plurality of sector molds 4. FIG. 3 is a cross-sectional view (A-A cross section) in the width direction of the sector mold 4. In addition, the width direction, the circumferential direction, and the radial direction described below are directions based on the tire T disposed in the vulcanizer 1 shown in FIG.

  As shown in FIG. 2, the sector mold 4 has a pattern molding surface 4 a that contacts the outer peripheral surface of the crown portion C <b> 1 of the tire T, and an outer peripheral surface 4 b that contacts the inner peripheral surface 9 b of the segment 9. The pattern molding surface 4a and the outer circumferential surface 4b are curved with a predetermined curvature continuously along the circumferential direction so as to correspond to the curvature of the outer circumferential surface of the crown portion C1 of the tire T. The circumferential end surfaces 42a; 42b connecting the pattern molding surface 4a and the outer peripheral surface 4b are abutted against and contacted with the circumferential end surfaces 42b; 42a of the other adjacent sector molds 4, respectively. Moreover, the end faces 43a; 43b in the width direction connecting the pattern molding surface 4a and the outer peripheral surface 4b are the outer peripheries of the side mold 2; 3 via the step portions 21; 31 formed on the outer peripheral surface of the side mold 2: 3. It abuts against the surface.

On the pattern molding surface 4a, pattern molding convex portions such as a plurality of main groove molding convex portions 43 and a plurality of horizontal groove molding convex portions 44 are formed. The plurality of main groove molding convex portions 43 extend continuously along the circumferential direction of the pattern molding surface 4a, and are formed at equal intervals across the tire center TC. The plurality of lateral groove molding convex portions 44 are arranged, for example, at equal intervals along the circumferential direction of the pattern molding surface 4a, and extend in an arc shape from the main groove molding convex portion 43 side toward the end surfaces 43a and 43b, respectively. . On the outer peripheral surface of the crown portion C1 of the tire T that is pressed against the pattern molding surface 4a having the main groove molding convex portion 43 and the lateral groove molding convex portion 44, the above-mentioned pattern formed on the pattern molding surface 4a. A tread pattern including a ground plane and a groove having a shape obtained by inverting the shape of the convex portion is formed. The shape of the pattern forming surface 4a shown in the drawing is merely an example, and the outer peripheral surface of the crown portion C1 can be changed by changing each element such as the number, shape and dimensions of the main groove forming convex portions 43 and the lateral groove forming convex portions 44. It is possible to mold various tread patterns.
Although details will be described later, the sector mold 4 having the above-described configuration is made of, for example, a general metal casting method or a later-described additive manufacturing method using a metal such as iron, aluminum, stainless steel, or an alloy thereof. It is shaped by.

As shown in FIGS. 2 and 3, a hollow portion 50 having a predetermined shape is provided inside the sector mold 4. The hollow portion 50 is a cavity having a substantially rectangular cross section that extends continuously in the circumferential direction inside the sector mold 4, in other words, between the pattern molding surface 4a and the outer peripheral surface 4b. The width direction length L1 of the hollow part 50 is arbitrarily set according to, for example, the width direction shape of the pattern molding surface 4a. For example, in the sector mold 4 shown in the figure, the pattern molding surface 4a is a center molding region Rc that molds the center region CCe that is a part of the crown portion C1 of the tire T, and is also a part of the crown portion C1 of the tire T. The shoulder regions CSh1 and CSh2 are respectively formed into shoulder regions RSh1 and RSh2, and the buttress portion Rb1 and Rb2 that respectively shape the buttress portion of the tire T. And the width direction dimension L1 of the hollow part 50 is set to the dimension corresponding to the width direction dimension of the center shaping | molding area | region Rc. That is, in the sector mold 4 according to the present embodiment, the hollow portion 50 corresponding to the range of the center molding region Rc that molds the center region CCe that is a part of the crown portion C1 of the tire T is provided.
In addition, what is necessary is just to make the circumferential direction dimension of the hollow part 50 into a dimension shorter than the length between the end surfaces 42a; 42b of the circumferential direction. On the other hand, when a plurality of sector molds 4 are adjacently combined, the dimensions from the end faces 42a; 42b to both end portions in the circumferential direction of the hollow portion 50 from the viewpoint of minimizing the interval where the hollow portion 50 does not exist. It is desirable to set L2 (thickness) to about 1 mm to 10 mm, for example.

  Since the hollow portion 50 corresponding to the range of the center molding area Rc is provided in the sector mold 4, the heat transferred from the heating chamber 11 a to the outer peripheral surface 4 b side of the sector mold 4 is within the hollow portion 50 as indicated by an arrow. It is blocked (insulated) by the gas (air) and reaches the center part shaping region Rc so as to go around the hollow part 50. Therefore, the amount of heat applied to the center region CCe from the start of vulcanization until a predetermined time has elapsed is suppressed to be lower than the amount of heat applied to the shoulder region CSh1; RSh2; The Therefore, when the shoulder region CSh1; CSh2 reaches an appropriate degree of vulcanization due to the progress of vulcanization, the center region CCe having a thin gauge thickness can be prevented from being over-vulcanized, and the center region CCe and the shoulder region CSh1; Both CSh2 can be set to an appropriate degree of vulcanization.

  FIG. 11B shows a center region CCe and a shoulder region CSh1; CSh2 of the crown portion C1 of the tire vulcanized by the vulcanizing device 1 including the sector mold 4 having the hollow portion 50 according to the above-described embodiment. It is a graph which shows the time change of a vulcanization degree. As is clear from the comparison with FIG. 11A, according to the sector mold 4 according to the present embodiment, the amount of heat applied to the center region CCe formed with the gauge thickness thinner than the shoulder regions CSh1; Due to the suppression, the vulcanization degree of the center region CCe and the shoulder region CSh1; CSh2 after the elapse of a predetermined time (for example, after 30 minutes) from the start of vulcanization are both within the range of the appropriate vulcanization degree. I can confirm.

[Embodiment 2]
FIG. 4 is a cross-sectional view in the width direction of the sector mold 4 showing the sector mold 4 according to another embodiment. The sector mold 4 according to the present embodiment is different from the sector mold 4 according to the above-described embodiment in that a heat amount adjusting material 60 is accommodated in the hollow portion 50. In the above-described embodiment, the heat from the heating chamber 11a is insulated by the air in the hollow portion 50, thereby providing a difference in the amount of heat applied to the center region CCe and the shoulder region CSh1; CSh2. The difference in calorie needs to be set as appropriate according to the difference in gauge thickness between the center region CCe and the shoulder regions CSh1 and CSh2 in the tire T to be vulcanized. Therefore, in the sector mold 4 according to the present embodiment, the heat amount adjusting agent 60 is accommodated in the hollow portion 50, thereby controlling the heat transfer property in the hollow portion 50 so that the heat amount difference can be freely adjusted.

  Here, as the calorie | heat amount adjusting agent 60 accommodated in the hollow part 50, what is necessary is just a material different from the material which comprises the sector mold 4 at least, In addition to solids, such as a metal and a resin, liquids, such as water and oil, Alternatively, a mixture thereof may be used. In the case of containing a metal, for example, powders containing metal powder such as iron, aluminum, stainless steel, copper, silver, metal particles, metal chips, or a mixture thereof can be widely used. Moreover, when accommodating resin, the powder body which contains resin powder, such as rubber | gum, polyethylene, a polypropylene, ABS, a resin grain, a resin chip, or these mixtures is widely employable. In addition, as long as it can be accommodated in the hollow portion 50, the particle size of various powders and particles constituting the granular material, the area of the chip, the size of these volumes, and the surface shape such as the presence or absence of irregularities are not questioned. Absent. In addition, the accommodation method of the calorie | heat amount adjusting agent 60 is mentioned later.

  If it is set as the structure which accommodates the calorie | heat amount adjusting agent 60 which consists of a granular material as mentioned above in the hollow part 50, it is hollow by adjusting the magnitude | size, density, mixing ratio, etc. of the powder etc. which comprise a granular material. The thermal conductivity in the part 50 can be controlled, and the amount of heat applied to the center region CCe can be freely adjusted. Therefore, the difference in the amount of heat applied to the center region CCe and the shoulder regions CSh1; CSh2 can be freely adjusted. Moreover, although mentioned later for details, if it is set as the structure which accommodates a granular material in the hollow part 50, reuse of the calorie | heat amount adjusting agent 60 accommodated in the hollow part 50 will be attained.

[Embodiment 3]
FIG. 5 is a cross-sectional view in the width direction showing a sector mold 4 according to another embodiment. The sector mold 4 according to the present embodiment is different from the sector mold 4 according to the second embodiment in that a heat transfer auxiliary part 70 is formed in the hollow part 50 in which the heat quantity adjusting agent 60 is accommodated. As shown in the figure, the heat transfer auxiliary part 70 is configured by a plurality of columnar bodies 70 a extending between the radial inner side surface 51 and the radial outer side surface 52 that define the shape of the hollow part 50. The plurality of columnar bodies 70a are formed using the same metal as that constituting the sector mold 4 or another metal having a different thermal conductivity as a material. Further, the plurality of columnar bodies 70a are arranged at regular intervals along the width direction and the circumferential direction in the hollow portion 50, for example.

  If such a heat transfer auxiliary part 70 is provided, the heat easily passes through the heat transfer auxiliary part 70 in the hollow part 50 and reaches the center part shaping region Rc, so that the heat transfer auxiliary part occupying the volume of the hollow part 50 By appropriately setting the volume ratio of 70, the thermal conductivity in the hollow portion 50 can be controlled. Here, the volume of the heat transfer auxiliary part 70 is desirably set in the range of 5% to 50% of the volume of the hollow part 50. By setting it as such, the accommodation volume of the calorie | heat amount adjusting agent 60 can fully be ensured, and the influence on the change of the heat transferability in the hollow part 50 by accommodating the calorie | heat amount adjusting agent 60 can be ensured. That is, if the volume of the heat transfer auxiliary part 70 is increased too much, the tendency of the heat transferability of the hollow part 50 to be dependent on the volume of the heat transfer auxiliary part 70 becomes too strong. It becomes difficult to control the sex. Therefore, by setting the volume of the heat transfer auxiliary unit 70 within the above range, it is possible to leave sufficient room for controlling the heat transfer performance by adjusting the heat amount adjusting agent 60. In addition, it is good also as a structure which provided only the heat transfer auxiliary | assistant part 70 in the hollow part 50, without accommodating the calorie | heat amount adjusting agent 60. FIG. Further, by providing the heat transfer auxiliary part 70 in the hollow part 50, it is possible to improve the durability of the center mold attaching region Rc.

  In the above-described example, the heat transfer auxiliary portion 70 is configured by the plurality of columnar bodies 70a linearly extending between the radial inner side surface 51 and the radial outer side surface 52, but the specific structure is limited to this. For example, a plurality of columnar bodies 70a may be inclined to form a truss structure, or a honeycomb structure may be formed in the hollow portion 50 without using the columnar bodies 70a.

FIG. 6 is a cross-sectional view in the width direction showing the sector mold 4 according to a modification of the third embodiment. This embodiment is different from the above embodiment in that the heat transfer auxiliary portion 70 can be inserted into and removed from the hollow portion 50 from the outside. As shown in FIG. 6, each heat transfer auxiliary | assistant part 70 which concerns on this form is comprised from the volt | bolt 75 which can be screwed in from the outer peripheral surface 4b side. A screw portion 75 a formed at the tip of the bolt 75 is screwed into a screw hole 53 formed in the radially inner side surface 51 that defines the hollow portion 50, and the bolt 75 extends from the radially inner surface 51 to the radially outer surface. Extends linearly across 52. Thus, by making the heat transfer auxiliary part 70 insertable / removable from the outside and increasing / decreasing the number, the ratio of the heat transfer auxiliary part 70 in the hollow part 50 can be adjusted, and the heat transferability in the hollow part can be efficiently increased. Can be controlled. In the illustrated example, the bolt 75 is screwed from the outer peripheral surface 4b side. However, a predetermined screw hole is provided in the radially outer surface 52, and the bolt 75 is screwed from the pattern molding surface 4a side. Or it is good also as a structure screwed from both.

[Embodiment 4]
FIG. 7 is a cross-sectional view in the width direction of a sector mold 4 according to another embodiment. The sector mold 4 according to the present embodiment is provided with independent hollow portions 50A and 50B at positions corresponding to the shoulder mold forming regions RSh1 and RSh2 as compared with the sector molds 4 according to the plurality of embodiments described above. It differs in the point which accommodates the calorie | heat amount adjusting agent 60 which consists of a metal whose heat conductivity is higher than the metal which comprises the sector mold 4 in part 50A; 50B. The plurality of hollow portions 50A and the hollow portions 50B are individually provided without communicating with each other inside. With such a configuration, it becomes possible to improve the thermal conductivity of the hollow portions 50A; 50B corresponding to the shoulder embossing regions RSh1; RSh2 more than the thermal conductivity of the center portion embedding region Rc, and the gauge thickness is the center region. The amount of heat applied to the shoulder region CSh1; CSh2 formed thicker than CCe can be increased more than the amount of heat applied to the center region CCe. Therefore, when the vulcanization process is completed, the vulcanization degree of the center region CCe and the shoulder region CSh1; CSh2 can be set to an appropriate vulcanization degree.

[Embodiment 5]
FIG. 8 is a partially enlarged view of the sector mold 4 showing the sector mold 4 according to another embodiment. The sector mold 4 according to the present embodiment is different from the sector mold 4 according to the plurality of embodiments described above in that a heat amount adjusting agent supply / discharge path 55 communicating with the hollow portion 50 is formed. The heat amount adjusting agent supply / discharge path 55 is a pipe line that reaches from the outer peripheral surface 4 b of the sector mold 4 to the radially outer side surface 52 that defines the shape of the hollow portion 50. The number and position of the heat quantity adjusting agent supply / discharge paths 55 are not limited. For example, if a plurality of heat quantity adjusting agent supply / discharge paths 55 are formed along the width direction or the circumferential direction of the hollow portion 50, the operation of supplying and discharging the heat quantity adjusting agent 60 is performed. It can be speeded up.

  When the sector mold 4 is used (when the tire T is vulcanized), the heat amount adjusting agent supply / discharge path 55 is sealed by a sealing body 55a inserted or screwed in from the outer peripheral surface 4b side of the sector mold 4. The sealing body 55a is a pin body made of the same metal as the sector mold 4 and prevents the heat amount adjusting agent 60 accommodated in the hollow portion 50 from being discharged to the outside. On the other hand, after the sector mold 4 is used, the heat quantity adjusting agent supply / exhaust passage 55 is in communication with the hollow portion 50 and the outside by pulling out the sealing body 55 a from the outside, and the amount of heat stored in the hollow portion 50. It becomes possible to discharge and collect the adjusting agent 60 to the outside. As described above, by providing the hollow portion 50 formed inside the sector mold 4 and the heat amount adjusting agent supply / discharge path 55 communicating with the outside of the sector mold 4, the heat amount adjusting agent 60 can be freely supplied and discharged. Therefore, the heat transferability in the hollow portion 50 according to the gauge thickness of the tire T can be freely controlled. Moreover, since the calorie | heat amount adjusting agent 60 can be utilized most, resource saving and cost reduction can be achieved. In addition, about the sector mold 4 which concerns on Embodiment 4 which has several hollow part 50A; 50B, the effect similar to the above is formed by forming the several heat quantity adjusting agent supply / discharge path 55 corresponding to each hollow part 50A; 50B. Can be obtained.

[Embodiment 6]
FIG. 9 is a cross-sectional view in the width direction of the sector mold 4 including the hollow portions 50A and 50B described in the fourth embodiment and the heat amount adjusting agent supply / discharge passage 55 described in the fifth embodiment. In this example, in the hollow portions 50A and 50B, as a calorific value adjusting agent 60, for example, a product 60A in which aluminum particles are integrated is accommodated. In this example, the sector mold 4 is made of, for example, iron.

  In order to accommodate the product 60A in the hollow portion 50A; 50B, the aluminum powder particles are accommodated in the hollow portion 50A; 50B, and the heat amount adjusting agent supply / discharge path 55 is sealed with the sealing body 55a. Thereafter, the sector mold 4 is put into a heating furnace (not shown) and heated. When the temperature in the sector mold 4 reaches the melting point of aluminum, the granular material accommodated in the hollow portions 50A and 50B is melted and liquefied. Thereafter, the sector mold 4 is taken out from the heating furnace and cooled, and the liquefied aluminum is solidified in the hollow portions 50A and 50B. Thus, by melting and solidifying the aluminum particles in the hollow portion 50A; 50B, the aluminum product 60A in which the particles are integrated is accommodated in the hollow portion 50A; 50B. Can do. Further, in order to discharge the aluminum product 60A accommodated in the hollow portion 50A; 50B to the outside of the sector mold 4, the sector mold 4 is again put into the heating furnace to melt and liquefy the product 60A. . Thereafter, the liquefied aluminum is discharged through the heat amount adjusting agent supply / discharge passage 55. Thus, if it is set as the product 60A which melted and solidified the granular material, compared with the case where a granular material is accommodated, the heat transferability in hollow part 50A; 50B can be improved. In the above example, the aluminum particles are melted and solidified, but the product 60A composed of two or more types of particles is accommodated by melting and solidifying two or more types of particles. It is good also as composition to do. In the above example, the granular material is melted and solidified in the hollow portions 50A and 50B. However, the granular material is previously melted and liquefied externally, and the liquefied granular material is supplied with a calorie adjusting agent. You may inject | pour into hollow part 50A; 50B via the drainage path 55, and you may solidify in hollow part 50A; 50B. According to such an injection method, the product 60A having the same volume as that of the hollow portions 50A and 50B can be accommodated.

[Production method]
Next, the main manufacturing method of the sector mold 4 will be described by taking the sector mold 4 according to the second embodiment as an example. As described above, the sector mold 4 is manufactured using a general metal casting method or additive manufacturing method. Here, in particular, the additive manufacturing method corresponds to the shape represented in the converted slice data by converting the master data of the sector mold 4 including three-dimensional CAD data into a plurality of slice data (stack data). This is a technique for forming and manufacturing the shape of the sector mold 4 represented by master data by sequentially stacking layers to be processed.

  Moreover, in manufacturing the sector mold 4, as a suitable additive manufacturing method, generally, on the molding machine side that receives a plurality of slice data, while irradiating the metal powder while irradiating the metal powder, the metal powder is melted. Laser light is applied to the metal powder pre-laid in the chamber on the molding machine side that receives a plurality of slice data in a method that sequentially forms layers corresponding to the shape represented by each slice data while being combined Then, a method of forming a layer corresponding to the shape represented by each slice data by melting and bonding the metal powder can be adopted.

  FIG. 10 is a schematic diagram illustrating an example of the layered manufacturing apparatus 80. The additive manufacturing apparatus 80 receives slice data and is provided on a control device 82 that controls each mechanism based on the slice data and a table moving mechanism 83, and is movable in the X-axis, Y-axis, and Z-axis directions. A scanning table 85, a nozzle mechanism 87 for irradiating the laser light L while injecting metal powder in the direction of the substrate 85a laid on the scanning table 85, and a chamber 89 for constantly supplying the metal powder into the nozzle mechanism 87. And a laser output device 90 that outputs laser light L to the nozzle mechanism 87. In this example, it is assumed that iron powder as an example of metal powder is ejected from the nozzle mechanism 87.

  The scanning table 85 is disposed on the table moving mechanism 83. The table moving mechanism 83 includes an elevating part 83a that elevates and lowers the table 85 in the Z-axis direction (vertical direction), a slider mechanism 83b disposed on a support plate that elevates and moves in conjunction with the elevating operation of the elevating part 83a, A moving plate 84 that is slidable in the X-axis direction (left-right direction) by a slider 83b mechanism and a slider mechanism 84a disposed on the moving plate 84 are provided. The slider mechanism 84a supports the table 85 so as to be slidable in the Y-axis direction (front-rear direction) orthogonal to the X-axis direction. The elevating unit 83a and the slider mechanism 83b; 84a each include a drive source such as a motor that operates in accordance with a drive signal output from the control device 82, and these drive sources are repeatedly controlled according to slice data. The layers corresponding to the shapes represented by the slice data are sequentially laminated on the substrate 85a on the table 85. In this example, the stacking direction is set to the direction from the radially outer side to the inner side of the sector mold 4. Therefore, when a layer corresponding to one slice data is formed by repeated scanning of the scanning table 85 in the X and Y axis directions, the scanning table 85 descends in the Z axis direction, and the layer corresponding to the upper slice data. Is formed by repeated scanning of the scanning table 85 in the X and Y axis directions. In this example, the additive manufacturing apparatus 80 configured to move the scanning table 85 in the X-axis, Y-axis, and Z-axis directions with respect to the nozzle mechanism 87 is taken as an example. A configuration in which the mechanism 87 moves or a configuration in which both of them move simultaneously may be employed.

  The nozzle mechanism 87 is a cylindrical body extending in the Z-axis direction, and has an irradiation port 87a for irradiating the laser beam L on the substrate 85a side. Laser light L emitted from the irradiation port 87 a is generated by a laser output unit 90 provided in the control device 82. The control device 82 controls the laser output unit 90 based on each slice data, and controls whether or not the laser light L is output from the laser output unit 90, the output timing, the output time, and the like. The optical path of the laser beam L output from the laser output unit 90 is changed by the optical path adjustment mirror 91. The laser beam L reflected by the optical path adjusting mirror 91 is irradiated to the substrate 85a side through the approximate center of the irradiation port 87a provided at the tip of the nozzle mechanism 87.

  Around the irradiation port 87a of the nozzle mechanism 87, an injection port 87b for injecting iron powder accommodated in the chamber 89 is provided on the substrate 85a side. The iron powder injected from the injection port 87b is always supplied from a chamber 89 that communicates with the injection port 87b via a supply pipe (not shown). The iron powder that has reached the injection port 87b is injected to the substrate 85a side while being focused on the laser beam L side together with a shield gas injected from a gas injection port (not shown) formed immediately before the injection port 87b. Note that the control device 82 also performs shield gas injection control.

  The iron powder sprayed to the substrate 85a side is melted and combined by the high-power laser beam L emitted from the irradiation port 87a. Then, the shape represented by the slice data is formed by scanning the scanning table 85 in the X and Y axis directions according to the slice data while simultaneously irradiating the laser beam L by the nozzle mechanism 87 and jetting the iron powder. Can do.

  Next, an example in which the hollow portion 50 of the sector mold 4 is modeled by the layered modeling apparatus 80 will be described. The enlarged view of FIG. 10 shows a state in the middle of forming the second layer based on the slice data D2 stacked on the first layer after the formation of the first layer based on the lowermost slice data D1 is completed. FIG. As shown in the figure, the slice data D2 in the second layer includes a region P1 corresponding to the shape of a part of the hollow portion 50 extending in the width direction of the sector mold 4. Similarly, the upper slice data D3; D4; D5 includes regions P2 to P4 corresponding to a part of the shape of the hollow portion 50.

  When the control device 82 scans the scanning table 85 in the direction indicated by X1 to X2 from the state shown in the figure, and the tip end portion (laser light L) of the nozzle mechanism 87 reaches the width direction one end K1 of the region P1, the control device 82 stops the scanning of the scanning table 85 in the X2 direction. After the scanning is stopped, the operator replaces the desired heat amount adjusting agent 60 different from the iron powder in the chamber 89. After the replacement of the heat amount adjusting agent 60, the control device 82 resumes scanning in the direction of the table X2. At this time, the control device 82 controls the laser output unit 90 to stop the output of the laser light L from the laser output unit 90. On the other hand, the control device 82 causes only the shielding gas to be injected, and injects the heat amount adjusting agent 60 onto the already formed first layer.

  Since the output of the laser beam L is stopped, the heat amount adjusting agent 60 injected onto the first layer is not melted and is left while maintaining its shape. The state in which the output of the laser beam L is stopped continues until the table 85 is scanned in the X2 direction and the tip of the nozzle mechanism 87 reaches the position of the other end in the width direction of the region P1. When the tip of the nozzle mechanism 87 reaches the position of the other end in the width direction of the region P1, the control device 82 stops the scanning of the table 85 in the X2 direction again. After stopping the scanning, the operator replaces the heat amount adjusting agent 60 in the chamber 89 with the original iron powder. After the replacement with the iron powder, the control device 82 ejects the iron powder onto the first layer and restarts the irradiation with the laser light L. By restarting the injection of the iron powder and the irradiation of the laser light L, the modeling other than the region P1 included in the slice data D2 and the already-shaped portion on the one end K1 side in the width direction is resumed. Thereafter, the region P1 included in the slice data D2 is made a part of the hollow portion 50 by repeating the replacement of the iron powder and the calorific value adjusting agent 60 and the stop and restart of the output of the laser beam L for the scanning in the X-axis direction. It is formed. Then, by repeating the above control for the upper slice data D3, D4, D5..., The hollow portion 50 corresponding to the shape represented by the three-dimensional CAD data can be formed in the sector mold 4, and A heat amount adjusting agent 60 made of a material different from the metal constituting the sector mold 4 can be accommodated in the hollow portion 50. In addition, by setting the injection amount of the heat amount adjusting agent 60 in advance, the volume and density of the heat amount adjusting agent 60 in the hollow portion 50 can be freely adjusted.

  In the above example, the iron powder is described as being replaced with a calorie adjusting agent 60 different from the iron powder. However, when the calorie adjusting agent 60 is an iron powder, the laser is used without stopping the scanning of the table 85. It is only necessary to stop the output of the light L and leave the iron powder. In addition, by irradiating the laser light L periodically or randomly in the regions P1, P2, P3,... Or the density may be changed.

  The example of the manufacturing method has been described above by taking the sector mold 4 according to the second embodiment as an example. However, when the sector mold 4 according to the first embodiment is manufactured, the tip portion of the nozzle mechanism 87 has the regions P1, P2, P3. , When not reaching the laser beam L, but stopping the injection of the calorie adjusting agent 60 to obtain the sector mold 4 in which the calorie adjusting agent 60 is not contained in the hollow portion 50. Can do.

  In order to manufacture the sector mold 4 according to the third embodiment, the tip of the nozzle mechanism 87 is a part of the heat transfer auxiliary part 70 in the regions P1, P2, P3,. In the example, when the position of a part of the columnar body 70a is reached, iron powder or other metal having a thermal conductivity different from that of iron is ejected and the laser beam L is irradiated to form a part of the columnar body 70a. do it.

  Moreover, in order to manufacture the sector mold 4 according to the fourth embodiment, by using the three-dimensional CAD data of the sector mold 4 provided with the hollow portions 50A; 50B at positions corresponding to the shoulder portion molding regions RSh1; RSh2, It can be manufactured easily. In addition, modeling of hollow part 50A; 50B and the accommodation method of the calorie | heat amount adjusting agent 60 are the same as that in the sector mold 4 of the said Embodiment 2. FIG.

  In order to manufacture the sector mold 4 according to the fifth embodiment, when the tip of the nozzle mechanism 87 reaches a region corresponding to a part of the heat quantity adjusting agent supply / exhaust passage 55, irradiation with the laser light L, and By stopping the injection of the heat amount adjusting agent 60, the heat amount adjusting agent supply / discharge path 55 capable of communicating the hollow portion 50 and the outside of the sector mold 4 can be formed in the sector mold 4. Thereafter, the heat amount adjusting agent 60 can be easily accommodated in the hollow portion 50 through the formed heat amount adjusting agent supply / discharge path 55. In addition, about the sector mold 4 which concerns on 6th Embodiment, the process which throws in the sector mold 4 to a heating furnace after accommodation of the calorie | heat amount adjusting agent 60 is added, and the product 60A is accommodated by melting and solidifying the calorie | heat amount adjusting agent 60. do it.

  As mentioned above, although this invention was demonstrated through several embodiment, this invention is not limited to the above-mentioned embodiment. In the above-described embodiment, the sector mold 4 that heats the crown portion C1 of the unvulcanized tire T is used as a target, the configuration having the hollow portion 50 (50A; 50B), and the inside of the hollow portion 50 (50A; 50B) Although the structure which accommodates the calorie | heat amount adjusting agent 60 was applied to FIG. 1, these structures are applied to the lower side mold 2 and the upper side mold 3 which heat the side part S1; S2 of the unvulcanized tire T as shown in FIG. You can also Naturally, it can also be applied to bead rings 8a; 8b for heating the bead portions Tb; Tb. And if each said structure is employ | adopted, necessary and sufficient calorie | heat amount will be provided until it reaches | attains an appropriate degree of vulcanization for every site | part according to the gauge thickness of the unvulcanized tire T used as a vulcanization object, or a rubber | gum kind. be able to. Therefore, at the time of completion of the vulcanization process, it is possible to prevent some parts from being overvulcanized, and it is possible to obtain a tire that satisfies the performance assumed at the time of design.

1 vulcanizer, 2 lower side mold, 3 upper side mold,
4 sector mold, 10 bladder, 50 (50A; 50B) hollow part,
55 heat quantity adjusting agent supply / discharge path, 60 heat quantity adjusting agent, 80 additive manufacturing equipment,
85 scanning table, 87 nozzle mechanism

Claims (9)

A tire vulcanization mold for transferring heat to a tire and vulcanizing the tire,
A hollow portion provided inside the tire vulcanization mold;
A heat transfer auxiliary part provided in the hollow part;
A heat amount adjusting agent that is accommodated in the hollow portion and changes heat transferability in the hollow portion;
With
The heat amount adjusting agent is made of a material different from the material of the tire vulcanizing mold ,
The tire vulcanization mold, wherein the heat transfer auxiliary part can be inserted into and removed from the hollow part .   The tire vulcanization mold according to claim 1, wherein the calorific value adjusting agent is a granular material.   The tire vulcanization mold according to claim 1 or 2, wherein the calorific value adjusting agent is a metal. Before SL hollow portion, a tire vulcanizing mold according to any one claims 1 to 3, characterized in that provided in the radially outward than the pattern molding surface in the tire vulcanizing mold. The tire vulcanization mold according to any one of claims 1 to 4 , wherein a plurality of the hollow portions are provided independently. Before the volume of Kinetsu transmission auxiliary section, the tire vulcanizing mold according to any one claims 1 to 5, characterized in that ranges from 5% to 50% relative to the volume of the hollow portion. The tire vulcanization mold according to any one of claims 1 to 6, further comprising a heat amount adjusting agent supply / exhaust passage communicating with the hollow portion and the outside. Molten metal powder on the basis of the master data for tire vulcanization mold into a plurality of slice data with sliced, bound, in the master data by stacking a plurality of metal layers corresponding to the shape represented by each slice data A tire vulcanization mold manufacturing method for shaping the tire vulcanization mold corresponding to the shape represented,
A part of the plurality of slice data includes a region corresponding to a shape of a part of a hollow portion provided inside the tire vulcanizing mold, and the melting and bonding of the metal powder body are stopped in the region, A method for producing a tire vulcanization mold, wherein the metal powder is left in the region. 9. The method of manufacturing a tire vulcanization mold according to claim 8 , further comprising a generation step of melting and solidifying the remaining metal powder in the hollow portion.