WO2022269940A1 - タイヤ成形用金型及びタイヤ製造方法 - Google Patents
タイヤ成形用金型及びタイヤ製造方法 Download PDFInfo
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- WO2022269940A1 WO2022269940A1 PCT/JP2021/043047 JP2021043047W WO2022269940A1 WO 2022269940 A1 WO2022269940 A1 WO 2022269940A1 JP 2021043047 W JP2021043047 W JP 2021043047W WO 2022269940 A1 WO2022269940 A1 WO 2022269940A1
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- Prior art keywords
- tire
- tread
- design surface
- molding
- holder
- Prior art date
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- 238000000465 moulding Methods 0.000 title claims abstract description 112
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000004073 vulcanization Methods 0.000 claims description 6
- 230000005489 elastic deformation Effects 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 description 7
- 229920003051 synthetic elastomer Polymers 0.000 description 3
- 239000005061 synthetic rubber Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/20—Opening, closing or clamping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/42—Moulds for making articles of definite length, i.e. discrete articles for undercut articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/42—Moulds for making articles of definite length, i.e. discrete articles for undercut articles
- B29C2043/425—Moulds for making articles of definite length, i.e. discrete articles for undercut articles mould parts or sliders being movable independently from the mould halves for making undercut portions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
Definitions
- the present invention relates to a tire molding die and a tire manufacturing method.
- an annular tread molding part that molds the tread of a tire is used as a tire molding mold for vulcanizing and molding an unvulcanized green tire to produce a tire. It is known that the opening is divided into a plurality of segments aligned in parallel, and is configured to open and close by moving each segment in the radial direction (see, for example, Patent Documents 1 to 3).
- the tread design is applied to the tread design surface facing radially inward of each segment.
- projections such as ribs or blades projecting radially inward from the surface are provided.
- the present invention has been made in view of the above problems, and its object is to provide a tire molding die and a tire manufacturing method that can reduce the undercut resistance of projections against the tread when the tire is released from the mold. to provide.
- a tire molding die of the present invention comprises an annular tread molding portion which is divided into a plurality of segments arranged in a circumferential direction and configured to open and close by moving the respective segments in a radial direction.
- a plurality of design surface division mold parts each having a tread design surface for molding the tread of the tire, and arranged side by side in a circumferential direction inside the holder in a radial direction; and the holder and the plurality of design surface division molds.
- the leaf spring member elastically deforms radially inward, so that the plurality of design surface division mold portions move along an axis parallel to the axis of the tread molding portion. It is characterized in that it is configured to move in a direction away from the holder while rotating about the center.
- one circumferential end portion of the leaf spring member is fixed to one circumferential end surface of the holder, and the leaf spring member has a circular shape.
- the other end in the circumferential direction may be fixed to the end surface of the holder on the other side in the circumferential direction.
- the tire molding die of the present invention can be configured to include a plurality of the leaf spring members arranged at intervals in a direction parallel to the axis of the tread molding portion. .
- a tire manufacturing method includes a tire having an annular tread forming portion which is divided into a plurality of segments arranged in a circumferential direction and configured to open and close by moving each of the segments in a radial direction.
- a plurality of design surface division mold portions are provided side by side, and when the respective segments are moved radially outward to open the tread forming portion, the leaf spring member is elastically deformed radially inward.
- the tire is released from the tread molding portion while rotating the plurality of design surface dividing mold portions about an axis parallel to the axis of the tread molding portion.
- FIG. 2 is a cross-sectional view of the tread forming portion shown in FIG. 1 in a plan view;
- FIG. 2 is a front sectional view of the tire molding die shown in FIG. 1 in an opened state;
- FIG. 2 is a plan view cross-sectional view of the tread forming portion shown in FIG. 1 in an opened state;
- FIG. 2 is a cross-sectional view in a front view showing an enlarged detailed structure of a main part of the tire molding die shown in FIG. 1 ;
- FIG. 6 is a plan view cross-sectional view of one segment shown in FIG. 5 ;
- FIG. 6 is a view of one segment shown in FIG. 5 viewed from the radially inner side;
- FIG. 4 is a cross-sectional view showing a fixing structure of the design surface dividing mold portion to the leaf spring member;
- FIG. 6 is a cross-sectional view of one segment shown in FIG. 5 in a plan view showing a state when the tire is released from the mold;
- a tire molding die 1 according to an embodiment of the present invention shown in FIG. 1 vulcanizes a raw tire formed mainly of unvulcanized (before vulcanization) synthetic rubber into a predetermined shape. It is used to manufacture the tire 2 by molding.
- the tire 2 is made mainly of synthetic rubber, has a pair of sidewalls 2a and 2b and a tread 2c, and is a hollow tire formed in a shape having a space filled with gas such as air or nitrogen. is.
- the tire molding die 1 has a sidewall molding portion 10 and a tread molding portion 20 .
- the sidewall molding portion 10 includes, for example, an annular lower sidewall molding portion 11 fixed to the upper surface of the lower container 3 and an annular upper sidewall molding portion 12 fixed to the lower surface of the upper container 4. can be configured with
- the sidewall molding portion 10 has an annular tire 2 or green tire between the lower sidewall molding portion 11 and the upper sidewall molding portion 12, and the central axis thereof coincides with the central axis O of the sidewall molding portion 10. It can be placed (stored) in a coaxial posture.
- the lower sidewall molding portion 11 has an annular, upward-facing lower sidewall design surface 11a centered on the central axis O. 1), the outer surface of the sidewall 2a can be molded.
- the upper sidewall molding portion 12 has an annular downward upper sidewall design surface 12a centered on the central axis O. 1) can be shaped. As shown in FIG.
- the upper container 4 moves upward relative to the lower container 3 (in the direction in which the two move away from each other along the central axis of the tire 2), thereby opening the sidewall forming portion 10 and opening the tire. 2 is released from the sidewall molded portion 10 .
- the sidewall forming section 10 is closed from the open state to a state in which the tire 2 or green tire can be formed.
- the configuration of the sidewall molding section 10 can be changed as appropriate, for example, the configuration in which the lower container 3 moves downward relative to the upper container 4 to open.
- the tread molded portion 20 has an annular shape coaxial with the sidewall molded portion 10 and is arranged adjacent to the outer side in the radial direction of the lower sidewall molded portion 11 and the upper sidewall molded portion 12 .
- the inner peripheral surface of the tread forming portion 20 facing radially inward serves as a tread design surface 20a for forming the outer peripheral surface of the tread 2c of the tire 2. As shown in FIG.
- the tread forming portion 20 is divided into a plurality of segments 21 arranged in the circumferential direction.
- Each segment 21 has an arc shape in a plan view, and is combined in the circumferential direction to form a tread molding portion 20 that forms an annular mold as a whole.
- the tread forming portion 20 is divided into nine segments 21 having the same length in the circumferential direction.
- the number of divisions of the tread forming portion 20 in the circumferential direction is preferably 7 to 13, but is not limited to this and can be changed as appropriate.
- each segment 21 is fixed to the inside of the corresponding intermediate container 5 on its outer peripheral surface facing radially outward, and is driven by the intermediate container 5 to drive the axis of the tread forming portion 20 (central axis). O) and moves radially.
- the tread forming portion 20 can be opened and closed by radially moving each segment 21 .
- the intermediate container 5 has a tapered surface 5a on the outer peripheral surface facing radially outward, the tapered surface 5a being inclined so that the outer diameter gradually decreases upward.
- an annular outer ring 6 arranged radially outside the intermediate container 5 is fixed to the lower surface of the upper container 4 .
- the outer ring 6 has a tapered surface 6a on the inner peripheral surface facing radially inward, the tapered surface 6a being inclined so that the outer diameter gradually decreases upward.
- the outer ring 6 is connected to each intermediate container 5 by a guide member or the like (not shown) so that the tapered surface 6a slides along the tapered surface 5a of the intermediate container 5 in the vertical direction.
- each intermediate container 5 moves radially outward about the axial center of the tread forming portion 20 .
- each segment 21 is driven by the corresponding intermediate container 5 as shown in FIGS. and move radially outward together with the intermediate container 5 .
- the tread forming portion 20 is opened to a position where the tread design surface 20a is separated from the tire 2 or the tread 2c of the raw tire.
- the tread molding section 20 is opened as described above, the tread molding section 20 is located at a position (above the position shown in FIG. position).
- the tread moldings 20 are lowered to a position adjacent to the lower sidewall moldings 11, and then the outer rings 6 are positioned intermediate each other. It moves downward with respect to the container 5 , and each intermediate container 5 moves radially inward about the axis of the tread forming portion 20 .
- each segment 21 is driven by the corresponding intermediate container 5 and moves radially inward together with the intermediate container 5, and the tread forming portion 20 is formed from the tire 2 or raw material. It is closed to the extent that the tire can be molded.
- the annular tread molding portion 20 is divided into a plurality of segments 21 arranged in the circumferential direction, and each segment 21 moves in the radial direction. It is configured to open and close by
- the opening and closing mechanism of the tread forming portion 20 is not limited to the configuration using the outer ring 6, and various configurations can be adopted.
- the tire molding die 1 is provided with a bladder 7 which is arranged inside a green tire and expands when supplied with pressurized steam.
- the tire molding die 1 also includes heaters (not shown) for heating the sidewall molding portion 10 and the tread molding portion 20 .
- the installation location of the heater can be set as appropriate.
- the plurality of segments 21 forming the tread molding portion 20 are each provided with a holder 22 and a radially inner circumferential portion of the holder 22 . and a plurality of design surface division mold parts 23 arranged side by side in the direction.
- each of the segments 21 has five design surface division mold sections 23 .
- the holder 22 is a portion that is fixed to the intermediate container 5 and driven radially outward by the intermediate container 5 when the tread forming portion 20 is opened.
- the holder 22 is driven radially inwardly by the intermediate container 5 when the tread forming section 20 is closed.
- the holder 22 can be formed by cutting a block made of metal such as low carbon steel.
- the holder 22 is detachably fixed to the intermediate container 5 .
- a plurality of types of segments 21 having different shapes of tread design surfaces 20a can be selectively attached to the intermediate container 5, and the tire molding die 1 can be used for many types of tires 2 having different tread patterns. can be applied to the manufacture of
- the five design surface dividing mold parts 23 are parts constituting the tread design surface 20a for molding the tread 2c of the tire 2, respectively. As shown in FIGS. 6 and 7, each of the five designed surface dividing mold portions 23 has an arc shape in a plan view, and extends in the direction of the axis (center axis O) of the tread molding portion 20 (the width direction of the tire 2). It has an elongated rod shape that extends in a wavy shape toward the .
- the five design surface division mold portions 23 have the same shape, and two adjacent design surface division mold portions 23 are in contact with each other at their end surfaces in the circumferential direction.
- the radially inwardly facing surfaces of the five design surface division mold portions 23 respectively constitute part of the tread design surface 20a divided in the circumferential direction. That is, the tread design surface 20 a of the tread forming portion 20 is divided in the circumferential direction by the design surface division mold portions 23 provided for each of the plurality of segments 21 . Therefore, while the tread forming portion 20 is divided into 9 pieces in the circumferential direction, the tread design surface 20a is divided into 45 pieces in the circumferential direction. .
- the tread design surface 20a provided in the design surface split mold portion 23 is provided with a plurality of protrusions 24 that protrude radially inward from the tread design surface 20a. ing.
- the plurality of protrusions 24 form grooves, sipes, etc. that form a tread pattern on the tread 2c of the tire 2 during vulcanization molding.
- the plurality of protrusions 24 can be of various shapes or large (lengths) corresponding to the tread pattern, such as those extending in the tire width direction and those extending in the tire circumferential direction.
- the design surface dividing mold part 23 is preferably formed by casting a metal material with high thermal conductivity such as an aluminum alloy.
- rib-shaped or blade-shaped protrusions 24 made of steel may be integrated with the design surface division mold portion 23 when the design surface division mold portion 23 is cast. can be done.
- the leaf spring member 25 includes a leaf spring body 25a and a pair of leaf spring body 25a and a pair of leaf spring body 25a that are integrally connected to both circumferential ends of the leaf spring body 25a to form both circumferential ends of the leaf spring member 25. It is set as the structure provided with the fixing
- the leaf spring main body 25a has an arc shape in a plan view, and is attached to the holder 22 so as to contact the radially inner surface of the holder 22 and the radially outer surfaces of the five design surface split mold portions 23. It is arranged in a state of being sandwiched between five design surface dividing mold parts 23 . Further, as shown in detail in FIG. 8, the plate spring main body 25a is attached to the radially outer side surface of each of the design surface division mold portions 23 by means of a bolt 26 inserted through the hole portion 22a of the holder 22 from the radially outer side. Fixed.
- one fixing portion 25b has a shape bent radially outward from a circumferential end portion of the leaf spring main body 25a, and is positioned on one side of the holder 22 in the circumferential direction. It is fixed to the end face using fixing means (not shown) such as a screw member.
- the other fixing portion 25b has a shape bent radially outward from a circumferential end portion of the plate spring main body 25a, and is attached to the other circumferential end surface of the holder 22, for example, It is fixed using fixing means (not shown) such as a screw member.
- the plate spring member 25 has a fixing portion 25b fixed to the holder 22 as a fulcrum, and the plate spring body 25a changes from an arc shape concave radially outward in a plan view to a shape convex radially inward. It can be elastically deformed.
- the leaf spring main body 25a is elastically deformed into a shape that protrudes radially inward, the five design surface division mold portions 23 fixed to the leaf spring main body 25a move from their prescribed positions to the holder together with the leaf spring main body 25a. 22 in a direction away from it.
- the defined position is a position where the tread design surfaces 20a provided on the design surface dividing mold portions 23 are continuously connected along the circumferential direction.
- the segment 21 includes a plurality of leaf spring members 25 arranged at intervals in a direction parallel to the axis (central axis O) of the tread molding portion 20 between the holder 22 and the design surface division mold portions 23.
- a direction parallel to the axis of the tread molding portion 20 (the width direction of the tire 2) is provided between the holder 22 and each of the design surface dividing mold portions 23.
- two leaf spring members 25 are provided with an interval therebetween.
- the number of leaf spring members 25 may be one, or three or more.
- a green tire is placed inside the tire molding die 1 with the sidewall molding section 10 and the tread molding section 20 opened, and then the sidewall molding section 10 and the tread molding section 20 are closed. do.
- pressurized steam is supplied to the bladder 7 disposed inside the green tire to inflate the bladder 7, and both sidewalls of the green tire are formed into the lower sidewall design surface 11a or the upper side of the sidewall molding portion 10, respectively.
- the tread is pressed against the tread design surface 20a of the tread forming portion 20.
- the sidewall molding portion 10 and the tread molding portion 20 are heated by the heater, and the synthetic rubber constituting the raw tire is vulcanized by the heat, and the tire 2 is molded into a predetermined shape.
- the sidewall molding section 10 and the tread molding section 20 are opened, and the molded tire 2 is taken out.
- each design surface dividing mold portion 23 has a holder 22 A driving force is applied to resist the adhesion force generated between the tread 2c of the tire 2 and the inner peripheral surface of the tread design surface 20a and the undercut resistance generated between the tread 2c of the tire 2 and the protrusion 24 via the It will be.
- the five designed surface dividing mold portions 23 in each segment 21 are fixed to leaf spring members 25 fixed to the holders 22, respectively.
- the holder 22 Due to the adhesion force generated between the tread 2c of the tire 2 and the inner peripheral surface of the tread design surface 20a and the undercut resistance generated between the tread 2c of the tire 2 and the protrusion 24, the holder 22 is pulled away from the holder 22. .
- the leaf spring main body 25a of the leaf spring member 25 is elastically deformed in a radially inwardly convex direction, thereby dividing each designed surface.
- the mold part 23 spontaneously moves (pan action) in a direction away from the holder 22 .
- the four designed surface dividing mold portions 23, which are displaced from the center position of the holder 22 in the circumferential direction toward both end portions in the circumferential direction, are arranged so that the posture of the tire 2 with respect to the tread 2c changes. Then, it moves away from the holder 22 while rotating or turning about an axis parallel to the axis of the tread forming portion 20 (the width direction of the tire 2). Therefore, these four design surface dividing mold portions 23 move in a direction away from the tread 2c while rotating with respect to the tread 2c of the tire 2 about an axis parallel to the axis of the tread forming portion 20. Become.
- the tread molding portion 20 when the tread molding portion 20 is opened after vulcanization molding of the tire 2, the tread molding portion 20 is radially inward of the leaf spring member 25.
- the tire 2 is moved away from the tread molding portion 20 while rotating the design surface dividing mold portion 23 with respect to the tread 2c of the tire 2 around an axis parallel to the axis of the tread molding portion 20 by elastic deformation. can be modeled.
- the tread of the tire 2 is set so that the design surface dividing mold portions 23, which are particularly arranged on both ends in the circumferential direction, are in a posture that reduces the undercut resistance generated by the protrusions 24 against the tread 2c of the tire 2. 2c can be released from the tread molded portion 20, the undercut resistance of the protrusions 24 to the tread 2c when releasing the tire 2 can be reduced.
- the tire molding die 1 or the tire manufacturing method of the present embodiment when the tire 2 is released from the tread molding portion 20, the undercut resistance becomes excessively large, and the molded tire 2 It is possible to suppress problems such as permanent deformation of the tread 2c and breakage of the projections 24.
- the design surface dividing mold portions 23 arranged on both circumferential end side portions of the leaf spring member 25 are elastically deformed toward the inner side in the radial direction so that the tread of the tire 2 is opened.
- the tread 2c of the tire 2 is gradually released from both ends of the segment 21 in the circumferential direction.
- outside air is gradually introduced between the tread design surface 20a and the tread 2c from both ends in the circumferential direction, so that the tread 2c of the tire 2 in close contact with the tread design surface 20a is more effectively shaped into a tread design.
- the tire 2 can be more easily released from the tread molded portion 20 by peeling off from the surface 20a.
- the undercut resistance of the protrusions 24 against the tread 2c when releasing the tire 2 can be reduced, and the tread design surface 20a can be Since the tread 2c of the tire 2 in close contact can be more effectively separated from the tread design surface 20a, the driving force applied to the segment 21 when the tire 2 is released from the mold can be reduced, and the mold for tire molding can be opened. 1 can be downsized to reduce manufacturing costs.
- the undercut resistance of the protrusions 24 against the tread 2c when releasing the tire 2 can be reduced, so that a more complicated tread can be formed.
- a tire 2 having a pattern can be manufactured relatively easily. Thereby, the degree of freedom in manufacturing the tire 2 having a complicated tread pattern can be increased.
- one fixing portion 25b constituting one circumferential end portion of the leaf spring member 25 is fixed to one circumferential end surface of the holder 22 so that the plate spring member 25 is Since the other fixing portion 25b constituting the other circumferential end portion of the spring member 25 is fixed to the other circumferential end surface of the holder 22, the leaf spring member 25 is fixed to the other circumferential end surface of the holder 22.
- the portion between the portions 25b, that is, the plate spring main body 25a can be easily elastically deformed radially inward, so that the undercut resistance of the projections 24 against the tread 2c when the tire 2 is released from the mold can be effectively reduced. can be substantially reduced.
- the tire molding die 1 of the present embodiment is configured to include a plurality of leaf spring members 25 arranged at intervals in a direction parallel to the axis of the tread molding portion 20, a plurality of designs can be obtained.
- a configuration in which the surface-divided mold portion 23 is supported by a plurality of plate spring members 25 can be employed.
- the plate spring member 25 elastically deforms from an arcuate shape that is concave radially outward to a shape that is convex radially inward, the plurality of design surface dividing mold portions 23 are more stably formed.
- the leaf spring member 25 rotates and moves away from the holder 22, so that the undercut resistance or the adhesion force of the protrusion 24 to the tread 2c when the tire 2 is released from the mold is effectively reduced. can be reduced to
- the tire molding die of the example has the above configuration, the designed surface division die part is made of aluminum alloy (AC4C), the difference between the maximum inner diameter and the minimum inner diameter is 35 mm, and the holder is made of low carbon steel.
- a tire with an inner diameter of 600 mm and a tire width of 255 mm was manufactured by a machining method made of (S45C equivalent material), and a leaf spring that deformed by about 1 mm when a load of 100 kg was applied was used.
- the external force (driving force applied to the holder) required to release the mold was measured. As a result, it was confirmed that the external force of the tire molding die of the example can be reduced by about 22% compared to the tire molding die of the comparative example in which the design surface division mold part is fixed to the holder. .
- each of the segments 21 is configured to have five design surface division mold portions 23, but if it has a plurality of design surface division mold portions 23, four A configuration having one or less design surface division mold portions 23 may be employed, or a configuration having six or more design surface division mold portions 23 may be employed.
- the holder 22 of the segment 21 is fixed to the intermediate container 5, but the holder 22 may be integrated with the intermediate container 5.
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- Mechanical Engineering (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims (4)
- 円周方向に並ぶ複数のセグメントに分割されるとともにそれぞれの前記セグメントが径方向に移動することで開閉するように構成された円環状のトレッド成形部を備え、未加硫の生タイヤをタイヤに加硫成形するタイヤ成形用金型であって、
それぞれの前記セグメントが、
前記トレッド成形部が開かれるときに径方向外側に向けて駆動されるホルダと、
それぞれ前記タイヤのトレッドを成形するトレッド意匠面を備え、前記ホルダの径方向内側に円周方向に並べて配置された複数の意匠面分割金型部と、
前記ホルダと複数の前記意匠面分割金型部との間に配置され、複数の前記意匠面分割金型部が固定されるとともに円周方向の両端部において前記ホルダに固定された板バネ部材と、を有し、
前記タイヤの加硫成形後に前記トレッド成形部が開かれるときに、前記板バネ部材が径方向内側に向けて弾性変形することで、複数の前記意匠面分割金型部が、前記トレッド成形部の軸線と平行な軸を中心として回動しながら前記ホルダから離間する方向に移動するように構成されていることを特徴とするタイヤ成形用金型。 - 前記板バネ部材の円周方向の一端部が、前記ホルダの円周方向の一方側の端面に固定され、前記板バネ部材の円周方向の他端部が、前記ホルダの円周方向の他方側の端面に固定されている、請求項1に記載のタイヤ成形用金型。
- 前記トレッド成形部の軸線と平行な方向に間隔を空けて配置された複数の前記板バネ部材を備えている、請求項1または2に記載のタイヤ成形用金型。
- 円周方向に並ぶ複数のセグメントに分割されるとともにそれぞれの前記セグメントが径方向に移動することで開閉するように構成された円環状のトレッド成形部を備えたタイヤ成形用金型を用いて、未加硫の生タイヤを加硫成形してタイヤを製造するタイヤ製造方法であって、
前記トレッド成形部に、それぞれ板バネ部材に固定されるとともに円周方向に並べて設けられた複数の意匠面分割金型部を設け、
それぞれの前記セグメントを径方向外側に移動させて前記トレッド成形部を開くときに、前記板バネ部材を径方向内側に向けて弾性変形させつつ複数の前記意匠面分割金型部を前記トレッド成形部の軸線と平行な軸を中心として回動させながら、前記タイヤを前記トレッド成形部から離型させることを特徴とするタイヤ製造方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP21947219.8A EP4360844A1 (en) | 2021-06-22 | 2021-11-24 | Tire molding die and tire production method |
CN202180099459.XA CN117545608A (zh) | 2021-06-22 | 2021-11-24 | 用于形成轮胎的模具及轮胎生产方法 |
Applications Claiming Priority (2)
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JP2021-103646 | 2021-06-22 | ||
JP2021103646A JP2023002402A (ja) | 2021-06-22 | 2021-06-22 | タイヤ成形用金型及びタイヤ製造方法 |
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CN117564224A (zh) * | 2024-01-17 | 2024-02-20 | 山东豪迈机械科技股份有限公司 | 一种轮胎模具铸造石膏圈 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2003008169A1 (fr) * | 2001-07-17 | 2003-01-30 | Bridgestone Corporation | Moule de vulcanisation de pneumatiques |
JP2006021357A (ja) * | 2004-07-06 | 2006-01-26 | Toyo Tire & Rubber Co Ltd | タイヤ成型用金型及びそれにより成型された空気入りタイヤ |
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- 2021-06-22 JP JP2021103646A patent/JP2023002402A/ja active Pending
- 2021-11-24 EP EP21947219.8A patent/EP4360844A1/en active Pending
- 2021-11-24 WO PCT/JP2021/043047 patent/WO2022269940A1/ja active Application Filing
- 2021-11-24 CN CN202180099459.XA patent/CN117545608A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2003008169A1 (fr) * | 2001-07-17 | 2003-01-30 | Bridgestone Corporation | Moule de vulcanisation de pneumatiques |
JP2006021357A (ja) * | 2004-07-06 | 2006-01-26 | Toyo Tire & Rubber Co Ltd | タイヤ成型用金型及びそれにより成型された空気入りタイヤ |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN117564224A (zh) * | 2024-01-17 | 2024-02-20 | 山东豪迈机械科技股份有限公司 | 一种轮胎模具铸造石膏圈 |
CN117564224B (zh) * | 2024-01-17 | 2024-04-23 | 山东豪迈机械科技股份有限公司 | 一种轮胎模具铸造石膏圈 |
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