WO2017159045A1 - ゴム物品用モールドの製造方法 - Google Patents
ゴム物品用モールドの製造方法 Download PDFInfo
- Publication number
- WO2017159045A1 WO2017159045A1 PCT/JP2017/002129 JP2017002129W WO2017159045A1 WO 2017159045 A1 WO2017159045 A1 WO 2017159045A1 JP 2017002129 W JP2017002129 W JP 2017002129W WO 2017159045 A1 WO2017159045 A1 WO 2017159045A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mold
- fixing hole
- hole
- vent piece
- inspection
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
-
- 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
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- 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
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
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- 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
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
- B29D2030/0607—Constructional features of the moulds
- B29D2030/0617—Venting devices, e.g. vent plugs or inserts
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- 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
- B29L2030/002—Treads
Definitions
- the present invention relates to a method for producing a mold for a rubber article for producing a mold for a rubber article having a vent hole.
- the fixed hole diameter may not be appropriate for the outer diameter of the vent piece. Therefore, in order to securely fix the vent piece in the fixing hole, it is necessary to inspect the diameters of all the fixing holes before fixing the vent piece.
- the hole diameter of the fixed hole cannot be easily inspected, and it takes time and labor to inspect the hole diameter.
- the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to easily inspect the diameter of the fixing hole of the mold for a rubber article and securely fix the vent piece in the fixing hole.
- the present invention is a method for manufacturing a mold for rubber articles, in which a vent piece having a vent hole is fixed in a fixing hole of the mold for a rubber article to manufacture a mold for a rubber article having a vent hole.
- the vent piece is positioned between the first inspection part inserted into the fixing hole, the caulking part that is thicker than the first inspection part and fixed in the fixing hole by caulking, and the first inspection part and the caulking part, A second inspection section that is thicker than the first inspection section and thinner than the crimping section.
- the present invention it is possible to easily inspect the hole diameter of the fixing hole of the mold for a rubber article and securely fix the vent piece in the fixing hole.
- the mold for rubber articles of this embodiment is a mold for rubber molding, and is manufactured by the method for manufacturing a mold for rubber articles of this embodiment.
- the mold for rubber articles is provided in a molding apparatus for rubber articles and molds rubber articles.
- a method for producing a mold for rubber articles (hereinafter simply referred to as a mold) will be described by taking as an example the case where the mold for rubber articles is a mold for tires (mold for tire molding). Therefore, the rubber article is a tire, and the molding apparatus for the rubber article is a tire molding apparatus.
- the mold is used as a tire mold when the tire is molded (at the time of vulcanization) to mold the tire.
- FIG. 1 is a cross-sectional view showing a rubber article molding apparatus (tire molding apparatus 1) of the present embodiment, showing the tire molding apparatus 1 cut in the tire width direction (tire width direction W).
- FIG. 1 shows a part of the tire forming apparatus 1 in a closed state.
- the tire molding apparatus 1 includes a container 2 that can be opened and closed, and an annular mold 10 that houses a tire.
- the container 2 has an opening / closing mechanism for opening and closing the mold 10 and accommodates the mold 10.
- the mold 10 is mounted on the container 2 and is opened and closed by the container 2.
- the tire molding apparatus 1 heats and vulcanizes the tire in the mold 10 and molds the tire with the mold 10.
- the mold 10 is an outer mold for molding the outer surface of the tire, and includes a pair of annular side molds (upper side mold 11 and lower side mold 12), a plurality of divided molds 20, and molding surfaces 13 and 14 for molding the tire. , 21.
- the upper side mold 11 and the lower side mold 12 have molding surfaces (side molding surfaces) 13 and 14 that contact the side portions of the tire, respectively, and the tire side portions are molded by the molding surfaces 13 and 14.
- the plurality of divided molds 20 are segments divided in the circumferential direction of the mold 10 (mold circumferential direction), and are tread molds that mold the tread portion of the tire.
- the mold circumferential direction matches the tire circumferential direction (tire circumferential direction).
- the plurality of split molds 20 each have a molding surface (tread molding surface) 21 that contacts the tread portion of the tire, and the tire tread portion is molded by the molding surface 21 in a state of being annularly combined.
- the mold 10 When molding a tire, first, the mold 10 is opened, and an unvulcanized tire is placed on the molding surface 14 of the lower side mold 12. Subsequently, the mold 10 is closed and the tire is accommodated in the internal space 15 of the mold 10. In this state, the tire molding apparatus 1 heats the tire to a molding temperature (vulcanization temperature) by a heating mechanism, and pressurizes the tire with a bladder in the tire. Thus, the tire is vulcanized and molded. The mold 10 contacts the tire and molds the tire by the molding surfaces 13, 14, and 21. After the molding of the tire, the mold 10 is opened, and the molded tire (after vulcanization) is taken out from the mold 10.
- a molding temperature vulcanization temperature
- the split mold 20 includes a molding member 22 that molds a tire, a support member 23 that supports the molding member 22, and a holding member 24 that holds the molding member 22 and the support member 23.
- the molding member 22 is a design surface member having a molding surface 21 (tire molding surface), and is attached to the support member 23 by an attachment member (for example, a bolt).
- the support member 23 contacts the back surface (surface opposite to the tire) of the molding member 22 and covers the back surface (outer peripheral portion) of the molding member 22.
- the support member 23 is attached to the holding member 24 by an attachment member, and is disposed between the molding member 22 and the holding member 24.
- the holding member 24 contacts the back surface of the support member 23 and covers the back surface of the support member 23.
- the holding member 24 is attached to the container 2, and the plurality of divided molds 20 are annularly arranged in the container 2.
- the molding surface 21 is a molding part (contact part) of the molding member 22.
- the molding member 22 contacts the tire at the molding surface 21 to mold the tire.
- the molded member 22 is thinner than the support member 23 and the holding member 24, and the support member 23 is thicker than the holding member 24 and the molded member 22.
- the holding member 24 is made of steel, for example, and is formed by machining.
- the support member 23 is made of, for example, an aluminum alloy and is formed by casting.
- the forming member 22 is made of maraging steel, for example, and is formed by additive manufacturing (powder additive manufacturing or the like).
- the powder is sintered to form a molded member 22 that is a powder sintered body.
- a powder layer having a predetermined thickness is formed, the powder layer is irradiated with a light beam (for example, laser light), and the powder is sintered by the heat of the light beam.
- the hardened layer which sintered the powder is formed.
- formation of a powder layer and formation of a hardened layer are repeated, a some hardened layer is laminated
- the powder cured layer is laminated to form the molded member 22 which is a laminate of a plurality of cured layers.
- the mold 10 has a molding member 22, a support member 23, and a plurality of vent holes in each of the plurality of divided molds 20.
- the vent hole is a hole portion (vent portion) of the mold 10 that discharges air.
- the air is not confined between the tire and the mold 10 (here, the molding member 22), but is exhausted to the outside of the mold 10 through the vent hole.
- the vent hole of the split mold 20 is formed in at least the molding member 22 and the support member 23 and opens on the molding surface 21 of the molding member 22. The mold 10 molds the tire with the plurality of molding members 22 while discharging air from the vent hole.
- FIG. 2 is a diagram showing a procedure for forming the vent hole 16 of the present embodiment, and schematically shows a cross section of a part of the split mold 20 (a part for forming one vent hole 16).
- the vent piece 30 is fixed in the fixing hole 40 of the mold 10.
- the vent piece 30 has a vent hole 16 and is fixed in the fixing hole 40 of the mold 10 by caulking.
- the fixing hole 40 is formed in the mold 10 and opens on the surface of the mold 10.
- the mold 10 having the vent hole 16 is manufactured by fixing the vent piece 30 to the mold 10.
- the molding member 22 is attached to the support member 23, and the molding member 22 is supported by the support member 23 (see FIG. 2A).
- the fixing hole 40 is formed in the molding member 22 and the support member 23 of the mold 10 by drilling (see FIG. 2B).
- the fixing hole 40 is a circular hole having a circular cross section, and is formed with a predetermined hole diameter (inner diameter) D1.
- the fixing hole 40 is a through-hole penetrating the molding member 22 and the support member 23, and opens on the surface (molding surface 21) of the molding member 22.
- a circular opening 41 of the fixing hole 40 is formed on the molding surface 21 of the molding member 22.
- the fixing hole 40 extends straight from the molding surface 21 toward the inside of the molding member 22 and the support member 23, and opens on the back surface of the support member 23.
- the support member 23 is attached to the holding member 24, and the molding member 22 and the support member 23 are held by the holding member 24 (see FIG. 2C).
- the opening on the holding member 24 side of the fixing hole 40 is covered with the holding member 24.
- the vent piece 30 is inserted into the fixing hole 40 through the opening 41 of the fixing hole 40 (see FIG. 2D). Thereby, the step part 31 of the vent piece 30 comes into contact with the surface (the molding surface 21) of the molding member 22, and a part of the vent piece 30 is disposed in the fixed hole 40.
- the vent piece 30 is pushed into the fixing hole 40 and fixed in the fixing hole 40 (see FIG. 2E). At that time, for example, the vent piece 30 is press-fitted into the fixing hole 40, or the vent piece 30 is driven into the fixing hole 40. As the vent piece 30 is pushed in, at least one of the vent piece 30 and the fixing hole 40 is deformed, and the vent piece 30 is caulked. When the vent piece 30 is caulked, for example, the fixing hole 40 is deformed according to the shape of the vent piece 30. On the other hand, the vent piece 30 may be deformed according to the shape of the fixing hole 40, and both the fixing hole 40 and the vent piece 30 may be deformed.
- the vent piece 30 is fixed to the molding member 22 and the support member 23 of the mold 10 by caulking. In this state, the entire vent piece 30 and the entire vent hole 16 are disposed in the fixing hole 40. One end of the vent hole 16 opens toward the internal space 15 of the mold 10, and the other end of the vent hole 16 is disposed in the fixed hole 40. Air between the tire and the mold 10 is exhausted through the vent hole 16 of the vent piece 30. Here, after the air is discharged into the fixing hole 40 by the vent hole 16, the air passes between the support member 23 and the holding member 24 and is discharged to the outside of the mold 10.
- FIG. 3 is a side view of the vent piece 30 of the present embodiment, showing the vent piece 30 as viewed from the outside in the radial direction.
- the vent piece 30 includes one vent hole 16, two inspection parts (first inspection part 32 and second inspection part 33) used for inspection of the fixing hole 40, and caulking in the fixing hole 40.
- One caulking portion 34 is provided.
- the vent piece 30 is made of, for example, stainless steel (SUS304 (JIS standard) or the like), and is formed into a cylindrical shape by machining (turning or drilling).
- the vent hole 16 is formed with a predetermined hole diameter M and extends straight along the center line 35 of the vent piece 30.
- the center line 35 of the vent piece 30 is located at the center in the radial direction of the vent piece 30 and is orthogonal to the radial direction of the vent piece 30.
- the vent hole 16 is a circular hole having a circular cross section, and is formed at the center of the vent piece 30 including the center line 35.
- the vent hole 16 is a through-hole penetrating the vent piece 30 in the direction of the center line 35 (center line direction), and opens at both end faces of the vent piece 30 in the center line direction.
- the first inspection unit 32 includes one end portion of the vent piece 30, and the crimping portion 34 includes the other end portion of the vent piece 30.
- the second inspection part 33 is an intermediate part of the vent piece 30 and is located between the first inspection part 32 and the caulking part 34.
- the first inspection portion 32, the second inspection portion 33, and the crimping portion 34 are each formed in a cylindrical shape and are formed to have different outer diameters D2, D3, and D4.
- Two annular step portions (first step portion 31 and second step portion 36) are formed on the outer peripheral portion of the vent piece 30.
- the first step portion 31 is formed at the end of the second inspection portion 33 connected to the first inspection portion 32 due to the difference in outer diameter between the first inspection portion 32 and the second inspection portion 33.
- the second step portion 36 is formed at the end portion of the caulking portion 34 connected to the second inspection portion 33 due to the difference in outer diameter between the second inspection portion 33 and the caulking portion 34.
- the first inspection part 32 of the vent piece 30 is an insertion part that is inserted into the fixing hole 40 and is thinner than the second inspection part 33, the caulking part 34, and the fixing hole 40. That is, the outer diameter D2 of the first inspection part 32 is smaller than the outer diameter D3 of the second inspection part 33, the outer diameter D4 of the caulking part 34, and the hole diameter D1 of the fixing hole 40. Further, the outer diameter D ⁇ b> 2 of the first inspection portion 32 is a value corresponding to the lower limit value of the hole diameter D ⁇ b> 1 of the fixed hole 40, and is set to a value that allows the first inspection portion 32 to be inserted into the fixed hole 40.
- the lower limit value of the hole diameter D1 is a predetermined minimum value of the hole diameter D1 allowed as the hole diameter D1 of the fixed hole 40.
- the second inspection part 33 of the vent piece 30 is a non-insertion part that is not inserted into the fixing hole 40, and is thicker than the first inspection part 32 and the fixing hole 40 and thinner than the caulking part 34. That is, the outer diameter D3 of the second inspection portion 33 is larger than the outer diameter D2 of the first inspection portion 32 and the hole diameter D1 of the fixing hole 40, and smaller than the outer diameter D4 of the crimping portion 34. Further, the outer diameter D3 of the second inspection portion 33 is a value corresponding to the upper limit value of the hole diameter D1 of the fixed hole 40, and is set to a value at which the second inspection portion 33 cannot be inserted into the fixed hole 40.
- the upper limit value of the hole diameter D1 is a predetermined maximum value of the hole diameter D1 allowed as the hole diameter D1 of the fixed hole 40.
- the caulking portion 34 of the vent piece 30 is a fixing portion that is fixed in the fixing hole 40 of the mold 10 by caulking, and is thicker than the first inspection portion 32, the second inspection portion 33, and the fixing hole 40. That is, the outer diameter D4 of the caulking part 34 is larger than the outer diameter D2 of the first inspection part 32, the outer diameter D3 of the second inspection part 33, and the hole diameter D1 of the fixing hole 40. Further, the outer diameter D4 of the caulking portion 34 is set to a value larger than the upper limit value of the hole diameter D1 of the fixing hole 40 and a value that can fix the caulking portion 34 after the caulking to the fixing hole 40.
- the lengths L1 to L4 are the lengths (dimensions) of the vent piece 30 or the portions 32, 33, and 34 of the vent piece 30 in the center line direction of the vent piece 30.
- the length L1 of the vent piece 30 is not less than 10 times and not more than 30 times the hole diameter M of the vent hole 16 ((10 ⁇ M) ⁇ L1 ⁇ (30 ⁇ M)).
- the length L4 of the crimping portion 34 is 15% to 25% of the length L1 of the vent piece 30 ((0.15 ⁇ L1) ⁇ L4 ⁇ (0.25 ⁇ L1)).
- the length L3 of the second inspection unit 33 is not less than 5% and not more than 10% of the length L1 of the vent piece 30 ((0.05 ⁇ L1) ⁇ L3 ⁇ (0.1 ⁇ L1)).
- the length L2 of the first inspection part 32 is the remaining length obtained by subtracting the length L4 of the caulking part 34 and the length L3 of the second inspection part 33 from the length L1 of the vent piece 30.
- the length is 65% or more and 80% or less of the length L1 ((0.65 ⁇ L1) ⁇ L2 ⁇ (0.8 ⁇ L1)).
- the surface roughness Ra is an arithmetic average roughness defined in Japanese Industrial Standard (JIS B0601: 2001).
- the surface roughness Ra of the crimping portion 34 is the surface roughness of the portion that contacts the inner surface of the fixing hole 40 (the outer surface of the crimping portion 34), and is 1 ⁇ m or more and 3 ⁇ m or less.
- the surface roughness Ra of the second inspection portion 33 is the surface roughness of the portion that contacts the inner surface of the fixing hole 40 (the outer surface of the second inspection portion 33), and is 1 ⁇ m or more and 10 ⁇ m or less.
- the surface roughness Ra of the first inspection portion 32 is the surface roughness of the portion (the outer surface of the first inspection portion 32) disposed in the fixing hole 40, and is 1 ⁇ m or more and 20 ⁇ m or less.
- FIG. 4 is a view showing the fixing hole 40 inspected by the first inspection part 32 and the second inspection part 33 of the vent piece 30. 4 shows a side view of the vent piece 30 and a cross-sectional view of the split mold 20 as in FIG.
- the first inspection part 32 of the vent piece 30 is arranged in the opening 41 of the fixing hole 40 to determine whether or not the first inspection part 32 is inserted into the fixing hole 40. Thereby, it is inspected whether the hole diameter D1 of the fixed hole 40 is larger than the outer diameter D2 of the first inspection portion 32. At that time, it is determined whether or not the first inspection portion 32 can be inserted without pushing the first inspection portion 32 into the fixing hole 40, and whether or not the hole diameter D1 of the fixing hole 40 is equal to or larger than the lower limit value. inspect.
- the hole diameter D1 of the fixing hole 40 is equal to or smaller than the outer diameter D2 of the first inspection part 32. Thereby, it is determined that the hole diameter D1 of the fixed hole 40 is smaller than the lower limit value, and it is determined that the hole diameter D1 of the fixed hole 40 does not satisfy the condition of the lower limit value and is rejected.
- the hole diameter D1 of the fixing hole 40 is larger than the outer diameter D2 of the first inspection part 32.
- the hole diameter D1 of the fixed hole 40 is equal to or larger than the lower limit value, and it is determined that the hole diameter D1 of the fixed hole 40 satisfies the lower limit value condition.
- the first inspection portion 32 of the vent piece 30 inspects whether or not the hole diameter D1 of the fixed hole 40 satisfies the lower limit condition.
- the entire first inspection part 32 is inserted into the fixed hole 40.
- the second inspection part 33 When the second inspection part 33 is inserted into the fixing hole 40 (see FIG. 4B), it is determined that the hole diameter D1 of the fixing hole 40 is larger than the outer diameter D3 of the second inspection part 33. Thereby, it is determined that the hole diameter D1 of the fixed hole 40 is larger than the upper limit value, and it is determined that the hole diameter D1 of the fixed hole 40 does not satisfy the condition of the upper limit value and is rejected.
- the crimping portion 34 comes into contact with the surface of the mold 10 (the molding member 22) and stops at the position of the opening 41 of the fixing hole 40.
- the second step portion 36 of the vent piece 30 contacts the surface of the mold 10, and the first inspection portion 32 and the second inspection portion 33 are disposed in the fixing hole 40. Further, the caulking portion 34 is disposed outside the fixing hole 40 and protrudes from the opening 41. Alternatively, the caulking portion 34 is inserted into the fixing hole 40 in addition to the second inspection portion 33.
- the second inspection part 33 When the second inspection part 33 is not inserted into the fixing hole 40 (see FIG. 4C), it is determined that the hole diameter D1 of the fixing hole 40 is equal to or smaller than the outer diameter D3 of the second inspection part 33. Accordingly, it is determined that the hole diameter D1 of the fixed hole 40 is equal to or smaller than the upper limit value, and it is determined that the hole diameter D1 of the fixed hole 40 satisfies the upper limit value.
- the second inspection part 33 comes into contact with the surface of the mold 10 and stops at the position of the opening 41 of the fixing hole 40.
- the first step portion 31 of the vent piece 30 contacts the surface of the mold 10, and only the first inspection portion 32 is disposed in the fixing hole 40.
- the second inspection part 33 and the caulking part 34 are arranged outside the fixing hole 40 and protrude from the opening 41. In this way, the second inspection portion 33 of the vent piece 30 inspects whether or not the hole diameter D1 of the fixed hole 40 satisfies the upper limit condition.
- the first inspection part 32 and the second inspection part 33 of the vent piece 30 inspect whether or not the hole diameter D1 of the fixing hole 40 satisfies the allowable range of the hole diameter D1. That is, by using the first inspection unit 32 and the second inspection unit 33, it is determined whether the hole diameter D1 of the fixed hole 40 is a value within a predetermined allowable range, and the hole diameter D1 of the fixed hole 40 is inspected. .
- the hole diameter D1 of the fixing hole 40 is a value between the upper limit value and the lower limit value (above the upper limit value). And a value equal to or lower than the lower limit value).
- the hole diameter D1 of the fixed hole 40 is a value within the allowable range. Moreover, it determines with the hole diameter D1 of the fixed hole 40 satisfy
- the second inspection portion 33 is inserted into the fixing hole 40 based on the protruding length of the vent piece 30 protruding from the opening 41 of the fixing hole 40. It is determined whether or not it has been done. Specifically, the protrusion length of the vent piece 30 is measured, and the second inspection portion 33 is inserted into the fixing hole 40 based on whether the measurement value of the protrusion length satisfies a predetermined condition of the protrusion length. It is determined whether or not it has been done.
- the protruding length condition is a condition for determining that the second inspection portion 33 is not inserted into the fixing hole 40, and is based on the length L4 of the caulking portion 34 and the length L3 of the second inspection portion 33 in advance. Is set.
- the condition of the protrusion length is a reference value of the protrusion length obtained by adding the length L4 of the caulking part 34 and the length L3 of the second inspection part 33.
- the second inspection portion 33 is located in the fixing hole 40 and the second inspection portion 33 is inserted into the fixing hole 40. Determined.
- the measurement value T2 of the protrusion length satisfies the condition of the protrusion length (see FIG. 4C)
- the second inspection portion 33 is located outside the fixing hole 40 and the second inspection portion 33 is not inserted into the fixing hole 40. Is determined.
- the second inspection part 33 is overlaid on the opening 41 of the fixing hole 40.
- the opening 41 of the fixing hole 40 is covered by the second inspection part 33 (see FIG. 2D).
- the vent piece 30 is pushed into the fixing hole 40, and the caulking portion 34 of the vent piece 30 is fixed in the fixing hole 40 of the mold 10 by caulking (see FIG. 2E).
- inspection part 33 and the crimping part 34 are pushed in to the fixing hole 40, and the whole vent piece 30 is arrange
- the caulking portion 34 is disposed in the fixing hole 40 of the molding member 22 and the support member 23 and is fixed to the molding member 22 and the support member 23 by caulking.
- the second inspection unit 33 is disposed in the fixing hole 40 of the support member 23 and is fixed to the support member 23 by caulking.
- the vent piece 30 is fixed to the molding member 22 and the support member 23 of the mold 10 by caulking at least the caulking portion 34 (here, the caulking portion 34 and the second inspection portion 33).
- the molding member 22 and the support member 23 are connected by a vent piece 30 in the fixing hole 40.
- the caulking part 34 and the second inspection part 33 are in close contact with the inner surface of the fixing hole 40, and the opening 41 of the fixing hole 40 is closed by the caulking part 34 except for the vent hole 16.
- the entirety of the first inspection unit 32 is disposed in the fixing hole 40, and a gap is formed between the first inspection unit 32 and the inner surface of the fixing hole 40.
- the first inspection unit 32 is disposed in the fixing hole 40 of the support member 23.
- the hole diameter D1 of the fixing hole 40 can be easily inspected by the vent piece 30.
- the vent piece 30 can be reliably fixed in the fixing hole 40 of the mold 10 by caulking. It is also possible to inspect whether or not the hole diameter D1 of the fixing hole 40 is appropriate for the outer diameters D2, D3, and D4 of the vent piece 30. When an outer diameter defect occurs in the vent piece 30, the outer diameters D2, D3, and D4 of the vent piece 30 can be inspected.
- the length L4 of the crimping portion 34 is less than 15% of the length L1 of the vent piece 30, the force (fixing force) for fixing the crimping portion 34 to the mold 10 may be reduced.
- the length L4 of the caulking portion 34 is longer than 25% of the length L1 of the vent piece 30, it is difficult to push the caulking portion 34 into the fixing hole 40. Therefore, the length L4 of the crimping portion 34 is preferably 15% or more and 25% or less of the length L1 of the vent piece 30. Thereby, the caulking part 34 is appropriately pushed into the fixing hole 40, and the fixing force of the caulking part 34 is reliably ensured.
- the length L3 of the second inspection portion 33 is less than 5% of the length L1 of the vent piece 30, it is difficult to determine whether or not the second inspection portion 33 has been inserted into the fixing hole 40.
- the length L3 of the second inspection part 33 is longer than 10% of the length L1 of the vent piece 30, it is difficult to push the second inspection part 33 into the fixing hole 40. Therefore, the length L3 of the second inspection unit 33 is preferably 5% or more and 10% or less of the length L1 of the vent piece 30. Thereby, it is easily determined whether or not the second inspection part 33 is inserted into the fixing hole 40, and the second inspection part 33 is appropriately pushed into the fixing hole 40.
- the surface roughness Ra of the caulking portion 34 is less than 1 ⁇ m, it is difficult to process the caulking portion 34.
- the surface roughness Ra of the crimping portion 34 exceeds 3 ⁇ m, there is a possibility that the adhesion performance of the crimping portion 34 to the mold 10 (here, the molding member 22 and the support member 23) may be affected. Therefore, the surface roughness Ra of the crimping portion 34 is preferably 1 ⁇ m or more and 3 ⁇ m or less. Thereby, the crimping part 34 is processed easily and the crimping part 34 adheres to the mold 10 reliably.
- the surface roughness Ra of the second inspection unit 33 is less than 1 ⁇ m, the processing of the second inspection unit 33 becomes difficult.
- the surface roughness Ra of the second inspection part 33 exceeds 10 ⁇ m, the adhesion performance of the second inspection part 33 to the mold 10 (here, the support member 23) may be affected. Therefore, the surface roughness Ra of the second inspection section 33 is preferably 1 ⁇ m or more and 10 ⁇ m or less. Thereby, the 2nd test
- the surface roughness Ra of the first inspection unit 32 is less than 1 ⁇ m, the processing of the first inspection unit 32 becomes difficult.
- the surface roughness Ra of the first inspection unit 32 exceeds 20 ⁇ m, the heat dissipation performance of the first inspection unit 32 may be affected.
- the surface roughness Ra of the first inspection unit 32 is preferably 1 ⁇ m or more and 20 ⁇ m or less. Thereby, the 1st test
- the ratio (first ratio) of the difference between D4 and D1 with respect to D1 is (((D4-D1) / D1) ⁇ 100).
- the first ratio is less than 0.5%, the fixing force of the caulking portion 34 may be reduced.
- the first ratio exceeds 5%, the caulking portion 34 may be damaged when pushed into the fixing hole 40. Therefore, the first ratio is preferably 0.5% or more and 5% or less. Thereby, the fixing force of the crimping part 34 is ensured and the damage of the crimping part 34 is suppressed.
- the first ratio is more preferably 2% or more and 4% or less.
- the ratio (second ratio) of the difference between D3 and D1 with respect to D1 is (((D3-D1) / D1) ⁇ 100).
- the second ratio is less than 0.5%, the fixing force of the second inspection unit 33 may be reduced.
- the second ratio exceeds 3%, there is a possibility that the deformation of the second inspection portion 33 becomes large when the second ratio is pushed into the fixing hole 40. Therefore, the second ratio is preferably 0.5% or more and 3% or less. Thereby, the fixing force of the 2nd test
- the second ratio is more preferably 1% or more and 2% or less.
- the molded member 22 is formed by powder additive manufacturing using various powders (for example, metal powder and ceramic powder) that can be sintered.
- molding member 22 by forming processes (for example, machining, casting) other than powder lamination modeling.
- the molding member 22 and the support member 23 are integrally formed by casting to form the molding member 22 ′ shown in FIG. 5, and the split mold 20 of the mold 10 is held with the molding member 22 ′.
- members other than the molding member 22, the support member 23, and the holding member 24 may be provided in the split mold 20 of the mold 10.
- only the molding member 22 and the support member 23 may be provided in the split mold 20 without providing the holding member 24 in the split mold 20. That is, the mold 10 has at least a molding member 22 and a support member 23 in the split mold 20.
- the vent piece 30 may be fixed in a fixing hole 40 of a mold other than the divided mold 20 (for example, the upper side mold 11 and the lower side mold 12).
- the mold for fixing the vent piece 30 may be a mold having only one member or a mold having a plurality of members.
- a portion that does not accommodate the vent piece 30 may be formed to have a hole diameter different from the hole diameter D1 of the portion that accommodates the vent piece 30.
- the method for manufacturing the mold has been described by taking the case where the rubber article is a tire as an example, but the rubber article is not limited to the tire, and may be another rubber article.
- the rubber article is an article made of rubber formed by a mold, for example, an article made only of rubber, or an article made of rubber and another member.
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- Health & Medical Sciences (AREA)
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- Moulds For Moulding Plastics Or The Like (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
本実施形態のゴム物品用モールドは、ゴム成形用モールドであり、本実施形態のゴム物品用モールドの製造方法により製造される。ゴム物品用モールドは、ゴム物品の成形装置に設けられて、ゴム物品を成形する。
図示のように、タイヤ成形装置1は、開閉可能なコンテナ2と、タイヤを収容する環状のモールド10を備えている。コンテナ2は、モールド10を開閉する開閉機構を有し、モールド10を収容する。モールド10は、コンテナ2に装着されて、コンテナ2により開閉される。タイヤ成形装置1は、モールド10内のタイヤを加熱して加硫するとともに、モールド10によりタイヤを成形する。
図示のように、ベントホール16の形成時には、ベントピース30をモールド10の固定孔40内に固定する。ベントピース30は、ベントホール16を有し、カシメにより、モールド10の固定孔40内に固定される。固定孔40は、モールド10に形成されて、モールド10の表面に開口する。ベントピース30のモールド10への固定により、ベントホール16を有するモールド10を製造する。
図示のように、ベントピース30は、1つのベントホール16と、固定孔40の検査に用いられる2つの検査部(第1検査部32、第2検査部33)と、固定孔40内でカシメられる1つのカシメ部34を有する。ベントピース30は、例えば、ステンレス鋼製(SUS304(JIS規格)等)であり、機械加工(旋盤加工、孔加工)により円筒状に形成される。ベントホール16は、所定の孔径Mに形成され、ベントピース30の中心線35に沿って真っ直ぐに延びる。ベントピース30の中心線35は、ベントピース30の径方向の中心に位置し、ベントピース30の径方向に直交する。
図示のように、ベントピース30を固定孔40に固定するときに、ベントピース30の第1検査部32と第2検査部33を用いて、固定孔40の孔径D1を検査する。まず、ベントピース30の第1検査部32を固定孔40の開口部41に配置して、第1検査部32が固定孔40に挿入されるか否かを判別する。これにより、固定孔40の孔径D1が第1検査部32の外径D2よりも大きいか否かを検査する。その際、第1検査部32を固定孔40に押し込まずに、第1検査部32の挿入が可能な否かを判別して、固定孔40の孔径D1が下限値以上であるか否かを検査する。
Claims (7)
- ベントホールを有するベントピースをゴム物品用モールドの固定孔内に固定して、ベントホールを有するゴム物品用モールドを製造するゴム物品用モールドの製造方法であって、
ベントピースは、固定孔に挿入される第1検査部と、第1検査部よりも太く、カシメにより固定孔内に固定されるカシメ部と、第1検査部とカシメ部の間に位置し、第1検査部よりも太く、かつ、カシメ部よりも細い第2検査部と、を有し、
ベントピースの第1検査部が固定孔に挿入され、かつ、ベントピースの第2検査部が固定孔に挿入されないときに、ベントピースのカシメ部をカシメにより固定孔内に固定するゴム物品用モールドの製造方法。 - 請求項1に記載されたゴム物品用モールドの製造方法において、
ベントピースの第1検査部が固定孔に挿入されるか否かを判別して、固定孔の孔径が第1検査部の外径よりも大きいか否かを検査する工程と、
ベントピースの第1検査部が固定孔に挿入されたときに、ベントピースの第2検査部が固定孔に挿入されるか否かを判別して、固定孔の孔径が第2検査部の外径よりも小さいか否かを検査する工程と、
ベントピースの第2検査部が固定孔に挿入されないときに、ベントピースを固定孔に押し込み、ベントピースのカシメ部をカシメにより固定孔内に固定する工程と、
を有するゴム物品用モールドの製造方法。 - 請求項1又は2に記載されたゴム物品用モールドの製造方法において、
ゴム物品用モールドは、ゴム物品を成形する成形部材と、成形部材を支持する支持部材と、を有し、
固定孔は、成形部材と支持部材に形成されて、成形部材の表面に開口し、
ベントピースのカシメ部は、カシメにより成形部材の固定孔内に固定されるゴム物品用モールドの製造方法。 - 請求項1ないし3のいずれかに記載されたゴム物品用モールドの製造方法において、
ベントピースのカシメ部の長さは、ベントピースの長さの15%以上25%以下の長さであるゴム物品用モールドの製造方法。 - 請求項1ないし4のいずれかに記載されたゴム物品用モールドの製造方法において、
ベントピースの第2検査部の長さは、ベントピースの長さの5%以上10%以下の長さであるゴム物品用モールドの製造方法。 - 請求項1ないし5のいずれかに記載されたゴム物品用モールドの製造方法において、
ベントピースのカシメ部の表面粗さRaは、1μm以上3μm以下であるゴム物品用モールドの製造方法。 - 請求項1ないし6のいずれかに記載されたゴム物品用モールドの製造方法において、
ベントピースの第2検査部の表面粗さRaは、1μm以上10μm以下であるゴム物品用モールドの製造方法。
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EP17766053.7A EP3431244A4 (en) | 2016-03-15 | 2017-01-23 | METHOD FOR PRODUCING A FORM FOR RUBBER ARTICLES |
US16/082,367 US10549457B2 (en) | 2016-03-15 | 2017-01-23 | Method for manufacturing mold for rubber article |
CN201780017717.9A CN108778657B (zh) | 2016-03-15 | 2017-01-23 | 橡胶物品用模型的制造方法 |
JP2018505300A JPWO2017159045A1 (ja) | 2016-03-15 | 2017-01-23 | ゴム物品用モールドの製造方法 |
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CN110653969A (zh) * | 2018-06-29 | 2020-01-07 | 通伊欧轮胎株式会社 | 轮胎硫化模具用通气套管及轮胎硫化模具 |
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