WO2018003329A1 - Centrifugal forming mold and method for manufacturing cylindrical body - Google Patents

Centrifugal forming mold and method for manufacturing cylindrical body Download PDF

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Publication number
WO2018003329A1
WO2018003329A1 PCT/JP2017/018350 JP2017018350W WO2018003329A1 WO 2018003329 A1 WO2018003329 A1 WO 2018003329A1 JP 2017018350 W JP2017018350 W JP 2017018350W WO 2018003329 A1 WO2018003329 A1 WO 2018003329A1
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WO
WIPO (PCT)
Prior art keywords
cylindrical body
mold
centrifugal
centrifugal mold
lid
Prior art date
Application number
PCT/JP2017/018350
Other languages
French (fr)
Japanese (ja)
Inventor
泰 栄木
Original Assignee
クオドラントポリペンコジャパン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by クオドラントポリペンコジャパン株式会社 filed Critical クオドラントポリペンコジャパン株式会社
Priority to CN201780039229.8A priority Critical patent/CN109476052A/en
Priority to KR1020187037463A priority patent/KR20190025845A/en
Publication of WO2018003329A1 publication Critical patent/WO2018003329A1/en

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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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/38—Moulds, cores or other substrates
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/36—Feeding the material on to the mould, core or other substrate
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/52—Measuring, controlling or regulating

Definitions

  • the present invention relates to a centrifugal mold, and more particularly, to a centrifugal mold having a tubular mold body for molding a cylindrical body and a closing member detachably provided at both ends of the mold body.
  • the present invention also relates to a method of manufacturing a cylindrical body using this centrifugal mold.
  • a raw material resin is injected into a centrifugal mold composed of a tubular mold body and a lid that closes the opening of the mold body, and the mold is rotated about an axis.
  • a centrifugal molding method in which a raw material resin is cured while being allowed to occur (see, for example, Patent Document 1).
  • FIG. 23 a shows the centrifugal mold described in Patent Document 1.
  • the centrifugal mold 10 includes a tubular mold body 11 and a pair of lids 12 that cover both end openings of the mold body 11. With one lid attached to the mold body, the raw material resin is injected into the mold body 11, and the other lid is attached to close both ends of the mold body. Next, a cylindrical molded product along the inner peripheral surface of the mold body 11 is obtained by rotating the mold 10 at a high speed around the mold axis.
  • the lock device 21 for fixing the lid 12 to the mold body 11 can be tilted by a lock claw support portion 22 provided at three intervals on the outer periphery of the lid 12 at equal intervals, and a pin 23 on each lock claw support portion. It has a lock claw 24 attached and a lock spring 25 for urging the lock claw 24 in the lock direction, and a locking part 26 provided at the tip of the lock claw 24 is provided with a mold body.
  • the lid 12 can be fixed in a state of covering the opening of the mold body 11 by engaging with the outer edges of the flanges 13 provided at both ends of the mold 11.
  • the rear end portion of the lock claw 24 protrudes from the outer surface of the lid.
  • a seal plate 32 is provided on the inner surface of the lid 12 to cover the tubular portion opening 31 of the mold body 11.
  • the seal plate 32 is supported by three guide bolts 33 penetrating the lid 12 so as to be movable in the mold axial direction, and in the direction of the tubular portion opening 31 by a pressure contact spring 34 sheathed on the guide bolt 33. It is energized towards.
  • a ring-shaped groove 35 provided on the outer peripheral side of the seal plate 32 is provided with a ring-shaped seal material 35 that contacts the end surface of the mold body 11.
  • the pressure contact spring 34 pushes the seal plate 32 to the mold body end surface with a strong force. Press. Thereby, the tubular portion opening 31 is reliably sealed, and at the same time, the locking state between the locking portion 26 and the flange 13 is held together with the lock spring 25.
  • FIG. 23 b shows the cylindrical body 1 formed by this centrifugal molding and removed from the mold 10.
  • the inner peripheral edge 1i of the inner hole 1h in the end surface 1a of the cylindrical body 1 does not become a circle with a predetermined diameter or the inner peripheral edge 1i deviates from the predetermined position due to eccentricity of the centrifugal mold.
  • An object of the present invention is to provide a centrifugal mold that can easily find the shape irregularity of the inner peripheral edge of the end face of a cylindrical body, and a method of manufacturing a cylindrical body using the same.
  • the centrifugal mold of the present invention is a centrifugal mold having a tubular mold body for centrifugally molding a cylindrical body and a closing member for closing an opening of the mold body, and the centrifugal molding of the closing member
  • a concave portion or a convex portion for forming a convex portion or a concave portion on the end surface of the molded cylindrical body is provided concentrically on the inner surface of the closing member facing the inside of the mold.
  • the concave portion or the convex portion on the inner surface of the closing member is provided in the vicinity of the inner peripheral edge of the cylindrical body.
  • the concave portion or the convex portion on the inner surface of the closing member is provided along the inner peripheral edge of the cylindrical body.
  • the cross-sectional ridge line of the convex portion or the concave portion of the closing member is configured by a curve.
  • the convex portion or the concave portion of the blocking member is provided to inspect the inner diameter accuracy of the cylindrical body.
  • a plurality of convex portions or concave portions of the closing member are provided at intervals in the circumferential direction.
  • the convex portion or concave portion of the closing member is provided continuously in the circumferential direction.
  • the method for producing a cylindrical body of the present invention includes a step of molding a cylindrical body having a concave or convex portion formed on an end surface thereof by pouring a raw material resin into the centrifugal mold of the present invention and then performing demolding, and then demolding.
  • the amount of raw material resin injected matches the target inner diameter of the cylindrical body that is centrifugally molded along the inner peripheral surface of the mold body. Amount.
  • the convex portion or the concave portion formed by the concave portion or the convex portion exists concentrically.
  • the distance between the concentric circle formed by the formed convex portion or concave portion and the circular shape formed by the inner diameter of the cylindrical body is constant.
  • it can be instantaneously determined visually that the interval between the concentric circle formed by the formed convex part or concave part and the circular shape formed by the inner diameter of the cylindrical body is within the allowable range (tolerance) of the regular product. .
  • the tolerance range can be set according to the size and application of the target cylinder.
  • the centrifugal mold is eccentric and the cylinder is not centrifugally molded into a regular shape, the distance from the circular shape formed by the inner diameter of the cylindrical body is non-uniform, or the formed convex or concave portions are non-uniform. It will chip or disappear.
  • the distance between the concentric circle formed by the formed convexity or concave portion and the circular shape formed by the inner diameter of the cylindrical body is too large outside the allowable range (tolerance) of the regular product. It is possible to confirm whether the cylindrical body is in a regular shape by confirming that the concentric circle formed by the convex part or the concave part is broken or unevenly formed. it can. That is, the concave portion or the convex portion provided on the inner surface of the closing member is for confirming the position and inner diameter accuracy of the hollow portion of the cylindrical body. According to this, even if it does not cut
  • the present invention immediately after taking out the cylindrical molded body from the centrifugal mold, it is possible to easily detect equipment troubles in the centrifugal molding rotating device (for example, the rotating pin is worn out, the rotating shaft is shifted). Thereby, the production efficiency can be effectively improved, and in particular, when the centrifugal molding and rotating apparatus is automated, the production efficiency can be dramatically improved.
  • the convex portion or the concave portion is preferably provided so as to be formed in the vicinity of the inner peripheral edge of the cylindrical body. According to this, when the end surface of the cylindrical body is visually observed, the uniformity of the interval between the convex portion or the concave portion and the inner peripheral edge can be easily discriminated instantaneously. You can immediately notice whether the accuracy is within the tolerance (tolerance) of the regular product. Therefore, it is preferable that the convex part or the concave part touches the inner peripheral edge. When the convex portion or the concave portion does not touch the inner peripheral edge, the shortest length from the inner peripheral edge of the convex portion or the concave portion is, for example, 0 to 6.0 (mm), and further, 0 to 2.5 ( mm).
  • a convex part or the concave portion is in contact with the inner peripheral edge.
  • a convex part is provided in a cylindrical body end surface, and a recessed part is provided in the closure member inner surface of a centrifugal mold.
  • the cross-sectional ridge line of the convex part or the concave part of the closing member is constituted by a curve.
  • the inner periphery is concentric with the outer periphery of the cylinder, but when the diameter is smaller than the normal shape, the end surface has a convex or concave portion that is separated from the inner periphery, so the cylinder has a normal diameter. Can be easily confirmed.
  • the inner peripheral edge is concentric with the outer peripheral edge of the cylindrical body, when the diameter is larger than the normal shape, there is no convex or concave portion, so it is easy to make the cylindrical body larger than the normal diameter. Can be confirmed.
  • the resin material used in the present invention is not particularly limited, and various materials such as an anion-polymerizable polyamide such as polyamide obtained by a monomer casting method and a two-component curable urethane resin are applicable. Of these, anionic polymerizable polyamides are preferably used for reasons such as mechanical strength.
  • the cylindrical body formed by the method of the present invention is suitable for producing a resin gear using this.
  • a cylindrical body for manufacturing a resin gear is required to have extremely high inner diameter accuracy.
  • the cylindrical body is cut into a ring shape in a predetermined thickness to obtain a ring body.
  • a metal hub is fitted into the inner hole of the ring body, and the outer periphery of the ring body is cut to form teeth.
  • the manufactured resin gear Since the inner hole of this ring body is concentric (coaxial) having the desired inner diameter with the outer periphery of the ring body, the manufactured resin gear has very good shape accuracy.
  • FIG. 1A is a cross-sectional view of a centrifugal mold according to an embodiment, and shows a cross section along the axial direction on one end side in the axial direction of the centrifugal mold.
  • FIG. 1B is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using the centrifugal mold of FIG. 1A.
  • FIG. 1c is a cross-sectional view taken along the line Ic-Ic of FIG. 1b.
  • FIG. 1d is a view taken along the arrow Id in FIG. 1c.
  • FIG. 2a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment.
  • 2b is a sectional view taken along line IIb-IIb of FIG. 2a.
  • FIG. 3A is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment.
  • 3b is a sectional view taken along line IIIb-IIIb of FIG. 3a.
  • FIG. 4A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment, and FIG.
  • FIG. 4B is a view taken along arrow IVb in FIG. 4A.
  • FIG. 5a is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment
  • FIG. 5b is a view taken along the arrow Vb in FIG. 5a.
  • 6a is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment
  • FIG. 6b is a view taken along the arrow VIb in FIG. 6a.
  • FIG. 7A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal forming method using a centrifugal mold according to another embodiment
  • FIG. 7B is a view taken along the arrow VIIb in FIG. 7A
  • FIG. 8A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment
  • FIG. 8B is a view taken along the arrow VIIIb in FIG. 8A
  • 9A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment
  • FIG. 9A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment
  • FIG. 9A is a cross-sectional
  • FIG. 9B is a view taken along the arrow IXb in FIG. 9A.
  • FIG. 10A is an end view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment.
  • 10b is a cross-sectional view taken along line Xb-Xb of FIG. 10a.
  • FIG. 10c is an end view of a cylindrical body molded with a small amount of resin injection
  • FIG. 10d is a cross-sectional view taken along line Xd-Xd in FIG. 10c.
  • FIG. 11 a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment.
  • FIG. 11b is a cross-sectional view taken along the line XIb-XIb of FIG. 11a.
  • FIG. 12 a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment.
  • 12b is a cross-sectional view taken along line XIIb-XIIb of FIG. 12a.
  • FIG. 13 a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment.
  • 13b is a cross-sectional view taken along line XIIIb-XIIIb of FIG. 13a.
  • FIG. 17a is a cross-sectional view of a molded body centrifugally molded using the centrifugal mold of FIG. 15, and FIG. 17b is an enlarged view of a portion XVIIb of FIG. 17a.
  • FIG. 17a is a cross-sectional view of a molded body centrifugally molded using the centrifugal mold of FIG. 15
  • FIG. 17b is an enlarged view of a portion XVIIb of FIG. 17a.
  • FIG. 17a is a cross-sectional view of a molded body centrifugally molded using the centrifugal mold of FIG. 15
  • FIG. 17b is an enlarged view of a portion XVIIb of FIG. 17a.
  • FIG. 19A is a cross-sectional view of a cylindrical body formed by the centrifugal mold of FIG. 8, and shows a cross section along the axial direction on one end side in the axial direction of the cylindrical body.
  • FIG. 19b is an enlarged view of the XIXb portion of FIG. 19a.
  • FIG. 20a is a cross-sectional view of a centrifugal mold according to another embodiment, and shows a cross section along the axial direction on one end side in the axial direction of the centrifugal mold.
  • 20b is a cross-sectional view of a part of a hollow molded body that is centrifugally molded using the centrifugal mold of FIG. 20a. It is sectional drawing of the centrifugal mold which concerns on another embodiment.
  • FIG. 23a is a sectional view of one end side of a centrifugal mold according to a conventional example.
  • FIG. 23b is a perspective view of one end side in the axial direction of the cylindrical body formed by the centrifugal molding method using the centrifugal mold of FIG. 23a. It is a bottom view of the sealing plate of the centrifugal mold of FIG. It is sectional drawing of the centrifugal mold which concerns on another embodiment. It is a bottom view of the sealing plate of the centrifugal mold of FIG.
  • FIG. 1a to 1d show a first embodiment
  • FIG. 1a shows one end side of a centrifugal mold 10A
  • FIGS. 1b to 1d show a cylindrical body 1A centrifugally molded using this centrifugal mold 10A. Is shown.
  • FIG. 24 is a bottom view of the sealing plate 32A of the centrifugal mold 10A.
  • a plurality of concave portions 32a are provided at intervals along the planned formation position of the inner peripheral edge 1i of the cylindrical body 1A in the centrifugal mold inner surface of the seal plate 32A.
  • the recess 32a is hemispherical in this embodiment.
  • Other configurations of the centrifugal mold 10A are the same as those of the centrifugal mold 10 of FIG. 23 except that the lock mechanism is omitted, and the same portions are denoted by the same reference numerals. Although eight recesses 32a are provided, the present invention is not limited to this.
  • the injection amount of the raw material resin is such that the inner peripheral edge 1i of the end surface 1a of the cylindrical body 1A that is centrifugally molded along the inner peripheral surface of the mold body 11 is the recess 32a. It is set as the quantity which agree
  • the centrifugally formed cylindrical body 1A has the convex portion 2 formed by the concave portion 32a along the inner peripheral edge 1i of the end surface 1a.
  • the convex part 2 is a quarter hemisphere obtained by cleaving the hemisphere into two in the diameter direction, and the cleaved part is along the inner peripheral edge 1i of the cylindrical body 1A.
  • a predetermined number (eight in FIG. 1b) of convex portions 2 are provided along the inner peripheral edge 1i. Convex part 2 exists.
  • the inner peripheral edge 1i is concentric with the outer peripheral edge of the cylindrical body 1A, when the diameter is smaller than the regular shape, all the convex portions 2 are separated from the inner peripheral edge 1i, so that the cylindrical body 1A It can be confirmed that is not a regular shape or a regular inner diameter.
  • the inner peripheral edge 1i is concentric with the outer peripheral edge of the cylindrical body 1A, when the diameter is larger than the normal shape, all the convex portions 2 do not exist, so the cylindrical body 1A has a normal shape or a normal inner diameter. You can be sure that it is not.
  • the cylindrical body 1A is not in the normal shape or the normal inner diameter. I can confirm that.
  • a hemispherical recess 32a is provided in the sealing plate 32 of the centrifugal mold 10A, and approximately half of the recess 32a is filled with the raw resin so that the formed protrusion 2 is divided into four parts. It is hemispherical.
  • the shape of the recess 32a may be a semi-elliptical sphere, a cylinder, a prism, or the like. Note that it is preferable that the concave portion has a shape that expands toward the inlet side, such as a hemispherical shape or a semi-elliptical spherical shape, because demolding is easy.
  • FIGS. 2a to 2c show a cylindrical body 1B in which the convex portions 2B are hemispherical.
  • the number of convex parts 2B is not limited to the figure.
  • the convex portion 2B is disposed along the inner peripheral edge 1i.
  • the other configurations of FIGS. 2a to 2c are the same as those of FIGS. 1b to 1d.
  • FIGS. 3a to 3c show a cylindrical body 1C in which the convex portion 2C is cut out from a part of the hemisphere (about 1/4 in FIGS. 3a to 3c).
  • the convex part 2C is arranged so that the notched part is along the inner peripheral edge 1i of the cylindrical body 1C.
  • the number of the convex portions 2C is not limited to the illustration.
  • Other configurations of FIGS. 3a to 3c are the same as those of FIGS. 1b to 1d.
  • FIG. 4a and 4b show a cylindrical body 1D in which the convex portion 2D is a quadrant ellipsoid.
  • the convex portion 2D is arranged so that the major axis direction of the ellipse is the radial direction of the cylindrical body 1D and the minor axis direction of the ellipse is along the inner peripheral edge 1i of the cylindrical body 1D.
  • the other structure of FIG. 4a, 4b is the same as that of FIG. 1b, 1c.
  • FIG. 5a and 5b show a cylindrical body 1E having a convex portion 2E having a shape obtained by cutting out a part of a semi-elliptical sphere.
  • the convex portion 2E is arranged so that the major axis direction of the ellipse is the radial direction of the cylindrical body 1E, and the notch surface is along the inner peripheral edge 1i of the cylindrical body 1E.
  • the other structure of FIG. 5a, 5b is the same as that of FIG. 1b, 1c.
  • FIG. 6a and 6b show a cylindrical body 1F having a convex portion 2F having a shape obtained by cutting out a part of a quadrangular pyramid.
  • the quadrangular pyramid has a long diagonal line and a short diagonal line.
  • the quadrangular pyramid has a rhombus shape in plan view (as seen in FIG. 6b, the front face of the end face 1a), and is cut out at one end in the long diagonal direction. It has a shape.
  • the convex portion 2F is arranged so that the long diagonal direction is the radial direction of the cylindrical body 1F and the notched portion is along the inner peripheral edge 1i of the cylindrical body 1F.
  • the other structure of FIG. 6a, 6b is the same as that of FIG. 1b, 1c.
  • FIG. 7a and 7b show a cylindrical body 1G having a semiconical convex portion 2G.
  • the convex part 2G has a shape in which the cone is cut in half in the radial direction.
  • the convex portion 2G is arranged so that the cleaved portion follows the inner peripheral edge 1i of the cylindrical body 1G.
  • the other structure of FIG. 7a, 7b is the same as that of FIG. 1b, 1c.
  • FIG. 8a and 8b show a cylindrical body 1H having a semi-cylindrical convex portion 2H.
  • the convex portion 2H has a shape in which a cylinder is cut in half in the radial direction.
  • the convex portion 2H is arranged so that the cleaved portion follows the inner peripheral edge 1i of the cylindrical body 1H.
  • the other structure of FIG. 8a, 8b is the same as that of FIG. 1b, 1c.
  • FIGS. 9a and 9b show a cylindrical body 1I having a convex portion 2I having a substantially teardrop shape in plan view.
  • the convex portion 2I has a shape in plan view in which one end side is curved and the other end side is elongated in a streamline toward the end portion, and the one end side is cleaved in a direction orthogonal to the longitudinal direction.
  • the convex portion 2I is arranged such that the cleaved portion is along the inner peripheral edge 1i of the cylindrical body 1I.
  • the other configurations of FIGS. 9a and 9b are the same as those of FIGS. 1b and 1c.
  • the convex portion is disposed along the inner peripheral edge of the cylindrical body, but a convex portion may be provided in addition to the inner peripheral edge.
  • FIGS. 10a and 10b show a cylindrical body 1J according to the example.
  • the convex part 2 is provided in the inner periphery of the end surface 1a of the cylindrical body 1J shape
  • the convex portion 2 has the same shape as that shown in FIGS. 1b to 1d.
  • a plurality of convex portions 2J are provided at equal intervals in the circumferential direction between the inner peripheral edge and the outer peripheral edge of the end surface 1a of the cylindrical body 1J.
  • Each convex portion 2J is located at an equal radius with respect to the axial center of the cylindrical body 1J.
  • FIG. 10c and 10d show a cylindrical body 1J ′ formed by using the same centrifugal mold 10A ′ with a smaller amount of resin injection than in the case of FIGS. 10a and 10b.
  • FIG. 10 and 10d are sectional views taken along line Xd-Xd in FIG. 10c.
  • This cylindrical body 1J ′ has only a plurality of convex portions 2J on its end face.
  • FIG. 25 is a sectional view of a centrifugal mold 10A ′ for molding the cylindrical bodies 1J and 1J ′
  • FIG. 26 is a bottom view of the seal plate 32.
  • the convex portion 2J is formed by the concave portion 32a ′.
  • the other configuration of the centrifugal mold 10A ′ is the same as that of the centrifugal mold 10A, and the same reference numerals indicate the same parts.
  • the cylindrical body 1J shown in FIGS. 10a and 10b By comparing the cylindrical body 1J shown in FIGS. 10a and 10b with the cylindrical body 1J ′ shown in FIGS. 10c and 10d, it can be easily determined whether or not the formed cylindrical body has a regular shape. For example, when the cylindrical body 1J shown in FIGS. 10a and 10b has a regular shape, the cylindrical body 1J ′ shown in FIGS. 10c and 10d does not include the convex portion 2, so that it is determined as a defective product out of the tolerance range. Is done. Furthermore, even if the cylindrical body 1J is centrifugally molded into a regular shape, the convex portions 2 have a regular shape, or there is a regular number, or how far the convex portion 2 is from the inner periphery. It is possible to easily determine how much error has occurred by visually confirming whether the error has occurred.
  • the cylindrical body 1J ′ shown in FIGS. 10c and 10d has a regular shape
  • the cylindrical body 1J shown in FIGS. 10a and 10b has a convex portion 2 and thus is out of the tolerance range. It is immediately judged that the product is non-defective. Furthermore, even for the cylindrical body 1J ′ that does not have the convex portion 2, the distance between the convex portion 2J and the inner peripheral edge 1i is confirmed, or the shape and number of the convex portions 2J are visually confirmed. Therefore, it can be easily determined how much error has occurred.
  • the cylindrical body that has been centrifugally molded using the centrifugal mold of the present invention is within a tolerance range. Furthermore, if the outer diameter of the cylindrical body is the same, even if the inner diameter of the target cylindrical body is different, it is possible to manufacture with the same mold by changing the range of resin injection amount and tolerance. it can.
  • the shape of the convex portions 2 and 2J may be any of the convex portions of FIGS. 1 to 9, or may be other than these.
  • the protrusions 2 and 2A to 2J are independent protrusions.
  • the protrusions formed on the concentric circles are not necessarily one shape, and may be two or more shapes.
  • the convex portion 2a is continuous over the entire circumference of the inner peripheral edge 1i, but may be interrupted at one or more points in the middle. Further, the curve continuous over the entire circumference of the inner peripheral edge 1i may be uneven.
  • the protrusion 2a is formed of a protrusion along the inner periphery 1i, and the protrusion 2a provided between the inner periphery 1i and the outer periphery is formed of a concentric protrusion.
  • You may provide convex part 2a '.
  • Other ridges may be provided so as to form triple or more concentric circles.
  • the cylindrical bodies 1A to 1L of FIGS. 1a to 12b convex portions are formed, but by providing convex portions (not shown) instead of the concave portions 32a on the sealing plate 32A of the centrifugal mold, the cylindrical body of FIG.
  • the recess 5 may be provided along the inner peripheral edge 1i of the end face 1a as in 1M. Also in this case, when the inner peripheral edge 1i is decentered or has a larger or smaller diameter than the regular shape, at least a part of the recess 5 does not exist or is separated from the inner peripheral edge 1i. It can be confirmed that the body 1M does not have a regular shape.
  • the concave portion 5 has an independent concave hole shape, but may be a concave strip extending along the inner peripheral edge 1i.
  • the concave stripe may circulate around the entire circumference of the inner peripheral edge 1i, or may be interrupted at one or more points in the middle. You may provide a recessed part in double or multiple concentric form like the protruding item
  • FIG. 14 shows a centrifugal mold 10A ′ in which a concave portion 32a is provided in the seal plate 32 ′ in the centrifugal mold 10 of FIG.
  • Other configurations of the centrifugal mold 10A ' are the same as those of the centrifugal mold 10A shown in FIG. 23, and the same reference numerals denote the same parts.
  • the end surfaces 1a of the cylindrical bodies 1A to 1M formed by centrifugation are perpendicular to the axial direction of the cylindrical bodies 1A to 1M.
  • the tapered surface 1a may be inclined such that the inner peripheral edge 1i side is closer to the center in the longitudinal direction of the cylindrical body.
  • FIG. 15 shows a centrifugal mold 10B for molding a cylindrical body 1N having such a tapered end face 1a.
  • the seal plate 32 ⁇ / b> C is provided on the inner surface of the lid 12 so as to cover the tubular portion opening 31 of the mold body 11.
  • the seal plate 32C is supported by three guide bolts 33 penetrating the lid 12 so as to be movable in the axial direction of the mold, and in the direction of the tubular portion opening 31 by a pressure contact spring 34 sheathed on the guide bolt 33. It is energized towards.
  • the pressure spring 34 holds the seal plate 32 ⁇ / b> C with a strong force on the mold body 11. Press against the end face. Thereby, the tubular portion opening 31 is reliably sealed, and at the same time, the locking state between the locking portion 26 and the flange 13 is held together with the lock spring 25.
  • a disc-shaped packing 41 for sealing the end surface of the tubular portion opening 31 is provided on the inner surface of the sealing plate 32C, and a disc shape having an outer diameter corresponding to the diameter of the tubular portion opening 31 is provided on the inner surface side of the packing 41.
  • the metal inner lid 42 is provided.
  • the packing 41 is provided so as to cover the entire inner surface of the seal plate 32C.
  • a silicon-based packing material 41a having an appropriate cushioning property is disposed on the seal plate 32C side, and a fluororesin-based packing material 41b having an excellent heat resistance is disposed on the mold body 11 side, thereby providing a sufficient seal. Sufficient heat resistance can be obtained while obtaining properties.
  • the metal inner lid 42 has a substantially disc shape that is inserted into the end of the tubular portion of the mold body 11 and has a conical surface whose center projects in the mold inner direction.
  • the metal inner lid 42 is fixed by a bolt 43 penetrating the center of the seal plate 32C so that the packing 41 is sandwiched between the inner surface of the seal plate 32C.
  • the inner lid 42 has a plurality of recesses 42a. Each recess 42a is located at an equal radius with respect to the central axis of the inner lid 42 (scheduled formation position of the inner peripheral edge 1i). That is, the distance from each recessed part 42a to the inner peripheral surface of the mold main body 11 is equal.
  • the raw material resin is injected in an amount such that the inner peripheral surface of the centrifugally molded cylindrical body matches the edge of the recess 42a (the edge on the center side of the inner lid 42).
  • FIG. 16 shows a state in which the raw material resin R is injected into the centrifugal mold 10B, and the centrifugal mold 10C is rotated around its axis to perform centrifugal molding.
  • FIG. A cylindrical body 1N immediately after being removed from the mold 10C is shown.
  • FIG. 17b is an enlarged view of the XVIIb portion of FIG. 17a. As shown in FIGS. 17a and 17b, the end surface 1a of the cylindrical body 1N is tapered.
  • the burr 1b If the burr 1b is removed from the molded product, ie, the cylindrical body 1N, the burr 1b does not remain in the centrifugal mold. However, in the centrifugal mold 10B of FIG. 15, since the outer peripheral edge of the conical inner lid 42 is positioned in the immediate vicinity of the inner peripheral surface of the mold body 11, as clearly shown in FIG. 17b, the end surface of the cylindrical body 1N The outer peripheral edge where 1a and the outer peripheral surface 1c intersect has an acute angle with a cross-sectional shape of less than 90 °. Therefore, in this cylindrical body 1N, the root portion of the burr 1b, that is, the connecting portion between the burr 1b and the cylindrical body 1N is thin, and the burr 1b is easily separated from the root. If the burr 1b is cut off from the root at the time of mold removal, the burr 1b may remain in the centrifugal mold 10B and cause a defective product in the next centrifugal molding process.
  • the bonding strength between the burr and the cylindrical body is high, and the burr is formed into a cylindrical body when the cylindrical body is removed.
  • a centrifugal mold that is taken out from the centrifugal mold and a method for manufacturing a cylindrical body using the centrifugal mold are also provided.
  • the centrifugal mold is a centrifugal mold having a tubular mold body for centrifugally molding a cylindrical body, and a closing member that closes an opening of the mold body.
  • a conical or frustoconical inner lid is provided on the inner surface of the closing member facing inward of the mold, and projects inward from the centrifugal mold and decreases in diameter toward the inner side of the centrifugal mold.
  • the peripheral edge is separated from the inner peripheral surface of the mold main body by a predetermined distance L, and the outer peripheral side of the inner lid is a surface perpendicular to the axial center line direction of the centrifugal mold.
  • a cylindrical body formed by such a centrifugal mold has a peripheral surface perpendicular to the axial direction of the cylindrical body, like a cylindrical body 1P in FIGS. 19a, 19b, and 20b described later. Therefore, the thickness of the root portion of the burr formed on the outer peripheral edge of the end face of the cylindrical body is larger than the cylindrical body 1N of FIGS. 17a and 17b, and the bonding strength between the burr and the main body portion of the cylindrical body is high. Become.
  • the burr when removing the cylindrical body from the centrifugal mold, the burr is prevented from being separated from the root, and the burr is removed from the cylindrical body integrally. As a result, burrs are prevented from remaining in the centrifugal mold, and defective products are prevented from occurring in the cylindrical body molded in the subsequent molding cycles.
  • FIG. 18 shows a centrifugal mold 10D according to such an embodiment
  • FIGS. 19a and 19b show a cylindrical body 1P that is centrifugally molded using this centrifugal mold 10D.
  • the inner lid 42A has a conical shape with a smaller diameter than the inner lid 42 of the centrifugal mold 10B of FIG. 15, and the outer peripheral edge of the inner lid 42A is the inner periphery of the mold body 11. It is separated from the peripheral surface by a predetermined distance L.
  • the other configuration of the centrifugal mold 10D is the same as that of the centrifugal mold 10C of FIG. 15, and the same portions are denoted by the same reference numerals.
  • the amount of raw material resin injected is such that the inner peripheral edge 1i of the cylindrical body 1P that is centrifugally molded along the inner peripheral surface of the mold body 11 is within the recess 42a.
  • the amount matches the edge on the lid center side.
  • the end surface 1a of the cylindrical body 1P is formed by contacting the tapered surface 1d formed by contacting the inner lid 42A and the packing 41 (fluororesin-based packing material 41b) in the range L.
  • the vertical surface 1e is perpendicular to the axial direction of the body 1P.
  • Width t 2 of the vertical plane 1e in the radial direction of the cylindrical body 1P is a value that matches the above distance L.
  • the inclination angle ⁇ of the taper surface 1d with respect to the vertical surface 1e is preferably about 10 to 50 °, particularly about 15 to 40 °. It is also preferable to change the angle between the rising portion and the central portion.
  • the width t 2 that is, the distance L of the vertical surface 1 e depends on the thickness T of the cylindrical body 1 E, but is preferably 0.5 mm or more and 50 mm or less, 0.8 mm or more and particularly 2.0 mm or less. If t 2 is small, the thickness of the vicinity of the base of the burr 1b is not sufficiently large. If t 2 is excessively large, relatively t 1 decreases, the effect of providing the conical inner lid 42A becomes lower.
  • the burr 1b formed so as to project radially from the outer peripheral edge of the end surface 1a (the intersection angle edge between the end surface 1a and the outer peripheral surface 1c) has a root thickness. It becomes larger than the cylindrical body 1N of FIG. 17, and the connection strength between the burr 1b and the cylindrical body 1P increases. As a result, when removing the cylindrical body 1P, the burr 1b is removed from the base portion of the cylindrical body 1P without being divided near the root. This prevents the burr 1b from remaining in the centrifugal mold 10D and prevents the generation of defective products.
  • the sealing plate 32, the packing 41, the inner lid 42A, and the lid 12 constitute a closing member.
  • the inner lid 42A has a conical shape
  • the inner surface of the inner lid 42A (the surface facing the inside of the centrifugal mold 10D) is a conical surface as a whole, but like the centrifugal mold 50 shown in FIG.
  • the inner lid 70 attached to the inner surface side of the seal plate 60 may have a truncated cone shape. That is, the surface of the inner lid 70 facing the inside of the centrifugal mold 50 has a tapered surface 71 in the vicinity of the outer peripheral edge, and a plane 72 perpendicular to the axial center line direction of the centrifugal mold 50 on the center side thereof. It has become.
  • the outer peripheral edge of the inner lid 70 is separated from the inner peripheral surface of the mold body 51 by a distance L.
  • a plurality of recesses 75 are provided in the plane 72. Each recess 75 is located at an equal radius with respect to the central axis of the inner lid 70.
  • An opening 61 is provided in the central portion of the seal plate 60, and a convex portion 73 protruding from the inner lid 70 is fitted in the opening 61.
  • the inner lid 70 is fixed to the sealing plate 60 by bolts (not shown) that pass through the sealing plate 60 and screwed into the inner lid 70, but the fixing method of the inner lid 70 is not limited to this.
  • the packing 80 interposed between the seal plate 60 and the inner lid 70 is formed by laminating a silicon-based packing material 81 that overlaps the seal plate 60 and a fluororesin-based packing material 82 that overlaps the inner lid 70. Yes.
  • a flange 53 is provided at the end of the mold body 51 of the centrifugal mold 50.
  • the seal plate 60 overlaps the end surface of the mold body 51 via the packing 80.
  • a lid for fixing the seal plate 60 to the mold body 51 is provided.
  • this lid one having the same configuration as the lid 12 can be used.
  • the sealing plate 60, the inner lid 70, the packing 80, and the lid constitute a closing member.
  • the cylindrical body 3 shown in FIG. 20b is molded.
  • the injection amount of the raw material resin is such that the end surface 3a of the cylindrical body 3 that is centrifugally molded along the inner peripheral surface of the mold body 51 is in contact with the outer peripheral side of the tapered surface 71 and the flat surface 72, and the inner peripheral edge 3i is the recess 75.
  • the amount matches the edge on the center side.
  • the end surface 3 a of the cylindrical body 3 is formed by contacting the flat surface 72, the vertical surface 3 f perpendicular to the axial direction of the molded body 3, and the tapered surface 3 d formed by contacting the tapered surface 37.
  • a vertical surface 3e that is formed by coming into contact with the packing 80 (fluororesin-based packing material 82) in the L range and is perpendicular to the axial direction of the molded body 3.
  • Preferred range of the radial width t 3 of the vertical surface 3e is similar to t 2 of FIG 19b.
  • a convex portion 3g exists along the inner peripheral edge 3i.
  • the thickness near the root of the burr 3b protruding from the outer periphery of the intersection between the end surface 3a and the outer peripheral surface 3c increases. Thereby, it is prevented that the burr 3b is divided at the time of demolding, and generation of defective products is prevented. Moreover, the shape inspection of the cylindrical body 3 can be easily performed by the convex portion 3g.
  • the lid 12 and the sealing plates 32 and 60 are provided as the closing member, but the lid may be omitted and the closing member may be constituted only by the sealing plate.
  • the preferable size of the convex portions 2, 2A to 2J, 2a, 2a ', 2b, 3g and the concave portion 5 is preferably determined based on the tolerance of the inner diameter.
  • the convex part or the concave part is an independent shape, it is easy to recognize that it is concentric if it is 3 points or more, and if it is within 32 points, it is preferable because it is easy to suppress the occurrence of burrs. About 8 points are particularly suitable.
  • FIGS. 14 to 16 include the locking device 21 shown in FIG. 23, but the locking mechanism is not limited to this, and various types can be adopted.
  • An example of such a centrifugal mold with a lock mechanism is shown in FIGS.
  • the 21 has a tubular mold body 111 and a lid 112 for closing the opening of the mold body 111.
  • the lid 112 is provided with the concave portion or the convex portion. After injecting the raw material resin into the mold body 111 and mounting the lid 112, a cylindrical molded product along the inner peripheral surface of the mold body 111 is formed by rotating at high speed around the mold axis. .
  • the lid 112 is provided so as to follow a disc-shaped lid plate 113 that closes the opening end surface of the mold main body 111 and from the outer periphery of the lid plate 113 to the outer peripheral surface of the mold main body 111 with a predetermined interval. And a cylindrical side tube portion 114.
  • the lock device 121 for fixing the lid 112 to the mold body 111 includes a lock claw support portion 122 provided at a plurality of locations, for example, 3 to 4 locations at equal intervals on the side cylinder portion 114 of the lid 112, and each lock claw. It has a lock claw 123 attached to each support portion 122, a spring 124 that urges the lock claw 123 in the lock position direction, and a lock release ring 125 provided at the tip of the side tube portion 114.
  • the lock claw support portion 122 supports a pin hole for attaching a pin (support shaft) 126 for pivotally supporting the lock claw 123, a spring accommodating portion 127 for mounting the spring 124, and the lock release ring 125. And an internal thread portion to which the bolt 128 is attached. Since the female thread portion to which the bolt 128 is attached supports the unlocking ring 125 provided over the entire circumference of the side tube portion 114, the position of the side tube portion 114 is arbitrary regardless of the position of the lock claw support portion 122. Can be provided.
  • the unlocking ring 125 includes an unlocking piece 131 inserted between the outer peripheral surface of the mold body and the inner peripheral surface of the side cylinder portion, an attachment piece 132 in a state along the outer peripheral surface of the side cylinder portion, and the attachment pieces 131 and 132. It has a U-shaped cross section composed of connecting pieces 133 to be connected.
  • the mounting piece 132 is provided with a long hole 134 having a long axis in the mold axial direction so as to correspond to the mounting position of the bolt 128.
  • the lock release ring 125 is attached to the tip of the side cylinder portion 114 in a movable state with respect to the mold axial direction by the bolt 128 inserted through the long hole 134.
  • the lock claw 123 has a base end portion supported by the pin 126 and is in a rotatable state.
  • the rotation end (inner end) protrudes from the inner peripheral surface of the side tube portion toward the mold main body, and is a mold. It is in a state where it can contact the outer peripheral surface of the main body.
  • the lock claw 123 is urged in the projecting direction by the spring 124, and in a state where the lid 112 is not attached to the mold body 111, the lock claw 123 reaches a position where it comes into contact with the tip of the lock release piece 131 in the lock release ring 125. It is held in a rotated state.
  • the lock release ring 125 is pressed to a position (on the side opposite to the cover plate) away from the end of the side tube by the lock claw 123 biased by the spring 124, and the lock claw 123 at this time
  • the rotating end is in a state of protruding to the inner peripheral side from a position corresponding to the outer peripheral surface of the mold main body 111.
  • the lock device 121 formed in this way is configured to reduce the biasing force of the spring 124 when the rotation end of the lock claw 123 contacts the outer peripheral surface of the mold body 111 when the lid 112 is mounted on the mold body 111. Accordingly, the lock claw 123 is pushed back to the cover plate 113 side.
  • the lock claw 123 is rotated at the end of the mold by the urging force of the spring 124.
  • the main body 111 is held in contact with the outer peripheral surface.
  • the position where the rotation end of the lock claw 123 abuts on the outer peripheral surface of the mold body 111 is the size of each part so that the position is closer to the opening side (the cover plate 113 side) than the pin 126.
  • the positional relationship is set.
  • the lock claw 123 that rotates about the pin 126 is in a locked state in which it is wedged between the mold main body and the side tube portion due to the positional relationship between the pin 126 and the rotation end contact portion. . Therefore, the movement of the lid 112 in the opening direction is prevented, and the lid 112 is held in a state where the opening of the mold body 111 is closed. That is, the lid 112 is automatically held in a closed state only by being assembled in the axial direction with respect to the mold body 111.
  • the lock release ring 125 When the lid 112 is removed from the mold body 111 after molding, the lock release ring 125 is moved to the lid plate 113 side, and the lock claw 123 is pivoted to the lid plate side by the lock release piece 131, thereby turning the rotation end. And the outer peripheral surface of the mold body 111, that is, the locked state by the lock claw 123 can be released.
  • the lid 212 is provided with the concave portion or the convex portion. ing. After injecting the raw material resin into the mold main body 211 and attaching the lid 212, a cylindrical molded product along the inner peripheral surface of the mold main body 211 is obtained by rotating at high speed around the mold axis. is there.
  • the lock device 221 for fixing the lid 212 to the mold body 211 includes a lock claw support portion 222 provided at three equal intervals on the outer periphery of the lid 212 and a lock claw attached to each lock claw support portion 222. 223.
  • the lock claw support portion 222 has a pair of support pieces 224 that sandwich the lock claw 223.
  • Each support piece 224 is formed by cutting the outer periphery of the lid 212, and the upper surface 222a of the lock claw support portion 222 is inclined so that the outer periphery side of the lid is lowered.
  • the support piece 224 is provided with a pin hole 227 for attaching a pin 225 for supporting the lock claw 223.
  • the lock claw 223 has a locking portion 226 that locks on a flange 213 provided in the mold main body 211 at the front end portion, and a male screw portion for nut screwing at the rear end portion.
  • the lock claw 223 can be moved in the mold axial direction by being pivotally supported by the support piece 224 with the pin 225 inserted through a long hole 227 in the claw longitudinal direction provided in an intermediate portion. It can be tilted in the linear direction.
  • the coil spring 230 When the lock claw 223 is attached to the lid 212, the coil spring 230 is attached in a compressed state via a washer 229 between the nut 228 screwed into the male screw portion at the rear end and the lock claw support portion 222. is doing. The coil spring 230 is pressed against the upper surface 222a of the lock claw support portion 222, that is, the coil spring abutting surface, with the outer peripheral side displaced in the direction of the claw tip. The amount of side deflection increases.
  • the lock device 221 formed in this manner is in a state where the locking portion 226 of the lock claw 223 is securely locked to the flange 213 by the action of the coil spring 230 when the lid 212 is mounted on the mold body 211. At the same time, the lid 212 is pressed against the opening of the mold body 211. At this time, the lid 212 can be brought into close contact with the mold body 211 with a necessary and sufficient pressing force by appropriately selecting the performance of the coil spring 230. Further, the pressing force by the coil spring 230 can be finely adjusted by changing the screwing amount of the nut 228 to the lock claw 223.
  • the lock device 221 can be unlocked by tilting the rear end of the lock claw 223 toward the inner periphery of the lid.
  • the tilting operation of the lock claw 223 can be easily performed by pressing a lock release jig (not shown) having a conical taper surface with the lid side widened on the inner periphery in the mold axial direction. Further, by forming the tapered surface of the unlocking jig into a conical surface having the maximum diameter corresponding to the lid 212, the three lock claws 223 can be tilted at the same time regardless of these positions. .
  • the unlocking jig having such a conical surface and the jig for gripping the lid 212 the attachment / detachment of the lid 212 with respect to the mold body 211 and the opening / closing operation of the locking device 221 are automatically performed. Can be done.
  • the inner hole of the cylindrical body does not have to be completely coaxial with the outer peripheral surface of the cylindrical body, and may be slightly decentered.
  • the above embodiment is an example of the present invention, and the present invention may have a configuration other than the above.
  • surface treatment such as plating (for example, chromium plating) or plasma treatment may be performed on the inner surface of the formed cylindrical body.
  • a layered structure may be formed by forming a layer of silicon-based material or fluorine-based material on the inner surface of the cylindrical body.

Abstract

Provided are: a centrifugal forming mold in which shape defects on the inner peripheral edge of a cylindrical body end surface can be found easily; and a method for manufacturing a cylindrical body using the centrifugal forming mold. This centrifugal forming mold 10A has a tubular mold main body 11 for forming a cylindrical body 1A by centrifugal forming, and a seal plate 32 that closes an opening of the mold main body 11, wherein recess parts 32a, for forming protruding parts 2 along an inner peripheral edge 1i of the cylindrical body 1A that has been formed, are provided on the inner surface of the seal plate 32 at equal radial positions with respect to the center of the seal plate 32. A resin R is injected into the centrifugal forming mold 10A to form the cylindrical body 1A by centrifugal forming.

Description

遠心成形型及び円筒体の製造方法Centrifugal mold and cylindrical body manufacturing method
　本発明は、遠心成形型に関し、詳しくは、円筒体を成形するための管状の金型本体と、該金型本体の両端開口に着脱可能に設けられる閉塞部材とを有する遠心成形型に関する。また、本発明は、この遠心成形型を用いた円筒体の製造方法に関する。 The present invention relates to a centrifugal mold, and more particularly, to a centrifugal mold having a tubular mold body for molding a cylindrical body and a closing member detachably provided at both ends of the mold body. The present invention also relates to a method of manufacturing a cylindrical body using this centrifugal mold.
　樹脂製円筒体を成形する方法として、管状の金型本体と、該金型本体の開口を閉塞する蓋とからなる遠心成形型内に原料樹脂を注入し、該金型を軸線を中心として回転させながら原料樹脂を硬化させる遠心成形法が知られている（例えば、特許文献１参照。）。 As a method of molding a resin cylindrical body, a raw material resin is injected into a centrifugal mold composed of a tubular mold body and a lid that closes the opening of the mold body, and the mold is rotated about an axis. There is known a centrifugal molding method in which a raw material resin is cured while being allowed to occur (see, for example, Patent Document 1).
　図２３ａは特許文献１に記載の遠心成形型を示す。この遠心成形型１０は、管状の金型本体１１と、該金型本体１１の両端開口を覆う一対の蓋１２とを有する。一方の蓋を金型本体に装着した状態で金型本体１１内に原料樹脂を注入し、他方の蓋を装着して金型本体の両端開口を閉塞する。次いで、金型軸線を中心として成形型１０を高速回転させることにより、金型本体１１の内周面に沿う筒状の成形品を得るものである。 FIG. 23 a shows the centrifugal mold described in Patent Document 1. The centrifugal mold 10 includes a tubular mold body 11 and a pair of lids 12 that cover both end openings of the mold body 11. With one lid attached to the mold body, the raw material resin is injected into the mold body 11, and the other lid is attached to close both ends of the mold body. Next, a cylindrical molded product along the inner peripheral surface of the mold body 11 is obtained by rotating the mold 10 at a high speed around the mold axis.
　蓋１２を金型本体１１に固定するためのロック装置２１は、蓋１２の外周３箇所に等間隔で設けられたロック爪支持部２２と、各ロック爪支持部にピン２３によってそれぞれ傾動可能に取り付けられたロック爪２４と、このロック爪２４をロック方向に付勢するためのロックスプリング２５とを有するものであって、ロック爪２４の先端部に設けた係止部２６を、金型本体１１の両端部に設けられているフランジ１３の外縁にそれぞれ係止させることにより、蓋１２を金型本体１１の開口を覆うような状態で固定できるようにしている。ロック爪２４の後端部は、蓋外面よりも突出した状態になっており、この突出部分を蓋内周方向に傾動させることにより、係止部２６とフランジ１３との係止状態、即ちロック状態を解除できる。 The lock device 21 for fixing the lid 12 to the mold body 11 can be tilted by a lock claw support portion 22 provided at three intervals on the outer periphery of the lid 12 at equal intervals, and a pin 23 on each lock claw support portion. It has a lock claw 24 attached and a lock spring 25 for urging the lock claw 24 in the lock direction, and a locking part 26 provided at the tip of the lock claw 24 is provided with a mold body. The lid 12 can be fixed in a state of covering the opening of the mold body 11 by engaging with the outer edges of the flanges 13 provided at both ends of the mold 11. The rear end portion of the lock claw 24 protrudes from the outer surface of the lid. By tilting the protruding portion in the inner circumferential direction of the lid, the locked state between the locking portion 26 and the flange 13, that is, the lock The state can be released.
　蓋１２の内面には、前記金型本体１１の管状部開口３１を覆うシール板３２が設けられている。このシール板３２は、蓋１２を貫通する３本のガイドボルト３３によって金型軸線方向に移動可能に支持されるとともに、このガイドボルト３３に外装した圧接スプリング３４によって前記管状部開口３１の方向に向けて付勢されている。シール板３２の外周側に設けたリング状の溝には、金型本体１１の端面に当接するリング状のシール材３５が設けられている。 A seal plate 32 is provided on the inner surface of the lid 12 to cover the tubular portion opening 31 of the mold body 11. The seal plate 32 is supported by three guide bolts 33 penetrating the lid 12 so as to be movable in the mold axial direction, and in the direction of the tubular portion opening 31 by a pressure contact spring 34 sheathed on the guide bolt 33. It is energized towards. A ring-shaped groove 35 provided on the outer peripheral side of the seal plate 32 is provided with a ring-shaped seal material 35 that contacts the end surface of the mold body 11.
　前記圧接スプリング３４は、蓋１２を金型本体１１に装着して前記ロック爪２４の係止部２６をフランジ１３に係止させた状態で、前記シール板３２を強い力で金型本体端面に押し付ける。これにより、管状部開口３１を確実にシールすると同時に、前記係止部２６とフランジ１３との係止状態を前記ロックスプリング２５と共に保持する。 In the state where the lid 12 is attached to the mold body 11 and the locking portion 26 of the lock claw 24 is locked to the flange 13, the pressure contact spring 34 pushes the seal plate 32 to the mold body end surface with a strong force. Press. Thereby, the tubular portion opening 31 is reliably sealed, and at the same time, the locking state between the locking portion 26 and the flange 13 is held together with the lock spring 25.
　この遠心成形型１０内に原料樹脂を注入し、遠形型１０をその軸心回りに回転させることにより、円筒体が遠心成形される。図２３ｂは、この遠心成形により成形され、成形型１０から脱型された円筒体１を示している。 The raw material resin is poured into the centrifugal mold 10 and the far mold 10 is rotated around its axis, whereby the cylindrical body is centrifugally molded. FIG. 23 b shows the cylindrical body 1 formed by this centrifugal molding and removed from the mold 10.
　円筒体を遠心成形する場合、遠心成形型の偏心などにより、円筒体１の端面１ａにおける内孔１ｈの内周縁１ｉが規定直径の円とならなかったり、内周縁１ｉが規定位置からずれたりすることがある。 When the cylindrical body is subjected to centrifugal molding, the inner peripheral edge 1i of the inner hole 1h in the end surface 1a of the cylindrical body 1 does not become a circle with a predetermined diameter or the inner peripheral edge 1i deviates from the predetermined position due to eccentricity of the centrifugal mold. Sometimes.
特開２００４－１４２１０９号公報JP 2004-142109 A
　本発明は、円筒体端面の内周縁の形状不正を容易に発見することができる遠心成形型及びそれを用いた円筒体の製造方法を提供することを目的とする。 An object of the present invention is to provide a centrifugal mold that can easily find the shape irregularity of the inner peripheral edge of the end face of a cylindrical body, and a method of manufacturing a cylindrical body using the same.
　本発明の遠心成形型は、円筒体を遠心成形するための管状の金型本体と、該金型本体の開口を閉塞する閉塞部材とを有する遠心成形型であって、該閉塞部材の遠心成形型内方を向く閉塞部材内面に、成形された円筒体の端面に凸部又は凹部を形成するための凹部又は凸部が同心円上に設けられていることを特徴とする。 The centrifugal mold of the present invention is a centrifugal mold having a tubular mold body for centrifugally molding a cylindrical body and a closing member for closing an opening of the mold body, and the centrifugal molding of the closing member A concave portion or a convex portion for forming a convex portion or a concave portion on the end surface of the molded cylindrical body is provided concentrically on the inner surface of the closing member facing the inside of the mold.
　本発明の一態様では、前記閉塞部材内面の凹部又は凸部が、円筒体の内周縁近傍に設けられている。 In one aspect of the present invention, the concave portion or the convex portion on the inner surface of the closing member is provided in the vicinity of the inner peripheral edge of the cylindrical body.
　本発明の一態様では、前記閉塞部材内面の凹部又は凸部が、円筒体の内周縁に沿って設けられている。 In one aspect of the present invention, the concave portion or the convex portion on the inner surface of the closing member is provided along the inner peripheral edge of the cylindrical body.
　本発明の一態様では、前記閉塞部材の凸部又は凹部の断面稜線が、曲線で構成される。 In one aspect of the present invention, the cross-sectional ridge line of the convex portion or the concave portion of the closing member is configured by a curve.
　本発明の一態様では、前記閉塞部材の凸部又は凹部は、円筒体の内径精度を検査するために設けられる。 In one aspect of the present invention, the convex portion or the concave portion of the blocking member is provided to inspect the inner diameter accuracy of the cylindrical body.
　本発明の一態様では、前記閉塞部材の凸部又は凹部は、周方向に間隔をおいて複数個設けられている。 In one aspect of the present invention, a plurality of convex portions or concave portions of the closing member are provided at intervals in the circumferential direction.
　本発明の一態様では、前記閉塞部材の凸部又は凹部は周方向に連続して設けられている。 In one aspect of the present invention, the convex portion or concave portion of the closing member is provided continuously in the circumferential direction.
　本発明の円筒体の製造方法は、本発明の遠心成形型に原料樹脂を注入し、遠心成形することにより、端面に凹部又は凸部が形成された円筒体を成形し、次いで脱型する工程を有する。 The method for producing a cylindrical body of the present invention includes a step of molding a cylindrical body having a concave or convex portion formed on an end surface thereof by pouring a raw material resin into the centrifugal mold of the present invention and then performing demolding, and then demolding. Have
　本発明の遠心成形型を用いて円筒体を成形する場合、原料樹脂の注入量は、金型本体の内周面に沿って遠心成形される円筒体の目的とする内径の大きさに合致する量とする。 When a cylindrical body is molded using the centrifugal mold of the present invention, the amount of raw material resin injected matches the target inner diameter of the cylindrical body that is centrifugally molded along the inner peripheral surface of the mold body. Amount.
　本発明の遠心成形型を用いて遠心成形された円筒体にあっては、該凹部又は凸部によって形成された凸部又は凹部が同心円状に存在する。正規形状に遠心成形される円筒体にあっては、形成された凸部又は凹部がなす同心円と、円筒体の内径がなす円形状との間隔が一定となる。また、形成された凸部又は凹部がなす同心円と、円筒体の内径がなす円形状との間隔が、正規製品の許容範囲（公差）に入っていることを目視で瞬時に判断することができる。公差の範囲は、目的とする円筒体の大きさや用途に応じて設定することができる。 In the cylindrical body that is centrifugally molded using the centrifugal mold of the present invention, the convex portion or the concave portion formed by the concave portion or the convex portion exists concentrically. In a cylindrical body that is centrifugally molded into a regular shape, the distance between the concentric circle formed by the formed convex portion or concave portion and the circular shape formed by the inner diameter of the cylindrical body is constant. In addition, it can be instantaneously determined visually that the interval between the concentric circle formed by the formed convex part or concave part and the circular shape formed by the inner diameter of the cylindrical body is within the allowable range (tolerance) of the regular product. . The tolerance range can be set according to the size and application of the target cylinder.
　遠心成形型に偏心があり、正規形状に遠心成形されない円筒体にあっては、円筒体の内径がなす円形状との間隔が不均一となったり、形成された凸部又は凹部が不均一に欠けたり、消滅したりする。 If the centrifugal mold is eccentric and the cylinder is not centrifugally molded into a regular shape, the distance from the circular shape formed by the inner diameter of the cylindrical body is non-uniform, or the formed convex or concave portions are non-uniform. It will chip or disappear.
　従って、円筒体の端面を目視観察したときに、形成された凸部又は凹部がなす同心円と、円筒体の内径がなす円形状との間隔が正規製品の許容範囲（公差）から外れて大きすぎたり、小さすぎたりすることや、凸部又は凹部が形成する同心円が崩れていたり、不均一に欠けたりいることを確認することにより、円筒体が正規形状となっているかどうかを確認することができる。すなわち、前記閉塞部材内面に設けられた凹部又は凸部は、円筒体の中空部の位置及び内径精度を確認するためにある。これによれば、円筒体を切断しなくても厚み形状の均一性に関する異常に検知できる。また、検査治具を使用するなどの、従来の内径精度を確認する場合と比較して、簡便に早く確認が可能である。さらに、円筒体に凸部又は凹部が存在するため、作業ミスが起こりづらい。くわえて、収縮する樹脂組成物であっても、アニーリング工程を待たずに成形後直ぐに確認が可能である。このように、本発明によれば、効果的に円筒体の生産効率を高めることができる。 Therefore, when the end surface of the cylindrical body is visually observed, the distance between the concentric circle formed by the formed convexity or concave portion and the circular shape formed by the inner diameter of the cylindrical body is too large outside the allowable range (tolerance) of the regular product. It is possible to confirm whether the cylindrical body is in a regular shape by confirming that the concentric circle formed by the convex part or the concave part is broken or unevenly formed. it can. That is, the concave portion or the convex portion provided on the inner surface of the closing member is for confirming the position and inner diameter accuracy of the hollow portion of the cylindrical body. According to this, even if it does not cut | disconnect a cylindrical body, it can detect abnormally regarding the uniformity of thickness shape. In addition, it is possible to confirm easily and quickly as compared with the conventional case of confirming the inner diameter accuracy such as using an inspection jig. Furthermore, since a convex part or a concave part exists in the cylindrical body, it is difficult for an operation error to occur. In addition, even a resin composition that shrinks can be confirmed immediately after molding without waiting for the annealing step. Thus, according to the present invention, it is possible to effectively increase the production efficiency of the cylindrical body.
　本発明によれば、遠心成形型から円筒成形体を取出し後すぐに、遠心成形回転装置における設備トラブル（例えば、回転ピンが摩耗する、回転軸がずれるなど）を容易に検知することできる。これにより、効果的に生産効率を向上させることができ、特に、遠心成形回転装置を自動化する場合には、画期的に生産効率を高めることができる。 According to the present invention, immediately after taking out the cylindrical molded body from the centrifugal mold, it is possible to easily detect equipment troubles in the centrifugal molding rotating device (for example, the rotating pin is worn out, the rotating shaft is shifted). Thereby, the production efficiency can be effectively improved, and in particular, when the centrifugal molding and rotating apparatus is automated, the production efficiency can be dramatically improved.
　凸部又は凹部は、円筒体の内周縁近傍に形成されるよう、設けられるようことが好ましい。これによれば、円筒体の端面を目視観察したときに、凸部又は凹部と内周縁との間隔の均一性が瞬時に判別しやすいため、円筒体の偏心や成形不良や、円筒体の内径精度が正規製品の許容範囲（公差）に入っているかどうかに即時に気付くことができる。したがって、凸部又は凹部は、内周縁に触れていることが好ましい。また、凸部又は凹部が内周縁に触れていない場合は、凸部又は凹部における内周縁からの最短長さは、例えば、０～６．０（ｍｍ）、さらには、０～２．５（ｍｍ）であることが好ましい。同様の理由から、凸部又は凹部は、少なくとも一部が内周縁に接していることが好ましい。なお、円筒体端面には凸部が、遠心成形型の閉塞部材内面には凹部が設けられることが好ましい。 The convex portion or the concave portion is preferably provided so as to be formed in the vicinity of the inner peripheral edge of the cylindrical body. According to this, when the end surface of the cylindrical body is visually observed, the uniformity of the interval between the convex portion or the concave portion and the inner peripheral edge can be easily discriminated instantaneously. You can immediately notice whether the accuracy is within the tolerance (tolerance) of the regular product. Therefore, it is preferable that the convex part or the concave part touches the inner peripheral edge. When the convex portion or the concave portion does not touch the inner peripheral edge, the shortest length from the inner peripheral edge of the convex portion or the concave portion is, for example, 0 to 6.0 (mm), and further, 0 to 2.5 ( mm). For the same reason, it is preferable that at least a part of the convex portion or the concave portion is in contact with the inner peripheral edge. In addition, it is preferable that a convex part is provided in a cylindrical body end surface, and a recessed part is provided in the closure member inner surface of a centrifugal mold.
　前記閉塞部材の凸部又は凹部の断面稜線が、曲線で構成される。これにより、円筒体を遠心成形型から脱型する際の剥離性を向上させ、バリの残存やこれによる不良品の発生を防ぐことができる。また、遠心成形型の閉塞部材の清掃が容易となるとともに、成形体の外観を向上させることができる。 The cross-sectional ridge line of the convex part or the concave part of the closing member is constituted by a curve. Thereby, the peelability at the time of removing the cylindrical body from the centrifugal mold can be improved, and the remaining of burrs and the generation of defective products due to this can be prevented. In addition, the centrifugal mold closing member can be easily cleaned, and the appearance of the molded body can be improved.
　成形された円筒体の内周縁が円筒体の端面において偏心している場合には、一部の凸部又は凹部が存在しなかったり、また一部の凸部又が凹部は内周縁から離隔して存在していたりするので、円筒体が正規形状となっていないことを容易に確認することができる。 When the inner peripheral edge of the formed cylindrical body is eccentric at the end face of the cylindrical body, some convex portions or concave portions do not exist, or some convex portions or concave portions are separated from the inner peripheral edge. Since it exists, it can be easily confirmed that the cylindrical body does not have a regular shape.
　内周縁が円筒体の外周縁と同心円となってはいるが、正規形状よりも小径であるときには、端面の凸部又は凹部が内周縁から離隔して存在しているので、円筒体が正規直径よりも小さいことを容易に確認することができる。 The inner periphery is concentric with the outer periphery of the cylinder, but when the diameter is smaller than the normal shape, the end surface has a convex or concave portion that is separated from the inner periphery, so the cylinder has a normal diameter. Can be easily confirmed.
　内周縁が円筒体の外周縁と同心円となってはいるが、正規形状よりも大径であるときには、すべての凸部又は凹部が存在しないので、円筒体が正規直径よりも大きいことを容易に確認することができる。 Although the inner peripheral edge is concentric with the outer peripheral edge of the cylindrical body, when the diameter is larger than the normal shape, there is no convex or concave portion, so it is easy to make the cylindrical body larger than the normal diameter. Can be confirmed.
　内周縁が正規形状よりも小径又は大径であり、且つ内周縁が円筒体の外周縁に対し偏心している場合も、同様にして円筒体が正規形状となっていないことを容易に確認することができる。 When the inner periphery is smaller or larger than the regular shape and the inner periphery is eccentric with respect to the outer periphery of the cylindrical body, it is easy to confirm that the cylindrical body is not in a regular shape in the same way. Can do.
　本発明で用いる樹脂材料に特に限定はなく、モノマーキャスト法により得られるポリアミド等のアニオン重合性ポリアミド、２液硬化型ウレタン樹脂など各種のものが適用可能である。なかでも、機械強度等の理由から、アニオン重合性ポリアミドを用いることが好ましい。 The resin material used in the present invention is not particularly limited, and various materials such as an anion-polymerizable polyamide such as polyamide obtained by a monomer casting method and a two-component curable urethane resin are applicable. Of these, anionic polymerizable polyamides are preferably used for reasons such as mechanical strength.
　本発明方法によって成形された円筒体は、これを用いて樹脂歯車を製造するのに好適である。樹脂歯車を製造するための円筒体は、極めて高い内径精度が要求される。円筒体から樹脂歯車を製造するには、円筒体を所定厚みに輪切り状に切断してリング体とする。そして、このリング体の内孔に金属製ハブを嵌着し、リング体の外周を切削加工して歯を形成する。 The cylindrical body formed by the method of the present invention is suitable for producing a resin gear using this. A cylindrical body for manufacturing a resin gear is required to have extremely high inner diameter accuracy. In order to manufacture a resin gear from a cylindrical body, the cylindrical body is cut into a ring shape in a predetermined thickness to obtain a ring body. Then, a metal hub is fitted into the inner hole of the ring body, and the outer periphery of the ring body is cut to form teeth.
　このリング体の内孔はリング体の外周と高精度にて目的の内径を有した同心状（同軸状）となっているので、製造された樹脂歯車は形状精度がきわめて良好である。 Since the inner hole of this ring body is concentric (coaxial) having the desired inner diameter with the outer periphery of the ring body, the manufactured resin gear has very good shape accuracy.
図１ａは実施の形態に係る遠心成形型の断面図であり、遠心成形型の軸心線方向一端側における軸心線方向に沿う断面を示している。図１ｂは図１ａの遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の斜視図である。図１ｃは図１ｂのIc－Ic断面図である。図１ｄは図１ｃのId矢視図である。FIG. 1A is a cross-sectional view of a centrifugal mold according to an embodiment, and shows a cross section along the axial direction on one end side in the axial direction of the centrifugal mold. FIG. 1B is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using the centrifugal mold of FIG. 1A. FIG. 1c is a cross-sectional view taken along the line Ic-Ic of FIG. 1b. FIG. 1d is a view taken along the arrow Id in FIG. 1c. 図２ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の斜視図である。図２ｂは図２ａのIIb－IIb線断面図である。FIG. 2a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment. 2b is a sectional view taken along line IIb-IIb of FIG. 2a. 図３ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の斜視図である。図３ｂは図３ａのIIIb－IIIb線断面図である。FIG. 3A is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment. 3b is a sectional view taken along line IIIb-IIIb of FIG. 3a. 図４ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の断面図、図４ｂは図４ａのIVb矢視図である。FIG. 4A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment, and FIG. 4B is a view taken along arrow IVb in FIG. 4A. 図５ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の断面図、図５ｂは図５ａのVb矢視図である。FIG. 5a is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment, and FIG. 5b is a view taken along the arrow Vb in FIG. 5a. 図６ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の断面図、図６ｂは図６ａのVIb矢視図である。6a is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment, and FIG. 6b is a view taken along the arrow VIb in FIG. 6a. 図７ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の断面図、図７ｂは図７ａのVIIb矢視図である。FIG. 7A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal forming method using a centrifugal mold according to another embodiment, and FIG. 7B is a view taken along the arrow VIIb in FIG. 7A. 図８ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の断面図、図８ｂは図８ａのVIIIb矢視図である。FIG. 8A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment, and FIG. 8B is a view taken along the arrow VIIIb in FIG. 8A. 図９ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の断面図、図９ｂは図９ａのIXb矢視図である。9A is a cross-sectional view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment, and FIG. 9B is a view taken along the arrow IXb in FIG. 9A. 図１０ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の端面図である。図１０ｂは図１０ａのXb－Xb線断面図である。図１０ｃは樹脂注入量を少なくして成形した円筒体の端面図、図１０ｄは図１０ｃのXd－Xd線断面図である。FIG. 10A is an end view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment. 10b is a cross-sectional view taken along line Xb-Xb of FIG. 10a. FIG. 10c is an end view of a cylindrical body molded with a small amount of resin injection, and FIG. 10d is a cross-sectional view taken along line Xd-Xd in FIG. 10c. 図１１ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の斜視図である。図１１ｂは図１１ａのXIb－XIb線断面図である。FIG. 11 a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment. 11b is a cross-sectional view taken along the line XIb-XIb of FIG. 11a. 図１２ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の斜視図である。図１２ｂは図１２ａのXIIb－XIIb線断面図である。FIG. 12 a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment. 12b is a cross-sectional view taken along line XIIb-XIIb of FIG. 12a. 図１３ａは別の実施の形態に係る遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の斜視図である。図１３ｂは図１３ａのXIIIb－XIIIb線断面図である。FIG. 13 a is a perspective view of one end side in the axial direction of a cylindrical body formed by a centrifugal molding method using a centrifugal mold according to another embodiment. 13b is a cross-sectional view taken along line XIIIb-XIIIb of FIG. 13a. 別の実施の形態に係る遠心成形型の断面図である。It is sectional drawing of the centrifugal mold which concerns on another embodiment. 別の実施の形態に係る遠心成形型の断面図である。It is sectional drawing of the centrifugal mold which concerns on another embodiment. 図１５の遠心成形型を用いた遠心成形方法を示す断面図である。It is sectional drawing which shows the centrifugal molding method using the centrifugal mold of FIG. 図１７ａは図１５の遠心成形型を用いて遠心成形した成形体の断面図、図１７ｂは図１７ａのXVIIb部分の拡大図である。FIG. 17a is a cross-sectional view of a molded body centrifugally molded using the centrifugal mold of FIG. 15, and FIG. 17b is an enlarged view of a portion XVIIb of FIG. 17a. 実施の形態に係る遠心成形型の断面図であり、遠心成形型の軸心線方向一端側における軸心線方向に沿う断面を示している。It is sectional drawing of the centrifugal mold which concerns on embodiment, and has shown the cross section which follows the axial center line direction in the axial center line direction one end side of a centrifugal mold. 図１９ａは図８の遠心成形型によって成形された円筒体の断面図であり、円筒体の軸心線方向一端側における軸心線方向に沿う断面を示している。図１９ｂは図１９ａのXIXb部分の拡大図である。FIG. 19A is a cross-sectional view of a cylindrical body formed by the centrifugal mold of FIG. 8, and shows a cross section along the axial direction on one end side in the axial direction of the cylindrical body. FIG. 19b is an enlarged view of the XIXb portion of FIG. 19a. 図２０ａは別の実施の形態に係る遠心成形型の断面図であり、遠心成形型の軸心線方向一端側における軸心線方向に沿う断面を示している。図２０ｂは図２０ａの遠心成形型を用いて遠心成形された中空成形体の一部の断面図である。FIG. 20a is a cross-sectional view of a centrifugal mold according to another embodiment, and shows a cross section along the axial direction on one end side in the axial direction of the centrifugal mold. 20b is a cross-sectional view of a part of a hollow molded body that is centrifugally molded using the centrifugal mold of FIG. 20a. 別の実施の形態に係る遠心成形型の断面図である。It is sectional drawing of the centrifugal mold which concerns on another embodiment. 別の実施の形態に係る遠心成形型の断面図である。It is sectional drawing of the centrifugal mold which concerns on another embodiment. 図２３ａは従来例に係る遠心成形型の一端側の断面図である。図２３ｂは図２３ａの遠心成形型を用いた遠心成形方法によって成形された、円筒体の軸心線方向一端側の斜視図である。FIG. 23a is a sectional view of one end side of a centrifugal mold according to a conventional example. FIG. 23b is a perspective view of one end side in the axial direction of the cylindrical body formed by the centrifugal molding method using the centrifugal mold of FIG. 23a. 図１ａの遠心成形型のシール板の底面図である。It is a bottom view of the sealing plate of the centrifugal mold of FIG. 別の実施の形態に係る遠心成形型の断面図である。It is sectional drawing of the centrifugal mold which concerns on another embodiment. 図２５の遠心成形型のシール板の底面図である。It is a bottom view of the sealing plate of the centrifugal mold of FIG.
　以下、図面を参照して実施の形態について説明する。図１ａ～１ｄは第１の実施の形態を示すものであり、図１ａは遠心成形型１０Ａの一端側を示し、図１ｂ～１ｄはこの遠心成形型１０Ａを用いて遠心成形された円筒体１Ａを示している。図２４はこの遠心成形型１０Ａのシール板３２Ａの底面図である。 Hereinafter, embodiments will be described with reference to the drawings. 1a to 1d show a first embodiment, FIG. 1a shows one end side of a centrifugal mold 10A, and FIGS. 1b to 1d show a cylindrical body 1A centrifugally molded using this centrifugal mold 10A. Is shown. FIG. 24 is a bottom view of the sealing plate 32A of the centrifugal mold 10A.
　この実施の形態の遠心成形型１０Ａでは、シール板３２Ａの遠心成形型内面のうち、円筒体１Ａの内周縁１ｉの形成予定位置に沿って複数の凹部３２ａが間隔をおいて設けられている。凹部３２ａは、この実施の形態では半球状である。遠心成形型１０Ａのその他の構成は、ロック機構が省略されている点を除いて図２３の遠心成形型１０と同一であり、同一部分に同一符号が付されている。凹部３２ａは８個設けられているがこれに限定されない。 In the centrifugal mold 10A of this embodiment, a plurality of concave portions 32a are provided at intervals along the planned formation position of the inner peripheral edge 1i of the cylindrical body 1A in the centrifugal mold inner surface of the seal plate 32A. The recess 32a is hemispherical in this embodiment. Other configurations of the centrifugal mold 10A are the same as those of the centrifugal mold 10 of FIG. 23 except that the lock mechanism is omitted, and the same portions are denoted by the same reference numerals. Although eight recesses 32a are provided, the present invention is not limited to this.
　遠心成形型１０Ａを用いて円筒体１Ａを成形する場合、原料樹脂の注入量は、金型本体１１の内周面に沿って遠心成形される円筒体１Ａの端面１ａの内周縁１ｉが凹部３２ａの端部（シール板３２の中心側の縁部）に合致する量とする。 When the cylindrical body 1A is molded using the centrifugal mold 10A, the injection amount of the raw material resin is such that the inner peripheral edge 1i of the end surface 1a of the cylindrical body 1A that is centrifugally molded along the inner peripheral surface of the mold body 11 is the recess 32a. It is set as the quantity which agree | coincides with the edge part (edge part of the center side of the sealing board 32).
　これにより、図１ｂ～１ｄの通り、遠心成形された円筒体１Ａにあっては、端面１ａの内周縁１ｉに沿って、凹部３２ａによって形成された凸部２が存在する。凸部２は、半球を直径方向に２つに割断した四分半球状であり、この割断部分が円筒体１Ａの内周縁１ｉに沿っている。遠心成形型１０Ａに偏心がなく、正規形状及び正規内径に遠心成形された円筒体１Ａにあっては、凸部２が規定間隔で内周縁１ｉに沿って規定個数（図１ｂでは８個）の凸部２が存在する。従って、円筒体１Ａの端面１ａを目視観察したときに、凸部２が内周縁１ｉに沿って規定間隔で規定個数配列していることを確認することにより、円筒体１Ａが正規形状となっていることを確認することができる。 Thus, as shown in FIGS. 1b to 1d, the centrifugally formed cylindrical body 1A has the convex portion 2 formed by the concave portion 32a along the inner peripheral edge 1i of the end surface 1a. The convex part 2 is a quarter hemisphere obtained by cleaving the hemisphere into two in the diameter direction, and the cleaved part is along the inner peripheral edge 1i of the cylindrical body 1A. In the cylindrical body 1A which is not eccentric in the centrifugal mold 10A and is centrifugally molded to have a normal shape and a normal inner diameter, a predetermined number (eight in FIG. 1b) of convex portions 2 are provided along the inner peripheral edge 1i. Convex part 2 exists. Therefore, when the end surface 1a of the cylindrical body 1A is visually observed, it is confirmed that the predetermined number of the convex portions 2 are arranged along the inner peripheral edge 1i at a predetermined interval, so that the cylindrical body 1A has a normal shape. Can be confirmed.
　内周縁１ｉが円筒体の軸心から偏心している場合には、一部の凸部２が存在せず、また他の一部の凸部２は内周縁１ｉから離隔して存在しているので、円筒体１Ａが正規形状となっていないことを容易かつ確実に確認することができる。 When the inner peripheral edge 1i is decentered from the axial center of the cylindrical body, some of the convex portions 2 do not exist, and the other part of the convex portions 2 exists away from the inner peripheral edge 1i. It can be easily and reliably confirmed that the cylindrical body 1A does not have a regular shape.
　内周縁１ｉが円筒体１Ａの外周縁と同心円となってはいるが、正規形状よりも小径であるときには、すべての凸部２が内周縁１ｉから離隔して存在しているので、円筒体１Ａが正規形状又は正規内径となっていないことを確認することができる。 Although the inner peripheral edge 1i is concentric with the outer peripheral edge of the cylindrical body 1A, when the diameter is smaller than the regular shape, all the convex portions 2 are separated from the inner peripheral edge 1i, so that the cylindrical body 1A It can be confirmed that is not a regular shape or a regular inner diameter.
　内周縁１ｉが円筒体１Ａの外周縁と同心円となってはいるが、正規形状よりも大径であるときには、全ての凸部２が存在しないので、円筒体１Ａが正規形状又は正規内径となっていないことを確認することができる。 Although the inner peripheral edge 1i is concentric with the outer peripheral edge of the cylindrical body 1A, when the diameter is larger than the normal shape, all the convex portions 2 do not exist, so the cylindrical body 1A has a normal shape or a normal inner diameter. You can be sure that it is not.
　内周縁１ｉが正規形状よりも小径又は大径であり、且つ内周縁１ｉが円筒体１Ａの外周縁に対し偏心している場合も、同様にして円筒体１Ａが正規形状又は正規内径となっていないことを確認することができる。 Similarly, when the inner peripheral edge 1i has a smaller or larger diameter than the normal shape and the inner peripheral edge 1i is eccentric with respect to the outer peripheral edge of the cylindrical body 1A, the cylindrical body 1A is not in the normal shape or the normal inner diameter. I can confirm that.
　図１ａ～１ｄでは、遠心成形型１０Ａのシール板３２に半球状の凹部３２ａを設けており、この凹部３２ａの約半分に原料樹脂が充填されることにより、形成された凸部２は四分半球状となっている。ただし、凹部３２ａの形状は、半楕円球状、円柱形、角柱形などであってもよい。なお、凹部を半球状又は半楕円球状など、入口側ほど広がった形状とすると、脱型が容易となるので、好ましい。 In FIGS. 1a to 1d, a hemispherical recess 32a is provided in the sealing plate 32 of the centrifugal mold 10A, and approximately half of the recess 32a is filled with the raw resin so that the formed protrusion 2 is divided into four parts. It is hemispherical. However, the shape of the recess 32a may be a semi-elliptical sphere, a cylinder, a prism, or the like. Note that it is preferable that the concave portion has a shape that expands toward the inlet side, such as a hemispherical shape or a semi-elliptical spherical shape, because demolding is easy.
　図２ａ～２ｃは、凸部２Ｂが半球状となっている円筒体１Ｂを示している。凸部２Ｂの数は図示に限定されない。凸部２Ｂは内周縁１ｉに沿って配置されている。図２ａ～２ｃのその他の構成は図１ｂ～１ｄと同様である。 2a to 2c show a cylindrical body 1B in which the convex portions 2B are hemispherical. The number of convex parts 2B is not limited to the figure. The convex portion 2B is disposed along the inner peripheral edge 1i. The other configurations of FIGS. 2a to 2c are the same as those of FIGS. 1b to 1d.
　図３ａ～３ｃは、凸部２Ｃが半球の一部（図３ａ～３ｃでは約１／４程度）を切り欠いた形状となっている円筒体１Ｃを示す。凸部２Ｃは、この切り欠いた部分が円筒体１Ｃの内周縁１ｉに沿うように配置されている。凸部２Ｃの数は図示に限定されない。図３ａ～３ｃのその他の構成は図１ｂ～１ｄと同様である。 FIGS. 3a to 3c show a cylindrical body 1C in which the convex portion 2C is cut out from a part of the hemisphere (about 1/4 in FIGS. 3a to 3c). The convex part 2C is arranged so that the notched part is along the inner peripheral edge 1i of the cylindrical body 1C. The number of the convex portions 2C is not limited to the illustration. Other configurations of FIGS. 3a to 3c are the same as those of FIGS. 1b to 1d.
　図４ａ，４ｂは、凸部２Ｄが四分楕円球となっている円筒体１Ｄを示している。凸部２Ｄは、楕円の長径方向を円筒体１Ｄの径方向とし、楕円の短径方向を円筒体１Ｄの内周縁１ｉに沿わせるように配置されている。図４ａ，４ｂのその他の構成は図１ｂ，１ｃと同様である。 4a and 4b show a cylindrical body 1D in which the convex portion 2D is a quadrant ellipsoid. The convex portion 2D is arranged so that the major axis direction of the ellipse is the radial direction of the cylindrical body 1D and the minor axis direction of the ellipse is along the inner peripheral edge 1i of the cylindrical body 1D. The other structure of FIG. 4a, 4b is the same as that of FIG. 1b, 1c.
　図５ａ，５ｂは、半楕円球の一部を切り欠いた形状の凸部２Ｅを有する円筒体１Ｅを示している。凸部２Ｅは、楕円の長径方向を円筒体１Ｅの径方向とし、切り欠き面を円筒体１Ｅの内周縁１ｉに沿わせるように配置されている。図５ａ，５ｂのその他の構成は図１ｂ，１ｃと同様である。 5a and 5b show a cylindrical body 1E having a convex portion 2E having a shape obtained by cutting out a part of a semi-elliptical sphere. The convex portion 2E is arranged so that the major axis direction of the ellipse is the radial direction of the cylindrical body 1E, and the notch surface is along the inner peripheral edge 1i of the cylindrical body 1E. The other structure of FIG. 5a, 5b is the same as that of FIG. 1b, 1c.
　図６ａ，６ｂは、四角錐の一部を切り欠いた形状の凸部２Ｆを有する円筒体１Ｆを示している。四角錐は、長い対角線と短い対角線とを有した、平面視（図６ｂの通り、端面１ａの正対視）が菱形となる形状のものであり、且つ長い対角線方向の一端側を切り欠いた形状となっている。凸部２Ｆは、長い対角線方向を円筒体１Ｆの径方向とし、切り欠いた部分を円筒体１Ｆの内周縁１ｉに沿わせるように配置されている。図６ａ，６ｂのその他の構成は図１ｂ，１ｃと同様である。 6a and 6b show a cylindrical body 1F having a convex portion 2F having a shape obtained by cutting out a part of a quadrangular pyramid. The quadrangular pyramid has a long diagonal line and a short diagonal line. The quadrangular pyramid has a rhombus shape in plan view (as seen in FIG. 6b, the front face of the end face 1a), and is cut out at one end in the long diagonal direction. It has a shape. The convex portion 2F is arranged so that the long diagonal direction is the radial direction of the cylindrical body 1F and the notched portion is along the inner peripheral edge 1i of the cylindrical body 1F. The other structure of FIG. 6a, 6b is the same as that of FIG. 1b, 1c.
　図７ａ，７ｂは、半円錐形の凸部２Ｇを有した円筒体１Ｇを示している。凸部２Ｇは、円錐を径方向に半分に割断した形状となっている。凸部２Ｇは、この割断した部分を円筒体１Ｇの内周縁１ｉに沿わせるように配置されている。図７ａ，７ｂのその他の構成は図１ｂ，１ｃと同様である。 7a and 7b show a cylindrical body 1G having a semiconical convex portion 2G. The convex part 2G has a shape in which the cone is cut in half in the radial direction. The convex portion 2G is arranged so that the cleaved portion follows the inner peripheral edge 1i of the cylindrical body 1G. The other structure of FIG. 7a, 7b is the same as that of FIG. 1b, 1c.
　図８ａ，８ｂは、半円柱形の凸部２Ｈを有した円筒体１Ｈを示している。凸部２Ｈは、円柱を径方向に半分に割断した形状となっている。凸部２Ｈは、この割断した部分を円筒体１Ｈの内周縁１ｉに沿わせるように配置されている。図８ａ，８ｂのその他の構成は図１ｂ，１ｃと同様である。 8a and 8b show a cylindrical body 1H having a semi-cylindrical convex portion 2H. The convex portion 2H has a shape in which a cylinder is cut in half in the radial direction. The convex portion 2H is arranged so that the cleaved portion follows the inner peripheral edge 1i of the cylindrical body 1H. The other structure of FIG. 8a, 8b is the same as that of FIG. 1b, 1c.
　図９ａ，９ｂは、平面視が略涙滴形の凸部２Ｉを有した円筒体１Ｉを示している。凸部２Ｉは、一端側が湾曲し、他端側が流線形に端部に向って細長く延在した平面視形状であり、該一端側が長手方向と直交方向に割断された形状となっている。凸部２Ｉは、この割断された部分が円筒体１Ｉの内周縁１ｉに沿うように配置されている。図９ａ，９ｂのその他の構成は図１ｂ，１ｃと同様である。 FIGS. 9a and 9b show a cylindrical body 1I having a convex portion 2I having a substantially teardrop shape in plan view. The convex portion 2I has a shape in plan view in which one end side is curved and the other end side is elongated in a streamline toward the end portion, and the one end side is cleaved in a direction orthogonal to the longitudinal direction. The convex portion 2I is arranged such that the cleaved portion is along the inner peripheral edge 1i of the cylindrical body 1I. The other configurations of FIGS. 9a and 9b are the same as those of FIGS. 1b and 1c.
　図１ａ～９ｂでは、凸部は円筒体の内周縁に沿って配置されているが、内周縁以外にも凸部を設けてもよい。 In FIGS. 1a to 9b, the convex portion is disposed along the inner peripheral edge of the cylindrical body, but a convex portion may be provided in addition to the inner peripheral edge.
　図１０ａ，１０ｂは、その一例に係る円筒体１Ｊを示すものである。図２５に示す遠心成形型１０Ａ’を用いて成形された円筒体１Ｊの端面１ａの内周縁に凸部２が設けられている。凸部２は図１ｂ～１ｄに示されたものと同一形状である。円筒体１Ｊの端面１ａの内周縁と外周縁との間に、複数の凸部２Ｊが周方向に等間隔に設けられている。各凸部２Ｊは、円筒体１Ｊの軸心に対して等半径位に位置している。
　図１０ｃ，１０ｄは、同一の遠心成形型１０Ａ’を用いて、図１０ａ，１０ｂの場合よりも樹脂注入量を少なくすることによって成形された円筒体１Ｊ’を示すものであり、図１０ｃは端面図、図１０ｄは図１０ｃのXd－Xd線断面図である。この円筒体１Ｊ’は、端面に複数の凸部２Ｊのみが存在する。
　図２５は、該円筒体１Ｊ，１Ｊ’を成形するための遠心成形型１０Ａ’の断面図、図２６はそのシール板３２の底面図である。凹部３２ａ’により凸部２Ｊが形成される。遠心成形型１０Ａ’のその他の構成は遠心成形型１０Ａと同一であり、同一符号は同一部分を示している。 10a and 10b show a cylindrical body 1J according to the example. The convex part 2 is provided in the inner periphery of the end surface 1a of the cylindrical body 1J shape | molded using centrifugal mold 10A 'shown in FIG. The convex portion 2 has the same shape as that shown in FIGS. 1b to 1d. A plurality of convex portions 2J are provided at equal intervals in the circumferential direction between the inner peripheral edge and the outer peripheral edge of the end surface 1a of the cylindrical body 1J. Each convex portion 2J is located at an equal radius with respect to the axial center of the cylindrical body 1J.
FIGS. 10c and 10d show a cylindrical body 1J ′ formed by using the same centrifugal mold 10A ′ with a smaller amount of resin injection than in the case of FIGS. 10a and 10b. FIG. 10 and 10d are sectional views taken along line Xd-Xd in FIG. 10c. This cylindrical body 1J ′ has only a plurality of convex portions 2J on its end face.
FIG. 25 is a sectional view of a centrifugal mold 10A ′ for molding the cylindrical bodies 1J and 1J ′, and FIG. 26 is a bottom view of the seal plate 32. The convex portion 2J is formed by the concave portion 32a ′. The other configuration of the centrifugal mold 10A ′ is the same as that of the centrifugal mold 10A, and the same reference numerals indicate the same parts.
　図１０ａ，１０ｂの円筒体１Ｊと図１０ｃ，１０ｄの円筒体１Ｊ’とを対比することにより、成形された円筒体が正規形状であるか否かを容易に判定することができる。例えば、図１０ａ，１０ｂの円筒体１Ｊが正規形状である場合には、図１０ｃ，１０ｄの円筒体１Ｊ’は凸部２を備えないことから、公差の範囲を外れた不良品であると判断される。さらに、正規形状に遠心成形された円筒体１Ｊであっても、凸部２が正規形状となっているか、あるいは正規個数存在するか、あるいは、凸部２と内周縁との距離がどの程度離れているかを目視で確認することにより、どの程度の誤差が生じているか容易に判断できる。 By comparing the cylindrical body 1J shown in FIGS. 10a and 10b with the cylindrical body 1J ′ shown in FIGS. 10c and 10d, it can be easily determined whether or not the formed cylindrical body has a regular shape. For example, when the cylindrical body 1J shown in FIGS. 10a and 10b has a regular shape, the cylindrical body 1J ′ shown in FIGS. 10c and 10d does not include the convex portion 2, so that it is determined as a defective product out of the tolerance range. Is done. Furthermore, even if the cylindrical body 1J is centrifugally molded into a regular shape, the convex portions 2 have a regular shape, or there is a regular number, or how far the convex portion 2 is from the inner periphery. It is possible to easily determine how much error has occurred by visually confirming whether the error has occurred.
　逆に、図１０ｃ，１０ｄに示される円筒体１Ｊ’が正規形状である場合には、図１０ａ，１０ｂに示される円筒体１Ｊは、凸部２を有するところから、公差の範囲を外れた不良品であることが即時に判断される。さらに、凸部２を有していない円筒体１Ｊ’であっても、凸部２Ｊと内周縁１ｉとの距離がどの程度であるか、あるいは、凸部２Ｊの形状、個数を目視で確認することにより、どの程度の誤差が生じているか容易に判断できる。 On the other hand, when the cylindrical body 1J ′ shown in FIGS. 10c and 10d has a regular shape, the cylindrical body 1J shown in FIGS. 10a and 10b has a convex portion 2 and thus is out of the tolerance range. It is immediately judged that the product is non-defective. Furthermore, even for the cylindrical body 1J ′ that does not have the convex portion 2, the distance between the convex portion 2J and the inner peripheral edge 1i is confirmed, or the shape and number of the convex portions 2J are visually confirmed. Therefore, it can be easily determined how much error has occurred.
　このように、本発明の遠心成形型を用いて遠心成形された円筒体は、公差の範囲にあるかどうかを容易に判断できる。さらに、円筒体の外径が同一であれば、目的とする円筒体の内径が異なる場合であっても、樹脂注入量と公差の範囲を変更することにより、同一の金型で製造することもできる。 Thus, it is possible to easily determine whether or not the cylindrical body that has been centrifugally molded using the centrifugal mold of the present invention is within a tolerance range. Furthermore, if the outer diameter of the cylindrical body is the same, even if the inner diameter of the target cylindrical body is different, it is possible to manufacture with the same mold by changing the range of resin injection amount and tolerance. it can.
　凸部２，２Ｊの形状は、図１～９の凸部のいずれのものでもよく、また、これら以外でもよい。 The shape of the convex portions 2 and 2J may be any of the convex portions of FIGS. 1 to 9, or may be other than these.
　図１ａ～１０ｄでは、凸部２，２Ａ～２Ｊは独立した突起となっているが、図１１ａ，１１ｂの円筒体１Ｋのように、内周縁１ｉに沿って延在する凸条よりなる凸部２ａとしてもよい。また、同心円上に形成される突起は、必ずしも１つの形状でなく、２以上の形状であってもよい。図１１ａ，１１ｂでは、凸部２ａは内周縁１ｉの全周にわたって連続しているが、途中の１又は２以上の箇所で途切れてもよい。また、内周縁１ｉの全周にわたって連続する曲線には、凹凸があってもよい。 In FIGS. 1a to 10d, the protrusions 2 and 2A to 2J are independent protrusions. However, like the cylindrical body 1K in FIGS. 11a and 11b, the protrusions made of protrusions extending along the inner peripheral edge 1i. It may be 2a. Further, the protrusions formed on the concentric circles are not necessarily one shape, and may be two or more shapes. In FIGS. 11a and 11b, the convex portion 2a is continuous over the entire circumference of the inner peripheral edge 1i, but may be interrupted at one or more points in the middle. Further, the curve continuous over the entire circumference of the inner peripheral edge 1i may be uneven.
　図１２ａ，１２ｂの円筒体１Ｌのように、内周縁１ｉに沿う凸条よりなる凸部２ａと、内周縁１ｉと外周縁との間に設けられた凸部２ａと同心円状の凸条よりなる凸部２ａ’とを設けてもよい。３重以上の同心円となるように、さらに他の凸条を設けてもよい。 As shown in the cylindrical body 1L of FIGS. 12a and 12b, the protrusion 2a is formed of a protrusion along the inner periphery 1i, and the protrusion 2a provided between the inner periphery 1i and the outer periphery is formed of a concentric protrusion. You may provide convex part 2a '. Other ridges may be provided so as to form triple or more concentric circles.
　図１ａ～１２ｂの円筒体１Ａ～１Ｌでは、凸部を形成しているが、遠心成形型のシール板３２Ａに凹部３２ａの代りに凸部（図示略）を設けることにより、図１３の円筒体１Ｍのように凹部５を端面１ａの内周縁１ｉに沿って設けてもよい。この場合も、内周縁１ｉが偏心したり、正規形状よりも大径又は小径となっているときには、少なくとも一部の凹部５が存在しなかったり、内周縁１ｉから離隔したりするので、直ぐに円筒体１Ｍが正規形状となっていないことを確認することができる。 In the cylindrical bodies 1A to 1L of FIGS. 1a to 12b, convex portions are formed, but by providing convex portions (not shown) instead of the concave portions 32a on the sealing plate 32A of the centrifugal mold, the cylindrical body of FIG. The recess 5 may be provided along the inner peripheral edge 1i of the end face 1a as in 1M. Also in this case, when the inner peripheral edge 1i is decentered or has a larger or smaller diameter than the regular shape, at least a part of the recess 5 does not exist or is separated from the inner peripheral edge 1i. It can be confirmed that the body 1M does not have a regular shape.
　図１３ａ，１３ｂでは、凹部５が独立した凹穴状となっているが、内周縁１ｉに沿って延在する凹条であってもよい。この場合、凹条は内周縁１ｉの全周を周回するものであってもよく、途中の１又は２以上の箇所で途切れたものであってもよい。凹部を前記図１２ａ，１２ｂの凸条２ａ，２ａ’のように、二重又は多重の同心円状に設けてもよい。 13a and 13b, the concave portion 5 has an independent concave hole shape, but may be a concave strip extending along the inner peripheral edge 1i. In this case, the concave stripe may circulate around the entire circumference of the inner peripheral edge 1i, or may be interrupted at one or more points in the middle. You may provide a recessed part in double or multiple concentric form like the protruding item | line 2a, 2a 'of said FIG. 12a, 12b.
　図１４は、図２３の遠心成形型１０において、シール板３２’に凹部３２ａを設けた遠心成形型１０Ａ’を示している。遠心成形型１０Ａ’のその他の構成は前記図２３の遠心成形型１０Ａと同一であり、同一符号は同一部分を示している。 FIG. 14 shows a centrifugal mold 10A ′ in which a concave portion 32a is provided in the seal plate 32 ′ in the centrifugal mold 10 of FIG. Other configurations of the centrifugal mold 10A 'are the same as those of the centrifugal mold 10A shown in FIG. 23, and the same reference numerals denote the same parts.
　上記実施の形態では、遠心成形された円筒体１Ａ～１Ｍの端面１ａは円筒体１Ａ～１Ｍの軸心線方向と垂直となっているが、図１７ａ，１７ｂの円筒体１Ｎのように、端面１ａが内周縁１ｉ側ほど円筒体の長手方向中央側になるように傾斜したテーパ面であってもよい。 In the above embodiment, the end surfaces 1a of the cylindrical bodies 1A to 1M formed by centrifugation are perpendicular to the axial direction of the cylindrical bodies 1A to 1M. However, as in the cylindrical body 1N of FIGS. The tapered surface 1a may be inclined such that the inner peripheral edge 1i side is closer to the center in the longitudinal direction of the cylindrical body.
　このようなテーパ状端面１ａを有した円筒体１Ｎを成形するための遠心成形型１０Ｂを図１５に示す。 FIG. 15 shows a centrifugal mold 10B for molding a cylindrical body 1N having such a tapered end face 1a.
　図１５の遠心成形型１０Ｂは、遠心成形型１０Ａ’とシール板の構成が異なる。即ち、図１５にあっては、シール板３２Ｃは、蓋１２の内面に、前記金型本体１１の管状部開口３１を覆うように設けられている。このシール板３２Ｃは、蓋１２を貫通する３本のガイドボルト３３によって金型軸線方向に移動可能に支持されるとともに、このガイドボルト３３に外装した圧接スプリング３４によって前記管状部開口３１の方向に向けて付勢されている。 15 is different from the centrifugal mold 10A 'in the configuration of the seal plate. That is, in FIG. 15, the seal plate 32 </ b> C is provided on the inner surface of the lid 12 so as to cover the tubular portion opening 31 of the mold body 11. The seal plate 32C is supported by three guide bolts 33 penetrating the lid 12 so as to be movable in the axial direction of the mold, and in the direction of the tubular portion opening 31 by a pressure contact spring 34 sheathed on the guide bolt 33. It is energized towards.
　前記圧接スプリング３４は、蓋１２を金型本体１１に装着して前記ロック爪２４の係止部２６をフランジ１３に係止させた状態で、前記シール板３２Ｃを強い力で金型本体１１の端面に押し付ける。これにより、管状部開口３１を確実にシールすると同時に、前記係止部２６とフランジ１３との係止状態を前記ロックスプリング２５と共に保持する。 In the state where the lid 12 is attached to the mold body 11 and the locking portion 26 of the lock claw 24 is locked to the flange 13, the pressure spring 34 holds the seal plate 32 </ b> C with a strong force on the mold body 11. Press against the end face. Thereby, the tubular portion opening 31 is reliably sealed, and at the same time, the locking state between the locking portion 26 and the flange 13 is held together with the lock spring 25.
　シール板３２Ｃの内面に、管状部開口３１の端面をシールするための円盤状のパッキン４１を設けるとともに、このパッキン４１の内面側に、管状部開口３１の口径に対応した外径を有する円盤状の金属製内蓋４２を設けてある。 A disc-shaped packing 41 for sealing the end surface of the tubular portion opening 31 is provided on the inner surface of the sealing plate 32C, and a disc shape having an outer diameter corresponding to the diameter of the tubular portion opening 31 is provided on the inner surface side of the packing 41. The metal inner lid 42 is provided.
　前記パッキン４１は、シール板３２Ｃの内面全体を覆うように設けられている。このパッキン４１として、シール板３２Ｃ側に適当なクッション性を有するシリコン系パッキン材４１ａを、金型本体１１側に耐熱性に優れたフッ素樹脂系パッキン材４１ｂを積層配置し、これによって十分なシール性を得ながら、十分な耐熱性を得ることができるようにしている。 The packing 41 is provided so as to cover the entire inner surface of the seal plate 32C. As this packing 41, a silicon-based packing material 41a having an appropriate cushioning property is disposed on the seal plate 32C side, and a fluororesin-based packing material 41b having an excellent heat resistance is disposed on the mold body 11 side, thereby providing a sufficient seal. Sufficient heat resistance can be obtained while obtaining properties.
　前記金属製内蓋４２は、金型本体１１の管状部分の端部に挿入された状態となる略円盤状であって、中央が金型内部方向に突出した円錐面に形成されている。この金属製内蓋４２は、シール板３２Ｃの中心を貫通したボルト４３により、シール板３２Ｃの内面との間に前記パッキン４１を挟むようにして固定されている。 The metal inner lid 42 has a substantially disc shape that is inserted into the end of the tubular portion of the mold body 11 and has a conical surface whose center projects in the mold inner direction. The metal inner lid 42 is fixed by a bolt 43 penetrating the center of the seal plate 32C so that the packing 41 is sandwiched between the inner surface of the seal plate 32C.
　シール板３２Ｃの内面にこのような金属製内蓋４２を設けることにより、金型本体１１内に注入された原料樹脂は、そのほとんどが金属製内蓋４２と接触することになり、パッキン４１と原料樹脂との接触を最少に抑えることができるので、パッキン４１の長寿命化を図ることができる。また、金属製内蓋４２の内面を円錐面としたことにより、成形後の製品と金属製内蓋４２との剥離性を向上させることができる。また、金属製内蓋４２を交換するだけで管状部の径が異なる複数種の金型本体に対応することが可能となる。 By providing such a metal inner lid 42 on the inner surface of the seal plate 32C, most of the raw material resin injected into the mold body 11 comes into contact with the metal inner lid 42, and the packing 41 and Since the contact with the raw material resin can be minimized, the life of the packing 41 can be extended. Moreover, by making the inner surface of the metal inner lid 42 into a conical surface, the peelability between the molded product and the metal inner lid 42 can be improved. Moreover, it becomes possible to deal with a plurality of types of mold main bodies having different diameters of the tubular portions simply by replacing the metal inner lid 42.
　この内蓋４２に複数の凹部４２ａが設けられている。各凹部４２ａは、内蓋４２の中心軸に対して等半径位（内周縁１ｉの形成予定位置）に位置している。即ち、各凹部４２ａから金型本体１１の内周面までの距離は等しい。円筒体を遠心成形する場合、原料樹脂は、遠心成形された円筒体の内周面が凹部４２ａの縁部（内蓋４２の中心側の縁部）に合致する量だけ注入される。 The inner lid 42 has a plurality of recesses 42a. Each recess 42a is located at an equal radius with respect to the central axis of the inner lid 42 (scheduled formation position of the inner peripheral edge 1i). That is, the distance from each recessed part 42a to the inner peripheral surface of the mold main body 11 is equal. When the cylindrical body is subjected to centrifugal molding, the raw material resin is injected in an amount such that the inner peripheral surface of the centrifugally molded cylindrical body matches the edge of the recess 42a (the edge on the center side of the inner lid 42).
　図１６は、この遠心成形型１０Ｂ内に原料樹脂Ｒを注入し、遠心成形型１０Ｃをその軸心回りに回転させて遠心成形した状態を示し、図１７ａはこの遠心成形により成形され、遠心成形型１０Ｃから脱型された直後の円筒体１Ｎを示している。図１７ｂは、図１７ａのXVIIb部分の拡大図である。図１７ａ，１７ｂ通り、円筒体１Ｎの端面１ａはテーパ状となっている。 FIG. 16 shows a state in which the raw material resin R is injected into the centrifugal mold 10B, and the centrifugal mold 10C is rotated around its axis to perform centrifugal molding. FIG. A cylindrical body 1N immediately after being removed from the mold 10C is shown. FIG. 17b is an enlarged view of the XVIIb portion of FIG. 17a. As shown in FIGS. 17a and 17b, the end surface 1a of the cylindrical body 1N is tapered.
　遠心成形型１０Ｂを用いた遠心成形では、原料樹脂Ｒに遠心力が作用するため、金型本体１１の端面とパッキン４１（フッ素樹脂系パッキン材４１ｂ）との間に原料樹脂Ｒが入り込み易い。そのため、脱型して得られた円筒体１Ｎの端面１ａの外周縁からは放射方向に張り出すバリ１ｂが形成され易い。 In centrifugal molding using the centrifugal mold 10B, since the centrifugal force acts on the raw material resin R, the raw material resin R easily enters between the end surface of the mold body 11 and the packing 41 (fluororesin-based packing material 41b). Therefore, the burr | flash 1b which protrudes in a radial direction is easy to be formed from the outer periphery of the end surface 1a of the cylindrical body 1N obtained by demolding.
　このバリ１ｂが成形品すなわち、円筒体１Ｎと一体となって脱型されるならば、遠心成形型内にバリ１ｂが残留しない。ところが、図１５の遠心成形型１０Ｂでは、円錐状の内蓋４２の外周縁が金型本体１１の内周面の直近に位置しているため、図１７ｂに明示の通り、円筒体１Ｎの端面１ａと外周面１ｃとが交わる外周縁は、その断面形状が９０゜未満の鋭角状となっている。そのため、この円筒体１Ｎにあっては、バリ１ｂの付根部分、すなわちバリ１ｂと円筒体１Ｎとの連結部分が肉薄となっており、バリ１ｂがその付根から分断され易い。脱型時にバリ１ｂが付根から分断されると、バリ１ｂが遠心成形型１０Ｂ内に残留し、次回の遠心成形工程で不良品を発生させるおそれがある。 If the burr 1b is removed from the molded product, ie, the cylindrical body 1N, the burr 1b does not remain in the centrifugal mold. However, in the centrifugal mold 10B of FIG. 15, since the outer peripheral edge of the conical inner lid 42 is positioned in the immediate vicinity of the inner peripheral surface of the mold body 11, as clearly shown in FIG. 17b, the end surface of the cylindrical body 1N The outer peripheral edge where 1a and the outer peripheral surface 1c intersect has an acute angle with a cross-sectional shape of less than 90 °. Therefore, in this cylindrical body 1N, the root portion of the burr 1b, that is, the connecting portion between the burr 1b and the cylindrical body 1N is thin, and the burr 1b is easily separated from the root. If the burr 1b is cut off from the root at the time of mold removal, the burr 1b may remain in the centrifugal mold 10B and cause a defective product in the next centrifugal molding process.
　そこで、本発明は、その一態様において、円筒体の端面の外周縁にバリが形成されても、このバリと円筒体との結合強度が高く、円筒体を脱型した際にバリが円筒体と共に遠心成形型から取り出される遠心成形型と、この遠心成形型を用いた円筒体の製造方法を提供する。 Therefore, according to one aspect of the present invention, even if a burr is formed on the outer peripheral edge of the end surface of the cylindrical body, the bonding strength between the burr and the cylindrical body is high, and the burr is formed into a cylindrical body when the cylindrical body is removed. A centrifugal mold that is taken out from the centrifugal mold and a method for manufacturing a cylindrical body using the centrifugal mold are also provided.
　かかる一態様の遠心成形型は、円筒体を遠心成形するための管状の金型本体と、該金型本体の開口を閉塞する閉塞部材とを有する遠心成形型であって、該閉塞部材の遠心成形型内方を向く閉塞部材内面に、遠心成形型内方に突出する、遠心成形型内方に向って縮径する円錐形又は円錐台形の内蓋が設けられており、該内蓋の外周縁が金型本体の内周面から所定距離Ｌだけ離隔しており、該内蓋よりも外周側は、遠心成形型の軸心線方向と垂直面となっていることを特徴とする。 The centrifugal mold according to one aspect is a centrifugal mold having a tubular mold body for centrifugally molding a cylindrical body, and a closing member that closes an opening of the mold body. A conical or frustoconical inner lid is provided on the inner surface of the closing member facing inward of the mold, and projects inward from the centrifugal mold and decreases in diameter toward the inner side of the centrifugal mold. The peripheral edge is separated from the inner peripheral surface of the mold main body by a predetermined distance L, and the outer peripheral side of the inner lid is a surface perpendicular to the axial center line direction of the centrifugal mold.
　かかる遠心成形型によって成形された円筒体は、後述の図１９ａ，１９ｂ、図２０ｂの円筒体１Ｐのように、その端面の外周側が円筒体の軸心線方向と垂直な垂直面となる。このため、円筒体の端面の外周縁に形成されるバリの付根部分の肉厚が図１７ａ，１７ｂの円筒体１Ｎよりも大きくなり、バリと円筒体の本体部分との結合強度が高いものとなる。 A cylindrical body formed by such a centrifugal mold has a peripheral surface perpendicular to the axial direction of the cylindrical body, like a cylindrical body 1P in FIGS. 19a, 19b, and 20b described later. Therefore, the thickness of the root portion of the burr formed on the outer peripheral edge of the end face of the cylindrical body is larger than the cylindrical body 1N of FIGS. 17a and 17b, and the bonding strength between the burr and the main body portion of the cylindrical body is high. Become.
　この結果、遠心成形型から円筒体を脱型する際にバリが付根から分断されることが防止され、バリが円筒体と一体となって脱型される。この結果、バリが遠心成形型内に残留することが防止され、次回以降の成形サイクルで成形される円筒体に不良品が発生することが防止される。 As a result, when removing the cylindrical body from the centrifugal mold, the burr is prevented from being separated from the root, and the burr is removed from the cylindrical body integrally. As a result, burrs are prevented from remaining in the centrifugal mold, and defective products are prevented from occurring in the cylindrical body molded in the subsequent molding cycles.
　図１８は、かかる態様に係る遠心成形型１０Ｄを示し、図１９ａ，１９ｂはこの遠心成形型１０Ｄを用いて遠心成形された円筒体１Ｐを示している。 FIG. 18 shows a centrifugal mold 10D according to such an embodiment, and FIGS. 19a and 19b show a cylindrical body 1P that is centrifugally molded using this centrifugal mold 10D.
　この実施の形態の遠心成形型１０Ｄでは、内蓋４２Ａが図１５の遠心成形型１０Ｂの内蓋４２よりも小径の円錐形となっており、内蓋４２Ａの外周縁は金型本体１１の内周面から所定距離Ｌだけ離隔している。遠心成形型１０Ｄのその他の構成は、図１５の遠心成形型１０Ｃと同一であり、同一部分に同一符号が付されている。 In the centrifugal mold 10D of this embodiment, the inner lid 42A has a conical shape with a smaller diameter than the inner lid 42 of the centrifugal mold 10B of FIG. 15, and the outer peripheral edge of the inner lid 42A is the inner periphery of the mold body 11. It is separated from the peripheral surface by a predetermined distance L. The other configuration of the centrifugal mold 10D is the same as that of the centrifugal mold 10C of FIG. 15, and the same portions are denoted by the same reference numerals.
　この遠心成形型１０Ｄを用いて円筒体１Ｐを成形する場合、原料樹脂の注入量は、金型本体１１の内周面に沿って遠心成形される円筒体１Ｐの内周縁１ｉが凹部４２ａの内蓋中心側の縁部に合致する量とする。これにより、円筒体１Ｐの端面１ａは、内蓋４２Ａに接することにより形成されたテーパ面１ｄと、前記Ｌの範囲におけるパッキン４１（フッ素樹脂系パッキン材４１ｂ）に接することにより形成された、円筒体１Ｐの軸心線方向と垂直な垂直面１ｅとによって構成される。円筒体１Ｐの半径方向における垂直面１ｅの幅ｔ２は、上記距離Ｌに合致した値となる。テーパ面１ｄの該半径方向における幅ｔ１と、該幅ｔ２との和（Ｔ＝ｔ１＋ｔ２）が円筒体１Ｅの半径方向の厚みである。 When the cylindrical body 1P is molded using the centrifugal mold 10D, the amount of raw material resin injected is such that the inner peripheral edge 1i of the cylindrical body 1P that is centrifugally molded along the inner peripheral surface of the mold body 11 is within the recess 42a. The amount matches the edge on the lid center side. Thereby, the end surface 1a of the cylindrical body 1P is formed by contacting the tapered surface 1d formed by contacting the inner lid 42A and the packing 41 (fluororesin-based packing material 41b) in the range L. The vertical surface 1e is perpendicular to the axial direction of the body 1P. Width t 2 of the vertical plane 1e in the radial direction of the cylindrical body 1P is a value that matches the above distance L. The sum (T = t 1 + t 2 ) of the width t 1 in the radial direction of the tapered surface 1 d and the width t 2 is the thickness of the cylindrical body 1 E in the radial direction.
　テーパ面１ｄの垂直面１ｅに対する傾斜角度θは１０～５０゜特に１５～４０°程度が好ましい。立ち上り部と中心部の角度を変えることも好ましい。 The inclination angle θ of the taper surface 1d with respect to the vertical surface 1e is preferably about 10 to 50 °, particularly about 15 to 40 °. It is also preferable to change the angle between the rising portion and the central portion.
　垂直面１ｅの幅ｔ２すなわち距離Ｌは、円筒体１Ｅの厚みＴにもよるが、０．５ｍｍ以上、５０ｍｍ以下で、０．８ｍｍ以上特に２．０ｍｍ以下であることが好ましい。ｔ２が小さいと、バリ１ｂの付根付近の厚さが十分には大きくならない。ｔ２が過度に大きいと、相対的にｔ１が小さくなり、円錐状内蓋４２Ａを設けたことの効果が低くなる。 The width t 2, that is, the distance L of the vertical surface 1 e depends on the thickness T of the cylindrical body 1 E, but is preferably 0.5 mm or more and 50 mm or less, 0.8 mm or more and particularly 2.0 mm or less. If t 2 is small, the thickness of the vicinity of the base of the burr 1b is not sufficiently large. If t 2 is excessively large, relatively t 1 decreases, the effect of providing the conical inner lid 42A becomes lower.
　このような垂直面１ｅを形成したことにより、端面１ａの外周縁（端面１ａと外周面１ｃとの交差角縁部）から放射方向に張り出すように形成されるバリ１ｂは、付根の厚みが図１７の円筒体１Ｎよりも大きくなり、バリ１ｂと円筒体１Ｐとの連結強度が大きくなる。その結果、円筒体１Ｐを脱型する際に、バリ１ｂが付根付近で分断されることなく、円筒体１Ｐの本体部分と一体となって脱型される。これにより、バリ１ｂが遠心成形型１０Ｄ内に残留することが防止され、不良品発生が防止される。 By forming such a vertical surface 1e, the burr 1b formed so as to project radially from the outer peripheral edge of the end surface 1a (the intersection angle edge between the end surface 1a and the outer peripheral surface 1c) has a root thickness. It becomes larger than the cylindrical body 1N of FIG. 17, and the connection strength between the burr 1b and the cylindrical body 1P increases. As a result, when removing the cylindrical body 1P, the burr 1b is removed from the base portion of the cylindrical body 1P without being divided near the root. This prevents the burr 1b from remaining in the centrifugal mold 10D and prevents the generation of defective products.
　この実施の形態では、シール板３２、パッキン４１及び内蓋４２Ａと蓋１２とによって閉塞部材が構成されている。 In this embodiment, the sealing plate 32, the packing 41, the inner lid 42A, and the lid 12 constitute a closing member.
　図１８では、内蓋４２Ａは円錐形であり、内蓋４２Ａの内面（遠心成形型１０Ｄの内部を向く面）は全体として円錐面となっているが、図２０に示す遠心成形型５０のように、シール板６０の内面側に取り付けられた内蓋７０を円錐台形状としてもよい。即ち、この内蓋７０の遠心成形型５０内を向く面は、外周縁近傍がテーパ面７１となっており、それよりも中央側は遠心成形型５０の軸心線方向と垂直な平面７２となっている。内蓋７０の外周縁は、金型本体５１の内周面から距離Ｌだけ離隔している。 In FIG. 18, the inner lid 42A has a conical shape, and the inner surface of the inner lid 42A (the surface facing the inside of the centrifugal mold 10D) is a conical surface as a whole, but like the centrifugal mold 50 shown in FIG. In addition, the inner lid 70 attached to the inner surface side of the seal plate 60 may have a truncated cone shape. That is, the surface of the inner lid 70 facing the inside of the centrifugal mold 50 has a tapered surface 71 in the vicinity of the outer peripheral edge, and a plane 72 perpendicular to the axial center line direction of the centrifugal mold 50 on the center side thereof. It has become. The outer peripheral edge of the inner lid 70 is separated from the inner peripheral surface of the mold body 51 by a distance L.
　該平面７２に複数の凹部７５が設けられている。各凹部７５は、内蓋７０の中心軸に対して等半径位に位置している。 A plurality of recesses 75 are provided in the plane 72. Each recess 75 is located at an equal radius with respect to the central axis of the inner lid 70.
　シール板６０の板央部には開口６１が設けられており、内蓋７０から突設された凸部７３が該開口６１に嵌合している。内蓋７０は、シール板６０を貫通して内蓋７０に螺合したボルト（図示略）によってシール板６０に固定されているが、内蓋７０の固定方式はこれに限定されない。 An opening 61 is provided in the central portion of the seal plate 60, and a convex portion 73 protruding from the inner lid 70 is fitted in the opening 61. The inner lid 70 is fixed to the sealing plate 60 by bolts (not shown) that pass through the sealing plate 60 and screwed into the inner lid 70, but the fixing method of the inner lid 70 is not limited to this.
　シール板６０と内蓋７０との間に介在されたパッキン８０は、シール板６０に重なるシリコン系パッキン材８１と、内蓋７０に重なるフッ素樹脂系パッキン材８２とを積層配置したものとなっている。 The packing 80 interposed between the seal plate 60 and the inner lid 70 is formed by laminating a silicon-based packing material 81 that overlaps the seal plate 60 and a fluororesin-based packing material 82 that overlaps the inner lid 70. Yes.
　遠心成形型５０の金型本体５１の端部にはフランジ５３が設けられている。金型本体５１の端面に対してパッキン８０を介してシール板６０が重なる。 A flange 53 is provided at the end of the mold body 51 of the centrifugal mold 50. The seal plate 60 overlaps the end surface of the mold body 51 via the packing 80.
　図示は省略するが、シール板６０を金型本体５１に固定するための蓋が設けられている。この蓋としては、上記蓋１２と同様の構成のものを用いることができる。シール板６０、内蓋７０及びパッキン８０と該蓋とによって閉塞部材が構成される。 Although not shown, a lid for fixing the seal plate 60 to the mold body 51 is provided. As this lid, one having the same configuration as the lid 12 can be used. The sealing plate 60, the inner lid 70, the packing 80, and the lid constitute a closing member.
　この遠心成形型５０を用いて、図２０ｂに示される円筒体３が成形される。原料樹脂の注入量は、金型本体５１の内周面に沿って遠心成形される円筒体３の端面３ａが、テーパ面７１と平面７２の外周側にも接し、内周縁３ｉが凹部７５の中央側の縁部に合致する量とする。これにより、円筒体３の端面３ａは、平面７２に接することにより形成された、成形体３の軸心線方向と垂直な垂直面３ｆと、テーパ面３７に接することにより形成されたテーパ面３ｄと、前記Ｌの範囲におけるパッキン８０（フッ素樹脂系パッキン材８２）に接することにより形成された、成形体３の軸心線方向と垂直な垂直面３ｅとによって構成される。垂直面３ｅの半径方向幅ｔ３の好適範囲は前記図１９ｂのｔ２と同様である。内周縁３ｉに沿って凸部３ｇが存在する。 Using this centrifugal mold 50, the cylindrical body 3 shown in FIG. 20b is molded. The injection amount of the raw material resin is such that the end surface 3a of the cylindrical body 3 that is centrifugally molded along the inner peripheral surface of the mold body 51 is in contact with the outer peripheral side of the tapered surface 71 and the flat surface 72, and the inner peripheral edge 3i is the recess 75. The amount matches the edge on the center side. As a result, the end surface 3 a of the cylindrical body 3 is formed by contacting the flat surface 72, the vertical surface 3 f perpendicular to the axial direction of the molded body 3, and the tapered surface 3 d formed by contacting the tapered surface 37. And a vertical surface 3e that is formed by coming into contact with the packing 80 (fluororesin-based packing material 82) in the L range and is perpendicular to the axial direction of the molded body 3. Preferred range of the radial width t 3 of the vertical surface 3e is similar to t 2 of FIG 19b. A convex portion 3g exists along the inner peripheral edge 3i.
　この円筒体３にあっても、端面３ａと外周面３ｃとの交差外周縁から張り出すバリ３ｂの付根付近の厚さが大きくなる。これにより、脱型時にバリ３ｂが分断されることが防止され、不良品発生が防止される。また、凸部３ｇにより、円筒体３の形状検査を容易に行うことができる。 Even in the cylindrical body 3, the thickness near the root of the burr 3b protruding from the outer periphery of the intersection between the end surface 3a and the outer peripheral surface 3c increases. Thereby, it is prevented that the burr 3b is divided at the time of demolding, and generation of defective products is prevented. Moreover, the shape inspection of the cylindrical body 3 can be easily performed by the convex portion 3g.
　上記実施の形態では閉塞部材として蓋１２とシール板３２，６０とを設けているが、蓋を省略し、シール板のみで閉塞部材を構成するものとしてもよい。 In the above embodiment, the lid 12 and the sealing plates 32 and 60 are provided as the closing member, but the lid may be omitted and the closing member may be constituted only by the sealing plate.
　凸部２，２Ａ～２Ｊ，２ａ，２ａ’，２ｂ，３ｇや凹部５の好ましい大きさは、内径の公差を踏まえて決定することが好ましい。 The preferable size of the convex portions 2, 2A to 2J, 2a, 2a ', 2b, 3g and the concave portion 5 is preferably determined based on the tolerance of the inner diameter.
　凸部または凹部は、独立した形状である場合、３点以上あれば同心円状であることの認識がしやすく、３２点以内であれば、バリの発生を抑えやすいため好ましい。８点程度が特に好適である。 When the convex part or the concave part is an independent shape, it is easy to recognize that it is concentric if it is 3 points or more, and if it is within 32 points, it is preferable because it is easy to suppress the occurrence of burrs. About 8 points are particularly suitable.
　図１４～１６の遠心成形型１０Ａ’，１０Ｂ，１０Ｄでは、図２３に示すロック装置２１を備えるものとしているが、ロック機構はこれに限定されず、各種のものを採用することができる。かかるロック機構付き遠心成形型の一例を図２１，２２に示す。 14 to 16 include the locking device 21 shown in FIG. 23, but the locking mechanism is not limited to this, and various types can be adopted. An example of such a centrifugal mold with a lock mechanism is shown in FIGS.
　図２１の遠心成形型１００は、管状の金型本体１１１と、該金型本体１１１の開口を閉塞するための蓋１１２とを有する。蓋１１２に前記凹部又は凸部が設けられている。金型本体１１１内に原料樹脂を注入し、蓋１１２を装着した後、金型軸線を中心として高速回転させることにより、金型本体１１１の内周面に沿う筒状の成形品が成形される。蓋１１２は、金型本体１１１の開口端面を閉塞する円盤状の蓋板１１３と、該蓋板１１３の外周から金型本体１１１の外周面に対して一定間隔を空けて沿うように設けられた筒状の側筒部１１４とを有している。 21 has a tubular mold body 111 and a lid 112 for closing the opening of the mold body 111. The centrifugal mold 100 shown in FIG. The lid 112 is provided with the concave portion or the convex portion. After injecting the raw material resin into the mold body 111 and mounting the lid 112, a cylindrical molded product along the inner peripheral surface of the mold body 111 is formed by rotating at high speed around the mold axis. . The lid 112 is provided so as to follow a disc-shaped lid plate 113 that closes the opening end surface of the mold main body 111 and from the outer periphery of the lid plate 113 to the outer peripheral surface of the mold main body 111 with a predetermined interval. And a cylindrical side tube portion 114.
　蓋１１２を金型本体１１１に固定するためのロック装置１２１は、蓋１１２の側筒部１１４に複数箇所、例えば等間隔で３～４箇所に設けられたロック爪支持部１２２と、各ロック爪支持部１２２にそれぞれ取り付けられたロック爪１２３と、該ロック爪１２３をロック位置方向に付勢するスプリング１２４と、側筒部１１４の先端に設けられたロック解除リング１２５とを有している。 The lock device 121 for fixing the lid 112 to the mold body 111 includes a lock claw support portion 122 provided at a plurality of locations, for example, 3 to 4 locations at equal intervals on the side cylinder portion 114 of the lid 112, and each lock claw. It has a lock claw 123 attached to each support portion 122, a spring 124 that urges the lock claw 123 in the lock position direction, and a lock release ring 125 provided at the tip of the side tube portion 114.
　ロック爪支持部１２２は、ロック爪１２３を軸支するためのピン（支軸）１２６を取り付けるピン孔と、前記スプリング１２４を装着するためのスプリング収納部１２７と、前記ロック解除リング１２５を支持するボルト１２８を取り付ける雌ねじ部とを有している。ボルト１２８を取り付ける雌ねじ部は、側筒部１１４の全周にわたって設けられるロック解除リング１２５を支持するものであるから、ロック爪支持部１２２の位置とは関係なく、側筒部１１４の任意の位置に設けることができる。 The lock claw support portion 122 supports a pin hole for attaching a pin (support shaft) 126 for pivotally supporting the lock claw 123, a spring accommodating portion 127 for mounting the spring 124, and the lock release ring 125. And an internal thread portion to which the bolt 128 is attached. Since the female thread portion to which the bolt 128 is attached supports the unlocking ring 125 provided over the entire circumference of the side tube portion 114, the position of the side tube portion 114 is arbitrary regardless of the position of the lock claw support portion 122. Can be provided.
　ロック解除リング１２５は、金型本体外周面と側筒部内周面との間に挿入されるロック解除片１３１と、側筒部外周面に沿う状態の取付片１３２と、取付片１３１，１３２を連結する連結片１３３とからなる断面コ字状のものである。前記取付片１３２には、前記ボルト１２８の取付位置に対応するように、金型軸線方向に長軸を有する長孔１３４が設けられている。このロック解除リング１２５は、長孔１３４を挿通した前記ボルト１２８により、側筒部１１４の先端に金型軸線方向に対して移動可能な状態で取り付けられる。 The unlocking ring 125 includes an unlocking piece 131 inserted between the outer peripheral surface of the mold body and the inner peripheral surface of the side cylinder portion, an attachment piece 132 in a state along the outer peripheral surface of the side cylinder portion, and the attachment pieces 131 and 132. It has a U-shaped cross section composed of connecting pieces 133 to be connected. The mounting piece 132 is provided with a long hole 134 having a long axis in the mold axial direction so as to correspond to the mounting position of the bolt 128. The lock release ring 125 is attached to the tip of the side cylinder portion 114 in a movable state with respect to the mold axial direction by the bolt 128 inserted through the long hole 134.
　ロック爪１２３は、前記ピン１２６に基端部が支持されて回動可能な状態となっており、回動端（内端）は、側筒部内周面から金型本体側に突出して金型本体外周面に当接可能な状態となっている。このロック爪１２３は、前記スプリング１２４によって突出方向に付勢されており、蓋１１２を金型本体１１１に装着していない状態では、ロック解除リング１２５におけるロック解除片１３１の先端に当接する位置まで回動した状態に保持されている。このとき、ロック解除リング１２５は、スプリング１２４により付勢されたロック爪１２３によって側筒部先端から離れた位置（反蓋板側）に押し付けられた状態になるとともに、このときのロック爪１２３の回動端は、金型本体１１１の外周面に相当する位置よりも内周側に突出した状態となっている。 The lock claw 123 has a base end portion supported by the pin 126 and is in a rotatable state. The rotation end (inner end) protrudes from the inner peripheral surface of the side tube portion toward the mold main body, and is a mold. It is in a state where it can contact the outer peripheral surface of the main body. The lock claw 123 is urged in the projecting direction by the spring 124, and in a state where the lid 112 is not attached to the mold body 111, the lock claw 123 reaches a position where it comes into contact with the tip of the lock release piece 131 in the lock release ring 125. It is held in a rotated state. At this time, the lock release ring 125 is pressed to a position (on the side opposite to the cover plate) away from the end of the side tube by the lock claw 123 biased by the spring 124, and the lock claw 123 at this time The rotating end is in a state of protruding to the inner peripheral side from a position corresponding to the outer peripheral surface of the mold main body 111.
　このように形成したロック装置１２１は、蓋１１２を金型本体１１１に装着する際に、ロック爪１２３の回動端が金型本体１１１の外周面に接触することにより、スプリング１２４の付勢力に抗してロック爪１２３が蓋板１１３側に押し戻される状態になる。蓋１１２が金型本体１１１の開口を閉塞する位置となり、蓋板１１３に設けたパッキン１１５が押し潰された閉塞状態になると、ロック爪１２３は、スプリング１２４の付勢力によって回動端が金型本体１１１の外周面に当接した状態に保持される。 The lock device 121 formed in this way is configured to reduce the biasing force of the spring 124 when the rotation end of the lock claw 123 contacts the outer peripheral surface of the mold body 111 when the lid 112 is mounted on the mold body 111. Accordingly, the lock claw 123 is pushed back to the cover plate 113 side. When the lid 112 is in a position to close the opening of the mold main body 111 and the packing 115 provided on the lid plate 113 is crushed and closed, the lock claw 123 is rotated at the end of the mold by the urging force of the spring 124. The main body 111 is held in contact with the outer peripheral surface.
　そして、この閉塞状態において、ロック爪１２３の回動端が金型本体１１１の外周面に当接する位置は、前記ピン１２６よりも開口側（蓋板１１３側）に位置するように各部の寸法や位置関係が設定されている。これにより、ピン１２６を中心として回動するロック爪１２３は、ピン１２６と回動端当接部との位置関係により、金型本体と側筒部との間に楔状に食い込んだロック状態となる。したがって、開き方向への蓋１１２の移動が阻止されることになり、蓋１１２が金型本体１１１の開口を閉塞した状態に保持されることになる。すなわち、蓋１１２は、金型本体１１１に対して軸線方向に組み付けるだけで自動的に閉塞状態に保持されることになる。 In this closed state, the position where the rotation end of the lock claw 123 abuts on the outer peripheral surface of the mold body 111 is the size of each part so that the position is closer to the opening side (the cover plate 113 side) than the pin 126. The positional relationship is set. Thereby, the lock claw 123 that rotates about the pin 126 is in a locked state in which it is wedged between the mold main body and the side tube portion due to the positional relationship between the pin 126 and the rotation end contact portion. . Therefore, the movement of the lid 112 in the opening direction is prevented, and the lid 112 is held in a state where the opening of the mold body 111 is closed. That is, the lid 112 is automatically held in a closed state only by being assembled in the axial direction with respect to the mold body 111.
　成形後に蓋１１２を金型本体１１１から取り外す場合は、前記ロック解除リング１２５を蓋板１１３側に移動させ、ロック解除片１３１によってロック爪１２３を蓋板側に回動させることにより、回動端と金型本体１１１の外周面との当接状態、即ちロック爪１２３によるロック状態を解除することができる。 When the lid 112 is removed from the mold body 111 after molding, the lock release ring 125 is moved to the lid plate 113 side, and the lock claw 123 is pivoted to the lid plate side by the lock release piece 131, thereby turning the rotation end. And the outer peripheral surface of the mold body 111, that is, the locked state by the lock claw 123 can be released.
　図２２の遠心成形型２００は、管状の金型本体２１１と、該金型本体２１１の開口を閉塞するための蓋２１２とを有するものであって、蓋２１２に前記凹部又は凸部が設けられている。金型本体２１１内に原料樹脂を注入し、蓋２１２を装着した後、金型軸線を中心として高速回転させることにより、金型本体２１１の内周面に沿う筒状の成形品を得るものである。 22 includes a tubular mold body 211 and a lid 212 for closing the opening of the mold body 211, and the lid 212 is provided with the concave portion or the convex portion. ing. After injecting the raw material resin into the mold main body 211 and attaching the lid 212, a cylindrical molded product along the inner peripheral surface of the mold main body 211 is obtained by rotating at high speed around the mold axis. is there.
　蓋２１２を金型本体２１１に固定するためのロック装置２２１は、蓋２１２の外周３箇所に等間隔で設けられたロック爪支持部２２２と、各ロック爪支持部２２２にそれぞれ取り付けられたロック爪２２３とを有している。ロック爪支持部２２２は、ロック爪２２３を挟む一対の支持片２２４を有する。各支持片２２４は、蓋２１２の外周を切削して形成されるとともに、ロック爪支持部２２２の上面２２２ａを蓋外周側が下がるように傾斜させた状態としている。支持片２２４には、ロック爪２２３を支持するためのピン２２５を取り付けるピン孔２２７が設けられている。 The lock device 221 for fixing the lid 212 to the mold body 211 includes a lock claw support portion 222 provided at three equal intervals on the outer periphery of the lid 212 and a lock claw attached to each lock claw support portion 222. 223. The lock claw support portion 222 has a pair of support pieces 224 that sandwich the lock claw 223. Each support piece 224 is formed by cutting the outer periphery of the lid 212, and the upper surface 222a of the lock claw support portion 222 is inclined so that the outer periphery side of the lid is lowered. The support piece 224 is provided with a pin hole 227 for attaching a pin 225 for supporting the lock claw 223.
　ロック爪２２３は、その先端部に、金型本体２１１に設けられているフランジ２１３に係止する係止部２２６を有するとともに、後端部に、ナット螺合用の雄ねじ部を有している。このロック爪２２３は、中間部に設けられた爪長手方向の長孔２２７に前記ピン２２５を挿通させた状態で前記支持片２２４に軸支されることにより、金型軸線方向に移動可能かつ法線方向に傾動可能な状態となっている。 The lock claw 223 has a locking portion 226 that locks on a flange 213 provided in the mold main body 211 at the front end portion, and a male screw portion for nut screwing at the rear end portion. The lock claw 223 can be moved in the mold axial direction by being pivotally supported by the support piece 224 with the pin 225 inserted through a long hole 227 in the claw longitudinal direction provided in an intermediate portion. It can be tilted in the linear direction.
　ロック爪２２３は、蓋２１２に取り付けるときに、後端部の雄ねじ部に螺合させたナット２２８と前記ロック爪支持部２２２との間に、ワッシャー２２９を介してコイルスプリング２３０を圧縮状態で装着している。このコイルスプリング２３０は、先端側がロック爪支持部２２２の上面２２２ａ、即ちコイルスプリング当接面に対して外周側が爪先端方向に変位した状態で圧接するため、外周側の撓み量に比べて内周側の撓み量が大きくなる。したがって、ロック爪２２３には、コイルスプリング２３０の復元力によって後端部側（ナット側）が蓋外周に倒れる方向の力が作用し、係止部２２６をフランジ２１３に係止させる方向の力となる。 When the lock claw 223 is attached to the lid 212, the coil spring 230 is attached in a compressed state via a washer 229 between the nut 228 screwed into the male screw portion at the rear end and the lock claw support portion 222. is doing. The coil spring 230 is pressed against the upper surface 222a of the lock claw support portion 222, that is, the coil spring abutting surface, with the outer peripheral side displaced in the direction of the claw tip. The amount of side deflection increases. Accordingly, a force in a direction in which the rear end side (nut side) falls to the outer periphery of the lid by the restoring force of the coil spring 230 acts on the lock claw 223, and a force in a direction to lock the locking portion 226 with the flange 213. Become.
　このように形成したロック装置２２１は、蓋２１２を金型本体２１１に装着した状態では、前記コイルスプリング２３０の作用でロック爪２２３の係止部２２６がフランジ２１３に確実に係止した状態になるとともに、蓋２１２を金型本体２１１の開口に押し付けた状態となる。このとき、コイルスプリング２３０の性能を適当に選択することにより、必要十分な押し付け力で蓋２１２を金型本体２１１に密着させることができる。また、ロック爪２２３へのナット２２８の螺合量を変えることにより、コイルスプリング２３０による押し付け力を微調整することが可能である。 The lock device 221 formed in this manner is in a state where the locking portion 226 of the lock claw 223 is securely locked to the flange 213 by the action of the coil spring 230 when the lid 212 is mounted on the mold body 211. At the same time, the lid 212 is pressed against the opening of the mold body 211. At this time, the lid 212 can be brought into close contact with the mold body 211 with a necessary and sufficient pressing force by appropriately selecting the performance of the coil spring 230. Further, the pressing force by the coil spring 230 can be finely adjusted by changing the screwing amount of the nut 228 to the lock claw 223.
　ロック装置２２１のロック解除は、ロック爪２２３の後端を蓋内周側に傾動させることによって行うことができる。このロック爪２２３の傾動操作は、内周に蓋側が拡開した円錐状のテーパー面を有するロック解除治具（図示略）を金型軸線方向に押し付けることによって容易に行うことができる。また、ロック解除治具のテーパー面を蓋２１２に対応した最大径を有する円錐面状に形成しておくことにより、３箇所のロック爪２２３を、これらの位置に関係なく同時に傾動させることができる。したがって、このような円錐面を有するロック解除用の治具と、蓋２１２を把持する治具とを組み合わせることにより、金型本体２１１に対する蓋２１２の着脱及びロック装置２２１の開閉操作を自動的に行うことが可能となる。 The lock device 221 can be unlocked by tilting the rear end of the lock claw 223 toward the inner periphery of the lid. The tilting operation of the lock claw 223 can be easily performed by pressing a lock release jig (not shown) having a conical taper surface with the lid side widened on the inner periphery in the mold axial direction. Further, by forming the tapered surface of the unlocking jig into a conical surface having the maximum diameter corresponding to the lid 212, the three lock claws 223 can be tilted at the same time regardless of these positions. . Accordingly, by combining the unlocking jig having such a conical surface and the jig for gripping the lid 212, the attachment / detachment of the lid 212 with respect to the mold body 211 and the opening / closing operation of the locking device 221 are automatically performed. Can be done.
　本発明では、円筒体の内孔は円筒体の外周面と完全に同軸状である必要はなく、若干偏心していてもよい。 In the present invention, the inner hole of the cylindrical body does not have to be completely coaxial with the outer peripheral surface of the cylindrical body, and may be slightly decentered.
　上記実施の形態は本発明の一例であり、本発明は上記以外の構成とされてもよい。本発明では、成形された円筒体の内面にメッキ（例えばクロムメッキ）やプラズマ処理などの表面処理を施してもよい。また、円筒体の内面にシリコン系材料やフッ素系材料などの層を形成して積層構造としてもよい。 The above embodiment is an example of the present invention, and the present invention may have a configuration other than the above. In the present invention, surface treatment such as plating (for example, chromium plating) or plasma treatment may be performed on the inner surface of the formed cylindrical body. Alternatively, a layered structure may be formed by forming a layer of silicon-based material or fluorine-based material on the inner surface of the cylindrical body.
　本出願は、２０１６年６月３０日付で出願された日本特許出願２０１６－１３０４１０に基づいており、その全体が引用により援用される。 This application is based on Japanese Patent Application No. 2016-130410 filed on June 30, 2016, which is incorporated by reference in its entirety.
　１，１Ａ～１Ｐ，３　円筒体
　１ａ　端面
　１ｂ　バリ
　１ｉ　内周縁
　２，２Ａ～２Ｉ，２ａ，２ａ’，２ｂ，３ｇ　円筒体の凸部
　１０，１０Ａ，１０Ａ’，１０Ｂ，１０Ｄ，５０，１００，２００　遠心成形型
　１１，５１　金型本体
　３２，３２Ａ，６０　シール板
　４１，８０　パッキン
　４２，４２Ａ，７０　内蓋
　４２ａ，７５　遠心成形型の凹部 1, 1A to 1P, 3 Cylindrical body 1a End face 1b Burr 1i Inner peripheral edge 2, 2A to 2I, 2a, 2a ', 2b, 3g Cylindrical convex part 10, 10A, 10A', 10B, 10D, 50, 100, 200 Centrifugal mold 11, 51 Mold body 32, 32A, 60 Seal plate 41, 80 Packing 42, 42A, 70 Inner lid 42a, 75 Recess of centrifugal mold

Claims (11)

  1. 　円筒体を遠心成形するための管状の金型本体と、該金型本体の開口を閉塞する閉塞部材とを有する遠心成形型であって、
    　該閉塞部材の遠心成形型内方を向く閉塞部材内面に、成形された円筒体端面に凸部又は凹部を形成するための凹部又は凸部が同心円上に設けられていることを特徴とする遠心成形型。     A centrifugal mold having a tubular mold body for centrifugally molding a cylindrical body, and a closing member for closing an opening of the mold body,
    The centrifuge is characterized in that a concave portion or a convex portion for forming a convex portion or a concave portion is formed on a concentric circle on the inner surface of the molded cylindrical body on the inner surface of the closing member facing the inside of the centrifugal mold of the closing member. Mold.
  2. 　前記閉塞部材内面の凹部又は凸部が、円筒体の内周縁近傍に設けられていることを特徴とする請求項１に記載の遠心成形型。 2. The centrifugal mold according to claim 1, wherein a concave or convex portion on the inner surface of the closing member is provided in the vicinity of the inner peripheral edge of the cylindrical body.
  3. 　前記閉塞部材内面の凹部又は凸部が、円筒体の内周縁に沿って設けられていることを特徴とする請求項２に記載の遠心成形型。 3. The centrifugal mold according to claim 2, wherein a concave portion or a convex portion on the inner surface of the closing member is provided along the inner peripheral edge of the cylindrical body.
  4. 　前記閉塞部材の凸部又は凹部の断面稜線が、曲線で構成されることを特徴とする請求項１から３のいずれかに記載の遠心成形型。 The centrifugal mold according to any one of claims 1 to 3, wherein a cross-sectional ridge line of the convex portion or the concave portion of the closing member is configured by a curve.
  5. 　前記閉塞部材の凸部又は凹部は、円筒体の内径精度を検査するために設けられることを特徴とする請求項１から４のいずれかに記載の遠心成形型。 5. The centrifugal mold according to any one of claims 1 to 4, wherein the convex portion or the concave portion of the closing member is provided to inspect the inner diameter accuracy of the cylindrical body.
  6. 　前記閉塞部材の凸部又は凹部は、周方向に間隔をおいて複数個設けられていることを特徴とする請求項１から５のいずれかに記載の遠心成形型。 The centrifugal mold according to any one of claims 1 to 5, wherein a plurality of convex portions or concave portions of the closing member are provided at intervals in the circumferential direction.
  7. 　前記閉塞部材の凸部又は凹部は周方向に連続して設けられていることを特徴とする請求項１から６に記載の遠心成形型。 7. The centrifugal mold according to claim 1, wherein the projections or recesses of the closing member are continuously provided in the circumferential direction.
  8. 　請求項１ないし７のいずれか１項に記載の遠心成形型に原料樹脂を注入し、遠心成形することにより、端面に凹部又は凸部が形成された円筒体を成形し、次いで脱型する工程を有する円筒体の製造方法。 A step of injecting a raw material resin into the centrifugal mold according to any one of claims 1 to 7, forming a cylindrical body having a concave portion or a convex portion on an end surface by centrifugal molding, and then demolding the cylindrical body. The manufacturing method of the cylindrical body which has.
  9. 　アニオン重合性ポリアミド系組成物を用いる、請求項８に記載の円筒体の製造方法。 The method for producing a cylindrical body according to claim 8, wherein an anionically polymerizable polyamide-based composition is used.
  10. 　請求項１ないし７のいずれか１項に記載の遠心成形型を用いて得られる円筒形樹脂成形体の内径面に、金属芯材を嵌着固定する金属樹脂複合体の製造方法。 A method for producing a metal resin composite in which a metal core material is fitted and fixed to an inner diameter surface of a cylindrical resin molded body obtained by using the centrifugal mold according to any one of claims 1 to 7.
  11. 　請求項１ないし７のいずれか１項に記載の遠心成形型に原料樹脂を注入し、遠心成形することにより、端面に凹部又は凸部が形成された円筒体を成形し、次いで脱型する工程を有する円筒体の内径精度の検査方法。 A step of injecting a raw material resin into the centrifugal mold according to any one of claims 1 to 7, forming a cylindrical body having a concave portion or a convex portion on an end surface by centrifugal molding, and then demolding the cylindrical body. Inspection method of inner diameter accuracy of cylindrical body having
PCT/JP2017/018350 2016-06-30 2017-05-16 Centrifugal forming mold and method for manufacturing cylindrical body WO2018003329A1 (en)

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