WO2015119143A1 - チューブ、チューブの製造方法、及び金型 - Google Patents
チューブ、チューブの製造方法、及び金型 Download PDFInfo
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- WO2015119143A1 WO2015119143A1 PCT/JP2015/053082 JP2015053082W WO2015119143A1 WO 2015119143 A1 WO2015119143 A1 WO 2015119143A1 JP 2015053082 W JP2015053082 W JP 2015053082W WO 2015119143 A1 WO2015119143 A1 WO 2015119143A1
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- WIPO (PCT)
- Prior art keywords
- mold
- tube
- hole
- cavity
- resin
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1671—Making multilayered or multicoloured articles with an insert
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/08—Tubes; Storage means specially adapted therefor
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1701—Component parts, details or accessories; Auxiliary operations using a particular environment during moulding, e.g. moisture-free or dust-free
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/261—Moulds having tubular mould cavities
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2207/00—Methods of manufacture, assembly or production
- A61M2207/10—Device therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
- B29K2083/005—LSR, i.e. liquid silicone rubbers, or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/12—Thermoplastic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0058—Liquid or visquous
- B29K2105/0067—Melt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/005—Hoses, i.e. flexible
- B29L2023/007—Medical tubes other than catheters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7542—Catheters
Definitions
- the present invention relates to a tube, a method for manufacturing the tube, and a mold.
- a cannula which is a tubular member, is known as one of medical devices.
- a cannula is made of resin and is inserted into a patient's lumen or blood vessel, and used for draining body fluids or injecting infusions of drug solutions or contrast media.
- Patent Document 1 describes a method of manufacturing a medical tube by injection molding.
- the injection molding has an advantage that a tube having a complicated shape that is difficult to produce by extrusion molding can be manufactured with high accuracy.
- the medical tube made of only resin is bent by applying force, and the cavity is narrowed.
- the transportation of blood or a chemical solution is hindered and in some cases it cannot be transported at all.
- the medical tube of Patent Document 1 has a helical reinforcing body embedded in a thick portion (thickness portion). Thereby, it is hard to bend, and as a result, it can suppress that a hollow part becomes narrow and can prevent the trouble in conveyance of a chemical
- a pre-molded silicone rubber tube is put on a core pin, and secondly, a stainless steel spiral reinforcement is put on a silicone rubber tube.
- a manufacturing method in which a core pin covered with a reinforcing body and a silicone rubber tube is set in a cavity of a mold and injection molding is performed.
- a primary molded body corresponding to the lower half of the tube is molded using a first molding mold body and a closing mold body, and then replaced with a closing mold body.
- This is a method of forming a secondary molded body corresponding to the upper half of the tube using the second molding die, and describes a manufacturing method capable of accurately molding a thin-walled tube.
- Patent Document 1 is a manufacturing method in which a silicone rubber tube is formed in advance, a silicone rubber tube is covered with a spiral reinforcing body, and injection molding is further performed. Compared with a tube having no reinforcing body. The process is complicated.
- the inner diameter of the reinforcing body is designed to be larger than the outer diameter of the silicone rubber tube. Therefore, there is a problem that it is difficult to control the arrangement of the reinforcing body so that the central axis of the silicone rubber tube and the central axis of the reinforcing body coincide with each other. For this reason, in the thickness part of the completed medical tube, there exists a possibility that a reinforcement may be biased and arranged in the radial direction (direction perpendicular to the longitudinal direction of the medical tube) of the medical tube. Furthermore, in some cases, a part of the reinforcing body may be exposed on the surface of the tube.
- the reinforcing body is displaced from a predetermined position due to pressure applied to the reinforcing body during injection molding.
- the reinforcing body moves in the longitudinal direction of the silicone rubber tube due to the injection pressure, and shifts from a predetermined position.
- the manufacturing method of Patent Document 2 is a complicated manufacturing method including a step of forming the lower half of the tube and a step of forming the upper half of the tube, and further requires three types of molds.
- the process is further complicated, and the number of necessary molds is further increased.
- this invention is made
- the objective is the tube manufacturing method for shape
- a method of manufacturing a tube according to one aspect of the present invention includes a thickness portion and a hollow portion, and includes an annular, cylindrical, or spiral reinforcing member in the thickness portion.
- a method of manufacturing a tube wherein the reinforcing member and a core pin for forming the cavity portion are disposed in a cavity of a first mold, and resin molding is performed along the outer peripheral surface of the tubular resin.
- the primary molded body is disposed in a first step of molding the primary molded body provided with the reinforcing member and a cavity of a second mold having an inner diameter larger than the inner diameter of the first mold. And a second step of covering the reinforcing member by resin molding.
- a mold according to an aspect of the present invention includes a thickness portion and a hollow portion, and includes an annular, cylindrical, or spiral reinforcing member in the thickness portion.
- a mold for forming a tube which includes a first mold and a second mold, and an inner diameter of the second mold is larger than an inner diameter of the first mold, and the first mold
- the inner wall surface is provided with a plurality of hole-shaped recesses.
- a tube includes a thickness portion and a hollow portion, and at least one annular member or cylindrical member, or at least one winding in the thickness portion.
- the thickness of the first resin layer is thicker than that of the other first resin layer, and the thickness of the second resin layer is thinner than that of the other second resin layer.
- mold means a “mold” used for resin molding, and the material of the mold is appropriately selected from metal materials and non-metal materials according to the resin molding method. be able to.
- a tube having a thin thickness portion and which is not easily bent it is possible to provide a tube having a thin thickness portion and which is not easily bent, a tube manufacturing method for forming the tube by a simple process, and a mold used for forming the tube. .
- FIG. 1 is a perspective view of a part of a resin molding die according to Embodiment 1 of the present invention, in which (a) shows a state in which a resin receiving die and an opposing die are opposed to each other, and (b) is an opposing side. A mold is shown, and (c) shows a resin receiving side mold. It is a virtual perspective view which shows the channel
- FIG. 4 is a schematic view of a first mold according to Embodiment 2 of the present invention, (a) is a plan view, (b) is a cross-sectional view taken along line FF in (a), and (c) is a cross-sectional view. It is a GG arrow directional cross-sectional view of (a), (d) is an enlarged view of the H section of (b).
- FIG. 6 is a schematic view of a first mold according to Embodiment 3 of the present invention, (a) is a plan view, (b) is a cross-sectional view taken along line II of (a), and (c) is a cross-sectional view. It is a JJ arrow directional cross-sectional view of (a), (d) is an enlarged view of the K section of (b).
- Embodiment 1 a method for manufacturing a tube, a tube, and a mold according to an embodiment of the present invention will be described in detail with reference to FIGS.
- FIG. 1 is a perspective view of a part of a resin molding die 1 according to the present embodiment, in which (a) shows a state in which a resin receiving die and an opposing die are opposed to each other, and (b) An opposing side metal mold
- resin molding applicable to the present invention examples include injection molding and vacuum casting. In the following, first, an embodiment of injection molding will be described, and an embodiment of vacuum casting will be described later.
- the injection molding machine includes a resin mold 1 and an injection unit (not shown), but the configuration of the injection unit is the same as the configuration of a conventional injection unit, and thus illustration and detailed description thereof are omitted.
- the resin molding die 1 is provided with an opposing side die 10 and a resin receiving side die 20 which are arranged to face each other.
- the opposing mold 10 includes an opposing mold 15, a primary molding lower mold 30 and a secondary molding lower mold provided on the opposing mold 15. 60.
- the resin receiving side mold 20 includes a resin receiving side mounting plate 25 (base plate), an upper mold 40 for primary molding provided on the resin receiving side mounting plate 25, and And an upper mold 70 for secondary molding.
- the resin receiving side mounting plate 25 has a locating ring 6 for facilitating alignment with the injection unit, and a surface facing the opposing mold 10. And four guide pins 21 provided at the four corners.
- the opposed template 15 includes a guide pin bush 11 into which the guide pin 21 is inserted. By inserting the guide pin 21 into the guide pin bush 11, the resin receiving side mold 20 and the opposing side mold 10 are aligned and brought into close contact with each other. Thereby, the resin mold 1 is clamped.
- the facing mold 10 is provided with a runner 12 on the surface facing the resin receiving mold 20.
- the resin receiving side mold 20 includes a sprue 22 that communicates with the runner 12 when the resin molding mold 1 is clamped.
- the sprue 22 penetrates the resin receiving side mold 20, and molten resin is introduced from the nozzle of the injection unit through the sprue bushing.
- the primary mold lower mold 30 and the primary mold upper mold 40 form a first mold, which is a mold for primary molding
- the secondary mold lower mold 60 and the second mold A second mold that is a mold for secondary molding is formed by the upper mold 70 for subsequent molding.
- the inner diameter (cavity diameter) of the second mold is larger than the inner diameter (cavity diameter) of the first mold.
- FIG. 2 is a virtual perspective view showing a passage through which the molten resin flows
- (a) is a virtual perspective view showing a passage through which the molten resin flows in the mold according to the present embodiment
- the molten resin is introduced into the cavity 51 of the first mold and the cavity 81 of the second mold through the sprue 22, the runner 12, and the gate 13.
- the cavity 51 of the first mold and the cavity 81 of the second mold have a substantially cylindrical shape.
- the molten resin is introduced into the cavity 51 of the first mold and the cavity 81 of the second mold through one runner 12 because the runner 12 is branched.
- the present invention is not limited to this, and a structure in which the first mold and the second mold are separated may be used. That is, as shown in FIG. 2B, the molten resin is introduced into the first mold cavity 51 through the first mold sprue 22a and the runner 12a, and the second mold sprue 22b and A structure in which molten resin is introduced into the cavity 81 of the second mold through the runner 12b may be used.
- a two-piece mold may be used in which the runner 12a is branched to introduce the molten resin into the cavities 51 of the plurality of first molds.
- the second mold may be a common mold.
- the resin molding die 1 of the present embodiment includes the first mold and the second mold, but is not limited thereto, and the resin molding mold including only the first mold, A resin mold having only two molds may be used.
- FIG. 3A and 3B are schematic views of the tube 90 according to the present embodiment, in which FIG. 3A is a perspective view, FIG. 3B is a partial side view, and FIG. 3C is a view taken along line aa in FIG. It is sectional drawing.
- the tube 90 has a thick portion 91 and a hollow portion 92, and a reinforcing member 93 is embedded in the thick portion 91.
- FIG. 3 illustrates a tube 90 in which a reinforcing member 93 as a helical member (coil, plate spring) composed of a plurality of spiral portions is embedded in a thickness portion 91.
- a reinforcing member as a helical member composed of at least one spiral or at least one annular member (including a ring and a cylindrical member) is embedded in a portion to be reinforced. It may be a tube.
- the reinforcing members as the plurality of annular members may be tubes that are embedded side by side in the axial direction of the tube 90 at a predetermined pitch similar to that of the plurality of spiral portions of the reinforcing member 93.
- the reinforcing member may be a member in which a spiral member and an annular member are combined.
- the tube 90 includes the reinforcing member 93, it is difficult to bend even when a force is applied from the outside, and the hollow portion 92 can be prevented from being narrowed.
- the resin molding die 1 which can be used suitably in order to manufacture said tube 90 is demonstrated.
- the resin molding die 1 of this embodiment includes a first die 50 and a second die 80.
- FIG. 4A and 4B are schematic views of the first mold 50 according to the present embodiment, in which FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along line AA in FIG. ) Is a cross-sectional view taken along line BB in (a), and (d) is an enlarged view of a portion C in (b). Further, in FIG. 4C, the configuration of each part is shown enlarged for explanation.
- the above-described primary molding lower mold 30 and primary molding upper mold 40 constituting the first mold 50 are cavity molds.
- a substantially cylindrical cavity 51 is formed as a hollow portion of the first mold 50.
- the inner wall surface 52 of the first mold 50 includes the inner wall surface 31 of the lower mold 30 for primary molding and the inner wall surface 41 of the upper mold 40 for primary molding.
- FIG. 5A and 5B are schematic views of the second mold 80 according to the present embodiment, in which FIG. 5A is a plan view, FIG. 5B is a cross-sectional view taken along line DD in FIG. ) Is a cross-sectional view taken along line EE of (a).
- the above-described secondary molding lower mold 60 and secondary molding upper mold 70 constituting the second mold 80 are cavity molds.
- a substantially cylindrical cavity 81 is formed as a hollow portion of the second mold 80.
- the inner wall surface 82 of the second mold 80 includes an inner wall surface 61 of the lower mold for secondary molding 60 and an inner wall surface 71 of the upper mold for secondary molding 70.
- the diameter of the cavity 81 of the second mold 80 is larger than the diameter of the cavity 51 of the first mold 50. That is, the inner diameter of the second mold 80 is larger than the inner diameter of the first mold 50.
- die 50 here means the diameter of the cavity 51 except the hole-shaped recessed part 56 mentioned later. Further, the diameter of the cavity 81 of the second mold 80 is equal to or larger than the diameter of the cavity 51 of the first mold 50 including the hole-shaped recess 56 described later.
- the inner wall surface 52 of the first mold 50 is provided with at least one hole-like recess 56.
- the hole-shaped recess 56 is one of a plurality of lines parallel to the axial direction of the cavity 51 on the inner wall surface 52 of the first mold 50. It is preferable that they are provided discretely (preferably regularly) along the line. Furthermore, it is preferable that a plurality of hole-shaped concave portions 56 are provided discretely along a line different from the one line among the plurality of lines.
- the number of lines different from the one line is preferably 2 or more, and is more preferably equiangularly arranged on the inner wall surface 52 with the center of the cavity 51 as a reference. Furthermore, it is more preferable to design the depth of the hole-shaped recess 56 so that the diameter of a virtual cylinder circumscribing the cavity 51 including the hole-shaped recess 56 is equal to the inner diameter of the second mold 80.
- the mold is attached to the vertical injection molding machine.
- the present invention is not limited to this, and the mold may be attached to the horizontal injection molding machine.
- the tube manufacturing method of the present embodiment includes a primary molding step (first step) and a secondary molding step (second step) as the injection molding step.
- a molten resin is first obtained by heating a molding material in an injection unit (not shown), similarly to conventional injection molding. Next, after injecting the molten resin into the clamped mold, the molten resin is cooled to obtain a molded product.
- the injection molding material general thermoplastic resins can be used, but considering the moldability and mechanical properties required for products from urethane resin, vinyl chloride resin, polyethylene resin, and other thermoplastic elastomer resins. Thus, it can be appropriately selected and used.
- the reinforcing member 93 and the core pin 4 as a slide core are disposed in the cavity 51 of the first mold 50.
- the reinforcing member 93 is disposed so as to cover the core pin 4, and the core pin 4 is disposed such that the central axis of the core pin 4 and the central axis of the cavity 51 are collinear.
- molten resin is injected into the cavity 51 of the first mold 50 in a state where the reinforcing member 93 and the core pin 4 are arranged in the cavity 51 as described above. At this time, the molten resin enters the hole-shaped recess 56 provided on the inner wall surface 52.
- tubular first resin layer tubular resin
- a primary molded body provided with the reinforcing member 93 provided is provided.
- a part of reinforcement member 93 may be exposed from the said outer peripheral surface of a tubular 1st resin layer, and does not need to be exposed.
- a primary molded object is shape
- the external shape becomes a shape corresponding to the shape of the inner wall of the 1st metal mold
- the primary molded body and the core pin 4 as a slide core are disposed in the cavity 81 of the second mold 80.
- the primary molded body and the core pin 4 are arranged so that the respective central axes are collinear with the central axis of the cavity 81.
- the core pin 4 used in the primary molding process may be replaced from the cavity 51 to the cavity 81, or another core pin may be used for the cavity 81.
- the inner diameter of the second mold 80 is larger than the inner diameter of the first mold 50, so that at least a part of the surface of the primary molded body and the second mold 80 There is a gap between the inner wall surface 82.
- molten resin is injected into the cavity 81 with the primary molded body and the core pin 4 disposed in the cavity 81 as described above.
- molten resin is injected into the cavity 81 with the primary molded body and the core pin 4 disposed in the cavity 81 as described above.
- the gap is filled with molten resin.
- the second resin layer is formed outside the first resin layer so as to cover the reinforcing member 93 exposed on the surface of the primary molded body by solidifying the molten resin.
- the tube 90 (refer FIG. 3) by which the reinforcement member 93 was embed
- the primary molded body When the primary molded body is disposed in the cavity 81, a gap is generated between the primary molded body and the inner wall surface 82 of the second mold 80, and therefore the primary molded body is deformed by its own weight or injection pressure, The primary molded body bends at the center portion of the second mold 80. As a result, there occurs an eccentricity in which the central axis of the primary molded body and the central axis of the tube completed through the secondary molding process do not coincide with each other. Therefore, in the longitudinal direction of the second mold 80, the distance between the inner wall surface 82 and the surface of the primary molded body becomes non-uniform, and as a result, the thickness of the manufactured tube becomes non-uniform. Furthermore, depending on the case, there may arise a problem that the reinforcing member is not embedded in the thickness portion and is exposed.
- the convex portion is formed on the surface of the primary molded body, when the primary molded body is disposed in the cavity 81 of the second mold 80, the primary molded body is Even if it is a case where it bends, when a convex part contacts the inner wall surface 82 of the 2nd metal mold
- the tube 90 with improved uniformity of the thickness of the thickness portion in the longitudinal direction can be manufactured.
- the primary molded body is arranged in the cavity 81 of the second mold 80 so that the convex portion of the primary molded body is in contact with the inner wall surface 82 of the second mold 80, at least in the peripheral region of the convex portion. Deviation between the center axis of the body and the center axis of the cavity 81 of the second mold 80 can be suppressed.
- the injection direction of the molten resin in the secondary molding process is such that the core pin 4
- the direction from the base to the tip may be used, or vice versa, the direction from the tip of the core pin 4 to the base may be used.
- the primary molded body is likely to be eccentric.
- the convex portion comes into contact with the inner wall surface 82 of the second mold 80, so that the eccentricity of the primary molded body is less likely to occur.
- the manufacturing method of the tube 90 using the first mold 50 in which the hole-like recess 56 is formed in the inner wall surface 52 has been described.
- the manufacturing method of the present embodiment is not limited to this,
- the first mold 50 in which the hole-shaped recess 56 is not formed in the inner wall surface 52 may be used. Even in this case, since the step of covering the tubular resin with the reinforcing member as in the manufacturing method of Patent Document 1 is unnecessary, the tube 90 including the reinforcing member 93 in the thickness portion 91 is manufactured by a simple process. can do.
- the reinforcing member 93 is disposed in the cavity 51 of the first mold 50 and injection molding is performed, there is no gap between the tubular resin and the reinforcing member 93. For this reason, the amount of molten resin required to cover the reinforcing member 93 in the secondary molding step may be smaller than the amount of liquid silicone rubber required in the manufacturing method of Patent Document 1. Thereby, the tube 90 in which the reinforcing member 93 is embedded in the thickness portion 91 can be manufactured without excessively increasing the outer diameter with respect to the inner diameter.
- the first resin layer is formed in the primary molding step, and the second resin layer is formed outside the first resin layer in the secondary molding step. Therefore, the thickness part 91 of the tube 90 is comprised by the 1st resin layer which is an inner layer, and the 2nd resin layer which is an outer layer.
- the reinforcing member 93 is formed along the boundary between the first resin layer and the second resin layer. That is, in the cross section when the tube 90 is cut along the plane including the axial direction of the tube 90 (the cross sectional view taken along the line bb in FIG. 3C), the cross section of the reinforcing member 93 is the first resin layer. And corresponding to the position of the boundary between the second resin layer.
- the first resin layer and the second resin layer may be formed of the same resin material, or may be formed of different resin materials that are compatible with each other.
- the resin molding die 1 which can be used suitably in order to manufacture the tube 90 shown in FIG. 3 is demonstrated.
- the resin molding die 1 of the present embodiment includes a first die 150 and a second die 80 (see FIG. 5).
- FIG. 6A and 6B are schematic views of the first mold 150 according to the present embodiment, where FIG. 6A is a plan view, FIG. 6B is a cross-sectional view taken along line FF in FIG. ) Is a cross-sectional view taken along line GG in (a), and (d) is an enlarged view of an H portion in (b). Moreover, in FIG.6 (c), the structure of each part is expanded and shown for description.
- a substantially cylindrical cavity 151 of the first mold 150 is formed by clamping the lower primary mold 130 and the upper primary mold 140 for primary molding. Further, the inner wall surface 152 of the first mold 150 includes the inner wall surface 131 of the primary mold lower mold 130 and the inner wall surface 141 of the primary mold upper mold 140.
- a hole-shaped recess 156 is provided on the inner wall surface 152 of the first mold 150.
- the hole-shaped recess 156 includes a first hole-shaped recess 154 and a second hole-shaped recess 155 provided on a part of the bottom surface of the first hole-shaped recess 154.
- the hole-shaped recess 156 has a plurality of step surfaces in the depth direction, and the bottom surface of the first hole-shaped recess 154 constitutes the shallowest step surface of the hole-shaped recess 156.
- the bottom surface of the two-hole concave portion 155 constitutes the deepest bottom surface of the hole-shaped concave portion 156.
- the inner surface of the hole-shaped recess 156 is formed in a step shape. Therefore, the area of the bottom surface of the second hole-shaped recess 155 is smaller than the opening area of the hole-shaped recess 156 in plan view.
- the size of the second hole-shaped recess 155 in plan view is preferably small, for example, 1 mm ⁇ 1 mm.
- a plurality of second hole-shaped recesses 155 may be provided on the first hole-shaped recess 154.
- the reinforcing member 93 and the core pin 4 are disposed in the cavity 151 of the first mold 150, as in the manufacturing method of the first embodiment.
- the reinforcing member 93 is disposed so as to cover the core pin 4, and the core pin 4 is disposed such that the central axis of the core pin 4 and the central axis of the cavity 151 are collinear.
- molten resin is injected into the cavity 151 of the first mold 150 with the reinforcing member 93 and the core pin 4 disposed in the cavity 51 as described above. At this time, the molten resin enters the hole-shaped recess 156 provided on the inner wall surface 152. More specifically, the molten resin enters the first hole-shaped recess 154 and the second hole-shaped recess 155.
- the molten resin is cooled and solidified, thereby forming a tubular first resin layer (tubular resin) having a convex portion corresponding to the hole-shaped concave portion 156 on the surface, and an outer peripheral surface of the first resin layer.
- a primary molded body provided with the reinforcing member 93 provided is provided. Since the hole-shaped concave portion 156 includes the first hole-shaped concave portion 154 and the second hole-shaped concave portion 155, the primary molded body has, as a convex portion, a lower-stage convex portion corresponding to the first hole-shaped concave portion 154, and An upper convex portion corresponding to the second hole-shaped concave portion 155 is formed.
- the lower convex portion constitutes the bottom of the convex portion
- the upper convex portion constitutes the top of the convex portion.
- the primary molded body and the core pin 4 are arranged in the cavity of the second mold 80 as in the manufacturing method of the first embodiment.
- molten resin is injected into the cavity 81 of the second mold 80 in a state where the primary molded body and the core pin 4 are arranged in the cavity 81 as described above.
- the second resin layer is formed outside the first resin layer so as to cover the reinforcing member 93 exposed on the surface of the primary molded body by solidifying the molten resin.
- the tube 90 in which the reinforcing member 93 is embedded in the thickness portion 91 can be manufactured by the primary forming process and the secondary forming process described above.
- FIG. Therefore, the tube 90 with improved uniformity of the thickness of the thickness portion in the longitudinal direction can be manufactured.
- the injected molten resin does not reach the upper surface of the convex portion.
- the top surface is not covered with molten resin.
- an exposed portion (corresponding to the convex portion) where the primary molded body is exposed on the surface of the tube 90 and a covering portion (corresponding to other than the convex portion) covered with the molten resin in the injection process of the secondary molding step.
- the aesthetic appearance of the tube 90 may be impaired.
- the protrusion on the outer surface of the primary molded body has a lower protrusion corresponding to the first hole-shaped recess 154 and a second hole-shaped recess. It has an upper convex part corresponding to the concave part 155. Since the area of the bottom surface of the second hole-shaped recess 155 is smaller than the opening area of the hole-shaped recess 156 in plan view, the area of the upper surface of the upper protrusion is smaller than the area of the bottom surface of the protrusion.
- the area of the upper surface of the upper protrusion on the outer surface of the primary molded body is smaller than the area of the upper surface of the protrusion when the upper protrusion is not included.
- the area of the portion in contact with the inner wall surface 82 of the second mold 80 is smaller than when the convex portion does not include the upper convex portion. Therefore, the boundary line between the exposed portion and the covering portion becomes a small substantially round shape, and the boundary line can be made difficult to be visually recognized on the surface of the tube 90. Therefore, the aesthetic appearance of the tube 90 can be improved when the second hole-shaped recess 155 is provided in the first mold 250 than when the second mold-like recess 155 is not provided.
- the configuration in which the hole-shaped recess 156 includes the first hole-shaped recess 154 and the second hole-shaped recess 155 is described, but the configuration of the hole-shaped recess 156 is not limited to this.
- the hole-shaped concave portion 156 does not include the second hole-shaped concave portion 155, it is only necessary that the area of the bottom surface is smaller than the opening area.
- the shape of the hole-shaped recess 156 may be a shape whose width decreases toward the bottom, such as a cone shape or a dome shape. Thereby, the shape of the convex part formed in a primary molded object becomes thin toward the front-end
- the aesthetic appearance of the tube 90 can be improved compared to the aspect in which the area of the bottom surface of the hole-shaped recess 156 is equal to the opening area.
- the resin molding die 1 of the present embodiment includes a first die 250 and a second die 80 (see FIG. 5).
- FIG. 7A and 7B are schematic views of the first mold 250 according to the present embodiment, in which FIG. 7A is a plan view, FIG. 7B is a cross-sectional view taken along line II in FIG. ) Is a cross-sectional view taken along line JJ in (a), and (d) is an enlarged view of a portion K in (b).
- FIG. 7A for the sake of explanation, grooves formed on the inner wall surface of the first mold 250 are shown.
- FIG.7 (c) the structure of each part is expanded and shown for description.
- a substantially cylindrical cavity 251 of the first mold 250 is formed by clamping the lower primary mold 230 and the upper primary mold 240 for primary molding. Further, the inner wall surface 252 of the first mold 250 includes the inner wall surface 231 of the lower primary mold 230 and the inner wall surface 241 of the upper primary mold 240.
- the inner wall surface 231 and the inner wall surface 241 are provided with grooves according to the shape of the reinforcing member 93.
- the grooves 253 a and 253 b of the inner wall surface 231 and the inner wall surface 241 are combined to form a groove 253 corresponding to the spiral shape of the reinforcing member 93 on the inner wall surface 252 of the first mold 250.
- a hole-shaped recess 256 is further provided on the inner wall surface 252 of the first mold 250.
- the hole-shaped recess 256 is provided so as to include at least a part of the region between the adjacent grooves 253.
- the depth of the hole-like recess 256 is deeper than the depth of the groove 253.
- the hole-shaped recess 256 includes a first hole-shaped recess 254 and a second hole-shaped recess 255 provided in a part of the bottom surface of the first hole-shaped recess 254.
- the hole-shaped recess 256 may be provided so as to fit between adjacent grooves 253, or may be provided so as to cover (straddle) two or more adjacent grooves 253.
- the shape of the groove is a spiral shape
- the shape is not limited to this, and the shape of the groove can be appropriately changed according to the shape of the reinforcing member.
- the shape of the grooves may be a shape in which a plurality of annular or plurality of cylindrical grooves are arranged at equal intervals or in a controlled unequal pitch in a direction parallel to the central axis of the cavity.
- a shape obtained by arbitrarily selecting and combining two or more shapes from an annular shape and a cylindrical shape may be used.
- the hole-shaped concave portion is arbitrarily selected from a spiral portion corresponding to one turn of the spiral groove, an annular portion corresponding to one of the annular grooves, and a cylindrical portion corresponding to one of the cylindrical grooves. You may provide including the at least one part area
- the inner wall surface 252 has a hole-like recess 256 portion.
- the groove 253 is interrupted, even in this case, the hole-like concave portion 256 is assumed to include at least a part of the region between the adjacent grooves 253.
- the groove 253 has a spiral shape in which a single spiral portion is continuously wound, as is apparent from the sectional view shown in FIG. 7D, the central axis of the cavity 251 on the inner wall surface 252 A plurality of intersecting portions 257 intersecting with a line parallel to. And the hole-shaped recessed part 256 is provided including the area
- the size of the second hole-shaped recess 255 in plan view is preferably small, for example, preferably 1 mm ⁇ 1 mm.
- a plurality of second hole-shaped recesses 255 may be provided on the first hole-shaped recess 254.
- the 2nd hole-shaped recessed part 255 is not an essential structure.
- the plurality of hole-shaped recesses 256 are formed on the inner wall surface 252 of the first mold 250, among the plurality of lines parallel to the axial direction of the cavity 251. It is provided discretely (preferably regularly) along one line. Further, among the plurality of lines, a plurality of hole-shaped recesses 256 are discretely provided along a line different from the one line.
- the number of lines different from the one line is preferably 2 or more, and is equiangularly arranged on the inner wall surface 252 on the circumference of the cavity 251 with the center of the cavity 251 as a reference. More preferred.
- the reinforcing member 93 and the core pin 4 are disposed in the cavity 251 of the first mold 250, as in the manufacturing method of the first embodiment.
- the reinforcing member 93 is disposed so as to be fitted into the groove 253, and the core pin 4 is disposed such that the central axis of the core pin 4 and the central axis of the cavity 51 are collinear.
- molten resin is injected into the cavity 251 of the first mold 250 in a state where the reinforcing member 93 and the core pin 4 are arranged in the cavity 251 as described above. At this time, the molten resin enters the hole-like recess 256 provided on the inner wall surface 252.
- tubular resin tubular resin having a convex portion corresponding to the hole-shaped concave portion 256, and a reinforcing member 93 provided along the outer peripheral surface of the first resin layer.
- the hole-shaped recess 256 is provided so as to include a region between the intersecting portions 257 adjacent to each other, the projecting portion intersects the spiral reinforcing member 93 and a line parallel to the central axis of the primary molded body. It is provided including a region between two intersections. In other words, the convex portion is provided so as to include an area between the two spiral portions.
- the depth of the hole-shaped concave portion 256 is deeper than the depth of the groove 253, the top portion of the convex portion is located on the surface of the primary molded body so as to protrude outward from the outer peripheral surface of the reinforcing member 93.
- die 250 is provided so that it may overlap with 2 or more adjacent groove
- the hole-shaped recess 256 of the first mold 250 is provided so as to include a region between two adjacent grooves 253, the first mold 250 protrudes so as to include a region between two continuous spiral portions. A primary molded body in which a portion is formed can be obtained.
- the molten resin is injected into the first mold 250 through the gate 13 and poured from one end of the first mold 250 to the other end. Therefore, the reinforcing member 93 receives an injection pressure in the direction from one end of the first mold 250 to the other end. In injection molding using a conventional mold, the reinforcing member may move in the cavity due to the influence of injection pressure.
- the primary molding step since the reinforcing member 93 is fitted in the groove 253, the movement of the reinforcing member 93 due to the influence of the injection pressure can be suppressed. Thereby, the primary molded object in which the reinforcement member 93 was provided appropriately in the position planned to be arranged outside the first resin layer can be obtained.
- the primary molded body and the core pin 4 are arranged in the cavity of the second mold 80 as in the manufacturing method of the first embodiment.
- molten resin is injected into the cavity 81 of the second mold 80 in a state where the primary molded body and the core pin 4 are arranged in the cavity 81 as described above.
- the second resin layer is formed outside the first resin layer so as to cover the reinforcing member 93 exposed on the surface of the primary molded body by solidifying the molten resin.
- the tube 90 in which the reinforcing member 93 is embedded in the thickness portion 91 can be manufactured by the primary forming process and the secondary forming process described above.
- the molten resin is poured from one end of the second mold 80 provided with the gate 13 to the other end. Therefore, the reinforcing member 93 receives an injection pressure in a direction from one end of the second mold 80 toward the other end. In injection molding using a conventional mold, the reinforcing member may move in the cavity by receiving the injection pressure of the molten resin.
- the convex portion is provided so as to include the region between the two spiral portions included in the reinforcing member 93, the reinforcing member in the axial direction of the primary molded body
- the movement of 93 is limited by the convex part, and the movement of the reinforcing member 93 due to the influence of the injection pressure can be suppressed.
- the groove 253 suppresses the displacement of the reinforcing member 93 due to the injection pressure. Furthermore, in the secondary molding step, the positional displacement of the reinforcing member 93 due to the injection pressure is The convex part formed including the area
- the convex portion comes into contact with the inner wall surface 82 of the second mold 80, whereby the primary molding is performed. It is possible to reduce the eccentricity of the body in the cavity 81. Thereby, in the longitudinal direction of the 2nd metal mold
- the injected molten resin does not reach the upper surface of the convex portion.
- the top surface is not covered with molten resin.
- an exposed portion (corresponding to the convex portion) where the primary molded body is exposed on the surface of the tube 90 and a covering portion (corresponding to other than the convex portion) covered with the molten resin in the injection process of the secondary molding step.
- the aesthetic appearance of the tube 90 may be impaired.
- the protrusions are a lower protrusion corresponding to the first hole-shaped recess 254 and an upper protrusion corresponding to the second hole-shaped recess 255.
- the area of the bottom surface of the second hole-shaped recess 255 is smaller than the opening area of the hole-shaped recess 256 in a plan view
- the area of the upper surface of the upper protrusion is smaller than the area of the bottom of the protrusion. For this reason, the area of the upper surface of the upper protrusion is smaller than the area of the upper surface of only the lower protrusion when the upper protrusion is not included.
- the convex portion does not include the upper convex portion
- the area of the portion of the primary molded body that contacts the inner wall surface 82 of the second mold 80 becomes smaller. Therefore, the boundary line between the exposed portion and the covering portion becomes a small substantially round shape, and the boundary line can be made difficult to be visually recognized on the surface of the tube 90. Therefore, the aesthetic appearance of the tube 90 can be improved when the second hole-shaped recess 255 is provided in the first mold 250 than when the second mold-like recess 255 is not provided.
- the first resin layer is formed in the primary molding step, and the second resin layer is formed outside the first resin layer in the secondary molding step. Therefore, as described with reference to FIG. 3, the thickness portion 91 of the tube 90 includes a first resin layer that is an inner layer and a second resin layer that is an outer layer.
- the reinforcing member 93 is formed along the boundary between the first resin layer and the second resin layer. That is, in the cross section when the tube 90 is cut along the plane including the axial direction of the tube 90, the cross section of the reinforcing member 93 is arranged corresponding to the position of the boundary between the first resin layer and the second resin layer. Yes.
- the groove 253 provided on the inner wall surface 252 of the first mold 250 is used. And a convex portion ( ⁇ ) corresponding to the hole-shaped concave portion 256 are formed. As described above, the convex portion ( ⁇ ) is provided including the region between the spiral portions of the spiral reinforcing member 93.
- the second resin layer covering the convex portion ( ⁇ ) has a convex portion.
- a recess ( ⁇ ) corresponding to ( ⁇ ) is generated.
- a concave portion ( ⁇ ) corresponding to the convex portion ( ⁇ ) is generated in the second resin layer covering the convex portion ( ⁇ ) provided including at least a region between the pair of spiral portions. That is, since the thickness of the first resin layer (second resin layer) is different between the region between the two continuous spirals and the region of the other part, a step is formed between the two regions.
- the thickness of the first resin layer is thicker than the thickness portion of the other first resin layer, and the thickness of the second resin layer is the other second. It is thinner than the thickness part of the resin layer.
- the second resin layer is provided around the primary molded body composed of the first resin layer and the reinforcing member 93.
- the convex portion ( ⁇ ) comes into contact with the inner wall surface 82 of the second mold 80, The bending (eccentricity) of the primary molded body can be reduced.
- a tube 90 can be provided.
- the tube 90 has a structure in which the reinforcing member 93 is provided at a position where the reinforcing member 93 is to be arranged by suppressing the displacement of the reinforcing member 93 by the convex portion ( ⁇ ) corresponding to the groove 253. .
- the portion to be reinforced can be reinforced, and the tube 90 that is not easily bent can be provided.
- the structure in which the reinforcing member 93 is reliably provided at the position where the reinforcing member 93 is to be arranged by further suppressing the displacement of the reinforcing member 93 by the convex portion ( ⁇ ) corresponding to the hole-like concave portion 256 is provided in the tube 90.
- the portion to be reinforced can be reinforced with higher accuracy, and the tube 90 that is not easily bent can be provided.
- a two-component curable silicone resin or a two-component curable urethane resin can be employed as a resin used for vacuum casting.
- the curing reaction type may be either a condensation reaction type or an addition reaction type, but an addition reaction type (a type that can accelerate the curing reaction by heating) with a small weight shrinkage due to curing is a two-part curable resin. preferable.
- the mold having the same structure as each resin molding mold 1 used in the injection molding described in the first to third embodiments can be used.
- the tube manufacturing method of the present embodiment also includes a primary molding step (first step) and a secondary molding step (second step) as the vacuum casting step, as in the above-described injection molding step.
- the mold In the primary molding process, the mold is placed in the vacuum chamber of the vacuum casting apparatus, and the main component of the two-part curable silicone rubber (resin) prepared in advance and the curing agent are mixed, and the same structure as the resin molding mold 1
- the vacuum chamber After injecting from the sprue into the first mold (core pin already disposed), the vacuum chamber is decompressed to a vacuum state. Thereby, defoaming for removing air contained in the resin injected into the first mold is performed.
- the vacuum chamber is opened to atmospheric pressure, the resin is pushed into the cavity and filled, and the curing reaction progresses to a predetermined shape.
- Tube primary molded body
- a temperature raising device can be attached to the mold or the vacuum chamber to accelerate the curing of the resin after injection.
- the heating temperature at this time varies depending on the resin material, but is, for example, 60 ° C. to 80 ° C.
- the primary molded body and the core pin are arranged in the cavity of the second mold having the same structure as that of the resin molding mold 1 and vacuum casting is performed in the same manner as above to obtain a final molded product.
- Tube can be manufactured.
- a method of manufacturing a tube according to one aspect of the present invention includes a thickness portion and a hollow portion, and includes an annular, cylindrical, or spiral reinforcing member in the thickness portion.
- a method of manufacturing a tube wherein the reinforcing member and a core pin for forming the cavity portion are disposed in a cavity of a first mold, and resin molding is performed along the outer peripheral surface of the tubular resin.
- the primary molded body is disposed in a first step of molding the primary molded body provided with the reinforcing member and a cavity of a second mold having an inner diameter larger than the inner diameter of the first mold. And a second step of covering the reinforcing member by resin molding.
- the primary molded body provided with the reinforcing member along the outer peripheral surface of the tubular resin can be molded.
- the reinforcing member provided along the outer peripheral surface of the tubular resin can be covered.
- the annular or spiral reinforcement member is provided in the thickness portion, and a tube that is not easily bent can be manufactured.
- a tube having an annular or spiral reinforcing member in the thickness portion can be manufactured by a simple process.
- the inner diameter of the reinforcing body is designed to be larger than the outer diameter of the silicone rubber tube.
- the manufactured tube has a problem that the outer diameter becomes excessively large with respect to the inner diameter.
- the reinforcing member is disposed in the cavity of the first mold and resin molding is performed, there is no gap between the tubular resin and the reinforcing member.
- the reinforcing member can be accurately arranged with respect to the radial direction of the primary molded body, and therefore, it is possible to eliminate the surplus space that assumes the amount of displacement of the reinforcing member with respect to the radial direction. Therefore, it is possible to manufacture a tube in which a reinforcing member is embedded in a thin thickness portion.
- the cylindrical reinforcing member can be suitably used as long as the schematic shape is an approximately cylindrical elastic body.
- Various forms can be employed.
- the thickness and pitch of the reinforcing member the ease of bending the tube and the flatness of the tube cross section can be controlled.
- a hole-shaped recess may be provided on the inner wall surface of the first mold.
- the convex portion corresponding to the hole-shaped concave portion of the first mold is formed on the surface of the primary molded body. And when a primary molded object is arrange
- each of the plurality of lines on the inner wall surface of the first mold is parallel to the axial direction of the cavity of the first mold. It is preferable to form a hole-shaped recess. Further, it is more preferable to discretely provide a plurality of hole-shaped concave portions on each line, and it is more preferable to provide them regularly. More preferably, the plurality of lines are equiangularly arranged on the inner wall surface on the circumference of the cavity with reference to the center of the cavity of the first mold.
- the diameter of the virtual cylinder circumscribing the cavity shape of the first mold may be equal to the inner diameter of the second mold.
- the diameter of the virtual cylinder circumscribing the primary molded body is equal to the inner diameter of the second mold. Therefore, when the primary molded body is disposed in the cavity of the second mold so that the convex portion of the primary molded body is in contact with the inner wall surface of the second mold, the central axis of the primary molded body is at least in the peripheral region of the convex portion. And the center axis of the cavity of the second mold can be suppressed. As a result, bending of the primary molded body can be suppressed.
- the resin molding of the second step is performed in a state where the convex portion of the primary molded body is in contact with the inner wall surface of the second mold, the resin introduced by the resin introducing step of the second step reaches the upper surface of the convex portion. Therefore, the upper surface of the convex portion is not covered with resin. As a result, an exposed portion (corresponding to the convex portion) where the primary molded body is exposed and a covering portion (corresponding to other than the convex portion) coated with the resin in the injection process of the second step are formed on the surface of the tube. Is done. As a result, the boundary line between the exposed portion and the covering portion is visually recognized on the surface of the tube, which is not preferable in appearance.
- the hole-shaped recess has a plurality of step surfaces in the depth direction, and includes a first hole-shaped recess and a second hole-shaped recess.
- the bottom surface of the first hole-shaped recess constitutes the shallowest step surface of the hole-shaped recess
- the bottom surface of the second hole-shaped recess forms the deepest bottom surface of the hole-shaped recess. Therefore, the inner surface of the hole-shaped recess is formed in a stepped shape, and the area of the bottom surface of the second hole-shaped recess is smaller than the opening area of the hole-shaped recess in plan view. Also good.
- a convex part is formed in the surface of a primary molded object, and a convex part is a convex part (henceforth a lower step convex part) located in the lower stage corresponding to a 1st hole-shaped recessed part. ) And a convex portion (hereinafter referred to as an upper convex portion) positioned relatively on the upper stage corresponding to the second hole-shaped concave portion.
- the bottom surface of the first hole-shaped concave portion constitutes the shallowest step surface of the hole-shaped concave portion, and the bottom surface of the second hole-shaped concave portion constitutes the deepest bottom surface of the hole-shaped concave portion.
- a bottom part is comprised and an upper stage convex part comprises the uppermost part of a convex part.
- the area of the upper surface of the upper protrusion is smaller than the area of the bottom surface of the protrusion. That is, the area of the upper surface of the upper protrusion is smaller than the area of the upper surface of the protrusion when the upper protrusion is not included.
- the area of the portion of the primary molded body that contacts the inner wall surface of the second mold becomes smaller.
- the length of the boundary line between the exposed portion and the covering portion is shortened (for example, the boundary line is a small round shape), and the boundary line can be hardly seen on the surface of the tube. Therefore, the aesthetic appearance of the completed tube can be improved when the second hole-shaped recess is provided in the mold, compared with the case where it is not provided.
- the convex part formed in the surface of a primary molded object is not restricted to the structure which consists of two steps, a lower step convex part and an upper step convex part, The structure of three steps or more may be sufficient. Even in this case, the top surface area of the top of the multi-stage protrusion (upper convex part) is smaller than the area of the bottom surface of the bottom protrusion (lower convex part), or the top of the multi-stage protrusion is It only needs to be smaller than the protrusion.
- the hole-shaped concave portion may further include a third hole-shaped concave portion in addition to the first hole-shaped concave portion and the second hole-shaped concave portion.
- a third hole-shaped recess may be provided in a part of the bottom surface of the first hole-shaped recess
- a second hole-shaped recess may be provided in a part of the bottom surface of the third hole-shaped recess.
- a mold according to an aspect of the present invention includes a thickness portion and a hollow portion, and includes an annular, cylindrical, or spiral reinforcing member in the thickness portion.
- a mold for forming a tube which includes a first mold and a second mold, and an inner diameter of the second mold is larger than an inner diameter of the first mold, and the first mold
- the inner wall surface is provided with a plurality of hole-shaped recesses.
- a primary molded body in which convex portions corresponding to the hole-shaped concave portions of the first mold are formed on the surface is obtained by resin molding using the first mold. And when a primary molded object is arrange
- a tube includes a thickness portion and a hollow portion, and at least one annular member or cylindrical member, or at least one winding in the thickness portion.
- the thickness of the first resin layer is thicker than that of the other first resin layer, and the thickness of the second resin layer is thinner than that of the other second resin layer.
- the thickness of the 1st resin layer becomes a convex part thicker than another part in at least a certain part of a tube.
- the present invention can be used for applications in which it is desired to suppress the hollow portion of the tube from being narrowed by bending, for example, a medical tube.
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Abstract
Description
以下、本発明の実施の形態に係るチューブの製造方法、チューブ、および金型について、図1~5に基づいて詳細に説明する。
図1は、本実施形態に係る樹脂成形金型1の一部の斜視図であり、(a)は樹脂受入側金型と対向側金型とを対向させた状態を示し、(b)は対向側金型を示し、(c)は樹脂受入側金型を示す。
図3は、本実施形態に係るチューブ90の概略図であり、(a)は斜視図であり、(b)は部分側面図であり、(c)は(b)のa-a線矢視断面図である。チューブ90は、厚み部91と空洞部92とを有しており、厚み部91内に補強部材93が埋設されている。
以下に、図4および図5を参照して、上記のチューブ90を製造するために好適に用いることができる樹脂成形金型1について説明する。本実施形態の樹脂成形金型1は、第1金型50と、第2金型80とを含んでいる。
以下に、上記の樹脂成形金型1を用いてチューブ90を製造する製造方法について説明する。本実施形態のチューブの製造方法は、射出成形工程として、一次成形工程(第1工程)と二次成形工程(第2工程)とを含んでいる。
一次成形工程では、第1金型50のキャビティ51に、補強部材93と、スライドコアとしての中子ピン4とを配置する。このとき、補強部材93を、中子ピン4に被せるように配置し、中子ピン4を、中子ピン4の中心軸とキャビティ51の中心軸とが同一線をなすように配置する。
二次成形工程では、第2金型80のキャビティ81に、一次成形体と、スライドコアとしての中子ピン4とを配置する。このとき、一次成形体および中子ピン4を、それぞれの中心軸がキャビティ81の中心軸と同一線をなすように配置する。なお、一次成形工程で用いた中子ピン4をキャビティ51からキャビティ81に挿し替えてもよいし、キャビティ81のために他の中子ピンを用いてもよい。
上記の製造方法では、一次成形工程において第1樹脂層を形成し、二次成形工程において第1樹脂層の外側に第2樹脂層を形成する。そのため、チューブ90の厚み部91は、内側の層である第1樹脂層と外側の層である第2樹脂層とによって構成されている。
以下、本発明の実施の形態に係るチューブの製造方法、および金型について、図6に基づいて詳細に説明する。なお、説明の便宜上、前記実施形態で説明した構成と同じ構成には、同じ番号を付し、その説明を省略する。
以下に、図3に示すチューブ90を製造するために好適に用いることができる樹脂成形金型1について説明する。本実施形態の樹脂成形金型1は、第1金型150と、第2金型80(図5参照)とを含んでいる。
(一次成形工程)
一次成形工程では、実施形態1の製造方法と同様に、第1金型150のキャビティ151に、補強部材93と、中子ピン4(図1参照)とを配置する。このとき、補強部材93を、中子ピン4に被せるように配置し、中子ピン4を、中子ピン4の中心軸とキャビティ151の中心軸とが同一線をなすように配置する。
二次成形工程では、実施形態1の製造方法と同様に、第2金型80のキャビティに、一次成形体と、中子ピン4とを配置する。次に、上記のようにキャビティ81に一次成形体および中子ピン4を配置した状態で、第2金型80のキャビティ81に溶融樹脂を射出する。
以下、本発明の実施の形態に係るチューブの製造方法、および金型について、図7に基づいて詳細に説明する。なお、説明の便宜上、前記実施形態で説明した構成と同じ構成には、同じ番号を付し、その説明を省略する。
以下に、チューブ90を製造するために好適に用いることができる射出成形金型1について説明する。本実施形態の樹脂成形金型1は、第1金型250と、第2金型80(図5参照)とを含んでいる。
(一次成形工程)
一次成形工程では、実施形態1の製造方法と同様に、第1金型250のキャビティ251に、補強部材93と、中子ピン4(図1参照)とを配置する。このとき、補強部材93を、溝253に嵌め込むように配置し、中子ピン4を、中子ピン4の中心軸とキャビティ51の中心軸とが同一線をなすように配置する。
二次成形工程では、実施形態1の製造方法と同様に、第2金型80のキャビティに、一次成形体と、中子ピン4とを配置する。次に、上記のようにキャビティ81に一次成形体および中子ピン4を配置した状態で、第2金型80のキャビティ81に溶融樹脂を射出する。
上記の製造方法では、一次成形工程において第1樹脂層を形成し、二次成形工程において第1樹脂層の外側に第2樹脂層を形成する。そのため、図3を参照して説明したように、チューブ90の厚み部91は、内側の層である第1樹脂層と外側の層である第2樹脂層とによって構成されている。
実施形態1から3において説明した射出成形法による樹脂成形に代えて、真空注型法による樹脂成形を採用することができる。真空注型を行うために用いる真空注型装置の一構成例は、前掲の特許文献3(特開2007-136713号公報)に開示されている。
金型には、実施形態1から3で説明した、射出成形に用いた各樹脂成形金型1と同じ構造の金型を用いることができる。
本実施形態のチューブの製造方法もまた、前述した射出成形工程と同じく、真空注型工程として、一次成形工程(第1工程)と二次成形工程(第2工程)とを含んでいる。
〔まとめ〕
上記の課題を解決するために、本発明の一態様に係るチューブの製造方法は、厚み部と空洞部とを備えており、上記厚み部内に環状、筒状または螺旋状の補強部材を備えたチューブの製造方法であって、第1金型のキャビティに、上記補強部材と、上記空洞部を形成するための中子ピンとを配置して樹脂成形をすることによって、管状樹脂の外周面に沿って上記補強部材が設けられた一次成形体を成形する第1工程と、上記第1金型の内径よりも大きな内径を有している第2金型のキャビティに、上記一次成形体を配置して樹脂成形をすることによって、上記補強部材を被覆する第2工程と、を含むことを特徴とする。
30 一次成形用下型
50、150、250 第1金型
51、151、251 キャビティ
52、152、252 内壁面
80 第2金型
81 キャビティ
90 チューブ
91 厚み部
92 空洞部
93 補強部材
56、156、256 孔状凹部
154、254 第1孔状凹部
155、255 第2孔状凹部
Claims (8)
- 厚み部と空洞部とを備えており、上記厚み部内に環状、筒状または螺旋状の補強部材を備えたチューブの製造方法であって、
第1金型のキャビティに、上記補強部材と、上記空洞部を形成するための中子ピンとを配置して樹脂成形をすることによって、管状樹脂の外周面に沿って上記補強部材が設けられた一次成形体を成形する第1工程と、
上記第1金型の内径よりも大きな内径を有している第2金型のキャビティに、上記一次成形体を配置して樹脂成形をすることによって、上記補強部材を被覆する第2工程と、を含むこと
を特徴とするチューブの製造方法。 - 第1金型の内壁面には、孔状凹部が設けられていること
を特徴とする請求項1に記載のチューブの製造方法。 - 上記第1金型のキャビティ形状に外接する仮想的な円柱の直径は、上記第2金型の内径に等しいこと
を特徴とする請求項2に記載のチューブの製造方法。 - 上記樹脂成形は射出成形である請求項1から請求項3のいずれか1項に記載のチューブの製造方法。
- 上記樹脂成形は真空注型である請求項1から請求項3のいずれか1項に記載のチューブの製造方法。
- 上記孔状凹部は、深さ方向に複数の段面を有しているとともに、第1孔状凹部と、第2孔状凹部とを含んでおり、
上記第1孔状凹部の底面は、上記孔状凹部の最も浅い段面を構成しており、
上記第2孔状凹部の底面は、上記孔状凹部の最も深い底面を構成していることによって、
上記孔状凹部の内面は、階段状に形成されており、
かつ、上記第2孔状凹部の上記底面の面積は、平面視における上記孔状凹部の開口面積よりも小さいこと
を特徴とする請求項2または3に記載のチューブの製造方法。 - 厚み部と空洞部とを備えており、上記厚み部内に環状、筒状または螺旋状の補強部材を備えたチューブを成形するための金型であって、
第1金型と第2金型とを含み、
上記第2金型の内径は、上記第1金型の内径よりも大きく、
上記第1金型の内壁面には、複数の孔状凹部が設けられていること
を特徴とする金型。 - 厚み部と空洞部とを備え、かつ上記厚み部内に少なくとも1つの環状部材または筒状部材、もしくは少なくとも1巻きの螺旋状部材としての補強部材を備えたチューブであって、
第1樹脂層と、上記第1樹脂層の外側に形成された第2樹脂層とを備えており、
上記チューブの軸方向を含む面で上記チューブを切断したときの断面において、上記補強部材の断面部は、上記第1樹脂層と第2樹脂層との境界の位置に対応して配されており、
上記チューブの少なくともある部分において、上記第1樹脂層の厚さが他の第1樹脂層の厚さ部分よりも厚く、上記第2樹脂層の厚さが他の第2樹脂層の厚さ部分よりも薄いこと
を特徴とするチューブ。
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US15/116,506 US20160354958A1 (en) | 2014-02-07 | 2015-02-04 | Tube, method for producing tube, and mold |
EP15746251.6A EP3103614B1 (en) | 2014-02-07 | 2015-02-04 | Method for producing a tube and moulding die |
JP2015561002A JP6534188B2 (ja) | 2014-02-07 | 2015-02-04 | チューブ、チューブの製造方法、及び金型 |
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EP (1) | EP3103614B1 (ja) |
JP (1) | JP6534188B2 (ja) |
TW (1) | TWI681857B (ja) |
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EP3238906A1 (en) * | 2016-04-26 | 2017-11-01 | Nakanishi Metal Works Co., Ltd. | Manufacturing method of insert molded article |
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CN107650341B (zh) * | 2017-09-29 | 2024-05-24 | 李金国 | 一种组合式结构模具 |
CH717820A1 (de) * | 2020-09-08 | 2022-03-15 | Integra Biosciences Ag | Schlauch zum Anbringen an einer Dispensierkassette zur Aufnahme in einer Peristaltikpumpe. |
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- 2015-02-04 US US15/116,506 patent/US20160354958A1/en not_active Abandoned
- 2015-02-04 EP EP15746251.6A patent/EP3103614B1/en not_active Not-in-force
- 2015-02-04 WO PCT/JP2015/053082 patent/WO2015119143A1/ja active Application Filing
- 2015-02-04 JP JP2015561002A patent/JP6534188B2/ja active Active
- 2015-02-05 TW TW104103857A patent/TWI681857B/zh not_active IP Right Cessation
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TW201540471A (zh) | 2015-11-01 |
EP3103614A4 (en) | 2017-10-04 |
US20160354958A1 (en) | 2016-12-08 |
JP6534188B2 (ja) | 2019-06-26 |
TWI681857B (zh) | 2020-01-11 |
EP3103614A1 (en) | 2016-12-14 |
JPWO2015119143A1 (ja) | 2017-03-23 |
EP3103614B1 (en) | 2018-05-16 |
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