JP2014054766A - Bent tube hose production method and hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bent tube hose production method in which versatility to a kind of a hose is high; and a hose.SOLUTION: A bent tube hose production method includes: a hose precursor making process that makes a hose precursor 2a including a shape retention layer 21 having a shape retention resin made shape retention material 210, and an unvulcanized state rubber made base layer 22a; a flexure shape imparting process in which a hose precursor 2a is bent, thereby a prescribed flexure shape is fixed to a shape retention layer 21, and a hose precursor 2a is imparted in a prescribed flexure shape; and a vulcanization process in which a hose precursor 2a is heated, thereby a base layer 22a is vulcanized to make a hose 2.

Description

  The present invention relates to a method for manufacturing a hose made of rubber and having a predetermined bent shape, and a hose.

  A hose having a predetermined bending shape is manufactured as follows. First, a release agent is applied to a metal mandrel having a bent shape. Next, the mandrel is heated. Subsequently, a mandrel is relatively inserted into the unvulcanized rubber hose precursor. Then, the hose precursor is heated and vulcanized to produce a hose. Thereafter, the mandrel is relatively extracted from the hose.

  However, the above manufacturing method has the following problems. That is, when a mandrel is inserted into the hose precursor, a mandrel with a bent shape is inserted into the straight hose precursor. For this reason, a large insertion resistance is generated. Therefore, in order to reduce insertion resistance, a release agent is applied to at least one of the outer peripheral surface of the mandrel and the inner peripheral surface of the hose precursor. In particular, when the heating of the mandrel is insufficient, the release agent adhesion to the mandrel is reduced. For this reason, a particularly large insertion resistance occurs. In addition, when a large insertion load is applied against the insertion resistance, scratches are formed in the hose precursor, resulting in poor appearance of the hose after completion. Moreover, when extracting a mandrel from a hose precursor, big extraction resistance will generate | occur | produce similarly to the case where a mandrel is inserted in a hose precursor. For this reason, a large extraction load is required. The insertion load and the extraction load become larger as the bending shape of the hose is complicated and as the hose becomes larger in diameter.

  As described above, the work of attaching and detaching the hose to and from the mandrel is a heavy burden on the operator. Further, in order to smoothly perform the attaching / detaching work, a high level skill is required for the worker. In addition, after manufacturing the hose, it is necessary to wash away the release agent attached to the hose.

JP-A-5-169557

  In this regard, Patent Document 1 discloses a method of manufacturing a bent pipe hose that does not require a mandrel. The bent tube hose manufacturing method described in the document includes a hose body manufacturing process, a pressure introducing process, and a forming process.

  In the hose body manufacturing step, a vulcanized hose body formed by laminating an inner surface resin layer, an intermediate rubber layer, a reinforcing layer, and an outer surface rubber layer is manufactured. In the pressure introduction process, the tip of the hose body is sealed, and pressure is introduced into the hose body from the rear end of the hose body. In the molding step, a predetermined bent shape is imparted to the hose body by sandwiching it with a mold while heating the hose body. According to the bent tube hose manufacturing method described in this document, a mandrel is unnecessary.

  However, according to the method of manufacturing a bent tube hose described in the same document, it is necessary to manufacture a mold for only types of hoses having different bending shapes. That is, the same mold cannot be used for a plurality of types of hoses having different bending shapes. That is, it is necessary to produce a die dedicated to the hose. For this reason, the versatility with respect to the kind of hose is low. Moreover, in order to improve productivity, many hoses are vulcanized at the same time, so a large amount of molds are required. Then, the curved pipe hose manufacturing method and hose of this invention aim at providing the curved pipe hose manufacturing method and hose with high versatility with respect to the kind of hose.

  (1) In order to solve the above-described problem, a method for producing a bent pipe hose according to the present invention includes a shape retention layer having a shape retention material made of a shape retention resin, and an unvulcanized rubber base layer. A hose precursor preparation step for producing a body, and a bending shape applying step for fixing a predetermined bending shape to the shape-retaining layer by bending the hose precursor and imparting a predetermined bending shape to the hose precursor; And vulcanizing the base layer by heating the hose precursor to produce a hose.

  The bent tube hose manufacturing method of the present invention includes a hose precursor preparation step, a bending shape imparting step, and a vulcanization step. In the hose precursor preparation step, a hose precursor including a shape maintaining layer and a base layer is prepared. The base layer is made of unvulcanized rubber. In the bending shape imparting step, the hose precursor is deformed into a predetermined bending shape. Here, the shape retention layer has a shape retention material made of shape retention resin. For this reason, the bending shape given to the shape retention layer is held as it is even after the load given to bend the hose precursor is unloaded. That is, the bending shape given to the shape retention layer is fixed. For this reason, the bending shape provided to the hose precursor is maintained. In the vulcanization step, the hose precursor is heated to vulcanize the base layer to produce a hose.

  According to the bent tube hose manufacturing method of the present invention, a mandrel is unnecessary. For this reason, the attachment / detachment operation | work of the hose with respect to a mandrel is unnecessary. Therefore, the burden on the operator is small. In addition, when the hose is manufactured, high skill is not required for the worker. Moreover, it is not necessary to wash away the release agent adhering to the hose after manufacturing the hose.

  In addition, according to the method for producing a bent pipe hose of the present invention, the shape retention layer, that is, the hose precursor, has a high degree of freedom in setting the shape. For this reason, a common hose precursor can be used for a plurality of types of hoses having different bending shapes. Therefore, for example, compared to the case of using a hose precursor having a shape retention layer made of a shape memory alloy or shape memory resin (that is, a shape retention layer capable of reproducing only a single shape), it is more versatile for the type of hose. Is expensive.

  Further, in the bending shape imparting step, the bending shape can be easily imparted to the hose precursor by the property of the shape retaining layer (the property that the given shape can be retained even after unloading).

  In addition, the hose precursor includes a shape retention layer. For this reason, the hose precursor itself has a shape maintaining function. Therefore, the number of molds can be reduced.

  (1-1) Preferably, in the configuration of (1), the base layer includes an inner layer disposed on a radially inner side of the shape retaining layer, and an outer layer disposed on a radially outer side of the shape retaining layer; In the hose precursor manufacturing step, the inner layer is first extruded, and then the shape retaining layer is laminated on the outer peripheral surface of the inner layer, and then the outer layer is extruded on the outer peripheral surface of the shape retaining layer; Better to do. According to this configuration, the shape retention layer can be easily embedded between the inner layer and the outer layer.

  (2) Preferably, in the configuration of (1) above, the shape-retaining resin is preferably a super-stretched polyethylene. According to this configuration, the manufacturing cost of the shape maintaining material can be reduced. In addition, using commercially available ultra-stretched polyethylene products (for example, Forte (registered trademark) manufactured by Sekisui Molding Industry Co., Ltd., Techno Roto (registered trademark) of Mitsui Chemicals, Inc., shape retaining resin sleeve of Hagitec Co., Ltd.), A shape-retaining material can be produced.

  (3) Preferably, in the configuration of (1) or (2), the shape retaining material is a shape retaining fiber made of the shape retaining resin, and the shape retaining layer has a net shape having the shape retaining fiber. It is better to have the composition presented.

  In the bending shape imparting step, a tensile load is likely to act on a portion outside the radius of curvature of the shape-retaining layer in an arbitrary curved portion of the hose precursor. On the other hand, a compressive load is likely to act on the portion inside the radius of curvature of the shape retention layer.

  In this regard, according to the present configuration, the shape maintaining layer has a net shape. For this reason, even when a tensile load or a compressive load acts on the shape retention layer, the load can be dispersed by the deformation of the mesh portion. Accordingly, the deformation resistance when the bent shape is imparted to the hose precursor is reduced.

  Moreover, in an arbitrary curved portion of the hose precursor, a tensile load is likely to act on a portion outside the radius of curvature of the shape retention layer. For this reason, the shape retention layer, that is, the portion outside the radius of curvature of the hose precursor is easily crushed inside the radius of curvature.

  In this regard, according to the present configuration, the shape maintaining layer has a net shape. For this reason, even if a tensile load acts on the shape retention layer, the load can be dispersed by the deformation of the mesh portion. Therefore, the shape retention layer, that is, the portion outside the radius of curvature of the hose precursor can be prevented from being crushed inside the radius of curvature.

  (4) Preferably, in the configuration of the above (3), the shape retention layer should have a configuration of reinforcing fibers that reinforce the hose. According to this configuration, the shape retaining layer has a net shape having shape retaining fibers and reinforcing fibers. At the time of manufacturing the hose, a predetermined bent shape can be imparted to the hose by the shape-retaining fiber. When the hose is used, the hose can be reinforced by the reinforcing fiber (for example, the pressure resistance of the hose can be ensured). Thus, according to the present configuration, a single shape-retaining layer can have both a shape-giving function and a reinforcing function.

  (5) Preferably, in the configuration according to any one of (1) to (4), the hose precursor is predetermined on the hose at least one of a radially outer side and a radially inner side of the shape retaining layer. It is better to have a configuration that includes a functional layer that imparts a function.

  According to this configuration, the hose precursor includes the functional layer independently of the shape maintaining layer. For this reason, the shape imparting function can be carried on the shape retaining layer. In addition, a predetermined function (for example, a hose reinforcement function, a barrier function against gas or liquid, etc.) can be carried on the functional layer.

  (6) Preferably, in the configuration of the above (5), the functional layer may be a reinforcing layer having a net shape having reinforcing fibers that reinforce the hose. According to this configuration, the shape imparting function can be carried on the shape retaining layer. In addition, the reinforcing function of the hose can be carried on the reinforcing layer.

  (7) Preferably, in the configuration according to any one of the above (1) to (6), in the bending shape imparting step, the hose precursor is partially brought into contact with the hose precursor to thereby form the hose precursor. It is better to have a configuration in which a predetermined bending shape is imparted to.

  According to this configuration, in the bending shape imparting step, once the bending die is brought into contact with the hose precursor, the bending shape of the hose precursor can be maintained even if the bending die is removed from the hose precursor. it can. For this reason, it is not necessary to make the bending die contact the hose precursor in the vulcanization step. Therefore, for example, in a bending shape imparting step, after a bending shape is imparted to a plurality of hose precursors using a common bending mold, the plurality of hose precursors imparted with a bending shape are collectively added. A sulfurization step can be performed. Further, the cost required for the bending die can be reduced as compared with the case where the bending die is individually required for all the hose precursors.

  (8) Preferably, in the configuration of any one of the above (1) to (7), in the hose precursor preparation step, a flexible core may be inserted into the hose precursor. .

  According to this structure, in a bending shape provision process, it can suppress that the part outside a curvature radius of a shape maintenance layer, ie, a hose precursor, is crushed inside a curvature radius. Further, the center core has flexibility. For this reason, in the bending shape provision process, when giving a bending shape to a hose precursor, there is little possibility that the rigidity of a center core becomes obstructive. Moreover, since the core has flexibility, the core can be easily extracted from the hose after the vulcanization step.

  (9) Moreover, in order to solve the said subject, the hose of this invention is equipped with the shape maintenance layer which has the shape maintenance material made from shape maintenance resin, and the base layer made from rubber | gum, and has a predetermined bending shape. Features. The hose of the present invention includes a shape retention layer. For this reason, a predetermined bending shape can be easily given at the time of hose manufacture.

  (10) Preferably, in the configuration of the above (9), the shape-retaining resin is preferably a super stretched polyethylene. According to this configuration, the manufacturing cost of the shape maintaining material can be reduced as in the configuration of (2) above. In addition, using commercially available ultra-stretched polyethylene products (for example, Forte (registered trademark) manufactured by Sekisui Molding Industry Co., Ltd., Techno Roto (registered trademark) of Mitsui Chemicals, Inc., shape retaining resin sleeve of Hagitec Co., Ltd.), A shape-retaining material can be produced.

  (11) Preferably, in the configuration of (9) or (10), the shape retaining material is a shape retaining fiber made of the shape retaining resin, and the shape retaining layer has a net shape having the shape retaining fiber. It is better to have the composition presented. According to this configuration, as in the configuration of (3) above, when a bending shape is applied to the hose precursor, the mesh portion is deformed even when a tensile load or a compressive load acts on the shape retention layer. Thus, the load can be dispersed. Accordingly, the deformation resistance when the bent shape is imparted to the hose precursor is reduced. Moreover, according to this structure, it can suppress that the part on the outer side of a curvature radius of a shape maintenance layer, ie, a hose precursor, is crushed inside a curvature radius.

  (12) Preferably, in the configuration of the above (11), the shape retention layer may have a reinforcing fiber that reinforces the hose. According to this configuration, similarly to the configuration of (4) above, a single shape-retaining layer can have both a shape imparting function and a reinforcing function.

  (13) Preferably, in any one of the configurations (9) to (12) above, a configuration in which a functional layer carrying a predetermined function is provided on at least one of the radially outer side and the radially inner side of the shape retaining layer. Is better.

  According to this configuration, as in the configuration of (5) above, the shape-retaining function can be carried on the shape-retaining layer. In addition, a predetermined function (for example, a hose reinforcement function, a barrier function against gas or liquid, etc.) can be carried on the functional layer.

  (14) Preferably, in the configuration of the above (13), the functional layer is a reinforcement layer having a net shape having reinforcing fibers. According to this configuration, the shape-retaining function can be carried on the shape-retaining layer, similarly to the configuration (6). In addition, the reinforcing function can be carried on the reinforcing layer.

  ADVANTAGE OF THE INVENTION According to this invention, the bending pipe hose manufacturing method and hose with the high versatility with respect to the kind of hose can be provided.

It is an axial sectional view of the hose of the first embodiment. It is the II-II direction sectional drawing of FIG. It is a schematic diagram (the 1) of the hose precursor preparation process of the curved pipe hose manufacturing method of this embodiment. It is a schematic diagram (the 2) of the same hose precursor preparation process. It is a schematic diagram of the bending shape provision process of the bent pipe hose manufacturing method. It is a schematic diagram (the 1) of the vulcanization process of the bent pipe hose manufacturing method. It is an expanded sectional view in the frame VII of FIG. It is a schematic diagram at the time of extracting a tube from a hose. It is radial direction sectional drawing of the hose of 2nd embodiment. It is radial direction sectional drawing of the hose of other embodiment (the 1). It is an axial sectional view of the hose of other embodiments (the 2).

  Embodiments of the bent tube hose manufacturing method and the hose of the present invention will be described below.

<First embodiment>
First, the structure of the hose of this embodiment is demonstrated. FIG. 1 is a sectional view in the axial direction of the hose of the present embodiment. FIG. 2 shows a cross-sectional view in the II-II direction of FIG. As shown in FIGS. 1 and 2, the hose 2 has a cylindrical shape. The hose 2 is given a predetermined bent shape by a bent tube hose manufacturing method described later. That is, the hose 2 includes six curved portions 20.

  Structurally, the hose 2 includes a shape retaining layer 21 and a base layer 22. The base layer 22 includes an inner layer 220 and an outer layer 221. The inner layer 220 and the outer layer 221 are each made of EPDM (ethylene-propylene rubber). The inner layer 220 and the outer layer 221 each have a cylindrical shape. The outer layer 221 is disposed on the radially outer side of the inner layer 220. The shape retention layer 21 has a cylindrical shape. The shape retaining layer 21 is interposed between the inner layer 220 and the outer layer 221. As shown in FIG. 2, the shape retaining layer 21 has a net shape in which shape retaining fibers 210 and reinforcing fibers 211 are knitted. The shape retaining fiber 210 is made of ultra-stretched polyethylene. The reinforcing fiber 211 is made of polyamide 66.

  Next, the bent tube hose manufacturing method of this embodiment will be described. The bent pipe hose manufacturing method of this embodiment has a hose precursor preparation process, a bending shape provision process, and a vulcanization process.

[Hose precursor manufacturing process]
In FIG. 3, the schematic diagram (the 1) of the hose precursor preparation process of the curved pipe hose manufacturing method of this embodiment is shown. In FIG. 4, the schematic diagram (the 2) of the hose precursor preparation process is shown. As shown in FIGS. 3 and 4, the hose precursor 2 a and the tube 41 are used in this step. The tube 41 is included in the concept of “center” of the present invention.

  The hose precursor 2a has a straight tubular shape. The hose precursor 2a includes a shape retaining layer 21 and a base layer 22a. The base layer 22a includes an inner layer 220a and an outer layer 221a. The inner layer 220a and the outer layer 221a are each made of unvulcanized EPDM. The inner layer 220a (unvulcanized) corresponds to the inner layer 220 (vulcanized) of the hose 2 in FIG. 1, and the outer layer 221a (unvulcanized) corresponds to the outer layer 221 (vulcanized) of the hose 2 in FIG. Yes.

  The tube 41 is made of fluororubber and has a straight tubular shape. The outer diameter of the tube 41 is smaller than the inner diameter of the hose precursor 2a. The tube 41 is flexible. The tube 41 has a lower bending rigidity than the hose precursor 2a. Moreover, the tube 41 has a smaller coefficient of friction than the hose precursor 2a.

  In this step, first, the hose precursor 2a is produced. That is, first, a continuous body of the inner layer 220a is produced by extrusion molding. Next, the continuous body of the shape retention layer 21 is laminated on the outer peripheral surface of the continuous body of the inner layer 220a. Specifically, the shape-retaining fiber 210 and the reinforcing fiber 211 shown in FIG. 2 are wound around the outer peripheral surface of the continuous body of the inner layer 220a while being entangled. Then, a continuous body of the outer layer 221a is laminated on the outer peripheral surface of the continuous body of the shape retaining layer 21 by extrusion molding. In this way, a continuous body of the hose precursor 2a is produced. Finally, the hose precursor 2a shown in FIG. 3 is completed by cutting the continuous body with a predetermined length.

  Next, as shown in FIGS. 3 and 4, a tube 41 is inserted inside the hose precursor 2a in the radial direction. Since the tube 41 has a small friction coefficient, the insertion load is small. Therefore, the insertion work is simple. Further, scratches or the like are hardly formed on the inner peripheral surface of the hose precursor 2a.

  By this step, as shown in FIG. 4, the laminate 6 is produced. The laminate 6 includes a tube 41 and a hose precursor 2a (inner layer 220a, shape retaining layer 21, outer layer 221a) from the radially inner side toward the radially outer side.

[Bending shape application process]
In FIG. 5, the schematic diagram of the bending shape provision process of the curved pipe hose manufacturing method of this embodiment is shown. As shown in FIG. 5, in this step, the laminate 6 produced in the hose precursor production step and the six bending dies 92 are used.

  The six bending dies 92 are used to give the hose precursor 2a the bent shape of the hose 2 shown in FIG. The six bending dies 92 are arranged at positions corresponding to the inside of the radius of curvature of the six curved portions 20 of the hose 2 shown in FIG.

  In this step, the stacked body 6 is disposed along the six bending dies 92. Six laminated portions 60 are formed in the laminate 6. Further, the hose precursor 2a is given a bent shape similar to the hose 2 shown in FIG.

  By this step, the shape maintaining layer 21 is plastically bent and deformed. In other words, the shape retaining layer 21 once provided with the bent shape continues to hold the bent shape after the laminate 6 is removed from the six bending dies 92. Here, the bending rigidity of the shape retention layer 21 is larger than the total bending rigidity of the tube 41 and the base layer 22a. For this reason, the laminated body 6 continues to hold the bent shape imparted by this step even after being removed from the six bending dies 92.

[Vulcanization process]
In FIG. 6, the schematic diagram (the 1) of the vulcanization | cure process of the curved pipe hose manufacturing method of this embodiment is shown. FIG. 7 shows an enlarged view in the frame VII of FIG. As shown in FIG. 6, in this process, the laminated body 6, the base 90, and the hose attachment member 91 to which the bending shape was provided in the bending shape applying process are used. These members are arranged inside a vulcanizing can (not shown).

  As shown in FIG. 7, the hose attachment member 91 includes a large diameter portion 910 and a small diameter portion 911. The large diameter portion 910 has a disk shape. The large diameter portion 910 is disposed on the upper surface of the base 90. The small diameter portion 911 has a short-axis cylindrical shape. The small diameter portion 911 protrudes from the upper surface of the large diameter portion 910. The lower end (one axial end) of the tube 41 of the laminate 6 is disposed on the upper surface of the small diameter portion 911. The lower end of the hose precursor 2a is fitted on the outer peripheral surface of the small diameter portion 911.

  In this step, the hose precursor 2a is heated from the outside in the radial direction. Specifically, hold at 150 ° C. for 30 minutes. By this process, the hose precursor 2a is vulcanized, and the hose 2 having a predetermined bent shape is produced. That is, the hose 2 including the six curved portions 20 corresponding to the six curved portions 60 of the laminate 6 is produced.

  FIG. 8 shows a schematic diagram when the tube is extracted from the hose. As shown in FIG. 8, finally, the tube 41 is extracted from the completed hose 2. Here, the tube 41 is flexible and has a bending rigidity smaller than that of the hose 2. Moreover, the tube 41 has a small friction coefficient. For this reason, the extraction load is small. Therefore, the extraction work is simple. In this way, the hose 2 having a predetermined bent shape is manufactured by the bent tube hose manufacturing method of the present embodiment.

[Function and effect]
Next, the bent tube hose manufacturing method of this embodiment and the effect of a hose are demonstrated. According to the bent tube hose manufacturing method and the hose 2 of the present embodiment, the operation of attaching and detaching the hose 2 to and from the mandrel is unnecessary. For this reason, an operator's burden is small. In addition, when the hose is manufactured, high skill is not required for the worker. Moreover, it is not necessary to wash away the release agent adhering to the hose after manufacturing the hose.

  Moreover, according to the curved pipe hose manufacturing method and hose 2 of this embodiment, the shape retention layer 21, that is, the hose precursor 2a, has a high degree of freedom in shape setting. For this reason, the common hose precursor 2a can be used for a plurality of types of hoses 2 having different bending shapes. Therefore, compared with the case where the hose precursor 2a having the shape retention layer 21 made of shape memory alloy or shape memory resin (that is, the shape retention layer 21 capable of reproducing only a single shape) is used, for example, High versatility for types.

  Further, in the bending shape imparting step, the bending shape can be easily imparted to the hose precursor 2a by the property of the shape retaining layer 21 (the property that the given shape can be retained even after unloading).

  Further, according to the bent tube hose manufacturing method and the hose 2 of the present embodiment, as shown in FIGS. 2 and 3, first, the inner layer 220a is extruded, and then the shape retaining fiber 210 and the reinforcement are formed on the outer peripheral surface of the inner layer 220a. The hose precursor 2 a is produced by winding the fibers 211 to form the shape retaining layer 21 and then extruding the outer layer 221 on the outer peripheral surface of the shape retaining layer 21. For this reason, the shape retention layer 21 can be easily embedded between the inner layer 220 and the outer layer 221.

  Further, according to the bent tube hose manufacturing method and the hose 2 of the present embodiment, the shape-retaining fiber 210 is made of ultra-stretched polyethylene. For this reason, the manufacturing cost of the shape retention fiber 210 can be reduced.

  Moreover, as shown in FIG. 2, the shape-retaining layer 21 has a net shape. For this reason, even when a tensile load or a compressive load acts on the shape retaining layer 21, the load can be dispersed by the deformation of the mesh portion. Therefore, the deformation resistance when the bent shape is imparted to the hose precursor 2a is reduced. Moreover, it can suppress that the part on the curvature-radius outer side of the shape maintenance layer 21, ie, the hose precursor 2a, is crushed inside a curvature-radius.

  As shown in FIG. 2, the shape retaining layer 21 has a net shape having shape retaining fibers 210 and reinforcing fibers 211. In the bending shape imparting step, a predetermined bending shape can be imparted to the hose precursor 2a by the shape-retaining fiber 210. On the other hand, when the hose 2 is used, the hose 2 can be reinforced by the reinforcing fibers 211. Thus, according to the bent tube hose manufacturing method and the hose 2 of the present embodiment, the single shape retaining layer 21 can have both the shape imparting function and the reinforcing function.

  Further, according to the bent pipe hose manufacturing method and the hose 2 of the present embodiment, as shown in FIG. 5, after the six bending dies 92 are once brought into contact with the hose precursor 2a in the bending shape applying step, Even if the six bending dies 92 are removed from the hose precursor 2a, the bent shape of the hose precursor 2a can be maintained. For this reason, it is not necessary to abut the six bending dies 92 on the hose precursor 2a in the vulcanization step. Therefore, for example, in the bending shape imparting step, after giving the bending shape to the plurality of hose precursors 2a using the common six bending dies 92, the plurality of hose precursors 2a to which the bending shape is imparted are applied. Thus, the vulcanization process can be performed collectively. Therefore, the manufacturing time of the hose 2 can be shortened. Further, the cost required for the bending die 92 can be reduced as compared with the case where the bending die 92 is individually required for all the hose precursors 2a.

  Further, according to the bent tube hose manufacturing method and the hose 2 of the present embodiment, as shown in FIGS. 3 and 4, the tube 41 is inserted into the hose precursor 2 a in the hose precursor manufacturing step. For this reason, in the bending shape provision process, it can suppress that the part of the shape maintenance layer 21, ie, the curvature radius outer side of the hose precursor 2a, is crushed inside the curvature radius. Moreover, the tube 41 has flexibility. For this reason, in the bending shape provision process, when giving a bending shape to the hose precursor 2a, there is little possibility that the rigidity of the tube 41 becomes obstructive. Moreover, since the tube 41 has flexibility, as shown in FIG. 8, the tube 41 can be easily extracted from the hose 2 after the vulcanization step.

<Second embodiment>
The difference between the bent tube hose manufacturing method and hose of the present embodiment and the bent tube hose manufacturing method and hose of the first embodiment is that the hose includes a reinforcing layer. Here, only the differences will be mainly described.

  In FIG. 9, radial direction sectional drawing of the hose of this embodiment is shown. In addition, about the site | part corresponding to FIG. 2, it shows with the same code | symbol. As shown in FIG. 9, the hose 2 includes a shape retaining layer 21, a base layer 22, and a reinforcing layer 23. The base layer 22 includes an inner layer 220 and an outer layer 221. In the vicinity of the boundary between the inner layer 220 and the outer layer 221, the shape retaining layer 21 is disposed on the radially inner side, and the reinforcing layer 23 is disposed on the radially outer side. The shape retaining layer 21 has a net shape in which the shape retaining fibers 210 are knitted. The shape retaining fiber 210 is made of ultra-stretched polyethylene. The reinforcing layer 23 has a net shape in which reinforcing fibers 231 are knitted. The reinforcing fiber 231 is made of polyamide 66.

  In the hose precursor production process of the bent pipe hose manufacturing method of the present embodiment, first, a continuous body of unvulcanized material of the inner layer 220 is produced by extrusion molding. Next, the continuous body of the shape retention layer 21 is laminated on the outer peripheral surface of the continuous body of the unvulcanized material of the inner layer 220. Specifically, the shape-retaining fibers 210 are wound around the outer peripheral surface of the continuous body of the unvulcanized material of the inner layer 220 while being entangled. Subsequently, the continuous body of the reinforcing layer 23 is laminated on the outer peripheral surface of the continuous body of the shape retaining layer 21. Specifically, the reinforcing fiber 231 is wound around the outer peripheral surface of the continuous body of the shape retention layer 21 while being entangled. Then, a continuous body of the unvulcanized material of the outer layer 221 is laminated on the outer peripheral surface of the continuous body of the reinforcing layer 23 by extrusion molding. In this way, a continuous body of hose precursors is produced. Finally, the hose precursor is completed by cutting the continuous body with a predetermined length. In addition, a bending shape provision process and a vulcanization | cure process are the same as that of the bent tube hose manufacturing method of 1st embodiment.

  The bent tube hose manufacturing method and hose of the present embodiment and the bent tube hose manufacturing method and hose of the first embodiment have the same functions and effects with respect to parts having the same configuration. Further, according to the bent tube hose manufacturing method and the hose 2 of the present embodiment, as shown in FIG. 9, the hose 2 includes a shape retaining layer 21 and a reinforcing layer 23 separately. For this reason, the shape imparting function can be carried on the shape retaining layer 21. In addition, the reinforcing function of the hose 2 can be carried on the reinforcing layer 23.

<Others>
In the above, the bending pipe hose manufacturing method and hose embodiment of this invention were demonstrated. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  In FIG. 10, radial direction sectional drawing of the hose of other embodiment (the 1) is shown. In addition, about the site | part corresponding to FIG. 2, it shows with the same code | symbol. As shown in FIG. 10, the shape retaining layer 21 may be cylindrical. Further, a cylindrical barrier layer 24 having fuel permeation resistance may be disposed as a functional layer on the radially outer side (of course, the radially inner side) of the shape retaining layer 21. Further, the base layer 22 including the inner layer 220, the outer layer 221, and the intermediate layer 222 may be disposed.

  The material of the shape retaining material is not particularly limited. Shape retention using commercially available ultra-stretched polyethylene products (for example, Forte (registered trademark) manufactured by Sekisui Molding Industry Co., Ltd., Technoroto (registered trademark) manufactured by Mitsui Chemicals, Inc., shape retaining resin sleeve manufactured by Hagitec Corporation, etc.) A material may be produced. Moreover, the shape of the shape retaining material is not particularly limited. It may be a columnar shape, a cylindrical shape, a wire shape, a net shape, a cloth shape, a belt shape, or the like.

  In FIG. 11, the axial direction sectional drawing of the hose of other embodiment (the 2) is shown. In addition, about the site | part corresponding to FIG. 1, it shows with the same code | symbol. As shown in FIG. 11, a plurality of shape retaining layers 21 may be locally disposed only in a portion corresponding to the curved portion 20 of the hose 2. In other words, the shape retaining layer 21 may not be disposed over the entire axial length of the hose 2.

  The material of the tube 41 is not particularly limited. It is sufficient that the bending rigidity is smaller than that of the hose precursor 2a. For example, FKM (vinylidene fluoride), FEPM (tetrafluoroethylene-propylene), FFKM (tetrafluoroethylene-perfluorovinyl ether), or the like can be used.

  The material of the base layer 22 is not particularly limited. For example, EPDM (ethylene / propylene rubber), ECO (epichlorohydrin rubber), NBR (nitrile rubber), a copolymer of NBR and PVC (polyvinyl chloride), FKM, CR (chloroprene rubber), or the like can be used.

  Moreover, when the setting number of the curved part 20 of the hose 2 shown in FIG. 1 is small, or when the curvature of the curved part 20 is small (a curvature radius is large), the tube 41 does not need to be arrange | positioned.

  Further, the vulcanization process of the bent tube hose manufacturing method of the above embodiment may be executed separately in a primary vulcanization process and a secondary vulcanization process. That is, in the primary vulcanization step, vulcanization (semi-vulcanization) of the hose precursor 2a is performed at a primary vulcanization temperature (for example, 150 ° C. at which sulfur reacts) for a predetermined time (for example, 3 minutes). The vulcanization may be performed at a secondary vulcanization temperature (for example, 130 ° C.) lower than the primary vulcanization temperature.

  Moreover, the use of the hose 2 is not particularly limited. For example, it can be used as an automobile fuel hose, radiator hose, heater hose, air conditioner hose, brake hose, clutch hose, and the like.

2: hose, 2a: hose precursor, 20: curved portion, 21: shape-retaining layer, 210: shape-retaining fiber, 211: reinforcing fiber, 22: base layer, 220: inner layer, 221: outer layer, 222: intermediate layer, 22a : Base layer, 220a: inner layer, 221a: outer layer, 23: reinforcing layer, 231: reinforcing fiber, 24: barrier layer.
41: Tube (medium core).
6: Laminated body, 60: curved part.
90: base, 91: hose attachment member, 910: large diameter portion, 911: small diameter portion, 92: bending die.

Claims (14)

A hose precursor production step of producing a hose precursor comprising a shape retention layer having a shape retention material made of a shape retention resin, and an unvulcanized rubber base layer;
Bending the hose precursor to fix a predetermined bending shape to the shape-retaining layer, and imparting a predetermined bending shape to the hose precursor; and
Vulcanizing the base layer by heating the hose precursor to produce a hose; and
A method of manufacturing a bent pipe hose.   The bent pipe hose manufacturing method according to claim 1, wherein the shape-retaining resin is ultra-stretched polyethylene. The shape holding material is a shape holding fiber made of the shape holding resin,
The bent pipe hose manufacturing method according to claim 1, wherein the shape retention layer has a net shape having the shape retention fibers.   The bent pipe hose manufacturing method according to claim 3, wherein the shape maintaining layer has reinforcing fibers that reinforce the hose.   The said hose precursor is provided with the functional layer which provides a predetermined function to the said hose in at least one among the radial direction outer side and radial direction inner side of the said shape maintenance layer. Bent tube hose manufacturing method.   The bent pipe hose manufacturing method according to claim 5, wherein the functional layer is a reinforcing layer having a net shape having reinforcing fibers for reinforcing the hose.   The said bending shape provision process WHEREIN: The predetermined | prescribed bending shape is provided to this hose precursor by making a bending type | mold partly contact | abut to the said hose precursor. Bent tube hose manufacturing method.   The bent pipe hose manufacturing method according to any one of claims 1 to 7, wherein a flexible core is inserted into the hose precursor in the hose precursor preparation step.   A hose comprising a shape-retaining layer having a shape-retaining resin-made shape-retaining material and a rubber base layer, and having a predetermined bent shape.   The hose according to claim 9, wherein the shape retention resin is ultra-stretched polyethylene. The shape holding material is a shape holding fiber made of the shape holding resin,
The hose according to claim 9 or 10, wherein the shape retention layer has a net shape having the shape retention fibers.   The hose according to claim 11, wherein the shape retention layer has reinforcing fibers that reinforce the hose.   The hose according to any one of claims 9 to 12, further comprising a functional layer carrying a predetermined function on at least one of a radially outer side and a radially inner side of the shape maintaining layer.   The hose according to claim 13, wherein the functional layer is a reinforcing layer having a net shape having reinforcing fibers.

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