JP3433815B2 - Hose manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hose, and more particularly, to a hose whose diameter can be changed by a pressurized fluid in a center hole of a molded body during extrusion molding. And a method for producing the same. 2. Description of the Related Art For example, a method of manufacturing a reinforced hose disclosed in Japanese Patent Application Laid-Open No. 58-14723 is known. This manufacturing method is a method in which a reinforcing rubber hose having a reinforcing yarn layer is integrally manufactured by extruding an inner tube rubber, winding a reinforcing yarn on the inner tube surface, and immediately extruding the outer tube rubber on the surface. is there. In the above-described method for manufacturing a two-layer rubber hose, the inner diameter of the inner tube rubber layer, that is, the diameter of the center hole is determined by the diameter of the center die, and the outer diameter of the inner tube rubber layer is determined. That is, the thickness of the inner tube rubber layer is determined by the inner diameter of the inner tube die. The outer diameter of the outer tube rubber layer is determined by the inner diameter of the outer tube die. Therefore, when manufacturing multiple layers of rubber hoses having different inner diameters (diameters of center holes) and outer diameters, it is necessary to replace the center dies and the outer tube dies with predetermined diameters, respectively. In some cases, it is necessary to replace the inner tube dies in accordance with the replacement. [0004] However, in the manufacturing apparatus disclosed in the above publication, a spinner for winding the reinforcing yarn and a bobbin carrier are arranged near each die, so that the vicinity of the die has a complicated structure. Therefore, it takes 30 to 60 minutes to replace each die, requiring an extremely large number of man-hours, which is not suitable for high-mix low-volume production. The present invention has been made in view of such circumstances, and has as its object to change the diameter of a hose manufactured without the need to replace a die. Means for Solving the Problems A method for manufacturing a hose according to the present invention, which solves the above problems, comprises an inner tube extruder, a spiral device,
And an outer tube extrusion device are provided adjacent to each other.
Extruding the inner tube rubber material from the
Wind the reinforcing yarn around the inner tube surface with an
By extruding the outer tube rubber material from the outer tube extrusion device to the surface
Apparatus for integrally manufacturing a reinforced rubber hose with a reinforcing yarn layer
The inner pipe rubber material is extruded to form an inner pipe, and at the same time, a pressurized fluid is supplied into the center hole of the inner pipe to expand the inner pipe. A winding step of winding a reinforcing yarn around the outer peripheral surface of the inner tube having a diameter, and a winding step .
Immediately after this, the outer pipe extrusion step of extruding the outer pipe rubber material on the outer peripheral surface of the inner pipe on which the reinforcing yarn is wound to form the outer pipe, and the vulcanizing step of vulcanizing the inner pipe and the outer pipe, in this order. It is characterized by performing. Both a liquid and a gas are used as the pressurized fluid, but it is generally preferable to use pressurized air.
In order to maximize the effect of the pressurized fluid, the end of the extruded molded body can be closed.However, in the case where the center hole diameter is small to some extent and the length of the molded body in the initial stage of molding is short. Otherwise, the effect of the pressurized fluid can be obtained without blocking. According to the production method of the present invention, when the molding material is extruded into a hose shape having a center hole, a pressurized fluid is injected into the center hole while the molded body maintains a plasticized state. Supplied. Then, the formed body expands to a diameter corresponding to the pressure of the pressurized fluid, and the desired inner diameter and outer diameter can be obtained by adjusting the pressure of the pressurized fluid. Hereinafter, the present invention will be described specifically with reference to examples. FIG.
FIG. 1 shows an apparatus for manufacturing a hose used in one embodiment of the present invention.
This manufacturing apparatus includes an inner pipe extruder 1 and a center die 2
, Inner tube die 3, intermediate die 4, outer tube die 5
, An outer tube pushing device 6 and a spiral device 7. An extrusion head 11 is fixed to the tip of an extrusion barrel 10 of the inner tube extruder 1, and an extrusion screw 12 is rotatably arranged in the extrusion barrel 10. The center die 2 and the inner tube die 3 are fixed to the extrusion head 11. The center die 2 is fixed to the extrusion head 11 via the inner tube die 3. Further, as shown in FIG. 2 in an enlarged manner, an air passage 20 opening at the tip is provided therein. This air passage 20 is formed in the inner pipe die 3.
And it is led out through the extrusion head 11, and the other end is connected to the pressurized air supply source 21. The inner tube die 3 has a substantially cylindrical shape having a truncated conical appearance, and is fixed to the extrusion head 11. The intermediate die 4 and the outer tube die 5 are held by an outer tube extrusion device 6, respectively. The outer tube extrusion device 6 has an extrusion head 60, and the intermediate die 4 and the outer tube die 5 have a die holder 6
1 and 62 are fixed to the extrusion head 60. A material outlet 45 formed outside the center die 2 and formed by the intermediate die 4 and the outer tube die 5 is located slightly forward of the tip of the center die 2. The spiral device 7 includes at least a pair of bobbin carriers (not shown) that rotate in opposite directions, a drive arm 70 erected from the bobbin carrier, and the drive arm 70 via a shaft 71 and a spinner arm 72. A pair of spinners 73 that are connected to form a truncated cone
And a bobbin 74 held by a bobbin carrier. The pair of spinners 73 are supported by the extrusion head 11 of the inner tube extrusion device 1 and the extrusion head 60 of the outer tube extrusion device 6 via a bearing 75. In the yarn hole of the spinner 73, a reinforcing yarn F derived from the bobbin 74 is provided.
₁ and F ₂ are respectively passed through, and are led out from the gap between the inner tube die 3 and the intermediate die 4 to the surface of the inner tube 8 immediately after extrusion. A method for manufacturing the reinforced rubber hose of this embodiment using the manufacturing apparatus configured as described above will be described. The inner tube material (unvulcanized NBR rubber or unvulcanized EPDM rubber) in the extrusion barrel 10 of the inner tube extruder 1 is extruded from a ring-shaped gap formed by the center die 2 and the inner tube die 3 to form an inner tube. A tube 8 is formed. At this time, the pressurized air supply source 21 is driven, and pressurized air is blown out from the air passage 20 into the center hole of the inner pipe 8. Then, the inner pipe 8 is expanded in diameter according to the pressure of the pressurized air. Next, the bobbin carrier and the spinner 73 are integrally driven to rotate, and the reinforcing yarns F ₁ and F ₂ are wound in opposite directions on the surface of the expanded inner tube 8 to form a reinforcing yarn layer. You. Then, almost simultaneously, the outer tube material (unvulcanized CR rubber or unvulcanized EPDM rubber) in the outer tube extruder 6 is extruded from the material outlet 45 to form the outer tube 9. By performing vulcanization under the same predetermined conditions as in the past, an integrated reinforced rubber hose composed of the inner tube 8, the reinforcing thread layer and the outer tube 9 is manufactured. Incidentally, the inside diameter of the rubber hose manufactured by a conventional method without driving the pressurized air supply source 21 using the above manufacturing apparatus was 8.5 mm, and the outside diameter was 17.5 mm. However, according to the method of the above-described embodiment, when the pressurized air at a pressure of 2.0 kg / cm ² was supplied, the inner diameter was 10.5 mm,
A rubber hose having an outer diameter of 19.0 mm and having an inner diameter and an outer diameter larger than those of a conventional method was produced. According to the manufacturing method of the present invention, it is possible to manufacture various kinds of hoses only by adjusting the pressure of the pressurized fluid and without changing dies. Therefore,
A large number of man-hours due to die exchange can be reduced, and one manufacturing apparatus can be suitably used for both low-mix high-volume production and high-mix low-volume production.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary plan view showing a partial cross section of a manufacturing apparatus used in a manufacturing method according to an embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part of FIG. [Explanation of symbols] 1: Inner tube extrusion device 2: Center die
3: Inner tube die 4: Middle die 5: Outer tube die
6: Outer pipe extrusion device 7: Spiral device 20: Air passage 2
1: Pressurized air supply source

Continuation of the front page (56) References JP-A-58-14723 (JP, A) JP-A-59-186563 (JP, A) JP-A-62-45120 (JP, U) JP-A-55-52828 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 47/00-47/96

Claims (1)

(57) [Claims] [Claim 1] Inner tube extrusion device, spiral device, outer tube pusher
A discharge device is provided adjacent to the inner tube extrusion device.
Extruding the inner material to form an inner tube,
Wrap a reinforcing yarn around the surface of the inner tube with
Reinforcement yarn by extruding outer tube rubber material from tube extrusion device
Uses a device that integrally manufactures a reinforced rubber hose with a layer
An inner pipe extrusion step of extruding the inner pipe rubber material to form the inner pipe, and simultaneously supplying a pressurized fluid into a center hole of the inner pipe to expand the inner pipe; and And a winding step of winding a reinforcing yarn around the outer peripheral surface of the inner pipe having an increased diameter, and the outer pipe is wound on the outer peripheral surface of the inner pipe wound with the reinforcing yarn immediately after the winding step. A method for manufacturing a hose, comprising: performing an outer tube extruding step of extruding a rubber material to form an outer tube; and a vulcanizing step of vulcanizing the inner tube and the outer tube in this order.